Full-Duplex Wireless Power Control for Accurate Power Headroom
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Solution Overview
Problem
Existing power control methods in wireless communication systems, particularly in full-duplex or simultaneous transmission and reception scenarios, often result in incorrect power headroom reports and inefficient power distribution, leading to potential interference and performance degradation.
Innovation Solution
A power control method is proposed to adjust and balance the reception power levels of different signals in IAB nodes, ensuring that simultaneous reception and transmission operations do not cause interference by using CSI-RS resource sets, power level adjustments, and coordinated scheduling to maintain optimal signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception (full-duplex) are performed in IAB nodes, then spectral efficiency and network capacity are improved, but reception power imbalances and self-interference occur leading to incorrect power headroom reports
Solution Approach 1:
The patent applies preliminary action by configuring separate CSI-RS resource sets for different link directions (backhaul and access links) before simultaneous transmission and reception operations begin. This pre-configuration allows the wireless device to measure and report power headroom accurately for each link direction separately, preventing power imbalance issues before they occur during full-duplex operation.
Solution Approach 2:
The patent segments the CSI-RS resources into distinct resource sets corresponding to different link directions (e.g., one resource set for backhaul link, another for access link). This segmentation allows independent power control and measurement for each link direction, enabling accurate power headroom reporting even during simultaneous transmission and reception operations.
2Device complexity
If power control is performed without separate CSI-RS resource sets for different link directions, then system complexity is reduced, but power distribution becomes improper and interference increases
Solution Approach 1:
The patent segments CSI-RS resources into separate resource sets for different link directions, allowing independent power control measurements. This segmentation enables the system to track power headroom for backhaul and access links separately, preventing interference through proper power distribution without requiring complex additional hardware or protocols.
Solution Approach 2:
The patent makes the existing CSI-RS resource configuration mechanism multi-functional by assigning different CSI-RS resource sets to different link directions and purposes. This universal approach allows a single power control framework to handle multiple link directions independently, avoiding the need for separate complex control mechanisms while still preventing interference.
3Measurement precision
If separate CSI-RS resource sets are configured for different link directions, then power headroom reporting accuracy is improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent configures separate CSI-RS resource sets for different link directions in advance through higher-layer signaling (RRC configuration), so that when simultaneous transmission and reception occurs, the device can immediately use the pre-configured resources for accurate measurements without real-time configuration overhead.
Solution Approach 2:
The patent uses template-based configuration where multiple CSI-RS resource sets can be defined with similar structures but different parameters (e.g., different associations with link directions). This copying approach allows consistent measurement procedures to be reused across different link directions, reducing the overall configuration complexity while maintaining measurement precision.
Data Source
AI summary
The present disclosure proposes a power control method that can be used when performing simultaneous transmission and reception, such as full duplex. A power control method performed by a first wireless device, according to an embodiment of the present disclosure, comprises: measuring self-interference for uplink reception of the first wireless device; and transmitting power control request information to a second wireless device on the basis of the self-interference exceeding the allowable range, wherein the power control request information includes power control information for uplink transmission of the first wireless device.