Determining a beam failure event for a cell according to channel qualities

1 . A wireless radio link recovery method comprising:

determining, by a wireless communication device, a beam failure event for a first cell according to channel qualities corresponding to one or more reference signal resources transmitted by a wireless communication node;

determining, by the wireless communication device, whether a physical uplink shared channel (PUSCH) resource is available for transmitting a beam recovery request message;

transmitting, by the wireless communication device to the wireless communication node, the beam recovery request message on the PUSCH resource in response to determining that the PUSCH resource is available for transmitting the beam recovery request message, wherein the beam recovery request message comprises an index of the first cell; and

transmitting, by the wireless communication device to the wireless communication node via a second cell, a resource request (RQ) message on an uplink control channel in response to determining that the PUSCH resource is not available for transmitting the beam recover request message, the RQ message requesting allocation of the PUSCH resource and comprising a first scheduling request (SR) message associated with a parameter of a beam recovery configuration, wherein the RQ message is transmitted with a higher transmission priority than an aperiodic sounding reference signal (SRS) when a physical uplink control channel (PUCCH) resource assigned for the RQ message overlaps with the SRS in a time unit.

2 . The wireless radio link recovery method of claim 1 , wherein the beam recovery request message comprises a medium access control element (MAC-CE) message, including an index of a candidate reference signal for the first cell or an indication that no candidate reference signal is identified for the first cell.

3 . The wireless radio link recovery method of claim 1 , wherein transmitting the beam recovery request message comprises transmitting the beam recovery request message on the PUSCH resource using a second cell.

4 . The wireless radio link recovery method of claim 1 , wherein determining the beam failure event for the first cell comprises:

determining that one or more values representing the channel qualities of the one or more reference signal resources are outside an acceptable range determined by a quality threshold;

incrementing a beam failure counter; and

determining that the beam failure counter is greater than or equal to a beam failure counter threshold to determine a beam failure event.

5 . The wireless radio link recovery method of claim 1 , wherein transmitting the RQ message comprises transmitting the RQ message when the following conditions are met:

the PUCCH resource for the RQ message does not overlap with a measurement gap; and

the PUCCH resource for the RQ message does not overlap with the PUSCH resource.

6 . The wireless radio link recovery method of claim 1 , further comprising:

canceling a pending RQ message to be transmitted in response to:

transmitting, by the wireless communication device, a protocol data unit (PDU) message that includes the beam recovery request message; or

deactivating the first cell.

7 . The wireless radio link recovery method of claim 1 , wherein transmitting the RQ message further comprises:

transmitting the RQ message with a higher transmission priority than an aperiodic sounding reference signal (SRS) when a PUCCH assigned for the RQ message overlaps with the SRS in a time unit.

8 . The wireless radio link recovery method of claim 1 , further comprising:

determining that an RQ prohibit timer is stopped, expired, or both; and

allowing the transmission of the RQ message and restarting the RQ prohibit timer when the RQ prohibit timer is either stopped or expired.

9 . The wireless radio link recovery method of claim 1 , further comprising:

determining that an RQ transmission counter has not reached a maximum number of RQ transmissions; and

incrementing the RQ transmission counter and allowing the transmission of the RQ message.

10 . The wireless radio link recovery method of claim 9 , wherein the RQ transmission counter is reset when an RQ transmission is triggered and there are no other pending RQ messages corresponding to the same RQ configuration.

11 . A wireless communication device comprising: a processor and a memory, wherein the processor is configured to read computer code from the memory to perform steps comprising:

determining, by the wireless communication device, a beam failure event for a first cell according to channel qualities corresponding to one or more reference signal resources transmitted by a wireless communication node;

determining, by the wireless communication device, whether a physical uplink shared channel (PUSCH) resource is available for transmitting a beam recovery request message;

transmitting, by the wireless communication device to the wireless communication node, the beam recovery request message on the PUSCH resource in response to determining that the PUSCH resource is available for transmitting the beam recovery request message, wherein the beam recovery request message comprises an index of the first cell; and

transmitting, by the wireless communication device to the wireless communication node via a second cell, a resource request (RQ) message on an uplink control channel in response to determining that the PUSCH resource is not available for transmitting the beam recover request message, the RQ message requesting allocation of the PUSCH resource and comprising a first scheduling request (SR) message associated with a parameter of a beam recovery configuration, wherein the RQ message is transmitted with a higher transmission priority than an aperiodic sounding reference signal (SRS) when a physical uplink control channel (PUCCH) resource assigned for the RQ message overlaps with the SRS in a time unit.

12 . The wireless communication device of claim 11 , wherein the beam recovery request message corresponds to a plurality of cells that are associated with a recovery configuration.

13 . The wireless communication device of claim 11 , wherein the processor is configured to the read computer code from the memory to determine the beam failure event for the first cell by steps comprising:

determining that one or more values representing the channel qualities of the one or more reference signal resources are outside an acceptable range determined by a quality threshold;

incrementing a beam failure counter; and

determining that the beam failure counter is greater than or equal to a beam failure counter threshold to determine a beam failure event.

14 . The wireless communication device of claim 11 , wherein the processor is configured to the read computer code from the memory to transmit the RQ message when the following conditions are met:

the PUCCH resource for the RQ message does not overlap with a measurement gap; and

the PUCCH resource for the RQ message does not overlap with the PUSCH resource.

15 . The wireless communication device of claim 11 , wherein the processor is further configured to the read computer code from the memory to perform steps comprising:

canceling a pending RQ message to be transmitted in response to:

transmitting, by the wireless communication device, a protocol data unit (PDU) message that includes the beam recovery request message; or

deactivating the first cell.

16 . The wireless communication device of claim 11 , wherein the processor is further configured to the read computer code from the memory to perform steps comprising:

determining that an RQ prohibit timer is stopped, expired, or both; and

allowing the transmission of the RQ message and restarting the RQ prohibit timer when the RQ prohibit timer is either stopped or expired.

17 . The wireless communication device of claim 11 , wherein the processor is configured to read computer code from the memory to perform steps comprising:

determining that an RQ transmission counter has not reached a maximum number of RQ transmissions;

incrementing the RQ transmission counter and allowing the transmission of the RQ message; and

resetting the RQ transmission counter when an RQ transmission is triggered and there are no other pending RQ messages corresponding to the same RQ configuration.