diff --git a/gnss/2.1/IGnssMeasurementCallback.hal b/gnss/2.1/IGnssMeasurementCallback.hal
index 0e6abbd..60a5423 100644
--- a/gnss/2.1/IGnssMeasurementCallback.hal
+++ b/gnss/2.1/IGnssMeasurementCallback.hal
@@ -30,13 +30,13 @@
      */
     enum GnssMeasurementFlags : @1.0::IGnssMeasurementCallback.GnssMeasurementFlags {
         /**
-         * A valid receiver inter-signal bias is stored in the data structure.
+         * A valid full inter-signal bias is stored in the data structure.
          */
-        HAS_RECEIVER_ISB = 1 << 16,
+        HAS_FULL_ISB = 1 << 16,
         /**
-         * A valid receiver inter-signal bias uncertainty is stored in the data structure.
+         * A valid full inter-signal bias uncertainty is stored in the data structure.
          */
-        HAS_RECEIVER_ISB_UNCERTAINTY = 1 << 17,
+        HAS_FULL_ISB_UNCERTAINTY = 1 << 17,
         /**
          * A valid satellite inter-signal bias is stored in the data structure.
          */
@@ -77,42 +77,58 @@
         bitfield<GnssMeasurementFlags> flags;
 
         /**
-         * The receiver inter-signal bias (ISB) in nanoseconds.
+         * The full inter-signal bias (ISB) in nanoseconds.
          *
-         * This value is the estimated receiver-side inter-system (different from the constellation
-         * in GnssClock.referenceSignalTypeForIsb) bias and inter-frequency (different from the
-         * carrier frequency in GnssClock.referenceSignalTypeForIsb) bias. The reported receiver ISB
-         * must include signal delays caused by
+         * This value is the sum of the estimated receiver-side and the space-segment-side
+         * inter-system bias, inter-frequency bias and inter-code bias, including
          *
-         * - Receiver inter-constellation bias
-         * - Receiver inter-frequency bias
-         * - Receiver inter-code bias
+         * - Receiver inter-constellation bias (with respect to the constellation in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Receiver inter-frequency bias (with respect to the carrier frequency in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Receiver inter-code bias (with respect to the code type in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Master clock bias (e.g., GPS-GAL Time Offset (GGTO), GPS-UTC Time Offset
+         *   (TauGps), BDS-GLO Time Offset (BGTO)) (with respect to the constellation in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Group delay (e.g., Total Group Delay (TGD))
+         * - Satellite inter-frequency bias (GLO only) (with respect to the carrier frequency in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Satellite inter-code bias (e.g., Differential Code Bias (DCB)) (with respect to the
+         *   code type in GnssClock.referenceSignalTypeForIsb)
+         *
+         * If a component of the above is already compensated in the provided
+         * GnssMeasurement.receivedSvTimeInNs, then it must not be included in the reported full
+         * ISB.
          *
          * The value does not include the inter-frequency Ionospheric bias.
          *
-         * The receiver ISB of GnssClock.referenceSignalTypeForIsb is defined to be 0.0 nanoseconds.
+         * The full ISB of GnssClock.referenceSignalTypeForIsb is defined to be 0.0 nanoseconds.
          */
-        double receiverInterSignalBiasNs;
+        double fullInterSignalBiasNs;
 
         /**
-         * 1-sigma uncertainty associated with the receiver inter-signal bias in nanoseconds.
+         * 1-sigma uncertainty associated with the full inter-signal bias in nanoseconds.
          */
-        double receiverInterSignalBiasUncertaintyNs;
+        double fullInterSignalBiasUncertaintyNs;
 
         /**
          * The satellite inter-signal bias in nanoseconds.
          *
-         * This value is the satellite-and-control-segment-side inter-system (different from the
-         * constellation in GnssClock.referenceSignalTypeForIsb) bias and inter-frequency (different
-         * from the carrier frequency in GnssClock.referenceSignalTypeForIsb) bias, including:
+         * This value is the sum of the space-segment-side inter-system bias, inter-frequency bias
+         * and inter-code bias, including
          *
-         * - Master clock bias (e.g., GPS-GAL Time Offset (GGTO), GPT-UTC Time Offset (TauGps),
-         *   BDS-GLO Time Offset (BGTO))
+         * - Master clock bias (e.g., GPS-GAL Time Offset (GGTO), GPS-UTC Time Offset
+         *   (TauGps), BDS-GLO Time Offset (BGTO)) (with respect to the constellation in
+         *   GnssClock.referenceSignalTypeForIsb)
          * - Group delay (e.g., Total Group Delay (TGD))
-         * - Satellite inter-signal bias, which includes satellite inter-frequency bias (GLO only),
-         *   and satellite inter-code bias (e.g., Differential Code Bias (DCB)).
+         * - Satellite inter-frequency bias (GLO only) (with respect to the carrier frequency in
+         *   GnssClock.referenceSignalTypeForIsb)
+         * - Satellite inter-code bias (e.g., Differential Code Bias (DCB)) (with respect to the
+         *   code type in GnssClock.referenceSignalTypeForIsb)
          *
-         * The receiver ISB of GnssClock.referenceSignalTypeForIsb is defined to be 0.0 nanoseconds.
+         * The satellite ISB of GnssClock.referenceSignalTypeForIsb is defined to be 0.0
+         * nanoseconds.
          */
         double satelliteInterSignalBiasNs;
 
diff --git a/gnss/2.1/vts/functional/gnss_hal_test_cases.cpp b/gnss/2.1/vts/functional/gnss_hal_test_cases.cpp
index 7b054c0..33feb5e 100644
--- a/gnss/2.1/vts/functional/gnss_hal_test_cases.cpp
+++ b/gnss/2.1/vts/functional/gnss_hal_test_cases.cpp
@@ -98,7 +98,7 @@
  * TestGnssMeasurementFields:
  * Sets a GnssMeasurementCallback, waits for a measurement, and verifies
  * 1. basebandCN0DbHz is valid
- * 2. ISB fields are valid if HAS_INTER_SIGNAL_BIAS is true.
+ * 2. ISB fields are valid
  */
 TEST_P(GnssHalTest, TestGnssMeasurementFields) {
     const int kFirstGnssMeasurementTimeoutSeconds = 10;
@@ -126,9 +126,8 @@
         // Verify basebandCn0DbHz is valid.
         ASSERT_TRUE(measurement.basebandCN0DbHz > 0.0 && measurement.basebandCN0DbHz <= 65.0);
 
-        if (((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_RECEIVER_ISB) > 0) &&
-            ((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_RECEIVER_ISB_UNCERTAINTY) >
-             0) &&
+        if (((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_FULL_ISB) > 0) &&
+            ((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_FULL_ISB_UNCERTAINTY) > 0) &&
             ((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_SATELLITE_ISB) > 0) &&
             ((uint32_t)(measurement.flags & GnssMeasurementFlags::HAS_SATELLITE_ISB_UNCERTAINTY) >
              0)) {
@@ -143,8 +142,8 @@
             ASSERT_TRUE(carrierFrequencyHz > 0);
             ASSERT_TRUE(codeType != "");
 
-            ASSERT_TRUE(std::abs(measurement.receiverInterSignalBiasNs) < 1.0e6);
-            ASSERT_TRUE(measurement.receiverInterSignalBiasUncertaintyNs >= 0);
+            ASSERT_TRUE(std::abs(measurement.fullInterSignalBiasNs) < 1.0e6);
+            ASSERT_TRUE(measurement.fullInterSignalBiasUncertaintyNs >= 0);
             ASSERT_TRUE(std::abs(measurement.satelliteInterSignalBiasNs) < 1.0e6);
             ASSERT_TRUE(measurement.satelliteInterSignalBiasUncertaintyNs >= 0);
         }
diff --git a/gnss/common/utils/default/Utils.cpp b/gnss/common/utils/default/Utils.cpp
index 2e5b873..386090e 100644
--- a/gnss/common/utils/default/Utils.cpp
+++ b/gnss/common/utils/default/Utils.cpp
@@ -39,12 +39,12 @@
             .v2_0 = gnssDataV2_0.measurements[0],
             .flags = (uint32_t)(GnssMeasurementFlagsV2_1::HAS_CARRIER_FREQUENCY |
                                 GnssMeasurementFlagsV2_1::HAS_CARRIER_PHASE |
-                                GnssMeasurementFlagsV2_1::HAS_RECEIVER_ISB |
-                                GnssMeasurementFlagsV2_1::HAS_RECEIVER_ISB_UNCERTAINTY |
+                                GnssMeasurementFlagsV2_1::HAS_FULL_ISB |
+                                GnssMeasurementFlagsV2_1::HAS_FULL_ISB_UNCERTAINTY |
                                 GnssMeasurementFlagsV2_1::HAS_SATELLITE_ISB |
                                 GnssMeasurementFlagsV2_1::HAS_SATELLITE_ISB_UNCERTAINTY),
-            .receiverInterSignalBiasNs = 10.0,
-            .receiverInterSignalBiasUncertaintyNs = 100.0,
+            .fullInterSignalBiasNs = 30.0,
+            .fullInterSignalBiasUncertaintyNs = 250.0,
             .satelliteInterSignalBiasNs = 20.0,
             .satelliteInterSignalBiasUncertaintyNs = 150.0,
             .basebandCN0DbHz = 25.0,