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Editorial Team
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Asked: 2026-06-02T01:55:18+00:00

As stated in the answer to a previous question, the CDMA and GSM radios

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As stated in the answer to a previous question, the CDMA and GSM radios are kept on, even after the CPU is put to sleep on an Android device.
My questions are…

  1. When a call is received, what is it that wakes the CPU / phone up ?
  2. Is there a similar mechanism to wake my application up when data is received via an active TCP connection to a server, even after the phone has gone to sleep mode ?
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1 Answer

  1. Editorial Team

    Data cannot be received when the CPU is asleep.

    The CPU needs to be woken up once in a while to see if there is new data. In your code to check for the new data, if there is new data, you can stay awake and go off and do your processing.

    You definitely want to learn about BroadcastReceiver and android alarms. Basically, you can tell Android to send you an Alarm every 5 minutes or whatever, even if it is sleeping. Your BroadcastReceiver wakes up the CPU when it gets the alarm from android, and stays awake long enough to check if you have new data, or whatever you are trying to do. If you have new data, you can then tell the CPU to stay awake and you can go off and process your new data.

    Here is a reasonable tutorial. And of course the Android Developer docs are helpful.

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