Data transmission system with automatic repeat request
First Claim
1. In an HF radio communication system for transmitting data comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, the method comprising the steps of:
- (A) providing each radio station with a plurality of predetermined channel frequencies for transmission which have acceptable levels of noise and interference, and providing each such channel frequency with a predetermined reserve channel frequency to which transmission may be changed;
(B) transmitting data from a first of said radio stations on one of said predetermined channel frequencies in the form of a data packet, said packet including one or more blocks of data encoded with an error correcting code;
(C) receiving and decoding the transmitted data packets at a second of said radio stations and correcting errors, and automatically transmitting a request to said first station for retransmitting of a data packet should it be received with more than a predetermined number of errors;
(D) determining the error rate at said second radio station in received data packets;
(E) transmitting a request to said first radio station from said second radio station to reduce the rate of data transmission if the error rate is greater than a predetermined amount over a predetermined time interval of data transmission; and
(F) transmitting a request to said first radio station from said second radio station to change the channel frequency to said predetermined reserve channel frequency if said step of transmitting a request to said first radio station to reduce the rate of data trasmission does not reduce the error rate below said predetermined amount.
3 Assignments
0 Petitions
Accused Products
Abstract
A data transmission system comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, wherein data signals are transmitted as packets including one or more blocks of data encoded with an error correcting code, wherein each station is arranged automatically to issue a request for repeat of a packet of data should it receive a packet containing errors which cannot be corrected, and wherein should the error rate in received packets be more than a predetermined amount over a predetermined interval of data transmission, the system is arranged automatically to reduce the rate of data transmission within each packet and/or change the channel frequency.
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Citations
10 Claims
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1. In an HF radio communication system for transmitting data comprising a plurality of radio stations, each station including a transceiver with associated encoding/decoding means for transmitting/receiving data, the method comprising the steps of:
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(A) providing each radio station with a plurality of predetermined channel frequencies for transmission which have acceptable levels of noise and interference, and providing each such channel frequency with a predetermined reserve channel frequency to which transmission may be changed; (B) transmitting data from a first of said radio stations on one of said predetermined channel frequencies in the form of a data packet, said packet including one or more blocks of data encoded with an error correcting code; (C) receiving and decoding the transmitted data packets at a second of said radio stations and correcting errors, and automatically transmitting a request to said first station for retransmitting of a data packet should it be received with more than a predetermined number of errors; (D) determining the error rate at said second radio station in received data packets; (E) transmitting a request to said first radio station from said second radio station to reduce the rate of data transmission if the error rate is greater than a predetermined amount over a predetermined time interval of data transmission; and (F) transmitting a request to said first radio station from said second radio station to change the channel frequency to said predetermined reserve channel frequency if said step of transmitting a request to said first radio station to reduce the rate of data trasmission does not reduce the error rate below said predetermined amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification