Abstract
Excessive and unpredictable end-to-end latency is a major problem for today’s Internet performance, affecting a range of applications from real-time multimedia to web traffic. This is mainly attributed to the interaction between the TCP congestion control mechanism and the unmanaged large buffers deployed across the Internet. This dissertation investigates transport and link layer solutions to solve the Internet’s latency problem on the access links. These solutions operate on the sender side, within the network or use signaling between the sender and the network based on Explicit Congestion Notification (ECN). By changing the sender’s reaction to ECN, a method proposed in this dissertation reduces latency without harming link utilization. Real-life experiments and simulations show that this goal is achieved while maintaining backward compatibility and being gradually deployable on the Internet. This mechanism’s fairness to legacy traffic is further improved by a novel use of ECN within the network.
List of papers
Paper I Naeem Khademi, Michael Welzl, Renato Lo Cigno. On the Uplink Performance of TCP in Multi-rate 802.11 WLANs. NETWORKING 2011, Part II, LNCS 6641, pp. 368–378, 2011. The article is not available in DUO due to publisher restrictions. The published version is available at: https://doi.org/10.1007/978-3-642-20798-3_28 |
Paper II Naeem Khademi, Michael Welzl, Stein Gjessing. Experimental Evaluation of TCP Performance in Multi-rate 802.11 WLANs. World of Wireless, Mobile and Multimedia Networks (WoWMoM), 2012 IEEE International Symposium on a. 2012. The article is not available in DUO due to publisher restrictions. The published version is available at: https://doi.org/10.1109/WoWMoM.2012.6263696 |
Paper III Grenville Armitage, Naeem Khademi. Using Delay-Gradient TCP for Multimedia-Friendly ‘Background’ Transport in Home Networks. Local Computer Networks (LCN), 2013 IEEE 38th Conference on. 2013. The article is not available in DUO due to publisher restrictions. The published version is available at: https://doi.org/10.1109/LCN.2013.6761285 |
Paper IV Naeem Khademi, David Ros, Michael Welzl. The New AQM Kids on the Block: Much Ado About Nothing? Technical Report 434, Department of Informatics, University of Oslo. The paper is available in DUO: http://urn.nb.no/URN:NBN:no-38868 |
Paper V Naeem Khademi, Michael Welzl, Grenville Armitage, Chamil Kulatunga,
David Ros, Gorry Fairhurst, Stein Gjessing, Sebastian Zander. Alternative Backoff: Achieving Low Latency and High Throughput with ECN and AQM. To be published. The paper is not available in DUO awaiting publishing. |
Paper VI Naeem Khademi, Michael Welzl and Stein Gjessing. Improving the Fairness of Alternative Backoff
with ECN (ABE). To be published. The paper is not available in DUO awaiting publishing. |