Visited Network Home Agent Assignment for Mobile IPv6
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Solution Overview
Problem
In Mobile IPv6 technologies, the assignment of a home agent is typically done in the home network, leading to inefficient communication when the mobile node is far away, as it requires establishing a bidirectional tunnel through the home network, causing delays and reducing communication efficiency.
Innovation Solution
A method and system that allow a visited network to dynamically assign a home agent to a mobile terminal, enabling the mobile node to establish a local bidirectional tunnel with the home agent, reducing delay and improving communication efficiency by allowing the home network to authorize the visited network for HA assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the home agent is assigned in the home network, then the Mobile IPv6 binding can be established securely, but the communication efficiency deteriorates when the mobile node is far away due to the need to establish a bidirectional tunnel through the home network
Solution Approach 1:
The patent introduces the visited network as an intermediary that can assign home agents on behalf of the home network. The visited network acts as a mediator between the mobile node and the home network, allowing the MN to establish bindings with a locally assigned HA in the visited network while the home network maintains ultimate control through authorization mechanisms. This resolves the contradiction by enabling efficient local communication while preserving security through the home network's authorization oversight.
2Productivity
If the home agent is assigned in the visited network, then the communication efficiency improves by establishing a local bidirectional tunnel, but the control over the assignment procedure becomes more complex
Solution Approach 1:
The patent implements preliminary action by requiring the home network to pre-authorize the visited network for home agent assignment before the mobile node can utilize this service. The home network configures authorization information in advance, which simplifies the runtime assignment process. The visited network can then assign HAs using pre-configured authorization data, reducing the complexity of real-time control decisions while maintaining security and efficiency benefits.
3Length of moving object
If the mobile node is far away from the home network, then the communication distance increases, but the latency increases as a result of routing traffic through the home network
Solution Approach 1:
The patent applies local quality by allowing different parts of the network to have different home agent assignment characteristics. Specifically, mobile nodes in visited networks can obtain HAs locally assigned in the visited network, creating a localized binding relationship that optimizes communication for that specific location. This resolves the latency issue by eliminating the need for traffic to traverse the entire path back to the home network and back, while maintaining the ability to have centrally controlled HA assignment through the home network's authorization mechanism.
Data Source
AI summary
The invention discloses a method and system for assigning a home agent, and the method includes: indicating, by a visited network, to a home network that the visited network supports the home agent assignment; receiving, by the visited network, authorization information from the home network, the authorization information indicates the visited network is authorized for assigning the home agent; and sending, by the visited network, information about an address of the home agent to a mobile node. The invention can remedy the drawback that the home agent can be assigned to the mobile node only in the home network, thus improving the communication efficiency and reducing the delay. Further, an effective control can be enforced on assignment, so that the visited network can indicate to the home network whether it can support assigning of the home agent, and the home network can enforce a control on whether to perform assignment in the visited network.