The Wi-Fi radio inside the user device automatically roams from one access point to another as needed to provide seamless connectivity. In the past, I’ve experienced issues with roaming, so I decided to perform some testing to get an inside view of what’s really happening.
So if you use a notebook to measure overlap, i OS devices will have different cell boundaries than you expect.
This is when stations check for access points (APs) that support the current ESSID.
There will be about 15 to 20 Wireless Barcode Scanner. I read there is no need for a Zone Director for Layer 2 Roaming because this is implemented in the 802.11 Protocoll. Having a Zone Director allows for the cached client session credentials to be shared between APs and allows for more seamless roaming, especially for Vo IP and Scanner usage. Without a Zone Director, the scanner is dropping from one AP, and performing an entire new connection to the next AP, including another DHCP request, and will result in a few lost packets by the scanner telnet application.
If these dropped packets are enough to freeze the application or cause it to lose session with the server will have to be evaluated, but for best results, the ZD is a valuable piece of the solution.
For example, you might design 5 GHz cells that have a -67 d Bm overlap.
In this case, the i OS client keeps its connection to the BSSID longer than you expect. If the BSSID's RSSI is greater than -65 d Bm, the i OS client prefers a 5 GHz network.
■ The VLR receives instructions as a consequence of an HLR or a VLR restoration. The VLR also initiates the update location procedure periodically to ensure that mobiles are not detached accidentally from the system.
The map update procedure is used by the VPLMN VLR to update the location information stored in the HPLMN HLR.
Good reply Michael, For the session credentials to be shared between access points, does 802.11r with 802.11k support needs to be enabled on the zonedirector or will enabling these features trigger an even faster (more seamless) roaming (for client devices that support these features) because of storing the PMKs at the zonedirector (PSK & 802.1x support) and also clients requesting neigboring reports from the access points.