OS：MTK9.0

• 位置：vendor/mediatek/proprietary/frameworks/opt/telephony-base/java/mediatek/telephony/SignalStrengthExt.java

OS：MTK6.0

• 位置：vendor/mediatek/proprietary/frameworks/base/packages/FwkPlugin/src/com/mediatek/op/telephony/DefaultServiceStateExt.java

// 6.0
 public int mapGsmSignalLevel(int asu, int gsmRscpQdbm) {
        int level;
        // [ALPS01055164] -- START , for 3G network
        if (gsmRscpQdbm < 0) {
            // 3G network
            if (asu <= 5 || asu == 99) {
                level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
            } else if (asu >= 14) {
                level = SignalStrength.SIGNAL_STRENGTH_GREAT;
            } else if (asu >= 11) {
                level = SignalStrength.SIGNAL_STRENGTH_GOOD;
            } else if (asu >= 8) {
                level = SignalStrength.SIGNAL_STRENGTH_MODERATE;
            } else {
                level = SignalStrength.SIGNAL_STRENGTH_POOR;
            }
        // [ALPS01055164] -- END
         } else {
            // 2G network
            if (asu <= 2 || asu == 99) {
                level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
            } else if (asu >= 12) {
                level = SignalStrength.SIGNAL_STRENGTH_GREAT;
            } else if (asu >= 8) {
                level = SignalStrength.SIGNAL_STRENGTH_GOOD;
            } else if (asu >= 5) {
                level = SignalStrength.SIGNAL_STRENGTH_MODERATE;
            } else {
                level = SignalStrength.SIGNAL_STRENGTH_POOR;
            }
        }
        return level;
 }

 public int mapLteSignalLevel(int mLteRsrp, int mLteRssnr, int mLteSignalStrength) {
        /*
         * TS 36.214 Physical Layer Section 5.1.3 TS 36.331 RRC RSSI = received
         * signal + noise RSRP = reference signal dBm RSRQ = quality of signal
         * dB= Number of Resource blocksxRSRP/RSSI SNR = gain=signal/noise ratio
         * = -10log P1/P2 dB
         */
        int rssiIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        int rsrpIconLevel = -1;
        int snrIconLevel = -1;
        if (mLteRsrp > -44) {
            rsrpIconLevel = -1;
        } else if (mLteRsrp >= -97) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GREAT;
        } else if (mLteRsrp >= -107) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GOOD;
        } else if (mLteRsrp >= -117) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_MODERATE;
        } else if (mLteRsrp >= -125) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_POOR;
        } else if (mLteRsrp >= -140) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        }
         /*
         * Values are -200 dB to +300 (SNR*10dB) RS_SNR >= 13.0 dB =>4 bars 4.5
         * dB <= RS_SNR < 13.0 dB => 3 bars 1.0 dB <= RS_SNR < 4.5 dB => 2 bars
         * -3.0 dB <= RS_SNR < 1.0 dB 1 bar RS_SNR < -3.0 dB/No Service Antenna
         * Icon Only
         */
		if (mLteRssnr > 300) {
            snrIconLevel = -1;
        } else if (mLteRssnr >= 118) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_GREAT;
        } else if (mLteRssnr >= 33) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_GOOD;
        } else if (mLteRssnr >= 0) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_MODERATE;
        } else if (mLteRssnr >= -40) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_POOR;
        } else if (mLteRssnr >= -200) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        }
        Log.i(TAG, "getLTELevel - rsrp:" + mLteRsrp + " snr:" + mLteRssnr + " rsrpIconLevel:"
                + rsrpIconLevel + " snrIconLevel:" + snrIconLevel);
              ...
 }