Summary: Multi­Session Rate Control for Layered Video Multicast
Xue Li \Lambda , Sanjoy Paul y , and Mostafa Ammar \Lambda
\Lambda: College of Computing, Georgia Tech, Atlanta,GA 30332, flixue, ammarg@cc.gatech.edu
y: Bell Laboratories, Holmdel, NJ 07733, sanjoy@dnrc.bell­labs.com
Abstract
In a video multicast session, the receivers may possess different capabilities or be connected
to the network through a variety of different access speeds. Multicasting video traffic at any
one rate to all of the receivers can be unfair as some receivers may experience high losses
while others find that their full reception capacity is not fully utilized. Layered video multicast
protocols have been developed to address this intra­session fairness problem. In such protocols
(e.g., RLM and LVMR), video is multicast in multiple layers over separate multicast groups.
Receivers join as many layers as they can handle. While protocols such as RLM and LVMR have
been shown to successfully address the intra­session fairness issue in video multicast, they do
not address the issue of inter­session fairness, i.e., fair sharing between multiple video sessions
and TCP sessions. In this paper, we demonstrate and develop insight into the inter­session
fairness problem through a set of simulation experiments. We then propose and evaluate end­
to­end procedures designed to promote inter­session fairness when used to augment layered video
multicast protocols. Finally, we consider how the use of network agents can be applied to further
improve the operation of these protocols.
1 Introduction

Source: Ammar, Mostafa - College of Computing, Georgia Institute of Technology

Collections: Computer Technologies and Information Sciences