CN110049484B

CN110049484B - Registration method and device for movement between systems

Info

Publication number: CN110049484B
Application number: CN201810036435.XA
Authority: CN
Inventors: 杨皓睿; 金辉; 窦凤辉; 段小嫣; 李小娟; 欧阳国威
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-01-15
Filing date: 2018-01-15
Publication date: 2020-12-15
Anticipated expiration: 2038-01-15
Also published as: CN110049484A

Abstract

A registration method and device for inter-system movement are disclosed, the method comprises: the method comprises the steps that terminal equipment sends a registration request message to a first AMF in a first communication system through a 3GPP access technology, wherein the registration request message comprises a first parameter used for indicating that the terminal equipment is registered to the first communication system through a non-3GPP access technology; receiving a first message sent by the first AMF, wherein the first message comprises a second parameter; and de-registering the de-register in the non-3GPP access technology according to the second parameter, or initiating a registration request through the non-3GPP access technology according to the second parameter, so that when the terminal equipment moves from the second communication system to the first communication system, the problem that the non-3GPP signaling and data of the terminal equipment cannot be transmitted can be prevented.

Description

Registration method and device for movement between systems

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for registering inter-system mobility.

Background

A significant research issue for 5G Core networks by The 3rd Generation Partnership Project (3 GPP) standards organization is how to handle Interworking (Interworking) mobility of terminal devices between an Evolved Core Packet Core (EPC) of a 4G Core Network and a fifth Generation Core Network (The 5th Generation Core Network, 5GC) of a 5G Core Network. In addition, 5GC supports not only registration of terminal devices by 3GPP technology, for example: Evolved-Universal Radio Access Network (E-UTRAN), New air interface (NR), also support registration via Non-3GPP (Non-3GPP, N3GPP) technologies, for example: WIreless-Fidelity (Wifi), and the like.

The registration of the terminal device by the 3GPP technology and the registration by the non-3GPP technology are independent of each other. When a terminal device registers in a Public Land Mobile Network (PLMN), 5GC specifies that access mobility management network elements (AMFs) used after 3GPP and non-3GPP technologies of the terminal device are accessed need to be the same AMFs. The AMF has a set of context for registration management of 3GPP technology and a set of context for registration management of non-3GPP technology, but the AMF allocates a 5G Globally unique User Identity (5G-GUTI) to the terminal device, and the contexts are shared by the contexts of 3GPP technology and non-3GPP technology.

When the terminal device is registered to the 5GC through the 3GPP technology and the non-3GPP technology at the same time, the AMF notifies a User Data Management (UDM) of the managed access technology thereof, and the UDM stores the AMF Identifier (ID) according to different access technologies.

When the terminal device moves from the EPC to the 5GC, if the terminal device is registered in the 5GC through the non-3GPP technology, the terminal device needs to initiate a registration request to a new AMF corresponding to the 3GPP technology, and the registration request needs to carry an Additional GUTI (Additional) GUTI. Because it is required to ensure that the AMFs of the 3GPP technology and the non-3GPP technology are the same, the new AMF may find the AMF of the non-3GPP technology according to the Additional GUTI, and obtain the context of the terminal device from the AMF of the non-3GPP technology, and replace the AMF of the non-3GPP technology with the new AMF.

Based on the prior art, if the new AMF cannot contact the AMF accessed by the non-3GPP technology, the new AMF cannot obtain the context of the non-3GPP technology, but the new AMF does not know whether the AMF that cannot be contacted is the AMF of the 3GPP technology or the AMF of the non-3GPP technology, and the new AMF still continues to execute the registration procedure, notifies the terminal device of registration acceptance, and allocates a new 5G-GUTI to the terminal device. At this time, the terminal device considers that the AMFs of the 3GPP technology and the non-3GPP technology are both new AMFs, but the new AMFs have no context of the non-3GPP technology, and the new AMFs reject signaling and data transmitted by the terminal device through the non-3GPP technology, so that signaling and data transmission of the terminal device cannot be performed.

Disclosure of Invention

The embodiment of the application provides a method and a device for registering inter-system mobility, which are used for solving the problem that signaling and data cannot be transmitted when the existing terminal equipment is registered to a first communication system from a second communication system.

The embodiment of the application provides the following specific technical scheme:

in a first aspect, an embodiment of the present application provides a method for registering inter-system mobility, including: a terminal device sends a registration request message to a first access mobility management network element AMF in a first communication system through a 3GPP access technology, wherein the registration request message comprises a first parameter, and the first parameter is used for indicating that the terminal device is registered to the first communication system through a non-3GPP access technology; receiving a first message sent by the first AMF, wherein the first message comprises a second parameter; de-register is registered in the non-3GPP access technology according to the second parameter, or the terminal equipment initiates a registration request through the non-3GPP access technology according to the second parameter.

By adopting the method, when the terminal equipment moves from the second communication system to the first communication system, and when the first AMF in the first communication system cannot communicate with the second AMF, the first AMF determines that the terminal equipment is registered to the first communication system through the non-3GPP access technology according to the first parameter, and sends the second parameter to the terminal equipment, and the terminal equipment deregisters in the non-3GPP access technology according to the second parameter, or the terminal equipment initiates a registration request through the non-3GPP access technology according to the second parameter, so that the problem that the signaling and data of the non-3GPP of the terminal equipment cannot be transmitted can be prevented, and the normal use of the non-3GPP service of the terminal equipment is ensured.

In a possible design of the first aspect, the registration request message further includes a first identifier, where the first identifier is obtained when the terminal device is registered to the first communication system through a non-3GPP access technology; the first parameter is an identifier type corresponding to the first identifier, and the identifier type is a non-3GPP access technology.

In the above design, compared with the prior art, the terminal device can inform the identifier type of the first identifier of the first AMF by carrying the first parameter in the registration request message, thereby saving signaling overhead.

In a possible design of the first aspect, the registration request message further includes a second identifier obtained by the terminal registering to the first communication system through a 3GPP access technology; the first parameter is a first identity, and the first identity is obtained when the terminal equipment is registered to the first communication system through a non-3GPP access technology.

In the above design, the terminal device carries the second identifier corresponding to the 3GPP access technology and the first identifier corresponding to the non-3GPP access technology in the registration request message, so that the terminal device can not only inform the access technology corresponding to the first identifier of the first AMF, but also perform security check on the registration request message by using the second identifier.

In a possible design of the first aspect, before the terminal device sends the registration request message to the first AMF in the first communication system through the 3GPP access technology, the terminal device registers to the second communication system through the 3GPP access technology. The above registration method for intersystem movement is particularly suitable for a scenario where the terminal device moves from the second communication system to the first communication system.

In a possible design of the first aspect, the 3GPP access technology includes a global system for mobile communications GSM technology, a general packet radio service GPRS technology, a wideband code division multiple access WCDMA technology, a high speed packet access HSPA technology, a long term evolution LTE technology, and a new air interface NR technology; the non-3GPP technologies include code division multiple access CDMA technology, wireless fidelity Wi-Fi, and wired access technology.

In a second aspect, an embodiment of the present application provides a method for registering inter-system mobility, including: a first mobility management network element AMF in a first communication system receives a registration request message sent by a terminal device through a 3GPP access technology, wherein the registration request message comprises a first parameter, and the first parameter is used for indicating the terminal device to register to the first communication system through a non-3GPP access technology; when the first AMF determines that the first AMF cannot communicate with a second AMF, an indication message is sent to a unified data management network element (UDM), wherein the indication message is used for indicating the UDM to register the de-register to the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology; and the first AMF sends a first message to the terminal equipment, wherein the first message comprises a second parameter, and the second parameter is used for indicating the terminal equipment to register de-register in the non-3GPP access technology or to re-register through the non-3GPP access technology.

By adopting the method, when the terminal equipment moves to the first communication system, and the first AMF in the first communication system determines that the terminal equipment can not communicate with the second AMF, the first AMF determines that the terminal equipment is registered to the first communication system through the non-3GPP access technology according to the first parameter, and sends the second parameter to the terminal equipment, and the terminal equipment registers in the non-3GPP access technology according to the second parameter, or the terminal equipment initiates a registration request through the non-3GPP access technology according to the second parameter, so that the problem that the signaling and data of the non-3GPP of the terminal equipment can not be transmitted can be prevented, and the normal use of the non-3GPP service of the terminal equipment is ensured.

In a third aspect, an embodiment of the present application provides a terminal device, including: a sending unit, configured to send a registration request message to a first access mobility management network element AMF in a first communication system through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device has registered in the first communication system through a non-3GPP access technology; a receiving unit, configured to receive a first message sent by the first AMF, where the first message includes a second parameter; and the processing unit is used for registering the de-register in the non-3GPP access technology according to the second parameter, or the terminal equipment initiates a registration request through the non-3GPP access technology according to the second parameter.

In a possible design of the third aspect, the registration request message further includes a first identifier, where the first identifier is obtained when the terminal device is registered to the first communication system through a non-3GPP access technology; the first parameter is an identifier type corresponding to the first identifier, and the identifier type is a non-3GPP access technology.

In a possible design of the third aspect, the registration request message further includes a second identifier obtained by the terminal registering to the first communication system through a 3GPP access technology; the first parameter is a first identity, and the first identity is obtained when the terminal equipment is registered to the first communication system through a non-3GPP access technology.

In a possible design of the third aspect, the processing unit is further configured to register with the second communication system through the 3GPP access technology before the sending unit sends the registration request message to the first AMF in the first communication system through the 3GPP access technology.

In a possible design of the third aspect, the 3GPP access technology includes a global system for mobile communications GSM technology, a general packet radio service GPRS technology, a wideband code division multiple access WCDMA technology, a high speed packet access HSPA technology, a long term evolution LTE technology, and a new air interface NR technology; the non-3GPP technologies include code division multiple access CDMA technology, wireless fidelity Wi-Fi, and wired access technology.

In a fourth aspect, an embodiment of the present application provides a communication apparatus, which is applied to a first mobility management network element AMF in a first communication system, and includes: a receiving unit, configured to receive a registration request message sent by a terminal device through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device is also registered in the first communication system through a non-3GPP access technology; a processing unit to determine that communication with the second AMF is not possible; a sending unit, configured to send an indication message to a unified data management network element UDM, where the indication message is used to indicate the UDM to register the de-register in the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology; the sending unit is further configured to send a first message to the terminal device, where the first message includes a second parameter, and the second parameter is used to instruct the terminal device to de-register in the non-3GPP access technology or re-register through the non-3GPP access technology.

In a fifth aspect, an embodiment of the present application provides an apparatus, where the apparatus may be a terminal device or a chip. The apparatus has the function of implementing the embodiments of the first aspect described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a sixth aspect, an embodiment of the present application provides an apparatus, including: a processor and a memory; the memory is configured to store computer executable instructions, and when the apparatus is running, the processor is configured to execute the computer executable instructions stored by the memory, so as to enable the apparatus to perform the registration method according to any one of the first aspect.

In a seventh aspect, an embodiment of the present application provides an apparatus, where the apparatus may be a mobility management network element or a chip. The apparatus has the function of implementing the embodiments of the second aspect described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In an eighth aspect, an embodiment of the present application provides an apparatus, including: a processor and a memory; the memory is configured to store computer executable instructions, and when the apparatus is running, the processor executes the computer executable instructions stored in the memory, so as to cause the apparatus to perform the registration method according to any one of the second aspect.

In a ninth aspect, embodiments of the present application further provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the method of the above aspects.

In a tenth aspect, an embodiment of the present application further provides a system, where the system includes the first mobility management network element and the terminal device in any of the method embodiments or the apparatus embodiments described above.

In addition, for technical effects brought by any one implementation manner of the third aspect to the tenth aspect, reference may be made to technical effects brought by different implementation manners of the first aspect to the second aspect, and details are not described here again.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

Fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present application;

FIG. 2 is a flowchart of a method for registering inter-system mobility according to an embodiment of the present disclosure;

fig. 3 and 4 are interaction flowcharts of a registration method for intersystem mobility according to an embodiment of the present application;

FIG. 5 is a schematic view of an apparatus provided herein;

FIG. 6 is a schematic view of another apparatus provided herein;

fig. 7 is a schematic view of another apparatus provided herein.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

Fig. 1 is a schematic diagram of a network architecture provided in an embodiment of the present application, where network elements mainly related in the network architecture include a terminal device, an Access and Mobility Management element (AMF), a Unified Data Management element (UDM), a Session Management element (SMF), and a User Plane element (UPF).

Fig. 1 relates to two Access networks of different Access types, such as a 3GPP Access Network and a non-3GPP Access Network, where the 3GPP Access Network includes two 3GPP Access Network technologies, namely, an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) technology and a New Radio Access (New Radio) technology. The terminal equipment is accessed to a Mobility Management Entity (MME) through an E-UTRAN and is connected with a Packet Data Network gateway (PGW); and the terminal equipment accesses the AMF through the NR access network.

Wherein:

the terminal device may be a User Equipment (UE) that can access a network, for example, the terminal device may be an intelligent terminal device such as a mobile phone and a tablet computer, for example, the terminal device may be a communication device such as a server, a gateway, a base station, and a controller, and for example, the terminal device may be an internet of things device such as a sensor, an electric meter, and a water meter.

UDM, using subscription and authentication data stored in a Home Subscriber Server (HSS), is typically a network element co-located with the HSS. The present application defaults to the UDM including the functionality of the HSS when using the UDM.

The SMF is used for controlling related signaling in the process of establishing, deleting or modifying the session for the terminal equipment, and the SMF and the PGW are combined network elements.

And the AMF is responsible for registration management, reachability management, mobility management and the like of the terminal equipment.

The UPF may also be referred to as a Data plane gateway, such as an egress gateway, where user Data is accessed to a Data Network (DN) through the Network element, and the UPF may be an internet or a service server of a third party, and the like.

A Non-3GPP Interworking Function network element (N3 IWF), where the Non-3GPP access network is connected to the 5G core network through an N3 IWF.

Data Networks (DNs), such as networks provided by operator services, internet access or third party services, etc.

The initial registration process of the terminal in the 5G core network involves the execution of a network access control function (e.g., user authentication and access authorization based on subscription profile in UDM). As a result of the registration procedure, the identity of the AMF of the service terminal will be registered in the UDM. The registration management procedure is applicable to both 3GPP and non-3GPP accesses.

The AMF allocates a single temporary identity, GUTI, to the UE, between the UE and the AMF, which is commonly used for both 3GPP and non-3GPP access. The temporary identity is allocated when the UE is successfully registered for the first time, and is valid for both 3GPP and non-3GPP accesses for the UE. When the UE performs any registration via non-3GPP access technology or 3GPP access technology, the UE should provide in the access stratum signaling the temporary identity it received when successfully registered via any access technology before. This enables the AN-access network to select to AN AMF that maintains the UE context, which was created in the previous registration procedure; this enables the AMF to associate to an existing UE context based on the temporary identity in the request. The temporary identity may be allocated or re-allocated by any 3GPP and to 3GPP access.

Various embodiments of the present application are described in detail below with reference to the drawings attached hereto. It should be noted that the display sequence of the embodiment of the present application only represents the sequence of the embodiment, and does not represent the merits of the technical solutions provided by the embodiments.

For the network architecture shown in fig. 1, embodiments of the present application provide a method and an apparatus for inter-system mobility registration, so as to solve a problem that signaling and data cannot be transmitted when an existing terminal device registers from a second communication system to a first communication system. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the network element are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not described again.

Referring to fig. 2, an embodiment of the present application provides a method for registering inter-system mobility, which includes the following specific processes:

step 20: the method comprises the steps that a terminal device sends a registration request message to a first AMF in a first communication system through a 3GPP access technology, wherein the registration request message comprises a first parameter, and the first parameter is used for indicating that the terminal device is registered to the first communication system through a non-3GPP access technology.

Further, before the terminal device sends a registration request message to the first AMF in the first communication system through the 3GPP access technology, the terminal device registers to the second communication system through the 3GPP access technology.

In one possible design, the first communication system is a 5G system and the second communication system is a 3G system or a 4G system.

The first AMF is a core network entity corresponding to a 3GPP access technology. As is clear from the characterizing meaning of the first parameter, the terminal device has registered with the first communication system via the non-3GPP access technology at the time of sending the registration request message.

In a possible design, the registration request message further includes a first identifier, where the first identifier is a GUTI obtained when the terminal device is registered in the first communication system through a non-3GPP access technology, and is referred to as an Additional GUTI in this application, and at this time, the first parameter is an identifier type corresponding to the first identifier, and the identifier type is a non-3GPP access technology.

In another possible design, the registration request message further includes a second identifier obtained by the terminal registering to the first communication system through a 3GPP access technology, which is referred to as a 3GPP Additional GUTI in this application. At this time, the first parameter is a first identifier, where the first identifier is obtained when the terminal device is registered in the first communication system through a non-3GPP access technology, and is referred to as an N3GPP Additional GUTI in this application. At this time, if the inter-system mobility scenario of the terminal device is from the first communication system to the second communication system, and then from the second communication system to the first communication system, the first AMF obtains the security context when the terminal device is previously registered in the first communication system through the 3GPP technology according to the 3GPP Additional GUTI, and performs integrity check on the registration request message using the security parameters in the security context.

Step 21: and when determining that the first AMF cannot communicate with a second AMF, the first AMF sends an indication message to the UDM, wherein the indication message is used for indicating the UDM to register the de-register to the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology.

Further, when the network slice of the first AMF deployment is isolated from the network slice of the second AMF deployment, determining that the first AMF cannot communicate with the second AMF; or when there is no deployment interface between the network slice deployed by the first AMF and the network slice deployed by the second AMF, determining that the first AMF cannot communicate with the second AMF; alternatively, a failure of the first communication system results in the first AMF determining that it is unable to communicate with the second AMF.

Step 22: and the terminal equipment receives a first message sent by the first AMF, wherein the first message comprises a second parameter, and the second parameter is used for indicating the terminal equipment to register a de-register in the non-3GPP access technology or to re-register through the non-3GPP access technology.

Optionally, the first message is a registration accept message or a deregistration message.

Step 23: after receiving the first message sent by the first AMF, the terminal equipment registers a de-register in the non-3GPP access technology according to the second parameter, or initiates a registration request through the non-3GPP access technology according to the second parameter.

It should be noted that the 3GPP Access technology in the embodiment of the present application includes Global System for Mobile communications (GSM) technology, General Packet Radio Service (GPRS) technology, Wideband Code Division Multiple Access (WCDMA) technology, High-Speed Packet Access (HSPA) technology, Universal Mobile Telecommunications System (UMTS) technology, Evolved UMTS Terrestrial Radio Access (Evolved-UMTS Radio Access, E-UTRA) technology, and NR technology; the non-3GPP technologies include Code Division Multiple Access (CDMA) technology, Wi-Fi technology, and wired Access technology.

Through the above process, when the terminal device moves from the second communication system to the first communication system, and when the first AMF in the first communication system cannot communicate with the second AMF, the first AMF determines that the terminal device has registered to the first communication system through the non-3GPP access technology according to the first parameter, and sends the second parameter to the terminal device, and the terminal device deregisters in the non-3GPP access technology according to the second parameter, or the terminal device initiates a registration request through the non-3GPP access technology according to the second parameter, so that the problem that the signaling and data of the non-3GPP of the terminal device cannot be transmitted can be prevented.

Taking the example that the first communication system is a 5G system and the second communication system is a 4G system, the method shown in fig. 2 is described in detail through two application scenarios.

Application scenario one

In the first application scenario, the terminal device moves from the 4G system to the 5G system, and a registration request message sent to a first AMF of the 5G system includes an Additional GUTI and a first parameter, where the first parameter is an identifier Type Additional GUTI Type corresponding to the Additional GUTI. The specific process is shown in fig. 3.

The terminal device attaches to the EPC through a 3GPP access technology while registering with the 5GC through a non-3GPP access technology.

31. The terminal equipment sends a registration request message to the first AMF, wherein the registration request message comprises an old (old) GUTI, an Additional GUTI and an Additional GUTI Type in the 4G, and the Additional GUTI Type is used for indicating that the Additional GUTI is allocated to the second AMF corresponding to the non-3GPP technology.

32. And the first AMF obtains an MME Identification (ID) according to the Old GUTI and obtains the 4G context of the terminal equipment from the corresponding MME.

33. The first AMF knows that the Additional GUTI is allocated to the second AMF corresponding to the non-3GPP technology according to the Additional GUTI Type, but cannot communicate with the second AMF. And the first AMF determines that the second AMF is the AMF registered by the non-3GPP technology according to the Additional GUTI Type.

34. The first AMF calls a subscription acquisition and registration service of the UDM, a request for calling the registration service comprises an AMF ID or an address of the first AMF corresponding to the 3GPP technology, namely the 3GPP AMF ID, a non-3GPP Location logout instruction (N3GPP Cancel Location) is used for indicating the UDM to register a second AMF corresponding to the non-3GPP technology, and the UDM can save the AMF corresponding to the 3GPP technology as the first AMF.

35. And the UDM calls a De-registration (De-registration) service according to the stored AMF ID or address of the second AMF corresponding to the non-3GPP technology, informs the second AMF corresponding to the non-3GPP technology of De-registering the terminal equipment, and deletes the stored AMF ID or address of the AMF corresponding to the non-3GPP technology.

36. And the second AMF corresponding to the non-3GPP technology initiates de-registration of the terminal equipment and deletes related network resources.

It should be noted that 37a and 37b +37c are two alternative parallel schemes from which one execution may be selected.

37a, the first AMF sends a registration acceptance message to the terminal device, where the registration acceptance message includes a new 5G-GUTI, and a non-3GPP Deregistration Indicator (N3GPP registration Indicator) of the N3GPP registration Indicator is used to indicate that the terminal device locally deregisters the second AMF corresponding to the non-3GPP technology, or indicate that the terminal device re-registers through the non-3GPP technology.

37b, the first AMF sends a registration acceptance message to the terminal equipment, wherein the registration acceptance message contains the new 5G-GUTI.

37c, the first AMF sends a Deregistration message to the terminal device, wherein the Deregistration message includes an N3GPP explicit registration Indicator, which is used for indicating the terminal device to locally deregister the second AMF corresponding to the non-3GPP technology, or indicating the terminal device to re-register through the non-3GPP technology.

38. The terminal equipment locally registers a second AMF corresponding to the non-3GPP technology according to an N3GPP Implicit registration Indicator, if a registration request of the non-3GPP technology needs to be reinitiated, a new 5G-GUTI received in a registration acceptance message is carried in an access layer message corresponding to the non-3GPP, so that the access layer finds the first AMF, and the reregistration through the non-3GPP technology is completed.

Application scenario two

In an application scenario two, the terminal device moves from the 4G system to the 5G system, a registration request message sent to a first AMF of the 5G system includes a first parameter and a second identifier, where the second identifier is an Additional GUTI obtained when the terminal device is registered in the first communication system through a 3GPP access technology, that is, a 3GPP Additional GUTI, at this time, the first parameter is a first identifier, and the first identifier is an Additional GUTI obtained when the terminal device is registered in the first communication system through a non-3GPP access technology, that is, an N3GPP Additional GUTI. The specific process is shown in fig. 4.

40. The terminal device attaches to the EPC through a 3GPP access technology while registering with the 5GC through a non-3GPP access technology.

41. The terminal equipment sends a registration request message to the first AMF, wherein the registration request message comprises an old (old) GUTI, a 3GPP Additional GUTI and an N3GPP Additional GUTI in the 4G.

42. And the first AMF obtains the MME ID according to the Old GUTI and obtains the 4G context of the terminal equipment from the corresponding MME.

43. The first AMF knows that the Additional GUTI is allocated to a second AMF corresponding to the non-3GPP technology according to the Additional GUTI, but cannot communicate with the second AMF; and the first AMF obtains the 5G context of the terminal equipment according to the 3GPP Additional GUTI and carries out the end-of-guarantee check on the registration request message.

44. The first AMF calls a subscription acquisition and registration service of the UDM, a request for calling the registration service comprises an AMF ID or an address of the first AMF corresponding to the 3GPP technology, namely the 3GPP AMF ID, a non-3GPP Location logout instruction (N3GPP Cancel Location) is used for indicating the UDM to register a second AMF corresponding to the non-3GPP technology, and the UDM can save the AMF corresponding to the 3GPP technology as the first AMF.

45. And the UDM calls a De-registration (De-registration) service according to the stored AMF ID or address of the second AMF corresponding to the non-3GPP technology, informs the second AMF corresponding to the non-3GPP technology of De-registering the terminal equipment, and deletes the stored AMF ID or address of the AMF corresponding to the non-3GPP technology.

46. And the second AMF corresponding to the non-3GPP technology initiates de-registration of the terminal equipment and deletes related network resources.

It should be noted that 47a and 47b +47c are two alternative parallel schemes from which one execution may be selected.

47a, the first AMF sends a registration acceptance message to the terminal device, where the registration acceptance message includes a new 5G-GUTI, and a non-3GPP Deregistration Indicator (N3GPP registration Indicator) of the N3GPP registration Indicator is used to indicate that the terminal device locally deregisters the second AMF corresponding to the non-3GPP technology, or to indicate that the terminal device re-registers through the non-3GPP technology.

47b, the first AMF sends a registration acceptance message to the terminal equipment, wherein the registration acceptance message comprises the new 5G-GUTI.

And 47c, the first AMF sends a Deregistration message to the terminal equipment, wherein the Deregistration message comprises an N3GPP Implicit registration Indicator, and is used for indicating the terminal equipment to locally deregister a second AMF corresponding to the non-3GPP technology or indicating the terminal equipment to re-register through the non-3GPP technology.

48. The terminal equipment locally registers a second AMF corresponding to the non-3GPP technology according to an N3GPP Implicit registration Indicator, if a registration request of the non-3GPP technology needs to be reinitiated, a new 5G-GUTI received in a registration acceptance message is carried in an access layer message corresponding to the non-3GPP, so that the access layer finds the first AMF, and the reregistration through the non-3GPP technology is completed.

Based on the same inventive concept, as shown in fig. 5, a schematic diagram of an apparatus provided in the embodiment of the present application, where the apparatus may be a terminal device or a mobility management network element, and may perform the method of any of the foregoing embodiments.

The apparatus 500 includes at least one processor 501, communication lines 502, memory 503, and at least one communication interface 504.

The processor 501 may be a general processing unit (CPU), a microprocessor, an application-specific integrated circuit (server IC), or one or more ICs for controlling the execution of programs in accordance with the present disclosure.

The communication link 502 may include a path for transmitting information between the aforementioned components.

The communication interface 504 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), etc.

The memory 503 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory may be separate and coupled to the processor via a communication line 502. The memory may also be integral to the processor.

The memory 503 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 501 to execute. The processor 501 is configured to execute computer-executable instructions stored in the memory 503, so as to implement the inter-system mobility registration method provided by the above-mentioned embodiment of the present application.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

In particular implementations, processor 501 may include one or more CPUs such as CPU0 and CPU1 in fig. 7 as an example.

In particular implementations, apparatus 500 may include multiple processors, such as processor 501 and processor 508 in FIG. 7, for example, as an example. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In particular implementations, apparatus 500 may also include an output device 505 and an input device 506, as one embodiment. An output device 505, which is in communication with the processor 501, may display information in a variety of ways. For example, the output device 505 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 506 is in communication with the processor 501 and may receive user input in a variety of ways. For example, the input device 506 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.

The apparatus 500 may be a general-purpose device or a special-purpose device. In a specific implementation, the apparatus 500 may be a desktop, a laptop, a web server, a Personal Digital Assistant (PDA), a mobile phone, a tablet, a wireless terminal device, an embedded device, or a device with a similar structure as in fig. 5. The embodiment of the present application does not limit the type of the apparatus 500.

When the apparatus shown in fig. 5 is a chip, which may be a chip of a terminal device or a chip of a mobility management network element, for example, the chip includes a processor 501 (which may also include a processor 508), a communication line 502, a memory 503 and a communication interface 504. In particular, the communication interface 504 may be an input interface, a pin or a circuit, or the like. The memory 503 may be a register, cache, or the like. The processor 501 and the processor 508 may be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of programs for the registration method for intersystem mobility according to any of the above embodiments.

The present application may perform division of functional modules on the apparatus according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation. For example, in the case of dividing each functional module by corresponding functions, fig. 6 shows a schematic diagram of an apparatus, the apparatus 600 may be the terminal device in the above embodiment, and the apparatus 600 includes a transmitting unit 601, a receiving unit 602, and a processing unit 603.

A sending unit 601, configured to send a registration request message to a first access mobility management network element AMF in a first communication system through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device has registered in the first communication system through a non-3GPP access technology;

a receiving unit 602, configured to receive a first message sent by the first AMF, where the first message includes a second parameter;

a processing unit 603, configured to de-register the de-register in the non-3GPP access technology according to the second parameter, or the terminal device initiates a registration request through the non-3GPP access technology according to the second parameter.

Optionally, the registration request message further includes a first identifier, where the first identifier is obtained when the terminal device is registered in the first communication system through a non-3GPP access technology; the first parameter is an identifier type corresponding to the first identifier, and the identifier type is a non-3GPP access technology.

Optionally, the registration request message further includes a second identifier obtained by the terminal registering to the first communication system through a 3GPP access technology; the first parameter is a first identity, and the first identity is obtained when the terminal equipment is registered to the first communication system through a non-3GPP access technology.

Optionally, the processing unit 603 is further configured to register to the second communication system through the 3GPP access technology before the sending unit 601 sends the registration request message to the first AMF in the first communication system through the 3GPP access technology.

Optionally, the 3GPP access technology includes a global system for mobile communications GSM technology, a general packet radio service GPRS technology, a wideband code division multiple access WCDMA technology, a high speed packet access HSPA technology, a long term evolution LTE technology, and a new air interface NR technology; the non-3GPP technologies include code division multiple access CDMA technology, wireless fidelity Wi-Fi, and wired access technology.

It should be understood that the apparatus may be used to implement the steps executed by the terminal device in the method according to the embodiment of the present invention, and the related features may refer to the foregoing description, which is not described herein again.

Specifically, the functions/implementation procedures of the receiving unit 602, the processing unit 603, and the sending unit 601 in fig. 6 can be implemented by the processor 501 in fig. 5 calling a computer executing instruction stored in the memory 503. Alternatively, the functions/implementation procedures of the processing unit 603 in fig. 6 may be implemented by the processor 501 in fig. 5 calling a computer executing instruction stored in the memory 503, and the functions/implementation procedures of the receiving unit 602 and the transmitting unit 601 in fig. 6 may be implemented by the communication interface 504 in fig. 5.

Alternatively, when the apparatus 600 is a chip, the functions/implementation processes of the receiving unit 602 and the sending unit 601 may also be implemented by pins or circuits. Alternatively, when the apparatus 600 is a chip, the memory 503 may be a storage unit in the chip, such as a register, a cache, and the like. Of course, when the apparatus 800 is a mobility management network element, the memory 503 may be a storage unit located outside a chip in a terminal device, and this is not specifically limited in this embodiment of the present application.

The present application may perform division of functional modules on the apparatus according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation. For example, in the case of dividing each functional module by corresponding functions, fig. 7 shows a schematic diagram of an apparatus, the apparatus 700 may be the first AMF mentioned in the above embodiments, and the apparatus 700 includes a receiving unit 701, a processing unit 702, and a sending unit 703.

A receiving unit 701, configured to receive a registration request message sent by a terminal device through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device is also registered in the first communication system through a non-3GPP access technology;

a processing unit 702 for determining that communication with the second AMF is not possible;

a sending unit 703, configured to send an indication message to a unified data management network element UDM, where the indication message is used to indicate the UDM to register the de-register in the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology;

the sending unit 703 is further configured to send a first message to the terminal device, where the first message includes a second parameter, and the second parameter is used to instruct the terminal device to de-register in the non-3GPP access technology or re-register through the non-3GPP access technology.

It should be understood that the apparatus may be used to implement the steps performed by the mobility management element in the method according to the embodiment of the present invention, and reference may be made to the above for related features, which are not described herein again.

Specifically, the functions/implementation procedures of the receiving unit 701, the processing unit 702, and the sending unit 703 in fig. 7 may be implemented by the processor 501 in fig. 5 calling a computer executing instruction stored in the memory 503. Alternatively, the function/implementation procedure of the processing unit 702 in fig. 7 may be implemented by the processor 501 in fig. 5 calling a computer executing instruction stored in the memory 503, and the function/implementation procedures of the receiving unit 701 and the sending unit 703 in fig. 7 may be implemented by the communication interface 504 in fig. 5.

Alternatively, when the apparatus 700 is a chip, the functions/implementation processes of the receiving unit 701 and the sending unit 703 may also be implemented by pins or circuits. Alternatively, when the apparatus 700 is a chip, the memory 503 may be a storage unit in the chip, such as a register, a cache, and the like. Of course, when the apparatus 700 is a first mobility management network element, the memory 503 may be a storage unit located outside a chip in the first mobility management network element, and this embodiment of the present application is not particularly limited in this respect.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method for registering inter-system mobility, comprising:

a terminal device sends a registration request message to a first access mobility management network element AMF in a first communication system through a 3GPP access technology, wherein the registration request message comprises a first parameter, and the first parameter is used for indicating that the terminal device is registered to the first communication system through a non-3GPP access technology;

the terminal equipment receives a first message sent by the first AMF, wherein the first message comprises a second parameter;

the terminal equipment registers a de-register in the non-3GPP access technology according to the second parameter, or the terminal equipment initiates a registration request through the non-3GPP access technology according to the second parameter;

when the first AMF determines that the first AMF cannot communicate with a second AMF, the first message is sent after the first AMF sends an indication message to a unified data management network element (UDM), the indication message is used for indicating the UDM to register the second AMF, and the second AMF is a core network element corresponding to the non-3GPP access technology.

2. The method of claim 1, wherein the registration request message further includes a first identity obtained when the terminal device is registered with the first communication system via a non-3GPP access technology;

the first parameter is an identifier type corresponding to the first identifier, and the identifier type is a non-3GPP access technology.

3. The method of claim 1, wherein the registration request message further includes a second identity obtained by the terminal registering with the first communication system via a 3GPP access technology;

the first parameter is a first identity, and the first identity is obtained when the terminal equipment is registered to the first communication system through a non-3GPP access technology.

4. The method of claim 1, wherein before the terminal device sends the registration request message to the first AMF in the first communication system via a 3GPP access technology, further comprising:

the terminal device registers to the second communication system through a 3GPP access technology.

5. The method of claim 1, wherein the 3GPP access technology comprises global system for mobile communications GSM technology, general packet radio service GPRS technology, wideband code division multiple access, WCDMA, high speed packet access, HSPA, long term evolution, LTE, and new air interface, NR, technology; the non-3GPP technologies include code division multiple access CDMA technology, wireless fidelity Wi-Fi, and wired access technology.

6. A method for registering inter-system mobility, comprising:

a first mobility management network element AMF in a first communication system receives a registration request message sent by a terminal device through a 3GPP access technology, wherein the registration request message comprises a first parameter, and the first parameter is used for indicating the terminal device to register to the first communication system through a non-3GPP access technology;

when the first AMF determines that the first AMF cannot communicate with a second AMF, an indication message is sent to a unified data management network element (UDM), wherein the indication message is used for indicating the UDM to register the de-register to the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology;

and the first AMF sends a first message to the terminal equipment, wherein the first message comprises a second parameter, and the second parameter is used for indicating the terminal equipment to register de-register in the non-3GPP access technology or to re-register through the non-3GPP access technology.

7. A terminal device, comprising:

a sending unit, configured to send a registration request message to a first access mobility management network element AMF in a first communication system through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device has registered in the first communication system through a non-3GPP access technology;

a receiving unit, configured to receive a first message sent by the first AMF, where the first message includes a second parameter;

a processing unit, configured to de-register a de-register in the non-3GPP access technology according to the second parameter, or initiate, by the terminal device, a registration request through the non-3GPP access technology according to the second parameter;

8. The terminal device of claim 7, wherein the registration request message further includes a first identity obtained when the terminal device registers with the first communication system via a non-3GPP access technology;

9. The terminal device of claim 7, wherein the registration request message further includes a second identity obtained by the terminal registering with the first communication system through a 3GPP access technology;

10. The terminal device of claim 7, wherein the processing unit is further configured to register with a second communication system via a 3GPP access technology before the sending unit sends the registration request message to the first AMF in the first communication system via the 3GPP access technology.

11. The terminal device of claim 7, wherein the 3GPP access technology comprises global system for mobile communications GSM technology, general packet radio service GPRS technology, wideband code division multiple access, WCDMA, high speed packet access, HSPA, long term evolution, LTE, and new air interface, NR, technology; the non-3GPP technologies include code division multiple access CDMA technology, wireless fidelity Wi-Fi, and wired access technology.

12. A communication apparatus, applied to a first mobility management network element AMF in a first communication system, includes:

a receiving unit, configured to receive a registration request message sent by a terminal device through a 3GPP access technology, where the registration request message includes a first parameter, and the first parameter is used to indicate that the terminal device is also registered in the first communication system through a non-3GPP access technology;

a processing unit to determine that communication with the second AMF is not possible;

a sending unit, configured to send an indication message to a unified data management network element UDM, where the indication message is used to indicate the UDM to register the de-register in the second AMF, and the second AMF is a core network element corresponding to a non-3GPP access technology;

the sending unit is further configured to send a first message to the terminal device, where the first message includes a second parameter, and the second parameter is used to instruct the terminal device to de-register in the non-3GPP access technology or re-register through the non-3GPP access technology.