A method to improve the IMSI backfill rate and accuracy of XDR collected by network monitoring

Abstract

The present invention relates to a method for improving the IMSI backfill rate and accuracy of network monitoring and collection of XDR. For the monitoring and collection of 4G, 5G and 4 / 5G networks, the method comprises: when the collection side processes a process at the S1-MME or / and N1N2 interface, giving priority to sending XDR records involving cross-interface multi-interface association consistency rules; when the multi-interface association consistency rules take priority, refreshing the GUTI backfill rules; when the multi-interface association consistency rules and the GUTI backfill rules take effect at the same time, adding a user relationship multi-interface consistency verification process, and if there is inconsistency, giving priority to using the multi-interface association consistency rules to refresh the GUTI backfill rules; when a process is complete but there is an abnormality in a sub-process, the GUTI backfill rules are not updated. The present invention adopts a multi-interface association consistency backfill processing strategy, which has a good promoting effect on improving the backfill rate and backfill accuracy of XDR user identity information IMSI of the S1-MME interface or / and N1N2 port.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring. Background Art

[0002] Due to 4G / 5G network transmission, IMSI / SUPI information is not allowed on the Um and Uu interfaces. Only M-TMSI and GUTI information is allowed. Therefore, XDR records collected on the S1-MME and N1N2 interfaces must be backfilled with IMSI / SUPI to meet application analysis requirements. Otherwise, the XDR records are useless and discarded! The IMSI backfill rate and accuracy of the synthesized XDR data collected by the signaling monitoring system probe are important indicators of the probe's monitoring and collection integrity. Summary of the Invention

[0003] In view of this, the present invention provides a method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring. The method can be applied to 4G, 5G, and 4 / 5G service interaction scenarios, and analyzes the XDR backfill rate and backfill accuracy of the S1-MME and / or N1N2 interfaces, confirms the backfill rate and backfill accuracy that currently affect the XDR backfill of user identity information IMSI and location information, and solves the basic data processing problems that exist in avoiding single-interface backfill service applications.

[0004] Other features and advantages of the present invention will become apparent from the following detailed description, or may be learned in part by practice of the present invention.

[0005] One aspect of the present invention discloses a method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring, which includes the following steps for monitoring and collecting 4G networks:

[0006] Step S101: When the collection side processes an S1 process at the S1-MME interface, it preferentially sends XDR records involving cross-interface multi-interface association consistency rules;

[0007] Step S102: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule;

[0008] Step S103: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule.

[0009] Step S104: When the S1 process is complete but there is an abnormality in a sub-process, the GUTI backfill rule is not updated.

[0010] Another aspect of the present invention further discloses a method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring, which includes the following steps for monitoring and collecting 5G networks:

[0011] Step S201: When the collection side processes an N1N2 process at the N1N2 interface, the XDR record involving the cross-interface multi-interface association consistency rule is preferentially sent;

[0012] Step S202: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule;

[0013] Step S203: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule.

[0014] Step S204: When an N1N2 process is complete but a sub-process exception occurs, the GUTI backfill rule is not updated.

[0015] Another aspect of the present invention discloses a method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring, which includes the following steps for monitoring and collecting data on a 4 / 5G hybrid network deployed with an N26 interface:

[0016] When working on a 4G network, refresh and verify the multi-interface association consistency rules and GUTI backfill rules of the S1-MME interface, and analyze the XDR backfill rate and backfill accuracy;

[0017] When working on a 5G network, refresh and verify the multi-interface association consistency rules and GUTI backfill rules for the N1N2 interface, and analyze the XDR backfill rate and backfill accuracy;

[0018] When working in the 4G and 5G network transition, the multi-interface association consistency rules and GUTI backfill rules of the S1-MME interface, N1N2 interface and N26 interface are refreshed and verified, and the XDR backfill rate and backfill accuracy are analyzed.

[0019] The present invention achieves at least the following beneficial effects:

[0020] This invention, under standardized probe access conditions, employs a multi-interface consistent backfill processing strategy, significantly improving the backfill rate and accuracy of XDR user identity information (IMSI) on the Dutrace S1-MME interface and / or N1N2 interfaces. For complex service scenarios and abnormal terminal processes in existing networks, a multi-interface consistent backfill strategy is employed to further enhance the XDR IMSI backfill rate and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features, and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the accompanying drawings. The drawings described below are merely some embodiments of the present invention. It is clear to a person skilled in the art that other drawings can be derived from these drawings without inventive effort.

[0022] Figure 1 This is a flow chart of a method for improving the IMSI backfill rate and accuracy of XDR collected by 4G network monitoring in Example 1 of the present invention;

[0023] Figure 2 This is a diagram showing the processing relationship of backfilling cross-interface numbers in a 4G system according to the first embodiment of the present invention;

[0024] Figure 3 This is a flow chart of a method for improving the IMSI backfill rate and accuracy of XDR collected by 5G network monitoring in Example 2 of the present invention;

[0025] Figure 4 This is a diagram showing the processing relationship for backfilling interface numbers in a 5G system according to the second embodiment of the present invention.

[0026] Figure 5 This is a flow chart of a method for monitoring and collecting the IMSI backfill rate and accuracy of XDR in a 4 / 5G hybrid network deployed with an N26 interface in Example 3 of the present invention;

[0027] Figure 6 This is a processing relationship diagram for backfilling interface numbers in the 4 / 5G system in Example 3 of the present invention. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the drawings represent like or similar parts, and thus repeated description thereof will be omitted.

[0029] Example 1

[0030] An embodiment of the present invention illustrates a method for improving the IMSI backfill rate and accuracy of XDRs collected by 4G network monitoring. Based on the XDRs collected and synthesized by the 4G network, the method backfills the IMSI based on conventional interface processing containing GUTI information. The multi-interface association consistency rules and GUTI backfill rules in the S1 process of the S1-MME interface are refreshed and verified. The XDR backfill rate and backfill accuracy are analyzed, and the factors currently affecting the backfill rate and backfill accuracy of the XDR backfill of user identity information IMSI and location information on the Dutrace S1-MME interface are identified.

[0031] During a service process, the associated interfaces (such as S6a, S11, Sgs, etc.) carry IMSI information because the service itself carries it; this IMSI is more accurate than the IMSI learned indirectly by the S1 interface through the GUTI-IMSI rule.

[0032] Therefore, based on the key information in the business, the S1 interface is associated with interfaces such as S11, S6a, and Sgs, and the IMSI obtained from these interfaces is used to calibrate and improve the IMSI accuracy of the S1 interface.

[0033] The factors that currently affect the backfill rate and accuracy of the Dutrace S1-MME interface XDR backfill of user identity information (IMSI) and location information include:

[0034] 1) The associated interface access is incomplete or the process timeout rate is high;

[0035] Because the S1-MME interface itself cannot learn a user's complete IMSI information, it relies on XDR associations with MME-related interfaces during service transactions. For example, IMSI learning relies on associations with S6a during the authentication process, SGs during the joint attach / location update process, and S11 during the bearer creation / handover process. MSISDN learning, on the other hand, relies entirely on S6a and S11.

[0036] Based on the above reasons, the XDR access integrity and data access quality around the MME's S11, S6a, and SGs interfaces have a huge impact on the user identity information backfill rate and accuracy of the S1-MME interface.

[0037] 2) Temporary interruption of learning about GUTI changes;

[0038] The relationship between the S1-MME interface and user identity information maintenance depends on the tracking and processing of the GUTI reallocation process. When the GUTI reallocation process learning is abnormal, the backfilling of user identity information and location information will be seriously affected.

[0039] 3) XDR synthesis abnormality on the S1-MME interface;

[0040] Due to packet loss in the S1-MME interface synthesis, two or more S1 processes are combined into one XDR record, causing the backfill learning to record the incorrect relationship between the GUTI and user identity information, which affects the accuracy of IMSI backfill.

[0041] 4) Incomplete processing of business scenario data;

[0042] Due to the limited processing capacity of a single probe backfill program, it is impossible to process all MME traffic through a single server backfill program. Distributed networking is the only option. The current networking method does not fully consider the following scenarios, affecting the backfill rate and accuracy of user identity information on the S1-MME interface:

[0043] a) The existing networking method prevents the backfilling of some entry-side records for cross-MME handovers. The subsequent MTMSI-IMSI relationship needs to be relearned. The cross-MME handover process is the main reason for the low backfill rate of the S1 handover process.

[0044] b) The cross-MME TAU process is diverted to different probe server backfill programs, which inevitably leads to the backfill program on the other side failing to learn the GUTI change process. When the backfill program on the other side learns the new GUTI change relationship abnormally, it will cause user identity information backfill errors, thereby affecting the backfill accuracy. The cross-MME TAU process is the main reason for the current user identity backfill errors.

[0045] 5) XDR processing delay and transmission disorder;

[0046] The complete S1 process is split into multiple sub-CDR records according to specifications. Different sub-CDRs have different processing delays during the probe and IMSI backfill process. The out-of-order transmission caused by traffic splitting on the soft bus affects the IMSI backfill rate of the S1-MME.

[0047] 6) Different equipment vendors have different business process processing mechanisms;

[0048] Different switch manufacturers use different user authentication strategies, authentication frequencies, and mandatory authentication policies. This leads to different difficulty levels and backfill rates for S1-MME port number learning.

[0049] 7) Terminal service abnormality;

[0050] There are service anomalies in the existing network terminals. Such anomalies may not be perceived by the core network, thus affecting the relationship learning of the association backfill of normal user identity information; or they may be perceived and circumvented by the core network but cannot be perceived by the signaling monitoring system association backfill program. Such scenarios will inevitably affect the accuracy of the backfill of user identity information and location information in the association backfill program.

[0051] 8) Program processing exceptions;

[0052] Due to the existence of scenarios such as packet loss, XDR synthesis anomalies, and terminal GUTI reporting anomalies, the accuracy of user identity information learned through GUTI change relationships is no longer reliable.

[0053] Under the existing processing mechanism, when multiple interface association consistency rules and GUTI backfill rules are processed simultaneously during an S1 process, there is a phenomenon of changes in user identity information relationships caused by unreliable GUTI change relationships (that is, abnormal changes in the correspondence between IMSI and MSISDN numbers), which causes drastic jumps in user location information.

[0054] Unreliable GUTI change relationships can cause user identity information backfill anomalies, which are difficult to avoid. However, the consistency of user identity information backfill is crucial for association backfill processing. To address this, we optimize the backfill processing mechanism. When multiple interface association rules and backfill rules coexist, we specify a priority processing strategy and a user identity information consistency verification strategy. This avoids various issues associated with a single S1-MME interface learning backfill mechanism, improves the accuracy and consistency of user identity information backfill, and ultimately increases the IMSI backfill rate.

[0055] Based on the above issues affecting the IMSI backfill rate and accuracy of XDR collected by the signaling monitoring system probe.

[0056] The method of this embodiment for improving the IMSI backfill rate and accuracy of XDR collected by 4G network monitoring is as follows: Figure 1 As shown, the following steps are included:

[0057] Step S101: When the collection side processes an S1 process at the S1-MME interface, it preferentially sends XDR records involving cross-interface multi-interface association consistency rules;

[0058] During an S1 process, including the Attach and TAU processes, the IMSI is carried in the XDR records of interfaces associated with S1-MME services, including S6a, Sgs, and S11. The IMSI accuracy of the S6a, Sgs, and S11 interfaces is higher than the IMSI accuracy backfilled by the S1-MME itself using the GUTI.

[0059] The multi-interface association consistency rule is:

[0060] When S1 successfully associates services with the associated interface, if the IMSI of S1 is inconsistent with the IMSI in the XDR of the associated interface, the IMSI of S1 is refreshed using the IMSI obtained from the XDR of the associated interface. When S1 completes service association with multiple interfaces at the same time and the IMSIs are all consistent, the IMSI is considered to be correct.

[0061] Step S102: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule;

[0062] The GUTI backfill rules include:

[0063] 1) During the IMSI attach process on the S1-MME interface, learn the GUTI-IMSI correspondence in the XDR;

[0064] 2) When only the GUTI is carried in the subsequent S1 process, the corresponding IMSI is backfilled based on the previously learned GUTI-IMSI relationship;

[0065] 3) During the reallocation process including TAU, Attach, and GUTI, the GUTI will be updated, and the correspondence between the old GUTI and the new GUTI will be learned to update the GUTI-IMSI correspondence.

[0066] Step S103: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule.

[0067] In the consistency check process,

[0068] After the service association is successful, compare the IMSI obtained from the association interface with the IMSI obtained by backfilling the GUTI-IMSI relationship on the S1-MME interface to see if they are consistent;

[0069] If they are consistent, the GUTI-IMSI relationship of the S1-MME interface is determined to be correct;

[0070] If they are inconsistent, the GUTI-IMSI relationship on the S1-MME interface is considered inaccurate. Perform the following operations:

[0071] 1) Update the IMSI in the S1-MME interface XDR;

[0072] 2. Update the GUTI-IMSI relationship.

[0073] Step S104: When the S1 process is complete but there is an abnormality in a sub-process, the GUTI backfill rule is not updated.

[0074] The sub-process exception includes an abnormal process in which the Attach process is complete but the authentication process fails.

[0075] Through the above process, in an environment with standardized probe access, the use of a multi-interface association consistent backfill processing strategy has a good promoting effect on improving the backfill rate and backfill accuracy of the XDR user identity information IMSI of the Dutrace S1-MME interface!

[0076] For complex business scenarios in the existing network and abnormal business processes of terminals, a multi-interface association consistent backfill strategy is adopted to ensure further improvement of XDR's IMSI backfill rate and backfill accuracy.

[0077] More specifically, in a 4G network, during the UE terminal attach process, the interface service association process involved includes:

[0078] 1) The S1 initial context establishment process is associated with the S11 session creation process through consistent bearer information; the S11 session creation message carries the IMSI;

[0079] 2) The S1 and S6a authentication processes are linked by consistent authentication parameter information; S6a authentication messages all carry the IMSI;

[0080] The complete authentication process involves two interfaces, S1 and S6a, and the XDRs of the two interfaces carry the same authentication information. Therefore, we can associate the XDRs of the two interfaces through the authentication information.

[0081] In the 3GPP standard flow, during an Attach service process, service associations of multiple interfaces will occur, and the XDR record of each interface will carry the IMSI.

[0082] In a 4G network, the interface service association process involved in the terminal's joint attach / joint location update process includes:

[0083] The S1 Attach / TAU process and the SGs Location Update process are linked through TMSI allocation. The SGs Location Update message carries the user's IMSI. For details, see the Attach / TAU and Location Update procedures in the 4G specification.

[0084] More specifically, in this embodiment, the 4G network cross-interface IMSI number backfill and association process includes:

[0085] The S1-MME interface obtains the IMSI by associating with the Sgs interface, S6a interface, and S11 interface through the TAU, Attach, authentication, and PDN connection establishment processes;

[0086] The S1-MME interface maintains the correspondence between the 4G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI;

[0087] The Sgs and S6a interfaces obtain the MSISDN from the UE-Node via the IMSI carried in the XDR. When the S6a interface XDR also carries the number, the relationship between the IMSI and MSISDN is updated to the UE-Node.

[0088] The S11 interface maintains the IMSI relationship through Sgw-C information and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node.

[0089] The S5 / S8 interface uses PGW-C information to maintain the IMSI relationship and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node.

[0090] The S1-U / S11-U interface maintains the IMSI relationship by associating the Sgw-U information with the S11 interface, and then obtains the MSISDN from the UE-Node based on the IMSI.

[0091] The S5S8-U interface maintains the IMSI relationship by associating the Pgw-U information with the S5 / S8 interface, and then obtains the MSISDN from the UE-Node based on the IMSI.

[0092] Each 4G-soft acquisition interface maintains the IMSI relationship by associating the S1-AP information with the S1-MME interface that has backfilled the IMSI, and then obtains the MSISDN from the UE-Node based on the IMSI.

[0093] Figure 2 This diagram illustrates the cross-interface number backfill process within the 4G system. The solid line represents conventional single-interface backfill processing, where a complete and accurate IMSI-MSISDN relationship is obtained. The long dashed line represents service association between two interfaces using corresponding association information. The dotted line represents backfill within an interface, which in the case of the S1 interface is GUTI-IMSI backfill.

[0094] Figure 2 In the example, UE-Node represents a backfill learning table established based on user IMSI-MSISDN-IMEI-GUTI and other information.

[0095] In summary, the embodiments of the present invention, under standardized probe access conditions, employ a multi-interface consistent backfill processing strategy, significantly improving the backfill rate and accuracy of XDR user identity information (IMSI) on the Dutrace S1-MME interface. For complex service scenarios and abnormal terminal processes in existing networks, a multi-interface consistent backfill strategy is employed to further improve the IMSI backfill rate and accuracy of XDR in 4G networks.

[0096] Example 2

[0097] An embodiment of the present invention shows a method for improving the IMSI backfill rate and accuracy of XDR collected by 5G network monitoring. Based on the XDR collected and synthesized by the 5G network, the IMSI is backfilled based on conventional interface processing containing GUTI information, the XDR backfill rate and backfill accuracy of the N1N2 interface are analyzed, and the factors currently affecting the backfill rate and backfill accuracy of the XDR backfill of user identity information IMSI and location information on the N1N2 interface are confirmed.

[0098] Based on the above-mentioned problem affecting the IMSI backfill rate and accuracy of XDR collected by the signaling monitoring system probe; the method of improving the IMSI backfill rate and accuracy of 5G network monitoring and XDR collection in this embodiment, such as Figure 3 As shown, the following steps are included:

[0099] The monitoring and collection of 5G networks includes the following steps:

[0100] Step S301: When the collection side processes an N1N2 process at the N1N2 interface, the XDR record involving the cross-interface multi-interface association consistency rule is preferentially sent;

[0101] During an N1N2 process, including authentication and PDU session establishment, the IMSI is carried in the XDR records of interfaces associated with the N1N2 service, including the N12, N11, and N4 interfaces. The IMSI accuracy of the N12, N11, and N4 interfaces is higher than the IMSI accuracy of the N1N2 interface itself backfilled using the GUTI.

[0102] The multi-interface association consistency rule is:

[0103] When the N1N2 interface is successfully associated with the associated interface service, if the IMSI of the N1N2 interface is inconsistent with the IMSI in the XDR of the associated interface, the IMSI of the N1N2 interface is refreshed using the IMSI obtained from the XDR of the associated interface;

[0104] When the N1N2 interface completes service association with multiple interfaces at the same time and the IMSIs are all consistent, the IMSI is considered to be accurate.

[0105] Step S302: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule;

[0106] The GUTI backfill rules include:

[0107] 1) During the IMSI attach process on the N1N2 interface, learn the GUTI-IMSI correspondence in XDR;

[0108] 2) When only the GUTI is carried in the subsequent N1N2 process, the corresponding IMSI is backfilled based on the previously learned GUTI-IMSI relationship;

[0109] 3) During the reallocation process including TAU, Attach, and GUTI, the GUTI will be updated, and the correspondence between the old GUTI and the new GUTI will be learned to update the GUTI-IMSI correspondence.

[0110] Step S303: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule.

[0111] In the consistency check process,

[0112] After the service association is successful, compare the IMSI obtained from the association interface with the IMSI obtained by backfilling the GUTI-IMSI relationship on the N1N2 interface to see if they are consistent;

[0113] If they are consistent, the GUTI-IMSI relationship of the N1N2 interface is determined to be correct;

[0114] If they are inconsistent, the GUTI-IMSI relationship of the N1N2 interface is determined to be inaccurate. Perform the following operations:

[0115] 1) Update the IMSI in the XDR of the SN1N2 interface;

[0116] 2. Update the GUTI-IMSI relationship.

[0117] Step S304: When an N1N2 process is complete but a sub-process exception occurs, the GUTI backfill rule is not updated.

[0118] The sub-process exception includes an abnormal process in which the Attach process is complete but the authentication process fails.

[0119] Through the above process, in an environment with standardized probe access, the use of a multi-interface association consistent backfill processing strategy has a good promoting effect on improving the backfill rate and backfill accuracy of the XDR user identity information IMSI of the N1N2 interface!

[0120] For complex business scenarios in the existing network and abnormal business processes of terminals, a multi-interface association consistent backfill strategy is adopted to ensure further improvement of XDR's IMSI backfill rate and backfill accuracy.

[0121] More specifically, in the 5G network, the process of multi-interface association consistency is to establish multi-interface association consistency backfill rules through the multi-interface association consistency process information existing in the network, so as to avoid the various problems of tracking and learning GUTI / TMSI backfilling IMSI in the N1N2 single interface backfill processing, thereby improving the backfill accuracy of the IMSI processed by the entire probe and improving the backfill rate of the user identity information IMSI of the NIN2 interface.

[0122] More specifically, in this embodiment, the 5G network cross-interface IMSI number backfill and association processing process includes:

[0123] The N1N2 interface can be associated with the N12 interface, N11 interface, and N4 interface to obtain the IMSI through authentication and PDU session establishment process;

[0124] The N1N2 interface maintains the correspondence between the 5G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI;

[0125] The N4 interface maintains the IMSI relationship through Smf-C information. It can also obtain the IMSI by associating with the N11 interface during the PDU session establishment process, and then obtain the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship will be updated to the UE-Node.

[0126] The Http2 protocol interface maintains the IMSI relationship through information such as callbak_uri / subscriptionId / smf-C, and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR carries both the IMSI and MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node.

[0127] The N3 interface associates the UPF-U information with the N11 / N4 interface to maintain the IMSI relationship, and then obtains the MSISDN from the UE-Node based on the IMSI;

[0128] The N4 interface maintains the IMSI relationship by associating the upf-U information / ue_ip information with the N4 interface, and then obtains the MSISDN from the UE-Node based on the IMSI;

[0129] Each 5G soft acquisition interface maintains the IMSI relationship by associating the S1-AP information with the S1-MME interface that has backfilled the IMSI, and then obtains the MSISDN from the UE-Node based on the IMSI.

[0130] Figure 4 This diagram illustrates the backfill processing for each interface within the 5G system. The solid line represents conventional single-interface backfill processing, where a complete and accurate IMSI-MSISDN relationship is obtained. The long dashed line represents service association between two interfaces using corresponding association information. The dotted line represents backfill within an interface, which in the case of the N1N2 interface is GUTI-IMSI backfill.

[0131] Figure 4 In the example, UE-Node represents a backfill learning table established based on user IMSI-MSISDN-IMEI-GUTI and other information.

[0132] Example 3

[0133] An embodiment of the present invention shows a method for improving the IMSI backfill rate and accuracy of XDR collected by 4G / 5G network monitoring. On the basis of the XDR collected and synthesized by the 4G / 5G network, the IMSI is backfilled based on the conventional interface processing containing GUTI information, the multi-interface association consistency rules and GUTI backfill rules in the S1 process and N1N2 process of the S1-MME interface and the N1N2 port are refreshed and verified, the XDR backfill rate and backfill accuracy are analyzed, and the factors currently affecting the backfill rate and backfill accuracy of the XDR backfill of user identity information IMSI and location information on the S1-MME interface and the N1N2 interface are confirmed.

[0134] More specifically, it is a method for monitoring and collecting the IMSI backfill rate and accuracy of XDR in a 4 / 5G hybrid network that deploys the N26 interface. In a 4G / 5G service interaction scenario, when the N26 interface is deployed in the network, the existence of the N26 interface will support the transmission of mobility management state and session management state between the source network and the target network during the interoperation process. Therefore, when the operator deploys the N26 interface, the UE only needs to operate in single registration mode, and the network only needs to maintain one available mobility management state of the UE at the same time to ensure seamless service and session continuity for users. When the UE moves from the 5GC to the EPC, the SMF determines the part of the PDU session that can be relocated to the target EPS based on the EPS capabilities and the operator's specific mobility management policy, and releases the other part of the PDU session that cannot be migrated to the EPS.

[0135] When the UE is in idle state, if movement from 5GC to EPC occurs, the UE can choose to use the EPS-GUTI mapped from the 5G-GUTI to perform the tracking area update process or the 4G attachment process to complete the mobility processing. The MME obtains the UE's mobility management context and session management context in 5G through the N26 interface. During this process, the MME is not aware of the cross-system interoperability process. During the entire processing process, the N26 interface is equivalent to the S10 interface from the perspective of MME processing. If the UE moves from EPC to 5GC in the idle state, the UE will use the 5G-GUTI mapped from the EPS-GUTI to perform the mobility registration (MobilityRegistration) process and indicate to the network that the source network of the UE is EPC. At the same time, the AMF obtains the UE's mobility management context and session management context in 4G through the N26 interface, and sends the session part information to the SMF.

[0136] When the UE is in the connected state, whether it moves from 5GC to EPC or from EPC to 5GC, the cross-system handover process will be executed. During the handover process, HSS+UDM will no longer accept registration requests sent by AMF or MME for the UE.

[0137] Specifically, the method of improving the IMSI backfill rate and accuracy of network monitoring and collection XDR in this embodiment is for monitoring and collection of 4 / 5G hybrid networks deployed with N26 interfaces, such as Figure 5 As shown, the following steps are included:

[0138] When working on a 4G network, refresh and verify the multi-interface association consistency rules and GUTI backfill rules of the S1-MME interface, and analyze the XDR backfill rate and backfill accuracy;

[0139] When working on a 5G network, refresh and verify the multi-interface association consistency rules and GUTI backfill rules for the N1N2 interface, and analyze the XDR backfill rate and backfill accuracy;

[0140] When working in the 4G and 5G network transition, the multi-interface association consistency rules and GUTI backfill rules of the S1-MME interface, N1N2 interface and N26 interface are refreshed and verified, and the XDR backfill rate and backfill accuracy are analyzed.

[0141] Specifically, when working on a 4G network, refer to the multi-interface association consistency rule and GUTI backfill rule in Example 1;

[0142] During the cross-interface IMSI backfill process when working on a 4G network:

[0143] The S1-MME interface associates with the SGS interface, S6a interface, and S11 interface to obtain the IMSI through the TAU, Attach, authentication, and PDN connection establishment processes;

[0144] The S1-MME interface maintains the correspondence between the 4G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI;

[0145] The S6a interface obtains the MSISDN from the UE-Node through the IMSI carried in the XDR. When the S6a interface XDR also carries the number, the relationship between the IMSI and MSISDN is updated to the UE-Node.

[0146] The S11 interface maintains the IMSI relationship through Sgw-C information, and then obtains the MSISDN from the UE-Node based on the IMSI; when the XDR also carries the MSISDN, the IMSI and MSISDN relationship will be updated to the UE-Node.

[0147] During the cross-interface IMSI backfill process when working on a 5G network:

[0148] The N1N2 interface can be associated with the N12 interface and the N11 interface to obtain the IMSI through the authentication and PDU session establishment process;

[0149] The N1N2 interface maintains the correspondence between the 5G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI;

[0150] The N11 interface maintains the IMSI relationship through Smf-C information, associates and obtains the IMSI, and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node;

[0151] The S12 interface obtains the MSISDN from the UE-Node through the IMSI carried in the XDR. When the N12 interface XDR also carries the number, the relationship between the IMSI and MSISDN is updated to the UE-Node.

[0152] Backfill process of cross-interface IMSI when working on 4 / 5G network: In addition to the backfill process of cross-interface IMSI when working on 4G network and the backfill process of cross-interface IMSI when working on 5G network, it also includes:

[0153] The N26 interface updates the GUTI-IMSI relationship of the S1-MME interface through the GUTI information carried in the XDR.

[0154] The N26 interface obtains the MSISDN from the UE-Node through the IMSI carried in the XDR information, and the N11 interface obtains the IMSI by associating with the N26 interface through the PDU session establishment process.

[0155] Figure 6 This section describes the cross-interface IMSI number backfilling mechanism in 4G / 5G interworking scenarios based on the N26 interface. The solid line represents conventional single-interface backfilling, which obtains a complete and accurate IMSI-MSISDN relationship from this interface. The long dashed line represents service correlation between two interfaces using corresponding correlation information. The dotted line represents backfilling within an interface, which in the case of the N1N2 interface is GUTI-IMSI backfilling.

[0156] Figure 6 In the example, UE-Node represents a backfill learning table established based on user IMSI-MSISDN-IMEI-GUTI and other information.

[0157] The exemplary embodiments of the present invention are specifically shown and described above. It should be understood that the present invention is not limited to the detailed structure, configuration or implementation described herein; on the contrary, the present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring, characterized in that: The monitoring and collection of 4G networks includes the following steps: Step S101: When the collection side processes an S1 process at the S1-MME interface, it preferentially sends XDR records involving cross-interface multi-interface association consistency rules; Step S102: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule; Step S103: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule. Step S104: When the S1 process is complete but there is an abnormality in the sub-process, the GUTI backfill rule is not updated; The multi-interface association consistency rule is: When the S1-MME interface is successfully associated with the associated interface service, if the IMSI of the S1-MME interface is inconsistent with the IMSI in the XDR of the associated interface, the IMSI of S1 is refreshed using the IMSI obtained from the XDR of the associated interface; When the S1-MME interface completes service association with multiple interfaces at the same time and the IMSIs are consistent, the IMSI is considered accurate; The GUTI backfill rules include: 1) During the IMSI attach process on the S1-MME interface, learn the GUTI-IMSI correspondence in the XDR; 2) When only the GUTI is carried in the subsequent S1 process, the corresponding IMSI is backfilled based on the previously learned GUTI-IMSI relationship; 3) During the reallocation process including TAU, Attach, and GUTI, the GUTI will be updated, and the correspondence between the old GUTI and the new GUTI will be learned to update the GUTI-IMSI correspondence.

2. The method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring according to claim 1 is characterized in that: The backfill process of cross-interface IMSI on the 4G network includes: The S1-MME interface associates with the Sgs interface, S6a interface, and S11 interface to obtain the IMSI through the TAU, Attach, authentication, and PDN connection establishment processes; The S1-MME interface maintains the correspondence between the 4G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI; The Sgs and S6a interfaces obtain the MSISDN from the UE-Node via the IMSI carried in the XDR. When the S6a interface XDR also carries the number, the relationship between the IMSI and MSISDN is updated to the UE-Node. The S11 interface maintains the IMSI relationship through Sgw-C information, and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node. The S5 / S8 interface maintains the IMSI relationship through PGW-C information, and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node. The S1-U / S11-U interface maintains the IMSI relationship by associating the Sgw-U information with the S11 interface, and then obtains the MSISDN from the UE-Node based on the IMSI; The S5S8-U interface maintains the IMSI relationship by associating the Pgw-U information with the S5 / S8 interface, and then obtains the MSISDN from the UE-Node based on the IMSI; Each 4G-soft acquisition interface maintains the IMSI relationship by associating the S1-AP information with the S1-MME interface that has backfilled the IMSI, and then obtains the MSISDN from the UE-Node based on the IMSI.

3. A method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring, characterized in that: The monitoring and collection of 5G networks includes the following steps: Step S201: When the collection side processes an N1N2 process at the N1N2 interface, the XDR record involving the cross-interface multi-interface association consistency rule is preferentially sent; Step S202: When the multi-interface association consistency rule takes precedence, refresh the GUTI backfill rule; Step S203: When the multi-interface association consistency rule and the GUTI backfill rule are in effect at the same time, a user relationship multi-interface consistency check process is added. If there is any inconsistency, the multi-interface association consistency rule is used first to refresh the GUTI backfill rule. Step S204: When an N1N2 process is complete but a sub-process exception occurs, the GUTI backfill rule is not updated; The multi-interface association consistency rule is: When the N1N2 interface is successfully associated with the associated interface service, if the IMSI of the N1N2 interface is inconsistent with the IMSI in the XDR of the associated interface, the IMSI of the N1N2 interface is refreshed using the IMSI obtained from the XDR of the associated interface; When the N1N2 interface completes service association with multiple interfaces at the same time and the IMSIs are all consistent, the IMSI is considered accurate; The GUTI backfill rules include: 1) During the IMSI attach process on the N1N2 interface, learn the GUTI-IMSI correspondence in XDR; 2) When only the GUTI is carried in the subsequent N1N2 process, the corresponding IMSI is backfilled based on the previously learned GUTI-IMSI relationship; 3) During the reallocation process including TAU, Attach, and GUTI, the GUTI will be updated, and the correspondence between the old GUTI and the new GUTI will be learned to update the GUTI-IMSI correspondence.

4. The method for improving the IMSI backfill rate and accuracy of XDR collected by network monitoring according to claim 3, characterized in that: The backfill process of cross-interface IMSI in 5G network includes: The N1N2 interface can be associated with the N12 interface, N11 interface, and N4 interface to obtain the IMSI through authentication and PDU session establishment process; The N1N2 interface maintains the correspondence between the 5G-GUTI and the IMSI, and then obtains the MSISDN from the UE-Node through the IMSI; The N4 interface maintains the IMSI relationship through Smf-C information. It can also obtain the IMSI by associating with the N11 interface during the PDU session establishment process. Then, the MSISDN is obtained from the UE-Node based on the IMSI. When the XDR also carries the MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node. The Http2 protocol interface maintains the IMSI relationship through information such as callbak_uri / subscriptionId / smf-C, and then obtains the MSISDN from the UE-Node based on the IMSI. When the XDR carries both the IMSI and MSISDN, the IMSI and MSISDN relationship is updated to the UE-Node. The N3 interface associates the UPF-U information with the N11 / N4 interface to maintain the IMSI relationship, and then obtains the MSISDN from the UE-Node based on the IMSI; The N4 interface maintains the IMSI relationship by associating the upf-U information / ue_ip information with the N4 interface, and then obtains the MSISDN from the UE-Node based on the IMSI; Each 5G soft acquisition interface maintains the IMSI relationship by associating the S1-AP information with the S1-MME interface that has backfilled the IMSI, and then obtains the MSISDN from the UE-Node based on the IMSI.

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