ECE Graduate Seminar

The ECE Department Cordially Invites you to attend the following seminar:


Network Traffic Aware Smartphone Energy Savings




Dr. Gang Zhou

Department of Computer Science

College of William and Mary


Friday, February 22, 2013

3:00 p.m. KH 224


Host:  Dr. Popescu


 Recent popularity in Smartphones has created an increased interest in carrying small devices with limited battery capacity. Unfortunately, Smartphones are also notorious for consuming energy far too quickly. Although certain advances have been made on the hardware side such as better batteries, this talk is focused on improving energy management software to make better use of existing batteries. For modern smartphone, a major cause of battery drain is wireless communications. Most Smartphones come equipped with multiple radio transceivers, such as Bluetooth, GPS, WiFi and 3G/4G, among which power hungry WiFi or 3G/4G radios are required for access to the Internet. The frequency of use of these radios is spurred by the popularity of smartphone applications, and many applications require the phone to be constantly connected to the Internet. The wide availability of applications, for instance the Android Market has over 700K registered applications, shows that the need to save smartphone radio energy is highly relevant and urgent today.

 While significant research over the past several years has been done regarding energy savings in smartphones, our research in this talk aims to save smartphone radio energy with a network traffic aware approach. Two major research challenges are addressed:(1) Some applications with delay sensitive data should be processed as such, while others such as advertisements in smartphone video games are delay tolerant allowing us to save energy. How can the priority be determined, and how can we use the priority to save energy for only those applications that are delay tolerant? (2) Network traffic of real-time applications is delay sensitive. How can it be communicated while keeping the delay sensitivity in mind and still saving energy? While delay sensitive traffic must be communicated with best performance in mind, performance based communication, however, has a significant energy cost. In order to save energy, special care must be taken to ensure that the radio is placed into low power mode only during periods of time when nothing meaningful is in transmission. To address these challenges, we will present two of our research results that were published in UbiComp 2011 and 2012: exploiting application priority for energy savings, and exploiting delay tolerant time periods within high priority applications, such as real-time applications, for energy savings.



Posted By: Linda Marshall
Date: Mon Feb 18 10:37:04 EST 2013