Techniques for conveying mobility information

Abstract

Methods, systems, and devices for providing feedback regarding radio link failure (RLF) events, including information regarding directional beams. A user equipment (UE) can experience an RLF event and lose connectivity with a network. After the UE reestablishes a radio resource control (RRC) connection with the network, the UE can transmit an RLF report including information regarding directional beams, information regarding a primary node and a secondary node in a dual connectivity procedure, information associated with a conditional handover procedure, or information regarding a service time interruption, or a combination thereof. One or more base stations can be configured to transmit at least portions of the information in the RLF report to other base stations as part of a message that can be an example of an RLF indication or a handover report. The message can be transmitted on an X2 interface or an Xn interface.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of International Patent Application No. PCT / CN2019 / 074391 filed by Liu et al. on February 1, 2019, entitled “TECHNIQUES FOR COMMUNICATING MOBILITY INFORMATION,” which is assigned to the assignee of this application and is incorporated herein by reference in its entirety.

[0003] introduction

[0004] The following relates generally to wireless communications and, more particularly, to managing mobility information.

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems, which may be referred to as new radio (NR) systems. These systems may employ various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include several base stations or network access nodes, each of which simultaneously supports communication with multiple communication devices, which may be further referred to as user equipment (UE).

[0006] As the UE moves through the coverage area, a handover procedure may be initiated to allow the UE to establish a link with a target cell.It may be desirable to improve handover procedures.

[0007] Overview

[0008] A method of wireless communication is described. The method may include identifying a radio link failure (RLF) event associated with a first radio access technology (RAT); reestablishing a radio resource control (RRC) connection with a cell of a second RAT based on identifying the RLF event associated with the first RAT; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0009] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: identify a RLF event associated with a first RAT; reestablish an RRC connection with a cell of a second RAT based on identifying the RLF event associated with the first RAT; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0010] Another apparatus for wireless communication is described. The apparatus may include means for identifying a RLF event associated with a first RAT; reestablishing an RRC connection with a cell of a second RAT based on identifying the RLF event associated with the first RAT; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0011] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify a RLF event associated with a first RAT; reestablish an RRC connection with a cell of a second RAT based on identifying the RLF event associated with the first RAT; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a beam restoration failure of at least one directional beam associated with the first RAT, wherein identifying the RLF event may be based on identifying the beam restoration failure.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be configured to indicate that the RLF event may be a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0014] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the connection failure type indication in the RLF report can be configured to indicate that the RLF event can be a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a duration of the service interruption based on identifying the RLF event, wherein the RLF report indicates the duration of the service interruption.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the duration may further include operations, features, means, or instructions for identifying a duration between a first time when the UE loses data transmission capability at a source cell of a first RAT and a second time when the UE is able to resume data transmission at the cell, wherein the cell may have a second RAT.

[0017] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying the duration may further include operations, features, means, or instructions for identifying the duration between a first time when the UE receives a handover command from a source cell and a second time when the UE transmits an RRC reconfiguration complete message to the cell.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, when dual connectivity may be configured, the duration may be identified for each of the primary cell and the secondary cell.

[0019] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received powers of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying that the RLF event may be associated with a conditional handover failure, wherein the RLF report includes information about the conditional handover failure.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report includes: a duration between the last handover initialization and the connection failure, a list of candidate target cells including at least the cell, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells to attempt connection to after the RLF event occurred, a number of connection attempts made after the RLF event occurred, or a combination thereof.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: receiving an indication of one or more candidate target cells for conditional handover; and determining that a handover condition may be satisfied for at least one of the one or more candidate target cells, the at least one candidate target cell including the cell. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: initiating a random access channel (RACH) toward at least one candidate target cell that satisfies the handover condition, wherein identifying that the RLF event may be associated with the conditional handover failure may be based on initiating the RACH toward the at least one candidate target cell.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying information about a primary cell and a secondary cell in a dual connectivity configuration, wherein the RLF report includes the identified information.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF event can be for a master cell group (MCG) in a dual connectivity configuration.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying measurements for an MCG and measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, wherein the RLF report includes the measurements.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a reference signal received power (RSRP) of a last serving cell including an MCG and at least one SCG in a dual connectivity configuration, or a reference signal received quality (RSRQ) of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the RLF report includes the RSRP or RSRQ or both for the last serving cell.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying the RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, the RSRQ of the neighboring cell, the frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, wherein the RLF report includes the RSRP, RSRQ, frequency, or identifier of the neighboring cell, or a combination thereof.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a cell radio network temporary identifier (C-RNTI) of a primary base station and at least one secondary base station in a dual connectivity configuration, wherein the RLF report includes the C-RNTIs of the primary base station and the at least one secondary base station.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of each cell of a primary base station or a secondary base station in a dual connectivity configuration that may be associated with the RLF event, wherein the RLF report includes the identifier of each cell that may be associated with the RLF event.

[0030] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, when a last RRC reconfiguration message including mobility control information is received, an identifier of a primary and secondary cell in a dual connectivity configuration, wherein the RLF report includes the identifier.

[0031] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying whether the type of handover may be an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover.

[0032] In some examples of the methods, devices, and non-transitory computer-readable media described herein, reestablishing the RRC connection may further include operations, features, means, or instructions for: transmitting an RRC connection reestablishment request; receiving an RRC connection reestablishment message based on transmitting the RRC connection reestablishment request; and transmitting an RRC connection reestablishment complete message based on receiving the RRC connection reestablishment message.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an RRC message including an indication that one or more RLF reports may be available for reporting to a network, wherein transmitting the RLF report may be based on transmitting the RRC message including the indication.

[0034] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving an information request message based on transmitting the RRC message including the indication, wherein transmitting the RLF report may be based on receiving the information request message.

[0035] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be part of an information response message transmitted based on receiving the information request message.

[0036] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RRC message includes an RRC Connection Reestablishment Complete message.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for performing a handover between the source cell and the cell, wherein identifying the RLF event may be based on performing the handover.

[0038] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: a transmission power of a preamble, a number of attempts to successfully transmit the preamble, a number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, or Layer 1 (L1) RSRP, or a combination thereof.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the preamble may be a RACH preamble.

[0040] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the first RAT may be associated with a 5G core network (5GC) and the second RAT may be associated with an evolved packet core (EPC).

[0041] A wireless communication method is described. The method may include reestablishing an RRC connection with a UE after an RLF event, wherein the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT; and receiving an RLF report from the UE over the RRC connection of the second RAT, the RLF report including information about one or more directional beams associated with the RLF event. The method may further include transmitting a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0042] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: reestablish an RRC connection with a UE after an RLF event, wherein the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT; and receive an RLF report from the UE over the RRC connection of the second RAT, the RLF report including information about one or more directional beams associated with the RLF event. The processor and the memory may be further configured to: transmit a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0043] Another apparatus for wireless communication is described. The apparatus may include means for reestablishing an RRC connection with a UE after an RLF event, wherein the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT; and receiving an RLF report from the UE over the RRC connection of the second RAT, the RLF report including information about one or more directional beams associated with the RLF event. The apparatus may further include means for transmitting a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0044] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: reestablish an RRC connection with a UE after an RLF event, wherein the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT; and receive an RLF report from the UE over the RRC connection of the second RAT, the RLF report including information about one or more directional beams associated with the RLF event. The code may further include instructions executable by the processor to: transmit a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0045] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a source cell associated with a handover of the UE.

[0046] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a core network component, wherein the core network component conveys at least some of the information in the message to a source cell associated with the handover of the UE.

[0047] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the core network component includes at least one component of an EPC.

[0048] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the core network component includes at least one component of a 5GC.

[0049] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first RAT may be associated with a 5GC and a second RAT may be associated with an EPC.

[0050] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: identifying a type of the RLF event; and selecting a type of message to transmit based on the identified type of the RLF event, wherein transmitting the message may be based on the identified type of the RLF event.

[0051] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a RLF indication.

[0052] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a handover report.

[0053] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an Xn interface.

[0054] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an X2 interface.

[0055] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying that the cause of the RLF event may be a beam recovery failure associated with the first RAT, wherein the message indicates that the type of the RLF event includes the beam recovery failure.

[0056] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message includes a connection failure type indication and can be configured to indicate that the RLF event can be a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

[0057] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the connection failure type indication in the RLF report can be configured to indicate that the RLF event can be a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

[0058] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a duration of the service interruption based on receiving the RLF report, wherein the message indicates the duration of the service interruption.

[0059] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0060] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, that the RLF event may be associated with a conditional handover failure, wherein the message includes information about the conditional handover failure.

[0061] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a set of candidate target cells associated with conditional handover, wherein transmitting the message to another cell may be based on transmitting the message to the set of candidate target cells.

[0062] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message includes: a duration between a last handover initialization and a connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

[0063] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an indication of one or more candidate target cells for conditional handover, wherein receiving the RLF report may be based on transmitting the indication of the one or more candidate target cells for the conditional handover.

[0064] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying information about a primary cell and a secondary cell in a dual connectivity configuration based on receiving the RLF report, wherein the message includes the identified information.

[0065] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to an MCG and an SCG in a dual connectivity configuration.

[0066] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF event can be for an MCG in a dual connectivity configuration.

[0067] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying measurements for the MCG and measurements for at least one SCG in the dual connectivity configuration based on receiving the RLF report, wherein the message includes the measurements.

[0068] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, an RSRP of a last serving cell including an MCG and at least one SCG in the dual connectivity configuration, or an RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the message includes the RSRP or RSRQ or both for the last serving cell.

[0069] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, an RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, an RSRQ of the neighboring cell, a frequency of the neighboring cell, an identifier of the neighboring cell, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the message includes the RSRP, RSRQ, frequency, or identifier of the neighboring cell, or a combination thereof.

[0070] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying C-RNTIs of a primary base station and at least one secondary base station in a dual connectivity configuration based on receiving the RLF report, wherein the message includes the C-RNTIs of the primary base station and the at least one secondary base station.

[0071] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of each cell of a primary base station or a secondary base station in a dual connectivity configuration that may be associated with the RLF event based on receiving the RLF report, wherein the message includes an identifier of each cell that may be associated with the RLF event.

[0072] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of a primary and secondary cell in the dual connectivity configuration based on receiving the RLF report when a last RRC reconfiguration message including mobility control information is received, wherein the message includes the identifier.

[0073] In some examples of the methods, devices, and non-transitory computer-readable media described herein, reestablishing the RRC connection may further include operations, features, means, or instructions for: receiving an RRC connection reestablishment request from the UE; transmitting an RRC connection reestablishment message based on receiving the RRC connection reestablishment request; and receiving an RRC connection reestablishment completion message based on transmitting the RRC connection reestablishment message.

[0074] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving an RRC message including an indication that the one or more RLF reports may be available at the UE, wherein receiving the RLF report may be based on receiving the RRC message including the indication.

[0075] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an information request message based on receiving the RRC message including the indication, wherein receiving the RLF report may be based on transmitting the information request message.

[0076] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be part of an information response message received based on transmitting the information request message.

[0077] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RRC message includes an RRC Connection Reestablishment Complete message.

[0078] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting a handover command to the UE, wherein receiving the RLF report may be based on transmitting the handover command.

[0079] A wireless communication method is described. The method may include identifying a Relative Least Connection (RLF) event; reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0080] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: identify a Relay Response (RLF) event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0081] Another apparatus for wireless communication is described. The apparatus may include means for identifying a Relative Least Connection (RLF) event; reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0082] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify a Relative Least Connection (RLF) event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0083] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a beam restoration failure of at least one directional beam, wherein identifying the RLF event may be based on identifying the beam restoration failure.

[0084] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the connection failure type indication in the RLF report can be configured to indicate that the RLF event can be a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

[0085] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received powers of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0086] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying whether the type of handover may be an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover.

[0087] In some examples of the methods, devices, and non-transitory computer-readable media described herein, reestablishing the RRC connection may further include operations, features, means, or instructions for: transmitting an RRC connection reestablishment request; receiving an RRC connection reestablishment message based on transmitting the RRC connection reestablishment request; and transmitting an RRC connection reestablishment complete message based on receiving the RRC connection reestablishment message.

[0088] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an RRC message including an indication that one or more RLF reports may be available for reporting to a network, wherein transmitting the RLF report may be based on transmitting the RRC message including the indication.

[0089] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving an information request message based on transmitting the RRC message including the indication, wherein transmitting the RLF report may be based on receiving the information request message.

[0090] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be part of an information response message transmitted based on receiving the information request message.

[0091] A wireless communication method is described. The method may include reestablishing an RRC connection with a UE after an RLF event; and receiving an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. The method may further include transmitting a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0092] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: reestablish an RRC connection with a UE after an RLF event; and receive an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. The processor and the memory may be further configured to: transmit a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0093] Another apparatus for wireless communication is described. The apparatus may include means for reestablishing an RRC connection with a UE after an RLF event; and receiving an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. The apparatus may further include means for transmitting a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0094] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: reestablish an RRC connection with a UE after an RLF event; and receive an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event was a beam recovery failure and information about one or more directional beams associated with the RLF event. The code may also include instructions executable by the processor to: transmit a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0095] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a source cell associated with a handover of the UE.

[0096] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a core network component, wherein the core network component conveys at least some of the information in the message to a source cell associated with the handover of the UE.

[0097] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the core network component includes at least one component of an EPC.

[0098] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the core network component includes at least one component of a 5GC.

[0099] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: identifying a type of the RLF event; and selecting a type of message to transmit based on the identified type of the RLF event, wherein transmitting the message may be based on the identified type of the RLF event.

[0100] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a RLF indication.

[0101] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a handover report.

[0102] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an Xn interface.

[0103] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an X2 interface.

[0104] A wireless communication method is described. The method may include receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells; and identifying a RLF event associated with the conditional handover. The method may further include reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0105] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: receive an indication of one or more candidate target cells for conditional handover; determine that a handover condition is satisfied for at least one of the one or more candidate target cells; and identify a RLF event associated with the conditional handover. The processor and the memory may be further configured to: reestablish an RRC connection with the cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0106] Another apparatus for wireless communication is described. The apparatus may include means for receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells; and identifying a RLF event associated with the conditional handover. The apparatus may further include means for reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0107] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: receive an indication of one or more candidate target cells for a conditional handover; determine that a handover condition is satisfied for at least one of the one or more candidate target cells; and identify a RLF event associated with the conditional handover. The code may include instructions executable by the processor to: reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0108] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for initiating a RACH to at least one candidate target cell that meets the handover condition, wherein identifying that the RLF event may be associated with the conditional handover failure may be based on initiating the RACH to the at least one candidate target cell.

[0109] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: measuring one or more characteristics associated with the one or more candidate target cells; and determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy one or more thresholds. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining that the handover condition may be satisfied may be based on determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy the one or more thresholds.

[0110] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the RLF report may further include operations, features, means, or instructions for transmitting the RLF report to a set of candidate target cells.

[0111] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying whether the RLF event associated with the conditional handover may be based on a too-late handover scenario from the source cell to one of the one or more candidate target cells or a wrong cell handover scenario to a wrong cell. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report includes information indicating whether the RLF event associated with the conditional handover may be based on the too-late handover scenario or the wrong cell handover scenario.

[0112] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: a duration between a last handover initialization and a connection failure, a list of candidate target cells, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells to attempt connection to after the RLF event occurred, a number of connection attempts made after the RLF event occurred, or a combination thereof.

[0113] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a beam restoration failure of at least one directional beam associated with the conditional handover, wherein identifying the RLF event may be based on identifying the beam restoration failure.

[0114] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be configured to indicate that the RLF event may be a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0115] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received powers of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0116] A wireless communication method is described. The method may include reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and identifying, based on receiving the RLF report, that the RLF event is associated with a conditional handover failure. The method may further include transmitting, based on receiving the RLF report, a message to another cell of a network, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional handover failure.

[0117] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: reestablish an RRC connection with a UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and identify, based on receiving the RLF report, that the RLF event is associated with a conditional handover failure. The processor and the memory may be further configured to: transmit a message to another cell of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional handover failure.

[0118] Another apparatus for wireless communication is described. The apparatus may include means for reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and identifying, based on receiving the RLF report, that the RLF event is associated with a conditional handover failure. The apparatus may further include means for transmitting, based on receiving the RLF report, a message to another cell of a network, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional handover failure.

[0119] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: reestablish an RRC connection with a UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and identify, based on receiving the RLF report, that the RLF event is associated with a conditional handover failure. The code may further include instructions executable by the processor to: transmit, based on receiving the RLF report, a message to another cell of a network, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional handover failure.

[0120] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message to a set of candidate target cells associated with conditional handover, wherein transmitting the message to another cell may be based on transmitting the message to the set of candidate target cells.

[0121] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message includes: a duration between a last handover initialization and a connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

[0122] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying whether an RLF event associated with a conditional handover may be based on a too-late handover scenario from a source cell to one of one or more candidate target cells or a wrong cell handover scenario to a wrong cell. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report includes information indicating whether the RLF event associated with the conditional handover may be based on the too-late handover scenario or the wrong cell handover scenario.

[0123] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting, to the UE, an indication of one or more candidate target cells for conditional handover, wherein receiving the RLF report may be based on transmitting the indication of the one or more candidate target cells for the conditional handover.

[0124] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a set of candidate target cells for conditional handover with the UE; and transmitting a conditional handover request to the set of candidate target cells, wherein transmitting the indication to the UE may be based on transmitting the conditional handover request.

[0125] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: identifying a type of the RLF event; and selecting a type of message to transmit based on the identified type of the RLF event, wherein transmitting the message may be based on the identified type of the RLF event.

[0126] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a RLF indication.

[0127] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message may be a handover report.

[0128] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an Xn interface.

[0129] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another cell may include operations, features, means, or instructions for transmitting the message over an X2 interface.

[0130] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0131] A wireless communication method is described. The method may include: identifying a Relative Least Connection (RLF) event; reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0132] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: identify a Relative Local Area Network (RLN) event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0133] Another apparatus for wireless communication is described. The apparatus may include means for: identifying a Relative Least Connection (RLF) event; reestablishing an RRC connection with a cell based on identifying the RLF event; and transmitting an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0134] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: identify a Relative Least Connection (RLF) event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0135] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a beam recovery failure for at least one directional beam, wherein identifying the RLF event may be based on identifying the beam recovery failure. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying that beam recovery failed for at least one directional beam, wherein identifying the RLF event may be based on identifying the beam recovery failure, wherein a field in the RLF report indicates that the type of the RLF event includes a beam recovery failure.

[0136] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a field in the RLF report may be configured to indicate that the RLF event may be a radio link failure, a handover failure, the beam recovery failure, or a combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a field in the RLF report may be a connection failure type field and may be configured to indicate that the RLF event may be a radio link failure, a handover failure, the beam recovery failure, or a combination thereof. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a duration of a service interruption based on identifying the RLF event, wherein the RLF report indicates the duration of the service interruption.

[0137] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the duration may further include operations, features, means, or instructions for identifying a duration between a first time when the UE lost data transmission capability at the source cell and a second time when the UE was able to resume data transmission at the target cell. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying the duration may further include operations, features, means, or instructions for identifying a duration between a first time when the UE received a handover command from the source cell and a second time when the UE transmitted an RRC reconfiguration complete message to the target cell. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, when dual connectivity is configurable, the duration may be identified for each node.

[0138] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received powers of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0139] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying that the RLF event may be associated with a conditional handover failure, wherein the RLF report includes information about the conditional handover failure.

[0140] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report includes: a duration between a last handover initialization and a connection failure, a list of candidate target cells, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells to attempt connection to after the RLF event occurred, a number of connection attempts made after the RLF event occurred, or a combination thereof.

[0141] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells; and initiating a RACH procedure toward the at least one candidate target cell that satisfies the handover condition. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, identifying that the RLF event may be associated with the conditional handover failure may be based on initiating the RACH toward the at least one candidate target cell.

[0142] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying information about a primary cell and a secondary cell in a dual connectivity configuration, wherein the RLF report includes the identified information.

[0143] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF event may be for an MCG in a dual connectivity configuration. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying measurements for the MCG and measurements for at least one SCG in the dual connectivity configuration, wherein the RLF report includes the measurements.

[0144] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an RSRP of a last serving cell including an MCG and at least one SCG in a dual connectivity configuration, or an RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the RLF report includes the RSRP or RSRQ or both for the last serving cell.

[0145] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying the RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, the RSRQ of the neighboring cell, the frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, wherein the RLF report includes the RSRP, RSRQ, frequency, or identifier of the neighboring cell, or a combination thereof.

[0146] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying C-RNTIs of a primary base station and at least one secondary base station in a dual connectivity configuration, wherein the RLF report includes the C-RNTIs of the primary base station and the at least one secondary base station.

[0147] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of each cell of a primary base station or a secondary base station in a dual connectivity configuration that may be associated with the RLF event, wherein the RLF report includes the identifier of each cell that may be associated with the RLF event.

[0148] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, when a last RRC reconfiguration message including mobility control information is received, an identifier of a primary and secondary cell in a dual connectivity configuration, wherein the RLF report includes the identifier.

[0149] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying whether the type of handover may be an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover.

[0150] In some examples of the methods, devices, and non-transitory computer-readable media described herein, reestablishing the RRC connection may further include operations, features, means, or instructions for: transmitting an RRC connection reestablishment request; receiving an RRC connection reestablishment message based on transmitting the RRC connection reestablishment request; and transmitting an RRC connection reestablishment complete message based on receiving the RRC connection reestablishment message.

[0151] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an RRC message including an indication that one or more RLF reports may be available for reporting to a network, wherein transmitting the RLF report may be based on transmitting the RRC message including the indication.

[0152] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: receiving an information request message based on transmitting the RRC message including the indication, wherein transmitting the RLF report may be based on receiving the information request message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the RLF report may be part of an information response message transmitted based on receiving the information request message. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the RRC message includes an RRC connection reestablishment complete message.

[0153] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for performing a handover between a source cell and a target cell, wherein identifying the RLF event may be based on performing the handover.

[0154] A wireless communication method is described. The method may include: reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmitting a message to another node of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0155] An apparatus for wireless communication is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: reestablish an RRC connection with a UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmit a message to another node of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0156] Another apparatus for wireless communication is described. The apparatus may include means for reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmitting a message to another node of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0157] A non-transitory computer-readable medium storing code for wireless communication is described. The code may include instructions executable by a processor to: reestablish an RRC connection with a UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmit a message to another node of a network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0158] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message to a source node associated with a handover of the UE.

[0159] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message to a core network component, wherein the core network component conveys at least some of the information in the message to a source node associated with a handover of the UE.

[0160] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the core network component includes at least one component of the EPC. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the core network component includes at least one component of the 5GC.

[0161] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: identifying a type of the RLF event; and selecting a type of message to transmit based on the identified type of the RLF event, wherein transmitting the message may be based on the identified type of the RLF event. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message may be an RLF indication. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message may be a handover report.

[0162] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message over an Xn interface.

[0163] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message over an X2 interface.

[0164] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying that a cause of the RLF event may be a beam restoration failure, wherein the message indicates that a type of the RLF event includes the beam restoration failure.

[0165] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the fields of the message include a connection failure type field and can be configured to indicate that the RLF event can be a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0166] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying a duration of the service interruption based on receiving the RLF report, wherein the message indicates the duration of the service interruption.

[0167] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the RLF report may include: a transmission power of the preamble, a number of attempts to successfully transmit the preamble, a number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, or L1 RSRP, or a combination thereof. In some examples of the methods, devices, and non-transitory computer-readable media described herein, the preamble may be a RACH preamble.

[0168] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the message includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0169] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, that the RLF event may be associated with a conditional handover failure, wherein the message includes information about the conditional handover failure.

[0170] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message to a set of candidate target cells associated with the conditional handover, wherein transmitting the message to the other node may be based on transmitting the message to the set of candidate target cells.

[0171] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the message includes: a duration between a last handover initialization and a connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

[0172] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an indication of one or more candidate target cells for conditional handover, wherein receiving the RLF report may be based on transmitting the indication of the one or more candidate target cells for the conditional handover.

[0173] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying information about a primary cell and a secondary cell in a dual connectivity configuration based on receiving the RLF report, wherein the message includes the identified information.

[0174] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, transmitting the message to another node may include operations, features, means, or instructions for transmitting the message to an MCG and an SCG in a dual connectivity configuration.

[0175] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF event may be for an MCG in a dual connectivity configuration. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, measurements for the MCG and measurements for at least one SCG in the dual connectivity configuration, wherein the message includes the measurements.

[0176] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, an RSRP of a last serving cell including an MCG and at least one SCG in a dual connectivity configuration, or an RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the message includes the RSRP or RSRQ or both for the last serving cell.

[0177] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying, based on receiving the RLF report, an RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, an RSRQ of the neighboring cell, a frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, wherein the message includes the RSRP, RSRQ, frequency, or identifier, or a combination thereof, of the neighboring cell.

[0178] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying C-RNTIs of a primary base station and at least one secondary base station in a dual connectivity configuration based on receiving the RLF report, wherein the message includes the C-RNTIs of the primary base station and the at least one secondary base station.

[0179] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of each cell of a primary base station or a secondary base station in a dual connectivity configuration that may be associated with the RLF event based on receiving the RLF report, wherein the message includes an identifier of each cell that may be associated with the RLF event.

[0180] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for identifying an identifier of a primary and secondary cell in the dual connectivity configuration based on receiving the RLF report when a last RRC reconfiguration message including mobility control information is received, wherein the message includes the identifier.

[0181] In some examples of the methods, devices, and non-transitory computer-readable media described herein, reestablishing the RRC connection may further include operations, features, means, or instructions for: receiving an RRC connection reestablishment request from the UE; transmitting an RRC connection reestablishment message based on receiving the RRC connection reestablishment request; and receiving an RRC connection reestablishment completion message based on transmitting the RRC connection reestablishment message.

[0182] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for receiving an RRC message including an indication that the one or more RLF reports may be available at the UE, wherein receiving the RLF report may be based on receiving the RRC message including the indication.

[0183] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting an information request message based on receiving the RRC message including the indication, wherein receiving the RLF report may be based on transmitting the information request message.

[0184] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RLF report may be part of an information response message received based on transmitting the information request message.

[0185] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the RRC message includes an RRC Connection Reestablishment Complete message.

[0186] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for transmitting a handover command to the UE, wherein receiving the RLF report may be based on transmitting the handover command. BRIEF DESCRIPTION OF THE DRAWINGS

[0188] Figure 1

[0014] An example of a system for wireless communications that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0189] Figures 2A-2CAn example of a handover procedure supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0190] Figure 3 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0191] Figure 4 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0192] Figure 5 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0193] Figure 6 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0194] Figure 7 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0195] Figure 8 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0196] Figure 9 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0197] Figure 10 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0198] Figure 11 An example of a process flow supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated.

[0199] Figure 12 and 13 A block diagram of a device supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown.

[0200] Figure 14 A block diagram of a communications manager supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown.

[0201] Figure 15 A diagram is shown of a system including devices supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure.

[0202] Figure 16 and 17 A block diagram of a device supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown.

[0203] Figure 18 A block diagram of a communications manager supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown.

[0204] Figure 19 A diagram is shown of a system including devices supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure.

[0205] Figures 20 to 35 A flow chart illustrating a method of supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is shown.

[0206] Detailed description

[0207] A UE may move through the coverage of a wireless communication system. In order to maintain the connectivity of the UE as the UE moves through the coverage area, one or more handover procedures may be used to transfer (e.g., handover) the UE to a new cell. The network topology may result in locations or areas where the handover procedure is less than optimal and one or more RLF events may occur with greater frequency. To address certain network topologies, the wireless communication system may be configured to cause the UE to report details about the RLF events. Reporting information about the RLF events may be part of a mobility robustness optimization (MRO) procedure implemented by the wireless communication system. The wireless communication system may adjust its handover factor based on feedback associated with the RLF events. In addition, the wireless communication system may utilize directional beams and dual connectivity. Feedback associated with the RLF events may be configured to include information about these network types.

[0208] Described herein are techniques for providing feedback about an RLF event, the feedback including information about directional beams. A UE may experience an RLF event and lose connectivity with the network. After the UE reestablishes an RRC connection with the network, the UE may transmit an RLF report including information about directional beams, information about the primary and secondary nodes in a dual connectivity procedure, information associated with a conditional handover procedure, or information about service time interruption, or a combination thereof. One or more base stations may be configured to transmit at least portions of the information in the RLF report to other base stations as part of a message that may be an example of an RLF indication or handover report. The message may be transmitted over an X2 interface or an Xn interface. Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects of the present disclosure are further illustrated by and described with reference to process flow diagrams. Various aspects of the present disclosure are further illustrated by and described with reference to device diagrams, system diagrams, and flow diagrams related to techniques for conveying mobility information.

[0209] In one or more aspects, the described techniques can support improvements in system efficiency so that devices can avoid inefficiently continuing to use a set of communication characteristics associated with an RLF event. For example, a first device may experience an RLF event with a second device using certain communication characteristics, and can report the communication characteristics associated with the RLF event in an RLF report, which can enable the first device or the second device, or both, to adjust one or more communication characteristics based on the RLF report. In this way, the communication system can serve to enhance network reliability and robustness, which can improve system efficiency and reduce the number of potential retransmissions (e.g., compared to a situation where the first device and the second device continue to use the same communication characteristics). In addition, the communication system can be associated with less interference based on the reduced number of retransmissions, which can further improve network reliability.

[0210] Figure 1 An example of a wireless communication system 100 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 includes a base station 105 (e.g., a gB node (gNB) and / or a radio head (RH)), a UE 115, and a core network 130. In some examples, the wireless communication system 100 can be an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some cases, the wireless communication system 100 can support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices.

[0211] The base station 105 may communicate wirelessly with the UE 115 via one or more base station antennas. The base station 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next-generation Node B, or a gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home eNode B, or some other suitable terminology. The wireless communication system 100 may include different types of base stations 105 (e.g., macro cell base stations or small cell base stations). The UE 115 described herein may be capable of communicating with various types of base stations 105 and network equipment (including macro eNBs, small cell eNBs, gNBs, relay base stations, etc.).

[0212] Each base station 105 can be associated with a particular geographic coverage area 110 in which it supports communications with various UEs 115. Each base station 105 can provide communication coverage for the corresponding geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 can utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 can include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. The UE 115 can communicate with the core network 130 via a communication link 135. Downlink transmissions can also be referred to as forward link transmissions, while uplink transmissions can also be referred to as reverse link transmissions.

[0213] The geographic coverage area 110 of a base station 105 can be divided into sectors that constitute a portion of the geographic coverage area 110, and each sector can be associated with a cell. For example, each base station 105 can provide communication coverage for a macrocell, a small cell, a hotspot, or other types of cells, or various combinations thereof. In some examples, the base station 105 can be mobile and, therefore, provide communication coverage for a mobile geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, and the overlapping geographic coverage areas 110 associated with different technologies can be supported by the same base station 105 or different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous LTE / LTE-A / LTE-A Pro or NR network, in which different types of base stations 105 provide coverage for various geographic coverage areas 110.

[0214] The term "cell" refers to a logical communication entity used to communicate with a base station 105 (e.g., on a carrier) and may be associated with an identifier to distinguish between adjacent cells operating via the same or different carriers (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID)). As used herein, the term "cell" may refer to a node, a cell group (e.g., an MCG or SCG), a base station, an eNB, a gNB, etc. In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., machine type communication (MTC), narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB), or other) that may provide access to different types of devices. In some cases, the term "cell" may refer to a portion (e.g., a sector) of a geographic coverage area 110 on which the logical entity operates.

[0215] UEs 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be stationary or mobile. UE 115 may also be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, where "device" may also be referred to as a unit, station, terminal, or client. UE 115 may also be a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may also refer to a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or an MTC device, etc., which may be implemented in various items (such as appliances, vehicles, meters, etc.).

[0216] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that incorporate sensors or meters to measure or capture information and relay that information to a central server or application, which may utilize the information or present it to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wilderness survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0217] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UEs 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating over a limited bandwidth (e.g., in accordance with narrowband communications). In some cases, UEs 115 may be designed to support critical functions (e.g., mission-critical functions), and the wireless communication system 100 may be configured to provide ultra-reliable communication for these functions.

[0218] In some cases, a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or otherwise unable to receive transmissions from the base station 105. In some cases, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the UEs 115 without involving the base station 105.

[0219] The base stations 105 can communicate with the core network 130 and with each other. For example, the base stations 105 can interface with the core network 130 via a backhaul link 132 (e.g., via an S1, N2, N3, or other interface). The base stations 105 can communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) on a backhaul link 134 (e.g., via an X2, Xn, or other interface).

[0220] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an EPC, which may include at least one mobility management entity (MME), at least one serving gateway (S-GW), and at least one packet data network (PDN) gateway (P-GW). The MME may manage non-access stratum (e.g., control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be delivered through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address allocation and other functions. The P-GW may be connected to network operator IP services. Operator IP services may include access to the Internet, an intranet, an IP multimedia subsystem (IMS), or packet switched (PS) streaming services.

[0221] At least some network devices (such as base stations 105) may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with various UEs 115 through a number of other access network transport entities, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., base station 105).

[0222] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or the decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves can penetrate various structures sufficiently for macrocells to provide service to UEs 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and a shorter range (e.g., less than 100 km) compared to transmissions using the lower frequencies and longer wavelengths in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0223] The wireless communication system 100 may also operate in the Super High Frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also known as centimeter bands). The SHF region includes frequency bands that may be opportunistically used by devices that may be able to tolerate interference from other users, such as the 5 GHz Industrial, Scientific, and Medical (ISM) band.

[0224] The wireless communication system 100 may also operate in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz), which is also referred to as the millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices may be even smaller and more closely spaced than the UHF antennas. In some cases, this may facilitate the use of antenna arrays within the UE 115. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may differ by country or regulatory agency.

[0225] In some cases, the wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band (such as the 5 GHz ISM band). When operating in an unlicensed radio frequency spectrum band, wireless devices (such as base stations 105 and UEs 115) may employ a listen-before-talk (LBT) procedure to ensure that the frequency channel is clear before transmitting data. In some cases, operations in the unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in conjunction with component carriers operating in the licensed band. Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of the two.

[0226] In some examples, base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input, multiple-output (MIMO) communication, or beamforming. For example, wireless communication system 100 may employ a transmission scheme between a transmitting device (e.g., base station 105) and a receiving device (e.g., UE 115), where the transmitting device is equipped with multiple antennas and the receiving device is equipped with one or more antennas. MIMO communication may exploit multipath signal propagation to increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers, which may be referred to as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, a receiving device may receive multiple signals via different antennas or different antenna combinations. Each of these multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams. Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0227] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals conveyed via antenna elements of an antenna array so that signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to the signals conveyed via the antenna elements can include the transmitting device or the receiving device applying a specific amplitude and phase shift to the signal carried via each antenna element associated with the device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0228] In one example, the base station 105 can use multiple antennas or antenna arrays to perform beamforming operations for directional communication with the UE 115. For example, some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) can be transmitted multiple times by the base station 105 in different directions, which can include a signal being transmitted according to different sets of beamforming weights associated with different transmission directions. The transmissions in different beam directions can be used (e.g., by the base station 105 or a receiving device, such as the UE 115) to identify the beam direction used by the base station 105 for subsequent transmission and / or reception.

[0229] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction (e.g., a direction associated with a recipient device, such as UE 115). In some examples, a beam direction associated with transmissions along a single beam direction may be determined based at least in part on signals transmitted in different beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions, and UE 115 may report to base station 105 an indication of the signal it received with the highest signal quality or other acceptable signal quality. Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may use similar techniques for transmitting signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for transmitting signals in a single direction (e.g., for transmitting data to a recipient device).

[0230] A receiving device (e.g., UE 115, which may be an example of a mmW receiving device) may attempt multiple receive beams when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receive beams or receive directions. In some examples, the receiving device may use a single receive beam to receive along a single beam direction (e.g., when receiving a data signal). The single receive beam may be aligned on a beam direction determined at least in part based on listening according to different receive beam directions (e.g., based at least in part on the beam direction determined to have the highest signal strength, highest signal-to-noise ratio, or other acceptable signal quality based on listening according to multiple beam directions).

[0231] In some cases, the antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some cases, the antennas or antenna arrays associated with a base station 105 may be located at different geographic locations. A base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with a UE 115. Similarly, a UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations.

[0232] In some cases, the wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly to communicate on the logical channel. The media access control (MAC) layer can perform priority handling and multiplex logical channels into transport channels. The MAC layer can also use hybrid automatic repeat request (HARQ) to provide retransmission of the MAC layer, thereby improving link efficiency. In the control plane, the RRC protocol layer can provide the establishment, configuration and maintenance of the RRC connection of the radio bearer supporting user plane data between the UE 115 and the base station 105 or the core network 130. In the physical layer, the transport channel can be mapped to the physical channel.

[0233] In some cases, the UE 115 and the base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. HARQ feedback is a technique that increases the likelihood of correctly receiving data on the communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve MAC layer throughput in poor radio conditions (e.g., signal-to-noise ratio conditions). In some cases, a wireless device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a particular time slot for data received in the previous symbol in that time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or based on some other time interval.

[0234] The time interval in LTE or NR can be represented by a basic time unit (which may be, for example, a sampling period T s =1 / 30,720,000 seconds). The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (ms), where the frame period may be expressed as T f =307,200T s. A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 ms. A subframe may be further divided into 2 slots, each slot having a duration of 0.5 ms, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods. In some cases, a subframe may be the minimum scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the minimum scheduling unit of the wireless communication system 100 may be shorter than a subframe or may be dynamically selected (e.g., in a burst of shortened TTI (sTTI) or in a selected component carrier using sTTI).

[0235] In some wireless communication systems, a time slot can be further divided into multiple mini-slots containing one or more symbols. In some instances, a symbol of a mini-slot or a mini-slot can be the smallest scheduling unit. For example, the duration of each symbol can vary depending on the subcarrier spacing or the operating frequency band. Furthermore, some wireless communication systems can implement time slot aggregation, in which multiple time slots or mini-slots are aggregated and used for communication between UE 115 and base station 105.

[0236] The term "carrier" refers to a set of radio frequency spectrum resources that has a defined physical layer structure for supporting communications on the communication link 125. For example, a carrier of the communication link 125 may include a portion of a radio frequency spectrum band that operates according to a physical layer channel for a given radio access technology. Each physical layer channel may carry user data, control information, or other signaling. A carrier may be associated with a predefined frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by the UE 115. A carrier may be downlink or uplink (e.g., in FDD mode), or configured to carry downlink and uplink communications (e.g., in TDD mode). In some examples, a signal waveform transmitted on a carrier may include multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)).

[0237] The organizational structure of a carrier can be different for different radio access technologies (e.g., LTE, LTE-A, LTE-A Pro, NR). For example, communications on a carrier can be organized according to time intervals (TTIs) or time slots, each of which can include user data and control information or signaling to support decoding of the user data. A carrier can also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling to coordinate carrier operations. In some examples (e.g., in a carrier aggregation configuration), a carrier can also have acquisition signaling or control signaling to coordinate the operations of other carriers.

[0238] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier using, for example, time division multiplexing (TDM), frequency division multiplexing (FDM), or a hybrid TDM-FDM technique. In some examples, control information transmitted in a physical control channel may be distributed in a concatenated manner across different control regions (e.g., between a common control region or common search space and one or more UE-specific control regions or UE-specific search spaces).

[0239] A carrier may be associated with a particular bandwidth of radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several predetermined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). In some examples, each served UE 115 may be configured to operate on part or all of the carrier bandwidth. In other examples, some UEs 115 may be configured to operate using a narrowband protocol type associated with a predefined portion or range (e.g., a set of subcarriers or RBs) within a carrier (e.g., an "in-band" deployment of a narrowband protocol type).

[0240] In a system employing MCM technology, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme). Thus, the more resource elements a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate of the UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate of communications with the UE 115.

[0241] A device of the wireless communication system 100 (e.g., a base station 105 or a UE 115) may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 and / or a UE 115 that supports simultaneous communication via carriers associated with more than one different carrier bandwidth.

[0242] The wireless communication system 100 may support communication with a UE 115 on multiple cells or carriers, a feature that may be referred to as carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both FDD and TDD component carriers.

[0243] In some cases, the wireless communication system 100 may utilize an enhanced component carrier (eCC). An eCC may be characterized by one or more characteristics including a wider carrier or frequency channel bandwidth, a shorter symbol duration, a shorter TTI duration, or a modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have suboptimal or non-ideal backhaul links). An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are unable to monitor the entire carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to save power).

[0244] In some cases, an eCC may utilize a different symbol duration than other component carriers, which may include using a reduced symbol duration compared to the symbol duration of other component carriers. The shorter symbol duration may be associated with increased spacing between adjacent subcarriers. A device utilizing an eCC (such as a UE 115 or a base station 105) may transmit a wideband signal (e.g., according to a frequency channel or carrier bandwidth of 20, 40, 60, 80 MHz, etc.) with a reduced symbol duration (e.g., 16.67 microseconds). A TTI in an eCC may include one or more symbol periods. In some cases, the TTI duration (i.e., the number of symbol periods in a TTI) may be variable.

[0245] The wireless communication system 100 may be an NR system that can utilize any combination of licensed, shared, and unlicensed spectrum bands. The flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCCs across multiple spectrums. In some examples, NR shared spectrum may improve spectrum utilization and efficiency, particularly through dynamic vertical (e.g., across the frequency domain) and horizontal (e.g., across the time domain) sharing of resources.

[0246] Described herein are techniques for providing feedback about an RLF event, the feedback including information about directional beams. A UE may experience an RLF event and lose connectivity with a network. After the UE reestablishes an RRC connection with the network, the UE may transmit an RLF report including information about directional beams, information about a primary node and a secondary node in a dual connectivity procedure, information associated with a conditional handover procedure, or information about service time interruption, or a combination thereof. One or more base stations may be configured to transmit at least portions of the information in the RLF report to other base stations as part of a message that may be an example of an RLF indication or a handover report. The message may be transmitted over an X2 interface or an Xn interface.

[0247] One or more base stations 105 may include a communication manager 101 that may receive information related to an RLF event from a UE 115 and may transmit the information using a message (e.g., an RLF indication or a handover report) to other base stations 105. The RLF information may include information about directional beams, information about primary and secondary nodes in a dual connectivity procedure, information associated with a conditional handover procedure, or information about service time interruption, or a combination thereof.

[0248] The UE 115 may include a communication manager 102 that may identify an RLF event and transmit an RLF report to the network after the RRC connection is reestablished. The RLF report may include information about directional beams, information about primary and secondary nodes in a dual connectivity procedure, information associated with a conditional handover procedure, or information about service time interruption, or a combination thereof.

[0249] Figures 2A-2C An example of a handover procedure supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is illustrated. In some examples, the handover procedure can implement aspects of the wireless communication system 100. The wireless communication system 100 can support robust mobility procedures for networks using directional beams (e.g., 5G).

[0250] Figure 2AA late handover procedure 200-a is illustrated. In a late handover procedure, a UE 215-a may experience an RLF event 220-a with a cell 205-a (which may be a source cell) before initiating or completing the handover procedure. As a result, a handover from cell 205-a may be initiated too late, and the UE 215-a may experience an RLF event with the source. The UE 215-a may attempt to re-establish an RRC connection 225-a and / or a radio link with cell 205-b (which may be a target cell). After successfully re-establishing the RRC connection 225-a, the UE 215-a may transmit an RLF report including RLF information to the cell 205-b. The RLF report may allow the UE 215-a to assist the network in reducing the frequency of RLF events by adjusting one or more handover parameters.

[0251] Figure 2B A premature handover procedure 200-b is illustrated. In a premature handover procedure, a UE 215-b may experience an RLF event 220-b with a cell 205-d (which may be a target cell) before initiating or completing the handover procedure. As a result, a handover from a cell 205-c may be initiated prematurely, and the UE 215-b may experience an RLF event with the target. The UE 215-b may attempt to re-establish an RRC connection 225-b and / or a radio link with the cell 205-c (which may be a source cell). After successfully re-establishing the RRC connection 225-b, the UE 215-b may transmit an RLF report including RLF information to the cell 205-c. The RLF report may allow the UE 215-b to assist the network in reducing the frequency of RLF events by adjusting one or more handover parameters.

[0252] Figure 2C An erroneous cell handover procedure 200-c is illustrated. In the erroneous cell handover procedure, a handover from cell 205-e may be initiated with cell 205-f instead of cell 205-g. UE 215-c may experience an RLF event 220-c with cell 205-f (which may be a target cell) before initiating or completing the handover procedure. UE 215-c may attempt to reestablish an RRC connection 225-c and / or radio link with cell 205-g (which may be a third cell). After successfully reestablishing the RRC connection 225-c, UE 215-c may transmit an RLF report including RLF information to cell 205-g. The RLF report may allow UE 215-c to assist the network in reducing the frequency of RLF events by adjusting one or more handover parameters.

[0253] The UE may experience an RLF event due to various reasons. In some examples, the RLF may be associated with a connectivity failure due to intra-RAT mobility of the UE within the 5GC. In some examples, the RLF may be associated with a connectivity failure due to inter-RAT mobility of the UE within the 5GC. In some examples, the RLF may be associated with a connectivity failure due to inter-system mobility of the UE. In some examples, the inter-system mobility of the UE may include a handover from the 5GC to the EPC, or a handover from the EPC to the 5GC. In some examples, the mobility scenario of the UE may include a single connectivity handover scenario or a dual connectivity handover scenario.

[0254] In some implementations, a UE may experience an RLF event with a first cell associated with a first RAT and may attempt to re-establish a connection (e.g., an RRC connection) with a second cell associated with a second RAT. The RLF event may be associated with inter-RAT mobility of the UE, or inter-system mobility of the UE from 5GC to EPC or from EPC to 5GC. For example, a UE may experience an RLF event with a cell associated with 5GC and may attempt to re-establish a connection with a first cell associated with EPC. Accordingly, the UE may establish a connection with the first cell associated with EPC, and in some examples, the UE may transmit an RLF report to the cell associated with EPC, the RLF report including information about the RLF event with the second cell associated with 5GC. In some examples, the first cell and the second cell may be different. In some other examples, the first cell and the second cell may be the same.

[0255] When a UE is in a Multi-RAT Dual Connectivity (MR-DC) configuration, the UE may experience a RLF event. In some examples, the primary node of the dual connectivity configuration may fail. RLF information may include signal strength, frequency, cell identity, other parameters, or a combination thereof. In some examples, the RLF may include both the primary node and the secondary node.

[0256] In the event of a re-establishment failure, the UE may indicate to the cell via a flag after the RRC connection is established that RLF information is available for reporting. In some examples, the UE may include the flag in an RRC Connection Reestablishment Complete message, an RRC Connection Setup Complete message, an RRC Connection Reconfiguration Complete message, another RRC message, or a combination thereof. The network may respond to the flag with a request for the UE to report RLF information using a UE Information Request.

[0257] The RLF report may include: one or more radio measurements, such as the C-RNTI of the primary node and / or the secondary node, the cell identity, an indication of the cause of the RLF, time information, location information, a UE RLF report container, an indication of the beam, service interruption time, a conditional handover failure report, another report, or a combination thereof. In some examples, the radio measurements may include: the signal strength (e.g., RSRP or RSRQ) of the last serving cell (which includes MCG and SCG measurements); the signal strength, frequency, and identity of neighboring cells as configured by the primary node and / or the secondary node; other radio measurements; or a combination thereof. In some examples, the cell identity may include: the cell identity of the failed cell (including the identity of the associated primary node and / or associated secondary node); the identity of the previous primary cell (PCell), where the previous PCell may be the source PCell when the last RRC reconfiguration message and the last mobility control information were received; the identity of the previous primary secondary cell (PSCell), where the previous PSCell may be the source PSCell when the last RRC reconfiguration message and the last mobility control information were received; the identity of the reestablished cell, where the reestablished cell may be the cell that made the reestablishment attempt after the connection failure; another cell identity; or a combination thereof. In some examples, the indication of the cause of the RLF may indicate that the RLF was caused by a handover failure, a beam recovery failure (BRF), etc. In some examples, the time information may include an indication of the time elapsed between handover initialization and the connection failure, an indication of the time elapsed between the connection failure and the delivery of the RLF report, etc. In some examples, the indication of the beam may include a beam identifier, a beam measurement, etc. In some examples, the conditional handover failure report may include a list of candidate cells, a list of cells to try after RLF, a number of attempts after RLF, and the like.

[0258] In some examples, BRF may trigger an RLF report. When an unrecoverable beam failure occurs, the UE may declare an RLF. In some examples, an unrecoverable beam failure may occur when the UE fails to detect a suitable beam for beam recovery. The UE may initiate an RRC re-establishment procedure and transmit an RLF indication to the network. In some examples, the RLF indication may indicate that an RLF report is available together with the beam measurement results. The UE may include an indication of the cause of the RLF. In some examples, the indication of the cause of the RLF may include an indication of BRF. The network may detect a hole in the beam coverage based on the indication of BRF, and may reconfigure the beam resource distribution based on the detection of the hole in the beam coverage.

[0259] In some examples, the UE may transmit RLF information in a beam report. In single or dual connectivity scenarios, the beam report may be transmitted after a handover failure. In some examples, the beam report may be a BRF-triggered RLF report.

[0260] In some examples, the UE may transmit an RLF report independent of the RAT type. For an RLF event at a cell in the 5GC, the UE may transmit an RLF report to the 5GC or to the EPC. For an RLF event at a cell in the EPC, the UE may transmit an RLF report to the 5GC or to the EPC.

[0261] In some examples, the UE may determine whether to transmit an RLF report based on the RAT type. For an RLF event at a cell in the 5GC, the UE may transmit an RLF report to the 5GC but not to the EPC. For an RLF event at a cell in the EPC, the UE may transmit an RLF report to the EPC but not to the 5GC.

[0262] In some examples, the handover procedure may include a handover from a first system (e.g., 5GC) to a second system (e.g., EPC), which may be referred to as an inter-system mobility scenario. The inter-system mobility scenario may include a connectivity failure. The connectivity failure may include an RLF event or a ping pong event. A ping pong event may include multiple handovers between systems, which may result in unnecessary signaling between the UE and the system. In some examples, the connectivity failure may occur in a single connectivity handover scenario or a dual connectivity handover.

[0263] In some examples, a late handover procedure may occur during a handover from 5GC to EPC. In either single or dual connectivity scenarios, a connection failure may occur while the UE is connected to a source cell in 5GC. Prior to the connection failure, no recent handover may have occurred to the UE. The UE may attempt to reestablish a radio link with a target cell in the EPC (e.g., an eNB connected to the EPC).

[0264] In some examples, a premature handover procedure may occur during a handover from the EPC to the 5GC. A connection failure may occur after a recent intersystem handover when the UE attempts to connect to a target cell in the 5GC. A RLF may occur after a handover from a source cell in the EPC to a target cell in the 5GC, which may have single or dual connectivity. The UE may attempt to reconnect to the source cell in the EPC or to another source cell in the EPC.

[0265] In some examples, the UE may send an RLF report after connecting to a target cell in the 5GC. In some examples, the UE may send an RLF report to the EPC, and the EPC may forward the report to the 5GC via radio access network (RAN) information management (RIM) procedures.

[0266] In some examples, the RLF report may include the cell identity of the cell in the EPC to which the UE is connected after the connection failure. The cell identity may include the PCID of the source cell in the EPC selected by the UE after the RLF was detected. Additionally or alternatively, the cell identity may include the PCID and cell global identity (CGI) of the source cell in the EPC from the last handover to the EPC, in which the RLF occurred at the target PCell, which may have single connectivity or dual connectivity.

[0267] In some examples, if a cell in the 5GC has dual connectivity when the RLF occurs, the RLF report may include a dual connectivity indication. In some examples, the dual connectivity indication may include the CGI of the source cell in the 5GC, which includes the primary node PCell CGI and the secondary node PSCell CGI respectively. In some examples, the dual connectivity indication may include the CGI of the failed cell in the 5GC, which includes the primary node PCell CGI and the secondary node PSCell CGI respectively.

[0268] In some examples, the RLF report may include information about the preamble. The RLF report may include: the transmission power of the preamble, the number of attempts to successfully transmit the preamble, the number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, or L1 RSRP, or a combination thereof. In some examples, the transmission power of the preamble may be the UE transmission power that successfully transmitted the preamble. In some examples, the preamble may be a RACH preamble.

[0269] In some examples, the UE may transmit a handover report. The handover report may include a conditional handover failure report. In some examples, the conditional handover failure report may include RLF information, evaluation time, candidate cell measurement results, identified beams, or a combination thereof. In some examples, the conditional handover failure report and RLF information may be forwarded to multiple candidate target cells. In some examples, for inter-system or intra-system mobility scenarios, the conditional handover failure report and RLF information may be transmitted to the secondary node over the Xn or X2 interface. In some examples, the UE may transmit a service interruption time report, which includes the length of the service interruption time during the handover procedure.

[0270] In some examples, if a connection failure occurs while connecting to a cell in the 5GC with dual connectivity in the EPC, the UE may transmit a handover report and RLF information, and the UE may attempt to reconnect to the second cell in the 5GC. The RLF indication may be forwarded from the second cell in the 5GC to the last serving secondary node over the Xn interface, which may in turn forward the RLF indication to the last serving primary node. The secondary node may support either a standalone or non-standalone configuration. The RLF indication may be routed directly to the last serving primary node via the secondary node over the Xn or X2 interface without involving the 5GC.

[0271] The UE may receive a conditional handover configuration before performing a handover procedure. The conditional handover configuration may improve mobility robustness and reduce RLF occurrences. The conditional handover configuration may include a candidate target cell configuration and one or more conditions for performing a handover procedure. If one or more conditions are met, the UE may initiate a RACH procedure to connect to the target cell. In some cases, the UE may perform a handover procedure without sending a measurement report (MR) or waiting for RRC reconfiguration.

[0272] If one or more conditions are not met, the UE may transmit a conditional handover failure report. The conditional handover failure report may include one or more of a time indication, a candidate target cell list, a tried cell list, and the like. In some examples, the time indication may indicate the time elapsed from the last handover initialization until the connection failure. In some examples, the candidate target cell list may include a list of corresponding measurement results (including beam quality). In some examples, the tried cell list may include the number of connection attempts made after the RLF occurred.

[0273] The handover report may include a conditional handover failure report. The handover report may be forwarded to one or more candidate target cells. The one or more candidate target cells may adjust one or more handover parameters based on the handover report. In some examples, the handover report may be forwarded from the source cell to the one or more candidate target cells. Additionally or alternatively, the handover report may be forwarded from the serving cell to the one or more candidate target cells via the source cell.

[0274] In some cases, a UE may transmit a service interruption time report, which may indicate service interruption time that occurred during a handover procedure. The UE may transmit the service interruption time report to the network. The network may adjust resource configuration and / or resource scheduling based on the service interruption time report and the UE's traffic interruption requirements. In some examples, the service interruption time may include the duration between when the UE loses data transmission capability at the source cell and when the UE can resume data transmission at the target cell. Additionally or alternatively, the service interruption time may include the duration between when the UE receives a handover command from the source cell and when the UE transmits an RRC reconfiguration complete message to the target cell. The UE may indicate that the service interruption time report is available after connecting to the target cell. In some examples, the service interruption time may include per-node service interruption time in a dual connectivity scenario. The network may request the UE to transmit the service interruption time report via a UE Information Request message. The UE may transmit the service interruption time report via a UE Information Response message. In some examples, the service interruption time may be forwarded to the source cell. The source cell may adjust radio resource configuration and / or radio resource scheduling based on the service interruption time.

[0275] In some examples, the handover report may include a handover report type, a handover reason, and / or a UE RLF report container. Additionally or alternatively, the handover report may include a source cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a failed cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a reestablished cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively.

[0276] In some examples, the RLF indication and / or the handover report may be sent from the new serving cell to the source secondary node. The source secondary node may forward the RLF indication and / or the handover report to the source primary node via an Xn interface or an X2 interface.

[0277] The 5GC may adjust one or more handover parameters based on real-time RLF reports and / or non-real-time RLF reports. In some examples, including when the UE performs a late handover procedure, the real-time RLF report may include the UE declaring RLF in the source cell and recovering in the target cell. In some examples, including when the UE performs a premature handover procedure, the real-time RLF report may include the UE declaring RLF in the target cell and recovering in the source cell. In some examples, including when the UE performs an erroneous cell handover procedure, the real-time RLF report may include the UE declaring RLF in the target cell and recovering in a third cell. In some examples, in a reestablishment failure scenario, the non-real-time RLF report may include the UE reporting RLF information after the RRC connection is established.

[0278] Figure 3 Illustrated is an example of a process flow 300 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. In some examples, process flow 300 can implement aspects of wireless communication system 100.

[0279] In a late handover procedure, the handover may be initiated too late, and the UE 305 may experience an RLF event with the source cell 315 before the handover procedure is initiated or completed. The UE may attempt to re-establish an RRC connection and / or radio link with the target cell 310. After successfully re-establishing the RRC connection, the UE 305 may transmit an RLF report including RLF information to the target cell 310.

[0280] UE 305 may identify an RLF event based on the too-late handover at 325. UE 305 may declare an RLF event in source cell 315. For example, UE 305 may include a flag in a message indicating that UE 305 has an RLF report to communicate to the network.

[0281] At 330, according to reference Figure 6 Based on the RRC re-establishment procedure described above, UE 305 may re-establish an RRC connection with target cell 310 based on identifying an RLF event. UE 305 may transmit an RLF report to target cell 310 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0282] The target cell 310 may transmit a message indicating at least a portion of the RLF information directly or indirectly to the source cell 315. The message may be an example of an RLF indication or a handover report. In some cases, the message may be communicated indirectly to the source cell 315 via one or more components of the core network (e.g., the cell configuration at 335). In some cases, the message may be communicated directly to the source cell 315 (e.g., the RLF indication at 340).

[0283] At 335, target cell 310 may optionally transmit a cell configuration message to network 320 based on receiving the RLF report from UE 305. Network 320 may forward the cell configuration message to source cell 315. In some examples, the cell configuration message may include a portion of information about one or more directional beams associated with the RLF event.

[0284] At 340, the target cell 310 may optionally transmit an RLF indication to the source cell 315 based on receiving the RLF report from the UE 305. In some aspects, the target cell 310 may transmit the RLF indication to the source cell 315 based on identifying that the RLF event is associated with a too-late handover procedure. In some examples, the RLF indication may include a portion of information regarding one or more directional beams associated with the RLF event. In some implementations, if the target cell 310 transmits a cell configuration message to the network 320 at 335, the target cell 310 may transmit the RLF indication to the source cell 315 at 340. In some other implementations, if the target cell does not transmit a cell configuration message to the network 320 at 340, the target cell 310 may transmit the RLF indication to the source cell 315 at 340. In some other implementations, if the target cell 310 transmits a cell configuration message to the network 320 at 340 , the target cell 310 may not transmit an RLF indication to the source cell 315 at 340 .

[0285] Figure 4 Illustrated is an example of a process flow 400 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. In some examples, process flow 400 can implement aspects of wireless communication system 100.

[0286] In a premature handover procedure, handover may be initiated too early, and UE 405 may experience an RLF event with target cell 410 before the handover procedure is initiated or completed. UE 405 may attempt to re-establish an RRC connection and / or radio link with source cell 415. After successfully re-establishing the RRC connection, UE 405 may transmit an RLF report including RLF information to source cell 415.

[0287] UE 405 may identify an RLF event based on a premature handover at 420. UE 405 may declare an RLF event in target cell 410. For example, UE 405 may include a flag in a message indicating that UE 405 has an RLF report to communicate to the network.

[0288] At 425, according to reference Figure 6 Based on the RRC re-establishment procedure described above, UE 405 may re-establish an RRC connection with source cell 415 based on identifying the RLF event. UE 405 may transmit an RLF report to source cell 415 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0289] The source cell 415 may transmit a message indicating at least a portion of the RLF information to the target cell 410, either directly or indirectly. The message may be an example of an RLF indication or a handover report. In some cases, the message may be conveyed indirectly to the source cell 415 via one or more components of the core network. In some cases, the message (e.g., the RLF indication at 430) may be conveyed directly to the source cell 415.

[0290] At 430, source cell 415 may transmit an RLF indication to target cell 410 based on receiving the RLF report from UE 405. In some examples, the RLF indication may include a portion of information about one or more directional beams associated with the RLF event.

[0291] At 435, the target cell 410 may transmit a handover report to the source cell 415. In some implementations, the target cell 410 may transmit the handover report to the source cell 415 based on identifying that the RLF event is associated with a premature handover procedure. In some examples, the handover report may include a handover report type, a handover cause, and / or a UE RLF report container. Additionally or alternatively, the handover report may include a source cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a failed cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a reestablished cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively.

[0292] Figure 5Illustrated is an example of a process flow 500 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. In some examples, process flow 500 can implement aspects of wireless communication system 100.

[0293] In a false cell handover procedure, handover from source cell 515 may be initiated with target cell 510 instead of third cell 520. UE 505 may experience an RLF event with target cell 510 before the handover procedure is initiated or completed. UE 505 may attempt to re-establish an RRC connection and / or radio link with third cell 520. After successfully re-establishing the RRC connection, UE 505 may transmit an RLF report including RLF information to third cell 520.

[0294] UE 505 may identify an RLF event based on the erroneous cell handover at 525. UE 505 may declare an RLF event in target cell 510. For example, UE 505 may include a flag in a message indicating that UE 505 has an RLF report to communicate to the network.

[0295] The third cell 520 may transmit a message to the target cell 510, the source cell 515, or a combination thereof. The message may be transmitted directly or indirectly with these other cells, or a combination of both. The message may indicate at least a portion of the RLF information received from the UE 505. The message may be an example of an RLF indication or a handover report. In some cases, the message may be conveyed indirectly to the target cell 510 or the source cell 515 via one or more components of the core network. In some cases, the message (e.g., the RLF indication at 535) may be conveyed directly to the target cell 510.

[0296] At 530, according to reference Figure 6 Based on the RRC re-establishment procedure described above, UE 505 may re-establish an RRC connection with third cell 520 based on identifying the RLF event. UE 505 may transmit an RLF report to third cell 520 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0297] At 535, third cell 520 may transmit an RLF indication to target cell 510 based on receiving the RLF report from UE 505. In some examples, the RLF indication may include a portion of information about one or more directional beams associated with the RLF event.

[0298] At 540, the target cell 510 may transmit a handover report to the source cell 515. In some implementations, the target cell 510 may transmit the handover report to the source cell 515 based on identifying that the RLF event is associated with an erroneous cell handover procedure. In some examples, the handover report may include a handover report type, a handover cause, and / or a UE RLF report container. Additionally or alternatively, the handover report may include a source cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a failed cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively. Additionally or alternatively, the handover report may include a reestablished cell CGI, which in the dual connectivity scenario includes a primary node PCell CGI and a secondary node PSCell CGI, respectively.

[0299] Figure 6 An example of a process flow 600 supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated. In some examples, process flow 600 can implement aspects of wireless communication system 100. Process flow 600 illustrates one or more methods for reestablishing an RRC connection, for a UE to indicate that it has RLF information to communicate with the network, or for a UE to transmit an RLF report to the network, or a combination thereof.

[0300] After reestablishing the RRC connection, UE 605 may indicate to cell 610 via a flag that RLF information is available for reporting. In some examples, UE 605 may include the flag in an RRC Connection Reestablishment Complete message, an RRC Connection Setup Complete message, an RRC Connection Reconfiguration Complete message, another RRC message, or a combination thereof. Cell 610 may respond to the flag by transmitting a UE Information Request message to UE 605. The UE Information Request message may include a request for UE 605 to report the RLF information in an RLF report. UE 605 may transmit a UE Information Response message including the RLF report based on the UE Information Request message.

[0301] UE 605 may transmit and cell 610 may receive an RRC connection reestablishment request message at 615. The RRC connection reestablishment request message may include the PCID of the cell in which the RLF occurred and / or a C-RNTI identifying UE 605.

[0302] At 620 , based on the RRC connection reestablishment request message, the cell 610 may transmit and the UE 605 may receive an RRC connection reestablishment message.

[0303] At 625, UE 605 may transmit and cell 610 may receive an RRC connection reestablishment complete message. The RRC connection reestablishment complete message may be transmitted based on receiving the RRC connection reestablishment message. In some examples, the RRC connection reestablishment complete message may include an indication that one or more RLF reports are available at UE 605 for reporting to the network.

[0304] At 630, cell 610 may transmit and UE 605 may receive a UE information request message. The UE information request message may be transmitted based on receiving an RRC connection reestablishment complete message that includes an indication that one or more RLF reports are available for reporting to the network. The UE information request message may include a request for UE 605 to transmit the one or more RLF reports to the network.

[0305] At 635, UE 605 may transmit and cell 610 may receive a UE Information Response message. The UE Information Response message may be transmitted based on receiving the UE Information Request message. The UE Information Response message may include one or more RLF reports.

[0306] The RLF report transmitted by the UE may include information related to beamforming, dual connectivity, service time interruption, conditional handover, or a combination thereof. The RLF report may include one or more radio measurements, the C-RNTI of the primary node and / or secondary node, the cell identity, an indication of the cause of the RLF, time information, location information, a UE RLF report container, an indication of the beam, service interruption time, a conditional handover failure report, another report, or a combination thereof. In some examples, the radio measurements may include: the signal strength (e.g., RSRP or RSRQ) of the last serving cell (which includes MCG and SCG measurements); the signal strength, frequency, and identity of neighboring cells as configured by the primary node and / or secondary node; other radio measurements; or a combination thereof. In some examples, the cell identity may include the cell identity of the failed cell (including the identity of the associated primary node and / or associated secondary node); the identity of the previous PCell, where the previous PCell may be the source PCell when the last RRC reconfiguration message and the last mobility control information were received; the identity of the previous primary secondary cell (PSCell), where the previous PSCell may be the source PSCell when the last RRC reconfiguration message and the last mobility control information were received; the identity of the reestablished cell, where the reestablished cell may be the cell that made the reestablishment attempt after the connection failure; another cell identity; or a combination thereof. In some examples, the indication of the cause of the RLF may indicate that the RLF was caused by a handover failure, a beam recovery failure, etc. In some examples, the time information may include an indication of the time elapsed between handover initialization and the connection failure, an indication of the time elapsed between the connection failure and the delivery of the RLF report, etc. In some examples, the indication of the beam may include a beam identifier, a beam measurement, etc. In some examples, the conditional handover failure report may include a list of candidate cells, a list of cells to try after RLF, a number of attempts after RLF, and the like.

[0307] In some cases, an RLF report may include an indication of the cause of the RLF event. In some implementations, this indication may be included in a field in the RLF report that indicates the cause of the RLF event (e.g., a field dedicated to indicating the cause of the RLF event). The field in the RLF report that includes this indication may sometimes be referred to as a connection failure type field. This field may indicate whether the failure is an RLF, a handover failure, a beam recovery failure, or a combination thereof. Because this field indicates more than two possible outcomes, it may be two or more bits.

[0308] In some cases, the RLF report may include information regarding one or more RACH reports, preambles, or a combination thereof. The RACH report may include information regarding the execution of a RACH procedure to establish uplink synchronization between the UE and the cell. The RLF report may include: the transmission power of the preamble, the number of attempts to successfully transmit the preamble, the number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, or L1 RSRP, or a combination thereof. In some examples, the transmission power of the preamble may be the UE transmission power that successfully transmitted the preamble. In some examples, the preamble may be a RACH preamble. Successfully transmitting the preamble includes transmitting one or more preambles and at least one of the preambles being received and decoded by the intended recipient (e.g., a base station).

[0309] Figure 7 An example of a process flow 700 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is illustrated. In some examples, the process flow 700 can implement aspects of the wireless communication system 100. The process flow 700 can illustrate an inter-system handover from an EPC system to a 5GC system, with RLF information being reported to the 5GC system.

[0310] The handover procedure may include a handover between different RATs (e.g., NR to LTE). Such a handover may be referred to as an inter-system handover from a first system (e.g., EPC) to a second system (e.g., NGC). Inter-system mobility scenarios may include a connectivity failure. A connectivity failure may include an RLF event or a to-and-fro event. A to-and-fro event may include multiple handovers between systems, which may result in unnecessary signaling between the UE and the system. In some examples, a connectivity failure may occur in a single connectivity handover scenario or a dual connectivity handover.

[0311] Inter-system mobility scenarios may include an erroneous cell handover procedure. In an erroneous cell handover procedure, a handover from a source cell 710 (which may be a source cell connected to an EPC 715) may be initiated with a target cell 720-a instead of a target cell 720-b. The target cells 720-a and 720-b may be target cells connected to a 5GC 725. The UE 705 may experience an RLF event with the target cell 720-a before the handover procedure is initiated or completed. The UE 705 may attempt to re-establish an RRC connection and / or radio link with the target cell 720-b. If the attempt to re-establish the RRC connection is successful, the UE 705 may transmit an RLF report including RLF information to the target cell 720-b. The target cell 720-b may forward the RLF report to the source cell 710 via a RIM procedure through the 5GC 725 and the EPC 715.

[0312] At 730, UE 705 may identify an RLF event based on the erroneous cell handover. UE 705 may declare an RLF event in target cell 720-a. For example, UE 705 may include a flag in a message indicating that UE 705 has an RLF report to communicate to the network.

[0313] At 735, according to reference Figure 6 Based on the RRC re-establishment procedure described above, UE 705 may re-establish an RRC connection with target cell 720-b based on identifying an RLF event. UE 705 may transmit an RLF report to target cell 720-b based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0314] At 740, target cell 720-b may transmit an RLF indication to target cell 720-a based on receiving the RLF report from UE 705. In some examples, the RLF indication may include a portion of information about one or more directional beams associated with the RLF event.

[0315] At 745, the target cell 720-b may optionally transmit a cell configuration message to the 5GC 725 based on receiving the RLF report from the UE 705. The 5GC 725 may forward the cell configuration message to the target cell 720-a. In some examples, the cell configuration message may include a portion of information about one or more directional beams associated with the RLF event.

[0316] At 750, the target cell 720-b may transmit a message including the RLF report to the 5GC 725 via RIM procedures based on receiving the RLF report from the UE 705. The 5GC 725 may forward the message to the EPC 715.

[0317] At 755, the EPC 715 may forward the message to the source cell 710 based on receiving the message from the 5GC 725. In some examples, the EPC 715 may forward the message to the source cell 710 based on identifying that the RLF event is associated with an erroneous cell handover procedure.

[0318] Figure 8 An example of a process flow 800 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is illustrated. In some examples, process flow 800 can implement aspects of wireless communication system 100. Process flow 800 can illustrate an inter-system handover from an EPC system to a 5GC system, with RLF information being reported to the EPC system.

[0319] The handover procedure may include a handover from a first system (e.g., EPC) to a second system (e.g., NGC) in an inter-system mobility scenario. The inter-system mobility scenario may include a connection failure. The connection failure may include a premature handover procedure. In a premature handover procedure, a handover from a source cell 810 (which may be a source cell in EPC 815) may be initiated prematurely with a target cell 820 (which may be a target cell in 5GC 825). The UE 805 may experience an RLF event with the target cell 820 before the handover procedure is initiated or completed. The UE 805 may attempt to reestablish an RRC connection and / or radio link with the source cell 810. After successfully reestablishing the RRC connection, the UE 805 may transmit an RLF report including RLF information to the source cell 810. The source cell 810 may forward the RLF report to the target cell 820 via the EPC 815 and the 5GC 825 via the RIM procedure based on the premature handover procedure. In some examples, the source cell 810 may transmit the RLF indication comprising a portion of the RLF report directly to the target cell 820 based on the premature handover procedure.

[0320] At 830, the source cell 810 may transmit and the UE 805 may receive a handover command to initiate a handover to the target cell 820. The UE 805 may initiate a handover procedure based on receiving the handover command.The handover may be initiated prematurely and may include a premature handover procedure.

[0321] At 835, UE 805 may identify an RLF event based on a premature handover. UE 805 may declare an RLF event in target cell 820. For example, UE 805 may include a flag in a message indicating that UE 805 has an RLF report to communicate to the network.

[0322] At 840, according to reference Figure 6 Based on the RRC re-establishment procedure described above, UE 805 may re-establish an RRC connection with source cell 810 based on identifying the RLF event. UE 805 may transmit an RLF report to source cell 810 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0323] At 845, source cell 810 may optionally transmit an RLF indication directly to target cell 820 based on receiving the RLF report from UE 805. In some examples, the RLF indication may include a portion of information about one or more directional beams associated with the RLF event.

[0324] At 850, source cell 810 may transmit a message including the RLF report to EPC 815 via RIM procedures based on receiving the RLF report from UE 805. In some examples, source cell 810 may transmit the message including the RLF report to EPC 815 based on identifying that the RLF event is associated with a premature handover procedure.

[0325] At 855, EPC 815 may forward the message to 5GC 825 based on receiving the message from source cell 810. 5GC 825 may forward the message to target cell 820. In some examples, 5GC 825 may forward the message to target cell 820 based on identifying that the RLF event is associated with a premature handover procedure.

[0326] Figure 9 Illustrated is an example of a process flow 900 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. In some examples, process flow 900 can implement aspects of wireless communication system 100.

[0327] The connection failure may include a late handover procedure. In a late handover procedure, the handover may be initiated too late, and the UE 905 may experience an RLF event with the source cell 910-a before the handover procedure is initiated or completed. In some examples, the source cell 910-a may be a master node of a dual-connectivity source cell in the 5GC 920. The source cell 910-a may be in communication with the source cell 910-b via the X2 interface 925. The source cell 910-b may be a secondary node of the dual-connectivity source cell. Additionally or alternatively, the source cell may have dual connectivity with the EPC and the 5GC 920. The source cell 910-a may be a source cell in the EPC (e.g., an eNB in ​​the EPC), and the source cell 910-b may be a source cell in the 5GC 920.

[0328] The UE 905 may attempt to reestablish an RRC connection and / or radio link with the target cell 915. After successfully reestablishing the RRC connection, the UE 905 may transmit an RLF report including RLF information to the target cell 915. In some examples, if a connection failure occurs while connected to the source cell 910-a in the EPC via the source cell 910-b with dual connectivity in the 5GC 920, the UE 905 may transmit an RLF report, and the UE may attempt to reconnect with the target cell 915 in the 5GC 920. The target cell 915 may transmit one or more messages including at least some of the RLF information received from the UE 905 to other devices or cells (e.g., the source cell 910). A message (e.g., an RLF indication or a handover report) may be transmitted from the target cell 915 to the source cell 910-b over the Xn interface 930, which may in turn forward the message (e.g., an RLF indication or a handover report) to the source cell 910-a via the X2 interface 925. The source cell 910-b may support either a standalone or non-standalone configuration. The message (e.g., an RLF indication or a handover report) may be routed directly to the source cell 910-a via the source cell 910-b over the Xn interface 930 or the X2 interface 925 without involving the 5GC 920. The message transmitted between the cells may include any combination of the information included in the RLF report received from the UE 905.

[0329] At 935, the UE 905 may identify an RLF event. The UE 905 may declare an RLF event in the source cell 910-a. For example, the UE 905 may include a flag in the message indicating that the UE 905 has an RLF report to communicate to the network.

[0330] At 940, according to reference Figure 6 Based on the RRC re-establishment procedure described above, the UE 905 may re-establish an RRC connection with the target cell 915 based on identifying the RLF event. The UE 905 may transmit an RLF report to the target cell 915 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event.

[0331] At 945, the target cell 915 may transmit an RLF indication to the source cell 910-b based on receiving the RLF report from the UE 905. The target cell 915 may transmit the RLF indication via the Xn interface 930. In some examples, the RLF indication may include a portion of information about one or more directional beams associated with the RLF event.

[0332] At 950, source cell 910-b may forward the RLF indication to source cell 910-a based on receiving the RLF indication from target cell 915. Source cell 910-b may forward the RLF indication to source cell 910-a via an X2 interface 925. In some examples, source cell 910-b may forward the RLF indication to source cell 910-a based on identifying that the RLF event is associated with a too-late handover procedure.

[0333] Figure 10 An example of a process flow 1000 supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure is illustrated. In some examples, process flow 1000 can implement aspects of wireless communication system 100. Process flow 1000 can illustrate features related to RLF reporting and conditional handover procedures.

[0334] UE 1005 may receive a conditional handover configuration before executing a handover procedure. The conditional handover procedure may allow UE 1005 to initiate a handover procedure when at least one candidate target cell meets criteria. The conditional handover configuration may improve mobility robustness and reduce RLF occurrences. The conditional handover configuration may include a candidate target cell configuration and one or more conditions for executing a handover procedure. If one or more conditions are met, UE 1005 may initiate a RACH procedure to connect to the target cell. In some examples, UE 1005 may execute a handover procedure and wait for RRC reconfiguration.

[0335] UE 1005 may transmit a measurement report to source cell 1015. Source cell 1015 may initiate a conditional handover procedure and identify one or more candidate target cells (e.g., target cells 1010, 1020, or 1025). In some cases, source cell 1015 may transmit a conditional handover request to each of the identified candidate target cells. After the candidate target cells acknowledge the conditional handover request, source cell 1015 may transmit an RRC message including conditional handover procedure information and / or a list of candidate target cells for conditional handover. UE 1005 may measure characteristics associated with each of the candidate target cells. When at least one of the target cells meets one or more thresholds, UE 1005 may initiate a handover procedure to the identified target cells (without intervention by the source cell) based, at least in part, on this being part of the conditional handover procedure.

[0336] Following an RLF event during conditional handover, UE 1005 may transmit an RLF report. The RLF report may include information regarding the conditional handover failure. In some examples, the RLF report may include information regarding one or more directional beams associated with the RLF event and information regarding the conditional handover failure. In some examples, the report may include RLF information, an evaluation time, candidate cell measurement results, an identified beam, or a combination thereof. In some examples, the RLF report and / or RLF information may be forwarded to multiple candidate target cells, including target cell 1020 and target cell 1025.

[0337] If one or more conditions are not met, the UE 1005 may transmit an RLF report. The RLF report may include one or more of a time indication, a candidate target cell list, a tried cell list, and the like. In some examples, the time indication may indicate the time elapsed from the last handover initialization until the connection failure. In some examples, the candidate target cell list may include a list of corresponding measurement results (including beam quality). In some examples, the tried cell list may include the number of connection attempts made after the RLF occurred.

[0338] As part of the RRC re-establishment procedure, UE 1005 may transmit an RLF report to target cell 1010. The RLF report may include information about a conditional handover failure. The RLF report, or a portion thereof, may be transmitted from target cell 1010 to target cell 1020 in a message (e.g., an RLF indication or a handover report). The RLF report, or a portion thereof, may be forwarded from target cell 1020 to source cell 1015, and source cell 1015 may forward at least a portion of the RLF report to target cell 1025. Target cell 1020, target cell 1025, and source cell 1015 may adjust one or more handover parameters based on the information in the RLF report.

[0339] At 1030, the UE 1005 may identify an RLF event. The RLF event may be based on a conditional handover procedure, which may include a late handover or an erroneous cell handover. The UE 1005 may declare an RLF event in the source cell 1015, the target cell 1020, the target cell 1025, or a combination thereof based on the type of handover scenario that occurred.

[0340] At 1035, according to reference Figure 6Based on the RRC re-establishment procedure described above, UE 1005 may re-establish an RRC connection with target cell 1010 based on identifying an RLF event. UE 1005 may transmit an RLF report to target cell 1010 based on re-establishing the RRC connection. In some examples, the RLF report may include information about one or more directional beams associated with the RLF event. In some cases, the RLF report may include information about each candidate target cell involved in the conditional handover procedure.

[0341] At 1040, target cell 1010 may transmit a message (e.g., an RLF indication or a handover report) to target cell 1020 based on receiving the RLF report from UE 1005. The message may include at least a portion of the information of the RLF report. In some examples, the message may include a portion of information about one or more directional beams associated with the RLF event. In some cases, the message may include information about each candidate target cell involved in the conditional handover procedure.

[0342] At 1045, target cell 1020 may forward at least a portion of the RLF report to source cell 1015 (e.g., in a message such as an RLF indication or a handover report) based on receiving the RLF indication. At 1050, source cell 1015 may forward at least a portion of the RLF report to one or more candidate target cells (e.g., in a message such as an RLF indication or a handover report), the one or more candidate target cells may include target cell 1025. In some examples, source cell 1015 may forward at least a portion of the RLF report to one or more candidate target cells (e.g., target cell 1025) to enable the candidate target cells to adjust one or more handover parameters based on information in the RLF report based on the conditional handover failure. The candidate target cells may adjust the one or more handover parameters based on the RLF information, the evaluation time, the candidate cell measurement results, or the identified beams included in the RLF report, or a combination thereof.

[0343] Figure 11 Illustrated is an example of a process flow 1100 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. In some examples, process flow 1100 can implement aspects of wireless communication system 100.

[0344] UE 1105 may transmit an indication of service interruption time, which may indicate the service interruption time that occurred during the handover procedure. In some cases, the indication of service interruption time may be included in an RLF report. In some cases, the indication of service interruption time may be transmitted as part of its own report or a different report. The UE may transmit service interruption time information to the target cell 1115. In some examples, the service interruption time may include the duration between the time when UE 1105 loses data transmission capability at the source cell 1110-a and the time when UE 1105 can resume data transmission at the target cell 1115. Additionally or alternatively, the service interruption time may include the duration between the time when UE 1105 receives a handover command from the source cell 1110-a and the time when UE 1105 transmits an RRC reconfiguration complete message to the target cell 1115. UE 1105 may indicate that the service interruption time information is available after connecting to the target cell 1115. In some examples, the service interruption time information may include a service interruption time per node (e.g., for each of a primary node and a secondary node) in a dual connectivity scenario. In some examples, the service interruption time information may be forwarded to source cell 1110-a, which may forward the service interruption time information to source cell 1110-b. In a dual connectivity scenario, source cell 1110-a may be the primary node, and source cell 1110-b may be the secondary node. Source cell 1110-a and source cell 1110-b may adjust radio resource configuration and / or radio resource scheduling based on the service interruption time information.

[0345] UE 1105 may attempt to re-establish an RRC connection and / or radio link with target cell 1115. After successfully re-establishing the RRC connection, UE 1105 may transmit service interruption time information to target cell 1115. The service interruption time information may be forwarded from target cell 1115 to source cell 1110-a, which may in turn forward the service interruption time information to source cell 1110-b. The service interruption time information may be routed directly to source cell 1110-a and forwarded to source cell 1110-b without involving 5GC 1120.

[0346] At 1125, the source cell 1110-a may transmit and the UE 1105 may receive a handover command to initiate a handover to the target cell 1115. The UE 1105 may initiate a handover procedure based on receiving the handover command.

[0347] At 1130, according to reference Figure 6According to the RRC re-establishment procedure described above, the UE 1105 may re-establish the RRC connection with the target cell 1115 based on the handover procedure. The UE 1105 may transmit service interruption time information to the target cell 1115 based on the re-established RRC connection.

[0348] At 1135, the target cell 1115 may forward the service interruption time information to the source cell 1110-a via RAN messaging based on receiving the service interruption time information from the UE 1105. The service interruption time information may be forwarded to the source cell 1110-a without involving the 5GC 1120.

[0349] At 1140, source cell 1110-a may forward the service interruption time information to source cell 1110-b via RAN messaging based on receiving the service interruption time information from target cell 1115. The service interruption time information may be forwarded to source cell 1110-b without involving 5GC 1120.

[0350] Figure 12 A block diagram 1200 is shown of a device 1205 supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. The device 1205 may be an example of aspects of the UE 115 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1220. The device 1205 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0351] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for conveying mobility information, etc.). The information may be passed to other components of the device 1205. The receiver 1210 may be a reference Figure 15 Examples of various aspects of the transceiver 1520 are described. The receiver 1210 may utilize a single antenna or a collection of antennas.

[0352] The communication manager 1215 may identify an RLF event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. The communication manager 1215 may be an example of aspects of the communication manager 1510 described herein.

[0353] Additionally or alternatively, the communication manager 1215 may identify an RLF event associated with the first RAT; re-establish an RRC connection with a cell of the second RAT based on identifying the RLF event associated with the first RAT; and transmit an RLF report to the cell based at least in part on re-establishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0354] Additionally or alternatively, the communication manager 1215 may identify an RLF event; re-establish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based at least in part on re-establishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0355] Additionally or alternatively, the communication manager 1215 may receive an indication of one or more candidate target cells for conditional handover, determine that a handover condition is satisfied for at least one of the one or more candidate target cells, and identify an RLF event associated with the conditional handover. The communication manager 1215 may additionally reestablish an RRC connection with the cell based on identifying the RLF event, and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0356] The communication manager 1215 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1215 or its subcomponents may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0357] The communication manager 1215 or its subcomponents can be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1215 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1215 or its subcomponents can be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0358] The transmitter 1220 may transmit signals generated by other components of the device 1205. In some examples, the transmitter 1220 may be co-located with the receiver 1210 in a transceiver module. For example, the transmitter 1220 may be a reference Figure 15 Examples of aspects of the transceiver 1520 are described. The transmitter 1220 may utilize a single antenna or a collection of antennas.

[0359] In some examples, the communication manager 1215 may be implemented as an integrated circuit or chipset for a mobile device modem, and the receiver 1210 and transmitter 1220 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to the mobile device modem to enable wireless transmission and reception on one or more frequency bands.

[0360] In some aspects, the communication manager 1215 can be implemented to enable the device 1205 to communicate more efficiently with another device (e.g., a base station) based on fewer RLF events. For example, the communication system in which the device 1205 operates can function to enhance reliability and robustness based on one or more adjusted communication characteristics associated with RLF events, which can reduce the number of RLF events that the device 1205 may experience.

[0361] Based on the technology for enhancing network reliability and robustness, device 1205 can maintain a more consistent connection state and, as such, transmit fewer connection requests. Accordingly, communication manager 1215 can perform fewer processing operations associated with network connectivity and connection request transmission. For example, the processor of device 1205 can power one or more processing units used to identify network connectivity and transmit connection requests less frequently, which can result in lower power usage and improved battery life.

[0362] Figure 13A block diagram 1300 is shown of a device 1305 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. The device 1305 may be an example of aspects of the device 1205 or UE 115 as described herein. The device 1305 may include a receiver 1310, a communication manager 1315, and a transmitter 1335. The device 1305 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0363] The receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for conveying mobility information, etc.). The information may be passed to other components of the device 1305. The receiver 1310 may be a reference Figure 15 Examples of various aspects of the transceiver 1520 are described. The receiver 1310 may utilize a single antenna or a collection of antennas.

[0364] Communications manager 1315 may be an example of aspects of communications manager 1215 as described herein. Communications manager 1315 may include RLF manager 1320, RRC manager 1325, and RLF reporting manager 1330. Communications manager 1315 may be an example of aspects of communications manager 1510 as described herein.

[0365] The RLF manager 1320 may identify an RLF event. The RRC manager 1325 may reestablish an RRC connection with the cell based on identifying the RLF event. The RLF report manager 1330 may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0366] The transmitter 1335 may transmit signals generated by other components of the device 1305. In some examples, the transmitter 1335 may be co-located with the receiver 1310 in a transceiver module. Figure 15 Examples of various aspects of the transceiver 1520 are described. The transmitter 1335 may utilize a single antenna or a collection of antennas.

[0367] Figure 14A block diagram 1400 is shown of a communications manager 1405 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. Communications manager 1405 may be an example of aspects of communications manager 1215, communications manager 1315, or communications manager 1510 described herein. Communications manager 1405 may include an RLF manager 1410, an RRC manager 1415, an RLF reporting manager 1420, a service interruption manager 1425, a conditional handover manager 1430, a dual connectivity manager 1435, a handover manager 1440, and an RRC connection reestablishment manager 1445. Each of these modules may communicate directly or indirectly with one another (e.g., via one or more buses).

[0368] The RLF manager 1410 may identify an RLF event. In some examples, the RLF manager 1410 may identify an RLF event associated with a first RAT. In some examples, the RLF manager 1410 may identify a beam recovery failure for at least one directional beam, wherein identifying the RLF event is based on identifying the beam recovery failure. In some examples, the RLF manager 1410 may identify a beam recovery failure for at least one directional beam associated with the first RAT, wherein identifying the RLF event is based on identifying the beam recovery failure. In some examples, the RLF manager 1410 may identify a beam recovery failure for at least one directional beam associated with a conditional handover, wherein identifying the RLF event is based on identifying the beam recovery failure. In some examples, the RLF manager 1410 may identify that beam recovery failed for at least one directional beam, wherein identifying the RLF event is based on identifying the beam recovery failure, wherein a field in the RLF report indicates that the type of the RLF event includes a beam recovery failure.

[0369] The RRC manager 1415 may reestablish an RRC connection with the cell based on identifying the RLF event. In some examples, the RRC manager 1415 may reestablish an RRC connection with the cell of the second RAT based on identifying the RLF event associated with the first RAT. In some examples, the first RAT is associated with 5GC and the second RAT is associated with EPC. The RLF report manager 1420 may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. In some examples, the RLF report manager 1420 may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure. In some examples, the RLF report manager 1420 may transmit an RRC message including an indication that one or more RLF reports are available for reporting to the network, wherein transmitting the RLF report is based on transmitting the RRC message including the indication. In some examples, the RLF reporting manager 1420 may receive an information request message based on transmitting an RRC message including the indication, wherein transmitting the RLF report is based on receiving the information request message.

[0370] In some cases, the field in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof. In some cases, the field in the RLF report is a connection failure type indication and is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof. In some cases, the RLF report includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received power of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0371] In some cases, the RLF report is part of an information response message transmitted upon receipt of the information request message. In some cases, the RRC message includes an RRC connection reestablishment complete message. In some cases, the RLF report may include: the transmission power of the preamble, the number of attempts to successfully transmit the preamble, the number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, L1 RSRP, or a combination thereof. In some cases, the preamble may be a RACH preamble.

[0372] The service interruption manager 1425 may identify a duration of the service interruption based on identifying the RLF event, wherein the RLF report indicates the duration of the service interruption. In some examples, the service interruption manager 1425 may identify a duration between a first time when the UE loses data transmission capability at the source cell and a second time when the UE is able to resume data transmission at the target cell. In some examples, the service interruption manager 1425 may identify a duration between a first time when the UE loses data transmission capability at the source cell of a first RAT and a time when the UE is able to resume data transmission at a cell having a second RAT. In some examples, the service interruption manager 1425 may identify a duration between a first time when the UE receives a handover command from the source cell and a second time when the UE transmits an RRC reconfiguration complete message to the target cell. In some cases, when dual connectivity is configured, the duration is identified for each node.

[0373] The conditional handover manager 1430 may identify the RLF event as associated with a conditional handover failure, wherein the RLF report includes information regarding the conditional handover failure. In some examples, the conditional handover manager 1430 may receive an indication of one or more candidate target cells for conditional handover. In some examples, the conditional handover manager 1430 may determine that a handover condition is satisfied for at least one of the one or more candidate target cells. In some examples, the conditional handover manager 1430 may initiate a RACH to the at least one candidate target cell that satisfies the handover condition, wherein identifying the RLF event as associated with the conditional handover failure is based on initiating a RACH to the at least one candidate target cell. In some cases, the RLF report includes: a duration between the last handover initiation and the connection failure; a list of candidate target cells including at least the cell; measurement information for at least one target cell in the list of candidate target cells; an indication of one or more target cells to which connection was attempted after the RLF event occurred; a number of connection attempts made after the RLF event occurred; or a combination thereof.

[0374] In some examples, the conditional handover manager 1430 may measure one or more characteristics associated with the one or more candidate target cells. In some examples, the conditional handover manager 1430 may determine that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy one or more thresholds, wherein determining that the handover condition is satisfied is based on determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy the one or more thresholds. In some examples, the conditional handover manager 1430 may identify whether the RLF event associated with the conditional handover is based on a too-late handover scenario from the source cell to one of the one or more candidate target cells or a wrong cell handover scenario to a wrong cell, wherein the RLF report includes information indicating whether the RLF event associated with the conditional handover is based on the too-late handover scenario or the wrong cell handover scenario.

[0375] The dual connectivity manager 1435 may identify information about a primary cell and a secondary cell in the dual connectivity configuration, wherein the RLF report includes the identified information. In some examples, the dual connectivity manager 1435 may identify measurements for an MCG and measurements for at least one SCG in the dual connectivity configuration, wherein the RLF report includes the measurements. In some examples, the dual connectivity manager 1435 may identify an RSRP of a last serving cell including an MCG and at least one SCG in the dual connectivity configuration, or an RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the RLF report includes the RSRP, RSRQ, or both for the last serving cell.

[0376] In some examples, the dual connectivity manager 1435 may identify the RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, the RSRQ of the neighboring cell, the frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, wherein the RLF report includes the RSRP, RSRQ, frequency, or identifier of the neighboring cell, or a combination thereof.

[0377] In some examples, the dual connectivity manager 1435 may identify C-RNTIs of a primary base station and at least one secondary base station in a dual connectivity configuration, wherein the RLF report includes C-RNTIs of the primary base station and the at least one secondary base station.

[0378] In some examples, the dual connectivity manager 1435 may identify an identifier of each cell associated with the RLF event for a primary base station or a secondary base station in a dual connectivity configuration, wherein the RLF report includes an identifier of each cell associated with the RLF event.

[0379] In some examples, the dual connectivity manager 1435 may identify the identifiers of the primary and secondary cells in the dual connectivity configuration when the last RRC reconfiguration message including the mobility control information is received, wherein the RLF report includes the identifiers. In some cases, the RLF event is for an MCG in the dual connectivity configuration.

[0380] The handover manager 1440 may identify whether the type of handover is an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover. In some examples, the handover manager 1440 may perform a handover between a source cell and a target cell, wherein identifying the RLF event may be based on performing the handover.

[0381] The RRC connection reestablishment manager 1445 may transmit an RRC connection reestablishment request. In some examples, the RRC connection reestablishment manager 1445 may receive an RRC connection reestablishment message based on transmitting the RRC connection reestablishment request. In some examples, the RRC connection reestablishment manager 1445 may transmit an RRC connection reestablishment complete message based on receiving the RRC connection reestablishment message.

[0382] Figure 15 A diagram of a system 1500 including a device 1505 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. Device 1505 may be an example of or include components of device 1205, device 1305, or UE 115 as described herein. Device 1505 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communications manager 1510, an I / O controller 1515, a transceiver 1520, an antenna 1525, a memory 1530, and a processor 1540. These components may be in electronic communication via one or more buses (e.g., bus 1545).

[0383] The communication manager 1510 may identify an RLF event; reestablish an RRC connection with a cell based on identifying the RLF event; and transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0384] I / O controller 1515 can manage input and output signals for device 1505. I / O controller 1515 can also manage peripheral devices that are not integrated into device 1505. In some cases, I / O controller 1515 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1515 can utilize an operating system, such as or another known operating system. In other cases, I / O controller 1515 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1515 may be implemented as part of a processor. In some cases, a user may interact with device 1505 via I / O controller 1515 or via hardware components controlled by I / O controller 1515.

[0385] The transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1520 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna.

[0386] In some cases, a wireless device may include a single antenna 1525. However, in some cases, the device may have more than one antenna 1525, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0387] Memory 1530 may include random access memory (RAM) and read-only memory (ROM). Memory 1530 may store computer-readable, computer-executable code 1535 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 1530 may include, among other things, a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0388] Processor 1540 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1540 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., functions or tasks supporting the technology for communicating mobility information).

[0389] The code 1535 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, the code 1535 may not be directly executable by the processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0390] Figure 16 A block diagram 1600 is shown of a device 1605 supporting techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. The device 1605 may be an example of aspects of a base station 105 as described herein. In some examples, the device 1605 may be an example of a cell, a node, a cell cluster, or any combination thereof. The device 1605 may include a receiver 1610, a communication manager 1615, and a transmitter 1620. The device 1605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0391] The receiver 1610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for conveying mobility information, etc.). The information may be passed to other components of the device 1605. The receiver 1610 may be a reference Figure 19 Examples of aspects of the described transceiver 1920. The receiver 1610 may utilize a single antenna or a collection of antennas.

[0392] The communication manager 1615 may reestablish an RRC connection with the UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmit a message to another node of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event. The communication manager 1615 may be an example of aspects of the communication manager 1910 described herein.

[0393] Additionally or alternatively, the communication manager 1615 may reestablish an RRC connection with the UE after an RLF event, wherein the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT. Additionally, the communication manager 1615 may receive an RLF report from the UE over the RRC connection of the second RAT, the RLF report including information about one or more directional beams associated with the RLF event; and transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0394] Additionally or alternatively, the communication manager 1615 may reestablish an RRC connection with the UE after an RLF event; receive an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event; and transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0395] Additionally or alternatively, the communication manager 1615 may reestablish an RRC connection with the UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; identify that the RLF event is associated with a conditional switching failure based on receiving the RLF report; and transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional switching failure.

[0396] The communication manager 1615 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1615 or its subcomponents may be performed by a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0397] The communication manager 1615 or its subcomponents can be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1615 or its subcomponents can be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0398] The transmitter 1620 may transmit signals generated by other components of the device 1605. In some examples, the transmitter 1620 may be co-located with the receiver 1610 in a transceiver module. For example, the transmitter 1620 may be a reference Figure 19 Examples of aspects of the described transceiver 1920. The transmitter 1620 may utilize a single antenna or a collection of antennas.

[0399] In some aspects, the communication manager 1615 can be implemented to enable the device 1605 to maintain a more consistent connection with other devices (e.g., such as UEs) and, as such, perform fewer connection reestablishment procedures associated with RLF events. Accordingly, the device 1605 can power one or more processing units associated with monitoring for connection requests and transmitting setup messages less frequently, which can result in less power consumption.

[0400] Figure 17 A block diagram 1700 is shown of a device 1705 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. The device 1705 may be an example of aspects of the device 1605 or base station 105 as described herein. The device 1705 may include a receiver 1710, a communication manager 1715, and a transmitter 1735. The device 1705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0401] The receiver 1710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to techniques for conveying mobility information, etc.). The information may be passed to other components of the device 1705. The receiver 1710 may be a reference Figure 19 Examples of various aspects of the described transceiver 1920. The receiver 1710 may utilize a single antenna or a collection of antennas.

[0402] Communications manager 1715 may be an example of aspects of communications manager 1615 as described herein. Communications manager 1715 may include RRC manager 1720, RLF report manager 1725, and RLF message manager 1730. Communications manager 1715 may be an example of aspects of communications manager 1910 as described herein.

[0403] The RRC manager 1720 may reestablish an RRC connection with the UE after an RLF event. The RLF report manager 1725 may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The RLF message manager 1730 may transmit a message to another node of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0404] The transmitter 1735 can transmit signals generated by other components of the device 1705. In some examples, the transmitter 1735 can be co-located with the receiver 1710 in a transceiver module. For example, the transmitter 1735 can be a reference Figure 19 Examples of various aspects of the described transceiver 1920. The transmitter 1735 may utilize a single antenna or a collection of antennas.

[0405] Figure 18 Block diagram 1800 illustrates a communications manager 1805 that supports techniques for communicating mobility information in accordance with one or more aspects of the present disclosure. Communications manager 1805 may be an example of aspects of communications manager 1615, communications manager 1715, or communications manager 1910 described herein. Communications manager 1805 may include an RRC manager 1810, an RLF reporting manager 1815, an RLF message manager 1820, an RLF manager 1825, a service interruption manager 1830, a conditional handover manager 1835, and a dual connectivity manager 1840. Each of these modules may communicate directly or indirectly with one another (e.g., via one or more buses).

[0406] The RRC manager 1810 may reestablish an RRC connection with the UE after an RLF event. In some examples, the RRC manager 1810 may reestablish an RRC connection with the UE after an RLF event, where the RLF event is associated with a first RAT and the RRC connection is associated with a second RAT. In some examples, the first RAT may be 5GC and the second RAT may be EPC. In some examples, the RRC manager 1810 may receive an RRC connection reestablishment request from the UE. In some examples, the RRC manager 1810 may transmit an RRC connection reestablishment message based on receiving the RRC connection reestablishment request. In some examples, the RRC manager 1810 may receive an RRC connection reestablishment complete message based on transmitting the RRC connection reestablishment message.

[0407] The RLF report manager 1815 may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. In some examples, the RLF report manager 1815 may receive an RLF report from the UE over an RRC connection of a second RAT, the RLF report including information about one or more directional beams associated with the RLF event. In some examples, the RLF report manager 1815 may receive an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. In some examples, the RLF report manager 1815 may receive an RLF report including an indication that the one or more RLF reports are available at the UE, wherein receiving the RLF report is based on receiving the RRC message including the indication. In some examples, the RLF report manager 1815 may transmit an information request message based on receiving the RRC message including the indication, wherein receiving the RLF report is based on transmitting the information request message. In some examples, the RLF report manager 1815 may transmit a handover command to the UE, wherein receiving the RLF report is based on transmitting the handover command. In some cases, the RLF report is part of an information response message received based on transmitting an information request message. In some cases, the RRC message includes an RRC connection reestablishment complete message.

[0408] Based on receiving the RLF report, the RLF message manager 1820 may transmit a message to another node of the network, the message including at least a portion of information regarding one or more directional beams associated with the RLF event. In some examples, the RLF message manager 1820 may transmit the message to a source node associated with the handover of the UE. In some examples, the RLF message manager 1820 may transmit the message to a core network component, wherein the core network component conveys at least some of the information in the message to the source node associated with the handover of the UE. In some examples, the RLF message manager 1820 may transmit the message over an Xn interface. In some examples, the RLF message manager 1820 may transmit the message over an X2 interface. In some examples, the cause of the RLF event is identified as a beam restoration failure, wherein the message indicates that the type of the RLF event includes the beam restoration failure. In some cases, the core network component includes at least one component of the EPC. In some cases, the core network component includes at least one component of the 5GC. In some cases, the message is an RLF indication. In some cases, the message is a handover report. In some cases, the fields of the message include a connection failure type field and are configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof. In some cases, the message includes: identifiers of one or more directional beams associated with the RLF event, beam reference signal received power of one or more directional beams associated with the RLF event, beam measurements of one or more directional beams associated with the RLF event, or a combination thereof.

[0409] The RLF manager 1825 may identify the type of the RLF event. In some examples, the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof. In some examples, the RLF manager 1825 may identify that the cause of the RLF event is a beam recovery failure associated with the first RAT. In some examples, the RLF manager 1825 may select a type of message to transmit based on the identified type of the RLF event, wherein transmitting the message is based on the identified type of the RLF event. The service interruption manager 1830 may identify a duration of the service interruption based on receiving the RLF report, wherein the message indicates the duration of the service interruption.

[0410] The conditional handover manager 1835 may identify the RLF event as associated with a conditional handover failure based on receiving the RLF report, wherein the message includes information about the conditional handover failure. In some examples, the conditional handover manager 1835 may identify the RLF event as associated with a conditional handover failure based on receiving the RLF report, wherein the message includes at least a portion of the information about one or more directional beams associated with the RLF event and the information about the conditional handover failure. In some examples, the conditional handover manager 1835 may transmit the message to a set of candidate target cells associated with the conditional handover, wherein transmitting the message to the other node is based on transmitting the message to the set of candidate target cells. In some examples, the conditional handover manager 1835 may transmit an indication of one or more candidate target cells for the conditional handover, wherein receiving the RLF report is based on transmitting the indication of the one or more candidate target cells for the conditional handover. In some cases, the message includes: the duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

[0411] In some examples, the conditional handover manager 1835 may identify whether the RLF event associated with the conditional handover is based on a too-late handover scenario from a source cell to one of one or more candidate target cells or a wrong cell handover scenario to an incorrect cell, wherein the RLF report may include information indicating whether the RLF event associated with the conditional handover is based on the too-late handover scenario or the wrong cell handover scenario. In some examples, the conditional handover manager 1835 may identify a set of candidate target cells for conditional handover with the UE. In some examples, the conditional handover manager 1835 may transmit a conditional handover request to the set of candidate target cells, wherein transmitting the indication to the UE is based on transmitting the conditional handover request.

[0412] The dual connectivity manager 1840 may identify information about a primary cell and a secondary cell in the dual connectivity configuration based on receiving the RLF report, wherein the message includes the identified information. In some examples, the dual connectivity manager 1840 may transmit the message to an MCG and an SCG in the dual connectivity configuration. In some examples, the dual connectivity manager 1840 may identify measurements for the MCG and measurements for at least one SCG in the dual connectivity configuration based on receiving the RLF report, wherein the message includes the measurements. In some examples, the dual connectivity manager 1840 may identify an RSRP of a last serving cell including the MCG and at least one SCG in the dual connectivity configuration, or an RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof based on receiving the RLF report, wherein the message includes the RSRP or RSRQ or both for the last serving cell. In some examples, the dual connectivity manager 1840 may identify the RSRP of a neighboring cell configured by a primary base station or a secondary base station in the dual connectivity configuration, the RSRQ of the neighboring cell, the frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof based on receiving the RLF report, wherein the message includes the RSRP, RSRQ, frequency, or identifier of the neighboring cell, or a combination thereof.

[0413] In some examples, the dual connectivity manager 1840 may identify the C-RNTIs of the primary base station and at least one secondary base station in the dual connectivity configuration based on receiving the RLF report, wherein the message includes the C-RNTIs of the primary base station and the at least one secondary base station. In some examples, the dual connectivity manager 1840 may identify an identifier of each cell of the primary base station or the secondary base station in the dual connectivity configuration that may be associated with the RLF event based on receiving the RLF report, wherein the message includes the identifier of each cell associated with the RLF event. In some examples, the dual connectivity manager 1840 may identify the identifiers of the primary and secondary cells in the dual connectivity configuration based on receiving the RLF report when the last RRC reconfiguration message including mobility control information is received, wherein the message includes the identifiers. In some cases, the RLF event is for an MCG in the dual connectivity configuration.

[0414] Figure 19A diagram of a system 1900 including a device 1905 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. Device 1905 may be an example of or include components of device 1605, device 1705, or base station 105 as described herein. Device 1905 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communications manager 1910, a network communications manager 1915, a transceiver 1920, an antenna 1925, a memory 1930, a processor 1940, and an inter-station communications manager 1945. These components may be in electronic communication via one or more buses (e.g., bus 1950).

[0415] The communication manager 1910 may reestablish an RRC connection with the UE after an RLF event; receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; and transmit a message to another node of the network based on receiving the RLF report, the message including at least a portion of the information about one or more directional beams associated with the RLF event.

[0416] The network communication manager 1915 can manage communications with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1915 can manage the delivery of data communications for client devices (such as one or more UEs 115). The transceiver 1920 can communicate bidirectionally via one or more antennas, wired, or wireless links, as described above. For example, the transceiver 1920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1920 can also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, as well as demodulate packets received from the antenna.

[0417] In some cases, the wireless device may include a single antenna 1925. However, in some cases, the device may have more than one antenna 1925, which may be capable of transmitting or receiving multiple wireless transmissions concurrently. Memory 1930 may include RAM, ROM, or a combination thereof. Memory 1930 may store computer-readable code 1935 including instructions that, when executed by a processor (e.g., processor 1940), cause the device to perform the various functions described herein. In some cases, memory 1930 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0418] The processor 1940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, the processor 1940 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into the processor 1940. The processor 1940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1930) to cause the device 1905 to perform various functions (e.g., functions or tasks supporting the technology for communicating mobility information).

[0419] The inter-site communication manager 1945 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with the UE 115 in coordination with the other base stations 105. For example, the inter-site communication manager 1945 can coordinate the scheduling of transmissions to the UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1945 can provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0420] The code 1935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1935 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, the code 1935 may not be directly executable by the processor 1940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0421] Figure 20 1. A flow chart illustrating a method 2000 for supporting techniques for communicating mobility information according to aspects of the present disclosure is shown. The operations of the method 2000 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2000 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0422] At 2005, the UE may identify an RLF event associated with the first RAT. The operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0423] At 2010, the UE may reestablish an RRC connection with a cell of the second RAT based on identifying an RLF event associated with the first radio access technology. The operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0424] At 2015, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 2015 may be performed according to the methods described herein. In some examples, aspects of the operations of 2015 may be performed as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0425] Figure 21 1 is a flow chart illustrating a method 2100 that supports techniques for communicating mobility information according to aspects of the present disclosure. The operations of the method 2100 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 2100 may be implemented by the base station 105 or components thereof as described herein. Figures 16 to 19 In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the following functions.

[0426] At 2105, the base station may reestablish an RRC connection with the UE after an RLF event. The RLF event may be associated with a first radio access technology, and the RRC connection may be associated with a second radio access technology. The operations of 2105 may be performed according to the methods described herein. In some examples, aspects of the operations of 2105 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0427] At 2110, the base station may receive an RLF report from the UE over the RRC connection of the second radio access technology, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 2110 may be performed according to the methods described herein. In some examples, aspects of the operations of 2110 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0428] At 2115, the base station may transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about one or more directional beams associated with the RLF event. The operations of 2115 may be performed according to the methods described herein. In some examples, aspects of the operations of 2115 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0429] Figure 22 1. A flow chart illustrating a method 2200 for supporting techniques for communicating mobility information according to aspects of the present disclosure is shown. The operations of the method 2200 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2200 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0430] At 2205, the UE may identify an RLF event. The operations of 2205 may be performed according to the methods described herein. In some examples, aspects of the operations of 2205 may be as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0431] At 2210, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2210 may be performed according to the methods described herein. In some examples, aspects of the operations of 2210 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0432] At 2215, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. The operations of 2215 may be performed according to the methods described herein. In some examples, aspects of the operations of 2215 may be performed as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0433] Figure 23 23. A flow chart illustrating a method 2300 for supporting techniques for communicating mobility information according to aspects of the present disclosure is shown. The operations of the method 2300 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2300 may be implemented by a base station 105 or components thereof as described herein. Figures 16 to 19In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the following functions.

[0434] At 2305, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 2305 may be performed according to the methods described herein. In some examples, aspects of the operations of 2305 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0435] At 2310, the base station may receive an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event. The operations of 2310 may be performed according to the methods described herein. In some examples, aspects of the operations of 2310 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0436] At 2315, the base station may transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about one or more directional beams associated with the RLF event. The operations of 2315 may be performed according to the methods described herein. In some examples, aspects of the operations of 2315 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0437] Figure 24 1. A flow chart illustrating a method 2400 for supporting techniques for communicating mobility information according to aspects of the present disclosure is shown. The operations of the method 2400 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2400 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0438] At 2405, the UE may receive an indication of one or more candidate target cells for conditional handover. The operations of 2405 may be performed according to the methods described herein. In some examples, aspects of the operations of 2405 may be as described with reference to Figures 12 to 15 The described conditional switch manager is used to perform the

[0439] At 2410, the UE may determine that a handover condition is satisfied for at least one of the one or more candidate target cells. The operations of 2410 may be performed according to the methods described herein. In some examples, aspects of the operations of 2410 may be as described with reference to Figures 12 to 15 The described conditional switch manager is used to perform the

[0440] At 2415, the UE may identify an RLF event associated with the conditional handover. The operations of 2415 may be performed according to the methods described herein. In some examples, aspects of the operations of 2415 may be as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0441] At 2420, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2420 may be performed according to the methods described herein. In some examples, aspects of the operations of 2420 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0442] At 2425, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure. The operations of 2425 may be performed according to the methods described herein. In some examples, aspects of the operations of 2425 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0443] Figure 25 1 is a flow chart illustrating a method 2500 for supporting techniques for communicating mobility information according to aspects of the present disclosure. The operations of the method 2500 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 2500 may be implemented by a base station 105 or components thereof as described herein. Figures 16 to 19 In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the following functions.

[0444] At 2505, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 2505 may be performed according to the methods described herein. In some examples, aspects of the operations of 2505 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0445] At 2510, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 2510 may be performed according to the methods described herein. In some examples, aspects of the operations of 2510 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0446] At 2515, the base station may identify the RLF event as being associated with a conditional handover failure based on receiving the RLF report. The operations of 2515 may be performed according to the methods described herein. In some examples, aspects of the operations of 2515 may be as described with reference to Figures 16 to 19 The described conditional switch manager is used to perform the

[0447] At 2520, the base station may transmit a message to another cell of the network based on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional handover failure. The operations of 2520 may be performed according to the methods described herein. In some examples, aspects of the operations of 2520 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0448] Figure 26 1 is a flow chart illustrating a method 2600 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 2600 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2600 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0449] At 2605, the UE may identify an RLF event. The operations of 2605 may be performed according to the methods described herein. In some examples, aspects of the operations of 2605 may be as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0450] At 2610, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2610 may be performed according to the methods described herein. In some examples, aspects of the operations of 2610 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0451] At 2615, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 2615 may be performed according to the methods described herein. In some examples, aspects of the operations of 2615 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0452] Figure 27 1 is a flow chart illustrating a method 2700 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 2700 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2700 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0453] At 2705, the UE may identify a beam recovery failure of at least one directional beam. The operations of 2705 may be performed according to the methods described herein. In some examples, aspects of the operations of 2705 may be performed as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0454] At 2710, the UE may identify an RLF event based on identifying the beam recovery failure. The operations of 2710 may be performed according to the methods described herein. In some examples, aspects of the operations of 2710 may be as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0455] At 2715, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2715 may be performed according to the methods described herein. In some examples, aspects of the operations of 2715 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0456] At 2720, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. In some examples, a field in the RLF report may indicate that the type of RLF event includes a beam recovery failure. The operations of 2720 may be performed according to the methods described herein. In some examples, aspects of the operations of 2720 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0457] Figure 28 1 is a flow chart illustrating a method 2800 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 2800 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2800 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0458] At 2805, the UE may identify an RLF event. The operations of 2805 may be performed according to the methods described herein. In some examples, aspects of the operations of 2805 may be performed as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0459] At 2810, the UE may identify a duration of service interruption based on identifying the RLF event. The operations of 2810 may be performed according to the methods described herein. In some examples, aspects of the operations of 2810 may be as described with reference to Figures 12 to 15 The described service interrupt manager is executed.

[0460] At 2815, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2815 may be performed according to the methods described herein. In some examples, aspects of the operations of 2815 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0461] At 2820, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event. The RLF report may indicate the duration of the service interruption. The operations of 2820 may be performed according to the methods described herein. In some examples, aspects of the operations of 2820 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0462] Figure 29 1 is a flow chart illustrating a method 2900 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 2900 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 2900 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0463] At 2905, the UE may identify an RLF event. The operations of 2905 may be performed according to the methods described herein. In some examples, aspects of the operations of 2905 may be as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0464] At 2910, the UE may identify that the RLF event is associated with a conditional handover failure. The operations of 2910 may be performed according to the methods described herein. In some examples, aspects of the operations of 2910 may be as described with reference to Figures 12 to 15 The described conditional switch manager is used to perform the

[0465] At 2915, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 2915 may be performed according to the methods described herein. In some examples, aspects of the operations of 2915 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0466] At 2920, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and the conditional handover failure. The operations of 2920 may be performed according to the methods described herein. In some examples, aspects of the operations of 2920 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0467] Figure 30 1 is a flow chart illustrating a method 3000 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 3000 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 3000 may be implemented by a UE 115 or components thereof as described herein. Figures 12 to 15 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the following functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the following functions.

[0468] At 3005, the UE may identify information about a primary cell and a secondary cell in a dual connectivity configuration. The RLF report may include the identified information. The operations of 3005 may be performed according to the methods described herein. In some examples, aspects of the operations of 3005 may be as described with reference to Figures 12 to 15 The described dual connectivity manager is implemented.

[0469] At 3010, the UE may identify an RLF event. The operations of 3010 may be performed according to the methods described herein. In some examples, aspects of the operations of 3010 may be performed as described with reference to Figures 12 to 15 The RLF manager described is executed.

[0470] At 3015, the UE may reestablish an RRC connection with the cell based on identifying the RLF event. The operations of 3015 may be performed according to the methods described herein. In some examples, aspects of the operations of 3015 may be as described with reference to Figures 12 to 15 The RRC manager described is executed.

[0471] At 3020, the UE may transmit an RLF report to the cell based on reestablishing the RRC connection, the RLF report including the identified information and information about one or more directional beams associated with the RLF event. The operations of 3020 may be performed according to the methods described herein. In some examples, aspects of the operations of 3020 may be as described with reference to Figures 12 to 15 The RLF reporting manager described is executed.

[0472] Figure 31 1 is a flow chart illustrating a method 3100 that supports techniques for communicating mobility information according to one or more aspects of the present disclosure. The operations of the method 3100 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 3100 may be implemented by the base station 105 or components thereof as described herein. Figures 16 to 19 In some examples, base station 105 may be an example of a cell, a node, a cell cluster, or any combination thereof. In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0473] At 3105, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 3105 may be performed according to the methods described herein. In some examples, aspects of the operations of 3105 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0474] At 3110, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 3110 may be performed according to the methods described herein. In some examples, aspects of the operations of 3110 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0475] At 3115, the base station may transmit a message to another node of the network based on receiving the RLF report, the message including at least a portion of the information about one or more directional beams associated with the RLF event. The operations of 3115 may be performed according to the methods described herein. In some examples, aspects of the operations of 3115 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0476] Figure 32 A flow chart illustrating a method 3200 that supports techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. The operations of the method 3200 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 3200 may be implemented by the base station 105 or components thereof as described herein. Figures 16 to 19 In some examples, base station 105 may be an example of a cell, a node, a cell cluster, or any combination thereof. In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0477] At 3205, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 3205 may be performed according to the methods described herein. In some examples, aspects of the operations of 3205 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0478] At 3210, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 3210 may be performed according to the methods described herein. In some examples, aspects of the operations of 3210 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0479] At 3215, the base station may transmit a message to a source node of a network associated with the handover of the UE based on receiving the RLF report, the message including at least a portion of information about one or more directional beams associated with the RLF event. The operations of 3215 may be performed according to the methods described herein. In some examples, aspects of the operations of 3215 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0480] Figure 33A flow chart illustrating a method 3300 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. The operations of the method 3300 may be implemented by a base station 105 or components thereof as described herein. In some examples, the operations of the method 2700 may be implemented by a cell, a node, a cell group, or any combination thereof. For example, the operations of the method 3300 may be implemented by a cell, a node, a cell group, or any combination thereof as described with reference to FIG. Figures 16 to 19 In some examples, base station 105 may be an example of a cell, a node, a cell cluster, or any combination thereof. In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0481] At 3305, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 3305 may be performed according to the methods described herein. In some examples, aspects of the operations of 3305 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0482] At 3310, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 3310 may be performed according to the methods described herein. In some examples, aspects of the operations of 3310 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0483] At 3315, the base station may transmit a message to a core network component of the network based on receiving the RLF report, the message including at least a portion of information about one or more directional beams associated with the RLF event. The core network component may convey at least some of the information in the message to a source node associated with the handover of the UE. The operations of 3315 may be performed according to the methods described herein. In some examples, aspects of the operations of 3315 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0484] Figure 34 A flow chart illustrating a method 3400 supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. The operations of the method 3400 may be implemented by a base station 105 or components thereof as described herein. In some examples, the operations of the method 2800 may be implemented by a cell, a node, a cell group, or any combination thereof. For example, the operations of the method 3400 may be implemented by a cell, a node, a cell group, or any combination thereof as described with reference to FIG. Figures 16 to 19In some examples, base station 105 may be an example of a cell, a node, a cell cluster, or any combination thereof. In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0485] At 3405, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 3405 may be performed according to the methods described herein. In some examples, aspects of the operations of 3405 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0486] At 3410, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 3410 may be performed according to the methods described herein. In some examples, aspects of the operations of 3410 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0487] At 3415, the base station may identify the RLF event as being associated with a conditional handover failure based on receiving the RLF report. The operations of 3415 may be performed according to the methods described herein. In some examples, aspects of the operations of 3415 may be as described with reference to Figures 16 to 19 The described conditional switch manager is used to perform the

[0488] At 3420, the base station may transmit a message to another node of the network based on receiving the RLF report, the message including information about the conditional handover failure and at least a portion of information about one or more directional beams associated with the RLF event. The operations of 3420 may be performed according to the methods described herein. In some examples, aspects of the operations of 3420 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0489] Figure 35 A flow chart illustrating a method 3500 for supporting techniques for communicating mobility information according to one or more aspects of the present disclosure is shown. The operations of the method 3500 may be implemented by a base station 105 or components thereof as described herein. In some examples, the operations of the method 2900 may be implemented by a cell, a node, a cell group, or any combination thereof. For example, the operations of the method 3500 may be implemented by a cell, a node, a cell group, or any combination thereof as described with reference to FIG. Figures 16 to 19In some examples, base station 105 may be an example of a cell, a node, a cell cluster, or any combination thereof. In some examples, a base station may execute an instruction set to control functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0490] At 3505, the base station may reestablish an RRC connection with the UE after the RLF event. The operations of 3505 may be performed according to the methods described herein. In some examples, aspects of the operations of 3505 may be as described with reference to Figures 16 to 19 The RRC manager described is executed.

[0491] At 3510, the base station may receive an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event. The operations of 3510 may be performed according to the methods described herein. In some examples, aspects of the operations of 3510 may be performed as described with reference to Figures 16 to 19 The RLF reporting manager described is executed.

[0492] At 3515, the base station may identify information about the primary cell and the secondary cell in the dual connectivity configuration based on receiving the RLF report. The operations of 3515 may be performed according to the methods described herein. In some examples, aspects of the operations of 3515 may be as described with reference to Figures 16 to 19 The described dual connectivity manager is implemented.

[0493] At 3520, the base station may transmit a message to another node of the network based on receiving the RLF report, the message including the identified information and at least a portion of the information about one or more directional beams associated with the RLF event. The operations of 3520 may be performed according to the methods described herein. In some examples, aspects of the operations of 3520 may be performed as described with reference to Figures 16 to 19 The RLF message manager described is executed.

[0494] It should be noted that the methods described herein describe possible implementations, and that the operations and functions may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0495] Example 1: A method for wireless communication, comprising: identifying an RLF event associated with a first RAT; re-establishing an RRC connection with a cell of a second RAT based on identifying the RLF event associated with the first RAT; and transmitting an RLF report to the cell based at least in part on re-establishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event.

[0496] Example 2: The method of Example 1, further comprising identifying a beam restoration failure of at least one directional beam associated with the first RAT, wherein identifying the RLF event is based at least in part on identifying the beam restoration failure.

[0497] Example 3: The method of any of Examples 1 or 2, wherein the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0498] Example 4: The method of any one of Examples 1-3, wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0499] Example 5: The method of any of Examples 1-4, further comprising identifying a duration of the service interruption based at least in part on identifying the RLF event, wherein the RLF report indicates the duration of the service interruption.

[0500] Example 6: A method as described in Example 5, wherein identifying the duration further includes: identifying the duration between a first time when the UE loses data transmission capability at a source cellular cell of a first RAT and a second time when the UE is able to resume data transmission at the cellular cell, wherein the cellular cell has a second RAT.

[0501] Example 7: The method of Example 5, wherein identifying the duration further comprises identifying the duration between a time when a user equipment (UE) receives a handover command from a source cell and a time when the UE transmits an RRC reconfiguration complete message to the cell.

[0502] Example 8: The method of Example 5, wherein when dual connectivity is configured, the duration is identified for each of the primary cell and the secondary cell.

[0503] Example 9: A method as described in any of Examples 1-8, wherein the RLF report includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0504] Example 10: The method of any one of Examples 1-9, further comprising: identifying that the RLF event is associated with a conditional handover failure, wherein the RLF report includes information about the conditional handover failure.

[0505] Example 11: A method as described in Example 10, wherein the RLF report includes: the duration between the last handover initialization and the connection failure, a list of candidate target cellular cells including at least the cellular cell, measurement information for at least one target cellular cell in the candidate target cellular cell list, an indication of one or more target cellular cells attempted to connect to after the RLF event occurred, the number of connection attempts made after the RLF event occurred, or a combination thereof.

[0506] Example 12: The method of Example 10, further comprising: receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells, the at least one candidate target cell including the cell; and initiating a RACH to at least one candidate target cell that satisfies the handover condition, wherein identifying that the RLF event is associated with the conditional handover failure is based at least in part on initiating the RACH to the at least one candidate target cell.

[0507] Example 13: The method of any of Examples 1-12, further comprising identifying information about a primary cell and a secondary cell in a dual connectivity configuration, wherein the RLF report includes the identified information.

[0508] Example 14: The method of any one of Examples 1-13, wherein the RLF event is for an MCG in a dual connectivity configuration.

[0509] Example 15: The method of any one of Examples 1-14, further comprising: identifying measurements for an MCG and measurements for at least one SCG in a dual connectivity configuration, wherein the RLF report includes the measurements.

[0510] Example 16: The method as described in any one of Examples 1-15 further includes: identifying the RSRP of the last serving cell including the MCG and at least one SCG in the dual connectivity configuration, or the RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the RLF report includes the RSRP or RSRQ or both for the last serving cell.

[0511] Example 17: The method as described in any one of Examples 1-16 further includes: identifying the RSRP of a neighboring cellular cell configured by a primary base station or a secondary base station in a dual connectivity configuration, the RSRQ of the neighboring cellular cell, the frequency of the neighboring cellular cell, or the identifier of the neighboring cellular cell, or a combination thereof, wherein the RLF report includes the RSRP, RSRQ, frequency, or identifier, or a combination thereof, of the neighboring cellular cell.

[0512] Example 18: The method as described in any one of Examples 1-17 further includes: identifying the C-RNTI of the primary base station and at least one secondary base station in the dual connectivity configuration, wherein the RLF report includes the C-RNTI of the primary base station and the at least one secondary base station.

[0513] Example 19: The method as described in any one of Examples 1-18 further includes: identifying an identifier of each cellular cell associated with the RLF event of a primary base station or a secondary base station in a dual connectivity configuration, wherein the RLF report includes an identifier of each cellular cell associated with the RLF event.

[0514] Example 20: The method of any one of Examples 1-19, further comprising: identifying an identifier of a primary and secondary cell in the dual connectivity configuration when a last RRC reconfiguration message including mobility control information is received, wherein the RLF report includes the identifier.

[0515] Example 21: The method of any of Examples 1-20, further comprising: identifying whether the type of handover is an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover.

[0516] Example 22: A method as described in any one of Examples 1-21, wherein reestablishing the RRC connection further includes: transmitting an RRC connection reconstruction request; receiving an RRC connection reconstruction message based at least in part on transmitting the RRC connection reconstruction request; and transmitting an RRC connection reconstruction completion message based at least in part on receiving the RRC connection reconstruction message.

[0517] Example 23: The method as described in any of Examples 1-22 further includes: transmitting an RRC message including an indication that one or more RLF reports are available for reporting to the network, wherein transmitting the RLF report is at least partially based on transmitting the RRC message including an indication that the one or more RLF reports are available for reporting to the network.

[0518] Example 24: The method as described in Example 23 further includes: receiving an information request message based at least in part on transmitting the RRC message including an indication that the one or more RLF reports are available for reporting to the network, wherein transmitting the RLF report is based at least in part on receiving the information request message.

[0519] Example 25: The method of Example 24, wherein the RLF report is part of an information response message transmitted based at least in part on receiving the information request message.

[0520] Example 26: The method of Example 23, wherein the RRC message includes an RRC connection reestablishment complete message.

[0521] Example 27: The method of any of Examples 1-26, further comprising performing a handover between the source cell and the cell, wherein identifying the RLF event is based at least in part on performing the handover.

[0522] Example 28: The method of any one of Examples 1-27, wherein the RLF report includes: the transmission power of the preamble, the number of attempts to successfully send the preamble, the number of transmissions performed before receiving an acknowledgment that the preamble was received, RSRP, or L1 RSRP, or a combination thereof.

[0523] Example 29: The method of any one of Examples 1-28, wherein the preamble is a RACH preamble.

[0524] Example 30: The method of any of Examples 1-29, wherein the first RAT is associated with a 5GC and the RAT is associated with an EPC.

[0525] Example 31: A method for wireless communication, comprising: reestablishing an RRC connection with a UE after an RLF event, wherein the RLF event is associated with a first radio access technology and the RRC connection is associated with a second radio access technology; receiving an RLF report from the UE on the RRC connection of the second radio access technology, the RLF report including information about one or more directional beams associated with the RLF event; and transmitting a message to another cellular cell of a network based at least in part on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0526] Example 32: The method of Example 31, wherein transmitting the message to another cell comprises transmitting the message to a source cell associated with a handover of the UE.

[0527] Example 33: A method as described in any of Examples 31 or 32, wherein transmitting the message to another cellular cell includes: transmitting the message to a core network component, wherein the core network component conveys at least some of the information in the message to the source cellular cell associated with the handover of the UE.

[0528] Example 34: The method of Example 33, wherein the core network component includes at least one component of an EPC.

[0529] Example 35: A method as described in Example 33, wherein the core network component includes at least one component of 5GC.

[0530] Example 36: A method as described in any of Examples 31-35, wherein the first radio access technology is associated with 5GC and the second radio access technology is associated with EPC.

[0531] Example 37: The method of any of Examples 31-36 further includes: identifying the type of the RLF event; and selecting the type of message to transmit based at least in part on identifying the type of the RLF event, wherein transmitting the message is based at least in part on identifying the type of the RLF event.

[0532] Example 38: The method of any of Examples 31-37, wherein the message is a RLF indication.

[0533] Example 39: The method of any of Examples 31-37, wherein the message is a handover report.

[0534] Example 40: The method of any of Examples 31-39, wherein transmitting the message to another cell comprises transmitting the message over an Xn interface.

[0535] Example 41: The method of any of Examples 31-39, wherein transmitting the message to another cell comprises transmitting the message over an X2 interface.

[0536] Example 42: The method of any one of Examples 31-41, further comprising: identifying that the cause of the RLF event is a beam recovery failure associated with the first radio access technology, wherein the message indicates that the type of the RLF event includes the beam recovery failure.

[0537] Example 43: The method of Example 42, wherein the message includes a connection failure type indication and is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0538] Example 44: The method of Example 42, wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

[0539] Example 45: The method of any of Examples 31-44, further comprising identifying a duration of the service interruption based at least in part on receiving the RLF report, wherein the message indicates the duration of the service interruption.

[0540] Example 46: A method as described in any of Examples 31-45, wherein the message includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0541] Example 47: The method of any of Examples 31-46, further comprising identifying that the RLF event is associated with a conditional handover failure based at least in part on receiving the RLF report, wherein the message includes information about the conditional handover failure.

[0542] Example 48: The method of Example 47, wherein transmitting the message to another cell includes transmitting the message to a plurality of candidate target cells associated with conditional switching, wherein transmitting the message to another cell is based at least in part on transmitting the message to the plurality of candidate target cells.

[0543] Example 49: A method as described in Example 47, wherein the message includes: the duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt to connect to after the RLF event occurs, the number of connection attempts made after the RLF event occurs, or a combination thereof.

[0544] Example 50: The method of Example 47, further comprising: transmitting an indication of one or more candidate target cells for conditional handover, wherein receiving the RLF report is based at least in part on transmitting the indication of one or more candidate target cells for the conditional handover.

[0545] Example 51: The method of any of Examples 31-50, further comprising identifying information about a primary cell and a secondary cell in a dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the identified information.

[0546] Example 52: The method of any of Examples 31-51, wherein transmitting the message to another cell comprises transmitting the message to an MCG and an SCG in a dual connectivity configuration.

[0547] Example 53: The method of any of Examples 31-52, wherein the RLF event is for an MCG in a dual connectivity configuration.

[0548] Example 54: The method of any of Examples 31-53, further comprising identifying measurements for the MCG and measurements for at least one SCG in the dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the measurements.

[0549] Example 55: The method as described in any of Examples 31-54 further includes: identifying the RSRP of the last serving cell including the MCG and at least one SCG in the dual connectivity configuration, or the RSRQ of the last serving cell in the dual connectivity configuration, or a combination thereof, based at least in part on receiving the RLF report, wherein the message includes the RSRP or RSRQ or both for the last serving cell.

[0550] Example 56: The method as described in any of Examples 31-55 further includes: identifying the RSRP of a neighboring cell configured by a primary base station or a secondary base station in a dual connectivity configuration, the RSRQ of the neighboring cell, the frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, based at least in part on receiving the RLF report, wherein the message includes the RSRP, RSRQ, frequency, or identifier, or a combination thereof, of the neighboring cell.

[0551] Example 57: The method as described in any one of Examples 31-456 further includes: identifying the C-RNTI of the primary base station and at least one secondary base station in the dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the C-RNTI of the primary base station and the at least one secondary base station.

[0552] Example 58: The method described in any of Examples 31-57 further includes: identifying an identifier of each cellular cell associated with the RLF event of the primary base station or the secondary base station in the dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes an identifier of each cellular cell associated with the RLF event.

[0553] Example 59: The method as described in any of Examples 31-58 further includes: when a last RRC reconfiguration message including mobility control information is received, identifying the identifier of the primary and secondary cellular cells in the dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the identifier.

[0554] Example 60: A method as described in any of Examples 31-59, wherein reestablishing the RRC connection further includes: receiving an RRC connection reestablishment request from the UE; sending an RRC connection reestablishment message based at least in part on receiving the RRC connection reestablishment request; and receiving an RRC connection reestablishment completion message based at least in part on transmitting the RRC connection reestablishment message.

[0555] Example 61: The method as described in any of Examples 31-60 further includes: receiving an RRC message including an indication that one or more RLF reports are available at the UE, wherein receiving the RLF report is at least partially based on receiving the RRC message including an indication that the one or more RLF reports are available at the UE.

[0556] Example 62: The method as described in Example 61 further includes: transmitting an information request message based at least in part on receiving the RRC message including an indication that the one or more RLF reports are available at the UE, wherein receiving the RLF report is based at least in part on transmitting the information request message.

[0557] Example 63: The method of Example 62, wherein the RLF report is part of an information response message received based at least in part on transmitting the information request message.

[0558] Example 64: The method of Example 61, wherein the RRC message includes an RRC connection reestablishment complete message.

[0559] Example 65: The method of any of Examples 31-64, further comprising transmitting a handover command to the UE, wherein receiving the RLF report is based at least in part on transmitting the handover command.

[0560] Example 66: A method for wireless communication, comprising: identifying an RLF event; re-establishing an RRC connection with a cellular cell based at least in part on identifying the RLF event; and transmitting an RLF report to the cellular cell based at least in part on re-establishing the RRC connection, the RLF report including a connection failure type indication indicating that the RLF event is a beam recovery failure and information about one or more directional beams associated with the RLF event.

[0561] Example 67: The method of Example 66, further comprising: identifying a beam restoration failure of at least one directional beam, wherein identifying the RLF event is based at least in part on identifying the beam restoration failure.

[0562] Example 68: The method of any of Examples 66 or 67, wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

[0563] Example 69: A method as described in any of Examples 66-68, wherein the RLF report includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0564] Example 70: The method of any of Examples 66-69, further comprising identifying whether the type of handover is an inter-RAT handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of handover.

[0565] Example 71: A method as described in any of Examples 66-70, wherein reestablishing the RRC connection further includes: transmitting an RRC connection reestablishment request; receiving an RRC connection reestablishment message based at least in part on transmitting the RRC connection reestablishment request; and transmitting an RRC connection reestablishment completion message based at least in part on receiving the RRC connection reestablishment message.

[0566] Example 72: The method of any of Examples 66-71, further comprising: transmitting an RRC message including an indication that one or more RLF reports are available for reporting to a network, wherein transmitting the RLF report is based at least in part on transmitting the RRC message including an indication that the one or more RLF reports are available for reporting to the network.

[0567] Example 73: The method as described in Example 72 further includes: receiving an information request message based at least in part on transmitting the RRC message including an indication that the one or more RLF reports are available for reporting to the network, wherein transmitting the RLF report is based at least in part on receiving the information request message.

[0568] Example 74: The method of Example 73, wherein the RLF report is part of an information response message transmitted based at least in part on receiving the information request message.

[0569] Example 75: A method for wireless communication, comprising: reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including a connection failure type indication indicating that the RLF event was a beam recovery failure and information about one or more directional beams associated with the RLF event; and transmitting a message to another cellular cell of a network based at least in part on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event.

[0570] Example 76: The method of Example 75, wherein transmitting the message to another cell comprises transmitting the message to a source cell associated with a handover of the UE.

[0571] Example 77: A method as described in any of Examples 75 or 76, wherein transmitting the message to another cellular cell includes: transmitting the message to a core network component, wherein the core network component conveys at least some of the information in the message to the source cellular cell associated with the handover of the UE.

[0572] Example 78: The method of Example 77, wherein the core network component includes at least one component of an EPC.

[0573] Example 79: A method as described in Example 77, wherein the core network component includes at least one component of 5GC.

[0574] Example 80: The method of any of Examples 75-79 further includes: identifying the type of the RLF event; and selecting the type of message to transmit based at least in part on identifying the type of the RLF event, wherein transmitting the message is based at least in part on identifying the type of the RLF event.

[0575] Example 81: The method of any of Examples 75-80, wherein the message is a RLF indication.

[0576] Example 82: The method of any of Examples 75-80, wherein the message is a handover report.

[0577] Example 83: The method of any of Examples 75-82, wherein transmitting the message to another cell comprises transmitting the message over an Xn interface.

[0578] Example 84: The method of any of Examples 75-82, wherein transmitting the message to another cell comprises transmitting the message over an X2 interface.

[0579] Example 85: A method for wireless communication, comprising: receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells; identifying a RLF event associated with the conditional handover; re-establishing an RRC connection with the cell based at least in part on identifying the RLF event; and transmitting an RLF report to the cell based at least in part on re-establishing the RRC connection, the RLF report including information about one or more directional beams associated with the RLF event and information about a conditional handover failure.

[0580] Example 86: The method of Example 85, further comprising: initiating a RACH to at least one candidate target cell that meets the handover condition, wherein identifying that the RLF event is associated with the conditional handover failure is based at least in part on initiating the RACH to the at least one candidate target cell.

[0581] Example 87: The method as described in Example 86 further includes: measuring one or more characteristics associated with the one or more candidate target cells; and determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy one or more thresholds, wherein determining that the switching condition is met is at least partially based on determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy the one or more thresholds.

[0582] Example 88: The method of any of Examples 85-87, wherein transmitting the RLF report further comprises transmitting the RLF report to a plurality of candidate target cells.

[0583] Example 89: The method as described in any one of Examples 85-88 further includes: identifying whether the RLF event associated with the conditional handover is at least partially based on a too-late handover scenario from the source cell to one of the one or more candidate target cells or an erroneous cell handover scenario to an erroneous cell, wherein the RLF report includes information indicating whether the RLF event associated with the conditional handover is at least partially based on the too-late handover scenario or the erroneous cell handover scenario.

[0584] Example 90: A method as described in any of Examples 85-89, wherein the RLF report includes: the duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells attempted to connect after the RLF event occurred, the number of connection attempts made after the RLF event occurred, or a combination thereof.

[0585] Example 91: The method of any of Examples 85-90, further comprising: identifying a beam recovery failure of at least one directional beam associated with the conditional handover, wherein identifying the RLF event is based at least in part on identifying the beam recovery failure.

[0586] Example 92: The method of any of Examples 85-91, wherein the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

[0587] Example 93: A method as described in any of Examples 85-92, wherein the RLF report includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0588] Example 94: A method for wireless communication, comprising: reestablishing an RRC connection with a UE after an RLF event; receiving an RLF report from the UE, the RLF report including information about one or more directional beams associated with the RLF event; identifying that the RLF event is associated with a conditional switching failure based at least in part on receiving the RLF report; and transmitting a message to another cell of a network based at least in part on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and information about the conditional switching failure.

[0589] Example 95: A method as described in Example 94, wherein transmitting the message to another cellular cell includes: transmitting the message to multiple candidate target cellular cells associated with conditional switching, wherein transmitting the message to another cellular cell is at least partially based on transmitting the message to the multiple candidate target cellular cells.

[0590] Example 96: A method as described in any of Examples 94 or 95, wherein the message includes: the duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt to connect to after the RLF event occurs, the number of connection attempts made after the RLF event occurs, or a combination thereof.

[0591] Example 97: The method as described in any one of Examples 94-96 further includes: identifying whether the RLF event associated with the conditional handover is at least partially based on a too-late handover scenario from the source cell to one of one or more candidate target cells or an erroneous cell handover scenario to an erroneous cell, wherein the RLF report includes information indicating whether the RLF event associated with the conditional handover is at least partially based on the too-late handover scenario or the erroneous cell handover scenario.

[0592] Example 98: The method of any one of Examples 94-97 further includes: transmitting an indication of one or more candidate target cells for conditional switching to the UE, wherein receiving the RLF report is at least partially based on transmitting the indication of the one or more candidate target cells for the conditional switching.

[0593] Example 99: The method as described in Example 98 further includes: identifying multiple candidate target cells for the conditional switching with the UE; transmitting a conditional switching request to the multiple candidate target cells, wherein the indication of the one or more candidate target cells for the conditional switching is transmitted to the UE at least in part based on transmitting the conditional switching request.

[0594] Example 100: The method as described in any of Examples 94-99 further includes: identifying the type of the RLF event; and selecting the type of message to be transmitted based at least in part on the identification of the type of the RLF event, wherein transmitting the message is based at least in part on the identification of the type of the RLF event.

[0595] Example 101: The method of any of Examples 94-100, wherein the message is a RLF indication.

[0596] Example 102: The method of any of Examples 94-100, wherein the message is a handover report.

[0597] Example 103: The method of any of Examples 94-102, wherein transmitting the message to another cell comprises transmitting the message over an Xn interface.

[0598] Example 104: The method of any of Examples 94-102, wherein transmitting the message to another cell comprises transmitting the message over an X2 interface.

[0599] Example 105: A method as described in any of Examples 94-105, wherein the message includes: an identifier of one or more directional beams associated with the RLF event, a beam reference signal received power of one or more directional beams associated with the RLF event, a beam measurement of one or more directional beams associated with the RLF event, or a combination thereof.

[0600] The techniques described herein can be used in various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, single-carrier frequency division multiple access (SC-FDMA), and other systems. CDMA systems can implement radio technologies such as CDMA2000 and Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95, and IS-856 standards. IS-2000 versions are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. TDMA systems can implement radio technologies such as Global System for Mobile Communications (GSM).

[0601] OFDMA systems can implement radio technologies such as Ultra Mobile Broadband (UMB), E-UTRA, Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and others. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE, LTE-A, and LTE-A Pro are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, LTE-A Pro, NR, and GSM are described in documents from an organization called the 3rd Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called the 3rd Generation Partnership Project 2 (3GPP2). The techniques described herein may be used for the systems and radio technologies mentioned herein as well as for other systems and radio technologies. Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein may also be applicable to applications other than LTE, LTE-A, LTE-A Pro, or NR applications.

[0602] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with a network provider. A small cell may be associated with a lower-power base station (compared to a macro cell), and may operate in the same or different frequency bands (e.g., licensed, unlicensed, etc.) as the macro cell. According to various examples, small cells may include pico cells, femto cells, and micro cells. A pico cell, for example, may cover a smaller geographic area and may allow unrestricted access by UEs with service subscriptions with a network provider. A femto cell may also cover a smaller geographic area (e.g., a residence) and may provide restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in the residence, etc.). An eNB for a macro cell may be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or more (e.g., two, three, four, etc.) cells and may also support communications using one or more component carriers. A gNB for a macro cell may be referred to as a macro gNB. A gNB for a small cell may be referred to as a small cell gNB, pico gNB, femto gNB...

Claims

1. A method for wireless communication, comprising: identifying a radio link failure (RLF) event associated with a first radio access technology between a user equipment (UE) and a network device; re-establishing a radio resource control (RRC) connection with a cell of a second radio access technology based at least in part on identifying the RLF event associated with the first radio access technology; transmitting an RRC message including an indication that one or more RLF reports are available for reporting to a network; as well as transmitting, to the cell, an RLF report based at least in part on reestablishing the RRC connection and based at least in part on transmitting the RRC message including the indication that the one or more RLF reports are available for reporting to the network, the RLF report including a field containing an indication of a cause of the RLF event and including information about one or more directional beams associated with the RLF event, the indication indicating that the RLF event is a beam recovery failure between the UE and the network device, wherein the RLF report further comprises one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further comprises an indication of a first duration of a first service interruption of a primary node associated with the MCG and an indication of a second duration of a second service interruption of a secondary node associated with an SCG in the at least one SCG based at least in part on the RLF event.

2. The method of claim 1, further comprising: A beam restoration failure of at least one directional beam associated with the first radio access technology is identified, wherein identifying the RLF event is based at least in part on identifying the beam restoration failure.

3. The method of claim 1 , wherein the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

4. The method of claim 1 , wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

5. The method of claim 1, further comprising: A duration of a service interruption is identified based at least in part on identifying the RLF event, wherein the RLF report indicates the duration of the service interruption.

6. The method of claim 5, wherein identifying the duration further comprises: A duration is identified between a first time when a user equipment (UE) loses data transmission capability at a source cell of the first radio access technology and a second time when the UE is able to resume data transmission at the cell, wherein the cell has the second radio access technology.

7. The method of claim 5, wherein identifying the duration further comprises: A duration is identified between a first time when a user equipment (UE) receives a handover command from a source cell and a second time when the UE transmits an RRC reconfiguration complete message to the cell.

8. The method of claim 5, wherein when dual connectivity is configured, the duration is identified for each of a primary cell and a secondary cell.

9. The method of claim 1 , wherein the RLF report comprises: An identifier of the one or more directional beams associated with the RLF event, a beam reference signal received power of the one or more directional beams associated with the RLF event, a beam measurement of the one or more directional beams associated with the RLF event, or a combination thereof.

10. The method of claim 1, further comprising: It is identified that the RLF event is associated with a conditional handover failure, wherein the RLF report includes information about the conditional handover failure.

11. The method of claim 10, wherein the RLF report comprises: The duration between the last handover initialization and the connection failure, a list of candidate target cells including at least the cell, measurement information for at least one target cell in the candidate target cell list, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

12. The method of claim 10, further comprising: receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells, the at least one candidate target cell including the cell; as well as A random access channel (RACH) is initiated toward the at least one candidate target cell that meets the handover condition, wherein identifying that the RLF event is associated with the conditional handover failure is based at least in part on initiating the RACH toward the at least one candidate target cell.

13. The method of claim 1, further comprising: Information about a primary cell and a secondary cell in the MCG and the SCG in the dual connectivity configuration is identified, wherein the RLF report includes the identified information.

14. The method of claim 1, wherein the RLF event is for the MCG in the dual connectivity configuration.

15. The method of claim 1, further comprising: Identifying measurements for the MCG and measurements for the at least one SCG in the dual connectivity configuration, wherein the RLF report includes the measurements.

16. The method of claim 1, further comprising: The identification includes a reference signal received power (RSRP) of the last serving cell of the MCG and the at least one SCG in the dual connectivity configuration, or a reference signal received quality (RSRQ) of the last serving cell in the dual connectivity configuration, or a combination thereof, wherein the RLF report includes the RSRP or the RSRQ or both for the last serving cell.

17. The method of claim 1, further comprising: Identifying a reference signal received power (RSRP) of a neighboring cell configured by a primary network device or a secondary network device in a dual connectivity configuration, a reference signal received quality (RSRQ) of the neighboring cell, a frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof, wherein the RLF report includes the RSRP, the RSRQ, the frequency, or the identifier, or a combination thereof, of the neighboring cell.

18. The method of claim 1, further comprising: Identifying cell radio network temporary identifiers (C-RNTIs) of a primary network device and at least one secondary network device in a dual connectivity configuration, wherein the RLF report includes the C-RNTIs of the primary network device and the at least one secondary network device.

19. The method of claim 1, further comprising: Identifying an identifier of each cell associated with the RLF event for a primary network device or a secondary network device in a dual connectivity configuration, wherein the RLF report includes the identifier of each cell associated with the RLF event.

20. The method of claim 1, further comprising: When a last RRC reconfiguration message including mobility control information is received, identifiers of primary and secondary cells in the dual connectivity configuration are identified, wherein the RLF report includes the identifiers.

21. The method of claim 1, further comprising: Identifying whether a type of handover is an inter-radio access technology (RAT) handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of the handover.

22. The method of claim 1 , wherein reestablishing the RRC connection further comprises: Sending RRC connection reestablishment request; receiving an RRC connection reestablishment message based at least in part on transmitting the RRC connection reestablishment request; as well as An RRC connection reestablishment complete message is transmitted based at least in part on receiving the RRC connection reestablishment message.

23. The method of claim 1, wherein the indication that the one or more RLF reports are available for reporting to the network comprises a flag in an RRC Connection Setup Complete message, and wherein the RRC message comprises the RRC Connection Setup Complete message.

24. The method of claim 23, further comprising: An information request message is received based at least in part on transmitting the RRC message including the indication, wherein transmitting the RLF report is based at least in part on receiving the information request message.

25. The method of claim 24, wherein the RLF report is part of an information response message transmitted based at least in part on receiving the information request message.

26. The method of claim 23, wherein the RRC message comprises an RRC connection reestablishment complete message.

27. The method of claim 1, further comprising: A handover is performed between a source cell and the cell, wherein identifying the RLF event is based at least in part on performing the handover.

28. The method of claim 1, wherein the RLF report comprises: The transmission power of the preamble, the number of attempts to successfully send the preamble, the number of transmissions made before receiving an acknowledgment that the preamble was received, Reference Signal Received Power (RSRP), or Layer 1 (L1) RSRP, or a combination thereof.

29. The method of claim 28, wherein the preamble is a random access channel (RACH) preamble.

30. The method of claim 1, wherein the first radio access technology is associated with a 5G core network (5GC) and the second radio access technology is associated with an evolved packet core (EPC).

31. A method for wireless communication, comprising: re-establishing a radio resource control (RRC) connection with a user equipment (UE) and a network device following a radio link failure (RLF) event between the UE and a network device, wherein the RLF event is associated with a first radio access technology and the RRC connection is associated with a second radio access technology; receiving an RRC message including an indication that one or more RLF reports are available for reporting to a network; receiving, from the UE, an RLF report over the RRC connection for the second radio access technology and based at least in part on receiving the RRC message including the indication that the one or more RLF reports are available for reporting to the network, the RLF report including a field containing an indication of a cause of the RLF event and including information about one or more directional beams associated with the RLF event, the indication indicating that the RLF event is a beam restoration failure between the UE and the network device, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes an indication of a first duration of a first service outage for a primary node associated with the MCG and an indication of a second duration of a second service outage for a secondary node associated with an SCG in the at least one SCG based at least in part on the RLF event; as well as A message is transmitted to another cell of the network based at least in part on receiving the RLF report, the message including at least a portion of the information regarding the one or more directional beams associated with the RLF event.

32. The method of claim 31 , wherein transmitting the message to the other cell comprises: The message is transmitted to a source cell associated with a handover of the UE.

33. The method of claim 31 , wherein transmitting the message to the other cell comprises: The message is transmitted to a core network component, wherein the core network component conveys at least some of the information in the message to a source cell associated with a handover of the UE.

34. The method of claim 33, wherein the core network component comprises at least one component of an Evolved Packet Core (EPC).

35. The method of claim 33, wherein the core network component comprises at least one component of a 5G core network (5GC).

36. The method of claim 31 , wherein the first radio access technology is associated with a 5G core network (5GC) and the second radio access technology is associated with an evolved packet core (EPC).

37. The method of claim 31 , further comprising: Identify the type of the RLF event; as well as The type of the message to be transmitted is selected based at least in part on identifying the type of the RLF event, wherein transmitting the message is based at least in part on identifying the type of the RLF event.

38. The method of claim 31 , wherein the message is a RLF indication.

39. The method of claim 31 , wherein the message is a handover report.

40. The method of claim 31 , wherein transmitting the message to the other cell comprises: The message is transmitted on the Xn interface.

41. The method of claim 31 , wherein transmitting the message to the other cell comprises: The message is transmitted on the X2 interface.

42. The method of claim 31 , further comprising: The cause of the RLF event is identified as a beam restoration failure associated with the first radio access technology, wherein the message indicates that a type of the RLF event includes the beam restoration failure.

43. The method of claim 42, wherein the message includes a connection failure type indication and is configured to indicate whether the RLF event is a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

44. The method of claim 42, wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

45. The method of claim 31 , further comprising: A duration of a service outage is identified based at least in part on receiving the RLF report, wherein the message indicates the duration of the service outage.

46. ​​The method of claim 31 , wherein the message comprises an identifier of the one or more directional beams associated with the RLF event, a beam reference signal received power of the one or more directional beams associated with the RLF event, a beam measurement of the one or more directional beams associated with the RLF event, or a combination thereof.

47. The method of claim 31 , further comprising: The RLF event is identified as being associated with a conditional handover failure based at least in part on receiving the RLF report, wherein the message includes information regarding the conditional handover failure.

48. The method of claim 47, wherein transmitting the message to the other cell comprises: The message is transmitted to a plurality of candidate target cells associated with a conditional handover, wherein transmitting the message to the another cell is based at least in part on transmitting the message to the plurality of candidate target cells.

49. The method of claim 47, wherein the message comprises: The duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

50. The method of claim 47, further comprising: An indication of one or more candidate target cells for conditional handover is transmitted, wherein receiving the RLF report is based at least in part on transmitting the indication of the one or more candidate target cells for the conditional handover.

51. The method of claim 31 , further comprising: Information regarding a primary cell and a secondary cell in a dual connectivity configuration is identified based at least in part on receiving the RLF report, wherein the message includes the identified information.

52. The method of claim 31 , wherein transmitting the message to the other cell comprises: The message is transmitted to the MCG and the SCG in the dual connectivity configuration.

53. The method of claim 31, wherein the RLF event is for the MCG in the dual connectivity configuration.

54. The method of claim 31 , further comprising: Measurements for the MCG and measurements for the at least one SCG in the dual connectivity configuration are identified based at least in part on receiving the RLF report, wherein the message includes the measurements.

55. The method of claim 31 , further comprising: Identifying a reference signal received power (RSRP) of a last serving cell including the MCG and the at least one SCG in the dual connectivity configuration, or a reference signal received quality (RSRQ) of the last serving cell in the dual connectivity configuration, or a combination thereof based at least in part on receiving the RLF report, wherein the message includes the RSRP or the RSRQ or both for the last serving cell.

56. The method of claim 31 , further comprising: identifying a reference signal received power (RSRP) of a neighboring cell configured by a primary network device or a secondary network device in a dual connectivity configuration, a reference signal received quality (RSRQ) of the neighboring cell, a frequency of the neighboring cell, or an identifier of the neighboring cell, or a combination thereof based at least in part on receiving the RLF report, wherein the message includes the RSRP, the RSRQ, the frequency, the identifier, or the combination thereof of the neighboring cell.

57. The method of claim 31 , further comprising: identifying cell radio network temporary identifiers (C-RNTIs) of a primary network device and at least one secondary network device in a dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the C-RNTIs of the primary network device and the at least one secondary network device.

58. The method of claim 31 , further comprising: identifying an identifier of each cell associated with the RLF event for a primary network device or a secondary network device in a dual connectivity configuration based at least in part on receiving the RLF report, wherein the message includes the identifier of each cell associated with the RLF event.

59. The method of claim 31 , further comprising: Identifiers of primary and secondary cells in the dual connectivity configuration are identified based at least in part on receiving the RLF report when a last RRC reconfiguration message including mobility control information is received, wherein the message includes the identifiers.

60. The method of claim 31 , wherein reestablishing the RRC connection further comprises: receiving an RRC connection reestablishment request from the UE; transmitting an RRC connection reestablishment message based at least in part on receiving the RRC connection reestablishment request; as well as An RRC connection reestablishment complete message is received based at least in part on transmitting the RRC connection reestablishment message.

61. The method of claim 31 , wherein the indication that the one or more RLF reports are available for reporting to the network comprises a flag in an RRC Connection Setup Complete message, and wherein the RRC message comprises the RRC Connection Setup Complete message.

62. The method of claim 61, further comprising: An information request message is transmitted based at least in part on receiving the RRC message including the indication, wherein receiving the RLF report is based at least in part on transmitting the information request message.

63. The method of claim 62, wherein the RLF report is part of an information response message received based at least in part on transmitting the information request message.

64. The method of claim 61, wherein the RRC message comprises an RRC connection reestablishment complete message.

65. The method of claim 31 , further comprising: A handover command is transmitted to the UE, wherein receiving the RLF report is based at least in part on transmitting the handover command.

66. A method for wireless communication, comprising: Identifying a radio link failure (RLF) event between a user equipment (UE) and a network device; re-establishing a radio resource control (RRC) connection with the cell based at least in part on identifying the RLF event; transmitting an RRC message including an indication that one or more RLF reports are available for reporting to a network; as well as Transmitting an RLF report to the cell based at least in part on reestablishing the RRC connection and at least in part on transmitting the RRC message including the indication that the one or more RLF reports are available for reporting to the network, the RLF report including a field containing an indication of a cause of the RLF event and including information about one or more directional beams associated with the RLF event, the indication indicating that the RLF event is a beam recovery failure between the UE and the network device, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes an indication of a first duration of a first service interruption for a primary node associated with the MCG and an indication of a second duration of a second service interruption for a secondary node associated with an SCG in the at least one SCG based at least in part on the RLF event.

67. The method of claim 66, further comprising: The beam restoration failure of at least one directional beam is identified, wherein identifying the RLF event is based at least in part on identifying the beam restoration failure.

68. The method of claim 66, wherein the connection failure type indication in the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, the beam recovery failure, or a combination thereof.

69. The method of claim 66, wherein the RLF report comprises: An identifier of the one or more directional beams associated with the RLF event, a beam reference signal received power of the one or more directional beams associated with the RLF event, a beam measurement of the one or more directional beams associated with the RLF event, or a combination thereof.

70. The method of claim 66, further comprising: Identifying whether a type of handover is an inter-radio access technology (RAT) handover or an intra-RAT handover, wherein the RLF report includes an indication of the type of the handover.

71. The method of claim 66, wherein reestablishing the RRC connection further comprises: Sending RRC connection reestablishment request; receiving an RRC connection reestablishment message based at least in part on transmitting the RRC connection reestablishment request; as well as An RRC connection reestablishment complete message is transmitted based at least in part on receiving the RRC connection reestablishment message.

72. The method of claim 66, wherein the indication that the one or more RLF reports are available for reporting to the network comprises a flag in an RRC Connection Setup Complete message, and wherein the RRC message comprises the RRC Connection Setup Complete message.

73. The method of claim 72, further comprising: An information request message is received based at least in part on transmitting the RRC message including the indication that the one or more RLF reports are available for reporting to a network, wherein transmitting the RLF report is based at least in part on receiving the information request message.

74. The method of claim 73, wherein the RLF report is part of an information response message transmitted based at least in part on receiving the information request message.

75. A method for wireless communication, comprising: re-establishing a radio resource control (RRC) connection with a user equipment (UE) after a radio link failure (RLF) event between the UE and a network device; receiving an RRC message including an indication that one or more RLF reports are available for reporting to a network; receiving an RLF report from the UE, the RLF report including a field containing an indication of a cause of the RLF event and including information about one or more directional beams associated with the RLF event, the indication indicating that the RLF event is a beam recovery failure between the UE and the network device; as well as transmitting, based at least in part on receiving the RRC message including the indication that the one or more RLF reports are available for reporting to the network and based at least in part on receiving the RLF report, a message to another cell of the network, the message including at least a portion of the information regarding the one or more directional beams associated with the RLF event, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes information related to the MCG based at least in part on the RLF event. An indication of a first duration of a first service interruption of a primary node associated with the CG and an indication of a second duration of a second service interruption of a secondary node associated with the SCG in the at least one SCG, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes an indication of a first duration of a first service interruption of the primary node associated with the MCG and an indication of a second duration of a second service interruption of the secondary node associated with the SCG in the at least one SCG based at least in part on the RLF event.

76. The method of claim 75, wherein transmitting the message to the other cell comprises: The message is transmitted to a source cell associated with a handover of the UE.

77. The method of claim 75, wherein transmitting the message to the other cell comprises: The message is transmitted to a core network component, wherein the core network component conveys at least some of the information in the message to a source cell associated with a handover of the UE.

78. The method of claim 77, wherein the core network component comprises at least one component of an Evolved Packet Core (EPC).

79. The method of claim 77, wherein the core network component comprises at least one component of a 5G core network (5GC).

80. The method of claim 75, further comprising: Identify the type of the RLF event; as well as The type of the message to be transmitted is selected based at least in part on identifying the type of the RLF event, wherein transmitting the message is based at least in part on identifying the type of the RLF event.

81. The method of claim 75, wherein the message is a RLF indication.

82. The method of claim 75, wherein the message is a handover report.

83. The method of claim 75, wherein transmitting the message to the other cell comprises: The message is transmitted on the Xn interface.

84. The method of claim 75, wherein transmitting the message to the other cell comprises: The message is transmitted on the X2 interface.

85. A method for wireless communication, comprising: receiving an indication of one or more candidate target cells for conditional handover; determining that a handover condition is satisfied for at least one of the one or more candidate target cells; identifying a radio link failure (RLF) event associated with the conditional handover; re-establishing a radio resource control (RRC) connection with the cell based at least in part on identifying the RLF event; transmitting an RRC message including an indication that one or more RLF reports are available for reporting to a network; as well as Transmitting an RLF report to the cell based at least in part on reestablishing the RRC connection and at least in part on transmitting the RRC message including the indication that the one or more RLF reports are available for reporting to the network, the RLF report including information about one or more directional beams associated with the RLF event and including information about a conditional handover failure, wherein the RLF report includes an indication of a cell identity including a cell global identity and a physical cell identifier, a list of candidate target cells, and an indication of one or more target cells to attempt connection to after the RLF event occurs, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes an indication of a first duration of a first service interruption for a primary node associated with the MCG and an indication of a second duration of a second service interruption for a secondary node associated with an SCG in the at least one SCG based at least in part on the RLF event.

86. The method of claim 85, further comprising: A random access channel (RACH) is initiated toward the at least one candidate target cell that meets the handover condition, wherein identifying that the RLF event is associated with the conditional handover failure is based at least in part on initiating the RACH toward the at least one candidate target cell.

87. The method of claim 86, further comprising: measuring one or more characteristics associated with the one or more candidate target cells; as well as and determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy one or more thresholds, wherein determining that the handover condition is satisfied is based at least in part on determining that the one or more characteristics associated with at least one of the one or more candidate target cells satisfy the one or more thresholds.

88. The method of claim 85, wherein transmitting the RLF report further comprises: The RLF report is transmitted to a plurality of candidate target cells.

89. The method of claim 85, further comprising: identifying whether the RLF event associated with the conditional handover is based at least in part on a too-late handover scenario from a source cell to one of the one or more candidate target cells or a wrong cell handover scenario to a wrong cell, wherein the RLF report includes information indicating whether the RLF event associated with the conditional handover is based at least in part on the too-late handover scenario or the wrong cell handover scenario.

90. The method of claim 85, wherein the RLF report comprises: The duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

91. The method of claim 85, further comprising: A beam restoration failure of at least one directional beam associated with the conditional handover is identified, wherein identifying the RLF event is based at least in part on identifying the beam restoration failure.

92. The method of claim 85, wherein the RLF report is configured to indicate whether the RLF event is a radio link failure, a handover failure, a beam recovery failure, or a combination thereof.

93. The method of claim 85, wherein the RLF report comprises: An identifier of the one or more directional beams associated with the RLF event, a beam reference signal received power of the one or more directional beams associated with the RLF event, a beam measurement of the one or more directional beams associated with the RLF event, or a combination thereof.

94. A method for wireless communication, comprising: re-establishing a radio resource control (RRC) connection with a user equipment (UE) following a radio link failure (RLF) event; receiving an RRC message including an indication that one or more RLF reports are available for reporting to a network; receiving, from the UE, a RLF report based at least in part on receiving the RRC message including the indication that the one or more RLF reports are available for reporting to the network, the RLF report including information regarding one or more directional beams associated with the RLF event; identifying that the RLF event is associated with a conditional handover failure based at least in part on receiving the RLF report; as well as transmitting a message to another cell of a network based at least in part on receiving the RLF report, the message including at least a portion of the information about the one or more directional beams associated with the RLF event and including information about the conditional handover failure, wherein the RLF report includes an indication of a cell identity including a cell global identity and a physical cell identifier, a list of candidate target cells, and an indication of one or more target cells to attempt connection to after the RLF event occurs, wherein the RLF report further includes one or more first measurements for a primary cell group (MCG) and one or more second measurements for at least one secondary cell group (SCG) in a dual connectivity configuration, and wherein the RLF report further includes an indication of a first duration of a first service interruption for a primary node associated with the MCG and an indication of a second duration of a second service interruption for a secondary node associated with an SCG in the at least one SCG based at least in part on the RLF event.

95. The method of claim 94, wherein transmitting the message to the other cell comprises: The message is transmitted to a plurality of candidate target cells associated with a conditional handover, wherein transmitting the message to the another cell is based at least in part on transmitting the message to the plurality of candidate target cells.

96. The method of claim 94, wherein the message comprises: The duration between the last handover initialization and the connection failure, a list of candidate target cells, measurement information for at least one target cell in the list of candidate target cells, an indication of one or more target cells to attempt connection to after the RLF event occurs, a number of connection attempts made after the RLF event occurs, or a combination thereof.

97. The method of claim 94, further comprising: identifying whether the RLF event associated with the conditional handover is based at least in part on a too-late handover scenario from a source cell to one of one or more candidate target cells or a wrong cell handover scenario to a wrong cell, wherein the RLF report includes information indicating whether the RLF event associated with the conditional handover is based at least in part on the too-late handover scenario or the wrong cell handover scenario.

98. The method of claim 94, further comprising: An indication of one or more candidate target cells for conditional handover is transmitted to the UE, wherein receiving the RLF report is based at least in part on transmitting the indication of the one or more candidate target cells for the conditional handover.

99. The method of claim 98, further comprising: identifying a plurality of candidate target cells for the conditional handover with the UE; A conditional handover request is transmitted to the plurality of candidate target cells, wherein transmitting the indication to the UE is based at least in part on transmitting the conditional handover request.

100. The method of claim 94, further comprising: Identify the type of the RLF event; as well as The type of the message to be transmitted is selected based at least in part on identifying the type of the RLF event, wherein transmitting the message is based at least in part on identifying the type of the RLF event.

101. The method of claim 94, wherein the message is a RLF indication.

102. The method of claim 94, wherein the message is a handover report.

103. The method of claim 94, wherein transmitting the message to the other cell comprises: The message is transmitted on the Xn interface.

104. The method of claim 94, wherein transmitting the message to the other cell comprises: The message is transmitted on the X2 interface.

105. The method of claim 94, wherein the message comprises an identifier of the one or more directional beams associated with the RLF event, a beam reference signal received power of the one or more directional beams associated with the RLF event, a beam measurement of the one or more directional beams associated with the RLF event, or a combination thereof.

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