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Differentiating Between Wireless Technologies
WWAN (Wireless Wide Area Network)
A WWAN utilizes mobile cellular communication networks such as cellular, UMTS, GPRS, CDMA2000, GSM,
CDPD, Mobitex, HSDPA, 3G, and WiMax. All of these networks offer wide service coverage and are normally
used for citywide, nationwide, or even global digital data exchange. Cellular networks in particular are operated
by carriers such as Cingular Wireless, Vodafone, and Verizon Wireless. In cellular communication, GSM (Global
System for Mobile Communication) is the leader with over 80% market share, followed by CDMA (Code
Division Multiple Access).
CDPD, Mobitex, HSDPA, 3G, and WiMax. All of these networks offer wide service coverage and are normally
used for citywide, nationwide, or even global digital data exchange. Cellular networks in particular are operated
by carriers such as Cingular Wireless, Vodafone, and Verizon Wireless. In cellular communication, GSM (Global
System for Mobile Communication) is the leader with over 80% market share, followed by CDMA (Code
Division Multiple Access).
The biggest issues regarding data exchange over a WWAN are the associated costs, bandwidth, and IP
management. However, as technologies improve and costs drop, WWAN is predicted to replace traditional
microwave, RF (radio frequency), and satellite communication due to its lower infrastructure costs.
management. However, as technologies improve and costs drop, WWAN is predicted to replace traditional
microwave, RF (radio frequency), and satellite communication due to its lower infrastructure costs.
NOTE: The term “cellular” is also used to refer WWAN technology in general. WWAN technologies are
discussed in detail Chapter 3.
discussed in detail Chapter 3.
WLAN (Wireless Local Area Network)
As suggested by its name, WLAN transmits data over a shorter distance, normally 100 meters or so. In
terms of transmission technology, WLAN uses spread-spectrum or OFDM (Orthogonal frequency-division
multiplexing) modulation technology to provide the convenience of exchanging data without the limitation of
cables.
terms of transmission technology, WLAN uses spread-spectrum or OFDM (Orthogonal frequency-division
multiplexing) modulation technology to provide the convenience of exchanging data without the limitation of
cables.
Today’s WLANs are based on IEEE 802.11 standards and are referred to as Wi-Fi networks. The 802.11b
standard, which operates around the 2.4 GHz frequency band at 11 Mbps, was the first commercialized
wireless technology. Advances in wireless technology have made a higher transmission rate of 54 Mbps
possible with 802.11g, which also operates around 2.4 GHz, and 802.11a, which operates around the 5 GHz
frequency band. It is now very common to see dual-band Wi-Fi access points and client network adaptors that
support a mixture of 802.11a, b, and g standards. More bandwidth means that it is possible to use wireless to
replace traditional wired solutions to transmit larger data such as video.
NOTE: WLAN technologies are discussed in detail Chapter 2.
standard, which operates around the 2.4 GHz frequency band at 11 Mbps, was the first commercialized
wireless technology. Advances in wireless technology have made a higher transmission rate of 54 Mbps
possible with 802.11g, which also operates around 2.4 GHz, and 802.11a, which operates around the 5 GHz
frequency band. It is now very common to see dual-band Wi-Fi access points and client network adaptors that
support a mixture of 802.11a, b, and g standards. More bandwidth means that it is possible to use wireless to
replace traditional wired solutions to transmit larger data such as video.
NOTE: WLAN technologies are discussed in detail Chapter 2.
Differentiating Between Wireless Technologies
Chapter 1
Modem wireless technologies are developed for the growing demand in mobile data exchange. Since
demands vary depending on the application, different technologies are applied to meet specific needs.
Normally, wireless technologies are divided into three categories: WWAN, WLAN and WPAN.
demands vary depending on the application, different technologies are applied to meet specific needs.
Normally, wireless technologies are divided into three categories: WWAN, WLAN and WPAN.
1.1 WWAN vs. WLAN vs. WPAN