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IEEE 802.15.4 superframe structure

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Tamas888

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Hello, I need a little comment for this picture. I don’t know exactly what this is. I am studying MAC protocols now for body area networks.
Why are there Inactive Period? And do it mean a period where no one use the channel? Why?
I think the beacons means the synchronisation.. Do these beacons equal to messages?
I have not found any detailed description on the internet.. Of course there are many study but I can’t imagine the real situation..
During the contention access period the users can to try to use the channel and I think the channel is allocated during the GTS... Am I right?
Thanks any comment!!
Tamas
 

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