Digital celluar/PCS standards development for STY-III secure bearer service options-reliability simulation

The U.S. government is participating in TDMA and CDMA cellular/PCS standard bodies to develop bearer service option modes that will enable secure end-to-end digital voice between cellular handsets and existing STLT-m (Secure Terminal Unit, 3rd generation, or "STU3") phones. A requirement is that handsets be able to reliably detect brief analog "go-secure" signaling sent by a STU3 as it attempts to transition from plain voice to encrypted voice mode, particularly under conditions of fading errors. A simulation experiment is designed and conducted, demonstrating the feasibility of detecting such a proposed bearer option request under many environmental conditions.