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Multiple satellite repeater management system using frame error rate for diversity selection
| Details |
Inventors: Wiedeman, Robert A.; Monte, Paul A.; Penwarden, Kent A.;
Assignee: Globalstar L.P. (San Jose, CA)
Primary Examiner: Le; Thanh Cong
Assistant Examiner: Lei; Tsuleun
Attorney, Agent or Firm: Ohlandt, Greeley, Ruggiero & Perle, L.L.P.
A method for operating a mobile satellite telecommunications system has steps of (a) providing a user terminal that is operable to simultaneously receive a communication signal from a gateway via a plurality of satellites; and, (b) at the gateway, selectively transmitting the communication to one satellite or a plurality of satellites each having a coverage area that includes a current location of the user terminal. The step of selectively transmitting includes a step of considering a plurality of factors, including a current reception state of the user terminal, a current state of satellite power of at least one of the plurality of satellites, and a predicted required state of satellite power of the at least one satellite. The current reception state of the user terminal is indicated by a received signal quality indicator, which in the preferred embodiment is expressed as the Frame Error Rate (FER). If the value of the FER increases above a threshold level the number of selected satellites is increased, thereby increasing satellite diversity, and if the FER decreases below the threshold level the number of selected satellites is decreased, thereby decreasing satellite diversity. In addition, when a plurality of satellites are selected, the power through each selected satellite is controlled proportionally. The overall effect is conserve satellite power and optimize satellite power consumption, so as to satisfy future demand for the satellite's circuits. |
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DETAILED DESCRIPTION The foregoing and other problems are overcome and the objects of the invention are realized by methods and apparatus in accordance with embodiments of this invention.
Disclosed herein is a a mobile satellite telecommunications system, and a method for operating the system, which will provide a real time method of accomplishing satellite constellation power optimization.
The method comprises the steps of (a) providing a user terminal that is operable to simultaneously receive a communication signal from a ground station or gateway via a plurality of satellites; and, (b) at the ground station, selectively transmitting the communication to one satellite or a plurality of satellites each having a coverage area that includes a current location of the user terminal.
In accordance with this invention the step of selectively transmitting includes a step of considering a plurality of factors, including a current reception state of the user terminal, a current state of satellite power of at least one of the plurality of satellites, and a predicted required state of satellite power of the at least one satellite.
The current reception state of the user terminal is indicated by a received signal quality indicator, which in the preferred embodiment is expressed as the Frame Error Rate (FER).
In one embodiment the FER is determined in the user terminal from a forward link transmission from the gateway, and the method further includes a step of sending an indication of the FER to the ground station using a reverse link transmission.
In another embodiment the FER is determined in the ground station from a reverse link transmission from the user terminal.
Preferably the indication of the Frame Error Rate is based on a relationship of a current value of the Frame Error Rate to previous values of the Frame Error Rate.
If the value of the FER increases above a threshold level the number of selected satellites is increased, thereby increasing satellite diversity, and if the FER decreases below the threshold level the number of selected satellites is decreased, thereby decreasing satellite diversity
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