Centralized Access Controller Handover Quality Management
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Solution Overview
Problem
The existing dual mode handover process in UMA technology faces challenges such as handover failures and degraded call quality due to reliance on uncontrolled handset algorithms and media gateway quality of service (QoS) event packages, particularly when transitioning between cellular and unlicensed wireless networks.
Innovation Solution
A system and method that utilize a centralized access controller (CAC) and customer premises equipment (CPE) to facilitate handovers by rejecting requests for channel modifications that would lead to quality deterioration, and trigger handovers based on advanced quality assessments, eliminating the need for uncontrolled handset algorithms and QoS event packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handover is triggered based on uncontrolled handset algorithms, then handover initiation is simplified, but handover failure rate increases and call quality deteriorates
Solution Approach 1:
The patent introduces a centralized access controller (CAC) as an intermediary between the mobile station and the network. The CAC receives handover requests, evaluates resource availability and quality metrics, and makes informed handover decisions. This mediator resolves the contradiction by maintaining simple handset algorithms while adding intelligence at the network level to ensure reliable handovers.
2Reliability
If channel modification requests are granted to enhance service quality, then user experience improves, but existing communication quality deteriorates
Solution Approach 1:
The patent implements partial action by allowing channel modifications only when resource availability and quality metrics indicate sufficient capacity. The CAC evaluates each modification request against current network conditions and only approves changes that will not degrade existing communications, thus applying enhancement partially and selectively.
Solution Approach 2:
The system implements feedback mechanisms where the CAC continuously monitors communication quality metrics and resource availability. This feedback loop allows the system to adjust channel modification decisions in real-time, preventing degradation of existing communications while enabling service quality enhancement when conditions permit.
3Adaptability or versatility
If dual mode handover process is implemented, then network roaming capability is enhanced, but handover performance and call quality deteriorate
Solution Approach 1:
The patent segments the handover control function into distinct components: the centralized access controller handles resource evaluation and decision-making, while the mobile station handles basic handover initiation. This segmentation allows dual-mode roaming capability to be maintained while improving handover performance through specialized control functions at each level.
Data Source
AI summary
A method for assisting in a handover is provided that includes utilizing a link between a centralized access controller (CAC) and customer premises equipment (CPE) to facilitate a communication session involving a mobile station. The method also includes rejecting a handover from a public network to a cell controlled by the CAC after recognizing, in advance, that sufficient resources are unavailable for supporting a channel to be employed for the handover.