Patent ID: 9225467
Filing Date: 2015-12-29
Classification: H04L

Abstract:
1. A method, carried out by one or both of a transmitting device and a receiving device, for updating a threshold used for selecting a transmission format from a plurality of transmission formats associated with said threshold, a selected transmission format to be used by a transmitting device of a satellite telecommunications system to transmit data packets to the receiving device over a radio-frequency propagation channel, the transmission format associated to said threshold being selected when an estimated value of an instantaneous channel quality is higher than said threshold, said method comprising: updating a table associating a plurality of transmission statistics to respective values of the instantaneous channel quality, said transmission statistics of the table being representative of an amount of estimated errors for a plurality of data packets, said table being updated from estimated errors in data packets that are received by the receiving device via the transmission format associated with the threshold to be updated; and from values of the instantaneous channel quality estimated during reception of said data packets received by the receiving device, updating the threshold to be, according to the updated table, a value of the instantaneous channel quality enabling a predefined value of the transmission statistics to be provided, wherein a satellite of the satellite telecommunications system is in a geostationary orbit, and the transmission statistics of the table are anticipated transmission statistics, and wherein each anticipated transmission statistic, associated to a given value of the instantaneous channel quality, being an expected transmission statistic for data packets that will be received, relative to a point in time when said given value of the instantaneous channel quality was estimated, after expiry of a period of time representative of the time period between a point in time when the instantaneous channel quality is estimated and a point in time when the transmission format, selected according to said estimated value of the instantaneous channel quality, is presented and applied to the receiving device.