Voice over IP performance monitoring
ACM SIGCOMM Computer Communication Review
Minimizing energy for wireless web access with bounded slowdown
Proceedings of the 8th annual international conference on Mobile computing and networking
Self-tuning wireless network power management
Proceedings of the 9th annual international conference on Mobile computing and networking
CoolSpots: reducing the power consumption of wireless mobile devices with multiple radio interfaces
Proceedings of the 4th international conference on Mobile systems, applications and services
Context-for-wireless: context-sensitive energy-efficient wireless data transfer
Proceedings of the 5th international conference on Mobile systems, applications and services
Towards energy efficient VoIP over wireless LANs
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
Micro power management of active 802.11 interfaces
Proceedings of the 6th international conference on Mobile systems, applications, and services
Interactive wifi connectivity for moving vehicles
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Proceedings of the 6th ACM conference on Embedded network sensor systems
A framework of energy efficient mobile sensing for automatic user state recognition
Proceedings of the 7th international conference on Mobile systems, applications, and services
SurroundSense: mobile phone localization via ambience fingerprinting
Proceedings of the 15th annual international conference on Mobile computing and networking
Fast track article: Human-battery interaction on mobile phones
Pervasive and Mobile Computing
Users and batteries: interactions and adaptive energy management in mobile systems
UbiComp '07 Proceedings of the 9th international conference on Ubiquitous computing
Darwin phones: the evolution of sensing and inference on mobile phones
Proceedings of the 8th international conference on Mobile systems, applications, and services
NAPman: network-assisted power management for wifi devices
Proceedings of the 8th international conference on Mobile systems, applications, and services
Catnap: exploiting high bandwidth wireless interfaces to save energy for mobile devices
Proceedings of the 8th international conference on Mobile systems, applications, and services
The Jigsaw continuous sensing engine for mobile phone applications
Proceedings of the 8th ACM Conference on Embedded Networked Sensor Systems
SAPSM: Smart adaptive 802.11 PSM for smartphones
Proceedings of the 2012 ACM Conference on Ubiquitous Computing
SloMo: downclockingWiFi communication
nsdi'13 Proceedings of the 10th USENIX conference on Networked Systems Design and Implementation
NLify: lightweight spoken natural language interfaces via exhaustive paraphrasing
Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing
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Since one-third of a smart phone's battery energy is consumed by its WiFi interface, it is critical to switch the WiFi radio from its active or Constantly Awake Mode (CAM), which draws high power (726mW with screen off), to its sleep or Power Save Mode (PSM), which consumes little power (36mW). Applications like VoIP do not perform well under PSM mode however, due to their real-time nature, so the energy footprint is quite high. The challenge is to save energy while not affecting performance. In this paper we present SiFi: Silence prediction based WiFi energy adaptation. SiFi examines audio streams from phone calls and tracks when silence periods start and stop. This data is stored in a prediction model. Using this historical data, we predict the length of future silence periods and place the WiFi radio to sleep during these periods. We implement the design on an Android Smart phone and acheive 40% energy savings while maintaining high voice fidelity.