Patent ID: 6442149
Filing Date: 2002-08-27
Classification: H04L,H04Q,H04W

Abstract:
A signal transmission method for carrying out information transmission using fixed length cells on a transmission line for transmission between a mobile station, a base station connected to said mobile station via radio, and a mobileservices switching center connected to said base station via said transmission line, said signal transmission method comprising the steps of:generating said fixed length cells on which said information is to be mounted; preparing frames, each comprising a plurality of cell slots on which said fixed length cells are to be mounted, each of the cell slots corresponding to each of call types transmitted from said mobile station; transferring the cell slots at the same time when the cell slots are generated; using a vacant cell slot in at least one of the frames as a shared cell slot available among the call types, the vacant cell slot being among the cell slots corresponding to the call types, respectively; assigning the shared cell slot to an overflowed call occurring because of varying traffic of each call type; and carrying out periodic transfer of the frames; wherein generation timing of each of said fixed length cells from said information is controlled such that each of said fixed length cells is mounted at the same time when generated on its respective cell slot.