Mobile Terminal Pre-Handover Address Acquisition

The mobile terminal performs preliminary actions by requesting and acquiring the link local address of the access router at the handover destination subnet before the actual handover occurs. This is achieved by sending a Router Solicitation for Proxy (RtSolPr) message to the current access router, which retrieves and provides the link local address from the target subnet's Router Advertisement. By obtaining this address in advance, the terminal can immediately update its routing table after handover without waiting for post-handover address acquisition, thus reducing packet loss and transmission delay.

The current access router acts as an intermediary that facilitates the pre-handover acquisition of the target subnet's link local address. When the mobile terminal sends an RtSolPr message requesting the link local address, the current access router retrieves this information from the target access router's Router Advertisement and provides it to the terminal. This intermediary mechanism allows the terminal to obtain necessary address information without directly complex interactions with the target subnet, simplifying the overall protocol while improving handover efficiency.

The mobile terminal applies local quality by specifically updating only the default router entry in its routing table with the acquired link local address of the target subnet's access router. Instead of managing complex routing entries for all possible destinations, the terminal focuses on updating the critical default router pointer that directs packets to the correct subnet gateway. This selective update approach enables rapid packet transmission to external networks while keeping routing table management relatively simple.