KR102277756B1 - Method for IMS based service exposure in 5G Networks and system using thereof - Google Patents

Abstract

The present invention relates to a method for opening an IMS-based service in a 5G network and a system using the same. The method according to the present invention comprises the steps of receiving a Diameter AAR message from an AF, to select a PCF to process a policy for a data session with the BSF. Transmitting an Nbsf_Management_Discovery request message, receiving an Nbsf_Management_Discovery response message including the selected PCF information from the BSF, converting the Diameter AAR message received from the AF into an Npcf_PolicyAuthorization_Create request message, and transmitting the converted Npcf_PolicyAuthorization_Create request message to the selected PCF step, receiving the Npcf_PolicyAuthorization_Create response message delivered in response to the Npcf_PolicyAuthorization_Create request message from the PCF, converting the Npcf_PolicyAuthorization_Create response message received from the selected PCF into a Diameter AAA message, and delivering the converted Diameter AAA message to the AF includes steps.

Description

Method for IMS based service exposure in 5G Networks and system using thereof

The present invention relates to a method for opening an IMS-based service in a 5G network and a system using the same.

The standard for 5G technology, which is the hottest topic in mobile communication, has been defined up to the stage at which commercialization can be promoted, and some domestic and foreign telecommunication operators are proceeding with commercialization in stages. According to the commercialization of 5G, it is predicted that various future ICT services will become the core driving force of the 4th industrial revolution. The 3GPP standardization organization has distributed 5G-related standards Rel 15 & 16, and is defining a more detailed and evolved 5G-related standard (Rel 17) from a service point of view considering full-scale commercialization.

Currently, the 5G core network and the existing IMS network are coexisting in the transitional stage of the introduction of 5G technology. Therefore, for interworking with the existing IMS network, some 5G NF (Network Function) standards are being defined in a way that accommodates even the existing interworking interface.

In particular, even if 5G technology is introduced, interworking with P-CSCF and MCPTT (Mission Critical PTT) AS (Application Server) in the IMS network and PCF, which is 5G Core NF, is required to provide IMS-based service and Mission Critical PTT service. The interworking protocol is defined as a peer-to-peer type Diameter protocol.

1 shows the configuration of an interworking network between an IMS network and a 5G network.

Currently, 3GPP Rel16 TS 29.513 defines a 5G Core NF (Network Function) interworking method for providing IMS (IP Multimedia Subsystem) based services. Acceptance of Diameter protocol and Diameter proxy/in BSF (Binding Support Function) for interworking between AF (Application Function) (eg P-CSCF) in IMS network and PCF (Policy Control Function), which is 5G Core NF Defines the Redirect (Diameter Proxy/Redirect) function, acceptance of the Diameter protocol in the PCF.

In order to configure the interworking network between the IMS network and the 5G network as shown in FIG. 1, it is necessary to accommodate the Diameter protocol in the BSF, provide the Diameter Proxy function in the BSF, and accept the Diameter protocol in the PCF.

2 to 4 are flowcharts illustrating a service processing procedure between an IMS network and a 5G network.

2 shows the Rx session creation service flow to the Proxy BSF.

① Diameter AAR: Delivers Diameter AAR (Rx interface) to BSF to create data session for IMS-based service call being processed by AF.

② BSF binding retrieval: After receiving Diameter AAR message from AF, select PCF to process data session policy.

③ Proxy Diameter AAR: Proxying Diameter AAR messages to the selected PCF.

④ Diameter AAA: PCF delivers AAA message to BSF in response to received Diameter AAR message.

⑤ Diameter AAA: BSF proxy the received AAA message to the corresponding AF.

3 shows the Rx session creation service flow to the Redirect BSF.

① Diameter AAR: Delivers Diameter AAR (Rx interface) to BSF to create data session for IMS-based service call being processed by AF.

② BSF binding retrieval: After receiving Diameter AAR message from AF, select PCF to process data session policy.

③ Diameter AAA (redirect): BSF sends information of PCF selected in 'Redirect-Host AVP' in Diameter AAA message to AF.

④ Diameter AAR: Based on the ‘Redirect-Host’ information in the Diameter AAA message received from the BSF, the Diameter AAR message is delivered to the selected PCF.

⑤ Diameter AAA: PCF delivers AAA message to AF in response to Diameter AAR message.

4 shows an Rx session creation service flow when a DRA exists in an IMS network.

① Diameter AAR: Delivers Diameter AAR (Rx interface) to DRA to create data session for IMS-based service call being processed by AF.

② Nbsf_Management_Discovery Request: The DRA requests Nbsf_Management_Discovery to the BSF to select a PCF to process the policy for the data session.

③ BSF binding retrieval: Select the PCF to process the policy for the data session.

④ Nbsf_Management_Discovery Response: The BSF transmits the selected PCF information (PCF ID) to the DRA by including it in the Nbsf_Management_Discovery response message.

⑤ Diameter AAR: Based on the information received from the BSF, the AAR message is delivered to the selected PCF by Diameter.

⑥ Diameter AAA: PCF delivers AAA message to DRA in response to Diameter AAR message.

⑦ Diameter AAA: DRA routes the received AAA message to the corresponding AF.

All three interworking methods defined in the specification must support Diameter, a peer-to-peer interworking protocol in 5G Core NF. By supporting the Diameter protocol, there are restrictions on the flexible extension structure of microservices pursued by 5G Service Based Architecture (SBA). In 5G SBA, the services provided by NF are configured in microservice units and flexible expansion is provided by using the HTTP/2 interworking protocol. In order to expand according to the acceptance of Diameter, which is the existing protocol, a separate passive network interworking operation is required. (Manual setting of interlocking peers) is required, so it has a structure not suitable for 5G SBA.

The technical problem to be solved by the present invention is to provide a method for opening an IMS-based service in a 5G network capable of flexible expansion of microservices and a system using the same.

A method according to an embodiment of the present invention for solving the above technical problem is a Diameter to create a data session for an IP Multimedia Subsystem (IMS)-based service call in a Diameter Routing Agent (DRA) in an Application Function (AF). Transmitting an AuthotizeAuthenticate-Request (AAR) message, transmitting an Nbsf_Management_Discovery request message to select a Policy Control Function (PCF) to process a policy for a data session from the DRA to a Binding Support Function (BSF), the BSF selecting a PCF to process a policy for a data session in the BSF, transmitting the selected PCF information in an Nbsf_Management_Discovery response message, and transmitting the Diameter AAR message received from the AF in the DRA as an Npcf_PolicyAuthorization_Create request message converting, transmitting the converted Npcf_PolicyAuthorization_Create request message from the DRA to the selected PCF, transmitting an Npcf_PolicyAuthorization_Create response message from the PCF to the DRA in response to the Npcf_PolicyAuthorization_Create request message to the DRA, the selected PCF from the DRA converting the Npcf_PolicyAuthorization_Create response message received from the Diameter AAA (AuthotizeAuthenticate-Answer) message, and transmitting the converted Diameter AAA message from the DRA to the AF.

Method according to another embodiment of the present invention for solving the above technical problem, receiving a Diameter AAR message from the AF, sending an Nbsf_Management_Discovery request message to select a PCF to process a policy for a data session to the BSF Step, receiving an Nbsf_Management_Discovery response message including PCF information selected from the BSF, converting the Diameter AAR message received from the AF into an Npcf_PolicyAuthorization_Create request message, transmitting the converted Npcf_PolicyAuthorization_Create request message to the selected PCF Step, receiving an Npcf_PolicyAuthorization_Create response message transmitted in response to the Npcf_PolicyAuthorization_Create request message from the PCF, converting the Npcf_PolicyAuthorization_Create response message received from the selected PCF into a Diameter AAA message, and converting the converted Diameter AAA message and transferring to the AF.

The AF may be located in an IP Multimedia Subsystem (IMS) network.

The BSF and the PCF may be located in a 5G network.

The Diameter AAR message and the Diameter AAA message may be a Diameter protocol message.

The Nbsf_Management_Discovery request message, Nbsf_Management_Discovery response message, Npcf_PolicyAuthorization_Create request message, and Npcf_PolicyAuthorization_Create response message may be Service-Based Interface (SBI) messages.

A system according to an embodiment of the present invention for solving the above technical problem is to process a policy for a data session with AF, which transmits a Diameter AAR message to create a data session for an IMS-based service call, and BSF In order to select a PCF, an Nbsf_Management_Discovery request message is sent, and the PCF information selected as a PCF to process a policy for a data session in the BSF is included in an Nbsf management discovery response message, and the Diameter AAR message received from the AF is received. Converts to an Npcf_PolicyAuthorization_Create request message, transmits the converted Npcf_PolicyAuthorization_Create request message to the selected PCF, converts the Npcf_PolicyAuthorization_Create response message transmitted in response to the Npcf_PolicyAuthorization_Create request message from the PCF into a Diameter AAA message, and the converted Diameter AAA message It includes a DRA that forwards the message to the AF.

It may include a computer-readable recording medium recording a program for executing the method according to the present invention for solving the above technical problem.

According to the present invention, it is possible to provide an IMS-based service opening method and a system using the same in a 5G network in which microservices can be flexibly expanded. In particular, NFs optimized for 5G SBA environments can be built by improving the interworking procedures and methods between 5G core NF and IMS nodes to provide IMS-based services in the transitional stage of 5G network construction.

1 shows the configuration of an interworking network between an IMS network and a 5G network.
2 to 4 are flowcharts illustrating a service processing procedure between an IMS network and a 5G network.
5 is a block diagram of an interworking network system between an IMS network and a 5G network according to the present invention.
6 is a flowchart of an IMS-based service opening method in a 5G network according to the present invention.

Then, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily implement them.

5 is a configuration diagram of an interworking network system between an IMS network and a 5G network according to the present invention, and FIG. 6 is a flowchart of an IMS-based service opening method in a 5G network according to the present invention.

5, the Diameter Routing Agent (hereinafter referred to as 'DRA') 30 according to the present invention is provided between the IMS network 10 and the 5G core network 20 between both networks ( 10, 20), the necessary work can be performed.

AF 11 represents an application function within the IMS network 10 . For example, it may include Proxy-CSCF (P-CSCF) and the like.

A Binding Support Function (BSF) 21 indicates a binding support function within the 5G core network 20 .

A Policy Control Function (PCF) 22 represents a policy control function within the 5G core network 20 .

First, the AF 11 may transmit a Diameter AAR (AuthotizeAuthenticate-Request) (Rx interface) message to the DRA 30 to create a data session for the IMS-based service call being processed in the corresponding AF 11 (S210). ).

Then, the DRA 30 may request an Nbsf_Management_Discovery request message from the BSF 21 to select a PCF to process a policy for the data session ( S220 ). The Nbsf_Management_Discovery service can obtain the address information of the selected PCF by using the HTTP GET method.

Upon receiving the Nbsf_Management_Discovery request message, the BSF 21 may select a PCF to process a policy for the corresponding data session ( S230 ).

Thereafter, the BSF 21 may include the selected PCF information (PCF ID) in the Nbsf_Management_Discovery response message and deliver it to the DRA 30 ( S240 ).

Next, the DRA 30 may convert the Diameter AAR message received in step S210 into an Npcf_PolicyAuthorization_Create request message (S250).

Thereafter, the DRA 30 may transmit the converted Npcf_PolicyAuthorization_Create request message to the PCF 22 selected in step S230 (S260).

Then, the PCF 22 performs processing according to the Npcf_PolicyAuthorization_Create request message, and transmits the Npcf_PolicyAuthorization_Create response message to the DRA 30 (S270).

Thereafter, the DRA 30 may convert the received Npcf_PolicyAuthorization_Create response message into a Diameter AAA message (S280).

Finally, the DRA 30 may transmit the converted Diameter AuthotizeAuthenticate-Answer (AAA) message to the corresponding AF 21 (S290).

The DRA 30 according to the present invention operates as a consumer of the BSF 21 to provide an Nbsf_Management_Discovery request function, and operates as a consumer of the PCF 220 to provide an Npcf_PolicyAuthorization request function, and a Diameter message Conversion function is provided. The DRA 30 may convert a Diameter message into a Service-Based Interface (SBI) message. The DRA 30 may provide a mapping function between the Rx interface/Npcf_PolicyAuthorization API and a message conversion function between the Rx interface/Npcf_PolicyAuthorizatioon API.

The embodiments described above may be implemented by a hardware component, a software component, and/or a combination of a hardware component and a software component. For example, the apparatus, methods and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate (FPGA). array), a programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For convenience of understanding, although one processing device is sometimes described as being used, one of ordinary skill in the art will recognize that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that can include For example, the processing device may include a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

The software may comprise a computer program, code, instructions, or a combination of one or more thereof, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or device, to be interpreted by or to provide instructions or data to the processing device. , or may be permanently or temporarily embody in a transmitted signal wave. The software may be distributed over networked computer systems, and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with reference to the limited drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

Claims (8)

Sending a Diameter AAR (Autho r izeAuthenticate-Request ) message in order from (Application Function) AF generating the data session for the call IMS (IP Multimedia Subsystem) based services in the (Diameter Routing Agent) DRA,
Transmitting an Nbsf_Management_Discovery request message to select a Policy Control Function (PCF) to process a policy for a data session from the DRA to a Binding Support Function (BSF);
selecting a PCF to process a policy for a data session in the BSF;
transmitting, by the BSF, the selected PCF information in an Nbsf_Management_Discovery response message;
converting the Diameter AAR message received from the AF in the DRA into an Npcf_PolicyAuthorization_Create request message;
Transmitting the converted Npcf_PolicyAuthorization_Create request message in the DRA to the selected PCF;
transmitting, in the PCF, an Npcf_PolicyAuthorization_Create response message to the DRA in response to the Npcf_PolicyAuthorization_Create request message;
Converting the Npcf_PolicyAuthorization_Create response message received from the selected PCF in the DRA into a Diameter AAA (AuthotizeAuthenticate-Answer) message, and
Transmitting the converted Diameter AAA message in the DRA to the AF
A method of opening IMS-based services in a 5G network comprising a. DRA (Diameter Routing Agent) receiving the Diameter AAR message from AF (Application Function),
transmitting, by the DRA, an Nbsf_Management_Discovery request message to select a PCF to process a policy for a data session as a Binding Support Function (BSF);
receiving, by the DRA, an Nbsf_Management_Discovery response message including PCF information selected from the BSF;
converting, by the DRA, the Diameter AAR message received from the AF into an Npcf_PolicyAuthorization_Create request message;
transmitting, by the DRA, the converted Npcf_PolicyAuthorization_Create request message to the selected Policy Control Function (PCF);
receiving, by the DRA, an Npcf_PolicyAuthorization_Create response message delivered in response to the Npcf_PolicyAuthorization_Create request message from the PCF;
converting, by the DRA, the Npcf_PolicyAuthorization_Create response message received from the selected PCF into a Diameter AAA message, and
The DRA transmitting the converted Diameter AAA message to the AF
A method of opening IMS-based services in a 5G network comprising a. 3. In claim 1 or 2,
The AF is located in an IMS (IP Multimedia Subsystem) network,
The BSF and the PCF are IMS-based service opening method in a 5G network located in the 5G network. In claim 3,
The Diameter AAR message and the Diameter AAA message are Diameter protocol messages,
The Nbsf_Management_Discovery request message, Nbsf_Management_Discovery response message, Npcf_PolicyAuthorization_Create request message, and Npcf_PolicyAuthorization_Create response message are Service-Based Interface (SBI) messages, an IMS-based service opening method in a 5G network. A computer-readable recording medium in which a program for executing any one of claims 1 or 2 is recorded on a computer. AF sending a Diameter AAR message to create a data session for an IMS-based service call; and
Sends an Nbsf_Management_Discovery request message to the BSF to select a PCF to process a policy for a data session, and receives the PCF information selected as a PCF to process a policy for a data session in the BSF in an Nbsf_Management_Discovery response message, the AF Converts the Diameter AAR message received from DRA that converts and delivers the converted Diameter AAA message to the AF
Interworking network system between IMS network and 5G network, including In claim 6,
The AF is located in an IMS (IP Multimedia Subsystem) network,
The BSF and the PCF are an interworking network system between an IMS network and a 5G network located in a 5G network. In claim 7,
The Diameter AAR message and the Diameter AAA message are Diameter protocol messages,
The Nbsf_Management_Discovery request message, Nbsf_Management_Discovery response message, Npcf_PolicyAuthorization_Create request message, and Npcf_PolicyAuthorization_Create response message are Service-Based Interface (SBI) messages, an interworking network system between an IMS network and a 5G network.

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