CN114025343B - Communication method, UE, AMF and communication system - Google Patents

Abstract

The present disclosure provides a communication method applied to a first AMF, the communication method comprising: responding to a second registration request sent by the first UE, and sending a query to a home network, wherein the second registration request carries first auxiliary information and first network information; in the query result, if the first auxiliary information of the first UE belongs to a home network and a service corresponding to the first network exists in the home network, distributing second auxiliary information for the first UE; and advertising the second auxiliary information and the mapping relation between the second auxiliary information and the first auxiliary information to the first UE. The disclosure also provides a communication method applied to the first UE. The disclosure also provides a UE, an AMF and a communication system.

Description

Communication method, UE, AMF and communication system

technical field

The present disclosure relates to the communication field, and in particular, relates to a communication method, a user equipment (UE, User Equipment), an access management function entity (AMF, Access Management Function) and a communication system.

Background technique

Non-public networks (NPN, Non-public networks) are defined in the 5G network. NPN is used by private entities such as enterprises and can be deployed using virtual appliances or physical appliances. The NPN can be deployed as a completely independent network, and can also be hosted by a Public Land Mobile Network (PLMN, Public Land Mobile Network) or provided as a part of the PLMN.

A completely independently deployed NPN is called an independent non-public network (S-NPN, Stand-alone Non-Public Network), while an NPN hosted by a PLMN or provided as part of a PLMN is called a public network-based NPN (PNI-NPN, Public Network Integrated Non-Public Network). PNI-NPN can be implemented by specifying a specific data network (DNN, Data Network Name), or can be divided into independent network resources for NPN on the PLMN by means of fragmentation.

Contents of the invention

The present disclosure provides a communication method, a UE, an AMF and a communication system.

In a first aspect, the present disclosure provides a communication method, which is applied to a first user equipment UE, and the communication method includes:

Initiate a first registration request to the first access management function entity AMF of the roaming network, where the first registration request carries first auxiliary information dedicated to the home network;

When the first auxiliary information and its mapping value in the roaming network are not permitted, initiate a second registration request to the first AMF, the second registration request carrying the first auxiliary information and first network information, for the first AMF to allocate mapping values and network resources to the first auxiliary information according to the first auxiliary information;

Wherein, the first auxiliary information includes the single network slice selection auxiliary information S-NSSAI subscribed in the home network, and the first network information includes the network identifier of the first network in the home network .

In a second aspect, the present disclosure provides a communication method, which is applied to a first AMF, and the communication method includes:

In response to receiving a second registration request, sending a query to the home network, where the second registration request is a second registration request sent by the first UE in any one of the communication methods in the first aspect, the The second registration request carries the first auxiliary information and the first network information;

In the query result, if the first assistance information of the first UE belongs to the home network, and there is a service corresponding to the first network in the home network, then the first The UE allocates second auxiliary information;

Notifying the first UE of the second auxiliary information and a mapping relationship between the second auxiliary information and the first auxiliary information.

Specifically, the allocating the second assistance information to the first UE includes:

establishing a mapping relationship between the second auxiliary information and the first auxiliary information;

Allocating corresponding network resources for the second auxiliary information includes the AMF, the session management function entity SMF, and the user plane function entity UPF in the roaming network carrying the network connection of the user equipment to the first network.

Further, after notifying the first UE of the second auxiliary information and the mapping relationship between the second auxiliary information and the first auxiliary information, the method further includes:

When all user equipments using the second auxiliary information leave the coverage area of the roaming network, release the network resources corresponding to the second auxiliary information.

In a third aspect, the present disclosure provides a UE for a first UE, wherein the UE includes:

The first registration module is configured to initiate a first registration request to the first AMF of the roaming network, where the first registration request carries first auxiliary information dedicated to the home network;

A second registration module, configured to initiate a second registration request to the first AMF when the first auxiliary information and its mapping value in the roaming network are not permitted, in the second registration request carrying the first auxiliary information and first network information, for the first AMF to allocate mapping values and network resources to the first auxiliary information according to the first auxiliary information;

Wherein, the first auxiliary information includes the single network slice selection auxiliary information S-NSSAI subscribed in the home network, and the first network information includes the network identifier of the first network in the home network .

In a fourth aspect, the present disclosure provides an AMF for a first AMF, wherein the AMF includes:

A registration home query module, configured to send a query to the home network in response to receiving a second registration request, wherein the second registration request is sent by the first UE in any one of the communication methods in the first aspect A second registration request, where the second registration request carries the first auxiliary information and the first network information;

An auxiliary information allocation module, configured to, in the query result, if the first auxiliary information of the first UE belongs to the home network, and there is a service corresponding to the first network in the home network , assigning second auxiliary information to the first UE;

The auxiliary information notifying module notifies the first UE of the second auxiliary information and a mapping relationship between the second auxiliary information and the first auxiliary information.

Further, the auxiliary information allocation module includes:

An auxiliary information mapping submodule, configured to establish a mapping relationship between the second auxiliary information and the first auxiliary information;

The resource allocation submodule is configured to allocate corresponding network resources for the second auxiliary information, including the AMF in the roaming network, the session management function entity SMF, and the user plane function entity UPF carrying the user equipment to the network of the first network connect.

Further, the AMF also includes:

A resource recycling module, configured to release network resources corresponding to the second auxiliary information when all user equipments using the second auxiliary information leave the coverage area of the roaming network.

In a fifth aspect, the present disclosure provides a communication system, where the communication system includes a first UE and a first AMF, wherein,

The first UE is the first UE in the communication method described in the first aspect;

The first AMF is the first AMF in any one of the communication methods in the second aspect;

The first AMF is also used for:

If the first auxiliary information carried in the first registration request sent by the first UE has been allowed in the roaming network, reply the second auxiliary information to the first UE, and the second auxiliary information and the The mapping relationship of the first auxiliary information is used to enable the first UE to connect to the network resources of the first network in the home network.

Further, the communication system further includes: a first network segment selection function entity NSSF of the roaming network, a first unified data management function entity UMD of the roaming network, a second NSSF of the home network, and a second NSSF of the home network Two UMDs;

The first AMF is further configured to: after receiving the second registration request from the first UE, according to the first auxiliary information carried in the second registration request, instruct the first NSSF to query the second NSSF for the Whether the first UE belongs to the home network, instructing the first UMD to query the second UMD whether the first UE exists in the home network corresponding to the first network information services;

determining whether to allocate second auxiliary information according to a query result of the first NSSF and the first UMD.

The communication method provided by the present disclosure initiates registration with the first AMF of the roaming network according to the first auxiliary information that the first UE has registered in the home location, and the first AMF allocates the second auxiliary information and related resources, and establishes the first auxiliary information. Information and the mapping relationship between the second auxiliary information, when other UEs subsequently apply for registration with the first AMF based on the first auxiliary information, they can directly use the established mapping relationship and related resources, which not only solves the problem of connecting the user equipment to the home network The problem that the post-roaming network is invisible to bearer services is convenient for the roaming network to provide corresponding service quality guarantees. Using this method can solve the problem of low resource usage efficiency caused by the need to respectively establish their own tunnels when multiple users are connected to the same PNI-NPN at the same time.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the description, together with the following specific embodiments, are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the attached picture:

FIG. 1 is a flowchart of a communication method provided by an embodiment of the present disclosure used for a first UE;

FIG. 2 is a flowchart of another communication method provided by an embodiment of the present disclosure used for a first UE;

FIG. 3 is a flowchart of a communication method provided by an embodiment of the present disclosure used in a first AMF;

FIG. 4 is a flowchart of another communication method provided by an embodiment of the present disclosure used in the first AMF;

Fig. 5 is a flow chart of still another communication method provided by an embodiment of the present disclosure for the first AMF;

FIG. 6 is a schematic diagram of a UE provided by an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of another UE provided by an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of an AMF provided by an embodiment of the present disclosure;

FIG. 9 is a schematic diagram of an AMF neutron module provided by an embodiment of the present disclosure;

FIG. 10 is a schematic diagram of an AMF neutron module provided by an embodiment of the present disclosure;

FIG. 11 is a schematic diagram of another AMF provided by an embodiment of the present disclosure;

Fig. 12 is a sequence diagram of connecting to a PNI-NPN carried by a home network in a roaming state provided by an embodiment of the present disclosure.

Detailed ways

In order to enable those skilled in the art to better understand the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only It is an embodiment of a part of the present disclosure, but not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present disclosure.

In 3GPP TS 23.501, a method of connecting to the S-NPN through a non-3GPP interworking function entity (N3IWF, Non-3GPP InterWorking Function) is defined. This method is generally only for S-NPN networks. Although for the case of PNI-NPN, user equipment (UE, User Equipment) can also be connected to the PNI-NPN by referring to the method of S-NPN. For example: when the UE is in the roaming network, it first connects to the N3IWF in the home network through the tunnel technology, and then connects to the NPN through the N3IWF. However, the disadvantages of this method are: (1) For the roaming network, the service type carried in the tunnel connecting the UE to the N3IWF is invisible to the roaming network, and it is not convenient for the roaming network to provide corresponding service quality guarantees. (2) When multiple users under the same base station (or the same routing area, or the same tracking area) need to connect to the same PNI-NPN at the same time, they still need to establish their own tunnels, which reduces the efficiency of resource usage.

How to provide QoS guarantee for UE and improve resource usage efficiency in a roaming network is a problem to be solved in this disclosure.

The idea of the communication method provided in the present disclosure is to initiate registration with a roaming access management function entity (AMF, Access Management Function) according to the first auxiliary information that the UE has registered in the home location. When the UE finds that the first auxiliary information is not permitted in the roaming network, it carries the first auxiliary information dedicated to bearer on the home network and initiates registration again. The AMF allocates the second auxiliary information and related resources, and notifies the UE of the mapping between the first auxiliary information and the second auxiliary information. When another UE subsequently applies for registration with the AMF based on the first auxiliary information, it can directly use the established mapping relationship and related resources.

In a first aspect, an embodiment of the present disclosure provides a communication method for a first UE, as shown in FIG. 1 , the steps of the method include:

Step S110, initiate a first registration request to the first AMF of the roaming network, and the first registration request carries first auxiliary information dedicated to the home network;

Step S120, when the first auxiliary information and its mapping value in the roaming network are not permitted, initiate a second registration request to the first AMF, the second registration request carrying the first Auxiliary information and first network information, for the first AMF to allocate mapping values and network resources to the first auxiliary information according to the first auxiliary information;

Wherein, the first assistance information includes Single Network Slice Selection Assistance Information (S-NSSAI, Single Network Slice Selection Assistance Information) that has been subscribed in the home network, and the first network information includes A network identifier in the home network.

The technical solution disclosed in the present disclosure can solve the problem of low resource utilization efficiency caused by the need to establish respective tunnels when multiple users are connected to the same PNI-NPN at the same time. Therefore, in the embodiments of the present disclosure, for the convenience of description, the first network takes PNI-NPN as an example, and the first network information is the network identifier of the PNI-NPN in the home network. It should be noted that the first network includes but is not limited to a PNI-NPN network, and may also be other network types applicable to the technical solution of the present disclosure.

As mentioned above, in order to connect to the home PNI-NPN network, the first UE in the roaming network first uses the Network Slice Selection Assistance (NSSAI, Network Slice Selection Assistance) carrying the first assistance information S-NSSAI#1 Information) initiates a first registration request to the first AMF of the roaming network. The first AMF returns the NSSAI allowed to be used by the user equipment to the first UE. If the NSSAI returned by the first AMF does not contain the S-NSSAI#1 requested by the first UE, the first UE will immediately initiate a second registration request to the first AMF with the NSSAI that only carries S-NSSAI#1, and will S-NSSAI#1 is marked as "applied to PNI-NPN", and contains the network identifier of the PNI-NPN in the home network.

The difference between the first registration request and the second registration request is that the NSSAI in the first registration request is a set consisting of one or more S-NSSAI, which may include other networks in addition to S-NSSAI#1 Fragmentation selection auxiliary information; the NSSAI in the second registration request only carries S-NSSAI#1, does not contain other network fragmentation selection auxiliary information, and S-NSSAI#1 is marked as "applied to PNI-NPN", and where Contains the network identifier of the PNI-NPN in the home network. When the first AMF receives the second registration request, it can determine that it is different from the first registration request according to these characteristics of the second registration request, so as to allocate the second auxiliary information S-NSSAI#2 and related resources for the second request, and send S - notifying the first UE of the mapping relationship between NSSAI#1 and S-NSSAI#2.

With this method, the user equipment only needs to slightly adjust the software processing flow in the existing implementation mode, without adding new hardware devices or greatly modifying the processing logic, and there is no problem of compatibility between the old and new versions, which is convenient for the existing network. implement.

Further, as shown in FIG. 2, the communication method further includes:

Step S130, when the first auxiliary information is permitted in the roaming network, in response to receiving the second auxiliary information replied by the first AMF, and the second auxiliary information and the first auxiliary information The mapping relationship is connected to the network resources of the first network in the home network.

If the first UE sends the first registration request carrying S-NSSAI#1, the AMF directly replies with S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1, indicating that there have been other The user equipment has sent the second registration request and the registration is successful. At this time, the first UE can directly use the allocated dedicated resources to connect to the network resources of the home network PNI-NPN without performing the registration step again. It solves the problem that when multiple users need to connect to the same PNI-NPN at the same time, they still need to establish their own tunnels, resulting in low resource usage efficiency.

It should be pointed out that the first UE mentioned in this document does not mean that only the UE can send the first registration request and the second registration request, but only represents a UE role, and the UE role will perform corresponding steps. As long as any UE has the characteristics of the first UE mentioned in this document, it can take the role of the first UE when performing the corresponding steps.

In a second aspect, an embodiment of the present disclosure provides a communication method for a first AMF, as shown in FIG. 3 , the method includes:

Step S210, in response to receiving a second registration request, send a query to the home network, wherein the second registration request is the second registration sent by the first UE in any one of the communication methods in the first aspect request, where the second registration request carries the first auxiliary information and the first network information;

Step S220, in the query result, if the first auxiliary information of the first UE belongs to the home network, and there is a service corresponding to the first network in the home network, then it is the The first UE allocates second auxiliary information;

Step S230. Notify the first UE of the second auxiliary information and a mapping relationship between the second auxiliary information and the first auxiliary information.

As mentioned above, based on the difference between the first registration request and the second registration request, the first AMF can determine whether it is currently receiving the first registration request or the second registration request. When the first AMF receives the second registration request, it first needs to confirm to the home network whether the first auxiliary information S-NSSAI#1 carried in the second registration request applies to the PNI-NPN in the home network, and Whether the user equipment sending the second registration request has subscribed to the corresponding PNI-NPN network service, or whether it has the right to connect to the corresponding PNI-NPN.

If the S-NSSAI#1 provided by the user equipment is applied to the PNI-NPN in the home network, and the UE has subscribed to the corresponding PNI-NPN network service, it means that the first AMF in the roaming network can establish a mapping for the auxiliary information and Allocate relevant resources. The first AMF will assign a second auxiliary information S-NSSAI#2 in the roaming network to the user, establish a mapping relationship between S-NSSAI#2 and S-NSSAI#1, and assign S-NSSAI#2 and S-NSSAI#2 The mapping relationship between #2 and S-NSSAI#1 is notified to the UE.

In some embodiments, as shown in FIG. 4, the step S210 specifically includes:

Step S211. According to the first auxiliary information in the second registration request, instruct the first network segment selection function entity NSSF in the roaming network to query the second NSSF in the home network for the first Whether the UE belongs to the home network;

Step S212: According to the first auxiliary information in the second registration request, instruct the unified data management function entity UMD in the roaming network to query the UMD in the home network whether the first UE exists in the home network. The service corresponding to the first network information.

The first AMF instructs the network slice selection function entity (NSSF, Network SliceSelection Function) in the roaming network to query the NSSF in the home network whether the S-NSSAI#1 provided by the user equipment is applied to the PNI-NPN in the home network . At the same time, the first AMF will also instruct the unified data management function entity (UDM, Unified Data Management) in the roaming network to query the UDM in the home network whether the user equipment has subscribed to the corresponding PNI-NPN network service, or whether there is PNI-NPN corresponding to the authority connection. If the S-NSSAI#1 provided by the user equipment is applied to the PNI-NPN in the home network, and the UE has subscribed to the corresponding PNI-NPN network service, it means that the first AMF in the roaming network can establish a mapping for the auxiliary information and Allocate relevant resources.

In some embodiments, as shown in FIG. 5, the step S220 specifically includes:

Step S221, establishing a mapping relationship between the second auxiliary information and the first auxiliary information;

Step S222, allocating corresponding network resources for the second auxiliary information, including the AMF, the session management function entity SMF, and the user plane function entity UPF in the roaming network carrying the network connection of the user equipment to the first network.

The first AMF in the roaming network not only establishes the mapping relationship between S-NSSAI#2 and S-NSSAI#1, but also allocates the relevant necessary network resources, not only realizes the connection from the forwarding layer, but also realizes the unification from the control layer Management, which solves the problem that the roaming network is invisible to bearer services after the user equipment is connected to the home network, and facilitates the roaming network to provide corresponding quality of service guarantees for this.

In some embodiments, after the step S230, it also includes:

Notifying the user equipment of the second auxiliary information and the mapping relationship between the second auxiliary information and the first auxiliary information in response to receiving the first registration request from the user equipment, where the first registration request carries The first auxiliary information is dedicated to the home network.

If the first AMF directly replies with S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1 when the user equipment sends the first registration request carrying S-NSSAI#1, it indicates that there has been Other user equipments have sent the second registration request and the registration is successful. At this time, the user equipment can directly use the allocated dedicated resources to connect to the network resources of the home network PNI-NPN without performing the registration step again. It solves the problem that when multiple users need to connect to the same PNI-NPN at the same time, they still need to establish their own tunnels, resulting in low resource usage efficiency.

In some embodiments, after the step S230, it also includes:

When all user equipments using the second auxiliary information leave the coverage area of the roaming network, release the network resources corresponding to the second auxiliary information.

After the user equipment sends out the second registration application carrying S-NSSAI#1 for the first time, it applies for a dedicated resource from the AMF of the roaming network. usage rate.

However, as more and more user equipment applications are made, the occupation of dedicated resources will also increase accordingly, and even resources shared by multiple user equipment cannot be permanently reserved. Therefore, resources temporarily not used by the user equipment need to be recovered in time.

In the embodiment of the present disclosure, after the user equipment using S-NSSAI#2 leaves the coverage area of the roaming network, whether there are other user equipments using the resource, that is, when the last user equipment using S-NSSAI#2 After the device leaves the coverage area of the wireless access network assigned S-NSSAI#2, the first AMF will reclaim the resources related to S-NSSAI#2, revoke the value of S-NSSAI#2 and its mapping relationship with S-NSSAI#1 .

After the first AMF cancels the value of S-NSSAI#2, if the user equipment carries S-NSSAI#1 in the first registration request again, the user equipment and the first AMF need to obtain the first registration request, the second The registration request starts to re-execute the application steps.

In a third aspect, an embodiment of the present disclosure provides a UE. As shown in FIG. 6 , the UE includes:

The first registration module 310 is configured to initiate a first registration request to the first AMF of the roaming network, where the first registration request carries first auxiliary information dedicated to the home network;

The second registration module 320 is configured to initiate a second registration request to the first AMF when the first auxiliary information and its mapping value in the roaming network are not permitted, the second registration request carry the first auxiliary information and first network information, so that the first AMF allocates mapping values and network resources to the first auxiliary information according to the first auxiliary information;

Wherein, the first auxiliary information includes the single network slice selection auxiliary information S-NSSAI subscribed in the home network, and the first network information includes the network identifier of the first network in the home network .

In order to connect to the home PNI-NPN network, the first UE in the roaming network first uses the network slice selection auxiliary information carrying the first auxiliary information S-NSSAI#1 to the roaming network through the first registration module 310 The first AMF initiates a first registration request. The first AMF returns the NSSAI allowed to be used by the user equipment to the first UE. If the NSSAI returned by the first AMF does not contain the S-NSSAI#1 requested by the first UE, the second registration module 320 of the first UE will immediately initiate the first AMF to the first AMF with the NSSAI that only carries S-NSSAI#1. 2. A registration request, and mark S-NSSAI#1 as "applied to PNI-NPN", and include the network identifier of the PNI-NPN in the home network.

The difference between the first registration request and the second registration request is that the NSSAI in the first registration request is a set, and in addition to S-NSSAI#1, may also contain other network slice selection auxiliary information; the second registration request In the NSSAI, only S-NSSAI#1 is carried, and other network fragment selection auxiliary information is not included, and S-NSSAI#1 is marked as "applied to PNI-NPN", and it contains PNI-NPN in the home network Network ID. When the first AMF receives the second registration request, it can determine that it is different from the first registration request according to these characteristics of the second registration request, so as to allocate the second auxiliary information S-NSSAI#2 and related resources for the second request, and send S - notifying the first UE of the mapping relationship between NSSAI#1 and S-NSSAI#2.

With this method, the user equipment only needs to slightly adjust the software processing flow in the existing implementation mode, without adding new hardware devices or greatly modifying the processing logic, and there is no problem of compatibility between the old and new versions, which is convenient for the existing network. implement.

Further, as shown in FIG. 7, the UE further includes:

The resource acquisition module 330, when the first auxiliary information is permitted in the roaming network, responds to receiving the second auxiliary information replied by the AMF, and the second auxiliary information and the first auxiliary information The mapping relationship is connected to the network resources of the first network in the home network.

If the first AMF directly replies with S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1 when the user equipment sends the first registration request carrying S-NSSAI#1, it indicates that there has been Other user equipments have sent the second registration request and the registration is successful. At this time, the user equipment can directly use the allocated dedicated resources to connect to the network resources of the home network PNI-NPN through the resource acquisition module 330, without performing the registration step again. It solves the problem that when multiple users need to connect to the same PNI-NPN at the same time, they still need to establish their own tunnels, resulting in low resource usage efficiency.

In a fourth aspect, an embodiment of the present disclosure provides an AMF. As shown in FIG. 8 , the AMF includes:

The registration home query module 410 is configured to send a query to the home network in response to receiving a second registration request, wherein the second registration request is sent by the first UE in any one of the communication methods in the first aspect A second registration request, where the second registration request carries the first auxiliary information and the first network information;

The auxiliary information allocation module 420 is configured to, in the query result, if the first auxiliary information of the first UE belongs to the home network, and there is a network corresponding to the first network in the home network service, assigning second assistance information to the first UE;

The auxiliary information notifying module 430 is configured to notify the first UE of the second auxiliary information and a mapping relationship between the second auxiliary information and the first auxiliary information.

Based on the difference between the first registration request and the second registration request, the first AMF can determine whether the currently received first registration request or the second registration request is received. When the first AMF receives the second registration request, first, the registration attribution query module 410 and the auxiliary information distribution module 420 confirm to the home network whether the first auxiliary information S-NSSAI#1 carried in the second registration request applies The PNI-NPN in the home network, and whether the user equipment sending the second registration request has subscribed to the corresponding PNI-NPN network service, or whether it has the right to connect to the corresponding PNI-NPN.

If the S-NSSAI#1 provided by the user equipment is applied to the PNI-NPN in the home network, and the UE has subscribed to the corresponding PNI-NPN network service, it means that the first AMF in the roaming network can establish a mapping for the auxiliary information and Allocate relevant resources. The first AMF will assign a second auxiliary information S-NSSAI#2 in the roaming network to the user, establish a mapping relationship between S-NSSAI#2 and S-NSSAI#1, and send the S-NSSAI#2 through the auxiliary information notification module 430 #2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1 are notified to the UE.

In some embodiments, as shown in FIG. 9, the registration attribution query module 410 includes:

The NSSF query submodule 411 is configured to, according to the first auxiliary information in the second registration request, instruct the first network slice selection function entity NSSF in the roaming network to send the second NSSF in the home network Query whether the first UE belongs to the home network;

The UMD query submodule 412 is configured for the user to instruct the unified data management function entity UMD in the roaming network to query the UMD in the home network for the first UE according to the first auxiliary information in the second registration request Whether there is a service corresponding to the first network information in the home network.

The first AMF instructs the NSSF in the roaming network to query the NSSF in the home network through the NSSF query submodule 411 whether the S-NSSAI#1 provided by the user equipment is applicable to the PNI-NPN in the home network. At the same time, the first AMF will also instruct the UDM in the roaming network to query the UDM in the home network through the UMD query sub-module 412 whether the user equipment has subscribed to the corresponding PNI-NPN network service, or whether it has the right to connect to the corresponding PNI -NPN. If the S-NSSAI#1 provided by the user equipment is applied to the PNI-NPN in the home network, and the UE has subscribed to the corresponding PNI-NPN network service, it means that the first AMF in the roaming network can establish a mapping for the auxiliary information and Allocate relevant resources.

In some embodiments, as shown in FIG. 10, the auxiliary information allocation module 420 includes:

An auxiliary information mapping submodule 421, configured to establish a mapping relationship between the second auxiliary information and the first auxiliary information;

The resource allocation submodule 422 is configured to allocate corresponding network resources for the second auxiliary information, including the AMF, the session management function entity SMF, and the user plane function entity UPF in the roaming network. Internet connection.

The first AMF in the roaming network not only establishes the mapping relationship between S-NSSAI#2 and S-NSSAI#1 through the auxiliary information mapping submodule 421, but also allocates relevant necessary network resources through the resource allocation submodule 422, Not only the connection is realized from the forwarding level, but also the unified management is realized from the control level, which solves the problem that the roaming network is invisible to the bearer service after the user equipment is connected to the home network, and facilitates the roaming network to provide corresponding quality of service guarantee for this.

In some embodiments, the auxiliary information notification module 430 is further configured to send the second auxiliary information, and the second auxiliary information and the first auxiliary information to the resource in response to receiving the first registration request of the user equipment. Notify the mapping relationship to the user equipment, wherein the first registration request carries the first auxiliary information dedicated to the home network.

If the user equipment sends the first registration request carrying S-NSSAI#1, the first AMF directly replies S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1 through the auxiliary information notification module 430, It indicates that other user equipments have sent the second registration request before and the registration is successful. At this time, the user equipment can directly use the allocated dedicated resources to connect to the network resources of the home network PNI-NPN without performing the registration step again. It solves the problem that when multiple users need to connect to the same PNI-NPN at the same time, they still need to establish their own tunnels, resulting in low resource usage efficiency.

Further, the AMF also includes:

The resource recycling module 440 is configured to release network resources corresponding to the second auxiliary information when all user equipments using the second auxiliary information leave the coverage area of the roaming network.

After the user equipment sends out the second registration application carrying S-NSSAI#1 for the first time, it applies for a dedicated resource from the AMF of the roaming network. usage rate.

However, as more and more user equipment applications are made, the occupation of dedicated resources will also increase accordingly, and even resources shared by multiple user equipment cannot be permanently reserved. Therefore, resources temporarily not used by the user equipment need to be recovered in time.

In the embodiment of the present disclosure, the resource recovery module 440 judges whether there are other user equipments using the resources after the user equipment using S-NSSAI#2 leaves the coverage area of the roaming network, that is, when the last user equipment using S-NSSAI After user equipment #2 leaves the coverage area of the radio access network assigned S-NSSAI#2, the first AMF will reclaim the resources related to S-NSSAI#2, revoke the value of S-NSSAI#2 and its relationship with S-NSSAI# 1 mapping relationship.

After the first AMF cancels the value of S-NSSAI#2, if the user equipment carries S-NSSAI#1 in the first registration request again, the user equipment and the first AMF need to obtain the first registration request, the second The registration request starts to re-execute the application steps.

In a fifth aspect, an embodiment of the present disclosure provides a communication system, where the communication system includes a first UE and a first AMF, wherein,

The first UE corresponding to the first UE is the first UE in any one of the communication methods in the first aspect;

The first AMF corresponding to the first AMF is the first AMF in any one of the communication methods in the second aspect.

The first AMF is also used for:

If the first auxiliary information carried in the first registration request sent by the first UE has been allowed in the roaming network, reply the second auxiliary information to the first UE, and the second auxiliary information and the The mapping relationship of the first auxiliary information is used to enable the first UE to connect to the network resources of the first network in the home network.

Further, the communication system further includes: a first network segment selection function entity NSSF of the roaming network, a first unified data management function entity UMD of the roaming network, a second NSSF of the home network, and a second NSSF of the home network Two UMDs;

The first AMF is further configured to: after receiving the second registration request from the first UE, according to the first auxiliary information carried in the second registration request, instruct the first NSSF to query the second NSSF for the Whether the first UE belongs to the home network, instructing the first UMD to query the second UMD whether the first UE exists in the home network corresponding to the first network information services;

determining whether to allocate second auxiliary information according to a query result of the first NSSF and the first UMD.

The communication system provided by the fifth aspect of the present disclosure will be described below in conjunction with a specific embodiment.

Fig. 12 is a sequence diagram of connecting to a PNI-NPN carried by a home network in a roaming state provided by an embodiment of the present disclosure. As shown in Figure 12, the steps are as follows:

Step S501 , when the first UE initiates a first registration request to the roaming network while roaming, the first registration request carries the S-NSSAI#1 dedicated to PNI-NPN assigned to it in the home network.

Step S502 , the NSSAI allowed to be used by the UE returned by the first AMF of the roaming network to the first UE does not include the S-NSSAI#1 requested by the UE.

Step S503, when the first UE recognizes that it is currently in a roaming network and the NSSAI received from the first AMF of the roaming network does not contain the requested S-NSSAI#1 when requesting registration, then immediately re-initiate the second registration ask. The NSSAI in the second registration request includes only S-NSSAI#1, and S-NSSAI#1 is marked as "applied to PNI-NPN", and includes the network identifier of the PNI-NPN in the home network.

Step S504, the first AMF instructs the NSSF _r in the roaming network to query the NSSF _h in the home network whether the S-NSSAI#1 provided by the first UE is applicable to the PNI-NPN in the home network.

Step S505, the first AMF instructs UDM _r in the roaming network to query UDM _h in the home network whether the first UE has subscribed to the corresponding PNI-NPN network service (or whether it is authorized to connect to the corresponding PNI-NPN).

Step S506, if the S-NSSAI#1 provided by the first UE is applied to the PNI-NPN in the home network, and the first UE subscribes to the corresponding PNI-NPN network service, the first AMF allocates a roaming location for the first UE S-NSSAI#2 in the network establishes a mapping relationship between S-NSSAI#2 and S-NSSAI#1.

Step S507, the first AMF returns S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1 to the first UE.

Step S508, the first AMF allocates corresponding network resources for S-NSSAI#2: at least AMFr, SMFr, and UPFr bear the UE's network connection to the PNI-NPN.

Step S509, when there are other UEs in the coverage area of the wireless access network to which S-NSSAI#2 has been allocated, S-NSSAI#1 is carried in the first registration request, the first AMF directly includes in the NSSAI returned to it S-NSSAI#2 and the mapping relationship between S-NSSAI#2 and S-NSSAI#1.

Step S510, when the last UE using S-NSSAI#2 leaves the coverage area of the wireless access network allocated with S-NSSAI#2, the first AMF revokes the value of S-NSSAI#2. That is, when the UE carrying S-NSSAI#1 in the first registration request appears again later, it needs to start from step S501.

The communication method provided by the embodiments of the present disclosure initiates registration with the first AMF in the roaming network according to the first auxiliary information that the first UE has registered in the home location, and the first AMF allocates the second auxiliary information and related resources, and establishes the first AMF. The mapping relationship between the first auxiliary information and the second auxiliary information, when other UEs subsequently apply for registration with the first AMF based on the first auxiliary information, they can directly use the established mapping relationship and related resources, which not only solves the problem that the user equipment connects to the home The problem that the roaming network is invisible to bearer services after the local network is used, which is convenient for the roaming network to provide corresponding quality of service guarantees; and solves the problem that when multiple users need to connect to the same PNI-NPN at the same time, they still need to establish their own Inefficient use of resources caused by tunneling.

It can be understood that, the above implementations are only exemplary implementations adopted to illustrate the principle of the present disclosure, but the present disclosure is not limited thereto. For those skilled in the art, without departing from the spirit and essence of the present disclosure, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present disclosure.

Claims (10)

1. A communication method applied to a first user equipment UE, the communication method comprising:

initiating a first registration request to a first Access Management Function (AMF) of a roaming place network, wherein the first registration request carries first auxiliary information special for a home place network;

when the first auxiliary information and the mapping value thereof in the roaming network are not licensed, initiating a second registration request to the first AMF, wherein the second registration request carries the first auxiliary information and first network information so that the first AMF can allocate the mapping value and network resources to the first auxiliary information according to the first auxiliary information;

wherein the first assistance information includes single network fragment selection assistance information S-nsai that has been subscribed in the home network, the first network information including a network identification of a first network in the home network;

and when the first auxiliary information is licensed in the roaming area network, connecting to network resources of the first network in the home network in response to receiving second auxiliary information replied by the first AMF and the mapping relation between the second auxiliary information and the first auxiliary information.

2. A communication method applied to a first access management function entity AMF, the communication method comprising:

responding to a second registration request, and sending a query request to a home network, wherein the second registration request is a second registration request sent by a first User Equipment (UE) in the communication method of claim 1, and the second registration request carries first auxiliary information and first network information so that the first AMF can allocate a mapping value and network resources to the first auxiliary information according to the first auxiliary information; the second registration request is that the first user equipment UE initiates a first registration request to a first access management function entity AMF of a roaming place network, and is sent when the first auxiliary information and a mapping value thereof in the roaming place network are not licensed, wherein the first auxiliary information comprises single network fragment selection auxiliary information S-NSSAI subscribed in the home place network, and the first network information comprises a network identifier of a first network in the home place network; when the first auxiliary information is licensed in the roaming network, responding to the second auxiliary information received by the first AMF reply and the mapping relation between the second auxiliary information and the first auxiliary information, and connecting to network resources of the first network in the home network;

The query request includes querying whether the first UE is affiliated with the home network, and querying whether the first UE has a service corresponding to the first network information in the home network;

in the query result, if the first auxiliary information of the first UE belongs to a home network and a service corresponding to the first network exists in the home network, distributing second auxiliary information for the first UE;

and advertising the second auxiliary information and the mapping relation between the second auxiliary information and the first auxiliary information to the first UE.

3. The communication method of claim 2, wherein the allocating the second assistance information to the first UE comprises:

establishing a mapping relation between the second auxiliary information and the first auxiliary information;

and allocating corresponding network resources for the second auxiliary information, wherein the network resources comprise AMF in the roaming place network, a session management function entity SMF and a user plane function entity UPF for bearing network connection of user equipment to the first network.

4. A communication method according to any one of claims 2 to 3, wherein after the advertising of the second assistance information and the mapping relationship of the second assistance information and the first assistance information to the first UE, further comprising:

And when all the user equipment using the second auxiliary information leave the coverage area of the roaming area network, releasing the network resources corresponding to the second auxiliary information.

5. A user equipment, UE, for a first UE, the UE comprising:

a first registration module, configured to initiate a first registration request to a first access management function entity AMF of a roaming place network, where the first registration request carries first auxiliary information dedicated to a home place network;

a second registration module, configured to initiate a second registration request to the first AMF when the first auxiliary information and a mapping value thereof in the roaming network are not licensed, where the second registration request carries the first auxiliary information and first network information, so that the first AMF allocates a mapping value and network resources to the first auxiliary information according to the first auxiliary information;

wherein the first assistance information includes single network fragment selection assistance information S-nsai that has been subscribed in the home network, the first network information including a network identification of a first network in the home network;

and when the first auxiliary information is licensed in the roaming area network, connecting to network resources of the first network in the home network in response to receiving second auxiliary information replied by the first AMF and the mapping relation between the second auxiliary information and the first auxiliary information.

6. An access management function entity, AMF, for a first AMF, the AMF comprising:

a registration home query module, configured to send a query to a home network in response to receiving a second registration request, where the second registration request is a second registration request sent by a first user equipment UE in the communication method of claim 1, and the second registration request carries first auxiliary information and first network information; the first AMF allocates a mapping value and network resources to the first auxiliary information according to the first auxiliary information; the second registration request is that the first user equipment UE initiates a first registration request to a first access management function entity AMF of a roaming place network, and is sent when the first auxiliary information and a mapping value thereof in the roaming place network are not licensed, wherein the first auxiliary information comprises single network fragment selection auxiliary information S-NSSAI subscribed in the home place network, and the first network information comprises a network identifier of a first network in the home place network; when the first auxiliary information is licensed in the roaming network, responding to the second auxiliary information received by the first AMF reply and the mapping relation between the second auxiliary information and the first auxiliary information, and connecting to network resources of the first network in the home network;

The auxiliary information distribution module is used for distributing second auxiliary information to the first UE if the first auxiliary information of the first UE belongs to a home network and a service corresponding to the first network exists in the home network in a query result;

and the auxiliary information notification module is used for notifying the second auxiliary information and the mapping relation between the second auxiliary information and the first auxiliary information to the first UE.

7. The AMF of claim 6, wherein the auxiliary information allocation module comprises:

an auxiliary information mapping sub-module, configured to establish a mapping relationship between the second auxiliary information and the first auxiliary information;

and the resource allocation sub-module is used for allocating corresponding network resources for the second auxiliary information, and comprises AMF in the roaming area network, a session management function entity SMF and a user plane function entity UPF for bearing network connection of user equipment to the first network.

8. The AMF of any one of claims 6-7, wherein said AMF further comprises:

and the resource recovery module is used for releasing the network resource corresponding to the second auxiliary information after all the user equipment using the second auxiliary information leave the coverage area of the roaming area network.

9. A communication system comprising a first user equipment, UE, a first access management function, AMF, characterized in that,

the first UE is a first UE in the communication method of claim 1;

the first AMF is the first AMF in the communication method according to any one of claims 2 to 4;

the first AMF is further configured to:

if the first auxiliary information carried in the first registration request sent by the first UE is licensed in the roaming network, the second auxiliary information and the mapping relation between the second auxiliary information and the first auxiliary information are returned to the first UE, so that the first UE is connected to the network resource of the first network in the home network.

10. The communication system according to claim 9, wherein the communication system further comprises: a first network fragment selection function entity NSSF of the roaming place network, a first unified data management function entity UMD of the roaming place network, a second NSSF of the home place network and a second UMD of the home place network;

the first AMF is further configured to: after receiving a second registration request of a first UE, according to first auxiliary information carried in the second registration request, indicating the first NSSF to inquire whether the first UE belongs to the home network from the second NSSF, and indicating the first UMD to inquire whether a service corresponding to the first network information exists in the home network from the second UMD;

And determining whether to distribute second auxiliary information according to the query results of the first NSSF and the first UMD.

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