TECHNICAL FIELD

The present invention relates to a terminal apparatus, a control apparatus, a gateway, and a communication control method. This application claims priority based on JP 2016-132768 filed on Jul. 4, 2016 in Japan, the contents of which are incorporated herein in its entirety by reference.

BACKGROUND ART

The 3rd Generation Partnership Project (3GPP), which undertakes activities for standardizing recent mobile communication systems, discusses System Architecture Enhancement (SAE), which is the system architecture of the Long Term Evolution (LTE). The 3GPP is in the process of creating specifications for the Evolved Packet System (EPS) as a communication system which realizes an all-IP architecture. Note that a core network constituting EPS is called an Evolved Packet Core (EPC).

Moreover, in recent years, the 3GPP also discusses next generation communication technologies and system architectures for 5th Generation (5G) mobile communication systems, which are next generation mobile communication systems, and discusses Architecture for Next Generation System (NextGen) as a discussion about a next generation communication technology. In NextGen, technical problems for connecting various terminals to a cellular network are extracted, and solutions are standardized.

Requirements are, for example, optimization and diversification of communication procedures for supporting intermittent mobile communication services for terminals supporting various access networks, optimization of system architectures in line with the optimization and diversification of communication procedures, and the like.

CITATION LIST

Non Patent Literature

NPL 1: 3GPP TR 23.799 V0.5.0 (2016-05); 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Study on Architecture for Next Generation System; (Release 14)

SUMMARY OF INVENTION

Technical Problem

In NextGen, optimization of session management in mobile communication services between a terminal and a network apparatus is under discussion.

More specifically, discussions have been conducted for providing intermittent mobile communication services suitable for terminals and network apparatuses by diversifying access networks used in a session establishment procedure and a user data communication procedure.

However, there are no known means for establishing a session for a terminal supporting various access networks and a network apparatus, a means for realizing various user data communication means, and the like.

The present invention has been made in view of these circumstances, and an object of the present invention is to provide a means for session establishment, a communication control means for realizing various kinds of user data communication, and the like.

Solution to Problem

A terminal apparatus according to the present invention includes: a transmission and/or reception unit configured to receive a session establishment accept message including at least first identification information, from a core network or an access network via a Non-3GPP access in a first session establishment procedure; and a controller configured to establish a session supporting Access Traffic Splitting with the core network, based on the first session establishment procedure, wherein the first identification information is information indicating that the session supporting Access Traffic Splitting is established, and the session is a session in which communication through a first communication path via the Non-3GPP access is possible.

A communication control method of a terminal apparatus according to the present invention includes the steps of: receiving a session establishment accept message including at least first identification information, from a core network or an access network via a Non-3GPP access in a first session establishment procedure; and establishing a session supporting Access Traffic Splitting with the core network, based on the first session establishment procedure. The first identification information is information indicating that a session supporting Access Traffic Splitting is established. The session is a session in which communication through a first communication path via the Non-3GPP access is possible.

A control apparatus included in a core network according to the present invention includes: a transmission and/or reception unit configured to receive a session establishment request message including at least first identification information, from a terminal apparatus via a 3GPP access in a session establishment procedure, wherein the transmission and/or reception unit transmits a session establishment accept message including at least second identification information, to the terminal apparatus via a 3GPP access in the session establishment procedure, the first identification information is information indicating that establishment of a session supporting Access Traffic Splitting is requested, and the second identification information is information indicating that establishment of a session supporting Access Traffic Splitting is established.

A communication control method of a control apparatus included in a core network according to the present invention includes the steps of: receiving a session establishment request message including at least first identification information, from a terminal apparatus via the 3GPP access in a session establishment procedure; and transmitting a session establishment accept message including at least first identification information, to the terminal apparatus via the 3GPP access in the session establishment procedure, wherein the first identification information is information indicating that establishment of a session supporting Access Traffic Splitting is requested, and the second identification information is information indicating that establishment of the session supporting Access Traffic Splitting is established.

A gateway that connects an access network and a core network according to the present invention includes a transmission and/or reception unit configured to transmit a session establishment accept message including at least first identification information, to a terminal apparatus via a Non-3GPP access in a session establishment procedure, wherein the first identification information is information indicating that a session supporting Access Traffic Splitting is established.

A communication control method of a gateway for connecting an access network and a core network according to the present invention includes a step of transmitting a session establishment accept message including at least first identification information, to a terminal apparatus via a Non-3GPP access in a session establishment procedure, wherein the first identification information is information indicating that a session supporting Access Traffic Splitting is established.

Advantageous Effects of Invention

According to the present invention, a terminal is capable of connecting to a core network via multiple access networks simultaneously and also realizing various kinds of user data communication. Moreover, a core network is capable of accommodating a terminal apparatus connecting to various access networks and also providing a mobile communication service.

