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    15 June 2012, Volume 28 Issue 6
    Topic: Car networking technology and Applications
    Mobile Communication Network Applied to Vehicle Communication
    Yi Wang,Jiajia Deng,Yi Lin
    2012, 28(6):  1-6.  doi:10.3969/j.issn.1000-0801.2012.06.001
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    Different communication technologies are used in different cases of vehicle communication. Mobile communication network is a kind of medium and long range communication technology. It has played an important role in V2I. But, for the requirements of current and future vehicle communication, we still need make efforts to improve the ability of mobile communication network which is designed for H2H communication originally. The article discusses three main problems of mobile network for vehicle communication. And it suggests that we may solve those problems by different ways, for example, the application of different kinds of networks, the improvement of software on terminals and platform, the simple optimization of mobile network, and the protocol adaptation of mobile network.

    Analysis of Application Mode and Technology of Interaction Between Vehicle Terminal and Mobile Phone
    Jing Xiong,Jinghua Chen,Meng Zhao
    2012, 28(6):  7-11.  doi:10.3969/j.issn.1000-0801.2012.06.003
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    Based on the analysis of the current situation and some related cases for telematics, this paper indicates that an important development orientation will be the interaction between the vehicle terminal and the intelligent mobile phone. Then it elaborates several main application patterns, specifies the typical technologies and analyzes their characteristics.

    Analysis of Industrial Chain with Telematics and Cooperation Strategy with Telecom Operator
    Jie Wang,Yin Jiang
    2012, 28(6):  11-16.  doi:10.3969/j.issn.1000-0801.2012.06.004
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    This paper introduces the industrial chain of telematics, analyzes the feature and category of this industrial chain, and elaborates the features and advantages of telecom operator. Finally, based on this, it introduces the cooperative strategy in this industrial chain of telecom operator.

    Research of Business Mode and Architecture in Telematics Platform for Passenger Vehicle
    Jie Li,Shenli'e
    2012, 28(6):  17-21.  doi:10.3969/j.issn.1000-0801.2012.06.006
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    This paper introduces the present situation in the passenger vehicle information service industry, and through the analysis of problems in the development we put forward the concept of information service platform. Based on the market situation, we summarize the business mode of the information service platform and elaborate the promoting for the whole TSP development. Finally, we introduce the detailed architecture of the platform.

    Integration of Telematics and Insurance Business
    Yin Jiang,Jie Wang
    2012, 28(6):  22-24.  doi:10.3969/j.issn.1000-0801.2012.06.007
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    This paper introduces the integration of insurance business and telematics, analyzes the characteristics of the insurance telematics industry chain and the situation in China and abroad to explore the new industry opportunities and business strategy from new policies of China insurance regulatory commission.

    Research and development
    A Novel Resolution Service for Internet of Things Based on Physically Topological DHT
    Lu Xiao,Tao Huang,Jiang Liu,Liang Wei
    2012, 28(6):  25-32.  doi:10.3969/j.issn.1000-0801.2012.06.008
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    The name resolution services of the ONS for the internet of things, there are many problems. The improved single/multi-layer DHT resolution system has resolved the load balancing problem of the ONS, but it failed to consider the actual distance of nodes when building a logical network, leading to the return efficiency of the parsed data is reduced. To solve this problem, this paper proposes to establish a novel resolution service for internet of things based on physically topological DHT. It is adopting the design idea of the good combination of DHT logical network and physical network to resolve the vast majority of information locally. It also ensures the much faster return efficient of the parsed data. Reference current status of the internet, we analysis and evaluate the PTDHT-RS. The results show that the whole query and analytical efficiency of this system is superior to the existing single/multi-layer DHT analytical system. From the deployment point of view, PTDHT-RS only use the existing storage technologies and about 1/10 the number of the ONS node to handle about 1015object identities of information. So the PTDHT-RS able to meet the expected demand of the worldwide naming resolution service of the internet of things.

    A Combined Handover Scheme Under CA Mode in LTE-Advanced
    Jihong Zhao,Yang Li,Hua Qu,Hongbao Mao
    2012, 28(6):  33-41.  doi:10.3969/j.issn.1000-0801.2012.06.010
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    On the progress of researching for key technology and standard of LTE-Advanced, enhanced mobility control and carrier aggregation(CA)are kept to be researching points. Injection of CA brings new challenge to handover procedure for one thing, for another it could be used to support handover mechanism to overcome outage probability of user plane from handover of R10. In this paper we propose a handover scheme under CA mode called combined handover scheme,which makes use of data supporting from secondary cell(SCell)during handover execution to overcome outage probability of handover in R10. We make supplement to handover procedure of R10 in order to accommodate the proposed scheme.

    Research on IPv4/IPv6 Forwarding Control Architecture in Distributed Router
    Zongfeng Sun,Zhihui Xiao,Jian Sun
    2012, 28(6):  42-47.  doi:10.3969/j.issn.1000-0801.2012.06.012
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    With the rapid development of internet, both new applications and internet traffic have increased very quickly, internet with IPv4 already can't meet people's requirement about its performance and function. Compared with IPv4, IPv6 has many advantages, such as a huge amount of address resource, reliable security, and high routing efficiency, moreover address resource of IPv4 already dried up, so IPv6 will finally replace IPv4. In the transition time from IPv4 to IPv6, many transition techniques are put forward and applied, such as dual-stack technique, tunnel technique and so on. The transition process from IPv4 to IPv6 will need a long time, so internet with IPv4 and IPv6 will coexist during the transition time. Meanwhile, the rapid development of internet puts high requirement to performance and function of router,distributed router based on the idea of forwarding and control element separation can improve router's performance greatly and perform wire-rate processing for IP packets, which well meets the requirement of rapid development internet. Therefore, doing research in IPv4/IPv6 forwarding control architecture of distributed router is very significant to improve the performance of core router and promote the development of IPv6.

    System Modeling and Performance Analysis of Sleep Mechanism in IEEE 802.16m Based on the Multiple-Vacation Queue
    Shunfu Jin,Honglei Song
    2012, 28(6):  48-53.  doi:10.3969/j.issn.1000-0801.2012.06.014
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    In a mobile broadband wireless metropolitan area network, how to reduce the energy consumption of the station battery and extend the life of the mobile network has become the research focus in the related field. For the sleep mechanism in IEEE 802.16m, the packets can be transmitted during the listening window, and the listening window can be expanded as needed. Regarding the listening window with packet transmission as a busy period, and the listening window without packet transmission together with the subsequent sleep window is seen as a vacation period, then a queueing model with multiple-vacation is built. The first vacation length is supposed to follow a PH distribution, the subsequent vacations are assumed to increase binary-exponentially. Applying the method of matrix geometric, the queueing system is analyzed in steady-state, the formulas for the energy saving ratio and the average delay of packets are given, moreover, a cost function is constructed by combining different performance measures. With simulation results, the initial phase for the first vacation length is given. Numerical results are provided to investigate the system performance and optimize the system parameter.

    Research of Packet Capture Technology in IPv6 High Speed Network Environment
    Xianglin Wang,Qingzi Shen,Chen Zhu,Lipeng Liu
    2012, 28(6):  54-62.  doi:10.3969/j.issn.1000-0801.2012.06.015
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    This paper designs a high speed packets capture platform(HSPCP)for IPv6 high speed environment using the idea of zero copy. It is mainly aimed at solving the serious packets dropping problems in tradition packets capture technology. The platform is based on Intel82541GI's gigabit ethernet driver e1000 to improve the network packets reception process. Through registered a miscellaneous equipment in kernel,it achieves mmap and ioctl methods and we rewrite a user space packets capture program according to the improved zero copy driver. The experiments show that HSPCP in packet capture rate, CPU utilization, the system context switch times have significantly improved than the libpcap capture manner.

    Modulation Recognition for GLSFBC-OFDM Signals
    Jinlong Zhan,Yongming Guo,Jianjun Lu
    2012, 28(6):  63-67.  doi:10.3969/j.issn.1000-0801.2012.06.016
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    A novel recognition algorithm is proposed over frequency selective fading channels to distinguish multi-carrier (OFDM)and single carrier(MFSK、MPSK、MQAM)signals of GLSFBC structure.The proposed algorithm is based on high-order cumulants, only needs to directly process the received IF signals, and doesn't need to know the piror information of transmit signal and channel. Simulation results show that 90% correct classification rate could be reached when SNR is above 7 dB.

    Study on Load Balancing of KAD Network
    Jiantao Shi,Hongli Zhang
    2012, 28(6):  68-72.  doi:10.3969/j.issn.1000-0801.2012.06.017
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    Due to the specificity of the application environment and the heterogeneity of the nodes in the system, most DHT networks have the problem of load imbalance. This paper focuses on the KAD network of eMule which is a popular DHT system on the internet. Through measurement study, we find that a large fraction of references to popular key words are lost due to peer saturation. It greatly impacts normal resources publishing and retrieving. This paper proposes an adaptive load balancing mechanism,which is using multiple target ID to make more peers responsible to store popular references.It solves problems related to saturated peer and makes an efficient usage of peer resources. Simulation result shows that our modification is effective.

    A Method for Implementation of TD-LTE Terminal's PLMN Search
    Qiong Wang,Chuanshuai Qu
    2012, 28(6):  73-81.  doi:10.3969/j.issn.1000-0801.2012.06.018
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    This paper starts with the holistic frame of the TD-LTE terminal's protocol stack. Firstly, the feature of PLMN search is summarized, and the modules and interfaces are designed to deal with the feature of PLMN search. Then, it focuses on the principle and realization of GAP PLMN search. Finally, processes of typical PLMN search scenes are designed, and SDL and TTCN co-simulation software is used to test and verify the feasibility and effectiveness of GAP PLMN search.

    Calibration of Conducted Immunity on DC Power Port
    Ke Zhang,Wenjian Wang,Yu Guo
    2012, 28(6):  81-85.  doi:10.3969/j.issn.1000-0801.2012.06.019
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    The paper introduces the test configuration of conducted immunity on DC power port. And it makes an analysis of technical parameters on the attachment concerned in the calibration, especially makes an interpretation of common impedance of CDN and the insert loss of 150~50 Ω adaptor.

    Research and Development of the Monitoring Technology of GTPv2 in LTE Network Monitor
    Fang Cheng,Li Yang,Jian Huang,Wei Pu
    2012, 28(6):  85-91.  doi:10.3969/j.issn.1000-0801.2012.06.021
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    In basis of the functional requirements of the LTE tester, the paper proposed and designed a software platform research program of LTE network tester. Combined with analysis of GTPv2 protocol, the thesis use modular method and IE list traversal algorithms for message decoding, introduce a Hash structure indexed by the key field for GTPv2 message synthesis, use a mathematical model that combine with message identifier and offset for identify of the upper packet, solve the key challenges that difficult to transmit information in decoding module, module coupling and low efficiency of CDR synthetic. Finally, the practical commercial test shows that the mentioned program in this thesis are effective.

    Improvement on Design of Microstrip Patch Log-Periodic Antenna
    Zhen Yu,Jianghua Wang,Xiaoying Ran
    2012, 28(6):  92-97.  doi:10.3969/j.issn.1000-0801.2012.06.023
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    Based on the principles and the structure characteristics of traditional log-periodic dipole antenna, combined with the advantages of microstrip antenna, this paper improves the design of a wedge-angle microstrip patch log-periodic monopole antenna with 16 units working from 1.2 GHz to 3.2 GHz. It proposes an antenna interactive calculator with VB software to calculate and adjust antenna parameters conveniently. Then, to construct, simulate and optimize the antenna model with Ansoft HFSS software. The antenna is tested by PNA3621 vector network analyzer. Measurement results show that the antenna has good characteristics with symmetrical radiation pattern, broad bandwidth, little number of side lobes, the voltage standing wave ratio, which agree well with the simulation results.

    An Approach of Active Indoor Positioning Using Smartphone for Mobile LBS
    Lu Lou
    2012, 28(6):  98-103.  doi:10.3969/j.issn.1000-0801.2012.06.025
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    Along with the technical progress of the wireless mobile internet, location-based services(LBS)have been developing more rapidly, and the popularity of the smartphone also bring more convenient to access to LBS services for mobile customers. But the mobile position solutions, especially indoor positioning, are still difficult and have become the technical bottleneck. To address the problem of indoor positioning, this paper presents an approach of active indoor positioning that use image feature recognition and motion detection to complete the accurate positioning of the indoor environment based on smartphones built-in sensors only, with the technology advantages of low cost, practicable and flexible frame.

    Application of Position Tracking Based on Fringes of DTV-GPS Positioning
    Anhong Tian,Youjun Ren,Chengbiao Fu
    2012, 28(6):  104-108.  doi:10.3969/j.issn.1000-0801.2012.06.026
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    In allusion to the accuracy problem of the fringes positioning where GPS satellites are blocked, this paper uses the positioning technology of DTV-GPS to obtain the location of the target, firstly. Then, this paper assumes a maneuver target model of U-shaped mountain road, and the Kalman filter algorithm is used to track positioning target, finally, the Monte-Carlo method is adopted to carry out the simulate research. The simulation results show that the estimate trajectory is close to the real trajectory, and the error about 10 m, in line with the standards of the positioning accuracy, also the model is in line with the actual scene. The algorithm is to use and stable and has rapid convergence rate and high positioning accuracy to improve the accuracy of the mobile target tracking and real-time system.

    Overview
    Research on the Development of Next Generation Satellite Network
    Tengyue Mao,Zhengquan Xu,Rongbo Zhu,Rui Hou
    2012, 28(6):  109-113.  doi:10.3969/j.issn.1000-0801.2012.06.028
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    The satellite network has being developed to today, its techniques have being developed maturely, international standards have being gradually developed, and markets also have being boomed. But the limitations in recent satellite networks, which are high-latency pipe structure, non-standard satellite IP function, lack of compatibility and expansibility, and so on, block the rapid development of them comparing with the ground Internet. Only when next generation satellite networks utilize mature IP technology to build IP satellite network and seamlessly connect with internet on the earth, we can break through the developmental bottleneck of satellite network and meet cheap and convenient service of the users. Based on summarizing limitations of the present satellite network, we have explored the necessity, structure and advantages of next generation satellite network, and have elaborated challenges and opportunities faced by next generation satellite network.

    Shanghai Telecom "city optical network construction
    Research & Application of the Dynamic Authorization in the Metro Optical Network
    Jianping Zhang,Zhonghua Chen
    2012, 28(6):  119-124.  doi:10.3969/j.issn.1000-0801.2012.06.032
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    This article analyzes the principle of the dynamic authorization of the user access speed in carrier network.It provides a method to realize the dynamic authorization service. In the end, this article also gives a prosepct not only on the new valued service mode but also on the development of the technology in the future.

    Operational Innovation Forum
    Cost Management Model for Information System
    Chao Zhang
    2012, 28(6):  141-145.  doi:10.3969/j.issn.1000-0801.2012.06.035
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    The cost of IT systems is greatly reduced due to slowdown of global economic. The traditional cost control method cannot coordinate the relationships between cost and performance, reduce internal risks of controlling cost, or cost compression in a long time period. This paper provides a new IT cost management model which can coordinate cost, performance and risk, resulting in a continuous cost cut down.

    Research on User Tracing Solution in the Background of IPv6 MAN
    Ye Cheng,Jie Wang,Lei Xie
    2012, 28(6):  146-150.  doi:10.3969/j.issn.1000-0801.2012.06.037
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    With the announcement of China's next-generation internet development policy, the ISP will starting to do small-scale commercial tests on IPv6 in some cities. This article will focus on user tracing solution in the background of IPv6 MAN, tries to provide deployment recommendations on IPv6 user tracing system with the regulatory authorities and operators' requirements of traceability.

    Study of Coverage Prediction Model for Dense Urban
    Hui Huang,Xiuping Yang,Xiumin Yang,Xiaochun Qing
    2012, 28(6):  151-160.  doi:10.3969/j.issn.1000-0801.2012.06.038
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    This article selects statistical model(such as Okumura-Hata model)and deterministic model(such as 3D ray-tracing model)to study the differences of two models in the dense urban area. Then it briefly proposes the application of coverage prediction model for dense urban based practice.

Copyright Information
Authorized by: China Association for Science and Technology
Sponsored by: China Institute of Communications
Posts and Telecom Press Co., Ltd.
Publisher: Beijing Xintong Media Co., Ltd.
Editor-in-Chief: Chen Shanzhi
Editorial Director: Li Caishan
Address: F2, Beiyang Chenguang Building, Shunbatiao No.1 Courtyard, Fengtai District, Beijing, China
Postal Code: 100079
Tel: 010-53879277
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E-mail: dxkx@ptpress.com.cn
Mailing Code: 2-397
ISSN 1000-0801
CN 11-2103/TN
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