Interference Management for Mobile Relay in Full-Duplex Radio
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Solution Overview
Problem
In wireless communication systems, particularly in Full-Duplex Radio communication, interference management is challenging due to simultaneous transmission and reception using the same time-frequency resources, leading to self-interference, multi-user interference, and inter-BS interference, which affects communication performance.
Innovation Solution
The method involves a mobile relay acquiring and transmitting information on specific processing schemes, such as modulation and coding, precoding, and resource allocation, to manage interference. This information is used by base stations and other mobile stations to perform self-interference cancellation, utilizing techniques like antenna cancellation, analogue/digital interference cancellation, and zero-forcing/MMSE filtering to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full-duplex radio communication is implemented to enable simultaneous transmission and reception, then spectral efficiency and network capacity are improved, but self-interference and multi-user interference increase significantly
Solution Approach 1:
The patent segments the interference cancellation process into multiple stages: analog cancellation at the RF front-end and digital cancellation at the baseband processing stage. This segmentation allows each stage to handle specific types of interference with appropriate techniques, effectively reducing self-interference while maintaining full-duplex operation
Solution Approach 2:
The patent introduces an intermediary interference management entity that coordinates between base stations and relay nodes. This intermediary collects channel state information, determines interference patterns, and distributes cancellation parameters to relevant nodes, enabling cooperative interference mitigation across the network
2Adaptability or versatility
If mobile relay nodes are deployed to extend coverage and improve network flexibility, then service availability is enhanced, but interference management complexity increases
Solution Approach 1:
The patent implements preliminary action by having relay nodes report their processing schemes (modulation, coding, precoding) to base stations in advance. Base stations use this pre-acquired information to predict and prepare interference cancellation strategies before actual data transmission occurs, reducing real-time management complexity
Solution Approach 2:
The patent establishes feedback loops where relay nodes continuously report channel conditions and processing parameters to base stations. Base stations use this feedback to dynamically adjust precoding matrices and power allocation, enabling adaptive interference management that responds to changing network conditions
3Reliability
If interference cancellation techniques are applied to reduce self-interference, then signal reception quality is improved, but processing complexity and computational requirements increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting precoding matrices based on channel state information and interference conditions. Base stations modify transmission parameters such as precoding weights, power allocation, and resource scheduling to optimize signal quality while managing computational complexity through efficient matrix operations
Solution Approach 2:
The patent uses copying by creating virtual representations of interference signals based on reported processing schemes. Base stations reconstruct expected interference patterns from relay node transmission parameters and subtract these copied interference models from received signals, avoiding the need for complex real-time interference measurement and cancellation
Data Source
AI summary
In this disclosure, methods and apparatus for managing interference are disclosed. In one example, the first station receives the first signal from the base station. The first station acquires information on a specific processing scheme of a second station for processing the first signal to be transmitted to a third station at the second station. The first station receives a second signal from the base station while the second station transmits the first signal to the third station. Here, since the first station has knowledge on the first signal and the information on the specific processing scheme, it can manage interference caused by the first signal from the second station.