Subcell Virtual Matrix Precoding for Inter-Cell Interference Reduction
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Solution Overview
Problem
In multi-cellular wireless communication systems, closed-loop MIMO systems face challenges with inter-cell interference and reduced network performance due to dense cell populations and increased data transmission, which complicates network geometry and overhead in handovers.
Innovation Solution
A method is introduced where a Transmission Point in a wireless communication system with multiple sub-cells uses a transmitter, receiver, and controller to determine virtual matrices and select precoding matrices based on uplink control information, enabling cooperative and normal transmission modes to minimize inter-cell interference by adjusting signal transmission across sub-cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If closed-loop MIMO system is used in multi-cellular environment with dense cell population, then data rate and transmission performance are improved, but inter-cell interference increases
Solution Approach 1:
The patent divides a cell into multiple subcells, each with its own dedicated antenna ports and transmission points. This segmentation allows independent transmission control for each subcell, reducing interference between cells while maintaining high data rates through MIMO techniques within each subcell.
Solution Approach 2:
Each subcell is configured with dedicated antenna ports and transmission points specific to that subcell's geographic area. This local quality approach ensures that transmission parameters and antenna resources are optimized for each subcell's specific channel conditions, reducing inter-cell interference while maintaining high transmission performance.
2Device complexity
If same cell ID is assigned to each sub-cell, then control channel sharing is simplified, but inter-cell handover overhead increases
Solution Approach 1:
The patent segments the cell into multiple subcells with dedicated antenna ports, allowing each subcell to be managed independently. This segmentation enables more precise handover control at the subcell level, reducing handover overhead compared to traditional cell-level handovers, while maintaining simplified control channel sharing through the subcell structure.
3Productivity
If number of transmission antennas is increased, then data transmission capacity is improved, but network geometry becomes more complicated
Solution Approach 1:
The patent assigns dedicated antenna ports to each subcell, segmenting the overall antenna system into manageable units. This segmentation allows the network to scale capacity by adding subcells rather than increasing a single complex antenna array, maintaining simpler network geometry while improving overall data transmission capacity through parallel subcell operations.
Data Source
AI summary
A transmission method and apparatus are provided for use in a wireless communication system in which a cell includes a plurality of sub-cells. A Transmission Point (TP) in the wireless communication system includes a transmitter configured to transmit a signal to each of the plurality of sub-cells through a plurality of antennas; a receiver configured to receive uplink control information from a User Equipment (UE) located within at least one of the plurality of sub-cells; and a controller configured to determine a virtual matrix for each of the plurality of sub-cells, to select a precoding matrix according to the virtual matrices of the plurality of sub-cells, to determine a cooperative transmission mode or a normal transmission mode, based on the received uplink control information, and to control the transmitter to perform downlink transmission on a sub-cell basis through the virtual matrices of the sub-cells according to the determined transmission mode.