Beam activation and determination in wireless networks
Beam determination and beam activation may be used in wireless communications. An initial (e.g., default) TCI state pool, of a plurality of TCI state pools, may be used to receive one or more messages indicating a second TCI state pool for communicating signals between a wireless device and a base station. The one or more messages may comprise an indication of a TCI state pair (e.g., an uplink TCI state and a downlink TCI state) of the second TCI state pool.
1. A method comprising:
receiving, by a wireless device, configuration parameters of a plurality of transmission configuration indicator (TCI) state lists comprising a downlink TCI state list and an uplink TCI state list;
receiving a medium access control control element (MAC CE) activating a plurality of TCI states mapped to one or more TCI codepoints, wherein a TCI codepoint, of the one or more TCI codepoints, indicates a TCI state pair comprising a downlink TCI state of the downlink TCI state list and an uplink TCI state of the uplink TCI state list;
receiving downlink control information (DCI) indicating the TCI codepoint;
receiving, based on the downlink TCI state, at least one downlink signal; and
sending, based on the uplink TCI state, at least one uplink signal.
2. The method of claim 1 , wherein the plurality of TCI state lists are associated with a plurality of cells, wherein the method further comprises:
determining, for a cell of the plurality of cells and based on the configuration parameters, a first TCI state list, as a default TCI state list, from the plurality of TCI state lists; and
receiving, based on the default TCI state list, one or more downlink signals via the cell.
3. The method of claim 2 , wherein the configuration parameters indicate a priority value for each of the plurality of TCI state lists, and wherein the determining the first TCI state list comprises:
determining the first TCI state list, from the plurality of TCI state lists, based on the priority value of the first TCI state list.
4. The method of claim 1 , wherein the plurality of TCI state lists comprise one or more common TCI state lists, and wherein each TCI state of the one or more common TCI state lists is configured for at least one of:
transmission of multiple uplink signals; or
reception of multiple downlink signals.
5. The method of claim 1 , wherein the at least one uplink signal comprises at least one of:
a physical uplink control channel (PUCCH) transmission;
a physical uplink shared channel (PUSCH) transmission;
a physical random access channel (PRACH) transmission; or
a sounding reference signal (SRS) transmission.
6. The method of claim 1 , wherein the at least one downlink signal comprises at least one of:
a physical downlink control channel (PDCCH) transmission;
a physical downlink shared channel (PDSCH) transmission;
a synchronization signal block (SSB) transmission; or
a channel state information reference signal (CSI-RS) transmission.
7. The method of claim 1 , wherein:
the MAC CE comprises a first field indicating a plurality of second TCI state lists, of the plurality of TCI state lists, wherein the plurality of TCI state lists comprise a downlink TCI state list and an uplink TCI state list; and
the MAC CE comprises a second field activating the TCI states comprising the TCI state pair.
8. The method of claim 7 , wherein the downlink TCI state list comprises the downlink TCI state, and wherein the uplink TCI state list comprises the uplink TCI state.
9. The method of claim 1 , wherein the DCI further comprises a bitfield, and wherein the bitfield comprises a codepoint indicating a TCI state list of the plurality of TCI state lists.
10. The method of claim 1 , wherein the DCI further comprises a bitfield, and wherein the TCI codepoint corresponds to a value of the bitfield.
11. The method of claim 1 , wherein the downlink TCI state and the uplink TCI state are associated with a same TCI index.
12. A method comprising:
receiving, by a wireless device, configuration parameters of a plurality of transmission configuration indicator (TCI) state lists for a plurality of cells, wherein each of the plurality of TCI state lists comprises one or more TCI states;
determining, for a cell of the plurality of cells and based on the configuration parameters, a first TCI state list, as a default TCI state list, from the plurality of TCI state lists; and
receiving, based on the default TCI state list, at least one downlink signal via the cell.
13. The method of claim 12 , wherein the at least one downlink signal comprises downlink control information (DCI), and wherein the DCI indicates a TCI codepoint indicating a TCI state pair comprising a downlink TCI state of the one or more TCI states and an uplink TCI state of the one or more TCI states, wherein the method further comprises:
sending, based on the uplink TCI state, at least one uplink signal.
14. The method of claim 12 , further comprising sending one or more uplink signals based on the default TCI state list.
15. The method of claim 12 , wherein the configuration parameters indicate a priority value for each of the plurality of TCI state lists, and wherein the determining the first TCI state list comprises:
determining the first TCI state list, from the plurality of TCI state lists, based on the priority value of the first TCI state list.
16. The method of claim 12 , wherein the determining the first TCI state list comprises a determination that the configuration parameters indicate the first TCI state list as the default TCI state list of the cell of the plurality of cells.
17. The method of claim 12 , wherein the configuration parameters indicate a priority value for at least one of the plurality of TCI state lists, and wherein the determining the first TCI state list comprises:
determining the first TCI state list, from the plurality of TCI state lists, based on the priority value of the first TCI state list.
18. A method comprising:
sending, by a base station, configuration parameters of a plurality of transmission configuration indicator (TCI) state lists comprising a downlink TCI state list and an uplink TCI state list;
sending a medium access control control element (MAC CE) activating a plurality of TCI states mapped to one of more TCI codepoints, wherein a TCI code point, of the one or more TCI codepoints, indicates a TCI state pair comprising a downlink TCI state of the downlink TCI state list and an uplink TCI state of the uplink TCI state list;
sending downlink control information (DCI) indicating of the TCI codepoint;
sending, based on the downlink TCI state, at least one downlink signal; and
receiving, based on the uplink TCI state, at least one uplink signal.
19. The method of claim 18 , wherein the plurality of TCI state lists are associated with a plurality of cells, wherein the method further comprises:
sending, based on a default TCI state list, at least one downlink signal.
20. The method of claim 18 , wherein the DCI further comprises a bitfield, and wherein the TCI codepoint corresponds to a value of the bitfield.
21. The method of claim 18 , wherein the plurality of TCI state lists comprise one or more common TCI state lists, and wherein each TCI state of the one or more common TCI state lists is configured for at least one of:
reception of multiple uplink signals; or
transmission of multiple downlink signals.