Precoding Matrix Combination for Inter-Cell Interference Reduction
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Solution Overview
Problem
In multi-input multi-output (MIMO) communication systems, the use of multiple antennas can lead to inter-cell interference due to the formation of beams, which existing technologies have not effectively addressed.
Innovation Solution
A precoding method and apparatus that involves determining a first codeword to maximize transmission power and a second codeword to minimize interference, with a combination ratio used to generate a transmission precoding matrix, which is transmitted to a terminal for uplink data transmission, thereby reducing inter-cell interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a beam is formed according to a precoding matrix when multiple antennas are used, then data transmission direction is controlled, but inter-cell interference is caused
Solution Approach 1:
The system dynamically selects between different precoding matrices (first and second codewords) based on real-time channel conditions and interference requirements. The precoding matrix is not fixed but adapts to maximize transmission power while minimizing inter-cell interference through dynamic switching and combination.
Solution Approach 2:
The invention changes the parameters of the precoding matrix by combining multiple codewords with different weighting factors. The system adjusts the combination ratio of the first and second precoding matrices to optimize the balance between transmission power and interference reduction, effectively controlling the beamforming characteristics.
2Power
If a precoding matrix is used to maximize transmission power, then transmission efficiency is improved, but interference to neighboring base station increases
Solution Approach 1:
The invention merges two different precoding matrices (first codeword for maximum power and second codeword for minimum interference) into a combined precoding matrix. This combination allows the system to simultaneously achieve both high transmission power and reduced interference by weighting the contributions of both matrices appropriately.
Solution Approach 2:
The system creates a composite precoding matrix that integrates the characteristics of multiple codewords. This composite structure combines the power-enhancing properties of the first codeword with the interference-reducing properties of the second codeword, achieving a balanced performance profile.
Data Source
AI summary
To control precoding of a terminal in a serving base station, a first codeword that maximizes transmission power of the serving base station is determined by a codebook, and an index of a second codeword that minimizes interference to the neighboring base station is transmitted from the neighboring base station. The serving base station transmits an index of the first codeword, an index of the second codeword, and a combination ratio of a precoding matrix corresponding to the index of the first codeword and a precoding matrix corresponding to the index of the second codeword to the terminal.