A Protocol Composition-Based Approach to QoS Control in Collaboration Systems

This paper considers the problem of application-level QoS control in group collaboration systems. The QoS parameters considered, latency, jitter, packet-loss, and asynchrony, are controlled by the receiver. The QoS control is based on a novel protocol composition-based approach, wherein the protocol is modularized such that each module controls a single QoS parameter. Each module is then assigned a priority and the modules are composed such that the actions taken by a module do not violate a QoS parameter controlled by a higher priority module. This allows for more exible QoS control. The performance of the approach is evaluated through experiments, which illustrate how the compositions are able to successfully tradeoo the QoS parameters in an appropriate manner.