WO2023130857A1 - Communication system, method and apparatus, and storage medium - Google Patents

Abstract

The present invention relates to the field of communications. Disclosed are a communication system, method and apparatus, and a storage medium, for solving the problem in the prior art that when multiple operators share a network, the sharing operators cannot control and charge a terminal device. The method comprises: a terminal device accesses a first core network device by means of a first access network device, wherein the first access network device and the first core network device belong to a first PLMN network, the first core network device communicates with a second core network device by means of a communication interface, and the terminal device and the second core network device are core network devices in a second PLMN network; the terminal device sends home network information to the first core network device; and the terminal device sends service data to the first core network device. According to the present application, the service data of the terminal device is forwarded from the first access network device to a second access network device, thereby realizing the control and charging of the terminal device by the first access network device.

Description

Communication system, method, device and storage medium

This application claims the priority of the Chinese patent application with the application number 202210011138.6 and the application name "communication system, method, device and storage medium" submitted to the State Intellectual Property Office on January 05, 2022, the entire content of which is incorporated by reference in In this application.

technical field

The present invention relates to the communication field, in particular to a communication system, method, device and storage medium.

Background technique

In related technologies, when multiple operators share a network, usually only access network equipment is shared, and the shared access network equipment is respectively connected to core network equipment of each operator. The terminal device is connected to the core network device to which the terminal device belongs through the shared access network device.

In this network sharing method, the core network equipment of the operator who constructs the access network equipment cannot control and manage terminal equipment such as access control, policy control, network selection, and charging settlement.

Contents of the invention

The present invention provides a communication system, method, device and storage medium, which are used to solve the problem in the prior art that when multiple operators share a network, the sharing operator cannot control and charge terminal equipment.

To achieve the above object, the present invention adopts the following technical solutions:

In the first aspect, a communication system is provided, including: a terminal device, a first access network device, a first core network device, and a second core network device; the first access network device and the first core network device belong to the first A PLMN network; the terminal device and the second core network device belong to the second PLMN network; the first core network device and the second core network device communicate through the communication interface; wherein the terminal device is used to pass through the first access network The device accesses the first core network device, and sends home network information to the first core network device; the home network information is used to indicate that the home network of the terminal device is the second PLMN network; the first core network device is used to, according to the home network information, Determine the second access network device in the second PLMN network; the terminal device is also used to send service data to the first core network device; the first core network device is also used to send the service data to the second core network device after receiving the service data The device forwards service data.

In combination with the first aspect above, in a possible implementation manner, the first access network device is configured to send a first system message to the terminal device; the first system message includes at least one PLMN ID; the terminal device is configured to send the first system message to the terminal device; At least one PLMN ID is connected to the first access network device; the terminal device is also used to access the first core network device through the first access network device.

In combination with the first aspect above, in a possible implementation, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the ID of the second PLMN network broadcast by the second access network device PLMN ID; the second access network device is the access network device in the second PLMN network; or, at least one PLMN ID includes the second PLMN ID of the second PLMN network; the second PLMN ID and the second access network device The PLMN ID of the broadcasted second PLMN network is different; or, at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device.

In combination with the first aspect above, in a possible implementation manner, the system further includes: a second access network device; a second core network device, further configured to determine the first EPLMN list and send the list to the first access network device The first EPLMN list; the first EPLMN list includes one or more PLMN IDs in at least one PLMN ID; the first access network device is used to receive the first EPLMN list and send the first EPLMN list to the terminal device; terminal The device is configured to receive the first EPLMN list; the terminal device is also configured to parse the first system message and determine at least one PLMN ID in the first system message; one or more PLMN IDs in the at least one PLMN ID are related to the first If the PLMN IDs in the EPLMN list are the same, determine to access the first access network device.

In combination with the first aspect above, in a possible implementation manner, the first EPLMN list is an EPLMN list delivered by the second core network device to the terminal device when the terminal device meets the first preset condition; the first preset condition includes At least one of the following: the terminal device is located in the preset area; the terminal device is a terminal device that supports 5G SA; the terminal device is a terminal device that supports preset frequencies; the terminal device is a terminal device that supports and opens the VONR voice service; Internet of Things terminal device; the SUPI number range of the terminal device is the first preset SUPI number range; the terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.

With reference to the first aspect above, in a possible implementation manner, the second access network device is further configured to determine the first priority indication information, and send the first priority indication information to the terminal device; the first priority indication The information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device; the third access network device is the preset network in the second PLMN network standard access network equipment.

The terminal device is further configured to receive the first priority indication information, and access the first access network device when the area of the first access network device includes the first access network device and the third access network device.

With reference to the first aspect above, in a possible implementation manner, the first core network device is further configured to determine a second EPLMN list, and send the second EPLMN list to the first access network device; the second EPLMN list includes The PLMN ID of the second PLMN network; the first access network device is also used to receive the second EPLMN list, and forward the second EPLMN list to the terminal device; the terminal device is used to receive the second EPLMN list, and according to the second EPLMN list Perform cell selection or cell reselection.

In combination with the first aspect above, in a possible implementation manner, the second EPLMN list is an EPLMN list delivered by the first core network device to the terminal device when the terminal device meets the second preset condition; the second preset condition includes At least one of the following: the SUPI number segment of the terminal device is the second preset SUPI number segment; the HPLMN of the terminal device is the PLMN of the second PLMN network; the terminal device is located in the preset TAC.

With reference to the first aspect above, in a possible implementation manner, the first access network device is further configured to determine the second priority indication information, and send the second priority indication information to the terminal device; the second priority indication The information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device in the second PLMN network; the terminal device is used to receive the second priority indicating information, and when the coverage area of the first access network device includes the first access network device and the third access network device, access the first access network device.

In combination with the first aspect above, in a possible implementation manner, the terminal device is specifically configured to: parse the first system message to determine at least one PLMN ID; if the first PLMN ID exists in the terminal device, according to the first PLMN ID ID access to the first access network device; the first PLMN ID is the same PLMN ID as one of the PLMN IDs in at least one of the first system messages; if the first PLMN ID does not exist in the terminal device, search for the first PLMN ID The signal of the second PLMN network, after searching for the signal of the second PLMN network, accesses the access network device of the second PLMN network; receives the first EPLMN list from the access network device of the second PLMN network; according to the first EPLMN List, determine the first PLMN ID, and access the first access network device according to the first PLMN ID; if the terminal device does not search for the signal of the second PLMN network, select a PLMN ID from at least one PLMN ID, and according to The PLMI ID initiates access to the first access network device; if the access is successful, a PLMN ID is used as the first PLMN ID; if the access fails, another PLMN ID is selected to initiate the first access network device Access, until the access is successful, the PLMN ID when the access is successful is used as the first PLMN ID; after the first PLMN ID is determined, the first PLMN ID is sent to the first access network device.

With reference to the first aspect above, in a possible implementation manner, the first access network device is further configured to receive the first PLMN ID, and forward the first PLMN ID to the first core network device.

In combination with the first aspect above, in a possible implementation manner, the first core network device is further configured to: receive the first PLMN ID, and determine the second core network device according to the first PLMN ID.

In combination with the first aspect above, in a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

In combination with the first aspect above, in a possible implementation manner, the first core network device is also used to perform access control on the terminal device; the access control includes at least one of the following items: the SUPI number segment of the terminal device is the first In the case of a preset SUPI number segment, the terminal device is allowed to access; when the SUPI number segment of the terminal device is the second preset number segment, the terminal device is denied access; when the SUPI number segment of the terminal device is the third In the case of the preset number segment, and the capabilities of the terminal device do not include the preset capabilities, the terminal device is denied access; the first PLM N ID determined by the terminal device is the preset PLMN ID, and the SUPI of the terminal device is the preset SUPI Under the circumstances, the terminal equipment is allowed to access.

In combination with the first aspect above, in a possible implementation manner, the first core network device is further configured to perform policy control on the terminal device; the policy control includes at least one of the following: rejecting the first type of slice access of the terminal device; The first type of slice is the slice requested by the terminal device, or the preset type of slice delivered by the second core network device to the first core network device; the first type of slice is mapped to the second type of slice, allowing the second type of slice Access; rejecting the first type of QoS access of the terminal device; the first type of QoS is the QoS requested by the terminal device, or the preset type of QoS issued by the second core network device to the terminal device; the first type of QoS The QoS is mapped to the second type of QoS, and the second type of QoS access is allowed.

With reference to the first aspect above, in a possible implementation manner, the first core network device is further configured to charge the terminal device according to the data traffic of the service data when forwarding the service data to the second core network device.

In the second aspect, a communication method is provided, which is applied to a communication system. The communication system includes: a terminal device, a first access network device, a first core network device, and a second core network device. The method includes: the terminal device passes through the first The access network device is connected to the first core network device; the first access network device and the first core network device belong to the first PLMN network; the terminal device belongs to the second PLMN network; the first core network device and the second core network The devices communicate through the communication interface; the second core network device is the core network device in the second PLMN network; the terminal device sends home network information to the first core network device; the home network information is used to indicate that the home network of the terminal device is the first Two PLMN networks, so that the first core network device determines the second access network device in the second PLMN network according to the home network information; the terminal device sends service data to the first core network device, so that the first core network device receives After receiving the service data, forward the service data to the second core network device.

With reference to the second aspect above, in a possible implementation manner, the terminal device accessing the first core network device includes: the terminal device receiving the first system message from the first access network device; the first access network device being The access network device in the first PLMN network; the first system message includes at least one PLMN ID; the terminal device accesses the first access network device according to at least one PLMN ID; the terminal device accesses the first access network device through the first access network device A core network device.

In combination with the second aspect above, in a possible implementation, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the PLMN of the second PLMN network broadcast by the second access network device ID; or, at least one PLMN ID includes the second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device; or, at least one of the PLMN IDs A third PLMN ID is included; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device.

In combination with the second aspect above, in a possible implementation manner, the terminal device accessing the first access network device according to at least one PLMN ID includes: the terminal device receiving the first EPLMN list from the second access network device; An EPLMN list includes one or more PLMN IDs in at least one PLMN ID; when one or more PLMN IDs in at least one PLMN ID are the same as the PLMN ID in the first EPLMN list, the terminal device determines to access The first access network device.

In combination with the second aspect above, in a possible implementation manner, the first EPLMN list is an EPLMN list delivered by the second core network device to the terminal device when the terminal device meets the first preset condition; the first preset condition includes At least one of the following: the terminal device is located in the preset area; the terminal device is a terminal device that supports 5G SA; the terminal device is a terminal device that supports preset frequencies; the terminal device is a terminal device that supports and opens the VONR voice service; Internet of Things terminal device; the SUPI number range of the terminal device is the first preset SUPI number range; the terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.

With reference to the second aspect above, in a possible implementation manner, the terminal device accessing the first access network device according to at least one PLMN ID further includes: the terminal device receiving the first priority indication from the second access network device information; the first priority indication information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device; the third access network device is the first 2. Access network equipment with a preset network standard in the PLMN network; when the first access network equipment and the third access network equipment are included in the area of the first access network equipment, the terminal equipment accesses the first access network equipment.

In combination with the second aspect above, in a possible implementation manner, after the terminal device accesses the first access network device according to at least one PLMN ID, the method further includes: the terminal device receives the second EPLMN from the first access network device list; the second EPLMN list includes the PLMN ID of the second PLMN network; the terminal device performs cell selection or cell reselection according to the second EPLMN list.

In combination with the second aspect above, in a possible implementation, the second EPLMN list is the EPLMN list issued by the first core network device to the terminal device when the terminal device meets the second preset condition; the second preset condition includes At least one of the following: the SUPI number segment of the terminal device is the second preset SUPI number segment; the HPLMN of the terminal device is the PLMN of the second PLMN network; the terminal device is located in the preset TAC.

With reference to the second aspect above, in a possible implementation manner, the method further includes: the terminal device receives second priority indication information from the first access network device; the second priority indication information is used to indicate: the terminal device receives The priority of accessing the first access network device is higher than the priority of the terminal device accessing the third access network device in the second PLMN network; the first access network device is included in the coverage area of the first access network device and the third access network device, the terminal device accesses the first access network device.

In combination with the second aspect above, in a possible implementation manner, the terminal device accesses the first access network device according to at least one PLMN ID, including: the terminal device parses the first system message to determine at least one PLMN ID; In the case where the first PLMN ID exists in the first PLMN ID, the terminal device accesses the first access network device according to the first PLMN ID; the first PLMN ID is the same PLMN ID as a PLMN ID in at least one of the first system messages; In the case that the first PLMN ID does not exist in the terminal device, the terminal device searches for the signal of the second PLMN network, and after searching for the signal of the second PLMN network, accesses the access network device of the second PLMN network; the terminal device receives The first EPLMN list of the access network device from the second PLMN network.

Determine the first PLMN ID according to the first EPLMN list, and access the first access network device according to the first PLMN ID; if the terminal device does not search for the signal of the second PLMN network, the terminal device selects from at least one PLMN ID A PLMN ID, and initiate access to the first access network device according to the PLMI ID; if the access is successful, use a PLMN ID as the first PLMN ID; if the access fails, select another PLMN ID to connect to the first PLMN An access network device initiates access until the access is successful, and uses the PLMN ID when the access is successful as the first PLMN ID; after determining the first PLMN ID, the terminal device sends the first PLMN ID to the first access network device .

In combination with the second aspect above, in a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

In a third aspect, a communication method is provided, which is applied to a communication system. The communication system includes: a terminal device, a first access network device, a first core network device, and a second core network device. The method includes: the first core network device Receive home network information from the terminal device; wherein, the terminal device accesses the first core network device through the first access network device; the first access network device and the first core network device belong to the first PLMN network; the terminal device belongs to In the second PLMN network; the first core network device and the second core network device communicate through the communication interface; the second core network device is the core network device in the second PLMN network; the home network information is used to indicate the ownership of the terminal device The network is the second PLMN network; the first core network device determines the second access network device in the second PLMN network according to the home network information; the first core network device receives service data from the terminal device; the first core network device sends The second core network device forwards the service data.

In combination with the third aspect above, in a possible implementation, the method further includes: the first core network device determines the second EPLMN list; the second EPLMN list includes the PLMN ID of the second PLMN network; the first core network device sends The first access network device sends the second EPLMN list.

In combination with the third aspect above, in a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

In combination with the above third aspect, in a possible implementation manner, the method further includes: the first core network device performs access control on the terminal device; the access control includes at least one of the following: the SUPI number segment of the terminal device is the first In the case of a preset SUPI number segment, the terminal device is allowed to access; when the SUPI number segment of the terminal device is the second preset number segment, the terminal device is denied access; when the SUPI number segment of the terminal device is the third In the case of the preset number range, and the capabilities of the terminal equipment do not include the preset capabilities, the terminal equipment access is rejected; the first PLMN ID determined by the terminal equipment is the preset PLMN ID, and the SUPI of the terminal equipment is the default SUPI In some cases, the terminal equipment is allowed to access.

In combination with the third aspect above, in a possible implementation manner, the method further includes: the first core network device performs policy control on the terminal device; the policy control includes at least one of the following: rejecting the first type of slice access of the terminal device; The first type of slice is the slice requested by the terminal device, or the preset type of slice delivered by the second core network device to the first core network device; the first type of slice is mapped to the second type of slice, allowing the second type of slice Access; rejecting the first type of QoS access of the terminal device; the first type of QoS is the QoS requested by the terminal device, or the preset type of QoS issued by the second core network device to the terminal device; the first type of QoS The QoS is mapped to the second type of QoS, and the second type of QoS access is allowed.

With reference to the above third aspect, in a possible implementation manner, the method further includes: when the first core network device forwards the service data to the second core network device, charging the terminal device according to the data traffic of the service data.

In a fourth aspect, a communication device is provided, including: a communication unit and a processing unit; the processing unit is configured to instruct the communication unit to access the first core network device through the first access network device; the first access network device and the first The core network device belongs to the first PLMN network; the terminal device belongs to the second PLMN network; the first core network device and the second core network device communicate through the communication interface; the second core network device is the core of the second PLMN network network equipment; a processing unit, used to instruct the communication unit to send home network information to the first core network device; the home network information is used to indicate that the home network of the terminal device is the second PLMN network; the processing unit is used to instruct the communication unit to send home network information to the first core network device; The core network device sends service data.

With reference to the fourth aspect above, in a possible implementation manner, the processing unit is specifically configured to: instruct the communication unit to receive the first system message from the first access network device; the first access network device is the first PLMN network The access network device in the first system message includes at least one PLMN ID to access the first access network device according to the at least one PLMN ID; access the first core network device through the first access network device.

In combination with the fourth aspect above, in a possible implementation, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the PLMN of the second PLMN network broadcast by the second access network device ID; or, at least one PLMN ID includes the second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device; or, at least one of the PLMN IDs A third PLMN ID is included; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device.

In combination with the fourth aspect above, in a possible implementation manner, the processing unit is specifically configured to: instruct the communication unit to receive the first EPLMN list from the second access network device; the first EPLMN list includes at least one PLMN ID One or more PLMN IDs; in the case that one or more PLMN IDs in at least one PLMN ID are the same as the PLMN ID in the first EPLMN list, determine to access the first access network device.

In combination with the fourth aspect above, in a possible implementation manner, the first EPLMN list is an EPLMN list delivered by the second core network device to the terminal device when the terminal device meets the first preset condition; the first preset condition includes At least one of the following: the terminal device is located in the preset area; the terminal device is a terminal device that supports 5G SA; the terminal device is a terminal device that supports preset frequencies; the terminal device is a terminal device that supports and opens the VONR voice service; Internet of Things terminal device; the SUPI number range of the terminal device is the first preset SUPI number range; the terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.

With reference to the fourth aspect above, in a possible implementation manner, the processing unit is specifically configured to: instruct the communication unit to receive the first priority indication information from the second access network device; the first priority indication information is used to indicate : The priority of terminal equipment accessing the first access network equipment is higher than the priority of terminal equipment accessing the third access network equipment; the third access network equipment is the access of the preset network standard in the second PLMN network network equipment; when the area of the first access network equipment includes the first access network equipment and the third access network equipment, instruct the communication unit to access the first access network equipment.

With reference to the fourth aspect above, in a possible implementation manner, the processing unit is further configured to: instruct the communication unit to receive the second EPLMN list from the first access network device; the second EPLMN list includes the information of the second PLMN network. PLMN ID; perform cell selection or cell reselection according to the second EPLMN list.

In combination with the fourth aspect above, in a possible implementation, the second EPLMN list is the EPLMN list delivered by the first core network device to the terminal device when the terminal device meets the second preset condition; the second preset condition includes At least one of the following: the SUPI number segment of the terminal device is the second preset SUPI number segment; the HPLMN of the terminal device is the PLMN of the second PLMN network; the terminal device is located in the preset TAC.

With reference to the above fourth aspect, in a possible implementation manner, the processing unit is further configured to: instruct the communication unit to receive second priority indication information from the first access network device; the second priority indication information is used to indicate: The priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device in the second PLMN network; the coverage area of the first access network device includes the first access network device When connecting the network access device and the third access network device, instruct the communication unit to access the first access network device.

In combination with the fourth aspect above, in a possible implementation manner, the processing unit is specifically configured to: the terminal device parses the first system message to determine at least one PLMN ID; when the first PLMN ID exists in the terminal device, indicate The communication unit accesses the first access network device according to the first PLMN ID; the first PLMN ID is the same PLMN ID as one of the PLMN IDs in at least one of the first system messages; there is no first PLMN ID in the terminal device In the case of , search for the signal of the second PLMN network, after searching for the signal of the second PLMN network, access the access network device of the second PLMN network; instruct the communication unit to receive the signal from the access network device of the second PLMN network The first EPLMN list; according to the first EPLMN list, determine the first PLMN ID, and access the first access network device according to the first PLMN ID; if the terminal device does not search for the signal of the second PLMN network, then from at least one PLMN Select a PLMN ID in the ID, and initiate access to the first access network device according to the PLMI ID; if the access is successful, use a PLMN ID as the first PLMN ID; if the access fails, select another PLMN The ID initiates access to the first access network device until the access is successful, and the PLMN ID when the access is successful is used as the first PLMN ID; after determining the first PLMN ID, instruct the communication unit to send the first PLMN ID to the first access network device First PLMN ID.

In combination with the fourth aspect above, in a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

In a fifth aspect, a communication device is provided, including: a communication unit and a processing unit; the processing unit is configured to instruct the communication unit to receive home network information from a terminal device; wherein, the terminal device accesses the first Core network equipment; the first access network equipment and the first core network equipment belong to the first PLMN network; the terminal equipment belongs to the second PLMN network; the first core network equipment and the second core network equipment communicate through the communication interface; The second core network device is the core network device in the second PLMN network; the home network information is used to indicate that the home network of the terminal device is the second PLMN network; the processing unit is also used to determine the second PLMN network according to the home network information The second access network device; the processing unit is further configured to instruct the communication unit to receive service data from the terminal device; the processing unit is further configured to instruct the communication unit to forward the service data to the second core network device.

In combination with the fifth aspect above, in a possible implementation manner, the processing unit is specifically configured to: determine the second EPLMN list; include the PLMN ID of the second PLMN network in the second EPLMN list; instruct the communication unit to access the first The network device sends the second EPLMN list.

In combination with the fifth aspect above, in a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

With reference to the fifth aspect above, in a possible implementation manner, the processing unit is further configured to perform access control on the terminal device; the access control includes at least one of the following items: the SUPI number range of the terminal device is the first preset In the case of the SUPI number range, the terminal device is allowed to access; when the SUPI number range of the terminal device is the second preset number range, the terminal device is denied access; when the SUPI number range of the terminal device is the third preset number If the capability of the terminal device does not include the preset capability, the access of the terminal device is denied; when the first PLMN ID determined by the terminal device is the preset PLMN ID, and the SUPI of the terminal device is the preset SUPI, it is allowed Terminal equipment access.

In combination with the fifth aspect above, in a possible implementation manner, the processing unit is further configured to perform policy control on the terminal device; the policy control includes at least one of the following: rejecting the first type slice access of the terminal device; The slice is the slice requested by the terminal device, or the slice of the preset type issued by the second core network device to the first core network device; the first type of slice is mapped to the second type of slice, and the access of the second type of slice is allowed; Rejecting the first type of QoS access of the terminal device; the first type of QoS is the QoS requested by the terminal device, or the preset type of QoS issued by the second core network device to the terminal device; mapping the first type of QoS to The second type of QoS allows the second type of QoS access.

With reference to the fifth aspect above, in a possible implementation manner, the processing unit is further configured to charge the terminal device according to the data traffic of the service data when forwarding the service data to the second core network device.

In a sixth aspect, the present application provides a communication device, the communication device includes: a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the first aspect and the first aspect The communication method described in any possible implementation manner of .

In a seventh aspect, the present application provides a communication device, the communication device includes: a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the second aspect and the second aspect The communication method described in any possible implementation manner of .

In an eighth aspect, the present application provides a computer-readable storage medium, in which instructions are stored, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can perform such The first aspect and the communication method described in any possible implementation manner of the first aspect.

In a ninth aspect, the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by a processor of a communication device, the communication device can perform such The communication method described in the second aspect and any possible implementation manner of the second aspect.

In this application, the names of the above-mentioned communication devices do not limit the devices or functional modules themselves, and in actual implementation, these devices or functional modules may appear with other names. As long as the functions of each device or functional module are similar to those of the present invention, they fall within the scope of the claims of the present invention and their equivalent technologies.

These and other aspects of the invention will be more clearly understood in the following description.

The technical solution provided by this application brings at least the following beneficial effects: In the communication system provided by the embodiment of this application, a communication interface is opened between the first core network device and the second core network device, and through this communication interface, the first core The network device may route the service data of the terminal device on the same PLMN network as the second core network device to the second core network device, and the second core network device processes the service data of the terminal device.

When the terminal device roams to the area covered by the first access network device, it can access the first access network device, and access to the first core network device through the first access network device. The terminal device sends the home network information of the terminal device to the first core network device, and the first core network device routes the terminal device to a core network device (second core network device) of the home network according to the home network information of the terminal device.

In this way, when the terminal device provides network services through the shared network, the core network device of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal device. Solved the problem that the current shared network cannot control the terminal equipment of other operators.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a system architecture diagram of a kind of MOCN system provided by the present application;

FIG. 2 is a system architecture diagram of a communication system provided by the present application;

FIG. 3 is a system architecture diagram of another communication system provided by the present application;

FIG. 4 is a schematic flowchart of a communication method provided by the present application;

FIG. 5 is a schematic flowchart of another communication method provided by the present application;

FIG. 6 is a schematic flowchart of another communication method provided by the present application;

FIG. 7 is a schematic structural diagram of a communication device provided by the present application;

FIG. 8 is a schematic structural diagram of another communication device provided by the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

Below, at first the term that this application involves is explained:

1. Shared network system of multi-operator core network (MOCN).

At present, with the development of the fifth generation mobile communication technology (5G) network, the network coverage is more dense, the number of base stations is also increasing, and the network construction cost of operators is also increasing. In order to reduce the cost of network construction, a network sharing method is currently proposed. In this method, multiple operators share the same network, thereby reducing the redundant construction of communication networks, saving the overall investment of the network, and alleviating the huge cost of network construction. .

The shared network architecture supporting 5G MOCN is specified in the 3GPP R16 protocol specification. In this network architecture, terminal devices are supported to share 5G access networks (RAN) of different operators. The network architecture of MOCN is shown in Figure 1.

As shown in Figure 1, in MOCN system 10, comprise the core network equipment 101 of operator A, the core network equipment 102 of operator B, the core network equipment 103 of operator C, the core network equipment 104 of operator X (denoted as The first core network device), and the access network device 105 of operator X (referred to as the first access network device).

Among them, the access network equipment 105 of operator X is connected to the core network equipment 101 of operator A, the core network equipment 102 of operator B, and the core network equipment 103 of operator C through interfaces N2 and N3 respectively.

The access network device 105 of operator X is used to access the terminal equipment of operator A, operator B and operator C, and forward the data of the terminal equipment to the corresponding operator's core network equipment.

In the MOCN system 10, only operator X builds an access network network, and the terminal equipment of other operators is within the coverage of operator X's access network equipment 105, and can be accessed by accessing operator X's access network equipment 105 Connect to the corresponding core network equipment to complete the communication service for the terminal equipment.

2. In the current MOCN shared network system, the access network equipment broadcasts the public land mobile network (public land mobile network, PLMN) identification (Identity, ID).

In the current MOCN system, the first access network device will carry the PLMN ID of the core network of each operator sharing the access network device in the broadcast system message.

For example, in the case that operator A and operator X use MOCN to share the access network, the first access network device carries the PLMN IDs of operator A and operator X respectively in the broadcast system information. Each PLMN ID corresponds to an operator's core network.

After receiving the broadcast system message, the terminal device parses the system message and determines the PLMN ID carried in the system message. The terminal device determines the core network to which the first access network device is connected according to the PLMN ID, and selects the PLMN ID of the network to which the terminal device belongs. The terminal device notifies the first access network device of the selected PLMN ID. After receiving the PLMN ID selected by the terminal device, the first access network device routes the service data of the terminal device to the core network selected by the terminal device according to the PLMN ID selected by the terminal device.

An example, with reference to Figure 1, in the case where operator X, operator A, operator B, and operator C share the access network of operator X, operator X, operator A, operator B, operator C, the PLMN selection (or reselection) process of the terminal equipment is shown in Table 1 below:

Table 1. In the MOCN sharing mode, share the PLMN ID carried in the system message broadcast by the first access network device and the PLMN selection and message routing of each operator's terminal device:

It should be pointed out that in practical applications, the first access network device of operator X carries the core network identifier PLMN-ID(A) of operator A and the core network identifier PLMN of operator B in the broadcast system message. -ID (B), the core network identifier PLMN-ID(C) of operator C, and the core network identifier PLMN-ID(X) of operator X at the same time. Since the first access network device of the operator X carries the PLMN-ID(X) in the broadcasted system message, it belongs to the conventional broadcasting method, not the broadcasting method of the shared network. Therefore, FIG. 1 and Table 1 do not show the situation that the terminal equipment of operator X performs network sharing.

In one example, when operator A and operator X use MOCN to share the network, the access network built by operator A carries the PLMN ID of operator B in the broadcast system message, so that the terminal of operator B The device is connected to the access network of operator A; at the same time, the system message will also carry the PLMN ID of operator A so that the terminal equipment of operator A can also access the access network of operator A.

Similarly, the access network built by operator X carries the PLMN ID of operator A in the broadcast system message, so that the terminal equipment of operator A can access the access network of operator X; at the same time, the system message will also include Carry the PLMN ID of operator X so that the terminal equipment of operator X can also access the access network of operator X.

In the MOCN sharing mode, the terminal device needs to select the core network according to the PLMN ID broadcast by the first access network device. Therefore, the number of PLMN IDs broadcast by the first access network device needs to be the same as the number of 5G core networks sharing the access network. Therefore, the first access network device must broadcast multiple PLMN IDs so that all terminal devices can access the access network.

In a case where N operators share access, the maximum number of shared operators carried in the system message broadcast by the first access network device of the shared access network is N-1. N is a positive integer.

In addition, in the MOCN sharing mode, the PLMN ID broadcast by the shared access network is the same as the PLMN ID of each shared operator. In this way, the terminal device has the shortest time delay when selecting a PLMN (the specific time delay is determined according to the selection sequence of the PLMN ID of the terminal device) and the time for the terminal device to select a network to reside is the shortest. Especially when the terminal equipment is turned on, or the terminal equipment selects the cell after the terminal equipment recovers from a cell without coverage, and the terminal equipment in the idle state performs cell reselection, the time delay required for selecting the PLMN and network selection and staying in this method is the shortest .

The use of MOCN shared access network has at least the following advantages: under the framework of MOCN shared access network, the core networks of different operators are completely independently set up, and it has better support for 5G special services such as network slicing and edge computing.

The nouns involved in the embodiments of the present application have been explained above.

However, in the networking mode of the shared access network of MOCN, since the terminal device is directly connected to the core network device of the operator that the terminal device belongs to through the first access network device, the terminal device does not report to the core network of operator X. (For example, 5G core network (5G core network, 5GC) is registered, and the service data of terminal equipment is not forwarded through the core network equipment of operator X. Therefore, in the current networking mode of MOCN shared access network, operator X The core network (such as 5GC) cannot perform access control, policy control, network selection, billing settlement, etc. control and management on other operators’ access networks and access users. This will further cause the contractor (construction) of the shared network to Inter-network settlement cannot be carried out between the operators of the shared network, such as the above-mentioned operator X) and the sharing parties (operators sharing the network built by the contractor, such as the above-mentioned operator A, operator B, and operator C). The party's willingness to build a shared network is relatively weak, and it is difficult to promote the current MOCN shared network method.

In order to solve the above technical problems, the present application provides a communication system, which enables multiple operators to share the core network while sharing the access network. The terminal equipment is connected to the contractor's core network through the contractor's access network. When the terminal equipment needs to transmit services, the contractor's core network equipment will transmit the service data of the terminal equipment to the core network of the operator of the terminal equipment. In the network, the core network equipment belonging to the operator processes the service data of the terminal equipment.

Based on this, in this application, since the service data of the terminal equipment is forwarded by the core network equipment of the contractor to the core network equipment of the home network, the core network equipment of the contractor can realize the connection to the terminal equipment through the network elements in the core network. Access control, policy control, network selection, billing and settlement.

Fig. 2 is a communication system 20 provided by the embodiment of the present application. As shown in Fig. 2, the communication system provided by the embodiment of the present application includes: a first access network device 201, a first core network device 202, at least one second core network The device 203 and the terminal device 204.

Wherein, the first access network device 201 is configured to implement a function of a wireless access network, and provide wireless access services for terminal devices. The first access network device 201 is the access network device of the contractor operator. For example, the access network equipment of operator X.

The first core network device 202 is the core network device of the contractor operator. For example, core network equipment of operator X.

For the terminal equipment of the contractor operator, the first core network equipment 202 is used to implement functions related to the core network and provide business services related to the core network.

The first core network device 202 for the terminal device of the shared operator is used to provide a data routing function, and route the service data of the terminal device to the home core network of the terminal device. At this time, the first core network device 202 may also perform access control, policy control, network selection, and charging settlement on the terminal device.

The second core network device 203 is the core network device of the sharing party operator, and is used for the terminal equipment of the sharing party operator to implement functions related to the core network. For example, to provide data processing or forwarding functions.

In FIG. 2 , it is illustrated by taking one less second core network device 203 including a core network device 2031 of operator A, a core network device 2032 of operator B, and a core network device 2033 of operator C.

Among them, the core network equipment 2031 of operator A is used to provide core network-related business services for terminal equipment of operator A; the core network equipment 2032 of operator B is used to provide core network-related services for terminal equipment of operator B Service: The core network equipment 2033 of operator C is used to provide core network-related business services for terminal equipment of operator C.

The terminal device 204 is a device that needs to provide communication services, and may be a terminal device that belongs to the same operator as the first access network device 201 and the first core network device 202 . The terminal device 204 may also be a terminal device that belongs to the same operator as any second core network device 203 in the at least one second core network device 203 . In this application, description is mainly made by taking the terminal device as an example that belongs to the same operator as any one of the second core network devices 203 in the at least one second core network device 203 .

In the above, each device in the communication system 20 shown in FIG. 2 has been briefly described.

It should be pointed out that in the communication system shown in Figure 2, the terminal equipment, the access network equipment and the core network equipment all need to perform corresponding action processes and realize corresponding functions, so as to realize the connection between the contractor's core network equipment and the terminal equipment. Functions of access control, policy control, network selection, billing and settlement.

Specifically, it includes: Scenario 1, the process in which the first access network device broadcasts the PLMN ID; Scenario 2, the process in which the terminal device selects the PLMN ID; Scenario 3, the second access network device and the second core network device to the terminal device The process of issuing PLMN ID auxiliary parameters; Scenario 4, the process of the first access network device and the second access network device issuing network selection auxiliary parameters for the terminal device; Scenario 5, the second core network device receiving the terminal device The process of access control, policy control, network selection, charging and settlement.

In the following, they are explained separately:

Scenario 1. The process in which the first access network device broadcasts the PLMN ID.

In order to be able to notify the terminal device of the PLMN network supported by the first terminal device, the first access network device needs to broadcast the PLMN ID to the terminal device, and the first access network device can adopt the following schemes 1 to 3 when broadcasting the PLMN ID Any one of the schemes broadcasts the PLMN ID. The following describes scheme 1, scheme 2, and scheme 3 respectively:

Solution 1. The first access network device broadcasts the original PLMN ID of the core network for each core network connected to the first access network device. The PLMN ID of each core network is the same as the PLMN ID broadcast for the core network in the network of the operator to which it belongs. That is to say, in solution 1, the first access network device broadcasts the PLMN ID of each core network in the same way as the MOCN broadcasts the PLMN ID in the related art.

An example, in conjunction with Figure 2, when the first access network device of operator X broadcasts the PLMN ID, it broadcasts the PLMN ID (A) for the core network of operator A, and broadcasts the PLMN ID (B) for the core network of operator B respectively. ), and the core network of operator C broadcasts the PLMN ID (C).

The use of scheme 1 to broadcast the PLMN ID brings at least the following beneficial effects: when the terminal device obtains the PLMN ID, the time delay required for selecting the PLMN (for example, when the terminal device is powered on or recovers from a non-coverage area) is the shortest. In addition, in scheme 1, the first access network device broadcasts the PLMN ID of each core network in the same way as MOCN broadcasts the PLMN ID in the related technology, without creating a new network number, and will not cause waste of network number resources.

In solution 1, the maximum number of PLMN IDs of the core network of the shared operator that the first access network device can broadcast is N-1. N is the maximum number of broadcast PLMN IDs that the first access network device can support, and N is a positive integer.

Solution 2: The first access network device broadcasts a new PLMN ID for each core network connected to the first access network device. The new PLMN ID of each core network is different from the PLMN ID broadcast for the core network in the own network of the operator to which it belongs. For example, the first access network device may combine the PLMN ID of the contractor operator and the PLMN ID of the shared operator to obtain the PLMN ID of each core network.

An example, in conjunction with Figure 2, when the first access network device of operator X broadcasts the PLMN ID, it broadcasts the PLMN ID (XA) for the core network of operator A, and broadcasts the PLMN ID (XB) for the core network of operator B respectively. ), and the core network of operator C broadcasts the PLMN ID (XC).

Adopting scheme 2 to broadcast the PLMN ID brings at least the following beneficial effects: the first access network device can customize and broadcast a new PLMN ID. In this way, after the terminal device receives the new PLMN ID, it can determine according to the new PLMN ID that the access network is an access network undertaken by operator X that can be shared. In addition, the terminal device can also display the network identification of the contractor operator and the network identification of the sharing operator on the display interface at the same time according to the new PLMN ID.

In solution 2, the maximum number of PLMN IDs of the core network of the shared operator that the first access network device can broadcast is N-1.

Solution 3: The first access network device broadcasts a same PLMN ID for each core network connected to the first access network device.

An example, referring to FIG. 2, the first access network device only broadcasts the PLMN ID of the core network of operator X. Alternatively, the first access network device only broadcasts the new PLMN ID (XY) of the core network of operator X.

Adopting scheme 3 to broadcast the PLMN ID brings at least the following beneficial effects: the first access network device only needs to broadcast one PLMN ID, which reduces the signaling overhead of the first access network device. When the first access network device only broadcasts the PLMN ID of the core network of operator X, there will be no waste of network number resources. In solution 3, since the first access network device does not broadcast the PLMN ID of each operator, in solution 3, it is necessary to add that the first core network device can determine the ownership of the terminal device without the PLMN ID selected by the terminal device The function of the network. For example, the function of identifying the SUPI or HPLMN of the terminal device by the first core network device is extended. Correspondingly, the terminal device also needs to have the function of reporting SUPI or HPLMN.

An example, in combination with the above scheme 1, scheme 2, scheme 3 and Figure 2, the manner of the PLMN ID broadcast by the first access network device of operator X is shown in Table 2 below:

Table 2. The way in which the first access network device of operator X broadcasts the PLMN ID

In a possible implementation manner, the first access network device broadcasts the PLMN ID by broadcasting the first system message, and the first system message carries the PLMN ID that the terminal device needs to broadcast.

Scenario 2. The terminal device selects a PLMN ID.

When a terminal device accesses the first access network device, it needs to determine whether there is a terminal device in the PLMN ID broadcast by the first access network device according to the PLMN network it supports and the PLMN ID broadcast by the first access network device Supported PLMN IDs.

Specifically, after the terminal device moves into the coverage area of the first access network device, the terminal device receives the PLMN ID broadcast by the first access network device. The terminal device performs PLMN selection according to the PLMN ID of the home network, and selects the PLMN ID corresponding to the home network of the terminal device from the first system message (when broadcasting in scheme 3, the terminal device can directly select the broadcast PLMN ID). The terminal device sends the PLMN ID selected by the terminal device to the first access network device. The first access network device forwards the PLMN ID selected by the terminal device to the first core network device. The first core network device determines the core network to which the terminal device belongs according to the PLMN ID selected by the terminal device. The first core network device routes the terminal device to the core network to which the terminal device belongs. The first core network device forwards the service data of the terminal device to the core network device to which the terminal device belongs; or the first core network device forwards to the terminal device the service content subscribed by the terminal device to the core network device to which the terminal device belongs.

After receiving the registration request of the terminal device, or forwarding the core network service subscribed by the terminal device, the first core network device performs access control, policy control, network selection, and charging settlement for the terminal device.

An example, combined with Table 2, as shown in Table 3 below, taking the terminal device of operator A to select the PLMN ID as an example, to illustrate the selection of the PLMN ID for the terminal device:

Table 3. Terminal equipment of operator A selects PLMN ID

According to the PLMN selection process of operator A’s terminal equipment corresponding to scheme 2 and scheme 3 in Table 3, it can be seen that in the above scheme 2 and scheme 3, due to the PLMN ID broadcast by the terminal equipment (for example, PLMN-ID(XA), PLMN -ID(XY)) has a lower search priority than RPLMN, HPLMN, and EHPLMN in the terminal device. Therefore, in the process of searching the network and selecting a PLMN, the terminal device chooses to camp in the first access network device when there is no home network signal coverage in the coverage area of the first access network device.

If operator A in the coverage area of the first access network does not have 5G signal coverage in the area, but has 4th generation mobile communication technology (4th generation mobile communication technology, 4G) signal coverage, then the terminal equipment of operator A is When selecting a network, because the PLMN ID broadcast by operator A includes the HPLMN of the terminal device, but the PLMN ID broadcast by the first access network device does not include the HPLMN of the terminal device. This will cause the terminal device to preferentially choose to camp on the 4G cell of operator A. In turn, the terminal equipment will not be able to reside in the shared 5G cell provided by operator X, and the 5G network sharing between operator A and operator X cannot be realized.

In order for the terminal device to access the first access network device within the coverage area of the first access network device, the second core network device and the second access network device are required to issue PLMN ID auxiliary parameter selection for the terminal device. The following is a detailed introduction in combination with scenario 3:

Scenario 3: A process in which the second access network device and the second core network device issue PLMN ID auxiliary parameters to the terminal device.

The terminal device initiates registration with the second access network device in the network of the home operator, and registers with the second access network device. The second access network device and the second core network device issue PLMN ID auxiliary parameters to the terminal device.

The PLMN ID auxiliary parameters include: at least one of the first equivalent PLMN (Equivalent Public Land Mobile Network, EPLMN) list and the first priority indication information.

The first EPLMN list includes one or more of at least one PLMN ID broadcast by the first access network device. An example is for a terminal device of operator A, the first EPLMN list includes the new PLMN ID of operator A (corresponding to scheme 2), or, the first EPLMN list includes the PLMN ID of operator X (corresponding to scheme 2). 3).

The first priority indication information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device. The third access network device is an access network device of a preset network standard in the second PLMN network. In one example, the preset network standard is the 4G network standard.

Specifically, the second core network device may issue the first EPLMN list to the terminal device at least according to any of the following methods 1-5:

Method 1. The second core network device issues the first EPLMN list to the terminal device according to the tracking area identification code (Tracking Area identity, TAI) of the terminal device, and is included in the first EPLMN list. For example, the second core network delivers the first EPLMN list only in the boundary area or overlapping area between the second access network device and the first access network device.

Mode 2: The second core network device delivers the first EPLMN list to the terminal device according to the capability reported by the terminal device.

Specifically include: method 2.1, the second core network device sends the first EPLMN list to the terminal device under the condition that the terminal device supports 5G SA. Generally speaking, in mode 2.1, the second core network device may be an MME.

Mode 2.2. The second core network device delivers the first EPLMN list to the terminal device when the frequency supported by the terminal device is the same as the frequency of the shared access network. For example, the frequency of the first access network device is 700Mhz. At this time, the second core network device sends the first EPLMN list to the terminal device that only supports 700Mhz.

Mode 2.3. The second core network device delivers the first EPLMN list to the terminal device when the terminal device supports VONR voice and the VONR function is enabled. For example, when operator X only shares the 5G access network (NG-RAN) and 5GC, and does not share LTE and EPC, in the area covered by the first access network equipment alone, the terminal equipment must adopt the VONR mode to work normally Carry out voice services. at this time. The second core network device only issues the first EPLMN list to terminals that support Voice over New Radio (VONR) and turns on the VONR switch, and does not issue the first EPLMN list to terminal devices that only support EPS FALLBACK.

Mode 2.4. The second core network device issues the first EPLMN list to the terminal device when the terminal device is a non-Internet of Things terminal.

Method 3. The second core network device issues the first EPLMN list to the terminal device according to the Subscription Permanent Identifier (SUPI) (3GPP access, SUPI is IMSI) number segment of the terminal device.

Mode 4: The second core network device issues the first EPLMN list to the terminal device when the terminal device has subscribed to the core network sharing service.

Method 5: The second core network device determines whether to send the first EPLMN list to the terminal device according to one or more conditions of the terminal device's TAI, reported capability, SUPI number range, and whether it has signed a core network sharing service.

For example, in mode 5.1, the SUPI number segment of the second core network device in the terminal device belongs to the preset number segment, the frequency supported by the terminal device is the same as that of the shared access network, the terminal device supports VONR voice and the VONR function is enabled, and the terminal device signs In the case that the core network sharing service is enabled and the terminal device is in a preset tracking area code (tracking area code, TAC), the first EPLMN list is issued to the terminal device.

Method 5.2. The SUPI number segment of the second core network device in the terminal device belongs to the preset number segment, the frequency supported by the terminal device is the same as that of the shared access network, the terminal device has signed a core network sharing service, and the terminal device is in the preset In the case of TAC, deliver the first EPLMN list to the terminal equipment.

Mode 5.3. The second core network device issues the first TAC for the terminal device when the frequency supported by the terminal device is the same as the frequency of the shared access network, the terminal device has subscribed to the core network sharing service, and the terminal device is in the preset TAC. List of EPLMNs.

It can be understood that, during the network search process of the terminal device, the search priorities of various types of PLMNs are as follows: RPLMN>EPLMN>HPLMN and EHPLMN>VPLMN. Therefore, in this application, in the first EPLMN list provided by the second access network device and the second core network device for the terminal device, the PLMN ID in the first system message is set to EPLMN, which improves the efficiency of the first access network. Network search priority of the first PLMN network corresponding to the device. In this way, when the terminal device moves within the coverage of the first access network device, it can preferentially access the first access network device and the first core network device.

In addition, the second access network device may deliver the first priority indication information to the terminal device at least according to the following manner 6:

Manner 6: The second access network device delivers the first priority indication information to the terminal device according to the location information of the cell.

An example, when the frequency of the 4G cell of the home network of the terminal device is F1, the frequency of the 5G cell is F2, and the frequency of the first access network device is F3, in the coverage area and coverage edge of the first access network device, The second access network device sets the cell frequency priority as: F2>F3>F1. In this way, the terminal device can first access the 5G network of the home network (including the access network and the core network), secondly access the 5G network of the first PLMN network corresponding to the first access network device, and finally access the 4G network of the home network. network.

It should be noted that the second core network device mentioned above may be the MME in the second PLMN network, or the AMF in the second PLMN network, which is not limited in this application.

Above, the process of delivering the PLMN ID auxiliary parameter to the terminal device by the second access network device and the second core network device has been described.

It should be noted that after the terminal device camps on the first access network device according to the above-mentioned PLMN ID auxiliary parameters, if the first access network device broadcasts the PLMN ID according to the above-mentioned scheme 2 and scheme 3, then the terminal device still HPLMN and EHPLMN will be searched periodically. When any signal of HPLMN and EHPLMN is found, the terminal device will select a cell of HPLMN or EHPLMN through cell selection or cell re-selection. In this case, the terminal device may select or reselect to the 4G cell of the home network.

According to the configuration in the third aspect above, the access network equipment and core network equipment in the 4G network of the home network will notify the terminal equipment to access the first access network equipment through auxiliary parameters. The ping-pong selection between the access network device of the 4G cell of the home network and the first access network device caused the terminal device to fail to reside and use services normally.

In order to solve this technical problem, the first access network device and the first core network device need to issue network selection auxiliary parameters to the terminal device to ensure that the terminal device can reside in the first access network device and the first core network device . The following describes scenario 4 in detail:

Scenario 4: A process in which the first access network device and the second access network device deliver network selection auxiliary parameters to the terminal device.

Wherein, the network selection auxiliary parameter is used to assist the terminal device to enable the terminal device to camp on the second access network device stably after camping on the second access network device.

The network selection assistance parameter includes at least one of the following: a second EPLMN list, and second priority indication information.

The second EPLMN list includes the PLMN ID of the second PLMN network (at least one of the HPLMN and the EHPLMN of the terminal device). For example, when the terminal device is an access network device of operator A, the second EPLMN list includes the PLMN ID of operator A.

The second priority indication information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device. The third access network device is an access network device of a preset network standard in the second PLMN network. In one example, the preset network standard is the 4G network standard.

Specifically, the second core network device may issue the second EPLMN list to the terminal device at least according to any one of the following methods a and b:

Mode a: The first core network device delivers the second EPLMN list to the terminal device according to the SUPI number range or the HPLMN of the terminal device.

Mode b. The first core network device delivers the second EPLMN list to the terminal device according to the TAC of the terminal device, the SUPI number segment of the terminal device, or the HPLMN.

In addition, the second access network device may deliver the second priority indication information to the terminal device at least according to the following manner c:

Mode c: The first access network device delivers the second priority indication information to the terminal device according to the HPLMN of the terminal device.

An example, when the frequency of the 4G cell of the home network of the terminal device is F1, the frequency of the 5G cell is F2, and the frequency of the shared cell is F3, the first access network device sets the cell frequency priority as: F2>F3>F1 . In this way, the terminal device can first access the 5G network of the home network (including the access network and the core network), secondly access the 5G network of the shared network, and finally access the 4G network of the home network.

In Scenario 4, the core network device sets the HPLMN of the terminal device as the EPLMN by sending the second EPLMN list to the terminal device. In this way, the terminal device determines the PLMN and PLMN currently selected by the terminal device according to the first EPLMN list and the second EPLMN list. The HPLMNs of the terminal equipment are all PLMNs in the EPLMN list. The selection priority of the PLMN selected by the terminal equipment and the HPLMN of the terminal equipment is the same, and the terminal equipment will not perform the selection and reselection process according to its HPLMN. The first access network device also issues instruction information to the terminal device, instructing the first access network device to prioritize the frequency of the cell higher than the priority of the 4G cell of the home network.

In this way, after camping on the first access network device, the terminal device will not search for HPLMN or EHPLMN, and perform cell selection and cell reselection. And in the scenario where the first access device and the third access network device are covered at the same time, the first access network device is preferentially accessed.

Scenario 5: A process in which the second core network device performs access control, policy control, network selection, and charging settlement for the terminal device.

Method A. The first core network equipment supports access control to terminal equipment, including but not limited to:

1) Configure to allow terminal devices in the first preset SUPI number segment to access.

2). The configuration does not allow terminal devices in the second preset SUPI number segment to access.

3) The configuration does not allow terminal devices in the third preset SUPI number segment that do not meet the preset capability requirements to access. For example, for a terminal device of operator A, if the terminal device does not support the VONR capability, the configuration does not allow the terminal device to access.

4) The configuration allows the terminal equipment that selects the preset PLMN ID in the fourth preset SUPI number segment to access.

Mode B. The first core network equipment supports policy control on terminal equipment, including but not limited to:

1). For the slice requested by the terminal device, or the slice delivered by the second core network device, access is rejected.

2) For the slice requested by the terminal device, or the slice delivered by the second core network device, it is mapped to other slices.

3) For the quality of service (Quality of Service, QoS) requested by the terminal device, or the QoS delivered by the second core network device, access is refused.

Mode C, the network selection function of the first core network device.

1), the first core network device determines the core network (second core network) subscribed by the terminal device according to the PLMN ID selected when the terminal device accesses the first access network device. The first core network device forwards the signaling and data of the terminal device to the second core network device.

When the first access network device broadcasts the PLMN ID using the above scheme 2, the first core network device may use the PLMN ID selected by the terminal device as a parameter for network selection.

For example, in conjunction with FIG. 2, the first core network device routes the signaling and data of the terminal device to the core network of operator A in the case that the terminal device accesses the first access network device is selected as PLMN ID (A). in the device.

2). The first core network device determines the core network (the second core network) to which the terminal device subscribes according to the HPLMN of the terminal device or the SUPI number segment of the terminal device. The first core network device forwards the signaling and data of the terminal device to the second core network device.

When the first access network device uses the above method 3 to broadcast the PLMN ID, the first core network device needs to use the HPLMN of the terminal device or the SUPI of the terminal device as a parameter for network selection. When the first access network device broadcasts the PLMN ID in the above mode 2, the first core network device can use the HPLMN of the terminal device or the SUPI of the terminal device as a parameter for network selection.

For example, in conjunction with FIG. 2, the first core network device routes the signaling and data of the terminal device to the core network device of operator A when the HPLMN of the terminal device is PLMN ID (A).

3), the first core network device jointly determines the core network (second core network) subscribed by the terminal device according to the PLMN ID selected when the terminal device accesses the first access network device and the HPLMN (or SUPI number segment) of the terminal device. The first core network device forwards the signaling and data of the terminal device to the second core network device.

When the first access network device uses the above method 1 to broadcast the PLMN ID, the first core network device needs to be consistent with the PLMN ID selected when the terminal device accesses the first access network device and the HPLMN (or SUPI number range) of the terminal device. as a parameter for network selection.

For example, in conjunction with Figure 2, the first core network device routes the signaling and data of the terminal device to the operator A's when the HPLMN of the terminal device is PLMN ID (A), and the HPLMN of the terminal device is PLMN ID (A). In the core network equipment.

Mode D, the billing and settlement function of the first core network equipment.

In this application, the service data exchanged between the terminal device and the second core network device is routed and forwarded by the first core network device in the first core network. Therefore, the first core network device can charge the terminal device according to the routed and forwarded data of the terminal device.

In addition, the first core network device may generate a corresponding charging rule according to the type of service data transmitted by the terminal device and send it to the second core network device. The first core network device and the second core network device jointly charge the terminal device according to the same rules, so as to realize the inter-network settlement between different operators (that is, share the access network of operator X and the core network) When the terminal equipment of other operators uses the access network and core network of shared operator X, the fee settlement between other operators and shared operator X).

Above, the first access network device, terminal device, first core network device, second access network device, and second core network device involved in the embodiment of the present application need to execute the corresponding action process and the required realization The function is described in detail:

In the following, the communication system involved in the embodiment of the present application will be further described in detail:

As shown in FIG. 3, it is a schematic structural diagram of a communication system 30 provided by the embodiment of the present application. As shown in FIG. 3, the communication system 30 includes: a terminal device 301, a first access network device 302, a first core network A device 303, and at least one second core network device 304, and a second access network device 305.

The first access network device 302 and the first core network device 303 belong to the first PLMN network; the terminal device 301 and the second core network device 304 belong to the second PLMN network; the first core network device 303 and the second core network device 304 communicate through the communication interface.

Among them, the terminal device 301 is used to access the first core network device 303 through the first access network device 302, and send home network information to the first core network device 303; the home network information is used to represent the home network of the terminal device 301 is the second PLMN network.

The first core network device 303 is configured to determine the second access network device 305 in the second PLMN network according to the home network information.

The terminal device 301 is further configured to send service data to the first core network device 303 .

The first core network device 303 is further configured to forward the service data to the second core network device 304 after receiving the service data.

The above solution brings at least the following beneficial effects: In the communication system provided by the embodiment of the present application, there is a communication interface between the first core network device and the second core network device, through which the first core network device can communicate The service data of the terminal device on the same PLMN network as the second core network device is routed to the second core network device, and the service data of the terminal device is processed by the second core network device.

When the terminal device roams to the area covered by the first access network device, it can access the first access network device, and access to the first core network device through the first access network device. The terminal device sends the home network information of the terminal device to the first core network device, and the first core network device routes the terminal device to a core network device (second core network device) of the home network according to the home network information of the terminal device.

In this way, when the terminal device provides network services through the shared network, the core network device of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal device. Solved the problem that the current shared network cannot control the terminal equipment of other operators.

As a possible implementation manner, the first access network device 302 is configured to send a first system message to the terminal device 301; the first system message includes at least one PLMN ID.

The terminal device 301 is configured to access the first access network device 302 according to at least one PLMN ID.

The terminal device 301 is further configured to access the first core network device 303 through the first access network device 302 .

The above solution brings at least the following beneficial effects: the first access network device broadcasts the PLMN ID to the terminal device. In this way, after the terminal device receives the PLMN ID, it can determine whether it can access the first access network device according to the PLMN ID configured by itself and the PLMN ID broadcast by the first access network device.

As a possible implementation, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the PLMN ID of the second PLMN network broadcast by the second access network device 305; the second access The network device 305 is an access network device in the second PLMN network.

Alternatively, the at least one PLMN ID includes a second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device 305.

Or, at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device 305.

The above solution brings at least the following beneficial effects: the present application provides various methods for the first access network device to broadcast the PLMN ID. The first access network device may directly broadcast the PLMN IDs of all PLMN networks that share the first access network device and the first core network device. In this way, after receiving the first system message, the terminal device can access the first access network device according to the PLMN ID of its home network. Alternatively, the first access network device broadcasts a new PLMN ID for each shared PLMN network, so as to realize the customization of the PLMN ID. Alternatively, the first access network device only broadcasts the PLMN ID of the first PLMN network, and the terminal device accesses the first access network device according to its HPLMN ID or SUPI. In this way, the signaling overhead of the terminal device broadcasting the PLMN ID can be reduced.

As a possible implementation manner, as shown in FIG. 3 , the communication system provided in this embodiment of the present application further includes: a second access network device 305 .

The second core network device 304 is further configured to determine the first EPLMN list, and send the first EPLMN list to the first access network device 302; the first EPLMN list includes one or more PLMN IDs in at least one PLMN ID.

The first access network device 302 is configured to receive the first EPLMN list, and send the first EPLMN list to the terminal device 301 .

The terminal device 301 is configured to receive a first EPLMN list.

The terminal device 301 is further configured to parse the first system message and determine at least one PLMN ID in the first system message; when one or more PLMN IDs in the at least one PLMN ID are the same as the PLMN IDs in the first EPLMN list Next, determine to access the first access network device 302.

The above solution brings at least the following beneficial effects: the second core network device sends the corresponding EPLMN list to the terminal device according to the way the first access network device broadcasts the PLMN ID. The EPLMN list includes all or part of the PLMN IDs broadcast by the first access network device. In this way, after the terminal device moves to the area covered by the first access network device, it can select a PLMN ID from the first system message according to the EPLMN list, and access to the first access network device according to the PLMN ID. The problem that the terminal device cannot access the first access network device is avoided.

As a possible implementation, the first EPLMN list is an EPLMN list issued by the second core network device 304 to the terminal device 301 when the terminal device 301 meets the first preset condition; the first preset condition includes at least one of the following :

End devices are located in preset areas.

The terminal device is a terminal device 301 supporting 5G SA.

The terminal device is a terminal device 301 that supports preset frequencies.

The terminal device is a terminal device 301 that supports and enables the VONR voice service.

The terminal device is a non-Internet of Things terminal device 301 .

The SUPI number segment of the terminal device is the first preset SUPI number segment.

The terminal device is a terminal device 301 that subscribes to a core network service sharing the first PLMN network.

The above solution brings at least the following beneficial effects: the second core network only configures the EPLMN list for a specific terminal device, and does not need to configure the EPLMN list for all terminal devices. The waste of transmission resources between the second core network equipment, the second access network equipment and the terminal equipment is avoided.

As a possible implementation manner, the second access network device 305 is further configured to determine the first priority indication information, and send the first priority indication information to the terminal device 301; the first priority indication information is used to indicate: The priority of the terminal device 301 to access the first access network device 302 is higher than the priority of the terminal device 301 to access the third access network device; the third access network device is of the preset network standard in the second PLMN network access network equipment.

The terminal device 301 is further configured to receive the first priority indication information, and access the first access network device when the first access network device 302 and the third access network device are included in the area of the first access network device 302 device 302 .

The above solution brings at least the following beneficial effects: the second access network device indicates that the priority of the frequency of the first access network device is higher than the frequency of the third access network device (such as 4G access network device) in the second PLMN network priority. In this way, when the second access network device is a 5G access network device, the terminal device preferentially accesses the second access network device of the 5G network standard within the coverage area of the second access network device. Ensure that terminal equipment can access higher-standard networks and use higher-standard networks to provide communication services.

As a possible implementation, the first core network device 303 is further configured to determine the second EPLMN list, and send the second EPLMN list to the first access network device 302; the second EPLMN list includes the second PLMN network PLMN ID.

The first access network device 302 is further configured to receive the second EPLMN list, and forward the second EPLMN list to the terminal device 301 .

The terminal device 301 is configured to receive the second EPLMN list, and perform cell selection or cell reselection according to the second EPLMN list.

The above scheme brings at least the following beneficial effects: after the terminal device accesses the first access network device and the first core network device, the first core network device sends the second EPLMN list to the terminal device, and the HPLMN network selection of the terminal device The priority is adjusted to be the same as the network selection of the first PLMN network. In this way, after camping on the first access network device, the terminal device will not continue to search for signals of the second PLMN network, and select or reselect to the second PLMN network. Therefore, the terminal device can stably reside in the second access network device, and the situation of ping-pong network selection in the terminal device is avoided.

As a possible implementation manner, the second EPLMN list is an EPLMN list delivered by the first core network device 303 to the terminal device 301 when the terminal device 301 satisfies the second preset condition.

The second preset condition includes at least one of the following:

The SUPI number segment of the terminal device 301 is the second preset SUPI number segment.

The HPLMN of the terminal device 301 is the PLMN of the second PLMN network.

The terminal device 301 is located in a preset TAC.

The above solution brings at least the following beneficial effects: the first core network only configures the EPLMN list for a specific terminal device, and does not need to configure the EPLMN list for all terminal devices. The waste of transmission resources between the first core network equipment, the first access network equipment and the terminal equipment is avoided.

As a possible implementation manner, the first access network device 302 is further configured to determine the second priority indication information, and send the second priority indication information to the terminal device 301; the second priority indication information is used to indicate: The priority for the terminal device 301 to access the first access network device 302 is higher than the priority for the terminal device 301 to access the third access network device in the second PLMN network.

The terminal device 301 is configured to receive the second priority indication information, and when the coverage area of the first access network device 302 includes the first access network device 302 and the third access network device, access the first access network device Network device 302.

The above solution brings at least the following beneficial effects: the first access network device indicates that the priority of the frequency of the first access network device is higher than the frequency of the third access network device (such as 4G access network device) in the second PLMN network priority. In this way, when the second access network device is a 5G access network device, after the terminal device accesses the first access network device, it will not reselect to the second access network device when it detects the signal of the third access network device. 3. Access network equipment. Therefore, the terminal device can stably reside in the second access network device, and the situation of ping-pong network selection in the terminal device is avoided.

As a possible implementation manner, the terminal device 301 is specifically configured to: parse the first system message, and determine at least one PLMN ID.

In the case where the first PLMN ID exists in the terminal device 301, access the first access network device 302 according to the first PLMN ID; the first PLMN ID is the same as a PLMN ID in at least one of the first system messages PLMN ID.

In the case that the first PLMN ID does not exist in the terminal device 301, the signal of the second PLMN network is searched, and after the signal of the second PLMN network is searched, the access network device of the second PLMN network is accessed.

A first EPLMN list is received from an access network device of a second PLMN network.

Determine the first PLMN ID according to the first EPLMN list, and access the first access network device 302 according to the first PLMN ID.

If the terminal device 301 does not search for the signal of the second PLMN network, then select a PLMN ID from at least one PLMN ID, and initiate access to the first access network device 302 according to the PLMI ID.

If the access is successful, a PLMN ID is used as the first PLMN ID.

If the access fails, another PLMN ID is selected to initiate access to the first access network device 302 until the access is successful, and the PLMN ID when the access is successful is used as the first PLMN ID.

After determining the first PLMN ID, send the first PLMN ID to the first access network device 302.

The above scheme brings at least the following beneficial effects: the terminal device selects the PLMN ID according to the PLMN ID in the first system message and the PLMN ID (such as the EPLMN list) configured by the second core network device for the terminal device and accesses the first access network equipment.

If the terminal device does not receive the PLMN ID configured by the second core network device for the terminal device, the terminal device can first access the second access network device and the second core network device to obtain the second core network device as the terminal device Configured PLMN ID. After that, select the PLMN ID and access the first access network device according to the PLMN ID in the first system message and the PLMN ID configured for the terminal device by the second core network device (for example, the EPLMN list).

If the terminal device does not receive the PLMN ID configured by the second core network device for the terminal device, and cannot search for the signal of the second PLMN network, then the terminal device tries to access the first PLMN network according to each PLMN ID in the first system message. The access network device and the first core network device will use the successfully accessed PLMN ID as the first PLMN ID until the access is successful.

In this way, the terminal device can access the first access network device according to the first system message. In addition, the terminal device may also send the first PLMN ID to the first core network device, so that the first core network device determines the home network of the terminal device according to the first PLMN ID.

As a possible implementation manner, the first access network device 302 is further configured to receive the first PLMN ID, and forward the first PLMN ID to the first core network device 303.

The above solution brings at least the following beneficial effects: the terminal device can forward the first PLMN ID to the first core network device through the first access network device.

As a possible implementation manner, the first core network device 303 is further configured to: receive the first PLMN ID, and determine the second core network device 304 according to the first PLMN ID.

The above solution brings at least the following beneficial effects: the first core network device determines the home network of the terminal device according to the first PLMN ID, and routes the service data of the terminal device according to the home network of the terminal device.

As a possible implementation, the home network information includes at least one of the following: the PLMN ID selected when the terminal device 301 accesses the first access network device 302, the SUPI of the terminal device 301, and the HPLMN of the terminal device 301.

The above solution brings at least the following beneficial effects: based on this, when the terminal device accesses the first access network device and the first core network device using different attribution network information, the first core network device can determine the attribution of the terminal device network.

As a possible implementation, the first core network device 303 is also configured to perform access control on the terminal device 301; the access control includes at least one of the following:

In the case that the SUPI number segment of the terminal device 301 is the first preset SUPI number segment, the terminal device 301 is allowed to access.

When the SUPI number segment of the terminal device 301 is the second preset number segment, the access of the terminal device 301 is rejected.

When the SUPI number segment of the terminal device 301 is the third preset number segment, and the capability of the terminal device 301 does not include the preset capability, the access of the terminal device 301 is denied.

When the first PLMN ID determined by the terminal device 301 is the preset PLMN ID, and the SUPI of the terminal device 301 is the preset SUPI, the terminal device 301 is allowed to access.

The above solution brings at least the following beneficial effects: based on the above technical solution, the first core network device can perform access control on terminal devices, so that terminal devices that meet the sharing requirements can access the first core network device to realize core network sharing.

As a possible implementation, the first core network device 303 is also configured to perform policy control on the terminal device 301; the policy control includes at least one of the following:

The first type of slice access of the terminal device 301 is rejected; the first type of slice is a slice requested by the terminal device 301 , or a preset type of slice delivered by the second core network device 304 to the first core network device 303 .

The first type of slice is mapped to the second type of slice, and the access of the second type of slice is allowed.

The first type of QoS access of the terminal device 301 is rejected; the first type of QoS is the QoS requested by the terminal device 301 , or the preset type of QoS issued by the second core network device 304 to the terminal device 301 .

The first type of QoS is mapped to the second type of QoS, and the second type of QoS access is allowed.

The above solution brings at least the following beneficial effects: based on the above technical solution, the first core network device can perform policy control on the terminal device in a scenario where the core network is shared.

As a possible implementation manner, the first core network device 303 is further configured to charge the terminal device 301 according to the data traffic of the service data when forwarding the service data to the second core network device 304 .

The above solution brings at least the following beneficial effects: based on the above technical solution, the first core network device can control the charging of the terminal device in the scenario of core network sharing.

Above, the communication system provided by the embodiment of the present application is further described in detail.

The communication provided by the embodiment of this application will be described in detail below:

The embodiment of the present application also provides a communication method, which can be applied to the communication system shown in FIG. 3 . As shown in Figure 4, the communication method also includes the following S401-S405:

S401. The terminal device accesses the first core network device.

In a possible implementation manner, the terminal device accesses the first core network device through the first access network device.

Wherein, the first access network device and the first core network device belong to the first PLMN network; the terminal device belongs to the second PLMN network; the first core network device and the second core network device communicate through the communication interface; the second The core network equipment is the core network equipment in the second PLMN network.

It should be pointed out that in the embodiment of the present application, the first core network device and the second core network device may be connected through interfaces such as N9/N16/N8/N12/N24/N32/N14+. Alternatively, the first core network device and the second core network device may also be connected through other communication interfaces, which is not limited in this application.

In this embodiment of the application, the first core network device and the second core network device are mainly 5G core network devices, and the first access network device is a 5G access network device as an example for illustration. During specific implementation, the first core network device, the second core network device, and the first access network device may also be network devices of other network standards, which is not limited in this application.

S402. The terminal device sends home network information to the first core network device. Correspondingly, the first core network device receives the home network information from the terminal device.

In a possible implementation manner, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

S403. The first core network device determines the second access network device in the second PLMN network according to the home network information.

In a possible implementation manner, when the home network information is the PLMN ID selected when the terminal device accesses the first access network device, the first core network device determines that the PLMN network corresponding to the PLMN ID is the terminal device attribution network.

It should be pointed out that when the terminal device selects the PLMN ID according to the first system message, when the terminal device includes its HPLMN in the first system message, it will access the first access network device by selecting the HPLMN. At this time, the first core network device may determine the home network of the terminal device according to the PLMN ID selected by the terminal device.

In another possible implementation manner, when the home network information includes the SUPI of the terminal device, the first core network device may parse out the HPLMN of the terminal device from the SUPI, and determine the home network of the terminal device according to the HPLMN of the terminal device.

In yet another possible implementation manner, when the home network information includes the HPLMN of the terminal device, the first core network device directly determines the home network of the terminal device according to the HPLMN of the terminal device.

S404. The terminal device sends service data to the first core network device. Correspondingly, the first core network device receives service data from the terminal device.

Wherein, the service data is service data that the terminal device needs to transmit to the second core network device.

In a possible implementation manner, the terminal device sends service data to the first core network device through the first access network device. Specifically, the terminal device sends service data to the first access network device. After receiving the service data from the terminal device, the first access network device forwards the service data to the first core network device.

S405. The first core network device forwards the service data of the terminal device to the second core network device.

That is to say, when the first PLMN network and the second PLMN network share the access network and the core network, the terminal device can transmit services to the second core network device through the first access network device and the first core network device data. It can be understood that, after receiving the service data, the second core network processes the service data, and returns a processing result to the terminal device through the first core network device. In addition, the second core network device may also send signaling messages or user plane data to the terminal device through the first core network device.

The above solution brings at least the following beneficial effects: In the communication system provided by the embodiment of the present application, there is a communication interface between the first core network device and the second core network device, through which the first core network device can communicate The service data of the terminal device on the same PLMN network as the second core network device is routed to the second core network device, and the service data of the terminal device is processed by the second core network device.

When the terminal device roams to the area covered by the first access network device, it can access the first access network device, and access to the first core network device through the first access network device. The terminal device sends the home network information of the terminal device to the first core network device, and the first core network device routes the terminal device to a core network device (second core network device) of the home network according to the home network information of the terminal device.

In this way, when the terminal device provides network services through the shared network, the core network device of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal device. Solved the problem that the current shared network cannot control the terminal equipment of other operators.

It should be noted that, before the above S401, the terminal device needs to obtain the PLMN ID broadcast by the first access network device, and access to the first access network device according to the PLMN ID. The following is a detailed introduction:

In a possible implementation manner, the terminal device resides behind the first access network device, and initiates registration with the first core network device. After the registration is successful, the terminal device successfully accesses the first core network device.

Above, the process of the terminal device accessing the first access network device and the first core network device according to the PLMN ID broadcast by the first access network device has been described.

For the beneficial effects of the above solution, refer to the above scenario 1 and scenario 2, and the beneficial effects of the content related to the communication system in FIG. 3 , which will not be repeated here.

In the following, the process for the terminal device to access the first access network device according to the first EPLMN list and the first priority indication information is described:

As shown in Figure 5, the communication method provided by the embodiment of the present application, before S401, the communication method provided by the embodiment of the present application further includes:

S501. The second core network device generates a first EPLMN list.

S502. The second core network device sends the first EPLMN list to the second access network device. Correspondingly, the second access network device receives the first EPLMN list from the second core network device.

S503. The second access network device sends the first EPLMN list to the terminal device. Correspondingly, the terminal device receives the first EPLMN list from the second access network device.

Wherein, the process of the second core network device generating the first EPLMN list and sending the first EPLMN list to the terminal device in the above S501-S503 can refer to the relevant description in the above scenario 3, which will not be repeated here.

If they are the same, the terminal device accesses the first access network device.

In addition, as shown in Figure 5, the method also includes:

S504. The second access network device generates first priority indication information.

S505. The second access network device sends the first priority indication information to the terminal device. Correspondingly, the terminal device receives the first priority indication information from the second access network device.

S506. When the terminal device includes the first access network device and the third access network device in the area of the first access network device, access the first access network device.

It should be pointed out that the second access network device and the second core network device may issue the first EPLMN to the terminal device before the terminal accesses the second access network device and moves to the coverage area of the first access network device. list and first priority indications.

Alternatively, the second access network device and the second core network device may simultaneously search for the signals of the first access network device and the second access network device after the terminal device moves to the coverage area of the first access network device , after first accessing the second access network device, the second access network device and the second core network device deliver the first EPLMN list and the first priority indication information to the terminal device. This application does not limit this.

Wherein, in the foregoing S504-S506, the understanding of the first priority indication information may refer to the relevant description in the foregoing scenario 3, which will not be repeated here.

The process in which the terminal device accesses the first access network device according to the first EPLMN list and the first priority indication information is described above.

For the beneficial effects brought by the above solutions, refer to the above scenario 3 and the beneficial effects of the content related to the communication system in FIG. 3 , which will not be repeated here.

Combined with Figure 4, as shown in Figure 5, the above S401 can be specifically implemented through the following S507-S509:

S507. The first access network device sends a first system message. Correspondingly, the terminal device receives the first system message from the first access network device.

Wherein, the first access network device is an access network device in the first PLMN network. The first system message includes at least one PLMN ID. The PLMN ID included in the first system message can be understood with reference to the manner in which the first access network device broadcasts the PLMN ID in scenario 1 above, and details are not repeated here.

S508. The terminal device accesses the first access network device according to at least one PLMN ID in the first system message.

Wherein, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the PLMN ID of the second PLMN network broadcast by the second access network device. (corresponding to Scenario 1 in Scenario 1 above).

Alternatively, the at least one PLMN ID includes a second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device. (corresponding to Scenario 2 in Scenario 1 above).

Or, at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device. (corresponding to Scenario 3 in Scenario 1 above).

The process of the terminal device accessing the first access network device according to at least one PLMN ID in the first system message can be understood by referring to the process of the terminal device selecting the PLMN ID in the above scenario 2, and will not be repeated here.

It can be understood that the terminal device accessing the first access network device includes: the terminal device resides in the first access network device.

In a possible implementation manner, the terminal device accesses the first access network device according to the first EPLMN list and the first system message.

Specifically, the terminal device parses the first system message, and determines at least one PLMN ID in the first system message.

The terminal device determines whether one or more PLMN IDs in at least one PLMN ID are the same as the PLMN IDs in the first EPLMN list.

S509. The terminal device accesses the first core network device through the first access network device.

After the terminal device camps on the first access network device, the first access network device and the second access network device may also enable the terminal device to stably camp on the first access network device in the following manner.

As shown in Figure 5, the communication method provided in the embodiment of the present application, after S503, further includes:

S510. The first core network device generates a second EPLMN list.

S511. The first core network device sends the second EPLMN list to the first access network device. Correspondingly, the first access network device receives the second EPLMN list from the first core network device.

S512. The first access network device sends the second EPLMN list to the terminal device. Correspondingly, the terminal device receives the second EPLMN list from the first access network device.

S513. The terminal device performs cell selection or cell reselection according to the second EPLMN list.

Wherein, the process of the first core network device generating the second EPLMN list and sending the second EPLMN list to the terminal device in the above S510-S513 can refer to the relevant description in the above scenario 4, which will not be repeated here.

In addition, as shown in Figure 5, the method also includes:

S514. The first access network device generates second priority indication information.

S515. The first access network device sends the second priority indication information to the terminal device. Correspondingly, the terminal device receives the second priority indication information from the first access network device.

S516. When the coverage area of the first access network device includes the first access network device and the third access network device, the terminal device accesses the first access network device.

Wherein, in the foregoing S514-S516, the understanding of the first priority indication information may refer to the relevant description in the foregoing scenario 4, which will not be repeated here.

The process of the terminal device stably camping on the first access network device according to the second EPLMN list and the second priority indication information has been described above.

For the beneficial effects brought by the above solution, refer to the above scenario 4 and the beneficial effects of the content related to the communication system in FIG. 3 , which will not be repeated here.

It should be pointed out that in the above S508, it is recorded that the terminal device accesses the first access network device according to at least one PLMN ID in the first system message.

Hereinafter, the specific implementation process of the above S508 will be described in detail.

As shown in Figure 6, the communication method provided by the embodiment of the present application can be implemented in the above S502 through the following process:

S601. The terminal device parses the first system message to determine at least one PLMN ID.

Specifically, after receiving the first system message, the terminal device parses the first system message to determine at least one PLMN ID carried in the first system message.

S602. The terminal device determines whether the first PLMN ID exists in the terminal device.

Wherein, the first PLMN ID is the same PLMN ID as a PLMN ID in at least one of the first system messages.

That is to say, the terminal device determines whether there is a PLMN ID identical to at least one PLMN ID in the first system message in the EPLMN list of the terminal device. If it exists, use the PLMN ID as the first PLMN ID.

S603. If it exists, the terminal device accesses the first access network device according to the first PLMN ID.

It should be pointed out that if the first PLMN ID exists in the terminal device, it means that the first access network device supports the core network of the home network of the terminal device. At this time, the terminal device directly accesses the first access network device according to the first PLMN ID.

For example, after the second access network device sends the first EPLMN list to the terminal device, the terminal device receives the first system message, parses the first system message, and determines that the first system message includes the same information as that in the first EPLMN list. PLMN ID. The terminal device uses the same PLMN ID as the first PLMN ID.

S604. If it does not exist, the terminal device searches for a signal of the second PLMN network.

Wherein, the second PLMN network is the home network of the terminal device. Since the second PLMN network has not built a 5G network within the coverage area of the first access network device, therefore, in S604, the signal of the second PLMN network that the terminal device searches more may be the signal of the 4G cell in the second PLMN network Signal.

S605. When the signal of the second PLMN network is found, the terminal device accesses the access network device and the core network device of the second PLMN network.

After accessing the access network device and the core network device of the second PLMN network, the access network device and the core network device of the second PLMN network refer to the above scenario 3, the second core network device and the second access network device The process of sending the PLMN ID auxiliary parameters to the terminal device is to send the first EPLMN list and the first priority indication information to the terminal device.

S606. The terminal device receives the first EPLMN list from the access network device of the second PLMN network.

S607. The terminal device determines the first PLMN ID according to the first EPLMN list, and accesses the first access network device according to the first PLMN ID.

Wherein, this process may be implemented with reference to the above-mentioned process of S603, which will not be repeated here.

S608. When no signal of the second PLMN network is found, the terminal device selects a PLMN ID from at least one PLMN ID, and initiates access to the first access network device according to the PLMI ID.

S609. The terminal device determines whether to successfully access the first access network device.

If yes, the terminal device executes the following S610.

S610. The terminal device uses the one PLMN ID as the first PLMN ID.

If not, the terminal device executes the following S611.

S611. The terminal device selects another PLMN ID to initiate access to the first access network device until the access is successful, and uses the PLMN ID when the access is successful as the first PLMN ID.

An example, in the case where at least one PLMN ID includes PLMN-ID (XA), PLMN-ID (XB), and PLMN-ID (XC), the terminal equipment of operator A selects one of the three PLMN IDs The PLMN-ID(XB) tries to access the first access network device. The first access network device determines that the PLMN ID does not match the terminal device, and rejects the access of the terminal device.

The terminal device of operator A selects one PLMN-ID (XA) from the three PLMN IDs again to try to access the first access network device. The first access network device determines that the PLMN ID matches the terminal device, and then allows access of the terminal device.

S612. The terminal device sends the first PLMN ID to the first access network device. Correspondingly, the first access network device receives the first PLMN ID from the terminal device.

After that, the first access network device sends the first PLMN ID to the first core network device. Correspondingly, the first core network device receives the first PLMN ID from the first access network device.

After the first core network receives the first PLMN ID, the first core network device determines the home network of the terminal device according to the first PLMN ID. And route the terminal device to the core network of its home network.

The above scheme brings at least the following beneficial effects: after receiving the PLMN ID broadcast by the first access network device, the terminal device can select a PLMN ID in different ways and access the first access network device. The success rate of terminal equipment accessing the first access network equipment is improved.

It can be seen that the foregoing mainly introduces the technical solutions provided by the embodiments of the present application from the perspective of methods. In order to realize the above functions, it includes corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that, in combination with the modules and algorithm steps of the examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

In the embodiment of the present application, the functional modules of the communication device may be divided according to the above method example. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. Optionally, the division of modules in this embodiment of the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

As shown in FIG. 7 , it is a schematic structural diagram of a communication device provided in an embodiment of the present application, and the communication device may be the above-mentioned terminal device. The access network device includes: a communication unit 701 and a processing unit 702 .

The processing unit 702 is configured to instruct the communication unit 701 to access the first core network device through the first access network device; the first access network device and the first core network device belong to the first PLMN network; the terminal device belongs to the second PLMN network; communication between the first core network device and the second core network device through the communication interface; the second core network device is the core network device in the second PLMN network; the processing unit 702 is used to instruct the communication unit 701 to send the first The core network device sends home network information; the home network information is used to indicate that the home network of the terminal device is the second PLMN network; the processing unit 702 is used to instruct the communication unit 701 to send service data to the first core network device.

Optionally, the processing unit 702 is specifically configured to: instruct the communication unit 701 to receive the first system message from the first access network device; the first access network device is an access network device in the first PLMN network; the first The system message includes at least one PLMN ID to access the first access network device according to the at least one PLMN ID; access the first core network device through the first access network device.

Optionally, at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the PLMN ID of the second PLMN network broadcast by the second access network device; or, at least one PLMN ID includes the first PLMN ID The second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device; or, at least one PLMN ID includes a third PLMN ID; the third PLMN ID It is different from the PLMN ID of the second PLMN network broadcast by the second access network device.

Optionally, the processing unit 702 is specifically configured to: instruct the communication unit 701 to receive the first EPLMN list from the second access network device; the first EPLMN list includes one or more PLMN IDs in at least one PLMN ID; When one or more PLMN IDs in at least one PLMN ID are the same as the PLMN ID in the first EPLMN list, determine to access the first access network device.

Optionally, the first EPLMN list is an EPLMN list delivered by the second core network device to the terminal device when the terminal device meets the first preset condition; the first preset condition includes at least one of the following: the terminal device is located in a preset area ; The terminal device is a terminal device that supports 5G SA; the terminal device is a terminal device that supports preset frequencies; the terminal device is a terminal device that supports and opens the VONR voice service; the terminal device is a non-IoT terminal device; the SUPI number range of the terminal device is the first preset SUPI number segment; the terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.

Optionally, the processing unit 702 is specifically configured to: instruct the communication unit 701 to receive the first priority indication information from the second access network device; the first priority indication information is used to indicate: the terminal device accesses the first access network device; The priority of the network equipment is higher than the priority of the terminal equipment to access the third access network equipment; the third access network equipment is the access network equipment of the preset network standard in the second PLMN network; When the device area includes the first access network device and the third access network device, instruct the communication unit 701 to access the first access network device.

Optionally, the processing unit 702 is further configured to: instruct the communication unit 701 to receive the second EPLMN list from the first access network device; the second EPLMN list includes the PLMN ID of the second PLMN network; Cell selection or cell reselection.

Optionally, the second EPLMN list is an EPLMN list delivered by the first core network device to the terminal device when the terminal device meets the second preset condition; the second preset condition includes at least one of the following: the SUPI number segment of the terminal device is the second preset SUPI number segment; the HPLMN of the terminal device is the PLMN of the second PLMN network; the terminal device is located in the preset TAC.

Optionally, the processing unit 702 is further configured to: instruct the communication unit 701 to receive the second priority indication information from the first access network device; the second priority indication information is used to indicate: the terminal device accesses the first access network The priority of the device is higher than the priority of the terminal device accessing the third access network device in the second PLMN network; the coverage area of the first access network device includes the first access network device and the third access network device, instruct the communication unit 701 to access the first access network device.

Optionally, the processing unit 702 is specifically configured to: the terminal device parses the first system message, and determines at least one PLMN ID; if the terminal device has the first PLMN ID, instruct the communication unit 701 to access the system according to the first PLMN ID The first access network device; the first PLMN ID is the same PLMN ID as one of the PLMN IDs in at least one of the first system messages; when the first PLMN ID does not exist in the terminal device, search for the second PLMN network After searching for the signal of the second PLMN network, access the access network device of the second PLMN network; instruct the communication unit 701 to receive the first EPLMN list from the access network device of the second PLMN network; according to the first EPLMN list, determine the first PLMN ID, and access the first access network device according to the first PLMN ID; if the terminal device does not search for the signal of the second PLMN network, select a PLMN ID from at least one PLMN ID, and Initiate access to the first access network device according to the PLMI ID; if the access is successful, use a PLMN ID as the first PLMN ID; if the access fails, select another PLMN ID to connect to the first access network device Initiate access until the access is successful, using the PLMN ID when the access is successful as the first PLMN ID; after determining the first PLMN ID, instruct the communication unit 701 to send the first PLMN ID to the first access network device.

Optionally, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

Optionally, the communication device may further include a storage module, configured to store program codes and/or data of the communication device.

Wherein, the processing unit 702 may be a processor or a controller. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on. The communication unit 701 may be a transceiver circuit or a communication interface or the like. The storage module may be a memory. When the processing unit 702 is a processor, the communication unit 701 is a communication interface, and the storage module is a memory, the terminal device involved in this embodiment of the present application may be the terminal device shown in FIGS. 1-3 .

As shown in FIG. 8 , it is a schematic structural diagram of another communication device provided in the embodiment of the present application, and the communication device may be the above-mentioned first core network device. The terminal device includes: a communication unit 801 and a processing unit 802 .

The processing unit 802 is configured to instruct the communication unit 801 to receive home network information from the terminal device; wherein, the terminal device accesses the first core network device through the first access network device; the first access network device and the first core network device Belonging to the first PLMN network; the terminal device belongs to the second PLMN network; the first core network device and the second core network device communicate through the communication interface; the second core network device is a core network device in the second PLMN network; The home network information is used to indicate that the home network of the terminal device is the second PLMN network; the processing unit 802 is also used to determine the second access network device in the second PLMN network according to the home network information; the processing unit 802 is also used to The communication unit 801 is instructed to receive service data from the terminal device; the processing unit 802 is further configured to instruct the communication unit 801 to forward the service data to the second core network device.

Optionally, the processing unit 802 is specifically configured to: determine the second EPLMN list; the second EPLMN list includes the PLMN ID of the second PLMN network; instruct the communication unit 801 to send the second EPLMN list to the first access network device.

Optionally, the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device, and the HPLMN of the terminal device.

Optionally, the processing unit 802 is also configured to perform access control on the terminal device; the access control includes at least one of the following: when the SUPI number segment of the terminal device is the first preset SUPI number segment, the terminal device is allowed to Access; when the SUPI number segment of the terminal device is the second preset number segment, deny terminal device access; when the SUPI number segment of the terminal device is the third preset number segment, and the capability of the terminal device does not include the preset number segment When the capability is set, the terminal device is denied access; when the first PLMN ID determined by the terminal device is the preset PLMN ID, and the SUPI of the terminal device is the preset SUPI, the terminal device is allowed to access.

Optionally, the processing unit 802 is also configured to perform policy control on the terminal device; the policy control includes at least one of the following: denying the first type of slice access of the terminal device; the first type of slice is a slice requested by the terminal device, or The second core network device sends a preset type of slice to the first core network device; maps the first type of slice to the second type of slice, allowing the access of the second type of slice; rejecting the first type of QoS access of the terminal device input; the first type of QoS is the QoS requested by the terminal device, or the preset type of QoS issued by the second core network device to the terminal device; the first type of QoS is mapped to the second type of QoS, allowing the second type QoS access.

Optionally, the processing unit 802 is further configured to charge the terminal device according to the data traffic of the service data when forwarding the service data to the second core network device.

Optionally, the communication device may further include a storage module, configured to store program codes and/or data of the communication device.

Wherein, the processing unit 802 may be a processor or a controller. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on. The communication unit 801 may be a transceiver circuit or a communication interface or the like. The storage module may be a memory. When the processing unit 802 is a processor, the communication unit 801 is a communication interface, and the storage module is a memory, the terminal device involved in this embodiment of the present application may be the first core network device shown in FIGS. 1-3 .

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated according to needs It is completed by different functional modules, that is, the internal structure of the network node is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the system, modules, and network nodes described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.

The embodiment of the present application also provides a computer-readable storage medium, and instructions are stored in the computer-readable storage medium. When a computer executes the instructions, the computer executes each step in the method flow shown in the above-mentioned method embodiments.

Embodiments of the present application provide a computer program product containing instructions, and when the instructions are run on a computer, the computer is made to execute the communication method in the above method embodiments.

An embodiment of the present application provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the communication method in the above method embodiments.

Wherein, the computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connection having one or more wires, portable computer disk, hard disk. Random access memory (Random Access Memory, RAM), read-only memory (Read-Only Memory, ROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, EPROM), registers, hard disk, optical fiber, portable compact Disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium in a suitable combination of the above, or values in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and the storage medium may be located in an Application Specific Integrated Circuit (ASIC). In the embodiments of the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, apparatus or device.

Since the devices, equipment, computer-readable storage media, and computer program products in the embodiments of the present invention can be applied to the above-mentioned methods, the technical effects that can be obtained can also refer to the above-mentioned method embodiments, and the embodiments of the present application are hereby No longer.

The above is only a specific implementation of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical scope disclosed in the application should be covered within the protection scope of the application . Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (36)

1. A communication system, characterized by comprising: a terminal device, a first access network device, a first core network device, and a second core network device;

   The first access network device and the first core network device belong to the first public land mobile network PLMN network; the terminal device and the second core network device belong to the second PLMN network; the first The core network device communicates with the second core network device through a communication interface;

   Wherein, the terminal device is configured to access the first core network device through the first access network device, and send home network information to the first core network device; the home network information is used to represent The home network of the terminal device is the second PLMN network;

   The first core network device is configured to determine the second access network device in the second PLMN network according to the home network information;

   The terminal device is further configured to send service data to the first core network device;

   The first core network device is further configured to forward the service data to the second core network device after receiving the service data.
2. The system according to claim 1, wherein the first access network device is configured to send a first system message to the terminal device; the first system message includes at least one PLMN identification ID;

   The terminal device is configured to access the first access network device according to the at least one PLMN ID;

   The terminal device is further configured to access the first core network device through the first access network device.
3. The system according to claim 2, wherein the at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the first PLMN ID broadcast by the second access network device. The PLMN ID of the second PLMN network; the second access network device is an access network device in the second PLMN network;

   Or, the at least one PLMN ID includes a second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device;

   Alternatively, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device.
4. The system according to claim 3, further comprising: a second access network device;

   The second core network device is further configured to determine a first equivalent public land mobile network EPLMN list, and send the first EPLMN list to the first access network device; the first EPLMN list includes the One or more PLMN IDs in the at least one PLMN ID;

   The first access network device is configured to receive the first EPLMN list, and send the first EPLMN list to the terminal device;

   The terminal device is configured to receive the first EPLMN list;

   The terminal device is further configured to parse the first system message, and determine at least one PLMN ID in the first system message; one or more PLMN IDs in the at least one PLMN ID are related to the first If the PLMN IDs in the EPLMN list are the same, determine to access the first access network device.
5. The system according to claim 4, wherein the first EPLMN list is an EPLMN list delivered by the second core network device to the terminal device when the terminal device meets the first preset condition; the The first preset condition includes at least one of the following:

   The terminal device is located in a preset area;

   The terminal equipment is a terminal equipment supporting the fifth generation mobile communication technology 5G independent networking SA;

   The terminal equipment is a terminal equipment supporting a preset frequency;

   The terminal equipment is a terminal equipment supporting and opening a new air interface voice VONR voice service;

   The terminal equipment is a non-Internet of Things terminal equipment;

   The user permanent identifier SUPI number segment of the terminal device is the first preset SUPI number segment;

   The terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.
6. The system according to claim 4, wherein the second access network device is further configured to determine first priority indication information and send the first priority indication information to the terminal device; The first priority indication information is used to indicate: the priority of the terminal device to access the first access network device is higher than the priority of the terminal device to access the third access network device; The third access network device is an access network device of a preset network standard in the second PLMN network;

   The terminal device is further configured to receive the first priority indication information, and when the first access network device and the third access network device are included in the area of the first access network device, Access the first access network device.
7. The system according to any one of claims 2-6, wherein the first core network device is further configured to determine a second EPLMN list, and send the second EPLMN list to the first access network device EPLMN list; The second EPLMN list includes the PLMN ID of the second PLMN network;

   The first access network device is further configured to receive the second EPLMN list, and forward the second EPLMN list to the terminal device;

   The terminal device is configured to receive the second EPLMN list, and perform cell selection or cell reselection according to the second EPLMN list.
8. The system according to claim 7, wherein the second EPLMN list is an EPLMN list issued by the terminal device when the terminal device meets a second preset condition;

   The second preset condition includes at least one of the following:

   The SUPI number segment of the terminal device is the second preset SUPI number segment;

   The HPLMN of the terminal device is the PLMN of the second PLMN network;

   The terminal device is located in a preset Tracking Area Code TAC.
9. The system according to claim 7, wherein the first access network device is further configured to determine second priority indication information and send the second priority indication information to the terminal device; The second priority indication information is used to indicate: the priority of the terminal device to access the first access network device is higher than the terminal device's access to the third access network device in the second PLMN network the priority of

   The terminal device is configured to receive the second priority indication information, and when the coverage area of the first access network device includes the first access network device and the third access network device , accessing the first access network device.
10. The system according to any one of claims 2-6, wherein the terminal device is specifically used for:

    Parsing the first system message to determine the at least one PLMN ID;

    If the first PLMN ID exists in the terminal device, access the first access network device according to the first PLMN ID; the first PLMN ID is at least the same as in the first system message A PLMN ID with the same PLMN ID in one;

    In the case that the first PLMN ID does not exist in the terminal device, search for the signal of the second PLMN network, and after searching for the signal of the second PLMN network, access the access of the second PLMN network network equipment;

    receiving the first EPLMN list from an access network device of the second PLMN network;

    Determine the first PLMN ID according to the first EPLMN list, and access the first access network device according to the first PLMN ID;

    If the terminal device does not search for the signal of the second PLMN network, then select a PLMN ID from the at least one PLMN ID, and initiate access to the first access network device according to the PLMI ID;

    If the access is successful, then use the one PLMN ID as the first PLMN ID;

    If the access fails, another PLMN ID is selected to initiate access to the first access network device until the access is successful, and the PLMN ID when the access is successful is used as the first PLMN ID;

    After the first PLMN ID is determined, send the first PLMN ID to the first access network device.
11. The system according to claim 10, wherein the first access network device is further configured to receive the first PLMN ID and forward the first PLMN ID to the first core network device.
12. The system according to claim 11, wherein the first core network device is further configured to: receive the first PLMN ID, and determine the second core network device according to the first PLMN ID.
13. The system according to claim 12, wherein the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device , the home public land mobile network HPLMN of the terminal device.
14. The system according to claim 12, wherein the first core network device is further configured to perform access control on the terminal device; the access control includes at least one of the following:

    When the SUPI number segment of the terminal device is the first preset SUPI number segment, allowing the terminal device to access;

    When the SUPI number segment of the terminal device is a second preset number segment, rejecting the access of the terminal device;

    When the SUPI number segment of the terminal device is the third preset number segment, and the capability of the terminal device does not include the preset capability, rejecting the access of the terminal device;

    When the first PLMN ID determined by the terminal device is a preset PLMN ID, and the SUPI of the terminal device is a preset SUPI, the terminal device is allowed to access.
15. The system according to claim 12, wherein the first core network device is further configured to perform policy control on the terminal device; the policy control includes at least one of the following:

    Rejecting the first type of slice access of the terminal device; the first type of slice is a slice requested by the terminal device, or a preset issued by the second core network device to the first core network device type of slice;

    Mapping the first type of slice to a second type of slice, allowing access of the second type of slice;

    Rejecting the first type of QoS access of the terminal device; the first type of QoS is the QoS requested by the terminal device, or the preset issued by the second core network device to the terminal device type of QoS;

    Map the first type of QoS to the second type of QoS, and allow the second type of QoS to access.
16. The system according to claim 12, wherein the first core network device is further configured to, when forwarding the service data to the second core network device, The above-mentioned terminal equipment performs billing.
17. A communication method, characterized in that it is applied to a communication system, and the communication system includes: a terminal device, a first access network device, a first core network device, and a second core network device, and the method includes:

    The terminal device accesses the first core network device through the first access network device; the first access network device and the first core network device belong to a first public land mobile network PLMN network; The terminal device belongs to the second PLMN network; the first core network device communicates with the second core network device through a communication interface; the second core network device is the core of the second PLMN network network equipment;

    The terminal device sends home network information to the first core network device; the home network information is used to indicate that the home network of the terminal device is the second PLMN network, so that the first core network device according to The home network information determines the second access network device in the second PLMN network;

    The terminal device sends service data to the first core network device, so that the first core network device forwards the service data to the second core network device after receiving the service data.
18. The method according to claim 17, wherein the terminal device accessing the first core network device comprises:

    The terminal device receives a first system message from a first access network device; the first access network device is an access network device in the first PLMN network; the first system message includes at least one PLMN identification ID;

    The terminal device accesses the first access network device according to the at least one PLMN ID;

    The terminal device accesses the first core network device through the first access network device.
19. The method according to claim 18, wherein the at least one PLMN ID includes the first PLMN ID of the second PLMN network; the first PLMN ID is the first PLMN ID broadcast by the second access network device. PLMN ID of the second PLMN network;

    Or, the at least one PLMN ID includes a second PLMN ID of the second PLMN network; the second PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device;

    Alternatively, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from the PLMN ID of the second PLMN network broadcast by the second access network device.
20. The method according to claim 19, wherein the terminal device accessing the first access network device according to the at least one PLMN ID includes:

    The terminal device receives a first EPLMN list from the second access network device; the first EPLMN list includes one or more PLMN IDs in the at least one PLMN ID;

    In a case where one or more PLMN IDs in the at least one PLMN ID are the same as the PLMN IDs in the first EPLMN list, the terminal device determines to access the first access network device.
21. The method according to claim 20, wherein the first equivalent public land mobile network EPLMN list is that when the terminal device meets the first preset condition, the second core network device issues the EPLMN list; the first preset condition includes at least one of the following:

    The terminal device is located in a preset area;

    The terminal equipment is a terminal equipment supporting the fifth generation mobile communication technology 5G independent networking SA;

    The terminal equipment is a terminal equipment supporting a preset frequency;

    The terminal equipment is a terminal equipment supporting and opening a new air interface voice VONR voice service;

    The terminal equipment is a non-Internet of Things terminal equipment;

    The user permanent identifier SUPI number segment of the terminal device is the first preset SUPI number segment;

    The terminal device is a terminal device that has subscribed to share the core network service of the first PLMN network.
22. The method according to claim 20, wherein the terminal device accesses the first access network device according to the at least one PLMN ID, further comprising:

    The terminal device receives first priority indication information from the second access network device; the first priority indication information is used to indicate: the priority of the terminal device to access the first access network device level, which is higher than the priority of the terminal device to access the third access network device; the third access network device is an access network device with a preset network standard in the second PLMN network;

    When the area of the first access network device includes the first access network device and the third access network device, the terminal device accesses the first access network device.
23. The method according to any one of claims 18-22, wherein after the terminal device accesses the first access network device according to the at least one PLMN ID, the method further comprises:

    The terminal device receives a second EPLMN list from the first access network device; the second EPLMN list includes the PLMN ID of the second PLMN network;

    The terminal device performs cell selection or cell reselection according to the second EPLMN list.
24. The method according to claim 23, wherein the second EPLMN list is an EPLMN list issued by the terminal device when the terminal device meets a second preset condition;

    The second preset condition includes at least one of the following:

    The SUPI number segment of the terminal device is the second preset SUPI number segment;

    The home public land mobile network HPLMN of the terminal device is the PLMN of the second PLMN network;

    The terminal device is located in a preset Tracking Area Code TAC.
25. The method according to claim 23, further comprising:

    The terminal device receives second priority indication information from the first access network device; the second priority indication information is used to indicate: the priority of the terminal device to access the first access network device level, which is higher than the priority of the terminal device accessing the third access network device in the second PLMN network;

    When the coverage area of the first access network device includes the first access network device and the third access network device, the terminal device accesses the first access network device.
26. The method according to any one of claims 18-22, wherein the terminal device accessing the first access network device according to the at least one PLMN ID includes:

    The terminal device parses the first system message to determine the at least one PLMN ID;

    If there is a first PLMN ID in the terminal device, the terminal device accesses the first access network device according to the first PLMN ID; the first PLMN ID is the same as the first PLMN ID A PLMN ID identical to a PLMN ID in at least one of the system messages;

    In the case that the first PLMN ID does not exist in the terminal device, the terminal device searches for the signal of the second PLMN network, and after searching for the signal of the second PLMN network, accesses the second PLMN Network access network equipment;

    The terminal device receives the first EPLMN list from the access network device of the second PLMN network;

    Determine the first PLMN ID according to the first EPLMN list, and access the first access network device according to the first PLMN ID;

    If the terminal device does not search for the signal of the second PLMN network, the terminal device selects a PLMN ID from the at least one PLMN ID, and initiates an access to the first access network device according to the PLMI ID. enter;

    If the access is successful, then use the one PLMN ID as the first PLMN ID;

    If the access fails, another PLMN ID is selected to initiate access to the first access network device until the access is successful, and the PLMN ID when the access is successful is used as the first PLMN ID;

    After determining the first PLMN ID, the terminal device sends the first PLMN ID to the first access network device.
27. The method according to claim 26, wherein the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the SUPI of the terminal device , the HPLMN of the terminal device.
28. A communication method, characterized in that it is applied to a communication system, and the communication system includes: a terminal device, a first access network device, a first core network device, and a second core network device, and the method includes:

    The first core network device receives the home network information from the terminal device; wherein, the terminal device accesses the first core network device through the first access network device; the first access network device and the first The core network device belongs to the first public land mobile network PLMN network; the terminal device belongs to the second PLMN network; the first core network device communicates with the second core network device through a communication interface; the second The second core network device is a core network device in the second PLMN network; the home network information is used to indicate that the home network of the terminal device is the second PLMN network;

    The first core network device determines the second access network device in the second PLMN network according to the home network information;

    The first core network device receives service data from the terminal device;

    The first core network device forwards the service data to the second core network device.
29. The method according to claim 28, further comprising:

    The first core network device determines a second equivalent public land mobile network EPLMN list; the second EPLMN list includes the PLMN ID of the second PLMN network;

    The first core network device sends the second EPLMN list to the first access network device.
30. The method according to claim 28 or 29, wherein the home network information includes at least one of the following: the PLMN ID selected when the terminal device accesses the first access network device, the terminal The user permanent identifier SUPI of the device, and the home public land mobile network HPLMN of the terminal device.
31. The method according to claim 28 or 29, further comprising:

    The first core network device performs access control on the terminal device; the access control includes at least one of the following:

    When the SUPI number segment of the terminal device is the first preset SUPI number segment, allowing the terminal device to access;

    When the SUPI number segment of the terminal device is a second preset number segment, rejecting the access of the terminal device;

    When the SUPI number segment of the terminal device is the third preset number segment, and the capability of the terminal device does not include the preset capability, rejecting the access of the terminal device;

    When the first PLMN ID determined by the terminal device is a preset PLMN ID, and the SUPI of the terminal device is a preset SUPI, the terminal device is allowed to access.
32. The method according to claim 28 or 29, further comprising:

    The first core network device performs policy control on the terminal device; the policy control includes at least one of the following:

    Rejecting the first type of slice access of the terminal device; the first type of slice is a slice requested by the terminal device, or a preset issued by the second core network device to the first core network device type of slice;

    Mapping the first type of slice to a second type of slice, allowing access of the second type of slice;

    Rejecting the first type of QoS access of the terminal device; the first type of QoS is the QoS requested by the terminal device, or the preset issued by the second core network device to the terminal device type of QoS;

    Map the first type of QoS to the second type of QoS, and allow the second type of QoS to access.
33. The method according to claim 28 or 29, further comprising:

    When the first core network device forwards the service data to the second core network device, charges the terminal device according to the data traffic of the service data.
34. A communication device, characterized by comprising: a communication unit and a processing unit; wherein the communication unit is used to communicate with other communication devices; the processing unit is used to execute the method described in any one of claims 17-27. A communication method; or performing the communication method described in any one of claims 28-33.
35. A communication device, characterized by comprising: a processor and a memory; wherein the memory is used to store computer-executable instructions, and when the communication device is running, the processor executes the computer-executable instructions stored in the memory. instructions, so that the communication device executes the communication method described in any one of claims 17-27; or executes the communication method described in any one of claims 28-33.
36. A computer-readable storage medium, characterized in that the computer-readable storage medium includes instructions, and when executed, the instructions cause the computer to execute the communication method according to any one of claims 17-27; or Executing the communication method described in any one of claims 28-33.

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