Beam switching and recovery

An apparatus for wireless communication, the apparatus being a first device, comprising:

• at least one processor;
• and
• a memory coupled to the at least one processor, the memory storing instructions executable by the at least one processor which, when executed by the at least one processor, causes the first device to:
• transmit a beam switch message (BSM) to a second device via a first beam set, the BSM including a command to switch from communication via the first beam set to communication via a second beam set at a switch time;
• when a response message to the BSM is unreceived, monitor for communications from the second device via both the second beam set and the first beam set after the switch time;
• and
• in response to the monitoring:
• maintain the first beam set for communication with the second device if a message on the first beam set is received from the second device after the switch time;
• or maintain the second beam set for communication with the second device if a message on the second beam set is received from the second device.

An apparatus for wireless communication for a first device, comprising:

• means for transmitting a beam switch message (BSM) to a second device via a first beam set, the BSM including a command to switch from communication via the first beam set to communication via a second beam set at a switch time;
• means for monitoring for communications from the second device via both the second beam set and the first beam set after the switch time, when a response message to the BSM is unreceived;
• and
• means for maintaining, in response to the means for monitoring, the first beam set for communication with the second device if a message on the first beam set is received from the second device after the switch time;
• or means for maintaining, in response to the means for monitoring, the second beam set for communication with the second device if a message on the second beam set is received from the second device.

A computer-readable medium storing computer executable code for a first device, comprising code to:

• transmit a beam switch message (BSM) to a second device via a first beam set, the BSM including a command to switch from communication via the first beam set to communication via a second beam set at a switch time;
• when a response message to the BSM is unreceived, monitor for communications from the second device via both the second beam set and the first beam set after the switch time;
• and
• in response to the monitoring:
• maintain the first beam set for communication with the second device if a message on the first beam set is received from the second device after the switch time;
• or maintain the second beam set for communication with the second device if a message on the second beam set is received from the second device.