Chapter 7
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CHAPTER 7. Wireless, Mobile Computing and Mobile Commerce. CHAPTER OUTLINE. Wireless Devices and Media Wireless Networking Technologies Mobile commerce Pervasive Computing. Wireless Devices and Media. Device Capabilities. TelephonyMusic/Video player Texting Digital camera

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Wireless, Mobile Computing and Mobile Commerce


  • Wireless Devices and Media

  • Wireless Networking Technologies

  • Mobile commerce

  • Pervasive Computing

Wireless Devices and Media

Device Capabilities

TelephonyMusic/Video player

TextingDigital camera

Web/EmailPoint-of-Sale terminal?

Apps, Apps, Apps …



QWERTY keyboard

Martin Cooper: Inventor of the cellphone

Microbrowsers in Wireless Devices

Opera Mobile

iPhone Safari

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

Wireless Networking Technologies

  • Short range

    • Bluetooth, Near-field communications

  • Medium range

    • Wireless LAN (WiFi)

  • Wide area

    • Cellular, WiMax

Short Range: Bluetooth and Its Applications

Body Area Network (BAN)

Personal Area Network (PAN)

Range: 30 feet

Short Range: Near-Field Communications

Medium Range: Wireless LAN (Wi-Fi)

Wired LAN Medium

Wireless Clients

Wireless Access Points (AP)

Provide Hotspots

AP Range: 50 - 300 feet

Wi-Fi Coverage at CSUN

Long Range: Cellular Radio Communication

Long Range: WiMax

  • Worldwide Interoperability for Microwave Access (WiMax)

WiMAX transmitting tower (range: 30 miles)

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

Geosynchronous Earth Orbit Satellites (GEOs)

Long propagation delays

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

Satellite-based Microwave Radio

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


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

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)

Wikitude: Aumented Reality

Location-based advertising

Digital screen

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)

Example of RFID Application

Coming soon to a supermarket near you

See video

Various RFID Tags and a Reader

RFID at Selexyz

RFID tag on book

RFID reader at Selexyz

Wireless Sensor Networks (WSNs)


WSN Application Example 1: Real-time Traffic System

WSN Application Example 2: “Smart” Electric Grid by

Visualization of home energy usage

Geosynchronous Earth Orbit

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