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15 May 2012, Volume 28 Issue 5

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Study on the Key Technologies of Intelligent Mobile Device

Zhao Xuejun,Liang Baiqing,Luo Xuan and Wei Yingqi

2012, 28(5):  1-8. 

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With the widespread use of intelligent mobile device using high performance dual-core and quadri-core CPU, including mobile phone, tablet and hybrid device, development platform will meet the hardware bottleneck. It will not bring new user experience until a complete set of core application services, like new human-machine interaction technology, guaranteed terminal security, cloud-based desktop and application virtualization technology, are in place. This article aims to explore, analyze, and display of the several key technology development status and future trends.

Research on the Key Technologies of Smart Terminal Based on Application Virtualization

Yan Liyun,Zhong Weibin,Li Rongrong and Zhang Ling

2012, 28(5):  9-13. 

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Mobile internet gets greater attention from society recently, for enterprises to establish advanced position in such rapidly developing market, the integration of smart terminal, network and application is critical. Smart terminal enriches the cloud computing based application service manifestations, which offeres a large number of online cloud services. As a result, the mobile internet cloud service providers are focusing on the integration of smart terminal and cloud based applications. This paper analyzes the mainstream of smart terminal cloud computing application models, specifically a virtualization technology based on SaaS cloud computing architecture, and the new requirements for virtualization cloud application platform in the trend of diversity of smart terminal, explain with practical experience, the key technologies of application virtualization adapted to smart terminal.

Research on Development Technology of the Cross Platform Smart Device

Lu Gang,Zhu Peijun,Li Huiyun and Wen Jinjun

2012, 28(5):  14-17. 

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The operating system of the smart terminal including Android, iOS, Windows Phone is different in development language and development tools, carry trouble to application, development and transplantation. Cross platform development allows developers to develop application once, and then running on different platform. This paper analyses main cross platform development technology, proposes the next generation of cross platform development conception, and discusses on its implementation, finally prospect the future.

Research on the Rich Communication Client Technology and Application for Telecom Operator

Zhang Ling,Hu Wensheng,Yang Xinzhang and Yan Liyun

2012, 28(5):  18-23. 

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Depending on its advantages of enhanced communications and SNS supporting, and taking advantages of smart terminals, RCS enriches applications on smart terminals and paves the way of network convergence for telecom operators. Based on RCS key technology, RCS service scenarios on smart terminals are described and demands on terminals are analyzed. Personal opinions on RCS development strategy and prospects for telecoms operators are brought forward.

Research on HTML5 Technology and Application Model

Li Huiyun,He Zhenwei,Li Li and Lu Gang

2012, 28(5):  24-29. 

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HTML5 is a revolutionary new internet programming language, received broad support and rapid development in the internet/mobile internet field. This article researches the new characteristics of HTML5, the browser support of the key technology, and think of the HTML5 application mode from the perspective of network operators.

Frequency Planning of IMT System Based on the Hierarchical Spectrum Demand Forecast

Nie Boshi,Feng Zhiyong,Feng Zebing and Song Xingang

2012, 28(5):  30-36. 

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Radio frequency planning is the foundation of accelerating the development of broadband wireless mobile communication industry, while the spectrum demand forecast is the key of it. This paper provides an innovative hierarchical spectrum demand forecast method based on the ITU-R M.1768 recommendation, game theory and gray prediction. In the hierarchical forecast, firstly it predictes the total spectrum demand of IMT system according to China’s market data, secondly it forecastes the accurate proportion of TDD and FDD demand based on the using status and development strategies of China’s telecommunication operator enterprises, at last it puts forward spectrum planning reference suggestions of IMT system to China.

Study and Application About Intersystem SMS Paging for CDMA Network

Xia Lei,Li Qing,Li Dongliang and Chen Sizhong

2012, 28(5):  37-42. 

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This paper studies and puts forward the requivements of the short message paging technology of the CDMA mobile switch system, mainly describes the technology requirements, call flow work processes and so on of the CDMA mobile switch system SMS paging service switches and adjacent switches, and the application effects of technology used in the network are also assessed. In this paper, the CDMA SMS system paging technology can significantly improve first paging success rate of the CDMA network MT message.

A Bind Source Extraction Method with the Order Based on Artificial Bee Colony Optimization

Wang Rongjie,Zhou Haifeng and Zhan Yiju

2012, 28(5):  43-48. 

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To separate source signals one by one, we consider the blind source extraction problem of instantaneous mixtures using artificial bee colony optimization algorithm. A goal function is constructed first by exploiting the higher statistics prosperities of source signals, then the optimal extracted vectors are determined through maximizing the goal function using artificial bee colony optimization algorithm, so as to separate source one by one. The simulation results show that the method can achieve the blind separation for mixed signals in decreasing order of absolute kurtosis. Moreover, it can separate images of sub-gaussian distribution and speeches of super-gaussian distribution.

A New Adaptive Threshold Algorithm Based on Noise Estimation for Energy Detection

Long Yingxian,Zhang Ning,Zhou Feng and Liang Xuwen

2012, 28(5):  49-53. 

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Spectrum sensing is one of the key technologies in cognitive radio and energy detection is a typical method of it. According to the noise uncertainty problem of conventional energy detection in spectrum sensing, this paper proposes an adaptive threshold algorithm of energy detection based on noise estimation. Combined with the system requirements, the proposed algorithm adopts constant false-alarm probability detection; it adjusts the threshold parameters adaptively using the real-time noise variance estimation based on the noise statistical model. The simulation results show that the proposed algorithm estimates the noise variance accurately and improves sensing performance obviously.

Analysis of the Influence of Antenna Correlation on BER Performance of MIMO System

Qian Yin and Zhou Jie

2012, 28(5):  54-59. 

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In this letter, we derive an exact and approximate equation of spatial correlation based on Laplaciian energy distribution,and analyze the factors which have the effect on saptial correlation and use the results into the analysis of the BER performance of MIMO system. We analyze them in the uniform liner array (ULA) and uniform circular array (UCA) respectively, in which we present relationships of the BER versus the SNR, distance between antennas, and the angle of arrival (AOA) with different decay factors. And we also analyze the factors that determine the BER of the system, and the method of reducing the BER. Finally, when the value of decay factor a is big, the approximate analysis exhibits good agreement with the exact analysis, and makes the computational complexity greatly simplified.

Study on Echo Cancellation Technology of Multipath Channel

Wang Zhenchao,Liang Junjun,Wang Zhuyi and Li Huiya

2012, 28(5):  60-64. 

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In this paper, we study the echo cancellation technology of the on-frequency digital repeater. By analyzing the convergence condition of adaptive filter based on least mean square(LMS) principle, we find that existing adaptive filtering algorithm using delay to eliminate the relevance is not able to guarantee the convergence condition being satisfied in principle, even when the outer channel is a single-path or a main path of multipath channel.We propose a novel algorithm sending the signal into the adaptive estimator after a delaying time to solve the problem. The novel algorithm conditionally improves the effect of echo cancellation. Further more, this paper proposes three new principles to eliminate the multipath echo.

Design of TD-SCDMA Mobile Video Surveillance System Based on HSUPA and Multi-Stream Technology

Hu Fali,Wang Chongping and Zhou Jianming

2012, 28(5):  65-72. 

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TD-SCDMA network is one of the third-generation international standards owned and promoted by China.In the time slot of 2 to 4, the network upstream bandwidth for one user is only 128 kbit/s, restricted the development of video surveillance business. In this paper,we enhanced the uplink capacity with the HSUPA technology and the multi-stream technology, designed and implemented a mobile video surveillance system based on TD-SCDMA network.

Study on Regional Difference of China’s 3G Mobile Phone Users

Ma Daojie and Lv Tingjie

2012, 28(5):  72-79. 

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Based on differences in lifestyle and value, and considering geographical division as well as economic development level, this paper classified China’s consumers into major three areas. Data were collected through a survey of 2 648 consumers. The study revealed significant regional differences in four factors of 3G mobile phone purchasing motivations, including dignity, basic/practical function, fashion/individuality/entertainment and price. Finally a conclusion was made about the variances above.

Research on the Improvement of Reliability of RRC Signaling in the HO in LTE System

Liu Limin,Dong Hongcheng and Li Xiaowen

2012, 28(5):  80-83. 

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In this article,we analyze the impact of power limit on the reliability of RRC signaling in the HO procedure in the LTE system. As the reason of power limit, we put foward a way to reduce the probability of limited power which can improve the reliability of RRC signaling. The results of the simulation show that this scheme can improve the service quality and the user experience.

Research on Improved Algorithm of Monte Carlo Localization

Shao Qingliang,Li Yufeng,Qu Lele and Wang Peng

2012, 28(5):  84-87. 

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In wireless sensor networks the monte carlo localization（MCL）algorithm for mobile nodes has a relative better accuracy. However the frequent resampling of MCL method for strict filtering brought a lot of calculation which increased the node energy consumption. The received signal strength（RSS）based on the monte carlo localization algorithm was proposed. This algorithm uses the distance between anchor nodes and the measured value of the mobile node to correct the RSS mobile node and each anchor node weights between the narrow the traditional range of monte carlo sampling algorithm. The simulation shows that the method reduces the number of monte carlo sampling range and the communication overhead, and increases the node localization accuracy.

Research on SRS Signal Detection and Noise Estimation in LTE System

Zhao Xunwei

2012, 28(5):  88-91. 

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Sounding reference signal(SRS) is defined in LTE system to acquire the uplink channel information. By SRS-based detection and estimation, uplink channel information can be obtained by the eNode B scheduler to perform resource scheduling for uplink transmission. A robust SRS-based channel estimation algorithm is deduced and especially a novel SINR estimation mothed is proposed in this paper. Finally, simulation results under typical channel scenarios show that the method can ensure the precision of the SINR estimation under various channel situation.

Research and Analysis on Converged Video Communication with “De-Teleco” Solution

Han Jianting,Ke Wei and Wan Xiang

2012, 28(5):  92-98. 

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This article mainly targeted on the difference of video communication on the internet and provided by telecos with detailed comparison on their architecture, service provisioning, functionality, reliability, access protocols, dialing number, QoS,terminal devices, and interoperability. According to the analysis,a new phrase “de-teleco” is proposed to be the key factor for Telecos’video communication, which indicates non-customized terminals, open architecture, internet-mode management,centralized deployment and operation. Finally, some “de-teleco” advices on product forms, implementation and deployment, market strategy of video communication are given as a conclusion in this article.

Enhancement of Network Selection Mechanism Between WLAN and Cellular Network Based on ANDSF

Yang Jing,Sun Tao and Wei Bing

2012, 28(5):  99-103. 

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With constantly upgrade of cellular network，widely deployment of WLAN hotspots and largely development of intelligent terminals, users want to have a consistent, smooth and efficient services experience. In order to make use of network resources reasonably and make it convenience for users to select the right access network, the network selection between WLAN and cellular networks plays an important role. This paper presents the relevant techniques of existing access network discovery and selection, analyses the limitations of network selection between WLAN and cellular networks based on ANDSF, and proposes a new network selection scheme based on the state of access.

An Improved Algorithm Used to Estimate the CP Type in TD-LTE System

Chen Fatang,Ji Yingying and Teng Wang

2012, 28(5):  104-108. 

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Cyclic prefix(CP) is very important to prevent inter-symbol interference in TD-LTE systems, the receiver must calculate the type of CP in order to obtain the right FFT decode window. Base on the CP’s character, copying fixing length data from end of the symbol sequence, presents two algorithms,sequence correlation and energy difference, which can confirm the type through correlation degree and energy difference between different sequence lengths. Finally, considering algorithm complexity and DSP realization, improve on energy difference algorithm, using part sequence instead of whole sequence. Simulation result and algorithm theory show the effectiveness and low complexity.

Object Tracking Algorithm for Binary WSN Based on APF

Zhu Jinfang,Zhang Xiaoying and Fan Yiming

2012, 28(5):  109-114. 

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Object Tracking Algorithm for Binary WSN Based on APF

Android Privilege Escalation Vulnerability Attacks Detection

Shen Cailiang,Tang Keping,Yu Lifeng and Fan Fuwei

2012, 28(5):  115-119. 

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In recent years, the Android system developed rapidly. It has become the leader of the smart phone operating system. The research of Android security mechanisms is significant. This article briefly describes the security mechanisms of the Android system, and then introduces the principle of Android privilege escalation attacks, then give two methods——vulnerability detection before the application installed and IPC monitoring on runtime, to improve the capacity of preventing Android privilege escalation attacks.

Large-Scale Dynamic Traffic Information Delivery Using Evolved Multimedia Broadcast Multicast Service

Lou Lu

2012, 28(5):  120-126. 

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To address the problem that dynamic traffic information need a low-cost and efficient real-time delivery to improve driving safety and avoid traffic jam and accident, this paper presents a large-scale delivery method to broadcast dynamic traffic information using 3G LTE evolved multimedia broadcast multicast service. The technology advantages of E-MBMS as a dynamic traffic information delivery platform are discussed. With the simulation experiment, the performance of the raptor FEC in the FLUTE protocol is analyzed and results show the proposed method is efficient and suitable for delivering dynamic traffic information without error.

Application of OTA in Terminal Test System for Operators

Huang Xiaolei,An Gang and Gao Yiwei

2012, 28(5):  127-132. 

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OTA test(test for antenna performance) is one of the vital test items in wireless device authentication test. Concepts of OTA and requirements made by relevant standards is introduced in this paper, in addition, three solutions of OTA test are analyzed in detail. The original field electromagnetic anechoic chamber, one of the schemes, is one of the popular solutions currently. However, some problems arise in this system, including huge investment, high difficulty in construction and unabling to test MIMO terminal without upgrading. While the reverberation chamber enjoys a high reputation with its high test speed, small size and the ability to test MIMO terminal. What’s more, this solution is authorized by 3GPP in 2011 December. Finally, constructive opinions are suggested in this paper, and shows that it is necessary to perform OTA testing for operators.

Research of Browser/Server Architecture System Migration and Implementation of Cloud Computing

Li Shusheng,Duan Yong,Shi Yirong and Ye Yuhang

2012, 28(5):  133-141. 

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This article analyzes the system migration problem and solution of telecom BS-based systems, and also researches the IaaS and PaaS cloud computing solutions of those systems. Proposed two IaaS program and one PaaS program,it can effectively solve the problem in the implementation of cloud computing in the Web and application layer of telecom BS-based systems.Given the evolution path and the stages recommendations of system migration and implementation of cloud computing, those have good value to the application of cloud computing in the telecom IT support systems.

The Designing Method of ODN for FTTH

Zhang Jun

2012, 28(5):  142-150. 

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In order to meet the needs of the national informatization strategies, including triple play, smart city, fundamental broadband network construction and etc, the telecommunication service providers in China are now actively progressing on the replacement of the copper access network with fibers. And during this process, ODN(optical distribution network) is the most critical and difficult part of the construction and renovation of FTTH. The design and the standardization of the ODN scheme are vital subjects to the telecom service providers.This article provides a comprehensive discussion on the design method of FTTH ODN, including the topics of how ODN can support the development of PON techniques, ODN coverage radius, the splitting method, the splitter locating, the user cable network topology, cross connecting distribution method and ODN network acceptance metrics.

New Problems of Radio Network Optimization in Dense Urban Areas

Zhou Xingwei and Shen Chen

2012, 28(5):  151-154. 

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This paper focuses on in-depth analysis on the new radio network optimization problems with rapid growth in 2G traffic and increasing traffic density in dense urban areas. Relevant solutions and proposals are given for problems such as network structure, intermodulation interference caused by antenna and passive components, data service interference and in-depth indoor coverage quality which lead to poor voice quality and network interference.