IAB Node Frequency Division Multiplexing for Cross-Link Interference
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Solution Overview
Problem
Integrated Access and Backhaul (IAB) nodes in wireless networks face challenges in managing cross-link interference (CLI) and self-interference (SI) due to dynamic traffic variations over backhaul networks, which can lead to suboptimal performance and resource underutilization.
Innovation Solution
The solution involves configuring and coordinating frequency division multiplexing (FDM) on access and backhaul links, allowing IAB nodes to dynamically adapt time and frequency domain resources. This includes using over-the-air signaling for resource block (RB) usage coordination between IAB nodes and their parent nodes, enabling flexible sharing of hard, soft, and not-available resources based on traffic and interference considerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IAB nodes provide both UE access communications and backhaul communications simultaneously, then network functionality and service coverage are improved, but cross-link interference and self-interference increase
Solution Approach 1:
The patent segments radio resources by dividing the frequency spectrum into separate resource blocks for access links and backhaul links. This frequency division multiplexing separates the harmful interference paths while allowing both access and backhaul functions to operate simultaneously on the same IAB node.
Solution Approach 2:
The patent applies different frequency resource allocations to different functional links at the IAB node. Access links use specific frequency resources while backhaul links use other frequency resources, giving each link localized quality characteristics that prevent interference between them.
2Productivity
If IAB nodes dynamically adapt time and frequency domain resources, then resource utilization efficiency is improved, but system complexity and coordination overhead increase
Solution Approach 1:
The patent enables dynamic adaptation of frequency resources for access and backhaul links based on traffic conditions and interference levels. IAB nodes can adjust their frequency domain resource allocation in real-time, transforming the static resource allocation into a dynamic system that responds to changing network conditions.
Solution Approach 2:
The patent implements feedback mechanisms where IAB nodes monitor interference conditions and traffic demands, then adjust frequency resource allocation accordingly. This feedback loop allows the system to maintain optimal resource utilization while managing complexity through adaptive rather than purely static allocation.
3Reliability
If frequency division multiplexing is implemented on access and backhaul links, then interference is reduced and network performance is optimized, but resource coordination signaling overhead increases
Solution Approach 1:
The patent establishes frequency resource allocation patterns and multiplexing configurations in advance through network configuration messages. By pre-configuring the frequency division multiplexing scheme, the system reduces the need for continuous dynamic signaling while maintaining optimized interference management.
Data Source
AI summary
Aspects of the subject disclosure may include, for example, configuring, coordinating, and operating frequency division multiplexing on one or more access and backhaul links. The subject disclosure further describes how an IAB node and a serving parent node can coordinate resource block (RB) usage and RB set usage using over-the-air signaling. Other embodiments are described in the subject disclosure.