Uplink Receive Filter for Full Duplex Interference Mitigation
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Solution Overview
Problem
Full duplex communication in wireless networks faces challenges due to increased interference between radio access nodes operating in the same frequency interval, which hampers spectral efficiency and system capacity.
Innovation Solution
A method for suppressing interference at a radio access node by acquiring channel condition measurements, selecting a set of radio access nodes based on interference levels, and determining an uplink receive filter to mitigate interference, which includes using a null space defined by channel conditions to optimize the filter for effective interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If full duplex communication is implemented in wireless networks, then spectral efficiency and throughput are improved, but interference between radio access nodes increases
Solution Approach 1:
The patent applies preliminary anti-action by proactively identifying interfering radio access nodes through channel condition measurements and pre-configuring uplink receive filters to suppress interference before it degrades system performance. The network node measures channel conditions to other radio access nodes, selects interfering nodes based on these measurements, and determines appropriate receive filters to counteract the interference in advance.
2Productivity
If multiple radio access nodes operate in full duplex mode, then system capacity increases, but the number of interference sources increases
Solution Approach 1:
The patent applies local quality by implementing interference suppression specifically at the receiver side of each radio access node through customized uplink receive filters. Each node independently measures channel conditions to identify its specific interferers and configures local receive filters tailored to suppress those particular interference sources, rather than attempting system-wide interference management.
3Reliability
If uplink receive filter is determined based on null space of channel conditions, then interference suppression is optimized, but computational complexity increases
Solution Approach 1:
The patent applies partial action by determining the uplink receive filter based on the null space of channel conditions only for the selected set of interfering radio access nodes, rather than computing null spaces for all possible nodes in the network. This selective approach achieves sufficient interference suppression for the dominant interferers while reducing the computational burden compared to a comprehensive solution.
Data Source
AI summary
Disclosed is a method for suppression, at a first radio access node, of interference caused by one or more other radio access nodes when the first radio access node and/or the other radio access nodes operate in a full duplex mode. The full duplex mode comprises simultaneous transmission and reception in a same frequency interval.The method comprises acquiring measurements indicative of channel conditions between the one or more other radio access nodes and the first radio access node, wherein channel conditions indicate interference caused at the first radio access node by the one or more other radio access nodes.The method also comprises selecting a set of radio access nodes from the one or more other radio access nodes based on the channel conditions between the one or more other radio access nodes and the first radio access node, and determining an uplink receive filter for suppression of interference at the first radio access node based on the channel conditions between the selected set of radio access nodes and the first radio access node.In some embodiments, the method further comprises controlling one or more user devices served by the first radio access node to apply an uplink transmit beamforming which is based on the uplink receive filter.Corresponding user device method, apparatuses, network node, user device, and computer program product are also disclosed.