Dynamic Frame Configuration Interference Mitigation
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Solution Overview
Problem
Wireless networks face interference issues when access nodes deploy wireless air-interface resources in different frame configurations using the same frequency sub-band, leading to potential interference between neighboring nodes.
Innovation Solution
The solution involves determining interfering subframes and reconfiguring them by either muting or aggregating resources from secondary carriers to minimize interference, allowing access nodes to adjust their frame configurations to reduce conflicts, particularly by using carrier aggregation and subframe blanking techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If access nodes deploy wireless air-interface resources in different frame configurations using the same frequency sub-band, then network capacity and flexibility are improved, but interference between neighboring nodes increases
Solution Approach 1:
The patent applies local quality by allowing different frame configurations only in specific geographic locations where traffic patterns warrant them, while maintaining uniform frame configurations in other areas. This enables network operators to deploy downlink-biased or uplink-biased frame configurations locally at specific access nodes based on local traffic conditions, rather than forcing a uniform configuration across the entire network, thus achieving adaptability without widespread interference
Solution Approach 2:
The patent introduces a frame configuration coordination mechanism that acts as an intermediary between access nodes with different frame configurations. This coordination entity manages the deployment of different frame configurations by identifying compatible neighboring nodes, adjusting timing relationships, and preventing harmful interference patterns, thereby enabling diverse frame configurations to coexist without causing interference
2Productivity
If access nodes reconfigure to deploy more downlink subframes, then downlink capacity is improved, but interference with uplink subframes from neighboring nodes increases
Solution Approach 1:
The patent applies dynamics by enabling access nodes to dynamically adjust their frame configurations based on real-time traffic conditions and neighboring node states. Access nodes can switch between different frame configuration types (downlink-biased, uplink-biased, or symmetric) and dynamically modify subframe allocations, allowing the network to optimize downlink capacity when needed while automatically adapting to prevent interference with neighboring uplink transmissions
Solution Approach 2:
The patent implements preliminary action through a frame configuration coordination mechanism that proactively identifies and prevents interference scenarios before they occur. The system analyzes traffic patterns, predicts potential interference between downlink and uplink subframes, and pre-adjusts frame configurations or timing relationships to avoid harmful interference, rather than reacting to interference after it occurs
Data Source
AI summary
Interference caused between neighboring access nodes deploying wireless air-interface resources in different frame configurations while using the same frequency sub-band is mitigated by modifying the subframes deployed by a first access node by muting the subframes in the first frame configuration. Wireless resources from a different frequency sub-band can be aggregated towards the interfering subframes. A third access node adjacent to the first access node may deploy wireless resources in the first frame configuration and using the second frequency sub-band. A determination of how to reconfigure the interfering subframes is based on numbers of wireless devices in potential interference zones between each access node.