First , I would get the Radio MAC addresses and channels of all your access points. You can use either a pc or a handheld to determine the signal level. Setup a large ping to you gateway, then armed with a map of the yards, you can walk around checking signal levels and recording them on the map. You should be able to determine a problem area by switching between screens, while looking at the signal level and the amount of lost packets.
There are other factors that come into play, like how high the aps are mounted, the type of antennas, how high products are stacked, the type of product, and if wireless cameras are being used.
If you are using these in a container yard, you will notice signal differences between the container stacks, especially as you get farther from the antenna. The stacks of containers will "shadow" the signal like a barrier wall. The lower your antennas the more this will happen since the signal can't penetrate the containers or materials that are stacked higher than the antennas or client devices..
Hi.. thanks for your valuable outputs. I tried checking the signal strength. It shows me variable at all times. it goes upto 60 and then to -70db. The height of our warehouse is 11.5 sqmt. I tried to do the third party configuration but its the same. I am using 4 VNA screens and 7 RF (Handheld).
you can check your acces points with free software like
you can see the radio MAC address and level radio.
but if you have to much trouble call PSION an a technician can make wifi coverage analysis.
(it can make a Wi-Fi spectrum analysis or coverage analysis....)
Height of the warehouse is one aspect, but the racking and inventory play a bigger part. That is the "clutter" that blocks or diminishes the radio signal. The higher the density of stock, especially if your inventory is material absobs or blocks radio waves. You will get fluctuations in signal strength as you walk the aisles, but you should not get it standing still. That would indicate roaming or network issues where a radio is not performing consistantly. The other thing I see is over saturation of Access Points for the area being covered. Our typical rule of thumb is one AP for every 2950 sq. mt. 8 AP's in an area of 4750 square meters is only 594 sq mt per AP. At that concentration you would need the radio power turned down to about 30% so as not to have huge overlaps in coverage where a client terminal holds on to a link with an AP far way where it has trouble transmitting back through all the inventory at ground level. Even your larger 9500 sq mt with 12 AP's is 792 sq mt per AP, way too small an area for full power. I run into this all the time when people use Cisco AP's at full power. They put out 100mw where the client terminal is only 40mw, so the signal strength disparity causes terminals to stay linked to a distant AP because the RSSI is high. But it can't tranmit back to that AP because it's power won't get back to the AP through the inventory. The 9160 has an output power of 80mw, so you are still higher than the client device and balancing the power is critical to system operation.