Dynamic MIMO Mode Assignment via Scattering Coefficient Thresholds
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Solution Overview
Problem
Higher order MIMO modes in wireless communication systems reduce the effective cell radius due to lower power per symbol, leading to a degraded user experience for devices outside the smaller coverage area.
Innovation Solution
A method for dynamically assigning lower order MIMO modes to wireless communication devices based on received scattering coefficients, increasing the effective cell radius by enhancing power per symbol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher order MIMO modes are used, then data throughput is improved, but effective cell radius is reduced
Solution Approach 1:
The patent implements dynamic MIMO mode selection that adapts to changing propagation conditions. The system transitions between higher order MIMO modes (for high throughput in good conditions) and lower order MIMO modes (for extended coverage in poor conditions), making the system flexible rather than fixed. This resolves the contradiction by allowing the system to optimize between throughput and coverage based on real-time scattering conditions.
Solution Approach 2:
The patent changes the MIMO mode parameter based on scattering coefficient measurements. When scattering conditions are favorable, higher order modes are selected for maximum throughput. When scattering conditions deteriorate, the system switches to lower order modes to maintain adequate power per symbol and extend cell radius. This parameter adaptation resolves the contradiction between throughput and coverage area.
2Productivity
If higher order MIMO modes are used, then communication performance is improved, but power per symbol is reduced
Solution Approach 1:
The system dynamically adjusts MIMO mode selection based on measured scattering coefficients. In environments with rich scattering, the system can afford to use higher order modes that distribute power across multiple streams. In environments with poor scattering, the system switches to lower order modes that concentrate power per symbol, ensuring adequate signal strength reaches the cell edge.
Solution Approach 2:
The patent changes the MIMO configuration parameter in response to scattering conditions. Higher order modes (e.g., 8x8 MIMO) are selected when scattering coefficients indicate favorable conditions, while lower order modes are selected when scattering coefficients indicate poor conditions. This parameter change directly addresses the power per symbol constraint while maintaining communication performance.
3Productivity
If higher order MIMO modes are used, then wireless range is reduced, but data throughput is increased
Solution Approach 1:
The patent implements a dynamic MIMO mode selection mechanism that responds to scattering conditions measured by the wireless communication device. When scattering conditions are poor (low scattering coefficient), the system dynamically switches to lower order MIMO modes that provide extended wireless range. When scattering conditions are good, the system dynamically switches to higher order modes that maximize data throughput within the extended range.
Solution Approach 2:
The system changes the MIMO mode parameter based on the scattering coefficient. Lower order modes are selected in low-scattering environments to extend wireless range, while higher order modes are selected in high-scattering environments to maximize throughput. This parameter adaptation resolves the contradiction between range and throughput by allowing both to be optimized in different conditions.
Data Source
AI summary
A wireless access node to facilitate dynamic assignment of multiple-input multiple-output (MIMO) modes comprises a wireless communication transceiver and a processing system. The wireless communication transceiver is configured to receive a scattering coefficient transmitted from a wireless communication device served by the wireless access node. The processing system is configured to compare the scattering coefficient to a scattering threshold, and if the scattering coefficient exceeds the scattering threshold, select a lower order MIMO mode for the wireless communication device and assign the lower order MIMO mode to the wireless communication device.