Techniques for bandwidth part resource block offset hopping
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine that a first signal is associated with a New Radio Unlicensed (NR-U) Light configuration; determine a frequency hopping (FH) pattern and a set of FH channels for a second signal based at least in part on the determination that the first signal is associated with the NR-U Light configuration; and receive the second signal based at least in part on the FH pattern and the set of FH channels. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
determining that a first signal is associated with a New Radio Unlicensed (NR-U) Light configuration;
determining a frequency hopping (FH) pattern and a set of FH channels for a second signal based at least in part on the determination that the first signal is associated with the NR-U Light configuration,
wherein the set of FH channels are included within a bandwidth of a control resource set (CORESET) with index zero; and
receiving the second signal based at least in part on the FH pattern and the set of FH channels.
2. The method of claim 1 , wherein the first signal carries at least one of a master information block or a synchronization signal block and the second signal carries remaining minimum system information in the CORESET with index zero.
3. The method of claim 1 , wherein the determination that the first signal is associated with the NR-U Light configuration is based at least in part on at least one of:
the first signal being on a synchronization raster associated with the NR-U Light configuration,
a value in the first signal indicating that the first signal is associated with the NR-U Light configuration, or
one or more codepoints of a table associated with the CORESET with index zero that is associated with the first signal.
4. The method of claim 1 , wherein the set of FH channels is included within a wideband channel of a base station from which the first signal or the second signal is received.
5. The method of claim 1 , wherein an initial FH channel location of the FH pattern is based at least in part on a frequency location and a bandwidth of the CORESET with a zero index.
6. The method of claim 1 , wherein the FH pattern indicates that a first hop is performed after the first signal is received and before the second signal is received.
7. The method of claim 1 , wherein determining the FH pattern and the set of FH channels for the second signal comprises:
dividing a bandwidth of a base station that transmits the first signal into a plurality of contiguous channels, wherein the set of FH channels corresponds to the plurality of contiguous channels, and wherein the first signal indicates a number of the plurality of contiguous channels.
8. The method of claim 7 , wherein a CORESET indication of the first signal indicates the number of the plurality of contiguous channels and an FH channel offset that indicates a channel, of the plurality of contiguous channels, in which a synchronization signal block associated with the first signal is transmitted.
9. The method of claim 1 , wherein the bandwidth of the CORESET with index zero, corresponding to the first signal, includes a center of a channel of the set of FH channels, wherein a bandwidth of the channel of the set of FH channels is sufficiently wide to carry the CORESET with index zero, and wherein the CORESET with index zero is a first CORESET with index zero corresponding to the first signal, and wherein the CORESET with index zero indicates an FH channel index corresponding to the channel.
10. The method of claim 1 , wherein the FH pattern is determined based at least in part on at least one of timing information, a sub-band index associated with the first signal, or a cell identifier associated with the UE.
11. The method of claim 1 , wherein determining the FH pattern is based at least in part on receiving information, via the first signal, indicating at least one of one or more hops associated with the second signal or a pattern offset relative to a configured pattern.
12. The method of claim 1 , wherein a set of resource block (RB) offsets for a set of CORESETs with index zero, corresponding to the set of FH channels, is defined relative to an initial synchronization signal block (SSB) location of the first signal, wherein a particular CORESET with index zero is associated with a relative position, within an FH channel that includes the particular CORESET with index zero, that corresponds to a relative position of the initial SSB location of the first signal within another FH channel.
13. The method of claim 1 , wherein the CORESET is a wideband CORESET with index zero, and wherein the set of FH channels correspond to respective groups of control channel elements (CCEs).
14. The method of claim 13 , wherein, for a given hop identified by the FH pattern, a group of CCEs corresponding to an active FH channel are active, and wherein downlink control channel candidates are populated in the active group of CCEs.
15. The method of claim 14 , wherein the FH pattern is based at least in part on at least one of a system frame number, a half frame index, or a sub-band index of the given hop.
16. The method of claim 14 , wherein, for a common search space, the active group of CCEs for a given downlink control channel candidate is based at least in part on a number of CCEs associated with the wideband CORESET with index zero and an aggregation level of the given downlink control channel candidate.
17. The method of claim 13 , wherein the bandwidth of the wideband CORESET with index zero is included in an NR Unlicensed band, and wherein a channel gap is provided between two or more FH channels of the set of FH channels, based at least in part on a number of symbols of the wideband CORESET with index zero.
18. The method of claim 13 , wherein the first signal indicates the bandwidth of the wideband CORESET with index zero, and wherein the bandwidth of the wideband CORESET is equal to a number of the set of FH channels multiplied by a bandwidth of a single FH channel of the set of FH channels.
19. The method of claim 1 , wherein the FH pattern is a first FH pattern, wherein the second signal indicates a second FH pattern for a third signal, and wherein the method further comprises:
transmitting or receiving the third signal in accordance with the second FH pattern, wherein the second signal indicates a plurality of resource block (RB) offsets for a plurality of FH channels associated with the second FH pattern, and wherein the second FH pattern is based at least in part on a pseudo-random hopping pattern that uses the plurality of RB offsets.
20. A method of wireless communication performed by a base station, comprising:
transmitting a first signal that is associated with a New Radio Unlicensed (NR-U) Light configuration; and
transmitting a second signal based at least in part on a frequency hopping (FH) pattern and a set of FH channels for the second signal based at least in part on the first signal being associated with the NR-U Light configuration,
wherein the set of FH channels are included within a bandwidth of a control resource set (CORESET) with index zero.
21. The method of claim 20 , wherein the first signal carries at least one of a master information block or a synchronization signal block and the second signal carries remaining minimum system information in the CORESET with index zero.
22. The method of claim 20 , wherein the first signal indicates that the first signal is associated with the NR-U Light configuration based at least in part on at least one of:
the first signal being on a synchronization raster associated with the NR-U Light configuration,
a value in the first signal indicating that the first signal is associated with the NR-U Light configuration, or
one or more codepoints of a table associated with the CORESET with index zero that is associated with the first signal.
23. The method of claim 20 , wherein the set of FH channels is included within a wideband channel of the base station.
24. The method of claim 20 , wherein an initial FH channel location of the FH pattern is based at least in part on a frequency location and a bandwidth of the CORESET with index zero.
25. The method of claim 20 , wherein the FH pattern indicates that a first hop is performed after the first signal is received and before the second signal is received.
26. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
determine that a first signal is associated with a New Radio Unlicensed (NR-U) Light configuration;
determine a frequency hopping (FH) pattern and a set of FH channels for a second signal based at least in part on the determination that the first signal is associated with the NR-U Light configuration,
wherein the set of FH channels are included within a bandwidth of a control resource set (CORESET) with index zero; and
receive the second signal based at least in part on the FH pattern and the set of FH channels.
27. The UE of claim 26 , wherein the first signal carries at least one of a master information block or a synchronization signal block and the second signal carries remaining minimum system information in the CORESET with index zero.
28. The UE of claim 26 , wherein the determination that the first signal is associated with the NR-U Light configuration is based at least in part on at least one of:
the first signal being on a synchronization raster associated with the NR-U Light configuration,
a value in the first signal indicating that the first signal is associated with the NR-U Light configuration, or
one or more codepoints of a table associated with the CORESET with index zero that is associated with the first signal.
29. The UE of claim 26 , wherein the set of FH channels is included within a wideband channel of a base station from which the first signal or the second signal is received.
30. A base station for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the one or more processors configured to:
transmit a first signal that is associated with a New Radio Unlicensed (NR-U) Light configuration; and
transmit a second signal based at least in part on a frequency hopping (FH) pattern and a set of FH channels for the second signal based at least in part on the first signal being associated with the NR-U Light configuration,
wherein the set of FH channels are included within a bandwidth of a control resource set (CORESET) with index zero.