CN101374258B - System for implementing network backward compatibility, and adherence, de-adherence method - Google Patents

Abstract

The invention discloses a system for achieving network backward compatibility, which comprises a policy and charging rule function entity PCRF, a home subscriber server HSS, an evolved mobile switch center EMSC and an evolved media gateway EMGW. The invention also discloses an adhesion method, which comprises the following steps: transmitting an adhesion request message by a UE to a target MME, and transmitting an updated position confirmation message to the target MME by the HHS after the target MME executes authorization and position updating according to the service state of the UE; acquiring the address information of a target eMSC by the UE, and initially adhering on the target eMSC; and updating a tracking region and the position of the UE if the MME and the eMSC for providing the service change, and reattaching to a new target MME and a new eMSC. The invention also discloses a de-adhesion method. According to the invention, circuit domain service can be continuously used in an evolved network, and backward compatibility can be achieved, thereby maximally utilizing entities in the conventional circuit domain, ensuring smooth transition of system upgrading and protecting the present investment of operators.

Description

A kind of system that realizes network backward compatibility with adhere to, de-adherence method

Technical field

The present invention relates to the 3G (Third Generation) Moblie technology, particularly a kind of system that realizes network backward compatibility with adhere to, de-adherence method.

Background technology

At present, along with development of Communication Technique, the 3G (Third Generation) Moblie technology reaches its maturity.UMTS (Universal Mobile Telecommunications System; UTMS) be to adopt WCDMA to insert (Wideband Code Division Multiple Access; WCDMA) 3-G (Generation Three mobile communication system) of air interface technologies, this system have adopted and the similar structure of second generation GSM, comprise Radio Access Network (Radio Access Network; RAN) and core network (Core Network, CN).Wherein, RAN is used to handle all and wireless traffic function associated, and CN handles that all voice calls are connected with data in the UTMS system, and the exchange of realization and external network and routing function.CN is from be divided into circuit commutative field (Circuit SwitchedDomain, CS territory) and packet-switched domain (Packet Switched Domain, PS territory) in logic.Land radio access web (UMTS Territorial Radio Access Network, UTRAN), (User Equipment UE) has constituted whole UMTS system together for CN and subscriber equipment.

The above-mentioned network architecture is based on the framework of the version before the 3GPP Rel6; Consider the competitiveness of future network; 3GPP is studying a kind of brand-new evolution network framework to satisfy following 10 years or mobile network's application demand in the longer time, and (System ArchitectureEvolution is SAE) with Long Term Evolution (the Long Term Evolution of Access Network to comprise System Architecture Evolution; LTE), wherein the Access Network of evolution is called Evolved-UTRAN (E-UTRAN).The target of network evolution be a kind of low time delay, high data rate, high power system capacity and coverage rate, low cost can be provided, fully based on Internet protocol (Internet Protocol, network IP).

In 3GPP, each manufacturer is all at active research SAE, LTE at present, and the LTE purpose provides a kind of time delay, raising user data rate, power system capacity and coverage rate of can reducing and is able to improved network cheaply.Therefore; At UMTS in the process of SAE evolution; With the stage that has two kinds of networks of UMTS and SAE and deposit, the evolution network framework of stipulating among the TS23.401-v110 in the 3GPP standard is as shown in Figure 1, and the related Sections that the annexation between each module sees for details in the 3GPP standard is described; Only just carry out brief account here with the function of correlation module of the present invention, comprising:

(Serving Gateway, S-GW) 101 is entities of the UE termination downlink data of idle state to gateway, triggers paging and preserves the contextual information of UE simultaneously, like the IP address of UE and routing iinformation etc.

Packet data network gateway (Packet Data Network Gateway, PDN GW) the 102nd, the anchor point of user plane remains unchanged in user's Session Time section; Simultaneously, (Policy and Charging Enforcement Function PCEF) also is positioned on this entity for strategy and charge execution function.

"Policy and Charging Rules Function entity (Policy and Charging Rules Function; PCRF) 103, be used for generation strategy and the control of chargeing (Policy and Charging Control, PCC) rule and it is issued on the PCEF; And carried out by PCEF should rule; Under the network architecture shown in Figure 1, be PCRF 103 with rule downloading to PDN GW102, and carried out by it should rule.

Home subscriber server (Home Subscriber Server, HSS) 105, be used to support the user to register and deposit user identity, position data and filtering policy information, and carry out the management of the authentication and authorization control information of network insertion for the user.

Mobility Management Entity (Mobility Management Entity, MME) 104, be used to preserve the MM Context of UE, like user's sign, mobility status, tracking area (TrackingArea, TA) information etc., and the user carried out authentication.

MME104 through S3 interface and service GPRS support node (Serving GPRS SupportNode, SGSN) continuous, 2G/3G user can pass through UTRAN/GERAN (GSM/EDGE RadioAccess Network, GSM EDGE Radio Access Network; GSM:Global system for mobilecommunications, global system for mobile communications; EDGE:Enhanced data rates for GSMevolution, the enhanced data rates of GSM evolution) insert SGSN, evolution network framework is compatible 2G/3G, this mainly is the smooth evolution for system.Cover because can only carry out the focus of E-UTRAN at the initial stage of arranging net of evolvement network, beyond hot spot coverage, the user can only be linked into network through UTRAN/GERAN.

Therefore; In this case; Will inevitably relate to UE and move and the switching problem of initiation in the evolvement network overlay area and between the 2G/3G network, also just require network in territory and wireless access technology (RadioAccess Technology, the professional continuity of assurance when RAT) changing.

By above visible, evolvement network also is an important techniques index for the height of the backward compatibility ability of existing network.For existing investment and the equipment of protecting operator; And utilize the entity of traditional circuit domain to greatest extent; At present 3GPP has proposed a kind of scheme of in evolvement network PS territory, carrying CS numeric field data, signaling, this scheme be called as at present evolution mobile switching centre (evolved Mobile SwitchingCenter, eMSC); And in the TR23.882 of 3GPP standard, this has been carried out special discussion; And propose: in LTE/SAE, adopt controlled entity eMSC to control the business that inserts the zone from difference, thereby the problem of business continuance between CS territory and LTE/SAE is oversimplified; While voice and parallel I P IP multimedia subsystem, IMS (IP Multimedia Sub-system; IMS) realizing by the terminal alternately of session, and advised new interface, provided the suggestion of principle; But the framework details that does not relate to the eMSC scheme at present in the standard; Simultaneously for the various related business processes under this framework, be attached to details and the attachment removal details of mobile management under the details, idle state of eMSC etc. like: UE, do not relate to yet.

Can know by the above; Prior art and unresolved evolvement network are for the backwards compatibility problem of UMTS network; The continuity of business in the time of can't realizing keeping UE between evolvement network and 2G/3G network, to move; Also can't realize various corresponding business flow processs, be attached to mobile management and attachment removal etc. under eMSC, the idle state such as UE, and this will certainly have influence on the deployment of carrier network and the use of customer service.

Summary of the invention

Embodiments of the invention provide a kind of system that realizes network backward compatibility, make UE can in evolvement network, continue to use traditional circuit domain professional.

Embodiments of the invention also provide the method for a kind of eMSC of being attached to, make UE can insert the system of said network backward compatibility smoothly.

Embodiments of the invention also provide the method for carrying out the UE attachment removal in a kind of system of network backward compatibility, make UE when not using, from the system of said network backward compatibility, to nullify smoothly.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of system that realizes network backward compatibility comprises: "Policy and Charging Rules Function entity PCRF, home subscriber server HSS, the EMSC of evolution mobile switching centre and evolution WMG EMGW;

PCRF is used to receive the application layer conversation information of being sent by EMSC, works out corresponding strategy and charging regulation according to said application layer conversation information;

EMSC is used for confirming UE from HSS request user profile and by said user profile, and receives the chain of command signaling of this UE that the control messages that said chain of command signaling is converted into based on circuit domain sends to EMGW;

HSS is used to deposit user profile;

EMGW is used for according to said control messages based on circuit domain, with bearer service from converting to based on circuit domain based on packet domain.

A kind of method that is attached to eMSC comprises:

UE sends Attach Request message to target MME, and target MME sends renewal position acknowledge message by HSS to target MME after carrying out authentication, position renewal according to the UE service condition; UE obtains target eMSC address information, initially is attached to target eMSC; If provide the said MME and the eMSC of service to change, then UE carries out tracking area update and position renewal, and reattachment is to new target MME and eMSC.

A kind of method of UE attachment removal comprises:

MME is to the carrying between the PDN GW in the UE deletion, sends the IMSI detach request by MME to eMSC/VLR then, and eMSC/VLR receives said IMSI detach request, deletes the link information of eMSC/VLR to MME, and sends the IMSI attachment removal to MME and accept message.

Visible by above-mentioned technical scheme; The present invention passes through moving exchanging center MSC and the media gateway MGW in the traditional circuit domain after the introducing evolution in evolvement network; Realize in evolvement network, continuing to use the function of traditional circuit domain business, made that the packet domain user in the evolvement network can communicate with the traditional circuit domain user, therefore realized good backwards compatibility; Simultaneously through adhere to, the method for attachment removal; Make the user in evolvement network and legacy network, to switch, realized utilizing to a greater extent the traditional circuit domain entity, guarantee the existing investment that has seamlessly transitted and protected operator of system upgrade.

Description of drawings

Fig. 1 is that evolvement network is formed structural representation in the prior art.

Fig. 2 forms structural representation for the network of first kind of network architecture when UE is positioned at home network in the preferred embodiment of the present invention.

Fig. 3 forms structural representation for the network of first kind of network architecture when UE is positioned at visited network and customer service Local Breakout (local break-out) in the preferred embodiment of the present invention.

Fig. 4 forms structural representation for the network of first kind of network architecture when UE is positioned at visited network and customer service Home-Routed (route returns and belongs to network) in the preferred embodiment of the present invention.

Fig. 5 forms structural representation for the network of second kind of network architecture when UE is positioned at home network in the preferred embodiment of the present invention.

Fig. 6 forms structural representation for the network of second kind of network architecture when UE is positioned at visited network and customer service Local Breakout in the preferred embodiment of the present invention.

Fig. 7 forms structural representation for the network of second kind of network architecture when UE is positioned at visited network and customer service Home-Routed in the preferred embodiment of the present invention.

Fig. 8 forms structural representation for the network of the third network architecture in the preferred embodiment of the present invention when UE is positioned at home network.

Fig. 9 forms structural representation for the network of the 4th kind of network architecture when UE is positioned at home network in the preferred embodiment of the present invention.

Figure 10 is attached to the schematic flow sheet of evolvement network for UE in the prior art.

Figure 11 is signaling bear and the schematic flow sheet that is attached to eMSC through the connectedness of IP aspect with the default bearer for UE in the preferred embodiment of the present invention.

Figure 12 is signaling bear and the schematic flow sheet that is attached to eMSC through the connectedness of IP aspect with the dedicated bearing for UE in the preferred embodiment of the present invention.

Figure 13 is for reporting the ability of self CSoPS by UE under the associating adhering mode in the preferred embodiment of the present invention and being attached to the schematic flow sheet of eMSC.

Figure 14 is for reporting the ability of self CSoPS by network under the associating adhering mode in the preferred embodiment of the present invention and being attached to the schematic flow sheet of eMSC.

Figure 15 is for being attached to the schematic flow sheet of eMSC in the preferred embodiment of the present invention through the PCC mode.

Figure 16 is for upgrading the schematic flow sheet of reattachment to new eMSC through co-location in the preferred embodiment of the present invention.

Figure 17 is for passing through the schematic flow sheet of the connective reattachment of IP aspect to new eMSC in the preferred embodiment of the present invention.

Figure 18 is the schematic flow sheet of the associating attachment removal mode initiated by UE in the preferred embodiment of the present invention.

Figure 19 is for passing through the schematic flow sheet that IP aspect connectedness is carried out attachment removal by what UE initiated in the preferred embodiment of the present invention.

Figure 20 in the preferred embodiment of the present invention in the PS territory operation CS professional and contain the chain of command protocol stack structure sketch map of IP Sec layer when carrying out Signalling exchange through IP connectivity.

Figure 21 in the preferred embodiment of the present invention in the PS territory operation CS professional and do not have the chain of command protocol stack structure sketch map of IP Sec layer when carrying out Signalling exchange through IP connectivity.

Figure 22 is for containing the structural representation of the user face protocol stack of IP Sec layer in the preferred embodiment of the present invention when operation CS is professional in the PS territory.

Figure 23 is not for there being the structural representation of the user face protocol stack of IP Sec layer in the preferred embodiment of the present invention when operation CS is professional in the PS territory.

Embodiment

The embodiment of the invention is through proposing concrete eMSC architectural schemes; Make that business continuance can be maintained when UE moved between evolvement network and 2G/3G network; Thereby can implement various corresponding business flow processs; And guarantee to carry CS territory professional (CS over PS is called for short CSoPS) through the PS territory.Use this programme to increase a new functional entity eMSC, and after UE supported the upgrading of CSoPS, then UE and network side can be supported the CSoPS ability, thereby can ensure UE business continuance when mobile between evolvement network and 2G/3G network at network side.

Wherein, several kinds of network architectures below the evolvement network behind the introducing eMSC entity can adopt:

Embodiment one

Fig. 2 shows the network of first kind of network architecture when UE is positioned at home network and forms structure, comprising:

PDN GW202, PCRF203, EMSC204, EMGW205 (evolVed Media GateWay; The WMG of evolution), HSS206, S-GW207, MME209 and SGSN208; Wherein EMSC204 further comprises eMGCF2041 module and eMSC/VLR2042 module, and EMGW205 further comprises eIM-MGW2051 module and eMGW2052 module.

Wherein, UE201 links to each other with eMSC/VLR2042 among the EMSC204 through interface L1, this interface in order to the CS chain of command signalings such as registration, position renewal, mobile management and voice call control signaling of simulating the CS territory alternately.

EMSC204 links to each other with HSS206 through interface C; Be used for from CS territory relevant informations such as HSS206 request user identity, position data and filtering policy information; Pass through the voice call control signaling that interface L1 sends according to what receive by UE201 simultaneously; Transmit control message to eIM-MGW2051 through Mn, comprise in this message Codec type of service, UE medium face parameter, carry bit rate etc.; Bearer service request according to UE; Trigger PCRF203 through interface Rx+ and set up guarantee bit rate (Guaranteed Bit Rate; GBR) carry; Medium face data to realize audio call guarantee from UE to the QoS PDN GW, in addition, are that PCRF203 works out strategy and charging control rule provides other application layer conversation information through the Rx+ interface also; Be outbound call if call out; Then EMSC204 is through ISUP/BICC interface and opposite end entity interaction call signaling; Calling out else if is office call, and then eMSC204 is through Iu-CS/A interface and the mutual call signaling of access network entity (this kind situation is not shown in the drawings).EMSC204 further comprises eMGCF2041 module and eMSC/VLR2042 module; EMGCF2041 is used for controlling the eIM-MGW2051 module of EMGW205 entity and code/decode format conversion that the eMGW2052 module is carried out Media Stream; EMSC/VLR2042 passes through the voice call control signaling that interface L1 sends according to what receive by UE201, carries out the associative operation of medium face through Mc interface control eMGW2052.

EMGW205 is the WMG of evolution; Can be divided into eIM-MGW2051 module and eMGW2052 module according to function; Both are respectively PS territory logic module and CS territory logic module; This entity externally links to each other with CS territory entity with PS territory entity respectively, internally, links to each other through internal interface Nc between two logic modules.EIM-MGW2051 is through SGi interface and PDN GW202 interactive media face data; Be outbound call if call out, then eMGW2052 is through Nb interface and opposite end entity interaction medium face data, and calling out else if is office call, and then eMGW2052 is through Iu-CS/A interface and access network entity interactive media face data (not shown this situation); When carrying out medium face data mutual through internal interface Nb between eIM-MGW2051 and the eMGW2052; Need medium face data be done a conversion between PS territory medium face data and CS territory medium face data; That is: eIM-MGW2051 will convert CS territory medium face data into when eMGW2052 sends medium face data; Otherwise eMGW2052 will convert PS territory medium face data into when eIM-MGW2051 sends medium face data.

PCRF203 links to each other with eMSC204 through the Rx+ interface; Be used to receive the various application layer conversation information that EMSC204 issues; And then current ongoing applied business of the restriction, the user that obtain user access network and user signing contract information etc.; Work out corresponding strategy and charging regulation then, and the rule that will work out issues PDN GW202 execution through the S7 interface.

PDN GW202 links to each other with PCRF203 through the S7 interface, receives the rule that is issued by the PCRF203 formulation and also carries out, and sets up required medium face and carries; Link to each other with eIM-MGW2051 through the SGi interface, be used for the customer traffic in the PS territory is filtered and sends to eIM-MGW2051; Link to each other with S-GW207 through the S5 interface.

S-GW207 is the gateway of evolvement network; MME209 is the core network control surface entity of evolvement network; SGSN208 is 2G/3G server network control surface entity and has the function of user entity; This three entity functions and description is all arranged with the interface of adjacent entities in existing standard, this place repeats no more.

Shown in Figure 3 is that the network of first kind of network architecture when UE is positioned at visited network and customer service LocalBreakout formed structure; Under this scene; HSS306 is positioned at home network; All the other all modules are the functional entity that is arranged in visited network, and wherein the each several part annexation is all said identical with Fig. 2 with function, repeats no more here.

Shown in Figure 4 is that the network of first kind of network architecture when UE is positioned at visited network and customer service Home-Routed formed structure; Under this scene; HSS406 and PDN GW402 are positioned at home network; Also comprise the H-PCRF4031 in the home network in the network, the V-PCRF4032 in H-PCRF4031 and the visited network is through interface S9 communication, and all the other all entities are the functional entity that is arranged in visited network; And wherein the each several part annexation is all said identical with Fig. 2 with function, repeats no more here.

Can draw from above description, first kind of network architecture has following characteristics:

1, this framework has been introduced new functional entity eMSC; It has the function of circuit domain tradition MSC-Server; Also possesses interface simultaneously with the PCC system; Therefore its function class is similar to agent call server controls function in the IMS territory (Proxy Call ServerControl Function P-CSCF), can trigger through the Rx+ interface and set up proprietary GBR and carry (the professional packet domain of analog circuit domain is carried); In order to the voice calls Media Stream, ensure thereby make voice flow obtain QoS from UE to the transmission PDN GW;

2, the medium face data of audio call directly send to UE by eMGW, and medium face data will be carried on through eMSC and trigger in the GBR carrying (the professional packet domain of analog circuit domain is carried) of setting up in the PS territory;

3, UE can pass through to register command, location update message, switching message and the audio call signaling etc. in the interface L1 transmission simulation CS territory of eMSC.

It is thus clear that this framework has the following advantages:

Only need set up the signaling plane and the data surface logical path of carry voice calls, the similar IMS of eMSC territory P-CSCF entity, EMGW is the Correspondent Node entity, framework is called out in reusable IMS territory;

1) very little to the change of existing evolvement network equipment, therefore minimum to existing LTE/SAE systematic influence;

2) reusable PCC system is less to the change of each interface

3) can pass through MME, shielding eMSC is to the mobile management of UE.That is: need not know the positional information at UE place on the eMSC.Certainly, when we did not get rid of the connection of passing through the IP aspect between UE and the eMSC, though the IP address of UE does not change, because the conversion of UE lane place still can trigger the reselection procedure that causes eMSC, promptly eMSC need be known the physical location information of UE.

Embodiment two

Fig. 5 shows the network of second kind of network architecture when UE is positioned at home network and forms structure, comprising:

PDN GW502, PCRF503, EMSC504, EMGW505, HSS506, MME507, S-GW508 and SGSN509, wherein EMSC504 further comprises eMGCF5041 and eMSC/VLR5042, EMGW505 further comprises eIM-MGW5051 and eMGW5052.Wherein similar among each several part function and mutual annexation and the embodiment one; Difference is; Link to each other through Gs+ interface (this interface class is similar to the Gs interface among the 2G/3G) between EMSC504 and the MME507; This interface is used for mutual signaling between EMSC504 and MME507, for example: switch message, report the UE location message or adhere to chain of command signalings such as message, position renewal, mobile management etc., can also pass through this interactive interfacing voice call control signaling; At this moment; When the voice call control signaling is mutual between UE501 and EMSC504, the voice call control signaling can through the non-access layer information between UE501 and MME507 (Non-Access Stratum, NAS) and the Gs+ interface between MME507 and the EMSC504 carry out bridge joint.

EMSC504 links to each other with HSS506 through interface C; Be used for from CS territory relevant informations such as HSS506 request user identity, position data and filtering policy information; According to the control signaling that the Gs+ interface between MME and the EMSC204 sends of passing through that receives, it is related with the Media Stream between eIM-MGW to set up UE through Mn control eIM-MGW5051 simultaneously.This Gs+ interface also can only switch to the hand off signaling between the CS territory as transmitting UE from the PS territory.

S-GW is the gateway of evolvement network; MME is the core network control surface entity of evolvement network; SGSN is 2G/3G server network control surface entity and has the function of user entity; This three entity functions and description is all arranged with the interface of adjacent entities in existing standard, this place repeats no more.

Shown in Figure 6 is that the network of second kind of network architecture when UE is positioned at visited network and customer service LocalBreakout formed structure; Shown in Figure 7 is that the network of second kind of network architecture when UE is positioned at visited network and customer service Home-Routed formed structure; Similar with embodiment one; Among the relation of both of these case and the said network architecture of Fig. 5 and the embodiment one between each figure relation identical, those skilled in the art can rationally derive according to the description among the embodiment one fully, so locate to repeat no more.

Can find out that from above description second kind of network architecture has following characteristics:

1) introduced new functional entity eMSC; It has the function of circuit domain tradition MSC-Server; Also possess the interface with the PCC system simultaneously, so it is similar to the P-CSCF functional entity in the IMS territory, can triggers through the Rx+ interface and set up proprietary GBR and carry (the professional packet domain of analog circuit domain is carried); In order to the voice calls Media Stream, ensure thereby make voice flow obtain QoS from UE to the transmission PDN GW;

2) the medium face data of audio call directly send to UE by eMGW, will be carried on through eMSC in PS territory medium face data and trigger in the GBR carrying of setting up;

3) UE can be established to the logical channel/interface between eMSC; In order to the registration of simulating the CS territory with send audio call signaling etc.; Such as: can carry this logical channel/interface of realization through the proprietary signaling plane of setting up between UE and the eMSC, then can send CS chain of command signaling through IP connectivity; At this moment, the Gs+ interface between MME and the eMSC only is used as transmitting when switching message and uses.

4) the interface Gs+ between introducing MME and eMSC adheres to message, location update message, switching message etc. with transmission.

This framework has the following advantages:

1) when the Gs+ interface only uses in handoff procedure, only need set up the signaling plane and the data surface logical path of carry voice calls, the similar IMS of eMSC territory P-CSCF entity, MGW is the Correspondent Node entity, framework is called out in reusable IMS territory;

2) reusable PCC system is less to the change of each interface;

3) when the Gs+ interface only uses in handoff procedure, through MME, maskable eMSC is to the mobile management of UE;

4) when the Gs+ interface also is used for as the mobile management interface; (the CS territory that is used for transmitting the UE simulation like this interface is adhered to need not set up calling signaling face passage in CS territory between UE and eMSC; The signaling of various circuit domain business such as calling, and can be used as when transmit switching message use);

5) when the Gs+ interface also is used for as the mobile management interface, the flow process of adhere to about uniting among the reusable present TS23.060, co-location being upgraded.

Embodiment three

Shown in Figure 8 is that the network when UE is positioned at home network is formed structure under the third network architecture, comprising:

PCRF803, EMSC804, EMGW805; HSS806, MME807, ServingGateway808 and SGSN809; Wherein EMSC804 further comprises eMGCF8041 and eMSC/VLR8042, and EMGW805 further comprises eIM-MGW8051, eMGW8052 and PDNGW802.

Wherein, comprise PDN GW802 entity among the EMGW805, link to each other with Serving Gateway808 and PCRF803 respectively that inner at EMGW805, PDN GW802 also links to each other through the SGi interface with eIM-MGW8051, is used to guarantee the connection of medium face bearer channel.Said PDN GW802 with embodiment one, two in independent PDN GW effect identical; Only present embodiment is integrated into PDN GW in the middle of the EMGW805; PDN GW802 links to each other with PCRF803 through the S7+ interface, receives the strategy that is issued by the PCRF803 formulation and also carries out, and sets up required medium face and carries; Link to each other with eIM-MGW8051 through the SGi interface, the customer traffic in the PS territory is filtered and sends to eIM-MGW8051.

In addition, the annexation of all modules, working method and function etc. are all identical with the network composition structure of embodiment two when UE is positioned at home network, repeat no more here.

As seen from the above analysis, the third network architecture has following characteristics:

Introduced new functional entity eMSC; It has the function of circuit domain tradition MSC-Server; Also possess the interface with the PCC system simultaneously, so its role class is similar to the P-CSCF functional entity in the IMS territory, can triggers through the Rx+ interface and set up proprietary GBR and carry; In order to the voice calls Media Stream, ensure thereby make voice flow obtain QoS from UE to the transmission PDN GW;

Introduce new functional entity eMGW, as the anchor point that user speech is called out, similar PS territory PDNGW, have and Serving-GW between the S5+ interface;

The medium face data of audio call directly send to UE by eMGW, will be carried on through eMSC in PS territory medium face data and trigger in the GBR carrying of setting up;

Introduce the interface Gs+ between MME and eMSC, adhere to message, location update message, switching message etc. with transmission;

When switching, eMSC has the role of MME in the PS territory, needs this moment MME registration self address to eMSC;

EMSC can be known the positional information of UE through the Gs+ interface;

The logical channel that UE passes through to set up is simulated the registration in CS territory, sends the audio call signaling or passes through signaling plane transmission registration, call information;

The PDN-GW function is integrated among the EMGW, when UE adheres to, MME need according to subscription data (such as: default APN) directly select this PDN GW; Under the situation that has many APN, need to select PDN GW through a special identifier (can be the special identifier of similar APN);

When the MME that more than mentions selects the situation of PDN-GW entity, not only consider under this framework, can use, also applicable under other framework of this patent.Like this, MME can select one more suitably PDN-GW satisfy and better carry demand for services, the condition of selection can be with reference to user's subscription data, the preference of operator, the load of equipment, topology of network etc., but do not limit to these modes.

Introduce the L1 interface between UE and eMSC, in order to the call signaling in transmission simulation CS territory, but this interface can save under this framework, and the CS territory call signaling between UE and eMSC can be bridged to eMSC by MME through the NAS message between UE and MME.

This framework has the following advantages:

EMGW and PDN GW unification directly as the user-plane voice data anchor point, can realize that better QoS guarantees.

Embodiment four

Shown in Figure 9 is that the network of the 4th kind of network architecture when UE is positioned at home network formed structure, comprising:

PDN GW902, PCRF903, EMSC904, EMGW905, HSS906, MME907, S-GW908 and SGSN909 in addition, the Gs+ interface in this framework and nonessential interface.Wherein each several part function and mutual annexation and embodiment one or two are similar; Difference is: between eMSC and PDN GW, introduce the Iu-CP-Cs+ interface; Between eMGW and PDN GW, introduce the Iu-UP-Cs+ interface; So PDN GW has played the part of the role of similar RNC, and the QoS between PDN-GW and eMGW guarantees to adopt existing Iu-CS interface mechanism to realize.Do not require whether disposing the PCC framework, under this framework, can set up GBR through the PCC system and carry, can set up carrying yet through the mode of present Iu-CS interface.Here we not limit between eMSC and the PDN-GW only be Iu-CS interface.Under this framework, eMSC can directly control PDN-GW and initiate the professional carrying foundation of CsoverPS according to the circuit domain call instruction of receiving.In addition, this framework is done to change very little to existing evolvement network.

In above-mentioned four kinds of network architectures, when carrying out Signalling exchange through IP connectivity between UE and the eMSC, whether have IP Sec layer according to the chain of command protocol stack and can be divided into two kinds, specifically comprise:

Figure 20 is the chain of command protocol stack structure sketch map that IP Sec layer is arranged, the chain of command protocol stack of this protocol stack structure lower interface L1 be the layer of IP Sec shown in Figure 20 to the CC/SS/SMS layer, it is carried on the IP layer.

Figure 21 is the chain of command protocol stack structure sketch map that does not have IP Sec layer, the chain of command protocol stack of this protocol stack structure lower interface L1 be UDP layer shown in Figure 21 to the CC/SS/SMS layer, it is carried on the IP layer.

Need to prove; Because the chain of command protocol stack under this protocol stack architecture is carried on the IP layer; And interface L1 is used for the transmission circuit domain signaling; Therefore no matter whether said chain of command protocol stack structure have IP Sec layer, all only can be used for the described network architecture through the transmission of IP connectivity carrier signaling of preamble.

When having the L1 interface, also can directly encapsulate CC, SS; The SM/MM/RANAP protocol stack is (gre tunneling for example in a kind of tunnel protocol; GRE:Generic Routing Encapsulation, generic route encapsulation), then packaged message is encapsulated in the message of IP aspect.

Similarly, in above-mentioned four kinds of network architectures, medium face data all are carried on the IP layer, whether have IP Sec layer according to user face protocol stack and also can be divided into two kinds, specifically comprise:

Figure 22 is the structural representation that the user face protocol stack of IP Sec layer is arranged, and medium face data are carried on the IP layer through RTP, UDP and IP Sec agreement under this protocol stack structure.

Figure 23 is the structural representation that does not have the user face protocol stack of IP Sec layer, and medium face data are carried on the IP layer through RTP and udp protocol under this protocol stack structure.

Need to prove because the medium face data of circuit domain all are carried on the IP layer, therefore no matter whether said user face protocol stack framework have IP Sec layer, all is applicable to the described all-network framework of preamble.

In addition, what need to specify is, for EMSC and the EMGW described in above-mentioned all embodiment of the present invention, is the unified title of setting and using in the embodiment of the invention, can not only be confined to literal understanding.EMSC and EMGW can be independent two entities that are provided with, and can link to each other with Mc interface through Mn in the above-mentioned framework between said EMSC and the EMGW, also can pass through an enhanced interface, connect such as H.248 such agreement.Said EMSC with EMGW also can be distinguish on the function, the strict single entity that separates physically.Likewise, for eMGCF and eMSC/VLR among the EMSC, they can be independent two entities that are provided with, and the function of said EMSC is accomplished in combination, also can be distinguish on the function, the strict single entity that separates physically; Simultaneously, for eIM-MGW and eMGW among the EMGW, they can be independent two entities that are provided with; The function of said EMSC is accomplished in combination; Also can be distinguish on the function, the corresponding relation that there is not entity in the strict single entity that separates physically, and said EMSC and EMGW, promptly; When said EMSC was single entity, said EMGW can be independent two entities that are provided with.Therefore should be appreciated that, all should be considered to be encompassed within the protection range of the present invention for any structure that is equal to, replaces of this framework.

In GSM, the business that the user will use network to provide must at first be attached to network, and just the user is registered to the process of network, and the attaching process that is carried out during the UE start is called initially and adheres to.The 5.3.2 chapters and sections have provided the attachment flow of UE in evolvement network among the TS23.401-v110 of 3GPP, and are shown in figure 10, comprising:

Step 1001:UE initiates attach request to evolution base station eNodeB; In this request, will carry self networks ability information and PDN address information; If UE does not have efficient system architecture evolution Temporary Mobile Subscriber Identity (SAE Temporary Mobile Subscriber Identity; S-TMSI), then carry IMSI International Mobile Subscriber Identity (International Mobile Subscriber Identity, IMSI); Otherwise the tracking area identification that carries S-TMSI and be associated with this S-TMSI (Tracking AreaIdentification, TAI).

Step 1002:eNodeB selects a MME according to predetermined mechanisms, and Attach Request message is forwarded to this MME.

Step 1003: if UE uses S-TMSI to do sign; And last time with this adhere to for different MME the time; Claim that the MME that last time adhered to is source MME; This adhere to for target MME, then target MME sends to source MME and comprises S-TMSI and the identification request message of relevant TAI is with the IMSI of request UE with it, source MME is included in the IMSI of UE and authentication five-tuple and returns target MME in the identification response message.If UE can not know that in the MME of source then source MME returns a suitable error reason.

Step 1004: if UE can not know all that in target MME and source MME then target MME sends identification request message with request IMSI to UE, UE will return IMSI.

Step 1005:, then must carry out authorizing procedure, otherwise this flow process is optional if in network, there is not the contextual information of any UE.

Step 1006: if the bearer context that exists this UE to activate at target MME, then target MME will be to gateway (comprising S-GW and PDN GW) transmission deleting bearing message to delete these bearer contexts, and gateway will return the deleting bearing response message.

Step 1007: if MME after the attachment removal last time change has taken place, perhaps this adheres to for this UE is attached to network for the first time, and then target MME sends and upgrades location message to HSS.

User's context on the step 1008:HSS deletion source MME.

Step 1009: if on the MME of source, there is the bearer context of the activated state of this UE, then source MME sends the deleting bearing request message to delete these bearer contexts to gateway.Gateway returns the deleting bearing response message and gives source MME.

Step 1010:HSS sends to target MME and inserts user contracting data message; MME will be to this UE at new tracking area (Tracking Area; TA) existence under confirms that if confirm successfully, target MME will make up user's context and return and insert the user contracting data acknowledge message to HSS.

Step 1011:HSS sends to target MME and upgrades the position acknowledge message.

Step 1012: target MME selects a S-GW according to the S-GW selection function; And send and set up the default bearer request message to selected S-GW; Comprise in this request message: IMSI, MME context ID, RAT type, default bearer QoS and PDN address information, RAT type wherein will be used when subsequent P CC makes a strategic decision.

Step 1013:S-GW creates new clauses and subclauses and sends and set up the default bearer request message to PDN GW in its EPS carrying form, comprise in this request message: the S-GW address of user plane, S-GW user plane TEID, S-GW chain of command TEID, RAT type, default bearer QoS, PDN address information.Until step 1021, S-GW is with any downlink grouped data from PDN GW of buffer memory from this step.

Step 1014: according to circumstances, such as: whether arranged the PCC system, PDN GW maybe be with PCRF alternately to obtain default PCC rule, and this possibly cause the foundation of a plurality of dedicated bearers alternately.

Step 1015:PDN GW returns and sets up the default bearer response message to S-GW; This response message comprises: PDN GW user plane address, PDN GW user plane TEID, PDN GW chain of command TEID also will be comprised this address information if the PDN address information redistributes in this response message.

Step 1016:S-GW returns and sets up the default bearer response message to target MME; This response message comprises: S-GW user plane address, S-GW user plane TEID, S-GW context ID also will be comprised this address information if the PDN address information redistributes in this response message.

Step 1017: target MME sends to adhere to and accepts message to eNodeB, and this message comprises: S-TMSI, TA tabulation also will be comprised this address information if the PDN address information redistributes in this response message.

Step 1018:eNodeB sends radio bearer and sets up request message and give UE, simultaneously, adheres to and accepts message and also will together be sent to UE.

Step 1019:UE transmission comprises the radio bearer that adheres to completion information and sets up response message to eNodeB.

Step 1020:eNodeB transmits to adhere to and accomplishes message to target MME.S1 chain of command message will comprise the address of TEID and eNodeB of eNodeB in order to carry out the downlink data transmission of S1 interface.Adhere to accept message after, in case UE has obtained the PDN address information, then UE can send ascending packet data to eNodeB, and is tunnelled to S-GW and PDN Gateway.

Step 1021: target MME sends and upgrades bearing request message to S-GW.

Step 1022:S-GW returns and upgrades bearing response message to target MME.S-GW will send buffer memory downlink grouped data above that subsequently.

Step 1023: target MME is after receiving the renewal bearing response message, if set up the EPS carrying, then target MME can send the renewal location request message that comprises PDN GW address and give HSS, thinks that the access of non-3GPP is prepared.

Step 1024:HSS storage PDN GW address is also sent updated space and is put response to target MME.

After system introduced the eMSC entity, for continue to use the business in CS territory in the PS territory, UE also need be attached to eMSC.In attaching process; Network side need know whether UE supports the ability of CSoPS; Thereby also support further when whether UE supports the ability judgement of CSoPS whether being attached to MME, further be attached to eMSC under the prerequisite of CSoPS ability at network side, so that the follow-up CSoPS that can initiate in the PS territory is professional; On the other hand, initiated by UE if be attached to the request of eMSC, then UE need know also whether network side supports the ability of CSoPS.Know for network side whether UE supports the ability of CSoPS, can in Attach Request message, carry through UE, also can be by the CSoPS ability of network side preservation UE, such as: be kept among the HSS; Know for UE whether network side supports the ability of CSoPS; Can carry this ability through the system broadcast message that the UE of network side in its coverage sends; Such as: come the ability of radio network network side, wireless side through in system broadcast message, increasing MIB (Master information block, Master Information Block) broadcast blocks, can also be through carrying the ability whether network side supports CSoPS in the Attach Accept message that after UE is attached to MME, sends to UE; In addition; If UE is the intelligent terminal of similar sip terminal, then UE knows that it is positioned at LTE at present and need initiates registration to eMSC, thereby initiatively is initiated to the attaching process of eMSC.

Initially be attached to eMSC to UE, have different initial adhering mode and flow process under various network framework and the application scenarios, the sequential relationship of each message also can according to circumstances be adjusted to some extent in the flow process.Different according to the mode that is attached to eMSC, this attaching process roughly is divided into following several kinds: one, adhere to through the connectedness of IP aspect; Two, unite and adhere to; Three, adhere to through the PCC system.Below respectively above-mentioned several kinds of situation are specified:

Mode one:

When not having the Gs+ interface in the evolvement network, can carry out the process that UE initially is attached to eMSC through the connectedness of IP aspect, specifically can be divided into UE and carry CS chain of command signaling to be attached to eMSC through default bearer or dedicated bearer.

Embodiment five

Figure 11 shows under the mode of adhering to through the connectedness of IP aspect, and UE is attached to the flow chart of eMSC through default bearer, comprising following steps:

Step 1101～step 1117: identical with step 1001～step 1024 among Figure 10, if the discovery of eMSC is undertaken by network side, then need in step 1112, step 1113 address packet with eMSC to be contained in to adhere to and accept to send in the message UE.In addition, the discovery of eMSC also can be undertaken by UE, and concrete eMSC discovery mechanism can further specify hereinafter.

Judgement need be initiated to adhering to of eMSC after step 1118:UE received the message of carrying in the step 1113, if contain IP Sec layer in the chain of command protocol stack, then needed to set up UE to the security association between the eMSC according to the eMSC address of receiving.

Step 1119:UE sends the IMSI Attach Request message through IP connectivity to target eMSC/VLR, and wherein UE is carried as default bearer to this section of PDN GW.

Step 1120: target eMSC/VLR sends to HSS and upgrades location message.

Step 1121: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1122:HSS inserts user contracting data to target eMSC/VLR.

Step 1123:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1124: target eMSC/VLR sends IMSI to UE and adheres to and accept message.

Step 1125: if the TMSI of UE is redistributed, then UE adheres to completion message to target eMSC/VLR transmission IMSI.

Wherein, the eMSC discovery mechanism mainly contains following mode:

1, sets up setting up in the bearing request message of carrying at Attach Request message or in initiation; Cell protocol configuration option (Protocol Configuration Options at this request message; The PCO option) carries the information of request eMSC address in; PDN GW or MME inquire about the eMSC address through the parameter of resolving in the PCO option; (Dynamic Host Configuration Protocol, DHCP) inquiry mechanism is obtained the eMSC address through DHCP for example to dispose address or the PDN GW of eMSC.

2, in HSS, be user's configuration or preservation eMSC address information, and provide this information to MME by HSS.Such as: HSS directly provides the address of eMSC; Promptly in advance when the network planning, corresponding eMSC of configuration and address information thereof in a MME pond are after UE is attached to network; MME gets access to the eMSC address from HSS; After occurrence positions upgraded, if conversion has taken place MME, HSS can provide the address information of the target eMSC after the relevant renewal.

3, MME is according to preset mechanism; Such as: according to positional information, carrier policy, network topology or the MME of network side configuration and the corresponding relation between eMSC etc.; MME for UE selects an eMSC, and it is kept among the MM context, so that can find eMSC when switching.Wherein, two kinds of possible methods are: and similar Access Point Name of A, HSS indication (Access Point Name, indication APN), this indication carry whether allow roaming or Location Area Identification, and MME removes to find eMSC according to these information; B, ambulant related in order to realize MME and eMSC's; MME can be according to the target side id information; Find controlled entity eMSC through configuration querying, such as: MME will carry the sign of a position when asking the eMSC address, for example in the DNS query script; After domain name, increase the sign of a lane place, so that can inquire more reasonably eMSC.

4, UE initiates similar DHCP or name server (Domain Name Server, process DNS), the address that obtains eMSC voluntarily.Such as: the address that obtains eMSC is indicated in expansion in the DHCP request message; Or Mobile Subscriber International ISDN number (Mobile StationInternational ISDN Number through distributing to UE; MSISDN); Use that (Telephone Uniform Resource Locator, form Tel-URL) is asked towards the unified resource of call location in DHCP.

5, network sends broadcasting to the UE that is positioned at its coverage, whether supports ability and the eMSC address of CSoPS comprising network.

6, when the Gs+ interface is used in reorientation; MME need be reoriented to a correct eMSC; Can judge a correct eMSC according to Target Cell Identifier parameters such as (Target Cell ID), but will guarantee that the eMSC of this selection and the eMSC of UE registration are same entities.Therefore in this case, can the address of the eMSC content as MM Context (Mobility ManagementContext, MM context) be kept among the MME, so that MME can find correct eMSC in reorientation eMSC.

7, MME indication packet data network gateway (PDN GW; Packet Data Network GateWay) discovery mechanism by P-CSCF in the prior art removes to find eMSC; In order to realize the ambulant related of MME and eMSC, MME will carry the indication of a position, like TA etc.; Request PDN GW removes to find eMSC, and return results is given MME.

Embodiment six

Utilize default bearer to carry CS chain of command signaling; Its QoS can't ensure;, bandwidth bigger such as time delay is difficult to guarantee etc., therefore can also adopt the method that dedicated bearing carries CS chain of command signaling to accomplish the process that UE is attached to eMSC, and Figure 12 shows under the mode of adhering to through the connectedness of IP aspect; UE is attached to the flow chart of eMSC through dedicated bearing, comprising following steps:

Step 1201～step 1211: identical with step 1001～step 1016 among Figure 10.

Step 1212: foundation is used to carry the dedicated bearer of eMSC signaling, and this step will be set up the wire link part of dedicated bearer.

Step 1213: target MME sends to adhere to eNodeB and accepts message; This message comprises: S-TMSI, TA tabulation; To in this response message, be comprised this address information if the PDN address information redistributes also, in addition, also further comprise eMSC address and dedicated bearer parameter in this message.

Step 1214:eNodeB sends radio bearer and sets up request message and give UE, simultaneously, adheres to and accepts message and also will together be sent to UE.Said radio bearer is set up request message will comprise eMSC address and dedicated bearer parameter.

Step 1215～step 1218: identical with step 1019 among Figure 10～1024, also will carry out the foundation of dedicated bearer Radio Link simultaneously.

Judgement need be initiated to adhering to of eMSC after step 1219:UE received the message of 1114 steps, if contain IP Sec layer in the chain of command protocol stack, then needed set up the security association of UE to eMSC according to the eMSC address of receiving.

Step 1220:UE sends the IMSI Attach Request message through IP connectivity to target eMSC/VLR, and wherein UE is carried as the dedicated bearer that abovementioned steps is set up to this section of PDN GW.

Step 1221: target eMSC/VLR sends to HSS and upgrades location message.

Step 1222: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1223:HSS inserts user contracting data to target eMSC/VLR.

Step 1224:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1225: target eMSC/VLR sends IMSI to UE and adheres to and accept message.

Step 1226: if the TMSI of UE is redistributed, then UE adheres to completion message to target eMSC/VLR transmission IMSI.

Need to prove that in this flow process, the discovery mechanism of eMSC is identical with the method described in the embodiment five.In addition; To set up the dedicated bearing that carries CS chain of command signaling in this flow process; Step 1212 is the foundation of dedicated bearing wire link part, except the foundation of default bearer Radio Link part, also will set up dedicated bearing Radio Link part in step 1213～step 1218.

The foundation of above-mentioned CS chain of command dedicated bearing is triggered by MME, is similar to the method for building up of default bearer in the evolvement network, and in addition, the trigger mechanism that CS chain of command dedicated bearing is set up also comprises following several kinds:

1, in attaching process, triggers top-down this dedicated bearing of setting up to carry CS chain of command signaling by PDN GW.

2, after UE is attached to MME; Adhering to the process of accepting to carry in the message eMSC address and initiating by UE to adhere to this eMSC; At first carry CS chain of command signaling and initiate attach request to eMSC through default bearer; And then eMSC triggers through PCRF and sets up this dedicated bearer, when this dedicated bearer set up accomplish after, the CS chain of command carries will transfer to dedicated bearer by default bearer.

3, set up this dedicated bearing by the UE triggering, be similar to the dedicated bearing that triggers by UE in the evolvement network and set up process.

Mode two:

When having the Gs+ interface in the evolvement network, when initially being attached to MME, UE initially is attached to eMSC, and also claim to unite and adhere to, and further according to being initiatively to report the ability of CSoPS or be divided into two kinds of situation by the ability that network is reported CSoPS by UE.

Embodiment seven

If UE parameter A ttach Type through wherein in Attach Request message representes whether UE possesses the ability of CSoPS; In this way; Then and then by network side according to self whether supporting that the ability of CSoPS judges whether to be initiated to the attaching process of eMSC; Corresponding flow process is shown in figure 13, may further comprise the steps:

Step 1301:UE initiates attach request to eNodeB; ENodeB is that UE selects the MME entity; And this attach request is transmitted to corresponding M ME, comprise in this Attach Request message: the network capabilities of UE, PDN address, Attach Type parameter, S-TMSI and the TAI or the IMSI that are associated with this S-TMSI.Attach Type parameter is used for carrying out adhering to of which kind of type to the network side indication; Such as: only be attached to evolvement network, under the situation that IMSI has adhered to before this, be attached to evolvement network and unite and be attached to evolvement network and CS network; UE unites indication network and adheres in the present embodiment, and this parameter representes that also UE possesses the ability of CSoPS simultaneously.

Step 1302～step 1310: identical with step 1002～step 1011 among Figure 10.

Step 1311: network side carries out the judgement whether self supports the CSoPS ability, if support, then target MME adheres to unite to target eMSC/VLR transmission position updating request.

Step 1312: target eMSC/VLR sends to HSS and upgrades location message.

Step 1313: if eMSC/VLR changes, then HSS deletes the user's context of source eMSC/VLR.

Step 1314:HSS inserts user contracting data to target eMSC/VLR.

Step 1315:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1316: target eMSC/VLR sends the position renewal to target MME and accepts message.

Step 1317～step 1319: set up default bearer, step 1012～step 1016 is identical among correlation step and Figure 10.

Step 1320～step 1321: flow process is identical with Figure 10 step 1017～step 1018, and difference is in these two steps, whether successfully united the information that is attached to eMSC with carrying UE.

Step 1322～step 1325: flow process is identical with Figure 10 step 1019～step 1024.

Step 1326: if the TMSI of UE is redistributed, then target MME will send TMSI to target eMSC/VLR and redistribute completion message.

Need to prove that the UE adhering mode of this flow process is the associating adhering mode, therefore need know the address of target eMSC, the discovery mechanism of eMSC is said identical with preamble.In addition; Step 1311～step 1316 is for uniting the process that is attached to eMSC; Step 1317～step 1319 is for setting up the process of default bearer; Two processes do not have the priority property on the strict sequential, and described in the present embodiment is to unite earlier to adhere to set up default bearer again, unite and adhere to but can set up default bearer earlier yet.

Embodiment eight

If UE does not carry the sign whether UE possesses the CSoPS ability in Attach Request message; But, UE informs by network whether this network of UE supports the ability of CSoPS after being attached to MME; And then judge whether to be initiated to the initial attachment flow of eMSC according to the ability that self whether possesses CSoPS by UE; Then corresponding flow chart is shown in figure 14, may further comprise the steps:

Step 1401～step 1413: step 1001～step 1016 is identical among flow process and Figure 10.

Step 1414: target MME sends to adhere to eNodeB and accepts message, and this message comprises: S-TMSI, TA tabulation also will be comprised this address information if the PDN address information redistributes in this message; In addition; If network side is supported the ability of CSoPS, then this information will in this message, be comprised, further; If eMSC is found by network side the address, also will comprise the eMSC address in this message.

Step 1415:eNodeB sends radio bearer and sets up request message to UE; Simultaneously; Adhere to and accept message and also will together be sent to UE; If step 1414 is said adheres to and accept message and comprised the information such as sign and/or eMSC address that network possesses the CSoPS ability, then also accept to comprise in the message corresponding information adhering in this step.

Step 1416～step 1419: step 1019～step 1024 is identical among flow process and Figure 10; If UE receives shown in the step 1415 after the message; Judge the ability of learning network side support CSoPS; And UE also possesses the ability of CSoPS, then in step 1416～step 1417, carries IMSI and is attached to the solicited message of specifying eMSC.

Step 1420: target MME sends the IMSI Attach Request message to target eMSC/VLR.

Step 1421: target eMSC/VLR sends to HSS and upgrades location message.

Step 1422: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1423:HSS inserts user contracting data to target eMSC/VLR.

Step 1424:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1425: target eMSC/VLR sends IMSI to target MME and adheres to and accept message, and is transmitted to UE by MME.

Step 1426: if the TMSI of UE is redistributed, then UE adheres to completion message via target MME to target eMSC/VLR transmission IMSI.

Need to prove that the eMSC discovery mechanism in this flow process is said identical with preamble.

Mode three:

Do not have the Gs+ interface in the network, UE can also be attached to eMSC through the PCC system.

Embodiment nine

In the present embodiment; UE is attached to the information of eMSC to the MME request of sending through NAS message; MME and then should ask through GPRS tunnel control face agreement (GPRS TunnelingProtocol for Control plane; GTP-C) message sends to PDN GW, through the PCC system this request is sent to eMSC again.In this attaching process; UE carries the sign that UE possesses the CSoPS ability through Attach Type parameter in Attach Request message; Whether possesses the ability of CSoPS by network side according to self then; Judge whether to be initiated to the initial attaching process of eMSC, corresponding flow process is shown in figure 15, may further comprise the steps:

Step 1501:UE initiates attach request to eNodeB; ENodeB is that UE selects the MME entity; And this attach request is transmitted to corresponding M ME, comprise in this Attach Request message: the network capabilities of UE, PDN address, Attach Type parameter, S-TMSI and the TAI or the IMSI that are associated with this S-TMSI.Attach Type parameter is used for carrying out adhering to of which kind of type to the network side indication; Such as: only be attached to evolvement network, under the situation that IMSI has adhered to before this, be attached to evolvement network and unite and be attached to evolvement network and CS network; UE unites indication network and adheres in the present embodiment, and this parameter representes that also UE possesses the ability of CSoPS simultaneously.

Step 1502～step 1510: flow process is identical with Figure 10 step 1003～step 1011.

Step 1511: in this step, also further sending to setting up of PDN GW carries the IMSI Attach Request message in the default bearer request message to mail to S-GW at target MME.

Step 1512: in this step, in the PCRF interaction message that PCRF sends, carry the IMSI Attach Request message at PDN GW.

Step 1513:PCRF sends the IMSI Attach Request message to target eMSC/VLR.

Step 1514: target eMSC/VLR sends to HSS and upgrades location message.

Step 1515: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1516:HSS inserts user contracting data to target eMSC/VLR.

Step 1517:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1518: target eMSC/VLR sends IMSI to PCRF and adheres to and accept message.

Step 1519:PCRF sends the mutual acknowledge message of PCRF to PDN GW, carries IMSI simultaneously and adheres to and accept message.

Step 1520: in this step, mail to S-GW and further send to setting up of target MME at PDN GW and carry IMSI in the default bearer acknowledge message and adhere to and accept message.

Step 1521: in this step, accept to comprise in the message adhering to: represent that UE not only has been attached to the information that MME, IMSI also have been attached to eMSC.

Step 1522: in this step, set up in the request message at radio bearer and to comprise: represent that UE not only has been attached to the information that MME, IMSI also have been attached to eMSC.

Step 1523～step 1526: identical with step 1019 among Figure 10～1024.

Step 1527: if the TMSI of UE is redistributed, then target MME sends TMSI to target eMSC/VLR and redistributes completion message.

Need to prove that the eMSC discovery mechanism in this flow process is said identical with preamble.

In above-mentioned attachment flow, all exist and how to go to find that the PDN GW of an optimum carries the problem of CS audio call, in practical application, the selection of relevant PDN GW has following possibility method:

1) as eMSC during, irrelevant with PDN GW fully as a upper layer entity, only need keep the IP layer connectivity of UE and eMSC;

When 2) adhering to; MME can inquire a specific PDN GW according to the indication of subscription data or APN; The configuration of more excellent physical region is arranged between this PDN GW and each eMSC, or the address that a suitable PDN GW directly is provided based on user's subscription data HSS is to MME;

3) when multi-APN exists, directly select a new PDN GW (the PDN GW that is different from default bearer) when UE makes a call, and PDN GW sets up dedicated bearing to carry CS chain of command signaling in view of the above.

In above-mentioned attachment flow, when having interface between MME and eMSC, also exist and how to select a correct MME to accomplish the problem of follow-up switching flow, possible system of selection has:

1) function of all MME is consistent, can guarantee to carry out unified function;

2) after eNodeB selects a MME, judge whether this MME supports the ability of CSoPS, can not support on the MME of CSoPS ability according to re-route to of the configuration parameter of self if do not support;

3) the relevant parameter of the last configuration of eNB is chosen a correct MME, promptly supports the MME of CSoPS ability.

In the process of adhering to eMSC; EMSC might carry out authentication (this operates among the above-mentioned embodiment of adhering to all not shown) to UE; Such as: when UE is registered to eMSC through IP connectivity; EMSC will initiate and UE between the authentication of safety to consult security parameter, then eMSC can notify UE the follow-up security association that need not set up UE and eMSC.

Above-mentioned attachment flow is initial attachment flow, is attached to the flow process of network when UE starts shooting that is:.Below, cause its scene that need be attached to new eMSC again to describe the UE that is attached to network owing to moving.

After UE is attached to eMSC; When if the user moves under the Idle state; Might cause its service currently to change, and then can cause the change of eMSC, in order to tackle this situation for UE provides the MME of service; Just need carry out the mobile management under the idle state, just be attached to the process of new target MME and target eMSC again.According to the difference that the network architecture possibly exist, be similar to the division methods of initial attachment flow, can be divided into the mobile management under the Idle state that has under the Gs+ interface case and not have the two kinds of situation of mobile management under the Idle state under the Gs+ interface case.

Embodiment ten

When having the Gs+ interface in the network architecture, will carry out co-location and upgrade, the situation that present embodiment changes with MME and S-GW simultaneously is that example describes, its reattachment flow process is shown in figure 16, may further comprise the steps:

Step 1601:UE via eNodeB to the request of target MME initiating updating of tracking area.

Step 1602: target MME is to source MME request user's context.

Step 1603: network carries out authentication to the user.

Step 1604: target MME sends context acknowledgement message to source MME.

Step 1605: because S-GW changes, target MME sends to target S-GW and creates bearing request message.

Upgrade beared information between step 1606: target S-GW and the PDN GW.

Step 1607: target S-GW sends to target MME and creates bearing response message.

Step 1608: target MME sends to HSS and upgrades location message.

User's context on the step 1609:HSS deletion source MME.

Step 1610: source MME sends the deleting bearing request message to delete these bearer contexts to S-GW.S-GW returns the deleting bearing response message and gives source MME.

Step 1611:HSS inserts user contracting data to target MME.

Step 1612:HSS sends to target MME and upgrades the position acknowledge message.

Step 1613: target MME sends position updating request to target eMSC/VLR and upgrades to carry out co-location.

Step 1614: target eMSC/VLR sends to HSS and upgrades location message.

Step 1615: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1616:HSS inserts user contracting data to target eMSC/VLR.

Step 1617:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1618: target eMSC/VLR sends the position renewal to target MME and accepts message.

Step 1619: target MME sends tracing section updating to UE and accepts message.

Step 1620:UE sends tracing section updating to target MME and accomplishes message.

Step 1621: if the TMSI of UE is redistributed, then target MME sends TMSI to target eMSC/VLR and redistributes completion message.

Need to prove that this method adopts co-location to upgrade, in processing procedure, need to confirm the address of target eMSC, the discovery mechanism of eMSC is identical with the said method of preamble.

In addition; Present embodiment is the situation that supposition MME and S-GW change simultaneously; Also possibly not change by S-GW in the practical application, this moment, corresponding flow process should be: step 1605 and step 1607 change target MME into and to the serving MME entity of S-GW notice UE change have taken place, and should change and reply response message by the S-GW record; This operation is a usefulness of the UE under the Idle state being initiated paging for follow-up; Correspondingly, needn't carry out the operation of step 1606 and step 1610 again, remainder is all said identical with preamble.

Embodiment 11

If when not having the Gs+ interface in the network architecture, just need carry out the reattachment process through IP connectivity, the situation that present embodiment changes with MME and S-GW simultaneously is that example describes, reattachment flow process in this case is shown in figure 17, may further comprise the steps:

Step 1701～step 1712: identical with Figure 16 step 1601～step 1612, to judge in this process whether eMSC changes, and obtain its address.

Step 1713: target MME sends tracing section updating to UE and accepts message, simultaneously new eMSC address is fed back to UE.

Step 1714:UE sends tracing section updating to target MME and accomplishes message.

Step 1715: if contain IP Sec layer in the chain of command protocol stack, then UE needs according to the eMSC address of receiving, sets up UE to the security association between the target eMSC.

Step 1716:UE sends the location area updating request message through IP connectivity to target eMSC/VLR, and wherein UE is the carrying of setting up for carrying CS chain of command signaling before this to the carrying of this section of PDN GW, and this carrying possibly be that default bearer also possibly be a dedicated bearer.

Step 1717: target eMSC/VLR sends to HSS and upgrades location message.

Step 1718: if eMSC/VLR changes, then HSS deletes the user's context on the eMSC/VLR of source.

Step 1719:HSS inserts user contracting data to target eMSC/VLR.

Step 1720:HSS sends to target eMSC/VLR and upgrades the position acknowledge message.

Step 1721: target eMSC/VLR sends location area updating to UE and accepts message.

Step 1722:UE sends location area updating to target eMSC/VLR and accomplishes message.

Need to prove that need to confirm the address of eMSC in this method processing procedure, its discovery mechanism is said identical with preamble.In addition, what also need remark additionally is in SAE, not have lane place (LocationArea; LA) notion, when TA changed, UE can trigger the process of the LAU of a logic; Or do the position of simulating the CS territory of being correlated with by network side entity notice UE and upgrade, to realize the migration of eMSC.The last information of preserving UE place TA of eMSC, or the information of preserving UE place LA, LA can derive from TA.EMSC will determine whether that the TMSI that issues simulation gives UE according to the strategy of operator, the conditions such as configuration of data.New eMSC can confirm old eMSC according to conditions such as the position relation at UE place, signs.Even UE reports the ID of old eMSC voluntarily in location update message.

In addition; Present embodiment is the situation that supposition MME and S-GW change simultaneously; Also possibly not change by S-GW in the practical application, this moment, corresponding flow process should be: step 1705 and step 1707 change target MME into and to the serving MME entity of S-GW notice UE change have taken place, and should change and reply response message by the S-GW record; This operation is a usefulness of the UE under the Idle state being initiated paging for follow-up; Correspondingly, needn't carry out the operation of step 1706 and step 1710 again, remainder is all said identical with preamble.

Under above-mentioned Idle state in the mobile management flow process; Similar with attachment flow; Also exist the PDN GW how to remove to find an optimum with the problem of carrying the CS audio call, problem and the problem that eMSC possibly carry out authentication to UE of MME of support CSoPS ability of finding an optimum; Its method is similar with attachment flow, repeats no more here.

When the user does not re-use the network service, for example shutdown or battery electric quantity are used up, or network will be initiated the attachment removal flow process by user or network when notifying the user not continue access network.

Difference according to triggering the professional entity of attachment removal can be divided into two kinds of situation with the attachment removal process, that is: the attachment removal process of the attachment removal process of UE initiation and network side initiation.

The attachment removal process of being initiated by UE at first is discussed: according to the difference of the network architecture; Similar with the criteria for classification of preamble; Can further be divided into two kinds of situation to the attachment removal process according to whether there being the Gs+ interface in the network: the mode that adopts the associating attachment removal when Gs+ interface is arranged; Pass through IP connectivity when not having the Gs+ interface earlier from the eMSC attachment removal and then from the evolvement network attachment removal.

Embodiment 12

If there is the Gs+ interface in the network, then adopt the mode of associating attachment removal, concrete attachment removal flow process is shown in figure 18, may further comprise the steps:

Step 1801:UE sends detach request message to MME.

Step 1802:MME sends the deleting bearing request message to S-GW, S-GW and then send the deleting bearing request message to PDNGW.

Step 1803: if arranged the PCC framework in the network, then PDN GW carries out alternately with PCRF, and notice PCRF carries and discharges, otherwise direct execution in step 1804.

Step 1804:PDN GW sends the deleting bearing response message to S-GW, S-GW and then send the deleting bearing response message to MME.

Step 1805:MME sends IMSI detach request message to eMSC/VLR.

Step 1806:eMSC/VLR sends the IMSI attachment removal to MME and accepts message.

Step 1807: if not using up caused shutdown owing to the UE electric weight, then MME sends attachment removal to UE and accepts message, otherwise direct execution in step 1808.

Step 1808:MME initiates signaling and connects dispose procedure.

Need to prove that step 1802～step 1804 is the process of deleting bearing, step 1805～step 1806 is an IMSI attachment removal process, and these two processes do not have strict priority on sequential, does not also have the interdependence on the order.Can deleting bearing process as be shown in the examples preceding, IMSI attachment removal process after, also possibly be IMSI attachment removal process formerly, the deleting bearing process after, also possibly be that two processes are carried out simultaneously.

Embodiment 13

If there is not the Gs+ interface in the network, then need carry out the process of attachment removal eMSC earlier, and then carry out the process of attachment removal evolvement network through IP connectivity, flow process is shown in figure 19, may further comprise the steps:

Step 1901: if contain IP Sec layer in the chain of command protocol stack, and there is not security association between UE and its service eMSC/VLR, then triggers being established to the security association between the target eMSC by UE, otherwise direct execution in step 1902.

Step 1902:UE initiates IMSI detach request message through IP connectivity to eMSC/VLR, wherein, is to be the carrying of the carrying CS chain of command signaling of UE foundation before this from UE to the carrying the PDN GW.

Step 1903:eMSC/VLR sends the IMSI attachment removal through IP connectivity to UE and accepts message.

Step 1904:UE initiates detach request message to MME.

Step 1905:MME sends the deleting bearing request message to S-GW, S-GW and then send the deleting bearing request message to PDNGW.

Step 1906: if arranged the PCC framework in the network, then PDN GW carries out alternately with PCRF, and notice PCRF carries and discharges.

Step 1907:PDN GW sends the deleting bearing response message to S-GW, S-GW and then send the deleting bearing response message to MME.

Step 1908: if not using up caused shutdown because of the UE electric weight, then MME sends attachment removal to UE and accepts message, otherwise direct execution in step 1909.

Step 1909:MME initiates signaling and connects dispose procedure.

Need to prove that this method is through IP connectivity IMSI attachment removal eMSC, therefore must first IMSI attachment removal eMSC, further attachment removal evolvement network.Otherwise if first attachment removal evolvement network, then UE can be released to the carrying between the PDN GW, thereby just can't accomplish the process of IMSI attachment removal eMSC through IP connectivity.

For the attachment removal flow process of initiating by network side; That is: the attachment removal flow process initiated of the attachment removal flow process initiated of MME or HSS; Similar with the attachment removal flow process of initiating by UE, also be divided into and pass through two kinds of flow processs of IP connectivity attachment removal under the associating attachment removal that has under the Gs+ interface case and the no Gs+ interface case.For passing through IP connectivity attachment removal eMSC; Equally necessary first IMSI attachment removal eMSC is the attachment removal evolvement network again, at this moment, can notify UE to initiate the process of IMSI attachment removal eMSC by MME; Also can initiate the IMSI detach request to S-GW, and then send to eMSC through PDN GW by MME.Idiographic flow and embodiment 12,13 are similar, and just detach request has network side to initiate, and repeats no more here.

Should be appreciated that the above is merely preferred embodiment of the present invention, is not to be used to enumerate all technical characterictics of the present invention.Therefore, the above is not to be used to limit spirit of the present invention and protection range, and equivalent variations that any those of ordinary skill in the art made or replacement all should be regarded as being encompassed within protection scope of the present invention.

Claims (4)

1. a system that realizes network backward compatibility is characterized in that, this system comprises: "Policy and Charging Rules Function entity PCRF, home subscriber server HSS, the EMSC of evolution mobile switching centre and evolution WMG EMGW;

PCRF is used to receive the application layer conversation information of being sent by EMSC, works out corresponding strategy and charging regulation according to said application layer conversation information;

EMSC is used for confirming UE from HSS request user profile and by said user profile, and receives the chain of command signaling of this UE that the control messages that said chain of command signaling is converted into based on circuit domain sends to EMGW;

HSS is used to deposit user profile;

EMGW is used for according to said control messages based on circuit domain, with bearer service from converting to based on circuit domain based on packet domain.

2. system according to claim 1 is characterized in that, further comprises Mobility Management Entity MME, gateway S-GW in this system, supporting node SGSN and packet data network gateway PDN GW;

PDN GW links to each other with PCRF, is used to receive the strategy that is sent by PCRF and carry out, and sets up required medium face and carries; After filtering, customer traffic in the packet domain PS that is used for the S-GW that receives is sent issues EMGW;

Said MME is used for and SGSN, S-GW and HSS interacting user information, and said user profile sent to EMSC.

3. system according to claim 1, its characteristic with, said EMSC further comprises: eMSC/VLR and eMGCF; Said EMGW further comprises: eIM-MGW and eMGW;

EIM-MGW receives the medium face data that PDN GW sends through the SGi interface, and the medium face data that receive are converted into based on behind the CS territory through internal interface Nc, sends to eMGW; Also be used to receive the medium face data that convert into of eMGW transmission, transmit to PDN GW based on the PS territory;

EMGW is used to receive the medium face data based on the CS territory that convert into that eIM-MGW sends; Be outbound call if call out, then eMGW sends medium face data through Nb interface, is office call if call out, and then eMGW sends medium face data through the Iu-CS/A interface to access network entity; Also be used for the medium face data in the CS territory that receives through Nb interface are proceeded to the conversion in PS territory through internal interface Nc, and send to eIM-MGW;

EMGCF is used for selecting UE according to user profile, and receiving the control signaling that this UE sends from HSS request user profile, transmits control message to eIM-MGW according to this control signaling, and said control signaling is sent to PCRF;

EMSC/VLR; Be used for from HSS request user profile; Select UE according to user profile; And receive the control signaling that this UE sends, and transmit control message to eMGW through Mc interface according to this control signaling, send to eMGW after converting the control signaling in the PS territory of eMGCF transmission into control messages based on the CS territory.

4. system according to claim 2 is characterized in that, said MME links to each other the control signaling in it sends various PS territory through the Gs+ interface with EMSC; Said EMSC further comprises: eMSC/VLR and eMGCF; Said EMGW further comprises: eIM-MGW and eMGW;

EIM-MGW receives the medium face data that PDN GW sends through the SGi interface, and the medium face data that receive are converted into based on behind the CS territory through internal interface Nc, sends to eMGW; Also be used to receive the medium face data that convert into of eMGW transmission, transmit to PDN GW based on the PS territory;

EMGW is used to receive the medium face data based on the CS territory that convert into that eIM-MGW sends; Be outbound call if call out, then eMGW sends medium face data through Nb interface, is office call if call out, and then eMGW sends medium face data through the Iu-CS/A interface to access network entity; Also be used for the medium face data in the CS territory that receives through Nb interface are proceeded to the conversion in PS territory through internal interface Nc, and send to eIM-MGW;

EMGCF is used for selecting UE from HSS request user profile according to user profile; Receive the control signaling that this UE sends; And receive MME through the control signaling that the Gs+ interface sends, and transmit control message to eIM-MGW according to said control signaling, said control signaling is sent to PCRF;

EMSC/VLR; Be used for from HSS request user profile; Select UE according to user profile, receive the control signaling that this UE sends, and receive the control signaling that MME sends through the Gs+ interface; Transmit control message to eMGW through Mc interface according to said control signaling, send to eMGW after the control signaling in the PS territory that eMGCF is sent converts the control messages based on the CS territory into.

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