| Summary: | 碩士 === 國立臺南大學 === 電機工程學系碩博士班 === 104 === In the recent years, with high popularity of smart mobile devices, how to extend their battery life is always an important issue. According to the experiment, for a 3G handheld device, the wireless interface consumes the largest proportion of the total power (up to 40%). In particular, the 4G and 5G wireless communications will provide higher data rate. As a result, the wireless interface in these devices will consume much more power than that in a 3G device. Specifically, emerging cloud computing and IoT applications also increase the operation time of wireless modems in a mobile device. In this case, how to maximize wireless interfaces’ energy efficiency and design effective energy-saving sleep scheduling mechanism become a critical issue.
In this thesis, we design cross-layer energy-saving sleep scheduling mechanisms in LTE-A/B4G uplink by jointly considering system level energy consumption of wireless interfaces and QoS (Quality of Service) requirements of traffic flows. The design considers the Medium Access Control (MAC) Layer multi-user sleep scheduling (via the settings of DRX/DTX parameters) and the Physical Layer power and radio resource allocations at the same time. Furthermore, to maximize the energy efficiency, we also exploit the tolerable packet drop rate and delay bound of traffic flows. When the channel condition is bad for a mobile device, the packet data delivery can be postponed and wait for a better channel quality if its packet drop rate can be guaranteed. Last but not the least, the proposed method is compatible with the 3GPP LTE-A standard.
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