AP Reported channel utilization in Prime does not match reported channel utilization in Spectrum Expert

Hello
I have a fairly dense Wireless network with an Accesspoint per room. The 3502 models are connected to WiSM with Software 7.0.240.0 and are managed with Prime Infrastructure 2.2 (the issue was also in older PI versions).
PI reports on the 802.11b/g/n interface a channel utilization of 32% with a RX and TX utilization of 0% (no clients are connected to this AP). If I open this AP now in Spectrum Expert (thanks to CleanAir), I have a channel utilization of less than 5%, no interference power at all. Also the Swept Spectrometer is only showing signal with less than -85dbi (with a few very rare higher powered specks).
So which value is now correct, or do they show something different?
Thanks,
Patrick

This is very important to understand. I should actually do a blog post on the subjey, it comes up often. 
Think like a wifi radio. You can only do 3 things: send, receive, listen. And you can only do one of these at a time. While in listen mode, you hear other traffic on your channel within range. In send mode you tx data on the channel. In receive mode you Rx data on the channel. Based on these functions. You as an AP can determine how often the medium (channel) is busy or not. 
Lets go a bit deeper. Before a frame is sent a preamble is triggered to sync all clients on the channel. These client do not know yet if the frame is for them or not. Then the phy header comes telling clients how lomg/time the frame will take to send. Then the actual frame gets punched and all the clients receive it. The client brimg it up from the PMD layer to the data layer. Look at the Mac address and if its for them they process the frame. If it's not for them they drop it. But before they drop it they peek at the Nav timer in the duration / ID field and back off again. This time for the SIFS and ACK. This busy time calculates the number you are seeing .. Better ? 
I normally dont don't worry about channel utilization till 40% under load. If you are at 40 without load I bet you habe 1 PHY mandatory .. Do you ? 

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