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A Performance Evaluation of Spatial Indices for Geospatial Publish/Subscribe Systems 地理空间发布/订阅系统的空间指标性能评价
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848503
K. Pripužić, Damjan Katusic, M. Marjanović, Aleksandar Antonic, I. Livaja
{"title":"A Performance Evaluation of Spatial Indices for Geospatial Publish/Subscribe Systems","authors":"K. Pripužić, Damjan Katusic, M. Marjanović, Aleksandar Antonic, I. Livaja","doi":"10.1109/ConTEL.2019.8848503","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848503","url":null,"abstract":"In a publish/subscribe system, publishers publish information content which they want to distribute among subscribers, who, on the other hand, need to subscribe to publications of interest by activating appropriate subscriptions. Traditional content-based publish/subscribe systems define a publication as a set of properties (i.e., name-value pairs), while a subscription is defined as a set of various constraints on publication properties. Therefore, they basically define a publication and subscription as a point and hyper-rectangle in a multidimensional attribute space, respectively. In this paper we focus on a geospatial publish/subscribe system in which each publication and subscription content is extended with a geospatial object (e.g., a point or polygon). Such an object is used to express the location of a published event or subscription interest. To efficiently match incoming publications in real-time with a set of stored subscriptions, it is necessary to index subscriptions in an appropriate data structure. Spatial indices are typically used in literature for indexing of geospatial objects. In this paper we experimentally evaluate the performance of several spatial indices when used for indexing of geospatial subscriptions in order to efficiently match incoming publications with stored subscriptions.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"125 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129711293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Portable MiniLab for Hands-on Experimentation with Software Defined Networking 便携式迷你实验室动手实验与软件定义的网络
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848560
Sebastian Troia, L. M. M. Zorello, G. Maier, G. Verticale, P. Giaccone
{"title":"Portable MiniLab for Hands-on Experimentation with Software Defined Networking","authors":"Sebastian Troia, L. M. M. Zorello, G. Maier, G. Verticale, P. Giaccone","doi":"10.1109/ConTEL.2019.8848560","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848560","url":null,"abstract":"The new paradigms brought to the networking area by softwarization, not only are revolutionizing research and industry, but start deeply impacting on teaching. While in the past most of education in basic networking relied upon studying theory and learning standard protocols, today the hands-on experience is gaining paramount importance. In this paper, after briefly explaining how SDN changed the learning experience, we present a portable, low-cost, self-contained hardware laboratory to experiment with real SDN networks based on OpenFlow switches, valuable for both teaching and research. We then show some use-case that can be investigated within possible projects developed using this testbed. Though devised mainly for SDN, we will show that this testbed can support experimentation also of traditional switching concepts, such as packet classification. Finally, we introduce a short demonstration that can be presented live at the conference.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129116407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
University collaboration in creating and implementing innovative intensive programme focussed on ICT 大学之间的合作，创建和实施以信息和通信技术为重点的创新强化课程
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848563
Jurica Babic, I. Lovrek, V. Podobnik, F. Peñaranda-Foix
{"title":"University collaboration in creating and implementing innovative intensive programme focussed on ICT","authors":"Jurica Babic, I. Lovrek, V. Podobnik, F. Peñaranda-Foix","doi":"10.1109/ConTEL.2019.8848563","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848563","url":null,"abstract":"This paper deals with the conceptual issues of creating and implementing an innovative intensive study program based on the partnership of universities from several European countries. A model of such an interdisciplinary programme focussed on information and communication technology (ICT) is considered, with particular attention to the transnational and intercultural context. Blended mobility, student teamwork and project-based learning as interconnected components of the programme are elaborated. Two created and implemented study programmes supported by Erasmus, the EU Programme in the fields of education, training, youth and sports, are presented as case studies.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115483325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Modern Mobile Emergency Applications: Fact or Fiction? 现代移动应急应用:事实还是虚构?
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848551
Urban Sedlar, Luka Korsic, J. Sterle, Jaka Cijan, M. Volk
{"title":"Modern Mobile Emergency Applications: Fact or Fiction?","authors":"Urban Sedlar, Luka Korsic, J. Sterle, Jaka Cijan, M. Volk","doi":"10.1109/ConTEL.2019.8848551","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848551","url":null,"abstract":"In this paper we explore how mobile emergency applications compare to existing means of reaching emergency services, and outline some important problems blocking their more widespread adoption. Many problems, such as roaming and standardized data exchange between the citizen and the public safety answering point (PSAP) were recently addressed in the Pan-European Mobile Emergency Application (PEMEA) standard; some remain strictly in the domain of the vendors, for example, deep integration with the mobile operating systems. However, a broader set of problems relates to communication and mobile networks: the way such calls are charged, prioritized, and integrated with the back-office systems of the telecom providers. We explore how some of these challenges could be addressed in 5G networks with their strong focus on softwarization, virtualization, network slicing and mobile edge computing. Finally, we also address several business-related challenges, such as user awareness, application discoverability and usability, and present our attempt at addressing low user awareness in critical situations.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123346486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The first tests of smartphone camera exposure effect on optical camera communication links 首先测试智能手机相机曝光对光学相机通信链路的影响
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848559
S. Teli, S. Zvánovec, Zabih Ghassemlooy
{"title":"The first tests of smartphone camera exposure effect on optical camera communication links","authors":"S. Teli, S. Zvánovec, Zabih Ghassemlooy","doi":"10.1109/ConTEL.2019.8848559","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848559","url":null,"abstract":"In this paper, we study the effect of smartphone camera exposure on the performance of optical camera communications (OCC) link. The exposure parameters of image sensor sensitivity (ISO), aperture and shutter speed are included. A static OCC link with a 8×8 red, green and blue (RGB) LED array employed as the transmitter and a smartphone camera as the receiver is demonstrated to verify the study. Signal-to-noise ratio (SNR) analysis at different ISO values, the effect of aperture and shutter speed on communication link quality is performed. While SNRs of 20.6 dB and 16.9 dB are measured at 1 m and 2 m transmission distance, respectively for a ISO value of 100, they are decreased to 17.4 dB and 13.32 dB for a ISO of 800. The bit error rate (BER) of a 1 m long OCC link with a camera’s shutter speed of 1/6000 s is 1.3×10−3 (i.e., below the forward error correction BER limit of 3.8×10−3) and is dropped to 0.0125 at a shutter speed of 1/20 s. This study provides insight of the basic smartphone settings and the exposure adjustment for further complex OCC links.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122979577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Beam Quality Factor and Its Effect on Laser Beam through Anisotropic Turbulence for OWC 光阱各向异性湍流中光束质量因子及其对光束的影响
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848537
Zhan Gao, Ziyang Li, A. Dang
{"title":"Beam Quality Factor and Its Effect on Laser Beam through Anisotropic Turbulence for OWC","authors":"Zhan Gao, Ziyang Li, A. Dang","doi":"10.1109/ConTEL.2019.8848537","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848537","url":null,"abstract":"For optical wireless communication (OWC), beam quality factor is used as an important parameter to evaluate the propagation of laser beam through atmospheric turbulence. The beam quality factor and its effect on laser beam are investigated using the generalized anisotropic non-Kolmogorov power spectrum such that anisotropy property of turbulence, general spectral power law, and turbulence inner and outer scales can be considered together. We derive new expressions of beam quality factor for the lowest-order Gaussian beam and higher-mode Hermite-Gaussian beam. The effect of beam quality factor on the beam intensity through turbulence is also analyzed. Numerical results are presented to exhibit influences of different turbulence parameters on the beam quality factor and further on the propagation of laser beam, which provides a better understanding for OWC over free space.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127155630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A Simulation Environment for UWB Hardware Development and Protocol Design 超宽带硬件开发与协议设计的仿真环境
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848535
David Veit, M. Gadringer, E. Leitgeb
{"title":"A Simulation Environment for UWB Hardware Development and Protocol Design","authors":"David Veit, M. Gadringer, E. Leitgeb","doi":"10.1109/ConTEL.2019.8848535","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848535","url":null,"abstract":"Modelling the physical layer of an ultra-wideband impulse radio in presence of interference and multipath channels is a demanding task and involves a couple of assumptions and simplifications which have a strong impact on the performance of network simulations. Even more important, most of these models cannot predict the influence on the ranging estimate produced by ultra-wideband systems. These ranging estimates are critical for localization systems, which are one of the main use cases for ultra-wideband technology. In this contribution we present a physical layer simulation environment that is able to simulate the impact of interference, multipath, noise, pulse shape and hardware components like amplifiers, analog-to-digital converters and more on bit error rate and ranging error. Parallel computing is employed to keep simulation times in a reasonable time frame, while simulation results and input parameters are stored in a database to allow an easy exchange of data with third party software. With this software system architects are able to simulate UWB system level behavior and tweak individual parameters to achieve optimal overall performance.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117211167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
APD and SPAD Receivers : Invited Paper APD和SPAD接收器:特邀论文
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848547
H. Zimmermann
{"title":"APD and SPAD Receivers : Invited Paper","authors":"H. Zimmermann","doi":"10.1109/ConTEL.2019.8848547","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848547","url":null,"abstract":"Integrated receivers with avalanche photodiodes (APDs) and single-photon avalanche diodes (SPADs) fabricated in 0.35μm CMOS and BiCMOS technologies are introduced. The APD receivers were used in error-free optical wireless communication (OWC) experiments with maximum transmission distances from 11m to 27m at 1Gb/s and from 6.5m to 16.5m at 2Gb/s without receiver lense and without optical filter. The APD receivers work up to and exceeding 2000lx ambient light. The newest trend are SPAD-based receivers, which reduce the gap to the quantum limit. The state of the art of SPAD receivers will be summarized and reviewed also in comparison to APD receivers.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130255808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Some Notes on Phase Noise Generation and the Impact on DVB-S2x Waveforms 相位噪声的产生及其对DVB-S2x波形的影响
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848548
H. Schlemmer, J. Ebert, Tobias Taenzer, W. Gappmair
{"title":"Some Notes on Phase Noise Generation and the Impact on DVB-S2x Waveforms","authors":"H. Schlemmer, J. Ebert, Tobias Taenzer, W. Gappmair","doi":"10.1109/ConTEL.2019.8848548","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848548","url":null,"abstract":"Designing a communication link, one has to take into account that phase noise might cause a significant degradation of the error performance. Depending on the scenario, it can be particularly challenging to mitigate the influence of this sort of impairment, which is mainly due to its random walk property. In this context, the shaping of phase noise is an important task throughout the simulation phase of a project. Using several masks recommended for satellite communications, we discuss two major modeling methods with respect to their accuracy and computational complexity: the first one is based on discrete Fourier transforms, the second one uses a bank of recursive filters. Furthermore, we address the limitations to mitigate the impact of phase noise by means of a tracking module. Finally, the performance degradation of a DVB-S2x implementation is illustrated, which has been investigated in the framework of several projects guided by the European Space Agency.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122912455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Call Blocking Probabilities in a Two-Link Loss Model with Restricted Accessibility 具有受限可达性的双链路丢失模型中的呼叫阻塞概率
2019 15th International Conference on Telecommunications (ConTEL) Pub Date : 2019-07-01 DOI: 10.1109/ConTEL.2019.8848554
I. Keramidi, I. Moscholios, P. Sarigiannidis, M. Logothetis
{"title":"Call Blocking Probabilities in a Two-Link Loss Model with Restricted Accessibility","authors":"I. Keramidi, I. Moscholios, P. Sarigiannidis, M. Logothetis","doi":"10.1109/ConTEL.2019.8848554","DOIUrl":"https://doi.org/10.1109/ConTEL.2019.8848554","url":null,"abstract":"In this paper we study the impact of restricted accessibility in a system of two parallel links that accommodates Poisson arriving calls from a single service-class. In a restricted accessibility system, a new call may be blocked even if available bandwidth units do exist at the time of its arrival. In the two-link system, each particular link has a low and a high threshold. Both thresholds express the number of in-service calls in the link. The low threshold shows the point up to which the link can support offloaded calls from the other link. The high threshold shows the point where one link starts offloading calls to the other link. The two-link system with restricted accessibility is modelled as a loss model whose steady state probabilities do not have a product form solution. In order to determine the main teletraffic performance metric in this model which is call blocking probabilities, we propose an approximate method. The accuracy of this method is verified via simulation and found to be quite satisfactory.","PeriodicalId":182429,"journal":{"name":"2019 15th International Conference on Telecommunications (ConTEL)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117279698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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