Apparatuses and methods are disclosed for increasing calling capacity in a carrier by dividing timeslots on the carrier into sub-slots and for conveying usage and access rights information for each sub-slot on a carrier. A base station configures a control signal that is associated with each of a plurality of timeslots on a carrier. Each of the plurality of timeslots is divided into sub-slots and specific fields in the control signal are associated with each sub-slot. The base station provides, to mobile stations, at least one of a usage marker or access rights information through the control signal. The mobile stations use the usage marker or access rights information to determine whether transmission of voice traffic and control signaling is permitted on each sub-slot.