Internet connection suspended after blocking Android phone

Question

Internet connection suspended after blocking Android phone

I am creating an application that can periodically receive a location using NETWORK_PROVIDERin the background without using GPS_PROVIDER. I use ALARM_SERVICEand WakeLock( PARTIAL_WAKE_LOCK). but the problem I am facing is that the Internet connection is disconnected after turning off the screen. when I unlock the phone, I start to get the location, but when the screen turns off, I get no place.

It's because:

The Internet connection is suspended after turning off the screen, and also when I unlock the screen, I receive USSD code messages for using data, does this mean that my Internet connection is disconnected after turning off the screen?
Although the Internet connection is turned on, the location is not updated in the background because the screen is off.

I use the GpsTracker class to get the location from here and periodically using the AlarmManager location. also in class LatLongBroadcastReceiveri get location.

Intent intent = new Intent(GPSlatlongActivity.this,
                    LatLongBroadcastReceiver.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK
        | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

pendingIntent = PendingIntent.getBroadcast(
        GPSlatlongActivity.this.getApplicationContext(), 0, intent,
        PendingIntent.FLAG_UPDATE_CURRENT);

alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
        SystemClock.elapsedRealtime(),
        (AlarmManager.INTERVAL_FIFTEEN_MINUTES / 15),
        pendingIntent);