IAB Node Admission Control via Logical DU Context
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Solution Overview
Problem
Current wireless communication systems, particularly in Integrated Access and Backhaul (IAB) networks, face challenges in efficiently managing admission control for handovers between base stations, leading to resource allocation inefficiencies and potential service disruptions.
Innovation Solution
The implementation of a method where a base station sends a request message to an IAB-node to setup or modify a context for a child node, indicating that the child node is currently served by another logical IAB-DU, allowing the IAB-node to perform admission control and acknowledge the target BS without requiring additional resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If admission control is performed for every handover request in IAB networks, then service reliability is improved, but resource allocation efficiency deteriorates due to redundant resource reservations
Solution Approach 1:
The system performs preliminary admission control checks before handover by having the target IAB-DU verify resource availability and child node context in advance. The source IAB-DU sends handover request information including child node identifiers to the target IAB-DU, which performs admission control assessment before the handover is executed, preventing redundant resource reservations.
Solution Approach 2:
The source IAB-DU acts as an intermediary that coordinates between the target IAB-DU and the core network. It sends handover request information containing child node context to the target IAB-DU, which then performs admission control. This intermediary mechanism enables efficient resource management by sharing relevant information without requiring the core network to be involved in every handover decision.
2Productivity
If comprehensive context information is shared during handover, then handover efficiency is improved, but device complexity increases due to additional signaling overhead
Solution Approach 1:
The system extracts only the essential child node context information needed for admission control from the complete UE context. The source IAB-DU sends handover request information that includes specifically the child node identifiers and relevant context, rather than transmitting the entire UE context. This selective extraction reduces signaling overhead while providing sufficient information for the target IAB-DU to perform admission control.
3Ease of operation
If admission control is performed without identifying existing child nodes, then resource allocation is simplified, but service continuity deteriorates due to duplicate resource allocation
Solution Approach 1:
The target IAB-DU performs preliminary admission control by checking whether the child node is already served by this IAB-DU before allocating resources. The source IAB-DU sends handover request information including child node identifiers, enabling the target IAB-DU to identify existing child nodes in advance and avoid duplicate resource allocation, ensuring service continuity.
Data Source
AI summary
Aspects of the present disclosure provide techniques for admission control in a network (e.g., an Integrated Access and Backhaul (IAB) network). Certain aspects provide a method for wireless communication by a first base station (BS). The method generally includes sending, to an IAB-node, a request message requesting to setup or modify a context for a child node of a first logical IAB-distributed unit (DU) of the IAB-node, wherein the first logical IAB-DU is associated with the first BS, sending an indication to the IAB-node that the child node is currently served by the IAB-node at a second logical IAB-DU of the IAB-node, wherein the second logical IAB-DU is associated with a second BS, and receiving an acknowledgment message from the IAB-node based at least in part on the indication to the IAB-node.