IAB Node Access Link Switching for Interference Management
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Solution Overview
Problem
In integrated access and backhaul (IAB) systems, inter-user interference in multi-user MIMO transmissions within the same frequency band leads to decreased system performance due to the lack of coordinated resource scheduling that takes advantage of the multi-layer structural characteristics, resulting in additional signaling overhead and inefficient interference management.
Innovation Solution
The implementation of an electronic device with processing circuitry that measures signal interference and switches the access link between user equipment and nodes in the IAB system based on interference thresholds, establishing a direct access link to reduce interference, and using Amplify and Forward mode with digital precoding to mitigate inter-user interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If coordinated resource scheduling is performed between adjacent cells via X2 or Xn interface, then inter-cell interference is effectively avoided, but additional signaling overhead is introduced and the multi-layer structural characteristics of IAB system are not utilized
Solution Approach 1:
The IAB node autonomously performs interference measurement and determines link switching without requiring coordinated scheduling decisions from neighboring cells. The node measures interference on its own access links, compares against thresholds, and independently decides whether to switch to parent node access, eliminating the need for complex inter-cell signaling while reducing interference through self-optimized resource selection
Solution Approach 2:
The patent introduces a new dimension of interference management by utilizing the multi-layer IAB topology structure. Instead of traditional horizontal coordination between adjacent cells, the solution vertically exploits the parent-child node relationships, allowing nodes to switch between child node access and parent node access dimensions, thereby managing interference through topological diversity rather than temporal-frequency coordination
2Productivity
If child nodes use the same time-frequency resources to provide multi-user MIMO service, then system capacity is improved, but inter-small-cell interference occurs between adjacent child nodes
Solution Approach 1:
The access link configuration is made dynamic rather than static. Each IAB node continuously monitors interference levels on its access links and can dynamically switch between child node access and parent node access based on real-time interference conditions. This dynamic adaptation allows the system to maintain high capacity through multi-user MIMO while avoiding interference by switching access paths when interference exceeds thresholds
Solution Approach 2:
The patent changes the operational parameters of access links by introducing interference threshold-based switching. When interference measurements exceed predetermined thresholds, the system changes the access link parameter from child node access to parent node access, thereby altering the transmission path to avoid interfered frequency-time resources while maintaining system capacity through continued multi-user MIMO operations on non-interfered paths
Data Source
AI summary
An electronic device on side of user equipment, with an access link between the user equipment and a first node of an integrated access and backhaul (IAB) system, there being a backhaul link between the first node and a second node of the IAB system, wherein the second node is a parent node of the first node in network topology of the IAB system, characterized in that the electronic device includes: processing circuitry that measures a signal inference from a third node; reports an interference measurement to the first node; and in a case where the second node makes a determination to switch the access link used by the user equipment based at least in part on the interference measurement exceeding a predetermined threshold, establishes a direct access link between the user equipment and the second node and disconnect the access link between the user equipment and the first node.