| 摘要 |
The present invention is related to an error handling in transmission of information units in radio links and in particular it is related to an error handling using automatic repeat request (ARQ) and transmission of information units in mobile communication. Type II hybrid ARQ schemes introduce a set of consequent code ratings. Information is first sent with high code rating, i.e. little redundancy, and if one erroneous unit is requested to be retransmitted, additional code bits will be added for the following transmission to enhance the reliability of the retransmission. The fine code rating granularity results in a higher link throughput but in higher normalised packet delays as well. To reduce the access delay of packet data services, the present invention uses different code ratings according to type II hybrid ARQ for different erroneous information units selected from a formatted block of information units, that have been transmitted, are selected and the set of selected erroneous information units is divided into a set of n subsets encoded with n code ratings. Advantageously, the retransmission of portions of the formatted block with different code ratings enhances the reliability of the retransmission.
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