CN112911573B - Network element discovery method and NRF device for 4G/5G converged networking - Google Patents
Network element discovery method and NRF device for 4G/5G converged networking Download PDFInfo
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- CN112911573B CN112911573B CN202011581777.3A CN202011581777A CN112911573B CN 112911573 B CN112911573 B CN 112911573B CN 202011581777 A CN202011581777 A CN 202011581777A CN 112911573 B CN112911573 B CN 112911573B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/005—Discovery of network devices, e.g. terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/06—Registration at serving network Location Register, VLR or user mobility server
Abstract
The invention discloses a network element discovery method of 4G/5G converged networking and an NRF device used in the 4G/5G converged networking, wherein the device is used for realizing the method, and the method comprises the steps of sending a registration request message to the NRF, wherein the registration request message comprises configuration parameters of an EPC; the NF sends a registration request message to the NRF, wherein the registration request message comprises NF configuration parameters; the NRF conversion module converts the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writes the NF configuration parameters into a cache list of the NF/NF service configuration file; NRF writes NF configuration parameters in the NF registration request message into a cache list of the NF/NF service configuration file; the NRF receives a network element service discovery request and/or a subscription request, and retrieves a cache list of NF/NF service configuration files to determine whether service discovery is authorized; if the authorization service is found, the NRF returns a request response message to select the target network element instance according to the request response message. The invention realizes multi-network element management of 4G/5G fusion networking and improves user experience.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a network element discovery method and an NRF device for 4G/5G converged networking.
Background
Based on the current communication network stock condition, the future network development trend and other factors, in the early stage of 5G deployment, 4G/5G fusion is necessary for a long time to transition, so as to ensure the network experience of new and old users. And 5, building a 5G core network architecture on the basis of the 4G core network architecture, and subdividing and developing network element functions into new Network Functions (NF) on the basis of the purpose of separating a control plane from a user plane. The control surfaces NFs mainly include: an access and mobility management function entity AMF, a session management function entity SMF, an application function entity AF, a network slice selection function entity NSSF, a network open function entity NEF, a network storage function entity NRF, a policy control function entity PCF, an authentication server function entity AUSF and a unified data management entity UDM. The 4G/5G fusion can increase the number of network elements, make the networking more complicated, increase the number of network elements, increase the difficulty of discovery and selection among the network elements, and increase the workload of multi-network element management. However, currently, NRF only stores and manages 5GC NFs singly, and EPC and 5G NFs of 4G core network are not managed uniformly, which results in inflexible discovery and selection method of network elements of the converged networking and low efficiency.
Disclosure of Invention
The invention mainly aims to provide a network element discovery method of 4G/5G fusion networking, aiming at overcoming the problems.
In order to achieve the above object, the network element discovery method for 4G/5G converged networking provided by the present invention comprises the following steps:
s10 EPC sends registration request message to NRF, which includes configuration parameter of EPC; the NF sends a registration request message to the NRF, wherein the registration request message comprises NF configuration parameters;
the conversion module of the S20 NRF converts the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writes the NF configuration parameters into a cache list of the NF/NF service configuration file; NRF writes NF configuration parameters in the NF registration request message into a cache list of the NF/NF service configuration file;
s30 NRF receives the network element service discovery request and/or subscription request, and retrieves the cache list of NF/NF service configuration file to determine whether service discovery is authorized;
s40, if determining that the authorized service is found, the NRF returns a request response message to perform target network element instance selection according to the request response message.
Preferably, if the NRF receives an EPC-initiated service discovery request and/or subscription request, the method of S30 includes:
s301, the EPC initiates a service discovery request and/or a subscription request to the NRF, wherein the request comprises a target NF service name and the type of a target NF instance;
s302, the NRF retrieves a cache list of the NF/NF service configuration file, if a target NF instance or NF service instance is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
Preferably, when the NRF receives a service discovery request and/or a subscription request initiated by the EPC, the request response message returned in S40 includes a target NF instance of the discovery request and/or the subscription request and NF profiles of the target NF instance, and each NF profile includes necessary parameters output to the EPC.
Preferably, the necessary parameters output to the EPC include a type of the target NF, an address of the target NF instance, a target NF instance service list, a state of the target NF instance, a PLMN ID, a tracking area identification, a unique identification of the NF instance, and an S-nsais of the NF instance.
Preferably, if the NRF receives the NF-initiated service discovery request and/or the subscription request, the method of S30 includes:
s303 NRF receives a service discovery request and/or a subscription request initiated by NF, wherein the request comprises a target EPC network element name and a target EPC network element type;
s304 NRF retrieves the cache list of NF/NF service configuration files, if the target EPC network element is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
Preferably, when the NRF receives the NF initiation service discovery request and/or subscription request, the request response message returned in S40 includes EPC network element names, and the profile of the EPC network elements, where the profile of each EPC network element includes the necessary parameters output to the NF.
Preferably, the necessary parameters output to the NF include a type of the target EPC network element, an address of the target EPC network element, a service list of the target EPC network element, a status of the target EPC network element, a PLMN ID, a tracking area identifier, a unique identifier of the EPC network element, and an S-nsais of the EPC network element.
Preferably, said S20 is followed by:
s50NRF provides discovery service for EPC or NF and returns registration reply message.
Preferably, when the 4G network is started, the EPC sends a registration request message to the NRF; when the 5G network starts, the NF sends a registration request message to the NRF.
The invention also discloses an NRF device used in the 4G/5G converged networking, which comprises an NRF body used for network storage and NF management, and a conversion module used for converting the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writing the NF configuration parameters into a cache list of the NF/NF service configuration file.
According to the technical scheme, the 4G network elements are registered on the NRF, and the NRF stores and manages the 4G network elements and the 5G network elements in a unified mode, so that the accuracy of selection between the 4G/5G fusion networking network element examples is improved, the speed of network query processing is guaranteed, and the problems of inflexible discovery and selection modes and low efficiency among the network elements in the 4G/5G fusion networking are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a method according to an embodiment of the method of the present invention;
FIG. 2 is a flowchart of a method of one embodiment of S30;
figure 3 is a flowchart of another embodiment of the method of S30,
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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 only a part of the embodiments of the present invention, and not all of the 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.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
On the basis of a 4G core network architecture, a 5G core network is constructed, network element functions are subdivided, and a new network functional entity NF is evolved based on the purpose of separating a control plane from a user plane, wherein a functional entity NRF for storing and managing the NF in the NFs of the control plane is provided. The 5GC services architecture requires that each NF be started and registered with the NRF to provide service. The current reference to NFs is limited to 5G network function instances, however, i.e., NRF only stores and manages 5GC NFs. But in the early stage of 5G deployment, there is a long time period for ensuring the network experience of the new and old users through 4G/5G convergence. Therefore, 4G \5G network convergence is a necessary trend. The number of the network elements to be deployed is increased by fusing the 4G network element EPC and the 5GC, which will increase the deployment cost by planning opening a disk, increase the difficulty of discovery and selection among the network elements, and finally relate to the problem of multi-network-element management.
In order to solve the above problem, as shown in fig. 1, the method for discovering a network element of a 4G/5G converged networking proposed by the present invention includes the following steps:
s10 EPC sends registration request message to NRF, which includes configuration parameter of EPC; the NF sends a registration request message to the NRF, wherein the registration request message comprises NF configuration parameters;
the conversion module of the S20 NRF converts the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writes the NF configuration parameters into a cache list of the NF/NF service configuration file; NRF writes NF configuration parameters in the NF registration request message into a cache list of the NF/NF service configuration file;
s30 NRF receives the network element service discovery request and/or subscription request, and retrieves the cache list of NF/NF service configuration file to determine whether service discovery is authorized;
s40, if determining that the authorized service is found, the NRF returns a request response message to perform target network element instance selection according to the request response message.
In this embodiment, when the 4G core network is started, the present invention registers on the NRF through the 4G network element, the registration information includes EPC name, type, address, service list, etc., and provides discovered and discovered services, and the NRF stores and manages the network element instances of the 4G and 5G in a unified manner, so as to provide a discovery service for 4G/5G network element convergence and interworking. The main flow of discovery services is similar: the NF of the initiating terminal obtains the NF position and the state information of the target terminal needing to be communicated by sending a discovery request or a subscription request to the NRF, and then selects the NF service instance of the target terminal for communication.
The invention registers on NRF through 4G network element, and the NRF stores and manages 4G and 5G network elements in a unified way, thereby not only improving the accuracy of selection between 4G/5G fusion networking network element examples, but also ensuring the speed of network query processing, and simultaneously solving the problems of inflexible discovery and selection modes and low efficiency between the network elements in 4G/5G fusion networking.
Preferably, if the NRF receives an EPC-initiated service discovery request and/or subscription request, the method of S30 includes:
s301, the EPC initiates a service discovery request and/or a subscription request to the NRF, wherein the request comprises a target NF service name and the type of a target NF instance;
s302, the NRF retrieves a cache list of the NF/NF service configuration file, if a target NF instance or NF service instance is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
In this embodiment, as shown in fig. 2, the EPC of the present invention sends a registration request message to an NRF, where the registration request message carries configuration information related to an EPC network element, and the NRF receives a service discovery request initiated by the EPC network element, where the request carries a target NF service name, a NF type of a target NF instance, and the like. The NRF retrieves the NF/NF service profile and the type of the NF instance in a cache list of the NF/NF service profile to determine whether to allow the EPC network element to discover the target NF instance. Since the target NF instance can only be discovered by the NF in the same network slice, if the target NF instance or NF service instance is deployed in a certain network slice, the NRF authorizes the discovery request and/or subscription request according to the discovery configuration (e.g., network configuration) of the network slice.
Preferably, when the NRF receives a service discovery request and/or a subscription request initiated by the EPC, the request response message returned in S40 includes a target NF instance of the discovery request and/or the subscription request and NF profiles of the target NF instance, and each NF profile includes necessary parameters output to the EPC.
In this embodiment, the NRF returns a request response message to the requesting EPC, retrieves a set of NF instances for which the determined internal policy matches, and sends the NF profile for the determined NF instances.
Preferably, the necessary parameters output to the EPC include a type of the target NF, an address of the target NF instance, a target NF instance service list, a state of the target NF instance, a PLMN ID, a tracking area identification, a unique identification of the NF instance, and an S-nsais of the NF instance.
In this embodiment, each NF profile contains the necessary parameters for export to EPC network elements as shown in table one:
| attribute name | Description of the invention |
| target-nfType | Type of target NF |
| target-nfAddress | Addresses of target NF instances |
| target-nfServices | Target NF instance service list |
| target-nfStatus | Status of target NF instance |
| Plmn ID | PLMN ID |
| TAIs | Tracking area identification |
| nfInstanceId | Unique identification of NF instances |
| sNssais | Of NF examplesS-NSSAIS |
Watch 1
And the EPC network element performs NF instance selection according to the information parameters returned by the NRF.
Preferably, if the NRF receives the NF-initiated service discovery request and/or the subscription request, the method of S30 includes:
s303 NRF receives a service discovery request and/or a subscription request initiated by NF, wherein the request comprises a target EPC network element name and a target EPC network element type;
s304 NRF retrieves the cache list of NF/NF service configuration files, if the target EPC network element is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
In this embodiment, as shown in fig. 3, a NF in the 5G NFs initiates a service discovery request to an NRF, where the request carries a target EPC network element name, a target EPC network element type, and the like. The NRF retrieves a cached list of NF/NF service profiles to determine whether the 5G NFs are allowed to discover the target EPC. The target EPC can only be found by the NF in the same network slice. If the target EPC is deployed in a network slice, the NRF grants the discovery request according to the discovery configuration (e.g., network configuration) of that network slice.
Preferably, when the NRF receives the NF initiation service discovery request and/or subscription request, the request response message returned in S40 includes EPC network element names, and the profile of the EPC network elements, where the profile of each EPC network element includes the necessary parameters output to the NF.
In this embodiment, the NRF returns a request response message to the requesting 5G NFs, retrieves a set of EPC network elements that determine that the internal policy matches, and sends a profile of the determined EPC network elements.
Preferably, the necessary parameters output to the NF include a type of the target EPC network element, an address of the target EPC network element, a service list of the target EPC network element, a status of the target EPC network element, a PLMN ID, a tracking area identifier, a unique identifier of the EPC network element, and an S-nsais of the EPC network element.
In this embodiment, the determined profile of the EPC network element contains the necessary parameters for outputting to the 5G NFs, as shown in table two:
| attribute name | Description of the invention |
| target-Type | Type of target EPC network element |
| target-Address | Address of target EPC network element |
| target-Services | Target EPC network element service list |
| target-Status | Status of target EPC network element |
| Plmn ID | PLMN ID |
| TAls | Tracking area identification |
| Instanceld | Unique identification of EPC network element |
| sNssais | Of EPC network elementsS-NSSAIS |
And the 5G NFs performs NF instance selection to select a proper EPC network element according to the information parameters returned by the NRF.
Preferably, said S20 is followed by:
the S50NRF provides discovery service for EPC or NF and returns a registration reply message.
Preferably, when the 4G network is started, the EPC sends a registration request message to the NRF; when the 5G network starts, the NF sends a registration request message to the NRF.
The invention also discloses an NRF device used in the 4G/5G converged networking, which comprises an NRF body used for network storage and NF management, and a conversion module used for converting the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writing the NF configuration parameters into a cache list of the NF/NF service configuration file.
The invention realizes the multi-network element management of NRF to 4G core network elements and 5G NFs by adding a conversion module in an NRF device of a 5G core network, wherein the conversion module is used for converting and storing parameters of the 4G network elements.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A network element discovery method of 4G/5G fusion networking is characterized by comprising the following steps:
s10 EPC sends registration request message to NRF, which includes configuration parameter of EPC; the NF sends a registration request message to the NRF, wherein the registration request message comprises NF configuration parameters;
the conversion module of the S20 NRF converts the configuration parameters of the EPC into corresponding NF configuration parameters according to the parameter attributes and writes the NF configuration parameters into a cache list of the NF/NF service configuration file; NRF writes NF configuration parameters in the NF registration request message into a cache list of the NF/NF service configuration file;
s30 NRF receives network element service discovery request and/or subscription request, retrieves the cache list of NF/NF service configuration file, and retrieves whether the target network element is deployed in a certain network slice to determine whether to authorize service discovery;
s40, if determining that the authorized service is found, the NRF returns a request response message to perform target network element instance selection according to the request response message.
2. The method for discovering network element of 4G/5G converged networking according to claim 1, wherein if NRF receives service discovery request and/or subscription request initiated by EPC, the method of S30 comprises:
s301, the EPC initiates a service discovery request and/or a subscription request to the NRF, wherein the request comprises a target NF service name and the type of a target NF instance;
s302, the NRF retrieves a cache list of the NF/NF service configuration file, if a target NF instance or NF service instance is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
3. The method as claimed in claim 2, wherein when NRF receives service discovery request and/or subscription request initiated by EPC, the request response message returned in S40 includes target NF instance of discovery request and/or subscription request and NF profile of target NF instance, and each NF profile includes necessary parameters output to EPC.
4. The method of claim 3, wherein the necessary parameters output to the EPC include a type of the target NF, an address of the target NF instance, a service list of the target NF instance, a state of the target NF instance, a PLMN ID, a tracking area identifier, a unique identifier of the NF instance, and an S-NSSAIS of the NF instance.
5. The method for discovering network element of 4G/5G converged networking according to claim 1, wherein if NRF receives NF initiated service discovery request and/or subscription request, the method of S30 comprises:
s303 NRF receives a service discovery request and/or a subscription request initiated by NF, wherein the request comprises a target EPC network element name and a target EPC network element type;
s304 NRF retrieves the cache list of NF/NF service configuration files, if the target EPC network element is retrieved to be deployed in a certain network slice, the NRF determines to authorize a discovery request and/or a subscription request according to the discovery configuration of the network slice.
6. The method as claimed in claim 5, wherein when the NRF receives a service discovery request and/or a subscription request initiated by the NF, the request response message returned in S40 includes EPC network element names and configuration files of EPC network elements, and the configuration file of each EPC network element includes the necessary parameters output to the NF.
7. The method of claim 6, wherein the required parameters output to the NF include a type of the target EPC network element, an address of the target EPC network element, a service list of the target EPC network element, a status of the target EPC network element, a PLMN ID, a tracking area identifier, a unique identifier of the EPC network element, and an S-nsais of the EPC network element.
8. The method for discovering network element of 4G/5G converged networking according to claim 1, wherein after S20 further comprises:
s50NRF provides discovery service for EPC or NF and returns registration reply message.
9. The method for discovering network element of 4G/5G converged networking according to claim 1, wherein when the 4G network is started, the EPC sends a registration request message to NRF; when the 5G network starts, the NF sends a registration request message to the NRF.
10. An NRF device used in 4G/5G fusion networking comprises an NRF body used for network storage and NF management, and is characterized by also comprising a conversion module used for converting the configuration parameters of EPC into corresponding NF configuration parameters according to parameter attributes and writing the NF configuration parameters into a cache list of NF/NF service configuration files; the NRF device for use in 4G/5G converged networking is configured to perform the network element discovery method of 4G/5G converged networking according to any one of claims 1 to 9.
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