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检索条件"机构=Beijing Key Laboratory of Network System Architecture and Convergence"

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A Bi-direction hybrid routing algorithm in mobile hybrid wireless networks 10

A Bi-direction hybrid routing algorithm in mobile hybrid wir...

引用

10th International Conference on Wireless Communications, networking and Mobile Computing, WiCOM 2014

作者： Li, Xiaolong Hao, Jianjun Guo, Yijun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Post and Telecommunications Beijing China

ISBN: (纸本)9781849198455

In this paper, we propose an efficient routing algorithm based on AODV for the Mobile Hybrid Wireless networks (MHWNs), which consists of the mobile ad hoc networks (MANETs) and an infrastructure wireless networks (such as cellular networks). In MANETs, the performance of the networks has been greatly challenged by the mobility from nodes and link state changes, while the link in cellular networks remains stable link with the mobile stations. This algorithm for routing construction takes advantage of the features of MHWNs, such as hybrid radio channels and nodes heterogeneity, to accomplish the bi-direction routing discovery on demand. Our results show that the performance of MHWNs is improved in the time and overhead for route path discovery process the under our bi-direction route algorithm.

关键词： Routing algorithms

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Interoperability test of northbound interface for a transport SDON prototype

Interoperability test of northbound interface for a transpor...

引用

OptoElectronics and Communications Conference, OECC

作者： Ruixue Gong Guochu Shou Yihong Hu Zhigang Guo Guoying Zhang Hui Ding Beijing Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China China Academy of Information and Communication Technology CAICT former China Academy of Telecom Research Beijing China

This paper describes the work done to test the interoperability of northbound interface implemented in the controllers of a transport SDON prototype. A test framework named NBI Platform is introduced and used in this ... 详细信息

关键词： Topology network topology Prototypes Interoperability Optical fiber networks Testing Browsers

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WiFi band-stop FSS for increased privacy protection in smart building

WiFi band-stop FSS for increased privacy protection in smart...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Xiong Xiong Weijun Hong Zhentao Zhao Li Deng Shufang Li College of Electronic and Information Engineering South China University of Technology Guangzhou China Beijing Key Lab. of Network System Architecture and Convergence Beijing Univ. of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467374422

This paper proposes a periodic double ring strip frequency selective surface (FSS) with dual-band stop behavior. The FSS elements are designed to be etched on the transparent coating of glass substrate in smart buildings, which acts as a dual-band notch filter on 2.45GHz and 5.4GHz to avoid the leakage of WiFi signal outside the building. All the simulation parts are simulated by using High Frequency Structure Simulator (HFSS). The proposed FSS possesses 450MHz and 960MHz bandwidth with insertion loss more than -10dB around the two central operating frequencies 2.45GHz and 5.45GHz, respectively. Furthermore, the unit-cell structure provides a stable performance for both TE and TM polarizations with incident angles 0°-60°. A prototype of the proposed FSS is fabricated and measured. Good agreement between the simulated and measured results is obtained.

关键词： Frequency selective surfaces convergence Communication system security Wireless communication Prototypes

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Measurement-based tapped-delay-line (TDL) models for wireless channels under high speed railway scenarios at 2.6 GHz

Measurement-based tapped-delay-line (TDL) models for wireles...

引用

21st International Conference on Telecommunications, ICT 2014

作者： Qian, Wang Chunxiu, Xu Min, Zhao Siyu, Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781479951413

The dramatic development of high speed railway (HSR) has spurred great interest in extensive studies on the fading characteristics of the radio channel in all the relevant scenarios. Approved by the Ministry of Railways of China, single input single output (SISO) measurements were performed at 2.6 GHz with 40 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. In this paper, we provide some fading parameters including the mean excess delay, root-mean-square (RMS) delay spread, the number of paths and the delay Doppler spectrum under diverse HSR scenarios. Plain, viaduct and hilly terrain scenarios are all involved. Based on the extensive body of measured data, tapped-delay-line (TDL) models are established to characterize the time-varying wireless channel, which can be directly employed in the evaluation and comparison of various HSR transmission projects. All these results and models are expected to provide an insight into the behaviors and performance of wireless cellular communication in HSR scenarios. © 2014 IEEE.

关键词： Railroad transportation

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Propagation characteristics of high speed railway radio channel based on broadband measurements at 2.6 GHz

Propagation characteristics of high speed railway radio chan...

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2014 IEEE Wireless Communications and networking Conference, WCNC 2014

作者： Qian, Wang Chunxiu, Xu Muqing, Wu Min, Zhao Deshui, Yu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781479930838

With the rapid development of high speed railway (HSR), propagation characteristics of channels in HSR scenarios are therefore in urgent demand. We conducted numerous single input single output (SISO) measurements at 2.6 GHz with a bandwidth of 20 MHz along the Harbin-Dalian passenger dedicated railway line. Here, first analytical results in hilly terrains are provided. A double-slope path loss model fits measured data well and shadow fading is extracted to be log-normal distributed. Statistical results of small-scale fading are presented and compared in near regions and far regions relative to the transmitter, including the mean excess delay, root-mean-square (RMS) delay spread and the number of paths. Meanwhile, the delay Doppler spectrum is given out and verified. Finally, tapped-delay-line (TDL) channel model is established in detail based on the measured data. It is supposed that these results and models have a promotion for the further evaluation, simulation and design of the wireless communication system in HSR. © 2014 IEEE.

关键词： Railroad transportation

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Comparative analysis on fading characteristics of the LTE-R channel in viaduct and hilly terrain scenarios

Comparative analysis on fading characteristics of the LTE-R ...

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2014 International Symposium on Wireless Personal Multimedia Communications, WPMC 2014

作者： Lin, Xiangli Xu, Chunxiu Siyu, Zhang Zhao, Ruojun Xiang, Xiao Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9789860334074

Long Term Evolution (LTE) system used in High-Speed Railway (HSR) has gained the increasing attention therefore the measurements and analysis of the broadband wireless channel for the HSR communication is urgently needed. This paper focuses on the special fading characteristics of viaduct and hilly terrain scenarios based on the extensive and practical multiple input multiple output (MIMO) measurements which is conducted on Harbin-Dalian passenger dedicated railway line at 2.6 GHz with a bandwidth of 40 MHz. Here, we provide the power delay profiles as the first analytical results. Large-scale fading parameters such as path loss and shadow fading are given and discussed. As for small-scale fading, two similar but not identical K-factor models in different scenario are presented for comparison. Through the analysis on the two typical scenarios, this paper provides great guiding significance for promoting evaluation, simulation and design of the wireless communication system based on Long Term Evolution Railway (LTE-R). © 2014 National Institute of Information and Communicatio.

关键词： Long Term Evolution (LTE)

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Measurements and analysis of a 4×4 vehicle-to-ground MIMO channel using SAGE

Measurements and analysis of a 4×4 vehicle-to-ground MIMO c...

引用

2014 International Symposium on Wireless Personal Multimedia Communications, WPMC 2014

作者： Jiaqi, Yang Muqing, Wu Ruojun, Zhao Qian, Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9789860334074

The widely used broadband wireless technology enables a novel application of providing high-quality communications between vehicles and traffic control centers, which is collectively referred to as vehicle-to-ground communications. Channel modeling is in rapidly increasing demand to design and optimize the vehicle-to-ground communication systems. And practical channel models are only available when accurate estimations of the channel parameters are feasible. By adopting quadrature encoding and spectrum spreading, a novel and low-cost measurement method is proposed in this paper. The method can be implemented to achieve channel matrix accurately and furthermore determinate the parameters of a MIMO channel by using the space-alternating generalized expectation-maximization (SAGE) algorithm. Then the method was carried out in a measurement of a vehicle-mounted 4×4 MIMO system. Both large-scale and small-scale fading are investigated and analyzed. A path loss (PL) model and characteristics of channel parameters including PDP, K-factor, angle of arrival (AOA), angle of departure (AOD) and spatial correlation matrixes for V2G channel modeling are given based on the estimations. These results offer a valuable reference for future studies. © 2014 National Institute of Information and Communicatio.

关键词： Quality control

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A Weak Password Cracker of UHF RFID Tags

A Weak Password Cracker of UHF RFID Tags

引用

Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing, UIC-ATC

作者： Zhentao Zhao Shufang Li Yang Kang Jiankai Li Shengguang Li Weijun Hong Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing People's Republic of China Police Key Laboratory of IoT Application of the Ministry of Public Security P.R.C First Research Institute of the Ministry of Public Security of PRC Beijing People's Republic of China

ISBN: (纸本)9781467372121

Under the ISO/IEC 18000-6C protocol of UHF RFID an electronic tag's information security is based on password protection, but its natural defect is unable to reject brute tests which can be exhaustive. By the protocol analysis, this article theoretically proves that tags' weak passwords can be cracked. Combined with a concrete Tag-Interrogator module a method for improving the cracking efficiency is given out with a special concise password library. Furthermore this paper implements the password cracker has carried on the exploration of distributed detection. By this method most electronic tags' passwords can be cracked within one week. The ultimate goal of this paper is to remind that UHF RFID industry projects should enhance the security level of tag's password practically.

关键词： Radiofrequency identification Dictionaries Security Encoding Protocols Databases IEC Standards

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Multi-layered rate control for collaborative MIMO in LTE-advanced

Multi-layered rate control for collaborative MIMO in LTE-adv...

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2014 IEEE Workshop on Advanced Research and Technology in Industry Applications, WARTIA 2014

作者： Wang, Hengyou Qian, Wang Wang, Dongyang Wu, Muqing Laboratory of Network System Architecture and Convergence Beijing University of Posts and TeleCommunication Beijing China

ISBN: (纸本)9781479969890

In Long Term Evolution-Advanced (LTE-A) system, collaborative MIMO schemes are widely proposed as a method to mitigate inter-cell interference (ICI). In this paper, we develop a collaborative MIMO scheme called multi-layered rate control (MLRC). Simulation results reveal that the proposed scheme improves the cell-edge UE performance without sacrificing the average sector throughput compared to fractional frequency reuse (FFR) with UE specific power control that was employed in the LTE system to mitigate the inter-cell interference. In addition, less information is required to be shared between the collaborative base stations. © 2014 IEEE.

关键词： Power control

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Lifetime-based greedy caching approach for content-centric networking

Lifetime-based greedy caching approach for content-centric n...

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21st International Conference on Telecommunications, ICT 2014

作者： Qian, Hu Muqing, Wu Dongyang, Wang Song, Guo Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781479951413

In Content-centric networking (CCN), in-network caching can enhance content delivery at a global scale without requiring special infrastructure. In this paper, we propose a lifetime-based greedy caching approach (LBGC) which involves both caching decision and cache replacement. Contents are preferred to be stored in nodes with high betweenness centrality, and only expired cache items can be replaced by new arrival contents, which differs from least recently used (LRU) strategy and guarantees the caching of popular contents. Simulation results indicate that LBGC can improve the cache hit ratio and reduce average hops to get content items compared with other caching approaches. © 2014 IEEE.

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