Bài giảng Data Communications and Networking - Chapter 14 Wireless LANs

Tài liệu Bài giảng Data Communications and Networking - Chapter 14 Wireless LANs: Chapter 14Wireless LANsCopyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.114-1 IEEE 802.11IEEE has defined the specifications for a wireless LAN, called IEEE 802.11, which covers the physical and data link layers.Architecture MAC SublayerPhysical LayerTopics discussed in this section:2A BSS without an AP is called an ad hoc network;a BSS with an AP is called an infrastructure network.Note3Figure 14.1 Basic service sets (BSSs)4Figure 14.2 Extended service sets (ESSs)5Figure 14.3 MAC layers in IEEE 802.11 standard6Figure 14.4 CSMA/CA flowchart7Figure 14.5 CSMA/CA and NAV8Figure 14.6 Example of repetition interval9Figure 14.7 Frame format10Table 14.1 Subfields in FC field11Figure 14.8 Control frames12Table 14.2 Values of subfields in control frames13Table 14.3 Addresses14Figure 14.9 Addressing mechanisms15Figure 14.10 Hidden station problem16The CTS frame in CSMA/CA handshake can prevent collision from a hidden station.Note17Figure 14.11 Use of h...

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Chapter 14Wireless LANsCopyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.114-1 IEEE 802.11IEEE has defined the specifications for a wireless LAN, called IEEE 802.11, which covers the physical and data link layers.Architecture MAC SublayerPhysical LayerTopics discussed in this section:2A BSS without an AP is called an ad hoc network;a BSS with an AP is called an infrastructure network.Note3Figure 14.1 Basic service sets (BSSs)4Figure 14.2 Extended service sets (ESSs)5Figure 14.3 MAC layers in IEEE 802.11 standard6Figure 14.4 CSMA/CA flowchart7Figure 14.5 CSMA/CA and NAV8Figure 14.6 Example of repetition interval9Figure 14.7 Frame format10Table 14.1 Subfields in FC field11Figure 14.8 Control frames12Table 14.2 Values of subfields in control frames13Table 14.3 Addresses14Figure 14.9 Addressing mechanisms15Figure 14.10 Hidden station problem16The CTS frame in CSMA/CA handshake can prevent collision from a hidden station.Note17Figure 14.11 Use of handshaking to prevent hidden station problem18Figure 14.12 Exposed station problem19Figure 14.13 Use of handshaking in exposed station problem20Table 14.4 Physical layers21Figure 14.14 Industrial, scientific, and medical (ISM) band22Figure 14.15 Physical layer of IEEE 802.11 FHSS23Figure 14.16 Physical layer of IEEE 802.11 DSSS24Figure 14.17 Physical layer of IEEE 802.11 infrared25Figure 14.18 Physical layer of IEEE 802.11b2614-2 BLUETOOTHBluetooth 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. Architecture Bluetooth Layers Baseband LayerL2CAPTopics discussed in this section:27Figure 14.19 Piconet28Figure 14.20 Scatternet29Figure 14.21 Bluetooth layers30Figure 14.22 Single-secondary communication31Figure 14.23 Multiple-secondary communication32Figure 14.24 Frame format types33Figure 14.25 L2CAP data packet format34

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