RTP Packet Marking for Ultralow-Latency Media Delivery
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Solution Overview
Problem
Existing congestion control mechanisms in real-time transport protocol (RTP) introduce latency, jitter, and packet loss, and struggle to coexist with classic traffic in shared networks, leading to network congestion and buffer bloat, particularly in low- to ultralow-latency content delivery scenarios like interactive gaming and video streaming.
Innovation Solution
Implement methods and systems that prioritize processing of transport units based on predefined standards, adjust network settings, and manage bandwidth to ensure low- to ultralow-latency content delivery by marking units for preferential or non-preferential processing, and adjust encoder bitrates based on target conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If L4S service is implemented with scalable congestion control, then queuing delay is reduced and latency is minimized, but network congestion may increase and classic traffic coexistence becomes challenging
Solution Approach 1:
The patent applies local quality by differentiating between L4S traffic and classic traffic with distinct queue management and congestion control mechanisms. The system maintains separate handling for real-time L4S traffic (with scalable congestion control and low latency) versus classic traffic (with traditional congestion control), allowing each type to receive optimized service according to its specific requirements without interfering with the other.
Solution Approach 2:
The patent segments the network traffic into L4S traffic and classic traffic, managing them through separate queues and congestion control mechanisms. This segmentation allows the system to apply scalable congestion control to L4S traffic for low latency while maintaining traditional congestion control for classic traffic, preventing L4S traffic from dominating the network and causing congestion for other applications.
2Reliability
If network buffers are expanded to reduce packet loss, then reliability improves, but latency increases for real-time applications
Solution Approach 1:
The patent applies local quality by implementing different buffer management strategies for L4S traffic versus classic traffic. L4S traffic receives preferential treatment with optimized buffer handling that minimizes latency, while classic traffic can utilize additional buffer capacity without impacting real-time performance. This differentiated approach allows the system to maintain low latency for interactive applications while improving overall packet loss reduction.
3Reliability
If congestion control mechanisms are implemented in RTP, then packet loss is reduced, but latency and jitter are introduced
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional congestion control parameters to scalable congestion control parameters specific to L4S traffic. The system uses ECN (Explicit Congestion Notification) and other L4S-specific mechanisms that modify how congestion is detected and responded to, enabling packet loss reduction without the significant latency and jitter penalties of conventional RTP congestion control.
Data Source
AI summary
Low- to ultralow-latency content delivery via real-time transport protocol (RTP) is provided. In an example, transport packets, which carry a packetized elementary stream (PES), are selectively marked based on frame size. More particularly, if a number or size of packets needed to transport a picture or PES packet exceeds a threshold, they are marked for preferential processing, such as low latency, low loss, and scalable throughput (L4S) processing. If the number or size of packets is below the threshold, they are marked for default or non-preferential processing. The marking may be applied to entire pictures, tiles, and/or slices. Related apparatuses, devices, techniques, and articles are also described.