Method and apparatus for power cutback in a simultaneous dual frequency band call
First Claim
1. A method of operating a dual frequency band transmit device, the method comprising:
- determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device;
determining if transmit power in the first frequency band is above a threshold power; and
reducing maximum transmit power in the second frequency band by an amount inversely proportional to transmit signal bandwidth in the second frequency band if the transmit frequency in the first frequency band combined with the transmit frequency in the second frequency band causes receiver desensitization at the device and if the transmit power in the first frequency band is above the threshold power.
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Accused Products
Abstract
A method and apparatus can cut back power in a simultaneous dual frequency band call. The method may operate a dual frequency band transmit device. The method may include determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device. The method may include determining if the transmit power in the first frequency band is above a threshold power. The method may include reducing maximum transmit power in the second frequency band by an amount proportional to transmit power in the first frequency band and transmit signal bandwidth in the second frequency band in only the portion of the second frequency band where a resultant frequency component can cause desensitization.
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Citations
16 Claims
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1. A method of operating a dual frequency band transmit device, the method comprising:
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determining if a transmit frequency in a first frequency band from the device combined with a transmit frequency in a second frequency band from the device causes receiver desensitization at the device; determining if transmit power in the first frequency band is above a threshold power; and reducing maximum transmit power in the second frequency band by an amount inversely proportional to transmit signal bandwidth in the second frequency band if the transmit frequency in the first frequency band combined with the transmit frequency in the second frequency band causes receiver desensitization at the device and if the transmit power in the first frequency band is above the threshold power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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a first transceiver configured to transmit in a first frequency band; a second transceiver configured to transmit in a second frequency band; a controller coupled to the first transceiver and the second transceiver, the controller configured to control operations of the apparatus; a power cutback module coupled to the controller, the power cutback module configured to determine if a transmit frequency in the first frequency band combined with a transmit frequency in the second frequency band causes receiver desensitization, configured to determine if transmit power in the first frequency band is above a threshold power, and configured to reduce the maximum transmit power in the second frequency band by an amount inversely proportional transmit signal bandwidth in the second frequency band if the transmit frequency in the first frequency band combined with the transmit frequency in the second frequency band causes receiver desensitization at the device and if the transmit power in the first frequency band is above the threshold power. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus comprising:
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a first transceiver configured to transmit in a first frequency band at a transmit power; a second transceiver configured to transmit in a second frequency band; a controller coupled to the first transceiver and the second transceiver, the controller configured to control operations of the apparatus; a user interface coupled to the controller, the user input configured to receive input from a user; a power cutback module coupled to the controller, the power cutback module configured to determine if a transmit frequency in the first frequency band combined with a transmit frequency in the second frequency band causes receiver desensitization, configured to determine if the transmit power in the first frequency band is above a threshold power, and configured to reduce maximum transmit power in the second frequency band by an amount inversely proportional to transmit signal bandwidth in the second frequency band if the transmit frequency in the first frequency band combined with the transmit frequency in the second frequency band causes receiver desensitization at the device and if the transmit power in the first frequency band is above the threshold power, wherein desensitization comprises reduced receiver sensitivity from a strong off-channel signal overloading a receiver front end and reducing the sensitivity to weaker on-channel signals. - View Dependent Claims (15, 16)
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Specification