global system for mobile communications ppt

... Trang 1GSM – GLOBAL SYSTEM FOR MOBILE COMMUNICATION Kiến trúc hệ thống và các giao thức Nhóm sinh viên: Trần Xuân Bách ... Mobile Station (MS)  Mobile Equipment (ME)  Subscriber Identity Module (SIM)  Base Station Subsystem (BBS)  Base Transceiver Station (BTS)  Base Station Controller (BSC)  Network Subsystem ... Subsystem  Mobile Switching Center (MSC)  Home Location Register (HLR)  Visitor Location Register (VLR)  Authentication Center (AUC)  Equipment Identity Register (EIR) Trang 5ME (Mobile Equipment)ME

Ngày tải lên: 24/06/2022, 08:30

... Lecture 16 GSM: Global System for Mobile Communication Dr Ghalib A Shah Trang 4 Various systems have been developed without the benefit of standardized specifications.  Digital Systems: ► Ease ... major systems: ► switching system (SS) • is responsible for performing call processing and related functions. subscriber-► base station system (BSS), • All radio-related functions are performed ... operation and support system (OSS) • the functional entity from which the network operator monitors and controls the system • To offer the customer cost-effective support for centralized, regional,

Ngày tải lên: 05/07/2022, 13:09

... will be available for mobile users as for fixed, and they will behave as intended Existing applications will not need to be rewritten for the special features of the mobile system (as tends to ... reasons for i-mode's relative (and absolute) success, for example: • Low PC penetration in Japan (for cultural reasons) • High charges for PSTN dial-up access in Japan • The Japanese enthusiasm for ... approach • '3G' is about the new mobile system, its architecture, network, and air interface So, 'IP for 3G' is about the convergence of the Internet and mobile communications revolutions This

Ngày tải lên: 27/10/2013, 17:15

... normally served by a schema For example, DataGuides are essential for users to explore the structure of the database and formulate queries They also are important for the system, e.g., to store statistics ... is unreasonable for very large databases Further, without information about the struc-ture of the database, the query processor may be forced to perform more work than necessary For example, consider ... Management System for Semistructured DataJason McHugh, Serge Abiteboul, Roy Goldman, Dallan Quass, Jennifer Widom Stanford University f mchughj,abitebou,royg,quass,widom g @db.stanford.edu http://www-db.stanford.edu/lore

Ngày tải lên: 23/03/2014, 12:20

... HSDPA/HSUPA for UMTS HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications Edited by Harri Holma and Antti Toskala © 2006 John Wiley & Sons, Ltd ISBN: 0-470-01884-4 HSDPA/HSUPA for ... Pedersen 7.1 General performance factors 7.1.1 Essential performance metrics 7.2 Single-user performance 7.2.1 Basic modulation and coding performance 7.2.2 HS-DSCH performance 7.2.3 Impact of ... cases: HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications Edited by Harri Holma and Antti Toskala © 2006 John Wiley & Sons, Ltd ISBN: 0-470-01884-4 HSDPA/HSUPA for UMTS 218 Consumer-rich

Ngày tải lên: 01/06/2014, 09:38

... cells. Advantages for use of the HCMV amplicon Foremost among the advantages of the vector system we have described is the potential ability to efficiently infect and deliver genetic information to ... could therefore be targeted for therapy with this strategy. Another potential advantage for the sys- tem is that vector DNA could possibly be maintained as an episome with minimal concern for the ... number not for citation purposes) and expressing foreign genes in infected primary cells including progenitor stem cells such as human CD34+ cells. Further improvement and optimization of the system

Ngày tải lên: 14/08/2014, 19:22

... 1.1.2 Second Generation (2G) Mobile Communications 9 1.1.3 Third Generation Mobile Communications 15 1.1.4 Beyond Third Generation Mobile Communications 19 1.2 Mobile Propagation Channel ... 181 Trang 8In digital communications, especially for mobile communications, adaptive signalprocessing techniques are widely used to improve the system performance For ex-ample, adaptive equalization ... by code (CDMA) or time division (TDMA) wire-There are four main standards for 2G systems: Global System for Mobile(GSM) communications and its derivatives, Digital AMPS (D-AMPS), code di-vision

Ngày tải lên: 17/09/2015, 17:18

... pro-vides a good baseline for the future development of a new mobile broadcast system The new system would be able to reuse the infrastructure and components that would be available for DVB-T2 At the ... quality encodings by splitting or refining the transform coeffi-cients For detailed information about architecture, system, and transport interface for SVC, the reader is referred to the Special Issue ... However, steady need for higher quality services is projected to surpass the capabilities of the existing mobile broadcast systems Consequently, work on new generations of mobile broadcast technology

Ngày tải lên: 26/03/2020, 03:16

... Communication Systems 25 2.2.1 Analogue First Generation Cellular Systems 25 2.2.2 Digital Second Generation Systems 25 2.3.2 Evolution of 2G Systems towards 3G 29 2.3.3 Worldwide 3G Standardisation Efforts ... Physical Layer and for User Traffic Generation 221 5.1 How to Account for the Physical Layer? 221 5.1.1 What to Account For and How? 221 5.1.2 Using Approximations for Error Performance Assessment ... industry towards the merging of wireless communications and based data communications, including their impact on multiple access strategies for mobilecommunications Indeed, in tune with the increasing

Ngày tải lên: 20/04/2023, 09:32

... recommendations for him The system’s target users are mobile users (i.e., those interact with the system using some Trang 12kinds of mobile devices such as mobile phones, PDAs, etc) Therefore, the ... prototypical system iDo — the recommender system aimed at recommending personalized leisure activity sequences for mobile users In order to solve the problem of recommending item sequences for mobile ... standard hybrid recommendation system 3 Mobile RSs Recently, mobile RSs are widely applied for some main tasks and functions as introduced here The mobile RSs are used for the purpose of tourist

Ngày tải lên: 09/11/2025, 09:30

... used for network planning or for coarsestudies to understand the interrelations of new features, for example, heterogeneous networks [12] In this work we will present the theoretical framework for ... of service, and mobility This is of particular importance for simulations of self-organizing networks For this purpose, conventional system level simulators are not suitable due to slow simulation ... excluded from the simulations For instance, if the downtilt angle is changed too fast, RRM measurements might get confused leading to an unstable system Similar things hold for other SON use cases

Ngày tải lên: 21/06/2014, 11:20

... Therefore, system capacity is limited by interference, which is particularly crucial for mobile ter-minals with a single receive antenna Nevertheless, next generation mobile communications systems ... 2007; Accepted 17 November 2007 Recommended by Luc Vandendorpe Radio networks for future mobile communications systems, for example, 3GPP Long-Term Evolution (LTE), are likely to use an orthogonal ... comparison to conventional zero-forcing reception, particularly for high SNRs Rayleigh fading channels In the following, we derive closed form expressions for BEP after SAIC forM-ary ASK transmission

Ngày tải lên: 22/06/2014, 06:20

... Techniques for 4G Mobile Communications, Shinsuke Hara and Ramjee Prasad OFDM for Wireless Multimedia Communications, Richard van Nee and Ramjee Prasad Radio over Fiber Technologies for Mobile Communications ... aims for more than 2-Mbps throughput, is under environ-1 Trang 212 Multicarrier Techniques for 4G Mobile CommunicationsFigure 1.1 A rough sketch of present and future mobile communications systems. ... [21].)1.3 Multicarrier Techniques for 4G Systems Figure 1.7 shows the evolution of mobile communications systems In sions about 2G systems in the 1980s, two candidates for the radio accesstechnique

Ngày tải lên: 26/04/2013, 09:50

... to information contained in reporting format One is when there is an insufficient detailed format User will need to go fishing for the information or can take a wrong decision for lack of format ... Athens, Greece) For such financial statements, the comparable accounting information are often unavailable The issue is: which accounting information systems provide better decisional help for SMEs ... needs for accounting and financial information for management în one side and bank on other side in two countries, Canada and Romania, it will be enable to show how accounting and financial information

Ngày tải lên: 17/02/2014, 09:20

... their communications functions Strategic communications audits are one tool that can help to meet this need Strategic Communications Audits Defined A strategic communications audit is a systematic ... communications audit is a systematic assessment, either formal or informal, of an organization’s capacity for, or performance of, essential communications practices It determines what is working ... among for-profits than nonprofits, and not familiar to most non-communications professionals Audits are most often performed by external communications or evaluation experts, but can also be performed

Ngày tải lên: 23/03/2014, 02:20

... distance from systemic stress) Long-lag forecasts Long-lag models allow us to forecast stress at longer horizons, which is an advantage for ante policy actions The value of a forecast with a ... macroprudential early ing systems (EWSs) to develop a new, hybrid class of models for systemic risk, incorporating the structural characteristics of the fi nancial system and a feedback amplifi ... early‐warning system (EWS) for identifying systemic banking risk, which will give policymakers and supervisors time to prevent or mitigate a potential financial crisis It is important to forecast—and

Ngày tải lên: 25/03/2014, 04:21

... First,consider a synchronous CDMA system Since it uses a system-widetiming reference based on the Global Positioning System (GPS),symbols transmitted by individual mobile stations are synchronous.Thus, ... for all paths ofthe trellis diagram are computed For an encoder with m registers, the number of states for the lis diagram is 2m1 For instance, for the diagram of Figure 3-7, m  trel-3, and the ... appli-cation of adaptive antennas to mobile communications systems[37]—[39], [42] Reference [40] discusses the possibility of extendingthe capacity of an existing cellular system so as to serve areas

Ngày tải lên: 18/06/2014, 10:05

... showed that the proposed system has superior performance to other systems in terms of speed and accuracy Therefore, it is proved that proposed system provided a friendly and convenient interface ... al [3], (c) Nav Chair [14] Trang 3system more comfortable and more adaptable for theseverely disabled when compared to conventional meth-ods The proposed IW system consists of Facial Feature ... vision system A data acquisition board (DAQ-board) is used to process the sensor information and control the wheel-chair The DAQ-board and a vision system are connected via a serial port In our system,

Ngày tải lên: 19/06/2014, 08:20

... and distributed freely for any purposes (see copyright notice below). For information about publishing your research in EURASIP WCN go to Trang 2Resource reservation for mobile hotspots in vehicular ... According to the performance evaluation, we can derive the required channel bandwidth for such a mobilehotspot Numerical results are presented to demonstrate the application for bandwidth reservation, ... are ever-increasing demands for systematic deployment of moving networks in a vehicular environment such as public transits (e.g., a bus, train, or airplane) For mobile hotspots in a vehicularenvironment,

Ngày tải lên: 20/06/2014, 20:20

... One of the key factors for the successful deployment of mobile satellite systems in 4G networks is the maximization of the technology commonalities with the terrestrial systems An effective way ... achievable by the integrated system In order to replicate in 4G networks the success of the integrated mobile broadcasting systems, many initiatives are being carried out [2,3] for the design of a satellite ... the perspective for the introduction of advanced solutions for the adaptation to satellite links, as described inSection 3 The FEC technique adopted by LTE for processing the information data

Ngày tải lên: 21/06/2014, 23:20