WO2016090923A1 - Lipa/sipto连接的建立方法和装置 - Google Patents

Lipa/sipto连接的建立方法和装置 Download PDF

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Publication number
WO2016090923A1
WO2016090923A1 PCT/CN2015/084730 CN2015084730W WO2016090923A1 WO 2016090923 A1 WO2016090923 A1 WO 2016090923A1 CN 2015084730 W CN2015084730 W CN 2015084730W WO 2016090923 A1 WO2016090923 A1 WO 2016090923A1
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WO
WIPO (PCT)
Prior art keywords
lipa
terminal
base station
sipto
pdn connection
Prior art date
Application number
PCT/CN2015/084730
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English (en)
French (fr)
Inventor
徐雯
郑芳庭
Original Assignee
中兴通讯股份有限公司
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Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2016090923A1 publication Critical patent/WO2016090923A1/zh

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    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release

Definitions

  • the present invention relates to the field of communications, and in particular, to a LIPA (Local IP Access)/SIPTO (Selected IP Traffic Offload) connection establishment method and apparatus.
  • LIPA Local IP Access
  • SIPTO Select IP Traffic Offload
  • LIPA Local IP Access
  • SIPTO Select IP Traffic Offload
  • LIPA is used for HeNB
  • SIPTO can be used for HeNB
  • macro network and also for macro network.
  • the problems of LIPA and SIPTO@LN SIPTO over the Local Network
  • the network architecture is basically the same.
  • the LGW Local Gateway
  • P-GW Packet Data Network Gateway
  • the LGW is integrated with the HeNB to implement user traffic data. Access directly from the base station without going through the P-GW of the core network.
  • the LIPA/SIPTO connection can be initiated after the normal packet data network (PDN) connection has been created.
  • PDN packet data network
  • the normal PDN connection that has been created cannot be updated to the LIPA/SIPTO connection in real time.
  • the continuous online feature of the LTE (Long Term Evolution) network makes the established bearer unable to fully utilize the offload resources brought by LIPA.
  • the embodiment of the invention provides a method and a device for establishing a LIPA/SIPTO connection, so as to at least solve the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.
  • a method for establishing a LIPA/SIPTO connection including:
  • the Mobile Management Entity obtains the public data network PDN connection of the terminal on the base station according to a preset policy.
  • the method before acquiring the PDN connection of the terminal on the base station according to the preset policy, the method further includes: receiving indication information sent by the base station, where the indication information is used to indicate that the base station supports LIPA. /SIPTO function; obtaining the PDN connection of the terminal on the base station according to a preset policy, comprising: when determining, according to the indication information, that the base station supports the LIPA/SIPTO function, triggering acquiring the terminal at the base station PDN connection; or,
  • Acquiring the PDN connection of the terminal on the base station according to the preset policy includes: receiving a control instruction that carries the identifier of the base station, and determining, according to the indication information, that the base station supports the LIPA/SIPTO function, according to the control instruction Obtaining a PDN connection of the terminal on the base station corresponding to the base station identifier.
  • the MME receiving the indication information sent by the base station includes:
  • an uplink non-access stratum NAS direct transmission message Receiving, by the base station, an uplink non-access stratum NAS direct transmission message, where the uplink NAS direct transmission message carries the indication information.
  • the method before releasing the PDN connection corresponding to the terminal, the method further includes:
  • the releasing the PDN connection corresponding to the terminal includes: triggering release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the method further includes:
  • a device for establishing a local IP access LIPA/select IP traffic offload SIPTO connection is further provided, which is applied to an MME, and the device includes:
  • Obtaining a module configured to acquire a PDN connection of the public data network of the terminal at the base station according to a preset policy, and obtain subscription information of the terminal, where the subscription information is used by the base station to support the LIPA/SIPTO function. Indicates whether the terminal supports the LIPA/SIPTO function;
  • a processing module configured to release a PDN connection corresponding to the terminal when the terminal supports the LIPA/SIPTO function according to the subscription information acquired by the acquiring module;
  • the connection module is configured to establish a LIPA/SIPTO connection with the LGW if the terminal re-initiates the PDN connection request after the processing module releases the PDN connection.
  • the method further includes: a receiving module, configured to receive the indication information sent by the base station, and receive the control instruction that carries the identifier of the base station, where the indication information is used to indicate that the base station supports the LIPA/SIPTO function;
  • the acquiring module is configured to: when determining, according to the indication information received by the receiving module, that the base station supports the LIPA/SIPTO function, triggering acquiring a PDN connection of the terminal at the base station; and receiving according to the receiving module The control command acquires a PDN connection of the terminal on the base station corresponding to the base station identifier.
  • the receiving module is further configured to: receive an initial terminal message sent by the base station, where the initial terminal message carries the indication information; and receive an uplink non-access sent by the base station The layer NAS direct transmission message, wherein the uplink NAS direct transmission message carries the indication information.
  • the acquiring module is further configured to: obtain the LIPA/SIPTO connection priority information locally configured before the processing module releases the PDN connection corresponding to the terminal; and obtain the subscription information according to the terminal.
  • the processing module is configured to trigger release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the acquiring module is further configured to: after determining that the base station supports the LIPA/SIPTO function according to the indication information, acquiring a PDN connection of the remaining terminals except the terminal on the base station Obtaining the subscription information of the remaining terminals, where the subscription information is used to indicate whether the remaining terminals support the LIPA/SIPTO function;
  • the processing module is further configured to: when determining, according to the subscription information acquired by the acquiring module, that the remaining terminals support the LIPA/SIPTO function, releasing the PDN connection corresponding to the remaining terminals;
  • the connection module is further configured to: after the processing module releases the PDN connection corresponding to the remaining terminals, if the remaining terminals re-initiate the PDN connection request, establish a LIPA/SIPTO connection with the LGW.
  • the base station after adding the LIPA/SIPTO function, can release the current normal PDN connection in real time, and complete the establishment of the LIPA/SIPTO connection after the terminal re-initiates the PDN connection request, so that the base station increases the LIPA/SIPTO.
  • the current normal PDN connection can be released in real time, and the LIPA/SIPTO connection is established after the terminal re-initiates the PDN connection request, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.
  • FIG. 1 is a schematic diagram of a LIPA/SIPTO networking according to the prior art
  • FIG. 2 is a schematic diagram of a method for establishing a LIPA/SIPTO connection according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of signaling interaction for establishing a PDN connection procedure according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a signaling interaction of a bearer deactivation process according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of signaling interaction of a detach process according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of signaling interaction for establishing a LIPA/SIPTO connection procedure according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of another method for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of another method for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of another method for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a device for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of another apparatus for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • the network includes: a terminal, a base station, an MME, an SGW (Serving Gateway), an HSS (Home Subscriber Server), and an LGW (Local Gateway).
  • the terminal is connected to the base station.
  • the base station may be a home base station, and the LGW is deployed on the base station, the base station is connected to the MME, and the SGW is connected to the LGW, and the MME is respectively connected to the SGW and the HSS.
  • FIG. 2 is a flowchart of a method for establishing a LIPA/SIPTO connection according to an embodiment of the present invention. As shown in FIG. 2, the process includes the following steps:
  • the MME obtains a PDN (Public Data Network) connection of the terminal on the base station according to a preset policy.
  • PDN Public Data Network
  • the subscription information is used to indicate whether the terminal supports the LIPA/SIPTO function
  • the base station can release the current normal PDN connection in real time, and complete the establishment of the LIPA/SIPTO connection after the terminal re-initiates the PDN connection request, thereby solving the problem that the normal PDN connection cannot be updated in real time.
  • the indication information sent by the base station is received, where the indication information is used to indicate that the base station supports the LIPA/SIPTO function, and is based on
  • the indication information determines that the base station supports the LIPA/SIPTO function, triggering obtaining the PDN connection of the terminal at the base station;
  • the MME obtains the PDN connection on the base station by using two implementation manners when the MME determines that the base station supports the LIPA/SIPTO function according to the indication information, where the MME includes:
  • Manner 1 When the MME determines that the base station supports the LIPA/SIPTO function according to the indication information, the MME triggers obtaining the PDN connection of the terminal at the base station.
  • the MME receives the control command that carries the identifier of the base station, and when determining, according to the indication information, that the base station supports the LIPA/SIPTO function, obtains the PDN connection of the terminal on the base station corresponding to the base station identifier according to the control command.
  • the difference between the first mode and the second mode is that the MME can obtain the PDN connection of the terminal at the base station when determining that the base station supports the LIPA/SIPTO function, and the second method is that the MME needs to be in the MME.
  • the control command such as the network management manual control
  • the PDN connection of the terminal on the base station corresponding to the base station identifier is obtained.
  • the signaling process of the PDN connection includes:
  • the terminal sends a connection request message to the base station.
  • the base station sends the connection request message to the MME.
  • the MME After receiving the connection request message, the MME sends a create session request to the SGW.
  • the SGW sends the create session request to the PGW.
  • the PGW After receiving the creation session request, the PGW sends a create session response to the SGW.
  • the SGW sends the create session response to the MME.
  • the MME After receiving the create session response, the MME sends an initial context setup request to the base station.
  • the base station receives the initial context setup request, and sends a create bearer message to the terminal.
  • the terminal creates a PDN connection by using the base station according to the create bearer request.
  • the initial terminal message sent by the base station is received, where the initial terminal message carries the indication information;
  • the base station Receiving an uplink NAS (Non-access Stratum) direct transmission message sent by the base station, where the uplink NAS direct transmission message carries the indication information.
  • NAS Non-access Stratum
  • the MME determines that the base station supports the LIPA/SIPTO function after receiving the initial terminal message or the uplink NAS message.
  • the MME may complete the release of the PDN connection by using a bearer deactivation process or a detach process.
  • the bearer deactivation process is initiated.
  • the detach process is initiated, thereby releasing the The PDN connection corresponding to the terminal, as shown in FIG. 4, the signaling process of the bearer deactivation includes:
  • the MME sends a delete bearer command to the SGW.
  • the SGW sends the delete bearer command to the PGW.
  • the PGW After receiving the delete bearer command, the PGW sends a delete bearer request to the SGW.
  • the SGW sends the delete bearer request to the MME.
  • the MME After receiving the delete bearer request, the MME sends a bearer deactivation request to the base station.
  • the base station sends the bearer deactivation request to the terminal.
  • the reason value of the bearer deactivation request is re-created.
  • the terminal determines that the cause value is re-created, the terminal re-initiates the PDN connection request after releasing the current PDN connection.
  • the terminal After receiving the bearer deactivation request, the terminal sends a bearer deactivation response to the base station.
  • the base station sends the bearer deactivation response to the MME.
  • the MME After receiving the bearer deactivation response, the MME sends a delete bearer response to the SGW.
  • the SGW sends the delete bearer response to the PGW.
  • the detachment signaling process includes:
  • the MME sends a delete bearer command to the SGW.
  • the SGW sends the delete bearer command to the PGW.
  • the PGW After receiving the delete bearer command, the PGW sends a delete bearer request to the SGW.
  • the SGW sends the delete bearer request to the MME.
  • the MME After receiving the delete bearer request, the MME sends a detach request to the base station.
  • the base station sends the detach request to the terminal.
  • the reason value in the detach request is re-created.
  • the terminal determines that the cause value is re-created, the terminal re-initiates the PDN connection request after releasing the current PDN connection.
  • the terminal After receiving the detach request, the terminal sends a detach response to the base station.
  • the base station sends the detachment response to the MME.
  • the SGW sends the delete bearer response to the PGW.
  • the locally configured LIPA/SIPTO connection priority information is obtained, and the PDN connection corresponding to the terminal is triggered according to the LIPA/SIPTO connection priority information; or the LIPA/SIPTO connection is obtained according to the subscription information of the terminal.
  • Priority information, and triggering release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information are obtained, and the PDN connection corresponding to the terminal is triggered according to the LIPA/SIPTO connection priority information.
  • the LIPA/SIPTO connection priority information may be configured in the MME or may be configured in the subscription information of the terminal.
  • the MME may obtain the local configuration.
  • the LIPA/SIPTO connection priority information when the LIPA/SIPTO connection priority information is configured in the subscription information of the terminal, the MME may obtain the subscription information of the terminal from the HSS, and obtain the LIPA/SIPTO connection priority from the subscription information. information.
  • the establishment process of the LIPA/SIPTO connection includes:
  • the terminal sends a connection request message to the base station.
  • the base station sends the connection request message to the MME.
  • the MME After receiving the connection request message, the MME sends a create session request to the SGW.
  • the SGW sends the create session request to the LGW.
  • the LGW After receiving the creation session request, the LGW sends a create session response to the SGW.
  • the SGW sends the create session response to the MME.
  • the MME After receiving the create session response, the MME sends an initial context setup request to the base station.
  • the base station receives the initial context setup request, and sends a create bearer message to the terminal.
  • the terminal creates a LIPA/SIPTO connection by using the base station according to the create bearer request.
  • the base station after determining that the base station supports the LIPA/SIPTO function according to the indication information, acquiring a PDN connection of the remaining terminals of the base station except the terminal, and acquiring subscription information of the remaining terminals, where the subscription information is obtained.
  • the information is used to indicate whether the remaining terminals support the LIPA/SIPTO function.
  • the PDN connection corresponding to the remaining terminals is released, and the PDN corresponding to the remaining terminals is released.
  • the remaining terminals re-initiate the PDN connection request, establish a LIPA/SIPTO connection with the LGW.
  • the base station when the base station adds the LIPA/SIPTO function, it can also decide whether it is necessary to release the PDN connection of the remaining terminals on the base station and establish a LIPA/SIPTO connection, thereby updating the normal PDN connection of all terminals on the base station to the real-time in real time. LIPA/SIPTO connection.
  • FIG. 7 is a flowchart of a method for establishing a LIPA/SIPTO connection according to another embodiment of the present invention.
  • the application scenario of the embodiment is that the terminal moves from a base station that does not support the LIPA/SIPTO function to In the base station supporting the LIPA/SIPTO function, in this embodiment, the base station that does not support the LIPA/SIPTO function is recorded as the first base station, and the base station that supports the LIPA/SIPTO function is recorded as the second base station, and the process includes the following steps:
  • the terminal creates a PDN connection with the PGW through the first base station.
  • the terminal moves from the first base station to the second base station, and migrates the PDN connection to the second base station.
  • the terminal sends a location update message to the second base station.
  • the second base station After receiving the location update message, the second base station sends an initial terminal message carrying the LGW address to the MME.
  • the sending, by the second base station, the initial terminal message carrying the LGW address to the MME indicates that the second base station supports the LIPA/SIPTO function.
  • the MME obtains a PDN connection of the terminal on the second base station when the second base station supports the LIPA/SIPTO function according to the initial terminal message that carries the LGW address.
  • the MME obtains subscription information of the terminal corresponding to the PDN connection from the HSS.
  • the subscription information indicates that the terminal supports the LIPA/SIPTO function.
  • the MME obtains the locally configured LIPA/SIPTO connection priority information, and triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information; or obtains the LIPA/SIPTO according to the subscription information of the terminal.
  • the priority information is connected, and the PDN connection corresponding to the terminal is triggered according to the LIPA/SIPTO connection priority information.
  • the LIPA/SIPTO connection priority information may be configured in the MME or may be configured in the subscription information of the terminal.
  • the MME may obtain the local configuration.
  • the LIPA/SIPTO connection priority information when the LIPA/SIPTO connection priority information is configured in the subscription information of the terminal, the MME may obtain the subscription information of the terminal from the HSS, and obtain the LIPA/SIPTO connection priority from the subscription information. information.
  • the MME releases the PDN connection corresponding to the terminal when the terminal determines that the terminal supports the LIPA/SIPTO function according to the subscription information.
  • the MME triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the MME initiates a bearer deactivation process or initiates a detach procedure to release a PDN connection corresponding to the terminal.
  • the bearer deactivation process is initiated.
  • the detach process is initiated, thereby releasing the The PDN connection corresponding to the terminal, wherein the bearer deactivation process may refer to the process shown in FIG. 4, and the detach process may refer to the process shown in FIG. 5, and details are not described herein again.
  • the MME After releasing the PDN connection, if the terminal re-initiates the PDN connection establishment request, the MME establishes a LIPA/SIPTO connection with the LGW according to the LGW address.
  • the terminal determines that the cause value in the bearer deactivation request or the detach request received during the release of the PDN connection is re-created, the terminal re-initiates the PDN connection request.
  • the MME can determine that the second base station supports the LIPA/SIPTO function according to the initial terminal message that carries the LGW address sent by the second base station, so that the terminal can release the LIPA/SIPTO function in real time.
  • the current normal PDN connection and after the terminal re-initiates the PDN connection request, completes the establishment of the LIPA/SIPTO connection, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.
  • FIG. 8 is a flowchart of a method for establishing a LIPA/SIPTO connection according to another embodiment of the present invention. As shown in FIG. 8, the process includes the following steps:
  • the terminal creates a PDN connection with the PGW through the base station.
  • the base station sends an initial terminal message carrying the LGW address or an uplink NAS direct transmission message carrying the LGW address to the MME, and sends the message to the MME.
  • the sending, by the base station, the initial terminal message carrying the LGW address or the uplink NAS direct transmission message to the MME indicates that the base station currently supports the LIPA/SIPTO function.
  • the MME obtains a PDN connection of the terminal on the base station when the base station supports the LIPA/SIPTO function according to the initial terminal message carrying the LGW address or the uplink NAS direct transmission message.
  • the MME obtains subscription information of the terminal corresponding to the PDN connection from the HSS.
  • the subscription information indicates that the terminal supports the LIPA/SIPTO function.
  • the MME obtains the locally configured LIPA/SIPTO connection priority information, and triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information; or obtains the LIPA/SIPTO according to the subscription information of the terminal.
  • the priority information is connected, and the PDN connection corresponding to the terminal is triggered according to the LIPA/SIPTO connection priority information.
  • the LIPA/SIPTO connection priority information may be configured in the MME or may be configured in the subscription information of the terminal.
  • the MME may obtain the local configuration.
  • the LIPA/SIPTO connection priority information when the LIPA/SIPTO connection priority information is configured in the subscription information of the terminal, the MME may obtain the subscription information of the terminal from the HSS, and obtain the LIPA/SIPTO connection priority from the subscription information. information.
  • the MME releases the PDN connection corresponding to the terminal when the terminal determines that the terminal supports the LIPA/SIPTO function according to the subscription information.
  • the MME triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the MME initiates a bearer deactivation process or initiates a detach process.
  • the bearer deactivation process is initiated.
  • the detach process is initiated, thereby releasing the The PDN connection corresponding to the terminal, wherein the bearer deactivation process may refer to the process shown in FIG. 4, and the detach process may refer to the process shown in FIG. 5, and details are not described herein again.
  • the MME After releasing the PDN connection, if the terminal re-initiates the PDN connection establishment request, the MME establishes a LIPA/SIPTO connection with the LGW according to the LGW address.
  • the terminal determines that the cause value in the bearer deactivation request or the detach request received during the release of the PDN connection is re-created, the terminal re-initiates the PDN connection request.
  • the base station after determining that the base station supports the LIPA/SIPTO function, acquiring a PDN connection of the remaining terminals of the base station except the terminal, and acquiring subscription information of the remaining terminals, where the subscription information is used. Indicates whether the remaining terminals support the LIPA/SIPTO function, and when determining that the remaining terminals support the LIPA/SIPTO function according to the subscription information, release the PDN connection corresponding to the remaining terminals, and release the After the PDN connection of the remaining terminal, if the remaining terminals re-initiate the PDN connection request, establish a LIPA/SIPTO connection with the LGW.
  • the base station when the base station adds the LIPA/SIPTO function, it can also decide whether it is necessary to release the PDN connection of the remaining terminals on the base station and establish a LIPA/SIPTO connection, thereby updating the normal PDN connection of all terminals on the base station to the real-time in real time. LIPA/SIPTO connection.
  • the MME can determine that the base station supports the LIPA/SIPTO function according to the initial terminal message or the uplink NAS direct transmission message that is sent by the base station, so that the current normal PDN connection can be released in real time, and the PDN connection is re-initiated in the terminal.
  • the establishment of the LIPA/SIPTO connection is completed, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.
  • FIG. 9 is a flowchart of a method for establishing a LIPA/SIPTO connection according to another embodiment of the present invention. As shown in FIG. 9, in the embodiment of the present invention, the network management learns that the current base station supports LIPA/SIPTO, and the process includes the following steps. step:
  • the terminal creates a PDN connection with the PGW through the base station.
  • the MME acquires a control instruction that carries the identifier of the base station.
  • the control command can be manually controlled by the network management system.
  • the network management system can enable the switch set on the MME, so that the MME obtains the control command.
  • the MME obtains, according to the control instruction, a PDN connection of the terminal on the base station corresponding to the base station identifier.
  • the MME obtains subscription information of the terminal corresponding to the PDN connection from the HSS.
  • the subscription information indicates that the terminal supports the LIPA/SIPTO function.
  • the MME obtains the locally configured LIPA/SIPTO connection priority information, and triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information; or obtains the LIPA/SIPTO according to the subscription information of the terminal.
  • the priority information is connected, and the PDN connection corresponding to the terminal is triggered according to the LIPA/SIPTO connection priority information.
  • the LIPA/SIPTO connection priority information may be configured in the MME or may be configured in the subscription information of the terminal.
  • the MME may obtain the local configuration.
  • the LIPA/SIPTO connection priority information when the LIPA/SIPTO connection priority information is configured in the subscription information of the terminal, the MME may obtain the subscription information of the terminal from the HSS, and obtain the LIPA/SIPTO connection priority from the subscription information. information.
  • the MME triggers release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the MME initiates a bearer deactivation process or initiates a detach process.
  • the bearer deactivation process is initiated.
  • the detach process is initiated, thereby releasing the The PDN connection corresponding to the terminal, wherein the bearer deactivation process may refer to the process shown in FIG. 4, and the detach process may refer to the process shown in FIG. 5, and details are not described herein again.
  • the MME After releasing the PDN connection, if the terminal re-initiates the PDN connection establishment request, the MME establishes a LIPA/SIPTO connection with the LGW according to the LGW address.
  • the terminal determines that the cause value in the bearer deactivation request or the detach request received during the release of the PDN connection is re-created, the terminal re-initiates the PDN connection request.
  • the base station after determining that the base station supports the LIPA/SIPTO function, acquiring a PDN connection of the remaining terminals of the base station except the terminal, and acquiring subscription information of the remaining terminals, where the subscription information is used.
  • the PDN connection corresponding to the remaining terminals is released, and after the PDN connection corresponding to the remaining terminals is released, If the remaining terminals re-initiate the PDN connection request, establish a LIPA/SIPTO connection with the LGW.
  • the base station when the base station adds the LIPA/SIPTO function, it can also decide whether it is necessary to release the PDN connection of the remaining terminals on the base station and establish a LIPA/SIPTO connection, thereby updating the normal PDN connection of all terminals on the base station to the real-time in real time. LIPA/SIPTO connection.
  • the MME After receiving the control command, the MME completes the establishment of the LIPA/SIPTO connection, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.
  • a device for establishing a LIPA/SIPTO connection is also provided, which is used to implement the foregoing embodiments and preferred embodiments, and details are not described herein.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 10 is a structural block diagram of a device for establishing a LIPA/SIPTO connection according to an embodiment of the present invention.
  • the device is applied to an MME.
  • the device 100 includes:
  • the obtaining module 101 is configured to: when the base station supports the LIPA/SIPTO function, obtain the PDN connection of the public data network of the terminal at the base station according to a preset policy, and obtain subscription information of the terminal, where the subscription information is used to indicate the Whether the terminal supports the LIPA/SIPTO function;
  • the processing module 102 is configured to release the PDN connection corresponding to the terminal when the terminal supports the LIPA/SIPTO function according to the subscription information acquired by the acquiring module 101.
  • the connection module 103 is configured to establish a LIPA/SIPTO connection with the LGW if the terminal re-initiates the PDN connection request after the processing module 102 releases the PDN connection.
  • the device 100 further includes:
  • the receiving module 104 is configured to receive the indication information sent by the base station, and receive the control instruction that carries the identifier of the base station, where the indication information is used to indicate that the base station supports the LIPA/SIPTO function;
  • the obtaining module 101 is configured to: when determining, according to the indication information received by the receiving module 104, that the base station supports the LIPA/SIPTO function, triggering acquiring the PDN connection of the terminal at the base station; and acquiring according to the control instruction received by the receiving module 104.
  • the terminal is connected to the PDN on the base station corresponding to the base station identifier. In this way, the MME can acquire the PDN connection of the terminal at the base station in different manners, thereby flexibly establishing the LIPA/SIPTO connection.
  • the receiving module 104 is configured to receive an initial terminal message sent by the base station, where the initial terminal message carries the indication information; and receive an uplink non-access stratum NAS direct transmission message sent by the base station.
  • the uplink NAS direct transmission message carries the indication information.
  • the obtaining module 101 is further configured to: obtain the LIPA/SIPTO connection priority information locally configured before the processing module 102 releases the PDN connection corresponding to the terminal; and obtain the LIPA according to the subscription information of the terminal. /SIPTO connection priority information;
  • the processing module 102 is configured to trigger release of the PDN connection corresponding to the terminal according to the LIPA/SIPTO connection priority information.
  • the LIPA/SIPTO connection priority information may be configured in the MME or may be configured in the subscription information of the terminal.
  • the MME may obtain the local configuration.
  • the LIPA/SIPTO connection priority information when the LIPA/SIPTO connection priority information is configured in the subscription information of the terminal, the MME may obtain the subscription information of the terminal from the HSS, and obtain the LIPA/SIPTO connection priority from the subscription information. information.
  • the acquiring module 101 is further configured to: after determining that the base station supports the LIPA/SIPTO function according to the indication information, acquiring a PDN connection of the remaining terminals of the base station except the terminal, and acquiring the remaining The subscription information of the terminal, wherein the subscription information is used to indicate whether the remaining terminals support the LIPA/SIPTO function;
  • the processing module 102 is further configured to: when determining, according to the subscription information acquired by the acquiring module 101, that the remaining terminals support the LIPA/SIPTO function, releasing the PDN connection corresponding to the remaining terminals;
  • the connection module 103 is further configured to establish a LIPA/SIPTO connection with the LGW if the remaining terminals re-initiate the PDN connection request after the processing module 102 releases the PDN connection corresponding to the remaining terminals.
  • the base station when the base station adds the LIPA/SIPTO function, it can also decide whether it is necessary to release the PDN connection of the remaining terminals on the base station and establish a LIPA/SIPTO connection, thereby updating the normal PDN connection of all terminals on the base station to the real-time in real time. LIPA/SIPTO connection.
  • the current normal PDN connection can be released in real time, and the LIPA/SIPTO connection is established after the terminal re-initiates the PDN connection request, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time. .
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the terminal moves from a base station that does not support LIPA/SIPTO to a base station that supports the LIPA/SIPTO function, or the base station newly deploys the LIPA/ The scenario of the SIPTO function.
  • the main steps include the following:
  • Step 1 A normal PDN connection has been created.
  • the terminal moves from a base station that does not support LIPA/SIPTO to a base station that supports LIPA/SIPTO functions, or the base station newly deploys the LIPA/SIPTO function.
  • Step 2 The MME determines whether to release the normal PDN connection according to the LIPA/SIPTO capability of the base station, whether the terminal subscription information supports LIPA/SIPTO, and whether the local office configures the LIPA/SIPTO priority.
  • the LIPA/SIPTO priority subscription item may also be added to the terminal subscription information.
  • the MME determines whether to release the normal PDN connection according to whether the terminal subscribes to the LIPA/SIPTO priority, and triggers the terminal to re-initiate the creation, thereby establishing a LIPA/SIPTO connection.
  • the MME may manually release the normal PDN connection by using the network management system according to the identifier of the base station.
  • Step 3 The user initiates a new PDN connection request and establishes a LIPA/SIPTO connection.
  • it may be determined whether the current terminal needs to establish a LIPA/SIPTO connection, or may re-determine whether a LIPA/SIPTO connection needs to be established for all bearer connections under the base station.
  • the base station after adding the LIPA/SIPTO function, can release the current normal PDN connection in real time, and complete the establishment of the LIPA/SIPTO connection after the terminal re-initiates the PDN connection request, so that the base station increases the LIPA/SIPTO.
  • the current normal PDN connection can be released in real time, and the LIPA/SIPTO connection is established after the terminal re-initiates the PDN connection request, thereby solving the technical problem that the normal PDN connection cannot be updated to the LIPA/SIPTO connection in real time.

Abstract

本发明公开了一种LIPA/SIPTO连接的建立方法和装置。其中，该方法包括：在基站支持LIPA/SIPTO功能时，MME按照预设策略获取该终端在该基站上的PDN连接(S202)，获取该终端的签约信息(S204)，在根据该签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接(S206)；在释放该PDN连接后，若该终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接(S208)。本发明解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。

Description

LIPA/SIPTO连接的建立方法和装置 技术领域
本发明涉及通信领域，具体而言，涉及一种LIPA(Local IP Access，本地IP接入)/SIPTO(Selected IP Traffic Offload，选择IP流量卸载)连接的建立方法和装置。
背景技术
随着移动互联网的快速发展，新的业务和应用在给用户带来更为丰富体验的同时，用户数量的增加和用户数据传输速率的提高都对核心网络的网元性能提出了更高要求。LIPA(Local IP Access，本地IP接入)和SIPTO(Selected IP Traffic Offload，选择IP流量卸载)技术最初是基于HeNB(Home enhanced NodeB，家庭基站)而提出的。LIPA和SIPTO技术是对HeNB功能的增强，用户数据传递完全可以直接通过HeNB实现，无需再传递到运营商的核心网络，业务直接从HeNB分流出去，这样在减少数据传递时延的同时，也减少了核心网络的负荷和传输成本，运营商可以将核心网有限的资源最大化利用，为有价值的业务提供更好的服务，极大地提高了用户体验。
从网络架构来说，LIPA用于HeNB，而SIPTO可用于HeNB，也可用于宏网络。从功能和结构方面来看，LIPA和SIPTO@LN(SIPTO over the Local Network)的问题是相似的，网络架构也基本相同。在LIPA和SIPTO@LN连接技术中，LGW(Local Gateway，本地网关)取代了分组数据网络网关(Packet Data Network Gateway，简称为P-GW)，LGW与HeNB集成在一起，实现用户的业务流数据直接从基站进行接入，不经过核心网的P-GW。
现有LIPA/SIPTO技术中，如果HeNB动态增加LIPA/SIPTO能力，需要等到原先已经创建的普通分组数据网(Packet Data Network，简称为PDN)连接释放后，才能发起LIPA/SIPTO连接，这样，原先已经创建的普通PDN连接无法实时更新为LIPA/SIPTO连接，而LTE(Long Term Evolution，长期演进)网络的持续在线特性，使得已经建立的承载无法充分利用LIPA带来的分流资源。
发明内容
本发明实施例提供了一种LIPA/SIPTO连接的建立方法和装置，以至少解决无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
根据本发明实施例的一个方面，提供了一种LIPA/SIPTO连接的建立方法，包括：
在基站支持LIPA/SIPTO功能时，移动管理实体(Mobile Management Entity，简称MME)按照预设策略获取所述终端在所述基站上的公用数据网PDN连接；
获取所述终端的签约信息，其中，所述签约信息用于表示所述终端是否支持所述LIPA/SIPTO功能；
在根据所述签约信息确定所述终端支持所述LIPA/SIPTO功能时，释放所述终端对应的PDN连接；
在释放所述PDN连接后，若所述终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
在本发明实施例中，在按照预设策略获取所述终端在所述基站上的PDN连接前，还包括：接收基站发送的指示信息，其中，所述指示信息用于指示所述基站支持LIPA/SIPTO功能；按照预设策略获取所述终端在所述基站上的PDN连接包括：在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能时，触发获取所述终端在所述基站的PDN连接；或者，
按照预设策略获取所述终端在所述基站上的PDN连接包括：接收携带基站标识的控制指令，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能时，根据所述控制指令获取所述终端在所述基站标识对应的基站上的PDN连接。
在本发明实施例中，MME接收基站发送的指示信息包括：
接收所述基站发送的初始终端消息，其中，所述初始终端消息携带有所述指示信息；或者，
接收所述基站发送的上行非接入层NAS直传消息，其中，所述上行NAS直传消息携带有所述指示信息。
在本发明实施例中，在释放所述终端对应的PDN连接前，还包括：
获取本地配置的LIPA/SIPTO连接优先信息；或者，根据所述终端的签约信息得到所述LIPA/SIPTO连接优先信息；
释放所述终端对应的PDN连接包括：根据所述LIPA/SIPTO连接优先信息触发释放所述终端对应的PDN连接。
在本发明实施例中，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能后，还包括：
获取所述基站上除所述终端外的其余终端的PDN连接；
获取所述其余终端的签约信息，其中，所述签约信息用于表示所述其余终端是否支持所述LIPA/SIPTO功能；
在根据所述签约信息确定所述其余终端支持所述LIPA/SIPTO功能时，释放所述其余终端对应的PDN连接；
在释放所述其余终端对应的PDN连接后，若所述其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
根据本发明实施例的另一方面，还提供了一种本地IP接入LIPA/选择IP流量卸载SIPTO连接的建立装置，应用于MME，所述装置包括：
获取模块，设置为在基站支持LIPA/SIPTO功能时，按照预设策略获取所述终端在所述基站上的公用数据网PDN连接，并获取所述终端的签约信息，其中，所述签约信息用于表示所述终端是否支持所述LIPA/SIPTO功能；
处理模块，设置为在根据所述获取模块获取的签约信息确定所述终端支持所述LIPA/SIPTO功能时，释放所述终端对应的PDN连接；
连接模块，设置为在所述处理模块释放所述PDN连接后，若终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
在本发明实施例中，还包括：接收模块，设置为接收基站发送的指示信息，以及接收携带基站标识的控制指令，其中，所述指示信息用于指示所述基站支持LIPA/SIPTO功能；
所述获取模块，设置为在根据所述接收模块接收的指示信息确定所述基站支持所述LIPA/SIPTO功能时，触发获取所述终端在所述基站的PDN连接；以及根据所述接收模块接收的控制指令获取所述终端在所述基站标识对应的基站上的PDN连接。
在本发明实施例中，所述接收模块还设置为，接收所述基站发送的初始终端消息，其中，所述初始终端消息携带有所述指示信息；以及接收所述基站发送的上行非接入层NAS直传消息，其中，所述上行NAS直传消息携带有所述指示信息。
在本发明实施例中，所述获取模块还设置为，在所述处理模块释放所述终端对应的PDN连接前，获取本地配置的LIPA/SIPTO连接优先信息；以及根据所述终端的签约信息得到所述LIPA/SIPTO连接优先信息；
所述处理模块设置为，根据所述LIPA/SIPTO连接优先信息触发释放所述终端对应的PDN连接。
在本发明实施例中，所述获取模块还设置为，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能后，获取所述基站上除所述终端外的其余终端的PDN连接，并获取所述其余终端的签约信息，其中，所述签约信息用于表示所述其余终端是否支持所述LIPA/SIPTO功能；
所述处理模块还设置为，在根据所述获取模块获取的签约信息确定所述其余终端支持所述LIPA/SIPTO功能时，释放所述其余终端对应的PDN连接；
所述连接模块还设置为，在所述处理模块释放所述其余终端对应的PDN连接后，若所述其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
本发明实施例中，基站在增加LIPA/SIPTO功能后，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，这样，基站在增加LIPA/SIPTO功能后，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是根据现有技术的一种LIPA/SIPTO组网示意图；
图2是根据本发明实施例的一种LIPA/SIPTO连接的建立方法的示意图；
图3是根据本发明实施例的一种建立PDN连接流程的信令交互的示意图；
图4是根据本发明实施例的一种承载去激活流程的信令交互的示意图；
图5是根据本发明实施例的一种去附着流程的信令交互的示意图；
图6是根据本发明实施例的一种建立LIPA/SIPTO连接流程的信令交互的示意图；
图7是根据本发明实施例的另一种LIPA/SIPTO连接的建立方法的示意图；
图8是根据本发明实施例的另一种LIPA/SIPTO连接的建立方法的示意图；
图9是根据本发明实施例的另一种LIPA/SIPTO连接的建立方法的示意图；
图10是根据本发明实施例的一种LIPA/SIPTO连接的建立装置的结构示意图；
图11是根据本发明实施例的另一种LIPA/SIPTO连接的建立装置的结构示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明以下各实施例可以应用于一种LIPA(Local IP Access，本地IP接入)/SIPTO(Selected IP Traffic Offload,选择IP流量卸载)组网中，如图1所示，该组网包括：终端、基站、MME、SGW(Serving Gateway，服务网关)和HSS(Home Subscriber Server，归属用户签约服务器)以及LGW(Local Gateway，本地网关)，其中，该终端与基站相连，该基站可以是家庭基站，该LGW部署在该基站上，该基站与该MME连接，该SGW与该LGW连接，该MME分别与该SGW和HSS连接。
在本实施例中提供了一种方法，图2是根据本发明实施例的一种LIPA/SIPTO连接的建立方法的流程图，如图2所示，该流程包括如下步骤：
S202，在基站支持LIPA/SIPTO功能时，MME按照预设策略获取该终端在该基站上的PDN(Public Data Network，公用数据网)连接；
S204，获取该终端的签约信息；
其中，该签约信息用于表示该终端是否支持该LIPA/SIPTO功能；
S206，在根据该签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接；
S208，在释放该PDN连接后，若该终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
通过上述步骤，基站在增加LIPA/SIPTO功能后，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
在本发明实施例中，在按照预设策略获取该终端在该基站上的PDN连接前，接收基站发送的指示信息，其中，该指示信息用于指示该基站支持LIPA/SIPTO功能，并在根据该指示信息确定该基站支持该LIPA/SIPTO功能时，触发获取该终端在该基站的PDN连接；或者，
接收携带基站标识的控制指令，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能时，根据所述控制指令获取所述终端在所述基站标识对应的基站上的PDN连接。
其中，MME在根据指示信息确定基站支持该LIPA/SIPTO功能时，可以通过两种实现方式获取基站上的PDN连接，这两种方式包括：
方式一：MME在根据指示信息确定该基站支持该LIPA/SIPTO功能时，触发获取该终端在该基站的PDN连接。
方式二：MME接收携带基站标识的控制指令，在根据该指示信息确定该基站支持该LIPA/SIPTO功能时，根据该控制指令获取该终端在该基站标识对应的基站上的PDN连接。
需要说明的是，方式一与方式二的区别在于，方式一中MME在确定该基站支持该LIPA/SIPTO功能时，即可获取该终端在该基站的PDN连接，而方式二则是MME需要在接收到控制指令(如网管手工控制)后，才会获取该终端在该基站标识对应的基站上的PDN连接。
其中，如图3所示，上述PDN连接的信令流程包括：
S301，终端向基站发送连接请求消息。
S302，基站将该连接请求消息发送至MME。
S303，MME在接收到该连接请求消息后，向SGW发送创建会话请求。
S304，SGW将该创建会话请求发送至PGW。
S305，该PGW在接收到该创建会话请求后，向SGW发送创建会话响应。
S306，SGW将该创建会话响应发送至MME。
S307，MME在接收到该创建会话响应后，向基站发送初始上下文建立请求。
S308，基站在接收到该初始上下文建立请求，向终端发送创建承载消息。
S309，终端根据该创建承载请求通过基站创建PDN连接。
在本发明实施例中，接收该基站发送的初始终端消息，其中，该初始终端消息携带有该指示信息；或者，
接收该基站发送的上行NAS(Non-access Stratum,非接入层)直传消息，其中，该上行NAS直传消息携带有该指示信息。
其中，在基站发送的初始终端消息或者上行NAS消息携带有LGW地址时，则MME在接收到上述初始终端消息或者上行NAS消息，则确定该基站支持LIPA/SIPTO功能。
在本发明实施例中，MME可以通过承载去激活流程或者去附着流程完成PDN连接的释放。
需要说明的是，当MME确定去激活的承载不是该终端的最后一个承载时，则发起承载去激活流程，当MME确定去激活的承载是最后一个承载时，则发起去附着流程，从而释放该终端对应的PDN连接，如图4所示，该承载去激活的信令流程包括：
S401，MME向SGW发送删除承载命令。
S402，SGW将该删除承载命令发送至PGW。
S403，PGW在接收到该删除承载命令后，向SGW发送删除承载请求。
S404，SGW将该删除承载请求发送至MME。
S405，MME在接收到该删除承载请求后，向基站发送承载去激活请求。
S406，基站将该承载去激活请求发送至终端。
其中，该承载去激活请求中的原因值为重新创建，终端在确定该原因值为重新创建时，则在释放当前PDN连接后，重新发起PDN连接请求。
S407，终端在接收到该承载去激活请求后，向基站发送承载去激活响应。
S408，基站将该承载去激活响应发送至MME。
S409，MME在接收到该承载去激活响应后，向SGW发送删除承载响应。
S410，SGW将该删除承载响应发送至PGW。
这样，通过上述步骤S401至S410完成承载去激活流程，从而释放该终端对应的PDN连接。
如图5所示，该去附着的信令流程包括：
S501，MME向SGW发送删除承载命令。
S502，SGW将该删除承载命令发送至PGW。
S503，PGW在接收到该删除承载命令后，向SGW发送删除承载请求。
S504，SGW将该删除承载请求发送至MME。
S505，MME在接收到该删除承载请求后，向基站发送去附着请求。
S506，基站将该去附着请求发送至终端。
其中，该去附着请求中的原因值为重新创建，终端在确定该原因值为重新创建时，则在释放当前PDN连接后，重新发起PDN连接请求。
S507，终端在接收到该去附着请求后，向基站发送去附着响应。
S508，基站将该去附着响应发送至MME。
S509，MME在接收到该去附着响应后，向SGW发送删除承载响应。
S510，SGW将该删除承载响应发送至PGW。
这样，通过上述步骤S501至S510完成去附着流程，从而释放该终端对应的PDN连接。
在本发明实施例中，获取本地配置的LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接；或者，根据该终端的签约信息得到该LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
需要说明的是，该LIPA/SIPTO连接优先信息可以配置在MME中，也可以配置在终端的签约信息中，当该LIPA/SIPTO连接优先信息配置在MME中时，该MME可以在本地配置中获取该LIPA/SIPTO连接优先信息，当该LIPA/SIPTO连接优先信息配置在终端的签约信息中时，MME可以从HSS中获取该终端的签约信息，并从该签约信息中获取该LIPA/SIPTO连接优先信息。
其中，如图6所示，该LIPA/SIPTO连接的建立流程包括：
S601，终端向基站发送连接请求消息。
S602，基站将该连接请求消息发送至MME。
S603，MME在接收到该连接请求消息后，向SGW发送创建会话请求。
S604，SGW将该创建会话请求发送至LGW。
S605，该LGW在接收到该创建会话请求后，向SGW发送创建会话响应。
S606，SGW将该创建会话响应发送至MME。
S607，MME在接收到该创建会话响应后，向基站发送初始上下文建立请求。
S608，基站在接收到该初始上下文建立请求，向终端发送创建承载消息。
S609，终端根据该创建承载请求通过基站创建LIPA/SIPTO连接。
在本发明实施例中，在根据该指示信息确定该基站支持该LIPA/SIPTO功能后，获取该基站上除该终端外的其余终端的PDN连接，获取该其余终端的签约信息，其中，该签约信息用于表示该其余终端是否支持该LIPA/SIPTO功能，在根据该签约信息确定该其余终端支持该LIPA/SIPTO功能时，释放该其余终端对应的PDN连接，并在释放该其余终端对应的PDN连接后，若该其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。这样，当基站新增LIPA/SIPTO功能时，也可以决策是否需要对基站上的其余终端的PDN连接进行释放并建立LIPA/SIPTO连接，从而实时将该基站上的所有终端的普通PDN连接更新为LIPA/SIPTO连接。
图7是根据本发明另一实施例的一种LIPA/SIPTO连接的建立方法的流程图，如图7所示，该实施例的应用场景为终端从不支持LIPA/SIPTO功能的基站下移动到支持LIPA/SIPTO功能的基站下，其中，在本实施例中，不支持LIPA/SIPTO功能的基站记为第一基站，支持LIPA/SIPTO功能的基站记为第二基站，该流程包括如下步骤：
S701，终端通过第一基站与PGW创建PDN连接。
其中，PDN创建过程可以参考上述图3所示的流程，此处不再赘述。
S702，终端从第一基站下移动到第二基站下，并将该PDN连接迁移到第二基站。
S703，终端向第二基站发送位置更新消息。
S704，第二基站在接收到位置更新消息后，将携带LGW地址的初始终端消息发送至MME。
其中，第二基站向MME发送携带LGW地址的初始终端消息则表示该第二基站支持LIPA/SIPTO功能。
S705，MME在根据携带LGW地址的初始终端消息确定该第二基站支持LIPA/SIPTO功能时，获取该终端在该第二基站上的PDN连接。
S706，MME从HSS中获取该PDN连接所对应终端的签约信息。
其中，该签约信息表示该终端支持该LIPA/SIPTO功能。
在本发明实施例中，MME获取本地配置的LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接；或者，根据该终端的签约信息得到该LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
需要说明的是，该LIPA/SIPTO连接优先信息可以配置在MME中，也可以配置在终端的签约信息中，当该LIPA/SIPTO连接优先信息配置在MME中时，该MME可以在本地配置中获取该LIPA/SIPTO连接优先信息，当该LIPA/SIPTO连接优先信息配置在终端的签约信息中时，MME可以从HSS中获取该终端的签约信息，并从该签约信息中获取该LIPA/SIPTO连接优先信息。
S707，MME在根据该签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接。
其中，若MME获得该LIPA/SIPTO连接优先信息，则MME根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
在本发明实施例中，MME发起承载去激活流程或者发起去附着流程释放该终端对应的PDN连接。
需要说明的是，当MME确定去激活的承载不是该终端的最后一个承载时，则发起承载去激活流程，当MME确定去激活的承载是最后一个承载时，则发起去附着流程，从而释放该终端对应的PDN连接，其中，该承载去激活流程可以参考图4所示的流程，该去附着流程可以参考图5所示的流程，此处不再赘述。
S708，在释放该PDN连接后，若终端重新发起PDN连接建立请求，MME根据LGW地址与LGW建立LIPA/SIPTO连接。
其中，LIPA/SIPTO连接的建立流程可以参考图6所示的实施例，此处不再赘述。
需要说明的是，终端在确定释放该PDN连接过程中接收的承载去激活请求或者去附着请求中的原因值为重新创建后，则重新发起PDN连接请求。
通过上述步骤，在终端从第一基站下移动到第二基站下后，MME能够根据第二基站发送的携带LGW地址的初始终端消息确定该第二基站支持LIPA/SIPTO功能，这样，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
图8是根据本发明另一实施例的一种LIPA/SIPTO连接的建立方法的流程图，如图8所示，该流程包括如下步骤：
S801，终端通过基站与PGW创建PDN连接。
其中，PDN创建过程可以参考上述图3所示的流程，此处不再赘述。
S802，基站向MME发送携带有LGW地址的初始终端消息或者携带有该LGW地址的上行NAS直传消息发送至MME。
其中，基站向MME发送携带LGW地址的初始终端消息或者上行NAS直传消息则表示该基站当前支持LIPA/SIPTO功能。
S803，MME在根据携带LGW地址的初始终端消息或者上行NAS直传消息确定该基站支持LIPA/SIPTO功能时，获取该终端在该基站上的PDN连接。
S804，MME从HSS中获取该PDN连接所对应终端的签约信息。
其中，该签约信息表示该终端支持该LIPA/SIPTO功能。
在本发明实施例中，MME获取本地配置的LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接；或者，根据该终端的签约信息得到该LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
需要说明的是，该LIPA/SIPTO连接优先信息可以配置在MME中，也可以配置在终端的签约信息中，当该LIPA/SIPTO连接优先信息配置在MME中时，该MME可以在本地配置中获取该LIPA/SIPTO连接优先信息，当该LIPA/SIPTO连接优先信息配置在终端的签约信息中时，MME可以从HSS中获取该终端的签约信息，并从该签约信息中获取该LIPA/SIPTO连接优先信息。
S805，MME在根据该签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接。
其中，若MME获得该LIPA/SIPTO连接优先信息，则MME根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
在本发明实施例中，MME发起承载去激活流程或者发起去附着流程。
需要说明的是，当MME确定去激活的承载不是该终端的最后一个承载时，则发起承载去激活流程，当MME确定去激活的承载是最后一个承载时，则发起去附着流程，从而释放该终端对应的PDN连接，其中，该承载去激活流程可以参考图4所示的流程，该去附着流程可以参考图5所示的流程，此处不再赘述。
S806，在释放该PDN连接后，若终端重新发起PDN连接建立请求，MME根据LGW地址与LGW建立LIPA/SIPTO连接。
其中，LIPA/SIPTO连接的建立流程可以参考图6所示的实施例，此处不再赘述。
需要说明的是，终端在确定释放该PDN连接过程中接收的承载去激活请求或者去附着请求中的原因值为重新创建后，则重新发起PDN连接请求。
在本发明实施例中，在根据确定该基站支持该LIPA/SIPTO功能后，获取该基站上除该终端外的其余终端的PDN连接，并获取该其余终端的签约信息，其中，该签约信息用于表示该其余终端是否支持该LIPA/SIPTO功能，在根据该签约信息确定该其余终端支持该LIPA/SIPTO功能时，释放该其余终端对应的PDN连接，并在释放该其 余终端对应的PDN连接后，若该其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。这样，当基站新增LIPA/SIPTO功能时，也可以决策是否需要对基站上的其余终端的PDN连接进行释放并建立LIPA/SIPTO连接，从而实时将该基站上的所有终端的普通PDN连接更新为LIPA/SIPTO连接。
通过上述步骤，MME能够根据基站发送的携带LGW地址的初始终端消息或者上行NAS直传消息确定该基站支持LIPA/SIPTO功能，这样，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。图9是根据本发明另一实施例的一种LIPA/SIPTO连接的建立方法的流程图，如图9所示，在本发明实施例中，网管获知当前基站支持LIPA/SIPTO，该流程包括如下步骤：
S901，终端通过基站与PGW创建PDN连接。
其中，PDN创建过程可以参考上述图3所示的流程，此处不再赘述。
S902，MME获取携带基站标识的控制指令。
其中，该控制指令可以通过网管手工控制，例如，网管可以开启设置在MME上的开关，从而使得MME获取该控制指令。
S903，MME根据该控制指令获取该终端在该基站标识对应的基站上的PDN连接。
S904，MME从HSS中获取该PDN连接所对应终端的签约信息。
其中，该签约信息表示该终端支持该LIPA/SIPTO功能。
在本发明实施例中，MME获取本地配置的LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接；或者，根据该终端的签约信息得到该LIPA/SIPTO连接优先信息，并根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
需要说明的是，该LIPA/SIPTO连接优先信息可以配置在MME中，也可以配置在终端的签约信息中，当该LIPA/SIPTO连接优先信息配置在MME中时，该MME可以在本地配置中获取该LIPA/SIPTO连接优先信息，当该LIPA/SIPTO连接优先信息配置在终端的签约信息中时，MME可以从HSS中获取该终端的签约信息，并从该签约信息中获取该LIPA/SIPTO连接优先信息。
S905，MME在根据该签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接。
其中，若MME获得该LIPA/SIPTO连接优先信息，则MME根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
在本发明实施例中，MME发起承载去激活流程或者发起去附着流程。
需要说明的是，当MME确定去激活的承载不是该终端的最后一个承载时，则发起承载去激活流程，当MME确定去激活的承载是最后一个承载时，则发起去附着流程，从而释放该终端对应的PDN连接，其中，该承载去激活流程可以参考图4所示的流程，该去附着流程可以参考图5所示的流程，此处不再赘述。
S906，在释放该PDN连接后，若终端重新发起PDN连接建立请求，MME根据LGW地址与LGW建立LIPA/SIPTO连接。
其中，LIPA/SIPTO连接的建立流程可以参考图6所示的实施例，此处不再赘述。
需要说明的是，终端在确定释放该PDN连接过程中接收的承载去激活请求或者去附着请求中的原因值为重新创建后，则重新发起PDN连接请求。
在本发明实施例中，在根据确定该基站支持该LIPA/SIPTO功能后，获取该基站上除该终端外的其余终端的PDN连接，并获取该其余终端的签约信息，其中，该签约信息用于表示该其余终端是否支持该LIPA/SIPTO功能，在根据该签约信息确定该其余终端支持该LIPA/SIPTO功能时，释放该其余终端对应的PDN连接，并在释放该其余终端对应的PDN连接后，若该其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。这样，当基站新增LIPA/SIPTO功能时，也可以决策是否需要对基站上的其余终端的PDN连接进行释放并建立LIPA/SIPTO连接，从而实时将该基站上的所有终端的普通PDN连接更新为LIPA/SIPTO连接。
通过上述步骤，MME在接收到控制指令后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
在本实施例中还提供了一种LIPA/SIPTO连接的建立装置，该装置用于实现上述实施例及优选实施方式，已经进行过说明的不再赘述。如以下所使用的，术语“模块”可以实现预定功能的软件和/或硬件的组合。尽管以下实施例所描述的装置较佳地以软件来实现，但是硬件，或者软件和硬件的组合的实现也是可能并被构想的。
图10是根据本发明实施例的一种LIPA/SIPTO连接的建立装置100的结构框图，该装置应用于MME，如图10所示，该装置100包括：
获取模块101，设置为在基站支持LIPA/SIPTO功能时，按照预设策略获取该终端在该基站上的公用数据网PDN连接，并获取该终端的签约信息，其中，该签约信息用于表示该终端是否支持该LIPA/SIPTO功能；
处理模块102，设置为在根据该获取模块101获取的签约信息确定该终端支持该LIPA/SIPTO功能时，释放该终端对应的PDN连接；
连接模块103，设置为在该处理模块102释放该PDN连接后，若终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
在本发明实施例中，如图11所示，该装置100还包括：
接收模块104，设置为接收基站发送的指示信息，以及接收携带基站标识的控制指令，其中，所述指示信息用于指示所述基站支持LIPA/SIPTO功能；
该获取模块101，设置为在根据该接收模块104接收的指示信息确定该基站支持该LIPA/SIPTO功能时，触发获取该终端在该基站的PDN连接；以及根据该接收模块104接收的控制指令获取该终端在该基站标识对应的基站上的PDN连接。这样，MME能够通过不同的方式获取终端在该基站的PDN连接，从而灵活的建立LIPA/SIPTO连接。在本发明实施例中，该接收模块104，设置为接收该基站发送的初始终端消息，其中，该初始终端消息携带有该指示信息；以及接收该基站发送的上行非接入层NAS直传消息，其中，该上行NAS直传消息携带有该指示信息。
在本发明实施例中，该获取模块101还设置为，在该处理模块102释放该终端对应的PDN连接前，获取本地配置的LIPA/SIPTO连接优先信息；以及根据该终端的签约信息得到该LIPA/SIPTO连接优先信息；
该处理模块102设置为，根据该LIPA/SIPTO连接优先信息触发释放该终端对应的PDN连接。
需要说明的是，该LIPA/SIPTO连接优先信息可以配置在MME中，也可以配置在终端的签约信息中，当该LIPA/SIPTO连接优先信息配置在MME中时，该MME可以在本地配置中获取该LIPA/SIPTO连接优先信息，当该LIPA/SIPTO连接优先信息配置在终端的签约信息中时，MME可以从HSS中获取该终端的签约信息，并从该签约信息中获取该LIPA/SIPTO连接优先信息。
在本发明实施例中，该获取模块101还设置为，在根据该指示信息确定该基站支持该LIPA/SIPTO功能后，获取该基站上除该终端外的其余终端的PDN连接，并获取该其余终端的签约信息，其中，该签约信息用于表示该其余终端是否支持该LIPA/SIPTO功能；
该处理模块102还设置为，在根据该获取模块101获取的签约信息确定该其余终端支持该LIPA/SIPTO功能时，释放该其余终端对应的PDN连接；
该连接模块103还设置为，在该处理模块102释放该其余终端对应的PDN连接后，若该其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
这样，当基站新增LIPA/SIPTO功能时，也可以决策是否需要对基站上的其余终端的PDN连接进行释放并建立LIPA/SIPTO连接，从而实时将该基站上的所有终端的普通PDN连接更新为LIPA/SIPTO连接。
通过采用上述装置，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
综上所述，本发明实施例中主要适用于终端已经创建普通PDN连接后，终端从不支持LIPA/SIPTO的基站下移动到支持LIPA/SIPTO功能的基站下，或者基站新布署了LIPA/SIPTO功能的场景。主要步骤包括如下：
步骤1：已经创建了普通PDN连接，终端从不支持LIPA/SIPTO的基站下移动到支持LIPA/SIPTO功能的基站下，或者基站新布署了LIPA/SIPTO功能。
步骤2：MME根据基站的LIPA/SIPTO能力，以及终端签约信息是否支持LIPA/SIPTO，以及本局是否配置LIPA/SIPTO优先，决定是否释放普通PDN连接。
可选的，终端签约信息中也可以增加LIPA/SIPTO优先签约项，MME根据终端是否签约LIPA/SIPTO优先，决定是否释放普通PDN连接，触发终端重新发起创建，从而建立LIPA/SIPTO连接。
可选的，MME可以根据基站标识，通过网管手工对普通PDN连接发起释放。
步骤3：用户发起新的PDN连接请求，建立LIPA/SIPTO连接。
本发明实施例可以针对当前终端判断是否需要建立LIPA/SIPTO连接，也可以针对基站下所有的承载连接重新判断是否需要建立LIPA/SIPTO连接。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。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。
工业实用性
本发明实施例中，基站在增加LIPA/SIPTO功能后，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，这样，基站在增加LIPA/SIPTO功能后，能够实时释放当前的普通PDN连接，并在终端重新发起PDN连接请求后，完成LIPA/SIPTO连接的建立，从而解决了无法实时将普通PDN连接更新为LIPA/SIPTO连接的技术问题

Claims (10)

  1. 一种本地IP接入LIPA/选择IP流量卸载SIPTO连接的建立方法，包括：
    在基站支持LIPA/SIPTO功能时，移动管理实体MME按照预设策略获取终端在所述基站上的公用数据网PDN连接；
    获取所述终端的签约信息，其中，所述签约信息用于表示所述终端是否支持所述LIPA/SIPTO功能；
    在根据所述签约信息确定所述终端支持所述LIPA/SIPTO功能时，释放所述终端对应的PDN连接；
    在释放所述PDN连接后，若所述终端重新发起PDN连接请求，与本地网关LGW建立LIPA/SIPTO连接。
  2. 根据权利要求1所述的方法，其中，在按照预设策略获取所述终端在所述基站上的PDN连接前，还包括：接收基站发送的指示信息，其中，所述指示信息用于指示所述基站支持LIPA/SIPTO功能；按照预设策略获取所述终端在所述基站上的PDN连接包括：在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能时，触发获取所述终端在所述基站的PDN连接；或者，
    按照预设策略获取所述终端在所述基站上的PDN连接包括：接收携带基站标识的控制指令，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能时，根据所述控制指令获取所述终端在所述基站标识对应的基站上的PDN连接。
  3. 根据权利要求2所述的方法，其中，MME接收基站发送的指示信息包括：
    接收所述基站发送的初始终端消息，其中，所述初始终端消息携带有所述指示信息；或者，
    接收所述基站发送的上行非接入层NAS直传消息，其中，所述上行NAS直传消息携带有所述指示信息。
  4. 根据权利要求2或3所述的方法，其中，在释放所述终端对应的PDN连接前，还包括：
    获取本地配置的LIPA/SIPTO连接优先信息；或者，根据所述终端的签约信息得到所述LIPA/SIPTO连接优先信息；
    释放所述终端对应的PDN连接包括：根据所述LIPA/SIPTO连接优先信息触发释放所述终端对应的PDN连接。
  5. 根据权利要求4所述的方法，其中，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能后，还包括：
    获取所述基站上除所述终端外的其余终端的PDN连接；
    获取所述其余终端的签约信息，其中，所述签约信息用于表示所述其余终端是否支持所述LIPA/SIPTO功能；
    在根据所述签约信息确定所述其余终端支持所述LIPA/SIPTO功能时，释放所述其余终端对应的PDN连接；
    在释放所述其余终端对应的PDN连接后，若所述其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
  6. 一种本地IP接入LIPA/选择IP流量卸载SIPTO连接的建立装置，应用于移动管理实体MME，所述装置包括：
    获取模块，设置为在基站支持LIPA/SIPTO功能时，按照预设策略获取终端在所述基站上的公用数据网PDN连接，并获取所述终端的签约信息，其中，所述签约信息用于表示所述终端是否支持所述LIPA/SIPTO功能；
    处理模块，设置为在根据所述获取模块获取的签约信息确定所述终端支持所述LIPA/SIPTO功能时，释放所述终端对应的PDN连接；
    连接模块，设置为在所述处理模块释放所述PDN连接后，若终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
  7. 根据权利要求6所述的装置，其中，还包括：接收模块，设置为接收基站发送的指示信息，以及接收携带基站标识的控制指令，其中，所述指示信息用于指示所述基站支持LIPA/SIPTO功能；
    所述获取模块，设置为在根据所述接收模块接收的指示信息确定所述基站支持所述LIPA/SIPTO功能时，触发获取所述终端在所述基站的PDN连接；以及根据所述接收模块接收的控制指令获取所述终端在所述基站标识对应的基站上的PDN连接。
  8. 根据权利要求7所述的装置，其中，所述接收模块还设置为，接收所述基站发送的初始终端消息，其中，所述初始终端消息携带有所述指示信息；以及接收 所述基站发送的上行非接入层NAS直传消息，其中，所述上行NAS直传消息携带有所述指示信息。
  9. 根据权利要求7或8所述的装置，其中，
    所述获取模块还设置为，在所述处理模块释放所述终端对应的PDN连接前，获取本地配置的LIPA/SIPTO连接优先信息；以及根据所述终端的签约信息得到所述LIPA/SIPTO连接优先信息；
    所述处理模块设置为，根据所述LIPA/SIPTO连接优先信息触发释放所述终端对应的PDN连接。
  10. 根据权利要求9所述的装置，其中，
    所述获取模块还设置为，在根据所述指示信息确定所述基站支持所述LIPA/SIPTO功能后，获取所述基站上除所述终端外的其余终端的PDN连接，并获取所述其余终端的签约信息，其中，所述签约信息用于表示所述其余终端是否支持所述LIPA/SIPTO功能；
    所述处理模块还设置为，在根据所述获取模块获取的签约信息确定所述其余终端支持所述LIPA/SIPTO功能时，释放所述其余终端对应的PDN连接；
    所述连接模块还设置为，在所述处理模块释放所述其余终端对应的PDN连接后，若所述其余终端重新发起PDN连接请求，与LGW建立LIPA/SIPTO连接。
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