Escalated Expedited Forwarding Packet Marking for Network Congestion
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Solution Overview
Problem
Expedited Forwarding (EF) per hop behavior fails to intelligently manage latency and jitter in communication networks, particularly during packet transmission, leading to suboptimal performance for real-time media applications like audio and video due to network congestion and dynamic traffic changes.
Innovation Solution
The Escalated Expedited Forwarding (EEF) system determines latency and jitter associated with EF packets, marks congested packets for priority sequencing, and modifies per hop behavior to provide precedence over non-marked packets, while erasing marked packets if the ingress queue exceeds a threshold, thereby enhancing transmission speed and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Expedited Forwarding (EF) per hop behavior is used to ensure low jitter and low latency at intermediate nodes, then real-time media application performance is improved, but latency and jitter still occur during packet transmission due to network congestion and dynamic traffic changes
Solution Approach 1:
The patent implements dynamic per-hop behavior modification by monitoring packet delay metrics (delay, delay-variation, average delay) and adjusting packet marking and queuing behavior in real-time. The system dynamically changes packet handling from static EF marking to dynamic EEF marking based on current network conditions, allowing the network to adapt to changing traffic patterns and congestion levels.
Solution Approach 2:
The patent employs feedback mechanisms by measuring packet delay metrics at each hop and using this information to make informed decisions about packet marking and queuing. The system continuously monitors network performance and adjusts its behavior based on the measured delay characteristics, creating a closed-loop control system that responds to actual network conditions.
2Speed
If EF packets are marked with high priority to ensure precedence over other packets, then transmission speed is improved, but queue congestion increases when ingress queue exceeds threshold
Solution Approach 1:
The patent changes the priority parameter dynamically based on measured delay metrics. Instead of always marking packets with high priority EEF marking, the system only applies EEF marking when delay metrics indicate congestion or suboptimal performance. This parameter change approach allows the system to maintain high transmission speed when needed while avoiding unnecessary queue congestion during normal conditions.
Solution Approach 2:
The system performs self-service by autonomously monitoring its own performance metrics and making decisions about packet marking and queuing without external intervention. The network elements automatically measure their own delay characteristics and adjust their marking behavior accordingly, enabling self-optimization of packet transmission.
3Ease of operation
If all EF packets are treated with equal precedence, then queue management is simplified, but packets experiencing delay cannot be prioritized for correction
Solution Approach 1:
The patent applies local quality by treating different packets differently based on their specific delay characteristics. Instead of uniform treatment of all EF packets, the system identifies packets experiencing delay through metric measurement and applies EEF marking locally to only those packets that need prioritization. This selective approach maintains simplicity for the majority of packets while providing enhanced reliability for affected packets.
Data Source
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AI summary
An escalated expedited forwarding system, for modifying per hop behavior of one or more Expedited Forwarding (EF) packets for a session in a communication network, the system comprising: a memory; a processor coupled to the memory storing processor executable instructions which when executed by the processor causes the processor to perform operations comprising: determining, by an escalated expedited forwarding system, at least one of latency, jitter and average jitter associated with the one or more EF packets for the session; marking, by the escalated expedited forwarding system, one or more EF packets based on the at least one of latency, jitter and average jitter; and modifying, by the escalated expedited forwarding system, the per hop behavior of the one or more marked EF packets.