Interference Power Determination in D-TDD Wireless Networks
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Solution Overview
Problem
In wireless network systems using dynamic time division duplex (D-TDD) technology, co-channel cross interference severely affects performance and limits resource utilization, necessitating effective interference identification and suppression methods.
Innovation Solution
A signal transmission method that involves a transmit node generating a first signal with non-zero power on a first resource and no signal on a second resource, while a receive node measures interference powers on both resources to accurately determine the interference power of the transmit node, thereby eliminating the impact of interference from other nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If co-channel frequency reuse is used to improve resource utilization, then network capacity increases, but co-channel cross interference between neighboring cells worsens
Solution Approach 1:
The patent segments the interference measurement process into two distinct parts: a first resource for measuring total interference (including target node and other nodes) and a second resource for measuring interference from other nodes only. This segmentation allows the system to isolate and eliminate the interference component from other nodes, thereby accurately measuring the interference from the target node while maintaining co-channel frequency reuse for improved network capacity.
Solution Approach 2:
The patent introduces a second resource as an intermediary measurement channel that does not carry signals from the target node. This intermediary resource allows the receive node to measure interference from other nodes separately, which then serves as a reference to subtract from the total interference measurement, effectively isolating the target node's interference contribution.
2Device complexity
If interference measurement is performed on a single resource, then measurement process is simplified, but accuracy of interference power determination worsens due to inability to eliminate other nodes' interference
Solution Approach 1:
The measurement process is segmented into two distinct measurement resources with different signal configurations. The first resource measures total interference while the second resource measures interference from other nodes only. This segmentation enables accurate determination of target node interference by subtracting the second measurement from the first, resolving the trade-off between process simplicity and measurement accuracy.
Solution Approach 2:
The patent performs an additional measurement on a second resource beyond what would be minimally required for basic interference measurement. This excessive action (second measurement) provides the necessary reference data to eliminate other nodes' interference, thereby achieving high measurement precision despite the increased process complexity.
Data Source
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AI summary
Embodiments of the present invention disclose a signal transmission method and a related device. The method includes: generating, by a transmit node, a first signal; and sending, by the transmit node, the first signal on a first resource, where a transmit power of the first signal is non-zero, the first signal is superimposed on a third signal sent on the first resource, and the third signal is used by a receive node to obtain a first interference power, where the transmit node sends no signal on a second resource, there is a fourth signal on the second resource, the fourth signal is used by the receive node to obtain a second interference power, and the first interference power and the second interference power are used to obtain an interference power of the transmit node on the receive node. According to the embodiments of the present invention, it helps accurately determine the interference power of the transmit node on the receive node without affecting resource occupation of the first resource and the second resource by another node device.