Lightweight 5G private network charging method

Abstract

The invention discloses a lightweight 5G private network charging method, and belongs to the technical field of communication. A lightweight charging solution is provided for a 5G private network core network self-built in the vertical industry, according to the demand characteristics of government and enterprise industry users, calculation of network resource occupation rate by user individuals is not concerned, statistics of distribution of session traffic in time, place and interface flow directions is emphasized according to service types, an OMC system and a BOSS system are fused, and the cost is reduced. Therefore, capacity expansion and shrinkage adjustment is performed on private network resources in a targeted manner, priorities of different service types are adjusted, and service tidal effects in different time periods are managed and controlled, so that resource configuration is optimized, and production efficiency is better improved.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and specifically relates to a lightweight 5G private network billing method. Background Art

[0002] Usually the operator network 5G network consists of Figure 1 It is composed of complete network elements, among which OMC is the network management system, which focuses on monitoring and maintaining the communication network and statistically analyzing the network operation quality; the CHF billing function unit generates call records, and the BOSS queries and counts user call records, focusing on controlling personal packages and rates of users.

[0003] However, vertical industry 5G private networks usually do not have a billing system (such as Figure 2 As shown in the figure, the core network only has a few necessary network elements, and only a simple network management OMC is used to set network service parameters, activate and set user number authentication information, and observe network equipment alarms. The virtual private network arranged by the operator in a sliced ​​manner does not open the billing system and network management system to vertical industry government and enterprise users. Therefore, the vertical industry 5G private network has no billing function or incomplete functions and cannot meet application requirements. Summary of the invention

[0004] To solve the above problems, the present invention discloses a lightweight 5G private network billing method. The present invention provides a lightweight billing solution for vertical industries to build their own 5G private network core network. According to the needs of government and enterprise industry users, it does not focus on the calculation of network resource occupancy rates by individual users, but focuses on the distribution of session traffic in time, location, and interface flow direction according to business types, and integrates OMC and BOSS systems, so as to adjust the expansion and contraction of private network resources in a targeted manner, adjust the priorities of different business types, and manage the business tidal effects in different time periods, so as to optimize resource allocation and better improve production efficiency.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A lightweight 5G private network billing method includes the following steps: Step 1: Perform network parameter configuration and user configuration; Step 2: Establishing a session, triggering a billing event, and creating a call record; including the following sub-steps: Step 2-1, the network element sends a request to create a packet unit session to the SMF module, and the SMF sends a session creation response message to the network element to establish a session. The SMF caches the ARP in the QoS list in the response message; Step 2-2, the SMF module selects the appropriate UPF according to the service type and interacts with the UPF for data; the SMF sends a PFCP association creation request to the UPF, the UPF sends a PFCP establishment response message to the SMF, and the SMF caches the UPF node number in the response message; Step 2-3, the SMF module sends a billing event notification to the billing network element CHF, CHF records the session process, forms a CDR record, and then assembles it into a call record file according to the format standard, and CHF sends a billing data creation response to SMF; when creating a new billing call record, CHF fills in the ARP and UPF fields in the CDR record; Step 3, when the session is modified, update the call record; including the following sub-steps: Step 3-1, use the network element and SMF module to send the relevant request and response messages for session modification, and cache the ARP in the QoS list in the response message each time the session is established; Step 3-2, the SMF module selects a suitable UPF according to the business-related type, and interacts with the UPF for data. The SMF sends a PFCP association creation request to the UPF, and the UPF sends a PFCP establishment response message to the SMF. When the PFCP establishes a response, the UPF node number in the response message is cached; Step 3-3, the SMF module initiates a billing event notification to the billing network element CHF, CHF updates the CDR record file, and CHF sends a billing data update response to the SMF; Step 4: After the session ends, the session is released, the call record is saved, and the billing ends; Step 5: After cleaning, the conversation data is converted into a format suitable for database storage and stored in the database; Step 6: Aggregate call record data based on the database for query; Step 7, intelligent operation and maintenance, including: Call statistics query, used to query by time and single user number, as well as fuzzy query by ARP, DNN, UPF and user number segment, and supports query conditions containing a single wildcard "?", indefinite length wildcard "*", start and end numbers; Threshold setting is used to set the upper limit, lower limit, validity period, statistical object and type. When the traffic query of a certain dimension exceeds the threshold, the statistical data will be displayed in red; Threshold alarm setting is used to open, close, and set the alarm level. When the call bill aggregation result exceeds the threshold, it is sent to the alarm management agent via a RESTFUL message. The alarm can be confirmed, manually eliminated, and commented. When it returns to within the threshold value, the alarm is automatically eliminated. The automatic adjustment mode setting is used to set automatic adjustment tasks according to pre-set rules. When the triggering conditions of the rules are met, the adjustment objects and adjustment parameters in the rules are obtained to generate human-machine interface commands, which are automatically issued and executed in network management.

[0006] Furthermore, the session creation response message includes: session type, continuity mode, QoS flow list, and terminal IP address.

[0007] Furthermore, the PFCP establishment response message includes: UPF node number, reason value, and user plane session number.

[0008] Furthermore, when UPF reports the utilization report to SMF, CHF is triggered by CTP to update and insert the ARP and UPF fields, and the cache storing ARP and UPF is released at the same time; the ARP and UPF fields are obtained through the following process: CHF matches the ARP cached in step 2-1 according to the session number, and associates the UPF node number cached in step 2-2 with the configuration data in the network management according to the session number, and associates and obtains the UPF name.

[0009] Further, when the preset conditions are met, ARP and / UPF are updated when CHF updates the CDR record file in step 3-3.

[0010] Furthermore, when the 5G-LAN function of the UPF in the network management is turned on, the VN-GROUP field is recorded in the call record, and the VN-GROUP to which the SUPI number belongs in the network management is consistent with the call record.

[0011] The beneficial effects of the present invention are: The present invention does not rely on the operator's huge network management OMC and billing BOSS system. Based on the vertical industry private network, the CHF network element is added to the self-built 5GC core network, and the heavyweight OMC is customized. It can realize the traffic query and analysis function for the service deployment mode and batch terminals, so as to optimize and adjust the service mode settings and terminal contract data. It can realize the autonomous operation and maintenance of the vertical industry private network, optimize resource allocation, improve production efficiency, tap the potential business carrying capacity of the communication private network, and optimize and adjust the production process to achieve a better user experience.

[0012] The present invention adds VN-GROUP, ARP, and UPF ID fields to the billing call record, merges the BOSS (Business Operation Support System) statistical function into the OMC network management system, and improves its function, only calculates the flow, does not distinguish between package rates, and can obtain the statistical analysis effect of business distribution with the premise of minimizing investment.

[0013] During operation, the private network collects traffic data through this system and stores it in the network management database. According to the query results, the network parameters or contract data are adjusted and optimized to achieve the purpose of efficiently utilizing network resources to improve user experience and prioritize key services. The traffic statistics in the present invention are different from the operator network, which focuses on statistics by service type according to terminal users. Instead, it focuses on statistics of traffic within different service priority levels and number segments according to service resource allocation within the entire network.

[0014] The present invention integrates the authentication parameter database such as user account opening number segments, QoS parameters, 5G-LAN edge computing and the traffic statistics database into a production quality analysis database rather than an operating settlement database.

[0015] The present invention supports traffic query based on start and end numbers and wildcard codes. Since the private network terminal numbers are allocated in batches independently, rather than being allocated sporadically by ordinary consumers, querying traffic based on SUPI number segments has practical application value.

[0016] Compared with leasing operator sliced ​​virtual private networks, the solution of the present invention has the advantages of independent control, while also ensuring the security of production and operation data. Under the current development situation of virtual assets and data assets, the present invention has better investment returns and higher competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Billing system for operators' 5G core networks; Figure 2 5G private network system for vertical industries; Figure 3 Network diagram of the application architecture of the lightweight 5G private network billing method provided by the present invention; Figure 4 Run a flowchart for the system; Figure 5 Triggering flow charts for billing events; Figure 6 This is a schematic diagram of the ARP parameter mapping method; Figure 7 It is a schematic diagram of the UPF parameter mapping method; Figure 8 It is a schematic diagram of the billing triggering, updating and termination process in CHF; Fig. 9 It is a schematic diagram of the structure and interface of the charging network element CHF; Fig.10 This is a diagram showing the logical mapping relationship of the call record aggregation table. DETAILED DESCRIPTION

[0018] The technical solution provided by the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the following specific implementation methods are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0019] The present invention cuts out the online charging and converged charging functions in the 3GPP standard, retains only the offline charging part, adds CHF network elements in the self-built 5GC core network and makes improvements. Figure 3 shown.

[0020] The lightweight 5G private network billing method provided by the present invention has the following main processes: Figure 4 As shown, the following steps are included: Step 1: Perform network parameter configuration and user configuration. This step sets parameters according to network planning and activates subscription data for end users.

[0021] Step 2: Establish a session, trigger a billing event, and create a call record. The billing event triggering process in this step is as follows: Figure 5 As shown, the ARP parameter mapping method diagram is as follows Figure 6 shown.

[0022] This step specifically includes the following sub-steps: Step 2-1, the user network element sends a request to create a group unit session to the SMF (Session Management Function) module, and the SMF sends a session creation response message to the user network element to establish a session. The session creation response message includes the session type, continuity mode, QoS (Quality of Service) flow list, terminal IP address, etc. Figure 6 As shown in the figure, the QoS flow list contains ARP (Allocation and Retention Priority) data. SMF caches ARP from the HTTP message in response to the session request of AMF.

[0023] Step 2-2: The SMF (Session Management Function) module selects the appropriate UPF (User Platform Function) module according to the business-related type and interacts with the UPF for data. Figure 7 As shown in the figure, after the session is created, SMF sends a PFCP association creation request to UPF, and UPF sends a PFCP establishment response message to SMF, which includes the node number, cause value, user plane session number, etc. SMF caches the UPF NODE ID (node ​​number) from the PFCP message that selects the assigned UPF.

[0024] In step 2-3, the SMF module initiates a billing event notification to the billing network element CHF. CHF will record the conversation process and form a CDR (Call Detail Record) record, and then assemble it into a call record file according to a certain standard (ANS.1 in this case). CHF sends a new billing data response to SMF. When creating a new billing call record, CHF fills in the ARP and UPF fields in the CDR record. When creating and updating a call record, the VN-GROUP field may also be filled in the CDR record, but there are prerequisites, see below for details.

[0025] The detailed process of charging triggering, updating and termination in CHF is as follows Figure 8 As shown in the figure, when UPF reports the usage rate report to SMF, CHF is triggered by CTP. Figure 8 In step 12, the ARP and UPF fields are updated and inserted, and the cache in UPF and SMF is released at the same time. Specifically, CHF matches the ARP cached in step 2-1 according to the session number, and the cache time is controlled by the counter configured in the network management. The UPF node number NODE ID in the PFCP establishment response message is associated with the session number and combined with the configuration data in the network management to associate the UPF name.

[0026] like Fig. 9 As shown, the charging network element CHF consists of three subdivided functional modules: CTF Charge Trigger Function charging trigger function module, CGF Charge Gateway Function charging gateway function module, CDF Charging Data Function charging data function module. The call record recorded in CHF is called CDR, that is, Call Detail Record call detail record. The antenna signal coverage range of each communication base station is called a cell. The cell is identified by CI (Cell Identity). Multiple CIs are combined to form TAI (Trace Area Identity). When the data network searches for a terminal, it paging is performed in units of TAI. The present invention deploys the billing database and the network management database in one, uses different database tables under the same database instance, and constrains the legitimacy of the table in a process manner. All call records generated by users who are not contracted by this system are recorded as ownerless call records. The call record database and the network equipment configuration network management database are usually separated in different server hardware. The present invention combines the two databases in one database instance, and ensures data security by building in different accounts and permissions. At the same time, it can quickly query the equipment configuration parameters to build the configuration modification human-machine commands of intelligent operation and maintenance.

[0027] Furthermore, the present invention sets a timed data validity check process and adds the following constraints: The IP address or INSTANCE ID of UPF in the call record must exist in the network management configuration; the ARP index number in the call record must exist in the network management configuration and be activated ENABLE; the DNN in the call record must exist by name in the network management configuration and be associated with user data in the contract table; the VN-GROUP field can only be recorded in the call record after the 5G-LAN function of UPF in the network management is turned on, and the VN-GROUP to which the SUPI (terminal identification) number belongs in the network management is consistent with the call record.

[0028] Step 3: When the session is modified, update the call record. The following is a typical scenario for session modification: the user leaves the antenna communication area, and the wireless reallocation / access change occurs. It is necessary to update the billing data and the CDR record. It should be noted that session modification also includes other application scenarios. This step specifically includes the following sub-steps: Step 3-1, use the network element and SMF module to send the relevant request and response messages for session modification. The session response message includes the session type, continuity mode, QoS (Quality of Service) flow list, terminal IP address, etc. Each time a session is established, the SMF caches the ARP in the mandatory field QoS list in the response message.

[0029] Step 3-2: The SMF module selects the appropriate UPF according to the business-related type and interacts with the UPF for data. Figure 7 As shown, SMF sends a PFCP association creation request to UPF, and UPF sends a PFCP establishment response message to SMF, which includes a node number, a cause value, a user plane session number, etc. Each time a PFCP establishment response is made, the node number in the response message is cached.

[0030] Step 3-3, the SMF module initiates a billing event notification to the billing network element CHF, CHF updates the CDR record file, and CHF sends a billing data update response to the SMF.

[0031] During a session, ARP is usually not updated, but under certain specific conditions, such as when a user initiates a new service in a session, or when the business hall contracts data to modify the ARP, the ARP in the cache has been updated, and the latest ARP data is updated when the billing call record is updated. The update of UPF is similar. In the present invention, updating ARP and UPF does not rewrite the original ARP or NODE ID, but inserts a new record to record the original value and new value, the updated timestamp, and the traffic generated by the session. It is recorded in the session details when the CDR call record is cleaned into the database. A session can have multiple ARPs or even UPF NODE IDs, which are associated with different traffic statistics intervals.

[0032] When the network is congested, the system adjusts the communication priority of the terminals corresponding to each session based on the ARP data. Since 5G private network resources are relatively tight, timely adjustment of ARP data can prioritize the smooth progress of important communications.

[0033] Step 4: After the session ends, the session is released, the call record is saved, and the billing ends.

[0034] Step 5: After cleaning, the conversation form data is converted into a format suitable for database storage and stored in the database.

[0035] The contents of billing call record cleaning are shown in the following table: data Reference Standards illustrate Supi 3GPP TS 29.571

[371] Terminal identity (e.g. IMSI, NAI, GLI, GCI). Uint32 3GPP TS 29.571

[371] 32-bit unsigned integer Uint64 3GPP TS 29.571

[371] 64-bit unsigned integer PduSessionId 3GPP TS 29.571

[371] Session ID PduSessionType 3GPP TS 29.571

[371] Session Type Uri 3GPP TS 29.571

[371] Access resources AccessType 3GPP TS 29.571

[371] Access Type DateTime 3GPP TS 29.571

[371] Date and Time ChargingId 3GPP TS 29.571

[371] Billing ID RatingGroup 3GPP TS 29.571

[371] Rate type, optional Ipv4Addr 3GPP TS 29.571

[371] IPv4 address Ipv6Prefix 3GPP TS 29.571

[371] IPv6 prefix Ipv6Addr 3GPP TS 29.571

[371] IPv6 address. Pei 3GPP TS 29.571

[371] Terminal sets the serial number. TimeZone 3GPP TS 29.571

[371] Time Zone NfInstanceId 3GPP TS 29.571

[371] Network element identification Gpsi 3GPP TS 29.571

[371] telephone number DefaultQosInformation 3GPP TS 29.571

[371] Default QoS. SubscribedDefaultQos 3GPP TS 29.571

[371] Default QoS for contract AuthorizedDefaultQos 3GPP TS 29.512

[302] Permit Default QoS Ambr 3GPP TS 29.571

[371] Maximum aggregation rate QosData 3GPP TS 29.512

[302] Contains QoS parameters UserLocation 3GPP TS 29.571

[371] Terminal position PlmnId 3GPP TS 29.571

[371] Network Number Guami 3GPP TS 29.571

[371] AMF logo DurationSec 3GPP TS 29.571

[371] Duration. Snssai 3GPP TS 29.571

[371] Slice identification Problem Details 3GPP TS 29.571

[371] Error additional information ServiceId 3GPP TS 29.571

[371] Business Logo SscMode 3GPP TS 29.571

[371] SSC Mode type PresenceInfo 3GPP TS 29.571

[371] On-site reporting information Q 3GPP TS 29.571

[371] QoS flow identifier. AmfId 3GPP TS 29.571

[371] AMF Number D 3GPP TS 29.571

[371] Data access name GroupId 3GPP TS 29.571

[371] Group No. ExternalGroupId 3GPP TS 29.571

[371] External Group Number Bytes 3GPP TS 29.571

[371] byte Tai 3GPP TS 29.571

[371] Tracking Area Identifier Area 3GPP TS 29.571

[371] area CoreNetworkType 3GPP TS 29.571

[371] Core network type ServiceAreaRestriction 3GPP TS 29.571

[371] Service area restrictions GlobalRanNodeId 3GPP TS 29.571

[371] Base station identification QosCharacteristics 3GPP TS 29.512

[302] QoS Features SupportedFeatures 3GPP TS 29.571

[371] Support functions NsiLoadLevelInfo 3GPP TS 29.520

[306] Slice Weight ServiceExperienceInfo 3GPP TS 29.520

[306] Service Experience ApplicationChargingId 3GPP TS 29.571

[371] Application billing ID SharingLevel 3GPP TS 28.541

[254] Shared level MobilityLevel 3GPP TS 28.541

[254] Mobility S T 3GPP TS 28.541

[254] Slice Type Float 3GPP TS 29.571

[371] Floating point numbers OperationalState 3GPP TS 28.623

[257] Operational Status AdministrativeState 3GPP TS 28.623

[257] Managing Status ARP Non-standard custom fields Assigning and retaining priorities UPF Non-standard custom fields User plane functions The above table is a detailed table of CDR call record fields. In response to the needs of private network quality analysis and optimization, the present invention adds two non-3GPP standard fields ARP and UPF.

[0036] Step 6: Aggregate the call record data based on the database for query. The logical mapping relationship of the call record aggregation table is as follows: Fig.10 As shown in the figure, after the call list is cleaned and stored in the database, it is processed in the form of a scheduled task according to Fig.10 Usually, the operator's call bill does not distinguish the traffic before and after different ARP levels of a session, and only records the total traffic. In order to achieve the purpose of accurately optimizing resource allocation, the present invention will split the traffic of a session into different ARP or UPF aggregation tables when the call bill is aggregated by ARP.

[0037] Step 7: Intelligent Operation and Maintenance The present invention adds four functional units, namely, call list statistics query, threshold value setting, threshold alarm setting, and automatic adjustment mode setting, in the network management module.

[0038] In addition to the general query based on time and single user number, the call statistics query unit is designed to have fuzzy query functions based on ARP, DNN, UPF and user number segment. Fuzzy query supports single wildcard "?" and indefinite length wildcard "*" and start and end numbers. In the past, operators only provided call list queries based on user number, time period, and service type (such as DNN). The present invention adds query statistics entry based on communication equipment (such as UPF) and service characteristics (such as ARP).

[0039] The threshold setting unit is used to set the upper limit, lower limit, validity period, statistical object and type. The types are divided into upstream, downstream and bidirectional. When the traffic query in a certain dimension exceeds the threshold, the statistical data is displayed in red.

[0040] Threshold alarm setting unit, this unit can be turned on or off and set the alarm level. When the call bill aggregation result exceeds the threshold, it is sent to the alarm management agent via a RESTFUL message. The alarm can be confirmed, manually eliminated, and noted. When it returns to within the threshold value, the alarm is automatically eliminated.

[0041] The automatic adjustment mode setting unit is a task management method. A maximum of 100 tasks can be set. The following are examples: Set the statistical object to ARP, the adjustment object to UPF, and the trigger method to the upper limit of two-way traffic. When the two-way traffic reaches the upper limit, adjust the associated UPF of the slice corresponding to the user with the lowest ARP to the UPF with the smallest traffic. You can also adjust the UPF to belong to SST between different slices according to the traffic load, or reduce the maximum uplink or downlink AMBR bandwidth of all SUPIs with low ARP levels when the business is busy. Generate a human-machine interface command based on the adjustment object and adjustment method, and automatically send it to the network management for execution. If a task is triggered multiple times, you should consider manual expansion or reduction. All operations can be easily performed in the network management OMC.

[0042] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A lightweight 5G private network billing method. It is characterized in that The steps include: Step 1: Perform network parameter configuration and user configuration; Step 2: Establishing a session, triggering a billing event, and creating a call record; including the following sub-steps: Step 2-1, the network element sends a request to create a packet unit session to the SMF module, and the SMF sends a session creation response message to the network element to establish a session. The SMF caches the ARP in the QoS list in the response message; Step 2-2, the SMF module selects the appropriate UPF according to the service type and interacts with the UPF for data; the SMF sends a PFCP association creation request to the UPF, the UPF sends a PFCP establishment response message to the SMF, and the SMF caches the UPF node number in the response message; Step 2-3, the SMF module sends a billing event notification to the billing network element CHF, CHF records the session process, forms a CDR record, and then assembles it into a call record file according to the format standard, and CHF sends a billing data creation response to SMF; when creating a new billing call record, CHF fills in the ARP and UPF fields in the CDR record; Step 3, when the session is modified, update the call record; including the following sub-steps: Step 3-1, use the network element and SMF module to send the relevant request and response messages for session modification, and cache the ARP in the QoS list in the response message each time the session is established; Step 3-2, the SMF module selects a suitable UPF according to the business-related type, and interacts with the UPF for data. The SMF sends a PFCP association creation request to the UPF, and the UPF sends a PFCP establishment response message to the SMF. When the PFCP establishes a response, the UPF node number in the response message is cached; Step 3-3, the SMF module initiates a billing event notification to the billing network element CHF, CHF updates the CDR record file, and CHF sends a billing data update response to the SMF; Step 4: After the session ends, the session is released, the call record is saved, and the billing ends; Step 5: After cleaning, the conversation data is converted into a format suitable for database storage and stored in the database; Step 6: Aggregate call record data based on the database for query; Step 7, intelligent operation and maintenance, including: Call statistics query, used to query by time and single user number, as well as fuzzy query by ARP, DNN, UPF and user number segment, and supports query conditions containing single wildcard "?", indefinite length wildcard "*", start and end numbers; Threshold setting is used to set the upper limit, lower limit, validity period, statistical object and type. When the traffic query of a certain dimension exceeds the threshold, the statistical data will be displayed in red; Threshold alarm setting is used to open, close, and set the alarm level. When the call bill aggregation result exceeds the threshold, it is sent to the alarm management agent via a RESTFUL message. The alarm can be confirmed, manually eliminated, and commented. When it returns to within the threshold value, the alarm is automatically eliminated. The automatic adjustment mode setting is used to set automatic adjustment tasks according to pre-set rules. When the triggering conditions of the rules are met, the adjustment objects and adjustment parameters in the rules are obtained to generate human-machine interface commands, which are automatically issued and executed in network management.

2. According to claim 1, the lightweight 5G private network billing method, It is characterized in that The session creation response message includes: session type, continuity mode, QoS flow list, and terminal IP address.

3. According to claim 1, the lightweight 5G private network billing method, It is characterized in that The PFCP establishment response message includes: UPF node number, reason value, and user plane session number.

4. The lightweight 5G private network billing method according to claim 1, It is characterized in that When UPF reports the utilization report to SMF, CHF is triggered by CTP to update and insert the ARP and UPF fields, and the cache storing ARP and UPF is released at the same time; the ARP and UPF fields are obtained through the following process: CHF matches the cached ARP according to the session number, and associates the cached UPF node number with the configuration data in the network management according to the session number to obtain the UPF name.

5. The lightweight 5G private network billing method according to claim 1, It is characterized in that When the preset conditions are met, ARP and / UPF are updated when CHF updates the CDR record file in step 3-3.

6. The lightweight 5G private network billing method according to claim 1, It is characterized in that When the 5G-LAN function of UPF in the network management is turned on, the VN-GROUP field is recorded in the call record, and the VN-GROUP to which the SUPI number belongs in the network management is consistent with the call record.

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