CHAPTER 7 Wireless, Mobile Computing and Mobile Commerce
LEARNING OBJECTIVES • Discuss the various types of wireless devices and wireless transmission media. • Describe wireless networks according to their effective distance. • Define mobile computing and mobile commerce.
LEARNING OBJECTIVES (continued) • Discuss the major m-commerce applications. • Define pervasive computing and describe two technologies that underlie this technology. • Discuss the four major threats to wireless networks.
Wireless Technologies • Wireless devices – without wires • Mobile devices – location changes over time • Benefits? • Problems?
Capabilities of Wireless Devices Cellular telephony E-mail access Bluetooth Short message service Wi-Fi Instant messaging Digital camera Text messaging Global positioning system Organizer MP3 music player Scheduler Video player Address book Internet access Calculator QWERTY keyboard
Wireless Transmission Media • Infrared • Signals sent through air as light waves • Devices can be easily moved, relocated without wiring changes • Must have a line of site, objects can block transmission
Wireless Transmission Media (continued) • Radio • High bandwidth • Signals may pass through walls • Not Secure (anyone can hear or get signal) • Satellite Radio
Wireless Transmission Methods • Microwave transmission • Towers transmit data through air waves • No physical barriers, don’t need cable or wire • High bandwidth (fast) and relatively inexpensive • Must be within line of site – a direct path from tower to tower must be unblocked. Due to the curve of the earth, towers can’t be more then 30 miles apart. • Like sound and light, can bounce, be reflected, etc. • Could be impacted by weather and/or environment • Not secure!
Wireless Transmission Media • Satellite transmission • Can carry signal around the world • High bandwidth • One satellite can have one upload of data, but many downloads • Also restricted to line of sight • Expensive • Time lag - propagation delay (can be over 22,300 miles up and 22,300 miles down)
Wireless Transmission Media • Satellite transmission • Geostationary Orbit (GEO) • Medium Earth Orbit (MEO) • Low Earth Orbit (LEO) • Global Positioning System (GPS) • Internet Over Satellite (IOS)
Wireless Computer Networks and Internet Access • Short range wireless networks • Medium range wireless networks • Wide area wireless networks
Short Range Wireless Networks • Bluetooth • Ultra-wideband • Near-field Communications
Medium Range Wireless Networks • Wireless fidelity (Wi-Fi) • Wireless access point • Hotspot • Wireless network interface card • Benefits? • Problems?
Mobile Computing • Refers to real-time, wireless connection between a mobile device and other computing environments, such as the Internet and an intranet.
Mobile Computing • Value-added attributes that break the barriers of geography and time: • Ubiquity • Convenience • Instant connectivity • Personalization • Localization of products and services
Mobile Commerce (m-Commerce) • Refers to electronic commerce transactions that are conducted in a wireless environment, especially via the Internet.
Mobile Commerce (m-Commerce) • Driven by the following factors: • Widespread availability of mobile devices • No need for a PC • The “Cell phone culture” • Declining prices • Bandwidth improvement
Example of mobile commerce Car key and the Speedpass
Pervasive Computing • Ubiquitous/Pervasive Computing is invisible “everywhere computing” that is embedded in the objects around us – the floors, the lights, our cars, washing machine, microwave oven, cell phones, clothes, and so on. (e.g., smart home, smart appliances)
Anatomy of a Bar Code Radio frequency identification (RFID)
RFID Dust by Hitachi Human hair
Product with bar code and RFID tag RFID tag Bar code
Wireless Security • Four major threats • Rogue access point • War driving • Eavesdropping • RF (Radio frequency) jamming