L4S Traffic Separation and Rate Adaptation for Packet Drop Prevention
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Solution Overview
Problem
Current technologies fail to adequately prevent packet loss for low latency, scalable throughput (L4S) data flows due to the same queue management policies being applied to both L4S and non-L4S traffic, leading to unnecessary packet dropping when congestion is detected.
Innovation Solution
Implementing techniques that allow user equipment (UE) to determine base station capabilities for L4S support and adapt rate accordingly, and enabling base stations to establish separate PDU sessions for L4S and non-L4S traffic based on congestion thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same queue management policy is applied to both L4S and non-L4S traffic, then the network management is simplified, but packet loss increases for L4S traffic during congestion
Solution Approach 1:
The patent segments traffic management by creating separate queue management policies for L4S and non-L4S traffic. L4S traffic receives preferential treatment with dedicated queues and different dropping thresholds, while non-L4S traffic uses traditional policies. This segmentation resolves the contradiction by maintaining simple overall management while providing specialized protection for L4S packets during congestion events.
2Reliability
If rate adaptation is applied to L4S traffic, then packet loss is reduced, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where network devices monitor congestion conditions and send signaling information back to the L4S transmitter. The transmitter adjusts its rate based on this feedback, applying rate adaptation only when congestion is detected. This approach reduces packet loss while limiting complexity to only the necessary feedback paths and conditional logic, rather than requiring complex continuous control mechanisms.
3Reliability
If separate PDU sessions are established for L4S and non-L4S traffic, then packet loss is reduced, but network configuration complexity increases
Solution Approach 1:
The patent enables dynamic PDU session management where the network can establish, modify, or tear down PDU sessions based on real-time congestion conditions and L4S capability detection. Rather than statically configuring separate sessions for all traffic, the system adaptively creates separate L4S sessions only when needed and when both endpoints support L4S, reducing unnecessary configuration complexity while maintaining reliability when required.
Data Source
AI summary
Described herein are solutions for reducing packet loss for low latency, low loss, scalable throughput (LAS) traffic. A user equipment (UE) can determine whether a base station is capable of supporting LAS traffic and can implement rate adaptation in different ways based on the LAS capabilities of the base station and active queue management (AQM) policies of the base station. A base station can establish protocol data unit (PUD) sessions between the UE and different instances of a network slice based on whether the base station receives packets from applications capable of LS4 rate adaptation. These and many other features and examples are described in additional detail.