Method and a Transmitter/Receiver for Reduced Signaling in a Retransmission System Using Hybrid Automatic Repeat
AssigneeTelefonaktiebolaget LM Ericsson
InventorsMats Sagfors, Johan Torsner, Stefan Wager
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Abstract
The present invention relates to a transmitter and a receiver for a mobile communication system. The basic idea of the present invention is to target the number of HARQ transmissions that is required to be able to decode the transmitted data successfully and to only transmit HARQ feedback information if the decoding result differs from an expected result, wherein the expected result is based on the targeted number of required HARQ transmissions.
Claims35
A method for a receiver of communication system using Hybrid ARQ, HARQ, wherein the receiver is adapted to transmit HARQ feedback information on a first channel in response to a decoding result of data received on a second channel at the receiver transmitted from a transmitter, characterised in that the method comprises the step of:
- transmitting HARQ feedback information only if the decoding result differs from an expected result wherein the expected result is based on a targeted number of required HARQ transmissions, and the targeted number of required HARQ transmissions is known at the receiver and at the transmitter.
A method for a transmitter of communication system using Hybrid ARQ, wherein the transmitter is adapted to receive feedback information on a first channel from the receiver in response to a decoding result of data transmitted on a second channel from the transmitter to the receiver, characterised in that the method comprises:
- monitoring transmission of HARQ feedback information, and if no HARQ feedback information is detected from the sender,
- acting according to an expected result wherein the expected result is based on a targeted number of required Hybrid ARQ transmissions, and the targeted number of required Hybrid ARQ transmissions is known at the receiver and at the transmitter, and if HARQ feedback information is detected,
- acting according to the detected HARQ feedback information.
A receiver for a communication system using Hybrid ARQ, HARQ, wherein the receiver is adapted to transmit HARQ feedback information on a first channel in response to a decoding result of data received on a second channel at the receiver transmitted from a transmitter, characterised in that the receiver comprises means for transmitting HARQ feedback information only if the decoding result differs from an expected result wherein the expected result is based on a targeted number of required HARQ transmissions, and means for storing the targeted number of required HARQ transmissions.
A transmitter for communication system using Hybrid ARQ, wherein the transmitter is adapted to receive feedback information on a first channel from the receiver in response to a decoding result of data transmitted on a second channel from the transmitter to the receiver, characterised in that the transmitter comprises means for monitoring transmission of HARQ feedback information, means for acting according to an expected result wherein the expected result is based on a targeted number of required Hybrid ARQ transmissions if no HARQ feedback information is detected from the sender, means for storing the targeted number of required Hybrid ARQ transmissions, and means for acting according to the detected HARQ feedback information if HARQ feedback information is detected.
Dependencies are inferred from the claim text.