Question: In a mobile originating packet switched session, how does a UE (User Equipment) typically obtain its IPv6 address if it supports IPv6, after receiving the PDP CONTEXT ACCEPT message via NAS signalling?
Option 1: Through DHCPv6 (Dynamic Host Configuration Protocol for IPv6) immediately after the PDP context is established.
Option 2: By sending an ICMPv4 Echo Request to prompt the network for an IPv6 address allocation.
Option 3: Automatically, without any additional signalling, as the full IPv6 address is always included in the PDP CONTEXT ACCEPT message.
Option 4: Via IPv6 Stateless Address Autoconfiguration, initiated by the UE sending an ICMPv6 Router Solicitation message.
Explanation: This is correct because, according to the described procedure for UEs supporting IPv6, after the PDP context is established, the UE may perform IPv6 Stateless Address Autoconfiguration. This process begins with the UE sending an ICMPv6 Router Solicitation message to which the network responds with an ICMPv6 Router Advertisement message, facilitating the autoconfiguration.