Dynamic Frequency Hopping Community Channel Optimization
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Solution Overview
Problem
Current Dynamic Frequency Hopping (DFH) systems face inefficiencies in channel usage and interference-free sensing due to the need for strict coordination among WRAN cells, which limits channel efficiency and requires a large number of channels for uninterrupted operations.
Innovation Solution
The formation of a DFH Community where each WRAN cell is a one-hop neighbor of the leader cell, with a determined number of channels for communication, allowing for coordinated channel hopping and mutual interference-free sensing, using a group graph coloring scheme to optimize channel usage, requiring either N+1 or N+2 channels based on community group configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict coordination among WRAN cells is implemented to ensure interference-free sensing, then sensing reliability is improved, but channel efficiency deteriorates and the number of channels required increases
Solution Approach 1:
The system segments WRAN cells into hierarchical communities (one-hop communities and two-hop communities) with designated leader cells. Each community independently coordinates channel hopping patterns under its leader, reducing the coordination overhead and channel requirements compared to system-wide coordination, while maintaining interference-free sensing within each community segment.
Solution Approach 2:
The patent introduces a hierarchical dimension to community organization, where cells form one-hop communities around leader cells, and these communities further organize into two-hop super-communities. This dimensional organization allows efficient resource allocation and coordination at multiple levels, improving channel efficiency while ensuring sensing reliability through layered management.
2Duration of action of moving object
If more channels are allocated for DFH operations, then uninterrupted data transmission is improved, but channel efficiency deteriorates due to underutilization
Solution Approach 1:
The system dynamically adjusts channel hopping patterns and community configurations based on real-time interference conditions and traffic demands. Leader cells compute optimized hopping sequences that adapt to changing channel quality, allowing uninterrupted transmission when needed while efficiently utilizing available channels by reducing the number of channels allocated to each cell based on actual requirements rather than fixed allocations.
Solution Approach 2:
The patent changes key parameters including the number of channels per cell, hopping sequence lengths, and community sizes based on system load and interference conditions. By dynamically adjusting these parameters, the system maintains uninterrupted transmission capability when required while optimizing channel utilization efficiency under varying operational conditions.
3Ease of manufacture
If conventional frequency hopping with random patterns is used, then implementation simplicity is improved, but interference avoidance capability deteriorates
Solution Approach 1:
Leader cells collect interference measurements from member cells and use this feedback to dynamically compute and update channel hopping patterns. The system continuously monitors channel quality metrics and adjusts hopping sequences to avoid interfered frequencies, maintaining simple implementation through centralized pattern generation while significantly improving interference avoidance compared to random hopping.
Solution Approach 2:
Before data transmission begins, leader cells pre-compute optimized channel hopping patterns based on current interference conditions and distribute them to member cells. This preliminary action allows cells to follow predetermined low-complexity hopping sequences that are already optimized for interference avoidance, combining implementation simplicity with enhanced interference avoidance capability.
Data Source
AI summary
A Dynamic Frequency Hopping Community (DFH Community) is formed from a plurality of Wireless Regional Area Network (WRAN) cells wherein each of the plurality of WRAN cells within the DFH Community is a one-hop neighbor of the leader cell. The leader cell sets and distributes a hopping pattern for use among the WRAN cells based on, in part, the number of usable channels and whether a WRAN cell is shared by two groups in the DFH Community.