diff --git a/fw/htt_ppdu_stats.h b/fw/htt_ppdu_stats.h
index 1ea2c7690c..4dc7487ce5 100644
--- a/fw/htt_ppdu_stats.h
+++ b/fw/htt_ppdu_stats.h
@@ -452,6 +452,42 @@ typedef struct {
                      chan_mhz:     16;
         };
     };
+
+    /*
+     * The cca_delta_time_us reports the time the tx PPDU in question
+     * was waiting in the HW tx queue for the clear channel assessment
+     * to indicate that the transmission could start.
+     * If this CCA delta time is zero or small, this indicates that the
+     * air interface was unused prior to the transmission, and thus it's
+     * improbable that there was a collision with some other transceiver's
+     * transmission.
+     * In contrast, a large CCA delta time means that this transceiver had
+     * to wait a long time for the air interface to be available; it's
+     * possible that other transceivers were also waiting for the air
+     * interface to become available, and if the other waiting transceiver's
+     * CW backoff aligned with this one, to have a transmit collision.
+     */
+    A_UINT32 cca_delta_time_us;
+
+    /*
+     * The rxfrm_delta_time_us reports the time the tx PPDU in question
+     * was waiting in the HW tx queue while there was an ongoing rx,
+     * either because the rx was already ongoing at the time the tx PPDU
+     * was enqueued, or because the rx (i.e. the peer's tx) won the air
+     * interface contention over the local vdev's tx.
+     */
+    A_UINT32 rxfrm_delta_time_us;
+
+    /*
+     * The txfrm_delta_time_us reports the time from when the tx PPDU
+     * in question was enqueued into the HW tx queue until the time the
+     * tx completion interrupt for the PPDU occurred.
+     * Thus, the txfrm_delta_time_us incorporates any time the tx PPDU
+     * had to wait for the air interface to become available, the PPDU
+     * duration, the block ack reception, and the tx completion interrupt
+     * latency.
+     */
+    A_UINT32 txfrm_delta_time_us;
 } htt_ppdu_stats_common_tlv;
 
 #define HTT_PPDU_STATS_USER_COMMON_TLV_TID_NUM_M     0x000000ff