| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 92 === It is expected that all kinds of services, e.g., voice, high-speed data, image video, etc. will be provided in the next generation of mobile communication systems. It implies that handsets and portable terminals will be used more frequently and/or much longer than ever. One of the ensuing consequences is that the power consumption of the handset is escalating rapidly. In this thesis, we focus on how to switch off or on the mobile handset to reduce the power consumption. The mobile communication handset system can be divided into three units of consuming battery power, which are data receiving, data processing, and the user interface units. Among other things, one of the power-efficient mechanisms is to make the data processing and the user interface units stay on the sleep state while the data receiving unit is waiting for packets from wireless network. We study three wake-up schemes: the threshold, the vacation and the hybrid schemes to conserve power. It has been shown that the traffic in the Internet shows self-similarity. Furthermore, heavy-tailed ON/OFF models have been shown to present self-similarity. Since accessing Internet via mobile communications is a promising application, we also need to take into account the non-Poisson traffic models in designing the power efficient mechanisms for the multimedia handsets. Unfortunately, these traffic models are not suitable for queueing model analysis. In this thesis we consider three traffic models: the Poisson Process, the Interrupted Poisson Process (IPP), and the 2-state Markov Modulated Poisson Process (MMPP). Both analytical and simulation models are considered to evaluate three wake-up schemes under three different traffic models. The performance measures of interest are the switch-on rate, the packet dropping probability, and the waiting time.
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