Gsm Gprs And Umts
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GSM, GPRS, UMTS
Page 1 of 3
Tutorials' Radio> Wireless: GSM, GPRS and UMTS
Mobile phone: GSM, GPRS and UMTS The mobile telephone systems can be classified into different generations depend the degree of technical evolution of the same. The key features of each of these generations are summarized below.
First generation (1G) It is the oldest of all, also known in Spain as TACS (Total Access Communications System), and encompasses all those analog mobile communications technologies. TACS system is a communication system for mobile cellular duplex in the 900 MH band, with the capacity to transmit voice but not data. The precursor to the TACS system was the system AMPS (American Mobile Phone System), developed in the by Bell Laboratories and put into service in the first half of the 80s. Subsequently AMPS system was adapted to European requirements for the UK (particularly with respect to frequency bands and channel) and put into service in 1985 under the n of the TACS system. Since the TACS standard only defines the radio access proto between a mobile station and its corresponding base station, and does not cover aspects relating to the management of mobility, came across a number of differen standards in different countries NTT-MTS (Japan ), MNT (Scandinavia) and C450 (Germany), with the corresponding problems of incompatibility. It is now obsolet will soon disappear.
The second generation (2G) The limitations of the first generation of mobile telephony led to the development of GSM (Global System for Mobile Communications). GSM is a digital technology whose first feature is the transmission of voice, but it also allows data transmission at low speed: 9.6 kbit / s. This speed is clearly insufficient when compared to the 56 kbit / s which allows a conventional modem Internet access through the phone line, yet it has allowed the absolute success of the service for sending short messages (SMS), surpassing by far the best expectations that the operators could have imagined. This fact has opened a huge market unknown to date and will be enhanced with future generations of mobile telephony. The European GSM system operates in around 900 MHz, while also emerged a variant known as DCS (Digital Cellular System) who works at 1800 MHz and whose goal is to provide greater capacity in urban ar Unlike the system TACS, GSM defines a complete system that includes not only th a complete network architecture, which allows for the development of a multitude GSM standard. Although prepared for data transmission, GSM is a standard desig Therefore, the original concept of deriving a standard set of limitations for applica transmission, such as: establishment of the slow connection (system-oriented con symmetry of the link (same bandwidth for each direction of communication), cost
Second generation and a half (2.5G) This includes all those digital mobile communications technologies that enable greater data transmission capacity and which emerged as a precursor to 3G. Mobile phone operators in Europe and the United States began moving to 2.5G
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
GSM, GPRS, UMTS
Page 2 of 3
in 2001, while Japan took the leap directly from 2G to 3G. One such technology is 2.5G GPRS (General Packet Radio System), based on packet transmission and w channels are shared among different users in a dynamic way. GPRS coexists with the infrastructure deployed in it, but offering the user a more efficient service car communications, especially in the case of access to IP networks like the Internet. theoretical speed that can reach GPRS is 171.2 kbit / s (about 18 times higher tha speed experienced by the user in practice is influenced by various factors and can kbit / s in the downlink and 9.6 kbit / s on the rise. The main advantages are GPR addition to a higher speed transmission, connection and charging for traffic, maki WAP services, Internet access (Web browsing, FTP, e - mail) and access to enterp other hand, HSCSD (High Speed Circuit Switched Data) is a specification of the GS standardized by ETSI (European Telecommunications Standards Institute) in Febr from 1999. With this technology, the number of channels used in GSM equivalent data communication is variable, allowing transmission speeds of up to 57.6 kbit / HSCSD is that investment to be implemented is minimal, although it has a disadv users, paid for by the use of each channel. Finally, technology EDGE (Enhanced D Evolution) is another of the development of GSM networks, theoretically allowing kbit / s. This is a technology that improves the bandwidth of data transmission in be regarded as a precursor to UMTS. In fact, EDGE and UMTS are complementary together may give support to the needs of the operators to achieve global coverag generation networks.
Third-generation (3G) 3G technologies are contained within the IMT-2000 (International Mobile Telecommunications-2000) of the ITU, which can be regarded as the guide to mark the common points that must be met to achieve the goal of global roaming, ie that a 3G terminal user can communicate with any 3G network in the world. The services offered by 3G technologies are basically: Internet access, broadband services, international roaming and interoperability. But fundamentally, these systems allow the development of multimedia environments for the transmission of video and images in real time, encouraging the emergence of new applications and services such as videoconferencing or electronic commerce. Precisely UMTS (Universal Mobile Telecommunications System) is one of the members of this family of IMT-2000 standard. Among the attributes of UMTS can be highlighted: virtual connectivity to the network all the time, different forms of pricing, asymmetric ba down, setting the quality of service (QoS), integration of technology and standard networks, customized services environment, and many others. In terms of data t of 3G technologies, you can set different work environments, even up to 2 Mbit / operation, such as the environment inside an office. This capability is far superior technologies, enabling the development of multimedia genuine.
Other articles and news on mobile phones "The future of mobile cellular communications systems "Measures of RF test equipment in GSM We recommend:
RADIO Course with hundreds of questions and exercises self for the practical desig
More recommended books ... UMTS/3G - Books
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
GSM, GPRS, UMTS
Page 3 of 3
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© 1998-2008 Radioptica.com. All rights reserved. No reproduction in whole or part of the contents of this site without prior authorization Optimized for Internet Explorer, 1024x768 resolution.
Company Directory Job Offers Useful links Recommended Books Telecom Books Radio Tutorials and articles Calculation Radio Workshop Fiber optic Tutorials and articles Optic connectors Technologies Quick ... About the author Teaching and Training Research Publications Brief Curriculum Contact Radio
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
Page 1 of 3
Tutorials' Radio> Wireless: GSM, GPRS and UMTS
Mobile phone: GSM, GPRS and UMTS The mobile telephone systems can be classified into different generations depend the degree of technical evolution of the same. The key features of each of these generations are summarized below.
First generation (1G) It is the oldest of all, also known in Spain as TACS (Total Access Communications System), and encompasses all those analog mobile communications technologies. TACS system is a communication system for mobile cellular duplex in the 900 MH band, with the capacity to transmit voice but not data. The precursor to the TACS system was the system AMPS (American Mobile Phone System), developed in the by Bell Laboratories and put into service in the first half of the 80s. Subsequently AMPS system was adapted to European requirements for the UK (particularly with respect to frequency bands and channel) and put into service in 1985 under the n of the TACS system. Since the TACS standard only defines the radio access proto between a mobile station and its corresponding base station, and does not cover aspects relating to the management of mobility, came across a number of differen standards in different countries NTT-MTS (Japan ), MNT (Scandinavia) and C450 (Germany), with the corresponding problems of incompatibility. It is now obsolet will soon disappear.
The second generation (2G) The limitations of the first generation of mobile telephony led to the development of GSM (Global System for Mobile Communications). GSM is a digital technology whose first feature is the transmission of voice, but it also allows data transmission at low speed: 9.6 kbit / s. This speed is clearly insufficient when compared to the 56 kbit / s which allows a conventional modem Internet access through the phone line, yet it has allowed the absolute success of the service for sending short messages (SMS), surpassing by far the best expectations that the operators could have imagined. This fact has opened a huge market unknown to date and will be enhanced with future generations of mobile telephony. The European GSM system operates in around 900 MHz, while also emerged a variant known as DCS (Digital Cellular System) who works at 1800 MHz and whose goal is to provide greater capacity in urban ar Unlike the system TACS, GSM defines a complete system that includes not only th a complete network architecture, which allows for the development of a multitude GSM standard. Although prepared for data transmission, GSM is a standard desig Therefore, the original concept of deriving a standard set of limitations for applica transmission, such as: establishment of the slow connection (system-oriented con symmetry of the link (same bandwidth for each direction of communication), cost
Second generation and a half (2.5G) This includes all those digital mobile communications technologies that enable greater data transmission capacity and which emerged as a precursor to 3G. Mobile phone operators in Europe and the United States began moving to 2.5G
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
GSM, GPRS, UMTS
Page 2 of 3
in 2001, while Japan took the leap directly from 2G to 3G. One such technology is 2.5G GPRS (General Packet Radio System), based on packet transmission and w channels are shared among different users in a dynamic way. GPRS coexists with the infrastructure deployed in it, but offering the user a more efficient service car communications, especially in the case of access to IP networks like the Internet. theoretical speed that can reach GPRS is 171.2 kbit / s (about 18 times higher tha speed experienced by the user in practice is influenced by various factors and can kbit / s in the downlink and 9.6 kbit / s on the rise. The main advantages are GPR addition to a higher speed transmission, connection and charging for traffic, maki WAP services, Internet access (Web browsing, FTP, e - mail) and access to enterp other hand, HSCSD (High Speed Circuit Switched Data) is a specification of the GS standardized by ETSI (European Telecommunications Standards Institute) in Febr from 1999. With this technology, the number of channels used in GSM equivalent data communication is variable, allowing transmission speeds of up to 57.6 kbit / HSCSD is that investment to be implemented is minimal, although it has a disadv users, paid for by the use of each channel. Finally, technology EDGE (Enhanced D Evolution) is another of the development of GSM networks, theoretically allowing kbit / s. This is a technology that improves the bandwidth of data transmission in be regarded as a precursor to UMTS. In fact, EDGE and UMTS are complementary together may give support to the needs of the operators to achieve global coverag generation networks.
Third-generation (3G) 3G technologies are contained within the IMT-2000 (International Mobile Telecommunications-2000) of the ITU, which can be regarded as the guide to mark the common points that must be met to achieve the goal of global roaming, ie that a 3G terminal user can communicate with any 3G network in the world. The services offered by 3G technologies are basically: Internet access, broadband services, international roaming and interoperability. But fundamentally, these systems allow the development of multimedia environments for the transmission of video and images in real time, encouraging the emergence of new applications and services such as videoconferencing or electronic commerce. Precisely UMTS (Universal Mobile Telecommunications System) is one of the members of this family of IMT-2000 standard. Among the attributes of UMTS can be highlighted: virtual connectivity to the network all the time, different forms of pricing, asymmetric ba down, setting the quality of service (QoS), integration of technology and standard networks, customized services environment, and many others. In terms of data t of 3G technologies, you can set different work environments, even up to 2 Mbit / operation, such as the environment inside an office. This capability is far superior technologies, enabling the development of multimedia genuine.
Other articles and news on mobile phones "The future of mobile cellular communications systems "Measures of RF test equipment in GSM We recommend:
RADIO Course with hundreds of questions and exercises self for the practical desig
More recommended books ... UMTS/3G - Books
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
GSM, GPRS, UMTS
Page 3 of 3
Homepage | Add to Favorites | Recommend this page | Contact | Advertise | Stats | Sitem Exchange links | Telecommunication books Radioptica.com News Congress Agenda
© 1998-2008 Radioptica.com. All rights reserved. No reproduction in whole or part of the contents of this site without prior authorization Optimized for Internet Explorer, 1024x768 resolution.
Company Directory Job Offers Useful links Recommended Books Telecom Books Radio Tutorials and articles Calculation Radio Workshop Fiber optic Tutorials and articles Optic connectors Technologies Quick ... About the author Teaching and Training Research Publications Brief Curriculum Contact Radio
file://C:\Documents%20and%20Settings\Administrator.DIGANTA\Desktop\GSM,%20GPRS,%20UMTS_fil... 11/26/2008
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