Uplink Access Node Cooperation for Interference Cancellation
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Solution Overview
Problem
Current wireless communication networks face challenges with co-channel interference, particularly in dense deployments, where simultaneous transmissions using the same physical resources lead to reduced signal quality and system capacity, and existing solutions do not effectively address the need for efficient signal cooperation between access nodes without relying on a central controlling node.
Innovation Solution
A method for optimizing signals received from terminals by enabling on-demand cooperation between access nodes through a request-response or subscribe-publish mechanism, allowing for the exchange of necessary parameters for interference cancellation and distributed control, without requiring a central node, by selecting the most promising access nodes to participate in cooperative transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Rx signals are collected from multiple BSs for joint processing to cancel co-channel interference, then signal quality is improved, but network complexity and signaling overhead increase
Solution Approach 1:
The patent segments the signal processing function by having each BS independently process its received signal to extract interference information, rather than collecting all raw signals at a central node. This distributed segmentation reduces network complexity while maintaining interference cancellation capability through localized processing.
Solution Approach 2:
The patent extracts only the necessary interference information from received signals at each BS, rather than transmitting complete signal data. This extraction approach reduces signaling overhead and network complexity while preserving the essential information needed for interference cancellation at the serving BS.
2Object-generated harmful factors
If all BSs exchange Rx signals for cooperative reception, then interference cancellation is improved, but signaling overhead and network load increase
Solution Approach 1:
The patent applies local quality by having each BS perform localized signal processing to extract interference information specific to its reception conditions. This localized processing reduces the amount of information that needs to be exchanged across the network, thereby reducing signaling overhead while maintaining effective interference cancellation.
Solution Approach 2:
The patent performs preliminary signal processing and interference information extraction at each BS before exchange. This preliminary action reduces the volume of data that needs to be transmitted across the network, decreasing signaling overhead while preserving the capability for effective interference cancellation.
3Object-generated harmful factors
If a central node collects Rx signals for joint processing, then interference cancellation is improved, but reliability decreases when the central node is unavailable or heavily loaded
Solution Approach 1:
The patent enables each BS to independently perform interference information extraction and processing without relying on a central node. This self-service capability distributes the processing load, eliminates single points of failure, and improves system reliability while maintaining interference cancellation functionality through decentralized operation.
4Measurement precision
If transmit parameters are exchanged between cooperating BSs for interference cancellation, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent exchanges only the essential transmit parameters needed for interference cancellation rather than complete signal data or all possible parameters. This partial action approach reduces coordination complexity while maintaining sufficient information for effective interference cancellation and signal quality improvement.
Data Source
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AI summary
For uplink cooperation of a serving access node (100-1) and a supporting access node (100-2) with respect to a terminal (200), the serving access node (100-1) requests information relating to an Rx signal (10-2) received from the terminal (200) at the supporting access node (100-2). The requested information may include a baseband representation of the Rx signal (10-2), demodulated bits of the Rx signal (10-2), or decoded bits of the Rx signal (10-2). The supporting access node (100-2) obtains the requested information from the Rx signal (10-2) and sends a response including the information to the serving access node (100-1). The serving base station determines an optimized signal on the basis of the information received from the supporting access node (100-2) and on the basis of corresponding information relating to a signal (10-1) received from the terminal (200) at the serving access node (100-1).