| 摘要 |
The invention relates to a method for transmitting packet data units (PDU) from a eNodeB via a relay node to a mobile node. The relay node determines whether each PDU from the eNB is appropriate for the current channel conditions to the MN. Consequently, only if PDU is appropriate for the channel quality, same is transmitted. If not, eNB re-transmits the PDU according to current channel conditions. Moreover, the MN when failing to decode a PDU correctly, requests the re-transmission of said PDU from the eNB via a status report. The relay node intercepts said status report and learns which PDU(s) are to be re-transmitted. The relay node determines whether the unsuccessful PDUs are still available in its transport buffer or not andonly carries out the re-transmission if the PDU is in its buffer. If not, the re-transmission of said unsuccessful PDU is performed by the eNB.
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