Patent ID: 6894603

Claim:
A packet communication method of a powerline communication system in which first and second nodes out of all nodes 1 through n that are in connection with a powerline are performing a packet communication, the method comprising the steps of: (a) performing a packet communication with the first node by letting a channel acquired by either the third or fourth node whose virtual signal resulting from the random time delay value is shorter in case third and fourth nodes make an attempt to acquire a channel for a packet communication with the first node, if a signal is not detected in the powerline when a signal detection result of the powerline is checked according to a channel signal resulting from a signal detection of the powerline and a virtual signal resulting from the delay of the channel signal as much as a random time delay value within an initial time delay value range; (b) performing a packet communication with the first node by letting a channel acquired by either the node that does not acquire a channel or the fifth node, whose virtual signal delayed as much as the random time delay value is shorter in case a node, which has not acquire a channel in step (a), and an additional fifth node simultaneously make an attempt for a packet communication with the first node, according to a channel signal resulting from the signal detection of a powerline after setting a random time delay value of a predetermined range when the node that does not acquire a channel sets a time delay value range at a predetermined one, smaller than a maximum of a prior time delay value and a virtual signal resulting from the delay of the channel signal as much as the set random time delay value, and according to a channel signal resulting from the signal detection of the powerline in the fifth node and a virtual signal resulting from the delay of the channel signal as much as the random time delay value of the initial time delay value range, if a signal is not detected in the powerline when a signal detection result of the powerline is checked; (c) performing a packet communication with the first node by acquiring a channel if a signal is not detected in the powerline as a result of the signal detection of the powerline according to a channel signal resulting from the signal detection of a powerline after setting a random time delay value of a predetermined range when the node that does not acquire a channel at step (b) sets a time delay value range at a predetermined one, smaller than a maximum of a prior time delay value, and a virtual signal resulting from the delay of the channel signal as much as the set random time delay value.