CoolSpots Reducing the Power Consumption of Wireless Mobile Devices with Multiple Radio Interfaces

CoolSpots Reducing the Power Consumption of Wireless Mobile Devices with Multiple Radio Interfaces

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CoolSpots: Reducing the Power Consumption of Wireless Mobile Devices with Multiple Radio Interfaces Trevor Pering Intel Research 2200 Mission College Blvd. Santa Clara, CA 95054 trevor.pering@intel.com Yuvraj Agarwal CSE, UC San Diego 9500 Gilman Drive La Jolla, CA 92093 yuvraj@cs.ucsd.edu Rajesh Gupta CSE, UC San Diego 9500 Gilman Drive La Jolla, CA 92093 gupta@cs.ucsd.edu Roy Want Intel Research 2200 Mission College Blvd. Santa Clara, CA 95054 roy.want@intel.com Abstract CoolSpots enable a wireless mobile device to automatically switch between multiple radio interfaces, such as WiFi and Bluetooth, in order to increase battery lifetime. The main contribution of this work is an exploration of the policies that enable a system to switch among these interfaces, each with diverse radio characteristics and different ranges, in order to save power – supported by detailed quantitative measurements. The system and policies do not require any changes to the mobile applications themselves, and changes required to existing infrastructure are minimal. Results are reported for a suite of commonly used applications, such as file transfer, web browsing, and streaming media, across a range of operating conditions. Experimental validation of the CoolSpot system on a mobile research platform shows substantial energy savings: more than a 50% reduction in energy consumption of the wireless subsystem is possible, with an associated increase in the effective battery lifetime. Categories and Subject Descriptors C.2.2 [COMPUTER-COMMUNICATION NETWORKS]: Net- work Operations – network management, network monitoring. General Terms Algorithms, Measurement, Design Keywords Multi-radio systems, low-power systems, handheld devices, wireless communication, pervasive computing. 1 Introduction The utility of mobile devices is directly impacted by their operating lifetime before on-board batteries need to be replaced or recharged. In advanced mobile computing plat- forms such as PDAs and smart-phones, the wireless com- munication subsystem accounts for a major component of the total power consumption [1][10] due to the communica- tion centric usage of these devices. Furthermore, these plat- forms are increasingly being equipped with multiple radio interfaces to handle a variety of connections, ranging from Bluetooth for personal-area links, WiFi for local-area con- nectivity, and GPRS for wide-area data access. Previous research has explored the idea of switching among multiple radio interfaces in an attempt to reduce overall power consumption: By using the appropriate wire- less interface for the current application workload, and keeping the others effectively turned off, the system can save energy. For example, for applications with low net- work-utilization the low-power/low-bandwidth interface can be used, and the system can dynamically switch to the high-power/high-bandwidth interface when necessary.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 13

CoolSpots Reducing the Power Consumption of Wireless Mobile Devices with Multiple Radio Interfaces

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online