Inter-Network Interference Characterization Using Base Station Measurements
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Solution Overview
Problem
Conventional propagation models for predicting inter-network interference in wireless communication networks are conservative, leading to inefficient spectrum sharing among different networks, and there is a lack of actual interference measurement data for effective coordination between base stations of different wireless networks sharing a single spectrum.
Innovation Solution
A technique for characterizing inter-network interference by measuring signal strengths and decoding information from incoming measurement messages at base stations, reporting this data to a back end, and transmitting outgoing measurement messages with measured and decoded information to facilitate accurate frequency assignment by a spectrum controller to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional propagation models are used to predict inter-network interference, then frequency assignment can be performed without actual measurement data, but the spectrum sharing efficiency is reduced due to conservative predictions
Solution Approach 1:
The patent implements a feedback mechanism where base stations measure actual interference levels from other networks and report these measurements to the spectrum controller. The spectrum controller uses this feedback data to refine propagation models and make more accurate frequency assignments, replacing conservative predictions with empirically validated information.
Solution Approach 2:
Base stations autonomously perform interference measurements and generate measurement reports without requiring coordination from other networks. Each network independently collects and shares its own interference data, enabling self-service characterization of inter-network conditions that improves overall spectrum efficiency.
2Measurement precision
If base stations of different wireless networks coordinate transmission time slots for measurement signals, then interference measurement accuracy is improved, but coordination between different networks becomes feasible only with significant system changes
Solution Approach 1:
The spectrum controller acts as an intermediary that collects measurement reports from base stations of different networks and coordinates frequency assignments. Rather than requiring direct coordination between base stations of different networks, the spectrum controller mediates the process by using reported interference data to make centralized scheduling decisions.
Solution Approach 2:
The patent replaces the need for complex mechanical coordination mechanisms (time slot synchronization between networks) with a information-based approach. Base stations transmit measurement signals in their own time slots and report results, allowing the spectrum controller to characterize interference without requiring synchronized transmission timing between different networks.
3Productivity
If more frequency bands are assigned to multiple networks for simultaneous operation, then spectrum utilization efficiency is improved, but inter-network interference increases without accurate measurement data
Solution Approach 1:
The system uses feedback from actual interference measurements to dynamically adjust frequency assignments. When networks share frequency bands, the spectrum controller receives interference measurement data and reassigns frequencies to minimize harmful interactions, enabling efficient spectrum sharing without excessive interference.
Solution Approach 2:
The spectrum controller changes operational parameters (frequency assignments, power levels) based on measured interference conditions. By adjusting these parameters according to actual inter-network interference data rather than conservative predictions, the system achieves higher spectrum utilization while maintaining acceptable interference levels.
Data Source
AI summary
A base station of a wireless network measures signal strengths of incoming measurement messages received by the base station from other base stations and decodes information contained in the incoming measurement messages. For each incoming measurement message, the base station reports information to its network back end, where the reported information includes the measured signal strength of the incoming measurement message and at least some of the decoded information contained in the incoming measurement message. The base station also transmits, to other base stations, outgoing measurement messages containing, for each incoming measurement message, the measured signal strength of the incoming measurement message and at least some of the decoded information contained in the incoming measurement message. In this way, inter-network interference can be characterized and avoided.