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Merge "Introduce getRssi() in CellSignalStrengthLte"

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Shuo Qian
2018-11-09 22:07:50 +00:00
committed by Gerrit Code Review
parent cfcb33cb32 5b76bfc0d0
commit 5bdf255e0d
2 changed files with 46 additions and 0 deletions
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1
api/current.txt
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@@ -42293,6 +42293,7 @@ package android.telephony {
method public int getLevel(); method public int getLevel();
method public int getRsrp(); method public int getRsrp();
method public int getRsrq(); method public int getRsrq();
method public int getRssi();
method public int getRssnr(); method public int getRssnr();
method public int getTimingAdvance(); method public int getTimingAdvance();
method public void writeToParcel(android.os.Parcel, int); method public void writeToParcel(android.os.Parcel, int);

45
telephony/java/android/telephony/CellSignalStrengthLte.java
View File

@@ -31,6 +31,25 @@ public final class CellSignalStrengthLte extends CellSignalStrength implements P
private static final String LOG_TAG = "CellSignalStrengthLte"; private static final String LOG_TAG = "CellSignalStrengthLte";
private static final boolean DBG = false; private static final boolean DBG = false;
/**
* Indicates the unknown or undetectable RSSI value in ASU.
*
* Reference: TS 27.007 8.5 - Signal quality +CSQ
*/
private static final int SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN = 99;
/**
* Indicates the maximum valid RSSI value in ASU.
*
* Reference: TS 27.007 8.5 - Signal quality +CSQ
*/
private static final int SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MAX_VALUE = 31;
/**
* Indicates the minimum valid RSSI value in ASU.
*
* Reference: TS 27.007 8.5 - Signal quality +CSQ
*/
private static final int SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MIN_VALUE = 0;
@UnsupportedAppUsage @UnsupportedAppUsage
private int mSignalStrength; private int mSignalStrength;
@UnsupportedAppUsage @UnsupportedAppUsage
@@ -141,6 +160,19 @@ public final class CellSignalStrengthLte extends CellSignalStrength implements P
return mRsrq; return mRsrq;
} }
/**
* Get Received Signal Strength Indication (RSSI) in dBm
*
* The value range is [-113, -51] inclusively or {@link CellInfo#UNAVAILABLE} if unavailable.
*
* Reference: TS 27.007 8.5 Signal quality +CSQ
*
* @return the RSSI if available or {@link CellInfo#UNAVAILABLE} if unavailable.
*/
public int getRssi() {
return convertRssiAsuToDBm(mSignalStrength);
}
/** /**
* Get reference signal signal-to-noise ratio * Get reference signal signal-to-noise ratio
* *
@@ -309,4 +341,17 @@ public final class CellSignalStrengthLte extends CellSignalStrength implements P
private static void log(String s) { private static void log(String s) {
Rlog.w(LOG_TAG, s); Rlog.w(LOG_TAG, s);
} }
private static int convertRssiAsuToDBm(int rssiAsu) {
if (rssiAsu != SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN
&& (rssiAsu < SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MIN_VALUE
|| rssiAsu > SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MAX_VALUE)) {
Rlog.e(LOG_TAG, "convertRssiAsuToDBm: invalid RSSI in ASU=" + rssiAsu);
return CellInfo.UNAVAILABLE;
}
if (rssiAsu == SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN) {
return CellInfo.UNAVAILABLE;
}
return -113 + (2 * rssiAsu);
}
} }