IAB Relay Node Selection Using RSRP Imbalance Feedback
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Solution Overview
Problem
The challenge in the integrated access and backhaul (IAB) network is selecting an optimal relay node among multiple IAB nodes in a two-way relay (TWR) communication scheme, which affects communication performance due to signal distortion from power imbalances.
Innovation Solution
A method for selecting an optimal relay node involves transmitting reference signals, receiving feedback information on signal strength and power differences, and applying an XOR operation to improve communication efficiency by minimizing signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay node selection is performed in TWR communication scheme, then communication performance is improved, but complexity of selecting optimal relay among multiple nodes increases
Solution Approach 1:
The patent changes the selection parameter from complex multi-criteria evaluation to a single dominant parameter: average power difference of reference signals. By focusing on this one parameter, the system achieves reliable relay selection without the complexity of evaluating multiple factors simultaneously.
Solution Approach 2:
The patent implements feedback through reference signal transmission and power difference measurement. Each candidate relay node provides feedback about its received power from both communication nodes, allowing the selecting node to objectively compare and choose the optimal relay based on measured data rather than subjective evaluation.
2Reliability
If multiple candidate relay nodes are considered, then optimal relay selection is improved, but time required for selection increases
Solution Approach 1:
The patent performs preliminary action by having candidate relay nodes continuously measure and report their reference signal received power from both communication nodes before the actual selection is needed. This pre-collection of data eliminates the need for real-time complex evaluation during the selection moment, reducing selection time while maintaining optimality.
Solution Approach 2:
The patent simplifies the selection process by changing from multi-parameter evaluation to single-parameter decision-making based on average power difference. This parameter simplification dramatically reduces the computational time required for selection while still achieving optimal relay choice.
3Ease of operation
If power imbalance is not controlled, then relay operation is simplified, but signal distortion occurs
Solution Approach 1:
The patent uses feedback from reference signal power measurements to control power imbalance. By measuring the received power from both communication nodes at the relay and using this feedback information for selection and power control, the system prevents signal distortion while maintaining operational simplicity.
Solution Approach 2:
The patent changes the operational parameter from uncontrolled power transmission to controlled power transmission based on measured power differences. By adjusting transmit power according to the measured power imbalance, the system prevents signal distortion without complicating the overall operation.
Data Source
AI summary
Disclosed are a relay method and device in a communication system. An operation method of a first communication node comprises the steps of: transmitting a reference signal to one or more candidate R nodes; receiving first feedback information including a minimum value of a first RSRP from a first candidate R node belonging to the one or more candidate R nodes; receiving second feedback information including a minimum value of a second RSRP from a second candidate R node belonging to the one or more candidate R nodes; comparing a first value based on the first feedback information with a second value based on the second feedback information; when the first value is greater than the second value, selecting the first candidate R node as an R node that is to perform a relaying operation; and communicating with a second communication node via the R node.