Wireless ATM Francine Lalooses David Lancia Arkadiusz Slanda

Wireless ATM Francine Lalooses David Lancia Arkadiusz Slanda Donald Traboini Lalooses*Lancia*Slanda*Traboini

Overview • • • What is ATM? The Promise of Wireless ATM Transition from Wired ATM Advantages and Disadvantages Research and Implementations Goals of the Project Lalooses*Lancia*Slanda*Traboini

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. Lalooses*Lancia*Slanda*Traboini

What is ATM? • The small cell size allows ATM to transmit video, audio, and computer data over the same network, while guaranteeing a preset Qo. S level for each. Lalooses*Lancia*Slanda*Traboini

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 Lalooses*Lancia*Slanda*Traboini

W-ATM Lalooses*Lancia*Slanda*Traboini

Transition Issues • Physical Layer • • • Infrared vs. Radio Circuit-switched vs. Packet-switched Channel Coding Multiple Antennas Operating Frequency • Licensed vs. Unlicensed Frequency Lalooses*Lancia*Slanda*Traboini

Operating Frequency Lalooses*Lancia*Slanda*Traboini

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 Lalooses*Lancia*Slanda*Traboini

Proposed Architecture Lalooses*Lancia*Slanda*Traboini

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 Lalooses*Lancia*Slanda*Traboini

W-ATM Base Stations Lalooses*Lancia*Slanda*Traboini

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 Lalooses*Lancia*Slanda*Traboini

Research and Implementation Magic 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 Lalooses*Lancia*Slanda*Traboini

Magic WAND Lalooses*Lancia*Slanda*Traboini

Goals • Simulate the effects of noise on choosing a channel • Analyze the effects of mobility on a wireless ATM network Lalooses*Lancia*Slanda*Traboini