One example discloses a method of latency-sensitive traffic transmission for communications between a first WLAN (wireless local area network) device and a second WLAN device, including: scheduling, by the first WLAN device a set of low latency (LL) traffic stream windows with the second WLAN device; having LL traffic for transmission during at least one of the LL traffic stream windows; pre-empting, by the first WLAN device, a TXOP (transmission opportunity) of the second WLAN device if the at least one of the LL traffic stream windows overlaps with the second WLAN device's TXOP; and transmitting, by the first WLAN device, the LL traffic during the TXOP of the second WLAN device that was pre-empted.