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15 March 2009, Volume 25 Issue 3

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Applications of PTN in 3G Transport Network

Hu Wei,Zhang Jiexin and Ma Yulu

2009, 25(3):  1-4. 

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Proceeding from the technology characteristics of PTN, this paper analyzed the demands on 3G transport network, and proposed some suggestions about the application mode of PTN in 3G transport network.

Optical communication high level Forum

Applications of PTN in 3G Transport Network

Wei Hu,Jiexin Zhang,Yulu Ma

2009, 25(3):  1-4.  doi:10.3969/j.issn.1000-0801.2009.03.001

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Proceeding from the technology characteristics of PTN，this paper analyzed the demands on 3G transport network，and proposed some suggestions about the application mode of PTN in 3G transport network.

Research on Home Base Station Security Mechanism

Zheng Zhibin,Wu Hao and Chen Jing

2009, 25(3):  6-10. 

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With widely application of wireless broadband, home base station, as a mini-size base station deployed in user’s home, is used to solve the access problem of wireless data in the last 10 m. Since the deploy environment of home base station is much different from that of macro-base station, home base station requires complex security mechanism to ensure the security. Based on this, this article introduces and analyzes the security key technologies of home base station.

Topics: IPTV technology and Applications

Technical Implementation of IPTV and Multi-field Message Service

Xiaoping Wang,Xiaoyu Zhang,Min Ge

2009, 25(3):  7-12.  doi:10.3969/j.issn.1000-0801.2009.03.004

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Message service，as a kind of value-added service of IPTV，has realized the messages transportation between application and user and between user and user. First，the application scene of IPTV message service is analyzed. Next the structure of message system and the service flow of message service are introduced. Then the technical implementation of interface protocols，function requirements and etc. are discussed thoroughly. Finally，the trend that IPTV message service develops to multi-field message service is discussed.

Study on the Strategy and Technology of Home NodeB Location Restriction

Zhang Lingfeng,Jiang Xin and Rui Heling

2009, 25(3):  11-15. 

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Home NodeB, also known as Femtocell, is an indoor telecommunication equipment which integrates the main functions of the traditional UTRAN equipment. In this article, firstly, discuss the development and trend of the Femtocell； secondly, analysis the necessity and feasibility for the location restriction of Femtocell； thirdly, introduce the typical location restriction method which is based on the interception of macro NodeB； lastly, from the view of network address binding, introduce two new methods for the location distriction of Femtocell.

Study on IPTV DRM Technical and Standard

Kun Yang,Kai Wei

2009, 25(3):  13-16.  doi:10.3969/j.issn.1000-0801.2009.03.006

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IPTV provides service and content which backing the serves for the user. In order to prevent the content’s abuse，it is very necessary to establish the DRM system. On the basis of analyzing domestic IPTV service requirement，we describe the IPTV DRM framework，and introduce standard research progress and the mentality.

Analysis of Home NodeB’s Authentication

Wang Xiaoming,Du Yanyan and Jiang Xin

2009, 25(3):  16-19. 

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As a new type of base station, Femto home NodeB（HNB） is both a family equipment and a network equipment. This article gives solutions of Femto user authentication，Femto HNB equipment authentication and mobile UE authentication.

Study of Triple Screen Interactive and Converaged Services Based IPTV

Li Jiang,Weijia Shi

2009, 25(3):  17-21.  doi:10.3969/j.issn.1000-0801.2009.03.007

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The background of this paper is that the new challenge and chance comes up to service carriers in all-service operation environment. The overseas all-service carriers’ new strategy to develop IPTV and the users’ new requirement for triple screen interactive is analyzed at first. And the concept of triple screen interactive and its service functionalities is introduced in details which could be deployed based on IPTV.At last，the technical implementation is discussed to develop triple screen interactive and converged services based IPTV.

Research on QoS Management of Differentiating Femto AP

Shi Wencan and Ouyang Qi

2009, 25(3):  20-24. 

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In this paper, a new QoS management method for differentiating Femto AP is proposed. According to the new method, Femto gateway is used as a center point of the wireless QoS management, the current session is associated with the served Femto AP in real-time. The method help operator to control the Femto system more effectively and constitute the market policy more flexibly.

Study and Application of IPTV Terminal Middleware

Jianting Meng,Xin Shen

2009, 25(3):  22-26.  doi:10.3969/j.issn.1000-0801.2009.03.009

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How to take the advantages of IPTV terminal middleware in service deploying is a recognized problem in IPTV industry. In this paper，a new IPTV terminal middleware architecture is introduced which has a good performance in service expansibility and terminal platform migration. Furthermore，it is introduced the method and procedure of implementation and push of client/server application based on the IPTV terminal middleware. At last，the advantage and future development of IPTV terminal middleware is discussed with a conclusion.

Study on Synchronization Solution for TD-SCDMA Home NodeB

Jiang Xin,Rui Heling and Du Yanyan

2009, 25(3):  25-28. 

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This article first introduced the home NodeB’s background and the overview of system solution, and then analysed clock synchronization solutions in TD-SCDMA home NodeB’s deployment, gave the mainstream solutions with analysis of strengths and weaknesses, and finally put forward different proposals of the actual deployment.

ITMS Based IPTV Terminal Management Technology

Xin Shen,Jianting Meng

2009, 25(3):  27-31.  doi:10.3969/j.issn.1000-0801.2009.03.010

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In this article，TR069 based ITMS is introduced into IPTV system to handle IPTV STB and meets the needs of the unique requirement of IPTV services. With more detailed description about ITMS，an integrated user-end terminal management system is shown here as a reference for the network operators.

Research on Convergent Service of FemtoCell

Shi Fangyan,Diao Yanrong and Liu Xu

2009, 25(3):  29-32. 

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FemtoCell can not only resolve the wireless coverage of blind spots but also be used to provide convergent services. This paper describes the AP convergent solution based on the FemtoCell and DSL/Wi-Fi/IPTV, programs of bundled fees, composite business service, enterprise application, and so on.

Research on Key Factors Effecting IPTV Service Quality and Service Improvement Measures

Liang Yao

2009, 25(3):  32-35.  doi:10.3969/j.issn.1000-0801.2009.03.012

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In this paper，a monitoring method is proposed for IPTV service quality，based on the user experience.The real network monitoring results are analysed in order to confirm the key factors which effect IPTV service quality. Then，solutions are proposed to improve IPTV service quality，as well as requirements of IPTV platform and intermedia network devices.

Analysis of FemtoCell Network Test Based on cdma2000 System

Wang Siwei,Liu Yuan,Dong Bin and Zhou Feng

2009, 25(3):  32-38. 

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With the rapid growth of mobile communications business, quality of network and coverage of blind spots have become the key factors in holding users. As a rapid supplementary means of coverage, FemtoCell has good application prospects in solving the coverage of blind spots in family, enterprise and developing convergent services. This paper describes the network of FemtoCell based on cdma2000, the testing process and test results. Then it analyses some key technical problems such as synchronization, handoff, interference, QoS and gives out the advice of solutions. The technical feasibility of FemtoCell is verified through the actual network tests.

Study of IPTV Soft STB

Liding Jia,Hao Wu

2009, 25(3):  36-40.  doi:10.3969/j.issn.1000-0801.2009.03.013

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Based on the problems about increasing STB cost and the unclear direction of IPTV service development，the business advocacy and promotion of cost reduction of the IPTV soft STB is analyzed in this paper. Furthermore，it focused on the technical implementation and service functionalities of IPTV soft STB，and finally discussed the service scenarios of soft STB and compared it with the existing Internet video streaming service on the business model aspect.

Research on Topologic Architecture of Three-Dimensional Network on Chip

Chen Yiou,Hu Jianhao and Ling Xiang

2009, 25(3):  39-44. 

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The three-dimensional network on chip is a new technology in VLSI, in order to solve the communication challenges of system on chip caused by high integration. The state of the art topologies and relative techniques for 3D NoC are introduced in this area, three novel 3D topologies based on De Bruijn graph are proposed, and the performance parameters of these topologies are compared.

research and development

P2P-based Conference Model for Multimedia Network

Liang Zhou,Shifeng Chen,Xiaopeng Lin,Donghui Guo

2009, 25(3):  44-48.  doi:10.3969/j.issn.1000-0801.2009.03.015

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This paper proposed a conference model based on P2P technology，which adopted Chord protocol to distribute the server function to many nodes in the network. Meanwhile，the system divided nodes into two parts：super nodes and ordinary nodes according to their ability，so as to take advantage of their abilities and eliminate the problem of server bottleneck in C/S structure. Simulation proved the advantage of load balancing，tolerance of fault and high scalability.

A Novel Trustworthy Routing Architecture Based on Intelligent Traffic Classification

Li Jun,Zhang Shunyi,Li Cuilian and Xuan Ye

2009, 25(3):  45-51. 

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Trustworthy networks will be an important trend of the research on network security and quality of service (QoS) provisioning. In this paper, we firstly present QoS routing model based on traffic classification to support the deployment of trustworthy networks. It consists of the components such as dynamic configuration of security/QoS policies, accurate traffic classification in real-time, packet marking, automatic traffic regulation and control, queue scheduling mechanism, and QoS routing. Thereof, elaborate scheme of intelligent traffic classification is investigated and proposed to facilitate the model. The traffic classification system is characterized as high accuracy, low computational complexity, scalability, early detection, and robustness by leveraging the advantages of various classification approaches. It is, therefore, expected to be used in the context of real-time traffic classification.

Research on the Interoperability of Mobile DRM System

Pei Yang,Baoxian Zhang

2009, 25(3):  49-53.  doi:10.3969/j.issn.1000-0801.2009.03.016

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Interoperability is an important criterion to evaluate the performance of a DRM system. This paper first review related technologies for interoperability of DRM systems. Then by considering the characteristics of mobile applications present the design of an interoperable DRM system model.Detailed design description of each component of the system is also given.

Research on IMS Network QoS Based on MPLS Bearer Architecture

Zhao Gang,Zhang Xiangqi and Zhang Le

2009, 25(3):  52-56. 

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In this paper, the IMS network QoS control policy proposed in 3GPP R7 is reviewed. Based on that, practical solutions are given to ensure an end-to-end QoS, applied in both IMS core and bearer networks.

Research on Labeling Strategy for LDPC Coded BICM-ID Systems

Ping Huang,Yi Jin,Chunming Zhao

2009, 25(3):  54-58.  doi:10.3969/j.issn.1000-0801.2009.03.017

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We investigate the effect of the different labeling map on the LDPC-BICM-ID system performance based on the extrinsic information transfer（EXIT）chart and computer simulation. The results show that Gray mapping is the best compared with the other optimized labeling strategies designed especially for the convolutional codes coded BICM-ID systems.

Design and Simulation of a Multicast Communications Model for NoC

Ouyang Yiming,Zhu Bing,Liang Huaguo and Wang Wei

2009, 25(3):  56-61. 

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A model of multicast communications is proposed for NoC (networks on chip) to provide communications to guarantee deadlock-free routing. Multicast model has the capability of reducing traffic remarkably, increasing utilization ratio of channels and decreasing testing time in test mode. Modeling of the multicast communications were simulated and applied on 2D Torus NoC. Experimental results demonstrate that our communications model has lower average communication latency and higher throughput than unicast communications.

Study of Ultra-wideband for Multi-access System Based on Multi-chirp Waveform

Jin Zhou,Qida Zhao

2009, 25(3):  59-63.  doi:10.3969/j.issn.1000-0801.2009.03.018

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UWB based on chirp waveform has the advantages of low cost，low power consumption and high processing gain. A UWB system based on multi-chirp waveform is employed to construct a multi-user UWB system，which enables the system gain merits of both IR-UWB as well as OFDM-UWB. System performance for multi-user UWB using multi-chirp waveform is theoretically analyzed with details. Simulation results are given to show that such a system outdoes traditional UWB in the aspect of mitigating multi-user interference.

Design of the Firmware for Stackable VoIP Card

Li Fenghua,Zhang Ce,Wang Zhongmin and Li Yi

2009, 25(3):  62-67. 

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The architecture of a stackable VoIP telecommunication application system is proposed; and the firmware implementation of the VoIP card based on the IP stackable-oriented attribute is described emphatically. A VoIP card can support 8 voice channels, and the cards can be independently connected with each other through IP by the self-defined communication protocol，the stackable attribute based on IP is realized. This protocol is used to implement the communications among the channels within the voice-chip, among voice-chips within the card, among different VoIP cards, between the VoIP cards and the management PC. To improve the real-time capability, the control software of the VoIP card is running under the kernel module model, and the call-back function is triggered by the interruption service routines of VINETIC-2CPE voice-chip under the kernel module model.

Study on Spectrum Sensing Algorithms of Physical Layer in Cognitive Radio Network

Ziqi Liu,Chunyan， Feng,Zhimin Zeng,Caili Guo

2009, 25(3):  64-69.  doi:10.3969/j.issn.1000-0801.2009.03.019

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Spectrum sensing is one of critical techniques in cognitive radio network. In this paper，spectrum sensing algorithms of physical layer are studied. Above all，the sensing performance and the complexity of the classical spectrum sensing algorithms are described in the scenario of CRN application. Then，a series of improved algorithms and some novel algorithms based on the difference between the correlation of the target signal and the noise are proposed，in order to overcome the drawbacks of the classical spectrum sensing algorithms. Furthermore，classification and comparison for these algorithms are developed consequently. In addition，the CRN sensing scheme is presented，which combines the advantages of different algorithms. Finally，some prospects on this subject are given at the end of this paper.

A Scheduling Algorithm for WiMAX Mesh Network with Multiple Egress

Huang Zhaowen,Feng Suili,Ye Wu and Zhuang Hongcheng

2009, 25(3):  68-73. 

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When we use the wireless mesh network in backhaul network, we need to consider the scheduling efficiency, throughput and robust. Since the WiMAX mesh network can guarantee the QoS of the mesh network, it is possible to be deployed in the backhaul network. In this paper, we analyze the scheduling mechanism of the WiMAX mesh network and point out the shortcoming of the single BS. Then we proposed a new WiMAX mesh network topology with multiple BS as egress, and we also gave the global optimized scheduling algorithm for our network plan. We described the detailed procedure used in our algorithm. We developed a simulation platform to verify this algorithm in a WiMAX mesh network with 20 and 50 mesh SS nodes. The simulation result shows that our algorithm will improve the efficiency varying from 53 percent to 70 percent.

Research on Customer Loss Prediction for Mobile Service Based on Bayesian Network

Hongxin Gui,Changhao Yang,Fei Cheng

2009, 25(3):  70-75.  doi:10.3969/j.issn.1000-0801.2009.03.021

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Accurate prediction of customers loss could enable mobile business to offer different service for specific needs and consumption of users. A model for the forecast of the loss of customers had been constructed based on Bayesian network. And according to the results of case studies，the paper identified the reasons for customer churn tend to look for a customer base with a high tendency to off-grid，and through the characteristics analysis of the classification，the rules of loss of customers had been arrived at and the effectiveness of the model had been verified.

A New Method to Distinguish Interior/ Exterior Users in LTE

Qi Jiangang,Li Zhongnian and Wang Yafeng

2009, 25(3):  74-77. 

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In the study of ICIC (inter-cell interference coordination）of LTE，the basic foundation is to distinguish interior users from exterior users. The existing method, RSRP single-threshold reporting mechanism, will cause UE position information to be switched between “interior UE” and “cell edge UE”. This Ping-pong effect can cause a lot of unnecessary signaling and load a heavy burden on UE battery consumption. Based on this, a new method is proposed, which is RSRP double-thresholds reporting mechanism. The new method can solve the problems above, so as to provide a more efficient way to judge the UE position.

Customer Churn Management Strategy Model in Telecommunication Industry

Guo’en Xia,Peiji Shao

2009, 25(3):  76-84.  doi:10.3969/j.issn.1000-0801.2009.03.023

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A customer churn management strategy model（CMSM）is proposed for the telecommunication industry，which is based on Delta strategy model for firm competitiveness.CMSM is substantiated by using a customer churn dataset of a telecommunication carrier.It is found that the model could describe customer churn reasons and include the main predictor factors related with firm competitiveness strategy，thereby its application is easily controlled.

Scheme of Enhancing the Security of VPN

Huang Jinglian and Yuan Xiujuan

2009, 25(3):  78-81. 

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For MPLS VPN not suitable for the complex network application with high security requirements because of its lack of providing encryption and certification, only achieving point to point security while being incapable of fine-grained security services, a scheme of enhancing the security of VPN is proposed to ensure the integrity and confidentiality of data. It realizes fine-grained security service strategy based on the security domain and role by integrating VPN and IPSec and using cryptographies such as encrypted authentication, etc.

Discussion to the Interzone Between Upper Limit and Lower Limit of Telecommunication Price Regulation

Liu Shan and Dong Shuyi

2009, 25(3):  82-86. 

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This paper raise the concept and some regulation methods of telecommunication price interzone, based on the research literature of telecommunication upper limit and lower limite price regulation, in order to transfer the monotone price competition mode to manifold competition mode, transfer the incomplete information game to complete information game, and hope those methods do favor to the future more effective telecommunication competition regulation.

A Topology Control Algorithm of Wireless Sensor Networks Based on Active Balance of the Energy Expenditure

Xiaowen Liu,Xiaoying Zhu,Ming Hu

2009, 25(3):  85-89.  doi:10.3969/j.issn.1000-0801.2009.03.025

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Frequent topology changes in wireless sensor network has important significance in improving efficiency of routing protocols and MAC protocol，prolonging the survival time of network and raising the efficience of communication. Based on systematic analysis some topology control algorithms，a new hiberarchical topologically generating algorithm is put forwarded in this paper，two parameters-time threshold and energy of node left are introduced and a relatively positive attitude is taken to solve imbalance energy consumption of nodes. The algorithm effectively balances the energy consumption and achieves an obvious improvement on the survival time of network.

Research on Low-Cost Multi-Service Integrated Access EPON System Design

Wu Jianxue

2009, 25(3):  87-89. 

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EPON is a good solution for FTTH. However, when a variety of services are transmitted on EPON, there still exsits a lot of challenges, such as QoS, DBA, high-bandwidth, safty, cost and so on. The industry-leading EPON chipset provider, Teknovus, provided a set of good EPON SoC solution, which can meet the low-cost multi-service integrated access EPON system design. It is bound to further promote the EPON technology.

Analysis of 4G Mobile Communication System and Its Key Technologies

Junxuan Wang

2009, 25(3):  90-93.  doi:10.3969/j.issn.1000-0801.2009.03.027

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The background，characters and network structure of 4G mobile communications were introduced. Key technologies of physical layer of 4G mobile communications networks any such as OFDM，MIMO and network protocols were discussed. The prospect of future communication was analyzed at the end.

Technology Route and Research Present State of MIMO Wireless Communication System

Xiao Hailin,Ouyang Shan and Nie Zaiping

2009, 25(3):  94-98. 

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Multiple-input multiple-output (MIMO) technology can enhance capacity and frequency spectrum utilization efficiency of communication system while maintaining bandwidth, MIMO is one of the most competitive technologies in the next generation mobile communication system. We analyze MIMO wireless communication system spatial correlation, channel modeling, and channel estimation’s research present state, at the same time corresponding technology route are presented in this paper, which establish a solid theoretical basis for profoundly research MIMO communication technology.

Technology Route and Research Present State of MIMO Wireless Communication System

Hailin Xiao,Shan Ouyang,Zaiping Nie

2009, 25(3):  94-98.  doi:10.3969/j.issn.1000-0801.2009.03.028

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Multiple-input multiple-output（MIMO）technology can enhance capacity and frequency spectrum utilization efficiency of communication system while maintaining bandwidth，MIMO is one of the most competitive technologies in the next generation mobile communication system. We analyze MIMO wireless communication system spatial correlation，channel modeling，and channel estimation’s research present state，at the same time corresponding technology route are presented in this paper，which establish a solid theoretical basis for profoundly research MIMO communication technology.

Design and Implementation of SMS Interactive Platform in University

Rao Min and Liu Yongqiang

2009, 25(3):  99-102. 

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This paper discusses about the requirement of application in university, and then puts forward an implementation of SMS interactive platform. In this platform, administrators can put short message to their user, and the user who receive the SMS can reply it. This platform provides a good communication way among university, teacher, student and student’s parents. This platform also gives a chance for university to improve its efficiency.

Design and Implementation of SMS Interactive Platform in University

Min Rao,Yongqiang Liu

2009, 25(3):  99-102.  doi:10.3969/j.issn.1000-0801.2009.03.030

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This paper discusses about the requirement of application in university，and then puts forward an implementation of SMS interactive platform. In this platform，administrators can put short message to their user，and the user who receive the SMS can reply it. This platform provides a good communication way among university，teacher，student and student’s parents. This platform also gives a chance for university to improve its efficiency.