ch14 wirelesslan - compatibility mode
TRANSCRIPT
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14.1
Chapter 14
Wireless LANs
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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14.2
14-1 IEEE 802.11
IEEE has defined the specifications for a wirelessLAN, called IEEE 802.11, which covers the physicaland data link layers.
ArchitectureMAC SublayerPhysical Layer
Topics discussed in this section:
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14.3
A BSS without an AP is called an ad hocnetwork;
a BSS with an AP is called aninfrastructure network.
Note
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14.4
Figure 14.1 Basic service sets (BSSs)
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14.5
Figure 14.2 Extended service sets (ESSs)
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14.6
Figure 14.3 MAC layers in IEEE 802.11 standard
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14.7
Figure 14.4 CSMA/CA flowchart
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14.8
Figure 14.5 CSMA/CA and NAV
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14.9
Figure 14.6 Example of repetition interval
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14.10
Figure 14.7 Frame format
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14.11
Table 14.1 Subfields in FC field
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14.12
Figure 14.8 Control frames
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14.13
Table 14.2 Values of subfields in control frames
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14.14
Table 14.3 Addresses
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14.15
Figure 14.9 Addressing mechanisms
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14.16
Figure 14.10 Hidden station problem
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14.17
The CTS frame in CSMA/CA handshake can prevent collision from
a hidden station.
Note
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14.18
Figure 14.11 Use of handshaking to prevent hidden station problem
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14.19
Figure 14.12 Exposed station problem
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14.20
Figure 14.13 Use of handshaking in exposed station problem
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14.21
Table 14.4 Physical layers
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14.22
Figure 14.14 Industrial, scientific, and medical (ISM) band
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14.23
Figure 14.15 Physical layer of IEEE 802.11 FHSS
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14.24
Figure 14.16 Physical layer of IEEE 802.11 DSSS
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14.25
Figure 14.17 Physical layer of IEEE 802.11 infrared
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14.26
Figure 14.18 Physical layer of IEEE 802.11b
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14.27
14-2 BLUETOOTH
Bluetooth is a wireless LAN technology designed toconnect devices of different functions such astelephones, notebooks, computers, cameras, printers,coffee makers, and so on. A Bluetooth LAN is an adhoc network, which means that the network is formedspontaneously.
ArchitectureBluetooth LayersBaseband LayerL2CAP
Topics discussed in this section:
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14.28
Figure 14.19 Piconet
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14.29
Figure 14.20 Scatternet
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14.30
Figure 14.21 Bluetooth layers
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14.31
Figure 14.22 Single-secondary communication
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14.32
Figure 14.23 Multiple-secondary communication
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14.33
Figure 14.24 Frame format types
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14.34
Figure 14.25 L2CAP data packet format