Mobile Node Handover Method Reducing Tunnel Overhead
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Solution Overview
Problem
Conventional mobile communication systems face inefficiencies in handover processes when a mobile node moves between networks supporting different IP versions, leading to increased header overhead and decreased communication efficiency due to the requirement of additional IPv4 tunnel headers and time-consuming key update processes.
Innovation Solution
A handover method that detects the target access network as a home link when it supports only IPv4, allowing the allocation of an IPv4 address as a home address, reducing tunnel overhead and enabling packet transmission and reception before key update completion by performing a binding process independently of the key update process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile node uses IPv4 care-of address binding with home address in DSMIP to enable communication from IPv4-only access networks, then communication capability is improved, but header overhead increases due to additional IPv4 tunnel headers
Solution Approach 1:
The patent extracts the IPv4 tunnel header requirement by detecting home link conditions and eliminating the need for tunneling when the access network is a home link. The mobile node detects whether the access network is a home link by comparing the IPv4 care-of address subnet with the home address subnet, and only applies tunneling when necessary, thereby removing unnecessary header overhead while preserving communication capability.
Solution Approach 2:
The patent applies different packet processing methods based on local network conditions. When the access network is detected as a home link, packets are transmitted without tunnel headers (direct routing). When it is not a home link, packets use IPv4 tunnel headers. This localized adaptation optimizes header overhead based on the specific network context.
2Reliability
If the mobile node performs key update process before binding process during handover, then security is improved, but communication efficiency decreases due to time-consuming key updates
Solution Approach 1:
The patent performs the binding process in advance during the handover procedure, before the key update process is completed. The mobile node sends binding update messages to the home agent using the new care-of address even while key updates are in progress. This preliminary binding action allows the network to prepare for packet routing before security credentials are fully updated, reducing handover latency.
Solution Approach 2:
The patent dynamically separates the binding process from the key update process, allowing them to proceed in parallel rather than sequentially. The binding process can be initiated and partially completed while key updates are ongoing, creating a dynamic handover procedure that overlaps these two critical processes to minimize total handover time.
Data Source
AI summary
A technology is disclosed that provides a handover method and the like capable of improving communication efficiency by reducing tunnel overhead between a mobile node and a home agent. The technology includes: a step of transmitting, by a mobile node (UE) 107, a message including a home address allocation request in a network 102 of the handover destination and an allocated first address, to a home agent (HA) via an access router 104 before a handover; and a step of performing, by the HA, a predetermined process based on the received message and transmitting to the UE, a response message including a home address in response to the allocation request.