Wireless ATM

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Wireless ATM

• Francine Lalooses
• David Lancia
• Arkadiusz Slanda
• Donald Traboini

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Overview

• What is ATM?
• The Promise of Wireless ATM
• Transition from Wired ATM
• Advantages and Disadvantages
• Research and Implementations
• Goals of the Project

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What is ATM?

• Asynchronous Transfer Mode (ATM)
• A networking technology developed by the
  telephone companies to handle all types of data
  using fixed 53-byte cells, or packets.
• Creates virtual point-to-point circuit
  connections between the source and the
  destination.
• Data rates from 25 to 622 Mbps.

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What is ATM?

• The small cell size allows ATM to transmit
  video, audio, and computer data over the same
  network, while guaranteeing a preset QoS level
  for each.

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The Promise of W-ATM

• Extension of LAN for mobile user
• Simplified wiring and configuration
• Provide high-speed data access for users without
  need for a new wired infrastructure
• Create unforeseen opportunities for future
  applications

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W-ATM
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Transition Issues

• Physical Layer
• Infrared vs. Radio
• Circuit-switched vs. Packet-switched
• Channel Coding
• Multiple Antennas
• Operating Frequency
• Licensed vs. Unlicensed Frequency

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Operating Frequency
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Transition Issues

• Data Link Layer
• Encapsulation
• Header Compression
• ARQ (Automatic Repeat Request) vs. FEC (Forward
  Error Correction)
• Quality-of-Service Issues
• Split Functionality
• An Example Protocol

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Proposed Architecture
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Advantages of W-ATM

• Benefits of ATM made mobile
• Free to roam
• Flexible bandwidth allocation
• Efficient multiplexing of traffic
• Availability of existent ATM switching
• Flexibility of reusing same frequency
• Soft handoff without any data loss

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W-ATM Base Stations
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Disadvantages of W-ATM

• Delay to multi-path interference
• Hop-by-hop routing method not adequate
• Virtual connection takes longer
• Poor physical level characteristics
• High noise interference
• Finding a suitable wireless channel

14
Research and ImplementationMagic WAND (Wireless
ATM Network Demonstrator)

• Goals
• To specify and implement W-ATM
• To promote the standardization of W-ATM
• To demonstrate that W-ATM is technically feasible
• Achievements
• Specifications of W-ATM
• Standardization

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Magic WAND
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Goals

• Simulate the effects of noise on choosing a
  channel
• Analyze the effects of mobility on a wireless ATM
  network