CHAPTER 7

Wireless, Mobile Computing and Mobile Commerce

CHAPTER OUTLINE

Wireless Devices and Media Wireless Networking Technologies Mobile commerce Pervasive Computing

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Wireless Devices and Media

Telephony Music/Video playerTexting Digital cameraWeb/Email Point-of-Sale terminal?Apps, Apps, Apps …GPSOrganizer/schedulerQWERTY keyboard

Device Capabilities

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Martin Cooper: Inventor of the

cellphone

Microbrowsers in Wireless Devices

Opera Mobile

iPhone Safari4

Wireless Communication Media

Infrared Slow; very short range; requires line-of-sight

Laser (free space optics) Fast, but requires line-of-sight

High-frequency Radio (900 MHz and above) Wireless local area networks (Wi-Fi) Cellular networks Bluetooth (personal area networks) Microware / WiMax

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Wireless Networking Technologies

Short range Bluetooth, Near-field communications

Medium range Wireless LAN (WiFi)

Wide area Cellular, WiMax

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Short Range: Bluetooth and Its Applications

Personal Area Network (PAN)Range: 30 feet

Body Area Network (BAN)

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Short Range: Near-Field Communications

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Medium Range: Wireless LAN (Wi-Fi)

Wired LAN Medium

Wireless Access Points (AP)Provide Hotspots

Wireless Clients

AP Range: 50 - 300 feet 9

Wi-Fi Coverage at CSUN

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Long Range: Cellular Radio Communication

Long Range: WiMax Worldwide

Interoperability for Microwave Access (WiMax)

WiMAX transmitting tower (range: 30 miles)

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Terrestrial Microwave Radio Used to cross inaccessible terrain or to connect

buildings where cable installation would be expensive.

Antennas are about 30 miles apart Requires line of sight

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Satellite-based Microwave Radio

Geosynchronous Earth Orbit Satellites (GEOs)

Long propagation delays

There are also Medium and Low Earth Orbit Satellites (MEOs and LEOs)

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Application Example: GPS

Global Positioning System 24 satellites 12,000 miles above

earth Receivers pick up signals from at

least 4 satellites GPS receivers triangulate position

using time stamps Accuracy: as close as 10 square

centimeters

Source: en.wikipedia.org

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Mobile Commerce An extension of E-Commerce Driven by:

Widespread availability of mobile devices Bandwidth improvement

Popular Applications Financial transactions Reservations/bookings Location-based applications

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Mobile wallet

Location-Based M-Commerce Highly personalized mobile services Based on location

Use GPS- or Bluetooth-enabled cell phones Pull-based – consumers seeking information Push-based – companies sending (unrequested)

information to the consumer (hence the sellphone)

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Wikitude: Aumented Reality

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Location-based advertising

Digital screen

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Pervasive Computing Aka Ubiquitous Computing (Ubicomp)

Computers seem to disappear but are yet everywhere (called Everyware by Adam Greenfield)

Two infrastructure technologies for Ubicomp Radio frequency identification (RFID) Wireless sensor networks (WSNs)

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Example of RFID Application

Coming soon to a supermarket near you

See video

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Various RFID Tags and a Reader

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RFID at Selexyz

RFID tag on book

RFID reader at Selexyz

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Wireless Sensor Networks (WSNs)

Mote

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WSN Application Example 1: Real-time Traffic System

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WSN Application Example 2: “Smart” Electric Grid by

Visualization of home energy usage

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Geosynchronous Earth Orbit

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