diff --git a/drivers/ieee802154/ieee802154_cc1200.c b/drivers/ieee802154/ieee802154_cc1200.c
index 158fe91e683..195a44017d3 100644
--- a/drivers/ieee802154/ieee802154_cc1200.c
+++ b/drivers/ieee802154/ieee802154_cc1200.c
@@ -592,6 +592,7 @@ static int cc1200_set_txpower(struct device *dev, s16_t dbm)
 }
 
 static int cc1200_tx(struct device *dev,
+		     enum ieee802154_tx_mode mode,
 		     struct net_pkt *pkt,
 		     struct net_buf *frag)
 {
@@ -600,6 +601,11 @@ static int cc1200_tx(struct device *dev,
 	u8_t len = frag->len;
 	bool status = false;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	LOG_DBG("%p (%u)", frag, len);
 
 	/* ToDo:
diff --git a/drivers/ieee802154/ieee802154_cc13xx_cc26xx.c b/drivers/ieee802154/ieee802154_cc13xx_cc26xx.c
index 4cff57b2090..e346d72e19f 100644
--- a/drivers/ieee802154/ieee802154_cc13xx_cc26xx.c
+++ b/drivers/ieee802154/ieee802154_cc13xx_cc26xx.c
@@ -188,7 +188,9 @@ static int ieee802154_cc13xx_cc26xx_set_txpower(struct device *dev, s16_t dbm)
 }
 
 /* See IEEE 802.15.4 section 6.2.5.1 and TRM section 25.5.4.3 */
-static int ieee802154_cc13xx_cc26xx_tx(struct device *dev, struct net_pkt *pkt,
+static int ieee802154_cc13xx_cc26xx_tx(struct device *dev,
+				       enum ieee802154_tx_mode mode,
+				       struct net_pkt *pkt,
 				       struct net_buf *frag)
 {
 	struct ieee802154_cc13xx_cc26xx_data *drv_data = get_dev_data(dev);
@@ -196,6 +198,11 @@ static int ieee802154_cc13xx_cc26xx_tx(struct device *dev, struct net_pkt *pkt,
 	int retry = CONFIG_NET_L2_IEEE802154_RADIO_TX_RETRIES;
 	u32_t status;
 
+	if (mode != IEEE802154_TX_MODE_CSMA_CA) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	drv_data->cmd_ieee_csma.status = IDLE;
 	drv_data->cmd_ieee_csma.randomState = sys_rand32_get();
 
diff --git a/drivers/ieee802154/ieee802154_cc2520.c b/drivers/ieee802154/ieee802154_cc2520.c
index d44fa4e8ead..bd4eef0c093 100644
--- a/drivers/ieee802154/ieee802154_cc2520.c
+++ b/drivers/ieee802154/ieee802154_cc2520.c
@@ -793,6 +793,7 @@ error:
 }
 
 static int cc2520_tx(struct device *dev,
+		     enum ieee802154_tx_mode mode,
 		     struct net_pkt *pkt,
 		     struct net_buf *frag)
 {
@@ -802,6 +803,11 @@ static int cc2520_tx(struct device *dev,
 	u8_t retry = 2U;
 	bool status;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	LOG_DBG("%p (%u)", frag, len);
 
 	if (!write_reg_excflag0(cc2520, EXCFLAG0_RESET_TX_FLAGS) ||
diff --git a/drivers/ieee802154/ieee802154_kw41z.c b/drivers/ieee802154/ieee802154_kw41z.c
index 3bcc332a183..6e39fe337cc 100644
--- a/drivers/ieee802154/ieee802154_kw41z.c
+++ b/drivers/ieee802154/ieee802154_kw41z.c
@@ -612,8 +612,8 @@ out:
 	net_pkt_unref(ack_pkt);
 }
 
-static int kw41z_tx(struct device *dev, struct net_pkt *pkt,
-		    struct net_buf *frag)
+static int kw41z_tx(struct device *dev, enum ieee802154_tx_mode mode,
+		    struct net_pkt *pkt, struct net_buf *frag)
 {
 	struct kw41z_context *kw41z = dev->driver_data;
 	u8_t payload_len = frag->len;
@@ -621,6 +621,11 @@ static int kw41z_tx(struct device *dev, struct net_pkt *pkt,
 	u8_t xcvseq;
 	int key;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	/*
 	 * The transmit requests are preceded by the CCA request. On
 	 * completion of the CCA the sequencer should be in the IDLE
diff --git a/drivers/ieee802154/ieee802154_mcr20a.c b/drivers/ieee802154/ieee802154_mcr20a.c
index a56a9de3916..d7e931375b7 100644
--- a/drivers/ieee802154/ieee802154_mcr20a.c
+++ b/drivers/ieee802154/ieee802154_mcr20a.c
@@ -1082,6 +1082,7 @@ static inline bool write_txfifo_content(struct mcr20a_context *dev,
 }
 
 static int mcr20a_tx(struct device *dev,
+		     enum ieee802154_tx_mode mode,
 		     struct net_pkt *pkt,
 		     struct net_buf *frag)
 {
@@ -1090,6 +1091,11 @@ static int mcr20a_tx(struct device *dev,
 						     MCR20A_XCVSEQ_TX;
 	int retval;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	k_mutex_lock(&mcr20a->phy_mutex, K_FOREVER);
 
 	LOG_DBG("%p (%u)", frag, frag->len);
diff --git a/drivers/ieee802154/ieee802154_nrf5.c b/drivers/ieee802154/ieee802154_nrf5.c
index 313dfe8815d..8e3c11f5903 100644
--- a/drivers/ieee802154/ieee802154_nrf5.c
+++ b/drivers/ieee802154/ieee802154_nrf5.c
@@ -322,6 +322,7 @@ free_nrf_ack:
 }
 
 static int nrf5_tx(struct device *dev,
+		   enum ieee802154_tx_mode mode,
 		   struct net_pkt *pkt,
 		   struct net_buf *frag)
 {
@@ -329,6 +330,11 @@ static int nrf5_tx(struct device *dev,
 	u8_t payload_len = frag->len;
 	u8_t *payload = frag->data;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	LOG_DBG("%p (%u)", payload, payload_len);
 
 	nrf5_radio->tx_psdu[0] = payload_len + NRF5_FCS_LENGTH;
diff --git a/drivers/ieee802154/ieee802154_rf2xx.c b/drivers/ieee802154/ieee802154_rf2xx.c
index 9926aecc89f..eeafb6a464b 100644
--- a/drivers/ieee802154/ieee802154_rf2xx.c
+++ b/drivers/ieee802154/ieee802154_rf2xx.c
@@ -473,6 +473,7 @@ static void rf2xx_handle_ack(struct rf2xx_context *ctx, struct net_buf *frag)
 #endif
 
 static int rf2xx_tx(struct device *dev,
+		    enum ieee802154_tx_mode mode,
 		    struct net_pkt *pkt,
 		    struct net_buf *frag)
 {
@@ -481,6 +482,11 @@ static int rf2xx_tx(struct device *dev,
 	struct rf2xx_context *ctx = dev->driver_data;
 	int response = 0;
 
+	if (mode != IEEE802154_TX_MODE_CSMA_CA) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	rf2xx_trx_set_tx_state(dev);
 	rf2xx_iface_reg_read(dev, RF2XX_IRQ_STATUS_REG);
 
diff --git a/drivers/ieee802154/ieee802154_uart_pipe.c b/drivers/ieee802154/ieee802154_uart_pipe.c
index e695fa275cd..14da9e13db8 100644
--- a/drivers/ieee802154/ieee802154_uart_pipe.c
+++ b/drivers/ieee802154/ieee802154_uart_pipe.c
@@ -266,6 +266,7 @@ static int upipe_set_txpower(struct device *dev, s16_t dbm)
 }
 
 static int upipe_tx(struct device *dev,
+		    enum ieee802154_tx_mode mode,
 		    struct net_pkt *pkt,
 		    struct net_buf *frag)
 {
@@ -274,6 +275,11 @@ static int upipe_tx(struct device *dev,
 	u8_t len = frag->len;
 	u8_t i, data;
 
+	if (mode != IEEE802154_TX_MODE_DIRECT) {
+		NET_ERR("TX mode %d not supported", mode);
+		return -ENOTSUP;
+	}
+
 	LOG_DBG("%p (%u)", frag, len);
 
 	if (upipe->stopped) {
diff --git a/include/net/ieee802154_radio.h b/include/net/ieee802154_radio.h
index f01a178390c..1219a14c58a 100644
--- a/include/net/ieee802154_radio.h
+++ b/include/net/ieee802154_radio.h
@@ -36,7 +36,8 @@ enum ieee802154_hw_caps {
 	IEEE802154_HW_2_4_GHZ	  = BIT(4), /* 2.4Ghz radio supported */
 	IEEE802154_HW_TX_RX_ACK	  = BIT(5), /* Handles ACK request on TX */
 	IEEE802154_HW_SUB_GHZ	  = BIT(6), /* Sub-GHz radio supported */
-	IEEE802154_HW_ENERGY_SCAN = BIT(7)  /* Energy scan supported */
+	IEEE802154_HW_ENERGY_SCAN = BIT(7), /* Energy scan supported */
+	IEEE802154_HW_TXTIME	  = BIT(8), /* TX at specified time supported */
 };
 
 enum ieee802154_filter_type {
@@ -57,6 +58,24 @@ struct ieee802154_filter {
 /* @endcond */
 };
 
+/** IEEE802.15.4 Transmission mode. */
+enum ieee802154_tx_mode {
+	/** Transmit packet immediately, no CCA. */
+	IEEE802154_TX_MODE_DIRECT,
+
+	/** Perform CCA before packet transmission. */
+	IEEE802154_TX_MODE_CCA,
+
+	/** Perform full CSMA CA procedure before packet transmission. */
+	IEEE802154_TX_MODE_CSMA_CA,
+
+	/** Transmit packet in the future, at specified time, no CCA. */
+	IEEE802154_TX_MODE_TXTIME,
+
+	/** Transmit packet in the future, perform CCA before transmission. */
+	IEEE802154_TX_MODE_TXTIME_CCA,
+};
+
 /** IEEE802.15.4 driver configuration types. */
 enum ieee802154_config_type {
 	/** Indicates how radio driver should set Frame Pending bit in ACK
@@ -137,9 +156,8 @@ struct ieee802154_radio_api {
 	int (*set_txpower)(struct device *dev, s16_t dbm);
 
 	/** Transmit a packet fragment */
-	int (*tx)(struct device *dev,
-		  struct net_pkt *pkt,
-		  struct net_buf *frag);
+	int (*tx)(struct device *dev, enum ieee802154_tx_mode mode,
+		  struct net_pkt *pkt, struct net_buf *frag);
 
 	/** Start the device */
 	int (*start)(struct device *dev);
diff --git a/samples/net/wpan_serial/src/main.c b/samples/net/wpan_serial/src/main.c
index 0183f8203f1..d21f43e552b 100644
--- a/samples/net/wpan_serial/src/main.c
+++ b/samples/net/wpan_serial/src/main.c
@@ -248,7 +248,8 @@ static void process_data(struct net_pkt *pkt)
 	}
 
 	/* Transmit data through radio */
-	ret = radio_api->tx(ieee802154_dev, pkt, buf);
+	ret = radio_api->tx(ieee802154_dev, IEEE802154_TX_MODE_DIRECT,
+			    pkt, buf);
 	if (ret) {
 		LOG_ERR("Error transmit data");
 	}
diff --git a/samples/net/wpanusb/src/wpanusb.c b/samples/net/wpanusb/src/wpanusb.c
index de8688f172f..342c3d674b1 100644
--- a/samples/net/wpanusb/src/wpanusb.c
+++ b/samples/net/wpanusb/src/wpanusb.c
@@ -260,7 +260,8 @@ static int tx(struct net_pkt *pkt)
 	LOG_DBG("len %d seq %u", buf->len, seq);
 
 	do {
-		ret = radio_api->tx(ieee802154_dev, pkt, buf);
+		ret = radio_api->tx(ieee802154_dev, IEEE802154_TX_MODE_DIRECT,
+				    pkt, buf);
 	} while (ret && retries--);
 
 	if (ret) {
diff --git a/subsys/net/l2/ieee802154/ieee802154.c b/subsys/net/l2/ieee802154/ieee802154.c
index f20bdaf11d3..c6c6f7cb2c5 100644
--- a/subsys/net/l2/ieee802154/ieee802154.c
+++ b/subsys/net/l2/ieee802154/ieee802154.c
@@ -81,7 +81,8 @@ static inline void ieee802154_acknowledge(struct net_if *iface,
 	}
 
 	if (ieee802154_create_ack_frame(iface, pkt, mpdu->mhr.fs->sequence)) {
-		ieee802154_tx(iface, pkt, pkt->buffer);
+		ieee802154_tx(iface, IEEE802154_TX_MODE_DIRECT,
+			      pkt, pkt->buffer);
 	}
 
 	net_pkt_unref(pkt);
@@ -276,7 +277,8 @@ static int ieee802154_send(struct net_if *iface, struct net_pkt *pkt)
 		if (IS_ENABLED(CONFIG_NET_L2_IEEE802154_RADIO_CSMA_CA) &&
 		    ieee802154_get_hw_capabilities(iface) &
 		    IEEE802154_HW_CSMA) {
-			ret = ieee802154_tx(iface, pkt, &frame_buf);
+			ret = ieee802154_tx(iface, IEEE802154_TX_MODE_CSMA_CA,
+					    pkt, &frame_buf);
 		} else {
 			ret = ieee802154_radio_send(iface, pkt, &frame_buf);
 		}
diff --git a/subsys/net/l2/ieee802154/ieee802154_radio_aloha.c b/subsys/net/l2/ieee802154/ieee802154_radio_aloha.c
index 837b9083bd5..c70a3398c1d 100644
--- a/subsys/net/l2/ieee802154/ieee802154_radio_aloha.c
+++ b/subsys/net/l2/ieee802154/ieee802154_radio_aloha.c
@@ -30,7 +30,8 @@ static inline int aloha_radio_send(struct net_if *iface,
 	while (retries) {
 		retries--;
 
-		ret = ieee802154_tx(iface, pkt, frag);
+		ret = ieee802154_tx(iface, IEEE802154_TX_MODE_DIRECT,
+				    pkt, frag);
 		if (ret) {
 			continue;
 		}
diff --git a/subsys/net/l2/ieee802154/ieee802154_radio_csma_ca.c b/subsys/net/l2/ieee802154/ieee802154_radio_csma_ca.c
index ed653e8e865..6afe3638a0d 100644
--- a/subsys/net/l2/ieee802154/ieee802154_radio_csma_ca.c
+++ b/subsys/net/l2/ieee802154/ieee802154_radio_csma_ca.c
@@ -57,7 +57,8 @@ loop:
 			}
 		}
 
-		ret = ieee802154_tx(iface, pkt, frag);
+		ret = ieee802154_tx(iface, IEEE802154_TX_MODE_DIRECT,
+				    pkt, frag);
 		if (ret) {
 			continue;
 		}
diff --git a/subsys/net/l2/ieee802154/ieee802154_utils.h b/subsys/net/l2/ieee802154/ieee802154_utils.h
index bfffe9687ad..e950a9f47f7 100644
--- a/subsys/net/l2/ieee802154/ieee802154_utils.h
+++ b/subsys/net/l2/ieee802154/ieee802154_utils.h
@@ -64,7 +64,9 @@ static inline int ieee802154_set_tx_power(struct net_if *iface, s16_t dbm)
 }
 
 static inline int ieee802154_tx(struct net_if *iface,
-				struct net_pkt *pkt, struct net_buf *buf)
+				enum ieee802154_tx_mode mode,
+				struct net_pkt *pkt,
+				struct net_buf *buf)
 {
 	const struct ieee802154_radio_api *radio =
 		net_if_get_device(iface)->driver_api;
@@ -73,7 +75,7 @@ static inline int ieee802154_tx(struct net_if *iface,
 		return -ENOENT;
 	}
 
-	return radio->tx(net_if_get_device(iface), pkt, buf);
+	return radio->tx(net_if_get_device(iface), mode, pkt, buf);
 }
 
 static inline int ieee802154_start(struct net_if *iface)
diff --git a/subsys/net/lib/openthread/platform/radio.c b/subsys/net/lib/openthread/platform/radio.c
index 6752dbeed00..14d209fa0f5 100644
--- a/subsys/net/lib/openthread/platform/radio.c
+++ b/subsys/net/lib/openthread/platform/radio.c
@@ -190,11 +190,13 @@ void platformRadioProcess(otInstance *aInstance)
 
 		if (sTransmitFrame.mInfo.mTxInfo.mCsmaCaEnabled) {
 			if (radio_api->cca(radio_dev) ||
-			    radio_api->tx(radio_dev, tx_pkt, tx_payload)) {
+			    radio_api->tx(radio_dev, IEEE802154_TX_MODE_DIRECT,
+					  tx_pkt, tx_payload)) {
 				result = OT_ERROR_CHANNEL_ACCESS_FAILURE;
 			}
 		} else {
-			if (radio_api->tx(radio_dev, tx_pkt, tx_payload)) {
+			if (radio_api->tx(radio_dev, IEEE802154_TX_MODE_DIRECT,
+					  tx_pkt, tx_payload)) {
 				result = OT_ERROR_CHANNEL_ACCESS_FAILURE;
 			}
 		}
diff --git a/tests/net/ieee802154/l2/src/ieee802154_fake_driver.c b/tests/net/ieee802154/l2/src/ieee802154_fake_driver.c
index 7307bd02f62..6c9dc47d68f 100644
--- a/tests/net/ieee802154/l2/src/ieee802154_fake_driver.c
+++ b/tests/net/ieee802154/l2/src/ieee802154_fake_driver.c
@@ -60,6 +60,7 @@ static inline void insert_frag(struct net_pkt *pkt, struct net_buf *frag)
 }
 
 static int fake_tx(struct device *dev,
+		   enum ieee802154_tx_mode mode,
 		   struct net_pkt *pkt,
 		   struct net_buf *frag)
 {