IAB RLC Packet Delay Budget Scheduling for TSC Traffic
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Solution Overview
Problem
Existing wireless communication systems, particularly in integrated access and backhaul (IAB) networks, face challenges in accurately determining packet delay budgets (PDB) for radio link control (RLC) channels and efficiently reporting stack processing times, which are crucial for optimizing communication latency and reliability.
Innovation Solution
Implementing methods for determining and enhancing packet delay budgets across full or partial protocol stacks in IAB networks, including signaling mechanisms for IAB nodes to report their stack processing capabilities to donor or parent nodes, enabling better scheduling decisions and latency management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PDB determination methods are used in IAB networks, then the implementation is simple, but the packet delay budget accuracy is insufficient for time-sensitive communications
Solution Approach 1:
The patent segments the protocol stack processing time into distinct components: RLC layer processing time, MAC layer processing time, and PHY layer processing time. Each segment is measured and reported separately, allowing the donor node to calculate accurate end-to-end PDB by summing these segments. This segmentation enables precise PDB determination while maintaining manageable complexity through modular measurement approaches.
Solution Approach 2:
The patent implements feedback mechanisms where IAB nodes measure their stack processing times and report these measurements back to the donor node. The donor node uses this feedback information to calculate and configure accurate PDB values for TSC traffic. This feedback loop enables continuous optimization of PDB determination based on actual measured performance rather than theoretical estimates.
2Productivity
If stack processing time reporting is implemented, then scheduling efficiency improves, but signaling overhead increases
Solution Approach 1:
The patent leverages existing uplink signaling resources and message structures to carry stack processing time information. Rather than creating dedicated signaling channels, the solution embeds processing time measurements within existing uplink reports that IAB nodes already transmit to donor nodes. This multi-use approach to existing signaling infrastructure minimizes additional overhead while enabling efficient scheduling decisions based on accurate processing time data.
Data Source
AI summary
Aspects of the present disclosure may provide an apparatus, which may include a first node that may receive an indication of a one-hop radio link control (RLC) channel packet delay budget (PDB) for an RLC channel between the first node and a second node. The PDB is across a full protocol stack or a partial protocol stack. The first node may then schedule communications with the second node based on the one-hop RLC channel PDB. In some cases, an IAB node may report a capability of its stack processing time to an IAB donor node and/or a parent IAB node (directly or indirectly).