Section: 6.2.4.4 Additional requirements of the UE acting as 5G ProSe layer-3 UE-to-network relay UE for IP address allocation
Content: If a UE acting as 5G ProSe layer-3 UE-to-network relay needs to indicate "IPv6 Router" or "DHCPv4 Server & IPv6 Router" in the IP address configuration IE as specified in 3GPP 24.554 [19E], the UE shall support acting as a "Requesting Router" as described in IETF RFC 8415 [33D] to request additional IPv6 prefixes (i.e. prefixes in addition to the /64 default prefix which was allocated via stateless IPv6 address autoconfiguration as specified in subclause 6.2.4.1) from the SMF as specified in subclause 5.5.2 of 3GPP TS 23.304[ Proximity based Services (ProSe) in the 5G System (5GS) ]  [6E]. When the UE acting as 5G ProSe layer-3 UE-to-network relay UE requests additional prefixes using DHCPv6, the UE shall perform procedures described in subclause 6.2.4.2a.