Wireless LAN and Bluetooth Overview

IEEE has defined specifications for wireless LAN through IEEE 802.11, covering physical and data link layers. The standard includes Basic Service Set and Extended Service Set, which are essential building blocks of wireless LAN networks. Basic Service Set involves stationary or mobile wireless stations, access points, and Ad hoc architecture. On the other hand, Extended Service Set deals with transitioning between different types of stations and mobility within the network. The MAC sublayer incorporates the Distributed Coordination Function, using CSMA/CA access method due to cost and signal issues. It employs the Network Allocation Vector to manage channel occupancy and collision avoidance. Fragmentation in frames allows for efficient data transmission with various control frames and address fields.

• Wireless LAN
• IEEE 802.11
• Bluetooth
• MAC sublayer
• Network Allocation Vector

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Uploaded on Mar 03, 2025 | 0 Views

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Presentation Transcript

1. Wireless LAN and Bluetooth

2. IEEE 802.11 IEEE has defined the specifications for a wireless LAN, called IEEE 802.11, which covers the physical and data link layers. The standard defines two kinds of services: Basic Service Set Extended Service Set 2

3. Basic Service Set 3

4. Basic Service Set Building block of Wireless Lan. Stationary or mobile wireless station. Access Point (AP) Ad hoc Architecture Stand alone network. No AP required Infrastructure Network 4

5. Extended Service Set 5

6. Station Types No transition BSS transition ESS Transition Mobility 6

7. MAC Sublayer 7

8. Distributed Coordination Function Uses CSMA/CA for Access Method Can t use CSMA/CD for three reason: Costly equipments Hidden Station Signal Fading - distance 8

9. Distributed Coordination Function 9

10. Distributed Coordination Function 10

11. Network Allocation Vector A station sends a RTS frame to occupy a channel. Includes the duration of transmission Other station creates a timer -- Known as NAV Collision still occur How ? Two or more stations can send the RTS frame at the same time. There is no such mechanism for collision detection, they assume that CTS not received and employ the back off strategy. Retransmission occurs. 11

12. Fragmentation Frame type Control frame Type and subtype of FC field Four address fieldSequence # CRC NAV 12

13. Subfields in FC 13

14. Frame Types Management Frames initial communication Control Frames channel access and acknowledgement Data Frame 14

15. Frame Types Values of subfields in control frames 15

16. Addressing mechanism Table 14.3 Addresses 16 14.16

17. Addressing mechanism 17 14.17

18. Hidden Station Problem 18 14.18

19. Hidden Station Solution 19 14.19

20. Bluetooth 20

21. Bluetooth Bluetooth is a wireless LAN technology designed to connect devices of different functions such as telephones, notebooks, computers, cameras, printers, coffee makers, and so on. A Bluetooth LAN is an ad hoc network, which means that the network is formed spontaneously. 21

22. Bluetooth Application Peripheral devices Home Security Monitoring Devices Developed from a project of Ericsson Company. IEEE 802.15 Wireless Personal Area Network Architecture Piconet Scatternet 22

23. Bluetooth 23

24. Scatternet 24

25. Bluetooth Layers 25

26. Bluetooth TDD-TDMA Half duplex communication system where sender and receiver cannot send at the same time. Single Secondary communication Time slot of 625 Micro Second 26

27. Baseband Layers 27

28. Baseband Layers 28