01539nas a2200121   4500008004100000245007500041210006900116300001500185520104200200100002101242700002201263856013201285       2003                        eng d00aMultimedia Transmission with Adaptive QoS based on Real Time Protocols0 aMultimedia Transmission with Adaptive QoS based on Real Time Pro  a 225 - 2483 aIn this paper, we describe a mechanism for adaptive transmission of multimedia data, which is based on
real-time protocols. The proposed mechanism can be used for unicast or multicast transmission of
multimedia data over heterogeneous networks, like the Internet, and has the capability to adapt the
transmission of the multimedia data to network changes. In addition, the implemented mechanism uses an
inter-receiver fairness function in order to treat the group of clients with fairness during the multicast
transmission in a heterogeneous environment. The proposed mechanism uses a ‘friendly’ to the network
users congestion control policy to control the transmission of the multimedia data. We implement a
prototype application based on the proposed mechanism and we evaluate the proposed mechanism both in
unicast and multicast transmission through a number of experiment and a number of simulations in order
to examine its fairness to a group of clients and its behaviour against transport protocols (TCP) and UDP
data streams.1 aBouras, Christos1 aGkamas, Apostolos  uhttp://telematics.upatras.gr/telematics/publications/multimedia-transmission-adaptive-qos-based-real-time-protocols?language=el