Importance

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Abstract

A device for wireless, secure transmission of digital information signals utilizing carrier sense multiple access (CSMA) packet communications, or spread spectrum code division multiple access (CDMA) circuits, between a plurality of stations. The device is intended for use within motor vehicles. The digital information signals may be data or compressed voice signals. Each device operates using a visual network access schema under which the operator of each station manually enters, into the device keyboard, the license plate number of the Target vehicle to be contacted. The license plate number of the Target motor vehicle is used by the Sender device to identify the transmission parameters to the Target device. These parameters are the network address, data link address, frequency channel, code division multiple access (CDMA) code, and encryption key. A Target device uses its own license plate number and that of the Sender vehicle to identify the transmission parameters for delivering a response. Each device contains two receive channels; one for reception of broadcast packet messages or CDMA circuits, and the other for directed packet messages, including signalling messages for the CDMA circuits. To support broadcast messages, the use of a pseudo license plate number, or common address, is entered by the operator of the Sender device. A preferred set of broadcast addresses supports specific types of broadcasts, such as, emergency distress messages ('EBROAD'), traffic reports ('TBROAD'), or general broadcast messages ('GBROAD'). The device consists of ten major components.

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First Claim