Common beam indication based on link selection
A wireless device receives a medium access control control element (MAC CE) indicating activation of a transmission configuration indicator (TCI) state. The MAC CE comprises a TCI state identifier (ID) of the TCI state and a link indicator. A first value of the link indicator indicates that the TCI state ID is from a first list of one or more first TCI state IDs for downlink, and a second value of the link indicator indicates that the TCI state ID is from a second list of one or more second TCI state IDs for uplink. The wireless device communicates, with a base station, based on the TCI state indicated by the TCI state ID and the link indicator.
1. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive a medium access control control element (MAC CE) indicating activation of one or more transmission configuration indicator (TCI), states comprising a first TCI state, wherein the MAC CE comprises:
a first TCI state identifier (ID) of the first TCI state; and
a link indicator, wherein:
a first value of the link indicator indicates that the first TCI state ID is from a first list of one or more first TCI state IDs for downlink; and
a second value of the link indicator indicates that the first TCI state ID is from a second list of one or more second TCI state IDs for uplink; and
communicate, with a base station, based on the first TCI state indicated by the first TCI state ID and the link indicator.
2. The wireless device of claim 1 , wherein the instructions further cause the wireless device to activate the first TCI state in response to receiving the MAC CE indicating the activation of the first TCI state.
3. The wireless device of claim 1 , wherein the instructions further cause the wireless device to receive a downlink control information (DCI) comprising a TCI field, wherein a codepoint of the TCI field indicates the first TCI state ID.
4. The wireless device of claim 3 , wherein the wireless device communicates with the base station based on the first TCI state, wherein the first TCI state is indicated by the first TCI state ID corresponding to the codepoint of the TCI field of the DCI.
5. The wireless device of claim 1 , wherein the instructions further cause the wireless device to receive one or more radio resource control (RRC) messages comprising configuration parameters of:
a first list of one or more first TCI states for downlink, each of the one or more first TCI states in the first list being associated with a corresponding TCI state ID of the first list of one or more first TCI state IDs; and
a second list of one or more second TCI states for uplink, each of the one or more second TCI states in the second list being associated with a corresponding TCI state ID of the second list of one or more second TCI state IDs.
6. The wireless device of claim 5 , wherein the configuration parameters indicate, for each TCI of the first list of one or more first TCI states or the second list of one or more second TCI states:
a cell index;
a bandwidth part index;
a reference signal (RS) index indicating at least one of a channel state information reference signal (CSI-RS) index or a synchronization signal block (SSB) index; and
a quasi-colocation type indicator.
7. The wireless device of claim 1 , wherein:
the communicating with the base station based on the first TCI state comprises, in response to the link indicator being set to the first value, receiving downlink signals and channels using a spatial domain filter determined based on the activated TCI state; and
the downlink signals and channels comprise at least one of:
a physical downlink shared channel (PDSCH);
a physical downlink control channel (PDCCH); or
a channel state information reference signal (CSI-RS).
8. The wireless device of claim 1 , wherein:
the communicating with the base station based on the first TCI state comprises, in response to the link indicator being set to the second value, transmitting uplink signals and channels using a spatial domain filter determined based on the activated TCI state; and
the uplink signals and channels comprise at least one of:
a physical uplink shared channel (PUSCH);
a physical uplink control channel (PUCCH); or
a sounding reference signal (SRS).
9. A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the base station to:
transmit, to a wireless device, a medium access control control element (MAC CE) indicating activation of one or more transmission configuration indicator (TCI), states comprising a first TCI state, wherein the MAC CE comprises:
a first TCI state identifier (ID) of the first TCI state; and
a link indicator, wherein:
a first value of the link indicator indicates that the first TCI state ID is from a first list of one or more first TCI state IDs for downlink; and
a second value of the link indicator indicates that the first TCI state ID is from a second list of one or more second TCI state IDs for uplink; and
communicate, with the wireless device, based on the first TCI state indicated by the first TCI state ID and the link indicator.
10. The base station of claim 9 , wherein the instructions further cause the base station to activate the first TCI state in response to transmitting the MAC CE indicating the activation of the first TCI state.
11. The base station of claim 9 , wherein the instructions further cause the base station to transmit a downlink control information (DCI) comprising a TCI field, wherein a codepoint of the TCI field indicates the first TCI state ID.
12. The base station of claim 11 , wherein the base station communicates with the base station based on the first TCI state, wherein the TCI state is indicated by the first TCI state ID corresponding to the codepoint of the TCI field of the DCI.
13. The base station of claim 9 , wherein the instructions further cause the base station to transmit one or more radio resource control (RRC) messages comprising configuration parameters of:
a first list of one or more first TCI states for downlink, each of the one or more first TCI states in the first list being associated with a corresponding TCI state ID of the first list of one or more first TCI state IDs; and
a second list of one or more second TCI states for uplink, each of the one or more second TCI states in the second list being associated with a corresponding TCI state ID of the second list of one or more second TCI state IDs.
14. The base station of claim 13 , wherein the configuration parameters indicate, for each TCI of the first list of one or more first TCI states or the second list of one or more second TCI states:
a cell index;
a bandwidth part index;
a reference signal (RS) index indicating at least one of a channel state information reference signal (CSI-RS) index or a synchronization signal block (SSB) index; and
a quasi-colocation type indicator.
15. The base station of claim 9 , wherein:
the communicating with the wireless device based on the first TCI state comprises, in response to the link indicator being set to the first value, transmitting downlink signals and channels using a spatial domain filter determined based on the activated TCI state; and
the downlink signals and channels comprise at least one of:
a physical downlink shared channel (PDSCH);
a physical downlink control channel (PDCCH); or
a channel state information reference signal (CSI-RS).
16. The base station of claim 9 , wherein:
the communicating with the wireless device based on the first TCI state comprises, in response to the link indicator being set to the second value, receiving uplink signals and channels using a spatial domain filter determined based on the activated TCI state; and
the uplink signals and channels comprise at least one of:
a physical uplink shared channel (PUSCH);
a physical uplink control channel (PUCCH); or
a sounding reference signal (SRS).
17. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive a medium access control control element (MAC CE) indicating activation of one or more transmission configuration indicator (TCI), states comprising a first TCI state, wherein the MAC CE comprises:
a first TCI state identifier (ID) of the first TCI state; and
a link indicator, wherein:
a first value of the link indicator indicates that the first TCI state ID is from a first list of one or more first TCI state IDs for downlink; and
second value of the link indicator indicates that the first TCI state ID is from a second list of one or more second TCI state IDs for uplink; and
communicate, with a base station, based on the first TCI state indicated by the first TCI state ID and the link indicator.
18. The non-transitory computer-readable medium of claim 17 , wherein the instructions further cause the wireless device to activate the first TCI state in response to receiving the MAC CE indicating the activation of the first TCI state.
19. The non-transitory computer-readable medium of claim 17 , wherein the instructions further cause the wireless device to receive a downlink control information (DCI) comprising a TCI field, wherein a codepoint of the TCI field indicates the first TCI state ID.
20. The non-transitory computer-readable medium of claim 19 , wherein the wireless device communicates with the base station based on the first TCI state, wherein the first TCI state is indicated by the TCI state ID corresponding to the codepoint of the TCI field of the DCI.