CN114599067A - Control method and device for network reselection and storage medium - Google Patents
Control method and device for network reselection and storage medium Download PDFInfo
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- H—ELECTRICITY
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The present disclosure provides a control method, apparatus and storage medium for network reselection, wherein the method comprises: an access control network element of a first system receives a registration request message sent by a terminal; an access control network element of a first system acquires network access information in a registration request message, and determines whether the first system and a second system belong to the same operator or not based on the network access information; and if the first system and the second system do not belong to the same operator, the access control network element of the first system sends a registration rejection message to the terminal so that the terminal starts initial registration processing in the first system. The method and the device can improve the effectiveness of cross-network reselection among different network roaming operators; based on the network identification and the registration information of the access user, the user can be effectively indicated to access quickly, and the mechanism is more flexible; the operation flow of cross-network reselection under the different-network roaming environment is optimized, the cross-network roaming user is controlled and guided to quickly complete network access, and the use experience of the user is improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a control method and apparatus for network reselection, and a storage medium.
Background
In a standard 4G and 5G interoperation process, a target side network element queries an original side network according to a User Equipment (UE) GUTI (global uniform temporal Identity UE Identity) to acquire context information. At present, in the deployment process of the 5G 700M core network heterogeneous roaming, an interoperation interface between a 4G (4th-Generation, fourth Generation mobile communication technology) system and a 5G (5th-Generation, fifth Generation mobile communication technology) system is not opened between operators, and when a user moves from a shared network 5G system to a coverage area of a home network 4G system, or from a home network 4G network to a shared network 5G, a network reselection process is started, a DNS query flow is triggered, whether an address of a visited AMF (Access and Mobility Management Function) or an MME (Mobility Management Entity) can be checked, so as to obtain information such as a context of the user; however, the failure of the N26 link across operators may cause timeout failure, extend the time for rejecting the user, and when the user roams in the areas of the shared network 5G system and the home network 4G system, the access time is equivalent to international roaming, which results in poor user experience and high consumption of interface resources across operators.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a control method, apparatus and storage medium for network reselection.
According to a first aspect of the present disclosure, there is provided a control method for network reselection, comprising: an access control network element of a first system receives a registration request message sent by a terminal; wherein the registration request message is sent when the terminal moves from a second system to the first system; the access control network element of the first system acquires network access information in the registration request message, and determines whether the first system and the second system belong to the same operator based on the network access information; and if the first system and the second system do not belong to the same operator, the access control network element of the first system sends a registration rejection message to the terminal so that the terminal starts initial registration processing in the first system.
Optionally, if the first system and the second system belong to the same operator, the access control network element of the first system acquires address information of the access control network element of the second system; and the access control network element of the first system acquires context information corresponding to the terminal from the access control network element of the second system based on the address information so as to perform access processing on the terminal.
Optionally, the first system is a 4G system and the second system is a 5G system, or the first system is a 5G system and the second system is a 4G system.
Optionally, when the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME, and the access control network element of the second system is an AMF.
Optionally, the registration request message includes: a TAU request message; the registration rejection message includes: a TAU reject message; the receiving, by the access control network element of the first system, the registration request message sent by the terminal includes: the MME receives the TAU request message sent by the terminal; the sending, by the access control network element of the first system, the registration rejection message to the terminal includes: and the MME sends the TAU reject message to the terminal.
Optionally, the obtaining, by the access control network element of the first system, the context information corresponding to the terminal from the access control network element of the second system based on the address information includes: the MME obtains context information corresponding to the terminal from the AMF through an N26 interface based on the address information.
Optionally, when the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is an AMF, and the access control network element of the second system is an MME.
Optionally, the registration request message includes: a registration request message; the registration rejection message includes: registration request message; the receiving, by the access control network element of the first system, the registration request message sent by the terminal includes: the AMF receives the registration request message sent by the terminal; the sending, by the access control network element of the first system, the registration rejection message to the terminal includes: and the AMF sends the registration reject message to the terminal.
Optionally, the obtaining, by the access control network element of the first system, the context information corresponding to the terminal from the access control network element of the second system based on the address information includes: the AMF acquires context information corresponding to the terminal from the MME through an N26 interface based on the address information.
Optionally, the network access information includes: MCC and MNC information in GUIT.
According to a second aspect of the present disclosure, there is provided a control apparatus for network reselection, comprising: an access control network element of a first system, configured to receive a registration request message sent by a terminal; wherein the registration request message is sent when the terminal moves from a second system to the first system; acquiring network access information in the registration request message, and determining whether the first system and the second system belong to the same operator based on the network access information; and if the first system and the second system do not belong to the same operator, sending a registration rejection message to the terminal so that the terminal starts initial registration processing in the first system.
Optionally, the method further comprises: an access control network element of a second system; the access control network element of the first system is configured to acquire address information of the access control network element of the second system if the first system and the second system belong to the same operator; and acquiring context information corresponding to the terminal from an access control network element of the second system based on the address information so as to perform access processing on the terminal.
Optionally, the first system is a 4G system, and the second system is a 5G system, or the first system is a 5G system, and the second system is a 4G system.
Optionally, when the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME, and the access control network element of the second system is an AMF.
Optionally, the registration request message includes: a TAU request message; the registration rejection message includes: a TAU reject message; the MME is configured to receive the TAU request message sent by the terminal and send the TAU reject message to the terminal.
Optionally, the MME is configured to obtain context information corresponding to the terminal from the AMF through an N26 interface based on the address information.
Optionally, when the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is an AMF, and the access control network element of the second system is an MME.
Optionally, the registration request message includes: a registration request message; the registration rejection message includes: registration request message; the AMF is configured to receive the registration request message sent by the terminal and send the registration request message to the terminal.
Optionally, the AMF is configured to obtain context information corresponding to the terminal from the MME through an N26 interface based on the address information
According to a third aspect of the present disclosure, there is provided a computer readable storage medium storing computer instructions for execution by a processor to perform the method as described above.
The control method, the control device and the storage medium for network reselection can improve the effectiveness of cross-network reselection among different network roaming operators; based on the network identification and the registration information of the access user, the user can be effectively indicated to access quickly, and the mechanism is more flexible; the operation flow of cross-network reselection under the different-network roaming environment is optimized, the cross-network roaming user is controlled and guided to quickly complete network access, and the use experience of the user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.
Fig. 1 is a schematic flow chart diagram illustrating one embodiment of a control method for network reselection in accordance with the present disclosure;
fig. 2 is a schematic flow chart diagram illustrating another embodiment of a control method for network reselection according to the present disclosure;
fig. 3 is a control flow diagram of a terminal moving from a shared 5G network to a 4G network in an embodiment of a control method for network reselection according to the present disclosure;
fig. 4 is a schematic diagram of signaling processing of a terminal moving from a shared 5G network to a 4G network in an embodiment of a control method for network reselection according to the present disclosure;
fig. 5 is a schematic control flow diagram of a terminal moving from a home 4G network to a shared 5G network in an embodiment of the control method for network reselection according to the present disclosure;
fig. 6 is a schematic diagram of signaling processing of a terminal moving from a home 4G network to a shared 5G network in an embodiment of the control method for network reselection according to the present disclosure;
fig. 7 is a block diagram of an embodiment of a control device for network reselection according to the present disclosure.
Detailed Description
The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. 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 terms "first", "second", and the like are used hereinafter only for descriptive distinction and have no other special meaning.
Under the current 4G system/5G system interoperation architecture, the prior art cannot realize effective guidance of a roaming user in 4G and 5G network reselection, the network tries to acquire user context information through query, and the network reselection can be continued after the query fails, so that the user access time is long, the experience is poor, and network resources are inefficiently consumed.
Fig. 1 is a flowchart illustrating a control method for network reselection according to an embodiment of the present disclosure, as shown in fig. 1:
In one embodiment, the terminal may be a UE or the like, and the UE includes a mobile phone, a tablet computer, a notebook computer or the like. The first system is a 4G system, the second system is a 5G system, or the first system is a 5G system, and the second system is a 4G system.
In one embodiment, the network access information in the registration request message includes MCC and MNC information in GUIT, etc. The GUTI is a temporary identifier of the user and provides an identity identifier for the terminal. The information carried by the GUTI includes MCC (Mobile Country Code), MNC (Mobile Network Code), and the like.
Fig. 2 is a flowchart illustrating a control method for network reselection according to another embodiment of the present disclosure, as shown in fig. 2:
In one embodiment, in the case that the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME and the access control network element of the second system is an AMF. And if the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is AMF and the access control network element of the second system is MME.
In step 204, the access control network element of the first system obtains context information corresponding to the terminal from the access control network element of the second system based on the address information, so as to perform access processing on the terminal. The access control network element of the first system may perform access processing on the terminal using an existing method.
In one embodiment, when the 5G network and the 4G network belong to the same operator, an N26 interface is added between the AMF in the 5G network and the MME in the 4G network, and communication between the MME and the AMF network element is realized through an N26 interface. When the 5G network and the 4G network belong to different operators, there is no N26 interface between the AMF in the 5G network and the MME in the 4G network.
When the 5G network and the 4G network belong to the same operator, the terminal re-accesses the 4G network from the 5G network, the MME performs signaling interaction with a DNS (Domain Name System) System to acquire the address information of the AMF, and acquires the 4G context converted from the 5G context of the terminal from the AMF network element according to the address information of the AMF network element.
When the terminal re-accesses the 5G network from the 4G network, the AMF network element performs signaling exchange with a DNS (Domain Name System) System to acquire the address information of the MME, and acquires the 4G context of the terminal from the MME through signaling interaction according to the address information of the MME.
In one embodiment, the registration request message includes a TAU (Tracking Area Update) request message or the like, and the registration reject message includes a TAU reject message or the like. Fig. 3 is a schematic control flow diagram of a terminal moving from a shared 5G network to a 4G network in an embodiment of the control method for network reselection according to the present disclosure, as shown in fig. 3:
in step 301, the terminal moves from the shared 5G network to the home 4G network at the 4G, 5G network boundary.
In step 303, after receiving the TAU request message sent by the terminal, the MME determines, according to the MCC and MNC information in the GUTI, whether the last access network of the user belongs to the same operator as the 4G network, if so (that is, the 5G network is the home network of the terminal), then the MME enters step 304, and if not (that is, the 5G network is the shared network of another operator), then the MME enters step 305.
By adding the judgment operation of the 4G TAU registration information to the MME and distinguishing roaming reselection and home network reselection according to the user access information, the service access experience of the roaming user is ensured. If the access information carried by the registration request sent by the terminal indicates that the terminal is accessed from a different network, the existing process of acquiring access context information across networks is not continued, and the initial registration is directly started.
For example, China Mobile is used as a visiting network side to provide the heterogeneous network roaming service for China telecom. When the China telecom 4G network receives a return access request from a user roaming out of the local network, the user needs to judge that the previous network is China mobile according to access information carried by the user, so that the user is not required to request context information across networks any more, and the user is directly required to register again.
Fig. 4 is a schematic diagram of signaling processing of a terminal moving from a shared 5G network to a 4G network in an embodiment of the control method for network reselection according to the present disclosure, as shown in fig. 4:
in step 400, the UE starts TAU trigger.
Step 401, the UE sends a TAU request message.
Step 402, the eNB sends a TAU request message, where the TAU request message carries a GUTI.
In step 403, the MME determines whether the UE is mobile accessed from the shared network, and if so (i.e. the 5G shared network and the home 4G network belong to different operators), the MME proceeds to step 404, and if not, the MME proceeds to step 407.
In step 404, the MME sends a TAU reject message.
In step 405, the UE sends an Attach request message.
Step 406, the UE performs a normal initial registration procedure. The UE terminal may use the existing method for a normal initial registration procedure.
Step 407, the UE terminal performs a normal N26 interoperation procedure. The UE terminal may perform the normal N26 interworking procedure using existing methods.
When the MME judges that the network accessed by the user last time is a different operator network, the MME does not start the cross-network signaling inquiry process any more, directly refuses TAU registration of the user, and starts initial registration; and when the MME judges that the network accessed by the user last time is the same operator network, the original flow is kept for the interoperation of the users in the same network.
In one embodiment, in the case that the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is an AMF, and the access control network element of the second system is an MME. The registration request message includes a registration request message and the like; the registration reject message includes a registration reject message and the like.
And performing function enhancement on the existing AMF, and if the access information carried by the UE request indicates that the UE is accessed from a different network, directly starting initial registration without continuing the existing process of acquiring access context information across networks. Fig. 5 is a schematic control flow diagram of a terminal moving from a home 4G network to a shared 5G network in an embodiment of the control method for network reselection according to the present disclosure, as shown in fig. 5:
in step 501, the terminal moves from the home 4G network to the shared 5G network at the boundary between the 4G network and the 5G network.
For example, China Mobile is used as a visiting network side to provide the heterogeneous network roaming service for China telecom. After the mobile sharing 5G network receives an access request sent by a network sharing user from China telecommunication, judging that the user is not a home network user according to MCC and MNC information carried by user registration, not starting a cross-network signaling inquiry flow, and directly requiring the user to initially register for access. The AMF can effectively indicate the user to access quickly based on the network identification and the registration information of the access user, and the mechanism is more flexible.
Fig. 6 is a schematic diagram of signaling processing of a terminal moving from a home 4G network to a shared 5G network in an embodiment of the control method for network reselection according to the present disclosure, as shown in fig. 6:
Step 603, the NGRAN sends a registration request message, wherein the registration request message carries the GUTI.
In step 604, the AMF determines whether the UE is accessed from the shared network, if so (i.e. the 5G network and the 4G network belong to different operators), step 605 is performed, and if not (i.e. the 5G network and the 4G network belong to the same operator), step 608 is performed.
In step 605, AMF sends a registration request message.
In step 606, the UE sends a registration request message.
Step 607, the UE performs a normal initial registration procedure. The UE terminal may use the existing method for a normal initial registration procedure.
In step 608, the UE terminal performs the normal N26 interoperation procedure. The UE terminal may perform the normal N26 interworking procedure using existing methods.
When AMF judges that the network accessed by the user last time is a different operator network, the cross-network signaling inquiry process is not started, the registration request of the user is directly refused, the initial registration is started, and the original flow is kept for the same-network user interoperation.
The control method for network reselection can improve the effectiveness of cross-network reselection among different network roaming operators; for MME and AMF in the border area of an operator, newly adding cross-network user access identification capability, identifying the user as a home network user sharing network location update access in a different network roaming environment based on network access information in GUTI carried by the access user, thereby selecting the process of not starting 4G network and 5G network interoperation and the operation of context acquisition, rejecting the access, requiring the user to initially register again to reduce invalid signaling query between networks; based on the network identification and the registration information of the access user, the user is effectively indicated to be accessed quickly, and the mechanism is more flexible; the operation flow of cross-network reselection under the different-network roaming environment is optimized, and the cross-network roaming user is controlled and guided to quickly complete network access.
In one embodiment, as shown in fig. 7, the present disclosure provides a control apparatus for network reselection, comprising an access control network element 71 of a first system and an access control network element 72 of a second system. The access control network element 71 of the first system is configured to receive a registration request message sent by the terminal; wherein the registration request message is transmitted when the terminal moves from the second system to the first system. The first system is a 4G system, the second system is a 5G system, or the first system is a 5G system, and the second system is a 4G system.
The access control network element 71 of the first system is configured to acquire the network access information in the registration request message, and determine whether the first system and the second system belong to the same operator based on the network access information; if the first system and the second system do not belong to the same operator, the access control network element 71 of the first system sends a registration rejection message to the terminal to enable the terminal to start an initial registration process within the first system.
The access control network element 71 of the first system is configured to obtain address information of the access control network element of the second system if the first system and the second system belong to the same operator. The access control network element 71 of the first system is configured to obtain context information corresponding to the terminal from the access control network element 72 of the second system based on the address information for access processing to the terminal.
In one embodiment, in the case that the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME and the access control network element of the second system is an AMF.
The registration request message includes a TAU request message, and the registration reject message includes a TAU reject message; the MME is configured to receive a TAU request message sent by the terminal and send a TAU reject message to the terminal. The MME is configured to obtain context information corresponding to the terminal from the AMF based on the address information and through the N26 interface.
In one embodiment, in the case that the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is an AMF, and the access control network element of the second system is an MME.
The registration request message includes registration request message and the like, and the registration reject message includes registration reject message and the like; the AMF is configured to receive a registration request message transmitted by the terminal and to transmit a registration request message to the terminal. The AMF is configured to acquire context information corresponding to the terminal from the MME based on the address information and through the N26 interface.
In one embodiment, the present disclosure provides a computer-readable storage medium storing computer instructions that, when executed by a processor, implement a control method for network reselection as in any of the above embodiments.
The control method, the control device and the storage medium for network reselection in the embodiments can improve the effectiveness of cross-network reselection among different network roaming operators; based on the network identification and the registration information of the access user, the user can be effectively indicated to access quickly, and the mechanism is more flexible; the operation flow of cross-network reselection under the different-network roaming environment is optimized, the cross-network roaming user is controlled and guided to quickly complete network access, and the use experience of the user is improved.
The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (20)
1. A control method for network reselection, comprising:
an access control network element of a first system receives a registration request message sent by a terminal; wherein the registration request message is sent when the terminal moves from a second system to the first system;
an access control network element of the first system acquires network access information in the registration request message, and determines whether the first system and the second system belong to the same operator based on the network access information;
and if the first system and the second system do not belong to the same operator, the access control network element of the first system sends a registration rejection message to the terminal so that the terminal starts initial registration processing in the first system.
2. The method of claim 1, further comprising:
if the first system and the second system belong to the same operator, the access control network element of the first system acquires the address information of the access control network element of the second system;
and the access control network element of the first system acquires context information corresponding to the terminal from the access control network element of the second system based on the address information so as to perform access processing on the terminal.
3. The method of claim 2, wherein,
the first system is a 4G system, the second system is a 5G system, or the first system is a 5G system, and the second system is a 4G system.
4. The method of claim 3, wherein,
and if the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME and the access control network element of the second system is an AMF.
5. The method of claim 4, the registration request message comprising: a TAU request message; the registration rejection message includes: a TAU reject message; the receiving, by the access control network element of the first system, the registration request message sent by the terminal includes:
the MME receives the TAU request message sent by the terminal;
the sending, by the access control network element of the first system, the registration rejection message to the terminal includes:
and the MME sends the TAU reject message to the terminal.
6. The method of claim 4, wherein the obtaining, by the access control network element of the first system, context information corresponding to the terminal from the access control network element of the second system based on the address information comprises:
the MME obtains context information corresponding to the terminal from the AMF through an N26 interface based on the address information.
7. The method of claim 3, wherein,
and if the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is AMF, and the access control network element of the second system is MME.
8. The method of claim 7, the registration request message comprising: a registration request message; the registration rejection message includes: registration request message; the receiving, by the access control network element of the first system, the registration request message sent by the terminal includes:
the AMF receives the registration request message sent by the terminal;
the sending, by the access control network element of the first system, the registration rejection message to the terminal includes:
and the AMF sends the registration reject message to the terminal.
9. The method of claim 8, the obtaining, by the access control network element of the first system, context information corresponding to the terminal from the access control network element of the second system based on the address information comprising:
the AMF acquires context information corresponding to the terminal from the MME through an N26 interface based on the address information.
10. The method of any one of claims 1 to 9,
the network access information includes: MCC and MNC information in GUIT.
11. A control apparatus for network reselection, comprising:
an access control network element of a first system, configured to receive a registration request message sent by a terminal; wherein the registration request message is sent when the terminal moves from a second system to the first system; acquiring network access information in the registration request message, and determining whether the first system and the second system belong to the same operator based on the network access information; and if the first system and the second system do not belong to the same operator, sending a registration rejection message to the terminal so that the terminal starts initial registration processing in the first system.
12. The apparatus of claim 11, further comprising: an access control network element of a second system;
the access control network element of the first system is configured to acquire address information of the access control network element of the second system if the first system and the second system belong to the same operator; and acquiring context information corresponding to the terminal from an access control network element of the second system based on the address information so as to perform access processing on the terminal.
13. The apparatus of claim 12, wherein,
the first system is a 4G system, the second system is a 5G system, or the first system is a 5G system, and the second system is a 4G system.
14. The apparatus of claim 13, wherein,
and if the first system is a 4G system and the second system is a 5G system, the access control network element of the first system is an MME and the access control network element of the second system is an AMF.
15. The apparatus of claim 14, the registration request message comprising: a TAU request message; the registration rejection message includes: a TAU reject message;
the MME is configured to receive the TAU request message sent by the terminal and send the TAU request message to the terminal.
16. The apparatus of claim 14, wherein,
the MME is configured to acquire context information corresponding to the terminal from the AMF through an N26 interface based on the address information.
17. The apparatus of claim 13, wherein,
and if the first system is a 5G system and the second system is a 4G system, the access control network element of the first system is AMF, and the access control network element of the second system is MME.
18. The apparatus of claim 17, the registration request message comprising: a registration request message; the registration rejection message includes: registration request message;
the AMF is configured to receive the registration request message sent by the terminal and send the registration request message to the terminal.
19. The apparatus of claim 18, wherein,
the AMF is configured to acquire context information corresponding to the terminal from the MME through an N26 interface based on the address information.
20. A computer-readable storage medium having stored thereon computer instructions for execution by a processor to perform the method of any one of claims 1 to 10.
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