IAB Network Latency Measurement for Packet Delay Budget Routing
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Solution Overview
Problem
The implementation of split architecture and IAB technologies in 5G networks introduces additional latency components that need to be managed, particularly in multi-hop relay systems, to ensure that data packets are delivered within the specified Packet Delay Budget (PDB) requirements.
Innovation Solution
Implementing latency-aware routing mechanisms and discard mechanisms in IAB networks, where the donor CU collects one-hop latency information, configures routing paths, and employs packet discard mechanisms to ensure that data packets are either forwarded or discarded based on PDB compliance, using BAP discard timers and latency measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latency measurements are performed and routing adjustments are made to meet PDB requirements, then QoS reliability is improved, but network device complexity increases
Solution Approach 1:
The patent performs latency measurements and configures discard timers in advance before data packets are transmitted. By pre-configuring the discard timer based on measured latency values and PDB requirements, the system prepares routing decisions beforehand, ensuring QoS reliability without adding complex real-time decision-making mechanisms during packet transmission.
Solution Approach 2:
The network nodes autonomously perform latency measurements, calculate appropriate discard timer values, and configure themselves without requiring complex centralized control. Each node independently manages its own timing parameters based on local measurements and received PDB information, reducing overall network device complexity while maintaining reliability.
2Reliability
If discard timers are configured based on latency measurements, then packet loss is reduced, but measurement and control overhead increases
Solution Approach 1:
The patent performs latency measurements selectively rather than continuously for all packets. By measuring latency periodically or for specific packet types and configuring discard timers based on these partial measurements, the system achieves sufficient packet delivery reliability without the excessive overhead of continuous comprehensive monitoring.
3Measurement precision
If multiple latency measurements are performed across IAB nodes, then routing accuracy is improved, but processing time increases
Solution Approach 1:
Latency measurements are performed in advance during network setup and configuration phases, before actual data transmission begins. This preliminary measurement approach allows for precise routing calculations without adding processing delays during time-critical packet forwarding operations.
Data Source
AI summary
Methods, systems, and devices for latency management in integrated access and backhaul (IAB) networks for mobile communications are described. An example method for wireless communication includes receiving, by a first network node from a second network node, a measurement configuration, performing, based on the measurement configuration, one or more latency measurements, and transmitting, to the second network node, a measurement report comprising the one or more latency measurements or an identification of the channel used for the one or more latency measurements.