A wireless communication device comprising: a receiver configured to receive a trigger frame for Uplink Orthogonal Frequency Division Multiple Access, UL-OFDMA, random access including a number of terminal information fields, each of the terminal information fields consisting in a resource unit field, set to an identifier of a frequency component, and an assignation field, set to an identifier of the terminal assigned to the frequency component or to a value indicating usage of the frequency component for UL-OFDMA random access controlling circuitry configured to determine a number of the frequency components for the OFDMA random access based on the terminal information fields, and determine whether to respond to the trigger frame based on a backoff count selected randomly from a first value range and the number of the frequency components for the OFDMA random access; and a transmitter configured to randomly select one frequency component from the frequency components for UL-OFDMA random access, if responding to the trigger frame is determined, and transmit a response frame to the trigger frame using the selected frequency component, wherein the controlling circuitry is configured to adjust the first value range based on whether transmission of the response frame has succeeded or failed, said wireless communication device characterised in that the controlling circuitry is configured to determine whether to respond to the trigger frame based on the backoff count and the number of the frequency components for the UL-OFDMA random access if the wireless communication device is not designated by any of the assignation fields in the trigger frame to transmit a response frame on a frequency component as indicated by the corresponding resource unit fields, and the controlling circuitry is configured not to determine whether to respond to the trigger frame based on the backoff count and the number of the frequency components for the UL-OFDMA random access if the wireless communication device is designated by an assignation field in the trigger frame to transmit a response frame on a frequency component as indicated by the corresponding resource unit field, and, in this case the transmitter is configured to transmit the response frame using the frequency component as indicated by the resource unit field corresponding to said assignation field. a receiver configured to receive a trigger frame for Uplink Orthogonal Frequency Division Multiple Access, UL-OFDMA, random access including a number of terminal information fields, each of the terminal information fields consisting in a resource unit field, set to an identifier of a frequency component, and an assignation field, set to an identifier of the terminal assigned to the frequency component or to a value indicating usage of the frequency component for UL-OFDMA random access controlling circuitry configured to determine a number of the frequency components for the OFDMA random access based on the terminal information fields, and determine whether to respond to the trigger frame based on a backoff count selected randomly from a first value range and the number of the frequency components for the OFDMA random access; and a transmitter configured to randomly select one frequency component from the frequency components for UL-OFDMA random access, if responding to the trigger frame is determined, and transmit a response frame to the trigger frame using the selected frequency component, wherein the controlling circuitry is configured to adjust the first value range based on whether transmission of the response frame has succeeded or failed, said wireless communication device characterised in that the controlling circuitry is configured to determine whether to respond to the trigger frame based on the backoff count and the number of the frequency components for the UL-OFDMA random access if the wireless communication device is not designated by any of the assignation fields in the trigger frame to transmit a response frame on a frequency component as indicated by the corresponding resource unit fields, and the controlling circuitry is configured not to determine whether to respond to the trigger frame based on the backoff count and the number of the frequency components for the UL-OFDMA random access if the wireless communication device is designated by an assignation field in the trigger frame to transmit a response frame on a frequency component as indicated by the corresponding resource unit field, and, in this case the transmitter is configured to transmit the response frame using the frequency component as indicated by the resource unit field corresponding to said assignation field.