global system for mobile communications gsm technology

... (900) 35 35 124 10 10 45 2x7.2 2x7.2 2x25 460.4-467.6 488.8-496 869-894 450.4-457.6 478.8-486 824-849 GSM 450 GSM 480 GSM 850 Duplex channels Duplex Spacing BandDownlinkUplinkGSM systems GSM Time Division Multiplex Frame and Physical Channels TS ... time-slots BTS side MSs side BTS TDMA Frame (4.615 ms) 3 TOPICS ã GSM CONCEPTS ã GSM SYSTEM ARCHITECTURE ã IDENTITIES USED IN GSM ã GSM CHANNELS ã GSM RADIO LINK ã MOBILITY MANAGEMENT ã CALL MANAGEMENT ã ... messages ã International Mobile Equipment Identifier (IMEI) 38 GSM Architecture HLR VLR EIR AUC MSC B S C B S C SMSC PSTN VMSC Mobile Station GSM Air interface OMCR TRAU Base Station System Network and...

Ngày tải lên: 19/10/2013, 15:15

... Control MAHO Mobile Assisted Handover MA Mobile Allocation (of radio frequency channels) in GSM MAI Multiple Access Interference MAIO Mobile Allocation Index Offset (for frequency hopping in GSM) MBS Mobile ... which are discussed extensively in Chapter 4. For one 2G system called cdmaOne and most 3G systems, e.g. the Universal Mobile Telecommunications System (UMTS), DS/CDMA was chosen as a basic multiple ... Communication Systems 25 2.2.1 Analogue First Generation Cellular Systems 25 2.2.2 Digital Second Generation Systems 25 2.3 First 3G Systems 27 2.3.1 Requirements for 3G 27 2.3.2 Evolution of 2G Systems...

Ngày tải lên: 02/03/2013, 16:59

... (Release 99) Architecture. For readers familiar with the GSM, the MSC, G-MSC, HLR, and VLR (see Further reading for more information on GSM) are simply the normal GSM components but with added ... spectrally efficient that 1G. GSM (Global System for Mobile communication) has become the dominant 2G standard and roaming is now possible between 150+ countries where GSM is deployed. ã 3G - ... (number of systems [9]). 2G systems have not stood still and are introducing higher-speed packet data services (so- called 2.5G systems: the GSM 2.5G evolution is GPRS - GSM Packet Radio System) ....

Ngày tải lên: 27/10/2013, 17:15

... Center for Telecom- munications and Information Systems Laboratory, Stanford University, Stanford, CA, June 1994. [2] Second workshop on smart antennas in wireless mobile communications, Center for ... selection performance analysis of a switched multi-beamantenna systemin mobile communications environments, Stanford, CA,July 1995. Second workshop on Smart Antennas in Wireless Mobile Communications. [28] ... Telecom- munications and Information Systems Laboratory, Stanford University, Stanford, CA, July 20-21, 1995. [3] Third workshop on smart antennas in wireless mobile communications, Center for Telecom- munications...

Ngày tải lên: 16/12/2013, 04:15

... bandwidth and storage requirement. B. System performance vs. network resource We next evaluate the performance of our system. One major metric of the performance of our system is the message success rate, ... Sprite, a simple, cheat-proof, credit- based system for stimulating cooperation among selfish nodes in mobile ad hoc networks. Our system provides incentive for mobile nodes to cooperate and report actions ... discussed in Sec- tion III, although our system provides incentive for cooperation by giving more credit for forwarding a message, whether or not to forward a specific message will depend on the...

Ngày tải lên: 15/03/2014, 04:20

... Guaranteed Bit Rate GERAN GSM/ EDGE RAN GGSN Gateway GPRS Support Node GI Guard Interval GP Processing gain GPRS General Packet Radio Service GSM Global System for Mobile Communications HARQ Hybrid ... E-DCH Transport Format Combination E-TFCI E-DCH Transport Format Combination Indicator ECR Effective Code Rate EDGE Enhanced Data rates for GSM Evolution EDGE Enhanced Data Rate for Global Evolution EGPRS ... responsible for physical layer aspects; . TSG RAN WG2: responsible for layer 2 and 3 aspects; . TSG RAN WG3: responsible for RAN internal interfaces; . TSG RAN WG4: responsible for performance and...

Ngày tải lên: 01/06/2014, 09:38

Ngày tải lên: 27/06/2014, 15:20

Ngày tải lên: 04/07/2014, 08:31

... the system operation before the system is actually built. If the modeling process shows that the system performance is inadequate, then the design can be adjusted until the predicted performance ... processes the power in an effort to recover exactly the source information that was originally transmitting. For some systems this process can be quite complex, with methods for decoding signals, correcting ... transmitted source information is a broad general measure of the quality of the communication system and the success of the system design. 20 FIXED BROADBAND WIRELESS SYSTEMS challenges to system designers...

Ngày tải lên: 03/06/2014, 00:52

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 ... (2G) systems in the 1990s, such as Global Systems for Mobile Telecommunications (GSM) [1], Personal Digital Cellular (PDC) [2], and Interim Standard (IS)-95 [3], on digital technologies for voice-oriented ... present and future mobile communi- cations systems. As an evolutional form of mobile phone systems, Interna- tional Mobile Telecommunications (IMT)-2000 [4, 5], which corresponds to 3G systems, aims...

Ngày tải lên: 26/04/2013, 09:50

... (2G) systems in the 1990s, such as Global Systems for Mobile Telecommunications (GSM) [1], Personal Digital Cellular (PDC) [2], and Interim Standard (IS)-95 [3], on digital technologies for voice-oriented ... present and future mobile communi- cations systems. As an evolutional form of mobile phone systems, Interna- tional Mobile Telecommunications (IMT)-2000 [4, 5], which corresponds to 3G systems, aims ... 1 Introduction 1.1 Mobile Communications Systems: Past, Present, and Future There has been a paradigm shift in mobile communications systems every decade. The first generation (1G) systems in the...

Ngày tải lên: 20/01/2014, 23:20

... Propagation and Subsystems Research for the Evolution of Mobile Communications, ’’ IEEE Comm. Mag., Vol. 34, No. 2, February 1996, p. 58. [2] Prasad, R., Universal Wireless Personal Communications, ... Communication Systems and Techniques, New York: IEEE Press, 1996. [4] Jakes, Jr., C., Microwave Mobile Communications, New York: John Wiley & Sons, 1974. [5] Lee, W. C. Y., Mobile Communications ... written in a column vector form as S = [s (iT s + t spl ), ,s(iT s + qt spl ), ,s(iT s + N SC t spl )] T (3.8) = W − 1 (N SC )C i 28 Multicarrier Techniques for 4G Mobile Communications Figure 3.1...

Ngày tải lên: 20/01/2014, 23:20

... treating this kind of fluid for periodly collection. - For washing wastewater: To build a wastewater treatment system on the campus, which is based on treatment technologies for wastewater containing ... EMS for the involved subjects (staff and students - pupils). - To organize symposia on these topic for researchers and lecturers, instead of the one-way training form. - To organize forums ... internal and external information on the environment. - To plan the annual EMS internal audit for the whole campus. - To report on the EMS performance and to propose opportunities for the EMS improvement....

Ngày tải lên: 22/03/2014, 09:20

... personal health information system and the medical guidance. 1) Personal health information system: The personal health system can store physiological data and other information in the database ... a real-time mobile health monitoring system for the elderly. With the development of mobile computing and wireless sensor technology, combining smart phone, body sensors and web technology ... Our system is also a mobile health system for the elderly with tailored services depending on their personal health condition. However, it is not only a remote and real-time monitoring system...

Ngày tải lên: 28/03/2014, 19:21

Ngày tải lên: 03/06/2014, 01:37

Ngày tải lên: 19/06/2014, 08:20

Ngày tải lên: 21/06/2014, 11:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 24/08/2014, 17:56