CN101651905B

CN101651905B - Separation method, system and equipment for circuit domain (CS) service fallback to conventional network

Info

Publication number: CN101651905B
Application number: CN2008101474283A
Authority: CN
Inventors: 周汉; 于益俊; 陈中平; 吴问付
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-08-15
Filing date: 2008-08-15
Publication date: 2012-11-07
Anticipated expiration: 2028-08-15
Also published as: CN101651905A; CN102984776B; CN102984776A

Abstract

The embodiment of the invention discloses a method, a system and equipment for separating in a circuit switched domain (CS) service fallback conventional network. The method comprises the following steps that: a first mobility management entity generates a separation indication message carrying a separation type; and the first mobility management entity sends the separation indication message to a second mobility management entity to indicate the second mobility management entity to separate a user terminal according to the separation type carried in the separation indication message. By using the method, the system and the equipment, the separation indication message sent to the second mobility management entity by the first mobility management entity carries the separation type, which ensures that the second mobility management entity performs the separation processing on the user terminal according to the separation type carried in the separation indication message, and can ensure that the user terminal is separated correctly in a separation flow in a CS Fallback and ISR scene.

Description

The separation method of circuit switched domain (CS) service fallback conventional network, system and equipment

Technical field

The present invention relates to communication technical field, relate in particular to a kind of separation method, system and equipment of circuit switched domain (CS) service fallback conventional network.

Background technology

GPRS (General Packet Radio Service; GPRS)/UMTS (Universal Mobile Telecommunications System; UMTS) be a kind of mobile communications network of 3GPP (The 3rd Generation Partnership Project, third generation gpp) tissue definition, it comprises RAN (Radio Access Network; Radio Access Network) and CN (CoreNetwork, core network) two parts.CN is from be divided into CS (Circuit Switched Domain, circuit commutative field) and PS (Packet Switched Domain, packet-switched domain) in logic.The main processing speech business of CS territory, PS territory main processing Packet Service.The signaling plane controlled entity in CS territory is MSC (MobileSwitch Center; Mobile switching centre)/VLR (Visitor Location Register; VLR Visitor Location Register), the signaling plane controlled entity in PS territory is SGSN (Serving GPRS Support Node, a Serving GPRS Support Node).

As shown in Figure 1; SGSN can link to each other through Gs interface with MSC/VLR as the chain of command entity in PS territory, through A interface and BSC (Base Station Controller; Base station controller) connects; Connect through Iu interface and RNC (Radio Network Controller, radio network controller), for GPRS/UMTS provides the data service service.The A interface of UE (User Equipment, subscriber equipment) through BSC inserts SGSN and accomplishes PS and generally be referred to as gprs service when professional; And the Iu interface of UE through RNC inserts SGSN and accomplishes PS and generally be referred to as the UMTS business when professional.

In order to tackle the challenge of wireless broad band technology, keep the leading superiority of 3GPP network, 3GPP has formulated LTE (Long Term Evolution, Long Term Evolution) plan.At the given a definition framework of new mobile communications network of the guidance of this evolution plan, this framework is compared more flat with present GPRS/UMTS, and has only kept packet domain, also can be called EPS (Evolved Packet System, the packet network of evolution).

The core net of wireless evolution network mainly comprises MME (Mobility Management Entity; Mobile management entity), S-GW (Serving Gateway gateway) and P-GW (Packet DataNetwork Gateway; Grouped data network gateway) three logic function bodies; Wherein MME is responsible for functions such as NAS signaling and the encryption of NAS signaling and roaming, tracking; Distributing user temporary identity sign, safety function etc., it is corresponding to the control plane part of current UMTS internal system SGSN.S-GW is responsible for the local mobility anchor point and the mobility anchor point and the Lawful Interception relevant information of 3GPP internal system; P-GW is responsible for strategy execution and charging and Lawful Interception correlation function.

Because a lot of professional all the operating in the circuit domain of GPRS/UMTS of operator; Professional in order in the EPS network, to reuse existing C S; Proposed to be connected to the method for CS domain core net through the EPS network; As shown in Figure 2, the MME in the EPS network is connected on the MSC of traditional C core net through a SGs interface.

Under this framework, when UE prepared to initiate MO (Mobile Originating, the beginning exhales) business in CS territory, UE need forward the GPRS/UMTS network earlier to, selects the sub-district of a 2G/3G to be stationed, and then carries out the MO business.When MSC receives a MT (Mobile Terminated; Exhale eventually) when professional, MSC sends beep-page message through the SGs interface to MME, and MME carries out paging through the EPS network to UE; After UE receives this beep-page message; Need forward the GPRS/UMTS network earlier to, select the sub-district of a 2G/3G to be stationed, and then accomplish the professional subsequent treatment of this MT.This framework and processing method can be called CS fallback, and promptly the CS business is returned the legacy network processing.

Another demand of evolvement network is to realize ISR (Idle-mode Signalling Reduction; Saving signaling under the idle pulley or limitation signaling) function, its main purpose is to reduce idle pulley UE down in the mobile management flow process between the different access networks (as reducing the Inter 3GPP Access System Mobility in Idle State processing between GERAN/UTRAN and the EUTRAN).The solution of the mechanism of the ISR between the 3GPP access network is two login mechanisms at present; Be that UE registers at two different access networks, will do not trigger Inter3GPP Access System Mobility flow process when the UE under the idle pulley moves like this between these two access networks.

At E-UTRAN (Evolved UMTS Territorial Radio Access Network; The UMTS land radio access web of evolution) in the network; Unite and adhere to or co-location district more during new technological process when UE initiates one; If MME supports the SGs interface, MME can be saved in the SGs association of MSC for UE in said flow process.This moment, the state of MME record was SGs-ASSOCIATED.Same, the state of MSC/VLR record also is SGs-ASSOCIATED.MME and MSC/VLR also need to preserve mutually the address simultaneously.

In the GERAN/UTRAN network, unite and adhere to or co-location district new technological process more when UE initiates one, if SGSN supports Gs interface, SGSN can be saved in the Gs of MSC related for UE in said flow process.This moment, the state of SGSN record was Gs-ASSOCIATED.Same, the state of MSC/VLR record also is Gs-ASSOCIATED.SGSN and MSC/VLR also need to preserve mutually the address simultaneously.The access network elements of GERAN/UTRAN network possesses the different interface of two covers, promptly can also can insert packet domain in the place in circuit territory.

The inventor is in realizing process of the present invention; Find that there is following problem in implementation of the prior art: under the scene of CS fallback and ISR; Because when SGs or Gs interface change, MME and not perception of SGSN are so can't correct notice MSC/VLR separate UE.

Summary of the invention

Embodiments of the invention provide a kind of separation method, system and equipment of circuit switched domain (CS) service fallback conventional network, can correctly user terminal be separated to be implemented in the branch reason flow process under the CS Fallback&ISR scene.

Embodiments of the invention provide a kind of separation method of circuit switched domain (CS) service fallback conventional network, comprising:

First Mobility Management Entity generates and carries the separation Indication message of type of separation;

Said first Mobility Management Entity sends said separation Indication message to second Mobility Management Entity, user terminal is separated according to the type of separation of carrying in the said separation Indication message to indicate second Mobility Management Entity.

Embodiments of the invention also provide the piece-rate system of the professional passback system of a kind of circuit domain CS network, comprising:

First Mobility Management Entity is used to generate the separation Indication message that carries type of separation; And said separation Indication message sent to second Mobility Management Entity;

Second Mobility Management Entity is used for according to the type of separation that said separation Indication message carries user terminal being separated.

Embodiments of the invention also provide a kind of Mobility Management Entity, are used for the separation of user terminal at the professional passback system of circuit domain CS network, comprising:

Separate the Indication message generation unit, be used to generate the separation Indication message that carries type of separation;

Separate the Indication message transmitting element, be used for said separation Indication message is sent to second Mobility Management Entity, according to the type of separation of carrying in the said separation Indication message user terminal is separated to indicate second Mobility Management Entity.

Separate the Indication message receiving element, be used to receive the separation Indication message that first Mobility Management Entity sends;

Separate the Indication message transmitting element, be used for type of separation, send the separation Indication message of correspondence to the signaling plane controlled entity of circuit domain according to said separation Indication message.

Compared with prior art, embodiments of the invention have the following advantages:

First Mobility Management Entity carries type of separation at the separation Indication message that sends to second Mobility Management Entity; Make second Mobility Management Entity carry out separating treatment to user terminal, can guarantee correctly user terminal to be separated in the separation process under CS Fallback&ISR scene according to the type of separation of carrying in the said separation Indication message.

Description of drawings

Fig. 1 is the sketch map of the GPRS/UMTS network architecture in the prior art;

Fig. 2 is the sketch map of the EPS network architecture in the prior art;

Fig. 3 is the separation method flow chart of the professional passback system of circuit domain CS network in the embodiments of the invention;

Fig. 4 is the sketch map that UE initiates separation process in the embodiments of the invention one at the E-UTRAN network;

Fig. 5 is the sketch map that UE initiates separation process in the embodiments of the invention two at the UTRAN/GERAN network;

Fig. 6 A to Fig. 6 D is notice SGSN and the d/d flow chart of MME interface in the embodiments of the invention three;

Fig. 7 is the user terminal separation process figure that MME initiates in the embodiments of the invention four;

Fig. 8 is the user terminal separation process figure that SGSN initiates in the embodiments of the invention four;

Fig. 9 is the structural representation of first Mobility Management Entity in the embodiments of the invention;

Figure 10 is the structural representation of second Mobility Management Entity in the embodiments of the invention.

Embodiment

Embodiments of the invention provide the separation method of the professional passback system of a kind of circuit domain CS network, and are as shown in Figure 3, comprising:

Step s301, first Mobility Management Entity generate and carry the separation Indication message of type of separation.

Step s302, first Mobility Management Entity send said separation Indication message to second Mobility Management Entity, user terminal are separated according to the type of separation of carrying in the said separation Indication message to indicate second Mobility Management Entity.

The embodiment of the application of the invention; First Mobility Management Entity carries type of separation at the separation Indication message that sends to second Mobility Management Entity; Make second Mobility Management Entity carry out separating treatment to user terminal, can guarantee correctly user terminal to be separated in the separation process under the CSFallback&ISR scene according to the type of separation of carrying in the said separation Indication message.

Concrete, in the separation method of the professional passback system of the circuit domain CS of embodiment of the invention network, mainly comprise two kinds of processing modes.In first kind of processing mode, under the situation of the change of not perception SGs and Gs interface, realize the separation of user terminal as the MME of Mobility Management Entity and SGSN; In second kind of processing mode, under the situation of the change of perception SGs and Gs interface, realize the separation of user terminal as the MME of Mobility Management Entity and SGSN; Below in conjunction with concrete embodiment above-mentioned two kinds of processing modes are described respectively.

At first the situation to the change of MME in the processing mode one and not perception of SGSN SGs and Gs interface describes.

As shown in Figure 4, be the sketch map of UE in the embodiments of the invention one at E-UTRAN network initiation separation process, comprising:

Step s401, UE send detach request message to MME; In detach request message, carry type of separation, type of separation can be IMSI Detach Only (circuit domain separation), EPS Detach Only (packet domain separation) or Combined IMSI and EPS Detach (circuit domain, packet domain combined separation).

Step s402, MME send the deleting bearing request message to SGW.

MME need judge the type of separation that UE carries in this step in detach request message.If type of separation is IMSI Detach Only, MME will can not send the deleting bearing request message to SGW so.If type of separation is EPS Detach Only or Combined IMSI and EPS Detach, MME need send the deleting bearing request to SGW so.

Step s403, SGW receive among the step s402 MME behind the deleting bearing request message of its transmission, and deleting bearing also returns the deleting bearing response message to MME.

Step s404, MME send to SGSN and separate Indication message.

MME need indicate according to the separation that UE carries in detach request and do different processing in this step:

If 4a) the UE separation indication of in detach request, carrying is IMSI Detach Only; MME need send to SGSN and separate Indication message; And in separating Indication message, increase cell DetachType (type of separation), for example " Detach Type:IMSI Detach Only ".

If 4b) the UE separation indication of in detach request, carrying is EPS Detach Only; Because at E-UTRAN network separate during UE this moment, the E-UTRAN network does not have the business of circuit domain, so when UE indicates type of separation to be EPS Detach Only; Also need UE be separated from circuit domain; Be that MME need send the separation Indication message to SGSN, and in separating Indication message, increase cell, for example " Detach Type:GPRS Detach Only ".

If 4c) the UE separation indication of in detach request, carrying is Combined EPS and IMSIDetach; MME need send to SGSN and separate Indication message; And in separating Indication message, increase cell, for example " Detach Type:Combined GPRS and IMSI Detach ".

Step s405, SGSN send the deleting bearing request message to SGW.Need judge the type of separation of carrying in the separation Indication message of MME transmission at this SGSN.If type of separation is IMSI DetachOnly, SGSN will can not send the deleting bearing request message to SGW so.If type of separation is EPS Detach Only or Combined IMSI and EPS Detach, SGSN need send the deleting bearing request to SGW so.

Step s406, when SGW receives the deleting bearing request message that both sides MME and SGSN send, SGW sends the deleting bearing request message to PGW so.

Step s407, PGW return the deleting bearing response message to SGW.

Step s408, SGW return the deleting bearing response message to SGSN.

Step s409, MME are after receiving the detach request message that UE sends; SGsAP-IMSI-DETACH-INDICATION message is sent in address to the MSC/VLR of its record; When if UE indicates Detach Type to be IMSI Detach Only in detach request message; MME indicates Explicit MS initiated IMSI detach from non-EPS service in above-mentioned message; If UE indicates Detach Type in detach request message be EPS Detach Only or Detach Type when being CombinedEPS and IMSI Detach, MME indicates Combined explicit MSinitiated IMSI detach from EPS and non-EPS services in above-mentioned message.After MSC/VLR receives this message, if the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message that MME sends so.

After step s410, MSC/VLR received step s409 message, if the SGs Interface status is SGs-ASSOCIATED, MSC/VLR was changed to the SGs-NULL state with the SGs interface so, promptly removed SGs and connected.

Step s411～step s412, according to the different situations among the step s404, SGSN sends different separation Indication messages to MSC/VLR.

For 4a) in situation: SGSN receive separate Indication message after; When inspection Detach Type is IMSI Detach Only; SGSN will send BSSAP+-IMSI-DETACH-INDICATION message to the MSC/VLR of record, and in this message, indicate Explicit MSinitiated IMSI detach from non-GPRS service.After MSC/VLR receives this message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.If the Gs interface state is Gs-NULL, MSC/VLR will abandon the BSSAP+-IMSI-DETACH-INDICATION message that SGSN sends so.

For 4b) in situation: when SGSN receiving separate Indication message after; When inspection Detach Type is GPRS Detach Only; SGSN will send BSSAP+-IMSI-DETACH-INDICATION message to the MSC/VLR of its record, and in this message, indicate Combinedexplicit MS initiated IMSI detach from GPRS and non-GPRS services.After MSC/VLR receives this message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.If the Gs interface state is Gs-NULL, MSC/VLR will abandon the BSSAP+-IMSI-DETACH-INDICATION message that SGSN sends so.

For 4c) in situation: SGSN receive separate Indication message after; When inspection Detach Type is Combined GPRS and IMSI Detach; SGSN will send BSSAP+-IMSI-DETACH-INDICATION message to the MSC/VLR of its record, and in this message, indicate Combinedexplicit MS initiated IMSI detach from GPRS and non-GPRS services.After MSC/VLR receives this message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.If the Gs interface state is Gs-NULL, will abandon the BSSAP+-IMSI-DETACH-INDICATION message that SGSN sends so.

If step s413 Gs interface state is Gs-ASSOCIATED, MSC/VLR is changed to the Gs-NULL state with Gs interface so, promptly removes Gs and connects.

Step s414, SGSN return to MME and separate the indication acknowledge message.

Step s415, MME return to separate to UE and accept message.

Need to prove that do not have absolute context separating of the separation of SGs interface and Gs interface in the above-mentioned flow process.The priority of step s410 and step s413 depends on that MSC/VLR receives the message that MME sends earlier and still receives the message that SGSN sends earlier.

As shown in Figure 5, be the sketch map of UE in the embodiments of the invention two at UTRAN/GERAN network initiation separation process, comprising:

Step s501, UE send detach request message to MME, in detach request message, carry type of separation, can be respectively IMSI Detach Only, GPRS Detach Only or Combined GPRS andIMSI Detach.

Step s502, SGSN send the deleting bearing request message to SGW.

SGSN need judge the type of separation that UE carries in this step in detach request message.If type of separation is IMSI Detach Only, SGSN will can not send the deleting bearing request message to SGW so.If type of separation is GPRS Detach Only or Combined GPRS and IMSI Detach, SGSN need send the deleting bearing request to SGW so.

Step s503, SGW receive among the step s502 SGSN behind the deleting bearing request message of its transmission, and deleting bearing also returns the deleting bearing response message to SGSN.

Step s504, SGSN send to MME and separate Indication message.

Need indicate according to the separation that UE carries in detach request in this step and do different processing:

If 4a) the UE separation indication of in detach request, carrying is IMSI Detach Only, SGSN need send to MME and separate Indication message, and in separating Indication message, increases cell, for example " Detach Type:IMSI Detach Only ".

If 4b) the UE separation indication of in detach request, carrying is GPRS Detach Only, SGSN need send to MME and separate Indication message, and in separating Indication message, increases cell, for example " Detach Type:EPS Detach Only ".

If 4c) the UE separation indication of in detach request, carrying is Combined GPRS and IMSIDetach; SGSN need send to MME and separate Indication message; And in separating Indication message, increase cell, for example " Detach Type:Combined EPS and IMSI Detach ".

Step s505, MME send the deleting bearing request message to SGW.

MME need judge the type of separation of carrying in the separation Indication message of SGSN transmission in this step.If type of separation is IMSI Detach Only, MME will can not send the deleting bearing request message to SGW so.If type of separation is EPS Detach Only or Combined EPS and IMSIDetach, MME need send the deleting bearing request to SGW so.

Step s506, when SGW receives the deleting bearing request message that both sides MME and SGSN send, SGW sends the deleting bearing request message to PGW so.

Step s507, PGW return the deleting bearing response message to SGW.

Step s508, SGW return the deleting bearing response message to MME.

Step s509～step s510, SGSN are after receiving the detach request message that UE sends; When if UE indicates Detach Type to be IMSI Detach Only in detach request message; SGSN sends BSSAP+-IMSI-DETACH-INDICATION message to the address of the MSC/VLR of its record; SGSN indicates Explicit MS initiated IMSI detach from non-EPSservice in above-mentioned message; When if UE indicates Detach Type to be Combined GPRS andIMSI Detach in detach request message; SGSN sends BSSAP+-IMSI-DETACH-INDICATION message to the address of the MSC/VLR of its record, and SGSN indicates Combined explicit MS initiated IMSI detach from GPRS and non-GPRS services in above-mentioned message.When if UE indicates Detach Type to be GPRS Detach Only in detach request message; SGSN sends BSSAP+-GPRS-DETACH-INDICATION message to the address of the MSC/VLR of its record, and SGSN is instruct MS initiated IMSI detach from GPRS service in above-mentioned message.After MSC/VLR receives this message, if Gs interface state Gs-NULL, MSC/VLR will abandon the above-mentioned message that SGSN sends so.

After step s511, MSC/VLR receive above-mentioned message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.

Step s512～step s513, according to the different situations among the step s504, MME sends different separation Indication messages to MSC/VLR.

For 4a) in situation: MME receive separate Indication message after; When inspection Detach Type is IMSI Detach Only; MME will send SGsAP-IMSI-DETACH-INDICATION message to the MSC/VLR of its record, and in this message, indicate Explicit MSinitiated IMSI detach from non-EPS service.After MSC/VLR receives this message,, so the SGs interface is changed to the SGs-NULL state if the SGs Interface status is SGs-ASSOCIATED.If the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message that MME sends so.

For 4b) in situation: when MME receiving separate Indication message after; When inspection Detach Type is EPS Detach Only; MME will send SGsAP-EPS-DETACH-INDICATION message to the MSC/VLR of record, and in this message, indicate Explicit MSinitiated IMSI detach from EPS service.After MSC/VLR receives this message,, so the SGs interface is changed to the SGs-NULL state if the SGs Interface status is SGs-ASSOCIATED.If the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-EPS-DETACH-INDICATION message that MME sends so.

For 4c) in situation: MME receive separate Indication message after; When inspection Detach Type is Combined EPS and IMSI Detach; MME will send SGsAP-IMSI-DETACH-INDICATION message to MSC/VLR, and in this message, indicate Combinedexplicit MS initiated IMSI detach from EPS and non-EPS services.After MSC/VLR receives this message,, so the SGs interface is changed to the SGs-NULL state if the SGs Interface status is SGs-ASSOCIATED.If the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message that MME sends so.

If step s514 SGs Interface status is SGs-ASSOCIATED, so the SGs interface is changed to the SGs-NULL state.

Step s515, MME return to SGSN and separate the indication acknowledge message.

Step s516, SGSN return to separate to UE and accept message.

Through the method that provides among embodiments of the invention one and the embodiment two; In user's separation scene that network side is initiated; MME and SGSN are under the situation of not knowing SGs or Gs interface state; Through in separating Indication message, carrying type of separation, can guarantee in the separation process under CS Fallback&ISR scene, guarantee that MSC/VLR can correctly separate user terminal.

Below the separation method under the situation of the change of MME in the processing mode two and SGSN perception SGs and Gs interface is described.

During embodiments of the invention in three, when SGs or Gs interface discharge, on the S3 interface, notify the opposite end by MME or SGSN.Perhaps when MSC/VLR perceives SGs interface or Gs interface release, discharge by MSC/VLR notice MME/SGSN SGs interface or Gs interface.

When being released, shown in Fig. 6 A, comprise by the d/d flow process of MME notice SGSNGs interface by MME notice SGSN Gs interface:

Step s6A01, when Gs interface is released, for example in route district and the location area updating flow process of associating, after MME and MSC/VLR have set up the SGs interface, be released message informing to SGSN by MME transmission Gs interface.

Step s6A02, after SGSN receives above-mentioned message, return Gs interface and discharge acknowledge message.

After the above-mentioned steps, the Gs interface state that write down among the SGSN this moment becomes Gs-NULL.

When being released, shown in Fig. 6 B, comprise by the d/d flow process of MSC/VLR notice SGSN Gs interface by MSC/VLR notice SGSN Gs interface:

Step s6A03, when the Gs state of MSC/VLR record when Gs-ASSOCIATED becomes Gs-NULL, MSC/VLR sends Gs interface and is released message informing SGSN.

Step s6A04, after SGSN receives above-mentioned message, return Gs interface and discharge acknowledge message.

The Gs interface state that write down among the SGSN this moment becomes Gs-NULL.

When being released, shown in Fig. 6 C, comprise by the d/d flow process of SGSN notice MME SGs interface by SGSN notice MME SGs interface:

Step s6B01, when the SGs interface is released, for example in route district and the location area updating flow process of associating, after SGSN and MSC/VLR have set up Gs interface, be released message informing to MME by SGSN transmission Gs interface.

Step s6B02, after MME receives above-mentioned message, return the SGs interface and discharge acknowledge message.

The SGs Interface status that write down among the MME this moment becomes SGs-NULL.

When being released, shown in Fig. 6 D, comprise by the d/d flow process of MSC/VLR notice MME SGs interface by MSC/VLR notice MME SGs interface:.

Step s6B03, when the SGs state of MSC/VLR record when SGs-ASSOCIATED becomes SGs-NULL, MSC/VLR sends the SGs interface and is released message informing MME.

Step s6B04, after MME receives above-mentioned message, return the SGs interface and discharge acknowledge message.

Under the situation shown in above-mentioned Fig. 6 A and Fig. 6 B,

When UE when the E-UTRAN network take place to separate, reference implementation example one Fig. 4:

1, UE sends detach request message to MME, in detach request message, carries type of separation, can be respectively IMSI Detach Only, EPS Detach Only and Combined IMSI and EPSDetach.

2, MME sends the deleting bearing request message to SGW.

3, SGW receives in the step 2 MME behind the deleting bearing request message of its transmission, and deleting bearing also returns the deleting bearing response message to MME.

4, whether MME need send according to the type of separation decision that UE carries in detach request and separate Indication message to SGSN.

4a): when the type of separation of in detach request, carrying as UE is IMSI Detach Only; Because MME perception SGs Interface status is SGs-ASSOCIATED; MME can not send the separation Indication message to SGSN this moment; Simultaneously, the step s405 shown in Fig. 4～s408 and step s411～s414 can not be triggered.MME sends IMSI through the step s409 shown in Fig. 4 to the MSC/VLR of record and separates Indication message.MME returns to separate to UE at the step s415 shown in Fig. 4 and accepts message.

4b): when the type of separation of in detach request, carrying as UE is EPS Detach Only; MME sends to SGSN and separates Indication message; The indication type of separation is GPRSDetach Only in separating Indication message simultaneously; Because MME perception SGs Interface status is SGs-ASSOCIATED; Step s405 shown in Fig. 4～s410 and step s414 and step s415 can be triggered, because SGSN perception Gs interface state is Gs-NULL, so the step s411 shown in Fig. 4～s413 will can not be triggered.

4c): when the type of separation of in detach request, carrying as UE is Combined EPS and IMSI Detach; MME sends to SGSN and separates Indication message; The indication type of separation is Combined EPS and IMSI Detach in separating Indication message simultaneously; Because MME perception SGs Interface status is SGs-ASSOCIATED; Step s405 shown in Fig. 4～s410 and step s414 and step s415 can be triggered, because SGSN perception Gs interface state is Gs-NULL, so the step s411 shown in Fig. 4～s413 will can not be triggered.

When UE when the UTRAN/GERAN network take place to separate, reference implementation example two Fig. 5:

1, UE sends detach request message to SGSN, in detach request message, carries type of separation, can be respectively IMSI Detach Only, GPRS Detach Only and Combined GPRS and IMSIDetach.

2, SGSN sends the deleting bearing request message to SGW.

3, SGW receives in the step 2 SGSN behind the deleting bearing request message of its transmission, and deleting bearing also returns the deleting bearing response message to SGSN.

4, whether SGSN need send according to the type of separation decision that UE carries in detach request and separate Indication message to MME.

4a): when the type of separation of in detach request, carrying as UE is IMSI Detach Only; Because SGSN perception Gs interface state is Gs-NULL; So will sending to MME, SGSN separates Indication message; In this message, carry indication information Detach Type:IMSI Detach Only, the Detach Type in the separation Indication message that MME inspection SGSN sends is IMSI Detach Only, so the step s505 shown in Fig. 5～s511 can not be triggered.DetachType in the separation Indication message that MME inspection SGSN sends is IMSI Detach Only; And the SGs Interface status is SGs-ASSOCIATED; So MME can trigger the step s512 shown in the block diagram 5; S514, s515, s516 notice MSC/VLR separates UE and returns to UE and separate and accept message.

4b): when the type of separation of in detach request, carrying as UE is GPRS Detach Only; SGSN sends to MME and separates Indication message; And the indication type of separation is EPSDetach Only in separating Indication message; The MME perception separates that type of separation is EPS Detach Only in the indication, and the SGs Interface status is SGs-ASSOCIATED, so the step s505 shown in Fig. 5～s508 and s513～s516 can be triggered; And because SGSN perception Gs interface state is Gs-NULL; So the step s509 shown in Fig. 5～s511 can not trigger, and type of separation is EPSDetach Only in the indication because the MME perception separates, so the step s512 shown in Fig. 5 can not be triggered.

4c): when the type of separation of in detach request, carrying as UE is Combined GPRS and IMSIDetach; SGSN sends to MME and separates Indication message; And the indication type of separation is Combined GPRS and IMSI Detach in separating Indication message; MME inspection separates that type of separation is Combined GPRS and IMSI Detach in the indication, and the SGs Interface status is SGs-ASSOCIATED, so the step s505 shown in Fig. 5～s508 and step s512, s514～s516 can be triggered; And because SGSN perception Gs interface state is Gs-NULL; So the step s509 shown in Fig. 5～s511 can not trigger, and type of separation is Combined GPRS and IMSIDetach in the indication because the MME perception separates, so the step s513 shown in Fig. 5 can not be triggered.

Under the situation shown in above-mentioned Fig. 6 C and Fig. 6 D:

2, MME sends the deleting bearing request message to SGW.

4a): when the type of separation of in detach request, carrying as UE is IMSI Detach Only; Because MME perception SGs Interface status is SGs-NULL; MME sends the separation Indication message to SGSN this moment; The type of separation that the SGSN inspection separates in the Indication message is IMSI Detach Only, so the step s405 shown in Fig. 4～s410 can not be triggered.The type of separation that the SGSN inspection separates in the Indication message is IMSIDetach Only; And the Gs interface state is Gs-ASSOCIATED, and the step s411 shown in SGSN triggering Fig. 4, s413, s414, s415 return to separate to the MSC/VLR of record transmission IMSI separation Indication message and to UE and accept message.Because the type of separation that the SGSN inspection separates in the Indication message is IMSIDetach Only, so the step s412 shown in Fig. 4 can not be triggered.

4b): when the type of separation of in detach request, carrying as UE is EPS Detach Only; MME sends to SGSN and separates Indication message; The indication type of separation is GPRSDetach Only in separating Indication message simultaneously; Because SGSN perception Gs interface state is Gs-ASSOCIATED, and the type of separation of separating in the indication is GPRS Detach Only, so the step s405 shown in Fig. 4～s408 and s412～s415 can be triggered; Because MME perception SGs Interface status is SGs-NULL, so step s409 shown in Fig. 4 and s410 will can not be triggered.Because the type of separation that the SGSN inspection separates in the Indication message is EPS Detach Only, so the step s411 shown in Fig. 4 can not be triggered.

4c): when the type of separation of in detach request, carrying as UE is Combined EPS and IMSI Detach; MME sends to SGSN and separates Indication message; The indication type of separation is Combined EPS and IMSI Detach in separating Indication message simultaneously; Because SGSN perception Gs interface state is Gs-ASSOCIATED, and the type of separation of separating in the indication is Combined EPS and IMSIDetach, and the step s405 shown in Fig. 4～s408, s411, s413～s415 can be triggered; Because MME perception SGs Interface status is SGs-NULL, so step s409 shown in Fig. 4 and s410 will can not be triggered.Because the type of separation that the SGSN inspection separates in the Indication message is Combined EPS andIMSI Detach, so the step s412 shown in Fig. 4 can not be triggered.

2, SGSN sends the deleting bearing request message to SGW.

4a): when the type of separation of in detach request, carrying as UE is IMSI Detach Only; Because SGSN perception Gs interface state is Gs-ASSOCIATED; The step s505 shown in Fig. 5～s508 and s512～s515 so not sending to MME, SGSN do not separate Indication message, so can not be triggered.When the separation indication that SGSN inspection UE carries in detach request message is IMSI Detach Only; Trigger the step s509 shown in Fig. 5, s511, s516 and send IMSI to the MSC/VLR of record and separate Indication message, notice MSC/VLR separates UE and returns to UE and separate and accept message.And the step s510 shown in Fig. 5 can not be triggered.

4b): when the type of separation of in detach request, carrying as UE is GPRS Detach Only; SGSN sends to MME and separates Indication message; And the indication type of separation is EPSDetach Only in separating Indication message, and SGSN perception Gs interface state is Gs-ASSOCIATED, so the step s505 shown in Fig. 5～s508, s510, s511, s515, s516 can be triggered; And because MME perception SGs Interface status is SGs-NULL; So the step s512 shown in Fig. 5～s514 can not trigger, and type of separation is EPS Detach Only in the indication because the SGSN perception separates, so the step s509 shown in Fig. 5 can not be triggered.

4c): when the type of separation of in detach request, carrying as UE is Combined GPRS and IMSIDetach; SGSN sends to MME and separates Indication message; And the indication type of separation is Combined GPRS and IMSI Detach in separating Indication message; SGSN inspection Gs interface state is Gs-ASSOCIATED; So the step s505 shown in Fig. 5～s509, s511, s515 and s516 can be triggered, and because MME perception SGs Interface status is SGs-NULL, so the step s512 shown in Fig. 5～s514 can not trigger; Type of separation is Combined GPRSand IMSI Detach in the indication because the SGSN perception separates, so the step s510 shown in Fig. 5 can not be triggered.

Through the method that provides in the embodiments of the invention three, in user's separation scene that network side is initiated, when SGs or Gs interface are released; MME or SGSN can access corresponding notice; According to the state of interface, MME or SGSN judge whether to send and separate Indication message, and in the separation Indication message that sends, carry type of separation; Can guarantee to guarantee that MSC/VLR can correctly separate user terminal in the branch reason flow process under CS Fallback&ISR scene.

The scene that the user who initiates for network side separates mainly is that SGSN, MME and HSS (HomeSubscriber Server, home subscriber server) initiate.User's separation scene that network side is initiated is just separated UE in packet domain, so do not exist similar circuit domain in the separation scene of initiating with UE to separate the scene with circuit domain packet domain combined separation.

In the embodiments of the invention four, MME is as shown in Figure 7 in the scene of packet domain separation with UE, comprising:

Step s701, when MME begins to carry out UE and separates; MME sends Detachindication message to SGSN; In this message, increase cell " Detach Type:GPRS Detach Only ", perhaps another one indication information element indication SGSN sends BSSAP+-GPRS-DETACH-INDICATION message to MSC.

Step s702, when SGSN receives the Detach indication message that MME sends; Cell Detach Type:GPRS Detach or indication information element according to wherein send BSSAP+-GPRS-DETACH-INDICATION message to MSC/VLR, and in this message, indicate ExplicitMS initiated IMSI detach from GPRS service.After MSC/VLR receives this message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.If the Gs interface state is Gs-NULL, MSC/VLR will abandon the BSSAP+-GPRS-DETACH-INDICATION message that SGSN sends so.

Step s703, MME send SGsAP-IMSI-DETACH-INDICATION message to the address of the MSC/VLR of its record, and MME indicates Combinedexplicit MS initiated IMSI detach from EPS and non-EPS services in above-mentioned message.After MSC/VLR receives this message,, so the SGs interface is changed to the SGs-NULL state if the SGs Interface status is SGs-ASSOCIATED.If the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message that MME sends so.

Step s704, SGSN return Detach indication Ack message to MME.

Also can be in this flow process according to the method for embodiment three, MME and SGSN are respectively by the state of notice SGs interface and Gs interface.Promptly 1) when MME was notified the SGs Interface status to be SGs-NULL, MME can not trigger step s703.2) when SGSN was notified the Gs interface state to be converted into Gs-NULL, SGSN can not trigger step s702.

In the embodiments of the invention four, SGSN is as shown in Figure 8 in the scene of packet domain separation with UE, comprising:

Step s801, when SGSN begins to carry out UE and separates; SGSN sends Detachindication message to MME; In this message, increase cell " Detach Type:EPS Detach Only ", perhaps another one indication information element indication MME sends SGsAP+-EPS-DETACH-INDICATION message to MSC.

Step s802, when MME receiving separate Indication message after; According to cell DetachType:EPS Detach or indication information element wherein; MME will send SGsAP-EPS-DETACH-INDICATION message to the MSC/VLR of record, and in this message, indicate Explicit MSinitiated IMSI detach from EPS service.After MSC/VLR receives this message,, so the SGs interface is changed to the SGs-NULL state if the SGs Interface status is SGs-ASSOCIATED.If the SGs Interface status is SGs-NULL, MSC/VLR will abandon the SGsAP-EPS-DETACH-INDICATION message that MME sends so.

Step s803, SGSN send BSSAP+-GPRS-DETACH-INDICATION message to the address of the MSC/VLR of its record, and SGSN indicates MSinitiated IMSI detach from GPRS service in above-mentioned message.After MSC/VLR receives this message,, so Gs interface is changed to the Gs-NULL state if the Gs interface state is Gs-ASSOCIATED.If Gs interface state Gs-NULL, MSC/VLR will abandon the above-mentioned message that SGSN sends so.

Step s804, MME return Detach indication Ack message to SGSN.

Also can be in this flow process according to the method for embodiment three, MME and SGSN are respectively by the state of notice SGs interface and Gs interface.Promptly 1) when SGSN was notified the Gs interface state to be Gs-NULL, SGSN can not trigger step s803.2) when MME was notified the SGs Interface status to be converted into SGs-NULL, MME can not trigger step s802.

Through the method that provides in the embodiments of the invention four; In user's separation scene that network side is initiated; Through in separating Indication message, carrying type of separation; Can guarantee to guarantee that MSC/VLR can correctly separate user terminal in the branch reason flow process under CS Fallback&ISR scene.

Also comprise:

User terminal is used for sending the detach request of carrying type of separation to said first Mobility Management Entity.

The signaling plane controlled entity of circuit domain, the signaling plane controlled entity of said circuit domain and/or second Mobility Management Entity also are used for sending SGs interface release message or Gs interface release message to said first Mobility Management Entity.

Said second Mobility Management Entity; Whether separation Indication message that also is used for sending according to said first Mobility Management Entity and SGs interface or Gs interface are released, and judge whether to send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.

Said first Mobility Management Entity; Also be used for type of separation according to the detach request of user terminal transmission; And whether SGs interface or Gs interface are released; Judge whether to carry the separation Indication message of type of separation, or do not send the separation Indication message of correspondence to the signaling plane controlled entity of circuit domain to said second Mobility Management Entity transmission.

Concrete, said first Mobility Management Entity is that MME, said second Mobility Management Entity are SGSN; Or said first Mobility Management Entity is that SGSN, said second Mobility Management Entity are MME.

Embodiments of the invention also provide a kind of first Mobility Management Entity, are used for the separation of user terminal at the professional passback system of circuit domain CS network, and are as shown in Figure 9, comprising:

Separate Indication message generation unit 11, be used to generate the separation Indication message that carries type of separation; Separating Indication message generation unit 11 specifically can be used for: the type of separation of the detach request of sending according to user terminal generates and carries the separation Indication message of type of separation; Or initiatively the separation Indication message of type of separation is carried in generation.

Separate Indication message transmitting element 12, be used for said separation Indication message is sent to second Mobility Management Entity, according to the type of separation of carrying in the said separation Indication message user terminal is separated to indicate second Mobility Management Entity.

Also comprise:

Deleting bearing request transmitting unit 13; The type of separation of the detach request that is used for sending when said user terminal is that packet domain is separated or during circuit domain packet domain combined separation; Send the deleting bearing request message to gateway equipment, and receive the deleting bearing response that said gateway equipment sends.

Interface release message receiving element 14 is used to receive SGs interface release message or Gs interface release message that the signaling plane controlled entity of second Mobility Management Entity or circuit domain sends, confirms whether SGs interface or Gs interface are released.

Above-mentioned separation Indication message generation unit 11 specifically can also be used for: the type of separation of the detach request of sending according to user terminal; And whether SGs interface or Gs interface are released; Judge whether to generate the separation Indication message that carries type of separation that sends to second Mobility Management Entity, or generation is not to the separation Indication message of the correspondence of the signaling plane controlled entity transmission of circuit domain.

Embodiments of the invention also provide a kind of second Mobility Management Entity, are used for the separation of user terminal at the professional passback system of circuit domain CS network, and are shown in figure 10, comprising:

Separate Indication message receiving element 21, be used to receive the separation Indication message that first Mobility Management Entity sends;

Separate Indication message transmitting element 22, be used for the type of separation according to said separation Indication message, the signaling plane controlled entity to the CS territory sends corresponding separation Indication message.

Also comprise:

Interface release message transmitting element 23 is used for sending SGs interface release message or Gs interface release message to said first Mobility Management Entity, and whether definite SGs interface or Gs interface are released.

Concrete; Said separation Indication message transmitting element 21 specifically can be used for: according to the type of separation of said separation Indication message; And whether SGs interface or Gs interface be released, and judges whether to send corresponding separation Indication message to the signaling plane controlled entity in CS territory.

System that the embodiment of the application of the invention provides and equipment; First Mobility Management Entity carries type of separation at the separation Indication message that sends to second Mobility Management Entity; Make second Mobility Management Entity carry out separating treatment to user terminal, can guarantee correctly user terminal to be separated in the separation process under CS Fallback&ISR scene according to the type of separation of carrying in the said separation Indication message.

Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize through hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding; Technical scheme of the present invention can be come out with the embodied of software product, this software product can be stored in a non-volatile memory medium (can be CD-ROM, USB flash disk; Portable hard drive etc.) in; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.

More than disclosedly be merely several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.

Claims

1. the separation method of the professional passback system of a circuit domain CS network is characterized in that, comprising:

First Mobility Management Entity generates and carries the separation Indication message of type of separation, comprising: said first Mobility Management Entity generates and carries the separation Indication message of type of separation according to the type of separation in the detach request of user terminal transmission; Or said first Mobility Management Entity initiatively generates the separation Indication message that carries type of separation;

Said first Mobility Management Entity sends said separation Indication message to second Mobility Management Entity, user terminal is separated according to the type of separation of carrying in the said separation Indication message to indicate second Mobility Management Entity;

Wherein, said second Mobility Management Entity separates user terminal according to the type of separation in the said separation Indication message, comprising: the signaling plane controlled entity to circuit domain sends corresponding separation indication.

2. the method for claim 1 is characterized in that, also comprises:

When the type of separation in the detach request that said user terminal sends is packet domain separation or circuit domain packet domain combined separation; Said first Mobility Management Entity sends the deleting bearing request message to gateway equipment, and receives the deleting bearing response that said gateway equipment sends.

3. the method for claim 1 is characterized in that, said second Mobility Management Entity also comprises after receiving the separation Indication message that carries type of separation that said first Mobility Management Entity sends:

When the type of separation in the said separation Indication message is packet domain separation or circuit domain packet domain combined separation; Said second Mobility Management Entity sends the deleting bearing request message to gateway equipment, and receives the deleting bearing response that said gateway equipment sends.

4. the method for claim 1 is characterized in that, said first Mobility Management Entity also comprises before generating the separation Indication message that carries type of separation:

Said first Mobility Management Entity receives the SGs interface release message of the signaling plane controlled entity transmission of said second Mobility Management Entity or circuit domain; Or

Said first Mobility Management Entity receives the Gs interface release message of the signaling plane controlled entity transmission of said second Mobility Management Entity or circuit domain.

5. method as claimed in claim 4 is characterized in that, said first Mobility Management Entity also comprises after receiving said SGs interface release message or Gs interface release message:

Type of separation in the detach request message that said first Mobility Management Entity sends according to said user terminal, and whether SGs interface or Gs interface be released, and judges whether to send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.

6. method as claimed in claim 5 is characterized in that, said first Mobility Management Entity generates the separation Indication message that carries type of separation and comprises:

Said first Mobility Management Entity is according to the type of separation in the detach request of user terminal transmission; And whether SGs interface or Gs interface are released; Judging whether to send to said second Mobility Management Entity and carry the separation Indication message of type of separation, is then to generate the separation Indication message that carries type of separation if be judged as.

7. method as claimed in claim 6 is characterized in that, said first Mobility Management Entity also comprises after second Mobility Management Entity sends said separation Indication message:

Said second Mobility Management Entity is according to the type of separation in the said separation Indication message, and whether SGs interface or Gs interface be released, and judges whether to send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.

8. like each described method in the claim 1 to 7, it is characterized in that said first Mobility Management Entity is that Mobility Management Entity MME, said second Mobility Management Entity are Serving GPRS Support Node SGSN; Or said first Mobility Management Entity is that SGSN, said second Mobility Management Entity are MME.

9. the piece-rate system of the professional passback system of circuit domain CS network comprises:

First Mobility Management Entity is used to generate the separation Indication message that carries type of separation; And said separation Indication message sent to second Mobility Management Entity; Wherein, said first Mobility Management Entity generates the separation Indication message that carries type of separation and comprises: said first Mobility Management Entity generates and carries the separation Indication message of type of separation according to the type of separation in the detach request of user terminal transmission; Or said first Mobility Management Entity initiatively generates the separation Indication message that carries type of separation;

Second Mobility Management Entity is used for according to the type of separation of said separation Indication message user terminal being separated, and comprising: the signaling plane controlled entity to circuit domain sends corresponding separation indication.

10. system as claimed in claim 9; It is characterized in that; The signaling plane controlled entity that also comprises circuit domain; The signaling plane controlled entity of said second Mobility Management Entity and/or circuit domain also is used for sending SGs interface release message or Gs interface release message to said first Mobility Management Entity.

11. system as claimed in claim 10; It is characterized in that; Said second Mobility Management Entity; Whether separation Indication message that also is used for sending according to said first Mobility Management Entity and SGs interface or Gs interface are released, and judge whether to send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.

12. system as claimed in claim 10; It is characterized in that; Said first Mobility Management Entity, the type of separation of the detach request that also is used for sending according to user terminal, and whether SGs interface or Gs interface are released; Judge whether to carry the separation Indication message of type of separation, or do not send the separation Indication message of correspondence to the signaling plane controlled entity of circuit domain to said second Mobility Management Entity transmission.

13., it is characterized in that said first Mobility Management Entity is that MME, said second Mobility Management Entity are SGSN like each described system in the claim 9 to 12; Or said first Mobility Management Entity is that SGSN, said second Mobility Management Entity are MME.

14. a Mobility Management Entity is used for the separation of user terminal at the professional passback system of circuit domain CS network, it is characterized in that, comprising:

Separate the Indication message generation unit, be used to generate the separation Indication message that carries type of separation; Said separation Indication message generation unit specifically is used for: the type of separation of the detach request of sending according to user terminal generates and carries the separation Indication message of type of separation; Or initiatively the separation Indication message of type of separation is carried in generation;

Separate the Indication message transmitting element, be used for said separation Indication message is sent to second Mobility Management Entity, according to the type of separation of carrying in the said separation Indication message user terminal is separated to indicate second Mobility Management Entity;

15. Mobility Management Entity as claimed in claim 14 is characterized in that, also comprises:

The deleting bearing request transmitting unit; The type of separation of the detach request that is used for sending when said user terminal is that packet domain is separated or during circuit domain packet domain combined separation; Send the deleting bearing request message to gateway equipment, and receive the deleting bearing response that said gateway equipment sends.

16. Mobility Management Entity as claimed in claim 14 is characterized in that, also comprises:

Interface release message receiving element is used to receive SGs interface release message or Gs interface release message that the signaling plane controlled entity of second Mobility Management Entity or circuit domain sends, confirms whether SGs interface or Gs interface are released.

17. Mobility Management Entity as claimed in claim 16; It is characterized in that; Said separation Indication message generation unit also is used for: the type of separation of the detach request of sending according to user terminal; And whether SGs interface or Gs interface be released, and judges whether to send to said second Mobility Management Entity to carry the separation Indication message of type of separation, or do not send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.

18. a Mobility Management Entity is used for the separation of user terminal at the professional passback system of circuit domain CS network, it is characterized in that, comprising:

Separate the Indication message receiving element, be used to receive the separation Indication message that first Mobility Management Entity sends; Wherein, said first Mobility Management Entity generates the separation Indication message that carries type of separation and comprises: said first Mobility Management Entity generates and carries the separation Indication message of type of separation according to the type of separation in the detach request of user terminal transmission; Or said first Mobility Management Entity initiatively generates the separation Indication message that carries type of separation;

19. Mobility Management Entity as claimed in claim 18 is characterized in that, also comprises:

Interface release message transmitting element is used for sending SGs interface release message or Gs interface release message to said first Mobility Management Entity, and whether definite SGs interface or Gs interface are released.

20. Mobility Management Entity as claimed in claim 18; It is characterized in that; Said separation Indication message transmitting element specifically is used for: according to the type of separation of said separation Indication message; And whether SGs interface or Gs interface be released, and judges whether to send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.