The document discusses the logical elements in basic system architecture configuration. It describes the functions of key elements including: - User Equipment (UE) which provides the end user interface and identifies and authenticates the user. - eNodeB which acts as a layer 2 bridge and controls radio functions like mobility management and resource allocation. - Mobility Management Entity (MME) which handles authentication, security, mobility tracking, and managing subscription profiles. - Serving Gateway (S-GW) which manages tunnels and acts as the local mobility anchor during handovers.