Hybrid ARQ technique for data transmission
First Claim
1. A hybrid ARQ method for transmitting a data unit on a radio channel, the method comprising:
- encoding the data unit into at least a first code word and a second code word using at least one encoding parameter;
transmitting said first code word using a transmitting parameter;
receiving a positive or negative acknowledgment message from a receiver indicating that the data unit was decoded successfully or not; and
if a negative acknowledgment message was received, transmitting said second code word, wherein;
at least one of said encoding parameter and said transmitting parameter for said second code word is based on a reception quality indicator for said data unit.
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Abstract
The invention provides a hybrid ARQ technique for transmitting a data unit on a radio channel in a communication system to a receiver. After encoding the data unit into a sequence of code words using an encoding parameter, a first code word is transmitted, and an ACK or NAK is received from the receiver. If a NAK is received, the next code word of the sequence is transmitted. According to the invention, a measurement value indicating the current channel conditions is determined by counting the NAK messages and/or evaluating the encoding parameters. Preferably the measurement values are the overall coding rate, the average number of retransmissions per data unit, and the average number of retransmissions per code word. In the preferred embodiment, the transmitter comprises a NAK counter. Besides the improved transmission measurement, the present invention provides using this measurement for adaptation purposes.
20 Citations
21 Claims
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1. A hybrid ARQ method for transmitting a data unit on a radio channel, the method comprising:
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encoding the data unit into at least a first code word and a second code word using at least one encoding parameter; transmitting said first code word using a transmitting parameter; receiving a positive or negative acknowledgment message from a receiver indicating that the data unit was decoded successfully or not; and if a negative acknowledgment message was received, transmitting said second code word, wherein; at least one of said encoding parameter and said transmitting parameter for said second code word is based on a reception quality indicator for said data unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A hybrid ARQ transmitter for transmitting a data unit on a radio channel, comprising:
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an encoder that encodes the data unit into at least a first code word and a second code word using at least one encoding parameter; a transmission section that transmits said first code word using a transmitting parameter; a receiving section that receives a positive or negative acknowledgment message from a receiver indicating that the data unit was decoded successfully or not; and an operating section that operates the transmission section to transmit said second code word if a negative acknowledgment message was received, wherein; at least one of said encoding parameter and said transmitting parameter for said second code word is based on a reception quality indicator for said data unit. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification