Method and apparatus for transferring data according to an ARQ method
AssigneeSiemens Aktiengesellschaft
InventorsMartin Döttling, Jürgen Michel, Bernhard Raaf
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Abstract
The present invention relates to the use of an ARQ method, especially a hybrid-ARQ-method, in order to carry out a reliable packet orientation data transfer, preferably, using a mobile radio system. When requesting a transmission data packet for the bits of the retransmission data packet, a different rate adaptation model is used in comparison with the bits corresponding originally sent data packets. A particular advantage of the present method is that the bit-rate adaptation is carried out by dividing the bits which are to be transferred into a number of partial bit flows with respectively separate bit rate adaptation.
Claims15
A method for transferring data according to an ARQ method where data is transferred as data packets from a sender to a receiver, the method comprising the steps of:
- transferring a data packet from the sender to the receiver;
- transferring, after the transfer of the data packet and upon an appropriate request from the receiver, at least one retransmission data packet to the receiver from the sender;
- subjecting bits to be transferred in the respective data packet and retransmission data packet to bit rate adaptation before being transferred from the sender to the receiver;
- and
- using different bit rate adaptation patterns for the respective data packet and retransmission data packet, wherein the bit rate adaptation is carried out with aid of a bit rate adaptation algorithm which punctures or repeats the bits in the respective data packet and retransmission data packet depending on a value of an appropriate rate adaptation pattern parameter (eini) for bit rate adaptation of the bits in the retransmission data packet being changed with respect to the bit rate adaptation of the data packet so that after bit rate adaptation, bits with a same information origin are transferred from the sender to the receiver in different positions in the respective data packet and retransmission data packet.
An apparatus for transferring data according to an ARQ method where data is transferred as data packets from the apparatus to a receiver, comprising:
- parts for transmitting a data packet to the receiver;
- parts for transferring, after the transmission of the data packet and upon appropriate request from the receiver, at least one retransmission data packet to the receiver;
- and
- a bit rate adaptation device for subjecting bits to be transferred in the respective data packet and retransmission data packet to bit rate adaptation before being transferred to the receiver, wherein different bit rate adaptation patterns are used for the respective data packet and retransmission data packet, with the bit rate adaptation being carried out with aid of a bit rate adaptation algorithm which punctures or repeats the bits in the respective data packet and retransmission data packet depending on a value of an appropriate rate adaptation pattern parameter (eini) for bit rate adaptation of the bits in the re-transmission data packet being changed with respect to the bit rate adaptation of the data packet so that after bit rate adaptation, bits with a same information origin are transferred to the receiver in different positions in the respective data packet and retransmission data packet.
Dependencies are inferred from the claim text.