Patent ID: 8879466

Claim:
A transmission node, comprising: a preamble transmitter configured to transmit a preamble to a reception node using a first frequency band, to select an optimal frequency band among frequency bands provided for transmitting data from the transmission node to the reception node, and to transmit, with the preamble, information identifying the optimal frequency band to the reception node using the first frequency band; a preamble acknowledgement character (ACK) receiver configured to receive an ACK for the preamble from the reception node using the first frequency band; a data transmitter configured to transmit data to the reception node, using the optimal frequency band as a second frequency band different from the first frequency band, after the preamble acknowledgement character (ACK) receiver has received the ACK for the preamble from the reception node; and a data ACK receiver configured to receive, using the second frequency band, an ACK for the data from the reception node and to perform frequency-hopping from the second frequency band back to the first frequency band after receiving the ACK for the data from the reception node.