CORBA evaluation of video streaming w.r.t. QoS provisioning

Describes the design, implementation and evaluation of CORBA- and socket-based continuous media (CM) systems. TCP/IP is not suitable for distributed applications which require high network bandwidth and timing criticality. UDP/IP is one of the alternatives. However, due to the fact that UDP is a lossy protocol, many issues arise when implementing distributed CM applications. Most of the QoS (quality of service) metrics known so far assume that the communication channel is lossless. In this paper, since we use UDP for CM data transmission, we adopt a new QoS metric that is applicable to lossy streams to evaluate the performance of our CM server. To reduce QoS loss factors and drift factors, we adopt a new strategy, called the QoS-driven dropping mechanism, for the CM server. Besides the traditional C-socket (TCP-UDP/IP) based CM server mechanisms, we implemented our CM server on CORBA. It turns out that the CORBA-based implementation runs considerably slower than the UDP-version, but faster than the TCP version