Macro Base Station Codebook Segmentation for Inter-Cell Interference Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems with femto cells, inter-cell interference is challenging to mitigate due to increased complexity and backhaul information exchange requirements, especially as the number of adjacent cells grows, leading to inefficiencies in interference management.
Innovation Solution
The method involves restricting codebooks for beamforming by resource block in macro Base Stations (BS) and Mobile Stations (MS), determining available resource blocks based on interference, and performing iterative power control using feedback information to minimize inter-cell interference without relying on backhaul information exchange between macro and femto BSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordination techniques (CA-BF or PMI) are used to mitigate inter-cell interference, then interference mitigation performance is improved, but device complexity and backhaul information exchange requirements increase
Solution Approach 1:
The codebook is segmented into multiple codebook sets, each associated with specific resource blocks. The macro BS restricts the codebook available by resource block, assigning different codebook sets to different resource blocks to reduce interference to femto cells. This segmentation allows interference mitigation without requiring complex coordination between macro and femto BSs.
2Adaptability or versatility
If the number of adjacent cells increases to provide femto-cell service, then service coverage is improved, but the amount of information feedback from MS and information exchange between BSs increases
Solution Approach 1:
Different codebook sets are assigned to different resource blocks based on local interference conditions. The macro BS determines which codebook sets are available by resource block, allowing localized interference management. This approach enables the system to support multiple femto cells without requiring global information exchange about all adjacent cells.
Data Source
AI summary
An apparatus and method for mitigating inter-cell interference in a macro Base Station (BS) of a wireless communication system having at least one femto cell are provided. The method includes restricting the use of at least one code among at least one available code when forming a beam by resource block, constructing a codebook set for each resource block, when feedback information is received from at least one Mobile Station (MS), allocating a resource to the MS in consideration of the feedback information, determining a weight for forming a beam to the MS in consideration of the codebook set for each resource block and the resource allocated to the MS, and forming the beam to the MS using the weight.