/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.telephony;
import android.os.Parcel;
import android.os.Parcelable;
import android.telephony.Rlog;
/**
* LTE signal strength related information.
*/
public final class CellSignalStrengthLte extends CellSignalStrength implements Parcelable {
private static final String LOG_TAG = "CellSignalStrengthLte";
private static final boolean DBG = false;
private int mSignalStrength;
private int mRsrp;
private int mRsrq;
private int mRssnr;
private int mCqi;
private int mTimingAdvance;
/**
* Empty constructor
*
* @hide
*/
public CellSignalStrengthLte() {
setDefaultValues();
}
/**
* Constructor
*
* @hide
*/
public CellSignalStrengthLte(int signalStrength, int rsrp, int rsrq, int rssnr, int cqi,
int timingAdvance) {
initialize(signalStrength, rsrp, rsrq, rssnr, cqi, timingAdvance);
}
/**
* Copy constructors
*
* @param s Source SignalStrength
*
* @hide
*/
public CellSignalStrengthLte(CellSignalStrengthLte s) {
copyFrom(s);
}
/**
* Initialize all the values
*
* @param lteSignalStrength
* @param rsrp
* @param rsrq
* @param rssnr
* @param cqi
*
* @hide
*/
public void initialize(int lteSignalStrength, int rsrp, int rsrq, int rssnr, int cqi,
int timingAdvance) {
mSignalStrength = lteSignalStrength;
mRsrp = rsrp;
mRsrq = rsrq;
mRssnr = rssnr;
mCqi = cqi;
mTimingAdvance = timingAdvance;
}
/**
* Initialize from the SignalStrength structure.
*
* @param ss
*
* @hide
*/
public void initialize(SignalStrength ss, int timingAdvance) {
mSignalStrength = ss.getLteSignalStrength();
mRsrp = ss.getLteRsrp();
mRsrq = ss.getLteRsrq();
mRssnr = ss.getLteRssnr();
mCqi = ss.getLteCqi();
mTimingAdvance = timingAdvance;
}
/**
* @hide
*/
protected void copyFrom(CellSignalStrengthLte s) {
mSignalStrength = s.mSignalStrength;
mRsrp = s.mRsrp;
mRsrq = s.mRsrq;
mRssnr = s.mRssnr;
mCqi = s.mCqi;
mTimingAdvance = s.mTimingAdvance;
}
/**
* @hide
*/
@Override
public CellSignalStrengthLte copy() {
return new CellSignalStrengthLte(this);
}
/** @hide */
@Override
public void setDefaultValues() {
mSignalStrength = Integer.MAX_VALUE;
mRsrp = Integer.MAX_VALUE;
mRsrq = Integer.MAX_VALUE;
mRssnr = Integer.MAX_VALUE;
mCqi = Integer.MAX_VALUE;
mTimingAdvance = Integer.MAX_VALUE;
}
/**
* Get signal level as an int from 0..4
*/
@Override
public int getLevel() {
int levelRsrp = 0;
int levelRssnr = 0;
if (mRsrp == Integer.MAX_VALUE) levelRsrp = 0;
else if (mRsrp >= -95) levelRsrp = SIGNAL_STRENGTH_GREAT;
else if (mRsrp >= -105) levelRsrp = SIGNAL_STRENGTH_GOOD;
else if (mRsrp >= -115) levelRsrp = SIGNAL_STRENGTH_MODERATE;
else levelRsrp = SIGNAL_STRENGTH_POOR;
// See RIL_LTE_SignalStrength in ril.h
if (mRssnr == Integer.MAX_VALUE) levelRssnr = 0;
else if (mRssnr >= 45) levelRssnr = SIGNAL_STRENGTH_GREAT;
else if (mRssnr >= 10) levelRssnr = SIGNAL_STRENGTH_GOOD;
else if (mRssnr >= -30) levelRssnr = SIGNAL_STRENGTH_MODERATE;
else levelRssnr = SIGNAL_STRENGTH_POOR;
int level;
if (mRsrp == Integer.MAX_VALUE)
level = levelRssnr;
else if (mRssnr == Integer.MAX_VALUE)
level = levelRsrp;
else
level = (levelRssnr < levelRsrp) ? levelRssnr : levelRsrp;
if (DBG) log("Lte rsrp level: " + levelRsrp
+ " snr level: " + levelRssnr + " level: " + level);
return level;
}
/**
* Get signal strength as dBm
*/
@Override
public int getDbm() {
return mRsrp;
}
/**
* Get the LTE signal level as an asu value between 0..97, 99 is unknown
* Asu is calculated based on 3GPP RSRP. Refer to 3GPP 27.007 (Ver 10.3.0) Sec 8.69
*/
@Override
public int getAsuLevel() {
int lteAsuLevel = 99;
int lteDbm = getDbm();
if (lteDbm <= -140) lteAsuLevel = 0;
else if (lteDbm >= -43) lteAsuLevel = 97;
else lteAsuLevel = lteDbm + 140;
if (DBG) log("Lte Asu level: "+lteAsuLevel);
return lteAsuLevel;
}
/**
* Get the timing advance value for LTE.
* See 3GPP xxxx
*/
public int getTimingAdvance() {
return mTimingAdvance;
}
@Override
public int hashCode() {
int primeNum = 31;
return (mSignalStrength * primeNum) + (mRsrp * primeNum)
+ (mRsrq * primeNum) + (mRssnr * primeNum) + (mCqi * primeNum)
+ (mTimingAdvance * primeNum);
}
@Override
public boolean equals (Object o) {
CellSignalStrengthLte s;
try {
s = (CellSignalStrengthLte) o;
} catch (ClassCastException ex) {
return false;
}
if (o == null) {
return false;
}
return mSignalStrength == s.mSignalStrength
&& mRsrp == s.mRsrp
&& mRsrq == s.mRsrq
&& mRssnr == s.mRssnr
&& mCqi == s.mCqi
&& mTimingAdvance == s.mTimingAdvance;
}
/**
* @return string representation.
*/
@Override
public String toString() {
return "CellSignalStrengthLte:"
+ " ss=" + mSignalStrength
+ " rsrp=" + mRsrp
+ " rsrq=" + mRsrq
+ " rssnr=" + mRssnr
+ " cqi=" + mCqi
+ " ta=" + mTimingAdvance;
}
/** Implement the Parcelable interface */
@Override
public void writeToParcel(Parcel dest, int flags) {
if (DBG) log("writeToParcel(Parcel, int): " + toString());
dest.writeInt(mSignalStrength);
// Need to multiply rsrp and rsrq by -1
// to ensure consistency when reading values written here
dest.writeInt(mRsrp * -1);
dest.writeInt(mRsrq * -1);
dest.writeInt(mRssnr);
dest.writeInt(mCqi);
dest.writeInt(mTimingAdvance);
}
/**
* Construct a SignalStrength object from the given parcel
* where the token is already been processed.
*/
private CellSignalStrengthLte(Parcel in) {
mSignalStrength = in.readInt();
// rsrp and rsrq are written into the parcel as positive values.
// Need to convert into negative values
mRsrp = in.readInt() * -1;
mRsrq = in.readInt() * -1;
mRssnr = in.readInt();
mCqi = in.readInt();
mTimingAdvance = in.readInt();
if (DBG) log("CellSignalStrengthLte(Parcel): " + toString());
}
/** Implement the Parcelable interface */
@Override
public int describeContents() {
return 0;
}
/** Implement the Parcelable interface */
@SuppressWarnings("hiding")
public static final Parcelable.Creator<CellSignalStrengthLte> CREATOR =
new Parcelable.Creator<CellSignalStrengthLte>() {
@Override
public CellSignalStrengthLte createFromParcel(Parcel in) {
return new CellSignalStrengthLte(in);
}
@Override
public CellSignalStrengthLte[] newArray(int size) {
return new CellSignalStrengthLte[size];
}
};
/**
* log
*/
private static void log(String s) {
Rlog.w(LOG_TAG, s);
}
}
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