CN110167052B - Pool technology-based AMF network element deployment system and operation method - Google Patents
Pool technology-based AMF network element deployment system and operation method Download PDFInfo
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- CN110167052B CN110167052B CN201910270944.3A CN201910270944A CN110167052B CN 110167052 B CN110167052 B CN 110167052B CN 201910270944 A CN201910270944 A CN 201910270944A CN 110167052 B CN110167052 B CN 110167052B
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Abstract
The invention discloses an AMF network element deployment system based on pool technology and an operation method thereof, comprising an AMF node pool and an AMF node control module connected with the AMF node pool; a plurality of AMF nodes are arranged in the AMF node pool and are respectively connected with the AMF node control module; the AMF node comprises a network interface layer, a protocol analysis layer and an application function layer which are sequentially connected, and the AMF node control module is arranged at the application function layer of the AMF node control center; the AMF node control module comprises a service registration discovery module and an automatic expansion control module; the invention can realize automatic expansion and contraction according to real-time performance in the system by performing virtualization design on the AMF nodes, and meanwhile, when a certain AMF node fails, a new AMF node can replace the failed AMF node through service call to continue providing service for the UE, and the UE does not need to perform registration, identity authentication and other operations to the network side again, thereby avoiding frequent signaling interaction process caused by network side failure.
Description
Technical Field
The invention belongs to the technical field of network communication, and particularly relates to an AMF network element deployment system based on a pool technology and an operation method.
Background
The traditional 4G core network elements such as MME are coupled with dedicated hardware, the upgrade of the network must involve the replacement of the device, and the high coupling between the network functions and the hardware is not favorable for the subsequent maintenance work. The 5G core network reconstructs the traditional network element by using the design concept of micro service. A microservice is a method for developing a single application as a suite of small services, each running in its own process and communicating with a lightweight mechanism (usually the API of an HTTP resource). Traditional network elements are divided into lighter-weight network functions, which are defined as relatively independent service modules that can be flexibly called, for example, an MME network element in 4G has an access control function, a mobility management function, and a session management function, and an MME entity in 5G is divided into two independent modules, namely, an AMF and an SMF, where the AMF is used for processing user access and mobility management and is responsible for processing a registration request and identity authentication of a user; SMF manages PDU sessions by establishing an N4 interface connection with the user plane. The mutual interaction between the AMF network function and the SMF network function is realized through the service interface, the design of the micro service has better independent expansibility, and the efficiency of the interface is improved.
In order to solve the problem that a single-point MME fails to work in a 4G network, the concept of an MME pool is introduced, a plurality of MMEs form the MME pool, all the MMEs in the pool serve the area served by the pool together, and when a connected user moves in the area served by the pool, a new attachment process is not needed.
MME pooling technology is currently widely used in 4G networks. The flow of the technique to achieve load balancing is described herein.
Step 1: the MME in the MME POOL periodically acquires the relative weight parameter of itself, creates S1 a configuration update request message, carries the relative weight parameter, and sends the message to the eNodeB.
Step 2: the UE sends an attach request message to the eNodeB.
Step 3: and the eNodeB analyzes the message after receiving the MME configuration updating request message sent by the MME, updates the relative weight parameter of the corresponding MME and selects the MME with the maximum weight for the UE to access.
The technology effectively solves the problem of single point failure of the MME and also ensures that each MME can uniformly process the requests in the network.
The problem of overload load of the MME is well solved by the POOL technology, but because of the high coupling of the MME and the special hardware in the 4G network, the number of the MME in one MME POOL is fixed, the difficulty of increasing the number of the MME in the POOL is high, the number of the MME nodes in the POOL can not be dynamically adjusted according to the user request, the maintenance is inconvenient, meanwhile, along with the continuous expansion of the service requirement, the upgrading of the hardware also needs to be considered, and therefore, the operation and maintenance cost is too high for operators. When the existing core network is designed and deployed for network functions, the above-mentioned drawbacks are not yet overcome, and further improvement is urgently needed.
Disclosure of Invention
The invention aims to provide an AMF network element deployment system and an operation method based on a pool technology aiming at the problem that the service cannot be normally provided and the service is shared when a single node of a core network fails at present.
In order to achieve the purpose, the invention adopts the technical scheme that:
an AMF network element deployment system based on pool technology comprises an AMF node pool and an AMF node control module connected with the AMF node pool; a plurality of AMF nodes are arranged in the AMF node pool and are respectively connected with the AMF node control module; the AMF node comprises a network interface layer, a protocol analysis layer and an application function layer which are connected in sequence; the network interface layer is used for communication between the AMF node and other network nodes (the other network nodes refer to a UE end network node and an AMF node control module); the protocol analysis layer is used for analyzing and packaging data transmitted between the protocol analysis layer and the network interface layer as well as the application function layer; the application function layer is used for access management, service calling and timing monitoring of the AMF; the AMF node control module comprises a service registration discovery module and an automatic expansion control module; the service registration discovery module is used for providing a service registration function and a service discovery function; and the automatic scaling control module is used for adjusting the quantity of the AMF nodes in the AMF node pool according to the quantity of the UE initiating the request to the core network side.
Specifically, the network interface layer comprises an N2 interface and a Namf interface; the N2 interface is used for connection between the AMF node and the RAN node; the Namf interface is used for connecting the AMF node and the NF node.
Specifically, the protocol analysis layer comprises a NAS message processing module, a NG-AP message processing module and a HTTP/2 message processing module; the NAS message processing module is connected with the NG-AP message processing module; the NG-AP message processing module transmits data with an N2 interface of a network interface layer through an SCTP protocol; and the HTTP/2 message processing module transmits data with a Namf interface of a network interface layer through a UDP protocol.
Specifically, the application function layer comprises an access management module, a service calling module and a telescopic monitoring module; the access management module is used for realizing the access management function of the AMF; the service calling module is used for realizing the function of calling service from one AMF node to another AMF node; the flexible monitoring module is used for monitoring the CPU occupancy rate of the virtual machine where the current AMF node is located at fixed time.
Specifically, the service registration discovery module defines a service registration discovery center in a configuration file of each service when the service is started, and then registers node information of the service to the service registration center, that is, provides a service registration function; and the service consumer side subscribes the service to be called according to the configuration file, and the service registration discovery module acquires the address information of the service to be called from the local cache and executes the remote calling service.
Corresponding to the AMF network element deployment system, the present invention also provides an operation method of the AMF network element deployment system based on the pool technology, which specifically comprises the following steps:
s1, UE initiates a registration request to the first AMF node, the request is received by the network interface layer of the first AMF node, then is analyzed by the protocol analysis layer, and finally is sent to the application function layer by the protocol analysis layer;
s2, the application function layer sends a series of NGAP commands to the UE, after the UE successfully responds to the NGAP commands sent by the application function layer, the UE sends a registration completion message to the application function layer of the first AMF node, and at the moment, the UE normally obtains services from the network side;
s3, when the application function layer monitors that the number of the UE connected with the first AMF node is excessive, the first AMF node sends a service migration request message to the AMF node control module;
s4, the AMF node control module selects a second AMF node which is idle at present in the AMF node pool, and informs the second AMF node to replace the first AMF node to continue to provide service for the UE;
s5, the second AMF node obtains the registration message of the UE through the first AMF node, and informs the UE that the first AMF node does not provide service at this time, and the second AMF node continues to provide service;
s6, the UE updates the AMF node identification, and the UE is connected with the second AMF node to continue to acquire service from the network side.
Further, when the number of the UE connected with all the AMF nodes in the AMF node pool is too large/too small, the AMF node control module calculates the most appropriate number of the AMF nodes in the AFM node pool according to the number of the UE connected with the AMF node pool, and increases/reduces the number of the AMF nodes in the AMF node pool through the automatic expansion control module.
Specifically, in step S1, the protocol parsing layer parses the registration request initiated by the UE through the NG-AP message processing module.
Specifically, in step S2, the NGAP instruction includes UE identity authentication and UE context establishment.
Specifically, the AMF node control module selects the AMF node which is idle currently according to the CPU occupancy rate of the virtual machine in which the AMF node in the AMF node pool is located.
Compared with the prior art, the invention has the beneficial effects that: (1) according to the AMF node pool, the AMF nodes are arranged in the AMF node pool, all the AMF nodes are monitored through the AMF node control module, the number of the AMF nodes in the AMF node pool is dynamically regulated and controlled by detecting the CPU occupancy rate of the virtual machine where each AMF node is located, and the phenomena that the AMF node service is congested due to the fact that the number of requests in a network is too large and the AMF node resources are wasted due to the fact that the number of requests in the network is too small are avoided; (2) in the AMF node pool, when a certain AMF node has a fault or the connection quantity is excessive, a new AMF node can call the new AMF node to replace the fault AMF node through service to continuously provide service for the UE, and the UE does not need to perform registration, identity authentication and other operations to the network side again, so that the frequent signaling interaction process caused by the fault of the network side is avoided.
Drawings
FIG. 1 is a schematic block diagram of the overall structure of an AMF node of the present invention;
FIG. 2 is a schematic block diagram of the overall architecture of an AMF node control module of the present invention;
FIG. 3 is a schematic block diagram of the overall structure of the AMF node pool of the present invention;
fig. 4 is a flowchart illustrating a service migration method for an AMF node pool in embodiment 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 to 3, the present embodiment provides an AMF network element deployment system based on a pool technology, including an AMF node pool and an AMF node control module connected to the AMF node pool; a plurality of AMF nodes are arranged in the AMF node pool and are respectively connected with the AMF node control module; the AMF node comprises a network interface layer, a protocol analysis layer and an application function layer which are connected in sequence; the network interface layer is used for communication between the AMF node and other network nodes (the other network nodes refer to a UE end network node and an AMF node control module); the protocol analysis layer is used for analyzing and packaging data transmitted between the protocol analysis layer and the network interface layer as well as the application function layer; the application function layer is used for access management, service calling and timing monitoring of the AMF; the AMF node control module comprises a service registration discovery module and an automatic expansion control module; the service registration discovery module is used for providing a service registration function and a service discovery function; and the automatic scaling control module is used for adjusting the quantity of the AMF nodes in the AMF node pool according to the quantity of the UE initiating the request to the core network side.
Specifically, the AMF node control module is arranged at an application function layer of an AMF node control center, the AMF node control center comprises a network interface layer, a protocol analysis layer and an application function layer, and the service registration discovery module and the automatic scaling control module are arranged at the application function layer; the protocol analysis layer is used for analyzing and packaging communication messages between the AMF node control module and the AMF nodes; the network interface layer is used for obtaining communication connection with the AMF node.
Specifically, the network interface layer comprises an N2 interface and a Namf interface; the N2 interface is used for connection between the AMF node and the RAN node; the Namf interface is used for connecting the AMF node and the NF node.
Specifically, the protocol analysis layer comprises a NAS message processing module, a NG-AP message processing module and a HTTP/2 message processing module; the NAS message processing module is connected with the NG-AP message processing module; the NG-AP message processing module transmits data with an N2 interface of a network interface layer through an SCTP protocol; and the HTTP/2 message processing module transmits data with a Namf interface of a network interface layer through a UDP protocol.
Specifically, the application function layer comprises an access management module, a service calling module and a telescopic monitoring module;
the access management module is used for realizing the access management function of the AMF and has an interface management function, a UE context management function, a UE message initialization function, an NAS transmission function, a UE registration/logout request function and an identity authentication function; when UE sends a first NAS message registration request message to an AMF node, an N2 interface connection is firstly required to be established between the RAN node and the AMF node, when the RAN node receives the first NAS message from the UE, an initial UE message flow is initiated, the flow belongs to an NGAP function flow, meanwhile, the NAS message is packaged in an NAS PDU cell of the NGAP message and is transparently forwarded by the RAN node, after the AMF node receives the initial UE message, the RAN NGAP UE ID is analyzed out, whether the UE executes the initial UE message or not is checked, and if not, a structural body is allocated for the UE to store the related information of the UE. And then the AMF node initiates an identity request to the UE through downlink NAS transmission, and the UE responds to the identity message after receiving the message. After receiving the UE identity response, the AMF node initiates an initial UE context request message to the UE and sends a registration receiving message, namely the UE is accessed to the AMF node.
The service calling module is used for realizing the function that one AMF node calls service to another AMF node, when the AMF node provides service to the outside, the AMF node is a service providing end, and the service providing end is responsible for providing service providers with service information (service name, IP address where the AMF node is located, and the like) registration, service ports and other operations; when the AMF consumes the service, the AMF is used as a service consumption end, and the service consumption end wants to call the service and needs related information of the calling service, such as an address of a service method;
the automatic expansion control module updates the information of the current AMF node after receiving the message and judges whether expansion operation needs to be executed according to the latest value of the CPU occupancy rate of the virtual machine in which the current AMF node is located; when the number of the UE connected with all the AMF nodes in the AMF node pool is excessive/insufficient, the AMF node control module calculates the most appropriate number of the AMF nodes in the AFM node pool according to the number of the UE connected with the AMF node pool at present, and increases/reduces the number of the AMF nodes in the AMF node pool through the automatic expansion control module.
Specifically, the service registration discovery module defines a service registration discovery center in a configuration file of each service when the service is started, and then registers node information of the service to the service registration center, that is, provides a service registration function; and the service consumer side subscribes the service to be called according to the configuration file, and the service registration discovery module acquires the address information of the service to be called from the local cache and executes the remote calling service.
Example 2
As shown in fig. 4, this embodiment provides a service migration method for an AMF network element deployment system based on a pool technology, and the method specifically includes the following steps:
step 1: the AMF node which is providing for the user can not provide the service continuously due to some problems (congestion or failure caused by excessive connection), and sends problem information to the control center to indicate that the service migration is needed at the moment, wherein the information comprises the address information of the AMF node;
step 2: the control center selects an AMF node with a lower CPU occupancy rate in the AMF node pool;
and step 3: and the control center sends a notice to the selected new AMF node, wherein the message comprises the IP address of the old AMF node, and the new AMF node is notified to go to the old AMF node to acquire the context information of the user.
And 4, step 4: a service calling module of the new AMF node acquires the service which can be provided by the old AMF node through a service registration discovery module of the control center, and calls the service from the old AMF node through an API (application programming interface) interface to acquire the context information of the UE;
and 5: the old AMF node responds to the data requested by the new AMF node, and the information of the user UE already exists in the new AMF node at the moment;
step 6: the old AMF node informs the user UE that the user UE cannot provide services at the moment, provides a new AMF node address for the UE, and informs the UE to continue to acquire the services from the new AMF node;
and 7: the UE initiates a service request to the new AMF to acquire the service, and because the new AMF node acquires the UE context from the old AMF node at the moment, the UE does not need to perform the procedures of initial UE information, identity authentication, UE context establishment and the like, and the UE is connected with the new AMF node to continuously acquire the service from the network side.
In this embodiment, in the AMF node pool of this embodiment, when a certain AMF node fails or the number of connections is too large, a new AMF node can call the new AMF node through a service to replace the failed AMF node to continue providing services for the UE, and the UE does not need to perform operations such as registration and authentication to the network side again, thereby avoiding a frequent signaling interaction process due to a network side failure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An AMF network element deployment system based on pool technology is characterized by comprising an AMF node pool and an AMF node control module connected with the AMF node pool; a plurality of AMF nodes are arranged in the AMF node pool and are respectively connected with the AMF node control module; the AMF node comprises a network interface layer, a protocol analysis layer and an application function layer which are connected in sequence; the network interface layer is used for communication between the AMF node and other network nodes; the protocol analysis layer is used for analyzing and packaging data transmitted between the protocol analysis layer and the network interface layer as well as the application function layer; the application function layer is used for access management, service calling and timing monitoring of the AMF; the AMF node control module comprises a service registration discovery module and an automatic expansion control module; the service registration discovery module is used for providing a service registration function and a service discovery function; and the automatic scaling control module is used for adjusting the quantity of the AMF nodes in the AMF node pool according to the quantity of the UE initiating the request to the core network side.
2. The AMF network element deployment system based on pool technology as claimed in claim 1, wherein said network interface layer comprises N2 interface and Namf interface; the N2 interface is used for connection between the AMF node and the RAN node; the Namf interface is used for connecting the AMF node and the NF node.
3. The AMF network element deployment system based on pool technology as claimed in claim 1, wherein the protocol parsing layer comprises a NAS message processing module, a NG-AP message processing module and a HTTP/2 message processing module; the NAS message processing module is connected with the NG-AP message processing module; the NG-AP message processing module transmits data with an N2 interface of a network interface layer through an SCTP protocol; and the HTTP/2 message processing module transmits data with a Namf interface of a network interface layer through a UDP protocol.
4. The AMF network element deployment system based on pool technology as claimed in claim 1, wherein said application function layer comprises an access management module, a service invocation module and a flexible monitoring module; the access management module is used for realizing the access management function of the AMF; the service calling module is used for realizing the function of calling service from one AMF node to another AMF node; the flexible monitoring module is used for regularly monitoring the CPU occupancy rate of the virtual machine where the current AMF node is located.
5. The AMF network element deployment system based on pool technology as claimed in claim 1, wherein the service registration discovery module provides a service registration function by defining a service registration discovery center in a configuration file of each service when the service is started, and then registering node information of the service to the service registration center; and the service consumer side subscribes the service to be called according to the configuration file, and the service registration discovery module acquires the address information of the service to be called from the local cache and executes the remote calling service.
6. An operation method of an AMF network element deployment system based on a pool technology, the operation method being based on the AMF network element deployment system of claim 1, characterized by comprising the steps of:
s1, UE initiates a registration request to the first AMF node, the request is received by the network interface layer of the first AMF node, then is analyzed by the protocol analysis layer, and finally is sent to the application function layer by the protocol analysis layer;
s2, the application function layer sends a series of NGAP commands to the UE, after the UE successfully responds to the NGAP commands sent by the application function layer, the UE sends a registration completion message to the application function layer of the first AMF node, and at this time, the UE normally obtains services from the network side;
s3, when the application function layer monitors that the number of the UE connected with the first AMF node is excessive, the first AMF node sends a service migration request message to the AMF node control module;
s4, the AMF node control module selects a second AMF node which is idle at present in the AMF node pool, and informs the second AMF node to replace the first AMF node to continue to provide service for the UE;
s5, the second AMF node obtains the registration message of the UE through the first AMF node, and informs the UE that the first AMF node does not provide service at this time, and the second AMF node continues to provide service;
and S6, the UE updates the AMF node identification, and the UE is connected with the second AMF node to continue to acquire service from the network side.
7. The method for operating the AMF network element deployment system based on the pool technology as claimed in claim 6, further comprising:
when the number of the UE connected with all the AMF nodes in the AMF node pool is excessive/insufficient, the AMF node control module calculates the most appropriate number of the AMF nodes in the AFM node pool according to the number of the UE connected with the AMF node pool at present, and increases/reduces the number of the AMF nodes in the AMF node pool through the automatic expansion control module.
8. The method of claim 6, wherein in step S1, the protocol resolution layer resolves the registration request initiated by the UE through the NG-AP message processing module.
9. The method of claim 6, wherein in step S2, the NGAP command includes UE identity authentication and UE context establishment.
10. The method according to claim 6, wherein in step S4, the AMF node control module selects the current relatively idle AMF node according to a CPU occupancy of a virtual machine in which the AMF node in the AMF node pool is located.
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| CN111417151B (en) * | 2020-03-27 | 2021-10-08 | 广州爱浦路网络技术有限公司 | Method and system for backing up AMF in 5G core network |
| WO2022151030A1 (en) * | 2021-01-13 | 2022-07-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for automatic configuration of ng control plane interface |
| CN112965698B (en) * | 2021-03-26 | 2023-07-18 | 东软睿驰汽车技术（沈阳）有限公司 | Automatic driving software architecture platform, construction method and construction device |
| CN115208748B (en) * | 2021-04-13 | 2024-10-01 | 瞻博网络公司 | Network controller horizontal scaling for network device configuration session management |
| CN113422694B (en) * | 2021-06-08 | 2024-07-12 | 腾讯科技（深圳）有限公司 | Communication method, device, medium and electronic equipment |
| CN117580089B (en) * | 2024-01-15 | 2024-04-05 | 东方通信股份有限公司 | AMF overload detection and control implementation method |
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