Beam failure recovery for secondary cell

A method for wireless communication, comprising:

• configuring, by a second device, parameters associated with beam failure detection and beam failure recovery;
• transmitting, by the second device, the parameters to a first device to trigger a beam failure recovery request medium access control (MAC) control element upon a determination that a beam failure event has occurred;
• and
• transmitting, by the second device, an implicit acknowledgement of receipt of the beam failure recovery request MAC control element,
• wherein, upon a determination that the beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure is performed for at least one secondary cell with the beam failure event;
• and
• receiving, by the second device, from the first device, a scheduling request in case no uplink shared channel is available for sending the beam failure recovery request MAC control element, wherein the scheduling request is canceled in case that a transmission of a medium access control protocol data unit including a corresponding one or more the beam failure recovery request MAC control elements is triggered prior to an assembling of the medium access control protocol data unit.

An apparatus for wireless communication, comprising a memory and a processor, wherein the processor reads code from the memory and implements a method, comprising:

• receiving, by a first device, parameters configured to carry out beam failure detection and beam failure recovery for at least one secondary cell associated with the first device;
• determining, by the first device, whether a beam failure event has occurred on at least one of the at least one secondary cell based on at least one of the parameters;
• triggering, upon a determination that the beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure for the at least one secondary cell with the beam failure event, and initiating a scheduling request in case no uplink shared channel is available for sending the beam failure recovery request MAC control element, wherein the scheduling request is canceled in case that a transmission of a MAC protocol data unit including a corresponding one or more the beam failure recovery request MAC control elements is triggered prior to an assembling of the medium access control protocol data unit;
• and
• terminating the beam failure recovery procedure upon an occurrence of a termination event.

An apparatus for wireless communication, comprising a memory and a processor, wherein the processor reads code from the memory and implements a method, comprising:

• configuring, by a second device, parameters associated with beam failure detection and beam failure recovery;
• transmitting, by the second device, the parameters to a first device to trigger a beam failure recovery request medium access control (MAC) control element upon a determination that a beam failure event has occurred;
• and
• transmitting, by the second device, an implicit acknowledgement of receipt of the beam failure recovery request MAC control element,
• wherein, upon a determination that the beam failure event has occurred, a beam failure recovery request medium access control (MAC) control element for a beam failure recovery procedure is performed for at least one secondary cell with the beam failure event;
• and
• receiving, by the second device, from the first device, a scheduling request in case no uplink shared channel is available for sending the beam failure recovery request MAC control element, wherein the scheduling request is canceled in case that a transmission of a medium access control protocol data unit including a corresponding one or more the beam failure recovery request MAC control elements is triggered prior to an assembling of the medium access control protocol data unit.