Method for Transmitting File Based on Multiplex Forwarder

A method for transmitting a file based on a multiplex forwarder using a session join time interval, comprising the steps of:

• a) receiving msg_join_request, which is a session join request message, from a member, creating an entry for the member and joining the member in a session;
• b) receiving msg_first_packet, which is a packet reception message including a sequence number of a first packet, from the member;
• c) receiving a message for notifying the first packet reception from the member, setting up a range of a gift, i.e., a packet sequence number, which is a data transmission range of another member joining right before the member, based on the sequence number of the first packet, and transmitting msg_present, which is a message including a packet sequence number range, to the member joining right before the member;
• and
• d) receiving msg_candidates_request, which is a forwarder candidate list request message, from the member and transmitting the forwarder candidate list to the member.