Patent ID: 9544908
Date: 2017-01-10
CPC Classifications: H04W

Claim:
1. A method for managing channel of a reception node included in a wireless sensor network, the method comprising: when a data frame is not received in at least one of a plurality of channels used in the wireless sensor network, counting the number of times of not receiving a data frame; when the number of times of not receiving a data frame from a first transmission node through a first channel among a plurality of channels is n, changing a state of the first channel into an unavailable state; and informing the first transmission node about the unavailable state of the first channel through a second channel among the plurality of channels; wherein the changing of the state of the first channel into the unavailable state comprises: changing the state of the first channel in a channel table stored in the reception node; and generating an unavailable channel bitmap through the channel table; and wherein the informing of the first transmission node about the unavailable state of the first channel comprises: after the state of the first channel is changed into the unavailable state, receiving a data frame from the first transmission node through the second channel; and informing the first transmission node about the unavailable state of the first channel by using an ACK frame with respect to the received data frame.