Two-way and unidirectional wireless messaging system, radio paging and supervisory control / telemetry, bidirectional and unidirectional messaging units, and receiving base station.

摘要

"SYSTEMS FOR THE EMISSION OF MESSAGES WITHOUT BIDIRECTIONAL AND UNIDIRECTIONAL WIRELESS, RADIOBUSCA (PAGING) AND SUPERVISORY CONTROL / TELEMETRY, UNITS EMITTING BIDIRECTIONAL AND UNIDIRECTIONAL MESSAGES, AND, BASE STATION FOR RECEPTION". A wireless messaging system is introduced including a bidirectional messaging system. The bidirectional messaging system uses conventional protocols for the sending channel and a transmission scheme by direct sequence propagation spectra for the reverse channel. Included are transmitters (16) for transmitting the sender channel signal using a conventional protocol, bidirectional message sending units (12) for receiving the signal and for transmitting a signal on the reverse channel using spread spectrum techniques and receiving base stations ( 16) to receive the reverse channel signals from the bidirectional message sending units. The receiving base stations (14) send received messages to a network center (28) for processing forwarding to an email port (22), facsimile port (24), voice mail port (26) or client applications (27). For radio paging applications, a message sending terminal issues messages to be transmitted to the transmitters.