A method for processing a first Physical layer Protocol Data Unit, PPDU, by a station, STA, in a wireless local area network, the method comprising: determining whether the first PPDU is transmitted from a different Basic Service Set, BSS, from a BSS to which the STA belongs or a same BSS as the BSS to which the STA belongs based on BSS identification information included in the first PPDU; and processing the first PPDU, wherein processing the first PPDU comprises: processing the first PPDU using a first type of Clear Channel Assessment, CCA, threshold when the first PPDU is determined to be transmitted from the different BSS; and processing the first PPDU using a second type of CCA threshold when the first PPDU is determined to be transmitted from the same BSS, wherein a value of the first type of CCA threshold is greater than a value of the second type of CCA threshold, wherein the BSS identification information included in the first PPDU is included in a High Efficiency-Signal-A, HE-SIG-A, field or a Medium Access Control, MAC, header included in the first PPDU, wherein processing the first PPDU further comprises: determining whether to reset a Network Allocation Vector, NAV, when the first PPDU includes a Contention Free-END, CF-END, frame based on whether the first PPDU is transmitted from the different BSS or the same BSS, including determining to reset the NAV when the first PPDU is transmitted from the same BSS and determining to not reset the NAV when the first PPDU is transmitted from the different BSS. determining whether the first PPDU is transmitted from a different Basic Service Set, BSS, from a BSS to which the STA belongs or a same BSS as the BSS to which the STA belongs based on BSS identification information included in the first PPDU; and processing the first PPDU, wherein processing the first PPDU comprises: processing the first PPDU using a first type of Clear Channel Assessment, CCA, threshold when the first PPDU is determined to be transmitted from the different BSS; and processing the first PPDU using a second type of CCA threshold when the first PPDU is determined to be transmitted from the same BSS, processing the first PPDU using a first type of Clear Channel Assessment, CCA, threshold when the first PPDU is determined to be transmitted from the different BSS; and processing the first PPDU using a second type of CCA threshold when the first PPDU is determined to be transmitted from the same BSS, wherein a value of the first type of CCA threshold is greater than a value of the second type of CCA threshold, wherein the BSS identification information included in the first PPDU is included in a High Efficiency-Signal-A, HE-SIG-A, field or a Medium Access Control, MAC, header included in the first PPDU, wherein processing the first PPDU further comprises: determining whether to reset a Network Allocation Vector, NAV, when the first PPDU includes a Contention Free-END, CF-END, frame based on whether the first PPDU is transmitted from the different BSS or the same BSS, including determining to reset the NAV when the first PPDU is transmitted from the same BSS and determining to not reset the NAV when the first PPDU is transmitted from the different BSS.