CN116456319A - Communication system, method, apparatus and storage medium - Google Patents

Abstract

The invention discloses a communication system, a method, a device and a storage medium, relates to the field of communication, and solves the problem that a sharing operator cannot control and charge terminal equipment when sharing a network by multiple operators in the prior art. The method comprises the following steps: the terminal equipment is accessed to first core network equipment through first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the first core network device and the second core network device are communicated through a communication interface; the terminal equipment and the second core network equipment are core network equipment in a second PLMN network; the terminal equipment sends home network information to first core network equipment; and the terminal equipment sends the service data to the first core network equipment. The service data of the terminal equipment in the method is forwarded to the second access network equipment by the first access network equipment, so that the control and charging of the terminal equipment by the first access network equipment are realized.

Description

Communication system, method, apparatus and storage medium

Technical Field

The present invention relates to the field of communications, and in particular, to a communication system, a method, an apparatus, and a storage medium.

Background

In the related art, when a plurality of operators share a network, only access network devices are generally shared, and the shared access network devices are respectively connected with core network devices of the operators. The terminal equipment is accessed to core network equipment to which the terminal equipment belongs through shared access network equipment.

In the network sharing method, core network equipment of an operator constructing access network equipment cannot control and manage access control, policy control, network selection, charging settlement and the like of terminal equipment.

Disclosure of Invention

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

In order to achieve the above purpose, the invention adopts the following technical scheme:

in a first aspect, there is provided a communication system comprising: the terminal equipment, the first access network equipment, the first core network equipment and the second core network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment and the second core network equipment belong to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the terminal equipment is used for accessing the first core network equipment through the first access network equipment and sending home network information to the first core network equipment; the home network information is used for representing that the home network of the terminal equipment is a second PLMN network; the first core network device is configured to determine a second access network device in the second PLMN network according to the home network information; the terminal equipment is also used for sending service data to the first core network equipment; the first core network device is further configured to forward the service data to the second core network device after receiving the service data.

With reference to the first aspect, in one 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; a terminal device for accessing the first access network device according to at least one PL MN ID; the terminal equipment is also used for accessing the first core network equipment through the first access network equipment.

With reference to the first aspect, in one possible implementation manner, the at least one PLMN ID includes a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of a second PLMN network broadcasted by the second access network equipment; the second access network device is an access network device in a 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 broadcasted by the second access network device; or, the at least one PLMN ID includes a third PLMN ID; the third PLMNID is different from a PLMN ID of the second PLMN network broadcast by the second access network device.

With reference to the first aspect, in one possible implementation manner, the system further includes: a second access network device; the second core network device is further configured to determine a first EPLMN list, and send the first EPLMN list to the first access network device; the first EPLMN list includes one or more PLMN IDs of the at least one PLMN ID; the first access network equipment is used for receiving the first EPLMN list and sending the first EPLMN list to the terminal equipment; the terminal equipment is used for receiving the first EPLMN list; the terminal equipment is also used for analyzing the first system message and determining at least one PLMN ID in the first system message; in case one or more of the at least one PLMN ID is identical to a PLMN ID in the first EPLMN list, determining to access the first access network device.

With reference to the first aspect, in one possible implementation manner, when the first EPLMN list is that the terminal device meets a first preset condition, the second core network device is that the terminal device issues the EPLMN list; the first preset condition includes at least one of: the terminal equipment is located in a preset area; the terminal equipment is terminal equipment supporting 5G SA; the terminal equipment is terminal equipment supporting preset frequency; the terminal equipment is the terminal equipment supporting and starting the VONR voice service; the terminal equipment is non-internet of things terminal equipment; the SUPI number segment of the terminal equipment is a first preset SUPI number segment; the terminal device is a terminal device subscribed to a core network service sharing the first PLMN network.

With reference to the first aspect, in one possible implementation manner, 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 for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network;

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

With reference to the first aspect, in one possible implementation manner, the first core network device is further configured to determine a second EPL MN list, and send the second EPLMN list to the first access network device; the second EPLMN list includes PLMN IDs for the second PLM N 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 equipment is used for receiving the second EPLMN list and carrying out cell selection or cell reselection according to the second EPLMN list.

With reference to the first aspect, in one possible implementation manner, when the second EPLMN list is that the terminal device meets a second preset condition, the first core network device is that the terminal device issues the EPLMN list; the second preset condition includes at least one of: the SUPI number segment of the terminal equipment is a second preset SUPI number segment; the HPLMN of the terminal equipment is a PLMN of the second PLMN network; the terminal equipment is located in a preset TAC.

With reference to the first aspect, in one possible implementation manner, 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 for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment in the second PLMN network; and the terminal equipment is used for receiving the second priority indication information and accessing the first access network equipment when the coverage area of the first access network equipment comprises the first access network equipment and the third access network equipment.

With reference to the first aspect, in one possible implementation manner, the terminal device is specifically configured to: analyzing the first system message to determine at least one PLMN ID; accessing a first access network device according to a first PLMN ID under the condition that the first PLMN ID exists in the terminal device; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages; searching for a signal of a second PLMN network in case that the first PLMN ID does not exist in the terminal device, and accessing an access network device of the second PLMN network after searching for the signal of the second PLMN network; receiving a first EPLMN list from an access network device of a second PLMN network; determining a first PLMN ID according to the first EPLMN list, and accessing first access network equipment according to the first PLMN ID; if the terminal equipment does not search for the signal of the second PLMN network, selecting one PLMN ID from at least one PLMN ID, and initiating access to the first access network equipment according to the PLMI ID; if the access is successful, taking one PLMN ID as a first PLMN ID; if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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 first PLMN ID is sent to the first access network device.

With reference to the first aspect, in one 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.

With reference to the first aspect, in one possible implementation manner, the first core network device is further configured to: and receiving the first PLMN ID, and determining second core network equipment according to the first PLMN ID.

With reference to the first aspect, in one possible implementation manner, the home network information includes at least one of the following: a PLMN ID selected when the terminal equipment accesses the first access network equipment, SUPI of the terminal equipment, and HPLMN of the terminal equipment.

With reference to the first aspect, in one possible implementation manner, the first core network device is further configured to perform access control on the terminal device; the access control includes at least one of: allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment; under the condition that the SUPI number segment of the terminal equipment is a second preset number segment, rejecting the terminal equipment to access; rejecting the terminal equipment to access under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability; and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

With reference to the first aspect, in one possible implementation manner, the first core network device is further configured to perform policy control on the terminal device; policy control includes at least one of: rejecting the first type slice access of the terminal equipment; the first type of slice is a slice requested by the terminal equipment, or a slice of a preset type issued by the second core network equipment to the first core network equipment; mapping the first type of slice to a second type of slice, allowing the second type of slice to access; rejecting a first type of QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment; mapping the first type of QoS to a second type of QoS allows for QoS access of the second type.

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

In a second aspect, a communication method is provided, applied to a communication system, where the communication system includes: the method comprises the steps of: the terminal equipment is accessed to first core network equipment through first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; the terminal equipment sends home network information to first core network equipment; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network, so that the first core network equipment determines second access network equipment in the second PLMN network according to the home network information; the terminal equipment sends the service data to the first core network equipment, so that the first core network equipment forwards the service data to the second core network equipment after receiving the service data.

With reference to the second aspect, in one possible implementation manner, the accessing, by a terminal device, a first core network device includes: the terminal equipment receives a first system message from first access network equipment; the first access network device is an access network device in a first PLMN network; the first system message includes at least one PLMN ID; the terminal equipment accesses the first access network equipment according to at least one PLMN ID; the terminal equipment accesses the first core network equipment through the first access network equipment.

With reference to the second aspect, in one possible implementation manner, the at least one PLMN ID includes a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of a second PLMN network broadcasted by the second access network equipment; 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 broadcasted by the second access network device; or, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from a PLMN ID of the second PLMN network broadcast by the second access network device.

With reference to the second aspect, in one possible implementation manner, the accessing, by the terminal device, the first access network device according to at least one PLMN ID includes: the terminal equipment receives a first EPLMN list from the second access network equipment; the first EPLMN list includes one or more PLMN IDs of the at least one PLMN ID; in case one or more of the at least one PLMN ID is identical to a PLMN ID in the first EPLMN list, the terminal device determines to access the first access network device.

With reference to the second aspect, in one possible implementation manner, when the first EPLMN list is that the terminal device meets a first preset condition, the second core network device is that the terminal device issues the EPLMN list; the first preset condition includes at least one of: the terminal equipment is located in a preset area; the terminal equipment is terminal equipment supporting 5G SA; the terminal equipment is terminal equipment supporting preset frequency; the terminal equipment is the terminal equipment supporting and starting the VONR voice service; the terminal equipment is non-internet of things terminal equipment; the SUPI number segment of the terminal equipment is a first preset SUPI number segment; the terminal device is a terminal device subscribed to a core network service sharing the first PLMN network.

With reference to the second aspect, in one possible implementation manner, the terminal device accesses the first access network device according to at least one PLMN ID, and further includes: the terminal equipment receives first priority indication information from second access network equipment; the first priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network; and when the first access network equipment area comprises the first access network equipment and the third access network equipment, the terminal equipment accesses the first access network equipment.

With reference to the second aspect, 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 equipment receives a second EPLMN list from the first access network equipment; the second EPLMN list includes PLMN IDs of the second PLMN network; and the terminal equipment performs cell selection or cell reselection according to the second EPLMN list.

With reference to the second aspect, in one possible implementation manner, when the second EPLMN list is that the terminal device meets a second preset condition, the first core network device is that the terminal device issues the EPLMN list; the second preset condition includes at least one of: the SUPI number segment of the terminal equipment is a second preset SUPI number segment; the HPLMN of the terminal equipment is a PLMN of the second PLMN network; the terminal equipment is located in a preset TAC.

With reference to the second aspect, in one possible implementation manner, the method further includes: the terminal equipment receives second priority indication information from the first access network equipment; the second priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment in the second PLMN network; and when the coverage area of the first access network equipment comprises the first access network equipment and the third access network equipment, the terminal equipment accesses the first access network equipment.

With reference to the second aspect, in one possible implementation manner, the accessing, by the terminal device, the first access network device according to at least one PLMN ID includes: the terminal equipment analyzes the first system message and determines at least one PLMN ID; under the condition that a first PLMN ID exists in the terminal equipment, the terminal equipment accesses to first access network equipment according to the first PLMN ID; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages; under the condition that the first PLMN ID does not exist in the terminal equipment, the terminal equipment searches for a signal of a second PLMN network, and after the signal of the second PLMN network is searched, access network equipment of the second PLMN network is accessed; the terminal equipment receives a first EPLMN list from access network equipment of a second PLMN network;

determining a first PLMN ID according to the first EPLMN list, and accessing first access network equipment according to the first PLMN ID; if the terminal equipment does not search for the signal of the second PLMN network, the terminal equipment selects one PLMN ID from at least one PLMN ID and initiates access to the first access network equipment according to the PLMI ID; if the access is successful, taking one PLMN ID as a first PLMN ID; if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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.

With reference to the second aspect, in one possible implementation manner, the home network information includes at least one of the following: a PLMN ID selected when the terminal equipment accesses the first access network equipment, SUPI of the terminal equipment, and HPLMN of the terminal equipment.

In a third aspect, a communication method is provided, applied to a communication system, the communication system including: the method comprises the steps of: the first core network equipment receives home network information from the terminal equipment; the terminal equipment is accessed to the first core network equipment through the first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network; the first core network equipment determines second access network equipment in a second PLMN network according to the home network information; the method comprises the steps that first core network equipment receives service data from terminal equipment; the first core network device forwards the service data to the second core network device.

With reference to the third aspect, in one possible implementation manner, the method further includes: the first core network device determines a second EPLMN list; the second EPLMN list includes PLMN IDs of the second PLMN network; the first core network device sends a second EPLMN list to the first access network device.

With reference to the third aspect, in one possible implementation manner, the home network information includes at least one of the following: a PLMN ID selected when the terminal equipment accesses the first access network equipment, SUPI of the terminal equipment, and HPLMN of the terminal equipment.

With reference to the third aspect, in one possible implementation manner, the method further includes: the first core network equipment performs access control on the terminal equipment; the access control includes at least one of: allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment; under the condition that the SUPI number segment of the terminal equipment is a second preset number segment, rejecting the terminal equipment to access; rejecting the terminal equipment to access under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability; and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

With reference to the third aspect, in one possible implementation manner, the method further includes: the first core network device performs policy control on the terminal device; policy control includes at least one of: rejecting the first type slice access of the terminal equipment; the first type of slice is a slice requested by the terminal equipment, or a slice of a preset type issued by the second core network equipment to the first core network equipment; mapping the first type of slice to a second type of slice, allowing the second type of slice to access; rejecting a first type of QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment; mapping the first type of QoS to a second type of QoS allows for QoS access of the second type.

With reference to the third aspect, in one possible implementation manner, the method further includes: when the first core network equipment forwards service data to the second core network equipment, the first core network equipment charges the terminal equipment according to the data flow of the service data.

In a fourth aspect, a communication apparatus is provided, including: a communication unit and a processing unit; the processing unit is used for indicating the communication unit to access the first core network equipment through the first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; the processing unit is used for indicating the communication unit to send the home network information to the first core network equipment; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network; and the processing unit is used for indicating the communication unit to send the service data to the first core network equipment.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: instruct the communication unit to receive a first system message from the first access network device; the first access network device is an access network device in a first PLMN network; the first system message comprises at least one PLMN ID which is accessed to the first access network equipment according to the at least one PLMN ID; and accessing the first core network equipment through the first access network equipment.

With reference to the fourth aspect, in one possible implementation manner, the at least one PLMN ID includes a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of a second PLMN network broadcasted by the second access network equipment; 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 broadcasted by the second access network device; or, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from a PLM N ID of the second PLMN network broadcast by the second access network device.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: instruct the communication unit to receive a first EPLMN list from the second access network device; the first EPLMN list includes one or more PLMN IDs of the at least one PLMN ID; in case one or more of the at least one PLMN ID is identical to a PLMN ID in the first EPLMN list, determining to access the first access network device.

With reference to the fourth aspect, in one possible implementation manner, when the first EPLMN list is that the terminal device meets a first preset condition, the second core network device is that the terminal device issues the EPLMN list; the first preset condition includes at least one of: the terminal equipment is located in a preset area; the terminal equipment is terminal equipment supporting 5G SA; the terminal equipment is terminal equipment supporting preset frequency; the terminal equipment is the terminal equipment supporting and starting the VONR voice service; the terminal equipment is non-internet of things terminal equipment; the SUPI number segment of the terminal equipment is a first preset SUPI number segment; the terminal device is a terminal device subscribed to a core network service sharing the first PLMN network.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: the method comprises the steps that a communication unit is instructed to receive first priority indication information from second access network equipment; the first priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network; and when the first access network equipment area comprises the first access network equipment and the third access network equipment, the communication unit is instructed to access the first access network equipment.

With reference to the fourth aspect, in a possible implementation manner, the processing unit is further configured to: instruct the communication unit to receive a second EPLMN list from the first access network device; the second EPLMN list includes PLMN IDs of the second PLMN network; and selecting the cell or reselecting the cell according to the second EPLMN list.

With reference to the fourth aspect, in one possible implementation manner, when the second EPLMN list is that the terminal device meets a second preset condition, the first core network device is that the terminal device issues the EPLMN list; the second preset condition includes at least one of: the SUPI number segment of the terminal equipment is a second preset SUPI number segment; the HPLMN of the terminal equipment is a PLMN of the second PLMN network; the terminal equipment is located in a preset TAC.

With reference to the fourth aspect, in a possible implementation manner, the processing unit is further configured to: second priority indication information indicating that the communication unit is from the first access network device; the second priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment in the second PLMN network; and when the coverage area of the first access network equipment comprises the first access network equipment and the third access network equipment, the communication unit is instructed to access the first access network equipment.

With reference to the fourth aspect, in one possible implementation manner, the processing unit is specifically configured to: the terminal equipment analyzes the first system message and determines at least one PLMN ID; under the condition that a first PLMN ID exists in the terminal equipment, the communication unit is instructed to access first access network equipment according to the first PLMN ID; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages; searching for a signal of a second PLMN network in case that the first PLMN ID does not exist in the terminal device, and accessing an access network device of the second PLMN network after searching for the signal of the second PLMN network; instructing the communication unit to receive a first EPLMN list from an access network device of the second PLMN network; determining a first PLMN ID according to the first EPLMN list, and accessing first access network equipment according to the first PLMN ID; if the terminal equipment does not search for the signal of the second PLMN network, selecting one PLMN ID from at least one PLMN ID, and initiating access to the first access network equipment according to the PLMI ID; if the access is successful, taking one PLMN ID as a first PLMN ID; if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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 communication unit is instructed to send the first PLMN ID to the first access network device.

With reference to the fourth aspect, in one possible implementation manner, the home network information includes at least one of the following: a PLMN ID selected when the terminal equipment accesses the first access network equipment, SUPI of the terminal equipment, and HPLMN of the terminal equipment.

In a fifth aspect, a communication apparatus is provided, including: a communication unit and a processing unit; a processing unit, configured to instruct the communication unit to receive home network information from the terminal device; the terminal equipment is accessed to the first core network equipment through the first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network; the processing unit is further used for determining second access network equipment in a second PLMN network according to the home network information; the processing unit is also used for indicating the communication unit to receive the service data from the terminal equipment; and the processing unit is also used for indicating the communication unit to forward the service data to the second core network equipment.

With reference to the fifth aspect, in one possible implementation manner, the processing unit is specifically configured to: determining a second EPLMN list; the second EPLMN list includes PLMN IDs of the second PLMN network; the communication unit is instructed to send the second EPLMN list to the first access network device.

With reference to the fifth aspect, in one possible implementation manner, the home network information includes at least one of the following: a PLMN ID selected when the terminal equipment accesses the first access network equipment, SUPI of the terminal equipment, and HPLMN of the terminal equipment.

With reference to the fifth aspect, 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: allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment; under the condition that the SUPI number segment of the terminal equipment is a second preset number segment, rejecting the terminal equipment to access; rejecting the terminal equipment to access under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability; and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

With reference to the fifth aspect, in a possible implementation manner, the processing unit is further configured to perform policy control on the terminal device; policy control includes at least one of: rejecting the first type slice access of the terminal equipment; the first type of slice is a slice requested by the terminal equipment, or a slice of a preset type issued by the second core network equipment to the first core network equipment; mapping the first type of slice to a second type of slice, allowing the second type of slice to access; rejecting a first type of QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment; mapping the first type of QoS to a second type of QoS allows for QoS access of the second type.

With reference to the fifth aspect, in a possible implementation manner, the processing unit is further configured to charge the terminal device according to a 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 comprising: a processor and a communication interface; the communication interface is coupled to a processor for running a computer program or instructions to implement the communication method as described in any one of the possible implementations of the first aspect and the first aspect.

In a seventh aspect, the present application provides a communication apparatus comprising: a processor and a communication interface; the communication interface is coupled to a processor for running a computer program or instructions to implement the communication method as described in any one of the possible implementations of the second aspect and the second aspect.

In an eighth aspect, the present application provides a computer readable storage medium having instructions stored therein which, when executed by a processor of a communication device, enable the communication device to perform a communication method as described in any one of the possible implementations of the first aspect and the first aspect.

In a ninth aspect, the present application provides a computer readable storage medium having instructions stored therein which, when executed by a processor of a communication device, enable the communication device to perform a communication method as described in any one of the possible implementations of the second aspect and the second aspect.

In the present application, the names of the above-mentioned communication apparatuses do not constitute limitations on the devices or function modules themselves, and in actual implementations, these devices or function modules may appear under other names. Insofar as the function of each device or function module is similar to that of the present invention, it falls within the scope of the claims of the present invention and the equivalents thereof.

These and other aspects of the invention will be more readily apparent from the following description.

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

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

Thus, when the terminal equipment provides network service through the shared network, the core network equipment of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal equipment. The method solves the problem that the current shared network cannot control terminal equipment of other operators.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a system architecture diagram of a MOCN system provided herein;

fig. 2 is a system architecture diagram of a communication system provided in the present application;

FIG. 3 is a system architecture diagram of yet another communication system provided herein;

FIG. 4 is a schematic flow chart of a communication method provided in the present application;

FIG. 5 is a flow chart of another communication method provided in the present application;

FIG. 6 is a flow chart of another communication method provided in the present application;

fig. 7 is a schematic structural diagram of a communication device provided in the present application;

fig. 8 is a schematic structural diagram of another communication device provided in the present application.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

The terms referred to in this application are explained first as follows:

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

Currently, with the development of the fifth generation mobile communication technology (5th generation mobile communication technology,5G) network, network coverage is denser, the number of base stations is also increasing, and the networking cost of operators is also increasing. In order to reduce the network construction cost, a network sharing method is currently proposed, in which multiple operators share the same network, so that repeated construction of a communication network is reduced, the overall investment of the network is saved, and huge cost faced by network construction is relieved.

The shared network architecture supporting 5G MOCN is specified in the 3gpp r16 protocol specification. In this network architecture, supporting terminal devices to share 5G access networks (RANs) of different operators, the network architecture of the MOCN is shown in fig. 1.

As shown in fig. 1, in the MOCN system 10, a core network device 101 of an operator a, a core network device 102 of an operator B, a core network device 103 of an operator C, a core network device 104 of an operator X (denoted as a first core network device), and an access network device 105 of an operator X (denoted as a first access network device) are included.

The access network device 105 of the operator X is connected to the core network device 101 of the operator a, the core network device 102 of the operator B, and the core network device 103 of the operator C through N2 and N3 interfaces, respectively.

The access network device 105 of the operator X is used for accessing the terminal devices of the operators a, B and C, and forwarding the data of the terminal devices to the core network devices of the corresponding operators.

In the MOCN system 10, only the operator X builds an access network, and terminal devices of other operators are within the coverage of the access network device 105 of the operator X, and can access corresponding core network devices through the access network device 105 of the access operator X, so as to complete communication service for the terminal devices.

2. The manner in which access network devices broadcast public land mobile network (public land mobile network, PLMN) Identities (IDs) in the shared network systems of current MOCNs.

In the current MOCN system, the first access network device carries in a broadcast system message PLMN IDs of core networks of respective operators sharing the access network device.

For example, in the case where the operator a and the operator X share the access network in a MOCN manner, the first access network device carries PLMN IDs of the operator a and the operator X in the broadcast system information, respectively. Each PLMN ID corresponds to a core network of an operator.

After receiving the broadcasted system message, the terminal device analyzes the system message and determines the PLMN ID carried in the system message. And the terminal equipment determines a core network connected with the first access network equipment according to the PLMN ID, and selects the PLMN ID of the network to which the terminal equipment belongs. The terminal device informs 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.

In connection with fig. 1, in an example, in a case where the operator X, the operator a, the operator B, and the operator C share the access network of the operator X, the PLMN selection (or reselection) procedure of the terminal equipment of the operator X, the operator a, the operator B, and the operator C is as follows in table 1:

In table 1 and MOCN sharing mode, PLMN IDs carried in system messages broadcast by the first access network device, PLMN selection and message routing of terminal devices of each operator are shared:

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it should be noted that, in practical application, the first access network device of the operator X carries, in addition to the core network identifier PLMN-ID (a) of the operator a, the core network identifier PLMN-ID (B) of the operator B, and the core network identifier PLMN-ID (C) of the operator C in the broadcasted system message, the core network identifier PLMN-ID (X) of the operator X. Since the first access network device of the operator X carries the PLMN-ID (X) in the broadcasted system message, the broadcast mode belongs to the conventional broadcast mode, and not the broadcast mode of the shared network. Therefore, the case of network sharing due to the terminal device of operator X is not shown in fig. 1 and table 1.

In an example, in a case where the operator a and the operator X share the network in a MOCN manner, the access network constructed by the operator a carries the PLMN ID of the operator B in a broadcasted system message, so that the terminal device of the operator B accesses to the access network of the operator a; meanwhile, the system message also carries the PLMN ID of the operator A so that the terminal equipment of the operator A can also access the access network of the operator A.

Similarly, the access network built by the operator X carries the PLMN ID of the operator A in the broadcasted system message, so that the terminal equipment of the operator A is accessed into the access network of the operator X; meanwhile, the system message also carries the PLMN ID of the operator X, so that the terminal equipment of the operator X can also access the access network of the operator X.

In the MOCN sharing mode, the terminal device needs to select the core network according to the PLMN ID broadcasted by the first access network device. Thus, the number of PLMN IDs broadcasted by the first access network device needs to be the same as the number of 5G core networks sharing the access network. Thus, the first access network device must broadcast a plurality of PLMN IDs in order for all terminal devices to be able to access the access network.

In the case of N operators sharing 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 sharing access network is the same as the PLMNID of each sharing operator. In this way, the time delay of the terminal device when selecting the PLMN is the shortest (the specific time delay is determined according to the selection sequence of the PLMN IDs of the terminal device), and the network selecting residence time of the terminal device is the shortest. Especially when the terminal equipment is started up or the terminal equipment recovers from the uncovered cell and the terminal equipment in idle state performs cell reselection, the time delay required for selecting PLMN and selecting network residence is shortest.

The adoption of the MOCN shared access network includes at least the following advantages: under the framework of the sharing access network of the MOCN, the core networks of different operators are completely and independently arranged, and 5G special services such as network slicing, edge computing and the like are better supported.

The terms related to the embodiments of the present application are explained above.

However, in the network configuration method of the MOCN shared access network, since the terminal device directly accesses to the core network device of the home operator of the terminal device through the first access network device, the terminal device is not registered with the core network (e.g., 5G core network (5G core network,5GC)) of the operator X, and the service data of the terminal device is not forwarded through the core network device of the operator X.

In order to solve the technical problem, the application provides a communication system, which enables a plurality of operators to share an access network and a core network at the same time. The terminal equipment is accessed into the core network of the contractor through the access network of the contractor, when the terminal equipment needs to carry out service transmission, the core network equipment of the contractor transmits the service data of the terminal equipment to the core network of the home operator of the terminal equipment, and the core network equipment of the home operator processes the service data of the terminal equipment.

Based on the above, in the present application, since the service data of the terminal device is forwarded to the core network device of the home network by the core network device of the contractor, the core network device of the contractor can implement access control, policy control, network selection, and charging settlement for the terminal device through the network element in the core network.

Fig. 2 is a communication system 20 provided in an embodiment of the present application, as shown in fig. 2, where the communication system provided in 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 device 203, a terminal device 204.

The first access network device 201 is configured to implement a function of a radio access network, and provide a radio access service for a terminal device. The first access network device 201 is an access network device of the contractor operator. Such as an access network device of operator X.

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

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

The first core network device 202 for the terminal device of the shared operator is configured to provide a data routing function for routing the terminal device service data into 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 billing settlement for the terminal device.

The second core network device 203 is a core network device of a sharing operator, and is used for implementing a core network related function by a terminal device of the sharing operator. For example, providing data processing or forwarding functions.

In fig. 2, the explanation is given taking, as an example, that at least one second core network device 203 includes a core network device 2031 of the operator a, a core network device 2032 of the operator B, and a core network device 2033 of the operator C.

The core network device 2031 of the operator a is configured to provide core network related service for a terminal device of the operator a; the core network device 2032 of the operator B is configured to provide core network related service for a terminal device of the operator B; the core network device 2033 of the operator C is configured to provide core network related service for a terminal device of the operator C.

The terminal device 204 is a device that needs to provide a communication service, and may be a terminal device that belongs to one operator together with the first access network device 201 and the first core network device 202. The terminal device 204 may also be a terminal device belonging to one operator with any one of the at least one second core network device 203. The present application mainly describes an example in which a terminal device is a terminal device belonging to one operator together with any one second core network device 203 of at least one second core network device 203.

Each of the devices in the communication system 20 shown in fig. 2 is briefly described above.

It should be noted that, in the communication system shown in fig. 2, the terminal device and the core network device of the access network device all need to execute corresponding action processes and implement corresponding functions, so as to implement the functions of access control, policy control, network selection and charging settlement of the core network device of the contractor on the terminal device.

Specifically, the method comprises the following steps: scene 1, a process of broadcasting PLMN ID by first access network equipment; scene 2, a process of selecting PLMN ID by the terminal equipment; scene 3, the second access network device and the second core network device send PLMN ID auxiliary parameters to the terminal device; scene 4, the first access network device and the second access network device send down a process of selecting auxiliary parameters for the network for the terminal device; and 5, performing access control, policy control, network selection and charging settlement on the terminal equipment by the second core network equipment.

Hereinafter, description will be made of each of:

scenario 1, procedure of the first access network device broadcasting PLMN ID.

In order for the first access network device 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 a PLMN ID to the terminal device, where the first access network device may use any one of the following schemes 1 to 3 to broadcast the PLMN ID when broadcasting the PLMN ID. Scheme 1, scheme 2, and scheme 3 are described below, respectively:

scheme 1, the first access network device broadcasts, for each core network connected to the first access network device, a PLMN ID native to the core network. The PLMN ID of each core network is the same as the PLMN ID broadcast for that core network within the home network of the operator to which it belongs. That is, in scheme 1, the first access network device broadcasts the PLMN ID of each core network in a manner similar to the manner in which the MOCN broadcasts the PLMN ID in the related art.

In an example, in connection with fig. 2, the first access network device of operator X broadcasts a PLMN ID (a) for the core network of operator a, a PLMN ID (B) for the core network of operator B, and a PLMN ID (C) for the core network of operator C, respectively.

Broadcasting PLMN IDs using scheme 1 brings at least the following benefits: when the terminal device acquires the PLMN ID, the delay required to select the PLMN (e.g., when the terminal device is powered on or off when recovering from an uncovered area) is minimal. In addition, in the scheme 1, the first access network device broadcasts the PLMN ID of each core network in a manner of broadcasting the PLMN ID by the MOCN in the related art, without creating a new network number, and without wasting network number resources.

In scheme 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 can be supported by the first access network device, and N is a positive integer.

Scheme 2, first access network device broadcasts a new PLMN ID for each core network connected to the first access network device. The new PLMN ID for each core network is not the same as the PLMN ID broadcast for that core network within the home network of the operator to which it belongs. For example, the first access network device may combine the PLMN ID of the carrier operator with the PLMN ID of the shared operator to obtain a PLMN ID of each core network.

In connection with fig. 2, the first access network device of operator X, when broadcasting a PLMN ID, broadcasts a PLMN ID (XA) for the core network of operator a, a PLMN ID (XB) for the core network of operator B, and a PLMN ID (XC) for the core network of operator C, respectively.

Broadcasting PLMN IDs using scheme 2 brings at least the following benefits: the first access network device may customize the broadcast of the new PLMN ID. Thus, after receiving the new PLMN ID, the terminal device can determine, according to the new PLMN ID, an access network which can be shared and is configured by the access network for the operator X. In addition, the terminal device can display the network identifier of the carrier and the network identifier of the sharing carrier on the display interface according to the new PLMN ID.

In scheme 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.

Scheme 3, the first access network device broadcasts one same PLMN ID for each core network connected to the first access network device.

In connection with fig. 2, the first access network device only broadcasts PLMN IDs of the core network of operator X. Alternatively, the first access network device only broadcasts a new PLMN ID (XY) of the core network of operator X.

Broadcasting PLMN IDs using scheme 3 brings at least the following benefits: the first access network device only needs to broadcast one PLMN ID, so that signaling overhead of the first access network device is reduced. When the first access network equipment only broadcasts the PLMN ID of the core network of the operator X, the waste of network number resources is not caused. In the scheme 3, since the first access network device does not broadcast PLMN IDs of the respective operators, in the scheme 3, it is necessary to add a function that the first core network device can determine the home network of the terminal device without depending on the PLMN ID selected by the terminal device. For example, the functionality of the SUPI or HPLMN of the first core network device identification terminal device is extended. Correspondingly, the terminal equipment also needs to have a function of reporting the SUPI or the HPLMN.

An example, in combination with the above schemes 1, 2, and 3 and fig. 2, the manner in which the PLMN ID is broadcast by the first access network device of operator X is shown in table 2 below:

table 2, manner in which the first access network device of operator X broadcasts PLMN IDs

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

Scene 2, a procedure of selecting PLMN ID by the terminal equipment.

When the terminal equipment accesses the first access network equipment, whether the PLMN ID supported by the terminal equipment exists in the PLMN ID broadcasted by the first access network equipment or not needs to be determined according to the PLMN network supported by the terminal equipment and the PLMN ID broadcasted by the first access network equipment.

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 a PLMN ID corresponding to the home network of the terminal device from the first system message (when broadcast in scheme 3, the terminal device may 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 equipment forwards service data of the terminal equipment to core network equipment to which the terminal equipment belongs; or the first core network device forwards 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 equipment, or when forwarding the core network service subscribed by the terminal equipment, the first core network equipment performs access control, policy control, network selection and charging settlement on the terminal equipment.

In connection with table 2, the following table 3 illustrates the terminal device selection PLMN ID of the operator a, taking the terminal device selection PLMN ID as an example:

table 3 terminal device selection PLMN ID for operator a

As can be seen from the procedure of selecting a PLMN by the terminal equipment of the operator a corresponding to the schemes 2 and 3 in table 3, in the above schemes 2 and 3, since the search priority of the PLMN ID (for example, PLMN-ID (XA), PLMN-ID (XY)) broadcasted by the terminal equipment is lower than the RPLMN, HPLMN, and EHPLMN in the terminal equipment. Therefore, the terminal equipment can select to reside in the first access network equipment only when no home network signal coverage exists in the coverage area of the first access network equipment in the process of searching the network and selecting the PLMN.

If the operator a does not have 5G signal coverage in the coverage area of the first access network, but has fourth generation mobile communication technology (4th generation mobile communication technology,4G) signal coverage, then when the terminal device of the operator a selects the network, since the PLMN ID broadcast by the operator a includes the HPLMN of the terminal device, and the PLMN ID broadcast by the first access network device includes no HPLMN of the terminal device. This will result in the terminal device preferentially selecting to camp on the 4G cell of operator a. And further, the terminal equipment cannot reside in the 5G cell which is provided by the operator X and can be shared, and 5G network sharing cannot be realized between the operator A and the operator X.

In order for the terminal device to be able 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 assistance parameter selection for the terminal device. The following is a detailed description in connection with scenario 3:

and 3, the second access network equipment and the second core network equipment send PLMN ID auxiliary parameters to the terminal equipment.

The terminal equipment initiates registration to the second access network equipment in the network of the home operator and registers to the second access network equipment. And the second access network equipment and the second core network equipment send PLMN ID auxiliary parameters to the terminal equipment.

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

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

The first priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment. The third access network device is access network device of a preset network system in the second PLMN network. An example, the preset network system is a 4G network system.

In particular, the second core network device may issue the first EPLMN list for the terminal device at least according to any of the following manners 1-5:

in mode 1, the second core network device issues a first EPLMN list for the terminal device according to a tracking area identification code (Tracking Area identity, TAI) of the terminal device, where the first EPLMN list is included in the first EPLMN list. For example, the second core network only issues the first EPLMN list in a border area or overlapping area of the second access network device and the first access network device.

And 2, the second core network equipment transmits a first EPLMN list to the terminal equipment according to the reporting capability of the terminal equipment.

The method specifically comprises the following steps: and 2.1, the second core network equipment transmits a first EPLMN list to the terminal equipment under the condition that the terminal equipment supports 5G SA. In general, the second core network device may be an MME in mode 2.1.

And 2.2, the second core network equipment issues a first EPLMN list for the terminal equipment under the condition that the frequency supported by the terminal equipment is the same as the frequency of the shared access network. For example, the frequency of the first access network device is 700Mhz, and at this time, the second core network device issues the first EPLMN list to the terminal device only supporting 700 Mhz.

And 2.3, the second core network equipment transmits a first EPLMN list to the terminal equipment under the condition that the terminal equipment supports VONR voice and starts a VONR function. For example, in the case that the operator X only shares the 5G access network (NG-RAN) and the 5GC, and does not share the LTE and EPC, the terminal device must use the VONR mode to normally perform the voice service in the area covered by the first access network device alone. At this time. The second core network device only issues the first EPLMN list to terminals supporting new air interface voice (Voice over New Radio, VONR) and opening the VONR switch, and does not issue the first EPLMN list to terminal devices supporting only EPS FALL BACK.

And 2.4, the second core network equipment transmits a first EPLMN list to the terminal equipment under the condition that the terminal equipment is a non-internet-of-things terminal.

And in the mode 3, the second core network equipment transmits a first EPLMN list to the terminal equipment according to a user permanent identifier (SUbscription Permanent Identifier, SUPI) number segment of the terminal equipment (SUPI is IMSI in 3GPP access).

And 4, the second core network device issues a first EPLMN list for the terminal device under the condition that the terminal device signs up for the core network sharing service.

And 5, the second core network equipment determines whether to issue a first EPLMN list for the terminal equipment according to one or more conditions of TAI of the terminal equipment, reporting capability, SUPI number segment and whether core network sharing service is signed.

For example, in the mode 5.1, the second core network device issues the first EPLMN list for the terminal device when the SUPI number segment of the terminal device belongs to the preset number segment, the frequency supported by the terminal device is the same as the frequency of the shared access network, the terminal device supports VONR voice and starts the VONR function, the terminal device signs up for the core network shared service, and the terminal device is in the preset tracking area code (tracking area code, TAC).

And 5.2, the second core network device issues a first EPLMN list for the terminal device under the conditions that the SUPI number segment of the terminal device belongs to a preset number segment, the frequency supported by the terminal device is the same as the frequency of the shared access network, the terminal device signs up for the core network shared service, and the terminal device is in a preset TAC.

And 5.3, the second core network device issues a first EPLMN list for the terminal device under the conditions that the frequency supported by the terminal device is the same as the frequency of the shared access network, the terminal device signs up for the core network shared service and the terminal device is in a preset TAC.

It can be understood that, in the network searching process of the terminal device, the search priority of each type of PLMN is as follows: RPLMN > EPLMN > HPLMN and EHPLMN > VPLMN. Therefore, in the 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 be EPLMN, so that the network searching priority of the first PLMN network corresponding to the first access network device is improved. In this way, when the terminal equipment moves to the coverage area of the first access network equipment, the terminal equipment can be preferentially accessed into the first access network equipment and the first core network equipment.

Furthermore, the second access network device may issue the first priority indication information for the terminal device at least according to the following manner 6:

and 6, the second access network equipment transmits first priority indication information to the terminal equipment according to the cell position information.

In one 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, the second access network device sets the cell frequency priority to: f2> F3> F1. In this way, the terminal device can access the 5G network (including the access network and the core network) of the home network preferentially, then 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.

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

The above description has been made of the procedure in which the second access network device and the second core network device issue PLMN ID assistance parameters to the terminal device.

It should be noted that, after the terminal device resides in the first access network device according to the PLMN ID auxiliary parameter, if the first access network device broadcasts the PLMN ID in the manner of the foregoing schemes 2 and 3, the terminal device will also search for the HPLMN and the EHPLMN periodically. When searching for signals of any HPLMN and EHPLMN, the terminal device will select to the cells of the HPLMN and EHPLMN by 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 of the third aspect, it can be known that the access network device and the core network device in the 4G network of the home network notify the terminal device of accessing to the first access network device through the auxiliary parameter, and at this time, the terminal device performs ping-pong network selection between the access network device and the first access network device of the 4G cell of the home network, so that the terminal device cannot normally reside and use services.

In order to solve the technical problem, the first access network device and the first core network device need to issue network selection auxiliary parameters to the terminal device so as to ensure that the terminal device can reside in the first access network device and the first core network device. The following is a detailed description in connection with scenario 4:

scene 4, the first access network device and the second access network device send down a process of selecting auxiliary parameters for the network for the terminal device.

Wherein the network selection assistance parameter is used to assist the terminal device in enabling the terminal device to stably camp on the second access network device after camping on the second access network device.

The network selection assistance parameters include at least one of: the second EPLMN list, the second priority indication information.

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

The second priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment. The third access network device is access network device of a preset network system in the second PLMN network. An example, the preset network system is a 4G network system.

In particular, the second core network device may issue the second EPLMN list for the terminal device at least according to any one of the following ways a and b:

and the first core network equipment transmits a second EPLMN list to the terminal equipment according to the SUPI number segment or the HPLMN of the terminal equipment in the mode a.

And the first core network equipment issues a second EPLMN list for the terminal equipment according to the TAC of the terminal equipment, the SUPI number segment of the terminal equipment or the HPLMN.

Furthermore, the second access network device may issue the second priority indication information for the terminal device at least according to the following manner c:

and c, the first access network equipment transmits second priority indication information to the terminal equipment according to the HPLMN of the terminal equipment.

In 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 to: f2> F3> F1. In this way, the terminal device can be made to access the 5G network (including the access network and the core network) of the home network preferentially, then 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 issues a second EPLMN list for the terminal device, and sets the HPLMN of the terminal device to be the EPLMN, so that the terminal device determines, according to the first EPLMN list and the second EPLMN list, that the PLMN selected by the current terminal device and the HPLMN of the terminal device are both PLMNs in the EPLMN list, where the selection priorities of the PLMN selected by the terminal device and the HPLMN of the terminal device are the same, and the terminal device will not perform a selection and reselection process according to the HPLMN of the terminal device. The first access network device also issues, for the terminal device, indication information indicating that the first access network device prioritizes the cell frequency over the home network 4G cell priority.

In this way, the terminal device will not search for the HPLMN or EHPLMN after camping on the first access network device for cell selection and cell reselection. And preferentially accessing the first access network device in a scene with both the first access device coverage and the third access network device coverage.

And 5, performing access control, policy control, network selection and charging settlement on the terminal equipment by the second core network equipment.

Mode a, the first core network device supports access control to the terminal device, including but not limited to:

1) And configuring the terminal equipment which allows the first preset SUPI number section to be accessed.

2) And configuring terminal equipment which does not allow the second preset SUPI number segment to be accessed.

3) And configuring the terminal equipment which does not meet the preset capacity requirement in the third preset SUPI number segment and does not allow the terminal equipment to be accessed. For example, for the terminal device of the operator a, in the case where the terminal device does not support the VONR capability, the configuration does not allow the terminal device to access.

4) And configuring the terminal equipment which allows the fourth preset SUPI number section to select the preset PLMN ID to be accessed.

Mode B, the first core network device supports policy control for the terminal device, including but not limited to:

1) And rejecting access to the slice requested by the terminal equipment or the slice issued by the second core network equipment.

2) The slice requested by the terminal equipment or the slice issued by the second core network equipment is mapped to other slices.

3) The requested quality of service (Quality of Service, qoS) for the terminal device, or the QoS issued by the second core network device, denies access.

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

1) And the first core network equipment determines a core network (second core network) subscribed by the terminal equipment according to the PLMN ID selected when the terminal equipment is accessed to the first access network equipment. 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 adopts the scheme 2 to broadcast the PLMN ID, the first core network device may use the PLMN ID selected by the terminal device as a parameter of network selection.

For example, in connection with fig. 2, the first core network device routes signaling and data of the terminal device into the core network device of operator a in case the terminal device accesses the first access network device as selected as PLMN ID (a).

2) The first core network device determines a core network (second core network) subscribed by the terminal device 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 broadcasts the PLMN ID in the above manner 3, 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 manner 2, the first core network device may use the HPLMN of the terminal device or the SUPI of the terminal device as a network selection parameter.

For example, in connection with fig. 2, the first core network device routes signaling and data of the terminal device into the core network device of operator a when the HPLMN of the terminal device is PLMN ID (a).

3) And the first core network equipment jointly determines a core network (second core network) subscribed by the terminal equipment according to the PLMN ID selected when the terminal equipment is accessed to the first access network equipment and the HPLMN (or SUPI number segment) of the terminal equipment. 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 in the above manner 1, the first core network device needs to use 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 together as parameters of network selection.

For example, in connection with fig. 2, the first core network device routes signaling and data of the terminal device into the core network device of operator a when the HPLMN of the terminal device is PLMN ID (a) and the HPLMN of the terminal device is PLMN ID (a).

And D, a charging and settling function of the first core network equipment.

In the present application, since the service data interacted by the terminal device and the second core network device are all routed and forwarded by the first core network device in the first core network. The first core network device may therefore charge the terminal device based on 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 the service data transmitted by the terminal device, and send the charging rule to the second core network device. The first core network device and the second core network device charge the terminal device together according to the same rule, so as to realize the inter-network settlement between different operators (namely, the settlement between other operators and the shared operator X when the access network of the shared operator X and the terminal device of other operators of the core network are used).

The above details about the corresponding action processes and the functions to be implemented for the first access network device, the terminal device, the first core network device, the second access network device and the second core network device according to the embodiments of the present application are described in detail below:

the following further details the communication system according to the embodiments of the present application:

as shown in fig. 3, a schematic structural diagram of a communication system 30 according to an embodiment of the present application is shown in fig. 3, where the communication system 30 includes: a terminal device 301, a first access network device 302, a first core network device 303, and at least one second core network device 304.

First access network device 302 the first core network device 303 belongs to the first PLMN network; the terminal device 301 and the second core network device 304 belong to a second PLMN network; the first core network device 303 and the second core network device 304 communicate with each other via a communication interface.

The terminal device 301 is configured 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 characterize the home network of the terminal device 301 as the second PLMN network.

The first core network device 303 is configured to determine a 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 scheme at least brings the following beneficial effects: in the communication system provided in the embodiment of the present application, a communication interface is opened between a first core network device and a second core network device, through which the first core network device may route service data of a terminal device of the same PLMN network as the second core network device into the second core network device, and the second core network device processes the service data of the terminal device.

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

Thus, when the terminal equipment provides network service through the shared network, the core network equipment of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal equipment. The method solves the problem that the current shared network cannot control terminal equipment of other operators.

As a possible implementation, 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.

A terminal device 301 for accessing a 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 scheme at least brings the following beneficial effects: the first access network device broadcasts a PLMN ID to the terminal device. In this way, after receiving the PLMN ID, the terminal device may determine whether the first access network device may be accessed according to the PLMN ID configured by the terminal device and the PLMN ID broadcasted by the first access network device.

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

or, 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 305.

The scheme at least brings the following beneficial effects: the application provides methods for broadcasting PLMN IDs by various first access network devices. The first access network device may directly broadcast PLMN IDs of all PLMN networks sharing 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 to 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 implement customization of the PLMN IDs. Or, 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 the HPLMN ID or the SUPI thereof, so that the signaling overhead of broadcasting the PLMN ID by the terminal device can be reduced.

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

The second core network device 304 is further configured to determine a 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 of the 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 the 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; in case one or more of the at least one PLMN ID is identical to a PLMN ID in the first EPLMN list, an access to the first access network device 302 is determined.

The scheme at least brings the following beneficial effects: and the second core network equipment transmits a corresponding EPLMN list to the terminal equipment according to the mode that the first access network equipment broadcasts the PLMN ID. All or part of PLMN IDs in the PLMN IDs broadcast by the first access network device are included in the EPLMN list. In this way, after the terminal device moves to the area covered by the first access network device, the PLMN ID may be selected from the first system message according to the EPLMN list, and accessed to the first access network device according to the PLMN ID. The problem that the terminal equipment cannot access the first access network equipment is avoided.

As a possible implementation manner, when the first EPLMN list is that the terminal device 301 meets the first preset condition, the second core network device 304 is that the terminal device 301 issues the EPLMN list; the first preset condition includes at least one of:

the terminal equipment is located in a preset area.

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

The terminal device is a terminal device 301 supporting a preset frequency.

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

The terminal device is a non-internet of things terminal device 301.

The SUPI number segment of the terminal equipment is a first preset SUPI number segment.

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

The scheme at least brings the following beneficial effects: the second core network configures the EPLMN list only for a specific terminal device, without configuring the EPLMN list for all terminal devices. And the waste of transmission resources among 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 for indicating: the priority of the terminal device 301 accessing the first access network device 302 is higher than the priority of the terminal device 301 accessing the third access network device; the third access network device is access network device of a preset network system in the second PLMN network.

The terminal device 301 is further configured to receive the first priority indication information, and access the first access network device 302 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.

The scheme at least brings 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 priority of the frequency of a third access network device (e.g., a 4G access network device) in the second PLMN network. Thus, when the second access network device is a 5G access network device, the terminal device preferentially accesses the second access network device in the 5G network mode in the coverage area of the second access network device. The terminal equipment can be ensured to be accessed into a network with a higher system, and the network with the higher network system can be used for providing communication services.

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

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

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

The second preset condition includes at least one of:

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

The HPLMN of the terminal device 301 is a PLMN of the second PLMN network. The method comprises the steps of carrying out a first treatment on the surface of the

The terminal device 301 is located in a preset TAC.

The scheme at least brings the following beneficial effects: the first core network configures the EPLMN list only for a specific terminal device, without configuring the EPLMN list for all terminal devices. And the waste of transmission resources among 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 second priority indication information, and send the second priority indication information to the terminal device 301; the second priority indication information is used for indicating: the priority of the access of the terminal device 301 to the first access network device 302 is higher than the priority of the access of the terminal device 301 to the third access network device in the second PLMN network.

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

The scheme at least brings 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 priority of the frequency of a third access network device (e.g., a 4G access network device) in the second PLMN network. In this way, when the second access network device is a 5G access network device, the terminal device will not reselect to the third access network device upon detection of the signal of the third access network device after accessing the first access network device. Therefore, the terminal equipment can stably reside in the second access network equipment, and the condition of ping-pong network selection of the terminal equipment is avoided.

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

In case a first PLMN ID is present in the terminal equipment 301, accessing the first access network equipment 302 according to the first PLMN ID; the first PLMN ID is the same PLMNID as one PLMN ID in at least one of the first system messages.

In case the first PLMN ID is not present in the terminal device 301, searching for a signal of the second PLMN network, and accessing the access network device of the second PLMN network after searching for the signal of the second PLMN network.

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

A first PLMN ID is determined from the first EPLMN list and the first access network device 302 is accessed according to the first PLMN ID.

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

If the access is successful, one PLMN ID is used as a 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, the first PLMN ID is sent to the first access network device 302.

The scheme at least brings the following beneficial effects: and the terminal equipment selects PLMN ID according to the PLMN ID in the first system message and PLMN ID (e.g. EPLMN list) configured for the terminal equipment by the second core network equipment 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 may first access to the second access network device and the second core network device to obtain the PLMN ID configured by the second core network device for the terminal device. After this, the second core network device selects a PLMN ID and accesses the first access network device based on the PLMN ID in the first system message and the PLMN ID (e.g. EPLMN list) configured for the terminal device by the second core network device.

If the terminal equipment does not receive the PLMN ID configured by the second core network equipment for the terminal equipment and can not search for the signal of the second PLMN network, the terminal equipment respectively tries to access the first access network equipment and the first core network equipment according to each PLMN ID in the first system message until the access is successful, and the PLMN ID which is successfully accessed is used as the first PLMN ID.

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 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, 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 scheme at least brings the following beneficial effects: the terminal device may forward the first PLMN ID to the first core network device via the first access network device.

As a possible implementation, the first core network device 303 is further configured to: the first PLMN ID is received and the second core network device 304 is determined from the first PLMN ID.

The scheme at least brings 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 one possible implementation, the home network information includes at least one of: PLMN ID selected when the terminal equipment 301 accesses the first access network equipment 302, SUPI of the terminal equipment 301, HPLMN of the terminal equipment 301.

The scheme at least brings the following beneficial effects: based on the above, when the terminal device accesses to the first access network device and the first core network device by adopting different home network information, the first core network device can determine the home network of the terminal device.

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

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

And in the case that the SUPI number segment of the terminal device 301 is the second preset number segment, rejecting the terminal device 301 to access.

And rejecting the terminal equipment 301 to access if the SUPI number segment of the terminal equipment 301 is a third preset number segment and the capability of the terminal equipment 301 does not include the preset capability.

And allowing the terminal equipment 301 to access when the first PLMN ID determined by the terminal equipment 301 is a preset PLMN ID and the SUPI of the terminal equipment 301 is a preset SUPI.

The scheme at least brings the following beneficial effects: based on the technical scheme, the first core network equipment can carry out access control on the terminal equipment, so that the terminal equipment meeting the sharing requirement can be accessed to the first core network equipment, and core network sharing is realized.

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

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

Mapping the first type of slice to the second type of slice allows the second type of slice to be accessed.

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

Mapping the first type of QoS to a second type of QoS allows for QoS access of the second type.

The scheme at least brings the following beneficial effects: based on the technical scheme, the first core network device can carry out strategy control on the terminal device in the core network sharing scene.

As a possible implementation, 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 scheme at least brings the following beneficial effects: based on the technical scheme, the first core network device can perform charging control on the terminal device in the core network sharing scene.

The communication system provided in the embodiment of the present application is described in further detail above.

The following describes in detail the communications provided in the embodiments of the present application:

the embodiment of the application also provides a communication method which can be applied to the communication system shown in fig. 3. As shown in fig. 4, the communication method further includes the following S401 to S405:

s401, the terminal equipment is accessed to the first core network equipment.

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 a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network.

It should be noted 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+. Or 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 the embodiment of the present application, a first core network device and a second core network device are mainly taken as 5G core network devices, and a first access network device is exemplified as a 5G access network device. In a 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 systems, which is not limited in this application.

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

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

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

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

It should be noted that when the terminal device selects the PLMN ID according to the first system message, the terminal device accesses the first access network device by selecting the HPLMN when the terminal device includes its HPLMN in the first system message. 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 yet another possible implementation manner, when the home network information includes the SUPI of the terminal device, the first core network device may parse 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 a further possible implementation, when the HPLMN of the terminal device is included in the home network information, the first core network device determines the home network of the terminal device directly from the HPLMN of the terminal device.

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

The service data is the service data which needs to be transmitted to the second core network device by the terminal 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. And after the first access network equipment receives the service data from the terminal equipment, forwarding the service data to the first core network equipment.

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

That is, in case the first PLMN network and the second PLMN network share the access network and the core network, the terminal device may transmit service data to the second core network device through the first access network device and the first core network device. It can be understood that after the second core network receives the service data, the service data is processed, and the processing result can be returned 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 scheme at least brings the following beneficial effects: in the communication system provided in the embodiment of the present application, a communication interface is opened between a first core network device and a second core network device, through which the first core network device may route service data of a terminal device of the same PLMN network as the second core network device into the second core network device, and the second core network device processes the service data of the terminal device.

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

Thus, when the terminal equipment provides network service through the shared network, the core network equipment of the shared network can perform access control, policy control, routing control, charging control and other control services on the terminal equipment. The method solves the problem that the current shared network cannot control terminal equipment of other operators.

Before S401, the terminal device needs to acquire the PLMN ID broadcasted by the first access network device, and access the PLMN ID to the first access network device. The following is a detailed description:

in a possible implementation, the terminal device resides after the first access network device, and initiates registration to the first core network device. After the registration is successful, the terminal equipment is successfully accessed to the first core network equipment.

The above describes the procedure of the terminal device accessing the first access network device and the first core network device according to the PLMN ID broadcasted by the first access network device.

The beneficial effects brought by the above scheme may refer to the beneficial effects of the above scenario 1 and scenario 2 and the related content of the communication system in fig. 3, which are not described herein again.

The following describes a procedure of accessing the terminal device to the first access network device according to the first EPLMN list and the first priority indication information:

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

s501, the second core network device generates a first EPLMN list.

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

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

The process of generating the first EPLMN list by the second core network device in S501-S503 and sending the first EPLMN list to the terminal device may refer to the related description in the above scenario 3, which is not repeated herein.

If the access request is the same, the terminal equipment accesses the first access network equipment.

Furthermore, as shown in fig. 5, the method further includes:

s504, the second access network equipment generates first priority indication information.

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

S506, when the terminal equipment comprises the first access network equipment and the third access network equipment in the first access network equipment area, accessing the first access network equipment.

It should be noted that the second access network device and the second core network device may issue the first EPLMN list and the first priority indication information 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.

Or the second access network device and the second core network device may also issue the first EPLMN list and the first priority indication information for the terminal device after the second access network device and the second core network device first access the second access network device when the terminal device searches for the signals of the first access network device and the second access network device after moving to the coverage area of the first access network device. The present application is not limited in this regard.

In the above S504-S506, the understanding about the first priority indication information may refer to the related description in the above scenario 3, which is not repeated here.

The procedure of the terminal device accessing the first access network device according to the first EPLMN list and the first priority indication information is described above.

The beneficial effects brought by the above scheme may refer to the above scenario 3, and the beneficial effects of the related content of the communication system in fig. 3 are not described herein.

Referring to fig. 4, as shown in fig. 5, the above S401 may be specifically implemented by the following S507 to S509:

s507, the first access network device sends a first system message. Correspondingly, the terminal device receives a first system message from the first access network device.

The first access network device is an access network device in a first PLMN network. The first system message includes at least one PLMN ID. The PLMN ID included in the first system message may be understood by referring to the manner in which the first access network device broadcasts the PLMN ID in scenario 1, which is not described herein.

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

Wherein the at least one PLMN ID comprises a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of a second PLMN network broadcast by the second access network device. (corresponding to scheme 1 in scenario 1 above).

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

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

The process of accessing the terminal device to the first access network device according to at least one PLMN ID in the first system message may be understood by referring to the process of selecting a PLMN ID in the above scenario 2, which is not described herein.

It may be appreciated that the access of the terminal device to the first access network device comprises: the terminal device resides in a 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 of the at least one PLMN ID are the same as the PLMN IDs in the first EPLMN list.

S509, the terminal equipment accesses to the first core network equipment through the first access network equipment.

After the terminal device resides in the first access network device, the first access network device and the second access network device may also cause the terminal device to stably reside in the first access network device in the following manner.

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

s510, the first core network device generates a second EPLMN list.

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

S513, the terminal equipment performs cell selection or cell reselection according to the second EPLMN list.

The process of generating the second EPLMN list by the first core network device and sending the second EPLMN list to the terminal device in S510-S513 may refer to the related description in the above scenario 4, which is not repeated herein.

Furthermore, as shown in fig. 5, the method further includes:

s514, the first access network device generates second priority indication information.

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

S516, when the coverage area of the first access network device comprises the first access network device and the third access network device, the terminal device accesses the first access network device.

In the above S514-S516, the understanding about the first priority indication information may refer to the related description in the above scenario 4, which is not repeated herein.

The above describes the procedure in which the terminal device stably resides in the first access network device according to the second EPLMN list and the second priority indication information.

The beneficial effects brought by the above solution may refer to the above scenario 4, and the beneficial effects of the related content of the communication system in fig. 3, which are not described herein again.

It should be noted that in the above S508, a procedure is described in which the terminal device accesses the first access network device according to at least one PLMNID in the first system message.

The specific implementation process of S508 will be described in detail below.

As shown in fig. 6, the communication method provided in the embodiment of the present application may be specifically implemented in S502 by the following procedure:

s601, the terminal equipment analyzes the first system message and determines at least one PLMN ID.

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

S602, the terminal equipment determines whether a first PLMN ID exists in the terminal equipment.

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

That is, the terminal device determines whether there is a PLMN ID in the EPLMN list of the terminal device that is the same as at least one PLMN ID in the first system message. If so, the PLMN ID is used as a first PLMN ID.

And S603, if the terminal equipment exists, accessing the first access network equipment according to the first PLMN ID.

It should be noted that if the first PLMN ID is present in the terminal device, it is indicated 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 issues 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 PLMN ID as in the first EPLMN list. The terminal device takes the same PLMN ID as a first PLMN ID.

And S604, if the signal does not exist, the terminal equipment searches the signal of the second PLMN network.

Wherein the second PLMN network is a home network of the terminal equipment. Since the second PLMN network does not construct a 5G network in the coverage area of the first access network device, in S604, the signal of the second PLMN network that the terminal device searches for may be a signal of a 4G cell in the second PLMN network.

S605, under the condition that the signal of the second PLMN network is searched, the terminal equipment accesses to the access network equipment and the core network equipment of the second PLMN network.

After the access network device and the core network device of the second PLMN network are accessed, the access network device and the core network device of the second PLMN network refer to the above procedure in scenario 3, in which the second core network device and the second access network device issue PLMN ID auxiliary parameters to the terminal device, and issue a first EPLMN list and first priority indication information to the terminal device.

S606, the terminal equipment receives a first EPLMN list from the access network equipment of the second PLMN network.

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

The process may be implemented with reference to the process of S603, which is not described herein.

And S608, under the condition that the signal of the second PLMN network is not searched, the terminal equipment selects one PLMN ID from at least one PLMN ID and initiates access to the first access network equipment according to the PLMI ID.

S609, the terminal equipment determines whether the first access network equipment is successfully accessed.

If yes, the terminal device performs the following S610.

S610, the terminal equipment takes the one PLMN ID as a first PLMN ID.

If not, the terminal device performs the following S611.

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

In an example, in case at least one PLMN ID comprises a PLMN-ID (XA), a PLMN-ID (XB), a PLMN-ID (XC), the terminal device of operator a attempts to access the first access network device from an optional one of the three PLMN IDs. And if the first access network equipment determines that the PLMN ID is not matched with the terminal equipment, rejecting the access of the terminal equipment.

The terminal device of operator a again attempts to access the first access network device from an optional one of the three PLMN IDs, PLMN-ID (XA). And the first access network equipment determines that the PLMN ID is matched with the terminal equipment, and allows the access of the terminal equipment.

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

After this, 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 routes the terminal device into the core network of its home network.

The scheme at least brings the following beneficial effects: after receiving the PLMN ID broadcasted by the first access network device, the terminal device may select the PLMN ID in a different manner, and access the first access network device. The success rate of the terminal equipment to access the first access network equipment is improved.

It can be seen that the above technical solutions provided in the embodiments of the present application are mainly described from the method perspective. To achieve the above functions, it includes corresponding hardware structures and/or software modules that perform the respective functions. Those of skill in the art will readily appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The embodiment of the present application may divide the functional modules of the communication device according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. Optionally, the division of the modules in the embodiments of the present application is schematic, which is merely a logic function division, and other division manners may be actually implemented.

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

A processing unit 702, configured to instruct the communication unit 701 to access a first core network device through a first access network device; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; a processing unit 702, configured to instruct the communication unit 701 to send home network information to the first core network device; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network; a processing unit 702, configured 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 a first system message from a first access network device; the first access network device is an access network device in a first PLMN network; the first system message comprises at least one PLMN ID which is accessed to the first access network equipment according to the at least one PLMN ID; and accessing the first core network equipment through the first access network equipment.

Optionally, the at least one PLMN ID includes a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of a second PLMN network broadcasted by the second access network equipment; 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 broadcasted by the second access network device; or, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from a 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 of the at least one PLMN ID; in case one or more of the at least one PLMN ID is identical to a PLMN ID in the first EPLMN list, determining to access the first access network device.

Optionally, when the first EPLMN list is that the terminal device meets a first preset condition, the second core network device is that the terminal device issues the EPLMN list; the first preset condition includes at least one of: the terminal equipment is located in a preset area; the terminal equipment is terminal equipment supporting 5G SA; the terminal equipment is terminal equipment supporting preset frequency; the terminal equipment is the terminal equipment supporting and starting the VONR voice service; the terminal equipment is non-internet of things terminal equipment; the SUPI number segment of the terminal equipment is a first preset SUPI number segment; the terminal device is a terminal device subscribed to a core network service sharing the first PLMN network.

Optionally, the processing unit 702 is specifically configured to: the indication communication unit 701 receives first priority indication information from the second access network device; the first priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network; when the first access network device and the third access network device are included in the first access network device area, the communication unit 701 is instructed to access the first access network device.

Optionally, the processing unit 702 is further configured to: instruct the communication unit 701 to receive a second EPLMN list from the first access network device; the second EPLMN list includes PLMN IDs of the second PLMN network; and selecting the cell or reselecting the cell according to the second EPLMN list.

Optionally, when the second EPLMN list is that the terminal device meets a second preset condition, the first core network device is that the terminal device issues the EPLMN list; the second preset condition includes at least one of: the SUPI number segment of the terminal equipment is a second preset SUPI number segment; the HPLMN of the terminal equipment is a PLMN of the second PLMN network; the terminal equipment is located in a preset TAC.

Optionally, the processing unit 702 is further configured to: second priority indication information indicating the communication unit 701 to come from the first access network device; the second priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment 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 communication unit 701 is instructed to access the first access network device.

Optionally, the processing unit 702 is specifically configured to: the terminal equipment analyzes the first system message and determines at least one PLMN ID; in the case that the first PLMN ID exists in the terminal device, the communication unit 701 is instructed to access the first access network device according to the first PLMN ID; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages; searching for a signal of a second PLMN network in case that the first PLMN ID does not exist in the terminal device, and accessing an access network device of the second PLMN network after searching for the signal of the second PLMN network; instruct the communication unit 701 to receive a first EPLMN list from an access network device of the second PLMN network; determining a first PLMN ID according to the first EPLMN list, and accessing first access network equipment according to the first PLMN ID; if the terminal equipment does not search for the signal of the second PLMN network, selecting one PLMN ID from at least one PLMN ID, and initiating access to the first access network equipment according to the PLMI ID; if the access is successful, taking one PLMN ID as a first PLMN ID; if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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 communication unit 701 is instructed to send the first PLMN ID to the first access network device.

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

Optionally, the communication device may further comprise a storage module for storing program code and/or data of the communication device.

Wherein the processing unit 702 may be a processor or a controller. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. A processor may also be a combination of computing functions, including for example, one or more microprocessor combinations, a combination of DSPs and microprocessors, and the like. The communication unit 701 may be a transceiver circuit, a communication interface, or the like. The memory 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 according to the embodiments of the present application may be the terminal device shown in fig. 1 to 3.

Fig. 8 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present application, where the communication apparatus may be the first core network device. The terminal device includes: a communication unit 801 and a processing unit 802.

A processing unit 802 for instructing the communication unit 801 to receive home network information from the terminal device; the terminal equipment is accessed to the first core network equipment through the first access network equipment; the first access network device and the first core network device belong to a first PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is a core network device in a second PLMN network; the home network information is used for indicating that the home network of the terminal equipment is a second PLMN network; a processing unit 802, configured to determine a second access network device in the second PLMN network according to the home network information; a processing unit 802, configured to instruct the communication unit 801 to receive service data from a 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: determining a second EPLMN list; the second EPLMN list includes PLMN IDs of the second PLMN network; the communication unit 801 is instructed to send the second EPLMN list to the first access network device.

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

Optionally, the processing unit 802 is further configured to perform access control on the terminal device; the access control includes at least one of: allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment; under the condition that the SUPI number segment of the terminal equipment is a second preset number segment, rejecting the terminal equipment to access; rejecting the terminal equipment to access under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability; and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

Optionally, the processing unit 802 is further configured to perform policy control on the terminal device; policy control includes at least one of: rejecting the first type slice access of the terminal equipment; the first type of slice is a slice requested by the terminal equipment, or a slice of a preset type issued by the second core network equipment to the first core network equipment; mapping the first type of slice to a second type of slice, allowing the second type of slice to access; rejecting a first type of QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment; mapping the first type of QoS to a second type of QoS allows for QoS access of the second type.

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 comprise a storage module for storing program code and/or data of the communication device.

Wherein the processing unit 802 may be a processor or a controller. Which may implement or perform the various exemplary logic blocks, modules, and circuits described in connection with this disclosure. A processor may also be a combination of computing functions, including for example, one or more microprocessor combinations, a combination of DSPs and microprocessors, and the like. The communication unit 801 may be a transceiver circuit, a communication interface, or the like. The memory 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 according to the embodiment of the present application may be a first core network device shown in fig. 1 to 3.

From the foregoing description of the embodiments, it will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of functional modules is illustrated, and in practical application, the above-described functional allocation may be implemented by different functional modules according to needs, i.e. the internal structure of the network node is divided into different functional modules to implement all or part of the functions described above. The specific working processes of the above-described system, module and network node may refer to the corresponding processes in the foregoing method embodiments, which are not described herein.

The embodiment of the application further provides a computer readable storage medium, in which instructions are stored, and when the computer executes the instructions, the computer executes each step in the method flow shown in the method embodiment.

Embodiments of the present application provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the communication method of the method embodiments described above.

Embodiments of the present application provide a chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being configured to execute a computer program or instructions to implement a communication method as in the method embodiments described above.

The computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: electrical connections having one or more wires, portable computer diskette, hard disk. Random access Memory (Random Access Memory, RAM), read-Only Memory (ROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), registers, hard disk, optical fiber, portable compact disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium suitable for use by a person or persons of skill 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. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an application specific integrated circuit (Application Specific Integrated Circuit, ASIC). In embodiments of the present invention, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

Since the apparatus, device, computer readable storage medium, and computer program product in the embodiments of the present invention may be applied to the above-mentioned method, the technical effects that can be obtained by the apparatus, device, computer readable storage medium, and computer program product may also refer to the above-mentioned method embodiments, and the embodiments of the present invention are not repeated herein.

The foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (36)

1. A communication system, comprising: the terminal equipment, the first access network equipment, the first core network equipment and the second core network equipment;

the first access network device and the first core network device belong to a first public land mobile network PLMN network; the terminal equipment and the second core network equipment belong to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface;

the terminal equipment is used for accessing the first core network equipment through the first access network equipment and sending home network information to the first core network equipment; the home network information is used for characterizing that the home network of the terminal equipment is the second PLMN network;

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

the terminal equipment is further used for sending service data to the first core network equipment;

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 identity ID;

the terminal equipment is used for accessing the first access network equipment 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 of claim 2, wherein the at least one PLMN ID comprises a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of the second PLMN network broadcasted by a second access network device; 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 broadcasted by the second access network device;

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

4. A system according to claim 3, wherein the system further comprises: 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 one or more PLMN IDs of 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 equipment is used for receiving the first EPLMN list;

the terminal equipment is further configured to parse the first system message and determine at least one PL MN ID in the first system message; determining to access the first access network device if one or more PLMN IDs of the at least one PLMN ID are the same as PLMN IDs in the first EPLMN list.

5. The system of claim 4, wherein the first EPLMN list is an EPLMN list issued by the terminal device by the second core network device when the terminal device meets a first preset condition; the first preset condition includes at least one of the following:

the terminal equipment is located in a preset area;

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

the terminal equipment is terminal equipment supporting preset frequency;

the terminal equipment is used for supporting and starting a new air interface voice VONR voice service;

the terminal equipment is non-internet of things terminal equipment;

the user permanent identifier SUPI number segment of the terminal equipment is a first preset SUPI number segment;

the terminal equipment is the terminal equipment which signs up for the core network service sharing the first PLMN network.

6. The system of 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 for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network;

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

7. The system according to any 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; the second EPL MN list includes PLMN IDs 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;

and the terminal equipment is used for receiving the second EPLMN list and carrying out cell selection or cell reselection according to the second EPLMN list.

8. The system of 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 SUPI number segment of the terminal equipment is a second preset SUPI number segment;

The HPLMN of the terminal equipment is a PLMN of the second PLMN network;

the terminal equipment is located in a preset tracking area code TAC.

9. The system of 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 for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment in the second PLMN network;

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

10. The system according to any of the claims 2-6, characterized in that the terminal device is specifically configured to:

analyzing the first system message and determining the at least one PLMN ID;

accessing the first access network equipment according to the first PLMN ID under the condition that the first PLMN ID exists in the terminal equipment; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages;

Searching for a signal of the second PLMN network in case that the first PLMN ID does not exist in the terminal device, and accessing an access network device of the second PLMN network after searching for the signal of the second PLMN network;

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

determining the first PLMN ID according to the first EPLMN list, and accessing the first access network equipment according to the first PLMN ID;

if the terminal equipment does not search for the signal of the second PLMN network, selecting one PLMN ID from the at least one PLMN ID, and initiating access to the first access network equipment according to the PLMIID;

if the access is successful, taking the one PLMN ID as the first PLMN ID;

if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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, sending the first PLMN ID to the first access network device.

11. The system of 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 of claim 11, wherein the first core network device is further configured to: and receiving the first PLMN ID, and determining the second core network equipment according to the first PLMN ID.

13. The system of claim 12, wherein the home network information comprises at least one of: and the terminal equipment accesses the PLMN ID selected when the first access network equipment, SUPI of the terminal equipment and home public land mobile network HPLMN of the terminal equipment.

14. The system of 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:

allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment;

rejecting the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a second preset number segment;

rejecting the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability;

and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

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:

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

mapping the first type slice into a second type slice, allowing the second type slice to be accessed;

rejecting a first type of quality of service QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment;

mapping the first type of QoS to a second type of QoS, allowing access to the second type of QoS.

16. The system of claim 12, wherein the first core network device is further configured to charge the terminal device according to a data traffic of the service data when forwarding the service data to the second core network device.

17. A communication method, characterized by being applied to a communication system, the communication system comprising: the method comprises the steps of:

the terminal equipment accesses the first core network equipment through the first access network equipment; the first access network device and the first core network device belong to a first public land mobile network PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is core network equipment in the second PLMN network;

the terminal equipment sends home network information to the first core network equipment; the home network information is used for indicating that the home network of the terminal equipment is the second PLMN network, so that the first core network equipment determines the second access network equipment in the second PLMN network according to the home network information;

and the terminal equipment sends service data to the first core network equipment so that the first core network equipment forwards the service data to the second core network equipment after receiving the service data.

18. The method of claim 17, wherein the terminal device accesses a first core network device, comprising:

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

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

the terminal equipment accesses the first core network equipment through the first access network equipment.

19. The method of claim 18, wherein the at least one PLMN ID comprises a first PLMN ID of the second PLMN network; the first PLMN ID is a PLMN ID of the second PLMN network broadcasted by a second access network device;

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 broadcasted by the second access network device;

or, the at least one PLMN ID includes a third PLMN ID; the third PLMN ID is different from a 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 accesses the first access network device according to the at least one PLMN ID, comprising:

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

the terminal device determines to access the first access network device in case one or more PLMN IDs of the at least one PLMN ID are identical to PLMN IDs in the first EPLMN list.

21. The method of claim 20, wherein the first equivalent public land mobile network EPLMN list is an EPLMN list issued by the terminal device when the terminal device meets a first preset condition; the first preset condition includes at least one of the following:

the terminal equipment is located in a preset area;

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

the terminal equipment is terminal equipment supporting preset frequency;

the terminal equipment is used for supporting and starting a new air interface voice VONR voice service;

The terminal equipment is non-internet of things terminal equipment;

the user permanent identifier SUPI number segment of the terminal equipment is a first preset SUPI number segment;

the terminal equipment is the terminal equipment which signs up for the core network service sharing the first PLMN network.

22. The method of claim 20, wherein the terminal device accesses the first access network device according to the at least one PLMN ID, further comprising:

the terminal equipment receives first priority indication information from the second access network equipment; the first priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment; the third access network device is access network device of a preset network system in the second PLMN network;

and when the first access network equipment area comprises the first access network equipment and the third access network equipment, the terminal equipment accesses the first access network equipment.

23. The method according to any 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 equipment receives a second EPLMN list from the first access network equipment; the second EPLMN list includes PLMN IDs of the second PLMN network;

and the terminal equipment performs cell selection or cell reselection according to the second EPLMN list.

24. The method of 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 SUPI number segment of the terminal equipment is a second preset SUPI number segment;

the home public land mobile network HPLMN of the terminal equipment is a PLMN of the second PLMN network;

the terminal equipment is located in a preset tracking area code TAC.

25. The method of claim 23, wherein the method further comprises:

the terminal equipment receives second priority indication information from the first access network equipment; the second priority indication information is used for indicating: the priority of the terminal equipment accessing the first access network equipment is higher than the priority of the terminal equipment accessing the third access network equipment in the second PLMN network;

And when the coverage area of the first access network equipment comprises the first access network equipment and the third access network equipment, the terminal equipment accesses the first access network equipment.

26. The method according to any of claims 18-22, wherein the terminal device accesses the first access network device according to the at least one PLMN ID, comprising:

the terminal equipment analyzes the first system message and determines the at least one PLMN ID;

the terminal equipment accesses the first access network equipment according to the first PLMN ID under the condition that the first PLMN ID exists in the terminal equipment; the first PLMN ID is the same PLMN ID as one PLMN ID in at least one of the first system messages;

under the condition that a first PLMN ID does not exist in the terminal equipment, the terminal equipment searches for a signal of the second PLMN network, and access network equipment of the second PLMN network is accessed after the signal of the second PLMN network is searched;

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

determining the first PLMN ID according to the first EPLMN list, and accessing the first access network equipment according to the first PLMN ID;

If the terminal equipment does not search for the signal of the second PLMN network, the terminal equipment selects one PLMN ID from the at least one PLMN ID and initiates access to the first access network equipment according to the PLMIID;

if the access is successful, taking the one PLMN ID as the first PLMN ID;

if the access fails, another PLMN ID is selected to initiate the access to the first access network equipment 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 of claim 26, wherein the home network information comprises at least one of: and the terminal equipment accesses the PLMN ID selected when the first access network equipment, SUPI of the terminal equipment and HPLMN of the terminal equipment.

28. A communication method, characterized by being applied to a communication system, the communication system comprising: the method comprises the steps of:

the first core network equipment receives home network information from the terminal equipment; the terminal equipment accesses the first core network equipment through first access network equipment; the first access network device and the first core network device belong to a first public land mobile network PLMN network; the terminal equipment belongs to a second PLMN network; the first core network device and the second core network device are communicated through a communication interface; the second core network device is core network equipment in the second PLMN network; the home network information is used for indicating that the home network of the terminal equipment 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;

and the first core network equipment forwards the service data to the second core network equipment.

29. The method of claim 28, wherein the method further comprises:

the first core network device determines a second equivalent public land mobile network EPLMN list; the second EPLMN list includes PLMN IDs 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 comprises at least one of: and the terminal equipment is accessed to the PLMN identification ID selected when the first access network equipment, the user permanent identifier SUPI of the terminal equipment, and the home public land mobile network HPLMN of the terminal equipment.

31. The method according to claim 28 or 29, wherein the method further comprises:

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

Allowing the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a first preset SUPI number segment;

rejecting the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a second preset number segment;

rejecting the terminal equipment to be accessed under the condition that the SUPI number segment of the terminal equipment is a third preset number segment and the capability of the terminal equipment does not comprise preset capability;

and allowing the terminal equipment to access under the condition that the first PLMN ID determined by the terminal equipment is a preset PLMN ID and the SUPI of the terminal equipment is a preset SUPI.

32. The method according to claim 28 or 29, wherein the method further comprises:

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

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

mapping the first type slice into a second type slice, allowing the second type slice to be accessed;

Rejecting a first type of quality of service QoS access for the terminal device; the first type of QoS is QoS requested by the terminal equipment, or the second core network equipment transmits a preset type of QoS to the terminal equipment;

mapping the first type of QoS to a second type of QoS, allowing access to the second type of QoS.

33. The method according to claim 28 or 29, wherein the method further comprises:

and when the first core network equipment forwards the service data to the second core network equipment, the first core network equipment charges the terminal equipment according to the data flow of the service data.

34. A communication device, comprising: a communication unit and a processing unit; wherein the communication unit is used for communicating with other communication devices; the processing unit for performing the communication method of any of claims 17-27; or performing the communication method of any of claims 28-33.

35. A communication device, comprising: a processor and a memory; wherein the memory is configured to store computer-executable instructions that, when executed by the communication device, cause the communication device to perform the communication method of any of claims 17-27; or performing the communication method of any of claims 28-33.

36. A computer readable storage medium comprising instructions that, when executed, cause the computer to perform the communication method of any of claims 17-27; or performing the communication method of any of claims 28-33.