Solicited Router Advertisement
To get the allocated IPv6 prefix, UE sends a router solicit message. Upon receiving the router solicit message, SMF sends the router advertisement message containing the allocated UE IPv6 prefix towards UE.

To get the allocated IPv6 prefix, UE sends a router solicit message. Upon receiving the router solicit message, SMF sends the router advertisement message containing the allocated UE IPv6 prefix towards UE.