MIMO Coordinated Rank Feedback for Inter-Cell Interference
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Solution Overview
Problem
In MIMO communication systems, terminals near cell edges experience interference from neighboring base stations, leading to reduced communication performance due to the lack of coordination between cells, which results in inefficient precoding and increased feedback overhead.
Innovation Solution
A method is introduced where a target terminal determines a preferred rank for its serving base station and a coordinated rank for interfering neighbor base stations, transmitting this information to minimize interference and enhance performance, involving the exchange of recommended or restricted ranks and associated performance expectations between base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If cells do not cooperate with each other, then device complexity is reduced, but communication performance deteriorates due to increased inter-cell interference
Solution Approach 1:
The patent extracts only the essential rank information from the full channel state information and feeds back only this coordinated rank information to the base station. This selective extraction reduces the feedback overhead and complexity while enabling effective interference coordination through the exchanged rank indicators between neighboring base stations.
2Reliability
If more detailed channel information is fed back, then communication performance is improved, but feedback overhead increases
Solution Approach 1:
The terminal extracts and feeds back only the coordinated rank information rather than the complete channel state information. This selective feedback mechanism reduces the amount of data transmitted while maintaining the necessary information for the base station to perform effective precoding and manage inter-cell interference.
Solution Approach 2:
The patent changes the parameter being fed back from full channel state information to a simplified rank indicator. This parameter transformation reduces the feedback overhead significantly while preserving the essential information needed for interference coordination and precoding optimization.
3Object-affected harmful factors
If rank information is exchanged between base stations, then inter-cell interference is reduced, but device complexity increases
Solution Approach 1:
The terminal provides feedback on the coordinated rank information to the base station, which then uses this information to adjust its precoding strategies. This feedback mechanism enables the base station to coordinate with neighboring cells effectively, reducing inter-cell interference through iterative optimization based on the exchanged rank indicators.
Data Source
AI summary
Provided is a multiple input multiple output (MIMO) communication method and system that may exchange information associated with a coordinated rank for a neighbor cell. In a MIMO communication system, a target terminal may feed back the information associated with the coordinated rank to a serving base station, and the serving base station may exchange the information associated with the coordinated rank with the neighbor base station. The serving base station may perform precoding based on the exchanged information associated with the coordinated rank.