WO2019024108A1 - 通信方法、网络设备和终端设备 - Google Patents

通信方法、网络设备和终端设备 Download PDF

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Publication number
WO2019024108A1
WO2019024108A1 PCT/CN2017/096082 CN2017096082W WO2019024108A1 WO 2019024108 A1 WO2019024108 A1 WO 2019024108A1 CN 2017096082 W CN2017096082 W CN 2017096082W WO 2019024108 A1 WO2019024108 A1 WO 2019024108A1
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WIPO (PCT)
Prior art keywords
network device
source
target
context information
plmn
Prior art date
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PCT/CN2017/096082
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English (en)
French (fr)
Inventor
刘建华
Original Assignee
Oppo广东移动通信有限公司
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 Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to KR1020207004281A priority Critical patent/KR102316348B1/ko
Priority to EP17919660.5A priority patent/EP3627891B1/en
Priority to PCT/CN2017/096082 priority patent/WO2019024108A1/zh
Priority to US16/625,097 priority patent/US20200169923A1/en
Priority to JP2020503034A priority patent/JP2020534715A/ja
Priority to CN201780092841.1A priority patent/CN110832902A/zh
Publication of WO2019024108A1 publication Critical patent/WO2019024108A1/zh

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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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the embodiments of the present application relate to the field of communications, and, more particularly, to a communication method, a network device, and a terminal device.
  • the network device serving the terminal device establishes corresponding service information for the terminal device.
  • the terminal device needs to restore the connection between the terminal device and the network device by using the handover, and the solution in the prior art has a large network overhead.
  • the embodiments of the present application provide a communication method, a network device, and a terminal device, so as to save terminal power and network overhead, thereby improving terminal mobility.
  • a communication method comprising: moving from a first public land mobile network (PLMN) to a second PLMN or from a first core network to a second core network
  • PLMN public land mobile network
  • the target network device acquires context information of the terminal device; the target network device communicates with the terminal device according to the context information.
  • the target network device can directly obtain the context information of the terminal device without switching, so that the connection with the terminal device can be restored, thereby saving the terminal power and the network. Overhead, thereby improving terminal mobility.
  • the terminal device may be a terminal device in a radio resource control (RRC) idle state and an RRC inactive state.
  • RRC radio resource control
  • the target network device acquires context information of the terminal device, where the target network device receives the context information sent by the terminal device.
  • the method further includes: the target network device sending the first indication information to the terminal device, where the first indication information is used by Instructing the terminal device to release the context information.
  • the method further includes: the target network device receiving the terminal The information about the source network device sent by the device; the target network device acquiring the context information of the terminal device, including: the target network device sending a context acquisition request message to the source network device according to the information of the source network device, the context obtaining request The message is used to request the context information, where the context acquisition request message carries the identifier of the terminal device; the target network device receives the context information sent by the source network device.
  • the target network device is a target core network device
  • the source network device is a source core network device.
  • the method further includes: the target core network device sending the context information to the target access network device.
  • the method further includes: the target core network device sending the second indication information to the source core network device
  • the second indication information is used to indicate that the source core network device releases the context information, or that the source core network device triggers the source access network device to release the context information.
  • the target network device is a target PLMN network device
  • the source network device is a source PLMN network device
  • the method further includes: the target PLMN network device sending the context information to the target access network device.
  • the method further includes: the target PLMN network device sending the third indication information to the source PLMN network device
  • the third indication information is used to indicate that the source PLMN network device releases the context information, or that the source PLMN network device triggers the source access network device to release the context information.
  • the target network device is a target access network device
  • the source network device is a source access network device
  • the method further includes: the target access network device to the target core network device or the target PLMN The network device sends the context information.
  • the method further includes: sending, by the target access network device, the source access network device
  • the fourth indication information is used to indicate that the source access network device releases the context information, or that the source access network device triggers the source core network device to release the context information.
  • the method further includes: the target network device sending, to the terminal device, fifth indication information, where the fifth indication information is used to indicate The target network device has obtained the context information.
  • a communication method comprising: at a terminal device from a first land When the mobile network PLMN moves to or from the first core network to the second core network, the source network device receives a first context acquisition request message sent by the target network device, where the first context acquisition request message is used. Requesting to obtain context information of the terminal device, where the first context acquisition request message carries an identifier of the terminal device; the source network device sends the context information to the target network device.
  • the source network device is a source core network device
  • the target network device is a target core network device
  • the method further includes: the source core network device sending a second context acquisition to the source access network device a request message, the second context acquisition request message is used to request to obtain the context information; the source core network device receives the context information sent by the source access network device.
  • the source network device is a source core network device, where the target network device is a target core network device, and after the source core network device sends the context information to the target core network device, the method further The source core network device receives the first indication information sent by the target core network device, where the first indication information is used to indicate that the source core network device releases the context information, or the source core network device is triggered to trigger the source access network.
  • the device releases the context information; the source core network device releases the context information according to the first indication information, or the source core network device forwards the first indication information to the source access network device.
  • the source network device is a source PLMN network device
  • the target network device is a target PLMN network device
  • the method further includes: the source PLMN network device sending a second context acquisition to the source access network device a request message, the second context acquisition request message is used to request to acquire the context information; the source PLMN network device receives the context information sent by the source access network device.
  • the source network device is a source PLMN network device, where the target network device is a target PLMN network device, after the source PLMN network device sends the context information to the target PLMN network device, the method further The method includes: the source PLMN network device receiving second indication information sent by the target PLMN network device, where the second indication information is used to indicate that the source PLMN network device releases the context information, or that the source PLMN network device triggers a source access network The device releases the context information; the source PLMN network device releases the context information according to the second indication information, or the source PLMN network device forwards the second indication information to the source access network device.
  • the source network device is a source access network device
  • the target network device is a target access network device
  • the method further includes: the source access network device is connected to the source core network device or The source PLMN network device sends a second context acquisition request message, where the second context acquisition request message is used to request to acquire the context information; the source access network device receives the context information sent by the source core network device or the source PLMN network device .
  • the source network device is a source access network device
  • the target network device is a target access network device, after the source access network device sends the context information to the target access network device.
  • the method further includes: the source access network device receiving the third indication information sent by the target access network device, where the third indication information is used to indicate that the source access network device releases the context information, or indicates the source connection
  • the network access device triggers the source core network device or the source PLMN network device to release the context information; the source access network device releases the context information according to the third indication information, or the source access network device sends the context information to the source core network device or
  • the source PLMN network device forwards the third indication information.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • a communication method comprising: in a case where a terminal device moves from a first collateral mobile network PLMN to a second PLMN or moves from a first core network to a second core network, the terminal device Triggering the target network device to obtain context information of the terminal device.
  • the terminal device triggers the target network device to obtain the context information of the terminal device, and the terminal device sends the context information to the target network device.
  • the method further includes: the terminal device receiving the indication information sent by the target network device, where the indication information is used to indicate the terminal The device releases the context information; the terminal device releases the context information according to the indication information.
  • the terminal device triggers the target network device to obtain the context information of the terminal device, where the terminal device sends the information of the source network device to the target network device, so that the target network device is from the source
  • the context information is obtained at the network device.
  • the target network device is a target core network device
  • the source network device is a source core network device
  • the target network device is a target PLMN network device
  • the source network device is a source PLMN network device
  • the target network device is a target access network device
  • the source network device is a source access network device.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • a network device for performing the method of any of the first aspect or the first aspect of the first aspect.
  • the network device comprises means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect.
  • a network device for performing the method of any of the foregoing second aspect or any of the possible implementations of the second aspect.
  • the network device comprises means for performing the method of any of the above-described second or second aspects of the second aspect.
  • a terminal device for performing the method in any of the above possible implementations of the third aspect or the third aspect.
  • the terminal device comprises means for performing the method in any of the possible implementations of the third aspect or the third aspect described above.
  • a network device comprising: a memory, a processor, an input interface, and an output interface.
  • the memory, the processor, the input interface, and the output interface are connected by a bus system.
  • the memory is for storing instructions for executing the memory stored instructions for performing the method of any of the first aspect or the first aspect of the first aspect.
  • a network device comprising: a memory, a processor, an input interface, and an output interface.
  • the memory, the processor, the input interface, and the output interface are connected by a bus system.
  • the memory is for storing instructions for executing the memory stored instructions for performing the method of any of the above-described second aspect or any of the possible implementations of the second aspect.
  • a terminal device comprising: a memory, a processor, an input interface, and an output interface.
  • the memory, the processor, the input interface, and the output interface are connected by a bus system.
  • the memory is for storing instructions for executing the memory stored instructions for performing the method of any of the above-described third aspect or any of the possible implementations of the third aspect.
  • a tenth aspect a computer storage medium for storing a method in performing any of the above first aspect or the first aspect, or any possible implementation of the second aspect or the second aspect
  • a computer program product comprising instructions, when executed on a computer, causes the computer to perform the method of any of the above-described first aspect or any of the alternative implementations of the first aspect, or The method of any of the alternative implementations of the second aspect or the second aspect, or the method of any of the foregoing third aspect or the optional implementation of the third aspect.
  • FIG. 1 is a schematic diagram showing an implementation environment involved in an embodiment of the present application.
  • FIG. 2 shows a schematic flow chart of a method of cell handover.
  • FIG. 3 is a schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 4 is another schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 5 is still another schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 6 is still another schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 7 is still another schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 8 is still another schematic block diagram of a communication method provided by an embodiment of the present application.
  • FIG. 9 is a schematic block diagram of a network device provided by an embodiment of the present application.
  • FIG. 10 is another schematic block diagram of a network device provided by an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a terminal device provided by an embodiment of the present application.
  • FIG. 12 is still another schematic block diagram of a network device provided by an embodiment of the present application.
  • FIG. 13 is still another schematic block diagram of a network device provided by an embodiment of the present application.
  • FIG. 14 is another schematic flowchart of a terminal device provided by an embodiment of the present application.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • SCMA Sparse Code Multiple Access
  • LDS Low Density Signature
  • SCMA systems and LDS systems can also be called other in the field of communications.
  • the technical solution of the embodiment of the present invention can be applied to a multi-carrier transmission system using a non-orthogonal multiple access technology, for example, using orthogonal orthogonal frequency division (OFDM) orthogonal frequency division multiplexing (Orthogonal Frequency Division) Multiplexing, OFDM), Filter Bank Multi-Carrier (FBMC), Generalized Frequency Division Multiplexing (GFDM), Filtered Orthogonal Frequency Division Multiplexing (Filtered-OFDM, F-OFDM) System, etc.
  • OFDM orthogonal orthogonal frequency division
  • OFDM Orthogonal frequency division multiplexing
  • FBMC Filter Bank Multi-Carrier
  • GFDM Generalized Frequency Division Multiplexing
  • Filtered-OFDM Filtered-OFDM, F-OFDM
  • FIG. 1 is a schematic diagram showing an implementation environment involved in an embodiment of the present application.
  • the implementation environment includes: a terminal device 110, an access network device 120, and a core network device 130.
  • the S1 interface is used for communication between the access network device and the core network device
  • the X2 interface is used for communication between the access network devices
  • the Uu interface is used for communication between the terminal device and the access network device.
  • the terminal device 110 may communicate with one or more core networks via a Radio Access Network (RAN), and the terminal device may be referred to as an access terminal or a user equipment (User Equipment, UE). ), subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.
  • the access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), with wireless communication.
  • the access network device 120 is a network element in the access network. As shown in FIG. 1 , in the case of a Universal Mobile Telecommunications System (UMTS), the access network device 120 may be a base station (Node Base, NB) or a radio network controller (Radio Network Controller, RNC). ). In an LTE wireless network architecture, the base station may be an Evolved Node Base station (eNB).
  • eNB Evolved Node Base station
  • the core network device 130 is a network element in a core network (Core Network, CN). Taking the LTE wireless network architecture as an example, the core network device 130 includes a Mobility Management Entity (MME), a Serving Gateway (S-GW), and a PDN Gateway (P-GW).
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • P-GW PDN Gateway
  • the MME is mainly used to complete the mobility management and session management of the terminal device 110.
  • the S-GW is mainly used to forward data between the eNB and the P-GW.
  • P-GW is mainly responsible for Handling Internet Protocol (IP) data services.
  • IP Internet Protocol
  • the network device that serves the terminal device establishes corresponding service information for the terminal device.
  • PLMN Public Land Mobile Network
  • the terminal device needs to switch to restore the connection between the terminal device and the network device.
  • FIG. 2 shows a schematic flow chart of a method of cell handover.
  • the method shown in Figure 2 includes:
  • the terminal completes an initial access process with the source access network device (the access network device to which the source cell belongs). At this time, the terminal enters the connected state from the idle state.
  • the source access network device obtains a context session of the terminal by establishing a context session with the MME to which the terminal belongs.
  • the source access network device stores context information of the terminal.
  • the terminal completes a measurement process of the neighboring cell.
  • the terminal measures the measurement object according to the configuration information sent by the source access network device, and sends a measurement report to the source access network device, so that the access network device can determine whether the terminal performs cell handover according to the measurement report.
  • the source access network device determines that the terminal needs to be handed over, the source access network device sends a handover request to the target access network device, where the handover request carries context information of the terminal.
  • the target access network device stores context information of the terminal.
  • the target access network device sends an acknowledgement handover request to the source access network device.
  • the source access network device switches the terminal to the target access network device.
  • the target access network device transfers the S1 path from the source access network device to the target access network device.
  • the target access network device sends a path change request to the core network element, in order to notify the core network element to transfer the service of the terminal to the target access network device, and update the user plane and The node relationship of the control plane.
  • the terminal device moves from the cell covered by the source access network device to the cell covered by the target access network device, and the terminal device restores the connection between the terminal device and the access network entity by using a handover manner.
  • the terminal device needs to notify the source access network device first, and then the source access network device requests the handover from the target access network device, and carries the context information of the terminal device, and the terminal device needs to perform multiple times with the source access network device. Interaction can restore connectivity and consume more energy.
  • the terminal may perform autonomous mobility without handover through the connection state, and the mobile method used is similar to cell selection or cell reselection in the LTE network. That is, the terminal moves autonomously according to the parameters set by the network and does not inform the network (the difference from the handover).
  • the context information of the terminal device may be stored in the terminal device itself or an access network device or a core network device or a PLMN device device previously served for the terminal device, where the terminal device needs to be
  • the current network device may acquire the context information of the terminal device from the terminal device or the previous network device, so as to resume the transmission.
  • system and “network” are used interchangeably herein.
  • the term “and/or” in this context is merely an association describing the associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and both A and B exist, respectively. B these three situations.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • FIG. 3 shows a schematic block diagram of a communication method 300 of an embodiment of the present application. As shown in FIG. 3, the communication method 300 includes some or all of the following contents:
  • the target network device acquires context information of the terminal device when the terminal device moves from the first common land mobile network PLMN to the second PLMN or moves from the first core network to the second core network.
  • the target network device communicates with the terminal device according to the context information.
  • the embodiment of the present application may be applicable to the connection between the terminal device and the target network device, but the context information of the terminal device is stored in the source network device.
  • the network device storing the context information of the terminal device may be used as the present application.
  • Source network device in an embodiment.
  • the network device in the embodiment of the present application may be either an access network device or a core network device, or may also be a PLMN network device. That is, the source network device and the target network device may be different access network devices, or the source network device and the target network device may be different core network devices, or the source network device and the target network device may be different PLMN networks.
  • the core network to which the device belongs may be the same or different.
  • the functions implemented by the PLMN network device are similar to those implemented by the core network device.
  • the core network device is mainly described below as an example, and the PLMN network device may refer to the specific implementation of the core network device.
  • the terminal device may establish a context information of the terminal device by not performing signaling interaction with the network device.
  • the target network device may obtain the context information of the terminal device from the terminal device or the source network device, for example, if the terminal device needs to send uplink data, and the context information of the terminal device is stored at the terminal device device, the terminal device
  • the context information can be directly sent to the target access network device, so that the network device can quickly resume transmission with the terminal device, and the terminal device can directly send the uplink data to the network device.
  • the target network device can directly acquire the context information of the terminal device without switching, so that the terminal device can be restored. Inter-connection to save terminal power and network overhead, thereby improving terminal mobility.
  • the context information of the terminal device may be stored at the terminal device, the source access network device, and the source core network device. That is, the target network device can obtain the context information of the terminal device from any of the terminal device, the source access network device, and the source core network device.
  • FIG. 4 shows a schematic flow chart of the communication method 10 of the embodiment of the present application.
  • the method 10 is applicable to a scenario in which context information of a terminal device is stored at a terminal device. As shown in FIG. 4, the method 10 includes some or all of the following:
  • the terminal device may directly send the context information of the terminal device to the target access network device if it can determine that it moves to a different core network.
  • the target access network device may forward the context information of the terminal device to the target core network device.
  • the terminal device may also directly send the context information of the terminal device to the target core network device if it determines that it moves to a different core network.
  • the target access network device may send the indication information to the terminal device, indicating that the terminal device releases the context information.
  • the target core network device may also send indication information to the terminal device, indicating that the terminal device releases the context information.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be determined.
  • the implementation process of the embodiment of the present application constitutes any limitation.
  • FIG. 5 shows a schematic flow chart of the communication method 20 of the embodiment of the present application.
  • the method 20 is applicable to a scenario in which context information of a terminal device is stored at a source access network device. As shown in FIG. 5, the method 20 includes some or all of the following:
  • the terminal device may send some information of the source access network device to the target access network device, where the information can be found by the target access network device, where the terminal device can find the source access network device.
  • the information may be an identifier assigned by the core network device to the source access network device, or may be a path identifier of the terminal device and the source access network device, or a path identifier of the core network device and the source access network device, and any identifier source.
  • the access network device can be used as the identification information in the embodiment of the present application, and the present invention is not limited thereto.
  • the target access network device may send a context acquisition request message to the source access network device.
  • the context acquisition request message may carry the terminal device.
  • the identification information for example, the identification information of the terminal device may be an identifier allocated by the source access network device for the terminal device, or may be a Globally Unique Temporary UE Identity (GUTI), or may be an international mobile subscriber identity.
  • GUI Globally Unique Temporary UE Identity
  • Other terminal identifiers such as the International Mobile Subscriber Identification Number (IMSI), can identify the terminal device as the identification information of the embodiment of the present application.
  • IMSI International Mobile Subscriber Identification Number
  • the source access network device may first search for the context information of the terminal device according to the identifier information of the carried terminal device, and then send the found context information to the Target access network device.
  • the target access network device may select to forward the context information to the target core network device.
  • the target core network device may send the indication information to the source core network device, where the source core network device triggers the source access network device to release the terminal device. Contextual information.
  • the source core network device may send the indication information to the source access network device, indicating that the source access network device releases the context information of the terminal device.
  • the target access network device may directly instruct the source access network device to release the context information of the terminal device after receiving the context information of the terminal device sent by the source access network device.
  • the target access network device may also send the indication information to the terminal device, and may notify the terminal device that the target access network device has acquired the context of the terminal device.
  • the information that is, the notification terminal device, the target access network device is ready to communicate with the terminal device.
  • the target core network device may also send the indication information to the terminal device, and may notify the terminal device that the target core network device has obtained the context information of the terminal device. That is, the terminal device is notified that the target core network device is ready to communicate with the terminal device.
  • the terminal device may directly report the information of the source core network device to the target core network device, and the target core network device may send a context acquisition request message to the source core network device according to the reported information of the source core network device.
  • the core network device may directly forward the context acquisition request message to the source access network device, or may resend another context acquisition request message to the source access network, and the context core network device sends the context to the source access network device.
  • the request message may be an identifier of the terminal device, which may be different from the identifier of the terminal device carried in the context acquisition request message sent by the target core network device to the source core network device, or may not carry the identifier of the terminal device.
  • the embodiment of the present application is not limited at all.
  • the source access network device may send the context information of the terminal device to the source core network device, and the source core network device may further forward the context information to the target core network device. Further, the target core network device can forward the context information to the target access network device.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • FIG. 6 shows a schematic flowchart of a communication method 30 of an embodiment of the present application.
  • the method 30 is applicable to a scenario in which context information of a terminal device is stored at a source core network device. As shown in FIG. 6, the method 30 includes some or all of the following:
  • the terminal device may send some information of the source core network device to the target access network device, where the information can be found by the target access network device, where the information can be found by the target access network device.
  • the target core network device may send a context acquisition request message to the source core network device, optionally acquiring the request message in the context.
  • the identifier information of the terminal device may be carried.
  • the identifier information of the terminal device may be an identifier allocated by the source access network device for the terminal device, or may be a GUTI, or other terminal identifiers such as an IMSI, and any device that can identify the terminal device. It can be used as the identification information of the embodiment of the present application.
  • the source core network device may first search for the context information of the terminal device according to the identifier information of the carried terminal device, and then send the found context information to the target core. Network equipment.
  • the target core network device may select to forward the context information to the target access network device.
  • the target core network device may send the indication information to the source core network device, and the source core network device directly releases the context information of the terminal device.
  • the target access network device may also send indication information to the source access network device, indicating that the source access network device triggers the source core network device to release the terminal device. Contextual information.
  • the source access network device may directly send the indication information to the source core network device, indicating that the context information is released.
  • the target access network device may send the indication information to the terminal device, and may notify the terminal device that the target access network device has obtained the context information of the terminal device. That is, the terminal device is notified that the target access network device is ready to communicate with the terminal device.
  • the target core network device may also send the indication information to the terminal device, and may notify the terminal device that the target core network device has obtained the context information of the terminal device, That is, the terminal device is notified that the target core network device is ready to communicate with the terminal device.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • the foregoing method 10, method 20, and method 30 are described in terms of storing context information in the context of a device, and embodiments of the present application are not limited thereto.
  • the context of the terminal device The information may be stored in the terminal device and the source access network device, and the terminal device may directly send the context information of the terminal device to the target core network device, and the terminal device may also send some of the source access network device to the target access network device. Information, so that the target access network device obtains context information of the terminal device from the source access network device.
  • the context information of the terminal device or the information of the source network device that is sent by the terminal device to the target network device may be carried in the random access request message, that is, the resource request for uplink transmission is sent to the target access network device.
  • the terminal device may be in an idle state, but the terminal device or the source access network device or the source core network device (PLMN network device) stores the context information of the terminal device, and the terminal device may also be in the radio resource control. (Radio Resource Control, RRC) in the inactive state, but the terminal device or the source access network device or the source core network device (PLMN network device) stores the context information of the terminal device, and the status of the terminal device in this application Not limited.
  • RRC Radio Resource Control
  • FIG. 7 shows a schematic block diagram of a communication method 400 of an embodiment of the present application. As shown in FIG. 7, the method 400 includes some or all of the following:
  • the source network device receives the first context acquisition request message sent by the target network device,
  • the first context acquisition request message is used to request acquisition of context information of the terminal device, where the first context acquisition request message carries an identifier of the terminal device;
  • the source network device sends the context information to the target network device.
  • the source network device sends the context information of the terminal device to the target after receiving the context acquisition request message sent by the target network device.
  • the network device can restore the connection between the terminal device and the network device, thereby saving terminal power and network overhead, thereby improving terminal mobile performance.
  • the source network device is a source core network device
  • the target network device is a target core network device
  • the method further includes: the source core network device sends a second to the source access network device. a context acquisition request message, the second context acquisition request message is used to request to acquire the context information; and the source core network device receives the context information sent by the source access network device.
  • the source network device is a source core network device, where the target network device is a target core network device, where the source core network device sends the target core network device to the target core network device.
  • the method further includes: the source core network device receiving the first indication information sent by the target core network device, where the first indication information is used to indicate that the source core network device releases the context information, or indicates the source core
  • the network device triggers the source access network device to release the context information.
  • the source core network device releases the context information according to the first indication information, or the source core network device forwards the first indication information to the source access network device.
  • the source network device is a source PLMN network device
  • the target network device is a target PLMN network device
  • the method further includes: the source PLMN network device sends a second to the source access network device. a context acquisition request message, the second context acquisition request message is used to request to acquire the context information; and the source PLMN network device receives the context information sent by the source access network device.
  • the source network device is a source PLMN network device, where the target network device is a target PLMN network device, after the source PLMN network device sends the context information to the target PLMN network device,
  • the method further includes: the source PLMN network device receiving the second indication information sent by the target PLMN network device, the second indication information being used to indicate that the source PLMN network device releases the context information, or indicating that the source PLMN network device triggers the source connection
  • the network device releases the context information; the source PLMN network device releases the context information according to the second indication information, or the source PLMN network device forwards the second indication information to the source access network device.
  • the source network device is a source access network device
  • the target network device is a target access network device
  • the method further includes: the source access network device to the source core network device or The source PLMN network device sends a second context acquisition request message, where the second context acquisition request message is used to request to acquire the context information; the source access network device receives the context information sent by the source core network device or the source PLMN network device .
  • the source network device is a source access network device
  • the target network device is a target access network device
  • the source access network device sends the context to the target access network device.
  • the method further includes: receiving, by the source access network device, third indication information that is sent by the target access network device, where the third indication information is used to indicate that the source access network device releases the context information, or indicates the
  • the source access network device triggers the source core network device or the source PLMN network device to release the context information; the source access network device releases the context information according to the third indication information, or the source access network device sends the context information to the source core network
  • the device or the source PLMN network device forwards the third indication information.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • the interaction between the network device described by the source network device and the target network device and related features, functions, and the like correspond to related characteristics and functions of the target network device. That is, what information is sent by the target network device to the source network device, and what information is received by the source network device accordingly. For the sake of brevity, it will not be repeated here.
  • the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be implemented in the present application.
  • the implementation of the examples constitutes any limitation.
  • FIG. 8 shows a schematic block diagram of a communication method 500 of an embodiment of the present application. As shown in FIG. 8, the method 500 includes some or all of the following:
  • the terminal device In a case where the terminal device moves from the first common land mobile network PLMN to the second PLMN or moves from the first core network to the second core network, the terminal device triggers the target network device to acquire the context information of the terminal device.
  • the terminal device after the terminal device moves to a different PLMN or a different core network, the terminal device triggers the target access network device to acquire the context information of the terminal device, so as to restore the relationship between the terminal device and the network device. Connect to save terminal power and network overhead, thereby improving terminal mobility.
  • the terminal device triggers the target network device to obtain the context information of the terminal device, where the terminal device sends the context information to the target network device.
  • the method further includes: the terminal device receiving the indication information sent by the target network device, where the indication information is used to indicate The terminal device releases the context information; the terminal device releases the context information according to the indication information.
  • the terminal device triggers the target network device to obtain the context information of the terminal device, where the terminal device sends the information of the source network device to the target network device, so that the target network device The context information is obtained at the source network device.
  • the target network device is a target core network device
  • the source network device is a source core network device
  • the target network device is a target PLMN network device
  • the source network device is a source PLMN network.
  • the device, or the target network device is a target access network device
  • the source network device is a source access network device.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • the communication method according to the embodiment of the present application is described in detail above.
  • the communication device according to the embodiment of the present application will be described below with reference to FIG. 6 to FIG. 11.
  • the technical features described in the method embodiment are applicable to the following device embodiments.
  • FIG. 9 shows a schematic block diagram of a network device 600 of an embodiment of the present application.
  • the network device is a target network device.
  • the network device 600 includes:
  • the obtaining unit 610 is configured to acquire context information of the terminal device when the terminal device moves from the first common land mobile network PLMN to the second PLMN or moves from the first core network to the second core network;
  • the communication unit 620 is configured to communicate with the terminal device according to the context information.
  • the target network device can directly acquire the context information of the terminal device without switching, so that the terminal device can be restored. Inter-connection to save terminal power and network overhead, thereby improving terminal mobility.
  • the acquiring unit is specifically configured to: receive the context information sent by the terminal device.
  • the network device further includes: a first sending unit, configured to send the first indication information to the terminal device, where the first indication information is used to indicate that the terminal device releases the context information.
  • the network device further includes: a first receiving unit, configured to receive information about the source network device sent by the terminal device; the acquiring unit is specifically configured to: according to the information of the source network device And sending a context acquisition request message to the source network device, where the context acquisition request message is used to request the context information, where the context acquisition request message carries the identifier of the terminal device; and the context information sent by the source network device is received.
  • a first receiving unit configured to receive information about the source network device sent by the terminal device
  • the acquiring unit is specifically configured to: according to the information of the source network device And sending a context acquisition request message to the source network device, where the context acquisition request message is used to request the context information, where the context acquisition request message carries the identifier of the terminal device; and the context information sent by the source network device is received.
  • the target network device is a target core network device
  • the source network device is a source core network device
  • the network device further includes: a second sending unit, configured to target the network device Send the context information.
  • the network device further includes: a third sending unit, configured to send the second indication information to the source core network device, where the second indication information is used to indicate that the source core network device is released The context information, or indicating that the source core network device triggers the source access network device to release the context information.
  • a third sending unit configured to send the second indication information to the source core network device, where the second indication information is used to indicate that the source core network device is released The context information, or indicating that the source core network device triggers the source access network device to release the context information.
  • the target network device is a target PLMN network device
  • the source network device is a source PLMN network device
  • the network device further includes: a fourth sending unit, configured to target the network device Send the context information.
  • the network device further includes: a fifth sending unit, configured to send, to the source PLMN network device, third indication information, where the third indication information is used to indicate that the source PLMN network device is released.
  • the context information, or indicating that the source PLMN network device triggers the source access network device to release the context information.
  • the target network device is a target access network device
  • the source network device is a source access network device
  • the network device further includes: a sixth sending unit, configured to target the core network The device or the target PLMN network device sends the context information.
  • the network device further includes: a seventh sending unit, configured to send fourth indication information to the source access network device, where the fourth indication information is used to indicate the source access network
  • the device releases the context information, or instructs the source access network device to trigger the source core network device to release the context information.
  • the network device further includes: an eighth sending unit, configured to send, to the terminal device, fifth indication information, where the fifth indication information is used to indicate that the target network device has obtained the Contextual information.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • the network device 600 may correspond to the target network device in the method embodiment of the present application, and the foregoing and other operations and/or functions of the respective units in the network device 600 are respectively implemented in the method of FIG. The corresponding process of the target network device is not described here for brevity.
  • FIG. 10 shows a schematic block diagram of a network device 700 of an embodiment of the present application.
  • the network device is a source network device.
  • the network device 700 includes:
  • the first receiving unit 710 is configured to receive the target network when the terminal device moves from the first common land mobile network PLMN to the second PLMN or moves from the first core network to the second core network.
  • the first context acquisition request message is sent to request the acquisition of the context information of the terminal device, where the first context acquisition request message carries the identifier of the terminal device:
  • the first sending unit 720 is configured to send the context information to the target network device.
  • the source network device sends the context information of the terminal device to the target after receiving the context acquisition request message sent by the target network device.
  • the network device can restore the connection between the terminal device and the network device, thereby saving terminal power and network overhead, thereby improving terminal mobile performance.
  • the source network device is a source core network device or a source PLMN network device
  • the target network device is a target core network device or a target PLMN network device
  • the network device further includes: a unit, configured to send a second context acquisition request message to the source access network device, where the second context acquisition request message is used to request to obtain the context information
  • the second receiving unit is configured to receive the Contextual information.
  • the source network device is a source core network device or a source PLMN network device
  • the target network device is a target core network device or a target PLMN network device
  • the network device further includes: a third receiving a unit, configured to receive the first indication information sent by the target core network device, where the first indication information is used to indicate that the source core network device releases the context information, or that the source core network device triggers the source access network device to release the Context information, or for receiving the first indication information sent by the target PLMN network device, the first indication information is used to indicate that the source PLMN network device releases the context information, and the first release unit is configured to use, according to the first indication information, And releasing the context information, or the third sending unit, configured to forward the first indication information to the source access network device.
  • the source network device is a source access network device
  • the target network device is a target access network device
  • the network device further includes: a fourth sending unit, configured to send to the source core network The device or the source PLMN network device sends a second context acquisition request message, where the second context acquisition request message is used to request to obtain the context information
  • the fourth receiving unit is configured to receive the source core network device or the source PLMN network device The context information.
  • the source network device is a source access network device
  • the target network device is a target access network device
  • the network device further includes: a fifth receiving unit, configured to receive the target interface a third indication information sent by the network access device, where the third indication information is used to indicate that the source access network device releases the context information, or that the source access network device triggers the source core network device or source
  • the PLMN network device releases the context information
  • the second release unit is configured to release the context information according to the third indication information
  • the fifth sending unit is configured to forward the first to the source core network device or the source PLMN network device Three instructions.
  • the terminal device is a terminal device that is in a radio resource control RRC inactive state.
  • the network device 700 may correspond to the source network device in the method embodiment of the present application, and the foregoing and other operations and/or functions of the respective units in the network device 700 are respectively implemented in the method of FIG. 4
  • the corresponding process of the target network device is not described here for brevity.
  • FIG. 11 shows a schematic block diagram of a terminal device 800 of an embodiment of the present application.
  • the terminal device 800 includes:
  • a determining unit 810 configured to determine that the terminal device moves from the first common land mobile network PLMN to the second PLMN or from the first core network to the second core network;
  • the triggering unit 820 is configured to trigger the target network device to acquire context information of the terminal device.
  • the terminal device in the embodiment of the present application moves the terminal device to a different PLMN or a different core network, and the terminal device triggers the target access network device to acquire the context information of the terminal device, so as to restore the relationship between the terminal device and the network device. Connect to save terminal power and network overhead, thereby improving terminal mobility.
  • the triggering unit is specifically configured to: send the context information to the target network device.
  • the terminal device further includes: a receiving unit, configured to receive indication information that is sent by the target network device, where the indication information is used to indicate that the terminal device releases the context information; The context information is released according to the indication information.
  • the triggering unit is specifically configured to: send information of the source network device to the target network device, so that the target network device obtains the context information from the source network device.
  • the target network device is a target core network device
  • the source network device is a source core network device
  • the target network device is a target PLMN network device
  • the source network device is a source PLMN network.
  • the device, or the target network device is a target access network device
  • the source network device is a source access network device.
  • the terminal device is in the radio resource control RRC non- Active terminal device.
  • terminal device 800 may correspond to the terminal device in the method embodiment of the present application, and the foregoing and other operations and/or functions of the respective units in the terminal device 800 respectively implement the target in the method of FIG. 5
  • the corresponding process of the network device is not described here for brevity.
  • the embodiment of the present application further provides a network device 900, which may be the network device 600 in FIG. 9, which can be used to execute the content of the network device corresponding to the method 300 in FIG. .
  • the network device 900 includes an input interface 910, an output interface 920, a processor 930, and a memory 940.
  • the input interface 910, the output interface 920, the processor 930, and the memory 940 can be connected by a bus system.
  • the memory 940 is for storing programs, instructions or code.
  • the processor 930 is configured to execute a program, an instruction or a code in the memory 940 to control the input interface 910 to receive a signal, control the output interface 920 to transmit a signal, and complete the operations in the foregoing method embodiments.
  • the network device in the embodiment of the present application can directly obtain the context information of the terminal device without switching the terminal device to the different PLMNs or different core networks, so that the connection with the terminal device can be restored. To save terminal power and network overhead, thereby improving terminal mobility.
  • the processor 930 may be a central processing unit (CPU), and the processor 930 may also be other general-purpose processors, digital signal processors, application specific integrated circuits, and ready-made Program gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 940 can include read only memory and random access memory and provides instructions and data to the processor 930. A portion of the memory 940 can also include a non-volatile random access memory. For example, the memory 940 can also store information of the device type.
  • each content of the above method may be completed by an integrated logic circuit of hardware in the processor 930 or an instruction in a form of software.
  • the content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 940, and the processor 930 reads the information in the memory 940 and combines it
  • the hardware completes the contents of the above method. To avoid repetition, it will not be described in detail here.
  • the first receiving unit in the network device 600 can be implemented by the input interface 910 in FIG. 12, and the first to eighth transmitting units in the network device 600 can be output interface 920 in FIG.
  • the acquisition unit in network device 600 can be implemented by processor 930 in FIG.
  • the embodiment of the present application further provides a network device 1000, which may be the network device 700 in FIG. 10, which can be used to execute the content of the network device corresponding to the method 400 in FIG. .
  • the network device 1000 includes an input interface 1010, an output interface 1020, a processor 1030, and a memory 1040.
  • the input interface 1010, the output interface 1020, the processor 1030, and the memory 1040 can be connected by a bus system.
  • the memory 1040 is for storing programs, instructions or codes.
  • the processor 1030 is configured to execute a program, an instruction or a code in the memory 1040 to control the input interface 1010 to receive a signal, control the output interface 1020 to send a signal, and complete the operations in the foregoing method embodiments.
  • the network device in the embodiment of the present application sends the context information of the terminal device to the target network device after receiving the context acquisition request message sent by the target network device, after the terminal device moves to a different PLMN or a different core network.
  • the connection between the terminal device and the network device can be restored to save the terminal power and network overhead, thereby improving the terminal mobile performance.
  • the processor 1030 may be a central processing unit (CPU), and the processor 1030 may also be other general-purpose processors, digital signal processors, application specific integrated circuits, and ready-made Program gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 1040 can include read only memory and random access memory and provides instructions and data to the processor 1030. A portion of the memory 1040 may also include a non-volatile random access memory. For example, the memory 1040 can also store information of the device type.
  • each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 1030 or an instruction in a form of software.
  • the content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1040, and the processor 1030 reads the information in the memory 1040.
  • the content of the above method is completed in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the first to fifth receiving units in the network device 700 may be implemented by the input interface 1010 in FIG. 13, and the first to fifth sending units in the network device 700 may be configured by FIG.
  • the output interface 1020 is implemented, and the first release unit and the second release unit in the network device 700 can be implemented by the processor 1030 in FIG.
  • the embodiment of the present application further provides a terminal device 2000, which may be the terminal device 800 in FIG. 11, which can be used to execute the content of the terminal device corresponding to the method 500 in FIG. .
  • the terminal device 2000 includes an input interface 2010, an output interface 2020, a processor 2030, and a memory 2040.
  • the input interface 2010, the output interface 2020, the processor 2030, and the memory 2040 can be connected through a bus system.
  • the memory 2040 is for storing programs, instructions or code.
  • the processor 2030 is configured to execute a program, an instruction or a code in the memory 2040 to control the input interface 2010 to receive a signal, control the output interface 2020 to transmit a signal, and complete the operations in the foregoing method embodiments.
  • the terminal device in the embodiment of the present application moves the terminal device to a different PLMN or a different core network, and the terminal device triggers the target access network device to acquire the context information of the terminal device, so as to restore the relationship between the terminal device and the network device. Connect to save terminal power and network overhead, thereby improving terminal mobility.
  • the processor 2030 may be a central processing unit (CPU), and the processor 2030 may also be other general-purpose processors, digital signal processors, application specific integrated circuits, and ready-made Program gate arrays or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and more.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the memory 2040 can include read only memory and random access memory and provides instructions and data to the processor 2030. A portion of the memory 2040 may also include a non-volatile random access memory. For example, the memory 2040 can also store information of the device type.
  • each content of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 2030 or an instruction in a form of software.
  • the content of the method disclosed in the embodiments of the present application may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 2040, and the processor 2030 reads the information in the memory 2040.
  • the content of the above method is completed in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the receiving unit in the terminal device 800 can be implemented by the output interface 2010 in FIG. 14, and the trigger unit, the releasing unit, and the determining unit in the terminal device 800 can be implemented by the processor 2030 in FIG.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • 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 to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • This functionality if implemented as a software functional unit and sold or used as a standalone product, can be stored on a computer readable storage medium.
  • the technical solution of the present application which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including Several instructions are used to make a computer device (which can be a personal computer, a server, Either a network device or the like) performs all or part of the steps of various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请实施例公开了一种通信方法、网络设备和终端设备，该方法包括：在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，目标网络设备获取该终端设备的上下文信息；该目标网络设备根据该上下文信息，与该终端设备进行通信。本申请实施例的通信方法、网络设备，能够节省终端电量与网络开销，从而提高终端移动性能。

Description

通信方法、网络设备和终端设备 技术领域
本申请实施例涉及通信领域，并且更具体地，涉及一种通信方法、网络设备和终端设备。
背景技术
现有长期演进(Long Term Evolution，LTE)系统中，终端设备在与网络建立连接后，为终端设备服务的网络设备会为该终端设备建立相应业务信息。当正在使用网络服务的终端设备移动时，为了保证通信的连续性和服务质量，终端设备需要通过切换来恢复终端设备与网络设备之间的连接，现有技术中的方案网络开销大。
发明内容
有鉴于此，本申请实施例提供了一种通信方法、网络设备和终端设备，以节省终端电量与网络开销，从而提高终端移动性能。
第一方面，提供了一种通信方法，该方法包括：在终端设备从第一公共陆地移动网络(Public Land Mobile Network，PLMN)移动到第二PLMN或从第一核心网移动到第二核心网的情况下，目标网络设备获取该终端设备的上下文信息；该目标网络设备根据该上下文信息，与该终端设备进行通信。
在终端设备移动到不同的PLMN或者不同的核心网下，目标网络设备可以与终端设备不进行切换直接获取终端设备的上下文信息，从而能够恢复与终端设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，该终端设备可以为处于无线资源控制(Radio Resource Control，RRC)空闲态、RRC非激活态的终端设备。
在一种可能的实现方式中，该目标网络设备获取该终端设备的上下文信息，包括：该目标网络设备接收该终端设备发送的该上下文信息。
在一种可能的实现方式中，在该目标网络设备接收该终端设备发送的该上下文信息之后，该方法还包括：该目标网络设备向该终端设备发送第一指示信息，该第一指示信息用于指示该终端设备释放该上下文信息。
在一种可能的实现方式中，该方法还包括：该目标网络设备接收该终端 设备发送的源网络设备的信息；该目标网络设备获取该终端设备的上下文信息，包括：该目标网络设备根据该源网络设备的信息，向该源网络设备发送上下文获取请求消息，该上下文获取请求消息用于请求该上下文信息，该上下文获取请求消息携带该终端设备的标识；该目标网络设备接收该源网络设备发送的该上下文信息。
在一种可能的实现方式中，该目标网络设备为目标核心网设备，该源网络设备为源核心网设备，该方法还包括：该目标核心网设备向目标接入网设备发送该上下文信息。
在一种可能的实现方式中，在该目标核心网设备接收到该源核心网设备发送的该上下文信息之后，该方法还包括：该目标核心网设备向该源核心网设备发送第二指示信息，该第二指示信息用于指示该源核心网设备释放该上下文信息，或指示该源核心网设备触发源接入网设备释放该上下文信息。
在一种可能的实现方式中，该目标网络设备为目标PLMN网络设备，该源网络设备为源PLMN网络设备，该方法还包括：该目标PLMN网络设备向目标接入网设备发送该上下文信息。
在一种可能的实现方式中，在该目标PLMN网络设备接收到该源PLMN网络设备发送的该上下文信息之后，该方法还包括：该目标PLMN网络设备向该源PLMN网络设备发送第三指示信息，该第三指示信息用于指示该源PLMN网络设备释放该上下文信息，或指示该源PLMN网络设备触发源接入网设备释放该上下文信息。
在一种可能的实现方式中，该目标网络设备为目标接入网设备，该源网络设备为源接入网设备，该方法还包括：该目标接入网设备向目标核心网设备或目标PLMN网络设备发送该上下文信息。
在一种可能的实现方式中，在该目标接入网设备接收到该源接入网设备发送的该上下文信息之后，该方法还包括：该目标接入网设备向该源接入网设备发送第四指示信息，该第四指示信息用于指示该源接入网设备释放该上下文信息，或指示该源接入网设备触发源核心网设备释放该上下文信息。
在一种可能的实现方式中，在该目标网络设备获取该终端设备的上下文信息之后，该方法还包括：该目标网络设备向该终端设备发送第五指示信息，该第五指示信息用于指示该目标网络设备已获取到该上下文信息。
第二方面，提供了一种通信方法，该方法包括：在终端设备从第一共陆 地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，源网络设备接收目标网络设备发送的第一上下文获取请求消息，该第一上下文获取请求消息用于请求获取终端设备的上下文信息，该第一上下文获取请求消息携带该终端设备的标识；该源网络设备向该目标网络设备发送该上下文信息。
在一种可能的实现方式中，该源网络设备为源核心网设备，该目标网络设备为目标核心网设备，该方法还包括：该源核心网设备向源接入网设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源核心网设备接收该源接入网设备发送的该上下文信息。
在一种可能的实现方式中，该源网络设备为源核心网设备，该目标网络设备为目标核心网设备，在该源核心网设备向该目标核心网设备发送该上下文信息之后，该方法还包括：该源核心网设备接收该目标核心网设备发送的第一指示信息，该第一指示信息用于指示该源核心网设备释放该上下文信息，或指示该源核心网设备触发源接入网设备释放该上下文信息；该源核心网设备根据该第一指示信息，释放该上下文信息，或该源核心网设备向该源接入网设备转发该第一指示信息。
在一种可能的实现方式中，该源网络设备为源PLMN网络设备，该目标网络设备为目标PLMN网络设备，该方法还包括：该源PLMN网络设备向源接入网设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源PLMN网络设备接收该源接入网设备发送的该上下文信息。
在一种可能的实现方式中，该源网络设备为源PLMN网络设备，该目标网络设备为目标PLMN网络设备，在该源PLMN网络设备向该目标PLMN网络设备发送该上下文信息之后，该方法还包括：该源PLMN网络设备接收该目标PLMN网络设备发送的第二指示信息，该第二指示信息用于指示该源PLMN网络设备释放该上下文信息，或指示该源PLMN网络设备触发源接入网设备释放该上下文信息；该源PLMN网络设备根据该第二指示信息，释放该上下文信息，或该源PLMN网络设备向该源接入网设备转发该第二指示信息。
在一种可能的实现方式中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，该方法还包括：该源接入网设备向源核心网设备或 源PLMN网络设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源接入网设备接收该源核心网设备或该源PLMN网络设备发送的该上下文信息。
在一种可能的实现方式中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，在该源接入网设备向该目标接入网设备发送该上下文信息之后，该方法还包括：该源接入网设备接收该目标接入网设备发送的第三指示信息，该第三指示信息用于指示该源接入网设备释放该上下文信息，或指示该源接入网设备触发源核心网设备或源PLMN网络设备释放该上下文信息；该源接入网设备根据该第三指示信息，释放该上下文信息，或该源接入网设备向该源核心网设备或该源PLMN网络设备转发该第三指示信息。
在一种可能的实现方式中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
第三方面，提供了一种通信方法，该方法包括：在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，该终端设备触发目标网络设备获取该终端设备的上下文信息。
在一种可能的实现方式中，该终端设备触发目标网络设备获取该终端设备的上下文信息，包括：该终端设备向该目标网络设备发送该上下文信息。
在一种可能的实现方式中，在该终端设备向该目标网络设备发送该上下文信息之后，该方法还包括：该终端设备接收该目标网络设备发送的指示信息，该指示信息用于指示该终端设备释放该上下文信息；该终端设备根据该指示信息，释放该上下文信息。
在一种可能的实现方式中，该终端设备触发目标网络设备获取该终端设备的上下文信息，包括：该终端设备向该目标网络设备发送源网络设备的信息，以便于该目标网络设备从该源网络设备处获取该上下文信息。
在一种可能的实现方式中，该目标网络设备为目标核心网设备，该源网络设备为源核心网设备，或该目标网络设备为目标PLMN网络设备，该源网络设备为源PLMN网络设备，或该目标网络设备为目标接入网设备，该源网络设备为源接入网设备。
在一种可能的实现方式中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
第四方面，提供了一种网络设备，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。具体地，该网络设备包括用于执行上述第一方面或第一方面的任意可能的实现方式中的方法的单元。
第五方面，提供了一种网络设备，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。具体地，该网络设备包括用于执行上述第二方面或第二方面的任意可能的实现方式中的方法的单元。
第六方面，提供了一种终端设备，用于执行上述第三方面或第三方面的任意可能的实现方式中的方法。具体地，该终端设备包括用于执行上述第三方面或第三方面的任意可能的实现方式中的方法的单元。
第七方面，提供了一种网络设备，该网络设备包括：存储器、处理器、输入接口和输出接口。其中，存储器、处理器、输入接口和输出接口通过总线系统相连。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，用于执行上述第一方面或第一方面的任意可能的实现方式中的方法。
第八方面，提供了一种网络设备，该网络设备包括：存储器、处理器、输入接口和输出接口。其中，存储器、处理器、输入接口和输出接口通过总线系统相连。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，用于执行上述第二方面或第二方面的任意可能的实现方式中的方法。
第九方面，提供了一种终端设备，该终端设备包括：存储器、处理器、输入接口和输出接口。其中，存储器、处理器、输入接口和输出接口通过总线系统相连。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，用于执行上述第三方面或第三方面的任意可能的实现方式中的方法。
第十方面，提供了一种计算机存储介质，用于储存为执行上述第一方面或第一方面的任意可能的实现方式中的方法，或者上述第二方面或第二方面的任意可能的实现方式中的方法，或者上述第三方面或第三方面的任意可能的实现方式中的方法所用的计算机软件指令，其包含用于执行上述方面所设计的程序。
第十一方面，提供了一种包括指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述第一方面或第一方面的任一可选的实现方式中的方法，或者上述第二方面或第二方面的任一可选的实现方式中的方法，或者上述第三方面或第三方面的任一可选的实现方式中的方法。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1示出了本申请实施例所涉及的一种实施环境的示意图。
图2示出了小区切换的方法的示意性流程图。
图3示出了本申请实施例提供的通信方法的示意性框图。
图4示出了本申请实施例提供的通信方法的另一示意性框图。
图5示出了本申请实施例提供通信方法的再一示意性框图。
图6示出了本申请实施例提供通信方法的再一示意性框图。
图7示出了本申请实施例提供通信方法的再一示意性框图。
图8示出了本申请实施例提供通信方法的再一示意性框图。
图9示出了本申请实施例提供的网络设备的示意性框图。
图10示出了本申请实施例提供的网络设备的另一示意性框图。
图11示出了本申请实施例提供的终端设备的示意性流程图。
图12示出了本申请实施例提供的网络设备的再一示意性框图。
图13示出了本申请实施例提供的网络设备的再一示意性框图。
图14示出了本申请实施例提供的终端设备的另一示意性流程图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。
应理解，本发明实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(Global System of Mobile communication，GSM)系统、码分多址(Code Division Multiple Access，CDMA)系统、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)系统、通用分组无线业务(General Packet Radio Service，GPRS)、长期演进(Long Term Evolution，LTE)系统、LTE频分双工(Frequency Division Duplex，FDD)系统、LTE时分双工(Time Division Duplex，TDD)、通用移动通信系统(Universal Mobile Telecommunication System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统或未来的新无限(New Radio，NR)系统等。
特别地，本发明实施例的技术方案可以应用于各种基于非正交多址接入 技术的通信系统，例如稀疏码多址接入(Sparse Code Multiple Access，SCMA)系统、低密度签名(Low Density Signature，LDS)系统等，当然SCMA系统和LDS系统在通信领域也可以被称为其他名称；进一步地，本发明实施例的技术方案可以应用于采用非正交多址接入技术的多载波传输系统，例如采用非正交多址接入技术正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)、滤波器组多载波(Filter Bank Multi-Carrier，FBMC)、通用频分复用(Generalized Frequency Division Multiplexing，GFDM)、滤波正交频分复用(Filtered-OFDM，F-OFDM)系统等。
图1示出了本申请实施例所涉及的一种实施环境的示意图。该实施环境包括：终端设备110、接入网设备120和核心网设备130。其中，S1接口用于接入网设备与核心网设备之间的通信，X2接口用于接入网设备之间的通信，Uu接口用于终端设备与接入网设备之间的通信。
在本申请实施例中，终端设备110可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，该终端设备可称为接入终端、用户设备(User Equipment，UE)、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。接入终端可以是蜂窝电话、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、可穿戴设备以及未来5G(5th Generation)网络中的终端设备。
接入网设备120为接入网中的网元。如图1所示，以通用移动通信系统(Universal Mobile Telecommunications System，UMTS)为例，接入网设备120可以是基站(Node Base，NB)，也可以是无线网络控制器(Radio Network Controller，RNC)。在LTE无线网络架构中，基站可以为演进型基站(Evolved Node Base station，eNB)。
核心网设备130为核心网(Core Network，CN)中的网元。以LTE无线网络架构为例，核心网设备130包括移动性管理实体(Mobility Management Entity，MME)，服务网关(Serving Gateway，S-GW)和分组数据网关(PDN Gateway，P-GW)。MME主要用于完成终端设备110的移动性管理和会话管理。S-GW主要用于负责转发eNB与P-GW间的数据。P-GW主要用于负责 处理网间协议(Internet Protocol，IP)数据业务。
现有长期演进LTE系统中，终端设备在与网络建立连接后，为终端设备服务的网络设备会为该终端设备建立相应业务信息。当正在使用网络服务的终端设备从一个陆地移动网络(Public Land Mobile Network，PLMN)移动到另一个PLMN或者从一个核心网移动到另一个核心网时，为了保证通信的连续性和服务质量，终端设备需要通过切换来恢复终端设备与网络设备之间的连接。
为了便于理解，先结合图2简单介绍小区切换的方法。图2示出了小区切换的方法的示意性流程图。图2所示的方法包括：
201、终端完成与源接入网设备(源小区所属接入网设备)间的初始接入过程。此时，该终端从空闲态进入连接态。
202、源接入网设备通过与该终端所属的MME建立上下文会话，获取该终端的上下文信息。
203、源接入网设备存储该终端的上下文信息。
204、终端完成邻小区的测量过程。该终端根据源接入网设备发送的配置信息，对测量对象进行测量，并向源接入网设备发送测量报告，以使接入网设备可以根据测量报告确定该终端是否进行小区切换。
205、当源接入网设备确定该终端需要切换时，该源接入网设备向目标接入网设备发送切换请求，该切换请求携带该终端的上下文信息。
206、目标接入网设备存储该终端的上下文信息。
207、目标接入网设备向源接入网设备发送确认切换请求。
208、源接入网设备将终端切换到目标接入网设备。
209、将S1路径从源接入网设备转移到目标接入网设备。当终端接入目标接入网设备后，目标接入网设备会向核心网网元发送路径更换请求，目的是通知核心网网元将终端的业务转移到目标接入网设备，更新用户面和控制面的节点关系。
由上述方案中可知，终端设备从源接入网设备覆盖的小区移动到目标接入网设备覆盖的小区内，终端设备是通过切换的方式恢复终端设备与接入网实体之间的连接，换句话说，终端设备需要先通知源接入网设备，由源接入网设备再向目标接入网设备请求切换，并携带终端设备的上下文信息，终端设备需要与源接入网设备进行多次交互才能恢复连接，消耗了较多的能量。
在LTE演进及未来无线系统研究中，终端在连接态时可以不通过切换进行自主移动，使用的移动方法类似于LTE网络中的小区选择或小区重选。即终端根据网络设置的参数，自主进行移动且并不告知网络(与切换的区别)。在终端移动到不同的核心网或不同的PLMN下，终端设备的上下文信息可能存储在终端设备本身或者之前为终端设备服务的接入网设备或核心网设备或PLMN设备设备，在终端设备需要在当前核心网或PLMN下进行数据传输时，当前的网络设备可以从终端设备处或者之前的网络设备处获取终端设备的上下文信息，以便恢复传输。
应理解，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
图3示出了本申请实施例的通信方法300的示意性框图。如图3所示，该通信方法300包括以下部分或全部内容：
S310，在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，目标网络设备获取该终端设备的上下文信息；
S320，该目标网络设备根据该上下文信息，与该终端设备进行通信。
本申请实施例可以适用于终端设备与目标网络设备连接，但该终端设备的上下文信息存储在源网络设备中，换句话说，只要存储有该终端设备的上下文信息的网络设备都可以作为本申请实施例中的源网络设备。
应理解，本申请实施例中的网络设备既可以是接入网设备，又可以核心网设备，或者还可以是PLMN网络设备。也就是说，源网络设备与目标网络设备可以是不同的接入网设备，或者源网络设备与目标网络设备可以是不同的核心网设备，或者源网络设备与目标网络设备可以是不同的PLMN网络设备，其所属的核心网可以相同也可以不同。还应理解，在本申请实施例中，PLMN网络设备实现的功能与核心网设备实现的功能类似，下面主要以核心网设备为例进行描述，而PLMN网络设备可以参考核心网设备的具体实现。
具体地，终端设备若确定自己当前移动的核心网或者PLMN与之前的不同，终端设备可以不通过与网络设备的信令交互来建立终端设备的上下文信 息，目标网络设备可以从终端设备处或者源网络设备处来获取终端设备的上下文信息，例如，若终端设备有上行数据需要发送时，并且终端设备的上下文信息存储在终端设备设备处，终端设备就可以直接向目标接入网设备发送其上下文信息，这样的话，网络设备就可以很快地与终端设备恢复传输，那么终端设备就可以直接向网络设备发送上行数据了。
因此，本申请实施例的通信方法，在终端设备移动到不同的PLMN或者不同的核心网下，目标网络设备可以与终端设备不进行切换直接获取终端设备的上下文信息，从而能够恢复与终端设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，终端设备的上下文信息可以存储在终端设备处、源接入网设备处以及源核心网设备处。也就是说，目标网络设备可以从终端设备处、源接入网设备处以及源核心网设备处中的任何一处来获取终端设备的上下文信息。
下面将结合图4至图6分别描述目标网络设备从终端设备处、从源接入网设备处以及从源核心网处获取终端设备的上下文信息的具体流程。
图4示出了本申请实施例的通信方法10的示意性流程图。该方法10适用于终端设备的上下文信息存储在终端设备处的场景。如图4所示，该方法10包括以下部分或全部内容：
S11，终端设备在可以确定自身移动到不同的核心网的情况下，可以直接向目标接入网设备发送该终端设备的上下文信息。
S12，目标接入网设备可以在接收到终端设备发送的终端设备的上下文信息之后，将该终端设备的上下文信息转发给目标核心网设备。
S13，终端设备也可以在确定自身移动到不同地核心网的情况下，也可以直接向目标核心网设备发送该终端设备的上下文信息。
S14，目标接入网设备在接收到终端设备发送的该终端设备的上下文信息之后，可以向终端设备发送指示信息，指示该终端设备释放上下文信息。
S15，目标核心网设备在接收到终端设备或目标接入网设备转发的上下文信息之后，也可以向终端设备发送指示信息，指示该终端设备释放上下文信息。
应理解，在本申请的各种实施例中，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。
图5示出了本申请实施例的通信方法20的示意性流程图。该方法20适用于终端设备的上下文信息存储在源接入网设备处的场景。如图5所示，该方法20包括以下部分或全部内容：
S21，终端设备在可以确定自身移动到不同的核心网的情况下，可以向目标接入网设备发送源接入网设备的一些信息，该信息能够由目标接入网设备找到源接入网设备。例如，该信息可以是核心网设备为源接入网设备分配的标识，也可以是终端设备与源接入网设备的路径标识或核心网设备与源接入网设备的路径标识，任何标识源接入网设备的都可以作为本申请实施例中的标识信息，本发明对此不够成限定。
S22，目标接入网设备在接收到该源接入网设备的信息之后，就可以向源接入网设备发送上下文获取请求消息，可选地，在该上下文获取请求消息中可以携带终端设备的标识信息，例如该终端设备的标识信息可以是源接入网设备为终端设备分配的标识，也可以是全球唯一临时UE标识(Globally Unique Temporary UE Identity，GUTI)，也可以是国际移动用户识别码(International Mobile Subscriber Identification Number，IMSI)等其他终端标识，任何能够标识终端设备的都可以作为本申请实施例的标识信息。
S23，源接入网设备在接收到目标接入网设备发送的上下文获取请求消息之后，可以根据携带的终端设备的标识信息首先查找该终端设备的上下文信息，进而将查找到的上下文信息发送给目标接入网设备。
S24，目标接入网设备在接收到源接入网设备发送的终端设备的上下文信息之后，目标接入网设备可以选择将该上下文信息转发给目标核心网设备。
S25，目标核心网设备在接收到目标接入网设备转发的终端设备的上下文信息之后，可以选择向源核心网设备发送指示信息，指示源核心网设备触发源接入网设备释放该终端设备的上下文信息。
S26，源核心网设备接收到目标核心网设备发送的指示信息之后，源核心网设备可以向源接入网设备发送指示信息，指示源接入网设备释放该终端设备的上下文信息。
S27，目标接入网设备也可以在接收到源接入网设备发送的终端设备的上下文信息之后直接指示源接入网设备释放该终端设备的上下文信息。
S28，目标接入网设备在接收到源接入网设备发送的终端设备的上下文信息之后，也可以向终端设备发送指示信息，可以通知终端设备目标接入网设备已经获取到该终端设备的上下文信息，也就是通知终端设备目标接入网设备已经做好了与终端设备进行通信的准备。
S29，目标核心网设备在接收到目标接入网设备转发的终端设备的上下文信息之后，也可以向终端设备发送指示信息，可以通知终端设备目标核心网设备已经获取到该终端设备的上下文信息，也就是通知终端设备目标核心网设备已经做好了与终端设备进行通信的准备。
可选地，终端设备也可以直接向目标核心网设备上报源核心网设备的信息，那么目标核心网设备就可以根据上报的源核心网设备的信息向源核心网设备发送上下文获取请求消息，源核心网设备可以直接向源接入网设备转发该上下文获取请求消息，也可以重新向源接入网发送另外一个上下文获取请求消息，而源核心网设备向源接入网设备发送的该上下文获取请求消息中可以终端设备的标识，该标识可以与目标核心网设备向源核心网设备发送的上下文获取请求消息中携带的终端设备的标识不同，也可以相同，也可以不携带终端设备的标识，本申请实施例不作任何限定。源接入网设备在接收到源核心网设备发送的上下文获取请求消息之后，可以将终端设备的上下文信息发送给源核心网设备，源核心网设备进而可以将该上下文信息转发给目标核心网设备，进一步的，目标核心网设备就可以向目标接入网设备转发该上下文信息。
应理解，在本申请的各种实施例中，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。
图6示出了本申请实施例的通信方法30的示意性流程图。该方法30适用于终端设备的上下文信息存储在源核心网设备处的场景。如图6所示，该方法30包括以下部分或全部内容：
S31，终端设备在可以确定自身移动到不同的核心网的情况下，可以向目标接入网设备发送源核心网设备的一些信息，该信息能够由目标接入网设备找到源接入网设备。
S32，目标核心网设备在接收到该源核心网设备的信息之后，就可以向源核心网设备发送上下文获取请求消息，可选地，在该上下文获取请求消息 中可以携带终端设备的标识信息，例如该终端设备的标识信息可以是源接入网设备为终端设备分配的标识，也可以是GUTI，也可以是IMSI等其他终端标识，任何能够标识终端设备的都可以作为本申请实施例的标识信息。
S33，源核心网设备在接收到目标核心网设备发送的上下文获取请求消息之后，可以根据携带的终端设备的标识信息首先查找该终端设备的上下文信息，进而将查找到的上下文信息发送给目标核心网设备。
S34，目标核心网设备在接收到源核心网设备发送的终端设备的上下文信息之后，目标核心网设备可以选择将该上下文信息转发给目标接入网设备。
S35，目标核心网设备在接收到目标接入网设备转发的终端设备的上下文信息之后，可以选择向源核心网设备发送指示信息，指示源核心网设备直接释放该终端设备的上下文信息。
S36，目标接入网设备在接收到目标核心网设备转发的终端设备的上下文信息之后，也可以向源接入网设备发送指示信息，指示源接入网设备触发源核心网设备释放该终端设备的上下文信息。
S37，源接入网设备在接收到目标接入网设备发送的指示由其触发源核心网释放上下文信息的指示信息之后，可以直接向源核心网设备发送指示信息，指示释放上下文信息。
S38，目标接入网设备在接收到目标核心网设备转发的终端设备的上下文信息之后，可以向终端设备发送指示信息，可以通知终端设备目标接入网设备已经获取到该终端设备的上下文信息，也就是通知终端设备目标接入网设备已经做好了与终端设备进行通信的准备。
S39，目标核心网设备在接收到源核心网设备发送的终端设备的上下文信息之后，也可以向终端设备发送指示信息，可以通知终端设备目标核心网设备已经获取到该终端设备的上下文信息，也就是通知终端设备目标核心网设备已经做好了与终端设备进行通信的准备。
应理解，在本申请的各种实施例中，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。
应理解，上述方法10、方法20以及方法30是以上下文信息存储在一个设备的角度描述的，本申请实施例应不限于此。例如，终端设备的上下文信 息可以存储终端设备和源接入网设备处，那么终端设备可以向目标核心网设备处直接发送该终端设备的上下文信息，终端设备也可以向目标接入网设备发送源接入网设备的一些信息，以便于目标接入网设备从源接入网设备处获取该终端设备的上下文信息。
还应理解，上述是以核心网设备为例进行描述的，由于PLMN网络设备与核心网设备的功能类似，这里不再赘述。
还应理解，终端设备向目标网络设备发送的终端设备的上下文信息或者源网络设备的信息可以承载于随机接入请求消息，即向目标接入网设备发出上行发送的资源请求。此时终端设备可以是处于空闲态，但该终端设备或源接入网设备或源核心网设备(PLMN网络设备)中保存有该终端设备的上下文信息，该终端设备也可以是处于无线资源控制(Radio Resource Control，RRC)非激活态下，但该终端设备或源接入网设备或源核心网设备(PLMN网络设备)中保存有该终端设备的上下文信息，本申请对该终端设备的状态不作限定。
图7示出了本申请实施例的通信方法400的示意性框图。如图7所示，该方法400包括以下部分或全部内容：
S410，在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，源网络设备接收目标网络设备发送的第一上下文获取请求消息，该第一上下文获取请求消息用于请求获取终端设备的上下文信息，该第一上下文获取请求消息携带该终端设备的标识；
S420，该源网络设备向该目标网络设备发送该上下文信息。
因此，本申请实施例的通信方法，在终端设备移动到不同的PLMN或者不同的核心网下，源网络设备在接收到目标网络设备发送的上下文获取请求消息后将终端设备的上下文信息发送给目标网络设备，即可恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，该源网络设备为源核心网设备，该目标网络设备为目标核心网设备，该方法还包括：该源核心网设备向源接入网设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源核心网设备接收该源接入网设备发送的该上下文信息。
可选地，在本申请实施例中，该源网络设备为源核心网设备，该目标网络设备为目标核心网设备，在该源核心网设备向该目标核心网设备发送该上 下文信息之后，该方法还包括：该源核心网设备接收该目标核心网设备发送的第一指示信息，该第一指示信息用于指示该源核心网设备释放该上下文信息，或指示该源核心网设备触发源接入网设备释放该上下文信息；该源核心网设备根据该第一指示信息，释放该上下文信息，或该源核心网设备向该源接入网设备转发该第一指示信息。
可选地，在本申请实施例中，该源网络设备为源PLMN网络设备，该目标网络设备为目标PLMN网络设备，该方法还包括：该源PLMN网络设备向源接入网设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源PLMN网络设备接收该源接入网设备发送的该上下文信息。
可选地，在本申请实施例中，该源网络设备为源PLMN网络设备，该目标网络设备为目标PLMN网络设备，在该源PLMN网络设备向该目标PLMN网络设备发送该上下文信息之后，该方法还包括：该源PLMN网络设备接收该目标PLMN网络设备发送的第二指示信息，该第二指示信息用于指示该源PLMN网络设备释放该上下文信息，或指示该源PLMN网络设备触发源接入网设备释放该上下文信息；该源PLMN网络设备根据该第二指示信息，释放该上下文信息，或该源PLMN网络设备向该源接入网设备转发该第二指示信息。
可选地，在本申请实施例中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，该方法还包括：该源接入网设备向源核心网设备或源PLMN网络设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；该源接入网设备接收该源核心网设备或该源PLMN网络设备发送的该上下文信息。
可选地，在本申请实施例中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，在该源接入网设备向该目标接入网设备发送该上下文信息之后，该方法还包括：该源接入网设备接收该目标接入网设备发送的第三指示信息，该第三指示信息用于指示该源接入网设备释放该上下文信息，或指示该源接入网设备触发源核心网设备或源PLMN网络设备释放该上下文信息；该源接入网设备根据该第三指示信息，释放该上下文信息，或该源接入网设备向该源核心网设备或该源PLMN网络设备转发该第三指示信息。
可选地，在本申请实施例中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
应理解，源网络设备描述的网络设备与目标网络设备的交互及相关特性、功能等与目标网络设备的相关特性、功能相应。也就是说，目标网络设备向源网络设备发送什么信息，源网络设备相应地就会接收什么信息。为了简洁，在此不再赘述。
还应理解，在本申请的各种实施例中，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。
图8示出了本申请实施例的通信方法500的示意性框图。如图8所示，该方法500包括以下部分或全部内容：
S510，在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，该终端设备触发目标网络设备获取该终端设备的上下文信息。
因此，本申请实施例的通信方法，在终端设备移动到不同的PLMN或者不同的核心网下，终端设备触发目标接入网设备获取终端设备的上下文信息，以便恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，该终端设备触发目标网络设备获取该终端设备的上下文信息，包括：该终端设备向该目标网络设备发送该上下文信息。
可选地，在本申请实施例中，在该终端设备向该目标网络设备发送该上下文信息之后，该方法还包括：该终端设备接收该目标网络设备发送的指示信息，该指示信息用于指示该终端设备释放该上下文信息；该终端设备根据该指示信息，释放该上下文信息。
可选地，在本申请实施例中，该终端设备触发目标网络设备获取该终端设备的上下文信息，包括：该终端设备向该目标网络设备发送源网络设备的信息，以便于该目标网络设备从该源网络设备处获取该上下文信息。
可选地，在本申请实施例中，该目标网络设备为目标核心网设备，该源网络设备为源核心网设备，或该目标网络设备为目标PLMN网络设备，该源网络设备为源PLMN网络设备，或该目标网络设备为目标接入网设备，该源网络设备为源接入网设备。
可选地，在本申请实施例中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
应理解，终端设备描述的终端设备与网络设备的交互及相关特性、功能等与网络设备的相关特性、功能相应。也就是说，终端设备向网络设备发送什么信息，网络设备相应地就会接收什么信息。为了简洁，在此不再赘述。
上文中详细描述了根据本申请实施例的通信方法，下面将结合图6至图11，描述根据本申请实施例的通信装置，方法实施例所描述的技术特征适用于以下装置实施例。
图9示出了本申请实施例的网络设备600的示意性框图。该网络设备为目标网络设备，如图9所示，该网络设备600包括：
获取单元610，用于在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，获取该终端设备的上下文信息；
通信单元620，用于根据该上下文信息，与该终端设备进行通信。
因此，本申请实施例的网络设备，在终端设备移动到不同的PLMN或者不同的核心网下，目标网络设备可以与终端设备不进行切换直接获取终端设备的上下文信息，从而能够恢复与终端设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，该获取单元具体用于：接收该终端设备发送的该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第一发送单元，用于向该终端设备发送第一指示信息，该第一指示信息用于指示该终端设备释放该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第一接收单元，用于接收该终端设备发送的源网络设备的信息；该获取单元具体用于：根据该源网络设备的信息，向该源网络设备发送上下文获取请求消息，该上下文获取请求消息用于请求该上下文信息，该上下文获取请求消息携带该终端设备的标识；接收该源网络设备发送的该上下文信息。
可选地，在本申请实施例中，该目标网络设备为目标核心网设备，该源网络设备为源核心网设备，该网络设备还包括：第二发送单元，用于向目标接入网设备发送该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第三发送单元，用于向该源核心网设备发送第二指示信息，该第二指示信息用于指示该源核心网设备释放该上下文信息，或指示该源核心网设备触发源接入网设备释放该上下文信息。
可选地，在本申请实施例中，该目标网络设备为目标PLMN网络设备，该源网络设备为源PLMN网络设备，该网络设备还包括：第四发送单元，用于向目标接入网设备发送该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第五发送单元，用于向该源PLMN网络设备发送第三指示信息，该第三指示信息用于指示该源PLMN网络设备释放该上下文信息，或指示该源PLMN网络设备触发源接入网设备释放该上下文信息。
可选地，在本申请实施例中，该目标网络设备为目标接入网设备，该源网络设备为源接入网设备，该网络设备还包括：第六发送单元，用于向目标核心网设备或目标PLMN网络设备发送该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第七发送单元，用于向该源接入网设备发送第四指示信息，该第四指示信息用于指示该源接入网设备释放该上下文信息，或指示该源接入网设备触发源核心网设备释放该上下文信息。
可选地，在本申请实施例中，该网络设备还包括：第八发送单元，用于向该终端设备发送第五指示信息，该第五指示信息用于指示该目标网络设备已获取到该上下文信息。
可选地，在本申请实施例中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
应理解，根据本申请实施例的网络设备600可对应于本申请方法实施例中的目标网络设备，并且网络设备600中的各个单元的上述和其它操作和/或功能分别为了实现图3方法中目标网络设备的相应流程，为了简洁，在此不再赘述。
图10示出了本申请实施例的网络设备700的示意性框图。该网络设备为源网络设备，如图10所示，该网络设备700包括：
第一接收单元710，用于在终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，接收目标网络设 备发送的第一上下文获取请求消息，该第一上下文获取请求消息用于请求获取终端设备的上下文信息，该第一上下文获取请求消息携带该终端设备的标识：
第一发送单元720，用于向该目标网络设备发送该上下文信息。
因此，本申请实施例的网络设备，在终端设备移动到不同的PLMN或者不同的核心网下，源网络设备在接收到目标网络设备发送的上下文获取请求消息后将终端设备的上下文信息发送给目标网络设备，即可恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，该源网络设备为源核心网设备或源PLMN网络设备，该目标网络设备为目标核心网设备或目标PLMN网络设备，该网络设备还包括：第二发送单元，用于向源接入网设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；第二接收单元，用于接收该源接入网设备发送的该上下文信息。
可选地，在本申请实施例中，该源网络设备为源核心网设备或源PLMN网络设备，该目标网络设备为目标核心网设备或目标PLMN网络设备，该网络设备还包括：第三接收单元，用于接收该目标核心网设备发送的第一指示信息，该第一指示信息用于指示该源核心网设备释放该上下文信息，或指示该源核心网设备触发源接入网设备释放该上下文信息，或用于接收该目标PLMN网络设备发送的第一指示信息，该第一指示信息用于指示该源PLMN网络设备释放该上下文信息；第一释放单元，用于根据该第一指示信息，释放该上下文信息，或第三发送单元，用于向该源接入网设备转发该第一指示信息。
可选地，在本申请实施例中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，该网络设备还包括：第四发送单元，用于向源核心网设备或源PLMN网络设备发送第二上下文获取请求消息，该第二上下文获取请求消息用于请求获取该上下文信息；第四接收单元，用于接收该源核心网设备或该源PLMN网络设备发送的该上下文信息。
可选地，在本申请实施例中，该源网络设备为源接入网设备，该目标网络设备为目标接入网设备，该网络设备还包括：第五接收单元，用于接收该目标接入网设备发送的第三指示信息，该第三指示信息用于指示该源接入网设备释放该上下文信息，或指示该源接入网设备触发源核心网设备或源 PLMN网络设备释放该上下文信息；第二释放单元，用于根据该第三指示信息，释放该上下文信息，或第五发送单元，用于向该源核心网设备或该源PLMN网络设备转发该第三指示信息。
可选地，在本申请实施例中，该终端设备为处于无线资源控制RRC非激活态的终端设备。
应理解，根据本申请实施例的网络设备700可对应于本申请方法实施例中的源网络设备，并且网络设备700中的各个单元的上述和其它操作和/或功能分别为了实现图4方法中目标网络设备的相应流程，为了简洁，在此不再赘述。
图11示出了本申请实施例的终端设备800的示意性框图。如图11所示，该终端设备800包括：
确定单元810，用于确定该终端设备从第一共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网；
触发单元820，用于触发目标网络设备获取该终端设备的上下文信息。
因此，本申请实施例的终端设备，在终端设备移动到不同的PLMN或者不同的核心网下，终端设备触发目标接入网设备获取终端设备的上下文信息，以便恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
可选地，在本申请实施例中，该触发单元具体用于：向该目标网络设备发送该上下文信息。
可选地，在本申请实施例中，该终端设备还包括：接收单元，用于接收该目标网络设备发送的指示信息，该指示信息用于指示该终端设备释放该上下文信息；释放单元，用于根据该指示信息，释放该上下文信息。
可选地，在本申请实施例中，该触发单元具体用于：向该目标网络设备发送源网络设备的信息，以便于该目标网络设备从该源网络设备处获取该上下文信息。
可选地，在本申请实施例中，该目标网络设备为目标核心网设备，该源网络设备为源核心网设备，或该目标网络设备为目标PLMN网络设备，该源网络设备为源PLMN网络设备，或该目标网络设备为目标接入网设备，该源网络设备为源接入网设备。
可选地，在本申请实施例中，该终端设备为处于无线资源控制RRC非 激活态的终端设备。
应理解，根据本申请实施例的终端设备800可对应于本申请方法实施例中的终端设备，并且终端设备800中的各个单元的上述和其它操作和/或功能分别为了实现图5方法中目标网络设备的相应流程，为了简洁，在此不再赘述。
如图12所示，本申请实施例还提供了一种网络设备900，该网络设备900可以是图9中的网络设备600，其能够用于执行与图3中方法300对应的网络设备的内容。该网络设备900包括：输入接口910、输出接口920、处理器930以及存储器940，该输入接口910、输出接口920、处理器930和存储器940可以通过总线系统相连。该存储器940用于存储包括程序、指令或代码。该处理器930，用于执行该存储器940中的程序、指令或代码，以控制输入接口910接收信号、控制输出接口920发送信号以及完成前述方法实施例中的操作。
因此，本申请实施例的网络设备，在终端设备移动到不同的PLMN或者不同的核心网下，可以与终端设备不进行切换直接获取终端设备的上下文信息，从而能够恢复与终端设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
应理解，在本申请实施例中，该处理器930可以是中央处理单元(Central Processing Unit，CPU)，该处理器930还可以是其他通用处理器、数字信号处理器、专用集成电路、现成可编程门阵列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。
该存储器940可以包括只读存储器和随机存取存储器，并向处理器930提供指令和数据。存储器940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940还可以存储设备类型的信息。
在实现过程中，上述方法的各内容可以通过处理器930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内容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模块组合执行完成。软件模块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940，处理器930读取存储器940中的信息，结合其 硬件完成上述方法的内容。为避免重复，这里不再详细描述。
一个具体的实施方式中，网络设备600中的第一接收单元可以由图12中的输入接口910实现，网络设备600中的第一发送单元至第八发送单元可以由图12中的输出接口920实现，网络设备600中的获取单元可以由图12中的处理器930实现。
如图13所示，本申请实施例还提供了一种网络设备1000，该网络设备1000可以是图10中的网络设备700，其能够用于执行与图7中方法400对应的网络设备的内容。该网络设备1000包括：输入接口1010、输出接口1020、处理器1030以及存储器1040，该输入接口1010、输出接口1020、处理器1030和存储器1040可以通过总线系统相连。该存储器1040用于存储包括程序、指令或代码。该处理器1030，用于执行该存储器1040中的程序、指令或代码，以控制输入接口1010接收信号、控制输出接口1020发送信号以及完成前述方法实施例中的操作。
因此，本申请实施例的网络设备，在终端设备移动到不同的PLMN或者不同的核心网下，在接收到目标网络设备发送的上下文获取请求消息后将终端设备的上下文信息发送给目标网络设备，即可恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
应理解，在本申请实施例中，该处理器1030可以是中央处理单元(Central Processing Unit，CPU)，该处理器1030还可以是其他通用处理器、数字信号处理器、专用集成电路、现成可编程门阵列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。
该存储器1040可以包括只读存储器和随机存取存储器，并向处理器1030提供指令和数据。存储器1040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1040还可以存储设备类型的信息。
在实现过程中，上述方法的各内容可以通过处理器1030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内容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模块组合执行完成。软件模块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1040，处理器1030读取存储器1040中的信息， 结合其硬件完成上述方法的内容。为避免重复，这里不再详细描述。
一个具体的实施方式中，网络设备700中的第一接收单元至第五接收单元可以由图13中的输入接口1010实现，网络设备700中的第一发送单元至第五发送单元可以由图13中的输出接口1020实现，网络设备700中的第一释放单元和第二释放单元可以由图13中的处理器1030实现。
如图14所示，本申请实施例还提供了一种终端设备2000，该终端设备2000可以是图11中的终端设备800，其能够用于执行与图8中方法500对应的终端设备的内容。该终端设备2000包括：输入接口2010、输出接口2020、处理器2030以及存储器2040，该输入接口2010、输出接口2020、处理器2030和存储器2040可以通过总线系统相连。该存储器2040用于存储包括程序、指令或代码。该处理器2030，用于执行该存储器2040中的程序、指令或代码，以控制输入接口2010接收信号、控制输出接口2020发送信号以及完成前述方法实施例中的操作。
因此，本申请实施例的终端设备，在终端设备移动到不同的PLMN或者不同的核心网下，终端设备触发目标接入网设备获取终端设备的上下文信息，以便恢复终端设备与网络设备之间的连接，以节省终端电量与网络开销，从而提高终端移动性能。
应理解，在本申请实施例中，该处理器2030可以是中央处理单元(Central Processing Unit，CPU)，该处理器2030还可以是其他通用处理器、数字信号处理器、专用集成电路、现成可编程门阵列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。
该存储器2040可以包括只读存储器和随机存取存储器，并向处理器2030提供指令和数据。存储器2040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2040还可以存储设备类型的信息。
在实现过程中，上述方法的各内容可以通过处理器2030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内容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模块组合执行完成。软件模块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2040，处理器2030读取存储器2040中的信息， 结合其硬件完成上述方法的内容。为避免重复，这里不再详细描述。
一个具体的实施方式中，终端设备800中的接收单元可以由图14中的输出接口2010实现，终端设备800中的触发单元、释放单元和确定单元可以由图14中的处理器2030实现。
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，该单元的划分，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。
该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。
该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。
以上该，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该以权利要求的保护范围为准。

Claims (50)

  1. 一种通信方法，其特征在于，包括：
    在终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，目标网络设备获取所述终端设备的上下文信息；
    所述目标网络设备根据所述上下文信息，与所述终端设备进行通信。
  2. 根据权利要求1所述的方法，其特征在于，所述目标网络设备获取所述终端设备的上下文信息，包括：
    所述目标网络设备接收所述终端设备发送的所述上下文信息。
  3. 根据权利要求2所述的方法，其特征在于，在所述目标网络设备接收所述终端设备发送的所述上下文信息之后，所述方法还包括：
    所述目标网络设备向所述终端设备发送第一指示信息，所述第一指示信息用于指示所述终端设备释放所述上下文信息。
  4. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述目标网络设备接收所述终端设备发送的源网络设备的信息；
    所述目标网络设备获取所述终端设备的上下文信息，包括：
    所述目标网络设备根据所述源网络设备的信息，向所述源网络设备发送上下文获取请求消息，所述上下文获取请求消息用于请求所述上下文信息，所述上下文获取请求消息携带所述终端设备的标识；
    所述目标网络设备接收所述源网络设备发送的所述上下文信息。
  5. 根据权利要求4所述的方法，其特征在于，所述目标网络设备为目标核心网设备，所述源网络设备为源核心网设备，所述方法还包括：
    所述目标核心网设备向目标接入网设备发送所述上下文信息。
  6. 根据权利要求5所述的方法，其特征在于，在所述目标核心网设备接收到所述源核心网设备发送的所述上下文信息之后，所述方法还包括：
    所述目标核心网设备向所述源核心网设备发送第二指示信息，所述第二指示信息用于指示所述源核心网设备释放所述上下文信息，或指示所述源核心网设备触发源接入网设备释放所述上下文信息。
  7. 根据权利要求4所述的方法，其特征在于，所述目标网络设备为目标PLMN网络设备，所述源网络设备为源PLMN网络设备，所述方法还包括：
    所述目标PLMN网络设备向目标接入网设备发送所述上下文信息。
  8. 根据权利要求7所述的方法，其特征在于，在所述目标PLMN网络设备接收到所述源PLMN网络设备发送的所述上下文信息之后，所述方法还包括：
    所述目标PLMN网络设备向所述源PLMN网络设备发送第三指示信息，所述第三指示信息用于指示所述源PLMN网络设备释放所述上下文信息，或指示所述源PLMN网络设备触发源接入网设备释放所述上下文信息。
  9. 根据权利要求4所述的方法，其特征在于，所述目标网络设备为目标接入网设备，所述源网络设备为源接入网设备，所述方法还包括：
    所述目标接入网设备向目标核心网设备或目标PLMN网络设备发送所述上下文信息。
  10. 根据权利要求9所述的方法，其特征在于，在所述目标接入网设备接收到所述源接入网设备发送的所述上下文信息之后，所述方法还包括：
    所述目标接入网设备向所述源接入网设备发送第四指示信息，所述第四指示信息用于指示所述源接入网设备释放所述上下文信息，或指示所述源接入网设备触发源核心网设备释放所述上下文信息。
  11. 根据权利要求1至10中任一项所述的方法，其特征在于，在所述目标网络设备获取所述终端设备的上下文信息之后，所述方法还包括：
    所述目标网络设备向所述终端设备发送第五指示信息，所述第五指示信息用于指示所述目标网络设备已获取到所述上下文信息。
  12. 根据权利要求1至11中任一项所述的方法，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
  13. 一种通信方法，其特征在于，包括：
    在终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，源网络设备接收目标网络设备发送的第一上下文获取请求消息，所述第一上下文获取请求消息用于请求获取终端设备的上下文信息，所述第一上下文获取请求消息携带所述终端设备的标识；
    所述源网络设备向所述目标网络设备发送所述上下文信息。
  14. 根据权利要求13所述的方法，其特征在于，所述源网络设备为源核心网设备，所述目标网络设备为目标核心网设备，所述方法还包括：
    所述源核心网设备向源接入网设备发送第二上下文获取请求消息，所述第二上下文获取请求消息用于请求获取所述上下文信息；
    所述源核心网设备接收所述源接入网设备发送的所述上下文信息。
  15. 根据权利要求13或14所述的方法，其特征在于，所述源网络设备为源核心网设备，所述目标网络设备为目标核心网设备，在所述源核心网设备向所述目标核心网设备发送所述上下文信息之后，所述方法还包括：
    所述源核心网设备接收所述目标核心网设备发送的第一指示信息，所述第一指示信息用于指示所述源核心网设备释放所述上下文信息，或指示所述源核心网设备触发源接入网设备释放所述上下文信息；
    所述源核心网设备根据所述第一指示信息，释放所述上下文信息，或
    所述源核心网设备向所述源接入网设备转发所述第一指示信息。
  16. 根据权利要求13所述的方法，其特征在于，所述源网络设备为源PLMN网络设备，所述目标网络设备为目标PLMN网络设备，所述方法还包括：
    所述源PLMN网络设备向源接入网设备发送第二上下文获取请求消息，所述第二上下文获取请求消息用于请求获取所述上下文信息；
    所述源PLMN网络设备接收所述源接入网设备发送的所述上下文信息。
  17. 根据权利要求13或16所述的方法，其特征在于，所述源网络设备为源PLMN网络设备，所述目标网络设备为目标PLMN网络设备，在所述源PLMN网络设备向所述目标PLMN网络设备发送所述上下文信息之后，所述方法还包括：
    所述源PLMN网络设备接收所述目标PLMN网络设备发送的第二指示信息，所述第二指示信息用于指示所述源PLMN网络设备释放所述上下文信息，或指示所述源PLMN网络设备触发源接入网设备释放所述上下文信息；
    所述源PLMN网络设备根据所述第二指示信息，释放所述上下文信息，或
    所述源PLMN网络设备向所述源接入网设备转发所述第二指示信息。
  18. 根据权利要求13所述的方法，其特征在于，所述源网络设备为源接入网设备，所述目标网络设备为目标接入网设备，所述方法还包括：
    所述源接入网设备向源核心网设备或源PLMN网络设备发送第二上下文获取请求消息，所述第二上下文获取请求消息用于请求获取所述上下文信 息；
    所述源接入网设备接收所述源核心网设备或所述源PLMN网络设备发送的所述上下文信息。
  19. 根据权利要求13或18所述的方法，其特征在于，所述源网络设备为源接入网设备，所述目标网络设备为目标接入网设备，在所述源接入网设备向所述目标接入网设备发送所述上下文信息之后，所述方法还包括：
    所述源接入网设备接收所述目标接入网设备发送的第三指示信息，所述第三指示信息用于指示所述源接入网设备释放所述上下文信息，或指示所述源接入网设备触发源核心网设备或源PLMN网络设备释放所述上下文信息；
    所述源接入网设备根据所述第三指示信息，释放所述上下文信息，或
    所述源接入网设备向所述源核心网设备或所述源PLMN网络设备转发所述第三指示信息。
  20. 根据权利要求13至19中任一项所述的方法，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
  21. 一种通信方法，其特征在于，包括：
    在终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，所述终端设备触发目标网络设备获取所述终端设备的上下文信息。
  22. 根据权利要求21所述的方法，其特征在于，所述终端设备触发目标网络设备获取所述终端设备的上下文信息，包括：
    所述终端设备向所述目标网络设备发送所述上下文信息。
  23. 根据权利要求22所述的方法，其特征在于，在所述终端设备向所述目标网络设备发送所述上下文信息之后，所述方法还包括：
    所述终端设备接收所述目标网络设备发送的指示信息，所述指示信息用于指示所述终端设备释放所述上下文信息；
    所述终端设备根据所述指示信息，释放所述上下文信息。
  24. 根据权利要求21所述的方法，其特征在于，所述终端设备触发目标网络设备获取所述终端设备的上下文信息，包括：
    所述终端设备向所述目标网络设备发送源网络设备的信息，以便于所述目标网络设备从所述源网络设备处获取所述上下文信息。
  25. 根据权利要求24所述的方法，其特征在于，所述目标网络设备为 目标核心网设备，所述源网络设备为源核心网设备，或所述目标网络设备为目标PLMN网络设备，所述源网络设备为源PLMN网络设备，或所述目标网络设备为目标接入网设备，所述源网络设备为源接入网设备。
  26. 根据权利要求21至25中任一项所述的方法，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
  27. 一种网络设备，其特征在于，所述网络设备为目标网络设备，所述网络设备包括：
    获取单元，用于在终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，获取所述终端设备的上下文信息；
    通信单元，用于根据所述上下文信息，与所述终端设备进行通信。
  28. 根据权利要求27所述的网络设备，其特征在于，所述获取单元具体用于：
    接收所述终端设备发送的所述上下文信息。
  29. 根据权利要求28所述的网络设备，其特征在于，所述网络设备还包括：
    第一发送单元，用于向所述终端设备发送第一指示信息，所述第一指示信息用于指示所述终端设备释放所述上下文信息。
  30. 根据权利要求27所述的网络设备，其特征在于，所述网络设备还包括：
    第一接收单元，用于接收所述终端设备发送的源网络设备的信息；
    所述获取单元具体用于：
    根据所述源网络设备的信息，向所述源网络设备发送上下文获取请求消息，所述上下文获取请求消息用于请求所述上下文信息，所述上下文获取请求消息携带所述终端设备的标识；
    接收所述源网络设备发送的所述上下文信息。
  31. 根据权利要求30所述的网络设备，其特征在于，所述目标网络设备为目标核心网设备，所述源网络设备为源核心网设备，所述网络设备还包括：
    第二发送单元，用于向目标接入网设备发送所述上下文信息。
  32. 根据权利要求31所述的网络设备，其特征在于，所述网络设备还 包括：
    第三发送单元，用于向所述源核心网设备发送第二指示信息，所述第二指示信息用于指示所述源核心网设备释放所述上下文信息，或指示所述源核心网设备触发源接入网设备释放所述上下文信息。
  33. 根据权利要求30所述的网络设备，其特征在于，所述目标网络设备为目标PLMN网络设备，所述源网络设备为源PLMN网络设备，所述网络设备还包括：
    第四发送单元，用于向目标接入网设备发送所述上下文信息。
  34. 根据权利要求33所述的网络设备，其特征在于，所述网络设备还包括：
    第五发送单元，用于向所述源PLMN网络设备发送第三指示信息，所述第三指示信息用于指示所述源PLMN网络设备释放所述上下文信息，或指示所述源PLMN网络设备触发源接入网设备释放所述上下文信息。
  35. 根据权利要求30所述的网络设备，其特征在于，所述目标网络设备为目标接入网设备，所述源网络设备为源接入网设备，所述网络设备还包括：
    第六发送单元，用于向目标核心网设备或目标PLMN网络设备发送所述上下文信息。
  36. 根据权利要求35所述的网络设备，其特征在于，所述网络设备还包括：
    第七发送单元，用于向所述源接入网设备发送第四指示信息，所述第四指示信息用于指示所述源接入网设备释放所述上下文信息，或指示所述源接入网设备触发源核心网设备释放所述上下文信息。
  37. 根据权利要求27至36中任一项所述的网络设备，其特征在于，所述网络设备还包括：
    第八发送单元，用于向所述终端设备发送第五指示信息，所述第五指示信息用于指示所述目标网络设备已获取到所述上下文信息。
  38. 根据权利要求27至37中任一项所述的网络设备，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
  39. 一种网络设备，其特征在于，所述网络设备为源网络设备，所述网络设备包括：
    第一接收单元，用于在终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网的情况下，接收目标网络设备发送的第一上下文获取请求消息，所述第一上下文获取请求消息用于请求获取终端设备的上下文信息，所述第一上下文获取请求消息携带所述终端设备的标识；
    第一发送单元，用于向所述目标网络设备发送所述上下文信息。
  40. 根据权利要求39所述的网络设备，其特征在于，所述源网络设备为源核心网设备或源PLMN网络设备，所述目标网络设备为目标核心网设备或目标PLMN网络设备，所述网络设备还包括：
    第二发送单元，用于向源接入网设备发送第二上下文获取请求消息，所述第二上下文获取请求消息用于请求获取所述上下文信息；
    第二接收单元，用于接收所述源接入网设备发送的所述上下文信息。
  41. 根据权利要求39或40所述的网络设备，其特征在于，所述源网络设备为源核心网设备或源PLMN网络设备，所述目标网络设备为目标核心网设备或目标PLMN网络设备，所述网络设备还包括：
    第三接收单元，用于接收所述目标核心网设备发送的第一指示信息，所述第一指示信息用于指示所述源核心网设备释放所述上下文信息，或指示所述源核心网设备触发源接入网设备释放所述上下文信息，或用于接收所述目标PLMN网络设备发送的第一指示信息，所述第一指示信息用于指示所述源PLMN网络设备释放所述上下文信息；
    第一释放单元，用于根据所述第一指示信息，释放所述上下文信息，或
    第三发送单元，用于向所述源接入网设备转发所述第一指示信息。
  42. 根据权利要求39所述的网络设备，其特征在于，所述源网络设备为源接入网设备，所述目标网络设备为目标接入网设备，所述网络设备还包括：
    第四发送单元，用于向源核心网设备或源PLMN网络设备发送第二上下文获取请求消息，所述第二上下文获取请求消息用于请求获取所述上下文信息；
    第四接收单元，用于接收所述源核心网设备或所述源PLMN网络设备发送的所述上下文信息。
  43. 根据权利要求39或42所述的网络设备，其特征在于，所述源网络 设备为源接入网设备，所述目标网络设备为目标接入网设备，所述网络设备还包括：
    第五接收单元，用于接收所述目标接入网设备发送的第三指示信息，所述第三指示信息用于指示所述源接入网设备释放所述上下文信息，或指示所述源接入网设备触发源核心网设备或源PLMN网络设备释放所述上下文信息；
    第二释放单元，用于根据所述第三指示信息，释放所述上下文信息，或
    第五发送单元，用于向所述源核心网设备或所述源PLMN网络设备转发所述第三指示信息。
  44. 根据权利要求39至43中任一项所述的网络设备，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
  45. 一种终端设备，其特征在于，所述终端设备包括：
    确定单元，用于确定所述终端设备从第一公共陆地移动网络PLMN移动到第二PLMN或从第一核心网移动到第二核心网；
    触发单元，用于触发目标网络设备获取所述终端设备的上下文信息。
  46. 根据权利要求45所述的终端设备，其特征在于，所述触发单元具体用于：
    向所述目标网络设备发送所述上下文信息。
  47. 根据权利要求46所述的终端设备，其特征在于，所述终端设备还包括：
    接收单元，用于接收所述目标网络设备发送的指示信息，所述指示信息用于指示所述终端设备释放所述上下文信息；
    释放单元，用于根据所述指示信息，释放所述上下文信息。
  48. 根据权利要求45所述的终端设备，其特征在于，所述触发单元具体用于：
    向所述目标网络设备发送源网络设备的信息，以便于所述目标网络设备从所述源网络设备处获取所述上下文信息。
  49. 根据权利要求48所述的终端设备，其特征在于，所述目标网络设备为目标核心网设备，所述源网络设备为源核心网设备，或所述目标网络设备为目标PLMN网络设备，所述源网络设备为源PLMN网络设备，或所述目标网络设备为目标接入网设备，所述源网络设备为源接入网设备。
  50. 根据权利要求45至49中任一项所述的终端设备，其特征在于，所述终端设备为处于无线资源控制RRC非激活态的终端设备。
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