14 wireless lan
TRANSCRIPT
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14.1
Chapter 14Wireless LANs
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
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14.2
14-1 IEEE 802.1114-1 IEEE 802.11
IEEE has defined the specifications for a wireless IEEE has defined the specifications for a wireless LAN, called IEEE 802.11, which covers the physical LAN, called IEEE 802.11, which covers the physical and data link layers.and data link layers.
ArchitectureMAC SublayerPhysical Layer
Topics discussed in this section:Topics discussed in this section:
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14.3
A BSS without an AP is called an ad hoc network;
a BSS with an AP is called an infrastructure 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 BLUETOOTH14-2 BLUETOOTH
BluetoothBluetooth is a wireless LAN technology designed to is a wireless LAN technology designed to connect devices of different functions such as connect devices of different functions such as telephones, notebooks, computers, cameras, printers, telephones, notebooks, computers, cameras, printers, coffee makers, and so on. A Bluetooth LAN is an ad coffee makers, and so on. A Bluetooth LAN is an ad hoc network, which means that the network is formed hoc network, which means that the network is formed spontaneously. spontaneously.
ArchitectureBluetooth LayersBaseband LayerL2CAP
Topics discussed in this section: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