1. Wireless ATM
PRESENTED BY :
NIPURBA KONAR

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

3. 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.

4. What it does?
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.

5. 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

6. W-ATM

7. Transition Issues Physical Layer
WATM requires high speed radio modem capable of providing reasonable transmission
Target bit rates of WATM PHY is in the range of 25Mbps
Moreover burst operation must be supported
Modulation techniques such as QAM and QPSK can be used

8. Operating Frequency

9. Transition Issues Data Link Layer
Mitigates effect of error before ATM CELLS are released in the channel
Error detection and retransmission techniques are used for this purpose
Additional UBR allocations are made at data link layer is added to support retransmission

10. Proposed Architecture

11. LOCATION MANAGEMENT Home base station maintains a pointer
Standard SET UP MESSAGE
RELEASE message returned with new information element if device is away
SET UP MESSAGE is sent with foreign address as routing ID

12. HAND OFF CONTROL
Dynamically support active connection during migration
Mobile IP v/s WATM
Mantainance of routing optimality and QOS
Signal such as HAND OFF_CONFIRM
HAND OFF REQUEST USED

13. ADANTAGES OF W-ATM Free to Roam Flexible bandwidth allocation
Efficient multiplexing of traffic
Flexibility of reusing same frequency
Soft handoff without any data loss

14. Disadvantages of W-ATM
Delay to multi-path interference
Hop-by-hop routing method not adequate
Virtual connection takes longer
Finding a suitable wireless channel

15. Goals
Integration of wireless physical layer , medium access control and data link layer
Analyze the effects of mobility on a wireless ATM network
Hand off control and location management

16. THANK YOU