A wireless communication system in which, based on a random access scheme, the system comprising: a scheduling unit for TXOP granting configured to determine one or more wireless stations having a first parameter lower than a prescribed value as TXOP responders to which a wireless access point grants a first transmission opportunity, TXOP, and to transmit a notification signal representing information on the determination to the wireless access point, wherein the first parameter indicates a quality of the uplink data transmission, t o determine one or more wireless stations having a second parameter lower than the prescribed value as TXOP holders which grant a second TXOP to the wireless access point and to transmit a notification signal representing information on the determination to the wireless access point, wherein the second parameter indicates a quality of the downlink data transmission, wherein the wireless access point includes a unit that is configured t o transmit a TXOP granting signal indicating a timing to perform the uplink data transmission to the TXOP responders after acquiring the information on the determination of the TXOP responders by the notification signal, t o transmit a data frame on the downlink at the indicated timing when receiving the TXOP granting signal, and t o acquire the first TXOP using the random access scheme; and the wireless station includes a unit that is configured to transmit a data frame on the uplink at the indicated timing when receiving the TXOP granting signal, to transmit a TXOP granting signal indicating a timing to perform the downlink data transmission to the wireless access point after recognizing the TXOP holders by the notification signal, and to acquire the second TXOP using the random access scheme. a scheduling unit for TXOP granting configured to determine one or more wireless stations having a first parameter lower than a prescribed value as TXOP responders to which a wireless access point grants a first transmission opportunity, TXOP, and to transmit a notification signal representing information on the determination to the wireless access point, wherein the first parameter indicates a quality of the uplink data transmission, t o determine one or more wireless stations having a second parameter lower than the prescribed value as TXOP holders which grant a second TXOP to the wireless access point and to transmit a notification signal representing information on the determination to the wireless access point, wherein the second parameter indicates a quality of the downlink data transmission, wherein the wireless access point includes a unit that is configured t o transmit a TXOP granting signal indicating a timing to perform the uplink data transmission to the TXOP responders after acquiring the information on the determination of the TXOP responders by the notification signal, t o transmit a data frame on the downlink at the indicated timing when receiving the TXOP granting signal, and t o acquire the first TXOP using the random access scheme; and t o determine one or more wireless stations having a second parameter lower than the prescribed value as TXOP holders which grant a second TXOP to the wireless access point and to transmit a notification signal representing information on the determination to the wireless access point, wherein the second parameter indicates a quality of the downlink data transmission, wherein the wireless access point includes a unit that is configured t o transmit a TXOP granting signal indicating a timing to perform the uplink data transmission to the TXOP responders after acquiring the information on the determination of the TXOP responders by the notification signal, t o transmit a data frame on the downlink at the indicated timing when receiving the TXOP granting signal, and t o acquire the first TXOP using the random access scheme; and the wireless station includes a unit that is configured to transmit a data frame on the uplink at the indicated timing when receiving the TXOP granting signal, to transmit a TXOP granting signal indicating a timing to perform the downlink data transmission to the wireless access point after recognizing the TXOP holders by the notification signal, and to acquire the second TXOP using the random access scheme. to transmit a data frame on the uplink at the indicated timing when receiving the TXOP granting signal, to transmit a TXOP granting signal indicating a timing to perform the downlink data transmission to the wireless access point after recognizing the TXOP holders by the notification signal, and to acquire the second TXOP using the random access scheme.