Some Mobile or Cellular Phone Technology Definitions
G stands for Generation and is related to data transmission speed
1G - Original analog cellular for voice (AMPS, NMT, TACS) 14.4 kbps
2G - Digital narrowband circuit data (TDMA, CDMA) 9-14.4 kbps
2.5G - Packet data onto a 2G network (GPRS, EDGE) 20-40 kpbs
3G - Digital broadband packet data (CDMA, EV-DO, UMTS, EDGE) 500-700 kbps
3.5G - Replacement for EDGE is HSPA 1-3 mbps and HSDPA up to 7.2Mbps
4G - Digital broadband packet data all IP (Wi-Fi, WIMAX, LTE) 3-5 mbps
5G - Gigabit per second in a few years (?) 1+ gbps
GPRS (General Packet Radio Service)
A Global System for Mobile Communications (GSM) initiative to deliver high speed packet data services to mobile terminals. GPRS allows many users to share the same channel and allows users to stay virtually 'on line' all of the time; radio resources are used only when data is actually being transmitted or received. Call setup is almost instantaneous and users may be charged on the basis of actual data transmitted, rather than connection time. Sometimes defined as GSM Packet Radio Service.
EDGE (Enhanced Data rate for Global Evolution)
A technology (also known as GSM++) that allows Global System for Mobile Communications (GSM) operators to use existing GSM radio bands to offer wireless multimedia IP-based services and applications at speeds of 384 kbps with a bit-rate of 48 kbps per timeslot and up to 69.2 kbps per timeslot under ideal radio conditions. (A more realistic theoretical limit is 59.2 kbps per timeslot). The 384 kbps prediction is from an International Telecommunication Union (ITU)-defined objective in the ITU2000 standard. EDGE is fully based on GSM and requires relatively small changes to network hardware and software. For example, EDGE uses the same time division multiple access (TDMA) frame structure, logic channel, and 200-kHz carrier bandwidth as today's GSM networks, allowing existing cell plans to remain intact. Formerly called Enhanced Data rate for GSM Evolution.
What that means in simple English is that when you connect to the internet via your mobile phone, if EDGE is available, sites should appear (data download to your phone) faster than just standard GPRS.
In theory EDGE is twice
the speed of GPRS.
You might see a small icon on your phone screen that
indicates that GPRS and/or EDGE is operating. There's no need to add special
settings to your connection.
3G (third generation wireless)
3G is an ITU specification for the third generation of mobile communications technology. (Analog cellular was the first generation; Digital PCS the second.) 3G uses the Universal Mobile Telecommunications System (UMTS) standard. Key features of 3G systems are a high degree of commonality of design worldwide, compatibility of services, use of small pocket devices with worldwide roaming capability, Internet and other multimedia applications, and a wide range of services and devices.
The main difference between 2.5G and 3G wireless is the rate at which data can be transferred. Planned rates are: 144 kbps or higher in high mobility (vehicular) traffic, 384 kbps for pedestrian traffic, and 2 Mbps or higher in fixed applications or for indoor traffic. The EDGE (Enhanced Data rates for Global Evolution) air interface was developed specifically to meet the bandwidth needs of 3G.
3.5G - HSPA (High-Speed Packet Access) offered by some mobile operators, requires a special modem, built into some notebooks and also available as a USB dongle. Speeds up to 3.6 Mbps.
HSDPA (High-Speed Downlink Packet Access) boosts speeds to as much as 7.2 Mbps, with 14.4 Mbps speeds possible in the near future.
HSDPA is five times faster than EDGE and ten times faster than GPRS.
4G - Digital broadband packet data all IP (Wi-Fi, WIMAX, LTE) 3-5 Mbps
5G - Gigabit per second - for the future: 1+ Gbps
(data from multiple sources)
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