Issues and Limitations on Mobile Computing

1
Issues and Limitations on Mobile Computing

• Contents
• Wireless Issues
• Mobile Computing
• Wireless Architecture
• Wireless Access Technologies
• Wireless Applications
• Wireless Limitations
• Middleware for Mobile Computing
• Summary Further Issues

2
Mobile Computing

• What is the computing?
• Operation of computers as Oxford Advanced
  Learners Dictionary states.
• What is the mobile?
• That someone/something can move or be moved
  easily and quickly from place to place as Oxford
  Advanced Learners Dictionary states.
• What is the mobile computing?
• Users with portable computers still have network
  connections while they move.

3
Wireless Architecture

• Personal Communication Network (PCN)
• Extension of nowadays Infranstructure
• ITU Spesifications
• Hierarchical Cell Structure
• Global Roaming
• Expansion of Radio Spectrume

4
Wireless Access Technologies

• Past and Current State
• AMPS, TDMA, CDMA in USA, GSM in Europe, Public
  Packet Radio and CDPD
• Private Mobile Radio
• Wireless LAN
• Satelite Systems

5
Wireless Applications

• Horizontal Applications
• Yellow Pages
• Movies Info
• Vertical Applications
• Access to large amount of data (databases)
• Requirements
• support to any mobile appliance
• support to any network
• capability to sustain long - short time
  disconections
• access replicated data or databese file systems

6
Wireless Limitations

• Mobility
• Auto configuration of the system
• Location management
• Lookups (Track users call)
• Updates (Update users position and/or data)
• Heterogeneity
• Security Authentication
• Spectrum range

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Wireless Limitations

• Wireless Medium
• Cost of Networks
• Quantity and reliability of bandwidth
• Environment obstacles
• Portability Mobile Restrictions
• Low Resources
• Battery Constraints
• Lack of Security

8
Middleware for Mobile Computing

• Middleware
• What is the middleware?
• Considerations
• Application Integration
• Device Independence
• Mobile Agents
• Wireless Application Protocol (WAP)
• bring Internet content to digital cellular phones
• creation of global wireless protocol
  specification
• enable creation of contents with wide range of
  usage
• to extend existing standards

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WAP Research Interests

• Over the air provision
• Persistent Storage
• SIM Tool Kit
• Location Services
• Network Management
• Broadband Services
• Corporate Data Access
• IMT - 2000 (3G) Multimedia Capabilities

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Summary Further Issues

• Wireless Issues
• Wireless Limitations
• Wireless Middleware
• Research on
• Broadcast
• Location Management
• Spectrum Utilisation
• Extension on existent ptotocols