Modulation of a carrier radio signal by a mobile terminal in a wireless telecommunications network
View Patent ↗A method is provided of transmitting information from a mobile terminal in a wireless telecommunications network. The method involves sending a radio signal from a first base station to a second base station. The mobile terminal modulates the radio signal so as to include the information into the radio signal. The second base station receives the radio signal and decodes the information.
1. A method of transmitting information from a mobile terminal in a wireless telecommunications network, comprising:
sending a wireless radio signal from a first base station towards a second base station,
the mobile terminal modulating said wireless radio signal so as to include said information into said wireless radio signal,
then the second base station receiving over air said modulated wireless radio signal and decoding said information.
2. A method according to claim 1 , in which the modulation comprises one or more of frequency modulation and time modulation.
3. A method according to claim 1 , in which the network is a code division multiple access, CDMA, network, and the modulation comprises code modulation.
4. A method according to claim 1 , in which the radio signal from the first base station to the second base station is also used to transmit data from the first base station to the second base station.
5. A method according to claim 1 , in which the network comprises multiple base stations, each of which establishes radio links with other of the base stations, the mobile terminal:
selecting the base station likely to receive a signal from the mobile terminal with least signal attenuation, and
modulating the radio signal of a radio link to that base station.
6. A wireless telecommunications network comprising
a first base station and a second base station adapted for use in communications with mobile terminals, the first base station being operative to transmit a wireless radio signal to the second base station, the network also comprising a mobile terminal for wireless communications comprising a transmitter and a signal generator;
wherein the signal generator is operative to produce, from information for transmission, a modulating signal that is adapted to modulate the wireless radio signal which is passing said mobile terminal; and
the transmitter is operative to transmit said modulating signal;
the second base station being operative to receive over air the modulated wireless radio signal.
7. A wireless telecommunications network according to claim 6 , in which the mobile terminal further comprises a further signal generator operative to control the transmitter to produce, from information for transmission, a signal to be transmitted direct to a base station without modulating the radio signal transmitted between base stations.
8. A wireless telecommunications network according to claim 7 , wherein the modulating signal generator and further signal generator are selectably operative.
9. A wireless telecommunications network according to claim 8 , in which the mobile terminal includes a control circuit operative to select whether to use the modulating signal generator or the further signal generator dependent on an estimate of signal attenuation to a base station.
10. A wireless telecommunications network according to claim 6 , in which
the mobile terminal comprises a further signal generator operative to control the transmitter to produce, from information for transmission, a signal to be transmitted direct to one of the base stations without modulating the radio signal between base stations; and in which
upon a degradation in received signal quality being determined, one of the base stations instructs the mobile terminal to transfer to use of the further signal generator.
11. A wireless telecommunications network according to claim 6 , in which the network comprises multiple base stations, each of which establishes radio links with others of the base stations, the mobile terminal being operative to select the base station likely to receive a signal from the mobile terminal with least signal attenuation, and modulating the radio signal of a radio link to that base station.