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Jing H.,China Academy of Telecommunication Research of MIIT
Communications in Computer and Information Science | Year: 2015

To deal with the threat of over the top (OTT) applications, many operators launch their own rich communication services over LTE. China Mobile also declares the overall commercial of rich communication services in 2015. The rich communication services integrate abundant multimedia, media and social characteristics into the traditional telecom services. While these characteristics provide a superior user experience, they also attract the scammers to utilize these services as the new channel of spreading digital misinformation, launching mass events, phishing and so on. Besides these, the LTE/SAE network and user terminals also pose much security challenges to the RCS services. In this paper, we firstly and systematically assess the security risk of rich communication services based on their three-tier architecture, which aims at improving the security of rich communication services. © Springer-Verlag Berlin Heidelberg 2015. Source

Ji S.,China Academy of Telecommunication Research of MIIT
World Information on Earthquake Engineering | Year: 2012

Anti-seismic studies can not be ignored in the communication industry. This article compares and analyzes the required response spectrum based on the seismic test standards of communication equipment in the United States, Japan and Europe, discusses the special performance requirements of shaking table for the communications equipment's seismic test and finally presents the suitable performance indices. It will help the research staff to select the shaking table for the seismic test of the communication equipments reasonably. Source

Jin Z.,Tianjin University | Gao M.,Tianjin University | Chen Z.,China Academy of Telecommunication Research of MIIT
Dianbo Kexue Xuebao/Chinese Journal of Radio Science | Year: 2012

Multiple-input multiple-output(MIMO) technology is the key of 3rd Generation Partnership Project(3GPP) long term evolution(LTE) and other advanced wireless communication technology. It greatly depends on the low spatial correlation and MIMO antenna optimization to achieve large capacity and enhance other performance of MIMO system. According to the basic theory of electromagnetism and space channel model(SCM), we analyze the LTE MIMO spatial correlation and channel capacity. We combine the mutual coupling and fix the channel capacity model during the process of analyzing the channel capacity. The results show that in urban micro-cell environment and in suburban macro-cell environment, it can achieve zero correlation and channel capacity of 12.5 bps/Hz(urban micro-cell), 10. 5 bps/Hz(suburban macro-cell) when the antenna spacing is 0.4 λ and the down-stream antenna is 4×4. These configurations can be widely used in the LTE terminal antenna array to optimize the antenna effect. Copyright © 2012 by Editorial Department of Chinese Journal of Radio Science. Source

Xu H.,University of Science and Technology Beijing | Lin R.,China Academy of Telecommunication Research of MIIT
China Communications | Year: 2016

In this paper, we propose a non-cooperative differential game theory based resource allocation approach for the network security risk assessment. For the risk assessment, the resource will be used for risk assess, including response cost and response negative cost. The whole assessment process is considered as a differential game for optimal resource control. The proposed scheme can be obtained through the Nash Equilibrium. It is proved that the game theory based algorithm is applicable and the optimal resource level can be achieved based on the proposed algorithm. © 2013 IEEE. Source

Luo Z.,China Academy of Telecommunication Research of MIIT
IEEE Transactions on Information Theory | Year: 2011

In this paper, a novel iterative soft joint detection algorithm for orthogonal frequency division multiplexing (OFDM) systems is proposed. Without the need of channel estimation, it directly generates the a posteriori probabilities (APPs) of data symbols by very efficient computation. With the increase of iterations, the proposed algorithm gradually achieves near-optimal performance, while its complexity is only linear in the number of subcarriers. © 2011 IEEE. Source

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