Base Station MU-MIMO UE Grouping by Primary Carrier Orthogonality
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Solution Overview
Problem
In wireless communication systems, accurately determining the orthogonality of UEs served on different carriers for MU-MIMO service is challenging when communication is bi-directional on the primary carrier but downlink-only on secondary carriers, leading to potential errors in spectral efficiency optimization.
Innovation Solution
A base station groups UEs for MU-MIMO service based on their shared primary carrier, prioritizing those served on the same primary carrier to ensure accurate angular separation and optimize spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs served on different carriers are grouped for MU-MIMO service, then the number of UEs served increases, but the accuracy of orthogonality determination deteriorates
Solution Approach 1:
The patent segments the UE grouping process by primary carrier, creating separate MU-MIMO groups for UEs sharing the same primary carrier. This segmentation ensures that orthogonality determination is performed within homogeneous carrier groups, maintaining measurement precision while still serving multiple UEs through structured grouping across different carrier segments.
Solution Approach 2:
The patent applies local quality by requiring that UEs within each MU-MIMO group share the same primary carrier characteristics. This ensures that each group has uniform local properties (same primary carrier) that enable accurate orthogonality determination, while different groups may have different characteristics suited to their respective carriers.
2Productivity
If UEs with different primary carriers are grouped together, then resource utilization increases, but spectral efficiency optimization deteriorates
Solution Approach 1:
The patent segments resource allocation by creating distinct MU-MIMO groups based on primary carrier membership. This segmentation allows the system to maintain reliable spectral efficiency optimization within each carrier-specific group while still achieving high overall resource utilization through coordinated allocation across multiple segmented groups.
Solution Approach 2:
The patent changes the grouping parameter from carrier-agnostic to primary-carrier-specific. By making the primary carrier a defining parameter for group formation, the system ensures that spectral efficiency optimization can be reliably performed within each group while resource utilization is maintained through the creation of multiple such groups.
3Productivity
If carrier aggregation is used to serve more UEs, then system capacity increases, but the complexity of UE grouping management increases
Solution Approach 1:
The patent reduces management complexity by applying local quality principles - each MU-MIMO group is formed with UEs sharing the same primary carrier, creating homogeneous groups that are simpler to manage. This local homogeneity simplifies the grouping management process while the aggregation of multiple such groups maintains high system capacity.
Solution Approach 2:
The patent simplifies grouping management by changing the key parameter from considering all carrier combinations to focusing solely on primary carrier identity. This parameter change dramatically reduces the complexity of grouping management while maintaining system capacity through the formation of multiple primary-carrier-based groups.
Data Source
AI summary
When a base station is serving a plurality of devices on a common carrier and the base station is considering which subset of the UEs to group together with each other for MU-MIMO service, the base station could base the decision on a determination of whether the base station is serving the UEs of the subset on a common primary carrier. Or faced with a choice of which subset of UEs to group together with each other for MU-MIMO service, the base station could give priority to grouping UEs that the base station is serving on a common primary carrier, as compared with UEs that the base station is serving on a common carrier but not on a common primary carrier.