diff --git a/sys/include/net/ieee802154.h b/sys/include/net/ieee802154.h
index 11bc3b1257..3d4fe628fc 100644
--- a/sys/include/net/ieee802154.h
+++ b/sys/include/net/ieee802154.h
@@ -98,6 +98,21 @@ extern "C" {
 #define IEEE802154G_FRAME_LEN_MAX      (2047U)  /**< maximum 802.15.4g-2012 frame length */
 #define IEEE802154_ACK_FRAME_LEN          (5U)  /**< ACK frame length */
 
+/**
+ * @brief Number of symbols to wait during Long Inter Frame Spacing
+ */
+#define IEEE802154_LIFS_SYMS            (40U)
+
+/**
+ * @brief Number of symbols to wait during Short Inter Frame Spacing
+ */
+#define IEEE802154_SIFS_SYMS            (12U)
+
+/**
+ * @brief Maximum frame size to consider a frame as short.
+ */
+#define IEEE802154_SIFS_MAX_FRAME_SIZE  (18U)
+
 /**
  * @brief value of measured power when RSSI is zero.
  *