US 12,439,234 B2
Methods and apparatus for direct discovery and communication using a WTRU to WTRU relay
Samir Ferdi, Kirkland (CA); Michelle Perras, Montreal (CA); Saad Ahmad, Montreal (CA); and Xiaoyan Shi, Westmount (CA)
Assigned to INTERDIGITAL PATENT HOLDINGS, INC., Wilmington, DE (US)
Appl. No. 17/772,249
Filed by InterDigital Patent Holdings, Inc., Wilmington, DE (US)
PCT Filed Nov. 6, 2020, PCT No. PCT/US2020/059417
§ 371(c)(1), (2) Date Apr. 27, 2022,
PCT Pub. No. WO2021/092384, PCT Pub. Date May 14, 2021.
Claims priority of provisional application 62/932,147, filed on Nov. 7, 2019.
Claims priority of provisional application 62/935,971, filed on Nov. 15, 2019.
Claims priority of provisional application 62/975,834, filed on Feb. 13, 2020.
Claims priority of provisional application 63/028,112, filed on May 21, 2020.
Prior Publication US 2022/0377524 A1, Nov. 24, 2022
Int. Cl. H04W 8/00 (2009.01); H04W 76/14 (2018.01); H04W 88/04 (2009.01); H04W 92/18 (2009.01)
CPC H04W 8/005 (2013.01) [H04W 76/14 (2018.02); H04W 88/04 (2013.01); H04W 92/18 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method implemented by a relay wireless transmit/receive unit (WTRU), the method comprising:
receiving a first discovery message from a first WTRU, the first discovery message comprising a first identifier (ID) for the first WTRU;
modifying the received first discovery message by adding a relay ID (RID) identifying the relay WTRU and by replacing the first ID for the first WTRU with a first relay ID for the relay WTRU;
sending the modified discovery message;
receiving a link establishment message from a second WTRU in response to the modified discovery message, the link establishment message comprising a second ID for the second WTRU;
modifying the received link establishment message by adding the RID and replacing the second ID for the second WTRU with a second relay ID for the relay WTRU;
forwarding the modified link establishment message to the first WTRU; and
relaying PC5 unicast messages between the first WTRU and second WTRU, wherein PC5 unicast messages received from the first WTRU that indicate a destination associated with the second relay ID of the relay WTRU are forwarded to the second WTRU with an indication of a source associated with the first relay ID of the relay WTRU.