CN111107666A - PDU session-based network element selection method, device and storage medium - Google Patents
PDU session-based network element selection method, device and storage medium Download PDFInfo
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Abstract
The invention discloses a PDU session-based network element selection method, equipment and a computer-readable storage medium.A network element selection method comprises the steps that when an AMF establishes a PDU session, a candidate SMF is inquired from an NRF on the basis of a first filtering condition; when a plurality of candidate SMFs are obtained through query, the candidate SMFs are ranked according to the priority; sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session; and if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session.
Description
Technical Field
The present invention relates to 5G communication technologies, and in particular, to a method and an apparatus for selecting a network element based on a Protocol Data Unit (PDU) session, and a computer-readable storage medium.
Background
In the PDU Session creation process defined by the 3GPP 5G standard, the processing of the 5G core network part involves multiple network element selection operations, that is, an Access and Mobility Management Function (AMF) network element selects a Session Management Function (SMF) network element for the Session service, and then the selected SMF network element selects a User Plane Function (UPF) network element for the Session service. The selection mechanism of each network element is relatively isolated, and the AMF network element does not evaluate the capability and the state of each type of network element participating in the subsequent process, so that the success rate of PDU session creation is influenced.
Disclosure of Invention
In order to overcome the problems of a network element selection mechanism in the PDU session creation process in the prior art, the embodiment of the invention creatively provides a method, equipment and a computer readable storage medium for selecting a network element of a PDU session.
According to a first aspect of the present invention, a network element selection method based on PDU session is provided, where the method is applied to AMF, and includes: querying a Network Repository Function (NRF) for candidate SMFs based on a first filter condition when creating a PDU session; when a plurality of candidate SMFs are obtained through query, the candidate SMFs are ranked according to the priority; sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session; and if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session.
According to an embodiment of the invention, the method further comprises: and when a candidate SMF is obtained through inquiry, directly taking the candidate SMF as a target SMF for establishing the PDU session.
According to an embodiment of the present invention, the detecting whether the current candidate SMF satisfies a preset condition for establishing a PDU session includes: inquiring characteristic parameters and state information of UPF associated with the current candidate SMF from the NRF to obtain an inquiry result; detecting whether the current candidate SMF is associated with a candidate UPF which meets a second filtering condition and is in a normal state or not according to the query result; correspondingly, if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session, including: and if the current candidate SMF is associated with the candidate UPF which meets the second filtering condition and is in the normal state, taking the current candidate SMF as the target SMF for establishing the PDU session.
According to an embodiment of the invention, the method further comprises: and if the UPF which cannot directly access the NRF exists, the SMF related to the UPF updates the characteristic parameters and the state information of the UPF into the NRF.
According to an embodiment of the present invention, the sorting the plurality of candidate SMFs according to priority includes: the plurality of candidate SMFs are ranked according to the SMF priority evaluation parameters.
According to the second aspect of the present invention, there is also provided a PDU session based network element selecting device, where the device is applied to an AMF, and the device includes: the query module is used for querying candidate SMFs from the NRFs based on first filtering conditions in the PDU session creation process; the sorting module is used for sorting the candidate SMFs according to the priority when the candidate SMFs are obtained through query; the detection module is used for sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session; and the determining module is used for taking the current candidate SMF as a target SMF for establishing the PDU session if the current candidate SMF meets the preset condition for establishing the PDU session.
According to an embodiment of the present invention, the determining module is further configured to directly use the candidate SMF as a target SMF for establishing a PDU session when the querying module queries to obtain the candidate SMF.
According to an embodiment of the present invention, the detection module is specifically configured to query, from an NRF, a characteristic parameter and state information of a UPF associated with a current candidate SMF to obtain a query result; detecting whether the current candidate SMF is associated with a candidate UPF which meets a second filtering condition and is in a normal state or not according to the query result; correspondingly, the determining module is specifically configured to, if the current candidate SMF is associated with the candidate UPF that satisfies the second filtering condition and is in the normal state, use the current candidate SMF as a target SMF for establishing the PDU session.
According to an embodiment of the present invention, the sorting module is specifically configured to sort the plurality of candidate SMFs according to a priority evaluation parameter of the SMFs.
According to a third aspect of the present invention, there is provided a computer-readable storage medium, which comprises a set of computer-executable instructions, and when executed, is configured to perform any one of the above described PDU session based network element selection methods.
In the method, the device and the computer-readable storage medium for selecting the network element based on the PDU session, when the AMF establishes the PDU session, the AMF firstly queries a candidate SMF from an NRF based on a first filtering condition; when a plurality of candidate SMFs are obtained through query, the candidate SMFs are ranked according to the priority; sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session; and if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session. Therefore, when the PDU session is established, the AMF selects the optimal SMF to establish the PDU session by evaluating the capability and the state of the network elements including the SMF participating in the subsequent process, thereby greatly improving the success rate of the establishment of the PDU session.
It is to be understood that the teachings of the present invention need not achieve all of the above-described benefits, but rather that specific embodiments may achieve specific technical results, and that other embodiments of the present invention may achieve benefits not mentioned above.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Fig. 1 is a schematic diagram illustrating a first implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a second implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a third implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a component structure of a PDU session-based network element selection device according to an embodiment of the present invention.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given only to enable those skilled in the art to better understand and to implement the present invention, and do not limit the scope of the present invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Fig. 1 is a schematic diagram illustrating a first implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention.
Referring to fig. 1, the PDU session based network element selection method of the present invention, applied to the AMF, includes: in operation 101, when creating a PDU session, a candidate SMF is queried from an NRF based on a first filtering condition; operation 102, when a plurality of candidate SMFs are obtained through query, sorting the plurality of candidate SMFs according to priority; operation 103, sequentially traversing the plurality of candidate SMFs according to the order of the priorities from high to low, and detecting whether the current candidate SMF meets a preset condition for establishing a PDU session; in operation 104, if the current candidate SMF meets the preset condition for establishing the PDU session, the current candidate SMF is used as the target SMF for establishing the PDU session.
In order to improve the success rate of creating the PDU session when the AMF network element creates the PDU session, the AMF network element comprehensively evaluates the characteristic parameters and the state information of the candidate SMFs, UPFs related to the SMFs and other network elements through operations 101-104, and selects the best SMF according to the priority of comprehensive evaluation so as to establish the PDU session.
In operation 101, the AMF queries for a candidate SMF satisfying a first filtering condition based on the first filtering condition, i.e., information such as single network slice selection assistance information (S-NSSAI) and Data Network Name (DNN), with reference to a definition of a standard interface (nrrf _ NFDiscovery) provided by the NRF, according to a mechanism defined by a 5GC standard.
In operations 102-103, when the query result indicates that a plurality of candidate SMFs satisfying the first filtering condition exist, that is, the plurality of candidate SMFs are obtained by the query, the plurality of candidate SMFs are ranked according to priority; further, the AMF sequentially traverses a plurality of candidate SMFs according to the sequence of the SMFs from high priority to low priority, and detects whether the current candidate SMF meets the preset condition for establishing the PDU session.
Here, the sorting the plurality of candidate SMFs according to priority specifically includes: and evaluating parameters such as a capacity index and a load index according to the priority of the SMF, and sorting the parameters from high to low.
In operation 104, in order to improve efficiency, if it can be predicted that the current candidate SMF satisfies the preset condition for establishing the PDU session, that is, it is determined that the current candidate SMF can complete the subsequent session flow, the current candidate SMF is used as the target SMF for establishing the PDU session, and it is not necessary to continuously query the SMF with a lower priority than the current candidate SMF.
In the embodiment of the invention, when the PDU session is created, AMF firstly inquires a candidate SMF from a Network Repository Function (NRF) based on a first filtering condition; when a plurality of candidate SMFs are obtained through query, the candidate SMFs are ranked according to the priority; sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session; and if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session. Therefore, when the PDU session is established, the AMF selects the optimal SMF to establish the PDU session by evaluating the capability and the state of the network elements including the SMF participating in the subsequent process, thereby greatly improving the success rate of the establishment of the PDU session.
Fig. 2 is a schematic diagram illustrating a first implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention.
Referring to fig. 2, the PDU session based network element selection method of the present invention, applied to the AMF, includes: in operation 201, when creating a PDU session, a candidate SMF is queried from an NRF based on a first filter condition; in operation 202, when a candidate SMF is obtained by the query, the candidate SMF is directly used as a target SMF for establishing the PDU session.
In operation 201, the AMF queries for a candidate SMF satisfying a first filtering condition based on the first filtering condition, i.e., information such as single network slice selection assistance information (S-NSSAI) and Data Network Name (DNN), with reference to a definition of a standard interface (nrrf _ NFDiscovery) provided by the NRF, according to a mechanism defined by a 5GC standard.
In operation 202, when the query result indicates that there is a candidate SMF satisfying the first filtering condition, that is, a candidate SMF is obtained by the query, the candidate SMF is directly used as a target SMF for establishing the PDU session.
In this way, the SMF is predicted through the first filtering condition, so that the SMF meeting the filtering condition is selected to establish the PDU session, and the success rate of PDU session establishment is improved to a certain extent.
Fig. 3 is a schematic diagram illustrating a first implementation flow of a PDU session-based network element selection method according to an embodiment of the present invention.
Referring to fig. 3, the PDU session based network element selection method of the present invention, applied to the AMF, includes: in operation 301, when creating a PDU session, a candidate SMF is queried from the NRF based on a first filtering condition; operation 302, when a plurality of candidate SMFs are obtained by the query, the plurality of candidate SMFs are ranked according to priority; operation 303, sequentially traversing the plurality of candidate SMFs according to the order of the priorities from high to low, and querying the feature parameters and the state information of the UPF associated with the current candidate SMF from the NRF to obtain a query result; operation 304, detecting whether the current candidate SMF is associated with a candidate UPF that satisfies the second filtering condition and is in a normal state according to the query result; in operation 305, if the current candidate SMF is associated with a candidate UPF that satisfies the second filtering condition and is in a normal state, the current candidate SMF is taken as a target SMF for establishing the PDU session.
The specific implementation process of operations 301 and 302 is similar to the specific implementation process of operations 101 and 102 in the embodiment shown in fig. 1, and is not described here again.
In operations 303 to 304, the AMF sequentially traverses the plurality of candidate SMFs according to the order of priority from high to low, and queries whether each SMF has a candidate UPF and status information of the UPF based on information (e.g., SMF-serving-area) related to N4 of each SMF in combination with a second filtering condition (e.g., information such as S-NSSAI and DNN, and reference to the definition of a standard interface provided by the NRF), so as to be able to predict whether each SMF network element can complete a subsequent process. Specifically, firstly, characteristic parameters and state information of UPF associated with the current candidate SMF are inquired from the NRF to obtain an inquiry result; and then detecting whether the current candidate SMF is associated with the candidate UPF which meets the second filtering condition and is in a normal state or not according to the query result.
Here, it should be noted that, if there is a UPF that cannot directly access the NRF, the SMF associated with the UPF updates the feature parameters and the status information of the UPF to the NRF, so that operations 303 to 304 are normally performed.
In operation 305, in order to improve efficiency, if it can be predicted that the current candidate SMF is associated with the candidate UPF which satisfies the second filtering condition and is in the normal state, that is, it is determined that the current candidate SMF can complete the subsequent session flow, the current candidate SMF is used as the target SMF for establishing the PDU session, and it is not necessary to continuously query the SMF with a lower priority than the current candidate SMF.
Thus, when the AMF network element creates the PDU session, in order to improve the success rate of creating the PDU session, through operations 301 to 305, the characteristic parameters and the state information of the candidate SMFs and the network elements such as the UPFs associated with the SMFs are comprehensively evaluated, and the best SMF is selected according to the priority of the comprehensive evaluation, so as to establish the PDU session.
Similarly, based on the PDU session based network element selecting method, an embodiment of the present invention further provides a computer-readable storage medium, where a program is stored, and when the program is executed by a processor, the processor is enabled to perform at least the following operation steps: an operation 101 of, when creating a PDU session, querying a candidate SMF from a Network Repository Function (NRF) based on a first filtering condition; operation 102, when a plurality of candidate SMFs are obtained through query, sorting the plurality of candidate SMFs according to priority; operation 103, sequentially traversing the plurality of candidate SMFs according to the order of the priorities from high to low, and detecting whether the current candidate SMF meets a preset condition for establishing a PDU session; in operation 104, if the current candidate SMF meets the preset condition for establishing the PDU session, the current candidate SMF is used as the target SMF for establishing the PDU session.
Further, based on the PDU session based network element selection method as described above, an embodiment of the present invention further provides a PDU session based network element selection device, as shown in fig. 4, where the device 40 is applied to an AMF, and includes: a query module 401, configured to query candidate SMFs from NRFs based on a first filtering condition in a PDU session creation process; a sorting module 402, configured to, when multiple candidate SMFs are obtained through query, sort the multiple candidate SMFs according to priority; a detecting module 403, configured to sequentially traverse the multiple candidate SMFs according to a sequence from high priority to low priority, and detect whether a current candidate SMF meets a preset condition for establishing a PDU session; a determining module 404, configured to, if the current candidate SMF meets a preset condition for establishing a PDU session, use the current candidate SMF as a target SMF for establishing the PDU session.
According to an embodiment of the present invention, the determining module 404 is further configured to directly use a candidate SMF as a target SMF for establishing a PDU session when the querying module queries to obtain the candidate SMF.
According to an embodiment of the present invention, the detecting module 403 is specifically configured to query, from the NRF, the characteristic parameters and state information of the UPF associated with the current candidate SMF, so as to obtain a query result; detecting whether the current candidate SMF is associated with a candidate UPF which meets a second filtering condition and is in a normal state or not according to the query result; correspondingly, the determining module 404 is specifically configured to, if the current candidate SMF is associated with the candidate UPF that meets the second filtering condition and is in the normal state, use the current candidate SMF as a target SMF for establishing the PDU session.
According to an embodiment of the present invention, the sorting module 402 is specifically configured to sort the plurality of candidate SMFs according to the priority evaluation parameter of the SMFs.
Here, it should be noted that: the above description of the embodiment of the network element selecting device based on the PDU session is similar to the description of the method embodiments shown in fig. 1 to 3, and has similar beneficial effects to the method embodiments shown in fig. 1 to 3, and therefore, no further description is given. For technical details that are not disclosed in the embodiment of the PDU session based network element selection device of the present invention, please refer to the description of the method embodiments shown in fig. 1 to 3 of the present invention for understanding, and therefore, for brevity, will not be described again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A network element selection method based on PDU session is characterized in that the method is applied to AMF, and the method comprises the following steps:
when creating a PDU session, querying candidate SMFs from NRFs based on a first filtering condition;
when a plurality of candidate SMFs are obtained through query, the candidate SMFs are ranked according to the priority;
sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session;
and if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session.
2. The method of claim 1, further comprising: and when a candidate SMF is obtained through inquiry, directly taking the candidate SMF as a target SMF for establishing the PDU session.
3. The method according to claim 1 or 2, wherein the detecting whether the current candidate SMF satisfies a preset condition for establishing the PDU session comprises:
inquiring characteristic parameters and state information of UPF associated with the current candidate SMF from the NRF to obtain an inquiry result;
detecting whether the current candidate SMF is associated with a candidate UPF which meets a second filtering condition and is in a normal state or not according to the query result;
correspondingly, if the current candidate SMF meets the preset condition for establishing the PDU session, taking the current candidate SMF as a target SMF for establishing the PDU session, including:
and if the current candidate SMF is associated with the candidate UPF which meets the second filtering condition and is in the normal state, taking the current candidate SMF as the target SMF for establishing the PDU session.
4. The method of claim 3, further comprising:
and if the UPF which cannot directly access the NRF exists, the SMF related to the UPF updates the characteristic parameters and the state information of the UPF into the NRF.
5. The method of claim 1 or 2, wherein said prioritizing the plurality of candidate SMFs comprises:
the plurality of candidate SMFs are ranked according to the SMF priority evaluation parameters.
6. A device for selecting a network element based on a PDU session, wherein the device is applied to an AMF, and the device comprises:
the query module is used for querying candidate SMFs from the NRFs based on first filtering conditions in the PDU session creation process;
the sorting module is used for sorting the candidate SMFs according to the priority when the candidate SMFs are obtained through query;
the detection module is used for sequentially traversing the plurality of candidate SMFs according to the sequence of the priorities from high to low, and detecting whether the current candidate SMF meets the preset condition for establishing the PDU session;
and the determining module is used for taking the current candidate SMF as a target SMF for establishing the PDU session if the current candidate SMF meets the preset condition for establishing the PDU session.
7. The apparatus of claim 6,
the determining module is further configured to directly use the candidate SMF as a target SMF for establishing a PDU session when the querying module queries to obtain the candidate SMF.
8. The apparatus according to claim 6 or 7,
the detection module is specifically used for inquiring the characteristic parameters and the state information of the UPF associated with the current candidate SMF from the NRF to obtain an inquiry result; detecting whether the current candidate SMF is associated with a candidate UPF which meets a second filtering condition and is in a normal state or not according to the query result;
correspondingly, the determining module is specifically configured to, if the current candidate SMF is associated with the candidate UPF that satisfies the second filtering condition and is in the normal state, use the current candidate SMF as a target SMF for establishing the PDU session.
9. The apparatus according to claim 6 or 7,
the sorting module is specifically configured to sort the plurality of candidate SMFs according to the SMF priority evaluation parameter.
10. A computer-readable storage medium comprising a set of computer-executable instructions that, when executed, perform the PDU session based network element selection method of any one of claims 1 to 5.
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