The experience record in smart space is an useful service for education activities, either for the purpose of course review or multimedia courseware creation. In this paper, we present the concept of collaborative experience record according to the new feature of pervasive computing paradigm. A supporting platform is implemented to enable the rapid prototyping of experience record applications ...

In this paper we present and evaluate a hybrid-modular multiple access protocol for ATM transmission in a multiservice satellite system. Given appropriate synchronization and Doppler (shift) compensation, the protocol components can cope with the dynamics of the satellite constellation and are suitable to both mobile and fixed user environments. The general protocol framework is first given wit...

This paper studies the Quality of Service QoS guarantees of totally ordered multicast algo rithms The paper shows that totally ordered multicast can coexist with guaranteed predictable delays in certain network models The paper considers two reservation models constant bit rate CBR and variable bit rate VBR For these models the paper presents totally ordered multicast algorithms that preserve t...

We propose and analyze a class of admission control algorithms based on reward optimization for multimediaservers designed to provide on-demand services to clients in an environment where workload characteristics of clients can change dynamically. These admission control algorithms are developed based on two strategic choices, namely, \deterministic" or \best-eeort" regarding quality of service...

Abstract: The core aspect of most multimedia applications is the transmission of Variable Bit Rate (VBR) video streams requiring a sustained relatively high bandwidth with stringent Quality of Service (QoS) guarantee. In such systems, a statistical bandwidth estimation is especially relevant as it is indispensable for implementing an efficient admission control. In this paper a novel measuremen...

In this paper, a CBR transport scheme for VBR MPEG-2 video-on-demand traffic in ATM networks is proposed. The basic idea is to smooth the VBR traffic to match a given bandwidth. In order to keep the continuous playback of the video, our scheme requires a suitable amount of buffer space at the receiver side and introduces an initial playback delay. We study these two performance measures as func...

Variable bit rate (VBR) video traffic with high data rate is expected to be the largest proportion of traffic carried by future wireless home networks. In order to guarantee quality-of-service (QoS) requirements of such type of VBR video traffic and improve channel utilization, this paper proposes an on-line measurement-based admission control scheme. The proposed scheme is designed based on th...

A dynamic reservation time division multiple access (DR-TDMA) control protocol that extends the capabilities of asynchronous transfer mode (ATM) networks over the wireless channel is proposed in this paper. DR-TDMA combines the advantages of distributed access and centralized control for transporting constant bit rate (CBR), variable bit rate (VBR), and available bit rate (ABR) traffic efficien...

This paper presents an experimental approach for QoS-aware and bandwidth-efficient transmission of multimedia sources over ATM networks. VBR video sources are statistically multiplexed at the application level. Usage Parameter Control (UPC) values of a single connection for the aggregate traffic are dynamically calculated and renegotiated with the network during the session lifetime. New source...