Method and apparatus for determining active bandwidth part
Embodiments of the present application are related to a method and apparatus for determining active bandwidth part (BWP). According an embodiment of the present application, an exemplary method includes: receiving first configuration information indicating association between BWP and reference signal (RS); determining a first RS, which is indicated by second configuration information, or user equipment (UE) selected, or predefined in specification(s); and determining an active BWP based on the first RS and the association between BWP and RS.
1 . A method performed by an apparatus, the method comprising:
receiving first configuration information indicating an association between a bandwidth part (BWP) and a reference signal (RS);
determining a first RS, which is indicated by second configuration information, is user equipment (UE) selected, or is predefined in one or more specifications,
wherein the first RS is a synchronization signal block (SSB) indicated by a physical downlink control channel (PDCCH) order; and
determining an active BWP based on the first RS and the association between the BWP and the RS,
wherein the association between the BWP and the RS indicates an association between the active BWP and the SSB.
2 . The method of claim 1 , wherein the first RS is at least one aperiodic sounding reference signal (SRS) triggered by downlink control information (DCI).
3 . The method of claim 2 , wherein the first RS is associated with channel state information (CSI)-RS, and the association between the BWP and the RS indicates the association between the active BWP and the CSI-RS.
4 . The method of claim 2 , further comprising: determining a time domain offset between the DCI and transmission of the at least one aperiodic SRS based on a subcarrier spacing (SCS) of the active BWP.
5 . The method of claim 2 , wherein a minimal time interval between a last symbol of a physical downlink control channel (PDCCH) including the DCI and a first symbol of a first SRS of the at least one aperiodic SRS is determined based on a subcarrier spacing (SCS) of the active BWP.
6 . The method of claim 2 , wherein the association between the BWP and the RS indicates the association between the active BWP and the first RS.
7 . The method of claim 1 , further comprising: transmitting at least one of Msg 1, Msg 3, and a physical uplink control channel (PUCCH) on the active BWP when the active BWP is an uplink BWP.
8 . The method of claim 1 , further comprising: monitoring physical downlink control channel (PDCCH) and corresponding physical downlink shared channel (PDSCH) scheduled by the PDCCH on the active BWP when the active BWP is a downlink BWP.
9 . The method of claim 1 , wherein the first RS is a UE selected synchronization signal block (SSB) for determining a random access channel (RACH) occasion (RO) for a physical random access channel (PRACH) transmission, and the association between the BWP and the RS indicates the association between the active BWP and the UE selected SSB.
10 . The method of claim 9 , further comprising: determining whether the active BWP is an uplink BWP for PRACH transmission based on whether there is a RACH resource configuration on the active BWP.
11 . The method of claim 10 , further comprising: when there is RACH resource configuration, transmitting the PRACH transmission on the active BWP as an uplink BWP; and when there is no RACH resource configuration, transmitting the PRACH transmission on a common uplink BWP different from the active BWP.
12 . The method of claim 1 , wherein the first RS is associated with a candidate RS during a backhaul failure recovery (BFR) procedure.
13 . The method of claim 12 , wherein the candidate RS is a channel state information (CSI)-RS or a synchronization signal block (SSB), and the association between the BWP and the RS indicates the association between the active BWP and the CSI-RS or the SSB.
14 . The method of claim 13 , further comprising: transmitting at least one of physical random access channel (PRACH), physical uplink shared channel (PUSCH), and physical uplink control channel (PUCCH) on the active BWP of when the active BWP is an uplink BWP.
15 . An apparatus for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the apparatus to:
receive first configuration information indicating an association between a bandwidth part (BWP) and a reference signal (RS);
determine a first RS, which is indicated by second configuration information, is user equipment (UE) selected, or is predefined in one or more specifications,
wherein the first RS is a synchronization signal block (SSB) indicated by a physical downlink control channel (PDCCH) order; and
determine an active BWP based on the first RS and the association between the BWP and the RS,
wherein the association between the BWP and the RS indicates an association between the active BWP and the SSB.
16 . The apparatus of claim 15 , wherein the first RS is at least one aperiodic sounding reference signal (SRS) triggered by downlink control information (DCI).
17 . An apparatus for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the apparatus to:
receive first configuration information indicating an association between a bandwidth part (BWP) and a reference signal (RS);
determine a first RS, which is indicated by second configuration information, is user equipment (UE) selected, or is predefined in one or more specifications;
determine an active BWP based on the first RS and the association between the BWP and the RS,
wherein the first RS is a synchronization signal block (SSB) for determining a random access channel (RACH) occasion (RO) for a physical random access channel (PRACH) transmission, and the association between the BWP and the RS indicates the association between the active BWP and the SSB.
18 . An apparatus for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the apparatus to:
receive first configuration information indicating an association between a bandwidth part (BWP) and a reference signal (RS);
determine a first RS, which is indicated by second configuration information, is user equipment (UE) selected, or is predefined in one or more specifications;
determine an active BWP based on the first RS and the association between the BWP and the RS,
wherein the first RS is associated with a candidate RS during a backhaul failure recovery (BFR) procedure.
19 . The apparatus of claim 18 , wherein the candidate RS is a channel state information (CSI)-RS or a synchronization signal block (SSB), and the association between the BWP and the RS indicates the association between the active BWP and the CSI-RS or the SSB.
20 . The apparatus of claim 18 , wherein the at least one processor is further configured to cause the apparatus to: transmit at least one of physical random access channel (PRACH), physical uplink shared channel (PUSCH), and physical uplink control channel (PUCCH) on the active BWP when the active BWP is an uplink BWP.