Most of Wireless networks depend on IEEE 802.11 standard, which use DCF (Distributed coordination function) algorithm to access the media. According to this algorithm, all the flows of the data have the same priority to access the media, which makes the standard IEEE 802.11 restricted in use with real time applications. Since IEEE 802.11 standard doesn't have a mechanism to distinguish flows of data, IEEE 802.11e has been developed. It depends on (EDCA) algorithm to achieve quality of service by identifying four kinds of data flows, this algorithm gives all frames that form the video the same priority regardless of importance of these frames, so Constant Assignment Algorithm and Dynamic Assignment Algorithm have been suggested. These algorithms take into account the importance of the frames that form the video to achieve quality of service. This paper aim at comparing the two standards IEEE 802.11 and IEEE802.11e according to quality of service using several scenarios, furthermore it studies the effect of Constant Assignment Algorithm and Dynamic Assignment Algorithm and the default algorithm (EDCA) in achieving quality of service when transferring videos over mobile wireless networks.
Al-Baath University Journal.
2015.
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