ARQ RETRANSMISSION WITH REORDERING SCHEME EMPLOYING MULTIPLE REDUNDANCY VERSIONS AND RECEIVER/TRANSMITTER THEREFORE

摘要

PROBLEM TO BE SOLVED: To provide ARQ wherein deterioration of performance of a decoder which is to be caused by change of bit reliability is avoided.

SOLUTION: An ARQ retransmission in a communication system, wherein data packets comprising modulation symbols are retransmitted based on automatic repeat request and subsequently combined with previously received data packets, and the symbols of said data packets are modulated by a mapping unit employing a predetermined signal constellation. The retransmitted data packets are retransmitted in form of a selected one of a plurality of different redundancy versions. According to the invention, the bits to be transmitted are reordered prior to modulation over the retransmissions in accordance with the selected redundancy version.

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