IAB Pre-Emptive BSR Cascading for Low-Latency Uplink Scheduling
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Solution Overview
Problem
Current protocols do not allow integrated access backhaul (IAB) nodes to trigger pre-emptive BSR based on a pre-emptive BSR received, leading to high latency in uplink wireless transmission when serving low-latency services over long backhaul links, resulting in resource waste and inefficiency.
Innovation Solution
Implementing a method for configuring iterative pre-emptive BSRs by IAB nodes and centralized units, using configuration parameters to control when and how pre-emptive BSRs are triggered based on received BSRs, including new MAC CE formats to manage logical channels, data radio bearers, service types, and congestion, thereby optimizing uplink scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If IAB nodes are not allowed to trigger pre-emptive BSR based on received pre-emptive BSR, then protocol complexity is reduced, but uplink transmission latency increases significantly
Solution Approach 1:
The patent enables IAB nodes to trigger pre-emptive BSR based on received pre-emptive BSR, allowing upstream nodes to proactively allocate resources before data arrives. This preliminary action propagates through the backhaul chain, ensuring downstream nodes are ready to transmit immediately when data reaches them, thereby reducing uplink latency without significantly increasing protocol complexity.
2Productivity
If pre-emptive BSR is used in multi-hop uplink transmission, then resource allocation is improved, but transmission latency increases due to multiple hops
Solution Approach 1:
The patent extends pre-emptive BSR triggering across multiple hops in the backhaul chain. When a downstream IAB node receives a pre-emptive BSR, it triggers a pre-emptive BSR to its upstream parent node, which in turn triggers another pre-emptive BSR further upstream. This cascading preliminary action ensures that resource allocation decisions are made at each hop in advance, compensating for the time required for data to traverse multiple hops and reducing overall transmission latency.
3Productivity
If iterative pre-emptive BSR is enabled, then uplink grant utilization is optimized, but device complexity increases
Solution Approach 1:
The patent enables iterative pre-emptive BSR triggering, where an IAB node can trigger another pre-emptive BSR based on a previously triggered pre-emptive BSR. This iterative mechanism allows nodes to proactively request additional resources if initial allocations are insufficient, optimizing uplink grant utilization. The complexity increase is managed through standardized processing procedures at each node.
Data Source
AI summary
A method and an apparatus for configuring a pre-emptive BSR, and an electronic device are provided. The method for configuring a pre-emptive BSR includes: receiving, by an integrated access backhaul IAB node, a pre-emptive BSR configuration parameter, where the configuration parameter is used to indicate whether the IAB node triggers an iterative pre-emptive BSR, and the iterative pre-emptive BSR is a pre-emptive BSR that is generated based on a received pre-emptive BSR by the IAB node and that is to be transmitted to a parent IAB node.