DUAL MODE SYMMETRIC/ASYMMETRIC COMMUNICATION CONTROL SYSTEM

摘要

PURPOSE: A dual mode symmetric/asymmetric communication control system is provided to transmit in the uplink in either a wide band mode of operation or in a narrow band mode of operation with a transceiver capable of being communicated by one protocol selected among at least two carrier protocols. CONSTITUTION: A satellite-cellular communication system includes a satellite based transceiver for transceiving two-way communications originated at a user terminal. As a part of call set up, controller determines whether the user terminal should transmit in the uplink in either a wide band mode of operation or in a narrow band mode of operation. The controller then specifies to the user terminal the mode of operation through the transceiver. Whether the user terminal transmits in the uplink in a wide band or in a narrow band mode depends upon factors including the type of device, channel usage and efficiency in the channels to and from the satellite transceiver and the signal quality of the signals received at the transceiver.