| Summary: | 碩士 === 國立交通大學 === 網路工程研究所 === 97 === Broadband Wireless Access (BWA) system usually provides power saving mechanisms to save the energy consumption of a mobile device during idle. IEEE 802.16e suggests several Power Saving Classes for different type of applications to minimize the power consumption. In this work, we investigate the energy consumption of TCP transmission over WiMAX. First, we evaluate the extra energy consumption introduced by WiMAX MAC in transmitting TCP packets. Then, we consider a long TCP session such as FTP, and evaluate the power consumption of the WiMAX interface when the interface waits for incoming TCP packets.
We conduct a number of experiments in a real WiMAX test-bed and obtain the power consumption parameters and models of a WiMAX interface. These power consumption parameters are further fed into network simulator 2 (NS2) to evaluate the power consumption of WiMAX in transmitting TCP packets. Experimental and simulation results demonstrate that by applying sleep class type II and proxy server in BS can outperform traditional always-on approach by 50% in terms of energy efficiency.
|
|---|
