Dissertations / Theses: 'Global System for Mobile communications (GSM)'

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Kan, Ka Ho. "Location estimation system based on the GSM network." HKBU Institutional Repository, 2004. http://repository.hkbu.edu.hk/etd_ra/524.

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Sharma, Bishal. "Radio frequency optimization of a Global System for Mobile (GSM) network." Menomonie, WI : University of Wisconsin--Stout, 2008. http://www.uwstout.edu/lib/thesis/2008/2008sharmab.pdf.

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Darweesh, Turki H. "Capacity and performance analysis of a multi-user, mixed traffic GSM network." Ottawa, 1999.

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Falk, Lolita. "Konstruktion av SMS-Gateway för effektökande SMS-tjänster." Thesis, University West, Department of Informatics and Mathematics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-594.

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Silva, Vanessa Sérgio da. "Sistemas de M2M utilizando GSM." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/5602.

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Mestrado em Engenharia Electrónica e Telecomunicações
Com esta dissertação pretende-se estudar e projectar um sistema de controlo e comunicação M2M (Machine to Machine) que monitorize elementos móveis, por recurso a comunicações GSM (Global System for Mobile Communications). A solução proposta implica monitorizar e colectar informação telemática de um veículo, utilizando o canal GSM. O dispositivo utilizado consiste num módulo GSM/GPS, programado por linguagem Python, de forma a permitir obter informação específica via GPRS. O trabalho desenvolvido foi ainda integrado numa base de dados GIS em desenvolvimento no Instituto de Telecomunicações de Aveiro.
This dissertation aims to study and design a system for control and communication M2M (Machine to Machine) for mobile elements monitorization, using the communications GSM (Global System for Mobile Communications). The proposed solution involves collecting information and monitoring a vehicle‟s telematic data, using the GSM channel. The device used consists of a module GSM/GPS, programmed in Pyhton language, to allow specific information via GPRS. This work was also integrated into a GIS database developed at the Institute of Telecommunications Aveiro.

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Cuvelliez, Charles. "Etudes des modèles d'implémentation des opérateurs de réseaux mobiles virtuels." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210895.

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This thesis addresses the phenomena of Mobile Virtual Network Operators (MVNO): often MVNO do not come from the telecom sector but they rent the network to mobile operators to become fully mobile operators on their own. So they compete directly not only with the other mobile operators but also with their hosting mobile operator.

Hosting MVNOs, supporting them from both operational and commercial perspectives are new challenges for the mobile operators: they have to set up a specific internal organization because they used to be a vertically integrated industrial structure. All of this represents tremendous changes for them.

This thesis describes first the strategic models for hosting MVNOs. The regulatory aspects, that are an essential driver for the liberalization of network economies, are then analyzed. The key point is: are the MVNO able to increase the efficiency and competitiveness of mobile markets.

Another important aspect is the modelling of a mobile network: the MVNOs will use some components while other components are unuseful for them. Without such model, it is impossible to derive the right costs and price to be charged to the MVNO in order to have a win win industrial model for both the MVNO and its hosting operator.

A case study of a corporate MVNO focusing on needs of multinationals is analyzed. Such case study describes all the steps for an economic actor to become MVNO from scratch. Such MVNO are not yet present although there is a market demand.

The last chapter makes a comparative study of the MVNO markets in the European Union.

Cette étude aborde le phénomène des opérateurs de réseaux mobiles virtuels ;il s’agit d’acteurs économiques - parfois sans lien aucun avec les télécommunications - qui louent le réseau d’opérateurs mobiles ;ils deviennent à leur tour opérateurs à part entière au point de devenir concurrent non seulement des autres opérateurs mobiles mais aussi de l’opérateur mobile qui leur a loué une partie de son réseau.

L’hébergement technique de l’opérateur virtuel, son support opérationnel et commercial, l’organisation que doit mettre en place l’opérateur mobile pour héberger son opérateur virtuel afin de partager avec lui son réseau sont des nouveaux défis auxquels les opérateurs mobiles, habitués à être des structures industrielles totalement intégrées verticalement, font face pour la première fois.

Cette étude traite des modèles d’implémentation des opérateurs de réseaux mobiles virtuels :elle aborde d’abord les aspects stratégiques qui fixent le cadre pour les opérateurs mobiles qui veulent ou sont forcés à héberger des opérateurs virtuels. Les aspects réglementaires, une composante essentielle des économies de réseaux en voie de libéralisation, sont ensuite étudiés, en particulier, comment les opérateurs virtuels peuvent contribuer à améliorer la compétitivité et la libéralisation de ces marchés.

L’étude modélise ensuite le réseau d’un opérateur mobile de façon à mettre en évidence les éléments à partager qui seront utilisés par l’opérateur virtuel. Cette modélisation est essentielle pour déterminer le coût de l’hébergement et du partage du réseau de façon à créer les conditions de rentabilité de ce modèle d’opérateur virtuel.

On aborde enfin un cas d’étude d’un candidat à devenir opérateur de réseau mobile virtuel qui souhaite répondre à la demande transnationale des grandes entreprises. Ce type d’opérateur virtuel est encore inexistant de nos jours.

Enfin, nous terminons par une étude comparée de la situation des opérateurs mobiles virtuels à travers l’Union Européenne.

Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished

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Sivagnanasundaram, Suthaharan. "GSM mobility management using an intelligent network platform." Thesis, Queen Mary, University of London, 1997. http://qmro.qmul.ac.uk/xmlui/handle/123456789/3820.

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Aniruddhan, Sankaran. "A fast-locking frequency synthesizer for GSM base-stations in 180nm CMOS /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5952.

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Blood, Alan Physics Faculty of Science UNSW. "Biological effects of GSM mobile phone microwave radiation: an investigation of gene expression." Awarded by:University of New South Wales. School of Physics, 2005. http://handle.unsw.edu.au/1959.4/22071.

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There is evidence that athermal radiofrequency radiation can alter Heat Shock Protein (HSP) expression or protein phosphorylation, or alter MAP kinase signalling. Effects of long-term exposure in brain tissue due to repeated HSP perturbation (eg an inhibition of apoptosis) have been hypothesised (French et al, 2001). This study aimed to investigate the RNA expression profile (12,000 genes) and HSP family protein expression levels after either acute 1-hour or chronic 4-day intermittent exposures to simulated GSM radiation in a human primary fibroblast model. The results found minimal or no effects of GSM. Flasks were exposed to 900 MHz (217 Hz modulation) at 0.18 W/kg SAR within a Transverse Electromagnetic Mode chamber (TEM cell). Cultures rested for 2 hours before exposures. Affymetrix U95A microarray analysis of a single pilot set of experiments showed that about 40 genes were reported as upregulated >=2.5 fold in each condition. There was no evidence of altered expression of any MAPK-associated genes. Target genes reported in both conditions (CBFA2T1, ZNF148, ITGA1), and genes altered in one condition (CCS, PLEC1, BIRC5), and marginally altered HSP72 were selected for PCR analysis. No other members of the HSP family were altered. In three replicate experiments assayed by real-time PCR, six genes were either unchanged or showed randomly variable expression. However HSP72 RNA showed possible consistent slight upregulation of 1.37 +/- 0.21 in the chronic condition. Western immunoblots of HSP-60, -70, -72 and -V90 proteins showed no significant changes 5 hours after exposure. In preliminary studies using a serum starvation protocol, ERK-1 phosphorylation was unaltered after 5 or 30 minutes GSM (single experiments). When flasks were transiently cooled, ERK-1 phosphorylation was increased 20 minutes later, indicating a source of artefact in some protocols. An inflammatory challenge experiment with a low-dose of the cytokine IL-1???? found that acute GSM exposure post-challenge inhibited NF????B-mediated GRO???? induction by 1.5 fold (2 experiments). Preconditioning with mild heat induces transient inhibition of both NF????B signalling and apoptosis. Other studies indicate that EMF exposures similarly evoke cytoprotection. It is suggested that GSM evoked cytoprotective signalling in this inflammatory model.

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Ferreira, Fábio Miguel Lopes. "Controlo de sistemas M2M com fotografias georreferenciadas." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/7644.

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Mestrado em Engenharia Electrónica e Telecomunicações
Com esta dissertação pretende-se estudar e projectar um sistema de controlo e comunicação Machine to Machine que monitorize elementos móveis, por recurso a comunicações via GSM/UMTS (Global System for Mobile Communications/Universal Mobile Telecommunications System). A ideia do projecto é monitorizar e recolher informação telemática de um veículo utilizando a rede GSM/UMTS. As informações colectadas são, as coordenadas GPS, e informações referentes à antena GSM à qual o dispositivo se encontra ligado, assim como a recolha de fotografias. O dispositivo criado permite assim a georreferenciação fotográfica, sendo um excelente método para segurança e monitorização remota.
This dissertation's concern is the study and design of a system for control and communication Machine to Machine for mobile elements monitorization, communicating by GSM / UMTS (Global System for Mobile Communications / Universal Mobile Telecommunications System). The project goal is to collect and monitorize a vehicle's telematic information using the GSM / UMTS. The collected information consists of the GPS coordinates and information about the GSM antenna to which the device is connected, as well as a collection of photographs. Hence, the created device allows for photographic geo-reference, which is a reliable solution for both security and remote monitorization.

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Al-Hassani, Kassim Mohammed. "Performance measurements and analysis of the existing wireless communication technology in Iraq." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/9271.

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Iraq may be considered as the largest wireless market in the Gulf region. A key driving factor in the market of wireless communication, it has seen enormous growth in the mobile phone market over the last five years leading to almost 24 million subscribers in 2011. Moreover, there are several technologies and services working in Iraq; three GSM Operators, three CDMA national operators and three CDMA provinces operators. The recent growth in the mobile phone market is based on the Global System for Mobile (GSM) communications and Code Division Multiple Access (CDMA) standards creating the next-generation wireless technologies in the Iraqi Wireless Communication market. One of the essential issues of this research is to investigate the performance of the decreased Quality Of Service (QoS) caused by interferences in the services on GSM/CDMA operators in Iraq. Many issues should be studied and taken into consideration, such as; does the Multi-Coalition Forces cause the interferences, jamming, higher rate of calls drop and false ringing; or are they caused by bad design and planning? Do we need to optimise our network due to the large number of users? All these factors are investigated and the measurements of most service providers and government agencies will be gathered. A detailed analysis was included from the providers with measurements of performance and the reasons for the deterioration of wireless services. The novel contributions of this thesis is the extensive radio measurement campaign over the three mobile an CDMA operator networks and the analysis and recommendations that were drawn to suggest the best approach to improve the QoS of Wireless communication technologies. Awareness of actual reasons behind the deterioration of services will be raised to the Iraqi Government, CMC and the wireless service providers.

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Iraba, Marie Louise. "Inexpensive mobile technologies to empower rural farmers with m-agriculture." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_9526_1370595447.

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Market information and established communication between seller and buyer play an important role in business activities. This thesis investigates the Transkei area in the Eastern Cape
Province, South Africa to find out how to empower rural farmers by providing them with less-expensive mobile technology enabling them to post and advertise their produce, access market
information on a common database, and find and communicate with potential customers. The farmers&rsquo
requirements were identified using quantitative and qualitative methods and a prototype
consisting of USSD and web applications was developed. It allows the farmer to follow a sequence of menu commands to send a request to the database and access market information, such
as commodity prices, and post information about their own produce so as to attract more customers. The low cost of USSD and the ubiquity of mobile phones enable the system to be usable, affordable and effective. During the final stage of development, the system was tested successfully and addressed a major problem faced by farmers, i.e. lack of access to market information.

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Butkus, Kazimieras. "Objektų vietos nustatymo technologinių paklaidų įvertinimo sistema." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080128_104821-95531.

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Šis darbas tiria objetų vietos nustatymo paklaidų problemą bevieliuose tinkluose ir leidžia jas įvertinti įvairiais aspektais. Įvertinimo rezultatas pateikiamas kaip sugeneruotas geografinis žemėlapis bei tekstinės reikšmės. Sistema sukurta taip, kad nepriklausytų nuo bevielių ryšių technologijos, o duomenų analizės rezulate sistema leidžia juos peržiūrėti valdant geografinę padėtį bei tikslumą. Ši sistema naudojama realiose aplikacijose, pavyzdžiui, MSC MPS R5 LBS, MPS112 platformoje, taip pat „Bitės tinklo padengimo žemėlapiai“ sprendime. Sistemos veikimas yra universalus ir ji gali būti naudojama įvairiose komercinėse tinklų planavimo ar LBS platformose. Sistema nepriklauso nuo bevielės technologijos ypatumų ir bus tinkama naudoti ateities bevielių tinklų įvertinimui.
This work investigates problem of positioning calculation error in mobile cellular networks and provides means to evaluate the errors in variuos aspects. Evaluation results are presented as generated geographical maps and values. The positioning calculation error evaluation is then used to extract requirements for engineered system. System is engineered in a way that it is cellular technology independand and is not limited by generations or carrier technologies of particular investigated networks. Resulting system allows users to select geographical area and precision of analysis to be carried on positioning calculation error. Radio signal propagation and coverage estimation algorithms are used to interpret input data and GIS data is used together to provide visual interpretation for positioning calculation error. This system is beeing used in real word aplications. At the time the system is used in MSC MPS R5 LBS, MPS112 platforms, also in solution „Bitės tinklo padengimo žemėlapiai“. Solution is universal, it can be used in variuos commercial network planning and LBS platforms. The system is cellular network technology neutral and it will be possible to evaluate future cellular or wireless networks as well.

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Mendes, Luís Miguel Vinhas. "Measurements and analysis of spectrum activity." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7725.

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Mestrado em Engenharia Electrónica e Telecomunicações
The dissertation deals with measuring and analyzing spectrum occupancy of a GSM900 band, DCS1800 band and all UMTS bandwidth. A modelization for analog power and binary quantized power is given. In the case of analog power, histograms of the power distribution during one working day are presented. In the case of quantized power the two time statistics, the time period of opportunities distribution and the time between opportunities distribution are presented, described and modeled. The measurement setup is standing in line of sight with the base station. Also, in terms of maximum sensitivity the measurement setup is described and analyzed. Spectrum non occupancy in terms of total time for the GSM900 band and the DCS1800 band is given, for a working day.
Nesta dissertação são feitas medidas e a análise de ocupação de espectro em uma banda de GSM900, uma banda de DCS1800 e toda a largura de banda do UMTS. É apresentada uma modelização para potência analógica e para a potência binária quantizada. No caso da potência analógica são apresentados histogramas da distribuição de potência ao longo de um dia útil. No caso da potência quantizada as duas estatísticas, distribuição do período de tempo de oportunidades e distribuição do tempo entre oportunidades, são apresentadas, descritas e modeladas. O setup de medida encontra-se em linha de vista com a estação base. O setup é descrito e analisado em termos de máxima sensibilidade. A desocupação de espectro em termos de tempo total para a banda de GSM900 e para a banda DCS1800 é fornecida, para um dia de útil.

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Campacci, Rodrigo Bellotto. "Handover vertical em redes NGN: integrando a sinalização do domínio de comutação de circuitos e o IMS." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-15092008-152814/.

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Este trabalho visa estudar e implementar a integração entre o domínio de comutação de circuitos e o IP Multimedia Subsystem (IMS) para suportar handovers verticais, ou seja, entre redes de acesso distintas, por exemplo, Global System for Mobile communications (GSM) e WiFi, em especial no Serviço Voice Call Continuity (VCC). Entretanto muito pouco é especificado sobre a integração entre os domínios nas normas das diversas entidades de padronização que tratam sobre o assunto. Assim, apresenta-se uma proposta para essa integração, criando-se uma nova entidade funcional para realizá-la, o Call Data Storage Function (CDSF), que interage com os demais módulos do Serviço VCC e garante que algumas informações que devem ser trocadas entre os módulos não sejam perdidas, devido à conversão de protocolos de sinalização na interface entre tais domínios. O CDSF auxilia também no controle da alocação de endereços de referência utilizados no encaminhamento de chamadas de um domínio para o outro. São definidos os protocolos de acesso ao CDSF, bem como os métodos disponíveis. Em sua concepção, recorre-se a uma modelagem modular, que permite futuras melhorias, apenas por troca de módulos. Como estudos de caso para validar a proposta são apresentados cenários de chamadas que utilizam o Serviço VCC, passando pelo CDSF. Por fim, conclui-se que a integração entre os domínios é viável se a proposta deste trabalho for utilizada. Também se demonstra que a separação dos planos de controle dos planos de dados (de usuário) é uma das contribuições fundamentais da arquitetura NGN para o sucesso de suas implementações, como por exemplo o IMS.Além disso, destacam-se as vantagens que o Serviço VCC pode agregar ao IMS, contribuindo para sua adesão em menor prazo pelas operadoras de telecomunicações, dado que esse serviço contribui para a integração de redes, cada vez mais convergentes, agregando mobilidade e continuidade à sua utilização.
This work intends to study and implement the integration between the circuit switching domain and the IP Multimedia Subsystem (IMS) to support vertical handovers that are between different access networks, such as Global System for Mobile communications (GSM) and WiFi. Therefore the specifications are incomplete about this topic in standards from the entities who works with this subject. Then, is presented a new proposal for this integration: a new functional entity to realize this integration: the Call Data Storage Function (CDSF), which interacts with other modules of VCC Service and guarantees that some information shared between modules are not lost, due to conversion of signalling protocols in the interface between domains. Besides that, CDSF helps in the control of allocation of reference address that are used to route calls from one domain to another. Access protocols to CDSF are defined and CDSF methods are exposed. The CDSF design uses a modular approach, which allows future improvements, just changing modules. As case studies to validate this work proposal, call scenarios are presented that uses the VCC Service, using CDSF. Finally, it is concluded that the integration between domains is viable if this work proposal is used. It is presented, as well, that the separation between control plans and data plans is one of the main contributions of NGN architecture to the success of its implementations, like IMS. Furthermore, it is exposed the advantages that VCC Service can aggregate to IMS, contributing for more rapidly adoption by telecommunications operators, considering that this service helps the networks integration, adding convergence, mobility and continuity.

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Viljoen, Johannes Henning. "Modelling and optimal control of the market of a telecommunications operator." Diss., Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-09152004-100823.

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Vahid, Seiamak. "Location management and network architecture design for GSM." Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/843386/.

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Recent years have witnessed a tremendous growth of research and development to provide mobile users with "seamless" communication through wireless media. Service provision in mobile networks is closely intertwined with network mobility management and therefore efficient management of subscriber mobility remains a challenging and an important area of research. This thesis examines management of signalling traffic in mobile networks and packet network design approaches, with specific contributions relating to i) reduction of network database signalling costs in GSM; ii) minimization of mobility signalling over the air-interface based a new technique for subscriber location management; iii) an efficient network design technique for packet communication networks with application to GPRS, based on a novel hybrid GA-Heuristic approach. A novel location management technique is proposed to reduce signalling costs in the core network, by reducing the rate of HLR-related transactions. By intelligent distribution of the HLR related signalling over a number of VLRs, the HLR is prevented from being a potential bottleneck and a single point of failure in the signalling network. Based on the analytical model developed, it is demonstrated that within the call-to-mobility range considered, the total network signalling cost as well as location management costs can be significantly reduced, compared to current strategy adopted in GSM, To address location management signalling in the access network, a number of dynamic schemes are considered and compared with the proposed adaptive multilayer technique. Through detailed simulations under various scenarios, the superiority of the proposed scheme, in terms of significant savings in the total signalling traffic (i.e. location update and paging) and ease of implementation, compared to other techniques is demonstrated . The location management scheme of GSM is used as baseline for comparisons. Finally, efficient design of packet communication networks, with application to GPRS backbone architecture, is addressed. To meet the cost and traffic requirements whilst ensuring that the delay and reliability constraints are also satisfied, a hybrid GA-heuristic approach is developed as an alternative to purely GA based and heuristic-only approaches. Under a common set of parameters, the performance of various techniques are compared and it is shown that the hybrid approach is capable of producing solutions that are superior to other typical network design methods.

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Kruger, Pieter Jan Harm. "Cellphone banking at the bottom of the pyramid." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/19975.

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Thesis (MSc)--Stellenbosch University, 2012.
ENGLISH ABSTRACT: This thesis investigate the di erent available GSM bearer channels that can be used to launch a cellphone banking application. Speci c attention is given to launch such a cellphone banking application to the so called \bottom of the pyramid". In South Africa, there are an estimate 11 to 13 million people with no bank accounts. The cellphone create an ideal opportunity to be used as a tool to reach this untapped market segment that today mainly uses cash to pay for day to day living expenses. The thesis provide more information on the cellphone banking arena in South Africa as well as certain projects in other parts of the world. The thesis also highlight new devel- opments on cellphone technology that include Android and IPhone delivery channels. Focus is placed on how the cellphone banking presentation layer must be delivered through the USSD GSM bearer channel. USSD is at the current moment the ultimate channel to consider due to its extensive reach and ability to work on any GSM cellphone handset. In conclusion, although cellphone banking can be used by any person, the bene t to bring nancial services to the bottom end of the pyramid must be considered to achieve nancial inclusion. The cellphone due to its reach is the ideal medium to access this lower end market.
AFRIKAANSE OPSOMMING: Hierdie tesis ondersoek beskikbare GSM selfoon kanale wat gebruik kan word om 'n selfoon bankdienste toepassing te initieer. Spesi eke aandag word gegee om so 'n selfoon bankdienste toepassing uit te rol na die sogenaamde onderste gedeelte van die bevolkings piramiede. Die tesis verskaf meer informasie oor die selfoon bankdienste arena in Suid Africa maar dit brei ook ooit oor sekere soortgelyke projekte in ander dele van die wereld. Die tesis lig ook nuwe ontwikkelings uit in selfoon tegnologie wat Android en IPhone mediums insluit. Fokus word geplaas op die selfoon bankdienste vertoning deur die USSD GSM kanaal. USSD is huidiglik die beste kanaal om te oorweeg as gevolg van die wydverspreide beskik- baarheid omdat die tegnologie op enige selfoon handstuk werk. Die uiteindelike gevolgtrekking uit die werkstuk is dat selfoon bankdienste deur enige persoon gebruik kan word, maar selfoon bankdienste is 'n goeie idee om te oorweeg om mense in te sluit uit die onderste gedeelte van die bevolkings piramiede. Die selfoon kan dus as 'n ideale medium gebruik word om hierdie mense te betrek by nansiele dienste.

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Hraga, Hmeda I. "Modelling and design of compact wideband and ultra-wideband antennas for wireless communications. Simulation and measurement of planer inverted F antennas (PIFAs) for contemporary mobile terminal applications, and investigations of frequency range and radiation performance of UWB antennas with design optimisation using parametric studies." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/5668.

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The rapidly growing demand for UWB as high data rates wireless communications technology, since the Federal Communications Commission (FCC) allocated the bandwidth of UWB from 3.1GHz to 10.6 GHz. Antenna also plays an essential role in UWB system. However, there are some difficulties in designing UWB antenna as compared to narrowband antenna. The primary requirement of UWB antennas is be able to operate over frequencies released by the FCC. Moreover, the satisfaction of radiation properties and good time domain performance over the entire frequency range are also necessary. In this thesis, designing and analysing printed crescent shape monopole antenna, Planar Inverted F-L Antenna (PIFLA) and Planar Inverted FF Antenna (PIFFA) are focused. A Planar Inverted FF Antenna (PIFFA) can be created to reduce the potential for interference between a UWB system and other communications protocols by using spiral slot. The antennas exhibits broadside directional pattern. The performances such as return loss, radiation pattern and current distribution of the UWB antennas are extensively investigated and carried out. All the results have been demonstrated using simulation and experimentally whereby all results satisfy the performance under - 10dB point in the bandwidth of UWB. In addition the miniaturization of MIMO/diversity Planar Inverted-F antenna (PIFA) which is suitable for pattern diversity in UWB applications is presented. This antenna assembly is formed by two identical PIFAs, a T-shaped decoupling structure which connects the two PIFAs and a finite ground plane with a total compact envelope dimension of 50 ¿ 90 ¿ 7.5mm3. The radiation performance of the proposed MIMO antenna was quite encouraging and provided an acceptable agreement between the computed and measured envelope correlation coefficient and channel capacity loss.
General Secretariat of Education and Scientific Research Libya

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Hraga, Hmeda Ibrahim. "Modelling and design of compact wideband and ultra-wideband antennas for wireless communications : simulation and measurement of planer inverted F antennas (PIFAs) for contemporary mobile terminal applications, and investigations of frequency range and radiation performance of UWB antennas with design optimisation using parametric studies." Thesis, University of Bradford, 2013. http://hdl.handle.net/10454/5668.

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The rapidly growing demand for UWB as high data rates wireless communications technology, since the Federal Communications Commission (FCC) allocated the bandwidth of UWB from 3.1GHz to 10.6 GHz. Antenna also plays an essential role in UWB system. However, there are some difficulties in designing UWB antenna as compared to narrowband antenna. The primary requirement of UWB antennas is be able to operate over frequencies released by the FCC. Moreover, the satisfaction of radiation properties and good time domain performance over the entire frequency range are also necessary. In this thesis, designing and analysing printed crescent shape monopole antenna, Planar Inverted F-L Antenna (PIFLA) and Planar Inverted FF Antenna (PIFFA) are focused. A Planar Inverted FF Antenna (PIFFA) can be created to reduce the potential for interference between a UWB system and other communications protocols by using spiral slot. The antennas exhibits broadside directional pattern. The performances such as return loss, radiation pattern and current distribution of the UWB antennas are extensively investigated and carried out. All the results have been demonstrated using simulation and experimentally whereby all results satisfy the performance under - 10dB point in the bandwidth of UWB. In addition the miniaturization of MIMO/diversity Planar Inverted-F antenna (PIFA) which is suitable for pattern diversity in UWB applications is presented. This antenna assembly is formed by two identical PIFAs, a T-shaped decoupling structure which connects the two PIFAs and a finite ground plane with a total compact envelope dimension of 50 x 90 x 7.5mm³. The radiation performance of the proposed MIMO antenna was quite encouraging and provided an acceptable agreement between the computed and measured envelope correlation coefficient and channel capacity loss.

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Prince, Castro Jonathan Castro Jonathan Prince. "A global satellite system for mobile communications /." [S.l.] : [s.n.], 1995. http://library.epfl.ch/theses/?nr=1300.

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Haney, Timothy N. "Generation of Global System for Mobile (GSM) signals and their Time Difference of Arrival (TDOA) estimation." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA381073.

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Thesis (M.S. in Electircal Engineering) Naval Postgraduate School, June 2000.
"June 2000." Thesis advisor(s): Hippenstiel, Ralph ; Ha, Tri T. Includes bibliographical references (p. 77-78). Also available online.

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Lee, See Taur. "Quad-band global system for mobile communications complementary metal-oxide-semiconductor transmitter /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6122.

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Chan, Ka Chun. "A dual channel location estimation system for mobile computing." HKBU Institutional Repository, 2003. http://repository.hkbu.edu.hk/etd_ra/445.

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McAbee, Carson C. "Software-defined radio global system for mobile communications transmitter development for heterogeneous network vulnerability testing." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/38978.

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Approved for public release; distribution is unlimited.
The conversion from homogeneous global system for mobile communications (GSM) networks to heterogeneous GSM/universal mobile telecommunications system (UMTS) networks is rapidly expanding. Previous research identified vulnerabilities in the GSM network that were fixed in the UMTS standard; however, the mobile device must successfully access the UMTS network to take advantage of security improvements. Therefore, a possible vulnerability not addressed in either the GSM or UMTS standards is the potential for a malicious entity to prevent a mobile device from handing over from a GSM to UMTS network, because the GSM network maintains the stand-alone dedicated control channel (SDCCH) uplink time slots. The process of testing this vulnerability requires the development of a device that monitors a GSM base transceiver station, identifies when a handover to UMTS message is sent, tracks the time slots of the SDCCH uplink, and transmits a GSM handover-failure message. In this thesis, we present an open-source coding scheme that utilizes parts of the OpenBTS source code to transmit a GSM handover-failure message using the universal software radio peripheral. The method is validated through the collection of the GSM transmitter messages by Airprobes GSM-receiver software.

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Pozzobon, Oscar. "Secure location services : vulnerability analysis and provision of security in location systems /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18315.pdf.

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Axelsson, Karin, and Cynthia Novak. "Support for Cell Broadcast as Global Emergency Alert System." Thesis, Linköping University, Department of Science and Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9491.

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Cell Broadcast (CB) is a possible technical realisation of a global emergency alert system. It is a technique used for sending short text messages to all mobile stations (MSs) in a defined geographical area. An potential effect of using CB is the increase in battery consumption of the MS due to the fact that an extra channel has to be used to make the service available even when the network is otherwise congested. Another part of the service which leads to a potential problem is making CB messages available in different languages. Investigating these problems is the objective of this thesis and the studies it includes. During the first part of the thesis, we measured the battery consumption of MSs in different modes of operation in order to analyse how CB affects the amount of current drained. The tests showed that battery consumption increased only slightly when CB messages were being received at the MS. Although some of the results can be, and are, discussed, we believe that CB would have a small effect on the power consumption of an MS, particularly in a context where it would be used for emergency warning messages only. This mentioned, it would however be wishful to confirm the conclusions further through the realisation of long-term testing. The second part of the thesis deals with the investigation of the MSs’ support for CB messages with different coding schemes. Based on the investigation’s result, we have come to the conclusion that in the long term the usage of different coding schemes on the same channel is preferred. However, the usage of one, global, emergency channel is hard to realise since that requires a standardisation between all countries. In our opinion this may be achieved first in the long run and until then, the usage of separate channels seems to be necessary.

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Hill, Ryan Tebbutt. "Adaptive interfaces for mobile preference-based searching." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1248.

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Today's mobile computing devices provide a convenient means to search for points-of-interest (POIs) such as restaurants and accommodation. Mobile Preference-Based Search Tools (PBSTs) allow users to identify POIs such as restaurants or accommodation most suited to their needs and constraints using a mobile device. These devices however, have several design constraints including limited screen space and hardware capabilities. Adaptive User Interfaces (AUIs) have been proposed to address these issues but have not been extensively applied to mobile PBSTs such as mobile tourist guides. In addition, AUIs possess several benefits and advantages over static (traditional) interfaces, which do not take a user's preferences, skill set and experience into account. Little research, however, has been conducted into identifying the potential benefits of AUIs for mobile preference-based searching (PBS). The aim of this research was to determine the extent to which an AUI could improve the effectiveness and user satisfaction of mobile PBS. A literature study was conducted to determine the benefits and limitations of existing mobile PBSTs and determine how these could be improved. The potential benefits of AUIs for mobile PBSTs and a mobile map-based visualisation system were identified. A suitable model for incorporating an AUI into a mobile PBST was identified. The requirements for a mobile PBST were combined with the potentially adaptable objects of a Mobile Map-based Visualisation (MMV) system to provide adaptation suggestions for POInter, an existing mobile tourist guide. A field study using POInter was conducted in order to measure the extent to which participants agreed with suggestions provided for adapting the information, interaction and visualisation aspects of the system. These results were used to derive adaptation requirements for A-POInter, an adaptive version of POInter. Using a model-based design approach, an AUI was designed and implemented for A-POInter. An extensive field study was then conducted to evaluate the usability of the adaptations provided by A-POInter. The quantitative and qualitative data collected from the evaluations allowed the usability of A-POInter to be determined. The results of the field study showed that the participants were highly satisfied with the usability and the usefulness of the adaptations provided by A-POInter. Conclusions and recommendations for future work based on the results of the research were then outlined to conclude the dissertation.

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Chu, Man Kin. "A hybrid approach for mobile location estimation in cellular radio networks." HKBU Institutional Repository, 2006. http://repository.hkbu.edu.hk/etd_ra/672.

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Liu, Tuo. "Analytical modeling of HSUPA-enabled UMTS networks for capacity planning." Connect to full text, 2008. http://ses.library.usyd.edu.au/handle/2123/4055.

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Thesis (Ph. D.)--University of Sydney, 2009.
Title from title screen (viewed February 20, 2009). Includes graphs and tables. Includes list of publications co-authored with others. Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Information Technologies, Faculty of Engineering and Information Technologies. Degree awarded 2009; thesis submitted 2008. Includes bibliographical references. Also available in print form.

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Van, der Walt Tjaart. "The management and implementation of a data terminal project on a global system for mobile communications / Tjaart van der Walt." Thesis, Potchefstroom University for Christian Higher Education, 1999. http://hdl.handle.net/10394/9613.

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With the demand for more control over remote systems and access to remote data increasing, there existed the need for a more efficient and low cost means of transmitting this data. Traditionally, small telemetry data packets have been transmitted using unreliable direct radio frequency links, or expensive copper connections or satellite communications. With the international infrastructure of the Global System for Mobile communication (GSM) networks and it's ever-improving coverage, GSM has become a viable solution as the data channel for data telemetry. With a data terminal, remote monitoring of processes in a factory plant with real-time access to the parameters will be possible. If the per-unit cost is low enough, there would be a use for it in pre-paid energy metering, or even in the control of peak energy demand. The goal of this project was twofold: firstly to apply a structured project management approach to the design cycle of a data terminal, and secondly to design such a terminal in the shortest possible time. It was anticipated that the use of a structured management process would reduce the development time. The data terminal was not designed for a specific customer, but was to be as versatile and flexible as possible. It is understood that only a percentage of all telemetry applications will be able to use such a device, and the trade-off was to balance the cost of the unit (and functionality) with too much complexity. The project was completed in a relatively short time, and the terminal found to be extremely flexible. The unit cost was kept low as compared to other systems. In fact, the complete unit will cost the end user less than just the communication devices in the trunk radio and satellite systems it can replace. The short message service (SMS) as a communication channel has proven itself to be more reliable and of lower cost than other competing technologies. The ongoing expansion and improvement of the GSM networks by their operators, also ensure a stable platform for future use of the data terminal.
Thesis (MIng (Electrical Engineering))--PU for CHE, 1999

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Madebwe, Charles. "An investigation into the role played by perceived security concerns in the adoption of mobile money services : a Zimbabwean case study." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017933.

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The ubiquitous nature of mobile phones and their popularity has led to opportunistic value added services (VAS), such as mobile money, riding on this phenomenon to be implemented. Several studies have been done to find factors that influence the adoption of mobile money and other information systems. The thesis looks at factors determining the uptake of mobile money over cellular networks with a special emphasis on aspects relating to perceived security even though other factors namely perceived usefulness, perceived ease of use, perceived trust and perceived cost were also looked at. The research further looks at the security threats introduced to mobile money by virtue of the nature, architecture, standards and protocols of Global System for Mobile Communications (GSM). The model employed for this research was the Technology Acceptance Model (TAM). Literature review was done on the security of GSM. Data was collected from a sample population around Harare, Zimbabwe using physical questionnaires. Statistical tests were performed on the collected data to find the significance of each construct to mobile money adoption. The research has found positive correlation between perceived security concerns and the adoption of money mobile money services over cellular networks. Perceived usefulness was found to be the most important factor in the adoption of mobile money. The research also found that customers need to trust the network service provider and the systems in use for them to adopt mobile money. Other factors driving consumer adoption were found to be perceived ease of use and perceived cost. The findings show that players who intend to introduce mobile money should strive to offer secure and useful systems that are trustworthy without making the service expensive or difficult to use. Literature review done showed that there is a possibility of compromising mobile money transactions done over GSM

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Maharaj, Robin. "Design of asset tracking device with GPRS Interface." Thesis, Cape Peninsula University of Technology, 2019. http://hdl.handle.net/20.500.11838/2815.

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Thesis (Master of Engineering in Electrical Engineering)--Cape Peninsula University of Technology, 2018.
IOT devices have the potential to improve asset lifecycle optimization because of their ability to provide relevant real time data to high level applications. This data with minimal latency can assist asset managers to control the behaviour of assets and asset users to optimize asset lifecycle cost. There are many environments that require asset tracking devices but this design focussed on motor vehicles with auxiliary functions and apparatus. This research work documented the design of an asset tracking device built and tested on a 32.bit microcontroller platform with built-in CAN peripheral. This design resolved handling multiple serial interfaces collating data simultaneously concatenating this data and transmitting the data via GPRS interface as a single UDP sentence. Apart from interfacing various serial interfaces to the Stm24f4 this design also implemented a Wireless module as well as a multichannel ADC Module. This design was accomplished by researching and implementing software techniques as well as researching the hardware/firmware in terms of DMA and Nested Vector Interrupt Controller of the STM32 devices. The solution that this design will accomplish is to provide the industry an asset-tracking device with data capturing functionality capable of delivering the above needs at reasonable data cost. The device designed in this thesis is the client device of asset tracking network. This design was accomplished on a proof of concept basis delivering built hardware in the form of various application modules interfaced to a 32 –bit microcontroller via uart, SPI and CAN.

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Nehme, Rimma V. "Continuous query processing on spatio-temporal data streams." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-082305-154035/.

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Cardoza, Andrew Robert. "Middleware for the SUNSAT field station." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52338.

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Thesis (MEng)--University of Stellenbosch, 2001.
ENGLISH ABSTRACT: SRMA currently used on the SUNSAT field station is an effective MAC layer protocol but lacks several features. Sufficient support for flexible communication, acknowledgement of individual data packets, simultaneous communication of multiple instances from a higher layer over a single underlying layer, and a robust FTP procedure to transfer large amounts of data are some of the features that the SUNSA T field station should cater for. ORBCOMM, GSM and WAP implementations are discussed. Some features from these implementations that are useful in the LEO communication environment are designed into an additional layer of software. This additional layer, called middleware, is proposed and uses SRMA services to deliver store-and-forward services. It supports high volumes of short transactions and session suspend and resume facilities between the SUNSA T satellite and field station. Keywords: SUNSAT, Communication, Field station, WAP, GSM, ORBCOMM
AFRIKAANSE OPSOMMING: Die SRMA pakketkommunikasie-protokol op SUNSA T se prototipe grondterminaal is voldoende om die oordrag van boodskappe oor die kommunikasieverbinding te reguleer. Dit is onvoldoende om fasiliteite soos kommunikasie van 'n aantal instansies in 'n hoër kommunikasie laag oor 'n enkele laer laag en om 'n robuuste data oordrag protokol vir groot hoeveelhede data van 'n grondterminaal te ondersteun. ORBCOMM, GSM en WAP stelsel toepassings word bespreek. Resultate wat spruit uit die drie toepassings word gebruik om kommunikasie in 'n lae wentelbaan kommunikasie omgewing te bevorder. 'n Bykomende sagteware laag, bekend as middle-ware, word aanbeveel om voorafgenoemde funksionaliteit mee te implimenteer. Die middle-ware gebruik die beskikbare dienste van die SRMA pakketkommunikasie-protokol om toegang te verkry na die kommunikasie kanaal. Sodoende kan hoë volumes kort transaksies, en sessie-stop en hervat fasiliteite 'n werklikheid gemaak word. Sleutelwoord: SUNS AT, Kommunikasie, grondterminaal, WAP, GSM, ORBCOMM

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Van, Graan Sebastiaan Jan. "Network configuration improvement and design aid using artificial intelligence." Pretoria : [s.n.], 2007. http://upetd.up.ac.za/thesis/available/etd-08292008-170524/.

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Jenkins, William George. "Real-time vehicle performance monitoring with data integrity." Master's thesis, Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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Cesário, Júnior José Maria 1979. "Um medidor de energia elétrica integrado em redes de comunicações." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267697.

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Orientadores: Varese Salvador Timóteo, Francisco José Arnold
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Tecnologia
Made available in DSpace on 2018-08-24T09:10:01Z (GMT). No. of bitstreams: 1 CesarioJunior_JoseMaria_M.pdf: 2596300 bytes, checksum: 6b11eb547957a0632bbc647946da04ce (MD5) Previous issue date: 2014
Resumo: A crescente evolução mundial dos sistemas de medição inteligentes, a liberação de regulamentações Brasileiras, incentivando a adoção de sistemas de medição de energia elétrica inteligentes, direcionaram a presente dissertação a propor um sistema composto de um equipamento eletrônico para medição, em tempo real, das grandezas de corrente, tensão e calcular a energia consumida e terá canais de comunicação com as tecnologias Wi-Fi, GSM/GPRS e GPS. As informações sobre consumo serão disponibilizadas para os usuários finais com o objetivo de mudar o padrão de consumo de energia elétrica, ou até reduzi-lo, através da conscientização e disponibilização das informações de consumo em tempo real
Abstract: The growing worldwide trend of smart metering systems, the release of Brazilian regulations, encouraging the adoption of smart electricity metering systems, guided this dissertation to propose a system composed of an electronic device for measuring, in real time, the magnitudes of current, voltage and calculate the consumed power and will have communication channels based on Wi-Fi, GSM /GPRS and GPS technologies. The consumption information will be made available to end users with the goal of changing the electricity consumption pattern, or even reduce it, through awareness and provision of consumer information in real time
Mestrado
Tecnologia e Inovação
Mestre em Tecnologia

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Berrios-Ayala, Mark. "Brave New World Reloaded: Advocating for Basic Constitutional Search Protections to Apply to Cell Phones from Eavesdropping and Tracking by Government and Corporate Entities." Honors in the Major Thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETH/id/1547.

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Imagine a world where someone’s personal information is constantly compromised, where federal government entities AKA Big Brother always knows what anyone is Googling, who an individual is texting, and their emoticons on Twitter. Government entities have been doing this for years; they never cared if they were breaking the law or their moral compass of human dignity. Every day the Federal government blatantly siphons data with programs from the original ECHELON to the new series like PRISM and Xkeyscore so they can keep their tabs on issues that are none of their business; namely, the personal lives of millions. Our allies are taking note; some are learning our bad habits, from Government Communications Headquarters’ (GCHQ) mass shadowing sharing plan to America’s Russian inspiration, SORM. Some countries are following the United States’ poster child pose of a Brave New World like order of global events. Others like Germany are showing their resolve in their disdain for the rise of tyranny. Soon, these new found surveillance troubles will test the resolve of the American Constitution and its nation’s strong love and tradition of liberty. Courts are currently at work to resolve how current concepts of liberty and privacy apply to the current conditions facing the privacy of society. It remains to be determined how liberty will be affected as well; liberty for the United States of America, for the European Union, the Russian Federation and for the people of the World in regards to the extent of privacy in today’s blurred privacy expectations.
B.S.
Bachelors
Health and Public Affairs
Legal Studies

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Qian, Hua 1982. "API : GSM/GPRS modem user interface / by." 2007. http://proquest.umi.com/pqdweb?did=1421621571&sid=8&Fmt=2&clientId=10361&RQT=309&VName=PQD.

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Hou, Ching-Shiow, and 侯青秀. "Adaptive Blind Maximum-Likelihood Equalizer for Global System Mobile Communication(GSM)." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/31319443437325952763.

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碩士
義守大學
電機工程學系
88
In the project, a blind equalization by Maximum Likelihood Sequence Estimation (MLSE) is developed and investigated for the Global System Mobile Communication(GSM). The blind equalization techniques have the ability to retrieve the input data, and possibly the channel impulse response, given only the channel output without resorting to any training sequence. Many of the proposed blind techniques usually incorporate higher order statistical information of the received signal in the error criterion for channel updating. The results in hundreds and typically thousands of received symbols being proposed before the equalizer coefficients converge. It is not suitable for the time-variant channel of the GSM system. Unlike the blind equalization algorithms reported above, we consider in this project the problem of joint data and channel estimation based on Maximum Likelihood Sequence Estimation (MLSE). As we reviewed, the blind MLSE algorithm exhibits very good convergence behavior. Subsequently; the simulations with the multipath fading channel models of the mobile radio communication will be proceeded.

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Van, der Merwe Pieter Ben. "Mobile commerce over GSM a banking perspective on security /." 2003. http://upetd.up.ac.za/thesis/available/etd-07202004-111814.

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Barnard, Frederick Jacobus. "An integrated health, safety and environmental risk assessment model for the South African Global Systems Mobile Telecommunications (GSM) industry." Thesis, 2005. http://hdl.handle.net/10500/2385.

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More than one billion people, almost one in six of the world's population, are now using GSM mobile phones. The situation in South Africa is no different from that in the rest of the world. The rise of mobile telephone usage in South Africa has been driven by a combination of factors such as demand, sector reform, the licensing of new competition, and the emergence of major strategic investors, such as Vodacom and MTN. It was estimated that by March 2005 there should be approximately 20 million cellular customers in South Africa. The growth in the South African cellular market is proportionate to the potential risks in an environment where organisations are continuously seeking ways of improving efficiency, cutting costs, and staying abreast of technological advances. Elements of risk control such as Safety, Health, and Environmental Management can no longer be left out of the equation while organisations in the GSM industry are considering increasing their networks to meet the demands of growth. Although risk assessments are not specifically defined in the Occupational Health and Safety Act (85 of 1993); Section 8 does, however, stipulate under the general duties of the employer that the employer must establish, as far as is reasonably practicable, which hazards to the health or safety of persons are attached to any work which is performed. This situation has changed with the promulgation of the Construction Regulations, GNR.1010 on 18 July 2003; which state that every contractor performing construction work shall, before the commencement of any construction work and during construction work, cause a risk assessment to be performed by a competent person appointed in writing, and that the risk assessment shall form part of the health and safety plan to be applied on the site. This requirement under the Construction Regulations will have a major impact on organisations in the GSM industry. Integrated Health, Safety and Environmental risk assessments have now become a prerequisite before considering any further expansion of the GSM network in South Africa. The relationship between the operational risk sub-disciplines of health, safety, and environmental management, as part of the risk-management function, has been established, and an operational risk-assessment model for the Global Systems Mobile Telecommunications industry in South Africa that measures occupational health, safety, and environmental management risks on an integrated basis has been developed. The risk assessment model for the South African GSM industry is based on assessing the frequency of an activity in relation to the impact on the organisation's business processes, incident/accident potential, financial impact, legal status, and the nature of ecological impact.
Business Management
D. Com. (Business Management)

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Αυλωνίτης, Αθανάσιος, and Αναστάσιος Λαμπρόπουλος. "Υλοποίηση αλγορίθμου και προσομοίωση για τη βέλτιστη διαχείρηση φορητών συσκευών σε ετερογενή ασύρματα δίκτυα." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2515.

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Η διπλωματική εργασία υλοποιεί και προσομοιώνει αλγόριθμο για τη βέλτιστη διαχείριση φορητών συσκευών σε ετερογενή ασύρματα δίκτυα. Στο πρώτο κεφάλαιο γίνεται μια εισαγωγή στις γενικές αρχές των Κυτταρικών Συστημάτων Κινητών Επικοινωνιών παρουσιάζοντας την βασική ιδέα των διαφόρων γενιών κινητών επικοινωνιών. Στο δεύτερο κεφάλαιο αναλύονται τα συστήματα τρίτης γενιάς – 3G. Στο τρίτο κεφάλαιο αναφέρονται τα τεχνικά χαρακτηριστικά, τα πλεονεκτήματα και οι σχέσεις της πλατφόρμας TETRA. Στο τέταρτο κεφάλαιο περιγράφεται το σύστημα και οι λειτουργίες του TETRAPOL καθώς και τα πλεονεκτήματα και οι υπηρεσίες που προσφέρει αυτό. Στο 5ο κεφάλαιο αναλύονται τα συστατικά οι υπηρεσίες και οι λειτουργίες του iDen. Στο κεφάλαιο 6 γίνεται μια αναφορά στο πρωτόκολλο WiMax. Στα κεφάλαια 7 & 8 παρουσιάζονται ο αλγόριθμος της διαχείρισης συσκευών και η εξομοίωσή του σε MATLAB.
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Lin, Phone, and 林風. "Radio Resource Allocation for Global System for Mobile Communications." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/72233596697168664881.

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博士
國立交通大學
資訊工程系
89
Global System for Mobile Communication (GSM) provides telecommunication and data services to moving users, which is a digital cellular system developed by Group Special Mobile of Conference Europeenne des Postes et Telecommunications (CEPT) and its successor European Telecommunications Standard Institute (ETSI). To increase end user satisfaction and network quality perception, GSM is evolved to GSM phase 2+ for advanced services. These services include advanced speech services, group call and related services, General Packet Radio Service (GPRS) and Short Message Service (SMS). In GSM phase 2+, call re-establishment service is specified to allow a mobile station (MS) to resume a call in which the radio link has been temporarily interrupted due to interference or bad signal which is referred as a call interruption phenomenon. In this mechanism, if a communication channel is interrupted, the network still reserves the trunk and/or the channel for the interrupted call, and an interrupt ion timer is triggered. If the timer expires or the remote party hangs up the phone before the interrupt ion period is over, the interrupted call is actually forced terminated. Otherwise, the interrupted call is resumed by the call re-establishment service. GSM phase 2+ also provides a good compromise between the cost of the system and the quality of the services to the users. The half-rate speech codec (5.6 kbps) has been standardized to achieve this goal. The GSM half-rate speech codec can reasonably provide the same quality of service as the GSM full-rate speech codec in most cases. In GSM, the frequency carrier is divided into eight time slots per frame. Thus, mixing full- and half-rate calls in a frequency carrier results in eight full-rate calls, 16 half-rate calls, or any feasible combinations. Better frequency band utilization can be expected. Based on the GSM radio architecture, General Packet Radio Service (GPRS) provides users data connections with variable data rates and high bandwidth efficiency. In contrast to the other services (except SMS), GPRS will not permanently allocate separate radio resource of the GSM. This reduces the waste of bandwidth when bursty communications are supported over a continuous circuit. Users of GPRS benefit from shorter access times and higher data rates. Compared with the voice circuit-switched services provided by GSM, the three services mentioned above generate new type of traffic (e.g., half-rate call traffic and GPRS packet data) to occupy the radio resource. Thus, it is important to allocate the radio channels to both the new service users and the traditional service (i.e., circuit-switched voice) users in an efficient way. In this dissertation, we propose channel allocation schemes for these services. Analytical models are built to investigate the performance of the channel allocation schemes. Simulation experiments are conducted to validate the analytical model. Based on the workload to the GSM system, our studies show the performance of each scheme, which provides guidelines for radio resource allocation for GSM. Acknowledge Contents List of Figures List of Tables Notation 1 Introduction 2 Improving GSM Call Completion by Call Re-Establishment 3 Channel Assignment for GSM Half-Rate and Full-Rate Traffic 4 Channel Allocation for GPRS 5 Conclusions and Future Work

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46

Sharma, Sudeep. "On reducing call drop outs by improving Bit Error Rate performance in a GSM mobile communications system." 2008. http://hdl.handle.net/10106/923.

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47

Wu, Chen-Mao, and 吳承懋. "Automatic Frequency Tuning Loops for Global System for Mobile Communications and Instrumentation Amplifier." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/26gdk3.

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碩士
國立臺灣科技大學
電機工程系
105
Two automatic frequency tuning loops (ATL) are mentioned in the thesis. One is for channel select filters of GSM transceivers, and the other is for a chopper instrumentation amplifier (IA). The ATL for channel select filters of GSM transceivers is based on the master-slave structure. The power consumption is 6.3 mW from a 1.8-V power supply. By controlling a 4 bit cap-array, the corner frequency can be varied from 186 kHz to 322 kHz with the frequency step of 7~12 kHz. The chip area is 1.475 mm 2. The other chip is a tunable gain chopper instrumentation amplifier which employs a Sallen-Key filter to attenuate the up-converted noise at chopper frequency. The ATL for the IA is based on direct-tuning structure, where the filter is connected with the tuning circuit, than that is connected with the signal path. The power consumption is 1.1 mW from a 1.2-V power supply. The gain of the IA is from 20.7 to 48.5 dB with the minimum bandwidth of 7.5 kHz. The chopper IA can achieve up to 95 dB of common mode rejection ratio (CMRR) and power supply rejection ratio (PSRR). By using chopper technique, the input referred noise of the chopper IA can be reduced to 0.33 uVrms (0~96 kHz). By controlling a 3 bit cap-array, the corner frequency can be varied from 7.5 kHz to 14.4 kHz with the frequency step of 0.8~1.1 kHz. The chip area is 2.128 mm 2. The circuits are designed and implemented with TSMC CMOS 0.18-μm process.

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48

Vinhas, Nuno André Fontes. "Plataforma de Download de Skins UI para Apps Mobile." Master's thesis, 2014. http://hdl.handle.net/10316/35665.

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Dissertação de Mestrado em Engenharia Informática apresentada à Faculdade de Ciências e Tecnologia da Universidade de Coimbra
As operadoras de telecomunicações estão a perder um elevado número de receitas, já que os seus clientes começam a optar por soluções Over-The-Top (OTT), como o Skype, WhatsApp, Facebook ou Twitter, que oferecem melhores soluções a um custo reduzido. De forma a combater esta tendência, a Global System for Mobile Communications Association (GSMA) criou o Rich Comunication Suite (RCS) que consiste numa especificação de um conjunto de serviços - Voice Over IP (VoIP), Instant Message (IM), File Transfer (FT), entre outros - interoperáveis entre as várias redes das operadoras de telecomunicações. Várias soluções foram colocadas no mercado por diferentes operadoras, todas oferecendo um cliente de forma gratuita. Após garantirem uma sólida base de utilizadores, as operadoras vêm nestas soluções uma oportunidade de negócio. O modelo de negócio incide essencialmente na disponibilização de conteúdos de valor acrescentado aos seus utilizadores. A venda de Skins e de Stickers, por exemplo, está a ter um enorme sucesso nas aplicações OTT, tendo estas reportado receitas significativas resultantes da venda destes conteúdos. Neste relatório o autor apresenta as suas contribuições no desenvolvimento das funcionalidades de download e consumo de conteúdos de valor acrescentado nos clientes RCS da WIT Software e no cliente de messaging do grupo Vodafone intitulado de Message Plus.

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49

Batista, Miriam Raquel da Silva Mamede. "WearIoT: swearable IoT human emergency system." Master's thesis, 2018. http://hdl.handle.net/10071/18211.

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A área da saúde foi uma das muitas beneficiadas com a evolução tecnológica, dando origem a novos conceitos que visam melhorar ou mesmo prolongar a vida das pessoas. Os sistemas de monitorização vestíveis, juntamente com as comunicações sem fios, são a base de uma classe emergente de redes de sensores. Estas tecnologias de informação permitem a deteção precoce de condições anormais e ajudam na sua prevenção. O objetivo é criar um destes sistemas compostos por uma rede de sensores que é implementada numa peça de roupa através de fios condutores com sensores conectados. Em contato com o corpo humano tem a função de fazer várias leituras, e.g., temperatura corporal, pulsação, entre outras. Outro objetivo é detetar quedas do utilizador. A deteção de quedas é cada vez mais importante para o utilizador, pois é uma situação que pode colocar em risco a sua saúde. Para o desenvolvimento deste conceito, são utilizadas Comunicações Móveis e o Sistema de Posicionamento Global. A primeira é uma tecnologia que permite criar chamadas de emergência em resposta a alarmes do sistema, o segundo indica qual a sua posição geográfica. Para complementar o sistema, existe uma plataforma online que regista a posição do utilizador tal como os seus dados. Tem também uma área de alertas no qual o utilizador pode verificar os seus valores preocupantes. Em caso de emergência o sistema contacta os serviços de emergência ou em casos especiais a ajuda pode ser obtida através de um UAV.
The health area was one of the many beneficiaries of technological evolution, giving rise to new concepts that aim to improve or even prolong people’s lives. Wearable monitoring systems, along with wireless communications, form the basis of an emerging class of sensor networks. These information technologies enable the early detection of abnormal conditions and help in their prevention. The goal is to create one of these systems composed by a network of sensors that is implemented in a garment through conductive wires with connected sensors. In contact with the human body it has the function of doing several readings, e.g., body temperature, heartbeat, among others. Another goal is to detect user falls. The detection of falls is increasingly important for the user, as it is a situation that can endanger people’s health. For the development of this concept, Mobile Communications and the Global Positioning System are used. The first is a technology that allows to create emergency calls in response to system alarms, the second indicates the geographical location. To complement the system there is an online platform that registers the position of the user as well as his data. There is also an alert area in which the user can check his alarming values. In case of emergency the system contacts the emergency services or in special cases help can be obtained through an UAV.

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50

Waiyaki, Edward Chege. "Leveraging technology for business fleet applications : a case study of fleet management system implemented in Kenya Power & Lighting Company Limited." Diss., 2013. http://hdl.handle.net/10500/11883.

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This study aimed to evaluate the effectiveness of a modern fleet management system in improving the logistics of transporting staff, goods and materials in Kenya Power & Lighting Company, a utility firm in power distribution. In today’s competitive marketplace which is characterised by rapidly changing business requirements, leveraging leading edge technologies and adopting best practices are essential in order to ensure sound logistical support that guarantees both effectiveness and efficiency in the transportation processes. The sampling procedure of one-stage, cluster sampling and the use of the simple random sampling technique were used in this study to select a sample size which was sufficiently representative of the whole population. Both the descriptive study approach and the survey research strategy were adopted to enable the collection of data in a manner that allowed in-depth examination while gathering information that explained the relationships between constructs, in particular, cause and effect relationships. The main purpose of this dissertation was therefore to establish that the use of information technology is feasible in transport industries, explain possible obstacles and also any major advantages of its implementation. Secondly, as regards the theoretical aspect, a broadened view on the use of online tracking for vehicles using a global positioning system is presented, together with practical examples, to illustrate its successful implementation in a fleet management system. The study concludes by offering suggestions and recommendations from the research results and the researcher’s experiences for future studies.
Transport Economics, Logistics & Tourism
M. Com. (Transport Economics)

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