Patent ID: 9356999
Filing Date: 2016-05-31
CPC Classification: H04L,H04Q

Claim Text:
1. A system for changing a communication channel for guaranteed reliability communication, the system comprising: a transmitting peer dividing data into data frames to be transmitted and generating an unfinished frame list that is a list of the data frames produced through the division of the data to be transmitted; a receiving peer receiving the data frames transmitted from the transmitting peer and transmitting a response frame to the transmitting peer in response to the data frames received from the transmitting peer during a direct channel communication; and a relay server relaying a relay channel communication between the transmitting peer and the receiving peer, wherein the transmitting peer, when a preset time is reached, updates the unfinished frame list upon receiving the response frame from the receiving peer, wherein the transmitting peer immediately retransmits incompletely transmitted data frames included in the unfinished frame list to the receiving peer through the relay server when the communication channel is changed from the direct channel communication to the relay channel communication, wherein the updated unfinished frame list is a list of the data frames produced through the division of the data to be transmitted and the incompletely transmitted data frames, and wherein the incompletely transmitted data frames are data frames whose response frames have not been received by the transmitting peer after being transmitted from the transmitting peer to the receiving peer.