Inroute training in a two-way satellite system
First Claim
1. A method for ranging in a radio frequency communications system that includes a satellite configured to support two-way communication, the method comprising:
- selecting a transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme;
transmitting a ranging message according to the selected transmission channel class over a channel;
selectively modifying the transmission channel class based upon characteristics of the channel; and
receiving a request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel.
13 Assignments
0 Petitions
Accused Products
Abstract
An approach for ranging in a radio frequency communications system is disclosed. A transmission channel class that includes at least one of transmission rate, modulation scheme, coding scheme, and transponder footprint is selected by a terminal. The terminal transmits a ranging message according to the selected transmission channel class over a channel. The transmission channel class is selectively modified based upon characteristics of the channel. Accordingly, an optimal transmission channel class is determined for a particular terminal. The above approach has particular applicability to a two-way satellite communications system.
37 Citations
29 Claims
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1. A method for ranging in a radio frequency communications system that includes a satellite configured to support two-way communication, the method comprising:
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selecting a transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme; transmitting a ranging message according to the selected transmission channel class over a channel; selectively modifying the transmission channel class based upon characteristics of the channel; and receiving a request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel. - View Dependent Claims (2, 3, 4, 5)
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6. A terminal apparatus for supporting ranging over a radio frequency communications system that includes a satellite that supports bi-directional communication, the apparatus comprising:
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a transmit unit that is configured to transmit a ranging message according to a selected transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme over a channel; means for selectively modifying the transmission channel class based upon characteristics of the channel; and a receive unit configured to receive request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel. - View Dependent Claims (7, 8, 9, 10)
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11. A computer-readable medium carrying one or more sequences of one or more instructions for ranging in a radio frequency communications system that includes a satellite configured to support two-way communication, the one or more sequences of one or more instructions including instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of:
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selecting a transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme; initiating transmission of a ranging message according to the selected transmission channel class over a channel; selectively modifying the transmission channel class based upon characteristics of the channel; and receiving a request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel. - View Dependent Claims (12, 13, 14, 15)
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16. A method for ranging in a radio frequency communications system that includes a satellite configured to support two-way communication, the method comprising:
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receiving a ranging message from a terminal over a channel associated with a transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme; performing ranging measurements corresponding to the message; outputting a ranging response message based upon the ranging measurements, the ranging response being transmitted to the terminal, wherein the terminal selectively modifies the transmission channel class based upon the ranging response; and transmitting a request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel. - View Dependent Claims (17, 18, 19, 20)
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21. A computer-readable medium carrying one or more sequences of one or more instructions for ranging in a radio frequency communications system that includes a satellite configured to support two-way communication, the one or more sequences of one or more instructions including instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of:
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performing ranging measurements corresponding to a ranging message received from a terminal over a channel associated with a transmission channel class that includes at least one of transmission rate, modulation scheme, and coding scheme; outputting a ranging response message based upon the ranging measurements, the ranging response being transmitted to the terminal, wherein the terminal selectively modifies the transmission channel class based upon the ranging response; and transmitting a request to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel. - View Dependent Claims (22, 23, 24, 25)
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26. A satellite communications system comprising:
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a terminal configured to perform ranging to determine a target transmission rate among a plurality of transmission rates by transmitting a ranging message over a satellite; and a hub configured to receive the ranging message and to perform ranging measurements corresponding to the message, the hub outputting a ranging response message that includes ranging parameters, the ranging response being transmitted to the terminal, wherein the terminal adapts the target transmission rate based upon the ranging response, wherein the hub instructs the terminal to perform re-ranging based upon re-ranging criteria that includes at least one of location of the satellite, and the characteristics of the channel, and the satellite supports bi-directional communications, and wherein the hub instructs the terminal to modify the target transmission rate to perform load balancing. - View Dependent Claims (27, 28, 29)
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Specification