IPv6 Mobile Handover Using Link Layer Notifications
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Solution Overview
Problem
Current IPv6-based mobile systems face challenges with reactive handover, including high signaling overhead, packet loss, and latency, particularly in real-time applications like VoIP, due to unreliable prediction information and the need for buffering and bi-casting mechanisms.
Innovation Solution
The proposed solution involves an apparatus that reduces handover latency by using link layer notifications to quickly initiate movement detection and duplicate address detection procedures, assigning new care-of addresses from address pools, and sending router advertisements via unicast to reduce signaling load and support real-time applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If proactive handover techniques are used with prediction information, then handover can be initiated before connection break, but prediction information is unreliable and causes erroneous movement and packet loss
Solution Approach 1:
The patent inverts the conventional proactive handover approach by using reactive handover triggered by link layer notifications. Instead of predicting movement and initiating handover before connection break (which causes erroneous movement), the system waits for actual connection events and responds immediately, achieving both low latency and high reliability
Solution Approach 2:
The patent applies preliminary action by pre-configuring address pools with available care-of addresses before handover is needed. When a link layer notification arrives, the mobile unit can immediately assign an address from the pre-prepared pool without waiting for address allocation procedures, reducing handover latency while maintaining reliability
2Reliability
If buffering and bi-casting mechanisms are used to support reactive handover, then packet loss is reduced, but signaling overhead and device complexity increase
Solution Approach 1:
The patent extracts and removes the complex buffering and bi-casting mechanisms from the handover process. By using link layer notifications that provide advance awareness of connection events, the system eliminates the need for packet buffering at correspondent nodes and bi-casting to multiple access routers, thereby reducing signaling overhead and device complexity while maintaining packet delivery reliability
Solution Approach 2:
The patent introduces link layer notifications as an intermediary mechanism between the access router and mobile unit. This intermediary provides reliable packet delivery information without requiring the complex buffering and bi-casting infrastructure, simplifying the overall system while maintaining reliability
3Adaptability or versatility
If conventional MIPv6 handover procedures are used, then mobility management is provided, but handover latency is too high for real-time applications like VoIP
Solution Approach 1:
The patent applies preliminary action by pre-configuring address pools with available care-of addresses before handover is needed. When a link layer notification arrives, the mobile unit can immediately assign an address from the pre-prepared pool without waiting for address allocation procedures, reducing handover latency while maintaining mobility management capability
Solution Approach 2:
The patent skips the conventional MIPv6 handover procedures (router solicitation, router advertisement, binding update exchanges) by using link layer notifications that provide immediate awareness of connection events. This allows the mobile unit to perform rapid address assignment and handover without going through the time-consuming conventional protocol exchanges, achieving low latency suitable for real-time applications
Data Source
AI summary
An apparatus for a fast reactive handover in an Internet Protocol version 6 (IPv6) mobile system is provided, in which a message receiver receives a new connection notification message from a point of attachment when the point of attachment makes a new connection with a mobile unit, and a message transmitter sends a router advertisement (RA) message to the mobile unit in response to receiving the new connection notification message.