Local Anchor Gateway Retention for Wireless Mobility
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Solution Overview
Problem
In wireless systems, mobile nodes face challenges in maintaining anchoring when moving between radio access networks without a context transfer interface, leading to disrupted communication and increased signaling to the home gateway, particularly affecting roaming users.
Innovation Solution
A method where the home server assigns and retains a local anchor gateway for a mobile node by updating its user profile with the initial gateway's indication, allowing seamless anchoring even across networks without a direct context transfer interface, thereby maintaining connectivity and reducing signaling to the home gateway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mobile node moves between radio access networks without a context transfer interface, then the mobile node can access different networks, but the anchoring is disrupted and communication continuity is lost
Solution Approach 1:
The home server pre-assigns a local anchor gateway to the mobile node during initial attachment or profile setup, storing this assignment in the user profile. This preliminary action ensures that when the mobile node moves to a new radio access network, the local anchor gateway is already designated and can immediately resume anchoring functions, maintaining communication continuity without disruption.
2Ease of operation
If the mobile node moves to a new radio access network, then the mobile node can maintain network connectivity, but signaling to the home gateway increases
Solution Approach 1:
The system designates a local anchor gateway in the visited network to handle mobility management for the mobile node, rather than requiring all signaling to traverse to the distant home gateway. This localizes the anchoring function, reducing signaling overhead and energy consumption while maintaining network connectivity. The local anchor gateway handles binding updates and context management locally, minimizing distant communications.
3Reliability
If the home server updates the user profile with the initial gateway indication, then the local anchor can be retained during mobility, but the home server must store and retrieve gateway information
Solution Approach 1:
The home server integrates multiple functions including user profile management, local anchor gateway assignment, and mobility coordination. By making the home server multi-functional, the system avoids adding separate dedicated components for anchor management. The home server's existing profile storage and retrieval capabilities are extended to include gateway indication information, achieving anchoring stability without significantly increasing overall system complexity.
Data Source
AI summary
The invention involves a method for achieving local anchoring of a mobile node (MN) in a wireless system comprising a plurality of radio access networks (RANs), a plurality of gateways (GWs), each capable of acting as a serving gateway, and a home server, with each RAN being connected to a GW, and a user profile relating to the MN being stored in the home server. According to the method, when the mobile node has a radio link with a first RAN which is connected to a first GW, the first GW is assigned as a local anchor for the MN, and the user profile relating to the MN in the home server is updated with an indication of the first GW. And when the mobile node moves to a second RAN which is also connected to the first GW, the indication of the first GW is retrieved from the user profile relating to the MN in the home server, and the first GW assigned is kept as a local anchor for the MN, based on the retrieved indication of the first GW.