| 摘要 |
1. A methode of transmitting data between a central data radio station (ZFS) comprising a computer (1), and a plurality of mobile data radio stations (MDF) on a single carrier frequency, the central station and the mobile stations having send-receive facilities (5, 10) and the data transmission being by way of a telemetering frame which is subdivided into periods of time, characterized by the following features : - all the data is transmitted in serial PPM-coded telegrams (Fig. 1), - the telemetering frame comprises a time raster which corresponds to the number of raster points (RO-RN) and which is synchronized by the central data radio station (ZFS) by transmitting a synchronization signal (SYNC) after identical periods of time, - each telegram (Fig. 1) starts with a start sign (Stp) and ends with a stop sign (Spp) between which there are provided identification and utilization data and a number of additional data signs subsidiary to the utilization data and serving to ensure transmission, - the raster point (Rp1-Rpn) available the telegram transmission are busied with data telegrams stochastically distributed by the data radio stations (MDF), - a telegram transmission at one or more stochastically busied raster point or points (Rp1 to Rpn) occurs only the mobile station (MDF) ready to transmit identifies such point or points as free due to non-receipt of data from third mobile stations (MDF), - when a stochastically selected raster point (Rp1-Rpn) has been busied, one or n other free raster points is/are stochastically busied, - the central data station (ZFS) is associated in the telemetering frame with at least one raster point (Q) which can be used for data transmission from the central station to the mobile stations (MFD) or which the central station can associate with a particular mobile station for data transmission to the central station and - any data transmission between the mobile station (MFD) and the central station (ZFS) is acknowledged by a radio signal for which there is an acknowledgement of receipt slot (Q1-Qn) at the end of each raster point (Rp1-Rpn). |
