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WiMax MAC over WiFi PHY for rural communication

Anirudha Bodhankar


The 802.11(WiFi) wireless family is known for its effective use for indoor communication. It is a low cost option for setting up network. The chipsets are designed so that PHY and MAC layers are separate. Also it operates in 2.5GHz ISM band which is license free spectrum avoiding licensing cost. The only problem in using WiFi for outdoor long range (15-20 Km) is its MAC. The DCF mode does not support any quality of service, while PCF is not suitable for large number of stations and long distance. Approach we propose is to replace the MAC of WiFi with the MAC similar to that of 802.16 MAC (we call this WiFiRe here onwards) which is suitable for long range communication. WiFiRe is multi-sector MAC which controls more than one WiFi directional PHY. Line of sight is necessary for long range communication. This scenario is perfectly suitable for setting up communication network in rural area. Rural area has very few high rise buildings making line of sight possible between stations.

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