Capability Signaling for Multiple Timing Advances
A wireless device transmits a user equipment (UE) capability message comprising a first parameter, per band combination, indicating a maximum number of timing advance groups (TAGs) that the wireless device supports. The UE capability message further comprises a second parameter, per cell, indicating whether the wireless device supports two TAGs for intra-cell multiple transmission and reception point (multi-TRP) operation. The wireless device receives one or more radio resource control (RRC) messages two TAGs for a cell and a plurality of transmission configuration indicator (TCI) states for uplink transmissions via the cell. The wireless device receives downlink control information (DCI) indicating a TCI state associated with a TAG among the two TAGs of the cell. The wireless device transmits, based on a timing advance of the TAG associated with the TCI state, an uplink transmission using the TCI state.
1 . A method comprising:
transmitting, by a wireless device, a user equipment (UE) capability message comprising:
a first parameter, for each band combination in a plurality of band combinations, indicating a maximum number of timing advance groups (TAGs) that the wireless device supports for a plurality of cells in a respective band combination of the plurality of band combination; and
a second parameter, for each cell in the plurality of cells, indicating whether the wireless device supports two TAGs for intra-cell multiple transmission and reception point (multi-TRP) operation;
receiving one or more radio resource control (RRC) messages indicating:
a plurality of transmission configuration indicator (TCI) states for uplink transmissions via a cell; and
two TAGs for the cell;
receiving downlink control information (DCI) indicating a TCI state among the plurality of TCI states for the cell, wherein the TCI state is associated with a TAG among the two TAGs of the cell; and
transmitting, based on a timing advance of the TAG associated with the TCI state, an uplink transmission using the TCI state.
2 . The method of claim 1 , wherein:
the one or more RRC messages comprise one or more first configuration parameters for a cell group comprising the cell;
the one or more first configuration parameters comprise a plurality of TAG identifiers (IDs) indicating a plurality of TAGs; and
the plurality of TAGs comprise the two TAGs.
3 . The method of claim 2 , wherein:
the one or more RRC messages comprise one or more second configuration parameters for the cell in the cell group; and
the one or more second configuration parameters indicate:
the plurality of TCI states;
a first TAG ID, of the plurality of TAG IDs, indicating a first TAG of the two TAGs for the cell; and
a second TAG ID, of the plurality of TAG IDs, indicating a second TAG of the two TAGS for the cell.
4 . The method of claim 3 , wherein the one or more second configuration parameters indicate two control resource set (coreset) pool indexes for the cell.
5 . The method of claim 1 , wherein the uplink transmission is:
a physical uplink shared channel (PUSCH) transmission;
a physical uplink control channel (PUCCH) transmission; or
a sounding reference signal (SRS) transmission.
6 . The method of claim 1 , wherein the plurality of TC states comprise at least one of:
downlink-joint TCI states applicable to both uplink and downlink transmissions on the cell; or
uplink TCI states applicable to uplink transmissions on the cell.
7 . The method of claim 1 , wherein the DCI comprises a TCI field that indicates the TCI state.
8 . A method comprising:
receiving, by a base station from a wireless device, a user equipment (UE) capability message comprising:
a first parameter, for each band combination in a plurality of band combinations, indicating a maximum number of timing advance groups (TAGs) that the wireless device supports for a plurality of cells in a respective band combination of the plurality of band combination; and
a second parameter, for each cell in the plurality of cells, indicating whether the wireless device supports two TAGs for intra-cell multiple transmission and reception point (multi-TRP) operation;
transmitting, to the wireless device one or more radio resource control (RRC) messages indicating:
a plurality of transmission configuration indicator (TCI) states for uplink transmissions via a cell; and
two TAGs for the cell;
transmitting, to the wireless device, downlink control information (DCI) indicating a TCI state among the plurality of TC states for the cell, wherein the TCI state is associated with a TAG among the two TAGs of the cell; and
receiving, from the wireless device based on a timing advance of the TAG associated with the TCI state, an uplink transmission using the TCI state.
9 . The method of claim 8 , wherein:
the one or more RRC messages comprise one or more first configuration parameters for a cell group comprising the cell;
the one or more first configuration parameters comprise a plurality of TAG identifiers (IDs) indicating a plurality of TAGs; and
the plurality of TAGs comprise the two TAGs.
10 . The method of claim 9 , wherein:
the one or more RRC messages comprise one or more second configuration parameters for the cell in the cell group; and
the one or more second configuration parameters indicate:
the plurality of TCI states;
a first TAG ID, of the plurality of TAG IDs, indicating a first TAG of the two TAGs for the cell; and
a second TAG ID, of the plurality of TAG IDs, indicating a second TAG of the two TAGS for the cell.
11 . The method of claim 10 , wherein the one or more second configuration parameters indicate two control resource set (coreset) pool indexes for the cell.
12 . The method of claim 8 , wherein the uplink transmission is:
a physical uplink shared channel (PUSCH) transmission;
a physical uplink control channel (PUCCH) transmission; or
a sounding reference signal (SRS) transmission.
13 . The method of claim 8 , wherein the plurality of TCI states comprise at least one of:
downlink-joint TCI states applicable to both uplink and downlink transmissions on the cell; or
uplink TCI states applicable to uplink transmissions on the cell.
14 . The method of claim 8 , wherein the DCI comprises a TCI field that indicates the TCI state.
15 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a base station, cause the base station to:
receive, from a wireless device, a user equipment (UE) capability message comprising:
a first parameter, for each band combination in a plurality of band combinations, indicating a maximum number of timing advance groups (TAGs) that the wireless device supports for a plurality of cells in a respective band combination of the plurality of band combination; and
a second parameter, for each cell in the plurality of cells, indicating whether the wireless device supports two TAGs for intra-cell multiple transmission and reception point (multi-TRP) operation;
transmit, to the wireless device one or more radio resource control (RRC) messages indicating:
a plurality of transmission configuration indicator (TCI) states for uplink transmissions via a cell; and
two TAGs for the cell;
transmit, to the wireless device, downlink control information (DCI) indicating a TCI state among the plurality of TCI states for the cell, wherein the TCI state is associated with a TAG among the two TAGs of the cell; and
receive, from the wireless device based on a timing advance of the TAG associated with the TCI state, an uplink transmission using the TCI state.
16 . The base station of claim 15 , wherein:
the one or more RRC messages comprise one or more first configuration parameters for a cell group comprising the cell; and
the one or more first configuration parameters comprise a plurality of TAG identifiers (IDs) indicating a plurality of TAGs; and
the plurality of TAGs comprise the two TAGs.
17 . The base station of claim 16 , wherein:
the one or more RRC messages comprise one or more second configuration parameters for the cell in the cell group;
the one or more second configuration parameters indicate:
the plurality of TCI states;
a first TAG ID, of the plurality of TAG IDs, indicating a first TAG of the two TAGs for the cell; and
a second TAG ID, of the plurality of TAG IDs, indicating a second TAG of the two TAGS for the cell.
18 . The base station of claim 17 , wherein the one or more second configuration parameters indicate two control resource set (coreset) pool indexes for the cell.
19 . The base station of claim 15 , wherein the uplink transmission is:
a physical uplink shared channel (PUSCH) transmission;
a physical uplink control channel (PUCCH) transmission; or
a sounding reference signal (SRS) transmission.
20 . The base station of claim 15 , wherein the plurality of TCI states comprise at least one of:
downlink-joint TCI states applicable to both uplink and downlink transmissions on the cell; or
uplink TCI states applicable to uplink transmissions on the cell.