Channel quality measurement in data transmission using hybrid arq
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 (ACK) or negative (NAK) acknowledgement message from the receiver indicating that the data unit was transmitted successfully or not; and
if a negative acknowledgement message was received, transmitting said second code word,wherein at least one of said encoding parameter and said transmitting parameter is based on a measurement value indicating the quality for the first code word.
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Abstract
A hybrid ARQ technique for transmitting a data unit on a radio channel in a communication system to a receiver is provided, wherein after the 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. A measurement value indicating the current channel conditions is determined by counting the NAK messages and/or evaluating the encoding parameters. The measurement values may be the overall coding rate, the average number of retransmissions per data unit, or the average number of retransmissions per code word. The transmitter may include a NAK counter. The measurement may be used for adaptation purposes.
36 Citations
27 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 (ACK) or negative (NAK) acknowledgement message from the receiver indicating that the data unit was transmitted successfully or not; and if a negative acknowledgement message was received, transmitting said second code word, wherein at least one of said encoding parameter and said transmitting parameter is based on a measurement value indicating the quality for the first code word. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 22, 24, 25, 26, 27)
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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 for encoding the data unit into at least a first code word and a second code word using at least one encoding parameter; a transmission unit for transmitting said first code word using a transmitting parameter; a receiving unit for receiving a positive (ACK) or negative (NAK) acknowledgement message from the receiver indicating that the data unit is transmitted successfully or not; and an operating unit that operates the transmission unit for transmitting said second code word if a negative acknowledgement message was received, wherein at least one of said encoding parameter and said transmitting parameter is based on a measurement value indicating the quality for the first code word. - View Dependent Claims (17, 18, 19, 20, 21, 23)
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Specification