A method of managing channel allocation for asynchronous data transmission includes (a) broadcasting a first superframe for a first beacon period, the first superframe containing a control section and a data slot section; (b) receiving a request frame from at least one wireless device belonging to a network via the control section, the request frame requesting addition of a data slot for asynchronous data transmission; (c) transmitting a response frame to the at least one wireless device via the control section in response to the request frame; and (d) broadcasting a second superframe for a second beacon period, the second superframe containing information regarding a data slot added to the at least one wireless device.