Coordinated Precoding Matrix Index Allocation for MIMO Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In MIMO communications systems, the distributional method for restricting precoding matrix indexes between base stations leads to conflicts and repeated determinations, causing interference between cells.
Innovation Solution
A telecommunication method where communications terminals decide precoding matrix indexes based on channel quality information, transmit feedback to serving base stations, and compare priority factors with neighboring base stations to selectively restrict or accept precoding matrix usage, preventing interference without unconditional limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a decentralized method is used to restrict precoding matrix indexes between base stations, then interference between cells can be prevented, but conflicts and repeated determinations occur causing system complexity to increase
Solution Approach 1:
The patent introduces a coordinator base station that acts as an intermediary to manage precoding matrix index restrictions. Instead of direct peer-to-peer coordination between all base stations, the coordinator collects channel quality information from communications terminals and makes centralized decisions about precoding matrix index restrictions, thereby reducing the complexity of distributed coordination while maintaining interference prevention capabilities
Solution Approach 2:
The patent changes the coordination parameter from distributed mutual restriction to centralized priority-based allocation. The coordinator base station determines priority factors based on channel quality information and service requirements, then allocates precoding matrix indexes accordingly. This parameter change transforms the coordination mechanism from a complex distributed system to a simpler centralized control system
2Object-affected harmful factors
If base stations continuously repeat determination and proposal of precoding matrix indexes, then interference can be managed, but communication efficiency deteriorates due to repeated exchanges
Solution Approach 1:
The patent implements preliminary action by having the coordinator base station proactively determine and notify precoding matrix index restrictions to neighboring base stations before actual data transmission occurs. This advance coordination eliminates the need for continuous repeated exchanges during communication, as base stations can proceed with predetermined precoding matrix selections, thereby improving communication efficiency while maintaining interference management
Solution Approach 2:
The patent establishes a feedback mechanism where communications terminals report channel quality information to the coordinator base station, which then makes informed decisions about precoding matrix index allocations. This feedback-based approach ensures that interference management decisions are based on current channel conditions rather than requiring continuous repeated negotiations, thus improving communication efficiency
Data Source
AI summary
In the communications system of the present invention, a communications terminal determines a precoding matrix index in a pilot signal received through a specific downlink channel, examines channel quality information of the downlink channel according to the determined precoding matrix index, and transmits feedback information to a serving base station, which determines a priority factor by using the examined channel quality information, and compares the priority factor with other priority factors. The comparison is used such that a base station having a high priority suggests the use of the precoding matrix to the neighboring base station.