Predictive Handoff Mechanism for Cellular Data Session Continuity
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Solution Overview
Problem
The existing handoff process in cellular wireless data communication systems is inefficient when transferring data sessions between RNCs, leading to disruptions and inefficiencies, especially when the source and target sectors are served by different RNCs.
Innovation Solution
A predictive handoff mechanism where the RNC anticipates the need for handoff, reserves radio resources, and sends a directive message to the wireless communication device to wait and then hand off to the target RNC, ensuring a seamless transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handoff process is used when transferring data sessions between different RNCs, then handoff can be completed, but disruptions occur and efficiency is reduced
Solution Approach 1:
The source RNC performs preliminary actions by predicting handoff requirements before the handoff actually occurs. The system analyzes pilot signal strengths and determines when handoff is anticipated to be needed, allowing proactive resource reservation at the target RNC and preparation of handoff parameters, thereby avoiding disruptions and improving handoff efficiency
2Reliability
If radio resources are reserved in advance at target RNC, then handoff disruption is reduced, but system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the source RNC continuously monitors pilot signal strengths from multiple sectors and provides feedback about handoff anticipation. This feedback-driven approach allows the system to reserve resources at the target RNC only when actually needed, rather than maintaining permanent complex resource reservation structures, thereby reducing handoff disruptions without excessively increasing system complexity
Data Source
AI summary
A method and system for managing handoff of a cellular wireless data session between a first wireless coverage area and second wireless coverage area. A first radio network controller (RNC) predicts that handoff of the data session will soon be necessary. Radio resources for continuing the data session in the second wireless coverage area are reserved. The reserved radio resources may be controlled by the first RNC or by a second RNC. The first RNC sends, to a wireless communication device, a predictive handoff directive message that instructs the wireless communication device (i) to wait a designated period of time, and (ii) to then handoff the data session.