Telecommunications – Transmitter and receiver at separate stations – With control signal
Reexamination Certificate
1999-01-14
2001-10-02
Maung, Nay (Department: 2681)
Telecommunications
Transmitter and receiver at separate stations
With control signal
C455S522000, C455S013400
Reexamination Certificate
active
06298220
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates in general to satellite and terrestrial radio communications channels. More particularly, it relates to an improved system of conserving transmission power over satellite and terrestrial radio communications channels, while maintaining an acceptable signal quality level.
(b) Description of Related Art
For both communications satellites and terrestrial radio, there is often the need to conserve the transmitted power of signals sent over the communications channels, on both an individual and a collective basis. However, this need to conserve transmitted power must be balanced by a conflicting need to maintain an acceptable signal quality, often in the presence of variable radio propagation conditions. The transmitted signals may represent voice, data and/or video.
Conserving signal transmission power in a communications system calls for an adaptive method of regulating the transmit power of each individual communications channel based on the received signal quality at the signal's destination. In general, a power control/conservation system should be responsive to rapidly varying propagation conditions, exhibit dynamic stability and effective transient response of the regulatory process, maintain an acceptable or desired signal quality, and deliver significant power savings even in adverse propagation environments.
The present invention is a power conservation/control system that achieves the aforementioned and other goals.
SUMMARY OF THE INVENTION
The present invention addresses the aforementioned goals in a system for controlling/conserving signal transmission power in a communications system. The system generally includes a first unit having a transmitter and a receiver, a second unit having a transmitter and a receiver, a forward communications channel between the first unit transmitter and the second unit receiver, and a reverse communications channel between the second unit transmitter and the first unit receiver. In operation, the system determines the received signal power needs of the second unit receiver. It then generates a reverse channel explicit-power-request (EPR) command based on a determination of the received signal power needs of the second unit receiver. The reverse channel EPR command represents an absolute power level at which the first unit transmitter should transmit signals over the forward communications channel. In general, this reverse channel explicit-power-request command communicates the absolute power level in a manner that is independent of the power level at which the first unit transmitter had previously been transmitting with. The system also generates a forward channel explicit-power-notification (EPN) message based on a determination of the transmitted signal power from the first unit transmitter. The forward channel explicit-power-notification message represents an absolute power level at which the first unit transmitter is transmitting signals over the forward communications channel.
The invention itself, together with further objects and attendant advantages, will best be understood by reference to the following detailed description, taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4777653 (1988-10-01), Bonnerot et al.
patent: 5487180 (1996-01-01), Ohtake
patent: 5887245 (1999-03-01), Lindroth et al.
patent: 5926747 (1999-07-01), Komara et al.
patent: 5982760 (1999-11-01), Chen
patent: 5987333 (1999-11-01), Sole
Barnhart Andrew W.
Mathews Neville
Parr Michael
Hughes Electronics Corporation
Maung Nay
Sales Michael W.
Trinh Sonny
Whelan John T.
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