A Wisdom Archive on Gsm Frequency Ranges

There are five frequency bands used by GSM mobile phones: GSM-900 GSM-1800 GSM-850 GSM-1900 GSM-422 GSM frequency ranges - GSM-900 and GSM-1800. GSM-900 and GSM-1800 are used in most of the world. GSM-900 uses 890 - 915 MHz to send information from the Mobile Station to the Base Transceiver Station (uplink) and 935 - 960 MHz for the other direction (downlink), providing 124 RF channels ...

Read more here: » GSM frequency ranges: Encyclopedia II - GSM frequency ranges - GSM frequency bands

The network behind the GSM system seen by the customer is large and complicated in order to provide all of the services which are required. It is divided into a number of sections and these are each covered in separate articles. the Base Station Subsystem (the base stations and their controllers). the Network and Switching Subsystem (the part of the network most similar to a fixed network). This is sometimes also just called the core network. the GPRS Core Network (the optional part which allows packet based Internet connections). all of the elements in the sy ...

Read more here: » Global System for Mobile Communications: Encyclopedia II - Global System for Mobile Communications - Network structure

Throughout the evolution of cellular telecommunications, various systems were developed without the benefit of standardized specifications. This presented many problems directly related to compatibility, especially with the development of digital radio technology. In 1982, The GSM group ("Groupe Spécial Mobile" (French) 1, 2, 3 and 4) was formed to address these problems. The name of the system comes from the name of this group, though later the decision was made to keep the initials but to c ...

Read more here: » Global System for Mobile Communications: Encyclopedia II - Global System for Mobile Communications - History

More than 1.6 billion people use GSM phones as of 2005, making GSM the dominant mobile phone system worldwide with about 70% of the world's market. GSM's main competitor, cdmaOne, is used primarily in North America and [2] parts of Asia. cdmaOne also benefited from increased radio spectrum efficiencies as compared to the more common GSM networks. Roaming with GSM phones is a major advantage over the competing technology as roaming across CDMA networks from different operators i ...

Read more here: » Global System for Mobile Communications: Encyclopedia II - Global System for Mobile Communications - Market situation

More than one billion people use GSM phones as of 2005, making GSM the dominant mobile phone system worldwide with about 70% of the world's market. GSM's main competitor, cdmaOne, is used primarily in North America and [2] parts of Asia. cdmaOne also benefited from increased radio spectrum efficiencies as compared to the more common GSM networks. Roaming with GSM phones is a major advantage over the competing technology as roaming across CDMA networks from different operators i ...

Read more here: » Global System for Mobile Communications: Encyclopedia II - Global System for Mobile Communications - Market situation

GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity. GSM networks operate at various different radio frequencies. Most GSM networks operate at 900 MHz or 1800 MHz. The exception to the rule are networks in parts of the Americas (including the USA and Canada) that operate at 850 MHz or 1900 MHz. In the 900 MHz band the uplink frequency band is 890-915 MHz, and the downlink frequency band is 935-960 MHz. This 25 MHz bandwidth is subdivided into 124 carrier frequencies, ...

Read more here: » Global System for Mobile Communications: Encyclopedia II - Global System for Mobile Communications - Radio interface

The following information does not apply to non-UMTS systems that use the W-CDMA air interface, such as FOMA UMTS combines the W-CDMA air interface, GSM's Mobile Application Part (MAP) core, and the GSM family of speech codecs. Note that many wireless technologies use W-CDMA as their air interface, including FOMA and J-Phone. Like other real-world W-CDMA implementations, UMTS uses a pair of 5 MHz channels, one in the 1900 MHz range for uplink and one in the 2100 MHz range for downlink. In contrast, the competing C ...

Read more here: » Universal Mobile Telecommunications System: Encyclopedia II - Universal Mobile Telecommunications System - Technology

AMPS is the most extensive and reliable wireless coverage available for nationwide service. Even today, analog continues to provide the widest range of coverage across the U.S. and Canada. However, in 2002, the FCC made the drastic desicion to no longer require A and B carriers to support AMPS cellular service as of March 1, 2008. Since the AMPS standard is analog technology, it suffers from an inherently inefficient use of the frequency spectrum. All AMPS carriers have converted most of their consumer base to a digital standard such as CDMA ...

Read more here: » Advanced Mobile Phone System: Encyclopedia II - Advanced Mobile Phone System - The Future of AMPS

Universal Mobile Telecommunications System (UMTS) is one of the third-generation (3G) mobile phone technologies. It uses W-CDMA as the underlying standard, is standardized by the 3GPP, and represents the European/Japanese answer to the ITU IMT-2000 requirements for 3G Cellular radio systems. To differentiate UMTS from competing network technologies, UMTS is sometimes marketed as 3GSM, emphasizing the combination of the 3G nature of the technology and the GSM standard which it was designed to succeed. Univer ... Including:

• Universal Mobile Telecommunications System - Preface
• Universal Mobile Telecommunications System - Features
• Universal Mobile Telecommunications System - Real-world implementations
• Universal Mobile Telecommunications System - Technology
• Universal Mobile Telecommunications System - Interoperatibility and global roaming
• Universal Mobile Telecommunications System - Spectrum allocation
• Universal Mobile Telecommunications System - Other competing standards
• Universal Mobile Telecommunications System - Problems and issues

Read more here: » Universal Mobile Telecommunications System: Encyclopedia - Universal Mobile Telecommunications System

Another common example of a cellular network are mobile phone networks. A mobile phone is a portable telephone which receives or makes calls through a Cell site, or transmitting tower. Radio waves are used to transfer signals to and from the cell phone. Large geographic areas (representing the coverage range of a service provider) are split up into smaller cells to deal with line-of-sight signal loss and the large number of active phones in an area. Each cell site has a range of 3-15 miles and overlaps other cell sites. All of the cell sites are connected to one or more cellular switching exchanges which can detect ...

Read more here: » Cellular network: Encyclopedia II - Cellular network - Cellular telephony

In the 1990s, second generation (2G) mobile phone systems such as GSM, IS-136 ("TDMA"), iDEN and IS-95 ("CDMA") began to be introduced. The first digital cellular phone call was made in the United States in 1990, in 1991 the first GSM network opened in Europe. 2G phone systems were characterised by digital circuit switched transmission and the introduction of advanced and fast phone to network signalling. In general the frequencies used by 2G systems in Europe were higher though with some overlap, for example the 900 MHz frequency ran ...

Read more here: » History of mobile phones: Encyclopedia II - History of mobile phones - Second Generation