diff --git a/src/bts.cpp b/src/bts.cpp
index fe480184..6bc415f5 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -666,7 +666,7 @@ int bts_tfi_find_free(const struct gprs_rlcmac_bts *bts, enum gprs_rlcmac_tbf_di
 	return best_first_tfi;
 }
 
-static int tlli_from_imm_ass(uint32_t *tlli, const uint8_t *data, uint32_t fn)
+static int tlli_from_imm_ass(uint32_t *tlli, const uint8_t *data)
 {
 	const struct gsm48_imm_ass *imm_ass = (struct gsm48_imm_ass *)data;
 	uint8_t plen;
@@ -680,9 +680,9 @@ static int tlli_from_imm_ass(uint32_t *tlli, const uint8_t *data, uint32_t fn)
 	data += 1 + plen;
 
 	if ((*data & 0xf0) != 0xd0) {
-		LOGP(DTBFDL, LOGL_ERROR, "FN=%u Got IMM.ASS confirm, but rest "
+		LOGP(DTBFDL, LOGL_ERROR, "Got IMM.ASS confirm, but rest "
 			"octets do not start with bit sequence 'HH01' "
-			"(Packet Downlink Assignment)\n", fn);
+			"(Packet Downlink Assignment)\n");
 		return -EINVAL;
 	}
 
@@ -696,7 +696,7 @@ static int tlli_from_imm_ass(uint32_t *tlli, const uint8_t *data, uint32_t fn)
 	return 0;
 }
 
-int bts_rcv_imm_ass_cnf(struct gprs_rlcmac_bts *bts, const uint8_t *data, uint32_t tlli, uint32_t fn)
+int bts_rcv_imm_ass_cnf(struct gprs_rlcmac_bts *bts, const uint8_t *data, uint32_t tlli)
 {
 	struct gprs_rlcmac_dl_tbf *dl_tbf;
 	GprsMs *ms;
@@ -710,30 +710,30 @@ int bts_rcv_imm_ass_cnf(struct gprs_rlcmac_bts *bts, const uint8_t *data, uint32
 	/* Extract TLLI from the presented IMMEDIATE ASSIGNMENT
 	 * (if present and only when TLLI that is supplied as function parameter is valid.) */
 	if (data && tlli == GSM_RESERVED_TMSI) {
-		rc = tlli_from_imm_ass(&tlli, data, fn);
+		rc = tlli_from_imm_ass(&tlli, data);
 		if (rc != 0)
 			return -EINVAL;
 	}
 
 	/* Make sure TLLI is valid */
 	if (tlli == GSM_RESERVED_TMSI) {
-		LOGP(DTBFDL, LOGL_ERROR, "FN=%u Got IMM.ASS confirm, but TLLI is invalid!\n", fn);
+		LOGP(DTBFDL, LOGL_ERROR, "Got IMM.ASS confirm, but TLLI is invalid!\n");
 		return -EINVAL;
 	}
 
 	/* Find related TBF and send confirmation signal to FSM */
 	ms = bts_get_ms_by_tlli(bts, tlli, GSM_RESERVED_TMSI);
 	if (!ms) {
-		LOGP(DTBFDL, LOGL_ERROR, "FN=%u Got IMM.ASS confirm for unknown MS with TLLI=%08x\n", fn, tlli);
+		LOGP(DTBFDL, LOGL_ERROR, "Got IMM.ASS confirm for unknown MS with TLLI=%08x\n", tlli);
 		return -EINVAL;
 	}
 	dl_tbf = ms_dl_tbf(ms);
 	if (!dl_tbf) {
-		LOGPMS(ms, DTBFDL, LOGL_ERROR, "FN=%u Got IMM.ASS confirm, but MS has no DL TBF!\n", fn);
+		LOGPMS(ms, DTBFDL, LOGL_ERROR, "Got IMM.ASS confirm, but MS has no DL TBF!\n");
 		return -EINVAL;
 	}
 
-	LOGPTBFDL(dl_tbf, LOGL_DEBUG, "FN=%u Got IMM.ASS confirm\n", fn);
+	LOGPTBFDL(dl_tbf, LOGL_DEBUG, "Got IMM.ASS confirm\n");
 	osmo_fsm_inst_dispatch(dl_tbf->state_fi, TBF_EV_ASSIGN_PCUIF_CNF, NULL);
 
 	return 0;
diff --git a/src/bts.h b/src/bts.h
index 9a18cf36..3fe4503c 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -307,7 +307,7 @@ int bts_tfi_find_free(const struct gprs_rlcmac_bts *bts, enum gprs_rlcmac_tbf_di
 
 int bts_rcv_rach(struct gprs_rlcmac_bts *bts, const struct rach_ind_params *rip);
 int bts_rcv_ptcch_rach(struct gprs_rlcmac_bts *bts, const struct rach_ind_params *rip);
-int bts_rcv_imm_ass_cnf(struct gprs_rlcmac_bts *bts, const uint8_t *data, uint32_t tlli, uint32_t fn);
+int bts_rcv_imm_ass_cnf(struct gprs_rlcmac_bts *bts, const uint8_t *data, uint32_t tlli);
 
 void bts_send_gsmtap(struct gprs_rlcmac_bts *bts,
 		     enum pcu_gsmtap_category categ, bool uplink, uint8_t trx_no,
diff --git a/src/pcu_l1_if.cpp b/src/pcu_l1_if.cpp
index 8597dd4b..a0226473 100644
--- a/src/pcu_l1_if.cpp
+++ b/src/pcu_l1_if.cpp
@@ -534,15 +534,13 @@ static int pcu_rx_data_ind(struct gprs_rlcmac_bts *bts, struct gsm_pcu_if_data *
 static int pcu_rx_data_cnf(struct gprs_rlcmac_bts *bts, struct gsm_pcu_if_data *data_cnf)
 {
 	int rc = 0;
-	int current_fn = bts_current_frame_number(bts);
 
-	LOGP(DL1IF, LOGL_DEBUG, "Data confirm received: sapi=%d fn=%d cur_fn=%d\n",
-		data_cnf->sapi, data_cnf->fn, current_fn);
+	LOGP(DL1IF, LOGL_DEBUG, "Data confirm received: sapi=%d\n", data_cnf->sapi);
 
 	switch (data_cnf->sapi) {
 	case PCU_IF_SAPI_PCH:
 		if (data_cnf->data[2] == GSM48_MT_RR_IMM_ASS)
-			bts_rcv_imm_ass_cnf(bts, data_cnf->data, GSM_RESERVED_TMSI, data_cnf->fn);
+			bts_rcv_imm_ass_cnf(bts, data_cnf->data, GSM_RESERVED_TMSI);
 		break;
 	default:
 		LOGP(DL1IF, LOGL_ERROR, "Received PCU data confirm with "
@@ -556,14 +554,12 @@ static int pcu_rx_data_cnf(struct gprs_rlcmac_bts *bts, struct gsm_pcu_if_data *
 static int pcu_rx_data_cnf_dt(struct gprs_rlcmac_bts *bts, struct gsm_pcu_if_data_cnf_dt *data_cnf_dt)
 {
 	int rc = 0;
-	int current_fn = bts_current_frame_number(bts);
 
-	LOGP(DL1IF, LOGL_DEBUG, "Data confirm received: sapi=%d fn=%d cur_fn=%d\n",
-	     data_cnf_dt->sapi, data_cnf_dt->fn, current_fn);
+	LOGP(DL1IF, LOGL_DEBUG, "Data confirm received: sapi=%d\n", data_cnf_dt->sapi);
 
 	switch (data_cnf_dt->sapi) {
 	case PCU_IF_SAPI_PCH_DT:
-		bts_rcv_imm_ass_cnf(bts, NULL, data_cnf_dt->msg_id, data_cnf_dt->fn);
+		bts_rcv_imm_ass_cnf(bts, NULL, data_cnf_dt->msg_id);
 		break;
 	default:
 		LOGP(DL1IF, LOGL_ERROR, "Received PCU data confirm with unsupported sapi %d\n", data_cnf_dt->sapi);