CN111417151B - Method and system for backing up AMF in 5G core network - Google Patents

Method and system for backing up AMF in 5G core network Download PDF

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CN111417151B
CN111417151B CN202010226692.7A CN202010226692A CN111417151B CN 111417151 B CN111417151 B CN 111417151B CN 202010226692 A CN202010226692 A CN 202010226692A CN 111417151 B CN111417151 B CN 111417151B
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amf
backup
amf set
nrf
kth
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CN111417151A (en
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邱权冠
苏国章
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Guangzhou Aipu Road Network Technology Co Ltd
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Guangzhou Aipu Road Network Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H04L41/0833—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability for reduction of network energy consumption
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application provides a method for backing up AMF in a 5G core network, wherein the core network comprises a network resource management function NRF, a first AMF set, a second AMF set and a general AMF set, any one backup AMF in the general AMF set supports backup as the first AMF set or the second AMF set, the NRF manages network resources of the first AMF set, the second AMF set and the general AMF set, and the method comprises the following steps: the NRF determines that the first set of AMFs is overloaded; and the NRF determines a kth backup AMF from the general AMF set and indicates that the kth backup AMF is added into the first AMF set for service, wherein k is a positive integer less than or equal to S.

Description

Method and system for backing up AMF in 5G core network
Technical Field
The present invention relates to the field of communications, and in particular, to a method and a system for backing up an AMF in a 5G core network.
Background
The tidal effect of urban population and a large amount of sporadic registered accesses in the internet of things equipment may cause 5G network overload, cause impact and breakdown on Core Access and Mobility Management functions (AMFs), and cause overload on other AMFs in an AMF set (denoted as AMFset) due to AMF failure in the 5GC, so that disaster recovery backup of the AMFs is required to ensure normal operation of the 5 GC.
The traditional disaster recovery backup mode has the following defects in 5GC AMF disaster recovery backup: since the AMFs in different amfsets in the 5GC may belong to different slice networks, one AMF supporting a corresponding slice needs to be backed up for all AMFs, which greatly increases the network deployment cost, and the increased large number of backed-up AMFs also causes the energy consumption of the 5GC to increase, thus increasing the network operation cost of the 5 GC.
Therefore, a method for disaster recovery backup of AMF in 5GC is needed to improve the utilization rate of network resources.
Disclosure of Invention
The embodiment of the application provides a method for backing up an AMF in a 5G core network and network equipment thereof, which can improve the utilization rate of network resources.
In a first aspect, a method for providing backup AMFs in a 5G core network is provided, where the core network includes a network resource management function NRF, a first AMF set, a second AMF set, and a generic AMF set, where any backup AMF in the generic AMF set supports backup as a first AMF set or a second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the generic AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the generic AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the method includes: the NRF determines that the first set of AMFs is overloaded; and the NRF determines a kth backup AMF from the general AMF set and indicates that the kth backup AMF is added into the first AMF set for service, wherein k is a positive integer less than or equal to S.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the method further includes: when the NRF determines that the load of the first AMF set is recovered to be normal, a first notification message is sent to the first k backup AMFs, wherein the first notification message is used for indicating that the network slice information of the kth backup AMF is changed to be null, and notifying the kth backup AMF to enter a dormant state, and indicating that the kth backup AMF is added into the general AMF set again.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the method further includes updating the generic AMF set, including: the NRF receives a registration request message of a jth AMF, wherein the registration request message carries NF _ Type; when the NF _ Type carried in the registration request message is uAMF, determining that the jth AMF is a backup AMF, and adding the jth AMF into the general AMF set; and the NRF returns a registration success response to the jth AMF, wherein the registration success response indicates that the jth AMF is a backup AMF, and the jth AMF is in an idle state according to the registration success response.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the NRF determining that the first AMF set is overloaded includes: receiving the load of each first AMF in the first AMF set, and determining the average load of the first AMF set as Ave ═ ((L1+ L2+ L3+ Ls.. + Ln))/N, wherein the load of the s-th first AMF is Ls, s is more than or equal to 0 and less than or equal to N, and N is N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF; when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
With reference to the first aspect and the foregoing implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the NRF determining that the first AMF set is overloaded further includes: and when the NRF does not receive the heartbeat signal of the s-th first AMF within a threshold time period T, determining that the s-th first AMF fails, and deleting the data of the s-th first AMF, wherein s is more than or equal to 0 and less than or equal to N.
With reference to the first aspect and the foregoing implementation manner, in a fifth possible implementation manner of the first aspect, the determining, by the NRF, a kth backup AMF from the generic AMF set, and indicating that the kth backup AMF is added to the first AMF set for service includes: selecting the backup AMF with the largest quantity of TAI (cross target index) with the first AMF from the general AMFs as the kth backup AMF; and sending a second notification message to the kth backup AMF, wherein the second notification message is used for indicating that the network slice information of the kth backup AMF is updated to the first network slice information corresponding to the first AMF set, indicating that the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, and the second notification message also carries the TAI supported by the first AMF set.
With reference to the first aspect and the foregoing implementation manner, in a sixth possible implementation manner of the first aspect, when the NRF determines that the load of the first AMF set is restored to normal, the method indicates that the network slice information of the kth backup AMF is changed to null, and notifies the kth backup AMF to enter a dormant state, and indicates that the kth backup AMF is rejoined in the generic AMF set, includes: when the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Lk.. + Ln))/(N-1) < S (AMFset)), the NRF collects the average load of the first AMF set in three continuous heartbeat signals, and when the average load of the first AMF set is (Ave (delta T) + Ave (2 x delta T) + Ave (3 x delta T))/3< S (AMFset)), the load of the first AMF set is judged to be recovered to be normal, wherein Lk is the load corresponding to the kth backup AMF after the first AMF set is added, k is more than or equal to 0 and less than or equal to N, and S (AMFset) is a set load normal standard value.
In a second aspect, a method for backing up an AMF in a 5G core network is provided, where the core network includes a network resource management function NRF, a first AMF set, a second AMF set, and a generic AMF set, where any one backup AMF in the generic AMF set supports backup as a first AMF set or a second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the generic AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the generic AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, the method includes:
receiving, by a kth backup AMF in the generic AMF set, a second notification message sent by the NRF, where the second notification message carries a corresponding GUAMI of the first AMF set and a TAI supported by the first AMF set;
the kth backup AMF updates first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF updates the GUAMI corresponding to the first AMF set, wherein the kth backup AMF is determined from the general AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S;
and sending a second configuration data update message to a target gNB of the TAI supported by the first AMF set, wherein the second configuration data update message is used for indicating the UE of the target gNB to register with the kth backup AMF.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: the kth backup AMF in the S backup AMFs receives a first notification message sent by the NRF; the kth backup AMF changes the network slice information into null according to the first notification message, and changes an IE value of Relative AMF Capacity in the first configuration update message into 0; sending the first configuration update message to a gNB, indicating that a target user UE registered with the kth backup AMF is unregistered, and indicating that the target user UE is registered with other AMFs in the first AMF; and when the kth backup AMF completes the whole de-registration of the target UE, changing the network slice information of the kth backup AMF into null, and adding the network slice information into the general AMF set again.
In a third aspect, a network resource management function NRF is provided, where a core network includes the NRF, a first AMF set, a second AMF set, and a generic AMF set, where any backup AMF in the generic AMF set supports backup of the first AMF set or the second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the generic AMF set, where the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the generic AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, S is a positive integer, and the NRF is configured to: determining that the first set of AMFs is overloaded; and determining a kth backup AMF from the general AMF set, and indicating the kth backup AMF to be added into the first AMF set for service, wherein k is a positive integer less than or equal to S.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the NRF is further configured to: when the NRF determines that the load of the first AMF set is recovered to be normal, a first notification message is sent to the first k backup AMFs, wherein the first notification message is used for indicating that the network slice information of the kth backup AMF is changed to be null, and notifying the kth backup AMF to enter a dormant state, and indicating that the kth backup AMF is added into the general AMF set again.
With reference to the third aspect, in a second possible implementation manner of the third aspect, the NRF is further configured to: receiving a registration request message of the jth AMF, wherein the registration request message carries the NF _ Type; when the NF _ Type carried in the registration request message is uAMF, determining that the jth AMF is a backup AMF, and adding the jth AMF into the general AMF set; and the NRF returns a registration success response to the jth AMF, wherein the registration success response indicates that the jth AMF is a backup AMF, and the jth AMF is in an idle state according to the registration success response.
With reference to the third aspect, in a third possible implementation manner of the third aspect, the NRF is configured to: receiving the load of each first AMF in the first AMF set, and determining that the average load of the first AMF set is Ave ═ (L1+ L2+ L3+ Ls.. + Ln)/N, wherein the load of the s-th first AMF is Ls, s is more than or equal to 0 and less than or equal to N, and N ═ N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF; when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the NRF is configured to: and when the NRF does not receive the heartbeat signal of the s-th first AMF within a threshold time period T, determining that the s-th first AMF fails, and deleting the data of the s-th first AMF, wherein s is more than or equal to 0 and less than or equal to N.
With reference to the third aspect, in a fifth possible implementation manner of the third aspect, the NRF is configured to: selecting the backup AMF with the largest quantity of TAI (cross target index) with the first AMF from the general AMFs as the kth backup AMF; and sending a second notification message to the kth backup AMF, wherein the second notification message is used for indicating that the network slice information of the kth backup AMF is updated to the first network slice information corresponding to the first AMF set, indicating that the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, and the second notification message also carries the TAI supported by the first AMF set.
With reference to the third aspect, in a sixth possible implementation manner of the third aspect, the NRF is configured to: when the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Lk.. + Ln))/(N-1) < S (AMFset)), the NRF collects the average load of the first AMF set in three continuous heartbeat signals, and when the average load of the first AMF set is (Ave (delta T) + Ave (2 x delta T) + Ave (3 x delta T))/3< S (AMFset)), the load of the first AMF set is judged to be recovered to be normal, wherein Lk is the load corresponding to the kth backup AMF after the first AMF set is added, k is more than or equal to 0 and less than or equal to N, and S (AMFset) is a set load normal standard value.
In a fourth aspect, an AMF in a 5G core network is proposed, the core network comprising a network resource management function NRF, a first set of AMFs, a second set of AMFs, a generic set of AMFs, any one backup AMF in the set of generic AMFs supports backup as either the first set of AMFs or the second set of AMFs, wherein the NRF performs network resource management on the first set of AMFs, the second set of AMFs and the generic set of AMFs, the first AMF set comprises N first AMFs supporting a first network slice, the second AMF set comprises M second AMFs supporting a second network slice, the general AMF set comprises S backup AMFs, M is a positive integer, N is a positive integer, S is a positive integer, the kth backup AMF in the general AMF set is used for receiving a second notification message sent by the NRF, the second notification message carries the corresponding GUAMI of the first AMF set and the TAI supported by the first AMF set; the kth backup AMF is further configured to update first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S; the kth backup AMF is further configured to send a second configuration data update message to a target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB registers with the kth backup AMF.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, a kth backup AMF of the S backup AMFs is configured to receive a first notification message sent by the NRF; changing the network slice information into null according to the first notification message, and changing the IE value of Relative AMF Capacity in the first configuration update message into 0; the kth backup AMF is further configured to send the first configuration update message to a gNB, indicate that a target user UE registered with the kth backup AMF is deregistered, and indicate that the target user UE is registered with other AMFs in the first AMF; and after all target UE deregisters, changing the network slice information of the kth backup AMF into null, and adding the network slice information into the general AMF set again.
In a fifth aspect, a system for backup disaster recovery in a 5G core network is provided, where the system includes a network resource management function NRF, a first AMF set, a second AMF set, and a general AMF set, where any one backup AMF in the general AMF set supports backup as a first AMF set or a second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the general AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the general AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, S is a positive integer, and the NRF is used to determine that the first AMF set is overloaded; the NRF is further used for determining a kth backup AMF from the general AMF set, indicating that the kth backup AMF is added into the first AMF set for service, and k is a positive integer less than or equal to S; the kth backup AMF in the generic AMF set is used for receiving a second notification message sent by the NRF, wherein the second notification message carries a corresponding GUAMI of the first AMF set and a TAI supported by the first AMF set; the kth backup AMF is further configured to update first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S; the kth backup AMF is further configured to send a second configuration data update message to a target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB registers with the kth backup AMF.
In the embodiment of the application, one universal AMF or one universal AMF set is used as backup disaster tolerance of all AMF sets supporting different slices in the 5GC, so that the cost of network deployment is reduced; the general AMF can reduce the energy consumption of the 5GC through a sleep mode and reduce the operation cost of the 5 GC; the universal AMF realizes the dynamic change of the GUAMI function of the AMF slice set and the AMF through the algorithm cooperation of NRF.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a network topology diagram of a related art AMF backup disaster recovery method.
FIG. 2 shows a 5GC network topology according to an embodiment of the present application
Fig. 3 shows a 5GC network topology of another embodiment of the present application.
FIG. 4 shows a schematic flow diagram of a method of one implementation of the present application.
Fig. 5 shows a flow chart of access 5GC communication according to an embodiment of the present application.
FIG. 6 shows a schematic network topology diagram of a method of one embodiment of the present application.
Fig. 7 shows a schematic network topology diagram of a method of another embodiment of the present application.
FIG. 8 shows a schematic flow chart of a method of one embodiment of the present application.
Fig. 9 shows a schematic network topology diagram of a method of another embodiment of the present application.
Fig. 10 shows a schematic flow chart of a method of yet another embodiment of the present application.
Figure 11 shows an algorithmic schematic of the NRF determining the kth backup AMF from the generic AMF set.
FIG. 12 shows a schematic flow chart of a method of one embodiment of the present application.
Fig. 13 illustrates a method for backing up an AMF in a 5G core network according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 shows a network topology diagram of an AMF backup disaster recovery method in the prior art, in the diagram, AMF _1 and AMF _2 backup each other, when AMF _1 or AMF _2 fails, the other AMF can ensure normal operation of 5GC, and the pressure of AMF in 5GC is reduced through backup AMF and load balancing, so as to prevent impact on 5GC when a large number of users use AMF service.
However, in the conventional AMF backup disaster recovery method, since the AMFs in each AMFset may all belong to different slice networks, a backup AMF needs to be deployed in each AMFset, which may cause an increase in network deployment cost and an increase in network energy consumption due to a large number of backup AMFs.
Fig. 2 shows a 5GC network topology of an embodiment of the present application, or fig. 2 shows a schematic system block diagram of an embodiment of the present application, in which there are two amfsets supporting different network slices and one uAMF accessing 5 GC. When the uAMF accesses the 5GC, the uAMF enters a sleep power-saving state and only exchanges heartbeat messages with the NRF. When one of the AMFsets is overloaded or the AMFsets are overloaded due to the failure of the AMF in a certain AMFset, the backup uAMF is added into the corresponding AMFset under the control of the NRF and provides service together with the AMF in the corresponding AMFset, so that the network pressure is relieved.
Specifically, in the embodiment illustrated in fig. 2, the common AMF set includes only one backup AMF, S is 1, i.e., uAMF shown in fig. 2, the first AMF set is AMFset _1 in fig. 2, the AMFset _1 includes 2 AMFs, i.e., AMF _1 and AMF _2, N is 2, and the second AMF set is AMFset _2 in fig. 2 includes 2 AMFs, i.e., AMF _ a and AMF _ b, and M is 2.
In addition, the figure also shows 5G base stations gNB accessing the core network, including gNB _1, gNB _2, and the like.
Fig. 3 shows a 5GC network topology of another embodiment of the present application. Fig. 3 is a network topology diagram of uamfet access to 5GC, when there are a large number of uamfets in 5GC, a plurality of uamfs are needed to provide backup disaster recovery service for 5GC, and all uamfs can be combined into one uamfet.
Specifically, in the embodiment illustrated in fig. 3, the common AMF set is uAMFset, S is 2, which includes uAMF _ i and uAMF _ ii, the first AMF set is AMFset _1 in fig. 3, the AMFset _1 includes 2 AMFs, i.e., AMF _1 and AMF _2, N is 2, and the second AMF set is AMFset _2 in fig. 3 includes 2 AMFs, i.e., AMF _ a and AMF _ b, and M is 2.
In addition, the figure also shows a 5G base station gNB accessing the core network, which includes gNB _1, gNB _2, and so on, and is not described again.
Fig. 4 shows a schematic flowchart of a method implemented by the present application, where the core network includes a network resource management function NRF, a first AMF set, a second AMF set, and a generic AMF set, where any backup AMF in the generic AMF set supports backup as the first AMF set or the second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the generic AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the generic AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, as shown in fig. 4, and the method 400 includes:
step 410, the NRF determining that the first set of AMFs is overloaded;
step 420, the NRF determines a kth backup AMF from the generic AMF set, and instructs the kth backup AMF to add to the first AMF set for service, where k is a positive integer less than or equal to S.
Specifically, in step 410, the NRF determines that there is AMF set overload in the network,
that is to say, the NRF manages the generic AMF set, and when the first AMF set or the second AMF set needs to backup the AMF, the NRF instructs the backup AMF in the generic AMF set to add to the first AMF set and/or the second AMF set, so that the disaster-tolerant backup can be provided for the AMF in the 5G core network.
It should be understood that the first and second frames referred in this embodiment are only for distinguishing different AMF sets or AMFs, and there is no sequential effect, and it should be understood that the core network may further include other AMF sets, such as a third AMF set, and the like, and this application is not limited thereto.
Optionally, as an embodiment of the present application, the method further includes updating the generic AMF set, including: the NRF receives a registration request message of a jth AMF, wherein the registration request message carries NF _ Type; when the NF _ Type carried in the registration request message is uAMF, determining that the jth AMF is a backup AMF, and adding the jth AMF into the general AMF set; and the NRF returns a registration success response to the jth AMF, wherein the registration success response indicates that the jth AMF is a backup AMF, and the jth AMF is in an idle state according to the registration success response.
That is, after the NRF receives the registration request message of the AMF, if the AMF is identified as the backup AMF, it is added to the generic AMF set.
Fig. 5 shows a flow chart of access 5GC communication according to an embodiment of the present application.
Step one, when a jth AMF (namely uAMF in the figure) is powered on and started after being accessed to a 5GC, a registration request message is sent to an NRF;
step two, when the NRF identifies that the NF _ Type in the registration request message sent by the jth AMF is uAMF, the jth AMF is determined to be uAMF, and as the jth AMF does not belong to any slice network, the NRF does not allocate the jth AMF to other network elements to access the services of the jth AMF, and returns a registration success response;
step three, when the jth AMF receives the connection request of the base station gNB, a Relative AMF Capacity information element IE carried in the response message is set to be 0, and according to the regulation in the TS 3GPP 23501-g30 protocol, when the value of the IE is 0, the gNB does not allocate the UE registration message to the AMF;
since the current jth AMF does not provide service to any network element, it is in idle state, and will enter into sleep power saving mode, and only timing and NRF maintain heartbeat message, indicating that it has been accessed into 5 GC.
It should be understood that each uAMF access 5GC procedure in the above generic AMF set is the same as a single uAMF access 5GC procedure, and will not be described again.
That is to say, the uAMF in the generic AMF set is used as the backup AMF, which can effectively save network resources.
Optionally, as an embodiment of the present application, the NRF determining that the first AMF set is overloaded includes: receiving the load of each first AMF in the first AMF set, and determining the average load of the first AMF set as Ave ═ ((L1+ L2+ L3+ Ls.. + Ln))/N, wherein the load of the s-th first AMF is Ls, s is more than or equal to 0 and less than or equal to N, and N is N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF; when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
Specifically, the load of the first AMF is carried in a heartbeat message sent by the first AMF to the NRF.
It should be understood that the first AMF set may be any one of AMFset in the core network, where o (AMFset) is a preset value, for example, o (AMFset) is 90%, and it should be further understood that the NRF may also collect an average load in other continuous heartbeat signals as a criterion for determining whether the first AMF set is overloaded, which is not limited in this application.
For example, the first AMF set has three AMFs in total, the loads are 91%, 95% and 87%, respectively, then (91% + 95% + 87%)/3 is 91%, 90% is the overload standard value, and when the average load value of 91% is greater than the overload standard value, the overload risk determination process is started. In the overload risk judgment process, the NRF needs to collect an average load value of three AMFs in the first AMF set in three heartbeat messages, and assuming that a time interval of each heartbeat is Δ T, an overload judgment formula is obtained:
(Ave(ΔT)+Ave(2*ΔT)+Ave(3*ΔT))/3>O(AMFset)
if the average value of the three heartbeat loads and the overload standard value make the above equation to be true, the flow of activating uAMF to join the overloaded AMFset for providing service is started.
Optionally, as an embodiment of the present application, the NRF determining that the first AMF set is overloaded further includes: and when the NRF does not receive the heartbeat signal of the s-th first AMF within a threshold time period T, determining that the s-th first AMF fails, and deleting the data of the s-th first AMF, wherein s is more than or equal to 0 and less than or equal to N.
Then, receiving the load of each first AMF in the first AMF set, and determining that the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Ls.. + Ln))/N, wherein the load of the s-th first AMF is Ls, s is greater than or equal to 0 and less than or equal to N, and N is N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF; when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
Fig. 6 shows a schematic network topology diagram of the method according to an embodiment of the present application, as shown in fig. 6, when an NRF finds that AMFset _1 (first AMF set) where AMF _1 is located is in danger of overload through load algorithm calculation, it starts to activate uAMF (k-th backup AMF in common AMF set), gives uAMF the same network slice information as AMF in AMFset _1, and adds uAMF into AMFset _1 for providing service, thereby relieving the network pressure of AMFset _ 1.
Fig. 7 shows a schematic network topology diagram of a method according to another embodiment of the present application, as shown in fig. 7, when one uAMF set (generic AMF set) is deployed in the 5GC, when an NRF calculates that an overload situation will occur in multiple amfsets, the NRF may activate and allocate different uAMF in uAMF sets in the uAMF sets according to a uAMF allocation algorithm to join in corresponding AMFset providing services, so as to relieve network stress.
Specifically, the process of selecting the backup AMF from the generic AMF set and adding the backup AMF into the AMFset has been described in the foregoing embodiments, and is not described herein again.
Optionally, as an embodiment of the present application, the NRF determining a kth backup AMF from the generic AMF set, and instructing the kth backup AMF to join the first AMF set for service includes: selecting the backup AMF with the largest quantity of TAI (cross target index) with the first AMF from the general AMFs as the kth backup AMF; and sending a second notification message to the kth backup AMF, wherein the second notification message is used for indicating that the network slice information of the kth backup AMF is updated to the first network slice information corresponding to the first AMF set, indicating that the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, and the second notification message also carries the TAI supported by the first AMF set.
Fig. 8 shows a schematic flow chart of a method of an embodiment of the present application, as shown in fig. 8:
when AMF _1 and AMF _2 periodically send heartbeat messages to NRF respectively and update their own load data through the timing heartbeat messages, that is, the heartbeat messages sent by AMF _1 and AMF _2 respectively carry their own load information.
The NRF calculates the corresponding AMFset from the load data in AMF _1 and AMF _2 through a load algorithm to have overload risk, and starts to activate the flow of determining uAMF to be added into the AMFset for providing service.
In the process, the NRF selects a uAMF from a uAMFset (universal AMF set), and simultaneously sends a second notification message to the uAMF, wherein the second notification message carries network slice information supported by the AMFset where AMF _1 and AMF _2 are located and a Globally Unique AMF Identifier (English: Global Unique AMF Identifier, abbreviated as GUAMI) corresponding to the AMFset;
in addition, the second notification message also carries a 5GS Tracking Area Identity (English: 5GS Tracking Area Identity, abbreviated as TAI) supported in the corresponding AMFset;
and after receiving the notification message, the uAMF (the kth backup AMF selected from the generic AMF set) receiving the second notification message changes its GUAMI, and sends an AMF configuration data update message (a second configuration data update message) to the gbb supporting the corresponding TAI, where the second configuration data update message is used to indicate that the UE in the gbb receiving the second configuration data update message registers with the uAMF, and an IE value of a Relative AMF Capacity carried in the second configuration data update message changes to a non-zero value, and starts to accept UE registration in the corresponding gbb.
Fig. 9 shows a schematic network topology diagram of a method of another embodiment of the present application. In the figure, AMF _1 in AMFset _1 is in failure, so that users on the AMF are off-line and go on-line again through AMF _2, the service pressure of AMF _2 is greatly increased, and when NRF calculates through a load algorithm that AMF _2 in AMFset _1 has overload danger, uAMF is allocated to enter AMFset _1 to distribute network pressure.
Fig. 10 shows a schematic flow diagram of a method of yet another embodiment of the present application, as shown in fig. 11:
when AMF _1 (the s-th first AMF) fails and is disconnected from NRF, and meanwhile, the NRF does not receive heartbeat messages of AMF _1 within a certain time (threshold time period T, for example, T can be 1 second), deleting data of AMF _ 1;
when the NRF identifies that the load data of AMF _2 is in danger of overload through calculation (namely, the load of the first AMF set is in danger of data overload), uAMF (k-th backup AMF) is allocated from the general AMF set, the allocated uAMF slice information and GUAMI are changed to be consistent with corresponding information in AMFset through a notification message (the second notification message), and the uAMF is activated to be added into the AMFset for providing services;
and after the GUAMI is changed by the uAMF, sending an AMF configuration updating message to the gNB consistent with the TAI in the AMFset, changing the IE value of Relative AMF Capacity, starting to accept the registration of the UE in the corresponding gNB, and sharing the network pressure of the AMFset.
In this process, the load calculation algorithm is consistent with the algorithm of the overload activation uAMF, and the uAMF allocation algorithm is the same, which will not be described again.
Figure 11 shows an algorithmic schematic of the NRF determining the kth backup AMF from the generic AMF set.
Specifically, in the figure, the basis for the NRF to judge that uAMF _1 or uAMF _2 in the generic AMF set is added to AMFset (first AMF) for providing service is as follows: the AMFset respectively and the number of TAIs in the intersection of the uAMF _1 and the uAMF _2, the uAMF with the larger number in the intersection is preferentially selected for distribution, if the number of the uAMF _1 and the uAMF _2 in the intersection of the TAIs in the AMFset is the same as that in the intersection of the TAIs in the uAMF _1 and the uAMF _2, one uAMF is randomly distributed and added into the AMFset for providing services, and the formula is as follows:
TAIs(AMFset)∩TAIs(uAMF_n)＝Sum(uAMF_n)
{Sum(uAMF_1),Sum(uAMF_2),Sum(uAMF_3),...,Sum(AMF_n)}max
in the above formula, the TAI of each uAMF and AMFset is calculated by using the union set and the total number of TAIs is collected, stored in Sum (uAMF _ n), and then the uAMF with the maximum value is selected from Sum (uAMF _ n) of each calculated AMF and added in AMFset for providing service.
Optionally, as an implementation of the present application, the method further includes: when the NRF determines that the load of the first AMF set is recovered to be normal, a first notification message is sent to the first k backup AMFs, wherein the first notification message is used for indicating that the network slice information of the kth backup AMF is changed to be null, and notifying the kth backup AMF to enter a dormant state, and indicating that the kth backup AMF is added into the general AMF set again.
That is, when the load of the first AMF set in the network is recovered to normal, the backup AMF participating in the first AMF set will not continue to be served, will enter into a dormant state, and rejoin the generic AMF set.
Optionally, as an embodiment of the present application, when the NRF determines that the load of the first AMF set is restored to normal, indicating that the network slice information of the kth backup AMF is changed to null, and notifying the kth backup AMF to enter a dormant state, and indicating that the kth backup AMF rejoins the generic AMF set, includes:
when the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Lk.. + Ln))/(N-1) < S (AMFset)), the NRF collects the average load of the first AMF set in three continuous heartbeat signals, and when the average load of the first AMF set is (Ave (delta T) + Ave (2 x delta T) + Ave (3 x delta T))/3< S (AMFset)), the load of the first AMF set is judged to be recovered to be normal, wherein Lk is the load corresponding to the kth backup AMF after the first AMF set is added, k is more than or equal to 0 and less than or equal to N, and S (AMFset) is a set load normal standard value.
In particular, fig. 12 shows a schematic flow chart of a method of one embodiment of the present application.
Fig. 12 specifically shows a uAMF (the k-th backup AMF) re-dormancy communication flow chart, in which the flow:
when the NRF is calculated through load data in AMF heartbeat messages in AMFset (including uAMF allocated into the AMFset), the AMFset is recovered to be normal and has no overload risk, the slice information of the uAMF is changed to be null and the GUAMI of the original uAMF is recovered through a first notification message, and the uAMF is notified to start sleeping;
after receiving a dormancy notification (a first notification message) of the NRF, the uAMF sends a configuration update message (a first configuration data update message) to the gNB, and changes an IE value of Relative AMF Capacity to 0, namely no UE registration request is received;
the uAMF registers the registered users one by one at the same time, and the users register and connect with other AMFs under the AMFset again;
after the uAMF registers all users, the uAMF changes the GUAMI back, successfully separates the user from the AMFset back to the uAMFset, and enters a sleep power-saving mode.
Judging a normal algorithm formula for load recovery in the AMFset:
(L1+L2+L3+...+Ln)/(n-1)＝Ave<S(AMFset)
in the above formula, L1 to Ln are n AMF loads in the AMFset (including uAMF added to the AMFset), Ave is the total load value divided by the average load value when uAMF is not present, s (AMFset) is the set normal standard value of load, and is a percentage such as 70%, if the above equation is true, the load recovery normal process is started, in the process judgment, Ave of the time interval Δ T needs to be collected three times, and the following formula is:
(Ave(ΔT)+Ave(2*ΔT)+Ave(3*ΔT))/3<S(AMFset)
if the above equation is true, it can be determined that the load or fault in AMFset has recovered to normal, and uAMF can resume the hibernation province mode.
Fig. 13 shows a method 1300 for backing up AMFs in a 5G core network according to an embodiment of the present application, where the core network includes a network resource management function NRF, a first AMF set, a second AMF set, and a generic AMF set, where any one backup AMF in the generic AMF set supports backup as the first AMF set or the second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the generic AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the generic AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the method includes: step 1310, the kth backup AMF in the generic AMF set receives a second notification message sent by the NRF, where the second notification message carries the corresponding GUAMI of the first AMF set and the TAI supported by the first AMF set; step 1320, the kth backup AMF updates the first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF updates the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S; step 1330, sending a second configuration data update message to the target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB is registered with the kth backup AMF.
Optionally, as an embodiment of the present application, the method further includes: the kth backup AMF in the S backup AMFs receives a first notification message sent by the NRF; the kth backup AMF changes the network slice information into null according to the first notification message, and changes an IE value of Relative AMF Capacity in the first configuration update message into 0; sending the first configuration update message to a gNB, indicating that a target user UE registered with the kth backup AMF is unregistered, and indicating that the target user UE is registered with other AMFs in the first AMF; and when the kth backup AMF completes the whole de-registration of the target UE, changing the network slice information of the kth backup AMF into null, and adding the network slice information into the general AMF set again.
The following describes the network devices NRF and AMF related to the present application and the network system related to the above method with reference to the above flow method, and the specific method flow is not described again.
Optionally, as an embodiment of the present application, a network resource management function NRF is provided, where a core network includes the NRF, a first AMF set, a second AMF set, and a general AMF set, where any backup AMF in the general AMF set supports backup as the first AMF set or the second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the general AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the general AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the NRF is configured to: determining that the first set of AMFs is overloaded; and determining a kth backup AMF from the general AMF set, and indicating the kth backup AMF to be added into the first AMF set for service, wherein k is a positive integer less than or equal to S.
Optionally, as an embodiment of the present application, the NRF is further configured to: and when determining that the load of the first AMF set is recovered to normal, sending a first notification message to the first k backup AMFs, where the first notification message is used to indicate that the network slice information of the kth backup AMF is changed to null, and notify the kth backup AMF to enter a dormant state, and indicate that the kth backup AMF rejoins the generic AMF set.
Optionally, as an embodiment of the present application, the NRF is further configured to: receiving a registration request message of the jth AMF, wherein the registration request message carries the NF _ Type; when the NF _ Type carried in the registration request message is uAMF, determining that the jth AMF is a backup AMF, and adding the jth AMF into the general AMF set; and the NRF returns a registration success response to the jth AMF, wherein the registration success response indicates that the jth AMF is a backup AMF, and the jth AMF is in an idle state according to the registration success response.
Optionally, as an embodiment of the present application, the NRF is configured to: receiving the load of each first AMF in the first AMF set, and determining that the average load of the first AMF set is Ave ═ (L1+ L2+ L3+ Ls.. + Ln)/N, wherein the load of the s-th first AMF is Ls, s is more than or equal to 0 and less than or equal to N, and N ═ N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF; when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
Optionally, as an embodiment of the present application, the NRF is configured to: and when the NRF does not receive the heartbeat signal of the s-th first AMF within a threshold time period T, determining that the s-th first AMF fails, and deleting the data of the s-th first AMF, wherein s is more than or equal to 0 and less than or equal to N.
Optionally, as an embodiment of the present application, the NRF is configured to: selecting the backup AMF with the largest quantity of TAI (cross target index) with the first AMF from the general AMFs as the kth backup AMF; and sending a second notification message to the kth backup AMF, wherein the second notification message is used for indicating that the network slice information of the kth backup AMF is updated to the first network slice information corresponding to the first AMF set, indicating that the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, and the second notification message also carries the TAI supported by the first AMF set.
Optionally, as an embodiment of the present application, the NRF is configured to: when the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Lk.. + Ln))/(N-1) < S (AMFset)), the NRF collects the average load of the first AMF set in three continuous heartbeat signals, and when the average load of the first AMF set is (Ave (delta T) + Ave (2 x delta T) + Ave (3 x delta T))/3< S (AMFset)), the load of the first AMF set is judged to be recovered to be normal, wherein Lk is the load corresponding to the kth backup AMF after the first AMF set is added, k is more than or equal to 0 and less than or equal to N, and S (AMFset) is a set load normal standard value.
Optionally, as an embodiment of the present application, an AMF in a 5G core network is provided, where the core network includes a network resource management function NRF, a first AMF set, a second AMF set, a generic AMF set, any one backup AMF in the set of generic AMFs supports backup as either the first set of AMFs or the second set of AMFs, wherein the NRF performs network resource management on the first set of AMFs, the second set of AMFs and the generic set of AMFs, the first AMF set comprises N first AMFs supporting a first network slice, the second AMF set comprises M second AMFs supporting a second network slice, the general AMF set comprises S backup AMFs, M is a positive integer, N is a positive integer, S is a positive integer, the kth backup AMF in the general AMF set is used for receiving a second notification message sent by the NRF, the second notification message carries the corresponding GUAMI of the first AMF set and the TAI supported by the first AMF set; the kth backup AMF is further configured to update first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S; the kth backup AMF is further configured to send a second configuration data update message to a target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB registers with the kth backup AMF.
Optionally, as an embodiment of the present application, a kth backup AMF of the S backup AMFs is configured to receive a first notification message sent by the NRF; changing the network slice information into null according to the first notification message, and changing the IE value of Relative AMF Capacity in the first configuration update message into 0; the kth backup AMF is further configured to send the first configuration update message to a gNB, indicate that a target user UE registered with the kth backup AMF is deregistered, and indicate that the target user UE is registered with other AMFs in the first AMF; and after all target UE deregisters, changing the network slice information of the kth backup AMF into null, and adding the network slice information into the general AMF set again.
Optionally, a system for backup disaster recovery in a 5G core network is provided, where the system includes a network resource management function NRF, a first AMF set, a second AMF set, and a general AMF set, where any one backup AMF in the general AMF set supports backup as the first AMF set or the second AMF set, where the NRF performs network resource management on the first AMF set, the second AMF set, and the general AMF set, the first AMF set includes N first AMFs supporting a first network slice, the second AMF set includes M second AMFs supporting a second network slice, the general AMF set includes S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the NRF is used to determine that the first AMF set is overloaded; the NRF is further used for determining a kth backup AMF from the general AMF set, indicating that the kth backup AMF is added into the first AMF set for service, and k is a positive integer less than or equal to S; the kth backup AMF in the generic AMF set is used for receiving a second notification message sent by the NRF, wherein the second notification message carries a corresponding GUAMI of the first AMF set and a TAI supported by the first AMF set; the kth backup AMF is further configured to update first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S; the kth backup AMF is further configured to send a second configuration data update message to a target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB registers with the kth backup AMF.
In the embodiment of the application, one universal AMF or one universal AMF set is used as backup disaster tolerance of all AMF sets supporting different slices in the 5GC, so that the cost of network deployment is reduced; the general AMF can reduce the energy consumption of the 5GC through a sleep mode and reduce the operation cost of the 5 GC; the universal AMF realizes the dynamic change of the GUAMI function of the AMF slice set and the AMF through the algorithm cooperation of NRF.
Those of ordinary skill in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the steps and elements of the various embodiments have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The methods or steps described in connection with the embodiments disclosed herein may be embodied in hardware, a software program executed by a processor, or a combination of both. The software routines may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or alterations to the embodiments of the present invention may be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications or alterations are intended to be within the scope of the present invention.

Claims (10)

1. A method for backing up access and mobility management function (AMF) in a 5G core network, wherein the core network comprises a network resource management function (NRF), a first AMF set, a second AMF set and a universal AMF set, any backup AMF in the universal AMF set supports backup of the first AMF set or the second AMF set, the NRF performs network resource management on the first AMF set, the second AMF set and the universal AMF set, the first AMF set comprises N first AMFs supporting a first network slice, the second AMF set comprises M second AMFs supporting a second network slice, the universal AMF set comprises S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the method comprises:
the NRF determines that the first set of AMFs is overloaded;
and the NRF determines a kth backup AMF from the general AMF set and indicates that the kth backup AMF is added into the first AMF set for service, wherein k is a positive integer less than or equal to S.
2. The method of claim 1, further comprising:
when the NRF determines that the load of the first AMF set is recovered to be normal, a first notification message is sent to the kth backup AMF, wherein the first notification message is used for indicating that the network slice information of the kth backup AMF is changed to be null, and notifying the kth backup AMF to enter a dormant state, and indicating that the kth backup AMF is added into the general AMF set again.
3. The method of claim 2, further comprising updating the generic AMF set, including:
the NRF receives a registration request message of a jth AMF, wherein the registration request message carries NF _ Type;
when the NF _ Type carried in the registration request message is uAMF, determining that the jth AMF is a backup AMF, and adding the jth AMF into the general AMF set;
and the NRF returns a registration success response to the jth AMF, wherein the registration success response indicates that the jth AMF is a backup AMF, and the jth AMF is in an idle state according to the registration success response.
4. The method of claim 3, wherein the NRF determines that the first set of AMFs is overloaded, comprising:
receiving the load of each first AMF in the first AMF set, and determining that the average load of the first AMF set is Ave ═ (L1+ L2+ L3+ Ls.. + Ln)/N, wherein the load of the s-th first AMF is Ls, s is more than or equal to 0 and less than or equal to N, and N ═ N, and the load of the first AMF is carried in the heartbeat signal reported by the first AMF;
when Ave > o (amfset), the NRF collects an average load of the first AMF set in three consecutive heartbeat signals, and when (Ave (Δ T) + Ave (2 × Δ T) + Ave (3 × Δ T))/3> o (amfset)), determines that the first AMF set is overloaded, where o (amfset) is a preset overload criterion value, a heartbeat signal time interval is Δ T, Ave (Δ T) is an average load of the first AMF set in a first heartbeat signal, Ave (2 × Δ T) is an average load of the first AMF set in a second heartbeat signal, and Ave (3 × Δ T) is an average load of the first AMF set in a third heartbeat signal.
5. The method of claim 4, wherein the NRF determining that the first set of AMFs is overloaded further comprises:
and when the NRF does not receive the heartbeat signal of the s-th first AMF within a threshold time period T, determining that the s-th first AMF fails, and deleting the data of the s-th first AMF, wherein s is more than or equal to 0 and less than or equal to N.
6. The method of claim 5, wherein the NRF determines a kth backup AMF from the set of generic AMFs, and wherein instructing the kth backup AMF to join the first set of AMFs for service comprises:
selecting the backup AMF with the largest quantity of TAI (cross target index) with the first AMF from the general AMFs as the kth backup AMF;
and sending a second notification message to the kth backup AMF, wherein the second notification message is used for indicating that the network slice information of the kth backup AMF is updated to the first network slice information corresponding to the first AMF set, indicating that the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, and the second notification message also carries the TAI supported by the first AMF set.
7. The method as claimed in claim 6, wherein when the NRF determines that the first AMF set is load restored normally, sending a first notification message to the kth backup AMF, where the first notification message is used to indicate that the network slice information of the kth backup AMF is changed to null, and notify the kth backup AMF to enter a dormant state, and indicate that the kth backup AMF rejoins the generic AMF set, the method includes:
when the average load of the first AMF set is Ave ═ ((L1+ L2+ L3+ Lk.. + Ln))/(N-1) < S (AMFset)), the NRF collects the average load of the first AMF set in three continuous heartbeat signals, and when the average load of the first AMF set is (Ave (delta T) + Ave (2 x delta T) + Ave (3 x delta T))/3< S (AMFset)), the load of the first AMF set is judged to be recovered to be normal, wherein Lk is the load corresponding to the kth backup AMF after the first AMF set is added, k is more than or equal to 0 and less than or equal to N, and S (AMFset) is a set load normal standard value.
8. A method for backing up AMFs in a 5G core network is characterized in that the core network comprises a network resource management function NRF, a first AMF set, a second AMF set and a universal AMF set, any backup AMF in the universal AMF set supports backup of the first AMF set or the second AMF set, wherein the NRF performs network resource management on the first AMF set, the second AMF set and the universal AMF set, the first AMF set comprises N first AMFs supporting a first network slice, the second AMF set comprises M second AMFs supporting a second network slice, the universal AMF set comprises S backup AMFs, M is a positive integer, N is a positive integer, and S is a positive integer, and the method comprises the following steps:
receiving, by a kth backup AMF in the generic AMF set, a second notification message sent by the NRF, where the second notification message carries a corresponding GUAMI of the first AMF set and a TAI supported by the first AMF set;
the kth backup AMF updates first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF updates the GUAMI corresponding to the first AMF set, wherein the kth backup AMF is determined from the general AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S;
and sending a second configuration data update message to a target gNB of the TAI supported by the first AMF set, wherein the second configuration data update message is used for indicating the UE of the target gNB to register with the kth backup AMF.
9. The method of claim 8, further comprising:
the kth backup AMF in the S backup AMFs receives a first notification message sent by the NRF;
the kth backup AMF changes the network slice information into null according to the first notification message, and changes an IE value of Relative AMF Capacity in the first configuration update message into 0;
sending the first configuration update message to a gNB, indicating that a target user UE registered with the kth backup AMF is unregistered, and indicating that the target user UE is registered with other AMFs in the first AMF;
and when the kth backup AMF completes the whole de-registration of the target UE, changing the network slice information of the kth backup AMF into null, and adding the network slice information into the general AMF set again.
10. The system for backup disaster recovery in a 5G core network is characterized by comprising a network resource management function NRF, a first AMF set, a second AMF set and a universal AMF set, wherein any backup AMF in the universal AMF set supports backup as the first AMF set or the second AMF set, the NRF performs network resource management on the first AMF set, the second AMF set and the universal AMF set, the first AMF set comprises N first AMFs supporting a first network slice, the second AMF set comprises M second AMFs supporting a second network slice, the universal AMF set comprises S backup AMFs, M is a positive integer, N is a positive integer, S is a positive integer, and the NRF is used for determining that the first AMF set is overloaded;
the NRF is further used for determining a kth backup AMF from the general AMF set, indicating that the kth backup AMF is added into the first AMF set for service, and k is a positive integer less than or equal to S;
the kth backup AMF in the generic AMF set is used for receiving a second notification message sent by the NRF, wherein the second notification message carries a corresponding GUAMI of the first AMF set and a TAI supported by the first AMF set;
the kth backup AMF is further configured to update first network slice information corresponding to the first AMF set according to the second notification message, and the GUAMI of the kth backup AMF is updated to the GUAMI corresponding to the first AMF set, where the kth backup AMF is determined from the generic AMF set when the NRF determines that the first AMF set is overloaded, and k is a positive integer less than or equal to S;
the kth backup AMF is further configured to send a second configuration data update message to a target gNB of the TAI supported by the first AMF set, where the second configuration data update message is used to indicate that the UE of the target gNB registers with the kth backup AMF.
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