diff --git a/core/res/res/values/config.xml b/core/res/res/values/config.xml
index 0955b12134224..d48c56c42b097 100644
--- a/core/res/res/values/config.xml
+++ b/core/res/res/values/config.xml
@@ -2596,6 +2596,12 @@
          rmem_min,rmem_def,rmem_max,wmem_min,wmem_def,wmem_max -->
     <string name="config_wifi_tcp_buffers" translatable="false">524288,1048576,2097152,262144,524288,1048576</string>
 
+    <!-- What source to use to estimate link upstream and downstream bandwidth capacities.
+         Default is carrier_config, but it should be set to modem if the modem is returning
+         predictive (instead of instantaneous) bandwidth estimate.
+         Values are carrier_config and modem. -->
+    <string name="config_bandwidthEstimateSource">carrier_config</string>
+
     <!-- Whether WiFi display is supported by this device.
          There are many prerequisites for this feature to work correctly.
          Here are a few of them:
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 41bd73fa2d4c8..076885637f764 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -521,6 +521,7 @@
   <java-symbol type="string" name="config_deviceSpecificDevicePolicyManagerService" />
   <java-symbol type="string" name="config_deviceSpecificAudioService" />
   <java-symbol type="integer" name="config_num_physical_slots" />
+  <java-symbol type="string" name="config_bandwidthEstimateSource" />
 
   <java-symbol type="color" name="tab_indicator_text_v4" />
 
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 8d7d0bb8e0a49..57a47d3d78c5a 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -2461,6 +2461,21 @@ public class CarrierConfigManager {
     public static final String KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT =
             "parameters_use_for_5g_nr_signal_bar_int";
 
+    /**
+     * String array of default bandwidth values per network type.
+     * The entries should be of form "network_name:downstream,upstream", with values in Kbps.
+     * @hide
+     */
+    public static final String KEY_BANDWIDTH_STRING_ARRAY = "bandwidth_string_array";
+
+    /**
+     * For NR (non-standalone), whether to use the LTE value instead of NR value as the default for
+     * upstream bandwidth. Downstream bandwidth will still use the NR value as the default.
+     * @hide
+     */
+    public static final String KEY_BANDWIDTH_NR_NSA_USE_LTE_VALUE_FOR_UPSTREAM_BOOL =
+            "bandwidth_nr_nsa_use_lte_value_for_upstream_bool";
+
     /**
      * Key identifying if voice call barring notification is required to be shown to the user.
      * @hide
@@ -3955,6 +3970,13 @@ public class CarrierConfigManager {
                 });
         sDefaults.putInt(KEY_PARAMETERS_USE_FOR_5G_NR_SIGNAL_BAR_INT,
                 CellSignalStrengthNr.USE_SSRSRP);
+        sDefaults.putStringArray(KEY_BANDWIDTH_STRING_ARRAY, new String[]{
+                "GPRS:24,24", "EDGE:70,18", "UMTS:115,115", "CDMA-IS95A:14,14", "CDMA-IS95B:14,14",
+                "1xRTT:30,30", "EvDo-rev.0:750,48", "EvDo-rev.A:950,550", "HSDPA:4300,620",
+                "HSUPA:4300,1800", "HSPA:4300,1800", "EvDo-rev.B:1500,550:", "eHRPD:750,48",
+                "HSPAP:13000,3400", "TD-SCDMA:115,115", "LTE:30000,15000", "NR_NSA:47000,15000",
+                "NR_NSA_MMWAVE:145000,15000", "NR_SA:145000,15000"});
+        sDefaults.putBoolean(KEY_BANDWIDTH_NR_NSA_USE_LTE_VALUE_FOR_UPSTREAM_BOOL, false);
         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);
diff --git a/telephony/java/com/android/internal/telephony/DctConstants.java b/telephony/java/com/android/internal/telephony/DctConstants.java
index 1449a62fbf35f..f61d4e14f1d3a 100644
--- a/telephony/java/com/android/internal/telephony/DctConstants.java
+++ b/telephony/java/com/android/internal/telephony/DctConstants.java
@@ -114,6 +114,7 @@ public class DctConstants {
     public static final int EVENT_SERVICE_STATE_CHANGED = BASE + 52;
     public static final int EVENT_5G_TIMER_HYSTERESIS = BASE + 53;
     public static final int EVENT_5G_TIMER_WATCHDOG = BASE + 54;
+    public static final int EVENT_UPDATE_CARRIER_CONFIGS = BASE + 55;
 
     /***** Constants *****/
 
@@ -123,4 +124,6 @@ public class DctConstants {
 
     public static final String APN_TYPE_KEY = "apnType";
     public static final String PROVISIONING_URL_KEY = "provisioningUrl";
+    public static final String BANDWIDTH_SOURCE_MODEM_KEY = "modem";
+    public static final String BANDWIDTH_SOURCE_CARRIER_CONFIG_KEY = "carrier_config";
 }