The Guarantees Of Quality Of Service And Resource Management For Distributed Multimedia Systems

The distributed multimedia system is bora with developments of multimedia technology, computer technology and networks technology. It will result in many multimedia applications. The key issue is how to guarantee the Quality of Service (QoS) for multimedia applications in distributed multimedia systems. This paper has done a lot of researches on Quality of Service management and resource management as follows.1 This paper discusses QoS definition, QoS parameters, QoS management process and QoS management structure.2 This paper discusses the distributed multimedia operating systems. The research includes scheduling algorithm and resource management based on the analysis of traditional operating systems improvements. Many traditional operating systems are not suitable for multimedia applications. A jitterless scheduling algorithm DMSr that removes step by step based on the pinwheel model with distance constraints is presented in this paper. The issue of minimizing the total end-to-end delay about DMSr is discussed too. Some methods of resource management are presented including the resource management and synchronization for uncompressed multimedia streams based on the session; the resource management for priority multimedia stream based on the priority session; the algorithm of accessing shared resources based on the precedence session and the quasi-normality; the resource management for compressed and variable bit rate multimedia stream based on the VBR session; the adaptive algorithm for adapting QoS based on the adaptive session; the resource management and admission control for compressed multimedia stream on multimedia servers based on the server session.3 This paper outlines service models and protocols for multimedia communications on the Internet such as Integrated Service (Int-Serv), Differentiated Service (Diff-Serv), Multiprotocol Label Switching (MPLS), IPv4, IPv6, ST-II and RTP. Their advantages and disadvantages are discussed.4 This paper discusses the guarantees of multimedia QoS in wireless and mobile networks. For the reliable communication for multimedia in wireless networks, this paper analyzes the minimum average end-to-end delay based on acknowledgment-repeat-request (ARQ) protocol and forward error correction (FEC) and formalizes the relation between the best size of packet-sent, bit-error-rate (BER) and the number of header bits per packet when the end-to-end delay is minimal. Algorithms of the best packet size and minimal bandwidth for minimum average delay of multimedia stream are presented in this paper. For QoS management in mobile networks, this paper presents that QoS management should have adaptation, the separation of routing, signaling and forwarding; in-band signaling; soft-state resource management. The structure and state machine of soft-state resource management are presented.