MU-MIMO UE Selection via Power Class for Spectral Efficiency
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Solution Overview
Problem
Wireless communication systems face challenges in spectral efficiency, particularly in dense urban areas where providing high aggregate throughput with limited spectrum is necessary, leading to the need for innovative methods to increase data capacity without requiring additional air-interface resources.
Innovation Solution
The implementation of massive-MIMO technology with a large antenna array, combined with MU-MIMO configurations, allows for concurrent high-throughput transmissions to multiple UEs using the same air-interface resources, optimizing UE selection based on factors like low BLER, power headroom, power class, mobility, and RF stability to enhance spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If additional licensed spectrum is configured to accommodate subscriber communication needs, then data capacity and throughput are improved, but system cost increases
Solution Approach 1:
The patent combines multiple UEs into a MU-MIMO group, merging their communication streams into the same time-frequency resources. This allows concurrent transmissions to multiple UEs using identical spectrum resources, thereby increasing data capacity without requiring additional licensed spectrum.
Solution Approach 2:
The patent introduces the spatial dimension through multi-antenna transmissions. By transmitting data streams along different spatial paths (layers) to multiple UEs simultaneously, the system achieves higher data capacity in the spatial domain rather than expanding frequency spectrum.
2Productivity
If MU-MIMO service is provided to all UEs, then spectral efficiency is improved, but system complexity increases
Solution Approach 1:
The patent applies MU-MIMO service selectively rather than uniformly to all UEs. By identifying specific UEs with favorable channel conditions (low BLER, suitable power headroom, appropriate power class, low mobility, stable RF conditions), the system achieves high spectral efficiency only where conditions permit, avoiding the complexity of managing MU-MIMO for all UEs.
Solution Approach 2:
The patent changes the operational parameters of selected UEs by configuring them with specific MU-MIMO parameters (downlink MU-MIMO indication, precoding matrix indicators, resource allocations) while leaving other UEs with standard configurations. This selective parameter modification optimizes spectral efficiency without system-wide complexity.
Data Source
AI summary
A method and system for controlling application of MU-MIMO. The disclosure provides for considering a device's power class as a basis to decide whether to provide the device with MU-MIMO service. For instance, a base station could determine which of the base station's served devices that are threshold distant from the base station are each a high power device rather than a lower power device. And on at least that basis, the base station could select each such device to receive MU-MIMO service. Or faced with a choice between devices to receive MU-MIMO service, the base station could compare the devices' power classes and could select the devices that have higher power class to receive MU-MIMO service.