Timing advance in beam failure recovery request transmission
A wireless device receives message(s) comprising configuration parameter(s) indicating reference signal(s) of a cell. The configuration parameter(s) may indicate one or more preambles for a beam failure recovery procedure. The configuration parameter(s) may indicate a time alignment timer of a timing advance group comprising the cell. The time alignment timer may start in response to receiving a timing advance command for the timing advance group. The beam failure recovery procedure may be initiated in response to detecting a beam failure of the cell. The beam failure of the cell may be detected based on the reference signal(s) of the cell. A preamble of the one or more preambles may be transmitted for the beam failure recovery procedure. The beam failure recovery procedure may be aborted in response to an expiry of the time alignment timer during the beam failure recovery procedure.
1. A method comprising:
receiving, by a wireless device, one or more messages comprising one or more configuration parameters indicating:
one or more reference signals of a cell;
and
a time alignment timer of a timing advance group comprising the cell;
starting the time alignment timer in response to receiving a timing advance command for the timing advance group;
initiating a beam failure recovery procedure for the cell in response to detecting, based on the one or more reference signals of the cell, a beam failure of the cell;
transmitting an uplink signal for the beam failure recovery procedure; and
aborting the beam failure recovery procedure in response to an expiry of the time alignment timer during the beam failure recovery procedure.
2. The method of claim 1 , wherein the aborting the beam failure recovery procedure comprises stopping the transmitting the uplink signal for the beam failure recovery procedure.
3. The method of claim 1 , wherein the one or more configuration parameters further indicate one or more second reference signals of the cell and one or more beam failure recovery request resources on the cell, wherein the one or more beam failure recovery request resources comprise the uplink signal.
4. The method of claim 3 , wherein the one or more second reference signals of the cell comprise one or more second channel state information reference signals.
5. The method of claim 3 , wherein the one or more second reference signals of the cell comprise one or more second synchronization signal blocks.
6. The method of claim 3 , wherein the one or more configuration parameters further indicate an association between each of the one or more second reference signals of the cell and each of the one or more beam failure recovery request resources.
7. The method of claim 1 , wherein the one or more reference signals of the cell comprise one or more first channel state information reference signals.
8. The method of claim 1 , wherein the one or more reference signals of the cell comprise one or more first synchronization signal blocks.
9. The method of claim 1 , wherein the detecting the beam failure comprises assessing the one or more reference signals of the cell with radio quality lower than a first threshold.
10. The method of claim 9 , wherein the first threshold is based on a hypothetical block error rate.
11. The method of claim 1 , wherein initiating the beam failure recovery procedure comprises selecting a selected reference signal in one or more second reference signals of the cell, wherein the selected reference signal is associated with a beam failure recovery request resource of one or more beam failure recovery request resources.
12. The method of claim 11 , wherein:
the configuration parameters further indicate one or more preambles for a beam failure recovery procedure;
the uplink signal is a preamble; and
the beam failure recovery request resource comprises the preamble and at least one random access channel resource.
13. The method of claim 12 , wherein the at least one random access channel resource comprises at least one of:
one or more time resources; or
one or more frequency resources on the cell.
14. The method of claim 11 , wherein the selected reference signal has a radio quality higher than a second threshold.
15. The method of claim 14 , wherein the second threshold is based on layer-1 reference signal received power.
16. The method of claim 1 , wherein the timing advance group comprises one or more cells using a same timing reference.
17. The method of claim 1 , wherein the timing advance command comprises a timing advance command medium access control control element comprising a timing advance group index indicating the timing advance group.
18. The method of claim 1 , further comprising receiving the timing advance command in a random-access response message for the cell of the timing advance group.
19. The method of claim 1 , wherein aborting the beam failure recovery procedure comprises initiating a random-access procedure with a timing advance value being equal to zero.
20. The method of claim 1 , wherein aborting the beam failure recovery procedure comprises indicating the aborting the beam failure recovery procedure to a higher layer of the wireless device.