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IEEE Annual Joint conference: INFOCOM, IEEE Computer and communications Societies

作者： Lu Shen Ajay Todimala Byrav Ramamurthy Xi Yang Department of Computer Science and Engineering University of Nebraska Lincoln Lincolnshire NE USA Information Sciences Institute East University of Southern California Arlington VA USA

Lightpath scheduling is an important capability in next-generation wavelength-division multiplexing (WDM) optical networks to reserve resources in advance for a specified time period while provisioning end-to-end lightpaths. In this study, we propose an approach to support dynamic lightpath scheduling in such networks. To minimize blocking probability in a network that accommodates dynamic scheduled lightpath demands (D- SLDs), resource allocation should be optimized in a dynamic manner. However, for the network users who desire deterministic services, resources must be reserved in advance and guaranteed for future use. These two objectives may be mutually incompatible. Therefore, we propose a two-phase dynamic lightpath scheduling approach to tackle this issue. The first phase is the deterministic lightpath scheduling phase. When a lightpath request arrives, the network control plane schedules a path with guaranteed resources so that the user can get a quick response with the deterministic lightpath schedule. The second phase is the lightpath re-optimization phase, in which the network control plane re-provisions some already scheduled lightpaths. Experimental results show that our proposed two-phase dynamic lightpath scheduling approach can greatly reduce WDM network blocking.

关键词： Dynamic scheduling next generation networking Wavelength division multiplexing WDM networks Optical fiber networks Resource management Processor scheduling Lighting control Bandwidth Superluminescent diodes

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Architecture and performance of A next-generation Optical Burst Switch (OBS)

Architecture and Performance of A Next-Generation Optical Bu...

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International conference on Broadband networks (BroadNets)

作者： Muhammad T. Anan Ghulam M. Chaudhry Driss Benhaddou School of Computing and Engineering Computer Engineering Research Laboratory (CERL) University of Missouri Kansas City MO USA Engineering Technology Department University of Houston Houston TX USA

Optical burst switching (OBS) is a promising technique for next-generation optical switching networks which attempts to address the problem of efficiently allocating resources for bursty traffic. In traditional OBS, an entire burst is discarded when all output wavelengths are engaged at the arrival instant of the burst. A critical design issue in OBS is how to reduce burst dropping probability as a result of resource contention. This paper proposes new core node architecture to provide a combined impact for an effective scheduling algorithm that improves burst loss rate and utilization in OBS switches. The new design provides an effective optical burst switching for variable-length bursts with low complexity compared to several existing scheduling algorithms. A combined contention resolution approach of wavelength reassignment capability and limited delay is used.

关键词： Optical switches Optical burst switching Scheduling algorithm next generation networking Optical fiber networks Resource management Telecommunication traffic Optical losses Optical design Algorithm design and analysis

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A fault-tolerant protocol for railway control systems

A fault-tolerant protocol for railway control systems

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conference on next generation Internet networks, NGI

作者： J. Lloret F.J. Sanchez J.R. Diaz J.M. Jimenez Department of Communications Polytechnic University of Valencia Spain

Railway control systems are largely based on data communication and network technologies. With the adoption of Ethernet-IP as the main technology for building end-to-end real-time networks on railway control systems, the requirement to deliver high availability, quality and secure services over Ethernet has become strategic. Critical real-time traffic is generally penalized and the maximum restoration time of 50 msec sometimes is exceeded because of real-time applications hangings, so passengers' safety could be committed. It occurs on more than twenty percent of critical fail tests performed. Our main goal is to minimize restoration time from the application point of view. This article describes a protocol to improve critical real-time railway control systems. The algorithm designed gives us fast recoveries when railway computers fail down. The protocol permits to manage the railway control system from every computer in the network mixing unicast and multicast messages. Simulations obtained for a real railway line are shown. We have reached excellent results limiting critical failures recoveries to less than 50 msec

关键词： Fault tolerant systems Rail transportation control systems Communication system control Real time systems Multicast protocols Data communication communications technology Availability Ethernet networks

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A New SCTP mobility scheme supporting vertical handover

A New SCTP mobility scheme supporting vertical handover

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IEEE International conference on Wireless and Mobile Computing, Networking And communications (WiMob)

作者： A. Ezzouhairi A. Quintero S. Pierre Mobile Computing and Networking Research Laboratory LARIM Department of Computer Engineering Ecole Polytechnique de Montréal Montreal QUE Canada

Integration of heterogeneous networks constitutes the main concern of the next generation of mobile networks (4G). This integration is closely related to mobility management in the sense that a mobile user will move freely across mobile networks without connection disruption. Mobile IP based approaches suffers from drawbacks such as packet loss, high throughputs and handover latency. In this paper, we propose a new SCTP (stream control transmission protocol) mobility scheme supporting vertical handoff. The proposed scheme does not require any special infrastructure and presents less handoff latency compared to MIPv6 based approaches

关键词： Mobile radio mobility management Delay next generation networking Roaming Computer networks Internet Proposals Throughput Protocols Land mobile radio cellular systems

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SEMO: A Policy-based system for Handovers in Heterogeneous networks

SEMO: A Policy-based system for Handovers in Heterogeneous N...

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International conference on Wireless and Mobile communications (ICWMS 2006)

作者： Gustav Nyberg Christer Ahlund Tomas Rojmyr Department of Computer Science Umea University Umea Sweden LTU Skelleftea Lulea University of Technology Skelleftea Sweden TietoEntor Telecom and Media Skelleftehamn Sweden

A vision of future wireless networks is the coexistence of multiple access network technologies. Different access networks will coexist and the Internet Protocol will be the glue. To fulfil this vision, one of the greatest challenges is to develop sophisticated policies for vertical handovers. When and in what way the handovers are performed, affects the performance of the mobile services. Traditional handover policies are based on received signal strength comparison. To be able to support vertical handover, policies have to consider parameters such as capacity, utilization cost, power consumption, security and QoS guarantees. This paper describes a proposal for a policy-based vertical handover model for heterogeneous networks. Analysis, design, implementation and evaluation of "SEMO", a policy-based vertical handover system, are presented.

关键词： 3G mobile communication Wireless networks Costs next generation networking Wireless LAN Telecommunication traffic Traffic control Computer science Nonhomogeneous media IP networks

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Separating resource reservations from service requests to improve the performance of optical burst-switching networks

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IEEE JOURNAL ON SELECTED AREAS IN communications 2006年第4期24卷 95-107页

作者： Barakat, Neil Sargent, Edward H. Univ Toronto Dept Elect & Comp Engn Toronto ON M5S 3G4 Canada

In this paper, we introduce a new signalling architecture called Dual-header Optical Burst Switching (DOBS) for next generation burst-switching optical networks. DOBS decouples the resource reservation process from the. service request process in core nodes and allows for delayed scheduling to be implemented. This relaxes the constraints on burst scheduling operations and allows the offset sizes of bursts to be precisely controlled in core nodes without the use of fiber delay line buffers. This allows for increased flexibility, control, and performance. To demonstrate the benefit of delayed scheduling and core-node offset control, we examine the performance of a DOBS system in Which the offset size of every burst on a core link is set to a: constant value. Using simulation and analysis, We show that the resulting constant-scheduling-offset (CSO) system realizes lower ingress delay, higher throughput, and better fairness than conventional single-header OBS systems, while simultaneously requiring only O(1) burst scheduling complexity. In a 16-channel system with full wavelength conversion and no fiber delay line buffers, the CSO DOBS system achieved a blocking probability 56% lower than that of a similar LAUC-VF JET OBS system. The CSO DOBS system also achieved perfect fairness, both with respect to burst length and with respect to the residual path length of bursts.

关键词： delayed scheduling dual-header optical burst switching optical burst switching optical networks signalling architecture

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QoS class mapping over heterogeneous networks using Application Service Map

QoS class mapping over heterogeneous networks using Applicat...

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International conference on Systems and International conference on Mobile communications and Learning Technologies, (ICN/ICONS/MCL) International conference on Networking

作者： Mi Sun Ryu Hong-Shik Park Sang-Chul Shin Information and Communications University Daejeon South Korea National Computerization Agency Seoul South Korea

Each network has its own distinct quality of service (QoS) class. To support end-to-end QoS QoS class interwoking between different network technologies is very important function especially in next generation networks (NGN). QoS mapping between different networks technologies are broadly categorized as mapping between parameters and mapping between classes in each different networks. However, these methods have some problems that the the former is too complicated to implement or the latter may execute uncetrain mapping between networks because of granularity QoS class. So in this paper we present two QoS class mapping methodologies over heterogenous networks to provide end-to-end QoS support for application services. And we propose a QoS class mapping method in different transport techonologies mixed circumstance using Application Service Map (ASM) which classifies application services based on performance requirements. Ths mapping method is based on location information of ASM to determine QoS class according to underlying techonology. The proposed mapping method can easy to accept new coming application services without alternation or modification and it can provide users with the more refined QoS.

关键词： Quality of service next generation networking Diffserv networks Application software Sun Computer networks Telecommunication services Standardization Concatenated codes Delay

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performance Evaluation of Frame Bursting for GbE CSMA/CD SISO networks

Performance Evaluation of Frame Bursting for GbE CSMA/CD SIS...

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The Joint International conference on Optical Internet and next generation Network (COIN-NGNCON)

作者： Wen-Kang Jia Yaw-Chung Chen Department of Computer Science National Chiao Tung University Hsinchu Taiwan

This paper presents traffic analysis of Frame Bursting (FB) in Single-Input Single-Output (SISO) Gigabit Ethernet (GbE) networks. This analysis characterizes the Frame bursting traffic behavior and performance measurement, shows its implications for future research *** Mechanism improves the performance of GbE CSMA/CD networks when transmitting short frames by reducing the Extension Field (EF) overhead, and tries to accord the controversy over the cross-layer (Layer2/Layer3) scheme. We simulate about 1 Tera-packets by random generation, let the packet pass through form non-FB domain to FB domain, observe that FB behavior like the burst per 100 packets (BPHP), packet per burst(PPB) and it's distribution, the burst length in different Input Rate, and Packet Length Distribution Input. We find that there is a linear relationship between Input Rate and the burst behavior. As for the burst behavior is highly dynamic complex in variable Packet Length Distribution types.

关键词： Multiaccess communication Ethernet networks Telecommunication traffic Traffic control performance analysis Road accidents Throughput Protocols next generation networking Computer science

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Routing in autonomic communications

Routing in autonomic communications

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Consumer communications and Networking conference, CCNC IEEE

作者： O. Bazan M. Jaseemuddin Ryerson University Toronto Canada

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Source-initiated Active Rerouting in WDM Mesh networks with Traffic Grooming Capability

Source-initiated Active Rerouting in WDM Mesh Networks with ...

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The Joint International conference on Optical Internet and next generation Network (COIN-NGNCON)

作者： Quang-Dzung Ho Man-Seop Lee Optical Internet Research Center Information and Communications University Daejeon South Korea

In this paper, for the first time, we propose a novel rerouting approach which actively packs existing connections of different bandwidth granularities. Basically different from previously proposed active rerouting that blindly attempts to reroute many existing lightpaths, our algorithm at first estimates the potential resource gain of each existing connection and then reroutes only a small number of candidate connections that may give the largest gains. Therefore, it can efficiently reduce the rerouting costs, i.e., the required overheads and computations, while maximizing the amount of resources that can be conserved for future requests.

关键词： Wavelength division multiplexing WDM networks Mesh networks Telecommunication traffic Optical fiber networks Routing Bandwidth IP networks Costs Lighting control

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