Method and device for managing state of session according to position of terminal in wireless communication system
The present disclosure relates to a 5G or pre-5G communication system for supporting a data transmission rate higher than that of a 4G communication system such as LTE. According to one embodiment of the present invention, the present invention comprises the steps of: an access and mobility management function (AMF) of a 5G core network determining whether a terminal has moved to an area in which packet transmission/reception is possible, or an area in which packet transmission/reception is impossible; transmitting a message including information on the determination result to a session management function (SMF); and transmitting a response message including information associated with a change in the state of a session to the terminal. In addition, the present invention relates to a method and a device for blocking or allowing the transmission/reception of a packet transmission session (PDU session) according to the position of a terminal in a 5G system. In a 5G system, a local area data network service by which a packet session is valid only in a specific area will be supported, and a method is required for allowing the transmission of a packet of a session only in an area that can be divided into a cell or a tracking area. Additionally, in a 5G system, an allowed area in which the transmission/reception of a packet of a session according to each position of a terminal is allowed, and a non-allowed area in which same is not allowed are present, and thus packet transmission may be allowed or not according to area. In order to provide such service, the present invention provides a procedure whereby the state of a session is defined in a packet transmission non-allowed area, and a change in the state of the session occurs when moving from a packet transmission-allowed area to the non-allowed area.
1. A method performed by an access and mobility management function (AMF) in a communication system, the method comprising:
receiving, from a terminal, a registration request message;
transmitting, from the terminal, a registration accept message as a response to the registration request message, the registration accept message including information on a local area data network (LADN) service area, the LADN service area comprising at least one tracking area associated with the terminal;
determining whether the terminal is in the LADN service area; and
transmitting, to a session management function (SMF), information indicating whether the terminal is in the LADN service area,
wherein the information indicates the terminal is in the LADN service area, the information indicates the terminal is out of the LADN service area, or the information indicates it is not possible to determine whether the terminal is in the LADN service area.
2. The method of claim 1 ,
wherein a user plane connection for a protocol data unit (PDU) session associated with the terminal is deactivated, in case that the terminal is out of the LADN service area.
3. The method of claim 1 ,
wherein updated information on the LADN service area is transmitted to the terminal based on a registration procedure, in case that the information on the LADN service area is updated.
4. A method performed by a session management function (SMF) in a communication system, the method comprising:
receiving, from an access and mobility management function (AMF), information indicating whether a terminal is in a local area data network (LADN) service area, wherein the information indicates the terminal is in the LADN service area, the information indicates the terminal is out of the LADN service area, or the information indicates it is not possible to determine whether the terminal is in the LADN service area;
identifying whether the terminal is in the LADN service area based on the information; and
transmitting, to a user plane function (UPF), a control message indicating to discard downlink data associated with a protocol data unit (PDU) session corresponding to the LADN service area, in case that the terminal is out of the LADN service area.
5. The method of claim 4 , wherein the LADN service area comprises at least one tracking area associated with the terminal.
6. The method of claim 4 , wherein a user plane connection for the PDU session is deactivated, in case that the terminal is out of the LADN service area.
7. An access and mobility management function (AMF) in a communication system, the AMF comprising:
a transceiver; and
a controller configured to:
receive, from a terminal by the transceiver, a registration request message,
transmit, from the terminal by the transceiver, a registration accept message as a response to the registration request message, the registration accept message including information on a local area data network (LADN) service area, the LADN service area comprising at least one tracking area associated with the terminal,
determine whether the terminal is in the LADN service area, and
transmit, to a session management function (SMF) by the transceiver, information indicating whether the terminal is in the LADN service area,
wherein the information indicates the terminal is in the LADN service area, the information indicates the terminal is out of the LADN service area, or the information indicates it is not possible to determine whether the terminal is in the LADN service area.
8. The AMF of claim 7 ,
wherein a user plane connection for a protocol data unit (PDU) session associated with the terminal is deactivated, in case that the terminal is out of the LADN service area.
9. The AMF of claim 7 ,
wherein updated information on the LADN service area is transmitted to the terminal based on a registration procedure, in case that the information on the LADN service area is updated.
10. A session management function (SMF) in a communication system, the SMF comprising:
a transceiver; and
a controller configured to:
receive, from an access and mobility management function (AMF) by the transceiver, information indicating whether a terminal is in a local area data network (LADN) service area, wherein the information indicates the terminal is in the LADN service area, the information indicates the terminal is out of the LADN service area, or the information indicates it is not possible to determine whether the terminal is in the LADN service area,
identify whether the terminal is in the LADN service area based on the information, and
transmit, to a user plane function (UPF) by the transceiver, a control message indicating to discard downlink data associated with a protocol data unit (PDU) session corresponding to the LADN service area, in case that the terminal is out of the LADN service area.
11. The SMF of claim 10 , wherein the LADN service area comprises at least one tracking area associated with the terminal.
12. The SMF of claim 10 , wherein a user plane connection for the PDU session is deactivated in case that the terminal is out of the LADN service area.