1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.telephony; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 import android.telephony.Rlog; 22 23 /** 24 * LTE signal strength related information. 25 */ 26 public final class CellSignalStrengthLte extends CellSignalStrength implements Parcelable { 27 28 private static final String LOG_TAG = "CellSignalStrengthLte"; 29 private static final boolean DBG = false; 30 31 private int mSignalStrength; 32 private int mRsrp; 33 private int mRsrq; 34 private int mRssnr; 35 private int mCqi; 36 private int mTimingAdvance; 37 38 /** 39 * Empty constructor 40 * 41 * @hide 42 */ 43 public CellSignalStrengthLte() { 44 setDefaultValues(); 45 } 46 47 /** 48 * Constructor 49 * 50 * @hide 51 */ 52 public CellSignalStrengthLte(int signalStrength, int rsrp, int rsrq, int rssnr, int cqi, 53 int timingAdvance) { 54 initialize(signalStrength, rsrp, rsrq, rssnr, cqi, timingAdvance); 55 } 56 57 /** 58 * Copy constructors 59 * 60 * @param s Source SignalStrength 61 * 62 * @hide 63 */ 64 public CellSignalStrengthLte(CellSignalStrengthLte s) { 65 copyFrom(s); 66 } 67 68 /** 69 * Initialize all the values 70 * 71 * @param lteSignalStrength 72 * @param rsrp 73 * @param rsrq 74 * @param rssnr 75 * @param cqi 76 * 77 * @hide 78 */ 79 public void initialize(int lteSignalStrength, int rsrp, int rsrq, int rssnr, int cqi, 80 int timingAdvance) { 81 mSignalStrength = lteSignalStrength; 82 mRsrp = rsrp; 83 mRsrq = rsrq; 84 mRssnr = rssnr; 85 mCqi = cqi; 86 mTimingAdvance = timingAdvance; 87 } 88 89 /** 90 * Initialize from the SignalStrength structure. 91 * 92 * @param ss 93 * 94 * @hide 95 */ 96 public void initialize(SignalStrength ss, int timingAdvance) { 97 mSignalStrength = ss.getLteSignalStrength(); 98 mRsrp = ss.getLteRsrp(); 99 mRsrq = ss.getLteRsrq(); 100 mRssnr = ss.getLteRssnr(); 101 mCqi = ss.getLteCqi(); 102 mTimingAdvance = timingAdvance; 103 } 104 105 /** 106 * @hide 107 */ 108 protected void copyFrom(CellSignalStrengthLte s) { 109 mSignalStrength = s.mSignalStrength; 110 mRsrp = s.mRsrp; 111 mRsrq = s.mRsrq; 112 mRssnr = s.mRssnr; 113 mCqi = s.mCqi; 114 mTimingAdvance = s.mTimingAdvance; 115 } 116 117 /** 118 * @hide 119 */ 120 @Override 121 public CellSignalStrengthLte copy() { 122 return new CellSignalStrengthLte(this); 123 } 124 125 /** @hide */ 126 @Override 127 public void setDefaultValues() { 128 mSignalStrength = Integer.MAX_VALUE; 129 mRsrp = Integer.MAX_VALUE; 130 mRsrq = Integer.MAX_VALUE; 131 mRssnr = Integer.MAX_VALUE; 132 mCqi = Integer.MAX_VALUE; 133 mTimingAdvance = Integer.MAX_VALUE; 134 } 135 136 /** 137 * Get signal level as an int from 0..4 138 */ 139 @Override 140 public int getLevel() { 141 int levelRsrp = 0; 142 int levelRssnr = 0; 143 144 if (mRsrp == Integer.MAX_VALUE) levelRsrp = 0; 145 else if (mRsrp >= -95) levelRsrp = SIGNAL_STRENGTH_GREAT; 146 else if (mRsrp >= -105) levelRsrp = SIGNAL_STRENGTH_GOOD; 147 else if (mRsrp >= -115) levelRsrp = SIGNAL_STRENGTH_MODERATE; 148 else levelRsrp = SIGNAL_STRENGTH_POOR; 149 150 // See RIL_LTE_SignalStrength in ril.h 151 if (mRssnr == Integer.MAX_VALUE) levelRssnr = 0; 152 else if (mRssnr >= 45) levelRssnr = SIGNAL_STRENGTH_GREAT; 153 else if (mRssnr >= 10) levelRssnr = SIGNAL_STRENGTH_GOOD; 154 else if (mRssnr >= -30) levelRssnr = SIGNAL_STRENGTH_MODERATE; 155 else levelRssnr = SIGNAL_STRENGTH_POOR; 156 157 int level; 158 if (mRsrp == Integer.MAX_VALUE) 159 level = levelRssnr; 160 else if (mRssnr == Integer.MAX_VALUE) 161 level = levelRsrp; 162 else 163 level = (levelRssnr < levelRsrp) ? levelRssnr : levelRsrp; 164 165 if (DBG) log("Lte rsrp level: " + levelRsrp 166 + " snr level: " + levelRssnr + " level: " + level); 167 return level; 168 } 169 170 /** 171 * Get signal strength as dBm 172 */ 173 @Override 174 public int getDbm() { 175 return mRsrp; 176 } 177 178 /** 179 * Get the LTE signal level as an asu value between 0..97, 99 is unknown 180 * Asu is calculated based on 3GPP RSRP. Refer to 3GPP 27.007 (Ver 10.3.0) Sec 8.69 181 */ 182 @Override 183 public int getAsuLevel() { 184 int lteAsuLevel = 99; 185 int lteDbm = getDbm(); 186 if (lteDbm <= -140) lteAsuLevel = 0; 187 else if (lteDbm >= -43) lteAsuLevel = 97; 188 else lteAsuLevel = lteDbm + 140; 189 if (DBG) log("Lte Asu level: "+lteAsuLevel); 190 return lteAsuLevel; 191 } 192 193 /** 194 * Get the timing advance value for LTE. 195 * See 3GPP xxxx 196 */ 197 public int getTimingAdvance() { 198 return mTimingAdvance; 199 } 200 201 @Override 202 public int hashCode() { 203 int primeNum = 31; 204 return (mSignalStrength * primeNum) + (mRsrp * primeNum) 205 + (mRsrq * primeNum) + (mRssnr * primeNum) + (mCqi * primeNum) 206 + (mTimingAdvance * primeNum); 207 } 208 209 @Override 210 public boolean equals (Object o) { 211 CellSignalStrengthLte s; 212 213 try { 214 s = (CellSignalStrengthLte) o; 215 } catch (ClassCastException ex) { 216 return false; 217 } 218 219 if (o == null) { 220 return false; 221 } 222 223 return mSignalStrength == s.mSignalStrength 224 && mRsrp == s.mRsrp 225 && mRsrq == s.mRsrq 226 && mRssnr == s.mRssnr 227 && mCqi == s.mCqi 228 && mTimingAdvance == s.mTimingAdvance; 229 } 230 231 /** 232 * @return string representation. 233 */ 234 @Override 235 public String toString() { 236 return "CellSignalStrengthLte:" 237 + " ss=" + mSignalStrength 238 + " rsrp=" + mRsrp 239 + " rsrq=" + mRsrq 240 + " rssnr=" + mRssnr 241 + " cqi=" + mCqi 242 + " ta=" + mTimingAdvance; 243 } 244 245 /** Implement the Parcelable interface */ 246 @Override 247 public void writeToParcel(Parcel dest, int flags) { 248 if (DBG) log("writeToParcel(Parcel, int): " + toString()); 249 dest.writeInt(mSignalStrength); 250 // Need to multiply rsrp and rsrq by -1 251 // to ensure consistency when reading values written here 252 dest.writeInt(mRsrp * -1); 253 dest.writeInt(mRsrq * -1); 254 dest.writeInt(mRssnr); 255 dest.writeInt(mCqi); 256 dest.writeInt(mTimingAdvance); 257 } 258 259 /** 260 * Construct a SignalStrength object from the given parcel 261 * where the token is already been processed. 262 */ 263 private CellSignalStrengthLte(Parcel in) { 264 mSignalStrength = in.readInt(); 265 // rsrp and rsrq are written into the parcel as positive values. 266 // Need to convert into negative values 267 mRsrp = in.readInt() * -1; 268 mRsrq = in.readInt() * -1; 269 mRssnr = in.readInt(); 270 mCqi = in.readInt(); 271 mTimingAdvance = in.readInt(); 272 if (DBG) log("CellSignalStrengthLte(Parcel): " + toString()); 273 } 274 275 /** Implement the Parcelable interface */ 276 @Override 277 public int describeContents() { 278 return 0; 279 } 280 281 /** Implement the Parcelable interface */ 282 @SuppressWarnings("hiding") 283 public static final Parcelable.Creator<CellSignalStrengthLte> CREATOR = 284 new Parcelable.Creator<CellSignalStrengthLte>() { 285 @Override 286 public CellSignalStrengthLte createFromParcel(Parcel in) { 287 return new CellSignalStrengthLte(in); 288 } 289 290 @Override 291 public CellSignalStrengthLte[] newArray(int size) { 292 return new CellSignalStrengthLte[size]; 293 } 294 }; 295 296 /** 297 * log 298 */ 299 private static void log(String s) { 300 Rlog.w(LOG_TAG, s); 301 } 302 } 303
