Methods for transmitting and receiving data in a digital telecommunications system

1. A method for transmitting data by a terminal to a station of a digital telecommunications system, comprising the steps of: simultaneously transmitting a first data stream and a second data stream to the station; encoding the first data stream in data packets; encoding the second data stream in a frequency-hopping pattern; and consecutively transmitting the data packets, in which the first data stream is encoded, in respective frequency bands of a frequency resource, the frequency bands are determined according to the frequency-hopping pattern in which the second data stream is encoded.

2. The transmission method as claimed in claim 1 , further comprising the steps of associating a theoretical frequency-hopping pattern with the terminal; and encoding the second data stream in a modification of the theoretical frequency-hopping pattern.

3. The transmission method as claimed in claim 2 , further comprising the step of modifying or removing at least one theoretical frequency hop from the theoretical frequency-hopping pattern to encode the second data stream.

4. The transmission method as claimed in claim 3 , further comprising the step of modifying or removing only theoretical frequency hops corresponding to predefined indices of the theoretical frequency-hopping pattern to encode the second data stream.

5. A method for receiving, by the station of a digital telecommunications system, data transmitted by the terminal in accordance with the transmission method as claimed in claim 1 , comprising the steps of: searching, in a frequency resource, for data packets transmitted by the terminal; extracting the first data stream from the detected data packets; measuring the frequency bands in which the data packets have been detected; extracting the second data stream according to measurements of the frequency bands in which the data packets have been detected.

6. The reception method as claimed in claimed 5 , further comprising the step of comparing the measurements of the frequency bands in which the data packets have been detected to a theoretical frequency-hopping pattern associated with the terminal.

7. The reception method as claimed in claim 5 , wherein the data packets incorporate a counter incremented by the terminal on each new transmission; and further comprising the step of extracting the second data stream according to the counter of the data packets.

8. The reception method as claimed in claim 5 , further comprising the steps of encrypting a part of the data packets with a rolling key incremented by the terminal at each new transmission; and extracting the second data stream according to the rolling keys used for encrypting the data packets.

9. A terminal of a digital telecommunications system comprises a transmitter configured to transmit data to a station, the transmitter: simultaneously transmits a first data stream and a second data stream to the station; encodes the first data stream in data packets; encodes the second data stream in a frequency-hopping pattern; and consecutively transmits the data packets, in which the first data stream is encoded, in respective frequency bands of a frequency resource, the frequency bands are determined according to the frequency-hopping pattern in which the second data stream is encoded.

10. A station of a digital telecommunications system comprises a receiver configured to receive data from the terminal of claim 9 , the receiver: searches, in a frequency resource, for the data packets transmitted by the terminal; extracts the first data stream from the detected data packets; measures frequency bands in which the data packets have been detected; extracts the second data stream according to measurements of the frequency bands in which the data packets have been detected.