US 11,706,801 B2
Method of listen before talk recovery procedure and related device
Heng-Li Chin, Taipei (TW); Hsin-Hsi Tsai, Taipei (TW); Mei-Ju Shih, Taipei (TW); and Chia-Hung Wei, Taipei (TW)
Assigned to FG Innovation Company Limited, Tuen Mun (HK)
Filed by FG Innovation Company Limited, Tuen Mun (HK)
Filed on Nov. 9, 2020, as Appl. No. 17/93,044.
Claims priority of provisional application 62/932,198, filed on Nov. 7, 2019.
Claims priority of provisional application 62/934,673, filed on Nov. 13, 2019.
Prior Publication US 2021/0144761 A1, May 13, 2021
Int. Cl. H04W 74/08 (2009.01); H04W 72/0453 (2023.01); H04W 36/30 (2009.01); H04W 36/00 (2009.01); H04W 72/04 (2023.01)
CPC H04W 74/0808 (2013.01) [H04W 36/0079 (2018.08); H04W 36/305 (2018.08); H04W 72/042 (2013.01); H04W 72/0453 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of a listen before talk (LBT) recovery procedure performed by a user equipment (UE), the method comprising:
performing an LBT failure detection procedure for a serving cell;
triggering 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
cancelling 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.