WO2013071816A1 - 非3gpp网接入3gpp核心网的系统、方法和设备 - Google Patents
非3gpp网接入3gpp核心网的系统、方法和设备 Download PDFInfo
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- WO2013071816A1 WO2013071816A1 PCT/CN2012/083720 CN2012083720W WO2013071816A1 WO 2013071816 A1 WO2013071816 A1 WO 2013071816A1 CN 2012083720 W CN2012083720 W CN 2012083720W WO 2013071816 A1 WO2013071816 A1 WO 2013071816A1
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- 3gpp
- terminal
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- core network
- pdn connection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/12—Setup of transport tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
Definitions
- the present invention relates to the field of mobile communication technologies, and in particular, to a system, method and device for accessing a 3GPP core network without a 3GPP network. Background technique
- WIFI wireless fidelity
- WLAN Wireless Area
- the 3GPP (The 3rd Generation Partnership Project) access network (such as 802.11 wireless network, broadband access network, etc.) is deployed by the operator, it can be regarded as a trusted network access to the operation.
- Business core network There is currently no standard to regulate how to implement terminal access to the 3GPP core network through a trusted non-3GPP network, thereby implementing handover and flow mobility.
- the main solutions for the current transformation of the non-3GPP access network include: 1. Enhance the layer-3 signaling on the radio interface. This scheme needs to enhance IEEE 802.11; Design a media-independent solution on top of the Internet Protocol (IP) protocol.
- IP Internet Protocol
- the embodiments of the present invention provide a system, method and device for a terminal to access a 3GPP core network through a non-3GPP network, and support the terminal to access the 3GPP core network through a non-3GPP network without modifying the bottom layer of the terminal and the access network. , reducing the complexity of the terminal accessing the 3GPP core network through the non-3GPP network.
- An embodiment of the present invention provides a system for a terminal to access a 3GPP core network through a non-3GPP network, including a 3GPP core network device, an access gateway, and a terminal, where:
- the terminal after establishing a connection with the non-3GPP network, sends a tunnel establishment request to the access gateway, requesting to establish a tunnel with the access gateway, where the tunnel establishment request carries a public data network PDN a connection type; and receiving a network address sent by the access gateway;
- the access gateway is configured to: after receiving the tunnel establishment request, send a PDN connection establishment request to the 3GPP core network device, requesting to establish a PDN connection with the 3GPP core network device, where the PDN connection establishment request is The PDN connection type is carried in the network; after the PDN connection is successfully established, the network address assigned by the 3GPP core network device to the terminal is received, and the network address is sent to the terminal;
- the 3GPP core network device is configured to allocate a network address to the terminal according to the PDN connection type in the PDN connection establishment request, and send the network address allocated to the terminal to the access gateway.
- An embodiment of the present invention provides a method for a terminal to access a 3GPP core network through a non-3GPP network, including:
- the access gateway receives a tunnel establishment request sent by the terminal, where the tunnel establishment request carries a PDN connection type of the public data network;
- the access gateway sends a PDN connection establishment request to the 3GPP core network device, requesting to establish a PDN connection with the 3GPP core network, where the PDN connection establishment request carries the PDN connection type; Receiving, after the PDN connection is successfully established, the network address allocated by the 3GPP core network device according to the PDN connection type to the terminal;
- the access gateway sends the network address to the terminal.
- An embodiment of the present invention provides an access gateway, including:
- a first receiving unit configured to receive a tunnel establishment request sent by the terminal, where the tunnel establishment request carries a public data network PDN connection type;
- a first sending unit configured to send a PDN connection establishment request to the 3GPP core network device, requesting to establish a PDN connection with the 3GPP core network device, where the PDN connection establishment request carries the PDN connection type;
- a second receiving unit configured to receive, after the PDN connection is successfully established, the network address that is allocated by the 3GPP core network device according to the PDN connection type;
- a second sending unit configured to send the network address to the terminal.
- An embodiment of the present invention provides a terminal, including:
- a first sending unit configured to: after establishing a connection with the non-3GPP network, send a tunnel establishment request to the access gateway, requesting to establish a tunnel with the access gateway, where the tunnel establishment request carries a public data network PDN connection Types of;
- a receiving unit configured to receive a network address sent by the access gateway, where the access gateway requests, according to the PDN connection type carried in the tunnel establishment request, a network address allocated to the terminal to the 3GPP core network device.
- the terminal sends a tunnel establishment request to the access gateway, and carries information related to the PDN connection request, and the access gateway receives the tunnel sent by the terminal.
- a PDN connection is established with the 3GPP core network device, and then a response message of the tunnel establishment request is sent to the terminal, and the network message assigned by the 3GPP core network device to the terminal is carried in the response message, and the terminal and the access gateway are The establishment of the tunnel is completed, and the PDN connection with the 3GPP core network is also established.
- FIG. 1 is a schematic diagram of a scenario in which a terminal accesses a 3GPP core network through a non-3GPP network according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart of a method for implementing a method for a terminal to access a 3GPP core network through a non-3GPP network according to an embodiment of the present invention
- 3a is a schematic diagram of a protocol stack using a PMIP tunneling protocol between an access gateway and a PGW according to an embodiment of the present invention
- 3b is a schematic diagram of a protocol stack in which a GTP tunneling protocol is used between an access gateway and a PGW according to an embodiment of the present invention
- FIG. 4 is a schematic diagram of a process for a terminal to access a 3GPP core network through a non-3GPP network according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of an implementation process for a terminal to request a handover from a 3GPP access mode to a non-3GPP access mode according to an embodiment of the present disclosure
- FIG. 6 is a schematic diagram of a terminal accessing through a 3GPP network and a non-3GPP network simultaneously in an embodiment of the present invention
- FIG. 7 is a schematic structural diagram of a system for a terminal to access a 3GPP core network through a non-3GPP network according to an embodiment of the present invention
- FIG. 8 is a schematic structural diagram of an access gateway according to an embodiment of the present invention
- FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention. detailed description
- the embodiments of the present invention provide a specific implementation method of a non-3GPP network when a terminal accesses a mobile operator 3GPP core network through a trusted non-3GPP network (such as a WLAN).
- a trusted non-3GPP network such as a WLAN
- the present invention is applicable to a scenario in which a terminal accesses a 3GPP core network through a non-3GPP network. As shown in Figure 1, the terminal accesses the non-3GPP network through the access point, and accesses the mobile operator's 3GPP core network through the access gateway for signaling interaction and data communication.
- the terminal can simultaneously access the 3GPP core network through the non-3GPP network and the 3GPP network, but the currently unresolved issues include: how the terminal initiates a connection establishment request to the public data network (PDN, Public Data Network) of the 3GPP core network and Connection release request; To support the continuity of the service, how the terminal gives a relevant indication when establishing the connection; how to implement the flow mobility operation between the non-3GPP network and the 3GPP network in the non-3GPP network.
- PDN Public Data Network
- the embodiment of the present invention establishes a tunnel between the terminal and the access gateway, and transmits signaling information related to connection establishment, handover, and flow mobility, and the like through the tunnel.
- a schematic flowchart of a method for implementing a method for a terminal to access a 3GPP core network through a non-3GPP network including:
- the access gateway receives a tunnel establishment request sent by the terminal, where the tunnel establishment request carries a PDN connection type.
- the terminal discovers a non-3GPP network and completes connection and authentication with the non-3GPP network.
- the terminal detects that there is a trusted non-3GPP network (such as WLAN), and the terminal connects to the non-3GPP access network according to the existing non-3GPP access method, and passes the corresponding authentication.
- After the terminal accesses the non-3GPP network initiate a tunnel establishment request to the access gateway, and carry the relevant information of the PDN connection request.
- the information may include an APN (Access Point Name), a PDN connection type, a data flow description information, a data flow identifier, a multiple access identifier, a handover indication, and the like.
- the PDN connection type can be IPV4, and / or IPV6, which can be IPV4, IPV6, or IPV4V6.
- the access gateway sends a PDN connection establishment request to the 3GPP core network device, and requests to establish a PDN connection with the 3GPP core network, where the PDN connection establishment request carries the PDN connection type.
- the access gateway After receiving the tunnel establishment request sent by the terminal, the access gateway performs a 3GPP related procedure with the 3GPP core network device, performs authentication and authorization on the 3GPP core network device, and establishes a PDN connection with the 3GPP core network device.
- a GTP tunnel or a PMIP tunnel between the 3GPP core network may be established through a GPRS Tunneling Protocol (GTP, GPRS Tunnel Protocol) or a Proxy Mobile IP (PMIP) protocol.
- GTP GPRS Tunneling Protocol
- PMIP Proxy Mobile IP
- the 3GPP core network device After the PDN connection is successfully established, the 3GPP core network device allocates a network address to the terminal according to the PDN connection type carried in the PDN connection establishment request.
- the 3GPP core network device allocates a network address to the terminal after establishing a GTP tunnel or a PMIP tunnel with the access gateway. Specifically, if the PDN connection type carried in the PDN connection request is IPV4, the network address assigned by the 3GPP core network device to the terminal is an IPV4 address; if the PDN connection type carried in the PDN connection request is IPV6, the 3GPP core network device The network address assigned to the terminal is the IPV6 address prefix. If the PDN connection type carried in the PDN connection request is IPV4V6, the network address assigned by the 3GPP core network device to the terminal is an IPV4 address or an IPV6 address prefix.
- S204 The access gateway sends the received network address to the terminal.
- the access gateway after receiving the network address sent by the 3GPP core network device, the access gateway sends a response message of the tunnel establishment request to the terminal, and carries the network address allocated by the 3GPP core network device for the terminal in the response message.
- the terminal when the terminal needs to detach or disconnect the PDN with the 3GPP core network device, When the connection is made, the terminal initiates a tunnel release request to the access gateway, where the tunnel release request carries the PDN connection identifier that needs to be released.
- the PDN connection identifier may be a network address allocated by the 3GPP core network device for the terminal.
- the access gateway After the connection with the 3GPP core network device is released, the access gateway returns a response message of the tunnel release request to the terminal, and releases the tunnel between the access gateway and the terminal. At this point, the PDN connection between the terminal and the 3GPP core network device is released.
- the tunneling protocol between the access gateway and the terminal may be, but not limited to, the Session Initiation Protocol (SIP).
- SIP Session Initiation Protocol
- the tunnel protocol adopted between the terminal and the access gateway is the SIP protocol in the following embodiments. The description is made by way of example, but the use of the SIP protocol is not intended to limit other implementations of the invention.
- the SIP protocol is a signaling protocol for multimedia communication over an IP network.
- the common SIP message includes: a start line, a message header, and a message body.
- the start line and the message header field and the parameter content are relatively fixed.
- the SIP message body is used.
- the Session Description Protocol (SDP) field is enhanced to implement signaling interaction between the terminal and the access gateway. That is, in the tunnel establishment request, the setting is added to the SDP field in the SIP message body.
- SDP Session Description Protocol
- the keyword may include: a keyword used to represent the session initiator identifier and the session identifier, used to represent the session name Keywords and keywords that will be used to characterize the message.
- the specific settings of the keyword settings and the assignments set for the keywords are shown in Tables 1 to 10.
- a SIP tunnel for a control plane, a protocol stack of a control plane between a terminal, an access gateway, and a core network device is established between the terminal and the access gateway.
- the schematic diagram, wherein the core network device may be a Public Data Network Gateway (PGW).
- PGW Public Data Network Gateway
- the PMIP tunneling protocol is used between the access gateway and the PGW for signaling interaction.
- the network layer adopts the IP protocol
- the transmission layer adopts the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP)
- the application layer adopts the SIP protocol.
- the network layer adopts the IPV4/IPV6 protocol
- both the transport layer and the application layer adopt the PMIPV6 protocol.
- the GTP tunneling protocol is used between the access gateway and the PGW for signaling interaction.
- the network layer adopts the Ip protocol
- the transport layer adopts the TCP/UDP protocol
- the application layer adopts the SIP protocol
- the gateway and the PGW from the bottom to the top are the physical layer and the data link layer L1/L 2
- the network layer adopts the IPV4/IPV6 protocol
- the transport layer adopts the UDP protocol
- the application layer adopts the GTP-C protocol.
- a schematic diagram of a process for a terminal to access a 3GPP core network through a non-3GPP network includes the following steps:
- the terminal detects a non-3GPP network, establishes a connection with the non-3GPP network, and passes the corresponding authentication.
- the terminal sends a SIP signaling INVITE to the access gateway, initiates a tunnel establishment request, and carries information related to the PDN connection establishment request for initial attachment;
- SDP Session Description Protocol
- Keyword keyword description keyword value in the present invention
- IPv4, IPv6, or IPv4v6 data flow description information
- data stream identifier data stream identifier
- the terminal identifier may be an International Mobile Subscriber Identity (IMSI).
- IMSI International Mobile Subscriber Identity
- the access gateway sends a SIP Trying response to the terminal, indicating that the foregoing message has been received.
- the PDN connection between the access gateway and the core network device is successfully established (that is, a GTP tunnel or a PMIP tunnel is established).
- the access gateway sends a SIP OK success response to the terminal, indicating that the SIP tunnel is successfully established, and carries the network address allocated by the core network device to the terminal.
- the session description protocol In the SIP signaling, the session description protocol
- the terminal sends a SIP acknowledgment response to the access gateway, the tunnel between the terminal and the access gateway is successfully established, and the PDN connection with the 3GPP core network device is successfully established.
- Keyword keyword describes the keyword value name in the present invention
- the present invention uses the network address assigned to the terminal by the core network
- the access gateway initiates a SIP OK confirmation to the terminal, and confirms that the tunnel is released.
- the terminal accesses the 3GPP core network through the 3GPP network before establishing the connection with the non-3GPP network, if the terminal wants to switch the existing 3GPP access network to the non-3GPP access network, and does not generate the current service of the user.
- the terminal can notify the 3GPP core network device that the 3GPP core network has accessed the 3GPP core network through the 3GPP network by carrying the handover indicator in the tunnel establishment request.
- the 3GPP core network device needs to perform the handover of the access network (the PDN connection request sent by the access gateway carries the handover indicator)
- the terminal accesses the 3GPP core network through the 3GPP network, the terminal allocates the terminal to the terminal.
- the network address is reassigned to the terminal. In this way, the continuity requirements of the business can be met.
- the premise that the terminal requests to perform the handover of the access mode is that the terminal requests to pass the non-
- a schematic diagram of an implementation process of switching to a non-3GPP access mode includes the following steps:
- the terminal detects a non-3GPP network, establishes a connection with the non-3GPP network, and passes the phase. Should be authenticated;
- the terminal sends a SIP signaling INVITE to the access gateway, initiates a tunnel establishment request, and carries information related to the PDN connection establishment request, and carries the handover indicator in the request.
- SDP Session Description Protocol
- the access gateway sends a SIP Trying response to the terminal, indicating that the foregoing message has been received.
- the PDN connection between the access gateway and the core network device is successfully established (that is, the corresponding GTP tunnel or PMIP tunnel is established);
- the access gateway sends a SIP OK success response to the terminal, indicating that the SIP tunnel is successfully established, and carries the IP address allocated by the core network device for the terminal.
- the network address allocated by the core network device to the terminal is the same as the network address previously allocated to the terminal; in the SIP signaling, the session description protocol (The value of the keywords in SDP is as shown in Table 5:
- Session number s Session name WLAN Access
- the core network is assigned to the terminal's IPv4
- the terminal sends a SIP acknowledgment response to the access gateway, and the SIP tunnel between the terminal and the access gateway is successfully established, and the PDN connection used for the handover is successfully established.
- the terminal can implement communication with the 3GPP core network through the SIP tunnel.
- the 3GPP core network and the terminal release the resources related to the PDN connection originally accessed by the 3GPP network to the 3GPP core network according to the existing signaling procedure.
- the terminal may initiate a flow mobility request to the access gateway through a tunnel with the access gateway, that is, implement part of the service flow in 3GPP. Movement between the network and the non-3GPP network. Specifically, the terminal sends a first flow mobility request to the access gateway, and requests to migrate the data flow of the 3GPP access mode to the non-3GPP access mode, or migrate the data flow of the non-3GPP access mode to the 3GPP access mode.
- the first flow mobility request carries the flow identifier of the data flow to be migrated and the access mode to be migrated corresponding to the data flow, where the access mode includes the non-3GPP access mode and the 3GPP access mode;
- the ingress gateway is further configured to: after receiving the first flow mobility request, send a second mobility request to the 3GPP core network device, where the second mobility request carries the flow identifier of the data flow to be migrated and the data The access mode to be migrated to the flow;
- the 3GPP core network device is further configured to: after receiving the second flow mobility request, if the access mode corresponding to the data flow corresponding to the flow identifier is to be migrated to the 3GPP access mode, Then, according to the existing communication process, the corresponding bearer is added or the existing bearer is modified so that the data flow can be accepted; if the data flow corresponding to the flow identifier is to be migrated to the access mode, 3GPP access In the incoming mode, the existing bearer is modified or deleted according to the
- the terminal when the terminal accesses the 3GPP core network through the 3GPP network and the non-3GPP network at the same time, the terminal can initiate a flow mobility request by using the SIP signaling, so that part of the service flow can be implemented between the 3GPP network and the non-3GPP network. The movement.
- mapping table between the access mode and the flow identification information needs to be stored in the terminal.
- the structure of the mapping table can be as shown in Table 6:
- the flow mobility operation is schematic, including the following steps:
- the terminal sends a SIP signaling UPDATE to the access gateway to initiate a flow mobility request, where the flow mobility request carries data flow information that needs to be moved.
- Keyword keyword describes the keyword value name in the present invention
- 0 Session Initiator ID and Session End Identifier (IMSI), current ID session number
- each item in the list includes the data flow description information and the corresponding access method to be migrated to.
- the access gateway sends a SIP Trying response to the terminal, indicating that the foregoing message has been received;
- the 3GPP core network device adds/deletes/modifies the bearer according to the flow mobility information.
- the 3GPP core network device modifies or deletes the bearer information corresponding to the data flow identifier according to the received data flow identifier.
- the access gateway sends a SIP OK success response to the terminal, indicating that the flow mobility request is accepted, and carrying the accepted flow mobility information;
- SDP Session Description Protocol
- Keyword keyword description Keyword value in the present invention
- Each item in the table includes data flow description information and Corresponding migration access mode ⁇
- the terminal sends a SIP acknowledgment response to the access gateway, the flow mobility request is successful, and a new routing rule is established.
- mapping information of the access mode and the flow information stored in the terminal will change.
- the terminal mapping table information in this embodiment is as shown in Table 9 before the flow mobility process: Table 9
- the data flow 1 (FlowID1) of the 3GPP access mode is migrated to the WLAN access mode.
- the terminal mapping relationship in this embodiment is as shown in Table 10:
- the PDN is connected to the WLAN access FlowID1 service data flow description and is assigned to the final mode information 1
- the embodiment of the invention provides an implementation method for supporting access to the 3GPP core network and not inside the 3GPP network.
- a tunnel on the control plane above the IP layer is established between the terminal and the access gateway to implement related communication between the terminal and the access gateway for access, handover, and flow mobility.
- the method not only realizes flexible billing, but also has strong scalability, and can reduce the impact on the underlying layer of the non-3GPP network, and has nothing to do with the specific protocol on the interface between the 3GGPP network and the 3GPP core network.
- the embodiment of the present invention further provides a system for a terminal to access a 3GPP core network through a non-3GPP network, and an access gateway and a terminal, and the principle of the system and related devices solve the problem and the terminal passes the non-3GPP.
- the method for accessing the 3GPP core network is similar.
- the implementation of the system and related devices refer to the implementation of the method for the terminal to access the 3GPP core network through the non-3GPP network.
- a schematic diagram of a system structure for a terminal to access a 3GPP core network through a non-3GPP network includes a 3GPP core network device 701, an access gateway 702, and a terminal 703, where:
- the terminal 703 is configured to send a tunnel establishment request to the access gateway after establishing a connection with the non-3GPP network, requesting to establish a tunnel with the access gateway, where the tunnel establishment request carries the public number According to the network PDN connection type; and receiving the network address sent by the access gateway 702;
- the access gateway 702 is configured to send a PDN connection establishment request to the 3GPP core network device 701 after receiving the tunnel establishment request sent by the terminal 703, requesting to establish a PDN connection with the 3GPP core network device 701, the PDN connection establishment request.
- the PDN connection type is carried in; after the PDN connection is successfully established, the network address assigned by the 3GPP core network device 701 to the terminal 703 is received, and the network address is sent to the terminal 703;
- the 3GPP core network device 701 is configured to allocate a network address to the terminal 703 according to the PDN connection type carried in the PDN connection establishment request, and send the network address allocated to the terminal 703 to the access gateway 702.
- the PDN connection type carried in the tunnel establishment request includes IPV4, and/or IPV6.
- the 3GPP core network device 701 can be used to allocate the network address assigned to the terminal 703 to the IPV4 address when the PDN connection type is IPV4.
- the network address assigned to the terminal 703 is the prefix of the IPV6 address; when the PDN connection type is IPV4 and IPV6, the network address assigned to the terminal 703 is the IPV4 address or the prefix of the IPV6 address.
- the terminal 703 may also be used to access the 3GPP core network through the 3GPP network before establishing a connection with the non-3GPP network, if the terminal wishes to switch the existing 3GPP access network to the non-3GPP access network, and the If the current service of the user has an impact, the terminal carries a handover indicator in the tunnel establishment request.
- the access gateway 702 can also be configured to carry the handover indicator in the PDN connection request.
- the 3GPP core network device 701 can be used to re-assign the network address assigned to the terminal 703 when the terminal 703 accesses the 3GPP core network through the 3GPP network. Assigned to terminal 703.
- the terminal 703 is further configured to send a first mobility request to the access gateway 702 through a tunnel with the access gateway 702 when simultaneously accessing the 3GPP core network through the 3GPP network and the non-3GPP network.
- a first mobility request to the access gateway 702 through a tunnel with the access gateway 702 when simultaneously accessing the 3GPP core network through the 3GPP network and the non-3GPP network.
- the first flow mobility carries the flow identifier of the data stream to be migrated and the access mode to be migrated corresponding to the data flow, and the access mode includes a non-3GPP access mode and a 3GPP access mode;
- the access gateway 702 is further configured to: after receiving the first mobility request, send a second mobility request to the 3GPP core network device, where the second mobility request carries a flow identifier of the data flow to be migrated The access method to which the data stream corresponds to be migrated;
- the 3GPP core network device 701 is further configured to: after receiving the second mobility request, if the access mode to which the data flow corresponding to the flow identifier is to be migrated is the 3GPP access mode, add the corresponding bearer according to the existing communication process. Or modifying the existing bearer so that the data flow can be accepted; if the access mode to which the data flow corresponding to the flow identifier is to be migrated is a non-3GPP access mode, the existing bearer is performed according to the existing communication process. Modify or delete.
- the terminal 703 and the access gateway 702 use the session initiation protocol SIP to transmit signaling through the established tunnel.
- a schematic structural diagram of an access gateway includes: a first receiving unit 801, configured to receive a tunnel establishment request sent by a terminal, where the tunnel establishment request carries a PDN connection type;
- the first sending unit 802 is configured to send a PDN connection establishment request to the 3GPP core network device, requesting to establish a PDN connection with the 3GPP core network device, where the PDN connection establishment request carries the PDN connection type;
- a second receiving unit 803 configured to receive a network address, where the network address is allocated by the 3GPP core network device according to the PDN connection type after the PDN connection is successfully established;
- the second sending unit 804 is configured to send the received network address to the terminal.
- the first receiving unit 801 may be configured to receive a tunnel establishment request sent by the terminal when the terminal accesses the 3GPP core network through the 3GPP network before establishing the connection between the terminal and the non-3GPP network, where the tunnel establishment request carries the PDN connection.
- Type and switching indicator The first sending unit 802 is further configured to: send the handover indicator to the 3GPP core network device in the PDN connection request;
- a first indication unit configured to instruct the 3GPP core network device to reassign the terminal to the network address allocated to the terminal when the terminal accesses the 3GPP core network through the 3GPP network.
- the access gateway may further include:
- a third receiving unit configured to: when the terminal accesses the 3GPP core network through the 3GPP network, the first mobile mobility request sent by the receiving terminal according to the stored access mode and the flow identifier mapping table, where the first mobility request is carried in the first mobility request
- the flow identifier of the data stream to be migrated and the access mode corresponding to the data flow, the access mode includes a non-3GPP access mode and a 3GPP access mode;
- a third sending unit configured to send, after receiving the first flow mobility request, a second flow mobility request to the 3GPP core network device, where the second flow mobility request carries a flow identifier of the data flow to be migrated and the The access method corresponding to the data stream;
- a second indication unit configured to: instruct the 3GPP core network device to migrate the data flow corresponding to the flow identifier to the non-flow according to the received second flow mobility request, if the data flow access mode corresponding to the flow identifier is the 3GPP access mode In the 3GPP access mode, if the data flow access mode corresponding to the flow identifier is a non-3GPP access mode, the data flow corresponding to the flow identifier is migrated to the 3GPP access mode.
- a schematic structural diagram of a terminal includes: a first sending unit 901, configured to send a tunnel establishment request to an access gateway after establishing a connection with a non-3GPP network, requesting establishment and connection a tunnel between the gateways, where the tunnel establishment request carries a PDN connection type;
- the receiving unit 902 is configured to receive a network address sent by the access gateway, and the access gateway requests the 3GPP core network device to allocate a network address to the terminal according to the PDN connection type carried in the tunnel establishment request.
- the first sending unit 901 is further configured to: when the terminal establishes a connection with the non-3GPP network, the terminal carries the handover indicator in the tunnel establishment request when the terminal accesses the 3GPP core network through the 3GPP network.
- the terminal provided by the embodiment of the present invention may further include:
- a storage unit configured to store an access mode and a flow identifier mapping table
- a second sending unit configured to: after establishing a tunnel with the access gateway, when the terminal accesses the 3GPP core network through the 3GPP network, sends a flow mobility request to the access gateway, requesting to migrate the data flow of the 3GPP access mode to The non-3GPP access mode, or the data flow of the non-3GPP access mode is migrated to the 3GPP access mode, where the flow mobility request carries the flow identifier of the data flow to be migrated and the access mode corresponding to the data flow,
- the access mode includes a non-3GPP access mode and a 3GPP access mode.
- embodiments of the present invention can be provided as a method, system, or computer program product.
- the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware.
- the present invention may employ computer usable storage media (including but not limited to disk storage, in one or more of the computer usable program code embodied therein.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- the terminal sends a tunnel establishment request to the access gateway, and carries information related to the PDN connection request, and the access gateway receives the tunnel sent by the terminal.
- a PDN connection is established with the 3GPP core network device, and then a response message of the tunnel establishment request is sent to the terminal, and the network message assigned by the 3GPP core network device to the terminal is carried in the response message, and the terminal and the access gateway are The establishment of the tunnel is completed, and the PDN connection with the 3GPP core network is also established.
- the terminal and the non-3GPP network underlayer need not be modified, so that the terminal accesses the 3GPP core network through the non-3GPP network, which reduces the complexity of the terminal accessing the 3GPP core network through the non-3GPP network.
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Abstract
本发明公开了一种非3GPP网接入3GPP核心网的系统、方法和设备,其中,所述方法包括:接入网关接收终端发送的隧道建立请求,所述隧道建立请求中携带有公用数据网PDN连接类型;所述接入网关向3GPP核心网设备发送PDN连接建立请求,请求与所述3GPP核心网建立PDN连接,所述PDN连接建立请求中携带有所述PDN连接类型;所述接入网关接收所述3GPP核心网设备在PDN连接建立成功之后,根据所述PDN连接类型为所述终端分配的网络地址;所述接入网关将所述网络地址发送给所述终端。
Description
非 3GPP网接入 3GPP核心网的系统、 方法和设备 技术领域
本发明涉及移动通信技术领域, 尤其涉及一种非 3GPP网接入 3GPP核心 网的系统、 方法和设备。 背景技术
随着 WIFI ( wireless fidelity )热点的大面积部署及智能终端的普及, 更多 的接入方式提供了全面、 良好的信号覆盖, 更多的终端也具备了蜂窝网和无线 局域网 (WLAN, Wireless Area Network ) 的接入能力, 用户通过多种接入方 式接入到移动运营商核心网不仅能够分担蜂窝网数据流量的压力,降低运营商 部署成本, 还可以为用户带来更为方便快捷的业务体验。
当非第三代合作伙伴项目 ( 3GPP, The 3rd Generation Partnership Project ) 接入网络(如 802.11 无线网络、 宽带接入网等) 由运营商部署时, 可以看作 是可信的网络接入到运营商核心网。当前尚没有标准来规范如何实现终端通过 可信非 3GPP网络接入到 3GPP核心网, 进而实现切换和流移动性。 为支持非 3GPP网络接入到 3GPP核心网, 当前对非 3GPP接入网内进行改造的主要方 案思路包括: 1、 在无线接口对层三信令进行增强, 这一方案需要增强 IEEE 802.11 ; 2、 在互联网协议(IP, International Protocol )层之上设计独立于媒介 的解决方案, 这一方案需工程任务组(IETF, Internet Engineering Task Force ) 设计新的协议; 3、 宽带网论坛( BBF , Broadband Forum)增强接入点到接入网 关间的信令协议, 这一方案需要终端到接入点的解决方案作为补充; 4、 建立 互联网安全性(IPSec ) 隧道, 这一方案对可信网络接入来说, 成本太高。 由 此可见, 现有技术提供的方案都需要对终端和非 3GPP网络进行底层的修改, 增加了终端通过非 3GPP网络接入 3GPP核心网的复杂性。
发明内容
本发明实施例提供一种终端通过非 3GPP网络接入 3GPP核心网的系统、 方法及设备,用以在不修改终端和接入网底层的前提下,支持终端通过非 3GPP 网络接入 3GPP核心网, 降低终端通过非 3GPP网络接入 3GPP核心网的复杂 性。
本发明实施例提供一种终端通过非 3GPP网络接入 3GPP核心网的系统, 包括 3GPP核心网设备, 接入网关和终端, 其中:
所述终端, 用于与非 3GPP网络建立连接之后, 向所述接入网关发送隧道 建立请求,请求建立与所述接入网关之间的隧道, 所述隧道建立请求中携带有 公用数据网 PDN连接类型; 并接收所述接入网关发送的网络地址;
所述接入网关, 用于在接收到所述隧道建立请求之后, 向 3GPP核心网设 备发送 PDN连接建立请求,请求建立与所述 3GPP核心网设备之间的 PDN连 接, 所述 PDN连接建立请求中携带有所述 PDN连接类型; 在所述 PDN连接 建立成功之后, 接收所述 3GPP核心网设备分配给所述终端的网络地址, 将所 述网络地址发送给所述终端;
所述 3GPP核心网设备,用于根据所述 PDN连接建立请求中携带 PDN连 接类型为所述终端分配网络地址;并将分配给所述终端的网络地址发送给所述 接入网关。
本发明实施例提供一种终端通过非 3GPP网络接入 3GPP核心网的方法, 包括:
接入网关接收终端发送的隧道建立请求,所述隧道建立请求中携带有公用 数据网 PDN连接类型;
所述接入网关向 3GPP核心网设备发送 PDN连接建立请求, 请求与所述 3GPP核心网建立 PDN连接,所述 PDN连接建立请求中携带有所述 PDN连接 类型; 以及
接收所述 3GPP核心网设备在 PDN连接建立成功之后,根据所述 PDN连 接类型为所述终端分配的网络地址;
所述接入网关将所述网络地址发送给所述终端。
本发明实施例提供一种接入网关, 包括:
第一接收单元, 用于接收终端发送的隧道建立请求, 所述隧道建立请求中 携带有公用数据网 PDN连接类型;
第一发送单元, 用于向 3GPP核心网设备发送 PDN连接建立请求, 请求 建立与所述 3GPP核心网设备之间的 PDN连接,所述 PDN连接建立请求中携 带有所述 PDN连接类型;
第二接收单元, 用于接收所述 3GPP核心网设备在 PDN连接建立成功之 后, 根据所述 PDN连接类型为所述终端分配的网络地址;
第二发送单元, 用于将所述网络地址发送给所述终端。
本发明实施例提供一种终端, 包括:
第一发送单元, 用于与非 3GPP网络建立连接之后, 向接入网关发送隧道 建立请求,请求建立与所述接入网关之间的隧道, 所述隧道建立请求中携带有 公用数据网 PDN连接类型;
接收单元, 用于接收所述接入网关发送的网络地址, 所述接入网关根据所 述隧道建立请求中携带的 PDN连接类型向 3GPP核心网设备请求分配给所述 终端的网络地址。
本发明实施例提供的非 3GPP网络接入 3GPP核心网的系统、方法及设备, 终端向接入网关发送隧道建立请求, 同时携带 PDN连接请求相关的信息, 接 入网关在接收到终端发送的隧道建立请求之后,与 3GPP核心网设备建立 PDN 连接,然后向终端发送隧道建立请求的响应消息,并在该响应消息中携带 3GPP 核心网设备为终端分配的网络地址, 至此, 终端与接入网关之间的隧道建立完 成, 同时与 3GPP核心网之间的 PDN连接也建立完成。 在上述过程中, 无需
对终端和非 3GPP 网络底层进行修改, 便实现了终端通过非 3GPP 网络接入 3GPP核心网, 降低了终端通过非 3GPP网络接入 3GPP核心网的复杂性。 本发明的其它特征和优点将在随后的说明书中阐述, 并且,部分地从说明 书中变得显而易见, 或者通过实施本发明而了解。本发明的目的和其他优点可 通过在所写的说明书、权利要求书、 以及附图中所特别指出的结构来实现和获 付。
附图说明
图 1为本发明实施例中, 终端通过非 3GPP网络接入 3GPP核心网的场景 示意图;
图 2为本发明实施例中, 终端通过非 3GPP网络接入 3GPP核心网的方法 实施流程示意图;
图 3a为本发明实施例中,接入网关和 PGW之间采用 PMIP隧道协议的协 议栈示意图;
图 3b为本发明实施例中, 接入网关和 PGW之间采用 GTP隧道协议的协 议栈示意图;
图 4为本发明实施例中, 终端通过非 3GPP网络接入 3GPP核心网的流程 示意图;
图 5为本发明实施例中, 为终端请求从 3GPP接入方式切换到非 3GPP接 入方式的实施流程示意图;
图 6为本发明实施例中, 终端同时通过 3GPP 网络和非 3GPP 网络接入
3GPP核心网时, 进行流移动性操作的流程示意图;
图 7为本发明实施例中, 终端通过非 3GPP网络接入 3GPP核心网络的系 统结构示意图;
图 8为本发明实施例中, 接入网关的结构示意图; 图 9为本发明实施例中, 终端的结构示意图。
具体实施方式
本发明实施例提供了一种当终端通过可信非 3GPP网络(如 WLAN )接入 到移动运营商 3GPP核心网时, 非 3GPP网络的具体实现方法。 为了便于理解 本发明实施例, 以下以 3GPP移动通信网场景为例, 阐述本发明。
本发明适用于终端通过非 3GPP网络接入到 3GPP核心网的场景。 如图 1 所示, 终端通过接入点接入到非 3GPP网络, 并通过接入网关接入到移动运营 商的 3GPP核心网进行信令的交互和数据通信。 此时, 终端可以通过非 3GPP 网络和 3GPP 网络同时接入到 3GPP核心网, 但目前尚未解决的问题包括: 终端如何发起到 3GPP核心网的公用数据网 ( PDN, Public Data Network ) 连接建立请求和连接释放请求; 为支持业务的连续性, 终端如何在建立连接时 给出相关指示;为在非 3GPP网络与 3GPP网络间进行流移动性操作,非 3GPP 网络内如何实现。
为了解决上述问题, 本发明实施例在终端和接入网关之间建立隧道,通过 该隧道传输与连接建立、 切换和流移动性等相关的信令信息。
以下结合说明书附图对本发明的优选实施例进行说明,应当理解, 此处所 描述的优选实施例仅用于说明和解释本发明, 并不用于限定本发明, 并且在不 如图 2所示, 为本发明实施例提供的终端通过非 3GPP网络接入 3GPP核 心网的方法实施流程示意图, 包括:
S201、接入网关接收终端发送的隧道建立请求,所述隧道建立请求中携带 有 PDN连接类型;
具体实施中,终端发现非 3GPP网络,完成与非 3GPP网络的连接和鉴权。 终端检测发现当前有可信非 3GPP网络(如 WLAN ),则终端按照现有非 3GPP 接入方法与非 3GPP接入网连接, 并通过相应的鉴权。 当终端接入非 3GPP网 络之后, 向接入网关发起隧道建立请求, 同时携带有 PDN连接请求的相关信
息, 可以包括 APN (接入点名称), PDN连接类型, 数据流描述信息、 数据流 标识符, 多接入标识, 切换指示等。 其中, PDN 连接类型可以为 IPV4, 和 / 或 IPV6, 即可以为 IPV4, 也可以为 IPV6, 或者是 IPV4V6。
S202、 接入网关向 3GPP核心网设备发送 PDN连接建立请求, 请求与该 3GPP核心网建立 PDN连接,该 PDN连接建立请求中携带有所述 PDN连接类 型;
接入网关在接收到终端发送的隧道建立请求之后, 与 3GPP核心网设备之 间执行 3GPP相关流程, 对终端进行 3GPP核心网设备的认证和授权, 并建立 与 3GPP核心网设备之间的 PDN连接,具体的,可以通过 GPRS隧道协议( GTP , GPRS Tunnel Protocol )或代理移动 IP ( PMIP, Proxy Mobile IP )协议建立与 3GPP核心网之间的 GTP隧道或者 PMIP隧道。
5203、 3GPP核心网设备在 PDN连接建立成功之后, 根据 PDN连接建立 请求中携带的 PDN连接类型为终端分配网络地址;
3GPP核心网设备在建立与接入网关之间的 GTP隧道或者 PMIP隧道之 后, 为终端分配网络地址。 具体的, 若 PDN连接请求中携带的 PDN连接类型 为 IPV4时, 3GPP核心网设备为该终端分配的网络地址为 IPV4地址; 若 PDN 连接请求中携带的 PDN连接类型为 IPV6时, 3GPP核心网设备为该终端分配 的网络地址为 IPV6地址前缀; 若 PDN连接请求中携带的 PDN连接类型为 IPV4V6时, 3GPP核心网设备为该终端分配的网络地址为 IPV4地址或 IPV6 地址前缀。
5204、 接入网关将接收到的网络地址发送给终端。
具体的, 当接入网关接收到 3GPP核心网设备发送的网络地址之后, 向终 端发送隧道建立请求的响应消息, 同时在该响应消息中携带 3GPP核心网设备 为终端分配的网络地址。
具体实施中,当终端需要去附着或者断开与 3GPP核心网设备之间的 PDN
连接时, 终端向接入网关发起隧道释放请求, 该隧道释放请求中携带需要释放 的 PDN连接标识, 其中, PDN连接标识可以为 3GPP核心网设备为终端分配 的网络地址。 在与 3GPP核心网设备的连接释放后, 接入网关向终端返回隧道 释放请求的响应消息, 释放接入网关与终端之间的隧道, 至此, 终端与 3GPP 核心网设备间的 PDN连接释放。
接入网关与终端之间的隧道协议可以但不限于采用会话发起协议( SIP , Session Initial Protocol ), 为了便于描述, 以下实施例中均以终端和接入网关之 间采用的隧道协议为 SIP协议为例进行说明,但采用 SIP协议并不用于限定本 发明的其它实现方式。
SIP协议是一种在 IP网络上进行多媒体通信的信令协议。通用的 SIP消息 包括: 开始行、 消息头和消息体三部分, 其中开始行和消息头字段与参数内容 较固定, 为实现与 3GPP核心网的交互, 本发明实施例中, 通过对 SIP消息体 中的会话描述协议(SDP, Session Description Protocol ) 字段进行增强来实现 终端与接入网关之间的信令交互, 即, 在隧道建立请求中, 通过对 SIP消息体 中的 SDP字段中加入设定的关键字, 并为关键字进行设定的赋值的方式来携 带切换指示符; 在实际应用中, 关键字可以包括: 用于表征会话发起者标识和 会话标识的关键字、 用于表征会话名称的关键字和会用于表征话信息的关键 字。 关键字的设定, 以及为关键字进行设定的赋值的具体方式如表 1至表 10 所示。
分别如图 3a和图 3b所示, 为本发明实施例中, 在终端和接入网关之间建 立用于控制面的 SIP隧道, 终端、 接入网关、 核心网设备之间控制面的协议栈 示意图,其中,核心网设备可以为公用数据网网关( PGW , Public Data Network Gateway )。
图 3a 中, 接入网关和 PGW之间采用 PMIP隧道协议进行信令交互。 具 体的, 终端和接入网关之间: 由下至上分别为物理层和数据链路层 L1/L 2, 网
络层采用 IP 协议, 传输层采用传输控制协议 (TCP, Transmission Control Protocol )或者用户数据包协议( UDP, User Datagram Protocol ), 应用层采用 SIP协议; 接入网关和 PGW之间: 由下至上分别为物理层和数据链路层 L1/L 2, 网络层采用 IPV4/IPV6协议, 传输层和应用层均采用 PMIPV6协议。
图 3b中, 接入网关和 PGW之间采用 GTP隧道协议进行信令交互。 具体 的, 终端和接入网关之间: 由下至上分别为物理层和数据链路层 L1/L 2, 网络 层采用 Ip协议, 传输层采用 TCP/UDP协议, 应用层采用 SIP协议; 接入网关 和 PGW之间: 由下至上分别为物理层和数据链路层 L1/L 2, 网络层采用 IPV4/IPV6协议, 传输层采用 UDP协议, 应用层采用 GTP-C协议。
如图 4所示, 为本发明实施例中, 终端通过非 3GPP网络接入 3GPP核心 网的流程示意图, 包括如下步骤:
5401、 终端检测发现非 3GPP网络, 与非 3GPP网络建立连接, 并通过相 应的鉴权;
5402、 终端向接入网关发出 SIP信令 INVITE, 发起隧道建立请求, 同时 携带用于初始附着的 PDN连接建立请求相关的信息;
具体的, 在该 SIP信令中, 会话描述协议( SDP ) 中关键字取值如表 1所 示:
表 1
关键字 关键字描述 本发明中的关键字取值 名
0 = 会话发起者标识和会话 终端标识符, 新的会话号
标识
s = 会话名称 WLAN Access ( WLAN 接
入)
1 = 会话信息 接入点名称、 PDN连接类型
( IPv4、 IPv6、 或 IPv4v6 )、 数据流描述信息、 数据流标 识符(可选)
其中,终端标识符可以为国际移动用户识别码( IMSI, International Mobile Subscriberldentification Number )。
5403、 接入网关向终端发送 SIP Trying应答, 表明已经接收到上述消息。
5404、接入网关与核心网设备的 PDN连接建立成功(即建立了 GTP隧道 或 PMIP隧道 );
5405、 接入网关向终端发出 SIP OK成功应答, 表示 SIP隧道建立成功, 同时携带核心网设备分配给终端的网络地址。在该 SIP信令中,会话描述协议
( SDP ) 中的关键字取值如表 2所示:
表 2
5406、终端向接入网关发出 SIP确认响应, 终端与接入网关之间的隧道建 立成功, 且与 3GPP核心网设备间的 PDN连接建立成功;
5407、 当终端要去附着或要断开与 3GPP核心网间的 PDN连接时, 终端 向接入网关发起 SIP BYE信令来释放所述隧道,在该 SIP信令中,会话描述协 议( SDP ) 中的关键字取值如表 3所示:
关键字 关键字描述 本发明中的关键字取值 名
0 = 会话发起者标识和会话 终端标识符 (IMSI ), 要释
标识 放的会话号
s = 会话名称 WLAN Access
1 = 会话信息 要释放的 PDN 连接标识符
(本发明采用核心网分配给 终端的网络地址)
S408、 接入网关向终端发起 SIP OK确认, 确认隧道释放。
此时, 终端与接入网关之间的隧道被释放。
特别地, 若终端在与非 3GPP网络建立连接之前, 已通过 3GPP网络接入 3GPP核心网时, 若终端希望将现有的 3GPP接入网络切换为非 3GPP接入网 络,且不对用户当前业务产生影响, 则终端可以通过在隧道建立请求中携带切 换指示符, 告知 3GPP核心网设备自身已经通过 3GPP网络接入了 3GPP核心 网。 3GPP核心网设备在发现终端需要进行接入网络的切换时(通过接入网关 发送的 PDN连接请求中携带有切换指示符),将终端通过 3GPP网络接入 3GPP 核心网时, 为该终端分配的网络地址重新分配给该终端。 这样, 便能够满足业 务的连续性要求。
具体实施中, 终端请求进行接入方式的切换的前提是终端在请求通过非
3GPP网络接入 3GPP核心网之前, 已经通过 3GPP网络接入 3GPP核心网, 当 终端发现非 3GPP网络并准备切换到非 3GPP接入方式时, 如图 5所示, 为终 端请求从 3GPP接入方式切换到非 3GPP接入方式的实施流程示意图, 包括如 下步骤:
S501、 终端检测发现非 3GPP网络, 与非 3GPP网络建立连接, 并通过相
应的鉴权;
S502、 终端向接入网关发出 SIP信令 INVITE, 发起隧道建立请求, 同时 携带 PDN连接建立请求相关的信息, 并在请求中携带切换指示符;
具体的, 在该 SIP信令中, 会话描述协议(SDP ) 中的关键字取值如表 4 所示:
表 4
5503、 接入网关向终端发出 SIP Trying应答, 表明已经接收到上述消息;
5504、接入网关与核心网设备的 PDN连接建立成功(即建立了相应的 GTP 隧道或 PMIP隧道 );
5505、 接入网关向终端发出 SIP OK成功应答, 表示 SIP隧道建立成功, 同时携带核心网设备为终端分配的 IP地址;
由于在步骤 S502中, 终端发送的隧道建立请求中携带了切换指示符, 因 此核心网设备分配给终端的网络地址和之前分配给终端的网络地址相同; 在该 SIP信令中, 会话描述协议(SDP ) 中关键字取值如表 5所示:
表 5
关键字
关键字描述 本发明中的关键字取值 名 会话发起者标识和会话 终端标识符 (IMSI ), 当前
0 =
标识 会话号 s = 会话名称 WLAN Access
核心网分配给终端的 IPv4
1 = 会话信息
地址或 IPv6地址前缀
S506、终端向接入网关发出 SIP确认响应, 终端与接入网关间的 SIP隧道 建立成功, 且用于切换的 PDN连接建立成功;
此时, 终端可通过该 SIP隧道实现与 3GPP核心网间的通信。 在切换后, 3GPP核心网与终端间根据现有信令流程释放原来通过 3GPP网络接入到 3GPP 核心网的 PDN连接相关的资源。
较佳地, 当终端同时通过 3GPP网络和非 3GPP网络同时接入 3GPP核心 网时, 终端可以通过与接入网关之间的隧道向接入网关发起流移动性请求, 即 实现部分业务流在 3GPP网络和非 3GPP网络之间的移动。 具体的, 终端向接 入网关发送第一流移动性请求,请求将 3GPP接入方式的数据流迁移到非 3GPP 接入方式, 或者将非 3GPP接入方式的数据流迁移到 3GPP接入方式, 该第一 流移动性请求中携带有要迁移的数据流的流标识和该数据流对应的要迁移到 的接入方式, 其中, 接入方式包括非 3GPP接入方式和 3GPP接入方式两种; 接入网关, 还用于在接收到第一流移动性请求之后, 向 3GPP核心网设备发送 第二流移动性请求,该第二流移动性请求中携带有要迁移的数据流的流标识和 该数据流对应的要迁移到的接入方式; 3GPP核心网设备, 还用于在接收到第 二流移动性请求之后,若流标识对应的数据流要迁移到的接入方式为 3GPP接 入方式, 则根据现有的通信流程增加相应承载或对现有承载进行修改, 以便可 以接受所述数据流; 若流标识对应的数据流要迁移到的接入方式为非 3GPP接
入方式, 则根据现有的通信流程对现有的承载进行修改或删除。
具体实施中, 当终端同时通过 3GPP网络和非 3GPP网络接入 3GPP核心 网时, 终端通过 SIP信令可以发起流移动性请求, 这样, 便能够实现部分业务 流在 3GPP网络和非 3GPP网络之间的移动。
为了支持流移动性,在终端内部需要存储一个接入方式与流标识信息之间 的映射表, 该映射表的结构可以如表 6所示:
表 6
S601、 终端向接入网关发出 SIP信令 UPDATE, 发起流移动性请求, 流移 动性请求中携带需要移动的数据流信息;
在该 SIP信令中, 会话描述协议(SDP ) 中的关键字取值如表 7所示: 表 7
关键字 关键字描述 本发明中的关键字取值 名
0 = 会话发起者标识和会话 终端标识符 (IMSI ), 当前 标识 会话号
s = 会话名称 WLAN Access
1 = 会话信息 要移动的数据流信息的列
表, 列表中每一项都包括数 据流描述信息和相对应的要 迁移到的接入方式。
5602、 接入网关向终端发出 SIP Trying应答, 表明已经接收到上述消息;
5603、 3GPP核心网设备根据流移动性信息对承载进行相应的增加 /删除 / 修改;
具体的, 以将数据流从 3GPP网络移动到非 3GPP网络为例, 3GPP核心 网设备根据接收到的数据流标识,将该数据流标识对应的承载信息进行修改或 者删除该承载。
5604、接入网关向终端发出 SIP OK成功应答,表示流移动性请求被接受, 同时携带被接受的流移动性信息;
在该 SIP信令中, 会话描述协议(SDP ) 中关键字取值如表 8所示:
表 8
关键字 关键字描述 本发明中的关键字取值
名
0 = 会话发起者标识和会话 终端标识符(IMSI ), 当前会话号
标识
s = 会话名称 WLAN Access
1 = 会话信息 接受的数据流移动性信息的列表, 列
表中每一项都包括数据流描述信息和
相对应的迁移到的接入方式 ε
S605、 终端向接入网关发出 SIP确认响应, 流移动性请求成功, 新的路由 规则建立;
在流移动性过程结束后,终端中存储的接入方式与流信息的映射表信息将 发生变化,假设在流移动性过程之前,本实施例中终端映射表信息如表 9所示: 表 9
本发明实施例的流移动性过程结束后, 将 3GPP接入方式的数据流 l(FlowIDl)迁移到 WLAN接入方式, 则流移动过程完成后本实施例中终端映 射关系如表 10所示:
表 10
PDN连接标 接入方式信 数据流标识 业务数据流描述 识 息 符(可选) 信息
3GPP核 3GPP接入方 FlowID2 业务数据流描述 心网设备针 式 信息 2
对该 PDN连 WLAN接入 FlowIDl 业务数据流描述 接分配给终 方式 信息 1
端的网络地 FlowID3 业务数据流描述 址 信息 3
FlowID4 业务数据流描述
信息 4 上述实施例中以将数据流从 3GPP网络迁移到非 3GPP网络为例, 对本发 明实施例实现流移动性的实施流程进行说明,将数据流从非 3GPP网络迁移到 3GPP网络的实施流程可以参照上述流程, 这里不再赘述。
本发明实施例提供一种为支持接入到 3GPP核心网中, 非 3GPP网络内部 的实现方法。 本发明实施例在终端和接入网关之间建立 IP层之上的控制面上 的隧道, 来实现终端和接入网关之间进行接入、 切换和流移动的相关通信。 该 方法不仅实现灵活筒单, 可扩展性强, 同时能够减少对非 3GPP网络底层的影 响, 而且与 3GGPP网络和 3GPP核心网之间接口上的具体协议无关。
基于同一发明构思,本发明实施例中还提供一种终端通过非 3GPP网络接 入 3GPP核心网的系统以及一种接入网关和终端, 由于该系统以及相关设备解 决问题的原理与终端通过非 3GPP网络接入 3GPP核心网的方法相似, 因此该 系统及相关设备的实施可以参见终端通过非 3GPP网络接入 3GPP核心网的方 法的实施, 重复之处不再赘述。
如图 7所示, 为本发明实施例提供的终端通过非 3GPP网络接入 3GPP核 心网络的系统结构示意图, 包括 3GPP核心网设备 701 , 接入网关 702和终端 703, 其中:
终端 703, 用于与非 3GPP网络建立连接之后, 向接入网关发送隧道建立 请求,请求建立与所述接入网关之间的隧道, 该隧道建立请求中携带有公用数
据网 PDN连接类型; 并接收接入网关 702发送的网络地址;
接入网关 702,用于在接收到终端 703发送的隧道建立请求之后,向 3GPP 核心网设备 701发送 PDN连接建立请求, 请求建立与 3GPP核心网设备 701 之间的 PDN连接, 该 PDN连接建立请求中携带有 PDN连接类型; 在 PDN连 接建立成功之后, 接收 3GPP核心网设备 701分配给终端 703的网络地址, 将 该网络地址发送给终端 703;
3GPP核心网设备 701 , 用于根据 PDN连接建立请求中携带 PDN连接类 型为终端 703分配网络地址;并将分配给终端 703的网络地址发送给接入网关 702。
其中, 隧道建立请求中携带的 PDN连接类型包括 IPV4, 和 /或 IPV6, 据 此, 3GPP核心网设备 701 , 可以用于当 PDN连接类型为 IPV4时, 分配给终 端 703的网络地址为 IPV4地址;当 PDN连接类型为 IPV6时,分配给终端 703 的网络地址为 IPV6地址的前缀; 当 PDN连接类型为 IPV4和 IPV6时, 分配 给终端 703的网络地址为 IPV4地址或者 IPV6地址的前缀。
特别地,终端 703,还可以用于与非 3GPP网络建立连接之前,已通过 3GPP 网络接入 3GPP核心网时,若终端希望将现有的 3GPP接入网络切换为非 3GPP 接入网络,且不对用户当前业务产生影响, 则终端在隧道建立请求中携带有切 换指示符;
接入网关 702, 还可以用于在 PDN连接请求中携带该切换指示符; 3GPP核心网设备 701 ,可以用于将终端 703通过 3GPP网络接入 3GPP核 心网时, 分配给终端 703的网络地址重新分配给终端 703。
较佳地, 终端 703, 还可以用于当同时通过 3GPP网络和非 3GPP网络同 时接入 3GPP核心网时,通过与接入网关 702之间的隧道向接入网关 702发送 第一流移动性请求,请求将 3GPP接入方式的数据流迁移到非 3GPP接入方式, 或者将非 3GPP接入方式的数据流迁移到 3GPP接入方式, 该第一流移动性请
求中携带有要迁移的数据流的流标识和该数据流对应的要迁移到的接入方式, 接入方式包括非 3GPP接入方式和 3GPP接入方式;
接入网关 702, 还用于在接收到第一流移动性请求之后, 向 3GPP核心网 设备发送第二流移动性请求,该第二流移动性请求中携带有要迁移的数据流的 流标识和该数据流对应的要迁移到的接入方式;
3GPP核心网设备 701 , 还用于在接收到第二流移动性请求之后, 若流标 识对应的数据流要迁移到的接入方式为 3GPP接入方式,则根据现有的通信流 程增加相应承载或对现有承载进行修改, 以便可以接受所述数据流; 若流标识 对应的数据流要迁移到的接入方式为非 3GPP接入方式,则根据现有的通信流 程对现有的承载进行修改或删除。
较佳地,终端 703与接入网关 702之间采用会话发起协议 SIP通过建立的 隧道传输信令。
如图 8所示, 为本发明实施例提供的接入网关的结构示意图, 包括: 第一接收单元 801 , 用于接收终端发送的隧道建立请求, 该隧道建立请求 中携带有 PDN连接类型;
第一发送单元 802,用于向 3GPP核心网设备发送 PDN连接建立请求,请 求建立与 3GPP核心网设备之间的 PDN连接,该 PDN连接建立请求中携带有 PDN连接类型;
第二接收单元 803 , 用于接收网络地址; 所述网络地址是由所述 3GPP核 心网设备在 PDN连接建立成功之后,根据所述 PDN连接类型为所述终端分配 的;
第二发送单元 804 , 用于将接收到的网络地址发送给终端。
具体实施中, 第一接收单元 801 , 可以用于在终端与非 3GPP网络建立连 接之前,通过 3GPP网络接入 3GPP核心网时,接收终端发送的隧道建立请求, 该隧道建立请求中携带有 PDN连接类型和切换指示符;
第一发送单元 802, 还用于将切换指示符携带在 PDN连接请求中发送给 3GPP核心网设备;
第一指示单元, 用于指示 3GPP核心网设备将终端通过 3GPP 网络接入 3GPP核心网时, 分配给终端的网络地址重新分配终端。
具体实施中, 接入网关, 还可以包括:
第三接收单元, 用于在终端通过 3GPP网络同时接入 3GPP核心网时, 接 收终端根据自身存储的接入方式与流标识映射表发送的第一流移动性请求,该 第一流移动性请求中携带有要迁移的数据流的流标识和该数据流对应的接入 方式, 该接入方式包括非 3GPP接入方式和 3GPP接入方式;
第三发送单元, 用于在接收到第一流移动性请求之后, 向 3GPP核心网设 备发送第二流移动性请求,该第二流移动性请求中携带有要迁移的数据流的流 标识和该数据流对应的接入方式;
第二指示单元,用于指示 3GPP核心网设备根据接收到的第二流移动性请 求, 若流标识对应的数据流接入方式为 3GPP接入方式, 则将流标识对应的数 据流迁移到非 3GPP接入方式, 若流标识对应的数据流接入方式为非 3GPP接 入方式, 则将流标识对应的数据流迁移到 3GPP接入方式。
如图 9所示, 为本发明实施例提供的终端的结构示意图, 包括: 第一发送单元 901 , 用于与非 3GPP网络建立连接之后, 向接入网关发送 隧道建立请求,请求建立与该接入网关之间的隧道, 该隧道建立请求中携带有 PDN连接类型;
接收单元 902, 用于接收接入网关发送的网络地址, 接入网关根据隧道建 立请求中携带的 PDN连接类型向 3GPP核心网设备请求分配给终端的网络地 址。
其中, 第一发送单元 901 , 还用于与非 3GPP网络建立连接之前, 本终端 通过 3GPP网络接入 3GPP核心网时, 在隧道建立请求中携带切换指示符。
具体实施中, 本发明实施例提供的终端, 还可以包括:
存储单元, 用于存储接入方式与流标识映射表;
第二发送单元, 用于与接入网关建立隧道之后, 当本终端通过 3GPP网络 同时接入 3GPP核心网时, 向接入网关发送流移动性请求, 请求将 3GPP接入 方式的数据流迁移到非 3GPP接入方式, 或者将非 3GPP接入方式的数据流迁 移到 3GPP接入方式,该流移动性请求中携带有要迁移的数据流的流标识和该 数据流对应的接入方式,该接入方式包括非 3GPP接入方式和 3GPP接入方式。
本领域内的技术人员应明白, 本发明的实施例可提供为方法、 系统、 或计 算机程序产品。 因此, 本发明可采用完全硬件实施例、 完全软件实施例、 或结 合软件和硬件方面的实施例的形式。 而且, 本发明可采用在一个或多个其中包 含有计算机可用程序代码的计算机可用存储介质 (包括但不限于磁盘存储器、
CD-ROM, 光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、 设备(系统)、 和计算机程序产 品的流程图和 /或方框图来描述的。应理解可由计算机程序指令实现流程图和 /或方框图中的每一流程和 /或方框、以及流程图和 /或方框图中的流程和 / 或方框的结合。 可提供这些计算机程序指令到通用计算机、 专用计算机、 嵌入 式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算 个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设 备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中 的指令产生包括指令装置的制造品,该指令装置实现在流程图一个流程或多个 流程和 /或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使 得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处
理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个 流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基 本创造性概念, 则可对这些实施例做出另外的变更和修改。 所以, 所附权利要 求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
本发明实施例提供的非 3GPP网络接入 3GPP核心网的系统、方法及设备, 终端向接入网关发送隧道建立请求, 同时携带 PDN连接请求相关的信息, 接 入网关在接收到终端发送的隧道建立请求之后,与 3GPP核心网设备建立 PDN 连接,然后向终端发送隧道建立请求的响应消息,并在该响应消息中携带 3GPP 核心网设备为终端分配的网络地址, 至此, 终端与接入网关之间的隧道建立完 成, 同时与 3GPP核心网之间的 PDN连接也建立完成。 在上述过程中, 无需 对终端和非 3GPP 网络底层进行修改, 便实现了终端通过非 3GPP 网络接入 3GPP核心网, 降低了终端通过非 3GPP网络接入 3GPP核心网的复杂性。
明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及 其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。
Claims
1、 一种终端通过非 3GPP网络接入 3GPP核心网的方法, 其特征在于, 包括:
接入网关接收终端发送的隧道建立请求,所述隧道建立请求中携带有公用 数据网 PDN连接类型;
所述接入网关向 3GPP核心网设备发送 PDN连接建立请求, 请求与所述 3GPP核心网建立 PDN连接,所述 PDN连接建立请求中携带有所述 PDN连接 类型;
所述接入网关接收网络地址; 所述网络地址是由所述 3GPP核心网设备在 PDN连接建立成功之后, 根据所述 PDN连接类型为所述终端分配;
所述接入网关将所述网络地址发送给所述终端。
2、 如权利要求 1所述的方法, 其特征在于, 所述终端与非 3GPP网络建 立连接之前, 已通过 3GPP网络接入 3GPP核心网时, 所述隧道建立请求中还 携带有切换指示符; 以及
所述方法, 还包括:
所述接入网关向 3GPP核心网设备发送 PDN连接建立请求, 在所述 PDN 连接请求中携带所述切换指示符,指示所述 3GPP核心网设备将所述终端通过 3GPP网络接入 3GPP核心网时, 分配给所述终端的网络地址重新分配所述终 端。
3、 如权利要求 1 所述的方法, 其特征在于, 当所述终端同时通过 3GPP 网络接入所述 3GPP核心网时, 所述方法, 还包括:
所述接入网关接收所述终端发送的第一流移动性请求,所述第一流移动性 请求中携带有要迁移的数据流的流标识和该数据流对应的要迁移到的接入方 式, 所述接入方式包括非 3GPP接入方式和 3GPP接入方式; 并
在接收到所述第一流移动性请求之后, 向所述 3GPP核心网设备发送第二 流移动性请求,所述第二流移动性请求中携带有要迁移的数据流的流标识和该 数据流对应的要迁移到的接入方式;
所述 3GPP核心网设备根据接收到的第二流移动性请求,若流标识对应的 数据流要迁移到的接入方式为 3GPP接入方式,则增加承载或对现有承载进行 修改; 若流标识对应的数据流要迁移到的接入方式为非 3GPP接入方式, 则对 现有承载进行修改或删除。
4、 一种接入网关, 其特征在于, 包括:
第一接收单元, 用于接收终端发送的隧道建立请求, 所述隧道建立请求中 携带有公用数据网 PDN连接类型;
第一发送单元, 用于向 3GPP核心网设备发送 PDN连接建立请求, 请求 建立与所述 3GPP核心网设备之间的 PDN连接,所述 PDN连接建立请求中携 带有所述 PDN连接类型;
第二接收单元, 用于接收网络地址; 所述网络地址是由所述 3GPP核心网 设备在 PDN连接建立成功之后, 根据所述 PDN连接类型为所述终端分配; 第二发送单元, 用于将所述网络地址发送给所述终端。
5、 如权利要求 4所述的接入网关, 其特征在于,
所述第一接收单元, 还用于在所述终端与非 3GPP网络建立连接之前, 已 通过 3GPP网络接入 3GPP核心网时, 接收终端发送的隧道建立请求, 所述隧 道建立请求中携带有 PDN连接类型和切换指示符;
所述第一发送单元, 还用于将所述切换指示符携带在所述 PDN连接请求 中发送给所述 3GPP核心网设备, 指示所述 3GPP核心网设备将所述终端通过 3GPP网络接入 3GPP核心网时, 分配给所述终端的网络地址重新分配所述终 端。
6、 如权利要求 4所述的接入网关, 其特征在于, 还包括:
第三接收单元, 用于在所述终端通过 3GPP网络同时接入所述 3GPP核心 网时,接收所述终端发送的第一流移动性请求, 所述第一流移动性请求中携带 有要迁移的数据流的流标识和该数据流对应的要迁移到的接入方式,所述接入 方式包括非 3GPP接入方式和 3GPP接入方式;
第三发送单元, 用于在接收到所述第一流移动性请求之后, 向所述 3GPP 核心网设备发送第二流移动性请求,所述第二流移动性请求中携带有要迁移的 数据流的流标识和该数据流对应的要迁移到的接入方式。
7、 一种终端, 其特征在于, 包括:
第一发送单元, 用于与非 3GPP网络建立连接之后, 向接入网关发送隧道 建立请求,请求建立与所述接入网关之间的隧道, 所述隧道建立请求中携带有 公用数据网 PDN连接类型;
接收单元, 用于接收所述接入网关发送的网络地址, 所述接入网关根据所 述隧道建立请求中携带的 PDN连接类型向 3GPP核心网设备请求分配给所述 终端的网络地址。
8、 如权利要求 7所述的终端, 其特征在于,
所述第一发送单元, 还用于与非 3GPP网络建立连接之前, 已通过 3GPP 网络接入 3GPP核心网时, 在所述隧道建立请求中携带切换指示符。
9、 如权利要求 7所述的终端, 其特征在于, 还包括:
存储单元, 用于存储接入方式与流标识映射表;
第二发送单元, 当本终端同时通过 3GPP网络同时接入 3GPP核心网时, 向所述接入网关发送流移动性请求,请求将 3GPP接入方式的数据流迁移到非 3GPP接入方式, 或者将非 3GPP接入方式的数据流迁移到 3GPP接入方式, 所述流移动性请求中携带有要迁移的数据流的流标识和该数据流对应的要迁 移到的接入方式, 所述接入方式包括非 3GPP接入方式和 3GPP接入方式。
10、 一种终端通过非 3GPP网络接入 3GPP核心网的系统, 其特征在于,
包括 3GPP核心网设备, 接入网关和终端, 其中:
所述终端, 用于与非第三代合作伙伴项目 3GPP网络建立连接之后, 向所 述接入网关发送隧道建立请求,请求建立与所述接入网关之间的隧道, 所述隧 道建立请求中携带有公用数据网 PDN连接类型; 并接收所述接入网关发送的 网络地址;
所述接入网关, 用于在接收到所述隧道建立请求之后, 向 3GPP核心网设 备发送 PDN连接建立请求,请求建立与所述 3GPP核心网设备之间的 PDN连 接, 所述 PDN连接建立请求中携带有所述 PDN连接类型; 在所述 PDN连接 建立成功之后, 接收所述 3GPP核心网设备分配给所述终端的网络地址, 将所 述网络地址发送给所述终端;
所述 3GPP核心网设备,用于根据所述 PDN连接建立请求中携带 PDN连 接类型为所述终端分配网络地址;并将分配给所述终端的网络地址发送给所述 接入网关。
11、 如权利要求 10所述的系统, 其特征在于, 所述 PDN连接类型包括 IPV4, 和 /或 IPV6; 以及
所述 3GPP核心网设备, 具体用于当所述 PDN连接类型为 IPV4时, 分配 给所述终端的网络地址为 IPV4地址; 当所述 PDN连接类型为 IPV6时, 分配 给所述终端的网络地址为 IPV6地址的前缀; 当所述 PDN连接类型为 IPV4和
12、 如权利要求 10所述的系统, 其特征在于,
所述终端, 还用于与非 3GPP网络建立连接之前, 已通过 3GPP网络接入 3GPP核心网时, 在所述隧道建立请求中携带切换指示符; 以及
所述接入网关, 还用于在所述 PDN连接请求中携带所述切换指示符; 所述 3GPP核心网设备, 具体用于将所述终端通过 3GPP网络接入 3GPP 核心网时, 分配给所述终端的网络地址重新分配给所述终端。
13、 如权利要求 10所述的系统, 其特征在于,
所述终端, 还用于当同时通过 3GPP网络接入 3GPP核心网时, 通过与接 入网关之间的隧道向所述接入网关发送第一流移动性请求,请求将 3GPP接入 方式的数据流迁移到非 3GPP接入方式, 或者将非 3GPP接入方式的数据流迁 移到 3GPP接入方式,所述第一流移动性请求中携带有要迁移的数据流的流标 识和该数据流对应的要迁移到的接入方式,所述接入方式包括非 3GPP接入方 式和 3GPP接入方式;
所述接入网关,还用于在接收到所述第一流移动性请求之后,向所述 3GPP 核心网设备发送第二流移动性请求,所述第二流移动性请求中携带有要迁移的 数据流的流标识和该数据流对应的要迁移到的接入方式;
所述 3GPP核心网设备, 还用于在接收到第二流移动性请求之后, 若流标 识对应的数据流要迁移到的接入方式为 3GPP接入方式,则增加承载或对现有 承载进行修改; 若流标识对应的数据流要迁移到的接入方式为非 3GPP接入方 式, 则对现有的^载进行修改或删除。
14、 如权利要求 10~13任一权利要求所述的系统, 其特征在于, 所述终端 与所述接入网关之间采用会话发起协议 SIP作为隧道协议。
15、 如权利要求 14所述的系统, 其特征在于, 所述切换指示符包括: 对 SIP消息体中的 SDP字段中加入设定的关键字, 并为关键字进行设定 的赋值。
16、 如权利要求 15所述的系统, 其特征在于, 所述关键字包括: 用于表 征会话发起者标识和会话标识的关键字、用于表征会话名称的关键字和会用于 表征话信息的关键字。
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