In a wireless communication channel, the time per a service interval is distributed among multiple data services. The data services have been allocated airtime quotas in order to comply with their QoS requirements. These airtime quotas are scaled by a factor that is the ratio between, on the one hand, the time available per service interval for accommodating data of these services and, on the other hand, the total of the airtime quotas. This allows the services to use more airtime in case not the entire service interval has been allocated.