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4th International conference on Wireless Communications, networking and Mobile computing

作者： Lu Meilian Wang Lei Zhou Xing BUPT State Key Lab Networking & Switching Technol Beijing Peoples R China

ISBN: (纸本)9781424421077

IMS is a core subsystem that provides multimedia services in the next generation network. The architecture of IMS specifies a series of functional entities. In order to analyze and research the performance of IMS network and services more quickly and conveniently, an IMS simulation system model based on NS2 is proposed, the design and implementation of the key issues are given. Some simulation scenarios are designed to verify the validity of system implementation. By analyzing the simulation results, we can conduct the deployment of the actual system and evaluate the feasibility of performance optimization schemes for network and services.

关键词： IP multimedia Subsystem Network Simulation Session Iniatal Protocol Application Server PoC Service Presence Service

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Communication Architectures and Algorithms for Media Mixing in multimedia conferences

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IEEE-ACM TRANSACTIONS ON networking 1993年第1期1卷 20-30页

作者： Rangan, P. Venkat Vin, Harrick M. Ramanathan, Srinivas Univ Calif San Diego Dept Comp Sci & Engn Multimedia Lab La Jolla CA 92093 USA

Advances in computer and communication technologies have stimulated the integration of digital video and audio with computing, leading to the development of computer-assisted multimedia conferencing. We address the problem of media mixing which arises in teleconferencing applications such as teleorchestra. We present a mixing algorithm which minimizes the difference between generation times of the media packets that are being mixed together in the absence of globally synchronized clocks, but in the presence of jitter in communication delays on packet switched networks. The algorithm is shown to be complete: given that there are no other message exchanges except media data between mixers and media sources, there cannot be any other algorithm that succeeds when our algorithm fails. Mixing can be accomplished by several different communication architectures. In order to support applications such as teleorchestra, which involve a large number of participants, we propose hierarchical mixing architectures and show that they are an order of magnitude more scalable compared to purely centralized or distributed architectures. Furthermore, we present mechanisms for minimizing the delays incurred by mixing in various communication architectures. We have implemented the mixing algorithms on a network of workstations connected by Ethernets, and have experimentally evaluated the performance of various mixing architectures. These experiments revealed interesting results such as the maximum number of participants that can be supported in a conference.

关键词： .Delays media packets media data multimedia Conferencing Communication Architectures Algorithms for Media multimedia conferences tele-orchestra mixing algorithm generation times number of participants

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Swarm: A multimedia delivery network for highly dynamic networking environments

Swarm: A multimedia delivery network for highly dynamic netw...

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conference on multimedia computing and networking 2005

作者： Denney, JC Race, NJP Univ Lancaster Distributed Multimedia Res Grp Dept Comp Lancaster England

ISBN: (纸本)0819456535

This paper presents the experimental design and implementation of Swarm, an integrated and scalable multimedia delivery platform. Swarm offers the adaptability, maintainability and scalability required to effectively support diversity in network and client access, including the provisioning for mobile devices. Based upon a topologically aware peer-to-peer substrate, comprised of a distributed set of cooperating nodes and a novel routing schemata, Swarm allows for the effective maintenance of multimedia transactions despite the dynamic properties introduced by wireless and mobile systems. We present the Swarm design, with particular emphasis on how the system maintains content and structural integrity whilst adaptability and dynamic stresses are prevalent. Finally, the experimental implementation of Swarm is discussed together with an analysis of its performance.

关键词： peer-to-peer media systems mobility content delivery networks Internet data streaming delivery and wide-area caching

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MUSIK: multimedia Service Integration Framework for Smart Environments

MUSIK: Multimedia Service Integration Framework for Smart En...

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3rd IEEE Consumer Communications and networking conference

作者： Kothari, Rakesh Ganz, Aura Univ Massachusetts Amherst MA 01003 USA

ISBN: (纸本)9781424400850

In this paper we present MUSIK, a multimedia, Service Integration frameworK to address two important problems associated with smart environments: user mobility and multi-device content delivery. We define multimedia service integration as the concept of intelligently delivering multimedia content and services to a mobile-user equipped with multiple networked computing devices. We argue that the middleware layer is the best place to address this problem and design MUSIK as a pro v based middleware framework. The MUSIK framework relies on the Session Initiation Protocol (SIP) as the basis to provide session mobility for real-time multimedia applications. We also present a prototype implementation of MUSIK and validate user-mobility and multi-device content delivery scenarios through its deployment over real-network test bed.

关键词： multimedia systems

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Models for multimedia conference between Browsers based on WebRTC

Models for Multimedia Conference between Browsers based on W...

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IEEE 9th International conference on Wireless and Mobile computing, networking and Communications (WiMob)

作者： Elleuch, Wajdi Univ Sfax Natl Engn Sch Sfax Dept Comp Sci & Appl Math Sfax Tunisia

ISBN: (纸本)9781457720147

Several models and architectures are proposed to support multiparty communication over IP. Even if some of these solutions support large number of participants using a conference server, solutions that base their media distribution on peers are adapted to support only small conferencing groups. Deploying multimedia communication based on WebRTC API for more than browser-to-browser connection is not inherently supported and creates new challenge in terms of media stream distribution as well as membership and conferencing operation control overhead. Many conference models presented in this paper can support multi-party communication between end-points over an IP networks. Otherwise, the use of WebRTC technology require direct P2P media negotiation between participants as well as signaling interaction with the Server to manage the conference. This paper introduces two specific conference models adapted to support WebRTC communication between browsers for both small scale and large scale conference. The proposed abstract protocols included in this work implements conference creation and browser joining/leaving and can be mapped using SIP/DSP primitives.

关键词： VoIP WebRTC streaming application multiparty communication media distribution conference models tree-based distribution fully-coupled conference control

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Sub-carrier assignment for multimedia traffic over OFDM wireless channel

Sub-carrier assignment for multimedia traffic over OFDM wire...

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2nd IEEE International conference on Wireless Communications, networking and Mobile computing (WiCOM 2006)

作者： Meng, Wenwu Zhu, Guangxi Liu, Zhichong Huazhong Univ Sci & Technol Elect & Informat Engn Dept Wuhan 430074 Peoples R China

ISBN: (纸本)9781424405169

With the rapid growth of wireless access to the Internet, there has been an increasing demand in providing high data rate real time traffic such as audio and video over wideband wireless channels. However, the transmitted multimedia traffic experience frequency-selective fading in wideband wireless channels. By dividing the wideband channel into several smaller sub-channels and sending multimedia traffic in parallel orthogonal sub-channels, which is widely known as orthogonal frequency division multiplexing (OFDM), the frequency-selective channel can be transformed into a set of frequency-flat channels. OFDM has become a prospective technique for the next generation wireless communications. In this paper, we analyze the effect of sub-carrier assignment on the transmitted multimedia traffic. By increasing the number of sub-carriers, each sub-channel behaves practically as a quasic-static one, such that frequency-selective fading and intersymbol interference (ISI) can be alleviated. The multiplexing of sub-carriers is introduced to combat the variability of wireless channel, but the performance of wireless channel would also be degraded. We present a quality assessment of audio and video traffic over OFDM wireless channel based on sub-carrier assignment. Simulation results show that proper sub-carrier assignment could significantly reduce errors during high rate multimedia transmission.

关键词： sub-carrier OFDM multimedia traffic

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A fuzzy call admission control scheme in cellular multimedia networks

A fuzzy call admission control scheme in cellular multimedia...

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International conference on Wireless Communications, networking and Mobile computing

作者： Ma, YF Hu, XL Zhang, YY Zhao, ED Huazhong Univ Sci & Technol Dept Elect & Informat Wuhan 430074 Peoples R China

ISBN: (纸本)078039335X

Scarcity of the spectrum resource and mobility of users make Quality-of-Service (QoS) provision a critical issue in cellular mobile multimedia networks. This paper presents a fuzzy call admission control scheme to meet the requirement of the QoS while prioritizing handoff call requests over new call requests. It searches automatically the number of the guard channel in a base station to make an effective use of resource and guarantee the QoS provision. A performance measure is formed as a weighted linear function of new call and handoff call blocking probabilities of each service class. Simulation compares the proposed fuzzy scheme with some well-known policies. Simulation results show that fuzzy scheme has a better robust performance in terms of average blocking criterion.

关键词： call admission control fuzzy cellular multimedia networks Quality of Service

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Real time testbeds for 5G NSA and SA mobile architectures to provide VoLTE and VoNR services over IP multimedia Core Network Subsystem 18

Real time testbeds for 5G NSA and SA mobile architectures to...

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18th International conference on Wireless and Mobile computing, networking and Communications (WiMob)

作者： Abularach Arnez, Jussif J. Lima Damasceno, Maria G. Gomes Dos Reis, Renata K. Pessoa, Larissa Da Silva Sidia Inst Sci & Technol Manaus Amazonas Brazil

ISBN: (数字)9781665469753

ISBN: (纸本)9781665469753

The contribution of this work is the deployment of real time testbeds for the 5G NSA (Non-StandAlone) and the 5G SA (StandAlone) mobile architectures to provide both Voice over LTE (VoLTE) and Voice over New Radio (VoNR) services. In addition, an IMS (IP multimedia Subsystem) core network was deployed to provide voice over IP services. The delay, the throughput and the jitter quality of services metrics are also computed, which allow analyzing and comparing the results between both 5G network architectures.

关键词： 5G IMS VoNR VoLTE

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A multimedia OBJECT EXCHANGE MANAGER FOR A DISTRIBUTED multimedia SYSTEM

A MULTIMEDIA OBJECT EXCHANGE MANAGER FOR A DISTRIBUTED MULTI...

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conference on multimedia computing and networking 1995

作者： XIANG, JX CHANG, HJ KAO, CS CHANG, SK UNIV PITTSBURGH DEPT COMP SCIPITTSBURGHPA 15260

ISBN: (纸本)0819417645

We use the smart multimedia object concept to design a Distributed multimedia System (DMS). A key module in the system is the Object Exchange Manager (OEM). In this paper, we present the design and implementation of the OEM module and discuss in detail the interaction between the Object Exchange Manager and other modules in the DMS system. An example is given to show the application of the DMS system. © 1995 SPIE. All rights reserved.

关键词： DISTRIBUTED multimedia SYSTEMS OBJECT EXCHANGE ACTIVE multimedia SYSTEMS

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Cloud computing-Conversion Technology for Interoperability

Cloud Computing-Conversion Technology for Interoperability

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4th International conference on multimedia Information networking and Security (MINES)

作者： Yu, Zekun Hefei Univ Technol Sch Management Hefei Peoples R China

ISBN: (纸本)9780769548524

Though the current cloud computing is in its initial stage of development, some established players, such as Amazon, Google, ***, have captured market shares with their own strategies and standards. However, for a further development for this immature market, it has been proposed a general standard (like TCP/IP for internet) among cloud participants. There are some standards under drafting, but it seems impractical for established players to agree on a general one, for they already have their own standards. What's more, the ongoing creation in the industry undermines standardization;On the other hand, each cloud provider is taking an active role in making its own API, for instance VMware's vCloud, an open standard, but the cost is consumers' lock-in. Thus, conversion technology seems to have a brighter future than standardization towards achieving interoperability. This study discusses various issues concerning the realization of interoperability by conversion technology. Primarily, an economic model is used for reference to analyze the market's incentive to adopt such technology, especially in such a market with network effects. Then a sequence of issues regarding technique, economy, management, security and politics are put forward and discussed, ending with an outlook for the industry. These discussions have important implications for realization of interoperability under the current condition where standardization is somewhat costly and impractical.

关键词： cloud computing conversion technology standardization network effects interoperability

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