| /* |
| * Copyright (C) 2018 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 com.android.ons; |
| |
| import android.content.Context; |
| import android.os.Handler; |
| import android.os.HandlerThread; |
| import android.os.Message; |
| import android.os.PersistableBundle; |
| import android.telephony.AccessNetworkConstants; |
| import android.telephony.AvailableNetworkInfo; |
| import android.telephony.CarrierConfigManager; |
| import android.telephony.CellInfo; |
| import android.telephony.CellInfoLte; |
| import android.telephony.NetworkScan; |
| import android.telephony.NetworkScanRequest; |
| import android.telephony.RadioAccessSpecifier; |
| import android.telephony.TelephonyManager; |
| import android.telephony.TelephonyScanManager; |
| import android.util.ArraySet; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.telephony.Rlog; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * Network Scan controller class which will scan for the specific bands as requested and |
| * provide results to caller when ready. |
| */ |
| public class ONSNetworkScanCtlr { |
| private static final String LOG_TAG = "ONSNetworkScanCtlr"; |
| private static final boolean DBG = true; |
| private static final int SEARCH_PERIODICITY_SLOW = (int) TimeUnit.MINUTES.toSeconds(5); |
| private static final int SEARCH_PERIODICITY_FAST = (int) TimeUnit.MINUTES.toSeconds(1); |
| private static final int MAX_SEARCH_TIME = (int) TimeUnit.MINUTES.toSeconds(1); |
| private static final int SCAN_RESTART_TIME = (int) TimeUnit.MINUTES.toMillis(1); |
| private final Object mLock = new Object(); |
| |
| /* message to handle scan responses from modem */ |
| private static final int MSG_SCAN_RESULTS_AVAILABLE = 1; |
| private static final int MSG_SCAN_COMPLETE = 2; |
| private static final int MSG_SCAN_ERROR = 3; |
| |
| /* scan object to keep track of current scan request */ |
| private NetworkScan mCurrentScan; |
| private boolean mIsScanActive; |
| private NetworkScanRequest mCurrentScanRequest; |
| private List<String> mMccMncs; |
| private TelephonyManager mTelephonyManager; |
| private CarrierConfigManager configManager; |
| private int mRsrpEntryThreshold; |
| @VisibleForTesting |
| protected NetworkAvailableCallBack mNetworkAvailableCallBack; |
| HandlerThread mThread; |
| private Handler mHandler; |
| |
| @VisibleForTesting |
| public TelephonyScanManager.NetworkScanCallback mNetworkScanCallback = |
| new TelephonyScanManager.NetworkScanCallback() { |
| |
| @Override |
| public void onResults(List<CellInfo> results) { |
| logDebug("Total results :" + results.size()); |
| for (CellInfo cellInfo : results) { |
| logDebug("cell info: " + cellInfo); |
| } |
| |
| Message message = Message.obtain(mHandler, MSG_SCAN_RESULTS_AVAILABLE, results); |
| message.sendToTarget(); |
| } |
| |
| @Override |
| public void onComplete() { |
| logDebug("Scan completed!"); |
| Message message = Message.obtain(mHandler, MSG_SCAN_COMPLETE, NetworkScan.SUCCESS); |
| mHandler.sendMessageDelayed(message, SCAN_RESTART_TIME); |
| } |
| |
| @Override |
| public void onError(@NetworkScan.ScanErrorCode int error) { |
| logDebug("Scan error " + error); |
| Message message = Message.obtain(mHandler, MSG_SCAN_ERROR, error); |
| message.sendToTarget(); |
| } |
| }; |
| |
| /** |
| * call back for network availability |
| */ |
| public interface NetworkAvailableCallBack { |
| |
| /** |
| * Returns the scan results to the user, this callback will be called multiple times. |
| */ |
| void onNetworkAvailability(List<CellInfo> results); |
| |
| /** |
| * on error |
| * @param error |
| */ |
| void onError(int error); |
| } |
| |
| private int getIntCarrierConfig(String key) { |
| PersistableBundle b = null; |
| if (configManager != null) { |
| // If an invalid subId is used, this bundle will contain default values. |
| b = configManager.getConfig(); |
| } |
| if (b != null) { |
| return b.getInt(key); |
| } else { |
| // Return static default defined in CarrierConfigManager. |
| return CarrierConfigManager.getDefaultConfig().getInt(key); |
| } |
| } |
| |
| /** |
| * analyze scan results |
| * @param results contains all available cells matching the scan request at current location. |
| */ |
| public void analyzeScanResults(List<CellInfo> results) { |
| /* Inform registrants about availability of network */ |
| if (!mIsScanActive || results == null) { |
| return; |
| } |
| List<CellInfo> filteredResults = new ArrayList<CellInfo>(); |
| synchronized (mLock) { |
| for (CellInfo cellInfo : results) { |
| if (mMccMncs.contains(getMccMnc(cellInfo))) { |
| if (cellInfo instanceof CellInfoLte) { |
| int rsrp = ((CellInfoLte) cellInfo).getCellSignalStrength().getRsrp(); |
| logDebug("cell info rsrp: " + rsrp); |
| if (rsrp >= mRsrpEntryThreshold) { |
| filteredResults.add(cellInfo); |
| } |
| } |
| } |
| } |
| } |
| if ((filteredResults.size() >= 1) && (mNetworkAvailableCallBack != null)) { |
| /* Todo: change to aggregate results on success. */ |
| mNetworkAvailableCallBack.onNetworkAvailability(filteredResults); |
| } |
| } |
| |
| private void invalidateScanOnError(int error) { |
| logDebug("scan invalidated on error"); |
| if (mNetworkAvailableCallBack != null) { |
| mNetworkAvailableCallBack.onError(error); |
| } |
| |
| synchronized (mLock) { |
| mIsScanActive = false; |
| mCurrentScan = null; |
| } |
| } |
| |
| public ONSNetworkScanCtlr(Context c, TelephonyManager telephonyManager, |
| NetworkAvailableCallBack networkAvailableCallBack) { |
| init(c, telephonyManager, networkAvailableCallBack); |
| } |
| |
| /** |
| * initialize Network Scan controller |
| * @param c context |
| * @param telephonyManager Telephony manager instance |
| * @param networkAvailableCallBack callback to be called when network selection is done |
| */ |
| public void init(Context context, TelephonyManager telephonyManager, |
| NetworkAvailableCallBack networkAvailableCallBack) { |
| log("init called"); |
| mThread = new HandlerThread(LOG_TAG); |
| mThread.start(); |
| mHandler = new Handler(mThread.getLooper()) { |
| @Override |
| public void handleMessage(Message msg) { |
| switch (msg.what) { |
| case MSG_SCAN_RESULTS_AVAILABLE: |
| logDebug("Msg received for scan results"); |
| /* Todo: need to aggregate the results */ |
| analyzeScanResults((List<CellInfo>) msg.obj); |
| break; |
| case MSG_SCAN_COMPLETE: |
| logDebug("Msg received for scan complete"); |
| restartScan(); |
| break; |
| case MSG_SCAN_ERROR: |
| logDebug("Msg received for scan error"); |
| invalidateScanOnError((int) msg.obj); |
| break; |
| default: |
| log("invalid message"); |
| break; |
| } |
| } |
| }; |
| mTelephonyManager = telephonyManager; |
| mNetworkAvailableCallBack = networkAvailableCallBack; |
| configManager = (CarrierConfigManager) context.getSystemService( |
| Context.CARRIER_CONFIG_SERVICE); |
| } |
| |
| /* get mcc mnc from cell info if the cell is for LTE */ |
| private String getMccMnc(CellInfo cellInfo) { |
| if (cellInfo instanceof CellInfoLte) { |
| return ((CellInfoLte) cellInfo).getCellIdentity().getMccString() |
| + ((CellInfoLte) cellInfo).getCellIdentity().getMncString(); |
| } |
| |
| return null; |
| } |
| |
| private NetworkScanRequest createNetworkScanRequest(ArrayList<AvailableNetworkInfo> availableNetworks, |
| int periodicity) { |
| RadioAccessSpecifier[] ras = new RadioAccessSpecifier[1]; |
| ArrayList<String> mccMncs = new ArrayList<String>(); |
| Set<Integer> bandSet = new ArraySet<>(); |
| |
| /* by default add band 48 */ |
| bandSet.add(AccessNetworkConstants.EutranBand.BAND_48); |
| /* retrieve mcc mncs and bands for available networks */ |
| for (AvailableNetworkInfo availableNetwork : availableNetworks) { |
| mccMncs.addAll(availableNetwork.getMccMncs()); |
| bandSet.addAll(availableNetwork.getBands()); |
| } |
| |
| int[] bands = bandSet.stream().mapToInt(band->band).toArray(); |
| /* create network scan request */ |
| ras[0] = new RadioAccessSpecifier(AccessNetworkConstants.AccessNetworkType.EUTRAN, bands, |
| null); |
| NetworkScanRequest networkScanRequest = new NetworkScanRequest( |
| NetworkScanRequest.SCAN_TYPE_PERIODIC, ras, periodicity, MAX_SEARCH_TIME, false, |
| NetworkScanRequest.MAX_INCREMENTAL_PERIODICITY_SEC, mccMncs); |
| synchronized (mLock) { |
| mMccMncs = mccMncs; |
| } |
| return networkScanRequest; |
| } |
| |
| /** |
| * start less interval network scan |
| * @param availableNetworks list of subscriptions for which the scanning needs to be started. |
| * @return true if successfully accepted request. |
| */ |
| public boolean startFastNetworkScan(ArrayList<AvailableNetworkInfo> availableNetworks) { |
| NetworkScanRequest networkScanRequest = createNetworkScanRequest(availableNetworks, |
| SEARCH_PERIODICITY_FAST); |
| return startNetworkScan(networkScanRequest); |
| } |
| |
| |
| private boolean startNetworkScan(NetworkScanRequest networkScanRequest) { |
| NetworkScan networkScan; |
| synchronized (mLock) { |
| /* if the request is same as existing one, then make sure to not proceed */ |
| if (mIsScanActive && mCurrentScanRequest.equals(networkScanRequest)) { |
| return true; |
| } |
| |
| /* Need to stop current scan if we already have one */ |
| stopNetworkScan(); |
| |
| /* user lower threshold to enable modem stack */ |
| mRsrpEntryThreshold = |
| getIntCarrierConfig( |
| CarrierConfigManager.KEY_OPPORTUNISTIC_NETWORK_EXIT_THRESHOLD_RSRP_INT); |
| |
| /* start new scan */ |
| networkScan = mTelephonyManager.requestNetworkScan(networkScanRequest, |
| mNetworkScanCallback); |
| |
| mCurrentScan = networkScan; |
| mIsScanActive = true; |
| mCurrentScanRequest = networkScanRequest; |
| } |
| |
| logDebug("startNetworkScan " + networkScanRequest); |
| return true; |
| } |
| |
| private void restartScan() { |
| NetworkScan networkScan; |
| logDebug("restartScan"); |
| synchronized (mLock) { |
| if (mCurrentScanRequest != null) { |
| networkScan = mTelephonyManager.requestNetworkScan(mCurrentScanRequest, |
| mNetworkScanCallback); |
| mIsScanActive = true; |
| } |
| } |
| } |
| |
| /** |
| * stop network scan |
| */ |
| public void stopNetworkScan() { |
| logDebug("stopNetworkScan"); |
| synchronized (mLock) { |
| if (mIsScanActive && mCurrentScan != null) { |
| try { |
| mCurrentScan.stopScan(); |
| } catch (IllegalArgumentException iae) { |
| logDebug("Scan failed with exception " + iae); |
| } |
| mIsScanActive = false; |
| mCurrentScan = null; |
| mCurrentScanRequest = null; |
| } |
| } |
| } |
| |
| private static void log(String msg) { |
| Rlog.d(LOG_TAG, msg); |
| } |
| |
| private static void logDebug(String msg) { |
| if (DBG) { |
| Rlog.d(LOG_TAG, msg); |
| } |
| } |
| } |