KR20220138829A - Method for supporting trusted af in 5g system for time sensitive services - Google Patents

Abstract

Provided is a method for supporting a reliable application function (AF) in a fifth generation (5G) system for time sensitive-type services. The method comprises: a step of allowing the reliable AF to request TSC assistance information (TSCAI), deterministic QoS, and time synchronization information from a policy control function (PCF); and a step of allowing the PCF to perform transmission to a session management function (SMF) to be applied to a protocol data unit (PDU) session. The reliable AF can communicate with the PCF by using an Npcf_PolicyAuthorization service interface. Accordingly, the present invention enables service reception by directly communicating in the 5G system without construction of an additional exposure function in the case of an application service constructed by a communication business person.

Description

How to support trust AF in 5G system for time-sensitive service

The present invention relates to a time-sensitive service technology of a 3GPP 5G system, and more particularly, to a method of supporting a trusted application function (AF) of a 5G system for a time-sensitive service.

Referring to 3GPP Rel-17, various types of application services such as audio, video, and image may request time-sensitive services from the 5G system. These application services are located in the network outside the operator, and using the service exposure function as an application function (AF), a time-sensitive service can be requested through the network exposure function (NEF) in the 5G system. That is, in 3GPP Rel-17, AF of various types of application services can request time-sensitive services through NEF's service exposure function. Only AF (Untrusted AF) is supported. However, some application services are located in the trust domain of a telecommunication service provider and request a time-sensitive service, which raises the need for Trusted AF.

One problem to be solved by the present invention is to provide a method for requesting a time-sensitive service using a service interface in a 5G system so that a trusted AF located in a trust domain in the 5G system can request a time-sensitive service. .

In addition, one problem to be solved by the present invention is that, in order to provide the time-sensitive service provided by the 5G system to the trusted AF located in the 5G system, the trusted AF provides a time-sensitive service using a service interface. It is to provide a method for directly requesting QoS and time synchronization service and receiving the service within the 5G system.

In a method for supporting trusted AF in a 5G system for a time-sensitive service according to an embodiment of the present invention, the trusted AF provides a Policy Control Function (PCF) with TSCAI (TSC Assistance Information), deterministic QoS (QoS), time requesting synchronization information; and transmitting the PCF to a Session Management Function (SMF) and applying it to a Protocol Data Unit (PDU) session, wherein the trusted AF may communicate with the PCF using an Npcf_PolicyAuthorization service interface.

According to embodiments of the present invention, not only untrusted AF but also trusted AF can request a time-sensitive service provided by the 5G system, so in the case of an application service built by a telecommunication service provider, there is no need to build an additional exposure function in the 5G system. You can receive services by communicating directly with

1 is a diagram for explaining a network exposure function of a 3GPP 5G system.
2 is a diagram for explaining a 5G system including trusted AF according to an embodiment of the present invention.
3 is a diagram for explaining a procedure in which the trusted AF transmits QoS, time synchronization, and TSCAI information according to an embodiment of the present invention.
4 is a diagram for explaining a procedure in which a trusted AF transmits PMIC/BMIC information according to an embodiment of the present invention.
5 is a diagram for explaining a procedure of trust AF according to PMIC/BMIC information change according to an embodiment of the present invention.
6 is a diagram for explaining a procedure for a trusted AF to report a BMCA result according to an embodiment of the present invention.
7 is a diagram for describing a procedure in which a trusted AF uses a service exposure function according to an embodiment of the present invention.
8 is a block diagram illustrating a computing device according to an embodiment of the present invention.

Hereinafter, 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. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification and claims, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

In addition, terms such as "... unit", "... group", and "module" described in the specification may mean a unit capable of processing at least one function or operation described in this specification, which It may be implemented in hardware or software or a combination of hardware and software.

1 is a diagram for explaining a service exposure function of a 3GPP 5G system.

Referring to FIG. 1 , in relation to the service exposure function of the 3GPP 5G system, AFs 130a and 130c are located outside the TRUST DOMAIN of the telecommunication service provider. In the case of such untrusted AF, a time-sensitive service can be requested only through the service exposure function.

The time-sensitive services requested by the AFs 130a and 130c using the service exposure are shown in Tables 1 and 2 below. Table 1 shows time synchronization information (or time synchronization parameters) that the AFs 130a and 130c can request, and Table 2 shows that the AFs 130a and 130c request the NEFs 122a and 122b using the requested service interface. Indicates possible time-sensitive QoS information (time-sensitive QoS parameters).

time synchronization parameters Explanation Time synchronization distribution method Identifies the time synchronization distribution method requested by AF.
Allowed values: IEEE Std 1588 [74] operation (ie as a Boundary Clock, peer-to-peer Transparent Clock, or end-to-end Transparent Clock) and transport protocol (Ethernet, UDP over IPv4, or UDP over IPv6), IEEE Std 802.1AS [75] operation, or Access Stratum-based 5G clock sync. Grandmaster enabled Indicates whether AF requests 5GS to act as a grandmaster for PTP or gPTP (depending on the requested Time synchronization distribution method).
This is applicable for IEEE Std 1588 [74] or IEEE Std 802.1AS [75] operation. Grandmaster priority Indicates a priority used as defaultDS.priority1 when generating Announce message when 5GS acts as (g)PTP GM. Time Domain As defined in IEEE Std 1588 [74]

Service operation name input parameters Nnef_AFsessionWithQoS Create Requested 5GS delay, Requested GFBR, Requested MFBR, Flow Direction, Burst Size, Burst Arrival Time at UE (uplink) or UPF (downlink), Periodicity, Time domain Nnef_AFsessionWithQoS Update Requested 5GS delay, Requested GFBR, Requested MFBR, Flow Direction, Burst Size, Burst Arrival Time at UE (uplink) or UPF (downlink), Periodicity, Time domain

2 is a diagram for explaining a 5G system including a trusted AF according to an embodiment of the present invention. Referring to FIG. 2 , a trusted AF 130 located in a trusted domain of a communication service provider according to an embodiment of the present invention. represents a structure for direct communication with the PCF 126 .

As shown in FIG. 2 , the trusted AF 130 may directly communicate with the PCF 126 as well as the NEF 122 through a Service Based Interface (SBI). Although the basic structure of the 3GPP 5G system has already defined reliable AF, the current 3GPP 5G standard uses only untrusted AF as a target for time-sensitive service provision. Accordingly, the embodiments of the present invention provide additional definition of a service interface and related service procedures in order to expand the time-sensitive service to a time-sensitive service structure including trusted AF, which can also provide a time-sensitive service to the trusted AF 130 . can do.

FIG. 3 is a diagram for explaining a procedure in which a trusted AF transmits QoS, time synchronization, and TSC Assistance Information (TSCAI) information according to an embodiment of the present invention.

Referring to FIG. 3 , a procedure for the trusted AF 130 to provide “TSC Assistance Container” information for time-sensitive communication (TSC) according to an embodiment of the present invention is shown. Trust AF 130, traffic pattern parameters (eg, "Flow Direction", "Periodicity", "Burst Arrival Time", "Survival Time", "Time Domain") in the form of "TSC Assistance Container" PCF ( Policy Control Function) 126 may be provided to the SMF (Session Management Function) 114 . In this case, the trusted AF 130 may generate a "TSC Assistance Container" applicable to both Ethernet or IP type Protocol Data Unit (PDU) sessions and provide it to the PCF 126 .

In addition, the trust AF 130 may request QoS (deterministic QoS) for time-sensitive services. The time-sensitive service QoS procedure may use the procedure shown in FIG. 3 as it is. Even when the trusted AF 130 requests a time synchronization service, the procedure shown in FIG. 3 may be used as it is.

Accordingly, in FIG. 3 , the AF 130 may request "TSC Assistance Container", time-sensitive service QoS, time synchronization information, etc. to the PCF 126, respectively, and the PCF 126 delivers it to the SMF 114. Thus, it can be applied to the PDU session. At this time, the trusted AF 130 may communicate with the PCF 126 using the Npcf_PolicyAuthorization service interface, and "TSC Assistance Container", time-sensitive service QoS, time synchronization information, etc. may be included in the Npcf_PolicyAuthorization service interface.

FIG. 4 is a diagram for explaining a procedure in which a trusted AF transmits Port Management Information Container (PMIC)/Bridge Management Information Container (BMIC) information according to an embodiment of the present invention.

4, the trusted AF 130 according to an embodiment of the present invention is a PTP (Precision Time Protocol) function of a Network-Side TSN Translator (NW-TT)/Device-Side TSN Translator (DS-TT) ( PTP Functionality) is determined, and a procedure for setting a PTP instance using PMIC/BMIC signaling is shown.

DS-TT has port management information (PMI) for each port, and NW-TT has bridge management information (BMI) of 5G system as well as PMI. PMI and BMI may be delivered between DS-TT/NW-TT and Trust AF as PMIC (PMI Container) and BMIC (BMI Container), which are containers, respectively. Accordingly, the AF 130 may generate and manage the PMIC/BMIC.

In FIG. 4, when the AF 130 transfers the BMIC or PMIC information to the PCF 126, the PCF 126 performs the "PCF initiated SM Policy Association Modification" procedure to finally obtain the BMIC or PMIC information DS-TT/NW -Transfer by TT.

5 is a diagram for explaining a procedure of trust AF according to PMIC/BMIC information change according to an embodiment of the present invention.

Referring to FIG. 5, when the PMIC/BMIC information is changed, the PMIC/BMIC information reported in the DS-TT/NW-TT is transferred to the trusted AF 130 by the SMF 114 via the PCF 126. indicates the procedure. When the change of PMIC / BMIC information is reported, the SMF 114 reports to the PCF 126 by performing the "SMF initiated SM Policy Association Modification" procedure, and the PCF 126 reports the Npcf_PolicyAuthorization service interface (eg Npcf_PolicyAuthorization_Notify message). ) may be used to transmit the corresponding information to the AF 130 .

6 is a diagram for explaining a procedure for a trusted AF to report a BMCA result according to an embodiment of the present invention.

Referring to Figure 6, the trust AF 130 shows a procedure for receiving a BMCA result. Trust AF 130 may register a notification (Notification) to the UPF / NW-TT (104) for the PTP port state change according to the BMCA result. As a result of the BMCA, if the port state is changed, the UPF/NW-TT 104 may report the changed port state to the registered AF. In this case, the trusted AF 130 may receive a port status report from the NW-TT/DS-TT through the BMIC. According to the changed port state, the AF 130 may request a QoS flow change for PTP message processing in accordance with IEEE 802.1AS and IEEE 1588 requirements.

7 is a diagram for explaining a procedure in which a trusted AF uses a service exposure function according to an embodiment of the present invention.

Referring to FIG. 7 , a procedure in which the trusted AF 130 according to an embodiment of the present invention can receive a time-sensitive service by using the service exposure function in the same way as the untrusted AF is shown. That is, just as the existing untrusted AF receives a time-sensitive service through the NEF 122 , the trusted AF 130 may receive the service through the NEF 122 in the same way. Accordingly, in a situation in which the communication service provider has already built a system for the untrusted AF service, there is an advantage in that the existing system can be used as it is without the need to newly build an additional function for the trusted AF 130 .

7 shows the QoS exposure service procedure defined in the current 3GPP TS 23.502, and when the trusted AF 130 requests time-sensitive QoS, the trusted AF 130 establishes the NEF 122 according to the procedure of FIG. Through the PCF 126 may request a deterministic QoS (Deterministic QoS).

When the trusted AF 130 requests the time synchronization service, the untrusted AF may use the service interface and procedure for requesting the time synchronization service as it is. In TS 23.502, standard work for an untrusted AF to request a time synchronization service is in progress. When the standard specification is completed, the trusted AF 130 can also use the time synchronization service exposure procedure through the NEF 122 as it is.

When the trusted AF 130 uses the service exposure function through the NEF 122, the management of the TSCAI can be performed by the NEF 122 in the same way as in the case of the untrusted AF, and for "TSC Assistance Container" Management and creation may also be performed by the NEF 122 .

8 is a block diagram illustrating a computing device according to an embodiment of the present invention.

Referring to FIG. 8 , the computing device 50 is a network entity of a 5G system, for example, UE, DS-TT, UPF, NW-TT, RAN, TSN AF, PCF, SMF, AMF, UDM and NEF. can be implemented. In addition, the method for supporting trusted AF of the 5G system for a time-sensitive service according to embodiments of the present invention may be implemented using the computing device 50 .

The computing device 50 includes at least one of a processor 510 , a memory 530 , a user interface input device 540 , a user interface output device 550 , and a storage device 560 in communication via a bus 520 . can do. Computing device 50 may also include network interface 570 electrically connected to network 40 , such as a wireless network. Network interface 570 may transmit or receive signals with other network entities, eg, SMF 114 , via network 40 .

The processor 510 may be implemented in various types such as an application processor (AP), a central processing unit (CPU), a graphic processing unit (GPU), and the like, and executes a command stored in the memory 530 or the storage device 560 . It may be any semiconductor device that does The processor 510 may be configured to implement the functions and methods described with respect to FIGS. 1-6 .

The memory 530 and the storage device 560 may include various types of volatile or non-volatile storage media. For example, the memory may include a read-only memory (ROM) 531 and a random access memory (RAM) 532 . In an embodiment of the present invention, the memory 530 may be located inside or outside the processor 510 , and the memory 530 may be connected to the processor 510 through various known means.

In addition, the method for predicting a network state according to embodiments of the present invention may be implemented as a program or software executed in the computing device 50, and the program or software may be stored in a computer-readable medium.

In addition, the method for predicting a network state according to embodiments of the present invention may be implemented as hardware capable of being electrically connected to the computing device 50 .

According to the embodiments of the present invention described so far, trust AF as well as untrusted AF can request a time-sensitive service provided by the 5G system. Services can be provided through direct communication within the system.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and common knowledge in the technical field to which the present invention pertains using the basic concept of the present invention defined in the following claims Various modifications and improved forms of those with

Claims (1)

As a reliable application function (AF) support method of 5G system for time-sensitive service,
requesting, by the trusted AF, TSC Assistance Information (TSCAI), Deterministic QoS (QoS), and time synchronization information from a Policy Control Function (PCF); and
The PCF is transmitted to a Session Management Function (SMF) and applied to a Protocol Data Unit (PDU) session,
The trust AF communicates with the PCF using an Npcf_PolicyAuthorization service interface.

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