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检索条件"机构=National Digital Switching System Engineering and Techological R and D Center"

共 489 条记录，以下是431-440 订阅

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Scheduling in Fully Buffered Multistage switching Fabric based on round-robin

Scheduling in Fully Buffered Multistage Switching Fabric bas...

引用

IITA International Conference on Control, Automation and systems engineering

作者： Yue Zhang Fang dong Yuxiang Hu College of Information Engineering Zhengzhou University National Digital Switching System Engineering & Technological R&D Center

ISBN: (纸本)9781424445530

Current Memory-Space-Memory Clos switching fabric exhibits poor performance under unbalanced traffic. To eliminate the internal congestion within the switching fabric, by taking buffers into the internal links, this paper proposes an alternative Fully Buffered three-stage Clos switching fabric - FBC, which not only provides perfect throughput performance, but also exhibits better delay performance in heavy load by storing cells at the internal buffers. To employ an efficient and simple scheduling process, we provide a scheduling algorithm for FBC which is named distributed round-robin Scheduling algorithm (drrS). This algorithm takes advantages of high-efficiency of round-robin and is distributed in implementation, which makes the drrS prone to implement in hardware. At last, the simulation results prove that drrS is more effective.

关键词： Fully buffered Clos switching fabric Scheduling algorithm distributed round robin

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A Minimum Cost Active and Backup Path Algorithm with SrLG Constraints

A Minimum Cost Active and Backup Path Algorithm with SRLG Co...

引用

Pacific-Asia Conference on Circuits, Communications and systems, PACCS

作者： Jianhui Zhang Bin Wang Binqiang Wang Jinqiu ren National Digital Switching System Engineering & Technology R&D Center (NDSC) Zhengzhou Henan Province China

As more and more mission critical service are now transported over high-speed networks, it becomes an important issue to make use of the relativity of multiple link/node failures and improve transport performance for high-speed networks. In this paper, we propose a novel algorithm called low cost an S disjoint paths algorithm (LCSd for short) to establish a SrLG disjoint active path and backup path pair for network protection. Based on the TF algorithm, LCSd algorithm introduces the number of links which relate to the SrLG as a new constraint. Through link weight adjustment before the second time SPF calculate, the backup path can avoid the risk sharing with active path. Theoretical analysis and experiment results have shown that LCSd algorithm resolved the trap problem and path pair total cost non-optimal problem under SrLG disjoint constraint. Compared with rF and TF algorithms, LCSd algorithm is significantly superiority in the successful ratio to find feasible solution and can guarantee minimum total cost of active and backup path.

关键词： Costs radio frequency High-speed networks Protection Network topology Mission critical systems Heuristic algorithms Computer networks Circuits switching systems

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ABuGET: Measuring the Non-Cooperative Available Bandwidth

ABuGET: Measuring the Non-Cooperative Available Bandwidth

引用

International Conference on Information Science and engineering (ICISE)

作者： Shuangpeng Tian Jianmin Pang Zheng Shan Peng Liu China National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou Henan China

Although several available bandwidth measurement tools exist, they usually require access at both ends of the measured path. In this paper, we present ABuGET, a single-ended tool for available bandwidth estimation against non-cooperative hosts. Comparing to other single-ended tools based ONE-dELAY mostly. Our measurement tool focus on utilizing ITPr (the improved PTr) algorithm to realize and exploiting TCP protocol options to initiate probing traffic. We describe the design of ABuGET. The comparison of ABuGET to Pathload (the most popular tool measuring the available bandwidth) used in simulation environments showed that our tool can provide better quality of measurements in non-cooperative environments.

关键词： Bandwidth Traffic control Probes delay Protocols Web and internet services Information science switching systems systems engineering and theory research and development

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A LdP fast protection switching scheme for Concurrent multiple failures in MPLS network

A LDP fast protection switching scheme for Concurrent multip...

引用

The First International Conference on Multimedia Information Networking and Security(第一届国际多媒体网络信息安全会议 MINES 2009)

作者： Jianhui Zhang Jia Zhou Jinqiu ren Binqiang Wang National Digital Switching System Engineering & Technology R&D Center (NDSC) Zhengzhou 450002 Henan Province China

In this paper, we provide a non route-calculating MPLS LdP fast protection switching scheme called LdP NrC-FPS scheme which is efficient in transient multi-failures in MPLS networks. This scheme makes full use of various working modes and configurable loop detection of LdP protocol.. When network failures happen, the scheme need not to compute routing again. The scheme uses Path Vector TLV and Hop Count TLV in LdP mapping message to avoid loop in transient multi-failure scenario. Furthermore, OAM mechanism has been introduced into LdP NrC-FPS scheme for accelerating fault recovery process. Compared with traditional fast rerouting strategies in IP and MPLS layer, it reduces the failure recovery time of rerouting and has the advantage of more efficient network resource utilization. Performance analysis shows that LdP NrC-FPS scheme outperforms than traditional IP fast reroute scheme and MPLS protection switching scheme at loop ratio , path unreachable ratio and control message overhead aspects.

关键词： Potection Sitching LdP NrC-FPS Concurrent Mltiple Filures Path Vector TLV Hop Count TLV OAM

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A Synthetic Network Management Model Based on ForCES FE Model

A Synthetic Network Management Model Based on ForCES FE Mode...

引用

IEEE International Symposium on dependable, Autonomic and Secure Computing (dASC)

作者： Fenggen Jia Kangping Liu Bin Zhuge Weiming Wang National Digital Switching System Engineering & Technology R&D Center Zhengzhou China College of Information & Electronic Engineering Zhejiang Gongshang University Hangzhou P.R.China

Forwarding and control element separation (ForCES) architecture network devices can satisfy the requirements of reconstruction for the new generation of the Internet better. This paper proposes a novel synthetic network management model based on ForCES. This model regards the device under management (dUM) as forwarding element (FE) in ForCES architecture and uses FE model to abstract the definition of management function block (MFB), dUM communicates with network management controller using ForCES. This model provides an efficient and flexible method for synthetic network management of diverse dUMs.

关键词： Iron Protocols resource management Force control XML engineering management Taxonomy Middleware Technology management Software development management

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Large Scale Topology discovery for Public IPv6 Networks

Large Scale Topology Discovery for Public IPv6 Networks

引用

7th International Conference on Networking (ICN 2008)

作者： Liu, Zhenshan Luo, Junyong Wang, Qingxian National Digital Switching System Engineering Technological R and D Center China

ISBN: (纸本)9781424442348

Understanding the topology of large scale IPv6 networks is essential to the procurement of good architectural design decisions, particularly with respect to address allocation and distribution schemes. The former distributed topology discovery applications deploy multiple probing hosts throughout the network. This approach relies on the ability to deploy probing hosts throughout the network, which in many cases is not possible. Source routing support in IPv6 routers is a mandated feature and hence mostly enabled. With respect to simple traceroute, source routing allows one to discover paths between arbitrary pairs of network nodes, but it is such difficult to avoid probing redundancy with a null probing stopping set in the initial phrase of discovery. This paper presents two probing systems: VdPS (virtual distributed Probing system) and SrPS (Source routing Probing system). Firstly, VdPS discovers the BTI (Basic Topology Information) of IPv6 networks. Secondly, SrPS selects seeds from the BTI. In the processing of SrPS, it is very effective in avoiding probing redundancy rely on the probing stopping set initiated by the BTI. Finishing the implementation of SrPS, the coverage of probing is increased greatly. We also present some initial results from probing the CErNET2, currently the largest public IPv6 network of China. The results illustrate the effectiveness of coverage and avoiding probing redundancy.

关键词： probing redundancy source routing basic topology information

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Using Queuing Network to Evaluate IXP2400 based VoIP SPS

Using Queuing Network to Evaluate IXP2400 based VoIP SPS

引用

4th International Conference on Networking and Services

作者： Pang, Jianmin Jin, Jiuzhen Zhao, rongcai Shan, Zheng Zhang, Zheng China National Digital Switching System Engineering and Technological R and D Center (NDSC)

ISBN: (纸本)9781424442317

This paper presents the M/G/1 multi-class open queuing networks performance model of IXP2400-based VoIP SPS (signaling parse system). We use UML activity diagrams and function module diagrams to describe this VoIP SYS, and derive the performance model. The resulting model could make statistic analysis of IXP2400-based VoIP SPS with First-Come-First-Seine (FCFS) scheduling policy and mix traffic. We use the approximate calculation of iterative decomposition algorithm to solve this model, and present the formulas of the utilization, delay, etc. The theoretical estimates are in excellent consistence with our testing data, this shows the effectiveness of our performance evaluating method.

关键词： Iterative methods

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The Improved Maximum Urgency First Scheduling Policy

The Improved Maximum Urgency First Scheduling Policy

引用

11th IEEE Singapore International Conference on Communication systems

作者： Zhi, Yingjian Zhao, Bo Wang, Binqiang China National Digital Switching System Engineering and Technology R and D Center China

ISBN: (纸本)9781424424238

Stream merging techniques utilize multicast to minimize the server resource consumption. However, how waiting requests are scheduled for service in the context of stream merging has not been studied extensively. The Improved Maximum Urgency First (IMUF) scheduling algorithm for video servers applying stream merging is proposed. IMUF considers multiple attributes of the video waiting queue. Three heuristic implementation schemes are presented: IMUF-I, IMUF-P and IMUF-M. The proposed implementations are compared and evaluated through extensive simulation. results show that IMUF can yield significant performance benefits in terms of defection rates, average access delay and fairness.

关键词： scheduling urgency optimaization stream merging

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Scalable Media Stream to Heterogenous Users

Scalable Media Stream to Heterogenous Users

引用

11th IEEE Singapore International Conference on Communication systems

作者： Zhi, Yingjian Wang, Na Wang, Binqiang China National Digital Switching System Engineering and Technology R and D Center China

ISBN: (纸本)9781424424238

Many multicast video streaming algorithms have been proposed to provide scalable streaming media services, but they are designed for homogeneous clients, i.e., users are assumed to have the same receiving bandwidth. The performance of these state-of-the-art algorithms will degrade significantly in user heterogeneous environment. A scheme, called the Enhanced Patching, is proposed to support user heterogeneity. Both the optimal threshold window and the average bandwidth are analyzed. A simple but efficient analytical model is also proposed to evaluate the distribution of the capacity demanded by the clients. The numerical results show the feasibility of the proposed scheme.

关键词： streaming media scalable heterogenous enhanced patching

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Queuing network performance model for evaluation of CMP-based VoIP SPS 08

Queuing network performance model for evaluation of CMP-base...

引用

7th IEEE/ACIS International Conference on Computer and Information Science in Conjunction with 2nd IEEE/ACIS International Workshop on e-Activity

作者： Jin, Jiuzhen Pang, Jianmin Shan, Zheng Zhao, rongcai China National Digital Switching System Engineering & Technological R&D Center (NDSC)

ISBN: (纸本)9780769531311

In this paper we describe our experience in performance evaluation of CMP-based VoIP SPS (signaling parse system). We also present a performance model of the system using GI/G/m-FCFS multi-class open QNs(queuing networks). And deal with approximate performance analysis of open non-product-form QNs, based on the method of decomposition. Our approach predicts the major performance evaluation parameters of the system under the workloads and also identifies bottlenecks in the system. Performance results are inserted back into the QN model as initial values associated to the relevant model elements. The theoretical estimates are shown to be in excellent consistence with testing results. It shows the effectiveness of the proposed model. This work explores performance issues of CMP-based applications by means of performance modeling. In this way we may get an immediate feedback on the system performances. The use of QN model allows us to achieve better multi-core application performance.

关键词： CMP

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