WO2017113354A1 - 一种发送数据包的方法及装置 - Google Patents

一种发送数据包的方法及装置 Download PDF

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Publication number
WO2017113354A1
WO2017113354A1 PCT/CN2015/100253 CN2015100253W WO2017113354A1 WO 2017113354 A1 WO2017113354 A1 WO 2017113354A1 CN 2015100253 W CN2015100253 W CN 2015100253W WO 2017113354 A1 WO2017113354 A1 WO 2017113354A1
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Prior art keywords
bearer
sgw
context information
teid
data packet
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PCT/CN2015/100253
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English (en)
French (fr)
Inventor
陈中平
何钢杰
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201580081112.7A priority Critical patent/CN107683628B/zh
Priority to RU2018127889A priority patent/RU2689422C1/ru
Priority to EP15911979.1A priority patent/EP3379778B1/en
Priority to PCT/CN2015/100253 priority patent/WO2017113354A1/zh
Priority to JP2018534602A priority patent/JP6683323B2/ja
Publication of WO2017113354A1 publication Critical patent/WO2017113354A1/zh
Priority to US16/023,742 priority patent/US10554445B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2212/00—Encapsulation of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/30—Network data restoration; Network data reliability; Network data fault tolerance

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting a data packet.
  • the architecture of the distributed gateway is based on the idea of separating the control/user (C/U) of the network function in the existing EPS (Evolved Packet System).
  • EPS Evolved Packet System
  • An enhanced network architecture proposed on the network architecture.
  • C/U separation refers to the decoupling of the control plane function and the user plane function of the gateway.
  • the Serving Gateway (SGW) is logically divided into two independent logical network elements, namely the Serving Gateway.
  • SGW-C Serving Gateway for User Plane
  • SGW-U Serving Gateway for User Plane
  • SGW-C is the signaling control anchor of the surrounding network element, and is responsible for processing the signaling of the surrounding network element.
  • SGW-U is the processing anchor of the user data packet, and is responsible for receiving user data packets and transmitting user data packets.
  • the packet header of the data packet carries a Tunnel Endpoint Identifier (TEID) carried on the SGW-U side, where the bearer is a bearer for transmitting the data packet, according to the
  • the TEID obtains the context information of the bearer from the bearer context information stored in the TEID, and sends the data packet according to the context information.
  • the SGW-U sometimes loses the context information.
  • the context information corresponding to the TEID is lost and the context information is not obtained, the user data service is interrupted and the user experience is affected.
  • embodiments of the present invention provide a method and an apparatus for transmitting a data packet.
  • the technical solution is as follows:
  • a method of transmitting a data packet comprising:
  • the user plane service gateway SGW-U receives the data packet, and matches the context information of the corresponding bearer according to the tunnel endpoint identifier TEID carried in the data packet;
  • the trigger message is sent to the control plane serving gateway SGW-C, where the trigger message carries the TEID, and the trigger message is used by the SGW.
  • -C acquiring context information of the bearer according to the TEID;
  • the trigger message is sent to the sending SGW-C, requesting to acquire the context information of the bearer, so that the context information may be sent according to the acquired context information.
  • Data packets to prevent user interruptions and promote user experience.
  • the method further includes:
  • the SGW-U does not have the context information of the bearer identifier corresponding to the bearer, sending a modify bearer response message to the SGW-C, where the modify bearer response message carries the bearer identifier and is used to indicate the SGW. There is no indication information of the context information in the U, and the modify bearer response message is used by the SGW-C to obtain context information of the bearer according to the bearer identifier.
  • the SGW-C is requested to restore the context information of the bearer. It is guaranteed that when receiving a data packet, there is context information to send the data packet to prevent the user from interrupting the service.
  • a method of transmitting a data packet comprising:
  • the control plane serving gateway SGW-C receives the trigger message sent by the user plane service gateway SGW-U, where the trigger message carries the tunnel endpoint identifier TEID, and the trigger message is that the SGW-U receives the data packet carrying the TEID. And sending the context information that does not have the TEID corresponding bearer sent;
  • the re-establishment bearer context information is used by the SGW-U to send the data packet according to the context information.
  • the SGW-C when the context information of the bearer corresponding to the TEID is not matched in the SGW-U, the SGW-C sends the context information of the bearer to the SGW-U, so that the SGW-U can send data according to the context information.
  • the package prevents the user from interrupting the service and promotes the user experience.
  • the acquiring the context information of the bearer according to the TEID includes:
  • the modify bearer request message sent by the mobility management entity MME where the modify bearer request message carries the base station and the SGW-U, if the trigger message is received, and the time interval is reached before the preset time is reached.
  • the base station side TEID of the first tunnel and the address of the base station; the base station side TEID and the address of the base station are updated to the bearer context information corresponding to the TEID stored by the base station;
  • the SGW-U in the service request process, if the SGW-U does not have the context information of the bearer identifier corresponding to the bearer carried in the modify bearer request message, the context information is sent to the SGW-U. In order to ensure that the SGW-U receives the data packet, it has context information to send the data packet to prevent the user from interrupting the service.
  • the obtaining, by the TEID, the context information of the bearer further includes:
  • the context information of the bearer is obtained from the stored context information according to the TEID.
  • an apparatus for transmitting a data packet comprising:
  • a receiving unit configured to receive a data packet, and match, according to the tunnel endpoint identifier TEID carried in the data packet, context information of the corresponding bearer;
  • a sending unit configured to send a trigger message to the control plane serving gateway SGW-C if the context information of the bearer is not matched in the device, where the trigger message carries the TEID, and the trigger message is used by the sending SGW-C acquires context information of the bearer according to the TEID;
  • the receiving unit is further configured to receive, by the SGW-C, a re-establishment bearer context message, where Rebuilding a bearer context message carrying context information of the bearer;
  • the sending unit is further configured to send the data packet according to the context information of the bearer.
  • the trigger message is sent to the sending SGW-C, requesting to acquire the context information of the bearer, so that the context information may be sent according to the acquired context information.
  • Data packets to prevent user interruptions and promote user experience.
  • the receiving unit is further configured to receive a modify bearer request message sent by the SGW-C, where the modify bearer request message carries a bearer identifier;
  • the sending unit is further configured to: if the device does not have the context information of the bearer identifier corresponding to the bearer, send a modify bearer response message to the SGW-C, where the modify bearer response message carries the bearer identifier and And the indicating that the information is not in the apparatus, the modifying bearer response message is used by the SGW-C to obtain the context information of the bearer according to the bearer identifier;
  • the receiving unit is further configured to receive, by the SGW-C, a re-establishment bearer context message, where the re-establishment bearer context message carries context information of the bearer.
  • the SGW-C is requested to restore the context information of the bearer. It is guaranteed that when receiving a data packet, there is context information to send the data packet to prevent the user from interrupting the service.
  • an apparatus for transmitting a data packet comprising:
  • a receiving unit configured to receive a trigger message sent by the user plane service gateway SGW-U, where the trigger message carries a tunnel end identifier TEID, where the trigger message is that the SGW-U receives the data packet carrying the TEID and matches And sending the context information of the bearer corresponding to the TEID;
  • a processing unit configured to acquire context information of the bearer according to the TEID
  • a sending unit configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information, where the re-establishment bearer context information is used by the SGW-U to send the according to the context information data pack.
  • the SGW-C when the context information of the bearer corresponding to the TEID is not matched in the SGW-U, the SGW-C sends the context information of the bearer to the SGW-U, so that the SGW-U can send data according to the context information.
  • the package prevents the user from interrupting the service and promotes the user experience.
  • the processing unit is configured to start timing when the trigger message is received, and if the modified bearer request message sent by the mobility management entity MME is received before the time is reached, the modified bearer request message carries the base station. Updating the base station side TEID and the address of the base station to the context information of the TEID corresponding bearer stored by the base station side TEID and the address of the base station of the first tunnel between the SGW and the UGW; The TEID is obtained, and the updated context information of the bearer is obtained from the stored context information.
  • the SGW-U in the service request process, if the SGW-U does not have the context information of the bearer identifier corresponding to the bearer carried in the modify bearer request message, the context information is sent to the SGW-U. In order to ensure that the SGW-U receives the data packet, it has context information to send the data packet to prevent the user from interrupting the service.
  • the processing unit is configured to: if the modified bearer request message sent by the MME is not received when the time is reached, the acquiring the bearer from the stored context information according to the TEID Contextual information.
  • FIG. 1 is a schematic diagram of a DGW logical network architecture provided by an embodiment of the present invention.
  • FIG. 2 is a structural block diagram of an SGW-U according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of an SGW-C according to an embodiment of the present invention.
  • 4-1 is a flowchart of a method for sending a data packet according to an embodiment of the present invention
  • 4-2 is a flowchart of another method for sending a data packet according to an embodiment of the present invention.
  • 4-3 is a flowchart of a service request process according to an embodiment of the present invention.
  • 4-4 is a flowchart of another service request process according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an apparatus for transmitting a data packet according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an apparatus for transmitting a data packet according to an embodiment of the present invention.
  • the present invention is applied to the DGW network architecture.
  • the SGW is divided into two independent logical network elements: SGW-C and SGW-U.
  • the SGW-C is the signaling control anchor of the neighboring network element. It is responsible for processing the signaling of the surrounding network elements. It can be deployed in a centralized manner and deployed at a higher location, for example, deployed in the provincial center.
  • the SGW-U is the processing anchor of the user data packet. It is responsible for receiving the data packets of the user and sending the data packets of the user. It can be distributed and deployed closer to the user, for example, deployed near the base station.
  • a bearer for transmitting a data packet is established on the SGW-U, and the bearer between the base station, the SGW-U and the SGW-U includes a first tunnel between the base station and the SGW-U, and a SGW-U and a user plane packet data gateway ( a second tunnel between the Packet Data Network GateWay and the PGW-U; the first tunnel uses two TEIDs to identify the two ends thereof, and the TEID uses a TEID to identify the first tunnel at the base station side, at the SGW-
  • the U side uses another TEID to identify the end of the first tunnel on the SGW-U side; the second tunnel uses two TEIDs to identify the two ends respectively, and the SGW-U side uses a TEID to identify the second tunnel at the SGW-U.
  • another TEID is used on the PGW-U side to identify the end of the tunnel on the PGW-U side.
  • the SGW-U includes context information of each bearer
  • the SGW-C includes context information of each bearer in each SGW-U
  • the context information of each bearer in the SGW-U is configured by the SGW-C.
  • the context information of the bearer may be used to identify the bearer
  • the context information may include the bearer identifier of the bearer, the TEID of the first tunnel at the base station side, the address of the base station, and the SGW-U
  • the SGW-U can receive the uplink data packet sent by the base station, and the packet header of the uplink data packet sent by the base station includes information such as the TEID of the first tunnel on the SGW-U side; and after receiving the uplink data packet, the SGW-U receives the uplink data packet according to the uplink data.
  • the TEID carried by the packet acquires the context information of the bearer corresponding to the TEID, and sends the uplink data packet to the PGW-U according to the TEID of the second tunnel included in the context information on the PGW-U side and the address of the PGW-U.
  • the SGW-U can receive the downlink data packet sent by the PGW-U, and the packet header of the downlink data packet sent by the PGW-U includes information such as the TEID of the second tunnel on the SGW-U side; after receiving the downlink data packet, the SGW-U receives the downlink data packet.
  • the context information of the bearer corresponding to the TEID is obtained according to the TEID carried in the downlink data packet, and the downlink data packet is sent to the base station according to the TEID of the first tunnel and the address of the base station of the first tunnel included in the context information.
  • the SGW-U sometimes loses context information, and causes the SGW-U to carry the uplink data packet sent by the base station or the downlink data packet sent by the PGW-U according to the uplink data packet.
  • the TEID of the SGW-U side or the TEID of the SGW-U side carried by the downlink data packet cannot obtain the lost context information.
  • the SGW-U can recover the lost context information through the SGW-C, and then pass the restored context.
  • the information is sent by the uplink data packet or the downlink data packet.
  • the detailed process of the SGW-U recovering the context information and sending the uplink data packet or the downlink data packet by using the SGW-C is described in the following embodiments, and is not described in detail herein.
  • FIG. 2 is a structural block diagram of an SGW-U200 according to an embodiment of the present invention.
  • the SGW-U 200 may vary considerably depending on configuration or performance, and may include one or more receivers 201, a transmitter 202, and a processor 203, one or more storage media 206 that store application 204 or data 205 ( For example, one or one storage device in Shanghai).
  • the storage medium 206 can be short-lived or persistent.
  • the program stored on storage medium 206 may include one or more modules (not shown), each of which may include a series of instruction operations.
  • the processor 203 can be arranged to communicate with the storage medium 206 to perform a series of instruction operations in the storage medium 206 on the SGW-U 200.
  • the SGW-U 200 may also include one or more power sources 207, one or more wired or wireless network interfaces 208, one or more input and output interfaces 209, and/or one or more operating systems 210, such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • operating systems 210 such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • the receiver 201 and the transmitter 202 of the SGW-U 200 have the following functions:
  • the receiver 201 is configured to receive a data packet, and match the context information of the corresponding bearer according to the TEID carried by the data packet;
  • the sender 202 is configured to send a trigger message to the SGW-C if the context information of the bearer is not in the SGW-U200, where the trigger message carries the TEID, and the trigger message is used by the SGW.
  • -C acquiring context information of the bearer according to the TEID;
  • the receiver 201 is further configured to receive, by the SGW-C, a re-establishment bearer context message, where the re-establishment bearer context message carries context information of the bearer;
  • the transmitter 202 is further configured to send the data packet according to the context information of the bearer.
  • the receiver is further configured to receive a modify bearer request message sent by the SGW-C, where the modify bearer request message carries a bearer identifier;
  • the transmitter is further configured to: if the SGW-U200 does not have the context information of the bearer identifier corresponding to the bearer, send a modify bearer response message to the SGW-C, where the modify bearer response message carries the bearer identifier And the indication information indicating that the context information is not included in the SGW-U200, where the modify bearer response message is used by the SGW-C to obtain context information of the bearer according to the bearer identifier;
  • the receiver is further configured to receive, by the SGW-C, a re-establishment bearer context message, where the re-establishment bearer context message carries context information of the bearer.
  • the trigger message is sent to the sending SGW-C, and the context information of the bearer is requested, so that the obtained context information may be obtained.
  • FIG. 3 is a structural block diagram of an SGW-C300 according to an embodiment of the present invention.
  • the SGW-C300 may generate a large difference due to different configurations or performances, and may include one or more receivers 201, a processor 202, and Transmitter 203, one or more storage media 206 that store application 204 or data 205 (eg, one or one storage device in Shanghai).
  • the storage medium 206 can be short-lived or persistent.
  • the program stored on storage medium 206 may include one or more modules (not shown), each of which may include a series of instruction operations.
  • the processor 202 can be configured to communicate with the storage medium 206 to perform a series of instruction operations in the storage medium 206 on the SGW-C 200.
  • the SGW-C 200 may also include one or more power sources 207, one or more wired or wireless network interfaces 208, one or more input and output interfaces 209, and/or one or more operating systems 210, such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • operating systems 210 such as Windows ServerTM, Mac. OS XTM, UnixTM, LinuxTM, FreeBSDTM and more.
  • the receiver 201, the processor 202, and the transmitter 203 of the SGW-C 200 have the following functions:
  • the receiving unit 201 is configured to receive a trigger message sent by the SGW-U, where the trigger message carries a TEID, where the trigger message is that the SGW-U receives the data packet carrying the TEID and determines that the TEID is not corresponding to the TEID. Sent after the context information is carried;
  • the processing unit 202 is configured to acquire context information of the bearer according to the TEID.
  • the sending unit 203 is configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information, where the re-establishment bearer context information is used by the SGW-U to send according to the context information.
  • the data packet is configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information, where the re-establishment bearer context information is used by the SGW-U to send according to the context information.
  • the processor 202 is configured to start timing when the trigger message is received, and if the modified bearer request message sent by the MME is received before the preset time reaches the preset time, the modify bearer request message carries And the base station side TEID of the first tunnel between the base station and the SGW-U and the address of the base station, and updating the base station side TEID and the address of the base station to the context information of the TEID corresponding bearer stored by the base station, according to the The TEID is obtained, and the updated context information of the bearer is obtained from the stored context information.
  • the processor is configured to: if the modified bearer request message sent by the MME is not received when the time is up, is performed according to the TEID, from the stored context information. Obtaining updated context information of the bearer.
  • the SGW-C when the context information of the bearer corresponding to the TEID is not matched in the SGW-U, the SGW-C sends the context information of the bearer to the SGW-U, so that the SGW-U can send according to the context information. Data packets to prevent user interruptions and promote user experience.
  • an embodiment of the present invention provides a method for sending a data packet, including:
  • Step 401 The SGW-U receives the data packet sent by the first network element, where the data packet carries the TEID of the tunnel on the SGW-U side, where the tunnel is used for transmitting the data packet, and is located in the corresponding bearer of the TEID.
  • the data packet may be an uplink data packet sent by the base station or a downlink data packet sent by the PGW-U.
  • the base station sends the uplink data packet on the first tunnel between the SGW and the SGW, and the packet header of the uplink data packet includes the TEID of the first tunnel on the SGW-U side.
  • the PGW-U sends the downlink data packet on the second tunnel between the SGW and the UGW, and the packet header of the downlink data packet includes the TEID of the second tunnel on the SGW-U side.
  • the header of the uplink data packet or the header of the downlink data packet may further carry other information, for example, the address of the SGW-U may also be carried.
  • Step 402 The SGW-U obtains the context information of the bearer corresponding to the TEID according to the TEID. If the context information of the bearer is not obtained, step 403 is performed.
  • the SGW-U searches for the context information including the TEID from the context information of each bearer stored by the SGW-U. If the context information is included, the SGW-U obtains the context information, where the context information is the TEID. If the context information of the bearer is not included, the context information of the bearer may not be obtained.
  • the SGW-U sends the data packet according to the acquired context information. Specifically, if the data packet is an uplink data packet, the SGW-U sends the uplink data packet to the PGW-U according to the TEID of the SGW-U and the address of the PGW-U according to the second tunnel included in the context information; The data packet is a downlink data packet, and the SGW-U sends the downlink data packet to the base station according to the TEID of the SGW-U and the address of the base station according to the first tunnel included in the context information.
  • Step 403 The SGW-U sends a trigger message to the SGW-C, where the trigger message carries the TEID of the SGW-U side.
  • the SGW-U may lose the context information of the bearer.
  • the SGW-C since the uplink information of each bearer on the SGW-U is configured by the SGW-C, the SGW-C includes the lost context information of the bearer, and the SGW-U sends a trigger message to the SGW-C to request recovery. Missing context information for this bearer.
  • the SGW-U can be implemented by an object-oriented implementation, and includes an object-oriented module such as an input interface module, a connection module, a control module, and an output interface module.
  • the SGW-U can perform the above steps 401 to 403 through these object-oriented modules, and the specific implementation is as follows:
  • the input interface module receives the data packet, first strips the outer IP header of the data packet to obtain a GTP-U data packet, and matches the corresponding connection module according to the address of the SGW-U included in the IP packet header. Transmitting the GTP-U data packet to the connection module; the connection module stripping the GTP-U packet header of the outermost layer of the GTP-U data packet to obtain a data portion, and according to the SGW-U side included in the GTP-U packet header
  • the TEID is configured to check whether the context information of the TEID is included in the context information of each bearer stored in the UE.
  • the context information of the TEID is not included, the context information of the bearer is not obtained, and the GTP header encapsulation operation is performed. And the data part is added to the stripped GTP-U header to generate a GTP-U data packet or a configuration error indication message, where the error indication message includes TEID information in the original GTP-U header, and the GTP-U is transmitted to the control module.
  • the control module receives the GTP-U data packet or the error indication message, and encapsulates the GTP-U data packet or the error indication message into a trigger message data packet, and transmits the data packet to the output interface module Lose the trigger a message data packet;
  • the output interface module receives the trigger message data packet, and adds an IP packet header to obtain a trigger message before the trigger message data packet, where the IP packet header includes an address of the SGW-U and an address of the SGW-C, and sends the address to the SGW-C.
  • the trigger message is optionally, refer to Table 1 below, and the structure of the trigger message is as shown in Table 1.
  • Tunnel Endpoint Identifier (TEID) TEID carried by the user plane
  • Step 404 The SGW-C receives the trigger message, and obtains the context information of the bearer according to the TEID carried in the trigger message.
  • the SGW-C receives the trigger message, and searches for the context information including the TEID from the context information stored in the triggering message, and obtains the context information that is found, where the context information is the bearer. Contextual information.
  • the context information of the bearer may include a bearer identifier of the bearer, a TEID of the first tunnel on the base station side and an address of the base station, and an address of the TEID and the SGW-U on the SGW-U side, and the second tunnel is in the SGW- The address of the TEID and SGW-U on the U side and the TEID and PGW-U addresses on the PGW-U side, both the first tunnel and the second tunnel are tunnels in the bearer.
  • Step 405 The SGW-C sends a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information of the bearer.
  • the TEID and the address of the local S1 interface may be the TEID of the first tunnel and the address of the base station, and the TEID and address of the S1 interface of the first tunnel may be the TEID and SGW-U of the first tunnel on the SGW-U side.
  • the TEID and the address of the local S5 interface may be the TEID of the second tunnel on the SGW-U side and the address of the SGW-U.
  • the TEID and address of the interface of the peer S5 may be the TEID of the second tunnel on the PGW-U side.
  • the UE may be in an idle state, the first tunnel between the base station and the SGW-U is released in the idle state, and the context information of the bearer stored in the SGW-C is not a complete context information, and the bearer is not a complete context information.
  • the base station side TEID of the first tunnel and the address of the base station are not included in the context information, but include the TEID and SGW-U addresses of the second tunnel on the SGW-U side and the TEID and PGW-U addresses on the PGW-U side. .
  • the SGW-U may receive the uplink data packet of the UE, and if it does not have the context information of the bearer, send a trigger message to the SGW-C. If the SGW-C obtains the context information of the bearer immediately after receiving the trigger message, the context information of the bearer may not be recovered by itself, and the obtained context information of the bearer is an incomplete context information, so When the time is reached, the context information of the bearer is recovered, and the recovered context information of the bearer is obtained. If the time of the timer reaches the preset time, the bearer has not been restored. Context information, then obtain the context information of the bearer saved by itself.
  • Service Request service request process
  • the specific implementation is: first, the UE sends a service request message to the base station; and second, the base station receives the service request. After the message is forwarded to the MME, the service request message is forwarded. The third step, after the MME is authorized and verified, sends an S1-AP initial context setting request message to the base station, where the request message carries the TEID and SGW of the first tunnel on the SGW-U side.
  • the fourth step the base station receives the S1-AP initial context setting request message, establishes an air interface connection with the UE, and sends an S1-AP initial context setting completion message to the MME after establishing the air interface connection, the S1
  • the AP initial context setting completion message carries the TEID of the first tunnel on the base station side and the address of the base station.
  • the MME receives the S1-AP initial context setup complete message, and sends a modify bearer request message to the SGW-C, where the modified bearer is sent.
  • the request message carries the TEID of the first tunnel on the base station side and the address of the base station; in the sixth step, the SGW-C receives the modified bearer request message, and stores the TEID of the first tunnel on the base station side and the address of the base station. It is stored in the context information of the bearer corresponding to the TEID, so that the context information of the bearer is restored.
  • the UE may send an uplink data packet to the base station, and the base station receives the uplink data packet, and sends the uplink data packet to the SGW-U.
  • the SGW-U receives the uplink data packet, and according to the TEID carried in the uplink data packet, the TEID corresponding to the bearer cannot be obtained.
  • the following message sends a trigger message to the SGW-C.
  • the SGW-C may receive the trigger message sent by the SGW-U before receiving the modify bearer request message sent by the MME. If the context information of the bearer is acquired at this time, an incomplete context information may be obtained, so the When the trigger message is started, a timer is started to wait for the arrival of the bearer modification request message sent by the MME, where the modified bearer request message carries the TEID of the first tunnel between the base station and the SGW-U at the base station side and the base station. The address, if the modified bearer request message sent by the MME is received before the time when the timer expires, the TEID of the first tunnel between the base station and the SGW-U is added to the address of the base station and the address of the base station.
  • the TEID corresponds to the context information of the bearer; the context information of the corresponding bearer is obtained from the stored context information according to the TEID carried in the trigger message, and then the reconstructed bearer context message is sent to the SGW-U, where the reconstructed bearer context information carries The context information of the bearer.
  • the SGW-C obtains the context information of the bearer from the context information stored in the trigger message according to the TEID carried in the trigger message. Sending a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context information carries context information of the bearer.
  • Step 406 The SGW-U receives the re-establishment bearer context message, and sends the data packet according to the context information carried in the re-establishment bearer context message.
  • the SGW-U receives the re-establishment bearer context message, and if the data packet is an uplink data packet, the SGW-U sends the TEID and the PGW-U address of the SGW-U according to the second tunnel included in the context information.
  • the PGW-U sends the uplink data packet; if the data packet is a downlink data packet, the SGW-U sends the downlink data packet to the base station according to the TEID of the SGW-U and the address of the base station according to the first tunnel included in the context information. .
  • the context information of the bearer in the SGW-C may be restored as follows:
  • the UE initiates a service request procedure according to the foregoing first to sixth steps, and restores the bearer context information in the SGW-C.
  • the SGW-C sends a modify bearer request message to the SGW-U, where the modify bearer request message carries the bearer identifier of the bearer;
  • the SGW-U receives the bearer modification request message, and determines, according to the bearer identifier carried in the bearer modification request message, The device does not have the context information of the bearer, and sends a modify bearer response message to the SGW-C, where the modify bearer response message carries the bearer identifier and the failure indication message, where the failure indication message indicates that the corresponding bearer context information cannot be found;
  • SGW-C Receiving the modified bearer response message, and sending a re-establishment bearer context message to the SGW-U, The re-establishment bearer context message carries the context information of the bearer identifier corresponding to the
  • the trigger message is sent to the sending SGW-C, and the context information of the bearer is requested, so that the obtained context information may be obtained.
  • an embodiment of the present invention provides an apparatus 500 for transmitting a data packet, where the apparatus includes:
  • the receiving unit 501 is configured to receive a data packet, and match the context information of the corresponding bearer according to the TEID carried in the data packet;
  • the sending unit 502 is configured to send a trigger message to the SGW-C if the context information of the bearer is not matched in the device 500, where the trigger message carries the TEID, and the trigger message is used by the SGW- C acquiring context information of the bearer according to the TEID;
  • the receiving unit 501 is further configured to receive a re-establishment bearer context message sent by the SGW-C, where the re-establishment bearer context message carries context information of the bearer;
  • the sending unit 502 is further configured to send the data packet according to the context information of the bearer.
  • the receiving unit 501 is further configured to receive a modify bearer request message sent by the SGW-C, where the modify bearer request message carries a bearer identifier;
  • the sending unit 502 is further configured to: if the device does not have the context information of the bearer identifier corresponding to the bearer, send a modify bearer response message to the SGW-C, where the modify bearer response message carries the bearer identifier and And the indication information indicating that the context information is not included in the device, where the modify bearer response message is used by the SGW-C to obtain context information of the bearer according to the bearer identifier;
  • the receiving unit 501 is further configured to receive, by the SGW-C, a re-establishment bearer context message, where the re-establishment bearer context message carries context information of the bearer.
  • the trigger message is sent to the sending SGW-C, and the context information of the bearer is requested, so that the obtained context information may be obtained.
  • an embodiment of the present invention provides an apparatus 600 for transmitting a data packet, where the apparatus package include:
  • the receiving unit 601 is configured to receive a trigger message sent by the SGW-U, where the trigger message carries a TEID, where the trigger message is that the SGW-U receives the data packet carrying the TEID and determines that the TEID is not corresponding to the TEID. Sent after the context information is carried;
  • the processing unit 602 is configured to acquire context information of the bearer according to the TEID.
  • the sending unit 603 is configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information, where the re-establishment bearer context information is used by the SGW-U to send according to the context information.
  • the data packet is configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer context message carries the context information, where the re-establishment bearer context information is used by the SGW-U to send according to the context information.
  • the processing unit 602 is configured to start timing when the trigger message is received, and if the modified bearer request message sent by the MME is received before the preset time reaches the preset time, the modify bearer request message carries And the base station side TEID of the first tunnel between the base station and the SGW-U and the address of the base station, and updating the base station side TEID and the address of the base station to the context information of the TEID corresponding bearer stored by the base station; The TEID is obtained, and the updated context information of the bearer is obtained from the stored context information.
  • the processing unit 602 is configured to: if the modified bearer request message sent by the MME is not received when the time period reaches the preset time, the stored context information is used according to the TEID. Obtaining the context information of the bearer.
  • the receiving unit 601 is further configured to receive a modify bearer request message sent by the mobile terminal management entity MME, where the modify bearer request message carries a base station side TEID of the first tunnel between the base station and the SGW-U. And the address of the base station;
  • the sending unit 603 is further configured to send a re-establishment bearer context message to the SGW-U, where the re-establishment bearer uplink and downlink message carries context information of the bearer.
  • the sending unit 603 is further configured to send a modify bearer request message to the SGW-U, where the modify bearer request message carries a bearer identifier, where the bearer identifier is used by the SGW-U to determine whether it has Context information of the bearer;
  • the receiving unit 601 is further configured to receive a modify bearer response message that is sent by the SGW-U when determining that the bearer does not have the context information of the bearer.
  • the SGW-C when the context information of the bearer corresponding to the TEID is not matched in the SGW-U, the SGW-C sends the context information of the bearer to the SGW-U, so that the SGW-U can send according to the context information. Data packets to prevent user interruptions and promote user experience.
  • a person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by hardware, or may be instructed by a program to execute related hardware, and the program may be stored in a computer readable storage medium.
  • the storage medium mentioned may be a read only memory, a magnetic disk or an optical disk or the like.

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Abstract

本发明实施例提供了一种发送数据包的方法及装置，涉及通信领域，所述方法包括：SGW-U接收数据包，根据所述数据包携带的隧道端点标识TEID匹配对应承载的上下文信息；如果匹配出所述SGW-U中没有所述承载的上下文信息，则向控制面服务网关SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；根据所述承载的上下文信息，发送所述数据包。本发明可以防止用户业务的中断。

Description

一种发送数据包的方法及装置 技术领域
本发明涉及通信领域，特别涉及一种发送数据包的方法及装置。
背景技术
随着网络架构的演进，分布式网关(Distributed Gateway，DGW)的架构是基于网络功能的控制/用户(Control/User，C/U)分离的思路在已有的EPS(Evolved Packet System，演进分组系统)网络架构上提出的一种增强网络架构。C/U分离是指将网关的控制面功能和用户面功能解耦，其中，服务网关(Serving Gateway，SGW)在逻辑上分成两个独立的逻辑网元，分别为控制面服务网关(Serving Gateway for Control Plane，SGW-C)和用户面服务网关(Serving Gateway for User Plane，SGW-U)，SGW-C是周边网元的信令控制锚点，负责对周边网元的信令进行处理，SGW-U是用户数据包的处理锚点，负责接收用户数据包和发送用户数据包。
目前，SGW-U在接收到数据包时，该数据包的包头携带承载在SGW-U侧的隧道端点标识(Tunnel Endpoint Identifier，TEID)，该承载是用于传输该数据包的承载，根据该TEID从自身存储的承载上下文信息中获取该承载的上下文信息，根据该上下文信息发送该数据包。
在实现本发明的过程中，发明人发现现有技术至少存在以下问题：
目前，SGW-U有时丢失上下文信息，当该TEID对应的上下文信息丢失导致没有获取到该上下文信息时，会导致用户数据业务中断，影响用户体验。
发明内容
为了防止用户的业务中断，促进用户体验，本发明实施例提供了一种发送数据包的方法及装置。所述技术方案如下：
第一方面，提供了一种发送数据包的方法，所述方法包括：
用户面服务网关SGW-U接收数据包，根据所述数据包携带的隧道端点标识TEID匹配对应承载的上下文信息；
如果匹配出所述SGW-U中没有所述TEID对应承载的上下文信息，则向控制面服务网关SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；
根据所述承载的上下文信息，发送所述数据包。
在第一方面中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，向发SGW-C发送触发消息，请求获取该承载的上下文信息，这样可以根据获取的上下文信息发送数据包，防止用户的业务中断，促进用户体验。
可选的，结合第一方面，在第一方面的第一种可能的实现方式中，所述方法还包括：
接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
如果所述SGW-U中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带所述承载标识和用于指示所述SGW-U中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
接收所述SGW-C发送的重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
在第一方面的第一种可能的实现方式中，在服务请求流程中，如果没有该修改承载请求消息携带的承载标识对应承载的上下文信息时，向SGW-C请求恢复自身的上下文信息，以保证在接收到数据包时，有上下文信息来发送数据包，防止用户的业务中断。
第二方面，提供了一种发送数据包的方法，所述方法包括：
控制面服务网关SGW-C接收用户面服务网关SGW-U发送的触发消息，所述触发消息携带隧道端点标识TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且匹配出自身没有所述TEID对应承载的上下文信息后发送的；
根据所述TEID，获取所述承载的上下文信息；
向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所 述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
在第二方面中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，SGW-C向SGW-U发送该承载的上下文信息，这样可以SGW-U根据该上下文信息发送数据包，防止用户的业务中断，促进用户体验。
结合第二方面，在第二方面的第一种可能的实现方式中，所述根据所述TEID，获取所述承载的上下文信息，包括：
在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到移动性管理实体MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址；则将所述基站侧TEID和所述基站的地址更新到自身存储的所述TEID对应的承载上下文信息中；
根据所述TEID，从存储的上下文信息中获取所述更新后的所述承载的上下文信息。
在第二方面的第一种可能的实现方式中，在服务请求流程中，如果SGW-U没有该修改承载请求消息携带的承载标识对应承载的上下文信息时，向SGW-U发送该上下文信息，以保证SGW-U在接收到数据包时，有上下文信息来发送数据包，防止用户的业务中断。
结合第二方面的第一种可能的实现方式，在第二方面的第二种可能的实现方式中，所述根据所述TEID，获取所述承载的上下文信息，还包括：
若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
第三方面，提供了一种发送数据包的装置，所述装置包括：
接收单元，用于接收数据包，根据所述数据包携带的隧道端点标识TEID匹配对应承载的上下文信息；
发送单元，用于如果匹配出所述装置中没有所述承载的上下文信息，则向控制面服务网关SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
所述接收单元，还用于接收所述SGW-C发送重建承载上下文消息，所述 重建承载上下文消息携带所述承载的上下文信息；
所述发送单元，还用于根据所述承载的上下文信息，发送所述数据包。
在第三方面中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，向发SGW-C发送触发消息，请求获取该承载的上下文信息，这样可以根据获取的上下文信息发送数据包，防止用户的业务中断，促进用户体验。
结合第三方面，在第三方面的第一种可能的实现方式中，
所述接收单元，还用于接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
所述发送单元，还用于如果所述装置中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带所述承载标识和用于指示所述装置中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
所述接收单元，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
在第三方面的第一种可能的实现方式中，在服务请求流程中，如果没有该修改承载请求消息携带的承载标识对应承载的上下文信息时，向SGW-C请求恢复自身的上下文信息，以保证在接收到数据包时，有上下文信息来发送数据包，防止用户的业务中断。
第四方面，提供了一种发送数据包的装置，所述装置包括：
接收单元，用于接收用户面服务网关SGW-U发送的触发消息，所述触发消息携带隧道端点标识TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且匹配出自身没有所述TEID对应承载的上下文信息后发送的；
处理单元，用于根据所述TEID，获取所述承载的上下文信息；
发送单元，用于向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
在第四方面中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，SGW-C向SGW-U发送该承载的上下文信息，这样SGW-U可以根据该上下文信息发送数据包，防止用户的业务中断，促进用户体验。
结合第四方面，在第四方面的第一种可能的实现方式中，
所述处理单元，用于在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到移动性管理实体MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址，将所述基站侧TEID和所述基站的地址更新到自身存储的所述TEID对应承载的上下文信息中；根据所述TEID，从存储的上下文信息中获取所述更新后的所述承载的上下文信息。
在第四方面的第一种可能的实现方式中，在服务请求流程中，如果SGW-U没有该修改承载请求消息携带的承载标识对应承载的上下文信息时，向SGW-U发送该上下文信息，以保证SGW-U在接收到数据包时，有上下文信息来发送数据包，防止用户的业务中断。
结合第四方面的第一种可能的实现方式，在第四方面的第二种可能的实现方式中，
所述处理单元，用于若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
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作简单地介绍，显而易见地，下面描述中的附图仅仅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的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的一种DGW逻辑网络架构图；
图2是本发明实施例提供的一种SGW-U的结构框图；
图3是本发明实施例提供的一种SGW-C的结构框图；
图4-1是本发明实施例提供的一种发送数据包的方法流程图；
图4-2是本发明实施例提供的另一种发送数据包的方法流程图；
图4-3是本发明实施例提供的一种服务请求流程的流程图；
图4-4是本发明实施例提供的另一种服务请求流程的流程图；
图5是本发明实施例提供的一种发送数据包的装置结构示意图；
图6是本发明实施例提供的一种发送数据包的装置结构示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明实施方式作进一步地详细描述。
本发明应用于DGW网络架构，参见图1所示的DGW网络架构，在DGW网络架构中SGW分为SGW-C和SGW-U两个独立的逻辑网元。SGW-C是周边网元的信令控制锚点，负责对周边网元的信令进行处理，可以采用集中部署，且部署的位置较高，例如部署在省中心。SGW-U是用户数据包的处理锚点，负责接收用户的数据包和发送用户的数据包，可以采用分布式部署，更靠近用户，例如部署在基站附近。
SGW-U上建立有用于传输数据包的承载，在基站、SGW-U和SGW-U之间该承载包括基站与SGW-U之间的第一隧道和SGW-U与用户面分组数据网关(Packet Data Network GateWay，PGW-U)之间的第二隧道；第一隧道用两个TEID分别来标识其两端，在基站侧用一个TEID来标识第一隧道在基站侧的一端，在SGW-U侧用另一个TEID来标识第一隧道位于SGW-U侧的一端；第二隧道用两个TEID分别来标识其两端，在SGW-U侧用一个TEID来标识第二隧道位于SGW-U侧的一端，在PGW-U侧用另一个TEID来标识该隧道位于PGW-U侧的一端。
SGW-U中包括每个承载的上下文信息，SGW-C中包括各SGW-U中的每个承载的上下文信息，且SGW-U中的每个承载的上下文信息都是由SGW-C配置的。对于SGW-U上的每个承载，该承载的上下文信息可以用于标识该承载，该上下文信息可以包括该承载的承载标识，第一隧道在基站侧的TEID和基站的地址以及在SGW-U侧的TEID和SGW-U的地址，第二隧道在SGW-U侧的TEID和SGW-U的地址以及在PGW-U侧的TEID和PGW-U的地址。
SGW-U可以接收基站发送的上行数据包，且基站发送的该上行数据包的包头包括第一隧道在SGW-U侧的TEID等信息；SGW-U接收该上行数据包后，根据该上行数据包携带的TEID，获取该TEID对应承载的上下文信息，根据该上下文信息包括的第二隧道在PGW-U侧的TEID和该PGW-U的地址，向该PGW-U发送该上行数据包。
SGW-U可以接收PGW-U发送的下行数据包，且PGW-U发送的该下行数据包的包头包括第二隧道在SGW-U侧的TEID等信息；SGW-U接收该下行数据包后，根据该下行数据包携带的TEID，获取该TEID对应承载的上下文信息，根据该上下文信息包括的第一隧道在基站侧的TEID和该基站的地址，向该基站发送该下行数据包。
其中，需要说明的是：SGW-U有时会发生丢失上下文信息的情况，导致SGW-U在接收到基站发送的上行数据包或PGW-U发送的下行数据包时，根据该上行数据包携带的SGW-U侧的TEID或该下行数据包携带的SGW-U侧的TEID，获取不到丢失的上下文信息，此时SGW-U可以通过SGW-C恢复自身丢失的上下文信息，然后通过恢复的上下文信息发送该上行数据包或该下行数据包。其中，SGW-U通过SGW-C恢复该上下文信息以及发送该上行数据包或该下行数据包的详细过程，在后续实施例进行说明，在此不详细描述。
参见图2，图2是本发明实施例提供的SGW-U200的结构框图。SGW-U200可因配置或性能不同而产生比较大的差异，可以包括一个或一个以上接收器201、发送器202和处理器203，一个或一个以上存储应用程序204或数据205的存储介质206(例如一个或一个以上海量存储设备)。其中，存储介质206可以是短暂存储或持久存储。存储在存储介质206的程序可以包括一个或一个以上模块(图示没标出)，每个模块可以包括一系列指令操作。更进一步地，处理器203可以设置为与存储介质206通信，在SGW-U200上执行存储介质206中的一系列指令操作。
SGW-U200还可以包括一个或一个以上电源207，一个或一个以上有线或无线网络接口208，一个或一个以上输入输出接口209，和/或，一个或一个以上操作系统210，例如Windows ServerTM，Mac OS XTM，UnixTM，LinuxTM，FreeBSDTM等等。
在本发明中SGW-U200的接收器201和发送器202具有以下功能：
接收器201，用于接收数据包，根据所述数据包携带的TEID匹配对应承载的上下文信息；
发送器202，用于如果匹配出所述SGW-U200中没有所述承载的上下文信息，则向SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
所述接收器201，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；
所述发送器202，还用于根据所述承载的上下文信息，发送所述数据包。
可选的，所述接收器，还用于接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
所述发送器，还用于如果所述SGW-U200中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带所述承载标识和用于指示所述SGW-U200中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
所述接收器，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
在本发明实施例中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，向发SGW-C发送触发消息，请求获取该承载的上下文信息，这样可以根据获取的上下文信息发送数据包，防止用户的业务中断，促进用户体验。
参见图3，图3是本发明实施例提供的SGW-C300的结构框图,SGW-C300可因配置或性能不同而产生比较大的差异，可以包括一个或一个以上接收器201、处理器202和发送器203，一个或一个以上存储应用程序204或数据205的存储介质206(例如一个或一个以上海量存储设备)。其中，存储介质206可以是短暂存储或持久存储。存储在存储介质206的程序可以包括一个或一个以上模块(图示没标出)，每个模块可以包括一系列指令操作。更进一步地，处理器202可以设置为与存储介质206通信，在SGW-C200上执行存储介质206中的一系列指令操作。
SGW-C200还可以包括一个或一个以上电源207，一个或一个以上有线或无线网络接口208，一个或一个以上输入输出接口209，和/或，一个或一个以上操作系统210，例如Windows ServerTM，Mac OS XTM，UnixTM，LinuxTM，FreeBSDTM等等。
在本发明中SGW-C200的接收器201、处理器202和发送器203具有以下功能：
接收单元201，用于接收SGW-U发送的触发消息，所述触发消息携带TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且确定自身没有所述TEID对应承载的上下文信息后发送的；
处理单元202，用于根据所述TEID，获取所述承载的上下文信息；
发送单元203，用于向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
可选的，所述处理器202，用于在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址，则将所述基站侧TEID和基站的地址更新到自身存储的所述TEID对应承载的上下文信息中，根据所述TEID，从存储的上下文信息中获取所述更新后的所述承载的上下文信息。
可选的，所述处理器，用于若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取更新后的所述承载的上下文信息。
在本发明实施例中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，SGW-C向SGW-U发送该承载的上下文信息，这样可以SGW-U根据该上下文信息发送数据包，防止用户的业务中断，促进用户体验。
实施例4
参见图4-1，本发明实施例提供了一种发送数据包的方法，包括：
步骤401：SGW-U接收第一网元发送的数据包，该数据包携带隧道在SGW-U侧的TEID，该隧道为用于传输该数据包，且位于该TEID对应承载中。
该数据包可以为基站发送的上行数据包或PGW-U发送的下行数据包。对于该上行数据包，基站在其与SGW-U之间的第一隧道上发送该上行数据包，且该上行数据包的包头中包括第一隧道在SGW-U侧的TEID。对于该下行数据包，PGW-U在其与SGW-U之间的第二隧道上发送该下行数据包，且该下行数据包的包头中包括第二隧道在SGW-U侧的TEID。
其中，该上行数据包的包头或该下行数据包的包头还可以携带其他信息，例如还可以携带SGW-U的地址等。
步骤402：SGW-U根据该TEID获取该TEID对应的承载的上下文信息，若获取不到该承载的上下文信息，则执行步骤403。
具体的，SGW-U根据该TEID，从自身存储的各承载的上下文信息中查找是否有包括该TEID的上下文信息，如果有包括该上下文信息，则获取该上下文信息，该上下文信息即为该TEID对应承载的上下文信息，如果没有包括该TEID的上下文信息，则获取不到该承载的上下文信息。
若获取到该承载的上下文信息，则SGW-U根据获取的该上下文信息，发送该数据包。具体的，如果该数据包为上行数据包，则SGW-U根据该上下文信息包括的第二隧道在SGW-U的TEID和PGW-U的地址，向该PGW-U发送该上行数据包；如果该数据包为下行数据包，则SGW-U根据该上下文信息包括的第一隧道在SGW-U的TEID和基站的地址，向该基站发送该下行数据包。
步骤403：SGW-U向SGW-C发送触发消息，该触发消息携带SGW-U侧的TEID。
若SGW-U获取不到该承载的上下文信息，则该SGW-U可能丢失了该承载的上下文信息。又由于SGW-U上的各承载的上行文信息都是由SGW-C配置的，所以SGW-C上包括丢失的该承载的上下文信息，SGW-U向SGW-C发送触发消息，以请求恢复丢失的该承载的上下文信息。
其中，SGW-U可以采用面向对象的实现方式来实现，其包括输入接口模块、连接模块、控制模块和输出接口模块等面向对象模块。SGW-U可以通过这些面向对象模块来执行上述步骤401至403，具体实现如下：
参见图4-2，输入接口模块接收该数据包，首先剥离该数据包最外层的IP包头得到GTP-U数据包，根据该IP包头中包括的SGW-U的地址，匹配对应的连接模块，向该连接模块传输出该GTP-U数据包；该连接模块剥离该GTP-U数据包最外层的GTP-U包头得到数据部分，并根据该GTP-U包头中包括的SGW-U侧的TEID，从自身存储的各承载的上下文信息中查找是否有包括该TEID的上下文信息，如果没有包括该TEID的上下文信息，则获取不到该承载的上下文信息，则执行GTP头封装操作，为所述数据部分重新加上所述剥离的GTP-U报头生成GTP-U数据包或者构造错误指示消息，该错误指示消息包含原GTP-U报头中的TEID信息，向控制模块传输该GTP-U数据包或所述错误指示消息；控制模块接收该GTP-U数据包或该错误指示消息，将该GTP-U数据包或该错误指示消息封装成触发消息数据包，向输出接口模块传输该触发 消息数据包；该输出接口模块接收该触发消息数据包，在该触发消息数据包前添加IP包头得到触发消息，该IP包头包括SGW-U的地址和SGW-C的地址，向SGW-C发送该触发消息。可选的，参见下表1，该触发消息的结构如表1所示。
表1
关键信元 说明
Tunnel Endpoint Identifier(TEID) 用户面承载的TEID
步骤404：SGW-C接收该触发消息，根据该触发消息携带的该TEID，获取该承载的上下文信息。
具体地，SGW-C接收该触发消息，根据该触发消息携带的该TEID，从自身存储的上下文信息中查找包括该TEID的上下文信息，并获取查找的该上下文信息，该上下文信息即为该承载的上下文信息。
可选的，该承载的上下文信息可以包括该承载的承载标识，第一隧道在基站侧的TEID和基站的地址以及在SGW-U侧的TEID和SGW-U的地址，第二隧道在SGW-U侧的TEID和SGW-U的地址以及在PGW-U侧的TEID和PGW-U的地址，第一隧道和第二隧道都为该承载中的隧道。
步骤405：SGW-C向SGW-U发送重建承载上下文消息，该重建承载上下文消息携带该承载的上下文信息。
可选的，参见表2，该重建承载上下文消息的结构如表2所示。其中，本端S1接口的TEID和地址可以为第一隧道在基站侧的TEID和基站的地址，对端S1接口的TEID和地址可以为第一隧道在SGW-U侧的TEID和SGW-U的址；本端S5接口的TEID和地址可以为第二隧道在SGW-U侧的TEID和SGW-U的址，对端S5接口的TEID和地址可以为第二隧道在PGW-U侧的TEID和PGW-U的地址。
表2
关键信元 说明
Create 操作类型
EPS Bearer ID EPS承载ID
Local_S1_F-TEID 本端S1接口的TEID和地址
Remote_S1_F-TEID 对端S1接口的TEID和地址
Local_S5_F-TEID 本端S5接口的TEID和地址
Remote_S5_F-TEID 对端S5接口的TEID和地址
其中，需要说明的是：由于UE可能处于空闲态，在空闲态下基站与SGW-U之间的第一隧道释放，SGW-C中存储该承载的上下文信息不是一个完整的上下文信息，该承载的上下文信息中不包括第一隧道的基站侧TEID和基站的地址，但包括第二隧道在SGW-U侧的TEID和SGW-U的地址以及在PGW-U侧的TEID和PGW-U的地址。
当UE从空闲态恢复到连接态时，UE通过服务请求流程(Service Request)来恢复第一隧道，且在SGW-C中恢复该承载的上下文信息。在恢复第一隧道的过程中，SGW-U可能接收到该UE的上行数据包，如果自身没有该承载的上下文信息，则向SGW-C发送触发消息。SGW-C在接收到该触发消息时如果立即获取该承载的上下文信息，可能自身还没有恢复完该承载的上下文信息，导致获取的该承载的上下文信息是一个不完整的上下文信息，因此在接收到该触发消息时先计时，如果计时的时间到达预设时间之前恢复完该承载的上下文信息，则获取恢复的该承载的上下文信息，如果计时的时间到达预设时间时还未恢复该承载的上下文信息，则获取自身保存的该承载的上下文信息。
参见图4-3，在服务请求流程的过程中SGW-U接收到上行数据包的情况下，具体实现为：第一步，UE向基站发送服务请求消息；第二步、基站接收该服务请求消息后向MME转发该服务请求消息；第三步、MME经过授权和验证后，向基站发送S1-AP初始上下文设置请求消息，该请求消息携带了第一隧道在SGW-U侧的TEID和SGW-U的地址；第四步、基站接收该S1-AP初始上下文设置请求消息，建立与UE之间的空口连接，建立完空口连接后向MME发送该S1-AP初始上下文设置完成消息，该S1-AP初始上下文设置完成消息携带第一隧道在基站侧的TEID和基站的地址；第五步、MME接收该S1-AP初始上下文设置完成消息，向SGW-C发送修改承载请求消息，该修改承载请求消息携带第一隧道在基站侧的TEID和基站的地址；第六步、SGW-C接收该修改承载请求消息，将该第一隧道在基站侧的TEID和基站的地址存储在该TEID对应承载的上下文信息中，这样恢复了该承载的上下文信息。
其中，UE建立完与基站之间的空口连接后，就可以向基站发送上行数据包，基站接收该上行数据包，并向SGW-U发送该上行数据包。SGW-U接收该上行数据包，根据该上行数据包携带的TEID，获取不到该TEID对应承载的上 下文信息，向SGW-C发送触发消息。
SGW-C可能在接收MME发送的修改承载请求消息之前接收到SGW-U发送的触发消息，如果此时立即获取该承载的上下文信息，可能获取的是个不完整的上下文信息，所以可以在接收到该触发消息时开始起动一个计时器，用于等待MME发送的承载修改请求消息的到达，该修改承载请求消息携带基站与所述SGW-U之间的第一隧道在基站侧的TEID和基站的地址，若在计时器计时的时间到达预设时间之前接收到MME发送的修改承载请求消息，则将基站与所述SGW-U之间的第一隧道在基站侧的TEID和基站的地址补充到该TEID对应承载的上下文信息中；根据所述触发消息携带的TEID，从存储的上下文信息中获取对应的承载的上下文信息，然后向SGW-U发送重建承载上下文消息，该重建承载上下文信息携带所述承载的上下文信息。
如果在计时器计时的时间到达预设时间时还未接收到MME发送的修改承载请求消息，则SGW-C根据该触发消息携带的TEID，从自身存储的上下文信息中获取该承载的上下文信息，向SGW-U发送重建承载上下文消息，该重建承载上下文信息携带所述承载的上下文信息。
步骤406：SGW-U接收该重建承载上下文消息，根据该重建承载上下文消息携带的该上下文信息发送该数据包。
具体的，SGW-U接收该重建承载上下文消息，如果该数据包为上行数据包，则SGW-U根据该上下文信息包括的第二隧道在SGW-U的TEID和PGW-U的地址，向该PGW-U发送该上行数据包；如果该数据包为下行数据包，则SGW-U根据该上下文信息包括的第一隧道在SGW-U的TEID和基站的地址，向该基站发送该下行数据包。
可选的，在服务请求流程的过程中如果SGW-U未接收到上行数据包，则可以按如下方式恢复SGW-C中的承载的上下文信息，包括：
参见图4-4，UE按上述第一至第六六步发起服务请求流程，并在SGW-C中恢复承载的上下文信息。然后SGW-C向SGW-U发送修改承载请求消息，该修改承载请求消息携带该承载的承载标识；SGW-U接收该承载修改请求消息，如果根据该承载修改请求消息携带的该承载标识确定出自身没有该承载的上下文信息，则向SGW-C发送修改承载响应消息，该修改承载响应消息携带该承载标识以及失败指示消息，该失败指示消息指示找不到相应的承载上下文信息；SGW-C接收该修改承载响应消息，向SGW-U发送重建承载上下文消息， 该重建承载上下文消息携带该承载标识对应承载的上下文信息。
在本发明实施例中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，向发SGW-C发送触发消息，请求获取该承载的上下文信息，这样可以根据获取的上下文信息发送数据包，防止用户的业务中断，促进用户体验。
参见图5，本发明实施例提供了一种发送数据包的装置500，所述装置包括：
接收单元501，用于接收数据包，根据所述数据包携带的TEID匹配对应承载的上下文信息；
发送单元502，用于如果匹配出所述装置500中没有所述承载的上下文信息，则向SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
所述接收单元501，还用于接收所述SGW-C发送的重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；
所述发送单元502，还用于根据所述承载的上下文信息，发送所述数据包。
可选的，所述接收单元501，还用于接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
所述发送单元502，还用于如果所述装置中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带所述承载标识和用于指示所述装置中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
所述接收单元501，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
在本发明实施例中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，向发SGW-C发送触发消息，请求获取该承载的上下文信息，这样可以根据获取的上下文信息发送数据包，防止用户的业务中断，促进用户体验。
参见图6，本发明实施例提供了一种发送数据包的装置600，所述装置包 括：
接收单元601，用于接收SGW-U发送的触发消息，所述触发消息携带TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且确定自身没有所述TEID对应承载的上下文信息后发送的；
处理单元602，用于根据所述TEID，获取所述承载的上下文信息；
发送单元603，用于向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
可选的，所述处理单元602，用于在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址，则将所述基站侧TEID和基站的地址更新到自身存储的所述TEID对应承载的上下文信息中；根据所述TEID，从存储的上下文信息中获取所述更新后的所述承载的上下文信息。
可选的，所述处理单元602，用于若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
可选的，所述接收单元601，还用于接收移动终端管理实体MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址；
所述发送单元603，还用于向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述承载的上下文信息。
可选的，所述发送单元603，还用于向所述SGW-U发送修改承载请求消息，所述修改承载请求消息携带承载标识，所述承载标识用于所述SGW-U确定自身是否有所述承载的上下文信息；
所述接收单元601，还用于接收所述SGW-U在确定没有所述承载的上下文信息时发送的修改承载响应消息。
在本发明实施例中，由于当匹配出SGW-U中没有该TEID对应的承载的上下文信息时，SGW-C向SGW-U发送该承载的上下文信息，这样可以SGW-U根据该上下文信息发送数据包，防止用户的业务中断，促进用户体验。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种发送数据包的方法，其特征在于，所述方法包括：
    用户面服务网关SGW-U接收数据包，根据所述数据包携带的隧道端点标识TEID匹配对应承载的上下文信息；
    如果匹配出所述SGW-U中没有所述承载的上下文信息，则向控制面服务网关SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
    接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；
    根据所述承载的上下文信息，发送所述数据包。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
    如果所述SGW-U中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带所述承载标识和用于指示所述SGW-U中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
    接收所述SGW-C发送的重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
  3. 一种发送数据包的方法，其特征在于，所述方法包括：
    控制面服务网关SGW-C接收用户面服务网关SGW-U发送的触发消息，所述触发消息携带隧道端点标识TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且匹配出自身没有所述TEID对应承载的上下文信息后发送的；
    根据所述TEID，获取所述承载的上下文信息；
    向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
  4. 如权利要求3所述的方法，其特征在于，根据所述TEID，获取所述承载的上下文信息，包括：
    在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到移动性管理实体MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和基站的地址，则将所述基站侧TEID和所述基站的地址存储到自身存储的所述TEID对应承载的上下文信息中；
    根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
  5. 如权利要求4所述的方法，其特征在于，所述根据所述TEID，获取所述承载的上下文信息，还包括：
    若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
  6. 一种发送数据包的装置，其特征在于，所述装置包括：
    接收单元，用于接收数据包，根据所述数据包携带的隧道端点标识TEID匹配对应承载的上下文信息；
    发送单元，用于如果匹配出所述装置中没有所述承载的上下文信息，则向控制面服务网关SGW-C发送触发消息，所述触发消息携带所述TEID，所述触发消息用于所述SGW-C根据所述TEID获取所述承载的上下文信息；
    所述接收单元，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息；
    所述发送单元，还用于根据所述承载的上下文信息，发送所述数据包。
  7. 如权利要求6所述的装置，其特征在于，
    所述接收单元，还用于接收所述SGW-C发送的修改承载请求消息，所述修改承载请求消息携带承载标识；
    所述发送单元，还用于如果所述装置中没有所述承载标识对应承载的上下文信息，则向所述SGW-C发送修改承载响应消息，所述修改承载响应消息携带 所述承载标识和用于指示所述装置中没有所述上下文信息的指示信息，所述修改承载响应消息用于所述SGW-C根据所述承载标识获取所述承载的上下文信息；
    所述接收单元，还用于接收所述SGW-C发送重建承载上下文消息，所述重建承载上下文消息携带所述承载的上下文信息。
  8. 一种发送数据包的装置，其特征在于，所述装置包括：
    接收单元，用于接收用户面服务网关SGW-U发送的触发消息，所述触发消息携带隧道端点标识TEID，所述触发消息是所述SGW-U在接收到携带所述TEID的数据包且匹配出自身没有所述TEID对应承载的上下文信息后发送的；
    处理单元，用于根据所述TEID，获取所述承载的上下文信息；
    发送单元，用于向所述SGW-U发送重建承载上下文消息，所述重建承载上下消息携带所述上下文信息，所述重建承载上下文信息用于所述SGW-U根据所述上下文信息发送所述数据包。
  9. 如权利要求8所述的装置，其特征在于，
    所述处理单元，用于在接收到所述触发消息时开始计时，若在计时的时间到达预设时间之前接收到移动性管理实体MME发送的修改承载请求消息，所述修改承载请求消息携带基站与所述SGW-U之间的第一隧道的基站侧TEID和所述基站的地址，则将所述基站侧TEID和所述基站的地址存储到自身存储的所述TEID对应承载的上下文信息中；根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
  10. 如权利要求9所述的装置，其特征在于，所述处理单元，还用于若在所述计时的时间到达所述预设时间时未接收到所述MME发送的修改承载请求消息，则根据所述TEID，从存储的上下文信息中获取所述承载的上下文信息。
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