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检索条件"任意字段=Conference on Multimedia Computing and Networking"

共 2919 条记录，以下是91-100 订阅

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Sub-carrier assignment for multimedia traffic over OFDM wireless channel

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

引用

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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Third-Party AAA Framework and Signaling in UCWW

Third-Party AAA Framework and Signaling in UCWW

引用

7th International conference on Wireless Communications, networking and Mobile computing (WiCOM)

作者： Tairov, Dmitry Ganchev, Ivan O'Droma, Mairtin Univ Limerick Ctr Telecommun Res Limerick Ireland

ISBN: (纸本)9781424462520

This paper treats the signaling needs which will satisfy the requirements of the novel Third-Party Authentication, Authorization and Accounting (3P-AAA) framework. The main 3P-AAA interfaces and candidate signaling protocols are described. Some aspects of the integration of the proposed 3P-AAA framework with the currently existent 3GPP IP multimedia subsystems (IMS) are also considered.

关键词： Ubiqutous consumer wireless world (UCWW) Consumer-centric business model (CBM) Third-Party authentication authorization and accounting (3P-AAA) IP multimedia subsystem (IMS) signaling protocol

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A fuzzy call admission control scheme in cellular multimedia networks

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

引用

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...

引用

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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Interference-Aware Multipath Routing Protocol for Video Transmission over ZigBee Wireless Sensor Networks

Interference-Aware Multipath Routing Protocol for Video Tran...

引用

International conference on multimedia computing and Systems (ICMCS)

作者： Bidai, Zahia Maimour, Moufida Oran Univ Lab Res Ind Comp & Networking LRIIR El Mnaouar Algeria Lorraine Univ CRAN UMR 7039 F-54506 Vandoeuvre Les Nancy France CNRS CRAN UMR 7039 F-75700 Paris France

ISBN: (纸本)9781479938247

The IEEE 802.15.4/ZigBee technology is emerging as an important wireless sensor networking solution for short and medium range communication due to its numerous advantages. On the other hand, multimedia applications have gained increasing popularity that gives us the opportunity to improve this technology to support video transmission. In limited bandwidth ZigBee networks (250 kbps at 2.4 GHz), how to increase the throughput in constrained environments has become the main challenge. Multi-path becomes a crucial feature in supporting video transmission. Using simultaneous multiple paths provides the bandwidth requirements of multimedia applications. Unfortunately, concurrent transmission creates the problem of inter-path interference mainly due to the broadcast nature of the underlying medium. In this paper, we propose an interference-minimized multipath routing to facilitate MPEG-4 video transmission over ZigBee-based WSNs. This latter is evaluated using comparison with an interfering multipath routing version and the single path routing under different video frame rates. Results show that the proposed interference-aware multipath routing for Zig Bee-based WSNs can dramatically reduce the level of interference and thus maximize the overall throughput and improve the received video quality.

关键词： IEEE 802.15.4/ZigBee MPEG-4 video Multipath routing Interference Performance evaluation

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A multimedia OBJECT EXCHANGE MANAGER FOR A DISTRIBUTED multimedia SYSTEM

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

引用

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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Energy-Efficient Layered Content Dissemination for Multi-Mode Mobile Devices

Energy-Efficient Layered Content Dissemination for Multi-Mod...

引用

1st International Black Sea conference on Communications and networking (BlackSeaCom)

作者： Gur, Gurkan Alagoz, Fatih Bogazici Univ SATLAB Dept Comp Engn Istanbul Turkey

ISBN: (纸本)9781479908578

An energy efficiency based model of content-based access schemes for multi-radio mobile user devices is developed. The content is layered video consumed by the end device. The mobile devices are assumed to have an "asymmetric" interface structure: a satellite interface and a terrestrial interface for wireless multimedia networking. The terrestrial interface utilizes multi-hop transmission with opportunistic access schemes while the satellite interface provides a lower bitrate but simpler and less power-hungry transmission.

关键词： mobile computing mobile radio multimedia communication telecommunication power management

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Cloud computing-Conversion Technology for Interoperability

Cloud Computing-Conversion Technology for Interoperability

引用

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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Trust Service Selection in Pervasive computing

Trust Service Selection in Pervasive Computing

引用

1st International conference on multimedia Information networking and Security (MINES 2009)

作者： Wang, Xiaoying Chen, Yingge Xu, Benlian Changshu Inst Technol Dept Comp Sci Changshu 215500 Peoples R China

ISBN: (纸本)9780769538433

This paper describes the establishment and estimation of trust relation, and put forward a kind of trust service selection model in pervasive computing environment. Through direct and indirect trust relation evaluation, preference adjustment and trust update, a sound trust service evaluation system is set up which has been tested in smart UPS network system and shows a better performance.

关键词： pervasive computing service selection trust

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IP Packet Header Compression and User Grouping for LTE multimedia Broadcast Multicast Services

IP Packet Header Compression and User Grouping for LTE Multi...

引用

International conference on computing, networking and Communications (ICNC)

作者： Jiang, Chen Wu, Wenhao Ding, Zhi Univ Calif Davis Dept Elect & Comp Engineer Davis CA 95616 USA

ISBN: (纸本)9781509045884

multimedia Broadcast Multicast Service (MBMS)(1) is an efficiency cellular strategy for shared content delivery, widely popular in Long Term Evolution (LTE) networks. Typical multimedia IP packets possess redundantly large headers, relying on Robust Header Compression (ROHC) for efficiency boost. This work investigates the adaptation of ROHC schemes for MBMS. We formulate and solve the optimization problem of transmission efficiency maximization in point-to-multipoint (P-t-M) transmission mode. Based on this solution, we propose a new MBMS scheme, namely point-to-multigroup (P-t-MG) transmission in which MBMS aim user groups. We provide a grouping and parameter optimization algorithm for P-t-MG to achieve high efficiency under total radio resource constraints. Numerical results demonstrate the advantage of the optimized P-t-M and the P-t-MG schemes over conventional MBMS.

关键词： Optimization Markov processes Context Computational modeling Channel models Synchronization Wireless communication multimedia broadcast multicast service channel model CARRIER SYSTEM Computational modeling Markov chain User groups Header Long Term Evolution Local thermodynamic equilibrium IP packet

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