diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp
index c4d27e8..9b977f2 100644
--- a/src/gprs_bssgp_pcu.cpp
+++ b/src/gprs_bssgp_pcu.cpp
@@ -177,9 +177,8 @@
 
 		/* check for uplink data, so we copy our informations */
 		tbf = tbf_by_tlli(tlli, GPRS_RLCMAC_UL_TBF);
-		if (tbf && tbf->contention_resolution_done
-		 && (tbf->state != GPRS_RLCMAC_FINISHED
-		  || tbf->ul_ack_state != GPRS_RLCMAC_UL_ACK_WAIT_ACK)) {
+		if (tbf && tbf->dir.ul.contention_resolution_done
+		 && !tbf->dir.ul.final_ack_sent) {
 			use_trx = tbf->trx;
 			first_ts = tbf->first_ts;
 			ta = tbf->ta;
diff --git a/src/gprs_rlcmac.h b/src/gprs_rlcmac.h
index 7291f77..fc4173d 100644
--- a/src/gprs_rlcmac.h
+++ b/src/gprs_rlcmac.h
@@ -139,7 +139,6 @@
 	uint8_t tfi;
 	uint32_t tlli;
 	uint8_t tlli_valid;
-	uint8_t contention_resolution_done; /* set after done */
 	uint8_t trx;
 	uint16_t arfcn;
 	uint8_t tsc;
@@ -187,6 +186,8 @@
 			int32_t rx_counter; /* count all received blocks */
 			uint8_t n3103;	/* N3103 counter */
 			uint8_t usf[8];	/* list USFs per PDCH (timeslot) */
+			uint8_t contention_resolution_done; /* set after done */
+			uint8_t final_ack_sent; /* set if we sent final ack */
 		} ul;
 	} dir;
 	uint8_t rlc_block[RLC_MAX_SNS/2][RLC_MAX_LEN]; /* block history */
diff --git a/src/gprs_rlcmac_data.cpp b/src/gprs_rlcmac_data.cpp
index 58985e0..69cfe13 100644
--- a/src/gprs_rlcmac_data.cpp
+++ b/src/gprs_rlcmac_data.cpp
@@ -256,7 +256,7 @@
 			}
 			ul_tbf->tlli = tbf->tlli;
 			ul_tbf->tlli_valid = 1; /* no contention resolution */
-			ul_tbf->contention_resolution_done = 1;
+			ul_tbf->dir.ul.contention_resolution_done = 1;
 			ul_tbf->ta = tbf->ta; /* use current TA */
 			tbf_new_state(ul_tbf, GPRS_RLCMAC_ASSIGN);
 			tbf_timer_start(ul_tbf, 3169, bts->t3169, 0);
@@ -586,13 +586,14 @@
 
 	/* now we must set this flag, so we are allowed to assign downlink
 	 * TBF on PACCH. it is only allowed when TLLI is aknowledged. */
-	tbf->contention_resolution_done = 1;
+	tbf->dir.ul.contention_resolution_done = 1;
 
 	if (final) {
 		tbf->poll_state = GPRS_RLCMAC_POLL_SCHED;
 		tbf->poll_fn = (fn + 13) % 2715648;
 		/* waiting for final acknowledge */
 		tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_WAIT_ACK;
+		tbf->dir.ul.final_ack_sent = 1;
 	} else
 		tbf->ul_ack_state = GPRS_RLCMAC_UL_ACK_NONE;
 
@@ -1432,7 +1433,7 @@
 	if (tbf->direction == GPRS_RLCMAC_UL_TBF) {
 		/* be sure to check first, if contention resolution is done,
 		 * otherwise we cannot send the assignment yet */
-		if (!tbf->contention_resolution_done) {
+		if (!tbf->dir.ul.contention_resolution_done) {
 			LOGP(DRLCMAC, LOGL_DEBUG, "Cannot assign DL TBF now, "
 				"because contention resolution is not "
 				"finished.\n");