⼿机信号强度划分
  en.wanweibaike/wiki-Mobile_phone_signal
⼀、术语
  ASU：Arbitrary Strength Unit。⽤于衡量信号强度，参考dBm
  RSSI，Received Signal Strength Indication，接收的信号强度指⽰
  RSCP，received signal code power
  RSRP，reference signal received power
⼆、⼿机信号强度
  GSM⽹络：Rx=-111+rxlev。rxlev电平等级，取值0-63(对应-110-48dBm)。其中Rxlev=0代表信号电平<-110dBm，Rxlev=1代表信号电平-110≤Rx<-109dBm，Rxlev=63，代表信号电平Rx≥-48dBm。
  GSM⽹络：RSSI=-113+2*asu，asu=0到31、99（未知或未侦测到）。参考：TS 27.007 sub clause 8.5
  UMTS⽹络下，RSCP=asu-116，asu取值-5到91、255（未知或未侦测到）。参考：TS 27.007 sub clause 8.69和TS 27.133 sub clause 9.1.1.3
  UMTS⽹络，CPICH Ec/Io，取值-24到0dB
  LTE⽹络下，RSRP=asu-140，asu取值0到97。当asu在1-96，可⽤表⽰为(asu-141)
<=dbm<(asu-140)。0对应RSRP<-140dBm，97对应RSRP>-44dBm。参考：TS 36.133, sub-clause 9.1.4
三、代码
1、GSM
* Get the GSM Signal Strength, ASU取值(0-31, 99)，定义在TS 27.007 sec 8.5
// asu = 0 (-113dB or less) is very weak
// asu = 99 is a special case, where the signal strength is unknown.
if (asu <= 2 || asu == 99) level = NONE_OR_UNKNOWN(0);
else if (asu >= 12) level = GREAT(4);
else if (asu >= 8)  level = GOOD(3);
else if (asu >= 5)  level = MODERATE(2);
else level = POOR(1);
2、CDMA
if (cdmaDbm >= -75) levelDbm = 4;
else if (cdmaDbm >= -85) levelDbm = 3;
else if (cdmaDbm >= -95) levelDbm = 2;
else if (cdmaDbm >= -100) levelDbm = 1;
// Ec/Io are in dB*10
if (cdmaEcio >= -90) levelEcio = 4;
else if (cdmaEcio >= -110) levelEcio = 3;
else if (cdmaEcio >= -130) levelEcio = 2;
else if (cdmaEcio >= -150) levelEcio = 1;
if (evdoDbm >= -65) levelEvdoDbm = 4;
else if (evdoDbm >= -75) levelEvdoDbm = 3;
else if (evdoDbm >= -90) levelEvdoDbm = 2;
else if (evdoDbm >= -105) levelEvdoDbm = 1;
if (evdoSnr >= 7) levelEvdoSnr = 4;
else if (evdoSnr >= 5) levelEvdoSnr = 3;
else if (evdoSnr >= 3) levelEvdoSnr = 2;
else if (evdoSnr >= 1) levelEvdoSnr = 1;
3、TD-SCDMA
if ((tdScdmaDbm > -25) || (tdScdmaDbm == SignalStrength.INVALID))  level = NONE_OR_UNKNOWN;
else if (tdScdmaDbm >= -49) level = GREAT;
else if (tdScdmaDbm >= -73) level = GOOD;
else if (tdScdmaDbm >= -97) level = MODERATE;
else if (tdScdmaDbm >= -120) level = POOR;
4、LTE
* TS 36.214 Physical Layer Section 5.1.3 TS 36.331
if (mLteRsrp > -44) rsrpIconLevel = -1;
else if (mLteRsrp >= -85) rsrpIconLevel = GREAT;
else if (mLteRsrp >= -95) rsrpIconLevel = GOOD;
else if (mLteRsrp >= -105) rsrpIconLevel = MODERATE;
else if (mLteRsrp >= -115) rsrpIconLevel = POOR;
else if (mLteRsrp >= -140) rsrpIconLevel = NONE_OR_UNKNOWN;
if (mLteRssnr > 300) snrIconLevel = -1;
else if (mLteRssnr >= 130) snrIconLevel = GREAT;
else if (mLteRssnr >= 45) snrIconLevel = GOOD;
else if (mLteRssnr >= 10) snrIconLevel = MODERATE;
else if (mLteRssnr >= -30) snrIconLevel = POOR;
else if (mLteRssnr >= -200)
/* Valid values are (0-63, 99) as defined in TS 36.331 */
if (mLteSignalStrength > 63) rssiIconLevel = NONE_OR_UNKNOWN;        else if (mLteSignalStrength >= 12) rssiIconLevel = GREAT;
else if (mLteSignalStrength >= 8) rssiIconLevel = GOOD;
else if (mLteSignalStrength >= 5) rssiIconLevel = MODERATE;        else if (mLteSignalStrength >= 0) rssiIconLevel = POOR;
/* 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
手机unknown是什么意思
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*/

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