Reconfigurable intelligent surface or repeater assisted synchronization signal block transmission and initial access
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a synchronization signal block (SSB) transmitted by a base station. The UE may receive system information that includes reconfigurable intelligent surface (RIS) or repeater assisted initial access information that identifies a set of SSBs that are associated with an RIS or a repeater and a modulation signature associated with the RIS or the repeater. The UE may selectively perform initial access using the SSB or search for another SSB based at least in part on the RIS or repeater assisted initial access information. Numerous other aspects are described.
1 . A user equipment (UE) for wireless communication, the UE comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
receive information identifying a modulation signature associated with a reconfigurable intelligent surface (RIS) or a repeater; and
select between performing initial access using a synchronization signal block (SSB) and searching for another SSB based at least in part on the information.
2 . The UE of claim 1 , wherein the one or more processors are further configured to:
perform initial access using the SSB based at least in part on the SSB being modulated with the modulation signature.
3 . The UE of claim 2 , wherein the initial access is RIS-assisted initial access.
4 . The UE of claim 1 , wherein the one or more processors are further configured to:
search for another SSB to perform initial access based at least in part on the SSB not being modulated with the modulation signature.
5 . The UE of claim 1 , wherein the modulation signature modulates at least one of a phase, an amplitude, a frequency, or a polarization at symbol boundaries of a signal redirected from the RIS or the repeater.
6 . The UE of claim 1 , wherein the information indicates a set of SSBs that are associated with the RIS or the repeater.
7 . The UE of claim 6 , wherein the one or more processors are further configured to:
perform initial access using another SSB based at least in part on the SSB not being included in the set of SSBs associated with the RIS or the repeater.
8 . The UE of claim 1 , wherein the information is initial access information that is RIS-assisted initial access information or repeater-assisted initial access information.
9 . The UE of claim 1 , wherein the one or more processors are further configured to:
receive the SSB, and wherein the selection between performing initial access using the SSB and searching for another SSB is based at least in part on receiving the SSB.
10 . A network entity for wireless communication, the network entity comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit a synchronization signal block (SSB) burst set including a first set of SSBs and a second set of SSBs; and
transmit information identifying a modulation signature associated with a reconfigurable intelligent surface (RIS) or a repeater.
11 . The network entity of claim 10 , wherein the modulation signature associated with the RIS or the repeater modulates at least one of a phase, an amplitude, a frequency, or a polarization at symbol boundaries of a signal redirected from the RIS or the repeater.
12 . The network entity of claim 10 , wherein the one or more processors, to transmit the SSB burst set, are configured to:
transmit the second set of SSBs toward the RIS or the repeater.
13 . The network entity of claim 10 , wherein the information indicates that the second set of SSBs is associated with the RIS or the repeater.
14 . The network entity of claim 10 , wherein the first set of SSBs is associated with direct transmission from the network entity.
15 . The network entity of claim 10 , wherein the information is initial access information that is RIS-assisted initial access information or repeater-assisted initial access information.
16 . A method of wireless communication performed by a user equipment (UE), the method comprising:
receiving information identifying a modulation signature associated with a reconfigurable intelligent surface (RIS) or a repeater; and
selecting between performing initial access using a synchronization signal block (SSB) and searching for another SSB based at least in part on the information.
17 . The method of claim 16 , further comprising:
performing initial access using the SSB based at least in part on the SSB being modulated with the modulation signature.
18 . The method of claim 16 , further comprising:
searching for another SSB to perform initial access based at least in part on the SSB not being modulated with the modulation signature.
19 . The method of claim 16 , wherein the information indicates a set of SSBs that are associated with the RIS or the repeater.
20 . The method of claim 16 , further comprising:
receiving the SSB, wherein the selecting between performing initial access using the SSB and searching for another SSB is based at least in part on receiving the SSB.