Mobile Terminal Handover Link Local Address Acquisition
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Solution Overview
Problem
Conventional Fast Mobile IP (FMIP) techniques face challenges in quickly transmitting packets outside a subnet after handover, as the mobile terminal often fails to promptly update its routing table with the new access router's link local address, leading to packet loss and delayed communication.
Innovation Solution
The communication system enables the mobile terminal to request and acquire the link local address of the new access router immediately after handover, allowing it to quickly update its routing table and initiate packet transmission by incorporating this address for external communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile terminal uses conventional FMIP technique without requesting link local address, then the handover process is simpler, but packet transmission to outside subnet is delayed or lost after handover
Solution Approach 1:
The mobile terminal requests the link local address of the new access router immediately after handover, before packet transmission is needed. This preliminary acquisition of routing information ensures that the routing table is updated in advance, preventing packet loss and delays when external communication is initiated.
2Speed
If the mobile terminal quickly updates routing table with new access router address, then packet transmission speed improves, but communication protocol complexity increases
Solution Approach 1:
The mobile terminal autonomously requests and acquires the link local address of the new access router itself, without requiring external assistance or complex coordinated protocols. This self-service approach simplifies the overall system while enabling rapid routing table updates for quick packet transmission.
Data Source
AI summary
A new technique is disclosed, by which a mobile terminal executing handover between subnets can quickly transmit packet to outside immediately after the handover. According to this technique, MN (mobile node) 10 executing the handover requests an external transmission address relating to a subnet connected after the handover (a link local address of an access router or of a default router belonging to the subnet after the handover) when transmitting an FNA message to NAR31 connected immediately after the handover. In response to the request, NAR acquires the external transmission address and transmits the external transmission address to MN by sending an RA message to MN. MN sets up the external transmission address acquired before the handover to the packet to be transmitted after the handover.