Method and apparatus for optimizing forward link data rate for radio frequency transmissions to mobile platforms
First Claim
1. A method for monitoring a signal quality of a forward link radio frequency (RF) signal transmitted from a first communications station to a second communications station to maintain a signal quality of said forward link RF signal at a predetermined level, said method comprising:
- transmitting said forward link RF signal from said first communications station to said second communications station;
using said second communications station to receive said forward link RF signal and to generate a signal quality value representative of a signal quality of said received forward link RF signal;
using said second communications station to transmit said signal quality value back to said first communications station in a return link RF signal;
using said first communications station to adjust a data transmission rate for said forward link RF signal to maintain said signal quality at a predetermined level; and
only adjusting said data transmission rate after a predetermined plurality of return link RF signals from said second communications station, representing said signal quality value, has been received.
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Accused Products
Abstract
A system and method for monitoring and adjusting the data transmission rate of a forward link RF signal from a base station to a mobile platform to maintain a desired, minimum link margin with each of the mobile platforms. The system involves using a signal quality monitoring subsystem carried by each mobile platform during the normal course of its operation to transmit signal quality information via a return link to the base station. The base station uses the signal quality information to monitor and adjust the signal quality of subsequent forward link signals transmitted to the mobile platforms in a manner that optimizes the data transmission rate of the forward link signals. The present invention better accounts for time varying factors that influence the signal quality of received forward link signals by the mobile platforms and obviates the need for mobile test platforms or other expensive and relatively complex methods for predicting needed data transmission rates for the forward link signals.
58 Citations
14 Claims
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1. A method for monitoring a signal quality of a forward link radio frequency (RF) signal transmitted from a first communications station to a second communications station to maintain a signal quality of said forward link RF signal at a predetermined level, said method comprising:
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transmitting said forward link RF signal from said first communications station to said second communications station; using said second communications station to receive said forward link RF signal and to generate a signal quality value representative of a signal quality of said received forward link RF signal; using said second communications station to transmit said signal quality value back to said first communications station in a return link RF signal; using said first communications station to adjust a data transmission rate for said forward link RF signal to maintain said signal quality at a predetermined level; and only adjusting said data transmission rate after a predetermined plurality of return link RF signals from said second communications station, representing said signal quality value, has been received. - View Dependent Claims (2, 3, 4, 5)
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6. A method for managing the transmission of information from a base station, via a radio frequency (RF) link, to a space based RF transponder and then to a RF receiver on-board a mobile platform operating within a predetermined geographic coverage region, wherein the mobile platform includes a signal quality monitoring subsystem, said method comprising:
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transmitting said information to said mobile platform via a forward link signal that is relayed by said space based RF transponder to said mobile platform; using said signal quality monitoring subsystem to determine a signal quality of said forward link signal; using said RF transceiver of said mobile platform to transmit a return link signal, via said RF space based transponder, back to said base station, which includes information relating to a signal quality of said forward link signal received by said RF transceiver of said mobile platform; using said base station to adjust a data rate of said forward link signal to achieve a desired level of signal quality of subsequent transmissions of said forward link signal; and wherein using said base station to adjust a data rate of said forward link signal includes; collecting signal quality information via return link signals from said mobile platform; and adjusting said data transmission rate only after said base station determines that said signal quality of said forward link signal has changed by a predetermined value. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A communications system for monitoring a quality of a forward link radio frequency (RF) signal transmitted to a mobile platform operating within a predefined geographic coverage region, the system comprising:
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a RF transceiver carried on said mobile platform; a signal quality monitoring subsystem operably associated with said RF transceiver that operates to generate signal quality information relating to a signal quality of received forward link RE signals from said base station; and a base station for transmitting forward link RF signals to said mobile platform, monitoring return link RF signals transmitted from said RF transceiver of said mobile platform back to said base station, and for determining if said subsequently transmitted forward link RF signals need to be modified to maintain a desired signal quality level; and the base station adapted to only adjust said data transmission rate after a predetermined plurality of return link RF signals from said second communications station, representative of said signal quality value, has been received. - View Dependent Claims (14)
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Specification