357 lines
11 KiB
Java
357 lines
11 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.telephony;
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import android.annotation.UnsupportedAppUsage;
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import android.os.Parcel;
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import android.os.Parcelable;
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import java.util.Objects;
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/**
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* LTE signal strength related information.
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*/
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public final class CellSignalStrengthLte extends CellSignalStrength implements Parcelable {
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private static final String LOG_TAG = "CellSignalStrengthLte";
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private static final boolean DBG = false;
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/**
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* Indicates the unknown or undetectable RSSI value in ASU.
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*
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* Reference: TS 27.007 8.5 - Signal quality +CSQ
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*/
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private static final int SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN = 99;
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/**
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* Indicates the maximum valid RSSI value in ASU.
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*
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* Reference: TS 27.007 8.5 - Signal quality +CSQ
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*/
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private static final int SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MAX_VALUE = 31;
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/**
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* Indicates the minimum valid RSSI value in ASU.
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*
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* Reference: TS 27.007 8.5 - Signal quality +CSQ
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*/
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private static final int SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MIN_VALUE = 0;
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@UnsupportedAppUsage
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private int mSignalStrength;
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@UnsupportedAppUsage
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private int mRsrp;
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@UnsupportedAppUsage
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private int mRsrq;
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@UnsupportedAppUsage
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private int mRssnr;
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@UnsupportedAppUsage
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private int mCqi;
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@UnsupportedAppUsage
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private int mTimingAdvance;
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/** @hide */
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@UnsupportedAppUsage
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public CellSignalStrengthLte() {
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setDefaultValues();
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}
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/** @hide */
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public CellSignalStrengthLte(int signalStrength, int rsrp, int rsrq, int rssnr, int cqi,
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int timingAdvance) {
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mSignalStrength = signalStrength;
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mRsrp = rsrp;
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mRsrq = rsrq;
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mRssnr = rssnr;
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mCqi = cqi;
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mTimingAdvance = timingAdvance;
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}
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/** @hide */
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public CellSignalStrengthLte(CellSignalStrengthLte s) {
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copyFrom(s);
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}
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/** @hide */
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protected void copyFrom(CellSignalStrengthLte s) {
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mSignalStrength = s.mSignalStrength;
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mRsrp = s.mRsrp;
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mRsrq = s.mRsrq;
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mRssnr = s.mRssnr;
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mCqi = s.mCqi;
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mTimingAdvance = s.mTimingAdvance;
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}
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/** @hide */
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@Override
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public CellSignalStrengthLte copy() {
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return new CellSignalStrengthLte(this);
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}
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/** @hide */
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@Override
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public void setDefaultValues() {
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mSignalStrength = CellInfo.UNAVAILABLE;
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mRsrp = CellInfo.UNAVAILABLE;
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mRsrq = CellInfo.UNAVAILABLE;
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mRssnr = CellInfo.UNAVAILABLE;
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mCqi = CellInfo.UNAVAILABLE;
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mTimingAdvance = CellInfo.UNAVAILABLE;
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}
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/**
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* Retrieve an abstract level value for the overall signal strength.
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*
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* @return a single integer from 0 to 4 representing the general signal quality.
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* 0 represents very poor signal strength while 4 represents a very strong signal strength.
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*/
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@Override
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public int getLevel() {
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int levelRsrp = 0;
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int levelRssnr = 0;
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if (mRsrp == CellInfo.UNAVAILABLE) levelRsrp = 0;
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else if (mRsrp >= -95) levelRsrp = SIGNAL_STRENGTH_GREAT;
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else if (mRsrp >= -105) levelRsrp = SIGNAL_STRENGTH_GOOD;
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else if (mRsrp >= -115) levelRsrp = SIGNAL_STRENGTH_MODERATE;
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else levelRsrp = SIGNAL_STRENGTH_POOR;
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// See RIL_LTE_SignalStrength in ril.h
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if (mRssnr == CellInfo.UNAVAILABLE) levelRssnr = 0;
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else if (mRssnr >= 45) levelRssnr = SIGNAL_STRENGTH_GREAT;
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else if (mRssnr >= 10) levelRssnr = SIGNAL_STRENGTH_GOOD;
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else if (mRssnr >= -30) levelRssnr = SIGNAL_STRENGTH_MODERATE;
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else levelRssnr = SIGNAL_STRENGTH_POOR;
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int level;
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if (mRsrp == CellInfo.UNAVAILABLE) {
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level = levelRssnr;
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} else if (mRssnr == CellInfo.UNAVAILABLE) {
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level = levelRsrp;
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} else {
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level = (levelRssnr < levelRsrp) ? levelRssnr : levelRsrp;
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}
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if (DBG) log("Lte rsrp level: " + levelRsrp
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+ " snr level: " + levelRssnr + " level: " + level);
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return level;
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}
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/**
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* Get reference signal received quality
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*
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* @return the RSRQ if available or
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* {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable.
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*/
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public int getRsrq() {
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return mRsrq;
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}
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/**
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* Get Received Signal Strength Indication (RSSI) in dBm
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*
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* The value range is [-113, -51] inclusively or {@link CellInfo#UNAVAILABLE} if unavailable.
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*
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* Reference: TS 27.007 8.5 Signal quality +CSQ
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*
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* @return the RSSI if available or {@link CellInfo#UNAVAILABLE} if unavailable.
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*/
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public int getRssi() {
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return convertRssiAsuToDBm(mSignalStrength);
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}
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/**
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* Get reference signal signal-to-noise ratio
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*
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* @return the RSSNR if available or
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* {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable.
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*/
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public int getRssnr() {
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return mRssnr;
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}
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/**
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* Get reference signal received power in dBm
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*
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* @return the RSRP of the measured cell.
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*/
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public int getRsrp() {
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return mRsrp;
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}
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/**
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* Get channel quality indicator
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*
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* @return the CQI if available or
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* {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable.
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*/
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public int getCqi() {
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return mCqi;
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}
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/**
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* Get signal strength in dBm
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*
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* @return the RSRP of the measured cell.
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*/
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@Override
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public int getDbm() {
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return mRsrp;
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}
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/**
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* Get the LTE signal level as an asu value between 0..97, 99 is unknown
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* Asu is calculated based on 3GPP RSRP. Refer to 3GPP 27.007 (Ver 10.3.0) Sec 8.69
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*/
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@Override
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public int getAsuLevel() {
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int lteAsuLevel = 99;
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int lteDbm = getDbm();
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if (lteDbm == CellInfo.UNAVAILABLE) lteAsuLevel = 99;
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else if (lteDbm <= -140) lteAsuLevel = 0;
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else if (lteDbm >= -43) lteAsuLevel = 97;
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else lteAsuLevel = lteDbm + 140;
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if (DBG) log("Lte Asu level: "+lteAsuLevel);
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return lteAsuLevel;
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}
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/**
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* Get the timing advance value for LTE, as a value in range of 0..1282.
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* {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} is reported when there is no
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* active RRC connection. Refer to 3GPP 36.213 Sec 4.2.3
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*
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* @return the LTE timing advance if available or
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* {@link android.telephony.CellInfo#UNAVAILABLE UNAVAILABLE} if unavailable.
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*/
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public int getTimingAdvance() {
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return mTimingAdvance;
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}
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@Override
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public int hashCode() {
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return Objects.hash(mSignalStrength, mRsrp, mRsrq, mRssnr, mCqi, mTimingAdvance);
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}
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@Override
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public boolean equals (Object o) {
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CellSignalStrengthLte s;
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try {
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s = (CellSignalStrengthLte) o;
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} catch (ClassCastException ex) {
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return false;
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}
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if (o == null) {
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return false;
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}
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return mSignalStrength == s.mSignalStrength
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&& mRsrp == s.mRsrp
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&& mRsrq == s.mRsrq
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&& mRssnr == s.mRssnr
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&& mCqi == s.mCqi
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&& mTimingAdvance == s.mTimingAdvance;
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}
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/**
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* @return string representation.
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*/
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@Override
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public String toString() {
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return "CellSignalStrengthLte:"
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+ " ss=" + mSignalStrength
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+ " rsrp=" + mRsrp
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+ " rsrq=" + mRsrq
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+ " rssnr=" + mRssnr
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+ " cqi=" + mCqi
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+ " ta=" + mTimingAdvance;
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}
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/** Implement the Parcelable interface */
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@Override
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public void writeToParcel(Parcel dest, int flags) {
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if (DBG) log("writeToParcel(Parcel, int): " + toString());
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dest.writeInt(mSignalStrength);
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// Need to multiply rsrp and rsrq by -1
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// to ensure consistency when reading values written here
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// unless the values are invalid
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dest.writeInt(mRsrp * (mRsrp != CellInfo.UNAVAILABLE ? -1 : 1));
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dest.writeInt(mRsrq * (mRsrq != CellInfo.UNAVAILABLE ? -1 : 1));
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dest.writeInt(mRssnr);
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dest.writeInt(mCqi);
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dest.writeInt(mTimingAdvance);
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}
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/**
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* Construct a SignalStrength object from the given parcel
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* where the token is already been processed.
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*/
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private CellSignalStrengthLte(Parcel in) {
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mSignalStrength = in.readInt();
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// rsrp and rsrq are written into the parcel as positive values.
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// Need to convert into negative values unless the values are invalid
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mRsrp = in.readInt();
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if (mRsrp != CellInfo.UNAVAILABLE) mRsrp *= -1;
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mRsrq = in.readInt();
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if (mRsrq != CellInfo.UNAVAILABLE) mRsrq *= -1;
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mRssnr = in.readInt();
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mCqi = in.readInt();
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mTimingAdvance = in.readInt();
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if (DBG) log("CellSignalStrengthLte(Parcel): " + toString());
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}
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/** Implement the Parcelable interface */
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@Override
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public int describeContents() {
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return 0;
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}
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/** Implement the Parcelable interface */
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@SuppressWarnings("hiding")
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public static final Parcelable.Creator<CellSignalStrengthLte> CREATOR =
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new Parcelable.Creator<CellSignalStrengthLte>() {
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@Override
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public CellSignalStrengthLte createFromParcel(Parcel in) {
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return new CellSignalStrengthLte(in);
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}
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@Override
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public CellSignalStrengthLte[] newArray(int size) {
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return new CellSignalStrengthLte[size];
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}
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};
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/**
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* log
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*/
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private static void log(String s) {
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Rlog.w(LOG_TAG, s);
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}
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private static int convertRssiAsuToDBm(int rssiAsu) {
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if (rssiAsu != SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN
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&& (rssiAsu < SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MIN_VALUE
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|| rssiAsu > SIGNAL_STRENGTH_LTE_RSSI_VALID_ASU_MAX_VALUE)) {
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Rlog.e(LOG_TAG, "convertRssiAsuToDBm: invalid RSSI in ASU=" + rssiAsu);
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return CellInfo.UNAVAILABLE;
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}
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if (rssiAsu == SIGNAL_STRENGTH_LTE_RSSI_ASU_UNKNOWN) {
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return CellInfo.UNAVAILABLE;
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}
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return -113 + (2 * rssiAsu);
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}
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}
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