Coordinated Multipoint Resource Scheduling for Intermittent Coverage
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Solution Overview
Problem
In wireless communication systems, frequent changes in uplink/downlink frame configurations can lead to intermittent coverage for wireless devices near the edge of the coverage area, resulting in reduced uplink throughput and quality of service issues.
Innovation Solution
A nonlinear function of signal quality indicators is used to prioritize air-interface resource scheduling, giving higher priority to devices that frequently lose and regain coverage, and employing coordinated multipoint reception to improve uplink throughput when devices cannot maintain minimum desired throughput with a single access node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If subframe allocation is changed to meet traffic demands, then network performance is improved, but coverage area becomes unstable causing devices to lose coverage
Solution Approach 1:
The system dynamically adjusts frame configurations based on traffic demands while using a nonlinear priority function that adapts to coverage stability requirements. The priority function modifies resource allocation in real-time to compensate for coverage changes, allowing the system to be both dynamic in response to traffic and stable in maintaining coverage for edge devices.
2Adaptability or versatility
If frame configuration changes frequently to adapt to traffic patterns, then adaptability is improved, but devices experience intermittent coverage and throughput degradation
Solution Approach 1:
The system changes frame configuration parameters to adapt to traffic patterns, but introduces a nonlinear priority function that modifies resource allocation parameters based on signal quality indicators. This compensatory parameter change ensures that devices experiencing coverage degradation receive adjusted resource allocation to maintain throughput.
3Ease of operation
If air-interface resources are allocated equally among all devices, then fairness is maintained, but devices with intermittent coverage cannot meet throughput thresholds
Solution Approach 1:
Instead of uniform resource allocation, the system applies local quality by differentiating resource allocation based on device-specific conditions. The nonlinear priority function evaluates signal quality indicators for each device and adjusts resource allocation locally, giving higher priority to devices with intermittent coverage while maintaining adequate allocation for others.
4Reliability
If coordinated multipoint reception is employed to improve throughput, then system complexity increases, but coverage reliability is enhanced
Solution Approach 1:
The system prepares for potential coverage issues by pre-configuring multiple access nodes and establishing coordinated multipoint reception capabilities in advance. When a device experiences intermittent coverage, the system can quickly activate the pre-prepared coordinated reception without requiring complex real-time decision-making, thus enhancing reliability while limiting complexity growth.
Data Source
AI summary
Using a first access node, a set of wireless devices are communicated with using a first frame configuration. The communication using the first frame configuration meets a first throughput threshold criteria for both a first and second subsets of the wireless devices A second frame configuration having a second ratio of uplink subframes to downlink subframes is selected. Based on the selection of the second frame configuration, a second access node is used concurrently with the first access node to communicate with the second subset of wireless devices using the second frame configuration.