Core-Edge Handover via Central Mapping Database
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Solution Overview
Problem
Current wireless communication systems face challenges in seamless roaming and handover between networks, particularly with global roaming, as they struggle to efficiently manage mobility and routing scalability, leading to increased costs and reduced routing speed.
Innovation Solution
The implementation of a method that uses a central mapping database to redirect packets destined for mobile nodes by mapping provider-independent IP addresses to provider-aggregatable IP addresses, enabling efficient handover between egress routers and supporting both fast and slow mobility through a network-based mobility management system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional routing methods are used in wireless communication networks, then routing scalability is maintained, but handover efficiency and roaming capability deteriorate
Solution Approach 1:
The patent segments the IP address structure into two parts: a network prefix (routed traditionally) and a host identifier (managed by the mapping database). This segmentation allows routing tables to remain simple while enabling efficient handover through the mapping database that tracks mobile node locations independently of the routing infrastructure.
Solution Approach 2:
The patent introduces a mapping database as an intermediary between the routing system and mobile nodes. This database stores mappings between permanent IP addresses and current router identifiers, enabling fast handover by providing location information without requiring routing table updates, thus resolving the contradiction between handover efficiency and routing scalability.
2Adaptability or versatility
If mobile nodes frequently change networks during roaming, then global roaming capability is improved, but packet loss and connection drops increase
Solution Approach 1:
The patent implements preliminary action by maintaining permanent IP addresses for mobile nodes and pre-establishing mappings in the mapping database. When handover occurs, the system can immediately redirect packets to the new network using the pre-stored mapping information, preventing packet loss and maintaining connection stability while enabling seamless global roaming.
3Speed
If routing tables are updated frequently to track mobile nodes, then handover speed is improved, but routing system complexity and costs increase
Solution Approach 1:
The patent extracts the mobile node location tracking function from the routing system and places it in a separate mapping database. This extraction allows the routing tables to remain simple and static, while the mapping database handles dynamic location updates independently, achieving fast handover without increasing routing system complexity or costs.
Data Source
AI summary
In one embodiment of the invention, a method for wireless communication includes receiving a packet destined to a destination node at a first egress router. The destination node is supported by a second egress router. A destination address of the packet is the first egress router. The received packet is redirected to the second egress router.