[CPCC] SEMINAR: Multi-Packet Congestion Control 1/4 Monday 10 AM

[Ender Ayanoglu]

                              CPCC SEMINAR

               MPCP: Multi-Packet Congestion control Protocol

                                   by

                            Dr. Xiaolong Li

                        January 4, 2009, Monday
                                 10 AM
                        Engineering Gateway 3161

                                ABSTRACT

The coupling of fairness and efficiency is a major source of performance
degradation for TCP and AQM schemes, especially, in high Bandwidth-Delay
product networks. A pair of recently proposed protocols, XCP and VCP, can
achieve near zero congestion loss in wired networks by decoupling fairness
control from efficiency. While both protocols achieve comparable
performance, VCP exhibits more potential for deployment as it demands no
extra bits in IP header but two existing ECN bits. However, the feature
limited the accuracy of the feedback available for the sender (only three
congestion levels). Thus, VCP suffers from relatively low convergence
speed and extreme unfairness in moderate bandwidth high delay scenarios
due to the vagueness of its feedback. Multi-Packet Congestion Control
Protocol (MPCP) can provide more accurate feedback and yet keep utilizing
only two existing ECN bits. By distributing / extracting the congestion
related information into / from a serial of packets, MPCP is able to
circumvent the limitations that two ECN bits only support three congestion
levels, and thus offer more accurate feedback to the sender. MPCP has
demonstrated significant performance improvements in terms of efficiency
and fairness compared to VCP.

                           SPEAKER'S BIOGRAPHY

Xiaolong Li received his Ph.D. degree from the Department of Electrical
Engineering and Computer Science, University of California, Irvine in
2009. He is currently a postdoctoral researcher at the same department.
His research interests include congestion control in wireless networks
and cross-layer routing in Mobile Ad-Hoc Networks.