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Providing personalized converged services based on flexible network reconfiguration

Science China(Information Sciences) 2011年第2期54卷 334-347页

作者： HU YuXiang, LAN Julong & WU JiangXing national {2. Switching system engineering and technological research center, zhengzhou 450002. China 1. national digital Switching {2. engineering and technological research center Zhengzhou 450002 China

Recent developments show a progressing convergence of networks, services, and applications, which results in the necessity for new approaches to provide a ubiquitous experience on converged networks for specialized high data-rate services. A fundamental diversifying attribute for the future physical network convergence paradigm is pressing. In this paper, we make researches on converged resource reconfiguration model of substrate physical network based on hardware virtualization and provide a service oriented network architecture as a network convergence primitive. Based on the idea of hardware virtualization which is performed by platform deformation and component processing with reconfiguration (here, they are realized as reconfigurable routers (RR)), the substrate converged network, which inter-connects various access networks by reconfigurable routers, could be mapped into multiplex service oriented logical networks, supports dynamic reconfiguration due to diversified quality of services under heterogeneous environment, and therefore provides more flexible and high- speed multiple services. In addition, to demonstrate the generality of our model, we provide a prototype of reconfigurable router. The design, implementation and task scheduling as well as both hardware and software reconfiguration process of reconfigurable router are discussed in detail. Our evaluation shows that reconfigurable router is transparent for upper service-providing networks and results in little performance impact on the service delivery when both hardware and software reconfiguration are used.

关键词： network convergence hardware virtualization resource reconfiguration reconfigurable router

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Single station location method in NLOS environment: The circle fitting algorithm

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Science China(Information Sciences) 2011年第2期54卷 381-385页

作者： YANG TianChi & JIN Liang China national digital Switching {2. engineering and technological research center, zhengzhou 450002. China 1. China national digital Switching {2. engineering and technological research center Zhengzhou 450002 China

This paper proposes an algorithm, called circle fitting algorithm, for locating targets by using maneuverable single station in non-line-of-sight environment. This algorithm estimates the position and scattering distance of all scatters based on the circular motion character. The pseudo-target trajectory is calculated from observation results from different observation positions. With scatters regarded as virtual observation stations, the problem of single station location can be converted into a problem of multi-station location. Finally, the traditional multi-station location algorithm is used to estimate target position. Simulation results prove that the proposed method is effective.

关键词： single station location circle fitting algorithm non-line-of-sight (NLOS) propagation scatter TOA AOA

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An immune-theory-based model for monitoring inter-domain routing system

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Science China(Information Sciences) 2012年第10期55卷 2358-2368页

作者： GUO Yi & WANG ZhenXing national digital Switching {2. engineering & technological R&D center,zhengzhou 450002.China 1. national digital Switching {2. engineering & technological R & D center Zhengzhou 450002 China

The inter-domain routing system faces many serious security threats because the border gateway protocol(BGP) lacks effective security ***,there is no solution that satisfies the requirements of a real *** address this problem,we propose a new model based on immune theory to monitor the inter-domain routing *** introduce the dynamic evolution models for the "self" and detection cells,and construct washout and update mechanisms for the memory detection ***,borrowing an idea from immune network theory,we present a new coordinative method to identify anomalous nodes in the inter-domain routing *** this way,the more nodes working with their own information that join the coordinative network,the greater is the ability of the system to identify anomalous nodes through evaluation between *** it is not necessary to modify the BGP,the ITMM is easy to deploy and inexpensive to *** experimental results confirm the method’s ability to detect abnormal routes and identify anomalous nodes in the inter-domain routing system.

关键词： border gateway protocol inter-domain route immune theory anomalous node coordinative identification

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A single observer location method under the scatter signals position disturbance situation:the constraint total least square method

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Science China(Information Sciences) 2011年第1期54卷 146-152页

作者： YANG TianChi1,YU ChaoQun2.WANG TianPeng1 & JIN Liang1 1national {2. Switching system engineering and technological research center, zhengzhou 450002.China 2.urveying and Mapping College of Information engineering University, zhengzhou 450002.China 1. national digital Switching {2. engineering and technological research center Zhengzhou 450002 China2. Surveying and Mapping College of Information Engineering University Zhengzhou 450002 China

A target position can be estimated using position information from scattered signals in the nonline-of-sight propagation environment in a single observer location *** is always an error in the final estimated result of the position obtained using scatter signals because measurement noise is *** reduce the total error of the system,we propose a method of converting the problem of optimizing location into a one of solving the extremes of the *** the problem of how to solve the extremes of the constraints is converted into an unconstrained problem by using the constrained total least squares(CTLS) ***,the Newton iteration method is used to obtain the optimized *** results also verify the capability of this method.

关键词： scatter position disturbing VOCTLS single observer location Newton iteration

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Achieving fair service with a hybrid scheduling scheme for CICQ switches

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Science China(Information Sciences) 2012年第3期55卷 689-700页

作者： HU HongChao , GUO yunFei, YI Peng & LAN Ju{2. Department of Broadband Information Networks, national digital Switching system engineering & technological R&D center (NDSC), zhengzhou 450002. China 1. Department of Broadband Information Networks National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou 450002 China

Providing performance guarantees for arriving traffic flows has become an important measure for today’s routing and switching systems. However, none of current scheduling algorithms built on CICQ (combined input and cross-point buffered) switches can provide flow level performance guarantees. Aiming at meeting this requirement, the feasibility of implementing flow level scheduling is discussed thoroughly. Then, based on the discussion, it comes up with a hybrid and stratified fair scheduling (HSFS) scheme, which is hierarchical and hybrid, for CICQ switches. With HSFS, each input port and output port can schedule variable length packets independently with a complexity of O(1). Theoretical analysis show that HSFS can provide delay bound, service rate and fair performance guarantees without speedup. Finally, we implement HSFS in SPES (switch performance evaluation system) to verify the analytical results.

关键词： switching fabric scheduling policy load balancing dynamical re-routing

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Achieve load balancing with a dynamic re-routing CICQ switching scheme

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Science China(Information Sciences) 2012年第2期55卷 407-418页

作者： HU HongChao,GUO yunFei,YI Peng & LAN Ju{2. Department of Broadband Information Networks,national digital Switching system engineering & technological R&D center(NDSC),zhengzhou 450002.China 1. Department of Broadband Information Networks National Digital Switching System Engineering & Technological R&D Center (NDSC) Zhengzhou 450002 China

Multi-path based routing and switching can achieve network-wide load balancing and reduce the port conflicts of switching *** by this novel idea,in this paper,through analyzing the feasibility of implementing multi-next-hops in core switching networks comprehensively,we advance a switching scheme called MHRS(multi-next-hop re-routing switch)and a forwarding table management scheme called HMFT(hierarchical multi-stage forwarding table)to support multi-next-hop dynamical *** implements dynamical re-routing in the switches according its congestion status to achieve real-time load balancing,while HMFT can provide traffic with different forwarding paths based on their QoS *** analysis and simulation results show that switches equipped with HMFT and MHRS can provide good delay and throughput ***,they can reduce port conflicts significantly.

关键词： switching fabric scheduling policy load balancing dynamical re-routing

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Dynamic Binary Instrumentation Technology Overview

Dynamic Binary Instrumentation Technology Overview

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2.12.national Conference on Information Technology and Computer Science

作者： Kunping Du national digital Switching {2. engineering & technological research center zhengzhou,China Fei Kang national digital Switching {2. engineering & technological research center zhengzhou,China Hui Shu national digital Switching {2. engineering & technological research center zhengzhou,China Li Dai national digital Switching {2. engineering & technological research center zhengzhou,China

The Dynamic Binary Analysis technology is a newly emerged technology which can analysis program execution *** this technology,the process of program analysis became more simple and *** researchers had put forward several Dynamic Binary Analysis Platform in recent 10 *** on these platforms,users can easily build useful analysis tools which satisfy their own *** paper introduces five most representative Dynamic Binary Analysis platforms ***,four significant fields and existing applications closely related with Dynamic Binary Analysis technology are *** the end of this paper,the feature research hot spots are discussed.

关键词： Dynamic Binary Analysis program analysis technology Dynamic Binary Instrument

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A New Method of Loop Performance Analysis

A New Method of Loop Performance Analysis

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2.11 IEEE International Conference on Computer Science and Automation engineering(CSAE 2.11)

作者： hao yun-{2. national digital Switching system engineering & technological research center zhengzhou China Zhao Rong-cai HAN Lin ZHU Jia-feng

＜正＞It is difficult to complete the accurate analysis of loop performance using current *** method uses the idea of feedback optimization,combined with some static analysis method,without the support of hardware *** result manifest that the method can complete accurate loop-level performance analysis,help the programmers finding the hot-spot and analyzing the program.

关键词： feedback-directed compiling loop-level spot program analysis open64

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WCDMA-FDD方式下信道化码的分配规则及算法

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计算机工程 2002年第1期28卷 80-82页

作者：郭淑明何红永郭云飞国家数字交换系统工程技术研究中心郑州450002

介绍了信道化码(Channelization Code)及其重要作用,分析了它在W-CDMA(Wideband CDMA)系统FDD(Frequency Division Duplex)方式下的分配规则及策略;提出了一种实用的实际算法。

关键词：第三代移动通信信道化码码分配规则算法宽带码分多址 WCDMA-FDD

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DESIGN AND EVALUATION OF A PIPELINED FORWARDING ENGINE

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Journal of Electronics(China) 2007年第2期24卷 157-162页

作者： Li Yufeng Chen Yue Lan Julong national digital Switching {2. engineering ＆ technological R ＆D center Zhengzhou 450002 China

Recent advances in broadband technology have caused forwarding engines to handle pack- ets with over 10 gigabit per second. In this paper, we present a high-speed forwarding pipeline which can finish all of the routing and forwarding tasks in the way of pipelining. We also establish the analysis model of the pipeline with which one can evaluate some key performance parameters of the forwarding engine such as forwarding rate and forwarding delay. We find that the pipeline is of good scalability and can forward unicast packets up to the speed of 40Gbit/s.

关键词： Design Forwarding engine Pipeline Evaluate

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