DIGITAL CELLULAR RELEASE
Original Publication Date: 1987-Oct-01
Included in the Prior Art Database: 2001-Oct-24
The following is a description of a new signalling method for implementing a mobile release in a cellular radio-telephone system. The current signalling release protocol has the mobile transmit 1.8 seconds of "signal- ling tone" (10K Hz tone) to the base-site to initiate a release. The mobile then unkeys its transmitter, and upon reception of the 1.8 second signalling tone, the base-site drops the call. This release method can have a prob- lem of the base-site falsing on an interfering channel's signalling tone and inappropriately dropping acall. The new release method utilizes digital confirmation, which significantly reduces the probability of incorrect release. decisions. Consideration was given in its design for efficient retrofit into the current cellular system.