Base Station Carrier Aggregation Control for MU-MIMO Spectral Efficiency
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Solution Overview
Problem
In wireless communication systems, high air-interface resource utilization and serving many users lead to sub-optimal spectral efficiency due to the inability to include devices in MU-MIMO groups on secondary component carriers, resulting in inefficient use of air-interface resources.
Innovation Solution
Disabling carrier-aggregation service when a base station serves a threshold quantity of users and has high air-interface resource allocation, allowing for the use of air-interface resources for MU-MIMO service instead of secondary component carriers, thereby improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier-aggregation service is enabled to increase data capacity for users, then user throughput is improved, but spectral efficiency deteriorates due to inability to include devices in MU-MIMO groups on secondary component carriers
Solution Approach 1:
The base station dynamically switches between carrier aggregation mode and MU-MIMO mode based on real-time system conditions. When the number of connected devices exceeds a threshold, the system transitions from carrier aggregation to MU-MIMO, enabling adaptive resource allocation that optimizes spectral efficiency while maintaining user throughput.
Solution Approach 2:
The system changes the operational parameters of the base station by adjusting the maximum number of component carriers allowed per device. When spectral efficiency becomes sub-optimal, the base station reduces the number of active component carriers for certain devices, thereby enabling MU-MIMO group formation and improving overall spectral efficiency.
2Quantity of substance
If the base station serves a large number of connected-mode devices, then user coverage is improved, but spectral efficiency deteriorates due to high air-interface resource allocation
Solution Approach 1:
The base station implements dynamic mode switching that responds to the number of connected devices. When the device count exceeds a predefined threshold, the system automatically transitions from carrier aggregation to MU-MIMO operation, enabling efficient handling of large numbers of devices while maintaining spectral efficiency.
Solution Approach 2:
The system continuously monitors the number of connected-mode devices and adjusts its operational mode accordingly. This feedback mechanism enables the base station to detect when spectral efficiency becomes sub-optimal and trigger a mode switch to MU-MIMO, ensuring optimal performance as device density increases.
Data Source
AI summary
In accordance with the disclosure, when a base station is serving at least a threshold quantity of devices and the base station is allocating at least a threshold quantity of its air-interface resources per unit time, the base station will disable carrier-aggregation service, so as to help minimize or eliminate instances where the base station's carriers would be used as secondary component carriers for carrier-aggregation service and would not support MU-MIMO service. By disabling carrier-aggregation service in that scenario, air-interface resources that might otherwise have been used for secondary-component-carrier transmission without MU-MIMO service may then instead be available for use with MU-MIMO service, which may help to improve spectral efficiency.