CN112512100B - Slice priority-based AMF (advanced metering framework) redirection method and newly-added management network element - Google Patents

Slice priority-based AMF (advanced metering framework) redirection method and newly-added management network element Download PDF

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CN112512100B
CN112512100B CN202011454554.0A CN202011454554A CN112512100B CN 112512100 B CN112512100 B CN 112512100B CN 202011454554 A CN202011454554 A CN 202011454554A CN 112512100 B CN112512100 B CN 112512100B
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amf
terminal
network element
management network
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CN112512100A (en
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王鑫
田新雪
肖征荣
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China United Network Communications Group Co Ltd
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China United Network Communications Group Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The present disclosure provides an AMF redirection method based on slice priority, a newly added management network element, a computer device and a storage medium, the method comprising: when the terminal is migrated from the first base station to the second base station, the newly added management network element acquires a first AMF selectable set distributed to the terminal by a core network at a network side; acquiring a second AMF optional set at the terminal side, wherein the second AMF optional set comprises a plurality of AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the plurality of AMFs are sorted according to the comprehensive priority groups of the S-NSSAIs respectively corresponding to the AMFs; acquiring the performance of each AMF in the first AMF optional set and the second AMF optional set; and selecting one AMF as a target AMF for redirection according to the first AMF optional set and the second AMF optional set and the performance of each AMF. According to the technical scheme, the optimal AMF can be selected as the redirected AMF, and the slicing quality is guaranteed.

Description

Slice priority-based AMF (advanced metering framework) redirection method and newly-added management network element
Technical Field
The present disclosure belongs to the field of communications technologies, and in particular, to an AMF redirection method based on slice priority, a newly added management network element, a computer device, and a computer-readable storage medium.
Background
The 5G terminal may Access multiple Network slices simultaneously, and when registering a Slice service, an NSSF (Network Slice Selection Function) entity may select a suitable AMF (Access and Mobility Management Function) (or an optional AMF set) for Mobility Management according to a terminal Slice request NSSAI (Network Slice Selection Assistance Information) (S-NSSAI (single Network Slice Selection Assistance Information) set). If the terminal position changes obviously, the terminal jumps from the old gNB (5G base station) to the new gNB, the core network side also initiates an AMF redirection request, and the NSSF needs to match the new AMF (optional AMF set) for the terminal again to meet the slicing service. However, in the process of AMF redirection at a new geographic location, the AMF set for satisfying the load balancing condition may not satisfy multiple slice services required by the terminal at the same time. In the prior art, a newly switched gNB selects an AMF for a terminal to access a core network, and is based on an optional AMF set pointer (the core network is distributed in an old gNB and an old TA (Tracking Area)) Area carried by the terminal, if a signaling does not carry the AMF set pointer, a network side matches a proper AMF for the terminal according to a user subscription rule and the load degree of the AMF; however, the optional AMF set pointer allocated on the network side or carried by the terminal is not the optimal scheme scheduled according to the actual scene or the user requirement, and if the AMF is relocated to a target AMF with a farther routing path or is redirected to an overloaded AMF to ensure that the terminal slice can be completely accessed, the experience of the Ultra-relay and Low Latency Communication (Ultra-reliable and Low Latency Communication) service is poor, and the actual service requirement of the user is difficult to meet.
Disclosure of Invention
The present disclosure provides an AMF redirection method based on slice priority, a newly added management network element, a computer device, and a computer readable storage medium, which can select an optimal AMF as a redirection target AMF, thereby implementing matching between network capability and user requirements, and guaranteeing Quality of Service (Quality of Service) of a slice.
In a first aspect, an embodiment of the present disclosure provides an AMF redirection method based on slice priority, including:
when the terminal is migrated from the first base station to the second base station, the newly added management network element acquires a first AMF selectable set distributed to the terminal by a core network at a network side;
a newly-added management network element acquires a second AMF optional set at a terminal side, wherein the second AMF optional set comprises a plurality of AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the AMFs are sorted according to the comprehensive priority groups of the S-NSSAIs respectively corresponding to the AMFs;
the newly-added management network element acquires the performance of each AMF in the first AMF optional set and the second AMF optional set; and the number of the first and second groups,
and the newly-added management network element selects one AMF as a redirected target AMF according to the first AMF optional set and the second AMF optional set and the performance of each AMF.
Further, the acquiring, by the newly added management network element, the first AMF option set allocated by the core network to the terminal at the network side includes:
the newly added management network element receives a first AMF selectable set sent by an initial AMF;
the first AMF selectable set is sent to an initial AMF by a network slice selection function NSSF entity after the initial AMF sends a slice selection message to the NSSF entity according to the basic information of the terminal; and the basic information of the terminal is sent to the initial AMF after the second base station establishes Radio Resource Control (RRC) connection with the terminal and acquires the basic information of the terminal.
Further, the acquiring, by the newly added management network element, the second AMF alternative at the terminal side includes:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected from the first base station, a URSP (UE Route Selection Policy) rule corresponding to each S-NSSAI, and a Session and Service Continuity MODE (SSC-MODE) corresponding to each S-NSSAI;
the newly increased management network element sends a session service sequencing level confirmation message to the terminal so that the terminal returns the sequencing level of each session service selected by a user or preset by the terminal to the newly increased management network element;
the newly increased management network element confirms the S-NSSAI corresponding to each session service respectively;
the newly-added management network element acquires the preset priority of SSC MODE corresponding to each network slice; and the number of the first and second groups,
and the newly-added management network element performs comprehensive priority evaluation on each S-NSSAI corresponding to each AMF in a third AMF selectable set currently connected with the terminal according to the sorting level of each session service and the priority of the SSC MODE corresponding to each network slice, sorts each AMF according to the comprehensive priority group of each S-NSSAI corresponding to each AMF, and forms a second AMF selectable set based on each AMF after the grouping sorting.
Further, the step of confirming, by the newly added management network element, the S-NSSAI corresponding to each session service respectively includes:
the newly-added management network element acquires APP-ID and OS-ID (Operating system ID) according to the identifier of the traffic descriptor corresponding to each network slice in the URSP rule corresponding to each S-NSSAI, wherein the APP-ID and the OS-ID are default identifiers of the traffic descriptor in the URSP rule set by the terminal side; and the number of the first and second groups,
and obtaining the session service name corresponding to each S-NSSAI according to the APP-ID and the OS-ID, and confirming the S-NSSAI corresponding to each session service respectively according to the session service name corresponding to each S-NSSAI.
Further, the acquiring, by the newly added management network element, the second AMF alternative at the terminal side includes:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected with the first base station, a URSP rule corresponding to each S-NSSAI, and an SSC-MODE corresponding to each S-NSSAI;
the newly-added management network element collects data corresponding to each S-NSSAI to perform artificial intelligence neural network machine training, and obtains the comprehensive priority of each S-NSSAI under different scenes, wherein the data corresponding to each S-NSSAI comprises the safety isolation of a network slice, the communication reliability of the network slice, a service occurrence period, a service concurrency condition and a user use terminal scene; and the number of the first and second groups,
and the newly added management network element acquires the comprehensive priority of each S-NSSAI in the current use scene of the terminal, performs grouping ordering on each AMF in a third AMF optional set which is currently connected with the terminal according to the comprehensive priority of each S-NSSAI respectively corresponding to each AMF, and forms a second AMF optional set based on each AMF subjected to grouping ordering.
Further, the acquiring, by the newly added management network element, the performance of each AMF in the first AMF optional set and the second AMF optional set includes:
the newly-added management network element requests the current AMF load rate of each AMF in the first AMF selectable set and the second AMF selectable set, and receives the AMF load rate returned by each AMF; and the number of the first and second groups,
and the newly-added management network element requests the second base station to acquire each average time delay for establishing connection with each AMF in the first AMF optional set and the second AMF optional set, receives each average time delay for establishing connection with each AMF sent by the second base station, and determines the average time delay as the average time delay of each AMF.
Further, the selecting, by the newly-added management network element, one AMF from the first AMF option set and the second AMF option set as a target AMF for redirection according to the performance of each AMF includes:
the newly-added management network element determines whether the first AMF optional set and the second AMF optional set have a common AMF or not;
if the shared AMF exists, selecting AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity in the second AMF optional set from the shared AMF, and selecting AMFs with load rates and average time delays meeting preset requirements from the AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity as target AMFs;
and if the common AMF does not exist, selecting the AMF with the load rate and the average time delay meeting the preset requirements from the first AMF selectable set as the target AMF.
In a second aspect, an embodiment of the present disclosure provides a new management network element, including:
the first acquisition module is configured to acquire a first AMF selectable set allocated to the terminal by a core network at a network side when the terminal migrates from a first base station to a second base station;
a second obtaining module, configured to obtain a second AMF selectable set on the terminal side, where the second AMF selectable set includes multiple AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the multiple AMFs are sorted according to their respective corresponding comprehensive priority groups of each S-NSSAI;
a third obtaining module configured to obtain performance of each AMF in the first and second AMF alternative sets; and the number of the first and second groups,
and the selecting module is configured to select one AMF from the first AMF selectable set and the second AMF selectable set as a redirected target AMF according to the performance of each AMF in the first AMF selectable set and the second AMF selectable set.
In a third aspect, an embodiment of the present disclosure further provides a computer device, including a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the slice priority based AMF redirection method according to any one of the first aspect.
In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, including: computer program which, when run on a computer, causes the computer to perform the slice priority based AMF redirection method as described in any one of the first aspects.
Has the advantages that:
according to the AMF redirection method based on the slice priority, the newly-added management network element, the computer equipment and the computer readable storage medium, the first AMF optional set which is distributed by the NSFF based on the terminal information and the network capability is obtained at the network side, the second AMF optional set which meets the slice priority of the user intention and the conversation continuity requirement is obtained at the terminal side, then the slice priority of the user, the AMF load rate, the base station, the AMF return delay and other multiple factors are integrated, the optimal AMF is selected as the redirected target AMF, further the matching of the network capability and the user requirement is realized, and the slice Qos is guaranteed.
Drawings
Fig. 1 is a schematic flowchart of an AMF redirection method based on slice priority according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of an AMF redirection method based on slice priority according to a second embodiment of the present disclosure;
fig. 3 is an architecture diagram of a newly added management network element according to a third embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present disclosure better understood, the present disclosure is further described in detail below with reference to the accompanying drawings and examples.
In which the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
When a terminal changes a connected gNB, an AMF is selected for the terminal through the newly switched gNB to access a core network, a target AMF is selected based on an optional AMF set pointer (distributed in an old gNB and an old TA area) carried by the terminal, and if a signaling does not carry the AMF pointer, a network side can match a proper AMF for the terminal according to a user subscription rule and the load degree of the AMF; however, the optional AMF set pointer allocated by the network side or carried by the terminal is not the optimal scheme scheduled according to the actual scene or user requirements, so the user experience is poor.
The following describes the technical solutions of the present disclosure and how to solve the above technical problems in specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic flowchart of an AMF redirection method based on slice priority according to an embodiment of the present disclosure, as shown in fig. 1, the method includes:
step S101: when the terminal is migrated from the first base station to the second base station, the newly added management network element acquires a first AMF selectable set distributed to the terminal by a core network at a network side;
step S102: a newly-added management network element acquires a second AMF optional set at a terminal side, wherein the second AMF optional set comprises a plurality of AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the AMFs are sorted according to the comprehensive priority groups of the S-NSSAIs respectively corresponding to the AMFs;
step S103: the newly-added management network element acquires the performance of each AMF in the first AMF optional set and the second AMF optional set; and the number of the first and second groups,
step S104: and the newly-added management network element selects one AMF as a redirected target AMF according to the first AMF optional set and the second AMF optional set and the performance of each AMF.
When the geographic location of the terminal changes, the terminal migrates from a first base station (e.g., a gNB1) to a second base station (e.g., a gNB2), and reselects an AMF to access a core network. The newly added management network element is a server and has the functions of communication, storage and calculation. The newly-added management network element respectively receives a first AMF optional set which is distributed by a network side and accords with the slicing capability of the terminal, and collects a second AMF optional set which is provided by the terminal side and is subjected to sequencing; the order of which is in accordance with the user's intent for slice priority and session continuity requirements. And then selecting one AMF as a redirected target AMF according to the first AMF selectable set, the second AMF selectable set and the performance of each AMF, wherein the target AMF must be in the first AMF selectable set.
Further, in step S101, the acquiring, by the newly added management network element, the first AMF option set allocated by the core network to the terminal at the network side includes:
the newly added management network element receives a first AMF selectable set sent by an initial AMF;
the first AMF selectable set is sent to an initial AMF by a network slice selection function NSSF entity after the initial AMF sends a slice selection message to the NSSF entity according to the basic information of the terminal; and the basic information of the terminal is sent to the initial AMF after the second base station establishes Radio Resource Control (RRC) connection with the terminal and acquires the basic information of the terminal.
The specific process of allocating the first AMF alternative to the terminal by the core network includes:
when the UE migrates to the gNB2, the gNB2 establishes an RRC (Radio Resource Control) connection for the terminal, and the UE (User Equipment) completes registration on an RRC connection layer: sending an RRC Setup Complete message at a corresponding time-frequency resource location using a MCS (session Critical Service, key Data Service) configured by a gNB, where the RRC Setup Complete message mainly includes terminal basic information (e.g., registration type, 5G-GUTI (global uniform temporal UE Identity, Globally Unique Temporary UE Identity), last TA, required slice Identity NSSAI, terminal capability, PDU (Protocol Data Unit) session list, and the like);
the gNB2 sends Registration request message (including the terminal basic information in the RRC Setup Complete message) to the initial AMF, which is the one that the terminal previously directed.
Sending by the initial AMF to the NSSF slice selection message: (the needed slice id NSSAI, the needed NSSAI routing information, the current TA, the alternative slice NSSAI, the PLMN (Public Land Mobile Network) of the terminal, etc.); the NSSF feeds back NSSF _ NSSelection _ Get response information (address and routing information of an optional AMF set, [ NSI ID(s) ] (identifier of Network Slice instance), [ nrf(s) ], (NF redundancy Function, Network registration Function), unusable NSSAI, and the like) to the initial AMF.
And the initial AMF sends the optional AMF set fed back by the NSSF to the newly-added management network element. To this end, the newly added management network element receives an AMF alternative which is distributed by the network side and meets the slicing capability of the terminal, which is called a first AMF alternative, and includes: AMF20, AMF19, AMF77, and the like.
Further, the acquiring, by the newly added management network element, the second AMF alternative at the terminal side includes:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected with the first base station, a URSP rule corresponding to each S-NSSAI, and a session and service continuous MODE SSC-MODE corresponding to each S-NSSAI;
the newly increased management network element sends a session service sequencing level confirmation message to the terminal so that the terminal returns the sequencing level of each session service selected by a user or preset by the terminal to the newly increased management network element;
the newly increased management network element confirms the S-NSSAI corresponding to each session service respectively;
the newly-added management network element acquires the preset priority of SSC MODE corresponding to each network slice; and the number of the first and second groups,
and the newly-added management network element performs comprehensive priority evaluation on each S-NSSAI corresponding to each AMF in a third AMF selectable set currently connected with the terminal according to the sorting level of each session service and the priority of the SSC MODE corresponding to each network slice, sorts each AMF according to the comprehensive priority group of each S-NSSAI corresponding to each AMF, and forms a second AMF selectable set based on each AMF after the grouping sorting.
Before the base station migration is carried out, the terminal records a third AMF optional set of the currently connected S-NSSAI (the set is the AMF allocated in the gNB1 connection state, and therefore may be different from the first AMF optional set).
Before the terminal is disconnected from a certain gNB, a plurality of S-NSSAIs (such as S-NSSAI1, S-NSSAI2 and S-NSSAI3) which are currently connected, URSP rules corresponding to each S-NSSAI and session MODEs SSC-MODE corresponding to each S-NSSAI are sent to a newly-added management network element, and the newly-added management network element sends a session service sequencing level confirmation message to the terminal so that the terminal returns the sequencing level of each session service selected by a user or preset by the terminal to the newly-added management network element; for example, the ranking level is telephone, navigation, video, internet, game, etc. in turn, or applications guaranteed to be used according to the preference of the applications, such as a high-end map, WeChat, QQ, various games APP, etc.; then confirming the S-NSSAI corresponding to each session service; obtaining a ranking factor for S-NSSAI on user intent selection; the newly added management network element performs factor setting of the S-NSSAI according to the session service ranking level, for example, the ranking factor of the first ranking level is a1, the second ranking level is a2, and the third ranking level is a 3; the three relations are a1> a2> a3 … …;
the newly-added management network element receives a session SSC MODE corresponding to each slice set in advance; the advance setting can be set in the newly-added management network element or in the terminal, and the terminal sends the information to the newly-added management network element; for example: if it is SSC MODE1 that represents the session type of the slice is that the network is to remain connected to the terminal, and therefore the priority level of the session traffic is high, the weight level factor is set to b 1; if the SSC MODE3 indicates that the session service may be released during the connection process, the weight level factor is b 2; if the SSC MODE2 indicates that the session service may be released during the connection, but a new connection is established before the old connection is released, the weight level factor is b 3; the relation of b1> b3> b2 … …;
and the newly-added management network element performs comprehensive priority evaluation on a plurality of slices connected with the current terminal according to a1-a3 and b1-b 3. The comprehensive priority rating may be based on the respective weights of the corresponding user intention and the session continuity, for example, the user intention weight is 0.6, the session continuity is 0.4, or both are 0.5; can be set according to actual conditions; after the comprehensive priority rating is completed, for example, the comprehensive priority rating is S-NSSAI1, S-NSSAI2 and S-NSSAI3 in sequence from high to low; then, a second AMF alternative set is formed according to the alternative AMFs stored in each S-NSSAI, for example, the alternative AMFs corresponding to S-NSSAI1 include AMF18, AMF19, AMF62 and AMF 103; optional AMFs corresponding to S-NSSAI2 include AMF18, AMF22, AMF15, AMF 19; optional AMFs corresponding to S-NSSAI3 include AMF18, AMF19, AMF12, AMF 20; the second AMF alternative set has packet ordering as: [ (AMF18, AMF19, AMF62, AMF103), (AMF22, AMF15), (AMF12, AMF20) ], and AMFs corresponding to the same S-NSSAI have the same priority.
Further, the step of confirming, by the newly added management network element, the S-NSSAI corresponding to each session service respectively includes:
the newly-added management network element acquires APP-ID and OS-ID according to the identifier of the traffic descriptor corresponding to each network slice in the URSP rule corresponding to each S-NSSAI, wherein the APP-ID and the OS-ID are default identifiers of the traffic descriptor in the URSP rule set by the terminal side; and the number of the first and second groups,
and obtaining the session service name corresponding to each S-NSSAI according to the APP-ID and the OS-ID, and confirming the S-NSSAI corresponding to each session service respectively according to the session service name corresponding to each S-NSSAI.
The flow descriptor of the URSP at the terminal side is identified by APP-ID + OS-ID by default, and IP \ DNN \ FQDN is not selected as the identifier. The APP-ID is an application name, and the OS-ID is a system name;
the newly added management network element obtains APP-ID + OS-ID from the flow descriptor identifier corresponding to each slice in the URSP rule, and obtains the specific application program name of the currently used slice through the APP-ID; in another implementation manner of this embodiment, the ranking level of each session service may also be selected or preset by the user by displaying the ranking level selection of each session service to the user of the current application and the visual interface of the session service.
Further, the acquiring, by the newly added management network element, the second AMF alternative at the terminal side includes:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected with the first base station, a URSP rule corresponding to each S-NSSAI, and an SSC-MODE corresponding to each S-NSSAI;
the newly-added management network element collects data corresponding to each S-NSSAI to perform artificial intelligence neural network machine training, and obtains the comprehensive priority of each S-NSSAI under different scenes, wherein the data corresponding to each S-NSSAI comprises the safety isolation of a network slice, the communication reliability of the network slice, a service occurrence period, a service concurrency condition and a user terminal using scene; and the number of the first and second groups,
and the newly added management network element acquires the comprehensive priority of each S-NSSAI in the current use scene of the terminal, performs grouping ordering on each AMF in a third AMF optional set which is currently connected with the terminal according to the comprehensive priority of each S-NSSAI respectively corresponding to each AMF, and forms a second AMF optional set based on each AMF subjected to grouping ordering.
In performing the overall prioritization of the individual S-NSSAIs, the following types of data may also be collected for analyzing user usage behavior, for example: the method comprises the steps of carrying out artificial intelligence neural network machine training on safety isolation of slices, communication reliability of the slices, service occurrence time intervals, service concurrency conditions and user use terminal scenes to obtain comprehensive priority of each slice service of a user in a scene 1, a scene 2 and a scene 3 when a plurality of slices are operated concurrently. Therefore, the newly added management network element pre-judges the comprehensive priority of each S-NSSAI according to the current time, the position of the terminal and the scene of the terminal currently used by the user.
Further, the acquiring, by the newly added management network element, the performance of each AMF in the first AMF optional set and the second AMF optional set includes:
the newly-added management network element requests the current AMF load rate of each AMF in the first AMF selectable set and the second AMF selectable set, and receives the AMF load rate returned by each AMF; and the number of the first and second groups,
and the newly-added management network element requests the second base station to acquire each average time delay for establishing connection with each AMF in the first AMF optional set and the second AMF optional set, receives each average time delay for establishing connection with each AMF sent by the second base station, and determines the average time delay as the average time delay of each AMF.
In this embodiment, the gNB in the network needs to record the average delay of establishing the connection with the AMF to which it has been connected, for example, the delay can be obtained by the gNB through the round-trip message timestamp when establishing with the AMF. The management module requests the gNB2, and the gNB2 connects the average rate of each AMF in the first AMF optional set and the second AMF optional set to obtain the average time delay of each AMF; such as time delay t1 of AMF18, time delay t2 of AMF19, time delay t3 … … of AMF 62.
Further, the selecting, by the newly-added management network element, one AMF from the first AMF option set and the second AMF option set as a target AMF for redirection according to the performance of each AMF includes:
the newly-added management network element determines whether the first AMF optional set and the second AMF optional set have a common AMF or not;
if the shared AMF exists, selecting AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity in the second AMF optional set from the shared AMF, and selecting AMFs with load rates and average time delays meeting preset requirements from the AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity as target AMFs;
and if the common AMF does not exist, selecting the AMF with the load rate and the average time delay meeting the preset requirements from the first AMF selectable set as the target AMF.
First the target AMF serves as many slices as possible, i.e. the newly added management network element looks for several AMFs in common in the first and second AMF alternative.
On the basis of the previous step, preferentially selecting the AMF corresponding to the S-NSSAI with high comprehensive priority in the second AMF selectable set; and judging the load rate and the average time delay of the AMF or the AMFs, and selecting the AMF with the load rate and the average time delay meeting the preset requirements as a target AMF. The preset requirements of the load rate and the average time delay can be set independently, for example, the load is lower than 20% and the time delay is lower than 5 ms; randomly selecting one AMF from the AMFs, or scoring the AMFs according to the respective weights of the load rate and the average time delay, wherein the weights of the load rate and the average time delay can be respectively 0.7 and 0.3, or 0.5 and 0.5; setting according to actual conditions.
And if the AMF common to the first AMF optional set and the second AMF optional set is not found, preferentially ensuring the AMF in the first AMF optional set, judging the load rate and the average delay of the gNB2 of the AMF or the AMFs in the first AMF optional set, selecting the AMF with the highest score as the target AMF, wherein the load rate and the average delay meet the preset requirements.
The newly added management network element informs the selected target AMF to the gNB2 and the initial AMF; the initial AMF initiates a redirection connection, and sends a Namf _ Communication _ N1MessageNotify message, a transport terminal NAS (Non-Access-Stratum) security Context, and SUPI and MM Context of the user to the target AMF. Because the network slice is used and the original AMF has already acquired the Allowed NSSAI (along with the corresponding NSI ID), the target AMF will terminate with the new updated N2. At this point, the slice completes registration on the target AMF.
According to the embodiment of the invention, a first AMF optional set which is based on terminal information and network capacity and is distributed by NSFF is obtained at a network side, a second AMF optional set which meets slice priority and conversation continuity requirements of a user intention is obtained at the terminal side, then multiple factors such as the slice priority, AMF load rate, base station and AMF return time delay and the like of the user are integrated, and an optimal AMF is selected as a redirected target AMF, so that matching of the network capacity and the user demand is realized, and quality of Qos of a slice is guaranteed
For more complete description of the technical solution of the present disclosure, as shown in fig. 2, a second embodiment of the present disclosure provides an AMF redirection method based on slice priority, including:
step S1: the UE completes registration on an RRC connection layer at the migrated base station gNB 2;
step S2: the gNB2 sends a Registration request message to the initial AMF;
step S3: the initial AMF sends a slice selection message to the NSSF;
step S4: the NSSF feeds back Nnssf _ NSSelection _ Get response information to the initial AMF, wherein the Nnssf _ NSSelection _ Get response information comprises the address and the routing information of the first selectable AMF set;
step S5: the initial AMF sends a first AMF optional set fed back by NSSF to a newly-added management network element;
step S6: the UE reports the slice sorting level and the SSCMODE selected by the user to the newly-added management network element, and reports an AMF selectable set 2 corresponding to the slice;
step S7: the newly added management network element obtains the slice comprehensive priority of the user in different scenes through neural network training; sequencing the AMFs in the AMF optional set 2 according to the slice comprehensive priority to form a second AMF optional set;
step S8: the newly increased management network element acquires the load rate of each AMF;
step S9: the newly-added management network element acquires the average time delay of the connection and return of the gNB2 to each AMF;
step S10: the newly-added management network element selects a target AMF according to the first AMF optional set, the second AMF optional set, the load rate of each AMF, the connection of the gNB2 to each AMF and the average return delay;
step S11: the newly added management network element sends the target AMF identification to the initial AMF;
step S12: the initial AMF initiates an AMF redirection to the target AMF.
In this embodiment, a supplementary explanation is provided for the first embodiment, and some specific details are not described in detail, which may specifically refer to the related description in the first embodiment of the method.
Fig. 3 is an architecture diagram of a newly added management network element according to a third embodiment of the present disclosure, as shown in fig. 3, including:
a first obtaining module 1, configured to obtain, on a network side, a first AMF selectable set allocated by a core network to a terminal when the terminal migrates from a first base station to a second base station;
a second obtaining module 2, configured to obtain, on the terminal side, a second AMF selectable set, where the second AMF selectable set includes multiple AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the multiple AMFs are sorted according to their respective corresponding comprehensive priority groups of each S-NSSAI;
a third obtaining module 3, configured to obtain the performance of each AMF in the first and second AMF alternative sets; and the number of the first and second groups,
and the selecting module 4 is configured to select one AMF from the first AMF optional set and the second AMF optional set as a target AMF for redirection according to the performance of each AMF.
Further, the newly added management network element further comprises a receiving module 5 and a sending module 6;
the receiving module 5 is configured to receive a first AMF alternative sent by an initial AMF;
the first AMF selectable set is sent to an initial AMF by a network slice selection function NSSF entity after the initial AMF sends a slice selection message to the NSSF entity according to the basic information of the terminal; and the basic information of the terminal is sent to the initial AMF after the second base station establishes Radio Resource Control (RRC) connection with the terminal and acquires the basic information of the terminal.
The first obtaining module 1 is specifically configured to obtain the first AMF alternative received by the receiving module 5.
Further, the newly added management network element further comprises a receiving module 5 and a sending module 6;
the receiving module 5 is configured to receive a third AMF option set message sent by the terminal, where the third AMF option set message includes a plurality of S-NSSAIs connected before the terminal disconnects from the first base station, a URSP rule corresponding to each S-NSSAI, and a session and service continuous MODE SSC-MODE corresponding to each S-NSSAI;
the sending module 6 is configured to send a session service ranking confirmation message to the terminal, so that the terminal returns the ranking of each session service selected by the user or preset by the terminal to the newly added management network element;
the second obtaining module 2 includes:
a first obtaining unit, configured to obtain the third AMF option set message received by the receiving module 5, and obtain a ranking level of each session service returned by the terminal and selected by the user or preset by the terminal;
the first confirming unit is set to confirm the S-NSSAI corresponding to each session service;
the first obtaining unit is further configured to obtain a preset priority of the SSC MODE corresponding to each network slice;
and the first sequencing unit is configured to perform comprehensive priority assessment on each S-NSSAI corresponding to each AMF in a third AMF selectable set currently connected to the terminal according to the sequencing level of each session service and the priority of the SSC MODE corresponding to each network slice, sequence each AMF according to the comprehensive priority group of each S-NSSAI corresponding to each AMF, and form a second AMF selectable set based on each AMF after the grouping and sequencing.
Further, the first confirming unit is specifically configured to:
acquiring APP-ID and OS-ID according to the identifier of the traffic descriptor corresponding to each network slice in the URSP rule corresponding to each S-NSSAI, wherein the APP-ID and the OS-ID are default identifiers of the traffic descriptor in the URSP rule set by the terminal side;
and obtaining the session service name corresponding to each S-NSSAI according to the APP-ID and the OS-ID, and confirming the S-NSSAI corresponding to each session service respectively according to the session service name corresponding to each S-NSSAI.
Further, the newly added management network element further includes a receiving module 5;
the receiving module 5 is configured to receive a third AMF option set message sent by the terminal, where the third AMF option set message includes a plurality of S-NSSAIs connected before the terminal disconnects from the first base station, a URSP rule corresponding to each S-NSSAI, and a session and service continuous MODE SSC-MODE corresponding to each S-NSSAI;
the second obtaining module 2 includes:
a first obtaining unit configured to obtain the third AMF option set message received by the receiving module 3;
the system comprises a collecting and training unit, a data processing unit and a data processing unit, wherein the collecting and training unit is used for collecting data corresponding to each S-NSSAI to perform artificial intelligence neural network machine training so as to obtain the comprehensive priority of each S-NSSAI under different scenes, and the data corresponding to each S-NSSAI comprises the safety isolation degree of slices, the communication reliability degree of the slices, the service occurrence time period, the service concurrency condition and the user terminal scene;
and the second sequencing unit is configured to acquire the comprehensive priority of each S-NSSAI in the current use scene of the terminal, sequence each AMF in a third AMF optional set currently connected with the terminal according to the comprehensive priority group of each S-NSSAI corresponding to the AMF, and form a second AMF optional set based on each AMF after the grouping and the sequencing.
Further, the newly added management network element further comprises a receiving module 5 and a sending module 6;
the sending module 6 is arranged to request the current AMF load rates from each AMF in the first and second AMF alternative sets;
the receiving module 5 is configured to receive the AMF load rates returned by the respective AMFs;
the sending module 6 is further configured to request the second base station to acquire each average time delay of connection between the second base station and each AMF in the first AMF optional set and the second AMF optional set;
the receiving module 5 is further configured to receive each average time delay sent by the second base station and used for establishing connection with each AMF;
the third obtaining module 3 is specifically configured to obtain the AMF load rates returned by the AMFs received by the receiving module; acquiring each average time delay which is sent by the second base station and is respectively connected with each AMF and received by the receiving module; and determined as the average delay of each AMF.
Further, the selecting module 4 includes:
a third validation unit arranged to determine whether there is a common AMF in the first and second AMF alternative sets;
a selecting unit configured to select, if the third confirming unit confirms that there is a common AMF, AMFs corresponding to a preset number of S-NSSAIs having higher overall priorities in a second AMF selectable set from the common AMF, and then select, as a target AMF, an AMF having a load rate and an average delay that satisfy preset requirements from AMFs corresponding to a preset number of S-NSSAIs having higher overall priorities; and
and if the third confirming unit confirms that the AMF is not shared, selecting the AMF with the load rate and the average time delay meeting the preset requirements from the first AMF selectable set as the target AMF.
The newly added management network element in the embodiment of the present disclosure is used to implement the slice priority based AMF redirection method in the first method embodiment, so that the description is simpler, and reference may be specifically made to the related description in the first method embodiment, and details are not described here again.
Furthermore, the embodiments of the present disclosure also provide a computer device, which includes a memory and a processor, where the memory stores a computer program, and when the processor runs the computer program stored in the memory, the processor executes the above-mentioned various possible methods.
In addition, the embodiments of the present disclosure also provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment executes the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC (Application Specific Integrated Circuit). Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication device.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.

Claims (10)

1. An AMF redirection method based on slice priority for an access and mobility management function entity is characterized by comprising the following steps:
when the terminal is migrated from the first base station to the second base station, the newly added management network element acquires a first AMF selectable set distributed to the terminal by a core network at a network side;
a newly-added management network element acquires a second AMF optional set at a terminal side, wherein the second AMF optional set comprises a plurality of AMFs respectively corresponding to each single network slice selection auxiliary information S-NSSAI connected before terminal migration, and the AMFs are sorted according to the comprehensive priority groups of the S-NSSAIs respectively corresponding to the AMFs;
the newly-added management network element acquires the performance of each AMF in the first AMF optional set and the second AMF optional set; and the number of the first and second groups,
and the newly-added management network element selects one AMF as a redirected target AMF according to the first AMF optional set and the second AMF optional set and the performance of each AMF.
2. The method of claim 1, wherein the acquiring, by the newly added management network element, the first AMF option set allocated by the core network to the terminal at the network side includes:
the newly added management network element receives a first AMF selectable set sent by an initial AMF;
the first AMF selectable set is sent to an initial AMF by a network slice selection function NSSF entity after the initial AMF sends a slice selection message to the NSSF entity according to the basic information of the terminal; and the basic information of the terminal is sent to the initial AMF after the second base station establishes Radio Resource Control (RRC) connection with the terminal and acquires the basic information of the terminal.
3. The method of claim 1, wherein the acquiring, by the newly added management network element, the second AMF alternative at the terminal side comprises:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected with the first base station, a UE route selection policy URSP rule corresponding to each S-NSSAI, and a session and service continuous MODE SSC-MODE corresponding to each S-NSSAI;
the newly increased management network element sends a session service sequencing level confirmation message to the terminal so that the terminal returns the sequencing level of each session service selected by a user or preset by the terminal to the newly increased management network element;
the newly increased management network element confirms the S-NSSAI corresponding to each session service respectively;
the newly-added management network element acquires the preset priority of SSC MODE corresponding to each network slice; and the number of the first and second groups,
and the newly-added management network element performs comprehensive priority evaluation on each S-NSSAI corresponding to each AMF in a third AMF selectable set currently connected with the terminal according to the sorting level of each session service and the priority of the SSC MODE corresponding to each network slice, sorts each AMF according to the comprehensive priority group of each S-NSSAI corresponding to each AMF, and forms a second AMF selectable set based on each AMF after the grouping sorting.
4. The method of claim 3, wherein the determining, by the newly added management network element, the S-NSSAIs respectively corresponding to the session services comprises:
the newly-added management network element acquires an application APP-ID and a system OS-ID according to the identifier of the traffic descriptor corresponding to each network slice in the URSP rule corresponding to each S-NSSAI, wherein the APP-ID and the OS-ID are default identifiers of the traffic descriptor in the URSP rule set by the terminal side; and the number of the first and second groups,
and obtaining the session service name corresponding to each S-NSSAI according to the APP-ID and the OS-ID, and confirming the S-NSSAI corresponding to each session service respectively according to the session service name corresponding to each S-NSSAI.
5. The method of claim 1, wherein the acquiring, by the newly added management network element, the second AMF alternative at the terminal side comprises:
the newly-added management network element receives a third AMF optional set message sent by the terminal, wherein the third AMF optional set message comprises a plurality of S-NSSAIs connected before the terminal is disconnected with the first base station, a URSP rule corresponding to each S-NSSAI, and an SSC-MODE corresponding to each S-NSSAI;
the newly-added management network element collects data corresponding to each S-NSSAI to perform artificial intelligence neural network machine training, and obtains the comprehensive priority of each S-NSSAI under different scenes, wherein the data corresponding to each S-NSSAI comprises the safety isolation of a network slice, the communication reliability of the network slice, a service occurrence period, a service concurrency condition and a user terminal using scene; and the number of the first and second groups,
and the newly added management network element acquires the comprehensive priority of each S-NSSAI in the current use scene of the terminal, performs grouping ordering on each AMF in a third AMF optional set which is currently connected with the terminal according to the comprehensive priority of each S-NSSAI respectively corresponding to each AMF, and forms a second AMF optional set based on each AMF subjected to grouping ordering.
6. The method according to claim 3 or 5, wherein the obtaining, by the newly added management network element, the performance of each AMF in the first and second AMF alternatives comprises:
the newly-added management network element requests the current AMF load rate of each AMF in the first AMF selectable set and the second AMF selectable set and receives the AMF load rate returned by each AMF; and the number of the first and second groups,
and the newly-added management network element requests the second base station to acquire each average time delay for establishing connection with each AMF in the first AMF optional set and the second AMF optional set, receives each average time delay for establishing connection with each AMF sent by the second base station, and determines the average time delay as the average time delay of each AMF.
7. The method of claim 6, wherein the selecting, by the newly added management network element, one AMF from the first AMF option set and the second AMF option set as the redirected target AMF according to the performance of each AMF comprises:
the newly-added management network element determines whether the first AMF optional set and the second AMF optional set have a common AMF or not;
if the shared AMF exists, selecting AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity in the second AMF optional set from the shared AMF, and selecting AMFs with load rates and average time delays meeting preset requirements from the AMFs corresponding to the S-NSSAIs with higher comprehensive priority and preset quantity as target AMFs;
and if the common AMF does not exist, selecting the AMF with the load rate and the average time delay meeting the preset requirement from the first AMF selectable set as the target AMF.
8. An add-on management network element, comprising:
the first acquisition module is configured to acquire a first AMF selectable set allocated to the terminal by a core network at a network side when the terminal migrates from a first base station to a second base station;
a second obtaining module configured to obtain, at a terminal side, a second AMF selectable set, where the second AMF selectable set includes multiple AMFs respectively corresponding to each S-NSSAI connected before terminal migration, and the multiple AMFs are sorted by their respective corresponding integrated priority groups of each S-NSSAI;
a third obtaining module configured to obtain performance of each AMF in the first and second AMF alternative sets; and the number of the first and second groups,
and the selecting module is configured to select one AMF from the first AMF selectable set and the second AMF selectable set as a target AMF for redirection according to the performance of each AMF.
9. A computer device comprising a memory and a processor, the memory having a computer program stored therein, the processor, when executing the computer program stored by the memory, performing the slice priority based AMF redirection method according to any of claims 1-7.
10. A computer-readable storage medium, comprising: computer program which, when run on a computer, causes the computer to perform the slice priority based AMF redirection method according to any of claims 1-7.
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