Method and device for indicating SCS of initial downlink BWP
A method for indicating SubCarrier Spacing (SCS) of an initial downlink Bandwidth Part (BWP) is provided. The method includes: determining, by a terminal, SCS of an initial downlink BWP based on at least one of the following: a frequency position in which a Synchronization Signal and PBCH Block (SSB) is located, a synchronization raster number of the SSB, a first frequency band in which an operating carrier of the SSB is located, SCS of the SSB, or indication of target signaling.
1 . A method for indicating SubCarrier Spacing (SCS) of an initial downlink Bandwidth Part (BWP), comprising:
determining, by a terminal, SCS of an initial downlink BWP based on at least one of the following:
a frequency position in which a Synchronization Signal and PBCH Block (SSB) is located,
a synchronization raster number of the SSB,
a first frequency band in which an operating carrier of the SSB is located,
SCS of the SSB, or
indication of target signaling; and
performing transmission of a channel or a signal in the initial downlink BWP based on the determined SCS of the initial downlink BWP,
wherein the determining SCS of an initial downlink BWP comprises one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP,
determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling, or
determining the SCS of the initial downlink BWP based on the indication of the target signaling,
wherein the determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling comprises at least one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP when the SCS of the SSB is first target SCS; or
determining the SCS of the initial downlink BWP based on the indication of the target signaling when the SCS of the SSB is second target SCS.
2 . The method according to claim 1 , wherein
the using the SCS of the SSB as the SCS of the initial downlink BWP comprises using the SCS of the SSB as the SCS of the initial downlink BWP when the SCS of the SSB is third target SCS; or
the determining the SCS of the initial downlink BWP based on the indication of the target signaling comprises determining the SCS of the initial downlink BWP based on the indication of the target signaling when the SCS of the SSB is fourth target SCS.
3 . The method according to claim 1 , wherein the target signaling comprises an indication field, wherein:
the indication field is used to indicate target information when the SCS of the SSB is fifth target SCS, or
the indication field is used to indicate the SCS of the initial downlink BWP when the SCS of the SSB is sixth target SCS.
4 . The method according to claim 1 , wherein the target signaling comprises a target indication field that is used to indicate the SCS of the initial downlink BWP, wherein:
the target indication field is a common subcarrier spacing (subCarrierSpacingCommon) indication field, or
the target indication field comprises a first indication field and a second indication field, and the first indication field is the common subcarrier spacing (subCarrierSpacingCommon) indication field.
5 . The method according to claim 4 , wherein the second indication field comprises at least one of the following:
a Physical Downlink Shared Channel-Demodulation Reference Signal (PDSCH-DMRS) position indication field in the SSB,
a physical downlink control channel configuration system information block indication field in the SSB,
an SSB-subcarrier offset indication field in the SSB, or
a reserved field in the SSB.
6 . The method according to claim 5 , wherein the second indication field comprises the PDSCH-DMRS position indication field, wherein:
the PDSCH-DMRS position indication field has an association relationship with the SCS of the SSB, or
the PDSCH-DMRS position indication field is used to indicate a fixed PDSCH-DMRS position and has no association relationship with the SCS of the SSB.
7 . The method according to claim 5 , wherein the second indication field comprises the physical downlink control channel configuration system information block indication field, wherein
a quantity of valid licenses in a configuration table corresponding to a Control Resource Set (CORESET) indicated by the physical downlink control channel configuration system information block indication field is smaller than a first threshold, or
a quantity of valid licenses in a configuration table corresponding to a search space indicated by the physical downlink control channel configuration system information block indication field is smaller than a second threshold.
8 . The method according to claim 5 , wherein the second indication field comprises the SSB-subcarrier offset indication field, wherein
the SSB-subcarrier offset indication field comprises an indication bit that is used to indicate the SCS of the initial downlink BWP.
9 . The method according to claim 1 , wherein the first frequency band comprises one of the following:
a specified frequency range; or
a specified frequency band in the specified frequency range.
10 . A terminal, comprising: a processor; a memory having a computer program or an instruction stored thereon, wherein the computer program or the instruction, when executed by the processor, causes the processor to perform operations, comprising:
determining SubCarrier Spacing (SCS) of an initial downlink Bandwidth Part (BWP) based on at least one of the following:
a frequency position in which a Synchronization Signal and PBCH Block (SSB) is located,
a synchronization raster number of the SSB,
a first frequency band in which an operating carrier of the SSB is located,
SCS of the SSB, or
indication of target signaling; and
performing transmission of a channel or a signal in the initial downlink BWP based on the determined SCS of the initial downlink BWP,
wherein the determining SCS of an initial downlink BWP comprises one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP,
determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling, or
determining the SCS of the initial downlink BWP based on the indication of the target signaling,
wherein the determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling comprises at least one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP when the SCS of the SSB is first target SCS; or
determining the SCS of the initial downlink BWP based on the indication of the target signaling when the SCS of the SSB is second target SCS.
11 . The terminal according to claim 10 , wherein
the using the SCS of the SSB as the SCS of the initial downlink BWP comprises using the SCS of the SSB as the SCS of the initial downlink BWP when the SCS of the SSB is third target SCS; or
the determining the SCS of the initial downlink BWP based on the indication of the target signaling comprises determining the SCS of the initial downlink BWP based on the indication of the target signaling when the SCS of the SSB is fourth target SCS.
12 . The terminal according to claim 10 , wherein the target signaling comprises an indication field, wherein:
the indication field is used to indicate target information when the SCS of the SSB is fifth target SCS, or
the indication field is used to indicate the SCS of the initial downlink BWP when the SCS of the SSB is sixth target SCS.
13 . The terminal according to claim 10 , wherein the target signaling comprises a target indication field that is used to indicate the SCS of the initial downlink BWP, wherein:
the target indication field is a common subcarrier spacing (subCarrierSpacingCommon) indication field, or
the target indication field comprises a first indication field and a second indication field, and the first indication field is the common subcarrier spacing (subCarrierSpacingCommon) indication field.
14 . The terminal according to claim 13 , wherein the second indication field comprises at least one of the following:
a Physical Downlink Shared Channel-Demodulation Reference Signal (PDSCH-DMRS) position indication field in the SSB,
a physical downlink control channel configuration system information block indication field in the SSB,
an SSB-subcarrier offset indication field in the SSB, or
a reserved field in the SSB.
15 . A non-transitory computer-readable storage medium storing a computer program or an instruction that, when executed by a processor, causes the processor to perform operations, comprising:
determining SubCarrier Spacing (SCS) of an initial downlink Bandwidth Part (BWP) based on at least one of the following:
a frequency position in which a Synchronization Signal and PBCH Block (SSB) is located,
a synchronization raster number of the SSB,
a first frequency band in which an operating carrier of the SSB is located,
SCS of the SSB, or
indication of target signaling; and
performing transmission of a channel or a signal in the initial downlink BWP based on the determined SCS of the initial downlink BWP,
wherein the determining SCS of an initial downlink BWP comprises one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP,
determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling, or
determining the SCS of the initial downlink BWP based on the indication of the target signaling,
wherein the determining the SCS of the initial downlink BWP based on the SCS of the SSB and the indication of the target signaling comprises at least one of the following:
using the SCS of the SSB as the SCS of the initial downlink BWP when the SCS of the SSB is first target SCS; or
determining the SCS of the initial downlink BWP based on the indication of the target signaling when the SCS of the SSB is second target SCS.