Network Discovery and Selection

The selection of the access network and the management of the traffic between Long‐Term Evolution (LTE) access and Wireless Fidelity (Wi‐Fi) access are supported by the Access Network Discovery and Selection Function (ANDSF) server. The information provided by the ANDSF server has a tree structure of management objects (MO) that use an extensible markup language (XML). The Inter‐System Mobility Policy (ISMP) provides the mobile with the rules for routing Internet Protocol (IP) packets over LTE or Wi‐Fi interfaces. Before associating with an access point, the mobile requires informationon the services provided by the Wi‐Fi access networks, from Generic Advertisement Service (GAS) frames that are action‐type management frames. The Institute of Electrical and Electronics Engineers (IEEE) has defined a subset of access network query protocol (ANQP) information elements. The Wi‐Fi Alliance (WFA) organization has completed the list as part of passpoint certification based on hotspot 2.0 features.