Patent ID: 7616186

Claim:
A cellular communication terminal system comprising a cellular communication terminal and an acceleration reference device, the cellular communication terminal comprising: a cellular transceiver that is configured to communicate over a wireless cellular interface with a cellular network; a display device; a first accelerometer that is configured to generate acceleration information that is indicative of movement of the cellular communication terminal; and a first controller that is configured to communicate through the cellular transceiver with the cellular network according to a cellular communication protocol, and to display on the display device information and an indicative of a user's selection among the displayed information, and configured to selectively operate in a mouse mode during which the controller moves the displayed indication responsive to the relative movement of the cellular communication terminal; the acceleration reference device comprising: a second accelerometer that is configured to generate acceleration information that is indicative of movement of the acceleration reference device, separately from the information that is indicative of movement of the cellular communication terminal; a second communication interface that is configured to be communicatively coupled to the cellular communication terminal; a second controller that is configured to generate movement information based on the acceleration information from the second accelerometer and to communicate the acceleration information through the second communication interface to the cellular communication terminal; and the cellular communication terminal being configured to calculate the relative terminal movement by subtracting the acceleration information of the second accelerometer from the acceleration information of the first accelerometer.