diff --git a/include/osmo-bts/scheduler.h b/include/osmo-bts/scheduler.h
index b488b6c44..f19a13ed2 100644
--- a/include/osmo-bts/scheduler.h
+++ b/include/osmo-bts/scheduler.h
@@ -276,6 +276,12 @@ enum sched_meas_avg_mode {
 	SCHED_MEAS_AVG_M_OCTO,
 	/* last 6 bursts (default for FACCH/H) */
 	SCHED_MEAS_AVG_M_SIX,
+	/* first 4 of last 8 bursts */
+	SCHED_MEAS_AVG_M8_FIRST_QUAD,
+	/* first 2 of last 6 bursts */
+	SCHED_MEAS_AVG_M6_FIRST_TWO,
+	/* middle 2 of last 6 bursts */
+	SCHED_MEAS_AVG_M6_MIDDLE_TWO,
 };
 
 void trx_sched_meas_push(struct l1sched_chan_state *chan_state,
diff --git a/src/osmo-bts-trx/sched_lchan_tchf.c b/src/osmo-bts-trx/sched_lchan_tchf.c
index e29a47e23..9c5bfc22d 100644
--- a/src/osmo-bts-trx/sched_lchan_tchf.c
+++ b/src/osmo-bts-trx/sched_lchan_tchf.c
@@ -173,6 +173,17 @@ int rx_tchf_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 			break;
 		}
 
+		switch (chan_state->amr_last_dtx) {
+		case AFS_SID_FIRST:
+		case AFS_SID_UPDATE_CN:
+			meas_avg_mode = SCHED_MEAS_AVG_M8_FIRST_QUAD;
+			break;
+		case AFS_SID_UPDATE:
+		case AFS_ONSET:
+			meas_avg_mode = SCHED_MEAS_AVG_M_QUAD;
+			break;
+		}
+
 		if (rc)
 			trx_loop_amr_input(l1t,
 				trx_chan_desc[chan].chan_nr | bi->tn, chan_state,
diff --git a/src/osmo-bts-trx/sched_lchan_tchh.c b/src/osmo-bts-trx/sched_lchan_tchh.c
index 2a561e1ed..c400542ad 100644
--- a/src/osmo-bts-trx/sched_lchan_tchh.c
+++ b/src/osmo-bts-trx/sched_lchan_tchh.c
@@ -184,6 +184,20 @@ int rx_tchh_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
 			break;
 		}
 
+		switch (chan_state->amr_last_dtx) {
+		case AHS_SID_FIRST_P1:
+		case AHS_SID_FIRST_P2:
+		case AHS_SID_UPDATE:
+		case AHS_SID_UPDATE_CN:
+		case AHS_SID_FIRST_INH:
+		case AHS_SID_UPDATE_INH:
+			meas_avg_mode = SCHED_MEAS_AVG_M6_FIRST_TWO;
+			break;
+		case AHS_ONSET:
+			meas_avg_mode = SCHED_MEAS_AVG_M6_MIDDLE_TWO;
+			break;
+		}
+
 		if (rc)
 			trx_loop_amr_input(l1t,
 				trx_chan_desc[chan].chan_nr | bi->tn, chan_state,
diff --git a/src/osmo-bts-trx/scheduler_trx.c b/src/osmo-bts-trx/scheduler_trx.c
index 3921280b8..c00032444 100644
--- a/src/osmo-bts-trx/scheduler_trx.c
+++ b/src/osmo-bts-trx/scheduler_trx.c
@@ -517,6 +517,18 @@ void trx_sched_meas_avg(const struct l1sched_chan_state *chan_state,
 	case SCHED_MEAS_AVG_M_SIX:
 		n = 6; shift = n;
 		break;
+	/* first 4 of last 8 bursts */
+	case SCHED_MEAS_AVG_M8_FIRST_QUAD:
+		n = 4; shift = 8;
+		break;
+	/* first 2 of last 6 bursts */
+	case SCHED_MEAS_AVG_M6_FIRST_TWO:
+		n = 2; shift = 6;
+		break;
+	/* middle 2 of last 6 bursts */
+	case SCHED_MEAS_AVG_M6_MIDDLE_TWO:
+		n = 2; shift = 4;
+		break;
 	default:
 		/* Shall not happen */
 		OSMO_ASSERT(false);