Method of listen before talk recovery procedure and related device

A user equipment (UE) for performing a listen before talk (LBT) recovery procedure, the UE comprising:

• at least one processor;
• and
• at least one non-transitory computer-readable medium coupled to the at least one processor and storing computer-executable instructions that, executed by the at least one processor, cause the UE to:
• perform an LBT failure detection procedure for a serving cell;
• trigger the LBT recovery procedure for a first bandwidth part (BWP) of the serving cell in response to detecting consistent uplink (UL) LBT failures in the first BWP of the serving cell via the LBT failure detection procedure, the LBT recovery procedure comprising triggering an LBT failure procedure for the first BWP for determining the first BWP as an invalid BWP;
• and
• cancel the triggered LBT recovery procedure for the first BWP of the serving cell in response to confirming a predefined condition in the UE is met,
• wherein the LBT recovery procedure further comprises:
• transmitting an LBT failure medium access control (MAC) control element (CE) indicating that the LBT failure procedure is triggered for the serving cell to a network on the serving cell in a case that the serving cell is a Special Cell (SpCell), or transmitting the LBT failure MAC CE to the network on another serving cell on which no LBT failure procedure is triggered in a case that the serving cell is a Secondary Cell (SCell);
• switching from the first BWP to a second BWP of the serving cell in response to no LBT failure procedure being triggered for the second BWP and the second BWP being configured with a physical random access channel (PRACH) resource in a case that the serving cell is the SpCell;
• and
• initiating a random access procedure on the second BWP of the serving cell in a case that the serving cell is the SpCell.