Base Station Interference Avoidance via Bit Mapping
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Solution Overview
Problem
Current technologies lack a method to effectively combine turbo coding with multicarrier communication when interference is present in a frequency band shared with another system, leading to degradation of communication quality.
Innovation Solution
A base station and communication system that selects unused frequency bands with lower interference levels for systematic and parity-bit mapping, using turbo coding and orthogonal frequency division multiplexing to generate and transmit OFDM signals, while a controller manages frequency selection and signal assignment to avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a frequency band shared with another system is used for multicarrier communication, then the productivity of the frequency band is improved, but communication quality deteriorates due to interference from the other system
Solution Approach 1:
The frequency band is segmented into multiple subcarriers, and systematic bits are mapped only to subcarriers with low interference levels while parity bits are mapped to subcarriers with high interference levels. This segmentation allows the system to utilize the entire frequency band for communication while protecting against interference through selective mapping.
Solution Approach 2:
Different parts of the frequency band are assigned different qualities based on interference levels. Subcarriers are categorized into low-interference and high-interference regions, and different bit types (systematic vs. parity) are mapped to different regions according to their error-correcting requirements, optimizing overall communication quality.
2Reliability
If interference monitoring is performed to avoid interference with another system, then reliability is improved, but productivity decreases due to reduced available frequency bands
Solution Approach 1:
The system dynamically adjusts the mapping of systematic and parity bits to subcarriers based on real-time interference levels. The frequency selector identifies subcarriers with varying interference characteristics, and the carrier mapper adaptively assigns bits to appropriate subcarriers, allowing full utilization of the frequency band while maintaining interference avoidance.
Solution Approach 2:
The mapping parameters (which subcarriers receive systematic bits vs. parity bits) are changed based on interference level parameters. When interference conditions change, the system reconfigures the mapping to maintain optimal communication quality while utilizing all available subcarriers.
Data Source
AI summary
A controller is provided that controls a plurality of base stations, each configured to communicate with a mobile station, using some carrier frequencies of a frequency band shared with another system. The controller includes a receiver that receives first frequency information from a first base station in communication with the mobile station, and second frequency information from a second base station, the second base station being a handover destination. The controller also includes a frequency selector that selects a carrier frequency for systematic-bit mapping and a carrier frequency for parity-bit mapping based on the first frequency information and the second frequency information. The controller further includes a signal-assignment-information generator that generates signal assignment information, indicating the carrier frequency for systematic-bit mapping and the carrier frequency for parity-bit mapping, and a transmitter that transmits the signal assignment information to the first and the second base stations.