1. A method for an access point of a wireless communication network, the method comprising:the access point alternating between communication using orthogonal frequency division multiple access (OFDMA) and communication using carrier sense multiple access with collision avoidance (CSMA/CA); and
during communication using OFDMA, alternating between uplink communication and downlink communication, wherein
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,
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, and
the time period threshold is smaller than or equal to a minimum time period required for any of a plurality of second wireless communication devices to acquire access to communication with the access point using CSMA/CA,
wherein the access point is configured to use a communication channel resource to communicate with a plurality of first wireless communication devices using OFDMA and to communicate with the plurality of second wireless communication devices using CSMA/CA, wherein the communication channel resource comprises a bandwidth of frequencies dividable into a plurality of sub-carriers for OFDMA.