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In this paper, first, sleep-mode and wake-mode existing in the Medium Access Control (MAC) layer of IEEE 802.16 are introduced. Next cycles of sleep-mode are described. Finally optimum Tmin , which is obtained by improving the length of Tminpsilas window in sleep-mode of previous methods, is described. This method changes Tmin with the changes of network load to reach the best situation in power consumption...
The increase of efficiency within wireless train control systems is essential. The circuit-switched technologies actually used will not provide the needed transmission quality for ERTMS/ETCS if the number of concurrent users increases as prognosticated until 2015. The promising solution might be the packet-switched approach of GPRS, but there are still a lot of open questions to be answered; mostly,...
A constantly growing interest in cellular and mobile technology has lead to a need for MAC protocols specifically designed to accommodate high bandwidth multimedia services with high mobility (such as vehicular networks) unlike conventional cellular telephony systems. This paper presents the design and performance evaluation of a MAC protocol for a motorway environment with audio sources and variable...
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