Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2005-05-10
2005-05-10
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S553100, C455S450000, C455S451000, C455S452100, C455S423000, C455S061000, C455S063100, C455S550100, C455S063300
Reexamination Certificate
active
06892076
ABSTRACT:
A method and a device used for displaying wideband information to a user has a return channel made through a cellular mobile terminal (CMT) providing interactivity. The device (10) has a first antenna (12) and a second antenna (20), a receiver (14, 16) that is coupled to the first antenna and a transmitter (24) that is coupled to the second antenna. The method includes, prior to receiving information in a symbol-wise manner with the receiver in a first band of radio frequencies, generating a notification of reception with the receiver by asserting a DVB_RX_ON signal (16A) and, in response to the notification, requesting a change of transmitter transmission frequencies from a second band of radio frequencies to a third band of radio frequencies that is predetermined to avoid interference with the reception of the information in the first band of radio frequencies. The transmitter is preferably a cellular mobile terminal transmitter, and the request for a change can be made by initiating a Classmark Change procedure with a cellular mobile terminal wireless network. In one embodiment the first band of radio frequencies comprises a DVB-T 470-862 MHz reception band, the second band of radio frequencies comprises a GSM 880-915 MHz transmission band, and the third band of radio frequencies comprises a higher GSM band, such as the GSM 1800 MHz band or the European 3G band. In other embodiments, such as one practiced in the United States, the CMT call may be rerouted from the CMT 800 MHz band to the CMT 1900 MHz band.
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Leinonen Marko
Maalismaa Juha
Trost William
Zewdu Meless
LandOfFree
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