Cooperative Interference Subtraction via Base Station Channel Translation
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Solution Overview
Problem
Unlicensed users' interference degrades the performance of licensed wireless network base stations, affecting multiple stations and reducing network efficiency, as existing methods struggle to estimate and subtract interference from external interferers.
Innovation Solution
A system and method that detects interference across multiple base stations, calculates a channel translation parameter, and subtracts the interference from received signals using quiet times, allowing for effective interference cancellation even when the channel between the interferer and target base station is unknown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference subtraction is performed using a single base station, then the device complexity is low, but the interference cancellation effectiveness is insufficient when the channel between the interferer and target base station cannot be estimated
Solution Approach 1:
The patent merges the capabilities of multiple base stations by having them cooperate to estimate the channel between the external interferer and the target base station. Base stations share received signal information through the backhaul network, combining their individual channel estimates to achieve a more accurate overall estimate that would be impossible for a single base station to obtain alone.
Solution Approach 2:
The backhaul network serves as an intermediary that enables communication and information exchange between base stations. Through this intermediary channel, base stations share their received signals and channel state information, allowing the target base station to reconstruct the interferer-to-target-channel using measurements from other base stations as intermediaries.
2Productivity
If base stations operate independently without cooperation, then the device complexity is low, but the network performance degradation due to interference affecting multiple base stations is substantial
Solution Approach 1:
The patent segments the interference management task into individual contributions from each base station. Each base station independently measures and estimates the interferer channel from its own received signal, then these segmented estimates are combined through the backhaul network to form a complete interference characterization that protects network-wide performance.
3Measurement precision
If quiet times are scheduled for interference measurement, then the measurement precision of interference signals is improved, but the loss of time for data transmission increases
Solution Approach 1:
The patent applies partial action by having only selected base stations schedule quiet times for interference measurement, rather than requiring all base stations to simultaneously stop data transmission. This partial quiet time approach achieves sufficient interference measurement precision while minimizing the overall impact on network data transmission capacity.
Data Source
AI summary
A cooperative interference subtraction scheme includes receiving a first baseband signal including an interference signal at a first base station, receiving a second baseband signal including the interference signal at a second base station, calculating a channel translation parameter based on the first baseband signal and the second baseband signal, receiving a signal including a user equipment (UE) transmission at the first base station during a first time slot, and subtracting interference from the signal including the UE transmission using the channel translation parameter.