CN109788511B - Network changing method of terminal and core network equipment - Google Patents
Network changing method of terminal and core network equipment Download PDFInfo
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Abstract
The embodiment of the application provides a network change method of a terminal and core network equipment, wherein the method comprises the following steps: a first core network device receives indication information from a second core network device, where the indication information is used to indicate that a terminal is a CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network; and sending a position updating message to the CS domain core network equipment, wherein the position updating message is used for indicating the CS domain core network equipment to update the position of the terminal. The method and the device realize that the terminal can be indicated to the first core network equipment as the CSFB user to support the CSFB service flow under the condition that the terminal is moved from the second network to the first network.
Description
Technical Field
The present application relates to wireless communication technologies, and in particular, to a network changing method for a terminal and a core network device.
Background
In a Long Term Evolution (LTE) system, that is, a fourth generation (4G) mobile communication system, technologies for carrying voice services are mainly classified into two types: the Circuit Switch (CS) domain is reused, or the voice over PS domain is carried by the Packet Switch (PS) domain. At the initial stage of network establishment in an Evolved Packet System (EPS), if an operator already has a mature second generation (2G)/third generation (3G) network, the original CS domain voice scheme may be adopted to provide voice services, and LTE handles PS domain services. One of the main implementation schemes is a Circuit Switched Fallback (CSFB) technology, that is, a terminal under LTE coverage falls back into a 2G/3G network to complete service processing when needing to process a CS service, so as to achieve the purpose of reusing the existing CS domain network to provide a voice service for the terminal in the EPS network. The CSFB feature is essentially a session establishment procedure, i.e. the terminal has entered the CS network before the CS domain voice session is established, and the terminal is always located in the CS network during the whole voice call phase.
In future fifth generation (5G) networks, the implementation of CSFB techniques has not been determined.
Disclosure of Invention
The embodiment of the application provides a network change method of a terminal and core network equipment, and provides a scheme for switching/reselecting between a 5G network and a 4G network, which is used for supporting a CSFB (Circuit switched fallback) user to normally perform a CSFB (Circuit switched fallback) process when the CSFB user moves between the 5G network and the 4G network.
In a first aspect, the present application provides a method for changing a network of a terminal, including:
a first core network device receives indication information from a second core network device, where the indication information is used to indicate that a terminal is a circuit switched domain fallback (CSFB) user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network;
the first core network device sends a location update message to a Circuit Switched (CS) domain core network device, wherein the location update message is used for indicating the CS domain core network device to update the location of the terminal.
In one possible design, the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
before the first core network device receives the indication information from the second core network device, the method further includes:
the first core network equipment receives a tracking area update TAU request from the terminal, wherein the TAU request comprises a joint tracking area update instruction;
after receiving the TAU request, the first core network device sends a context request message to the second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
In one possible design, the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
before the first core network device receives the indication information from the second core network device, the method further includes:
the first core network equipment receives a registration area update RAU request from the terminal, wherein the RAU request comprises a joint registration area update instruction;
after receiving the RAU request, the first core network device sends a context request message to the second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
In one possible design, the receiving, by the first core network device, the indication information from the second core network device includes:
and the first core network equipment receives a context response message from the second core network equipment, wherein the context response message carries the indication information.
In one possible design, the indication information includes one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
In one possible design, the receiving, by the first core network device, the indication information from the second core network device includes:
and the first core network equipment receives a forwarding and transferring request from second core network equipment, wherein the forwarding and transferring request carries the indication information.
In one possible design, the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
In one possible design, after the first core network device sends the location update message to the CS domain core network device, the method further includes:
the first core network equipment receives an interface establishment request message sent by the CS domain core network equipment;
and the first core network equipment establishes an interface of the terminal with the CS domain core network equipment according to the interface establishment request message.
In a second aspect, the present application provides a network changing method for a terminal, including:
the method comprises the steps that a second core network device sends indication information to a first core network device, wherein the indication information is used for indicating that a terminal is information of a Circuit Switched Fallback (CSFB) user, the first core network device belongs to a first network, the second core network device belongs to a second network, and the position of the terminal is moved to the first network from the second network.
In one possible design, the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
before the second core network device sends the indication information to the first core network device, the method further includes:
and the second core network device receives a context request message sent by the first core network device after receiving a tracking area update TAU request, wherein the context request message is used for requesting information indicating that the terminal is a CSFB user.
In one possible design, the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
before the second core network device sends the indication information to the first core network device, the method further includes:
the second core network device receives a context request message sent by the first core network device after receiving a registration area update RAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
In one possible design, the sending, by the second core network device, the indication information to the first core network device includes:
and the second core network equipment sends a context response message to the first core network equipment, wherein the context response message carries the indication information.
In one possible design, the indication information includes one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
In one possible design, the sending, by the second core network device, the indication information to the first core network device includes:
and the second core network equipment sends a forwarding and migrating request to the first core network equipment, wherein the forwarding and migrating request carries the indication information.
In one possible design, the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
In one possible design, the method further includes:
the second core network equipment receives an interface release request message sent by the CS domain core network equipment;
and the second core network equipment releases the interface of the terminal between the second core network equipment and the CS domain core network equipment according to the interface release request message.
In a third aspect, the present application provides a core network device, where the core network device is a first core network device, and the core network device includes:
a receiving module, configured to receive indication information from a second core network device, where the indication information is used to indicate that a terminal is a circuit switched domain fallback CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network;
a sending module, configured to send a location update message to a CS domain core network device, where the location update message is used to instruct the CS domain core network device to update a location of the terminal.
In one possible design, the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
the receiving module is further configured to receive a tracking area update TAU request from the terminal, where the TAU request includes a joint tracking area update indication;
the sending module is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
In one possible design, the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
the receiving module is further configured to receive a registration area update RAU request from the terminal, where the RAU request includes a joint registration area update indication;
the sending module is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
In a possible design, the receiving module is specifically configured to receive a context response message from the second core network device, where the context response message carries the indication information.
In one possible design, the indication information includes one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
In a possible design, the receiving module is specifically configured to receive a forwarding and migrating request from a second core network device, where the forwarding and migrating request carries the indication information.
In one possible design, the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
In one possible design, the core network device further includes: establishing a module;
the receiving module is further configured to receive an interface establishment request message sent by the CS domain core network device;
the establishing module is configured to establish an interface of the terminal with the CS domain core network device according to the interface establishment request message.
In a fourth aspect, the present application provides a core network device, where the core network device is a second core network device, and the core network device includes:
the device comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending indication information to first core network equipment, the indication information is used for indicating that a terminal is information of a Circuit Switched Fallback (CSFB) user, the first core network equipment belongs to a first network, the second core network equipment belongs to a second network, and the position of the terminal is moved to the first network from the second network.
In one possible design, the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
the core network device further includes: a receiving module, configured to receive a context request message sent by the first core network device after receiving a tracking area update TAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
In one possible design, the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
the core network device further includes: a receiving module, configured to receive a context request message sent by the first core network device after receiving a registration area RAU update request, where the context request message is used to request information indicating that the terminal is a CSFB user.
In a possible design, the sending module is specifically configured to send a context response message to the first core network device, where the context response message carries the indication information.
In one possible design, the indication information includes one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
In a possible design, the sending module is specifically configured to send a forwarding and migration request to the first core network device, where the forwarding and migration request carries the indication information.
In one possible design, the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
In one possible design, the method further comprises: the device comprises a receiving module and a releasing module;
the receiving module is used for receiving an interface release request message sent by the CS domain core network device;
and the release module is used for releasing the interface of the terminal between the terminal and the CS domain core network equipment according to the interface release request message.
In a fifth aspect, the present application provides a core network device, where the core network device includes a processor and a memory, where the memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the first aspect of the present application.
In a sixth aspect, the present application provides a core network device, where the core network device includes a processor and a memory, where the memory is used to store a program, and the processor calls the program stored in the memory to execute the method provided in the second aspect of the present application.
In a seventh aspect, the present application provides a core network device comprising at least one processing element (or chip) for performing the method of the first aspect above.
In an eighth aspect, the present application provides a core network device comprising at least one processing element (or chip) for performing the method of the first aspect above.
In a ninth aspect, the present application provides a computer storage medium comprising a program for performing the method of the above first aspect.
In a tenth aspect, the present application provides a computer storage medium comprising a program for performing the method of the second aspect above.
In the network changing method of the terminal and the core network device provided by the application, the first core network device receives the indication information from the second core network device, learns that the terminal is a CSFB user through the indication information, and then sends the location updating message to the CS domain core network device by the first core network device so as to indicate the CS domain core network device to update the location of the terminal. The first core network device belongs to a first network, the second core network device belongs to a second network, and the position of the terminal is moved from the second network to the first network. The method and the device realize that the terminal can be indicated to the first core network equipment as the CSFB user to support the CSFB service flow under the condition that the terminal is moved from the second network to the first network.
Drawings
Fig. 1 is a schematic diagram of a communication system architecture provided in the present application;
fig. 2 is a schematic flowchart of a network changing method of a terminal according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a network changing method of a terminal according to another embodiment of the present application;
fig. 4 is a schematic flowchart of a network changing method of a terminal according to another embodiment of the present application;
fig. 5 is a schematic flowchart of a network changing method of a terminal according to another embodiment of the present application;
fig. 6 is a flowchart illustrating a network changing method of a terminal according to yet another embodiment of the present application;
fig. 7 is a schematic structural diagram of a core network device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a core network device according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a core network device according to another embodiment of the present application;
fig. 10 is a schematic structural diagram of a core network device according to yet another embodiment of the present application;
fig. 11 is a schematic structural diagram of a core network device according to yet another embodiment of the present application.
Detailed Description
Fig. 1 is a schematic diagram of a communication system architecture provided in the present application. The communication system may comprise a plurality of different networks, e.g. 2G, 3G, 4G, 5G co-exist, i.e. the terminal may switch or reselect between the different networks. Fig. 1 illustrates an example of 4G and 5G, and as shown in fig. 1, the system may include: the terminal 01, the 5G core network device 02 and the 4G core network device 03.
In the embodiment of the present application, the Terminal (Terminal device) includes, but is not limited to, a Mobile Station (MS), a Mobile Terminal (Mobile Terminal), a Mobile phone (Mobile phone), a handset (handset), a portable device (portable equipment), and the like, and the Terminal may communicate with one or more core networks through a Radio Access Network (RAN), for example, the Terminal may be a Mobile phone (or referred to as a "cellular" phone), a computer with a wireless communication function, and the Terminal may also be a portable, pocket, hand-held, computer-embedded, or vehicle-mounted Mobile device or apparatus.
The 5G core network device 02 may include: access and Mobility Management Function (AMF), Session Manager Function (SMF), etc.
The 4G core network device 03 may include: mobility Management Entity (MME).
The system can also comprise: a CS domain core network device. The CS domain core network device may be a 2G core network device or a 3G core network device.
Further, the CS domain core network device may include: a Mobile Switching Center (MSC) and/or a Visitor Location Register (VLR).
The CS domain core network device may establish an interface with the 4G core network device, so that the 4G core network device may interact information with the 2G core network device/3G core network device, and thus the terminal may directly fall back from the 4G network to the 2G/3G network, which is not limited herein.
In the embodiment provided by the application, the 5G core network device may also directly establish a communication interface with the CS domain core network device, so that the 5G core network device may interact information with the 2G core network device/3G core network device, and thus the terminal may directly fall back to the 2G/3G network from the 5G network.
In particular, this communication interface may be used for mobility management between the CS domain and a 5G core network (core) of a Next Generation (NG) network.
In another aspect, the present application provides a method for indicating that a terminal is a CSFB user in a handover/reselection process of the terminal between a 5G network and a 4G network.
Fig. 2 is a schematic flow chart of a network changing method of a terminal according to an embodiment of the present application, and as shown in fig. 2, the method includes:
s201, the second core network equipment sends indication information. The indication information is used for indicating that the terminal is a CSFB user.
S202, the first core network device receives indication information from the second core network device.
The first core network device belongs to a first network, and the second core network device belongs to a second network. The location of the terminal is moved from the second network to the first network.
It should be noted that, in the above scenario, the terminal is previously accessed to the second network, and currently moves to the coverage of the first network, and needs to access the first network.
Alternatively, the terminal may reselect to the first network in an idle state or may switch to the first network in a connected state, which is not limited herein.
S203, the first core network device sends a location update message to the CS domain core network device, where the location update message is used to instruct the CS domain core network device to update the location of the terminal.
Specifically, both the 2G network and the 3G network can process voice services, and if the system includes a 2G core network device, the location update message is sent to the 2G core network device, and if the system includes a 3G core network device, the location update message is sent to the 3G core network device.
Optionally, after the terminal accesses the first core network device, the first core network device may initiate a combined location area update, so as to notify the MSC/VLR to update the location of the terminal. In addition, after the MSC/VLR updates the location of the terminal, it may initiate interface reestablishment, for example, when the terminal is switched from the 4G network to the 5G network, the MSC/VLR notifies the 4G core network device to release the interface (Gs interface) of the terminal with the CS core network device, and further notifies the 5G core network device to establish the interface of the terminal with the CS core network device.
In one implementation, a first core network device receives an interface establishment REQUEST (ALERT-REQUEST) message sent by a CS domain core network device, and a first terminal establishes an interface with the CS domain core network device according to the interface establishment REQUEST message. After the establishment is completed, the terminal can fall back to the 2G network/3G network directly from the first network through this interface.
Similarly, the second core network device receives a RELEASE-REQUEST message sent by the CS domain core network device, and RELEASEs the interface of the terminal with the CS domain core network device according to the RELEASE-REQUEST message.
In this embodiment, the first core network device receives the indication information from the second core network device, learns that the terminal is a CSFB user through the indication information, and then sends a location update message to the CS domain core network device to indicate the CS domain core network device to update the location of the terminal. The first core network device belongs to a first network, the second core network device belongs to a second network, and the position of the terminal is moved from the second network to the first network. The method and the device realize that the terminal can be indicated to the first core network equipment as the CSFB user to support the CSFB service flow under the condition that the terminal is moved from the second network to the first network.
In one possible implementation, the first core network device is a 4G core network device, and the second core network device is a 5G core network device. I.e. the terminal moves from the 5G network to the 4G network.
Specifically, the terminal may reselect to the 4G network in an IDLE (IDLE) state, in this scenario, the 5G core network device does not know that the terminal has moved, the terminal may initiate Tracking Area Update (TAU) after reselecting to the 4G network, and then the 4G core network device may actively request the 5G core network device for CSFB-related information of the terminal.
Fig. 3 is a schematic flowchart of a network changing method of a terminal according to another embodiment of the present application. Taking the case that the terminal reselects from the 5G network to the 4G network, the first core network device is an MME, and the second core network device is an AMF. As shown in fig. 3, the method includes:
s301, after the terminal reselects to the 4G network, sending a TAU request to the MME. The TAU request includes: a joint tracking area update indication.
S302, after receiving the TAU request, the MME sends a context request message (context request) to the AMF. The context request is used to request information indicating that the terminal is a CSFB user.
S303, the AMF sends a context response (context response) to the MME according to the context request message, where the context response carries the indication information.
That is, in this embodiment, the indication information is carried in the context response to indicate that the terminal is a CSFB user.
Optionally, after receiving the context response, the MME performs an authentication/encryption procedure and replies a context acknowledgement message. Then, the MME initiates a session establishment request to a Serving Gateway (SGW), and the SGW and a Packet Data Gateway (PDN Gateway, PGW) perform a bearer establishment or modification process according to the received bearer related parameters.
And then the MME initiates a process of location deletion and the like to the AMF, so that location information of the terminal is deleted between the AMF, the SMF and a Unified Data Management entity (UDM), and unnecessary interfaces, such as an interface between a 5G network and a 2G/3G network, are released.
Optionally, after receiving the context response, the MME may reply to the AMF with an acknowledgement message (ACK) to indicate that the context response is received.
S304, the MME sends a cancel location (cancel location) request to the AMF.
S305, the AMF notifies a Unified Data Management entity (UDM) to delete the location information of the terminal.
Optionally, the SMF and the UPF also delete the related information of the terminal and release the session
S306, the MME sends a position updating message to the CS domain core network equipment.
Specifically, the MME initiates a joint location area update to the MSC or VLR.
And the CS domain core network equipment releases the interface of the terminal with the 5G core network equipment and initiates establishment of a Gs interface of the terminal with the 4G core network.
In addition, the CS domain core network device also updates the location information of the terminal.
In yet another possible embodiment, the terminal reselects from the 4G network to the 5G network in an IDLE (IDLE) state. In this case, after the terminal reselects to the 5G network, it initiates a Registration Area Update (RAU), and the 5G core network device requests the CSFB related information of the terminal from the 4G core network device.
Fig. 4 is a flowchart illustrating a network changing method of a terminal according to another embodiment of the present application. Taking the case that the terminal reselects from the 4G network to the 5G network, the first core network device is an AMF, and the second core network device is an MME. As shown in fig. 4, the method includes:
and S401, after the terminal reselects to the 5G network, sending an RAU request to the AMF. The RAU request includes: federated registration area update indication
S402, after receiving the RAU request, the AMF sends a context request message to the MME.
S403, the MME sends a context response to the AMF according to the context request message, and the context response carries the indication information.
That is, in this embodiment, the indication information is carried in the context response to indicate that the terminal is a CSFB user.
After receiving the context response, the AMF optionally performs an authentication/encryption process and replies a context acknowledgement message. The 5G core network device (including AMF, SMF, User Plane Function (UPF) for transferring User plane data, etc.) and the HSS/UDM perform the session establishment procedure and the procedures of bearer establishment/modification, etc.
S404, the AMF sends a cancel location (cancel location) request to the MME.
S405, the MME deletes the position information of the terminal.
Optionally, the MME and the HSS delete the location information of the terminal.
In addition, S-GW and P-GW also delete the relevant information of the terminal and release the conversation
S406, the AMF sends a location updating message to the CS domain core network device.
Specifically, the AMF initiates a combined location area update to the MSC or VLR.
And the CS domain core network equipment releases the Gs interface of the terminal between the CS domain core network equipment and the 4G core network equipment and initiates the establishment of the interface of the terminal between the CS domain core network equipment and the 5G core network.
In addition, the CS domain core network device also updates the location information of the terminal.
Based on the embodiments shown in fig. 3 and 4, the indication information includes one or more of the following items: old (old) Location Area Identity (LAI), CS domain selection information (selected CS domain) and terminal configuration information (Voice domain prediction and UE's usage setting), VLR Temporary Mobile Subscriber Identity (TMSI).
Wherein, old LAI represents the LAI when the terminal originally accesses the network. For example, the terminal reselects from the 4G network to the 5G network, and old LAI represents the LAI of the terminal when the terminal originally accesses the 4G network.
Further, when the terminal is accessed to the second network and is in a connected state, handover may also occur, and the terminal is accessed to the first network through a handover process. In this case, the manner of indicating that the terminal is a CSFB user may be different.
Optionally, the indication information is carried by a forward migration request (forward relocation request).
That is, the first core network device receiving the indication information from the second core network device may be: and the first core network equipment receives a forwarding and transferring request from the second core network equipment, wherein the forwarding and transferring request carries the indication information.
Fig. 5 is a flowchart illustrating a network changing method of a terminal according to another embodiment of the present application. Taking the example that the terminal is switched from the 5G network to the 4G network, the first core network device is an MME, and the second core network device is an AMF. As shown in fig. 5, the method includes:
s501, the AMF sends a forwarding and migrating request to the MME, and the forwarding and migrating request carries indication information.
The indication information indicates that the terminal is a CSFB subscriber.
When the terminal is switched to other networks in a connection state, the second core network device knows that the terminal needs to be switched, and will actively send a forwarding migration request to the first core network device.
Next, the network side device performs an inter-system handover procedure, and the specific procedure is not limited herein, for example, the inter-system handover procedure using the 23.502 protocol may be adopted. And after the inter-system switching process is executed, the terminal is switched to the 4G network.
And S502, after the terminal is switched to the 4G network, sending a TAU request to the MME.
It should be noted that, different from the foregoing embodiment, the present embodiment has already performed the handover procedure, and the AMF also sends the indication information to the MME, so that the TAU request may not carry the old (old) Location Area Identity (LAI), and the context interaction procedure does not need to be performed.
S503, the MME sends a location update message to the CS domain core network device.
Specifically, the MME initiates a joint location area update to the MSC or VLR. The MME itself also updates the location information of the terminal.
And the CS domain core network equipment releases the interface of the terminal with the 5G core network equipment and initiates establishment of a Gs interface of the terminal with the 4G core network.
In addition, the CS domain core network device also updates the location information of the terminal.
Fig. 6 is a flowchart illustrating a network changing method of a terminal according to still another embodiment of the present application. Taking the example that the terminal is switched from the 4G network to the 5G network, the first core network device is an AMF, and the second core network device is an MME. As shown in fig. 6, the method includes:
s601, MME sends a forwarding and migrating request to AMF, and the forwarding and migrating request carries indication information.
The indication information indicates that the terminal is a CSFB subscriber.
When the terminal is switched to other networks in a connection state, the second core network device knows that the terminal needs to be switched, and will actively send a forwarding migration request to the first core network device.
Next, the network side device performs an inter-system handover procedure, and the specific procedure is not limited herein, for example, the inter-system handover procedure using the 23.502 protocol may be adopted. And after the inter-system switching process is executed, the terminal is switched to the 5G network.
And S602, after the terminal is switched to the 5G network, the terminal sends an RAU request to the AMF.
It should be noted that, different from the foregoing embodiment, the present embodiment already performs the handover procedure, and the MME also sends the indication information to the AMF, so that the RAU request may not carry the old (old) Location Area Identity (LAI), and the context interaction procedure does not need to be performed.
S603, the AMF sends a location updating message to the CS domain core network device.
Specifically, the AMF initiates a combined location area update to the MSC or VLR. The AMF itself also updates the location information of the terminal.
And the CS domain core network equipment releases the Gs interface of the terminal between the CS domain core network equipment and the 4G core network equipment and initiates the establishment of the interface of the terminal between the CS domain core network equipment and the 5G core network.
In addition, the CS domain core network device also updates the location information of the terminal.
According to the embodiments shown in fig. 5 and 6, the indication information includes one or more of the following items: CSFB identification (CSFB indication), old lai (old lai), CS domain selection information, and terminal configuration information (Voice domain prediction and UE's usage setting).
Wherein, old LAI represents the LAI when the terminal originally accesses the network. For example, the terminal is switched from the 4G network to the 5G network, and old LAI represents the LAI when the terminal originally accesses the 4G network.
Through the embodiment, the terminal can be indicated as a CSFB user when moving between the 4G network and the 5G network, and the CSFB related information is transmitted to support a CSFB flow. Meanwhile, an interface between the 5G network and the 2G/3G network can be established, so that the CSFB process can be directly carried out between the 5G network and the 2G/3G network.
Fig. 7 is a schematic structural diagram of a core network device according to an embodiment of the present application, where the core network may be the first core network device.
As shown in fig. 7, the core network device includes: a receiving module 701 and a transmitting module 702, wherein:
a receiving module 701, configured to receive indication information from a second core network device, where the indication information is used to indicate that a terminal is a CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network.
A sending module 702, configured to send a location update message to a CS domain core network device, where the location update message is used to instruct the CS domain core network device to update a location of the terminal.
On the basis of the foregoing embodiment, in an implementation manner, the first core network device is a 4G core network device, and the second core network device is a 5G core network device.
The receiving module 701 is further configured to receive a tracking area update TAU request from the terminal, where the TAU request includes a joint tracking area update indication. Accordingly, the number of the first and second electrodes,
the sending module 702 is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
In another embodiment, the first core network device is a 5G core network device, and the second core network device is a 4G core network device.
The receiving module 701 is further configured to receive a registration area update RAU request from the terminal, where the RAU request includes a joint registration area update indication. Accordingly, the number of the first and second electrodes,
the sending module 702 is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
The receiving module 701 is specifically configured to receive a context response message from the second core network device, where the context response message carries the indication information.
The indication information comprises one or more of the following items: old LAI, CS domain selection information and terminal configuration information, VLR TMSI.
In another embodiment, the receiving module 701 is specifically configured to receive a forwarding and migrating request from a second core network device, where the forwarding and migrating request carries the indication information.
The indication information includes one or more of: CSFB identification, old LAI, CS domain selection information and terminal configuration information.
Fig. 8 is a schematic structural diagram of a core network device according to an embodiment of the present application, and based on fig. 7, as shown in fig. 8, the core network device further includes: a module 801 is established.
Specifically, the receiving module 701 is further configured to receive an interface establishment request message sent by the CS domain core network device.
An establishing module 801, configured to establish an interface of the terminal with the CS domain core network device according to the interface establishment request message.
Fig. 9 is a schematic structural diagram of a core network device according to another embodiment of the present application. The core network device may be the second core network device, as shown in fig. 9, and the core network device includes: a sending module 901, configured to send indication information to a first core network device, where the indication information is used to indicate that a terminal is a CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network.
Further, referring to fig. 9, the core network device may further include a receiving module 902.
In one implementation manner, the first core network device is a 4G core network device, and the second core network device is a 5G core network device.
A receiving module 902, configured to receive a context request message sent by the first core network device after receiving a tracking area update TAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
In another implementation manner, the first core network device is a 5G core network device, and the second core network device is a 4G core network device.
A receiving module 902, configured to receive a context request message sent by the first core network device after receiving a registration area update RAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
Correspondingly, the sending module 901 is specifically configured to send a context response message to the first core network device, where the context response message carries the indication information.
The indication information comprises one or more of the following items: old LAI, CS domain selection information and terminal configuration information, VLR TMSI.
Optionally, in another embodiment, the sending module 901 is specifically configured to send a forwarding and migrating request to the first core network device, where the forwarding and migrating request carries the indication information.
The indication information comprises one or more of the following items: CSFB identification, old LAI, CS domain selection information and terminal configuration information.
Fig. 10 is a schematic structural diagram of a core network device according to another embodiment of the present application, as shown in fig. 10, on the basis of fig. 9, the core network device may further include: and releasing the module 903.
A receiving module 902, configured to receive an interface release request message sent by a CS domain core network device.
A releasing module 903, configured to release the interface of the terminal with the CS domain core network device according to the interface release request message.
The device is used for executing the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.
It should be noted that the division of the modules of the above apparatus is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the releasing module may be a processing element that is set up separately, or may be implemented by being integrated into a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the releasing module may be called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.
For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when some of the above modules are implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can invoke the program code. As another example, these modules may be integrated together, implemented in the form of a system-on-a-chip (SOC).
Fig. 11 is a schematic structural diagram of a core network device according to still another embodiment of the present application, where the core network device may be the first core network device or the second core network device. As shown in fig. 11, the core network device includes: a memory 10 and a processor 11.
The memory 10 may be a separate physical unit, and may be connected to the processor 11 via a bus. The memory 10 and the processor 11 may also be integrated, implemented by hardware, etc.
The memory 10 is used for storing a program implementing the above method embodiment, or each module of the embodiments shown in fig. 7-10, and the processor 11 calls the program to execute the operation of the above method embodiment.
For example, when the core network device is a first core network device, the processor 11 is configured to receive indication information from a second core network device, where the indication information is used to indicate that a terminal is a CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network; and sending a position updating message to the CS domain core network equipment, wherein the position updating message is used for indicating the CS domain core network equipment to update the position of the terminal.
When the core network device is a second core network device, the processor 11 is configured to send indication information to the first core network device, where the indication information is used to indicate that the terminal is a circuit switched fallback CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and the location of the terminal is moved from the second network to the first network.
The core network device may further include a receiver and a transmitter, where the receiver performs receiving under the control of the processor, and the transmitter performs transmitting under the control of the processor, and the like, and the present application is not limited thereto.
Alternatively, when part or all of the random access method of the foregoing embodiments is implemented by software, the core network device may only include a processor. The memory for storing the program is located outside the core network device, and the processor is connected with the memory through a circuit/wire and is used for reading and executing the program stored in the memory.
The processor may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
The memory may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile memory), such as a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory may also comprise a combination of memories of the kind described above.
The embodiment of the application also provides a computer storage medium, which stores a computer program, and the computer program is used for executing the network changing method of the terminal provided by the embodiment.
The embodiment of the present application further provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the network changing method of the terminal provided by the above embodiment.
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, 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, 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.
The present application is 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.
Claims (28)
1. A network change method of a terminal is characterized by comprising the following steps:
a first core network device receives indication information from a second core network device, where the indication information is used to indicate that a terminal is a circuit switched domain fallback (CSFB) user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network;
the first core network device sends a location update message to a Circuit Switching (CS) domain core network device, wherein the location update message is used for indicating the CS domain core network device to update the location of the terminal;
after the first core network device sends the location update message to the CS domain core network device, the method further includes:
the first core network equipment receives an interface establishment request message sent by the CS domain core network equipment;
and the first core network equipment establishes an interface of the terminal with the CS domain core network equipment according to the interface establishment request message.
2. The method according to claim 1, wherein the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
before the first core network device receives the indication information from the second core network device, the method further includes:
the first core network equipment receives a tracking area update TAU request from the terminal, wherein the TAU request comprises a joint tracking area update instruction;
after receiving the TAU request, the first core network device sends a context request message to the second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
3. The method according to claim 1, wherein the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
before the first core network device receives the indication information from the second core network device, the method further includes:
the first core network equipment receives a registration area update RAU request from the terminal, wherein the RAU request comprises a joint registration area update instruction;
after receiving the RAU request, the first core network device sends a context request message to the second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
4. The method according to claim 2 or 3, wherein the first core network device receives indication information from a second core network device, and comprises:
and the first core network equipment receives a context response message from the second core network equipment, wherein the context response message carries the indication information.
5. The method of claim 2 or 3, wherein the indication information comprises one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
6. The method of claim 1, wherein the first core network device receives indication information from a second core network device, and wherein the indication information comprises:
and the first core network equipment receives a forwarding and transferring request from second core network equipment, wherein the forwarding and transferring request carries the indication information.
7. The method of claim 6, wherein the indication information comprises one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
8. A network change method of a terminal is characterized by comprising the following steps:
the method comprises the steps that a second core network device sends indication information to a first core network device, wherein the indication information is used for indicating that a terminal is information of a Circuit Switched Fallback (CSFB) user, the first core network device belongs to a first network, the second core network device belongs to a second network, and the position of the terminal is moved to the first network from the second network;
the method further comprises the following steps:
the second core network equipment receives an interface release request message sent by the CS domain core network equipment;
and the second core network equipment releases the interface of the terminal between the second core network equipment and the CS domain core network equipment according to the interface release request message.
9. The method according to claim 8, wherein the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
before the second core network device sends the indication information to the first core network device, the method further includes:
and the second core network device receives a context request message sent by the first core network device after receiving a tracking area update TAU request, wherein the context request message is used for requesting information indicating that the terminal is a CSFB user.
10. The method according to claim 8, wherein the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
before the second core network device sends the indication information to the first core network device, the method further includes:
the second core network device receives a context request message sent by the first core network device after receiving a registration area update RAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
11. The method according to claim 9 or 10, wherein the sending, by the second core network device, the indication information to the first core network device includes:
and the second core network equipment sends a context response message to the first core network equipment, wherein the context response message carries the indication information.
12. The method according to claim 9 or 10, wherein the indication information comprises one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
13. The method of claim 8, wherein the sending, by the second core network device, the indication information to the first core network device comprises:
and the second core network equipment sends a forwarding and migrating request to the first core network equipment, wherein the forwarding and migrating request carries the indication information.
14. The method of claim 13, wherein the indication information comprises one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
15. A core network device, wherein the core network device is a first core network device, comprising:
a receiving module, configured to receive indication information from a second core network device, where the indication information is used to indicate that a terminal is a circuit switched domain fallback CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network;
a sending module, configured to send a location update message to a CS domain core network device, where the location update message is used to instruct the CS domain core network device to update a location of the terminal;
further comprising: establishing a module;
the receiving module is further configured to receive an interface establishment request message sent by the CS domain core network device;
the establishing module is configured to establish an interface of the terminal with the CS domain core network device according to the interface establishment request message.
16. The core network device according to claim 15, wherein the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
the receiving module is further configured to receive a tracking area update TAU request from the terminal, where the TAU request includes a joint tracking area update indication;
the sending module is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
17. The core network device according to claim 15, wherein the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
the receiving module is further configured to receive a registration area update RAU request from the terminal, where the RAU request includes a joint registration area update indication;
the sending module is further configured to send a context request message to a second core network device, where the context request message is used to request information indicating that the terminal is a CSFB user.
18. The core network device according to claim 16 or 17, wherein the receiving module is specifically configured to receive a context response message from the second core network device, where the context response message carries the indication information.
19. Core network device according to claim 16 or 17, wherein the indication information comprises one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
20. The core network device according to claim 15, wherein the receiving module is specifically configured to receive a forwarding and migration request from a second core network device, where the forwarding and migration request carries the indication information.
21. The core network device of claim 20, wherein the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
22. A core network device, wherein the core network device is a second core network device, comprising:
a sending module, configured to send indication information to a first core network device, where the indication information is used to indicate that a terminal is a circuit switched fallback CSFB user, where the first core network device belongs to a first network, the second core network device belongs to a second network, and a location of the terminal is moved from the second network to the first network;
further comprising: the device comprises a receiving module and a releasing module;
the receiving module is used for receiving an interface release request message sent by the CS domain core network device;
and the release module is used for releasing the interface of the terminal between the terminal and the CS domain core network equipment according to the interface release request message.
23. The core network device according to claim 22, wherein the first core network device is a 4G core network device, and the second core network device is a 5G core network device;
the core network device further includes: a receiving module, configured to receive a context request message sent by the first core network device after receiving a tracking area update TAU request, where the context request message is used to request information indicating that the terminal is a CSFB user.
24. The core network device according to claim 22, wherein the first core network device is a 5G core network device, and the second core network device is a 4G core network device;
the core network device further includes: a receiving module, configured to receive a context request message sent by the first core network device after receiving a registration area RAU update request, where the context request message is used to request information indicating that the terminal is a CSFB user.
25. The core network device according to claim 23 or 24, wherein the sending module is specifically configured to send a context response message to the first core network device, where the context response message carries the indication information.
26. Core network device according to claim 23 or 24, wherein the indication information comprises one or more of:
the old location area identification code LAI, CS domain selection information and terminal configuration information, and the temporary mobile subscriber identity TMSI of the visitor location register VLR.
27. The core network device according to claim 22, wherein the sending module is specifically configured to send a forwarding and migration request to the first core network device, where the forwarding and migration request carries the indication information.
28. The core network device of claim 27, wherein the indication information includes one or more of:
CSFB identification, old LAI, CS domain selection information and terminal configuration information.
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| CN117768856A (en) * | 2022-09-26 | 2024-03-26 | 荣耀终端有限公司 | Network fallback method, device and storage medium |
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