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|1. (WO2017031816) DATA TRANSMISSION METHOD, RELEVANT DEVICE AND SYSTEM|
|Applicants:||HUAWEI TECHNOLOGIES CO., LTD.
|Title:||DATA TRANSMISSION METHOD, RELEVANT DEVICE AND SYSTEM|
Provided are a data transmission method, device and system. The method comprises: a relay device receiving first downlink data sent from a gateway, and acquiring a first service identifier of the first downlink data; obtaining first PPP information corresponding to the first service identifier according to a first mapping relationship between the service identifier and data priority PPP information; and the relay device forwarding the first downlink data to a remote device according to the first PPP information. The PPP information about a downlink data packet can be acquired accurately and quickly, and the rate and accuracy rate of downlink data transmission are effectively improved.