Method and apparatus for transmitting and receiving beam failure recovery request for secondary cell

Abstract

A communication method and system for converging a 5th generation (5G) communication system for supporting higher data rates beyond a 4th generation (4G) system with a technology for Internet of things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology. A method performed by a terminal for beam failure recovery (BFR) on a secondary cell (SCell) in a wireless communication system comprises receiving information for BFR on an SCell including a scheduling request configuration for the BFR on the SCell; detecting beam failure on the SCell based on whether a number of beam failure instances within a preconfigured time duration exceeds a preconfigured number; and, as a response to detecting the beam failure on the SCell, transmitting a scheduling request for the BFR on the SCell based on the scheduling request configuration.

What is claimed is: 
     
         1 . A method performed by a terminal for beam failure recovery (BFR) on a secondary cell (SCell) in a wireless communication system, the method comprising:
 receiving, from a base station, information for BFR on an SCell including a scheduling request configuration for the BFR on the SCell;   detecting beam failure on the SCell based on whether a number of beam failure instances within a preconfigured time duration exceeds a preconfigured number; and   as a response to detecting the beam failure on the SCell, transmitting, to the base station, a scheduling request for the BFR on the SCell based on the scheduling request configuration.   
     
     
         2 . The method of  claim 1 , wherein the information for the BFR on the SCell includes a list of reference signals identifying candidate beams for the BFR on the SCell and a reference signal received power (RSRP) threshold for a candidate beam. 
     
     
         3 . The method of  claim 2 , wherein the reference signals include at least one of a synchronization signal block (SSB) or a channel state information reference signal. 
     
     
         4 . The method of  claim 2 , further comprising:
 receiving, from the base station, an uplink (UL) grant corresponding to the scheduling request;   generating a BFR media access control (MAC) control element (CE) including a candidate beam availability indication, the candidate beam availability indication indicating whether at least one of the reference signals in the list with RSRP above the RSRP threshold is available; and   transmitting, to the base station, the generated BFR MAC CE.   
     
     
         5 . The method of  claim 4 , wherein the BFR MAC CE has a priority higher than a MAC CE for a buffer state report (BSR) with exception of a BSR included for padding, a single entry power headroom report (PHR) MAC CE or multiple entry PHR MAC CE, data from any logical channel except data from uplink (UL)-common control channel (CCCH), a MAC CE for recommended bit rate query, or a MAC CE for BSR included for padding. 
     
     
         6 . The method of  claim 2 , wherein the list of reference signals and the RSRP threshold are configured per a bandwidth part in the SCell, and the scheduling request configuration is configured per a cell group to which the SCell belongs. 
     
     
         7 . A method performed by a base station for beam failure recovery (BFR) on a secondary cell (SCell) in a wireless communication system, the method comprising:
 transmitting, to a terminal, information for BFR on an SCell including a scheduling request configuration for the BFR on the SCell; and   receiving, from the terminal, a scheduling request for the BFR on the SCell based on the scheduling request configuration.   
     
     
         8 . The method of  claim 7 , wherein the information for the BFR on the SCell includes a list of reference signals identifying candidate beams for the BFR on the SCell and a reference signal received power (RSRP) threshold for a candidate beam, the reference signals including at least one of a synchronization signal block (SSB) or a channel state information reference signal. 
     
     
         9 . The method of  claim 8 , further comprising:
 transmitting, to the terminal, an uplink (UL) grant corresponding to the scheduling request; and   receiving, from the terminal, a BFR media access control (MAC) control element (CE) including a candidate beam availability indication, the candidate beam availability indication indicating whether at least one of the reference signals in the list with RSRP above the RSRP threshold is available.   
     
     
         10 . The method of  claim 9 , wherein the BFR MAC CE has a priority higher than a MAC CE for a buffer state report (BSR) with exception of a BSR included for padding, a single entry power headroom report (PHR) MAC CE or multiple entry PHR MAC CE, data from any logical channel except data from uplink (UL)-common control channel (CCCH), a MAC CE for recommended bit rate query, or a MAC CE for BSR included for padding. 
     
     
         11 . The method of  claim 8 , wherein the list of reference signals and the RSRP threshold are configured per a bandwidth part in the SCell, and the scheduling request configuration is configured per a cell group to which the SCell belongs. 
     
     
         12 . A terminal in a wireless communication system, the terminal comprising:
 a transceiver; and   at least one processor operatively coupled with the transceiver and configured to:   receive, from a base station via the transceiver, information for beam failure recovery (BFR) on a secondary cell (SCell) including a scheduling request configuration for the BFR on the SCell,   detect beam failure on the SCell based on whether a number of beam failure instances within a preconfigured time duration exceeds a preconfigured number, and   as a response to detecting the beam failure on the SCell, transmit, to the base station via the transceiver, a scheduling request for the BFR on the SCell based on the scheduling request configuration.   
     
     
         13 . The terminal of  claim 12 , wherein the information for the BFR on the SCell includes a list of reference signals identifying candidate beams for the BFR on the SCell and a reference signal received power (RSRP) threshold for a candidate beam, the reference signals including at least one of a synchronization signal block (SSB) or a channel state information reference signal. 
     
     
         14 . The terminal of  claim 13 , wherein the at least one processor further configured to:
 receive, from the base station via the transceiver, an uplink (UL) grant corresponding to the scheduling request,   generate a BFR media access control (MAC) control element (CE) including a candidate beam availability indication, the candidate beam availability indication indicating whether at least one of the reference signals in the list with reference signal received power (RSRP) above the RSRP threshold is available, and   transmit, to the base station via the transceiver, the generated BFR MAC CE.   
     
     
         15 . The terminal of  claim 14 , wherein the BFR MAC CE has a priority higher than a MAC CE for a buffer state report (BSR) with exception of a BSR included for padding, a single entry power headroom report (PHR) MAC CE or multiple entry PHR MAC CE, data from any logical channel except data from uplink (UL)-common control channel (CCCH), a MAC CE for recommended bit rate query, or a MAC CE for BSR included for padding. 
     
     
         16 . The terminal of  claim 13 , wherein the list of reference signals and the RSRP threshold are configured per a bandwidth part in the SCell, and the scheduling request configuration is configured per a cell group to which the SCell belongs. 
     
     
         17 . A base station in a wireless communication system, the base station comprising:
 a transceiver; and   at least one processor operatively coupled with the transceiver and configured to:   transmit, to a terminal via the transceiver, information for beam failure recovery (BFR) on a secondary cell (SCell) including a scheduling request configuration for the BFR on the SCell, and   receive, from the terminal via the transceiver, a scheduling request for the BFR on the SCell based on the scheduling request configuration.   
     
     
         18 . The base station of  claim 17 , wherein the information for the BFR on the SCell includes a list of reference signals identifying candidate beams for the BFR on the SCell and a reference signal received power (RSRP) threshold for a candidate beam, the reference signals including at least one of a synchronization signal block (SSB) or a channel state information reference signal. 
     
     
         19 . The base station of  claim 18 , wherein the at least one processor is further configured to:
 transmit, to the terminal via the transceiver, an uplink (UL) grant corresponding to the scheduling request, and   receive, from the terminal via the transceiver, a BFR media access control (MAC) control element (CE) including a candidate beam availability indication, the candidate beam availability indication indicating whether at least one of the reference signals in the list with RSRP above the RSRP threshold is available.   
     
     
         20 . The base station of  claim 19 , wherein the BFR MAC CE has a priority higher than a MAC CE for a buffer state report (BSR) with exception of a BSR included for padding, a single entry power headroom report (PHR) MAC CE or multiple entry PHR MAC CE, data from any logical channel except data from uplink (UL)-common control channel (CCCH), a MAC CE for recommended bit rate query, or a MAC CE for BSR included for padding.