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International conference on Transparent Optical networks

作者： E. Leitgeb M. Loschnigg U. Birnbacher G. Schwarz A. Merdonig Institute of Broadband Communication Technical University of Graz Graz Austria Carinthia University of Applied Sciences Spittal Austria ML11 EDV-Dienstleistungen GmbH Graz Austria

In the last couple of years the need for higher data rates and more bandwidth has arisen. This development will continue in the next couple of decades and allegorizes a challenge for the future next generation networks. Taking this into account the end-user will need higher data rates, getting theoretical access to the full available bandwidth of the backbone delivered to the home. Free space optics (FSO) is an excellent supplement to conventional radio links and fiber optics, capable of handling point-to-point and point-to-multipoint connections. On the one hand-side FSO is a broadband wireless solution for the "last mile" connectivity in metropolitan networks, on the other hand-side FSO can be used to interlink locations within one local area network. In the last years different types of cost-effective systems were developed and realized at the Institute of Broadband communication of Graz University of Technology (TU Graz). The first type was based on a modular concept using available standard components allowing demonstrations at a data rate of 2 times 10 Mbit/s for short distances up to 300 m at a specific power margin of 25 dB/km. Later the units were improved to allow a data rate of 100 Mbit/s, higher data rates are currently under development. The reliability and availability of a FSO-link is mainly determined by the local atmospheric conditions, in free space the transmitted light is reflected, refracted or absorbed by objects, rain, fog, wind or sun. All these parameters directly influence the quality of a FSO-link and indirectly affect the quality of an access network. Many FSO-installations (permanent and nomadic use) have been set-up in the area of Styria by TU Graz and cooperation partners. In this contribution we will show some practical installations for different events, including the latest permanent installation, which was started in the summer of 2007 together with the municipality of Dobl, a small suburb of Graz, and the ML11 GmbH, an IT-company.

关键词： Buildings Optical fibers Fiber optics Optical network units Optical fiber communication Integrated optics Optical transmitters

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The cache-and-forward network architecture for efficient mobile content delivery services in the future internet

The cache-and-forward network architecture for efficient mob...

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Innovations in NGN: Future Network and Services, K-INGN, ITU-T Kaleidoscope Academic conference

作者： Sanjoy Paul Roy Yates Dipankar Raychaudhuri Jim Kurose WINLAB Rutgers University New Brunswick NJ USA Department of Computer Science University of Massachusetts Amherst USA

This paper presents a novel "cache-and-forward" (CNF) protocol architecture for mobile content delivery services in the future Internet. The CNF architecture can be implemented as an overlay on top of the Internet Protocol (IP), or as a clean slate protocol for next-generation networks. CNF is based on the concept of store-and-forward routers with large storage, providing for opportunistic delivery to occasionally disconnected mobile users and for in-network caching of content. The proposed CNF protocol uses reliable hop-by-hop transfer of large data files between CNF routers in place of an end-to-end transport protocol like TCP. This approach makes it possible to serve mobile users with intermittent connectivity, while also mitigating self- interference problems which arise in multi-hop wireless scenarios. Hop-by-hop transport is similarly useful in wired networks where router storage can help to smooth out link congestion bottlenecks which arise in TCP/IP networks. A second key feature of the CNF protocol is the integration of address- based and content-based routing to support various content delivery modes that take advantage of in-network storage. An overview of the CNF architecture and major protocol components is given, and preliminary performance evaluation results are summarized to validate the main design principles.

关键词： IP networks Web and internet services TCPIP Wireless application protocol Computer architecture Spread spectrum communication Mobile computing Transport protocols Costs Wireless sensor networks

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Multicasting Support for NEMO based on ODMRP

Multicasting Support for NEMO based on ODMRP

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ACIS International conference on Software Engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Seong-Yee Phang Chee-Min Yeoh HoonJae Lee Hyotaek Lim Department of Ubiquitous and IT Graduate School of Design and IT Dong Seo University Busan South Korea

ISBN: (纸本)9780769532639

In recent years, mobile network has evolved greatly with the existences of MANET, wireless sensor network, mobile IP, NEMO and etc. The advent of network mobility (NEMO) tends to provide seamless Internet connectivity to all the nodes within a mobile network regardless of their current points of attachment with the usage of a mobile router. Multicasting support is one of the key technologies in next generation network as well as in network mobility environment especially for multicast based group-oriented services. However, multicasting support remains to be a challenging problem in NEMO as the entire network with multicast service moves away. In addition, a nested NEMO environment prohibits the multicasting service from the parent-NEMO to the sub-NEMO to be supported completely. Thus, we propose and explain a proper solution with the adaption of a well known multicast routing protocol, on-demand multicasting routing protocol (ODMRP) to fully support multicasting in NEMO.

关键词： Mobile communication Routing protocols Mobile computing Protocols Mobile ad hoc networks Internet Manganese

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NETWORKING 2007 AdHoc and sensor networks, wireless networks, next generation internet: 6th international IFIP-TC6 networking conference Atlanta, GA, USA, may 14-18, 2007 proceedings 6th

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6th International IFIP-TC6 Networking conference, NETWORKING 2007

作者： Akyildiz, Ian F. Sivakumar, Raghupathy Ekici, Eylem McNair, Janise Georgia Institute of Technology School of Electrical and Computer Engineering AtlantaGA United States The Ohio State University Department of Electrical and Computer Engineering ColumbusOH United States Drexel University ECE Department Bossone 312 PhiladelphiaPA United States University of Florida Department of Electrical and Computer Engineering Gainesville FL United States

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Emerging wireless technologies

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IEEE WIRELESS communicationS 2007年第1期14卷 2-3页

作者： Jamalipour, Abbas Communications Switching and Routing Technical Committee Communications Switching and Routing Technical Committee

Presents the editorial for this issue of the publication.

关键词： Multiaccess communication Wireless communication OFDM Wideband next generation networking Australia

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Implementation of NFC technology for industrial applications:: case flexible production

Implementation of NFC technology for industrial applications...

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conference on next-generation communication and sensor networks 2007

作者： Sallinen, Mikko Strommer, Esko Ylisaukko-oja, Arto VTT POB 1100 Oulu 90571 Finland

ISBN: (纸本)9780819469335

Near Field communication (NFC) technology enables a flexible short range communication. It has large amount of envisaged applications in consumer, welfare and industrial sector. Compared with other short range communication technologies such as Bluetooth or Wibree it provides advantages that we will introduce in this paper. In this paper, we present an example of applying NFC technology to industrial application where simple tasks can be automatized and industrial assembly process can be improved radically by replacing manual paperwork and increasing trace of the products during the production.

关键词： near field communication industrial production short range communication

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A micro-payment architecture for P2P networks

A micro-payment architecture for P2P networks

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conference on next-generation communication and sensor networks 2007

作者： Zhang, Jie Zhao, Zheng Xiong, Xiao Shi, Qinwei Tianjin Univ Sch Comp Sci & Technol Tianjin 300072 Peoples R China

ISBN: (纸本)9780819469335

An important goal in P2P networks is that all peers provide resources. However, free riding and tragedy of common are real issues in P2P networks. To resolve these problems, most of the existing work is concerning probabilistic estimation to evaluate the trustworthiness or mechanism design to provide incentive. Instead of design a protocol to solve free riding, we build a micro-payment architecture for these existing protocols using virtual currency which can be more precisely measured and easily be replaced by reputation or other tokens. Our system can avoid from long-term trust learning interactions and high cost of collecting and analyzing reputation information. It can also provide peers incentive to truly report their connection type and security to malicious attacks.

关键词： peer-to-peer reputation micro-payment accounting

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Reliable energy-aware routing with unreliable links in ad hoc networks

Reliable energy-aware routing with unreliable links in ad ho...

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conference on next-generation communication and sensor networks 2007

作者： Bao, Yanru Shu, Yantai Wang, Xin Yu, Li Tianjin Univ Dept Comp Sci Tianjin 300072 Peoples R China

ISBN: (纸本)9780819469335

Since most ad hoc mobile devices today operate on batteries, energy-aware routings and power control techniques in wireless networks have drawn considerable research interests recently. This paper presents a reliable energy-aware routing algorithm (REARP) for unreliable ad hoc networks. The lifetime of the whole network and the energy cost for each packet are considered simultaneously in the routing processes of the REARP. Different from the formers, the energy cost of the link layer retransmission is also computed into the total energy consumption. Moreover, the REARP appropriately adjusts the transmission power by systematically integrating the reliability and power control techniques. We conducted extensive simulations to evaluate the performance of the new routing algorithms compared to a number of existing routing algorithms.

关键词： ad hoc networks energy-aware routing protocol

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Modeling of handover counting and location management for wireless mobile networks

Modeling of handover counting and location management for wi...

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conference on next-generation communication and sensor networks 2007

作者： Rodriguez-Dagnino, Ramon M. Takagi, Hideaki Tecnol Monterrey Ctr Elect & Telecomunicac Sucursal Correos J Monterrey 64849 NL Mexico Univ Tsukuba Grad Sch Syst & Informat Engn Tsukuba Ibaraki 3058573 Japan

ISBN: (纸本)9780819469335

Handover (or handoff) management is the set of actions that allows a wireless network to maintain a mobile user's connection as it moves through different cells during a call. The handover is typically done during a cell boundary crossing and all of the mobile terminal's connection information must be transferred into the new cell (or new base station). So, it is important to count the number of handovers made by a user during a call for proper network resources dimensioning and performance prediction. Location management is the set of actions aimed to find the current location of an inactive mobile user for call delivery. It implies the transmission of signaling messages for dynamic databases updates, paging, and so on. This problem is formulated in terms of cost optimization and it is mathematically related to handover counting. In this paper, we summarize many of the proposed model to deal with these problems, and we will be mainly focussed on the renewal process approach.

关键词： handovers location algorithms movement-based renewal theory

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tinyLUNAR: One-byte multihop communications through hybrid routing in wireless sensor networks

tinyLUNAR: One-byte multihop communications through hybrid r...

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7th International conference on next generation Teletraffic and Wire/Wireless Advanced Networking

作者： Osipov, Evgeny Lulea Univ Technol Dept Comp Sci & Elect Engn Campus Porson S-97187 Lulea Sweden

ISBN: (纸本)9783540748328

In this paper we consider a problem of implementing a hybrid routing protocol for wireless sensor networks, which natively supports data-centric, geographic-based and address-centric communication paradigms. We demonstrate the feasibility of such protocol by presenting tinyLUNAR, an adapted to the specifics of sensor networks reactive routing scheme originally developed for mobile wireless ad hoc networks. In addition to the support for several communications paradigms tinyLUNAR implements highly efficient multihop forwarding using only 1 B field that can be directly encoded in the standard IEEE 802.15.4 MAC header.

关键词： Wireless sensor networks

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