CSI-RS Mechanism Selection for Base Station Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in optimizing Channel State Information Reference Signal (CSI-RS) mechanisms for base stations, leading to suboptimal performance due to interference between beams, especially in densely populated areas where beamformed CSI-RS mechanisms can cause increased interference.
Innovation Solution
A wireless communication device and method that determine the appropriate CSI-RS mechanism based on user equipment distribution profiles, switching between beamformed and non-precoded CSI-RS mechanisms to minimize interference by allocating CSI-RS resources orthogonally and adjusting resource allocation based on user density, ensuring correct CSI report formats are used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beamformed CSI-RS mechanism is adopted to improve channel state information accuracy, then measurement precision is improved, but interference between beams increases causing performance degradation
Solution Approach 1:
The patent dynamically selects between beamformed CSI-RS and non-precoded CSI-RS mechanisms based on user equipment distribution density. When UE density is high, the system switches to non-precoded CSI-RS to reduce interference; when UE density is low, it uses beamformed CSI-RS for better measurement precision. This dynamic adaptation resolves the contradiction by adjusting the CSI-RS mechanism according to real-time network conditions.
Solution Approach 2:
The patent changes the precoding parameter of CSI-RS based on user equipment distribution profile. By modifying the precoding matrix indication (PMI) and selecting appropriate precoding schemes, the system optimizes channel state information measurement while controlling interference levels. This parameter adjustment allows the system to balance measurement precision and interference reduction.
2Measurement precision
If beamformed CSI-RS is used in densely populated areas, then channel state information feedback quality is improved, but resource utilization deteriorates due to increased interference
Solution Approach 1:
The system dynamically adjusts CSI-RS resource allocation and mechanism selection based on user equipment distribution density. In densely populated areas, it switches to non-precoded CSI-RS with adjusted resource allocation to maintain feedback quality while improving resource utilization by reducing harmful interference. This dynamic resource management resolves the contradiction between feedback quality and resource efficiency.
3Device complexity
If a single CSI-RS mechanism is used for all user equipment, then device complexity is reduced, but adaptability deteriorates leading to suboptimal performance in varying user densities
Solution Approach 1:
The patent implements a universal CSI-RS framework that supports both beamformed and non-precoded mechanisms within a single system. The base station can select and switch between different CSI-RS mechanisms based on user equipment distribution profile, providing multi-functionality. This allows the system to maintain low operational complexity while achieving high adaptability to varying user densities through unified resource allocation and mechanism selection.
Data Source
AI summary
A wireless communication device and a wireless communication method. A wireless communication device for use in a base station side includes one or more processors. The processor is configured to obtain a distribution state of a user equipment, and determine to use a channel state information-reference signal (CSI-RS) mechanism based on the distribution state of the user equipment. In addition, the processor is further configured to generate indication information, the indication information being used for indicating to the user equipment the CSI-RS to be used. Besides, the processor is further configured to control to send the CSI-RS to the user equipment according to the CSI-RS mechanism.