KR20180106780A - Method for updating pdu session connection between terminal and network by the network - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5G communication system with IoT technology to support a higher data rate after a 4G system, and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, security and safety-related service, etc.) based on 5G communication technology and IoT-related technology. The present invention discloses a method for managing a data transmission connection of a PDU session to transmit data between a terminal and a network according to the determination of the network in a mobile communication system. A control signal processing method includes the steps of: receiving a first control signal; processing the received first control signal; and transmitting a second control signal to the network. Accordingly, the present invention can efficiently use a network resource.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for updating PDU session connection between a terminal and a network by a network,

The present invention relates to a method of managing a data transmission connection of a PDU session for transmitting data between a terminal and a network according to a determination of a network in a mobile communication system.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G network) communication system or after a LTE system (Post LTE). To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed. In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed. In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

On the other hand, the Internet is evolving into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects in a human-centered connection network where humans generate and consume information. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired / wireless communication, network infrastructure, service interface technology and security technology are required. In recent years, sensor network, machine to machine , M2M), and MTC (Machine Type Communication). In the IoT environment, an intelligent IT (Internet Technology) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, and advanced medical service through fusion of existing information technology . ≪ / RTI >

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, a machine to machine (M2M), and a machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antennas It is. The application of the cloud RAN as the big data processing technology described above is an example of the convergence of 5G technology and IoT technology.

2. Description of the Related Art [0002] Recent developments in LTE (Long Term Evolution) and LTE-Advanced technology have been actively researched, and in particular, in a mobile communication system, data is transmitted between a terminal and a network There is a need for a method and apparatus for managing the data transfer connection of a PDU session.

It is an object of the present invention to provide a user plane network function for data transmission and reception of a PDU session for data transmission with a terminal in a mobile communication system, a session management network function for controlling a user plane network function, The user plane network function associated with the PDU session for data transmission of the UE and the connection state between the base station device and the PDU session state of the UE in accordance with the determination of the User Plane network function or the session management network function, And how to manage it.

Still another object of the present invention is to define a network slice composed of network resources capable of satisfying service-specific requirements in 5G mobile communication. The mobile service provider can define a specialized network slice for each operator. SUMMARY OF THE INVENTION The present invention provides a method for providing a network slice specific to each service provider in a roaming network other than a service provider in a 5G mobile communication system.

According to an aspect of the present invention, there is provided a method of processing a control signal in a wireless communication system, the method comprising: receiving a first control signal transmitted from a network; Processing the received first control signal; And transmitting the second control signal generated based on the process to the network.

According to an embodiment of the present invention, by providing a method of transmitting signaling of a terminal between devices in a mobile communication service provider network, the mobile communication service provider being responsible for a network function, And it is possible to efficiently operate the network resources.

According to another embodiment of the present invention, slice information between mobile communication providers establishing a roaming agreement in a wireless communication system can be managed. Also, the terminal can acquire slice information that can be used in the roaming network, and can provide information on how to manage and use the slice information of the roaming network.

1A shows an example of a network structure of a mobile communication system to which the present invention is applied.
FIG. 1B shows a procedure for setting a state of a PDU Session to IDLE and releasing a User Plane Connection to a terminal and a paging station according to a determination in an SM Network Function according to an embodiment of the present invention.
FIG. 1C shows a procedure for setting a state of a PDU Session to IDLE and releasing a User Plane Connection to a terminal and a paging station according to a determination in the MM Network Function according to an embodiment of the present invention.
FIG. 1D illustrates a procedure for managing PDU connection settings in a terminal for data processing of a terminal according to an embodiment of the present invention.
2A is a diagram illustrating a network structure according to an embodiment of the present invention.
FIG. 2B is a diagram illustrating information stored in a terminal and an HPLMN according to an embodiment of the present invention.
2C is a diagram illustrating a terminal registration process in a roaming network according to an embodiment of the present invention.
FIG. 2D is a flowchart illustrating a terminal operation according to an exemplary embodiment of the present invention and information changes stored in the terminal.
FIG. 2E is a diagram showing an operational flow of the VPLMN NF according to an embodiment of the present invention.
FIG. 2F is a diagram illustrating an operational flow of the HPLMN NF according to an embodiment of the present invention.
FIG. 2G is a diagram illustrating a terminal registration process in the roaming network according to an embodiment of the present invention.
2H is a diagram illustrating a session establishment process in a roaming network according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

≪ Embodiment 1 >

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

A term used for identifying a connection node used in the following description, a term referring to network entities, a term referring to messages, a term indicating an interface between network objects, a term indicating various identification information Etc. are illustrated for convenience of explanation. Therefore, the present invention is not limited to the following terms, and other terms referring to objects having equivalent technical meanings can be used.

For convenience of explanation, the present invention uses terms and names defined in 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited by the above-mentioned terms and names, and can be equally applied to systems conforming to other standards.

1A shows an example of a network structure of a mobile communication system to which the present invention is applied. 1A, the mobile communication system includes a mobile station 1a-01, a base station 1a-02, a mobility management function 1a-03 and a session management function 1a-04 (1a-12) and UP (user plane) function 1a-05 (1a-07) including the subscriber data 1a-10 and NF Repository 1a-11. In the mobile communication system, a group of devices including the control functions and a user plane function except for the UE and the bearer station is referred to as a CN (Core Network). The mobile communication system receives service data related to an external service through a DN (Data Network) 1a-08 (1a-09) for interworking with an external application.

 The base station 1a-02 provides a wireless connection to the terminals. That is, the base station 1a-02 schedules and allocates radio resources to service traffic of users, thereby supporting connection between the UEs and a core network (CN).

The MM 1a-03 performs a mobility management function of the terminal, and communicates with the base station to transmit a control signal related to mobility management to the terminal.

The SM 1a-04 (1a-06) manages a session through which the terminal can perform a service through the data network and contacts the UP function 1a-05 (1a-07) And manages the transmission of service data.

The UP function 1a-05 (1a-07) processes a packet arriving from the base station 1a-02 or a packet to be transmitted to the base station 1a-02.

The connection established by the Control Functions 1a-12 to exchange control signals with the UE 1a-01 is referred to as an NG1 connection.

A connection established by the Control Functions 1a-12 to exchange control signals with the Node Bs 1a-02 is referred to as an NG2 connection. Packets exchanged between the terminal 1a-01 and the Control Functions 1a-12 through the NG1 connection are transmitted between the terminal 1a-01 and the base station 1a-02 through a wireless connection, And is transmitted between the base station and the Control Functions through the NG2 connection.

The connection between the UP function (1a-05) 1a-07 and the base station 1a-02 for exchanging packets with the terminal is referred to as NG3 connection.

The mobile communication system includes a plurality of data networks 1a-09 and a plurality of UP functions 1a -08 so that the terminal 1a-01 can perform various types of external services. (1a-07). The data network 1a-08 and the data network 1a-09 are connected to the terminal 1a-01 through the UP function 1a-05 and the UP function 1a- Can be exchanged.

At this time, the control of the UP function 1a-05 for connection between the UP function 1a-05 and the terminal 1a-01 and the base station 1a-02 is performed by the SM function 1a-04 . The control of the UP function (1a-07) for connection between the UP function (1a-07) and the terminal 1a-01 and the base station 1a-02 is performed by another SM function 1a- ). ≪ / RTI > At this time, a connection for exchanging control signals between the terminal 1a-01 and the SM 1a-04 and the SM 1a-06 is established between the MM 1a-03 and the terminal 1a- Connection. The connection between the base station 1a-02 and the SM 1a-04 and between the MM 1a-03 and the base station 1a-02 is controlled by an NG2 connection between the MM 1a- Lt; / RTI >

At this time, the MM does not process a signaling message for establishing a PDU connection with the SM 1a-04 (1a-06) received from the terminal 1a-01, 0.0 > 1a-06. ≪ / RTI > At this time, the MM selects from the SM 1a-04 or the SM 1a-06 an appropriate SM function for processing PDU connection setup received from the terminal 1a-01, and transmits the PDU connection setup message do.

FIG. 1B shows a procedure for setting a state of a PDU Session to IDLE and releasing a User Plane Connection to a terminal and a paging station according to a determination in an SM Network Function according to an embodiment of the present invention.

The SM Network Function (hereinafter referred to as SM) 1b-04 may decide to change the state of the PDU Session to Idle when data transmission to the MS is expected to be absent for the time being through the PDU Session. At this time, a condition for determining that the state of the PDU Session is required to be changed to Idle is a case where data transmission / reception through the PDU Session in the UP (1b-05) does not exist for a predetermined period, However, when it is determined that the terminal is out of the service range of the PDU Session, or when the terminal is out of the area where data service can be received in the mobile communication system, , Or if the SM determines that data transmission / reception through the PDU Session is temporarily difficult due to reasons And the like.

When the SM 1b-04 determines that it is necessary to change the PDU Session to the Idle state, the SM 1b-04 transmits the UP (1b-05) configured to transmit data related to the PDU session to the UP (1b- And transmits an N3 path release request (1b-07) to release the connection between the base stations 1b and 02. At this time, the N3 path release request may include information indicating the PDU Session such as the ID of the PDU Session.

When the SM 1b-04 transmits the N3 path release request to the UP (1b-05), when the UP (1b-05) receives data related to the PDU Session from the outside, the UP -05) transmits to the SM (1b-04) a Downlink Data Notification informing that it has received the data, or a Packet associated with the PDU session indicating whether to discard the data until there is no other request Discard related information can be transmitted.

Upon receiving the N3 path release request (1b-07), the UP (1b-05) releases the connection between the UP (1b-05) and the base station (1b-02) ) To the N3 path release response (1b-08). At this time, the UP (1b-05) can remove the information necessary for managing the PDU session while releasing the connection related to the PDU session.

When the UP (1b-05) receives the Packet Discard related information associated with the PDU session when receiving the N3 path release request (1b-07) from the SM (1b-04) It is determined whether to discard data received from the outside in accordance with the PDU Session, or to transmit a Downlink Data Notification informing the SM 1b-04 that the data is received, and processes the data .

After receiving the N3 path release response (1b-08) from the UP (1b-05), the SM 1b-04 sends the PDU session to the MM 1b- It may transmit an N3 path release request for releasing the connection with the UP (1b-05) (1b-09).

When the MM 1b-03 receives the N3 path release request from the SM 1b-04, the MM 1b-03 sends the N3 path release request to the base station 1b-02 to which the terminal 1b-01 is connected And transmits an N3 path release request to request to release the connection related to the PDU session. (1b-10)

Upon receiving the N3 path release request from the MM 1b-03, the base station 1b-02 cancels the connection with the UP (1b-05) associated with the PDU Session, releases the radio resource interval, PDU session can be removed.

At this time, the base station 1b-02 can transmit an RRC configuration reconfiguration to the terminal 1b-01 to inform that the radio resource interval associated with the PDU session is released.

Upon receiving the RRC Connection Reconfiguration notifying that the radio resources related to the PDU session are released from the Node B 1b-02, the UE 1b-01 recognizes that the connection related to the PDU session is not maintained , And manages the state of the PDU session by Idle. When the PDU Session is managed in the Idle state, when the UE desires to transmit data through the PDU Session, it transmits data to the Node B 1b-02 and the MM 1b-03 via the PDU Session The connection between the base station 1b-02 and the UP capable of transmitting and receiving data through the PDU session is requested to be reset.

The BS 1b-02 can release the connection for the PDU session and send the N3 path release response to the MM 1b-03 to inform the connection is released. (1b-13)

After receiving the N3 path release response from the base station 1b-02, the MM 1b-03 transmits the connection of the UP (1b-05) to the base station 1b-02 for the PDU session to the SM. N3 path release response indicating that the node has been released (1b-14).

In another embodiment of the present invention, the SM 1b-04 sends the N3 path release (1b-03) to the MM 1b-03 before requesting the N3 path release request (1b-07) request to transmit the N3 path release response (1b-14) from the MM in response to the PDU session request to release the connection related to the PDU session in the base station 1b-02 related to the PDU session It may request the N3 path release request (1b-07) to be transmitted from the UP (1b-05).

FIG. 1C shows a procedure for setting a state of a PDU Session to IDLE and releasing a User Plane Connection to a terminal and a paging station according to a determination in the MM Network Function according to an embodiment of the present invention.

The MM 1c-03 may temporarily suspend the service with the terminal 1c-01 through the PDU Session including the case where the terminal 1c-01 is recognized as being out of the service range of the PDU Session, If it is determined that it is impossible, it can be determined to change the state of the PDU Session to Idle. (1c-06)

The MM may decide to change the PDU Session to the Idle state and send an N3 path release request (1c-07) requesting the SM to disconnect the PDU Session. When the MM enters the area where the data service is not available, such as when the N3 path release request is transmitted to the SM, or when the MM is out of the service range of the PDU session of the terminal 1c-01, The PDU session can not be made available.

When the SM receives the N3 path release request, the SM establishes a connection between the UP (1c-05) and the base station (1c-02) set up for transmitting data associated with the PDU session to the UP (1c-05) N3 path release request (1c-08) is sent to release. At this time, the N3 path release request may include information indicating the PDU Session such as the ID of the PDU Session.

When the SM receives the data associated with the PDU Session from the UP in the UP (1b-05) from the N3 path release request (1c-08) transmitted to the UP (1c-05) ) To the SM 1b-04 to transmit a Downlink Data Notification indicating that the data has been received, or to discard the data until there is no other request, Information can be transmitted. At this time, the Packet Discard related information associated with the PDU session is received when the SM receives the N3 path release request from the MM or when it is determined that the PDU session can not be serviced, or the policy of the provider set in the SM And may be set according to various conditions including.

Upon receiving the N3 path release request, the UP (1c-05) releases the connection between the UP (1c-05) and the BS 1c-02 and informs the SM (1c-04) response is transmitted (1c-09). At this time, the UP (1c-05) can remove the information necessary for managing the PDU session while releasing the connection related to the PDU session.

Upon receiving the Packet Discard related information associated with the PDU session, the UP (1c-05) receives the N3 path release request from the SM (1c-04) PDU Session to determine whether to discard the data received from the outside or to transmit the Downlink Data Notification informing the SM 1b-04 that the data is received, and processes the data.

After receiving the N3 path release response (1c-08) from the UP (1c-05), the SM 1c-04 informs the MM 1c-03 that the UP (1c-05) It may send an N3 path release response indicating that the associated connection has been released. (1c-10)

After receiving the N3 path release response from the SM 1c-04, the MM 1c-03 transmits a connection related to the PDU session to the base station 1c-02 to which the terminal 1c- (1c-11) < / RTI >

Upon receiving the N3 path release request from the MM 1c-03, the BS 1c-02 releases the connection with the UP (1c-05) associated with the PDU Session, releases the radio resource section, PDU session can be removed.

At this time, the BS 1c-02 can transmit an RRC configuration reconfiguration to the MS 1c-01 to notify that the radio resource interval associated with the PDU session is released (1c-12).

Upon receiving the RRC Connection Reconfiguration notifying that the radio resources related to the PDU session are released from the Node B 1c-01, the UE 1c-01 recognizes that the connection with respect to the PDU session is not maintained , And manages the state of the PDU session by Idle. When the PDU Session is managed in the Idle state, when the UE desires to transmit data through the PDU Session, it transmits data to the Node B 1c-02 and the MM 1c-03 via the PDU Session It is necessary to reset the connection of the wireless zone and to reset the connection between the base station 1c-02 and the UP capable of transmitting and receiving data through the PDU session.

The base station 1c-02 can release the connection for the PDU session and transmit the N3 path release response to the MM 1c-03 to notify that the connection is released.

After receiving the N3 path release response from the base station 1c-02, the MM 1c-03 transmits the connection of the UP (1c-05) to the base station 1c-02 for the PDU session to the SM. (1c-15) can be transmitted.

In another embodiment of the present invention, the MM 1c-03 sends the N3 path release request (1c-02) to the BS 1c-02 before requesting the N3 path release request (1c-07) (1c-14) from the BS 1c-02 in response to the N3 path release response (1c-14) from the BS 1c-2, ) May be sent an N3 path release request (1c-07) requesting to disconnect the PDU Session.

FIG. 1D illustrates a procedure for managing PDU connection settings in a terminal for data processing of a terminal according to an embodiment of the present invention.

When the UE generates data to be transmitted to the mobile communication system according to the use of an application or the like in the terminal, and is requested to transmit the data through the mobile communication system, (1d-01)

(1d-02) judges whether the PDU session is valid and whether the connection between the wireless access connection and the network is maintained.

In this case, if the PDU Session associated with the data has a valid radio access connection, resources are allocated through the radio access connection and data is transmitted through the radio resource. (1d-03)

In the concrete embodiments of the present invention described above, the elements included in the invention are expressed singular or plural in accordance with the specific embodiment shown. It should be understood, however, that the singular or plural representations are selected appropriately according to the situations presented for the convenience of description, and the present invention is not limited to the singular or plural constituent elements, And may be composed of a plurality of elements even if they are expressed.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

≪ Embodiment 2 >

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

In describing the embodiments of the present invention in detail, a main specification of 3GPP will be a communication standard defined by the present invention. However, the main point of the present invention is that even in a communication system having a similar technical background, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In describing embodiments of the present invention, a slice, a service, a network slice, a network service, an application slice, an application service, and the like may be used in combination.

The slice information Slice info means Network Slice Selection Assistance Information (NSSAI) or S-NSSAI. The NSSAI consists of a set of S-NSSAIs. Slice info for HPLMN means the slice information value set by the HPLMN mobile operator, that is, NSSAI or S-NSSAI available in the HPLMN. Slice info for VPLMN means the slice information value defined by the VPLMN mobile communication carrier, i.e., NSSAI or S-NSSAI available in the VPLMN.

The mobile communication service provider can allocate a core network node suitable for the service by slice or set of a specific slice. 2-a shows an example of the network configuration. The UE can access the 3GPP 5G Core Network (CN) through a Radio Access Network (RAN) defined by 3GPP or an Access Network (AN, e.g., WiFi) defined by non-3GPP. The 5G CN is divided into a control plane (CP) for transmitting control signals and a user plane (UP) for transmitting data traffic. The CP function has a portion shared by all slices, and there can be parts belonging to a specific slice. The UP function can belong to a specific slice. When the terminal initially accesses the network, it sends a Registration Request message. At this time, the registration request message may include slice information to be used after the terminal connects to the network. Each of the network entities constituting FIG. 2-a selects an entity capable of supporting the slice according to the slice information, and transmits a message. After the network connection, the terminal can send a PDU session setup request message for data transmission. At this time, in order to notify which slice the requesting PDU session corresponds to, a slice-related information may be included in the session setup request message. The Shared CN CP function receiving the session setup request message can select slice specific CN CP based on the requested slice information. The slice information described in the series of processes is defined as a standard value and may be a value that can be understood by all the mobile communication carriers or may be an arbitrary value determined by a specific mobile communication carrier.

Figure 2-b schematically illustrates the slice-related information stored in the terminal and the HPLMN. The terminal can join the HPLMN to use a specific slice. The slice information that can be used by the terminal is stored in the terminal and may include slice information associated with each application installed in the terminal. The HPLMN stores subscription information per terminal in the subscriber information database (UDM). In the example described in FIG. 2B, the subscription information of the UE A is stored in the UDM, and the UE A may also include usable slice information.

FIG. 2C illustrates a registration procedure when the terminal accesses a roaming network other than the HPLMN. The terminal transmits a Registration Request message to access the VPLMN (step 1). The AMF of the VPLMN (corresponding to the shared CN CP function in FIG. 2-a) that received the Registration Request message accesses the UDM of the HPLMN and confirms the subscription information of the terminal (steps 2 and 3). The AMF checks whether the terminal can be connected based on the subscription information and the local policy of the terminal received from the UDM, and then transmits a Registration Accept message to the terminal (step 4) to approve the connection. At this time, information included in each step can be changed according to the information stored in the terminal and the operation method of the network.

If the terminal has stored slice information available in the VPLMN before the connection procedure occurs, the terminal transmits the requested slice info for VPLMN to the terminal in step 1. The AMF having received the message of step 1 can confirm whether the slice information included in the message is a slice provided by the VPLMN based on local policy, roaming agreements, and the like. This confirmation process may occur after step 3. Through steps 2 and 3, the subscriber confirms whether the terminal can use the slice. More specifically, in step 2, the terminal sends the requested slice info for VPLMN information sent by the terminal to the UDM. In step 3, the UDM determines whether the terminal can use the slice based on the subscription information of the terminal and the roaming agreements between the HPLMN and the VPLMN. In step 3, the terminal transmits the slice information for VPLMN (slice info for VPLMN) Lt; / RTI > AMF can check if slice info for VPLMN received from UDM based on local policy and roaming agreements is a slice currently available in VPLMN. Step 4 sends the Registration Accept message including the finally determined allowed slice info for VPLMN to the terminal.

In another case, if there is no available slice information in the VPLMN before the connection procedure occurs, the terminal may not include the slice information in the message of step 1. The AMF having received the message of the step 1 can confirm which slice can be provided to the subscriber of the HPLMN based on the local policy and roaming agreements. This confirmation process may occur after step 3. Through the steps 2 and 3, the available slice information of the terminal can be confirmed. More specifically, terminal information is sent to the UDM in step 2. The UDM selects what slices the UE can use based on the subscription information of the UE and the roaming agreements between the HPLMN and the VPLMN. Since the UE has not made any slice requests in step 1, the HPLMN can select default slices based on the subscription information stored in the UDM. This information is not slice info for VPLMN but slice info for HPLMN. In step 3, the terminal sends the slice information (slice info for HPLMN or slice info for VPLMN) usable in the VPLMN to the AMF. When slice info for HPLMN is included in step 3, AMF symmetrically maps slice info for HPLMN received from UDM based on local policy and roaming agreements to slice info for VPLMN value corresponding to VPLMN, You can check if it is a possible slice. Alternatively, the UDM may change the slice info for HPLMN to a slice info for VPLMN based on the roaming entry and include slice info for VPLMN in step 3. AMF can check if slice info for VPLMN received from UDM based on local policy and roaming agreements is a slice currently available in VPLMN. The Registration Accept message including the final determined slice info for VPLMN is sent to the terminal in step 4.

At this time, slice info for VPLMN and corresponding slice info for HPLMN can be transmitted together with Registration Accept. The UE receiving the Registration Accept message performs the operation as described in FIG. 2-d. That is, the mapping information of the application, which is information stored in the terminal, and the Slice info for HPLMN (a set of S-NSSAIs) and the slice info for VPLMN (a set of S-NSSAIs) included in the HPLN S-NSSAI mapping information and the Registration Accept message It is possible to derive a mapping between the application of the terminal and the S-NSSAI value used in the VPLMN.

Since the terminal has not made any slice request in step 1, the slice granted to the terminal in step 4 may be default slices based on the subscription information stored in the UDM. In a subsequent operation, when the UE requests PDU session setup, the UE sends a PDU session setup request including the S-NSSAI value of the VPLMN mapped to the application.

In another case, if there is no available slice information in the VPLMN before the connection process occurs, the terminal transmits the requested slice info for HPLMN to the message of step 1 and transmits it. The AMF having received the message of step 1 can transmit the requested slice info for HPLMN information received from the terminal to the UDM in step 2. The UDM can finally select a slice available for the UE based on the subscription information and send the slice information, allowed slice info for HPLMN, to the AMF in step 3. Based on roaming agreements, AMF can change the value of the allowed slice info for HPLMN to VPLMN to slice info for VPLMN. Also, it is possible to finally determine the allowed slice info for VPLMN, which is a slice that can be provided to the UE based on local policy and the like. The AMF sends the step 4 message to the terminal, including the allowed slice info for VPLMN and corresponding slice info for HPLMN information. After step 2, the UDM can determine the allowed slice info for HPLMN and then include the slice info for HPLMN as the slice info for VPLMN in the step 3 message based on the roaming specification. The AMF can finally determine the allowed slice info for VPLMN, which is a slice that can be provided to the UE based on local policy. The AMF sends the step 4 message to the terminal, including the allowed slice info for VPLMN and corresponding slice info for HPLMN information.

In step 3 of FIG. 2C, the UDM does not include the specific slice information but may provide the network's requirement information (e.g., QoS profile) to be provided to the UE. The AMF that received the information can select a slice of VPLMN that meets the requirement, ie, determine the allowed slice info for VPLMN, and send it to the terminal in step 4.

FIG. 2-d schematically illustrates a terminal operation flowchart of the embodiment described in FIG. 2-c. Also, when there is no slice info available in the VPLMN at the initial connection, it indicates a change in the slice information stored in the terminal before and after the registration.

FIG. 2-e schematically illustrates an AMF operational flowchart of the embodiment described in FIG. 2-c.

FIG. 2-f schematically illustrates a UDM operational flowchart of the embodiment described in FIG. 2-c.

FIG. 2-g schematically illustrates the case where the slice selection and mapping-related operations of the embodiment illustrated in FIG. 2-C occur in network functions other than AMF and UDM. The AMF sends the slice information requested from the terminal to the vNF in step 4. The vNF may communicate with the hNF to determine the available slice of the terminal. The vNF may be a Network Slice Selection Function that manages the network slice of the VPLMN or a Network Repository Function that manages the network node of the VPLMN. The hNF may be a Network Slice Selection Function that manages the network slice of the HPLMN or a Network Repository Function that manages the network node of the VPLMN or a UDM that manages subscriber information. Steps 2 and 3 may be performed after step 7.

 The terminal that obtained the allowed slice info for VPLMN available in the VPLMN through the registration process uses this value in the subsequent session establishment process. Figure 2-h illustrates the PDU session setup procedure. The terminal checks the value of slice info for VPLMN mapped to the application that the user wants to use. If the PDU session corresponding to the corresponding slice does not exist at present, or if it is not possible to use the PDU session, a new PDU session setup request message is transmitted to the network in step 2. At this time, the corresponding slice info for VPLMN value is transmitted to AMF. AMF sends an NF discovery request message to vNRF to find the SMF that supports the slice (step 3). In step 3, three methods are possible in the subsequent operation. 4a is a method in which vNRF receives vSMF (s) information as an NF discovery response. The AMF sends a PDU session setup request to the vSMF without knowing the hSMF information of the HPLMN. 5a or 5b is possible after 4a. 4b is a method in which an AMF receiving vSMF (s) information as an NF discovery response requests hSMF (s) information from hNRF of HPLMN to acquire. 4c is a method in which the vNRF receiving the step 3 message acquires the hSMF (s) information by communicating with the hNRF, and includes the vSMF (s) information and the hSMF (s) information in the NF discovery response to the AMF. The AMF that has acquired the vSMF (s) information in the above three methods selects one vSMF of the vSMF (s) and transmits a PDU session setup request (step 5). The vSMF receiving the PDU session setup request can operate in three ways. 5a is a case in which the vSMF requests and obtains the hSMF (s) information capable of providing the corresponding slice to the hNRF when the hSMF (s) information is not received from the AMF. The vSMF that has acquired the hSMF (s) information selects one of the hSMFs and transmits a PDU session setup request message in step 6. 5b is a method in which vSMF does not directly communicate with hNRF but acquires hSMF (s) information via vNRF. The vSMF that has acquired the hSMF (s) information selects one of the hSMFs and transmits a PDU session setup request message in step 6. 5c is a method in which AMF acquires hSMF (s) information and transmits hSMF (s) information to vSMF through step 4b or 4c. At this time, AMF can select one hSMF of hSMF (s) and deliver it to vSMF, and vSMF sends PDU session setup request to the hSMF as in step 6. Alternatively, the AMF can deliver the hSMF (s) information to the vSMF as it is, and the vSMF selects one of the hSMFs and transmits the PDU session setup request to the hSMF as shown in step 6. The PDU session setup request of step 6 may include a slice info for VPLMN value. Upon receiving the PDU session setup request in step 6, the hSMF can acquire the slice info for HPLMN value (steps 7 and 8), which is a value of the HPLMN mapped to the slice info for VPLMN, if necessary, by communicating with the hNF. The vNF that performs this role may be a network entity that is NSSF, NRF or UDM, or any other 5G CN. The PDU session setup response is transmitted to the UE through steps 9 ~ 11.

Claims (1)

A method for processing a control signal in a wireless communication system,
Receiving a first control signal transmitted from a network;
Processing the received first control signal; And
And transmitting a second control signal generated based on the process to the network.

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