A method of controlling radio transmission in a wireless communication network, the method comprising: an access node (100; 800; 1200) of the wireless communication network controlling radio transmissions on a set of radio resources; the access node (100; 800; 1200) determining a group of multiple radio devices (11, 12, 13; 1100; 1300); and by sending a grant addressed to the radio devices (11, 12, 13; 1100; 1300) of the group, the access node (100; 800; 1200) granting an uplink transmission attempt on the set of radio resources to each radio device (11, 12, 13; 1100; 1300) of the group, wherein the uplink transmission attempt is based on a listen-before-talk procedure comprising that the radio device performs measurements to detect whether the set of radio resources is available and that, in response to detecting that the set of radio resources is available, the radio device (11, 12, 13; 1100; 1300) performs a radio transmission to the access node (100; 800; 1200) on the set of radio resources, wherein the listen-before talk procedure further comprises that: over a backoff time, the radio device (11, 12, 13; 1100; 1300) performs measurements on the set of radio resources, on the basis of the measurements, the radio device (11, 12, 13; 1100; 1300) detects that the set of radio resources is available, and upon expiry of the backoff time, the radio device (11, 12, 13; 1100; 1300) performs the radio transmission, and wherein the grant comprises configuration information indicating, for each of the radio devices (11, 12, 13; 1100; 1300) of the group, a different individual duration of the backoff time to be applied by the radio device (11, 12, 13, 1100; 1300). an access node (100; 800; 1200) of the wireless communication network controlling radio transmissions on a set of radio resources; the access node (100; 800; 1200) determining a group of multiple radio devices (11, 12, 13; 1100; 1300); and by sending a grant addressed to the radio devices (11, 12, 13; 1100; 1300) of the group, the access node (100; 800; 1200) granting an uplink transmission attempt on the set of radio resources to each radio device (11, 12, 13; 1100; 1300) of the group, wherein the uplink transmission attempt is based on a listen-before-talk procedure comprising that the radio device performs measurements to detect whether the set of radio resources is available and that, in response to detecting that the set of radio resources is available, the radio device (11, 12, 13; 1100; 1300) performs a radio transmission to the access node (100; 800; 1200) on the set of radio resources, wherein the listen-before talk procedure further comprises that: over a backoff time, the radio device (11, 12, 13; 1100; 1300) performs measurements on the set of radio resources, on the basis of the measurements, the radio device (11, 12, 13; 1100; 1300) detects that the set of radio resources is available, and upon expiry of the backoff time, the radio device (11, 12, 13; 1100; 1300) performs the radio transmission, and over a backoff time, the radio device (11, 12, 13; 1100; 1300) performs measurements on the set of radio resources, on the basis of the measurements, the radio device (11, 12, 13; 1100; 1300) detects that the set of radio resources is available, and upon expiry of the backoff time, the radio device (11, 12, 13; 1100; 1300) performs the radio transmission, and wherein the grant comprises configuration information indicating, for each of the radio devices (11, 12, 13; 1100; 1300) of the group, a different individual duration of the backoff time to be applied by the radio device (11, 12, 13, 1100; 1300). <EOS>