Causes and fixes of unexpected phone shutoffs

Causes and fixes of unexpected phone shutoffs
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手机意外关机的原因及解决方法

DOI:
10.1145/3386901.3389024
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发表时间:
2020
期刊:
ACM MobiSys'20
影响因子:
--
通讯作者:
Shin, Kang G.
Shin, Kang G.
中科院分区:
--
文献类型:
--
作者:
Lee, Youngmoon;He, Liang;Shin, Kang G.

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许多用户报告称,他们的智能手机会意外关闭,即使显示的剩余电池电量超过 30%。在从用户和手机端检查问题后,我们发现这些意外关机的原因是手机电池内部动态压降较大,而电池内部压降又是由电池内阻和手机放电电流的动态变化引起的。为了解决这些意外关闭问题,我们设计了一种新颖的电池感知电源管理 (BPM) 中间件,可以解决手机操作中的这些双重动态问题。具体来说,BPM 使用一种新颖的占空比充电方法来分析电池的内阻,该内阻随电池充电状态 (SoC)、温度和老化而变化。然后,BPM 在运行时根据构建的电池配置文件调节手机的放电电流。我们已经在来自不同 OEM 的 4 款配备最新电池固件的商用智能手机上实施并评估了 BPM,证明 BPM 可以防止手机意外关闭并将其运行时间延长 1.16--2.03 倍。我们的用户研究(包括 121 名手机用户)也证实了 BPM 的实用性/吸引力。
Many users have reported that their smartphones shut off unexpectedly, even when they show >30% remaining battery capacity. After examining the problem from both the user and phone sides, we discovered the cause of these unexpected shutoffs to be a large and dynamic internal voltage drop of the phone battery, which is, in turn, caused by the dynamics of both battery's internal resistance and the phone's discharge current. To fix these unexpected shutoffs, we design a novelBattery-aware Power Management(BPM) middleware that accounts for these dual-dynamics in phone operation. Specifically, BPM profiles the battery's internal resistance --- which varies with battery state-of-charge (SoC), temperature, and aging --- using a novel duty-cycled charging method. BPM then regulates, at run-time, the phone's discharge current based on the constructed battery profile. We have implemented and evaluated BPM on 4 commodity smartphones from different OEMs with the latest battery firmware, demonstrating that BPM prevents unexpected phone shutoffs and extends their operation time by 1.16--2.03X. Our user study, which includes 121 mobile phone users, also corroborates BPM's usefulness/attractiveness.
DOI: 10.1145/2789168.2790103
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影响因子: --
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DOI: --
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影响因子: 7.9
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