Dissertations / Theses: 'Cellular telecommunication'

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Bria, Aurelian. "Hybrid cellular-broadcasting infrastructure systems : radio resource management issues." Licentiate thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3922.

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Timus, Bogdan. "Studies on the Viability of Cellular Multihop Networks with Fixed Relays." Doctoral thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10526.

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The use of low cost fixed wireless relays has been proposed as a way to deploy high data-rate networks at an affordable cost. During the last decade, significant academic and industrial research has been dedicated to relays. Protocol architectures for cellular-relaying networks are currently considered for standardization as part of both IEEE 802.16 and 3GPP. Various relaying techniques have successfully been commercialized over the years. This dissertation concentrates on the particular case of large scale use of low cost relays, for which focus is put on signal processing and radio resource allocation, rather than on antenna and radio frequency (RF) design, or on network planning. A key question is how low relay cost is low enough for a relaying architecture to be viable from an economic point of view? We develop a framework for evaluating the viability of relaying solutions. The framework is based on a comparison between the relaying architectures and traditional single-hop cellular architectures. This comparative analysis is done from an operator perspective, and is formulated as a network-dimensioning problem. The associated investment decisions are based on financial measures (cost or profit) and taken under technical constraints (throughput, coverage, etc.).First, we consider a large number of traditional dimensioning scenarios, in which the radio network is design for a predefined traffic demand and target quality of service level. We show that the use of low cost relays can indeed be viable, but that the cost savings vary strongly from case to case and often are only modest. Due to the half-duplex nature of the low cost relays, these relays are best suited for providing coverage to guaranteed data-rates, at low end-to-end spectral efficiency, and in environments with strong shadow fading. The type of environment and the placement of relays are more important than the specific protocols and algorithms used in the network. Therefore, traditional network planning remains an essential and challenging task, which is unlikely to be replaced by large-scale (unplanned) use of relays.Second, we suggest a new direction of research in which the viability of relays is judged considering the entire life cycle of a radio network. We give several examples in which the temporary use of relays is economically viable, especially if the service uptake is slow or the uncertainty about the future demand is high. This is particularly relevant if the last-mile cost of a network is dominated by the backhaul transmission cost, and if relaying is implemented as a feature of an access point, rather than as a new device type.
QC 20100812

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Zieba, Jan Adam Vivian. "The characterisation of space weather effects on cellular and microwave telecommunication." Diss., University of Pretoria, 2016. http://hdl.handle.net/2263/56130.

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To the knowledge of the authors, studies making use of cellular network counters to analyse the impact of solar originated radio waves on cellular telecommunication systems are a relatively unexplored area. This dissertation examines interference of solar originated radio waves with the radio aspect of terrestrial cellular telecommunications systems. A theoretical analysis was performed and real world data were also obtained from a cellular network. Solar parameters that have a potential relationship to noise generated on the cellular network were analysed, making use of the position of the sun relative to the radiation patterns of antennas of cellular network equipment. The most sensitive cellular networks are those based on the long-term evolution (LTE) standard; radio bursts of as little as 10 solar flux units (SFU), though beyond the range of the equipment, are theoretically detectable by it and bursts of 100 000 SFU have been shown to be capable of producing noise levels of -88 dBm, 13 dBm above the thermal noise level at 300 K. A comparison between sun incident hours and others, when the sun is not in direct line of sight of cellular basestation antennas, reveals increased interference, though the cellular network data do not correlate well with solar radio burst and X-ray flares, owing to lack of sample diversity and low granularity of telecommunications data and lack of extreme solar events during the period. However, potential susceptibly to solar radio interference exists, especially in the case of lower frequencies (900 MHz) in telecommunication bands (900 2100 MHz) with high bandwidth (20 MHz) applications.
Na die wete van die skrywer is studies wat van sellulêrenetwerktellers gebruik maak om die impak van radiogolwe van sonoorsprong op telekommunikasiestelsels te analiseer n relatief swak bestudeerde veld. Hierdie verhandeling ondersoek die steurings wat radiogolwe van son-oorsprong het op die radio-aspek van aard-sellulêre telekommunikasiestelsels. n Teoretiese analise is uitgevoer en gemete is verkry van n sellul êre netwerk. Sonparameters wat potensieel n verband het met ruis op die sellulêre netwerk opgewek is, is geanaliseer deur gebruik te maak van die posisie van die son relatief tot die stralingspatrone van antennas van sellulêrenetwerktoerusting. Die sensitiefste sellulêre netwerke is gebaseer op die langtermynevolusiestandaard (LTE); radiouitbarstings van so min as 10 sonvloedeenhede (SFE) is waarneembaar met LTE en daar is bewys dat uitbarstings van 100 000 SFE in staat is om ruisvlakke van -88 dBm te veroorsaak, 13 dBm bo die termiese ruisvlak by 300 K. n Vergelyking tussen son-insidensie-ure en ander, wanneer die son nie in direkte siglyn is nie, toon verhoogde inmenging, alhoewel die sellulêrenetwerkdata nie goed met sonradio-uitbarstings en X-straal fakkels korreleer nie, te danke aan die lae granulariteit van telekommunikasiedata en die afwesigheid van uiterste son-insidente gedurende die tydperk. Daar is nietemin potensieel vatbaarheid vir son-radio-steurings, veral in die geval van laer frekwensies (900 MHz) in telekommunikasiebande (900 2100 MHz) met hoë bandwydtetoepassing (20 MHz).
Dissertation (MEng)--University of Pretoria, 2016.
tm2016
Electrical, Electronic and Computer Engineering
MEng
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Ikram, Amna. "Design and development of a multiband loop antenna for cellular mobile handsets." Thesis, University of Gävle, Department of Electronics, Mathematics and Natural Sciences, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7412.

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Remiche, Marie-Ange. "Isotropic phase planar point processes: analysis and application to cellular mobile telecommunication." Doctoral thesis, Universite Libre de Bruxelles, 1999. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211887.

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Fitzpatrick, Paul G., and paul g. fitzpatrick@team telstra com. "Traffic modelling and performance of layered cellular networks with overflow." Swinburne University of Technology, 1997. http://adt.lib.swin.edu.au./public/adt-VSWT20060119.093920.

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This thesis reports on an investigation into the teletraffic modelling and performance of layered cellular networks that use overflow for new call and handover attempts in order to improve system performance It addresses the important problems how to model and analyse overflow in large cellular networks so that the overall impact across the network can be evaluated, the overflow policies that can be used with new calls and handovers to improve network performance and how these policies perform under a range of conditions. The general problem of modelling overflow in cellular networks is considered at length and from this it is concluded that the use of overflow in existing schemes such as directed retry, reuse partitioning and overlaid cells can also be described by the simple concepts of intra and inter layer overflow Using these concepts the author formulates the problem of overflow in layered networks as a subset of the general problem of overflow with multiple overflow routes and restricted overflow. This leads to the derivation of the mean and variance of the overflow traffic from a cell with multiple handover routes and restricted handover from the two-dimensional birth death model of the system. These expressions for the mean and variance are used in conjunction with the Equivalent Random Theory and splitting formulae in the development of the Splitting Formula Method or SF Method. The accuracy of three splitting formulae and a simple Poisson approximation are investigated and compared with simulation. From this we conclude that the splitting formulae of Akimaru and Takahashi and Wallstrom provide the best overall result. This method is used to solve the general problem of multiple user classes for an example two layer network. This leads to conclusions on the complex relationship between cell capacity, the proportion of uses that can access the microcells and the proportion of users that can overflow from the microcell to the macrocell. The Modified Splitting Formula Method is an extension of the SF Method that includes handovers and overflow for handovers. A user perceived measure of the effect of new call and handover blocking described by the probability of call failure augments the Modified SF method. This is then used to analyse five new call overflow policies for a three layer network under conditions of extended handover, restrictions on handover for calls in cells at the edge of layers and spatial offset between the peak of the traffic demand and the cell layout. The results give new and valuable insight into the behaviour of layered cellular networks with overflow and the trade-offs in performance that exist when designing and operating these networks.

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Keung, Yik. "Dynamic threshold call admission control policy of multi-service wireless cellular networks : a statistical approach /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202004%20KEUNG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 80-81). Also available in electronic version. Access restricted to campus users.

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Biswas, Subir Kumar. "Handling realtime traffic in mobile networks." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320943.

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Huang, Wei. "Performance of CDMA power control and admission control in multi-service cellular systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0007/NQ34270.pdf.

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Rangineni, Kiran. "Multihop Concept in Cellular Systems." Thesis, University of Gävle, Department of Technology and Built Environment, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-700.

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We are very thirsty in terms of everything to fulfil our needs in a sophisticated way, and this leads me choose the so called master thesis titled “Multihop Concept in Cellular Systems”.

This thesis introduces an approach towards the integration of relaying or multihop scheme in the next generation of cellular networks. In a multihop cellular architecture, the users send their data to the base station via relay station or with direct communication to the base station. These relay stations can either be the nomadic, fixed at specific location or users’ mobile station (i.e. mobile relay station). The main objective of this paper is to compare the difference between the relaying network architecture with different channel bandwidth as well as their performance gain. For this we integrate the relay station into conventional cellular networks using IEEE 802.16j (One of the standard introduced relay station concept in WiMAX) OFDMA (Orthogonal Frequency Division Multiple Access is a transmission technique that is based on many orthogonal subchannels (set of carriers) that transmits simultaneously). The results show that under certain conditions the throughput and coverage of the system has been increased with the introduction of the relay station in to cellular base station zone.

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Ruberg, Anders. "Frequency Domain Link Adaptation for OFDM-based Cellular Packet Data." Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6328.

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In order to be competitive with emerging mobile systems and to satisfy the ever growing request for higher data rates, the 3G consortium, 3rd Generation Partnership Project (3GPP), is currently developing concepts for a long term evolution (LTE) of the 3G standard. The LTE-concept at Ericsson is based on Orthogonal Frequency Division Multiplexing (OFDM) as downlink air interface. OFDM enables the use of frequency domain link adaptation to select the most appropriate transmission parameters according to current channel conditions, in order to maximize the throughput and maintain the delay at a desired level. The purpose of this thesis work is to study, implement and evaluate different link adaptation algorithms. The main focus is on modulation adaptation, where the differences in performance between time domain and frequency domain adaptation are investigated. The simulations made in this thesis are made with a simulator developed at Ericsson. Simulations show in general that the cell throughput is enhanced by an average of 3% when using frequency domain modulation adaptation. When using the implemented frequency domain power allocation algorithm, a gain of 23-36% in average is seen in the users 5th percentile throughput. It should be noted that the simulations use a realistic web traffic model, which makes the channel quality estimation (CQE) difficult. The CQE has great impact on the performance of frequency domain adaptation. Throughput improvements are expected when using an improved CQE or interference avoidance schemes. The gains with frequency domain adaptation shown in this thesis work may be too small to motivate the extra signalling overhead required. The complexity of the implemented frequency domain power allocation algorithm is also very high compared to the performance enhancement seen.

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Lissai, Gidon. "Assisted GPS solution in cellular networks /." Online version of thesis, 2007. http://hdl.handle.net/1850/3671.

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Ni, Wenlong. "Optimal call admission control policies in wireless cellular networks using Semi Markov Decision Process /." Connect to full text in OhioLINK ETD Center, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1227028023.

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Chen, Xi. "Using data mining techniques to discover customer behavioral patterns for direct marketing in mobile telecommunication industry." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40987942.

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Li, Bin. "Bandwidth allocation and call admission control in multi-services mobile wireless cellular networks /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202003%20LI.

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Chen, Xi, and 陳熹. "Using data mining techniques to discover customer behavioral patterns for direct marketing in mobile telecommunication industry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40987942.

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Conner, William J. "The effects of China entering the World Trade Organization on the South Korean wireless telecommunication industry." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://handle.dtic.mil/100.2/ADA420219.

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Thesis (M.S. in National Security Affairs)--Naval Postgraduate School, December 2003.
Thesis Advisor(s): H. Lyman Miller, Glenn R. Cook. "December 2003." Includes bibliographical references (p. 63-67). Also available in print.

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Conner, William J. "The effects of China entering the World Trade Organization on the United States' wireless telecommunication industry." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Dec%5FConner%5FITM.pdf.

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Thesis (M.S. in Information Technology Management)--Naval Postgraduate School, December 2003.
Thesis advisor(s): H. Lyman Miller, Glenn Cook. Includes bibliographical references (p. 69-74). Also available online.

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Bria, Aurelian. "Mobile Multimedia Multicasting in Future Wireless Systems : A Hybrid Cellular-Broadcasting System Approach." Doctoral thesis, Stockholm : Informations- och kommunikationsteknik, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9795.

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Vukadinovic, Vladimir. "Bit-Rate Allocation, Scheduling, and Statistical Multiplexing for Wireless Video Streaming." Licentiate thesis, KTH, Communication Networks, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4819.

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Due to the scarcity of wireless resources, efficient resource allocation is essential to the success of cellular systems. With the proliferation of bandwidth-hungry multimedia applications with diverse traffic characteristics and quality of service requirements, the resource management is becoming particularly challenging. In this thesis, we address some of the key link-layer resource allocation mechanisms that affect the performance of video streaming in cellular systems: bit-rate allocation, opportunistic scheduling, and statistical multiplexing. The bit-rate allocation problem involves the distortion-optimal assignment of source, channel, and pilot data rates under link capacity constraints. We derive an analytical model that captures the video distortion as a function of these data rates and, based on it, we study various bit-rate allocation strategies. The opportunistic scheduling problem addresses the throughput-optimal assignment of time-slots among users with diverse channel conditions under certain fairness constraints. We focus on two aspects of the opportunistic scheduling: the performance of delay-constrained streaming applications and possible extensions of the opportunistic concepts to multicast scenarios. Finally, the statistical multiplexing is a resource-efficient method for smoothing out the extreme burstiness of video streams. We study possible statistical multiplexing gains of H.264 video streams in the context of E-MBMS architecture.

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Khan, Faisal Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Effects of interference on GPS timing receivers and their impacts on communications networks." Awarded by:University of New South Wales. Electrical Engineering & Telecommunications, 2007. http://handle.unsw.edu.au/1959.4/30201.

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The rapid evolution of current and upcoming high speed and complex communications networks often necessitates flawless time synchronization among the network nodes in order to guarantee performance. GPS based synchronizers have long been used for synchronizing telecommunications equipment, currently providing an accuracy of up to 10ns. Such high accuracy demands excellent operation from GPS timing receivers. Interference is an important threat to GPS performance. Any degradation in performance, due to the introduction of interference, can cause these receivers to provide a low quality timing solution, or to lose lock with incoming GPS signals altogether. This consideration motivates the study of the performance of GPS timing receivers in the presence of harmful interference. This work is devoted to the theoretical and practical investigations of the effects of RF interference on GPS-based synchronizers and their impacts on communications networks. Contributions made during this work include: a) Identification of the processes and the parameters involved in producing a timing solution which are vulnerable to interference; b) experimentbased confirmation of a hypothesis about the effects of interference on GPS timing receivers; c) identification of the effects of degraded synchronization on the performance of communications networks, especially CDMA and GSM cellular networks, which rely upon GPS based synchronizers; and d) proposal of a method to predict and avoid communications network performance degradation.

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Narisetti, Mary. "Implementation of vertical handoff algorithm between IEEE 802.11 WLAN and CDMA cellular network." unrestricted, 2005. http://etd.gsu.edu/theses/available/etd-07202006-181806/.

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Thesis (M.S.)--Georgia State University, 2005.
Title from title screen. Yi Pan, committee chair; Anu G. Bourgeois, A. P. Preethy, committee members. Electronic text (84 p. : i;;. (some col.)) : digital, PDF file. Description based on contents viewed July 2, 2007. Includes bibliographical references (p. 67-68).

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Li, Yingjie. "Bit error rate simulation of a CDMA system for personal communications." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07282008-135717/.

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Yilmaz, Nusrat. "Resource Management In Cellular Communication Networks With Subscriber Profile Prediction." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606274/index.pdf.

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In this study, a dynamic resource management and subscriber profile prediction scheme for mobile communication systems is presented. The aim is to achieve a high level of QoS for both handoff calls and new calls, while at the same time to improve the utilization of wireless network resources. The simultaneous satisfaction of these two actually conflicting interests will be thanks to two major key features. First, it will be due to the individual subscriber profile based prior information about handoff reservation requests that are provided by the mobile terminals. This information is based on the cell transition probabilities calculated by the mobile itself using collected information during past operations. Second, it will be due to a two-way approach implemented in the resource management processes. The two-way approach controls both the amount of reserved radio channels and the new call admission in a dynamic way, depending on the subscriber mobility and network traffic conditions.

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Zhu, Jian. "Indoor/Outdoor Location of Cellular Handsets Based on Received Signal Strength." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11489.

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Indoor/Outdoor Location of Cellular Handsets Based on Received Signal Strength Jian Zhu 123 pages Directed by Dr. Gregory D. Durgin Accurate geo-location is an important emerging technology for public safety, commercial use, and military application. Especially, in the United States, the wireless Enhanced 911 (E911) rules by the Federal Communication Commission (FCC) seek to provide 911 dispatchers with additional information on wireless 911 calls. This dissertation presents a novel technique for indoor/outdoor location of cellular handsets based on received signal strength (RSS) measurements taken by a cellular handset of the surrounding base stations. RSS location accuracy for different environments is studied as a function of base station separation distance, cell sector density, measurement density, radio propagation environment, and accuracy of measurement. The analytical and experimental results in this thesis serve as a guideline for the accuracy of RSS signature location technology under different conditions. Accurate outdoor to indoor penetration models are proposed and validated for dense urban areas by introducing pseudo-transmitters to simulate the wave-guiding effects in urban canyon environments. A set of location algorithms is developed to improve location accuracy. Furthermore, an algorithm to discriminate between indoor and outdoor users is proposed and validated. The research results demonstrate the feasibility of RSS location techniques to meet the FCCs requirements for E911 accuracy in urban and semi-urban environments. The techniques remain accurate for indoor handsets. The results also suggest that a hybridization of the handset-based GPS method and the RSS signature method may prove to be the most effective solution for locating handsets across a range of environments; including rural, suburban, dense urban, and indoor.

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Broege, Stephanie, and n/a. "Mobile New Zealand : a multi-method comparative study of cell phone use." University of Otago. Department of Media, Film and Communication Studies, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080819.150246.

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Worldwide use of mobile phones has created a new basis for interpersonal communication and has become a ubiquitous feature of youth culture. Hence the examination of global mobile phone adoption is a global challenge for communication researchers as well as for the media industries. Thus far, New Media research in New Zealand (NZ) has focused on children and teenagers. The group of young adults between 18-25 years has rarely been surveyed. This thesis focused on university students� use of mobile communication in NZ in the context of their everyday practices. The Mobile Media Study (MMS) was designed as a cross-national comparative research project with a focus on NZ together with one European and one North American country. The usage behavior, experiences, attitudes, and opinions of young NZers� towards mobile phone use was examined and contrasted to young German and American students. Methodological and data triangulation was applied and data was collected at the University of Otago, the City University of New York, the Pennsylvania State University, and the University of Leipzig. MMS survey research was conducted along with focus group and personal interviews, and qualitative exercises. In addition, the latest data from a longitudinal study of New Media use in Germany, the US and NZ served as a secondary, comparative, and complementary dataset. The research questions focused on general mobile phone use, text-messaging (SMS), the acceptance of Third Generation (3G) cell phones, mobile phone use in public places, gender-specific usages, and the construction of mobile social networks. Altogether, data from 1,316 students at four universities in three countries was analyzed. Results indicated that the number of providers as well as tariff structures appear to influence mobile phone adoption within a country. To adjust to the duopoly situation young people in NZ preferred prepaid cards in connection with a SMS package. This was reflected by extraordinarily high use of SMS in NZ. By comparison German and American students preferred annual contracts. Americans, who had the strongest preference for mobile calling, also had the highest monthly expenses. Additionally, findings revealed that overall user interest in 3G services is not yet very high. It was found that in particular NZ students do not exploit the full range of mobile services already available to them and feel confident that their current cell phone gratifies all their needs. They concentrate on using basic functions, such as calling and SMS. In addition, results suggest a decreasing role of the landline telephone and email for interpersonal communication. Gender differences were found with NZ women in particular being most enthusiastic about SMS. German men had the most negative attitude toward SMS and also used the service the least in comparison to the other students surveyed. In general women had a preference for the communicative functions on their mobile phone including voicemail and more women than men in Germany and NZ were found to play mobile phone games. Finally, evidence of gender specific social network structures were found in NZ with male networks resembling spider webs while female networks were centered so that all persons in the network connected back to the center. Overall, students only used a fraction of the contacts in their mobile phone book and communicated mostly within a limited local area. In conclusion, a replication of the MMS was suggested along with further multi-method research in the field of Asian-NZer�s New Media use.

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Chiu, Wan Lan. "Competitive analysis : a case study of the mobile telecommunication services industry in Hong Kong." Thesis, University of Macau, 2003. http://umaclib3.umac.mo/record=b1636643.

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Bucher, John R. "An overview of cellular telecommunications." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28437.

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Jilläng, Emil. "Making ASN.1 (Abstract Syntax Notation One) human-readable : Investigative and practical study to generalize decoding and manual validation of ASN.1 from the cellular network during run time." Thesis, Luleå tekniska universitet, Institutionen för system- och rymdteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67595.

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ASN.1 is a powerful formal notation divided into two parts, a specification of the data and the data itself in binary form. Creating decoders for these files can often be tedious. The purpose of this degree work is to extend current tools at Arctic Group to make an application that decodes a range of different ASN.1 specifications and data. This should be done during runtime, without needing to rebuild the application for each specification, while generating human-readable data and abstracting unwanted information. Two ways to create ASN.1 decoders were identified, and the application was designed taking heavy inspiration from a solution that stores intermediate data in a list. By not including encoding as a feature of the application a few shortcuts could be made, and the desired result could be achieved during runtime. The application was designed to include three parts. The first part was an ASN.1 parser using the Java-based tool ANTLR4. The second part matched the binary data to the information in the specification. The final part was an output formatter that abstracts and prettifies the output data to text files. The result was an application that parses at least three of the most commonly used specifications of the employer and does only have to be rebuilt when a new data type is present in the specifications. Problems arose when matching the data to the ASN.1 specifications, thus the matching and output formatting was only partially implemented. The application was evaluated by testing many different ASN.1 specifications, making sure everything was generated correctly during runtime and extending the parser to support more syntax as it was introduced in new specifications. Although the application did not support any arbitrary ASN.1 specification, it could serve as a foundation for further development to make the application truly generalized.
ASN.1 är en kraftfull formell notation uppdelad i två delar. En specifikation av data och medföljande data i binär form. Att skapa avkodare till dessa filer kan ofta vara tidskrävande. Syftet med det här examensarbetet är att vidareutveckla nuvarande verktyg på Arctic Group till en applikation som avkodar ett flertal olika ASN.1-specifikationer och data. Detta skall göras under körning och skall inte kräva att applikationen byggs om för varje specifikation. Applikationen skall även generera mänskligt läsbar utdata och abstrahera bort oönskad information. Två sätt att bygga en ASN.1-avkodare hittades under förstudien och applikationen designades med inspiration av en lösning som sparar data i en mellanliggande lista. Genom att inte inkludera kodning av data i applikationen kunde genvägar tas och det önskade resultatet kunde uppnås under körning. Applikationen designades med tre delar. Den första delen var en ASN.1-läsare som använde verktyget ANTLR4 byggt i Java, den andra en del som matchade informationen från specifikationen till den binära datan. Den sista delen var en formaterare för utdata som även abstraherade bort oönskad information. Resultatet blev en applikation som korrekt läser av minst tre av de mest använda ASN.1-specifikationerna hos uppdragsgivaren och som bara behöver byggas om då en ny datatyp introduceras i specifikationerna. Problem uppstod vid matching av data till specifikationen vilket ledde till att matchningen och formateringen blev bara delvis implementerat. Applikationen utvärderades genom att testa många olika ASN.1 specifikationer, kontrollera att allt genererades korrekt under körning och att utöka läsaren efterhand för att kunna hantera mer syntax då den introducerades i de nya specifikationerna. Även om applikationen inte än stödjer godtycklig ASN.1-specifikation kan den verka som en bas för vidareutveckling mot en mer komplett generaliserad lösning.

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Oelofse, Christina Hermiena. "The learner profile of a teenage cell phone user." Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-07102009-160407.

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Olsson, Joel, and Junior Asante. "5G Simulation Framework." Thesis, Linköpings universitet, Kommunikationssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149484.

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From the first generation, 1G, to the fourth generation, 4G, the development and technological advancements in telecommunications network systems have been remarkable. Faster and better connections have opened up for new markets, ideas and possibilities, to that extent that there now is a demand that surpasses the supply. Despite all these advancements made in the mobile communications field most of the concept of how the technology works and its infrastructure has remained the same. This however, is about to change with the introduction of the fifth generation (5G) mobile communication. With the introduction of 5G much of the technology introduced will be different from that of previous generations. This change extends to include the entire infrastructure of the mobile communications system. With these major changes, many of the tools available today for telecommunications network evaluation do not really suffice to include the 5G network standard. For this reason, there is a need to develop a new kind of tool that will be able to include the changes brought by this new network standard. In this thesis a simulation framework adapted for the next generation telecommunication standard 5G is set to be developed. This framework should include many of the characteristics that set 5G aside from previous generations.

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Nguyen, Son. "Capacity and Throughput Optimization in Multi-cell 3G WCDMA Networks." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc4948/.

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User modeling enables in the computation of the traffic density in a cellular network, which can be used to optimize the placement of base stations and radio network controllers as well as to analyze the performance of resource management algorithms towards meeting the final goal: the calculation and maximization of network capacity and throughput for different data rate services. An analytical model is presented for approximating the user distributions in multi-cell third generation wideband code division multiple access (WCDMA) networks using 2-dimensional Gaussian distributions by determining the means and the standard deviations of the distributions for every cell. This model allows for the calculation of the inter-cell interference and the reverse-link capacity of the network. An analytical model for optimizing capacity in multi-cell WCDMA networks is presented. Capacity is optimized for different spreading factors and for perfect and imperfect power control. Numerical results show that the SIR threshold for the received signals is decreased by 0.5 to 1.5 dB due to the imperfect power control. The results also show that the determined parameters of the 2-dimensional Gaussian model match well with traditional methods for modeling user distribution. A call admission control algorithm is designed that maximizes the throughput in multi-cell WCDMA networks. Numerical results are presented for different spreading factors and for several mobility scenarios. Our methods of optimizing capacity and throughput are computationally efficient, accurate, and can be implemented in large WCDMA networks.

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Cruz, Bruno de Oliveira. "Impact of M2M communications on cellular telecommunications networks." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/14475.

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Mestrado em Engenharia Electrónica e de Telecomunicações
As comunicações Máquina-Máquina (M2M) apresentam um crescimento muito significativo e algumas projeções apontam para que esta tendência se acentue drasticamente ao longo dos próximos anos. O tráfego gerado por este tipo de comunicações tem caraterísticas muito diferentes do tráfego de dados, ou voz, que atualmente circula nas redes celulares de telecomunicações. Assim, é fundamental estudar as caraterísticas dos tipos de tráfego associados com comunicações M2M, por forma a compreender os efeitos que tais caraterísticas podem provocar nas redes celulares de telecomunicações. Esta dissertação procura identificar e estudar algumas das caraterísticas do tráfego M2M, com especial enfoque na sinalização gerada por serviços M2M. Como resultado principal deste trabalho surge o desenvolvimento de modelos que permitem a construção de uma ferramenta analítica de orquestração de serviços e análise de rede. Esta ferramenta permite orquestrar serviços e modelar padrões de tráfego numa rede UMTS, possibilitando uma análise simultânea aos efeitos produzidos no segmento core da mesma rede. Ao longo deste trabalho procura-se que a abordagem aos problemas apresentados permita que os resultados obtidos sejam válidos, ou adaptáveis, num âmbito mais abrangente do que apenas as comunicações M2M.
Machine to Machine (M2M) communications present significant growth and some projections indicate that this trend is going to increase dramatically over the coming years. The traffic generated by this type of communication has very different characteristics when compared to data or voice traffic currently going through cellular telecommunications networks. Thus, it is essential to study the characteristics of traffic associated with M2M communications in order to understand the effects that its features can imply to cellular telecommunications networks. This dissertation tries to identify and study some of the characteristics of M2M traffic, with particular focus on signaling generated by M2M services. A number of models, that enable the development of an analytic tool for service orchestration and network analysis, are presented. This tool enables service orchestration and traffic modeling on a UMTS network, with simultaneous visualization of the impacts on the core of such network. The work presented in this document seeks to approach the problems at study in ways ensuring that its outcomes are valid for a wider scope than just M2M communications.

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Aburas, Akram. "Operating System Based Perceptual Evaluation of Call Quality in Radio Telecommunications Networks. Development of call quality assessment at mobile terminals using the Symbian operating system, comparison with traditional approaches and proposals for a tariff regime relating call charging to perceived speech quality." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5479.

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Call quality has been crucial from the inception of telecommunication networks. Operators need to monitor call quality from the end-user's perspective, in order to retain subscribers and reduce subscriber 'churn'. Operators worry not only about call quality and interconnect revenue loss, but also about network connectivity issues in areas where mobile network gateways are prevalent. Bandwidth quality as experienced by the end-user is equally important in helping operators to reduce churn. The parameters that network operators use to improve call quality are mainly from the end-user's perspective. These parameters are usually ASR (answer seizure ratio), PDD (postdial delay), NER (network efficiency ratio), the number of calls for which these parameters have been analyzed and successful calls. Operators use these parameters to evaluate and optimize the network to meet their quality requirements. Analysis of speech quality is a major arena for research. Traditionally, users' perception of speech quality has been measured offline using subjective listening tests. Such tests are, however, slow, tedious and costly. An alternative method is therefore needed; one that can be automatically computed on the subscriber's handset, be available to the operator as well as to subscribers and, at the same time, provide results that are comparable with conventional subjective scores. QMeter® 'a set of tools for signal and bandwidth measurement that have been developed bearing in mind all the parameters that influence call and bandwidth quality experienced by the end-user' addresses these issues and, additionally, facilitates dynamic tariff propositions which enhance the credibility of the operator. This research focuses on call quality parameters from the end-user's perspective. The call parameters used in the research are signal strength, successful call rate, normal drop call rate, and hand-over drop rate. Signal strength is measured for every five milliseconds of an active call and average signal strength is calculated for each successful call. The successful call rate, normal drop rate and hand-over drop rate are used to achieve a measurement of the overall call quality. Call quality with respect to bundles of 10 calls is proposed. An attempt is made to visualize these parameters for better understanding of where the quality is bad, good and excellent. This will help operators, as well as user groups, to measure quality and coverage. Operators boast about their bandwidth but in reality, to know the locations where speed has to be improved, they need a tool that can effectively measure speed from the end-user's perspective. BM (bandwidth meter), a tool developed as a part of this research, measures the average speed of data sessions and stores the information for analysis at different locations. To address issues of quality in the subscriber segment, this research proposes the varying of tariffs based on call and bandwidth quality. Call charging based on call quality as perceived by the end-user is proposed, both to satisfy subscribers and help operators to improve customer satisfaction and increase average revenue per user. Tariff redemption procedures are put forward for bundles of 10 calls and 10 data sessions. In addition to the varying of tariffs, quality escalation processes are proposed. Deploying such tools on selected or random samples of users will result in substantial improvement in user loyalty which, in turn, will bring operational and economic advantages.

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Valletti, Tommaso Maria. "Competitive strategies and market regulation in the cellular telecommunications industry." Thesis, London School of Economics and Political Science (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300435.

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Moral, López Elena. "Muting pattern strategy for positioning in cellular networks." Thesis, Linköpings universitet, Artificiell intelligens och integrerade datorsystem, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138767.

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Location Based Services (LBS) calculate the position of the user for different purposes like advertising and navigation. Most importantly, these services are also used to help emergency services by calculating the position of the person that places the emergency phone call. This has introduced a number of requirements on the accuracy of the measurements of the position. Observed Time Difference of Arrival (OTDOA) is the method used to estimate the position of the user due to its high accuracy. Nevertheless, this method relies on the correct reception of so called positioning signals, and therefore the calculations can suffer from errors due to interference between the signals. To lower the probability of interference, muting patterns can be used. These methods can selectively mute certain signals to increase the signal to interference and noise ratio (SINR) of others and therefore the number of signals detected. In this thesis, a simulation environment for the comparison of the different muting patterns has been developed. The already existing muting patterns have been simulated and compared in terms of number of detected nodes and SINR values achieved. A new muting pattern has been proposed and compared to the others. The results obtained have been presented and an initial conclusion on which of the muting patterns offers the best performance has been drawn.
muting, patterns, location, networks, OTDOA, LTE, PCI

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Parand, Farivar. "Cellular optical wireless communications systems." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270654.

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Hau, Yan Kit Gary. "Multicarrier microwave amplifier for cellular communications." Thesis, University of Leeds, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289809.

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Razavi, S. H. "Data transmission over TACS cellular radio." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329178.

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Foster, Howard Mark Jameson. "High capacity cellular mobile radio systems." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301208.

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Lee, Chin-Chun. "CDMA for cellular mobile radio systems." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240979.

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Ko, Yiu Fai. "Digital cellular mobile radio links and networks." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280911.

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Tusubira, F. F. "Low level multiplexing in cellular radio systems." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383401.

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Cardoso, Fabbryccio Akkazzha Chaves Machado. "Aplicações de antenas inteligentes e equalização concorrente em sistemas WCDMA/HSDPA." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261738.

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Orientador: Dalton Soares Arantes
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-08-04T09:25:15Z (GMT). No. of bitstreams: 1 Cardoso_FabbryccioAkkazzhaChavesMachado_M.pdf: 6296555 bytes, checksum: 2190ae93699da79f815c9e5199564080 (MD5) Previous issue date: 2004
Resumo: Nesta tese são investigados e propostos diferentes algoritmos adaptativos para antenas inteligentes e equalização em receptores de usuário no enlace de descida de sistemas WCDMA/HSDPA. Considerando o tema de equalização de canal, propõe-se um algoritmo adaptativo de retro-propagação com subsistemas concorrentes. Esta técnica de equalização explora características específicas de um sinal WCDMA e foi inspirada na técnica de equalização cega concorrente desenvolvida por Fernando C. C. de Castro et al. Com relação a antenas inteligentes, propõe-se um esquema adaptativo de recepção espaço-temporal de múltiplos alvos, denominado MT-STR, que emprega K processadores de antenas e um com binador de sinais dos vários alvos, ou fingers, do receptor. Esta técnica de recepção foi testada num cenário de soft-handover bastante severo, envolvendo muitos sinais interferentes. Ainda no escopo de antenas inteligentes, estudou-se também o efeito do acoplamento mútuo e do descasamento de amplitude e fase em arranjos co-lineares de antenas dipolo de meia onda
Abstract: This dissertation investigates and proposes different algorithms for smart antennas and channel equalization aiming at WCDMA HSDPA downlink receivers. Considering the channel equalization issue, we propose an adaptive back-propagation algorithm with concurrent sub-systems. This equalization technique exploits particular characteristics of a WCDMA downlink signal and is based on the concurrent blind equalization technique developed by Fernando C. C. de Castro et al. For smart antennas, a multi-target space-time receiver (MT-STR) which uses K array processors and an adaptive ratio combiner is proposed. This technique has been tested under a severe soft-handover scenario assuming many interferers. The effects of mutual coupling and amplitude phase mismatch on co-linear half-wave dipole arrays for WCDMA down1ink receivers are also investigated.
Mestrado
Telecomunicações e Telemática
Doutor em Engenharia Elétrica

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Silva, Sandro Marcio da. "A gestão das competências organizacionais em empresas da cadeia de valor para provimento de telefonia celular de 3ª geração (3G)." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/12/12139/tde-22102002-125128/.

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A tese teve como objetivo analisar os processos de desenvolvimento e compartilhamento intra-empresarial de competências organizacionais. Foi analisada a relação entre a Telemig Celular e as empresas que com ela compunham, em junho de 2002, a cadeia de valor para provimento de serviços de telefonia celular. O desenvolvimento das competências organizacionais foi analisado à luz da perspectiva de oferta dos serviços de 3G. A Telemig Celular foi analisada por meio de entrevistas e um workshop junto ao corpo gerencial. As demais empresas da cadeia foram abordadas via entrevistas junto às gerências de RH e estratégia. A utilização do modelo de Fransman mostrou que as relações entre as empresas ainda não constituem efetivas parcerias. Os elos mais forte da cadeia indústria de equipamentos, baseada no domínio tecnológico, e operadoras, baseadas no acesso ao usuário final - têm liderado as decisões mais importantes da cadeia. Observou-se que o desenvolvimento das competências organizacionais é mais estruturado na camada 1, em que há claras regras de desenvolvimento e proteção das competências, além de diretrizes e alocação de recursos para a realização de pesquisas. Também os investimentos em RH são existentes e mais conectados com a estratégia organizacional. Nas demais empresas da cadeia encontraram-se áreas de RH reduzidas, quando existentes, e que adotam práticas e políticas de gestão tradicionais. A pesquisa mostrou que falta às empresas e, principalmente, ao RH uma visão integrada de negócios e cadeia de valor, o que tem levado à subordinação das empresas brasileiras e menores às empresas multinacionais e maiores.
This paper aimed to analyze the processes of development and intra-company sharing of organizational competencies. It looked at the relationship between Telemig Celular company and its counterparts making up the value chain in June 2002 for providing cellular telephone services. The organizational competency development was considered in the light of the 3G-service supply perspective. Telemig Celular was analyzed through interviews and a workshop with its managers. The other companies in the chain were approached through interviews with their strategy and HR managements. By using Fransman's model it was shown that the company relationships are not effective partnerships yet. The strongest links in the chain equipment industry relying on their technological supremacy, and carriers relying on end user access have been taking the chain's most important decisions. The development of organizational competencies was observed to be more structured in layer 1, where there are clear development rules and competency protection, as well as guidelines and fund allocation for research. Also, HR investments are present, and they are more connected to organizational strategy. In the rest of the chain companies, the research found small HR areas, if any, adopting traditional management practices and policies. And it showed that companies, mainly their HR, lack an integrated view of business and value chain, which has been leading to the subordination of the Brazilian and smaller companies to the multinational and larger ones.

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Havlíčková, Klára. "Analýza současných služeb vybraného mobilního operátora." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-124710.

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The theme of the thesis is an analysis of current mobile operator selected services. This work focuses on the present and the future development of mobile internet connection. The aim is to analyze existing services at Telefónica Czech Republic and The work is divided into several parts. The first part focuses on the selection of a particular operator. I described at al. Czech Republic and Telefónica, which is the first integrated operator in the Czech Republic. The company currently operates more than seven million mobile numbers and fixed lines, making it one of the leading providers of fully converged services in Europe. I focused on the organizational structure of the company and its description. The second part is historical, describes the history of mobile networks in the CR, the history of mobile communications in the data and the development of mobile connections in the country. The third part is theoretical, describes al. Czech Republic Telefonica SpA in terms of services it offers in this section is also described ISO certification, EMS policy and business principles. Are described voice and mobile services, mobile data services and connectivity technologies and different types of technologies (GSM, GPRS, EDGE, UMTS, HSDPA, HSPA + and LTE). Another section includes the development of mobile connections in the CR, the current situation where Telefónica provides 3G connection for almost 71% of the population and the current state of commercial LTE network. I tried to describe the current mobile platforms, and even telecommunications market in the Czech Republic. The penultimate section specifies the geographic traffic distribution network operator and the last part, I dealt with the analysis and comparison services. The total contribution of the thesis see the approach and evaluation of existing services together. Telefónica Czech Republic, as, which is one of the largest telecommunications companies in the world.

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Spencer, Logan Lemuella C. "Changing from the silo model to the horizontal layers model in public policy regulations : the implications and potential for the telecommunications industry /." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-11282005-192311/.

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Kotsopoulos, S. A. "Frequency planning techniques for cellular mobile radio systems." Thesis, University of Bradford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332176.

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Hammuda, Husni. "Spectral efficiency of cellular land mobile radio systems." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279698.

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Fortune, P. M. "Multi-level modulation schemes for digital cellular mobile radio." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/421471/.

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Dissertations / Theses on the topic 'Cellular telecommunication'

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