NOVEL MULTI-ACCESS CS-P/CD-E SYSTEM AND PROTOCOLS ON SATELLITE CHANNELS APPLICABLE TO A GROUP OF MOBILE USERS IN CLOSE PROXIMITY

摘要

A multiple access RF communication system in which a plurality of mobile user transceivers communicate with a central hub transceiver through an earth orbiting satellite, and wherein groups of mobile user transceivers in close proximity with each other share a common multi-access inbound (to hub) frequency F1 and a common outbound channel (from hub) frequency F0. Each said mobile user transceiver includes a continuously listening receiver for the outbound channel and a half-duplex transceiver on the inbound channel, determining the busy or idle status of the common inbound frequency F0, and a device to indicate the status of the carrier outbound channel, which controls the ability to transmit on the inbound channel.