Virtual Transmission Ports for Multi-Cell Wireless Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In multi-cell wireless communication systems, interference between cells degrades performance, especially for mobile stations at the edge of cells, due to uncoordinated channel state information and shared cell identifiers, leading to reduced network geometry and increased overhead during handovers.
Innovation Solution
A method for a base station with multiple sub-cells to configure virtual transmission ports, allowing for different or shared use of these ports between sub-cells, and classify transmission modes based on signal intensity and channel state to optimize data transmission, including MIMO/SIMO, cooperative, and general transmission modes, ensuring efficient data delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same cell identifier is allocated to sub-cells in multiple cell environments, then device complexity is reduced, but interference between cells increases and network geometry is degraded
Solution Approach 1:
The patent segments the cell identifier space by introducing a sub-cell identifier that works in conjunction with the cell identifier. This segmentation allows different sub-cells to be uniquely identified while their parent cells share common identifiers, reducing complexity at the cell level while maintaining distinguishability at the sub-cell level to avoid interference.
Solution Approach 2:
The patent applies local quality by allowing cell identifiers to be shared at the cell level while introducing differentiated sub-cell identifiers for specific sub-cells. This creates a hierarchical identification system where the same identifier can be used in different contexts (cell level) while maintaining local uniqueness (sub-cell level) to prevent interference.
2Productivity
If sub-cells are densely arranged to increase data capacity, then productivity is improved, but interference between cells increases and network geometry is decreased
Solution Approach 1:
The patent segments the transmission system into multiple sub-cells with unique sub-cell identifiers, allowing dense arrangement of sub-cells to increase data capacity while maintaining the ability to distinguish and manage individual sub-cells through their identifiers, thereby controlling interference through precise identification and coordination.
3Adaptability or versatility
If handover between densely arranged cells is implemented, then adaptability is improved, but overhead increases and performance deteriorates
Solution Approach 1:
The patent segments the identification system into cell-level and sub-cell-level identifiers, allowing handover decisions to be made at the sub-cell level within the same cell. This reduces the frequency and complexity of inter-cell handovers, thereby reducing overhead while maintaining adaptability through fine-grained sub-cell level mobility management.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a method and apparatus for transmitting data in a wireless communication system for supporting multi-cells formed of a plurality of sub-cells. The method includes the steps of: connecting at least one virtual transmission port to each of the plurality of sub-cells; determining the transmission mode for a terminal on the basis of channel states between at least two of the plurality of sub-cells and the terminal; and transmitting data for each sub-cell to the terminal through at least one virtual transmission port connected to a corresponding sub-cell on the basis of the determined transmission mode.