The signalling protocol structure on the radio link for the digital mobile communications system

The significant protocol structure of a radio link using the open systems interconnection (OSI) model for a digital mobile communications system is described. The OSI model is applied to this structure for functional expansion of the system. The layer-three part is fundamentally based on the I-interface of the ISDN. There is a special part for the mobile communications system which emphasizes radio frequency efficiency. A technique to reduce the number of signals and the transmission volume is described. The basic procedures and the supplementary service procedures to which this signaling protocol structure is applied are described