Wireless LAN and Bluetooth Networking
Explore the specifications and services defined by IEEE for wireless LAN through IEEE 802.11 standards covering basic and extended service sets, including insights on station types, MAC sublayer, distributed coordination functions, network allocation vector, and fragmentation techniques in wireless communication.
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Presentation Transcript
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
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
Station Types No transition BSS transition ESS Transition Mobility 6
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
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
Fragmentation Frame type Control frame Type and subtype of FC field Four address fieldSequence # CRC NAV 12
Frame Types Management Frames initial communication Control Frames channel access and acknowledgement Data Frame 14
Frame Types Values of subfields in control frames 15
Addressing mechanism Table 14.3 Addresses 16 14.16
Addressing mechanism 17 14.17
Hidden Station Problem 18 14.18
Hidden Station Solution 19 14.19
Bluetooth 20
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
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
Bluetooth 23
Scatternet 24
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
