CN101867986A

CN101867986A - CSFB function activating method and system thereof

Info

Publication number: CN101867986A
Application number: CN200910082476A
Authority: CN
Inventors: 熊春山
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2009-04-20
Filing date: 2009-04-20
Publication date: 2010-10-20
Anticipated expiration: 2029-04-20
Also published as: CN101867986B

Abstract

The invention discloses a CSFB function activating method and a system thereof, which can used for realizing the CSFB function using Femtocell to activate UE. The invention provides the CSFB function activating method which comprises the steps that a mobility management entity (MME) acquires an attach request message sent by the UE through the Femtocell; and the MME can confirm the CSFB function supported by the UE according to the attach request message sent by the UE, and activates the CSFB function of the UE by the attaching process of the UE.

Description

A kind of Activiation method of CSFB function and system

Technical field

The present invention relates to communication technical field, relate in particular to a kind of return circuit and exchange (CSFB, CSFallback) Activiation method of function and system.

Background technology

Because evolved packet system (EPS, Evolved Packet System) support circuit-switched (CS no longer, Circuit Switched) territory, therefore traditional voice class business based on the CS territory can not be directly supported in the EPS system, can only pass through IP Multimedia System (IMS, IP Multimedia Subsystem) and simulate the voice class business in traditional CS territory.

Return circuit exchange (CSFB, CS Fallback) technology is the CS territory of the utilization tradition 2G/3G system that proposes of third generation collaborative project (3GPP) technology provides CS territory business for the UE of EPS system a kind of method, particularly, as shown in Figure 1, when UE resided in the EPS system, if UE need use the business in CS territory, then UE used the CS territory of 2G/3G to initiate or receive CS territory business, simultaneously the carrying of EPS system is switched on packet switching (PS, the Packed Switched) territory of 2G/3G.When UE after CS territory business is finished in the CS territory of 2G/3G system, can return in the EPS system.

UE uses the CSFB function if desired, then must activate the CSFB function in advance, has at length defined the flow process that activates the CSFB function of UE in the TS23.272 standard.Behind the CSFB function activation, (the MSC of mobile switching centre, Mobile Switching Center)/and set up the related of SGs interface between VLR Visitor Location Register (VLR, Visitor Location Register) and the MME, promptly MSC/VLR and MME write down the other side's information such as IP address.

Be the activation that realizes the CSFB function by macro base station in the prior art, can't activate the CSFB function of UE by Home eNodeB.

Summary of the invention

The embodiment of the invention provides a kind of Activiation method and system of CSFB function, in order to realize activating by Home eNodeB the CSFB function of UE.

The Activiation method of a kind of CSFB function that the embodiment of the invention provides comprises:

Mobility Management Entity MME obtains adhering to of user equipment (UE) transmission by Home eNodeB and asks Attach Request message;

The Attach Request message that described MME sends by UE determines that this UE supports the CSFB function, and activates the CSFB function of described UE by the attaching process of UE.

A kind of communication system that the embodiment of the invention provides comprises:

Home eNodeB is used to receive and adhering to of user equipment (UE) transmission asks Attach Request message, and gives Mobility Management Entity MME with this Attach Request forwards;

Mobility Management Entity MME is used for obtaining the Attach Request message that UE sends by Home eNodeB, determines that by Attach Request message UE supports the CSFB function, and activates the CSFB function of this UE by the attaching process of UE.

A kind of subscriber equipment that the embodiment of the invention provides comprises:

CSFB function notification unit is used for adhering to request Attach Request message by sending to Home eNodeB, and the described subscriber equipment of informing network side is supported return circuit exchange CSFB function.

The embodiment of the invention, Mobility Management Entity MME obtains adhering to of user equipment (UE) transmission by Home eNodeB and asks Attach Request message; The Attach Request message that described MME sends by UE determines that this UE supports the CSFB function, and activates the CSFB function of described UE by the attaching process of UE, thereby has realized activating by Home eNodeB the CSFB function of UE.

Description of drawings

Fig. 1 is the schematic network structure of carrying out in the prior art under the CSFB process;

The UE that Fig. 2 provides for the embodiment of the invention inserts the schematic diagram of mobile operator network and local network by Home eNodeB;

The control UE that Fig. 3 provides for the embodiment of the invention inserts the overall procedure schematic diagram of local network;

The schematic diagram of the attaching process of the CSFB that Fig. 4 provides for the embodiment of the invention;

The schematic diagram of the Attach process that Fig. 5 provides for the embodiment of the invention;

The structural representation of a kind of communication system that Fig. 6 provides for the embodiment of the invention.

Embodiment

In the embodiment of the invention, possess the UE of CSFB function, be attached to by Home eNodeB in the process of EPS system, realize the activation of CSFB function, and this attaching process can also make that further UE is connected to local network.

The described local network of the embodiment of the invention is meant the home network or local internet (Internet) that link to each other with Home eNodeB (HeNB).

So-called home network, be meant the home network device that is connected with HeNB, for example: one or more home computer, the network printer, network video device, network cameras or the like, the local area network of forming by these home network devices is home network.

So-called local Internet network is meant the network that can be linked into Internet that is connected with HeNB.

As shown in Figure 2,, not only can activate the CSFB function of UE and be connected to the mobile operator network, can also be connected to home network or local Internet network by HeNB by HeNB by the technical scheme that the embodiment of the invention provides.

Referring to Fig. 3, the method for the activation of a kind of CSFB function that the embodiment of the invention provides totally comprises step:

S101, Mobility Management Entity MME adhere to request (Attach Request) message by what Home eNodeB obtained that user equipment (UE) sends.

The Attach Request message that S102, MME send by UE determines that this UE supports the CSFB function, and activates the CSFB function of this UE by the attaching process of UE.

Preferably, MME determines that UE supports that this method also comprises after the CSFB function:

MME obtains the information that the UE request inserts local network, and the information of the local network that request inserts according to UE, the indication Home eNodeB is set up local network for this UE carrying; Home eNodeB is according to the indication of MME, and by set up the radio bearer of local network for this UE, realization inserts local network with this UE.

Preferably, the MME step of obtaining the information of the local network that UE request inserts comprises:

MME obtains the information that the UE request inserts local network by the type of attachment Attach Type that carries in the described Attach Request message; Perhaps,

MME receives the connection request PDN Connectivity Request of the Packet Data Network message that Home eNodeB is transmitted, and the request type Request Type by carrying in this PDN Connectivity Request message, obtain the information that the UE request inserts local network; Perhaps,

MME is after having sent the session management information request ESM Information Request message of evolution to UE, the session management information response ESM Information Response message of the evolution of returning from UE, obtain the information of the local network that the UE request inserts.

Wherein, the UE that MME obtains by ESM Information Response message asks the information of the local network of access, asks the APN APN information of the local network of access for UE.

Preferably, the APN information of the MME local network that request inserts according to UE, the indication Home eNodeB comprises for the step that this UE is established to the carrying of local network:

The APN information of the described MME local network that request inserts according to UE, determine the type of the local network that the UE request inserts, and from a plurality of local networks of the type correspondence, being local network of this UE selection, the indication Home eNodeB is established to the carrying of this local network for this UE.

Provide concrete explaining below.

The embodiment of the invention will be used to activate the CSFB function of this UE and realize that the attaching process that UE is inserted local network is called CSFB Attach process.Referring to Fig. 4, the CSFBAttach process that the embodiment of the invention provides comprises step:

1, UE initiation attaching process, UE send by Home eNodeB and adhere to request (Attach Request) message to MME, comprise the information that UE supports the CSFB function in this message, and the information of the local network of UE request access, for example:

When the type of attachment in the Attach Request message (Attach Type) is that joint family/IMSI International Mobile Subscriber Identity (IMSI) is when adhering to (Combined Home/IMSI attach), " IMSI attach " expression UE informing network UE wherein supports the function in CS territory, and " Home " expression UE request wherein inserts home network." Combined Home/IMSI Attach " is meant that then UE supports the function in CS territory, and request access home network, that is to say that UE has the function of CSFB.

When Attach Type is that associating internet/IMSI is when adhering to (Combined Internet/IMSI Attach), " IMSI attach " expression UE informing network UE wherein supports the CSFB function, and " Internet " expression UE request wherein inserts local Internet network." Combined Internet/IMSI Attach " is meant that then UE supports the function in CS territory, and the local Internet network of request access, that is to say that UE has the function of CSFB.

This step 1 is made up of step 1 shown in Figure 5 and 2, and promptly UE sends Attach Request message to Home eNodeB, and Home eNodeB is transmitted this Attach Request message and given MME.

2, carry out EPS and adhere to (EPS Attach) process, this process comprises that step 3 shown in Figure 5 is to 11.

3, MME obtains VLR Visitor Location Register (VLR, Visitor Location Register) address (VLRNumber), and distributes a default location district sign (Default LAI).

4, MME sends position updating request (Location Update Request) message to VLR.

Comprise in this Location Update Request message: new Location Area Identification (new LAI), IMSI, MME address (MME address), position updating type (Location Update Type).MME address wherein is the IP address of MME.

5, the address of VLR store M ME, and create the SGs interface conjunctionn.

Wherein, SGs is the interface name between MME and the MSC/VLR.Described establishment SGs interface conjunctionn is meant between MME and MSC/VLR that for this reason UE sets up that signaling is connected and corresponding user's context.

6, VLR carries out the position updating process (Location Updating procedure) in CS territory.

7, VLR responds the position renewal to MME and accepts (Location Update Accept) message, wherein comprises the Temporary Mobile Subscriber Identity (TMSI) of VLR.

8, MME sends to UE and adheres to acceptance (Attach Accept) message.This step is made up of to 17 step 12 shown in Figure 5.

Comprise in the Attach Accept message: the parameter that defines in TS 23.401 standards, LAI, VLR TMSI.

Wherein, LAI obtains in step 3, and parameter L AI and VLR TMSI indication UE successfully are attached to the CS territory, have promptly realized the CSFB function of UE, have the function that returns to the CS territory.

Introduce the embodiment of the invention below in detail and how to realize that UE inserts local network by Home eNodeB.

When UE is attached to the EPS system by the HeNB that adopts the E-UTRAN access technology, requirement according to standard, UE need set up a Packet Data Network (PDN) and connect, if UE need be connected to local network at this moment, then to connect be to be connected to local network rather than traditional pairing PDN of SGi interface connects to the UE PDN that needs informing network self to set up.Because the pairing PDN of traditional SGi interface connects gateway (Serving GW) and the packet data network gateway (PDNGW) that needs to use in the core net, and local network is not need to use Serving GW in the core net and PDN GW.After UE was connected to local network, as shown in Figure 2, upstream data only was from UE to HeNB, arrives local network then; Downlink data from the local network to HeNB then to UE.

In the embodiment of the invention, the Attach process of initiating by UE realizes that UE inserts local network by Home eNodeB, and referring to Fig. 5, this Attach process specifically comprises step:

1, UE initiates attaching process, sends Attach Request message to HeNB.

Comprise in the Attach Request message: IMSI International Mobile Subscriber Identity (IMSI) or old global unique (user) temporary mark (GUTI, Globally Unique Temporary Identity), the tracking area identification (last visited TAI) (if available) of nearest visit, the core net ability of UE (UE Core Network Capability), the special discontinuous reception (DRX of UE, Discontinuous Reception) parameter, PDN type (PDN Type), protocol configuration option (Protocol Configuration Options), encrypted transmission selected marker (Ciphered Options Transfer Flag), type of attachment (Attach Type), key identification (KSIASME), Non-Access Stratum (NAS, Non-Access Stratum) sequence number (NAS sequence number), non-access layer information authentication code (NAS-MAC, Message Authentication Code), additional GUTI (additional GUTI).

Because the Attach process of TS24.301 standard and TS23.401 standard definition is different, definition according to the TS24.301 standard, the Attach process comprises two processes: only have the Attach process of mobile management sexual function, and UE request Packet Data Network connects (UE Request PDN Connectivity) process.

According to the definition of TS23.401 standard, if UE unites and adheres to, then the Attach Type in the Attach process adheres to (Combined EPS/IMSI Attach) for associating EPS/IMSI; If UE carries out adhering to of other type, then Attach Type adheres to (HandoverAttach) for initially adhering to (Initial Attach) or switching.If UE initially is linked into the EPS system, and the information of the UE local network that the UE request need be inserted, and UE supports the information of CSFB function to be notified to network, and then the set-up mode of AttachType is as follows:

If the type of the local network that UE request inserts is a home network, then Attach Type is set is that joint family/IMSI adheres to (Combined Home/IMSI attach) to UE.Wherein, " Home " indicated the information of the local network of UE request access; " IMSI " indicated UE to support the CSFB function.

If the type of the local network that UE request inserts is local Internet network, then UE is provided with Attach Type and adheres to (Combined Internet/IMSI Attach) for associating internet/IMSI.Wherein, " Internet " indicated the information of the local network of UE request access; " IMSI " indicated UE to support the CSFB function.

According to the definition of TS24.301 standard, in only having the Attach process of mobile management sexual function, if UE unites and adheres to, then Attach Type is Combined EPS/IMSI Attach; If UE carries out adhering to of other type, then Attach Type is for only being attached to EPS system (EPS Attach Only).In only having the UE Requested PDN Connectivity process of session management procedure, UE is in sending to Packet Data Network's connection request of MME (PDN Connectivity Request) message, and Request Type set-up mode is as follows:

When UE initially adhered to, Request Type was initial request (Initial Request).

When UE when non-3GPP access technology switches to the E-UTRAN access technology, Request Type is handoff request (Handover Request).

When the UE request inserted local network, Request Type was set to family request (Home Request) or the Internet request (Internet Request), in order to ask the information of the local network of access to be notified to network side UE.Promptly when Request Type was Home Request, the information of the local network that the UE request inserts was that the UE request inserts home network; When Request Type was Internet Request, the information of the local network that the UE request inserts was that the UE request inserts local internet.

That is to say, respectively according to the definition of TS23.401 standard and TS24.301 standard, the embodiment of the invention has provided the Attach Type in the Attach process, and have the Attach Type in the Attach process of mobile management sexual function and only have new corresponding relation between the RequestType in the UE Request PDN Connectivity process of conversation management functional, shown in following table 1, by the technical scheme that the embodiment of the invention provides, make substandard Attach Type of TS23.401 and the substandard Attach Type of TS24.301 and Request Type have following corresponding relation:

Table 1

Need to prove, " the Combined Home/IMSI Attach " that the embodiment of the invention provides, " Combined Internet/IMSI Attach ", " Home Request " and " Internet Request " are a kind of UE support CSFB function that is used for representing, and the specific names of the information of the local network of UE request access, can certainly adopt other specific names to represent that UE asks the information of the local network of access.

2, HeNB sends S1-MME interface control messages (S1-MME control message), wherein S1-MME interface is meant the control plane interface between HeNB and the MME, be that HeNB sends to new MME (new MME) with initial UE message (Initial UE message), include Attach Request message in this message.

The TS24.301 standard points out to include in the Attach Request message PDN Connectivity Request message, and MME can know that according to Attach Type in the Attach Request message and/or the Request Type among the PDN ConnectivityRequest UE will be linked in the local network of which type.Therefore, when the local network of the same type that HeNB connected only allows a network and allows the user insert, adhere to request (Attach Request) message and/or Packet Data Network's connection request (PDNConnectivity Request) message is only indicated the type of local network, which local network what network side just can know that the UE request inserts is.

3, new MME is to old MME or service universal packet wireless business affair (GPRS, General Packet Radio Service) service node (SGSN, Serving GPRS Support Node) (old MME/SGSN) sends identification request (Identification Request) message, after old MME or SGSN receive Identification Request message, reply identification response (Identification Response) message to new MME, wherein contain the IMSI of UE.

4, if new MME and old MME or SGSN all do not know this UE, then new MME sends identity request (Identity Request) message and gives UE, request UE provide its IMSI, after UE receives Identity Request message, reply identity response (Identity Response) message and give new MME, wherein contain the IMSI of UE.

5a, according to condition, new MME carries out authentication and security process (Authentication/Security).

5b, new MME obtain the mobile terminal identification of UE (ME Identity), and to equipment identity register (EIR, Equipment Identity Register) sends mobile terminal identification and examine request (ME Identity Check Request) message, the ME Identity and the IMSI that wherein comprise UE, after EIR receives this MEIdentity Check Request message, reply mobile terminal identification to new MME and verify and confirm (MEIdentity CheckAck) message, wherein contain verification result (Result).

6, if having carried to encrypt, UE selects metastatic marker (Ciphered Options Transfer Flag) in Attach request message, then after network activation is encrypted, new MME selects request (Ciphered Options Request) message (defining in the TS23.401 standard) by sending to encrypt, be that (this message defines in the TS24.301 standard message ESM Information Request (the session management information request of evolution), be equivalent to the Ciphered Options Request message that defines in the TS23.401 standard), to UE acquisition request protocol configuration option (PCO, protocol Configuration Options) information and/or APN (APN) information.After UE receives Ciphered Options Request message, reply to encrypt and select response (Ciphered Options Response) message (defining among the TS23.401), be that (this message defines in the TS24.301 standard message ESM Information Response (the session management information response of evolution), be equivalent to Ciphered Options Response message) give new MME, so that PCO and/or APN to be provided.

7, if new MME finds that this UE has the bearer context (active bearer contexts) of activation, then new MME sends deleting bearing request (Delete Bearer Request) message and gives relevant gateway (GW), the reason (Cause) and the Tunnel End Point Identifier (TEID that wherein contain deleting bearing, Tunnel End Point Identifier), in order to delete these bearer contexts, relevant gateway (GWs) is replied deleting bearing response (Delete Bearer Response) message and is given new MME, wherein contains Tunnel End Point Identifier (TEIDs).If strategy has been disposed with charging rule functions (PCRF, Policy and Charging Rules Function), then packet data network gateway (PDN GW) execution IP connects net conversation end (IP-CANSession Termination) process.

As seen, the effect of step 7 is when new MME and old MME are same MME, and new MME removed before UE adheres to that also not deleted EPS carries in the network.

8, new MME sends renewal position requests (Update Location Request) message to home signature user server (HSS, Home Subscriber Server).

Contain in the Update Location Request message: MME identifies (MME Identity), IMSI, ME Identity, MME ability (MME Capabilities), updating type (Update Type).

9, HSS sends canceling position (Cancel Location) message to old MME and old SGSN, comprising: IMSI and cancellation type (Cancellation Type).After old MME and old SGSN receive Cancel Location message, reply canceling position to HSS and confirm (Cancel Location Ack) message.

10, if old MME/SGSN finds that this UE has the bearer context (active bearer contexts) of activation, then old MME/SGSN sends deleting bearing request (Delete Bearer Request) message and gives relevant GW, in order to these bearer contexts of request deletion, comprising deletion reason (Cause) and TEID.Relevant GW receives after this Delete Bearer Request message, replys deleting bearing response (Delete Bearer Response) message and gives old MME/SGSN, wherein comprises TEID.If PCRF has been disposed, then PDN GW carries out IP-CAN Session Termination process.

11, HSS sends to new MME and upgrades location confirmation (Update Location Ack) message, wherein comprise IMSI and subscription data (Subscription data), include one or more (PDN of Packet Data Network among the described Subscription Data, Packet Data Network) signatory context (PDN subscription context), each PDN subscription context comprises an EPS subscribed QoS profile (EPS contract QoS archives) and the subscribed APN-AMBR (signatory APN (Access Point Name, Access Point Name) Aggregate Maximum Bit Rate (AMBR, Aggregated Maximum Bit Rate)).

To sum up, step 8-11 is the updating location information process, i.e. the old MME identification information that HSS deletion is stored, and add new MME identification information, promptly new MME is registered among the HSS as current mobile control and management entity node for the UE service.

12, new MME transmission is adhered to acceptance (Attach Accept) message to HeNB.

Comprise in the Attach Accept message: APN, GUTI, PDN Type, PDN address (PDNAddress), tracking area identification (TAI, Tracking Area Identity) tabulation (TAI List), EPS bearing identification (EPS Bearer Identity), session management request (Session Management Request), protocol configuration option (Protocol Configuration Options), key identification (KSIASME), NASsequence number, NAS-MAC.

Attach Accept message is included in the S1MME control message (S1-MME interface control messages), promptly is included in initial context and sets up in request (Initial Context Setup Request) message.This S1 control messages includes the up IP address and the TEID of the S1-U interface that EPS carrying that EPS Bearer Identity and gateway (Serving GW) identified for this EPS Bearer Identity distributed.

It is that the carrying that UE sets up is used for local network that MME need notify HeNB, because when HeNB receives that UE sends to the data of local network, HeNB can not be given to these data forward the gateway (Serving GW) in the core net, and is given to local network before wanting.If do not need to be given to local network, then HeNB receives when UE sends to the data of mobile operator network, is the Serving GW that is given to before wanting in the core net.

Therefore, new MME can set up request (Initial Context Setup Request) message by initial context asks the information of the local network of access to be notified to HeNB UE, is established to the radio bearer of local network for this UE with indication HeNB.

Because local network might be a home network, also may be local Internet network.In addition, also might be one or more home networks for home network, so the information that network side also needs UE to be linked into which concrete local network be notified to HeNB.

A network (comprising local network) can be identified by an APN, and therefore, the MME notice radio bearer that HeNB set up is can comprise for mode that a specific local network uses:

Mode 1:MME is provided with an APN and indicates concrete local network information in initial context foundation request (Initial Context Setup Request) message.

Mode 2: if HeNB can only be connected to one family network or a local Internet network at most, then MME can be provided with the indication information of a local network type in Initial Context Setup Request message, in order to the indication connection is home network or local Internet network, for example, represent home network with 0, with the local Internet network of 1 sign.

13, HeNB sends wireless resource control connection reconfiguration (RRC Connection Reconfiguration) message and gives UE, wherein comprise EPS radio bearer sign (EPS Radio Bearer Identity), and Attach Accept message is comprised in also in this RRC message and sends UE to.

14, UE sends wireless resource control connection reconfiguration and finishes (RRC Connection Reconfiguration Complete) message to HeNB.

So far, by step 13 and step 14, finished the foundation of the access local network radio bearer between HeNB and the UE.

15, HeNB sends initial context and response (Initial Context Response) message is set to new MME, wherein comprises the downstream IP address and the TEID of the S1-U interface (being the user plane interface between HeNB and the gateway Serving GW) of HeNB distribution.

To step 15, the radio bearer between UE and the local network has been finished foundation by step 12.Because the carrying between UE and the local network does not comprise the carrying of core net part, so in fact the carrying between UE and the local network is exactly the radio bearer between UE and the HeNB.

16, UE sends and directly transmits (Direct Transfer) message to HeNB, and this message comprises to adhere to finishes (Attach Complete) message.

Comprise in this Attach Complete message: EPS Bearer Identity, NAS sequence number, NAS-MAC.

17, HeNB preceding this Attach Complete message of changeing in up link NAS transmission (Uplink NAS Transport) message is given new MME.

After above-mentioned Attach process was finished, UE just can be connected to local network by HeNB, and communicated by the equipment in HeNB and the local network.

Introduce the APN that carries in the ESM Information Response message (or Ciphered Options Response message) in the above-mentioned step 6 shown in Figure 5 below in detail.

APN described in the embodiment of the invention, comprise four kinds of APN, be home network APN (H-APN) and the local point of presence title (I-APN) that defines in the APN that defines in the prior art, the embodiment of the invention, and the special-purpose APN of local network, comprise two kinds of special-purpose APN of home network and local the Internet-specific APN.

Wherein, can indicate the information (type information that comprises home network of the home network of UE request access with H-APN, and the information that is used to indicate concrete which home network), can indicate the information (comprise the type information of local internet, and be used to indicate the specifically information of which local internet) of the local internet of UE request access with I-APN.

Need to prove that " H-APN " and " I-APN " is a kind of specific sign, can certainly adopt other specific identifier, as " Home-APN " or " Internet-APN " etc.

The special-purpose APN of so-called local network is the fixing multicharacter APN of having of a kind of special definition, is used to indicate the type information of local network, comprises two types of special-purpose APN of home network and local the Internet-specific APN.

For example, when the special-purpose APN of local network was " Home Network.3gppnetwork.org ", the type of expression local network was a home network; When the special-purpose APN of local network was " Local Internet Network.3gppnetwork.org ", the type of expression local network was local internet.

Wherein, " Home Network.3gppnetwork.org " and " Local Internet Network.3gppnetwork.org " sign only is a kind of illustrating, and can also adopt other signs.

When the local network of the same type that HeNB connected only allows a network, the Attach Type that adheres in request (Attach Request) message is Combined Home/IMSI attach or Combined Internet/IMSI Attach, the Request Type that also can be provided with in Packet Data Network's connection request (PDN Connectivity Request) message is Home Request or Internet Request, thereby type by the indication local network, the local network that indication UE request inserts, at this moment, the information of the APN that carries in session management information response (ESM Information Response) message of evolution can be ignored, and disregards.

But, when the local network of the same type that HeNB connected allows a plurality of networks, when allowing same subscriber equipment to insert the one or more local network of same type, then the APN indication of carrying in the session management information of evolution response (ESM Information Response) message is which local network under this type.And this APN can be defined APN in the prior art, or the H-APN that defines in the embodiment of the invention, I-APN or the special-purpose APN of local network, identifies the specifying information of the local network of UE request access.

Need to prove that if UE do not provide APN, or the APN that provides is wildcard APN (being wildcard, " * "), illustrate that then UE only provides the type information of the local network that request inserts, so MME can select the local network an of the type for UE.For example: the H-APN that UE provides is wildcard, i.e. " * ", then MME can select the one family network for UE, and perhaps, the I-APN that UE provides is wildcard, i.e. " * ", then MME can select a local internet for UE.

Provide in the embodiment of the invention explanation below about four kinds of applicable cases of APN.

Situation one: when the local network of the same type that HeNB connected only allows a network, and (UE can insert two types network simultaneously when allowing same subscriber equipment can only insert a local network for a type, but every type can only be inserted a network), if the Attach Type that adheres in request (Attach Request) message is Combined EPS/IMSI Attach, or the Request Type in Packet Data Network's connection request (PDN Connectivity Request) message is Initial Request, be that UE does not indicate the information that is linked into local network in these two message, then the APN in the session management information of evolution response (ESM Information Response) message is H-APN or I-APN, perhaps can also be the special-purpose APN of local network.

In this case, the special-purpose APN of H-APN or I-APN or local network is directly corresponding to the local network of respective type.

Situation two: when the local network of the same type that HeNB connected allows a plurality of networks, but when allowing same subscriber equipment can only insert a local network for same type, if the Attach Type that adheres in request (Attach Request) message is Combined EPS/IMSI Attach, or the Request Type in Packet Data Network's connection request (PDN Connectivity Request) message is Initial Request, the concrete local network under the APN indication this type that then needs to carry in session management information response (the ESM Information Response) message by evolution.The APN of this moment can be H-APN, I-APN or the special-purpose APN of local network.Wherein, if the APN that carries in the ESM Information Response message only provides the type information of local network, H-APN that promptly provides or I-APN are wildcard (i.e. " * "), perhaps provide the special-purpose APN of local network, then MME can select a local network for UE in respective type.

Situation three: when the local network of the same type that HeNB connected allows a plurality of networks, and (UE can insert the local network of a plurality of types simultaneously when allowing subscriber equipment to insert a plurality of local network of same type, and the local network for each type can insert a plurality of), if the Attach Type that adheres in request (Attach Request) message is Combined Home/IMSI Attach or Combined Internet/IMSI Attach, perhaps the Request Type in Packet Data Network's connection request (PDN Connectivity Request) message is Home Request or Internet Request, promptly indicated the type of local network, then in the session management information of evolution response (ESM Information Response) message the APN indication be concrete local network under this type.The APN that carry in the ESM Information Response message this moment can be the APN that defines in the prior art, or H-APN that defines in the embodiment of the invention or I-APN.Wherein, if H-APN or I-APN that UE provides are wildcard, i.e. " * ", then MME can select the local network of a respective type for UE.

Situation four: when the local network of the same type that HeNB connected allows a plurality of networks, and when allowing subscriber equipment to insert a plurality of local network of same type, if the Attach Type that adheres in request (Attach Request) message is Combined EPS/IMSI Attach, or the Request Type in Packet Data Network's connection request (PDN Connectivity Request) message is Initial Request, be that UE does not indicate the information that is linked into local network in these two message, then carry the type information that APN should indicate the local network that the UE request inserts in the session management information of evolution response (ESM Information Response) message, also will indicate is which local network under this type.Therefore, in this case, the APN that carries in the ESM Information Response message is the special-purpose APN of H-APN, I-APN or local network.Wherein, if the APN that carries in the ESM Information Response message only provides the type information of local network, H-APN that promptly provides or I-APN are wildcard (i.e. " * "), perhaps provide the special-purpose APN of local network, then MME can select a local network for UE in respective type.

To sum up, the APN that carries in the ESM Information Response message, with the Attach Type that carries in the Attach Request message, and the Request Type that carries in the PDN Connectivity Request message may make up shown in following table 2 under the situation that activates CSFB:

Table 2

Wherein, the nothing described in the table 2 (APN) is not promptly carried APN in the ESM Information Response message.

In order to express local access point title H-APN and I-APN,, need the form of definition H-APN and I-APN with the difference of existing radio area network APN (W-APN) and APN.

The formation rule of H-APN and I-APN is as follows:

H-APN can be made up of two parts content:

First, the network identity (The H-APN NetworkIdentifier) of the home network that the UE request inserts, this part is essential.

Second portion, the sign (The H-APN Operator Identifier) of the pairing public land mobile net of home network (PLMN, public land mobile network) that the UE request inserts, the i.e. sign of operator.This part is optional.

HeNB can link to each other with a plurality of PLMN simultaneously.

The form of The H-APN Operator Identifier is: " h-apn.epc.mnc＜MNC〉.mcc＜MCC〉.3gppnetwork.org ".

Wherein, character mark " mnc " and " mcc " represent thereafter＜MNC〉with＜MCC numeral be respectively mobile network code (MNC, Mobile Network Code) and Mobile Country Code MCC (Mobile Country Code).MCC is made up of three numerals (three digits), as 345.And the length of MNC is three numerals or two-digit (two or three digits), and they have all done detailed explanation in the TS23.003 standard.

For example, when MCC is 345, MNC is 12 o'clock, and then The H-APN Operator Identifier is " h-apn.epc.mnc012.mcc345.3gppnetwork.org ".

In like manner, I-APN also can be made up of two parts content:

First, the network identity (The I-APN Network Identifier) of the local internet that the UE request inserts, this part is essential.

Second portion, the sign (The I-APN Operator Identifier) of the pairing public land mobile net in local internet (PLMN, public land mobile network) that the UE request inserts, the i.e. sign of operator.This part is optional.

If do not comprise the sign of the pairing public land mobile net of local network in the local access point title (H-APN or I-APN), then network side can't be distinguished local access point title and existing APN, because not comprising the local access point title of the sign of public land mobile net is the same with the form of APN, the difference of having no idea.

APN in the coded format in the message shown in following table 3:

Table 3

For traditional APN, corresponding to the value of Access point name IEI, and the embodiment of the invention has proposed H-APN and I-APN, therefore will increase the value number of Access point name IEI, to represent H-APN and I-APN respectively.

For example, when Access point name IEI=51, the APN that defines in the expression prior art (also representing the special-purpose APN of the local network that defines in the embodiment of the invention); When Access point name IEI=52, expression H-APN; When Access point name IEI=53, expression I-APN.

This shows that different with H-APN and I-APN is that the special-purpose APN of local network need not to revise parameter A ccess point name IEI, promptly need not to revise agreement, and only need revise the parameter preparation of terminal and network, and is therefore more easy.The special-purpose APN of local network is applicable to whole 3GPP standard, is used to identify the type of local network.

Therefore, what network side just can be known access that UE asked this moment by the value of Access point name IEI is home network or local internet, or the mobile operator network.

Obviously, the H-APN and the I-APN of signatory home network can be asterisk wildcard (Wild card) among the HSS, and promptly H-APN that stores among the HSS and I-APN are " * ".

To sum up, in the embodiment of the invention in the process of the CSFB function that activates UE by CSFB Attach process, UE can carry H-APN or I-APN or the special-purpose APN of local network that defines in the APN that defines in the prior art or the embodiment of the invention by ESM Information Response message, insert the information of local network with indication UE request, thereby UE can be linked into local network.

The following describes the system that the embodiment of the invention provides.

Referring to Fig. 6, a kind of communication system that the embodiment of the invention provides comprises:

Home eNodeB 10 is used to receive and adhering to of UE 20 transmissions asks Attach Request message, and gives Mobility Management Entity MME 30 with this Attach Request forwards.

Mobility Management Entity MME 30, be used for obtaining the Attach Request message that UE 20 sends by Home eNodeB 10, determine that by Attach Request message UE 20 supports the CSFB function, and activate the CSFB function of this UE 20 by the attaching process of UE 20.

Preferably, described MME 30 comprises:

Information acquisition unit 31 is used to obtain the Attach Request message that UE 20 sends, and obtains type of attachment Attach Type from AttachRequest message, and according to the indication of described Attach Type, determines that this UE 20 supports the CSFB functions.

Activate unit 32, be used for activating the CSFB function of the UE 20 that supports the CSFB function by the attaching process of UE 20.

Preferably, described information acquisition unit 31 also is used to obtain the information that UE 20 requests insert local network.Described MME 30 also comprises:

Indicating member 33 is used for the information according to the local network of UE 20 request accesses, the carrying that indication Home eNodeB 10 is set up local network for this UE 20.

Preferably, described information acquisition unit 31, by the type of attachment Attach Type that carries in the Attach Request message, the perhaps request type Request Type that carries in the connection request PDNConnectivity Request of the Packet Data Network message of transmitting by Home eNodeB 10, perhaps pass through the session management information response ESM Information Response message of the evolution of UE 20 transmissions, obtain the information of the local network of UE 20 request accesses.

Preferably, described information acquisition unit 31, the information of the local network that UE 20 requests of obtaining by ESM Information Response message insert, the APN APN information of the local network that inserts for UE 20 requests.

Described Home eNodeB 10 comprises:

Retransmission unit 11 is used to receive the Attach Request message that UE 20 sends, and gives MME 30 with this AttachRequest forwards.

Unit 12 is set up in carrying, be used for according to described MME 30 send for UE 20 sets up the indication of the carrying of local network, be established to the radio bearer of local network for this UE 20.

Data Transmission Controlling unit 13, being used for setting up unit 12 by carrying is the radio bearer that this UE 20 is established to local network, control data transmits between the local network of UE 20 and this UE 20 request accesses.

Preferably, described UE 20 comprises:

CSFB function notification unit 21 is used for adhering to request Attach Request message by sending to Home eNodeB 10, and the described subscriber equipment 20 of informing network side is supported return circuit exchange CSFB function.

Request inserts local network element 22, be used for by Attach Request message or the connection request PDN Connectivity Request of Packet Data Network message, or the session management information of evolution response ESMInformation Response message, the information that described subscriber equipment 20 requests are inserted local network sends to Home eNodeB 10.

Data transmission unit 23 is used for the control according to Home eNodeB 10, is the radio bearer that described subscriber equipment 20 is set up local network by Home eNodeB 10, realizes the transfer of data with local network.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1. the Activiation method of return circuit exchange CSFB function is characterized in that this method comprises:

2. method according to claim 1 is characterized in that, the Attach Request message that described MME sends by UE determines that this UE supports the step of CSFB function to comprise:

Described MME obtains type of attachment Attach Type from the Attach Request message that UE sends, and according to the indication of described Attach Type, determines that this UE supports the CSFB function.

3. method according to claim 1 is characterized in that, described MME determines that this UE supports that this method also comprises after the CSFB function:

MME obtains the information that the UE request inserts local network, and the information of the local network that request inserts according to UE, the indication Home eNodeB is set up local network for this UE carrying;

Described Home eNodeB is according to the indication of described MME, and by set up the radio bearer of local network for this UE, realization inserts local network with this UE.

4. method according to claim 3 is characterized in that, the step that described MME obtains the information of the local network that UE request inserts comprises:

MME receives the connection request PDN Connectivity Request of the Packet Data Network message that Home eNodeB is transmitted, and the request type Request Type by carrying in this PDN Connectivity Request message, obtain the information that the UE request inserts local network.

5. method according to claim 3 is characterized in that, described UE asks the information of the local network of access, asks the APN APN information of the local network of access for UE;

The step that described MME obtains the information of the local network that UE request inserts comprises:

MME is after having sent the session management information request ESM Information Request message of evolution to UE, the session management information response ESM Information Response message of the evolution of returning from UE, obtain the APN information of the local network that the UE request inserts.

6. method according to claim 5 is characterized in that, the information of the described MME local network that request inserts according to UE, and the indication Home eNodeB comprises for the step that this UE is established to the carrying of local network:

7. according to claim 5 or 6 described methods, it is characterized in that described APN is home network APN, local internet APN, the special-purpose APN of home network or local the Internet-specific APN.

8. method according to claim 7 is characterized in that, when described APN was home network APN or local internet APN, the APN information of described local network comprised:

The network identity of the local network that the UE request inserts; Perhaps,

The PLMN sign of the network identity of the local network that the UE request inserts and the public land mobile net of this local network correspondence.

9. method according to claim 7, it is characterized in that, when described APN is home network APN or local internet APN, if be used to identify the value of the source identity IEI of APN type in the APN information of described local network, when being used to represent that the UE request inserts the value of home network, described MME determines that the UE request inserts home network; If the value of described IEI, when being used to represent that the UE request inserts the value of local internet, described MME determines that the UE request inserts local internet.

10. a communication system is characterized in that, this system comprises:

11. system according to claim 10 is characterized in that, described MME comprises:

Information acquisition unit is used to obtain the Attach Request message that UE sends, and obtains type of attachment Attach Type from Attach Request message, and according to the indication of described Attach Type, determines that this UE supports the CSFB function;

Activate the unit, be used for activating the CSFB function of the UE that supports the CSFB function by the attaching process of UE.

12. system according to claim 11 is characterized in that, described information acquisition unit also is used to obtain the information that the UE request inserts local network;

Described MME also comprises:

Indicating member is used for the information according to the local network of UE request access, the indication Home eNodeB is set up local network for this UE carrying.

13. system according to claim 12, it is characterized in that, described information acquisition unit, by the type of attachment Attach Type that carries in the described Attach Request message, the perhaps request type Request Type that carries in the connection request PDN Connectivity Request of the Packet Data Network message of transmitting by Home eNodeB, the perhaps session management information response ESM Information Response message of the evolution that sends by UE is obtained the information of the local network that the UE request inserts.

14. system according to claim 13, it is characterized in that, described information acquisition unit, the information of the local network that the UE that obtains by described ESM Information Response message request inserts, the APN APN information of the local network that inserts for the UE request.

15. system according to claim 12 is characterized in that, described Home eNodeB comprises:

Retransmission unit is used to receive the Attach Request message that UE sends, and gives MME with this Attach Request forwards;

The unit is set up in carrying, be used for according to described MME send for UE sets up the indication of the carrying of local network, be established to the radio bearer of local network for this UE;

The Data Transmission Controlling unit is used for by described radio bearer, and control data transmits between the local network of UE and this UE request access.

16. a subscriber equipment is characterized in that, described subscriber equipment comprises:

17. subscriber equipment according to claim 16 is characterized in that, described subscriber equipment also comprises:

Request inserts local network element, be used for by described Attach Request message or the connection request PDN Connectivity Request of Packet Data Network message, or the session management information of evolution response ESMInformation Response message, the information that described user equipment requests is inserted local network sends to Home eNodeB;

Data transmission unit is used for the control according to Home eNodeB, is the radio bearer that described subscriber equipment is set up local network by Home eNodeB, realizes the transfer of data with local network.