Intelligent CSI Selection for MIMO Interference Management
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Solution Overview
Problem
In 3GPP LTE downlink MIMO transmission modes, user equipment (UEs) feedback CSI to maximize their own throughput, but this does not necessarily maximize overall system throughput due to varying interference levels among UEs, especially with MIMO vertical tilting, which complicates beam coordination and increases system complexity.
Innovation Solution
A system and method where UEs select CSI values considering both their own throughput and the interference impact on other devices, using statistical interference information to optimize feedback without real-time message exchange, and employing artificially generated interference impact values to simplify implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs feedback CSI to maximize their own throughput, then individual UE throughput is improved, but overall system throughput is not maximized due to varying interference levels
Solution Approach 1:
The patent implements a feedback mechanism where UEs report interference measurements to the network, and the network uses this feedback to adjust downlink transmissions. The UE measures interference from different CSI values and feeds this information back, enabling the network to make informed decisions about which CSI values to use for downlink transmissions, thus resolving the conflict between individual throughput maximization and system-wide optimization
Solution Approach 2:
The patent performs preliminary interference measurements and evaluations before actual data transmission occurs. The UE measures interference levels for different potential CSI values in advance, and the network pre-determines optimal transmission parameters based on these measurements, allowing the system to avoid harmful interference in real-time without requiring complex real-time coordination
2Object-affected harmful factors
If MIMO vertical tilting with different down tilt beam angles is used, then coverage and interference management are improved, but beam coordination complexity increases
Solution Approach 1:
The patent enables each UE to independently measure and report interference characteristics for different beam angles and CSI values. Each UE performs self-measurement of interference levels without requiring coordination with other UEs or the network, simply by measuring the actual interference from different transmission configurations. This self-service approach eliminates the need for complex multi-UE coordination while still achieving effective interference management
Solution Approach 2:
The patent introduces interference measurements as an intermediary parameter that bridges the gap between beam configuration and throughput optimization. Instead of directly coordinating beams across multiple UEs, the system uses measured interference values as an intermediary to infer the impact of different beam angles, simplifying the coordination process while maintaining effective interference control
3Measurement precision
If real-time interference measurements are performed for all CSI values, then accurate interference information is obtained, but measurement time and system overhead increase
Solution Approach 1:
The patent applies partial measurement by having UEs measure interference for only a subset of CSI values rather than all possible values. The UE measures interference for the current and a few neighboring CSI values, which provides sufficient accuracy for optimization without requiring exhaustive measurement of all possibilities, thus reducing measurement time while maintaining practical accuracy
Solution Approach 2:
The patent performs interference measurements in advance during dedicated measurement periods rather than during actual data transmission. By conducting preliminary measurements when the channel is relatively stable, the system obtains accurate interference information without delaying actual throughput-critical transmissions, effectively separating measurement time from data transmission time
Data Source
AI summary
A method for providing feedback information includes receiving a configuration of a plurality of offset values, determining the feedback information in accordance with at least one measurement made by a user equipment and with the plurality of offset values, and sending the feedback information to a network controller.