WO2023142777A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2023142777A1
WO2023142777A1 PCT/CN2022/140007 CN2022140007W WO2023142777A1 WO 2023142777 A1 WO2023142777 A1 WO 2023142777A1 CN 2022140007 W CN2022140007 W CN 2022140007W WO 2023142777 A1 WO2023142777 A1 WO 2023142777A1
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WO
WIPO (PCT)
Prior art keywords
terminal device
plmn
network
network unit
information
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PCT/CN2022/140007
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English (en)
Chinese (zh)
Inventor
金辉
窦凤辉
薛祎凡
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华为技术有限公司
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Publication of WO2023142777A1 publication Critical patent/WO2023142777A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/082—Mobility data transfer for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents

Definitions

  • the embodiments of the present application relate to the field of wireless communication, and in particular, to a communication method and device.
  • a terminal device in an idle state moves from a fifth generation (5G) network to a fourth generation (4G) network
  • a protocol data unit (PDU) has been established on the terminal device
  • the terminal device initiates a tracking area update (TAU) request in the 4G network.
  • TAU tracking area update
  • the PDU session of the terminal device stores the corresponding 4G parameters, it can be understood that the PDU session is a PDU session supporting interoperability.
  • the mobility management entity (MME) of the core network of the 4G network obtains the context information of the terminal device from the access and mobility management function (AMF) of the core network of the 5G network , thus completing the TAU.
  • AMF access and mobility management function
  • the session management function session management function, SMF
  • SMF session management function
  • the embodiments of the present application provide a communication method and device, which can avoid the problem of TAU failure, help to shorten the disconnection time of the terminal equipment, and reduce the power consumption of the terminal equipment.
  • the present application provides a communication method
  • the execution body of the method may be a second network unit, or may be a chip applied to the second network unit.
  • the following description is made by taking the execution subject as an example of the second network unit.
  • the method includes: the second network unit determines that the third public land mobile network PLMN that provides services for the terminal device belongs to the first PLMN, wherein the second network unit is a network unit in the home PLMN of the terminal device, and the number of the first PLMN is at least One, and it is different from the home PLMN of the terminal device.
  • the second network unit does not send the first target parameter to the terminal device, or the second network unit sends indication information to the terminal device, where the indication information indicates to delete the first target parameter.
  • the first target parameter includes the mapping of protocol data unit PDU session parameters of the first communication system to parameters of the second communication system, the communication system of the third PLMN that provides services for the terminal equipment includes the first communication system, and the communication of the terminal equipment belongs to the PLMN
  • the standard includes a second communication standard, and the first communication standard is different from the second communication standard.
  • the terminal device when the third PLMN that provides services for the terminal device belongs to the first PLMN, the terminal device will not receive the first target parameter, or delete the received first target parameter.
  • the terminal device reselects from the third PLMN of the first communication system currently serving itself to the PLMN of the second communication system to which it belongs, since the terminal device does not store the first target parameter, the terminal device no longer initiates TAU , so as to avoid the problem of TAU failure, help to shorten the disconnection time of the terminal equipment, and reduce the power consumption of the terminal equipment.
  • the communication method in the embodiment of the present application further includes: the second network element receives the first information from the third mobility management entity, where the third mobility management entity is a third PLMN that provides services for the terminal device
  • the first information includes information about the operator to which the third mobility management entity belongs.
  • the second network unit determining that the third PLMN that provides services for the terminal device belongs to the first PLMN includes: the second network unit determines that the third PLMN that provides services for the terminal device belongs to the first PLMN according to the first information.
  • the second network unit can determine that the third PLMN that provides services for the terminal device belongs to the first PLMN.
  • the second network unit determines that the third PLMN that provides services for the terminal device belongs to the first PLMN, including: when the second network unit determines that the terminal device is in a roaming state, the second network unit determines that the terminal device is The third PLMN providing the service belongs to the first PLMN, so as to simplify the processing process of the second network element.
  • the communication method in this embodiment of the present application further includes: the second network unit receives the second information from the third network unit or the third border gateway BG, where the third network unit provides services for terminal equipment The network element in the third PLMN, the third BG is used to connect the second network element and the third network element.
  • the second network unit determines that the terminal device is in a roaming state according to the second information.
  • the second network unit can receive information from the third network unit or the third border gateway, that is, it can be considered that the terminal device is in a roaming state.
  • the communication method in the embodiment of the present application further includes: the second network unit sends a PDU session establishment acceptance message to the terminal device.
  • the second network unit does not send the first target parameter to the terminal device, including: the PDU session establishment acceptance message does not carry the first target parameter, and correspondingly, the terminal device cannot receive the first target parameter.
  • the second network unit sends the indication information to the terminal device through a PDU session modification command message, so as to provide the indication information to the terminal device during the session modification process.
  • the first PLMN is preconfigured.
  • the communication method in this embodiment of the present application further includes: the second network unit determines that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the second network unit sends the second target parameter to the terminal device, where the second target parameter includes the mapping of the parameters of the PDU session of the first communication standard to the parameter of the second communication standard, and the communication standard of the fourth PLMN that provides services for the terminal device
  • the first communication mode is included, so that the terminal device can normally obtain the second target parameter.
  • the PDU session of the first communication standard is the PDU session in the third PLMN.
  • the PDU session of the first communication standard is the PDU session in the fourth PLMN.
  • the fourth PLMN that provides services for the terminal device is the home PLMN of the terminal device. That is to say, the PLMN currently accessed by the terminal device is the PLMN to which the terminal device belongs.
  • the fourth PLMN that provides services for the terminal device is different from the country to which the operator of the PLMN to which the terminal device belongs. That is to say, the terminal device is in a state of roaming abroad.
  • the second network unit determines that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN, including: when the second network unit determines that the terminal device is in a roaming state, the second network unit determines that the terminal device is in a roaming state.
  • the fourth PLMN that the device provides services does not belong to the first PLMN, so as to simplify the processing process of the second network unit.
  • the communication method in this embodiment of the present application further includes: the second network unit receives fourth information from the fourth network unit or the fourth border gateway BG, where the fourth network unit provides services for terminal equipment
  • the network element in the fourth PLMN, the fourth BG is used to connect the second network element and the fourth network element.
  • the second network unit determines that the terminal device is in a roaming state according to the fourth information. That is to say, the second network unit can receive the information from the fourth network unit or the fourth border gateway, that is, it can be considered that the terminal device is in a roaming state.
  • the communication method in the embodiment of the present application further includes: the second network element receives the first information from the fourth mobility management entity, where the fourth mobility management entity is a fourth PLMN that provides services for the terminal device
  • the first information includes information about the operator to which the fourth mobility management entity belongs.
  • the second network unit determining that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN includes: the second network unit determines that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN according to the first information.
  • the second network unit can determine, based on the information of the operator to which the fourth mobility management entity belongs, that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the first information includes a globally unique access and mobility management function identifier GUAMI.
  • the present application provides a communication method, and the execution body of the method may be a second network unit, or may be a chip applied to the second network unit.
  • the following description is made by taking the execution subject as an example of the second network unit.
  • the method includes: the second network unit determines that the public land mobile network PLMN that provides services for the terminal device does not belong to the first PLMN, wherein the second network unit is a network unit in the home PLMN of the terminal device, and the number of the first PLMN is at least one , and is different from the PLMN to which the terminal equipment belongs.
  • the second network unit sends the target parameter to the terminal device, wherein the target parameter includes the parameter mapping of the protocol data unit PDU session of the first communication standard to the parameter of the second communication standard, and the communication standard of the PLMN that provides services for the terminal device includes the first The communication standard, the communication standard to which the terminal device belongs to the PLMN includes the second communication standard, and the first communication standard is different from the second communication standard.
  • the second network element can provide the target parameter for the terminal device, so that the terminal device can obtain the target parameter normally.
  • the PLMN that provides services for the terminal device is the home PLMN of the terminal device.
  • the PLMN that provides services for the terminal device is different from the country to which the operator of the PLMN to which the terminal device belongs.
  • the second network unit determines that the PLMN that provides services for the terminal device does not belong to the first PLMN, including: when the second network unit determines that the terminal device is in a roaming state, the second network unit determines that the terminal device provides The serving PLMN does not belong to the first PLMN.
  • the communication method in this embodiment of the present application further includes: the second network unit receives the first information from the first network unit or the border gateway BG, where the first network unit is a PLMN that provides services for terminal equipment In the network unit, the BG is used to connect the first network unit and the second network unit.
  • the second network unit determines that the terminal device is in a roaming state according to the first information.
  • the communication method in the embodiment of the present application further includes: the second network element receives the second information from the first mobility management entity, where the first mobility management entity is a PLMN that provides services for the terminal device
  • the second information includes information about an operator to which the first mobility management entity belongs.
  • the second network unit determining that the PLMN that provides services for the terminal device does not belong to the first PLMN includes: the second network unit determines that the PLMN that provides services for the terminal device does not belong to the first PLMN according to the second information.
  • the second information includes a globally unique access and mobility management function identifier GUAMI.
  • the first PLMN is preconfigured.
  • the present application provides a communication method, and the execution subject of the method may be a terminal device, or may be a chip applied in the terminal device.
  • the following description is made by taking the execution subject as a terminal device as an example.
  • the method includes: when the terminal device moves from the first communication standard of the first public land mobile network PLMN to the second communication standard of the terminal device's home PLMN, sending a registration request message to a second mobility management entity of the terminal device's home PLMN, wherein , the first PLMN is different from the home PLMN of the terminal device, the first communication standard is different from the second communication standard, the terminal device stores target parameters, and the target parameters include the protocol data unit PDU session parameters of the first communication standard mapped to the second communication standard parameters.
  • the terminal device receives a registration accept message from the second mobility management entity.
  • the terminal device moves from the first communication standard of the first PLMN to the second communication standard of the terminal device's home PLMN
  • the terminal device moves while it is in an idle state
  • the first communication mode of the terminal device from the first PLMN The mode is reselected to the second communication mode of the home PLMN of the terminal device.
  • the terminal device switches from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs.
  • the terminal device even if the first PLMN is different from the home PLMN of the terminal device, and the terminal device stores target parameters, when the terminal device moves from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device, the terminal device also A registration request message is initiated, and TAU is no longer initiated, so as to avoid the problem of TAU failure, help to shorten the disconnection time of the terminal device, and reduce the power consumption of the terminal device.
  • the communication method in the embodiment of the present application further includes: the terminal device determines, according to the first information, that the first PLMN is different from the home PLMN of the terminal device.
  • the first information includes information of at least one third PLMN, the third PLMN is different from the home PLMN of the terminal device, and the third PLMN includes the first PLMN.
  • the first information includes preconfigured information of at least one third PLMN.
  • the terminal device determines, based on the first information, that the first PLMN is different from the home PLMN of the terminal device.
  • the communication method in the embodiment of the present application further includes: the terminal device receives first information from the second mobility management entity, so as to obtain the first information from the second mobility management entity of the home network.
  • the first information and the equivalent public land mobile network EPLMN are carried in the same message.
  • the EPLMN includes at least the first PLMN. That is to say, the terminal device can obtain the first information during the registration process of the home network, so that when the terminal device reselects from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device, it can initiate the reselection in time.
  • the registration request message can effectively avoid the problem of TAU failure.
  • the communication method in this embodiment of the present application further includes: the terminal device receives the first information from the second network unit, where the second network unit belongs to a network unit in the home PLMN of the terminal device, and the second network unit receives the first information from the second The network unit obtains the first information.
  • the terminal device receives the first information from the second network element through a PDU session establishment acceptance message. That is to say, the terminal device can obtain the first information during the establishment of the PDU session, so that when the terminal device reselects from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device, it can initiate registration in time Request message, so as to effectively avoid the problem of TAU failure.
  • the present application provides a communication method, and the execution subject of the method may be a terminal device, or may be a chip applied in the terminal device.
  • the following description is made by taking the execution subject as a terminal device as an example.
  • the method includes: the terminal device sends a registration request message to a first mobility management entity of a first public land mobile network (PLMN), wherein the first PLMN is different from the home PLMN of the terminal device.
  • PLMN public land mobile network
  • the terminal device receives a registration accept message from the first mobility management entity.
  • the terminal device deletes the target parameter, or the terminal device does not generate the target parameter, or does not save the target parameter when the terminal device receives the target parameter from the second network unit, wherein the second network unit is a network unit in the home PLMN of the terminal device
  • the target parameters include the mapping of protocol data unit PDU session parameters of the first communication standard to parameters of the second communication standard, the communication standard of the first PLMN includes the first communication standard, and the communication standard of the terminal device’s home PLMN includes the second communication standard.
  • the terminal device deletes the target parameter, or does not generate the target parameter, or when the terminal device receives a message from the second network unit When the target parameter of , the target parameter is not saved.
  • the terminal device reselects from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs, since the terminal device does not save the target parameters, the terminal device initiates a registration request message and no longer initiates a registration request message.
  • TAU so as to avoid the problem of TAU failure, help to shorten the disconnection time of the terminal equipment, and reduce the power consumption of the terminal equipment.
  • the communication method in the embodiment of the present application further includes: the terminal device determines, according to the first information, that the first PLMN is different from the home PLMN of the terminal device.
  • the first information includes information of at least one third PLMN, the third PLMN is different from the home PLMN of the terminal device, and the third PLMN includes the first PLMN.
  • the communication method in this embodiment of the present application further includes: the terminal device receiving first information from a second mobility management entity, where the second mobility management entity is a network element in the home PLMN of the terminal device.
  • the first information and the equivalent public land mobile network EPLMN are carried in the same message.
  • the EPLMN includes at least the first PLMN.
  • the communication method in this embodiment of the present application further includes: the terminal device receiving first information from a second network unit, where the second network unit belongs to a network unit in the home PLMN of the terminal device.
  • the terminal device receives the first information from the second network element through a PDU session establishment acceptance message.
  • the present application provides a communication device, which may be the second network unit in the first aspect or any possible design of the first aspect, or a chip that realizes the function of the second network unit;
  • the above-mentioned communication device includes corresponding modules, units, or means (means) for realizing the above-mentioned method, and the modules, units, or means may be implemented by hardware, software, or by executing corresponding software on hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes a processing unit, a sending unit and a receiving unit.
  • the processing unit is configured to determine that the third public land mobile network PLMN providing services for the terminal device belongs to the first PLMN, wherein the communication device is a network unit in the PLMN to which the terminal device belongs, and the number of the first PLMN is at least one, and It is different from the PLMN to which the terminal equipment belongs.
  • the sending unit is not used to send the first target parameter to the terminal device, or the sending unit is used to send indication information to the terminal device, wherein the indication information indicates to delete the first target parameter;
  • the first target parameter includes a protocol data unit of the first communication standard
  • the parameters of the PDU session are mapped to the parameters of the second communication standard, the communication standard of the third PLMN that provides services for the terminal device includes the first communication standard, the communication standard of the PLMN that the terminal device belongs to includes the second communication standard, the first communication standard and the second communication standard
  • the two communication formats are different.
  • the receiving unit is configured to receive first information from a third mobility management entity, where the third mobility management entity is a network element in a third PLMN that provides services for terminal equipment, and the first information It includes information about the operator to which the third mobility management entity belongs.
  • the processing unit is configured to determine that the third PLMN that provides services for the terminal device belongs to the first PLMN, including: determining, according to the first information, that the third PLMN that provides services for the terminal device belongs to the first PLMN.
  • the processing unit configured to determine that the third PLMN that provides services for the terminal device belongs to the first PLMN includes: when determining that the terminal device is in a roaming state, determining that the third PLMN that provides services for the terminal device belongs to First PLMN.
  • the receiving unit is further configured to receive second information from a third network unit or a third border gateway BG, where the third network unit is a network in a third PLMN that provides services for the terminal device unit, the third BG is used to connect the communication device and the third network unit.
  • the processing unit is further configured to determine that the terminal device is in a roaming state according to the second information.
  • the sending unit is further configured to send a PDU session establishment acceptance message to the terminal device.
  • the sending unit is not configured to send the first target parameter to the terminal device, including: the PDU session establishment acceptance message does not carry the first target parameter.
  • the sending unit is configured to send indication information to the terminal device through a PDU session modification command message.
  • the first PLMN is preconfigured.
  • the processing unit is further configured to determine that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the sending unit is further configured to send the second target parameter to the terminal device, wherein the second target parameter includes mapping the parameters of the PDU session of the first communication standard to the parameter of the second communication standard, and the fourth PLMN that provides services for the terminal device
  • the communication standard includes the first communication standard.
  • the fourth PLMN that provides services for the terminal device is the home PLMN of the terminal device.
  • the fourth PLMN that provides services for the terminal device is different from the country to which the operator of the PLMN to which the terminal device belongs.
  • the processing unit configured to determine that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN includes: when determining that the terminal device is in a roaming state, determining the fourth PLMN that provides services for the terminal device Does not belong to the first PLMN.
  • the receiving unit is further configured to receive fourth information from a fourth network unit or a fourth border gateway BG, where the fourth network unit is a network in a fourth PLMN that provides services for terminal equipment unit, the fourth BG is used to connect the communication device and the fourth network unit.
  • the processing unit is further configured to determine that the terminal device is in a roaming state according to the fourth information.
  • the receiving unit is further configured to receive first information from a fourth mobility management entity, where the fourth mobility management entity is a network element in a fourth PLMN that provides services for terminal equipment, and the first The information includes information about the operator to which the fourth mobility management entity belongs.
  • the processing unit is configured to determine that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN, including: according to the first information, determining that the fourth PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the first information includes a globally unique access and mobility management function identifier GUAMI.
  • the present application provides a communication device, which may be the second network unit in the above-mentioned second aspect or any possible design of the second aspect, or a chip that realizes the function of the above-mentioned second network unit;
  • the above-mentioned communication device includes corresponding modules, units, or means (means) for realizing the above-mentioned method, and the modules, units, or means may be implemented by hardware, software, or by executing corresponding software on hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes a processing unit, a sending unit and a receiving unit.
  • the processing unit is configured to determine that the public land mobile network PLMN that provides services for the terminal device does not belong to the first PLMN, wherein the communication device is a network unit in the PLMN to which the terminal device belongs, and the number of the first PLMN is at least one, and is the same as The terminal devices belong to different PLMNs.
  • the sending unit is configured to send the target parameter to the terminal device, wherein the target parameter includes the parameter mapping of the protocol data unit PDU session of the first communication standard to the parameter of the second communication standard, and the communication standard of the PLMN that provides services for the terminal device includes the second communication standard.
  • a communication standard, the communication standard to which the terminal device belongs to the PLMN includes a second communication standard, and the first communication standard is different from the second communication standard.
  • the PLMN that provides services for the terminal device is the home PLMN of the terminal device.
  • the PLMN that provides services for the terminal device is different from the country to which the operator of the PLMN to which the terminal device belongs.
  • the processing unit is configured to determine that the PLMN that provides services for the terminal device does not belong to the first PLMN, including: when determining that the terminal device is in a roaming state, determining that the PLMN that provides services for the terminal device does not belong to the first PLMN PLMN.
  • the receiving unit is further configured to receive the first information from the first network unit or the border gateway BG, wherein the first network unit is a network unit in the PLMN that provides services for the terminal equipment, and the BG uses For connecting the first network unit and the communication device.
  • the processing unit is further configured to determine that the terminal device is in a roaming state according to the first information.
  • the receiving unit is further configured to receive second information from the first mobility management entity, where the first mobility management entity is a network element in the PLMN that provides services for the terminal device, and the second information includes Information about the operator to which the first mobility management entity belongs.
  • the processing unit is configured to determine that the PLMN that provides services for the terminal device does not belong to the first PLMN, including: determining, according to the second information, that the PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the second information includes a globally unique access and mobility management function identifier GUAMI.
  • the first PLMN is preconfigured.
  • the present application provides a communication device, which may be a terminal device in any possible design of the above-mentioned third aspect or the third aspect, or a chip that realizes the functions of the above-mentioned terminal device; the communication device includes To realize the corresponding modules, units, or means (means) of the above method, the modules, units, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes a processing unit, a sending unit and a receiving unit.
  • the processing unit is used to determine to move from the first communication system of the first public land mobile network PLMN to the second communication system of the home PLMN of the communication device, and the processing unit is also used to control the second movement of the sending unit to the home PLMN of the communication device
  • the management entity sends a registration request message, wherein the first PLMN is different from the home PLMN of the communication device, the first communication standard is different from the second communication standard, and the communication device stores target parameters, and the target parameters include the protocol data unit PDU session of the first communication standard The parameters of are mapped to the parameters of the second communication standard.
  • the processing unit is further configured to control the receiving unit to receive the registration acceptance message from the second mobility management entity.
  • the processing unit is further configured to determine, according to the first information, that the first PLMN is different from the home PLMN of the communication device.
  • the first information includes information of at least one third PLMN, the third PLMN is different from the home PLMN of the communication device, and the third PLMN includes the first PLMN.
  • the receiving unit is further configured to receive the first information from the second mobility management entity.
  • the first information and the equivalent public land mobile network EPLMN are carried in the same message.
  • the EPLMN includes at least the first PLMN.
  • the receiving unit is further configured to receive the first information from the second network unit, where the second network unit belongs to the network unit in the home PLMN of the communication device.
  • the receiving unit is configured to receive the first information from the second network unit through a PDU session establishment accept message.
  • the present application provides a communication device, which may be a terminal device in any possible design of the fourth aspect or the fourth aspect, or a chip that realizes the functions of the terminal device; the communication device includes To realize the corresponding modules, units, or means (means) of the above method, the modules, units, or means can be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • the communication device includes a processing unit, a sending unit and a receiving unit.
  • the sending unit is configured to send a registration request message to a first mobility management entity of a first public land mobile network PLMN, where the first PLMN is different from the home PLMN of the communication device.
  • the receiving unit is configured to receive a registration acceptance message from the first mobility management entity.
  • the processing unit is configured to delete the target parameter, or the processing unit is configured not to generate the target parameter, or the receiving unit is also configured to receive the target parameter from the second network unit, the processing unit is configured not to save the target parameter, wherein,
  • the second network unit is a network unit in the PLMN to which the communication device belongs, and the target parameters include mapping parameters of the protocol data unit PDU session of the first communication system to parameters of the second communication system, and the communication system of the first PLMN includes the first communication system,
  • the communication standard to which the communication device belongs to the PLMN includes the second communication standard.
  • the processing unit is further configured to determine, according to the first information, that the first PLMN is different from the home PLMN of the communication device.
  • the first information includes information of at least one third PLMN, the third PLMN is different from the home PLMN of the communication device, and the third PLMN includes the first PLMN.
  • the receiving unit is further configured to receive the first information from the second mobility management entity, where the second mobility management entity is a network element in the home PLMN of the communication device.
  • the first information and the equivalent public land mobile network EPLMN are carried in the same message.
  • the EPLMN includes at least the first PLMN.
  • the receiving unit is further configured to receive the first information from the second network unit, where the second network unit belongs to the network unit in the home PLMN of the communication device.
  • the receiving unit is configured to receive the first information from the second network unit through a PDU session establishment accept message.
  • the embodiment of the present application provides a communication device, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device performs any of the above aspects or any In one aspect the method performed by the second network element in any possible design.
  • the communication device may be the second network element in the above first aspect or any possible design of the first aspect, or the communication device may be the first aspect in the above second aspect or any possible design of the second aspect A second network unit, or a chip that implements the functions of the above-mentioned second network unit.
  • an embodiment of the present application provides a communication device, including: a processor; the processor is coupled to a memory, and is used to read and execute instructions in the memory, so that the communication device performs any of the above aspects Or a method performed by the second network element in any possible design of any aspect.
  • the communication device may be the second network element in the above first aspect or any possible design of the first aspect, or the communication device may be the first aspect in the above second aspect or any possible design of the second aspect A second network unit, or a chip that implements the functions of the above-mentioned second network unit.
  • the embodiment of the present application provides a chip, including a processing circuit and an input/output interface.
  • the input and output interface is used to communicate with modules other than the chip
  • the chip may be a chip that implements the function of the second network unit in the first aspect or any possible design of the first aspect.
  • the processing circuit is used to run computer programs or instructions to implement the method in the above first aspect or any possible design of the first aspect.
  • the chip may be a chip that implements the function of the second network unit in the second aspect or any possible design of the second aspect.
  • the processing circuit is used to run computer programs or instructions to implement the method in the above second aspect or any possible design of the second aspect.
  • the embodiment of the present application provides a communication device, including: a processor and a memory; the memory is used to store computer instructions, and when the processor executes the instructions, the communication device performs any one of the above-mentioned aspects or A method executed by a terminal device in any possible design of any aspect.
  • the communication device may be the terminal device in the above third aspect or any possible design of the third aspect, or the communication device may be the terminal device in the above fourth aspect or any possible design of the fourth aspect, Or a chip that implements the functions of the above-mentioned terminal equipment.
  • the embodiment of the present application provides a communication device, including: a processor; the processor is coupled with a memory, and is used to read and execute instructions in the memory, so that the communication device performs any of the above-mentioned A method executed by a terminal device in any possible design of any aspect or any aspect.
  • the communication device may be the terminal device in the above third aspect or any possible design of the third aspect, or the communication device may be the terminal device in the above fourth aspect or any possible design of the fourth aspect, Or a chip that implements the functions of the above-mentioned terminal equipment.
  • the embodiment of the present application provides a chip, including a processing circuit and an input and output interface.
  • the input and output interface is used to communicate with modules other than the chip, for example, the chip may be a chip that realizes the function of the terminal device in any possible design of the above third aspect or the third aspect.
  • the processing circuit is used to run computer programs or instructions to implement the method in the above third aspect or any possible design of the third aspect.
  • the chip may be a chip that implements the function of the terminal device in the fourth aspect or any possible design of the fourth aspect.
  • the processing circuit is used to run computer programs or instructions to implement the method in the above fourth aspect or any possible design of the fourth aspect.
  • the embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores instructions, and when it is run on a computer, the computer can execute any one of the above-mentioned aspects. method.
  • the embodiment of the present application provides a computer program product containing instructions, which when run on a computer, enables the computer to execute the method in any one of the above aspects.
  • an embodiment of the present application provides a circuit system, the circuit system includes a processing circuit configured to execute the method in any one of the above aspects.
  • FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application
  • FIG. 2 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of another communication system applied in an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • Fig. 8a is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 8b is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 10a is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 10b is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 11 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 12 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 13 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application. As shown in Figure 1, the communication system includes terminal equipment, access network equipment and a core network.
  • terminal equipment includes equipment that provides voice and/or data connectivity to users, specifically, equipment that provides voice to users, or equipment that provides data connectivity to users, or equipment that provides voice and data connectivity to users sexual equipment.
  • Examples may include a handheld device with wireless connectivity, or a processing device connected to a wireless modem.
  • the terminal device can communicate with the core network via a radio access network (radio access network, RAN), exchange voice or data with the RAN, or exchange voice and data with the RAN.
  • radio access network radio access network
  • the terminal equipment may include user equipment (user equipment, UE), wireless terminal equipment, mobile terminal equipment, device-to-device communication (device-to-device, D2D) terminal equipment, vehicle to everything (vehicle to everything, V2X) terminal equipment , machine-to-machine/machine-type communications (machine-to-machine/machine-type communications, M2M/MTC) terminal equipment, Internet of things (internet of things, IoT) terminal equipment, subscriber unit, subscriber station station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user Agent (user agent), or user equipment (user device), etc.
  • IoT Internet of things
  • it may include mobile phones (or “cellular” phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer built-in mobile devices, and the like.
  • PCS personal communication service
  • cordless telephone cordless telephone
  • session initiation protocol session initiation protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • constrained devices such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities, etc.
  • it includes barcodes, radio frequency identification (radio frequency identification, RFID), sensors, global positioning system (global positioning system, GPS), laser scanners and other information sensing devices.
  • the various terminal devices described above if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as vehicle-mounted terminal devices. ).
  • the terminal device may further include a relay (relay).
  • a relay relay
  • all devices capable of performing data communication with the base station can be regarded as terminal devices.
  • the device for realizing the function of the terminal device may be the terminal device, or may be a device capable of supporting the terminal device to realize the function, such as a chip system, and the device may be installed in the terminal device.
  • the system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
  • the terminal equipment is used as an example for implementing terminal functions, and the introduction is made.
  • the access network device may be an access point for wireless communication or wired communication, such as a base station or a base station controller, a wireless-fidelity (wireless-fidelity, wifi) access point or wifi controller, or an access point for fixed network access wait.
  • the base station may include various types of base stations, such as micro base stations (also called small stations), macro base stations, relay stations, access points, etc., which are not specifically limited in this embodiment of the present application.
  • the base station may be a global system for mobile communication (GSM), a base station (base transceiver station, BTS) in code division multiple access (code division multiple access, CDMA), broadband Base station (node B) in code division multiple access (wideband code division multiple access, WCDMA), evolved base station (evolutional node B, eNB or e-NodeB) in long term evolution (long term evolution, LTE), Internet of things ( Internet of things (IoT) or eNB in narrowband-internet of things (NB-IoT), the fifth generation (the fifth generation, 5G) mobile communication network or the future evolution of public land mobile network (public land) A base station in a mobile network (PLMN), which is not limited in this embodiment of the present application.
  • GSM global system for mobile communication
  • BTS base station
  • CDMA code division multiple access
  • node B in code division multiple access
  • WCDMA wideband code division multiple access
  • evolutional node B, eNB or e-NodeB in long
  • the core network includes various core network devices, such as access management network elements and session management network elements.
  • the access management network element is mainly used for mobility management and access management, etc., and can be used to implement functions other than session management in the mobility management entity (mobility management entity, MME) function, for example, lawful interception and Access authorization/authentication and other functions.
  • the access management network element may include an access and mobility management function (core access and mobility management function, AMF) network element.
  • the session management network element is mainly used for session management, Internet protocol (internet protocol, IP) address allocation and management of terminal equipment, selection of endpoints that can manage user plane functions, policy control and charging function interfaces, and downlink data notification.
  • the session management network element may include a session management function (session management function, SMF) network element.
  • SMF session management function
  • the MME can refer to the introduction in FIG. 2
  • the AMF network element and the SMF network element can refer to the introduction in FIG. 3 .
  • the core network equipment may also include other network elements, such as user plane function (user plane function, UPF) network elements, etc., which will not be described here one by one.
  • FIG. 2 shows a schematic structural diagram of a fourth generation (the fourth generation, 4G) communication system.
  • the 4G communication system includes evolved universal mobile telecommunications system (universal mobile telecommunications system, UMTS) terrestrial radio access network (evolved UMTS territorial radio access network, E-UTRAN) equipment, MME, serving gateway (serving gateway, SGW), packet Data network (packet data network, PDN) gateway (PDN gateway, PGW), policy and charging rules function (policy and charging rules function, PCRF) network elements and home subscriber server (home subscriber server, HSS) and other network elements or equipment.
  • UMTS universal mobile telecommunications system
  • E-UTRAN evolved Universal Mobile telecommunications system
  • MME serving gateway
  • SGW packet Data network
  • PDN gateway packet Data network gateway
  • PGW policy and charging rules function
  • PCRF policy and charging rules function
  • home subscriber server home subscriber server
  • HSS home subscriber server
  • terminal equipment accesses E-UTRAN equipment through LTE-Uu
  • E-UTRAN equipment communicates with MME through S1-MME
  • E-UTRAN equipment communicates with SGW through S1-U
  • different MMEs communicate through S10
  • the MME communicates with the HSS through S6a
  • the MME communicates with the SGW through S11
  • the PGW communicates with the PCRF network element through Gx
  • the PCRF network element communicates with the server through Rx
  • the SGW communicates with the PGW through S5
  • the PGW accesses the server through the SGi.
  • the E-UTRAN equipment is used to implement functions related to the evolved network radio.
  • the MME is responsible for the mobility management of the control plane, including user context and mobility state management, and allocation of temporary user identities.
  • the SGW is the user plane anchor point between the 3rd generation partnership project (3GPP) access networks, and is the interface for terminating E-TURAN.
  • the PGW is the user plane anchor point between the 3GPP access network and the non-3GPP access network, and is the interface between the termination and the external PDN.
  • the PCRF network element is used for policy control decision and flow charging control function.
  • the HSS is used to store user subscription information.
  • the server is used to provide internet protocol (internet protocol, IP) services, such as voice/video services based on internet protocol multimedia subsystem (internet protocol multimedia subsystem, IMS), packet switched streaming service (packet switched streaming service, PSS), etc.
  • IP internet protocol
  • IMS internet protocol multimedia subsystem
  • PSS packet switched streaming service
  • FIG. 3 shows a schematic architecture diagram of a 5G communication system.
  • the 5G communication system includes radio access network (radio access network, RAN) equipment, user plane function (user plane function, UPF) network element, AMF network element, SMF network element, authentication server function (authentication server function, AUSF) network network element, network slice selection function (NSSF) network element, network exposure function (network exposure function, NEF) network element, network function storage function (network exposure function repository function, NRF) network element, policy control function ( policy control function (PCF) network element, unified data management (unified data management, UDM) network element, unified data storage (unified data repository, UDR) network element, application function (application function, AF) network element or billing function ( charging function, CHF) network element, etc.
  • radio access network radio access network
  • UPF user plane function
  • AMF authentication server function
  • AUSF authentication server function
  • NSSF network slice selection function
  • NEF network exposure function
  • NRF network exposure function repository function
  • PCF policy control
  • FIG. 3 is only an example of some examples of network elements or entities in the 5G communication system, and the 5G communication system may also include some diagrams such as network data analysis function (network data analytics function, NWDAF) network elements, etc. 3 Network elements or entities not shown in the figure, which are not specifically limited in this embodiment of the present application.
  • NWDAF network data analytics function
  • the terminal device accesses the 5G network through the RAN device, and the terminal device communicates with the AMF through the N1 interface (N1 for short); the RAN device communicates with the AMF network element through the N2 interface (N2 for short); the RAN device communicates with the AMF network element through the N3 interface
  • the interface (N3 for short) communicates with the UPF network element; the SMF network element communicates with the UPF network element through the N4 interface (N4 for short), and the UPF network element accesses the data network (data network, DN) through the N6 interface (N6 for short).
  • N1, N2, N3, N4 and N6 respectively represent reference points (reference points) between relevant network elements/network functions.
  • AUSF network element AMF network element, SMF network element, NSSF network element, NEF network element, NRF network element, PCF network element, UDM network element, UDR network element, CHF network element or AF network element shown in Figure 3
  • Other control plane functions use service-oriented interfaces to interact.
  • the service interface provided by the AUSF network element is Nausf; the service interface provided by the AMF network element is Namf; the service interface provided by the SMF network element is Nsmf; the service interface provided by the NSSF network element is Nnssf;
  • the service interface provided by NEF network elements is Nnef; the service interface provided by NRF network elements is Nnrf; the service interface provided by PCF network elements is Npcf; the service interface provided by UDM network elements is Nudm;
  • the service interface provided by the element is Nudr; the service interface provided by the CHF network element is Nchf; the service interface provided by the AF network element is Naf.
  • the relevant function description and interface description can refer to the 5G system architecture (5G system architecture) diagram in the 23501 standard, and will not be repeated here.
  • an AMF network element may also be called an AMF or an AMF entity. In this embodiment of the present application, only the AMF network element is used as an example for introduction.
  • an SMF network element may also be called an SMF or an SMF entity. In this embodiment of the present application, only an SMF network element is used as an example for introduction.
  • the core network device may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.
  • the above functional modules may be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (eg, cloud platform).
  • 2nd-generation wireless telephone technology (2G) network
  • 3G 3rd-generation wireless telephone technology
  • 4th-generation mobile communication Technology (4th-generation wirelesstelephone technology, 4G) network
  • fifth-generation mobile communication technology (5th-generation wirelesstelephone technology, 5G) network
  • sixth-generation mobile communication technology (6th-generation wirelesstelephone technology, 6G) network
  • the 4G network may also be called an evolved packet system (evolved packet system, EPS) network
  • the 5G network may also be called a new radio (new radio, NR) network.
  • EPS evolved packet system
  • new radio new radio
  • PLMN is a network established and operated by the government or its approved operators to provide land mobile communication services for the public.
  • the PLMN is interconnected with the public switched telephone network to form a regional or national scale communication network.
  • MCC mobile country code
  • MNC mobile network number
  • MNC mobile network number
  • MCC uniquely indicates the country to which the mobile subscriber belongs. For example, China's MCC is 460.
  • the MNC can uniquely represent the network in the country.
  • the MNC corresponding to China Mobile may include 00
  • the MNC corresponding to China Unicom may include 01.
  • different operators may correspond to different PLMNs.
  • the PLMNs of China Mobile may include 46000, 46002, 46004, 46007, and 46008
  • the PLMNs of China Unicom may include 46001, 46006, 46009, and 46010.
  • the PLMN of China Telecom may include 46003, 46011 and 46012; the PLMN of China Radio and Television may include 46015.
  • the PLMN corresponding to each operator may also include others, which is not limited in this embodiment of the present application.
  • the visiting network party refers to the operator that provides inter-network roaming services to the terminal equipment of other operators within the roaming area.
  • a network that provides inter-network roaming services to terminal devices of other operators is described as a visited network.
  • the inter-network roaming service may be a 5G core network inter-network roaming service.
  • the home network party refers to the operator that provides the roaming service across different networks to the terminal equipment of this network through the network of other operators in the roaming area.
  • the network that provides inter-network roaming services to terminal devices on this network through other operator networks is described as a home network.
  • the inter-network roaming service may be a 5G core network inter-network roaming service.
  • the visited network may be the 5G network of the visited operator
  • the home network may be the 5G network of the home operator.
  • the visited network and the home network are connected through a border gateway (boarder gateway, BG).
  • the network elements in the visited network and the network elements in the home network are connected, as shown in FIG. 5 .
  • the SMF network element in the visited network is called a visited-SMF (visited-SMF, V-SMF) network element.
  • the SMF network element in the home network is called a home-SMF (home-SMF, H-SMF) network element.
  • the PCF network element in the home network is called a home PCF (home-PCF, H-PCF) network element.
  • Radio resource control (RRC)
  • RRC_IDLE RRC idle state
  • RRC_CONNECTED RRC connected state
  • RRC_CONNECTED RRC idle state
  • RRC_IDLE RRC idle state
  • RRC_INACTIVE RRC inactive state
  • RRC_CONNECTED RRC connected state
  • the terminal device when a terminal device in an idle state moves from a 5G network to a 4G network, if there is at least one PDU session that supports interoperability among the established PDU sessions on the terminal device, the terminal device initiates a TAU request in the 4G network ; If not, initiate an initial attach request.
  • the PDU session of the terminal device stores the corresponding 4G parameters, it can be understood that the PDU session is a PDU session supporting interoperability.
  • the PDU session of the terminal device does not store the corresponding 4G parameters, it can be understood that the PDU session does not support interoperability.
  • the 4G parameters corresponding to the PDU session include the parameters that the PDU session in the 5G network is mapped to the 4G network, such as the EPS bearer identity (EPS bearer identity, EBI), the quality of service flow (quality of service, QoS flow) parameter corresponding to the 4G network, etc. .
  • EPS bearer identity EPS bearer identity, EBI
  • QoS flow quality of service
  • the core network element MME of the 4G network obtains the context information of the terminal device from the core network element AMF of the 5G network, thereby completing the TAU.
  • the terminal device still uses the SMF network element (that is, the H-SMF network element) of the home network to provide services.
  • the SMF network element of the home network always sends the 4G parameters corresponding to the PDU session to the terminal device.
  • the interface between the AMF network element of the visited network and the MME network element of the home network is not opened, if the terminal device moves from the 5G network of the visited network to the 4G network of the home network, the MME cannot obtain the context information, resulting in If the TAU fails, the power consumption and disconnection time of the terminal equipment will increase, and the user experience will be poor.
  • the embodiment of the present application provides three communication methods, and the communication method of the embodiment of the present application (such as the first communication method, the second communication method, or the third communication method) can be applied to the communication shown in Figure 1 system.
  • a mobility management entity may be described as a first mobility management entity, and a network unit may be described as a first network unit.
  • the mobility management entity may be described as a second mobility management entity, and the network unit may be described as a second network unit.
  • the names of messages between network elements or the names of parameters in messages in the following embodiments of the present application are just examples, and may be other names in specific implementations. The description is unified here, and will not be described in detail below.
  • the second network unit determines that the PLMN that provides services for the terminal device belongs to the first PLMN. Wherein, there is at least one first PLMN, which is different from the home PLMN of the terminal device. Afterwards, the second network unit does not send the target parameter to the terminal device, or the second network unit sends indication information to the terminal device. Wherein, the indication information indicates the deletion target parameter.
  • the target parameters include the mapping of the parameters of the PDU session of the first communication standard to the parameters of the second communication standard, the communication standard of the PLMN that provides services for the terminal device includes the first communication standard, and the communication standard of the PLMN that the terminal device belongs to includes the second communication standard, The first communication standard is different from the second communication standard. In this way, when the PLMN that provides services for the terminal device belongs to the first PLMN, the terminal device will not receive the target parameter, or delete the received target parameter.
  • the terminal device When the terminal device reselects from the PLMN of the first communication standard that currently provides services to itself to the PLMN of the second communication standard that it belongs to, since the terminal device does not store the target parameters, the terminal device no longer initiates TAU, thereby avoiding TAU The problem of failure helps to shorten the disconnection time of the terminal equipment and reduce the power consumption of the terminal equipment.
  • the first communication method 600 provided in the embodiment of the present application includes the following steps:
  • the second network element determines that the PLMN that provides services for the terminal device belongs to the first PLMN.
  • the second network unit is a network unit in the home PLMN of the terminal device, and at least has a session management function.
  • the second network element may be an H-SMF network element. It should be understood that with the evolution of communication technologies, the second network unit may also have other names, and this embodiment of the present application does not limit the name of the network unit.
  • the PLMN that provides services for the terminal device is different from the PLMN to which the terminal device belongs.
  • the PLMN that provides services for the terminal device may be a visited PLMN accessed by the terminal device.
  • the communication system of the PLMN providing the service for the terminal device and the PLMN to which the terminal device belongs may be the same or different.
  • the PLMN providing services for the terminal device and the communication system of the PLMN to which the terminal device belongs are used as an example for introduction.
  • the PLMN that provides services for the terminal device may be a 5G network
  • the home PLMN of the terminal device may be a 4G network, a 3G network, or a 2G network.
  • the PLMN that provides services for the terminal device may be a 4G network
  • the home PLMN of the terminal device may be a 3G network or a 2G network.
  • the PLMN that provides services for the terminal device may be a 3G network
  • the home PLMN of the terminal device may be a 2G network.
  • only the PLMN that provides services for the terminal device is a 5G network
  • the home PLMN of the terminal device is a 4G network as an example for introduction.
  • the first PLMN there is at least one first PLMN, which is different from the home PLMN of the terminal device.
  • the operator of the terminal equipment's PLMN is China Mobile
  • the first PLMN may be a network of another operator (such as China Unicom, China Telecom, etc.) other than China Mobile.
  • the first PLMN may include the PLMNs identified by 46001 and 46006.
  • the first PLMN may be a PLMN where a certain operator provides shared services to other operators.
  • the coverage area of the first PLMN may be a remote area, such as Xinjiang.
  • the access network equipment of China Mobile broadcasts two PLMN IDs, namely 460,00 and 460,30.
  • the PLMN identified by 460,00 provides services for China Mobile's terminal equipment.
  • the PLMN identified by 460 and 30 is the PLMN shared by China Mobile to China Unicom to provide services to China Unicom's terminal equipment.
  • the PLMN identified by the above 460, 30 belongs to the first PLMN.
  • the first PLMN may be pre-configured.
  • the information of the first PLMN may be stored in the form of a table (list), or in other forms.
  • the table may be described as a list of designated PLMNs, or other names, which are not limited in this embodiment of the present application.
  • the country of the first PLMN and the operator of the PLMN to which the terminal device belongs may be the same or different, which is not limited here.
  • the second network unit further executes S603, and correspondingly, the implementation process of S601 includes S601a.
  • the introduction of S603 and S601a is as follows:
  • the first mobility management entity sends the first information to the second network element.
  • the second network element receives the first information from the first mobility management entity.
  • the first mobility management entity is a network element in the PLMN that provides services for terminal equipment, and is mainly used for mobility management and access management.
  • the first mobility management entity may be an AMF network element in the visited PLMN. It should be understood that with the evolution of communication technologies, the first mobility management entity may also have other names, and this embodiment of the present application does not limit the name of the entity.
  • the first information includes at least information about the operator to which the first mobility management entity belongs.
  • the first information includes a globally unique access and mobility management function identifier (globally unique AMF identifier, GUAMI).
  • GUAMI is composed of MCC and MNC corresponding to AMF network elements, 8-bit AMF region ID (AMF region ID), 10-bit AMF set ID (AMF set ID) and 6-bit AMF pointer (AMF pointer).
  • the MCC identifies the country to which the operator belongs, and the MNC is the network identifier of the operator.
  • AMF region ID and AMF set ID are combined to indicate a group of AMF network elements serving the same tracking area (tracking area, TA).
  • AMF pool AMF pool
  • AMF identifier AMF identifier
  • AMI AMF identifier
  • AMF region ID is unique under a group of MCC and MNC
  • AMF set ID is unique under AMF region ID.
  • the first mobility management entity ie, the AMF network element
  • the second network element ie, the H-SMF network element
  • receives the GUAMI from the first mobility management entity ie, the AMF network element
  • the GUAMI may be transmitted through a PDU session creation context request message, may also be transmitted through a PDU session update request message, or may be transmitted through other messages, which is not limited in this embodiment of the present application.
  • the transmission process of the first information will be introduced with reference to FIG. 8a and FIG. 8b.
  • the first mobility management entity that is, the AMF network element
  • the second network unit that is, the H-SMF network element
  • the session establishment process includes the following steps:
  • the terminal device sends a PDU session establishment request (PDU session establishment request) message to the AMF network element.
  • the AMF network element receives the PDU session establishment request message from the terminal device.
  • the PDU session establishment request message requests establishment of a PDU session.
  • the terminal device initiates a PDU session establishment request message to the AMF network element of the visited PLMN.
  • the AMF network element in response to the PDU session establishment request message, selects an SMF network element from at least one SMF network element in the visited PLMN as a V-SMF network element, and the home PLMN from the terminal equipment An SMF network element is selected from at least one SMF network element as an H-SMF network element.
  • the AMF network element sends a PDU session creation context request message to the V-SMF network element.
  • the V-SMF network element receives the PDU session creation context request message from the AMF network element.
  • the PDU session creation context request message in S12 can be recorded as the PDU session creation context request (Nsmf_PDU Session_CreateSMContext request) message transmitted by the Nsmf interface.
  • This message includes PDU session establishment request message and GUAMI.
  • the GUAMI is the GUAMI of the AMF network element in S12.
  • the V-SMF network element sends a PDU session creation context request message to the H-SMF network element.
  • the H-SMF network element receives the PDU session creation context request message from the V-SMF network element.
  • the second network unit can receive the first information through the session establishment process.
  • the first mobility management entity that is, the AMF network element
  • the second network element that is, the H-SMF network element
  • the terminal device may move from the 5G network of the home network party to the 5G network of the visited network party. In this case, the terminal device can initiate a session modification procedure.
  • the session modification process includes the following steps:
  • the terminal device sends a registration request (registration request) message to the new AMF network element.
  • the new AMF network element receives the registration request message from the terminal device.
  • the registration request message includes registration type (registration type) information, and the registration type (registration type) information indicates mobile registration updating (mobility registration updating).
  • the new AMF network element sends a context request message to the old AMF network element.
  • the old AMF network element receives the context request message from the new AMF.
  • the context request message is used to request the context information of the terminal device.
  • the context request message may include a Namf interface transmitted user equipment context transfer (Namf_Communication_UEContextTransfer) request message.
  • the old AMF network element sends the context information to the new AMF network element.
  • the new AMF network element receives the context information from the old AMF.
  • the context information in S23 includes the context information of the terminal device.
  • the context information may be carried in a user equipment context transfer response (Namf_Communication_UEContextTransfer response) message transmitted by the Namf interface.
  • the context information of the terminal device includes but is not limited to the following information: the identifier of the PDU session, the Internet protocol (internet protocol, IP) address used by the PDU session, the business of the PDU session and the session continuity (service and session continuity, SSC) mode, context information of QoS flow, etc.
  • the aforementioned PDU session is a session currently established by the terminal device, and the number of the aforementioned PDU session may be one or multiple, which is not limited in this embodiment of the present application.
  • the new AMF network element sends a PDU session update request message to the H-SMF network element.
  • the H-SMF network element receives the PDU session update request message from the new AMF network element.
  • the PDU session update request message includes GUAMI.
  • the GUAMI in S24 is the GUAMI of the new AMF network element.
  • the PDU session update request message in S24 can be recorded as a PDU session update context request (Nsmf_PDU Session_UptateSMContext request) message transmitted by the Nsmf interface.
  • Nsmf_PDU Session_UptateSMContext request PDU session update context request
  • the AMF network element of the visiting PLMN involved in the embodiment of the present application sends a PDU session update request message to the SMF network element (H-SMF network element) of the home PLMN, indicating that Yes
  • the AMF network element of the visited PLMN sends a PDU session update request message to the SMF network element of the visited PLMN (that is, the V-SMF network element), and the SMF network element of the visited PLMN (that is, the V-SMF network element) element) and then send the PDU session update request message to the SMF network element (H-SMF network element) belonging to the PLMN
  • the SMF network element (ie V-SMF network element) of the PLMN that visits the PLMN plays the role of transparent transmission in this step , for brevity of description, in the embodiments of the present application and in the accompanying
  • the second network unit can receive the first information through the session modification process.
  • S601a For the second network element, after obtaining the first information, S601a can be executed:
  • the second network unit determines, according to the first information, that the PLMN that provides services for the terminal device belongs to the first PLMN.
  • the second network unit determines that the first mobility management entity belongs to the first PLMN, that is, the terminal The PLMN that the device provides services belongs to the first PLMN.
  • the GUAMI in the PDU session creation context request message is the information of the AMF network element of the visited PLMN.
  • the GUAMI in the PDU session update request message is also the information of the AMF network element of the visited network.
  • the second network unit determines that the PLMN that provides services for the terminal device belongs to the first PLMN based on the information of the AMF network element that the terminal device visits the PLMN, such as the information of the operator to which the AMF network element belongs.
  • the second network element before performing S601, the second network element further performs S604:
  • the second network unit determines that the terminal device is in a roaming state.
  • the roaming state refers to that the operator of the PLMN providing the service for the terminal equipment is different from the operator of the PLMN to which the terminal equipment belongs.
  • the operator of the terminal equipment belongs to the PLMN is China Mobile, if the current operator of the PLMN that provides services for the terminal equipment is other operators except China Mobile, such as China Unicom, China If there is one item in radio and television, the terminal device is in the roaming state.
  • the roaming status includes roaming within the country and roaming abroad.
  • roaming within a country means that the PLMN providing services for the terminal equipment is different from the PLMN to which the terminal equipment belongs, but the PLMN providing services for the terminal equipment and the PLMN operator of the terminal equipment belong to the same country.
  • Overseas roaming refers to that the PLMN providing services for the terminal device is different from the PLMN to which the terminal device belongs, and the PLMN providing services for the terminal device is different from the country to which the PLMN operator belongs to the terminal device.
  • the terminal device may be in a state of roaming within a country, or may be in a state of roaming abroad.
  • the terminal device In the first communication method 600 of the embodiment of the present application, only the terminal device is in the roaming state within the country as an example for introduction.
  • the first network element is an SMF network element that visits the PLMN, that is, a V-SMF network element
  • the second network element is an SMF network element that belongs to the PLMN, that is, an H-SMF network element. If the terminal device is in the roaming state, the message transmission process between the first network element (V-SMF network element) and the second network element (H-SMF network element) is as follows: step a and step b:
  • Step a the V-SMF network element sends a message to the BG.
  • the BG receives the message from the V-SMF network element.
  • the message in step a may include the above-mentioned PDU session creation context request message, may also include the above-mentioned PDU session update request message, and may also include other messages, which are not limited in this embodiment of the present application.
  • the message in step a at least carries the information of the V-SMF network element, such as the identifier of the V-SMF network element.
  • step b the BG sends a message to the H-SMF network element.
  • the H-SMF network element receives the message from the BG.
  • the message in step b is determined based on the message in step a.
  • the message in step b includes the message in step a.
  • the message in step b also includes BG information, such as the BG ID.
  • S604 may be implemented as: if the second network unit executes step b, determine that the terminal device is in a roaming state.
  • the second network unit that is, the H-SMF network element determines that the terminal device is in the roaming state according to the identifier carried in the message in step b (such as the identifier of the V-SMF network element or the identifier of the BG).
  • the second network unit receives the message from the first network unit, and in this case, the second network unit also determines that the terminal device is in a roaming state.
  • the first network element has at least a session management function.
  • the first network element may be a V-SMF network element.
  • the first network unit may also have other names, and this embodiment of the present application does not limit the name of the network unit.
  • the V-SMF network element sends a message to the H-SMF network element, and step a and step b are executed.
  • the V-SMF network element when the terminal device moves from the 5G network of the home network to the 5G network of the visited network, the V-SMF network element also sends a message to the H-SMF network element, step a and step b be executed.
  • the second network element that is, the H-SMF network element
  • step a and step b are not executed, the second network unit determines that the terminal device is not in the roaming state.
  • the second network unit For the second network unit, if the terminal device is in the roaming state, the second network unit only executes S601, otherwise, if the terminal device is not in the roaming state, then the second network unit does not need to execute S601, to simplify the second network unit process. It should be understood that in FIG. 7 , only the case where S601 is implemented as S601a is taken as an example, and the execution sequence of S604 and S601 is shown.
  • both S603 and S604 are optional steps.
  • the second network unit may first execute S603, Execute S604 again. If the message in step a (or step b) includes other messages, then the second network unit may execute S603 first, and then execute S604, or execute S604 first, and then execute S603, or execute S603 and S604 at the same time. Examples are not limited to this.
  • S602a may be performed, as shown in the block of mode 1 in FIG. 6
  • S602b may be performed, as shown in the block of mode 2 in FIG. 6 .
  • the introduction of S602a and S602b is as follows:
  • the second network element does not send the target parameter to the terminal device.
  • the target parameters include mapping parameters of the PDU session of the first communication standard to parameters of the second communication standard.
  • the first communication standard is different from the second communication standard, for example, the first communication standard may be 5G, the second communication standard may be 4G, 3G, or 2G, or the first communication standard may be 4G, and the second communication standard Can be 3G, or 2G.
  • the first communication standard is 5G and the second communication standard is 4G as an example for introduction.
  • the target parameters are introduced as follows:
  • a terminal device accesses a DN by creating a PDU session, and a session may include one or more data flows, such as quality of service (QoS flow).
  • QoS flow quality of service
  • a terminal device accesses a DN by creating a packet data network (PDN connection), and one connection can contain multiple EPS bearers.
  • PDN connection packet data network
  • the terminal device may move from the 5G network to the 4G network.
  • the second network element For the quality of service flow (QoS flow) that may be handed over to the 4G network, the second network element will allocate a corresponding EPS bearer identity (EPS bearer identity, EBI).
  • EPS bearer identity EPS bearer identity
  • the above target parameters may include 4G parameters of the PDU session, such as QoS flow parameters, EBI and so on.
  • the second network unit does not assign the target parameter to the terminal device.
  • the second network unit does not send the target parameter to the terminal device.
  • the session establishment process includes the following steps:
  • the H-SMF network element When the H-SMF network element does not assign target parameters to the terminal device, the H-SMF network element sends a PDU session creation context response message to the V-SMF network element. Correspondingly, the V-SMF network element receives the PDU session creation context response message from the H-SMF network element.
  • the PDU session creation context response message in S14 can be recorded as the PDU session creation context response (Nsmf_PDU Session_CreateSMContext response) message transmitted by the Nsmf interface.
  • the message includes a PDU session establishment accept (PDU session establishment accept) message.
  • PDU session establishment acceptance message does not carry the above target parameter.
  • the V-SMF network element sends a PDU session creation context response message to the AMF network element.
  • the AMF network element receives the PDU session creation context response message from the V-SMF network element.
  • the AMF network element sends a PDU session establishment acceptance message to the terminal device.
  • the terminal device receives the PDU session establishment acceptance message from the AMF network element.
  • the PDU session establishment acceptance message in S16 can refer to the introduction of S14, and will not be repeated here.
  • the second network element when the H-SMF network element is used as the second network element and no target parameter is assigned to the terminal device, the second network element sends a PDU session establishment acceptance message that does not carry the target parameter. In this way, the second network unit does not send the target parameter to the terminal device, which can be specifically realized that the above-mentioned PDU session establishment acceptance message does not carry the target parameter, and accordingly, the terminal device cannot receive the target parameter from the second network unit.
  • the second network unit sends indication information to the terminal device.
  • the terminal device receives the indication information from the second network unit.
  • the indication information indicates the deletion target parameter.
  • the target parameter in S602b is consistent with the target parameter in S602a, which will not be repeated here.
  • the session modification process includes the following steps:
  • the H-SMF network element sends a PDU session update response message to the new AMF network element.
  • the new AMF network element receives the PDU session update response message from the H-SMF network element.
  • the PDU session update response message includes a PDU session modification command message
  • the PDU session modification command message carries indication information to instruct the terminal device to delete the target parameter.
  • the PDU session update response message can be transmitted through the Nsmf interface, which is recorded as the Nsmf_PDU Session_UptateSMContext response message.
  • the PDU session modification command message can be recorded as a PDU Session Modification Command message.
  • the PDU Session Modification Command message includes mapped EPS bearer contexts (Mapped EPS bearer contexts). Wherein, the mapped EPS bearer context carries a delete new EPS bearer (delete new EPS bearer) instruction in the operation code (operation code). Wherein, the above indication information may be implemented as the above indication of deleting the new EPS bearer.
  • the new AMF network element sends a registration accept (registration accept) message to the terminal device.
  • the terminal device receives a registration acceptance message from the new AMF network element.
  • the new AMF network element sends a PDU session modification command message to the terminal device.
  • the terminal device receives the PDU session modification command message from the new AMF network element.
  • the PDU session modification command message in S27 carries the mapped EPS bearer context to transmit instruction information to the terminal device.
  • the terminal device sends a PDU session modification command confirmation message to the new AMF network element.
  • the new AMF network element receives the PDU session modification command confirmation message from the terminal device.
  • the PDU session modification command acknowledgment message may be recorded as PDU Session Modification Command ACK.
  • the terminal device deletes the 4G parameters corresponding to the PDU session, such as EBI and 4G QoS parameters.
  • the second network unit when the H-SMF network element is used as the second network unit and sends indication information to the terminal device, the second network unit sends the indication information to the terminal device by sending a PDU session modification command message to instruct the terminal device to delete the target parameter .
  • the PLMN that provides services for the terminal equipment belongs to the first PLMN.
  • the PLMN that provides services for the terminal device may not belong to the first PLMN.
  • the second network element sends the target parameter to the terminal device, see the processing steps shown in Figure 9 for details:
  • the second network element determines that the PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the PLMN that provides services for the terminal device is the same as the home PLMN of the terminal device. That is to say, the PLMN currently accessed by the terminal device is the home PLMN of the terminal device. In this case, the terminal device is not in a roaming state, and the first PLMN and the country to which the terminal device belongs to the PLMN operator may be the same or different, which is not limited herein.
  • the first PLMN may include a PLMN of a domestic operator, or may include a PLMN of an operator in another country.
  • the PLMN that provides services for the terminal device is different from the country to which the terminal device belongs to the PLMN operator. That is to say, the PLMN currently accessed by the terminal device is a network of a foreign operator. In this case, the terminal device is roaming abroad.
  • the first PLMN is the same as the country to which the PLMN operator of the terminal device belongs.
  • the home PLMN of the terminal equipment is the network of a Chinese mobile operator
  • the first PLMN only includes PLMNs of domestic operators, and does not include PLMNs of operators in other countries.
  • the second network unit further executes S903, and correspondingly, the implementation process of S901 includes S901a.
  • the introduction of S903 and S901a is as follows:
  • the first mobility management entity sends the first information to the second network element.
  • the second network element receives the first information from the first mobility management entity.
  • the first mobility management entity is a network element in the PLMN that currently provides services for the terminal equipment, and is mainly used for mobility management and access management.
  • the first mobility management entity may be an AMF network element.
  • the first mobility management entity may also have other names, and this embodiment of the present application does not limit the name of the entity.
  • the PLMN serving the terminal device is the same as the home PLMN of the terminal device
  • the first mobility management entity is a network element in the home PLMN of the terminal device.
  • the first mobility management entity is a network element in the PLMN of the operator in other countries.
  • the transmission process of the first information is introduced: the terminal device moves from the 5G network of the visited network party to the 5G network of the home network party .
  • the terminal device can initiate a session modification procedure.
  • the new AMF network element there are two mobility management entities involved in the session establishment process, the new AMF network element and the old AMF network element.
  • the first mobility management entity is the network element of the terminal equipment belonging to the PLMN, and still belongs to the new AMF network element. The specific process can still refer to the description in FIG. 8b , and will not be repeated here.
  • S901a For the second network element, after obtaining the first information, S901a can be executed:
  • the second network unit determines, according to the first information, that the PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the second network unit determines that the first mobility management entity does not belong to the first PLMN, that is, The PLMN that the terminal device provides services does not belong to the first PLMN.
  • the terminal device moving from the 5G network of the visited network party to the 5G network of the home network party as an example.
  • the GUAMI is also the information of the AMF network element of the home network party.
  • the second network element determines that the PLMN serving the terminal device does not belong to the first PLMN based on the information of the AMF network element of the home network.
  • the PLMN that provides services for the terminal device is different from the country to which the operator of the PLMN to which the terminal device belongs. That is, the terminal device is in the roaming state, and belongs to the foreign roaming state. Since the first PLMN is the same as the country to which the PLMN operator of the terminal device belongs. In this case, the PLMN that provides services for the terminal device does not belong to the first PLMN.
  • the second network unit can determine that the PLMN that provides services for the terminal device does not belong to the first PLMN.
  • S904 can also be executed:
  • the second network unit determines that the terminal device is in a roaming state.
  • the roaming state can refer to the introduction of S604, which will not be repeated here.
  • step a and step b are executed, and the second network unit can determine that the terminal device is in a roaming state.
  • the second network unit executes S901 to further determine whether the PLMN serving the terminal device belongs to the first PLMN, so as to simplify the processing process of the second network unit.
  • the first PLMN is the same as the country to which the PLMN operator of the terminal device belongs.
  • both S903 and S904 are optional steps.
  • the second network unit may first execute S903, Execute S904 again. If the message in step a (or step b) includes other messages, then the second network unit may execute S903 first, and then execute S904, or execute S904 first, and then execute S903, or execute S903 and S904 at the same time. Examples are not limited to this.
  • the second network element sends the target parameter to the terminal device.
  • the terminal device receives the target parameter from the second network element.
  • the introduction is still made by taking the example that the terminal device can move from the 5G network of the visited network party to the 5G network of the home network party.
  • the PDU session modification command message includes the following parameters: PDU session identifier (PDU Session ID), QoS parameters (QoS Flow level QoS parameters) corresponding to the QoS flow, and mapped EPS bearer contexts (Mapped EPS bearer contexts).
  • the PDU session identifier is used to identify a PDU session
  • the QoS parameter corresponding to the QoS flow carries the EBI corresponding to the QoS flow
  • the mapped EPS bearer context carries one or more 4G QoS parameters and EBI corresponding to the QoS flow
  • the mapped The EPS bearer context is carried in the operation code (operation code) to create a new EPS bearer (Create new EPS bearer) instruction.
  • the above-mentioned EBI and 4G QoS parameters are target parameters. That is to say, compared with the PDU session modification command message in S602b, the PDU session modification command message no longer carries indication information, but carries target parameters.
  • the second network element when the H-SMF network element is used as the second network element, the second network element sends the target parameter to the terminal device by sending a PDU session modification command message, so as to provide the target parameter to the terminal device.
  • the second mobility management of the terminal device's home PLMN when the terminal device reselects from the first communication standard of the first PLMN to the second communication standard of the terminal device's home PLMN, the second mobility management of the terminal device's home PLMN The entity sends a Registration Request message.
  • the first PLMN is different from the home PLMN of the terminal device
  • the first communication system is different from the second communication system
  • the terminal device stores target parameters
  • the target parameters include the parameters of the protocol data unit PDU session of the first communication system mapped to the second communication system format parameters.
  • the terminal device receives a registration acceptance message from the second mobility management entity.
  • the terminal device saves the target parameters, when the terminal device moves from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device, the terminal The device also initiates a registration request message and no longer initiates a TAU, thereby avoiding the problem of TAU failure, helping to shorten the disconnection time of the terminal device and reduce the power consumption of the terminal device.
  • the second communication method 1100 provided by the embodiment of the present application includes the following steps:
  • the terminal device determines to reselect or switch from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device.
  • the scenario shown in S1101 includes: the terminal device moves from the 5G network of the visited PLMN to the 4G network of the home PLMN of the terminal device.
  • the processing performed by the terminal device includes the above S1101.
  • the terminal device moves in an idle state, the terminal device reselects from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs. If the terminal device moves while in the connected state, the terminal device switches from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs.
  • the first PLMN is the PLMN that currently provides services for the terminal device.
  • the first PLMN may be the visited PLMN of the terminal device.
  • S601 refer to the introduction of S601, which will not be repeated here.
  • the terminal device stores target parameters, and the target parameters can be referred to the introduction of S602a, which will not be repeated here.
  • the target parameter saved by the terminal device may be generated by the terminal device itself, or may be received from the second network unit. For details, refer to the description of S902 , which will not be repeated here.
  • the terminal device sends a registration request message to the second mobility management entity.
  • the second mobility management entity receives the registration request message from the terminal device.
  • the second mobility management entity is a network element in the PLMN to which the terminal equipment belongs, and is mainly used for mobility management and access management.
  • the second mobility management entity may be an MME.
  • the first mobility management entity may also have other names, and this embodiment of the present application does not limit the name of the entity.
  • the registration request message may be recorded as an initial attach message. That is to say, the terminal device sends an initial attach message to the MME.
  • the MME receives the initial attach message from the terminal device.
  • the second mobility management entity sends a registration acceptance message to the terminal device.
  • the terminal device receives a registration acceptance message from the second mobility management entity.
  • the second mobility management entity may be an MME.
  • the registration acceptance message can be recorded as an attach accept message. That is to say, the MME sends an attach accept message to the terminal device.
  • the terminal device receives the attach accept message from the MME.
  • the terminal device further executes S1104 before S1102:
  • the terminal device determines, according to the first information, that the first PLMN is different from the home PLMN of the terminal device.
  • the first information includes information of at least one third PLMN
  • the third PLMN is different from the home PLMN of the terminal device
  • the third PLMN includes the first PLMN.
  • the third PLMN may be a network of another operator (such as China Unicom, China Telecom, etc.) other than China Mobile.
  • the third PLMN may include the PLMNs identified by 46001 and 46006.
  • the third PLMN may be a PLMN where a certain operator provides shared services to other operators.
  • the coverage area of the third PLMN may be a remote area, such as Xinjiang.
  • the access network equipment of China Mobile broadcasts two PLMN IDs, namely 460,00 and 460,30.
  • the PLMN identified by 460,00 provides services for China Mobile's terminal equipment.
  • the PLMN identified by 460 and 30 is the PLMN shared by China Mobile to China Unicom to provide services to China Unicom's terminal equipment.
  • the PLMN identified by the above 460, 30 belongs to the third PLMN.
  • the third PLMN may be pre-configured.
  • the first information includes preconfigured information of at least one third PLMN.
  • the information of the first PLMN may be stored in the form of a table (list), or in other forms.
  • the table may be described as a list of designated PLMNs, or other names, which are not limited in this embodiment of the present application.
  • the country of the third PLMN and the operator of the PLMN to which the terminal device belongs may be the same or different, which is not limited here.
  • S1104 is an optional step.
  • the terminal device may execute S1104 first, then S1101, or execute S1101 first, and then execute S1104, or execute S1101 and S1104 at the same time.
  • This application implements Examples are not limited to this.
  • the manners for the terminal device to obtain the first information include the following two methods:
  • the terminal device also executes S1105a:
  • the second mobility management entity sends the first information to the terminal device.
  • the terminal device receives the first information from the second mobility management entity.
  • the first information in S1105a is consistent with the first information in S1104, which will not be repeated here.
  • the terminal device may obtain the first information during the registration process of the home network. Specifically, the terminal device sends a registration request message to the second mobility management entity. Correspondingly, the second mobility management entity receives the registration request message from the terminal device. Then, the second mobility management entity sends a registration acceptance message to the terminal device. Correspondingly, the terminal device receives a registration acceptance message from the second mobility management entity.
  • the registration acceptance message includes first information and equivalent public land mobile network (equivalent public land mobile network, EPLMN) information.
  • EPLMN information includes the information of the above-mentioned first PLMN, so that the terminal device camps on the first PLMN.
  • the terminal device can obtain the first information during the registration process of the home network, so that the terminal device can initiate a registration request in time when reselecting from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device message, thereby effectively avoiding the problem of TAU failure.
  • the terminal device also executes S1105b:
  • the second network unit sends the first information to the terminal device.
  • the terminal device receives the first information from the second network unit.
  • the first information in S1105b is consistent with the first information in S1104, which will not be repeated here.
  • the second network unit sends the first information to the terminal device through a PDU session establishment acceptance message.
  • the terminal device receives the first information from the second network unit through the PDU session establishment acceptance message.
  • the steps of the PDU session establishment process can be referred to as shown in FIG. 8a.
  • the PDU session establishment acceptance messages of S14, S15 and S16 all carry the first information.
  • the terminal device can obtain the first information during the establishment of the PDU session, so that when the terminal device reselects from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs, it can initiate a registration request in time message, thereby effectively avoiding the problem of TAU failure.
  • the terminal device sends a registration request message to the first mobility management entity of the first PLMN.
  • the first PLMN is different from the home PLMN of the terminal device.
  • the terminal device receives a registration accept message from the first mobility management entity.
  • the terminal device deletes the target parameter, or the terminal device does not generate the target parameter, or when the terminal device receives the target parameter from the second network element, it does not save the target parameter.
  • the target parameter includes the parameter mapping of the protocol data unit PDU session of the first communication standard to the parameter of the second communication standard
  • the communication standard of the first PLMN includes the first communication standard
  • the communication standard of the terminal equipment belonging to the PLMN includes the second communication standard .
  • the terminal device deletes the target parameter, or does not generate the target parameter, or when the terminal device receives a message from the second network unit When the target parameter of , the target parameter is not saved.
  • the terminal device reselects from the first communication system of the first PLMN to the second communication system of the PLMN to which the terminal device belongs, since the terminal device does not save the target parameters, the terminal device initiates a registration request message and no longer initiates a registration request message.
  • TAU so as to avoid the problem of TAU failure, help to shorten the disconnection time of the terminal equipment, and reduce the power consumption of the terminal equipment.
  • the third communication method 1300 provided by the embodiment of the present application includes the following steps:
  • the terminal device sends a registration request message to the first mobility management entity of the first PLMN.
  • the first management network element receives the registration request message from the terminal device.
  • the first PLMN is different from the PLMN to which the terminal equipment belongs, and reference may be made to the introduction of S1101, which will not be repeated here.
  • the first mobility management entity is a network element in the PLMN that provides services for terminal equipment, and is mainly used for mobility management and access management.
  • the first PLMN is a network visited by the terminal device
  • the first mobility management entity is an AMF network element in the network visited by the terminal device.
  • the terminal device sends a registration request message to the AMF network element.
  • the AMF network element receives the registration request message from the terminal device.
  • the first mobility management entity sends a registration acceptance message to the terminal device.
  • the terminal device receives a registration acceptance message from the first mobility management entity.
  • the first PLMN is a network visited by the terminal device
  • the first mobility management entity is an AMF network element in the network visited by the terminal device.
  • the AMF network element sends a registration acceptance message to the terminal device.
  • the terminal device receives the registration acceptance message from the AMF network element. In this way, the terminal device can complete the registration process in the first PLMN, and is in a registration state in the first PLMN.
  • S1303a For the terminal device, after executing S1302, you can execute S1303a, as shown in the box of "Method 1" in Figure 13, or you can execute S1303b, as shown in the box of "Method 2" in Figure 13, you can also execute S1303c, as shown in the box of "Mode 3" in FIG. 13 .
  • S1303a, S1303b and S1303c is as follows:
  • the terminal device deletes the target parameter.
  • the target parameter deleted by the terminal device may be a parameter received from the second network unit, and reference may be made to the description of S902, which will not be repeated here.
  • the terminal device does not generate the target parameter.
  • the terminal device after the terminal device registers with the first PLMN, the terminal device does not generate the target parameter.
  • the terminal device reselects from the first communication system of the first PLMN to the second communication system of the home PLMN of the terminal device, the terminal device does not generate the target parameter.
  • the second network unit sends a PDU session modification command message to the terminal device.
  • the target parameter is carried in the PDU session modification command message. In this case, even if the terminal device receives the target parameter from the second network element, it does not save the target parameter.
  • the terminal device further executes S1104 before S1303a (or S1303b, or S1303c), that is, the terminal device determines that the first PLMN is different from the home PLMN of the terminal device according to the first information.
  • the way for the terminal device to obtain the first information can refer to the introduction of S1105a and S1105b, which will not be repeated here.
  • the embodiment of the present application further provides a communication device, and the communication device may be the network element in the foregoing method embodiment, or a device including the foregoing network element, or may be a component applicable to the network element.
  • the communication device includes hardware structures and/or software modules corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software in combination with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.
  • FIG. 14 shows a schematic structural diagram of a communication device 1400 .
  • the communication device 1400 includes a processing unit 1401 , a sending unit 1402 and a receiving unit 1403 .
  • the processing unit 1401 is configured to support the terminal device to perform other processing operations that the terminal device needs to perform in FIG. 6 .
  • the sending unit 1402 is configured to support the terminal device to perform other sending operations that the terminal device in FIG. 6 needs to perform.
  • the receiving unit 1403 is configured to support the terminal device to perform S602b in FIG. 6 , and/or other receiving operations that the terminal device needs to perform in the embodiment of the present application.
  • the processing unit 1401 is configured to support the terminal device to perform S1101 in FIG. 11 and/or other processing operations that the terminal device needs to perform in this embodiment of the application.
  • the sending unit 1402 is configured to support the terminal device to perform S1102 in FIG. 11 , and/or other sending operations that the terminal device needs to perform in the embodiment of the present application.
  • the receiving unit 1403 is configured to support the terminal device to perform S1103 in FIG. 11 , and/or other receiving operations that the terminal device needs to perform in the embodiment of the present application.
  • the processing unit 1401 is used to support the terminal device to execute S1303a, S1303b, or S1303c in FIG. 13, and/or the terminal device in the embodiment of this application needs to execute other processing operations.
  • the sending unit 1402 is configured to support the terminal device to perform S1301 in FIG. 13 , and/or other sending operations that the terminal device needs to perform in the embodiment of the present application.
  • the receiving unit 1403 is configured to support the terminal device to perform S1302 in FIG. 13 , and/or other receiving operations that the terminal device needs to perform in the embodiment of the present application.
  • the processing unit 1401 is used to support the second network unit to execute S601 in FIG. Other processing operations.
  • the sending unit 1402 is configured to support the second network unit to perform S602b in FIG. 6 , and/or other sending operations that the second network unit needs to perform in the embodiment of the present application.
  • the receiving unit 1403 is configured to support the second network unit to perform other receiving operations that need to be performed by the second network unit in FIG. 6 .
  • the processing unit 1401 is configured to support the second mobility management entity to perform other processing operations that the second mobility management entity needs to perform in FIG. 11 .
  • the sending unit 1402 is configured to support the second mobility management entity to perform S1103 in FIG. 11 , and/or other sending operations that the second mobility management entity needs to perform in the embodiment of the present application.
  • the receiving unit 1403 is configured to support the second mobility management entity to perform S1102 in FIG. 11 , and/or other receiving operations that the second mobility management entity needs to perform in the embodiment of the present application.
  • the processing unit 1401 is configured to support the first mobility management entity to perform other processing operations that the first mobility management entity needs to perform in FIG. 13 .
  • the sending unit 1402 is configured to support the first mobility management entity to perform S1302 in FIG. 13 , and/or other sending operations that the first mobility management entity needs to perform in the embodiment of the present application.
  • the receiving unit 1403 is configured to support the first mobility management entity to perform S1301 in FIG. 13 , and/or other receiving operations that the first mobility management entity needs to perform in the embodiment of the present application.
  • the communication device 1400 may further include a storage unit 1404 for storing program codes and data of the communication device, and the data may include but not limited to original data or intermediate data.
  • the processing unit 1401 may be a processor or a controller, such as a CPU, a general processor, an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on.
  • the sending unit 1402 may be a communication interface, a transmitter, or a sending circuit, etc., where the communication interface is collectively referred to.
  • the communication interface may include multiple interfaces, for example, it may include: interface and/or other interfaces.
  • the receiving unit 1403 may be a communication interface, a receiver, or a receiving circuit, etc., where the communication interface is collectively referred to as, in a specific implementation, the communication interface may include multiple interfaces, for example, may include: interface and/or other interfaces.
  • the sending unit 1402 and the receiving unit 1403 may be physically or logically implemented as the same unit.
  • the storage unit 1404 may be a memory.
  • the processing unit 1401 is a processor
  • the sending unit 1402 and the receiving unit 1403 are communication interfaces
  • the storage unit 1404 is a memory
  • the communication device involved in this embodiment of the present application may be as shown in FIG. 15 .
  • the communication device includes: a processor 1501 , a communication interface 1502 , and a memory 1503 .
  • the communication device may further include a bus 1504 .
  • the communication interface 1502, the processor 1501 and the memory 1503 can be connected to each other through the bus 1504;
  • the bus 1504 can be a peripheral component interconnect standard (peripheral component interconnect, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus etc.
  • the bus 1504 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 15 , but it does not mean that there is only one bus or one type of bus.
  • the embodiments of the present application further provide a computer program product carrying computer instructions, and when the computer instructions are run on a computer, the computer is made to execute the method described in the foregoing embodiments.
  • an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and when the computer instructions are run on a computer, the computer executes the method described in the above-mentioned embodiments.
  • an embodiment of the present application further provides a chip, including: a processing circuit and a transceiver circuit, and the processing circuit and the transceiver circuit are used to implement the methods described in the foregoing embodiments.
  • the processing circuit is used to execute the processing action in the corresponding method
  • the transceiver circuit is used to execute the receiving/sending action in the corresponding method.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state drive (solid state drive, SSD)) wait.
  • a magnetic medium for example, a floppy disk, a hard disk, a tape
  • an optical medium for example, a digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state drive (solid state drive, SSD)
  • the disclosed system, device and method can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the modules is only a logical function division. In actual implementation, there may be other division methods.
  • multiple modules or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or modules may be in electrical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple devices. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande, qui relève du domaine technique des communications sans fil, concerne un procédé et un appareil de communication, capables d'éviter le problème d'une défaillance TAU, de faciliter le raccourcissement du temps de déconnexion au réseau d'un dispositif terminal et de réduire la consommation d'énergie du dispositif terminal. Le procédé comprend les étapes suivantes : une seconde unité de réseau détermine qu'un troisième réseau mobile terrestre public (PLMN) desservant le dispositif terminal appartient à un premier réseau PLMN, la seconde unité de réseau étant une unité de réseau dans un réseau PLMN résidentiel du dispositif terminal, il y a au moins un premier réseau PLMN et le premier réseau PLMN est différent du réseau PLMN résidentiel du dispositif terminal ; la seconde unité de réseau n'envoie pas un premier paramètre cible au dispositif terminal, ou la seconde unité de réseau envoie des informations d'indication au dispositif terminal, les informations d'indication indiquant la suppression du premier paramètre cible, et le premier paramètre cible comprenant un paramètre d'une session d'unité de données de protocole (PDU) dans un premier mode de communication mappé à un second mode de communication.
PCT/CN2022/140007 2022-01-30 2022-12-19 Procédé et appareil de communication WO2023142777A1 (fr)

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CN108323245A (zh) * 2017-06-19 2018-07-24 华为技术有限公司 一种注册及会话建立的方法、终端和amf实体
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