Mobile Node Routing Rule Registration for Multi-Interface Packet Forwarding
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Solution Overview
Problem
When a mobile node with multiple interfaces uses a second address generated from a home network prefix in addition to a home address, existing systems face challenges in registering routing rules without increasing message traffic and ensuring secure forwarding of packets to the correct interface, leading to security issues and inefficient address management.
Innovation Solution
The mobile node registers a routing rule with the home agent at the time of simultaneous connections to specify packet forwarding destinations for both addresses, allowing the home agent to forward packets based on these rules without increasing message traffic, and sets application conditions for routing rules to ensure secure and efficient forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile node uses a second address generated from home network prefix in addition to home address, then address management flexibility is improved, but security issues arise and message traffic increases
Solution Approach 1:
The patent applies preliminary action by having the mobile node register routing rules with the home agent in advance, before any packet forwarding occurs. The routing rule includes the second address and specifies the interface for packet forwarding, so that when packets arrive at the home agent destined for the second address, the forwarding decision is already determined and secure. This prevents security issues by establishing proper routing configuration beforehand rather than reacting to potential security threats after they occur.
2Manufacturing precision
If routing rules are registered for each address separately, then forwarding accuracy is improved, but message traffic increases
Solution Approach 1:
The patent merges the registration of routing rules for multiple addresses into a single unified process. The mobile node registers a single routing rule that encompasses both the home address and the second address generated from the home network prefix, specifying the same interface for forwarding packets to both addresses. This consolidation maintains forwarding accuracy by explicitly defining the interface for each address while reducing message traffic by eliminating redundant registration messages.
3Adaptability or versatility
If the home agent forwards packets to all addresses generated from home network prefix, then address reachability is improved, but unintended packet delivery occurs
Solution Approach 1:
The patent applies local quality by making the packet forwarding behavior specific to each address and its intended interface. The routing rule explicitly associates the second address with a specific interface of the mobile node, so that packets destined for the second address are forwarded only to that particular interface. This prevents unintended packet delivery by ensuring that each address has its own designated forwarding path, rather than broadcasting to all possible interfaces.
Data Source
AI summary
Disclosed in a technique for registering, with a home agent, a routing rule for specifying packets destined to a second address generated from a home prefix as well as a home address and/or flow destination interfaces without increasing the number of messages. According to this technique, when a UE 10 is communicating (flow 1 and flow 2) with a CN 17 using the HoA, a routing rule indicating, for example, that flow 1 of packets destined to a HNP address is forwarded to a 3GPP interface IF1 and flow 2 of packets destined to the HNP address is forwarded to a WLAN interface IF2 is registered with a P-GW 13 through a routing rule registration message 21 such as a BU message at the time of starting simultaneous connections of the interfaces IF1 and IF2.