Uplink Interference Cancellation in Dynamic TDD Systems
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Solution Overview
Problem
Dynamic TDD systems experience cross slot interference due to asynchronous uplink and downlink slot switch points between neighboring cells, leading to interference issues in wireless communication networks.
Innovation Solution
A method for a wireless transceiver device in a TDD system that involves receiving a wireless channel matrix from a neighboring device, obtaining downlink data from a cross slot, reestablishing interference signals using this matrix, and removing interference from uplink data signals without measuring the channel matrix when it is effective, while maintaining flexible resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic TDD system changes uplink and downlink switch points to adapt to traffic changes, then resource allocation flexibility is improved, but cross slot interference between neighboring cells increases
Solution Approach 1:
The patent converts the harmful cross-slot interference into a measurable and removable signal by estimating the interference channel matrix from received signals and using it to reconstruct and subtract the interference component from uplink received signals, thereby transforming the harmful interference into a useful information source for interference cancellation
Solution Approach 2:
The patent performs preliminary interference estimation and reconstruction before uplink signal detection by estimating the interference channel matrix and reconstructing the interference signal in advance, allowing the receiver to preemptively cancel the interference before it degrades the uplink signal quality
2Reliability
If interference cancellation techniques are applied to reduce cross slot interference, then signal quality is improved, but system complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the estimated interference channel matrix is used to reconstruct the interference signal, which is then subtracted from the received signal to produce a cleaned uplink signal, creating a feedback loop that continuously improves signal quality through iterative interference cancellation
Solution Approach 2:
The patent introduces an intermediary interference estimation process that acts as a mediator between the received composite signal and the final uplink signal extraction, using the estimated interference channel matrix as an intermediate representation to facilitate the separation of desired uplink signals from downlink interference
Data Source
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AI summary
The present invention provides an uplink data receiving method and apparatus of wireless transceiver device. The method includes: obtaining a wireless channel state parameter of neighboring wireless transceiver device of the device; obtaining downlink data sent by the neighboring wireless transceiver device in a cross slot with the device; reestablishing an interference signal according to the wireless channel state parameter and the downlink data; and removing the interference signal from an uplink data signal received by the device. By reestablishing the interference signal of the neighboring wireless transceiver device on an uplink data signal received by the device in the cross slot, and removing the interference signal from the uplink data signal received by the device, cross slot interference may be eliminated without influencing the flexible allocation of a dynamic TDD system on wireless resources.