Multi-port DL Receiver UE Capability for MU-MIMO Interference Mitigation
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Solution Overview
Problem
In MU-MIMO systems, UE receivers typically only perform channel estimation on dedicated ports, leading to suboptimal performance due to interference from other ports.
Innovation Solution
The UE measures additional ports beyond its dedicated ports, characterizes interfering streams, and conveys this capability to the gNB, allowing the gNB to modify its beamforming algorithm and relax stream separation requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the UE only measures dedicated ports, then the device complexity is reduced, but the measurement precision and interference mitigation capability deteriorate
Solution Approach 1:
The UE performs channel estimation on more ports than the minimum dedicated ports required by the system. By measuring additional ports beyond the dedicated set, the UE obtains partial information about interfering streams without requiring full measurement of all system ports, thus balancing complexity and precision.
Solution Approach 2:
The UE performs channel estimation on additional ports in advance before actual data reception. This preliminary measurement allows the UE to characterize interfering streams beforehand, enabling better interference mitigation during data demodulation without adding real-time processing complexity.
2Reliability
If the gNB maintains strict stream separation requirements, then the reliability of MU-MIMO transmission is improved, but the cell throughput and system efficiency deteriorate
Solution Approach 1:
The UE feeds back capability information to the gNB indicating its ability to measure additional ports and characterize interference. The gNB uses this feedback to adjust its beamforming algorithm and stream separation requirements, relaxing constraints when the UE demonstrates sufficient interference mitigation capability, thus improving throughput while maintaining reliability.
Solution Approach 2:
The stream separation requirements are made dynamic rather than static. The gNB adjusts the separation requirements based on the UE's measured capability and current channel conditions. When the UE can effectively characterize and mitigate interference, the gNB relaxes separation requirements to allow more aggressive spatial multiplexing and higher throughput.
3Reliability
If the UE characterizes interfering streams from additional ports, then the interference mitigation performance is improved, but the processing complexity and energy consumption increase
Solution Approach 1:
The UE changes the parameter of measurement scope by selectively measuring additional ports based on configuration and capability. Rather than continuously measuring all possible ports, the UE adjusts the number and type of additional ports measured based on system configuration and channel conditions, optimizing the balance between interference mitigation performance and processing energy.
Data Source
AI summary
A method is disclosed for enhancing the performance of a Multi-User Multiple Input Multiple Output (MU-MIMO) system, comprising: measuring, by a User Equipment (UE), a plurality of ports including dedicated ports and additional ports beyond the dedicated ports; characterizing, by the UE, interfering streams based on the measurements of the additional ports; and sending, from the UE, a message to a gNB to relax stream separation requirements, thereby increasing cell throughput and efficiency.