Default common beam mechanism for multiple beam scenario
A wireless device receives one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions. The wireless device receives a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states. The wireless device receives, based on a reference signal identified during a random access procedure and before receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, one or more downlink signals.
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 one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions;
receive a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states; and
receive, based on a reference signal identified during a random access procedure and before receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, one or more downlink signals.
2. The wireless device of claim 1 , wherein the instructions further cause the wireless device to:
receive the DCI indicating the TCI state; and
receive, after receiving the DCI, one or more second downlink signals based on the TCI state.
3. The wireless device of claim 1 , further comprising initiating the random access procedure for:
a reconfiguration with synchronization procedure; or
an initial access procedure.
4. The wireless device of claim 1 , wherein the reference signal is used until the DCI, indicating the TCI state, is received.
5. The wireless device of claim 1 , wherein the one or more messages are one or more radio resource control (RRC) messages.
6. The wireless device of claim 1 , wherein the one or more downlink signals comprise a reception of at least one of:
a physical downlink control channel (PDCCH);
a physical downlink shared channel (PDSCH); or
a second reference signal.
7. The wireless device of claim 1 , wherein the instructions further cause the wireless device to receive the one or more downlink signals further based on a spatial filter corresponding to the reference signal.
8. The wireless device of claim 7 , wherein the instructions further cause the wireless device to determine the spatial filter to be a same spatial filter used for reception of the reference signal.
9. A non-transitory computer-readable storage medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions;
receive a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states; and
receive, based on a reference signal identified during a random access procedure and before receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, one or more downlink signals.
10. The non-transitory computer-readable storage medium of claim 9 , wherein the instructions further cause the wireless device to:
receive the DCI indicating the TCI state; and
receive, after receiving the DCI, one or more second downlink signals based on the TCI state.
11. The non-transitory computer-readable storage medium of claim 9 , wherein the instructions further cause the wireless device to initiate the random access procedure for:
a reconfiguration with synchronization procedure; or
an initial access procedure.
12. The non-transitory computer-readable storage medium of claim 9 , wherein the reference signal is used until the DCI, indicating the TCI state, is received.
13. The non-transitory computer-readable storage medium of claim 9 , wherein the one or more messages are one or more radio resource control (RRC) messages.
14. A method comprising:
receiving, by a wireless device, one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions;
receiving a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states; and
receiving, based on a reference signal identified during a random access procedure and before receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, one or more downlink signals.
15. The method of claim 14 , further comprising:
receiving the DCI indicating the TCI state; and
receiving, after the receiving the DCI, one or more second downlink signals based on the TCI state.
16. The method of claim 14 , further comprising initiating the random access procedure for:
a reconfiguration with synchronization procedure; or
an initial access procedure.
17. The method of claim 14 , wherein the reference signal is used until the DCI, indicating the TCI state, is received.
18. The method of claim 14 , wherein the one or more messages are one or more radio resource control (RRC) messages.
19. The method of claim 14 , wherein the one or more downlink signals comprise a reception of at least one of:
a physical downlink control channel (PDCCH);
a physical downlink shared channel (PDSCH); or
a second reference signal.
20. The method of claim 14 , further comprising receiving the one or more downlink signals further based on a spatial filter corresponding to the reference signal.