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EVALUATION OF POLLING SYSTEMS INFLUENCE ON QUALITY OF SERVICE IN COMPUTER NETWORKS
Abstract
The quality of the operation of broadband wireless computer networks is largely determined by the mechanism of an ordered centralized poll of terminal stations, called polling. The models of polling systems adequately describe the operation of broadband wireless networks under the control of Wi-Fi and Wi-MAX protocols with a centralized coordination function (PCF). Despite the complexity and high cost, the equipment supporting centralized management most effectively uses the most valuable resources of a broadband wireless network: frequency resource and bandwidth. The PCF mechanism allows planning the order of access of stations to the data transmission medium, to control the operation of the radio cell, changing its parameters depending on the situation. From the specific polling system underlying the PCF mechanism, the efficiency of the wireless broadband computer network depends largely. Since the IEEE 802.11 standards do not describe a specific method for polling terminal stations, the way to create a poll list and the policy of queue shots for sending, this article focuses on the development and analysis of various polling systems. The article may interest students and researchers involved in the queueing theory and computer network modeling.
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