Abstract: A wireless communication system including a cellular access network connected to a cellular network core, the cellular access network including cellular base stations adapted to exchange data with terminals on physical channels, called coordinated access channels, each cellular base station serving a geographical area, all the geographical areas served by the cellular base stations forming a geographical region. The wireless communication system includes random access base stations serving the geographical region, each random access base station being adapted to receive data emitted by terminals on a permanent physical channel, called random access channel, the permanent physical random access channels of the random access base stations using the same radio resources throughout the geographical region.

Abstract: A wireless communication system including a cellular access network connected to a cellular network core, the cellular access network including cellular base stations adapted to exchange data with terminals on physical channels, called coordinated access channels, each cellular base station serving a geographical area, all the geographical areas served by the cellular base stations forming a geographical region. The wireless communication system includes random access base stations serving the geographical region, each random access base station being adapted to receive data emitted by terminals on a permanent physical channel, called random access channel, the permanent physical random access channels of the random access base stations using the same radio resources throughout the geographical region.

Abstract: A method for selecting, by a sending device of a first wireless communication system, a communication mode to be used for the first wireless communication system. The communication mode being selected from among at least two different communication modes associated with different geographical zones. The method includes listening to a second wireless communication system, the second wireless communication system being different from the first wireless communication system. The second wireless communication system having at least two different communication modes associated with different geographical zones. The communication mode used by the second wireless communication system is determined. The communication mode to be used by the first wireless communication system is selected according to the communication mode used by the second wireless communication system.

Abstract: A method for correcting an error in the generation of a frequency by a frequency synthesizer of a terminal of a terrestrial wireless communication system. A query message is transmitted by the terminal. Error in the generation of the frequency of the query message is estimated by an access network 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. A response message comprising an item of correction information is transmitted by the access network. A frequency of reception by the terminal of a broadcast signal transmitted by the access network is generated by the frequency synthesizer of the terminal and as a function of the item of correction information received by the access network.

Abstract: A method for transmitting broadcast signals from a group of base stations to terminals of a wireless communication system. Each base station having a coverage area. The coverage areas of the base stations of the group are distributed geographically such as to serve a geographical area. Since the broadcast signals are of limited duration and are transmitted in a frequency band used by all of the base stations of the group, the base stations of the group are time-synchronized in relation to one another. The broadcast signals from the base stations of the group are time-multiplexed. In addition, the wireless communication system has multiple geographical regions. Each region includes multiple groups of base stations), and the broadcast signals of different geographical regions are time-multiplexed.

Abstract: A method for selecting, by a sending device of a first wireless communication system, a communication mode to be used for the first wireless communication system. The communication mode being selected from among at least two different communication modes associated with different geographical zones. The method includes listening to a second wireless communication system, the second wireless communication system being different from the first wireless communication system. The second wireless communication system having at least two different communication modes associated with different geographical zones. The communication mode used by the second wireless communication system is determined. The communication mode to be used by the first wireless communication system is selected according to the communication mode used by the second wireless communication system.

Abstract: A method for correcting an error in the generation of a frequency by a frequency synthesizer of a terminal of a terrestrial wireless communication system. A query message is transmitted by the terminal. Error in the generation of the frequency of the query message is estimated by an access network 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. A response message comprising an item of correction information is transmitted by the access network. A frequency of reception by the terminal of a broadcast signal transmitted by the access network is generated by the frequency synthesizer of the terminal and as a function of the item of correction information received by the access network.

Abstract: A method for transmitting broadcast signals from a group of base stations to terminals of a wireless communication system. Each base station having a coverage area. The coverage areas of the base stations of the group are distributed geographically such as to serve a geographical area. Since the broadcast signals are of limited duration and are transmitted in a frequency band used by all of the base stations of the group, the base stations of the group are time-synchronized in relation to one another. The broadcast signals from the base stations of the group are time-multiplexed. In addition, the wireless communication system has multiple geographical regions. Each region includes multiple groups of base stations), and the broadcast signals of different geographical regions are time-multiplexed.

Abstract: The device comprises preprocessing circuitry which deliver to a phase locked loop a preprocessed signal obtained from a replica of the incident digital signal staggered in time by a fraction of the cycle of the clock signal of the phase locked loop. This device then allows a fast synchronization of the clock of the phase locked loop in relation to the incident digital signal, in particular at high transmission rates.