IAB Node Scheduling Request Triggering for Uplink Delay Reduction
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Solution Overview
Problem
Current wireless communication systems face significant uplink (UL) delay in multi-hop Integrated Access and Backhaul (IAB) networks, particularly in 5G NR systems, due to the complexity of scheduling requests and data transmission across multiple nodes, which affects the overall efficiency and latency of data communication.
Innovation Solution
A method where a first node in the IAB system triggers a scheduling request (SR) based on expected transmissions from its child node, determining an SR configuration from multiple configurations to optimize UL resource allocation and reduce delay by anticipating data availability and allocating resources proactively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multi-hop IAB networks are used to extend coverage and improve network flexibility, then network adaptability and coverage are improved, but uplink delay increases due to complex scheduling requests across multiple nodes
Solution Approach 1:
The parent node triggers a scheduling request based on expected transmissions from the child node before the actual data transmission occurs. The parent node determines an SR configuration from multiple configured SR configurations and triggers the SR at an appropriate time, allowing resource allocation to be prepared in advance rather than waiting for the child node to request resources after data is ready for transmission.
2Productivity
If traditional scheduling request mechanisms are used in multi-hop IAB networks, then resource allocation follows standard procedures, but uplink delay increases due to sequential processing across multiple hops
Solution Approach 1:
The parent node performs preliminary actions by determining SR configuration and triggering scheduling requests in advance of actual data transmission needs. This allows the uplink resources to be allocated proactively, reducing the waiting time for resource allocation and thereby decreasing uplink delay while maintaining standard resource allocation procedures.
Data Source
AI summary
A method and apparatus are disclosed. In an example, a first node may trigger a scheduling request (SR) based upon an expected transmission from a second node which is a child node of the first node. The first node may determine a first SR configuration for the SR from a plurality of SR configurations configured to the first node.