Multi-Carrier Base Station Interference Mitigation via Adaptive MCS
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Solution Overview
Problem
In multicarrier communication systems, interference from neighboring cells can hinder the effectiveness of maximum ratio combining, leading to suboptimal signal quality and reduced transmission rates, especially when repetition is used in radio communication base stations and mobile stations.
Innovation Solution
The implementation of a radio communication base station apparatus that includes a repetition section, a modulation and coding scheme control section, and a transmission section, which adjusts the modulation level and coding rate of symbols to enable effective interference mitigating symbol combining by matching the repetition of desired and interfering waves, thereby preventing a decrease in transmission rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetition is performed to improve signal quality, then received quality is improved, but transmission rate decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the modulation and coding scheme (MCS) based on the repetition factor. When repetition is performed to improve signal quality in high interference environments, the system compensates by increasing the coding rate or modulation level, thereby maintaining transmission rate while achieving the reliability improvement from repetition.
2Object-affected harmful factors
If maximum ratio combining is performed to suppress interference, then interference is suppressed, but required quality is not achieved near cell boundaries
Solution Approach 1:
The patent implements feedback by having the mobile station report its location information to the base station, which then determines whether to perform repetition based on the reported location. This feedback mechanism enables the system to adaptively apply repetition only when needed (near cell boundaries with high interference), thereby achieving effective interference suppression while maintaining required signal quality.
Solution Approach 2:
The patent applies dynamics by making the repetition decision adaptive rather than static. The base station dynamically determines whether to perform repetition based on real-time location information and interference conditions, allowing the system to optimize between interference suppression and signal quality requirements in different operational scenarios.
3Reliability
If repetition is performed in base station, then received quality is improved, but transmission rate decreases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the modulation and coding scheme (MCS) based on the repetition factor. When repetition is performed to improve signal quality in high interference environments, the system compensates by increasing the coding rate or modulation level, thereby maintaining transmission rate while achieving the reliability improvement from repetition.
Data Source
AI summary
There is provided a mobile station device capable of effectively performing interference suppression symbol synthesis while suppressing the lowering of the transfer rate when using the repetition technique in multi-carrier communication. In the mobile station device (100), when the interference level exceeds a threshold value, a switching control unit (110) controls a switch (109) to connect a P/S unit (106) to a weight multiplication unit (113) and controls a switch (111) to connect a channel estimation unit (108) to a weight calculation unit (112). The weight calculation unit (112) calculates an interference suppression weight based on MMSE from a pilot symbol and a channel estimation value. The weight multiplication unit (113) multiplies a data symbol by the interference suppression weight. A synthesis unit (114) synthesizes the data symbol multiplied by the interference suppression weight in repetition unit.