ZigBee devices operate at 2.4 GHz frequency band according to IEEE 802.15.4 standard. Nevertheless, a small subset of the whole band is utilized with only selecting three channels: channel 15, 20 and 25. Because it is desired to have immunity against the interference caused by other devices. A target device can choose the best channel to utilize and one or more suitable channels may be selected. Target devices also scan the channels and learn other ZigBee RF4CE PANs. Then, they determine their unique network identifier accordingly. Channel agility is supported for the three available channels. Control device sends data via all three channels and records the channel that a response comes after the target changes its operating channel.
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