Digital video broadcast-terrestrial (DVB-T) receiver interoperable with a GSM transmitter in a non-interfering manner using classmark change procedure

• US 20030228892A1
• Filed: 06/05/2002
• Published: 12/11/2003
• Est. Priority Date: 06/05/2002
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Leinonen, Marko, Maalismaa, Juha
• Granted Patent: US 6,892,076 B2
• Time in Patent Office: Days
• US Class Current: 455/575.7
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04

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 bit-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 GSM1800 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.

Claims

1. In a device comprising a first antenna and a second antenna, a method for operating a receiver coupled to the first antenna in combination with a transmitter coupled to the second antenna, comprising:

generating, prior to receiving information with the receiver in a first band of radio frequencies, a notification of reception with the receiver; and

in response to the generated notification, determining whether the transmitter is operating in a second band of radio frequencies or in a third band of radio frequencies, and if it is determined that the transmitter is operating in the second band of radio frequencies, requesting a change of transmitter transmission frequencies from the second band of radio frequencies to the third band of radio frequencies that is predetermined to avoid interference with the reception of the information in the first band of radio frequencies.

2. A method as in claim 1, where the transmitter is a cellular mobile terminal transmitter, and where the request for a change is made by initiating a Classmark Change procedure with a cellular mobile terminal wireless network.

3. A method as in claim 1, where the first band of radio frequencies comprises 470-862 MHz, where the second band of radio frequencies comprises 880-915 MHz, and where the third band of radio frequencies lies above 1700 MHz.

4. A method as in claim 1, where the first band of radio frequencies comprises a DVB-T 470-862 MHz reception band, where the second band of radio frequencies comprises a GSM 880-915 MHz transmission band, and where the third band of radio frequencies comprises the GSM1800 MHz band.

5. A method as in claim 1, where the first band of radio frequencies comprises a DVB-T 470-862 MHz reception band, where the second band of radio frequencies comprises a GSM 880-915 MHz transmission band, and where the third band of radio frequencies comprises the European 3G band.

6. A method as in claim 1, where the first band of radio frequencies comprises a 794-806 MHz reception band, where the second band of radio frequencies comprises a CMT 824-849 MHz transmission band, and where the third band of radio frequencies comprises the GSM 1900 MHz band.

7. A device comprising a first antenna and a second antenna, a receiver coupled to said first antenna, a transmitter coupled to said second antenna, and a display device for displaying at least information that is received through said first antenna, said receiver receiving information in a first band of radio frequencies and comprising a first data processor for processing the received bits, said device further comprising a second data processor controlling transmission from said second antenna in a different band of radio frequencies, said first data processor generating a notification of reception with the receiver prior to receiving information in the first band of radio frequencies and said second data processor determining, in response, whether the transmitter is operating in a second band of radio frequencies or in a third band of radio frequencies, and if said second data processor determines that the transmitter is operating in the second band of radio frequencies, said second data processor transmitting a request to change transmitter transmission frequencies from the second band of radio frequencies to the third band of radio frequencies that is predetermined to avoid interference with the reception of the information in the first band of radio frequencies.

8. A device as in claim 7, where the transmitter is a cellular mobile terminal transmitter, and where the request for a change is made by initiating a Classmark Change procedure with a cellular mobile terminal wireless network.

9. A device as in claim 7, where the first band of radio frequencies comprises 470-862 MHz, and where the third band of radio frequencies lies above 1700 MHz.

10. A device as in claim 7, where the first band of radio frequencies comprises a DVB-T 470-862 MHz reception band, and where the transmitter requests a change from a GSM 880-915 MHz transmission band to the second band of radio frequencies that comprises the GSM1800 MHz band.

11. A device as in claim 7, where the first band of radio frequencies comprises a DVB-T 470-862 MHz reception band, and where the transmitter requests a change from a GSM 880-915 MHz transmission band to the second band of radio frequencies that comprises the European 3G band.

12. A device as in claim 7, where the first band of radio frequencies comprises a 794-806 MHz reception band, where the second band of radio frequencies comprises a CMT 824-849 MHz transmission band, and where the third band of radio frequencies comprises the GSM 1900 MHz band.

13. A portable, battery powered device comprising a display screen for displaying information received through a first antenna by a receiver operating in a DVB-T 470-862 MHz reception band;

and also comprising a multi-band GSM transmitter, said device further comprising means for generating a notification of reception with the receiver prior to receiving information and means, responsive to the notification when operating in a GSM900 MHz band, for requesting a change of transmitter transmission frequencies from the GSM900 MHz band to one of a GSM1800 MHz band or a European 3G band to avoid interference with the reception of the information in the DVB-T 470-862 MHz reception band.

14. A device as in claim 13, where the request for a change of transmitter transmission frequencies is made by initiating a Classmark Change procedure with a GSM wireless network.

15. A portable, battery powered device comprising a display screen for displaying information received through a first antenna by a receiver operating in a digital television reception band that extends to 806 MHz, and also comprising a multi-band CMT transmitter, said device further comprising means for generating a notification of reception with the receiver prior to receiving information and means, responsive to the notification when operating in a CMT 800 MHz band, for requesting a change of transmitter transmission frequencies from the CMT 800 MHz band to a CMT 1900 MHz band to avoid interference with the reception of the information in the digital television reception band.

16. A device as in claim 15, where the request for a change of transmitter transmission frequencies is made by initiating a Classmark Change procedure with a CMT wireless network.