SYSTEM AND METHOD FOR DETERMINING ESTABLISHMENT CAUSES FOR EMERGENCY SESSIONS

A method for initiating a Packet Switched emergency call using a user equipment (UE), the UE including a plurality of protocol layers. The plurality of protocol layers includes an Internet Protocol (IP) Multimedia Subsystem (IMS) sublayer, a non-access stratum (NAS), layer and an access stratum, AS, layer. The method includes generating, at the UE, a first request comprising an indicator that indicates a request type. The UE determines a Radio Resource Control (RRC) establishment cause based on the request type, wherein the RRC establishment cause indicates that the UE is requesting an establishment of an RRC connection for an emergency call via a PS network. The UE generates an RRC CONNECTION REQUEST, the RRC CONNECTION REQUEST includes the RRC establishment cause.