Fountain code-based cooperative multicast method

A fountain code-based cooperative multicast method for a cell of origin (COO) comprising a base station (BS) and some users that demand for a same multicast service, wherein said multicast service is used in a same frequency band, and said BS encodes data of said multicast service with a fountain code, comprising steps of:

• 1) continuously modulating a packet that is encoded by a fountain code in a carrier and transmitting outwards by said BS, receiving a signal by users with different channel conditions in a same frequency band, after receiving a feedback that all users completes receiving said data, ending transmitting said data by said BS;
• and
• 2):
• after decoding correctly and completing receiving said data by said user, transmitting said feedback by said user to said BS, for informing to said BS that said user has received said data, and then, starting to monitor a “help” signal of other users by said user;
• when receiving said “help” signal by said user that has decoded correctly, starting to coordinate through decoding forwarding by said user, and transmitting outwards a fountain code symbol that is same with said fountain code symbol of said BS by said user;
• and
• when receiving a feedback that all users coordinated encode correctly and complete receiving said data by said user that is coordinating, ending a cooperation by said user that is coordinating.