Such a connection requires both Bluetooth and Wifi settings to be ON (notice clicking the AirPlay or AirDrop buttons in the Control Center on iOS devices turns both). Bluetooth is used for local discovery of other devices and WiFi direct is used for transmitting info between devices. (6) William Lloyd. Level 7. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.