| /* |
| * 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.annotation.UnsupportedAppUsage; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.util.Objects; |
| |
| /** |
| * 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; |
| |
| /** |
| * 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 |
| private int mSignalStrength; |
| @UnsupportedAppUsage |
| private int mRsrp; |
| @UnsupportedAppUsage |
| private int mRsrq; |
| @UnsupportedAppUsage |
| private int mRssnr; |
| @UnsupportedAppUsage |
| private int mCqi; |
| @UnsupportedAppUsage |
| private int mTimingAdvance; |
| |
| /** @hide */ |
| @UnsupportedAppUsage |
| public CellSignalStrengthLte() { |
| setDefaultValues(); |
| } |
| |
| /** @hide */ |
| public CellSignalStrengthLte(int signalStrength, int rsrp, int rsrq, int rssnr, int cqi, |
| int timingAdvance) { |
| mSignalStrength = signalStrength; |
| mRsrp = rsrp; |
| mRsrq = rsrq; |
| mRssnr = rssnr; |
| mCqi = cqi; |
| mTimingAdvance = timingAdvance; |
| } |
| |
| /** @hide */ |
| public CellSignalStrengthLte(CellSignalStrengthLte s) { |
| copyFrom(s); |
| } |
| |
| /** @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 = CellInfo.UNAVAILABLE; |
| mRsrp = CellInfo.UNAVAILABLE; |
| mRsrq = CellInfo.UNAVAILABLE; |
| mRssnr = CellInfo.UNAVAILABLE; |
| mCqi = CellInfo.UNAVAILABLE; |
| mTimingAdvance = CellInfo.UNAVAILABLE; |
| } |
| |
| /** |
| * Retrieve an abstract level value for the overall signal strength. |
| * |
| * @return a single integer from 0 to 4 representing the general signal quality. |
| * 0 represents very poor signal strength while 4 represents a very strong signal strength. |
| */ |
| @Override |
| public int getLevel() { |
| int levelRsrp = 0; |
| int levelRssnr = 0; |
| |
| if (mRsrp == CellInfo.UNAVAILABLE) 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 == CellInfo.UNAVAILABLE) 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 == CellInfo.UNAVAILABLE) { |
| level = levelRssnr; |
| } else if (mRssnr == CellInfo.UNAVAILABLE) { |
| level = levelRsrp; |
| } else { |
| level = (levelRssnr < levelRsrp) ? levelRssnr : levelRsrp; |
| } |
| |
| if (DBG) log("Lte rsrp level: " + levelRsrp |
| + " snr level: " + levelRssnr + " level: " + level); |
| return level; |
| } |
| |
| /** |
| * Get reference signal received quality |
| * |
| * @return the RSRQ if available or |
| * {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable. |
| */ |
| public int getRsrq() { |
| 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 |
| * |
| * @return the RSSNR if available or |
| * {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable. |
| */ |
| public int getRssnr() { |
| return mRssnr; |
| } |
| |
| /** |
| * Get reference signal received power in dBm |
| * |
| * @return the RSRP of the measured cell. |
| */ |
| public int getRsrp() { |
| return mRsrp; |
| } |
| |
| /** |
| * Get channel quality indicator |
| * |
| * @return the CQI if available or |
| * {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable. |
| */ |
| public int getCqi() { |
| return mCqi; |
| } |
| |
| /** |
| * Get signal strength in dBm |
| * |
| * @return the RSRP of the measured cell. |
| */ |
| @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 == CellInfo.UNAVAILABLE) lteAsuLevel = 99; |
| else 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, as a value in range of 0..1282. |
| * {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} is reported when there is no |
| * active RRC connection. Refer to 3GPP 36.213 Sec 4.2.3 |
| * |
| * @return the LTE timing advance if available or |
| * {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable. |
| */ |
| public int getTimingAdvance() { |
| return mTimingAdvance; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(mSignalStrength, mRsrp, mRsrq, mRssnr, mCqi, mTimingAdvance); |
| } |
| |
| @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 |
| // unless the values are invalid |
| dest.writeInt(mRsrp * (mRsrp != CellInfo.UNAVAILABLE ? -1 : 1)); |
| dest.writeInt(mRsrq * (mRsrq != CellInfo.UNAVAILABLE ? -1 : 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 unless the values are invalid |
| mRsrp = in.readInt(); |
| if (mRsrp != CellInfo.UNAVAILABLE) mRsrp *= -1; |
| mRsrq = in.readInt(); |
| if (mRsrq != CellInfo.UNAVAILABLE) mRsrq *= -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); |
| } |
| |
| 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); |
| } |
| } |