Interference Alignment for Virtual Cellular Networks
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Solution Overview
Problem
Existing wireless communication systems face challenges in improving performance through terminal selection and cooperation in virtual cellular networks, where dispersed small base stations and terminals frequently change, leading to increased complexity and feedback requirements.
Innovation Solution
A method and apparatus for interference alignment that involves receiving feedback from terminals, determining optimal terminal allocation and cooperation between base stations, and reducing feedback complexity by allowing partial channel information sharing, enabling real-time terminal selection and cooperation form configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the COMP technique is used to improve terminal performance, then terminal selection and cooperation can be considered, but the amount of feedback increases and the system complexity increases
Solution Approach 1:
The patent extracts only the necessary channel state information (CSI) from the complete feedback set. Instead of requiring full channel matrices from all base stations, the system extracts and uses only the essential CSI needed for interference alignment, significantly reducing feedback overhead while maintaining terminal performance improvement
Solution Approach 2:
The patent applies partial feedback by requesting only specific channel information from terminal to base station. The feedback mechanism uses partial channel state information rather than complete channel matrices, allowing the system to achieve interference alignment without requiring excessive feedback data from all possible base stations
2Reliability
If the COMP technique is used to improve terminal performance, then terminal selection and cooperation can be considered, but the system complexity increases
Solution Approach 1:
The patent extracts and processes only the essential channel state information needed for interference alignment, rather than handling complete channel matrices from all base stations. This extraction approach simplifies the computational burden on terminals and base stations while maintaining the performance benefits of terminal selection and cooperation
Solution Approach 2:
The system uses partial channel state information feedback instead of complete channel knowledge. By requesting and processing only the necessary CSI for interference alignment calculations, the patent reduces the complexity of terminal selection and cooperation determination without sacrificing terminal performance improvement
3Adaptability or versatility
If dispersed small base stations and terminals frequently change, then network adaptability improves, but feedback requirements and selection complexity increase
Solution Approach 1:
The patent implements dynamic terminal allocation where terminals can be reassigned to different base stations based on real-time channel conditions. The interference alignment mechanism dynamically adjusts terminal selection and cooperation configurations, allowing the system to adapt to frequent changes in base station and terminal distribution without requiring comprehensive feedback updates
Solution Approach 2:
The system uses partial channel state information feedback that is sufficient for maintaining interference alignment during dynamic reconfiguration. By using only the necessary CSI for current allocation decisions rather than complete channel matrices, the patent enables rapid adaptation to network changes with reduced feedback overhead
Data Source
AI summary
A method for operating a base station in a wireless communication system is provided. In the method, feedback is received from at least one terminal. When the base station configures terminal allocation information, a terminal that the base station is to service is determined based on information included in the feedback. A combination of base stations allowing the determined terminal to obtain maximal performance is determined with consideration of the information included in the feedback and a gain of cooperation between base stations.