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The GSM Recommendation The early 1980s were marked by the development of a number of national and incompatible radio networks in Europe; see Table and Figure . The seven different mobile radio networks made the prospect of the mobile telephone unattractive to many potential customers because of high tariffs and equipment costs. For this reason, at its general meeting in Vienna in June 1982, CEPT (see Appendix ) decided to develop and standardize a Pan-European cellular mobile radio network. The aim was for the new system to operate in the 900 MHz frequency band allocated to land mobile radio | Mobile Radio Networks Networking and Protocols. Bernhard H. Walke Copyright 1999 John Wiley Sons Ltd ISBNs 0-471-97595-8 Hardback 0-470-84193-1 Electronic 3 GSM System The GSM Recommendation The early 1980s were marked by the development of a number of national and incompatible radio networks in Europe see Table and Figure . The seven different mobile radio networks made the prospect of the mobile telephone unattractive to many potential customers because of high tariffs and equipment costs. For this reason at its general meeting in Vienna in June 1982 CEPT see Appendix decided to develop and standardize a Pan-European cellular mobile radio network. The aim was for the new system to operate in the 900 MHz frequency band allocated to land mobile radio. A working group called Group Spécial Mobile GSM was set up under the direction of CEPT. There were no guidelines on how the new mobile radio system was to transmit analogue or digital speech and data. The decision to develop a digital GSM network was not made until the development stage. But it was agreed from the beginning that the system being planned called the GSM mobile radio system after the working group that developed it should incorporate and consider new technology from the area of telecommunications such as ITU-T Signalling System No. 7 ISDN and the ISO OSI reference model. Six working groups and three supporting groups were formed to cope with the enormity of the standardization work. The tasks of the different GSM working groups are listed in Table . The GSM objectives for its Public Land Mobile Network PLMN were to offer 1 A broad offering of speech and data services Compatibility with the wireline networks ISDN telephone networks data networks using standardized interfaces Cross-border system access for all mobile phone users Automatic roaming and handover Highly efficient use of frequency spectrum With the collaboration of Peter Decker and Christian Wietfeld 122 3 GSM System Table .

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