Communication method and device

Abstract

The invention provides a communication method and device. The method comprises: in a process of registering to a first network, a communication device obtains first information, the first information comprising an identifier of a first AMF in the first network; the communication device obtains second information, wherein the second information is used for indicating the communication device to enter a multi-connection state; and the communication device sends first information to the second network in a process of registering to the second network according to the second information, and the first information is used for the second AMF in the second network to determine the first AMF. According to the embodiment of the invention, in a multi-connection scene, the communication device can send the identifier of the first AMF to the second network in a process of registering to the second network, so that the second AMF can determine the first AMF according to the identifier of the first AMF and further establish a connection with the first AMF, and the first AMF and the second AMF perform cooperative management on the mobility of the communication device.

Description

Technical Field

[0001] The present application relates to the field of communications, and more specifically, to a communication method and device. Background Art

[0002] In a multi-connection scenario, a terminal device can access multiple different networks. Taking dual connection as an example, a terminal device can access two networks at the same time. Currently, the two networks to which the terminal device accesses manage the mobility of the terminal device independently. In this management mode, the two networks may not coordinate the management of the mobility of the terminal device. Therefore, how to enable multiple networks to coordinate the management of the mobility of the terminal device in a multi-connection scenario is a problem that needs to be solved. Summary of the invention

[0003] The present application provides a communication method and apparatus for collaboratively managing the mobility of a terminal device by multiple networks in a multi-connection scenario.

[0004] In a first aspect, a communication method is provided, the method comprising:

[0005] During the process of registering with a first network, the communication device obtains first information, where the first information includes an identifier of a first access and mobility management network element in the first network; the communication device obtains second information, where the second information is used to indicate that the communication device enters a multi-connection state; and based on the second information, during the process of registering with a second network, the communication device sends the first information to the second network, where the first information is used by a second access and mobility management network element in the second network to determine the first access and mobility management network element.

[0006] As an optional manner, the communication device sends the first information to the second network, which may also implicitly indicate that the communication device enters a multi-connection state. The communication device may be a terminal device or a chip in the terminal device.

[0007] According to an embodiment of the present application, in a multi-connection scenario, the terminal device can send the identifier of the first access and mobility management network element in the first network to the second network during the process of registering to the second network, so that the access and mobility management network element in the second network can determine the first access and mobility management network element in the first network according to the identifier of the first access and mobility management network element, and then establish a connection with the first access and mobility management network element, thereby realizing the collaborative management of the mobility of the terminal device by the first access and mobility management network element and the second access and mobility management network element in the second network.

[0008] In combination with the first aspect, in certain implementations of the first aspect, the first information is the 5G-Globally Unique Temporary Identifier (GUTI) corresponding to the first access and mobility management network element, or the Globally Unique AMF Identifier (GUAMI) corresponding to the first access and mobility management network element.

[0009] It can be understood that 5G-GUTI includes GUAMI and 5G-Temporary Mobile User Identity (TMSI). Further, GUAMI includes Mobile Country Code (MCC), Mobile Network Code (MNC) and AMF ID. Among them, 5G-TMSI is a temporary identifier of the terminal device. MCC and MNC are identifiers of the Public Land Mobile Network (PLMN), and AMF ID is the identifier of AMF.

[0010] In combination with the first aspect, in some implementations of the first aspect, the communication device acquires the first information during registration with the first network, including:

[0011] During the process of registering to the first network, the communication device receives a registration acceptance message from the first access and mobility management network element, and the registration acceptance message includes the 5G-GUTI corresponding to the first access and mobility management network element.

[0012] In combination with the first aspect, in some implementations of the first aspect, the registration acceptance message also includes a GUAMI corresponding to the first access and mobility management network element.

[0013] In combination with the first aspect, in some implementations of the first aspect, the communication device obtains the second information, including:

[0014] The communication device obtains the second information based on an operation instruction of a user; or, the communication device obtains the second information from the first access and mobility management network element.

[0015] In combination with the first aspect, in some implementations of the first aspect, the method further includes:

[0016] The communication device sends the second information to the second network.

[0017] In combination with the first aspect, in some implementations of the first aspect, when the communication device enters the mobility restriction area of ​​the first network but does not enter the mobility restriction area of ​​the second network, the method further includes:

[0018] The communication device receives a deregistration request message from the second access and mobility management network element;

[0019] The communication device sends a deregistration acceptance message to the second access and mobility management network element according to the deregistration request message, and releases the signal connection with the access network device in the second network.

[0020] In combination with the first aspect, in some implementations of the first aspect, the deregistration request message also includes reason information for deregistering the communication device, and the reason information indicates that the communication device enters a mobility restriction area of ​​the first network.

[0021] In a second aspect, a communication method is provided, the method being applied in a scenario where a communication device accesses a first network and a second network, the first network including a first network element, the method including:

[0022] The first network element determines whether the communication device enters the mobility restriction area of ​​the first network; when the communication device enters the mobility restriction area of ​​the first network, the first network element sends third information to the second network, and the third information is used to instruct the second network to stop providing services to the communication device, and the state of the communication device in the first network is a state of stopping obtaining services.

[0023] According to an embodiment of the present application, in a multi-connection (for example, dual connection) scenario, if a terminal device enters a mobility restriction area of ​​a first network, a first network element in the first network sends a third information to a second network to instruct the second network to stop providing services to the terminal device, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the first network and the second network on the terminal device remain consistent.

[0024] In the present application, as a method, a device in the second network can deregister the terminal device according to the third information. The terminal device is also in a deregistered state in the first network, so that the mobility restrictions on the terminal device in the first network and the second network are consistent. Exemplarily, the device in the second network can send a deregistration request message to the terminal device. Optionally, the deregistration request message can also include a reason for deregistering the terminal device, which is that the terminal device enters the mobility restriction area of ​​the first network. It can be understood that in the process of deregistering the terminal device, the device in the second network can release the session with the terminal device and stop information interaction with the terminal device.

[0025] As another way, the terminal device can still maintain the registration state. The device in the second network can restrict the terminal device from establishing a session and restrict the terminal device from obtaining related services according to the third information. The device in the second network can release all sessions of the terminal device according to the third information. The device in the second network can stop exchanging other information with the terminal device except information related to mobility according to the third information.

[0026] In addition, optionally, the device in the second network can also update the mobility restriction area list of the terminal device in the second network based on the third information, and the updated mobility restriction area list of the terminal device in the second network includes the first area, which is the area where the terminal device is currently located.

[0027] In combination with the second aspect, in some implementations of the second aspect, the first network element is a first access and mobility management network element, and the method further includes:

[0028] The first network element receives second information and fourth information from a second access and mobility management network element in the second network, the second information being used to indicate that the communication device is in a multi-connection state, and the fourth information including an identifier of the second access and mobility management network element.

[0029] In combination with the second aspect, in some implementations of the second aspect, the fourth information is the 5G-GUTI corresponding to the second access and mobility management network element, or the GUAMI corresponding to the second access and mobility management network element.

[0030] In conjunction with the second aspect, in some implementations of the second aspect, the first network element is a unified data management network element, and the method further includes:

[0031] During the process of the communication device registering with the first network, the first network element obtains first information from a first access and mobility management network element in the first network, and the first information includes an identifier of the first access and mobility management network element; during the process of the communication device registering with the second network, the first network element obtains second information and fourth information from a second access and mobility management network element in the second network, and the second information is used to indicate that the communication device is in a multi-connection state, and the fourth information includes an identifier of the second access and mobility management network element.

[0032] In combination with the second aspect, in certain implementations of the second aspect, the first information is the 5G-GUTI corresponding to the first access and mobility management network element, or the GUAMI corresponding to the first access and mobility management network element; the fourth information is the 5G-GUTI corresponding to the second access and mobility management network element, or the GUAMI corresponding to the second access and mobility management network element.

[0033] In combination with the second aspect, in certain implementations of the second aspect, the first network is the home network of the terminal device, and the second network is the visited network of the terminal device; or, the first network is the first visited network of the terminal device, and the second network is the second visited network of the terminal device.

[0034] It can be understood that the first visited network is a primary visited network, and the second visited network is a secondary visited network. As a way, the priority of the visited network can be configured by the home network, and the priority of the primary visited network is higher than that of the secondary visited network.

[0035] As a situation, if the first network is a home network and the second network is a roaming network, since the contract data of the terminal device is in the first network and the second network is a network accessed by the terminal device using the contract data of the first network for roaming, the contract data of the terminal device includes the contract service of the terminal device. Therefore, when the first network and the second network jointly manage the mobility of the terminal device, it is more reasonable to give priority to the first network (that is, if the terminal device enters the mobility restriction area of ​​the first network but does not enter the mobility restriction area of ​​the second network, the terminal device stops obtaining the contract service in the second network).

[0036] As another case, if the first network is the primary visited network and the second network is the secondary visited network, the priority of the primary visited network is higher than that of the secondary visited network. Therefore, when the first network and the second network jointly manage the mobility of the terminal device, it is more reasonable to give priority to the first network.

[0037] In conjunction with the second aspect, in some implementations of the second aspect, the third information is used to indicate one or more of the following:

[0038] Instruct the terminal device to enter the mobility restriction area of ​​the first network; instruct the terminal device to be deregistered; instruct the release of all sessions of the terminal device; instruct the cessation of information interaction with the terminal device; instruct the update of the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0039] In combination with the second aspect, in some implementations of the second aspect, the first network element is a first access and mobility management network element; and the first network element determines whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0040] The first network element receives a mobility registration update request message from the terminal device; the first network element determines whether the terminal device enters a mobility restriction area of ​​the first network according to the mobility registration update request message.

[0041] The first network element sending the third information to the second network includes:

[0042] The first network element sends the third information to a second access and mobility management network element in the second network.

[0043] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0044] The first network element obtains first configuration information, and the first configuration information is used to instruct the first network element: if the terminal device enters the mobility restriction area of ​​the first network, the first network element sends the third information to the second access and mobility management network element; or, the first network element receives a first subscription message from the second access and mobility management network element, and the first subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the first network, the first network element sends the third information to the second access and mobility management network element; or, the first network element receives first policy update information from the first policy control network element, and updates the local policy of the first network element according to the first policy update information, and the local policy of the first network element after the update is: if the terminal device enters the mobility restriction area of ​​the first network, the first network element sends the third information to the second access and mobility management network element; wherein, the first network includes the first policy control network element.

[0045] In combination with the second aspect, in some implementations of the second aspect, the first network element is a unified data management network element; and the first network element determines whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0046] The first network element receives a notification message from a first access and mobility management network element, wherein the notification message indicates that the terminal device enters a mobility restriction area of ​​the first network; the first network element determines, based on the notification message, that the terminal device enters the mobility restriction area of ​​the first network.

[0047] The first network element sending third information to the second network includes:

[0048] The first network element sends the third information to a second access and mobility management network element in the second network.

[0049] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0050] The first network element sends a first subscription message to the first access and mobility management network element, and the first subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; or, the first network element sends a first indication message to the first policy control network element, and the first indication message is used to instruct the first policy control network element to update the local policy of the first access and mobility management network element. After the update, the local policy of the first access and mobility management network element is: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element, and the first network includes the first policy control network element.

[0051] In combination with the second aspect, in some implementations of the second aspect, the first network element is a first policy control network element; and the first network element determines whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0052] The first network element receives a notification message from a first access and mobility management network element, wherein the notification message indicates that the terminal device enters a mobility restriction area of ​​the first network; the first network element determines, based on the notification message, that the terminal device enters the mobility restriction area of ​​the first network.

[0053] The first network element sending third information to the second network includes:

[0054] The first network element sends the third information to a second policy control network element in the second network.

[0055] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0056] The first network element sends a first subscription message to the first access and mobility management network element, and the first subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; or, the first network element sends first policy update information to the first access and mobility management network element, and the first policy update information is used to update the local policy of the first access and mobility management network element. After the update, the local policy of the first access and mobility management network element is: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element.

[0057] In combination with the second aspect, in some implementations of the second aspect, the first network element determines whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0058] The first network element receives fifth information from the second network, and the fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network; the first network element determines whether the terminal device enters the mobility restriction area of ​​the first network based on the fifth information.

[0059] In combination with the second aspect, in some implementations of the second aspect, the method further includes: when the terminal device does not enter the mobility restriction area of ​​the first network, the first network element sends sixth information to the second network, where the sixth information is used to indicate any one of the following:

[0060] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located.

[0061] According to an embodiment of the present application, in a multi-connection scenario, if the terminal device enters the mobility restriction area of ​​the second network, the first network element obtains the fifth information from the second network and sends the sixth information to the second network, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the terminal device by the first network and the second network remain consistent.

[0062] Specifically, if the terminal device enters the mobility restriction area of ​​the second network but does not enter the mobility restriction area of ​​the first network, the devices in the second network can provide services to the terminal device, and the devices in the first network can also provide services to the terminal device, so that the mobility restrictions of the first network and the second network on the terminal device remain consistent. In other words, neither the first network nor the second network imposes restrictions on the mobility of the terminal device.

[0063] In combination with the second aspect, in some implementations of the second aspect, the first network element is a first access and mobility management network element; and the first network element receives fifth information from the second network, including:

[0064] The first network element receives the fifth information from a second access and mobility management network element of a second network.

[0065] The first network element sends sixth information to the second network, including:

[0066] The first network element sends the sixth information to the second access and mobility management network element.

[0067] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0068] The first network element sends a second subscription message to the second access and mobility management network element, and the second subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element.

[0069] In combination with the second aspect, in some implementations of the second aspect, the first network element is a unified data management network element; and the first network element receives fifth information from the second network, including:

[0070] The first network element receives the fifth information from a second access and mobility management network element of the second network.

[0071] The first network element determines, according to the fifth information, whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0072] The first network element sends a query message to the first access and mobility management network element based on the fifth information, and the query message is used to query whether the terminal device has entered the mobility restriction area of ​​the first network; the first network element receives a response message to the query message from the first access and mobility management network element; the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on the response message. Alternatively, the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on whether a message related to the mobility update of the terminal device is received from the first access and mobility management network element. In other words, the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on whether a notification message is received from the first access and mobility management network element, and the notification message indicates that the terminal device has entered the mobility restriction area of ​​the first network.

[0073] The first network element sends sixth information to the second network, including:

[0074] The first network element sends sixth information to the second access and mobility management network element.

[0075] In conjunction with the second aspect, in some implementations of the second aspect, the method further includes:

[0076] The first network element sends a second subscription message to the second access and mobility management network element, and the second subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element; or, the first network element sends a second indication message to the second policy control network element, and the second indication message is used to instruct the second policy control network element to update the local policy of the second access and mobility management network element. After the update, the local policy of the second access and mobility management network element is: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element.

[0077] In combination with the second aspect, in some implementations of the second aspect, the first network element is a first policy control network element; and the first network element receives fifth information from the second network, including:

[0078] The first network element receives the fifth information from a second policy control network element of the second network.

[0079] The first network element determines, according to the fifth information, whether the terminal device enters a mobility restriction area of ​​the first network, including:

[0080] The first network element sends a query message to the first access and mobility management network element based on the fifth information, and the query message is used to query whether the terminal device has entered the mobility restriction area of ​​the first network; the first network element receives a response message to the query message from the first access and mobility management network element; the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on the response message. Alternatively, the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on whether a message related to the mobility update of the terminal device is received from the first access and mobility management network element. In other words, the first network element determines whether the terminal device has entered the mobility restriction area of ​​the first network based on whether a notification message is received from the first access and mobility management network element, and the notification message indicates that the terminal device has entered the mobility restriction area of ​​the first network.

[0081] The first network element sends sixth information to the second network, including:

[0082] The first network element sends sixth information to the second policy control network element.

[0083] In a third aspect, a communication method is provided, the method being applied to a scenario in which a terminal device accesses a first network and a second network, the first network including a first access and mobility management network element and a first network element, the method including:

[0084] The first access and mobility management network element receives a mobility registration update request message of the terminal device; the first access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the first network based on the mobility registration update request message; when the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends a notification message to the first network element, and the notification message indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0085] According to an embodiment of the present application, when a terminal device enters a mobility restricted area of ​​a first network, a first access and mobility management network element sends a notification message to the first network element, so that the first network element can be informed that the terminal device enters the mobility restricted area of ​​the first network, so that the first network element can manage the mobility of the terminal device.

[0086] In combination with the third aspect, in certain implementations of the third aspect, the first network is the home network of the terminal device, and the second network is the visited network of the terminal device; or, the first network is the first visited network of the terminal device, and the second network is the second visited network of the terminal device.

[0087] In conjunction with the third aspect, in some implementations of the third aspect, the method further includes:

[0088] The first access and mobility management network element obtains first configuration information, and the first configuration information is used to instruct the first access and mobility management network element: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; or, the first access and mobility management network element receives a first subscription message from the first network element, and the first subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; or, the first access and mobility management network element receives first policy update information from the first policy control network element, and updates the local policy of the first access and mobility management network element according to the first policy update information, and the local policy of the first network element after the update is: if the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; wherein, the first network includes the first policy control network element.

[0089] In combination with the third aspect, in some implementations of the third aspect, when the terminal device enters the mobility restriction area of ​​the second network, the method further includes:

[0090] The first access and mobility management network element receives a query message from the first network element, where the query message is used to query whether the terminal device has entered the mobility restricted area of ​​the first network; the first access and mobility management network element sends a response message to the first network element based on the query message, where the response message includes indication information that the terminal device has not entered the mobility restricted area of ​​the first network, and / or information of a first area; wherein the first area is the area where the terminal device is located.

[0091] In combination with the third aspect, in some implementations of the third aspect, the first network element is a unified data management network element; or, the first network element is a first policy control network element.

[0092] In a fourth aspect, a communication method is provided, the method being applied to a scenario in which a terminal device accesses a first network and a second network, the first network including a first network element, the second network including a second access and mobility management network element, the method including:

[0093] When the terminal device enters the mobility restriction area of ​​the first network, the second access and mobility management network element receives third information from the first network element, and the third information is used to instruct the second network to stop providing services to the terminal device; the second access and mobility management network element stops providing services to the terminal device based on the third information.

[0094] According to an embodiment of the present application, when a terminal device enters a mobility restriction area of ​​a first network, the second access and mobility management network element may stop providing services to the terminal device, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the first network and the second network on the terminal device remain consistent.

[0095] In combination with the fourth aspect, in some implementations of the fourth aspect, the first network element is a first access and mobility management network element, and the method further includes:

[0096] The second access and mobility management network element receives first information and second information from the communication device, the first information includes an identifier of the first access and mobility management network element, and the second information is used to indicate that the communication device is in a multi-connection state; the second access and mobility management network element sends the second information and fourth information to the first access and mobility management network element based on the first information, and the fourth information includes the identifier of the second access and mobility management network element.

[0097] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first information is the 5G-GUTI corresponding to the first access and mobility management network element, or the GUAMI corresponding to the first access and mobility management network element; the fourth information is the 5G-GUTI corresponding to the second access and mobility management network element, or the GUAMI corresponding to the second access and mobility management network element.

[0098] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first network is the home network of the terminal device, and the second network is the visited network of the terminal device; or, the first network is the first visited network of the terminal device, and the second network is the second visited network of the terminal device.

[0099] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the third information is used to indicate one or more of the following:

[0100] Instruct the terminal device to enter the mobility restriction area of ​​the first network; instruct the terminal device to be deregistered; instruct the release of all sessions of the terminal device; instruct the cessation of information interaction with the terminal device; instruct the update of the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0101] In combination with the fourth aspect, in some implementations of the fourth aspect, the second access and mobility management network element stops providing services to the terminal device according to the third information, including:

[0102] The second access and mobility management network element sends a deregistration request message to the terminal device according to the third information, where the deregistration request message is used to deregister the terminal device.

[0103] In combination with the fourth aspect, in certain implementations of the fourth aspect, the deregistration request message also includes a reason for deregistering the terminal device, and the reason is that the terminal device enters a mobility restriction area of ​​the first network.

[0104] In combination with the fourth aspect, in some implementations of the fourth aspect, the second access and mobility management network element stops providing services to the terminal device according to the third information, including:

[0105] The second access and mobility management network element releases all sessions of the terminal device according to the third information.

[0106] In addition, as another way, the terminal device can still maintain the registration state. The second access and mobility management network element can restrict the terminal device from establishing a session and restricting the terminal device from obtaining related services according to the third information. The second access and mobility management network element can also stop exchanging other information with the terminal device except information related to mobility according to the third information.

[0107] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the method further includes:

[0108] The second access and mobility management network element updates the mobility restriction area list of the terminal device in the second network according to the third information, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area.

[0109] According to an embodiment of the present application, when a terminal device enters a mobility restricted area of ​​a first network, the second access and mobility management network element can update the mobility restricted area list of the terminal device in the second network, so that when the terminal device subsequently enters the first area, the second access and mobility management network element can directly stop providing services to the terminal device, thereby reducing signaling interactions and reducing overhead.

[0110] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first network element is a first access and mobility management network element; or, the first network element is a unified data management network element.

[0111] Alternatively, the first network element is a first policy control network element, and the second access and mobility management network element receives the third information from the first network element, including: the second access and mobility management network element receives the third information from the first network element through the second policy control network element in the second network.

[0112] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the method further includes:

[0113] The second access and mobility management network element receives a mobility registration update request message from the terminal device; the second access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the second network according to the mobility registration update request message; in the case where the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends fifth information to the first network element, the fifth information indicating that the terminal device enters the mobility restriction area of ​​the second network; the second access and mobility management network element receives sixth information from the first network element, the sixth information indicating any one of the following:

[0114] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located.

[0115] The second access and mobility management network element provides a service to the terminal device according to the sixth information. For example, the second access and mobility management network element may accept a mobility registration update request of the terminal device.

[0116] According to an embodiment of the present application, when a terminal device enters a mobility restriction area of ​​a second network, if the terminal device has not entered a mobility restriction area of ​​a first network, a second access and mobility management network element can provide services to the terminal device, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device.

[0117] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the method further includes:

[0118] The second access and mobility management network element updates the mobility restriction area list of the terminal device in the second network according to the sixth information, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area.

[0119] According to an embodiment of the present application, when a terminal device enters a mobility restricted area of ​​a second network but does not enter a mobility restricted area of ​​a first network, the second access and mobility management network element may update the mobility restricted area list of the terminal device in the second network, so that when the terminal device subsequently enters the first area, the second access and mobility management network element may directly accept the mobility registration update of the terminal device, thereby reducing signaling interaction and reducing overhead.

[0120] In combination with the fourth aspect, in some implementations of the fourth aspect, the first network element is a first access and mobility management network element or a unified data management network element, and the method further includes:

[0121] The second access and mobility management network element obtains second configuration information, and the second configuration information is used to instruct the second access and mobility management network element: if the terminal device enters the mobility restriction area of ​​the second network, send the fifth information to the first network element; or, the second access and mobility management network element receives a second subscription message from the first network element, and the second subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element; or, the second access and mobility management network element receives second policy update information from the second policy control network element, and updates the local policy of the second access and mobility management network element according to the second policy update indication information. After the update, the local policy of the second access and mobility management network element is: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element, and the second network includes the second policy control network element.

[0122] In combination with the fourth aspect, in some implementations of the fourth aspect, the first network element is a first policy control network element; and the second access and mobility management network element sends fifth information to the first network element, including:

[0123] The second access and mobility management network element sends the fifth information to the first network element through a second policy control network element in the second network.

[0124] The second access and mobility management network element receives the sixth information from the first network element, including: the second access and mobility management network element receives the sixth information from the first network element through the second policy control network element.

[0125] In conjunction with the fourth aspect, in some implementations of the fourth aspect, the method further includes:

[0126] The second access and mobility management network element obtains second configuration information, and the second configuration information is used to instruct the second access and mobility management network element: if the terminal device enters the mobility restriction area of ​​the second network, send the fifth information to the second policy control network element; or, the second access and mobility management network element receives a second subscription message from the second policy control network element, and the second subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the second policy control network element; or, the second access and mobility management network element receives second policy update information from the second policy control network element, and updates the local policy of the second access and mobility management network element according to the policy update indication information, and the local policy of the second access and mobility management network element after the update is: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the second policy control network element.

[0127] In a fifth aspect, a communication method is provided, the method being applied to a scenario in which a terminal device accesses a first network and a second network, the first network including a first policy control network element, and the second network including a second policy control network element and a second access and mobility management network element; when the terminal device enters a mobility restricted area of ​​the first network, the method includes:

[0128] The second policy control network element receives third information from the first policy control network element, where the third information is used to instruct the second network to stop providing services to the terminal device; and the second policy control network element sends the third information to the second access and mobility management network element.

[0129] According to an embodiment of the present application, when a terminal device enters the mobility restriction area of ​​the first network, the second policy control network element can obtain third information from the first network and send the third information to the second access and mobility management network element, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the terminal device by the first network and the second network remain consistent.

[0130] In combination with the fifth aspect, in certain implementations of the fifth aspect, the first network is the home network of the terminal device, and the second network is the visited network of the terminal device; or, the first network is the first visited network of the terminal device, and the second network is the second visited network of the terminal device.

[0131] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the third information is used to indicate one or more of the following:

[0132] Instruct the terminal device to enter the mobility restriction area of ​​the first network; instruct the terminal device to be deregistered; instruct the release of all sessions of the terminal device; instruct the cessation of information interaction with the terminal device; instruct the update of the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0133] In combination with the fifth aspect, in some implementations of the fifth aspect, when the terminal device enters a mobility restriction area of ​​the second network, the method includes:

[0134] The second policy control network element receives fifth information from the second access and mobility management network element, where the fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network; the second policy control network element sends the fifth information to the first policy control network element; the second policy control network element receives sixth information from the first policy control network element, where the sixth information indicates one or more of the following:

[0135] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located.

[0136] The second policy control network element sends the sixth information to the second access and mobility management network element.

[0137] According to an embodiment of the present application, when a terminal device enters a mobility restriction area of ​​a second network, a second policy control network element may send fifth information to the first network and obtain sixth information from the first network, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the first network and the second network on the terminal device remain consistent.

[0138] In conjunction with the fifth aspect, in some implementations of the fifth aspect, the method further includes:

[0139] The second policy control network element sends a second subscription message to the second access and mobility management network element, and the second subscription message is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the second policy control network element; or, the second policy control network element sends a second indication message to the second access and mobility management network element, and the second indication message is used to update the local policy of the second access and mobility management network element. After the update, the local policy of the second access and mobility management network element is: if the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the second policy control network element.

[0140] In a sixth aspect, a communication method is provided, the method being applied to a scenario in which a terminal device accesses a first network and a second network, the first network including a first access and mobility management network element, the second network including a second access and mobility management network element, the method including:

[0141] The first access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the first network; when the terminal device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends third information to the second access and mobility management network element, and the third information is used to instruct the second network to stop providing services to the terminal device; the second access and mobility management network element stops providing services to the terminal device according to the third information; and the first access and mobility management network element stops providing services to the terminal device.

[0142] According to an embodiment of the present application, in a multi-connection (for example, dual connection) scenario, if a terminal device enters a mobility restriction area of ​​a first network, a first access and mobility management network element sends a third message to a second access and mobility management network element, and the second access and mobility management network element stops providing services to the terminal device. The first access and mobility management network element also stops providing services to the terminal device, thereby enabling the first network and the second network to collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the first network and the second network on the terminal device remain consistent.

[0143] In combination with the sixth aspect, in certain implementations of the sixth aspect, the first network is the home network of the terminal device, and the second network is the visited network of the terminal device; or, the first network is the first visited network of the terminal device, and the second network is the second visited network of the terminal device.

[0144] In conjunction with the sixth aspect, in some implementations of the sixth aspect, the third information is used to indicate one or more of the following:

[0145] Instruct the terminal device to enter the mobility restriction area of ​​the first network; instruct the terminal device to be deregistered; instruct the release of all sessions of the terminal device; instruct the cessation of information interaction with the terminal device; instruct the update of the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0146] In combination with the sixth aspect, in some implementations of the sixth aspect, the second access and mobility management network element stops providing services to the terminal device according to the third information, including:

[0147] The second access and mobility management network element sends a deregistration request message to the terminal device according to the third information, where the deregistration request message is used to deregister the terminal device.

[0148] In combination with the sixth aspect, in certain implementations of the sixth aspect, the deregistration request message also includes a reason for deregistering the terminal device, and the reason is that the terminal device enters a mobility restricted area of ​​the first network.

[0149] In combination with the sixth aspect, in some implementations of the sixth aspect, the second access and mobility management network element stops providing services to the terminal device according to the third information, including:

[0150] The second access and mobility management network element releases all sessions of the terminal device according to the third information.

[0151] In conjunction with the sixth aspect, in some implementations of the sixth aspect, the method further includes:

[0152] The second access and mobility management network element updates the mobility restriction area list of the terminal device in the second network according to the third information, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area.

[0153] According to an embodiment of the present application, when a terminal device enters a mobility restricted area of ​​a first network, the second access and mobility management network element can update the mobility restricted area list of the terminal device in the second network, so that when the terminal device subsequently enters the first area, the second access and mobility management network element can directly stop providing services to the terminal device, thereby reducing signaling interactions and reducing overhead.

[0154] In combination with the sixth aspect, in some implementations of the sixth aspect, the first access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the first network, including:

[0155] The first access and mobility management network element receives a mobility registration update request message from the terminal device; the first access and mobility management network element determines whether the terminal device enters a mobility restriction area of ​​the first network based on the mobility registration update request message.

[0156] In combination with the sixth aspect, in some implementations of the sixth aspect, the first access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the first network, including:

[0157] The second access and mobility management network element receives a mobility registration update request message from the terminal device; the second access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the second network based on the mobility registration update request message; when the terminal device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends fifth information to the first access and mobility management network element, and the fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network; the first access and mobility management network element determines whether the terminal device enters the mobility restriction area of ​​the first network based on the fifth information.

[0158] In combination with the sixth aspect, in some implementations of the sixth aspect, when the terminal device does not enter the mobility restriction area of ​​the first network, the first access and mobility management network element sends sixth information to the second access and mobility management network element, where the sixth information is used to indicate any one of the following:

[0159] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located.

[0160] The second access and mobility management network element provides a service to the terminal device according to the sixth information. For example, the second access and mobility management network element may accept a mobility registration update request of the terminal device.

[0161] In conjunction with the sixth aspect, in some implementations of the sixth aspect, the method further includes:

[0162] The second access and mobility management network element updates the mobility restriction area list of the terminal device in the second network according to the sixth information, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area.

[0163] According to an embodiment of the present application, when a terminal device enters a mobility restricted area of ​​a second network but does not enter a mobility restricted area of ​​a first network, the second access and mobility management network element may update the mobility restricted area list of the terminal device in the second network, so that when the terminal device subsequently enters the first area, the second access and mobility management network element may directly accept the mobility registration update of the terminal device, thereby reducing signaling interaction and reducing overhead.

[0164] In the seventh aspect, a communication device is provided. In a possible implementation, the communication device may include a module or unit corresponding to the method / operation / step / action described in any one of the first to fifth aspects. The module or unit may be a hardware circuit, or software, or a combination of a hardware circuit and software.

[0165] In an eighth aspect, a communication device is provided, comprising a communication interface and a processor, wherein the communication interface is used to output and / or input signals, and the processor is used to execute a computer program or instruction stored in a memory, so that the communication device executes the method described in any one of the first to fifth aspects.

[0166] Optionally, the memory may be included in the communication device. As one approach, the memory may be provided separately from the processor; as another approach, the memory may be located in the processor and integrated with the processor.

[0167] Optionally, the memory may also be outside the communication device and coupled to the processor.

[0168] In a ninth aspect, a computer-readable storage medium is provided, comprising a computer program, which, when executed on a computer, enables the computer to execute a method in any possible implementation of the first to fifth aspects.

[0169] In a tenth aspect, a chip or a chip system is provided, the chip or the chip system comprising a processing circuit and an input / output interface, the processing circuit being used to execute the method in any possible implementation of the first to fifth aspects.

[0170] In the eleventh aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instruction), which, when executed, enables a computer to execute a method in any possible implementation of the first to fifth aspects.

[0171] In the twelfth aspect, a communication system is provided, which includes a first network and a second network, and a terminal device accesses the first network and the second network, the first network includes a first AMF, and the second network includes a second AMF, and the first AMF and the second AMF are used to execute the method in any possible implementation manner of the sixth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0172] Figure 1 A communication system to which the present application is applicable is shown.

[0173] Figure 2 This is a schematic diagram of the method proposed in this application.

[0174] Figure 3 The present invention is a flow chart of the method in which the first network element is the first AMF.

[0175] Figure 4 The figure is a flow chart of the method in which the first network element is UDM.

[0176] Figure 5 The figure is a flow chart of a method in which the first network element is the first PCF.

[0177] Figure 6 A schematic block diagram of a communication device provided in this application.

[0178] Figure 7 Another schematic block diagram of the communication device provided in this application. DETAILED DESCRIPTION

[0179] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The specific operation method in the method embodiment can also be applied to the device embodiment or the system embodiment. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0180] It is understood that the various numbers involved in this application are only used for the convenience of description and are not used to limit the scope of this application. The order of execution of each process should be determined by its function and internal logic.

[0181] The terms "first", "second", "third", "fourth" and various other terminology and designations (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0182] It can be understood that, in the present application, “used for indication” may include both direct indication and indirect indication.

[0183] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. A person of ordinary skill in the art can appreciate that with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0184] The technical solution provided by this application can be applied to various communication systems, such as the fifth generation (5 th generation, 5G) mobile communication system or new radio (NR) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, etc. The technical solution provided by this application can also be applied to future communication systems, such as the sixth generation (6 thThe technical solution provided in this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0185] Figure 1 (A) is a schematic diagram of a communication network architecture. The network architecture may specifically include the following devices or network elements:

[0186] 1. User equipment (UE): It can also be called terminal equipment, which can include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of terminals, mobile stations (MS), terminals or soft terminals, etc. For example, water meters, electric meters, sensors, etc.

[0187] 2. (Radio) access network (R)AN): used to provide network access for authorized user devices in a specific area, and can use transmission tunnels of different qualities according to the level of user devices, business requirements, etc.

[0188] RAN can manage radio resources, provide access services for user equipment, and then complete the forwarding of control signals and user equipment data between user equipment and the core network.

[0189] The access network equipment includes but is not limited to: the next generation node base station (gNB) in the 5G system, the evolved node B (eNB) in the LTE system, the radio network controller (RNC), the node B (NB), the base station controller (BSC), the base transceiver station (BTS), the home base station (home evolved node B, or home node B, HNB), the base band unit (BBU), the transmission receiving point (TRP), the transmitting point (TP), the small base station equipment (pico), the mobile switching center, or the network equipment in the future network, etc. It is understandable that the present application does not limit the specific type of access network equipment. In systems using different wireless access technologies, the names of devices with access network equipment functions may be different.

[0190] Optionally, in some deployments of access devices, the access device may include a centralized unit (CU) and a distributed unit (DU). In other deployments of access devices, the CU may also be divided into a CU-control plane (CP) and a CU-user plane (UP). In still other deployments of access devices, the access device may also be an open radio access network (ORAN) architecture, etc. This application does not limit the specific deployment method of the access device.

[0191] 3. User plane function (UPF) network element: used for packet routing and forwarding and quality of service (QoS) processing of user plane data. User data can be accessed to the data network (DN) through this network element. In the embodiment of the present application, it can be used to implement the functions of the user plane network element.

[0192] 4. DN: A network used to transmit data, such as a carrier's service network, the Internet, or a third-party service network.

[0193] 5. Authentication server function (AUSF) network element: mainly used for user authentication, etc.

[0194] 6. Access and mobility management function (AMF) network element: Mainly used for mobility management and access management, for example, it can be used to implement mobility restriction, initial registration of terminal equipment, mobility registration update, deregistration, registration management, etc.

[0195] 7. Session management function (SMF) network element: mainly used for session management, allocation and management of Internet protocol (IP) addresses of terminal devices, selection and management of user plane functions, endpoints of policy control and charging function interfaces, and downlink data notification.

[0196] 8. Policy control function (PCF) network element: a unified policy framework used to guide network behavior and provide policy rule information to network elements (such as AMF, SMF network elements, etc.) or terminal devices.

[0197] For example, PCF can provide access and mobility policy control services to AMF, which includes providing mobility-related policy rules to AMF and updating mobility-related policy rules.

[0198] 9. Network repository function (NRF) network element: used to store description information of network function entities and the services they provide, and to support functions such as service discovery and network element entity discovery.

[0199] 10. Network exposure function (NEF) network element: used to securely open the services and capabilities provided by the Third Generation Partnership Project (3GPP) network function to the outside world.

[0200] 11. Unified data management (UDM) network element: used for unified data management, 5G user data management, processing user identification, access authentication, registration, or mobility management, etc.

[0201] For example, UDM can perform security authentication in the mobility registration process of the terminal device, exchange contract data with AMF, update the context of the terminal device, etc.

[0202] 12. Application function (AF) network element: used for data routing affected by applications, accessing network open function network elements, interacting with the policy framework for policy control, etc.

[0203] 13. Network data analytics function (NWDAF): NWDAF can have at least one of the following functions:

[0204] Data collection, model training, model feedback, analysis result reasoning, analysis result feedback, etc.

[0205] In the above network architecture, the N2 interface is the interface between the RAN and AMF network elements, used for sending radio parameters, non-access stratum (NAS) signaling, etc.; the N3 interface is the interface between the RAN and UPF network elements, used for transmitting user plane data, etc.; the N4 interface is the interface between the SMF network element and the UPF network element, used for transmitting information such as service policies, tunnel identification information of the N3 connection, data cache indication information, and downlink data notification messages. The N6 interface is the interface between the DN network element and the UPF network element, used for transmitting user plane data, etc.

[0206] It should be understood that the above-mentioned network architecture applied to the embodiments of the present application is merely an example of a network architecture described from the perspective of a traditional point-to-point architecture and a service-oriented architecture. The network architecture applicable to the embodiments of the present application is not limited to this. Any network architecture that can realize the functions of the above-mentioned network elements is applicable to the embodiments of the present application.

[0207] It should be noted that the names of the network elements and interfaces in this application are only examples, and this application does not exclude the possibility that the network elements may be named differently in the future, or that the functions of the network elements may be merged. With the evolution of technology, any device or network element that can realize the functions of the above network elements is within the protection scope of this application. Secondly, the above network elements may also be referred to as entities, equipment, devices, functions or modules, etc., which are not specifically limited in this application.

[0208] For ease of understanding, some terms in this application are explained below.

[0209] (1) Tracking area (TA)

[0210] A TA may include one or more cells.

[0211] (2)Registration area (RA)

[0212] An RA may include one or more TAs, which may be included in a "TA list".

[0213] As an implementation manner, if the terminal device moves within the TA list allocated to the terminal device, the terminal device does not need to perform mobility registration update.

[0214] In other words, if the terminal device leaves the current registration area, the terminal device needs to initiate a mobility registration update and the AMF will allocate a new registration area.

[0215] (3) Mobility restrictions

[0216] The mobility restriction of terminal equipment is used to restrict UE from accessing the network or obtaining services in a specific area. The mobility restrictions include the following:

[0217] a: Radio access type (RAT) restriction

[0218] RAT restriction is based on the granularity of public land mobile network (PLMN). RAT restriction is used to specify the allowed and unallowed radio access types for a certain PLMN.

[0219] b: forbidden area

[0220] The prohibited area is based on the TA granularity. In the prohibited area, the terminal device is not allowed to initiate communication to any network in the TA.

[0221] c: Service area restriction

[0222] In the service area restriction, two types of areas are defined, namely the allowed area and the non-allowed area. In the allowed area, the terminal device can communicate with the network. In the non-allowed area, except for mobility-related data, no other communication is allowed between the terminal device and the network.

[0223] d: core network type restriction

[0224] The core network type restriction defines whether the UE can access the 5GC under a PLMN network and / or whether the UE can access the evolved packet core (EPC) network under a PLMN network.

[0225] (4) NR satellite access

[0226] Since the coverage of satellites is large, for low-orbit satellites or high-orbit satellites, the satellites are constantly moving relative to the ground during their movement. Therefore, the coverage of satellites is also mobile. During the movement of satellites, satellites may cover one or more TAs at the same time. After the UE accesses the core network via satellite, if there is at least one registration area belonging to the UE in the TA covered by the satellite, the UE does not need to perform mobility registration update.

[0227] That is, when the satellite moves, the satellite may broadcast one or more tracking area identities (TAI), and the terminal device may receive one TAI, or multiple TAIs. When all TAs indicated by the TAIs broadcast by the satellite belong to the mobility restricted area, the terminal device is considered to be in the mobility restricted area. When at least one TA among all TAs indicated by the TAIs broadcast by the satellite does not belong to the mobility restricted area, the terminal device is considered not to be in the mobility restricted area.

[0228] Similarly, for service area restriction, when all TAs indicated by the TAIs broadcast by the satellite belong to the non-permitted area, the terminal device is considered to be in the non-permitted area. When at least one TA among all TAs indicated by the TAIs broadcast by the satellite belongs to the permitted area, the terminal device is considered not to be in the non-permitted area (or in the permitted area).

[0229] (5) The home public land mobile network (H-PLMN) and the visit public land mobile network (V-PLMN) of the terminal device

[0230] The H-PLMN of the terminal device may also be referred to as the home network of the terminal device. In the embodiment of the present application, the H-PLMN of the terminal device may be understood as: the PLMN where the subscription data of the terminal device is located.

[0231] The V-PLMN of the terminal device may also be referred to as the visited network of the terminal device. In the embodiment of the present application, the V-PLMN of the terminal device may be understood as: the PLMN to which the terminal device accesses using the subscribed data roaming of the H-PLMN.

[0232] (6) Multiple connections

[0233] like Figure 1As shown in (B) in FIG. 1 , multi-connection can be understood as a terminal device using the same subscription data to access multiple different networks through multiple 3GPP interfaces at the same time. It can be understood that Figure 1 The architecture of (B) is merely exemplary, and the terminal device can access two or more networks.

[0234] For example, the terminal device accesses the H-PLMN through a subscription data, and additionally selects a V-PLMN for roaming access, thereby realizing a dual-connection architecture for simultaneously accessing two networks.

[0235] For another example, the terminal device can access two V-PLMNs (respectively referred to as a first V-PLMN and a second V-PLMN), the first V-PLMN being a primary V-PLMN and the second V-PLMN being a secondary V-PLMN.

[0236] In addition, in this application, multiple connections can be further extended as follows:

[0237] 1: Support dual / multiple radio capability.

[0238] 2: Support dual (or multiple) 3GPP access technology (dual / multiple 3GPP RAT).

[0239] 3: Support dual (or multiple) steer capability.

[0240] 4: Support dual / multiple 3GPP access.

[0241] 5: Support dual / multiple 3GPP access type.

[0242] 6: Support dual / multiple registration.

[0243] 7: Support the same access type.

[0244] 8: Support the same access technology (same RAT).

[0245] 9: Support the same access network.

[0246] (7) Access type and access technology:

[0247] The 3GPP access network refers to an access network whose access type is a 3GPP access type (the access type may also be referred to as an access mode).

[0248] 3GPP access types include but are not limited to the following access technologies: LTE access technology (corresponding to 4G cellular network), NR access technology (corresponding to 5G cellular network), 3GPP-defined satellite access technology, or subsequently evolved cellular access technology; the 3GPP-defined satellite access technology can also be subdivided into low-orbit satellite access technology, medium-orbit satellite access technology, and synchronous satellite access technology.

[0249] The non-3GPP access network refers to an access network whose access type is a non-3GPP access type.

[0250] Non-3GPP access types include, but are not limited to, the following access technologies: untrusted non-3GPP access technology (e.g., access to the core network through wireless access nodes purchased by individuals), trusted non-3GPP access technology (e.g., access to the core network through wireless access nodes deployed by operators), wireline access technology, Institute of Electrical and Electronics Engineers (IEEE) 802.11 access technology, non-3GPP access technology connected through standalone non-public networks (NPN) (standalone NPN, SNPN), wired-broadband forum (BBF) access technology, wired-cable (cable) access technology, etc. Specifically, non-3GPP access types may be or may include access technologies such as wired, wireless fidelity (WiFi), Bluetooth, ZigBee, etc.

[0251] The technical issues addressed by this application are described below.

[0252] Taking dual connection in multiple connections as an example, the terminal device can access the first network and the second network. In an embodiment of the present application, as one case, the first network can be an H-PLMN network, and the second network can be a V-PLMN network. As another case, the first network can be a first V-PLMN network, and the second network can be a second V-PLMN network.

[0253] Currently, in a multi-connection scenario, for mobility registration of a terminal device, the first network and the second network manage the mobility of the terminal device independently.

[0254] Due to different deployment modes of different networks, the distribution of cells in different networks may be different. Furthermore, the distribution of tracking areas (TAs) in different networks may be different. Furthermore, for a certain terminal device, the registration area allocated to the terminal device in the first network may be different from the registration area allocated to the terminal device in the second network. Furthermore, the mobility restriction area of ​​the terminal device in the first network may be different from the mobility restriction area of ​​the terminal device in the second network.

[0255] Based on this, the different mobility restriction areas of the first network and the second network may lead to the following situations:

[0256] (1) The location of the terminal device is within the mobility restriction area of ​​the first network, but not within the mobility restriction area of ​​the second network.

[0257] (2) The location of the terminal device is not within the mobility restriction area of ​​the first network, but within the mobility restriction area of ​​the second network.

[0258] In addition, in a multi-connection (e.g., dual-connection) scenario, the terminal device can access network #1 through a satellite and access network #2 through a ground access network device. In this scenario, since the coverage of a satellite can include multiple TAs, even if the terminal device enters the mobility restriction area of ​​network #2, if the TAI broadcast by the satellite also includes other TAs that do not belong to the mobility restriction area, it is considered that the terminal device has not entered the mobility restriction area of ​​network #1.

[0259] For example, the coverage of the satellite includes TA1 and TA2, TA2 belongs to the mobility restriction area of ​​the terminal device, and TA1 does not belong to the mobility restriction area of ​​the terminal device. When the terminal device enters TA2 from TA1, the TA information broadcast by the ground access network equipment changes from TA1 to TA2. Therefore, in network #2, the terminal device enters the prohibited area; if the TA information broadcast by the satellite includes TA1 and TA2, since TA1 does not belong to the mobility restriction area of ​​the terminal device, it can be considered that the terminal device has not entered the mobility restriction area of ​​network #1.

[0260] In summary, in a multi-connection scenario, the two networks to which the terminal device accesses may have different restrictions on the mobility of the terminal device, or the two networks may not coordinate the management of the mobility of the terminal device. Since the two networks manage the mobility of the terminal device independently, the terminal device may still be able to obtain related services in certain mobility-restricted areas.

[0261] For example, the location of the terminal device is within the mobility restriction area of ​​the first network, but not within the mobility restriction area of ​​the second network. If the first network and the second network manage the mobility of the terminal device separately, in the first network, since the location of the terminal device is within the mobility restriction area of ​​the first network, the terminal device cannot obtain related services (for example, service #1), but in the second network, since the location of the terminal device is not within the mobility restriction area of ​​the second network, the terminal device can obtain service #1, that is, the two networks have inconsistent management of the mobility of the terminal device, resulting in the location of the terminal device being within the mobility restriction area of ​​the first network, but still being able to obtain service #1.

[0262] In addition, if the terminal device is within the mobility restriction area of ​​the second network but not within the mobility restriction area of ​​the first network, according to the existing two networks independently managing the mobility of the terminal device, the terminal device cannot obtain related services (for example, service #2) in the second network, but the terminal device can obtain service #2 in the first network. In other words, the first network and the second network have inconsistent mobility management of the terminal device.

[0263] In response to the above problems, Figure 2 As shown, the present application proposes a method 200, which is applicable to a communication system in which a terminal device accesses a first network and a second network, and the first network includes a first network element. In an embodiment of the present application, as a case, the first network may be an H-PLMN network, and the second network may be a V-PLMN network. As another case, the first network may be a first V-PLMN network, and the second network may be a second V-PLMN network, wherein the first V-PLMN network is a primary V-PLMN network, and the second V-PLMN network is a secondary V-PLMN network.

[0264] In addition, in the embodiment of the present application, the first network element may be a first access and mobility management network element, or a unified data management network element, or a first policy control network element.

[0265] For the convenience of description, in the embodiment of the present application, the access and mobility management network element may be an AMF network element, the unified data management network element may be a UDM network element, the policy control network element may be a PCF network element, the access network device may be a RAN, and the authentication service device may be an AUSF network element. This will not be described in detail below.

[0266] Specifically, the method 200 includes the following steps:

[0267] S200: Establish an association relationship between the first network and the second network.

[0268] Case 1:

[0269] The first AMF in the first network establishes an association relationship with the second AMF in the second network. For this process, reference may be made to method 300 below, which will not be described in detail here.

[0270] Case 2:

[0271] The UDM in the first network establishes an association relationship between the first AMF and the second AMF. For this process, reference may be made to method 400 below, which will not be described in detail here.

[0272] Case 3:

[0273] The first PCF in the first network establishes an association relationship with the second PCF in the second network. For this process, reference may be made to the method 500 described below, which will not be described in detail here.

[0274] S201, a first network element determines whether a terminal device enters a mobility restriction area of ​​a first network.

[0275] The following are several situations in which S201 is triggered:

[0276] Scenario A:

[0277] The first network element is the first AMF.

[0278] Step 1: The terminal device sends a mobility registration update request message to the first AMF.

[0279] It is understandable that, in the first network, if the terminal device leaves the current registration area, the terminal device will send a mobility registration update request message to the device in the first network. This will not be described in detail below.

[0280] Step 2: The first AMF determines whether the terminal device enters the mobility restriction area of ​​the first network according to the mobility registration update request message. The mobility registration update request message includes an identifier of the area (TA) where the terminal device is currently located.

[0281] It can be understood that if the TA in which the terminal device is currently located is in the mobility restriction area list, the first AMF determines that the terminal device enters the mobility restriction area of ​​the first network.

[0282] If the TA in which the terminal device is currently located is not in the mobility restriction area list, the first AMF determines that the terminal device has not entered the mobility restriction area of ​​the first network.

[0283] Case B:

[0284] The first network element is UDM.

[0285] Step 1: The terminal device sends a mobility registration update request message to the first AMF.

[0286] Step 2: The first AMF determines whether the terminal device enters the mobility restriction area of ​​the first network based on the mobility registration update request message.

[0287] Step 3: When the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message to the UDM, which indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0288] Step 4: The UDM determines, based on the notification message, that the terminal device enters the mobility restriction area of ​​the first network.

[0289] Case C:

[0290] The first network element is the first PCF.

[0291] Step 1: The terminal device sends a mobility registration update request message to the first AMF.

[0292] Step 2: The first AMF determines whether the terminal device enters the mobility restriction area of ​​the first network based on the mobility registration update request message.

[0293] Step 3: When the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message to the first PCF, which indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0294] Step 4: The first PCF determines, based on the notification message, that the terminal device enters the mobility restriction area of ​​the first network.

[0295] Situation D:

[0296] The first network element is the first AMF, UDM or the first PCF.

[0297] Step 1: The terminal device sends a mobility registration update request message to a device in the second network.

[0298] Similarly, in the second network, if the terminal device leaves the current registration area, the terminal device will send a mobility registration update request message to the device in the second network.

[0299] For example, the terminal device can send a mobility registration update request message to the AMF in the second network (referred to as the second AMF).

[0300] Step 2: The device in the second network determines whether the terminal device enters the mobility restriction area of ​​the second network according to the mobility registration update request message.

[0301] For example, the second AMF can determine whether the terminal device enters the mobility restriction area of ​​the second network.

[0302] Step 3: When the terminal device enters the mobility restriction area of ​​the second network, the device in the second network sends fifth information to the first network element. The fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network.

[0303] For example, the second AMF can send the fifth information to the first network element.

[0304] Step 4: The first network element determines whether the terminal device enters the mobility restriction area of ​​the first network based on the fifth information.

[0305] As an implementation method, if the first network element is the first AMF, the first network element can determine whether the terminal device enters the mobility restriction area of ​​the first network according to the current location of the terminal device.

[0306] As another implementation method, if the first network element is a UDM or a first PCF, the first network element can send a query message to the first AMF, and determine whether the terminal device enters the mobility restriction area of ​​the first network based on a response message of the first AMF to the query message.

[0307] As another implementation method, if the first network element is a UDM or a first PCF, the first network element can determine whether the terminal device enters the mobility restriction area of ​​the first network based on whether a message related to the terminal device mobility update is received from the first AMF.

[0308] For the above-mentioned cases A to D, the method further includes S202-1 and S203-1.

[0309] S202-1, when the terminal device enters the mobility restriction area of ​​the first network, the first network element sends third information to the device in the second network. Correspondingly, the device in the second network receives the third information.

[0310] The third information is used to instruct the second network to stop providing services to the terminal device. Specifically, the third information is used to indicate one or more of the following:

[0311] Instructing the terminal device to enter the mobility restriction area of ​​the first network; instructing to deregister the terminal device; instructing to release all sessions of the terminal device; instructing to stop information interaction with the terminal device; instructing to update the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0312] S203-1: The device in the second network stops providing services to the terminal device according to the third information.

[0313] Case 1:

[0314] For example, the third information may indicate that the terminal device enters a forbidden area of ​​the first network or indicates that the terminal device is to be deregistered. Optionally, the third information may also indicate one or more of releasing all sessions of the terminal device, stopping information interaction with the terminal device, and updating a forbidden area list of the terminal device in the second network.

[0315] As a way, the device in the second network can deregister the terminal device according to the third information. Exemplarily, the device in the second network can send a deregistration request message to the terminal device. Optionally, the deregistration request message can also include a reason for deregistering the terminal device, which is that the terminal device enters a mobility restriction area of ​​the first network.

[0316] It is understandable that, in the process of deregistering the terminal device, the device in the second network may release all sessions with the terminal device and stop information interaction with the terminal device.

[0317] Case 2:

[0318] For example, the third information may indicate that the terminal device has entered a non-allowed area of ​​the first network. Optionally, the third information may also indicate that all sessions of the terminal device are released, or indicate that a list of non-allowed areas of the second network for the terminal device is updated. Optionally, unlike situation 1, in situation 2, the terminal device may still remain registered.

[0319] As a way, the device in the second network can restrict the terminal device from establishing a new session and restrict the terminal device from obtaining related services according to the third information. In addition, the device in the second network can release all sessions with the terminal device.

[0320] As another way, the device in the second network can stop exchanging information other than information related to mobility with the terminal device according to the third information. That is, at this time, the device in the second network can only exchange information related to mobility with the terminal device.

[0321] In addition, optionally, for the above-mentioned situation 1 and situation 2, the device in the second network can also update the mobility restriction area list of the terminal device in the second network based on the third information, and the updated mobility restriction area list of the terminal device in the second network includes a first area (TA), and the first area is the area where the terminal device is currently located.

[0322] For the above situation D, the method further includes S202-2 and S203-2.

[0323] S202-2: When the terminal device does not enter the mobility restriction area of ​​the first network, the first network element sends sixth information to the device in the second network. Correspondingly, the device in the second network receives the sixth information.

[0324] The sixth information is used to indicate any one of the following:

[0325] Indicates that the terminal device has not entered the mobility restriction area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located.

[0326] S203-2: The device in the second network provides services to the terminal device according to the sixth information.

[0327] As a case, the device in the second network can accept the mobility registration update request of the terminal device according to the sixth information.

[0328] Optionally, the device in the second network can update the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area. It can be understood that in this case, the sixth information includes the first area.

[0329] According to the method 200 proposed in the present application, the first network and the second network can collaboratively manage the mobility of the terminal device, so that the mobility restrictions of the terminal device by the first network and the second network are consistent.

[0330] The method 200 is described in detail below for different types of first network elements.

[0331] Figure 3 The method 300 proposed in the present application is shown, in which the first network element is a first AMF. Specifically, the method 300 includes the following steps.

[0332] Among them, the first network includes a first AMF, an AUSF, an UDM, a first RAN, and a first PCF, and the second network includes a second AMF, a second RAN, and a second PCF.

[0333] S301, the terminal device completes the registration process in the first network and obtains information #100 (ie, first information).

[0334] Information #100 includes an identifier of a first AMF in a first network. In other words, information #100 is used to determine a first AMF in the first network. Exemplarily, information #100 may be a globally unique temporary identity (GUTI) assigned by the first AMF to the terminal device, or may be a globally unique AMF identifier (GUAMI).

[0335] 5G-GUTI includes GUAMI and 5G temporary mobile subscriber identity (TMSI). Furthermore, GUAMI includes mobile country code (MCC), mobile network code (MNC) and AMF ID. Among them, 5G-TMSI is the temporary identification of the terminal device. MCC and MNC are the identification of PLMN, and AMF ID is the identification of AMF.

[0336] It is understandable that the terminal device obtains the information #100 during the process of registering with the first network. As a way, the terminal device receives a registration acceptance message from the first AMF during the process of registering with the first network, and the registration acceptance message includes the 5G-GUTI corresponding to the first AMF. Optionally, the registration acceptance message may also include the GUAMI corresponding to the first AMF.

[0337] Among them, the process of registering the terminal device to the first network can refer to the existing 3GPP protocol TS23.502.

[0338] S302: The terminal device sends a message #A to the second RAN. Correspondingly, the second RAN receives the message #A.

[0339] This message #A includes AN parameters (parameters associated with AN) and information #100.

[0340] In the embodiment of the present application, the terminal device also obtains information #200 (i.e., second information), which is used to indicate that the terminal device enters a multi-connection state. The terminal device can send information #100 to the second RAN in the second network during registration with the second network according to information #200.

[0341] As a method, the terminal device can obtain the information #200 based on the user's operation instruction. For example, the user can turn on the multi-connection switch on the terminal device, and further, the terminal device can enter the multi-connection state according to the user's operation instruction.

[0342] As another way, the terminal device can obtain the information #200 from the first AMF. In other words, the first AMF can instruct the terminal device to enter a multi-connection state.

[0343] In addition, the message #A may also indicate that the terminal device is in a multi-connection state.

[0344] Optionally, the message #A may implicitly indicate that the terminal device is in a multi-connection state. For example, the message #100 may be used to implicitly indicate that the terminal device is in a multi-connection state.

[0345] Optionally, the message #A may explicitly indicate that the terminal device is in a multi-connection state. For example, the message #A may also include indication information that the terminal device is in a multi-connection state (or the message #A may also include information #200). In the embodiment of the present application, "indication information that the terminal device is in a multi-connection state", "information #200" and "second information" may be interchangeable.

[0346] Exemplarily, the message #A is an access network (AN) message.

[0347] Taking the case where the message #A explicitly indicates that the terminal device is in a multi-connection state as an example, as a case, the information #100 and the indication information that the terminal device is in a multi-connection state can be included in the registration request message. That is, the AN message can include the AN parameter and the registration request message, and the registration request message includes the information #100 and the indication information that the terminal device is in a multi-connection state.

[0348] The registration request message is used to request registration to the second network, and the registration request message will not be described in detail below.

[0349] As another case, the information #100 and the indication information that the terminal device is in a multi-connection state may be included in the AN parameter. That is, the AN message includes the AN parameter, and the AN parameter includes the information #100 and the indication information that the terminal device is in a multi-connection state.

[0350] As another case, the AN message includes AN parameters, a registration request message, information #100, and indication information that the terminal device is in a multi-connection state. That is, the AN parameters, the registration request message, information #100, and indication information that the terminal device is in a multi-connection state exist in parallel.

[0351] S303: The second RAN selects an AMF according to the AN parameters (the AMF selected by the second RAN is recorded as the second AMF).

[0352] As a method, the second RAN can select an AMF with multi-connection capability based on the indication information that the terminal device is in a multi-connection state.

[0353] S304: The second RAN sends a message #B to the second AMF. Correspondingly, the second AMF receives the message #B.

[0354] The message #B includes information #100. In addition, the message #B is also used to indicate that the terminal device is in a multi-connection state.

[0355] Optionally, the message #B may implicitly indicate that the terminal device is in a multi-connection state. For example, the message #100 may be used to implicitly indicate that the terminal device is in a multi-connection state.

[0356] Optionally, the message #B may explicitly indicate that the terminal device is in a multi-connection state. For example, the message #B may also include indication information that the terminal device is in a multi-connection state. In S302, if the information #100 and the indication information that the terminal device is in a multi-connection state are included in the registration request message, the message #B may be the registration request message.

[0357] Of course, the message #B may also be other types of messages, which is not limited in this application.

[0358] It is understandable that after receiving message #B, the second AMF determines that the terminal device is in a multi-connection state. The second AMF establishes an association relationship with the first AMF. As a way, the second AMF can save the association relationship between the first AMF, the second AMF and the terminal device (denoted as association relationship #1), for example, the association relationship between the identifier of the first AMF, the identifier of the second AMF and the identifier of the terminal device can be saved. As another way, the second AMF can save the association relationship between the first AMF and the terminal device (denoted as association relationship #2), for example, the association relationship between the identifier of the first AMF and the identifier of the terminal device can be saved.

[0359] Among them, the terminal device can send the identifier of the terminal device to the second AMF through the second RAN.

[0360] It can be understood that the second AMF saves association relationship #1 or association relationship #2 in order to subsequently collaborate with the first AMF to manage the mobility of the terminal device. This will not be explained in detail for now.

[0361] S305, the second AMF selects AUSF.

[0362] S306, the terminal device, the second AMF, AUSF, and UDM interact to complete the security process.

[0363] For this process, reference may be made to the existing 3GPP protocol TS23.502.

[0364] For example, the terminal device, the second AMF, AUSF, and UDM can interact to complete the authentication security process.

[0365] S307: The second AMF sends message #C to the UDM. Correspondingly, the UDM receives message #C.

[0366] The message #C is used to indicate that the terminal device is in a multi-connection state. For example, the message #C includes indication information that the terminal device is in a multi-connection state. Exemplarily, the message #C is a terminal device context registration request message. The message #C may include an identifier of the terminal device.

[0367] Specifically, UDM can update the status of the terminal device saved in UDM according to message #C, and the status of the terminal device saved in UDM after the update is a multi-connection state.

[0368] S308, UDM sends message #D (response message to message #C) to the second AMF. Correspondingly, the second AMF receives the message #D.

[0369] Exemplarily, the message #D is a terminal device context registration response message.

[0370] S309: The second AMF sends message #E to the first AMF according to information #100. Correspondingly, the first AMF receives message #E.

[0371] It can be understood that in S302, the second AMF obtains information #100 from message #A. Further, the second AMF can determine the first AMF based on information #100 and send message #E to the first AMF.

[0372] The message #E is used to indicate that the terminal device is in a multi-connection state. The message #E may include an identifier of the terminal device.

[0373] Optionally, the message #E may explicitly indicate that the terminal device is in a multi-connection state. For example, the message #E may include indication information that the terminal device is in a multi-connection state.

[0374] In addition, the message #E also includes information #300 (ie, the fourth information). The information #300 includes the identifier of the second AMF. In other words, the information #300 is used to determine the second AMF. For example, the information #300 is the 5G-GUTI corresponding to the second AMF, or the GUAMI corresponding to the second AMF.

[0375] Exemplarily, the message #E is a terminal device context update request message.

[0376] It is understandable that after receiving message #E, the first AMF determines that the terminal device is in a multi-connection state. The first AMF can establish an association relationship with the second AMF. As a way, the first AMF can save the association relationship between the first AMF, the second AMF and the terminal device (denoted as association relationship #A), for example, the association relationship between the identifier of the first AMF, the identifier of the second AMF and the identifier of the terminal device can be saved. As another way, the first AMF can save the association relationship between the second AMF and the terminal device, for example, the association relationship between the identifier of the second AMF and the identifier of the terminal device can be saved (denoted as association relationship #B).

[0377] It can be understood that the first AMF saves the association relationship #A or the association relationship #B in order to subsequently collaborate with the second AMF to manage the mobility of the terminal device. This will not be explained in detail for now.

[0378] S310, the first AMF sends information about the network element serving the terminal device in the first network to the second AMF according to information #300. Correspondingly, the second AMF receives information about the network element serving the terminal device in the first network.

[0379] For example, the first AMF may send information of the first PCF serving the terminal device in the first network to the second AMF.

[0380] S311, the first AMF obtains a first strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends third information to the second AMF.

[0381] The third information is used to instruct the second network to stop providing services to the terminal device. Specifically, the third information is used to indicate one or more of the following:

[0382] Instructing the terminal device to enter the mobility restriction area of ​​the first network; instructing to deregister the terminal device; instructing to release all sessions of the terminal device; instructing to stop information interaction with the terminal device; instructing to update the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is located.

[0383] The third information will not be elaborated below.

[0384] The following describes how the first AMF obtains the first policy.

[0385] Method 1:

[0386] The first AMF obtains first configuration information, and the first configuration information indicates to the first AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends third information to the second AMF.

[0387] The first AMF may obtain the first policy according to the first configuration information.

[0388] For example, the first configuration information may be pre-configured into the first AMF.

[0389] Method 2:

[0390] The second AMF sends message #F to the first AMF. Correspondingly, the first AMF receives message #F.

[0391] This message #F is used for subscription: If the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends the third information to the second AMF.

[0392] The first AMF may obtain the first policy according to the message #F.

[0393] Method 3:

[0394] The first PCF obtains indication information that the terminal device is in a multi-connection state. As an implementation method, the first AMF can send indication information that the terminal device is in a multi-connection state to the first PCF during the process of establishing an access and mobility (AM) policy association with the first PCF. In other words, the first AMF can select the first PCF and establish an association with the first PCF, and the first PCF can subsequently send the AM policy to the first AMF.

[0395] The first PCF sends first policy update information to the first AMF based on the indication information that the terminal device is in a multi-connection state.

[0396] The first AMF updates the local policy of the first AMF according to the first policy update information. After the update, the local policy of the first AMF is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the third information is sent to the second AMF.

[0397] S312, the second AMF obtains the second strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends the fifth information to the first AMF.

[0398] The fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network.

[0399] The fifth information will not be elaborated below.

[0400] The following describes how the second AMF obtains the second policy.

[0401] Method 1:

[0402] The second AMF obtains second configuration information, which indicates to the second AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends fifth information to the first AMF.

[0403] The second AMF may obtain the second policy according to the second configuration information.

[0404] For example, the second configuration information may be pre-configured into the second AMF.

[0405] Method 2:

[0406] The first AMF sends message #G to the second AMF. Correspondingly, the second AMF receives message #G.

[0407] This message #G is used for subscription: If the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends the fifth information to the first AMF.

[0408] The second AMF may obtain the second policy according to message #G.

[0409] Method 3:

[0410] The second PCF obtains the indication information that the terminal device is in a multi-connection state. As an implementation method, the second AMF may send the indication information that the terminal device is in a multi-connection state to the second PCF during the process of establishing an AM policy association with the second PCF.

[0411] The second PCF sends second policy update information to the second AMF based on the indication information that the terminal device is in a multi-connection state.

[0412] The second AMF updates the local policy of the second AMF according to the second policy update information. After the update, the local policy of the second AMF is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the fifth information is sent to the first AMF.

[0413] S313, the second AMF sends a message #H to the terminal device. Correspondingly, the terminal device receives the message #H.

[0414] This message #H is a registration reception response message.

[0415] That is to say, the terminal device completes the registration process in the second network.

[0416] After S313, as the terminal device moves, as a first case, the terminal device enters the mobility restriction area of ​​the first network, but the terminal device does not enter the mobility restriction area of ​​the second network. For this case, the method 300 also includes the following steps.

[0417] S314-1, the terminal device sends message #I to the first AMF. Correspondingly, the first AMF receives message #I.

[0418] This message #I is used to request a mobility registration update for the terminal device in the first network.

[0419] It can be understood that, in the first network, if the terminal device leaves the current registration area, the terminal device sends the message #I.

[0420] S315-1, the first AMF determines whether the terminal device has entered the mobility restriction area of ​​the first network based on the message #I.

[0421] For example, the first AMF determines whether the terminal device enters a forbidden area of ​​the first network.

[0422] For another example, the first AMF determines whether the terminal device enters a non-allowed area of ​​the first network.

[0423] S316-1: When the terminal device enters the mobility restriction area of ​​the first network, the first AMF stops providing services to the terminal device.

[0424] Case 1:

[0425] The terminal device enters a forbidden area of ​​the first network.

[0426] As a method, the first AMF may send a message #J to the terminal device. Accordingly, the terminal device receives the message #J. The message #J is used to deregister the terminal device in the first network.

[0427] It can be understood that in the process of deregistering the terminal device, the first AMF can release the session with the terminal device (for example, release all sessions related to the terminal device) and stop information interaction with the terminal device (for example, stop all information interaction with the terminal device).

[0428] Case 2:

[0429] The terminal device enters a non-allowed area of ​​the first network. At this time, optionally, the terminal device can still remain in a registered state.

[0430] As a way, the first AMF can restrict the terminal device from establishing a session and restrict the terminal device from obtaining related services. In addition, the first AMF can release all sessions related to the terminal device.

[0431] As another way, the first AMF can stop exchanging other information with the terminal device except for mobility-related data. That is, at this time, the first AMF can only exchange information related to mobility with the terminal device.

[0432] S317-1, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a message #K to the second AMF. Correspondingly, the second AMF receives the message #K.

[0433] The message #K includes third information. The third information indicates one or more of the following:

[0434] Instruct the terminal device to enter the mobility restriction area of ​​the first network; instruct the terminal device to be deregistered; instruct the release of all sessions of the terminal device; instruct the cessation of information interaction with the terminal device; instruct the update of the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first TA, which is the TA where the terminal device is located in the second network.

[0435] Specifically, the first AMF can find the second AMF according to the first policy obtained in S311 and the association relationship saved in S309, and send message #K to the second AMF.

[0436] It is understandable that the present application does not limit the execution order between S316-1 and S317-1. As a case, S317-1 can also be executed before S316-1.

[0437] S318-1, the second AMF stops providing services to the terminal device according to message #K.

[0438] Case 1:

[0439] The terminal device enters a forbidden area of ​​the first network.

[0440] As a way, the second AMF can send a message #L (for example, a deregistration request message) to the terminal device according to the third information. Accordingly, the terminal device receives the message #L. The message #L is used to deregister the terminal device. Optionally, the message #L may also include reason information for deregistering the terminal device, and the reason information indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0441] The second AMF executes the deregistration process of the terminal device. The deregistration process includes releasing the session of the terminal device in the second network, and releasing the association relationship between the terminal device and the second PCF. In addition, the terminal device can send a deregistration reception message to the second AMF. Accordingly, the second AMF receives the deregistration reception message. The signal connection can be released between the terminal device, the second RAN, and the second AMF. Specifically, the second AMF can instruct the second RAN to release the signal connection between the second RAN and the terminal device, and accordingly, the second RAN can release the signal connection between the terminal device and the terminal device, and the terminal device can also release the signal connection between the second RAN and the second RAN.

[0442] Case 2:

[0443] The terminal device enters a non-allowed area of ​​the first network. At this time, optionally, the terminal device can still remain in a registered state.

[0444] As a way, the second AMF can restrict the terminal device from establishing a new session and restrict the terminal device from obtaining related services according to the third information. In addition, the second AMF can release all sessions of the terminal device in the second network.

[0445] As another way, the second AMF can stop exchanging other information with the terminal device except information related to mobility according to the third information. That is to say, at this time, the second AMF can only exchange information related to mobility with the terminal device.

[0446] In addition, optionally, for the above-mentioned situation 1 and situation 2, the second AMF can also update the mobility restriction area list of the terminal device in the second network based on the third information, and the updated mobility restriction area list of the terminal device in the second network includes the first area (TA), and the first area is the area where the terminal device is currently located.

[0447] After S313, as the terminal device moves, as a second case, the terminal device does not enter the mobility restriction area of ​​the first network, but enters the mobility restriction area of ​​the second network. For this case, the method 300 also includes the following steps.

[0448] S314-2, the terminal device sends a message #M to the second AMF. Correspondingly, the second AMF receives the message #M.

[0449] This message #M is used to request to update the mobility registration of the terminal device in the second network.

[0450] It can be understood that, in the second network, if the terminal device leaves the current registration area, the terminal device sends the message #M.

[0451] S315-2, the second AMF determines whether the terminal device has entered the mobility restriction area of ​​the second network.

[0452] For example, the second AMF determines whether the terminal device enters a prohibited area of ​​the second network.

[0453] For another example, the second AMF determines whether the terminal device enters a non-allowed area of ​​the second network.

[0454] S316-2, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends message #N to the first AMF. Correspondingly, the first AMF receives message #N.

[0455] The message #N includes fifth information. The fifth information is used to indicate that the terminal device has entered the mobility restriction area of ​​the second network.

[0456] Specifically, the second AMF can find the first AMF according to the second policy obtained in S312 and the association relationship saved in S304, and send message #N to the first AMF.

[0457] S317-2, the first AMF determines whether the terminal device enters the mobility restriction area of ​​the first network based on message #N.

[0458] S318-2, when the terminal device does not enter the mobility restriction area of ​​the first network, the first AMF sends a message #P to the second AMF. Correspondingly, the second AMF receives the message #P.

[0459] The message #P includes sixth information. The sixth information is used to indicate any one of the following:

[0460] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located in the second network.

[0461] Exemplarily, the message #P is a terminal device context update message.

[0462] S319-2, the second AMF provides services to the terminal device according to message #P.

[0463] As a case, the device in the second network may accept the mobility registration update request of the terminal device according to the sixth information, and send a mobility registration update accept message to the terminal device.

[0464] Optionally, the second AMF may also update the mobility restriction area list of the terminal device in the second network according to the sixth information in the message #P, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area.

[0465] According to an embodiment of the present application, the first AMF in the first network and the second AMF in the second network can collaboratively manage the mobility of the terminal device so that the mobility restrictions of the terminal device by the first network and the second network are consistent.

[0466] Figure 4 The method 400 proposed in the present application is shown, in which the first network element is a UDM. Specifically, the method 400 includes the following steps.

[0467] Among them, the first network includes a first AMF, an AUSF, an UDM, a first RAN, and a first PCF, and the second network includes a second AMF, a second RAN, and a second PCF.

[0468] S401, the terminal device completes the registration process in the first network.

[0469] In the process of the terminal device registering to the first network, the UDM can obtain information #100 (ie, the first information) from the first AMF in the first network.

[0470] Information #100 includes the identifier of the first AMF. In other words, information #100 is used by the UDM to determine the first AMF in the first network. For information #100, reference may be made to the description in S301.

[0471] S402: The terminal device sends a message #1 to the second RAN. Correspondingly, the second RAN receives the message #1.

[0472] This message #1 includes the AN parameter.

[0473] In the embodiment of the present application, the terminal device further obtains information #200 (ie, second information), and the information #200 is used to indicate that the terminal device enters a multi-connection state. For the manner in which the terminal device obtains information #200, reference may be made to S302.

[0474] In addition, the message #1 also indicates that the terminal device is in a multi-connection state.

[0475] Optionally, the message #1 may explicitly indicate that the terminal device is in a multi-connection state. For example, the message #1 may also include indication information (ie, information #200) indicating that the terminal device is in a multi-connection state.

[0476] Exemplarily, the message #1 is an AN message.

[0477] Taking the example that message #1 explicitly indicates that the terminal device is in a multi-connection state, as a case, the indication information that the terminal device is in a multi-connection state can be included in the registration request message. That is, the AN message can include AN parameters and the registration request message, and the registration request message includes the indication information that the terminal device is in a multi-connection state.

[0478] For example, an additional indication information may be carried in the registration request message to indicate that the registration request is for multiple connections.

[0479] For another example, in the registration request message, the registration type information may indicate multi-connection registration.

[0480] As another case, the indication information that the terminal device is in a multi-connection state may be included in the AN parameter. That is, the AN message includes the AN parameter, and the AN parameter includes the indication information that the terminal device is in a multi-connection state.

[0481] As another case, the AN message includes AN parameters, a registration request message, and indication information that the terminal device is in a multi-connection state. That is, the AN parameters, the registration request message, and indication information that the terminal device is in a multi-connection state exist in parallel.

[0482] S403: The second RAN selects an AMF according to the AN parameters (the AMF selected by the second RAN is recorded as the second AMF).

[0483] As a method, the second RAN can select an AMF with multi-connection capability based on the indication information that the terminal device is in a multi-connection state.

[0484] S404: The second RAN sends message #2 to the second AMF. Correspondingly, the second AMF receives message #2.

[0485] This message #2 is used to indicate that the terminal device is in a multi-connection state.

[0486] As a method, the message #2 may explicitly indicate that the terminal device is in a multi-connection state. For example, the message #2 includes indication information that the terminal device is in a multi-connection state. In S402, if the indication information that the terminal device is in a multi-connection state is included in the registration request message, the message #2 may be the registration request message.

[0487] Of course, the message #2 may also be other types of messages.

[0488] S405, the second AMF selects AUSF.

[0489] S406, the terminal device, the second AMF, AUSF, and UDM interact to complete the security process.

[0490] Regarding this, please refer to S306.

[0491] S407: The second AMF sends message #3 to the UDM. Accordingly, the UDM receives message #3.

[0492] The message #3 is used to indicate that the terminal device is in a multi-connection state. For example, the message #3 includes indication information that the terminal device is in a multi-connection state. Exemplarily, the message #3 is a terminal device context registration request message.

[0493] As a method, the message #3 may also include information #300 (ie, the fourth information). The information #300 includes the identifier of the second AMF. In other words, the information #300 is used by the UDM to determine the second AMF. For example, the information #300 is the 5G-GUTI corresponding to the second AMF.

[0494] Alternatively, the GUAMI corresponding to the second AMF.

[0495] It can be understood that UDM can save the association relationship between the first AMF, the second AMF and the terminal device based on the indication information that the terminal device is in a multi-connection state, for example, save the association relationship between the identifier of the first AMF, the identifier of the second AMF and the identifier of the terminal device.

[0496] S408, UDM determines that the terminal device is connected to the first network and the second network, and associates the terminal device, the first AMF and the second AMF.

[0497] The following describes a method in which the UDM determines that the terminal device is connected to the first network and the second network at the same time.

[0498] Method 1:

[0499] The UDM may determine that the terminal device is connected to the first network and the second network at the same time according to the indication information in message #3 that the terminal device is in a multi-connection state.

[0500] Method 2:

[0501] If the UDM detects that the context for the terminal device stored by the UDM includes information about the first AMF and the second AMF, the UDM determines that the terminal device is connected to the first network and the second network at the same time.

[0502] S409, the first AMF obtains the first strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #1 to the UDM, and the notification message #1 indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0503] The following describes how the first AMF obtains the first policy.

[0504] Method 1:

[0505] The first AMF obtains first configuration information, which indicates to the first AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #1 to the UDM.

[0506] The first AMF may obtain the first policy according to the first configuration information.

[0507] Method 2:

[0508] UDM sends message #4-1 to the first AMF. This message #4-1 is used for subscription: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #1 to UDM.

[0509] The first AMF can obtain the first strategy based on the message #4-1.

[0510] Method 3:

[0511] The UDM sends a message #4-2 to the first PCF. The message #4-2 is used to instruct the first PCF to update the local policy of the first AMF.

[0512] Further, the first PCF may send the first policy update information to the first AMF according to the message #4-2 to update the local policy of the first AMF. The updated local policy of the first AMF is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #1 to the UDM.

[0513] S410, the second AMF obtains a second strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends fifth information to the UDM, and the fifth information indicates that the terminal device enters the mobility restriction area of ​​the second network.

[0514] The following describes how the second AMF obtains the second policy.

[0515] Method 1:

[0516] The second AMF obtains second configuration information, and the second configuration information indicates to the second AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends fifth information to the UDM.

[0517] The second AMF may obtain the second policy according to the second configuration information.

[0518] Method 2:

[0519] UDM sends message #5-1 to the second AMF. Message #5-1 is used for subscription: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends the fifth information to UDM.

[0520] The UDM may obtain the second strategy according to message #5-1.

[0521] Method 3:

[0522] The UDM sends a message #5-2 to the second PCF. The message #5-2 is used to instruct the second PCF to update the local policy of the second AMF.

[0523] Furthermore, the second PCF can update the local policy of the second AMF based on the message #5-2. The local policy of the second AMF after the update is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a message to the UDM to instruct the terminal device to enter the mobility restriction area of ​​the second network.

[0524] S411, the second AMF sends a registration reception response message to the terminal device.

[0525] That is to say, the terminal device completes the registration process in the second network.

[0526] After S411, as the terminal device moves, as a first case, the terminal device enters the mobility restriction area of ​​the first network, but the terminal device does not enter the mobility restriction area of ​​the second network. For this case, the method 400 also includes the following steps.

[0527] S412-1, the terminal device sends message #6 to the first AMF. Correspondingly, the first AMF receives message #6.

[0528] The message #6 is used to request to update the mobility registration of the terminal device in the first network.

[0529] Regarding this, please refer to S314-1.

[0530] S413-1, the first AMF determines whether the terminal device has entered the mobility restriction area of ​​the first network based on the message #6.

[0531] Regarding this, please refer to S315-1.

[0532] S414-1: When the terminal device enters the mobility restriction area of ​​the first network, the first AMF stops providing services to the terminal device.

[0533] For details about this process, please refer to S316-1 and will not be described in detail here.

[0534] For example, the first AMF may send message #7 to the terminal device. Accordingly, the terminal device receives message #7. Message #7 is used to deregister the terminal device in the first network.

[0535] S415-1, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends message #8 to the UDM. Accordingly, the UDM receives message #8.

[0536] Specifically, the first AMF may send message #8 to the UDM based on the first policy obtained in S409 when the terminal device enters the mobility restriction area of ​​the first network.

[0537] This message #8 (ie, notification message #1 in S409) is used to indicate that the terminal device has entered the mobility restriction area of ​​the first network.

[0538] In addition, the message #8 may include the identifier of the terminal device, and optionally, may also include the identifier of the first AMF.

[0539] It is understandable that the present application does not limit the execution order between S414-1 and S415-1. As a case, S415-1 may also be executed before S414-1.

[0540] S416-1, UDM sends message #9 to the second AMF according to message #8. Correspondingly, the second AMF receives message #9.

[0541] Specifically, since UDM associates the terminal device, the first AMF and the second AMF in S408, after receiving message #8, UDM can determine the second AMF associated with the terminal device and send message #9 to the second AMF.

[0542] Message #9 includes third information indicating at least one of the following:

[0543] Instructing the terminal device to enter the mobility restriction area of ​​the first network; instructing to deregister the terminal device; instructing to release all sessions of the terminal device; instructing to stop information interaction with the terminal device; instructing to update the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is currently located in the second network.

[0544] S417-1, the second AMF stops providing services to the terminal device according to message #9.

[0545] For details about this process, please refer to S318-1 and will not be repeated here.

[0546] After S411, as the terminal device moves, as a second case, the terminal device enters the mobility restriction area of ​​the second network, but the terminal device does not enter the mobility restriction area of ​​the first network. For this case, the method 400 also includes the following steps.

[0547] S412-2, the terminal device sends message #10 to the second AMF. Correspondingly, the second AMF receives message #10.

[0548] The message #10 is used to request to update the mobility registration of the terminal device in the second network.

[0549] Regarding this, please refer to S314-2.

[0550] S413-2, the second AMF determines whether the terminal device has entered the mobility restriction area of ​​the second network.

[0551] Regarding this, please refer to S315-2.

[0552] S414-2, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends message #11 to the UDM. Accordingly, the UDM receives message #11.

[0553] Specifically, the second AMF can send message #11 to the UDM based on the second policy obtained in S410 when the terminal device enters the mobility restriction area of ​​the second network.

[0554] The message #11 includes fifth information. The fifth information is used to indicate that the terminal device has entered the mobility restriction area of ​​the second network.

[0555] In addition, the message #11 may include the identifier of the terminal device, and optionally, may also include the identifier of the second AMF.

[0556] S415-2, UDM determines whether the terminal device enters the mobility restriction area of ​​the first network according to the message #11.

[0557] The following describes several ways in which the UDM determines whether the terminal device enters the mobility restriction area of ​​the first network:

[0558] Method A:

[0559] Method A includes the following steps:

[0560] Step 1: UDM sends a query message to the first AMF according to message #11. The query message is used to query whether the terminal device enters the mobility restriction area of ​​the first network.

[0561] Specifically, UDM associates the terminal device, the first AMF and the second AMF in S408. UDM can determine the first AMF associated with the terminal device based on message #11 and send a query message to the first AMF.

[0562] Step 2: The first AMF sends a response message to the UDM based on the query message.

[0563] As a method, the response message may directly indicate whether the terminal device enters the mobility restriction area of ​​the first network.

[0564] As a method, the response message may indirectly indicate whether the terminal device has entered the mobility restriction area of ​​the first network. For example, the response message may include information about the area where the terminal device is located in the first network.

[0565] Step 3: The UDM determines whether the terminal device enters the mobility restriction area of ​​the first network based on the response message.

[0566] It can be understood that if the response message includes the area information of the terminal device in the first network, UDM can determine whether the terminal device is currently in the mobility restriction area of ​​the first network based on the mobility restriction area information of the terminal device in the first network stored in the contract data of the terminal device.

[0567] Method B:

[0568] Since the first AMF obtains the first policy in S409, if the UDM does not receive notification message #1 from the first AMF, which notification message #1 indicates that the terminal device enters the mobility restriction area of ​​the first network, the UDM can determine that the terminal device does not enter the mobility restriction area of ​​the first network. If the UDM receives the notification message #1 from the first AMF, the UDM can determine that the terminal device enters the mobility restriction area of ​​the first network.

[0569] S416-2, when the terminal device does not enter the mobility restriction area of ​​the first network, the UDM sends message #12 to the second AMF. Accordingly, the second AMF receives message #12.

[0570] The message #12 includes sixth information. The sixth information is used to indicate any one of the following:

[0571] Indicates that the terminal device has not entered the mobility restriction area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located in the second network.

[0572] Exemplarily, the message #12 is a terminal device context update message.

[0573] S417-2, the second AMF provides services to the terminal device according to message #12.

[0574] Regarding this process, please refer to S319-2 and will not be repeated here.

[0575] According to the embodiment of the present application, the UDM in the first network can collaboratively manage the mobility of the terminal device in the first network and the second network, so that the mobility restrictions of the terminal device in the first network and the second network remain consistent.

[0576] Figure 5 The method 500 proposed in the present application is shown, in which the first network element is a first PCF. Specifically, the method 500 includes the following steps.

[0577] S501, the terminal device completes the registration process in the first network.

[0578] S502: The terminal device sends a message #a to the second RAN. Correspondingly, the second RAN receives the message #a.

[0579] The message #a includes the AN parameter. In addition, the message #a also indicates that the terminal device is in a multi-connection state.

[0580] For the process, please refer to S402 and will not be described in detail here.

[0581] S503: The second RAN selects an AMF according to the AN parameters (the AMF selected by the second RAN is recorded as the second AMF).

[0582] As a method, the second RAN can select an AMF with multi-connection capability based on the indication information that the terminal device is in a multi-connection state.

[0583] S504: The second RAN sends a message #b to the second AMF. Correspondingly, the second AMF receives the message #b.

[0584] This message #b is used to indicate that the terminal device is in a multi-connection state.

[0585] For the process, please refer to S404 and will not be described in detail here.

[0586] S505, the second AMF selects AUSF.

[0587] S506, the terminal device, the second AMF, AUSF, and UDM interact to complete the security process.

[0588] S507: The second AMF sends a message #c to the UDM. Correspondingly, the UDM receives the message #c.

[0589] The message #c is used to indicate that the terminal device is in a multi-connection state. For example, the message #c includes indication information that the terminal device is in a multi-connection state. Exemplarily, the message #c is a terminal device context registration request message.

[0590] The UDM may update the state of the terminal device according to the message #c, and the state of the terminal device after the update is a multi-connection state. In addition, the UDM may send a response message to the second AMF for the message #c.

[0591] S508: The second AMF sends a message #d to the second PCF. Correspondingly, the second PCF receives the message #d.

[0592] The message #d is used to indicate that the terminal device is in a multi-connection state. For example, the message #d includes indication information that the terminal device is in a multi-connection state. Exemplarily, the message #d can be used to establish an AM policy association.

[0593] In the embodiment of the present application, the second PCF determines that the terminal device is in a multi-connection state according to the message #d, and the second PCF can establish an association relationship with the first PCF to manage the mobility of the terminal device in collaboration with the first PCF. For example, the second PCF can associate the terminal device, the first PCF and the second PCF, or associate the terminal device and the first PCF.

[0594] As a way, the second PCF can select a suitable first PCF and associate the terminal device, the first PCF and the second PCF. In addition, the second PCF can also send an identifier of the second PCF to the first PCF.

[0595] As another way, the terminal device may obtain the identifier of the first PCF from the first AMF during access to the first network. In S502, the message #a sent by the terminal device to the second RAN may also include the identifier of the first PCF. Further, the second RAN may send the identifier of the first PCF to the second PCF through the second AMF. Further, the second PCF may associate the terminal device, the first PCF and the second PCF. In addition, the second PCF may also send the identifier of the second PCF to the first PCF.

[0596] S509, UDM sends message #e to the first PCF. Correspondingly, the first PCF receives message #e.

[0597] The message #e is used to indicate that the terminal device is in a multi-connection state. For example, the message #e includes indication information that the terminal device is in a multi-connection state.

[0598] In an embodiment of the present application, the first PCF determines that the terminal device is in a multi-connection state according to the message #e, and the first PCF can establish an association relationship with the second PCF to manage the mobility of the terminal device in collaboration with the second PCF. For example, the first PCF can associate the terminal device, the first PCF and the second PCF, or associate the terminal device and the second PCF. The way in which the first PCF obtains the identifier of the second PCF can refer to S508.

[0599] It is understandable that the present application does not limit the execution order between S508 and S509.

[0600] S510, the first AMF obtains a first strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #A to the first PCF, and the notification message #A indicates that the terminal device enters the mobility restriction area of ​​the first network.

[0601] The following describes how the first AMF obtains the first policy.

[0602] Method 1:

[0603] The first AMF obtains first configuration information, which indicates to the first AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #A to the first PCF.

[0604] The first AMF may obtain the first policy according to the first configuration information.

[0605] Method 2:

[0606] The first PCF sends a message #f-1 to the first AMF. The message #f-1 is used to subscribe: if the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #A to the first PCF.

[0607] The first AMF may obtain the first policy according to the message #f-1.

[0608] Method 3:

[0609] The first PCF sends a message #f-2 to the first AMF. The message #f-2 is used to update the local policy of the first AMF.

[0610] Furthermore, the first AMF can update the local policy of the first AMF based on the message #f-2. After the update, the local policy of the first AMF is: if the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a notification message #A to the first PCF.

[0611] S511, the second AMF obtains the second strategy, which is: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a notification message #B to the second PCF, and the notification message #B indicates that the terminal device enters the mobility restriction area of ​​the second network.

[0612] The following describes how the second AMF obtains the second policy.

[0613] Method 1:

[0614] The second AMF obtains second configuration information, which indicates to the second AMF: if the terminal device is in a multi-connection state, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a notification message #B to the UDM.

[0615] The second AMF may obtain the second policy according to the second configuration information.

[0616] Method 2:

[0617] The second PCF sends a message #g-1 to the second AMF. The message #g-1 is used to subscribe: if the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a notification message #B to the second PCF.

[0618] The ER AMF may obtain the second policy according to the message #g-1.

[0619] Method 3:

[0620] The second PCF sends a message #g-2 to the second AMF. The message #g-2 is used to update the local policy of the second AMF.

[0621] Furthermore, the second AMF can update the local policy of the second AMF based on the message #g-2. The local policy of the second AMF after the update is: if the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a notification message #B to the second PCF.

[0622] S512, the second AMF sends a registration reception response message to the terminal device.

[0623] That is to say, the terminal device completes the registration process in the second network.

[0624] After S512, as the terminal device moves, as a first case, the terminal device enters the mobility restriction area of ​​the first network, but the terminal device does not enter the mobility restriction area of ​​the second network. For this case, the method 500 also includes the following steps.

[0625] S513-1, the terminal device sends a message #h to the first AMF. Correspondingly, the first AMF receives the message #h.

[0626] This message #h is used to request a mobility registration update for the terminal device in the first network.

[0627] Regarding this, please refer to S314-1.

[0628] S514-1, the first AMF determines whether the terminal device has entered the mobility restriction area of ​​the first network based on the message #h.

[0629] Regarding this, please refer to S315-1.

[0630] S515-1: When the terminal device enters the mobility restriction area of ​​the first network, the first AMF stops providing services to the terminal device.

[0631] For details about this process, please refer to S316-1 and will not be described in detail here.

[0632] For example, the first AMF may send a message #i to the terminal device. Accordingly, the terminal device receives the message #i. The message #i is used to deregister the terminal device in the first network.

[0633] S516-1, when the terminal device enters the mobility restriction area of ​​the first network, the first AMF sends a message #j to the first PCF. Correspondingly, the first PCF receives the message #j.

[0634] Specifically, the first AMF can send message #j to the first PCF based on the first policy obtained in S510 when the terminal device enters the mobility restriction area of ​​the first network.

[0635] This message #j (ie, the notification message #A in S510) is used to indicate that the terminal device has entered the mobility restriction area of ​​the first network.

[0636] In addition, the message #j may include the identifier of the terminal device.

[0637] It is understandable that the present application does not limit the execution order between S515-1 and S516-1. As a case, S516-1 can also be executed before S515-1.

[0638] S517-1, the first PCF sends the third information to the second AMF through the second PCF according to the message #j. Correspondingly, the second AMF receives the third information from the first PCF through the second PCF.

[0639] The third information indicates one or more of the following:

[0640] Instructing the terminal device to enter the mobility restriction area of ​​the first network; instructing to deregister the terminal device; instructing to release all sessions of the terminal device; instructing to stop information interaction with the terminal device; instructing to update the mobility restriction area list of the terminal device in the second network, and after the update, the mobility restriction area list of the terminal device in the second network includes the first area, and the first area is the area where the terminal device is currently located in the second network.

[0641] Specifically, the first PCF can determine the second PCF associated with the terminal device according to the message #j, and send the third information to the second PCF. Further, the second PCF can send the third information to the second AMF.

[0642] S518-1, the second AMF stops providing services to the terminal device according to the third information.

[0643] For details about this process, please refer to S318-1 and will not be repeated here.

[0644] For example, the second AMF may send a message #k to the terminal device. Accordingly, the terminal device receives the message #k. The message #k is used to deregister the terminal device.

[0645] After S512, as the terminal device moves, as a second case, the terminal device does not enter the mobility restriction area of ​​the first network, but enters the mobility restriction area of ​​the second network. For this case, the method 500 also includes the following steps.

[0646] S513-2, the terminal device sends a message #m to the second AMF. Correspondingly, the second AMF receives the message #m.

[0647] The message #m is used to request a mobility registration update for the terminal device in the second network.

[0648] Regarding this, please refer to S314-2.

[0649] S514-2, the second AMF determines whether the terminal device has entered the mobility restriction area of ​​the second network.

[0650] Regarding this, please refer to S315-2.

[0651] S515-2, when the terminal device enters the mobility restriction area of ​​the second network, the second AMF sends a message #n to the second PCF. Correspondingly, the second PCF receives the message #n.

[0652] This message #n (ie, notification message #B in S511) is used to indicate that the terminal device has entered the mobility restriction area of ​​the second network.

[0653] Specifically, the second AMF may send a message #n to the second PCF according to the second policy acquired in S511. The message #n also includes an identifier of the terminal device.

[0654] S516-2, the second PCF sends a message #p to the first PCF. Correspondingly, the first PCF receives the message #p.

[0655] Specifically, the second PCF can determine the first PCF associated with the terminal device according to the message #n, and send a message #p to the first PCF, where the message #p includes the fifth information. The fifth information is used to indicate that the terminal device has entered the mobility restriction area of ​​the second network.

[0656] S517-2: The first PCF determines whether the terminal device enters the mobility restriction area of ​​the first network based on the message #p.

[0657] The following describes several ways in which the first PCF determines whether the terminal device enters the mobility restriction area of ​​the first network:

[0658] Method A:

[0659] Method A includes the following steps:

[0660] Step 1: The first PCF sends a query message to the first AMF based on the fifth information, where the query message is used to query whether the terminal device enters the mobility restriction area of ​​the first network.

[0661] Step 2: The first AMF sends a response message to the first PCF based on the query message.

[0662] As a method, the response message may directly indicate whether the terminal device enters the mobility restriction area of ​​the first network.

[0663] As a method, the response message may indirectly indicate whether the terminal device has entered the mobility restriction area of ​​the first network. For example, the response message may include information about the area where the terminal device is located in the first network.

[0664] Step 3: The first PCF determines whether the terminal device enters the mobility restriction area of ​​the first network based on the response message.

[0665] It can be understood that if the response message includes the area information of the terminal device in the first network, the first PCF can determine whether the terminal device is currently in the mobility restriction area of ​​the first network based on the mobility restriction area information of the terminal device in the first network stored in the subscription data of the terminal device.

[0666] Method B:

[0667] Since the first AMF obtains the first policy in S510, if the first PCF does not receive a notification message #A from the first AMF, the notification message #A indicating that the terminal device has entered the mobility restriction area of ​​the first network, the first PCF can determine that the terminal device has not entered the mobility restriction area of ​​the first network. If the first PCF receives the notification message #A from the first AMF, the first PCF can determine that the terminal device has entered the mobility restriction area of ​​the first network.

[0668] S518-2, when the terminal device does not enter the mobility restriction area of ​​the first network, the first PCF sends the sixth information to the second AMF through the second PCF. Correspondingly, the second AMF receives the sixth information through the second PCF.

[0669] The sixth information is used to indicate any one of the following:

[0670] Indicates that the terminal device has not entered the mobility restricted area of ​​the first network; indicates acceptance of the mobility registration update of the terminal device; indicates updating the mobility restricted area list of the terminal device in the second network, and after the update, the mobility restricted area list of the terminal device in the second network does not include the first area, and the first area is the area where the terminal device is located in the second network.

[0671] Specifically, the first PCF can find the second PCF according to the saved association relationship between the first PCF, the second PCF, and the terminal device, and send the sixth information to the second PCF. Further, the second PCF can send the sixth information to the second AMF.

[0672] S519-2, the second AMF provides services to the terminal device according to the sixth information.

[0673] Regarding this process, please refer to S319-2 and will not be repeated here.

[0674] According to an embodiment of the present application, the first PCF in the first network and the second PCF in the second network can collaboratively manage the mobility of the terminal device in the first network and the second network, so that the mobility restrictions of the terminal device in the first network and the second network are consistent.

[0675] The above is an introduction to the method proposed in this application. Figure 6 A communication device is provided in an embodiment of the present application, and the communication device includes a transceiver unit and a processing unit.

[0676] The transceiver unit may be used to implement the corresponding information transceiver function. The transceiver unit may also be called a communication interface or a communication unit. The processing unit may be used to perform processing operations.

[0677] Exemplarily, the device also includes a storage unit, which can be used to store instructions and / or data, and the processing unit can read the instructions and / or data in the storage unit so that the device implements the actions of the device in the aforementioned various method embodiments.

[0678] As an implementation method, the device can be the first AMF in the aforementioned embodiment, or a component (such as a chip) of the first AMF. Among them, the transceiver unit and the processing unit can be used to implement the relevant operations of the first AMF.

[0679] For example, the transceiver unit may be used to implement S310, S316-1, and S317-1, and the processing unit may be used to implement S315-1.

[0680] For another example, the transceiver unit may be used to implement S318-2, and the processing unit may be used to implement S317-2.

[0681] For another example, the transceiver unit may be used to implement S414 - 1 and S415 - 1 , and the processing unit may be used to implement S413 - 1 .

[0682] For another example, the transceiver unit may be used to implement S515 - 1 and S516 - 1 , and the processing unit may be used to implement S514 - 1 .

[0683] As another implementation, the device may be the second AMF in the aforementioned embodiment, or a component (such as a chip) of the second AMF. The transceiver unit and the processing unit may be used to implement the relevant operations of the second AMF.

[0684] For example, the transceiver unit can be used to implement S307, S309, S313, and S318-1.

[0685] For another example, the transceiver unit can be used to implement S316-2 and S319-2, and the processing unit can be used to implement S315-2.

[0686] For another example, the transceiver unit can be used to implement S417 - 1.

[0687] For another example, the transceiver unit may be used to implement S414 - 2 and S417 - 2, and the processing unit may be used to implement S413 - 2.

[0688] For another example, the transceiver unit can be used to implement S518 - 1.

[0689] For another example, the transceiver unit may be used to implement S515 - 2 and S519 - 2, and the processing unit may be used to implement S514 - 2.

[0690] As another implementation, the device may be the UDM in the above embodiment, or a component (such as a chip) of the UDM. The transceiver unit and the processing unit may be used to implement related operations of the UDM.

[0691] For example, the transceiver unit may be used to implement S416 - 1 , and the processing unit may be used to implement S408 .

[0692] For another example, the transceiver unit may be used to implement S461 - 2 , and the processing unit may be used to implement S408 and S415 - 2 .

[0693] As another implementation, the device may be the first PCF in the aforementioned embodiment, or a component (such as a chip) of the first PCF. The transceiver unit and the processing unit may be used to implement related operations of the first PCF.

[0694] For example, a transceiver unit may be used to implement S517 - 1 .

[0695] For another example, the transceiver unit may be used to implement S518 - 2 , and the processing unit may be used to implement S517 - 2 .

[0696] As another implementation, the device may be the second PCF in the aforementioned embodiment, or a component (such as a chip) of the second PCF. The transceiver unit and the processing unit may be used to implement related operations of the second PCF.

[0697] For example, a transceiver unit may be used to implement S517 - 1 .

[0698] For another example, the transceiver unit can be used to implement S516-2 and S518-2.

[0699] As another implementation, the device may be the second RAN in the foregoing embodiment, or a component (such as a chip) of the second RAN. The transceiver unit and the processing unit may be used to implement related operations of the second RAN.

[0700] For example, the transceiver unit may be used to implement S304, and the processing unit may be used to implement S303.

[0701] For another example, the transceiver unit may be used to implement S404, and the processing unit may be used to implement S403.

[0702] For another example, the transceiver unit may be used to implement S504, and the processing unit may be used to implement S503.

[0703] As another implementation, the device may be the terminal device in the aforementioned embodiment, or a component (such as a chip) of the terminal device. The transceiver unit and the processing unit may be used to implement relevant operations of the terminal device.

[0704] For example, the transceiver unit may be used to implement S302 and S314 - 1 .

[0705] For another example, the transceiver unit can be used to implement S302 and S314 - 2.

[0706] For another example, the transceiver unit may be used to implement S402 and S412 - 1 .

[0707] For another example, the transceiver unit may be used to implement S402 and S412 - 2 .

[0708] For another example, the transceiver unit may be used to implement S502 and S513 - 1 .

[0709] For another example, the transceiver unit can be used to implement S502 and S513 - 2.

[0710] It can be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0711] The transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0712] In addition, the above-mentioned transceiver unit may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit.

[0713] Figure 7 Another communication device provided in an embodiment of the present application includes: a processor and a communication interface. The processor is used to execute a program or instruction stored in a memory, or read data stored in a memory, to perform related actions in the above method embodiments. Exemplarily, the processor may be one or more. The communication interface is used to receive and / or send signals.

[0714] Exemplarily, the communication device may further include a memory, and the memory is used to store computer programs or instructions and / or data. The memory may be integrated with the processor, or may be separately arranged. Of course, the communication device may also not include a memory, and the memory may be arranged outside the communication device. Exemplarily, the memory may be one or more.

[0715] Exemplarily, the processor, the communication interface, and the memory are interconnected via a bus; the bus may be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The above bus may be divided into an address bus, a data bus, and a control bus, etc. For ease of representation, only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0716] It is to be understood that the processor mentioned in the embodiments of the present application may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and a NP. The processor may further include a hardware chip. The above-mentioned hardware chip may be an application specific integrated circuit (ASIC), a programmable logic device (PLD). The above-mentioned PLD may be a complex programmable logic device (CPLD), a field programmable gate array (FPGA), a generic array logic (GAL) or any combination thereof.

[0717] It can also be understood that the memory mentioned in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache.

[0718] It is understood that if the embodiments of the present application are implemented in the form of software and sold or used as independent products, the corresponding programs (also referred to as codes or instructions) can be stored in a readable storage medium. Therefore, the present application also provides a readable storage medium, including a program, which, when executed on a device or computer, enables the device or computer to perform any possible implementation of the above scheme.

[0719] The readable storage media include: U disk, mobile hard disk, ROM, RAM, disk or CD and other media that can store program code.

[0720] The technical solution of the present application can be embodied in the form of a software product. Therefore, the present application also provides a program product, which includes: a program, when the program is run, enables a device or a computer to execute any possible implementation of the above solution.

[0721] In addition, the embodiment of the present application also provides a chip system (or chip). The chip system includes a processor and an interface circuit, the interface circuit is used to provide the processor with data, instructions or information transmission and / or reception, and the processor is used to execute any possible implementation of the above solution.

[0722] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: The method comprises: The communication device acquires first information during registration with the first network, wherein the first information includes an identifier of a first access and mobility management network element in the first network; The communication device acquires second information, where the second information is used to instruct the communication device to enter a multi-connection state; The communication device sends the first information to the second network in the process of registering to the second network according to the second information, and the first information is used by a second access and mobility management network element in the second network to determine the first access and mobility management network element.

2. The method according to claim 1, characterized in that The first information is a globally unique temporary identifier corresponding to the first access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the first access and mobility management network element.

3. The method according to claim 2, characterized in that The communication device obtains first information during registration with the first network, including: The communication device sends a registration request message to the first network; The communication device receives a registration acceptance message from the first access and mobility management network element in the first network, where the registration acceptance message includes a globally unique temporary identifier corresponding to the first access and mobility management network element.

4. The method according to claim 3, characterized in that The registration acceptance message also includes a globally unique access and mobility management network element identifier corresponding to the first access and mobility management network element.

5. The method according to any one of claims 1 to 4, characterized in that The communication device acquires second information, including: The communication device acquires the second information based on an operation instruction of a user; or The communication device obtains the second information from the first access and mobility management network element.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: The communication device sends the second information to the second network.

7. A communication method, characterized in that: The method is applied in a scenario where a communication device accesses a first network and a second network, the first network includes a first network element, and the method includes: The first network element determines whether the communication device enters a mobility restriction area of ​​the first network; When the communication device enters the mobility restriction area of ​​the first network, the first network element sends third information to the second network, where the third information is used to instruct the second network to stop providing services to the communication device; and the state of the communication device in the first network is a state of stopping obtaining services.

8. The method according to claim 7, characterized in that The first network element is a first access and mobility management network element, and the method further includes: The first network element receives second information and fourth information from a second access and mobility management network element in the second network, the second information being used to indicate that the communication device is in a multi-connection state, and the fourth information including an identifier of the second access and mobility management network element.

9. The method according to claim 8, characterized in that The fourth information is a globally unique temporary identifier corresponding to the second access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the second access and mobility management network element.

10. The method according to claim 7, characterized in that The first network element is a unified data management network element, and the method further includes: In the process of the communication device registering with the first network, the first network element obtains first information from a first access and mobility management network element in the first network, where the first information includes an identifier of the first access and mobility management network element; During the process of the communication device registering to the second network, the first network element obtains second information and fourth information from the second access and mobility management network element in the second network, the second information is used to indicate that the communication device is in a multi-connection state, and the fourth information includes an identifier of the second access and mobility management network element.

11. The method according to claim 10, characterized in that The first information is a globally unique temporary identifier corresponding to the first access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the first access and mobility management network element; The fourth information is a globally unique temporary identifier corresponding to the second access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the second access and mobility management network element.

12. The method according to any one of claims 7 to 11, characterized in that: The third information is used to indicate one or more of the following: Instructing the communication device to enter the mobility restriction area of ​​the first network; instructing to deregister the communication device; instructing to release all sessions of the communication device; instructing to stop information interaction with the communication device; instructing to update the mobility restriction area list of the communication device in the second network, and after the update, the mobility restriction area list of the communication device in the second network includes a first area, and the first area is the area where the communication device is located.

13. The method according to claim 7, characterized in that The first network element is a first access and mobility management network element; The first network element determines whether the communication device enters a mobility restriction area of ​​the first network, including: The first network element receives a mobility registration update request message from the communication device; The first network element determines, according to the mobility registration update request message, whether the communication device enters a mobility restriction area of ​​the first network; The first network element sending the third information to the second network includes: The first network element sends the third information to a second access and mobility management network element in the second network.

14. The method according to claim 13, characterized in that The method further comprises: The first network element acquires first configuration information, where the first configuration information is used to instruct the first network element to: send the third information to the second access and mobility management network element if the communication device enters a mobility restriction area of ​​the first network; or, The first network element receives a first subscription message from the second access and mobility management network element, where the first subscription message is used to subscribe: if the communication device enters a mobility restriction area of ​​the first network, the first network element sends the third information to the second access and mobility management network element; or, The first network element receives first policy update information from a first policy control network element, and updates the local policy of the first network element according to the first policy update information. After the update, the local policy of the first network element is: if the communication device enters the mobility restriction area of ​​the first network, send the third information to the second access and mobility management network element; wherein, the first network includes the first policy control network element.

15. The method according to claim 7, characterized in that The first network element is a unified data management network element; The first network element determines whether the communication device enters a mobility restriction area of ​​the first network, including: The first network element receives a notification message from a first access and mobility management network element, the notification message indicating that the communication device enters a mobility restriction area of ​​the first network; The first network element determines, according to the notification message, that the communication device enters a mobility restriction area of ​​the first network; The first network element sending third information to the second network includes: The first network element sends the third information to a second access and mobility management network element in the second network.

16. The method according to claim 15, characterized in that The method further comprises: The first network element sends a first subscription message to the first access and mobility management network element, where the first subscription message is used to subscribe: if the communication device enters a mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element; or, The first network element sends a first indication message to the first policy control network element, and the first indication message is used to instruct the first policy control network element to update the local policy of the first access and mobility management network element. After the update, the local policy of the first access and mobility management network element is: if the communication device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends the notification message to the first network element, and the first network includes the first policy control network element.

17. The method according to claim 7, characterized in that The first network element determines whether the communication device enters a mobility restriction area of ​​the first network, including: The first network element receives fifth information from the second network, the fifth information indicating that the communication device enters a mobility restriction area of ​​the second network; The first network element determines, according to the fifth information, whether the communication device enters a mobility restriction area of ​​the first network.

18. The method according to claim 17, characterized in that The method further includes: when the communication device does not enter the mobility restriction area of ​​the first network, the first network element sends sixth information to the second network, where the sixth information is used to indicate any one of the following: Indicates that the communication device has not entered the mobility restricted area of ​​the first network; indicates that the mobility registration update request of the communication device is accepted; indicates that the mobility restricted area list of the communication device in the second network is updated, and after the update, the mobility restricted area list of the communication device in the second network does not include the first area, and the first area is the area where the communication device is located.

19. The method according to claim 18, characterized in that The first network element is a first access and mobility management network element; The method further comprises: The first network element sends a second subscription message to a second access and mobility management network element in the second network, and the second subscription message is used to subscribe: if the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element.

20. The method according to claim 18, characterized in that The first network element is a unified data management network element; The first network element receives fifth information from the second network, including: The first network element receives the fifth information from the second access and mobility management network element of the second network; The first network element determines, according to the fifth information, whether the communication device enters a mobility restriction area of ​​the first network, including: The first network element sends a query message to the first access and mobility management network element according to the fifth information, wherein the query message is used to query whether the communication device enters the mobility restriction area of ​​the first network; the first network element receives a response message to the query message from the first access and mobility management network element; the first network element determines whether the communication device enters the mobility restriction area of ​​the first network according to the response message; or, The first network element determines whether the communication device enters the mobility restriction area of ​​the first network according to whether a notification message is received from the first access and mobility management network element, wherein the notification message indicates that the communication device enters the mobility restriction area of ​​the first network; The first network element sends sixth information to the second network, including: The first network element sends sixth information to the second access and mobility management network element.

21. The method according to claim 20, characterized in that The method further comprises: The first network element sends a second subscription message to the second access and mobility management network element, where the second subscription message is used to subscribe: if the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element; or, The first network element sends a second indication message to the second policy control network element, and the second indication message is used to instruct the second policy control network element to update the local policy of the second access and mobility management network element. After the update, the local policy of the second access and mobility management network element is: if the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element.

22. A communication method, characterized in that: The method is applied in a scenario where a communication device accesses a first network and a second network, the first network includes a first network element, and the second network includes a second access and mobility management network element, and the method includes: In a case where the communication device enters a mobility restriction area of ​​the first network, the second access and mobility management network element receives third information from the first network element, the third information being used to instruct the second network to stop providing services to the communication device; The second access and mobility management network element stops providing services to the communication device according to the third information.

23. The method according to claim 22, characterized in that The first network element is a first access and mobility management network element, and the method further includes: The second access and mobility management network element receives first information and second information from the communication device, the first information including an identifier of the first access and mobility management network element, and the second information is used to indicate that the communication device is in a multi-connection state; The second access and mobility management network element sends the second information and fourth information to the first access and mobility management network element according to the first information, where the fourth information includes an identifier of the second access and mobility management network element.

24. The method according to claim 23, characterized in that The first information is a globally unique temporary identifier corresponding to the first access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the first access and mobility management network element; The fourth information is a globally unique temporary identifier corresponding to the second access and mobility management network element, or a globally unique access and mobility management network element identifier corresponding to the second access and mobility management network element.

25. The method according to any one of claims 22 to 24, characterized in that The second access and mobility management network element stops providing services to the communication device according to the third information, including: The second access and mobility management network element sends a deregistration request message to the communication device according to the third information, where the deregistration request message is used to deregister the communication device.

26. The method according to claim 25, characterized in that The deregistration request message further includes a reason for deregistering the communication device, where the reason is that the communication device enters a mobility restriction area of ​​the first network.

27. The method according to any one of claims 22 to 24, characterized in that The second access and mobility management network element stops providing services to the communication device according to the third information, including: The second access and mobility management network element releases all sessions of the communication device according to the third information.

28. The method according to any one of claims 22 to 27, characterized in that The method further comprises: The second access and mobility management network element updates the mobility restriction area list of the communication device in the second network according to the third information, and after the update, the mobility restriction area list of the communication device in the second network includes a first area, which is the area where the communication device is located.

29. The method according to any one of claims 22 to 28, characterized in that The method further comprises: The second access and mobility management network element receives a mobility registration update request message from the communication device; The second access and mobility management network element determines, according to the mobility registration update request message, whether the communication device enters a mobility restriction area of ​​the second network; In the case where the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends fifth information to the first network element, the fifth information indicating that the communication device enters the mobility restriction area of ​​the second network; The second access and mobility management network element receives sixth information from the first network element, where the sixth information indicates any one of the following: Indicating that the communication device has not entered the mobility restriction area of ​​the first network; indicating acceptance of the mobility registration update of the communication device; indicating updating the mobility restriction area list of the communication device in the second network, and after the update, the mobility restriction area list of the communication device in the second network does not include the first area, the first area being the area where the communication device is located; The second access and mobility management network element provides a service to the communication device according to the sixth information.

30. The method according to claim 29, characterized in that The method further comprises: The second access and mobility management network element updates the mobility restriction area list of the communication device in the second network according to the sixth information, and after the update, the mobility restriction area list of the communication device in the second network does not include the first area.

31. The method according to claim 29 or 30, characterized in that The first network element is a first access and mobility management network element or a unified data management network element, and the method further includes: The second access and mobility management network element acquires second configuration information, where the second configuration information is used to instruct the second access and mobility management network element to: if the communication device enters the mobility restriction area of ​​the second network, send the fifth information to the first network element; or, The second access and mobility management network element receives a second subscription message from the first network element, where the second subscription message is used to subscribe: if the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element; or, The second access and mobility management network element receives second policy update information from the second policy control network element, and updates the local policy of the second access and mobility management network element according to the second policy update indication information. After the update, the local policy of the second access and mobility management network element is: if the communication device enters the mobility restriction area of ​​the second network, the second access and mobility management network element sends the fifth information to the first network element, and the second network includes the second policy control network element.

32. A communication method, characterized in that: The method is applied in a scenario where a communication device accesses a first network and a second network, the first network includes a first access and mobility management network element, and the second network includes a second access and mobility management network element, and the method includes: The first access and mobility management network element determines whether the communication device enters a mobility restriction area of ​​the first network; In the case where the communication device enters the mobility restriction area of ​​the first network, the first access and mobility management network element sends third information to the second access and mobility management network element, wherein the third information is used to instruct the second network to stop providing services to the communication device; and the first access and mobility management network element stops providing services to the communication device; The second access and mobility management network element stops providing services to the communication device according to the third information.

33. A communication device, characterized in that: The method comprises a unit for executing any one of claims 1 to 6, or comprises a unit for executing any one of claims 7 to 21, or comprises a unit for executing any one of claims 22 to 31.

34. A communication device, characterized in that: include: A communication interface and a processor, wherein the processor is used to execute a computer program or instruction so that the communication device executes the method as described in any one of claims 1 to 6, or the communication device executes the method as described in any one of claims 7 to 21, or the communication device executes the method as described in any one of claims 22 to 31.

35. A computer-readable storage medium, characterized in that: The method comprises a computer program or an instruction, which, when executed on a computer, enables the computer to execute the method as claimed in any one of claims 1 to 6, or enables the computer to execute the method as claimed in any one of claims 7 to 21, or enables the computer to execute the method as claimed in any one of claims 22 to 31.

36. A computer program product, characterized in that Contains instructions, which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 6, or cause the computer to execute the method according to any one of claims 7 to 21, or cause the computer to execute the method according to any one of claims 22 to 31.

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