WO2020001226A1 - 重定向的方法、通信系统和通信装置 - Google Patents

重定向的方法、通信系统和通信装置 Download PDF

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Publication number
WO2020001226A1
WO2020001226A1 PCT/CN2019/089162 CN2019089162W WO2020001226A1 WO 2020001226 A1 WO2020001226 A1 WO 2020001226A1 CN 2019089162 W CN2019089162 W CN 2019089162W WO 2020001226 A1 WO2020001226 A1 WO 2020001226A1
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WO
WIPO (PCT)
Prior art keywords
redirection
message
ciot
network element
terminal
Prior art date
Application number
PCT/CN2019/089162
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English (en)
French (fr)
Inventor
朱强华
朱奋勤
吴问付
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19825389.0A priority Critical patent/EP3813429A4/en
Priority to KR1020217002035A priority patent/KR102463970B1/ko
Priority to JP2020572882A priority patent/JP7135122B2/ja
Publication of WO2020001226A1 publication Critical patent/WO2020001226A1/zh
Priority to US17/132,947 priority patent/US11523310B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • 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
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00222—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0064—Transmission or use of information for re-establishing the radio link of control information between different access points
    • 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
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network

Definitions

  • the present application relates to the field of communications, and more particularly, to a redirection method, a communication system, and a communication device.
  • CIOT Cellular Internet of Things
  • NB-IoT narrowband Internet of Things
  • eMTC enhanced machine communication
  • a typical CIOT system is an evolved packet system (EPS).
  • EPS evolved packet system
  • 3GPP 3rd Generation Partnership Project
  • 5GS 5th generation mobile communication system
  • CIOT terminals that support the CIOT 5GS feature and the CIOT EPS feature can access the EPS or 5GS.
  • 5GC 5th generation system core
  • the 5GC can redirect the CIOT terminal to an evolved packet core network (EPC) according to the operator's policy or load balancing requirements.
  • EPC evolved packet core network
  • the EPC can redirect the CIOT terminal to the 5GC according to the operator's policy or load balancing requirements.
  • EPC evolved packet core network
  • the present application provides a redirection method, a communication system, and a communication device, which can implement redirection of a terminal between different systems, and further, can implement redirection between 5GS and EPS.
  • the present application provides a redirection method, which includes: the mobile management network element of the first system determines to redirect the terminal to the CIOT feature supported by the terminal in the second system and the preferred CIOT feature The second system. Then, the mobility management network element of the first system sends redirection indication information to the access network element of the first system, where the redirection indication information is used to instruct the access network element of the first system to redirect all network elements. The terminal is redirected from the first system to the second system.
  • the mobility management network element of the first system receives a handover request message from an access network element of the first system, wherein the handover request message includes first indication information, and the first indication information is used for The reason for instructing to send the handover request message is a redirection request of the first system. Then, the mobility management network element of the first system selects the mobility management network element of the second system according to the handover demand message, and sends the first message to the mobility management network element of the second system, so that The first message is used to request to switch the terminal to the second system.
  • the first system may be 5GS (or 5GC), and the second system may be EPS (or 5GC).
  • the first system may be EPS (or EPC), and the second system may be 5GS (or EPC).
  • 5GS and EPS are taken as examples, but this application is not limited thereto.
  • the first indication information is specifically a redirection to an EPC indication (Redirect to EPC Indication); or the first indication information is specifically a redirection to a 5GC indication (Redirect to 5GC Indication); or, the The first instruction information is specifically a redirection instruction (CIOT Inter-RAT Rediretion or Inter CIOT, RAT Redirection) between different CIOT radio access technologies (RATs); or the first instruction information is specifically a different CIOT system Redirection instructions (CIOT Inter-System Rediretion or Inter-CIOT System Redirection).
  • CIOT Inter-RAT Rediretion or Inter CIOT, RAT Redirection CIOT Inter-System Rediretion or Inter-CIOT System Redirection
  • the mobility management network element of the first system when it determines that it is necessary to trigger the terminal to redirect to the second system, it sends redirection indication information to the access network network element of the first system. After receiving the redirection indication information, the access network element of the first system sends a handover request message to the mobility management network element of the first system. After receiving the handover request message from the mobile management network element of the first system, the mobile management network element of the second system sends the first message to the mobile management network element of the second system to start the handover, so that the terminal can be switched from the first system to the second system. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem between two different systems.
  • the problem of redirection of the terminal from the EPS to the 5GS can be solved.
  • the first system is 5GS and the second system is EPS
  • the problem of redirection of the terminal from 5GS to EPS can be solved.
  • terminal involved in this application may be a CIOT terminal.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be sent by the terminal to the mobile management network element of the first system.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be through a registration request message, an attach request message, or a tracking area update (TAU) request.
  • TAU tracking area update
  • this application is not limited to this.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be carried by a registration request message.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be carried in an attach request message or a TAU request message.
  • the terminal may also send the CIOT feature and the preferred CIOT feature supported by the terminal in the first system to the mobile management network element of the first system, so that the terminal may combine the CIOT feature and the preferred CIOT feature supported by the terminal in the first system.
  • the CIOT feature is registered to the mobility management network element of the first system.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the first system may be carried by a registration request message, an attachment request message, or a TAU request message.
  • the preferred CIOT characteristic of the terminal in the second system is one or more CIOT characteristics of the CIOT characteristics supported by the terminal in the second system.
  • the preferred CIOT characteristic of the terminal in the first system is one or more CIOT characteristics of the CIOT characteristics supported by the terminal in the first system.
  • the CIOT characteristics may be, for example, control plane (CP) optimization and user plane (UP) optimization.
  • the CIOT characteristics supported by the terminal may be one of CP optimization and UP optimization. , Or both.
  • CP control plane
  • UP user plane
  • the present application is not limited to specifically limit the characteristics of CIOT.
  • CIOT characteristics can be EPS optimization and EPS optimization.
  • CIOT characteristics can be other characteristics.
  • the redirection indication information may be sent through an N2 message, such as an N2 notify message, an initial UE context setup message, and a UE context modification. (UE Context Modification) message, UE Context Release message, or Downlink Transport message.
  • the redirection indication information may be sent through an S1 application layer (S1 application plane (S1-AP) message, for example, an S1-AP notification message, an Initial UE Context Setup message, and a UE context modification ( UE Context Modification) message, UE Context Release message, or Downlink Transport message.
  • S1 application layer S1 application plane (S1-AP) message
  • S1-AP S1 application layer
  • S1-AP S1 application plane
  • UE Context Modification UE Context Modification
  • the redirection indication information may be sent through an S1-AP message.
  • N2 is the interface between the 5GS mobile management network element and the 5GS access network network element
  • S1-AP is the interface between the EPS mobile management network element and the EPS access network network element.
  • the first message may be a relocation request message or a relocation complete message, but the embodiment of the present application is not limited thereto.
  • the first message includes second instruction information
  • the second instruction information is used to enable a mobile management network element of the second system to perform the operation according to the second instruction.
  • Information the terminal is no longer redirected to the first system.
  • the redirection method in the embodiment of the present application can prevent the terminal from being redirected from the target system (that is, the second system) back to the source system (that is, the first system).
  • the second indication information is specifically a 5GC redirection indication (Redirect from 5GC Indication); or the EPC redirection indication (Redirect from EPC Indication); or the second indication information is specifically a different CIOT RAT.
  • Inter-redirection indication CIOT Inter-RAT Rediretion or Inter-RAT Redirection
  • the second indication information is specifically a redirect indication (CIOT Inter-System Rediretion or Inter-CIOT Redirection) between different CIOT systems.
  • the first system is 5GS and the second system is EPS
  • the second instruction information is specifically a 5GC redirection indication (Redirect from 5GC Indication).
  • the second indication information is specifically a Redirect from EPC Indication.
  • the present application provides a redirection method.
  • the method includes: an access network element of the first system receives redirection indication information sent by a mobile management network element of the first system; and access of the first system After receiving the redirection instruction information, the network element sends a handover request message to the mobile management network element of the first system, where the handover request message includes first instruction information, and the first instruction information is used to instruct the sending of the redirection information.
  • the reason for the handover request message is a redirection request of the first system.
  • the first indication information is specifically a redirection to an EPC indication (Redirect to EPC Indication); or the first indication information is specifically a redirection to a 5GC indication (Redirect to 5GC Indication); or, the The first indication information is specifically a redirection indication between different CIOT and RAT (CIOT, Inter-RAT, Rediretion, or Inter-CIOT, RAT Redirection); or the first indication information is specifically a redirection indication between different CIOT systems Rediretion or Inter-CIOT System Redirection).
  • the redirection indication information may be sent through an N2 message, such as an N2 notify message, an Initial UE Context Setup message, a UE Context Modification message, and a UE Context Release ) Message, or a Downlink Transport message.
  • the redirection indication information may be sent through an S1 application layer (S1 application plane (S1-AP) message, for example, an S1-AP notification message, an Initial UE Context Setup message, and a UE context modification ( UE Context Modification) message, UE Context Release message, or Downlink Transport message.
  • S1 application layer S1 application plane (S1-AP) message
  • S1-AP application plane
  • UEContext Modification UE Context Modification
  • UE Context Release message UE Context Release message
  • the redirection indication information may be sent through an N2 message.
  • the redirection indication information may be sent through an S1-AP message.
  • N2 is the interface between the 5GS mobile management network element and the 5GS access network network element
  • S1-AP is the interface between the EPS mobile management network element and the EPS access network network element.
  • the redirection method in the embodiment of the present application when the mobility management network element of the first system determines that it is necessary to trigger the terminal to redirect to the second system, it sends redirection indication information to the access network network element of the first system.
  • the network element of the access network of the first system receives the redirection instruction message and sends a handover request message to the mobile management network element of the first system to trigger the handover process and switch the terminal from the first system to the second system. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem between two different systems.
  • the first system is an EPS and the second system is a 5GS
  • the problem of redirection of the terminal from the EPS to the 5GS can be solved.
  • the first system is 5GS and the second system is EPS
  • the problem of redirection of the terminal from 5GS to EPS can be solved.
  • a redirection method includes: a terminal receiving redirection instruction information, the redirection instruction information being used to instruct the terminal to redirect to a second system, and the terminal redirecting to The second system is determined according to a cellular IoT CIOT characteristic and a preferred CIOT characteristic supported by the terminal in the second system. Then, the terminal selects the second system according to the redirection indication information. Then, the terminal sends a second message to the second system, where the second message is used to request access to the second system.
  • the terminal after receiving the redirection instruction information, the terminal can perform an access process to the second system by sending a second message to the mobile management network element of the second system, so that the terminal can The terminal accesses the second system. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem between two different systems.
  • the first system is an EPS and the second system is a 5GS
  • the problem of redirection of the terminal from the EPS to the 5GS can be solved.
  • the first system is 5GS and the second system is EPS
  • the problem of redirection of the terminal from 5GS to EPS can be solved.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be sent by the terminal to the mobile management network element of the first system.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be through a registration request message, an attach request message, or a tracking area update (TAU) request.
  • TAU tracking area update
  • this application is not limited to this.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be carried by a registration request message.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the second system may be carried in an attach request message or a TAU request message.
  • the terminal may also send the CIOT feature and the preferred CIOT feature supported by the terminal in the first system to the mobile management network element of the first system, so that the terminal may combine the CIOT feature and the preferred
  • the CIOT feature is registered to the mobility management network element of the first system.
  • the CIOT feature and the preferred CIOT feature supported by the terminal in the first system may be carried by a registration request message, an attachment request message, or a TAU request message.
  • the preferred CIOT characteristic of the terminal in the second system is one or more CIOT characteristics of the CIOT characteristics supported by the terminal in the second system.
  • the preferred CIOT characteristic of the terminal in the first system is one or more CIOT characteristics of the CIOT characteristics supported by the terminal in the first system.
  • the CIOT characteristics may be, for example, control plane (CP) optimization and user plane (UP) optimization.
  • the CIOT characteristics supported by the terminal may be one of CP optimization and UP optimization. , Or both.
  • CP control plane
  • UP user plane
  • the present application is not limited to specifically limit the characteristics of CIOT.
  • CIOT characteristics can be EPS optimization and EPS optimization.
  • CIOT characteristics can be other characteristics.
  • the receiving the redirection indication information by the terminal specifically includes: receiving, by the terminal, the redirection indication information from a mobile management network element of the first system.
  • the mobility management network element of the first system may directly send the redirection indication information to the terminal.
  • the mobility management network element of the first system may send the redirection information to the terminal through a non-access-stratum (NAS) message.
  • NAS non-access-stratum
  • the redirection indication information may be sent to the UE through a process such as deregistration, registration, UE configuration, detach, attach, or TAU. Carried in the NAS message.
  • the redirection indication information may be carried by a message such as a registration response message, a deregistration request message, or a UE configuration update command message.
  • the redirection indication information may be carried by a message such as an attach response message, a detach request message, or a TAU response message.
  • the receiving the redirection indication information by the terminal specifically includes: receiving, by the terminal, the redirection indication information from an access network element of the first system.
  • the mobility management network element of the first system may send the redirection indication information to the access network element of the first system, and then, the access network element of the first system sends the redirection indication to the terminal. information.
  • the mobility management network element of the first system may send the redirection indication information to the access network element of the first system through the N2 message or the S1-AP message, and then the access network element of the first system passes the redirection information.
  • the message sent to the terminal in the AN release process or the S1 release process or the handover process carries the redirection indication information.
  • the N2 message may be, for example, a N2 notify message, an Initial UE Context Setup message, a UE Context Modification message, a UE Context Release message, or a Downlink Transport ) Message, etc.
  • the S1-AP message may be, for example, a S1-AP notification message, an Initial UE Context Setup message, a UE Context Modification message, a UE Context Release message, or downlink Transport (Downlink, Transport) messages.
  • the message sent by the access network element of the first system to the terminal in the AN release process may be, for example, an AN Connection Release message.
  • the AN release process is an AN release (AN release through inter-system redirection to EPS) process that is redirected to the EPS through the system.
  • AN release process refers to the reference technology, which is not described in this application.
  • the message sent by the access network element of the first system to the terminal in the S1 release process may be, for example, an RRC Connection Release message.
  • RRC Connection Release message For the S1 release process, please refer to the reference technology, which will not be repeated here in this application.
  • the message sent by the access network element of the first system to the terminal in the handover process may be, for example, a handover command (Handover Comman) message.
  • the switching process is a switching process from EPS to 5GS.
  • the process of switching from EPS to 5GS please refer to the reference technology, which will not be repeated here.
  • the second message includes third indication information, where the third indication information is used to indicate that the reason for sending the second message is a redirection request of the first system So that the mobile management network element of the second system no longer redirects the terminal to the first system according to the third instruction information. Therefore, it is possible to prevent the terminal from being redirected to the second system and then redirected back to the first system.
  • the third indication information is specifically a 5GC redirection indication (Redirect from 5GC Indication) or an EPC redirection indication (Redirect from EPC Indication); or the third indication information is specifically between different CIOT RATs.
  • Redirection indication CIOT Inter-RAT Rediretion or Inter-CIOT RAT Redirection
  • the third indication information is specifically a redirection indication (CIOT Inter-System Rediretion or Inter-CIOT System Redirection) between different CIOT systems.
  • the second message may be a registration request message, an attachment request message, or a TAU request message.
  • the second message may be an Attach request message or a TAU request message.
  • the first system is an EPS and the second system is a 5GS
  • the second message may be a registration request message.
  • the terminal disables a CIOT feature supported by the terminal in the first system. Therefore, it is possible to prevent the terminal from being redirected to the second system and then redirected back to the first system.
  • the second message does not include a CIOT feature and a preferred CIOT feature supported by the terminal in the first system, so that the second system is configured according to the second Message, no longer redirecting the terminal to the first system. Therefore, it is possible to prevent the terminal from being redirected to the second system and then redirected back to the first system.
  • a redirection method includes: an access network element of the first system receives redirection indication information sent by a mobile management network element of the first system; and an access network network of the first system The meta sends the redirection indication information to the terminal.
  • the mobility management network element of the first system may send the redirection indication information to the access network element of the first system through an N2 message or an S1-AP message, and then the access network element of the first system passes The message sent to the terminal in the AN release process or the S1 release process or the handover process carries the redirection indication information.
  • the access network element of the first system may send the redirection instruction information to the terminal, thereby triggering the terminal to perform an access process to access the first Two systems. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem between two different systems.
  • the first system is an EPS and the second system is a 5GS
  • the problem of redirection of the terminal from the EPS to the 5GS can be solved.
  • the first system is 5GS and the second system is EPS
  • the problem of redirection of the terminal from 5GS to EPS can be solved.
  • a communication system including a mobility management network element of the first system and an access network network element of the first system.
  • the mobile management network element of the first system is configured to determine to redirect the terminal to the second system according to the CIOT characteristic of the cellular IoT supported by the terminal in the second system and the preferred CIOT characteristic, and to The access network element of the first system sends redirection indication information, and the redirection indication information is used to instruct the access network element of the first system to redirect the terminal from the first system to The second system.
  • the network element of the access network of the first system is configured to receive redirection indication information from a mobility management network element of the first system, and send a handover request message to the mobility management network element of the first system.
  • the mobility management network element of the first system is further configured to:
  • the handover demand message includes first indication information, where the first indication information is used to indicate that a reason for sending the handover demand message is a redirection request of the first system;
  • the first message includes second indication information
  • the second indication information is used by a mobile management network element of the second system according to the second indication information , The terminal is no longer redirected to the first system.
  • a communication system including a terminal and a mobile management network element of the first system.
  • the mobile management network element of the first system is used to: determine to redirect the terminal to the second system according to the cellular IoT CIOT characteristic and the preferred CIOT characteristic supported by the terminal in the second system;
  • the terminal sends redirection instruction information, and the redirection instruction information is used to instruct the terminal to redirect to the second system.
  • the terminal is configured to: receive the redirection indication information from a mobile management network element of the first system; and send a second message to the mobile management network element of the second system, where the second message is For requesting access to the second system.
  • the system further includes an access network element of the first system; the mobility management network element of the first system is used for:
  • the second message includes third indication information
  • the third indication information is used to indicate that the reason for sending the second message is a re-start of the first system. Direct the request so that the mobile management network element of the second system no longer redirects the terminal to the first system according to the third instruction information.
  • the terminal is further configured to disable a CIOT feature supported by the terminal in the first system. Therefore, it is possible to prevent the terminal from being redirected to the second system and then redirected back to the first system.
  • the second message does not include the CIOT feature supported and preferred by the terminal in the first system, so that the mobile management network element of the second system is based on The second message no longer redirects the terminal to the first system.
  • a communication apparatus for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect.
  • the apparatus includes a unit for performing the foregoing first aspect or the method in any possible implementation manner of the first aspect.
  • a communication device for performing the foregoing second aspect or the method in any possible implementation manner of the second aspect.
  • the apparatus includes a unit for performing the method in the second aspect or any possible implementation manner of the second aspect.
  • a communication apparatus for performing the foregoing third aspect or the method in any possible implementation manner of the third aspect.
  • the apparatus includes a unit for performing the foregoing third aspect or the method in any possible implementation manner of the third aspect.
  • a communication apparatus for performing the foregoing fourth aspect or the method in any possible implementation manner of the fourth aspect.
  • the apparatus includes a unit for performing the foregoing fourth aspect or the method in any possible implementation manner of the fourth aspect.
  • another communication device includes a transceiver, a memory, and a processor.
  • the transceiver, the memory, and the processor communicate with each other through an internal connection path.
  • the memory is used to store instructions.
  • the processor is used to execute the instructions stored in the memory to control the receiver to receive signals and the transmitter to send signals. , So that the apparatus executes the method in any one of the possible implementation manners of the first aspect to the fourth aspect or the first aspect to the fourth aspect.
  • the device includes a processor.
  • the processor is configured to be coupled to the memory, and after reading an instruction in the memory, execute the first to fourth aspects according to the instruction. Method in any aspect or any possible implementation manner of the first aspect to the fourth aspect.
  • a computer program product includes computer program code that, when the computer program code is executed by a computer, causes the computer to execute a method in any possible implementation manner of any of the foregoing aspects. .
  • a computer-readable medium for storing a computer program, the computer program including instructions for performing a method in any possible implementation manner of any of the above aspects.
  • a communication chip in which instructions are stored that, when run on a computer device, cause the communication chip to perform a method in any possible implementation manner of any of the above aspects.
  • FIG. 1 is a schematic diagram of a system architecture applied to the present application.
  • FIG. 2 is a schematic diagram of another system architecture applied in the present application.
  • FIG. 3 is a schematic diagram of the EPS.
  • Figure 4 is a simplified architecture diagram of 5GS.
  • Figure 5 is a schematic diagram of the 5GS architecture.
  • FIG. 6 is a schematic flowchart of a redirection method provided by the present application.
  • FIG. 7 is a schematic flowchart of a redirection method provided by the present application.
  • FIG. 8 is a schematic flowchart of another redirection method provided in the present application.
  • FIG. 9 is a schematic flowchart of another redirection method provided in the present application.
  • FIG. 10 is a schematic flowchart of still another redirection method provided in the present application.
  • FIG. 11 is a schematic flowchart of still another redirection method provided by the present application.
  • FIG. 12 is a schematic structural diagram of a communication device provided by the present application.
  • FIG. 13 is a schematic structural diagram of another communication device provided by the present application.
  • FIG. 14 is a schematic structural diagram of a device provided by the present application.
  • FIG. 1 shows a schematic diagram of a system architecture 100 applied in the present application.
  • the system architecture 100 includes: a mobility management network element 110 and an access network network element 120.
  • the system architecture 100 may further include a mobile management network element 130 and a terminal 140.
  • the mobility management network element 110 is a mobility management network element of the first system
  • the access network network element 120 is an access network network element of the first system
  • the mobility management network element 130 is a mobility management network element of the second system.
  • the first system and the second system are different systems.
  • the first system may be 5GS and the second system is EPS; or, the first system may be EPS and the second system is 5GS. It should be understood that the first system and the second system may also be other systems, which are not limited in this application.
  • the system architecture 100 described above may be used to perform a redirection method provided in this application.
  • the mobility management network element 110 is specifically configured to: determine to redirect the terminal to the second system according to the CIOT characteristic and the preferred CIOT characteristic supported by the terminal in the second system; and send the redirection to the access network element 120 Instruction information, the redirection instruction information is used to instruct the access network element 120 to redirect the terminal from the first system to the second system; receive a handover request message from the mobile management network element 110; and according to the The handover request message selects the mobile management network element 130; and sends a first message to the mobile management network element 130, where the first message is used to request the terminal to be switched to the second system.
  • the access network element 130 is configured to: receive redirection indication information from the mobility management network element 110; and send a handover request message to the mobility management network element 110.
  • the mobility management network element 130 is configured to receive the first message from the mobility management network element 110.
  • the mobility management network element 110 may instruct the access network element 120 to trigger the handover process by using the redirection instruction information.
  • the access network element 120 may trigger an inter-system (inter-radio access technology, inter-RAT) handover (HO) by sending a handover request message to the mobile management network element 130 to switch the terminal from the first system to the first.
  • inter-system inter-radio access technology, inter-RAT
  • HO inter-radio access technology
  • the foregoing terminal 140 may be a terminal in a connected state, and the mobile management network element 120 and the mobile management network element 130 may communicate through an N26 interface, but this is not limited in the embodiment of the present application.
  • the terminal 140 is configured to: send to the mobile management network element 110 the CIOT feature and the preferred CIOT feature supported by the terminal in the second system.
  • the mobile management network element 110 is configured to receive the CIOT feature and the preferred CIOT feature supported by the terminal in the second system from the terminal 140.
  • the terminal 140 is further configured to send to the mobile management network element 130 the CIOT feature and the preferred CIOT feature supported by the terminal in the first system.
  • the mobile management network element 130 is configured to receive the CIOT feature and the preferred CIOT feature supported by the terminal in the first system from the terminal 140.
  • the handover demand message may include first indication information, where the first indication information is used to indicate that the reason for sending the handover demand message is a redirection request of the first system.
  • the first indication information is specifically a redirection to an EPC indication (Redirect to EPC Indication); or the first indication information is specifically a redirection to a 5th generation mobile communication system core network 5GC indication (Redirect to 5GC Indication)
  • the first indication information is specifically a redirection indication CIOT (Inter-RAT Rediretion or InterCIOT) Redirection between different CIOTs; or the first indication information is specifically a redirection indication CIOT between different CIOT systems. Inter-System Rediretion or Inter-CIOT System Redirection.
  • the first message includes second indication information
  • the second indication information is used to cause the mobile management network element 130 to no longer redirect the terminal to the first system according to the second indication information.
  • the second instruction information is specifically a 5GC redirection indication from the fifth generation mobile communication system core network (Redirect from 5GC Indication), or the second instruction information is specifically an EPC redirection instruction from an evolved packet core network. (Redirect from EPC Indication)
  • the second indication information is specifically a redirection indication CIOT Inter-RAT Rediretion or Inter CIOT Redirection between different CIOTs; or the second indication information is specifically between different CIOT systems Redirection indicates CIOT Inter-System Rediretion or InterCIOT System Redirection.
  • FIG. 2 shows a schematic diagram of a system architecture 200 provided by the present application.
  • the system architecture 200 includes a terminal 210 and a mobile management network element 220.
  • the system architecture 200 may further include an access network element 230.
  • the mobility management network element 220 is a mobility management network element of the first system
  • the access network network element 230 is an access network network element of the first system.
  • the first system and the second system are different systems.
  • the first system may be 5GS and the second system is EPS; or, the first system may be EPS and the second system is 5GS. It should be understood that the first system and the second system may also be other systems, which are not limited in this application.
  • the system architecture 200 described above may be used to perform another redirection method provided in this application.
  • the mobile management network element 220 is configured to: determine to redirect the terminal to the second system according to the CIOT characteristic and the preferred CIOT characteristic supported by the terminal in the second system; and send redirection indication information to the terminal The redirection indication information is used to instruct the terminal to redirect to the second system.
  • the terminal 210 is configured to receive redirection instruction information, where the redirection instruction information instructs the terminal to redirect to the second system, and the redirection of the terminal to the second system is based on the second system.
  • the CIOT characteristics and preferred CIOT characteristics supported by the terminal are determined; the second system is selected according to the redirection indication information; and a second message is sent to the second system, the second message is used to request access To the second system.
  • the mobility management network element 220 may send the redirection indication information to the terminal 210. After receiving the redirection instruction information, the terminal may select the second system, and then access the selected second system.
  • the problem of redirection between two different systems can be solved.
  • the first system is an EPS and the second system is a 5GS
  • the problem of redirection of the terminal from the EPS to the 5GS can be solved.
  • the first system is 5GS and the second system is EPS
  • the problem of redirection of the terminal from 5GS to EPS can be solved.
  • the mobility management network element 220 is configured to send redirection indication information to the terminal, and specifically includes: the mobility management network element sends the redirection indication information to the access network element 230, and then The access network element 230 sends the redirection indication information to the terminal.
  • the access network element 230 needs to de-encapsulate the redirection indication information sent by the mobility management network element 220, and then sends it to the terminal 210.
  • the mobility management network element may send the redirection indication information to the access network element 230 through the N2 message or the S1-AP message, and then the access network element may send the redirection information to the network through the AN release process or the S1 release process.
  • the message sent by the terminal carries the redirection indication information.
  • the mobile management network element 220 directly sends the redirection indication information to the terminal.
  • the meaning here is that the access network element 230 does not process the redirection indication information, and only performs a simple forwarding operation.
  • the terminal 210 is further configured to send the CIOT feature and the preferred CIOT feature supported by the terminal in the second system to the mobile management network element 220.
  • the mobile management network element 220 is configured to: receive from the terminal 210 a CIOT characteristic and a preferred CIOT characteristic supported by the terminal in the second system
  • the second message includes third indication information, and the third indication information is used to indicate that the reason for sending the second message is a redirection request of the first system, so that the second system moves The management network element no longer redirects the terminal to the first system according to the third instruction information.
  • the third indication information is specifically a 5GC redirection indication from the core network of the fifth generation mobile communication system (Redirect from 5GC Indication); or the third indication information is specifically an EPC redirection from the evolved packet core network Redirect from EPC Indication; or, the third indication information is specifically a redirect indication CIOT Inter-RAT Rediretion or Inter CIOT RAT Redirection between different CIOTs; or the third indication information is specifically a different CIOT system Inter-redirection indicates CIOT Inter-System Rediretion or Inter-CIOT System Redirection.
  • the terminal disables a CIOT feature supported by the terminal in the first system.
  • the second message does not include the CIOT feature and the preferred CIOT feature supported by the terminal in the first system, so that the mobile management network element of the second system no longer repeats according to the second message. Orienting the terminal to the first system.
  • the terminal in the embodiment of the present application may refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal , Wireless communication equipment, user agent, or user device.
  • the terminal can also be a cell phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Processing (PDA), and a wireless communication function.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Processing
  • PLMN Public Land Mobile Network
  • the terminal in this application may be a CIOT terminal.
  • CIOT terminals have the application characteristics of low cost, simple functions, low power consumption, and infrequent user data transmission.
  • FIG. 3 shows an architectural diagram 300 of the EPS. As shown in FIG. 3, the architecture diagram 300 may specifically include the following network entities:
  • Evolved universal terrestrial wireless network A network composed of multiple evolved base stations (Evolved NodeB, eNodeB), which implements the wireless physical layer functions, resource scheduling, wireless resource management, and wireless access. Access control and mobility management functions.
  • the eNodeBs can be connected through the X2 interface, and can be used to transmit data during the X2-based handover process.
  • the eNodeB is connected to the serving network element (SGW) through the user plane interface S1-U, and uses the general packet radio system tunneling protocol user plane (general packet radio system, general tunneling, protocol, user plane, and GTP-U) to transmit user data;
  • the control plane interface S1-MME is connected to a mobility management entity (MME) and uses the S1-AP protocol to implement functions such as wireless access bearer control.
  • MME It is mainly responsible for all control plane functions of users, ie session management, including non-access-stratum (NAS) signaling and security, management of tracking area list, and packet data. Selection of network gateway (packet date network gateway, P-GW) and SGW.
  • NAS non-access-stratum
  • SGW It is mainly responsible for data transmission, forwarding, and routing switching of user equipment, and serves as the local mobility anchor point for user equipment when switching between eNodeBs (for each user equipment, there is only one SGW at each time. service).
  • P-GW As the anchor point of the packet data network (packet date network, PDN) connection, it is responsible for the IP address allocation of the user equipment, data packet filtering, rate control, and charging information generation of the user equipment.
  • Serving GPRS support node 2G access network GSM / EDGE wireless access network (GSM / EDGE radio access network, GERAN), 3G access network universal terrestrial wireless access network (universal Terrestrial (radio access network, UTRAN) and the access node of the EPS core network EPC are responsible for the establishment and data forwarding of the EPC bearer from GERAN, UTRAN.
  • GSM / EDGE wireless access network GSM / EDGE radio access network, GERAN
  • 3G access network universal terrestrial wireless access network Universal Terrestrial (radio access network, UTRAN)
  • the access node of the EPS core network EPC are responsible for the establishment and data forwarding of the EPC bearer from GERAN, UTRAN.
  • HSS Home subscriber server
  • PCRF Policy and charging rules function
  • FIG. 4 is a diagram 400 showing a 5GS architecture.
  • 5GS is composed of UE, (radio access network (R) AN), core network (Core), and data network (DN).
  • R radio access network
  • Core core network
  • DN data network
  • UE, AN, and Core are the main components of the architecture. Logically, they can be divided into two parts: user plane and control plane.
  • the control plane is responsible for the management of the mobile network
  • the user plane is responsible for the transmission of business data.
  • the NG2 reference point is located between the AN control plane and the Core control plane
  • the NG3 reference point is located between the AN user plane and the Core user plane
  • the NG6 reference point is located between the Core user plane and the data network.
  • UE It is a portal for mobile users to interact with the network. It can provide basic computing capabilities, storage capabilities, display business windows to users, and accept user input. The UE will use the next-generation air interface technology to establish a signal connection and data connection with the AN to transmit control signals and service data to the mobile network.
  • AN Similar to a base station in a traditional network, it is deployed close to the UE and provides network access functions for authorized users in specific areas. It can use different quality transmission tunnels to transmit user data according to the user's level and business needs.
  • the AN can manage its own resources, make reasonable use, provide access services for the UE as needed, and forward control signals and user data between the UE and the core network.
  • Core responsible for maintaining the contract data of the mobile network, managing the network elements of the mobile network, and providing the UE with session management, mobility management, policy management, security authentication and other functions.
  • the DN It is a data network that provides business services to users.
  • the client is located in the UE and the server is located in the data network.
  • the data network can be a private network, such as a local area network, or an external network that is not controlled by the operator, such as the Internet, or a private network that is jointly deployed by the operator, such as to configure the IP multimedia network subsystem (IP multimedia network core network subsystem, IMS) services.
  • IP multimedia network subsystem IP multimedia network core network subsystem, IMS
  • Figure 5 is the detailed architecture determined on the basis of Figure 4, where the core network user plane includes user plane functions (UPF); the core network control plane includes authentication server functions (AUSF), and the core network interface Core access and mobility management function (AMF), session management function (SMF), network slice selection function (NSSF), network open function (Network Exposure Function, NEF) ) Network Function Storage Function (NF, Repository Function, NRF), Unified Data Management (UDM), Policy Control Function (PCF), Application Function (AF).
  • UPF user plane functions
  • AUSF authentication server functions
  • AMF core network interface Core access and mobility management function
  • SMF session management function
  • NSSF network slice selection function
  • NEF Network Exposure Function
  • NEF Network Exposure Function
  • NF Network Function Storage Function
  • NRF Unified Data Management
  • PCF Policy Control Function
  • AF Application Function
  • UPF performs user packet forwarding according to the routing rules of SMF
  • AMF UE access management and mobility management
  • SMF UE Session Management
  • NSSF Select network slice for UE
  • NEF Open network functions to third parties with a northbound API interface
  • NRF Provides storage and selection functions of network function entity information for other network elements
  • the N1 interface is the reference point between the UE and the AMF; the N2 interface is the reference point for (R) AN and AMF for NAS message transmission, etc .; the N3 interface is the (R) AN and UPF The reference point between them is used to transmit user plane data, etc .; the N4 interface is a reference point between SMF and UPF, and is used to transmit information such as tunnel identification information for N3 connections, data cache indication information, and downlink data notification messages. ; N6 interface is the reference point between UPF and DN, used to transmit user plane data and so on.
  • the interface names between the network elements in FIG. 3 to FIG. 5 are only examples, and the names of the interfaces in the specific implementation may be other names, which are not specifically limited in the embodiment of the present application.
  • the names of the various network elements (such as SMF, AF, UPF, etc.) included in FIG. 1 to FIG. 5 are only examples, and the functions of the network elements themselves are not limited. In the 5G network and other networks in the future, the foregoing network elements may also have other names, which are not specifically limited in this embodiment of the present application.
  • the first system in the redirection method provided in this application may be one of the EPS shown in FIG. 3 and the 5GS shown in FIG. 5, and the second system may be the EPS shown in FIG. 3 and the one shown in FIG. 5.
  • Another system in 5GS Specifically, the first system in this application may be EPS, and accordingly, the second system is 5GS.
  • the first system in this application may also be 5GS, and accordingly, the second system is EPS. It should be understood that this application does not exclude the possibility that the first system and the second system may also be other existing systems or future systems.
  • the mobility management network element of the first system in this application may be an MME
  • the mobility management network element of the second system may be AMF
  • the network element may be one or more eNodeBs in EUTRAN or EUTRAN
  • the network element in the access network of the second system may be (R) AN.
  • each network element in this application is a corresponding network element in these systems.
  • the terminal in this application may be a UE in the system described above.
  • the redirection of the terminal from 5GS to EPS and the terminal from EPS to 5GS are taken as examples below to describe the redirection of this application in detail.
  • the first system is 5GS
  • the second system is EPS
  • the terminal is UE
  • the mobility management network element of the first system is AMF
  • the mobility management network element of the second system Is the MME
  • the access network element of the first system is S-RAN
  • the access network element of the second system is T-RAN.
  • the terminal is redirected from EPS to 5GS
  • the terminal is UE
  • the first system is EPS
  • the second system is 5GS
  • the mobility management network element of the first system is MME
  • the mobility management network element of the second system is AMF
  • the access network element of the first system is S-RAN
  • the access network element of the second system is T-RAN.
  • FIGS. 6 and 7 illustrate a redirection method provided by the present application.
  • the method shown in FIG. 6 may be applied to a scenario where the UE is redirected from 5GS to EPS
  • the method shown in FIG. 7 may be applied to a scenario where the UE is redirected from EPS to 5GS.
  • the methods shown in FIG. 6 and FIG. 7 can be applied to a UE in a connected state, and the AMF and the MME can communicate through an N26 interface, but this embodiment of the present application does not limit this. It should be understood that the methods shown in FIGS. 6 and 7 may be applied to the system architecture 100 described above.
  • FIG. 6 is a schematic flowchart of a redirection method 600 according to an embodiment of the present application.
  • the method 600 mainly includes S604 to S612 described below.
  • the method 600 may further include S602, S614, and / or S616.
  • the UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the EPS to the AMF.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the EPS may be registered in the AMF.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the EPS may be carried by a registration request message in a registration process.
  • the UE may also send the CIOT features and preferred CIOT features supported by the UE in the 5GS to the AMF, so that the UE may register the CIOT features and preferred CIOT features supported by the UE in the 5GS with the AMF.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS may be carried through the registration request message.
  • the CIOT feature supported by the UE in the EPS is also referred to as the EPS CIOT capability of the UE.
  • the CIOT feature supported by the UE in 5GS is also referred to as the 5GS CIOT capability of the UE.
  • the CIOT characteristic may be, for example, CP optimization and UP optimization.
  • the CIOT characteristic supported by the UE may be one of CP optimization and UP optimization, or both.
  • the present application is not limited to specifically limit the characteristics of CIOT.
  • CIOT characteristics can be EPS optimization and EPS optimization.
  • CIOT characteristics can be other characteristics.
  • the preferred CIOT characteristics of the UE in the EPS are one or more CIOT characteristics of the CIOT characteristics supported by the UE in the EPS.
  • the preferred CIOT characteristic of the UE in 5GS is one or more of the CIOT characteristics supported by the UE in 5GS.
  • the preferred CIOT feature refers to the feature that the UE preferentially uses when the UE supports one or more CIOT features. For example, if the UE supports UP and CP optimization, the preferred feature is CP optimization.
  • the AMF determines to redirect the UE to the EPS according to the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the EPS may be obtained through step S602, or may be obtained through other methods, such as 5GS during the handover process, which is not limited in this embodiment of the present application.
  • the AMF may determine to redirect the UE to the EPS according to an operator policy and a load balancing situation. For example, when 5GS detects that the AMF load is too high and the UE supports the CIOT feature in the EPS, the AMF can actively redirect the UE to the EPS.
  • the AMF can also refer to the radio access technology (RAT) information reported by the network element of the 5GS access network and the load of the target core network (CN) in the area where the UE is located.
  • RAT radio access technology
  • CN target core network
  • the AMF sends redirection indication information to the S-RAN.
  • the redirection indication information is used to instruct the S-RAN to redirect the UE from the 5GS to the EPS.
  • the redirection indication information may be sent through an N2 message, such as an N2 notify message, an Initial UE Context Setup message, a UE Context Modification message, and a UE context release ( UE Context Release message, or Downlink Transport message.
  • N2 notify message such as an N2 notify message, an Initial UE Context Setup message, a UE Context Modification message, and a UE context release ( UE Context Release message, or Downlink Transport message.
  • the S-RAN sends a handover request message to the AMF.
  • the handover demand message may include first indication information, and the first indication information is used to indicate that the reason for sending the handover demand message is a 5GS redirection request.
  • the S-RAN may know that the AMF needs to redirect the UE to the EPS. Then, the S-RAN triggers a 5GS to EPS handover process by sending a handover required message to the AMF.
  • the first indication information is specifically a Redirect to EPC indication (Redirect to EPC indication) or a Redirection indication between different CIOT RATs.
  • the AMF After receiving the handover request message, the AMF selects the MME.
  • the AMF learns that the reason for sending the handover request message is the 5GS redirection request, and then selects the MME according to the CIOT feature supported by the UE and the preferred CIOT feature in the EPS.
  • the AMF sends a first message to the MME.
  • the first message is used to request the UE to be switched to EPS or EPC.
  • related network elements of 5GS and related network elements of EPS for example, AMF, S-RAN, MME, and T-RAN can perform subsequent handover procedures, so that the UE can switch the EPS.
  • the first message may be a relocation request message or a relocation complete message, but the embodiment of the present application is not limited thereto.
  • the AMF sends the redirection indication information to the S-RAN.
  • the S-RAN may trigger a handover process by sending a handover request message to the AMF.
  • the AMF starts the handover by sending a first message to the MME, thereby being able to switch the UE from 5GS to EPS. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from 5GS to EPS.
  • the first message may include second indication information, and the second indication information is used to enable the MME to no longer redirect the UE to the 5GS according to the second indication information.
  • the second instruction information may be the same as or different from the first instruction information, which is not limited in the embodiment of the present application.
  • the second indication information is specifically a 5GC redirection indication (Redirect from 5GC Indication) or a redirection indication between different CIOT RATs.
  • the method may further include:
  • the MME no longer redirects the UE to the 5GS according to the second instruction information.
  • the MME may no longer redirect the UE to the 5GS within a period of time (for example, within a preset time period) or a period of time configured by the network according to the second instruction information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, EPS or EPC) and then redirected back to the source system (that is, 5GS or 5GC).
  • the method may further include:
  • S616 The UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS to the MME.
  • the MME can perform a related redirection operation according to the CIOT feature and the preferred CIOT feature supported by the UE in 5GS.
  • the UE may carry the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS through a TAU request message in the TAU process.
  • FIG. 7 shows a schematic flowchart of a redirection method 700 according to an embodiment of the present application.
  • the method 700 mainly includes S704 to S712 described below.
  • the method 700 may further include S702 and / or S714.
  • S702 The UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS to the MME.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS may be registered with the MME.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS may be carried by an attach request message in an attach process or a TAU request message in a TAU process.
  • the UE may also send the CIOT feature and the preferred CIOT feature supported by the UE in the EPS to the AMF, so that the UE may register the CIOT feature and the preferred CIOT feature supported by the UE in the EPS with the MME.
  • the CIOT feature and the preferred CIOT feature supported by the UE in the EPS may be carried through the above-mentioned attach request message or TAU request message.
  • the CIOT feature supported by the UE in the EPS is also referred to as the EPS CIOT capability of the UE.
  • the CIOT feature supported by the UE in 5GS is also referred to as the 5GS CIOT capability of the UE.
  • the CIOT characteristic may be, for example, CP optimization and UP optimization.
  • the CIOT characteristic supported by the UE may be one of CP optimization and UP optimization, or both.
  • the present application is not limited to specifically limit the characteristics of CIOT.
  • CIOT characteristics can be EPS optimization and EPS optimization.
  • CIOT characteristics can be other characteristics.
  • the preferred CIOT characteristics of the UE in the EPS are one or more CIOT characteristics of the CIOT characteristics supported by the UE in the EPS.
  • the preferred CIOT characteristic of the UE in 5GS is one or more of the CIOT characteristics supported by the UE in 5GS.
  • the preferred CIOT feature refers to the feature that the UE preferentially uses when the UE supports one or more CIOT features. For example, if the UE supports UP and CP optimization, the preferred feature is CP optimization.
  • the MME determines to redirect the UE to the 5GS according to the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS.
  • the CIOT characteristic and the preferred CIOT characteristic supported by the UE in 5GS may be obtained through step S702, or may be obtained through other methods, such as obtained from the EPS during the handover process, which is not limited in this embodiment of the present application.
  • the MME may determine to redirect the UE to the 5GS according to an operator policy and a load balancing situation. For example, when the EPC detects that the MME is overloaded and the UE supports the CIOT feature in 5GS, the MME can actively redirect the UE to 5GS.
  • the MME can also refer to the RAT information reported by the access network element of the EPS that the UE can access, the load information of the target CN in the area where the UE is located, whether the UE can access 5GS and / or EPS subscription information, etc. One or more of the information decides to redirect the UE to 5GS.
  • the MME sends redirection indication information to the S-RAN.
  • the redirection indication information is used to instruct the S-RAN to redirect the UE from the EPS to the 5GS.
  • the redirection indication information may be sent through an S1-AP message, for example, an S1-AP notification message, an Initial UE Context Setup message, a UE Context Modification message, A UE context release (UE Context Release) message, or a downlink transmission (Downlink Transport) message.
  • S1-AP notification message for example, an S1-AP notification message, an Initial UE Context Setup message, a UE Context Modification message, A UE context release (UE Context Release) message, or a downlink transmission (Downlink Transport) message.
  • the S-RAN sends a handover request message to the MME.
  • the handover request message may include first indication information, and the first indication information is used to indicate that the reason for sending the handover request message is a redirection request of the EPS.
  • the S-RAN may know that the MME needs to redirect the UE to 5GS. Then, the S-RAN triggers an EPS to 5GS handover process by sending a handover required message to the MME.
  • the handover demand message may include first indication information, where the first indication information is used to indicate that the reason for sending the handover demand message is a redirection request of the EPS.
  • the first indication information is specifically a redirection to a 5GS indication (Redirect to 5GS indication) or a redirection indication between different CIOT RATs.
  • S710 The MME selects AMF according to the handover request message.
  • the MME After the MME learns that the reason for sending the handover request message is the EPS redirection request, it selects the AMF according to the CIOT feature and the preferred CIOT feature supported by the UE in 5GS.
  • the MME sends a first message to the AMF.
  • the first message is used to request the UE to be switched to 5GS or 5GC.
  • related network elements of 5GS and related network elements of EPS for example, AMF, S-RAN, MME, and T-RAN can perform subsequent handover procedures, so that the UE can be handed over to the 5GS.
  • the first message may be a relocation request message or a relocation complete message, but the embodiment of the present application is not limited thereto.
  • the MME sends redirection indication information to the S-RAN.
  • the S-RAN may trigger a handover process by sending a handover request message to the MME.
  • the MME starts the handover by sending a first message to the AMF, thereby being able to switch the UE from the EPS to 5GS. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from the EPS to the 5GS.
  • the first message may include second indication information, and the second indication information is used to cause the AMF to no longer redirect the UE to the EPS according to the second indication information.
  • the second instruction information may be the same as or different from the first instruction information, which is not limited in the embodiment of the present application.
  • the second indication information is specifically an EPC redirection indication (Redirect from EPC Indication) or a redirection indication between different CIOT RATs.
  • the method may further include:
  • the AMF no longer redirects the UE to the EPS according to the second instruction information.
  • the AMF may no longer redirect the UE to the EPS for a period of time (for example, within a preset time period) or a period of time configured by the network according to the second indication information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, 5GS) and then redirected back to the source system (that is, EPS or EPC).
  • the method may further include:
  • the UE sends a CIOT feature and a preferred CIOT feature supported by the UE in the EPS to the AMF.
  • the AMF can perform a related redirection operation according to the CIOT feature supported by the UE and the preferred CIOT feature.
  • the UE may carry the CIOT feature and the preferred CIOT feature supported by the UE in the EPS through a registration request message in the registration process.
  • FIG. 8 and 9 illustrate another redirection method provided according to the present application.
  • the method shown in FIG. 8 may be applied to a scenario where the UE is redirected from 5GS to EPS
  • the method shown in FIG. 9 may be applied to a scenario where the UE is redirected from EPS to 5GS. It should be understood that the methods shown in FIG. 8 and FIG. 9 may be applied to the system architecture 200 described above.
  • FIG. 8 shows a schematic flowchart of a redirection method 800 according to an embodiment of the present application.
  • the method 800 mainly includes S804 to S812 described below.
  • the method 800 may further include S802 and / or S814.
  • the UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the EPS to the AMF.
  • the AMF determines to redirect the UE to the EPS according to the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • the AMF sends redirection indication information to the S-RAN.
  • the redirection indication information is used to instruct the S-RAN to redirect the UE from the 5GS to the EPS.
  • the S-RAN sends the foregoing redirection indication information to the UE.
  • the S-RAN may carry the redirection indication information, such as an AN Connection Release message, through a message sent to the UE in an access network (AN) release process.
  • the AN release process is an AN release (AN release through inter-system redirection to EPS) process that is redirected to the EPS through the system.
  • AN release process refers to the reference technology, which is not described in this application.
  • the S-RAN may carry the redirection indication information, such as a handover command (Handover Command) message, by a message sent to the UE during a handover procedure.
  • a handover command Handover Command
  • the switching process is a switching process from 5GS to EPS.
  • 5GS to EPS For the process of switching from 5GS to EPS, please refer to the reference technology, which is not repeated in this application.
  • the S-RAN after receiving the redirection instruction information, the S-RAN does not send the handover requirement information to the AMF to trigger the handover process, but sends the redirection instruction information to the UE to trigger The UE performs subsequent processes.
  • the UE selects EPS or EPC.
  • the UE selects an EPC NAS and an EUTRAN cell, where the EPC to which the EUTRAN cell is connected supports the UE's CIOT capability and preferred CIOT characteristics.
  • the UE sends a second message to the EPS or EPC, and the second message is used to request access to the EPS.
  • the UE may request access to the EPS by sending a second message to the MME in the selected EPS or EPC. Then, the MME can perform a subsequent corresponding access process according to the second message, so that the UE can access the EPS.
  • the second message may be a TAU request (TAU request) message in a TAU process or an attach request (attach request) message in an attach process.
  • TAU request TAU request
  • attach request attach request
  • the EPS or EPC may perform a subsequent TAU procedure or an attach procedure according to the second message to access the UE to the EPS.
  • the AMF determines that the UE needs to be redirected to the EPS, it sends redirection indication information to the S-RAN, and then the S-RAN sends the redirection indication information to the UE.
  • the UE After receiving the redirection instruction information, the UE can send the second message to the MME to perform the access procedure to the EPS, so that the UE can access the EPS. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from 5GS to EPS.
  • the second message may include third indication information, and the third indication information is used to indicate that the reason for sending the second message is a 5GS redirection request, so that the MME no longer redirects according to the third indication information.
  • the third indication information may be the same as the first indication information or the second indication information described in the method 600, or may be different, which is not limited in the embodiment of the present application.
  • the third indication information is specifically a 5GC redirection indication (Redirect from 5GC Indication) or a redirection indication between different CIOT RATs.
  • the method may further include:
  • the MME no longer redirects the UE to 5GS or 5GC according to the third instruction information.
  • the MME may no longer redirect the UE back to 5GS or 5GC within a period of time (for example, within a preset period of time) or a period of time configured by the network according to the third instruction information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, EPS) and then redirected back to the source system (that is, 5GS or 5GC).
  • the UE may not carry the CIOT feature and the preferred CIOT feature supported by the UE in 5GS in the second message, or disable the CIOT capability of 5GS.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, EPS) and then redirected back to the source system (that is, 5GS or 5GC).
  • the second message may further include a CIOT characteristic and a preferred CIOT characteristic supported by the UE in the 5GS.
  • the MME can perform a related redirection operation according to the CIOT feature and the preferred CIOT feature supported by the UE in 5GS.
  • FIG. 9 shows a schematic flowchart of a redirection method 900 according to an embodiment of the present application.
  • the method 900 mainly includes S904 to S912 described below.
  • the method 900 may further include S902 and / or S914.
  • the UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS to the MME.
  • the MME determines to redirect the UE to the 5GS according to the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS.
  • the MME sends redirection indication information to the S-RAN.
  • the redirection indication information is used to instruct the S-RAN to redirect the UE from the EPS to the 5GS.
  • the S-RAN sends the redirection indication information to the UE.
  • the S-RAN may carry the redirection indication information, such as an RRC Connection Release message, through a message sent to the UE in the S1 release process.
  • the redirection indication information such as an RRC Connection Release message
  • the S1 release process please refer to the reference technology, which will not be repeated here in this application.
  • the S-RAN may carry the redirection indication information, such as a handover command (Handover Comman) message, by a message sent to the UE during a handover procedure.
  • a handover command Handover Comman
  • the switching process is a switching process from EPS to 5GS.
  • EPS to 5GS For the process of switching from EPS to 5GS, please refer to the reference technology, which will not be repeated here.
  • the S-RAN after receiving the redirection indication information, the S-RAN does not send the handover requirement information to the MME to trigger the handover process, but sends the redirection indication information to the UE, thereby Trigger the UE to perform the access process.
  • the UE selects 5GS or 5GC.
  • the UE selects 5GC NAS and NR cell, where the 5GC to which the NR cell is connected supports the UE's CIOT capability and preferred CIOT characteristics.
  • the UE sends a second message to the 5GS or 5GC, and the second message is used to request access to the 5GS.
  • the UE may request access to 5GS by sending a second message to the selected 5GS or 5GC. Then, the AMF can perform subsequent corresponding access procedures according to the second message, so that the UE can access 5GS.
  • the second message may be a registration request message in a registration process. It should be understood that, correspondingly, the 5GS or 5GC performs a subsequent registration process according to the second message to access the UE to the 5GS.
  • the MME determines that the UE needs to be triggered to redirect to 5GS, it sends redirection indication information to the S-RAN, and then the S-RAN sends the redirection indication information to the UE.
  • the UE After receiving the redirection instruction information, the UE can send a second message to the AMF to perform the 5GS access process, so that the UE can access the 5GS. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from the EPS to the 5GS.
  • the second message may include third indication information
  • the third indication information is used to indicate that the reason for sending the second message is a redirection request of the EPS, so that the AMF no longer redirects according to the third indication information
  • the UE to the EPC may be the same as or different from the first indication information or the second indication information described in the method 700, which is not limited in this embodiment of the present application.
  • the third indication information is specifically an EPC redirection indication (Redirect from EPC Indication) or a redirection indication between different CIOT RATs.
  • the method may further include:
  • the AMF no longer redirects the UE to the EPS or EPC according to the third instruction information.
  • the AMF may no longer redirect the UE back to the EPS or EPC for a period of time (for example, within a preset time period) or a period of time configured by the network according to the third indication information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, 5GS) and then redirected back to the source system (that is, EPS or EPC).
  • the UE may not carry the CIOT feature and the preferred CIOT feature supported by the UE in the EPS in the second message, or disable the CIOT capability of the EPS.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (that is, EPS) and then redirected back to the source system (that is, EPS or EPC).
  • the second message may further include a CIOT characteristic and a preferred CIOT characteristic supported by the UE in the EPS.
  • the AMF can perform a related redirection operation according to the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • FIG. 10 and FIG. 11 show still another redirection method provided according to the present application.
  • the method shown in FIG. 10 may be applied to a scenario where the UE is redirected from 5GS to EPS, and the method shown in FIG. 11 may be applied to a scenario where the UE is redirected from EPS to 5GS. It should be understood that the methods shown in FIG. 10 and FIG. 11 may be applied to the system architecture 200 described above.
  • FIG. 10 shows a schematic flowchart of a redirection method 1000 according to an embodiment of the present application.
  • the method 1000 mainly includes S1004 to S1012 described below.
  • the method 1000 may further include S1002 and / or S1014.
  • S1002 The UE sends a CIOT feature and a preferred CIOT feature supported by the UE in the EPS to the AMF.
  • the AMF determines to redirect the UE to the EPS according to the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • the AMF sends redirection indication information to the UE.
  • the redirection indication information is used to instruct the UE to redirect to the EPS.
  • the redirection indication information may be carried in a process such as deregistration, registration, or UE configuration, and the NAS message sent by the AMF to the UE, such as a registration response message, a deregistration request message, or a UE configuration update command. Message.
  • the AMF first sends the redirection indication information to the S-RAN through the N2 message, and then the S-RAN sends the redirection indication information to the UE through the AN release process.
  • the redirection indication information is sent through a NAS message.
  • the UE selects EPS or EPC.
  • the UE selects an EPC NAS and an EUTRAN cell, where the EPC to which the EUTRAN cell is connected supports the UE's CIOT capability and preferred CIOT characteristics. S1010.
  • the UE sends a second message to the EPS or EPC, and the second message is used to request access to the EPS or EPC.
  • the AMF determines that it is necessary to trigger the UE to redirect to the EPS, it sends redirection instruction information to the UE.
  • the UE selects EPS and performs An access process, so that the UE can be connected to the EPS. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from 5GS to EPS.
  • the second message may include third indication information.
  • third indication information reference may be specifically made to the description made in the foregoing method 800, and details are not described herein again.
  • the method may further include: S1012, the MME no longer redirects the UE to the 5GS according to the third instruction information.
  • the MME may no longer redirect the UE back to 5GS or 5GC within a period of time (for example, within a preset period of time) or a period of time configured by the network according to the third instruction information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (EPS or EPC) and then redirected back to the source system (5GS or 5GC).
  • EPS target system
  • EPC target system
  • 5GS or 5GC source system
  • the second message may further include a CIOT characteristic and a preferred CIOT characteristic supported by the UE in the 5GS.
  • the MME can perform a related redirection operation according to the CIOT feature and the preferred CIOT feature supported by the UE in 5GS.
  • the UE may disable a CIOT feature supported by the UE in 5GS. Therefore, the UE does not redirect back to 5GS.
  • the second message described above does not include a CIOT feature and a preferred CIOT feature supported by the UE in 5GS.
  • the MME does not redirect the UE back to 5GS or 5GC.
  • FIG. 11 shows a schematic flowchart of a redirection method 1100 according to an embodiment of the present application.
  • the method 1100 mainly includes S1104 to S1112 described below.
  • the method 1100 may further include S1102 and / or S1114.
  • the UE sends the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS to the MME.
  • the MME determines to redirect the UE to the 5GS according to the CIOT feature and the preferred CIOT feature supported by the UE in the 5GS.
  • the MME sends redirection indication information to the UE.
  • the redirection indication information is used to instruct the UE to redirect to 5GS.
  • the redirection indication information may be carried in a detach, attach, or TAU process, and the MME sends a NAS message to the UE, such as an attach response message, a detach request message, or a TAU response. Message.
  • the MME first sends redirection indication information to the S-RAN through the S1-AP message, and then the S-RAN sends the redirection indication information to the UE through the S1 release process.
  • the redirection indication information is sent through a NAS message.
  • the UE selects 5GS or 5GC.
  • the UE selects 5GC NAS and NR cell, where the 5GC to which the NR cell is connected supports the UE's CIOT capability and preferred CIOT characteristics.
  • the UE sends a second message to the 5GS or 5GC, and the second message is used to request access to the 5GS.
  • the MME determines that it is necessary to trigger the UE to redirect to 5GS, it sends redirection instruction information to the UE.
  • the UE selects 5GS and proceeds to The access process, so that the UE can access the 5GS or 5GC. Therefore, the redirection method in the embodiment of the present application can solve the redirection problem of the UE from the EPS to the 5GS.
  • the second message may include third indication information.
  • the third indication information may specifically refer to the description made in the foregoing method 900, and details are not described herein again.
  • the method may further include: S1112, the AMF no longer redirects the UE to the EPS according to the third instruction information.
  • the AMF may no longer redirect the UE to the EPS or EPC for a period of time (for example, within a preset time period) or a period of time configured by the network according to the third indication information.
  • the redirection method in the embodiment of the present application can prevent the UE from being redirected to the target system (5GS or 5GC) and then redirected back to the source system (EPS or EPC).
  • the second message may further include a CIOT characteristic and a preferred CIOT characteristic supported by the UE in the EPS. Therefore, when the UE needs to be redirected to the EPS, the AMF can perform a related redirection operation according to the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • the UE may disable a CIOT feature supported by the UE in the EPS.
  • the UE does not redirect back to the EPS.
  • the second message described above does not include the CIOT feature and the preferred CIOT feature supported by the UE in the EPS.
  • the AMF does not redirect the UE back to the EPS.
  • FIG. 12 shows a communication device 1200 according to an embodiment of the present application.
  • the communication device 1200 may be the foregoing mobile management network element of the first system.
  • the communication device 1200 includes a processing unit 1210, a sending unit 1220, and a receiving unit 1230. .
  • a processing unit 1210 configured to determine to redirect the terminal to the second system according to a cellular IoT CIOT characteristic and a preferred CIOT characteristic supported by the terminal in the second system;
  • a sending unit 1220 is configured to send redirection instruction information to an access network element of the first system, where the redirection instruction information is used to instruct the access network element of the first system to remove the terminal from the terminal. Said first system is redirected to said second system;
  • the receiving unit is configured to receive a handover demand message from an access network element of the first system, where the handover demand message includes first indication information, and the first indication information is used to instruct sending the handover demand message.
  • the reason is the redirection request of the first system;
  • the processing unit 1210 is further configured to select a mobility management network element of the second system according to the handover requirement message;
  • the sending unit 1220 is further configured to send a first message to a mobile management network element of the second system, where the first message is used to request the terminal to be switched to the second system.
  • the first message includes second indication information
  • the second indication information is used to enable the mobile management network element of the second system to no longer redirect the terminal according to the second indication information To the first system.
  • the communication device 1200 here is embodied in the form of a functional unit.
  • the term "unit” herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and / or other suitable components that support the functions described.
  • ASIC application-specific integrated circuit
  • processor such as a shared processor, a proprietary processor, or a group of processors
  • memory merge logic, and / or other suitable components that support the functions described.
  • the communication device 1200 may be specifically the AMF or MME in the above method embodiment, and the communication device 1200 may be used to execute the processes corresponding to the AMF or MME in the above method embodiment And / or steps, in order to avoid repetition, details are not repeated here.
  • FIG. 13 illustrates a communication device 1300 provided in an embodiment of the present application.
  • the communication device 1300 may be the foregoing UE or terminal, or may be a chip.
  • the communication device 1300 includes a receiving unit 1310, a processing unit 1320, and a transmitting unit 1330.
  • the receiving unit 1210 is configured to receive redirection instruction information, where the redirection instruction information is used to instruct the communication device to redirect to the second system, and the redirection of the communication device to the second system is based on the second
  • the cellular IoT CIOT characteristics and preferred CIOT characteristics supported by the communication device in the system are determined;
  • a processing unit 1320 configured to select the second system according to the redirection instruction information
  • the sending unit 1330 is configured to send a second message to the second system, where the second message is used to request access to the second system.
  • the receiving unit 1310 is specifically configured to:
  • the second message includes third indication information, and the third indication information is used to indicate that the reason for sending the second message is a redirection request of the first system, so that the second system moves The management network element no longer redirects the communication device to the first system according to the third instruction information.
  • the communication device disables a CIOT feature supported by the communication device in the first system.
  • the second message does not include a CIOT characteristic and a preferred CIOT characteristic supported by the communication device in the first system, so that the second system no longer redirects the communication according to the second message.
  • Device to the first system is not limited to a CIOT characteristic and a preferred CIOT characteristic supported by the communication device in the first system, so that the second system no longer redirects the communication according to the second message.
  • the communication device 1300 here is embodied in the form of a functional unit.
  • the term "unit” herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) for executing one or more software or firmware programs. Processors, etc.) and memory, merge logic, and / or other suitable components that support the functions described.
  • ASIC application-specific integrated circuit
  • processor such as a shared processor, a proprietary processor, or a group of processors
  • memory merge logic, and / or other suitable components that support the functions described.
  • the communication device 1300 may specifically be a UE in the foregoing method embodiment, and the communication device 1300 may be configured to execute various processes and / or steps corresponding to the UE in the foregoing method embodiment. To avoid repetition, we will not repeat them here.
  • the communication device 1200 and the communication device 1300 of each of the above solutions have the functions of implementing the corresponding steps performed by the AMF / MME and the UE in the above method; the functions may be implemented by hardware, or may be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions; for example, the transmitting unit may be replaced by a transmitter, the receiving unit may be replaced by a receiver, and other units, such as a determination unit, may be replaced by a processor and executed separately. Sending and receiving operations and related processing operations in various method embodiments.
  • the communication device in FIG. 12 and FIG. 13 may also be a chip or a chip system, for example, a system on chip (SoC).
  • the receiving unit and the transmitting unit may be the transceiver circuit of the chip, which is not limited herein.
  • the communication device in FIG. 12 or the communication device in FIG. 13 in the embodiment of the present application may be implemented by the device 1400 in FIG. 14 and may be used to perform each step corresponding to the MME / AMF and the UE in the foregoing method embodiment And / or process.
  • FIG. 14 shows a device 1400 provided by an embodiment of the present application.
  • the device 1400 includes a processor 1410, a transceiver 1420, and a memory 1430.
  • the processor 1410, the transceiver 1420, and the memory 1430 communicate with each other through an internal connection path.
  • the memory 1430 is used to store instructions, and the processor 1410 is used to execute the instructions stored in the memory 1430 to control the transceiver 1420 to send signals and / Or receive a signal.
  • the processor 1410 is configured to: according to the CIOT characteristics and preferred CIOT characteristics, determine to redirect the terminal to the second system; send redirection indication information to the access network element of the first system through the transceiver 1420, and the redirection indication information is used to indicate the The network element of the access network of the first system redirects the terminal from the first system to the second system; and receives a handover request message from the network element of the access network through the transceiver 1420,
  • the handover demand message includes first indication information, and the first indication information is used to indicate that the reason for sending the handover demand message is a redirection request of the first system; and according to the handover demand message, selecting the first A mobile management network element of the second system; sending a first message to the mobile management network element of the second system through the transceiver 1420, the first message being used to request the terminal to be switched to the second system
  • the processor 1410 is configured to receive redirection instruction information through a transceiver 1420, where the redirection instruction information is used to instruct the communication device to redirect to a second system, and the communication device redirects To the second system is determined according to the cellular IoT CIOT characteristic and the preferred CIOT characteristic supported by the communication device in the second system; selecting the second system according to the redirection instruction information; through a transceiver 1420 sends a second message to the second system, where the second message is used to request access to the second system.
  • the memory 1430 may include a read-only memory and a random access memory, and provide instructions and data to the processor.
  • a portion of the memory may also include non-volatile random access memory.
  • the memory may also store information about the type of device.
  • the processor 1410 may be configured to execute instructions stored in the memory, and when the processor 1410 executes instructions stored in the memory, the processor 1410 is configured to execute the foregoing method corresponding to the terminal or the mobile management network element of the first system Various steps and / or processes of the embodiment.
  • the above-mentioned transceiver may include a transmitter and a receiver.
  • the transceiver may further include antennas, and the number of antennas may be one or more.
  • the memory can be a separate device or it can be integrated into the processor.
  • Each of the above devices or part of the devices may be integrated into a chip and implemented, for example, integrated into a baseband chip.
  • the transceiver in FIG. 14 may also be a communication interface, which is not limited herein.
  • names of the first message, the second message, and other various messages are adopted.
  • these messages are merely examples of the content or functions to be carried, and the specific names of the messages do not limit the application, for example, request messages, response messages, and so on.
  • These messages can be specific messages or certain fields in the message.
  • These messages can also represent various service-oriented operations.
  • the processor of the foregoing device may be a central processing unit (CPU), and the processor may also be another general-purpose processor or a digital signal processor (DSP). ), Application specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed and completed by a combination of hardware and software units in the processor.
  • the software unit may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory, and the processor executes the instructions in the memory and completes the steps of the foregoing method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center.
  • the computer A readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes one or more available medium integrations.
  • the available medium may be a magnetic medium (eg, a floppy disk, a hard disk, Magnetic tape), optical media (for example, DVD), or semiconductor media (for example, solid state disk (SSD)).
  • the disclosed systems, devices, and methods may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, which may be electrical, mechanical 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, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units may be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially a part that contributes to the existing technology or a part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
  • the aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

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Abstract

本申请提供了一种重定向的方法、通信系统和通信装置，能够实现终端在异系统间的重定向，进一步地，能够实现5GS和EPS之间的重定向。该方法包括：第一系统的移动管理网元根据第二系统中终端支持的CIOT特性和优选的CIOT特性，确定将该终端重定向至第二系统。然后，第一系统的移动管理网元向第一系统的接入网网元发送重定向指示信息，重定向指示信息用于指示第一系统的接入网网元将终端从第一系统重定向至第二系统。接着，第一系统的移动管理网元接收来自第一系统的接入网网元的切换需求消息，并根据切换需求消息，选择第二系统的移动管理网元，以及，向第二系统的移动管理网元发送第一消息，第一消息用于请求将终端切换至第二系统。

Description

重定向的方法、通信系统和通信装置
本申请要求于2018年6月26日提交中国国家知识产权局、申请号为201810670609.8、发明名称为“重定向的方法、通信系统和通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及一种重定向的方法、通信系统和通信装置。
背景技术
蜂窝物联网(cellular internet of things，CIOT)是一种通过窄带物联网(narrowband internet of things，NB-IoT)接入技术或增强机器通信(enhanced machine type communication,eMTC)的接入技术实现CIOT终端接入到移动通信网络的物联网。典型的CIOT系统为演进分组系统(Evolved Packet System，EPS)。为适应更高速的业务需求，第三代合作伙伴项目(3rd generation partnership project，3GPP)定义了第五代移动通信系统(5th generation system，5GS)。支持CIOT 5GS特性和CIOT EPS特性的CIOT终端可以接入EPS，也可以接入5GS。但是，在CIOT终端接入(5th generation system core，5GC)时，根据运营商策略或负载均衡需求，5GC可以重定向CIOT终端到演进分组核心网(evolved packet core，EPC)。或者CIOT终端接入EPC时，根据运营商策略或负载均衡需求，EPC可以重定向CIOT终端到5GC。然而，具体如何进行重定向，目前还没有解决方案。
发明内容
本申请提供一种重定向的方法、通信系统和通信装置，能够实现终端在异系统间的重定向，进一步地，能够实现5GS和EPS之间的重定向。
第一方面，本申请提供了一种重定向的方法，该方法包括：第一系统的移动管理网元根据第二系统中终端支持的CIOT特性和优选的CIOT特性，确定将该终端重定向至所述第二系统。然后，第一系统的移动管理网元向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统。接着，所述第一系统的移动管理网元接收来自所述第一系统的接入网网元的切换需求消息，其中，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求。然后，所述第一系统的移动管理网元根据所述切换需求消息，选择所述第二系统的移动管理网元，以及，向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
可选地，第一系统可以是5GS(或者5GC)，第二系统可以为EPS(或者5GC)。或者，第一系统可以是EPS(或者EPC)，第二系统可以为5GS(或者EPC)。下文中涉及到的举例均以5GS和EPS为例，但本申请并不限定于此。
可选地，所述第一指示信息具体为重定向至EPC指示(Redirect to EPC Indication)；或者，所述第一指示信息具体为重定向至5GC指示(Redirect to 5GC Indication)；或者，所述第一指示信息具体为不同CIOT无线接入技术(radio access technology，RAT)之间重定向指示 (CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection)；或者，所述第一指示信息具体为不同CIOT系统之间重定向指示(CIOT Inter-System Rediretion或Inter CIOT System Redirection)。
本申请实施例的重定向的方法，第一系统的移动管理网元在确定需要触发终端重定向到第二系统时，向第一系统的接入网网元发送重定向指示信息。第一系统的接入网网元接收到重定向指示信息后，向第一系统的移动管理网元发送切换需求消息。第一系统的移动管理网元接收到切换需求消息后，通过向第二系统的移动管理网元发送第一消息，开始进行切换，从而能够将终端从第一系统切换至第二系统。因此，本申请实施例的重定向的方法，能够解决两个不同系统之间的重定向问题。并且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
应理解，本申请涉及的终端可以是CIOT终端。
结合第一方面，在一种可能的实现方式中，所述第二系统中终端支持的CIOT特性和优选的CIOT特性可以是终端向第一系统的移动管理网元发送的。
可选地，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求(registration request)消息、附着请求(attach request)消息或者跟踪区更新(tracking area update，TAU)请求(request)消息携带，但本申请并不仅限于此。例如，在第一系统为5GS，第二系统为EPS的情况下，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求消息携带。在第一系统为EPS，第二系统为5GS的情况下，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过附着请求消息或者TAU请求消息携带。
应理解，终端还可以向第一系统的移动管理网元发送第一系统中该终端支持的CIOT特性和优选的CIOT特性，这样该终端可以将第一系统中该终端支持的CIOT特性和优选的CIOT特性注册到第一系统的移动管理网元。示例性的，第一系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求消息、附着请求消息或者TAU请求消息携带。
需要说明的是，第二系统中该终端优选的CIOT特性为第二系统中该终端支持的CIOT特性中的一个或者多个CIOT特性。类似地，第一系统中该终端优选的CIOT特性为第一系统中该终端支持的CIOT特性中的一个或者多个CIOT特性。
在本申请中，CIOT特性例如可以是控制面(control plane，CP)优化和用户面(user plane，UP)优化，该终端支持的CIOT特性可能是CP优化和UP优化二者中的其中一种，也可能二者都支持。但应理解，本申请并不限定对CIOT特性作具体限定。比如，在EPS中，CIOT特性可以是EPS CP优化和EPS UP优化，在5GS中，CIOT特性可以是其他的特性。
结合第一方面，在一种可能的实现方式中，所述重定向指示信息可以通过一条N2消息发送，比如N2通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。或者，该重定向指示信息可以通过S1应用层(S1application plane，S1-AP)消息发送，比如，S1-AP通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。例如，在第一系统为5GS，第二系统为EPS的情况下，该重定向指示信息可以通过N2消息发送。在第一系统为EPS，第二系统为5GS的情况下，该重定向指示信息可以通过S1-AP消息发送。 其中，N2为5GS的移动管理网元和5GS的接入网网元之间的接口，S1-AP为EPS的移动管理网元和EPS的接入网网元之间的接口。
结合第一方面，在一种可能的实现方式中，该第一消息可以是重定位请求(relocation request)消息或者重定位完成(relocation complete)消息，但本申请实施例并不仅限于此。
结合第一方面，在一种可能的实现方式中，所述第一消息包括第二指示信息，所述第二指示信息用于使所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
因此，本申请实施例的重定向的方法，能够防止终端从目标系统(即，第二系统)重定向回源系统(即，第一系统)。
进一步地，所述第二指示信息具体为来自5GC重定向指示(Redirect from 5GC Indication)；或者来自EPC重定向指示(Redirect from EPC Indication)；或者，所述第二指示信息具体为不同CIOT RAT之间重定向指示(CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection)；或者，所述第二指示信息具体为不同CIOT系统之间重定向指示(CIOT Inter-System Rediretion或Inter CIOT System Redirection)。比如，在第一系统为5GS，第二系统为EPS的情况下，第二指示信息具体为来自5GC重定向指示(Redirect from 5GC Indication)。在第一系统为EPS，第二系统为5GS的情况下，第二指示信息具体为来自EPC重定向指示(Redirect from EPC Indication)。
第二方面，本申请提供了一种重定向的方法，该方法包括：第一系统的接入网网元接收第一系统的移动管理网元发送的重定向指示信息；第一系统的接入网网元在接收到该重定向指示信息后，向第一系统的移动管理网元发送切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求。
可选地，所述第一指示信息具体为重定向至EPC指示(Redirect to EPC Indication)；或者，所述第一指示信息具体为重定向至5GC指示(Redirect to 5GC Indication)；或者，所述第一指示信息具体为不同CIOT RAT之间重定向指示(CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection)；或者，所述第一指示信息具体为不同CIOT系统之间重定向指示(CIOT Inter-System Rediretion或Inter CIOT System Redirection)。
所述重定向指示信息可以通过一条N2消息发送，比如N2通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。或者，该重定向指示信息可以通过S1应用层(S1application plane，S1-AP)消息发送，比如，S1-AP通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。例如，在第一系统为5GS，第二系统为EPS的情况下，该重定向指示信息可以通过N2消息发送。在第一系统为EPS，第二系统为5GS的情况下，该重定向指示信息可以通过S1-AP消息发送。其中，N2为5GS的移动管理网元和5GS的接入网网元之间的接口，S1-AP为EPS的移动管理网元和EPS的接入网网元之间的接口。
本申请实施例的重定向的方法，第一系统的移动管理网元在确定需要触发终端重定向到第二系统时，向第一系统的接入网网元发送重定向指示信息。第一系统的接入网网元接收到 重定向指示信息向，向第一系统的移动管理网元发送切换需求消息，以触发切换流程，将终端从第一系统切换至第二系统。因此，本申请实施例的重定向的方法，能够解决两个不同系统之间的重定向问题。并且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
第三方面，提供了一种重定向的方法，该方法包括：终端接收重定向指示信息，所述重定向指示信息用于指示所述终端重定向至第二系统，所述终端重定向至所述第二系统是根据所述第二系统中所述终端支持的蜂窝物联网CIOT特性和优选的CIOT特性确定的。接着，所述终端根据所述重定向指示信息选择所述第二系统。然后，所述终端向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
本申请实施例的重定向的方法，终端在接收到重定向指示信息后，通过向第二系统的移动管理网元发送第二消息，可以进行到第二系统的接入流程，从而能够将该终端接入第二系统。因此，本申请实施例的重定向的方法，能够解决两个不同系统之间的重定向问题。并且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
结合第三方面，在一种可能的实现方式中，所述第二系统中终端支持的CIOT特性和优选的CIOT特性可以是终端向第一系统的移动管理网元发送的。
可选地，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求(registration request)消息、附着请求(attach request)消息或者跟踪区更新(tracking area update，TAU)请求(request)消息携带，但本申请并不仅限于此。例如，在第一系统为5GS，第二系统为EPS的情况下，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求消息携带。在第一系统为EPS，第二系统为5GS的情况下，第二系统中该终端支持的CIOT特性和优选的CIOT特性可以通过附着请求消息或者TAU请求消息携带。
应理解，终端还可以向第一系统的移动管理网元发送第一系统中该终端支持的CIOT特性和优选的CIOT特性，这样该终端可以将第一系统中该终端支持的CIOT特性和优选的CIOT特性注册到第一系统的移动管理网元。示例性的，第一系统中该终端支持的CIOT特性和优选的CIOT特性可以通过注册请求消息、附着请求消息或者TAU请求消息携带。
需要说明的是，第二系统中该终端优选的CIOT特性为第二系统中该终端支持的CIOT特性中的一个或者多个CIOT特性。类似地，第一系统中该终端优选的CIOT特性为第一系统中该终端支持的CIOT特性中的一个或者多个CIOT特性。
在本申请中，CIOT特性例如可以是控制面(control plane，CP)优化和用户面(user plane，UP)优化，该终端支持的CIOT特性可能是CP优化和UP优化二者中的其中一种，也可能二者都支持。但应理解，本申请并不限定对CIOT特性作具体限定。比如，在EPS中，CIOT特性可以是EPS CP优化和EPS UP优化，在5GS中，CIOT特性可以是其他的特性。
结合第三方面，在一种可能的实现方式中，所述终端接收重定向指示信息，具体包括：所述终端接收来自第一系统的移动管理网元的所述重定向指示信息。
具体地，第一系统的移动管理网元可以直接向终端发送该重定向指示信息，比如，第一系统的移动管理网元可以通过非接入层(non-access-stratum，NAS)消息向终端发送该重定向指示信息。示例性的，该重定向指示信息可以通过去注册、注册、UE配置(configuration)、 去附着(detach)、附着(attach)或者TAU等流程中，第一系统的移动管理网元向该UE发送的NAS消息中携带。比如，在第一系统为5GS，第二系统为EPC的情况下，该重定向指示信息可以通过注册响应消息、去注册请求消息或者UE配置更新命令消息等消息携带。在第一系统为EPC，第二系统为5GS的情况下，该重定向指示信息可以通过附着响应消息、去附着请求消息或者TAU响应消息等消息携带。
结合第三方面，在一种可能的实现方式中，所述终端接收重定向指示信息，具体包括：所述终端接收来自第一系统的接入网网元的所述重定向指示信息。
具体地，第一系统的移动管理网元可以先向第一系统的接入网网元发送该重定向指示信息，然后，第一系统的接入网网元再向该终端发送该重定向指示信息。
示例性地，第一系统的移动管理网元可以通过N2消息或者S1-AP消息向第一系统的接入网网元发送该重定向指示信息，然后第一系统的接入网网元再通过AN释放(release)流程或者S1释放流程或者切换流程中向该终端发送的消息携带该重定向指示信息。
N2消息例如可以是N2通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。S1-AP消息例如可以是S1-AP通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。
AN释放流程中第一系统的接入网网元向终端发送的消息例如可以是AN连接释放(AN Connection Release)消息。比如，该AN释放流程为通过系统间重定向至EPS的AN释放(AN Release via inter-system redirection to EPS)流程。AN释放(release)流程具体可以参照参见技术，本申请在此不再赘述。
S1释放流程中第一系统的接入网网元向终端发送的消息例如可以是RRC连接释放(RRC Connection Release)消息。S1释放流程具体可以参照参见技术，本申请在此不再赘述。
切换流程中第一系统的接入网网元向终端发送的消息例如可以是切换命令(Handover Comman)消息。比如，该切换流程为EPS到5GS的切换流程。EPS到5GS的切换流程具体可以参照参见技术，本申请在此不再赘述。
结合第三方面，在一种可能的实现方式中，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述终端至所述第一系统。从而，能够避免终端重定向至第二系统后，再重定向回第一系统。
进一步地，所述第三指示信息具体为来自5GC重定向指示(Redirect from 5GC Indication)或者来自EPC重定向指示(Redirect from EPC Indication)；或者，所述第三指示信息具体为不同CIOT RAT之间重定向指示(CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection)；或者，所述第三指示信息具体为不同CIOT系统之间重定向指示(CIOT Inter-System Rediretion或Inter CIOT System Redirection)。
可选地，第二消息可以是注册请求(registration request)消息、附着请求(Attach request)消息、或者TAU请求(TAU request)消息。具体地，在第一系统为5GS，第二系统为EPS的情况下，第二消息可以是附着请求(Attach request)消息或者TAU请求(TAU request)消息。在第一系统为EPS，第二系统为5GS的情况下，第二消息可以是注册请求(registration  request)消息。
结合第三方面，在一种可能的实现方式中，所述终端禁用第一系统中所述终端支持的CIOT特性。从而，能够避免终端重定向至第二系统后，再重定向回第一系统。
结合第三方面，在一种可能的实现方式中，所述第二消息不包括第一系统中所述终端支持的CIOT特性和优选的CIOT特性，以使所述第二系统根据所述第二消息，不再重定向所述终端至所述第一系统。从而，能够避免终端重定向至第二系统后，再重定向回第一系统。
第四方面，提供了一种重定向的方法，该方法包括：第一系统的接入网网元接收第一系统的移动管理网元发送的重定向指示信息；第一系统的接入网网元向终端发送该重定向指示信息。
可选地，第一系统的移动管理网元可以通过N2消息或者S1-AP消息向第一系统的接入网网元发送该重定向指示信息，然后第一系统的接入网网元再通过AN释放(release)流程或者S1释放流程或者切换流程中向该终端发送的消息携带该重定向指示信息。
本申请实施例的重定向的方法，第一系统的接入网网元在接收到重定向指示信息后，可以向终端发送该重定向指示信息，从而触发终端进行接入流程，以接入第二系统。因此，本申请实施例的重定向的方法，能够解决两个不同系统之间的重定向问题。并且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
第五方面，提供了一种通信系统，包括第一系统的移动管理网元和所述第一系统的接入网网元。
其中，所述第一系统的移动管理网元用于：根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统，并且向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统。
所述第一系统的接入网网元用于：接收来自所述第一系统的移动管理网元的重定向指示信息，并且向所述第一系统的移动管理网元发送切换需求消息。
以及，所述第一系统的移动管理网元还用于：
接收来自所述第一系统的接入网网元的所述切换需求消息；
根据所述切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；
选择所述第二系统的移动管理网元；
向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
结合第五方面，在一种可能的实现方式中，所述第一消息包括第二指示信息，所述第二指示信息用于所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
第六方面，提供了一种通信系统，包括终端和第一系统的移动管理网元。
其中，所述第一系统的移动管理网元用于：根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；向所述终端发送重定向指示信息，所述重定向指示信息用于指示所述终端重定向至所述第二系统。
以及，所述终端用于：接收来自所述第一系统的移动管理网元的所述重定向指示信息； 向所述第二系统的移动管理网元发送第二消息，所述第二消息用于请求接入到所述第二系统。
结合第六方面，在一种可能的实现方式中，所述系统还包括所述第一系统的接入网网元；所述第一系统的移动管理网元用于：
接收来自所述第一系统的移动管理网元的所述重定向指示信息；
向所述终端发送所述重定向指示信息。
结合第六方面，在一种可能的实现方式中，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是所述第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述终端至所述第一系统。
结合第六方面，在一种可能的实现方式中，该终端还用于禁用第一系统中所述终端支持的CIOT特性。从而，能够避免终端重定向至第二系统后，再重定向回第一系统。
结合第六方面，在一种可能的实现方式中，所述第二消息不包括所述第一系统中所述终端支持和优选的CIOT特性，以使所述第二系统的移动管理网元根据所述第二消息，不再重定向所述终端至所述第一系统。
第七方面，提供了一种通信装置，用于执行上述第一方面或第一方面的任一可能的实现方式中的方法。具体地，该装置包括用于执行上述第一方面或第一方面的任一可能的实现方式中的方法的单元。
第八方面，提供了一种通信装置，用于执行上述第二方面或第二方面的任一可能的实现方式中的方法。具体地，该装置包括用于执行上述第二方面或第二方面的任一可能的实现方式中的方法的单元。
第九方面，提供了一种通信装置，用于执行上述第三方面或第三方面的任一可能的实现方式中的方法。具体地，该装置包括用于执行上述第三方面或第三方面的任一可能的实现方式中的方法的单元。
第十方面，提供了一种通信装置，用于执行上述第四方面或第四方面的任一可能的实现方式中的方法。具体地，该装置包括用于执行上述第四方面或第四方面的任一可能的实现方式中的方法的单元。
第十一方面，提供了另一种通信装置，该装置包括：收发器、存储器和处理器。其中，该收发器、该存储器和该处理器通过内部连接通路互相通信，该存储器用于存储指令，该处理器用于执行该存储器存储的指令，以控制接收器接收信号，并控制发送器发送信号，使得该装置执行第一方面至第四方面或第一方面至第四方面中的任一种可能的实现方式中的方法。
第十二方面，提供了另一种装置，该装置包括：处理器；所述处理器用于与存储器耦合，并读取存储器中的指令之后，根据所述指令执行如上述第一方面至第四方面或第一方面至第四方面中的任一种可能的实现方式中的方法。
第十三方面，提供了一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码被计算机运行时，使得该计算机执行上述任一方面的任意可能的实现方式中的方法。
第十四方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行上述任一方面的任意可能的实现方式中的方法的指令。
第十五方面，提供了一种通信芯片，其中存储有指令，当其在计算机设备上运行时，使得该通信芯片执行上述任一方面的任意可能的实现方式中的方法。
附图说明
图1是应用于本申请提供的一种系统架构的示意图。
图2是应用于本申请提供的另一种系统架构的示意图。
图3是EPS的架构示意图。
图4是简化的5GS的架构示意图。
图5是5GS的架构示意图。
图6是本申请提供的一种重定向的方法的示意性流程图。
图7是本申请提供的一种重定向的方法的示意性流程图。
图8是本申请提供的另一种重定向的方法的示意性流程图。
图9是本申请提供的另一种重定向的方法的示意性流程图。
图10是本申请提供的再一种重定向的方法的示意性流程图。
图11是本申请提供的再一种重定向的方法的示意性流程图。
图12是本申请提供的通信装置的示意性结构图。
图13是本申请提供的另一通信装置的示意性结构图。
图14是本申请提供的装置的示意性结构图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
图1示出了应用于本申请提供的一种系统架构100的示意图。如图1所示，该系统架构100包括：移动管理网元110和接入网网元120。可选地，该系统架构100还可以包括移动管理网元130和终端(terminal)140。其中，移动管理网元110为第一系统的移动管理网元，接入网网元120为第一系统的接入网网元，移动管理网元130为第二系统的移动管理网元。第一系统和第二系统为不同的系统。可选地，第一系统可以是5GS，且第二系统为EPS；或者，第一系统可以是EPS，且第二系统为5GS。应理解，第一系统和第二系统也可以为其他系统，本申请不做限定。
上述系统架构100可以用于执行本申请提供的一种的重定向的方法。
具体地，移动管理网元110具体用于：根据第二系统中终端支持的CIOT特性和优选的CIOT特性，确定将终端重定向至所述第二系统；向接入网网元120发送重定向指示信息，所述重定向指示信息用于指示所述接入网网元120将所述终端从第一系统重定向至第二系统；接收来自移动管理网元110的切换需求消息；根据所述切换需求消息，选择移动管理网元130；以及，向移动管理网元130发送第一消息，所述第一消息用于请求将所述终端切换至第二系统。
相应地，接入网网元130用于：接收来自移动管理网元110的重定向指示信息；以及，向移动管理网元110发送切换需求消息。
相应地，移动管理网元130用于：接收来自移动管理网元110的所述第一消息。
因此，移动管理网元110在确定需要将终端重定向到第二系统时，可以通过重定向指示信息指示接入网网元120触发切换流程。接着，接入网网元120可以通过向移动管理网元130发送切换需求消息触发系统间(inter radio access technology，inter-RAT)切换(handover，HO)，以将终端从第一系统切换至第二系统。从而，能够解决两个不同系统之间的重定向问题。并 且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
可选地，上述终端140可以是连接态的终端，并且移动管理网元120和移动管理网元130可以通过N26接口进行通信，但本申请实施例对此不作限定。
可选地，终端140用于：向移动管理网元110发送第二系统中该终端支持的CIOT特性和优选的CIOT特性。相应地，移动管理网元110用于：接收来自终端140的第二系统中该终端支持的CIOT特性和优选的CIOT特性。
可选地，终端140还用于：向移动管理网元130发送第一系统中该终端支持的CIOT特性和优选的CIOT特性。相应地，移动管理网元130用于：接收来自终端140的第一系统中该终端支持的CIOT特性和优选的CIOT特性。
可选地，所述切换需求消息可以包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求。
进一步地，所述第一指示信息具体为重定向至EPC指示(Redirect to EPC Indication)；或者，所述第一指示信息具体为重定向至第五代移动通信系统核心网5GC指示(Redirect to 5GC Indication)或者，所述第一指示信息具体为不同CIOT RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，所述第一指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
可选地，所述第一消息包括第二指示信息，所述第二指示信息用于使移动管理网元130根据第二指示信息，不再将该终端重定向至所述第一系统。
进一步地，所述第二指示信息具体为来自第五代移动通信系统核心网5GC重定向指示(Redirect from 5GC Indication)，或者，所述第二指示信息具体为来自演进分组核心网EPC重定向指示(Redirect from EPC Indication)或者，所述第二指示信息具体为不同CIOT RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，所述第二指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
图2示出了应用本申请提供的一种系统架构200的示意图。如图2所示，该系统架构200包括：终端210和移动管理网元220。可选地，该系统架构200还可以包括接入网网元230。其中，移动管理网元220为第一系统的移动管理网元，接入网网元230为第一系统的接入网网元。第一系统和第二系统为不同的系统。可选地，第一系统可以是5GS，且第二系统为EPS；或者，第一系统可以是EPS，且第二系统为5GS。应理解，第一系统和第二系统也可以为其他系统，本申请不做限定。
上述系统架构200可以用于执行本申请提供的另一种的重定向的方法。
具体地，移动管理网元220用于：根据第二系统中终端支持的CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；向所述终端发送重定向指示信息，所述重定向指示信息用于指示所述终端重定向至所述第二系统。
相应地，终端210用于：接收重定向指示信息，所述重定向指示信息指示所述终端重定向至第二系统，所述终端重定向至所述第二系统是根据所述第二系统中所述终端支持的CIOT特性和优选的CIOT特性确定的；根据所述重定向指示信息选择所述第二系统；向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
因此，在移动管理网元220确定需要对终端210进行重定向时，可以向终端210发送重定向指示信息。终端可以在接收到重定向指示信息后，选择第二系统，然后接入所选择的第二系统。从而，能够解决两个不同系统之间的重定向问题。并且，在第一系统为EPS，且第二系统为5GS的情况下，能够解决终端从EPS到5GS的重定向问题。在第一系统为5GS，且第二系统为EPS的情况下，能够解决终端从5GS到EPS的重定向问题。
可选地，在一种实现方式中，移动管理网元220用于向所述终端发送重定向指示信息，具体包括：移动管理网元向接入网网元230发送该重定向指示信息，然后接入网网元230再向终端发送该重定向指示信息。
具体地，接入网网元230需要对移动管理网元220发送的重定向指示信息解封装，然后再发送给终端210。示例性，移动管理网元可以通过N2消息或者S1-AP消息向接入网网元230发送该重定向指示信息，然后接入网网元再通过AN释放(release)流程或者S1释放流程中向该终端发送的消息携带该重定向指示信息。
可选地，在另一种实现方式中，移动管理网元220直接向终端发送该重定向指示信息。这里的意思是，接入网网元230对该重定向指示信息不进行任何处理，其只进行简单的转发操作。
可选地，终端210还用于：向移动管理网元220发送第二系统中所述终端支持的CIOT特性和优选的CIOT特性。相应地，移动管理网元220用于：接收来自终端210的第二系统中所述终端支持的CIOT特性和优选的CIOT特性
可选地，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述终端至所述第一系统。
可选地，所述第三指示信息具体为来自第五代移动通信系统核心网5GC重定向指示(Redirect from 5GC Indication)；或者，所述第三指示信息具体为来自演进分组核心网EPC重定向指示(Redirect from EPC Indication)；或者，所述第三指示信息具体为不同CIOT RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，所述第三指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
可选地，所述终端禁用第一系统中所述终端支持的CIOT特性。
可选地，所述第二消息不包括第一系统中所述终端支持的CIOT特性和优选的CIOT特性，以使所述第二系统的移动管理网元根据所述第二消息，不再重定向所述终端至所述第一系统。
应理解，本申请实施例中的终端可以指用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端还可以是蜂窝电话、无绳电话、会话启动协议(Session Initiation Protocol，SIP)电话、无线本地环路(Wireless Local Loop，WLL)站、个人数字处理(Personal Digital Assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(Public Land Mobile Network，PLMN)中的终端设备等，本申请实施例对此并不限定。具体地，本申请中的终端可以为CIOT终端。CIOT终端具有成本低、功能简单、低功耗、非频繁用户数据传输的应用特性。
图3示出了EPS的架构图300。如图3所示，架构图300具体可以包括如下网络实体：
1、演进的通用陆地无线网(evolved universal terrestrial radio access network，EUTRAN)：由多个演进型基站(Evolved NodeB，eNodeB)组成的网络，实现无线物理层功能、资源调度和无线资源管理、无线接入控制以及移动性管理功能。eNodeB之间可以通过X2接口相连，可以在基于X2的切换过程中用来传输数据。eNodeB通过用户面接口S1-U和服务网元(serving gateway，SGW)相连，使用通用分组无线系统隧道协议用户面(general packet radio system general tunneling protocol user plane，GTP-U)来传送用户数据；通过控制面接口S1-MME和移动性管理实体(mobility management entity，MME)相连，采用S1-AP协议实现无线接入承载控制等功能。
2、MME：主要负责用户即会话管理的所有控制平面功能，包括非接入层(non-access-stratum，NAS)信令及安全，跟踪区列表的管理(tracking area List)的管理，分组数据网络网关(packet date network gateway，P-GW)与SGW的选择等。
3、SGW：主要负责用户设备的数据传输、转发以及路由切换等，并作为用户设备在eNodeB之间切换时的本地移动性锚定点(对于每一个用户设备，每个时刻仅有一个SGW为之服务)。
4、P-GW：作为分组数据网络(packet date network，PDN)连接的锚定点，负责用户设备的IP地址分配，用户设备的数据报文过滤、速率控制、生成计费信息等。
5、服务GPRS支持节点(serving GPRS supporting node，SGSN)：为2G接入网GSM/EDGE无线接入网(GSM/EDGE radio access network，GERAN)，3G接入网通用陆地无线接入网(universal terrestrial radio access network，UTRAN)与EPS核心网EPC的接入节点，负责从GERAN，UTRAN到EPC承载的建立和数据的转发。
6、归属用户服务器(home subscriber server，HSS)：存储移动用户的签约数据。
7、策略和计费规则功能(policy and charging rules function，PCRF)：负责计费管理和策略控制，包括策略与计费控制(policy and charging control，PCC)规则，服务质量(quality of service，QoS)规则。
图4是示出了5GS架构图400。如图4所示，由5GS由UE，(无线)接入网(radio access network，(R)AN)，核心网(Core)和数据网络(data network，DN)构成。其中，UE，AN，Core是构成架构的主要成分，逻辑上它们可以分为用户面和控制面两部分，控制面负责移动网络的管理，用户面负责业务数据的传输。图中，NG2参考点位于AN控制面和Core控制面之间，NG3参考点位于AN用户面和Core用户面之间，NG6参考点位于Core用户面和数据网络之间。
UE：是移动用户与网络交互的入口，能够提供基本的计算能力，存储能力，向用户显示业务窗口，接受用户操作输入。UE会采用下一代空口技术，与AN建立信号连接，数据连接，从而传输控制信号和业务数据到移动网络。
AN：类似于传统网络里面的基站，部署在靠近UE的位置，为特定区域的授权用户提供入网功能，并能够根据用户的级别，业务的需求等使用不同质量的传输隧道传输用户数据。AN能够管理自身的资源，合理利用，按需为UE提供接入服务，把控制信号和用户数据在UE和核心网之间转发。
Core：负责维护移动网络的签约数据，管理移动网络的网元，为UE提供会话管理，移动性管理，策略管理，安全认证等功能。在UE附着的时候，为UE提供入网认证；在UE有业务请求时，为UE分配网络资源；在UE移动的时候，为UE更新网络资源；在UE空闲的 时候，为UE提供快恢复机制；在UE去附着的时候，为UE释放网络资源；在UE有业务数据时，为UE提供数据路由功能，如转发上行数据到DN；或者从DN接收UE下行数据，转发到AN，从而发送给UE。
DN：是为用户提供业务服务的数据网络，一般客户端位于UE，服务端位于数据网络。数据网络可以是私有网络，如局域网，也可以是不受运营商管控的外部网络，如Internet，还可以是运营商共同部署的专有网络，如为了配置IP多媒体网络子系统(IP multimedia core network subsystem，IMS)服务。
图5是在图4的基础上确定的详细架构，其中核心网用户面包括用户面功能(user plane function，UPF)；核心网控制面包括认证服务器功能(authentication server function，AUSF)，核心网接入和移动性管理功能(core access and mobility management function，AMF)，会话管理功能(session management function，SMF)，网络切片选择功能(network slice selection function，NSSF)，网络开放功能(Network Exposure Function，NEF)网络功能仓储功能(NF repository function，NRF)，统一数据管理(unified data management，UDM)，策略控制功能(policy control function，PCF)，应用功能(application function，AF)。这些功能实体的功能如下：
UPF：根据SMF的路由规则执行用户数据包转发
AUSF：执行UE的安全认证
AMF：UE接入管理和移动性管理
SMF：UE会话管理
NSSF：为UE选择网络切片
NEF：以北向API接口的方式向第三方开放网络功能
NRF：为其他网元提供网络功能实体信息的存储功能和选择功能
UDM：用户签约上下文管理
PCF：用户策略管理
AF:用户应用管理
在图5所示架构中，N1接口为UE与AMF之间的参考点；N2接口为(R)AN和AMF的参考点，用于NAS消息的发送等；N3接口为(R)AN和UPF之间的参考点，用于传输用户面的数据等；N4接口为SMF和UPF之间的参考点，用于传输例如N3连接的隧道标识信息，数据缓存指示信息，以及下行数据通知消息等信息；N6接口为UPF和DN之间的参考点，用于传输用户面的数据等。
需要说明的是，图3至图5中的各个网元之间的接口名称只是一个示例，具体实现中接口的名称可能为其他的名称，本申请实施例对此不作具体限定。图1至图5中包括的各个网元(比如SMF、AF、UPF等)的名称也仅是一个示例，对网元本身的功能不构成限定。在5G网络以及未来其它的网络中，上述各个网元也可以是其他的名称，本申请实施例对此不作具体限定。例如，在6G网络中，上述各个网元中的部分或全部可以沿用5G中的术语，也可能采用其他名称，等等，在此进行统一说明，以下不再赘述。此外，应理解，上述各个网元之间的所传输的消息(或信令)的名称也仅仅是一个示例，对消息本身的功能不构成任何限定。
本申请提供的重定向的方法中的第一系统可以是图3所示的EPS和图5所示的5GS中的一个系统，第二系统可以是图3所示的EPS和图5所示的5GS中的另一系统。具体来讲，本申请中的第一系统可以是EPS，相应地，第二系统为5GS。本申请中的第一系统还可以是5GS， 相应地，第二系统为EPS。但应理解，本申请并不排除第一系统和第二系统还可以是其他现有系统或者未来系统的可能性。在第一系统为EPS，第二系统为5GS的场景中，本申请中的第一系统的移动管理网元可以是MME，第二系统的移动管理网元可以是AMF，第一系统的接入网网元可以是EUTRAN或者EUTRAN中的一个或者多个eNodeB，第二系统的接入网网元可以是(R)AN。当然，若第一系统和第二系统为其他现有系统或者未来系统，则本申请中各网元为这些系统中的相应网元。应理解，本申请中的终端可以是上述所描述的系统中的UE。
为使本领域技术人员更好的理解本申请，下文中分别以终端从5GS重定向至EPS和终端从EPS重定向至5GS为例，对本申请的重定向进行详细介绍。具体地，在终端从5GS重定向至EPS的场景中，第一系统为5GS，第二系统为EPS，终端为UE，第一系统的移动管理网元为AMF，第二系统的移动管理网元为MME，第一系统的接入网网元为S-RAN，第二系统的接入网网元为T-RAN。在终端从EPS重定向至5GS的场景中，终端为UE，第一系统为EPS，第二系统为5GS，第一系统的移动管理网元为MME，第二系统的移动管理网元为AMF，第一系统的接入网网元为S-RAN，第二系统的接入网网元为T-RAN。
图6和图7示出了本申请提供的一种重定向的方法。其中，图6所示的方法可以应用于UE从5GS重定向至EPS的场景，图7所示的方法可以应用于UE从EPS重定向至5GS的场景。进一步地，图6和图7所示的方法可以应用于连接态的UE，并且AMF和MME可以通过N26接口进行通信，但本申请实施例对此不作限定。应理解，图6和图7所示的方法可以应用于上文所描述的系统架构100中。
图6示出了本申请实施例的重定向的方法600的示意性流程图。参见图6，方法600主要包括下述的S604至S612。可选该，该方法600还可以包括S602、S614和/或S616。
S602，UE向AMF发送EPS中该UE支持的CIOT特性和优选的CIOT特性。
具体地，该UE在EPS中支持相应的CIOT特性时，可以将EPS中该UE支持的CIOT特性和优选的CIOT特性注册到AMF。
可选地，EPS中该UE支持的CIOT特性和优选的CIOT特性可以通过注册(registration)流程中的注册请求消息携带。
应理解，UE还可以向AMF发送5GS中该UE支持的CIOT特性和优选的CIOT特性，这样该UE可以将5GS中该UE支持的CIOT特性和优选的CIOT特性注册到AMF。示例性的，5GS中该UE支持的CIOT特性和优选的CIOT特性可以通过上述注册请求消息携带。
本申请中，EPS中UE支持的CIOT特性也称为UE的EPS CIOT能力。类似地，5GS中UE支持的CIOT特性也称为UE的5GS CIOT能力。CIOT特性例如可以是CP优化特和UP优化，该UE支持的CIOT特性可能是CP优化和UP优化二者中的其中一种，也可能二者都支持。但应理解，本申请并不限定对CIOT特性作具体限定。比如，在EPS中，CIOT特性可以是EPS UP优化和EPS UP优化，在5GS中，CIOT特性可以是其他的特性。EPS中该UE优选的CIOT特性为EPS中该UE支持的CIOT特性中的一个或者多个CIOT特性。类似地，5GS中该UE优选的CIOT特性为5GS中该UE支持的CIOT特性中的一个或者多个CIOT特性。优选的CIOT特性是指在UE支持一个到多个CIOT特性时，UE优先使用的特性，举例，如支持UP、CP优化，优选特性是CP优化。
S604，AMF根据EPS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至EPS。
可选地，EPS中该UE支持的CIOT特性和优选的CIOT特性可以通过S602步骤获得，也可以通过其他途径获得，如在切换流程中从5GS获得，本申请实施例对此不作限定。
示例性的，AMF可以根据运营商策略和负载均衡情况确定将该UE重定向至EPS。比如，在5GS检测到AMF负载过高且在EPS中该UE支持CIOT特性时，AMF可以主动将该UE重定向至EPS。此外，AMF还可以参考5GS的接入网网元上报的该UE能够接入的无线接入技术(radio access technology，RAT)信息、该UE所在区域的目标核心网(core network，CN)的负载信息、该UE是否可以接入5GS和/或EPS的签约信息等信息中的一种或者多种，决定将该UE重定向至EPS。
S606，AMF向S-RAN发送重定向指示信息。其中，该重定向指示信息用于指示S-RAN将该UE从5GS重定向至EPS。
可选地，该重定向指示信息可以通过一条N2消息发送，比如N2通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。
S608，S-RAN向AMF发送切换需求消息。其中，切换需求消息可以包括第一指示信息，第一指示信息用于指示发送该切换需求消息的原因是5GS的重定向请求。
具体地，S-RAN接收重定向指示信息后，可以获知AMF需要将该UE重定向至EPS。然后，S-RAN通过向AMF发送切换需求(handover required)消息，触发5GS到EPS切换流程。
可选地，第一指示信息具体为重定向至EPC指示(Redirect to EPC Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
S610，AMF在接收到切换需求消息后，选择MME。
AMF获知发送该切换需求消息的原因是5GS的重定向请求后，根据EPS中该UE支持的CIOT特性和优选的CIOT特性选择MME。
S612，AMF向MME发送第一消息。其中，第一消息用于请求将该UE切换至EPS或者EPC。
在执行S612之后，5GS的相关网元和EPS的相关网元，比如，AMF、S-RAN、MME和T-RAN可以进行后续的切换流程，从而能够将该UE切换该EPS。
可选地，该第一消息可以是重定位请求(relocation request)消息或者重定位完成(relocation complete)消息，但本申请实施例并不仅限于此。
综上，本申请实施例的重定向的方法，AMF确定需要触发UE重定向到EPS后，AMF向S-RAN发送重定向指示信息。S-RAN接收到重定向指示信息后，可以通过向AMF发送切换需求消息，触发切换流程。然后，AMF通过向MME发送第一消息，开始进行切换，从而能够将UE从5GS切换至EPS。因此，本申请实施例的重定向的方法，能够解决UE从5GS到EPS的重定向问题。
可选地，上述第一消息可以包括第二指示信息，第二指示信息用于使MME根据该第二指示信息，不再将该UE重定向至5GS。
应理解，该第二指示信息可以与第一指示信息相同，也可以不同，本申请实施例对此不作限定。比如，该第二指示信息具体为来自5GC重定向指示(Redirect from 5GC Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
相应地，该方法还可以包括：
S614，MME根据该第二指示信息，不再将该UE重定向至5GS。
比如，MME可以根据该第二指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向至5GS。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，EPS或者EPC)后，再重定向回源系统(即，5GS或者5GC)。
可选地，该方法还可以包括：
S616，该UE向MME发送5GS中该UE支持的CIOT特性和优选的CIOT特性。
从而，在需要重定向该UE至5GS时，MME可以根据5GS中该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
示例性地，该UE可以通过TAU流程中的TAU请求消息携带5GS中该UE支持的CIOT特性和优选的CIOT特性。
需要说明的是，本申请并不限定S614和S616的执行顺序。
图7示出了本申请实施例的重定向的方法700的示意性流程图。该方法700主要包括下述的S704至S712。可选该，该方法700还可以包括S702和/或S714。
S702，UE向MME发送5GS中该UE支持的CIOT特性和优选的CIOT特性。
具体地，该UE在5GS中支持相应的CIOT特性时，可以将5GS中该UE支持的CIOT特性和优选的CIOT特性注册到MME。
可选地，5GS中该UE支持的CIOT特性和优选的CIOT特性可以通过附着(attach)流程中的附着请求(attach request)消息或者TAU流程中的TAU请求(request)消息携带。
应理解，UE还可以向AMF发送EPS中该UE支持的CIOT特性和优选的CIOT特性，这样该UE可以将EPS中该UE支持的CIOT特性和优选的CIOT特性注册到MME。示例性的，EPS中该UE支持的CIOT特性和优选的CIOT特性可以通过上述附着请求(attach request)消息或者TAU请求(request)消息携带。
本申请中，EPS中UE支持的CIOT特性也称为UE的EPS CIOT能力。类似地，5GS中UE支持的CIOT特性也称为UE的5GS CIOT能力。CIOT特性例如可以是CP优化特和UP优化，该UE支持的CIOT特性可能是CP优化和UP优化二者中的其中一种，也可能二者都支持。但应理解，本申请并不限定对CIOT特性作具体限定。比如，在EPS中，CIOT特性可以是EPS UP优化和EPS UP优化，在5GS中，CIOT特性可以是其他的特性。EPS中该UE优选的CIOT特性为EPS中该UE支持的CIOT特性中的一个或者多个CIOT特性。类似地，5GS中该UE优选的CIOT特性为5GS中该UE支持的CIOT特性中的一个或者多个CIOT特性。优选的CIOT特性是指在UE支持一个到多个CIOT特性时，UE优先使用的特性，举例，如支持UP、CP优化，优选特性是CP优化。
S704，MME根据5GS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至5GS。
可选地，5GS中该UE支持的CIOT特性和优选的CIOT特性可以通过S702步骤获得，也可以通过其他途径获得，如在切换流程中从EPS获得，本申请实施例对此不作限定。
示例性的，MME可以根据运营商策略和负载均衡情况确定将该UE重定向至5GS。比如，在EPC检测到MME负载过高且在5GS中该UE支持CIOT特性时，MME可以主动将该UE重定向至5GS。此外，MME还可以参考EPS的接入网网元上报的该UE能够接入的RAT信 息、该UE所在区域的目标CN的负载信息、该UE是否可以接入5GS和/或EPS的签约信息等信息中的一种或者多种，决定将该UE重定向至5GS。
S706，MME向S-RAN发送重定向指示信息。其中，该重定向指示信息用于指示S-RAN将该UE从EPS重定向至5GS。
可选地，该重定向指示信息可以通过S1-AP消息发送，比如，S1-AP通知(notify)消息、初始UE上下文建立(Initial UE Context Setup)消息、UE上下文修改(UE Context Modification)消息、UE上下文释放(UE Context Release)消息、或者下行传输(Downlink Transport)消息等。
S708，S-RAN向MME发送切换需求消息。其中，切换需求消息可以包括第一指示信息，第一指示信息用于指示发送该切换需求消息的原因是EPS的重定向请求。
具体地，S-RAN接收重定向指示信息后，可以获知MME需要将该UE重定向至5GS。然后，S-RAN通过向MME发送切换需求(handover required)消息，触发EPS到5GS切换流程。
可选地，切换需求消息可以包括第一指示信息，第一指示信息用于指示发送该切换需求消息的原因是EPS的重定向请求。
进一步地，第一指示信息具体为重定向至5GS指示(Redirect to 5GS Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
S710，MME根据该切换需求消息，选择AMF。
MME获知发送该切换需求消息的原因是EPS的重定向请求后，根据5GS中该UE支持的CIOT特性和优选的CIOT特性选择AMF。
S712，MME向AMF发送第一消息。其中，第一消息用于请求将该UE切换至5GS或者5GC。
在执行S712之后，5GS的相关网元和EPS的相关网元，比如，AMF、S-RAN、MME和T-RAN可以进行后续的切换流程，从而能够将该UE切换该5GS。
可选地，该第一消息可以是重定位请求(relocation request)消息或者重定位完成(relocation complete)消息，但本申请实施例并不仅限于此。
综上，本申请实施例的重定向的方法，MME确定需要触发UE重定向到5GS后，MME向S-RAN发送重定向指示信息。S-RAN接收到重定向指示信息后，可以通过向MME发送切换需求消息，触发切换流程。然后，MME通过向AMF发送第一消息，开始进行切换，从而能够将UE从EPS切换至5GS。因此，本申请实施例的重定向的方法，能够解决UE从EPS到5GS的重定向问题。
可选地，上述第一消息可以包括第二指示信息，第二指示信息用于使AMF根据该第二指示信息，不再将该UE重定向至EPS。
应理解，该第二指示信息可以与第一指示信息相同，也可以不同，本申请实施例对此不作限定。比如，该第二指示信息具体为来自EPC重定向指示(Redirect from EPC Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
相应地，该方法还可以包括：
S714，AMF根据该第二指示信息，不再将该UE重定向至EPS。
比如，AMF可以根据该第二指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向至EPS。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，5GS)后，再重定向回源系统(即，EPS或者EPC)。
可选地，该方法还可以包括：
S716，该UE向AMF发送EPS中该UE支持的CIOT特性和优选的CIOT特性。
从而，在需要重定向该UE至EPS时，AMF可以根据该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
示例性地，该UE可以通过注册流程中的注册请求消息携带EPS中该UE支持的CIOT特性和优选的CIOT特性。
需要说明的是，本申请并不限定S714和S716的执行顺序。
图8和图9示出了根据本申请提供的另一种重定向的方法。其中，图8所示的方法可以应用于UE从5GS重定向至EPS的场景，图9所示的方法可以应用于UE从EPS重定向至5GS的场景。应理解，图8和图9所示的方法可以应用于上文所描述的系统架构200中。
图8示出了本申请实施例的重定向的方法800的示意性流程图。该方法800主要包括下述的S804至S812。可选该，该方法800还可以包括S802和/或S814。
S802，UE向AMF发送EPS中该UE支持的CIOT特性和优选的CIOT特性。
该步骤具体可以参照上文中对S602所作的说明，这里不再赘述。
S804，AMF根据EPS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至EPS。
该步骤具体可以参照上述中对S604所作的说明，这里不再赘述。
S806，AMF向S-RAN发送重定向指示信息。其中，该重定向指示信息用于指示S-RAN将该UE从5GS重定向至EPS。
该步骤具体可以参照上述中对S606所作的说明，这里不再赘述。
S808，S-RAN向该UE发送上述重定向指示信息。
示例性，该S-RAN可以通过接入网(access network，AN)释放(release)流程中向该UE发送的消息携带该重定向指示信息，比如AN连接释放(AN Connection Release)消息。比如，该AN释放流程为通过系统间重定向至EPS的AN释放(AN Release via inter-system redirection to EPS)流程。AN释放(release)流程具体可以参照参见技术，本申请在此不再赘述。
示例性的，该S-RAN可以通过切换流程中向该UE发送的消息携带该重定向指示信息，如切换命令(Handover Command)消息。比如，该切换流程为5GS到EPS的切换流程。5GS到EPS的切换流程具体可以参照参见技术，本申请在此不再赘述。
可以看出，与方法600不同的是，方法800中，S-RAN接收到重定向指示信息后，不向AMF发送切换需求信息以触发切换流程，而是向UE发送该重定向指示信息，触发UE进行后续的流程。
S810，该UE选择EPS或者选择EPC。
具体地，UE选择EPC NAS和EUTRAN小区(cell)，其中，EUTRAN小区连接到的EPC支持UE的CIOT能力和优选的CIOT特性。
S812，该UE向EPS或者EPC发送第二消息，第二消息用于请求接入到EPS。
具体来讲，该UE选择EPS或者EPC后，可以通过向所选择的EPS或者EPC中的MME发送第二消息，请求接入EPS。然后，MME可以根据第二消息可以进行后续相应地接入流程， 从而该UE可以接入EPS。
可选地，第二消息可以为TAU流程中的TAU请求(TAU request)消息或者attach流程中的附着请求(attach request)消息。应理解，相应地，EPS或者EPC可以根据第二消息进行后续的TAU流程或者attach流程，以将该UE接入EPS。
综上，本申请实施例的重定向的方法，AMF确定需要触发UE重定向到EPS后，向S-RAN发送重定向指示信息，接着S-RAN向该UE发送该重定向指示信息。该UE在接收到重定向指示信息后，通过向MME发送第二消息，可以进行到EPS的接入流程，从而能够将该UE接入EPS。因此，本申请实施例的重定向的方法，能够解决UE从5GS到EPS的重定向问题。
可选地，上述第二消息可以包括第三指示信息，第三指示信息用于指示发送第二消息的原因是5GS的重定向请求，以使MME根据所述第三指示信息，不再重定向所述UE至5GS。该第三指示信息可以与方法600中描述的第一指示信息或者第二指示信息相同，也可以不同，本申请实施例对此不作限定。比如，该第三指示信息具体为来自5GC重定向指示(Redirect from 5GC Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
相应地，该方法还可以包括：
S814，MME根据该第三指示信息，不再将该UE重定向至5GS或者5GC。
比如，MME可以根据该第三指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向回5GS或者5GC。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，EPS)后，再重定向回源系统(即，5GS或者5GC)。
可选地，作为本申请一个实施例，UE可以不在第二消息中携带5GS中该UE支持的CIOT特性和优选的CIOT特性，或者禁用5GS的CIOT能力。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，EPS)后，再重定向回源系统(即，5GS或者5GC)。
可选地，上述第二消息还可以包括5GS中该UE支持的CIOT特性和优选的CIOT特性。
从而，在需要重定向该UE至5GS时，MME可以根据5GS中该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
图9示出了本申请实施例的重定向的方法900的示意性流程图。该方法900主要包括下述的S904至S912。可选该，该方法900还可以包括S902和/或S914。
S902，UE向MME发送5GS中该UE支持的CIOT特性和优选的CIOT特性。
该步骤具体可以参照上文中对S702所作的说明，这里不再赘述。
S904，MME根据5GS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至5GS。
该步骤具体可以参照上文中对S704所作的说明，这里不再赘述。
S906，MME向S-RAN发送重定向指示信息。其中，该重定向指示信息用于指示S-RAN将该UE从EPS重定向至5GS。
该步骤具体可以参照上文中对S706所作的说明，这里不再赘述。
S908，S-RAN向该UE发送上述重定向指示信息。
示例性，该S-RAN可以通过S1释放流程中向该UE发送的消息携带该重定向指示信息，如RRC连接释放(RRC Connection Release)消息。S1释放流程具体可以参照参见技术，本申请在此不再赘述。
示例性的，该S-RAN可以通过切换流程中向该UE发送的消息携带该重定向指示信息，如切换命令(Handover Comman)消息。比如，该切换流程为EPS到5GS的切换流程。EPS到5GS的切换流程具体可以参照参见技术，本申请在此不再赘述。
可以看出，与方法700不同的是，方法900中，S-RAN接收到重定向指示信息后，不向MME发送切换需求信息以触发切换流程，而是向UE发送该重定向指示信息，从而触发UE进行接入流程。
S910，该UE选择5GS或者5GC。
具体地，该UE选择5GC NAS和NR cell，其中，NR小区连接到的5GC支持UE的CIOT能力和优选的CIOT特性。
S912，该UE向5GS或者5GC发送第二消息，第二消息用于请求接入到5GS。
具体来讲，该UE选择5GS或者5GC后，可以通过向所选择的5GS或者5GC中的AMF发送第二消息，请求接入5GS。然后，该AMF根据第二消息可以进行后续相应地接入流程，从而该UE可以接入5GS。
可选地，第二消息可以是注册流程中的注册请求(registration request)消息。应理解，相应地，5GS或者5GC根据第二消息进行后续的注册流程以将该UE接入5GS。
综上，本申请实施例的重定向的方法，MME确定需要触发UE重定向到5GS后，向S-RAN发送重定向指示信息，接着S-RAN向该UE发送该重定向指示信息。该UE在接收到重定向指示信息后，通过向AMF发送第二消息，可以进行到5GS的接入流程，从而能够将该UE接入5GS。因此，本申请实施例的重定向的方法，能够解决UE从EPS到5GS的重定向问题。
可选地，上述第二消息可以包括第三指示信息，第三指示信息用于指示发送第二消息的原因是EPS的重定向请求，以使AMF根据所述第三指示信息，不再重定向所述UE至EPC。该第三指示信息可以与方法700中描述的第一指示信息或者第二指示信息相同，也可以不同，本申请实施例对此不作限定。比如，该第三指示信息具体为来自EPC重定向指示(Redirect from EPC Indication)或者不同CIOT RAT之间重定向指示Inter CIOT RAT Redirection。
相应地，该方法还可以包括：
S914，AMF根据该第三指示信息，不再将该UE重定向至EPS或者EPC。
比如，AMF可以根据该第三指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向回EPS或者EPC。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，5GS)后，再重定向回源系统(即，EPS或者EPC)。
可选地，作为本申请一个实施例，UE也可以不在第二消息中携带EPS中该UE支持的CIOT特性和优选的CIOT特性，或者禁用EPS的CIOT能力。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(即，EPS)后，再重定向回源系统(即，EPS或者EPC)。
可选地，上述第二消息还可以包括EPS中该UE支持的CIOT特性和优选的CIOT特性。
从而，在需要重定向该UE至EPS时，AMF可以根据EPS中该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
图10和图11示出了根据本申请提供的再一种重定向的方法。其中，图10所示的方法可以应用于UE从5GS重定向至EPS的场景，图11所示的方法可以应用于UE从EPS重定向至5GS的场景。应理解，图10和图11所示的方法可以应用于上文所描述的系统架构200中。
参见图10，图10示出了本申请实施例的重定向的方法1000的示意性流程图。该方法1000主要包括下述的S1004至S1012。可选该，该方法1000还可以包括S1002和/或S1014。
S1002，UE向AMF发送EPS中该UE支持的CIOT特性和优选的CIOT特性。
该步骤具体可以参照上文中对S602或者S802所作的说明，这里不再赘述。
S1004，AMF根据EPS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至EPS。
该步骤具体可以参照上文中对S604或者S804所作的说明，这里不再赘述。
S1006，AMF向该UE发送重定向指示信息。其中，该重定向指示信息用于指示该UE重定向至EPS。
可选地，该重定向指示信息可以通过去注册、注册或者UE配置(configuration)等流程中，AMF向该UE发送的NAS消息中携带，比如注册响应消息、去注册请求消息或者UE配置更新命令消息。
可以看出，方法800中，AMF首先通过N2消息向S-RAN发送重定向指示信息，然后S-RAN再通过AN释放(release)流程向UE发送该重定向指示信息。而在方法1000中，重定向指示信息是通过NAS消息发送的。
S1008，该UE选择EPS或者选择EPC。
具体地，UE选择EPC NAS和EUTRAN小区(cell)，其中，EUTRAN小区连接到的EPC支持UE的CIOT能力和优选的CIOT特性。S1010，该UE向EPS或者EPC发送第二消息，第二消息用于请求接入到EPS或者EPC。
该步骤具体可以参照上文中对S812所作的说明，这里不再赘述。
综上，本申请实施例的重定向的方法，AMF确定需要触发UE重定向到EPS后，向UE发送重定向指示信息，该UE在接收到重定向指示信息后，选择EPS并进行到EPS的接入流程，从而能够将该UE接入EPS。因此，本申请实施例的重定向的方法，能够解决UE从5GS到EPS的重定向问题。
可选地，作为本申请一个实施例，上述第二消息可以包括第三指示信息。第三指示信息具体可以参照上述方法800中所作的说明，这里不再赘述。
相应地，该方法还可以包括：S1012，MME根据该第三指示信息，不再将该UE重定向至5GS。
比如，MME可以根据该第三指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向回5GS或者5GC。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(EPS或EPC)后，再重定向回源系统(5GS或5GC)。
可选地，上述第二消息还可以包括5GS中该UE支持的CIOT特性和优选的CIOT特性。
从而，在需要重定向该UE至5GS时，MME可以根据5GS中该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
可选地，作为本申请另一实施例，该UE可以禁用5GS中该UE支持的CIOT特性。从而，该UE不会重定向回5GS。
可选地，作为本申请再一实施例，上述第二消息不包括5GS中该UE支持的CIOT特性和优选的CIOT特性。这样，MME不会将该UE重定向回5GS或者5GC。
参见图11，图11示出了本申请实施例的重定向的方法1100的示意性流程图。该方法1100 主要包括下述的S1104至S1112。可选该，该方法1100还可以包括S1102和/或S1114。
S1102，UE向MME发送5GS中该UE支持的CIOT特性和优选的CIOT特性。
该步骤具体可以参照上述中对S702或者S902所作的说明，这里不再赘述。
S1104，MME根据5GS中该UE支持的CIOT特性和优选的CIOT特性，确定将该UE重定向至5GS。
该步骤具体可以参照上述中对S704或者S904所作的说明，这里不再赘述。
S1106，MME向该UE发送重定向指示信息。其中，该重定向指示信息用于指示该UE重定向至5GS。
可选地，该重定向指示信息可以通过去附着(detach)、附着(attach)或者TAU等流程中，MME向该UE发送的NAS消息中携带，如附着响应消息、去附着请求消息或者TAU响应消息。
可以看出，方法900中，MME首先通过S1-AP消息向S-RAN发送重定向指示信息，然后S-RAN再通过S1释放流程向UE发送该重定向指示信息。而在方法1100中，重定向指示信息是通过NAS消息发送的。
S1108，该UE选择5GS或者5GC。
具体地，该UE选择5GC NAS和NR cell，其中，NR小区连接到的5GC支持UE的CIOT能力和优选的CIOT特性。
S1110，该UE向5GS或者5GC发送第二消息，第二消息用于请求接入到5GS。
该步骤具体可以参照上述中对S912所作的说明，这里不再赘述。
综上，本申请实施例的重定向的方法，MME确定需要触发UE重定向到5GS后，向UE发送重定向指示信息，该UE在接收到重定向指示信息后，选择5GS并进行到5GS的接入流程，从而该UE能够将该UE接入5GS或者5GC。因此，本申请实施例的重定向的方法，能够解决UE从EPS到5GS的重定向问题。
可选地，作为本申请一个实施例，上述第二消息可以包括第三指示信息。第三指示信息具体可以参数上述方法900中所作的说明，这里不再赘述。
相应地，该方法还可以包括：S1112，AMF根据该第三指示信息，不再将该UE重定向至EPS。
比如，AMF可以根据该第三指示信息，在一段时间内(例如，预设时间段内)或者网络配置的时间段内不再将该UE重定向至EPS或者EPC。
因此，本申请实施例的重定向的方法，能够防止UE重定向至目标系统(5GS或者5GC)后，再重定向回源系统(EPS或者EPC)。
可选地，上述第二消息还可以包括EPS中该UE支持的CIOT特性和优选的CIOT特性。从而，在需要重定向该UE至EPS时，AMF可以根据EPS中该UE支持的CIOT特性和优选的CIOT特性，进行相关的重定向操作。
可选地，作为本申请另一实施例，该UE可以禁用EPS中该UE支持的CIOT特性。从而，该UE不会重定向回EPS。
可选地，作为本申请再一实施例，上述第二消息不包括EPS中该UE支持的CIOT特性和优选的CIOT特性。这样，AMF不会将该UE重定向回EPS。
应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
上文中结合图1至图11，详细描述了根据本申请实施例的重定向的方法，下面将结合图12至图14，详细描述根据本申请实施例的装置。
图12示出了本申请实施例提供的通信装置1200，所述通信装置1200可以是前述的第一系统的移动管理网元，该通信装置1200包括：处理单元1210，发送单元1220和接收单元1230。
处理单元1210，用于根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；
发送单元1220，用于向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统；
接收单元用于1230，接收来自所述第一系统的接入网网元的切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；
所述处理单元1210还用于，根据所述切换需求消息，选择所述第二系统的移动管理网元；
发送单元1220还用于，向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
可选地，所述第一消息包括第二指示信息，所述第二指示信息用于使所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
应理解，这里的通信装置1200以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中，本领域技术人员可以理解，通信装置1200可以具体为上述方法实施例中的AMF或MME，通信装置1200可以用于执行上述方法实施例中与AMF或MME对应的各个流程和/或步骤，为避免重复，在此不再赘述。
图13示出了本申请实施例提供的通信装置1300，所述通信装置1300可以是前述的UE或者终端，也可以为芯片。该通信装置1300包括：接收单元1310、处理单元1320和发送单元1330。
接收单元1210，用于接收重定向指示信息，所述重定向指示信息用于指示所述通信装置重定向至第二系统，所述通信装置重定向至所述第二系统是根据所述第二系统中所述通信装置支持的蜂窝物联网CIOT特性和优选的CIOT特性确定的；
处理单元1320，用于根据所述重定向指示信息选择所述第二系统；
发送单元1330，用于向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
可选地，所述接收单元1310具体用于：
接收来自第一系统的移动管理网元的所述重定向指示信息；或者
接收来自第一系统的接入网网元的所述重定向指示信息。
可选地，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述通信装置至所述第一系统。
可选地，所述通信装置禁用第一系统中所述通信装置支持的CIOT特性。
可选地，所述第二消息不包括第一系统中所述通信装置支持的CIOT特性和优选的CIOT特性，以使所述第二系统根据所述第二消息，不再重定向所述通信装置至所述第一系统。
应理解，这里的通信装置1300以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中，本领域技术人员可以理解，通信装置1300可以具体为上述方法实施例中的UE，通信装置1300可以用于执行上述方法实施例中与UE对应的各个流程和/或步骤，为避免重复，在此不再赘述。
上述各个方案的通信装置1200和通信装置1300具有实现上述方法中AMF/MME和UE执行的相应步骤的功能；所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块；例如发送单元可以由发射机替代，接收单元可以由接收机替代，其它单元，如确定单元等可以由处理器替代，分别执行各个方法实施例中的收发操作以及相关的处理操作。
在本申请的实施例，图12和图13中的通信装置也可以是芯片或者芯片系统，例如：片上系统(system on chip，SoC)。对应的，接收单元和发送单元可以是该芯片的收发电路，在此不做限定。
应理解，本申请实施例图12中的通信装置或图13中的通信装置可以通过图14中的装置1400来实现，并且可以用于执行上述方法实施例中MME/AMF和UE对应的各个步骤和/或流程。
图14示出了本申请实施例提供的装置1400。该装置1400包括处理器1410、收发器1420和存储器1430。其中，处理器1410、收发器1420和存储器1430通过内部连接通路互相通信，该存储器1430用于存储指令，该处理器1410用于执行该存储器1430存储的指令，以控制该收发器1420发送信号和/或接收信号。
其中，本申请的一种可能的实现方式中，若该装置1400为第一系统的移动管理网元，该处理器1410用于：根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；通过收发器1420向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统；通过收发器1420接收来自所述第一系统的接入网网元的切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；根据所述切换需求消息，选择所述第二系统的移动管理网元；通过收发器1420向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
若该通信装置1400为终端，该处理器1410用于通过收发器1420接收重定向指示信息，所述重定向指示信息用于指示所述通信装置重定向至第二系统，所述通信装置重定向至所述第二系统是根据所述第二系统中所述通信装置支持的蜂窝物联网CIOT特性和优选的CIOT特性确定的；根据所述重定向指示信息选择所述第二系统；通过收发器1420向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
可选地，该存储器1430可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。该处理器1410可以用于执行存储器中存储的指令，并且当该处理器1410执行 存储器中存储的指令时，该处理器1410用于执行上述与终端或第一系统的移动管理网元对应的方法实施例的各个步骤和/或流程。
应理解，上述的收发器可以包括发射机和接收机。收发器还可以进一步包括天线，天线的数量可以为一个或多个。存储器可以是一个单独的器件，也可以集成在处理器中。上述的各个器件或部分器件可以集成到芯片中实现，如集成到基带芯片中实现。
在本申请的实施例，图14中的收发器也可以是通信接口，在此不做限定。
在本申请的各实施例中，为了方面理解，进行了多种举例说明。然而，这些例子仅仅是一些举例，并不意味着是实现本申请的最佳实现方式。
在本申请的各实施例中，为了方便的描述，采用了第一消息，第二消息以及其他各种消息的名称。然而，这些消息仅仅是以举例方式说明需要携带的内容或者实现的功能，消息的具体名称并不对本申请的做出限定，例如：还可以是请求消息，响应消息等。这些消息可以是具体的一些消息，可以是消息中的某些字段。这些消息还可以代表各种服务化操作。
也应理解，在本申请实施例中，上述装置的处理器可以是中央处理单元(central processing unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field-programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件单元组合执行完成。软件单元可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器执行存储器中的指令，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范 围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (38)

  1. 一种重定向的方法，其特征在于，包括：
    第一系统的移动管理网元根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；
    所述第一系统的移动管理网元向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统；
    所述第一系统的移动管理网元接收来自所述第一系统的接入网网元的切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；
    所述第一系统的移动管理网元根据所述切换需求消息，选择所述第二系统的移动管理网元；
    所述第一系统的移动管理网元向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
  2. 如权利要求1所述的方法，其特征在于，所述第一指示信息具体为重定向至演进分组核心网EPC指示Redirect to EPC Indication；或者，
    所述第一指示信息具体为重定向至第五代移动通信系统核心网5GC指示Redirect to 5GCIndication；或者，
    所述第一指示信息具体为不同CIOT无线接入技术RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，
    所述第一指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
  3. 如权利要求1或2所述的方法，其特征在于，所述第一消息包括第二指示信息，所述第二指示信息用于使所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
  4. 如权利要求3所述的方法，其特征在于，所述第二指示信息具体为来自第五代移动通信系统核心网5GC重定向指示Redirect from 5GC Indication；或者，
    所述第二指示信息具体为来自演进分组核心网EPC重定向指示Redirect from EPCIndicat ion；或者，
    所述第二指示信息具体为不同CIOT无线接入技术RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，
    所述第二指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
  5. 一种通信系统，其特征在于，包括第一系统的移动管理网元和所述第一系统的接入网网元，
    所述第一系统的移动管理网元用于：
    根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；
    向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述 第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统；
    所述第一系统的接入网网元用于：
    接收来自所述第一系统的移动管理网元的重定向指示信息，并且向所述第一系统的移动管理网元发送切换需求消息；
    以及，所述第一系统的移动管理网元还用于：
    接收来自所述第一系统的接入网网元的所述切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；
    根据所述切换需求消息，选择所述第二系统的移动管理网元；
    向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
  6. 如权利要求5所述的通信系统，其特征在于，所述第一消息包括第二指示信息，所述第二指示信息用于所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
  7. 一种通信装置，其特征在于，所述通信装置属于第一系统，包括：
    处理单元，用于根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；
    发送单元，用于向所述第一系统的接入网网元发送重定向指示信息，所述重定向指示信息用于指示所述第一系统的接入网网元将所述终端从所述第一系统重定向至所述第二系统；
    接收单元用于，接收来自所述第一系统的接入网网元的切换需求消息，所述切换需求消息包括第一指示信息，所述第一指示信息用于指示发送所述切换需求消息的原因是所述第一系统的重定向请求；
    所述处理单元还用于，根据所述切换需求消息，选择所述第二系统的移动管理网元；
    发送单元还用于，向所述第二系统的移动管理网元发送第一消息，所述第一消息用于请求将所述终端切换至所述第二系统。
  8. 如权利要求7所述的通信装置，其特征在于，所述第一指示信息具体为重定向至演进分组核心网EPC指示Redirect to EPC Indication；或者，
    所述第一指示信息具体为重定向至第五代移动通信系统核心网5GC指示Redirect to 5GC Indication；或者，
    所述第一指示信息具体为不同CIOT无线接入技术RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，
    所述第一指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
  9. 如权利要求7或8所述的通信装置，其特征在于，所述第一消息包括第二指示信息，所述第二指示信息用于使所述第二系统的移动管理网元根据所述第二指示信息，不再将所述终端重定向至所述第一系统。
  10. 一种重定向的方法，其特征在于，包括：
    终端接收来自第一系统的移动管理网元的重定向指示信息；
    所述终端根据所述重定向指示信息，选择第二系统；
    所述终端向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
  11. 如权利要求10所述的方法，其特征在于，在所述终端接收重定向指示信息之前，所述方法还包括：
    所述终端向第一系统的移动管理网元发送所述第二系统中所述终端支持的CIOT特性和优选的CIOT特性。
  12. 如权利要求10或11所述的方法，其特征在于，所述重定向指示信息是所述第一系统的移动管理网元根据所述第二系统中所述终端支持的蜂窝物联网CIOT特性和优选的CIOT特性确定将终端重定向至所述第二系统后发送的。
  13. 如权利要求10至12中任一项所述的方法，其特征在于，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述终端至所述第一系统。
  14. 如权利要求13所述的方法，其特征在于，所述第三指示信息具体为来自第五代移动通信系统核心网5GC重定向指示Redirect from 5GC Indication；或者，
    所述第三指示信息具体为来自演进分组核心网EPC重定向指示Redirect from EPCIndication；或者，
    所述第三指示信息具体为不同CIOT接入技术RAT之间重定向指示CIOT Inter-RAT Rediretion或Inter CIOT RAT Redirection；或者，
    所述第三指示信息具体为不同CIOT系统之间重定向指示CIOT Inter-System Rediretion或Inter CIOT System Redirection。
  15. 如权利要求10至14中任一项所述的方法，其特征在于，所述终端禁用第一系统中所述终端支持的CIOT特性。
  16. 如权利要求10至12以及15中任一项所述的方法，其特征在于，所述第二消息不包括第一系统中所述终端支持的CIOT特性和优选的CIOT特性，以使所述第二系统的移动管理网元根据所述第二消息，不再重定向所述终端至所述第一系统。
  17. 如权利要求10-16中任一项所述的方法，其特征在于，
    在所述第一系统为第五代移动通信系统5GS，所述第二系统为演进分组核心网EPC的情况下，所述第二消息为附着请求消息或跟踪区更新请求消息。
  18. 如权利要求10-16中任一项所述的方法，其特征在于，
    在所述第一系统为演进分组核心网EPC，所述第二系统为第五代移动通信系统5GS的情况下，所述第二消息为注册请求消息。
  19. 如权利要求10-18中任一项所述的方法，其特征在于，所述终端接收来自第一系统的移动管理网元的重定向指示信息，包括：
    终端接收来自所述第一系统的移动管理网元的非接入层消息，所述非接入层消息中携带所述重定向指示信息。
  20. 一种通信系统，其特征在于，包括终端和第一系统的移动管理网元，
    所述第一系统的移动管理网元用于：
    根据第二系统中终端支持的蜂窝物联网CIOT特性和优选的CIOT特性，确定将所述终端重定向至所述第二系统；
    向所述终端发送重定向指示信息；
    以及，所述终端用于：
    接收来自所述第一系统的移动管理网元的所述重定向指示信息；
    向所述第二系统的移动管理网元发送第二消息，所述第二消息用于请求接入到所述第二系统。
  21. 如权利要求20所述的系统，其特征在于，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是所述第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述终端至所述第一系统。
  22. 如权利要求21所述的系统，其特征在于，所述第二消息不包括所述第一系统中所述终端支持和优选的CIOT特性，以使所述第二系统的移动管理网元根据所述第二消息，不再重定向所述终端至所述第一系统。
  23. 如权利要求20-22中任一项所述的系统，其特征在于，在所述第一系统为第五代移动通信系统5GS，所述第二系统为演进分组核心网EPC的情况下，所述第二消息为附着请求消息或跟踪区更新请求消息。
  24. 如权利要求20-22中任一项所述的系统，其特征在于，在所述第一系统为演进分组核心网EPC，所述第二系统为第五代移动通信系统5GS的情况下，所述第二消息为注册请求消息。
  25. 如权利要求20-24中任一项所述的系统，其特征在于，所述第一系统的移动管理网元用于：向所述终端发送非接入层消息，所述非接入层消息中携带所述重定向指示信息。
  26. 一种通信装置，其特征在于，包括：
    接收单元，用于接收来自第一系统的移动管理网元的重定向指示信息；
    处理单元，用于根据所述重定向指示信息选择第二系统；
    发送单元，用于向所述第二系统发送第二消息，所述第二消息用于请求接入到所述第二系统。
  27. 如权利要求26所述通信装置，其特征在于，所述第二消息包括第三指示信息，所述第三指示信息用于指示发送所述第二消息的原因是第一系统的重定向请求，以使所述第二系统的移动管理网元根据所述第三指示信息，不再重定向所述通信装置至所述第一系统。
  28. 如权利要求26或27所述的通信装置，其特征在于，所述通信装置禁用第一系统中所述通信装置支持的CIOT特性。
  29. 如权利要求26或28所述的通信装置，其特征在于，所述第二消息不包括第一系统中所述通信装置支持的CIOT特性和优选的CIOT特性，以使所述第二系统根据所述第二消息，不再重定向所述通信装置至所述第一系统。
  30. 如权利要求26-29任一所述的通信装置，其特征在于，所述重定向指示信息是所述第一系统的移动管理网元根据所述第二系统中所述终端支持的蜂窝物联网CIOT特性和优选的CIOT特性确定将终端重定向至所述第二系统后发送的。
  31. 一种移动管理网元，其特征在于，所述移动管理网元属于第一系统，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述移动管理网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述移动管理网元执行如权利要求1-4任一项所述的重定向的方法。
  32. 一种通信装置，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述通信设备运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述通信设备执行如权利要求10-19任一项所述的重定向的方法。
  33. 一种处理装置，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，以执行如权利要求1-4任一项，或权利要求10-19任一项所述的方法。
  34. 一种处理器，其特征在于，用于执行如权利要求1-4任一项，或权利要求10-19任一项所述的方法。
  35. 一种芯片系统，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，使得安装有所述芯片系统的设备执行如权利要求1-4任一项，或权利要求10-19任一项所述的方法。
  36. 一种计算机可读存储介质，包括计算机程序，当其在计算机上运行时，使得所述计算机执行如权利要求1-4任一项，或权利要求10-19任一项所述的方法。
  37. 一种计算机程序产品，所述计算机程序产品包括计算机程序，当所述计算机程序在计算机上运行时，使得计算机执行如权利要求1-4任一项，或权利要求10-19任一项所述的方法。
  38. 一种用来执行权利要求1-4任一项，或权利要求10-19任一项所述的重定向方法的装置。
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