Wireless L4S ECN Handling for Radio Queuing Delay
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems, particularly in the context of low latency low loss scalable throughput (L4S) protocols, face challenges in addressing additional delays and packet loss/recovery characteristics introduced by radio access networks, which impact overall latency and user experience in latency-sensitive applications like extended reality (XR) and time sensitive networking (TSN).
Innovation Solution
Enhancing and extending L4S traffic handling to account for radio environment-specific protocol and configuration aspects, with wireless devices configured to process packets including explicit congestion notification (ECN) information related to radio network delays, and network devices adding ECN information to uplink packets for core network output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If L4S protocol is implemented in wireless communication systems, then packet loss and latency are reduced, but additional delays and buffer handling issues are introduced by radio access networks
Solution Approach 1:
The patent applies preliminary action by pre-configuring ECN (Explicit Congestion Notification) fields in packets before transmission through the radio access network. Network devices mark packets with ECN information in advance to indicate congestion conditions, allowing end devices to adjust transmission parameters proactively before actual packet loss occurs, thus resolving the contradiction between reducing packet loss and minimizing queuing delay
Solution Approach 2:
The patent implements feedback mechanisms where network devices monitor radio network conditions and inject ECN markings into packets based on observed congestion levels. This feedback loop allows the L4S protocol to dynamically adjust transmission behavior in response to real-time network conditions, simultaneously improving reliability and reducing latency by preventing buffer overflows before they occur
2Reliability
If ECN information is added to packets for L4S service, then congestion management is improved, but device complexity increases
Solution Approach 1:
The patent extracts the congestion management functionality into a separate, standardized ECN field within the packet structure. By isolating congestion indication into a dedicated field rather than requiring complex protocol analysis, the system improves congestion management while minimizing the processing complexity burden on network devices and end systems
Solution Approach 2:
The ECN field serves multiple functions simultaneously: it indicates congestion status, triggers L4S protocol responses, and provides feedback for network optimization. This multi-functionality allows a single field to improve congestion management across different network conditions without requiring separate processing mechanisms for each function, thereby reducing overall device complexity
Data Source
AI summary
The apparatus may be a wireless device or user equipment (UE) configured to obtain a first plurality of generated packets including information related to the L4S service and process, based on the information related to the L4S service, the first plurality of generated packets for transmission by the UE. The apparatus may be a network device configured to some examples, a network device may be configured to include, in each received UL packet of a first plurality of received uplink (UL) packets, explicit congestion notification (ECN) information related to radio network delays and output, for a core network, the first plurality of received UL packets including the ECN information related to the L4S service.