CN117939530A - Network slice management method, system and communication network - Google Patents
Network slice management method, system and communication network Download PDFInfo
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Abstract
The invention discloses a network slice management method, a system and a communication network, wherein the method comprises the following steps: when congestion of a first slice instance based on the first network slice is detected, constructing a temporary second slice instance based on the second network slice through a network slice selection function; establishing a second session management function managed by a second slice instance, and constructing a new second PDU session based on the second session management function; the first session management function associated with the first slice instance releases the original first PDU session. Based on the network slice management method, when congestion of the first network slice instance is detected, the temporary second slice instance based on the second network slice is dynamically constructed, so that the load of the original slice instance can be effectively relieved, and service interruption and quality degradation caused by resource congestion are reduced.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a network slice management method, a system, and a communications network.
Background
With the development of 5G communication technology, network slicing becomes a key technology for realizing effective management of network resources and optimizing service quality. Network slicing allows operators to virtualize multiple logical networks on the same physical network infrastructure, each network slicing being independently configurable to meet the needs of different traffic scenarios. This approach increases the flexibility and efficiency of the network, particularly when faced with different users and service types.
However, as the number of users and data traffic increases, particular network slice instances may experience resource congestion, which can negatively impact quality of service and user experience. Specifically, the network slice consists of two parts, RAN and 5GC, each network slice is uniquely identified by S-NSSAI, one NSI (network slice instance) may be associated with multiple S-NSSAI in PLMN (public land mobile network), and each S-NSSAI uses different network resources, when the terminal establishes a PDU session, the requested S-nsai is determined according to URSP (user routing policy) rules, the PDU session is initially associated with this requested S-NSSAI (the core network cannot determine whether the slice is congested), during PDU session establishment, when the requested S-NSSAI is congested in the area of interest, the network cannot change S-NSSAI association, which may lead to abnormal communication for the user using the slice.
To solve this problem, the current network management system needs a mechanism capable of dynamically adjusting resources and loads to maintain efficient operation of the network and continuity of service.
Conventional solutions typically involve simply limiting new session requests or degrading quality of service when network slice instances are congested, which often do not fundamentally solve the problem and may even lead to significant degradation of the user experience.
Thus, a new approach is needed to dynamically manage network slices.
Disclosure of Invention
The invention aims to provide a network slice management method, a system and a communication network, wherein when a network slice instance serving terminal equipment is congested, a network can be switched to a new network slice instance in a lossless manner.
In order to achieve the above object, the present invention discloses a network slice management method, which includes:
when congestion of a first slice instance based on the first network slice is detected, constructing a temporary second slice instance based on the second network slice through a network slice selection function;
Establishing a second session management function managed by the second slice instance, and constructing a new second PDU session based on the second session management function;
The first session management function associated with the first slice instance releases the original first PDU session.
Preferably, after congestion relief of the first slice instance is detected, the first slice instance is connected to a network, and at the same time, configuration resources of the second slice instance are released.
Preferably, subscription analysis is performed on the first slice instance based on the network data analysis function NWDAF to detect the state of the first slice instance.
Preferably, when the NWDAF detects that the first slice instance is congested, a first mobility management function AMF corresponding to the first slice instance is notified, and the first AMF requests to a network slice selection function to construct the second slice instance.
Preferably, when the second slice instance is successfully constructed, the network slice selection function selects a second AMF to serve the second slice instance, the second AMF establishes the second PDU session, and releases the first PDU session.
The invention also discloses a communication network comprising a slicing server, which operates based on the network slicing management method as described above.
The invention also discloses a network slice management system, which comprises:
One or more processors;
A memory;
And one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the network slice management method as described above.
The invention also discloses a computer readable storage medium comprising a computer program executable by a processor to perform the network slice management method as described above.
Compared with the prior art, the technical scheme of the invention discloses a network slice management method, wherein firstly, when congestion of a first network slice instance is detected, a temporary second slice instance based on a second network slice is dynamically constructed, so that the load of the original slice instance can be effectively relieved, and service interruption and quality degradation caused by resource congestion are reduced. And secondly, by establishing a new second session management function and establishing a new second PDU session based on the function, the continuity of network service is ensured, and the response speed and flexibility of the network to different service requirements are improved. In addition, the scheme also allows the original first PDU session to release the old first PDU session, thereby optimizing the resource allocation and improving the overall operation efficiency of the network.
Drawings
Fig. 1 is a flowchart illustrating a signaling execution of a network slice management method according to an embodiment of the present invention.
Fig. 2 is a flowchart of an example handover of a network slice in an embodiment of the present invention.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.
The embodiment discloses a network slice management method, which is used for managing services of network slices in a mobile communication network, wherein the communication network in the embodiment is a 5G network or a next generation evolution type mobile communication network compatible with the 5G network. The management method comprises the following steps:
s1: when congestion of a first slice instance based on the first network slice is detected, constructing a temporary second slice instance based on the second network slice through a network slice selection function;
s2: establishing a second session management function managed by a second slice instance, and constructing a new second PDU session based on the second session management function;
S3: the first session management function associated with the first slice instance releases the original first PDU session.
For example, in a busy urban area, a large number of users are connected to the same 5G network. To meet the demands of this area for high density data transmission and communication services, a specific network slice (identified as S-NSSAI 1) is deployed. As the number of users and data traffic increases, the instance of the S-NSSAI network slice deployed in this area (i.e., the first slice instance) begins to experience congestion, affecting quality of service and data transmission speed.
Upon detecting that a congestion occurs in a certain instance of the S-NSSAI network slice, the network automatically initiates a slice management flow.
To alleviate congestion, a temporary network slice instance based on different network slice identifications (S-NSSAI) is dynamically constructed. This new slice instance (i.e., the second slice instance) is equipped with the necessary resources and service parameters, specifically for handling additional network traffic.
The network simultaneously establishes a new session management function associated with the S-NSSAI network slice instance. In this way, a new data transfer session (second PDU session) is constructed supporting efficient transfer of traffic.
At the same time, session management of the original S-NSSAI1 network slice instance begins to gradually release the PDU session (first PDU session) associated therewith. This process aims to ease the burden of the original slice instance while guaranteeing that the user services are not affected.
The user has almost imperceptibly transitioned from the congested S-NSSAI1 slice instance to the new S-NSSAI2 temporary slice instance in this process. The method ensures the continuity and quality of service of data transmission, and simultaneously, the congestion of the original S-NSSAI slice example is effectively relieved, and the network performance is recovered.
On the other hand, after the congestion relief of the first slice instance is detected, the first slice instance is accessed to the network, and meanwhile, the configuration resource of the second slice instance is released. In this embodiment, by dynamically adjusting the deployment and release of network slice instances, the network can more efficiently utilize resources. When the congestion problem of the first sliced instance is resolved, restarting its service means that the original network configuration and optimized resources can be utilized while freeing up the resources of the second sliced instance for other needs.
On the other hand, the specific switching flow when the slice instance is congested is: as shown in fig. 2, the subscription analysis is performed on the first clip instance based on the network data analysis function NWDAF to detect the state of the first clip instance. Also, when NWDAF detects that the first slice instance is congested, the first mobility management function AMF corresponding to the first slice instance is notified, and the first AMF requests the network slice selection function NSSF to construct the second slice instance.
In addition, when the second slice instance is successfully constructed, NSSF selects a second AMF to serve the second slice instance, the second AMF establishes a second PDU session through SMF2 (second session management function) and releases the first PDU session through SMF1 (first session management function).
As shown in fig. 1, the specific handover procedure of PDU session when network slice instance is congested is as follows:
1. UE registration and load information subscription: when a User Equipment (UE) registers online, an access and mobility management function (AMF) subscribes to the sliced load information with a network data analysis function (NWDAF) to monitor whether congestion occurs on a first sliced instance based on the first slice S-NSSAI 1.
2. The UE establishes a PDU session: the UE sends Registration Request to a Radio Access Network (RAN), the message contains parameters such as registration type, user identification, 5GC capability of the UE and optional Requested NSSAI, the RAN receives the message and selects proper AMF according to the user temporary identification or Requested NSSAI, if the RAN can not select proper AMF, registration Request is sent to the first AMF, the first AMF carries out AMF selection process, and the UE establishes PDU session according to URSP rule and carried S-NSSAI1
3. NWDAF data collection: NWDAF network elements collect data related to UE registration, such as the number of UE registrations, S-NSSAI slice information carried at the time of UE registration, S-NSSAI slice service list, etc.
4. Congestion detection and notification: when congestion occurs in the first slice instance, NWDAF detects and notifies the first AMF. The first AMF is informed that the first slice instance is congested, possibly resulting in a service outage or communication anomaly.
5. Request to build temporary slice instance: the first AMF sends a request to the Network Slicing Subsystem (NSSF) to construct an urgent, second slice S-NSSAI2 based, exclusive temporary slice instance, i.e., a second slice instance, to serve the UE.
6. NSSF process and notify AMF: NSSF, upon receiving the request, provide a temporary slice instance for the UE and select a new target AMF (i.e., a second AMF) to serve.
7. Second AMF and SMF coordination: after the second AMF receives the request, it notifies NWDAF that the second slice instance will serve the UE and notifies the session management function (SMF 1) to update the context to replace the second slice instance to serve the UE, establishing a new PDU session.
8. And (3) information interaction: the SMF1 responds to the request of the second AMF and sends a Network Attached Security (NAS) message of the second slice instance, and performs information interaction with the second AMF.
9. Transmitting information to the base station: and the second AMF transmits the information of the second slice instance service UE to the base station through the N2 interface.
10. The base station forwards to the UE: after receiving the N2 message of the second AMF, the base station forwards the N1 message to the UE, where the message includes the newly selected second slice instance.
11. The UE initiates a new PDU session: the UE initiates a PDU session request to the network by using the second slice instance, and the network establishes a new PDU session for the UE according to URSP rules and carried slice information S-NSSAI.
12. Release PDU session of original slice: the UE releases the PDU session of the first sliced instance and the network responds by releasing the PDU session of the first sliced instance.
13. Detecting the original slice state and switching back to: if NWDAF detects that the first slice instance is restored to normal, a handover procedure is performed according to steps 6 to 12, and the UE is handed back to the original slice, i.e. the first slice instance.
The process embodies flexible processing of dynamic resource management and network slicing in the 5G network so as to ensure continuity and quality of network service.
In summary, the embodiment of the invention discloses a network slice management method, and the technical scheme of the invention discloses a network slice management method, and firstly, when congestion of a first network slice example is detected, a temporary second slice example based on a second network slice is dynamically constructed, so that the load of the original slice example can be effectively relieved, and service interruption and quality degradation caused by resource congestion are reduced. And secondly, by establishing a new second session management function and establishing a new second PDU session based on the function, the continuity of network service is ensured, and the response speed and flexibility of the network to different service requirements are improved. In addition, the scheme also allows the original first PDU session to release the old first PDU session, thereby optimizing the resource allocation and improving the overall operation efficiency of the network.
In another preferred embodiment of the present invention, a communication network is also disclosed, which includes a slice server that operates based on the network slice management method in the above embodiment.
The present application also discloses a network slice management system comprising one or more processors, a memory, and one or more programs, wherein one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the network slice management method as described above. The processor may be a general-purpose central processing unit (Central Processing Unit, CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to execute related programs to implement the functions required to be performed by the modules in the network slice management system according to the embodiments of the present application, or to perform the network slice management method according to the embodiments of the present application.
The invention also discloses a computer readable storage medium comprising a computer program executable by a processor to perform the network slice management method as described above. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a read-only memory (ROM), or a random-access memory (random access memory, RAM), or a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape, a magnetic disk, or an optical medium, such as a digital versatile disk (DIGITAL VERSATILEDISC, DVD), or a semiconductor medium, such as a Solid State Disk (SSD), or the like.
Embodiments of the present application also disclose a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the electronic device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the electronic device performs the network slice management method described above.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (8)
1. A network slice management method, comprising:
when congestion of a first slice instance based on the first network slice is detected, constructing a temporary second slice instance based on the second network slice through a network slice selection function;
Establishing a second session management function managed by the second slice instance, and constructing a new second PDU session based on the second session management function;
The first session management function associated with the first slice instance releases the original first PDU session.
2. The network slice management method according to claim 1, wherein after congestion relief of the first slice instance is detected, the first slice instance is connected to the network, and at the same time, configuration resources of the second slice instance are released.
3. The network slice management method of claim 1, wherein the first slice instance is subjected to a subscription analysis based on a network data analysis function NWDAF to detect a state of the first slice instance.
4. The network slice management method of claim 3, wherein when the NWDAF detects that the first slice instance is congested, a first mobility management function AMF corresponding to the first slice instance is notified, and the first AMF requests construction of the second slice instance from a network slice selection function.
5. The network slice management method of claim 4, wherein the network slice selection function selects a second AMF to serve the second slice instance after the second slice instance is successfully constructed, the second AMF establishing the second PDU session and releasing the first PDU session.
6. A communication network comprising a slicing server operating based on the network slicing management method of any one of claims 1 to 5.
7. A network slice management system, comprising:
One or more processors;
A memory;
And one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the network slice management method of any one of claims 1 to 5.
8. A computer readable storage medium comprising a computer program executable by a processor to perform the network slice management method of any one of claims 1 to 5.
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