CN111314134B - Method for dynamically generating AMF slice set by 5G core network - Google Patents

Abstract

The invention provides a method for dynamically generating an AMF slice set by a 5G core network, when slice information of a base station is changed, a base station sends a message to the AMF, the AMF submits the content of the received message to NSSF through a slice updating message, the NSSF calculates and generates the AMF slice set and the slice set supported by the AMF under each base station according to the slice set supported by the base station and in combination with the slice set supported in an operator strategy, the slice set supported by the AMF under each base station is returned to the base station through the AMF, and the NSSF updates the AMF slice set to NRF. The AMF slice set can be dynamically generated according to the slice set of each TA under the accessed base station and the operator strategy, and a network administrator does not need to plan and configure again, so that the network management efficiency is improved. And the accuracy of AMF selection can be improved, the occurrence of AMF redirection is reduced, and the network efficiency is improved.

Description

Method for dynamically generating AMF slice set by 5G core network

Technical Field

The invention relates to the technical field of 5G mobile communication, in particular to a method for dynamically generating an AMF slice set by a 5G core network.

Background

In 5G networks, the concept of Network Slicing (NS) is introduced, by which a 5G physical Network is divided into logically sliced networks. Wherein, the access and mobile management network element AMF of the signaling plane in the 5G core network (5 GC for short) may belong to one or more slice networks. The network slice to which the AMF belongs is determined by a corresponding AMF slice set NSSAI configured on a network slice selection function NSSF.

In a 5G network a single network slice selection assistance information S-NSSAI is used to identify one network slice, and multiple S-NSSAIs may be combined into one network slice selection assistance information set NSSAI. The slice set NSSAI (denoted as NSSAI) of AMF in 5GC is defined in the TS 3GPP 23501-g30 protocol_(AMF)) And can be configured on the AMF or the network slice selection function NSSF. When the UE initially registers, a base station gNB and an AMF are selected for registering according to the requested NSSAI, and when the NSSF obtains the subscribed NSSAI of the UE through the AMF, the UE and the NSSAI are combined_(AMF)Comparing and judging whether the AMF supports the request NSSAI and the subscription NSSAI of the UE, if not, carrying out AMF reselectionAnd (6) selecting a process. Therefore NSSAI_(AMF)The slice resource needs to be kept in dynamic consistency with the slice resource supported by the AMF, otherwise, the frequent AMF reselection process is caused to reduce the network efficiency, and even the AMF which does not possess a certain slice resource is selected to serve the corresponding slice of the UE, so that a network error is caused. And when the slice set of the AMF is inconsistent with the slice resources, certain slice resources can not be utilized, and network resources are wasted.

In the current TS 3GPP 23501-g30 protocol, a generation method of AMF slice set is not described, and static configuration can be performed according to an operator policy, but the static configuration has the following disadvantages: when the terminal user equipment UE registers to the 5GC, if the slice set configured by the registered AMF is inconsistent with network resources owned by the AMF, an AMF reselection process is frequently executed, the network efficiency is reduced, even a network error is caused because AMF without certain slice resources actually is selected for providing services, and when the configured supporting slice is less than the slice resources actually owned by the AMF, certain slice resources can be wasted due to unavailable use; when the AMF is added with a network slice resource, the slice set configured by the AMF needs to be changed, otherwise, the newly added AMF network slice resource cannot be used, and when the network resource owned by the AMF does not support certain slices, if the slice set configured by the AMF is not modified in time, the AMF with a wrong selection can be caused, so that the AMF slice set needs to be modified when the network resource is modified every time, and when the number of the AMFs is large, the burden of a network administrator can be greatly increased under the complex network deployment condition.

The Chinese patent application publication number is CN109219111A, the invention name is 'slice selection method and device', mainly describes the method and strategy in slice selection, and does not say how the AMF slice set is generated; chinese patent application publication No. CN109964509A entitled "method for selecting network node in wireless communication system and device thereof" describes a method for selecting AMF service according to AMF slice set, and does not describe how to dynamically generate the AMF slice set.

Disclosure of Invention

In view of the above, to solve the problems in the prior art, the present invention provides a method for dynamically generating an AMF slice set by a 5G core network.

The technical scheme of the invention is as follows:

a method for dynamically generating AMF slice set in 5G core network includes sending message to AMF by base station when slice information of base station is changed, submitting received message to NSSF by AMF, calculating and generating AMF slice set and AMF supported slice set under each base station by NSSF according to slice set supported by base station and combining slice set supported and forbidden in operation business strategy, and returning AMF supported slice set under each base station to base station through AMF.

Preferably, NSSF updates the AMF slice set to NRF.

Preferably, the message is a base station connection request message or a base station configuration update message.

Preferably, the method for dynamically generating the AMF slice set when a base station is newly added comprises the following steps:

step S1, when a new base station is added, the new base station sends a base station connection request message to the AMF, and the base station connection request message carries the base station slice set of the new base station;

step S2, the AMF submits the base station connection request message carrying the base station slice set to NSSF, a new AMF slice set and a slice set supported by the AMF under each base station are generated by NSSF calculation, and the NSSF updates the generated AMF slice set to NRF;

step S3, the NSSF returns the slice set supported by the AMF under each base station to the newly added base station through the AMF.

Preferably, the method for dynamically generating the AMF slice set when the slice set of the base station changes includes the following steps:

step S1', when the slice set of the base station is changed, the base station sends out a base station configuration update message to the AMF, and the updated slice set of the base station is carried in the base station configuration update message;

step S2', AMF submits the base station configuration update message carrying the updated base station slice set to NSSF, NSSF calculates to generate a new AMF slice set and a slice set supported by AMF under each base station, NSSF updates the new AMF slice set to NRF;

step S3', NSSF returns the slice set supported by AMF under each base station to the base station through AMF.

Preferably, the method for dynamically generating the AMF slice set when the base station is removed includes the following steps:

step S1', when AMF recognizes that the communication link of a certain base station is disconnected, AMF sends a base station configuration update message to NSSF, and the base station configuration update message carries an updated base station slice set;

step S2 ″, the NSSF calculates and generates a new AMF slice set according to the updated base station slice set, and updates the AMF slice set in the NRF.

Preferably, the formula for generating the new AMF slice set by calculation is as follows:

NSSAI_(AMF)＝NSSAI_{(Default AMF)}∪NSSAI_(Supported)-NSSAI_(Restricted)wherein:

NSSAI_{(Default AMF)}the AMF slice set is in a default state;

NSSAI_(Supported)a slice set supported in operator policy;

NSSAI_(Restricted)for the set of slices disabled in the operator policy.

Preferably, the calculation formula of the AMF slice set in the default state is:

NSSAI_{(Default AMF)}＝NSSAI_1_(TA)∪NSSAI_2_(TA)∪...∪NSSAI_i_(TA)wherein:

NSSAI_1_(TA)for the base station slice set of the first base station, NSSAI _ i_(TA)A base station slice set for the ith base station.

Preferably, the formula for calculating and generating a new slice set supported by the AMF at each base station is as follows:

NSSAI_{(Supported TA)}＝NSSAI_(TA)∩NSSAI_(AMF)wherein:

NSSAI_(TA)a base station slice set is obtained;

NSSAI_(AMF)is a slice set of AMF.

The invention has the beneficial effects that:

NSSAI of the invention_(AMF)Can be dynamically generated according to the slice set of each Tracking Area address (TA) under the accessed base station gNB and the operator strategy, and does not need a network administrator to re-plan and configure NSSAI_(AMF)And the network management efficiency is improved. NSSAI with gNB-supported slice changes in 5GC_(AMF)The consistency can be kept in real time, and AMF selection errors and network resource waste caused by the inconsistency are avoided. Due to NSSAI_(AMF)The NSSAI of the gNB is dynamically generated according to the algorithm, so that the AMF selection accuracy can be improved, the AMF redirection occurrence is reduced, and the network efficiency is improved.

Drawings

FIG. 1 is a diagram of NSSAI update upon addition of a new gNB according to the present invention_(AMF)A network topology map of (a);

FIG. 2 is a diagram of NSSAI update upon addition of a new gNB according to the present invention_(AMF)The communication flow chart of (1);

FIG. 3 shows NSSAI in gNB according to the present invention_(TA)Updating NSSAI on change_(AMF)A network topology map of (a);

FIG. 4 shows NSSAI in gNB according to the present invention_(TA)Updating NSSAI on change_(AMF)The communication flow chart of (1);

FIG. 5 shows the present invention with the gNB removed and NSSAI updated_(AMF)A network topology map of (a);

FIG. 6 shows the present invention with the gNB removed and NSSAI updated_(AMF)The communication flow chart of (1);

FIG. 7 shows NSSF-generated NSSAI of the present invention_(AMF)A flow chart of (1);

FIG. 8 is a diagram of NSSAI calculation according to the present invention_(AMF)、NSSAI_(TA)Schematic diagram of the algorithm of (1).

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The invention discloses a method for dynamically generating an AMF slice set in a 5G core network, which is characterized in that when slice information of a base station is changed, the base station sends a message to an access and mobility management function AMF, the access and mobility management function AMF submits the received message to a network slice selection function NSSF, and the NSSF calculates and generates an AMF slice set NSSAI according to a slice set supported by the AMF accessed base station and by combining a slice strategy configured by an operator_(AMF)And slice set NSSAI supported by AMF under each base station_{(SupportedTA)}And the slice set NSSAI supported by AMF under each base station_{(SupportedTA)}And returns to the base station gNB through AMF. Optionally, the NSSF may update the NSSAI to the network repository function network element NRF_(AMF)Implementing dynamic modification of NSSAI_(AMF)And (5) configuring.

Example one

In the method for dynamically generating AMF slice set in 5G core network of this embodiment, NSSAI is updated when a new gNB is added_(AMF)As shown in fig. 1 and 2. Fig. 1 is a network topology diagram. This embodiment updates NSSAI when a new gNB _1 is added_(AMF)The process of (1). Slice set NSSAI supported by each tracking area under gNB _1_(TA)Comprising { S-NSSAI _1, S-NSSAI _2, S-NSSAI _3}, when the access and mobility management function AMF receives the connection message of gNB _1, it will set the slice set NSSAI of gNB _1_(TA)Submitting to network slice selection function NSSF for calculation, and generating new NSSAI by NSSF_(AMF)Regenerated in the figure, new NSSAI_(AMF)An S-NSSAI _3 slice is newly added.

Fig. 2 is a communication flow chart, which specifically includes the following steps:

step S1, when a new base station gNB _1 joins 5GC, it sends a base station connection request message NGSetupRequest to AMF, where the base station connection request message carries a base station slice set NSSAI_(TA)；

Step S2, AMF will carry NSSAI_(TA)The base station connection request message is submitted to NSSF, and a new AMF slice set NSSAI is generated by NSSF calculation_(AMF)And slice set NSSAI supported by AMF under each base station_{(SupportedTA)}The NSSF updates the generated AMF slice set to NRF;

the process of NSSF calculation to generate a new AMF slice set is shown in fig. 7, and includes the following steps:

when NSSF receives NSSAI sent by AMF_(TA)NSSAI generation by use after message and data changes_(AMF)Calculation of NSSAI by algorithm and operator-made strategy_(AMF)Thereafter, NSSAI is updated to NRF_(AMF)And the NSSAI calculated similarly_{(SupportedTA)}And returning to AMF and gNB.

FIG. 8 is a graph of NSSAI calculation_(AMF)、NSSAI_(TA)Schematic diagram of the algorithm of (1).

Updating NSSAI when NSSF receives AMF_(TA)Message of (2), NSSAI _1 which will update changed gNB _1_(TA)And another slice set NSSAI _2 of the AMF_(TA)Performing union set calculation to obtain slice set NSSAI supported by AMF in default state (the operator does not configure the slice strategy state)_(DefaultAMF)Then merging the operator configured slicing strategy, if a certain slice is supported in the strategy, such as S-NSSAI _4, then in NSSAI_(DefaultAMF)Increase S-NSSAI _4, if the strategy forbids the use of a certain slice, such as S-NSSAI _1, then in NSSAI_(DefaultAMF)And NSSAI _1_(TA)Deleting S-NSSAI _1, and finally calculating to obtain NSSAI_(AMF)And NSSAI _3_{(SupportedTA)}. The algorithm is applicable to cases where gNB is added, NSSAI _1(TA) is changed, and gNB is removed.

NSSAI is derived from the above algorithm flow_(AMF)Calculating the formula:

NSSAI_1_(TA)∪NSSAI_2_(TA)∪...∪NSSAI_i_(TA)＝NSSAI_{(Default AMF)}

in the formula, it is assumed that there are i NSSAI of gNB in NSSF_(TA)Taking all NSSAI_(TA)Merging, calculating AMF slice set NSSAI of AMF in default state_{(Default AMF)}。

NSSAI_{(Default AMF)}∪NSSAI_(Supported)-NSSAI_(Restricted)＝NSSAI_(AMF)

NSSAI in the formula_{(Default AMF)}And the slice set NSSAI supported in the operator policy_(Supported)Performing a union set calculation and then combining with the NSSAI disabled in the operator policy_(Restricted)Taking the complement set to obtain the slice set NSSAI supported by AMF_(AMF)。

NSSAI_{(Supported TA)}Calculating the formula:

NSSAI_(TA)∩NSSAI_(AMF)＝NSSAI_{(Supported TA)}

NSSAI in the formula_(TA)Slice set NSSAI for base station slice set and AMF_(AMF)Obtaining the slice set NSSAI of AMF allowing gNB access by taking intersection_{(Supported TA)}。

Step S3, NSSF calculates slice set NSSAI supported by AMF under each base station_{(SupportedTA)}Returned to gNB _1 via AMF.

Preferably, in step S3, the NSSF may update the NSSAI to the NRF_(AMF)Implementing dynamic modification of NSSAI_(AMF)And (5) configuring.

Example two

The method for dynamically generating the AMF slice set in the 5G core network of this embodiment is a base station slice set NSSAI_(TA)Updating NSSAI on change_(AMF)As shown in fig. 3 and 4. FIG. 3 shows NSSAI in gNB _1_(TA)Change update NSSAI_(AMF)Network topology map, NSSAI of gNB _1 in the map_(TA)Changing, then sending a base station configuration update message to the AMF, and the AMF submitting the updated NSSAI to the NSSF_(TA)NSSF recalculation to NSSAI_(AMF)And update to NRFNSSAI_(AMF)。

Return NSSAI_{(SupportedTA)}To gNB _ 1. Optionally updating NSSAI on NRF_(AMF)And are and

the method comprises the following specific steps:

NSSAI of step S1', gNB _1_(TA)When the change is made, sending out a base station configuration update message RANConfiguration update to the AMF, and carrying the updated base station slice set NSSAI_(TA)；

Step S2', AMF will carry the updated base station slice set NSSAI_(TA)The base station configuration update message is submitted to NSSF for calculation to generate a new AMF slice set NSSAI_(AMF)And slice set NSSAI supported by AMF under each base station_{(SupportedTA)}NSSF updates the new AMF slice set to NRF;

new AMF slice set NSSAI in this example_(AMF)And slice set NSSAI supported by AMF under each base station_{(SupportedTA)}The calculation method is the same as the first embodiment, and is not described herein again.

Step S3', NSSF calculates slice set NSSAI supported by AMF under each base station_{(SupportedTA)}Returned to gNB _1 via AMF.

Preferably, in step S3', NSSF may update NSSAI to NRF_(AMF)And the slice set supported by the AMF is dynamically adjusted without changing the network configuration again.

EXAMPLE III

In the method for dynamically generating AMF slice set in 5G core network of this embodiment, the base station is removed and NSSAI is updated_(AMF)As shown in fig. 5 and 6. FIG. 5 shows that gNB _1 is removed to update NSSAI_(AMF)A network topology diagram, in which, the gNB _1 is removed due to the network deployment requirement or failure, etc., the AMF recognizes that the gNB _1 link is disconnected, and then submits the updated NSSAI to the NSSF_(TA)NSSF recalculation to NSSAI_(AMF)Simultaneous NSSAI update to NRF_(AMF)。

The method comprises the following specific steps:

step S1 ″, after AMF recognizes that the communication link of base station gNB _1 is disconnected, it sends the base station configuration to NSSFUpdate message carrying updated NSSAI in base station configuration update message_(TA)。

Step S2', the NSSF calculates and generates new NSSAI according to the updated NSSAI (TA)_(AMF)And updates NSSAI in NRF_(AMF)。

New AMF slice set NSSAI in this example_(AMF)The calculation method is the same as the first embodiment, and is not described herein again.

The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.

Claims (8)

1. A method for dynamically generating an AMF slice set by a 5G core network is characterized by comprising the following steps: when the slice information of the base station is changed, the base station sends a message to the AMF, the AMF submits the received message to the NSSF, the NSSF calculates and generates an AMF slice set and a slice set supported by the AMF under each base station according to the slice set supported by the base station and by combining the slice sets supported and forbidden in the operator strategy, and returns the slice set supported by the AMF under each base station to the base station through the AMF;

the method for dynamically generating the AMF slice set when a base station is newly added comprises the following steps:

step S1, when a new base station is added, the new base station sends a base station connection request message to the AMF, and the base station connection request message carries the base station slice set of the base station;

step S2, the AMF submits the base station connection request message carrying the base station slice set to NSSF, a new AMF slice set and a slice set supported by the AMF under each base station are generated by NSSF calculation, and the NSSF updates the generated AMF slice set to NRF;

step S3, the NSSF returns the slice set supported by the AMF under each base station to the newly added base station through the AMF.

2. The method of claim 1, wherein the method for dynamically generating the AMF slice set by the 5G core network comprises: NSSF updates the AMF slice set to NRF.

3. The method for dynamically generating the AMF slice set by the 5G core network according to claim 1 or 2, wherein: the message is a base station connection request message or a base station configuration update message.

4. The method of claim 3, wherein the method for dynamically generating the AMF slice set by the 5G core network comprises: the method for dynamically generating the AMF slice set when the slice set of the base station is changed comprises the following steps:

step S1', when the slice set of the base station is changed, the base station sends out a base station configuration update message to the AMF, and the updated slice set of the base station is carried in the base station configuration update message;

step S2', AMF submits the base station configuration update message carrying the updated base station slice set to NSSF, NSSF calculates to generate a new AMF slice set and a slice set supported by AMF under each base station, NSSF updates the new AMF slice set to NRF;

step S3', NSSF returns the slice set supported by AMF under each base station to the base station through AMF.

5. The method of claim 3, wherein the method for dynamically generating the AMF slice set by the 5G core network comprises: the method for dynamically generating the AMF slice set when the base station is removed comprises the following steps:

step S1', when AMF recognizes that the communication link of a certain base station is disconnected, AMF sends a base station configuration update message to NSSF, and the base station configuration update message carries an updated base station slice set;

step S2 ″, the NSSF calculates and generates a new AMF slice set according to the updated base station slice set, and updates the AMF slice set in the NRF.

6. The method for dynamically generating AMF slice sets by a 5G core network according to any one of claims 1, 4 or 5, wherein: the formula for generating the new AMF slice set by calculation is as follows:

NSSAI_(AMF)＝NSSAI_{(Default AMF)}∪NSSAI_(Supported)-NSSAI_(Restricted)wherein:

NSSAI_{(Default AMF)}the AMF slice set is in a default state;

NSSAI_(Supported)a slice set supported in operator policy;

NSSAI_(Restricted)for the set of slices disabled in the operator policy.

7. The method of claim 6, wherein the method for dynamically generating the AMF slice set by the 5G core network comprises: the calculation formula of the AMF slice set in the default state is as follows:

NSSAI_{(Default AMF)}＝NSSAI_1_(TA)∪NSSAI_2_(TA)∪...∪NSSAI_i_(TA)wherein:

NSSAI_1_(TA)for the base station slice set of the first base station, NSSAI _ i_(TA)A base station slice set for the ith base station.

8. The method for dynamically generating AMF slice sets in a 5G core network according to claim 4 or 5, wherein: the new slice set supported by the AMF under each base station is generated by calculation according to the following calculation formula:

NSSAI_{(Supported TA)}＝NSSAI_(TA)∩NSSAI_(AMF)wherein:

NSSAI_(TA)a base station slice set is obtained;

NSSAI_(AMF)is a slice set of AMF.

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