Adaptive Cell Regioning for ICI Reduction in HDD Relay Systems
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Solution Overview
Problem
In conventional communication systems using Relay Stations (RSs) in Hybrid Division Duplex (HDD)-based systems, Inter-Carrier Interference (ICI) occurs due to different synchronizations between Base Stations (BS) and Mobile Stations (MS), leading to decreased system performance.
Innovation Solution
The method involves determining the location of a Mobile Station (MS) within a cell's inner or outer region and adaptively applying a Hybrid Division Duplex scheme, using different frequency reuse factors and duplex schemes between the BS and RS, to minimize ICI interference by separating transmission/reception bands and allocating resources accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different transmission paths are used for MSs in a cell (direct and via Relay Station), then coverage and connectivity are improved, but synchronization offsets occur causing ICI interference
Solution Approach 1:
The patent segments the cell into inner and outer regions with different frequency reuse factors. The inner region uses a higher frequency reuse factor while the outer region uses a lower frequency reuse factor, allowing different transmission paths to be managed separately and reducing synchronization offset effects across the entire cell.
Solution Approach 2:
The patent applies different frequency reuse factors to different regions of the cell. The inner region near the base station uses one frequency reuse factor while the outer region uses another, optimizing the frequency allocation locally for each region's specific interference characteristics and synchronization requirements.
2Object-affected harmful factors
If frequency reuse factor is increased to reduce interference between adjacent cells, then interference is reduced, but available bandwidth is decreased
Solution Approach 1:
The patent applies different frequency reuse factors to different regions of the cell. The inner region uses a higher frequency reuse factor to reduce interference near the base station, while the outer region uses a lower frequency reuse factor to maximize bandwidth availability where interference is less severe, thus optimizing the trade-off locally.
Solution Approach 2:
The patent divides the cell into inner and outer regions with different frequency reuse strategies. This segmentation allows the system to optimize interference reduction in the inner region while preserving bandwidth in the outer region, achieving a balance between interference reduction and bandwidth utilization.
Data Source
AI summary
A method and apparatus for transmitting and receiving data in a Base Station (BS) of a communication system are provided. A controller determines a location of a Mobile Station (MS), and determines a transmission/reception scheme for data transmission and reception to/from the MS according to the location of the MS. A transceiver transmits and receives data to/from the MS using the determined transmission/reception scheme. Preferably, the MS is located in any one of a cell's inner region and a cell's outer region, the cell's inner region has a radius which varies according to interference between adjacent cells, and the cell's outer region is a region defined by excepting the cell's inner region from the entire cell region.