NexTech 2021 Congress
October 03, 2021 to October 07, 2021 - Barcelona, Spain

  • UBICOMM 2021, The Fifteenth International Conference on Mobile Ubiquitous Computing, Systems, Services and Technologies
  • ADVCOMP 2021, The Fifteenth International Conference on Advanced Engineering Computing and Applications in Sciences
  • SEMAPRO 2021, The Fifteenth International Conference on Advances in Semantic Processing
  • AMBIENT 2021, The Eleventh International Conference on Ambient Computing, Applications, Services and Technologies
  • EMERGING 2021, The Thirteenth International Conference on Emerging Networks and Systems Intelligence
  • DATA ANALYTICS 2021, The Tenth International Conference on Data Analytics
  • GLOBAL HEALTH 2021, The Tenth International Conference on Global Health Challenges
  • CYBER 2021, The Sixth International Conference on Cyber-Technologies and Cyber-Systems

SoftNet 2021 Congress
October 03, 2021 to October 07, 2021 - Barcelona, Spain

  • ICSEA 2021, The Sixteenth International Conference on Software Engineering Advances
  • ICSNC 2021, The Sixteenth International Conference on Systems and Networks Communications
  • CENTRIC 2021, The Fourteenth International Conference on Advances in Human-oriented and Personalized Mechanisms, Technologies, and Services
  • VALID 2021, The Thirteenth International Conference on Advances in System Testing and Validation Lifecycle
  • SIMUL 2021, The Thirteenth International Conference on Advances in System Simulation
  • SOTICS 2021, The Eleventh International Conference on Social Media Technologies, Communication, and Informatics
  • INNOV 2021, The Tenth International Conference on Communications, Computation, Networks and Technologies
  • HEALTHINFO 2021, The Sixth International Conference on Informatics and Assistive Technologies for Health-Care, Medical Support and Wellbeing

NetWare 2021 Congress
November 14, 2021 to November 18, 2021 - Athens, Greece

  • SENSORCOMM 2021, The Fifteenth International Conference on Sensor Technologies and Applications
  • SENSORDEVICES 2021, The Twelfth International Conference on Sensor Device Technologies and Applications
  • SECURWARE 2021, The Fifteenth International Conference on Emerging Security Information, Systems and Technologies
  • AFIN 2021, The Thirteenth International Conference on Advances in Future Internet
  • CENICS 2021, The Fourteenth International Conference on Advances in Circuits, Electronics and Micro-electronics
  • ICQNM 2021, The Fifteenth International Conference on Quantum, Nano/Bio, and Micro Technologies
  • FASSI 2021, The Seventh International Conference on Fundamentals and Advances in Software Systems Integration
  • GREEN 2021, The Sixth International Conference on Green Communications, Computing and Technologies

TrendNews 2021 Congress
November 14, 2021 to November 18, 2021 - Athens, Greece

  • CORETA 2021, Advances on Core Technologies and Applications
  • DIGITAL 2021, Advances on Societal Digital Transformation

 


ThinkMind // International Journal On Advances in Telecommunications, volume 8, numbers 3 and 4, 2015 // View article tele_v8_n34_2015_8


ConEx Performance Evaluation and Application to Video Streaming

Authors:
Ali Sanhaji
Philippe Niger
Philippe Cadro
André-Luc Beylot

Keywords: ConEx; Performance; ECN; Congestion; Policing; YouTube; LEDBAT.

Abstract:
With Internet traffic ever increasing, network congestion should occur more and more frequently. During congestion periods, some users contribute more than others to the congestion in the network. It might be interesting for a network operator to differentiate between users proportionally to the congestion they induce, but the necessary information for this purpose is not available at the network layer, and is exchanged at the transport layer (e.g., Transmission Control Protocol (TCP) acks). This led the Internet Engineering Task Force (IETF) to design Congestion Exposure (ConEx), a new mechanism to expose to the network the amount of congestion a user is responsible for, allowing the network operator to improve the fairness between users. ConEx is designed to limit the added complexity, leveraging already existing mechanisms such as Random Early Detection (RED) and Explicit Congestion Notification (ECN), plus a number of modifications to the senders and receivers to be fully operational. Nonetheless, ConEx can also be deployed in a simplified mode of operation, relying only on loss information in DropTail queues to estimate congestion. The objective of this paper is to provide an in depth evaluation of ConEx mechanism. Firstly, we investigate how the setting of ConEx parameters (e.g., congestion policer) and the network configuration (e.g., router queuing, network delay, etc.,) impact the behavior of ConEx and influence its ability to improve fairness between users. Secondly, we compare the level of performance, in terms of fairness improvement, provided by different variants of ConEx of increasing complexity, i.e., from a simple implementation with modifications limited to the sender to a “full” ConEx approach implementing all proposed features. We show that, despite a reduced accuracy in congestion estimation, a simple variant of ConEx is already able to provide a good fairness improvement between users. This is particularly interesting in the context of an initial deployment scenario, allowing an incremental deployment of ConEx. Thirdly, we investigate and discuss the limitations and weaknesses presented by ConEx with regard to short-lived flows. Finally, based on a YouTube traffic model, we illustrate how ConEx can help to enhance the Quality of Experience (QoE) of video streaming users during congestion periods, significantly reducing the number and duration of stalling events.

Pages: 202 to 214

Copyright: Copyright (c) to authors, 2015. Used with permission.

Publication date: December 30, 2015

Published in: journal

ISSN: 1942-2601

SERVICES CONTACT
2010 - 2017 © ThinkMind. All rights reserved.
Read Terms of Service and Privacy Policy.