Adaptive Multiplexing Mode Selection for Inter-Cell Interference Reduction
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Solution Overview
Problem
Existing communication systems face high inter-cell interference and system complexity when implementing spectrum multiplexing, particularly when using frequency domain mitigation methods, which affects the reliability of channel detection and resource utilization.
Innovation Solution
A method for adaptive selection of multiplexing modes based on interference strength, switching between code division multiplexing (CDM) and other modes like orthogonal frequency division multiplexing (OFDM), single carrier frequency division multiple access (SC-FDMA), frequency division multiplexing (FDM), or time division multiplexing (TDM), to optimize signal transmission according to interference thresholds, thereby reducing inter-cell interference and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency domain mitigation method is applied to reduce inter-cell interference, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent applies dynamic selection of multiplexing modes (CDM, OFDM, SC-FDMA, FDM, TDM) based on real-time interference strength measurements. The system transitions from static frequency domain mitigation to dynamic mode selection, adapting the multiplexing approach according to current channel conditions and interference levels, thereby reducing complexity while maintaining interference reduction benefits
Solution Approach 2:
The system changes the parameter of multiplexing mode selection based on interference strength thresholds. When interference exceeds the first threshold, CDM mode is selected; otherwise, other modes (OFDM, SC-FDMA, FDM, or TDM) are used. This parameter-based adaptation allows the system to optimize between interference reduction and complexity based on actual conditions
2Object-affected harmful factors
If time domain mitigation method is applied to reduce inter-cell interference, then interference is reduced, but system complexity increases
Solution Approach 1:
The patent implements dynamic multiplexing mode selection that adapts between time domain (TDM) and frequency domain (OFDM, SC-FDMA, FDM) approaches based on interference conditions. Rather than permanently committing to time domain mitigation with its associated complexity, the system dynamically selects the appropriate domain based on real-time measurements, reducing overall system complexity while maintaining interference reduction capability
Solution Approach 2:
The system uses interference strength as a parameter to determine whether to apply time domain or frequency domain multiplexing. When interference is high, TDM mode is selected; when interference is low, frequency domain modes are used. This parameter-driven approach optimizes the trade-off between interference reduction and system complexity
3Productivity
If spectrum multiplexing is applied between low-power eNodeB and macro eNodeB, then spectrum utilization efficiency is improved, but inter-cell interference increases
Solution Approach 1:
The patent enables dynamic adaptation of multiplexing modes based on interference feedback from both the cell and neighboring cells. This dynamic approach allows the system to maintain spectrum multiplexing benefits while adapting to varying interference conditions, thereby improving spectrum utilization efficiency without permanently suffering from high inter-cell interference
Solution Approach 2:
The system implements feedback mechanisms where interference strength is measured and reported from both the transmitting cell and neighboring cells. This feedback drives the selection of appropriate multiplexing modes, allowing the system to optimize spectrum utilization while actively managing and reducing inter-cell interference through informed decision-making
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AI summary
A method, a device and a system for signal transmission are disclosed in embodiments of the present invention. The method comprises: selecting a multiplexing mode of signals to be transmitted by a cell according to interference strength received by the cell and/or interference strength received by a neighboring cell; notifying a receiver of the multiplexing mode of the signals to be transmitted by the cell; and transmitting the signals to be transmitted by the cell according to the multiplexing mode of the signals to be transmitted by the cell. Through the signal transmission method, device and system provided herein, the multiplexing mode is selected adaptively according to the interference strength. Therefore, the inter-cell interference is reduced, the reliability of channel detection is improved, the system complexity is reduced, and the cost is saved.