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检索条件"任意字段=Conference on Multimedia Computing and Networking 2006"

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COS: A Configurable OS for Embedded SoC Systems

COS: A Configurable OS for Embedded SoC Systems

引用

IEEE International conference on Embedded and Real-Time computing Systems and Applications (RTCSA)

作者： Hsin-hung Lin Chih-Wen Hsueh Real-Time Systems Laboratory Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan Embedded System and Wireless Networking Laboratory Graduate Institute of Networking and Multimedia and Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

As the increasing of system performance and computing power, embedded systems are more complicated and interactive. Therefore, operating system (OS) plays a more important role in embedded systems to utilize various hardware and software resources. However, no OS can meet all requirements of various embedded systems. Due to the advance of reconfigurable processors, system requirements can be more dynamic. Embedded OS has becoming more critical in the development of embedded systems and thus there is a strong need of configurable embedded OS to better and faster build up the target system. In this paper, we propose a configurable OS, called COS, based on SOA (service-oriented architecture) for embedded SoC (system on a chip) systems to build an application specific OS according to the system requirements. COS can be easily configured to better utilize the resources of the target embedded platform and have better support to the embedded application. Moreover, the COS can easily extend new features or functionalities of other OSes and even be adapted to the designs of other OSes. We implement COS on an ARM platform to prove its configurability and also evaluate its overhead. We believe that COS can be configured to meet the various requirements in embedded SoC systems and help to speed up the embedded system development process

关键词： Embedded system Kernel System-on-a-chip Service oriented architecture Operating systems Real time systems Laboratories Computer science Power engineering and energy System performance

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SIPCache: A Distributed SIP Location Service for Mobile Ad-Hoc Networks

SIPCache: A Distributed SIP Location Service for Mobile Ad-H...

引用

International conference on Mobile and Ubiquitous Systems: networking and Services (MobiQuitous)

作者： Simone Leggio Hugo Miranda Kimmo Raatikainen Luis Rodrigues University of Helsinki Finland University of Lisbon Portugal

Internet-based communication is currently in a hype. People utilize Internet services more and more to communicate with each other, e.g., via VoIP or chat. The next step would be to reutilize the same applications to achieve ubiquitous communication, anytime and anywhere, also where network support is not available, such as in ad-hoc networks. Existing Internet protocols must be modified for working in the ad-hoc server-less environment. The session initiation protocol (SIP) is a fundamental element in the Internet for establishing multimedia communication sessions. However, SIP cannot be used in ad-hoc networks, as it relies on the support of SIP servers in the network; e.g, in ad-hoc networks it is not possible to locate SIP users since the assistance of a dedicated SIP server is missing. A solution for this problem is presented in this paper, which describes and evaluates a fully decentralized mechanism for locating SIP users in ad-hoc networks

关键词： Ad hoc networks Protocols Network servers Web server Mobile communication Internet Mobile ad hoc networks Ubiquitous computing Information retrieval Broadcasting

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An Adaptive Non-preemptive Scheduling Framework for Delay Bounded Traffic in Cellular Networks

An Adaptive Non-preemptive Scheduling Framework for Delay Bo...

引用

conference on Local Computer Networks (LCN)

作者： Yaser Khamayseh Ehab S. Elmallah Department of Computing Science University of Alberta Edmonton Canada

Provisioning multimedia streaming services to mobile users in next generation wireless networks is considered critical to the successful deployment of such networks. Streaming traffic is characterized by the need of relatively high data transmission rates, and the need to limit the wireless network delays during transmission. Such factors contribute to the importance of the design and use of scheduling mechanisms that work at the streaming connection level to manage network resources. In this paper, we consider the problem of designing schedulers that aim at maximizing the achieved throughput subject to constraints on the maximum acceptable delay that can be tolerated by each traffic stream. We propose an adaptive scheduling framework for the non-preemptive delivery of traffic streams in cellular networks where a fixed number of channels are allocated to streaming services. The obtained simulation results indicate the competitiveness of the proposed design when used online to control traffic, and the usefulness of the underlying algorithms when used offline to analyze traffic traces

关键词： Adaptive scheduling Telecommunication traffic Land mobile radio cellular systems Communication system traffic control Traffic control Streaming media Wireless networks Algorithm design and analysis Next generation networking Data communication

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Implementing a Native IMS Location Service Enabler over a Prototypical IMS Core Network Testbed

Implementing a Native IMS Location Service Enabler over a Pr...

引用

IEEE International conference on e-Commerce Technology (CEC)

作者： P. Reichl S. Bessler J. Fabini R. Pailer J. Zeiss Telecommunications Research Center Vienna Vienna Austria University of Technology Vienna Vienna Austria Mobilkom Vienna Austria

The imminent introduction of the 3GPP IP multimedia Subsystem (IMS) into commercial mobile networks is considered to be a major step towards all-IP based next generation networks. This has immediate consequences both for the migration of the core network as well as the integration of future mobile services and applications. This paper presents an experimental testbed which has been designed as a minimal standard-compliant IMS core network. We discuss major practical requirements and describe our implementation of this "IMS in a bottle" approach. Furthermore, we introduce an IMS native location service enabler based on the IMS presence system and demonstrate that this service can be integrated efficiently into the IMS core environment

关键词： Prototypes Next generation networking Quality of service Context-aware services IP networks Circuits Service oriented architecture System testing Performance analysis Time measurement

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Performance Analysis of a P2P-Based VoIP Software

Performance Analysis of a P2P-Based VoIP Software

引用

Advanced International conference on Telecommunications (AICT)

作者： Gao Lisha Luo Junzhou Department of Computer Science and Engineering South-East University Nanjing China

With the development of network, multimedia will be the main application in next generation network. Voice is one of the most important applications. Recently a kind of P2P-based VoIP software, Skype, has been receiving more and more attention both in academia and industry. Skype claims that it's better than other VoIP software, because of its high call completion rate and superior sound quality. This paper will reveal Skype's technique and have a performance comparison between Skype and MSN Messenger, which uses traditional VoIP protocol. The result indicates that the voice quality of Skype is no better than traditional VoIP software and the great benefit of P2P involved with VoIP is that it can solve NAT and firewall problems.

关键词： Performance analysis Internet telephony Software performance Peer to peer computing Application software Protocols Software quality Computer science Next generation networking Computer industry

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mSCTP Connection Setup Method to Mobile Node Using Connection Setup Proxy

mSCTP Connection Setup Method to Mobile Node Using Connectio...

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International conference on Computer and Information Technology (CIT)

作者： Kwang-ryoul Kim Seung-kuck Kim Sung-gi Min Department of Computer Science and Engineering Korea University of Technology and Education Seoul South Korea

Mobile Stream Control Transmission Protocol (mSCTP) is recently proposed to support mobility in the transport layer without requiring additional network components. mSCTP provides mobility to all applications that use mSCTP as a transport protocol. However, current mSCTP does not include location management service and can not make connection from a Corresponding Node (CN) to a Mobile Node (MN) without assistance of other mobile protocols. We propose mSCTP proxy which supports making an mSCTP connection from the CN to the MN. Proposed mSCTP proxy performs an address transformation by direct interoperation with generic location management service and forward connection set up messages to the MN. Using the proposed proxy, mSCTP can provide a complete mobility support including a connection setup and maintaining an existing connection.

关键词： Transport protocols Mobile computing Tunneling Computer science Application software Next generation networking Wireless networks IP networks multimedia systems Network servers

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Web Services based SOA for Next Generation Telecom Networks

Web Services based SOA for Next Generation Telecom Networks

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IEEE International conference on Services computing (SCC)

作者： Abhijit Sur Dean Skidmore Shoma Chakravarty Advisory Solutions Architect Communications Sector IBM Sales and Distribution USA NGN/SDP/IMS Communications Sector IBM Sales and Distribution USA Senior Solutions Architect IBM Global Business Services USA

Summary form only given. Network operators are now on a journey towards a next generation network (NGN) built on horizontal "planes", moving away from traditional vertical structure networks for fixed voice and data communication networks. IP multimedia subsystem (IMS) is a part of wider network transformation to next generation (NG) networks. The IMS core network has a common IP based transport plane and a common signalling or control plane, and it can be accessed by different access networks. IMS provides a control layer based on an end-to-end based session initiation protocol (SIP) that can control a session and remain agnostic of the access network. This innovation in the telecom industry where more intelligence is moving to the edge, can be closely linked to another innovation in the IT industry, where applications are being rendered as re-usable components, or services as we may refer to them. Such components, when made available on the Web are referred to as Web services. IBM's service enablement solution in the NGN space is based on three strategic tenets. First of all, it makes use of the common IP transport plane and the Web services realization mechanism as a backbone for composite services within a single session. This would help network operators to generate revenue in a converged telecom network. Secondly, it uses Web services to automate the entire lifecycle of a service. This leads to automation of the service delivery platform (SDP), which in turn allows third party application providers to deploy services by using the services exposed by network provider. Finally, as premium composite services are deployed to the end user, he/she would have a higher quality of experience (QoE). IMS provides a per-subscriber control of QoS as part of QoE. As the subscriber uses various composite services, the IMS ability to control QoE/QoS, becomes a huge differentiator for IMS over just uncontrolled access over the Internet. In other words, IMS QoE encompasses QoS,

关键词： Web services Service oriented architecture Next generation networking Telecommunication control Communication system control Technological innovation Communication industry Quality of service Data communication Access protocols

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Experimental Evaluation of Application Performance with 802.11 PHY Rate Adaptation Mechanisms in Diverse Environments

Experimental Evaluation of Application Performance with 802....

引用

2006 IEEE Wireless Communications and networking conference (WCNC 2006), vol.4

作者： Yi Yang Mahesh Marina Rajive Bagrodia Mobile Systems Laboratory Computer Science Department University of California Los Angeles USA

We examine the impact of physical layer rate adaptation mechanisms on the performance of real applications over 802.11 wireless links in diverse channel environments. Our evaluations are based on a testbed with real wireless devices equipped with commodity 802.11 hardware and a hardware channel emulator. We consider two different and well-known 802.11 rate adaptation mechanisms (Onoe and SampleRate) and study their performance under several realistic workloads, including multimedia streaming and web browsing. We observe that the application performance with different rate adaptation mechanisms is dependent on the specific tradeoffs these mechanisms make at the link layer in an application-oblivious manner between improving throughput and limiting frame loss. More importantly, their relative performance for a given workload is quite sensitive to the channel quality and environment. These observations highlight the importance of choosing the rate selection strategy adaptively in an application and channel aware manner.

关键词： Physical layer Throughput Testing Hardware Wireless LAN Application software Streaming media multimedia systems Performance loss Mobile computing

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Quality of service monitoring in multimedia network

Quality of service monitoring in multimedia network

引用

conference on multimedia computing and networking 2003

作者： Mao, GQ Habibi, D Univ Sydney Sch Elect & Informat Engn Sydney NSW 2006 Australia

ISBN: (纸本)0819448192

Different from traditional data traffic, multimedia traffic has stringent requirements on quality of service (QoS). For multimedia networking, a prime concern is to ensure that there are adequate network resources to meet the QoS requirements of multimedia traffic. In order to make effective traffic and congestion control, and network management, in-service QoS monitoring and estimation (ISME) has to be employed as opposed to the conventional out-of-service monitoring and testing techniques. In this paper, an ISME scheme is proposed. Virtual buffer techniques are employed in the ISME scheme to reduce the monitoring time required to make a valid observation of QoS. Simulation using both voice traffic source model and real variable bit rate video traffic is performed. Simulation results show that the proposed scheme is able to achieve better accuracy than that in the literature. Moreover, it also requires less monitoring time than that in the literature.

关键词： quality of service in-service monitoring and estimation cell loss ratio

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Creating New Learning Experiences on a Global Scale 1

引用

丛书名： Lecture Notes in Computer Science

1000年

ISBN: (数字)9783540751953

ISBN: (纸本)9783540751946

You are holding more than 500 pages of combined wisdom on Technology Enhanced Learning (TEL) in your hands! With the advance of metadata, standards, learning objects, Web 2. 0 approaches to rip, mix and burn learning, wikis, blogs, syndication, user-generated content, W- based video, games and the ubiquitous availability of computing devices we can and have to offer more flexible learning services on a global scale. As one of the objectives of the 7th Framework Program of the European Commission puts it: We need “responsive environments for technology-enhanced learning that motivate, engage and inspire learners, and which are embedded in the business processes and human resources management systems of organizations. ” An important challenge is to form a bridge between informal learning strategies of the knowledge society and formal competence development programs of organizations. After the success of EC-TEL 2006, the 2nd European conference on Technology Enhanced Learning (EC-TEL 2007) provided a unique forum for all research related to technology enhanced learning, including its interactions with knowledge management, business processes and work environments. This is a competitive and broad forum for technology enhanced learning research in Europe and world-wide through specialized workshops, the doctoral consortium and the main conference. EC- TEL 2007 provided unique networking possibilities for participating researchers throughout the week and included project meetings and discussions for ongoing and new research activities supported by the European Commission.

关键词： Computers and Education multimedia Information Systems User Interfaces and Human Computer Interaction Artificial Intelligence Information Systems Applications (incl. Internet)

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