System and method for performing emergency calls over WiFi when a cellular network is unavailable

摘要

A station that performs methods related to emergency calls. In one example, the station determines that a first connection to a cellular network is unavailable, the client station being associated with a home network having a home Public-Safety Answering Point (PSAP), the station disposed at a location outside the home network, the location having a remote PSAP. The station determines a second connection to a WiFi network is available, establishes the second connection to the WiFi network and performs an emergency call over the WiFi network. The emergency call being routed to the remote PSAP associated with the location. In another example, the station determines it is capable of performing an emergency call over a cellular network, receives a request to perform an emergency call, determines whether a circuit switched radio access technology (CS-RAT) is available and performs the emergency call over a WiFi network when the CS-RAT is unavailable.