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Medium Access Control (MAC) and Wireless LANs

Medium Access Control (MAC). and Wireless LANs Outline Wireless LAN Technology Medium Access Control for Wireless IEEE Wireless LAN Applications LAN Extension Cross-building interconnect Nomadic Access Ad hoc networking LAN Extension Wireless LAN linked into a wired LAN on same premises o Wired LAN. Backbone Support servers and stationary workstations o Wireless LAN. Stations in large open areas Manufacturing plants, stock exchange trading floors, and warehouses Multiple-cell Wireless LAN. Cross-Building Interconnect Connect LANs in nearby buildings o Wired or Wireless LANs Point-to-point Wireless link is used Devices connected are typically bridges or routers Nomadic Access Wireless link between LAN hub and mobile data terminal equipped with antenna Uses: o Transfer data from portable computer to office server o Extended environment such as campus Ad Hoc Networking Temporary peer-to-peer network set up to meet immediate need Example: o Group of employees with laptops convene for a meeting; employees link computer

attempt Discard packet Double window Transmit frame Wait inter-frame period Wait U[0,W] Increment attempt No No No Yes Yes Yes Begin. MAC in IEEE 802.11 idle wait for the right to send wait for ACK sender receiver packet ready to send; RTS time-out; RTS CTS; data ACK RxBusy idle wait for data RTS; RxBusy RTS; CTS data; ACK

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