An access point (AP) uses a communication channel resource to communicate with first wireless communication devices using orthogonal frequency division multiple access (OFDMA) and with second wireless communication devices using carrier sense multiple access with collision avoidance (CSMA/CA). The AP alternates between OFDMA communication and CSMA/CA communication, and—during OFDMA communication—alternating between uplink and downlink communication. Each time period between an end of uplink communication and a start of downlink communication has a duration that is smaller than a time period threshold, and each time period between an end of downlink communication and a start of uplink communication has a duration that is smaller than the time period threshold. The time period threshold is smaller than or equal to a minimum time period required for any of the second wireless communication devices to acquire access to communication with the AP using CSMA/CA.