IAB Node Resource Configuration to Reduce Cross-Link Interference
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Solution Overview
Problem
Existing Integrated Access and Backhaul (IAB) networks face challenges in managing cross-link interference (CLI) due to insufficient knowledge of radio resource configurations, leading to inefficiencies and interference between access and backhaul links.
Innovation Solution
The downstream IAB node receives a first radio resource configuration from an upstream IAB node, determines a second radio resource configuration based on this information, and communicates with served nodes using these resources to minimize CLI by avoiding overlapping resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the downstream IAB node uses the same radio resources as the upstream IAB node, then resource utilization is improved, but cross-link interference increases
Solution Approach 1:
The radio resources are segmented into different types (flexible resources, hard uplink resources, hard downlink resources) and allocated to different nodes. The downstream IAB node is configured to use only flexible resources while the upstream node uses hard uplink resources, preventing resource overlap and cross-link interference while maintaining efficient resource utilization.
Solution Approach 2:
Different radio resource configurations are applied locally to different IAB nodes based on their specific roles and requirements. The downstream node receives a customized configuration indicating flexible resources, while the upstream node has access to hard uplink resources, ensuring each node operates with optimal resources for its function without causing interference to others.
2Reliability
If the downstream IAB node has full knowledge of upstream node's radio resource configuration, then CLI management is improved, but information overhead increases
Solution Approach 1:
Instead of transmitting the complete radio resource configuration of the upstream node, only the essential information needed for CLI management is extracted and transmitted to the downstream node. Specifically, only the flexible resource configuration is communicated, which is sufficient for the downstream node to avoid overlapping resource usage while minimizing information overhead.
Solution Approach 2:
The downstream IAB node is provided with partial knowledge of the upstream node's configuration - specifically only the flexible resources - rather than complete configuration information. This partial information is sufficient for effective CLI management since the downstream node can avoid using these flexible resources, preventing interference without requiring full configuration details.
Data Source
AI summary
There is provided a method to operate a downstream IAB, Integrated Access and Backhaul, node of an IAB network, is provided, wherein the method comprises: receiving a first radio resource configuration that indicates a use of radio resources by the upstream IAB node and by at least one radio node served by the upstream IAB node; determining a second radio resource configuration or the downstream IAB node in dependence on the first radio resource configuration; and communication with at least one radio node, which is served by the downstream IAB node, via radio resources according to the second radio resource configuration.