IAB CQI Reporting With DU Interference for Backhaul Accuracy
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Solution Overview
Problem
The interference of the IAB-DU to the IAB-MT is not considered in the interference information measured by the IAB-MT, leading to inaccurate channel quality indicator (CQI) reporting and affecting the backhaul link transmission in integrated access backhaul systems.
Innovation Solution
The proposed method involves calculating and reporting CQI that considers the interference of the IAB-DU to the IAB-MT, including various interference scenarios, thereby enhancing the accuracy of the reported CQI, thereby enhancing the accuracy of the reported CQI, thereby improving the accuracy of the reported CQI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the IAB-MT measures interference information of its channel without considering IAB-DU interference, then the measurement process is simple, but the reported CQI is inaccurate and affects backhaul link transmission
Solution Approach 1:
The patent segments interference measurement into two distinct parts: (1) traditional interference measurement from other cells, and (2) self-interference measurement from IAB-DU downlink transmission. By separating these measurement objects and using different resource configurations (CSI interference measurement resources vs. dedicated interference measurement resources), the system achieves accurate CQI reporting while maintaining clear measurement boundaries and manageable complexity
Solution Approach 2:
The patent introduces an intermediary mechanism where the network configures dedicated interference measurement resources and indicates specific resource sets for measuring IAB-DU interference. This intermediary configuration layer mediates between the simple measurement capability of IAB-MT and the need for accurate interference assessment, enabling precise CQI reporting through properly structured measurement resources
2Reliability
If the IAB-MT reports CQI without considering IAB-DU interference, then the reporting process is simple, but the backhaul link transmission is affected due to inaccurate CQI
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure interference measurement resources and pre-indicate which resource sets should be used for measuring IAB-DU interference before actual data transmission. This preliminary configuration enables the IAB-MT to perform accurate interference measurement and CQI calculation in advance, ensuring reliable backhaul link transmission without adding complex real-time processing requirements
Solution Approach 2:
The patent implements feedback mechanisms where the IAB-MT measures interference on configured resources, calculates CQI reflecting both external and self-interference (from IAB-DU), and reports this comprehensive CQI back to the network. The network uses this feedback to adjust transmission parameters, creating a closed-loop system that improves backhaul link reliability through accurate interference-aware CQI reporting
Data Source
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AI summary
Embodiments of the present invention provide a channel quality indicator reporting method and an integrated access backhaul node. The channel quality indicator reporting method includes: obtaining a target CQI type that needs to be reported, where different interference information is used for calculating CQIs of different target CQI types, and interference of the IAB-DU to reception of the IAB-MT is considered in interference information used for calculating a CQI of the target CQI type; and calculating and reporting the CQI of the target CQI type.