IAB Node Access Packet Delay Budget Determination
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Solution Overview
Problem
Current wireless communication systems, particularly in integrated access and backhaul (IAB) networks, face challenges in accurately determining and managing packet delay budgets (PDBs) over air links, which affects the quality of service and efficiency of data transmission.
Innovation Solution
The implementation of a method where an IAB node receives delay parameters from a central unit (CU) to determine an access packet delay budget (PDB) over an air link between the IAB node and a child node or user equipment (UE), enabling efficient data packet transmission by indicating and managing delay constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an IAB node uses traditional delay parameter management methods, then the system operation is simple, but the packet delay budget determination accuracy is insufficient
Solution Approach 1:
The total packet delay budget is segmented into multiple components: backhaul packet delay budget, access packet delay budget, and buffering timing advance. This segmentation allows each component to be independently determined and optimized, improving overall accuracy while maintaining manageable complexity through modular parameter handling.
Solution Approach 2:
The network configuration message pre-configures the IAB node with delay parameters including backhaul PDB and buffering timing advance before actual data transmission. This preliminary configuration enables the IAB node to proactively determine access PDB without real-time complex calculations, improving determination accuracy while simplifying runtime operations.
2Reliability
If an IAB node accurately determines access PDB using multiple delay parameters, then the quality of service is improved, but the signaling overhead increases
Solution Approach 1:
Multiple delay parameters (backhaul PDB, access PDB, buffering timing advance) are combined and transmitted together in a single network configuration message from the donor base station to the IAB node. This merging approach ensures all necessary parameters are delivered efficiently in one signaling event, improving QoS through accurate PDB determination while minimizing total signaling overhead.
3Adaptability or versatility
If an IAB node manages delay parameters for multiple child nodes and UEs, then the resource management capability is improved, but the computational complexity increases
Solution Approach 1:
The IAB node autonomously determines its own access packet delay budget by using the received backhaul PDB parameter and buffering timing advance in a local calculation. This self-service approach enables the node to independently manage resources for multiple child nodes and UEs without requiring complex centralized computations, improving resource management capability while keeping computational complexity manageable at each node.
Data Source
AI summary
A method, a computer-readable medium, and an apparatus are provided for wireless communication at an integrated access and backhaul (IAB) node. The IAB node receives one or more delay parameters from an IAB donor and determines an access PDB over an air link between the IAB node and a child node or a UE based in part on the one or more delay parameters received from the IAB donor.