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internet connectivity for private purposes and public facilities as well.
One strongest advantage of Wi-Fi comparing to other data connections
such as WiMAX, HSDPA
and 3G is the wide availability of terminal
devices. Mostly all of
devices, smartphones,
laptops, motherboards,
even a smart-watch shipped today have built-in Wi-Fi interface.
2.2.7.
Mobile Data Network
With fully respects to Jaloun
and
Guennoun
(2010), the
history of mobile data
networks have been around in society for couple
decades
and evolved for more than 3 generations up to this moment,
precisely since the era of analogue network or 1G. Back then, the main
analogue systems in 1G era are Nordic Mobile Telephone, Advanced
Mobile Phone System (AMPS), Total Access Communications System
(TACS) and Cellular Digital Packet Data (CDPD). Moving from that
era, the second generation of network (2G) was the main hype of
mobile network back then. During this era, there are at least 3 most
well-known and used 2G radio interface, which are FDMA, CDMA and
TDMA (GSM).
The generation of 2.5G data service, known as General Packet
Radio Service (GPRS) was overlaid on an existing GSM network for
several years. In general, there are 3 types of 2.5G GSM system which
are High-speed circuit-switched data (HSCSD), General Packet Radio
Service (GPRS)
and
Enhanced Data Rates for Global Evolution
(EDGE).
In the early of 21st century, 3G (third generation) was brought
into market and was equipped by speeds up to 2MB/s. This system is
operated in the less crowded IMT-2000 core band, operating at 2GHz.
This era was remarked, again, by competition between WCDMA
and
CDMA2000 which is still happening up to this moment.
Nearly after 3G eras, 3.5G or mostly known as HSDPA was
launched. It came with more than 20Mbits/s, yet practically the data
speed is only 1Mbps. HSDPA or High Speed Downlink Packet Access
is basically an upgraded version of WCDMA in 3G and rumor has it
that HSDPA reduces latency to 100ms from 180-200ms. Aside from
HSDPA, another most famous 3.5G connection is CDMA2000 1xEV-
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