Android 8.1 Sim卡联通3G&4G信号增强

vendor/mediatek/proprietary/frameworks/opt/telephony-base/java/mediatek/telephony/SignalStrengthExt.java
联通3G信号增强：移动网络设置成3G后，可以在Settings-System-About tablet-Status-SIM status 查看SIM卡的信号强度值，一般 -85 以上满格。
12345678910111213141516171819202122232425    public int mapUmtsSignalLevel(int phoneId, int UmtsRscp) {        // [ALPS03252546] -- START , for 3G network        int phoneRaf;        boolean isTdd3G = false;        int level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;         log("mapUmtsSignalLevel, phoneId=" + phoneId);         // TDD/FDD mode        if ((UmtsRscp > -25) || (UmtsRscp == SignalStrength.INVALID))            level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;        else if (UmtsRscp >= -85)            level = SignalStrength.SIGNAL_STRENGTH_GREAT;        else if (UmtsRscp >= -100)            level = SignalStrength.SIGNAL_STRENGTH_GOOD;        else if (UmtsRscp >= -110)            level = SignalStrength.SIGNAL_STRENGTH_MODERATE;        else if (UmtsRscp >= -120)            level = SignalStrength.SIGNAL_STRENGTH_POOR;        else            level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;        log("mapUmtsSignalLevel, level=" + level);        return level;        // [ALPS03252546] -- END    }

public int mapUmtsSignalLevel(int phoneId, int UmtsRscp) {
        // [ALPS03252546] -- START , for 3G network
        int phoneRaf;
        boolean isTdd3G = false;
        int level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
 
        log("mapUmtsSignalLevel, phoneId=" + phoneId);
 
        // TDD/FDD mode
        if ((UmtsRscp > -25) || (UmtsRscp == SignalStrength.INVALID))
            level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        else if (UmtsRscp >= -85)
            level = SignalStrength.SIGNAL_STRENGTH_GREAT;
        else if (UmtsRscp >= -100)
            level = SignalStrength.SIGNAL_STRENGTH_GOOD;
        else if (UmtsRscp >= -110)
            level = SignalStrength.SIGNAL_STRENGTH_MODERATE;
        else if (UmtsRscp >= -120)
            level = SignalStrength.SIGNAL_STRENGTH_POOR;
        else
            level = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        log("mapUmtsSignalLevel, level=" + level);
        return level;
        // [ALPS03252546] -- END
    }

联通4G信号增强：移动网络设置成4G后，可以在Settings-System-About tablet-Status-SIM status 查看SIM卡的信号强度值，一般 -85 以上满格。

 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 >= -85) {//zhuangwf
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GREAT;
        } else if (mLteRsrp >= -100) {
            rsrpIconLevel = SignalStrength.SIGNAL_STRENGTH_GOOD;
        } else if (mLteRsrp >= -115) {
            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 >= 65) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_GREAT;
        } else if (mLteRssnr >= 45) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_GOOD;
        } else if (mLteRssnr >= 10) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_MODERATE;
        } else if (mLteRssnr >= -30) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_POOR;
        } else if (mLteRssnr >= -200) {
            snrIconLevel = SignalStrength.SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
        }
        Rlog.i(TAG, "getLTELevel - rsrp:" + mLteRsrp + " snr:" + mLteRssnr + " rsrpIconLevel:"
                + rsrpIconLevel + " snrIconLevel:" + snrIconLevel);
  
        /* Choose a measurement type to use for notification */
        if (snrIconLevel != -1 && rsrpIconLevel != -1) {
            /*
             * The number of bars displayed shall be the smaller of the bars
             * associated with LTE RSRP and the bars associated with the LTE
             * RS_SNR
             */
            return (rsrpIconLevel < snrIconLevel ? rsrpIconLevel : snrIconLevel);
        } 
       ......
    }