Method and apparatus for determining timing advance value
Embodiments of the present application are related to a method and apparatus for determining timing advance value. According an embodiment of the present application, an exemplary method includes: receiving association information between timing advance (TA) value for uplink transmission and downlink reference signal (RS), wherein each TA value is associated with an index of at least one corresponding downlink RS; determining a downlink RS index for associating with a TA value for uplink transmission; and determining the TA value for uplink transmission based on the association information. Accordingly, embodiments of the present application can indicate and determine TA value with reduced signaling overhead.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and operable to cause the UE to:
receive first signaling that indicates association information between a plurality of timing advance (TA) values for an uplink transmission and a plurality of downlink reference signals (RSs), wherein each TA value of the plurality of TA values is associated with at least one downlink RS index corresponding to at least one downlink RS of the plurality of downlink RSs;
receive second signaling comprising at least one parameter corresponding to a downlink RS of the plurality of downlink RSs;
determine, based at least in part on a configuration between values of the at least one parameter and respective downlink RS indices associated with the plurality of downlink RSs, a downlink RS index associated with the downlink RS, wherein the at least one parameter is different from the downlink RS index; and
determine a TA value of the plurality of TA values for the uplink transmission based at least in part on the downlink RS index and the association information.
2 . The UE of claim 1 , wherein the downlink RS index comprises at least one of an index of a single RS or a group index of a RS group.
3 . The UE of claim 1 , wherein the downlink RS comprises a synchronization signal block (SSB) or a channel state information-reference signal (CSI-RS) resource.
4 . The UE of claim 3 , wherein the association information is between the plurality of TA values and a plurality of CSI-RS resources, and wherein the first signaling comprises at least one of radio resource control (RRC) signaling or a medium access control (MAC) control element (CE).
5 . The UE of claim 3 , wherein the association information is between the plurality of TA values and a plurality of SSBs, and wherein the first signaling comprises at least one of a system information block (SIB), radio resource control (RRC) signaling, or a medium access control (MAC) control element (CE).
6 . The UE of claim 1 , wherein the association information is configured per cell, and wherein the at least one processor is further operable to cause the UE to:
determine, based at least in part on the downlink RS being configured with a component carrier (CC) index, the association information based at least in part on a CC indicated by the CC index; or
determine the association information based at least in part on a default CC index.
7 . The UE of claim 1 , wherein to determine the downlink RS index, the at least one processor is operable to cause the UE to select a synchronization signal block (SSB) from a plurality of SSBs based at least in part on a radio resource measurement (RRM), wherein an index of the SSB comprises the downlink RS index.
8 . The UE of claim 7 , wherein the at least one processor is further operable to cause the UE to transmit, on a physical random access channel/random access channel (PRACH/RACH) occasion (RO) associated with the SSB, a Msg1 or MsgA that indicates the TA value.
9 . The UE of claim 1 , wherein the at least one parameter comprises a sounding reference signal (SRS) resource indicator (SRI), and wherein the at least one processor is further operable to cause the UE to determine, based at least in part on the SRI, a pathloss reference RS identifier, wherein the downlink RS index is based at least in part on the pathloss reference RS identifier.
10 . The UE of claim 9 , wherein the second signaling comprises a downlink control information (DCI).
11 . The UE of claim 1 , wherein the second signaling comprises one or more of radio resource control (RRC) signaling or medium access control (MAC) control element (CE), and wherein the at least one parameter comprises a pathloss reference RS identifier associated with a sounding reference signal (SRS) resource set.
12 . The UE of claim 1 , wherein the second signaling comprises at least one of radio resource control (RRC) signaling or a medium access control (MAC) control element (CE), and wherein the at least one parameter comprises at least one of a pathloss reference RS identifier associated with a physical uplink control channel (PUCCH) resource or spatial relation information associated with the PUCCH resource.
13 . The UE of claim 12 , wherein to determine the downlink RS index, the at least one processor is operable to cause the UE to one or more of:
locate, based at least in part on the downlink RS being configured with a component carrier (CC) index, the downlink RS in a CC indicated by the CC index; or
locate the downlink RS in a default CC, wherein the default CC is one or more of a first activated CC or a second activated CC for physical downlink control channel (PDCCH) reception.
14 . The UE of claim 12 , wherein to determine the downlink RS index, the at least one processor is operable to cause the UE to one or more of:
locate, based at least in part on the downlink RS being configured with a bandwidth part (BWP) index, the downlink RS in a BWP indicated by the BWP index; or
locate the downlink RS in a default BWP, wherein the default BWP is an activated downlink BWP.
15 . The UE of claim 1 , wherein the downlink RS index is based at least in part on a transmission configuration indication (TCI) state of a control resource set (CORESET) associated with one or more physical downlink control channels (PDCCHs) scheduling a physical uplink shared channel (PUSCH) or triggering physical uplink control channel (PUCCH) feedback, wherein:
the uplink transmission is scheduled or triggered by the one or more PDCCHs;
the downlink RS index is associated with quasi co-location (QCL) TypeD of two or more downlink RSs based at least in part on the two or more downlink RSs being associated with the TCI state; and
the downlink RS index is associated with one downlink RS based at least in part on the one downlink RS being associated with the TCI state.
16 . The UE of claim 1 , wherein the at least one processor is further operable to cause the UE to determine, based at least in part on no information for updating the TA value being received, the TA value by a latest TA value, wherein the latest TA value corresponds to at least one of a latest uplink transmission or a latest downlink control information (DCI).
17 . The UE of claim 1 , wherein the at least one processor is further operable to cause the UE to determine, based at least in part on a plurality of uplink transmissions being associated with different TA values, the TA value by the uplink transmission with a highest priority of the plurality of uplink transmissions or by a default TA value, and wherein one or more of:
the plurality of uplink transmissions have overlapping time domain resources;
respective priorities of the plurality of uplink transmissions are one or more of predefined or configured by RRC signaling;
the respective priorities of the plurality of uplink transmissions are based at least in part on a first time domain starting position of the uplink transmission;
the uplink transmission is associated with a greatest time domain starting position of the plurality of uplink transmissions;
the uplink transmission is associated with a smallest time domain starting position of the plurality of uplink transmissions;
the respective priorities of the plurality of uplink transmissions are based at least in part on a second time domain starting position of a downlink control information (DCI) scheduling or triggering the uplink transmission;
the uplink transmission is scheduled or triggered by a latest DCI; or
the default TA value is configured by radio resource control (RRC) signaling.
18 . A network equipment (NE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and operable to cause the NE to:
transmit first signaling that indicates association information between a plurality of timing advance (TA) values for an uplink transmission and a plurality of downlink reference signals (RSS), wherein each TA value of the plurality of TA values is associated with at least one downlink RS index corresponding to at least one downlink RS of the plurality of downlink RSs;
transmit second signaling comprising at least one parameter corresponding to a downlink RS of the plurality of downlink RSs;
determine, based at least in part on a configuration between values of the at least one parameter and respective downlink RS indices associated with the plurality of downlink RSs, a downlink RS index associated with the downlink RS, wherein the at least one parameter is different from the downlink RS index; and
determine a TA value of the plurality of TA values for the uplink transmission based at least in part on the downlink RS index and the association information.
19 . A method performed by a user equipment (UE), the method comprising:
receiving first signaling that indicates association information between a plurality of timing advance (TA) values for an uplink transmission and a plurality of downlink reference signals (RSs), wherein each TA value of the plurality of TA values is associated with at least one downlink RS index corresponding to at least one downlink RS of the plurality of downlink RSs;
receiving second signaling comprising at least one parameter corresponding to a downlink RS of the plurality of downlink RSs;
determining, based at least in part on a configuration between values of the at least one parameter and respective downlink RS indices associated with the plurality of downlink RSs, a downlink RS index associated with the downlink RS, wherein the at least one parameter is different from the downlink RS index; and
determining a TA value of the plurality of TA values for the uplink transmission based at least in part on the downlink RS index and the association information.
20 . A method performed by a network equipment (NE), the method comprising:
transmitting first signaling that indicates association information between a plurality of timing advance (TA) values for an uplink transmission and a plurality of downlink reference signals (RSs), wherein each TA value of the plurality of TA values is associated with at least one downlink RS index corresponding to at least one downlink RS of the plurality of downlink RSs;
transmitting second signaling comprising at least one parameter corresponding to a downlink RS of the plurality of downlink RSs;
determining, based at least in part on a configuration between values of the at least one parameter and respective downlink RS indices associated with the plurality of downlink RSs, a downlink RS index associated with the downlink RS, wherein the at least one parameter is different from the downlink RS index; and
determining a TA value of the plurality of TA values for the uplink transmission based at least in part on the downlink RS index and the association information.