IAB Beam Pair Signaling to Limit Simultaneous Multiplexing Interference
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Solution Overview
Problem
Simultaneous operation in integrated access and backhaul (IAB) networks poses challenges due to inter-link interference and self-interference, necessitating appropriate configuration of IAB-MT and IAB-DU beam pairs for efficient resource utilization and reduced latency.
Innovation Solution
A parent node determines a set of restricted IAB-DU beams based on interference measurements and transmits signaling to associate these beams with IAB-MT beams, while an IAB node performs operations using these restricted beams to mitigate interference, and communicates beam-specific parameters for scheduling decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous multiplexing operation is implemented in IAB networks, then spectral efficiency and resource utilization are improved, but inter-link interference and self-interference increase
Solution Approach 1:
The patent applies local quality by configuring different beam pairs for IAB-MT and IAB-DU functions with specific spatial characteristics. Each beam pair is optimized for its specific function (parent link or child link), creating local spatial quality differences that enable simultaneous operation while managing interference through directional beamforming rather than uniform treatment of all links.
Solution Approach 2:
The patent resolves the interference problem by transitioning from time-domain separation (TDM) to spatial-domain separation using beamforming. By adding the spatial dimension through carefully configured beam pairs with sufficient angular separation, the system enables simultaneous multiplexing in both time and space, effectively moving from one-dimensional time division to multi-dimensional resource allocation.
2Loss of time
If simultaneous multiplexing operation is implemented in IAB networks, then latency is reduced, but device complexity increases due to beam configuration requirements
Solution Approach 1:
The patent applies preliminary action by pre-configuring beam pairs with sufficient spatial separation before simultaneous multiplexing operations begin. The parent node determines and signals restricted beams and beam pair associations in advance, so that when simultaneous operation is activated, the interference management framework is already in place, reducing real-time complexity while enabling low-latency operation.
3Object-generated harmful factors
If beam pairs with sufficient spatial separation are configured, then inter-link interference is limited, but the number of available beams for each function is reduced
Solution Approach 1:
The patent applies segmentation by dividing the beam resource space into distinct segments for IAB-MT and IAB-DU functions. By segmenting the available beams and assigning specific segments to each function with restricted beam sets, the system ensures sufficient spatial separation to limit interference while maintaining adequate beam availability within each segmented resource pool.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a parent node in an integrated access and backhaul (IAB) network may transmit, to an IAB node having a mobile termination function (IAB-MT) and a distributed unit (IAB-DU), signaling indicating a set of restricted IAB-DU beams and associating the set of restricted IAB-DU beams with one or more IAB-MT beams, the set of restricted IAB-DU beams determined based on measurements related to interference caused by the IAB-DU and the IAB-MT performing a simultaneous operation in one or more simultaneous multiplexing modes. Additionally or alternatively, the parent node may perform scheduling for the IAB-MT based on signaling received from the IAB node that indicates beam-specific parameters related to a multiplexing capability for a beam pair that includes an IAB-MT beam and an IAB-DU beam associated with the IAB-MT beam. Numerous other aspects are provided.