7.1 Wireless Technologies:
· Wireless devices: are small devices which produced for people who travel from one
place to another. It will save and allocate their time between personal and
professional obligations.
o
Capabilities of Wireless Devices:
§ Bluetooth, Wi- Fi, Digital Camera, GPS, QWERTY keyboard…
·
Wireless Transmission Media:
o
Microwave transmission systems
o
Satellite transmission:
§ Geostationary (GEO)
§ Medium-earth-orbit (MEO)
§ Low-earth-orbit (LEO)
o
Radio transmission
o
Infrared: red light that
is not visible for human eyes and it is used in remote control in VCR.DVD and
CD.
7.2 Wireless Computer Networks and Internet Access:
·
Short range wireless networks:
o
Bluetooth.
o
Ultra Wideband Network (UWB).
o
Near Field Communication Network (NFC).
·
Medium range wireless networks:
o
Wireless Fidelity (Wi-Fi).
o
Wireless Mesh Networks.
·
Wide area wireless networks:
o
Cellular Radio:
§ 1st Generation: analog signals and low bandwidth.
§ 2nd Generation: digital signals for voice and data communication
up to 10 Kbps.
§ 2.5 Generation: digital
voice and data communication up to 144 Kbps.
§ 3rd
Generation: digital voice and data communication up to 384 Kbps.
o
Wireless Broadband or WIMAX: is
more secured and can access to rural areas.
7.3 Mobile Computing and Mobile Commerce:
· Mobile computing: designed for people who travel and do their work from anywhere. It
has 2 characteristics:
o
Mobility: they can carry
the mobile device to any place.
o
Broad reach: when they
carry an open mobile, they can be reached even they are in a great distance.
o
These
two characteristics created five value-added attributes that break the barriers
of geography and time:
§ Ubiquity
§ Convenience
§ Instant connectivity
§ Personalization
§ Localization of products and services
· Mobile Commerce: is driven by 5 factors, which are:
o
Widespread
availability of mobile devices.
o
No
need for a PC.
o
The
“Cell phone culture”.
o
Declining
prices.
o
Bandwidth
improvement.
·
Mobile Commerce Applications:
o
Financial Services:
o
Mobile
Banking
o
Wireless
Electronic Payment Systems
o
Micropayments
o
Mobile
(Wireless) Wallets
o
Wireless
Bill Payments
o
Intra business Applications
o
Accessing Information via:
§ Mobile Portal
§ Voice Portal
o
Location-Based Applications:
o
Shopping
from Wireless Devices.
o
Location-based
Advertising.
o
Location-based
Services.
o
Wireless Telemedicine.
o
Telemetry Application.
7.4 Pervasive Computing:
· Radio frequency
identification (RFID): technology
allows manufacturers to attach tags with antennas and computer chips on goods
and then track their movement through radio signals.
· Wireless sensor
networks (WSNs): are networks
of interconnected, battery-powered, wireless sensors that are placed into the
physical environment.
7.5 Wireless Security:
·
major threats to wireless networks:
o
Rogue access point: is an
unauthorized access point to a wireless network.
o
War driving: is the act of
locating WLANs while driving around a city or elsewhere.
o
Eavesdropping: refers to
efforts by unauthorized users to try to access data traveling over wireless
networks.
o
RF (Radio frequency) jamming: is
when a person or a device intentionally or unintentionally interferes with your
wireless network transmissions.
very interesting..
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