Beam failure recovery for reduced capability (RedCap) wireless devices
In some embodiments, a wireless device receives one or more messages indicating: a first random access (RA) search space (SS) on a first initial bandwidth part (BWP), of a cell, for a first wireless device type; and a second RA SS on a second initial BWP, of the cell, for a second wireless device type. The wireless device transmits a preamble. Based on the wireless device being of the first wireless device type, the wireless device monitors, via the first RA SS on the first initial BWP, a control channel for a response to the preamble. Then the wireless device receives the response on the first initial BWP.
1 . 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 one or more system information block 1 (SIB1) messages comprising:
a first physical downlink control channel (PDCCH) configuration of a first initial downlink bandwidth part (BWP), of a cell, used to receive downlink messages during, and/or after, initial access, wherein first synchronization signal blocks (SSBs) are received using the first initial downlink BWP and first SSB parameters;
a second PCCH configuration of a second initial downlink BWP, of the cell, dedicated for reduced capability (RedCap) user equipments (UEs) and used to receive downlink messages during, and/or after, initial access, wherein second SSBs dedicated for the RedCap UEs are received using the second initial downlink BWP and second SSB parameters; and
in response to the wireless device being a RedCap UE, perform a beam failure recovery based on a measurement on the second SSBs via the second initial downlink BWP.
2 . The wireless device of claim 1 , wherein the first initial BWP and the first SSBs are for non-RedCap UEs.
3 . The wireless device of claim 1 , wherein the instructions further cause the wireless device to determine whether to use the first SSBs or the second SSBs based on the wireless device being the RedCap UE.
4 . The wireless device of claim 1 , wherein:
the first initial BWP contains a control resource set (coreset) with a coreset index of zero; and
the second initial BWP contains the coreset with the coreset index of zero.
5 . The wireless device of claim 1 , wherein the instructions further cause the wireless device to transmit a beam failure recovery request based on initiating the beam failure recovery.
6 . The wireless device of claim 1 , wherein:
the first initial downlink BWP is different from the second initial downlink BWP; and
the first SSBs are different from the second SSBs.
7 . The wireless device of claim 1 , wherein the one or more SIB 1 messages comprise the first SSB parameters.
8 . A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
transmit, to a wireless device, one or more system information block 1 (SIB1) messages comprising:
a first physical downlink control channel (PDCCH) configuration of a first initial downlink bandwidth part (BWP), of a cell, used to receive downlink messages during, and/or after, initial access, wherein first synchronization signal blocks (SSBs) are received using the first initial downlink BWP and first SSB parameters;
a second PCCH configuration of a second initial downlink BWP, of the cell, dedicated for reduced capability (RedCap) user equipments (UEs) and used to receive downlink messages during, and/or after, initial access, wherein second SSBs dedicated for the RedCap UEs are received using the second initial downlink BWP and second SSB parameters; and
in response to the wireless device being a RedCap UE, receive a beam failure recovery request from the wireless device based on a measurement on the second SSBs via the second initial downlink BWP.
9 . The base station of claim 8 , wherein the first initial BWP and the first SSBs are for non-RedCap UEs.
10 . The base station of claim 8 , wherein the instructions further cause the base station to determine whether the wireless device uses, for beam failure recovery, the first SSBs or the second SSBs based on the wireless device being the RedCap UE.
11 . The base station of claim 8 , wherein:
the first initial BWP contains a control resource set (coreset) with a coreset index of zero; and
the second initial BWP contains the coreset with the coreset index of zero.
12 . The base station of claim 8 , wherein:
the first initial downlink BWP is different from the second initial downlink BWP; and
the first SSBs are different from the second SSBs.
13 . The base station of claim 8 , wherein the one or more SIB1 messages comprise the first SSB parameters.
14 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive one or more system information block 1 (SIB1) messages comprising:
a first physical downlink control channel (PDCCH) configuration of a first initial downlink bandwidth part (BWP), of a cell, used to receive downlink messages during, and/or after, initial access, wherein first synchronization signal blocks (SSBs) are received using the first initial downlink BWP and first SSB parameters;
a second PCCH configuration of a second initial downlink BWP, of the cell, dedicated for reduced capability (RedCap) user equipments (UEs) and used to receive downlink messages during, and/or after, initial access, wherein second SSBs dedicated for the RedCap UEs are received using the second initial downlink BWP and second SSB parameters; and
in response to the wireless device being a RedCap UE, perform a beam failure recovery based on a measurement on the second SSBs via the second initial downlink BWP.
15 . The non-transitory computer-readable medium of claim 14 , wherein the first initial BWP and the first SSBs are for non-RedCap UEs.
16 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the wireless device to determine whether to use the first SSBs or the second SSBs based on the wireless device being the RedCap UE.
17 . The non-transitory computer-readable medium of claim 14 , wherein:
the first initial BWP contains a control resource set (coreset) with a coreset index of zero; and
the second initial BWP contains the coreset with the coreset index of zero.
18 . The non-transitory computer-readable medium of claim 14 , wherein the instructions further cause the wireless device to transmit a beam failure recovery request based on initiating the beam failure recovery.
19 . The non-transitory computer-readable medium of claim 14 , wherein:
the first initial downlink BWP is different from the second initial downlink BWP; and
the first SSBs are different from the second SSBs.
20 . The non-transitory computer-readable medium of claim 14 , wherein the one or more SIB1 messages comprise the first SSB parameters.