At a minimum, the parameter that must be configured on the access point to allow a wireless client to connect is the SSID (Service Set Identifier). The SSID is the name of the wireless network and is essential for clients to discover and connect to the access point.
While other parameters such as AES (Advanced Encryption Standard for security), 802.11i (which pertains to security protocols), and PSK (Pre-Shared Key for encryption) may enhance security and network capability, the SSID is the fundamental requirement for the network to be accessible to wireless clients.