Adding to the challenge, “We expect these people to be carrying and using multiple wireless devices,” says Frohwerk. “In Vancouver, we only had to provision one device per user. This means that we really have to have the capability to support up to 120,000 users on the Sochi Wi-Fi network, without issues or interruptions.”

via Avaya builds massive Wi-Fi net for 2014 Winter Olympics – Network World.

It’s interesting that they have to provision devices to users.  Is this done manually?  Here’s more….

In Sochi, Avaya’s Wi-Fi network will be split into five virtual SSID-based networks. There will be one network for the athletes, two for media (one free, one paid), one for Olympics staff, and one for dignitaries.

Each group will have its own access password, and extra layers of password protection will be added where needed. The Wi-Fi traffic will be distributed using about 2,000 802.11n access points across the Olympics Game sites; including inside the stands for the first time.

Each SSID will need its own range of frequencies so having 5 seems like it would present problems trying to figure out where to place access points so their radio transmissions don’t step on each other.  Also there doesn’t seem to be any provisions made for their customers, the people paying to attend these events.