WO2009129748A1 - 网络选择方法、移动终端、ip地址处理方法及系统 - Google Patents
网络选择方法、移动终端、ip地址处理方法及系统 Download PDFInfo
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- WO2009129748A1 WO2009129748A1 PCT/CN2009/071438 CN2009071438W WO2009129748A1 WO 2009129748 A1 WO2009129748 A1 WO 2009129748A1 CN 2009071438 W CN2009071438 W CN 2009071438W WO 2009129748 A1 WO2009129748 A1 WO 2009129748A1
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- user equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]
Definitions
- the present invention relates to a network technology, and in particular, to a network selection method, a mobile terminal, an access network discovery and selection function network element device, and a network address processing method and system. Background technique
- the user equipment switches from the non-3rd Generation Partnership Project (3GPP) to the non-3GPP network to switch the J3GPP network, including:
- the Non-3GPP Access network element in this step is an Evolved Packet Data Gateway (EPDG); and the Worldwide Interoperability for Microwave Access (Wor ldwide Interoperability)
- EDG Evolved Packet Data Gateway
- ASN GW Access Service Network Gateway
- CDMA Code Division Multiple Access
- the Non-3GPP Access network element in this step is an access gateway (AGW); for a High Rate Packet Data (HRPD) network, the Non-3GPP Access network element in this step is a packet data.
- the UE initiates a handover between the non-3GPP network to the 3GPP network. Sending an Attach Request message to the mobility management network element through the access network element of the 3GPP network; or the UE needs to switch to the 3GPP network, but the UE also resides in the non-3GPP network, and the UE connects through the non-3GPP network.
- the incoming network element sends an attach request message to the mobility management network element.
- GERAN GSM/EDGE Radio Access Network
- UTRAN UMTS Terrestrial Radio Access Network
- MME Mobility Management Ent i ty
- UE mobility management network element
- Home Subscr iber Service Home Subscr iber Service
- the Update Locat and Inser t Subscr iber Data process is performed between the mobility management network element and the HSS.
- the mobility management network element initiates a PDN connection establishment procedure for each access point name (Acces s Point Name, APN) and PGW address record obtained, that is, a Create Defaul t Bearer Reques t message is sent.
- Sending to the PG 0 mobility management network element through the Serving Gateway determines the IP address type used by the UE according to the type of IP address used by the target network, and carries the determined IP address type in the Create Default Bearer Request message.
- the PGW locates the PDN connection used by the UE according to the foregoing message, and the PGW determines the IP address used by the UE according to the IP address type carried in the Create Default Bearer Request message.
- the embodiment of the present invention provides a network selection method and system, and a mobile terminal, so that the UE preferentially selects a target network with the same capability as the source network IP address, so that the IP address used by the UE in the source network can continue to be used in the target network. .
- the embodiment of the invention further provides a method and system for processing an IP address during network switching, so as to enable the UE to continue to use the IP address allocated by the UE in the source network in the target network.
- the embodiment of the invention provides a network selection method, including:
- the user equipment UE By selecting the target network before the network handover, the user equipment UE preferentially selects the target network with the same capability as the source network IP address, so that the IP address used by the UE in the source network can continue to be used in the target network.
- the embodiment of the present invention further provides a method for processing an IP address during network switching, which includes: acquiring IP address information used by a user equipment in a source network;
- IP address information used by the user equipment in the target network according to the IP address information used by the user equipment in the source network
- the embodiment of the invention further provides a mobile terminal, including:
- An available access network information obtaining unit configured to obtain available access network information from the network side; a selecting unit, configured to obtain an available access according to the IP address information used by the user equipment in the source network and the available access network information Select the target network in the network.
- the embodiment of the present invention further provides an access network discovery and selection function network element device, including:
- An IP address obtaining unit configured to acquire IP address information used by the user equipment in the source network
- a selecting unit configured to obtain an available access according to available access network information and IP address information used by the user equipment in the source network Select the target network in the network.
- the embodiment of the present invention further provides a network selection system, including a user equipment, an access network discovery and selection function network element, where the access network discovery and selection function network element is used to provide available access network information;
- the user equipment is configured to obtain available access network information from the access network discovery and selection function network element, and according to the IP address information used by the user equipment in the source network, and The available access network information selects a target network from the available access networks.
- the embodiment of the present invention further provides a network selection system, including a user equipment, an access network discovery and selection function network element, where the user equipment is used for reporting information, and the access network discovery and selection function network element is used. Acquiring the IP address information of the user equipment in the source network according to the report information of the user equipment, and according to the IP address information used by the user equipment in the source network and the available access network information, from the available connection Select the target network in the network.
- a network selection system including a user equipment, an access network discovery and selection function network element, where the user equipment is used for reporting information, and the access network discovery and selection function network element is used.
- the embodiment of the invention further provides an IP address processing system, including:
- An IP address obtaining unit configured to acquire IP address information used by the user equipment in the source network
- a target IP specifying unit configured to specify, according to the IP address information used by the user equipment in the source network, the user equipment in the target network IP address information used in ;
- a notification unit is configured to send the specified IP address information to the user plane anchor gateway.
- the network switching process is implemented by specifying the IP address information.
- the UE can continue to use the IP address allocated by the UE in the source network in the target network.
- FIG. 1 is a schematic structural diagram of a network system according to an embodiment of the present invention
- FIG. 2 is a flowchart of an embodiment of a network selection method according to the present invention.
- FIG. 3 is a corresponding signaling flowchart of the embodiment shown in FIG. 2;
- FIG. 4 is a flowchart of an embodiment of a method for processing an IP address during network switching according to the present invention
- FIG. 5 is a flowchart of an embodiment of an IP address processing method applied to a UE from a non-3GPP network to a 3GPP network or a UE switching from a non-3GPP network to a 3GPP network according to the present invention
- FIG. 6 is a network handover according to the present invention
- the IP address processing method is used for the 3GPP network to switch to the non-3GPP network or the 3GPP network needs to switch to the flowchart of the non-3GPP network embodiment
- FIG. 7 is the IP address processing method for the network handover when the UE is switched from the 3GPP network. Switching to a non-3GPP network or a UE from a 3GPP network needs to switch to a non-3GPP network.
- FIG. 8 is a schematic structural diagram of an embodiment of a network selection system according to the present invention.
- FIG. 9 is a schematic structural diagram of an embodiment of a mobile terminal according to the present invention.
- FIG. 10 is a schematic structural diagram of an embodiment of an IP address processing system according to the present invention. detailed description
- E-UTRAN Evolved UMTS Terrestrial Radio Access Network
- MME Mobility Management Entity
- SGW Serving Gateway
- PGW Packet Data Network Gateway
- PCRF Policy and Charging Rule Function
- HSS Home Subscriber Server
- E-UTRAN 11 is used to implement all functions related to evolved network radio; ⁇ E 12 is responsible for control plane mobility management, including user context and mobility state management, assigning user temporary identity, etc.; SGW 13 is between 3GPP access networks User plane anchor, terminate the interface of E-TURAN 11; PGW 1 is the user plane anchor between the 3GPP access network and the non-3GPP access network, terminating and external packet data network (PDN) Interface (this patent is called user plane anchor gateway).
- the PCRF 15 is used for policy control decisions and flow charging control functions.
- the HSS 16 is used to store user subscription information.
- UTRAN 17 and GERAN 18 are used to implement all of the functions associated with wireless in existing GPRS/UMTS networks.
- Non-3GPP IP Access Network (Non-3GPP IP Access) 20 is mainly an access network defined by non-3GPP organizations, such as Wireless Local Area Network (WLAN), Microwave Access and Worldwide Interoperability for Microwave Access. , that is, Wimax), a network such as Code Division Multiple Access (CDMA).
- the AAA server 21 is configured to perform access authentication, authorization, and charging functions on a User Equipment (UE), that is, the UE 22.
- UE User Equipment
- FIG. 1 is a flowchart of an embodiment of a network selection method according to the present invention.
- FIG. 3 is a flowchart of a corresponding signaling process of the embodiment shown in FIG. 2, which is used to describe a process for obtaining available access network information, and specifically includes: Step 201: Acquire The IP protocol stack supported by the access network, or the IP protocol stack capability type supported by the access network PDN connection, or the IP protocol stack capability type supported by the access network supported IP protocol stack and the available access network PDN connection;
- the UE sends an Access Network Info Request message to the Access Network Discovery and Selection Function (ANDSF) network element to obtain information about the access network where the UE is currently located.
- the functional entity of the ANDSF network element includes the inter-system mobility policy rule specified by the operator, and the available access network information of the current location of the UE.
- the ANDSF network element returns an access network information response (Access Network Info Response) message to the UE 22, and the message carries the available access network information of the current location of the UE 22 and the inter-system mobility policy rule specified by the operator.
- the available access network information includes: access network type (such as E-UTRAN 11 network, Wimax network, CDMA network, etc.), IP protocol stack capability type supported by the access network PDN connection (IP dual stack (ie, a PDN connection can be Use IPv4 address and IPv6 address), IP single stack (that is, only one IPv4 address or IPv6 address can be used in a PDN connection) or IP network stack (IPv4 or IPv6 or IPv4/IPv6) supported by the access network or access network PD The supported IP protocol stack capability type and the IP protocol stack supported by the access network.
- IP dual stack ie, a PDN connection can be Use IPv4 address and IPv6 address
- IP single stack that is, only one IPv4 address or IPv6 address can be used in a
- Step 203 Select a target network according to the IP address information used by the PDN connection in the source network and the IP protocol stack capability type supported by the available access network PDN connection; or, according to the IP address information used by the PDN connection in the source network, the available access network.
- the supported IP protocol stack selects the target network; or, the target network is selected according to the IP address information used by the PDN connection in the source network, the IP protocol stack capability type supported by the available access network PDN connection, and the IP protocol stack supported by the access network.
- the UE 22 performs an access network selection and handover decision (UE makes acces s network select ion and handover dec i s ion ). Specifically:
- the UE 22 selects the target network based on the IP address information used by the PDN connection of the current network (i.e., the source network) of the UE 22 and the IP protocol stack capability type supported by the available access network PDN connection. For example: a) UE 22 uses a dual IP address in a single PDN connection in the source network, and an access network information in the access network information is supported by an access network PDN connection.
- the IP protocol stack capability type is an IP dual stack access network. This access network is the target access network.
- the UE 22 uses a single IP address in a single PDN connection in the source network, and the available access network information has an IP protocol stack type supported by the access network PDN connection, and the UE 22 prefers this connection.
- the incoming network is the target access network.
- the UE 22 selects the target network based on the IP address information used by the PDN connection of the UE 22 in the source network and the IP protocol stack supported by the access network.
- IP address information used by the PDN connection of the UE 22 in the source network and the IP protocol stack supported by the access network.
- the UE 22 uses a dual IP address in a single PDN connection in the source network, and the available IP network protocol stack supported by the access network is an IPv4/IPv6 dual-stack access network, and the UE 22 prefers the access network. Access the network for the target. Or,
- UE 22 uses a dual IP address in a single PDN connection in the source network.
- the available access network information does not exist.
- the IP protocol stack supported by the access network is an IPv4/IPv6 dual-stack access network but there is an IP supported by the access network.
- the protocol stack is an IPv6 access network, and the UE 22 prefers the access network as the target access network.
- UE 22 uses a single IP address for a single PDN connection in the source network, available access network information
- the IP protocol stack supported by the access network is an IPv4/IPv6 dual-stack access network, and the UE 22 prefers the access network as the target access network. or,
- UE 22 uses a single IP address in a single PDN connection in the source network, and the available IP network stack in the available access network information does not exist as an IPv4/IPv6 dual-stack access network, and the UE 22 preferably accesses the network.
- the access network that supports the IP protocol stack and the IP protocol stack currently used by the UE 22 is the target access network.
- the UE 22 selects the target network based on the IP address information used by the PDN connection of the UE 22 in the source network and the IP protocol stack capability type supported by the access network PDN connection and the IP protocol stack supported by the access network.
- the UE 22 uses a dual IP address in a single PDN connection in the source network, and the available access network information has an IP protocol stack type supported by the access network PDN connection, and the UE 22 prefers this connection.
- the incoming network is the target access network.
- UE 22 uses a dual IP address in a single PDN connection in the source network, and there is no access network information in the access network information.
- the IP protocol stack supported by the access network PDN connection is an IP dual stack access network but has access network support.
- the IP protocol stack is an IPv4/IPv6 access network, and the UE 22 prefers the access network as the target access network. Or,
- UE 22 uses a dual IP address in a single PDN connection in the source network, and there is no access network information in the access network information.
- the IP protocol stack type supported by the access network PDN connection is an IP dual stack access network and there is no access network.
- the supported IP protocol stack is an IPv4/IPv6 access network, but the IP protocol stack supported by the access network is an IPv6 access network, and the UE 22 prefers the access network as the target access network.
- UE 22 uses a single IP address in a single PDN connection in the source network.
- the available access network information there is an access network with an IP protocol stack capability type supported by the access network PDN connection, and the UE 22 prefers this connection.
- the incoming network is the target access network.
- UE 22 uses a single IP address for a single PDN connection in the source network, available access network information
- the IP protocol stack of the access network PDN connection is not the access network of the IP dual stack, but the IP protocol stack supported by the access network is the IPv4/IPv6 dual stack access network, and the UE 22 prefers this connection.
- the incoming network is the target access network. or,
- UE 22 uses a single IP address in a single PDN connection in the source network, and there is no access network information in the access network information.
- the IP protocol stack type supported by the access network PDN connection is an IP dual stack access network and there is no access network.
- the supported IP protocol stack is an IPv4/IPv6 access network, but the access network supports an IP protocol stack that is consistent with the IP protocol stack currently used by the UE 22, and the UE 22 prefers the access network as the target access.
- the internet The internet.
- the target access network to be handed over by the UE 22 is decided by the ANDSF network element, the above selection process is performed by the ANDSF network element. At this time, the UE 22 needs to report the IP protocol stack (IPv4 or IPv6 or IPv4/IPv6) currently used by the UE 22 to the ANDSF network element in step 201. After the ANDSF network element decision is executed, the target access network information determined is notified to the UE 22.
- IP protocol stack IPv4 or IPv6 or IPv4/IPv6
- the mobile terminal selects the available access network information from the ANDSF network element, and selects the target network to be switched according to the IP address information and available access network information used in the source network, or the ANDSF network element moves from the mobile terminal.
- the UE uses an IPv6 address in the source network, and the target network sets the IP address request indication information to be IPv4, that is, the target network requires the UE to use the IPv4 address;
- the UE uses an IPv4 address on the source network, and the target network requires the UE to use IPv6.
- the UE uses an IPv4 address and an IPv6 address in the source network, and the target network only requires the UE to use an IPv4 address or an IPv6 address.
- the problem that the target network cannot continue to use the IP address used by the UE in the source network is avoided, and the problem that the mobile terminal uses the service interruption or part of the service interruption in the source network due to the loss of the IP address used by the mobile terminal is avoided. , enabling the mobile terminal to preferentially switch to the same target network as the source network IP address in the available access networks with different capabilities.
- the network ensures that the IP address used by the mobile terminal in the source network can continue to be used in the target network, which greatly improves the user experience of the mobile terminal.
- Step 301 Acquire IP address information used by a user equipment in a source network
- Step 303 Specify IP address information used by the user equipment in the target network according to the IP address information used by the user equipment in the source network.
- Step 305 Send the specified IP address information to the user plane anchor gateway PGW.
- the method may be: sending a PDN connection establishment request to the PGW (the requested message may be a PDN connection request message, a default bearer request message, a proxy binding update message, or a binding update message, and the specific name of the message is not limited in this patent.
- the request carries the IP address request indication information, where the IP address request indication information carries the determined IP address information.
- the PDN connection establishment request may be initiated by the UE 22, or may be initiated by a network side network element such as a mobility management network element.
- the UE When the UE initiates a PDN connection establishment request, when the target network establishes a PD connection established by the UE in the source network, the UE requests a corresponding IP address according to the IP address information used by the UE in the PDN connection in the source network.
- the target network When the UE initiates a PDN connection establishment request, when the target network establishes a PD connection established by the UE in the source network, the UE requests a corresponding IP address according to the IP address information used by the UE in the PDN connection in the source network.
- the UE uses the dual stack in the PDN connection in the source network, and the UE requests the IPv4 and IPv6 addresses in the PDN Connection Reques t message initiated by the UE.
- the PGW continues to use the IPv4 and IPv6 addresses allocated by the UE in the source network.
- the UE uses a single stack in the PDN connection in the source network, then the PDN Connect ion initiated by the UE
- the UE requests an IPv4 or IPv6 address, and the requested IP address type is the same as the IP address type used by the UE to connect to the PDN in the source network.
- the PGW continues to use the IPv4 or IPv6 address allocated by the UE in the source network.
- the UE 22 When the UE 22 initiates a PDN connection setup request, when the target network establishes a PDN connection established by the UE 22 in the source network, the UE 22 according to the IP address information used by the UE 22 in the PDN connection of the source network and the IP supported by the target network PDN connection.
- the protocol stack capability type requests the corresponding IP address. E.g: 1.
- the UE 22 uses the dual stack in the PDN connection in the source network, and the IP protocol stack capability type supported by the target network PDN connection is the IP dual stack.
- the UE 22 requests the IPv4 and the IPv6 address in the PDN Connection Reques t initiated by the UE 22. Accordingly, upon receiving this request, the PGW 14 continues to use the IPv4 and IPv6 addresses assigned by the UE 22 in the source network. or,
- the UE 22 uses a dual stack in the PDN connection in the source network, and the IP protocol stack capability type supported by the target network PDN connection is an IP single stack. Then, the UE 22 initiates two PDNs in the target network for each PDN connection in the source network. In the PDN Connect ion Reques t message, the UE 22 requests an IPv4 address, and in another PDN Connection Reques t message, the UE 22 requests an IPv6 address. Accordingly, the PGW divides the original PDN connection into two PDN connections. The corresponding service data flows are divided into corresponding PDN connections according to the corresponding IP addresses; the UE 22 also divides the corresponding service data flows into corresponding PDN connections according to the corresponding IP addresses. Or,
- the UE uses the single-stack in the PDN connection of the source network, and the UE 22 requests the IPv4 or IPv6 address in the PDN Connection Reques t initiated by the UE 22.
- the requested IP address type is the same as the IP address type used by the UE in the source network.
- the UE 22 When the UE 22 initiates a PDN connection setup request, when the target network establishes a PDN connection established by the UE 22 in the source network, the UE 22 uses the IP address information used by the PDN connection of the UE 22 in the source network, and the IP supported by the target network PDN connection.
- the protocol stack capability type and the IP protocol stack information supported by the target network request the corresponding IP address.
- the UE 22 uses a dual stack in the PDN connection in the source network, and the IP protocol stack capability type supported by the target network PDN connection is IP dual stack and the IP protocol stack supported by the target network is IPv4/IPv6, then the PDN Connec t initiated by the UE 22 The UE 22 requests IPv4 and IPv6 addresses in the ion Reques t. Correspondingly, upon receiving this request, PGW 14 continues to use the IPv4 and IPv6 addresses assigned by UE 22 in the source network. Or,
- the UE uses a dual stack in the source network PDN connection.
- the IP protocol stack capability type supported by the target network PDN connection is IP single stack but the IP protocol stack supported by the target network is IPv4/IPv6, then the UE 22 pairs each of the source networks.
- the PD connection initiates two PDN Connect ion Reques t in the target network. In one PDN Connection Reques t message, the UE 22 requests an IPv4 address, and in another PDN Connection Reques t message, the UE 22 requests an IPv6 address. Accordingly, the PGW divides the original PDN connection into two PDN connections.
- the corresponding service data flows are divided into corresponding PDN connections according to the corresponding IP addresses; the UE 22 also divides the corresponding service data flows into corresponding PDN connections according to the corresponding IP addresses. or,
- the UE 22 uses a dual stack in the PDN connection in the source network, and the IP protocol stack capability supported by the target network PDN connection is IP single stack (or IP dual stack) and the target network only supports IPv4 or IPv6, then the UE 22 pairs the source network.
- Each PDN connection initiates a PDN Connection Reques t, in which the UE 22 requests an IPv4 or IPv6 address and the message indicates that the target network uses only a single stack, and the UE 22 puts another IP address#, and uses this IP address.
- the relevant information (such as the TFT (Traffic Flow Template) used by this address) is deleted.
- the PGW continues to use the IPv4 or IPv6 address allocated by the UE 22 in the source network, releases the other IP address, and releases the information used by the IP address, such as the transport stream template used by the address (TFT) , Traff ic Flow Template.
- TFT transport stream template used by the address
- the UE 22 uses a single stack in the PDN connection in the source network, then the PDN Connec t i on initiated by the UE 22
- UE 22 requests an IPv4 or IPv6 address, and the requested IP address type is the same as the IP address type used by UE 22 in the source network for PDN connection. Accordingly, upon receiving this request, the PGW 14 continues to use the IPv4 or IPv6 address assigned by the UE 22 in the source network.
- the network side network element When the network side network element initiates a PD connection establishment request, when the target network establishes a PDN connection established by the UE 22 in the source network, the network side network element determines an IP address request indication according to the IP address information used by the UE in the source network PDN connection. information. E.g,
- the UE uses the dual stack in the PDN connection of the source network, and the PDN connection establishment procedure initiated by the network side network element requests dual IP addresses (IPv4 and IPv6 addresses;). Correspondingly, after receiving the request, the PGW continues to use the IPv4 and IPv6 addresses allocated by the UE in the source network. Or,
- the UE uses a single stack in the PDN connection of the source network, and the network side network element requests the IPv4 or IPv6 address in the PDN connection establishment procedure initiated by the network side network element (the requested IP address type is related to the UE 22)
- the IP address type used by the PDN connection in the source network is the same) or the network side network element requests a single IP address. Accordingly, upon receiving this request, PGW 14 continues to use the IPv4 or IPv6 address assigned by UE 22 in the source network.
- the network side network element When the network side network element initiates a PDN connection establishment request, when the target network establishes a PDN connection established by the UE 22 in the source network, the network side network element according to the IP address information used by the UE 22 in the PDN connection of the source network and the target network PDN Connect the supported IP protocol stack capability type, set the IP address request indication information in the PDN connection request, and request the corresponding IP address.
- the network side network element When the network side network element initiates a PDN connection establishment request, when the target network establishes a PDN connection established by the UE 22 in the source network, the network side network element according to the IP address information used by the UE 22 in the PDN connection of the source network and the target network PDN Connect the supported IP protocol stack capability type, set the IP address request indication information in the PDN connection request, and request the corresponding IP address.
- the UE uses a dual stack in the PDN connection in the source network, and the IP protocol stack capability type supported by the target network PDN connection is an IP dual stack. Then, the PDN connection establishment procedure initiated by the network side network element requests a dual IP address (IPv4 and IPv6 addresses). ). Correspondingly, after receiving the request, the PGW continues to use the IPv4 and IPv6 addresses allocated by the UE in the source network. Or,
- the UE uses a dual stack in the PDN connection in the source network, and the IP protocol stack capability type supported by the target network PDN connection is an IP single stack. Then, the network side network element initiates a PDN in the target network for each PDN connection in the source network. A connection establishment procedure is established in which the network side network element requests an IPv4 or IPv6 address or the network side network element requests a single IP address. Accordingly, upon receiving this request, the PGW 14 continues to use the IPv4 or IPv6 address assigned by the UE 22 in the source network. When the UE 22 finds that the PDN connection uses only one IP address and the original PDN connection has two IP addresses, the UE 22 initiates another PDN connection establishment procedure, instructing the network side to allocate another IP address. Or,
- the network side network element initiates two PDN connection establishment procedures in the target network for each PDN connection in the source network.
- the network side network element requests an IPv4 address, and another PD connection establishment procedure in the network side
- the NE requests an IPv6 address.
- the PGW divides the original PDN connection into two PD connections.
- the corresponding service data flows are divided into corresponding PDN connections according to the corresponding IP addresses.
- the UE 22 also divides the corresponding service data stream into corresponding PDN connections according to the corresponding IP address. Or,
- the UE 22 uses a single stack in the source network PDN connection, and the PDN connection initiated by the network side network element is established.
- the network side network element requests an IPv4 or IPv6 address (the requested IP address type is the same as the IP address type used by the UE 22 in the PDN connection in the source network) or the network side network element requests a single IP address. Accordingly, upon receiving this request, PGW 14 continues to use the IPv4 or IPv6 address assigned by UE 22 in the source network.
- the network side network element When the network side network element initiates a PD connection establishment request, when the target network establishes a PDN connection established by the UE 22 in the source network, the network side network element uses the IP address information used by the PDN connection of the UE 22 in the source network, and the target network PDN.
- the IP protocol stack capability type information supported by the connection and the IP protocol stack information supported by the target network are connected, and the IP address request indication information is set in the PDN connection request, and the corresponding IP address is requested.
- the UE 22 uses the dual stack in the PDN connection of the source network, and the IP protocol stack type supported by the target network PDN connection is IP dual stack and the IP protocol stack supported by the target network is IPv4/IPv6, and the PDN connection initiated by the network side network element is Request a dual IP address (IPv4 and IPv6 address) in the setup procedure.
- the PGW continues to use the IPv4 and IPv6 addresses allocated by the UE in the source network; or
- the UE 22 uses dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is IP dual stack (or IP single stack), but the IP protocol stack supported by the target network is IPv4 or IPv6, then the network side
- IP protocol stack supported by the target network is IPv4 or IPv6, then the network side
- the PDN connection establishment procedure initiated by the network element requests an IPv4 or IPv6 address, and the requested IP address type is consistent with the IP protocol stack address type supported by the target network.
- the PGW continues to use the IPv4 and IPv6 addresses allocated by the UE in the source network; or
- the UE uses a dual stack in the source network PDN connection.
- the IP protocol stack capability type supported by the target network PDN connection is IP single stack but the IP protocol stack supported by the target network is IPv4/IPv6, and the network side network element is in the source network.
- Each PDN connection initiates a PDN connection establishment procedure in the target network, and the network side network element requests a single IP address (IPv4 or IPv6 address) in the establishment procedure.
- IPv4 or IPv6 address IP address
- the PG continues to use the IPv4 or IPv6 address assigned by the UE in the source network.
- the UE finds that the PDN connection uses only one IP address and two of the original PDN connections in the received accept message. IP address, the UE initiates a PDN connection establishment procedure, instructing the network side to allocate another IP address; or
- the UE uses a dual stack in the source network PDN connection.
- the IP protocol stack capability type supported by the target network PDN connection is IP single stack but the IP protocol stack supported by the target network is IPv4/IPv6, and the network side network element is in the source network.
- Each PDN connection initiates two PDN connection establishment procedures in the target network. In one PDN connection establishment procedure, the network side network element requests an IPv4 address, and in another PDN connection establishment procedure, the network side network element requests an IPv6 address; or
- the UE uses a single stack in the source network PDN connection, and the network side network element requests the IPv4 or IPv6 address in the PDN connection establishment procedure initiated by the network side network element (the requested IP address type is used by the UE 22 in the source network in the PDN connection).
- the IP address type is the same.
- the network side network element requests a single IP address. Accordingly, upon receiving this request, the PGW 14 continues to use the IPv4 or IPv6 address assigned by the UE 22 in the source network.
- the network switching process specifies the IP address information of the mobile terminal, and realizes that the mobile terminal can continue to use the IP address allocated by the mobile terminal in the source network.
- FIG. 5 is a flow chart of an embodiment of the method for processing an IP address in a network handover according to the present invention, where the UE needs to switch from a non-3GPP network to a 3GPP network or a UE to a 3GPP network from a non-3GPP network, and specifically includes the following steps:
- Step 401 The UE accesses in the non-3GPP.
- the Non-3GPP Access network element in this step is an Evolved Packet Data Gateway (EPDG); for the Worldwide Interoperability for Microwave Access (WiMAX) system, this step
- the Non-3GPP Access network element is an Access Service Network Gateway (ASN GW); for a Code Division Multiple Access (CDMA) system, the Non-3GPP Access network element in this step is Access Gateway (AG);
- HRPD High Rate Packet Data
- PDSN Packet Data Service Node
- Step 403 The UE decides to switch to the selected target network, such as the 3GPP network, and initiates handover between the non-3GPP network and the 3GPP network.
- Step 405 The UE 22 sends an attach request (At tach Reques t ) message to the mobility management network element through the access network element of the 3GPP network, requesting handover to the 3GPP network; or the UE 22 needs to switch to the 3GPP network, but the UE 22 is still stationed. Remaining in the non-3GPP network, the UE 22 sends an attach request message to the mobility management network element through the access network element of the non-3GPP network.
- the mobility management network element is the SGSN 19; for the E-UTRAN 17 11 network, the mobility management network element is the MME 12.
- the UE 22 may carry the IP address request indication information in the attach request message, indicating what kind of address information the network side UE 22 needs to acquire. Specifically:
- the UE 22 determines the IP address request indication information based on the IP address information used by the UE 22 in the source network PDN connection.
- the UE 22 uses the dual stack in the PDN connection of the source network, and the UE 22 sets the IP address request indication information to be a dual stack (Dua l Stack), that is, the UE 22 requests the IPv4 address and the IPv6 address;
- the UE 22 uses a single stack in the source network PDN connection, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is the same as the IP address type used by the UE 22 in the source network PDN connection.
- the UE 22 determines the IP address request indication information according to the IP address information used by the UE 22 in the source network PDN connection and the IP protocol stack capability type supported by the target network PDN connection. E.g:
- the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is the IP dual stack, and the UE 22 sets the IP address request indication information to the dual stack, that is, the UE 22 requests the IPv4 address and the IPv6 address; Or,
- the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is a single stack, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6; or The UE 22 uses a single stack in the source network PDN connection, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is consistent with the IP address type used by the UE 22 in the source network.
- the UE 22 determines the IP address request indication information according to the IP address information used by the UE 22 in the source network PDN connection, the IP protocol stack capability type information supported by the target network PDN connection, and the IP protocol stack information supported by the target network.
- the IP protocol stack capability type information supported by the target network PDN connection the IP protocol stack information supported by the target network.
- the UE 22 uses the dual stack in the source network PDN connection, the IP protocol stack capability type supported by the target network PDN connection is IP dual stack, and the IP protocol stack supported by the target network is IPv4/IPv6, and the UE 22 sets the IP address request indication information to double.
- the stack that is, the UE 22 requests the IPv4 address and the IPv6 address; or, the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is the IP dual stack (or IP single stack) but the target network supports If the IP protocol stack is IPv4 or IPv6, the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is consistent with the IP protocol stack address type supported by the target network; or
- the UE 22 uses the dual stack in the PDN connection of the source network, and the IP protocol stack type supported by the target network PDN connection is a single stack, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6; or
- the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is IP single stack but the IP protocol stack supported by the target network is IPv4/IPv6, and the UE 22 sets the IP address request indication information to IPv4. Or IPv6; or,
- the UE 22 uses a single stack in the source network PDN connection, the IP protocol stack supported by the target network is IPv4/IPv6, or the IP protocol stack supported by the target network is IPv4 or IPv6 but the IP protocol stack type supported by the target network and the UE 22 are in the source network.
- the IP address type used in the UE is the same, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is the same as the IP address type used by the UE 22 in the source network.
- the IP address type used in the UE is the same, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is the same as the IP address type used by the UE 22 in the source network.
- the UE 22 uses a single stack on the source network PDN connection, and the IP protocol stack supported by the target network is IPv4. Or IPv6, but the IP protocol stack type supported by the target network is inconsistent with the IP address type used by the UE 22 in the source network, and the UE 22 sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type and the IP supported by the target network.
- the protocol stack type is the same.
- the UE 22 may carry the IP protocol stack type information supported by the target network in the "At tach Reques t" message, or
- the UE 22 If the IP protocol stack type supported by the target network is IPv4 or IPv6, the UE 22 carries the IP protocol stack type information supported by the target network in the "At tach Reques t" message. If the UE 22 does not carry the IP protocol stack type information supported by the target network in the "At tach Reques t" message, the network side considers that the IP protocol stack type information supported by the target network is IPv4/IPv6 by default.
- the IP stack type information supported by the target network can be:
- Network Suppor t IP Address Indicator Cell: If the value of this cell is IPv4, it means that the target network only supports IPv4 address; if the value of this cell is IPv6, it means that the target network only supports IPv6 address; The value of the element is IPv4/IPv6, which means that the target network supports IPv4 addresses and IPv6 addresses.
- Step 407 Perform authentication between the UE 22, the mobility management network element, and the HSS 16
- Step 409 Perform a Location Update and Insert Subscr iber Data process between the mobility management network element and the HSS 16, register the address of the mobility management network element in the HSS 16, and the HSS 16 The subscription data of the UE 22 is inserted into the mobility management network element.
- the HSS 16 sends the PDN connection information used by the UE 22 in the non-3GPP network to the mobility management network element, that is, the mobility management network element obtains the APN and PGW 14 used by the UE 22 in the non-3GPP network. Address information.
- Step 411 If the PDN connection is initiated by the network side network element when the UE 22 switches from the non-3GPP network to the 3GPP network or needs to be handed over, the mobility management network element initiates a PDN connection establishment procedure for each obtained APN and PGW 1 address record. . If the UE 22 initiates a handover from a non-3GPP network to a 3GPP network or requires a handover, the mobility management network element does not initiate a PDN. The connection establishment procedure or the mobility management network element only initiates a procedure for establishing a default PDN connection (ie, a PDN connection corresponding to the default APN).
- the mobility management network element sends a Create Defaul t Bearer Reques t message to the SGW 13, and the message carries the PGW 14 address, APN, and IP address request indication information in the record. If the IP address request indication information is determined by the UE 22, the mobility management network element may obtain the IP address request indication information from the "At tach Reques t" message sent by the UE 22. If the IP address request indication information is determined by the network side (in this embodiment, by the mobility management network element on the network side), the mobility management network element determines that the IP address request indication information may be specifically:
- the mobility management network element determines the IP address request indication information according to the IP address information used by the UE in the source network PDN connection.
- the UE uses the dual stack in the PDN connection of the source network, and the mobility management network element sets the IP address request indication information to dual stack (that is, the UE requests the IPv4 address and the IPv6 address). or,
- the mobility management network element sets the IP address request indication information to IPv4 or IPv6, and the requested IP address type is the same as the IP address type used by the UE 22 in the source network PDN connection.
- the mobility management network element determines the IP address request indication information according to the IP address information used by the UE 22 in the source network PDN connection and the IP protocol stack capability type supported by the target network PDN connection.
- the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is the IP dual stack, and the mobility management network element sets the IP address request indication information to the dual stack (the dual stack, ie, the UE 22 request) IPv4 address and IPv6 address); or,
- the UE 22 uses the dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is a single stack, and the mobility management network element sets the IP address request indication information to be IPv4 or IPv6;
- the UE initiates a PDN connection establishment procedure in the target network for each PDN connection in the source network, and the network side network element requests the IPv4 or IPv6 address in the establishment procedure.
- PGW 14 continues to use IPv4 or IPv6 allocated by UE 22 in the source network. address.
- the UE 22 finds that the PDN connection uses only one IP address and the original PDN connection has two IP addresses in the received accept message, and the UE 22 initiates a PDN connection establishment procedure, instructing the network side to allocate another IP address. or,
- the UE uses a dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is a single stack, and the mobility management network element initiates two PDN connection establishments in the target network for each PDN connection in the source network.
- the network side network element requests the IPv4 address in the PDN connection establishment procedure, and the network side network element requests the IPv6 address in the other PDN connection establishment procedure.
- the UE 22 uses a single stack in the source network PDN connection, and the mobility management network element sets the IP address request indication information to IPv4 or IPv6, and the requested IP address type is the same as the IP address type used by the UE 22 in the source network PDN connection.
- the mobility management network element determines the IP address request according to the IP address information used by the UE 22 in the source network PDN connection, the IP protocol stack capability type information supported by the target network PDN connection, and the IP protocol stack information supported by the target network. Instructions. E.g:
- the UE 22 uses the dual stack in the source network PDN connection, the IP protocol stack capability type supported by the target network PDN connection is the IP dual stack, and the IP protocol stack supported by the target network is IPv4/IPv6, and the mobility management network element sets the IP address request indication.
- the information is dual stack (the dual stack, that is, the UE 22 requests the IPv4 address and the IPv6 address;); or
- the UE 22 uses a dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is an IP dual stack (or IP single stack), but the IP protocol stack supported by the target network is IPv4 or IPv6, then the mobility management network
- the element sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is consistent with the IP protocol stack address type supported by the target network; or
- the UE 22 uses the dual stack in the PDN connection of the source network, and the IP address of the target network PDN connection is a single stack, and the mobility management network element sets the IP address request indication information to IPv4 or IPv6; or
- the management network element sets the IP address request indication information to be IPv4 or IPv6.
- the network side network element initiates a PDN connection establishment procedure in the target network for each PDN connection in the source network, and establishes a network side network element request in the procedure. IPv4 or IPv6 address.
- PGW 1 Upon receipt of this request, PGW 1 continues to use the IPv4 or IPv6 address assigned by UE 22 in the source network.
- the UE 22 finds that the PDN connection uses only one IP address and the original PDN connection has two IP addresses in the received accept message, and the UE 22 initiates a PDN connection establishment procedure, instructing the network side to allocate another IP address.
- the UE 22 uses a dual stack in the source network PDN connection, and the IP protocol stack capability type supported by the target network PDN connection is an IP single stack, but the IP protocol stack supported by the target network is IPv4/IPv6, and the network side network element is in the source network.
- Each PDN connection initiates two PDN connection establishment procedures in the target network. In one PDN connection establishment procedure, the network side network element requests an IPv4 address, and in another PDN connection establishment procedure, the network side network element requests an IPv6 address; or
- the UE 22 uses a single stack in the source network PDN connection, the IP protocol stack supported by the target network is IPv4/IPv6, or the IP protocol stack supported by the target network is IPv4 or IPv6 but the IP protocol stack type supported by the target network and the UE 22 are in the source network. If the type of the IP address used is the same, the mobility management network element sets the IP address request indication information to be IPv4 or IPv6, and the type of the requested IP address is the same as the type of the IP address used by the UE 22 in the source network; or
- the UE 22 uses a single stack in the source network PDN connection, and the IP protocol stack supported by the target network is IPv4 or IPv6, but the IP protocol stack type supported by the target network is inconsistent with the IP address type used by the UE 22 in the source network, then the mobility management network
- the element sets the IP address request indication information to be IPv4 or IPv6, and the requested IP address type is consistent with the IP protocol stack type supported by the target network.
- the mobility management network element may obtain the IP address information used by the UE 22 in the source network PDN connection from the IP address request indication information carried in the message sent by the UE 22, or may obtain the UE 22 in the source network PDN connection from the HSS 16.
- the IP address information used in this mechanism requires the UE 22 to register the IP address information used by the PDN connection to the HSS 16 when the source network establishes a PDN connection.
- the mobility management network element registers the IP address information used by this PDN connection to the HSS 16 when the UE 22 establishes a PDN connection on the 3GPP network; when the UE 22 establishes a PDN connection on the non-3GPP network
- the PG 14 registers the IP address information used by this PDN connection to the HSS 16.
- the registered IP address information can be: IP address indication (IPv4 (established PDN connection uses IPv4 address), IPv6 (established PDN connection uses IPv6 address), IPv4/IPv6 (established PDN connection uses IPv4 and IPv6 address) or For a specific IP address, such that when the UE 22 switches from the non-3GPP network to the 3GPP network or the UE 22 needs to switch from the non-3GPP network to the 3GPP network, the mobility management network element can acquire the UE 22 from the HSS 16 in the non- IP address information used by the PDN connection established in the 3GPP network.
- IPv4 established PDN connection uses IPv4 address
- IPv6 established PDN connection uses IPv6 address
- IPv4/IPv6 established PDN connection uses IPv4 and IPv6 address
- the mobility management network element may carry the IP protocol stack type information supported by the target network in the create default bearer request message.
- the information mobility management network element may be obtained from the At tach Reques t message, or may be a mobility management network element. Obtained according to the target network operator's policy or the capabilities of the target network.
- the mobility management network element may carry the IP protocol stack type information supported by the target network in the Create Default Bearer Request message. If the mobility management network element does not carry the IP protocol stack type information supported by the target network in the Create Default Bearer Request message, the network side considers that the IP protocol stack type information supported by the target network is IPv4/IPv6.
- Step 413 After receiving the foregoing message, the SGW 13 sends a Create Default Bearer Request message (the interface between the SGW 1 3 and the PGW 14 uses the GTP protocol) or a proxy binding update message (the interface between the SGW 1 3 and the PGW 14 is used.
- the PMIP protocol Create Defaul t Bearer Reques t/Proxy BU
- the message carries the APN and IP address request indication information. If the mobility management network element carries the IP protocol stack type information supported by the target network in the create default bearer request message, the SGW 13 carries the information to the PGW 14 in the Create Default Bearer Request message or the proxy binding update message.
- Step 415 After receiving the foregoing message, the PGW 14 locates the PDN connection used by the UE 22 according to the APN, and then the PGW 14 keeps the IP address of the PDN connection unchanged, that is, the PGW 14 continues to use the UE 22 in the non-3GPP for this PDN connection.
- the IP address assigned during the network does not require an IP address to be assigned to this PDN connection.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the PGW 14 receives the creation.
- the IP address request indication information in the default bearer request message or the proxy binding update message is a dual stack, and PGW 1 continues to use the IPv4 and IPv6 addresses used by the UE 22 in the source network PDN connection in this PDN connection establishment.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the PGW 1 receives the IP address request indication information in the Create Default Bearer Request message or the Proxy Binding Update message as IPv4 or IPv6, then the PGW 14 In this PDN connection establishment, the IPv4 or IPv6 address used by the UE 22 in the source network is continuously used, and the IP address type used is the same as the IP address type in the IP address request indication information. At the same time, PGW 1 will continue to reserve another IP address used by UE 22 in the source network.
- the PGW divides the original PDN connection into two PDN connections.
- the corresponding service data stream is divided into corresponding PDN connections according to the corresponding IP address.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the IP address request indication information in the Create Default Bearer Request message or the proxy binding update message received by the PGW 1 is IPv4 or IPv6 and the target network If the supported IP protocol stack is IPv4 or IPv6, the PG 14 continues to use the IPv4 or IPv6 address used by the UE 22 in the source network in this PDN connection establishment, and uses the IP address type and the IP address in the IP address request indication information. consistent with the type of address, while another PGW 14 deletes the IP address of UE 22 for use in the source network, to release the IP address information (e.g., using the address TFT) 0
- the PGW 14 returns a Create Default Bearer Response message or a Create Binding Response/Proxy BA message to the SGW 13, which carries the IP address used by this bearer (or this PDN connection).
- Step 417 The SG 13 back creates a Create Defaul t Bearer Response message to the mobility management network element, where the message carries the IP address used by the bearer (or the PDN connection).
- Step 419 The mobility management network element returns an At tach Accept message to the UE 22, where the message carries an IP address used by the default bearer (or the default PDN connection).
- the mobility management network element may carry the IP protocol stack type information supported by the target network in the attach accept message. Or if The IP protocol stack type supported by the target network is IPv4 or IPv6, and the mobility management network element may carry the IP protocol stack type information supported by the target network in the attach accept message. If the mobility management network element does not carry the IP protocol stack type information supported by the target network in the attach accept message, the UE 22 defaults that the IP protocol stack type information supported by the target network is IPv4/IPv6.
- Step 421 If the PDN connection request (PDN Connec t tive Reques t) is initiated by the UE 22, the UE 22 sends a PDN connection request message to the mobility management network element request for the PDN connection established by the UE 22 in the non-3GPP network.
- the message carries the APN and IP address request indication information used by the PDN connection.
- the UE 22 determines the processing of the IP address request indication information as described in step 405.
- the UE 22 may carry the IP protocol stack type information supported by the target network in the PDN connection request message. Or
- the UE 22 If the IP protocol stack type supported by the target network is IPv4 or IPv6, the UE 22 carries the IP protocol stack type information supported by the target network in the PDN connection request message. If the UE 22 does not carry the IP protocol stack type information supported by the target network in the PD connection request message, the network side considers that the IP protocol stack type information supported by the target network is IPv4/IPv6.
- the UE 22 uses IPv4 and IPv6 addresses on the source network and the target network PDN connection is supported
- the IP protocol stack capability type is an IP single stack, and the UE 22 sends two PDN connection request messages to the mobility management network element to one PDN connection of the source network, and the IP address request indication information in one PDN connection request message is set to IPv4. The IP address request indication information in another PDN connection request message is set to IPv6.
- the PDN connection is initiated by the network side if the UE 22 is in a non-3GPP to 3GPP handover or a handover is required, and the UE 22 finds that the PDN connection established by the network side uses only one IP address and the PD 22 established by the UE 22 in the source network PDN connection is used.
- the two IP addresses the UE 22 initiates a PDN connection establishment procedure, instructing the network side to assign another IP address assigned by the UE 22 in the source network PDN connection to the PDN connection.
- the UE 22 sends a PDN connection request message to the mobility management network element, and the UE 22 sets the IP address request indication information in the message to be IPv6.
- the network side will be the UE 22 on the source network PDN.
- the IPv6 address assigned in the connection is assigned to this PDN connection.
- the JL UE 22 finds that the PDN connection established by the network side uses only one IP address and the network side notifies the UE 22 that the IP protocol stack supported by the target network is Single stack, if the PDN connection established by the UE 22 in the source network PDN connection uses two IP addresses, the UE 22 deletes another IP address allocated in the source network PDN connection, and uses the information of this IP address (such as this) The address used by the TFT) is deleted.
- Step 423 After receiving the foregoing message, the mobility management network element obtains the PGW address corresponding to the APN according to the APN query record carried in the message.
- the mobility management network element sends a Create Defaul t Bearer Reques t message to the SGW 13 to request the PDN connection to be created, and the message carries the PGW address, APN, and IP address request indication information in the record. If the IP address request indication information is determined by the UE 22, the mobility management network element may obtain the IP address request indication information from the PDN Connection Reques t message sent by the UE 22. If the IP address request indication information is determined by the network side (in this embodiment, by the mobility management network element on the network side), the method for determining the IP address request indication information by the mobility management network element is the same as the processing in step 6, and is no longer Narration.
- the mobility management network element may carry the IP protocol stack type information supported by the target network in the Create Default Bearer Request message.
- the information mobility management network element may be obtained from the PDN Connect Information Reques t message, or may be a mobility management network. The element is obtained according to the strategy of the target network operator or the capability of the target network.
- Step 425 to step 429 are the same as steps 413 to 417, and are not mentioned here.
- Step 431 The mobility management network element returns a PDN connection accept message to the UE 22, and the message carries the IP address used by the PDN connection.
- the network switching process specifies the IP address information by the mobile terminal or the mobility management network element, so that the UE can continue to use the IP address allocated by the UE in the non-3GPP network in the 3GPP network.
- FIG. 6 is a method for processing an IP address during network switching according to the present invention, where a 3GPP network is switched to A non-3GPP network or a 3GPP network requires a flow diagram to switch to a non-3GPP network embodiment.
- a Proxy MIP (PMIP) protocol is used between the Non-3GPP Access network element and the PGW.
- the network switching specifically includes:
- Step 501 The UE 22 accesses in the 3GPP.
- the UE 22 decides to switch to the selected target network, such as a non-3GPP network, to initiate a handover between the 3GPP network and the non-3GPP network.
- the selected target network such as a non-3GPP network
- Step 503 The UE 22 switches to the non-3GPP network, performs authentication and authorization through the access network element of the non-3GPP network, or the UE 22 needs to switch to the non-3GPP network, but the UE 22 also resides.
- the UE 22 performs authentication and authentication through the access network element of the 3GPP network.
- the Non-3GPP Access network element is EPDG (Evolved Packet Data Gateway); for the Wimax system, the Non-3GPP Access network element is ASN G (Access Service Network Gateway, Access Service) Network Gateway);
- AGW Access Gateway, Access Gateway).
- the Non-3GPP Access network element obtains the PDN connection information used by the UE 22 in the 3GPP network in this step. That is, the Non-3GPP Access network element obtains the APN and PGW addresses used by the UE 22 in the 3GPP network.
- Step 505 The UE 22 sends a Layer 3 Attach Request message (L3 Attach Request) to the Non-3GPP Access network element through the access network element of the non-3GPP network or the access network element of the 3GPP network.
- L3 Attach Request Layer 3 Attach Request
- the UE 22 may carry the IP address request indication information in the layer 3 attach request message to indicate what kind of address information the network side UE 22 needs to acquire.
- the method for the UE 22 to determine the IP address request indication information is the same as the processing in the embodiment shown in FIG. 5, and details are not described herein again.
- the UE 22 may carry the IP protocol stack type information supported by the target network in the layer 3 attach request message, or
- Step 507 If the IP protocol stack type supported by the target network is IPv4 or IPv6, the UE 22 carries the IP protocol stack type information supported by the target network in the layer 3 attach request message. If the UE 22 does not carry the IP protocol stack type information supported by the target network in the layer 3 attach request message, the network side confirms that the IP protocol stack type information supported by the target network is IPv4/IPv6. Step 507: If the PDN connection establishment procedure of the UE 22 when the 3GPP to the non-3GPP handover or the handover is required is initiated by the network side, then steps 507 and 509 are performed.
- the Non-3GPP Access network element initiates a PDN connection setup procedure for each PDN connection established by the UE 22 in the 3GPP network, and sends a Proxy Bak Update (Proxy BU) message to the PGW 14.
- the message carries the APN and IP address request indication information used by the PDN connection.
- the Non-3GPP Access network element determines the processing of the IP address request indication information and the processing of the PDN connection establishment as in the above-described embodiment of FIG.
- the Non-3GPP Access network element may carry the IP protocol stack type information supported by the target network in the proxy binding update message, or
- the Non-3GPP Acces s network element carries the IP protocol stack type information supported by the target network in the proxy binding update message. If the Non-3GPP Acces s network element does not carry the IP protocol stack type information supported by the target network in the proxy binding update message, the network side confirms that the IP protocol stack type information supported by the target network is IPv4/IPv6.
- the Non-3GPP Access network element obtains the IP protocol stack type supported by the target network according to the policy of the target network operator or the capability of the target network.
- Step 509 After receiving the foregoing message, the PGW 14 locates the PDN connection used by the UE 22 according to the APN, and then the PGW 14 keeps the IP address of the PDN connection unchanged, that is, the PGW 14 continues to use the UE 22 in the 3GPP network for the PDN connection.
- the assigned IP address does not need to be assigned an IP address for this PDN connection.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the IP address request indication information in the proxy binding update message received by the PGW 14 is a dual stack, and the PGW 14 continues to use the UE 22 in this PDN connection establishment. IPv4 and IPv6 addresses used in the source network PDN connection.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the IP address request indication information in the proxy binding update message received by the PGW 1 is IPv4 or IPv6, and the PGW 14 is connected to the PDN this time.
- the IPv4 or IPv6 address used by the UE 22 in the source network PDN connection is continuously used, and the IP address type used and the IP address in the IP address request indication information are used. The address types are the same.
- PGW 1 will continue to reserve another IP address used by UE 22 in the source network.
- the PGW divides the original PDN connection into two PDN connections.
- the corresponding service data flows are divided into corresponding PDN connections according to the corresponding IP addresses.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection, and the IP address request indication information in the proxy binding update message received by the PGW 1 is IPv4 or IPv6 and the IP protocol stack supported by the target network is IPv4.
- IPv6 the PGW 14 continues to use the IPv4 or IPv6 address used by the UE 22 in the source network in this PDN connection establishment, and the IP address type used is the same as the IP address type in the IP address request indication information, and the PGW 14 delete the IP address of the UE 22 further used in the source network, to release the IP address information (e.g., using the address TFT) 0
- the PG 14 returns a Proxy BA message to the Non-3GPP Acces s network element, which carries the IP address used by this bearer (or this PDN connection).
- Step 511 The Non-3GPP Acces s network element returns a layer 3 L3 At tach Accept message to the UE.
- Step 513 If the UE 22 initiates a PDN connection establishment procedure (PDN Connect Representation) when the UE 22 is in the 3GPP to non-3GPP handover or needs to be handed over, the step 513 to the step 513 are performed.
- PDN Connection Establishation PDN Connect Representation
- the UE 22 sends a PDN Connection Request message to the Non-3GPP Access network element via the non-3GPP network or the access network element of the 3GPP network to request the establishment of the PDN connection.
- the message carries the APN and IP address request indication information used by the PDN connection.
- the UE 22 determines the processing of the IP address request indication information as described in the embodiment shown in FIG. 4 above.
- the UE 22 may carry the IP protocol stack type information supported by the target network in the PDN connection request message, or
- the UE 22 If the IP protocol stack type supported by the target network is IPv4 or IPv6, the UE 22 carries the IP protocol stack type information supported by the target network in the PDN connection request message. If the UE 22 does not carry the IP protocol stack type information supported by the target network in the PD connection request message, the network side confirms The IP protocol stack type information supported by the target network is considered to be IPv4/IPv6.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network and the IP protocol stack capability type supported by the target network PDN connection is the IP single stack, the UE 22 sends two PDN connection request messages to the Non-3GPP Access to one PDN connection of the source network.
- the network element, the IP address request indication information in one PDN connection request message is set to IPv4, and the IP address request indication information in another PDN connection request message is set to IPv6.
- the Non-3GPP Acces s network element After receiving the above message, the step 515, the Non-3GPP Acces s network element obtains the PGW address corresponding to the APN according to the APN query record carried in the message.
- the Non-3GPP Acces s network element sends a proxy binding update (Proxy BU) message to the PGW to request the PDN connection to be created.
- the message carries the APN and IP address request indication information.
- the Non-3GPP Access network element determines the processing of the IP address request indication information as in the processing in the embodiment shown in Fig. 4 above.
- the Non-3GPP Acces s network element may carry the IP protocol stack type information supported by the target network in the proxy binding update message. This information may be obtained from the PDN connection request message, or may be Non-3GPP.
- the access NE is obtained according to the policy of the target network operator or the capability of the target network.
- Step 517 can be the same as step 509.
- Step 519 The mobility management network element returns a PDN Connect ivi ty Accept message to the UE 22, and the message carries the IP address used by the PDN connection.
- the PGW obtains the specified IP address information through the layer 3 attach request message or the PDN connection request message, and performs network switching according to the specified IP address information, so that the UE can continue to use the mobile terminal in the non-3GPP network.
- the IP address assigned in the 3GPP network is not limited to the 3GPP network.
- FIG. 7 is a flowchart of another embodiment of a method for processing an IP address in a network handover according to the present invention, in which a UE switches from a 3GPP network to a non-3GPP network or a UE needs to handover from a 3GPP network to a non-3GPP network.
- a dual stack mobile IPv6 (DSMIPv6, Dua l-Stack MIPv6) protocol or a MIPv4 FACoA (MIPv4 Foreign Agent Care-of-Addres s) protocol is used between the UE 22 and the PGW.
- the switching process specifically includes:
- Step 601 The UE 22 accesses in 3GPP. UE 22 switches to the selected target network such as non-3GPP The network initiates a handover between the 3GPP network and the non-3GPP network (UE Initiate HO).
- Step 603 The UE 22 switches to the non-3GPP network, and performs authentication and authorization through the access network element of the non-3GPP network; or the UE 22 needs to switch to the non-3GPP network, but the UE 22 also resides.
- the UE 22 performs authentication and authentication through the access network element of the 3GPP network.
- the Non-3GPP Access network element is an Evolved Packet Data Gateway (EPDG); for the Wimax system, the Non-3GPP Access network element is an Access Service Network Gateway (Access Service Network Gateway, ASN GW);
- ASN GW Access Service Network Gateway
- ASN GW Access Service Network Gateway
- ASN GW Access Service Network Gateway
- the Non-3GPP Access network element obtains the PDN connection information used by the UE 22 in the 3GPP network, that is, the Non-3GPP Access network element obtains the APN and PGW addresses used by the UE 22 in the 3GPP network.
- Step 605 The UE 22 sends a Layer 3 Attach Request (L3 Attach Request) message to the Non-3GPP Access network element through the access network element of the non-3GPP network or the access network element of the 3GPP network.
- L3 Attach Request Layer 3 Attach Request
- Step 607 The Non-3GPP Access network element returns a layer 3 L3 At tach Accept message to the UE 22.
- Step 609 For each PDN connection established by the UE 22 in the 3GPP network, the UE 22 sends a Binding Update message to the PGW 14 request through the access network element of the non-3GPP network or the access network element of the 3GPP network.
- the message carries the APN and IP address request indication information used by the PDN connection.
- the UE 22 determines the processing of the IP address request indication information as described in the embodiment shown in FIG.
- the UE 22 may carry the IP protocol stack type information supported by the target network in the binding update message, or
- the UE 22 If the IP protocol stack type supported by the target network is IPv4 or IPv6, the UE 22 carries the IP protocol stack type information supported by the target network in the binding update message. If the UE 22 does not carry the IP protocol stack type information supported by the target network in the binding update message, the network side confirms that the IP protocol stack type information supported by the target network is IPv4/IPv6.
- the UE 22 uses the IPv4 and IPv6 addresses in the source network PDN connection and the IP protocol stack capability type supported by the target network PDN connection is the IP single stack, the UE 22 sends two binding update messages to one PD connection of the source network PDN connection to The Non-3GPP Acces s network element, the IP address request indication information in one binding update is set to IPv4, and the IP address request indication information in another binding update message is set to IPv6.
- Step 611 After receiving the foregoing message, the PGW 14 locates the PDN connection used by the UE 22 according to the APN, and then the PGW 14 keeps the IP address of the PDN connection unchanged, that is, the PGW 14 continues to use the UE 22 in the 3GPP network for the PDN connection.
- the assigned IP address does not need to be assigned an IP address for this PDN connection. Subsequent processing is the same as in the embodiment shown in FIG.
- the PGW 14 Binding Acknowledge message is sent to the UE 22, and the message carries the IP address used by the PDN connection.
- the non-3GPP gateway obtains the specified IP address information by binding the update message, and performs network handover according to the specified IP address information, so that the UE can continue to use the mobile terminal in the 3GPP network in the non-3GPP network.
- the assigned IP address is the IP address of the specified IP address information.
- Embodiments of the present invention are described in terms of handover between a 3GPP network and a non-3GPP network, but the mechanism of the present invention is equally applicable to handover between 3GPP networks or handover between non-3GPP networks.
- FIG. 8 is a schematic structural diagram of an embodiment of a network selection system according to the present invention, including a user equipment 31, an access network discovery and selection function ANDSF network element 32, and the user equipment 31 obtains available access network information from the ANDSF network element 32, Determining the target network from the available access networks according to the IP address information used by the user equipment 31 in the source network and the available access network information; or reporting the ANDSF network element 32 according to the user equipment 31 Obtaining IP address information of the user equipment 31 in the source network, and selecting a target network from the available access networks according to the IP address information used by the user equipment 31 in the source network and the available access network information. .
- the above network selection method embodiment see the above network selection method embodiment.
- the network selection system accesses the available access network through the user equipment or the ANDSF network element.
- the target network with the same capability as the source network IP address is selected, so that the user equipment implements the optimized selection of the target network, and ensures that the IP address used by the mobile terminal in the source network can continue to be used in the target network.
- FIG. 9 is a schematic structural diagram of an embodiment of a mobile terminal according to the present invention.
- the mobile terminal includes an available access network information acquiring unit 33 and a selecting unit 34, wherein the available access network information acquiring unit 33 is configured to obtain available access network information from the ANDSF network element on the network side, and the available
- the access network information may include an IP protocol stack supported by the access network and/or an IP protocol stack capability type supported by the available access network packet data network PDN connection; the selection unit 34 is based on the IP address information used by the user equipment in the source network.
- the selecting unit 34 may include an IP protocol stack obtaining subunit and a target selecting subunit, and the IP protocol stack obtaining subunit obtains an IP protocol stack supported by the available access network from the available access network information; the target selecting subunit is available according to the The IP protocol stack supported by the access network and the IP address information used by the user equipment in the source network select the target network.
- the selecting unit 34 may include an IP protocol stack capability type obtaining subunit and a target selecting subunit, and the IP protocol stack capability type obtaining subunit obtains an IP protocol stack capability supported by the available access network PDN connection from the available access network information.
- the target selection sub-unit selects the target network according to the IP protocol stack capability type supported by the available access network PDN connection and the IP address information used by the user equipment in the source network.
- the selecting unit 34 may include a protocol stack and a capability type obtaining subunit and a target selecting subunit, and the protocol stack and the capability type obtaining subunit obtain the IP protocol stack capability supported by the available access network PDN connection from the available access network information. a type and an IP protocol stack supported by the available access network; an IP protocol stack capability type supported by the target access subunit according to the available access network PDN connection, an IP protocol stack supported by the available access network, and the user equipment The IP address information used in the source network selects the target network.
- the mobile terminal acquires an available access network by using an available access network information acquiring unit.
- Network information and the selection unit selects the target network according to the available access network information and the IP address information used by the mobile terminal in the source network, so that the mobile terminal can preferentially select the target network with the same source network IP address capability, and ensure The IP address used by the mobile terminal in the source network can continue to be used in the target network.
- IP address processing system of the present invention including an IP address obtaining unit 41, a target IP specifying unit 42 and a designating notification unit 43.
- the IP address obtaining unit 41 is configured to obtain an IP address used by the user equipment in the source network.
- the target IP specifying unit 42 is configured to specify IP address information used by the user equipment in the target network according to the IP address information used by the user equipment in the source network; and the specifying notification unit 43 is configured to send the specified IP address information to the user's face point gateway.
- the IP address obtaining unit 41 may obtain the IP address information used by the user equipment in the source network from the home subscriber server HSS for the mobility management network element in the 3GPP network or the network element in the non-3GPP network.
- the target IP specifying unit 42 may include: a capability type acquiring subunit and a first specifying subunit, where the capability type obtaining subunit is configured to acquire an IP protocol stack capability type supported by the PDN connection of the target network; the first designated subunit is used for Specifying IP address information used by the user equipment in the target network according to the IP address information used by the user equipment in the source network and the IP protocol stack capability type supported by the PDN connection of the target network;
- the method may include: a protocol stack obtaining subunit and a second specifying subunit, the protocol stack obtaining subunit is configured to obtain an IP protocol stack supported by the target network; and the second designated subunit is configured to be in the source network according to the user equipment Using the IP address information and the IP protocol stack supported by the target network, specifying IP address information used by the user equipment in the target network;
- the method may include: a capability type and a protocol stack acquisition subunit, a third designation subunit, a capability type and a protocol stack acquisition subunit, and a capability type acquisition subunit and a protocol stack acquisition subunit, configured to acquire a PDN of the target network. Connecting the supported IP protocol stack capability type and the IP protocol stack supported by the target access network; the third designated subunit is configured to be used according to the user equipment in the source network The IP address information, the IP protocol stack supported by the target network, and the IP protocol stack capability type supported by the PDN connection of the target network, and the IP address information used by the user equipment in the target network.
- the IP address processing system may also include a mobility management network element or a user plane anchor gateway in the source network, and register the IP address information used by the user equipment in the source network to the home subscriber server HSS.
- the IP address processing system specifies the IP address information in the network switching process by the target IP specifying unit, so that the mobile terminal continues to use the IP address allocated by the UE in the source network in the target network.
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Description
网络选择方法及系统、 移动终端、
IP地址処理方法及系统
技术领域
本发明涉及一种网络技术, 尤其涉及一种网络选择方法、 移动终端、 接 入网络发现和选择功能网元设备、 网络切换时 IP地址处理方法及系统。 背景技术
目前, 用户设备(User Equipment, UE )从非第三代合作伙伴计划 Qrd Generation Partnership Project, 3GPP) ?p non-3GPP网络切换 J 3GPP网络 时的网络切换过程,具体包括:
UE在 non-3GPP网络接入。 其中, 对于无线局域网( Wireless Loca 1 Area Network, LAN ) 系统, 该步骤中的 Non- 3GPP Access网元为演进分组数据网 关(EPDG, Evolved Packet Data Gateway);对于微波存取全球互通( Wor ldwide Interoperability for Microwave Access , WiMAX ) 系统, 该步 聚中的 Non-3GPP Access 网元为接入业务网络网关 ( Access Service Network Gateway, ASN GW); 对于码分多址接入 ( Code Division Multiple Access, CDMA)系统,该步骤中的 Non- 3GPP Access网元为接入网关( Access Gateway, AGW); 对于高速分组数据 ( High Rate Packet Data, HRPD ) 网络, 该步骤中 的 Non- 3GPP Access网元为分组数据服务节点 (PDSN, Packet Date Service Node )。
UE发起 non- 3GPP网络到 3GPP网络之间的切换。 通过 3GPP网络的接入 网元发送附着请求 ( Attach Request ) 消息到移动性管理网元; 或者 UE需要 切换到 3GPP网络, 但是 UE还驻留在 non- 3GPP网络, UE通过 non- 3GPP网络 的接入网元发送附着请求消息到移动性管理网元。对于 GSM/EDGE无线接入网 ( GSM/EDGE Radio Access Network, 即 GERAN ) / UMTS陆地无线接入网 ( UMTS Terrestrial Radio Access Network, 即 UTRAN ) 网络来说, 移动性管理网
元为服务通用分组无线业务支持节点 (Serving GPRS Support ing Node , 即 SGSN ); 对于演进的 UMTS陆地无线接入网 ( Evolved UMTS Terres t r ial Radio Acces s Network, 即 E- UTRAN ) 网络来说, 移动性管理网元为 MME ( Mobi 1 i ty Management Ent i ty )。
UE、 移动性管理网元、 归属用户月良务器(Home Subscr iber Service, 即
HSS )之间执行鉴权流程后, 移动性管理网元和 HSS之间执行位置更新和插入 签约数据 ( Update Locat ion and Inser t Subscr iber Data ) 流程。
移动性管理网元对于获得的每个接入点名称 (Acces s Point Name , 即 APN )、 PGW地址记录发起 PDN连接建立程序,即发送创建缺省承载请求( Create Defaul t Bearer Reques t ) 消息, 通过服务网关 ( Serving Gateway )发送给 PG 0 移动性管理网元才艮据目标网络使用的 IP地址类型决定 UE使用的 IP地 址类型, 并将决定的 IP地址类型携带在创建缺省承载请求消息中。 PGW根据 上述消息后定位到这个 UE使用的 PDN连接, PGW根据创建缺省承载请求消息 中携带的 IP地址类型决定为 UE使用的 IP地址。
发明人在实现本发明的过程中, 发现现有技术至少存在以下缺陷: 上述 过程中, UE在目标网络使用什么类型的地址由目标网络来决定, 导致与目标 网络 IP地址能力不同的源网络中的移动终端, 在切换网络时, 无法在目标网 络中使用移动终端在源网络中使用的 IP地址。 同时由于目标网络不知道 UE 在源网络的 PDN连接中使用的 IP地址信息, 从而导致目标网络决定的 IP地 址类型与 UE在源网络中使用的 I P地址类型不符合, 导致在目标网络无法使 用 UE在源网络中使用的 IP地址。 发明内容
本发明实施例提出一种网络选择方法及系统、 移动终端, 以实现 UE优先 选择到和源网络 IP地址能力相同的目标网络, 这样 UE在源网络中使用的 IP 地址在目标网络都能继续使用。
本发明实施例还提出一种网络切换时 IP 地址处理方法及系统, 以实现 UE在目标网络中能够继续使用 UE在源网络中分配的 IP地址。
本发明实施例提供了一种网络选择方法, 包括:
获取可用接入网络信息和用户设备在源网络中使用的 IP地址信息; 根据所述可用接入网络信息和用户设备在源网络中使用的 IP地址信息, 从可用接入网络中选择目标网络。
通过在网络切换前选择目标网络, 实现了用户设备 UE优先选择到和源网 络 IP地址能力相同的目标网络,这样 UE在源网络中使用的 IP地址在目标网 络都能继续使用。
本发明实施例还提供了一种网络切换时 IP地址处理方法, 包括: 获取用户设备在源网络中使用的 I P地址信息;
根据所述用户设备在源网络中使用的 IP地址信息,指定所述用户设备在 目标网络中使用的 I P地址信息;
发送指定的 IP地址信息到用户面锚点网关。
本发明实施例还提供了一种移动终端, 包括:
可用接入网络信息获取单元, 用于从网络侧获取可用接入网络信息; 选择单元,用于根据用户设备在源网络中使用的 IP地址信息以及所述可 用接入网络信息, 从可用接入网络中选择目标网络。
本发明实施例还提供了一种接入网络发现和选择功能网元设备, 包括:
I P地址获取单元, 用于获取用户设备在源网络中使用的 I P地址信息; 选择单元, 用于根据可用接入网络信息以及所述用户设备在源网络中使 用的 I P地址信息, 从可用接入网络中选择目标网络。
本发明实施例还提供了一种网络选择系统, 包括用户设备、 接入网络发 现和选择功能网元, 其中, 所述接入网络发现和选择功能网元用于提供可用 接入网络信息; 所述用户设备用于从所述接入网络发现和选择功能网元获取 可用接入网络信息,并根据所述用户设备在源网络中使用的 IP地址信息以及
所述可用接入网络信息, 从可用接入网络中选择目标网络。
本发明实施例还提供了一种网络选择系统, 包括用户设备、 接入网络发 现和选择功能网元, 其中, 所述用户设备用于上报信息; 所述接入网络发现 和选择功能网元用于根据所述用户设备的上报信息获取所述用户设备在源网 络中的 I P地址信息, 并根据所述用户设备在源网络中使用的 I P地址信息以 及可用接入网络信息, 从所述可用接入网络中选择目标网络。
本发明实施例还提供了一种 IP地址处理系统, 包括:
I P地址获取单元, 用于获取用户设备在源网络中使用的 I P地址信息; 目标 IP指定单元, 用于根据所述用户设备在源网络中使用的 IP地址信 息, 指定所述用户设备在目标网络中使用的 IP地址信息;
指定通知单元, 用于发送指定的 IP地址信息到用户面锚点网关。
上述 I P地址处理实施例 , 网络切换过程通过指定 I P地址信息, 实现了
UE在目标网络中能够继续使用 UE在源网络中分配的 IP地址。
下面通过附图和实施例, 对本发明的技术方案做进一步的详细描述。 附图说明
图 1为本发明实施例所应用的网络系统结构示意图;
图 2为本发明网络选择方法实施例的流程图;
图 3为图 2所示实施例相应的信令流程图;
图 4为本发明网络切换时 IP地址处理方法实施例的流程图;
图 5为本发明网络切换时 IP地址处理方法应用于 UE从 non- 3GPP网络需 要切换到 3GPP网络或者 UE从 non- 3GPP网络切换到 3GPP网络的实施例的流程图; 图 6 为本发明网络切换时 IP 地址处理方法用于 3GPP 网络切换到 non-3GPP网络或者 3GPP网络需要切换到 non- 3GPP网络实施例的流程图; 图 7为本发明网络切换时 IP地址处理方法用于 UE从 3GPP网络切换到 non-3GPP网络或者 UE从 3GPP网络需要切换到 non- 3GPP网络另一实施例的
流程图;
图 8为本发明网络选择系统实施例的结构示意图;
图 9为本发明移动终端实施例的结构示意图;
图 10为本发明 IP地址处理系统实施例的结构示意图。 具体实施方式
图 1 为本发明实施例所应用的网络系统结构示意图, 即演进网络的系统 架构图, 包括演进的 UMTS陆地无线接入网(Evolved UMTS Terrestrial Radio Access Network, E-UTRAN ) 即 E-UTRAN 11、 移动性管理网元 ( Mobility Management Entity, MME)即 MME12、 月良务网关实体( Serving Gateway, SGW) 即 SGW 13、 分组数据网络网关实体 (Packet Data Network Gateway, PGW ) 即 PGW 14、 策略和计费规贝' J功能实体 (Policy and Charging Rule Function, PCRF) 即 PCRF 15、 归属用户服务器 ( Home Subscriber Server, HSS ) 即 HSS 16、 UMTS陆地无线接入网(UMTS Terrestrial Radio Access Network, UTRAN ) 即 UTRAN 17、 GSM/EDGE无线接入网(GSM/EDGE Radio Access Network, GERAN ) 即 GERAN 18、 服务通用分组无线业务支持节点 (Serving GPRS Supporting Node, SGSN) 即 SGSN 19、 非 3GPP IP接入网络 ( on-3GPP IP Access ) 20 及认证、授权与计费 ϋ艮务器( Authentication, Authorization and Accounting Server, AAA Server ) 即 AAA服务器 21。
E-UTRAN 11用于实现所有与演进网络无线有关的功能; 丽 E 12负责控制 面的移动性管理, 包括用户上下文和移动状态管理, 分配用户临时身份标识 等; SGW 13是 3GPP接入网络间的用户面锚点, 终止 E- TURAN 11的接口; PGW 1 是 3GPP接入网络和非 3GPP接入网络之间的用户面锚点, 终止和外部分组 数据网络(Packet Data Network, 即 PDN ) 的接口 (本专利称之为用户面锚 点网关)。 PCRF 15用于策略控制决定和流计费控制功能。 HSS 16用于存储用 户签约信息。
UTRAN 17 及 GERAN 18用于实现所有与现有 GPRS/UMTS网络中无线有关 的功能。 SGSN 19用于实现 GPRS/UMTS 网络中路由转发、 移动性管理、 会话 管理以及用户信息存储等功能。 非 3GPP IP接入网络(Non- 3GPP IP Access ) 20主要是一些非 3GPP组织定义的接入网络, 如无线局域网(WLAN, Wireless Local Area Network ), 微波存耳又全球互通 ( Worldwide Interoperability for Microwave Access , 即 Wimax ), 码分多址接入 ( Code Division Multiple Access , 即 CDMA)等网络。 AAA服务器 21用于对用户设备(User Equipment, UE) 即 UE22执行接入认证、 授权和计费功能。
图 1为本发明网络选择方法实施例的流程图, 图 3为图 2所示实施例相 应的信令流程图, 主要用于说明获取可用接入网络信息的过程, 具体包括: 步骤 201、 获取可用接入网络支持的 IP协议栈, 或者可用接入网络 PDN 连接支持的 IP协议栈能力类型, 或者接入网络支持的 IP协议栈和可用接入 网络 PDN连接支持的 IP协议栈能力类型;
UE 发送接入网络信息请求 ( Access Network Info Request ) 消息到接 入网络发现和选择功能 ( Access Network Discovery and Selection Function, ANDSF ) 网元, 获知 UE 当前所在位置的接入网络的信息。 ANDSF 网元这个功能实体中包含运营商规定的系统间移动性策略规则, UE当前所在 位置的可用接入网络信息等。
ANDSF 网元返回接入网洛信息响应 ( Access Network Info Response ) 消息到 UE 22, 消息中携带 UE 22 当前所在位置的可用接入网络信息和运营 商规定的系统间移动性策略规则。可用接入网络信息包括:接入网络类型(如 E-UTRAN 11网络、 Wimax网络、 CDMA网络等)、 接入网络 PDN连接支持的 IP 协议栈能力类型 ( IP双栈(即一个 PDN连接中可以使用 IPv4地址和 IPv6地 址)、 IP单栈(即一个 PDN连接中只能使用 IPv4地址或者 IPv6地址)) 或者 接入网络支持的 IP协议栈( IPv4或者 IPv6或者 IPv4/IPv6 ) 或者接入网络 PD 连接支持的 IP协议栈能力类型和接入网络支持的 IP协议栈。
步驟 203、 根据源网络中 PDN连接使用的 IP地址信息以及可用接入网络 PDN连接支持的 IP协议栈能力类型选择目标网络; 或者, 根据源网络中 PDN 连接使用的 IP地址信息、 可用接入网络支持的 IP协议栈选择目标网络; 或 者, 根据源网络中 PDN连接使用的 IP地址信息、 可用接入网络 PDN连接支持 的 IP协议栈能力类型以及接入网络支持的 IP协议栈选择目标网络。
UE 22 进行接入网络选择和切换决定 ( UE makes acces s network select ion and handover dec i s ion )。 具体可为:
UE 22根据 UE 22当前网络(即源网络) 的 PDN连接使用的 IP地址信息 以及可用接入网络 PDN连接支持的 IP协议栈能力类型选择目标网络。 例如: a ) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络, 则 UE 22优选这个接入网络为目标接入网絡。 或者,
b) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息 中存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络, 则 UE 22优选这个接入网络为目标接入网络。
或者具体可为:
UE 22根据 UE 22在源网络中的 PDN连接使用的 IP地址信息以及可用接 入网络支持的 I P协议栈选择目标网络。 例如:
a ) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中存在接入网络支持的 IP协议栈为 IPv4/ IPv6双栈的接入网络, 则 UE 22优 选这个接入网络为目标接入网络。 或者,
b) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中不存在接入网络支持的 IP协议栈为 IPv4/IPv6双栈的接入网络但是存在接 入网络支持的 IP协议栈为 IPv6的接入网络, 则 UE 22优选这个接入网络为 目标接入网络。 或者,
c) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息
中存在接入网络支持的 IP协议栈为 IPv4/ IPv6双栈的接入网络, 则 UE 22优 选这个接入网络为目标接入网络。 或者,
d ) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息 中不存在接入网络支持的 IP协议栈为 IPv4/ IPv6双栈的接入网络, 则 UE 22 优选接入网络支持的 IP协议栈与 UE 22当前使用的 IP协议栈一致的接入网 络为目标接入网络。
或者具体可为:
UE 22根据 UE 22在源网络中的 PDN连接使用的 IP地址信息以及可用接 入网络 PDN连接支持的 IP协议栈能力类型和接入网络支持的 IP协议栈选择 目标网络。 例: ¾口:
a ) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中存在接入网絡 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络, 则 UE 22优选这个接入网络为目标接入网络。 或者,
b ) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中不存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络 但是存在接入网络支持的 IP协议栈为 IPv4/ IPv6的接入网络, 则 UE 22优选 这个接入网络为目标接入网络。 或者,
c ) UE 22在源网络中单个 PDN连接使用双 IP地址, 可用接入网络信息 中不存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络 且不存在接入网络支持的 IP协议栈为 IPv4/IPv6的接入网络但是存在接入网 络支持的 IP协议栈为 IPv6的接入网络, 则 UE 22优选这个接入网络为目标 接入网络。 或者,
d) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息 中存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络, 则 UE 22优选这个接入网络为目标接入网络。 或者,
e) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息
中不存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络 但是存在接入网络支持的 IP协议栈为 IPv4/ IPv6双栈的接入网络, 则 UE 22 优选这个接入网络为目标接入网络。 或者,
f ) UE 22在源网络中单个 PDN连接使用单 IP地址, 可用接入网络信息 中不存在接入网络 PDN连接支持的 IP协议栈能力类型为 IP双栈的接入网络 且不存在接入网络支持的 IP协议栈为 IPv4/IPv6的接入网络但是存在接入网 络支持的 IP协议栈与 UE 22当前使用的 IP协议栈一致的接入网络, 则 UE 22 优选这个接入网络为目标接入网络。
需要说明的是: 如果 UE 22将要切换的目标接入网络决定由 ANDSF网元 判决, 则上述的选择处理由 ANDSF网元执行。 这时 UE 22需在步骤 201 中将 UE 22当前使用的 IP协议栈 ( IPv4或者 IPv6或者 IPv4/IPv6 )上报给 ANDSF 网元。 ANDSF网元判决执行后将决定的目标接入网絡信息通知给 UE 22。
本实施例中, 移动终端通过从 ANDSF 网元获取可用接入网络信息, 并根 据本身在源网络中使用的 IP 地址信息及可用接入网络信息选择切换的目标 网络, 或者 ANDSF 网元通过从移动终端上 · ^艮的信息中获取移动终端在源网络 中使用的 IP地址信息, 并根据获取的 IP地址信息及可用接入网络信息选择 切换的目标网络, 使得如下场景:
1、 UE在源网络使用 IPv6地址, 而目标网络设置 IP地址请求指示信息 为 IPv4 , 即目标网络要求 UE使用 IPv4地址;
2、 UE在源网络使用 IPv4地址, 而目标网络要求 UE使用 IPv6;
3、 UE在源网络使用 IPv4地址和 IPv6地址, 而目标网络只要求 UE使用 IPv4地址或者 IPv6地址;
避免了目标网络不能继续使用 UE在源网络中使用的 I P地址的情况发生, 也避免了由于移动终端使用的 IP地址丢失,导致移动终端在源网络中使用的 业务中断或者部分业务中断的问题发生, 使得移动终端在众多能力不同的可 用接入网络中, 实现了优先选择切换到和源网络 IP 地址能力相同的目标网
络, 保证了移动终端在源网络中使用的 IP地址在目标网络都能继续使用, 大 大提高了移动终端的用户体验。
图 4为本发明网络切换时 IP地址处理方法实施例的流程图, 具体包括: 步驟 301、 获取用户设备在源网络中使用的 I P地址信息;
步骤 303、 根据所述用户设备在源网络中使用的 IP地址信息指定所述用 户设备在目标网络中使用的 I P地址信息。
步驟 305、 发送所述指定的 IP地址信息到用户面锚点网关 PGW。 具体可 为: 向所述 PGW发送 PDN连接建立请求 (请求的消息可以为 PDN连接请求消 息、 创建缺省承载请求消息、 代理绑定更新消息或者绑定更新消息, 本专利 不限定具体的消息名称), 所述请求中携带 IP地址请求指示信息, 所述 IP地 址请求指示信息携带所述决定的 IP地址信息。
PDN连接建立请求可由 UE 22发起, 也可由网络侧网元如移动性管理网 元等发起。
当 UE发起 PDN连接建立请求 , 在目标网络建立起 UE在源网络中建立的 PD 连接时, UE根据 UE在源网络中 PDN连接使用的 IP地址信息请求相应的 IP地址。 例如:
1、 UE在源网络中 PDN连接使用双栈, 那么 UE发起的 PDN连接请求( PDN Connect ion Reques t ) 消息中 UE请求 IPv4和 IPv6地址。 相应地, PGW收 到这个请求后, 继续使用 UE在源网络中分配的 IPv4和 IPv6地址。 或者, 2、 UE在源网络中 PDN连接使用单栈, 那么 UE发起的 PDN Connect ion
Reques t中 UE请求 IPv4或者 IPv6地址, 请求的 IP地址类型与 UE在源网络 中 PDN连接使用的 IP地址类型相同。 相应地, PGW收到这个请求后, 继续 使用 UE在源网络中分配的 IPv4或者 IPv6地址。
当 UE 22发起 PDN连接建立请求, 在目标网络建立起 UE 22在源网络中 建立的 PDN连接时, UE 22根据 UE 22在源网络中 PDN连接使用的 IP地址信 息和目标网络 PDN连接支持的 IP协议栈能力类型请求相应的 IP地址。例如:
1、 UE 22在源网络中 PDN连接使用双栈, 目标网络 PDN连接支持的 IP 协议栈能力类型为 IP双栈, 那么 UE 22发起的 PDN Connect ion Reques t 中 UE 22请求 IPv4和 IPv6地址。 相应地, PGW 14收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4和 IPv6地址。 或者,
2、 UE 22在源网络中 PDN连接使用双栈, 目标网络 PDN连接支持的 IP 协议栈能力类型为 IP单栈, 那么 UE 22对源网络中的每个 PDN连接在目标网 络中发起两次 PDN Connect ion Reques t , 一个 PDN Connect ion Reques t 消 息中 UE 22请求 IPv4地址, 另一个 PDN Connect ion Reques t消息中 UE 22 请求 IPv6地址。 相应地, PGW将原 PDN连接分成两个 PDN连接。 相应的业务 数据流根据相应的 IP地址划分到相应的 PDN连接中; UE 22也将相应的业务 数据流根据相应的 IP地址划分到相应的 PDN连接中。 或者,
3、 UE 在源网络 PDN 连接使用单栈, 则 UE 22 发起的 PDN Connect ion Reques t 中 UE 22请求 IPv4或者 IPv6地址, 请求的 IP地址类型与 UE在源 网络中使用的 IP地址类型一致。
当 UE 22发起 PDN连接建立请求, 在目标网络建立起 UE 22在源网络中 建立的 PDN连接时, UE 22根据 UE 22在源网络中 PDN连接使用的 IP地址信 息、 目标网络 PDN连接支持的 IP协议栈能力类型和目标网络支持的 IP协议 栈信息请求相应的 I P地址。 例如:
1、 UE 22在源网络中 PDN连接使用双栈, 目标网络 PDN连接支持的 IP 协议栈能力类型为 IP双栈且目标网络支持的 IP协议栈为 IPv4/IPv6 , 那么 UE 22发起的 PDN Connec t ion Reques t中 UE 22请求 IPv4和 IPv6地址。 相 应地, PGW 14收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4和 IPv6地址。 或者,
2、 UE在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/ IPv6 , 那么 UE 22 对源网络中的每个 PD 连接在目标网络中发起两次 PDN Connect ion Reques t ,
一个 PDN Connect ion Reques t 消息中 UE 22 请求 IPv4 地址, 另一个 PDN Connect ion Reques t消息中 UE 22请求 IPv6地址。 相应地, PGW将原 PDN连 接分成两个 PDN连接。 相应的业务数据流根据相应的 IP地址划分到相应的 PDN连接中; UE 22也将相应的业务数据流根据相应的 IP地址划分到相应的 PDN连接中。 或者,
3、 UE 22在源网络中 PDN连接使用双栈, 目标网络 PDN连接支持的 IP 协议栈能力类型为 IP单栈(或者 IP双栈)且目标网络只支持 IPv4或者 IPv6, 那么 UE 22对源网络中的每个 PDN连接发起一次 PDN Connect ion Reques t , 消息中 UE 22请求 IPv4或者 IPv6地址且消息中指示目标网络只使用单栈, 同时 UE 22将另一个 IP地址#放, 将这个 IP地址使用的相关信息 (如这个 地址使用的 TFT ( Traff ic Flow Template ,传输流模板))删除。相应地, PGW 收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址, 将另一个 IP地址释放, 释放这个 IP地址使用的信息, 如这个地址使用的传 输流模板 ( TFT, Traff ic Flow Template。 或者,
4、 UE 22在源网络中 PDN连接使用单栈,那么 UE 22发起的 PDN Connec t i on
Reques t中 UE 22请求 IPv4或者 IPv6地址, 请求的 IP地址类型与 UE 22在 源网络中 PDN连接使用的 IP地址类型相同。 相应地, PGW 14收到这个请求 后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址。
当网络侧网元发起 PD 连接建立请求 , 在目标网络建立起 UE 22在源网 络中建立的 PDN连接时, 网络侧网元根据 UE在源网络 PDN连接中使用的 I P 地址信息决定 I P地址请求指示信息。 例如,
1、 UE在源网络 PDN连接使用双栈, 则网络侧网元发起的 PDN连接建立 程序中请求双 IP地址( IPv4和 IPv6地址;)。 相应地, PGW收到这个请求后, 继续使用 UE在源网络中分配的 IPv4和 IPv6地址。 或者,
2、 UE在源网络 PDN连接使用单栈, 则网络侧网元发起的 PDN连接建立 程序中网络侧网元请求 IPv4或者 IPv6地址(请求的 IP地址类型与 UE 22在
源网络中 PDN连接使用的 IP地址类型相同) 或者网络侧网元请求单个 IP地 址。 相应地, PGW 14 收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址。
当网络侧网元发起 PDN连接建立请求, 在目标网络建立起 UE 22在源网 络中建立的 PDN连接时, 网络侧网元根据 UE 22在源网络中 PDN连接使用的 IP地址信息和目标网络 PDN连接支持的 IP协议栈能力类型, 在 PDN连接请 求中设置 IP地址请求指示信息, 请求相应的 IP地址。 例如:
1、 UE在源网络中 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议 栈能力类型为 IP双栈, 那么网络侧网元发起的 PDN连接建立程序中请求双 IP地址 ( IPv4和 IPv6地址)。 相应地, PGW收到这个请求后, 继续使用 UE 在源网络中分配的 IPv4和 IPv6地址。 或者,
2、 UE在源网絡中 PDN连接使用双栈, 目标网络 PDN连接支持的 I P协议 栈能力类型为 IP单栈,那么网络侧网元对源网络中的每个 PDN连接在目标网 络中发起一次 PDN连接建立程序,建立程序中网络侧网元请求 IPv4或者 IPv6 地址或者网络侧网元请求单个 IP地址。 相应地, PGW 14收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址。 UE 22在收到接受 消息中发现这个 PDN连接只使用一个 IP地址而原有 PDN连接中有两个 IP地 址,则 UE 22发起另一个 PDN连接建立程序,指示网络侧分配另一个 IP地址。 或者,
3、网络侧网元对源网络中的每个 PDN连接在目标网络中发起两次 PDN连 接建立程序, 一次 PDN连接建立程序中网络侧网元请求 IPv4 地址, 另一次 PD 连接建立程序中网络侧网元请求 IPv6地址。 PGW将原 PDN连接分成两个 PD 连接。 相应的业务数据流根据相应的 IP地址划分到相应的 PDN连接中。 UE 22也将相应的业务数据流根据相应的 IP地址划分到相应的 PDN连接中。 或者,
4、 UE 22在源网络 PDN连接使用单栈, 则网络侧网元发起的 PDN连接建
立程序中网络侧网元请求 IPv4或者 IPv6地址 (请求的 IP地址类型与 UE 22 在源网络中 PDN连接使用的 IP地址类型相同)或者网络侧网元请求单个 IP 地址。 相应地, PGW 14 收到这个请求后, 继续使用 UE 22在源网络中分配 的 IPv4或者 IPv6地址。
当网络侧网元发起 PD 连接建立请求 , 在目标网络建立起 UE 22在源网 络中建立的 PDN连接时, 网络侧网元根据 UE 22在源网络中 PDN连接使用的 IP地址信息、 目标网络 PDN连接支持的 IP协议栈能力类型信息和目标网络 支持的 IP协议栈信息, 在 PDN连接请求中设置 IP地址请求指示信息, 请求 相应的 IP地址。 例如:
1、 UE 22在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 IP协 议栈能力类型为 IP双栈且目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则网络 侧网元发起的 PDN连接建立程序中请求双 IP地址 ( IPv4和 IPv6地址)。 相 应地, PGW收到这个请求后, 继续使用 UE在源网络中分配的 IPv4和 IPv6 地址; 或者,
2、 UE 22在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 IP协 议栈能力类型为 IP双栈(或者 IP单栈)但是目标网络支持的 IP协议栈为 IPv4或者 IPv6,则网络侧网元发起的 PDN连接建立程序中请求 IPv4或者 IPv6 地址, 请求的 IP地址类型与目标网络支持的 IP协议栈地址类型一致。 相应 地, PGW收到这个请求后,继续使用 UE在源网络中分配的 IPv4和 IPv6地址; 或者,
3、 UE在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则网络侧 网元对源网络中的每个 PDN连接在目标网络中发起一次 PDN连接建立程序, 建立程序中网络侧网元请求单个 IP地址( IPv4或者 IPv6地址)。 PG 收到这 个请求后, 继续使用 UE在源网络中分配的 IPv4或者 IPv6地址。 UE在收到 接受消息中发现这个 PDN连接只使用一个 IP地址而原有 PDN连接中有两个
IP地址,则 UE发起一个 PDN连接建立程序,指示网络侧分配另一个 IP地址; 或者,
4、 UE在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/IPv6, 则网络侧 网元对源网络中的每个 PDN连接在目标网络中发起两次 PDN连接建立程序, 一次 PDN连接建立程序中网络侧网元请求 IPv4地址,另一次 PDN连接建立程 序中网络侧网元请求 IPv6地址; 或者,
5、 UE在源网络 PDN连接使用单栈, 则网络侧网元发起的 PDN连接建立 程序中网络侧网元请求 IPv4或者 IPv6地址(请求的 IP地址类型与 UE 22在 源网络中 PDN连接使用的 IP地址类型相同) 或者网络侧网元请求单个 IP地 址。 相应地, PGW 14 收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址。
本实施例中, 网络切换过程通过移动终端指定 IP地址信息, 实现了移动 终端目标网络中能够继续使用移动终端在源网络中分配的 IP地址。
图 5为本发明网络切换时 IP地址处理方法应用于 UE从 non-3GPP网络需 要切换到 3GPP网络或者 UE从 non-3GPP网络切换到 3GPP网络的实施例的流 程图, 具体包括以下步骤:
步骤 401、 UE在 non- 3GPP接入。 其中, 对于 WLAN 系统, 该步骤中的 Non-3GPP Access 网元为演进分组数据网关 ( EPDG, Evolved Packet Data Gateway ); 对于微波存耳又全球互通 ( Worldwide Interoperability for Microwave Access, WiMAX ) 系统, 该步骤中的 Non-3GPP Access网元为接入 业务网络网关 (Access Service Network Gateway, ASN GW ); 对于码分多址 (Code Division Multiple Access, CDMA) 系统, 该步驟中的 Non- 3GPP Access网元为接入网关 (Access Gateway, AG ); 对于高速分组数据 (High Rate Packet Data, HRPD ) 网络, 该步骤中的 Non— 3GPP Access 网元为分组 数据服务节点 (PDSN, Packet Date Service Node )。
步驟 403、 UE决定切换到选择的目标网络如 3GPP网络, 发起 non- 3GPP 网络到 3 GPP网络之间的切换。
步骤 405、 UE 22 通过 3GPP 网络的接入网元发送附着请求 (At tach Reques t ) 消息到移动性管理网元, 请求切换到 3GPP网络; 或者 UE 22需要 切换到 3GPP网络, 但是 UE 22还驻留在 non- 3GPP网络, UE 22通过 non- 3GPP 网络的接入网元发送附着请求消息到移动性管理网元。 对于 GERAN 18/UTRAN 17 网络来说, 移动性管理网元为 SGSN 19; 对于 E- UTRAN 17 11 网络来说, 移动性管理网元为 MME 12。
UE 22在附着请求消息中可以携带 IP地址请求指示信息, 指示网络侧 UE 22需要获取什么样的地址信息。 具体可为:
UE 22根据 UE 22在源网络 PDN连接中使用的 IP地址信息决定 IP地址 请求指示信息。 例如:
UE 22在源网络 PDN连接使用双栈, 则 UE 22设置 IP地址请求指示信息 为双栈 ( Dua l Stack ), 即 UE 22请求 IPv4地址和 IPv6地址;
UE 22在源网络 PDN连接使用单栈, 则 UE 22设置 I P地址请求指示信息 为 IPv4或者 IPv6 , 请求的 IP地址类型与 UE 22在源网络 PDN连接中使用的 IP地址类型相同。
或者具体可为:
UE 22根据 UE 22在源网络 PDN连接中使用的 IP地址信息和目标网络 PDN 连接支持的 IP协议栈能力类型决定 IP地址请求指示信息。 例如:
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP双栈, 则 UE 22设置 IP地址请求指示信息为双栈, 即 UE 22 请求 IPv4地址和 IPv6地址; 或者,
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为单栈, 则 UE 22设置 IP地址请求指示信息为 IPv4或者 IPv6 ; 或 者,
UE 22在源网络 PDN连接使用单栈, 则 UE 22设置 IP地址请求指示信息 为 IPv4或者 IPv6 , 请求的 IP地址类型与 UE 22在源网络中使用的 IP地址 类型一致。
或者具体可为:
UE 22根据 UE 22在源网络 PDN连接中使用的 I P地址信息、 目标网络 PDN 连接支持的 IP协议栈能力类型信息和目标网络支持的 IP协议栈信息决定 IP 地址请求指示信息。 例如:
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP双栈且目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则 UE 22设 置 IP地址请求指示信息为双栈, 即 UE 22请求 IPv4地址和 IPv6地址;或者, UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP双栈(或者 IP单栈)但是目标网络支持的 IP协议栈为 IPv4 或者 IPv6 , 则 UE 22设置 IP地址请求指示信息为 IPv4或者 IPv6 , 请求的 IP地址类型与目标网络支持的 IP协议栈地址类型一致; 或者,
UE 22在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 IP协议栈 能力类型为单栈, 则 UE 22设置 IP地址请求指示信息为 IPv4或者 IPv6 ; 或 者,
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则 UE 22 设置 IP地址请求指示信息为 IPv4或者 IPv6; 或者,
UE 22 在源网络 PDN 连接使用单栈, 目标网络支持的 IP 协议栈为 IPv4/IPv6 , 或者目标网络支持的 IP协议栈为 IPv4或者 IPv6但是目标网络 支持的 IP协议栈类型与 UE 22在源网络中使用的 IP地址类型一致, 则 UE 22 设置 IP地址请求指示信息为 IPv4或者 IPv6 , 请求的 IP地址类型与 UE 22 在源网络中使用的 IP地址类型一致。 或者,
UE 22在源网络 PDN连接使用单栈, 目标网络支持的 IP协议栈为 IPv4
或者 IPv6但是目标网络支持的 IP协议栈类型与 UE 22在源网络中使用的 IP 地址类型不一致, 则 UE 22设置 IP地址请求指示信息为 IPv4或者 IPv6 , 请 求的 IP地址类型与目标网络支持的 IP协议栈类型一致。
UE 22可以在 "At tach Reques t" 消息中携带目标网络支持的 IP协议栈 类型信息, 或者
如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6 , 则 UE 22 以在 "At tach Reques t" 消息中携带目标网络支持的 IP 协议栈类型信息。 如果 UE 22未在 "At tach Reques t" 消息中携带目标网络支持的 IP协议栈类型信 息, 则网络侧缺省认为目标网络支持的 IP协议栈类型信息为 IPv4/IPv6。
目标网络支持的 IP协议栈类型信息可以为:
"Network Suppor t IP Address Indicator" 信元: 如果这个信元的值 为 IPv4 , 则表示目标网络只支持 IPv4地址; 如果这个信元的值为 IPv6 , 则 表示目标网络只支持 IPv6地址; 如果这个信元的值为 IPv4/IPv6 , 则表示目 标网络支持 IPv4地址和 IPv6地址。
步骤 407 、 UE 22、 移动性管理网元、 HSS 16 之间执行鉴权
( Authent icat ion ) 流程。
步骤 409、 移动性管理网元和 HSS 16之间执行位置更新和插入签约数据 ( Update Locat ion and Insert Subscr iber Data ) 流程, 将移动性管理网 元的地址注册到 HSS 16中, 同时 HSS 16将 UE 22的签约数据插入到移动性 管理网元中。 HSS 16在本步骤中将 UE 22在 non- 3GPP网络中使用的 PDN连 接信息下发给移动性管理网元, 即移动性管理网元获得 UE 22在 non- 3GPP网 络中使用的 APN、 PGW 14地址信息。
步驟 411、 如果 UE 22在 non- 3GPP网络到 3GPP网络切换或者需要切换 时 PDN连接由网络侧网元发起, 则移动性管理网元对于每个获得的 APN、 PGW 1 地址记录发起 PDN连接建立程序。 如果 UE 22在 non- 3GPP网络到 3GPP网 络切换或者需要切换时 PDN连接由 UE 22发起,则移动性管理网元不发起 PDN
连接建立程序或者移动性管理网元只发起缺省 PDN连接 (即缺省 APN对应的 PDN连接)建立程序。
移动性管理网元发送创建缺省承载请求 ( Create Defaul t Bearer Reques t ) 消息到 SGW 13, 消息中携带记录中的 PGW 14地址、 APN、 IP地址 请求指示信息。 如果 IP地址请求指示信息由 UE 22决定, 则移动性管理网元 可以从 UE 22发送的 "At tach Reques t" 消息中获取 IP地址请求指示信息。 如果 IP地址请求指示信息由网络侧 (在本实施例中由网络侧的移动性管理网 元) 决定, 则移动性管理网元决定 IP地址请求指示信息具体可为:
移动性管理网元根据 UE在源网络 PDN连接中使用的 IP地址信息决定 IP 地址请求指示信息。 例如,
UE在源网络 PDN连接使用双栈, 则移动性管理网元设置 IP地址请求指 示信息为双栈 ( Dual Stack, 即 UE请求 IPv4地址和 IPv6地址)。 或者,
UE在源网络 PDN连接使用单栈, 则移动性管理网元设置 IP地址请求指 示信息为 IPv4或者 IPv6 , 请求的 IP地址类型与 UE 22在源网络 PDN连接中 使用的 IP地址类型一致。
移动性管理网元根据 UE 22在源网络 PDN连接中使用的 IP地址信息和目 标网络 PDN连接支持的 IP协议栈能力类型, 决定 IP地址请求指示信息。 例 如:
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP 双栈, 则移动性管理网元设置 IP 地址请求指示信息为双栈 ( Dual Stack, 即 UE 22请求 IPv4地址和 IPv6地址); 或者,
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为单栈, 则移动性管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6; 这种场景下网络侧网元对源网络中的每个 PDN连接在目标网络中发起 一次 PDN连接建立程序, 建立程序中网络侧网元请求 IPv4或者 IPv6地址。 PGW 14收到这个请求后, 继续使用 UE 22在源网络中分配的 IPv4或者 IPv6
地址。 UE 22在收到接受消息中发现这个 PDN连接只使用一个 IP地址而原有 PDN连接中有两个 IP地址, 则 UE 22发起一个 PDN连接建立程序, 指示网络 侧分配另一个 IP地址。 或者,
UE在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 IP协议栈能 力类型为单栈, 则移动性管理网元对源网络中的每个 PDN连接在目标网络中 发起两次 PDN连接建立程序, 一次 PDN连接建立程序中网络侧网元请求 IPv4 地址, 另一次 PDN连接建立程序中网络侧网元请求 IPv6地址。 或者,
UE 22在源网络 PDN连接使用单栈, 则移动性管理网元设置 IP地址请求 指示信息为 IPv4或者 IPv6 , 请求的 IP地址类型与 UE 22在源网络 PDN连接 中使用的 IP地址类型一致。
或者具体可为: 移动性管理网元根据 UE 22在源网络 PDN连接中使用的 IP地址信息、 目标网络 PDN连接支持的 IP协议栈能力类型信息和目标网络 支持的 IP协议栈信息决定 IP地址请求指示信息。 例如:
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP双栈且目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则移动性管 理网元设置 IP地址请求指示信息为双栈 ( Dual Stack, 即 UE 22请求 IPv4 地址和 IPv6地址;); 或者,
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP双栈(或者 IP单栈)但是目标网络支持的 IP协议栈为 IPv4 或者 IPv6, 则移动性管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6, 请求的 IP地址类型与目标网络支持的 IP协议栈地址类型一致; 或者
UE 22在源网络 PDN连接使用双栈 , 目标网络 PDN连接支持的 I P协议栈 能力类型为单栈, 则移动性管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6; 或者,
UE 22在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则移动性
管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6; 这种场景下网络侧网 元对源网络中的每个 PDN连接在目标网络中发起一次 PDN连接建立程序, 建 立程序中网络侧网元请求 IPv4或者 IPv6地址。 PGW 1 收到这个请求后, 继 续使用 UE 22在源网络中分配的 IPv4或者 IPv6地址。 UE 22在收到接受消 息中发现这个 PDN连接只使用一个 IP地址而原有 PDN连接中有两个 IP地址, 则 UE 22发起一个 PDN连接建立程序,指示网络侧分配另一个 IP地址。或者, UE 22在源网络 PDN连接使用双栈, 目标网络 PDN连接支持的 I P协议栈 能力类型为 IP单栈但是目标网络支持的 IP协议栈为 IPv4/ IPv6 , 则网络侧 网元对源网络中的每个 PDN连接在目标网络中发起两次 PDN连接建立程序, 一次 PDN连接建立程序中网络侧网元请求 IPv4地址,另一次 PDN连接建立程 序中网络侧网元请求 IPv6地址; 或者,
UE 22 在源网络 PDN 连接使用单栈, 目标网络支持的 IP 协议栈为 IPv4/IPv6 , 或者目标网络支持的 IP协议栈为 IPv4或者 IPv6但是目标网络 支持的 IP协议栈类型与 UE 22在源网络中使用的 IP地址类型一致, 则移动 性管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6 , 请求的 IP地址类 型与 UE 22在源网络中使用的 IP地址类型一致; 或者,
UE 22在源网络 PDN连接使用单栈, 目标网络支持的 IP协议栈为 IPv4 或者 IPv6但是目标网络支持的 IP协议栈类型与 UE 22在源网络中使用的 IP 地址类型不一致, 则移动性管理网元设置 IP地址请求指示信息为 IPv4或者 IPv6 , 请求的 IP地址类型与目标网络支持的 IP协议栈类型一致。
移动性管理网元可以从 UE 22发送的消息中携带的 IP地址请求指示信息 中获取 UE 22在源网络 PDN连接中使用的 IP地址信息, 也可以从 HSS 16中 获取 UE 22在源网络 PDN连接中使用的 IP地址信息, 这种机制下需要 UE 22 在源网络建立 PDN连接时将这个 PDN连接使用的 IP地址信息注册到 HSS 16 中。 当 UE 22在 3GPP网络建立 PDN连接时移动性管理网元将这个 PDN连接使 用的 IP地址信息注册到 HSS 16; 当 UE 22在 non- 3GPP网络建立 PDN连接时
PG 14将这个 PDN连接使用的 IP地址信息注册到 HSS 16。 注册的 IP地址信 息可以为: IP地址指示为( IPv4 (建立的 PDN连接使用 IPv4地址)、 IPv6 (建 立的 PDN连接使用 IPv6地址)、 IPv4/ IPv6(建立的 PDN连接使用 IPv4和 IPv6 地址 )或者为具体的 IP地址。 这样当 UE 22从 non- 3GPP网络切换到 3GPP网 络或者 UE 22需要从 non-3GPP网络切换到 3GPP网络时移动性管理网元就可 以从 HSS 16中获取 UE 22在 non- 3GPP网络中建立的 PDN连接使用的 IP地址 信息。
移动性管理网元可以在创建缺省承载请求消息中携带目标网络支持的 IP 协议栈类型信息, 这个信息移动性管理网元可以从 At tach Reques t消息中获 取, 也有可能是移动性管理网元根据目标网络运营商的策略或者目标网络的 能力来获取。 或者, 如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6 , 则移动性管理网元可以在创建缺省承载请求消息中携带目标网络支持的 I P 协议栈类型信息。 如果移动性管理网元未在创建缺省承载请求消息中携带目 标网络支持的 IP协议栈类型信息, 则网络侧缺省认为目标网络支持的 IP协 议栈类型信息为 IPv4/ IPv6。
步骤 413、 SGW 1 3收到上述消息后, 发送创建缺省承载请求消息( SGW 1 3 和 PGW 14之间接口使用 GTP协议 )或者代理绑定更新消息 ( SGW 1 3和 PGW 14 之间接口使用 PMIP协议)(Create Defaul t Bearer Reques t/Proxy BU ) 到 PGW 14 , 消息中携带 APN、 IP地址请求指示信息。 如果移动性管理网元在创 建缺省承载请求消息中携带目标网络支持的 IP协议栈类型信息, 则 SGW 13 在创建缺省承载请求消息或者代理绑定更新消息携带这个信息到 PGW 14。
步骤 415、 PGW 14收到上述消息后根据 APN定位到这个 UE 22使用的 PDN 连接, 则 PGW 14保留这个 PDN连接的 IP地址不变, 即 PGW 14对于这个 PDN 连接继续使用 UE 22在 non- 3GPP网络时分配的 IP地址而不需要为这个 PDN 连接分配 IP地址。 具体可为:
UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 14收到的创建
缺省承载请求消息或者代理绑定更新消息中的 IP地址请求指示信息为双栈, 则 PGW 1 在这次的 PDN连接建立中继续使用 UE 22在源网络 PDN连接中使用 的 IPv4和 IPv6地址。
或者具体可为: UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 1 收到的创建缺省承载请求消息或者代理绑定更新消息中的 IP地址请求指 示信息为 IPv4或者 IPv6 ,则 PGW 14在这次的 PDN连接建立中继续使用 UE 22 在源网络中使用的 IPv4或者 IPv6地址, 使用的 IP地址类型与 IP地址请求 指示信息中的 IP地址类型一致。 同时 PGW 1 将继续保留 UE 22在源网络中 使用的另一个 IP地址。 PGW将原 PDN连接分成两个 PDN连接。 相应的业务数 据流根据相应的 IP地址划分到相应的 PDN连接中。
或者具体可为: UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 1 收到的创建缺省承载请求消息或者代理绑定更新消息中的 IP地址请求指 示信息为 IPv4或者 IPv6且目标网络支持的 IP协议栈为 IPv4或者 IPv6 , 则 PG 14在这次的 PDN连接建立中继续使用 UE 22在源网络中使用的 IPv4或 者 IPv6地址, 使用的 IP地址类型与 IP地址请求指示信息中的 IP地址类型 一致, 同时 PGW 14将删除 UE 22在源网络中使用的另一个 IP地址, 释放这 个 IP地址使用的信息 (如这个地址使用的 TFT )0
PGW 14 返回创建缺省承载响应消息或者代理绑定确认消息 (Create Defaul t Bearer Response/Proxy BA )到 SGW 13 , 消息中携带这个承载 (或 者这个 PDN连接 )使用的 IP地址。
步骤 417、 SG 13 回创建缺省承载响应 ( Create Defaul t Bearer Response ) 消息到移动性管理网元, 消息中携带这个承载 (或者这个 PDN连 接)使用的 IP地址。
步骤 419、移动性管理网元返回附着接受 ( At tach Accept )消息到 UE 22 , 消息中携带缺省承载(或者缺省 PDN连接 )使用的 I P地址。 移动性管理网元 可以在附着接受消息中携带目标网络支持的 IP协议栈类型信息。 或者, 如果
目标网络支持的 IP协议栈类型为 IPv4或者 IPv6 , 则移动性管理网元可以在 附着接受消息中携带目标网络支持的 IP协议栈类型信息。如果移动性管理网 元未在附着接受消息中携带目标网络支持的 IP协议栈类型信息, 则 UE 22缺 省认为目标网络支持的 IP协议栈类型信息为 IPv4/ IPv6。
步骤 421、如果由 UE 22发起 PDN连接请求( PDN Connec t ivi ty Reques t ), 则对于 UE 22在 non-3GPP网络中建立的 PDN连接, UE 22发送 PDN连接请求 消息到移动性管理网元请求 PDN连接的建立。消息中携带 PDN连接使用的 APN、 IP地址请求指示信息。 UE 22决定 IP地址请求指示信息的处理参见步骤 405 中的描述。 UE 22可以在 PDN连接请求消息中携带目标网络支持的 IP协议栈 类型信息。 或者
如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6 ,则 UE 22以在 PDN 连接请求消息中携带目标网络支持的 IP协议栈类型信息。 如果 UE 22 未在 PD 连接请求消息中携带目标网络支持的 IP协议栈类型信息, 则网络侧缺省 认为目标网络支持的 IP协议栈类型信息为 IPv4/ IPv6。
如果 UE 22在源网络使用 IPv4和 IPv6地址而目标网络 PDN连接支持的
IP协议栈能力类型为 IP单栈, 则 UE 22对源网络的一个 PDN连接发送两个 PDN连接请求消息到移动性管理网元, 一个 PDN连接请求消息中的 IP地址请 求指示信息设置为 IPv4 , 另一个 PDN连接请求消息中的 IP地址请求指示信 息设置为 IPv6。
如果 UE 22在 non- 3GPP到 3GPP切换或者需要切换时 PDN连接由网络侧 发起, 且 UE 22发现网络侧建立的 PDN连接只使用一个 IP地址而 UE 22在源 网络 PDN连接中建立的 PD 连接使用两个 IP地址, 则 UE 22发起 PDN连接建 立程序, 指示网络侧将 UE 22在源网络 PDN连接中分配的另一个 IP地址分配 给这个 PDN连接。 如网络侧发起的 PDN连接建立程序中建立的 PDN连接使用 IPv4地址, 则 UE 22发送 PDN连接请求消息到移动性管理网元, UE 22设置 消息中的 IP地址请求指示信息为 IPv6。 这样网络侧将 UE 22在源网络 PDN
连接中分配的 IPv6地址分配给这个 PDN连接。
如果 UE 22在 non- 3GPP到 3GPP切换或者需要切换时 PDN连接由网络侧 发起, JL UE 22发现网络侧建立的 PDN连接只使用一个 I P地址而且网络侧通 知 UE 22 目标网络支持的 IP协议栈为单栈, 如果 UE 22在源网络 PDN连接中 建立的 PDN连接使用两个 I P地址 , 则 UE 22将在源网络 PDN连接中分配的另 一个 IP地址删除, 将这个 IP地址使用的信息 (如这个地址使用的 TFT )删 除。
步骤 423、 移动性管理网元收到上述消息后, 根据消息中携带的 APN查 询记录, 获取 APN对应的 PGW地址。 移动性管理网元发送创建缺省承载请求 ( Create Defaul t Bearer Reques t ) 消息到 SGW 13请求 PDN连接创建, 消 息中携带记录中的 PGW地址、 APN、 IP地址请求指示信息。 如果 IP地址请求 指示信息由 UE 22 决定, 则移动性管理网元可以从 UE 22 发送的 PDN Connect ion Reques t消息中获取 IP地址请求指示信息。 如果 IP地址请求指 示信息由网络侧 (在本实施例中由网络侧的移动性管理网元) 决定, 移动性 管理网元决定 IP地址请求指示信息的方法同步骤 6中的处理,这里不再赘述。
移动性管理网元可以在创建缺省承载请求消息中携带目标网络支持的 IP 协议栈类型信息, 这个信息移动性管理网元可以从 PDN Connect ion Reques t 消息中获取, 也有可能是移动性管理网元根据目标网络运营商的策略或者目 标网络的能力来获取。
步驟 425至步骤 429同步骤 413至步骤 417的处理, 这里不再赞述。 步骤 431、 移动性管理网元回 PDN连接接受消息到 UE 22 , 消息中携带这 个 PDN连接使用的 IP地址。
本实施例中, 网络切换过程通过移动终端或移动性管理网元指定 IP地址 信息, 实现了 UE在 3GPP网络中能够继续使用 UE在 non-3GPP网络中分配的 IP地址。
图 6 为本发明网络切换时 IP 地址处理方法用于 3GPP 网络切换到
non-3GPP网络或者 3GPP网络需要切换到 non- 3GPP网络实施例的流程图。 本 实施例中, Non- 3GPP Access网元和 PGW之间使用代理移动 IP (Proxy MIP, 即 PMIP)协议, 网络切换具体包括:
步驟 501、 UE 22 在 3GPP接入。 UE 22 决定切换到选择的目标网络如 non-3GPP网络, 发起 3GPP网络到 non- 3GPP网络之间的切换。
步骤 503、 UE 22切换到 non- 3GPP网络, 通过 non-3GPP网络的接入网元 执行筌权和认证 ( Authentication & Authorization); 或者 UE 22需要切换 到 non- 3GPP网络, 但是 UE 22还驻留在 3GPP网络, UE 22通过 3GPP网络的 接入网元执行鉴权和认证。对于 WLAN系统来说, Non- 3GPP Access网元为 EPDG (演进分组数据网关, Evolved Packet Data Gateway ); 对于 Wimax 系统来 说, Non-3GPP Access 网元为 ASN G (接入业务网络网关, Access Service Network Gateway); 对于 CDMA系统来说, Non-3GPP Access 网元为 AGW (接 入网关, Access Gateway )„ Non-3GPP Access 网元在这个步骤中获取 UE 22 在 3GPP网络中使用的 PDN连接信息, 即 Non- 3GPP Access网元获得 UE 22在 3GPP网络中使用的 APN、 PGW地址。
步骤 505、 UE 22通过 non- 3GPP网络的接入网元或者 3GPP网络的接入网 元发送层 3附着请求消息 (L3 Attach Request )到 Non- 3GPP Access网元。
UE 22在层 3附着请求消息中可以携带 IP地址请求指示信息指示网络侧 UE 22需要获取什么样的地址信息。 UE 22决定 IP地址请求指示信息的方法 同图 5所示实施例中的处理, 这里不再赘述。
UE 22可以在层 3附着请求消息中携带目标网络支持的 IP协议栈类型信 息, 或者
如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6, 则 UE 22以在层 3附着请求消息中携带目标网络支持的 IP协议栈类型信息。 如果 UE 22未在 层 3附着请求消息中携带目标网络支持的 IP协议栈类型信息,则网络侧确认 认为目标网络支持的 IP协议栈类型信息为 IPv4/IPv6。
步驟 507、 如果 UE 22在 3GPP到 non- 3GPP切换或者需要切换时的 PDN 连接建立程序由网络侧发起,则步驟 507、步骤 509被执行。 Non-3GPP Access 网元对于 UE 22在 3GPP网络中建立的每个 PDN连接发起 PDN连接建立程序, 发送代理绑定更新 ( Proxy BU ) 消息到 PGW 14。 消息中携带 PDN连接使用的 APN、 IP地址请求指示信息。 Non- 3GPP Access 网元决定 IP地址请求指示信 息的处理以及 PDN连接建立的处理同上述图 5所示实施例中的处理。
Non-3GPP Access 网元可以在代理绑定更新消息中携带目标网络支持的 IP协议栈类型信息, 或者
如果目标网络支持的 IP 协议栈类型为 IPv4 或者 IPv6 , 则 Non- 3GPP Acces s 网元以在代理绑定更新消息中携带目标网络支持的 IP协议栈类型信 息。 如果 Non- 3GPP Acces s 网元未在代理绑定更新消息中携带目标网络支持 的 IP协议栈类型信息, 则网絡侧确认认为目标网络支持的 IP协议栈类型信 息为 IPv4/IPv6。
Non- 3GPP Access 网元根据目标网络运营商的策略或者目标网络的能力 来获取目标网络支持的 IP协议栈类型。
步骤 509、 PGW 14收到上述消息后根据 APN定位到这个 UE 22使用的 PDN 连接, 则 PGW 14保留这个 PDN连接的 IP地址不变, 即 PGW 14对于这个 PDN 连接继续使用 UE 22在 3GPP网络时分配的 IP地址而不需要为这个 PDN连接 分配 IP地址。 具体可为:
UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 14收到的代理 绑定更新消息中的 IP地址请求指示信息为双栈, 则 PGW 14在这次的 PDN连 接建立中继续使用 UE 22在源网络 PDN连接中使用的 IPv4和 IPv6地址。
或者具体可为: UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 1 收到的代理绑定更新消息中的 IP地址请求指示信息为 IPv4或者 IPv6 ,则 PGW 14在这次的 PDN连接建立中继续使用 UE 22在源网络 PDN连接中使用的 IPv4或者 IPv6地址, 使用的 IP地址类型与 IP地址请求指示信息中的 IP地
址类型一致。 同时 PGW 1 将继续保留 UE 22在源网络中使用的另一个 IP地 址。 PGW将原 PDN连接分成两个 PDN连接。 相应的业务数据流根据相应的 IP 地址划分到相应的 PDN连接中。
或者具体可为: UE 22在源网络 PDN连接中使用 IPv4和 IPv6地址, PGW 1 收到的代理绑定更新消息中的 IP地址请求指示信息为 IPv4或者 IPv6且 目标网络支持的 IP协议栈为 IPv4或者 IPv6 , 则 PGW 14在这次的 PDN连接 建立中继续使用 UE 22在源网络中使用的 IPv4或者 IPv6地址, 使用的 IP地 址类型与 IP地址请求指示信息中的 IP地址类型一致, 同时 PGW 14将删除 UE 22在源网络中使用的另一个 IP地址, 释放这个 IP地址使用的信息 (如 这个地址使用的 TFT )0
PG 14返回代理绑定确认 ( Proxy BA ) 消息到 Non- 3GPP Acces s网元, 消息中携带这个承载 (或者这个 PDN连接)使用的 IP地址。
步骤 511、 Non- 3GPP Acces s网元返回层 3附着接受 ( L3 At tach Accept ) 消息到 UE。
步骤 513、 如果 UE 22在 3GPP到 non- 3GPP切换或者需要切换时的 PDN 连接建立程序 (PDN Connect ivi ty Reques t ) 由 UE 22发起, 则步骤 513至 步骤 513被执行。 对于 UE 22在 3GPP网络中建立的每个 PDN连接, UE 22通 过 non-3GPP 网络或者 3GPP 网络的接入网元发送 PDN 连接请求消息到 Non-3GPP Access网元请求 PDN连接的建立。消息中携带 PDN连接使用的 APN、 IP地址请求指示信息。 UE 22决定 IP地址请求指示信息的处理参见上述图 4 所示实施例中的描述。
UE 22可以在 PDN连接请求消息中携带目标网络支持的 IP协议栈类型信 息, 或者
如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6 ,则 UE 22以在 PDN 连接请求消息中携带目标网络支持的 IP协议栈类型信息。 如果 UE 22 未在 PD 连接请求消息中携带目标网络支持的 IP协议栈类型信息, 则网络侧确认
认为目标网络支持的 IP协议栈类型信息为 IPv4/ IPv6。
如果 UE 22在源网络使用 IPv4和 IPv6地址而目标网络 PDN连接支持的 IP协议栈能力类型为 IP单栈, 则 UE 22对源网络的一个 PDN连接发送两个 PDN连接请求消息到 Non- 3GPP Access 网元, 一个 PDN连接请求消息中的 IP 地址请求指示信息设置为 IPv4 , 另一个 PDN连接请求消息中的 IP地址请求 指示信息设置为 IPv6。
步聚 515、 Non-3GPP Acces s 网元收到上述消息后, 根据消息中携带的 APN查询记录, 获取 APN对应的 PGW地址。 Non- 3GPP Acces s网元发送代理绑 定更新 (Proxy BU ) 消息到 PGW请求 PDN连接创建, 消息中携带 APN、 IP地 址请求指示信息。 Non- 3GPP Access网元决定 IP地址请求指示信息的处理同 上述图 4所示实施例中的处理。 Non- 3GPP Acces s 网元可以在代理绑定更新 消息中携带目标网络支持的 IP协议栈类型信息, 这个信息 Non-3GPP Acces s 网元可以从 PDN连接请求消息中获取, 也有可能是 Non- 3GPP Access 网元根 据目标网络运营商的策略或者目标网络的能力来获取。
步骤 517可同步骤 509的处理。
步骤 519、 移动性管理网元回 PDN连接接受 ( PDN Connect ivi ty Accept ) 消息到 UE 22, 消息中携带这个 PDN连接使用的 I P地址。
本实施例中, PGW通过层 3附着请求消息或 PDN连接请求消息获取指定 的 IP 地址信息, 并根据指定的 IP 地址信息进行网络切换, 实现了 UE 在 non-3GPP网络中能够继续使用移动终端在 3GPP网络中分配的 IP地址。
图 7为本发明网络切换时 IP地址处理方法用于 UE从 3GPP网络切换到 non-3GPP网络或者 UE从 3GPP网络需要切换到 non-3GPP网络另一实施例的 流程图。 本实施例中, UE 22 和 PGW 之间使用双栈移动 IPv6 ( DSMIPv6 , Dua l-Stack MIPv6)协议或者 MIPv4 FACoA (移动 IPv4外部代理转发地址, MIPv4 Foreign Agent Care-of-Addres s )协议。 切换过程具体包括:
步骤 601、 UE 22在 3GPP接入。 UE 22切换到选择的目标网络如 non-3GPP
网络, 发起 3GPP网络到 non- 3GPP网络之间的切换( UE Initiate HO )。
步骤 603、 UE 22切换到 non- 3GPP网络, 通过 non- 3GPP网络的接入网元 执行答权和认证 ( Authentication & Authorization); 或者 UE 22需要切换 到 non- 3GPP网络, 但是 UE 22还驻留在 3GPP网络, UE 22通过 3GPP网络的 接入网元执行鉴权和认证。 对于 WLAN系统来说, Non- 3GPP Access网元为演 进分组数据网关 ( Evolved Packet Data Gateway, EPDG ); 对于 Wimax 系统 来说, Non-3GPP Access网元为接入业务网络网关 (Access Service Network Gateway, ASN GW ); 对于 CDMA系统来说, Non-3GPP Access网元为接入网关 (Access Gateway, AGW)。 Non-3GPP Access 网元在这个步骤中获取 UE 22 在 3GPP网络中使用的 PDN连接信息, 即 Non- 3GPP Access网元获得 UE 22在 3GPP网络中使用的 APN、 PGW地址。
步骤 605、 UE 22通过 non- 3GPP网絡的接入网元或者 3GPP网络的接入网 元发送层 3附着请求 (L3 Attach Request ) 消息到 Non- 3GPP Access网元。
步驟 607、 Non- 3GPP Access网元返回层 3附着接受 ( L3 At tach Accept ) 消息到 UE 22。
步骤 609、 对于 UE 22在 3GPP网络中建立的每个 PDN连接, UE 22通过 non-3GPP网络的接入网元或者 3GPP网络的接入网元发送绑定更新(Binding Update) 消息到 PGW 14请求 PDN连接的建立。 消息中携带 PDN连接使用的 APN、 IP地址请求指示信息。 UE 22决定 IP地址请求指示信息的处理参见图 4所示实施例中的描述。
UE 22可以在绑定更新消息中携带目标网络支持的 IP协议栈类型信息, 或者
如果目标网络支持的 IP协议栈类型为 IPv4或者 IPv6, 则 UE 22以在绑 定更新消息中携带目标网络支持的 IP协议栈类型信息。 如果 UE 22未在绑定 更新消息中携带目标网络支持的 IP协议栈类型信息,则网络侧确认认为目标 网络支持的 IP协议栈类型信息为 IPv4/IPv6。
如果 UE 22在源网络 PDN连接使用 IPv4和 IPv6地址而目标网络 PDN连 接支持的 IP协议栈能力类型为 IP单栈, 则 UE 22对源网络 PDN连接的一个 PD 连接发送两个绑定更新消息到 Non- 3GPP Acces s 网元, 一个绑定更新中 的 IP地址请求指示信息设置为 IPv4, 另一个绑定更新消息中的 IP地址请求 指示信息设置为 IPv6。
步骤 611、 PGW 14收到上述消息后根据 APN定位到这个 UE 22使用的 PDN 连接, 则 PGW 14保留这个 PDN连接的 IP地址不变, 即 PGW 14对于这个 PDN 连接继续使用 UE 22在 3GPP网络时分配的 IP地址而不需要为这个 PDN连接 分配 IP地址。 后续处理同图 5所示实施例中的处理。
PGW 14回绑定确认 ( Binding Acknowledge ) 消息到 UE 22 , 消息中携带 这个 PDN连接使用的 IP地址。
本实施例中, non- 3GPP 网关通过绑定更新消息获取指定的 IP地址信息, 并根据指定的 IP地址信息进行网络切换, 实现了 UE在 non-3GPP网络中能够 继续使用移动终端在 3GPP网络中分配的 IP地址。
注: 本发明的实施例以 3GPP网络和 non-3GPP网络之间的切换来进行描 述, 但是本发明的机制同样适用于 3GPP网络之间的切换或者 non- 3GPP网络 之间的切换。
图 8为本发明网络选择系统实施例的结构示意图, 包括用户设备 31、 接 入网络发现和选择功能 ANDSF网元 32 , 所述用户设备 31从所述 ANDSF网元 32获取可用接入网络信息, 并根据所述用户设备 31在源网络中使用的 IP地 址信息以及所述可用接入网络信息, 从可用接入网络中选择目标网络; 或者 所述 ANDSF网元 32根据所述用户设备 31的上报信息获取所述用户设备 31在 源网络中的 I P地址信息,并根据所述用户设备 31在源网络中使用的 I P地址 信息以及可用接入网络信息, 从所述可用接入网络中选择目标网络。 详细过 程详见上述网络选择方法实施例。
本实施例中, 网络选择系统通过用户设备或 ANDSF 网元从可用接入网络
中选择与源网络 IP地址能力相同的目标网络,使得用户设备实现了目标网络 的优化选择,保证了移动终端在源网络中使用的 IP地址在目标网络都能继续 使用。
图 9为本发明移动终端实施例的结构示意图。 如图 9所示, 移动终端包 括可用接入网络信息获取单元 33和选择单元 34 , 其中, 可用接入网络信息 获取单元 33用于从网络侧的 ANDSF网元获取可用接入网络信息,该可用接入 网络信息可包括可用接入网络支持的 IP协议栈和 /或可用接入网络分组数据 网络 PDN连接支持的 IP协议栈能力类型; 选择单元 34根据用户设备在源网 络中使用的 IP地址信息以及可用接入网络信息获取单元 33获取的可用接入 网络信息, 从所述可用接入网络中选择目标网络。
选择单元 34可包括 IP协议栈获取子单元和目标选择子单元, IP协议栈 获取子单元从所述可用接入网络信息获取可用接入网络支持的 I P协议栈; 目 标选择子单元根据所述可用接入网络支持的 IP协议栈、所述用户设备在源网 络中使用的 IP地址信息选择目标网络。
或者, 选择单元 34可包括 IP协议栈能力类型获取子单元和目标选择子 单元, IP协议栈能力类型获取子单元从所述可用接入网络信息获取可用接入 网络 PDN连接支持的 IP协议栈能力类型; 目标选择子单元根据所述可用接入 网络 PDN连接支持的 IP协议栈能力类型、 所述用户设备在源网络中使用的 IP地址信息选择目标网络。
或者,选择单元 34可包括协议栈及能力类型获取子单元和目标选择子单 元, 协议栈及能力类型获取子单元从所述可用接入网络信息获取可用接入网 络 PDN连接支持的 IP协议栈能力类型和可用接入网络支持的 IP协议栈; 目 标选择子单元根据所述可用接入网络 PDN连接支持的 IP协议栈能力类型、所 述可用接入网络支持的 IP协议栈、 所述用户设备在源网络中使用的 IP地址 信息选择目标网络。
本实施例中, 移动终端通过可用接入网络信息获取单元获取可用接入网
络信息, 并由选择单元根据所述可用接入网络信息以及移动终端在源网络中 使用的 IP 地址信息选择目标网络, 实现了移动终端能够优先选择和源网络 IP地址能力相同的目标网络, 保证了移动终端在源网络中使用的 IP地址在 目标网络都能继续使用。
图 10本发明 IP地址处理系统实施例的结构示意图, 包括 IP地址获取单 元 41、 目标 IP指定单元 42及指定通知单元 43; IP地址获取单元 41用于获 取用户设备在源网络中使用的 IP地址信息; 目标 IP指定单元 42用于根据所 述用户设备在源网络中使用的 IP地址信息,指定所述用户设备在目标网络中 使用的 IP地址信息;指定通知单元 43用于发送所述指定的 IP地址信息到用 户面锅点网关。
IP地址获取单元 41可为 3GPP网络中的移动性管理网元或者非 3GPP网 络中的网元, 从归属用户服务器 HSS 中获取所述用户设备在源网络中使用的 IP地址信息。
目标 IP指定单元 42可包括: 能力类型获取子单元和第一指定子单元, 能力类型获取子单元用于获取所述目标网络的 PDN连接支持的 IP协议栈能力 类型;第一指定子单元用于根据所述用户设备在源网络中使用的 IP地址信息 和所述目标网络的 PDN连接支持的 IP协议栈能力类型,指定所述用户设备在 目标网络中使用的 I P地址信息;
或者可包括: 协议栈获取子单元和第二指定子单元, 协议栈获取子单元 用于获取所述目标网络支持的 IP协议栈; 第二指定子单元用于根据所述用户 设备在源网络中使用的 IP地址信息和所述目标网络支持的 IP协议栈, 指定 所述用户设备在目标网络中使用的 I P地址信息;
或者可包括: 能力类型与协议栈获取子单元、 第三指定子单元, 能力类 型与协议栈获取子单元可包括能力类型获取子单元和协议栈获取子单元, 用 于获取所述目标网络的 PDN连接支持的 IP协议栈能力类型和目标接入网络支 持的 IP 协议栈; 第三指定子单元用于根据所述用户设备在源网络中使用的
IP地址信息、 所述目标网络支持的 IP协议栈、 目标网络的 PDN连接支持的 IP协议栈能力类型, 指定所述用户设备在目标网络中使用的 IP地址信息。
上述网络切换时 IP 地址处理系统还可包括源网络中的移动性管理网元 或者用户面锚点网关, 将所述用户设备在源网络中使用的 IP地址信息, 注册 到归属用户服务器 HSS。
本实施例中 , IP地址处理系统通过目标 IP指定单元在网络切换过程中 指定 IP地址信息, 实现了移动终端在目标网络中继续使用 UE在源网络中分 配的 IP地址。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: ROM, RAM, 磁碟或者光盘等各种可以存储程序代码的介 质。
最后应说明的是: 以上实施例仅用以说明本发明的技术方案, 而非对其 限制; 尽管参照前述实施例对本发明进行了详细的说明, 本领域的普通技术 人员应当理解: 其依然可以对前述各实施例所记载的技术方案进行修改, 或 者对其中部分技术特征进行等同替换; 而这些修改或者替换, 并不使相应技 术方案的本质脱离本发明各实施例技术方案的精神和范围。
Claims
1、 一种网络选择方法, 其特征在于, 包括:
获取可用接入网络信息和用户设备在源网络中使用的 IP地址信息; 根据所述可用接入网络信息和用户设备在源网络中使用的 IP地址信息, 从可用接入网络中选择目标网络。
2、 根据权利要求 1所述的网络选择方法, 其特征在于, 根据所述可用接 入网络信息和用户设备在源网络中使用的 IP地址信息 ,从可用接入网络中选 择目标网络包括:
从所述可用接入网络信息获取可用接入网络支持的 IP协议栈; 根据所述可用接入网络支持的 IP协议栈、所述用户设备在源网络中使用 的 IP地址信息选择目标网络;
或者包括:
从所述可用接入网络信息获取可用接入网络分组数据网络连接支持的 I P 协议栈能力类型;
根据所述可用接入网络分组数据网络连接支持的 IP协议栈能力类型、所 述用户设备在源网络中使用的 I P地址信息选择目标网络;
或者包括:
从所述可用接入网络信息获取可用接入网络分组数据网络连接支持的 I P 协议栈能力类型和可用接入网络支持的 IP协议栈;
根据所述可用接入网络分组数据网络连接支持的 IP协议栈能力类型、所 述可用接入网络支持的 IP协议栈、 所述用户设备在源网络中使用的 IP地址 信息选择目标网络。
3、 根据权利要求 1或者 2所述的网络选择方法, 其特征在于, 根据所述 可用接入网络信息和用户设备在源网络中使用的 IP地址信息 ,从可用接入网 络中选择目标网络包括:
所述用户设备获取接入网络发现和选择功能网元发送的可用接入网络信 息;
所述用户设备根据所述可用接入网络信息以及用户设备在源网络中使用 的 I P地址信息, 从可用接入网络中选择目标网络。
4、 根据权利要求 1或者 2所述的网络选择方法, 其特征在于, 根据所述 可用接入网络信息和用户设备在源网络中使用的 IP地址信息,从可用接入网 络中选择目标网络包括:
接入网络发现和选择功能网元获取用户设备发送的 I P 地址信息, 所述 I P地址信息为用户设备在源网络中使用的 I P地址信息;
所述接入网络发现和选择功能网元根据可用接入网络信息以及所述用户 设备在源网络中使用的 I P地址信息, 从可用接入网络中选择目标网络。
5、 一种网络切换时 IP地址处理方法, 其特征在于, 包括:
获取用户设备在源网络中使用的 IP地址信息;
根据所述用户设备在源网络中使用的 IP地址信息,指定所述用户设备在 目标网络中使用的 I P地址信息;
发送指定的 IP地址信息到用户面锚点网关。
6、 根据权利要求 5所述的网络切换时 IP地址处理方法, 其特征在于, 获取用户设备在源网络中使用的 IP地址信息具体为: 划网络中的网关, 从归属用户服务器中获取所述用户设备在源网络中使用的 IP地址信息。
7、 根据权利要求 5所述的网络切换时 IP地址处理方法, 其特征在于, 还包括:
源网络中的移动性管理网元或者用户面锚点网关, 将所述用户设备在源 网络中使用的 IP地址信息, 注册到归属用户服务器。
8、 根据权利要求 5所述的网络切换时 IP地址处理方法, 其特征在于,
还包括:
获取所述目标网络的分组数据网络连接支持的 IP协议栈能力类型和 /或 目标网络支持的 IP协议栈;
则根据所述用户设备在源网络中使用的 IP地址信息,指定所述用户设备 在目标网络中使用的 I P地址信息包括:
根据所述用户设备在源网络中使用的 IP 地址信息和所述目标网络的分 组数据网络连接支持的 IP协议栈能力类型,指定所述用户设备在目标网络中 使用的 IP地址信息;
或者
根据所述用户设备在源网络中使用的 IP地址信息,指定所述用户设备在 目标网络中使用的 IP地址信息包括:
根据所述用户设备在源网络中使用的 IP 地址信息和所述目标网络支持 的 IP协议栈, 指定所述用户设备在目标网络中使用的 IP地址信息;
或者
根据所述用户设备在源网络中使用的 I P地址信息、所述目标网络支持的 IP协议栈、 目标网络的分组数据网络连接支持的 IP协议栈能力类型, 指定 所述用户设备在目标网络中使用的 I P地址信息。
9、 根据权利要求 5所述的网络切换时 IP地址处理方法, 其特征在于, 获取用户设备在源网络中使用的 I P地址信息包括:
用户设备获取用户设备在源网络中使用的 IP地址信息;
所述发送所述指定的 IP地址信息到用户面锚点网关包括:
所述用户设备发送所述指定的 IP 地址信息到第三代合作伙伴计划网络 中的移动性管理网元或者非第三代合作伙伴计划网络中的网关; 伴计划网络中的网关发送所述指定的 IP地址信息到所述用户面锚点网关。
10、 一种移动终端, 其特征在于, 包括:
可用接入网络信息获取单元, 用于从网络侧获取可用接入网络信息; 选择单元,用于根据用户设备在源网络中使用的 IP地址信息以及所述可 用接入网络信息, 从可用接入网络中选择目标网络。
11、根据权利要求 10所述的移动终端,其特征在于,所述选择单元包括: IP协议栈获取子单元, 用于从所述可用接入网络信息获取可用接入网络 支持的 IP协议栈; 或者
IP协议栈能力类型获取子单元, 用于从所述可用接入网络信息获取可用 接入网络分组数据网络连接支持的 IP协议栈能力类型; 或者
协议栈及能力类型获取子单元, 用于从所述可用接入网络信息获取可用 接入网络分组数据网络连接支持的 IP 协议栈能力类型和可用接入网络支持 的 IP协议栈;
所述选择单元还包括:
目标选择子单元, 用于根据所述可用接入网络支持的 IP协议栈、 所述用 户设备在源网络中使用的 IP地址信息选择目标网络, 或者
用于根据所述可用接入网络分组数据网络连接支持的 IP 协议栈能力类 型、 所述用户设备在源网络中使用的 IP地址信息选择目标网络; 或者。
用于根据所述可用接入网络分组数据网络连接支持的 IP 协议栈能力类 型、 所述可用接入网络支持的 IP 协议栈、 所述用户设备在源网络中使用的 IP地址信息选择目标网络。
12、 一种接入网络发现和选择功能网元设备, 其特征在于, 包括:
I P地址获取单元, 用于获取用户设备在源网络中使用的 I P地址信息; 选择单元, 用于根据可用接入网络信息以及所述用户设备在源网络中使 用的 I P地址信息, 从可用接入网络中选择目标网络。
13、 根据权利要求 12所述的接入网络发现和选择功能网元设备, 其特征 在于, 所述选择单元包括:
IP协议栈获取子单元, 用于从所述可用接入网络信息获取可用接入网络
支持的 IP协议栈; 或者
IP协议栈能力类型获取子单元, 用于从所述可用接入网络信息获取可用 接入网络分组数据网络连接支持的 IP协议栈能力类型; 或者
协议栈及能力类型获取子单元, 用于从所述可用接入网络信息获取可用 接入网络分组数据网络连接支持的 IP 协议栈能力类型和可用接入网络支持 的 IP协议栈;
所述选择单元还包括:
目标选择子单元, 用于根据所述可用接入网络支持的 IP协议栈、 所述用 户设备在源网络中使用的 IP地址信息选择目标网络, 或者
用于根据所述可用接入网络分组数据网络连接支持的 IP 协议栈能力类 型、 所述用户设备在源网络中使用的 IP地址信息选择目标网络; 或者。
用于根据所述可用接入网络分组数据网络连接支持的 IP 协议栈能力类 型、 所述可用接入网络支持的 IP 协议栈、 所述用户设备在源网络中使用的 IP地址信息选择目标网络。
14、 一种网络选择系统, 包括用户设备、 接入网络发现和选择功能网元, 其特征在于,
所述接入网络发现和选择功能网元用于提供可用接入网络信息; 所述用户设备用于从所述接入网络发现和选择功能网元获取可用接入网 络信息,并根据所述用户设备在源网络中使用的 IP地址信息以及所述可用接 入网络信息, 从可用接入网络中选择目标网络。
15、 一种网络选择系统, 包括用户设备、 接入网络发现和选择功能网元, 其特征在于,
所述用户设备用于上报信息;
所述接入网络发现和选择功能网元用于根据所述用户设备的上报信息获 取所述用户设备在源网络中的 IP地址信息,并根据所述用户设备在源网络中 使用的 IP地址信息以及可用接入网络信息,从所述可用接入网络中选择目标
网络。
16、 一种 IP地址处理系统, 其特征在于, 包括:
I P地址获取单元, 用于获取用户设备在源网络中使用的 I P地址信息; 目标 IP指定单元, 用于根据所述用户设备在源网络中使用的 IP地址信 息, 指定所述用户设备在目标网络中使用的 IP地址信息;
指定通知单元, 用于发送指定的 IP地址信息到用户面锚点网关。
17、 根据权利要求 16所述的 IP地址处理系统, 其特征在于, 所述 IP地 址获取单元为第三代合作伙伴计划网络中的移动性管理网元或者非第三代合 作伙伴计划网络中的网关, 用于从归属用户服务器中获取所述用户设备在源 网络中使用的 I P地址信息。
18、 根据权利要求 16所述的 IP地址处理系统, 其特征在于, 还包括源 网络中的移动性管理网元或者用户面锚点网关, 用于将所述用户设备在源网 络中使用的 IP地址信息, 注册到归属用户服务器。
19、 根据权利要求 16所述的 I P地址处理系统, 其特征在于, 目标 I P指 定单元还包括:
能力类型获取子单元, 用于获取所述目标网络的分组数据网络连接支持 的 IP协议栈能力类型;
第一指定子单元,用于根据所述用户设备在源网络中使用的 IP地址信息 和所述目标网络的分组数据网络连接支持的 IP协议栈能力类型,指定所述用 户设备在目标网络中使用的 I P地址信息;
或者所述目标 IP指定单元还包括:
协议栈获取子单元, 用于获取所述目标网络支持的 IP协议栈; 第二指定子单元,用于根据所述用户设备在源网络中使用的 IP地址信息 和所述目标网络支持的 IP 协议栈, 指定所述用户设备在目标网络中使用的 IP地址信息;
或者所述目标 IP指定单元还包括:
能力类型与协议栈获取子单元, 用于获取所述目标网络的分组数据网络 连接支持的 IP协议栈能力类型和目标接入网络支持的 IP协议栈;
第三指定子单元, 用于根据所述用户设备在源网络中使用的 IP 地址信 息、 所述目标网络支持的 IP 协议栈、 目标网络的分组数据网络连接支持的 IP协议栈能力类型, 指定所述用户设备在目标网络中使用的 IP地址信息。
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