Beam failure recovery method and apparatus for multiple transmission reception points in secondary cell

Abstract

Methods, systems, and devices are described for wireless communication in which one of multiple transmission reception points (TRPs) can be identified for beam failure procedures in a secondary cell (Scell). Reference signals of different TRPs can have different control resource set pool index values, and a user equipment (UE) can monitor such reference signals as part of a beam failure detection (BFD) procedure. The UE can identify one or more beams associated with a particular pool index value that have degraded channel quality and can determine to declare a beam failure. The UE can transmit a link recovery request to a serving cell requesting uplink resources for a beam failure recovery message. The UE can receive an uplink grant and can transmit a beam failure recovery message indicating the Scell and TRP with the beam failure.

Description

[0001] Cross-referencing

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 328,907, filed May 24, 2021, entitled “BEAM FAILURE RECOVERY TECHNIQUES FOR MULTIPLE TRANSMISSION-RECEPTION POINTS IN A SECONDARY CELL,” which claims the benefit of U.S. Provisional Patent Application No. 63 / 029,916, filed May 26, 2020, entitled “BEAM FAILURE RECOVERY TECHNIQUES FOR MULTIPLE TRANSMISSION-RECEPTION POINTS IN A SECONDARY CELL,” which has been assigned to the assignee of this application. Technical Field

[0003] The following text generally relates to wireless communication, and in particular to beam fault recovery techniques for multiple transmit and receive points in a sub-cell.

[0004] background

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, broadcasting, and so on. These systems can 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, LTE-A Advanced (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 can 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 Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, which may also be referred to as User Equipment (UE).

[0006] In some wireless communication systems, a UE and a base station can communicate over a communication link using directional beams. Changes in the radio environment between the UE and the base station can degrade the quality of the beams used by both parties, potentially leading to communication failures. The UE can attempt to perform a beam fault recovery (BFR) procedure to re-establish the connection with the base station. Additionally, in some wireless communication systems, a UE can communicate with more than one transmit-receive point (TRP) (e.g., in a multi-TRP configuration). Each of these multiple TRPs can transmit downlink transmissions to the UE according to the beam configuration, and the UE can decode the downlink transmissions from each of these multiple TRPs according to the beam configuration. Efficient BFR procedures in a multi-TRP configuration can help enhance multi-TRP communication.

[0007] Overview

[0008] The described technology relates to improved methods, systems, apparatus, and devices for beam fault recovery techniques for multiple transmit / receive points in a secondary cell. Various aspects provide user equipment (UE) capable of establishing connections with a primary cell (Pcell) and a secondary cell (Scell), where the Scell ​​connection uses beamforming communication via two or more transmit / receive points (TRPs). In some cases, different TRPs may be associated with different control resource sets (CORESET) pool index values, and one or more component carriers (CCs) may be configured with multiple CORESET pool index values. In some cases, the UE may execute a beam fault detection (BFD) procedure that can identify one or more beams with degraded channel quality associated with a specific CORESET pool index value.

[0009] In some scenarios, different reference signals transmitted via each TRP (e.g., for BFD or for candidate beam detection (CBD)) can provide an indication of the corresponding CORESET pool index detectable at the UE (e.g., based on a sequence of reference signals mapped to the CORESET pool index). In some scenarios, the UE can determine to declare a beam fault for one or more beams and can transmit a Link Recovery Request (LRR) to the base station requesting uplink resources for a Beam Fault Recovery (BFR) message. In some scenarios, the LRR can be transmitted using uplink resources associated with one of the TRPs that can be selected based on BFD. In some scenarios, the UE can receive uplink grant in response to an LRR and can transmit a beam fault recovery message indicating one or more CCs and an associated CORESET pool index, and may also indicate one or more candidate beams for subsequent communication. In some scenarios, subsequent communication using the identified candidate beam(s) can be initiated by resetting one or more beams of the Scell ​​to the identified candidate beam(s).

[0010] A method for wireless communication at a UE is described. The method may include: establishing a connection using a first set of one or more beams and a second set of one or more beams, wherein each of the first set of one or more beams and the second set of one or more beams is associated with a serving cell of the UE; determining to declare a beam fault for the first set of one or more beams based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; selecting one or more of a first uplink control resource or a second uplink control resource associated with a recovery request message in response to determining to declare the beam fault; and transmitting the recovery request message via the selected uplink control resource.

[0011] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: establish a connection using a first set of one or more beams and a second set of one or more beams, wherein each of the first set of one or more beams and the second set of one or more beams is associated with a serving cell of the UE; determine to declare a beam fault for the first set of one or more beams based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; select one or more of a first uplink control resource or a second uplink control resource associated with a recovery request message in response to determining to declare the beam fault; and transmit the recovery request message via the selected uplink control resource.

[0012] Another apparatus for wireless communication at a UE is described. The apparatus may include means for performing the following operations: establishing a connection using a first set of one or more beams and a second set of one or more beams, wherein each of the first set of one or more beams and the second set of one or more beams is associated with a serving cell of the UE; determining to declare a beam fault for the first set of one or more beams based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; selecting one or more of a first uplink control resource or a second uplink control resource associated with a recovery request message in response to determining to declare the beam fault; and transmitting the recovery request message via the selected uplink control resource.

[0013] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: establish a connection using a first set of one or more beams and a second set of one or more beams, each of the first set of one or more beams and the second set of one or more beams being associated with the UE's serving cell; determine to declare a beam fault for the first set of one or more beams based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; select one or more of a first uplink control resource or a second uplink control resource associated with a recovery request message in response to determining to declare the beam fault; and transmit the recovery request message via the selected uplink control resource.

[0014] Examples of methods, apparatuses, and nontransient computer-readable media described herein may further include operations, features, means, or instructions for: measuring one or more reference signals corresponding to a first group of one or more beams and one or more reference signals corresponding to a second group of one or more beams, wherein the first group of one or more reference signals and the second group of one or more beams are associated with a first control resource pool index value, and the second group of one or more reference signals and the second group of one or more beams are associated with a second control resource pool index value, and wherein determining to declare a beam fault is based on a channel metric associated with the first group of one or more reference signals being below a threshold criterion; identifying candidate beams having associated channel metrics that satisfy the threshold criterion or one or more other criteria; and determining the control resource pool index value of the identified candidate beams, wherein the selected uplink control resource is determined based on the identified candidate beams.

[0015] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting an indication of a beam fault declared for a first group or more beams of a serving cell, wherein candidate beams are identified from a set of candidate beams for which a beam fault is declared and associated with a first control resource set pool index value.

[0016] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first control resource set pool index value is associated with a first TRP of the serving cell, and a second control resource set pool index value is associated with a second TRP of the serving cell.

[0017] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: receiving configuration information indicating a first set of reference signals associated with a first control resource pool index value and a second set of reference signals associated with a second control resource pool index value; measuring one or more first sets of reference signals and one or more second sets of reference signals; identifying candidate beams based on the measurements; and determining, based on the configuration information, which of the first or second control resource pool index values ​​is associated with the identified candidate beam.

[0018] Examples of methods, apparatuses, and nontransient computer-readable media described herein may further include operations, features, means, or instructions for: receiving uplink permission for uplink communication in response to a recovery request message; and transmitting uplink communication in response to receiving the uplink permission, the uplink communication indicating at least the index value of the identified candidate beam and the associated control resource set pool of the serving cell. Examples of methods, apparatuses, and nontransient computer-readable media described herein may further include operations, features, means, or instructions for: communicating with one or more of the first TRP or the second TRP of the serving cell using the identified candidate beam after the transmission of uplink communication.

[0019] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first uplink control resource is associated with a first scheduling request identifier, and a second uplink control resource is associated with a second scheduling request identifier. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first uplink control resource is associated with a first control resource set pool index value, and a second uplink control resource is associated with a second control resource set pool index value.

[0020] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the selection may further include operations, features, means, or instructions for selecting a second uplink control resource associated with a second control resource set pool index value of the serving cell for transmission of a recovery request message. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the second uplink control resource is selected based on the component carrier used for transmitting the recovery request message being in the same frequency band as the serving cell.

[0021] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the selection may further include operations, features, means, or instructions for selecting a first uplink control resource associated with a first control resource set pool index value of the serving cell for resuming the transmission of the request message. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first uplink control resource is selected based on a feedback configuration indicating that individual feedback will be provided using a first control resource set pool index value and a second control resource set pool index value of the serving cell.

[0022] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the selection may further include operations, features, means, or instructions for selecting a first uplink control resource or a second uplink control resource based on which of the first uplink control resource or the second uplink control resource is associated with the lowest control resource set pool index value.

[0023] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, when the component carrier used to transmit the recovery request message is in a frequency band different from the frequency band of the serving cell, the minimum control resource set pool index value is used to select either a first uplink control resource or a second uplink control resource.

[0024] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, different instances of the recovery request message are transmitted via each of a first uplink control resource and a second uplink control resource.

[0025] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, each of one or more beams in a first group is associated with a first TRP of the serving cell, and one or more beams in a second group are associated with a second TRP of the serving cell of the UE.

[0026] A method for wireless communication at a UE is described. The method may include: establishing a connection with at least a first transmit / receive point using a first set of one or more beams and establishing a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determining to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identifying a candidate beam associated with either the first or second transmit / receive point having an associated channel metric that satisfies the threshold criterion; and transmitting a beam fault recovery message to either the first or second transmit / receive point, the beam fault recovery message indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0027] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determine to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identify a candidate beam associated with either the first or second transmit / receive point having an associated channel metric that satisfies the threshold criterion; and transmit a beam fault recovery message to either the first or second transmit / receive point, the beam fault recovery message indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0028] Another apparatus for wireless communication at a UE is described. The apparatus may include means for performing the following operations: establishing a connection with at least a first transmit / receive point using a first set of one or more beams and establishing a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determining to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identifying a candidate beam with an associated channel metric satisfying the threshold criterion associated with either the first or second transmit / receive point; and transmitting a beam fault recovery message to either the first or second transmit / receive point, the beam fault recovery message indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0029] A non-transient computer-readable medium is described, storing code for wireless communication at a UE. The code may include instructions executable by a processor to: establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determine to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identify a candidate beam associated with either the first or second transmit / receive point having an associated channel metric that satisfies the threshold criterion; and transmit a beam fault recovery message to either the first or second transmit / receive point, the beam fault recovery message indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0030] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: measuring one or more reference signals corresponding to one or more first-group beams and one or more second-group beams, wherein the first-group beams and one or more first-group beams are associated with a first control resource pool index value, and the second-group beams and one or more second-group beams are associated with a second control resource pool index value, and wherein determining to declare a beam fault is based on a channel metric associated with the first-group beams and one or more reference signals being below a threshold criterion.

[0031] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for transmitting a recovery request message to one or more of a first transmit / receive point (via a first uplink control resource) or a second transmit / receive point (via a second uplink control resource) in response to determining that a beam failure should be declared.

[0032] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for communicating with one or more of a first transmit / receive point or a second transmit / receive point using an identified candidate beam after the transmission of a beam failure recovery message.

[0033] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the communication may include operations, features, means, or instructions for resetting a beam for one or more control resource sets using the same value as the control resource set pool index value of the identified candidate beam.

[0034] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, when a subcell is configured for uplink control information transmission, the transmission beam used to transmit the uplink control information corresponds to an identified candidate beam, or to a different beam having a control resource set pool index value different from the identified candidate beam.

[0035] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the beam fault recovery message is a Media Access Control (MAC) control element and includes a reference signal identifier for a candidate beam, wherein the reference signal identifier indicates a transmit / receive point associated with the candidate beam.

[0036] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of reference signal identifiers is configured at the UE prior to the determination of the reference signal identifier list.

[0037] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which of the first or second transmit / receive point is associated with the identified candidate beam, and a second set of bits indicating the identified candidate beam. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first and second set of bits are provided for each of one or more component carriers for which a beam fault has been declared.

[0038] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which of a first or second transmit / receive point is associated with the identified candidate beam, a second set of bits indicating one or more component carriers for which a beam fault has been declared, and a third set of bits indicating the identified candidate beam.

[0039] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which component carriers in a set of component carriers have declared a beam fault, and a second set of bits indicating an identified candidate beam associated with each indicated component carrier, wherein the transmit / receive point associated with the identified candidate beam is indicated based on the order of the first set of bits.

[0040] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the component carrier set is ordered in a first bit set according to the component carrier index value or control resource set pool index value of the associated component carriers. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first bit set includes several bits based on several component carriers configured for communication with multiple transmit / receive points. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the format of the beam recovery message is selected from two or more available formats based on several component carriers configured for communication with multiple transmit / receive points.

[0041] A method for wireless communication at a base station is described. The method may include: establishing communication with a UE via a serving cell, wherein the communication via the serving cell uses at least one or more first sets of beams and one or more second sets of beams of the serving cell; configuring first uplink control resources and second uplink control resources for transmission of a recovery request message indicating a beam failure of the serving cell at the UE; receiving the recovery request message from the UE in the first uplink control resource; and determining, based on the recovery request message, that the UE has declared the beam failure.

[0042] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: establish communication with a UE via a serving cell, wherein the communication via the serving cell uses at least one or more first sets of beams and one or more second sets of beams of the serving cell; configure a first uplink control resource and a second uplink control resource for transmission of a recovery request message indicating a beam failure of the serving cell at the UE; receive the recovery request message from the UE in the first uplink control resource; and determine, based on the recovery request message, that the UE has declared the beam failure.

[0043] Another apparatus for wireless communication at a base station is described. The apparatus may include means for performing the following operations: establishing communication with a UE via a serving cell, wherein the communication via the serving cell uses at least one or more first sets of beams and one or more second sets of beams of the serving cell; configuring a first uplink control resource and a second uplink control resource for transmission of a recovery request message indicating a beam failure of the serving cell at the UE; receiving the recovery request message from the UE in the first uplink control resource; and determining, based on the recovery request message, that the UE has declared the beam failure.

[0044] A non-transient computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: establish communication with a UE via a serving cell, wherein communication via the serving cell uses at least one or more first sets of beams and one or more second sets of beams of the serving cell; configure a first uplink control resource and a second uplink control resource for transmission of a recovery request message indicating a beam failure at the UE; receive the recovery request message from the UE in the first uplink control resource; and determine, based on the recovery request message, that the UE has declared the beam failure.

[0045] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: configuring two or more control resource set pools having reference signal identifiers associated with a first TRP or a second TRP of the serving cell, wherein beam failure is based on a channel metric associated with the first reference signal being below a threshold criterion, and wherein a first uplink control resource is determined based on a control resource set pool index value of a candidate beam indicated in a recovery request message.

[0046] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for: transmitting uplink permission to the UE for uplink communication in response to a recovery request message; and receiving uplink communication indicating an associated control resource set pool index value of a candidate beam and serving cell in response to the uplink permission.

[0047] Some examples of the methods, apparatuses, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for communicating with the UE using an identified candidate beam after receiving uplink control channel communication. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first uplink control resource is associated with a first scheduling request identifier, and a second uplink control resource is associated with a second scheduling request identifier, wherein a recovery request message indicates either the first scheduling request identifier or the second scheduling request identifier. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first uplink control resource is associated with a first control resource set pool index value of a first beam in a first group of one or more beams, and a second uplink control resource is associated with a second control resource set pool index value of a second beam in a second group of one or more beams.

[0048] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a second uplink control resource associated with a second TRP of the serving cell is used for the transmission of a recovery request message. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the second uplink control resource is selected based on the component carrier used to transmit the recovery request message being in the same frequency band as a first beam in a first group of one or more beams and a second beam in a second group of one or more beams.

[0049] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a first uplink control resource associated with a first TRP of the serving cell is selected for the transmission of the recovery request message. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first uplink control resource is selected based on a feedback configuration that indicates that individual feedback will be provided using a first control resource set pool index value and a second control resource set pool index value of the serving cell.

[0050] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first uplink control resource or the second uplink control resource is selected based on which of the first uplink control resource or the second uplink control resource is associated with the lowest control resource set pool index value.

[0051] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, when the component carrier used to transmit the recovery request message is in a frequency band different from the first beam in a first group of one or more beams and the second beam in a second group of one or more beams, the lowest control resource set pool index value is used to select either the first uplink control resource or the second uplink control resource.

[0052] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, different instances of the recovery request message are received via each of a first uplink control resource and a second uplink control resource.

[0053] A method for wireless communication at a base station is described. The method may include: establishing communication with a UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; configuring a beam failure recovery message for transmission by the UE, the beam failure recovery message indicating a beam failure of the secondary cell at the UE; receiving the beam failure recovery message from the UE, the beam failure recovery message indicating a candidate beam and which of the first or second transmit / receive point is associated with the candidate beam; and communicating with the UE via the candidate beam in response to the beam failure recovery message.

[0054] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. These instructions are executable by the processor to cause the apparatus to: establish communication with a UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; configure a beam failure recovery message for transmission by the UE, the beam failure recovery message indicating a beam failure of the secondary cell at the UE; receive the beam failure recovery message from the UE, the beam failure recovery message indicating a candidate beam and which of the first or second transmit / receive point is associated with the candidate beam; and communicate with the UE via the candidate beam in response to the beam failure recovery message.

[0055] Another apparatus for wireless communication at a base station is described. The apparatus may include means for performing the following operations: establishing communication with a UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; configuring a beam failure recovery message for transmission by the UE, the beam failure recovery message indicating a beam failure of the secondary cell at the UE; receiving the beam failure recovery message from the UE, the beam failure recovery message indicating a candidate beam and which of the first or second transmit / receive point is associated with the candidate beam; and communicating with the UE via the candidate beam in response to the beam failure recovery message.

[0056] A non-transient computer-readable medium is described, storing code for wireless communication at a base station. The code may include instructions executable by a processor to: establish communication with a UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; configure a beam failure recovery message for transmission by the UE, the beam failure recovery message indicating a beam failure at the UE in the secondary cell; receive the beam failure recovery message from the UE, the beam failure recovery message indicating a candidate beam and which of the first or second transmit / receive point is associated with the candidate beam; and communicate with the UE via the candidate beam in response to the beam failure recovery message.

[0057] Some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein may further include operations, features, means or instructions for configuring a first fault detection resource set corresponding to a first control resource set pool index for a first transmit / receive point and a second fault detection resource set corresponding to a second control resource set pool index for a second transmit / receive point, wherein a beam fault recovery message is conveyed using a fault detection resource set corresponding to either the first or the second transmit / receive point.

[0058] Some examples of the methods, apparatuses, and non-transient computer-readable media described herein may further include operations, features, means, or instructions for: receiving a recovery request message prior to receiving a beam failure recovery message; and transmitting uplink permission to the UE for the beam failure recovery message. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, communication with the UE via a candidate beam is initiated at a predetermined time after the beam failure recovery message.

[0059] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the beam fault recovery message is a Media Access Control (MAC) control element and includes a reference signal identifier for a candidate beam, wherein the reference signal identifier indicates a transmit / receive point associated with the candidate beam.

[0060] In some examples of the methods, apparatus (devices) and non-transient computer-readable media described herein, the set of reference signal identifiers is configured at the UE in a list of reference signal identifiers.

[0061] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which of the first or second transmit / receive point is associated with the identified candidate beam, and a second set of bits indicating the identified candidate beam. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first and second set of bits are provided for each of one or more component carriers for which a beam fault has been declared.

[0062] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which of a first or second transmit / receive point is associated with the identified candidate beam, a second set of bits indicating one or more component carriers for which a beam fault has been declared, and a third set of bits indicating the identified candidate beam.

[0063] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, a beam fault recovery message includes a first set of bits indicating which component carriers in a set of component carriers have declared a beam fault, and a second set of bits indicating an identified candidate beam associated with each indicated component carrier, wherein the transmit / receive point associated with the identified candidate beam is indicated based on the order of the first set of bits.

[0064] In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the component carrier set is ordered in a first bit set according to the component carrier index value or control resource set pool index value of the associated component carriers. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the first bit set includes several bits based on several component carriers configured for communication with multiple transmit / receive points. In some examples of the methods, apparatuses, and non-transient computer-readable media described herein, the format of the beam recovery message is selected from two or more available formats based on several component carriers configured for communication with multiple transmit / receive points. Brief description of the attached diagram

[0066] Figure 1 Examples of wireless communication systems that support beam fault recovery techniques for multiple transmit and receive points in a sub-cell, according to various aspects of this disclosure, are explained.

[0067] Figure 2 An example of a wireless communication system that supports beam fault recovery techniques for multiple transmit and receive points in a sub-cell, according to various aspects of this disclosure, is explained.

[0068] Figure 3 An example of a process flow for beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, supported by various aspects of this disclosure, is explained.

[0069] Figure 4 Another example of a process flow for beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, supported by various aspects of this disclosure, is explained.

[0070] Figure 5 Examples of beam fault recovery messages supporting beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, are explained.

[0071] Figure 6 and 7 A block diagram of an apparatus for beam fault recovery technology for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, is shown.

[0072] Figure 8 A block diagram of a communication manager supporting beam fault recovery technology for multiple transmit and receive points in a sub-cell is shown, according to various aspects of this disclosure.

[0073] Figure 9 A diagram of a system including devices supporting beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, is shown.

[0074] Figure 10 and 11 A block diagram of an apparatus for beam fault recovery technology for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, is shown.

[0075] Figure 12 A block diagram of a communication manager supporting beam fault recovery technology for multiple transmit and receive points in a sub-cell is shown, according to various aspects of this disclosure.

[0076] Figure 13 A diagram of a system including devices supporting beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, is shown.

[0077] Figures 14 to 22 A flowchart illustrating a method for beam fault recovery techniques for multiple transmit and receive points in a subcellular cell, according to various aspects of this disclosure, is shown.

[0078] Detailed description

[0079] In some wireless communication systems, a user equipment (UE) may support communication with multiple transmit-receive points (TRPs). For example, the UE may receive downlink transmissions from multiple TRPs (e.g., via the Physical Downlink Shared Channel (PDSCH)). Furthermore, the UE may decode the downlink transmission according to the beam configuration associated with each of the downlink transmissions. Moreover, such multi-TRP communication can be primary cell (Pcell) communication, secondary cell (Scell) communication, or both. In some cases, one or more beams from a particular TRP may degrade to the point where effective communication via that beam is impossible. Therefore, in such cases, beam failure detection (BFD) and beam failure recovery (BFR) may be helpful in facilitating communication. In situations where multiple TRPs are used for communication, techniques such as those discussed herein can be used to identify beam failures, select candidate beams for use in subsequent communications, and communicate information related to such beams to the Scell.

[0080] In some scenarios, the UE can establish connections with both the Pcell and the Scell, where the Scell, and in some cases the Pcell, uses beamforming communication via two or more Transmit / Receive Points (TRPs). In some cases, different TRPs can be associated with different Control Resource Set (CORESET) pool index values, and one or more Scell ​​component carriers (CCs) can be configured with multiple CORESET pool index values. Therefore, from the UE's perspective, the different TRPs are transparent, and the UE can identify only the different CORESET pool index values ​​associated with the received signal.

[0081] In some scenarios, the UE may execute a BFD procedure that identifies one or more beams with degraded channel quality associated with a specific CORESET pool index value. In some scenarios, reference signals transmitted via each TRP (e.g., for BFD or for candidate beam detection (CBD)) may provide an indication of the corresponding CORESET pool index detectable at the UE (e.g., based on a reference signal sequence). In some scenarios, the UE may determine to declare a beam fault for one or more beams and may transmit a Link Recovery Request (LRR) to the base station requesting uplink resources for a Beam Fault Recovery (BFR) message. In some scenarios, the LRR may be transmitted using uplink resources associated with one of the TRPs that can be selected based on BFD. In some scenarios, the UE may receive uplink permission in response to an LRR and may transmit a beam fault recovery message indicating one or more CCs and an associated CORESET pool index, and may also indicate one or more candidate beams for subsequent communication. In some cases, subsequent communication using the identified candidate beam(s) can be initiated by resetting one or more beams of the Scell ​​to the identified candidate beam(s).

[0082] The aspects of this disclosure are initially described in the context of wireless communication systems. These aspects are further explained and described by way of process flow, apparatus diagrams, system diagrams, and flowcharts relating to beam fault recovery techniques for multiple transmit and receive points in a subcellular cell.

[0083] Figure 1Examples of a wireless communication system 100 supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, are described. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0084] Base station 105 can be distributed across a geographical area to form wireless communication system 100, and can be different types of devices or devices with different capabilities. Base station 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area over which base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0085] Each UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary or mobile, or stationary and mobile at different times. Each UE 115 can be a different type of device or a device with different capabilities. Figure 1 The document describes some example UE 115s. The UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment). Figure 1 As shown in the image.

[0086] Each base station 105 may communicate with the core network 130, or with each other, or both. For example, base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base stations 105 may communicate with each other directly (e.g., directly between base stations 105), indirectly (e.g., via the core network 130), or directly and indirectly on backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links.

[0087] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, B node, evolved B node (eNB), next-generation B node or gigabit B node (any of which may be referred to as gNB), home B node, home evolved B node, or other suitable terms.

[0088] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0089] The UE 115 described herein can communicate with various types of devices, such as other UEs 115 that sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 As shown in the image.

[0090] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. Wireless communication system 100 may support communication with UE 115 using carrier aggregation or multi-carrier operation. UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0091] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate the operation of other carriers. The carrier may be associated with a 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 UE 115. The carrier may operate in an autonomous mode in which initial acquisition and connection can be performed by UE 115 via that carrier, or in a non-autonomous mode in which the carrier may connect to carriers anchored using different carriers (e.g., different carriers of the same or different radio access technologies).

[0092] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0093] A carrier may be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several defined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz) of a carrier for a particular radio access technology. Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) may have a hardware configuration that supports communication over a specific carrier bandwidth, or may be configurable to support communication over a single carrier bandwidth within a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate over a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0094] The signal waveform transmitted on the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, 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, the code rate of the modulation scheme, or both). Thus, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 can achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and using multiple spatial layers can further improve the data rate or data integrity of communication with the UE 115.

[0095] One or more sets of parameters can be supported for a carrier, where the parameter set may include the subcarrier spacing (Δf) and the cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter designs. In some examples, the UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for the UE 115 can be limited to one or more active BWPs.

[0096] The time interval of base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as the sampling period T. s =1 / (Δf) max ·N f ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, while N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resources can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0097] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may (e.g., in the time domain) be divided into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f Sampling period. The duration of the symbol period can depend on the subcarrier spacing or the operating frequency band.

[0098] A subframe, time slot, mini-slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0099] Physical channels can be multiplexed on a carrier using various techniques. Physical control channels and physical data channels can be multiplexed on a downlink carrier, for example, using one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. The search space set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set configured to send control information to a specific UE 115.

[0100] Each base station 105 may provide communication coverage via one or more cells (e.g., macrocells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., on a carrier) and may be associated with an identifier used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such cells may vary from smaller areas (e.g., structures, subsets of structures) to larger areas depending on various factors (such as the capabilities of base station 105). For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, among other examples.

[0101] Macrocells typically cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access for UEs 115 that have service subscriptions with a network provider supporting the macrocell. Small cells may be associated with a lower-power base station 105 (compared to macrocells) and may operate in the same or different (e.g., licensed or unlicensed) frequency bands as macrocells. Small cells may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a Closed Subscriber Group (CSG), or UEs 115 associated with a user in a home or office). Base station 105 may support one or more cells and may also support communication on one or more cells using one or more component carriers.

[0102] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0103] In some examples, base station 105 may be mobile, and thus provide communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage to various geographic coverage areas 110.

[0104] Some UE 115 devices (such as MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to people interacting with the application. Some UE 115 devices may be designed to collect information or automate the behavior of machines or other devices. 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 toll collection.

[0105] Wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication, or various combinations thereof. For example, wireless communication system 100 may be configured to support ultra-reliable low latency communication (URLLC) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private or group communication and may be supported by one or more mission-critical services, such as Mission-Critical Talk-to-Talk (MCPTT), Mission-Critical Video (MCVideo), or Mission-Critical Data (MCData)). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general business applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency are used interchangeably herein.

[0106] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or may be unable to receive transmissions from base station 105 for other reasons. In some examples, groups of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between the individual UE 115s without involving base station 105.

[0107] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-vehicle (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information relevant to the V2X system. In some examples, vehicles in a V2X system may communicate via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105) with roadside infrastructure (such as roadside units), or with the network, or with both.

[0108] Core network 130 provides user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC). The EPC or 5GC may include at least one control plane entity (e.g., a Mobility Management Entity (MME), Access and Mobility Management Function (AMF)) for managing access and mobility, and at least one user plane entity (e.g., a Serving Gateway (S-GW), Packet Data Network (PDN) Gateway (P-GW), or User Plane Function (UPF)) for routing packets or interconnecting to external networks. The control plane entity manages non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which provides IP address allocation and other functions. The user plane entity can connect to network operator IP service 150. Carrier IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0109] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be interchangeably referred to as a radio headend (e.g., a remote radio headend (RRH)), a smart radio headend, or a transmit / receive point (TRP). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0110] Wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz. Generally, the 300 MHz to 3 GHz band is referred to as a UHF band or decimeter band because the wavelengths range from approximately 1 decimeter to 1 meter. UHF waves can be blocked or redirected by buildings and environmental features, but these waves can penetrate various structures sufficiently for macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the lower HF or VHF portions of the spectrum below 300 MHz, UHF wave transmission can be associated with smaller antennas and shorter ranges (e.g., less than 100 km).

[0111] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) zoning using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band) or in the extremely high frequency (EHF) zoning using a spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency zonings, and the frequency band usage specified across these frequency zonings may vary by country or regulatory authority.

[0112] Wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in licensed frequency bands. Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0113] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may coexist at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0114] Base station 105 or UE 115 can use MIMO communication to leverage multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. This technique is known as spatial multiplexing. For example, a transmitting device may transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals via different antennas or different combinations of antennas. Each of the 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 (e.g., different codewords). Different spatial layers may be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0115] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating relative to a particular orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements may include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with that device. The adjustments associated with each antenna element may be defined by a beamforming weight set associated with a particular orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0116] Base station 105 or UE 115 may use beamsweeping techniques as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) for beamforming operations to facilitate directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals based on different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by the transmitting device (such as base station 105) or the receiving device (such as UE 115)) to identify the beam direction that base station 105 uses for later transmission or reception.

[0117] Some signals (such as data signals associated with a specific receiving device) may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device (such as UE 115)). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on the signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signals received by UE 115 with the highest signal quality or other acceptable signal quality.

[0118] In some examples, transmissions performed by a device (e.g., by base station 105 or UE 115) may be executed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate combined beams for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals that may be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). 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 to transmit signals multiple times in different directions (e.g., to identify the beam direction used by UE 115 for subsequent transmission or reception) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0119] A receiver device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiver device may attempt multiple receive directions by: receiving via different antenna subarrays; processing received signals according to different antenna subarrays; receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" according to different receive configurations or receive directions. In some examples, the receiver device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0120] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer performs packet segmentation and reassembly for communication on logical channels. The Media Access Control (MAC) layer performs priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that support user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0121] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correctly receiving data on communication link 125. HARQ may include a combination of error detection (e.g., using 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., low signal-to-noise ratio conditions). In some examples, the device may support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in previous symbols within that time slot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

[0122] As discussed herein, in some scenarios, multiple TRPs (e.g., multiple RRHs of base station 105) may be used to communicate with UE 115 on Pcell, Scell, or both. In some scenarios, reference signals for different TRPs may have different CORESET pool indices, and one or more UEs 115 may monitor such reference signals as part of a BFD procedure. In such scenarios, one or more UEs 115 may identify one or more beams with degraded channel quality associated with a specific CORESET pool index value. In some scenarios, such UEs 115 may determine to declare a beam fault for one or more beams at Scell ​​and may (e.g., via Pcell) transmit an LRR requesting uplink resources for a BFR message to the serving base station 105. In some scenarios, the LRR may be transmitted using uplink resources associated with one of the TRPs that can be selected based on BFD. In some scenarios, UE 115 may receive uplink grant in response to LRR and may transmit a beam fault recovery message (e.g., BFR MAC-CE) indicating one or more CCs and an associated CORESET pool index, and may also indicate one or more candidate beams for subsequent communication. In some scenarios, subsequent communication using the identified candidate beam(s) can be initiated by resetting one or more beams of the Scell ​​to the identified candidate beam(s).

[0123] Figure 2 Examples of a wireless communication system 200 supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, are described. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100. The wireless communication system 200 may include a UE 205 and several TRPs 215, which may be examples of the corresponding devices described herein. In this example, the TRPs 215 may provide multiple TRP Scells, wherein a first beam 220-a of a first TRP 215-a and a second beam 220-b of a second TRP 215-b provide communication with the UE 205.

[0124] In some scenarios, multi-TRP transmissions can be configured based on multiple downlink control information (DCI) communications, wherein a first DCI (e.g., transmitted from a first TRP 215-a in PDCCH1) schedules downlink shared channel transmissions (e.g., PDSCH1 transmitted from a first TRP 215-a via a first beam 220-a), and a second DCI (e.g., transmitted from a second TRP 215-b in PDCCH2) schedules second downlink shared channel transmissions (e.g., PDSCH2 transmitted from a second TRP 215-b via a second beam 220-b). In some scenarios, the TRP 215 distinction at UE 205 can be based on the value of a CORESET pool index (e.g., CORESETPoolIndex), wherein each CORESET (e.g., up to five CORESETs) can be configured with a CORESET pool index value. In some cases, the value of the CORESET pool index can be 0 or 1, which groups the CORESET into two groups, which can correspond to different TRP 215s. Only some CCs can be configured to have two CORESET pool index values, while other CCs may not be configured to have two CORESET pool index values, and therefore BFD / BFR on a per TRP 215 basis can be provided to CCs configured to have two CORESET pool index values.

[0125] In some scenarios, UE 205 can be configured to provide per-TRP 215BFR, which implements separate BFD and separate CBD for the beam corresponding to TRP 215 in a CC with two CORESET pool index values. In the absence of per-TRP 215BFR, beam failure detection and beam candidate determination are not triggered until all beams in that CC become weak. With per-TRP 215BFR, when a beam for a given TRP becomes weak, a recovery procedure can be performed, and the optimal beam corresponding to that TRP 215 can be identified without waiting for beams in other TRPs 215 to also become weak, thus improving reliability and communication efficiency. Figure 2 In the example, Scell ​​210 can be configured with two CORESET pool index values, one associated with a first TRP 215-a and the other with a second TRP 215-b. In this scenario, each TRP 215 can transmit one or more BFD reference signals that can be monitored by UE 205. In this example, UE 205 can determine that the first beam 220-a of the first CORESET pool index value has a channel metric below a threshold (e.g., the reference signal received power RSRP) (e.g., when the radio link quality is worse than a threshold Qout for all reference signals in the BFD resource associated with the CORESET pool index value). Figures 3 to 5 Various examples of beam fault declaration, candidate beam detection, and beam recovery are discussed.

[0126] Figure 3 Examples of a process flow 300 supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, are described. In some examples, process flow 300 may implement aspects of wireless communication systems 100 or 200. Process flow 300 may be implemented by a UE 310 and a PCcell 305 with two values ​​(and served by multiple different TRPs) having a CORESET pool index value. In the following description of process flow 300, communication between UE 310 and PCcell 305 may be transmitted in a different order than the example order shown, or operations performed by UE 310 and PCcell 305 may be performed in a different order or at different times. Some operations may also be omitted from process flow 300, and others may be added to process flow 300.

[0127] In some examples, the operations described in process flow 300 may be performed by hardware (e.g., including circuit systems, processing blocks, logic components, and other components), code executed by a processor (e.g., software or firmware), or any combination thereof. Alternative examples are possible, in which some steps are performed in a different order than described or not at all. In some cases, the steps may include additional features not mentioned below, or further steps may be added.

[0128] At 315, Pcell 305 can transmit and UE 310 can receive one or more BFD reference signals from the BFD reference signal set. UE 310 can measure one or more channel metrics of the BFD reference signals as part of the BFD procedure. Depending on various aspects, the BFD reference signals can be transmitted by different TRPs and have multiple CORESET pool index values, and the BFD reference signals have an indication of the associated CORESET pool index value (e.g., 0 or 1 (based on the reference signal sequence configured as CORESET pool index value)).

[0129] At 320, UE 310 can determine that BFD has been detected. In some cases, BFD detection can be based on a channel metric of the reference signal being below a threshold (e.g., Qout). In some cases, BFD can be based on periodic CSI-RS resources configured by RRC (e.g., configured by the RRC parameter failureDetectionResources). In some cases, the BFD reference signal can include up to two reference signals on a single port. If no BFD reference signal is configured, the set of reference signals indicated by the active TCI state of the CORESET monitored by UE 310 can be used. If there are two reference signal indices for the active TCI state of the CORESET, the reference signal index with QCL type D is used. The physical layer in UE 310 can evaluate radio link quality based on the BFD set for a threshold (e.g., Qout). If the radio link quality is worse than Qout for all reference signals in the BFD resource set, UE 310 can declare a beam fault.

[0130] In 325, UE 310 can perform candidate beam detection (CBD). In some cases, CBD can be based on periodic CSI-RS / SSBs configured by RRC (e.g., configured by the RRC parameter candidateBeamRSList). In some cases, up to 16 resources with corresponding random access preamble indices (e.g., ra-preamble-index) can be configured. UE 310 can provide reference signal indices and RSRPs in the list with RSRP values ​​equal to or greater than a threshold (e.g., Qin), which can be a configurable threshold.

[0131] At 330, UE 310 may transmit a Random Access Channel (RACH) request to Pcell 305. In some cases, UE 310 may initiate a random access procedure (e.g., contention-free random access) based on a random access resource (e.g., ra-preamble-index) associated with a selected reference signal index (e.g., RS index q_new) that is above a threshold.

[0132] At 335, Pcell 305 can transmit a BFR response, and UE 310 can receive the BFR response. In some cases, UE 310 can monitor the PDCCH in the search space set provided by RRC parameters (e.g., recoverySearchSpaceId) for detecting a DCI format with a CRC scrambled by C-RNTI or MCS-C-RNTI starting from time slot n+4. If UE 310 receives the PDCCH within this window, BFR is complete. After the BFR response, UE 310 can use QCL assumptions about the same QCL parameters associated with the reference signal index q_new until UE 310 receives activation for the TCI state. In some cases, after the UE 310 detects 28 symbols from the last symbol of the first PDCCH received with a DCI format scrambled by C-RNTI or MCS-C-RNTI, the UE 310 assumes the same QCL parameter as the QCL parameter associated with the RS index q_new for PDCCH monitoring in the CORESET with index 0.

[0133] In some scenarios, a Pcell can be configured with multiple TRPs, and the CORESET pool index can be configured with two values. In some cases, separate RACH resources can be configured for different CORESET pool index values, which allows the UE 310 to indicate a beam fault associated with a specific CORESET pool index value, which can be associated with a specific TRP. As discussed herein, in some scenarios, one or more Scells can be configured with two CORESET pool index values, and the UE can execute a BFD procedure for the Scell, see reference... Figure 4 Examples of it were discussed.

[0134] Figure 4Examples of a process flow 400 supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, are described. In some examples, process flow 400 may implement aspects of wireless communication systems 100 or 200. Process flow 400 may be implemented by UE 410, PCell 405, and Scell ​​415, wherein Scell ​​415 may have two CORESET pool index values ​​(and be served by multiple different TRPs), as described herein. In the following description of process flow 400, communication between UE 410, PCell 405, and Scell ​​415 may be transmitted in a different order than the example order shown, or operations performed by UE 410, PCell 405, and Scell ​​415 may be performed in a different order or at different times. Some operations may also be omitted from process flow 400, and others may be added to process flow 400.

[0135] In some examples, the operations described in process flow 400 may be performed by hardware (e.g., including circuit systems, processing blocks, logic components, and other components), code executed by a processor (e.g., software or firmware), or any combination thereof. Alternative examples are possible, in which some steps are performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or further steps may be added.

[0136] At 420, Scell ​​415 can transmit and UE 410 can receive one or more BFD reference signals from the BFD reference signal set. UE 410 can measure one or more channel metrics of the BFD reference signals as part of the BFD procedure. Depending on various aspects, the BFD reference signals can be transmitted by different TRPs and have multiple CORESET pool index values, and the BFD reference signals have an indication of the associated CORESET pool index value (e.g., 0 or 1 (based on the reference signal sequence configured as CORESET pool index value)).

[0137] At 420, UE 410 can determine that BFD has been detected. In some cases, compared with the reference... Figure 3Similarly, in the scenarios discussed, BFD detection can be based on a channel metric of the reference signal being below a threshold (e.g., Qout). In some cases, BFD can be based on periodic CSI-RS resources configured by RRC (e.g., configured by the RRC parameter failureDetectionResources). In some cases, the BFD reference signal can include up to two reference signals on a single port. If no BFD reference signal is configured, the set of reference signals indicated by the active TCI state of the CORESET monitored by UE 410 can be used. If two reference signal indices exist for the active TCI state of the CORESET, the reference signal index with QCL type D is used. The physical layer in UE 410 can evaluate radio link quality based on the BFD set for a threshold (e.g., Qout). If the radio link quality is worse than Qout for all reference signals in the BFD resource set, UE 410 can declare a beam fault.

[0138] In one example, two fault detection resource sets can be configured, each corresponding to a different CORESET pool index value. In another example, each resource within a fault detection resource used to transmit BFD reference signals can be configured with a CORESET pool index value. In some cases, if a resource is not configured with a CORESET pool index value, it is assumed that the resource is associated with a CORESET pool index value of 0. In some cases, BFD reference signal resources can be configured with two values ​​for the CORESET pool index, in which case the associated reference signals are considered for both TRPs. In some cases, when fault detection resources are not configured, the first and second resource sets are determined by the set of reference signals indicated by the active TCI state of the CORESET configured with CORESET pool index 0 or 1, respectively. In some cases, a beam fault is declared for a CORESET pool index value when the radio link quality for all reference signals in the BFD resource associated with the CORESET pool index value is worse than a configured threshold (e.g., Qout).

[0139] At 430, UE 410 can transmit a Link Recovery Request (LRR) on Pcell 405. In some cases, the LRR can be transmitted on a Pcell, on the primary Scell ​​(Pscell), or on an Scell ​​configured for a PUCCH BFR configured therein (PUCCH-Scell). The LRR can indicate that UE 410 is requesting uplink resources (e.g., similar to a Scheduling Request (SR)) and can use PUCCH format 0 or 1. In some cases, two PUCCH resources can be configured for the LRR using two corresponding Scheduling Request IDs (e.g., indicated by schedulingRequestID-BFR-Scell). These two PUCCH resources or Scheduling Request IDs can be associated with two CORESET pool index values. If a BFD is declared for a value of the CORESET pool index in Scell ​​415, in some cases, the PUCCH resource / Scheduling Request ID corresponding to another value of the CORESET pool index can be used for the LRR transmission. This type of resource selection rule stipulates that if the Scell ​​415 and PUCCH cells have the same beam, and if all beams for one TRP become weak, then the beam corresponding to the other TRP is used to transmit LRR. For example, this rule can be applied when a CC with PUCCH-BFR is in the same frequency band as Scell ​​415.

[0140] In other cases, the PUCCH resource / scheduling request ID corresponding to the same CORESET pool index value is used for LRR transmission. This choice allows LRR to be transmitted to the same TRP even in non-ideal backhaul scenarios. For example, this rule can be followed when separate feedback is configured for different cells (ACKNACKFeedbackMode = SeparateFeedback). In other cases, the PUCCH resource / scheduling request ID corresponding to CORESET pool index = 0 is used for LRR transmission. For example, this rule can be followed when a CC with PUCCH-BFR is in a different frequency band than Scell ​​415. In yet another case, both the PUCCH resource / scheduling request ID can be used to transmit LRR, regardless of the CORESET pool index for which its BFD is declared. This means that multiple instances of LRR transmission are provided across two PUCCH resources (and transmitted to two TRPs).

[0141] At 435, Pcell 405 can provide uplink grant to UE 410. This uplink grant can be a normal uplink grant with C-RNTI / MCS-C-RNTI that can be used as a response to LRR, which UE 410 can use to schedule PUSCH in which BFR MAC-CE can be transmitted. Note that in some cases, UE 410 may have existing uplink grants, in which case LRR and associated uplink grant operations can be skipped.

[0142] At 440, UE 410 can execute the CBD procedure. Before sending the MAC-CE with a beam fault recovery message, UE 410 can first identify one or more candidate beams for the faulty Scell. The CBD procedure can be performed as per reference. Figure 3 The discussed approach is executed in a similar manner, the difference being that this procedure is for Scell ​​415. In some cases (e.g., indicated in the RRC in candidateBeamRSSCellList-r16), up to 64 resources can be transmitted on a faulty Scell ​​415 or on another CC in the same frequency band. In some cases, each candidate beam is associated with a CORESET pool index value. In one example, two candidate beam lists, each corresponding to a CORESET pool index value, can be provided (e.g., two lists are configured for the parameter candidateBeamRSSCellList-r16). In another example, each reference signal in the candidate beam list (e.g., in candidateBeamRSSCellList-r16) can be configured with a CORESET pool index value. In some cases, if a reference signal is not configured with a CORESET pool index value, it is assumed that the reference signal is associated with CORESET pool index value 0. Furthermore, it is permissible to configure a reference signal with two CORESET pool index values, in which case the reference signal is considered for both TRPs. When declaring a BFD for a CORESET pool index value, candidate beams can be identified only within reference signals associated with the same CORESET pool index value.

[0143] In 445, UE 410 can transmit beam fault recovery messages in BFR MAC-CE. See references in this document. Figure 5An example of BFR MAC-CE is discussed. BFR MAC-CE is transmitted using resources provided in the uplink grant and can be transmitted on any cell (including a failed Scell ​​415). In some cases, UE 410 can indicate the CORESET pool index value in the corresponding Scell ​​415's Scell ​​MAC-CE. In some cases, it can be based on a reference... Figure 5 Examples are discussed to provide such instructions.

[0144] At 450, Pcell 405 can provide a BFR response to UE 410. In some cases, this response can be an uplink grant to schedule a new transmission (e.g., a new data indicator (NDI) with handover) for the same HARQ procedure as the PUSCH carrying the BFR MAC-CE. In some cases, if a new beam corresponding to the CORESET pool index value is reported in Scell ​​415 in the BFR MAC-CE, UE 410 can use the QCL assumption that only CORESETs with the same CORESET pool index value are reset to a new beam (e.g., qnew) in Scell ​​415 28 symbols after the end of the BFR response (end of PDCCH). Assuming that PUCCH resources are also associated with CORESET pool index values, when Scell ​​415 is a PUCCH-Scell, only the spatial relationships of those PUCCH resources associated with the same CORESET pool index value are reset to a new beam in Scell ​​415. If the PUCCH resource is not associated with a CORESET pool index value, and if BFRMAC-CE indicates BFD and candidate beams for two CORESET pool index values ​​(e.g., two qnew in Scell ​​415), then the PUCCH beam is reset to the candidate beam corresponding to CORESET pool index = 0 (when Scell ​​is PUCCH-Scell).

[0145] Therefore, in some cases, when a secondary cell is configured for uplink control information transmission, UE410 can reset the beam for one or more PUCCH resources associated with the same value as the CORESET pool index value of the identified candidate beam. Furthermore, in some cases, when a secondary cell is configured for uplink control information transmission, UE410 can reset the beam for one or more PUCCH resources in response to the CORESET pool index value of the identified candidate beam having a first value (e.g., CORESET pool index = 0), and suppress the reset of the beam for the one or more PUCCH resources in response to the CORESET pool index value of the identified candidate beam having a second value (e.g., CORESET pool index = 1).

[0146] Figure 5 Examples of beam fault recovery messages 500 (e.g., BFR MAC-CE) supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, are explained. In some examples, the beam fault recovery message 500 may implement aspects of wireless communication systems 100 or 200. In this example, a MAC-CE in which the first octet 505 includes an indication of an Scell ​​is explained. In this example, the explained MAC-CE may include information about up to seven Scells using a first subset 510 of the first octet 505. In other examples, there may be more than seven Scells, or there may be more than seven Scells and combinations of different associated CORESET pool index values, and additional octets including indications of Scells or Scells and CORESET pool index values ​​may be configured.

[0147] In this example, the first octet 505 includes a second subset 525 of reserved bits, which, in some cases, can be used to indicate whether the entire MAC-CE applies to a specific CORESET pool index value. Several additional octets can be provided in the MAC-CE, each indicating a candidate reference signal ID or R bit 515, and may also include a reserved field 520, which, in some cases, can be used to indicate the associated CORESET pool index value. In some cases, the number of additional octets may depend on how many Scells and candidate beams are reported in the MAC-CE.

[0148] In some examples, the candidate reference signal ID 515 can implicitly indicate a CORESET pool index value (e.g., if the reference signal ID is mapped or otherwise associated with that CORESET pool index value). This option can be used when the candidate beam list (e.g., candidatebeamRSSCellList) contains all reference signals and a separate list is not configured. In some cases, the candidate reference signal ID 515 can be a third bit subset of the MAC-CE.

[0149] In other cases, if the value Ci = 1 for Scell ​​(indicating the candidate beam in the MAC-CE for Scell), then the reserved field 520 in the corresponding octet can be used to indicate the value of the CORESET pool index.

[0150] In other examples, the entire MAC-CE may correspond to a CORESET pool index value. In such cases, the second bit subset 525 in the first octet indicates that CORESET pool index value. In such cases, if Ci = 1 for an Scell ​​that is not configured with two CORESET pool index values, the CORESET pool index indicated in the MAC-CE is not applicable.

[0151] In a further example, for an Scell, a separate Ci field can indicate the BFD / candidate beam corresponding to the first or second CORESET pool index value. In such cases, Ci can be sorted with respect to the serving cell index of the Scell ​​and with respect to the CORESET pool index value for those Scells configured with two CORESET pool index values. In some cases, the Ci field can be sorted first with respect to the serving cell index and then with respect to the CORESET pool index value. In other cases, the Ci field can be sorted first with respect to the CORESET pool index value and then with respect to the serving cell index. In this example, the number of Ci fields depends on how many Scells are configured with two CORESET pool index values. In some cases, different MAC-CE formats can be used depending on the number of Scells to be reported, and when the number of Ci fields is 7 or less based on the above, formats such as... Figure 5 The first format is explained in the document, and a second format, which can be used in other ways, includes an additional octet that can provide an additional Ci field.

[0152] Figure 6A block diagram 600 of an apparatus 605 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to aspects of this disclosure, is shown. Apparatus 605 may be an example of aspects of UE 115 as described herein. Apparatus 605 may include a receiver 610, a communication manager 615, and a transmitter 620. Apparatus 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0153] Receiver 610 can 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 beam fault recovery techniques for multiple transmit and receive points in a sub-cell). This information can be transmitted to other components of device 605. Receiver 610 can be a reference... Figure 9 Examples of various aspects of the transceiver 920 described. The receiver 610 may utilize a single antenna or an array of antennas.

[0154] The communication manager 615 may establish a connection using a first group of one or more beams and a second group of one or more beams, each of which is associated with the serving cell of the UE; determine to declare a beam fault for the first group of one or more beams based on a channel metric associated with the first group of one or more beams falling below a threshold criterion; select one or more of a first uplink control resource or a second uplink control resource for transmitting a recovery request message in response to determining to declare the beam fault; and transmit the recovery request message via the selected uplink control resource.

[0155] Communication manager 615 may also establish connections with at least a first transmit / receive point using a first set of one or more beams and with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determine to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identify candidate beams associated with either the first or second transmit / receive point that have associated channel metrics satisfying the threshold criterion; and transmit a beam fault recovery message to either the first or second transmit / receive point, indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam. Communication manager 615 may be an example of aspects of communication manager 910 described herein.

[0156] The communication manager 615 may be implemented as described herein to achieve one or more potential advantages. One implementation may allow device 605 to provide BFD indication and candidate beams for a specific TRP in an Scell ​​using multiple TRPs, which can enhance the overall channel quality of the Scell ​​and allow indication of a faulty beam for a specific TRP prior to the overall failure of the Scell. Furthermore, such an implementation may allow device 605 to improve communication reliability, throughput, and user experience, while reducing overall power consumption, among other advantages.

[0157] The communication manager 615 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 615 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0158] The communication manager 615 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 615 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 615 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0159] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 may coexist with receiver 610 in a transceiver module. For example, transmitter 620 may be a reference... Figure 9 Examples of various aspects of the transceiver 920 described. The transmitter 620 may utilize a single antenna or an array of antennas.

[0160] Figure 7 A block diagram 700 illustrates an apparatus 705 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to aspects of this disclosure. Apparatus 705 may be an example of aspects of apparatus 605 or UE 115 as described herein. Apparatus 705 may include a receiver 710, a communication manager 715, and a transmitter 745. Apparatus 705 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0161] Receiver 710 can 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 beam fault recovery techniques for multiple transmit / receive points in a sub-cell). This information can be transmitted to other components of device 705. Receiver 710 can be a reference... Figure 9 Examples of various aspects of the transceiver 920 described. The receiver 710 may utilize a single antenna or an array of antennas.

[0162] Communication manager 715 may be an example of aspects of communication manager 615 as described herein. Communication manager 715 may include connection manager 720, beam fault detection manager 725, resource selection manager 730, beam recovery manager 735, and candidate beam detection manager 740. Communication manager 715 may be an example of aspects of communication manager 910 as described herein.

[0163] In some scenarios, the connection manager 720 may use a first group of one or more beams and a second group of one or more beams to establish a connection, wherein each of the first group of one or more beams and the second group of one or more beams is associated with the UE's serving cell. The beam fault detection manager 725 may determine to declare a beam fault for the first group of one or more beams based on a channel metric associated with the first group of one or more beams falling below a threshold criterion. The resource selection manager 730 may select one or more of a first uplink control resource or a second uplink control resource for transmitting a recovery request message in response to determining that a beam fault should be declared. The beam recovery manager 735 may transmit the recovery request message via the selected uplink control resource.

[0164] In some scenarios, the connection manager 720 may establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE. The beam fault detection manager 725 may determine to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion. The candidate beam detection manager 740 may identify candidate beams associated with either the first or second transmit / receive point that have associated channel metrics that satisfy the threshold criterion. The beam recovery manager 735 may transmit a beam fault recovery message to either the first or second transmit / receive point, indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0165] Transmitter 745 can transmit signals generated by other components of device 705. In some examples, transmitter 745 may coexist with receiver 710 in a transceiver module. For example, transmitter 745 may be a reference... Figure 9 Examples of various aspects of the transceiver 920 described. The transmitter 745 may utilize a single antenna or an array of antennas.

[0166] Figure 8 A block diagram 800 of a communication manager 805 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to aspects of this disclosure, is shown. The communication manager 805 may be an example of aspects of the communication manager 615, communication manager 715, or communication manager 910 described herein. The communication manager 805 may include a connection manager 810, a beam fault detection manager 815, a resource selection manager 820, a beam recovery manager 825, a candidate beam detection manager 830, a configuration manager 835, and a recovery message manager 840. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0167] The connection manager 810 can establish a connection using a first group of one or more beams and a second group of one or more beams, each of the first group of one or more beams and the second group of one or more beams being associated with the UE's serving cell.

[0168] In some examples, the connection manager 810 may reset a beam for one or more control resource sets using the same control resource set pool index value as the candidate beam identified in the BFR procedure. In some cases, when a secondary cell is configured for uplink control information transmission, the transmission beam used to transmit the uplink control information corresponds to the identified candidate beam, or to a different beam with a control resource set pool index value different from the identified candidate beam.

[0169] The beam fault detection manager 815 can determine to declare a beam fault for the first group of one or more beams based on a channel metric associated with the first group of one or more beams falling below a threshold criterion. In some examples, the beam fault detection manager 815 can measure a first group of one or more reference signals corresponding to the first group of one or more beams and a second group of one or more reference signals corresponding to a second group of one or more beams, wherein the first group of one or more reference signals and the first group of one or more beams are associated with a first control resource set pool index value, and the second group of one or more reference signals and the second group of one or more beams are associated with a second control resource set pool index value, and wherein determining to declare a beam fault is based on a channel metric associated with the first group of one or more reference signals falling below a threshold criterion.

[0170] Resource selection manager 820 may select one or more of a first uplink control resource or a second uplink control resource for transmission of a recovery request message in response to determining that a beam failure should be declared. In some examples, resource selection manager 820 may select a second uplink control resource associated with a second control resource set pool index value of the serving cell for transmission of the recovery request message. In some examples, resource selection manager 820 may select a first uplink control resource associated with a first control resource set pool index value of the serving cell for transmission of the recovery request message. In some examples, resource selection manager 820 may select the first uplink control resource or the second uplink control resource based on which of the first or second uplink control resources is associated with the lowest control resource set pool index value. In some examples, resource selection manager 820 may transmit different instances of the recovery request message via each of the first and second uplink control resources.

[0171] In some cases, the first uplink control resource is associated with a first scheduling request identifier, and the second uplink control resource is associated with a second scheduling request identifier. In some cases, the first uplink control resource is associated with a first control resource set pool index value, and the second uplink control resource is associated with a second control resource set pool index value. In some cases, the second uplink control resource is selected based on the component carrier used to transmit the recovery request message being in the same frequency band as the serving cell. In some cases, the first uplink control resource is selected based on a feedback configuration that indicates that individual feedback will be provided using the first control resource set pool index value of the serving cell and the second control resource set pool index value of the serving cell. In some cases, when the component carrier used to transmit the recovery request message is in a frequency band different from the serving cell's frequency band, the lowest control resource set pool index value is used to select either the first or second uplink control resource.

[0172] In some cases, each beam in a first group of one or more beams is associated with a first TRP of the serving cell, and a second group of one or more beams is associated with a second TRP of the serving cell. In some cases, a first uplink control resource is associated with the first TRP of the serving cell, and a second uplink control resource is associated with the second TRP of the serving cell. In some cases, a first control resource set pool index value is associated with the first TRP of the serving cell, and a second control resource set pool index value is associated with the second TRP of the serving cell.

[0173] The beam recovery manager 825 may transmit the recovery request message via a selected uplink control resource. In some examples, the beam recovery manager 825 may transmit a beam failure recovery message to either a first or a second transmit / receive point, indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0174] In some examples, the beam recovery manager 825 may receive uplink permission for uplink communication in response to the recovery request message. In some examples, the beam recovery manager 825 may transmit uplink communication in response to receiving the uplink permission, the uplink communication indicating at least the associated control resource set pool index value of the identified candidate beam and serving cell. In some examples, the beam recovery manager 825 may transmit a recovery request message to one or more of a first transmit / receive point (via a first uplink control resource) or a second transmit / receive point (via a second uplink control resource) in response to determining that a beam failure should be declared.

[0175] The candidate beam detection manager 830 can identify candidate beams associated with one of the first transmit / receive points or the second transmit / receive point that have an associated channel metric that satisfies the threshold criterion. In some examples, the candidate beam detection manager 830 can identify candidate beams with an associated channel metric that satisfies the threshold criterion or one or more other criteria.

[0176] In some examples, the candidate beam detection manager 830 may determine the control resource set pool index value of the identified candidate beam, wherein the selected uplink control resource is determined based on the identified candidate beam. In some examples, the candidate beam detection manager 830 may measure one or more first sets of reference signals and one or more second sets of reference signals. In some examples, the candidate beam detection manager 830 may identify the candidate beam based on this measurement.

[0177] In some examples, the candidate beam detection manager 830 may determine, based on configuration information, which of the first or second transmit / receive points is associated with the identified candidate beam. In some cases, the reference signal identifier set is configured at the UE prior to this determination in the reference signal identifier list.

[0178] Configuration manager 835 may receive configuration information indicating a first set of reference signals associated with a first control resource set pool index value and a second set of reference signals associated with a second control resource set pool index value.

[0179] The recovery message manager 840 can format recovery messages associated with BFD. In some cases, the beam failure recovery message is a Media Access Control (MAC) control element and includes a reference signal identifier for the candidate beam, wherein the reference signal identifier indicates the transmit / receive point associated with the candidate beam. In some cases, the beam failure recovery message includes a first set of bits indicating which of the first or second transmit / receive points is associated with the identified candidate beam and a second set of bits indicating the identified candidate beam. In some cases, the first and second set of bits are provided for each of one or more component carriers for which a beam failure has been declared. In some cases, the beam failure recovery message includes a first set of bits indicating which of the first or second transmit / receive points is associated with the identified candidate beam, a second set of bits indicating one or more component carriers for which a beam failure has been declared, and a third set of bits indicating the identified candidate beam.

[0180] In some cases, the beam fault recovery message includes a first set of bits indicating which component carriers in the component carrier set have declared a beam fault, and a second set of bits indicating identified candidate beams associated with each indicated component carrier, wherein the transmit / receive points associated with the identified candidate beams are indicated based on the ordering of the first set of bits. In some cases, the component carrier set is ordered in the first set of bits according to the component carrier index value or control resource set pool index value of the associated component carriers. In some cases, the first set of bits includes several bits based on several component carriers configured for communication with multiple transmit / receive points.

[0181] Figure 9 A diagram of a system 900 including device 905 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Device 905 may be an example of device 605, device 705, or UE 115 as described herein, or a component including such devices. Device 905 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may be in electronic communication via one or more buses (e.g., bus 945).

[0182] The communication manager 910 may establish a connection using a first group of one or more beams and a second group of one or more beams, each of which is associated with the serving cell of the UE; determine to declare a beam fault for the first group of one or more beams based on the channel metric associated with the first group of one or more beams falling below a threshold criterion; select one or more of a first uplink control resource or a second uplink control resource for transmitting a recovery request message in response to determining to declare the beam fault; and transmit the recovery request message via the selected uplink control resource.

[0183] The communication manager 910 may also establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE; determine to declare a beam fault for the first transmit / receive point based on a channel metric associated with the first set of one or more beams falling below a threshold criterion; identify a candidate beam associated with either the first or second transmit / receive point that has an associated channel metric that satisfies the threshold criterion; and transmit a beam fault recovery message to either the first or second transmit / receive point, the beam fault recovery message indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0184] The communication manager 910 can be implemented as described herein to achieve one or more potential advantages. One implementation may allow device 905 to provide BFD indication and candidate beams for a specific TRP in an Scell ​​using multiple TRPs, which can enhance the overall channel quality of the Scell ​​and allow indication of the faulty beam of a specific TRP before the overall failure of the Scell. Furthermore, such an implementation may allow device 905 to improve communication reliability, throughput, and user experience, while reducing overall power consumption, among other advantages.

[0185] The I / O controller 915 manages the input and output signals of the device 905. The I / O controller 915 can also manage peripheral devices not integrated into the device 905. In some cases, the I / O controller 915 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 915 may utilize an operating system, such as... Or another known operating system. In other cases, I / O controller 915 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with device 915 via I / O controller 905 or via hardware components controlled by I / O controller 915.

[0186] Transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 920 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0187] In some cases, a wireless device may include a single antenna 925. However, in other cases, the device may have more than one antenna 925, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0188] Memory 930 may include RAM and ROM. Memory 930 may store computer-readable, computer-executable code 935, including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 930 may, in particular, contain a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0189] Processor 940 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell).

[0190] Code 935 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 935 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 935 may not be directly executed by processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0191] Figure 10 A block diagram 1000 of an apparatus 1005 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell is shown according to aspects of this disclosure. Apparatus 1005 may be an example of aspects of base station 105 as described herein. Apparatus 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1020. Apparatus 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0192] Receiver 1010 can 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 beam fault recovery techniques for multiple transmit / receive points in a sub-cell). This information can be transmitted to other components of device 1005. Receiver 1010 can be a reference... Figure 13 Examples of various aspects of the transceiver 1320 described. The receiver 1010 may utilize a single antenna or an array of antennas.

[0193] The communication manager 1015 can establish communication with the UE via a serving cell, wherein the communication via the serving cell uses at least one or more beams of a first group and one or more beams of a second group of the serving cell; configure a first uplink control resource and a second uplink control resource for transmission of a recovery request message indicating a beam failure of the serving cell at the UE; receive the recovery request message from the UE in the first uplink control resource; and determine, based on the recovery request message, that the UE has declared the beam failure.

[0194] The communication manager 1015 can also establish communication with the UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; communicate with the UE via a candidate beam in response to a beam failure recovery message; configure a beam failure recovery message to be transmitted by the UE, the beam failure recovery message indicating a beam failure at the UE in the secondary cell; and receive the beam failure recovery message from the UE, the beam failure recovery message indicating which of the candidate beams and the first or second transmit / receive point is associated with the candidate beam. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0195] The communication manager 1015 or its sub-components may be implemented in hardware, code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functionality of the communication manager 1015 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0196] The communication manager 1015 or its subcomponents may be physically located at various locations, including being distributed such that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 1015 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 1015 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0197] Transmitter 1020 can transmit signals generated by other components of device 1005. In some examples, transmitter 1020 may coexist with receiver 1010 in a transceiver module. For example, transmitter 1020 may be a reference... Figure 13 Examples of various aspects of the transceiver 1320 described. The transmitter 1020 may utilize a single antenna or an array of antennas.

[0198] Figure 11 A block diagram 1100 of an apparatus 1105 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to aspects of this disclosure, is shown. Apparatus 1105 may be an example of aspects of apparatus 1005 or base station 105 as described herein. Apparatus 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1145. Apparatus 1105 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0199] Receiver 1110 can 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 beam fault recovery techniques for multiple transmit / receive points in a sub-cell). This information can be transmitted to other components of device 1105. Receiver 1110 can be a reference... Figure 13 Examples of various aspects of the transceiver 1320 described. The receiver 1110 may utilize a single antenna or an array of antennas.

[0200] Communication manager 1115 may be an example of aspects of communication manager 1015 as described herein. Communication manager 1115 may include connection manager 1120, configuration manager 1125, recovery message manager 1130, beam fault detection manager 1135, and candidate beam detection manager 1140. Communication manager 1115 may be an example of aspects of communication manager 1310 as described herein.

[0201] In some scenarios, the connection manager 1120 may establish communication with the UE via a serving cell, wherein the communication via the serving cell uses at least one or more beams from a first set and one or more beams from a second set of the serving cell. The configuration manager 1125 may configure a first uplink control resource and a second uplink control resource for the transmission of a recovery request message indicating a beam failure at the UE. The recovery message manager 1130 may receive the recovery request message from the UE in the first uplink control resource. The beam failure detection manager 1135 may determine, based on the recovery request message, that the UE has declared a beam failure.

[0202] In some scenarios, the connection manager 1120 can establish communication with the UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam, and communicates with the UE via a candidate beam in response to a beam failure recovery message. The recovery message manager 1130 can configure a beam failure recovery message to be transmitted by the UE, indicating a beam failure at the UE in the secondary cell. The candidate beam detection manager 1140 can receive the beam failure recovery message from the UE, indicating which candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0203] Transmitter 1145 can transmit signals generated by other components of device 1105. In some examples, transmitter 1145 may coexist with receiver 1110 in a transceiver module. For example, transmitter 1145 may be a reference... Figure 13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1145 may utilize a single antenna or an array of antennas.

[0204] Figure 12A block diagram 1200 is shown of a communication manager 1205 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to aspects of this disclosure. The communication manager 1205 may be an example of aspects of the communication manager 1015, communication manager 1115, or communication manager 1310 described herein. The communication manager 1205 may include a connection manager 1210, a configuration manager 1215, a recovery message manager 1220, a beam fault detection manager 1225, a resource selection manager 1230, a beam recovery manager 1235, and a candidate beam detection manager 1240. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0205] The connection manager 1210 can establish communication with the UE via a serving cell, wherein the communication via the serving cell uses at least one or more beams from a first set and one or more beams from a second set of the serving cell.

[0206] In some cases, the connection manager 1210 may establish communication with the UE via a primary cell and a secondary cell, wherein the communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam.

[0207] In some examples, the connection manager 1210 may communicate with the UE via a candidate beam in response to a beam failure recovery message. In some examples, the connection manager 1210 may communicate with the UE using an identified candidate beam after receiving uplink control channel communication.

[0208] Configuration manager 1215 can configure first and second uplink control resources for the transmission of a recovery request message indicating a beam fault in the serving cell at the UE. In some examples, configuration manager 1215 can configure a first fault detection resource set corresponding to a first control resource set pool index for a first transmit / receive point and a second fault detection resource set corresponding to a second control resource set pool index for a second transmit / receive point, wherein the beam fault recovery message is communicated using the fault detection resource set corresponding to either the first or second transmit / receive point. In some cases, a reference signal identifier set is configured at the UE in a reference signal identifier list.

[0209] The recovery message manager 1220 may receive the recovery request message from the UE in the first uplink control resource. In some examples, the recovery message manager 1220 may be configured to transmit a beam failure recovery message for the UE, indicating a beam failure of the subcell at the UE. In some cases, the beam failure recovery message is a media access control (MAC) element and includes a reference signal identifier for a candidate beam, wherein the reference signal identifier indicates the transmit / receive point associated with the candidate beam.

[0210] In some cases, the beam failure recovery message includes a first set of bits indicating which of the first or second transmit / receive point is associated with the identified candidate beam, and a second set of bits indicating the identified candidate beam. In some cases, the first and second set of bits are provided for each of one or more component carriers for which a beam failure has been declared.

[0211] In some cases, a beam failure recovery message includes a first set of bits indicating which of the first or second transmit / receive points is associated with the identified candidate beam, a second set of bits indicating one or more component carriers for which a beam failure has been declared, and a third set of bits indicating the identified candidate beam.

[0212] In some cases, the beam fault recovery message includes a first set of bits indicating which component carriers in the component carrier set have declared a beam fault, and a second set of bits indicating the identified candidate beams associated with each indicated component carrier, wherein the transmit / receive point associated with the identified candidate beams is indicated based on the order of the first set of bits.

[0213] In some cases, the component carrier set is ordered in the first bit set based on the component carrier index of the associated component carrier and the control resource set pool index value. In some cases, the first bit set includes several bits based on several component carriers configured for communication with multiple transmit and receive points. In some cases, the format of the beam recovery message is selected from two or more available formats based on several component carriers configured for communication with multiple transmit and receive points.

[0214] The beam failure detection manager 1225 can determine, based on the recovery request message, that the UE has declared a beam failure. The candidate beam detection manager 1240 can receive the beam failure recovery message from the UE, which indicates which candidate beam and which of the first or second transmit / receive points is associated with the candidate beam.

[0215] Resource selection manager 1230 can be configured with two or more control resource sets having reference signal identifiers associated with a first transmit / receive point of the serving cell or a second transmit / receive point of the serving cell, wherein beam failure is based on a channel metric associated with the first reference signal being below a threshold criterion, and wherein the first uplink control resource is determined based on the control resource set of the candidate beam indicated in the recovery request message. In some examples, different instances of the recovery request message are received via each of the first and second uplink control resources.

[0216] In some cases, a first uplink control resource is associated with a first scheduling request identifier, and a second uplink control resource is associated with a second scheduling request identifier, wherein the recovery request message indicates either the first scheduling request identifier or the second scheduling request identifier. In some cases, the first uplink control resource is associated with a first control resource set pool index value for a first beam in a first group of one or more beams, and the second uplink control resource is associated with a second control resource set pool index value for a second beam in a second group of one or more beams. In some cases, the second uplink control resource is associated with a second TRP for transmitting the recovery request message. In some cases, the second uplink control resource is selected based on the component carrier used to transmit the recovery request message being in the same frequency band as the first beam in the first group of one or more beams and the second beam in the second group of one or more beams.

[0217] In some cases, the first uplink control resource associated with the first transmit / receive point is selected for resuming the transmission of the request message. In other cases, the first uplink control resource is selected based on a feedback configuration that indicates that separate feedback will be provided to communications from both the first and second transmit / receive points.

[0218] In some cases, the selection of the first or second uplink control resource is based on which of the first or second uplink control resources is associated with the lowest control resource set pool index value. In some cases, when the component carrier used to transmit the recovery request message is in a different frequency band than the first beam in one or more first groups of beams and the second beam in one or more second groups of beams, the lowest control resource set pool index value is used to select the first or second uplink control resource.

[0219] The beam recovery manager 1235 may, in response to the recovery request message, transmit an uplink grant to the UE for uplink communication. In some examples, the beam recovery manager 1235 may, in response to the uplink grant, receive uplink communication indicating the associated control resource set pool index value of the candidate beam and the serving cell.

[0220] In some examples, the beam recovery manager 1235 may receive a recovery request message before receiving a beam failure recovery message. In some examples, the beam recovery manager 1235 may transmit uplink permission to the UE for the beam failure recovery message.

[0221] Figure 13 A diagram of a system 1300 including device 1305 supporting beam fault recovery technology for multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Device 1305 may be an example of device 1005, device 1105, or base station 105 as described herein, or a component including the aforementioned devices. Device 1305 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-site communication manager 1345. These components may be in electronic communication via one or more buses (e.g., bus 1350).

[0222] The communication manager 1310 can establish communication with the UE via a serving cell, wherein the communication via the serving cell uses at least one or more beams of a first group and one or more beams of a second group of the serving cell; configure a first uplink control resource and a second uplink control resource for transmission of a recovery request message indicating a beam failure of the serving cell at the UE; receive the recovery request message from the UE in the first uplink control resource; and determine, based on the recovery request message, that the UE has declared the beam failure.

[0223] The communication manager 1310 can also establish communication with the UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam; communicate with the UE via a candidate beam in response to a beam failure recovery message; configure a beam failure recovery message to be transmitted by the UE, the beam failure recovery message indicating a beam failure of the secondary cell at the UE; and receive the beam failure recovery message from the UE, the beam failure recovery message indicating which of the candidate beam and the first or second transmit / receive point is associated with the candidate beam.

[0224] The network communication manager 1315 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1315 can manage the delivery of data communication by client devices (such as one or more UEs 115).

[0225] Transceiver 1320 can communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, transceiver 1320 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1320 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and to demodulate packets received from the antenna.

[0226] In some cases, the wireless device may include a single antenna 1325. However, in other cases, the device may have more than one antenna 1325, which may be able to transmit or receive multiple wireless transmissions concurrently.

[0227] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer-readable code 1335 including instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform the various functions described herein. In some cases, memory 1330 may particularly include a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0228] Processor 1340 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1340 may be configured to use a memory controller to operate a memory array. In some cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks supporting beam fault recovery techniques for multiple transmit / receive points in a sub-cell).

[0229] Inter-site communication manager 1345 manages communication with other base stations 105 and may include a controller or scheduler for cooperating with other base stations 105 to control communication with UE 115. For example, inter-site communication manager 1345 may coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, inter-site communication manager 1345 may provide an X2 interface within LTE / LTE-A wireless communication network technology to facilitate communication between base stations 105.

[0230] Code 1335 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 1335 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1335 may not be directly executed by processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0231] Figure 14 A flowchart illustrating a method 1400 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1400 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0232] In step 1405, the UE can establish a connection using a first set of one or more beams and a second set of one or more beams, each of which is associated with the UE's serving cell. Operation of step 1405 can be performed according to the methods described herein. In some examples, aspects of operation of step 1405 can be described as follows: Figures 6 to 9 The described connection manager is used to execute this.

[0233] In step 1410, the UE can determine whether to declare a beam fault for the first group of one or more beams based on the channel metric associated with the first group of one or more beams falling below a threshold criterion. The operation of step 1410 can be performed according to the methods described herein. In some examples, aspects of the operation of step 1410 can be determined by referring to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0234] At 1415, the UE may, in response to determining that it wants to declare the beam failure, select one or more of the first uplink control resource or the second uplink control resource for transmitting the recovery request message. The operation of 1415 may be performed according to the methods described herein. In some examples, aspects of the operation of 1415 may be determined by reference to... Figures 6 to 9 The resource selection manager described is used to execute this.

[0235] At 1420, the UE may transmit the recovery request message via the selected uplink control resource. The operation of 1420 can be performed according to the methods described herein. In some examples, aspects of the operation of 1420 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0236] Figure 15 A flowchart illustrating a method 1500 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1500 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1500 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0237] In 1505, the UE can establish a connection using a first set of one or more beams and a second set of one or more beams, each of the first set of one or more beams and the second set of one or more beams being associated with the UE's serving cell. Operation of 1505 can be performed according to the methods described herein. In some examples, aspects of operation of 1505 can be described as referenced... Figures 6 to 9 The described connection manager is used to execute this.

[0238] In 1510, the UE can measure one or more reference signals corresponding to a first group of one or more beams and one or more reference signals corresponding to a second group of one or more beams. The operation of 1510 can be performed according to the methods described herein. In some examples, aspects of the operation of 1510 can be determined by reference to... Figures 6 to 9 The described beam fault detection manager is used to perform this. In some cases, a first group of one or more reference signals and a first group of one or more beams are associated with a first control resource set pool index value, and a second group of one or more reference signals and a second group of one or more beams are associated with a second control resource set pool index value.

[0239] In step 1515, the UE can determine whether to declare a beam fault for the first group of one or more beams based on the channel metric associated with the first group of one or more beams falling below a threshold criterion. Operation of step 1515 can be performed according to the methods described herein. In some examples, aspects of operation of step 1515 can be determined by reference to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0240] At 1520, the UE may, in response to determining that it wants to declare the beam failure, select one or more of the first uplink control resource or the second uplink control resource for transmitting the recovery request message. The operation of 1520 may be performed according to the methods described herein. In some examples, aspects of the operation of 1520 may be determined by reference to... Figures 6 to 9 The resource selection manager described is used to execute this.

[0241] At 1525, the UE can identify candidate beams with associated channel metrics that satisfy this threshold criterion or one or more other criteria. Operation of 1525 can be performed according to the methods described herein. In some examples, aspects of operation of 1525 can be determined by reference to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0242] At 1530, the UE can determine the control resource set pool index value of the identified candidate beam, wherein the selected uplink control resource is determined based on the identified candidate beam. The operation of 1530 can be performed according to the method described herein. In some examples, aspects of the operation of 1530 can be determined by referring to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0243] In step 1535, the UE may transmit the recovery request message via the selected uplink control resource. The operation of step 1535 can be performed according to the methods described herein. In some examples, aspects of the operation of step 1535 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0244] Figure 16 A flowchart illustrating a method 1600 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1600 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1600 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0245] At 1605, the UE may receive configuration information indicating a first set of reference signals associated with a first control resource set pool index value and a second set of reference signals associated with a second control resource set pool index value. Operation of 1605 may be performed according to the methods described herein. In some examples, aspects of operation of 1605 may be determined by reference to... Figures 6 to 9 The configuration manager described is used to execute this.

[0246] In 1610, the UE can establish a connection using a first set of one or more beams and a second set of one or more beams, wherein each of the first set of one or more beams and the second set of one or more beams is associated with the UE's serving cell. Operation of 1610 can be performed according to the methods described herein. In some examples, aspects of operation of 1610 can be derived from, as referenced... Figures 6 to 9 The described connection manager is used to execute this.

[0247] In 1615, the UE can measure a first set of one or more reference signals and a second set of one or more reference signals. The operation of 1615 can be performed according to the methods described herein. In some examples, aspects of the operation of 1615 can be determined by reference signals such as... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0248] In step 1620, the UE can determine whether to declare a beam fault for the first group of one or more beams based on the channel metric associated with the first group of one or more beams falling below a threshold criterion. The operation of step 1620 can be performed according to the methods described herein. In some examples, aspects of the operation of step 1620 can be determined by referring to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0249] In step 1625, the UE can identify candidate beams based on this measurement. Operation of step 1625 can be performed according to the methods described herein. In some examples, aspects of operation of step 1625 can be determined by reference to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0250] At 1630, the UE can determine, based on this configuration information, which of the first control resource set pool index values ​​or the second control resource set pool index value is associated with the identified candidate beam. The operation of 1630 can be performed according to the methods described herein. In some examples, aspects of the operation of 1630 can be determined by referring to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0251] In step 1635, the UE may transmit the recovery request message via the selected uplink control resource. The operation of step 1635 can be performed according to the methods described herein. In some examples, aspects of the operation of step 1635 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0252] Figure 17A flowchart illustrating a method 1700 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1700 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1700 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0253] In 1705, a UE can establish a connection using a first set of one or more beams and a second set of one or more beams, wherein each of the first set of one or more beams and the second set of one or more beams is associated with the UE's serving cell. Operation of 1705 can be performed according to the methods described herein. In some examples, aspects of operation of 1705 can be described by referring to... Figures 6 to 9 The described connection manager is used to execute this.

[0254] In 1710, the UE can determine whether to declare a beam fault for the first group of one or more beams based on the channel metric associated with the first group of one or more beams falling below a threshold criterion. The operation of 1710 can be performed according to the methods described herein. In some examples, aspects of the operation of 1710 can be determined by referring to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0255] In step 1715, the UE may, in response to determining that it wants to declare a beam failure, select one or more of the first or second uplink control resources for transmitting the recovery request message. Operation of step 1715 may be performed according to the methods described herein. In some examples, aspects of operation of step 1715 may be determined by reference to... Figures 6 to 9 The resource selection manager described is used to execute this.

[0256] At 1720, the UE may transmit the recovery request message via the selected uplink control resource. The operation of 1720 can be performed according to the methods described herein. In some examples, aspects of the operation of 1720 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0257] At 1725, the UE may receive uplink permission for uplink communication in response to the recovery request message. The operation of 1725 may be performed according to the methods described herein. In some examples, aspects of the operation of 1725 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0258] At 1730, the UE may transmit uplink communication in response to receiving the uplink grant, the uplink communication indicating at least the associated control resource set pool index value of the identified candidate beam and serving cell. Operation of 1730 may be performed according to the methods described herein. In some examples, aspects of the operation of 1730 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0259] In 1735, the UE may use the identified candidate beam to communicate with one or more of the first transmit / receive point or the second transmit / receive point of the serving cell after the transmission of the uplink communication. Operation of 1735 may be performed according to the methods described herein. In some examples, aspects of the operation of 1735 may be as described in reference... Figures 6 to 9 The described connection manager is used to execute this.

[0260] Figure 18 A flowchart illustrating a method 1800 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1800 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1800 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0261] In 1805, the UE may establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE. Operation of 1805 may be performed according to the methods described herein. In some examples, aspects of operation of 1805 may be provided as referenced... Figures 6 to 9 The described connection manager is used to execute this.

[0262] In step 1810, the UE can determine whether to declare a beam fault for the first transmit / receive point based on the channel metric associated with one or more beams falling below a threshold criterion. Operation of step 1810 can be performed according to the methods described herein. In some examples, aspects of operation of step 1810 can be determined by reference to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0263] In step 1815, the UE can identify a candidate beam associated with either the first or second transmit / receive point, having an associated channel metric that satisfies the threshold criterion. Operation of step 1815 can be performed according to the methods described herein. In some examples, aspects of operation of step 1815 can be determined by reference to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0264] At 1820, the UE may transmit a beam fault recovery message to either the first or second transmit / receive point, indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam. Operation of 1820 may be performed according to the methods described herein. In some examples, aspects of operation of 1820 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0265] Figure 19 A flowchart illustrating a method 1900 for beam fault recovery technology supporting multiple transmit / receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 1900 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1900 can be implemented by, as referred to... Figures 6 to 9 The described communication manager is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the following functions. Alternatively or alternatively, the UE can use dedicated hardware to perform aspects of the following functions.

[0266] In 1905, the UE can establish a connection with at least a first transmit / receive point using a first set of one or more beams and establish a connection with a second transmit / receive point using a second set of one or more beams, wherein each of the first and second transmit / receive points is associated with a subcell for communication at the UE. Operation of 1905 can be performed according to the methods described herein. In some examples, aspects of operation of 1905 can be derived from, as referenced... Figures 6 to 9 The described connection manager is used to execute this.

[0267] In 1910, the UE can measure one or more reference signals corresponding to a first group of one or more beams and one or more reference signals corresponding to a second group of one or more beams. Operation of 1910 can be performed according to the methods described herein. In some examples, aspects of operation of 1910 can be determined by reference to... Figures 6 to 9The described beam fault detection manager is used to perform this. In some cases, a first group of one or more reference signals and a first group of one or more beams are associated with a first control resource set pool index value, and a second group of one or more reference signals and a second group of one or more beams are associated with a second control resource set pool index value.

[0268] In 1915, the UE can determine whether to declare a beam fault for the first transmit / receive point based on the channel metric associated with one or more beams falling below a threshold criterion. Operation of 1915 can be performed according to the methods described herein. In some examples, aspects of operation of 1915 can be determined by referring to... Figures 6 to 9 The described beam fault detection manager is used to perform this.

[0269] In step 1920, the UE may, in response to determining that it wants to declare a beam failure, transmit a recovery request message to one or more of the first transmit / receive point (via the first uplink control resource) or the second transmit / receive point (via the second uplink control resource). Operation of step 1920 may be performed according to the methods described herein. In some examples, aspects of operation of step 1920 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0270] In 1925, the UE can identify a candidate beam associated with either the first or second transmit / receive point, having an associated channel metric that satisfies the threshold criterion. Operation of 1925 can be performed according to the methods described herein. In some examples, aspects of operation of 1925 can be determined by reference to... Figures 6 to 9 The described candidate beam detection manager is used to perform this.

[0271] In step 1930, the UE may transmit a beam fault recovery message to either the first or second transmit / receive point, indicating the candidate beam and which of the first or second transmit / receive points is associated with the candidate beam. Operation of step 1930 may be performed according to the methods described herein. In some examples, aspects of operation of step 1930 may be determined by reference to... Figures 6 to 9 The described beam recovery manager is used to perform this.

[0272] In 1935, the UE can communicate with one or more of the first or second transmit / receive points using the identified candidate beam after the transmission of the beam failure recovery message. Operation of 1935 can be performed according to the methods described herein. In some examples, aspects of operation of 1935 can be described as follows: Figures 6 to 9The described connection manager is used to perform this. In some cases, communication using the identified candidate beam is initiated by resetting the beam for one or more control resource sets using the same value as the control resource set pool index value of the identified candidate beam.

[0273] Figure 20 A flowchart illustrating a method 2000 for beam fault recovery technology supporting multiple transmit and receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 2000 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2000 can be implemented by referring to... Figures 10 to 13 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0274] In 2005, a base station can establish communication with a UE via a serving cell, wherein the communication via the serving cell uses at least one or more beams from a first set and one or more beams from a second set of the serving cell. Operation of 2005 can be performed according to the methods described herein. In some examples, aspects of operation of 2005 can be derived from, as referenced... Figures 10 to 13 The described connection manager is used to execute this.

[0275] In 2010, the base station can configure first and second uplink control resources for the transmission of a recovery request message indicating a beamout failure of the serving cell at the UE. Operation of 2010 can be performed according to the methods described herein. In some examples, aspects of operation of 2010 can be determined by referring to... Figures 10 to 13 The configuration manager described is used to execute this.

[0276] In 2015, the base station can receive the recovery request message from the UE in the first uplink control resource. The operation of 2015 can be performed according to the method described herein. In some examples, aspects of the operation of 2015 can be determined by referring to... Figures 10 to 13 The described recovery message manager is used to perform this.

[0277] In 2020, the base station can determine that the UE has declared a beam failure based on the recovery request message. Operation in 2020 can be performed according to the methods described herein. In some examples, aspects of operation in 2020 can be determined by referring to... Figures 10 to 13 The described beam fault detection manager is used to perform this.

[0278] Figure 21A flowchart illustrating a method 2100 for beam fault recovery techniques supporting multiple transmit and receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 2100 may be implemented by a base station 105 or its components as described herein. For example, operation of method 2100 may be implemented by, as referred to... Figures 10 to 13 The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0279] In 2105, the base station can establish communication with the UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam. Operation of 2105 can be performed according to the methods described herein. In some examples, aspects of operation of 2105 can be derived from, as referenced... Figures 10 to 13 The described connection manager is used to execute this.

[0280] In 2110, the base station can be configured to transmit a beam fault recovery message for the UE, which indicates a beam fault at the UE in the sub-cell. Operation of 2110 can be performed according to the methods described herein. In some examples, aspects of the operation of 2110 can be determined by referring to... Figures 10 to 13 The described recovery message manager is used to perform this.

[0281] At 2115, the base station can receive the beam failure recovery message from the UE, which indicates which candidate beam and which of the first or second transmit / receive point is associated with the candidate beam. Operation of 2115 can be performed according to the methods described herein. In some examples, aspects of the operation of 2115 can be determined by referring to... Figures 10 to 13 The described candidate beam detection manager is used to perform this.

[0282] At 2120, the base station can communicate with the UE via the candidate beam in response to the beam failure recovery message. The operation of 2120 can be performed according to the methods described herein. In some examples, aspects of the operation of 2120 can be derived from, as referenced... Figures 10 to 13 The described connection manager is used to execute this.

[0283] Figure 22 A flowchart illustrating a method 2200 for beam fault recovery techniques supporting multiple transmit and receive points in a sub-cell, according to various aspects of this disclosure, is shown. Operation of method 2200 can be implemented by a base station 105 or its components as described herein. For example, operation of method 2200 can be implemented by referring to... Figures 10 to 13The described communication manager is used to perform this. In some examples, the base station can execute a set of instructions to control the functional elements of the base station to perform the following functions. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the following functions.

[0284] In 2205, the base station can establish communication with the UE via a primary cell and a secondary cell, wherein communication via the secondary cell uses a first transmit / receive point using at least a first beam and a second transmit / receive point using a second beam. Operation of 2205 can be performed according to the methods described herein. In some examples, aspects of operation of 2205 can be derived from, as referenced... Figures 10 to 13 The described connection manager is used to execute this.

[0285] In 2210, the base station can be configured with a first fault detection resource set corresponding to a first control resource set pool index for a first transmit / receive point and a second fault detection resource set corresponding to a second control resource set pool index for a second transmit / receive point, wherein a beam fault recovery message is conveyed using the fault detection resource set corresponding to either the first or second transmit / receive point. Operation of 2210 can be performed according to the methods described herein. In some examples, aspects of the operation of 2210 can be described by referring to... Figures 10 to 13 The configuration manager described is used to execute this.

[0286] In 2215, the base station can be configured to transmit a beam fault recovery message for the UE, which indicates a beam fault at the UE in the sub-cell. Operation of 2215 can be performed according to the methods described herein. In some examples, aspects of the operation of 2215 can be determined by referring to... Figures 10 to 13 The described recovery message manager is used to perform this.

[0287] At 2220, the base station can receive recovery request messages. The operation of 2220 can be performed according to the methods described herein. In some examples, aspects of the operation of 2220 can be derived from, as referenced... Figures 10 to 13 The described beam recovery manager is used to perform this.

[0288] At 2225, the base station may transmit uplink permission to the UE for the beam fault recovery message. The operation of 2225 may be performed according to the methods described herein. In some examples, aspects of the operation of 2225 may be determined by reference to... Figures 10 to 13 The described beam recovery manager is used to perform this.

[0289] At 2230, the base station can receive the beam failure recovery message from the UE, the beam failure recovery message indicating which candidate beam and which of the first or second transmit / receive point is associated with the candidate beam. Operation of 2230 can be performed according to the methods described herein. In some examples, aspects of the operation of 2230 can be determined by referring to... Figures 10 to 13 The described candidate beam detection manager is used to perform this.

[0290] In 2235, the base station can communicate with the UE via the candidate beam in response to the beam failure recovery message. The operation of 2235 can be performed according to the methods described herein. In some examples, aspects of the operation of 2235 can be derived from, as referenced... Figures 10 to 13 The described connection manager is used to execute this.

[0291] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects from two or more methods can be combined.

[0292] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can also be applied to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0293] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0294] The various illustrative boxes and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but in alternatives, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors working in conjunction with a DSP core, or any other such configuration).

[0295] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations fall within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that different parts of the function are implemented at different physical locations.

[0296] Computer-readable media includes both non-transient computer storage media and communication media, encompassing any medium that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example and not limitation, non-transient computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transient medium that can be used to carry or store desired program code in the form of instructions or data structures and is accessible to a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Similarly, any connection is also legitimately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then such coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable media. As used in this article, disk and disc include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks often magnetically reproduce data while discs optically reproduce data using lasers. Combinations of these media are also included within the scope of computer-readable media.

[0297] As used herein (including in the claims), the word "or" in an enumeration of items (e.g., an enumeration of items accompanied by phrases such as "at least one of" or "one or more of") indicates an inclusive enumeration, such that an enumeration of at least one of, for example, A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be interpreted as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0298] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, components of the same type may be distinguished by a dash following the reference numeral and a second reference numeral used to differentiate between similar components. If only the first reference numeral is used in the description, the description may apply to any of the similar components having the same first reference numeral, regardless of the second reference numeral or other subsequent reference numerals.

[0299] This document, illustrated with reference to the accompanying drawings, describes exemplary configurations but does not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not imply "superior" or "outperforming" other examples. This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0300] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the universal principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories, wherein the one or more processors are configured so as to cause the UE, upon execution of the code, to: establish a connection with the UE via a primary cell and a secondary cell, wherein communications via the secondary cell use a first transmission reception point using a first set of one or more beams and a second transmission reception point using a second set of one or more beams; receive reference signals via a first set of failure detection resources, a second set of failure detection resources, a first set of candidate beam resources associated with the first set of failure detection resources, and a second set of candidate beam resources associated with the second set of failure detection resources; detect a beam failure based at least in part on a radio link quality associated with the first set of failure detection resources or the second set of failure detection resources; transmit a recovery request message via at least one uplink control resource associated with beam failure recovery at the secondary cell based at least in part on detecting the beam failure; transmit a failure recovery message in accordance with the recovery request message, the failure recovery message indicating the secondary cell on which the beam failure was detected, whether the beam failure was detected for one or both of the first transmission reception point of the secondary cell or the second transmission reception point of the secondary cell, a candidate beam associated with the first set of candidate beam resources or the second set of candidate beam resources, and whether the candidate beam corresponds to the first transmission reception point or the second transmission reception point, wherein the failure recovery message comprises a medium access control - control element having a plurality of fields, each field of the plurality of fields indicating beam failure detection information with respect to a respective cell, wherein the plurality of fields are ordered with respect to a secondary cell index of a respective cell, wherein the one or more processors are further configured so as to cause the UE to: measure a first set of one or more reference signals corresponding to the first set of one or more beams and a second set of one or more reference signals corresponding to the second set of one or more beams, wherein the first set of one or more reference signals and the first set of one or more beams are associated with a first control resource set pool index value, and wherein the second set of one or more reference signals and the second set of one or more beams are associated with a second control resource set pool index value, and wherein the declaration of beam failure is based at least in part on a first power measurement associated with the first set of one or more reference signals being below a threshold value; identify the candidate beam based on an associated channel metric of the candidate beam satisfying the threshold value or one or more other criteria; and determine a control resource set pool index value of the candidate beam, wherein the selection of the at least one uplink control resource is based at least in part on the control resource set pool index value of the candidate beam. ​ 2. The apparatus of claim 1, wherein the one or more processors are further configured to cause the UE to: transmit an indication of a beam failure declaration for the first set of one or more beams of the secondary cell, wherein to identify the candidate beam, the one or more processors are further configured to cause the UE to identify the candidate beam from a set of candidate beams associated with the first control resource set pool index value for which the beam failure is declared.

3. The apparatus of claim 1, wherein, the first control resource set pool index value is associated with the first transmission reception point of the secondary cell and the second control resource set pool index value is associated with the second transmission reception point of the secondary cell.

4. An apparatus for wireless communication at a user equipment (UE), comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories and configured to cause the UE, upon execution of the code, to: establish a connection with the UE via a primary cell and a secondary cell, wherein communications via the secondary cell use at least a first transmission reception point using a first set of one or more beams and a second transmission reception point using a second set of one or more beams; receive reference signals via a first failure detection resource set, a second failure detection resource set, a first candidate beam resource set associated with the first failure detection resource set, and a second candidate beam resource set associated with the second failure detection resource set; detect a beam failure based at least in part on a radio link quality associated with the first failure detection resource set or the second failure detection resource set; transmit, based at least in part on detecting the beam failure, a recovery request message via at least one uplink control resource associated with beam failure recovery at the secondary cell; transmit, in accordance with the recovery request message, a failure recovery message indicating the secondary cell on which the beam failure was detected, whether the beam failure was detected for one or both of the first transmission reception point of the secondary cell or the second transmission reception point of the secondary cell, a candidate beam associated with the first candidate beam resource set or the second candidate beam resource set, and whether the candidate beam corresponds to the first transmission reception point or the second transmission reception point, wherein the failure recovery message comprises a medium access control-control element having a plurality of fields, each field of the plurality of fields indicating beam failure detection information about a respective cell, wherein the plurality of fields are ordered with respect to a secondary cell index of the respective cell, wherein the one or more processors are further configured to cause the UE to: receive configuration information indicating a first set of reference signals associated with a first control resource set pool index value and a second set of reference signals associated with a second control resource set pool index value; measure the first set of one or more reference signals and the second set of one or more reference signals; identify a candidate beam based at least in part on the measurements; and determine which of the first control resource set pool index value or the second control resource set pool index value is associated with the identified candidate beam based at least in part on the configuration information.

5. An apparatus for wireless communication at a user equipment (UE), comprising one or more memories storing processor-executable code, and one or more processors coupled with the one or more memories, wherein the one or more processors are configured to cause the UE, upon execution of the code: establish a connection with the UE via a primary cell and a secondary cell, wherein communications via the secondary cell use a first transmission reception point using a first set of one or more beams and a second transmission reception point using a second set of one or more beams; receive reference signals via a first failure detection resource set, a second failure detection resource set, a first candidate beam resource set associated with the first failure detection resource set, and a second candidate beam resource set associated with the second failure detection resource set; detect a beam failure based at least in part on a radio link quality associated with the first failure detection resource set or the second failure detection resource set; transmit a recovery request message via a first uplink control resource or a second uplink control resource associated with a beam failure recovery at the secondary cell based at least in part on detecting the beam failure; transmit a failure recovery message in accordance with the recovery request message, the failure recovery message indicating the secondary cell on which the beam failure was detected, whether the beam failure was detected for one or both of the first transmission reception point of the secondary cell or the second transmission reception point of the secondary cell, a candidate beam associated with the first candidate beam resource set or the second candidate beam resource set, and whether the candidate beam corresponds to the first transmission reception point or the second transmission reception point, wherein the failure recovery message comprises a medium access control-control element having a plurality of fields, each field of the plurality of fields indicating beam failure detection information about a respective cell, wherein the plurality of fields are ordered with respect to a secondary cell index of a respective cell, wherein the one or more processors are further configured to cause the UE to: select the first uplink control resource or the second uplink control resource for transmission of the recovery request message based at least in part on which of the first uplink control resource or the second uplink control resource is associated with a lowest control resource set pool index value.

6. The apparatus of claim 5, wherein, To select the first uplink control resource or the second uplink control resource, the one or more processors are configured to cause the UE to use the lowest control resource set pool index value to select the first uplink control resource or the second uplink control resource when the secondary cell and a component carrier used to transmit the recovery request message are associated with different frequency bands.

7. A method for wireless communication at a user equipment (UE), comprising: establishing a connection with the UE via a primary cell and a secondary cell, wherein communications via the secondary cell use a first transmission reception point using a first set of one or more beams and a second transmission reception point using a second set of one or more beams; receiving reference signals via a first set of failure detection resources, a second set of failure detection resources, a first set of candidate beam resources associated with the first set of failure detection resources, and a second set of candidate beam resources associated with the second set of failure detection resources; detecting a beam failure based at least in part on a radio link quality associated with the first set of failure detection resources or the second set of failure detection resources; transmitting a recovery request message via a first uplink control resource or a second uplink control resource associated with a beam failure recovery at the secondary cell based at least in part on detecting the beam failure; transmitting a failure recovery message in accordance with the recovery request message, the failure recovery message indicating the secondary cell on which the beam failure was detected, whether the beam failure was detected for one or both of a first transmission reception point of the secondary cell or a second transmission reception point of the secondary cell, a candidate beam associated with the first set of candidate beam resources or the second set of candidate beam resources, and whether the candidate beam corresponds to the first transmission reception point or the second transmission reception point, wherein the failure recovery message comprises a medium access control-control element having a plurality of fields, each field of the plurality of fields indicating beam failure detection information with respect to a respective cell, wherein the plurality of fields are ordered with respect to a secondary cell index of a respective cell, wherein the method further comprises: (a) measuring a first set of one or more reference signals corresponding to the first set of one or more beams and a second set of one or more reference signals corresponding to the second set of one or more beams, wherein the first set of one or more reference signals and the first set of one or more beams are associated with a first control resource set pool index value, and wherein the second set of one or more reference signals and the second set of one or more beams are associated with a second control resource set pool index value, and wherein the declaration of beam failure is based at least in part on a first power measurement associated with the first set of one or more reference signals being below a threshold value; identifying the candidate beam based on an associated channel metric of the candidate beam satisfying the threshold value or one or more other criteria; and determining a control resource set pool index value of the candidate beam, wherein the selection of the at least one uplink control resource is based at least in part on the control resource set pool index value of the candidate beam; or (b) receiving configuration information indicating a first set of one or more reference signals associated with a first control resource set pool index value and a second set of one or more reference signals associated with a second control resource set pool index value; measuring the first set of one or more reference signals and the second set of one or more reference signals; identifying a candidate beam based at least in part on the measuring; and determining which of the first control resource set pool index value or the second control resource set pool index value is associated with the identified candidate beam based at least in part on the configuration information; or (c) selecting the first uplink control resource or the second uplink control resource for transmission of the recovery request message based at least in part on which of the first uplink control resource or the second uplink control resource is associated with a lowest control resource set pool index value.

8. The method of claim 7, wherein the method further comprises: transmitting an indication of the beam failure for the first set of one or more beams of the secondary cell, wherein the candidate beam is identified from a set of candidate beams associated with the first control resource set pool index value for which the beam failure is declared.

9. The method of claim 7, wherein, the first control resource set pool index value is associated with the first transmission reception point of the secondary cell and the second control resource set pool index value is associated with the second transmission reception point of the secondary cell.

10. The method of claim 7, wherein, the lowest control resource set pool index value is used to select the first uplink control resource or the second uplink control resource when the secondary cell and a component carrier used to transmit the recovery request message are associated with different frequency bands.

Images