IAB Packet Scheduling With Delay Bounds and Packet Discard
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Solution Overview
Problem
Existing wireless communication systems, particularly in integrated access and backhaul (IAB) networks, face challenges with multi-hop latency and topology-wide fairness, which affect quality of service (QoS) and congestion management.
Innovation Solution
Implementing packet delay budget (PDB) per backhaul radio link control (RLC) channels and delay-aware scheduling at IAB nodes, where packets with lower PDB values are prioritized, and packets exceeding a first delay parameter are discarded to manage latency and improve fairness and congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If delay-aware scheduling is implemented to prioritize packets with lower PDB values, then QoS and latency performance are improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by introducing separate first and second delay parameters to replace a single PDB value. The first delay parameter is used for packet discard determination while the second delay parameter is used for scheduling priority decisions. This differentiation allows the system to optimize both latency performance and scheduling complexity by using purpose-specific delay thresholds at different processing stages.
2Productivity
If packets exceeding delay threshold are discarded at IAB nodes, then congestion management and fairness are improved, but loss of information increases
Solution Approach 1:
The patent introduces an intermediary mechanism by using the first delay parameter as a preliminary filter before packets are fully processed and transmitted. Packets are evaluated against the first delay parameter at the IAB node to determine discard eligibility before committing resources for full transmission. This intermediary check prevents congested packets from consuming network resources while minimizing unnecessary discards of viable packets.
3Measurement precision
If separate first and second delay parameters are provided to IAB nodes, then scheduling accuracy and discard determination are improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the single delay parameter function into two distinct parameters: the first delay parameter for discard determination and the second delay parameter for scheduling decisions. This segmentation allows each parameter to be optimized for its specific purpose, improving measurement precision for both discard accuracy and scheduling priority while distributing the complexity across separate, well-defined functional areas.
Data Source
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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 a first delay parameter and a second delay parameter associated with a packet, the first delay parameter being associated with a discard determination for the packet and the second delay parameter being associated with scheduling the packet for transmission. The IAB node performs a discard decision for the packet based on the first delay parameter associated or schedules the packet for transmission to a second IAB node or a user equipment (UE) using a second delay parameter associated with the packet. A central unit (CU) of an IAB network may indicate, to an IAB node, the second delay parameter for scheduling a packet and the first delay parameter for determining whether to discard the packet.