Abstract: The method of transmitting data in real time with low power via a wireless line in which channel status is searched to prevent data loss by transmitting and receiving retransmission a packet every time when there is an interference, and to minimize power consumption necessary for transmission and reception by transmitting and receiving the retransmission packet at a specific period when there is no interference. The method includes: transmitting real time packet data containing reply requesting information from a master to a slave; determining channel status by analyzing whether the master receives the reply packet and reply information; and adjusting the number of times of requesting the reply packet by selectively recording the reply requesting information contained in a control information field of the real time packet data according to the determined channel status. Power consumption due to the transmission and reception of the reply packet can then be reduced.

Abstract: The invention relates to a real-time data transmission method, and more particularly to a real-time data transmission method using a Frequency Hopping Spread Spectrum (FHSS) in which a frequency channel, which causes no interference in real-time data transmission, is found to transmit data. In this method, when data is transmitted in real time through a setting channel, a channel in good state is acquired after a setting time through comparison with a test channel and, to prepare for interference that may occur during data transmission, the setting channel is previously changed to another channel before interference occurs, so that real-time data is transmitted while maintaining the continuity of data transmission, thereby minimizing data loss.

Abstract: A short distance wireless data transmission system and method which are capable of minimizing data loss are disclosed. The short distance wireless data transmission system can monitor variation amount of memory data, which is buffered in the master side when data transmission errors occur, can perform re-transmission of data having transmission errors, and can perform a change toward new replacement channel without interference if variation amount of memory data, which is buffered therein, exceeds a predetermined reference value to re-transmit from data in which the first transmission error occurs thereto, such that real time data cannot be lost, although a channel change is generated by successive channel interference.

Abstract: Disclosed is a method and device for locally transmitting digital wireless data through a searched channel with no interference. Firstly, data is transmitted and received through a setup channel. A channel having a different frequency from the setup channel is set as a temporary replacement channel. Data is transmitted and received through the temporary replacement channel, and it is checked whether there is channel interference. When there is no channel interference, the temporary replacement channel information is stored, and data is transmitted and received after returning to the setup channel. When it is detected that channel interference continuously occurs while transmitting and receiving data through the setup channel, data is transmitted and received after changing the stored replacement channel to a new setup channel.