Multimedia transmission with adaptive QoS based on real-time protocols

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. Copyright # 2003 John Wiley & Sons, Lt

SRAMT-S: A Hybrid Sender and Receiver-Based Adaptation Scheme for TCP Friendly Multicast Transmission Using Simulcast Approach

In this paper, we describe a hybrid sender and receiver-based adaptation scheme for multicast transmission of multimedia data using the simulcast approach, which we call SRAMT-S (Sender-Receiver based Adaptation scheme for Multicast Transmission using Simulcast). The most prominent features of SRAMT-S are its distributed (to sender and receivers) transmission rate estimation algorithm and its innovative RTT (Round Trip Time) estimation algorithm based on one-way delay measurements. SRAMT-S is using both an AIMD algorithm and a TCP model in order to estimate a TCP friendly bandwidth share. We evaluate SRAMT-S through a number of simulations in order to examine its behaviour to a heterogeneous group of receivers and its behaviour against TCP connections. Main conclusion of the simulation was that SRAMT-S has friendly behaviour against the dominant traffic types of today's Internet and treats a heterogeneous group of receivers with fairness

Performance of Adaptive Multimedia Transmission: The case of Unicast Technique

Unicast mechanisms for the adaptive transmission of multimedia data can be used for the transmission of multimedia data over heterogeneous networks, like the Internet with the use of one unicast stream for each receiver. Those mechanisms have the capability to adapt the transmission of the multimedia data to network changes. In this paper, we describe a unicast mechanism for adaptive transmission of multimedia data, which is based on real time protocols. The proposed mechanism can be used for unicast 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. Moreover, the proposed mechanism uses a “friendly ” to the network users congestion control policy to control the transmission of the multimedia data. We evaluate the adaptive multicast transmission mechanism and we compare it with a number of similar mechanisms available to the literature (LBA, RAP, and TFRCP)