US 12,294,484 B2
Method and apparatus for handling sidelink radio link failure in a wireless communication system
Richard Lee-Chee Kuo, Taipei (TW)
Assigned to ASUSTek Computer Inc., Taipei (TW)
Filed by ASUSTek Computer Inc., Taipei (TW)
Filed on May 28, 2021, as Appl. No. 17/333,838.
Claims priority of provisional application 63/045,744, filed on Jun. 29, 2020.
Prior Publication US 2021/0409263 A1, Dec. 30, 2021
Int. Cl. H04W 76/34 (2018.01); H04L 41/0677 (2022.01); H04W 76/15 (2018.01); H04W 88/04 (2009.01)
CPC H04L 41/0677 (2013.01) [H04W 76/15 (2018.02); H04W 76/34 (2018.02); H04W 88/04 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for a User Equipment-to-User Equipment (UE-to-UE) Relay, comprising:
the UE-to-UE Relay establishes a first PC5 unicast link with a first UE and establishes a second PC5 unicast link with a second UE;
the UE-to-UE Relay receives data from the first UE and forwards the data to the second UE;
the UE-to-UE Relay detects a sidelink radio link failure on the first PC5 unicast link between the UE-to-UE Relay and the first UE; and
the UE-to-UE Relay transmits a first PC5-S message to the second UE to release the second PC5 unicast link between the UE-to-UE Relay and the second UE responsive to detecting the sidelink radio link failure on the first PC5 unicast link between the UE-to-UE Relay and the first UE, wherein the second PC5 unicast link is released in a Layer-2 link release procedure and the UE-to-UE Relay releases one or more Sidelink (SL) Data Radio Bearers (DRBs) established for the second PC5 unicast link between the UE-to-UE Relay and the second UE responsive to detecting the sidelink radio link failure on the first PC5 unicast link between the UE-to-UE Relay and the first UE.