1. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Chapter 15 Wireless LANs

2. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 15.1 IEEE 802.11 Architecture Physical Layer MAC Layer Addressing Mechanism

3. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.1 BSSs

4. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.2 ESS

5. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.3 Physical layer specifications

6. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.4 FHSS

7. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Frequency Hopping Spread Spectrum Dwell Time: 400 mseg Banda de 2.4 Ghz (ISM) 79 sub-bandas de 1 MHz FSK: 1 ó 2 bits por baud

8. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.5 DSSS

9. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Canales DSSS

10. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Direct Sequence Spread Spectrum 802.11b: HR-DSSS (High Rate DSSS) CCK (Complementary Code Keying) Símbolos de 4 u 8 bits 1 Mbps: BPSK 2 Mbps: QPSK 5.5 Mbps: BPSK (1.375 Mbaud; 4 bits CCK) 11 Mbps: QPSK (1.375 Mbaud; 8 bits CCK)

11. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.6 MAC layers in IEEE 802.11 standard Distributed Coordination Function Point Coordination Function

12. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 ¿Por qué NO CSMA/CD? Transmitir y recibir al mismo tiempo. Tarjetas más caras y mayor capacidad “Estación escondida” “Estación expuesta” ABCD

13. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.7 CSMA/CA flowchart

14. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.8 CSMA/CA and NAV

15. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.9 Frame format

16. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Table 15.1 Subfields in FC field When set to 1, means station has more data to send. More data Wired equivalent privacy. When set to 1, means encryption implemented. WEP Reserved.Rsvd Defined later. From DS When set to 1, means more fragments. More flag When set to 1, means retransmitted frame. Retry When set to 1, means station is in power management mode. Pwr mgt Defined later. To DS Defines the subtype of each type (see ). Subtype Type of information: management (00), control (01), or data (10). Type The current version is 0. ExplanationVersion Field

17. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.10 Control frames

18. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Table 14.2 Values of subfields in control frames Acknowledgment (ACK) 1101 Clear to send (CTS) 1100 Request to send (RTS) Meaning 1011 Subtype

19. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Table 15.1 Subfields in FC field Sending AP Source station Sending AP Source station Address 2 Destination station Source station BSS ID Address 3 Source station N/A N/A N/A Address 4 Receiving AP Destination station Address 1 1 0 1 0 From DS 1 1 0 0 To DS

20. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.11 Addressing mechanism: case 1

21. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.12 Addressing mechanism: case 2

22. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.13 Addressing mechanism: case 3

23. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.14 Addressing mechanism: case 4

24. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 15.2 Bluetooth Architecture Radio Layer Baseband Layer Other Upper Layers L2CAP Layer

25. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.15 Piconet

26. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.16 Scatternet

27. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.17 Bluetooth layers

28. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.18 Single-slave communication

29. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.19 Multiple-slave communication

30. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.20 Frame format types

31. McGraw-Hill The McGraw-Hill Companies, Inc., 2004 Figure 15.21 L2CAP data packet format