| /* |
| * 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 android.telephony.Rlog; |
| |
| import java.util.Objects; |
| |
| /** |
| * GSM signal strength related information. |
| */ |
| public final class CellSignalStrengthGsm extends CellSignalStrength implements Parcelable { |
| |
| private static final String LOG_TAG = "CellSignalStrengthGsm"; |
| private static final boolean DBG = false; |
| |
| private static final int GSM_SIGNAL_STRENGTH_GREAT = 12; |
| private static final int GSM_SIGNAL_STRENGTH_GOOD = 8; |
| private static final int GSM_SIGNAL_STRENGTH_MODERATE = 5; |
| |
| @UnsupportedAppUsage |
| private int mSignalStrength; // in ASU; Valid values are (0-31, 99) as defined in TS 27.007 8.5 |
| @UnsupportedAppUsage |
| private int mBitErrorRate; // bit error rate (0-7, 99) as defined in TS 27.007 8.5 |
| @UnsupportedAppUsage |
| private int mTimingAdvance; // range from 0-219 or CellInfo.UNAVAILABLE if unknown |
| |
| /** @hide */ |
| @UnsupportedAppUsage |
| public CellSignalStrengthGsm() { |
| setDefaultValues(); |
| } |
| |
| /** @hide */ |
| public CellSignalStrengthGsm(int ss, int ber) { |
| this(ss, ber, CellInfo.UNAVAILABLE); |
| } |
| |
| /** @hide */ |
| public CellSignalStrengthGsm(int ss, int ber, int ta) { |
| mSignalStrength = ss; |
| mBitErrorRate = ber; |
| mTimingAdvance = ta; |
| } |
| |
| /** @hide */ |
| public CellSignalStrengthGsm(CellSignalStrengthGsm s) { |
| copyFrom(s); |
| } |
| |
| /** @hide */ |
| protected void copyFrom(CellSignalStrengthGsm s) { |
| mSignalStrength = s.mSignalStrength; |
| mBitErrorRate = s.mBitErrorRate; |
| mTimingAdvance = s.mTimingAdvance; |
| } |
| |
| /** @hide */ |
| @Override |
| public CellSignalStrengthGsm copy() { |
| return new CellSignalStrengthGsm(this); |
| } |
| |
| /** @hide */ |
| @Override |
| public void setDefaultValues() { |
| mSignalStrength = CellInfo.UNAVAILABLE; |
| mBitErrorRate = 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 level; |
| |
| // ASU ranges from 0 to 31 - TS 27.007 Sec 8.5 |
| // asu = 0 (-113dB or less) is very weak |
| // signal, its better to show 0 bars to the user in such cases. |
| // asu = 99 is a special case, where the signal strength is unknown. |
| int asu = mSignalStrength; |
| if (asu <= 2 || asu == 99) level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN; |
| else if (asu >= GSM_SIGNAL_STRENGTH_GREAT) level = SIGNAL_STRENGTH_GREAT; |
| else if (asu >= GSM_SIGNAL_STRENGTH_GOOD) level = SIGNAL_STRENGTH_GOOD; |
| else if (asu >= GSM_SIGNAL_STRENGTH_MODERATE) level = SIGNAL_STRENGTH_MODERATE; |
| else level = SIGNAL_STRENGTH_POOR; |
| if (DBG) log("getLevel=" + level); |
| return level; |
| } |
| |
| /** |
| * Get the GSM timing advance between 0..219 symbols (normally 0..63). |
| * <p>{@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} is reported when there is no RR |
| * connection. Refer to 3GPP 45.010 Sec 5.8. |
| * |
| * @return the current GSM timing advance, if available. |
| */ |
| public int getTimingAdvance() { |
| return mTimingAdvance; |
| } |
| |
| /** |
| * Get the signal strength as dBm |
| */ |
| @Override |
| public int getDbm() { |
| int dBm; |
| |
| int level = mSignalStrength; |
| int asu = (level == 99 ? CellInfo.UNAVAILABLE : level); |
| if (asu != CellInfo.UNAVAILABLE) { |
| dBm = -113 + (2 * asu); |
| } else { |
| dBm = CellInfo.UNAVAILABLE; |
| } |
| if (DBG) log("getDbm=" + dBm); |
| return dBm; |
| } |
| |
| /** |
| * Get the signal level as an asu value between 0..31, 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() { |
| // ASU ranges from 0 to 31 - TS 27.007 Sec 8.5 |
| // asu = 0 (-113dB or less) is very weak |
| // signal, its better to show 0 bars to the user in such cases. |
| // asu = 99 is a special case, where the signal strength is unknown. |
| int level = mSignalStrength; |
| if (DBG) log("getAsuLevel=" + level); |
| return level; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(mSignalStrength, mBitErrorRate, mTimingAdvance); |
| } |
| |
| @Override |
| public boolean equals (Object o) { |
| CellSignalStrengthGsm s; |
| |
| try { |
| s = (CellSignalStrengthGsm) o; |
| } catch (ClassCastException ex) { |
| return false; |
| } |
| |
| if (o == null) { |
| return false; |
| } |
| |
| return mSignalStrength == s.mSignalStrength && mBitErrorRate == s.mBitErrorRate && |
| s.mTimingAdvance == mTimingAdvance; |
| } |
| |
| /** |
| * @return string representation. |
| */ |
| @Override |
| public String toString() { |
| return "CellSignalStrengthGsm:" |
| + " ss=" + mSignalStrength |
| + " ber=" + mBitErrorRate |
| + " mTa=" + mTimingAdvance; |
| } |
| |
| /** Implement the Parcelable interface */ |
| @Override |
| public void writeToParcel(Parcel dest, int flags) { |
| if (DBG) log("writeToParcel(Parcel, int): " + toString()); |
| dest.writeInt(mSignalStrength); |
| dest.writeInt(mBitErrorRate); |
| dest.writeInt(mTimingAdvance); |
| } |
| |
| /** |
| * Construct a SignalStrength object from the given parcel |
| * where the token is already been processed. |
| */ |
| private CellSignalStrengthGsm(Parcel in) { |
| mSignalStrength = in.readInt(); |
| mBitErrorRate = in.readInt(); |
| mTimingAdvance = in.readInt(); |
| if (DBG) log("CellSignalStrengthGsm(Parcel): " + toString()); |
| } |
| |
| /** Implement the Parcelable interface */ |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| /** Implement the Parcelable interface */ |
| @SuppressWarnings("hiding") |
| public static final Parcelable.Creator<CellSignalStrengthGsm> CREATOR = |
| new Parcelable.Creator<CellSignalStrengthGsm>() { |
| @Override |
| public CellSignalStrengthGsm createFromParcel(Parcel in) { |
| return new CellSignalStrengthGsm(in); |
| } |
| |
| @Override |
| public CellSignalStrengthGsm[] newArray(int size) { |
| return new CellSignalStrengthGsm[size]; |
| } |
| }; |
| |
| /** |
| * log |
| */ |
| private static void log(String s) { |
| Rlog.w(LOG_TAG, s); |
| } |
| } |