Smart Antenna Data Rate Determination with Interference Compensation
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Solution Overview
Problem
Conventional data rate determining methods in cellular mobile communication systems using smart antennas fail to stably allocate data rates due to time-variant interference from neighbor base stations, leading to decreased successful reception probability.
Innovation Solution
A data rate determining method and apparatus that includes a CQI receiver, an other-cell interference estimator, a power margin calculator, and an SNR corrector to calculate and apply a power margin based on estimated other-cell interference, ensuring a stable data rate by compensating for SNR variations caused by neighbor base station interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If smart antennas are used to concentrate transmit power in specific directions, then data rate for mobile stations is improved, but interference from neighbor base stations becomes time-variant and unstable
Solution Approach 1:
The base station performs preliminary estimation of other-cell interference before determining the data rate. By estimating the interference from neighbor base stations in advance and incorporating it into the SNR calculation, the system proactively compensates for time-variant interference effects, leading to more stable data rate allocation
Solution Approach 2:
The system changes the parameter used for data rate determination from raw SNR to corrected SNR that accounts for other-cell interference. By introducing an interference estimation parameter and using it to adjust the SNR value, the system adapts to time-variant interference conditions while maintaining stable data rate allocation
2Device complexity
If conventional SNR-based data rate determination is used, then implementation is simple, but data rate allocation becomes unstable due to time-variant other-cell interference
Solution Approach 1:
The system introduces an intermediary component (other-cell interference estimator) that mediates between the raw SNR measurement and the final data rate determination. This estimator processes the interference information and provides a corrected SNR value, bridging the gap between simple measurement and stable rate allocation
Data Source
AI summary
A data rate determining method and apparatus in a smart-antenna mobile communication system are provided. A ratio of other-cell interference to AWGN in total noise received at an MS is estimated and a power margin is applied in proportion to highly time-variant other-cell interference. Therefore, despite a change in the other cell interference between a rate decision time and an actual data transmission time, a successful data transmission rate is increased.