WO2020119404A1 - 一种数据发送方法及设备 - Google Patents

一种数据发送方法及设备 Download PDF

Info

Publication number
WO2020119404A1
WO2020119404A1 PCT/CN2019/119251 CN2019119251W WO2020119404A1 WO 2020119404 A1 WO2020119404 A1 WO 2020119404A1 CN 2019119251 W CN2019119251 W CN 2019119251W WO 2020119404 A1 WO2020119404 A1 WO 2020119404A1
Authority
WO
WIPO (PCT)
Prior art keywords
entity
downlink data
communication system
mobile communication
mme
Prior art date
Application number
PCT/CN2019/119251
Other languages
English (en)
French (fr)
Inventor
邓强
Original Assignee
电信科学技术研究院有限公司
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 电信科学技术研究院有限公司 filed Critical 电信科学技术研究院有限公司
Priority to KR1020217022006A priority Critical patent/KR102505630B1/ko
Priority to EP19896235.9A priority patent/EP3897036B1/en
Priority to EP23154727.4A priority patent/EP4221360A1/en
Priority to US17/311,694 priority patent/US11405834B2/en
Priority to JP2021534129A priority patent/JP7206390B2/ja
Publication of WO2020119404A1 publication Critical patent/WO2020119404A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • 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
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This application relates to the field of wireless communication technology, and in particular, to a data transmission method and device.
  • UE User Equipment
  • 3rd Generation Mobile Communications Standardization Organization 3rd Generation Generation Partnership Project, 3GPP
  • PSM Power Saving Mode
  • eDRX Extended non-continuous Extended
  • the access stratum (AS) receiver When the UE is in the power saving mode, the access stratum (AS) receiver will be turned off, the network cannot page the UE, and the UE is in an unreachable state.
  • the core network When downlink data of the UE arrives at the network, the core network will buffer the downlink data of the UE.
  • the UE initiates the registration process or service request process again, the UE will return to the reachable state, and the core network will send the cached data to the UE.
  • the UE may switch across communication systems.
  • a UE with 4th-generation mobile communication technology (4th-Generation, 4G) and 5th-generation mobile communication technology (5th-Generation, 5G) access capabilities The UE may move between the 4G communication system and the 5G communication system. Therefore, after the UE moves across the communication system, if the downlink data of the UE is buffered in the source communication system, after the UE moves to the target communication system, how to send the buffered downlink data to the UE becomes an urgent problem to be solved.
  • the present application provides a data sending method and device to solve the problem that after the UE moves across the communication system, there is no solution for sending the downlink data buffered in the source communication system to the UE.
  • an embodiment of the present application provides a data transmission method, including:
  • the mobility management entity (Mobility Management Entity, MME) entity located in the second mobile communication system receives the downlink data cache indication sent by the session management function entity (Session Management Function, SMF) entity located in the first mobile communication system; wherein, The downlink data buffer indication is used to indicate that the downlink data of the UE is buffered in the first mobile communication system;
  • MME Mobility Management Entity
  • SMF Session Management Function
  • the MME entity initiates establishment of the user plane connection and/or control plane connection of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • an embodiment of the present application provides a data transmission method, including:
  • An SMF entity located in the first mobile communication system determines that the downlink data of the UE is buffered in the first mobile communication system
  • the SMF entity sends a downlink data cache indication to an MME entity located in the second mobile communication system, so that the MME entity initiates establishment of a user plane connection and/or control of the UE after receiving the downlink data cache indication
  • the plane connection is convenient for the user plane function entity to send the buffered downlink data to the UE through the user plane connection and/or the control plane connection.
  • an embodiment of the present application provides another data transmission method, including:
  • An SMF entity located in the first mobile communication system receives a downlink data buffer indication sent by an MME entity located in the second mobile communication system; wherein the downlink data buffer indication is used to instruct the second mobile communication system Downlink data of the UE is cached in it;
  • the SMF entity activates a protocol data unit (Protocol Data Unit, PDU) session connection corresponding to the cached downlink data of the UE, so that the user plane function entity sends the cached downlink data to the UE through the PDU session connection .
  • PDU Protocol Data Unit
  • an embodiment of the present application provides another data transmission method, including:
  • the mobility management entity (Access and Mobility Management Function, AMF) entity located in the first mobile communication system receives the downlink data buffer indication sent by the MME entity located in the second mobile communication system;
  • AMF Access and Mobility Management Function
  • the AMF entity forwards the downlink data cache indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the cached downlink data of the UE, which is convenient for the user plane
  • the functional entity sends the buffered downlink data to the UE through the PDU session connection.
  • an embodiment of the present application provides another data transmission method, including:
  • the MME entity located in the second mobile communication system determines that the serving gateway (ServingGateWay, SGW) of the second mobile communication system buffers the downlink data of the UE;
  • the MME entity sends a downlink data cache indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the cached downlink data of the UE, so that the user plane function entity can cache the Downlink data is sent to the UE through the PDU session connection.
  • an embodiment of the present application provides a first MME entity, which is located in a second mobile communication system and includes a processor and a memory;
  • the processor is used to read the program in the memory and execute:
  • an embodiment of the present application provides a first SMF entity, which is located in a first mobile communication system and includes a processor and a memory;
  • the processor is used to read the program in the memory and execute:
  • the user plane functional entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • an embodiment of the present application provides a second SMF entity, which is located in the first mobile communication system and includes a processor and a memory;
  • the processor is used to read the program in the memory and execute:
  • an embodiment of the present application provides an AMF entity, which is located in a first mobile communication system and includes a processor and a memory;
  • the processor is used to read the program in the memory and execute:
  • the downlink data is sent to the UE through the PDU session connection.
  • an embodiment of the present application provides a second MME entity, which is located in a second mobile communication system and includes a processor and a memory;
  • the processor is used to read the program in the memory and execute:
  • an embodiment of the present application provides a third type of MME entity.
  • the MME entity is located in a second mobile communication system and includes:
  • a first receiving module configured to receive a downlink data buffer indication sent by an SMF entity located in the first mobile communication system; wherein the downlink data buffer indication is used to indicate that the first mobile communication system has the buffer UE downlink data;
  • the first processing module is configured to initiate the establishment of the user plane connection and/or control plane connection of the UE, so that the user plane functional entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection UE.
  • an embodiment of the present application provides a third SMF entity.
  • the SMF entity is located in the first mobile communication system and includes:
  • a first determining module configured to determine that downlink data of the UE is buffered in the first mobile communication system
  • the first sending module is configured to send a downlink data buffer indication to the MME entity in the second mobile communication system, so that the MME entity initiates the establishment of the user plane connection of the UE after receiving the downlink data buffer indication /Or control plane connection, so that the user plane functional entity can send the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • an embodiment of the present application provides a fourth SMF entity.
  • the SMF entity is located in the first mobile communication system and includes:
  • a second receiving module configured to receive a downlink data buffer indication sent by an MME entity located in the second mobile communication system; wherein the downlink data buffer indication is used to indicate that the second mobile communication system has the buffer UE downlink data;
  • the second processing module is configured to activate the PDU session connection corresponding to the buffered downlink data of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the PDU session connection.
  • an embodiment of the present application provides another AMF entity, where the AMF entity is located in the first mobile communication system and includes:
  • a third receiving module configured to receive a downlink data buffer indication sent by an MME entity located in the second mobile communication system
  • a second sending module configured to forward the downlink data buffer indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the buffered downlink data of the UE, It is convenient for the user plane function entity to send the buffered downlink data to the UE through the PDU session connection.
  • an embodiment of the present application provides a fourth MME entity.
  • the MME entity is located in a second mobile communication system and includes:
  • a second determining module configured to determine that downlink data of the UE is cached in the SGW of the second mobile communication system
  • the third sending module is used to send a downlink data buffer indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the buffered downlink data of the UE, which is convenient for the user plane functional entity Sending the buffered downlink data to the UE through the PDU session connection.
  • an embodiment of the present application provides a computer storable medium on which a computer program is stored, which when executed by a processor implements the steps of the method described in the first aspect above, or implements the second aspect described above The steps of the method.
  • an embodiment of the present application provides another computer-storable medium on which a computer program is stored, which when executed by a processor implements the steps of the method described in the third aspect above, or the fourth embodiment described above The steps of the method described in the aspect, or the steps of the method described in the fifth aspect above.
  • the MME entity in the second mobile communication system receives the downlink data buffering instruction sent by the SMF entity in the first mobile communication system to establish the UE
  • the user plane and/or control plane connection of the user and the buffered downlink data of the UE is sent to the UE through the established user plane and/or control plane, thereby providing a method for the UE to move the first mobile after moving to the second mobile communication system
  • the downlink data buffered in the communication system is sent to the UE through the user plane and/or control plane connection established by the second mobile communication system to avoid losing the buffered downlink data of the UE, improving system reliability and further improving system performance.
  • the SMF entity in the first mobile communication system receives the downlink data buffer indication sent by the MME entity in the second mobile communication system, and then activates the buffered downlink of the UE PDU session connection corresponding to the data, the buffered downlink data of the UE is sent to the UE through the activated PDU session connection, thereby providing a method for the UE to move the downlink data buffered in the second mobile communication system after moving to the first mobile communication system
  • the PDU session connection activated in the first mobile communication system is sent to the UE to avoid losing the downlink data of the cached UE, thereby improving system reliability and further improving system performance.
  • FIG. 1 is a schematic diagram of a system architecture of an embodiment of this application.
  • FIG. 2 is a schematic structural diagram of a first data transmission system according to an embodiment of the present application.
  • FIG. 3 is a flow chart of the first type of data transmission according to an embodiment of this application.
  • FIG. 5 is a schematic structural diagram of a second data transmission system according to an embodiment of the present application.
  • FIG. 6 is a flow chart of a third data transmission according to an embodiment of this application.
  • FIG. 7 is a schematic structural diagram of a first MME entity according to an embodiment of this application.
  • FIG. 8 is a schematic structural diagram of a first SMF entity according to an embodiment of this application.
  • FIG. 9 is a schematic structural diagram of a second MME entity according to an embodiment of this application.
  • FIG. 10 is a schematic structural diagram of a second SMF entity according to an embodiment of this application.
  • FIG. 11 is a flowchart of a first data sending method according to an embodiment of this application.
  • FIG. 13 is a schematic structural diagram of a third SMF entity according to an embodiment of this application.
  • FIG. 14 is a schematic structural diagram of a first AMF entity according to an embodiment of this application.
  • FIG. 15 is a schematic structural diagram of a third MME entity according to an embodiment of this application.
  • 16 is a schematic structural diagram of a fourth SMF entity according to an embodiment of this application.
  • FIG. 17 is a schematic structural diagram of a second AMF entity according to an embodiment of this application.
  • 21 is a flowchart of a fifth data sending method according to an embodiment of this application.
  • the term “plurality” refers to two or more, and other quantifiers are similar.
  • the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly explain the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. With the evolution of the architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.
  • EPS Evolved Packet System
  • 4G system 4G system
  • 5G System 5G System
  • the Home Server (HSS) in the EPS system and the unified data management entity (Unified Data Management (UDM) in the 5GS system can be expressed as HSS+UDM101;
  • joint installation can be understood as the integration of two, that is, the HSS and UDM are set together to form a structure.
  • Policy and Charging Functions Policy and Charging Functions
  • PCF Policy Control Function
  • the packet data gateway-control plane (Packet, Data, Network, GateWay-Control, Plane, PGW-C) in the EPS system is co-located with the session management function entity (Session Management Function, SMF) in the 5GS system, which can be expressed as SMF+PGW- C 103;
  • SMF Session Management Function
  • the packet data gateway-user plane (Packet Data Network GateWay-User Plane, PGW-U) in the EPS system is co-located with the user plane function entity (User Plane Function, UPF) in the 5GS system, which can be expressed as UPF+PGW- U104, collectively referred to as user plane functional entity in the embodiments of this application;
  • UPF User Plane Function
  • the N26 interface is defined between the mobility management entity 106 (Mobility Management Entity, MME) in the EPS system and the access and mobility management entity 107 (Access and Mobility Management Function, AMF) in the 5G system, which is used in the EPS system and 5G Context information of UE is transferred between systems.
  • MME Mobility Management Entity
  • AMF Access and Mobility Management Function
  • UE 110 can communicate with the core network via the evolved Universal Terrestrial Wireless Network (Evolved Universal Terrestrial Radio Access Network, E-UTRAN) 108;
  • E-UTRAN evolved Universal Terrestrial Radio Access Network
  • UE 110 can communicate with the core network via the Next Generation Radio Access Network (NG-RAN).
  • NG-RAN Next Generation Radio Access Network
  • UE 110 may refer to an access terminal, 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.
  • Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital processing (Personal Digital Assistant (PDA), wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, Internet of Things (IOT) devices, etc.
  • SIP Session Initiation Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • IOT Internet of Things
  • system architecture is only an illustration of the system architecture applicable to the embodiment of the present application.
  • the system architecture applicable to the embodiment of the present application can add other entities or reduce some entities compared to the system architecture shown in FIG. 1.
  • the embodiment of the present application is applied to a scenario where 5GS and EPS are interconnected.
  • the UE has both 4G and 5G access capabilities, and the UE can move between the EPS system and the 5G system.
  • the UE moves across systems in the idle state; specifically, the UE is in the idle state in the source mobile communication system, and the source mobile communication system has the buffered downlink data of the UE, and moves in the UE After reaching the target communication system, the downlink data of the UE buffered in the source communication system is sent to the UE through the target communication system.
  • the UE moves from the first mobile communication system to the second mobile communication system, and the downlink data of the UE is buffered in the first mobile communication system;
  • the UE moves from the second mobile communication system to the first mobile communication system, and the downlink data of the UE is buffered in the second mobile communication system.
  • first mobile communication system is an EPS system and the second mobile communication system is a 5GS system;
  • the downlink data of the UE is cached in the serving gateway (Serving GatewayWay, SGW); in the 5GS system, the downlink data of the UE is cached in the user plane function entity or SMF entity.
  • SGW Serving GatewayWay
  • SMF User Plane Function
  • the UE moves from the first mobile communication system to the second mobile communication system.
  • the first mobile communication system is an EPS system
  • the second mobile communication system is a 5GS system.
  • the data sending system includes: an MME entity 20, an SMF entity 21, and an AMF entity 22;
  • the SMF entity 21 is located in the first mobile communication system
  • the MME entity 20 is located in the second mobile communication system
  • the AMF entity 22 is located in the first mobile communication system
  • the SMF entity can be used to perform some functions of the MME entity in the first mobile communication system, and is mainly responsible for establishing a session and managing the session for the UE, and can select a suitable user plane functional entity for the UE according to the location information of the UE;
  • the main functions of the AMF entity include the termination point of the wireless access network control plane, the termination point of non-access signaling, mobility management, legal interception, access authorization or authentication, etc.
  • the MME entity 20 is configured to receive a downlink data buffer indication sent by an SMF entity; wherein the downlink data buffer indication is used to indicate that the first mobile communication system buffers the downlink data of the UE; and initiate the establishment of the UE A user plane connection and/or a control plane connection, so that the user plane functional entity sends the buffered downlink data to the UE through the user plane connection and/or the control plane connection.
  • the SMF entity 21 is used to determine that the downlink data of the UE is cached in the first mobile communication system; send a downlink data cache indication to the MME entity, so that the MME entity initiates establishment of the institute after receiving the downlink data cache indication
  • the user plane connection and/or control plane connection of the UE facilitates the user plane function entity to send the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • the AMF entity 22 is configured to receive the downlink data buffer indication sent by the SMF entity, and send the downlink data buffer indication to the MME entity.
  • the N26 interface is defined between the AMF entity and the MME entity, when the SMF entity needs to send the downlink data buffer indication to the MME entity, it needs to be forwarded through the AMF entity.
  • the UE Since the UE moves across systems in an idle state in the embodiment of the present application, the UE is in an unreachable state in the first mobile communication system, and the AMF entity records the state of the UE as unreachable.
  • the downlink data of the UE cached in the first mobile communication system includes but is not limited to:
  • the downlink data of the UE buffered in the user plane function entity and the downlink data of the UE buffered in the SMF entity are combined.
  • the SMF entity determines that the downlink data of the UE is buffered in the first mobile communication system, the following manner may be adopted:
  • the SMF entity determines that it has buffered the downlink data of the UE
  • the SMF entity determines that the user plane functional entity buffers the downlink data of the UE.
  • the SMF entity determines that the downlink data of the UE is cached in the first mobile communication system, and before sending the downlink data cache indication to the MME entity, the SMF entity also needs to determine that the current UE is in a reachable state;
  • An optional manner is that the AMF entity notifies the SMF entity that the UE is in a reachable state in the second mobile communication system.
  • the UE sends a first request message to the MME entity; optionally, the first request message is Tracking Area Update (TAU) news.
  • TAU Tracking Area Update
  • the MME entity After receiving the first request message sent by the UE, the MME entity sends a second request message for requesting the context information of the UE to the AMF entity; optionally, the second request message is a context request message for requesting the UE Context
  • the MME entity sends a second request message to the AMF entity through the N26 interface.
  • the AMF entity After receiving the second request message, the AMF entity determines that the UE is in a reachable state after moving to the second mobile communication system, and notifies the SMF entity;
  • the AMF entity notifies the SMF entity that the UE is reachable in the second mobile communication system in the following manner:
  • the AMF entity sends a third request message to the SMF entity
  • the SMF entity After receiving the third request message, the SMF entity determines that the UE is in a reachable state after moving to the second mobile communication system.
  • the third request message is used to request session management context information of the UE.
  • the SMF entity When the downlink data of the UE is buffered in the first mobile communication system, the SMF entity sends the downlink data buffer indication after determining that the UE is in a reachable state;
  • the SMF entity forwards the cached downlink data of the UE to the user plane functional entity after determining that the UE is reachable in the second mobile communication system.
  • An optional way is that after receiving the third request message, the SMF entity determines that the UE is in a reachable state in the second mobile communication system, and then sends a downlink data buffer indication and the session management context information of the UE to the AMF entity;
  • the AMF entity returns the downlink data buffer indication and the context information of the UE to the MME entity.
  • the MME entity After receiving the downlink data buffer indication, the MME entity determines to establish the user plane connection and/or control plane connection according to the context information of the UE;
  • the MME entity determines the type of connection establishment according to the context information of the UE;
  • the MME entity can determine the established connection type according to the packet data network (Packet Data NetWorks, PDN) connection type in the context information of the UE; for example, when the PDN connection type is Control Plane only, determine to establish the control plane connection;
  • PDN Packet Data NetWorks
  • the MME entity determines the connection type according to the previous negotiation result with the UE. Specifically, the UE and the MME entity negotiate the connection type during the attach and TAU process.
  • the user plane connection in the embodiment of the present application refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to the downlink data sent through the SGW To the MME entity, and then the MME entity sends the connection to the UE via a NAS message.
  • the user plane functional entity After establishing the user plane connection and/or control plane connection of the UE, the user plane functional entity sends the buffered downlink data to the UE through the established user plane connection and/or control plane connection.
  • the EPS system and the user plane functional entity in the 5GS system are co-located.
  • the user plane functional entity may be called PGW-G, which may be used in the 5GS system. Called the UPF entity. Therefore, when the user plane functional entity of the first mobile communication system caches the downlink data of the UE, after the UE moves to the second mobile communication system, the user plane functional entity can transfer the cached downlink data of the UE through the second mobile The user plane connection and/or control plane connection of the UE established in the communication system is delivered to the UE.
  • the UE moves from the 5GS system to the EPS system, and the user plane functional entity of the 5GS system buffers the downlink data of the UE.
  • FIG. 3 a data sending flowchart in an embodiment of the present application.
  • Step 301 The UE sends a TAU request message to the MME entity
  • the UE sends a TAU request message to the MME entity through a base station (evolved Node B, eNB).
  • a base station evolved Node B, eNB
  • Step 302 The MME entity sends a context request message to the AMF entity;
  • the MME entity sends a context request message to the AMF entity through the N26 interface.
  • Step 303 The AMF entity determines that the UE is reachable in the EPS system.
  • Step 304 The AMF entity sends a context request message to the SMF entity, and indicates that the UE is reachable in the EPS system;
  • the context request message is used to request session management context information.
  • Step 305 The SMF entity determines that the UE is reachable in the EPS system.
  • Step 306 The SMF entity returns a downlink data cache indication and the session management context information of the UE to the AMF entity.
  • Step 307 The AMF entity sends the context information of the UE to the MME entity and forwards the downlink data buffer indication returned by the SMF entity.
  • Step 308 The MME entity returns a confirmation message to the AMF entity.
  • Step 309 The MME entity determines to establish the user plane connection and/or control panel connection of the UE according to the context information of the UE;
  • the user plane connection of the UE refers to a connection in which downlink data is sent to the base station via the SGW, and then the base station sends the data to the UE via the data radio bearer;
  • the MME entity requests to restore the S5 bearer between the SGW and the PGW, and requests the eNB to restore the radio bearer and the S1 bearer;
  • the control plane connection of the UE refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message;
  • the MME entity establishes the S11 bearer with the SGW.
  • Step 310 The MME entity returns a TAU acceptance message to the UE;
  • the MME entity returns a TAU acceptance message to the UE through the base station (eNB).
  • Step 311 The user plane functional entity sends the buffered downlink data to the UE through the established user plane connection and/or control plane connection.
  • the UE moves from the 5GS system to the EPS system, and the downlink data of the UE is cached in the SMF entity of the 5GS system.
  • FIG. 4 a flow chart of data transmission in an embodiment of the present application.
  • Step 401 The UE sends a TAU request message to the MME entity
  • the UE sends a TAU request message to the MME entity through the base station (eNB).
  • eNB base station
  • Step 402 The MME entity sends a context request message to the AMF entity;
  • the MME entity sends a context request message to the AMF entity through the N26 interface.
  • Step 403 The AMF entity determines that the UE is reachable in the EPS system.
  • Step 404 the AMF entity sends a context request message to the SMF entity, and indicates that the UE is reachable in the EPS system;
  • the context request message is used to request session management context information.
  • Step 405 The SMF entity determines that the UE is reachable in the EPS system.
  • Step 406 The SMF entity forwards the cached downlink data of the UE to the user plane function entity.
  • Step 407 The SMF entity returns the downlink data cache indication and the session management context information of the UE to the AMF entity.
  • Step 408 The AMF entity sends the context information of the UE to the MME entity and forwards the downlink data buffer indication returned by the SMF entity.
  • Step 409 The MME entity returns a confirmation message to the AMF entity.
  • Step 410 The MME entity determines to establish the user plane connection and/or control panel connection of the UE according to the context information of the UE;
  • the user plane connection of the UE refers to a connection in which downlink data is sent to the base station via the SGW, and then the base station sends the data to the UE via the data radio bearer;
  • the MME entity requests to restore the S5 bearer between the SGW and the PGW, and requests the eNB to restore the radio bearer and the S1 bearer;
  • the control plane connection of the UE refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message;
  • the MME entity establishes the S11 bearer with the SGW.
  • Step 411 The MME entity returns a TAU acceptance message to the UE;
  • the MME entity returns a TAU acceptance message to the UE through the base station (eNB).
  • Step 412 The user plane functional entity sends the buffered downlink data to the UE through the established user plane connection and/or control plane connection.
  • the UE moves from the second mobile communication system to the first mobile communication system.
  • the first mobile communication system is an EPS system
  • the second mobile communication system is a 5GS system.
  • the data transmission system includes: an SMF entity 50, an AMF entity 51, and an MME entity 52;
  • the SMF entity 50 is located in the first mobile communication system, the AMF entity 51 is located in the first mobile communication system, and the MME entity 52 is located in the second mobile communication system;
  • the SMF entity can be used to perform some functions of the MME entity in the first mobile communication system, and is mainly responsible for establishing a session and managing the session for the UE, and can select a suitable user plane functional entity for the UE according to the location information of the UE;
  • the main functions of the AMF entity include the termination point of the wireless access network control plane, the termination point of non-access signaling, mobility management, legal interception, access authorization or authentication, etc.
  • the SMF entity 50 is used to receive a downlink data buffer indication sent by the MME entity; wherein the downlink data buffer indication is used to indicate that the downlink data of the UE is buffered in the second mobile communication system; activate the buffer of the UE PDU session connection corresponding to the downlink data of the user, so that the user plane function entity sends the buffered downlink data to the UE through the PDU session connection.
  • the AMF entity 51 is used to receive the downlink data cache indication sent by the MME entity; forward the downlink data cache indication to the SMF entity, so that the SMF entity activates the PDU session connection corresponding to the cached downlink data of the UE, which is convenient
  • the user plane function entity sends the buffered downlink data to the UE through the PDU session connection.
  • the MME entity 52 is used to determine that the downlink data of the UE is cached in the SGW of the second mobile communication system; send a downlink data buffer indication to the SMF entity, so that the SMF entity activates the corresponding downlink data of the UE.
  • the PDU session connection is convenient for the user plane function entity to send the buffered downlink data to the UE through the PDU session connection.
  • the MME entity when the MME entity sends the downlink data cache indication to the SMF entity, the MME entity sends the downlink data cache indication to the AMF entity, and forwards the downlink data cache indication to the SMF entity through the AMF entity.
  • the N26 interface is defined between the AMF entity and the MME entity, when the SMF entity 50 needs to send a downlink data buffer indication to the MME entity, it needs to be forwarded through the AMF entity.
  • the UE Since the UE moves across systems in an idle state in the embodiment of the present application, the UE is in an unreachable state in the second mobile communication system.
  • the downlink data cached by the UE in the second mobile communication system is cached in the SGW, and after the MME entity determines that the UE is reachable in the first mobile communication system, the MME entity requests the SGW to cache the The downlink data of the UE is forwarded to the user plane functional entity;
  • the SGW forwards the buffered downlink data of the UE to the user plane functional entity through the S5 interface.
  • the MME entity determines that the UE is reachable in the first mobile communication system according to the following manner:
  • the AMF entity receives the fourth request message sent by the UE;
  • the fourth request message is sent after the UE moves from the second mobile communication system to the first mobile communication system; optionally, the fourth request message is a registration request message;
  • the AMF entity sends a fifth request message for requesting the UE context information to the MME entity;
  • the fifth request message is a context request message
  • the MME entity After receiving the fifth request message, the MME entity determines that the UE is reachable in the first mobile communication system.
  • the MME entity After the MME entity determines that the UE is reachable in the first mobile communication system and determines that the downlink data of the UE is cached in the SGW of the second mobile communication system, the MME entity sends a downlink data buffer indication to the AMF entity;
  • the MME entity sends the EPS bearer identifier corresponding to the buffered downlink data of the UE to the AMF entity.
  • the MME entity sends the downlink data buffer indication and the EPS bearer identifier corresponding to the buffered downlink data to the AMF entity through a command;
  • the MME entity sends the downlink data cache indication and the EPS bearer ID corresponding to the cached downlink data to the AMF entity through different commands; and the MME entity sends the downlink data cache indication and the EPS bearer ID corresponding to the cached downlink data to the AMF entity
  • the order is not limited.
  • the AMF entity After receiving the EPS bearer identifier corresponding to the buffered downlink data of the UE sent by the MME entity, the AMF entity maps the EPS bearer identifier to the PDU session identifier;
  • the AMF entity determines the SMF entity associated with the PDU session according to the PDU session identifier, and sends the PDU session identifier to the determined SMF entity;
  • the SMF entity determines the PDU session connection that needs to be activated according to the PDU session identifier sent by the AMF entity.
  • the AMF entity forwards the downlink data buffer indication sent by the MME entity to the SMF entity.
  • the AMF entity can send the PDU session identifier and the downlink data cache indication to the SMF entity through one signaling, or the AMF entity can send the PDU session identifier and the downlink data cache indication to the SMF entity through different signaling;
  • An optional manner is that the AMF entity sends a context update request message to the SMF entity, where the context update request message carries the downlink data cache indication and the PDU session identifier.
  • the SMF entity determines the PDU session connection to be activated according to the PDU session identifier sent by the AMF entity, the PDU session connection corresponding to the PDU session identifier is activated;
  • the user plane function entity After the SMF entity activates the PDU session connection corresponding to the PDU session identifier, the user plane function entity sends the buffered downlink data to the UE through the activated PDU session connection.
  • the EPS system and the user plane functional entity in the 5GS system are co-located.
  • the user plane functional entity may be called PGW-G, which may be used in the 5GS system. Called the UPF entity. Therefore, when the user plane functional entity of the second mobile communication system buffers the downlink data of the UE, after the UE moves to the first mobile communication system, the user plane functional entity can transfer the cached downlink data of the UE through the first mobile The PDU session connection of the UE established in the communication system is delivered to the UE.
  • the UE moves from the EPS system to the 5GS system, and the downlink data of the UE is buffered in the SGW of the EPS system.
  • FIG. 6 a flow chart of data transmission in an embodiment of the present application.
  • Step 601 The UE sends a registration request message to the AMF entity
  • the UE sends a registration request message to the AMF entity through the NG-RAN.
  • Step 602 The AMF entity sends a context request message to the MME entity;
  • the AMF entity sends a context request message to the MME entity through the N26 interface.
  • Step 603 The MME entity determines that the UE is reachable in the 5GS system.
  • Step 604 The MME entity requests the SGW to forward the cached downlink data of the UE to the user plane functional entity.
  • Step 605 The SGW forwards the cached downlink data of the UE to the user plane functional entity
  • the SGW forwards the buffered downlink data of the UE to the user plane functional entity through the S5 interface.
  • Step 606 The MME entity sends a downlink data buffer indication to the AMF entity, and the MME entity sends the EPS bearer identifier corresponding to the buffered downlink data to the AMF entity;
  • the MME entity sends the downlink data buffer indication and the EPS bearer identifier corresponding to the buffered downlink data to the AMF entity through the response message.
  • Step 607 The AMF entity maps the EPS bearer ID to the PDU session ID.
  • Step 608 The AMF entity sends a context update request message to the SMF entity;
  • the context update request message includes a downlink data cache indication and a PDU session identifier.
  • Step 609 After receiving the downlink data buffer indication, the SMF entity activates the corresponding PDU session connection according to the PDU session identifier.
  • Step 610 The AMF entity returns a registration acceptance message to the UE.
  • Step 611 The user plane function entity sends the buffered downlink data of the UE to the UE through the activated PDU session connection.
  • the MME entity is located in a second mobile communication system and includes a processor 700, a memory 701, a transceiver 702, and a bus interface.
  • the processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 when performing operations.
  • the transceiver 702 is used to receive and transmit data under the control of the processor 700.
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 700 and various circuits of the memory represented by the memory 701 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article.
  • the bus interface provides an interface.
  • the processor 700 is responsible for managing the bus architecture and general processing, and the memory 701 may store data used by the processor 700 when performing operations.
  • the process disclosed in the embodiments of the present application may be applied to the processor 700 or implemented by the processor 700.
  • each step of the signal processing flow may be completed by an integrated logic circuit of hardware in the processor 700 or instructions in the form of software.
  • the processor 700 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and registers.
  • the storage medium is located in the memory 701, and the processor 700 reads the information in the memory 701 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 700 is configured to read the program in the memory 701 and execute:
  • processor 700 is specifically used to:
  • processor 700 is also used to:
  • the first request message Before receiving the downlink data buffer indication sent by the SMF entity in the first mobile communication system, receiving the first request message sent by the UE; wherein the first request message is the UE from the first mobile communication system Sent after moving to the second mobile communication system;
  • the first request message is a TAU request message.
  • the downlink data of the UE is cached in the user plane functional entity of the first mobile communication system
  • the downlink data of the UE is buffered in the SMF entity of the first mobile communication system.
  • processor 700 is specifically used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • the SMF entity in the embodiment of the present application.
  • the SMF entity is located in the first mobile communication system and includes a processor 800, a memory 801, a transceiver 802, and a bus interface.
  • the processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 when performing operations.
  • the transceiver 802 is used to receive and transmit data under the control of the processor 800.
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 800 and various circuits of the memory represented by the memory 801 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article.
  • the bus interface provides an interface.
  • the processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 when performing operations.
  • the process disclosed in the embodiments of the present application may be applied to the processor 800 or implemented by the processor 800.
  • each step of the signal processing flow may be completed by an integrated logic circuit of hardware in the processor 800 or instructions in the form of software.
  • the processor 800 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and registers.
  • the storage medium is located in the memory 801.
  • the processor 800 reads the information in the memory 801 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 800 is configured to read the program in the memory 801 and execute:
  • the user plane functional entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • processor 800 is specifically used to:
  • processor 800 is specifically used to:
  • processor 800 is also used to:
  • the third request message is sent after the AMF entity receives the second request message sent by the MME entity to request the context information of the UE, and determines that the UE is in a reachable state;
  • processor 800 is also used to:
  • the cached downlink data of the UE is forwarded to the User plane functional entity.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • a second MME entity As shown in FIG. 9, a second MME entity according to an embodiment of the present application.
  • the MME entity is located in a second mobile communication system and includes:
  • the first receiving module 901 is configured to receive a downlink data buffer indication sent by an SMF entity located in the first mobile communication system; wherein the downlink data buffer indication is used to indicate that there is a buffer in the first mobile communication system Describe the downlink data of the UE;
  • the first processing module 902 is used to initiate the establishment of the user plane connection and/or control plane connection of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • UE Say UE.
  • the first receiving module 901 is specifically used to:
  • the first receiving module 901 is also used to:
  • the first request message Before receiving the downlink data buffer indication sent by the SMF entity in the first mobile communication system, receiving the first request message sent by the UE; wherein the first request message is the UE from the first mobile communication system Sent after moving to the second mobile communication system;
  • the first request message is a TAU request message.
  • the downlink data of the UE is cached in the user plane functional entity of the first mobile communication system
  • the downlink data of the UE is buffered in the SMF entity of the first mobile communication system.
  • the first processing module 902 is specifically used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • a second SMF entity As shown in FIG. 10, a second SMF entity according to an embodiment of the present application.
  • the SMF entity is located in the first mobile communication system and includes:
  • the first determining module 1001 is configured to determine that the downlink data of the UE is cached in the first mobile communication system
  • the first sending module 1002 is configured to send a downlink data buffer indication to an MME entity located in the second mobile communication system, so that the MME entity initiates establishment of a user plane connection of the UE after receiving the downlink data buffer indication And/or control plane connection, so that the user plane functional entity can send the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • the first sending module 1002 is specifically used to:
  • the first determining module 1001 is specifically used to:
  • the first sending module 1002 is also used to:
  • the third request message is sent after the AMF entity receives the second request message sent by the MME entity to request the context information of the UE, and determines that the UE is in a reachable state;
  • the first determining module 1001 is also used to:
  • the cached downlink data of the UE is forwarded to the User plane functional entity.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • the embodiment of the present application provides a data transmission method when a UE moves from a first mobile communication system to a second mobile communication system, including:
  • Step 1101 The MME entity located in the second mobile communication system receives the downlink data buffer indication sent by the SMF entity located in the first mobile communication system; wherein the downlink data buffer indication is used to indicate the first mobile communication system Cache the downlink data of the UE;
  • Step 1102 The MME entity initiates the establishment of the user plane connection and/or control plane connection of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the user plane connection and/or control plane connection. UE.
  • the MME entity receiving the downlink data buffer indication sent by the SMF entity located in the first mobile communication system includes:
  • the MME entity receives a downlink data buffer indication sent by the SMF entity through the AMF entity in the first mobile communication system.
  • the method before the MME entity receives the downlink data buffer indication sent by the SMF entity located in the first mobile communication system, the method further includes:
  • the MME entity receives a first request message sent by the UE; wherein the first request message is sent after the UE moves from the first mobile communication system to the second mobile communication system;
  • the MME entity sends a second request message for requesting the context information of the UE to the AMF entity in the first mobile communication system, so that the AMF entity determines the second request message after receiving the second request message After moving to the second mobile communication system, the UE is in a reachable state, and notifies the SMF entity, so that the SMF entity sends the downlink data buffer indication after determining that the UE is in the reachable state.
  • the first request message is a TAU request message.
  • the downlink data of the UE is cached in the user plane functional entity of the first mobile communication system
  • the downlink data of the UE is buffered in the SMF entity of the first mobile communication system.
  • the MME entity initiates establishment of the user plane connection and/or control plane connection of the UE, including:
  • the MME entity determines to establish a user plane connection and/or a control plane connection according to the context information of the UE.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • the embodiment of the present application provides another data transmission method when the UE moves from the first mobile communication system to the second mobile communication system, including:
  • Step 1201 The SMF entity located in the first mobile communication system determines that the downlink data of the UE is cached in the first mobile communication system;
  • Step 1202 The SMF entity sends a downlink data cache indication to the MME entity located in the second mobile communication system, so that the MME entity initiates the establishment of the user plane connection of the UE after receiving the downlink data cache indication and /Or control plane connection, so that the user plane functional entity can send the buffered downlink data to the UE through the user plane connection and/or control plane connection.
  • the SMF entity sending the downlink data buffer indication to the MME entity located in the second mobile communication system includes:
  • the SMF entity sends the downlink data buffer indication to the AMF entity in the first mobile communication system, and sends the downlink data buffer indication to the MME entity through the AMF entity.
  • the SMF entity determining that the downlink data of the UE is cached in the first mobile communication system includes:
  • the SMF entity determines that it has buffered the downlink data of the UE
  • the SMF entity determines that the user plane functional entity buffers the downlink data of the UE.
  • the method further includes:
  • the SMF entity receives a third request message sent by the AMF entity to request session management context information of the UE; wherein the third request message is used by the AMF entity to receive the MME entity Sent after the second request message requesting the UE context information to determine that the UE is in a reachable state;
  • the SMF entity determines that the UE is in a reachable state after moving to the second mobile communication system.
  • the method further includes:
  • the SMF entity forwards the buffered downlink data of the UE to the user plane function entity.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the user plane connection refers to a connection in which downlink data is sent to a base station via the SGW, and then the base station sends the data to the UE via a data radio bearer;
  • the control plane connection refers to a connection in which downlink data is sent to the MME entity via the SGW, and then the MME entity sends the data to the UE via a NAS message.
  • An embodiment of the present application provides a computer-storable medium on which a computer program is stored, and when the program is executed by a processor, the steps of the data transmission method after the UE moves from the first mobile communication system to the second mobile communication system are implemented.
  • the SMF entity in the embodiment of the present application.
  • the SMF entity is located in the first mobile communication system and includes a processor 1300, a memory 1301, a transceiver 1302, and a bus interface.
  • the processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1301 may store data used by the processor 1300 in performing operations.
  • the transceiver 1302 is used to receive and transmit data under the control of the processor 1300.
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1300 and various circuits of the memory represented by the memory 1301 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article.
  • the bus interface provides an interface.
  • the processor 1300 is responsible for managing the bus architecture and general processing, and the memory 1301 may store data used by the processor 1300 in performing operations.
  • the process disclosed in the embodiments of the present application may be applied to the processor 1300 or implemented by the processor 1300.
  • each step of the signal processing flow may be completed by an integrated logic circuit of hardware in the processor 1300 or an instruction in the form of software.
  • the processor 1300 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and registers.
  • the storage medium is located in the memory 1301, and the processor 1300 reads the information in the memory 1301 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 1300 is configured to read the program in the memory 1301 and execute:
  • processor 1300 is specifically used to:
  • processor 1300 is specifically used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the AMF entity in the embodiment of the present application.
  • the AMF entity is located in the first mobile communication system and includes a processor 1400, a memory 1401, a transceiver 1402, and a bus interface.
  • the processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1401 may store data used by the processor 1400 in performing operations.
  • the transceiver 1402 is used to receive and transmit data under the control of the processor 1400.
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1400 and various circuits of the memory represented by the memory 1401 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article.
  • the bus interface provides an interface.
  • the processor 1400 is responsible for managing the bus architecture and general processing, and the memory 1401 may store data used by the processor 1400 in performing operations.
  • the process disclosed in the embodiments of the present application may be applied to the processor 1400 or implemented by the processor 1400.
  • each step of the signal processing flow may be completed by an integrated logic circuit of hardware in the processor 1400 or instructions in the form of software.
  • the processor 1400 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, and registers.
  • the storage medium is located in the memory 1401.
  • the processor 1400 reads the information in the memory 1401 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 1400 is configured to read the program in the memory 1401 and execute:
  • the downlink data is sent to the UE through the PDU session connection.
  • processor 1400 is also used to:
  • receiving a fourth request message sent by the UE Before receiving the downlink data buffer indication sent by the MME entity located in the second mobile communication system, receiving a fourth request message sent by the UE; wherein the fourth request message is the UE from the second mobile communication system Sent after moving to the first mobile communication system;
  • processor 1400 is also used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the MME entity is located in the second mobile communication system and includes: a processor 1500, a memory 1501, a transceiver 1502, and a bus interface.
  • the processor 1500 is responsible for managing the bus architecture and general processing, and the memory 1501 may store data used by the processor 1500 in performing operations.
  • the transceiver 1502 is used to receive and transmit data under the control of the processor 1500.
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 1500 and various circuits of the memory represented by the memory 1501 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, etc., which are well known in the art, and therefore, they will not be further described in this article.
  • the bus interface provides an interface.
  • the processor 1500 is responsible for managing the bus architecture and general processing, and the memory 1501 may store data used by the processor 1500 in performing operations.
  • the process disclosed in the embodiments of the present application may be applied to the processor 1500 or implemented by the processor 1500.
  • each step of the signal processing flow may be completed by an integrated logic circuit of hardware in the processor 1500 or an instruction in the form of software.
  • the processor 1500 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the embodiments of the present application The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, and a register.
  • the storage medium is located in the memory 1501.
  • the processor 1500 reads the information in the memory 1501 and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 1500 is configured to read the program in the memory 1501 and execute:
  • processor 1500 is specifically used to:
  • processor 1500 is also used to:
  • processor 1500 is also used to:
  • the SGW After determining that the UE is in a reachable state after moving to the first mobile communication system, request the SGW to forward the buffered downlink data of the UE to the user plane function entity.
  • processor 1500 is also used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the fourth SMF entity in the embodiment of the present application where the SMF entity is located in the first mobile communication system, includes:
  • the second receiving module 1601 is configured to receive a downlink data buffer indication sent by an MME entity located in the second mobile communication system; wherein the downlink data buffer indication is used to indicate that there is a buffer in the second mobile communication system Describe the downlink data of the UE;
  • the second processing module 1602 is configured to activate a PDU session connection corresponding to the buffered downlink data of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the PDU session connection.
  • the second receiving module 1601 is specifically used to:
  • the second processing module 1602 is specifically used to:
  • the PDU session identifier is determined by the AMF entity according to the received EPS bearer identifier corresponding to the buffered downlink data of the UE .
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the second AMF entity in the embodiment of the present application where the AMF entity is located in the first mobile communication system, includes:
  • the third receiving module 1701 is configured to receive a downlink data buffer indication sent by an MME entity located in the second mobile communication system;
  • the second sending module 1702 is configured to forward the downlink data buffer indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the buffered downlink data of the UE To facilitate the user plane function entity to send the buffered downlink data to the UE through the PDU session connection.
  • the third receiving module 1701 is also used to:
  • receiving a fourth request message sent by the UE Before receiving the downlink data buffer indication sent by the MME entity located in the second mobile communication system, receiving a fourth request message sent by the UE; wherein the fourth request message is the UE from the second mobile communication system Sent after moving to the first mobile communication system;
  • the third receiving module 1701 is also used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • a fourth MME entity As shown in FIG. 18, a fourth MME entity according to an embodiment of the present application.
  • the MME entity is located in a second mobile communication system and includes:
  • a second determination module 1801 configured to determine that the downlink data of the UE is cached in the SGW of the second mobile communication system
  • the third sending module 1802 is configured to send a downlink data buffer indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the buffered downlink data of the UE, so as to facilitate user plane functions
  • the entity sends the buffered downlink data to the UE through the PDU session connection.
  • the third sending module 1802 is specifically used to:
  • the third sending module 1802 is also used to:
  • the third sending module 1802 is also used to:
  • the SGW After determining that the UE is in a reachable state after moving to the first mobile communication system, request the SGW to forward the buffered downlink data of the UE to the user plane function entity.
  • the third sending module 1802 is also used to:
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the embodiment of the present application provides a data transmission method after the UE moves from the second mobile communication system to the first mobile communication system, including:
  • Step 1901 An SMF entity located in a first mobile communication system receives a downlink data buffer indication sent by an MME entity located in a second mobile communication system; wherein the downlink data buffer indication is used to indicate the second mobile communication system Cache the downlink data of the UE;
  • Step 1902 The SMF entity activates a PDU session connection corresponding to the buffered downlink data of the UE, so that the user plane function entity sends the buffered downlink data to the UE through the PDU session connection.
  • the SMF entity receiving the downlink data buffer indication sent by the MME entity located in the second mobile communication system includes:
  • the SMF entity receives a downlink data buffer indication sent by the MME entity through the AMF entity in the first mobile communication system.
  • the SMF entity activating the PDU session connection corresponding to the buffered downlink data of the UE includes:
  • the SMF entity determines the PDU session connection that needs to be activated according to the PDU session identifier sent by the AMF entity; wherein, the PDU session identifier is an EPS corresponding to the received downlink data buffered by the UE according to the AMF entity
  • the bearer identification is determined.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the embodiment of the present application provides another data transmission method after the UE moves from the second mobile communication system to the first mobile communication system, including:
  • Step 2001 The AMF entity located in the first mobile communication system receives the downlink data buffer indication sent by the MME entity located in the second mobile communication system;
  • Step 2002 The AMF entity forwards the downlink data cache indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the cached downlink data of the UE, It is convenient for the user plane function entity to send the buffered downlink data to the UE through the PDU session connection.
  • the method before the AMF entity receives the downlink data buffer indication sent by the MME entity in the second mobile communication system, the method further includes:
  • the AMF entity receives a fourth request message sent by the UE; wherein the fourth request message is sent after the UE moves from the second mobile communication system to the first mobile communication system;
  • the AMF entity sends a fifth request message for requesting the UE context information to the MME entity, so that the MME entity determines that the UE moves to the first mobile communication system after receiving the fifth request message Is in a reachable state, and sends the downlink data buffer indication after determining that the UE is in a reachable state.
  • the method further includes:
  • the AMF entity receives the EPS bearer identifier corresponding to the buffered downlink data of the UE sent by the MME entity;
  • the AMF entity maps the EPS bearer identifier to a PDU session identifier
  • the AMF entity sends the PDU session identifier to the SMF entity, so that the SMF entity determines the PDU session connection that needs to be activated according to the PDU session identifier.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • the embodiment of the present application provides another data transmission method after the UE moves from the second mobile communication system to the first mobile communication system, including:
  • Step 2101 The MME entity located in the second mobile communication system determines that the downlink data of the UE is cached in the SGW of the second mobile communication system;
  • Step 2102 The MME entity sends a downlink data cache indication to the SMF entity located in the first mobile communication system, so that the SMF entity activates the PDU session connection corresponding to the cached downlink data of the UE, which is convenient for the user plane function entity. Sending the buffered downlink data to the UE through the PDU session connection.
  • the MME entity sending the downlink data buffer indication to the SMF entity located in the first mobile communication system includes:
  • the MME entity sends the downlink data buffer indication to the AMF entity in the first mobile communication system, and sends the downlink data buffer indication to the SMF entity through the AMF entity.
  • the method further includes:
  • the MME entity receives a fifth request message sent by the AMF entity to request the context information of the UE;
  • the MME entity determines that the UE is in a reachable state after moving to the first mobile communication system.
  • the method further includes:
  • the MME entity requests the SGW to forward the buffered downlink data of the UE to the user plane functional entity.
  • the method further includes:
  • the MME entity sends the EPS bearer identifier corresponding to the buffered downlink data of the UE to the AMF entity, so that the AMF entity determines the PDU session identifier according to the EPS bearer identifier.
  • the first mobile communication system is a 5GS system
  • the second mobile communication system is an EPS system.
  • An embodiment of the present application provides a computer-storable medium on which a computer program is stored, and when the program is executed by a processor, the steps of the data transmission method after the UE moves from the second mobile communication system to the first mobile communication system are implemented.
  • the computer storage medium may be any available medium or data storage device that can be accessed by the computer, including but not limited to magnetic memory (such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (such as CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state hard disk (SSD)), etc.
  • magnetic memory such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical memory such as CD, DVD, BD, HVD, etc.
  • semiconductor memory such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state hard disk (SSD)
  • the application can also be implemented in hardware and/or software (including firmware, resident software, microcode, etc.).
  • the present application may take the form of a computer-usable or computer-readable storage medium on a computer-readable storage medium with computer-usable or computer-readable program code implemented in the medium to be used by an instruction execution system or Used in conjunction with an instruction execution system.
  • a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, transmit, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with an instruction execution system, Use of device or equipment.

Landscapes

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

Abstract

本申请涉及无线通信技术领域，特别涉及一种数据发送方法及设备，用以解决UE发生跨通信系统移动后，还没有一种将源通信系统中缓存的下行数据发送给UE的方案的问题。本申请实施例第二移动通信系统中的MME实体接收位于第一移动通信系统中的SMF实体发送的下行数据缓存指示；MME实体发起建立UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过用户面连接和/或控制面连接发送给UE。由于本申请实施例UE移动到第二移动通信系统后，将第一移动通信系统中缓存的下行数据，通过第二移动通信系统建立的用户面和/或控制面连接发送给UE，避免丢失缓存的UE的下行数据，提高了系统可靠性，进一步提高系统性能。

Description

一种数据发送方法及设备
本申请要求在2018年12月14日提交中国专利局、申请号为201811535571.X、发明名称为“一种数据发送方法及设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，特别涉及一种数据发送方法及设备。
背景技术
由于省电是用户设备(User Equipment，UE)的一个重要设计目标，第三代移动通信标准化组织(3rd Generation Partnership Project，3GPP)定义了省电模式(Power Saving Mode，PSM)和扩展的非连续接收(extended Discontinuous Reception，eDRX)两种UE省电模式。
当UE处于省电模式时，将关闭接入层(Access Stratum，AS)接收机，网络无法寻呼UE，UE处于不可达状态。当有UE的下行数据到达网络时，核心网将对UE的下行数据进行缓存。当UE再次发起注册过程或业务请求过程时，UE将恢复可达状态，核心网将缓存的数据发送给UE。但是，随着UE的移动，UE可能发生跨通信系统切换，例如，具备第四代移动通信技术(4th-Generation,4G)和第五代移动通信技术(5th-Generation,5G)接入能力的UE可能在4G通信系统和5G通信系统之间移动。因此，在UE发生跨通信系统移动后，若源通信系统中缓存有UE的下行数据，UE在移动到目标通信系统后，如何将缓存的下行数据发送给UE成为亟待解决的问题。
综上所述，目前，UE发生跨通信系统移动后，还没有一种将源通信系统中缓存的下行数据发送给UE的方案。
发明内容
本申请提供一种数据发送方法及设备，用以解决UE发生跨通信系统移动后，还没有一种将源通信系统中缓存的下行数据发送给UE的方案的问题。
基于上述问题，第一方面，本申请实施例提供一种数据发送方法，包括：
位于第二移动通信系统中的移动性管理实体(Mobility Management Entity,MME)实体接收位于第一移动通信系统中的会话管理功能实体(Session Management Function,SMF)实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；
所述MME实体发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实 体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
第二方面，本申请实施例提供一种数据发送方法，包括：
位于第一移动通信系统中的SMF实体确定所述第一移动通信系统中缓存有UE的下行数据；
所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
第三方面，本申请实施例提供另一种数据发送方法，包括：
位于所述第一移动通信系统中的SMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
所述SMF实体激活所述UE的缓存的下行数据对应的协议数据单元(Protocol Data Unit,PDU)会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第四方面，本申请实施例提供另一种数据发送方法，包括：
位于第一移动通信系统中的移动性管理实体(Access and Mobility Management Function,AMF)实体接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
所述AMF实体将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第五方面，本申请实施例提供另一种数据发送方法，包括：
位于第二移动通信系统中的MME实体确定所述第二移动通信系统的服务网关(Serving GateWay,SGW)中缓存有UE的下行数据；
所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第六方面，本申请实施例提供第一种MME实体，所述MME实体位于第二移动通信系统中，包括处理器、存储器；
其中，所述处理器，用于读取存储器中的程序并执行：
接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；
发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行 数据通过所述用户面连接和/或控制面连接发送给所述UE。
第七方面，本申请实施例提供第一种SMF实体，所述SMF实体位于第一移动通信系统中，包括处理器、存储器；
其中，所述处理器，用于读取存储器中的程序并执行：
确定所述第一移动通信系统中缓存有UE的下行数据；
向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
第八方面，本申请实施例提供第二种SMF实体，所述SMF实体位于第一移动通信系统中，包括处理器、存储器；
其中，所述处理器，用于读取存储器中的程序并执行：
接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第九方面，本申请实施例提供一种AMF实体，所述AMF实体位于第一移动通信系统中，包括处理器、存储器；
其中，所述处理器，用于读取存储器中的程序并执行：
接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第十方面，本申请实施例提供第二种MME实体，所述MME实体位于第二移动通信系统中，包括处理器、存储器；
其中，所述处理器，用于读取存储器中的程序并执行：
确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第十一方面，本申请实施例提供第三种MME实体，所述MME实体位于第二移动通信系统中，包括：
第一接收模块，用于接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE 的下行数据；
第一处理模块，用于发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
第十二方面，本申请实施例提供第三种SMF实体，所述SMF实体位于第一移动通信系统中，包括：
第一确定模块，用于确定所述第一移动通信系统中缓存有UE的下行数据；
第一发送模块，用于向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
第十三方面，本申请实施例提供第四种SMF实体，所述SMF实体位于第一移动通信系统中，包括：
第二接收模块，用于接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
第二处理模块，用于激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第十四方面，本申请实施例提供另一种AMF实体，所述AMF实体位于第一移动通信系统中，包括：
第三接收模块，用于接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；
第二发送模块，用于将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第十五方面，本申请实施例提供第四种MME实体，所述MME实体位于第二移动通信系统中，包括：
第二确定模块，用于确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
第三发送模块，用于向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
第十六方面，本申请实施例提供一种计算机可存储介质，其上存储有计算机程序，该程序被处理器执行时实现如上述第一方面所述方法的步骤，或实现如上述第二方面所述方法的步骤。
第十七方面，本申请实施例提供另一种计算机可存储介质，其上存储有计算机程序，该程序被处理器执行时实现如上述第三方面所述方法的步骤，或实现如上述第四方面所述方法的步骤，或实现如上述第五方面所述方法的步骤。
由于本申请实施例在UE从第一移动通信系统移动到第二移动通信系统后，第二移动通信系统中的MME实体接收第一移动通信系统中的SMF实体发送的下行数据缓存指示后建立UE的用户面和/或控制面连接，通过建立的用户面和/或控制面将缓存的UE的下行数据发送给UE，从而提供了一种UE移动到第二移动通信系统后，将第一移动通信系统中缓存的下行数据，通过第二移动通信系统建立的用户面和/或控制面连接发送给UE，避免丢失缓存的UE的下行数据，提高了系统可靠性，进一步提高系统性能。
在UE从第二移动通信系统移动到第一移动通信系统后，第一移动通信系统中的SMF实体接收第二移动通信系统中的MME实体发送的下行数据缓存指示后，激活UE的缓存的下行数据对应的PDU会话连接，通过激活的PDU会话连接将缓存的UE的下行数据发送给UE，从而提供了一种UE移动到第一移动通信系统后，将第二移动通信系统中缓存的下行数据，通过第一移动通信系统中激活的PDU会话连接发送给UE，避免丢失缓存的UE的下行数据，提高了系统可靠性，进一步提高系统性能。
附图说明
图1为本申请实施例系统架构示意图；
图2为本申请实施例第一种数据发送系统的结构示意图；
图3为本申请实施例第一种数据发送流程图；
图4为本申请实施例第二种数据发送流程图；
图5为本申请实施例第二种数据发送系统的结构示意图；
图6为本申请实施例第三种数据发送流程图；
图7为本申请实施例第一种MME实体的结构示意图；
图8为本申请实施例第一种SMF实体的结构示意图；
图9为本申请实施例第二种MME实体的结构示意图；
图10为本申请实施例第二种SMF实体的结构示意图；
图11为本申请实施例第一种数据发送方法流程图；
图12为本申请实施例第二种数据发送方法流程图；
图13为本申请实施例第三种SMF实体的结构示意图；
图14为本申请实施例第一种AMF实体的结构示意图；
图15为本申请实施例第三种MME实体的结构示意图；
图16为本申请实施例第四种SMF实体的结构示意图；
图17为本申请实施例第二种AMF实体的结构示意图；
图18为本申请实施例第四种MME实体的结构示意图；
图19为本申请实施例第三种数据发送方法流程图；
图20为本申请实施例第四种数据发送方法流程图；
图21为本申请实施例第五种数据发送方法流程图。
具体实施方式
以下，对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
(1)本申请实施例中，名词“网络”和“系统”经常交替使用，但本领域的技术人员可以理解其含义。
(2)本申请实施例中术语“多个”是指两个或两个以上，其它量词与之类似。
(3)“和/或”，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。字符“/”一般表示前后关联对象是一种“或”的关系。
本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
下面将结合附图对本申请作进一步地详细描述。
为支持UE在演进分组系统(Evolved Packet System，EPS)，(或称为4G系统)和5G系统(5G System)之间的移动性，3GPP定义了EPS系统和5G系统之间的互联(interworking)架构。
如图1所示的网络互联架构，在此架构中，EPS系统中的家乡服务器(Home Subscriber Server，HSS)与5GS系统中的统一数据管理实体(Unified Data Management，UDM)合设，可以表示为HSS+UDM 101；
其中，合设可以理解为合二为一，即将HSS与UDM设置在一起，形成一个结构。
EPS系统中的策略与计费规则功能(Policy and Charging Rules Function，PCRF)，与5GS系统中的策略管理功能实体(Policy Control Function，PCF)合设，可以表示为PCF+PCRF 102；
EPS系统中的分组数据网关-控制面(Packet Data Network GateWay-Control Plane，PGW-C)，与5GS系统中的会话管理功能实体(Session Management Function，SMF)合设，可以表示为SMF+PGW-C 103；
EPS系统中的分组数据网关-用户面(Packet Data Network GateWay-User Plane，PGW-U)，与5GS系统中的用户面功能实体(User Plane Function，UPF)合设，可以表示为UPF+PGW-U 104，在本申请实施例中统称为用户面功能实体；
并且在EPS系统中移动性管理实体106(Mobility Management Entity，MME)和5G系统中接入和移动性管理实体107(Access and Mobility Management Function，AMF)之间定义N26接口，用于在EPS系统和5G系统之间传递UE的上下文信息。
在EPS系统中UE 110可以经演进的通用陆地无线网络(Evolved Universal Terrestrial Radio Access Network，E-UTRAN)108与核心网进行通信；
在5GS系统中UE 110可以经下一代无线接入网(Next Generation-Radio Access Network，NG-RAN)与核心网进行通信。
UE 110可以指接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。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、物联网(Internet of Things,IOT)设备等。
需要说明的是，上述系统架构仅是对本申请实施例适用系统架构的举例说明，本申请实施例适用的系统架构相比图1所示的系统架构还可以增加其它实体，或减少部分实体。
本申请实施例应用于5GS和EPS互联的场景下，在该场景中，UE同时具备4G和5G接入能力，UE能够在EPS系统和5G系统之间移动。
可选的，本申请实施例中，UE在空闲态下发生跨系统移动；具体的，UE在源移动通信系统中处于空闲态，且源移动通信系统中有UE的缓存下行数据，在UE移动到目标通信系统后，通过目标通信系统将源通信系统中缓存的UE的下行数据发送给UE。
本申请实施例的应用场景为：
1、UE从第一移动通信系统移动到第二移动通信系统，且第一移动通信系统中缓存有UE的下行数据；
2、UE从第二移动通信系统移动到第一移动通信系统，且第二移动通信系统中缓存有UE的下行数据。
一种可选的实施方式为，第一移动通信系统为EPS系统，第二移动通信系统为5GS系统；
需要说明的是，在EPS系统中，UE的下行数据缓存在服务网关(Serving GateWay，SGW)中；在5GS系统中UE的下行数据缓存在用户面功能实体或SMF实体中。
下面针对不同的场景分别进行说明。
一、UE从第一移动通信系统移动到第二移动通信系统。
可选的，第一移动通信系统为EPS系统，第二移动通信系统为5GS系统。
如图2所示，本申请实施例数据发送系统包括：MME实体20、SMF实体21、AMF实体22；
其中，SMF实体21位于第一移动通信系统中，MME实体20位于第二移动通信系统中，AMF实体22位于第一移动通信系统；
该SMF实体可以用于执行第一移动通信系统中MME实体的部分功能，主要负责为UE建立会话、管理会话等，可以根据UE的位置信息为UE选择合适的用户面功能实体；
该AMF实体主要功能包括无线接入网络控制平面的终结点，非接入信令的终结点，移动性管理，合法监听，接入授权或鉴权等等。
MME实体20，用于接收SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
SMF实体21，用于确定所述第一移动通信系统中缓存有UE的下行数据；向MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
AMF实体22，用于将接收所述SMF实体发送的下行数据缓存指示，并将所述下行数据缓存指示发送给所述MME实体。
需要说明的是，由于AMF实体与MME实体之间定义有N26接口，在SMF实体需要向MME实体发送下行数据缓存指示时，需要通过AMF实体进行转发。
由于本申请实施例UE是在空闲状态下进行跨系统移动，那么UE在第一移动通信系统中处于不可达状态，且AMF实体记录UE的状态为不可达。
其中，第一移动通信系统中缓存的UE的下行数据包括但不限于：
用户面功能实体中缓存的UE的下行数据、SMF实体中缓存的UE的下行数据。
在SMF实体确定第一移动通信系统中缓存有UE的下行数据时，可以采用如下方式：
1、SMF实体确定自身缓存有所述UE的下行数据；
2、SMF实体确定所述用户面功能实体中缓存有所述UE的下行数据。
SMF实体确定所述第一移动通信系统中缓存有UE的下行数据，向MME实体发送下 行数据缓存指示之前，SMF实体还需要确定当前UE处于可达状态；
一种可选的方式为，AMF实体通知SMF实体UE在第二移动通信系统中处于可达状态。
具体的，空闲态UE从第一移动通信系统移动到第二移动通信系统之后，UE向MME实体发送第一请求消息；可选的，第一请求消息为跟踪区更新(Tracking Area Update，TAU)消息。
MME实体接收所述UE发送的第一请求消息后，向AMF实体发送用于请求所述UE的上下文信息的第二请求消息；可选的，第二请求消息为上下文请求消息，用于请求UE的上下文；
实施中，MME实体通过N26接口向AMF实体发送第二请求消息。
AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体；
可选的，AMF实体采用下列方式通知SMF实体UE在第二移动通信系统中处于可达状态：
AMF实体向SMF实体发送第三请求消息；
SMF实体接收到该第三请求消息后确定UE移动到所述第二移动通信系统后处于可达状态。
其中，该第三请求消息用于请求所述UE的会话管理上下文信息。
在第一移动通信系统中缓存有UE的下行数据时，SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示；
需要说明的是，在SMF实体中缓存有UE的下行数据时，SMF实体在确定UE在第二移动通信系统处于可达状态后，将缓存的UE的下行数据转发至用户面功能实体。
一种可选的方式为，SMF实体在接收到第三请求消息，确定UE在第二移动通信系统处于可达状态后，向AMF实体发送下行数据缓存指示和UE的会话管理上下文信息；
相应的，AMF实体向MME实体返回下行数据缓存指示，以及UE的上下文信息。
MME实体在接收到下行数据缓存指示后，根据UE的上下文信息确定建立用户面连接和/或控制面连接；
具体的，MME实体根据UE的上下文信息确定建立连接的类型；
MME实体可根据UE的上下文信息中的分组数据网络(Packet Data NetWorks,PDN)连接类型确定建立的连接类型；例如在PDN连接类型为仅控制平面(Control Plane only)时，确定建立控制面连接；
或者MME实体根据与UE之前的协商结果来判断连接类型，具体的，UE和MME实体在附着(Attach)和TAU过程中协商连接类型。
需要说明的是，本申请实施例的用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
在建立UE的用户面连接和/或控制面连接之后，用户面功能实体将缓存的下行数据通过建立的用户面连接和/或控制面连接发送给UE。
这里需要说明的是，本申请实施例的网络架构中，将EPS系统和5GS系统中的用户面功能实体合设，在EPS系统中用户面功能实体可称为PGW-G，在5GS系统中可称为UPF实体。因此，当第一移动通信系统的用户面功能实体中缓存有UE的下行数据，在UE移动到第二移动通信系统后，用户面功能实体能够将缓存的UE的下行数据，通过在第二移动通信系统中建立的UE的用户面连接和/或控制面连接下发给UE。
下面以两个具体实施例详细说明本申请实施例的数据发送方法。
实施例1：
在实施例1中，UE从5GS系统移动到EPS系统，且5GS系统的用户面功能实体中缓存有UE的下行数据。
如图3所示，本申请实施例一种数据发送流程图。
步骤301、UE向MME实体发送TAU请求消息；
其中，UE通过基站(evolved Node B,eNB)向MME实体发送TAU请求消息。
步骤302、MME实体向AMF实体发送上下文请求消息；
具体的，MME实体通过N26接口向AMF实体发送上下文请求消息。
步骤303、AMF实体确定UE在EPS系统中处于可达状态。
步骤304、AMF实体向SMF实体发送上下文请求消息，并指示UE在EPS系统中处于可达状态；
其中，该上下文请求消息用于请求会话管理上下文信息。
步骤305、SMF实体确定UE在EPS系统中处于可达状态。
步骤306、SMF实体向AMF实体返回下行数据缓存指示，以及UE的会话管理上下文信息。
步骤307、AMF实体向MME实体发送UE的上下文信息，以及转发SMF实体返回的下行数据缓存指示。
步骤308、MME实体向AMF实体返回确认消息。
步骤309、MME实体根据UE的上下文信息确定建立UE的用户面连接和/或控制面板连接；
其中，UE的用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
具体的，MME实体请求恢复SGW和PGW之间的S5承载，以及请求eNB恢复无线承载和S1承载；
UE的控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接；
具体的，MME实体建立与SGW之间的S11承载。
步骤310、MME实体向UE返回TAU接受消息；
具体的，MME实体通过基站(eNB)向UE返回TAU接受消息。
步骤311、用户面功能实体将缓存的下行数据通过建立的用户面连接和/或控制面连接发送给UE。
实施例2：
UE从5GS系统移动到EPS系统，且5GS系统的SMF实体中缓存有UE的下行数据。
如图4所示，本申请实施例一种数据发送流程图。
步骤401、UE向MME实体发送TAU请求消息；
其中，UE通过基站(eNB)向MME实体发送TAU请求消息。
步骤402、MME实体向AMF实体发送上下文请求消息；
具体的，MME实体通过N26接口向AMF实体发送上下文请求消息。
步骤403、AMF实体确定UE在EPS系统中处于可达状态。
步骤404、AMF实体向SMF实体发送上下文请求消息，并指示UE在EPS系统中处于可达状态；
其中，该上下文请求消息用于请求会话管理上下文信息。
步骤405、SMF实体确定UE在EPS系统中处于可达状态。
步骤406、SMF实体将缓存的所述UE的下行数据转发给用户面功能实体。
步骤407、SMF实体向AMF实体返回下行数据缓存指示，以及UE的会话管理上下文信息。
步骤408、AMF实体向MME实体发送UE的上下文信息，以及转发SMF实体返回的下行数据缓存指示。
步骤409、MME实体向AMF实体返回确认消息。
步骤410、MME实体根据UE的上下文信息确定建立UE的用户面连接和/或控制面板连接；
其中，UE的用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
具体的，MME实体请求恢复SGW和PGW之间的S5承载，以及请求eNB恢复无线承载和S1承载；
UE的控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接；
具体的，MME实体建立与SGW之间的S11承载。
步骤411、MME实体向UE返回TAU接受消息；
具体的，MME实体通过基站(eNB)向UE返回TAU接受消息。
步骤412、用户面功能实体将缓存的下行数据通过建立的用户面连接和/或控制面连接发送给UE。
二、UE从第二移动通信系统移动到第一移动通信系统。
可选的，第一移动通信系统为EPS系统，第二移动通信系统为5GS系统。
如图5所示，本申请实施例数据发送系统包括：SMF实体50、AMF实体51、MME实体52；
其中，SMF实体50位于第一移动通信系统中，AMF实体51位于第一移动通信系统，MME实体52位于第二移动通信系统中；
该SMF实体可以用于执行第一移动通信系统中MME实体的部分功能，主要负责为UE建立会话、管理会话等，可以根据UE的位置信息为UE选择合适的用户面功能实体；
该AMF实体主要功能包括无线接入网络控制平面的终结点，非接入信令的终结点，移动性管理，合法监听，接入授权或鉴权等等。
SMF实体50，用于接收MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
AMF实体51，用于接收MME实体发送的下行数据缓存指示；将所述下行数据缓存指示转发给SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
MME实体52，用于确定所述第二移动通信系统的SGW中缓存有UE的下行数据；向SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
其中，本申请实施例MME实体在向SMF实体发送下行数据缓存指示时，MME实体将下行数据缓存指示发送给AMF实体，通过AMF实体将该下行数据缓存指示转发给SMF实体。
需要说明的是，由于AMF实体与MME实体之间定义有N26接口，在SMF实体50需要向MME实体发送下行数据缓存指示时，需要通过AMF实体进行转发。
由于本申请实施例UE是在空闲状态下进行跨系统移动，那么UE在第二移动通信系统中处于不可达状态。
一种可选的方式为，UE在第二移动通信系统中缓存的下行数据缓存在SGW中，MME实体在确定UE在第一移动通信系统中处于可达状态后，MME实体请求SGW将缓存的UE的下行数据转发到用户面功能实体；
实施中，SGW将缓存的UE的下行数据通过S5接口转发到用户面功能实体。
可选的，MME实体根据下列方式确定UE在第一移动通信系统中处于可达状态：
AMF实体接收所述UE发送的第四请求消息；
其中，所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；可选的，第四请求消息为注册请求消息；
AMF实体向MME实体发送用于请求所述UE上下文信息的第五请求消息；
可选的，所述第五请求消息为上下文请求消息；
MME实体在接收到第五请求消息后，确定UE在第一移动通信系统中处于可达状态。
MME实体在确定UE在第一移动通信系统中处于可达状态，且确定第二移动通信系统的SGW中缓存有UE的下行数据之后，MME实体向AMF实体发送下行数据缓存指示；
另外，MME实体向AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识。
这里需要说明的是，本申请实施例中MME实体通过一条命令将下行数据缓存指示和缓存的下行数据对应的EPS承载标识发送给AMF实体；
或者，MME实体通过不同的命令将下行数据缓存指示和缓存的下行数据对应的EPS承载标识发送给AMF实体；并且MME实体向AMF实体发送下行数据缓存指示和缓存的下行数据对应的EPS承载标识的先后顺序不作限定。
AMF实体接收到MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识之后，将所述EPS承载标识映射成PDU会话标识；
AMF实体根据PDU会话标识确定与该PDU会话关联的SMF实体，并向确定的SMF实体发送该PDU会话标识；
相应的，SMF实体根据AMF实体发送的PDU会话标识确定需要激活的PDU会话连接。
另外，AMF实体将MME实体发送的下行数据缓存指示转发给SMF实体。
这里需要说明的是，AMF实体可以通过一条信令向SMF实体发送PDU会话标识和下行数据缓存指示，或者AMF实体通过不同的信令向SMF实体分别发送PDU会话标识和下行数据缓存指示；
一种可选的方式为，AMF实体向SMF实体发送上下文更新请求消息，该上下文更新请求消息中携带下行数据缓存指示和PDU会话标识。
SMF实体根据AMF实体发送的PDU会话标识确定出需要激活的PDU会话连接之后，激活该PDU会话标识对应的PDU会话连接；
在SMF实体激活PDU会话标识对应的PDU会话连接之后，用户面功能实体将缓存的下行数据通过激活的PDU会话连接发送给UE。
这里需要说明的是，本申请实施例的网络架构中，将EPS系统和5GS系统中的用户面功能实体合设，在EPS系统中用户面功能实体可称为PGW-G，在5GS系统中可称为UPF实体。因此，当第二移动通信系统的用户面功能实体中缓存有UE的下行数据，在UE移动到第一移动通信系统后，用户面功能实体能够将缓存的UE的下行数据，通过在第一移动通信系统中建立的UE的PDU会话连接下发给UE。
下面以一个具体实施例详细说明本申请实施例的数据发送方法。
实施例3：
在实施例3中，UE从EPS系统移动到5GS系统，且EPS系统的SGW中缓存有UE的下行数据。
如图6所示，本申请实施例一种数据发送流程图。
步骤601、UE向AMF实体发送注册请求消息；
其中，UE通过NG-RAN向AMF实体发送注册请求消息。
步骤602、AMF实体向MME实体发送上下文请求消息；
具体的，AMF实体通过N26接口向MME实体发送上下文请求消息。
步骤603、MME实体确定UE在5GS系统中处于可达状态。
步骤604、MME实体请求SGW将缓存的所述UE的下行数据转发给用户面功能实体。
步骤605、SGW将缓存的所述UE的下行数据转发给用户面功能实体；
具体的，SGW将缓存的所述UE的下行数据通过S5接口转发给用户面功能实体。
步骤606、MME实体向AMF实体发送下行数据缓存指示，以及MME实体向AMF实体发送缓存的下行数据对应的EPS承载标识；
可选的，MME实体通过响应消息将下行数据缓存指示和缓存的下行数据对应的EPS承载标识发送给AMF实体。
步骤607、AMF实体将EPS承载标识映射成PDU会话标识。
步骤608、AMF实体向SMF实体发送上下文更新请求消息；
其中，该上下文更新请求消息中包含下行数据缓存指示和PDU会话标识。
步骤609、SMF实体在接收到下行数据缓存指示后，根据PDU会话标识激活对应的PDU会话连接。
步骤610、AMF实体向UE返回注册接受消息。
步骤611、用户面功能实体通过激活的PDU会话连接将缓存的UE的下行数据发送给 UE。
如图7所示，本申请实施例第一种MME实体，所述MME实体位于第二移动通信系统中，包括：处理器700、存储器701、收发机702以及总线接口。
处理器700负责管理总线架构和通常的处理，存储器701可以存储处理器700在执行操作时所使用的数据。收发机702用于在处理器700的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器700代表的一个或多个处理器和存储器701代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器700负责管理总线架构和通常的处理，存储器701可以存储处理器700在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器700中，或者由处理器700实现。在实现过程中，信号处理流程的各步骤可以通过处理器700中的硬件的集成逻辑电路或者软件形式的指令完成。处理器700可以是通用处理器、数字信号处理器、专用集成电路、现场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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。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701，处理器700读取存储器701中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器700，用于读取存储器701中的程序并执行：
接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；
发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述处理器700具体用于：
接收所述SMF实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，所述处理器700还用于：
在接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示之前，接收所述UE发送的第一请求消息；其中所述第一请求消息为所述UE从第一移动通信系统移动到第二移动通信系统后发送的；
向所述第一移动通信系统中的AMF实体发送用于请求所述UE的上下文信息的第二 请求消息，以使所述AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体，以便所述SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示。
可选的，所述第一请求消息为TAU请求消息。
可选的，所述UE的下行数据缓存在所述第一移动通信系统的用户面功能实体中；
或，所述UE的下行数据缓存在所述第一移动通信系统的SMF实体中。
可选的，所述处理器700具体用于：
根据所述UE的上下文信息来确定建立用户面连接和/或控制面连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
如图8所示，本申请实施例第一种SMF实体，SMF实体位于第一移动通信系统中，包括：处理器800、存储器801、收发机802以及总线接口。
处理器800负责管理总线架构和通常的处理，存储器801可以存储处理器800在执行操作时所使用的数据。收发机802用于在处理器800的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器800代表的一个或多个处理器和存储器801代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器800负责管理总线架构和通常的处理，存储器801可以存储处理器800在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器800中，或者由处理器800实现。在实现过程中，信号处理流程的各步骤可以通过处理器800中的硬件的集成逻辑电路或者软件形式的指令完成。处理器800可以是通用处理器、数字信号处理器、专用集成电路、现场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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。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801，处理器800读取存储器801中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器800，用于读取存储器801中的程序并执行：
确定所述第一移动通信系统中缓存有UE的下行数据；
向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述处理器800具体用于：
将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述MME实体。
可选的，所述处理器800具体用于：
确定所述SMF实体缓存有所述UE的下行数据；
或，确定所述用户面功能实体中缓存有所述UE的下行数据。
可选的，所述处理器800还用于：
在向位于第二移动通信系统中的MME实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE的会话管理上下文信息的第三请求消息；其中，所述第三请求消息为所述AMF实体接收到所述MME实体发送的用于请求所述UE上下文信息的第二请求消息，确定所述UE处于可达状态后发送的；
确定所述UE移动到所述第二移动通信系统后处于可达状态。
可选的，所述处理器800还用于：
在所述SMF实体中缓存有所述UE的下行数据时，在确定所述UE移动到所述第二移动通信系统后处于可达状态之后，将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
如图9所示，本申请实施例第二种MME实体，所述MME实体位于第二移动通信系统中，包括：
第一接收模块901，用于接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；
第一处理模块902，用于发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述第一接收模块901具体用于：
接收所述SMF实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，所述第一接收模块901还用于：
在接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示之前，接收所述UE发送的第一请求消息；其中所述第一请求消息为所述UE从第一移动通信系统移动到第二移动通信系统后发送的；
向所述第一移动通信系统中的AMF实体发送用于请求所述UE的上下文信息的第二请求消息，以使所述AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体，以便所述SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示。
可选的，所述第一请求消息为TAU请求消息。
可选的，所述UE的下行数据缓存在所述第一移动通信系统的用户面功能实体中；
或，所述UE的下行数据缓存在所述第一移动通信系统的SMF实体中。
可选的，第一处理模块902具体用于：
根据所述UE的上下文信息来确定建立用户面连接和/或控制面连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
如图10所示，本申请实施例第二种SMF实体，所述SMF实体位于第一移动通信系统中，包括：
第一确定模块1001，用于确定所述第一移动通信系统中缓存有UE的下行数据；
第一发送模块1002，用于向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述第一发送模块1002具体用于：
将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述MME实体。
可选的，所述第一确定模块1001具体用于：
确定所述SMF实体缓存有所述UE的下行数据；
或，确定所述用户面功能实体中缓存有所述UE的下行数据。
可选的，所述第一发送模块1002还用于：
在向位于第二移动通信系统中的MME实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE的会话管理上下文信息的第三请求消息；其中，所述第三请求消息为所述AMF实体接收到所述MME实体发送的用于请求所述UE上下文信息的第二请求消息，确定所述UE处于可达状态后发送的；
确定所述UE移动到所述第二移动通信系统后处于可达状态。
可选的，所述第一确定模块1001还用于：
在所述SMF实体中缓存有所述UE的下行数据时，在确定所述UE移动到所述第二移动通信系统后处于可达状态之后，将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
需要说明的是，上述图7、图9所示的MME实体执行的功能，以及上述图8、图10所示的SMF实体执行的功能，适用于UE从第一移动通信系统移动到第二移动通信系统的场景。
如图11所示，本申请实施例在UE从第一移动通信系统移动到第二移动通信系统时，提供了一种数据发送方法，包括：
步骤1101、位于第二移动通信系统中的MME实体接收位于第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有所述UE的下行数据；
步骤1102、所述MME实体发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述MME实体接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示，包括：
所述MME实体接收所述SMF实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，在所述MME实体接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示之前，还包括：
所述MME实体接收所述UE发送的第一请求消息；其中所述第一请求消息为所述UE从第一移动通信系统移动到第二移动通信系统后发送的；
所述MME实体向所述第一移动通信系统中的AMF实体发送用于请求所述UE的上下文信息的第二请求消息，以使所述AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体，以便所述SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示。
可选的，所述第一请求消息为TAU请求消息。
可选的，所述UE的下行数据缓存在所述第一移动通信系统的用户面功能实体中；
或，所述UE的下行数据缓存在所述第一移动通信系统的SMF实体中。
可选的，所述MME实体发起建立所述UE的用户面连接和/或控制面连接，包括：
所述MME实体根据所述UE的上下文信息来确定建立用户面连接和/或控制面连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
如图12所示，本申请实施例在UE从第一移动通信系统移动到第二移动通信系统时，提供了另一种数据发送方法，包括：
步骤1201、位于第一移动通信系统中的SMF实体确定所述第一移动通信系统中缓存有UE的下行数据；
步骤1202、所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
可选的，所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示，包括：
所述SMF实体将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述MME实体。
可选的，所述SMF实体确定所述第一移动通信系统中缓存有所述UE的下行数据，包括：
所述SMF实体确定自身缓存有所述UE的下行数据；
或，所述SMF实体确定所述用户面功能实体中缓存有所述UE的下行数据。
可选的，在所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示之前，还包括：
所述SMF实体接收所述AMF实体发送的用于请求所述UE的会话管理上下文信息的 第三请求消息；其中，所述第三请求消息为所述AMF实体接收到所述MME实体发送的用于请求所述UE上下文信息的第二请求消息，确定所述UE处于可达状态后发送的；
所述SMF实体确定所述UE移动到所述第二移动通信系统后处于可达状态。
可选的，在所述SMF实体中缓存有所述UE的下行数据时，在所述SMF实体确定所述UE移动到所述第二移动通信系统后处于可达状态之后，还包括：
所述SMF实体将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
可选的，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
本申请实施例提供一种计算机可存储介质，其上存储有计算机程序，该程序被处理器执行时实现上述在UE从第一移动通信系统移动到第二移动通信系统后数据发送方法的步骤。
如图13所示，本申请实施例第三种SMF实体，SMF实体位于第一移动通信系统中，包括：处理器1300、存储器1301、收发机1302以及总线接口。
处理器1300负责管理总线架构和通常的处理，存储器1301可以存储处理器1300在执行操作时所使用的数据。收发机1302用于在处理器1300的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器1300代表的一个或多个处理器和存储器1301代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器1300负责管理总线架构和通常的处理，存储器1301可以存储处理器1300在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器1300中，或者由处理器1300实现。在实现过程中，信号处理流程的各步骤可以通过处理器1300中的硬件的集成逻辑电路或者软件形式的指令完成。处理器1300可以是通用处理器、数字信号处理器、专用集成电路、现场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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。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1301，处理器1300读取存储器1301中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器1300，用于读取存储器1301中的程序并执行：
接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述处理器1300具体用于：
接收所述MME实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，所述处理器1300具体用于：
根据所述AMF实体发送的PDU会话标识，确定需要激活的PDU会话连接；其中，所述PDU会话标识是所述AMF实体根据接收到的所述UE的缓存的下行数据对应的EPS承载标识确定的。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图14所示，本申请实施例第一种AMF实体，AMF实体位于第一移动通信系统中，包括：处理器1400、存储器1401、收发机1402以及总线接口。
处理器1400负责管理总线架构和通常的处理，存储器1401可以存储处理器1400在执行操作时所使用的数据。收发机1402用于在处理器1400的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器1400代表的一个或多个处理器和存储器1401代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器1400负责管理总线架构和通常的处理，存储器1401可以存储处理器1400在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器1400中，或者由处理器1400实现。在实现过程中，信号处理流程的各步骤可以通过处理器1400中的硬件的集成逻辑电路或者软件形式的指令完成。处理器1400可以是通用处理器、数字信号处理器、专用集成电路、现场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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。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1401，处理器1400读取存储器1401中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器1400，用于读取存储器1401中的程序并执行：
接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述处理器1400还用于：
在接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示之前，接收所述UE发送的第四请求消息；其中所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；
向所述MME实体发送用于请求所述UE上下文信息的第五请求消息，以使所述MME实体接收到所述第五请求消息后确定UE移动到所述第一移动通信系统后处于可达状态，并在确定所述UE处于可达状态后发送所述下行数据缓存指示。
可选的，所述处理器1400还用于：
接收所述MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识；将所述EPS承载标识映射成PDU会话标识；将所述PDU会话标识发送给所述SMF实体，以使所述SMF实体根据所述PDU会话标识确定需要激活的PDU会话连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图15所示，本申请实施例第三种MME实体，MME实体位于第二移动通信系统中，包括：处理器1500、存储器1501、收发机1502以及总线接口。
处理器1500负责管理总线架构和通常的处理，存储器1501可以存储处理器1500在执行操作时所使用的数据。收发机1502用于在处理器1500的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器1500代表的一个或多个处理器和存储器1501代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器1500负责管理总线架构和通常的处理，存储器1501可以存储处理器1500在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器1500中，或者由处理器1500实现。在实现过程中，信号处理流程的各步骤可以通过处理器1500中的硬件的集成逻辑电路或者软件形式的指令完成。处理器1500可以是通用处理器、数字信号处理器、专用集成电路、现场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，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。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1501，处理器1500读取存储器1501中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器1500，用于读取存储器1501中的程序并执行：
确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述处理器1500具体用于：
将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述SMF实体。
可选的，所述处理器1500还用于：
在向位于第一移动通信系统中的SMF实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE上下文信息的第五请求消息；确定UE移动到所述第一移动通信系统后处于可达状态。
可选的，所述处理器1500还用于：
在确定UE移动到所述第一移动通信系统后处于可达状态之后，请求所述SGW将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，所述处理器1500还用于：
向所述AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识，以使所述AMF实体根据所述EPS承载标识确定PDU会话标识。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图16所示，本申请实施例第四种SMF实体，所述SMF实体位于第一移动通信系统中，包括：
第二接收模块1601，用于接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
第二处理模块1602，用于激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述第二接收模块1601具体用于：
接收所述MME实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，所述第二处理模块1602具体用于：
根据所述AMF实体发送的PDU会话标识，确定需要激活的PDU会话连接；其中， 所述PDU会话标识是所述AMF实体根据接收到的所述UE的缓存的下行数据对应的EPS承载标识确定的。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图17所示，本申请实施例第二种AMF实体，所述AMF实体位于第一移动通信系统中，包括：
第三接收模块1701，用于接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；
第二发送模块1702，用于将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述第三接收模块1701还用于：
在接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示之前，接收所述UE发送的第四请求消息；其中所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；
向所述MME实体发送用于请求所述UE上下文信息的第五请求消息，以使所述MME实体接收到所述第五请求消息后确定UE移动到所述第一移动通信系统后处于可达状态，并在确定所述UE处于可达状态后发送所述下行数据缓存指示。
可选的，所述第三接收模块1701还用于：
接收所述MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识；将所述EPS承载标识映射成PDU会话标识；将所述PDU会话标识发送给所述SMF实体，以使所述SMF实体根据所述PDU会话标识确定需要激活的PDU会话连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图18所示，本申请实施例第四种MME实体，所述MME实体位于第二移动通信系统中，包括：
第二确定模块1801，用于确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
第三发送模块1802，用于向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述第三发送模块1802具体用于：
将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述SMF实体。
可选的，所述第三发送模块1802还用于：
在向位于第一移动通信系统中的SMF实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE上下文信息的第五请求消息；确定UE移动到所述第一移动通信系统后处于可达状态。
可选的，所述第三发送模块1802还用于：
在确定UE移动到所述第一移动通信系统后处于可达状态之后，请求所述SGW将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，所述第三发送模块1802还用于：
向所述AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识，以使所述AMF实体根据所述EPS承载标识确定PDU会话标识。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
需要说明的是，上述图13、图16所示的SMF实体执行的功能，上述图14、图17所示的AMF实体执行的功能，以及上述图15、图18所示的MME实体执行的功能，适用于UE从第二移动通信系统移动到第一移动通信系统的场景。
如图19所示，本申请实施例在UE从第二移动通信系统移动到第一移动通信系统后，提供一种数据发送方法，包括：
步骤1901、位于第一移动通信系统中的SMF实体接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有所述UE的下行数据；
步骤1902、所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述SMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示，包括：
所述SMF实体接收所述MME实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
可选的，所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，包括：
所述SMF实体根据所述AMF实体发送的PDU会话标识，确定需要激活的PDU会话连接；其中，所述PDU会话标识是所述AMF实体根据接收到的所述UE的缓存的下行数据对应的EPS承载标识确定的。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图20所示，本申请实施例在UE从第二移动通信系统移动到第一移动通信系统后，提供另一种数据发送方法，包括：
步骤2001、位于所述第一移动通信系统中的AMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示；
步骤2002、所述AMF实体将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述AMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示之前，还包括：
所述AMF实体接收所述UE发送的第四请求消息；其中所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；
所述AMF实体向所述MME实体发送用于请求所述UE上下文信息的第五请求消息，以使所述MME实体接收到所述第五请求消息后确定UE移动到所述第一移动通信系统后处于可达状态，并在确定所述UE处于可达状态后发送所述下行数据缓存指示。
可选的，该方法还包括：
所述AMF实体接收所述MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识；
所述AMF实体将所述EPS承载标识映射成PDU会话标识；
所述AMF实体将所述PDU会话标识发送给所述SMF实体，以使所述SMF实体根据所述PDU会话标识确定需要激活的PDU会话连接。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
如图21所示，本申请实施例在UE从第二移动通信系统移动到第一移动通信系统后，提供另一种数据发送方法，包括：
步骤2101、位于第二移动通信系统中的MME实体确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
步骤2102、所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
可选的，所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，包括：
所述MME实体将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述SMF实体。
可选的，在所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示之前，还包括：
所述MME实体接收所述AMF实体发送的用于请求所述UE上下文信息的第五请求消息；
所述MME实体确定UE移动到所述第一移动通信系统后处于可达状态。
可选的，在所述MME实体确定UE移动到所述第一移动通信系统后处于可达状态之后，还包括：
所述MME实体请求所述SGW将缓存的所述UE的下行数据转发给所述用户面功能实体。
可选的，该方法还包括：
所述MME实体向所述AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识，以使所述AMF实体根据所述EPS承载标识确定PDU会话标识。
可选的，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
本申请实施例提供一种计算机可存储介质，其上存储有计算机程序，该程序被处理器执行时实现上述在UE从第二移动通信系统移动到第一移动通信系统后数据发送方法的步骤。
所述计算机存储介质可以是计算机能够存取的任何可用介质或数据存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如CD、DVD、BD、HVD等)、以及半导体存储器(例如ROM、EPROM、EEPROM、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
以上参照示出根据本申请实施例的方法、装置(系统)和/或计算机程序产品的框图和/或流程图描述本申请。应理解，可以通过计算机程序指令来实现框图和/或流程图示图的一个块以及框图和/或流程图示图的块的组合。可以将这些计算机程序指令提供给通用计算机、专用计算机的处理器和/或其它可编程数据处理装置，以产生机器，使得经由计算机处理器和/或其它可编程数据处理装置执行的指令创建用于实现框图和/或流程图块中所指定的功能/动作的方法。
相应地，还可以用硬件和/或软件(包括固件、驻留软件、微码等)来实施本申请。更进一步地，本申请可以采取计算机可使用或计算机可读存储介质上的计算机程序产品的形式，其具有在介质中实现的计算机可使用或计算机可读程序代码，以由指令执行系统来使用或结合指令执行系统而使用。在本申请上下文中，计算机可使用或计算机可读介质可以是任意介质，其可以包含、存储、通信、传输、或传送程序，以由指令执行系统、装置或设备使用，或结合指令执行系统、装置或设备使用。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (65)

  1. 一种数据发送方法，其特征在于，该方法包括：
    位于第二移动通信系统中的移动性管理MME实体接收位于第一移动通信系统中的会话管理功能SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有UE的下行数据；
    所述MME实体发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  2. 如权利要求1所述的方法，其特征在于，所述MME实体接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示，包括：
    所述MME实体接收所述SMF实体通过所述第一移动通信系统中的接入和移动性管理功能AMF实体发送的下行数据缓存指示。
  3. 如权利要求1所述的方法，其特征在于，在所述MME实体接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示之前，还包括：
    所述MME实体接收所述UE发送的第一请求消息；其中所述第一请求消息为所述UE从第一移动通信系统移动到第二移动通信系统后发送的；
    所述MME实体向所述第一移动通信系统中的AMF实体发送用于请求所述UE的上下文信息的第二请求消息，以使所述AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体，以便所述SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示。
  4. 如权利要求3所述的方法，其特征在于，所述第一请求消息为跟踪区更新TAU请求消息。
  5. 如权利要求1所述的方法，其特征在于，所述UE的下行数据缓存在所述第一移动通信系统的用户面功能实体中；
    或，所述UE的下行数据缓存在所述第一移动通信系统的SMF实体中。
  6. 如权利要求1所述的方法，其特征在于，所述MME实体发起建立所述UE的用户面连接和/或控制面连接，包括：
    所述MME实体根据所述UE的上下文信息来确定建立用户面连接和/或控制面连接。
  7. 如权利要求1～6任一项所述的方法，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  8. 如权利要求1～6任一项所述的方法，其特征在于，所述用户面连接是指下行数据经由服务网关SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
    所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
  9. 一种数据发送方法，其特征在于，该方法包括：
    位于第一移动通信系统中的SMF实体确定所述第一移动通信系统中缓存有UE的下行数据；
    所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  10. 如权利要求9所述的方法，其特征在于，所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示，包括：
    所述SMF实体将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述MME实体。
  11. 如权利要求9所述的方法，其特征在于，所述SMF实体确定所述第一移动通信系统中缓存有所述UE的下行数据，包括：
    所述SMF实体确定自身缓存有所述UE的下行数据；
    或，所述SMF实体确定所述用户面功能实体中缓存有所述UE的下行数据。
  12. 如权利要求9所述的方法，其特征在于，在所述SMF实体向位于第二移动通信系统中的MME实体发送下行数据缓存指示之前，还包括：
    所述SMF实体接收所述AMF实体发送的用于请求所述UE的会话管理上下文信息的第三请求消息；其中，所述第三请求消息为所述AMF实体接收到所述MME实体发送的用于请求所述UE上下文信息的第二请求消息，确定所述UE处于可达状态后发送的；
    所述SMF实体确定所述UE移动到所述第二移动通信系统后处于可达状态。
  13. 如权利要求12所述的方法，其特征在于，在所述SMF实体中缓存有所述UE的下行数据时，在所述SMF实体确定所述UE移动到所述第二移动通信系统后处于可达状态之后，还包括：
    所述SMF实体将缓存的所述UE的下行数据转发给所述用户面功能实体。
  14. 如权利要求9～13任一项所述的方法，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  15. 如权利要求9～13任一项所述的方法，其特征在于，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
    所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
  16. 一种数据发送方法，其特征在于，该方法包括：
    位于第一移动通信系统中的SMF实体接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有UE的下行数据；
    所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  17. 如权利要求16所述的方法，其特征在于，所述SMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示，包括：
    所述SMF实体接收所述MME实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
  18. 如权利要求17所述的方法，其特征在于，所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，包括：
    所述SMF实体根据所述AMF实体发送的PDU会话标识，确定需要激活的PDU会话连接；其中，所述PDU会话标识是所述AMF实体根据接收到的所述UE的缓存的下行数据对应的EPS承载标识确定的。
  19. 如权利要求16～18任一项所述的方法，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  20. 一种数据发送方法，其特征在于，该方法包括：
    位于第一移动通信系统中的AMF实体接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
    所述AMF实体将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  21. 如权利要求20所述的方法，其特征在于，所述AMF实体接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示之前，还包括：
    所述AMF实体接收所述UE发送的第四请求消息；其中所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；
    所述AMF实体向所述MME实体发送用于请求所述UE上下文信息的第五请求消息，以使所述MME实体接收到所述第五请求消息后确定UE移动到所述第一移动通信系统后 处于可达状态，并在确定所述UE处于可达状态后发送所述下行数据缓存指示。
  22. 如权利要求20所述的方法，其特征在于，该方法还包括：
    所述AMF实体接收所述MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识；
    所述AMF实体将所述EPS承载标识映射成PDU会话标识；
    所述AMF实体将所述PDU会话标识发送给所述SMF实体，以使所述SMF实体根据所述PDU会话标识确定需要激活的PDU会话连接。
  23. 如权利要求20～22任一项所述的方法，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  24. 一种数据发送方法，其特征在于，该方法包括：
    位于第二移动通信系统中的MME实体确定所述第二移动通信系统的SGW中缓存有UE的下行数据；
    所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  25. 如权利要求24所述的方法，其特征在于，所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，包括：
    所述MME实体将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述SMF实体。
  26. 如权利要求24所述的方法，其特征在于，在所述MME实体向位于第一移动通信系统中的SMF实体发送下行数据缓存指示之前，还包括：
    所述MME实体接收所述AMF实体发送的用于请求所述UE上下文信息的第五请求消息；
    所述MME实体确定UE移动到所述第一移动通信系统后处于可达状态。
  27. 如权利要求26所述的方法，其特征在于，在所述MME实体确定UE移动到所述第一移动通信系统后处于可达状态之后，还包括：
    所述MME实体请求所述SGW将缓存的所述UE的下行数据转发给所述用户面功能实体。
  28. 如权利要求24所述的方法，其特征在于，该方法还包括：
    所述MME实体向所述AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识，以使所述AMF实体根据所述EPS承载标识确定PDU会话标识。
  29. 如权利要求24～28任一项所述的方法，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  30. 一种MME实体，其特征在于，所述MME实体位于第二移动通信系统中，包括处理器、存储器；
    其中，所述处理器，用于读取所述存储器中的程序并执行：
    接收位于第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有UE的下行数据；
    发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  31. 如权利要求30所述的MME实体，其特征在于，所述处理器具体用于：
    接收所述SMF实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
  32. 如权利要求30所述的MME实体，其特征在于，所述处理器还用于：
    在接收位于所述第一移动通信系统中的SMF实体发送的下行数据缓存指示之前，接收所述UE发送的第一请求消息；其中所述第一请求消息为所述UE从第一移动通信系统移动到第二移动通信系统后发送的；
    向所述第一移动通信系统中的AMF实体发送用于请求所述UE的上下文信息的第二请求消息，以使所述AMF实体接收到所述第二请求消息后确定所述UE移动到所述第二移动通信系统后处于可达状态，并通知所述SMF实体，以便所述SMF实体在确定UE处于可达状态后发送所述下行数据缓存指示。
  33. 如权利要求32所述的MME实体，其特征在于，所述第一请求消息为TAU请求消息。
  34. 如权利要求30所述的MME实体，其特征在于，所述UE的下行数据缓存在所述第一移动通信系统的用户面功能实体中；
    或，所述UE的下行数据缓存在所述第一移动通信系统的SMF实体中。
  35. 如权利要求30所述的MME实体，其特征在于，所述处理器具体用于：
    根据所述UE的上下文信息来确定建立用户面连接和/或控制面连接。
  36. 如权利要求30～35任一项所述的MME实体，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  37. 如权利要求30～35任一项所述的MME实体，其特征在于，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
    所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
  38. 一种SMF实体，其特征在于，所述SMF实体位于第一移动通信系统中，包括处理器、存储器；
    其中，所述处理器，用于读取所述存储器中的程序并执行：
    确定第一移动通信系统中缓存有UE的下行数据；
    向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  39. 如权利要求38所述的SMF实体，其特征在于，所述处理器具体用于：
    将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述MME实体。
  40. 如权利要求38所述的SMF实体，其特征在于，所述处理器具体用于：
    确定所述SMF实体缓存有所述UE的下行数据；
    或，确定所述用户面功能实体中缓存有所述UE的下行数据。
  41. 如权利要求38所述的SMF实体，其特征在于，所述处理器还用于：
    在向位于第二移动通信系统中的MME实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE的会话管理上下文信息的第三请求消息；其中，所述第三请求消息为所述AMF实体接收到所述MME实体发送的用于请求所述UE上下文信息的第二请求消息，确定所述UE处于可达状态后发送的；
    确定所述UE移动到所述第二移动通信系统后处于可达状态。
  42. 如权利要求41所述的SMF实体，其特征在于，所述处理器还用于：
    在所述SMF实体中缓存有所述UE的下行数据时，在确定所述UE移动到所述第二移动通信系统后处于可达状态之后，将缓存的所述UE的下行数据转发给所述用户面功能实体。
  43. 如权利要求38～42任一项所述的SMF实体，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  44. 如权利要求38～42任一项所述的SMF实体，其特征在于，所述用户面连接是指下行数据经由SGW发送到基站，再由所述基站经由数据无线承载发送给所述UE的连接；
    所述控制面连接是指下行数据经由SGW发送到MME实体，再由所述MME实体经由NAS消息发送给所述UE的连接。
  45. 一种SMF实体，其特征在于，所述SMF实体位于第一移动通信系统中，包括处理器、存储器；
    其中，所述处理器，用于读取所述存储器中的程序并执行：
    接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有UE的下行数据；
    激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  46. 如权利要求45所述的SMF实体，其特征在于，所述处理器具体用于：
    接收所述MME实体通过所述第一移动通信系统中的AMF实体发送的下行数据缓存指示。
  47. 如权利要求46所述的SMF实体，其特征在于，所述处理器具体用于：
    根据所述AMF实体发送的PDU会话标识，确定需要激活的PDU会话连接；其中，所述PDU会话标识是所述AMF实体根据接收到的所述UE的缓存的下行数据对应的EPS承载标识确定的。
  48. 如权利要求45～47任一项所述的SMF实体，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  49. 一种AMF实体，其特征在于，所述AMF实体位于第一移动通信系统中，包括处理器、存储器；
    其中，所述处理器，用于读取所述存储器中的程序并执行：
    接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
    将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  50. 如权利要求49所述的AMF实体，其特征在于，所述处理器还用于：
    在接收位于所述第二移动通信系统中的MME实体发送的下行数据缓存指示之前，接收所述UE发送的第四请求消息；其中所述第四请求消息为所述UE从第二移动通信系统移动到第一移动通信系统后发送的；
    向所述MME实体发送用于请求所述UE上下文信息的第五请求消息，以使所述MME实体接收到所述第五请求消息后确定UE移动到所述第一移动通信系统后处于可达状态，并在确定所述UE处于可达状态后发送所述下行数据缓存指示。
  51. 如权利要求49所述的AMF实体，其特征在于，所述处理器还用于：
    接收所述MME实体发送的所述UE的缓存的下行数据对应的EPS承载标识；将所述EPS承载标识映射成PDU会话标识；将所述PDU会话标识发送给所述SMF实体，以使所述SMF实体根据所述PDU会话标识确定需要激活的PDU会话连接。
  52. 如权利要求49～51任一项所述的AMF实体，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  53. 一种MME实体，其特征在于，所述MME实体位于第二移动通信系统中，包括处理器、存储器；
    其中，所述处理器，用于读取所述存储器中的程序并执行：
    确定第二移动通信系统的SGW中缓存有UE的下行数据；
    向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  54. 如权利要求53所述的MME实体，其特征在于，所述处理器具体用于：
    将所述下行数据缓存指示发送给所述第一移动通信系统中的AMF实体，通过所述AMF实体将所述下行数据缓存指示发送给所述SMF实体。
  55. 如权利要求53所述的MME实体，其特征在于，所述处理器还用于：
    在向位于第一移动通信系统中的SMF实体发送下行数据缓存指示之前，接收所述AMF实体发送的用于请求所述UE上下文信息的第五请求消息；确定UE移动到所述第一移动通信系统后处于可达状态。
  56. 如权利要求55所述的MME实体，其特征在于，所述处理器还用于：
    在确定UE移动到所述第一移动通信系统后处于可达状态之后，请求所述SGW将缓存的所述UE的下行数据转发给所述用户面功能实体。
  57. 如权利要求53所述的MME实体，其特征在于，所述处理器还用于：
    向所述AMF实体发送所述UE的缓存的下行数据对应的EPS承载标识，以使所述AMF实体根据所述EPS承载标识确定PDU会话标识。
  58. 如权利要求53～57任一项所述的MME实体，其特征在于，所述第一移动通信系统为5GS系统，所述第二移动通信系统为EPS系统。
  59. 一种MME实体，其特征在于，所述MME实体位于第二移动通信系统中，包括：
    第一接收模块，用于接收位于第一移动通信系统中的SMF实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第一移动通信系统中缓存有UE的下行数据；
    第一处理模块，用于发起建立所述UE的用户面连接和/或控制面连接，以使用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  60. 一种SMF实体，其特征在于，所述SMF实体位于第一移动通信系统中，包括：
    第一确定模块，用于确定第一移动通信系统中缓存有UE的下行数据；
    第一发送模块，用于向位于第二移动通信系统中的MME实体发送下行数据缓存指示，以使所述MME实体在接收到所述下行数据缓存指示后发起建立所述UE的用户面连接和/或控制面连接，便于用户面功能实体将缓存的下行数据通过所述用户面连接和/或控制面连接发送给所述UE。
  61. 一种SMF实体，其特征在于，所述SMF实体位于第一移动通信系统中，包括：
    第二接收模块，用于接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；其中，所述下行数据缓存指示用于指示所述第二移动通信系统中缓存有UE的下行数据；
    第二处理模块，用于激活所述UE的缓存的下行数据对应的PDU会话连接，以使用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  62. 一种AMF实体，其特征在于，所述AMF实体位于第一移动通信系统中，包括：
    第三接收模块，用于接收位于第二移动通信系统中的MME实体发送的下行数据缓存指示；
    第二发送模块，用于将所述下行数据缓存指示转发给位于所述第一移动通信系统中的SMF实体，以使所述SMF实体激活UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  63. 一种MME实体，其特征在于，所述MME实体位于第二移动通信系统中，包括：
    第二确定模块，用于确定第二移动通信系统的SGW中缓存有UE的下行数据；
    第三发送模块，用于向位于第一移动通信系统中的SMF实体发送下行数据缓存指示，以使所述SMF实体激活所述UE的缓存的下行数据对应的PDU会话连接，便于用户面功能实体将缓存的下行数据通过所述PDU会话连接发送给所述UE。
  64. 一种计算机可存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现如权利要求1～8任一所述方法的步骤或实现如权利要求9～15任一所述方法的步骤。
  65. 一种计算机可存储介质，其上存储有计算机程序，其特征在于，该程序被处理器执行时实现如权利要求16～19任一所述方法的步骤，或实现如权利要求20～23任一所述方法的步骤，或实现如权利要求24～29任一所述方法的步骤。
PCT/CN2019/119251 2018-12-14 2019-11-18 一种数据发送方法及设备 WO2020119404A1 (zh)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020217022006A KR102505630B1 (ko) 2018-12-14 2019-11-18 데이터 전송 방법 및 장치
EP19896235.9A EP3897036B1 (en) 2018-12-14 2019-11-18 Data transmission method and device
EP23154727.4A EP4221360A1 (en) 2018-12-14 2019-11-18 Data transmission methods in amf entity, smf entity and mme entity for transmitting buffered downklink data of a ue in eps-to-5gs mobility
US17/311,694 US11405834B2 (en) 2018-12-14 2019-11-18 Data transmission method and device
JP2021534129A JP7206390B2 (ja) 2018-12-14 2019-11-18 データの送信方法およびデバイス

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811535571.XA CN111328115B (zh) 2018-12-14 2018-12-14 一种数据发送方法及设备
CN201811535571.X 2018-12-14

Publications (1)

Publication Number Publication Date
WO2020119404A1 true WO2020119404A1 (zh) 2020-06-18

Family

ID=71076232

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2019/119251 WO2020119404A1 (zh) 2018-12-14 2019-11-18 一种数据发送方法及设备

Country Status (6)

Country Link
US (1) US11405834B2 (zh)
EP (2) EP4221360A1 (zh)
JP (1) JP7206390B2 (zh)
KR (1) KR102505630B1 (zh)
CN (1) CN111328115B (zh)
WO (1) WO2020119404A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022074115A (ja) * 2020-10-30 2022-05-17 宏碁股▲分▼有限公司 モビリティを処理する装置及び方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110234112B (zh) * 2018-03-05 2020-12-04 华为技术有限公司 消息处理方法、系统及用户面功能设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018067956A1 (en) * 2016-10-06 2018-04-12 Convida Wireless, Llc Session management with relaying and charging for indirect connection for internet of things appplications in 3gpp network
CN108696822A (zh) * 2017-03-17 2018-10-23 华为技术有限公司 一种发起用户面路径重建的方法、装置及通信系统
CN108881356A (zh) * 2017-05-11 2018-11-23 华为技术有限公司 缓存数据的方法和会话管理功能实体

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10375564B2 (en) * 2015-01-14 2019-08-06 Lg Electronics Inc. Method for updating area in wireless communication system, and device therefor
CN113473567A (zh) * 2016-06-23 2021-10-01 北京三星通信技术研究有限公司 支持数据传输的方法和设备
CN108632915B (zh) * 2017-03-20 2022-07-15 中兴通讯股份有限公司 一种终端在4g和5g网络间移动的方法、装置和设备
KR102355607B1 (ko) * 2017-03-23 2022-01-26 삼성전자 주식회사 무선 통신 시스템에서 단말의 위치에 따라서 세션의 상태를 관리하는 방법 및 장치
CN110771251B (zh) * 2017-06-16 2023-09-22 艾普拉控股有限公司 作为通信网络中的服务的小数据传送、数据缓冲及数据管理

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018067956A1 (en) * 2016-10-06 2018-04-12 Convida Wireless, Llc Session management with relaying and charging for indirect connection for internet of things appplications in 3gpp network
CN108696822A (zh) * 2017-03-17 2018-10-23 华为技术有限公司 一种发起用户面路径重建的方法、装置及通信系统
CN108881356A (zh) * 2017-05-11 2018-11-23 华为技术有限公司 缓存数据的方法和会话管理功能实体

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3897036A4

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022074115A (ja) * 2020-10-30 2022-05-17 宏碁股▲分▼有限公司 モビリティを処理する装置及び方法

Also Published As

Publication number Publication date
EP3897036A1 (en) 2021-10-20
US20210368408A1 (en) 2021-11-25
CN111328115A (zh) 2020-06-23
JP7206390B2 (ja) 2023-01-17
CN111328115B (zh) 2022-03-11
JP2022512444A (ja) 2022-02-03
EP4221360A1 (en) 2023-08-02
US11405834B2 (en) 2022-08-02
KR102505630B1 (ko) 2023-03-02
KR20210101303A (ko) 2021-08-18
EP3897036B1 (en) 2023-08-02
EP3897036A4 (en) 2022-01-26

Similar Documents

Publication Publication Date Title
WO2019157961A1 (zh) 通信方法及装置
WO2019184651A1 (zh) 一种通信方法及装置
WO2011000318A1 (zh) 切换控制的方法和设备
AU2019250861A1 (en) Data Transmission Method and Apparatus
WO2018112897A1 (zh) 一种会话激活方法及装置和系统
US10945180B2 (en) Mobility management method, apparatus, and system
WO2019129115A1 (zh) 一种系统切换的方法及通信实体
WO2018006250A1 (zh) 覆盖增强ce功能的实现方法及设备
WO2013091665A1 (en) Ue wireless capability change indication
WO2020119404A1 (zh) 一种数据发送方法及设备
WO2020034802A1 (zh) 一种激活pdu会话的方法及设备
WO2020155906A1 (zh) 一种通信系统切换方法、网络侧设备、装置和介质
WO2021062727A1 (zh) 一种重定向方法及装置、终端设备、网络设备
WO2010127580A1 (zh) 一种本地ip访问的寻呼方法及相关装置
WO2020024865A1 (zh) 一种会话对应关系的管理方法和终端设备
WO2018010127A1 (zh) 无线通信的方法、装置、接入网实体和终端设备
WO2010108355A1 (zh) 注册处理方法和接入处理方法
WO2020098760A1 (zh) 消息发送及其控制方法及装置
WO2021088007A1 (zh) 无线通信的方法、终端设备和网络设备
WO2020223907A1 (zh) 一种信息传输方法及装置、网络设备
WO2018006359A1 (zh) 一种本地网关之间建立隧道的方法及网关
WO2017004805A1 (zh) 数据传输的方法和设备
WO2021147672A1 (zh) 会话处理方法及通信装置
WO2022147836A1 (zh) 一种连接建立方法及装置、网络设备
WO2012068935A1 (zh) 网关重定位方法和源分流网关

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19896235

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021534129

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20217022006

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2019896235

Country of ref document: EP

Effective date: 20210714