Default Beam for Downlink Signal Transmissions
A method comprises receiving, by a wireless device, one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions, and receiving a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states. The method comprises receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, and receiving, based on a reference signal identified during a random access procedure and before application of the TCI state, one or more downlink signals.
1 . 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;
receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states; and
receiving, based on a reference signal identified during a random access procedure and before application of the TCI state, one or more downlink signals.
2 . The method of claim 1 , comprising receiving, based on the TCI state and after application of the TCI state, one or more second downlink signals.
3 . The method of claim 1 , comprising initiating the random access procedure for a reconfiguration with synchronization procedure.
4 . The method of claim 1 , comprising initiating the random access procedure for an initial access procedure.
5 . The method of claim 1 , wherein the reference signal is used until the TCI state, indicated by the DCI, is applied.
6 . The method of claim 1 , wherein the one or more messages are one or more radio resource control (RRC) messages.
7 . The method of claim 1 , wherein the reference signal is a synchronization signal (SS)/physical broadcast channel (PBCH) block (SSB).
8 . The method of claim 1 , wherein the reference signal identified during the random access procedure is the reference signal used for a spatial domain filter parameter of a preamble during the random access procedure.
9 . The method of claim 1 , wherein the one or more downlink signals comprise at least one of:
one or more physical downlink shared channels (PDSCHs);
one or more physical downlink control channels (PDCCHs); or
one or more channel state information reference signals (CSI-RSs).
10 . The method of claim 1 , wherein the one or more downlink signals are received using a spatial domain filter parameter based on the reference signal identified during the random access procedure.
11 . A method comprising:
transmitting, by a base station to a wireless device, one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions;
transmitting, to the wireless device, a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states;
transmitting, to the wireless device, downlink control information (DCI) indicating a TCI state from the plurality of TCI states; and
transmitting, to the wireless device based on a reference signal identified during a random access procedure and before application of the TCI state, one or more downlink signals.
12 . The method of claim 11 , comprising transmitting, to the wireless device based on the TCI state and after application of the TCI state, one or more second downlink signals.
13 . The method of claim 11 , comprising initiating the random access procedure for a reconfiguration with synchronization procedure.
14 . The method of claim 11 , comprising initiating the random access procedure for an initial access procedure.
15 . The method of claim 11 , wherein the reference signal is used until the TCI state, indicated by the DCI, is applied.
16 . The method of claim 11 , wherein the one or more messages are one or more radio resource control (RRC) messages.
17 . The method of claim 11 , wherein the reference signal is a synchronization signal (SS)/physical broadcast channel (PBCH) block (SSB).
18 . The method of claim 11 , wherein the reference signal identified during the random access procedure is the reference signal used for a spatial domain filter parameter of a preamble during the random access procedure.
19 . The method of claim 11 , wherein the one or more downlink signals comprise at least one of:
one or more physical downlink shared channels (PDSCHs);
one or more physical downlink control channels (PDCCHs); or
one or more channel state information reference signals (CSI-RSs).
20 . The method of claim 11 , wherein the one or more downlink signals are transmitted using a spatial domain filter parameter based on the reference signal identified during the random access procedure.