Energy Profiling of Hardware Subsystems and User Settings on Android

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Julkaisun nimi: Energy Profiling of Hardware Subsystems and User Settings on Android
Tekijä: Shen, Cenyu
Muu tekijä: Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Tietojenkäsittelytieteen laitos
Opinnäytteen taso: pro gradu -tutkielmat
Tiivistelmä: The performance of today's smartphones is heavily limited by their batteries. To meet the increasing demands from end-users on smartphones with better battery life, Android mobile manufacturers are hunting for new approaches to improve their phones' batteries. For example, they use smart battery interfaces on their existing batteries, and they also render more usable power-saving features and settings that mobile users can use to minimize the power consumption of smartphones. But unfortunately, users always have inadequate knowledge about power characteristics and features of their mobile devices. This highlights the necessity to let users know how they should deal with limited battery lifetime and thus perform the optimal and effective energy management. Especially when the battery gets critically low, users should have a good understanding of how to better manage the remaining battery and take appropriate measures to make their phones last longer for at least keeping basic email and call communication. The objective of this thesis is to provide Android mobile users with a series of control points on maximizing the lifetime of their low-battery smartphones when they desire to maintain basic communication for emailing and calling. To achieve this goal, a detailed analysis will be performed on an Android smartphone, Samsung Google Nexus S. In the beginning, I will introduce an overview of energy profiling on the Android platform, where Carat will be presented as a practical example of energy profilers aiming for detecting energy bugs on users' smartphones and providing them with diagnosis reports to reduce the power consumed by their phones. After that, I attempt to find out how general hardware subsystems (eg. screen backlight and internet connections) and background application processes will impact battery life of smartphones by undertaking physical power measurements of the tested phone under a wide range of realistic usage scenarios. At last, I will evaluate the experimental results from users' perspectives to figure out under which circumstances battery life of smartphones will be maximized, and then based on the obtained findings I will design actionable recommendations for users on battery management. From this study, I have found that screen backlight, Internet connections and background application processes indeed impact battery life when users are emailing and calling through low-battery smartphones. In addition, to improve the lifespan of smartphones used for emailing, users should connect to WiFi, adjust screen backlight to the minimum level and stop running those application processes in the background, which have been identified by Carat as energy hogs or bugs. Moreover, if users want to have Internet calls through the Skype, they are recommended to choose WiFi connections and kill background application processes. At the same time, if Dialer is used for calling, users should disable any Internet connections to reduce the power consumption of their smartphones.
Kuvaus: Vain tiivistelmä. Opinnäytteiden arkistokappaleet ovat luettavissa Helsingin yliopiston kirjastossa. Hae HELKA-tietokannasta ( only. The paper copy of the whole thesis is available for reading room use at the Helsinki University Library. Search HELKA online catalog ( avhandlingens sammandrag. Pappersexemplaret av hela avhandlingen finns för läsesalsbruk i Helsingfors universitets bibliotek. Sök i HELKA-databasen (
Päiväys: 2013-05-30
Oppiaine: Networking and Service


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