Network device, radio system, data collection method, and computer program

Abstract

To improve the efficiency of collection of App-D of UE, QoS control, and the like.SOLUTION: A network device comprises: an App-D request reception part that receives an application layer data request for acquiring an application layer data from a user terminal device related to a network data analysis to be requested by NWDAF; a NAS message transmission request transmission part that transmits a NAS message transmission request for transmitting a first NAS message for instructing a transfer of the application layer data to the user terminal device to an AMF; and an App-D reception part that receives the application layer data transferred from the user terminal device in accordance with the first NAS message from the AMF.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a network device, a wireless system, a data collection method, and a computer program. [Background technology]

[0002] Conventionally, a fifth generation mobile communication system (5G system) standardized by the "3rd Generation Partnership Project" has been known (see, for example, Non-Patent Documents 1-4). FIG. 9 is a diagram showing a schematic architecture of a 5G system. In FIG. 9, the 5G system is composed of a UE (User Equipment), a RAN (Radio Access Network), a CN (Core Network), and the like.

[0003] The CN is composed of NFs (Network Functions) of the control plane (C-plane), such as the AMF (Access and Mobility Management Function), UDM (Unified Data Management), and NWDAF (Network Data Analytics Function). In the 5G system, the NWDAF collects and analyzes data from NFs of the 5G Core Network (5GC). For example, network analysis is performed by collecting Application Layer Data (App-D) of the UE (User Equipment).

[0004] Non-Patent Document 3 describes an App-D collection method using a C-plane as a method for collecting App-D of a UE. Non-Patent Document 2 describes an App-D collection method using a user plane (U-plane) as a method for collecting App-D of a UE.

[0005] Non-Patent Document 4 also describes how to handle NAS (Non-Access-Stratum) messages, App-MR (Application Layer Measurement Report), and the like in the RRC (Radio Resource Control) layer. For example, it describes how to use multiple types of SRBs (Signaling Radio Bearers). [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] 3GPP, TS 23.501, V18.2.2, 2023-07 [Non-Patent Document 2] 3GPP, TS 23.288, V18.2.0, 2023-06 [Non-Patent Document 3] 3GPP, TS 23.405, V18.3.0, 2023-06 [Non-Patent Document 4] 3GPP, TS 23.331, V17.5.0, 2023-06 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the App-D collection method using the C-plane described in Non-Patent Document 3, messages that do not need to be interpreted in the RAN must be interpreted and converted in the RAN, which is inefficient. Also, in the App-D collection method using the U-plane described in Non-Patent Document 2, App-D is collected using a route that passes through a DN (Data Network) that exists outside the operator-managed domain, so end-to-end QoS (Quality of Service) control is not possible.

[0008] Furthermore, the method of using a plurality of types of SRBs as described in Non-Patent Document 4 was sometimes insufficient in prioritizing NAS messages and the like.

[0009] The present invention has been made in consideration of the above circumstances, and has an object to improve the efficiency of App-D collection by a UE, QoS control, and the like. [Means for solving the problem]

[0010] One aspect of the present invention is a network device comprising: an App-D request receiving unit that receives an application layer data request to acquire application layer data from a user terminal device related to a network data analysis requested by an NWDAF (Network Data Analytics Function); a NAS message transmission request sending unit that sends a NAS message transmission request to an AMF (Access and Mobility Management Function) to send a first NAS (Non-Access-Stratum) message to the user terminal device instructing the transfer of application layer data; and an App-D receiving unit that receives application layer data transferred from the user terminal device in response to the first NAS message from the AMF. One aspect of the present invention is a network device in which, in the above-mentioned network device, the NAS message transmission request includes available QoS information in a QoS identifier of an IE (Information Element) of the first NAS message referenced by the radio access network to which the user terminal device is connected.

[0011] One aspect of the present invention is a network device having an Access and Mobility Management Function (AMF), comprising: a NAS message sending unit that sends a first Non-Access-Stratum (NAS) message to a user terminal device instructing the transfer of application layer data; and a NAS message receiving unit that receives a second NAS message sent from the user terminal device, the second NAS message including application layer data to be transferred from the user terminal device in response to the first NAS message. One aspect of the present invention is a network device in which a QoS identifier referenced by the radio access network to which the user terminal device is connected is provided as an IE (Information Element) of NAS signaling regarding the first NAS message.

[0012] One aspect of the present invention is a wireless system comprising: an App-D request receiving unit that receives an application layer data request to obtain application layer data from a user terminal device related to a network data analysis requested by an NWDAF (Network Data Analytics Function); a NAS message transmission request transmitting unit that transmits a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device instructing the transfer of application layer data; an App-D receiving unit that receives application layer data transferred from the user terminal device in response to the first NAS message from the AMF; and the AMF that transmits the first NAS message to the user terminal device in response to the NAS message transmission request and receives a second NAS message sent from the user terminal device, the second NAS message including application layer data transferred from the user terminal device in response to the first NAS message. One aspect of the present invention is a wireless system in which, in the above-mentioned wireless system, the NAS message transmission request includes available QoS information in a QoS identifier of an IE (Information Element) of the first NAS message referenced by the wireless access network to which the user terminal device is connected. One aspect of the present invention is a wireless system in which a QoS identifier referenced by the wireless access network to which the user terminal device is connected is provided as an IE (Information Element) of NAS signaling related to the first NAS message.

[0013] One aspect of the present invention is a data collection method executed by a wireless system, the data collection method including: an App-D request receiving step of receiving an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by an NWDAF (Network Data Analytics Function); a NAS message transmission request transmitting step of transmitting a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device instructing the transfer of application layer data; a NAS message transmitting step of the AMF transmitting the first NAS message to the user terminal device in response to the NAS message transmission request; a NAS message receiving step of the AMF receiving a second NAS message, the second NAS message being a NAS message transmitted from the user terminal device and including application layer data to be transferred from the user terminal device in response to the first NAS message; and an App-D receiving step of receiving from the AMF the application layer data transferred from the user terminal device in response to the first NAS message.

[0014] One aspect of the present invention is a computer program for causing a computer to execute an App-D request receiving step of receiving an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by an NWDAF (Network Data Analytics Function), a NAS message transmission request sending step of sending to an AMF (Access and Mobility Management Function) a NAS message transmission request for sending to the user terminal device a first NAS (Non-Access-Stratum) message instructing the transfer of application layer data, and an App-D receiving step of receiving from the AMF the application layer data transferred from the user terminal device in response to the first NAS message.

[0015] One aspect of the present invention is a computer program for causing a computer realizing AMF (Access and Mobility Management Function) to execute a NAS message sending step of sending a first NAS (Non-Access-Stratum) message to a user terminal device instructing the transfer of application layer data, and a NAS message receiving step of receiving a second NAS message sent from the user terminal device, the second NAS message including application layer data to be transferred from the user terminal device in response to the first NAS message. Effect of the Invention

[0016] According to the present invention, it is possible to obtain an effect of improving the efficiency of App-D collection of a UE, QoS control, and the like. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 illustrates a schematic architecture of a wireless system according to an embodiment. [Diagram 2]1 is a block diagram showing a schematic configuration example of a network device according to an embodiment; [Diagram 3] 1 is a block diagram showing a schematic configuration example of a network device according to an embodiment; [Figure 4] FIG. 11 is a sequence diagram showing an example of a procedure of a data collection method according to an embodiment. [Diagram 5] FIG. 11 is a sequence diagram showing an example of a procedure for an SRB establishment method according to one embodiment. [Figure 6] FIG. 11 is a sequence diagram showing an example of a procedure for an SRB establishment method according to one embodiment. [Figure 7] FIG. 11 is a sequence diagram showing an example of a procedure for an SRB establishment method according to one embodiment. [Figure 8] FIG. 11 is a sequence diagram showing an example of a procedure for an SRB establishment method according to one embodiment. [Figure 9] FIG. 1 is a diagram showing a schematic architecture of a conventional 5G system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a diagram showing a schematic architecture of a wireless system according to an embodiment. In the wireless system 1 shown in Fig. 1, an NWDAF-APP is further added as a NF of a C-plane of a CN in a 5G system shown in Fig. 9. Note that the NWDAF-APP may be included in the NWDAF as a part of the NWDAF.

[0019] Fig. 2 is a block diagram showing a schematic configuration example of a network device 100 according to this embodiment. The network device 100 shown in Fig. 2 is a device compatible with the NWDAF-APP. In Fig. 2, the network device 100 includes an App-D request receiving unit 101, a NAS message transmission request transmitting unit 102, an App-D receiving unit 103, and an App-D forwarding unit 104.

[0020] Each function of the network device 100 is realized by the network device 100 including computer hardware such as a CPU (Central Processing Unit) and a memory, and the CPU executing a computer program stored in the memory. The network device 100 may be configured using a general-purpose computer device, or may be configured as a dedicated hardware device. For example, the network device 100 may be configured using a server computer connected to a communication network such as the Internet. Each function of the network device 100 may be realized by cloud computing. The network device 100 may be realized by a single computer, or may be realized by distributing the functions of the network device 100 among multiple computers.

[0021] The App-D request receiving unit 101 receives a request (application layer data request (App-D request)) to obtain application layer data (App-D) from a user terminal device (UE) related to network data analysis requested by the NWDAF (network data analysis function).

[0022] The NAS message transmission request sending unit 102 sends a request (NAS message transmission request) to the AMF to send a NAS message (first NAS message) instructing the transfer of App-D (App-DT (Application Layer Data Transfer)) to a UE related to the network data analysis.

[0023] The App-D receiving unit 103 receives the App-D transferred from the UE in response to the first NAS message from the AMF. The App-D forwarding unit 104 forwards the App-D received from the AMF to the NWDAF. Note that, when the NWDAF-APP is included in the NWDAF as a part of the NWDAF, the App-D forwarding unit 104 is not required.

[0024] FIG. 3 is a block diagram showing a schematic configuration example of a network device 200 according to this embodiment. The network device 200 shown in FIG. 3 is a device corresponding to the AMF in a conventional 5G system. In this embodiment, a change is made to the AMF in the conventional 5G system. FIG. 3 shows the addition and change from the AMF in the conventional 5G system.

[0025] 3, the network device 200 includes a NAS message transmission request receiving unit 201, a NAS message transmitting unit 202, a NAS message receiving unit 203, an App-D transmitting unit 204, and an NGAP message transmitting unit 205.

[0026] Each function of the network device 200 is realized by the network device 200 including computer hardware such as a CPU (Central Processing Unit) and a memory, and the CPU executing a computer program stored in the memory. The network device 200 may be configured using a general-purpose computer device, or may be configured as a dedicated hardware device. For example, the network device 200 may be configured using a server computer connected to a communication network such as the Internet. Each function of the network device 200 may be realized by cloud computing. The network device 200 may be realized by a single computer, or may be realized by distributing the functions of the network device 200 among multiple computers.

[0027] The NAS message transmission request receiver 201 receives a NAS message transmission request from the network device 100 .

[0028] The NAS message transmitting unit 202 transmits a NAS message (first NAS message) instructing the UE to transfer App-D. The NAS message receiving unit 203 receives a NAS message (second NAS message) transmitted from the UE and including App-D transferred from the UE in response to the first NAS message. The App-D transmitting unit 204 transmits the App-D transferred from the UE to the network device 100.

[0029] The NGAP message transmission unit 205 transmits a Next Generation Application Protocol (NGAP) message to a Radio Access Network (RAN).

[0030] Next, a data collection method executed by the wireless system 1 according to this embodiment will be described with reference to Fig. 4. Fig. 4 is a sequence diagram showing an example of the procedure of the data collection method according to this embodiment.

[0031] (Step S1) An NFc, which is an arbitrary NF, requests the NWDAF for network data analysis. This request for network data analysis requires information for determining a target UE, which is a UE or a group of UEs related to the network data analysis, and may include, for example, an identifier of the target UE (e.g., SUPI, etc.). In response to the request for network data analysis, the NWDAF determines whether or not it is necessary to collect App-D of the target UE. If it is necessary to collect App-D of the target UE as a result of this determination, the subsequent steps are executed, whereas if it is not necessary to collect App-D of the target UE, the process of FIG. 4 is terminated.

[0032] (Steps S2, S3) The NWDAF requests information about the AMF in which the target UE resides from the UDM and obtains the information about the AMF from the UDM.

[0033] (Step S4) The NWDAF transmits a request (App-D request) to acquire App-D from the target UE to the NWDAF-APP (network device 100). The NWDAF-APP (App-D request receiver 101) receives the App-D request from the NWDAF. The App-D request includes an identifier of the target UE and information on the AMF in which the target UE resides. The App-D request corresponds to a request of App-DT.

[0034] (Steps S5-S8) The NWDAF-APP communicates with the UDM in a predetermined procedure and checks the UE consent information for the App-DT of the target UE. If the result of this check is that the UE consent information is not obtained or the App-DT is rejected, the process of Fig. 4 is terminated, whereas if not, the process of Fig. 4 is continued.

[0035] The NWDAF-APP determines whether to execute the following steps according to the analysis request time and requested quality regarding the App-D request from the NWDAF, and the consent status of the target UE in the UE consent information. If the result of this determination is that the following steps are not to be executed, the process of FIG. 4 is terminated, whereas if not, the following steps are executed.

[0036] (Step S9) The NWDAF-APP (NAS message transmission request transmitter 102) transmits a NAS message transmission request to the AMF (network device 200) in which the target UE resides. This NAS message transmission request is a request to issue an App-DT instruction to the target UE using a NAS message in the downlink (downlink (DL)) link (direction from the AMF to the UE). In addition, the signaling related to the NAS message transmission request may include an identifier indicating the QoS of the NAS signaling in the App-DT instruction from the AMF to the target UE, an identifier indicating the QoS of the NAS signaling in the App-DT from the target UE to the AMF, and the like.

[0037] The AMF (NAS message transmission request receiving unit 201) receives a NAS message transmission request from the NWDAF-APP.

[0038] (Step S10) The AMF (NAS message transmission unit 202) transmits a NAS message (first NAS message) instructing App-DT to the target UE. At this time, the AMF may execute a NAS signaling process for the RAN to which the target UE is connected to distinguish the first NAS message from other NAS messages and set an appropriate QoS. Specifically, the AMF adds an identifier indicating QoS (QoS identifier) ​​to an IE (Information Element) of an NGAP header of a "DL NAS TRANSFER message" in the NGAP layer. The RAN applies the QoS indicated by the QoS identifier of the IE of the NGAP header of the "DL NAS TRANSFER message" to the first NAS message. The QoS identifier may be included in a NAS message transmission request and notified to the AMF.

[0039] The target UE receives a first NAS message from the AMF via the RAN to which it is connected.

[0040] (Step S11) The target UE stores the App-D indicated in the first NAS message in a NAS message (second NAS message) and transmits the second NAS message to the AMF. At this time, the target UE may assign an appropriate priority to the second NAS message in the RRC (Radio Resource Control) layer.

[0041] The AMF (NAS message receiving unit 203) receives the second NAS message from the target UE.

[0042] (Step S12) The AMF (App-D transmitter 204) transmits the App-D stored in the second NAS message received from the target UE to the NWDAF-APP. The NWDAF-APP (App-D receiver 103) receives the App-D.

[0043] (Step S13) The NWDAF-APP (App-D forwarding unit 104) forwards the App-D received from the AMF to the NWDAF.

[0044] (Step S14) The NWDAF performs the network data analysis requested by the NFc based on the App-D of the target UE received from the NWDAF-APP, and transmits the analysis result to the NFc.

[0045] According to this embodiment, App-D of the UE can be collected by using a NAS message. The NAS message is a message exchanged in the NAS between the UE and the AMF. Therefore, the RAN does not need to interpret the payload of the NAS message. In addition, the NAS message is a message between the UE and the AMF, that is, a message of the C-plane. Therefore, QoS control in the C-plane can be applied to the NAS message. As a result, according to this embodiment, it is possible to obtain an effect of improving the efficiency of collection of App-D of the UE and QoS control.

[0046] Next, a method for dynamically prioritizing NAS signaling according to this embodiment will be described.

[0047] Non-patent document 4 describes how NAS messages are handled in the RRC layer. This point will be explained. When communicating NAS messages between the RAN and the UE, an SRB (Radio Bearer for Signaling) is used in the RRC layer. Two types of SRBs (referred to as SRB1 and SRB2, respectively) that can be used by NAS messages are defined. At most, one SRB1 and one SRB2 are assigned to one UE. For example, one SRB of SRB1 and one SRB of SRB2 can be assigned to one UE, but two or more SRBs of either SRB1 or SRB2 cannot be assigned to one UE.

[0048] SRB1 and SRB2 are used depending on whether "AS (Access Stratum) security" is enabled between the UE and the network. Specifically, SRB1 is used before "AS security" is enabled (for example, at the time of initial access, etc.), and SRB2 is used after "AS security" is enabled. Based on this method of use, different priorities can be assigned to SRB1 and SRB2. Specifically, it is recommended to assign the highest priority to SRB1 and a medium priority to SRB2. That is, in Non-Patent Document 4, the priority of the NAS message in the RRC layer is determined only by whether "AS security" is enabled, and the operator cannot flexibly change it depending on the content of the NAS message.

[0049] Also, Non-Patent Document 4 describes how APP-MR is handled in the RRC layer. This point will be explained. RRC messages for collecting App-D of a UE are standardized, and among them, a message used when actually transmitting App-D from a UE to a network is called APP-MR. SRB4 is used in the RRC layer for APP-MR, while SRB0, SRB1, SRB2, and SRB3 are used for other RRC messages. The priority of SRB4 can be differentiated compared to other SRBs (i.e., SRB0, SRB1, SRB2, and SRB3).

[0050] Here, in the above-described method for collecting App-D of a UE according to the present embodiment, the App-D of the UE is collected using a NAS message, but it is preferable to flexibly differentiate the priority of the NAS message (the first NAS message and the second NAS message) used for collecting App-D of the UE from the priority of the NAS message used for purposes other than collecting App-D of the UE, thereby appropriately prioritizing each NAS message. For example, it is preferable to give a higher priority to a NAS message (e.g., PDU session activation, etc.) that is essential for communication between the UE and the CN than a NAS message (the first NAS message and the second NAS message) used for collecting App-D of the UE.

[0051] The SRB establishment method according to this embodiment will be described below.

[0052] [RAN-initiated method] 5 and 6 are sequence diagrams showing an example of the procedure of an SRB establishment method according to the RAN-initiated method.

[0053] The procedure for enabling an SRB will be described with reference to FIG. In advance, normal NAS messages (i.e., NAS messages used for purposes other than collecting the UE's App-D) can be exchanged between the UE and the CN's NF (e.g., AMF, etc.).

[0054] (Step S101) The AMF (NGAP message sending unit 205) identifies the RAN (serving RAN) in which the target UE is located, and sends a NAS establishment request (NGAP message) to the serving RAN to establish a NAS (NAS_X) for the target UE to transfer App-D.

[0055] In addition, step S101 executed by the AMF may be initiated by the AMF itself, by signaling from another NF, or by NAS signaling from the target UE.

[0056] (Step S102) In response to the NAS establishment request, the serving RAN transmits "RRC Reconfiguration" signaling to the target UE. The "RRC Reconfiguration" signaling requests the target UE to establish an SRB (SRB_X) for transmitting NAS messages (the first NAS message and the second NAS message) in NAS_X by prioritizing the SRB according to a predetermined priority setting condition.

[0057] In addition, step S102 executed by the RAN may be initiated by the serving RAN without signaling from the AMF. Specifically, the serving RAN may execute step S102 when receiving a NAS message (first NAS message) corresponding to SRB_X from the AMF. In this case, the first NAS message corresponds to a NAS establishment request.

[0058] (Step S103) The target UE transmits "RRC Reconfiguration Complete" signaling to the serving RAN. The "RRC Reconfiguration Complete" signaling notifies the serving RAN that the SRB_X has been established with priority according to a predetermined priority setting condition.

[0059] The procedure for invalidating an SRB will be described with reference to FIG.

[0060] (Step S111) The AMF (NGAP message sending unit 205) identifies the RAN (serving RAN) in which the target UE is located, and sends a NAS discard request (NGAP message) to the serving RAN to discard the NAS (NAS_X) for the target UE to transfer App-D.

[0061] In addition, step S111 executed by the AMF may be initiated by the AMF itself, by signaling from another NF, or by NAS signaling from the target UE.

[0062] (Step S112) In response to the NAS discard request, the serving RAN transmits "RRC Reconfiguration" signaling to the target UE. The "RRC Reconfiguration" signaling requests the target UE to discard the SRB (SRB_X) for transmitting the NAS messages (the first NAS message and the second NAS message) in NAS_X.

[0063] In addition, step S112 executed by the RAN may be initiated by the serving RAN without signaling from the AMF. Specifically, the serving RAN may execute step S112 when a NAS message (first NAS message) corresponding to SRB_X is not received from the AMF for a certain period of time.

[0064] (Step S113) The target UE transmits "RRC Reconfiguration Complete" signaling to the serving RAN. The "RRC Reconfiguration Complete" signaling notifies the serving RAN that the SRB_X has been discarded.

[0065] [UE-initiated method] 7 and 8 are sequence diagrams showing an example of the procedure of an SRB establishment method according to the UE-initiated method.

[0066] The procedure for enabling an SRB will be described with reference to FIG. In advance, normal NAS messages (i.e., NAS messages used for purposes other than collecting the UE's App-D) can be exchanged between the UE and the CN's NF (e.g., AMF, etc.).

[0067] (Step S201) The AMF (NAS message transmitting unit 202) transmits to the target UE a NAS establishment request (NAS message) for establishing a NAS (NAS_X) for the target UE to transfer App-D.

[0068] In addition, step S201 executed by the AMF may be initiated by the AMF itself, by signaling from another NF, or by NAS signaling from the target UE.

[0069] (Step S202) In response to the NAS establishment request, the target UE transmits, by RRC signaling, an SRB establishment request for establishing an SRB (SRB_X) for transmitting a NAS message in NAS_X to the RAN (serving RAN) to which the target UE is connected.

[0070] Note that step S202 executed by the target UE may be started by the target UE without signaling from the AMF. For example, the target UE may start step S202 when it becomes necessary to notify the CN of App (Application Layer) information in the target UE. Specifically, when the remaining battery level of the target UE becomes sufficient to be equal to or higher than a certain level due to charging, it becomes possible to notify information.

[0071] (Step S203) In response to the SRB establishment request, the serving RAN transmits "RRC Reconfiguration" signaling to the target UE. The "RRC Reconfiguration" signaling requests the target UE to establish an SRB (SRB_X) for transmitting NAS messages (the first NAS message and the second NAS message) in NAS_X by prioritizing the SRB according to a predetermined priority setting condition.

[0072] (Step S204) The target UE transmits "RRC Reconfiguration Complete" signaling to the serving RAN. The "RRC Reconfiguration Complete" signaling notifies the serving RAN that the SRB_X has been established with priority according to a predetermined priority setting condition.

[0073] The procedure for invalidating an SRB will be described with reference to FIG.

[0074] (Step S211) The AMF (NAS message transmitting unit 202) transmits to the target UE a NAS discard request (NAS message) for discarding the NAS (NAS_X) for the target UE to transfer App-D.

[0075] In addition, step S211 executed by the AMF may be initiated by the AMF itself, by signaling from another NF, or by NAS signaling from the target UE.

[0076] (Step S212) In response to the NAS discard request, the target UE transmits, by RRC signaling, an SRB discard request for discarding an SRB (SRB_X) for transmitting a NAS message in NAS_X to the RAN (serving RAN) to which the target UE is connected.

[0077] In addition, step S212 executed by the target UE may be started by the target UE without signaling from the AMF. For example, when it becomes necessary to stop notifying the CN of App information in the target UE, the target UE may start step S212. Specifically, when the remaining battery level of the target UE becomes less than a certain level, etc.

[0078] (Step S213) In response to the SRB discard request, the serving RAN transmits "RRC Reconfiguration" signaling to the target UE. The "RRC Reconfiguration" signaling requests the target UE to discard the SRB (SRB_X) for transmitting the NAS messages (the first NAS message and the second NAS message) in NAS_X.

[0079] (Step S214) The target UE transmits "RRC Reconfiguration Complete" signaling to the serving RAN. The "RRC Reconfiguration Complete" signaling notifies the serving RAN that the SRB_X has been discarded.

[0080] Next, an example of a priority setting condition for prioritizing an SRB (SRB_X) for transmitting NAS messages (first NAS message and second NAS message) in NAS_X is shown below.

[0081] (Example 1 of priority setting conditions) Example 1 of the priority setting condition is the priority indicated by the AMF.

[0082] (Example 2 of priority setting conditions) The priority setting condition example 2 has a lower priority than the SRB required for the communication already established with the target UE. The SRB required for the communication already established with the target UE is, for example, SRB2. A specific example is shown below.

[0083] (Example 1) The priority is the same as that of SRB4 already established for the target UE. SRB4 has a lower priority than SRB2.

[0084] (Example 2) The priority is equal to the "default priority" of any SRB that has not yet been established in the target UE. The priority equal to the "default priority" of an SRB is lower than SRB2.

[0085] (Example 3) The priority is the same as that of an SRB4 that has not yet been established for the target UE. SRB4 has a lower priority than SRB2.

[0086] (Example 4) The priority is the same as that of one of the DRBs (Data Radio Bearers) already established in the target UE. A priority equal to that of a DRB (Data Radio Bearer) has a lower priority than SRB2.

[0087] (Example 5) The priority is equal to the "default priority" of any DRB that has not yet been established for the target UE. The priority equal to the "default priority" of a DRB is lower than SRB2.

[0088] According to this embodiment, it is possible to flexibly differentiate between the priority of the NAS message (the first NAS message and the second NAS message) used for collecting App-D of the UE and the priority of the NAS message used for purposes other than collecting App-D of the UE, and it is possible to appropriately prioritize each NAS message. For example, a NAS message (e.g., PDU session activation, etc.) essential for communication between the UE and the CN can be given a higher priority than a NAS message (the first NAS message and the second NAS message) used for collecting App-D of the UE.

[0089] This will, for example, make it possible to improve the overall service quality in wireless networks, thereby contributing to Goal 9 of the United Nations-led Sustainable Development Goals (SDGs), which is to "Build resilient infrastructure, promote sustainable industrialization and foster innovation."

[0090] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not deviate from the gist of the present invention are also included.

[0091] In addition, a computer program for implementing the functions of each of the above-mentioned devices may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed. Note that the "computer system" referred to here may include hardware such as an OS and peripheral devices. In addition, the term "computer-readable recording medium" refers to writable non-volatile memory such as a flexible disk, an optical magnetic disk, a ROM, or a flash memory, a portable medium such as a DVD (Digital Versatile Disc), or a storage device such as a hard disk built into a computer system.

[0092] Furthermore, the term "computer-readable recording medium" includes devices that retain a program for a certain period of time, such as volatile memory (e.g., DRAM (Dynamic Random Access Memory)) within a computer system that serves as a server or client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. The program may be transmitted from a computer system in which the program is stored in a storage device or the like to another computer system via a transmission medium, or by a transmission wave in the transmission medium. Here, the "transmission medium" that transmits the program refers to a medium that has a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for implementing some of the functions described above, or may be a so-called differential file (differential program) that can implement the functions described above in combination with a program already recorded in the computer system. [Explanation of symbols]

[0093] 1...wireless system, 100...network device (NWDAF-APP), 101...App-D request receiving unit, 102...NAS message transmission request transmitting unit, 103...App-D receiving unit, 104...App-D forwarding unit, 200...network device (AMF), 201...NAS message transmission request receiving unit, 202...NAS message transmitting unit, 203...NAS message receiving unit, 204...App-D transmitting unit, 205...NGAP message transmitting unit

Claims

1. an App-D request receiving unit that receives an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by a NWDAF (Network Data Analytics Function); a NAS message transmission request transmission unit that transmits a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device, the first NAS message instructing the transfer of application layer data; An App-D receiving unit that receives application layer data transferred from the user terminal device in response to the first NAS message from the AMF; A network device comprising:

2. The NAS message transmission request includes available QoS information in a QoS identifier of an information element (IE) of the first NAS message referenced by the radio access network to which the user terminal device is connected; The network device according to claim 1 .

3. In a network device having an access and mobility management function (AMF), a NAS message sending unit that sends a first NAS (Non-Access-Stratum) message instructing a transfer of application layer data to a user terminal device; a NAS message receiving unit that receives a second NAS message, the second NAS message including application layer data transferred from the user terminal in response to the first NAS message; A network device comprising:

4. A QoS identifier referred to by a radio access network to which the user terminal device is connected is provided as an information element (IE) of a NAS signaling related to the first NAS message; The network device according to claim 3.

5. an App-D request receiving unit that receives an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by a NWDAF (Network Data Analytics Function); a NAS message transmission request transmission unit that transmits a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device, the first NAS message instructing the transfer of application layer data; An App-D receiving unit that receives application layer data transferred from the user terminal device in response to the first NAS message from the AMF; The AMF transmits the first NAS message to the user terminal in response to the NAS message transmission request, and receives a second NAS message transmitted from the user terminal, the second NAS message including application layer data forwarded from the user terminal in response to the first NAS message; A wireless system comprising:

6. The NAS message transmission request includes available QoS information in a QoS identifier of an information element (IE) of the first NAS message referenced by the radio access network to which the user terminal device is connected; 6. The wireless system according to claim 5.

7. A QoS identifier referred to by a radio access network to which the user terminal device is connected is provided as an information element (IE) of a NAS signaling related to the first NAS message; 7. A wireless system according to claim 5 or 6.

8. 1. A data collection method implemented by a wireless system, comprising: an App-D request receiving step of receiving an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by a NWDAF (Network Data Analytics Function); a NAS message transmission request transmission step of transmitting a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device, the NAS message transmission request instructing the transfer of application layer data; A NAS message sending step in which the AMF sends the first NAS message to the user terminal in response to the NAS message sending request; A NAS message receiving step in which the AMF receives a second NAS message, the second NAS message including application layer data transmitted from the user terminal in response to the first NAS message; An App-D receiving step of receiving application layer data transferred from the user terminal device in response to the first NAS message from the AMF; Data collection methods, including:

9. On the computer, an App-D request receiving step of receiving an application layer data request for acquiring application layer data from a user terminal device related to a network data analysis requested by a NWDAF (Network Data Analytics Function); a NAS message transmission request transmission step of transmitting a NAS message transmission request to an AMF (Access and Mobility Management Function) to transmit a first NAS (Non-Access-Stratum) message to the user terminal device, the NAS message transmission request instructing the transfer of application layer data; An App-D receiving step of receiving application layer data transferred from the user terminal device in response to the first NAS message from the AMF; A computer program for executing the above.

10. A computer that realizes AMF (Access and Mobility Management Function) a NAS message transmission step of transmitting a first NAS (Non-Access-Stratum) message instructing a transfer of application layer data to a user terminal device; a NAS message receiving step of receiving a second NAS message, the second NAS message including application layer data transferred from the user terminal in response to the first NAS message; A computer program for executing the above.

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