Can you go into more depth about this, and how to accomplish it? I have 3 different wireless routers, currently set up in the same way as stusser with different SSIDs, but I've gotten tired of switching between them manually all the time. My house is very vertical, so I have one per floor, all connected together via Cat 5e ethernet, and two of my routers' ethernet ports (and all my switches) are gigabit capable. Here's the details about my setup:
In the basement, I use the crappy DSL modem/router/wifi that I got from my ISP. It's a Technicolor TG582n, which means it doesn't support 802.11ac, nor the 5 Ghz band, nor Gigabit ethernet. I manually forced it to be Channel 1 in the 802.11b/g/n 2.4GHz band (the only control over the wifi signal I have), and gave it the same SSID and security settings (WPA2 PSK - AES) as the two other routers. The Technicolor TG582 is also handling DHCP duties for the whole network. It's plugged into a Gigabit Ethernet Switch, which in turn links to the routers upstairs, and wired devices in the basement.
On the main floor, I have a TP-Link Archer C7 v2, It has a bunch of advanced wireless settings, most of which I don't understand what to do with. I forced it to be on Channel 6 in the 802.11 b/g/n mixed mode 2.4GHz band, and it's set to Auto choose the channel for 5GHz. I also set the 2.4GHz band channel width to be 20 MHz, instead of the default 40, since I read that cooperates better with Bluetooth devices.
On the upper floor, I have a Netgear R6250, which is manually forced to be on Channel 11 in the 2.4 GHz band and Channel 153 in the 5 GHz band (802.11 a/n/ac mixed).
Is there anything else I need to do to assure myself of proper roaming? I found my iPhone connects to the basement router when I'd come in to the garage, and it doesn't seem to want to let go, which is really messing up my Wi-Fi Calling feature when I'm upstairs.