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Chapter 4 WAN
3G
3G (Third Generation) is a digital, packet-switched wireless technology. Bandwidth usage is
optimized as multiple users share the same channel and bandwidth is only allocated to users when
they send data. It allows fast transfer of voice and non-voice data and provides broadband Internet
access to mobile devices.
4G
4G is the fourth generation of the mobile telecommunications technology and a successor of 3G.
Both the WiMAX and Long Term Evolution (LTE) standards are the 4G candidate systems. 4G only
supports all-IP-based packet-switched telephony services and is required to offer gigabit speed
access.
Note: The actual data rate you obtain varies depending on your mobile environment. The
environmental factors may include the number of mobile devices which are
currently connected to the mobile network, the signal strength to the mobile
network, and so on.
See the following table for a comparison between mobile telecommunications technologies.
Table 13 Mobile Telecommunications Technologies/Standards
MOBILE PHONE AND DATA STANDARDS
NAME
TYPE
GSM-BASED
2G
Circuit-
GSM (Global System for Mobile
switched
Communications), Personal Handy-
phone System (PHS), etc.
2.5G
Packet-
GPRS (General Packet Radio Services),
switched
High-Speed Circuit-Switched Data
(HSCSD), etc.
2.75G
Packet-
Enhanced Data rates for GSM Evolution
switched
(EDGE), Enhanced GPRS (EGPRS), etc.
3G
Packet-
UMTS (Universal Mobile
switched
Telecommunications System), a third-
generation (3G) wireless standard
defined in ITU
sometimes marketed as 3GSM. The
UMTS uses GSM infrastructures and W-
CDMA (Wideband Code Division
Multiple Access) as the air interface.
3.5G
Packet-
HSDPA (High-Speed Downlink Packet
switched
Access) is a mobile telephony protocol,
used for UMTS-based 3G networks and
allows for higher data transfer speeds.
4G/LTE
Packet-
The LTE (Long Term Evolution)
switched
standard is based on the GSM and
UMTS network technologies.
34
A
specification, is
CDMA-BASED
Interim Standard 95 (IS-95), the first CDMA-
based digital cellular standard pioneered by
Qualcomm. The brand name for IS-95 is
cdmaOne. IS-95 is also known as TIA-EIA-95.
CDMA2000 is a hybrid 2.5G / 3G protocol of
mobile telecommunications standards that use
CDMA, a multiple access scheme for digital radio.
CDMA2000 1xRTT (1 times Radio Transmission
Technology) is the core CDMA2000 wireless air
interface standard. It is also known as 1x, 1xRTT,
or IS-2000 and considered to be a 2.5G or 2.75G
technology.
CDMA2000 EV-DO (Evolution-Data Optimized,
originally 1x Evolution-Data Only), also referred
to as EV-DO, EVDO, or just EV, is an evolution of
CDMA2000 1xRTT and enables high-speed
wireless connectivity. It is also denoted as IS-856
or High Data Rate (HDR).
DATA
SPEED
Slow
Fast
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