Beam failure recovery mechanism

A method for communication, comprising:

• in accordance with a determination that a beam failure occurs in a special cell, initiating, by a first device, a contention-based random access procedure for beam failure recovery of the special cell;
• indicate by the first device a candidate beam for beam failure recovery of the special cell to a second device via a preamble during the contention-based random access procedure;
• including, by the first device, an indication for indicating the beam failure for the special cell into a media access control (MAC) control element (CE);
• and
• transmitting, by the first device, the MAC CE to the second device via a Msg. 3 during the contention-based random access procedure;
• wherein the special cell comprises a primary cell or a primary secondary cell, and wherein the MAC CE omits information related to the candidate beam for beam failure recovery of the special cell.

A non-transitory computer readable medium comprising program instructions for causing a first device to:

• in accordance with a determination that a beam failure occurs in a special cell, initiate a contention-based random access procedure for beam failure recovery of the special cell;
• indicate by the first device a candidate beam for beam failure recovery of the special cell to a second device via a preamble during the contention-based random access procedure;
• include an indication for indicating the beam failure for the special cell into a media access control (MAC) control element (CE);
• and
• transmit the MAC CE to the second device via a Msg. 3 during the contention-based random access procedure;
• wherein the special cell comprises a primary cell or a primary secondary cell, and wherein the MAC CE omits information related to the candidate beam for beam failure recovery of the special cell.