2.5G (GPRS)2.5G ("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.
The first major step in the evolution of GSM networks to 3G occurred with the
introduction of General Packet Radio Service (GPRS). CDMA2000 networks similarly evolved through the
introduction of 1xRTT.
The combination of these capabilities came to be known as 2.5G.
GPRS could provide data rates from 56 kbit/s up to 115 kbit/s. It can be used
for services such as Wireless Application Protocol
(WAP) access, Multimedia Messaging Service (MMS), and for Internet communication
services such as email and World Wide Web access. GPRS data transfer is
typically charged per megabyte of traffic transferred, while data communication
via traditional circuit switching is billed per minute of connection time,
independent of whether the user actually is utilizing the capacity or is in an
idle state.
1xRTT supports bi-directional (up and downlink) peak data rates up to
153.6 kbit/s, delivering an average user data throughput of 80-100 kbit/s in
commercial networks.[3] It can also be used
for WAP, SMS & MMS services, as well as Internet access.
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