Heterogeneous Network Interference Mitigation via Channel Measurement
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Solution Overview
Problem
In heterogeneous wireless communication networks, co-channel interference between picocells, femtocells, and relay nodes limits the throughput of user equipment (UE) due to simultaneous signal transmission and reception in overlapping bandwidths, hindering the benefits of reduced power consumption and improved signal quality.
Innovation Solution
A method for resource arrangement in wireless communication systems that involves obtaining channel information through measurement or feedback from relay nodes or second base stations, allowing for the identification of optimal resource blocks to minimize interference by arranging them according to channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heterogeneous network with picocells, femtocells and relay nodes is deployed to reduce transmission distance and improve signal quality, then signal quality and power consumption are improved, but co-channel interference increases due to simultaneous signal transmission in overlapping bandwidths
Solution Approach 1:
The patent segments the bandwidth into multiple resource blocks and divides them into different resource block groups. Different cell types (macrocell, picocell, femtocell, relay node) are assigned to different resource block groups, so they transmit signals in different frequency resources simultaneously. This segmentation eliminates co-channel interference while allowing all nodes to operate concurrently, maintaining improved signal quality and power consumption benefits.
2Productivity
If resource blocks are allocated without channel measurement, then resource allocation is simple, but interference mitigation is ineffective and UE throughput is limited
Solution Approach 1:
The patent performs channel measurement and determines channel quality indicators (CQI) for each resource block before allocating resources to UEs. The base station measures channel conditions in advance, divides resource blocks into groups based on channel quality, and then allocates appropriate resource block groups to UEs. This preliminary action ensures that UEs receive resources with optimal channel conditions, maximizing throughput while the structured approach keeps complexity manageable.
Solution Approach 2:
The patent changes the parameter of resource block allocation from uniform allocation to quality-based allocation. By measuring channel quality and using CQI values to determine which resource block groups to allocate to which UEs, the system adapts resource allocation to actual channel conditions. This parameter change enables effective interference mitigation and throughput improvement without excessive complexity.
Data Source
AI summary
A method of handling resource arrangement for a first base station of a wireless communication system is disclosed. The method comprises obtaining channel information of a channel corresponding to a resource block from a measurement, a relay node of the wireless communication system or a second base station of the wireless communication system, wherein the resource block is identified by a time period and a frequency bandwidth; and arranging the resource block to a mobile device in the wireless communication system according to the channel information of the channel.