Synchronization signal block configuration for bandwidth narrower than a minimum bandwidth
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link. The UE may decode the SSB based at least in part on the SSB configuration. Numerous other aspects are described.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a base station, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link, wherein the SSB includes one or more punctured edges such that the SSB includes a set of resource blocks (RBs) only in a frequency region that is within the maximum bandwidth of the operating band, and wherein RBs in the punctured edges are not received by the UE; and
decoding the SSB based at least in part on the SSB configuration.
2 . The method of claim 1 ,
wherein a portion of bits transmitted in a physical broadcast channel of the SSB are predefined.
3 . The method of claim 1 ,
wherein the set of RBs in the frequency region carry a secondary synchronization signal and a physical broadcast channel demodulation reference signal that have an equivalent energy per resource element.
4 . The method of claim 1 ,
wherein decoding the SSB includes:
refraining from performing channel estimation using a physical broadcast channel demodulation reference signal in the one or more punctured edges; and
decoding only the set of RBs in the frequency region of the SSB that is within the maximum bandwidth of the operating band.
5 . The method of claim 1 ,
wherein decoding the SSB includes:
determining the one or more punctured edges based at least in part on a configuration associated with the operating band or based at least in part on blind detection of a pseudo-noise sequence associated with a physical broadcast channel in the frequency region of the SSB that is within the maximum bandwidth of the operating band.
6 . The method of claim 1 ,
wherein the SSB includes a symbol to carry one or more physical broadcast channel (PBCH) resource blocks (RBs) located in the one or more punctured edges outside the frequency region of the SSB that is within the maximum bandwidth of the operating band.
7 . The method of claim 6 ,
wherein the SSB configuration includes a resource element mapping for the symbol to carry the one or more PBCH RBs.
8 . The method of claim 1 ,
wherein the SSB includes a first set of resource blocks (RBs) that are transmitted in a first SSB occasion only in an upper frequency region that is within the maximum bandwidth of the operating band, and a second set of RBs that are transmitted in a second SSB occasion only in a lower frequency region that is within the maximum bandwidth of the operating band.
9 . The method of claim 8 ,
wherein decoding the SSB includes:
combining a first portion of a physical broadcast channel (PBCH) carried in the upper frequency region in the first SSB occasion with a second portion of the PBCH carried in the lower frequency region in the second SSB occasion.
10 . The method of claim 1 ,
wherein the SSB configuration is based at least in part on a sidelink SSB configuration requiring a minimum bandwidth that is narrower than the maximum bandwidth of the operating band.
11 . The method of claim 10 ,
wherein the SSB configuration includes an initial group of symbols that carry a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and wherein the SSB configuration further includes a final symbol that carries a repeated PSS symbol, a repeated SSS symbol, a repeated PBCH symbol, or a downlink transmission.
12 . The method of claim 1 , further comprising:
refraining from decoding RBs in the punctured edges.
13 . A method of wireless communication performed by a base station, comprising:
determining a synchronization signal block (SSB) configuration for an operating band associated with the base station, wherein the operating band has a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link; and
transmitting an SSB based at least in part on the SSB configuration, wherein the SSB includes one or more punctured edges such that the SSB includes a set of resource blocks (RBs) only in a frequency region that is within the maximum bandwidth of the operating band, and wherein RBs in the punctured edges are not transmitted by the base station.
14 . The method of claim 13 ,
wherein a portion of bits transmitted in a physical broadcast channel of the SSB are predefined.
15 . The method of claim 13 ,
wherein the set of RBs in the frequency region carry a secondary synchronization signal and a physical broadcast channel demodulation reference signal that have an equivalent energy per resource element.
16 . The method of claim 13 ,
wherein the SSB includes a pseudo-noise sequence associated with a physical broadcast channel in the frequency region of the SSB that is within the maximum bandwidth of the operating band.
17 . The method of claim 13 ,
wherein the SSB includes a symbol to carry one or more physical broadcast channel (PBCH) resource blocks (RBs) located in the one or more punctured edges outside the frequency region of the SSB that is within the maximum bandwidth of the operating band.
18 . The method of claim 17 ,
wherein the SSB configuration includes a resource element mapping for the symbol to carry the one or more PBCH RBS.
19 . The method of claim 13 ,
wherein the SSB includes a first set of resource blocks (RBs) that are transmitted in a first SSB occasion only in an upper frequency region that is within the maximum bandwidth of the operating band, and a second set of RBs that are transmitted in a second SSB occasion only in a lower frequency region that is within the maximum bandwidth of the operating band.
20 . The method of claim 13 ,
wherein the SSB configuration is based at least in part on a sidelink SSB configuration requiring a minimum bandwidth that is narrower than the maximum bandwidth of the operating band.
21 . The method of claim 20 ,
wherein the SSB configuration includes an initial group of symbols that carry a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and wherein the SSB configuration further includes a final symbol that carries a repeated PSS symbol, a repeated SSS symbol, a repeated PBCH symbol, or a downlink transmission.
22 . A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
receive, from a base station, a synchronization signal block (SSB) associated with an SSB configuration for an operating band having a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link, wherein the SSB includes one or more punctured edges such that the SSB includes a set of resource blocks (RBs) only in a frequency region that is within the maximum bandwidth of the operating band, and wherein RBs in the punctured edges are not received by the UE; and
decode the SSB based at least in part on the SSB configuration.
23 . The UE of claim 22 ,
wherein the SSB includes a first set of resource blocks (RBs) that are transmitted in a first SSB occasion only in an upper frequency region that is within the maximum bandwidth of the operating band, and a second set of RBs that are transmitted in a second SSB occasion only in a lower frequency region that is within the maximum bandwidth of the operating band.
24 . The UE of claim 22 ,
wherein the SSB configuration is based at least in part on a sidelink SSB configuration requiring a minimum bandwidth that is narrower than the maximum bandwidth of the operating band.
25 . The UE of claim 22 , wherein the one or more processors are further configured to:
refrain from decoding RBs in the punctured edges.
26 . The UE of claim 22 ,
wherein a portion of bits transmitted in a physical broadcast channel of the SSB are predefined.
27 . UE of claim 22 ,
wherein the set of RBs in the frequency region carry a secondary synchronization signal and a physical broadcast channel demodulation reference signal that have an equivalent energy per resource element.
28 . A base station for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
determine a synchronization signal block (SSB) configuration for an operating band associated with the base station, wherein the operating band has a maximum bandwidth that is narrower than a minimum SSB bandwidth for an access link; and
transmit an SSB based at least in part on the SSB configuration, wherein the SSB includes one or more punctured edges such that the SSB includes a set of resource blocks RBs) only in a frequency region that is within the maximum bandwidth of the operating band, and wherein RBs in the punctured edges are not transmitted by the base station.
29 . The base station of claim 28 ,
wherein the SSB includes a first set of resource blocks (RBs) that are transmitted in a first SSB occasion only in an upper frequency region that is within the maximum bandwidth of the operating band, and a second set of RBs that are transmitted in a second SSB occasion only in a lower frequency region that is within the maximum bandwidth of the operating band.
30 . The base station of claim 28 ,
wherein the SSB configuration is based at least in part on a sidelink SSB configuration requiring a minimum bandwidth that is narrower than the maximum bandwidth of the operating band.