Inter-RNC Boundary Handoff Delay for Wireless Access Terminals
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Solution Overview
Problem
In wireless communication systems, access terminals experience 'ping-pong' effects when moving between inter-RNC boundary zones, leading to repeated session initiation and handoff attempts, consuming network resources and potentially causing session failures, especially in low-latency applications like QChat.
Innovation Solution
An access terminal determines if it is in an inter-RNC boundary zone and delays handoff until the current communication session segment is complete if the target coverage area is served by a different RNC, otherwise handing off immediately if the target area is served by the same RNC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the access terminal performs immediate handoff upon detecting a target coverage area, then the handoff speed is improved, but network resource consumption increases and session failures occur due to ping-pong effects in inter-RNC boundary zones
Solution Approach 1:
The patent applies dynamics by making the handoff procedure adaptive based on terminal mobility characteristics. The system dynamically adjusts handoff behavior: low-mobility terminals delay handoff until segment completion to avoid ping-pong effects, while high-mobility terminals perform immediate handoff to maintain speed. This dynamic adaptation resolves the contradiction between handoff speed and network resource consumption.
Solution Approach 2:
The patent changes the handoff timing parameter based on terminal mobility classification. For low-mobility terminals, the handoff is delayed until the current segment completes; for high-mobility terminals, immediate handoff is performed. This parameter change resolves the technical contradiction by optimizing handoff behavior for different mobility scenarios.
2Ease of operation
If the access terminal performs immediate handoff upon detecting a target coverage area, then the handoff responsiveness is improved, but session reliability deteriorates due to repeated handoff attempts in inter-RNC boundary zones
Solution Approach 1:
The system dynamically adjusts handoff responsiveness based on terminal mobility. Low-mobility terminals experience delayed handoff until segment completion, improving reliability by avoiding ping-pong effects. High-mobility terminals maintain immediate handoff responsiveness. This dynamic approach resolves the contradiction between responsiveness and reliability.
Solution Approach 2:
The handoff timing parameter is changed based on mobility classification: delayed handoff for low-mobility terminals improves session reliability by preventing repeated failures, while immediate handoff is maintained for high-mobility terminals to preserve responsiveness.
3Loss of energy
If the access terminal delays handoff until segment completion in inter-RNC boundary zones, then network resource consumption is reduced, but handoff latency increases
Solution Approach 1:
The patent applies dynamics by making handoff timing adaptive to terminal mobility. Low-mobility terminals delay handoff until segment completion, reducing network resource consumption despite increased latency. High-mobility terminals perform immediate handoff, accepting higher resource consumption to maintain low latency. This dynamic approach resolves the contradiction.
Solution Approach 2:
The handoff timing parameter is changed based on mobility classification: delayed handoff for low-mobility terminals reduces network resource consumption, while immediate handoff for high-mobility terminals maintains low latency.
4Stability of the object's composition
If the access terminal performs frequent handoff attempts in inter-RNC boundary zones, then coverage continuity is maintained, but session stability deteriorates due to ping-pong effects
Solution Approach 1:
The system dynamically adjusts handoff behavior based on terminal mobility. Low-mobility terminals delay handoff until segment completion, improving session stability by avoiding ping-pong effects while maintaining coverage continuity. High-mobility terminals perform immediate handoff to maintain coverage continuity despite potential instability. This dynamic approach resolves the contradiction.
Data Source
AI summary
A method is disclosed that can be carried out in an access network comprising a plurality of coverage areas, each coverage area being served by an RNC. The method involves making a determination that an access terminal is located in an inter-RNC boundary zone, and then, during a communication session: (i) determining that a handoff from a source coverage area to a target coverage area should be performed; (ii) determining whether or not the target coverage area is served by the same RNC as the source coverage area; (iii) if the target coverage area is not served by the same RNC as the source coverage area, delaying handoff until a current segment of the communication session is complete; and (iv) if the target coverage area is served by the same RNC, handing off the communication session to the target coverage area.