Dynamic Refresh Interval for Wireless Resource Reservation
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Solution Overview
Problem
In wireless networks, resource reservation systems face inefficiencies due to resource wastage during mobile node handoffs, as existing methods either require separate authorization processes or increase the number of refresh messages, leading to resource loss and inefficient resource management.
Innovation Solution
A resource reservation system and method that dynamically adjusts the refresh interval based on history information, such as average dwell time and handoff frequency, to minimize resource loss during handoffs, allowing for rapid release of old path resources without additional authorization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed refresh interval is used in RSVP, then resource reservation is maintained, but resource wastage occurs during handoff due to delayed release of old path resources
Solution Approach 1:
The refresh interval is changed from a fixed value to a dynamic value that adapts based on handoff detection. When handoff is detected, the refresh interval is adjusted to enable faster resource release on the old path, while maintaining normal operation during stable connections.
Solution Approach 2:
The system implements feedback by monitoring handoff events and using this information to adjust the refresh interval. The mobile node detects handoff occurrence and modifies the refresh interval accordingly, creating a closed-loop control system that responds to network conditions.
2Speed
If the refresh interval is reduced to release old path resources faster, then resource release speed improves, but the number of refresh messages increases leading to system load increase
Solution Approach 1:
The refresh interval dynamically adjusts between two states: normal interval during stable connections and reduced interval during handoff events. This dynamic adjustment enables fast resource release only when necessary, avoiding the continuous overhead of a permanently reduced refresh interval.
Solution Approach 2:
The system changes the refresh interval parameter based on detected handoff events. By modifying this key parameter only when needed, the system achieves fast resource release during handoff while maintaining normal system operation during stable periods, thus avoiding continuous increase in system load.
3Reliability
If a separate authorization process is implemented for rapid resource release, then resource management control improves, but the complexity of the handoff process increases
Solution Approach 1:
The mobile node autonomously detects handoff events and independently adjusts the refresh interval without requiring external authorization. This self-service approach enables rapid resource release while avoiding the complexity of additional authorization protocols between network entities.
Data Source
AI summary
A resource reservation system and a method for managing resources under consideration of the mobility of an MN are provided where an old refresh interval for an old resource reservation state is changed in response to handoff. The changed refresh interval propagates through at least one of a path supporting a corresponding session before the handoff and a path newly established due to handoff occurrence. When the handoff is completed, resources are released on a path, which is a part of the path supporting the corresponding session before the handoff and is not used due to the handoff occurrence, based on the changed refresh interval.