Interference Alignment via Selective Feedback in Base Stations
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Solution Overview
Problem
In communication systems with multiple base stations, interference between stations using the same radio resource leads to decreased throughput, and existing interference control and alignment technologies increase system overhead.
Innovation Solution
Implementing an interference recognition unit and precoding matrix generation in neighboring base stations to recognize and align interference channels, with user selection based on feedback information, and using random beamforming to minimize overhead while maintaining throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interference control technology or interference alignment technology is implemented, then interference is mitigated and radio resource efficiency is enhanced, but system overhead increases
Solution Approach 1:
The patent applies partial action by having only a portion of user groups feed back interference channel information while another portion feeds back throughput information. This selective approach allows interference alignment to be performed only where necessary, reducing overall system overhead while still achieving interference mitigation in critical scenarios
Solution Approach 2:
Different user groups are assigned different feedback strategies based on local conditions. Some user groups experience severe interference and require full interference channel feedback for alignment, while others experience less interference and can use simplified throughput-based feedback, optimizing the balance between performance and overhead
2Reliability
If all user groups feed back interference channel information for interference alignment, then interference mitigation performance is improved, but feedback overhead increases
Solution Approach 1:
Instead of requiring all user groups to provide full interference channel information, the patent implements partial feedback where only a subset of user groups feed back interference channel details while others provide simplified throughput metrics. This reduces feedback overhead while maintaining adequate interference mitigation performance
3Reliability
If interference alignment is performed without user selection, then interference cancellation is improved, but system complexity and overhead increase
Solution Approach 1:
The patent segments user groups into different categories based on their interference conditions and feedback capabilities. By dividing the user population into those requiring full interference alignment and those sufficient with throughput-based selection, the system reduces overall complexity while maintaining effective interference cancellation for those who need it
Data Source
AI summary
A communication system may include a serving base station and neighboring base stations. Each of the serving base station and the neighboring base stations may have a corresponding user group. Terminals belonging to a particular user group may feed back information associated with interference channels, and reasonably generate a precoding matrix. Through this, it is possible to perform an accurate interference alignment and to enhance a throughput. In this instance, terminals belonging to the other user groups may feed back information associated with a throughput, and a corresponding base station may perform the interference alignment using a user selection resulting in decreased overhead.