Beam Failure in Wireless Communications
Wireless communications are described. Resource(s) associated with beam failure may be used. A wireless device may initiate a beam failure detection procedure based on receiving a medium access control (MAC) control element (CE). The MAC CE may be configured to activate/cause activation of a subset of a plurality of reference signals associated with beam failure of a cell.
1 . A method comprising:
receiving, by a wireless device, one or more radio resource control (RRC) messages comprising one or more configuration parameters that indicate a plurality of reference signals associated with beam failure of a cell; and
based on receiving a medium access control (MAC) control element (CE) configured to cause activation of a subset of the plurality of reference signals, performing a beam failure detection of the cell.
2 . The method of claim 1 , further comprising:
waiting to perform the beam failure detection of the cell until receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals.
3 . The method of claim 1 , further comprising:
based on receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals, assessing, for the beam failure detection of the cell, a radio link quality of at least one reference signal of the plurality of reference signals.
4 . The method of claim 1 , wherein the plurality of reference signals comprises at least one reference signal for beam failure recovery of the cell.
5 . The method of claim 1 , wherein the plurality of reference signals comprises at least one reference signal for candidate beam detection associated with the cell.
6 . The method of claim 1 , further comprising:
incrementing a beam failure instance counter based on a beam failure instance indication of the cell.
7 . The method of claim 6 , further comprising:
resetting the beam failure instance counter to zero based on receiving a second MAC CE indicating a second subset of the plurality of reference signals for the beam failure of the cell.
8 . The method of claim 1 , further comprising:
transmitting, based on the beam failure detection and for the beam failure of the cell, an uplink signal indicating a reference signal among the subset of the plurality of reference signals.
9 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure the wireless device to:
receive one or more radio resource control (RRC) messages comprising one or more configuration parameters that indicate a plurality of reference signals associated with beam failure of a cell; and
based on receiving a medium access control (MAC) control element (CE) configured to cause activation of a subset of the plurality of reference signals, perform a beam failure detection of the cell.
10 . The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
wait to perform the beam failure detection of the cell until receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals.
11 . The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
based on receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals, assess, for the beam failure detection of the cell, a radio link quality of at least one reference signal of the plurality of reference signals.
12 . The wireless device of claim 9 , wherein the plurality of reference signals comprises at least one reference signal for beam failure recovery of the cell.
13 . The wireless device of claim 9 , wherein the plurality of reference signals comprises at least one reference signal for candidate beam detection associated with the cell.
14 . The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
increment a beam failure instance counter based on a beam failure instance indication of the cell.
15 . The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
reset the beam failure instance counter to zero based on receiving a second MAC CE indicating a second subset of the plurality of reference signals for the beam failure of the cell.
16 . The wireless device of claim 9 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
transmit, based on the beam failure detection and for the beam failure of the cell, an uplink signal indicating a reference signal among the subset of the plurality of reference signals.
17 . A system comprising:
a base station configured to send one or more radio resource control (RRC) messages comprising one or more configuration parameters that indicate a plurality of reference signals associated with beam failure of a cell; and
a wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure the wireless device to:
receive the one or more RRC messages; and
based on receiving a medium access control (MAC) control element (CE) configured to cause activation of a subset of the plurality of reference signals, perform a beam failure detection of the cell.
18 . The system of claim 17 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
wait to perform the beam failure detection of the cell until receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals.
19 . The system of claim 17 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
based on receiving the MAC CE configured to cause activation of the subset of the plurality of reference signals, assess, for the beam failure detection of the cell, a radio link quality of at least one reference signal of the plurality of reference signals.
20 . The system of claim 17 , wherein the plurality of reference signals comprises at least one reference signal for beam failure recovery of the cell.