Inter-Cell Interference Classification Signal for MIMO Coordination
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Solution Overview
Problem
In massive MIMO systems, existing methods fail to effectively manage inter-cell interference due to increased antenna gain, leading to strong interference and reduced interference cancellation efficiency, particularly at cell edges, where terminals struggle with complex reception and high failure probabilities.
Innovation Solution
A method is proposed where base stations classify signals based on antenna gain levels and notify adjacent cells of interference cancellation probabilities and beam coverage, using an inter-cell interference classification signal (IICS) to coordinate scheduling and resource allocation, allowing for effective interference suppression and cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming and precoding are used to increase signal to noise ratio, then transmission quality is improved, but inter-cell interference increases due to increased antenna gain
Solution Approach 1:
The patent implements a feedback mechanism where the receiving base station measures interference from neighboring cells and feeds back interference information to the transmitting base station. This enables the transmitting base station to adjust beamforming weights and precoding matrices to reduce interference in specific directions, resolving the contradiction between maintaining high signal quality and reducing inter-cell interference through closed-loop optimization
Solution Approach 2:
The patent applies local quality by directing beamforming energy selectively toward intended receivers while creating nulls or low-gain regions toward neighboring cells. The beamforming weights are optimized to provide high gain in the desired direction while suppressing interference in specific spatial locations, achieving local quality enhancement without uniform interference increase
2Reliability
If interference cancellation is performed at cell edge terminals, then reception quality is improved, but terminal complexity and failure probability increase
Solution Approach 1:
The patent introduces the base station as an intermediary that performs interference cancellation processing centrally rather than at the terminal. The base station receives data from the terminal, cancels interference using network-side resources and algorithms, then transmits the processed signal, thereby reducing terminal complexity while maintaining reception quality through network-assisted interference management
Solution Approach 2:
The patent shifts interference cancellation from the terminal dimension to the network dimension by implementing interference management at the base station level. This dimensional shift allows utilization of network-side computational resources and coordinated multi-cell processing, reducing the burden on terminal devices while achieving effective interference cancellation through higher-level system coordination
3Productivity
If resource allocation is optimized for interference cancellation, then system capacity is improved, but scheduling complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring resource allocation patterns and beamforming parameters that are optimized for interference cancellation before actual data transmission. Resource blocks, reference signals, and beamforming weights are pre-coordinated between neighboring base stations, enabling efficient interference management without complex real-time scheduling decisions, thus improving system capacity while keeping scheduling complexity manageable
Data Source
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AI summary
Provided is a method and apparatus for transmitting interference signal information for inter-cell interference cancellation in a wireless communication system. The method for transmitting interference signal information may comprise the steps of: calculating the intensity of a signal on the basis of antenna gain and transmission power for a generated signal; generating probability information on the probability that interference is cancelled when the signal acts as interference; determining interference signal information indicating a feature of the signal when the signal acts as interference, on the basis of the antenna gain, the intensity of the signal, and the probability information; and transmitting the interference signal information to an adjacent cell.