wireless atm francine lalooses david lancia arkadiusz slanda donald traboini
TRANSCRIPT
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Wireless ATMFrancine 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
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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