Hybrid automatic repeat request method and system

A hybrid automatic repeat request system, configured for transmitting a piece of raw data, and comprising:

• at least one memory, comprising:
• an undefined HARQ process group, storing a plurality of undefined HARQ processes;
• and
• a plurality of HARQ process groups;
• and
• a coordinator, connected with the at least one memory, selecting a first HARQ process group from the plurality of HARQ process groups, assigning one of the plurality of undefined HARQ processes to the first HARQ process group to serve as a first HARQ process, and instructing the first HARQ process to transmit a first data packet, with the coordinator configured to receive a feedback signal in response to the first data packet, determining that the feedback signal corresponds to the first HARQ process according to the feedback signal and a time of receiving the feedback signal, determining whether the feedback signal indicates that the first data packet is decoded incorrectly, determining whether a last used HARQ process in the first HARQ process group is identical to the first HARQ process when the feedback signal indicates the first data packet is decoded incorrectly, instructing the first HARQ process to transmit the first data packet when the last used HARQ process in the first HARQ process group is different from the first HARQ process, and instructing the first HARQ process to transmit a second data packet or the first data packet when the last used HARQ process in the first HARQ process group is identical to the first HARQ process, wherein the first data packet is generated based on a whole of the piece of raw data, and the second data packet is generated based on a part of the piece of the raw data.