	US 12,231,885 B2
	Methods, architectures, apparatuses and systems for WTRU-to-network relays
Xiaoyan Shi, Westmount (CA); Samir Ferdi, Kirkland (CA); Saad Ahmad, Montreal (CA); Michelle Perras, Montréal (CA); Alec Brusilovsky, Downingtown, PA (US); and Guanzhou Wang, Brossard (CA)
Appl. No. 17/774,716
Filed by InterDigital Patent Holdings, Inc., Wilmington, DE (US)
PCT Filed Nov. 6, 2020, PCT No. PCT/US2020/059530 § 371(c)(1), (2) Date May 5, 2022, PCT Pub. No. WO2021/092480, PCT Pub. Date May 14, 2021.
Claims priority of provisional application 63/086,436, filed on Oct. 1, 2020.
Claims priority of provisional application 62/975,956, filed on Feb. 13, 2020.
Claims priority of provisional application 62/957,530, filed on Jan. 6, 2020.
Claims priority of provisional application 62/932,219, filed on Nov. 7, 2019.
Prior Publication US 2023/0023639 A1, Jan. 26, 2023
Int. Cl. H04W 12/069 (2021.01)

CPC H04W 12/069 (2021.01)

17 Claims

1. A method, implemented by a first wireless transmit/receive unit (WTRU), comprising:

authenticating, via a second WTRU, the first WTRU with a network;

determining a PC5 root key based on a master key obtained from the authenticating of the first WTRU;

receiving, from the second WTRU, a first PC5 message protected based on the PC5 root key, wherein the first PC5 message is a direct security mode command message;

determining one or more third keys, including an encryption key and/or an integrity key, based on the PC5 root key; and

sending, to the second WTRU, a second PC5 message, wherein the second PC5 message is a direct security mode complete message is protected using at least one of the one or more third keys.