Subband and Tx Beam Interference Measurement for MU-MIMO Scheduling
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Solution Overview
Problem
In wireless communication systems, particularly in 5G NR, determining interference for different subbands and transmission beams is challenging when using multi-panel Frequency-Division Multiplexing (FDM) and analog beamforming-based multi-user-multiple input multiple output (MU-MIMO), which affects scheduling efficiency and delay budgets.
Innovation Solution
A UE measures interference on a second subband and second beam direction and reports it to the base station, allowing the base station to schedule communications more effectively by selecting better beams and subbands for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-panel FDM and analog beamforming-based MU-MIMO are used to support multiple UEs, then system capacity and spectral efficiency are improved, but interference measurement and management complexity increases
Solution Approach 1:
The patent segments the interference measurement process by introducing specific resource elements (REs) designated for interference measurement that are separate from data transmission REs. This segmentation allows the UE to measure interference from other UEs on specific REs without being affected by its own data transmission, thereby managing the complexity of interference measurement in multi-panel FDM and MU-MIMO systems while maintaining high system capacity.
2Measurement precision
If interference measurement is performed for every subband and beam combination, then scheduling accuracy is improved, but measurement overhead and processing time increase
Solution Approach 1:
The patent implements preliminary action by pre-configuring specific resource elements for interference measurement purposes before actual data transmission begins. The base station configures the UE with measurement REs in advance, allowing the UE to perform interference measurements efficiently without requiring complex real-time processing for every subband and beam combination, thus reducing measurement overhead while maintaining accuracy.
3Measurement precision
If specific resource elements are allocated for interference measurement, then interference measurement accuracy is improved, but available resources for data transmission are reduced
Solution Approach 1:
The patent introduces specific resource elements as intermediaries that facilitate interference measurement without significantly impacting data transmission capacity. These measurement REs act as mediators that enable accurate interference measurement from other UEs while the majority of other resource elements remain available for data transmission, thus balancing measurement accuracy with resource utilization efficiency.
Data Source
AI summary
Aspects presented herein provide for improved measurement and management of interference for different subbands and different Tx beams for communication with the UEs. A UE may be configured to receive scheduling for communication with a base station in a first beam direction using a first subband. The UE may be configured to measure interference of a second subband for a second beam direction. The UE may be further configured to report the measured interference to the base station. A base station may be configured to schedule communication with the UE in the first beam direction using the first subband. The base station may be further configured to receive the report of interference measured by the UE on the second subband in the second beam direction.