Patent Number: 6,169,884

Title: Method and apparatus for reducing power in radio transmitters

Abstract: A mechanism is provided for substantially reducing heat buildup within a mobile radio device having a radio transmitter. The invention is particularly applicable to PC Card wireless modems. In accordance with one aspect of the invention, device temperature in a mobile radio device is controlled by monitoring the temperature of the mobile radio device; if the temperature of the mobile radio device exceeds a threshold then, when the mobile radio device is to transmit information, transmission power of the mobile radio device is reduced, thereby reducing the amount of heat generated within the mobile radio device and allowing the temperature of the mobile radio device to decrease. Transmission power is reduced sufficiently to allow the temperature of the mobile radio to decrease but not so much as to affect the reliability of transmission in the typical case. Transmission power may also be reduced by, instead of reducing the power level, inserting brief pauses at intervals during the transmission, the transmit amplifier being turned off during such pauses and, in particular, inserting brief pauses into the inaudible SAT signal when a host computer coupled to the mobile radio device is receiving data from the mobile radio device. The pauses are made sufficiently short in duration that the radio connection is not lost.

Inventors: Funk; Gregory John (Delta, CA)

Assignee: Sierra Wireless, Inc.

International Classification: H04B 1/38 (20060101); H04B 1/02 (20060101); H04B 1/036 (20060101); H04B 017/00 ()

Expiration Date: 01/02/2018