Patent ID: 7620021

Claim:
A timeslot assignment method used for time division duplex in a mobile communication system which includes a base station and a mobile station, wherein, in a frame used in the mobile communication system, control mini-slots each of which corresponds to each timeslot in a next frame are provided, in which each of said control mini-slot includes at least an assignment state of a corresponding timeslot, said timeslot assignment method comprising: said mobile station finding an idle timeslot of said next frame by checking information in said control mini-slots in said frame, and sending a slot assignment request to said base station by using said idle timeslot; said base station assigning at least a timeslot based on said slot assignment request, and sending information including information of timeslot assignment to said mobile station by using a control mini-slot corresponding to said idle timeslot further comprising the steps of: said base station receiving information including a desired number of timeslots in a duration of a frame; when said slot assignment request indicates a predetermined service class and when a number of idle timeslots in said next frame is smaller than said desired number of timeslots, said base station assigning the idle timeslots and a part of timeslots that are assigned for another mobile station having a service class lower than the predetermined service class of said mobile station after releasing said part of timeslots; and when said number of idle timeslots in said next frame is larger than said desired number of timeslots, said base station assigning timeslots the number of which is larger than said desired number of timeslots and is equal to or less than a maximum number of timeslots indicated by said slot assignment request for said mobile station.