A data transmission method in a non-transparent centralized scheduling multi-hop relay network, comprising,
- adding, by a Base Station (BS), an allocation reference Information Element (IE) in a MAP message when the BS sends data, wherein the allocation reference IE indicates Media Access Control Protocol Data Units (MAC PDUs) to be sent;
- obtaining, by a lower Relay Station (RS), the MAC PDUs according to the allocation reference IE in the MAP message after the lower RS receives the MAP message sent by the BS or forwarded by other RS;
- recombining, by the lower RS, the obtained MAC PDUs, and sending the recombined MAC PDUs downwardly in a bandwidth resource allocated by the BS;
- wherein, the allocation reference IE comprises a downlink allocation reference IE;
- and
- the downlink allocation reference IE is before or behind a Downlink-MAP (DL-MAP) IE in an RS Access MAP message;
- after an RS receives the downlink allocation reference IE, MAC PDUs indicated by the downlink allocation reference IE will be recombined, and then be sent to a terminal in a downlink bandwidth resource indicated by the DL-MAP IE;
- or, the downlink allocation reference IE is before or behind an Relay-Downlink-MAP (R-DL-MAP) IE in an Relay Station Relay Link (RS RLY) MAP message;
- after the RS receives the downlink allocation reference IE, the MAC PDUs indicated by the downlink allocation reference IE will be recombined, and then be sent to the lower RS in a downlink bandwidth resource indicated by the R-DL-MAP IE;
- wherein, the downlink allocation reference IE contains Num Connections and a Connection ID (CID):
- the Num-Connections is for indicating the number of connections from which the MAC PDUs to be sent come;
- and
- the CID is for indicating a connection identifier of a connection from which the MAC PDUs to be sent comes;
- wherein, the downlink allocation reference IE further contains Num Received Frames and Received Frame Index:
- the Num Received Frames is for indicating the number of data frames from which the MAC PDUs transmitted in the corresponding bandwidth and on the corresponding connections come;
- and
- the Received Frame Index is for indicating a frame number of a data frame from which the MAC PDUs transmitted in the corresponding bandwidth and on the corresponding connection comes.