초록 ▼

A cellular telephonic communication system is provided with privacy in the transmission of a dialed number from a mobile station to a base station. This is accomplished by transmitting from the base station a modified origination message followed by an origination continuation message. In the origin

A cellular telephonic communication system is provided with privacy in the transmission of a dialed number from a mobile station to a base station. This is accomplished by transmitting from the base station a modified origination message followed by an origination continuation message. In the origination message, the dialed number is omitted. The origination message is transmitted by the access channel, and includes a control bit indicating that the origination message is incomplete and is to be followed by an origination continuation message. The base station responds by assigning forward and reverse traffic channels to the mobile station. The mobile station then employs the reverse traffic channel to transmit the dialed number to the base station. In the traffic channels, the private long code mask is employed for spreading the spectrum of the reverse traffic channel data which includes the dialed number. Thereby, an intruder listening to the telephonic communication cannot determine the identity of the called party because the intruder does not know the spreading code used.

대표청구항 ▼

[ What is claimed is:] [1.] In a cellular communication system for telephonic communication between a base station and a plurality of mobile stations, a method of securely initiating a telephonic communication by a mobile station, comprising the steps of:transmitting, via, an access channel, a modif

[ What is claimed is:] [1.] In a cellular communication system for telephonic communication between a base station and a plurality of mobile stations, a method of securely initiating a telephonic communication by a mobile station, comprising the steps of:transmitting, via, an access channel, a modified origination message from a mobile station to a base station, the modified origination message having a dialed number field set to show an absence of a dialed number, and a More.sub.-- Field set to indicate a following origination continuation message;placing the dialed number in the origination continuation message;transmitting the origination continuation message from the mobile station to the base station via a traffic channel; andproviding greater security to said traffic channel than to said access channel.