Dynamic Handover Load Threshold for Multi-Network QoS
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Solution Overview
Problem
Current handover mechanisms between GSM and UMTS radio networks often result in suboptimal performance due to rigid load threshold criteria, leading to reduced Quality of Service (QoS) as they prioritize one network over another, even if the best-suited network is available, causing potential degradation of existing communications.
Innovation Solution
A communication system that dynamically adjusts the handover load threshold based on the received handover preference message, allowing for flexible handover decisions by considering the load indication and preference indication, enabling handovers to be accepted at higher load levels for preferred networks and rejected for non-preferred networks, thus optimizing resource allocation and QoS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid load threshold criteria are used for handover decisions, then network stability is improved, but handover performance and Quality of Service deteriorate
Solution Approach 1:
The patent applies dynamics by making the handover load threshold adjustable rather than fixed. The threshold is dynamically modified based on handover preference indications received from the core network, allowing the system to adapt between rigid (stable) and flexible (performance-optimized) modes depending on service requirements
Solution Approach 2:
The patent changes the parameter of load threshold values based on handover preference indications. Different threshold configurations are applied depending on whether the service prefers the current or target radio network, transforming a static parameter into a conditional variable that optimizes handover outcomes
2Productivity
If handover load threshold is increased to accept more handovers, then productivity is improved, but Quality of Service deteriorates due to network overload
Solution Approach 1:
The patent applies local quality by setting different load thresholds for different services based on their handover preferences. Rather than using a uniform threshold for all handovers, the system tailors the threshold to each service's requirements, allowing aggressive thresholds for services preferring the target network while maintaining conservative thresholds for others
Solution Approach 2:
The system dynamically adjusts the load threshold based on real-time handover preference indications, enabling the network to be more productive (accept more handovers) when services prefer the target network, while maintaining QoS by reverting to conservative thresholds when preferences indicate otherwise
3Device complexity
If handover decisions are made based solely on current network load, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent applies preliminary action by receiving handover preference indications from the core network before actual handover execution. This advance information allows the target radio network to pre-configure appropriate load thresholds, simplifying the decision-making process while improving adaptability to service-specific requirements
Solution Approach 2:
The system uses feedback from handover preference indications to adjust handover decisions. The core network provides feedback about service preferences, which the target network uses to modify its acceptance criteria, creating a closed-loop system that balances simplicity with adaptability
Data Source
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AI summary
A communication system (100) comprises a first radio network supporting a first air interface standard and a second radio network supporting a second air interface standard. The second radio network comprises a network interface (401) which receives a handover request message from the first radio network to hand over a remote station (101) to the second network. A handover preference processor (405) receives a handover preference message for the remote station (101). The handover preference message comprises a preference indication for a radio network for the remote station (101). A load processor (409) determines a load indication for the second radio network and a load threshold processor (407) determines a handover load threshold for the remote station in response to the preference indication. A handover evaluation processor (403) determines whether to accept the handover in response to a comparison of the load indication and the handover load threshold. The invention may allow improved handovers in multi-air interface standard communication systems.