Session Handover via Bind Information Management
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Solution Overview
Problem
Current methods for session handover between mobile terminals, such as during a handover from a cellular terminal to a WiMAX terminal, result in session disconnection due to IP address changes, requiring a session layer to adapt to each new IP address, which is not suitable for general-purpose applications and complicates packet transmission.
Innovation Solution
A network system with a bind information management function, address translation, and encapsulation between Home Agents (HAs) that allows seamless handover between terminals without changing the IP address, using a terminal's local area communication interface to manage bind information and trigger handovers, and rewriting IP addresses to maintain continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a handover is performed between terminals with different IP addresses, then mobility between terminals is enabled, but session disconnection occurs due to IP address change
Solution Approach 1:
The invention introduces a session layer as an intermediary component that sits between the application layer and the network layer. This session layer maintains session state information and continues to use the original IP address for communication even when the terminal handover occurs. The session layer acts as a mediator that translates between the new IP address (after handover) and the original IP address used by the application, thereby maintaining session continuity without requiring application-level changes.
2Reliability
If a session layer is provided to maintain session during handover, then session continuity is maintained, but device complexity increases due to additional session layer components
Solution Approach 1:
The session layer is designed to perform multiple functions: it maintains session state, manages IP address translation, and coordinates with both the application layer and network layer. By consolidating these functions into a single multi-functional component, the invention reduces overall system complexity compared to having separate components for each function. The session layer universally handles various session management tasks across different handover scenarios.
3Reliability
If IP address translation is performed during handover, then session continuity is maintained, but packet transmission complexity increases
Solution Approach 1:
The session layer performs preliminary actions by establishing and maintaining the session state information before handover occurs. It pre-configures the translation rules and maintains the original IP address binding. When handover occurs, the translation process is straightforward because the session layer has already prepared the mapping relationships. This preliminary setup simplifies the actual packet transmission during and after handover.
Data Source
AI summary
It is difficult to perform handover between mobile terminals. In addition, when a session handover is performed between terminals whose mobilities are managed by individual Mobile IP HAs, it is difficult for an IETF standard to normally treat an Uplink packet. A network system includes: a function 9 that manages bind information between terminals which are arranged in a network and are subjected to the control of a user; a function 5 that translates an address; a function 7 that performs encapsulation between HAs; and a function that is provided in a terminal and transmits the bind information and a handover trigger to the bind information management function 9.