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Group applications like the audioconference require a minimum level of quality of service for the adequate transmission of voice packets and the improvement of the signaling processes for joining, maintaining and leaving multicast groups. Traditionally, SIP servers have dealed with unicast signaling and have also been supported by IP multicast facilities described within the SDP payload information...
Nowadays WiMax is becoming one of the main standards for the next generation wireless transmission systems. It provides QoS mechanism, but it needs performance optimization and evaluation and it is very difficult to make coverage prediction. This paper is about QoS estimation methods and measurements over WiMax networks. It presents first performance measurements about achievable rates for data or...
Nowadays low cost UMTS and HSDPA mobile networks and broadcast systems such as DVB-T and DVB-H lead to an increase of multimedia broadcasted services. The new standard for broadcast over mobiles, DVB-H, needs service reliability. This issue is tricky, because in a broadcast transmission, the sender may not be able to receive all acknowledgements from all users in order to retransmit as in TCP. Moreover...
To distribute risk in Grid, the design of service level agreements (SLAs) plays an important role, since these contracts determine the price for a service at an agreed quality level as well as the penalties in case of SLA violation. This paper proposes a price function over the quality of service(QoS) on the basis of the agreements negotiated upon price and quality objective. This function defines...
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