Method for correcting an error in the frequency generation by a terminal of a wireless communication system

1. A method for correcting an error in generation of a downlink frequency by a frequency synthesizer of a terminal of a terrestrial wireless communication system, the wireless communication system comprising an access network configured to exchange data with the terminal, comprising steps of:

transmitting of a query message on an uplink frequency generated by the frequency synthesizer to the access network by the terminal;

estimating, by the access network, of the error in the generation of the uplink frequency of the query message as a function of a theoretical transmission frequency of the query message by the terminal and an actual frequency of reception of the query message by the access network;

transmitting a response message comprising an item of correction information of the estimated error to the terminal by the access network; and

generating, by the frequency synthesizer of the terminal and as a function of the item of correction information received from the access network, a downlink frequency for reception by the terminal of a broadcast signal transmitted by the access network.

2. The method according to claim 1 , wherein, as the theoretical transmission frequency of the query message is not known a priori by the access network, the query message comprises an item of information and the access network is configured to determine the theoretical frequency over which the query message has been theoretically transmitted by the terminal from the item of information of the query message.

3. The method according to claim 1 , wherein the theoretical frequency over which the query message has been theoretically transmitted by the terminal is a predetermined frequency known a priori by the access network.

4. The method according to claim 1 , wherein the terminal is configured to generate a transmission frequency for a message destined for the access network from the item of correction information received from the access network.

5. The method according to claim 1 , wherein the item of correction information contains the estimated error.

6. The method according to claim 1 , wherein the item of correction information contains a corrected value of the frequency of reception by the terminal of the broadcast signal transmitted by the access network.

7. A terrestrial wireless communication system comprising an access network and at least one terminal, said at least one terminal comprising a frequency synthesizer, wherein:

said at least one terminal comprises a transmitter configured to transmit a query message on an uplink frequency generated by the frequency synthesizer to the access network;

the access network comprises a processor to estimate an error introduced by the frequency synthesizer in generating the uplink frequency of the query message as a function of a theoretical transmission frequency of the query message by said at least one terminal and an actual frequency of reception of the query message by the access network;

the access network comprises a transmitter configured to transmit a response message comprising an item of correction information of said estimated error to said at least one terminal; and

said at least one terminal is configured to receive a broadcast signal transmitted by the access network on a downlink frequency generated by the frequency synthesizer as a function of the item of correction information received from the access network.

8. The terrestrial wireless communication system according to claim 7 , wherein said at least one terminal is configured to transmit a message to the access network on a transmission frequency generated by the frequency synthesizer as a function of the item of correction information received from the access network.