Beam failure recovery for multiple transmission / reception points in the primary cell

Abstract

Methods, systems, and apparatus for wireless communications are described. A user equipment (UE) may receive a configuration regarding a carrier associated with a primary cell (PCell), the carrier being configured with a first control resource set (CORESET) pool index value and a second CORESET pool index value. The UE may receive an indication of a set of candidate beams that may be used for a beam failure recovery (BFR) procedure, the set of candidate beams comprising a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value. The UE may detect a beam failure on the carrier on an active beam of the primary cell associated with the first CORESET pool index value or the second CORESET pool index value. The UE may select a new candidate beam from the set of candidate beams.

Description

Technical Field

[0001] The following relates generally to wireless communications and, more particularly, to beam failure recovery for multiple transmit / receive points in a primary cell.

[0002] background

[0003] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems), and fifth generation (5G) systems that may be referred to as new radio (NR) systems. These systems may use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices, which may be referred to as user equipment (UE) in addition.

[0004] In some wireless communication systems, a UE and a base station may communicate on a communication link using a directional beam. Changes in the radio environment between the UE and the base station may degrade the quality of the beams used by the UE and the base station, which may result in communication failures between the UE and the base station. The UE may attempt to perform a beam failure recovery (BFR) procedure to reestablish a connection with the base station. Additionally, in some wireless communication systems, the UE may be in communication with more than one transmit receive point (TRP) (e.g., in a multi-TRP configuration). Each of the more than one TRPs may transmit a downlink transmission to the UE according to the beam configuration, and the UE may decode the downlink transmission from each of the more than one TRPs according to the beam configuration. An efficient BFR procedure in a multi-TRP configuration may help enhance multi-TRP communications.

[0005] Overview

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting beam failure recovery (BFR) for multiple transmission / reception points (TRPs) in a primary cell (PCell), which may be an example of a PCell and / or a primary / secondary cell (P / SCell). In general, the described techniques provide a per-TRP BFR procedure at a PCell configured with a component carrier (CC) associated with two control resource sets (CORESET) pool index values ​​(CORESETPoolIndex). Different CORESET pool index values ​​are configured for user equipment (UE), wherein each CORESET pool index value is associated with a corresponding different TRP of the PCell. The PCell (e.g., a base station) may configure the UE with an indication of a candidate beam set that may be used for the BFR procedure, wherein the candidate beam set includes a first candidate beam subset for a first CORESET pool index value / TRP and a second candidate beam subset for a second CORESET pool index value / TRP. The UE may identify or otherwise detect a beam failure on a CC on a currently active beam of a PCell and select a new candidate beam from a set of candidate beams. For example, the UE may detect a beam failure based on a reference signal from a TRP (e.g., a beam failure detection (BFD) reference signal) failing to meet a threshold performance metric. The reference signal may be associated with a first CORESET pool index value or a second CORESET pool index value. Accordingly, the UE may know that the beam failure is associated with the corresponding first TRP or second TRP, and select a new candidate beam from the corresponding first candidate beam subset or second candidate beam subset, respectively. For example, the UE may measure the candidate beams in the associated candidate beam subset to identify the best performance candidate beam. The UE may select the best performance candidate beam (or N best performance candidate beams) as a new candidate beam. The UE may transmit an access message (e.g., such as a random access channel (RACH) message, a link recovery request (LRR), etc.) indicating the new candidate beam. The BFR procedure may establish the new candidate beam as a new active beam with the corresponding TRP.

[0007] A method for wireless communication at a UE is described. The method may include: receiving a configuration about a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receiving an indication of a set of candidate beams available for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; selecting a new candidate beam from the candidate beam set based at least in part on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; and transmitting an access message indicating the new candidate beam during the BFR procedure.

[0008] 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. The instructions are executable by the processor to cause the processor to: receive a configuration of a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receive an indication of a set of candidate beams available for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; select a new candidate beam from the candidate beam set based at least in part on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; and transmit an access message indicating the new candidate beam during the BFR procedure.

[0009] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: receiving a configuration of a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receiving an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value; detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; selecting a new candidate beam from the set of candidate beams based at least in part on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; and transmitting an access message indicating the new candidate beam during the BFR procedure.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to perform the following operations: receiving a configuration of a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receiving an indication of a set of candidate beams available for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; selecting a new candidate beam from the candidate beam set based at least in part on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; and transmitting an access message indicating the new candidate beam during the BFR procedure.

[0011] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying a first random access resource subset associated with a first candidate beam detection resource subset corresponding to a first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource subset corresponding to a second candidate beam subset, wherein an access message is transmitted based at least in part on the first random access resource set or the second random access resource set.

[0012] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for receiving an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value.

[0013] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining that a new candidate beam is associated with a first candidate beam subset; and selecting a random access resource corresponding to the new candidate beam from the first random access resource set to transmit an access message.

[0014] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: configuring an access message to indicate a first CORESET pool index value or a second CORESET pool index based at least in part on a detected beam failure.

[0015] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: configuring an access message to indicate that a beam failure has been detected on a PCell based at least in part on the detected beam failure; and transmitting the access message using a first random access resource set associated with a first CORESET pool index value or a second random access resource set associated with a second CORESET pool index value.

[0016] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: monitoring access response messages on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value.

[0017] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining that a new candidate beam is associated with a first candidate beam subset; and monitoring access response messages on a first recovery search space.

[0018] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: receiving a control channel signal in a first recovery search space; and determining that the BFR procedure is complete based at least in part on receiving the control channel signal in the first recovery search space.

[0019] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: monitoring access response messages on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value, the first recovery search space and the second recovery search space being associated with a common CORESET.

[0020] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining that a new candidate beam is associated with a first candidate beam subset; and monitoring access response messages in a first recovery search space.

[0021] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: receiving a control channel signal in a first recovery search space; and determining that the BFR procedure is complete based at least in part on receiving the control channel signal in the first recovery search space.

[0022] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: determining that a new candidate beam is associated with a first CORESET pool index value or a second CORESET pool index value; and updating the CORESET pool index value of a common CORESET based at least in part on the determination.

[0023] In some examples of the methods, devices, and non-transitory computer-readable media described herein, updating a CORESET pool index value may include operations, features, devices, or instructions for the following actions: updating the CORESET pool index value of a common CORESET to correspond to a new candidate beam CORESET pool index value.

[0024] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for: determining that a new candidate beam is associated with a first CORESET pool index value; and updating the quasi-co-location relationship for the CORESET indexed at 0 based at least in part on the determination, wherein the updated quasi-co-location relationship corresponds to the quasi-co-location configuration of the new candidate beam.

[0025] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a new candidate beam is associated with a first CORESET pool index value or a second CORESET pool index value; and updating a quasi-co-location relationship for each control resource associated with the first CORESET pool index value or the second CORESET pool index value based at least in part on the determination, wherein the updated quasi-co-location relationship corresponds to a quasi-co-location configuration of the new candidate beam.

[0026] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for updating an activated transmission configuration indicator state set for a data channel to a transmission configuration indicator state of a new candidate beam.

[0027] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a first CORESET pool index value is associated with a physical cell identifier associated with a PCell, and a second CORESET pool index value is associated with a physical cell identifier configured by a radio resource control.

[0028] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the resources include a first set of candidate beam detection resources associated with a physical cell identifier and a second set of candidate beam detection resources associated with a physical cell identifier configured by radio resource control.

[0029] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the new candidate beam is associated with a synchronization signal block that includes an index of a second set of synchronization signal blocks.

[0030] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying a first random access resource set associated with a physical cell identifier and a second random access resource set associated with a physical cell identifier configured by radio resource control, wherein an access message is transmitted on the first random access resource set or the second random access resource set.

[0031] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a beam failure on an active beam of a PCell is associated with a first CORESET pool index value, wherein the BFR procedure includes a PCell BFR procedure.

[0032] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a beam failure on an active beam of a PCell is associated with a second CORESET pool index value, wherein the BFR procedure includes a secondary cell BFR procedure.

[0033] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a secondary cell BFR procedure may include operations, features, apparatus, or instructions for: transmitting a link recovery request message in an uplink control channel; receiving a grant for scheduling uplink transmission of a UE based at least in part on the link recovery request message; and transmitting an uplink transmission including a media access control (MAC) control element (CE) indicating a second CORESET pool index value of the PCell.

[0034] A method for wireless communication at a base station is described. The method may include: transmitting to a UE a configuration of a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmitting an indication of a set of candidate beams that can be used for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value; and receiving an access message indicating a new candidate beam based at least in part on the UE detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0035] 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. The instructions are executable by the processor to cause the processor to: transmit to a UE a configuration of a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmit an indication of a set of candidate beams that can be used for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value; and receive an access message indicating a new candidate beam based at least in part on the UE detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0036] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: transmitting to a UE a configuration of a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmitting an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value; and receiving an access message indicating a new candidate beam based at least in part on the UE detecting a beam failure on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0037] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: transmit to a UE a configuration of a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmit an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value; and receive an access message indicating a new candidate beam based at least in part on the UE detecting a beam failure on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0038] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: identifying a first random access resource subset associated with a first candidate beam detection resource set corresponding to a first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource set corresponding to a second candidate beam subset, wherein an access message is received at least in part based on the first random access resource set or the second random access resource set.

[0039] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a new candidate beam is associated with a first candidate beam subset, wherein an access message is received on a random access resource corresponding to the new candidate beam selected from a first random access resource set.

[0040] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for transmitting an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value.

[0041] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a new candidate beam is associated with a first candidate beam subset, wherein an access message is received on a random access resource corresponding to the new candidate beam selected from a first random access resource set.

[0042] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the access message indicates a first CORESET pool index value or a second CORESET pool index.

[0043] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: receiving an access message using a first random access resource set associated with a first CORESET pool index value or a second random access resource set associated with a second CORESET pool index value, wherein the access message indicates that a beam failure has been detected on the PCell.

[0044] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: transmitting an access response message on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value.

[0045] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatuses, or instructions for: determining that a new candidate beam is associated with a first candidate beam subset; and transmitting an access response message on a first recovery search space.

[0046] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: transmitting a control channel signal in a first recovery search space; and determining that the BFR procedure is complete based at least in part on transmitting the control channel signal in the first recovery search space.

[0047] Some examples of the methods, devices, and non-transitory computer-readable media described herein may further include operations, features, devices, or instructions for the following actions: transmitting an access response message on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value, the first recovery search space and the second recovery search space being associated with a common CORESET.

[0048] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a new candidate beam is associated with a first candidate beam subset, wherein the access response message is transmitted in a first recovery search space.

[0049] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for: transmitting a control channel signal in a first recovery search space; and determining that the BFR procedure is complete based at least in part on transmitting the control channel signal in the first recovery search space.

[0050] In some examples of the methods, devices, and non-transitory computer-readable media described herein, associating the new candidate beam with the first CORESET pool index value or the second CORESET pool index value may include updating the CORESET pool index value of the common CORESET based at least in part on the access message.

[0051] In some examples of the methods, devices, and non-transitory computer-readable media described herein, updating a CORESET pool index value may include operations, features, devices, or instructions for the following actions: updating the CORESET pool index value of a common CORESET to correspond to a new candidate beam CORESET pool index value.

[0052] In some examples of the methods, devices, and non-transitory computer-readable media described herein, associating a new candidate beam with a first CORESET pool index value may include operations, features, devices, or instructions for: updating a quasi-co-location relationship for a CORESET indexed at 0 based at least in part on an access message, wherein the updated quasi-co-location relationship corresponds to a quasi-co-location configuration of the new candidate beam.

[0053] In some examples of the methods, devices, and non-transitory computer-readable media described herein, associating a new candidate beam with a first CORESET pool index value or a second CORESET pool index value may include operations, features, devices, or instructions for the following actions: updating a quasi-co-location relationship for each control resource associated with the first CORESET pool index value or the second CORESET pool index value based at least in part on an access message, wherein the updated quasi-co-location relationship corresponds to a quasi-co-location configuration of the new candidate beam.

[0054] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for updating an activated transmission configuration indicator state set for a data channel to a transmission configuration indicator state of a new candidate beam.

[0055] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a first CORESET pool index value is associated with a physical cell identifier associated with a PCell, and a second CORESET pool index value is associated with a physical cell identifier configured by a radio resource control.

[0056] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the resources include a first set of candidate beam detection resources associated with a physical cell identifier and a second set of candidate beam detection resources associated with a physical cell identifier configured by radio resource control.

[0057] In some examples of the methods, devices, and non-transitory computer-readable media described herein, the new candidate beam is associated with a synchronization signal block that includes an index of a second set of synchronization signal blocks.

[0058] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for configuring a first random access resource set associated with a physical cell identifier and a second random access resource set associated with a physical cell identifier configured by radio resource control for a UE, wherein an access message is received on the first random access resource set or the second random access resource set.

[0059] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a beam failure on an active beam of a PCell is associated with a first CORESET pool index value, wherein the BFR procedure includes a PCell BFR procedure.

[0060] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: determining that a beam failure on an active beam of a PCell is associated with a second CORESET pool index value, wherein the BFR procedure includes a secondary cell BFR procedure.

[0061] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a secondary cell BFR procedure may include operations, features, apparatus, or instructions for: receiving a link recovery request message in an uplink control channel; transmitting a grant for scheduling uplink transmission of a UE based at least in part on the link recovery request message; and receiving an uplink transmission including a MAC CE indicating a second CORESET pool index value for the PCell. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 An example of a system for wireless communication that supports beam failure (BFR) recovery for multiple transmit / receive points (TRPs) in a primary cell (PCell) in accordance with aspects of the present disclosure is illustrated.

[0064] Figure 2 An example of a wireless communication system supporting BFR for multiple TRPs in a PCell according to various aspects of the present disclosure is illustrated.

[0065] Figure 3 An example of a process for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is illustrated.

[0066] Figure 4 An example of a process for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is illustrated.

[0067] Figure 5 and 6 A block diagram of a device supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown.

[0068] Figure 7 A block diagram of a communication manager supporting BFR for multiple TRPs in a PCell is shown in accordance with various aspects of the present disclosure.

[0069] Figure 8 A diagram of a system including a device supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown.

[0070] Fig. 9 and 10 A block diagram of a device supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown.

[0071] Fig.11 A block diagram of a communication manager supporting BFR for multiple TRPs in a PCell is shown in accordance with various aspects of the present disclosure.

[0072] Fig.12A diagram of a system including a device supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown.

[0073] Figures 13 to 17 A flow chart illustrating a method of supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown.

[0074] Detailed Description

[0075] Wireless communication systems may operate in the millimeter wave (mmW) frequency range (e.g., 28 GHz, 40 GHz, 60 GHz, etc.). Wireless communication at these frequencies may be associated with increased signal attenuation (e.g., path loss), which may be affected by various factors, such as temperature, atmospheric pressure, diffraction, etc. As a result, signal processing techniques (such as beamforming) may be used to coherently combine energy and overcome path losses at these frequencies. Due to the increased amount of path loss in mmW communication systems, transmissions from base stations and / or user equipment (UE) may be beamformed. In addition, a receiving device may use beamforming techniques to configure antenna(s) and / or antenna array(s) so that transmissions are received in a directional manner.

[0076] Such beamforming techniques can be implemented in a multi-cell scenario, where a primary cell (PCell) (which may also include primary / secondary cells (P / SCells)) is associated with multiple transmit / receive points (TRPs). The PCell can configure carriers associated with TRPs for the UE, which transmit beamformed transmissions to the UE on the carrier. However, channel conditions may change (e.g., due to interference, UE mobility, etc.) so that the UE may experience a beam failure on a carrier. In some wireless communication systems, the UE will wait for a carrier to fail on each TRP before initiating a beam failure recovery (BFR) procedure to identify a new active beam to be used for communication. However, this approach is inefficient and may result in a complete loss of communication between the UE and the PCell. That is, it is inefficient for the UE to wait until a beam fails on each TRP before declaring a BFR for the carrier. In addition, if a beam fails on each TRP, this may result in a complete link failure between the UE and the PCell.

[0077] Various aspects of the present disclosure are initially described in the context of a wireless communication system. The described techniques relate to improved methods, systems, devices, and apparatuses that support beam failure recovery (BFR) for multiple transmission / reception points (TRPs) in a primary cell (PCell) (which may be an example of a PCell and / or a primary / secondary cell (P / SCell)). In general, the described techniques provide a per-TRP BFR procedure at a PCell configured with a component carrier (CC) associated with two control resource sets (CORESET) pool index values ​​(CORESETPoolIndex). Different CORESET pool index values ​​are configured for user equipment (UE), wherein each CORESET pool index value is associated with a corresponding different TRP of the PCell. The PCell (e.g., a base station) may configure the UE with an indication of a candidate beam set that may be used for the BFR procedure, wherein the candidate beam set includes a first candidate beam subset for a first CORESET pool index value / TRP and a second candidate beam subset for a second CORESET pool index value / TRP. The UE may identify or otherwise detect a beam failure on a CC on a currently active beam of a PCell and select a new candidate beam from a candidate beam set. For example, the UE may detect a beam failure based on a reference signal from a TRP (e.g., a beam failure detection (BFD) reference signal) failing to meet a threshold performance metric. The reference signal may be associated with a first CORESET pool index value or a second CORESET pool index value. Accordingly, the UE may know that the beam failure is associated with the corresponding first TRP or second TRP, and select a new candidate beam from the corresponding first candidate beam subset or second candidate beam subset, respectively. For example, the UE may measure the candidate beams in the associated candidate beam subset to identify the best performance candidate beam. The UE may select the best performance candidate beam (or N best performance candidate beams) as a new candidate beam. The UE may transmit an access message (e.g., such as a random access channel (RACH) message, a link recovery request (LRR), etc.) indicating the new candidate beam. The BFR procedure may establish the new candidate beam as a new active beam with the corresponding TRP.

[0078] Various aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow charts related to BFR for multiple TRPs in PCell.

[0079] Figure 1An example of a wireless communication system 100 supporting BFR for multiple TRPs in a PCell according to various aspects of the present disclosure is illustrated. 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 communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0080] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0081] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0082] Each base station 105 may communicate with the core network 130, or communicate with each other, or both. For example, the 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). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links.

[0083] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0084] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as electrical appliances or vehicles, meters, etc.

[0085] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0086] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates 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 for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The 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.

[0087] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A 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. A carrier may operate in a standalone mode in which initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode in which a connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0088] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in an FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in a TDD mode).

[0089] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. Devices (e.g., base stations 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configurable to support communications on one of the carrier bandwidths in 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 communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of the carrier bandwidth.

[0090] 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 spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and the 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 received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity of communication with UE 115.

[0091] One or more parameter designs for a carrier may be supported, where the parameter designs may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different parameter designs. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to the one or more active BWPs.

[0092] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N f The maximum supported discrete Fourier transform (DFT) size may be indicated. Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0093] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of 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 a number of code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0094] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0095] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., CORESET) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESET) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0096] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with a base station 105 (e.g., on a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The range of such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area depending on various factors (such as the capabilities of the base station 105). For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0097] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have service subscriptions with a network provider that supports the macro cell. A small cell may be associated with a lower power base station 105 (compared to a macro cell), and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell 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), UEs 115 associated with users in a home or office). A base station 105 may support one or more cells and may also support communications on one or more cells using one or more component carriers.

[0098] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0099] In some examples, base stations 105 may be mobile and, therefore, provide communication coverage for 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. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0100] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous or asynchronous operation.

[0101] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0102] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but not simultaneous transmission and reception). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0103] The wireless communication system 100 may be configured to support ultra-reliable communication or low latency communication or various combinations thereof. For example, the 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 critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services (such as mission-critical push-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 commercial applications. The terms ultra-reliable, low latency, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0104] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0105] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these communications. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units), or with the network, or both via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communications.

[0106] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), and the EPC or 5GC may include at least one control plane entity (e.g., a mobility management entity (MME), an 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), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0107] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). 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 heads and ANCs) or merged into a single network device (e.g., base station 105).

[0108] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0109] The wireless communication system 100 may also operate in a super high frequency (SHF) zone using a frequency band from 3 GHz to 30 GHz (also known as a centimeter band) or in an extremely high frequency (EHF) zone of a spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antenna of the corresponding device may be smaller and more closely spaced than the UHF antenna. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency zones, and the use of frequency bands specified across these frequency zones may vary by country or regulatory agency.

[0110] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0111] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having antenna ports of several rows and columns that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the 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.

[0112] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. 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 for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0113] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0114] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by the base station 105 in different directions. For example, the base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or a receiving device (such as the UE 115)) to identify a beam direction used by the base station 105 for later transmission or reception.

[0115] Some signals, such as data signals associated with a particular recipient device, may be transmitted by base station 105 in a single beam direction, e.g., a direction associated with a recipient device, such as UE 115. In some examples, a beam direction associated with transmissions along a single beam direction may be determined based on 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 signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0116] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit a reference signal that may be precoded or unprecoded (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)). The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a 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 a beam direction for subsequent transmission or reception by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0117] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, processing received signals according to different antenna subarrays, receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different reception configurations or reception directions. In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). The single reception configuration may be aligned on a beam direction determined based on listening according to different reception configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0118] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection that supports radio bearers of user plane data between UE 115 and base station 105 or core network 130. In the physical layer, transport channels may be mapped to physical channels.

[0119] UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve the throughput of the MAC layer in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0120] The UE 115 may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The UE 115 may receive an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams including a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value. The UE 115 may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value. The UE 115 may select a new candidate beam from the set of candidate beams based at least in part on monitoring resources associated with the first CORESET pool index value or the second CORESET pool index value. The UE 115 may transmit an access message indicating the new candidate beam during the BFR procedure.

[0121] The base station 105 may transmit, to the UE 115 (e.g., when configured or otherwise acting as a PCell), a configuration of a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The base station 105 may transmit an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first CORESET pool index value and a second subset of candidate beams associated with the second CORESET pool index value. The base station 105 may receive an access message indicating a new candidate beam based at least in part on the UE 115 detecting a beam failure on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0122] Figure 2 An example of a wireless communication system 200 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is illustrated. 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, a PCell 210, and several TRPs 215 associated with the PCell 210, which may be examples of corresponding devices described herein. In this example, the TRP 215 may provide a multi-TRP PCell, 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.

[0123] In some cases, multi-TRP transmissions may be configured based on multiple downlink control information (DCI) communications, where a first DCI (e.g., transmitted in PDCCH1 from a first TRP 215-a) schedules a downlink shared channel transmission (e.g., PDSCH1 transmitted from a first TRP 215-a via a first beam 220-a), and a second DCI (e.g., transmitted in PDCCH2 from a second TRP 215-b) schedules a second downlink shared channel transmission (e.g., PDSCH2 transmitted from a second TRP 215-b via a second beam 220-b). In some cases, TRP 215 differentiation at the UE 205 may be based on a value of a CORESET pool index (e.g., CORESETPoolIndex), where each CORESET (e.g., up to five CORESETs) may be configured with a value of the CORESET pool index. In some cases, the value of the CORESET pool index may be zero (0) or one (1), which groups the CORESETs into two groups, which may correspond to different TRPs 215. Only some CCs may be configured with two CORESET pool index values, while other CCs may not be configured with two CORESET pool index values, and thus BFD / BFR on a per-TRP 215 basis may be provided to CCs configured with two CORESET pool index values.

[0124] In some cases, the UE 205 may be configured to provide per-TRP 215 BFR, which enables separate BFD and separate CBD for beams corresponding to TRP 215 in a CC configured with two CORESET pool index values. In the absence of per-TRP 215 BFR, BFD and BCD may not be triggered until all beams in the CC become weak. With per-TRP 215 BFR, when the beam for a given TRP becomes weak, a beam recovery procedure may be performed and the best beam corresponding to that TRP 215 may be identified without having to wait for beams of other TRPs 215 to also become weak, and thus reliability and communication efficiency may be improved. Figure 2In the non-limiting example illustrated in , the PCell 210 may be configured with two CORESET pool index values, one of which is associated with a first TRP 215-a and a second value is associated with a second TRP 215-b. In this case, each TRP 215 may transmit one or more BFD reference signals that may be monitored by the UE 205. In this example, the UE 205 may determine that a first beam 220-a of a first CORESET pool index value (e.g., CORESETPoolIndex=0) has a channel metric (e.g., reference signal received power, RSRP) below a threshold (e.g., when the radio link quality is worse than a threshold Qout for all reference signals in the BFD resources associated with the first CORESET pool index value).

[0125] Thus, the UE 205 may be configured for a carrier (e.g., an individual CC, a bandwidth part (BWP), etc.) associated with the PCell 210 configured with a first CORESET pool index value (e.g., CORESETPoolIndex=0) and a second CORESET pool index value (e.g., CORESETPoolIndex=1). The first CORESET pool index value may be associated with a first TRP 215-a of the PCell 210, and the second CORESET pool index value may be associated with a second TRP 215-b of the PCell 210. Each TRP 215 may transmit one or more BFD reference signals associated with its corresponding CORESET pool index value. This may include two BFD reference signal sets (e.g., failureDetectionResources) being configured, where each set corresponds to a different CORESET pool index value. In another example, this may include each reference signal (e.g., each resource within the failureDetectionResources) being configured with a CORESET pool index value. If a resource is not configured with a CORESET pool index value, it can be considered to be associated with a CORESET pool index value of 0 (e.g., the first CORESET pool index value). Additionally, a resource may be configured with two CORESET pool index values. When reference signals (e.g., failureDetectionResources) are not configured, the reference signal set indicated in the active transmission configuration indicator (TCI) state of the CORESET configured with a CORESET pool index value = 0 / 1 (e.g., any CORESET pool index value) can determine the first / second resource set, respectively. When the radio link quality is worse than Qout for all reference signals and BFD resources associated with a CORESET pool index value, BFD for that CORESET pool index value may be declared.

[0126] The UE 205 may also receive or otherwise identify an indication of a set of candidate beams that may be used for the BFR procedure. The set of candidate beams may include a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. In one example, this may include two candidate beam lists (e.g., candidateBeamRSList) being configured, each list corresponding to a CORESET pool index value. That is, the UE 205 may be separately configured with a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value.

[0127] In another example, each reference signal of candidateBeamRSList may be configured with a CORESET pool index value. If a reference signal is not configured with a CORESET pool index value, it may be assumed that the resource is associated with a CORESET pool index value of 0. In some examples, a reference signal may be configured with two CORESET pool index values ​​(e.g., the resource may be considered for two TRPs 215).

[0128] The UE 205 may detect or otherwise determine that a beam failure has occurred on a carrier of an active beam (e.g., the first beam 220-a or the second beam 220-b) of the PCell 210 (e.g., the RSRP on the active beam is less than Q_out). The UE 205 may select a new candidate beam from the set of candidate beams based on the detected beam failure, based on monitoring resources associated with the first CORESET pool index value or the second CORESET pool index value (e.g., CBD resources). When BFD is declared for a CORESET pool index value, a new candidate beam (e.g., q_new) may be identified from candidate reference signals associated with the same CORESET pool index value. Thus, the UE 205 may select a new candidate beam from the set of candidate beams based on monitoring resources associated with the first CORESET pool index value (when the first beam 220-a experiences a beam failure) or the second CORESET pool index value (when the second beam 220-b experiences a beam failure) (e.g., CBD resources). The UE 205 may transmit or otherwise communicate an access message indicating a new candidate beam to the PCell 210 during a BFR procedure (e.g., via the first TRP 215-a (if conditions on the carrier permit) and / or via the second TRP 215-b).

[0129] In some aspects, the UE 205 may receive or otherwise identify a first random access resource subset (e.g., RACH resource / random access preamble index) associated with a first candidate beam detection (e.g., CBD) resource subset corresponding to a first candidate beam subset, and a second random access resource subset associated with a second CBD resource subset corresponding to a second candidate beam subset. That is, the dedicated RACH resource for BFR may also be associated with a CORESET pool index value. In some examples, this may include an implicit indication based on an association of the RACH resource / random access preamble index with a candidate beam reference signal (e.g., because each candidate beam reference signal is already associated with a CORESET pool index value). The network (e.g., PCell 210) may determine which TRP / CORESET pool index value has experienced a beam failure (and a corresponding new beam q_new) in the PCell 210 based on the resource / random access preamble index of the received RACH (e.g., based on the random access resource used to transmit the access message).

[0130] In some examples, this may include two lists of RACH resources / random access preamble indices being configured, where each list of RACH resources / random access preamble indices is associated with one of the CORESET pool index values. For example, UE 205 may receive an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value. Thus, UE 205 may determine that the new candidate beam is associated with the first candidate beam subset, and select a random access resource corresponding to the new candidate beam from the first random access resource set to transmit the access message. In another example, UE 205 may determine that the new candidate beam is associated with the second candidate beam subset, and select a random access resource corresponding to the new candidate beam from the second random access resource set to transmit the access message.

[0131] The UE 205 may transmit or otherwise communicate an access message utilizing a corresponding RACH resource / random access preamble to carry or otherwise communicate an indication of a CORESET pool index value associated with the beam failure. The UE 205 may reset an active beam associated with the TRP 215 that experienced the beam failure.

[0132] In some aspects, this may include updating various quasi-co-location (QCL) relationships. For example, the UE 205 may determine that the new candidate beam is associated with a first CORESET pool index value, and therefore update the QCL relationship for the CORESET indexed at 0 (e.g., a CORESET for a common search space procedure). The updated QCL relationship may correspond to the QCL configuration of the new candidate beam. That is, when the new candidate beam (e.g., q_new) corresponds to the CORESET pool index value 0, the QCL assumption for CORESET 0 may be updated (e.g., after 28 symbols after the last symbol carrying the PDCCH). Thus, the updated QCL configuration may occur after a threshold time period. When the new candidate beam (e.g., q_new) corresponds to the CORESET pool index value 1 (e.g., a second CORESET pool index value), the QCL assumption for CORESET 0 (e.g., QCL configuration) may not be updated. In some aspects, this may be based on the fact that CORESET 0 is generally associated with the CORESET pool index value 0.

[0133] In some aspects, this may include the UE 205 determining that the new candidate beam is associated with the first or second CORESET pool index value. Thus, the UE 205 may update the QCL relationship for each CORESET associated with the first CORESET pool index value or the second CORESET pool index value, respectively. Again, the updated QCL relationship may correspond to the QCL configuration of the new candidate beam. That is, when a new candidate beam (e.g., q_new) corresponds to a CORESET pool index value, the QCL assumptions for all CORESETs associated with the same CORESET pool index value may be reset to the new candidate beam (e.g., 28 symbols after the last symbol carrying the PDCCH). The activated TCI state set for the PDSCH corresponding to the same CORESET pool index value may be reset to the new candidate beam. Thus, the UE 205 may update the activated TCI state set for the data channel to the TCI state of the new candidate beam.

[0134] In some aspects, this may include the UE 205 determining that the new candidate beam is associated with the first or second CORESET pool index value. The UE 205 may update the CORESET pool index value of the common CORESET accordingly. For example, the UE 205 may update the CORESET pool index value of the common CORESET to correspond to the CORESET pool index value of the new candidate beam. That is, when the new candidate beam corresponds to the first or second CORESET pool index value and one CORESET (e.g., the common CORESET) is configured for BFR, the CORESET pool index value associated with the recovery search space ID (e.g., recoverySearchSpaceId) of the CORESET may be reset to the CORESET pool index value corresponding to the new candidate beam.

[0135] In some aspects, a first CORESET pool index value may be associated with a PCI of the PCell 210, and a second CORESET pool index value may be associated with an RRC-configured PCI. That is, a CORESET pool index value of 0 may be associated with a PCI of a serving cell (e.g., a PCI determined based on a primary synchronization signal / secondary synchronization signal (PSS) / (SSS) and an initial access procedure), while a CORESET pool index value of 1 may be associated with a different PCI configured by the RRC for the UE 205. In some examples, a set of secondary synchronization signal blocks (SSBs) associated with an RRC-configured PCI may be configured for the UE 205, e.g., a new candidate beam may be associated with an SSB having an index of a second SSB set. Thus, in some examples, resources used to transmit an access message may correspond to a first CBD resource set associated with a PCI of the PCell 210 and a second CBD resource set associated with an RRC-configured PCI.

[0136] That is, two lists of reference signals (e.g., BFD RS) may be configured for candidate beam reference signals corresponding to two PCIs (associated with two CORESET pool index values). Thus, UE 205 may identify a first random access resource set associated with the PCI of PCell 210 and a second random access resource set associated with the RRC-configured PCI. If a candidate beam reference signal (e.g., for CBD) is an SSB and is associated with a second CORESET pool index value (e.g., CORESETPoolIndex=1), the corresponding SSB index may refer to an index from the RRC-configured second SSB set (e.g., and therefore corresponding to the RRC-configured PCI). In some aspects, when a candidate SSB belongs to the second SSB set, the candidate SSB may be configured with a set of random access opportunities by the RRC. Those random access opportunities may be different from the random access opportunities configured in the remaining minimum system information (RMSI) of the PCI of the serving cell (e.g., the PCI of PCell 210). In some aspects, separate RACH parameters may be configured corresponding to two candidate reference signal sets associated with two CORESET pool index values / two PCIs.

[0137] In some aspects, the UE 205 may treat the second CORESET pool index value (e.g., CORESETPoolIndex=1) as the SCell for BFR procedures. That is, the UE 205 may determine that the beam failure on the active beam of the PCell 210 is associated with the first CORESET pool index value (e.g., CORESETPoolIndex=0 and associated with the first TRP 215-a), and thus perform the PCell BFR procedures. When BFD is detected for the first CORESET pool index value (e.g., CORESETPoolIndex=0), procedures corresponding to the PCell BFR procedures may be followed (e.g., RACH transmission, PDCCH reception in the recovery search ID, etc., as generally described with reference to process 300). However, the UE 205 may determine that the beam failure on the active beam of the PCell 210 is associated with the second CORESET pool index value (e.g., CORESETPoolIndex=1 and associated with the second TRP 215-b), and thus perform the SCell BFR procedures. If BFD is detected for a second CORESET pool index value (e.g., CORESETPoolIndex=1) for PCell 210, procedures corresponding to SCell BFR procedures may be followed. For example, a link recovery request (LRR) message may be transmitted in the configured PUCCH resources, and in response, a grant for scheduling uplink transmissions for UE 205 may be received. In this case, the MAC CE beam failure response may convey an indication of an additional Ci field associated with CORESET pool index value 1 and a corresponding AC / Candidate Reference Signal ID field (e.g., when Ci=1) in PCell 210. The AC field may correspond to a Candidate Reference Signal ID field. General reference process 400 describes an example SCell BFR procedure that may be modified according to the described techniques.

[0138] refer to Figure 3 The process of 300 and Figure 4 Additional examples of beam failure declaration, candidate beam detection, beam recovery, etc. are discussed in process 400. Figure 3 The process 300 generally illustrates the PCell BFR protocol, Figure 4 Process 400 generally illustrates the SCell BFR procedure.

[0139] Figure 3An example of a process 300 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is illustrated. In some examples, the process 300 can implement aspects of the wireless communication systems 100 and / or 200. Aspects of the process 300 can be implemented by a PCell 305 and / or a UE 310, which can be examples of corresponding devices described herein. In some aspects, the PCell 305 can be associated with multiple TRPs.

[0140] In a broad sense, the PCell 305 may configure the UE 310 with a carrier that is configured with a first CORESET pool index value (e.g., CORESETPoolIndex=0) and a second CORESET pool index value (e.g., CORESETPoolIndex=1) or otherwise associated with the first CORESET pool index value and the second CORESET pool index value. The PCell 305 may also configure the UE 310 with a candidate beam set that can be used for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value.

[0141] At 315, the Pcell 305 may transmit (and the UE 310 may receive) configuration regarding BFD reference signals (e.g., BFD-RS(es). That is, BFD may be based on periodic CSI-RS resources configured by RRC (e.g., RRC parameter failureDetectionResources). Up to two single-port reference signals may be configured. If not configured, the reference signal set indicated by the active TCI state of the CORESET monitored by the UE 310 may be used. For the active TCI state of the CORESET, there may be 2 reference signal indices, for example, where QCL type D may be used.

[0142] At 320, the UE 310 may determine or otherwise declare a beam failure on an active beam associated with the first CORESET pool index value or the second CORESET pool index value of the PCell 305. In some aspects, the physical layer of the UE 310 may evaluate the radio link quality based on the BFD set for a threshold (e.g., q_out). If the radio link quality is worse than q_out for all reference signals in the BFD resource set, the physical layer may provide an indication to higher layers (e.g., an indication that a beam failure has been detected).

[0143] At 325, the UE 310 may select a new candidate beam (e.g., perform CBD) based on monitoring resources associated with the first CORESET pool index value or the second CORESET pool index value. In some aspects, the CBD may be based on periodic CSI-RS / SSB configured by RRC (e.g., RRC parameter candidateBeamRSList). In some examples, up to 16 resources may be configured with corresponding random access preamble indexes (e.g., for RACH). Upon request from a higher layer, the UE 310 may provide a reference signal index and RSRP from a list having an RSRP value equal to or greater than q_in (e.g., a configurable threshold). The UE 305 may initiate a RACH procedure (e.g., a contention-free RACH procedure) based on a random access resource (e.g., a random access preamble index) associated with a selected reference signal index (e.g., RS index q_new) having an RSRP value above a threshold. Accordingly and at 330, the UE 310 may transmit (and the PCell 305 may receive) a RACH message, e.g., an access message.

[0144] At 335, Pcell 305 may transmit (and UE 310 may receive) a BFR response. That is, UE 310 may monitor the PDCCH in the search space set provided by the parameter recoverySearchSpaceId for detecting a DCI format CRC-scrambled by C-RNTI or MCS-C-RNTI starting from slot n+4. This may correspond to a random access response (e.g., in this case, a BFR response). If UE 310 receives a PDCCH within the window, the BFR procedure may be considered complete. In some aspects, the CORESET associated with the SSS provided by recoverySearchSpaceID may not be used for any other SSS.

[0145] In general, various QCL assumptions may be employed after RACH. For PDCCH monitoring and SSS provided by recoverySearchSpaceID and for corresponding PDSCH reception, the UE 310 may assume the same QCL parameters as those associated with the reference signal index q_new (e.g., QCL parameters of the new candidate beam) until the UE 310 receives, for example, through a higher layer, an activation for the TCI state or any of the parameters TCI-StatesPDCCH-ToAddList and / or TCI-StatesPDCCH-ToReleaseList. In some cases, after UE 310 detects the 28th codeword from the last codeword of the first PDCCH reception and SSS provided by recoverySearchSpaceID in a DCI format with a CRC scrambled by C-RNTI or MCS-C-RNTI, UE 310 may assume the same QCL parameters as those associated with the reference signal index q_new for PDCCH monitoring in a CORESET with a pool index value of 0.

[0146] However, according to aspects of the described techniques, the UE 310 may monitor for an access response message (e.g., a BFR response) on a first recovery search configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value. That is, two different CORESETs may be associated with two different recovery search spaces (e.g., two recoverySearchSpaceIDs may be configured). The two CORESETs may be configured with different CORESET pool index values. The recoverySearchSpaceID may be associated with the CORESET pool index value through the corresponding CORESET. Therefore, the UE 310 may determine that the new candidate beam is associated with the first candidate beam subset and monitor for an access response message (e.g., a BFR response) on the first recovery search space. Similarly, the UE 310 may determine that the new candidate beam is associated with the second candidate beam subset and monitor for an access response message (e.g., a BFR response) on the second recovery search space. UE 310 may receive a control channel signal (eg, a PDCCH, which may include an access response message, or in this example, a BFR response) and a corresponding recovery search space, and determine that the BFR procedure is complete based on receiving the control channel signal in the corresponding recovery search space.

[0147] In some aspects, only one CORESET may be used for BFR purposes. For example, the UE 310 may monitor for an access response message (e.g., a BFR response) on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value. In this example, the first and second recovery search spaces may be associated with a common CORESET (e.g., a single CORESET for BFR purposes). In one aspect, this may include two recoverySearchSpaceIDs being configured, both of which are associated with the same CORESET. The first recovery search space (e.g., the first recoverySearchSpaceId) may be associated with a first CORESET pool index value (e.g., CORESETPoolIndex=0), and the second recovery search space (e.g., the second recoverySearchSpaceId) may be associated with a second CORESET pool index value (e.g., CORESETPoolIndex=1). This association between the second recovery search space and the second CORESET pool index value may be a direct association (e.g., not through a CORESET).

[0148] If the RACH transmission at 330 in slot n is associated with a new candidate beam associated with a CORESET pool index value (e.g., q_new), the UE 310 may monitor the PDCCH in the search space set provided by the recoverySearchSpaceID associated with the same CORESET pool index value for detecting a DCI format with a CRC scrambled by C-RNTI or MCS-C-RNTI starting from slot n+4. When the UE 310 receives a PDCCH (e.g., a BFR response) in the corresponding recovery search space, the BFR procedure for the CORESET pool index value may be completed. The PDCCH and corresponding PDSCH reception may use the same beam as that used by q_new (e.g., a new candidate beam).

[0149] Thus, the UE 310 may determine that the new candidate beam is associated with the first candidate beam subset and monitor the first recovery search space for an access response message (e.g., a BFR response). Similarly, the UE 310 may determine that the new candidate beam is associated with the second candidate beam subset and monitor the second recovery search space for an access response message (e.g., a BFR response). The UE 310 may receive a control channel signal (e.g., a PDCCH, which may be an example of an access response message, or a BFR response in this example) in the corresponding recovery search space and determine that the BFR procedure is complete based on receiving the control channel signal in the corresponding recovery search space.

[0150] Figure 4 An example of a process 400 for supporting BFR for multiple TRPs in a PCell in accordance with various aspects of the present disclosure is illustrated. In some examples, the process 400 may implement aspects of the wireless communication system 100 and / or 200 and / or the process 300. Various aspects of the process 400 may be implemented by a PCell 405, a UE 410, and / or a SCell 415, which may be examples of corresponding devices described herein. In some aspects, the PCell 405 and / or the SCell 415 may each be associated with multiple TRPs, respectively. Broadly, the process 400 illustrates an example of a SCell BFR procedure that may be modified in at least some aspects according to the described techniques when a carrier on the PCell 405 experiences a beam failure.

[0151] In a broad sense, the PCell 405 may configure the UE 410 with a carrier that is configured with a first CORESET pool index value (e.g., CORESETPoolIndex=0) and a second CORESET pool index value (e.g., CORESETPoolIndex=1) or otherwise associated with the first CORESET pool index value and the second CORESET pool index value. The PCell 405 may also configure the UE 410 with a candidate beam set that can be used for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value.

[0152] As discussed above, aspects of the described techniques may include using a SCell BFR procedure when a beam failure on an active beam of the PCell 405 is associated with a second CORESET pool index value (eg, CORESETPoolIndex=1). Process 400 illustrates one non-limiting example of such a BFR procedure.

[0153] At 420, the Scell ​​415 may transmit (and the UE 410 may receive) a configuration regarding a BFD reference signal. That is, the BFD may be based on periodic CSI-RS resources configured by RRC (e.g., RRC parameter failureDetectionResources). At 425, the UE 410 may determine or otherwise declare a beam failure on an active beam of the SCell 415 associated with the first CORESET pool index value or the second CORESET pool index value. Although the process 400 illustrates reference signal-based beam failure and SCell 415-based BFD, aspects of the described techniques may use the same process for BFD on the PCell 405. That is, although the process 400 illustrates the UE 410 detecting or otherwise declaring BFD on the SCell 415, it should be understood that according to the described techniques, the UE 410 may similarly detect or otherwise declare BFD on a carrier of the PCell 405.

[0154] At 430, the UE 410 may transmit (and the PCell 405 may receive) an LRR message. The LRR message may be transmitted on the PCell 405 (e.g., PUCCH-PCell and / or PUCCH-SCell) in which PUCCH BFR is configured. The LRR message may be similar to a scheduling request (SR) and use PUCCH format 0 or 1. The LRR message may be transmitted in an uplink control channel.

[0155] At 435, PCell 405 may transmit (and UE 410 may receive) an uplink grant. The uplink grant may include or use C-RNTI / MCS-C-RNTI and may be used as a response message to the LRR message. The uplink grant may schedule a PUSCH for UE 410 where a BFR MAC CE may be transmitted. If UE 410 has already configured an uplink grant, the LRR message at 430 and the uplink grant 435 may be skipped.

[0156] At 440, the UE 410 may perform CBD. That is, before sending a BFR response indicating a MAC CE, the UE 410 may identify the best new beam (e.g., select a new candidate beam) for the failed SCell 415 (or PCell 405 in this example). The CBD may be similar to the description provided in process 300. Up to 64 resources (e.g., candidateBeamRSSCellList or candidateBeamRSPCellList in this example) may be configured in the candidate beam set, and they may be transmitted on the failed SCell 415 (or PCell 405 in this example) or on another CC in the same frequency band. In some aspects, the BFR procedure illustrated in process 400 may not include a RACH process, and therefore, CBD resources may not be associated with RACH resources.

[0157] At 445, the UE 410 may transmit (and the PCell 405 may receive) a BFR MAC CE. In some aspects, the BFR MAC CE may carry or otherwise convey an indication of in which cell a beam failure has occurred (e.g., an SCell index or, in this example, a PCell index) and / or identify a potential new candidate beam. For example, the BFR MAC CE may include a first row of Ci indications (e.g., up to eight Ci indications), each of which is set to 1 to indicate that BFD has occurred in that CC. For each Ci indication set to 1, a subsequent row in the MAC CE may include an AC field set to 1 indicating that a candidate reference signal ID field is present. The remaining bits in the row may carry the candidate reference signal ID. The BFR MAC CE may be transmitted to the PCell 405 and / or the SCell 415 (e.g., may be transmitted to any cell, including the failed cell).

[0158] Thus, in some aspects, UE 410 may configure an access message (e.g., a BFR MAC CE) to indicate a CORESET pool index value associated with a detected beam failure. That is, the MAC CE may explicitly indicate a CORESET pool index value corresponding to BFD.

[0159] In some aspects, the UE 410 may configure an access message (e.g., a BFR MAC CE) to indicate that a beam failure is detected on the PCell 405. In this example, the UE 410 may transmit or otherwise communicate the access message using a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value. That is, the MAC CE may indicate only BFD for the PCell 405, and the RACH resource / random access preamble index may implicitly determine (e.g., indicate) the CORESET pool index value associated with the BFD (e.g., and the q_new / new candidate beam for that CORESET pool index value).

[0160] At 450, the Pcell 405 may transmit (and the UE 410 may receive) a BFR response. In some aspects, the BFR response to the MAC CE may be an uplink grant that schedules a new transmission for the same HARQ process as the PUSCH carrying the MAC-CE (e.g., with a switched new data indicator (NDI)). If new candidate beams are reported in the BFR MAC CE, all CORESET beams on the failed cell (e.g., SCell 415 or PCell 405 in this example) may be reset to the new candidate beams 28 symbols from the end of the BFR response (e.g., in the PDCCH). If the failed cell is a PUCCH-SCell, PUCCH-spatialRelationInfo may be configured. If LLRs are not transmitted on the failed cell, the PUCCH beams on the failed cell may be reset to the new candidate beams.

[0161] In some aspects, this may include the UE 410 monitoring an access response message (e.g., a BFR response) on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value. That is, two different CORESETs may be associated with two different recovery search spaces (e.g., two recoverySearchSpaceIDs may be configured). The two CORESETs may be configured with different CORESET pool index values. The recoverySearchSpaceID may be associated with the CORESET pool index value through the corresponding CORESET. Therefore, the UE 410 may determine that the new candidate beam is associated with the first candidate beam subset and monitor for an access response message (e.g., a BFR response) on the first recovery search space. Similarly, the UE 410 may determine that the new candidate beam is associated with the second candidate beam subset and monitor for an access response message (e.g., a BFR response) on the second recovery search space. UE 410 may receive a control channel signal (eg, an access response message or, in this example, a BFR response) in the corresponding recovery search space and determine that the BFR procedure is complete based on receiving the control channel signal in the corresponding recovery search space.

[0162] In some aspects, only one CORESET may be used for BFR purposes. For example, the UE 410 may monitor for an access response message (e.g., a BFR response) on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value. In this example, the first and second recovery search spaces may be associated with a common CORESET (e.g., a single CORESET for BFR purposes). In one aspect, this may include two recoverySearchSpaceIDs being configured, both of which are associated with the same CORESET. The first recovery search space (e.g., the first recoverySearchSpaceId) may be associated with a first CORESET pool index value (e.g., CORESETPoolIndex=0), and the second recovery search space (e.g., the second recoverySearchSpaceId) may be associated with a second CORESET pool index value (e.g., CORESETPoolIndex=1). This association between the second recovery search space and the second CORESET pool index value may be a direct association (e.g., not through a CORESET).

[0163] Figure 5A block diagram 500 of a device 505 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0164] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to BFR for multiple TRPs in a PCell, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 510 may utilize a single antenna or a collection of antennas.

[0165] The communication manager 515 may receive a configuration about a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receive an indication of a set of candidate beams available for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; select a new candidate beam from the set of candidate beams based on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; detect a beam failure on the carrier on an active beam associated with the first CORESET pool index value or the second CORESET pool index value of the PCell; and transmit an access message indicating the new candidate beam during the BFR procedure. The communication manager 515 may be an example of aspects of the communication manager 810 described herein.

[0166] The communication manager 515 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0167] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0168] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0169] Figure 6 A block diagram 600 of a device 605 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 635. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0170] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to BFR for multiple TRPs in a PCell, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 610 may utilize a single antenna or a collection of antennas.

[0171] The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a CC configuration manager 620, a candidate beam manager 625, and a BFR manager 630. The communication manager 615 may be an example of aspects of the communication manager 810 as described herein.

[0172] The CC configuration manager 620 may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value.

[0173] The candidate beam manager 625 may receive an indication of a set of candidate beams available for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value; and select a new candidate beam from the candidate beam set based on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0174] The BFR manager 630 may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; and transmit an access message indicating the new candidate beam during the BFR procedure.

[0175] The transmitter 635 can transmit signals generated by other components of the device 605. In some examples, the transmitter 635 can be co-located with the receiver 610 in a transceiver module. For example, the transmitter 635 can be a reference Figure 8 Examples of aspects of the described transceiver 820. The transmitter 635 may utilize a single antenna or a collection of antennas.

[0176] Figure 7 A block diagram 700 of a communication manager 705 supporting BFR for multiple TRPs in a PCell is shown in accordance with aspects of the present disclosure. The communication manager 705 may be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 may include a CC configuration manager 710, a candidate beam manager 715, a BFR manager 720, an access resource manager 725, a BFR reporting manager 730, a PCell BFR reporting manager 735, a BFR response manager 740, a QCL manager 745, and a BFR procedure manager 750. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0177] The CC configuration manager 710 may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. In some examples, the CC configuration manager 710 may identify a first random access resource set associated with a physical cell identifier and a second random access resource set associated with a physical cell identifier configured by radio resource control, wherein the access message is transmitted on the first random access resource set or the second random access resource set.

[0178] In some cases, the first CORESET pool index value is associated with a physical cell identifier associated with the PCell, and the second CORESET pool index value is associated with a physical cell identifier configured by radio resource control. In some cases, the resources include a first candidate beam detection resource set associated with the physical cell identifier and a second candidate beam detection resource set associated with the physical cell identifier configured by radio resource control. In some cases, the new candidate beam is associated with a synchronization signal block that includes an index of a second synchronization signal block set.

[0179] The candidate beam manager 715 may receive an indication of a set of candidate beams available for a BFR procedure, the set of candidate beams comprising a first subset of candidate beams associated with a first CORESET pool index value and a second subset of candidate beams associated with a second CORESET pool index value. In some examples, the candidate beam manager 715 may select a new candidate beam from the set of candidate beams based on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0180] The BFR manager 720 may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value. In some examples, the BFR manager 720 may transmit an access message indicating the new candidate beam during the BFR procedure.

[0181] The access resource manager 725 may identify a first random access resource subset associated with a first candidate beam detection resource subset corresponding to a first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource subset corresponding to a second candidate beam subset, wherein the access message is transmitted based on the first random access resource set or the second random access resource set.

[0182] In some examples, the access resource manager 725 may receive an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value. In some examples, the access resource manager 725 may determine that the new candidate beam is associated with the first candidate beam subset. In some examples, the access resource manager 725 may select a random access resource corresponding to the new candidate beam from the first random access resource set to transmit the access message.

[0183] The BFR reporting manager 730 may configure the access message to indicate the first CORESET pool index value or the second CORESET pool index based on the detected beam failure.

[0184] The PCell BFR reporting manager 735 may configure an access message based on the detected beam failure to indicate that a beam failure was detected on the PCell. In some examples, the PCell BFR reporting manager 735 may transmit an access message using a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value.

[0185] The BFR response manager 740 may monitor for access response messages on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value. In some examples, the BFR response manager 740 may determine that the new candidate beam is associated with the first candidate beam subset. In some examples, the BFR response manager 740 may monitor for access response messages on the first recovery search space. In some examples, the BFR response manager 740 may receive a control channel signal in the first recovery search space. In some examples, the BFR response manager 740 may determine that the BFR procedure is complete based on receiving the control channel signal in the first recovery search space.

[0186] In some examples, the BFR response manager 740 may monitor for access response messages on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value, the first recovery search space and the second recovery search space being associated with a common CORESET. In some examples, the BFR response manager 740 may monitor for access response messages in the first recovery search space. In some examples, the BFR response manager 740 may determine that the new candidate beam is associated with the first CORESET pool index value or the second CORESET pool index value.

[0187] In some examples, the BFR response manager 740 may update the CORESET pool index value of the common CORESET based on the determination. In some examples, the BFR response manager 740 may update the CORESET pool index value of the common CORESET to correspond to the CORESET pool index value of the new candidate beam.

[0188] The QCL manager 745 may determine that the new candidate beam is associated with the first CORESET pool index value. In some examples, the QCL manager 745 may update the quasi co-location relationship for the CORESET indexed at 0 based on the determination, wherein the updated QCL relationship corresponds to the QCL configuration of the new candidate beam. In some examples, the QCL manager 745 may determine that the new candidate beam is associated with the first CORESET pool index value or the second CORESET pool index value.

[0189] In some examples, the QCL manager 745 may update a quasi-co-location relationship for each control resource associated with the first CORESET pool index value or the second CORESET pool index value based on the determination, wherein the updated QCL relationship corresponds to the QCL configuration of the new candidate beam. In some examples, the QCL manager 745 may update an activated transmission configuration indicator state set for the data channel to the transmission configuration indicator state of the new candidate beam.

[0190] The BFR procedure manager 750 may determine that a beam failure on an active beam of the PCell is associated with a first CORESET pool index value, wherein the BFR procedure includes a PCell BFR procedure. In some examples, a beam failure on an active beam of the PCell is determined to be associated with a second CORESET pool index value, wherein the BFR procedure includes a secondary cell BFR procedure. In some examples, the BFR procedure manager 750 may transmit an LRR message in an uplink control channel. In some examples, the BFR procedure manager 750 may receive a grant to schedule an uplink transmission of the UE based on the LRR message. In some examples, an uplink transmission including a MAC CE indicating a second CORESET pool index value of the PCell is transmitted.

[0191] Figure 8 A diagram of a system 800 including a device 805 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein or include components of these devices. The device 805 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., a bus 845).

[0192] The communication manager 810 may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; receive an indication of a set of candidate beams available for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; select a new candidate beam from the candidate beam set based on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam; detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value; and transmit an access message indicating the new candidate beam during the BFR procedure.

[0193] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as MS- 、MS- 、OS / , Or another known operating system. In other cases, I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with device 815 via I / O controller 805 or via hardware components controlled by I / O controller 815.

[0194] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0195] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0196] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 830 may include, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0197] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate the memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 830) so that the device 805 performs various functions (e.g., various functions or tasks of supporting a BFR for multiple TRPs in a PCell).

[0198] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0199] Fig. 9 A block diagram 900 of a device 905 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0200] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to BFR for multiple TRPs in a PCell, etc.). The information may be passed to other components of the device 905. The receiver 910 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 910 may utilize a single antenna or a collection of antennas.

[0201] The communication manager 915 may transmit to the UE a configuration of a carrier associated with a PCell associated with a base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmit an indication of a set of candidate beams that can be used for a BFR procedure, the set of candidate beams comprising a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; and receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam associated with the first CORESET pool index value or the second CORESET pool index value of the PCell, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam. The communication manager 915 may be an example of aspects of the communication manager 1210 described herein.

[0202] The communication manager 915 or its subcomponents 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 functions of the communication manager 915 or its subcomponents may be performed by a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The communication manager 915 or its subcomponents may be physically located at various locations, including being distributed so that parts of the functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be combined with one or more other hardware components (including but not limited to I / O components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0203] The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 920 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0204] Fig.10A block diagram 1000 of a device 1005 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1035. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0205] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to BFR for multiple TRPs in a PCell, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0206] The communication manager 1015 may be an example of aspects of the communication manager 915 as described herein. The communication manager 1015 may include a CC configuration manager 1020, a candidate beam manager 1025, and a BFR manager 1030. The communication manager 1015 may be an example of aspects of the communication manager 1210 described herein.

[0207] The CC configuration manager 1020 may transmit, to the UE, configuration regarding a carrier associated with a PCell associated with a base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value.

[0208] The candidate beam manager 1025 may transmit an indication of a set of candidate beams available for the BFR procedure, the set of candidate beams comprising a first subset of candidate beams associated with a first CORESET pool index value and a second subset of candidate beams associated with a second CORESET pool index value.

[0209] The BFR manager 1030 may receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam associated with a first CORESET pool index value or a second CORESET pool index value of the PCell, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0210] The transmitter 1035 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1035 can be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1035 can be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 1035 may utilize a single antenna or a collection of antennas.

[0211] Fig.11 A block diagram 1100 of a communication manager 1105 supporting BFR for multiple TRPs in a PCell is shown in accordance with aspects of the present disclosure. The communication manager 1105 may be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 described herein. The communication manager 1105 may include a CC configuration manager 1110, a candidate beam manager 1115, a BFR manager 1120, an access resource manager 1125, a BFR response manager 1130, a CORESET manager 1135, a QCL manager 1140, and a BFR procedure manager 1145. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0212] The CC configuration manager 1110 may transmit to the UE a configuration regarding a carrier associated with a PCell associated with a base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. In some examples, the CC configuration manager 1110 may configure, for the UE, a first random access resource set associated with a physical cell identifier and a second random access resource set associated with a physical cell identifier configured by radio resource control, wherein the access message is received on the first random access resource set or the second random access resource set.

[0213] In some cases, the first CORESET pool index value is associated with a physical cell identifier associated with the PCell, and the second CORESET pool index value is associated with a physical cell identifier configured by radio resource control. In some cases, the resources include a first candidate beam detection resource set associated with the physical cell identifier and a second candidate beam detection resource set associated with the physical cell identifier configured by radio resource control. In some cases, the new candidate beam is associated with a synchronization signal block that includes an index of a second synchronization signal block set.

[0214] The candidate beam manager 1115 may transmit an indication of a set of candidate beams available for the BFR procedure, the set of candidate beams comprising a first subset of candidate beams associated with a first CORESET pool index value and a second subset of candidate beams associated with a second CORESET pool index value.

[0215] The BFR manager 1120 may receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam associated with a first CORESET pool index value or a second CORESET pool index value of the PCell, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam. In some examples, the BFR manager 1120 may receive an access message using a first random access resource set associated with the first CORESET pool index value or a second random access resource set associated with the second CORESET pool index value, wherein the access message indicates that a beam failure was detected on the PCell. In some cases, the access message indicates the first CORESET pool index value or the second CORESET pool index.

[0216] The access resource manager 1125 may identify a first random access resource subset associated with a first candidate beam detection resource set corresponding to a first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource set corresponding to a second candidate beam subset, wherein the access message is received based on the first random access resource set or the second random access resource set. In some examples, the access resource manager 1125 may determine that the new candidate beam is associated with the first candidate beam subset, wherein the access message is received on a random access resource corresponding to the new candidate beam selected from the first random access resource set. In some examples, the access resource manager 1125 may transmit an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value.

[0217] The BFR response manager 1130 may transmit an access response message on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value. In some examples, the BFR response manager 1130 may determine that the new candidate beam is associated with the first candidate beam subset. In some examples, the BFR response manager 1130 may transmit the access response message on the first recovery search space. In some examples, the BFR response manager 1130 may transmit a control channel signal in the first recovery search space, wherein the BFR procedure is completed based on transmitting the control channel signal in the first recovery search space.

[0218] In some examples, the BFR response manager 1130 may transmit the access response message on a first recovery search space associated with a first CORESET pool index value or on a second recovery search space associated with a second CORESET pool index value, the first recovery search space and the second recovery search space being associated with a common CORESET. In some examples, the BFR response manager 1130 may determine that the new candidate beam is associated with the first candidate beam subset, wherein the access response message is transmitted in the first recovery search space.

[0219] The CORESET manager 1135 may update the CORESET pool index value of the common CORESET based on the access message. In some examples, the CORESET manager 1135 may update the CORESET pool index value of the common CORESET to correspond to the new candidate beam CORESET pool index value.

[0220] The QCL manager 1140 may update the QCL relationship for the CORESET indexed as 0 based on the access message, wherein the updated QCL relationship corresponds to the QCL configuration of the new candidate beam. In some examples, the QCL manager 1140 may update the quasi-co-location relationship for each control resource associated with the first CORESET pool index value or the second CORESET pool index value based on the access message, wherein the updated QCL relationship corresponds to the QCL configuration of the new candidate beam. In some examples, the QCL manager 1140 may update the activated transmission configuration indicator state set for the data channel to the transmission configuration indicator state of the new candidate beam.

[0221] The BFR procedure manager 1145 may determine that a beam failure on an active beam of the PCell is associated with a first CORESET pool index value, wherein the BFR procedure includes a PCell BFR procedure. In some examples, a beam failure on an active beam of the PCell is determined to be associated with a second CORESET pool index value, wherein the BFR procedure includes a secondary cell BFR procedure. In some examples, the BFR procedure manager 1145 may receive an LRR message in an uplink control channel. In some examples, the BFR procedure manager 1145 may transmit a grant to schedule an uplink transmission of the UE based on the LRR message. In some examples, an uplink transmission including a MAC CE indicating a second CORESET pool index value of the PCell is received.

[0222] Fig.12A diagram of a system 1200 including a device 1205 supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 as described herein or include components of the above devices. The device 1205 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0223] The communication manager 1210 may transmit to the UE a configuration regarding a carrier associated with a PCell associated with a base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value; transmit an indication of a set of candidate beams that can be used for a BFR procedure, the candidate beam set including a first candidate beam subset associated with the first CORESET pool index value and a second candidate beam subset associated with the second CORESET pool index value; and receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam.

[0224] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0225] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0226] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0227] Memory 1230 may include RAM, ROM, or a combination thereof. Memory 1230 may store computer readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, memory 1230 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0228] Processor 1240 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks of supporting BFR for multiple TRPs in a PCell).

[0229] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1245 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0230] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0231] Fig.13 1 is a flow chart illustrating a method 1300 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0232] At 1305, the UE may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Figures 5 to 8 The CC Configuration Manager described above is used to perform

[0233] At 1310, the UE may receive an indication of a candidate beam set that may be used for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described in reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0234] At 1315, the UE may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0235] At 1320, the UE may select a new candidate beam from the set of candidate beams based on monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be as described with reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0236] At 1325, the UE may transmit an access message indicating the new candidate beam during the BFR procedure. The operations of 1325 may be performed according to the methods described herein. In some examples, aspects of the operations of 1325 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0237] Fig.141 is a flow chart illustrating a method 1400 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0238] At 1405, the UE may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Figures 5 to 8 The CC Configuration Manager described above is used to perform

[0239] At 1410, the UE may receive an indication of a candidate beam set that may be used for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described in reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0240] At 1415, the UE may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0241] At 1420, the UE may select a new candidate beam from the set of candidate beams based on monitoring resources associated with the first CORESET pool index value or the second CORESET pool index value, the resources being mapped to the new candidate beam. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be as described with reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0242] At 1425, the UE may identify a first random access resource subset associated with a first candidate beam detection resource subset corresponding to the first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource subset corresponding to the second candidate beam subset, wherein the access message is transmitted based on the first random access resource set or the second random access resource set. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed as described with reference to Figures 5 to 8 The described access resource manager is executed.

[0243] At 1430, the UE may transmit an access message indicating the new candidate beam during the BFR procedure. The operations of 1430 may be performed according to the methods described herein. In some examples, aspects of the operations of 1430 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0244] Fig.15 1 is a flow chart illustrating a method 1500 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure. The operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0245] At 1505, the UE may receive a configuration regarding a carrier associated with a PCell, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Figures 5 to 8 The CC Configuration Manager described above is used to perform

[0246] At 1510, the UE may receive an indication of a candidate beam set that may be used for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0247] At 1515, the UE may detect a beam failure on the carrier on an active beam of the PCell associated with the first CORESET pool index value or the second CORESET pool index value. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0248] At 1520, the UE may select a new candidate beam from the set of candidate beams based on monitoring resources associated with the first CORESET pool index value or the second CORESET pool index value, the resources being mapped to the new candidate beam. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be as described with reference to Figures 5 to 8 The described candidate beam manager is implemented.

[0249] At 1525, the UE may transmit an access message indicating the new candidate beam during the BFR procedure. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described in reference to Figures 5 to 8 The BFR manager described is executed.

[0250] At 1530, the UE may monitor for access response messages on a first recovery search space configured with a first CORESET associated with a first CORESET pool index value or on a second recovery search space configured with a second CORESET associated with a second CORESET pool index value. The operations of 1530 may be performed according to the methods described herein. In some examples, aspects of the operations of 1530 may be performed as described in reference to Figures 5 to 8 The BFR response manager described is used to perform

[0251] Fig.16 1 is a flowchart illustrating a method 1600 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a base station 105 or components thereof as described herein. Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0252] At 1605, the base station may transmit to the UE a configuration regarding a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Figures 9 to 12 The CC Configuration Manager described above is used to perform

[0253] At 1610, the base station may transmit an indication of a candidate beam set that may be used for a BFR procedure, the candidate beam set comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Figures 9 to 12 The described candidate beam manager is implemented.

[0254] At 1615, the base station may receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam associated with a first CORESET pool index value or a second CORESET pool index value of the PCell, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 9 to 12 The BFR manager described is executed.

[0255] Fig.17 1 is a flowchart illustrating a method 1700 for supporting BFR for multiple TRPs in a PCell according to aspects of the present disclosure. The operations of the method 1700 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1700 may be implemented by a base station 105 or components thereof as described herein. Figures 9 to 12 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0256] At 1705, the base station may transmit to the UE a configuration regarding a carrier associated with a PCell associated with the base station, the carrier being configured with a first CORESET pool index value and a second CORESET pool index value. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Figures 9 to 12 The CC Configuration Manager described above is used to perform

[0257] At 1710, the base station may transmit an indication of a first random access resource set associated with a first CORESET pool index value and a second random access resource set associated with a second CORESET pool index value. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 9 to 12 The described access resource manager is executed.

[0258] At 1715, the base station may transmit an indication of a set of candidate beams that may be used for the BFR procedure, the set of candidate beams comprising a first candidate beam subset associated with a first CORESET pool index value and a second candidate beam subset associated with a second CORESET pool index value. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 9 to 12 The described candidate beam manager is implemented.

[0259] At 1720, the base station may receive an access message indicating a new candidate beam based on the UE detecting a beam failure on the carrier on an active beam associated with a first CORESET pool index value or a second CORESET pool index value of the PCell, the new candidate beam being selected from the set of candidate beams based on the UE monitoring a resource associated with the first CORESET pool index value or the second CORESET pool index value, the resource being mapped to the new candidate beam. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figures 9 to 12 The BFR manager described is executed.

[0260] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0261] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applied to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0262] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0263] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an 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. A general purpose processor may be a microprocessor, but in the alternative, 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0264] 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 on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present 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, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0265] Computer readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0266] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by phrases such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of 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 read 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 the present disclosure. In other words, as used herein, the phrase "based on" should be read in the same manner as the phrase "based at least in part on."

[0267] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0268] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. The term "exemplary" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than 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.

[0269] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the universal principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present 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. A method for wireless communication at a user equipment (UE), comprising: receiving a configuration regarding a carrier associated with a primary cell, the carrier being configured with a first control resource set pool index value and a second control resource set pool index value; receiving an indication of a set of candidate beams available for a beam failure recovery procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first control resource set pool index value and a second subset of candidate beams associated with the second control resource set pool index value; detecting a beam failure on the carrier on an active beam of the primary cell associated with the first control resource set pool index value or the second control resource set pool index value; selecting a new candidate beam from the set of candidate beams based at least in part on monitoring resources associated with the first control resource set pool index value or the second control resource set pool index value, the resources being mapped to the new candidate beam; as well as An access message indicating the new candidate beam is transmitted during the beam failure recovery procedure.

2. The method of claim 1, further comprising: Identify a first random access resource subset associated with a first candidate beam detection resource subset corresponding to the first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource subset corresponding to the second candidate beam subset, wherein the access message is transmitted at least in part based on the first random access resource set or the second random access resource set.

3. The method of claim 1, further comprising: An indication of a first random access resource set associated with the first control resource set pool index value and a second random access resource set associated with the second control resource set pool index value is received.

4. The method of claim 3, further comprising: Determining that the new candidate beam is associated with the first subset of candidate beams; as well as A random access resource corresponding to the new candidate beam is selected from the first random access resource set to transmit the access message.

5. The method of claim 1, further comprising: The access message is configured based at least in part on the detected beam failure to indicate the first control resource set pool index value or the second control resource set pool index value.

6. The method of claim 1, further comprising: configuring the access message based at least in part on the detected beam failure to indicate detection of the beam failure on the primary cell; as well as The access message is transmitted using a first random access resource set associated with the first control resource set pool index value and a second random access resource set associated with the second control resource set pool index value.

7. The method of claim 1, further comprising: An access response message is monitored on a first recovery search space configured with a first control resource set associated with the first control resource set pool index value or on a second recovery search space configured with a second control resource set associated with the second control resource set pool index value.

8. The method of claim 7, further comprising: Determining that the new candidate beam is associated with the first subset of candidate beams; as well as The first recovery search space is monitored for the access response message.

9. The method of claim 8, further comprising: Receiving a control channel signal in the first recovery search space; as well as The beam failure recovery procedure is determined to be complete based at least in part on receiving the control channel signal in the first recovery search space.

10. The method of claim 1, further comprising: An access response message is monitored on a first recovery search space associated with the first control resource set pool index value or on a second recovery search space associated with the second control resource set pool index value, the first recovery search space and the second recovery search space being associated with a common control resource set.

11. The method of claim 10, further comprising: Determining that the new candidate beam is associated with the first subset of candidate beams; as well as The first recovery search space is monitored for the access response message.

12. The method of claim 11, further comprising: Receiving a control channel signal in the first recovery search space; as well as The beam failure recovery procedure is determined to be complete based at least in part on receiving the control channel signal in the first recovery search space.

13. The method of claim 10, further comprising: Determine that the new candidate beam is associated with the first control resource pool index value or the second control resource pool index value; as well as A control resource set pool index value for the common set of control resources is updated based at least in part on the determination.

14. The method of claim 13, wherein updating the control resource set pool index value comprises: The control resource set pool index value of the common control resource set is updated to correspond to the control resource set pool index value of the new candidate beam.

15. The method of claim 1, further comprising: Determining that the new candidate beam is associated with the first control resource set pool index value; as well as A quasi co-location relationship for a control resource set indexed as 0 is updated based at least in part on the determination, wherein the updated quasi co-location relationship corresponds to a quasi co-location configuration of the new candidate beam.

16. The method of claim 1, further comprising: Determine that the new candidate beam is associated with the first control resource pool index value or the second control resource pool index value; as well as A quasi-colocation relationship for each control resource associated with the first control resource set pool index value or the second control resource set pool index value is updated based at least in part on the determination, wherein the updated quasi-colocation relationship corresponds to a quasi-colocation configuration of the new candidate beam.

17. The method of claim 16, further comprising: An activated transmission configuration indicator state set for the data channel is updated to the transmission configuration indicator state of the new candidate beam.

18. The method of claim 1, wherein the first control resource set pool index value is associated with a physical cell identifier associated with the primary cell, and the second control resource set pool index value is associated with a physical cell identifier of a radio resource control configuration.

19. The method of claim 18, wherein the resources include a first set of candidate beam detection resources associated with the physical cell identifier and a second set of candidate beam detection resources associated with the physical cell identifier of the radio resource control configuration.

20. The method of claim 18, wherein the new candidate beam is associated with a synchronization signal block comprising an index of a second set of synchronization signal blocks.

21. The method of claim 18, further comprising: A first set of random access resources associated with the physical cell identifier and a second set of random access resources associated with the radio resource control-configured physical cell identifier are identified, wherein the access message is transmitted on the first set of random access resources or the second set of random access resources.

22. The method of claim 1, further comprising: It is determined that the beam failure on the active beam of the primary cell is associated with the first control resource set pool index value, wherein the beam failure recovery procedure comprises a primary cell beam failure recovery procedure.

23. The method of claim 1, further comprising: It is determined that the beam failure on the active beam of the primary cell is associated with the second control resource set pool index value, wherein the beam failure recovery procedure includes a secondary cell beam failure recovery procedure.

24. The method of claim 23, wherein the secondary cell beam failure recovery procedure comprises: transmitting a link recovery request message in an uplink control channel; receiving a grant to schedule uplink transmissions for the UE based at least in part on the link recovery request message; as well as The uplink transmission comprising a media access control (MAC) control element (CE) indicating the second control resource set pool index value for the primary cell is transmitted.

25. A method for wireless communication at a base station, comprising: transmitting to a user equipment (UE) configuration regarding a carrier associated with a primary cell associated with the base station, the carrier being configured with a first control resource set pool index value and a second control resource set pool index value; transmitting an indication of a set of candidate beams that can be used for a beam failure recovery procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first control resource set pool index value and a second subset of candidate beams associated with the second control resource set pool index value; and Receiving an access message indicating a new candidate beam based at least in part on the UE detecting a beam failure on the carrier on an active beam of the primary cell associated with the first control resource pool index value or the second control resource pool index value, the new candidate beam being selected from the set of candidate beams based at least in part on the UE monitoring resources associated with the first control resource pool index value or the second control resource pool index value, the resources being mapped to the new candidate beam.

26. The method of claim 25, further comprising: Identify a first random access resource subset associated with a first candidate beam detection resource set corresponding to the first candidate beam subset and a second random access resource subset associated with a second candidate beam detection resource set corresponding to the second candidate beam subset, wherein the access message is received at least in part based on the first random access resource set or the second random access resource set.

27. The method of claim 26, further comprising: The new candidate beam is determined to be associated with the first subset of candidate beams, wherein the access message is received on a random access resource selected from the first set of random access resources corresponding to the new candidate beam.

28. The method of claim 25, further comprising: An indication of a first random access resource set associated with the first control resource set pool index value and a second random access resource set associated with the second control resource set pool index value is transmitted.

29. The method of claim 28, further comprising: The new candidate beam is determined to be associated with the first subset of candidate beams, wherein the access message is received on a random access resource selected from the first set of random access resources corresponding to the new candidate beam.

30. The method of claim 25, wherein the access message indicates the first control resource set pool index value or the second control resource set pool index value.

31. The method of claim 25, further comprising: The access message is received using a first random access resource set associated with the first control resource set pool index value or a second random access resource set associated with the second control resource set pool index value, wherein the access message indicates that the beam failure is detected on the primary cell.

32. The method of claim 25, further comprising: An access response message is transmitted on a first recovery search space configured with a first control resource set associated with the first control resource set pool index value or on a second recovery search space configured with a second control resource set associated with the second control resource set pool index value.

33. An apparatus for wireless communication at a user equipment (UE), comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory, the instructions being executable by the processor to cause the apparatus to: receiving a configuration regarding a carrier associated with a primary cell, the carrier being configured with a first control resource set pool index value and a second control resource set pool index value; receiving an indication of a set of candidate beams available for a beam failure recovery procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first control resource set pool index value and a second subset of candidate beams associated with the second control resource set pool index value; detecting a beam failure on the carrier on an active beam of the primary cell associated with the first control resource set pool index value or the second control resource set pool index value; selecting a new candidate beam from the set of candidate beams based at least in part on monitoring resources associated with the first control resource set pool index value or the second control resource set pool index value, the resources being mapped to the new candidate beam; as well as An access message indicating the new candidate beam is transmitted during the beam failure recovery procedure.

34. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving a configuration regarding a carrier associated with a primary cell, the carrier being configured with a first control resource set pool index value and a second control resource set pool index value; means for receiving an indication of a set of candidate beams available for use in a beam failure recovery procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first control resource set pool index value and a second subset of candidate beams associated with the second control resource set pool index value; means for detecting a beam failure on the carrier on an active beam of the primary cell associated with the first control resource set pool index value or the second control resource set pool index value; means for selecting a new candidate beam from the set of candidate beams based at least in part on monitoring resources associated with the first control resource set pool index value or the second control resource set pool index value, the resources being mapped to the new candidate beam; as well as Means for transmitting an access message indicating the new candidate beam during the beam failure recovery procedure.

35. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: receiving a configuration regarding a carrier associated with a primary cell, the carrier being configured with a first control resource set pool index value and a second control resource set pool index value; receiving an indication of a set of candidate beams available for a beam failure recovery procedure, the set of candidate beams comprising a first subset of candidate beams associated with the first control resource set pool index value and a second subset of candidate beams associated with the second control resource set pool index value; detecting a beam failure on the carrier on an active beam of the primary cell associated with the first control resource set pool index value or the second control resource set pool index value; selecting a new candidate beam from the set of candidate beams based at least in part on monitoring resources associated with the first control resource set pool index value or the second control resource set pool index value, the resources being mapped to the new candidate beam; and An access message indicating the new candidate beam is transmitted during the beam failure recovery procedure.

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