GEO-Mobile Radio Interface Specifications (Release 3); Third Generation Satellite Packet Radio Service; Part 4: Radio interface protocol specifications; Sub-part 4: Layer 1 General Requirements; GMR-1 3G 44.004 (V3.3.1)
The present document defines the service offered by the physical layer to the upper layers of the MES-GS interface in the GMR-1 Mobile Satellite System. Its main objective is to provide guidance for the interface between the GMR-1 Technical Specifications in the 45-series and the 44-series. It also specifies the format of signalling channels@ traffic channels (Iu mode) and the order of bit transmission. As far as possible@ the present document makes use of the layering principles of the Reference Model for Open System Interconnection (OSI) as contained in ITU-T Recommendations X.200 [i.1] and X.210 [i.2].