Abstract: Embodiments of the present invention provide a method for retransmission based on forward error correction. The method includes: when received source data packets loss occurs, judging whether all of the lost source data payloads can be decoded by using the received source data payloads and check data; if all of the lost source data payloads cannot be decoded, determining needed source data symbols for decoding all of the lost source data payloads by using the received source data payloads and the check data; and requesting for retransmitting the needed source data symbols.

Abstract: A method for implementing stream services is provided according to the embodiments of the present invention. The method includes: determining, by a server, a response message, in which the response message includes: at least one of an interval between a first data stream and a second data stream, latest data information of the second data stream, and rate change point information of the first data stream; and sending, by the server, the first data stream and the response message to a receiving end, so that the receiving end performs corresponding operation according to the response message. A communication system and a relevant device are further provided according to the embodiments of the present invention. The embodiments of the present invention can effectively improve data sending flexibility.