CN105813153A - Internetwork switching method, Internetwork switching system and network element - Google Patents
Internetwork switching method, Internetwork switching system and network element Download PDFInfo
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Abstract
The invention discloses an Internetwork switching method, an Internetwork switching system and a network element. The method comprises steps that an Internetwork switching prompt is sent by an access network discovery and selection function (ANDSF) server to an ANDSF client of the use equipment (UE) according to strategies; a switching instruction from the UE and the user information are received by the ANDSF server; a switching indication is sent by the ANDSF server to a target network according to the switching instruction and the user information; the UE is notified by the ANDSF server to execute Internetwork switching so as to switch the UE to the target network. According to the Internetwork switching method, the Internetwork switching system and the network element, the ANDSF server can carry out Internetwork system switching according to the switching instruction initiated by the ANDSF client on the UE, moreover, network switching can be realized on the condition that an IP address can be reserved, so business continuity of applications with high timeliness requirements is guaranteed, the user plays a leading role in Internetwork switching through introducing the APP client, and user experience is improved.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of inter-network switch method, network element and system.
Background technology
WLAN (WirelessLocalAreaNetworks in recent years, WLAN) and LTE (LongTermEvolution, Long Term Evolution) combination network is at 3GPP (The3rdGenerationPartnershipProject, third generation partner program) normal structure proposes the networking plan of SaMOG (S2aMobilitybasedonGTP, based on the S2a mobility of GTP).Current network capabilities and terminal capability belong to transparent single connection pattern (TransparentSingle-Connectionmode), this pattern is one of connected mode defining the collaborative networking of WLAN and LTE after 3GPPR12 version, but, under this connected mode of present stage, terminal cannot initiate the switching of cross-system.
Therefore, it is necessary to propose a kind of inter-network switch method so that terminal can initiate and realize cross-system switching in WLAN and LTE combination network.
Summary of the invention
To solve one of the disclosure technical problem is how so that terminal can initiate and realize cross-system switching in WLAN and LTE combination network.
The disclosure provides a kind of inter-network switch method, including: access network discovery and selection function ANDSF server send across a network switch prompting according to strategy to the ANDSF client of user equipment (UE)；ANDSF server receives the switching command from UE and user profile；ANDSF server sends switching instruction according to switching command and user profile and arrives objective network；ANDSF server notice UE performs across a network and switches so that UE is switched to objective network.
Further, user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address；ANDSF server sends switching instruction according to switching command and user profile and includes to objective network: ANDSF server sends the switching instruction controller to objective network according to switching command and user profile, thus trigger packet data gateway P-GW sets up the connection of UE and objective network based on IP address.
Alternatively, the connection that P-GW sets up UE and objective network based on IP address includes: P-GW receives switching instruction, it may be judged whether distributing IP address for UE, and if distributing IP address, then adopting identical IP address to set up the connection of UE and objective network.
Alternatively, UE from Long Term Evolution LTE be switched to WLAN WLAN time, controller is that the checking of third generation partner program, authorization and accounting 3GPPAAA, ANDSF server switch, according to switching command and user profile transmission, the controller indicating objective network thus triggering the P-GW connection setting up UE and objective network based on IP address and including: the switching including user profile is indicated and is sent to 3GPPAAA by ANDSF server；3GPPAAA is when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, based on user IMSI (InternationalMobileSubscriberIdentificationNumber, international mobile subscriber identity) to TWAG (trustedwirelessLANaccessgateway, credit WLAN accesses gateway) authorization messages in insert switching instruction, change type of attachment into handover request；After P-GW reception TWAG asks according to the session establishment that handover request sends, for the IP address that UE distribution is identical；P-GW is identified by the P-GW of himself and APN information passes to 3GPPAAA server, obtains authentication information from 3GPPAAA；P-GW sends session establishment response, and it is the UE IP address used when LTE accesses that IP address is sent to UE, IP address.
Alternatively, UE from WLAN WLAN be switched to Long Term Evolution LTE time, controller is mobile management entity MME, and ANDSF server sends switching instruction to the controller of objective network thus triggering the P-GW connection setting up UE and objective network based on IP address and including according to switching command and user profile: switching instruction and user profile are issued to MME by ANDSF server；MME receive UE attachment request after based on user IMSI insert switching instruction, change attachment request into handover request；UE is authenticated by MME according to HSS (HomeSubscriberServer, home subscriber server), if certification success, MME performs location updating and subscription data acquisition process；P-GW sends session establishment request according to MME and sends session establishment response, and session establishment response includes UE and accesses the IP address used at WLAN.
Alternatively, method includes: strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type.
The disclosure also provides for a kind of network element, including:
Sending module, for sending across a network switch prompting according to strategy to the ANDSF client of user equipment (UE)；Receiver module, is used for receiving the switching command from UE and user profile；Switching instruction, for generating switching instruction according to switching command and user profile, is sent to objective network by sending module by processing module；Sending module is additionally operable to notice UE and performs across a network switching so that UE is switched to objective network.
Further, user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address, sending module is used for: send the switching instruction controller to objective network according to switching command and user profile, thus trigger packet data gateway P-GW sets up the connection of UE and objective network based on IP address；And/or strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type.
The disclosure also provides for a kind of across a network switched system, including: such as said network element；
ANDSF client, for receiving the across a network switch prompting that network element sends according to strategy, transmission switching command and user profile are to network element；P-GW, is used for receiving switching instruction, it may be judged whether distributing IP address for UE, and if distributing IP address, then adopting identical IP address to set up the connection of UE and objective network；The checking of third generation partner program, authorization and accounting 3GPPAAA, be used for controlling UE and access WLAN；Controller is mobile management entity MME, is used for controlling UE and accesses LTE.
Alternatively, UE is switched to WLAN WLAN from Long Term Evolution LTE, including:
Network element is sent to 3GPPAAA for the switching including user profile being indicated；3GPPAAA for when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, inserting switching instruction based on user IMSI, change type of attachment into handover request in the authorization messages of TWAG；P-GW is for, after receiving the TWAG session establishment sent according to handover request request, distributing identical IP address for UE；P-GW passes to 3GPPAAA server for being identified by the P-GW of himself with APN information, obtains authentication information from 3GPPAAA；P-GW is used for sending session establishment response, and it is the UE IP address used when LTE accesses that IP address is sent to UE, IP address.
Alternatively, UE is switched to Long Term Evolution LTE from WLAN WLAN, including:
Network element is for being issued to MME by switching instruction and user profile；MME for receive UE attachment request after based on user IMSI insert switching instruction, change attachment request into handover request；MME is for being authenticated UE according to HSS, if certification success, MME performs location updating and subscription data acquisition process；P-GW sends session establishment response for sending session establishment request according to MME, and session establishment response includes UE and accesses the IP address used at WLAN.
Inter-network switch method, network element and the system that the disclosure provides, according to the switching command that ANDSF client on UE is initiated, ANDSF server can carry out across a network switching.
Accompanying drawing explanation
Fig. 1 illustrates the flow chart of the inter-network switch method of one embodiment of the invention.
Fig. 2 illustrates S2a and the S2b networking plan schematic diagram of one embodiment of the invention.
Fig. 3 illustrates the ANDSF configuration diagram under the non-roaming scene of one embodiment of the invention.
Fig. 4 A illustrates the collaborative networking schematic diagram of LTE and WLAN of one embodiment of the invention.
Fig. 4 B illustrates the interface diagram between ANDSFServer and the 3GPPAAA of one embodiment of the invention, MME.
Fig. 5 A illustrates the ANDSF workflow schematic diagram of one embodiment of the invention.
Fig. 5 B illustrates the ANDI policy information child node schematic diagram of one embodiment of the invention.
Fig. 5 C illustrates the ISMP policy information child node schematic diagram of one embodiment of the invention.
Fig. 6 illustrates that the DNS mode of one embodiment of the invention carries out the schematic flow sheet of ANDSF discovery.
Fig. 7 illustrates the schematic flow sheet that message transport occurs between ANDSFServer and the UE of one embodiment of the invention.
Fig. 8 illustrates the hand-off process schematic flow sheet of LTE to the WLAN of one embodiment of the invention.
Fig. 9 illustrates the hand-off process schematic flow sheet of WLAN to the LTE of one embodiment of the invention.
Figure 10 illustrates the structural representation of the network element of one embodiment of the invention.
Figure 11 illustrates the structural representation of the across a network switched system of one embodiment of the invention
Detailed description of the invention
With reference to the accompanying drawings the present invention is described more fully, the exemplary embodiment of the present invention is wherein described.
Fig. 1 illustrates the flow chart of the inter-network switch method of one embodiment of the invention.As it is shown in figure 1, the method specifically includes that
Step 100, access network discovery and selection function ANDSF server send across a network switch prompting according to strategy to the ANDSF client of user equipment (UE).
Step 102, ANDSF server receives the switching command from UE and user profile.
Step 104, ANDSF server sends switching instruction according to switching command and user profile and arrives objective network.
Step 106, ANDSF server notice UE performs across a network and switches so that UE is switched to objective network.
The inter-network switch method of the embodiment of the present invention, according to the switching command that ANDSF client on UE is initiated, ANDSF server can carry out across a network switching.
In one embodiment, user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address,
ANDSF server sends switching instruction according to switching command and user profile and includes to objective network: ANDSF server sends the switching instruction controller to objective network according to switching command and user profile, thus triggering P-GW to set up the connection of UE and objective network based on IP address.
The inter-network switch method of the embodiment of the present invention, it is possible to handover network under the premise retaining IP address, it is prevented that user goes offline or re-registers, improves Consumer's Experience.
In implementing one, the connection that P-GW sets up UE and objective network based on IP address includes:
Packet data gateway P-GW receives switching instruction, it may be judged whether distributing IP address for UE, and if distributing IP address, then adopting identical IP address to set up the connection of UE and objective network.
The method that the present invention realizes retaining the switching of IP address between LTE and wlan network based on ANDSF framework, by ANDSFAPP client, user informs that ANDSFServer to carry out across a network switching, ANDSFServer is by issuing switching instruction with the interface of MME or 3GPPAAA, insertion switching (handover) instruction in the process connected is set up user to switching objective network by the controller of objective network such as MME or 3GPPAAA, after guaranteeing that P-GW detects " handover " instruction, check whether and distributed IP address to this user, if address was distributed, then adopt identical IP address to distribute to this user to use.So, can ensure that the seamless switching only supporting that under existing flow process the terminal of transparent single connection pattern is capable of LTE and wlan network, ensure that the business continuance that requirement of real-time height is applied, and introduce APP ad hoc mode and achieve the dominance that across a network is switched by user.
In one embodiment, UE from LTE be switched to WLAN time, controller is that 3GPPAAA, ANDSF server sends switching instruction to the controller of objective network thus triggering the P-GW connection setting up UE and objective network based on IP address and including according to switching command and user profile: the switching including user profile is indicated and is sent to 3GPPAAA by ANDSF server；3GPPAAA, when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, inserts switching instruction based on user IMSI in the authorization messages of TWAG, changes type of attachment into handover request；After packet data network gateway (PDNGateway, PDN-GW, it is possible to be abbreviated as P-GW) receives the TWAG session establishment sent according to handover request request, for the IP address that UE distribution is identical；P-GW is identified by the P-GW of himself and APN information passes to 3GPPAAA server, obtains authentication information from 3GPPAAA；P-GW sends session establishment response, and IP address is sent to UE.
In one embodiment, UE from WLAN be switched to LTE time, controller is MME (mobile management entity, MobilityManagementEntity), ANDSF server sends switching instruction to the controller of objective network thus triggering the P-GW connection setting up UE and objective network based on IP address and including according to switching command and user profile: switching instruction and user profile are issued to MME by ANDSF server；MME receive UE attachment request after based on user IMSI insert switching instruction, change attachment request into handover request；UE is authenticated by MME according to HSS, if certification success, MME performs location updating and subscription data acquisition process；P-GW sends session establishment request according to MME and sends session establishment response, and session establishment response includes UE and accesses the IP address used at WLAN.
In one embodiment, strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type；After UE sets up the connection with objective network according to the IP address of former network, the connection of release and former network.
In the networking plan of the SaMOG of LTE and WLAN combination network in one embodiment, increase TWAG (TrustedWLANAccessGateway in a network, credit WLAN accesses gateway) network element, EPC (EnhancedPacketCore is accessed as WLAN, strengthen core net) access gateway, P-GW (PDNGateway or PublicDataNetworkGateway, common data base gateway) it is responsible for the process of user data package and other networks, become the management node that being uniformly controlled of LTE and WLAN business, charging and IP address are distributed.
3 kinds of schemes of the collaborative definition of WLAN and LTE, are called S2a, S2b, S2c in 3 gpp.Fig. 2 illustrates S2a and the S2b networking plan schematic diagram of one embodiment of the invention.Wherein S2a scheme accesses as credit network insertion to EPC network for WLAN, and first line of a couplet P-GW interface is S2a；S2b scheme accesses as non-credit network insertion to EPC network for WLAN, and namely first line of a couplet P-GW interface is S2b.nullS2a scheme has two schemes of existence，A kind of scheme is in the non-3 gpp IP Access Network (TrustedNon-3GPPIPAccess) of credit，BRAS (BroadbandRemoteAccessServer to wlan network，Broadband Remote Access Server) or AC (AuthenticationCenter，AUC) network element carry out transformation support S2a，Its S2a interface can use MIP (MobileIP，Mobile network protocol) agreement or GTP (GeneralDataTransferPlatform，General data transfer platform) agreement，Another kind of scheme is in the non-3 gpp IP Access Network of credit，Introduce new network element and TWAG，S2a interface is supported by it，Its S2a interface is only capable of using GTP agreement，So being called SaMOG.
In one embodiment, it is possible to the technical scheme of invention is applied to by whole S2a scheme.
Based on the WLAN of the SaMOG scheme Three models accessed in 3GPP standard: transparent single connection pattern (TransparentSingle-Connectionmode), single connection pattern (Single-Connectionmode), multi-link pattern (Multi-Connectionmode), it is possible to for distinguishing the terminal capability supporting R11 and R12 different phase:
1) transparent single connection pattern: be defined as the WLAN of credit when setting up S2a tunnel or NSWO (WLAN shunt of non-seamless, Non-seamlessWLANoffload), terminal is not had the communication pattern between the UE of particular/special requirement and the TWAN of credit；
2) single connection pattern: be defined as between UE with the TWAN of credit and at a time only support to set up an ability being connected.This connection may be used for NSWO or PDN and connects.Use and connection relevant parameter (such as: for NSWO, for PDN connection, APN etc.) of single connection pattern are consulted during the certification of TWAN.
3) multi-link pattern: be defined as between UE with the TWAN of credit and at a time can set up be connected, it is also possible to set up the ability of a plurality of connection.Article one, connection may be used for NSWO, one or more concurrently connect may be used for PDN connect.Using of multi-link pattern is consulted during the certification of TWAN, and PDN establishment of connection uses WLCP agreement.
For UE, it is possible to SaMOG scheme is divided into two stages of the UE-Impact of no-UE-Impact and R12 to R11:
For the no-UE-Impact stage, it is mainly characterized by comprising:
1) UE before R11 is not carried out function enhancing, including:
-do not support the flow processs such as many PDN connection, switching；
-do not support the information such as transmission APN, PDN type.
2) do not support to be concurrently accessed the scene of EPC and NSWO；
3) the UE function before compatible R11.
For the UE-Impact stage, it is mainly characterized by comprising:
1) the R11 version of compatible SaMOG scheme；
2) flow processs such as many PDN connection, switching are supported；
3) information such as transmission APN, PDN type are supported；
4) support to be concurrently accessed the scene of EPC and NSWO.To network side, UE can indicate whether it supports to access EPC or NSWO, and network side also can indicate the result accessing EPC or NSWO of decision-making to UE.
Meanwhile, 3GPPTR23.852 it is also proposed needs to consider following scene:
1) Access Control of EPC resources/services is accessed；
2) EPS business seamless mobility between 3GPP and WLAN: IP address is constant；
3) EPS business non-seamless mobility between 3GPP and WLAN: IP address change；
4) the single PDN supporting UE connects and is connected with many PDN；
5) support access EPC and the NSWO of WLAN simultaneously.
Connection mode of the prior art is refined definition in conjunction with terminal capability and scene by the present invention further:
Table one connection mode explanation
nullAccording to above-mentioned analysis，In prior art, network capabilities and terminal capability belong to transparent single connection pattern (TransparentSingle-Connectionmode)，Terminal cannot initiate the switching of cross-system，Network also cannot realize retaining between LTE and wlan network the switching of IP address，Even if version can pass through single connection pattern (Single-Connectionmode) after R12、The support of multi-link pattern (Multi-Connectionmode)，And utilize EAP-AKA (ExtensibleAuthenticationProtocol-AuthenticationandKeyAgr eement，Extensible Authentication Protocol-certifiede-mail protocol) certification extension could realize between LTE and wlan network retain IP address handoff functionality，But currently there are not the terminal and the network equipment that possess this kind of ability，Need under existing network condition，The method retaining the switching of IP address between the LTE of present invention proposition and wlan network，Terminal or network can initiate across a network switching，And when being switched to objective network in across a network handoff procedure，IP address original for UE can be retained，Prevent user at the disconnection of across a network handoff procedure，Improve Consumer's Experience.
Fig. 3 illustrates the ANDSF configuration diagram under the non-roaming scene of one embodiment of the invention, a new ANDSF functional entity such as H-ANDSF302 can be increased at network side, this ANDSF functional entity it comprises Network finding and selects relevant data management and control function, can to UE301 propelling data under the triggering of network side by the S14 interface between UE, the request that can also respond UE transmits data for it, and the content of transmission is determined by operator.Wherein, H-ANDSF refers to Home-ANDSF (ownership place ANDSF server).
In order to make terminal in the relevant information performing obtain in advance various Access Network (3GPP Access Network and non-3 GPP access network) before rete mirabile switches, carry out Network finding in advance for terminal and select to reduce handover delay, ANDSF (AccessNetworkDiscoveryandSelectionFunction is introduced in EPC core net, access network discovery and selection function), a new ANDSF functional entity is increased at network side, can to UE propelling data under the triggering of network side by the S14 interface between UE, the request that can also respond UE transmits data for it, thus implementing to select based on the across a network of strategy or switching.
Fig. 4 A illustrates the collaborative networking schematic diagram of LTE and WLAN of one embodiment of the invention, and the collaborative networking of LTE and WLAN includes SaMOG scheme and ANDSF scheme.Increasing TWAG network element in a network and access the access gateway of EPC as WLAN, this network element covers the function of TWAG and TWAP (TrustedWLANAAAProxy, credit WLANAAA act on behalf of) two logical nes involved by SaMOG scheme of 3GPP standard；Increasing ANDSF network element, this network element is mutual by what be arranged between the ANDSFAPP client-side program in terminal, it is achieved Network finding when user accesses and selection.
The present invention arranges a kind of ANDSFAPP client on UE, it is possible to an installable APP, for terminal can pre-install can also after fill, terminal communication module is implemented to control management by this APP client.By arranging this APP client in UE side, it is possible to allow users to selection network actively or carry out across a network switching, network is selected or the control of switching can hand in user's hands.
Fig. 4 B illustrates the interface diagram between ANDSFServer and the 3GPPAAA of one embodiment of the invention, MME, such as Fig. 4 B, this interface definition becomes ANDSFServer to issue with user profile such as to 3GPPAAA, MME: the switching instruction of IMSI, APN, IP address etc. binding.Simultaneously, 3GPPAAA, MME will each process accordingly, wherein 3GPPAAA will change into being handed down in the authorization message of TWAG type of attachment " switching attachment " based on IMSI information index, and the UE carrying out performing LTE and WLAN switching will be sent type of attachment in the AttachRequest come up based on IMSI information index and be revised as " switching is adhered to " for " initially attachment " by MME.Follow-up TWAG or MME all will process by switching flow definition.
nullThe method realizing retaining the switching of IP address between LTE and wlan network based on ANDSF framework that the embodiment of the present invention proposes，By ANDSFAPP client, user informs that ANDSFServer to carry out across a network switching，ANDSFServer is by issuing switching instruction with the interface of MME or 3GPPAAA，Terminal is initiated normal access request and becomes handover request，Insertion " handover " instruction in the process connected is set up user to switching objective network by MME or 3GPPAAA，Guarantee P-GW (PDNGateway，Public data network gateway) detect " handover " instruction after，Check whether and distributed IP address to this user，If address was distributed，Then adopt identical IP address to distribute to this user to use.This patent is without to existing EAP (ExtensibleAuthenticationProtocol, Extensible Authentication Protocol) authentication protocol is extended, can ensure that only support under existing flow process the terminal of transparent single connection pattern be capable of between LTE and wlan network retain IP address switching, meanwhile, introduce APP ad hoc mode and achieve the dominance that across a network is switched by user.
Fig. 5 A illustrates the ANDSF workflow schematic diagram of one embodiment of the invention, when user performs to switch, it is possible to be switched to WLAN from LTE, it is also possible to be switched to LTE, Fig. 5 A to be switched to WLAN from LTE from WLAN, the workflow of ANDSF be described, as shown in Figure 5A
S501:UE is linked in LTE system.
S502: open the ANDSFAPP client of UE side, it communicates with the ANDSFServer foundation of network side with dns resolution mode or client configuration of IP address mode, and this process is ANDSFDiscovery (ANDSF discovery procedure)；
S503:ANDSFServer issues, based on the position of UE, the message that can be switched to WLAN, and these strategies can be that time, position, LTE network load and quality and use application type etc. are because usually triggering；
S504: chosen whether to carry out the switching of cross-system by user oneself.Do not switch over if user have selected, then will continue to keep the connection of LTE；
S505: to switch over if user have selected, then reported ANDSFServer by ANDSFAPP client by the relevant information (such as IMSI, APN, IP address etc.) of the decision and user that perform switching；
The switching of user bound information is indicated and is issued in handover target system by S506:ANDSFServer, for be issued on the 3GPPAAA network element of wlan system in this example, sees the description of Fig. 4；
S507:ANDSFServer sends switch acknowledgment message to ANDSFAPP client, informs that UE can perform the switching of cross-system；
S508: complete the process of cross-system switching.
The ANDSF workflow of the embodiment of the present invention, it is possible to realize the switching of UE cross-system based on the instruction of ANDSFAPP client.ANDSF provides routing policy ISRP (inter-systemroutingpolicy) and APN (AccessPointName between inter-system mobility strategy ISMP (inter-systemmobilitypolicy inter-system mobility strategy), ANDI access network discovery information (accessnetworkdiscoveryinformation), system, access point name) between the information of routing policy IARP (inter-APNroutingpolicy) 4 kinds of types, can be whole offer, it is also possible to be that one of which is only provided.
The basis of the present invention is the transparent single connection pattern of SaMOG, and at least available three kinds of strategies in ANDSF, including ANDI, ISMP and IARP.ANDSF server sends the prompting that can switch over according to strategy to ANDSFAPP client, this strategy includes the type of service of static state, time, user property, dimensions such as position and quasi real time/dynamic network load and quality, user uses multiple dimensions such as flow, these dimensions trigger ANDSF server and send the prompting that can switch over to ANDSFAPP client, and communicate between ANDSF server with ANDSFAPP client and have employed the content of 3GPP standard definition, what push is ANDSFMO (management object), it has reference format, wlan network list or LTE network list that UE mainly now can be selected by ANDI give ANDSFAPP client from ANDSF server push.ISMP specifies whether to be switched in these networks and when can be handed over.Which APN IARP then defines and business route can be switched in these networks and when can be handed over.
Fig. 5 B illustrates the ANDI policy information child node schematic diagram of one embodiment of the invention.Fig. 5 C illustrates the ISMP policy information child node schematic diagram of one embodiment of the invention.
In one embodiment, inter-system mobility strategy (ISMP) specifies whether to allow to carry out the movement between system, and is linked into the EPC system most suitable access system of selection for user.This strategy can be supplied to UE, ANDSF and based on carrier policy or Network finding and selection information based on UE transmission, the mobility strategy between system can also be modified.When terminal cannot pass through multiple access connection entrance EPC, use ISMP strategy.ISMP can identify user and use which kind of access technology or which specific Access Network to access EPC, it is possible to identify when to allow or forbid moving between system.Such as: ISMP may indicate that and do not allow to be switched to WLAN (or forbidding inter-system mobility special time or place scene) from LTE, can also indicate that WiMAX (WorldwideInteroperabilityforMicrowaveAccess, worldwide interoperability for microwave accesses) access priority higher than SSID1 (ServiceSetIdentifier, service set) access priority in WLAN and wlan network higher than SSID2 etc..Selecting function when use automatically accesses net, UE will not initiate EPC to restricted Access Network in ISMP and connect, the manual words selected of user, it is not necessary to consider this kind of restriction.Meanwhile, ISMP is also not related to circuit domain business.When use automatically accesses network selection, when between system, shift strategy indicates access EPC, if the access network of operator's preference or access technology list of types have precedence over the list of user preference.
Access network discovery information (ANDI) under the present embodiment brief description.Request according to UE, ANDSF can provide the access network list of all access systems of UE adjacent domain.Access network information can include access technology type (such as WLAN or WiMAX), Radio Access Network identifier (SSID of WLAN), other concrete technical information is such as one or more carrier frequency, and the access network information when constraints such as condition identity provides is effective.Terminal can retain the previous ANDI received, until system pushes new ANDI.
Routing policy (IARP) between APN under the present embodiment brief description.In order to support IP interface selection strategy in OPIIS research topic, formulate the Business Stream selection strategy to APN, introducing new routing policy IARP (Inter-APNRoutingPolicies), a selected APN must currently have the PDN of correspondence to connect existence.Each IP interface that can be used as routing policy selection is necessarily connected to different APN.IARP connects the selection of identical APN by not comprising multiple IP interface, and IP interface does not have corresponding APN to be not included in the route plan of IARP yet.Meanwhile, but existing APN selects mechanism such as a certain application high than IARP priority with the binding of APN and user preference, and IARP is provided by H-ANDSF, if what V-ANDSF issued, UE can ignore this IARP.
ANDSF is the discovery that the discovery being realized ANDSF under non-roaming scene by DNS or DHCP mode, it is also possible in UE the IP address of pre-configured ANDSF.Under roaming scence, UE is likely to obtain the IP address of H-ANDSF and V-ANDSF simultaneously.When UE is positioned under Visited PLMN (PublicLandMobileNetwork, public land mobile network), UE can use dns resolution mode to obtain the IP address of ANDSF.Fig. 6 illustrates that the DNS mode of one embodiment of the invention carries out the schematic flow sheet of ANDSF discovery.As shown in Figure 6, UE sets up connection by WLAN/CDMA/LTE and DNS, ANDSF, and DNS mode carries out the flow process of ANDSF discovery and includes:
Step 601, shift strategy between UE prefabrication system, UE sends DNS (DomainNameSystem, domain name system) query (inquiry) to DNS.
Step 602, DNS inquires response (DNSqueryresponse).
Step 603, UE sends generic alert (genericalert) to ANDSF server.
Fig. 7 illustrates the schematic flow sheet that message transport occurs between ANDSFServer and the UE of one embodiment of the invention.After UE completes ANDSF discovery procedure, by triggering the strategy of ANDSF, for instance: the policy informations such as ANDI, ISMP transfer between ANDSFServer and UE.As it is shown in fig. 7, the method includes:
Step 701, policy control and charging (PCC) or perception analysis system carry out updating network state.
Step 702, ANDSFserver performs updating network state and confirms.
Step 703, ANDSFserver sends SMS (ShortMessageService, SMS (Short Message Service)) to UE.
Step 704, Alert:Replace (end message).If not setting up secure connection, application sends warning message: replace.
Step 705, ANDSFserver judges to push which policy information according to position, application and network state etc..
Step 706, ANDSFserver sends Status (state): Replace (replacement) policy information to UE.
Step 707, UE sends condition responsive information to ANDSFserver.
Step 708, UE assessment strategy, the network performing response selects.
Fig. 8 illustrates the hand-off process schematic flow sheet of LTE to the WLAN of one embodiment of the invention, and as shown in Figure 8, this switching flow includes:
Step 801, UE accesses from LTE network, and using PMIPv6 (ProxyMobileIPv6, proxy mobile IPv 6 agreement) or GTP tunnel, this PMIPv6 on S5/S8 interface is a kind of network regional mobility management protocol；
Step 802, carrying out access information between ANDSF client and server mutual, if user selects to perform switching, server will collect the information (such as IMSI, APN, IP address etc.) of user, if user select do not perform switching, then will continue resident on an LTE network；
Step 803, switching instruction and user profile etc. are handed down to 3GPPAAA by newly-increased interface by ANDSF server；
Step 804, UE performs switching, to perform by the access procedure of defined non-3 gpp, UE accesses WLAN and initiates EAP (ExtensibleAuthenticationProtocol, Extensible Authentication Protocol) authentication process, 3GPPAAA inserts switching instruction based on user IMSI in TWAG authorization messages, type of attachment is changed into " handover ", follow-up for processing by switching flow definition；
Step 805, TWAG sends CreateSessionRequest message (including switching instruction) to P-GW and is designated WLAN access to P-GW, RATtype.Then P-GW reassigns identical IP address according to switching instruction；
Step 806, P-GW passes to 3GPPAAA server oneself mark and APN information, and obtains authentication information from 3GPPAAA；
Step 807, P-GW is to TWAN response CreateSessionResponse, and carries the IP address distributed before this UE when LTE accesses；
Step 808, the GTP tunnel between TWAG and P-GW is successfully established；
Step 809, TWAG notifies the foundation in 3GPPAAA tunnel, and EAP (ExtensibleAuthenticationProtocol, Extensible Authentication Protocol) process terminates i.e. WLAN side connection establishment and completes；
Step 810, P-GW initiates the PDN in network and connects deexcitation flow process, the resource of release LTE network side.
The inter-network switch method of the embodiment of the present invention, in switching flow from LTE to WLAN: UE first carries out initialization access request in accessing wlan system process, switching instruction will be inserted based on user IMSI in TWAG authorization messages at 3GPPAAA network element, type of attachment is changed into " handover ", follow-up TWAG will complete flow processing by the definition of switching flow, can ensure that the seamless switching only supporting that under existing flow process the terminal of transparent single connection pattern is capable of LTE and wlan network, ensure that the business continuance that requirement of real-time height is applied, and introduce APP ad hoc mode and achieve the dominance that across a network is switched by user.
Fig. 9 illustrates the hand-off process schematic flow sheet of WLAN to the LTE of one embodiment of the invention.As it is shown in figure 9, this flow process includes:
Step 901, UE accesses EPC by WLAN, uses GTP on S2a interface；
Step 902, carrying out information between ANDSF client and server mutual, if user selects to perform switching, server will collect the current information of user (IMSI, APN, IP address etc.), if user select do not perform switching, then will continue resident on an LTE network；
Step 903, switching instruction and user profile etc. are issued MME by newly-increased interface by ANDSF server；
Step 904, UE performs switching, and UE sends AttachRequest to MME, MME and inserts switching instruction based on user IMSI, is changed into " handover " by request type, follow-up for processing by switching flow definition:
Step 905, UE is connected to HSS by MME and is authenticated；
Step 906, after certification success, MME performs location updating and subscription data acquisition process；
Step 907～step 908, MME selects SGW and P-GW, sends CreateSessionRequest (including switching instruction) message and arrives P-GW to SGW again.Because comprising incision instruction, tunnel is not now switched to LTE from WLAN by P-GW；
Step 909～step 910, P-GW responds CreateSessionResponse message and arrives MME to SGW again, comprising UE in message and access the IP address used at WLAN, instruction S5 carrying is set up and is updated successfully, and PMIPv6 (ProxyMobileIPv6) or GTP tunnel are set up；
Step 911, LTE is wireless and access bearer is set up；
Step 912～913, MME sends amendment carrying request (ModifyBearerRequest) message and arrives P-GW to SGW again, and this amendment carrying request includes switching instruction.Because including switching instruction P-GW, tunnel is switched to LTE side from WLAN, gets started the acquiescence set up by message routing to SGW and special EPS carrying.
Step 914～step 915, P-GW returns amendment carrying response (ModifyBearerResponse) to SGW and MME and confirms；
Step 916, LTE system connection establishment completes, and user uses LTE to carry out reception and the transmission of data；
Step 917, P-GW initiates the resource release process of WLAN side.
The inter-network switch method of the embodiment of the present invention, in switching flow from WLAN to LTE, UE first carries out the AttachRequest of " initially attachment " in accessing LTE system process, switching instruction will be inserted based on user IMSI at MME network element, type of attachment is changed into " handover ", follow-up MME will complete flow processing by the definition of switching flow, can ensure that the seamless switching only supporting that under existing flow process the terminal of transparent single connection pattern is capable of LTE and wlan network, ensure that the business continuance that requirement of real-time height is applied, and introduce APP ad hoc mode and achieve the dominance that across a network is switched by user.
Figure 10 illustrates the structural representation of the network element of one embodiment of the invention, and this network element can be ANDSF server in one embodiment.As shown in Figure 10, this network element includes:
Sending module 1003, for sending across a network switch prompting according to strategy to the ANDSF client of user equipment (UE)；
Receiver module 1001, is used for receiving the switching command from UE and user profile；
Switching instruction, for generating switching instruction according to switching command and user profile, is sent to objective network by sending module 1003 by processing module 1002；
Sending module 1003 is additionally operable to notice UE and performs across a network switching so that UE is switched to objective network.
In one embodiment, user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address,
Sending module 1003 is used for, and sends the switching instruction controller to objective network according to switching command and user profile, thus trigger packet data gateway P-GW sets up the connection of UE and objective network based on IP address；And/or strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type.
Figure 11 illustrates the structural representation of the across a network switched system of one embodiment of the invention, and as shown in figure 11, this network element includes:
Network element 1101 described above；ANDSF client 1102, for receiving the across a network switch prompting that network element sends according to strategy, transmission switching command and user profile are to network element；P-GW1103, is used for receiving switching instruction, it may be judged whether distributing IP address for UE, and if distributing IP address, then adopting identical IP address to set up the connection of UE and objective network；The checking of third generation partner program, authorization and accounting 3GPPAAA1104, be used for controlling UE and access WLAN；Controller is mobile management entity MME 1105, is used for controlling UE and accesses LTE.
In one embodiment, UE is switched to WLAN WLAN from Long Term Evolution LTE, including: network element 1101 is sent to 3GPPAAA for the switching including user profile being indicated；3GPPAAA1104 for when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, inserting switching instruction based on user IMSI, change type of attachment into handover request in the authorization messages of TWAG；P-GW1103 is for, after receiving the TWAG session establishment sent according to handover request request, distributing identical IP address for UE；P-GW1103 passes to 3GPPAAA server for being identified by the P-GW of himself with APN information, obtains authentication information from 3GPPAAA；P-GW1103 is used for sending session establishment response, and it is the UE IP address used when LTE accesses that IP address is sent to UE, IP address.
In one embodiment, UE is switched to Long Term Evolution LTE from WLAN WLAN, including: network element 1101 is for being issued to MME by switching instruction and user profile；MME1105 for receive UE attachment request after based on user IMSI insert switching instruction, change attachment request into handover request；MME1105 is for being authenticated UE according to HSS, if certification success, MME performs location updating and subscription data acquisition process；P-GW1103 sends session establishment response for sending session establishment request according to MME, and session establishment response includes UE and accesses the IP address used at WLAN.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principles of the invention and practical application are better described, and makes those of ordinary skill in the art it will be appreciated that the present invention is thus design is suitable to the various embodiments with various amendments of special-purpose.
Claims (11)
1. an inter-network switch method, it is characterised in that including:
Access network discovery and selection function ANDSF server send across a network switch prompting according to strategy to the ANDSF client of user equipment (UE)；
ANDSF server receives the switching command from described UE and user profile；
ANDSF server sends switching instruction according to described switching command and user profile and arrives objective network；
ANDSF server notifies that described UE performs across a network and switches so that described UE is switched to described objective network.
2. method according to claim 1, it is characterised in that described user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address,
Described ANDSF server sends switching instruction according to described switching command and user profile and includes to objective network:
ANDSF server sends the switching instruction controller to objective network according to described switching command and user profile, thus trigger packet data gateway P-GW sets up the connection of described UE and described objective network based on described IP address.
3. method according to claim 2, it is characterised in that the connection that P-GW sets up described UE and described objective network based on described IP address includes:
Described P-GW receives switching instruction, it may be judged whether distributing IP address for described UE, and if distributing IP address, then adopting identical IP address to set up the connection of described UE and objective network.
4. according to the method in claim 2 or 3, it is characterized in that, UE from Long Term Evolution LTE be switched to WLAN WLAN time, described controller is that the checking of third generation partner program, authorization and accounting 3GPPAAA, ANDSF server switch, according to described switching command and user profile transmission, the controller indicating objective network thus triggering the P-GW connection setting up described UE and described objective network based on described IP address and including:
The switching including described user profile is indicated and is sent to 3GPPAAA by ANDSF server；
3GPPAAA, when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, inserts switching instruction based on user IMSI in the authorization messages of TWAG, changes type of attachment into handover request；
After P-GW reception TWAG asks according to the session establishment that described handover request sends, for the IP address that described UE distribution is identical；
P-GW is identified by the P-GW of himself and APN information passes to 3GPPAAA server, obtains authentication information from 3GPPAAA；
P-GW sends session establishment response, and described IP address is sent to described UE, and described IP address is the UE IP address used when LTE accesses.
5. according to the method in claim 2 or 3, it is characterized in that, UE from WLAN WLAN be switched to Long Term Evolution LTE time, described controller is mobile management entity MME, and described ANDSF server sends switching instruction to the controller of objective network thus triggering the P-GW connection setting up described UE and described objective network based on described IP address and including according to described switching command and user profile:
Switching instruction and user profile are issued to MME by ANDSF server；
MME receive UE attachment request after based on user IMSI insert switching instruction, change described attachment request into handover request；
UE is authenticated by MME according to HSS, if certification success, MME performs location updating and subscription data acquisition process；
P-GW sends session establishment request according to MME and sends session establishment response, and described session establishment response includes UE and accesses the IP address used at WLAN.
6. method according to claim 1, it is characterised in that including:
Described strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type.
7. a network element, it is characterised in that including:
Sending module, for sending across a network switch prompting according to strategy to the ANDSF client of user equipment (UE)；
Receiver module, is used for receiving the switching command from described UE and user profile；
Switching instruction, for generating switching instruction according to described switching command and user profile, is sent to objective network by described sending module by processing module；
Described sending module is additionally operable to notify that described UE performs across a network and switches so that described UE is switched to described objective network.
8. network element according to claim 1, it is characterised in that described user profile includes international mobile subscriber identity IMSI, APN APN, procotol IP address,
Described sending module is used for: send the switching instruction controller to objective network according to described switching command and user profile, thus trigger packet data gateway P-GW sets up the connection of described UE and described objective network based on described IP address；
And/or
Described strategy includes time, position, wlan network load and quality, LTE network load and quality or use application type.
9. an across a network switched system, it is characterised in that including:
Network element as claimed in claim 7 or 8；
ANDSF client, for receiving the across a network switch prompting that described network element sends according to strategy, transmission switching command and user profile are to described network element；
P-GW, is used for receiving switching instruction, it may be judged whether distributing IP address for UE, and if distributing IP address, then adopting identical IP address to set up the connection of described UE and objective network；
The checking of third generation partner program, authorization and accounting 3GPPAAA, be used for controlling UE and access WLAN；
Controller is mobile management entity MME, is used for controlling UE and accesses LTE.
10. system according to claim 9, it is characterised in that UE is switched to WLAN WLAN from Long Term Evolution LTE, including:
Described network element is sent to 3GPPAAA for the switching including described user profile being indicated；
3GPPAAA for when UE performs switching access WLAN and initiates Extensible Authentication Protocol authentication process, inserting switching instruction based on user IMSI, change type of attachment into handover request in the authorization messages of TWAG；
P-GW is for after receiving the TWAG session establishment sent according to described handover request request, for the IP address that described UE distribution is identical；
P-GW passes to 3GPPAAA server for being identified by the P-GW of himself with APN information, obtains authentication information from 3GPPAAA；
P-GW is used for sending session establishment response, and described IP address is sent to described UE, and described IP address is the UE IP address used when LTE accesses.
11. system according to claim 9, it is characterised in that UE is switched to Long Term Evolution LTE from WLAN WLAN, including:
Network element is for being issued to MME by switching instruction and user profile；
MME for receive UE attachment request after based on user IMSI insert switching instruction, change described attachment request into handover request；
MME is for being authenticated UE according to HSS, if certification success, MME performs location updating and subscription data acquisition process；
P-GW sends session establishment response for sending session establishment request according to MME, and described session establishment response includes UE and accesses the IP address used at WLAN.
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