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IP is the fundamental protocol of Internet. It provides best efforts service. It has no in-built mechanisms to provide Quality of Service. Some of the applications that are being used in Internet require Quality of Service. IEEE 802.11 which is a wireless LAN standard doesn't support Quality of Service. IEEE introduced the standard IEEE 802.11e to provide Quality of Service. In this paper, service differentiation mechanisms of 802.11e are studied. The limitations of it in providing Quality of Service are identified. The scope for further research is presented.
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