Local Routing in Mobile Networks Bypassing Home Agent
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Solution Overview
Problem
In mobile WiMax networks, traffic between mobile stations connected to the same ASN GW is delayed due to the necessity of passing through a Home Agent (HA), which worsens during roaming services due to greater physical distances between the ASN GW and HA.
Innovation Solution
Implementing a method and system for establishing local routing within the ASN GW, allowing direct traffic transmission between mobile stations connected to the same ASN GW without routing through the HA, by determining location information and establishing local routing paths to bypass the HA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traffic is routed through the Home Agent (HA) for all mobile stations connected to the same ASN GW, then routing consistency and security are maintained, but traffic delay increases unnecessarily
Solution Approach 1:
The patent segments the routing path into two types: local routing for traffic between MSs under the same ASN GW, and HA routing for other cases. This segmentation allows traffic to take the shorter local path when possible, reducing delay while maintaining HA involvement for security-critical paths.
Solution Approach 2:
The ASN GW acts as an intermediary that can directly forward traffic between MSs without involving the HA, while still maintaining routing consistency through location information verification. This intermediary role resolves the contradiction by providing both direct routing and security verification.
2Reliability
If traffic is routed through the Home Agent (HA), then security and authentication are ensured, but the physical distance between ASN GW and HA exacerbates traffic delay during roaming services
Solution Approach 1:
The patent applies local quality by enabling direct local routing within the same ASN GW where security can be verified through location information, while allowing HA routing for roaming cases where security verification requires HA involvement. This creates different routing qualities for different locations.
Solution Approach 2:
The system performs preliminary location information verification at the ASN GW to determine whether MSs are under the same ASN GW before routing traffic. This preliminary action enables the system to choose the faster local routing path in advance, avoiding unnecessary HA traversal.
3Extent of automation
If all traffic passes through the Home Agent (HA), then centralized control and security management are maintained, but unnecessary transmission overhead and delay are introduced
Solution Approach 1:
The patent introduces dynamic routing selection based on location information. The ASN GW dynamically determines whether to use local routing or HA routing for each traffic flow, optimizing transmission efficiency while maintaining centralized control through the session server's location management.
Solution Approach 2:
The system uses location information feedback from the session server to the ASN GW to make routing decisions. This feedback mechanism enables the ASN GW to automatically select the appropriate routing path, balancing centralized control with transmission efficiency.
Data Source
AI summary
A method and a system for establishing a local routing in a mobile communication network, and for allowing different mobile stations connected with the same Access Service Network GateWay (ASN GW) to transmit and receive traffic without delivering such traffic to a Home Agent (HA) are provided. In the method, a session server determines whether first and second mobile stations are connected with the same ASN GW by using their location information. In case of a connection with the same ASN GW, the session server establishes a local routing in the ASN GW so that traffic between the first and second mobile stations is directly routed to each other at the ASN GW. Then the ASN GW receiving the traffic from one of both mobile stations transmits the traffic to the other according to the local routing.