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{{Refimprove|date=October 2007}}
{{Refimprove|date=October 2007}}
'''2.5G''' is a stepping stone between [[2G]] and [[3G]] cellular wireless technologies. The term "second and a half generation" is used to describe 2G-systems that have implemented a packet switched domain in addition v to the circuit switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit switched data services ([[HSCSD]]) as well.
'''2.5G''' is a stepping stone between [[2G]] and [[3G]] cellular wireless technologies. The term "second and a half generation" is used to describe 2G-systems that have implemented a packet switched domain in addition to the circuit switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit switched data services ([[HSCSD]]) as well.


2.5G provides some of the benefits of 3G (e.g. it is packet-switched) and can use some of the existing 2G infrastructure in [[GSM]] and [[CDMA]] networks. [[GPRS]] is a 2.5G technology used by [[GSM]] operators. Some protocols, such as [[Enhanced Data Rates for GSM Evolution|EDGE]] for GSM and [[CDMA2000|CDMA2000 1x-RTT]] for CDMA, can qualify as "3G" services (because they have a data rate of above 144 kbit/s), but are considered by most to be 2.5G services (or [[2.75G]] which sounds even more sophisticated) because they are several times slower than "true" 3G services.
2.5G provides some of the benefits of 3G (e.g. it is packet-switched) and can use some of the existing 2G infrastructure in [[GSM]] and [[CDMA]] networks. [[GPRS]] is a 2.5G technology used by [[GSM]] operators. Some protocols, such as [[Enhanced Data Rates for GSM Evolution|EDGE]] for GSM and [[CDMA2000|CDMA2000 1x-RTT]] for CDMA, can qualify as "3G" services (because they have a data rate of above 144 kbit/s), but are considered by most to be 2.5G services (or [[2.75G]] which sounds even more sophisticated) because they are several times slower than "true" 3G services.

Revision as of 01:30, 16 September 2009

2.5G is a stepping stone between 2G and 3G cellular wireless technologies. The term "second and a half generation" is used to describe 2G-systems that have implemented a packet switched domain in addition to the circuit switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit switched data services (HSCSD) as well.

2.5G provides some of the benefits of 3G (e.g. it is packet-switched) and can use some of the existing 2G infrastructure in GSM and CDMA networks. GPRS is a 2.5G technology used by GSM operators. Some protocols, such as EDGE for GSM and CDMA2000 1x-RTT for CDMA, can qualify as "3G" services (because they have a data rate of above 144 kbit/s), but are considered by most to be 2.5G services (or 2.75G which sounds even more sophisticated) because they are several times slower than "true" 3G services.

See also

References

  • Fundamentals of Cellular Network Planning and Optimisation: 2G/2.5G/3G ... Evolution to 4G, by Ajay R. Mishra, John Wiley and Sons, 2004, ISBN 047086267X
  • "2.5G Technology  Experts and Case Studies - Page 1". ims-expertservices.com. Archived from the original on 2009-05-28. Retrieved 2009-05-26. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
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