Coordination of multimedia services and applications in mobile, heterogeneous network environment
FacultiesFakultät für Ingenieurwissenschaften und Informatik
LicenseStandard (Fassung vom 03.05.2003)
Multiple services within the current Internet display common characteristics, especially in cases of coding of audio and video media. In order to achieve harmonization, future generations of networks and services need to address the increasingly important challenges of cross bridging of networks, mobility management and Quality of Service (QoS) provisioning for different kinds of multimedia-supporting services. Current mechanisms for providing QoS cover predominantly single facets of the global QoS management. However, QoS is a system aspect that crosses all components and layers of a distributed multimedia system. Consequently, the control mechanisms for service management turn to be increasingly complex with the growing system heterogeneity and the service users and providers should be prepared to dynamically exchange and evaluate possible system configurations in different network environments and scenario situations. The major topic of this work is the specification and the implementation of the End-to-End Negotiation Protocol (E2ENP). The protocol represents a novel approach to manage multimedia services in mobile and heterogeneous network environments, different from the currently existing static service-coordination methods. Significant parts of the work are devoted to the optimization of the control signalling for distributed multimedia services. Furthermore, alternative scenarios for service adaptation were developed and investigated to achieve other adaptation possibilities then the currently available sender-receiver adaptation. The resulting description language and control operations of E2ENP support different negotiation modes and phases that cover the requirements of different service and network environments and support different service scenarios. The concept of the protocol is proven through the implementation of the E2ENP User Agent and through the evaluation of the agent’s performance in different negotiation roles and service scenarios.
Subject HeadingsDienstgüte [GND]
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