A Survey of Quality of Service in Mobile Computing Environments

Accepted versio

Ensuring High Availability of Distributed Multimedia Applications

Multimediaapplicationsare characterized by QoS (quality of service) requirements which depend on the quality of video and audio transmitted to the client, and the respect of time constraints associated to video and audio data. Much work has been done in order to provide system support that meets these requirements. However, existing proposals do not integrate the consequence of failure occurrence on QoS. In this paper, we address this issue by introducing a resource reservation model that integrates availability requirements. Our design goals for this model were: ffl to allow programmers to reserve resources with respect to various QoS requirements including availability; ffl to preserve the transparency of mechanisms used for availability; This paper details the resulting model together with its integration in a distributed system. 1 Introduction Recent advances in computing, like high-speed networks and data-compression make distributed multimedia applications a challenging appli..

A proposal for Ensuring High Availability of Distributed Multimedia Applications

Recent advances in computing, like high-speed networks and data-compression, make extensible distributed multimedia applications a challenging application-domain of distributed systems. Such applications like VoD (Video on Demand) or real-time conferencing are characterized by QoS (quality of service) requirements which depend on the quality of video and sound transmitted to the client and on the respect of time constraints associated to video and audio data. Much work has been done in order to provide system support aimed at meeting these requirements. However, existing proposals do not integrate the consequence of failure occurrence on the guaranteed QoS. To deal with this issue, we propose a resource reservation model that integrates availability requirements of multimedia services in addition to the QoS constraints introduced above. Our paper details the resulting model together with its integration in a distributed system. In particular, we show how the model implementation can be..