Mobile Terminal GW Storage for Handover Latency Reduction
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Solution Overview
Problem
In mobile communication systems, handovers between access devices without context information transfer result in delays due to inappropriate GW selection or congestion, leading to increased handover times and connection issues.
Innovation Solution
A mobile communication system with a GW information storage device that stores and manages GW information, allowing access devices to uniquely identify and connect to the previously used GW, reducing handover delays by minimizing unnecessary communication and GW selection errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If context information transfer function is not available between access devices, then handover process becomes simpler, but GW identification accuracy deteriorates leading to inappropriate GW selection
Solution Approach 1:
The system performs preliminary actions by having the mobile terminal store GW identification information (such as GGSN address or identifier) in its memory before handover occurs. When handover happens between access devices without context transfer capability, the terminal can directly provide the stored GW identification to the new access device, enabling accurate GW selection without requiring complex context transfer mechanisms between access devices.
2Adaptability or versatility
If GW selection is performed without stored context information, then system adaptability increases, but handover time increases due to re-selection delays
Solution Approach 1:
The mobile terminal performs preliminary actions by storing GW identification information in advance before handover. This pre-stored information is immediately utilized during handover to the new access device, eliminating the need for time-consuming GW re-selection processes and reducing handover latency while maintaining system adaptability.
Solution Approach 2:
The system uses copying by having the mobile terminal store a copy of the GW identification information (such as GGSN address) in its local memory. This copied information can be quickly retrieved and provided to the new access device during handover, avoiding the need to re-query or re-establish the GW connection and significantly reducing handover time.
3Productivity
If mobile terminal stores GW identification information, then handover efficiency improves, but terminal memory requirements increase
Solution Approach 1:
The system applies local quality by having the mobile terminal store GW identification information specifically in its memory only when needed for handover operations. This targeted storage approach minimizes memory usage while maintaining high handover efficiency, as the terminal only retains essential GW identification data (such as GGSN address or identifier) rather than storing all possible context information.
Data Source
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AI summary
A gateway information storage device (60) includes a gateway information storage unit (61) which stores gateway information indicating a gateway (GW) to which a mobile terminal (10) is being connected. An access device (20) includes: a gateway information acquiring unit (23) which acquires the gateway information from the gateway information storage device (60) in response to a connection request in handover that is received from the mobile terminal (10); and a connection processor unit (22) which establishes a connection between the mobile terminal (10) and a gateway (GW20B) identified by the gateway information acquired from the gateway information storage device (60).