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EP-3826358-B1 - BEAM FAILURE RECOVERY METHOD, TERMINAL DEVICE, AND NETWORK SIDE DEVICE

EP3826358B1EP 3826358 B1EP3826358 B1EP 3826358B1EP-3826358-B1

Inventors

  • YANG, YU
  • SUN, PENG

Dates

Publication Date
20260513
Application Date
20190708

Claims (8)

  1. A beam failure recovery method, executed by a terminal device, and charactrized by comprising: receiving (S210) higher layer signaling, wherein the higher layer signaling comprises configuration information of a control resource set for beam failure recovery, CORESET-BFR, configured for the terminal device, wherein the configuration information of the CORESET-BFR comprises: a cell index of a cell on which the CORESET-BFR is located; wherein the method further comprises: sending a beam failure recovery request, BFRQ, in a case that the terminal device determines that a beam failure event occurs in a first cell; switching to a second cell corresponding to the cell index, wherein the first cell and the second cell are different cells; determining quasi-colocation, QCL, information of the CORESET-BFR; and receiving beam failure recovery request response information based on the QCL information of the CORESET-BFR on the second cell.
  2. The method according to claim 1, wherein the sending a BFRQ when the terminal device determines that a beam failure event occurs in a first cell comprises: determining a target beam reference signal for beam failure recovery; and sending the BFRQ by using a preconfigured target channel resource, wherein the BFRQ comprises identification information of the target beam reference signal.
  3. The method according to claim 1, wherein the configuration information of the CORESET-BFR further comprises a transmission configuration indication state, TCI, state of the CORESET-BFR.
  4. The method according to claim 3, wherein the determining QCL information of the CORESET-BFR comprises: determining the QCL information of the CORESET-BFR based on the TCI state of the CORESET-BFR.
  5. A terminal device (400), charactrized by comprising: a receiving module (401), configured to receive higher layer signaling, wherein the higher layer signaling comprises configuration information of a CORESET-BFR configured for the terminal device, wherein the configuration information of the CORESET-BFR comprises: a cell index of a cell on which the CORESET-BFR is located; wherein the terminal device further comprises: a sending module, configured to send a beam failure recovery request, BFRQ, in a case that the terminal device determines that a beam failure event occurs in a first cell; a switching module, configured to switch to a second cell corresponding to the cell index, wherein the first cell and the second cell are different cells; a determining module, configured to determine quasi-colocation, QCL, information of the CORESET-BFR; and wherein the receiving module is further configured to receive beam failure recovery request response information based on the QCL information of the CORESET-BFR on the second cell.
  6. The terminal device according to claim 5, wherein the the sending module is further configured to: determine a target beam reference signal for beam failure recovery; and send the BFRQ by using a preconfigured target channel resource, wherein the BFRQ comprises identification information of the target beam reference signal.
  7. The terminal device according to claim 5, wherein the configuration information of the CORESET-BFR further comprises a transmission configuration indication state, TCI, state of the CORESET-BFR.
  8. The terminal device according to claim 7, wherein the determining module is further configured to: determine the QCL information of the CORESET-BFR based on the TCI state of the CORESET-BFR.

Description

TECHNICAL FIELD The present disclosure relates to the communications field, and in particular, to a beam failure recovery method, a terminal device, and a network side device. BACKGROUND A large-scale antenna technology is introduced into New Radio (New Radio, NR) of a fifth-generation (5G) mobile communications system, to better support a multi-user multiple-input multiple-output (Multi-User Multiple-Input Multiple-Output, MU-MIMO) antenna technology. To reduce device costs and baseband processing complexity caused by a large-scale antenna array, a digital-analog hybrid beamforming technology is used to achieve a relatively coarse match between a transmit signal and a channel. However, in a multi-carrier system based on the digital-analog hybrid beamforming technology, the related technology still lacks a solution to flexibly configure a control resource set for beam failure recovery (Control Resource Set Beam Failure Recovery, CORESET-BFR). The following 3GPP Draft contributions disclose relevant technical asepcts: "Issues on BWP switch and search space configuration for BFR" (R2-1810641) discusses issues on BWP switch for BFR random access. "Corrections for beam failure recovery configuration" (R2-1810016) proposes that the index of DL BWP on which the recoverySearchSpaceId is configured should be the same as the UL BWP on which the BeamFailureRecoveryConfig is configured. "Remaining issues on mechanism to recover from beam failure" ("R1-1803818") disscusses beam failure recovery mechanism. "Summary 1 on remaining issues on beam failure recovery" (R1-1807661) dissusses remaining issues on beam failure recovery. "Discussions on RA for SCells BFR" (3GPP DRAFT; R2-1805905) discusses methods for SCells BFR. SUMMARY The invention is set out in the appended set of claims. An objective of embodiments of the present disclosure is to provide a beam failure recovery method, a terminal device, and a network side device, to resolve a problem that a CORESET-BFR cannot be flexibly configured in a multi-carrier system. According to a first aspect, an embodiment of the present disclosure provides a beam failure recovery method, applied to a terminal device, where the method includes: receiving higher layer signaling, where the higher layer signaling includes configuration information of a CORESET-BFR configured for the terminal device, wherethe configuration information of the CORESET-BFR includes: a cell index of a cell on which the CORESET-BFR is located. The method further includes: sending a beam failure recovery request, BFRQ, in a case that the terminal device determines that a beam failure event occurs in a first cell; switching to a second cell corresponding to the cell index, wherein the first cell and the second cell are different cells; determining quasi-colocation, QCL, information of the CORESET-BFR; and receiving beam failure recovery request response information based on the QCL information of the CORESET-BFR on the second cell. According to a third aspect, an embodiment of the present disclosure further provides a terminal device, including: a receiving module, configured to receive higher layer signaling, where the higher layer signaling includes configuration information of a CORESET-BFR configured for the terminal device, wherethe configuration information of the CORESET-BFR includes: a cell index of a cell on which the CORESET-BFR is located. The terminal device further includes: a sending module, configured to send a beam failure recovery request, BFRQ, in a case that the terminal device determines that a beam failure event occurs in a first cell; a switching module, configured to switch to a second cell corresponding to the cell index, wherein the first cell and the second cell are different cells; a determining module, configured to determine quasi-colocation, QCL, information of the CORESET-BFR; and wherein the receiving module is further configured to receive beam failure recovery request response information based on the QCL information of the CORESET-BFR on the second cell. In the embodiments of the present disclosure, the cell index of the cell on which the CORESET-BFR is located and/or the BWP index of the BWP on which the CORESET-BFR is located are added to the configuration information of the CORESET-BFR, so that a CORESET-BFR can be effectively and flexibly configured by using higher layer signaling in a multi-carrier system. BRIEF DESCRIPTION OF DRAWINGS The accompanying drawings illustrated herein are intended to provide a further understanding of the present disclosure and form a part of the present disclosure. The illustrative embodiments of the present disclosure and descriptions thereof are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the accompanying drawings: FIG. 1 is a schematic diagram of a network architecture according to an embodiment of the present disclosure;FIG. 2 is a schematic flowchart of a beam failu