Patent ID: 6975641
Filing Date: 2005-12-13
Classification: H04L,H04Q,H04W

Abstract:
1. A data transmission method for communication between first and second transmission devices transmitting/receiving a data frame including a transmission timer value indicating a total frame time of data frames subsequent thereto by using a single transmission path, comprising the steps of: sequentially transmitting n-data-frames (where n is an arbitrary natural number) each said frame including the transmission timer value set to indicate (n-k) frame time (where k is an arbitrary natural number showing sequential order of transmission) from said first transmission device; detecting, at said second transmission device that has received one or more of the data frames each said frame including said transmission timer value, the transmission timer value included in an error-free data frame among the received data frames; managing, at said second transmission device, an elapse of the total frame time of the subsequent data frames by using the detected transmission timer value and managing an elapse of a time period by using a predetermined initial value when no transmission timer value is detected, for confirming that said transmission path is available; and transmitting one or more data frames in sequence from said second transmission device when said transmission path is confirmed being available.