Beam Failure Recovery Based on Multiple Transmission and Reception Points

Abstract

A wireless device receives one or more radio resource control messages indicating: a first transmission and reception point (TRP) of a cell, a second TRP of the cell, and one or more first beam failure recovery parameters indicating one or more first reference signals for the first TRP of the cell. A first beam failure is determined based on the one or more first reference signals, of the first TRP, indicated by the one or more first beam failure recovery parameters. Based on the determining, an uplink signal indicating a link recovery request for the first TRP is transmitted via the second TRP of the cell.

What is claimed is: 
     
         1 . A method comprising:
 receiving, by a wireless device, one or more radio resource control (RRC) messages comprising configuration parameters indicating:
 a first beam failure detection (BFD) reference signal (RS) set of a cell; and 
 a second BFD RS set of the cell; 
   triggering a first beam failure recovery (BFR) procedure based on the first BFD RS set;   triggering a second BFR procedure based on the second BFD RS set; and   initiating a random access procedure on the cell based on both the first BFR procedure and the second BFR procedure being triggered.   
     
     
         2 . The method of  claim 1 , wherein the first BFD RS corresponds to a first transmission and reception point (TRP) and the second BFD RS corresponds to a second TRP. 
     
     
         3 . The method of  claim 1 , wherein the configuration parameters further indicate:
 a first control resource set (coreset) group associated with the first BFD RS set; and   a second coreset group associated with the second BFD RS set.   
     
     
         4 . The method of  claim 1 , wherein the initiating the random access procedure is further based on both the first BFR procedure and the second BFR procedure failing. 
     
     
         5 . The method of  claim 4 , further comprising:
 determining the first BFR procedure failed based on a signal power of the first BFD RS set; and   determining the second BFR procedure failed based on a signal power of the second BFD RS set.   
     
     
         6 . The method of  claim 5 , further comprising determining the first BFR procedure failed further based on a first beam failure indication counter. 
     
     
         7 . The method of  claim 5 , further comprising determining the second BFR procedure failed further based on a second beam failure indication counter. 
     
     
         8 . The method of  claim 1 , wherein initiating the random access procedure comprises selecting a random access channel (RACH) resource based on one of the first BFD RS set or the second BFD RS set. 
     
     
         9 . The method of  claim 8 , further comprising transmitting a physical RACH (PRACH) transmission via the RACH resource. 
     
     
         10 . The method of  claim 1 , wherein the cell is one of a primary cell or a secondary primary cell. 
     
     
         11 . A wireless device comprising:
 one or more processors; and   a memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
 receive one or more radio resource control (RRC) messages comprising configuration parameters indicating:
 a first beam failure detection (BFD) reference signal (RS) set of a cell; and 
 a second BFD RS set of the cell; 
 
 trigger a first beam failure recovery (BFR) procedure based on the first BFD RS set; 
 trigger a second BFR procedure based on the second BFD RS set; and 
 initiate a random access procedure on the cell based on both the first BFR procedure and the second BFR procedure being triggered. 
   
     
     
         12 . The wireless device of  claim 11 , wherein the first BFD RS corresponds to a first transmission and reception point (TRP) and the second BFD RS corresponds to a second TRP. 
     
     
         13 . The wireless device of  claim 11 , wherein the configuration parameters further indicate:
 a first control resource set (coreset) group associated with the first BFD RS set; and   a second coreset group associated with the second BFD RS set.   
     
     
         14 . The wireless device of  claim 11 , wherein the random access procedure is further initiated based on both the first BFR procedure and the second BFR procedure failing. 
     
     
         15 . The wireless device of  claim 14 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
 determine the first BFR procedure failed based on a signal power of the first BFD RS set; and   determine the second BFR procedure failed based on a signal power of the second BFD RS set.   
     
     
         16 . The wireless device of  claim 15 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine the first BFR procedure failed further based on a first beam failure indication counter. 
     
     
         17 . The wireless device of  claim 15 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine the second BFR procedure failed further based on a second beam failure indication counter. 
     
     
         18 . The wireless device of  claim 11 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to select a random access channel (RACH) resource based on one of the first BFD RS set or the second BFD RS set. 
     
     
         19 . The wireless device of  claim 18 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit a physical RACH (PRACH) transmission via the RACH resource. 
     
     
         20 . A system comprising:
 a base station; and   a wireless device comprising:
 one or more processors; and 
 memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
 receive, from the base station, one or more radio resource control (RRC) messages comprising configuration parameters indicating:
 a first beam failure detection (BFD) reference signal (RS) set of a cell; and 
 a second BFD RS set of the cell; 
 
 trigger a first beam failure recovery (BFR) procedure based on the first BFD RS set; 
 trigger a second BFR procedure based on the second BFD RS set; and 
 initiate a random access procedure on the cell based on both the first BFR procedure and the second BFR procedure being triggered.