Merge "Integrate Signal Threshold for 5G"

api/current.txt

@@ -44266,7 +44266,6 @@ package android.telephony {
     field public static final String KEY_OPPORTUNISTIC_NETWORK_ENTRY_THRESHOLD_RSSNR_INT = "opportunistic_network_entry_threshold_rssnr_int";
     field public static final String KEY_OPPORTUNISTIC_NETWORK_EXIT_THRESHOLD_RSRP_INT = "opportunistic_network_exit_threshold_rsrp_int";
     field public static final String KEY_OPPORTUNISTIC_NETWORK_EXIT_THRESHOLD_RSSNR_INT = "opportunistic_network_exit_threshold_rssnr_int";
-    field public static final String KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT = "parameters_use_for_5g_nr_signal_bar_int";
     field public static final String KEY_PREFER_2G_BOOL = "prefer_2g_bool";
     field public static final String KEY_PREVENT_CLIR_ACTIVATION_AND_DEACTIVATION_CODE_BOOL = "prevent_clir_activation_and_deactivation_code_bool";
     field public static final String KEY_RADIO_RESTART_FAILURE_CAUSES_INT_ARRAY = "radio_restart_failure_causes_int_array";

telephony/java/android/telephony/CarrierConfigManager.java

@@ -2323,7 +2323,7 @@ public class CarrierConfigManager {
      * Reference: 3GPP TS 38.215
      *
      * 4 threshold integers must be within the boundaries [-20 dB, -3 dB], and the levels are:
-     *     "NONE: [-23, threshold1]"
+     *     "NONE: [-20, threshold1]"
      *     "POOR: (threshold1, threshold2]"
      *     "MODERATE: (threshold2, threshold3]"
      *     "GOOD:  (threshold3, threshold4]"
@@ -2357,15 +2357,26 @@ public class CarrierConfigManager {
     /**
      * Bit-field integer to determine whether to use SS reference signal received power (SSRSRP),
      * SS reference signal received quality (SSRSRQ), or/and SS signal-to-noise and interference
-     * ratio (SSSINR) for the number of 5G NR signal bars. If multiple measures are set bit, the
+     * ratio (SSSINR) for the number of 5G NR signal bars and signal criteria reporting enabling.
-     * parameter whose value is smallest is used to indicate the signal bar.
+     *
+     * <p> If a measure is not set, signal criteria reporting from modem will not be triggered and
+     * not be used for calculating signal level. If multiple measures are set bit, the parameter
+     * whose value is smallest is used to indicate the signal level.
      *
      *  SSRSRP = 1 << 0,
      *  SSRSRQ = 1 << 1,
      *  SSSINR = 1 << 2,
      *
+     *  The value of this key must be bitwise OR of {@link CellSignalStrengthNr#USE_SSRSRP},
+     *  {@link CellSignalStrengthNr#USE_SSRSRQ}, {@link CellSignalStrengthNr#USE_SSSINR}.
+     *
+     * For example, if both SSRSRP and SSSINR are used, the value of key is 5 (1 << 0 | 1 << 2).
+     * If the key is invalid or not configured, a default value (SSRSRP = 1 << 0) will apply.
+     *
      *  Reference: 3GPP TS 38.215,
      *             3GPP TS 38.133 10.1.16.1
+     *
+     * @hide
      */
     public static final String KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT =
             "parameters_use_for_5g_nr_signal_bar_int";
@@ -3692,6 +3703,32 @@ public class CarrierConfigManager {
                         -95, /* SIGNAL_STRENGTH_GOOD */
                         -85  /* SIGNAL_STRENGTH_GREAT */
                 });
+        sDefaults.putIntArray(KEY_5G_NR_SSRSRP_THRESHOLDS_INT_ARRAY,
+                // Boundaries: [-140 dB, -44 dB]
+                new int[] {
+                    -125, /* SIGNAL_STRENGTH_POOR */
+                    -115, /* SIGNAL_STRENGTH_MODERATE */
+                    -105, /* SIGNAL_STRENGTH_GOOD */
+                    -95,  /* SIGNAL_STRENGTH_GREAT */
+                });
+        sDefaults.putIntArray(KEY_5G_NR_SSRSRQ_THRESHOLDS_INT_ARRAY,
+                // Boundaries: [-20 dB, -3 dB]
+                new int[] {
+                    -14, /* SIGNAL_STRENGTH_POOR */
+                    -12, /* SIGNAL_STRENGTH_MODERATE */
+                    -10, /* SIGNAL_STRENGTH_GOOD */
+                    -8  /* SIGNAL_STRENGTH_GREAT */
+                });
+        sDefaults.putIntArray(KEY_5G_NR_SSSINR_THRESHOLDS_INT_ARRAY,
+                // Boundaries: [-23 dB, 40 dB]
+                new int[] {
+                    -8, /* SIGNAL_STRENGTH_POOR */
+                    0, /* SIGNAL_STRENGTH_MODERATE */
+                    8, /* SIGNAL_STRENGTH_GOOD */
+                    16  /* SIGNAL_STRENGTH_GREAT */
+                });
+        sDefaults.putInt(KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT,
+                CellSignalStrengthNr.USE_SSRSRP);
         sDefaults.putString(KEY_WCDMA_DEFAULT_SIGNAL_STRENGTH_MEASUREMENT_STRING, "rssi");
         sDefaults.putBoolean(KEY_CONFIG_SHOW_ORIG_DIAL_STRING_FOR_CDMA_BOOL, false);
         sDefaults.putBoolean(KEY_SHOW_CALL_BLOCKING_DISABLED_NOTIFICATION_ALWAYS_BOOL, false);

telephony/java/android/telephony/CellSignalStrengthNr.java

@@ -16,11 +16,15 @@
 
 package android.telephony;
 
+import android.annotation.IntDef;
 import android.annotation.IntRange;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.os.PersistableBundle;
 
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.Arrays;
 import java.util.Objects;
 
 /**
@@ -36,13 +40,67 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
 
     private static final String TAG = "CellSignalStrengthNr";
 
+    // Lifted from Default carrier configs and max range of SSRSRP
+    // Boundaries: [-140 dB, -44 dB]
+    private int[] mSsRsrpThresholds = new int[] {
+            -125, /* SIGNAL_STRENGTH_POOR */
+            -115, /* SIGNAL_STRENGTH_MODERATE */
+            -105, /* SIGNAL_STRENGTH_GOOD */
+            -95,  /* SIGNAL_STRENGTH_GREAT */
+    };
+
+    // Lifted from Default carrier configs and max range of SSRSRQ
+    // Boundaries: [-20 dB, -3 dB]
+    private int[] mSsRsrqThresholds = new int[] {
+            -14, /* SIGNAL_STRENGTH_POOR */
+            -12, /* SIGNAL_STRENGTH_MODERATE */
+            -10, /* SIGNAL_STRENGTH_GOOD */
+            -8  /* SIGNAL_STRENGTH_GREAT */
+    };
+
+    // Lifted from Default carrier configs and max range of SSSINR
+    // Boundaries: [-23 dB, 40 dB]
+    private int[] mSsSinrThresholds = new int[] {
+            -8, /* SIGNAL_STRENGTH_POOR */
+            0, /* SIGNAL_STRENGTH_MODERATE */
+            8, /* SIGNAL_STRENGTH_GOOD */
+            16  /* SIGNAL_STRENGTH_GREAT */
+    };
+
     /**
-     * These threshold values are copied from LTE.
+     * Indicates SSRSRP is considered for {@link #getLevel()} and reporting from modem.
-     * TODO: make it configurable via CarrierConfig.
+     *
+     * @hide
      */
-    private static final int SIGNAL_GREAT_THRESHOLD = -95;
+    public static final int USE_SSRSRP = 1 << 0;
-    private static final int SIGNAL_GOOD_THRESHOLD = -105;
+    /**
-    private static final int SIGNAL_MODERATE_THRESHOLD = -115;
+     * Indicates SSRSRQ is considered for {@link #getLevel()} and reporting from modem.
+     *
+     * @hide
+     */
+    public static final int USE_SSRSRQ = 1 << 1;
+    /**
+     * Indicates SSSINR is considered for {@link #getLevel()} and reporting from modem.
+     *
+     * @hide
+     */
+    public static final int USE_SSSINR = 1 << 2;
+
+    /**
+     * Bit-field integer to determine whether to use SS reference signal received power (SSRSRP),
+     * SS reference signal received quality (SSRSRQ), or/and SS signal-to-noise and interference
+     * ratio (SSSINR) for the number of 5G NR signal bars. If multiple measures are set bit, the
+     * parameter whose value is smallest is used to indicate the signal bar.
+     *
+     * @hide
+     */
+    @IntDef(flag = true, prefix = { "USE_" }, value = {
+        USE_SSRSRP,
+        USE_SSRSRQ,
+        USE_SSSINR
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface SignalLevelAndReportCriteriaSource {}
 
     private int mCsiRsrp;
     private int mCsiRsrq;
@@ -52,6 +110,21 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
     private int mSsSinr;
     private int mLevel;
 
+    /**
+     * Bit-field integer to determine whether to use SS reference signal received power (SSRSRP),
+     * SS reference signal received quality (SSRSRQ), or/and SS signal-to-noise and interference
+     * ratio (SSSINR) for the number of 5G NR signal bars. If multiple measures are set bit, the
+     * parameter whose value is smallest is used to indicate the signal bar.
+     *
+     *  SSRSRP = 1 << 0,
+     *  SSRSRQ = 1 << 1,
+     *  SSSINR = 1 << 2,
+     *
+     * For example, if both SSRSRP and SSSINR are used, the value of key is 5 (1 << 0 | 1 << 2).
+     * If the key is invalid or not configured, a default value (SSRSRP = 1 << 0) will apply.
+     */
+    private int mParametersUseForLevel;
+
     /** @hide */
     public CellSignalStrengthNr() {
         setDefaultValues();
@@ -182,6 +255,7 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
         mSsRsrq = CellInfo.UNAVAILABLE;
         mSsSinr = CellInfo.UNAVAILABLE;
         mLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+        mParametersUseForLevel = USE_SSRSRP;
     }
 
     /** {@inheritDoc} */
@@ -191,20 +265,83 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
         return mLevel;
     }
 
+    /**
+     * Checks if the given parameter type is considered to use for {@link #getLevel()}.
+     *
+     * Note: if multiple parameter types are considered, the smaller level for one of the
+     * parameters would be returned by {@link #getLevel()}
+     *
+     * @param parameterType bitwise OR of {@link #USE_SSRSRP}, {@link #USE_SSRSRQ},
+     *         {@link #USE_SSSINR}
+     * @return {@code true} if the level is calculated based on the given parameter type;
+     *      {@code false} otherwise.
+     *
+     */
+    private boolean isLevelForParameter(@SignalLevelAndReportCriteriaSource int parameterType) {
+        return (parameterType & mParametersUseForLevel) == parameterType;
+    }
+
     /** @hide */
     @Override
     public void updateLevel(PersistableBundle cc, ServiceState ss) {
-        if (mSsRsrp == CellInfo.UNAVAILABLE) {
+        if (cc == null) {
-            mLevel = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+            mParametersUseForLevel = USE_SSRSRP;
-        } else if (mSsRsrp >= SIGNAL_GREAT_THRESHOLD) {
-            mLevel = SIGNAL_STRENGTH_GREAT;
-        } else if (mSsRsrp >= SIGNAL_GOOD_THRESHOLD) {
-            mLevel = SIGNAL_STRENGTH_GOOD;
-        } else if (mSsRsrp >= SIGNAL_MODERATE_THRESHOLD) {
-            mLevel = SIGNAL_STRENGTH_MODERATE;
         } else {
-            mLevel = SIGNAL_STRENGTH_POOR;
+            mParametersUseForLevel = cc.getInt(
+                    CarrierConfigManager.KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT, USE_SSRSRP);
+            Rlog.i(TAG, "Using SSRSRP for Level.");
+            mSsRsrpThresholds = cc.getIntArray(
+                    CarrierConfigManager.KEY_5G_NR_SSRSRP_THRESHOLDS_INT_ARRAY);
+            Rlog.i(TAG, "Applying 5G NR SSRSRP Thresholds: " + Arrays.toString(mSsRsrpThresholds));
+            mSsRsrqThresholds = cc.getIntArray(
+                    CarrierConfigManager.KEY_5G_NR_SSRSRQ_THRESHOLDS_INT_ARRAY);
+            Rlog.i(TAG, "Applying 5G NR SSRSRQ Thresholds: " + Arrays.toString(mSsRsrqThresholds));
+            mSsSinrThresholds = cc.getIntArray(
+                    CarrierConfigManager.KEY_5G_NR_SSSINR_THRESHOLDS_INT_ARRAY);
+            Rlog.i(TAG, "Applying 5G NR SSSINR Thresholds: " + Arrays.toString(mSsSinrThresholds));
         }
+        int ssRsrpLevel = SignalStrength.INVALID;
+        int ssRsrqLevel = SignalStrength.INVALID;
+        int ssSinrLevel = SignalStrength.INVALID;
+        if (isLevelForParameter(USE_SSRSRP)) {
+            ssRsrpLevel = updateLevelWithMeasure(mSsRsrp, mSsRsrpThresholds);
+            Rlog.i(TAG, "Updated 5G NR SSRSRP Level: " + ssRsrpLevel);
+        }
+        if (isLevelForParameter(USE_SSRSRQ)) {
+            ssRsrqLevel = updateLevelWithMeasure(mSsRsrq, mSsRsrqThresholds);
+            Rlog.i(TAG, "Updated 5G NR SSRSRQ Level: " + ssRsrqLevel);
+        }
+        if (isLevelForParameter(USE_SSSINR)) {
+            ssSinrLevel = updateLevelWithMeasure(mSsSinr, mSsSinrThresholds);
+            Rlog.i(TAG, "Updated 5G NR SSSINR Level: " + ssSinrLevel);
+        }
+        // Apply the smaller value among three levels of three measures.
+        mLevel = Math.min(Math.min(ssRsrpLevel, ssRsrqLevel), ssSinrLevel);
+    }
+
+    /**
+     * Update level with corresponding measure and thresholds.
+     *
+     * @param measure corresponding signal measure
+     * @param thresholds corresponding signal thresholds
+     * @return level of the signal strength
+     */
+    private int updateLevelWithMeasure(int measure, int[] thresholds) {
+        int level;
+        if (measure == CellInfo.UNAVAILABLE) {
+            level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+        } else if (measure > thresholds[3]) {
+            level = SIGNAL_STRENGTH_GREAT;
+        } else if (measure > thresholds[2]) {
+            level = SIGNAL_STRENGTH_GOOD;
+        } else if (measure > thresholds[1]) {
+            level = SIGNAL_STRENGTH_MODERATE;
+        }  else if (measure > thresholds[0]) {
+            level = SIGNAL_STRENGTH_POOR;
+        } else {
+            level = SIGNAL_STRENGTH_NONE_OR_UNKNOWN;
+        }
+        return level;
     }
 
     /**
@@ -247,6 +384,7 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
         mSsRsrq = s.mSsRsrq;
         mSsSinr = s.mSsSinr;
         mLevel = s.mLevel;
+        mParametersUseForLevel = s.mParametersUseForLevel;
     }
 
     /** @hide */
@@ -290,6 +428,7 @@ public final class CellSignalStrengthNr extends CellSignalStrength implements Pa
                 .append(" ssRsrq = " + mSsRsrq)
                 .append(" ssSinr = " + mSsSinr)
                 .append(" level = " + mLevel)
+                .append(" parametersUseForLevel = " + mParametersUseForLevel)
                 .append(" }")
                 .toString();
     }

telephony/java/android/telephony/SignalThresholdInfo.java

@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2019 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.IntDef;
+import android.annotation.NonNull;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.util.Arrays;
+import java.util.Objects;
+
+/**
+ * Defines the threshold value of the signal strength.
+ * @hide
+ */
+public class SignalThresholdInfo implements Parcelable {
+    /**
+     * Received Signal Strength Indication.
+     * Range: -113 dBm and -51 dBm
+     * Used RAN: GERAN, CDMA2000
+     * Reference: 3GPP TS 27.007 section 8.5.
+     */
+    public static final int SIGNAL_RSSI = 1;
+
+    /**
+     * Received Signal Code Power.
+     * Range: -120 dBm to -25 dBm;
+     * Used RAN: UTRAN
+     * Reference: 3GPP TS 25.123, section 9.1.1.1
+     */
+    public static final int SIGNAL_RSCP = 2;
+
+    /**
+     * Reference Signal Received Power.
+     * Range: -140 dBm to -44 dBm;
+     * Used RAN: EUTRAN
+     * Reference: 3GPP TS 36.133 9.1.4
+     */
+    public static final int SIGNAL_RSRP = 3;
+
+    /**
+     * Reference Signal Received Quality
+     * Range: -20 dB to -3 dB;
+     * Used RAN: EUTRAN
+     * Reference: 3GPP TS 36.133 9.1.7
+     */
+    public static final int SIGNAL_RSRQ = 4;
+
+    /**
+     * Reference Signal Signal to Noise Ratio
+     * Range: -20 dB to 30 dB;
+     * Used RAN: EUTRAN
+     */
+    public static final int SIGNAL_RSSNR = 5;
+
+    /**
+     * 5G SS reference signal received power.
+     * Range: -140 dBm to -44 dBm.
+     * Used RAN: NGRAN
+     * Reference: 3GPP TS 38.215.
+     */
+    public static final int SIGNAL_SSRSRP = 6;
+
+    /**
+     * 5G SS reference signal received quality.
+     * Range: -20 dB to -3 dB.
+     * Used RAN: NGRAN
+     * Reference: 3GPP TS 38.215.
+     */
+    public static final int SIGNAL_SSRSRQ = 7;
+
+    /**
+     * 5G SS signal-to-noise and interference ratio.
+     * Range: -23 dB to 40 dB
+     * Used RAN: NGRAN
+     * Reference: 3GPP TS 38.215 section 5.1.*, 3GPP TS 38.133 section 10.1.16.1.
+     */
+    public static final int SIGNAL_SSSINR = 8;
+
+    /** @hide */
+    @IntDef(prefix = { "SIGNAL_" }, value = {
+        SIGNAL_RSSI,
+        SIGNAL_RSCP,
+        SIGNAL_RSRP,
+        SIGNAL_RSRQ,
+        SIGNAL_RSSNR,
+        SIGNAL_SSRSRP,
+        SIGNAL_SSRSRQ,
+        SIGNAL_SSSINR
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface SignalMeasurementType {}
+
+    @SignalMeasurementType
+    private int mSignalMeasurement;
+
+    /**
+     * A hysteresis time in milliseconds to prevent flapping.
+     * A value of 0 disables hysteresis
+     */
+    private int mHysteresisMs;
+
+    /**
+     * An interval in dB defining the required magnitude change between reports.
+     * hysteresisDb must be smaller than the smallest threshold delta.
+     * An interval value of 0 disables hysteresis.
+     */
+    private int mHysteresisDb;
+
+    /**
+     * List of threshold values.
+     * Range and unit must reference specific SignalMeasurementType
+     * The threshold values for which to apply criteria.
+     * A vector size of 0 disables the use of thresholds for reporting.
+     */
+    private int[] mThresholds = null;
+
+    /**
+     * {@code true} means modem must trigger the report based on the criteria;
+     * {@code false} means modem must not trigger the report based on the criteria.
+     */
+    private boolean mIsEnabled = true;
+
+    /**
+     * Indicates the hysteresisMs is disabled.
+     */
+    public static final int HYSTERESIS_MS_DISABLED = 0;
+
+    /**
+     * Indicates the hysteresisDb is disabled.
+     */
+    public static final int HYSTERESIS_DB_DISABLED = 0;
+
+    /**
+     * Constructor
+     *
+     * @param signalMeasurement Signal Measurement Type
+     * @param hysteresisMs hysteresisMs
+     * @param hysteresisDb hysteresisDb
+     * @param thresholds threshold value
+     * @param isEnabled isEnabled
+     */
+    public SignalThresholdInfo(@SignalMeasurementType int signalMeasurement,
+            int hysteresisMs, int hysteresisDb, @NonNull int [] thresholds, boolean isEnabled) {
+        mSignalMeasurement = signalMeasurement;
+        mHysteresisMs = hysteresisMs < 0 ? HYSTERESIS_MS_DISABLED : hysteresisMs;
+        mHysteresisDb = hysteresisDb < 0 ? HYSTERESIS_DB_DISABLED : hysteresisDb;
+        mThresholds = thresholds == null ? null : thresholds.clone();
+        mIsEnabled = isEnabled;
+    }
+
+    public @SignalMeasurementType int getSignalMeasurement() {
+        return mSignalMeasurement;
+    }
+
+    public int getHysteresisMs() {
+        return mHysteresisMs;
+    }
+
+    public int getHysteresisDb() {
+        return mHysteresisDb;
+    }
+
+    public boolean isEnabled() {
+        return mIsEnabled;
+    }
+
+    public int[] getThresholds() {
+        return mThresholds == null ? null : mThresholds.clone();
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeInt(mSignalMeasurement);
+        out.writeInt(mHysteresisMs);
+        out.writeInt(mHysteresisDb);
+        out.writeIntArray(mThresholds);
+        out.writeBoolean(mIsEnabled);
+    }
+
+    private SignalThresholdInfo(Parcel in) {
+        mSignalMeasurement = in.readInt();
+        mHysteresisMs = in.readInt();
+        mHysteresisDb = in.readInt();
+        mThresholds = in.createIntArray();
+        mIsEnabled = in.readBoolean();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+
+        if (!(o instanceof SignalThresholdInfo)) {
+            return false;
+        }
+
+        SignalThresholdInfo other = (SignalThresholdInfo) o;
+        return mSignalMeasurement == other.mSignalMeasurement
+                && mHysteresisMs == other.mHysteresisMs
+                && mHysteresisDb == other.mHysteresisDb
+                && Arrays.equals(mThresholds, other.mThresholds)
+                && mIsEnabled == other.mIsEnabled;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(
+                mSignalMeasurement, mHysteresisMs, mHysteresisDb, mThresholds, mIsEnabled);
+    }
+
+    public static final @NonNull Parcelable.Creator<SignalThresholdInfo> CREATOR =
+            new Parcelable.Creator<SignalThresholdInfo>() {
+                @Override
+                public SignalThresholdInfo createFromParcel(Parcel in) {
+                    return new SignalThresholdInfo(in);
+                }
+
+                @Override
+                public SignalThresholdInfo[] newArray(int size) {
+                    return new SignalThresholdInfo[size];
+                }
+            };
+
+    @Override
+    public String toString() {
+        return new StringBuilder("SignalThresholdInfo{")
+            .append("mSignalMeasurement=").append(mSignalMeasurement)
+            .append("mHysteresisMs=").append(mSignalMeasurement)
+            .append("mHysteresisDb=").append(mHysteresisDb)
+            .append("mThresholds=").append(Arrays.toString(mThresholds))
+            .append("mIsEnabled=").append(mIsEnabled)
+            .append("}").toString();
+    }
+}