WO2019035404A1

WO2019035404A1 - Node group and migration method

Info

Publication number: WO2019035404A1
Application number: PCT/JP2018/029802
Authority: WO
Inventors: 拓也下城; スリサクルタコルスリ; マラレディサマ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2017-08-14
Filing date: 2018-08-08
Publication date: 2019-02-21
Also published as: JP2020194990A

Abstract

This 5GS1 node group, which includes a plurality of slices that are virtual networks, comprises: a UDM10 which includes a storage unit 100 that stores an NSSAI for identifying an available slice for each UE 3 from among the plurality of slices included in the 5GS1, and a transmission unit 101 that, in response to a request from the UE3, transmits to the 5GS1 an NSSAI corresponding to the UE3; and an NSSF20 that includes a storage unit 200 which stores correspondence information associating the NSSAIs for identifying the slices included in the 5GSI and DCN IDs for identifying slices included in a 4G eDecor2, and a transmission unit 201 that, on the basis of an NSSAI returned from the UDM10, acquires the DCN ID associated with the NSSAI, and transmits the DCN ID to the UE3.

Description

Node group and migration method

One aspect of the present invention relates to a group of nodes and a migration method for making portable terminals accessing slices included in a network (virtual networks generated on a network infrastructure) accessible to slices included in another network. .

In Non-Patent Document 1 below, a UE (User Equipment) is connected to a slice specified by a Network Slice Selection Assistance information (NSSAI) in a 5G (5th Generation, 5th generation mobile communication system) network system (5GS) including multiple slices. It is disclosed that

Non-Patent Document 2 below discloses that in a 4G (4th Generation, 4th generation mobile communication system) network (4G eDecor) including a plurality of slices, a UE is connected to a slice specified by a DCN ID (Dedicated Core Network ID) It is done.

However, compatibility is not secured between 5GS and eDecor. Therefore, for example, a UE accessing a slice included in 5GS can not access a corresponding slice included in eDecor. That is, the UE can not access corresponding slices in different networks.

One aspect of the present invention has been made in view of such problems, and it is an object of the present invention to provide a group of nodes and a migration method capable of making portable terminals accessible to corresponding slices even in different networks. .

In order to solve the problems described above, a node group according to an aspect of the present invention is a node group of a first network including a plurality of slices that are virtual networks generated on a network infrastructure, and is included in the first network. A first storage unit for storing first identification information for identifying one slice usable for each portable terminal among the plurality of slices, and a request from the portable terminal via the first network A first node having a first transmission unit for transmitting, to the first network, first identification information corresponding to the portable terminal stored in the storage unit; and one of a plurality of slices included in the first network Corresponds between second identification information for identifying a slice and third identification information for identifying a slice included in a second network different from the first network Corresponding to the second identification information corresponding to the first identification information from the second storage based on the second identification unit storing the correspondence information and the first identification information returned from the first transmission unit And a second node having a second transmission unit that acquires the attached third identification information and transmits the third identification information to the mobile terminal via the first network.

Alternatively, the migration method according to another aspect of the present invention is a node group of a first network including a plurality of slices that are virtual networks generated on a network infrastructure, and among the plurality of slices included in the first network, A first node having a first storage unit storing first identification information for identifying an available slice for each mobile terminal; and one of a plurality of slices included in the first network A second storage unit storing correspondence information in which second identification information for identifying a slice and third identification information for identifying a slice included in a second network different from the first network are associated; A migration method by a network system including a group of nodes including a second node and a portable terminal, The first access step in which the terminal accesses the first network, and the first node in the case where the portable terminal accesses in the first access step, and a request from the portable terminal via the first network is received. And a first transmission step of returning to the first network the first identification information corresponding to the portable terminal stored in the storage unit, and the second identification information returned from the first node by the second node. Based on the second storage unit, the third identification information associated with the second identification information corresponding to the first identification information is acquired, and the third identification information is transmitted to the mobile terminal via the first network. A second transmission step of transmitting; and a second access step of the portable terminal accessing a slice of the second network identified by the third identification information transmitted in the second transmission step. Including the.

According to the one aspect or the other aspect, when the portable terminal accesses the first network, the first specific information regarding slices usable by the portable terminal is returned from the first node to the first network On the other hand, third identification information on a slice included in a second network associated with second identification information on a slice corresponding to first identification information is transmitted from the second node to the mobile terminal. Thereby, for example, the mobile terminal accessing the first network is the third identification information transmitted from the second node, and is a slice of the second network corresponding to the slice of the first network usable by the own terminal. Third specific information on the As a result, it is possible to access the slice of the second network by using the third identification information in the portable terminal. That is, a mobile terminal accessing a slice included in the first network can access a corresponding slice included in the second network. That is, according to this aspect, it is possible to make the portable terminal accessible to the corresponding slice even in different networks.

According to the present invention, portable terminals can be made accessible to corresponding slices even in different networks.

It is a system configuration figure of a network system concerning this embodiment. It is a figure which shows the system configuration example of a 5G network system. It is a figure which shows the system configuration example of a 4G network. It is a functional block diagram of UDM concerning this embodiment. It is a functional block diagram of NSSF concerning this embodiment. It is a hardware block diagram of UDM and NSSF which concern on this embodiment. It is a figure which shows the example of a table of subscriber information. It is a figure which shows the example of a table of corresponding information. It is a sequence diagram which shows the 1st example of the process at the time of location registration among the migration processes performed by the network system which concerns on this embodiment. It is a sequence diagram which shows the 2nd example of the process at the time of location registration among the migration processes performed by the network system which concerns on this embodiment. It is a figure which shows the example of a table of the corresponding | compatible information which 5G UE hold | maintains after location registration. It is a sequence diagram which shows the process at the time of access to 4G network among migration processes performed by the network system concerning this embodiment.

Embodiments of the invention will be described with reference to the accompanying drawings. Where possible, the same parts will be denoted by the same reference symbols, without redundant description.

FIG. 1 is a system configuration diagram of a network system 4 according to the present embodiment. As shown in FIG. 1, the network system 4 (network system) is configured to include 5GS 1 (first network), 4 Ge Decor 2 (second network), and 5 G UE 3 (mobile terminal).

The 5GS 1 is a 5G network system including a plurality of slices. That is, 5GS1 is a mobile communication network. A slice (or network slice) is a virtual network or service network logically created on the network infrastructure by virtually separating the link of the network device and the resources of the node, and combining the separated resources. Slices separate resources and do not interfere with each other. The service refers to a service using network resources such as communication service (exclusive line service etc.) and application service (moving image distribution, service using a sensor device such as an embedded device). As shown in FIG. 1, the 5GS 1 includes a plurality of slices NS-1, NS-2, ..., NS-x.

FIG. 2 is a diagram showing an example of the system configuration of 5GS1. The 5GS 1 illustrated in FIG. 2 includes a 5G UE 3, an eNB (evolved Node B) that is a radio base station apparatus, an Access and Mobility Management Function (AMF) that is a mobility management function, and UDM (Unified Data Management) that is a subscriber information management function. A first node), an NSSF (Network Slice Selection Function, second node), which is a slice management function, and a plurality of SMFs (Session Management Function), which are session management functions. For details of the constituent elements of 5GS 1 such as eNB, AMF, and SMF, refer to various documents related to Non-Patent

Document

1 and 5G described above. In 5GS1, one SMF manages the corresponding slice (network slice, Network Slice, NS). In 5GS1, NSSAI (first and second identification information) is used as a parameter for slice selection. NSSAI is composed of multiple S-NSSAI. That is, NSSAI is a set of multiple S-NSSAI. Examples of each S-NSSAI include "service type", "slice type" and "slice differentiator". S-NSSAI includes SD (Slice Differentiator) and SST (Slice / Service type). In FIG. 2, 5G UE 3 can receive S-NSSAI from the network side at the time of registration request. The eNB selects a common CP (Control Plane) in accordance with the NSSAI. For example, S-NSSAI # 1 (included in NSSAI) selects Common CP # 1. The AMF also receives an NSSAI from the 5G UE 3 via the eNB, and selects an SMF (or a slice managed by the SMF) based on the received NSSAI. In the present embodiment, it is assumed that NSSAI and S-NSSAI are appropriately treated in the same line. That is, in the present embodiment, NSSAI and S-NSSAI may be read appropriately.

UDM is a function of managing, in a database, subscriber information including contract information, authentication information, communication service information, terminal type information, and location information of communication terminals such as 5G UE3. The NSSF is a function of managing information such as the topology of each slice, nodes constituting each slice, and the management range of AMF in a database. The node group of the present embodiment is configured to include at least UDM and NSSF. The details of the configuration of UDM and NSSF will be described later.

Returning to FIG. 1, 4G eDecor 2 is a 4G network including a plurality of slices. That is, 4G eDecor 2 is a mobile communication network. As shown in FIG. 1, 4G eDecor 2 includes a plurality of slices NS-A, NS-B,..., NS-y.

FIG. 3 is a diagram illustrating an example of a system configuration of 4G eDecor 2. The 4G eDecor 2 shown in FIG. 3 includes a UE serving as a user terminal, an eNB, an MME (Mobility Management Entity) serving as a mobility control apparatus, an HSS (Home Subscriber Serve) serving as a user information database, an SGW (Serving Gateway) serving as a gateway apparatus, It comprises SGW / PGW (Packet data network Gateway). For details of the components of 4 Ge Decor 2 such as UE, eNB, MME, HSS, SGW, and PGW, refer to various documents related to

Non Patent Literature

2 and 4 G described above. In 4G eDecor2, a combination of MME and SGW or SGW / PGW corresponds to a slice (or Dedicated Core Network). In 4G eDecor 2, DCN ID (third specific information) is used as a parameter at the time of slice selection. In 4G eDecor2, slice selection is performed at the eNB based on the DCN ID. For example, in FIG. 3, the eNB that has received the DCN ID indicating DCN ID # 1 from the UE selects slice 1 specified by the DCN ID # 1.

Returning to FIG. 1, 5G UE 3 is a user terminal in 5G. Specifically, the 5G UE 3 is a computer device such as a mobile communication terminal, a smartphone, or a notebook computer that performs 5G and 4G mobile communication.

Here, the preconditions assumed in the present embodiment will be described. First, the 5G UE 3 accesses a slice corresponding to the NSSAI transmitted by the 5G UE 3 to the 5GS 1 among the plurality of slices included in the 5GS 1. Next, 5G UE3 moves physically and moves to an area where 5GS1 is not provided and 4GeDecor2 is provided. Next, 5G UE3 accesses 4G eDecor2. The above is the precondition.

According to the network system 4 of the present embodiment, the 5G UE 3 is a slice corresponding to the slice being accessed by the 5GS 1 when accessing the 4G eDecor 2, and the slice included in the 4G eDecor 2 can be accessed. it can. In other words, 5G UE 3 is a slice corresponding to a slice of 5 GS 1 selected based on the NSSAI transmitted by 5 G UE 3 to 5 GS 1 when accessing 4 G decore 2 and is included in 4 G decore 2 Access to slices. In order to realize that, in the network system 4, the UDM manages the NSSAI related to the usable slice for every 5G UE 3, and the NSSF or AMF manages the DCN ID corresponding to the NSSAI. Then, when 5G UE3 performs location registration (registration) on 5GS1, 5GS1 notifies DCN ID corresponding to NSSAI to 5G UE3. Then, the 5G UE3 uses the received DCN ID when accessing the 4G eDecor2. The details will be described below.

FIG. 4 is a functional block diagram of the UDM 10 (first node) (which is a component of 5GS1) included in 5GS1. As shown in FIG. 4, the UDM 10 is configured to include a subscriber information storage unit 100 (first storage unit) and a subscriber information transmission unit 101 (first transmission unit).

FIG. 5 is a functional block diagram of the NSSF 20 (a second node) (which is a component of 5 GS 1) included in 5 GS 1. As shown in FIG. 5, the NSSF 20 includes a correspondence information storage unit 200 (second storage unit) and a specific information transmission unit 201 (second transmission unit).

The functional block diagrams shown in FIG. 4 and FIG. 5 show blocks in functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Moreover, the implementation means of each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly two or more physically and / or logically separated devices. It may be connected by (for example, wired and / or wireless) and realized by the plurality of devices.

For example, UDM 10 and NSSF 20 may function as a computer. FIG. 6 is a diagram illustrating an example of the hardware configuration of the UDM 10 and the NSSF 20. The above-described UDM 10 and NSSF 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007 and the like.

In the following description, the term "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the UDM 10 and the NSSF 20 may be configured to include one or more of the devices illustrated in FIG. 6 or may be configured without including some devices.

Each function in the UDM 10 and the NSSF 20 performs a calculation by causing the processor 1001 to read a predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and performs communication by the communication device 1004, a memory 1002, and a storage 1003. This is realized by controlling the reading and / or writing of data in

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described subscriber information transmission unit 101, specific information transmission unit 201, and the like may be realized by the processor 1001.

Also, the processor 1001 reads a program (program code), a software module or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processing according to these. As a program, a program that causes a computer to execute at least a part of the operations described in the present embodiment is used. For example, the above-described subscriber information transmission unit 101, specific information transmission unit 201, etc. may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and similarly realized for other functional blocks. It is also good. The various processes described above have been described to be executed by one processor 1001, but may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer readable recording medium, and includes, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). It may be done. The memory 1002 may be called a register, a cache, a main memory (main storage device) or the like. The memory 1002 can store a program (program code) that can be executed to implement the paging method according to the present embodiment, a software module, and the like.

The storage 1003 is a computer readable recording medium, and for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray A (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like may be used. The storage 1003 may be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database including the memory 1002 and / or the storage 1003, a server or any other suitable medium. For example, the above-described subscriber information storage unit 100, correspondence information storage unit 200, and the like may be realized by the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, or the like. For example, the above-described subscriber information transmission unit 101, specific information transmission unit 201, and the like may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

In addition, devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured by a single bus or may be configured by different buses among the devices.

In addition, the UDM 10 and the NSSF 20 include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). It may be configured, and part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented in at least one of these hardware.

Hereinafter, each functional block of UDM10 shown in FIG. 4 is demonstrated.

The subscriber information storage unit 100 stores information for managing a subscriber who uses a service provided by the 5GS 1. That is, the subscriber information storage unit 100 specifies terminal identification information (UE-ID) for identifying the 5G UE 3 and a first slice for identifying one slice that the 5G UE 3 can use among a plurality of slices included in the 5GS 1. (1) Store subscriber information associated with S-NSSAI (or NSSAI), which is specific information. FIG. 7 is a diagram showing an example of a table of subscriber information stored by the subscriber information storage unit 100. As shown in FIG. In the table example of the correspondence information shown in FIG. 7, the UE-ID and the subscribed NSSAI, which is the first identification information, are associated. This Subscribed NSSAI is configured of an S-NSSAI, SD (Slice Differentiator) and SST (Slice / Service type). Note that multiple sets of S-NSSAI may be associated with one UE-ID. As such subscriber information, first specific information (Subscribed NSSAI) on slices usable for each of a plurality of 5G UEs 3 is managed.

Returning to FIG. 4, the subscriber information transmission unit 101 corresponds to the subscriber information stored by the subscriber information storage unit 100 in response to a location registration request via 5G UE3 to another node in 5GS1 etc. The first specific information (Subscribed NSSAI) associated with the terminal identification information (UE-ID) of the 5G UE3 is extracted, and the extracted first specific information is returned to the other node etc. of the request source in 5GS1. Do. Here, the subscriber information transmitting unit 101 is not limited to sending back the first specific information in response to the request for location registration, but may be the first specific information in response to another request from the 5G UE 3 such as a connection request. You may reply.

Next, each functional block of the NSSF 20 shown in FIG. 5 will be described.

The correspondence information storage unit 200 is included in S-NSSAI (or NSSAI), which is second identification information for identifying one slice among a plurality of slices included in 5GS1, and in 4G eDecor2, which is a network different from 5GS1. Correspondence information in which DCN ID, which is third identification information for identifying a slice to be transmitted, is stored. In the correspondence information, permission information (Allowed NSSAI) indicating that the slice identified by the second identification information is usable in 5GS 1 may be further associated with the second identification information. If the same NSSAI as the second identification information is stored as the permission information, it is indicated that the slice identified by the second identification information is usable. Furthermore, in the correspondence information, information (AMF) that specifies an AMF that manages communication connection in the slice specified by the second specification information may be further associated with the second specification information. Further, the correspondence information may be managed for each location registration area (Location) of 5G UE3.

FIG. 8 is a diagram showing an example of a table of correspondence information stored by the correspondence information storage unit 200. As shown in FIG. In the example of the correspondence information table shown in FIG. 8, for the second specific information Subscribed NSSAI, Allowed NSSAI which is permission information, DCN ID which is third specific information, and information (AMF) for specifying AMF. , And information (Location) indicating a location registration area are associated with each other. The S-NSSAI and DCN ID have the same information, and the parameters may overlap because they are not conscious of 4G / 5G. Also, the representation method may be different, such as bit length.

Referring back to FIG. 5, when the specific information transmission unit 201 receives the first specific information (Subscribed NSSAI) from the UDM 10 via the other nodes in 5GS 1, the specific information transmission unit 201 uses the correspondence information stored by the correspondence information storage unit 200. , And third identification information (DCN ID) and permission information (Allowed NSSAI) associated with second identification information corresponding to the received first identification information (Subscribed NSSAI), and extracted DCN ID and Allowed NSSAI Are transmitted to 5G UE 3 (eg, via another node in 5 GS 1). The specific information transmission unit 201 may transmit the DCN ID to the 5G UE 3 when the 5G UE 3 performs position registration with the 5GS 1. More specifically, when the 5G UE 3 performs position registration with 5 GS 1, the specific information transmission unit 201 takes care when receiving NSSAI (via another node etc.) from 5 G UE 3 (with the position registration request) The DCN ID associated with the received NSSAI may be extracted from the correspondence information stored by the information storage unit 200, and the extracted DCN ID may be transmitted to the 5G UE 3 (via another node or the like).

Also, when extracting the third identification information (DCN ID) from the correspondence information stored by the correspondence information storage unit 200, the identification information transmission unit 201 corresponds to the slice indicated as being usable by the permission information. You may make it extract DCN ID and Allowed NSSAI. Specifically, the specific information transmission unit 201 acquires only the DCN ID that is associated with the Subscribed NSSAI and in which the same Allowed NSSAI is associated with the Subscribed NSSAI, and transmits only the DCN ID. You may do so.

Hereinafter, the process of the network system 4 including the process of the UDM 10 and the NSSF 20 will be described using FIGS. 9 and 10. FIG. 9 is a sequence diagram showing a first example of processing at the time of location registration in 5GS 1 among migration processing (migration method) executed by the network system 4. As shown in FIG. 9, the 5GS1 includes 5G UE3, 5G RAN (Radio Access Network), Default AMF, Dedicated AMF, UDM 10, and SMF (Session Management Function) and UPF (User Plane Function). Do. The Default AMF is an AMF to which a location registration request is transferred from the RAN at the time of initial connection by 5G UE3, and the Dedicated AMF is a location registration request transfer based on the NSSAI included in the location registration request after the first connection. AMF In addition, it is assumed that the terminal identification information (UE-ID) of the 5G UE 3 is also transferred in the entire process (or part of the process).

In FIG. 9, first, 5 GS 1 is accessed by transmitting a Registration Request, which is a location registration request, from 5 G UE 3 to 5 G RAN (step S 1). The request includes Requested NSSAI which is an NSSAI (Configured NSSAI) that wants to connect. The NSSAI includes S-NSSAI-1 and S-NSSAI-2.

Next, in 5G RAN, it is determined to transfer to Default AMF for the first connection from 5G UE 3 (step S2). Next, a Registration Request is transmitted from the 5G RAN to the Default AMF (step S3). The request includes the Requested NSSAI transmitted at S1.

Next, in response to receiving the Registration Request, the Default AMF transmits a Subscription Request to the UDM 10 (step S4). The request includes the UE-ID relating to the 5G UE 3 that is the transmission source of the Registration Request. On the other hand, the subscriber information transmission unit 101 of the UDM 10 extracts, from the subscriber information stored in the subscriber information storage unit 100, the Subscribed NSSAI corresponding to the UE-ID of 5G UE3 transmitted in S4. (Searched). Then, the extracted Subscribed NSSAI is transmitted from the UDM 10 to the Default AMF (step S5). This NSSAI includes Subscribed S-NSSAIs, which is a pair of S-NSSAI corresponding to the same slice.

Next, Default AMF determines whether the correspondence information on Requested NSSAI received in step S3 is already held, and in the case of holding, skips the processing of steps S7a, S7b, S8a, and S8b described later. It transmits Allowed NSSAI and DCN ID corresponding to Requested NSSAI to 5G UE3. On the other hand, when the correspondence information is not held, the process proceeds to the following procedure (step S6). That is, a slice selection request (Slice Selection Request) including the Subscribed NSSAI acquired from the UDM 10 and the Requested NSSAI included in the position registration request is transmitted from the Default AMF to the NSSF 20 (step S7a). On the other hand, the permission information (Allowed NSSAI) and DCN ID associated with the subscribed NSSAI are extracted and extracted from the correspondence information stored by the correspondence information storage unit 200 by the specific information transmission unit 201 of the NSSF 20. A slice selection response (Slice Selection Response) including Allowed NSSAI and DCN ID is transmitted to the Default AMF (step S7b). The slice selection response may include AMF information corresponding to Allowed NSSAI in the correspondence information stored in the NSSF 20.

Next, S8a or S8b described later is executed by the Default AMF (and 5G RAN). That is, a Reroute NAS message is transmitted from the Default AMF to the 5G RAN and subsequently from the 5G RAN to the Dedicated AMF (the message includes the NSSAI and DCN ID received in S7 b). (Step S8a) or Reroute NAS message is transmitted from the Default AMF to the Dedicated AMF (the message includes the NSSAI and DCN ID received in S7b) (step S8b).

Next, UP Establishment Req / Resp is transmitted and received between the Dedicated AMF and the SMF and UPF (step S9). Next, a Registration Response is transmitted from the Dedicated AMF to the 5G UE 3 (step S10). The response includes the NSSAI and DCN ID transmitted at S8a or S8b.

FIG. 10 is a sequence diagram showing a second example (different from the first example) of the process at the time of location registration in 5GS 1 among migration processes (migration method) executed by the network system 4. Hereinafter, differences from the sequence diagram described with reference to FIG. 9 will be mainly described.

In FIG. 10, S20 to S22 are the same as S1 to S3 in FIG. 9, respectively. Moreover, S23a and S23b are respectively the same as S8a and S8b of FIG. S24 to S27 are the same as S4 to S5 and S7a to S7b in FIG. 9, respectively, and the difference is that the transmission sources of S4 and S7a and the transmission destinations of S5 and S7b are changed from Default AMF to Dedicated AMF. . S28 and S29 are respectively the same as S9 and S10 of FIG. That is, the processing procedures of FIG. 9 and FIG. 10 differ only in that the redirect processing is performed before and after.

As described above, the DCN ID corresponding to S-NSSAI is notified to 5G UE3. After S10 in FIG. 9 (after location registration) or after S29 in FIG. 10 (after location registration), 5G UE3 that has received a DCN ID from 5GS1 (NSSF 20) uses the DCN ID in S1 or S20. The transmitted S-NSSAI and information identifying the application scheduled to be used in the slice specified by the S-NSSAI are stored in the own terminal in association with each other. FIG. 11 is a diagram showing an example table of correspondence information held by the 5G UE after location registration. In the example of the correspondence information table shown in FIG. 11, the information for identifying the application, the S-NSSAI, and the DCN ID are associated with each other.

Subsequently, a procedure at the time of access to 4 Ge Decor 2 by 5 G UE 3 that has received a DCN ID from 5 GS 1 (NSSF 20) will be described using FIG. FIG. 12 is a sequence diagram showing processing at the time of access to 4 Ge Decor 2 among migration processing executed by the network system 4 according to the present embodiment. As shown in FIG. 12, 4G eDecor 2 includes 5G UE3, 4G RAN, Default MME, Dedicated MME, HSS, and Dedicated S / PGW.

In FIG. 12, first, an Attach Request, which is an attach request, is transmitted from the 5G UE 3 to the 4G RAN (step S30). The request includes the DCN ID (Accepted DCN ID) and APN (Access Point Name) received from the 5GS 1 (NSSF 20). Next, in the 4G RAN, it is determined to transfer to the Default MME for the first connection from the 5G UE 3 (step S31). Next, an Attach Request is transmitted from the 4G RAN to the Default MME (step S32). The request includes the DCN ID and APN transmitted at S30. Next, a UE subscription request is transmitted from the Default MME to the HSS (step S33). The request includes the DCN ID transmitted at S32. Next, UE subscription Response is transmitted from the HSS to the Default MME (step S34). The request includes one or more DCN IDs (Subscribed DCN ID (s)) corresponding to the DCN ID transmitted at S33.

Next, Re-route Request is transmitted from the Default MME to the 4G RAN, and subsequently from the 4G RAN to the Dedicated MME (step S35). The message includes GUMMEI (Globally Unique MME Identifier), the DCN ID sent at S34, and the APN sent at S32. Next, Create Session Req / Resp is transmitted and received between the Dedicated MME and the Dedicated S / PGW (Step S36). Next, Attach Accept is transmitted from the Dedicated MME to the 5G UE 3 (Step S37). The accept includes the DCN ID transmitted in S35 and the policy for mapping the DCN ID to the application in 5G UE3.

Next, the operation and effect of the network system 4 configured as in the present embodiment will be described.

Here, conventionally, after the 5G UE accesses the slice included in the 5GS, it is not considered to move to the area provided with the 4Ge decor and to access the slice included in the corresponding 4 Ge Decor. . That is, backward compatibility from 5GS to 4G eDecor was not secured. From the viewpoint of backward compatibility, it is necessary to associate the NSSAI with the DCN ID.

According to the network system 4 (the node group including the UDM 10 and the NSSF 20 included therein) configured as in the present embodiment, the 5G UE 3 can be used when the location registration request (access) is made from the 5G UE 3 to the 5GS 1 A subscribed NSSAI for a specific slice is returned from the UDM 10 to the 5GS1, and in response to that, a DCN ID for a slice included in the 4G decoror 2 associated with the NSSAI corresponding to the subscribed NSSAI is transmitted from the NSSF 20 to the 5G UE3. As a result, for example, the 5G UE 3 accessing the 5GS 1 can obtain the DCN ID related to the slice of 4 Ge Decor 2 corresponding to the slice of 5 GS 1 that is the DCN ID transmitted from the NSSF 20 and that can be used by the own terminal. As a result, it is possible to access the slice of 4G decoror 2 by using the DCN ID in 5 G UE3. That is, 5G UE3 accessing a slice included in 5GS1 can access a corresponding slice included in 4G decoror2. That is, according to (the group of nodes included in) such a network system 4, it is possible to make the 5G UE 3 accessible to the corresponding slice even in different networks.

Further, according to (the group of nodes included in) the network system 4 configured as in the present embodiment, the NSSF 20 is associated with the NSSAI corresponding to the Subscribed NSSAI, and is associated with the Allowed NSSAI. The DCN ID is sent to 5G UE3. By this, it is possible to transmit to 5G UE 3 only the information related to the slice of 4G decoror 2 corresponding to the slice made available in 5 GS 1. Therefore, the services provided to 5G UE 3 by

5GS

1 and 4G eDecor 2 can be made uniform.

Further, according to (the group of nodes included in) the network system 4 configured as in the present embodiment, the 5GS 1 is a mobile communication network, and when the 5G UE 3 performs location registration with the 5GS 1, the DCN ID is 5G UE 3 Sent to As a result, the 5G UE 3 can acquire the DCN ID only by performing the existing location registration process and without performing any other special process. That is, since the existing nodes and processes can be used almost as they are when constructing the network system 4, it is cost effective, and there is no need to perform special processes, so that DCN IDs can be acquired faster. it can.

As mentioned above, although this embodiment was described in detail, it is clear for persons skilled in the art that this embodiment is not limited to the embodiment described in this specification. This embodiment can be implemented as a modification and a change mode, without deviating from the meaning and range of the present invention which become settled by statement of a claim. Therefore, the description of the present specification is for the purpose of illustration and does not have any limitation on the present embodiment.

The notification of information is not limited to the aspects / embodiments described herein, and may be performed in other manners. For example, notification of information may be physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Also, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect / embodiment described in the present specification is LTE, LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark) The present invention may be applied to a system utilizing any other appropriate system and / or a next generation system expanded based on these.

As long as there is no contradiction, the processing procedure, sequence, flow chart, etc. of each aspect / embodiment described in this specification may be reversed. For example, for the methods described herein, elements of the various steps are presented in an exemplary order and are not limited to the particular order presented.

The specific operation as being performed by a particular device herein may in some cases be performed by its upper node. For example, when a specific device is a base station, various operations performed for communication with a terminal in a network consisting of one or more network nodes having the base station are: It will be appreciated that it may be performed by the base station and / or other network nodes other than the base station, such as but not limited to an MME or an S-GW etc. Although the case where one other network node other than a base station was illustrated above was illustrated, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and the like may be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input and output may be performed via a plurality of network nodes.

The input / output information or the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input or output may be overwritten, updated or added. The output information etc. may be deleted. The input information or the like may be transmitted to another device.

The determination may be performed by a value (0 or 1) represented by one bit, may be performed by a boolean value (Boolean: true or false), or may be compared with a numerical value (for example, a predetermined value). Comparison with the value).

Each aspect / embodiment described in this specification may be used alone, may be used in combination, and may be switched and used along with execution. In addition, notification of predetermined information (for example, notification of "it is X") is not limited to what is explicitly performed, but is performed by implicit (for example, not notifying of the predetermined information) It is also good.

Software may be called software, firmware, middleware, microcode, hardware description language, or any other name, and may be instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. Should be interpreted broadly to mean applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc.

Also, software, instructions, etc. may be sent and received via a transmission medium. For example, software may use a wireline technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or a website, server or other using wireless technology such as infrared, radio and microwave When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips etc that may be mentioned throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any of these May be represented by a combination of

The terms described in the present specification and / or the terms necessary for the understanding of the present specification may be replaced with terms having the same or similar meanings. For example, the channels and / or symbols may be signals. Also, the signal may be a message. Also, the component carrier (CC) may be called a carrier frequency, a cell or the like.

The terms "system" and "network" as used herein are used interchangeably.
In addition, the information, parameters, and the like described in the present specification may be represented by absolute values, may be represented by relative values from predetermined values, or may be represented by corresponding other information. . For example, radio resources may be indexed.

The names used for the parameters described above are in no way limiting. In addition, the formulas etc. that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg PUCCH, PDCCH etc.) and information elements (eg TPC etc.) can be identified by any suitable names, the various names assigned to these various channels and information elements can be Is not limited.

A base station can accommodate one or more (e.g., three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small base station RRH for indoor use: Remote Communication service can also be provided by Radio Head. The terms "cell" or "sector" refer to a part or all of the coverage area of a base station and / or a base station subsystem serving communication services in this coverage. Furthermore, the terms "base station" "eNB", "cell" and "sector" may be used interchangeably herein. A base station may be called in terms of a fixed station (Node station), NodeB, eNodeB (eNB), access point (access point), femtocell, small cell, and the like.

Mobile communication terminals may be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, by those skilled in the art. It may also be called a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term.

The terms "determining", "determining" as used herein may encompass a wide variety of operations. “Decision”, “decision” are, for example, calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another) Search in data structures), ascertaining may be considered as “judgement” or “decision”. Also, "determination" and "determination" are receiving (e.g. receiving information), transmitting (e.g. transmitting information), input (input), output (output), access (Accessing) (for example, accessing data in a memory) may be regarded as “judged” or “decided”. Also, "judgement" and "decision" are to be regarded as "judgement" and "decision" that they have resolved (resolving), selecting (selecting), choosing (choosing), establishing (establishing) May be included. That is, "judgment" "decision" may include considering that some action is "judged" "decision".

The terms "connected", "coupled" or any variants thereof mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled”. The coupling or connection between elements may be physical, logical or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and radio frequency as some non-limiting and non-exclusive examples. It can be considered "connected" or "coupled" to one another by using electromagnetic energy such as electromagnetic energy having wavelengths in the region, microwave region and light (both visible and invisible) regions.

As used herein, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

Where the designations "first", "second" etc. are used herein, any reference to such elements does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way of distinguishing between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be taken there, or that in any way the first element must precede the second element.

The “means” in the configuration of each device described above may be replaced with a “unit”, a “circuit”, a “device” or the like.

As long as "includes", "including", and variations thereof are used in the present specification or claims, these terms as well as the term "comprising" Is intended to be comprehensive. Further, it is intended that the term "or" as used in the present specification or in the claims is not an exclusive OR. In the present specification, a plurality of devices are also included unless it is a device clearly having only one context or technically.

Throughout this disclosure, unless the context clearly indicates otherwise, it is intended to include the plural.

One mode of the present invention is to use nodes and migration methods, and to make portable terminals accessible to corresponding slices even in different networks.

1 ... 5 GS (first network), 2 ... 4 G eDecor (second network), 3 ... 5 G UE (mobile terminal), 4 ... network system (node group), 10 ... UDM (first node), 20 ... NSSF (second node), 100 ... subscriber information storage unit (first storage unit), 101 ... subscriber information transmission unit (first transmission unit), 200 ... correspondence information storage unit (second storage Unit), 201: Specific information transmission unit (second transmission unit).

Claims

A node group of a first network including a plurality of slices, which are virtual networks created on a network infrastructure, comprising:
A first storage unit for storing first specification information for specifying one slice usable for each portable terminal among the plurality of slices included in the first network; and the first storage unit from the portable terminal A first node having a first transmission unit that returns the first identification information corresponding to the portable terminal stored in the storage unit to the first network in response to a request via a network;
Second identification information for identifying one slice of the plurality of slices included in the first network, and third identification information for identifying a slice included in a second network different from the first network And corresponding to the first identification information from the second storage based on the first identification information returned from the first transmission unit. A second transmission unit configured to acquire the third identification information associated with the second identification information to be transmitted, and transmit the third identification information to the mobile terminal via the first network; Nodes, and
Nodes with
The second storage unit corresponds, to the second identification information, permission information indicating that the slice specified by the second identification information is usable in the first network, in the correspondence information. And store further,
The second transmission unit stores the second identification information associated with the second identification information corresponding to the first identification information and associated with the permission information. Obtaining the third specific information from the mobile terminal;
The node group according to claim 1.
The first network is a mobile communication network,
The second transmission unit transmits the third identification information to the mobile terminal when the mobile terminal performs position registration in the first network.
The node group according to claim 1 or 2.
A node group of a first network including a plurality of slices, which are virtual networks generated on a network infrastructure, and one slice usable for each mobile terminal among the plurality of slices included in the first network A first node having a first storage unit for storing first identification information for identification; and second identification information for identifying one slice of the plurality of slices included in the first network A group of nodes comprising a second node having a second storage unit for storing correspondence information in which the second identification information is associated with third identification information for identifying a slice included in a second network different from the first network And a migration method by a network system including a mobile terminal,
A first access step in which the mobile terminal accesses the first network;
When the first node accesses the portable terminal in the first access step and receives a request from the portable terminal via the first network, the storage unit stores the first node in the storage unit. A first transmission step of returning the first specific information corresponding to a portable terminal to the first network;
The second node is associated with the second identification information corresponding to the first identification information from the second storage unit based on the first identification information returned from the first node. A second transmitting step of acquiring the third specific information, and transmitting the third specific information to the portable terminal via the first network;
A second access step in which the portable terminal accesses a slice of the second network identified by the third identification information transmitted in the second transmission step;
Migration method including