DOCSIS Packet Latency Control for Minimum Jitter
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Solution Overview
Problem
Existing DOCSIS standards lack a standardized method for identifying and prioritizing low-latency traffic, leading to inefficiencies in managing latency-sensitive applications, particularly in CATV systems, and do not adequately address jitter variations, which are critical for applications like online gaming and video conferencing.
Innovation Solution
Implementing a cloud-hosted low-latency DOCSIS (LLD) agent that identifies low-latency traffic characteristics, or 'fingerprints', and communicates these to a network-hosted agent to process packets appropriately, using Type of Service fields or Access Control Lists to ensure low-latency traffic is routed efficiently, while also managing jitter through consistent latency and queue management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If client devices or gateways mark latency-sensitive traffic, then traffic prioritization is achieved, but hardware complexity and dependency on specific gateway implementations increase
Solution Approach 1:
The network infrastructure itself (CMTS, RPDs, RMDs) performs traffic identification and prioritization automatically using DOCSIS QoS mechanisms, eliminating the need for external gateway marking. The system self-services by monitoring traffic patterns and applying prioritization rules natively within the cable network, making the solution independent of specific gateway hardware or software implementations.
2Loss of time
If separate low-latency service flows are created, then latency is reduced, but jitter variation increases without proper management
Solution Approach 1:
The system implements feedback mechanisms where the CMTS and network elements continuously monitor latency and jitter metrics for low-latency service flows. Based on this feedback, the system dynamically adjusts scheduling parameters, buffer sizes, and resource allocation to maintain consistent jitter performance while preserving low latency. This closed-loop control ensures that latency-sensitive applications receive stable, predictable performance.
3Productivity
If distributed access architecture is used, then processing is decentralized, but coordination overhead and latency management complexity increase
Solution Approach 1:
The patent implements a universal DOCSIS QoS framework that operates consistently across centralized CAA and distributed DAA architectures. The same QoS mechanisms, service flow definitions, and prioritization rules apply regardless of whether processing is centralized at the CMTS or distributed to RPDs and RMDs. This multi-functionality allows the system to handle both architectures with a single solution, reducing coordination overhead through standardized interfaces and protocols.
Data Source
AI summary
Systems and methods for relaying a plurality of data packets to and from a subscriber over an access network that imparts a variable latency of one packet relative to other packets. The latency of each packet is controlled so as to increase the average latency experienced by the plurality of packets and decrease the variance of the respective latencies experienced by each of the packets.