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International conference on Wireless Broadband and Ultra Wideband communications (AusWireless)

作者： Niklas Blum Fabricio Carvalho de Gouveia Thomas Magedanz Fraunhofer Institute of Open Communication Systems (FOKUS) Berlin Germany

Modern telecommunication networks and classical roles of Operators are subject to fundamental changes. Standardization bodies and Industry are specifying and integrating next generation Network (NGN) infrastructures and NGN services based on an all IP paradigm. The Internet Engineering Task Force (IETF), European Telecommunications Standards Institute (ETSI), Third generation Partnership Project (3GPP), 3GPP2 and Open Mobile Alliance (OMA) are working on technological issues to enable services using Internet technology and Service Orientated Architectures (SOA). Furthermore, first thoughts on the architectural and bearer evolution of NGN is taking place under the notion of Long Term Evolution (LTE) and System Architecture Evolution (SAE). This paper reports about our approach of extending the existing IP Multimedia Subsystem (IMS) Playground @ FOKUS towards a LTE/SAE testbed and two prototypic services, a single network agnostic Voicemail application and a 3G circuit-switched to packet-switched handover scenario as a proof-of-concept for the environment.

关键词： LTE SAE 3GPP ETSI TISPAN IP Multimedia Subsystem next generation networks Service Delivery Platform

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A new multi-channel real-time digital signal processing platform for acoustic signal processing and sensor response emulation

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Journal of Physics: conference Series 2007年第1期76卷

作者： Gaydecki, Patrick School of Electrical and Electronic Engineering University of Manchester Manchester M60 1QD PO Box 88 United Kingdom

In recent years, the DSP group at the University of Manchester has developed a range of DSP platforms for real-time filtering and processing of acoustic signals. A next generation system has now been designed, which incorporates a processor operating at 0.55 Giga MMACS, six input and eight output analogue channels, digital input/output in the form of S/PDIF and a USB interface. The software allows the user, with no knowledge of filter theory or programming, to design and run standard or completely arbitrary FIR, IIR and adaptive filters. Processing tasks may be described and linked using the graphical icon based interface. In addition, the system has the capability to emulate in real-time linear system behaviour such as sensors, instrument bodies, string vibrations, resonant spaces and electrical networks. Tests have confirmed a high degree of fidelity between the behaviour of the physical system and its digitally emulated counterpart. In addition to the supplied software, the user may also program the system using a variety of commercial packages via the JTAG interface. © 2007 IOP Publishing Ltd.

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Unified Protocol Stack Architecture for 4G Mobile Terminals to Support Multiple Radio Access Technologies

Unified Protocol Stack Architecture for 4G Mobile Terminals ...

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Privacy, Security and Trust, PST,2008 6th Annual conference on;Pomona,CA

作者： S. Vijay Anand Rajesh Tyagi CTOs Office SASKEN Communication Technologies Limited Bangalore India

The next generation Mobile Handhelds need to focus on seamless Mobility and session continuity when the subscribers move frequently across different radio access networks. This paper presents a Generic Radio Access Abstraction layer (GRAAL) outlining the additional functionalities required at the mobile terminal that can decide on the fly for selecting the best radio access network according to the users choice and applications preferences. The proposed GRAAL will enable subscribers to benefit from high throughput and to maintain session continuity during roaming across several mobile networks.

关键词： QoS GPRS UMTS WLAN Seamless mobility Vertical Handover Dual-mode Multi-mode Unified Protocol Stack

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The impact of SARA for further advances in Automotive Microwave Sensing

The impact of SARA for further advances in Automotive Microw...

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37th European Microwave conference (EUMC 2007), vol.4

作者： Gerhard Rollmann Hans-Ludwig Bloecher GR-Consulting Tamm Germany Group Research & Advanced Engineering DaimlerChrysler Aerospace Ulm Germany

During the next years, the number of wireless sensor and communication systems used in cars for ubiquitous applications will increase significantly. The operational frequencies will span from the Low Frequency range (9kHz) up to the mmWave (79GHz) range, the bandwidth from narrowband band to Ultra-Wide Band (UWB). Increasingly, however, the electromagnetic spectrum represents a scarce natural resource of strategic national socio-economic importance. Careful international spectrum engineering and regulation is required, in order to ensure coexistence between existing and planned services. Automotive applications traditionally have used free and unlicensed ISM (Industrial, Scientific, Medical) bands, which will be overcrowded in the future. Therefore, the automotive industry needs dedicated frequency allocations for future applications. UWB is one of the most promising new concepts for automotive applications. The SARA (Short range Automotive Radar frequency Allocation) group was founded by the automotive industry in 2001, a newcomer in the field of frequency management SARA's activities focused on international frequency regulation and standardization of UWB automotive short range radar (SRR) for advanced driver assistance and safety applications. As a result of successful SARA activities, the market introduction of these sensors started with the Mercedes-Benz S-class in 2005, followed by BMW's introduction of SRR in 2007 in the 5-series. The SARA group has expanded the focus of its activity from UWB SRR to general frequency needs for automotive radar. With this new focus, SARA has become the Strategic Automotive Radar Frequency Allocation group. This contribution gives an overview on actual and planned wireless sensing systems used in cars and on the necessary spectrum resources for the technologies to be applied. Finally, the current and planned activities of the SARA group are outlined.

关键词： Automotive engineering Radio spectrum management Frequency Wireless sensor networks Automotive applications Ultra wideband radar Wireless communication sensor systems and applications Bandwidth Narrowband

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HASN: a power saving and reliable communication paradigm for sensor networks

HASN: a power saving and reliable communication paradigm for...

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conference on next-generation communication and sensor networks 2006

作者： Zhang Qiang Zhao Zheng Zhang Jie Zhao Zhichao Wang Song Tianjin Univ Sch Elect Informat Engn Tianjin Peoples R China Worcester Polytech Inst Dept Comp Sci Worcester MA 01609 USA

ISBN: (纸本)0819464856

HASN is a hierarchical routing protocol for heterogeneous sensor networks, optimized via cross-layer designs to save sensor's power and improve reliability. There are two kinds of nodes in heterogeneous sensor networks: normal sensor and header node that has more powerful battery and higher performance antenna. A header and sensors in its radio transmitting range compose a cluster. The header takes charge of data collection and data aggregation in its cluster. In a cluster, the communication is unsymmetrical. From the header to sensors is directly reachable, but from sensors to their header needs multi-hop. In this paper, a new dynamic address assignment method is introduced for large number of sensors automatically. A mathematics model of energy optimum relay tree is designed, which can guarantee the minimum energy cost forwarding and relay load balance. We give an approximation algorithm to resolve the model. A centralized scheduling management is proposed to avoid collisions completely in a cluster. We also introduce a mechanism to depress data redundancy.

关键词： power saving heterogeneous sensor network routing protocol load balance

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Leading the way with EU Research - next generation wireless sensor networks - The e-SENSE Project

Leading the way with EU Research - Next generation wireless ...

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IET Wireless sensor networks conference

作者： Babb, Derek University of Surrey Centre for Communication Systems Research Guildford United Kingdom

ISBN: (纸本)0863417051

This paper discusses the e-SENSE project, which is the next generation wireless sensor networks. The e-SENSE system will use a combination of enabling technologies, provide seamless and nomadic user access to new classes of applications, capture an unprecedented level of detail of context, use body, object and environment sensor networks, and interact with and link to beyond 3G network and service platforms. Some of the e-SENSE research challenges are presented.

关键词： Wireless sensor networks

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A new wavelength assignment scheme for supporting QoS in Optical Burst Switching networks

A new wavelength assignment scheme for supporting QoS in Opt...

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conference on next-generation communication and sensor networks 2006

作者： Li, Li Zhang, Zhizhong Wang, Fu Chongqing Univ Posts & Telecom Dept Commun Engn Chongqing 400065 Peoples R China

ISBN: (纸本)0819464856

Conventional approaches to QoS (Quality of Service) provisioning in IP networks are difficult to apply in all-optical networks. This is mainly because there is no optical RAM (Random Access Memory) to store packets during contention for bandwidth, so the provision of QoS with OBS (Optical Burst Switching) is a hot issue that has been widely studied. Most of the QoS schemes guarantee the performance of high priority traffic at the cost of low priority traffic's performance. To solve this problem, a novel wavelength assignment scheme for supporting QoS in OBS networks is proposed in this paper, we give the detailed means to increase the priority of the buffed low priority bursts and show it is especially beneficial to improve networks average throughput than that of offset-time-based scheme.

关键词： Optical Burst Switching wavelength assignment priority Quality of Service

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A Fast Resilient Routing Protocol with Energy Efficiency for Wireless sensor networks

A Fast Resilient Routing Protocol with Energy Efficiency for...

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Joint International conference on Optical Internet (COIN)/next generation Network (NGNCON)

作者： Kim, Jae-Hyun Kim, Seog-Gyu Lee, Jai-Yong Yonsei Univ 134 Shinchon Dong Seoul 120749 South Korea

ISBN: (纸本)9781424435913

Generally, single path routing is simple and consumes less energy than multi-path routing, but it will cost a lot to re-delivery when the data delivery fails. However, multi-path routing supports high delivery ratio and load balancing, but its traffic is very high and the redundant traffic is burden to the whole networks. In this paper, we introduce a novel routing scheme for wireless sensor networks, so called, the highly energy aware resilient routing scheme (HEAR). Our scheme establishes partial disjoint multi-paths to support high robustness and energy efficiency.

关键词： Energy efficiency

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Pattern-based communication: A new paradigm for energy-aware wireless networks 2

Pattern-based communication: A new paradigm for energy-aware...

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2nd International conference on Information and communication Technologies: From Theory to Applications, ICTTA 2006

作者： Taherkordi, Amirhosein Taleghan, Majid Alkaee Sharifi, Mohsen Computer Engineering Department Iran University of Science and Technology Iran

ISBN: (纸本)0780395212

The low resource availability in the nodes of recent wireless networks has raised several new issues in the design of their hardware and software components. One of the high level approaches for optimizing resource usage in these networks is to reduce the number of communications among wireless nodes. In this paper, we propose a new paradigm for optimizing the number of data transmissions between nodes according to new attributes of next generation networks with wireless, energy-aware and data-centric features. We nickname our approach Pattern-Based communication. In pattern-based communication, every client issues its interest about receiving data according to some predefined patterns. If the set of data satisfies a pattern condition then the node sends the result of processing of this set of data to every client who is interested instead of sending all of them in turn. We evaluated our solution in a cluster-based wireless sensor network and show how the proposed communication model could optimize resource consumptions in sensor nodes. © 2006 IEEE.

关键词： next generation networks

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Reliability evaluation model for multi-states WDM networks

Reliability evaluation model for multi-states WDM networks

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conference on next-generation communication and sensor networks 2006

作者： Fan Hehong Sun Xiaohan Southeast Univ Dept Elect Engn Lab Photon & Opt Commun Nanjing 210096 Jiangsu Peoples R China

ISBN: (纸本)0819464856

With optical networks evolving to the next generation optical networks, various services are intended to be carried over a single optical network infrastructure. This contributes to the phenomenon that different services with different QoS requirements may survive in a set of degradative network working-states. Thus during the study of optical network reliability, it is insufficient to regard optical networks as having only binary working-states according to their network connectivity. We proposes here a new reliability evaluation model for WDM networks, which regard the network as a system having multiple working-states with reference to their route (s-t) capacity and maximum hop number constraints. Additionally, considering that there exist in WDM networks some elements whose failures affect neither the nodes nor the entire links but only certain wavelength channels in the links, a new kind of network element is added to the traditional element types (nodes and links) of network reliability evaluation model, namely wavelength channel related elements. The model was used to simulate the reliability of WC (wavelength continuous), PWC (partial wavelength conversion) and NWC (non-wavelength continuous) WDM networks with CERNET topology by way of Monte-Carlo method. Simulation results indicate that different working-state requirements may lead to different reliability evaluation results, and the differences will enlarge very quickly with the increasing of network element failure rates. This implies that the study of WDM network reliability should be performed under multiple working-states assumption, especially for multi-service networks, and the addition of the new network element kind - a wavelength channel-related element is necessary.

关键词： multiple working-states WDM network network reliability wavelength channel-related elements

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