A method of a network node of a wireless communication system adapted to operate in association with first and second wireless communication devices, the first wireless communication device being associated with a first latency requirement and the second wireless communication device being associated with a second latency requirement, wherein a latency of the second latency requirement is lower than a latency of the first latency requirement, the method comprising: receiving, from the first wireless communication device, a first scheduling request (211, 391) for uplink transmission by the first wireless communication device; transmitting, to the first wireless communication device, a first scheduling grant (212, 392) in response to the first scheduling request, the first scheduling grant indicating an allocated first communication resource for the uplink transmission by the first wireless communication device; receiving, from the second wireless communication device and simultaneously with or after transmitting the first scheduling grant, a second scheduling request (213, 393) for uplink transmission by the second wireless communication device; characterized by: determining whether the first communication resource and an allocated second communication resource for the uplink transmission by the second wireless communication device at least partly overlap; transmitting, to the second wireless communication device, a second scheduling grant (214, 394) in response to the second scheduling request, the second scheduling grant indicating the second communication resource; and if it is determined that the first and second communication resources at least partly overlap, transmitting, to the first wireless communication device, a scheduling grant annulment instruction (215, 395) for preventing the uplink transmission by the first wireless communication device using the first communication resource. receiving, from the first wireless communication device, a first scheduling request (211, 391) for uplink transmission by the first wireless communication device; transmitting, to the first wireless communication device, a first scheduling grant (212, 392) in response to the first scheduling request, the first scheduling grant indicating an allocated first communication resource for the uplink transmission by the first wireless communication device; receiving, from the second wireless communication device and simultaneously with or after transmitting the first scheduling grant, a second scheduling request (213, 393) for uplink transmission by the second wireless communication device; characterized by: determining whether the first communication resource and an allocated second communication resource for the uplink transmission by the second wireless communication device at least partly overlap; transmitting, to the second wireless communication device, a second scheduling grant (214, 394) in response to the second scheduling request, the second scheduling grant indicating the second communication resource; and if it is determined that the first and second communication resources at least partly overlap, transmitting, to the first wireless communication device, a scheduling grant annulment instruction (215, 395) for preventing the uplink transmission by the first wireless communication device using the first communication resource. determining whether the first communication resource and an allocated second communication resource for the uplink transmission by the second wireless communication device at least partly overlap; transmitting, to the second wireless communication device, a second scheduling grant (214, 394) in response to the second scheduling request, the second scheduling grant indicating the second communication resource; and if it is determined that the first and second communication resources at least partly overlap, transmitting, to the first wireless communication device, a scheduling grant annulment instruction (215, 395) for preventing the uplink transmission by the first wireless communication device using the first communication resource.