WO2018081994A1 - 发送结束标记的方法、设备和系统 - Google Patents

发送结束标记的方法、设备和系统 Download PDF

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Publication number
WO2018081994A1
WO2018081994A1 PCT/CN2016/104486 CN2016104486W WO2018081994A1 WO 2018081994 A1 WO2018081994 A1 WO 2018081994A1 CN 2016104486 W CN2016104486 W CN 2016104486W WO 2018081994 A1 WO2018081994 A1 WO 2018081994A1
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WIPO (PCT)
Prior art keywords
source
path
target
drb
information
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PCT/CN2016/104486
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English (en)
French (fr)
Inventor
朱强华
熊春山
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2016/104486 priority Critical patent/WO2018081994A1/zh
Priority to EP20197507.5A priority patent/EP3826362B1/en
Priority to JP2019523654A priority patent/JP6740474B2/ja
Priority to CN202010927706.8A priority patent/CN112261695B/zh
Priority to CN201680090041.1A priority patent/CN109983803B/zh
Priority to EP16920732.1A priority patent/EP3534646B1/en
Priority to CN202010929068.3A priority patent/CN112261696A/zh
Publication of WO2018081994A1 publication Critical patent/WO2018081994A1/zh
Priority to US16/404,154 priority patent/US10986557B2/en
Priority to US17/234,285 priority patent/US11818645B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—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
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
    • 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
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • 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
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile communication system, and more particularly to a method, device and system for transmitting an end marker.
  • NextGen(NG) is the short name of the next generation mobile communication system architecture.
  • the user equipment (UE), the access node (AN), the core network (CN), and the data network may be specifically used.
  • (data network) constitutes.
  • CN can be logically divided into two parts: user plane and control plane.
  • the control plane is responsible for the management of the mobile network
  • the user plane is responsible for the transmission of service data.
  • NG2 is a transmission path between the control planes of the AN and the CN
  • NG3 is a transmission path between the user planes of the AN and the CN
  • NG6 is a transmission path between the user plane of the CN and the data network.
  • the entrance of the mobile user to the network which can provide basic computing power, storage capability, display the business window to the user, and accept user input.
  • the NG UE will adopt the next-generation air interface technology to establish a signal connection and data connection with the AN to transmit control signals and service data to the mobile network.
  • AN Similar to the base station in the traditional network (for example, 2G to 4G), it is deployed close to the UE, provides the network access function for authorized users in a specific area, and can use different quality transmission according to the user level, service demand, etc.
  • the tunnel transmits user data.
  • the AN can manage its own resources, provide access services for the UE as needed, and forward control signals and user data between the UE and the core network.
  • CN Responsible for maintaining the subscription data of the mobile network, managing the network elements of the mobile network, providing functions such as session management, mobility management, policy management, and security authentication for the UE.
  • the UE When the UE is attached, the UE is provided with network access authentication; when the UE has a service request, the network resource is allocated to the UE; when the UE moves, the network resource is updated for the UE; when the UE is idle, the UE is provided with a fast recovery mechanism;
  • the UE is detached, the network resource is released for the UE; when the UE has the service data, the data routing function is provided for the UE, such as forwarding the uplink data to the data network; or receiving the UE from the data network.
  • the row data is forwarded to the AN for transmission to the UE.
  • Data network Provides service services for the UE. It can be a private network, such as a local area network. It can also be an external network that is not controlled by the operator, such as the Internet, or a proprietary network deployed by the operators.
  • the data path consists of an NG3 path and an air interface path.
  • the NG3 path may be based on a node (for example, an AN), a UE, a session, a stream, or the like.
  • a node for example, an AN
  • a UE corresponds to one NG3 path
  • each session corresponds to one NG3 path
  • each AN corresponds to An NG3 path
  • an air interface path may be composed of one or more data radio bears (DRBs).
  • DRBs data radio bears
  • the core network cannot generate a DRB-based end tag, where the DRB-based end tag is used to assist the target AN to downlink on the target DRB.
  • the data is sorted. Therefore, in the process of the UE switching from the source AN to the target AN, the core network cannot send the DRB-based end tag to the target AN, thereby causing the problem of downlink data disorder caused by the UE handover.
  • the embodiment of the invention provides a method, a device and a system for transmitting an end tag, which can accurately obtain a DRB-based end tag when the DRB on the air interface path is invisible to the core network.
  • a method for sending an end tag comprising: receiving, by a source AN, a first one sent by the core network user plane device by using a source NG3 path between the source AN and a core network user plane device An end tag, where the first end tag is used to indicate that the downlink data of the UE is sent on the source NG3 path; and the source AN generates N second end tags according to the first end tag, where the N is a number of source DRBs corresponding to the source NG3 path; the source AN sends the N second end tags to the target AN by using the forwarding path, where the forwarding path is used by the source AN to pass the source The data of the UE received by the NG3 path is forwarded to the target AN.
  • the source AN receives the first part sent by the core network user plane device by using a source NG3 path between the source AN and a core network user plane device.
  • the method further includes: the source AN sending a first handover request message to the target AN, where the first handover request message carries source data radio bearer DRB information of the UE and the source NG3
  • the information of the path, where the source DRB information of the UE includes: quality of service QoS information of the source DRB, an identifier ID of the source DRB, and a data category indicator of the source DRB;
  • the information includes: an IP address and a tunnel ID of the source NG3 path on the source AN, and an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the method further includes: the source AN receiving a first handover confirmation message of the target AN, the first handover The acknowledgment message carries the IP address and tunnel ID of the forwarding path on the target AN.
  • the source AN is received by the source network NG3 path between the source AN and the core network user plane device Before the end of the marking, the method further includes: the source AN sending a second handover request message to the core network control plane device, where the second handover request message carries the number of the forwarding path and the first container,
  • the first container includes source DRB information of the UE and information of the source NG3 path, where the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB, and the source a data class indicator of the DRB;
  • the information of the source NG3 path includes: an IP address and a tunnel ID of the source NG3 path on the source AN, and the source NG3 path is on the core network user plane device IP address and tunnel ID.
  • the method further includes: the source AN receiving a handover command sent by the core network control plane device, the handover command Carrying an IP address and a tunnel ID of the forwarding path on the core network user plane device.
  • the source AN generates N second end tags according to the first end tag, including : the source AN according to the correspondence between the forwarding path and the source NG3 path and the first An end marker, generating the N second end markers; or, the source AN according to the forwarding path, a correspondence between the ID of the UE and the source NG3 path, and the first Ending the flag, generating the N second end tags, where the first end tag carries an ID of the UE.
  • a method for transmitting an end tag comprising: receiving, by a target access node AN, a second end tag sent by a source AN by using a forwarding path, where the forwarding path is used by the source AN to pass a source
  • the data of the user equipment UE received by the next-generation NG3 path is forwarded to the target AN, and the forwarding path is in one-to-one correspondence with the source NG3 path; the target AN generates M third ends according to the second end marker.
  • the M is a number of target DRBs corresponding to the forwarding path, and the third end tag is used to sequence the downlink data of the UE on the target DRB corresponding to the third end tag.
  • the target AN generates M third end tags according to the second end tag, including: the target AN according to the forwarding path Generating the M third end tags according to the correspondence between the target DRBs and the second end tag; or the target AN according to the forwarding path, the identifier ID of the user equipment UE, and the target
  • the correspondence between the three DRBs and the second end tag generates the M third end tags, where the second end tag carries the ID of the UE.
  • the method further The method includes: the target AN receives a first handover request message sent by the source AN, where the first handover request message carries source DRB information of the UE and information of the source NG3 path; Source DRB information, establishing the target DRB; the target AN establishes a target NG3 path according to the information of the source NG3 path; the target AN allocates resources for the forwarding path; wherein the source DRB information of the UE includes The quality of service QoS information of the source DRB, the ID of the source DRB, and the data category indicator of the source DRB; the information of the source NG3 path includes: the source NG3 path is on the source AN An IP address and a tunnel ID, and an IP address and a tunnel ID of the source NG3 path on the core network user plane
  • the method further includes: the target AN sending a first path switching request message to a core network control plane device, where A path switch request message is used to request to switch the NG3 path, where the first path switch request message carries the ID of the source NG3 path and the information of the target NG3 path, and the information of the target NG3 path includes the target NG3 path The IP address and tunnel ID on the target AN.
  • the first path switching request message further carries a data category indicator list of the target NG3 path.
  • the method further includes: the target AN receiving the core network control a third handover request message sent by the device, where the third handover request message carries a first container, where the first container includes source DRB information of the UE and information of the source NG3 path; Deriving the source DRB information, establishing the target DRB; the target AN establishing a target NG3 path according to the information of the source NG3 path; the target AN allocates resources for the forwarding path according to the third handover request message; The target AN sends a second handover confirmation message to the core network control plane device, where the second handover confirmation message carries forwarding path information of the target AN, where the source DRB information of the UE includes: the source The QoS information of the DRB, the ID of the source DRB, and the data category indicator of the source DRB; the information of the source
  • the method further includes: the target AN sending a second path switching request message to the core network control plane device, where The second path switch request message is used to request to switch the NG3 path; wherein the second path switch request message carries the ID of the source NG3 path, the information of the target NG3 path and the NG2 connection identifier, and the information of the target NG3 path And including an IP address and a tunnel ID of the target NG3 path on the target AN, where the NG2 connection identifier is used to indicate that the UE handover is complete.
  • a source AN including: a receiving unit, configured to pass the source AN and a core
  • the source NG3 path between the core network user plane devices receives the first end tag sent by the core network user plane device, where the first end tag is used to indicate that the downlink data of the UE is sent on the source NG3 path; a unit, configured to generate, according to the first end tag received by the receiving unit, N second end tags, where N is a number of source DRBs corresponding to the source NG3 path, and a sending unit is configured to pass the Transmitting the second end flag generated by the generating unit to the target AN, where the forwarding path is used by the source AN to forward data of the UE received through the source NG3 path to the target AN .
  • the sending unit is further configured to: receive the core network user plane by using a source NG3 path between the source AN and a core network user plane device Before the first end tag sent by the device, sending, by the device, a first handover request message, where the first handover request message carries source DRB information of the UE and information of the source NG3 path, where the UE
  • the source DRB information includes: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path includes: the source NG3 path is at the source IP address and tunnel ID on the AN, the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the sending unit is further configured to: receive the core network user plane by using a source NG3 path between the source AN and a core network user plane device Before the first end tag sent by the device, send a second handover request message to the core network control plane device, where the second handover request message carries the number of the forwarding path and the first container, where the first container includes the Source DRB information of the UE and information of the source NG3 path; where the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB
  • the information of the source NG3 path includes: an IP address and a tunnel ID of the source NG3 path on the source AN, and an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the number of the forwarding paths is N
  • the generating unit is specifically configured to: according to the forwarding path Generating the N second end tags with the correspondence between the source NG3 path and the first end tag; or, according to the forwarding path, the ID of the UE and the source NG3 path
  • the corresponding relationship between the three, and the first end tag generates the N second end tags, where the first end tag carries an ID of the UE.
  • the fourth aspect provides a target AN, including: a receiving unit, configured to receive a second end tag sent by the source AN, where the forwarding path is used by the source device to receive data of the user equipment UE that is received by the source NG3 path. Forwarding to the target AN, the forwarding path is in one-to-one correspondence with the source NG3 path; the generating unit is configured to generate M third end tags according to the second end tag received by the receiving unit, M is the number of target DRBs corresponding to the forwarding path, and the third end marker is used to perform downlink data ordering of the UE on the target DRB corresponding to the third end marker.
  • the generating unit is specifically configured to: according to a correspondence between the forwarding path and the target DRB, and the second end tag, Generating the M third end tags; or generating the M according to the forwarding path, the correspondence between the identifier ID of the user equipment UE and the target DRB, and the second end marker a third end tag, the second end tag carrying an ID of the UE.
  • the second implementation manner of the fourth aspect further includes: a first processing unit, where the receiving unit is further configured to receive the source AN through the forwarding path Before receiving the second end tag, receiving a first handover request message sent by the source AN, where the first handover request message carries source DRB information of the UE and information of the source NG3 path; the first process a unit, configured to establish the target DRB according to the source DRB information, establish a target NG3 path according to the information of the source NG3 path, and allocate a resource for the forwarding path, where the source DRB information of the UE includes The quality of service QoS information of the source DRB, the ID of the source DRB, and the data category indicator of the source DRB; the information of the source NG3 path includes: the source NG3 path is on the source AN An IP address and a tunnel ID, and an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the sending unit is further configured to: send a first path switching request message to the core network control plane device, where the first path switching request message is used to request to switch the NG3 path, where the first path switching request message carries the source NG3 path Information of the ID and the target NG3 path, the information of the target NG3 path including an IP address and a tunnel ID of the target NG3 path on the target AN.
  • the first path switching request message further carries a data category indicator list of the target NG3 path.
  • the method further includes: a second processing unit, where the receiving unit is further configured to receive the source AN by using a forwarding path Before receiving the second end tag, receiving a third handover request message sent by the core network control plane device, where the third handover request message carries a first container, where the first container includes source DRB information of the UE and the Information of the source NG3 path, the second processing unit, configured to establish the target DRB according to the source DRB information, establish a target NG3 path according to the information of the source NG3 path, and according to the third handover request a message, the resource is allocated to the forwarding path; the sending unit is further configured to send a second handover confirmation message to the control device of the core network, where the second handover confirmation message carries forwarding path information of the target AN;
  • the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB,
  • a fifth aspect provides a method for sending an end tag, where the method includes: a core network user plane device receives a modified tunnel request message sent by a core network control plane device, where the modified tunnel request message carries a source next generation NG3 path.
  • the transmission path between the target NG3 path includes an IP address and a tunnel ID of the target NG3 path on the target AN; the core network user plane device implements the NG3 path according to the modified tunnel request message Switching; the core network user plane device generates a first end tag, and sends the first end label to the source AN through the source NG3 path
  • the first end flag is used to indicate that the downlink data of the user equipment UE is sent on the source NG3 path.
  • the core network user plane device generates a first end tag, including: the core network user plane device generates the identifier according to the ID of the source NG3 path a first end tag, the number of the first end tag being the same as the number of the source NG3 path; or the core network user plane device generating the data type indicator list according to the target NG3 path a first end tag, the number of the first end tag being the same as the number of data class indicators included in the data category indicator list; or the core network user plane device according to the ID and location of the UE
  • the first end tag is generated by the ID of the source NG3 path, and the first end tag carries the ID of the UE, and the number of the first end tag is the same as the number of the source NG3 path.
  • the modified tunnel request message further carries the data category indicator list of the target NG3 path, or The ID of the UE.
  • a method for sending an end tag comprising: receiving, by a core network control plane device, a path switch request message sent by a target access node AN, where the path switch request message is used to request to switch to a next generation NG3 a path, where the path switch request message carries the identifier ID of the source NG3 path and the information of the target NG3 path, where the information of the target NG3 path includes an IP address and a tunnel ID of the target NG3 path on the target AN;
  • the core network control plane device generates a first end tag, where the first end tag is used to indicate that downlink data of the user equipment UE is sent on the source NG3 path; and the core network control plane device sends the downlink network control plane device to the core network user plane device.
  • the tunnel request message is modified, and the modified tunnel request message carries an ID of the source NG3 path, information of the target NG3 path, and the first end tag.
  • the core network control plane device generates a first end tag, including: the core network control plane device generates the identifier according to an ID of the source NG3 path a first end tag, the number of the first end tag being the same as the number of the source NG3 path; or the core network control plane device according to the data category indicator list of the target NG3 path, Generating the first end tag, the number of the first end tag being the same as the number of data class indicators included in the data category indicator list; or the core network control plane device according to the UE ID and the ID of the source NG3 path, the first end tag is generated, the first end tag carries an ID of the UE, and the number of the first end tag is the same as the number of the source NG3 path .
  • the path switching request message further carries an NG2 connection identifier, where the NG2 connection identifier is used to indicate that the UE handover is complete; or
  • the path switch request further carries a data category indicator list of the target NG3 path, and the modified tunnel request message further carries a data category indicator list of the target NG3 path.
  • the method before the core network control plane device receives the path switching request message sent by the target AN, the method further includes The core network control plane device receives a second handover request message sent by the source AN, where the second handover request message carries the number of the forwarding path and the first container, where the first container includes The source DRB information of the UE and the information of the source NG3 path; the core network control plane device allocates resources for the forwarding path according to the number of the forwarding paths; and the core network control plane device targets the target The AN sends a third handover request, where the third handover request carries the first container;
  • the core network control plane device receives a second handover confirmation message sent by the target AN, and the second handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the first end tag sent by the core network user plane device is received through the source NG3 path, and the second end tag based on the DRB is generated according to the first end tag, and passed
  • the forwarding path is sent to the target AN to assist the downlink data sorting of the UE on the target DRB, and solves the problem that the core network cannot accurately transmit the DRB-based end marker to the target AN when the DRB is invisible, thereby avoiding the UE handover.
  • Downstream data is out of order.
  • the second end tag sent by the source AN is received by the forwarding path, and the third end tag based on the target DRB is generated according to the second end tag to be on the target DRB.
  • Auxiliary UE downlink data sequencing solving the core network in DRB In the case of invisibility, the problem that the DRB-based end marker is not accurately transmitted to the target AN cannot be accurately transmitted, thereby avoiding the downlink data disorder caused by the UE handover.
  • Figure 1 is a structural diagram of a next generation mobile communication system
  • FIG. 2 is a flowchart of a method for sending end marking according to an embodiment of the present invention
  • FIG. 3 is a flowchart of another method for sending end marking according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of another method for sending end marking according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of still another method for sending end marking according to an embodiment of the present invention.
  • FIG. 6 is a signaling interaction diagram of a method for sending end marking according to an embodiment of the present invention.
  • FIG. 6 is a signaling interaction diagram of another method for sending end marking according to an embodiment of the present invention.
  • FIG. 7 is a signaling interaction diagram of still another method for sending end marking according to an embodiment of the present invention.
  • FIG. 7a is a signaling interaction diagram of still another method for sending end marking according to an embodiment of the present invention.
  • FIG. 8 is a structural diagram of a source AN according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of a target AN according to an embodiment of the present invention.
  • FIG. 10 is a structural diagram of a core network control plane device according to an embodiment of the present invention.
  • FIG. 11 is a structural diagram of a core network user plane device according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a hardware of a source AN according to an embodiment of the present disclosure.
  • FIG. 13 is a hardware structural diagram of a target AN according to an embodiment of the present invention.
  • FIG. 14 is a hardware structural diagram of a core network control plane device according to an embodiment of the present disclosure.
  • FIG. 15 is a hardware structural diagram of a core network user plane device according to an embodiment of the present invention.
  • the core network user plane device and the core network control plane device mentioned in the embodiments of the present invention may be integrated on the same core network device, or may be distributed on two independent core network devices. It can also be two different network functional entities on the data center or server.
  • the core network user plane device is used to implement the data routing function of the CN shown in FIG. 1
  • the core network control plane device is used to implement the management function of the CN mobile network shown in FIG. 1 , for example, the subscription data of the mobile network, and the management mobile
  • the network element of the network provides functions such as session management, mobility management, policy management, and security authentication for the UE.
  • the source AN refers to an AN that provides services for the UE before the UE handover
  • the target AN refers to an AN that provides services for the UE after the UE handover
  • the source DRB refers to the air interface transmission path between the source AN and the UE
  • the target DRB refers to the air interface transmission path between the target AN and the UE
  • the source NG3 path refers to the source AN and the core network user plane device.
  • the NG3 path is used to transmit the downlink data of the UE.
  • the target NG3 path refers to an NG3 path between the target AN and the core network user plane device for transmitting downlink data of the UE.
  • the source NG3 path or the target NG3 path mentioned in the embodiments of the present invention may be based on AN, UE, session, flow, etc., for example, when the source NG3 path is based on the UE, one UE Corresponding to a source NG3 path; or, when the source NG3 path is based on a session, one session corresponds to one NG3 path; or, when the source NG3 path is based on AN, one AN corresponds to one NG3 path.
  • the embodiments of the present invention are described by taking the case that the source NG3 path is one as an example, and the implementation method for the multiple source NG3 paths is similar, and belongs to the protection scope of the present invention.
  • an embodiment of the present invention provides a method for sending an end tag, which is specifically described below.
  • the source AN receives the first end tag sent by the core network user plane device by using the source NG3 path between the source AN and the core network user plane device.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path; it may be a message that may carry the IP address of the active NG3 path and the tunnel ID.
  • the IP address and tunnel ID of the source NG3 path may include an IP address and a tunnel ID of the source NG3 path on the source AN, and/or an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the first end tag may be generated by a core network, for example, a core network user plane device or a core network control plane device.
  • the core network generates an ID according to the source NG3 path, that is, an ID of an NG3 path is generated.
  • An end tag, at this time, the first end tag is based on the end tag of the source NG3 path; however, since the DRB is not visible to the core network, the core network cannot generate an end tag based on the DRB.
  • a core network for example, a core network user plane device or a core network control plane device.
  • the core network generates an ID according to the source NG3 path, that is, an ID of an NG3 path is generated.
  • An end tag at this time, the first end tag is based on the end tag of the source NG3 path; however, since the DRB is not visible to the core network, the core network cannot generate an end tag based on the DRB.
  • the ID of the UE is used to identify the UE, and may be an International Mobile Subscriber Identity (IMSI), and a mobility management entity (M-temporary mobile subscriber identity, M-TMSI).
  • IMSI International Mobile Subscriber Identity
  • M-TMSI mobility management entity
  • GUI globally unique temporary identity
  • S-TMSI SAE-temporary mobile subscriber identity
  • the source AN generates N second end tags according to the first end tag.
  • N is the number of source DRBs corresponding to the source NG3 path.
  • N may be an integer greater than or equal to 2.
  • the second end tag may carry the IP address of the forwarding path and the tunnel ID, where the IP address and tunnel ID of the forwarding path may include the IP address and tunnel ID of the forwarding path on the source AN, and/or the forwarding path is IP address and tunnel ID on the target AN.
  • the source NG3 path and the source DRB may have a preset correspondence, and the corresponding relationship may be stored on the source AN. For example, if the handover does not occur, the source AN receives the downlink data sent on the source NG3 path. The source DRB corresponding to the source NG3 path is sent to the UE. The source AN receives the uplink data received by the source DRB and sends the data to the core network through the source NG3 path corresponding to the source DRB. Specifically, the source DRB corresponding to the source NG3 path may include one or more source DRBs.
  • the source AN sends N second end tags to the forwarding path corresponding to the source NG3 path.
  • Target AN sends N second end tags to the forwarding path corresponding to the source NG3 path.
  • the forwarding path corresponding to the source NG3 path refers to a forwarding path for transmitting downlink data of the UE on the source NG3 path.
  • one source NG3 path may correspond to one or more forwarding paths, and the one or more forwarding paths are used to transmit downlink data of UEs transmitted on the source NG3 path, as follows:
  • the source NG3 path corresponds to a forwarding path, it indicates that downlink data of the UE transmitted on the source NG3 path can be sent to the target AN through the one forwarding path;
  • the source NG3 path corresponds to multiple forwarding paths, it indicates that the downlink data of the UE transmitted on the source NG3 path can be sent to the target AN through multiple forwarding paths.
  • the forwarding path is used by the source AN to forward data of the UE received through the source NG3 path to the target AN.
  • the forwarding path is a transmission channel between the source AN and the target AN, and may be a direct transmission channel or an indirect transmission channel.
  • the direct transmission channel refers to that the source AN and the target AN can communicate directly, and does not need to be forwarded by a third-party device;
  • the indirect transmission channel refers to that the source AN and the target AN cannot directly communicate with each other, and the third-party device needs to be used.
  • the third party device can be a core network user plane device.
  • the number of the forwarding paths is N, that is, the number of forwarding paths is the same as the number of source DRBs.
  • the forwarding path is based on the source DRB.
  • Manner 1 The source AN generates the N second end tags according to the correspondence between the forwarding path and the source NG3 path and the first end tag.
  • the mapping between the forwarding path and the source NG3 path may be a correspondence between the ID of the forwarding path and the ID of the source NG3 path, and may be preset in a form of a list.
  • Source AN may be a correspondence between the ID of the forwarding path and the ID of the source NG3 path, and may be preset in a form of a list.
  • the ID of the forwarding path may be the IP address of the forwarding path and the tunnel ID;
  • the ID of the source NG3 path may be the IP address of the source NG3 path and the tunnel ID.
  • IP address of the forwarding path and the tunnel ID refer to the related description in step 202.
  • IP address and the tunnel ID of the source NG3 path refer to the related description in step 201, and details are not described herein.
  • the source AN may obtain an ID of the source NG3 path that transmits the first end tag, and use the obtained ID of the source NG3 path to find the ID of the forwarding path and the path of the source NG3.
  • the ID of the forwarding path corresponding to the source NG3 path is obtained, and the second end tag corresponding to the forwarding path is generated according to the obtained ID of the forwarding path, and is sent to the target AN through the forwarding path.
  • the foregoing mode 1 may be applied to a scenario in which the first end tag is based on an end tag of the source NG3 path, in which the source AN generates a second end based on the source DRB or the target DRB according to the first end tag based on the source NG3 path. Marked and sent to the target AN to assist the target AN in sorting the downlink data on the target DRB, avoiding the core network unable to generate and send the DRB-based end marker to the target DR caused by the target AN when the DRB is invisible The problem of line data out of order.
  • the source AN In the second mode, the source AN generates the N second end tags according to the forwarding path, the correspondence between the ID of the UE and the source NG3 path, and the first end tag.
  • the first end tag carries the ID of the UE.
  • the source AN is configured according to the forwarding path, and the correspondence between the ID of the UE and the source NG3 path may be the ID of the forwarding path, the ID of the source NG3 path, and the correspondence between the IDs of the UE. relationship.
  • the ID of the forwarding path and the ID of the source NG3 path can be referred to in the related description in the first method, and details are not described herein.
  • the source AN may obtain an ID of the source NG3 path that transmits the first end tag and an ID of the UE; according to the obtained ID of the source NG3 path and the ID of the UE, the foregoing may be searched for Corresponding relationship, obtaining an ID of a forwarding path corresponding to the source NG3 path of the UE; generating a second end tag corresponding to the forwarding path according to the obtained ID of the forwarding path, and transmitting the second end tag to the target AN through the forwarding path.
  • the foregoing mode 2 may be applied to a scenario in which the source NG3 path is an AN-based path.
  • multiple UEs may share one source NG3 path, in order to identify the end tag of the transmission on the source NG3 path.
  • the UE, the first end marker may be generated according to the ID of the UE and the information of the source NG3 path.
  • the source AN generates the UE based on the UE according to the first end marker.
  • the second end tag of the source DRB or the target DRB avoids the problem that the core network cannot generate and send the DRB-based end tag to the target AN caused by the DRB in the case that the DRB is invisible.
  • the second end flag is based on the source DRB. Since the source DRB and the target DRB are in one-to-one correspondence, the generated N second end tags are also based on the target DRB.
  • the number of the forwarding paths is 1, that is, the forwarding path is based on the source NG3 path, that is, one source NG3 path corresponds to one forwarding path.
  • the i-th second end tag of the N second end tags generated in the foregoing step 202 carries a data class indicator of the xth source DRB in the source DRB corresponding to the source NG3 path, 1 ⁇ i ⁇ N, 1 ⁇ x ⁇ N
  • the jth second end tag of the N second end tags carries a data class indicator of the yth source DRB of the source DRB corresponding to the source NG3 path, 1 ⁇ j ⁇ N, 1 ⁇ y ⁇ N, where i, j, x and y are integers, and i is not equal to j, and x is not equal to y.
  • the second end tag is in one-to-one correspondence with the source DRB, and the second end tag carries a data category indicator of its corresponding source DRB
  • the first second end marker may carry the data category indicator of the first source DRB; the second second end marker may carry the data category indicator of the second source DRB; the third The second end tag may carry a data class indicator of the third source DRB.
  • the step 203 specifically includes: the source AN transmitting the generated N second end tags by using the one forwarding path.
  • the N second end tags respectively carry data class indicators of different source DRBs, that is, the N second end tags are based on the source DRB, and further, the source DRBs are in one-to-one correspondence with the target DRBs. Therefore, the foregoing generation
  • the N second end markers are also based on the target DRB.
  • the source AN receives the first end tag sent by the user plane device of the core network through the source NG3 path, and the source AN generates the base according to the first end tag.
  • the second end tag of the DRB is sent to the target AN through the forwarding path corresponding to the DRB, thereby solving the problem that the core network cannot accurately transmit the DRB-based end tag to the target AN when the DRB is invisible to the core network.
  • the downlink data disorder caused by the UE handover is avoided.
  • the method further includes:
  • the source AN sends a first handover request message to the target AN, where the first handover request message carries source DRB information of the UE and information of the source NG3 path.
  • the source DRB information of the UE may include: quality of service (QoS) information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • QoS quality of service
  • the information about the source NG3 path may include: an IP address and a tunnel ID of the source NG3 path on the source AN, and an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the data category indicator is used to indicate a data category that is allowed to be transmitted on the source DRB, and can be used to determine QoS information of the DRB. Specifically, the data category may be classified according to the user's subscription data, the operator's policy, the charging policy, or the attributes of the service.
  • the data category indicator can be a flow identification indicator (FII), a QoS class identifier (QCI), or a differentiated services code point (DSCP).
  • FII flow identification indicator
  • QCI QoS class identifier
  • DSCP differentiated services code point
  • the source AN sends a first handover request message to the target AN, and the target AN establishes a forwarding path, a target DRB, and a target NG3 path according to the first handover request message.
  • the foregoing method may further include:
  • the source AN sends a second handover request message to the core network control plane device, where the second handover request message carries the number of the forwarding path and the first container, where the first container includes the source of the UE DRB information and information of the source NG3 path.
  • the source DRB information may include: QoS information of the source DRB, where the source DRB An identifier (ID), and a data category indicator of the source DRB; the information of the source NG3 path may include: an IP address and a tunnel ID of the source NG3 path on the source AN, the source NG3 The IP address and tunnel ID of the path on the core network user plane device.
  • step 200a For details, refer to the related description in step 200a, and details are not described herein again.
  • the foregoing method may further include: combining the foregoing first implementation scenario or the second implementation scenario:
  • the source AN receives a handover command sent by the control device of the core network, where the handover command carries an IP address and a tunnel ID of the forwarding path on the user plane device of the core network.
  • the source AN sends a second handover request message carrying the first container to the core network control plane device, and the core network control plane device forwards the first container to the target AN, so that the target AN can be configured according to the A container establishes a forwarding path, a target DRB, and a target NG3 path.
  • the core network control plane device may also allocate resources for the forwarding path on the core network user plane device according to the second handover request.
  • an embodiment of the present invention provides another method for sending an end tag, which is specifically described below.
  • the target AN receives the second end tag sent by the source AN by using a forwarding path.
  • the forwarding path is used by the source AN to forward data of the UE received through the source NG3 path to the target AN, and the forwarding path is in one-to-one correspondence with the source NG3 path.
  • the forwarding path is in one-to-one correspondence with the source NG3 path.
  • the forwarding path is based on the source NG3 path, that is, one source NG3 path corresponds to one forwarding path, and the forwarding path is used to transmit the UE received on the corresponding source NG3 path. Downstream data.
  • the second end flag may be generated by the source AN modifying only the path related information in the first end tag, for example, replacing the IP address and the tunnel ID of the source NG3 path in the first end tag with the forwarding path.
  • the IP address and the tunnel ID therefore, a first end tag corresponding to generate a second end tag.
  • the first end tag, the IP address of the source NG3 path and the tunnel ID and the IP address of the forwarding path refer to related descriptions in steps 201-202, and details are not described herein.
  • the target AN generates M third end tags according to the second end tag.
  • the M is the number of the target DRBs corresponding to the forwarding path
  • the third end marker is used to sequence the downlink data of the UE on the target DRB corresponding to the third end marker.
  • a target DRB has a third end flag with the target DRB, and is used to assist the downlink data ordering of the UE on the target DRB corresponding to the third end tag when the target AN processes the third end tag. It can be seen that the third end marker is based on the end marker of the target DRB.
  • the M may be 1, that is, the number of the target DRBs corresponding to the forwarding path is 1.
  • one forwarding path corresponds to one target DRB; M may also be an integer greater than or equal to 2, that is, the target DRB corresponding to the forwarding path. The number is greater than or equal to 2, and at this time, one forwarding path corresponds to M target DRBs.
  • step 302 can be implemented in the following two manners:
  • Manner 1 The target AN generates the M third end tags according to the correspondence between the forwarding path and the target DRB and the second end tag.
  • the correspondence between the forwarding path and the target DRB may be a correspondence between the ID of the forwarding path and the ID of the target DRB, and may be preset in the target AN in the form of a list. Inside.
  • the ID of the forwarding path may be the IP address of the forwarding path and the tunnel ID; the ID of the target DRB is used to identify the DRB.
  • IP address and the tunnel ID of the forwarding path For a description of the IP address and the tunnel ID of the forwarding path, refer to the related description in step 202, and details are not described herein.
  • the target AN may obtain an ID of a forwarding path that transmits the second end tag, and use the obtained ID of the forwarding path to search for an ID of the forwarding path and an ID of the target DRB.
  • an ID of the target DRB corresponding to the forwarding path may be obtained; a third end tag corresponding to the target DRB is generated according to the obtained ID of the target DRB, or a third end tag corresponding to the obtained ID of the target DRB is generated.
  • the above manner 1 can be applied to the field where the second end marker is based on the end marker of the source NG3 path.
  • the target AN According to the second end tag based on the source NG3 path, the target AN generates a third end tag based on the target DRB, which prevents the core network from generating and transmitting the DRB-based end tag to the target AN when the DRB is invisible.
  • the problem of the target DRB up and down data out of order.
  • the target AN In the second mode, the target AN generates the M third end tags according to the forwarding path, the correspondence between the ID of the UE and the target DRB, and the second end tag.
  • the second end tag carries the ID of the UE.
  • the target AN may be the mapping between the ID of the UE and the target DRB according to the forwarding path, and may be a correspondence between the ID of the forwarding path, the ID of the target DRB, and the ID of the UE.
  • ID of the forwarding path refer to the related description in the first method for the ID of the target DRB.
  • the target AN may obtain an ID of the forwarding path that transmits the second end tag and an ID of the UE; and according to the obtained ID of the forwarding path and the ID of the UE, the corresponding relationship may be searched for.
  • the foregoing mode 2 is applied to the scenario where the source NG3 path is an AN-based path.
  • multiple UEs may share one source NG3 path, in order to identify the end tag transmitted on the source NG3 path.
  • the UE, the first end marker may be generated according to the ID of the UE and the information of the source NG3 path.
  • the target AN generates a third end tag based on the target DRB according to the second end tag, which avoids the target that the core network cannot generate and send the DRB-based end tag to the target AN when the DRB is invisible.
  • the problem of out-of-order data out of DRB is applied to the scenario where the source NG3 path is an AN-based path.
  • the target AN receives the second end tag sent by the source AN through the forwarding path, and the target AN generates a third end tag based on the target DRB according to the second end tag, and solves the core network in the DRB.
  • the DRB-based end marker cannot be accurately sent to the target AN, thereby avoiding the downlink data disorder caused by the UE handover.
  • the method further includes the steps 300a-300d, as follows. Said.
  • the target AN receives a first handover request message sent by the source AN, where the first handover request message carries source DRB information of the UE and information of the source NG3 path.
  • the source DRB information of the UE may include: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path may include: The IP address and tunnel ID of the source NG3 path on the source AN, and the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the target AN establishes the target DRB according to the source DRB information.
  • the target DRB is established according to the QoS information of the source DRB, for example, the rate, the packet loss rate, and the priority.
  • the step 300b belongs to the prior art and is not described again.
  • the source DRB and the target DRB may have a one-to-one correspondence.
  • the target AN establishes a target NG3 path according to the information of the source NG3 path.
  • the target AN allocates an IP address and a tunnel ID to the target NG3 path on the target AN, and the core network user plane device can send data to the target AN according to the allocated IP address and the tunnel ID, and the target AN is in the core according to the source NG3 path.
  • the IP address and tunnel ID of the network user plane device can send data to the core network user plane device, thereby establishing a target NG3 path.
  • the target AN allocates resources for the forwarding path.
  • the allocated resource may include a tunnel ID and an IP address of the forwarding path on the target AN, and the source AN may send data to the target AN by using the allocated resource.
  • the forwarding path is associated with the source NG3 path, and the target AN can allocate resources for the forwarding path corresponding to the source NG3 path according to the information of the source NG3 path carried in the first handover request message.
  • the above method may further include:
  • the target AN sends a first handover confirmation message to the source AN, where the first handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the above method may further include:
  • the target AN sends a first path switch request message to the core network control plane device, where the first path switch request message is used to request to switch the NG3 path; wherein the first path switch request message carries the ID of the source NG3 path and the Information about the target NG3 path.
  • the information of the target NG3 path may include the IP address and the tunnel ID of the target NG3 path on the target AN; the ID of the source NG3 path may specifically be the tunnel ID of the source NG3 path on the source AN, or may be The tunnel ID of the source NG3 path on the core network user plane device is not limited.
  • the first path switch request message may further carry a data category indicator list of the target NG3 path.
  • the data category indicator list includes at least one data category indicator for indicating a data category that is allowed to be transmitted on the target NG3 path.
  • the foregoing method further includes the step 300'a-300'e, as follows. Said.
  • the target AN receives a third handover request message sent by the control device of the core network, where the third handover request message carries a first container, where the first container includes source DRB information of the UE and the source NG3 Path information.
  • the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path includes: the source NG3
  • the target AN establishes the target DRB according to the source DRB information.
  • the target AN establishes a target NG3 path according to the information of the source NG3 path.
  • the target AN allocates resources for the forwarding path according to the third handover request message.
  • the allocated resource may include a tunnel ID and an IP address of the forwarding path on the target AN, and the core network user plane device may forward the data sent by the source AN to the target AN by using the allocated resource.
  • the target AN sends a second handover confirmation message to the core network control plane device, where the second handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the above method may further include:
  • the target AN sends a second path switch request message to the core network control plane device, where the second path switch request message is used to request to switch the NG3 path.
  • the second path switch request message may carry the ID of the source NG3 path, the information of the target NG3 path, and the NG2 connection identifier.
  • the ID of the source NG3 path may be related to the related description in 300e
  • the information of the target NG3 path may include an IP address and a tunnel ID of the target NG3 path on the target AN, where the NG2 connection identifier is used to indicate the UE The switch is complete.
  • the embodiment of the present invention provides another method for sending an end tag, which is specifically described below.
  • the core network user plane device receives the modified tunnel request message sent by the core network control plane device.
  • the modified tunnel request message carries the ID of the source NG3 path and the target NG3 path, where the source NG3 path is a transmission path between the source AN and the core network user plane device, and the target NG3 path is the target AN and The transmission path between the core network user plane devices, and the information of the target NG3 path includes an IP address and a tunnel ID of the target NG3 path on the target AN.
  • the core network user plane device implements the switching of the NG3 path according to the modified tunnel request message.
  • the core network user plane device modifies the IP address and tunnel ID of the source AN of the source NG3 path to be the tunnel ID of the IP address of the target AN.
  • the core network user plane device generates a first end tag, and sends the first end tag to the source AN by using the source NG3 path.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path.
  • the core network user plane device generates the first end tag, and the following implementation manner may be adopted:
  • the core network user plane device In a first mode, the core network user plane device generates the first end tag according to the ID of the source NG3 path, and the number of the first end tag is the same as the number of the source NG3 path.
  • the number of the source NG3 paths is determined according to the ID of the source NG3 path in the path switching request message; and then the corresponding number of first end tags are generated according to the determined number of source NG3 paths.
  • the ID of each NG3 path in the path switch request message generates a corresponding first end tag.
  • the first end tag may carry an IP address and a tunnel ID of the active NG3 path.
  • the second network user plane device generates the first end tag according to the data category indicator list of the target NG3 path, the number of the first end tag and the data category included in the data category indicator list.
  • the number of indicators is the same.
  • the first end tag may carry an IP address and a tunnel ID of the active NG3 path.
  • the core network user plane device generates a first end tag according to the data category indicator list of the target NG3 path and the ID of the source NG3 path.
  • the end tag is generated according to the data class indicator, so that the source AN or the target AN can find the DRB-based path according to the data class indicator carried in the received end tag and the ID of the path transmitting the end tag, for example, Forward the path or target DRB to generate a DRB-based end tag.
  • the third end of the core network user plane device generates the first end tag according to the ID of the UE and the ID of the source NG3 path, where the first end tag carries the ID of the UE, and the first end tag
  • the number of the same number is the same as the number of the source NG3 paths.
  • determining the source NG3 path according to the ID of the source NG3 path in the path switching request message And then generating a corresponding number of first end tags according to the determined number of source NG3 paths.
  • the first end tag may also carry an IP address and a tunnel ID of the active NG3 path.
  • the ID of the source NG3 path and the ID of the UE may be related to the description in step 201.
  • the IP address and tunnel ID of the source NG3 path may include the IP address and tunnel ID of the source NG3 path on the source AN. And/or the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the end tag is generated according to the ID of the UE and the ID of the source NG3 path, so that the source AN or the target AN can according to the ID of the UE carried in the received end tag and the path of the end tag.
  • the ID finds a corresponding DRB-based path, eg, a forwarding path or a target DRB, thereby generating a DRB-based end marker.
  • the modified tunnel request message may further carry the data category indicator list of the target NG3 path, or the ID of the UE.
  • the core network user plane device With the method for sending an end tag provided by the foregoing embodiment, the core network user plane device generates the first end tag in multiple manners, and sends the first end tag to the source AN, so that the source AN or the target AN can be more flexibly generated.
  • the DRB-based end tag further solves the problem that the core network cannot accurately transmit the DRB-based end tag to the target AN when the DRB is invisible, thereby avoiding the problem of downlink data disorder caused by the UE handover.
  • the embodiment of the present invention provides another method for sending an end tag, which is specifically described below.
  • the core network control plane device receives a path switch request message sent by the target AN.
  • the path switch request message is used to request to switch the NG3 path, where the path switch request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the information of the target NG3 path may include an IP address and a tunnel ID of the target NG3 path on the target AN.
  • ID of the source NG3 path refer to the related description in 300e, and details are not described herein.
  • the path switch request message further carries an NG2 connection identifier, where the NG2 connection identifier is used to indicate that the UE handover is complete; or the path switch request further carries the data class of the target NG3 path.
  • a list of indicator indicators, the modified tunnel request message also carries a list of data category indicators of the target NG3 path.
  • the core network control plane device generates a first end tag.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path.
  • step 502 can be implemented as follows:
  • the core network control plane device In a first manner, the core network control plane device generates the first end tag according to the ID of the source NG3 path, and the number of the first end tag is the same as the number of the source NG3 path.
  • the second network control plane device generates the first end tag according to the data category indicator list of the target NG3 path, the number of the first end tag and the data category included in the data category indicator list.
  • the number of indicators is the same.
  • the core network control plane device In a third mode, the core network control plane device generates the first end tag according to the ID of the UE and the ID of the source NG3 path, where the first end tag carries an ID of the UE, and the first end tag The number of the same number is the same as the number of the source NG3 paths.
  • first mode, the second mode, and the third mode in the foregoing step 502 can refer to the first mode, the second mode, and the third mode in the embodiment shown in FIG. 4, and details are not described herein again.
  • the core network control plane device sends a modify tunnel request message to the core network user plane device.
  • the modified tunnel request message carries the ID of the source NG3 path, the information of the target NG3 path, and the first end tag.
  • the information of the ID of the source NG3 path and the path of the target NG3 can be referred to the related description in the embodiment shown in FIG. 2.
  • the core network control plane device generates the first end tag in multiple manners, and sends the first end tag to the source AN through the core network user plane device, so that the source AN or the target
  • the AN can more flexibly generate the DRB-based end tag, and then solve the problem that the DRB cannot accurately transmit the DRB-based end tag to the target AN when the DRB is invisible to the core network.
  • the downlink data disorder caused by the UE handover is avoided.
  • the foregoing method before the step 501, further includes 500a-500d, as described below.
  • the core network control plane device receives a second handover request message sent by the source AN, where the second handover request message carries the number of the forwarding path and the first container, where the first container includes the Source DRB information of the UE and information of the source NG3 path.
  • the core network control plane device allocates resources for the forwarding path according to the number of the forwarding paths.
  • the core network control plane device allocates resources for the forwarding path, where the allocated resources may include a tunnel ID and an IP address of the forwarding path on the core network user plane device, and the source AN may send the data by using the allocated resource. Give the core network user plane device.
  • the number of forwarding paths may be 1, or may be N, and N is the number of source DRBs.
  • the core network control plane device sends a third handover request to the target AN, where the third handover request carries the first container.
  • the core network control plane device receives the second handover confirmation message sent by the target AN, where the second handover confirmation message carries the tunnel ID and the IP address of the forwarding path on the target AN.
  • the above method may further include:
  • the core network control plane device sends a handover command to the source AN, where the handover command carries an IP address and a tunnel ID of the forwarding path in the core network user plane device.
  • the above method may further include:
  • the core network control plane device sends a first notification message to the core network user plane device, where the first notification message is used to notify the core network user plane device that the resource allocation of the forwarding path is completed.
  • the embodiment of the present invention provides another method for sending an end tag, and the method is applied.
  • the scenario in which the source AN and the target AN can communicate directly is as follows.
  • the source AN sends a handover request message to the target AN, where the handover request message carries information of the source DRB information and the source NG3 path.
  • the target AN receives the handover request message, and establishes a target DRB and a target NG3 path according to the received handover request message, and allocates resources for the forwarding path.
  • the forwarding path may be based on the source NG3 path, that is, one source NG3 path corresponds to one forwarding path; or may be based on the source DRB or the target DRB, for example, one source NG3 path corresponds to N forwarding paths, where A forwarding path corresponds to a source DRB or a target DRB.
  • the core network control plane device may be pre-configured to the source AN and/or the target AN, which is not limited herein. The following two cases are divided according to the number of forwarding paths:
  • Scenario 1 The number of forwarding paths is 1, that is, the forwarding path is based on the source NG3 path.
  • the resource allocation in the step 602 refer to step 300d, and details are not described herein.
  • the number of forwarding paths is N, and N is the number of source DRBs, that is, the forwarding path is based on the source DRB or the target DRB.
  • the resource allocation for the forwarding path in step 602 may include:
  • the source DRB information includes the IDs of the two source DRBs, the resources of the two forwarding paths are allocated correspondingly; or
  • resources are allocated for the forwarding path. For example, if the number of target DRBs is three, resources corresponding to three forwarding paths are allocated.
  • the target AN sends a handover confirmation message to the source AN.
  • the handover confirmation message may carry the IP address and tunnel ID of the forwarding path on the target AN.
  • the source AN allocates resources for the forwarding path.
  • the source AN allocates an IP address and a tunnel ID of the forwarding path on the source AN.
  • the method further includes: the source AN storing at least one of the following correspondences:
  • the source AN sends a handover command to the UE.
  • the handover command is used to notify the UE to perform handover.
  • the target AN sends a path switch request to the core network control plane device.
  • the target AN receives the RRC reconfiguration complete (RRC reconfiguration complete) message sent by the UE, it determines that the UE successfully accesses the target AN.
  • RRC reconfiguration complete RRC reconfiguration complete
  • the path switch request message is used to request to switch the NG3 path, and the path switch request message may carry the ID of the source NG3 path and the information of the target NG3 path.
  • the information of the target NG3 path may include the IP address and the tunnel ID of the target NG3 path on the target AN; the ID of the source NG3 path may specifically be the tunnel ID of the source NG3 path on the source AN, or may be The tunnel ID of the source NG3 path on the core network user plane device.
  • the core network control plane device receives the path switch request message, and sends a modify tunnel request message to the core network user plane device.
  • the path switch request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the modify tunnel request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the ID of the source NG3 path and the information of the target NG3 path can be referred to the related description in the embodiment shown in FIG. 2.
  • the core network user plane device completes the switching of the NG3 path according to the modification tunnel request message.
  • step 608 refers to the related description of step 402, and details are not described herein.
  • the core network user plane device sends the first end tag to the source AN through the source NG3 path.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path, and may carry the IP address of the active NG3 path and the tunnel ID.
  • the first end tag may also carry a data category indicator or an ID of the UE.
  • the first end tag may carry the ID of the UE.
  • the first end tag may be generated by the core network user plane device, for example, using the implementation manner in step 403; the first end tag may also be generated by the core network control plane device, for example, using the implementation manner in step 502. No longer.
  • the method further includes: the core network control plane device sends the generated first end tag to the core network user plane device, for example, by step 607
  • the Modify Tunnel Request message in the middle sends the first end tag to the core network user plane device.
  • the source AN receives the first end tag, and generates N second end tags according to the first end tag.
  • the ith second end tag of the N second end tags generated by the step 610 carries the data class indicator of the xth source DRB of the source DRB corresponding to the source NG3 path.
  • the jth second end tag of the N second end tags carries a data class indicator of the yth source DRB of the source DRB corresponding to the source NG3 path, 1 ⁇ j ⁇ N, 1 ⁇ y ⁇ N, where i, j, x and y are integers, and i is not equal to j, and x is not equal to y.
  • the step 610 may specifically generate the N second end tags according to the correspondence between the first end tag and the source AN in step 604. For details, refer to the implementation of step 202 in the embodiment shown in FIG. Way, no longer repeat them.
  • the source AN sends N second end markers to the target AN by using a forwarding path.
  • the source AN sends N second end tags to the target AN through a forwarding path that corresponds one-to-one with the source NG3 path.
  • the target AN may match the data class indicator carried in the N second end tags with the data class indicator of the N target DRBs to obtain a second end tag corresponding to the target DRB, to assist in ordering the uplink and downlink data of the target DRB.
  • the source AN sends N second end tags to the target AN through the N forwarding paths, respectively. Since one forwarding path corresponds to one target DRB, one target DRB corresponds to one A second end tag. For example, suppose that the second end tag contains a second end tag numbered from 1 to N, and the forwarding path numbered 1 corresponds to the target DRB numbered 1, then the second end tag numbered 1 is numbered 1. When the forwarding path is sent to the target AN, the second end tag numbered 1 corresponds to the target DRB numbered 1, and the second end tag numbered 1 is used for the sorting of the downlink data of the UE on the target DRB with the number 1. .
  • the target AN receives a path switch request acknowledgement message sent by the core network control plane device.
  • the target AN notifies the source AN to release the resources of the UE.
  • the foregoing resources may include a source DRB.
  • the method for transmitting an end tag provided by the foregoing embodiment is applied to a scenario in which a source AN directly communicates with a target AN, and the source AN generates a second second end tag based on the target DRB according to the received end tag, and sends the target to the target.
  • the problem of the downlink data of the UE on the target DRB is solved, and the problem that the core network cannot accurately transmit the end marker of the target DRB to the target AN in the case that the DRB is invisible is solved, thereby avoiding the downlink data brought by the UE handover.
  • the end tag can be generated by the core network control plane device or the core network user plane device in various ways, so that the source AN can generate the DRB-based end tag more flexibly.
  • an embodiment of the present invention provides a method for transmitting an end tag, which is applied to a scenario in which a source AN and a target AN can directly communicate, as described below.
  • the source AN sends a handover request message to the target AN, where the handover request message carries information of the source DRB information and the source NG3 path.
  • the target AN receives the handover request message, and establishes a target DRB and a target NG3 path according to the received handover request message, and allocates resources for the forwarding path.
  • the forwarding path is based on the source NG3 path, that is, one source NG3 path corresponds to one forwarding path. On the target AN side, the forwarding path corresponds to M target DRBs.
  • step 300d For the allocation of resources for the forwarding path in step 602a, refer to step 300d, and details are not described herein.
  • the foregoing step 602a further includes: the target AN saves at least one of the following correspondences:
  • the target AN sends a handover confirmation message to the source AN.
  • the handover confirmation message may carry the IP address and tunnel ID of the forwarding path on the target AN.
  • the source AN allocates resources for the forwarding path.
  • the source AN allocates an IP address and a tunnel ID of the forwarding path on the source AN.
  • the source AN sends a handover command to the UE.
  • the handover command is used to notify the UE to perform handover.
  • the target AN sends a path switch request to the core network control plane device.
  • the target AN receives the RRC reconfiguration complete (RRC reconfiguration complete) message sent by the UE, it determines that the UE successfully accesses the target AN.
  • RRC reconfiguration complete RRC reconfiguration complete
  • the path switch request message is used to request to switch the NG3 path, and the path switch request message may carry the ID of the source NG3 path and the information of the target NG3 path.
  • the information of the target NG3 path may include the IP address and the tunnel ID of the target NG3 path on the target AN; the ID of the source NG3 path may specifically be the tunnel ID of the source NG3 path on the source AN, or may be The tunnel ID of the source NG3 path on the core network user plane device.
  • the core network control plane device receives the path switch request message, and sends a modify tunnel request message to the core network user plane device.
  • the path switch request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the modify tunnel request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the ID of the source NG3 path and the information of the target NG3 path can be referred to the related description in the embodiment shown in FIG. 2.
  • the core network user plane device completes the switching of the NG3 path according to the modified tunnel request message.
  • step 608a refers to the related description of step 402, and details are not described herein.
  • the core network user plane device sends a first end tag to the source AN through the source NG3 path.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path, and may carry the IP address of the active NG3 path and the tunnel ID.
  • the first end tag may also carry a data category indicator or an ID of the UE.
  • the first end tag may carry the ID of the UE.
  • the first end tag may be generated by the core network user plane device, for example, using the implementation manner in step 403; the first end tag may also be generated by the core network control plane device, for example, using the implementation manner in step 502. No longer.
  • the method further includes: the core network control plane device sends the generated first end tag to the core network user plane device, for example, by step 607a
  • the Modify Tunnel Request message in the middle sends the first end tag to the core network user plane device.
  • the source AN receives the first end tag and generates a second end tag according to the first end tag.
  • the second end flag may be generated by the source AN modifying only the path related information in the first end tag, for example, replacing the IP address and the tunnel ID of the source NG3 path in the first end tag with the forwarding path.
  • the IP address and the tunnel ID therefore, a first end tag corresponding to generate a second end tag.
  • the source AN sends a second end tag to the target AN through the forwarding path.
  • the target AN receives the second end tag, and generates M third end tags according to the second end tag.
  • M is the number of target DRBs corresponding to the forwarding path.
  • the M third end tags may be generated according to the correspondence between the source AN and the second end tag saved in step 602a. For reference, refer to the related description in step 302.
  • the target AN receives a path switch request acknowledgement message sent by the core network control plane device.
  • the target AN notifies the source AN to release the resources of the UE.
  • the foregoing resources may include a source DRB.
  • the method for transmitting the end tag provided by the foregoing embodiment is applied to a scenario in which the source AN directly communicates with the target AN, and the target AN generates an end tag based on the target DRB according to the received end tag to assist the uplink and downlink data of the target DRB. Sorting, solves the problem that the core network cannot accurately transmit the end marker based on the target DRB to the target AN when the DRB is invisible, thereby avoiding the downlink data disorder caused by the UE handover; in addition, the end marker can be controlled by the core network.
  • the face device or core network user plane device is generated in a variety of ways, enabling the target AN to more flexibly generate a DRB based end tag.
  • the embodiment of the present invention provides a method for transmitting an end tag, which is applied to a scenario in which a source AN and a target AN can communicate indirectly through a core network user plane device, as described below.
  • the source AN sends a first handover request message to the core network control plane device.
  • the first handover request message carries the number of forwarding paths and the first container.
  • step 300'a For the first container, refer to the related description in step 300'a, and details are not described herein.
  • the core network control plane device allocates resources according to the number of forwarding paths in the first handover request.
  • step 500b Specifically, reference may be made to the related description of step 500b.
  • the core network control plane device sends a second handover request message to the target AN, where the second handover request carries the first container.
  • the target AN establishes a target DRB and a target NG3 path according to the second handover request message, and allocates resources for the forwarding path.
  • the target AN establishes the target DRB and the target NG3 path according to the first container.
  • the target AN establishes the target DRB according to the source DRB information in the first container, and the number of the target DRB is the same as the number of the source DRB.
  • the target AN establishes the target NG3 path according to the information of the source NG3 path in the first container, as described in the related description of step 300c.
  • the forwarding path may be based on the source NG3 path, or may be based on the source DRB or the target DRB, and may be pre-configured by the core network control plane device to the source AN and/or the target AN, as shown in step 602. The related description will not be described again.
  • Case 1 The number of forwarding paths is 1, that is, the forwarding path is based on the source NG3 path.
  • the resource allocation in the step 704 refer to step 300d, and details are not described herein.
  • the number of forwarding paths is N, and N is the number of source DRBs, that is, the forwarding path is based on the source DRB or the target DRB.
  • the resource allocation for the forwarding path in step 704 may include:
  • Allocating resources for the forwarding path according to the source DRB information for example, the ID of one source DRB in the source DRB information, corresponding to the resource to which one forwarding path is allocated;
  • one target DRB corresponds to a resource that allocates one forwarding path.
  • the target AN sends a handover confirmation message to the core network control plane device.
  • the handover confirmation message carries the IP address and tunnel ID of the forwarding path on the target AN.
  • the core network control plane device receives the handover confirmation message sent by the target AN, and sends a notification message to the core network user plane device.
  • the notification message carries the IP address and tunnel ID of the forwarding path on the target AN.
  • the core network control plane device sends a first handover command to the source AN.
  • the first handover command carries an IP address and a tunnel ID of the forwarding path on the core network user plane device.
  • the source AN receives the first handover command, and allocates resources on the source AN for the forwarding path.
  • the method further includes: the source AN storing at least one of the following correspondences:
  • the source AN sends a second handover command to the UE.
  • the second handover command is used to notify the UE to perform handover.
  • the target AN sends a path switch request message to the core network control plane device.
  • the target AN receives the RRC reconfiguration complete message sent by the UE, it determines that the UE successfully accesses the target AN.
  • the path switch request message carries an NG2 connection identifier, an ID of the source NG3 path, and information of the target NG3 path.
  • the ID of the source NG3 path may be the IP address of the source NG3 path and the tunnel ID.
  • IP address of the source NG3 path and the tunnel ID refer to the related description in step 201, and details are not described herein.
  • the core network control plane device sends a modify tunnel request message to the core network user plane device.
  • the modified tunnel request message carries the information of the target NG3 path and the ID of the source NG3 path.
  • the core network user plane device completes the switching of the NG3 path according to the modification tunnel request message.
  • step 712 refers to the related description of step 402, and details are not described herein.
  • the core network user plane device sends a modify tunnel response message to the core network control plane device.
  • the core network user plane device sends a first end tag to the source AN through the source NG3 path.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path, and may carry the IP address of the active NG3 path and the tunnel ID.
  • the first end tag may also carry a data category indicator or an ID of the UE.
  • the first end tag may carry the ID of the UE.
  • the first end tag may be generated by the core network user plane device, for example, using the implementation manner in step 403; the first end tag may also be generated by the core network control plane device, for example, using the implementation manner in step 502. No longer.
  • the method further includes: the core network control plane device sends the generated first end tag to the core network user plane device, For example, the first end tag is sent to the core network user plane device by the Modify Tunnel Request message in step 711.
  • the source AN generates N second end tags according to the first end tag.
  • the ith second end tag of the N second end tags generated in step 715 carries the data class indicator of the xth source DRB in the source DRB of the UE, 1 ⁇ i ⁇ N, 1 ⁇ x ⁇ N
  • the jth second end tag of the N second end tags carries a data class indicator of the yth source DRB of the source DRB of the UE, 1 ⁇ j ⁇ N , 1 ⁇ y ⁇ N, where i, j, x, and y are integers, and i is not equal to j, and x is not equal to y.
  • the step 715 may specifically generate the N second end tags according to the correspondence between the first end tag and the source AN in step 708. For details, refer to the implementation of step 202 in the embodiment shown in FIG. Way, no longer repeat them.
  • the source AN sends N second end markers to the target AN by using a forwarding path.
  • the source AN sends N second end tags to the target AN through a forwarding path that corresponds one-to-one with the source NG3 path.
  • the target AN may match the data class indicator carried in the N second end tags with the data class indicator of the N target DRBs to obtain a second end tag corresponding to the target DRB, to assist in ordering the uplink and downlink data of the target DRB.
  • the source AN sends N second end tags to the target AN through N forwarding paths respectively. Since the forwarding path is based on the source DRB or the target DRB, one forwarding path corresponds to one target DRB, therefore, one The target DRB corresponds to a second end tag. For example, suppose that the second end tag contains a second end tag numbered from 1 to N, and the forwarding path numbered 1 corresponds to the target DRB numbered 1, then the second end tag numbered 1 is numbered 1. When the forwarding path is sent to the target AN, the second end tag numbered 1 corresponds to the target DRB numbered 1, and the second end tag numbered 1 is used for the sorting of the downlink data of the UE on the target DRB with the number 1. .
  • the core network control plane device notifies the source AN to release the resources of the UE.
  • the foregoing resources may include a source DRB.
  • the method for transmitting the end tag provided by the above embodiment is applied to the source AN and the target
  • the source AN generates the N second end tags based on the target DRB according to the received end tag, and sends them to the target AN to assist the ordering of the uplink and downlink data of the target DRB, and solves the problem that the core network is invisible in the DRB.
  • the target DRB-based end marker cannot be accurately sent to the target AN, thereby avoiding the downlink data disorder caused by the UE handover; in addition, the end marker can be adopted by the core network control plane device or the core network user plane device. The manner is generated such that the source AN or the target AN can generate the DRB-based end tag more flexibly.
  • an embodiment of the present invention provides a method for transmitting an end tag, which is applied to a scenario in which a source AN and a target AN can communicate indirectly through a core network user plane device, as described below.
  • the source AN sends a first handover request message to the core network control plane device.
  • the first handover request message carries the number of forwarding paths and the first container.
  • step 300'a For the first container, refer to the related description in step 300'a, and details are not described herein.
  • the core network control plane device allocates resources according to the number of forwarding paths in the first handover request.
  • the number of forwarding paths is 1, that is, one forwarding path corresponds to one source NG3 path.
  • step 500b Specifically, reference may be made to the related description of step 500b.
  • the core network control plane device sends a second handover request message to the target AN, where the second handover request carries the first container.
  • the target AN establishes a target DRB and a target NG3 path according to the second handover request message, and allocates resources for the forwarding path.
  • the target AN establishes the target DRB and the target NG3 path according to the first container.
  • the target AN establishes the target DRB according to the source DRB information in the first container, and the number of the target DRB is the same as the number of the source DRB.
  • the target AN establishes the target NG3 path according to the information of the source NG3 path in the first container, as described in the related description of step 300c.
  • step 704a For the allocation of resources for the forwarding path in step 704a, refer to step 300d, and details are not described herein.
  • step 704a further includes: the target AN saves at least one of the following correspondences:
  • the target AN sends a handover confirmation message to the core network control plane device.
  • the handover confirmation message carries the IP address and tunnel ID of the forwarding path on the target AN.
  • the core network control plane device receives the handover confirmation message sent by the target AN, and sends a notification message to the core network user plane device.
  • the notification message carries the IP address and tunnel ID of the forwarding path on the target AN.
  • the core network control plane device sends a first handover command to the source AN.
  • the first handover command carries an IP address and a tunnel ID of the forwarding path on the core network user plane device.
  • the source AN receives the first handover command, and allocates resources on the source AN for the forwarding path.
  • the source AN sends a second handover command to the UE.
  • the second handover command is used to notify the UE to perform handover.
  • the target AN sends a path switch request message to the core network control plane device.
  • the target AN receives the RRC reconfiguration complete message sent by the UE, it determines that the UE successfully accesses the target AN.
  • the path switch request message carries an NG2 connection identifier, an ID of the source NG3 path, and information of the target NG3 path.
  • the ID of the source NG3 path may be the IP address of the source NG3 path and the tunnel ID.
  • IP address of the source NG3 path and the tunnel ID refer to the related description in step 201, and details are not described herein.
  • the core network control plane device sends a modify tunnel request message to the core network user plane device.
  • the modified tunnel request message carries the information of the target NG3 path and the ID of the source NG3 path.
  • the core network user plane device completes the switching of the NG3 path according to the modification tunnel request message.
  • step 712a refers to the related description of step 402, and details are not described herein.
  • the core network user plane device sends a modify tunnel response message to the core network control plane device.
  • the core network user plane device sends a first end tag to the source AN through the source NG3 path.
  • the first end flag is used to indicate that the downlink data of the UE is sent on the source NG3 path, and may carry the IP address of the active NG3 path and the tunnel ID.
  • the first end tag may also carry a data category indicator or an ID of the UE.
  • the first end tag may carry the ID of the UE.
  • the first end tag may be generated by the core network user plane device, for example, using the implementation manner in step 403; the first end tag may also be generated by the core network control plane device, for example, using the implementation manner in step 502. No longer.
  • the method further includes: the core network control plane device sends the generated first end tag to the core network user plane device, for example, by step 711a.
  • the Modify Tunnel Request message in the middle sends the first end tag to the core network user plane device.
  • the source AN generates a second end tag according to the first end tag.
  • the second end flag may be generated by the source AN modifying only the path related information in the first end tag, for example, replacing the IP address and the tunnel ID of the source NG3 path in the first end tag with the forwarding path. IP address and tunnel ID; a first end tag corresponding to generate a second end tag.
  • the source AN sends a second end tag to the target AN through the forwarding path.
  • the source AN sends the second end tag to the target AN through a forwarding path that is in one-to-one correspondence with the source NG3 path.
  • the target AN receives the second end tag, and generates M third end tags according to the second end tag.
  • M is the number of target DRBs corresponding to the above forwarding path.
  • step 717a may generate M third end tags according to the correspondence between the second end tag and the target AN saved in step 704a. For details, refer to the related description in step 302.
  • the core network control plane device notifies the source AN to release the resources of the UE.
  • the foregoing resources may include a source DRB.
  • the method for transmitting the end tag provided by the foregoing embodiment is applied to a scenario in which the source AN communicates with the target AN indirectly, and the target AN generates an end tag based on the target DRB according to the received end tag to assist the uplink and downlink data of the target DRB. Sorting, solving the problem that the core network cannot accurately transmit the end marker based on the target DRB to the target AN when the DRB is invisible, thereby avoiding the downlink data disorder caused by the UE handover; in addition, the end marker can be controlled by the core network
  • the device or core network user plane device is generated in a variety of ways, enabling the source AN or the target AN to more flexibly generate a DRB based end tag.
  • the embodiment of the present invention provides a source AN, which can be used to perform the action of the source AN in the embodiment shown in FIG. 2 or 6 or 7.
  • the source AN may specifically include: a receiving unit 801, a generating unit 802, and a sending unit 803, as described below.
  • the receiving unit 801 is configured to receive, by using a source NG3 path between the source AN and the core network user plane device, a first end tag sent by the core network user plane device, where the first end tag is used to indicate the downlink of the UE.
  • the data is sent on the source NG3 path;
  • the generating unit 802 is configured to generate, according to the first end tag received by the receiving unit 801, N second end tags, where N is the number of source DRBs corresponding to the source NG3 path;
  • the sending unit 803 is configured to send, by using the forwarding path corresponding to the source NG3 path, the N second end tags generated by the generating unit 802 to the target AN, where the forwarding path is used by the source AN to pass the source NG3 The data of the UE received by the path is forwarded to the target AN.
  • the sending unit 803 is further configured to:
  • the handover request message Before receiving the first end tag sent by the core network user plane device by using the source NG3 path between the source AN and the core network user plane device, sending a first handover request message to the target AN, where the first The handover request message carries source data radio bearer DRB information of the UE and information of the source NG3 path;
  • the source DRB information of the UE includes: quality of service QoS information of the source DRB, an identifier ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path includes: an IP address and a tunnel ID of the source NG3 path on the source AN, and an IP address and a tunnel ID of the source NG3 path on the core network user plane device.
  • the receiving unit 801 can also be used to:
  • the first handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the sending unit 801 is further configured to:
  • the second handover request message carries the number of the forwarding path and the first container, where the first container includes source DRB information of the UE and information of the source NG3 path;
  • the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path includes: the source NG3 The IP address and tunnel ID of the path on the source AN, and the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the receiving unit 801 can also be used to:
  • the number of the forwarding path is 1, and the ith second end tag of the N second end tags carries a data category indication of the xth source DRB of the source DRB corresponding to the source NG3 path. a value of 1 ⁇ i ⁇ N, 1 ⁇ x ⁇ N, wherein the jth second end marker of the N second end markers carries a data category indication of the yth source DRB of the source DRB corresponding to the source NG3 path , 1 ⁇ j ⁇ N, 1 ⁇ y ⁇ N, where i, j, x and y are integers, and i is not equal to j, and x is not equal to y.
  • the number of the forwarding paths is N, and the generating unit 802 is specifically configured to:
  • the first The end tag carries a data category indicator.
  • the generating the N second end tags according to the ID of the forwarding path, the correspondence between the data category indicator and the ID of the source NG3 path, and the first end tag may include :
  • the source end AN provided by the foregoing embodiment generates a second end tag based on the DRB according to the first end tag sent by the core network user plane device received by the source NG3 path, and sends the second end tag to the target AN through the forwarding path corresponding to the DRB.
  • the problem of the uplink and downlink data of the auxiliary target DRB is solved, and the problem that the core network cannot accurately transmit the DRB-based end marker to the target AN when the DRB is invisible is solved, and the downlink data disorder caused by the UE handover is avoided.
  • the embodiment of the present invention provides a target AN, which may be used to perform the action of the target AN in the embodiment shown in FIG. 3 or 6a or 7a.
  • the AN may specifically include: a receiving unit 901 and a generating unit. 902, as described below.
  • the receiving unit 901 is configured to receive a second end tag sent by the source AN, where the forwarding path is used by the source AN to forward data of the UE received through the source NG3 path to the target AN, where the forwarding path is One-to-one correspondence of source NG3 paths;
  • the generating unit 902 is configured to generate M third end tags according to the second end tag received by the receiving unit 901, where the M is the number of target DRBs corresponding to the forwarding path, and the third ending tag is used by Downlinking the downlink data of the UE on the target DRB corresponding to the third end tag.
  • the generating unit 902 is specifically configured to:
  • the target AN further includes: a first processing unit 903;
  • the receiving unit 901 is further configured to: before receiving the second end tag sent by the source AN by using the forwarding path, receive a first handover request message sent by the source AN, where the first handover request message carries source DRB information of the UE And information of the source NG3 path;
  • the first processing unit 903 is configured to establish the target DRB according to the source DRB information, establish a target NG3 path according to the information of the source NG3 path, and allocate a resource for the forwarding path;
  • the source DRB information of the UE includes: the quality of service QoS information of the source DRB, the ID of the source DRB, and the data category indicator of the source DRB;
  • the information of the source NG3 path includes: The IP address and tunnel ID of the source NG3 path on the source AN, and the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the foregoing target AN further includes:
  • the first sending unit 904 is configured to send a first handover confirmation message to the source AN, where the first handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the foregoing target AN further includes:
  • the second sending unit 905 is configured to send a first path switching request message to the core network control plane device, where the first path switching request message is used to request to switch the NG3 path.
  • the first path switch request message carries the ID of the source NG3 path and the information of the target NG3 path, and the information of the target NG3 path includes the IP address and the tunnel ID of the target NG3 path on the target AN. .
  • the first path switch request message may further carry a data category indicator list of the target NG3 path.
  • the foregoing target AN further includes: a second processing unit 906 and a third sending unit 907;
  • the receiving unit 901 is further configured to: before receiving the second end tag sent by the source AN by using the forwarding path, receive a third handover request message sent by the core network control plane device, where the third switch request message carries the first container, where The first container includes source DRB information of the UE and information of the source NG3 path;
  • the second processing unit 906 is configured to establish the target DRB according to the source DRB information, establish a target NG3 path according to the information of the source NG3 path, and set the forwarding path according to the third handover request message. resource allocation;
  • the third sending unit 907 is configured to send a second handover confirmation message to the core network control plane device, where the second handover confirmation message carries forwarding path information of the target AN;
  • the source DRB information of the UE includes: QoS information of the source DRB, an ID of the source DRB, and a data category indicator of the source DRB;
  • the information of the source NG3 path includes: the source NG3 The IP address and tunnel ID of the path on the source AN, and the IP address and tunnel ID of the source NG3 path on the core network user plane device.
  • the third sending unit 907 can also be used to:
  • the second path switching request message carries an ID of the source NG3 path, and the target NG3 road
  • the information of the path and the NG2 connection identifier, the information of the target NG3 path includes an IP address and a tunnel ID of the target NG3 path on the target AN, and the NG2 connection identifier is used to indicate that the UE handover is complete.
  • the target AN provided by the foregoing embodiment is configured to generate a third end tag based on the target DRB according to the second end tag sent by the source AN received through the forwarding path, to assist the ordering of the downlink data of the UE on the target DRB, and solve the core network.
  • the DRB is invisible, the problem that the DRB-based end marker is not accurately sent to the target AN cannot be accurately transmitted, thereby avoiding the downlink data disorder caused by the UE handover.
  • the embodiment of the present invention provides a core network user plane device, which can be used to perform the action of the core network user plane device in any of the embodiments shown in FIG. 4 or 6-7a, where the device may specifically include
  • the receiving unit 1001 is configured to receive a modified tunnel request message sent by the core network control plane device, where the modified tunnel request message carries the ID of the source NG3 path and the information of the target NG3 path, where the source NG3 path is the source access node AN and a transmission path between the core network user plane devices, where the target NG3 path is a transmission path between the target AN and the core network user plane device, and the information of the target NG3 path includes the target NG3 path at the location The IP address and tunnel ID on the target AN;
  • the switching unit 1002 is configured to implement switching of the NG3 path according to the modified tunnel request message.
  • a generating unit 1003 configured to generate a first end tag, and send the first end tag to the source AN by using the source NG3 path, where the first end tag is used to indicate that downlink data of the user equipment UE is in the The transmission is completed on the source NG3 path.
  • the generating unit 1003 is specifically configured to:
  • the number of the first end tag is the same as the number of data category indicators included in the data category indicator list;
  • the modified tunnel request message may further carry the data category indicator list of the target NG3 path, or the ID of the UE.
  • the first end tag is generated in multiple manners, and the first end tag is sent to the source AN, so that the source AN or the target AN can generate the DRB-based end tag more flexibly. Therefore, the core network cannot accurately transmit the DRB-based end marker to the target AN when the DRB is invisible, thereby avoiding the downlink data disorder caused by the UE handover.
  • an embodiment of the present invention provides a core network control plane device, which may be used to perform operations of a core network control plane device in any implementation shown in FIG. 5-7a, and the device may include: a receiving unit 1101.
  • the generating unit 1102 and the transmitting unit 1103 are specifically as follows.
  • the receiving unit 1101 is configured to receive a path switch request message sent by the target access node AN, where the path switch request message is used to request to switch the NG3 path, where the path switch request message carries the ID of the source NG3 path and the information of the target NG3 path.
  • the information of the target NG3 path includes an IP address and a tunnel ID of the target NG3 path on the target AN;
  • a generating unit 1102 configured to generate a first end tag, where the first end tag is used to indicate that downlink data of the user equipment UE is sent on the source NG3 path;
  • the sending unit 1103 is configured to send a modify tunnel request message to the core network user plane device, where the modified tunnel request message carries the ID of the source NG3 path, the information of the target NG3 path, and the first end tag.
  • the generating unit 1102 is specifically configured to:
  • the path switch request message further carries an NG2 connection identifier, where the NG2 connection identifier is used to indicate that the UE handover is complete; or
  • the path switch request further carries a data category indicator list of the target NG3 path
  • the modified tunnel request message further carries a data category indicator list of the target NG3 path.
  • the core network control plane device further includes a processing unit 1104;
  • the receiving unit 1101 is further configured to: before receiving the path switching request message sent by the target AN, receive a second handover request message sent by the source AN, where the second handover request message carries the number of the forwarding path and the a first container, where the first container includes source DRB information of the UE and information of the source NG3 path;
  • the processing unit 1104 is configured to allocate resources for the forwarding path according to the number of the forwarding paths.
  • the sending unit 1103 is further configured to send a third handover request to the target AN, where the third handover request carries the first container;
  • the receiving unit 1101 is further configured to receive a second handover confirmation message sent by the target AN, where the second handover confirmation message carries an IP address and a tunnel ID of the forwarding path on the target AN.
  • the sending unit 1103 is further configured to:
  • the handover command carries an IP address and a tunnel ID of the forwarding path in the core network user plane device.
  • the sending unit 1103 is further configured to:
  • the first end tag is generated in multiple manners, and the first end tag is sent to the source AN through the core network user plane device, so that the source AN or the target AN can be more flexibly
  • the DRB-based end tag is generated to solve the problem that the core network cannot accurately transmit the DRB-based end tag to the target AN when the DRB is invisible, thereby avoiding the downlink data disorder caused by the UE handover.
  • an embodiment of the present invention provides a source AN, which may include a processor 1201, a memory 1202, a communication interface 1203, and a transceiver 1204, as described below.
  • a memory 1202 configured to store a program
  • the processor 1201 is configured to execute the program stored in the memory 1202 to implement the action of the source AN in the embodiment shown in FIG. 2 or 6 or 7, and details are not described herein.
  • the message sent by the source AN to the target AN or the core network control plane device or the core network user plane device may be sent through the communication interface 1203;
  • the message sent by the target AN or the core network control plane device or the core network user plane device to the source AN may be received through the communication interface 1203.
  • the message sent by the source AN to the UE may be sent by the transceiver 1204, and the source AN may also be sent and received.
  • the router 1204 receives a message sent by the UE to the source AN.
  • an embodiment of the present invention provides a target AN, which may specifically include: a processor 1301, a memory 1302, a communication interface 1303, and a transceiver 1304, as described below.
  • the processor 1301 is configured to execute the program stored in the memory 1302 to implement the action of the target AN in the embodiment shown in FIG. 2 or 6a or 7a, and details are not described herein.
  • the target AN is sent to the source AN or the core.
  • the message of the network control plane device or the core network user plane device may be sent through the communication interface 1303; the target AN may also receive the message sent by the source AN or the core network control plane device or the core network user plane device to the target AN through the communication interface 1203.
  • the message sent by the target AN to the UE may be sent by the transceiver 1304, and the target AN may also receive the message sent by the UE to the target AN through the transceiver 1304.
  • an embodiment of the present invention provides a core network user plane device, where the core network user plane device may include: a processor 1401, a memory 1402, and a communication interface 1403, as described below.
  • a memory 1402 configured to store a program
  • the processor 1401 is configured to execute the program stored in the memory 1402 to implement the actions of the core network user plane device in any of the embodiments shown in FIG. 4 or 6-7a, and details are not described herein.
  • the message sent by the core network user plane device to the source AN or the core network control plane device may be sent through the communication interface 1403; the core network user plane device may also receive the source AN or the core network control plane through the communication interface 1403. The message sent by the device to the core network user plane device.
  • an embodiment of the present invention provides a core network control plane device, including: a processor 1501, a memory 1502, and a communication interface 1503, as described below.
  • a memory 1502 configured to store a program
  • the processor 1501 is configured to execute the program stored in the memory 1502 to implement the operations of the core network control plane device in any implementation shown in FIG. 5-7a, and details are not described herein.
  • the message sent by the core network control plane device to the source AN or the core network user plane device or the target AN may be sent through the communication interface 1503; the core network control plane device may also receive the source AN or the core through the communication interface 1403. A message sent by the network user plane device or the target AN to the core network control plane device.
  • the present invention also provides a communication system, which may include the source AN shown in FIG. 8, the core network user plane device shown in FIG. 10, and the core network control plane device shown in FIG.
  • the system may further include a target AN, configured to receive N second end tags sent by the source AN; the target AN may also be used to sort the UE downlink data on the target DRB by using the second end tag.
  • the present invention further provides another communication system, which can be applied to a scenario in which the forwarding path is in one-to-one correspondence with the source NG3 path, and specifically includes the target AN shown in FIG. 9 and the core network user plane device shown in FIG. And the core network control plane device shown in FIG.
  • the system may further include a source AN, configured to receive a first end tag sent by the core network user plane device, generate a second end tag according to the first end tag, and end the second end by using a forwarding path corresponding to the source NG3 path. The tag is sent to the target AN.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes The steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Abstract

本发明公开了一种发送结束标记的方法、设备和系统。该方法包括：源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记；所述源AN根据所述第一结束标记，生成N个第二结束标记，所述N为所述源NG3路径对应的源DRB的个数；所述源AN通过所述源NG3路径对应的转发路径发送所述N个第二结束标记给目标AN，通过该方法实现了核心网在DRB不可见的情况下，目标AN能够准确获得基于DRB的结束标记，保证了UE在切换场景下目标DRB上的下行数据排序正确。

Description

发送结束标记的方法、设备和系统 技术领域
本发明涉及移动通信系统，尤其涉及一种发送结束标记的方法、设备和系统。
背景技术
NextGen(NG)是下一代移动通信系统架构简称，参见图1，具体可以由用户设备(user equipment，UE)，接入节点(access node，AN)，核心网(Core network，CN)和数据网络(data network)构成。其中，CN在逻辑上均可以分为用户面和控制面两部分，控制面负责移动网络的管理，用户面负责业务数据的传输。参见图1，NG2为AN和CN的控制面之间的传输路径，NG3为AN和CN的用户面之间的传输路径，NG6为CN的用户面和数据网络之间的传输路径。
UE：移动用户与网络交互的入口，能够提供基本的计算能力，存储能力，向用户显示业务窗口，接受用户操作输入。NG UE会采用下一代空口技术，与AN建立信号连接，数据连接，从而传输控制信号和业务数据到移动网络。
AN：类似于传统网络(例如，2G到4G)里面的基站，部署在靠近UE的位置，为特定区域的授权用户提供入网功能，并能够根据用户的级别，业务的需求等使用不同质量的传输隧道传输用户数据。AN能够管理自身的资源，按需为UE提供接入服务，在UE和核心网之间转发控制信号和用户数据。
CN：负责维护移动网络的签约数据，管理移动网络的网元，为UE提供提供会话管理，移动性管理，策略管理，安全认证等功能。在UE附着的时候，为UE提供入网认证；在UE有业务请求时，为UE分配网络资源；在UE移动的时候，为UE更新网络资源；在UE空闲的时候，为UE提供快恢复机制；在UE去附着的时候，为UE释放网络资源；在UE有业务数据时，为UE提供数据路由功能，如转发上行数据到data network；或者从data network接收UE下 行数据，转发到AN，从而发送给UE。
data network：为UE提供业务服务，可以是私有网络，如局域网，也可以是不受运营商管控的外部网络，如Internet，还可以是运营商共同部署的专有网络。
在NG移动网络中，被广泛接受的一种数据路径实现方式：数据路径由NG3路径和空口路径组成。其中，NG3路径可以是基于节点(例如，AN)，UE，会话(session)或流等，例如，每个UE对应一个NG3路径，或者，每个session对应一个NG3路径，或者，每个AN对应一个NG3路径；空口路径可以由1个或者多个数据无线承载(data radio bear，DRB)组成。NG3路径对于核心网可见，由核心网的控制面维护，但空口路径上的DRB对于核心网不可见，由AN负责维护。
在上述数据路径实现方式中，由于空口路径上的DRB对于核心网是不可见的，核心网无法生成基于DRB的结束标记，其中，基于DRB的结束标记用于辅助目标AN对目标DRB上的下行数据进行排序，因此在UE从源AN切换到目标AN的过程中，核心网无法将基于DRB的结束标记发送给目标AN，从而引发UE切换带来的下行数据乱序的问题。
发明内容
本发明实施例提供一种发送结束标记的方法、设备和系统，能够实现在空口路径上的DRB对于核心网不可见的情况下，目标AN准确地获知基于DRB的结束标记。
第一方面，提供了一种发送结束标记的方法，所述方法包括：源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记，所述第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕；所述源AN根据所述第一结束标记，生成N个第二结束标记，所述N为所述源NG3路径对应的源DRB的个数；所述源AN通过所述转发路径发送所述N个第二结束标记给目标AN，所述转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。
结合第一方面，在第一方面的第一种实现方式中，在所述源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，所述方法还包括：所述源AN向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源数据无线承载DRB信息和所述源NG3路径的信息；其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的标识ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。结合第一方面的第一种实现方式，在第一方面的第二种实现方式中，所述方法还包括：所述源AN接收所述目标AN的第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
结合第一方面，在第一方面的第三种实现方式中，在所述源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，所述方法还包括：所述源AN向核心网控制面设备发送第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第一方面的第三种实现方式，在第一方面的第四种实现方式中，所述方法还包括：所述源AN接收所述核心网控制面设备发送的切换命令，所述切换命令携带所述转发路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第一方面或第一方面的上述任一种实现方式，在第一方面的的第五种实现方式中，所述源AN根据所述第一结束标记，生成N个第二结束标记，包括：所述源AN根据所述转发路径与所述源NG3路径两者之间的对应关系和所述第 一结束标记，生成所述N个第二结束标记；或者，所述源AN根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID。
第二方面，提供了一种发送结束标记的方法，所述方法包括：目标接入节点AN通过转发路径接收源AN发送的第二结束标记，所述转发路径用于所述源AN将通过源下一代NG3路径接收的用户设备UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应；所述目标AN根据所述第二结束标记，生成M个第三结束标记，所述M为所述转发路径对应的目标DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数据排序。
结合第二方面，在第二方面的第一种实现方式中，所述目标AN根据所述第二结束标记，生成M个第三结束标记，包括：所述目标AN根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记；或者，所述目标AN根据所述转发路径，用户设备UE的标识ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
结合第二方面或第二方面的第一种实现方式，在第二方面的第二种实现方式中，在所述目标AN通过转发路径接收源AN发送的第二结束标记之前，所述方法还包括：所述目标AN接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；所述目标AN根据所述源DRB信息，建立所述目标DRB；所述目标AN根据所述源NG3路径的信息，建立目标NG3路径；所述目标AN为所述转发路径分配资源；其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第二方面的第二种实现方式，在第二方面的第三种实现方式中，所述方法还包括：所述目标AN发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；其中，所述第一路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID。
结合第二方面的第三种实现方式，在第二方面的第四种实现方式中，所述第一路径切换请求消息还携带有所述目标NG3路径的数据类别指示符列表。
结合第二方面，在第二方面的第五种实现方式中，在所述目标AN通过转发路径接收源AN发送的第二结束标记之前，所述方法还包括：所述目标AN接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；所述目标AN根据所述源DRB信息，建立所述目标DRB；所述目标AN根据所述源NG3路径的信息，建立目标NG3路径；所述目标AN根据所述第三切换请求消息，为所述转发路径分配资源；所述目标AN向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述目标AN的转发路径信息；其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第二方面的第五种实现方式，在第二方面的第六种实现方式中，所述方法还包括：所述目标AN发送第二路径切换请求消息给所述核心网控制面设备，所述第二路径切换请求消息用于请求切换NG3路径；其中，所述第二路径切换请求消息携带源NG3路径的ID，所述目标NG3路径的信息和NG2连接标识，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID，所述NG2连接标识用于指示所述UE切换完成。
第三方面，提供了一种源AN，包括：接收单元，用于通过所述源AN与核 心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记，所述第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕；生成单元，用于根据所述接收单元接收的所述第一结束标记，生成N个第二结束标记，所述N为所述源NG3路径对应的源DRB的个数；发送单元，用于通过所述转发路径发送所述生成单元生成的所述第二结束标记给目标AN，所述转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。
结合第三方面，在第三方面的第一种实现方式中，所述发送单元还用于：在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第三方面，在第三方面的第一种实现方式中，所述发送单元还用于：在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向核心网控制面设备发送第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第三方面或第三方面的第一种实现方式，在第三方面的第二种实现方式中，所述转发路径的个数为N，所述生成单元具体用于：根据所述转发路径 与所述源NG3路径两者之间的对应关系和所述第一结束标记，生成所述N个第二结束标记；或者，根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID。
第四方面，提供了一种目标AN，包括：接收单元，用于接收源AN发送的第二结束标记，所述转发路径用于所述源AN将通过源NG3路径接收的用户设备UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应；生成单元，用于根据所述接收单元接收的所述第二结束标记，生成M个第三结束标记，所述M为所述转发路径对应的目标DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数据排序。
结合第四方面，在第四方面的第一种实现方式中，所述生成单元具体用于：根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记；或者，根据所述转发路径，用户设备UE的标识ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
结合第四方面或第四方面的第一种实现方式，在第四方面的第二种实现方式中，还包括：第一处理单元；所述接收单元，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；所述第一处理单元，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并为所述转发路径分配资源；其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
结合第四方面的第二种实现方式，在第四方面的第三种实现方式中，所述 发送单元还用于：发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；其中，所述第一路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID。
结合第四方面的第三种实现方式，在第四方面的第四种实现方式中，所述第一路径切换请求消息还携带有所述目标NG3路径的数据类别指示符列表。
结合第四方面或第四方面的第一种实现方式，在第四方面的第五种实现方式中，还包括：第二处理单元；所述接收单元，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；所述第二处理单元，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并根据所述第三切换请求消息，为所述转发路径分配资源；所述发送单元，还用于向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述目标AN的转发路径信息；其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
第五方面，提供了一种发送结束标记的方法，所述方法包括：核心网用户面设备接收核心网控制面设备发送的修改隧道请求消息，所述修改隧道请求消息携带源下一代NG3路径的标识ID和目标NG3路径的信息，所述源NG3路径为源接入节点AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径为目标AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；所述核心网用户面设备根据所述修改隧道请求消息，实现NG3路径的切换；所述核心网用户面设备生成第一结束标记，并通过所述源NG3路径向所述源AN发送所述第一结束标 记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕。
结合第五方面，在第五方面的第一种实现方式中，所述核心网用户面设备生成第一结束标记，包括：所述核心网用户面设备根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同；或者，所述核心网用户面设备根据所述目标NG3路径的数据类别指示符列表，生成所述第一结束标记，所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同；或者，所述核心网用户面设备根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
结合第五方面的第一种实现方式，在第五方面的第二种实现方式中，所述修改隧道请求消息还携带有所述目标NG3路径的所述数据类别指示符列表，或者，所述UE的ID。
第六方面，提供了一种发送结束标记的方法，所述方法包括：核心网控制面设备接收目标接入节点AN发送的路径切换请求消息，所述路径切换请求消息用于请求切换下一代NG3路径，所述路径切换请求消息携带源NG3路径的标识ID和目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；所述核心网控制面设备生成第一结束标记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕；所述核心网控制面设备向核心网用户面设备发送修改隧道请求消息，所述修改隧道请求消息携带所述源NG3路径的ID，所述目标NG3路径的信息和所述第一结束标记。
结合第六方面，在第六方面的第一种实现方式中，所述核心网控制面设备生成第一结束标记，包括：所述核心网控制面设备根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同；或者，所述核心网控制面设备根据所述目标NG3路径的数据类别指示符列表， 生成所述第一结束标记，所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同；或者，所述核心网控制面设备根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
结合第六方面的第一种实现方式，在第六方面的第二种实现方式中，所述路径切换请求消息还携带有NG2连接标识，所述NG2连接标识用于指示UE切换完成；或者，所述路径切换请求还携带有所述目标NG3路径的数据类别指示符列表，所述修改隧道请求消息还携带有所述目标NG3路径的数据类别指示符列表。
结合第六方面或第六方面的上述任一种实现方式，在第六方面的第三种实现方式中，在核心网控制面设备接收目标AN发送的路径切换请求消息之前，所述方法还包括：所述核心网控制面设备接收所述源AN发送的第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和所述第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；所述核心网控制面设备根据所述转发路径的个数，为所述转发路径分配资源；所述核心网控制面设备向所述目标AN发送第三切换请求，所述第三切换请求携带所述第一容器；
所述核心网控制面设备接收所述目标AN发送的第二切换确认消息，所述第二切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
采用上述第一方面提供的方法或第三方面提供的源AN，通过源NG3路径接收核心网用户面设备发送的第一结束标记，根据第一结束标记生成基于DRB的第二结束标记，并通过转发路径发送给目标AN，以辅助目标DRB上UE的下行数据排序，解决了核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN的问题，避免了UE切换带来的下行数据乱序。
采用上述第二方面提供的方法或第四方面提供的目标AN，通过转发路径接收源AN发送的第二结束标记，根据第二结束标记生成基于目标DRB的第三结束标记，以在目标DRB上辅助UE的下行数据排序，解决了核心网在DRB 不可见的情况下无法准确发送基于DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图进行简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为下一代移动通信系统架构图；
图2为本发明实施例提供的一种发送结束标记方法的流程图；
图3为本发明实施例提供的另一种发送结束标记方法的流程图；
图4为本发明实施例提供的另一种发送结束标记方法的流程图；
图5为本发明实施例提供的再一种发送结束标记方法的流程图；
图6为本发明实施例提供的一种发送结束标记方法的信令交互图；
图6a为本发明实施例提供的另一种发送结束标记方法的信令交互图；
图7为本发明实施例提供的又一种发送结束标记方法的信令交互图；
图7a为本发明实施例提供的又一种发送结束标记方法的信令交互图；
图8为本发明实施例提供的一种源AN的结构图；
图9为本发明实施例提供的一种目标AN的结构图；
图10为本发明实施例提供的一种核心网控制面设备的结构图；
图11为本发明实施例提供的一种核心网用户面设备的结构图；
图12为本发明实施例提供的一种源AN的硬件结构图；
图13为本发明实施例提供的一种目标AN的硬件结构图；
图14为本发明实施例提供的一种核心网控制面设备的硬件结构图；
图15为本发明实施例提供的一种核心网用户面设备的硬件结构图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，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他实施例，都属于本发明保护的范围。
需要说明的是，本发明各实施例所提及的核心网用户面设备以及核心网控制面设备是可以集成在同一个核心网设备上的，也可以分布在两个独立的核心网设备上，还可以是数据中心或服务器上的两个不同的网络功能实体。其中，核心网用户面设备用于实现图1所示CN的数据路由功能，核心网控制面设备用于实现图1所示CN的移动网络的管理功能，例如，移动网络的签约数据，管理移动网络的网元，为UE提供会话管理，移动性管理，策略管理，和安全认证等功能。
此外，由于本发明各实施例应用于UE的切换场景，源AN指的是在UE切换之前为该UE提供服务的AN，目标AN指的是在UE切换之后为该UE提供服务的AN。相应地，源DRB指的是源AN与UE之间的空口传输路径，目标DRB指的是目标AN与UE之间的空口传输路径；源NG3路径指的是在源AN与核心网用户面设备之间用于传输该UE下行数据的NG3路径；目标NG3路径指的是在目标AN与核心网用户面设备之间用于传输该UE下行数据的NG3路径。
需要说明的是，本发明各实施例中提及的源NG3路径或目标NG3路径均可以是基于AN，UE，会话(session)或流等，例如，当源NG3路径是基于UE时，一个UE对应一个源NG3路径；或者，当源NG3路径是基于session时，一个session对应一个NG3路径；或者，当源NG3路径是基于AN时，一个AN对应一个NG3路径。此外，本发明各实施例均以源NG3路径为一个的情况为例进行描述的，对于多个源NG3路径的情况实现方法类似，属于本发明的保护范围。
如图2所示，本发明实施例提供了一种发送结束标记的方法，具体如下所述。
201、源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕；它可以是一种消息，可以携带有源NG3路径的IP地址和隧道ID。
其中，源NG3路径的IP地址和隧道ID可以包括源NG3路径在源AN上的IP地址和隧道ID，和/或，源NG3路径在核心网用户面设备上的IP地址和隧道ID。
具体地，第一结束标记可以由核心网，(例如，核心网用户面设备或核心网控制面设备)生成的，例如，核心网根据源NG3路径的ID生成，即一个NG3路径的ID对应生成一个结束标记，此时，第一结束标记是基于源NG3路径的结束标记；但由于DRB对核心网不可见，因此核心网无法基于DRB生成结束标记。上述第一结束标记的生成具体可以参见图4或图5所示的实施例，不再赘述。
其中，上述UE的ID用于标识UE，具体可以为国际移动台标识(International Mobile Subscriber Identity，IMSI)，移动性管理实体-临时移动用户识别号(M-temporary mobile subscriber identity，M-TMSI)，全局唯一的临时标识(globally unique temporary identity，GUTI)或SAE临时移动用户标识(SAE-temporary mobile subscriber identity，S-TMSI)。
202、源AN根据所述第一结束标记，生成N个第二结束标记。
其中，N为所述源NG3路径对应的源DRB的个数。当源DRB为多个时，N可以为大于或等于2的整数。
其中，第二结束标记可以携带有转发路径的IP地址和隧道ID，其中，转发路径的IP地址和隧道ID可以包括转发路径在源AN上的IP地址和隧道ID，和/或，转发路径在目标AN上的IP地址和隧道ID。
需要说明的是，源NG3路径与源DRB可以存在预设的对应关系，该对应关系可以存储在源AN上，例如，在不发生切换的情况下，源AN接收源NG3路径上发送的下行数据，会通过源NG3路径对应的源DRB发送给UE；源AN通过源DRB接收的上行数据，通过该源DRB对应的源NG3路径发送给核心网。具体地，该源NG3路径对应的源DRB可以包括一个或多个源DRB。
203、源AN通过所述源NG3路径对应的转发路径发送N个第二结束标记给 目标AN。
其中，源NG3路径对应的转发路径指的是用于传输该源NG3路径上UE的下行数据的转发路径。例如，一个源NG3路径可以对应一个或多个转发路径，该一个或多个转发路径用于传输该源NG3路径上传输的UE的下行数据，如下：
当源NG3路径对应一个转发路径时，表明源NG3路径上传输的UE的下行数据可以通过该一个转发路径发送给目标AN；
当源NG3路径对应多个转发路径，表明源NG3路径上传输的UE的下行数据可以通过多个转发路径发送给目标AN。
其中，转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。显然，转发路径是源AN与目标AN之间的传输通道，可以是直接传输通道，也可以是间接传输通道。具体地，直接传输通道指的是源AN与目标AN之间可以直接通信，不需要第三方设备转发；间接传输通道指的是源AN与目标AN之间不可以直接通信，需要通过第三方设备转发。该第三方设备可以为核心网用户面设备。
可选地，所述转发路径的个数为N，即转发路径的个数与源DRB的个数相同，换言之，转发路径是基于源DRB的。进一步地，上述步骤202具体可以采用如下两种方式实现：
方式一、源AN根据所述转发路径与所述源NG3路径两者之间的对应关系和所述第一结束标记，生成所述N个第二结束标记。
其中，所述转发路径与所述源NG3路径两者之间的对应关系可以是所述转发路径的ID与所述源NG3路径的ID之间的对应关系，具体可以采用列表的形式预先设置在源AN上。
其中，转发路径的ID可以是转发路径的IP地址和隧道ID；源NG3路径的ID可以是源NG3路径的IP地址和隧道ID。
进一步地，转发路径的IP地址和隧道ID可以参见步骤202中的相关描述，源NG3路径的IP地址和隧道ID可以参见步骤201中的相关描述，不再赘述。
具体地，源AN在接收第一结束标记时，可以获得传输该第一结束标记的源NG3路径的ID，使用获得的源NG3路径的ID查找所述转发路径的ID与所述源NG3路径的ID之间的对应关系，可以获得与源NG3路径对应的转发路径的ID；根据获得的转发路径的ID，生成该转发路径对应的第二结束标记，并通过该转发路径发送给目标AN。
上述方式一可以应用于第一结束标记是基于源NG3路径的结束标记的场景，在该场景下，源AN根据基于源NG3路径的第一结束标记，生成基于源DRB或目标DRB的第二结束标记，并发送给目标AN，以辅助目标AN在目标DRB上的下行数据排序，避免了在DRB不可见的情况下核心网无法生成并发送基于DRB的结束标记给目标AN所导致的目标DRB上下行数据乱序的问题。
方式二、源AN根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID。
其中，源AN根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系可以为转发路径的ID，源NG3路径的ID以及UE的ID三者之间的对应关系。具体地，转发路径的ID，源NG3路径的ID可以参见方式一中的相关描述，不再赘述。
具体地，源AN在接收第一结束标记时，可以获得传输该第一结束标记的源NG3路径的ID和该UE的ID；根据获得的源NG3路径的ID和该UE的ID，可以查找上述对应关系，获得与该UE的源NG3路径对应的转发路径的ID；根据获得的转发路径的ID，生成该转发路径对应的第二结束标记，并通过该转发路径发送给目标AN。
需要指出的是，上述方式二可以应用于所述源NG3路径是基于AN的路径的场景，在该场景下，多个UE可以共享一个源NG3路径，为了识别源NG3路径上传输的结束标记归属的UE，第一结束标记可以根据UE的ID和源NG3路径的信息生成。通过上述方式二，源AN根据第一结束标记，生成基于该UE 的源DRB或目标DRB的第二结束标记，避免了核心网在DRB不可见的情况下无法生成并发送基于DRB的结束标记给目标AN所导致的目标DRB上下行数据乱序的问题。
采用上述两种实现方式可以看出，第二结束标记是基于源DRB的，由于源DRB与目标DRB是一一对应的，因此，上述生成的N个第二结束标记也是基于目标DRB的。
可选地，所述转发路径的个数为1，也就是说，转发路径是基于源NG3路径的，即一个源NG3路径对应一个转发路径。进一步地，上述步骤202中生成的所述N个第二结束标记中第i个第二结束标记携带所述源NG3路径对应的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述源NG3路径对应的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。具体地，第二结束标记与源DRB是一一对应的，第二结束标记携带其对应的源DRB的数据类别指示符。
例如，假设N＝3，第1个第二结束标记可以携带第1个源DRB的数据类别指示符；第2个第二结束标记可以携带第2个源DRB的数据类别指示符；第3个第二结束标记可以携带第3个源DRB的数据类别指示符。
此时，步骤203中具体包括：源AN通过上述一个转发路径发送生成的N个第二结束标记。
由于上述N个第二结束标记分别携带不同的源DRB的数据类别指示符，即N个第二结束标记是基于源DRB的，此外，源DRB与目标DRB是一一对应的，因此，上述生成的N个第二结束标记也是基于目标DRB的。
需要指出的是，当UE的多个源NG3路径共享一个源DRB时，图2所示的方法仍然适用。
采用上述实施例提供的发送结束标记的方法，源AN通过源NG3路径接收核心网用户面设备发送的第一结束标记，由源AN根据第一结束标记，生成基 于DRB的第二结束标记，并通过与DRB对应的转发路径发送给目标AN，从而解决了在DRB对核心网不可见的情况下核心网无法准确发送基于DRB的结束标记给目标AN的问题，避免了UE切换带来的下行数据乱序。
可选地，在上述实施例的第一种实施场景下，例如，源AN于目标AN之间可以直接通信的场景，在步骤201之前，上述方法还包括：
200a、源AN向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息。
其中，所述UE的源DRB信息可以包括：所述源DRB的(quality of service，QoS)信息，所述源DRB的ID，以及所述源DRB的数据类别指示符(data category indicator)；所述源NG3路径的信息可以包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
需要说明的是，所述数据类别指示符用于指示源DRB上允许传输的数据类别(data category)，可以用于确定DRB的QoS信息。具体地，数据类别可以是根据用户的签约数据，运营商的策略，收费策略或业务的属性等来划分的。例如，该数据类别指示符可以是流标识指示符(flow identification indicator，FII)，QoS分类识别码(QoS class identifier，QCI)或差分服务码点(differentiated services code point，DSCP)。
在上述实施场景下，源AN将第一切换请求消息发送给目标AN，用于目标AN根据第一切换请求消息建立转发路径，目标DRB以及目标NG3路径。
可选地，在上述实施例的第二种实施场景下，例如，源AN与目标AN之间不能直接通信的场景，在步骤201之前，上述方法还可以包括：
200b、源AN向所述核心网控制面设备发送第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息。
其中，所述源DRB信息可以包括：所述源DRB的QoS信息，所述源DRB的 标识(identifier，ID)，以及所述源DRB的数据类别指示符；所述源NG3路径的信息可以包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
具体地，上述数据类别指示符可以参见步骤200a中的相关描述，不再赘述。
进一步，结合上述第一种实施场景或第二种实施场景上述方法还可以包括：
200c、源AN接收所述核心网控制面设备发送的切换命令，所述切换命令携带所述转发路径在所述核心网用户面设备上的IP地址和隧道ID。
在上述实施场景下，源AN将携带第一容器的第二切换请求消息发送给核心网控制面设备，用于核心网控制面设备将该第一容器转发给目标AN，使得目标AN能够根据第一容器建立转发路径，目标DRB以及目标NG3路径。显然，核心网控制面设备还可以根据第二切换请求在核心网用户面设备上为转发路径分配资源。
如图3所示，本发明实施例提供了另一种发送结束标记的方法，具体如下所述。
301、目标AN通过转发路径接收源AN发送的第二结束标记。
其中，转发路径用于所述源AN将通过源NG3路径接收的UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应。
具体地，转发路径与源NG3路径一一对应，换言之，上述转发路径是基于源NG3路径的，即一个源NG3路径对应一个转发路径，转发路径用于传输其对应的源NG3路径上接收的UE的下行数据。
具体地，第二结束标记可以是源AN仅对第一结束标记中的路径相关信息进行修改生成的，例如，将第一结束标记中的源NG3路径的IP地址和隧道ID替换为转发路径的IP地址和隧道ID，因此，一个第一结束标记对应生成一个第二结束标记。
其中，第一结束标记，源NG3路径的IP地址和隧道ID以及转发路径的IP地 址和隧道ID可以参见步骤201-202中的相关描述，不再赘述。
302、目标AN根据所述第二结束标记，生成M个第三结束标记。
其中，所述M为所述转发路径对应的目标DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数据排序。
具体地，一个目标DRB存在一个与该目标DRB的第三结束标记，在目标AN处理第三结束标记时，用于辅助该第三结束标记对应的目标DRB上UE的下行数据排序。可见，第三结束标记是基于目标DRB的结束标记。
其中，M可以为1，即转发路径对应的目标DRB的个数为1，此时，一个转发路径对应一个目标DRB；M还可以为大于或等于2的整数，即转发路径对应的目标DRB的个数大于或等于2，此时，一个转发路径对应M个目标DRB。
可选地，上述步骤302具体可以采用如下两种方式实现：
方式一、目标AN根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记。
其中，所述转发路径与所述目标DRB两者之间的对应关系可以是所述转发路径的ID与所述目标DRB的ID之间的对应关系，具体可以采用列表的形式预先设置在目标AN内。
其中，转发路径的ID可以是转发路径的IP地址和隧道ID；目标DRB的ID用于标识DRB。
进一步地，转发路径的IP地址和隧道ID可以参见步骤202中的相关描述，不再赘述。
具体地，目标AN在接收第二结束标记时，可以获得传输该第二结束标记的转发路径的ID，使用获得的转发路径的ID查找所述转发路径的ID与所述目标DRB的ID之间的对应关系，可以获得与转发路径对应的目标DRB的ID；根据获得的目标DRB的ID生成该目标DRB对应的第三结束标记，或者生成与获得的目标DRB的ID对应的第三结束标记。
上述方式一可以应用于第二结束标记是基于源NG3路径的结束标记的场 景，目标AN根据基于源NG3路径的第二结束标记，生成基于目标DRB的第三结束标记，避免了核心网在DRB不可见的情况下无法生成并发送基于DRB的结束标记给目标AN所导致的目标DRB上下行数据乱序的问题。
方式二、目标AN根据所述转发路径，所述UE的ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
其中，目标AN根据所述转发路径，所述UE的ID和所述目标DRB三者之间的对应关系可以为转发路径的ID，目标DRB的ID以及UE的ID三者之间的对应关系。转发路径的ID，目标DRB的ID可以参见方式一中的相关描述，不再赘述。
具体地，目标AN在接收第二结束标记时，可以获得传输该第二结束标记的转发路径的ID和该UE的ID；根据获得的转发路径的ID和该UE的ID，可以查找上述对应关系，获得与该UE的转发路径对应的目标DRB的ID；根据获得的目标DRB的ID生成该目标DRB对应的第三结束标记，或者生成与获得的目标DRB的ID对应的第三结束标记。
需要指出的是，上述方式二应用于所述源NG3路径是基于AN的路径的场景，在该场景下，多个UE可以共享一个源NG3路径，为了识别源NG3路径上传输的结束标记归属的UE，第一结束标记可以根据UE的ID和源NG3路径的信息生成。通过上述方式二，目标AN根据第二结束标记，生成基于目标DRB的第三结束标记，避免了核心网在DRB不可见的情况下无法生成并发送基于DRB的结束标记给目标AN所导致的目标DRB上下行数据乱序的问题。
采用上述实施例提供的发送结束标记的方法，目标AN通过转发路径接收源AN发送的第二结束标记，目标AN根据第二结束标记，生成基于目标DRB的第三结束标记，解决核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN，从而避免了UE切换带来的下行数据乱序问题。
可选地，在上述实施例的第一种实施场景下，例如，源AN于目标AN之间可以直接通信的场景，在步骤301之前，上述方法还包括步骤300a-300d，如下 所述。
300a、目标AN接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息。
其中，所述UE的源DRB信息可以包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息可以包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
其中，数据类别指示符可以参见200a中的相关描述，不再赘述。
300b、目标AN根据所述源DRB信息，建立所述目标DRB。
具体地，根据源DRB的QoS信息，例如，速率，丢包率，优先级，建立目标DRB；步骤300b属于现有技术，不再赘述。
其中，源DRB与目标DRB可以为一一对应的。
300c、目标AN根据所述源NG3路径的信息，建立目标NG3路径。
具体地，目标AN在目标AN上为目标NG3路径分配IP地址和隧道ID，核心网用户面设备根据该分配的IP地址和隧道ID可以将数据发送到目标AN，目标AN根据源NG3路径在核心网用户面设备的IP地址和隧道ID可以将数据发送到核心网用户面设备，从而建立了目标NG3路径。显然，上述目标NG3路径的建立属于现有技术，不再赘述。
300d、目标AN为所述转发路径分配资源。
具体地，分配的资源可以包括所述转发路径在所述目标AN上的隧道ID和IP地址，源AN使用该分配的资源可以将数据发送给目标AN。由于转发路径与源NG3路径一一对应，因此，目标AN可以根据第一切换请求消息中携带的源NG3路径的信息，为与源NG3路径对应的转发路径分配资源。
需要指出的是，上述步骤300b-300d的执行先后顺序可以调整，本发明并不予限定。
进一步地，上述方法还可以包括：
300e、目标AN向所述源AN发送第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
进一步地，上述方法还可以包括：
300f、目标AN发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；其中，第一路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息。
具体地，目标NG3路径的信息可以包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；源NG3路径的ID具体可以是源NG3路径在源AN上的隧道ID，也可以是源NG3路径在核心网用户面设备上的隧道ID，不予限制。
其中，所述第一路径切换请求消息还可以携带有所述目标NG3路径的数据类别指示符列表。该数据类别指示符列表包含至少一个数据类别指示符，该至少一个数据类别指示符用于指示目标NG3路径上允许传输的数据类别。
可选地，在上述实施例的第二种实施场景下，例如，源AN与目标AN之间不能直接通信的场景，在步骤301之前，上述方法还包括步骤300′a-300′e，如下所述。
300′a、目标AN接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息。
其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。上述数据类别指示符可以参见200a中的相关描述，不再赘述。
300′b、目标AN根据所述源DRB信息，建立所述目标DRB。
300′c、目标AN根据所述源NG3路径的信息，建立目标NG3路径。
300′d、目标AN根据所述第三切换请求消息，为所述转发路径分配资源。
具体地，分配的资源可以包括所述转发路径在所述目标AN上的隧道ID和IP地址，核心网用户面设备使用该分配的资源可以将源AN发送的数据转发给目标AN。
300′e、目标AN向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述转发路径在所述目标AN上的的IP地址和隧道ID。
进一步地，上述方法还可以包括：
300′f、目标AN发送第二路径切换请求消息给所述核心网控制面设备，所述第二路径切换请求消息用于请求切换NG3路径。
其中，第二路径切换请求消息可以携带源NG3路径的ID，目标NG3路径的信息和NG2连接标识。具体地，源NG3路径的ID可以参见300e中的相关描述，目标NG3路径的信息可以包括目标NG3路径在所述目标AN上的IP地址和隧道ID，所述NG2连接标识用于指示所述UE切换完成。
如图4所示，本发明实施例提供了又一种发送结束标记的方法，具体如下所述。
401、核心网用户面设备接收核心网控制面设备发送的修改隧道请求消息。
其中，修改隧道请求消息携带源NG3路径的ID和目标NG3路径的信息，所述源NG3路径为源AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径为目标AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID。
具体地，源NG3路径的ID可以参见300e中的相关描述，不再赘述。
402、核心网用户面设备根据所述修改隧道请求消息，实现NG3路径的切换。
具体地，核心网用户面设备将存储的源NG3路径的源AN的IP地址和隧道ID，修改为目标AN的IP地址的隧道ID。
403、核心网用户面设备生成第一结束标记，并通过所述源NG3路径向所述源AN发送所述第一结束标记。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕。
具体地，上述步骤403中核心网用户面设备生成第一结束标记，可以采用如下实现方式：
方式一、核心网用户面设备根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同。
例如，根据路径切换请求消息中的源NG3路径的ID，确定源NG3路径的个数；然后根据确定的源NG3路径的个数，生成对应个数的第一结束标记。或者，路径切换请求消息中每一个NG3路径的ID，均生成一个对应的第一结束标记。
其中，第一结束标记可以携带有源NG3路径的IP地址和隧道ID。
方式二、核心网用户面设备根据所述目标NG3路径的数据类别指示符列表，生成所述第一结束标记，所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同。
其中，数据类别指示符可以参见200a中的相关描述，数据类别指示符列表可以参见300f中的相关描述，不再赘述。
其中，第一结束标记可以携带有源NG3路径的IP地址和隧道ID。
具体地，核心网用户面设备根据所述目标NG3路径的数据类别指示符列表和源NG3路径的ID，生成第一结束标记。
采用上述方式二，根据数据类别指示符生成结束标记，使得源AN或目标AN能够根据接收的结束标记中携带的数据类别指示符和传输该结束标记的路径的ID找到基于DRB的路径，例如，转发路径或目标DRB，从而生成基于DRB的结束标记。
方式三、核心网用户面设备根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
例如，根据路径切换请求消息中的源NG3路径的ID，确定源NG3路径的个 数；然后根据确定的源NG3路径的个数，生成对应个数的第一结束标记。
其中，第一结束标记还可以携带有源NG3路径的IP地址和隧道ID。
需要指出的是，上述源NG3路径的ID，UE的ID均可以参见步骤201中的相关描述；源NG3路径的IP地址和隧道ID可以包括源NG3路径在源AN上的IP地址和隧道ID，和/或，源NG3路径在核心网用户面设备上的IP地址和隧道ID。
采用上述方式三，根据所述UE的ID和所述源NG3路径的ID生成结束标记，使得源AN或目标AN能够根据接收的结束标记中所携带的UE的ID以及传输该结束标记的路径的ID找到对应的基于DRB的路径，例如，转发路径或目标DRB，从而生成基于DRB的结束标记。
可选地，结合上述步骤403的三种实现方式，所述修改隧道请求消息还可以携带有所述目标NG3路径的所述数据类别指示符列表，或者，所述UE的ID。
采用上述实施例提供的发送结束标记的方法，核心网用户面设备采用了多种方式生成第一结束标记，并将第一结束标记发送给源AN，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记，进而解决核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN，从而避免了UE切换带来的下行数据乱序的问题。
如图5所示，本发明实施例提供了再一种发送结束标记的方法，具体如下所述。
501、核心网控制面设备接收目标AN发送的路径切换请求消息。
其中，所述路径切换请求消息用于请求切换NG3路径，所述路径切换请求消息携带源NG3路径的ID和目标NG3路径的信息。
具体地，所述目标NG3路径的信息可以包括所述目标NG3路径在目标AN上的IP地址和隧道ID；源NG3路径的ID可以参见300e中的相关描述，不再赘述。
可选地，路径切换请求消息还携带有NG2连接标识，所述NG2连接标识用于指示UE切换完成；或者，路径切换请求还携带有所述目标NG3路径的数据类 别指示符列表，所述修改隧道请求消息还携带有所述目标NG3路径的数据类别指示符列表。
其中，数据类别指示符可以参见200a中的相关描述，数据类别指示符列表可以参见300f中的相关描述，不再赘述。
502、核心网控制面设备生成第一结束标记。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕。
具体地，步骤502可以采用如下方式实现：
方式一、核心网控制面设备根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同。
方式二、核心网控制面设备根据所述目标NG3路径的数据类别指示符列表，生成所述第一结束标记，所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同。
方式三、核心网控制面设备根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
需要指出的是，上述步骤502的方式一、方式二和方式三可以分别参考图4所示实施例中的方式一，方式二和方式三，不再赘述。
503、核心网控制面设备向核心网用户面设备发送修改隧道请求消息。
其中，修改隧道请求消息携带所述源NG3路径的ID，所述目标NG3路径的信息和所述第一结束标记。源NG3路径的ID和目标NG3路径的信息可以参见图2所示实施例中的相关描述。
采用上述实施例提供的发送结束标记的方法，核心网控制面设备采用了多种方式生成第一结束标记，并将第一结束标记通过核心网用户面设备发送给源AN，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记，进而解决DRB对核心网不可见的情况下无法准确发送基于DRB的结束标记给目标AN，从 而避免了UE切换带来的下行数据乱序问题。
可选地，在上述实施例的第一种实施场景下，在步骤501之前，上述方法还包括500a-500d，具体所下所述。
500a、核心网控制面设备接收所述源AN发送的第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和所述第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息。
其中，源DRB信息以及源NG3路径的信息可以参见300′a中的相关描述，不再赘述。
500b、核心网控制面设备根据所述转发路径的个数，为所述转发路径分配资源。
具体地，核心网控制面设备为转发路径分配资源，其中，分配的资源可以包括所述转发路径在核心网用户面设备上的隧道ID和IP地址，源AN使用该分配的资源可以将数据发送给核心网用户面设备。
其中，转发路径的个数可以为1，也可以为N，N为源DRB的个数。
500c、核心网控制面设备向所述目标AN发送第三切换请求，所述第三切换请求携带所述第一容器。
500d、核心网控制面设备接收所述目标AN发送的第二切换确认消息，所述第二切换确认消息携带所述转发路径在所述目标AN上的隧道ID和IP地址。
进一步地，上述方法还可以包括：
核心网控制面设备向所述源AN发送切换命令，所述切换命令携带所述转发路径在核心网用户面设备的IP地址和隧道ID。
进一步地，上述方法还可以包括：
核心网控制面设备向所述核心网用户面设备发送第一通知消息，所述第一通知消息用于通知所述核心网用户面设备所述转发路径的资源分配完毕。
如图6所示，本发明实施例提供了又一种发送结束标记的方法，该方法应用 于源AN和目标AN可以直接通信的场景，具体如下所述。
601、源AN发送切换请求消息给目标AN，所述切换请求消息携带源DRB信息和源NG3路径的信息。
其中，源DRB信息和源NG3路径的信息可以参见图2所示实施例中的相关描述，不再赘述。
602、目标AN接收切换请求消息，并根据接收的切换请求消息，建立目标DRB和目标NG3路径，并为转发路径分配资源。
其中，目标DRB和目标NG3路径的建立可以参见步骤300b，300c的描述，不再赘述。
需要说明的是，转发路径可以是基于源NG3路径的，即一个源NG3路径对应一个转发路径；也可以是基于源DRB或目标DRB的，例如，一个源NG3路径对应N个转发路径，其中，一个转发路径对应一个源DRB或目标DRB；具体可以由核心网控制面设备预先配置给源AN和/或目标AN，此处不予限制。下面根据转发路径的个数，划分如下两种情况：
情况1：转发路径的个数为1，即转发路径是基于源NG3路径的，步骤602中为转发路径分配资源可以参见步骤300d，不再赘述。
情况2：转发路径的个数为N，N为源DRB的个数，即转发路径是基于源DRB或目标DRB的，步骤602中为转发路径分配资源可以包括：
根据源DRB信息，为转发路径分配资源，例如，若源DRB信息中包含2个源DRB的ID，则对应分配2个转发路径的资源；或者，
根据目标DRB，为转发路径分配资源，例如，若目标DRB的个数为3个，则对应分配3个转发路径的资源。
603、目标AN发送切换确认消息给源AN。
其中，切换确认消息可以携带转发路径在目标AN上的IP地址和隧道ID。
604、源AN为转发路径分配资源。
具体地，源AN分配转发路径在源AN上的IP地址和隧道ID。
可选地，上述方法还包括：源AN保存以下至少一种对应关系：
转发路径与源NG3路径两者之间的对应关系；和
转发路径，UE的ID和源NG3路径三者之间的对应关系。
其中，上述对应关系可以参见图2所示实施例中的相关描述。
605、源AN发送切换命令给UE。
其中，切换命令用于通知UE进行切换。
606、若UE成功接入目标AN，则目标AN发送路径切换请求给核心网控制面设备。
例如，若目标AN接收到UE发送的RRC重配置完成(RRC reconfiguration complete)消息，则确定UE成功接入目标AN。
其中，路径切换请求消息用于请求切换NG3路径，路径切换请求消息可以携带源NG3路径的ID和所述目标NG3路径的信息。
具体地，目标NG3路径的信息可以包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；源NG3路径的ID具体可以是源NG3路径在源AN上的隧道ID，也可以是源NG3路径在核心网用户面设备上的隧道ID。
607、核心网控制面设备接收路径切换请求消息，并发送修改隧道请求消息给核心网用户面设备。
其中，路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息。
其中，修改隧道请求消息携带所述源NG3路径的ID和所述目标NG3路径的信息。具体地，源NG3路径的ID和目标NG3路径的信息可以参见图2所示实施例中的相关描述。
608、核心网用户面设备根据修改隧道请求消息，完成NG3路径的切换。
其中，步骤608可以参见步骤402的相关描述，不再赘述。
609、核心网用户面设备通过源NG3路径发送第一结束标记给源AN。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕，可以携带有源NG3路径的IP地址和隧道ID。
可选地，第一结束标记还可以携带有数据类别指示符或者UE的ID。例如，当源NG3是基于AN时，第一结束标记可以携带UE的ID。
具体地，第一结束标记可以由核心网用户面设备生成，例如，采用步骤403中的实现方式；第一结束标记也可以由核心网控制面设备生成，例如，采用步骤502中的实现方式，不再赘述。
需要说明的是，当第一结束标记是由核心网控制面设备生成时，上述方法还包括：核心网控制面设备将生成的第一结束标记发送给核心网用户面设备，例如，通过步骤607中的修改隧道请求消息将第一结束标记发送给核心网用户面设备。
610、源AN接收第一结束标记，并根据第一结束标记生成N个第二结束标记。
其中，针对步骤602中的情况1，步骤610生成的N个第二结束标记中第i个第二结束标记携带所述源NG3路径对应的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述源NG3路径对应的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。
针对步骤602中的情况2，步骤610具体可以根据第一结束标记和步骤604中源AN保存的对应关系，生成N个第二结束标记，具体可以参见图2所示实施例中步骤202的实现方式，不再赘述。
611、源AN通过转发路径发送N个第二结束标记给目标AN。
针对602中的情况1，源AN通过与源NG3路径一一对应的转发路径将N个第二结束标记发送给目标AN。目标AN可以将N个第二结束标记中携带的数据类别指示符与N个目标DRB的数据类别指示符进行匹配，获得目标DRB对应的第二结束标记，以辅助目标DRB上下行数据的排序。
针对602中的情况2，源AN通过N个转发路径分别将N个第二结束标记发送给目标AN。由于一个转发路径对应一个目标DRB，因此，一个目标DRB对应一 个第二结束标记。例如，假设第二结束标记包含编号从1到N的第二结束标记，且编号为1的转发路径与编号为1的目标DRB对应，那么当编号为1的第二结束标记通过编号为1的转发路径发给目标AN时，编号为1的第二结束标记就与编号为1的目标DRB对应，编号为1的第二结束标记用于该编号为1的目标DRB上UE的下行数据的排序。
612、目标AN接收核心网控制面设备发送的路径切换请求确认消息。
613、目标AN通知源AN释放UE的资源。
其中，上述的资源可以包括源DRB。
采用上述实施例提供的发送结束标记的方法，该方法应用于源AN与目标AN直接通信的场景，由源AN根据接收的结束标记生成基于目标DRB的N个第二结束标记，并发送给目标AN，以辅助目标DRB上UE的下行数据的排序，解决了核心网在DRB不可见的情况下无法准确发送基于目标DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序；此外，结束标记可以由核心网控制面设备或核心网用户面设备采用多种方式生成，使得源AN能够更加灵活地生成基于DRB的结束标记。
如图6a所示，本发明实施例提供了又一种发送结束标记的方法，该方法应用于源AN和目标AN可以直接通信的场景，具体如下所述。
601a、源AN发送切换请求消息给目标AN，所述切换请求消息携带源DRB信息和源NG3路径的信息。
其中，源DRB信息和源NG3路径的信息可以参见图2所示实施例中的相关描述，不再赘述。
602a、目标AN接收切换请求消息，并根据接收的切换请求消息，建立目标DRB和目标NG3路径，并为转发路径分配资源。
其中，目标DRB和目标NG3路径的建立可以参见步骤300b，300c的描述，不再赘述。
需要说明的是，转发路径是基于源NG3路径的，即一个源NG3路径对应一个转发路径。在目标AN侧，该转发路径对应M个目标DRB。
其中，步骤602a中为转发路径分配资源可以参见步骤300d，不再赘述。
可选地，上述步骤602a还包括：目标AN保存以下至少一种对应关系：
转发路径与目标DRB两者之间的对应关系；和
转发路径，UE的ID和目标DRB三者之间的对应关系。
其中，上述对应关系，以及数据类别指示符可以参见图3所示实施例中的相关描述。
603a、目标AN发送切换确认消息给源AN。
其中，切换确认消息可以携带转发路径在目标AN上的IP地址和隧道ID。
604a、源AN为转发路径分配资源。
具体地，源AN分配转发路径在源AN上的IP地址和隧道ID。
605a、源AN发送切换命令给UE。
其中，切换命令用于通知UE进行切换。
606a、若UE成功接入目标AN，则目标AN发送路径切换请求给核心网控制面设备。
例如，若目标AN接收到UE发送的RRC重配置完成(RRC reconfiguration complete)消息，则确定UE成功接入目标AN。
其中，路径切换请求消息用于请求切换NG3路径，路径切换请求消息可以携带源NG3路径的ID和所述目标NG3路径的信息。
具体地，目标NG3路径的信息可以包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；源NG3路径的ID具体可以是源NG3路径在源AN上的隧道ID，也可以是源NG3路径在核心网用户面设备上的隧道ID。
607a、核心网控制面设备接收路径切换请求消息，并发送修改隧道请求消息给核心网用户面设备。
其中，路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息。
其中，修改隧道请求消息携带所述源NG3路径的ID和所述目标NG3路径的信息。具体地，源NG3路径的ID和目标NG3路径的信息可以参见图2所示实施例中的相关描述。
608a、核心网用户面设备根据修改隧道请求消息，完成NG3路径的切换。
其中，步骤608a可以参见步骤402的相关描述，不再赘述。
609a、核心网用户面设备通过源NG3路径发送第一结束标记给源AN。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕，可以携带有源NG3路径的IP地址和隧道ID。
可选地，第一结束标记还可以携带有数据类别指示符或者UE的ID。例如，当源NG3是基于AN时，第一结束标记可以携带UE的ID。
具体地，第一结束标记可以由核心网用户面设备生成，例如，采用步骤403中的实现方式；第一结束标记也可以由核心网控制面设备生成，例如，采用步骤502中的实现方式，不再赘述。
需要说明的是，当第一结束标记是由核心网控制面设备生成时，上述方法还包括：核心网控制面设备将生成的第一结束标记发送给核心网用户面设备，例如，通过步骤607a中的修改隧道请求消息将第一结束标记发送给核心网用户面设备。
610a、源AN接收第一结束标记，并根据第一结束标记生成第二结束标记。
具体地，第二结束标记可以是源AN仅对第一结束标记中的路径相关信息进行修改生成的，例如，将第一结束标记中的源NG3路径的IP地址和隧道ID替换为转发路径的IP地址和隧道ID，因此，一个第一结束标记对应生成一个第二结束标记。
611a、源AN通过转发路径发送第二结束标记给目标AN。
612a、目标AN接收第二结束标记，根据第二结束标记生成M个第三结束标记。
需要指出的是，M为转发路径对应的目标DRB的个数。
具体地，可以根据步骤602a中源AN保存的对应关系和第二结束标记，生成M个第三结束标记可以参见步骤302中的相关描述。
613a、目标AN接收核心网控制面设备发送的路径切换请求确认消息。
614a、目标AN通知源AN释放UE的资源。
其中，上述的资源可以包括源DRB。
采用上述实施例提供的发送结束标记的方法，该方法应用于源AN与目标AN直接通信的场景，由目标AN根据接收的结束标记生成基于目标DRB的结束标记，以辅助目标DRB上下行数据的排序，解决了核心网在DRB不可见的情况下无法准确发送基于目标DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序；此外，结束标记可以由核心网控制面设备或核心网用户面设备采用多种方式生成，使得目标AN能够更加灵活地生成基于DRB的结束标记。
如图7所示，本发明实施例提供了又一种发送结束标记的方法，该方法应用于源AN和目标AN可以通过核心网用户面设备进行间接通信的场景，具体如下所述。
701、源AN向核心网控制面设备发送第一切换请求消息。
其中，第一切换请求消息携带转发路径的个数和第一容器。
其中，第一容器可以参见步骤300′a中的相关描述，不再赘述。
702、核心网控制面设备根据第一切换请求中的转发路径的个数为转发路径分配资源。
具体地，可以参见步骤500b的相关描述。
703、核心网控制面设备发送第二切换请求消息给目标AN，第二切换请求携带第一容器。
704、目标AN根据第二切换请求消息，建立目标DRB和目标NG3路径，并为转发路径分配资源。
具体地，目标AN根据第一容器建立目标DRB和目标NG3路径，例如，目标AN根据第一容器中的源DRB信息建立目标DRB，目标DRB的个数与源DRB的个数相同，可以参见步骤300b的相关描述；目标AN根据第一容器中源NG3路径的信息，建立目标NG3路径，可以参见步骤300c的相关描述。
需要说明的是，转发路径可以是基于源NG3路径的，也可以是基于源DRB或目标DRB的，具体可以由核心网控制面设备预先配置给源AN和/或目标AN，参见步骤602中的相关描述，不再赘述。
情况1：转发路径的个数为1，即转发路径是基于源NG3路径的，步骤704中为转发路径分配资源可以参见步骤300d，不再赘述。
情况2：转发路径的个数为N，N为源DRB的个数，即转发路径是基于源DRB或目标DRB的，步骤704中为转发路径分配资源可以包括：
根据源DRB信息，为转发路径分配资源，例如，源DRB信息中的一个源DRB的ID，对应分配一个转发路径的资源；或者，
根据目标DRB，为转发路径分配资源，例如，一个目标DRB对应分配一个转发路径的资源。
705、目标AN发送切换确认消息给核心网控制面设备。
其中，切换确认消息携带转发路径在目标AN上的IP地址和隧道ID。
706、核心网控制面设备接收目标AN发送的切换确认消息，向核心网用户面设备发送通知消息。
其中，通知消息携带转发路径在目标AN上的IP地址和隧道ID。
707、核心网控制面设备发送第一切换命令给源AN。
其中，第一切换命令携带转发路径在核心网用户面设备上的IP地址和隧道ID。
708、源AN接收第一切换命令，为转发路径在源AN上分配资源。
可选地，上述方法还包括：源AN保存以下至少一种对应关系：
转发路径与源NG3路径两者之间的对应关系；和
转发路径，UE的ID和源NG3路径三者之间的对应关系。
其中，上述对应关系可以参见图2所示实施例中的相关描述。
709、源AN发送第二切换命令给UE。
其中，第二切换命令用于通知UE进行切换。
710、若UE成功接入目标AN，则目标AN发送路径切换请求消息给核心网控制面设备。
例如，若目标AN接收到UE发送的RRC重配置完成消息，则确定UE成功接入目标AN。
其中，路径切换请求消息携带NG2连接标识，源NG3路径的ID和目标NG3路径的信息。源NG3路径的ID可以是源NG3路径的IP地址和隧道ID，源NG3路径的IP地址和隧道ID可以参见步骤201中的相关描述，不再赘述。
711、核心网控制面设备发送修改隧道请求消息给核心网用户面设备。
其中，修改隧道请求消息携带目标NG3路径的信息和源NG3路径的ID。
712、核心网用户面设备根据修改隧道请求消息，完成NG3路径的切换。
其中，步骤712可以参见步骤402的相关描述，不再赘述。
713、核心网用户面设备发送修改隧道响应消息给核心网控制面设备。
714、核心网用户面设备通过源NG3路径发送第一结束标记给源AN。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕，可以携带有源NG3路径的IP地址和隧道ID。
可选地，第一结束标记还可以携带有数据类别指示符或者UE的ID。例如，当源NG3是基于AN时，第一结束标记可以携带UE的ID。
具体地，第一结束标记可以由核心网用户面设备生成，例如，采用步骤403中的实现方式；第一结束标记也可以由核心网控制面设备生成，例如，采用步骤502中的实现方式，不再赘述。
需要说明的是，当第一结束标记是由核心网控制面设备生成时，上述方法还包括：核心网控制面设备将生成的第一结束标记发送给核心网用户面设备， 例如，通过步骤711中的修改隧道请求消息将第一结束标记发送给核心网用户面设备。
715、源AN根据第一结束标记，生成N个第二结束标记。
其中，针对步骤704中的情况1，步骤715中生成的N个第二结束标记中第i个第二结束标记携带所述UE的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述UE的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。
针对步骤704中的情况2，步骤715具体可以根据第一结束标记和步骤708中源AN保存的对应关系，生成N个第二结束标记，具体可以参见图2所示实施例中步骤202的实现方式，不再赘述。
716、源AN通过转发路径发送N个第二结束标记给目标AN。
针对704中的情况1，源AN通过与源NG3路径一一对应的转发路径将N个第二结束标记发送给目标AN。目标AN可以将N个第二结束标记中携带的数据类别指示符与N个目标DRB的数据类别指示符进行匹配，获得目标DRB对应的第二结束标记，以辅助目标DRB上下行数据的排序。
针对704中的情况2，源AN通过N个转发路径分别将N个第二结束标记发送给目标AN，由于转发路径是基于源DRB或目标DRB的，一个转发路径对应一个目标DRB，因此，一个目标DRB对应一个第二结束标记。例如，假设第二结束标记包含编号从1到N的第二结束标记，且编号为1的转发路径与编号为1的目标DRB对应，那么当编号为1的第二结束标记通过编号为1的转发路径发给目标AN时，编号为1的第二结束标记就与编号为1的目标DRB对应，编号为1的第二结束标记用于该编号为1的目标DRB上UE的下行数据的排序。
717、核心网控制面设备通知源AN释放UE的资源。
其中，上述的资源可以包括源DRB。
采用上述实施例提供的发送结束标记的方法，该方法应用于源AN与目标 AN间接通信的场景，由源AN根据接收的结束标记生成基于目标DRB的N个第二结束标记，并发送给目标AN，以辅助目标DRB上下行数据的排序，解决了核心网在DRB不可见的情况下无法准确发送基于目标DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序；此外，结束标记可以由核心网控制面设备或核心网用户面设备采用多种方式生成，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记。
如图7a所示，本发明实施例提供了又一种发送结束标记的方法，该方法应用于源AN和目标AN可以通过核心网用户面设备进行间接通信的场景，具体如下所述。
701a、源AN向核心网控制面设备发送第一切换请求消息。
其中，第一切换请求消息携带转发路径的个数和第一容器。
其中，第一容器可以参见步骤300′a中的相关描述，不再赘述。
702a、核心网控制面设备根据第一切换请求中的转发路径的个数为转发路径分配资源。
其中，转发路径的个数为1，即一个转发路径与一个源NG3路径对应。
具体地，可以参见步骤500b的相关描述。
703a、核心网控制面设备发送第二切换请求消息给目标AN，第二切换请求携带第一容器。
704a、目标AN根据第二切换请求消息，建立目标DRB和目标NG3路径，并为转发路径分配资源。
具体地，目标AN根据第一容器建立目标DRB和目标NG3路径，例如，目标AN根据第一容器中的源DRB信息建立目标DRB，目标DRB的个数与源DRB的个数相同，可以参见步骤300b的相关描述；目标AN根据第一容器中源NG3路径的信息，建立目标NG3路径，可以参见步骤300c的相关描述。
其中，步骤704a中为转发路径分配资源可以参见步骤300d，不再赘述。
可选地，步骤704a还包括：目标AN保存以下至少一种对应关系：
转发路径与目标DRB两者之间的对应关系；和
转发路径，UE的ID和目标DRB三者之间的对应关系。
其中，上述对应关系，以及数据类别指示符可以参见图3所示实施例中的相关描述。
705a、目标AN发送切换确认消息给核心网控制面设备。
其中，切换确认消息携带转发路径在目标AN上的IP地址和隧道ID。
706a、核心网控制面设备接收目标AN发送的切换确认消息，向核心网用户面设备发送通知消息。
其中，通知消息携带转发路径在目标AN上的IP地址和隧道ID。
707a、核心网控制面设备发送第一切换命令给源AN。
其中，第一切换命令携带转发路径在核心网用户面设备上的IP地址和隧道ID。
708a、源AN接收第一切换命令，为转发路径在源AN上分配资源。
709a、源AN发送第二切换命令给UE。
其中，第二切换命令用于通知UE进行切换。
710a、若UE成功接入目标AN，则目标AN发送路径切换请求消息给核心网控制面设备。
例如，若目标AN接收到UE发送的RRC重配置完成消息，则确定UE成功接入目标AN。
其中，路径切换请求消息携带NG2连接标识，源NG3路径的ID和目标NG3路径的信息。源NG3路径的ID可以是源NG3路径的IP地址和隧道ID，源NG3路径的IP地址和隧道ID可以参见步骤201中的相关描述，不再赘述。
711a、核心网控制面设备发送修改隧道请求消息给核心网用户面设备。
其中，修改隧道请求消息携带目标NG3路径的信息和源NG3路径的ID。
712a、核心网用户面设备根据修改隧道请求消息，完成NG3路径的切换。
其中，步骤712a可以参见步骤402的相关描述，不再赘述。
713a、核心网用户面设备发送修改隧道响应消息给核心网控制面设备。
714a、核心网用户面设备通过源NG3路径发送第一结束标记给源AN。
其中，第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕，可以携带有源NG3路径的IP地址和隧道ID。
可选地，第一结束标记还可以携带有数据类别指示符或者UE的ID。例如，当源NG3是基于AN时，第一结束标记可以携带UE的ID。
具体地，第一结束标记可以由核心网用户面设备生成，例如，采用步骤403中的实现方式；第一结束标记也可以由核心网控制面设备生成，例如，采用步骤502中的实现方式，不再赘述。
需要说明的是，当第一结束标记是由核心网控制面设备生成时，上述方法还包括：核心网控制面设备将生成的第一结束标记发送给核心网用户面设备，例如，通过步骤711a中的修改隧道请求消息将第一结束标记发送给核心网用户面设备。
715a、源AN根据第一结束标记，生成第二结束标记。
具体地，第二结束标记可以是源AN仅对第一结束标记中的路径相关信息进行修改生成的，例如，将第一结束标记中的源NG3路径的IP地址和隧道ID替换为转发路径的IP地址和隧道ID；一个第一结束标记对应生成一个第二结束标记。
716a、源AN通过转发路径发送第二结束标记给目标AN。
具体地，源AN通过与源NG3路径一一对应的转发路径将第二结束标记发送给目标AN。
717a、目标AN接收第二结束标记，根据第二结束标记生成M个第三结束标记。
需要指出的是，M为上述转发路径对应的目标DRB的个数。
具体地，步骤717a可以根据第二结束标记和步骤704a中目标AN保存的对应关系，生成M个第三结束标记，具体可以参见步骤302中的相关描述。
718a、核心网控制面设备通知源AN释放UE的资源。
其中，上述的资源可以包括源DRB。
采用上述实施例提供的发送结束标记的方法，该方法应用于源AN与目标AN间接通信的场景，由目标AN根据接收的结束标记生成基于目标DRB的结束标记，以辅助目标DRB上下行数据的排序，解决核心网在DRB不可见的情况下无法准确发送基于目标DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序；此外，结束标记可以由核心网控制面设备或核心网用户面设备采用多种方式生成，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记。
如图8所示，本发明实施例提供了一种源AN，可以用于执行图2或6或7所示实施例中源AN的动作。该源AN具体可以包括：接收单元801，生成单元802和发送单元803，具体如下所述。
接收单元801，用于通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记，所述第一结束标记用于指示UE的下行数据在所述源NG3路径上发送完毕；
生成单元802，用于根据接收单元801接收的所述第一结束标记，生成N个第二结束标记，所述N为所述源NG3路径对应的源DRB的个数；
发送单元803，用于通过所述源NG3路径对应的转发路径发送生成单元802生成的所述N个第二结束标记给目标AN，所述转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。
可选地，在一种实施场景下，发送单元803还用于：
在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源数据无线承载DRB信息和所述源NG3路径的信息；
其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的标识ID，以及所述源DRB的数据类别指示符；
所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
进一步地，接收单元801还可以用于：
接收所述目标AN的第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
可选地，在另一种实施场景下，发送单元801还用于：
在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向核心网控制面设备发送第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
进一步地，接收单元801还可以用于：
接收所述核心网控制面设备发送的切换命令，所述切换命令携带所述转发路径在所述核心网用户面设备上的IP地址和隧道ID。
可选地，所述转发路径的个数为1，所述N个第二结束标记中第i个第二结束标记携带所述源NG3路径对应的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述源NG3路径对应的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。
可选地，所述转发路径的个数为N，生成单元802具体可以用于：
根据所述转发路径与所述源NG3路径两者之间的对应关系和所述第一结束 标记，生成所述N个第二结束标记；或者，
根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID；或者，
根据所述转发路径的ID，数据类别指示符和所述源NG3路径的ID三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带数据类别指示符。
其中，根据所述转发路径的ID，数据类别指示符和所述源NG3路径的ID三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，可以包括：
根据所述第一结束标记携带的数据类别指示符以及所述源NG3路径的ID，查找所述转发路径的ID，数据类别指示符和所述源NG3路径的ID三者之间的对应关系，获得与所述数据类别指示符以及所述源NG3路径的ID对应的转发路径的ID；
根据所述获得的转发路径的ID，生成所述第二结束标记。
需要指出的是，上述名词的含义以及动作的细化，例如，第一结束标记，第二结束标记和数据类别指示符等，均可以参见2或6或7所示实施例中的相关描述，不再赘述。
采用上述实施例提供的源AN，根据通过源NG3路径接收的核心网用户面设备发送的第一结束标记，生成基于DRB的第二结束标记，并通过与DRB对应的转发路径发送给目标AN，以辅助目标DRB上下行数据的排序，解决了核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN的问题，避免了UE切换带来的下行数据乱序。
如图9所示，本发明实施例提供了一种目标AN，可以用于执行图3或6a或7a所示实施例中目标AN的动作，该AN具体可以包括：接收单元901和生成单元 902，如下所述。
接收单元901，用于接收源AN发送的第二结束标记，所述转发路径用于所述源AN将通过源NG3路径接收的UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应；
生成单元902，用于根据接收单元901接收的所述第二结束标记，生成M个第三结束标记，所述M为所述转发路径对应的目标DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数据排序。
可选地，生成单元902具体可以用于：
根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记；或者，
根据所述转发路径，用户设备UE的标识ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
可选地，在一种实施场景下，目标AN还包括：第一处理单元903；
接收单元901，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；
第一处理单元903，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并为所述转发路径分配资源；
其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
可选地，上述目标AN还包括：
第一发送单元904，用于向所述源AN发送第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
可选地，上述目标AN还包括：
第二发送单元905，用于发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；
其中，所述第一路径切换请求消息携带源NG3路径的ID和所述目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID。
其中，所述第一路径切换请求消息还可以携带有所述目标NG3路径的数据类别指示符列表。
可选地，在第二种实施场景下，上述目标AN还包括：第二处理单元906和第三发送单元907；
接收单元901，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
第二处理单元906，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并根据所述第三切换请求消息，为所述转发路径分配资源；
第三发送单元907，用于向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述目标AN的转发路径信息；
其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
其中，第三发送单元907还可以用于：
发送第二路径切换请求消息给所述核心网控制面设备，所述第二路径切换请求消息用于请求切换NG3路径；
其中，所述第二路径切换请求消息携带源NG3路径的ID，所述目标NG3路 径的信息和NG2连接标识，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID，所述NG2连接标识用于指示所述UE切换完成。
需要指出的是，上述名词的含义以及动作的细化，例如，第三结束标记，NG2连接标识和数据类别指示符等，均可以参见3或6a或7a所示实施例中的相关描述，不再赘述。
采用上述实施例提供的目标AN，根据通过转发路径接收的源AN发送的第二结束标记，生成基于目标DRB的第三结束标记，以辅助目标DRB上UE的下行数据的排序，解决了核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN的问题，从而避免了UE切换带来的下行数据乱序。
如图10所示，本发明实施例提供了一种核心网用户面设备，可以用于执行图4或6-7a所示的任一实施例中核心网用户面设备的动作，该设备具体可以包括
接收单元1001，用于接收核心网控制面设备发送的修改隧道请求消息，所述修改隧道请求消息携带源NG3路径的ID和目标NG3路径的信息，所述源NG3路径为源接入节点AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径为目标AN与所述核心网用户面设备之间的传输路径，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；
切换单元1002，用于根据所述修改隧道请求消息，实现NG3路径的切换；
生成单元1003，用于生成第一结束标记，并通过所述源NG3路径向所述源AN发送所述第一结束标记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕。
可选地，生成单元1003具体用于：
根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同；或者，
根据所述目标NG3路径的数据类别指示符列表，生成所述第一结束标记， 所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同；或者，
根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
其中，所述修改隧道请求消息还可以携带有所述目标NG3路径的所述数据类别指示符列表，或者，所述UE的ID。
需要指出的是，上述名词的含义以及动作的细化，例如，第一结束标记和数据类别指示符等，均可以参见4或6-7a所示实施例中的相关描述，不再赘述。
采用上述实施例提供的核心网用户面设备，采用了多种方式生成第一结束标记，并将第一结束标记发送给源AN，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记，进而解决核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN，从而避免了UE切换带来的下行数据乱序问题。
如图11所示，本发明实施例提供了一种核心网控制面设备，可以用于执行图5-7a所示任一实施中核心网控制面设备的动作，该设备可以包括：接收单元1101，生成单元1102和发送单元1103，具体如下所述。
接收单元1101，用于接收目标接入节点AN发送的路径切换请求消息，所述路径切换请求消息用于请求切换NG3路径，所述路径切换请求消息携带源NG3路径的ID和目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID；
生成单元1102，用于生成第一结束标记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕；
发送单元1103，用于向核心网用户面设备发送修改隧道请求消息，所述修改隧道请求消息携带所述源NG3路径的ID，所述目标NG3路径的信息和所述第一结束标记。
可选地，生成单元1102具体用于：
根据所述源NG3路径的ID生成所述第一结束标记，所述第一结束标记的个数与所述源NG3路径的个数相同；或者，
根据所述目标NG3路径的数据类别指示符列表，生成所述第一结束标记，所述第一结束标记的个数与所述数据类别指示符列表包含的数据类别指示符的个数相同；或者，
根据所述UE的ID和所述源NG3路径的ID，生成所述第一结束标记，所述第一结束标记携带所述UE的ID，所述第一结束标记的个数与所述源NG3路径的个数相同。
可选地，路径切换请求消息还携带有NG2连接标识，所述NG2连接标识用于指示UE切换完成；或者，
路径切换请求还携带有所述目标NG3路径的数据类别指示符列表，所述修改隧道请求消息还携带有所述目标NG3路径的数据类别指示符列表。
可选地，上述核心网控制面设备还包括处理单元1104；
接收单元1101还用于：在接收目标AN发送的路径切换请求消息之前，接收所述源AN发送的第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和所述第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
处理单元1104，用于根据所述转发路径的个数，为所述转发路径分配资源；
发送单元1103，还用于向所述目标AN发送第三切换请求，所述第三切换请求携带所述第一容器；
接收单元1101，还用于接收所述目标AN发送的第二切换确认消息，所述第二切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
可选地，发送单元1103还用于：
向所述源AN发送切换命令，所述切换命令携带所述转发路径在核心网用户面设备的IP地址和隧道ID。
可选地，发送单元1103还用于：
向所述核心网用户面设备发送第一通知消息，所述第一通知消息用于通知所述核心网用户面设备所述转发路径的资源分配完毕。
需要指出的是，上述名词的含义以及动作的细化，例如，第一结束标记和数据类别指示符等，均可以参见图5-7a所示实施例中的相关描述，不再赘述。
采用上述实施例提供的核心网控制面设备，采用了多种方式生成第一结束标记，并将第一结束标记通过核心网用户面设备发送给源AN，使得源AN或目标AN能够更加灵活地生成基于DRB的结束标记，进而解决核心网在DRB不可见的情况下无法准确发送基于DRB的结束标记给目标AN，从而避免了UE切换带来的下行数据乱序问题。
如图12所示，本发明实施例提供了一种源AN，该源AN可以包括：处理器1201，存储器1202，通信接口1203以及收发器1204，如下所述。
存储器1202，用于存储程序；
处理器1201，用于执行存储器1202中存储的程序，以实现图2或6或7所示实施例中源AN的动作，不再赘述。
需要说明的是，在图2或6或7所示实施例中，源AN发送给目标AN或核心网控制面设备或核心网用户面设备的消息均可以通过通信接口1203来发送；源AN也可以通过通信接口1203接收目标AN或核心网控制面设备或核心网用户面设备发送给源AN的消息；此外，源AN发送给UE的消息可以通过收发器1204来发送，源AN也可以通过收发器1204接收UE发送给源AN的消息。
如图13所示，本发明实施例提供了一种目标AN，该目标AN具体可以包括：处理器1301，存储器1302，通信接口1303和收发器1304，如下所述。
存储器1302，用于存储程序；
处理器1301，用于执行存储器1302中存储的程序，以实现图2或6a或7a所示实施例中目标AN的动作，不再赘述。
需要说明的是，在图2或6a或7a所示实施例中，目标AN发送给源AN或核心 网控制面设备或核心网用户面设备的消息均可以通过通信接口1303来发送；目标AN也可以通过通信接口1203接收源AN或核心网控制面设备或核心网用户面设备发送给目标AN的消息；此外，目标AN发送给UE的消息可以通过收发器1304来发送，目标AN也可以通过收发器1304接收UE发送给目标AN的消息。
如图14所示，本发明实施例提供了一种核心网用户面设备，该核心网用户面设备可以包括：处理器1401，存储器1402和通信接口1403，如下所述。
存储器1402，用于存储程序；
处理器1401，用于执行存储器1402中存储的程序，以实现图4或6-7a所示的任一实施例中核心网用户面设备的动作，不再赘述。
需要说明的是，核心网用户面设备发送给源AN或核心网控制面设备的消息均可以通过通信接口1403来发送；核心网用户面设备也可以通过通信接口1403接收源AN或核心网控制面设备发送给核心网用户面设备的消息。
如图15所示，本发明实施例提供了一种核心网控制面设备，包括：处理器1501，存储器1502和通信接口1503，如下所述。
存储器1502，用于存储程序；
处理器1501，用于执行存储器1502中存储的程序，以实现图5-7a所示任一实施中核心网控制面设备的动作，不再赘述。
需要说明的是，核心网控制面设备发送给源AN或核心网用户面设备或目标AN的消息均可以通过通信接口1503来发送；核心网控制面设备也可以通过通信接口1403接收源AN或核心网用户面设备或目标AN发送给核心网控制面设备的消息。
本发明还提供了一种通信系统，该系统可以包括图8所示的源AN，图10所示的核心网用户面设备，以及图11所示的核心网控制面设备。此外，该系统还可以包括目标AN，用于接收源AN发送的N个第二结束标记；该目标AN还可以用于使用第二结束标记对目标DRB上的UE下行数据进行排序。
需要说明的是，上述系统中各个网元执行的动作可以参见图6或图7所示实 施例。
本发明还提供了另一种通信系统，该系统可以应用于转发路径与源NG3路径一一对应的场景下，具体可以包括图9所示的目标AN，图10所示的核心网用户面设备，以及图11所示的核心网控制面设备。此外，该系统还可以包括源AN，用于接收核心网用户面设备发送的第一结束标记，根据第一结束标记生成第二结束标记，并通过与源NG3路径对应的转发路径将第二结束标记发送给目标AN。
需要说明的是，上述系统中各个网元执行的动作可以参见图6a或图7a所示实施例。
本领域普通技术人员可以理解：实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成，前述的程序可以存储于计算机可读取存储介质中，该程序在执行时，执行包括上述方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (30)

  1. 一种发送结束标记end marker的方法，其特征在于，所述方法包括：
    源接入节点AN通过所述源AN与核心网用户面设备之间的源下一代NG3路径接收所述核心网用户面设备发送的第一结束标记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕；
    所述源AN根据所述第一结束标记，生成N个第二结束标记，所述N为所述所述源NG3路径对应的源数据无线承载DRB的个数；
    所述源AN通过所述源NG3路径对应的转发路径发送所述N个第二结束标记给目标AN，所述转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。
  2. 根据权利要求1所述的方法，其特征在于，在所述源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，所述方法还包括：
    所述源AN向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；
    其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的标识ID，以及所述源DRB的数据类别指示符；
    所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    所述源AN接收所述目标AN的第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
  4. 根据权利要求1所述的方法，其特征在于，在所述源AN通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，所述方法还包括：
    所述源AN向核心网控制面设备发送第二切换请求消息，所述第二切换请求 消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
    其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    所述源AN接收所述核心网控制面设备发送的切换命令，所述切换命令携带所述转发路径在所述核心网用户面设备上的IP地址和隧道ID。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述转发路径的个数为N，所述源AN根据所述第一结束标记，生成N个第二结束标记，包括：
    所述源AN根据所述转发路径与所述源NG3路径两者之间的对应关系和所述第一结束标记，生成所述N个第二结束标记；或者，
    所述源AN根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID。
  7. 根据权利要求1-5所述方法，其特征在于，所述转发路径的个数为1，所述N个第二结束标记中第i个第二结束标记携带所述源NG3路径对应的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述源NG3路径对应的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。
  8. 一种发送结束标记end marker的方法，其特征在于，所述方法包括：
    目标接入节点AN通过转发路径接收源AN发送的第二结束标记，所述转发路径用于所述源AN将通过源下一代NG3路径接收的用户设备UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应；
    所述目标AN根据所述第二结束标记，生成M个第三结束标记，所述M为所 述转发路径对应的目标无线数据承载DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数据排序。
  9. 根据权利要求8所述的方法，其特征在于，所述目标AN根据所述第二结束标记，生成M个第三结束标记，包括：
    所述目标AN根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记；或者，
    所述目标AN根据所述转发路径，用户设备UE的标识ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
  10. 根据权利要求8或9所述的方法，其特征在于，在所述目标AN通过转发路径接收源AN发送的第二结束标记之前，所述方法还包括：
    所述目标AN接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；
    所述目标AN根据所述源DRB信息，建立所述目标DRB；
    所述目标AN根据所述源NG3路径的信息，建立目标NG3路径；
    所述目标AN为所述转发路径分配资源；
    其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述目标AN向所述源AN发送第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
  12. 根据权利要求10或11所述的方法，其特征在于，所述方法还包括：
    所述目标AN发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；
    其中，所述第一路径切换请求消息携带所述源NG3路径的ID和所述目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID。
  13. 根据权利要求12所述的方法，其特征在于，所述第一路径切换请求消息还携带有所述目标NG3路径的数据类别指示符列表。
  14. 根据权利要求8或9所述的方法，其特征在于，在所述目标AN通过转发路径接收源AN发送的第二结束标记之前，所述方法还包括：
    所述目标AN接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
    所述目标AN根据所述源DRB信息，建立所述目标DRB；
    所述目标AN根据所述源NG3路径的信息，建立目标NG3路径；
    所述目标AN根据所述第三切换请求消息，为所述转发路径分配资源；
    所述目标AN向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述目标AN的转发路径信息；
    其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  15. 根据权利要求14所述的方法，其特征在于，所述方法还包括：
    所述目标AN发送第二路径切换请求消息给所述核心网控制面设备，所述第二路径切换请求消息用于请求切换NG3路径；
    其中，所述第二路径切换请求消息携带所述源NG3路径的ID，所述目标NG3路径的信息和NG2连接标识，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID，所述NG2连接标识用于指示所述UE切换完成。
  16. 一种源接入节点AN，其特征在于，包括：
    接收单元，用于通过所述源AN与核心网用户面设备之间的源下一代NG3路径接收所述核心网用户面设备发送的第一结束标记，所述第一结束标记用于指示用户设备UE的下行数据在所述源NG3路径上发送完毕；
    生成单元，用于根据所述接收单元接收的所述第一结束标记，生成N个第二结束标记，所述N为所述源NG3路径对应的源数据无线承载DRB的个数；
    发送单元，用于通过所述源NG3路径对应的转发路径发送所述生成单元生成的所述N个第二结束标记给目标AN，所述转发路径用于所述源AN将通过所述源NG3路径接收的所述UE的数据转发至所述目标AN。
  17. 根据权利要求16所述的源AN，其特征在于，所述发送单元还用于：
    在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向所述目标AN发送第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；
    其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的标识ID，以及所述源DRB的数据类别指示符；
    所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  18. 根据权利要求17所述的源AN，其特征在于，所述接收单元还用于：
    接收所述目标AN的第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
  19. 根据权利要求16所述的源AN，其特征在于，所述发送单元还用于：
    在通过所述源AN与核心网用户面设备之间的源NG3路径接收所述核心网用户面设备发送的第一结束标记之前，向核心网控制面设备发送第二切换请求消息，所述第二切换请求消息携带所述转发路径的个数和第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
    其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的 ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  20. 根据权利要求19所述的源AN，其特征在于，所述接收单元还用于：
    接收所述核心网控制面设备发送的切换命令，所述切换命令携带所述转发路径在所述核心网用户面设备上的IP地址和隧道ID。
  21. 根据权利要求16-20任一项所述的源AN，其特征在于，所述转发路径的个数为N，所述生成单元具体用于：
    根据所述转发路径与所述源NG3路径两者之间的对应关系和所述第一结束标记，生成所述N个第二结束标记；或者，
    根据所述转发路径，所述UE的ID和所述源NG3路径三者之间的对应关系，以及所述第一结束标记，生成所述N个第二结束标记，所述第一结束标记携带所述UE的ID。
  22. 根据权利要求16-20任一项所述的源AN，其特征在于，所述转发路径的个数为1，所述N个第二结束标记中第i个第二结束标记携带所述源NG3路径对应的源DRB中第x个源DRB的数据类别指示符，1≤i≤N，1≤x≤N，所述N个第二结束标记中第j个第二结束标记携带所述源NG3路径对应的源DRB中第y个源DRB的数据类别指示符，1≤j≤N，1≤y≤N，其中，i，j，x和y均为整数，且i不等于j，x不等于y。
  23. 一种目标接入节点AN，其特征在于，包括：
    接收单元，用于接收源AN发送的第二结束标记，所述转发路径用于所述源AN将通过源下一代NG3路径接收的用户设备UE的数据转发至所述目标AN，所述转发路径与所述源NG3路径一一对应；
    生成单元，用于根据所述接收单元接收的所述第二结束标记，生成M个第三结束标记，所述M为所述转发路径对应的目标数据无线承载DRB的个数，所述第三结束标记用于在所述第三结束标记对应的目标DRB上所述UE的下行数 据排序。
  24. 根据权利要求23所述的方法，其特征在于，所述生成单元具体用于：
    根据所述转发路径与所述目标DRB两者之间的对应关系和所述第二结束标记，生成所述M个第三结束标记；或者，
    根据所述转发路径，用户设备UE的标识ID和所述目标DRB三者之间的对应关系，以及所述第二结束标记，生成所述M个第三结束标记，所述第二结束标记携带所述UE的ID。
  25. 根据权利要求23或24所述的目标AN，其特征在于，还包括：第一处理单元；
    所述接收单元，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收所述源AN发送的第一切换请求消息，所述第一切换请求消息携带所述UE的源DRB信息和所述源NG3路径的信息；
    所述第一处理单元，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并为所述转发路径分配资源；
    其中，所述UE的源DRB信息包括：所述源DRB的服务质量QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  26. 根据权利要求25所述的目标AN，其特征在于，还包括：
    第一发送单元，用于向所述源AN发送第一切换确认消息，所述第一切换确认消息携带所述转发路径在所述目标AN上的IP地址和隧道ID。
  27. 根据权利要求25或26所述的目标AN，其特征在于，还包括：
    第二发送单元，用于发送第一路径切换请求消息给核心网控制面设备，所述第一路径切换请求消息用于请求切换NG3路径；
    其中，所述第一路径切换请求消息携带所述源NG3路径的ID和所述目标NG3路径的信息，所述目标NG3路径的信息包括所述目标NG3路径在所述目标 AN上的IP地址和隧道ID。
  28. 根据权利要求27所述的目标AN，其特征在于，所述第一路径切换请求消息还携带有所述目标NG3路径的数据类别指示符列表。
  29. 根据权利要求23或24所述的目标AN，其特征在于，还包括：第二处理单元和第三发送单元；
    所述接收单元，还用于在通过转发路径接收源AN发送的第二结束标记之前，接收核心网控制面设备发送的第三切换请求消息，所述第三切换请求消息携带第一容器，所述第一容器包含所述UE的源DRB信息和所述源NG3路径的信息；
    所述第二处理单元，用于根据所述源DRB信息，建立所述目标DRB；根据所述源NG3路径的信息，建立目标NG3路径；并根据所述第三切换请求消息，为所述转发路径分配资源；
    所述第三发送单元，用于向所述核心网控制面设备发送第二切换确认消息，所述第二切换确认消息携带所述目标AN的转发路径信息；
    其中，所述UE的源DRB信息包括：所述源DRB的QoS信息，所述源DRB的ID，以及所述源DRB的数据类别指示符；所述源NG3路径的信息包括：所述源NG3路径在所述源AN上的IP地址和隧道ID，以及所述源NG3路径在所述核心网用户面设备上的IP地址和隧道ID。
  30. 根据权利要求29所述的目标AN，其特征在于，所述第三发送单元还用于：
    发送第二路径切换请求消息给所述核心网控制面设备，所述第二路径切换请求消息用于请求切换NG3路径；
    其中，所述第二路径切换请求消息携带所述源NG3路径的ID，所述目标NG3路径的信息和NG2连接标识，所述目标NG3路径的信息包括所述目标NG3路径在所述目标AN上的IP地址和隧道ID，所述NG2连接标识用于指示所述UE切换完成。
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