US Patent 11343653 Session establishment to join a group communication

An access and mobility management function (AMF) receives from a wireless device, a first message indicating a request for a group communication session. The first message comprises a group communication session identifier. The AMF selects a session management function (SMF) for the group communication session of the wireless device. The AMF sends to a unified data management function (UDM), a second message to create a group context information. The second message comprises the group communication session identifier and an identifier of the SMF associated with the group communication session identifier.