CN102984776B - The separation method of circuit switched domain (CS) service fallback conventional network, system and equipment - Google Patents
The separation method of circuit switched domain (CS) service fallback conventional network, system and equipment Download PDFInfo
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Abstract
Embodiments of the invention disclose a kind of circuit domain CS business and return the separation method of legacy network, system and equipment.The method comprises: the first Mobility Management Entity generates the separation Indication message carrying type of separation; Described first Mobility Management Entity sends described separation Indication message to the second Mobility Management Entity, is separated according to the type of separation of carrying in described separation Indication message to indicate the second Mobility Management Entity to user terminal.The embodiment of the application of the invention; the separation Indication message that first Mobility Management Entity is sending to the second Mobility Management Entity carries type of separation; the second Mobility Management Entity is made to carry out separating treatment according to the type of separation of carrying in described separation Indication message to user terminal, can ensure at CS? Fallback & amp; Correctly user terminal is separated in separation process under ISR scene.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of separation method of circuit switched domain (CS) service fallback conventional network, system and equipment.
Background technology
GPRS (GeneralPacketRadioService, GPRS)/UMTS (UniversalMobileTelecommunicationsSystem, universal mobile telecommunications system) be 3GPP (The3rdGenerationPartnershipProject, third generation Partnership Program) tissue definition a kind of mobile communications network, it comprises RAN (RadioAccessNetwork, Radio Access Network) and CN (CoreNetwork, core network) two parts.CN is logically divided into CS (CircuitSwitchedDomain, circuit commutative field) and PS (PacketSwitchedDomain, packet-switched domain).The main processed voice business in CS territory, PS territory mainly processes Packet Service.The signaling plane controlled entity in CS territory is MSC (MobileSwitchCenter, mobile switching centre)/VLR (VisitorLocationRegister, VLR Visitor Location Register), the signaling plane controlled entity in PS territory is SGSN (ServingGPRSSupportNode, Serving GPRS Support Node).
As shown in Figure 1, SGSN is as the chain of command entity in PS territory, can be connected by Gs interface with MSC/VLR, by A interface and BSC (BaseStationController, base station controller) connect, connected, for GPRS/UMTS provides data service service by Iu interface and RNC (RadioNetworkController, radio network controller).UE (UserEquipment, subscriber equipment) is generally referred to as gprs service when completing PS business by the A interface access SGSN of BSC; And UE is generally referred to as UMTS business when completing PS business by the Iu interface of RNC access SGSN.
In order to tackle the challenge of wireless broad band technology, keep the leading superiority of 3GPP network, 3GPP has formulated LTE (LongTermEvolution, Long Term Evolution) plan.To give a definition in the guidance of this evolution plan the framework of new mobile communications network, this framework is more flat compared with present GPRS/UMTS, and only remain packet domain, also can be called EPS (EvolvedPacketSystem, the packet network of evolution).
The core net of wireless evolution network mainly comprises MME (MobilityManagementEntity, mobile management entity), S-GW (ServingGateway gateway) and P-GW (PacketDataNetworkGateway, grouped data network gateway) three logical functionality, wherein MME is responsible for NAS signaling and the function such as the encryption of NAS signaling and roaming, tracking, distributing user temporary identifications, safety function etc., it corresponds to the control plane part of the inner SGSN of current UMTS system.S-GW is responsible for mobility anchor point and the Lawful Interception relevant information of local mobility anchor point and 3GPP internal system; P-GW is responsible for strategy execution and charging and Lawful Interception correlation function.
Because a lot of business of operator all operates in the circuit domain of GPRS/UMTS, in order to reuse existing CS business in EPS network, propose the method being connected to CS domain core net by EPS network, as shown in Figure 2, the MME in EPS network is connected on the MSC of traditional C/S core net by a SGs interface.
Under this architecture, when UE prepares MO (MobileOriginating the begins to exhale) business initiating CS territory, UE needs first to forward GPRS/UMTS network to, selects the community of a 2G/3G to be stationed, and then carries out MO business.When MSC receives a MT (MobileTerminated, exhale eventually) business time, MSC sends beep-page message by SGs interface to MME, MME carries out paging by EPS network to UE, after UE receives this beep-page message, need first to forward GPRS/UMTS network to, select the community of a 2G/3G to be stationed, and then complete the subsequent treatment of this MT business.This framework and processing method can be called CSfallback, and namely CS business returns legacy network process.
Another demand of evolvement network realizes ISR (Idle-modeSignallingReduction, saving signaling under idle pulley or limitation signaling) function, its main purpose is the mobile management flow process of UE between different access networks (as reduced the Inter3GPPAccessSystemMobilityinIdleState process between GERAN/UTRAN and EUTRAN) under minimizing idle pulley.The solution of the ISR mechanism between current 3GPP access network is two login mechanisms, namely UE registers at two different access networks, will not trigger Inter3GPPAccessSystemMobility flow process when the UE under such idle pulley moves between these two access networks.
At E-UTRAN (EvolvedUMTSTerritorialRadioAccessNetwork, the universal mobile telecommunications system land radio access web of evolution) in network, when UE initiate one combine attachment or co-location district more new technological process time, if MME supports SGs interface, the SGs that MME can be saved in MSC for UE in described flow process associates.Now the state of MME record is SGs-ASSOCIATED.Same, the state of MSC/VLR record is also SGs-ASSOCIATED.MME and MSC/VLR also needs to preserve address mutually simultaneously.
In GERAN/UTRAN network, when UE initiate one combine attachment or co-location district more new technological process, if SGSN support Gs interface, in described flow process SGSN can for UE be saved in MSC Gs associate.Now the state of SGSN record is Gs-ASSOCIATED.Same, the state of MSC/VLR record is also Gs-ASSOCIATED.SGSN and MSC/VLR also needs to preserve address mutually simultaneously.The access network elements of GERAN/UTRAN network possesses the different interface of two covers, namely also can access packet domain in place in circuit territory.
Inventor is realizing in process of the present invention, find that implementation of the prior art exists following problem: under the scene of CSfallback and ISR, due to when SGs or Gs interface change, MME and SGSN not perception, so cannot be separated UE by correct notice MSC/VLR.
Summary of the invention
Embodiments of the invention provide a kind of separation method of circuit switched domain (CS) service fallback conventional network, system and equipment, to realize can being correctly separated by user terminal in the sub-argument flow process under CSFallback & 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 the separation Indication message carrying type of separation;
Described first Mobility Management Entity sends described separation Indication message to the second Mobility Management Entity, is separated according to the type of separation of carrying in described separation Indication message to indicate the second Mobility Management Entity to user terminal.
Embodiments of the invention also provide a kind of circuit domain CS business to return the piece-rate system of legacy network, comprising:
First Mobility Management Entity, for generating the separation Indication message carrying type of separation; And described separation Indication message is sent to the second Mobility Management Entity;
Second Mobility Management Entity, for being separated user terminal according to the type of separation of carrying in described separation Indication message.
Embodiments of the invention also provide a kind of Mobility Management Entity, return the separation of legacy network, comprising for user terminal in circuit domain CS business:
Be separated instruction message generation unit, for generating the separation Indication message carrying type of separation;
Be separated instruction message sending unit, for described separation Indication message is sent to the second Mobility Management Entity, according to the type of separation of carrying in described separation Indication message, user terminal be separated to indicate the second Mobility Management Entity.
Embodiments of the invention also provide a kind of Mobility Management Entity, return the separation of legacy network, comprising for user terminal in circuit domain CS business:
Be separated instruction message reception units, for receiving the separation Indication message that the first Mobility Management Entity sends;
Be separated instruction message sending unit, for according to the type of separation in described separation Indication message, to the separation Indication message that the signaling plane controlled entity transmission of circuit domain is corresponding.
Compared with prior art, embodiments of the invention have the following advantages:
The separation Indication message that first Mobility Management Entity is sending to the second Mobility Management Entity carries type of separation, make the second Mobility Management Entity carry out separating treatment according to the type of separation of carrying in described separation Indication message to user terminal, can ensure correctly user terminal to be separated in the separation process under CSFallback & ISR scene.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the GPRS/UMTS network architecture in prior art;
Fig. 2 is the schematic diagram of the EPS network architecture in prior art;
Fig. 3 is the separation method flow chart that in embodiments of the invention, circuit domain CS business returns legacy network;
Fig. 4 is the schematic diagram that in embodiments of the invention one, UE initiates separation process at E-UTRAN network;
Fig. 5 is the schematic diagram that in embodiments of the invention two, UE initiates separation process at UTRAN/GERAN network;
Fig. 6 A to Fig. 6 D notifies the d/d flow chart of SGSN and MME interface in embodiments of the invention three;
Fig. 7 is the user terminal separation process figure that in embodiments of the invention four, MME initiates;
Fig. 8 is the user terminal separation process figure that in embodiments of the invention four, SGSN initiates;
Fig. 9 is the structural representation of the first Mobility Management Entity in embodiments of the invention;
Figure 10 is the structural representation of the second Mobility Management Entity in embodiments of the invention.
Embodiment
Embodiments of the invention provide a kind of circuit domain CS business to return the separation method of legacy network, as shown in Figure 3, comprising:
Step s301, the first Mobility Management Entity generate the separation Indication message carrying type of separation.
Step s302, the first Mobility Management Entity send described separation Indication message to the second Mobility Management Entity, are separated according to the type of separation of carrying in described separation Indication message to indicate the second Mobility Management Entity to user terminal.
The embodiment of the application of the invention, the separation Indication message that first Mobility Management Entity is sending to the second Mobility Management Entity carries type of separation, make the second Mobility Management Entity carry out separating treatment according to the type of separation of carrying in described separation Indication message to user terminal, can ensure correctly user terminal to be separated in the separation process under CSFallback & ISR scene.
Concrete, the circuit domain CS business of the embodiment of the present invention is returned in the separation method of legacy network, mainly comprises two kinds of processing modes.In the first processing mode, as MME and the SGSN of Mobility Management Entity when the change of not perception SGs and Gs interface, realize the separation of user terminal; In the second processing mode, as MME and the SGSN of Mobility Management Entity when the change of perception SGs and Gs interface, realize the separation of user terminal; Below in conjunction with specific embodiment, above-mentioned two kinds of processing modes are described respectively.
First the situation of the change of MME and SGSN not perception SGs and Gs interface in processing mode one is described.
As shown in Figure 4, for UE in embodiments of the invention one is at the schematic diagram of 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 IMSIDetachOnly (circuit domain separation), EPSDetachOnly (packet domain separation) or CombinedIMSIandEPSDetach (circuit domain, packet domain combined separation).
Step s402, MME send deleting bearing request message to SGW.
In this step, MME needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so MME can not send deleting bearing request message to SGW.If type of separation is EPSDetachOnly or CombinedIMSIandEPSDetach, so MME needs to send deleting bearing request to SGW.
Step s403, SGW receive in step s402 that MME is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to MME.
Step s404, MME send to SGSN and are separated Indication message.
In this step, MME needs the separation instruction of carrying in detach request according to UE to do different process:
If the separation instruction that 4a) UE carries in detach request is IMSIDetachOnly, MME needs to send to SGSN to be separated Indication message, and in separation Indication message, increase cell DetachType (type of separation), such as " DetachType:IMSIDetachOnly ".
If the separation instruction that 4b) UE carries in detach request is EPSDetachOnly, be separated at E-UTRAN network due to during now UE, E-UTRAN network does not have the business of circuit domain, so when UE indicates type of separation to be EPSDetachOnly, also UE is needed to be separated from circuit domain, namely MME needs to send to SGSN to be separated Indication message, and increases cell, such as " DetachType:GPRSDetachOnly " in separation Indication message.
If the separation instruction that 4c) UE carries in detach request is CombinedEPSandIMSIDetach, MME needs to send to SGSN to be separated Indication message, and in separation Indication message, increase cell, such as " DetachType:CombinedGPRSandIMSIDetach ".
Step s405, SGSN send deleting bearing request message to SGW.The type of separation of carrying in the separation Indication message judging that MME sends is needed at this SGSN.If type of separation is IMSIDetachOnly, so SGSN can not send deleting bearing request message to SGW.If type of separation is EPSDetachOnly or CombinedIMSIandEPSDetach, so SGSN needs to send deleting bearing request to SGW.
Step s406, when SGW receives the deleting bearing request message that both sides MME and SGSN sends, so SGW sends deleting bearing request message to PGW.
Step s407, PGW return deleting bearing response message to SGW.
Step s408, SGW return deleting bearing response message to SGSN.
Step s409, MME is after the detach request message receiving UE transmission, address to the MSC/VLR of its record sends SGsAP-IMSI-DETACH-INDICATION message, if when UE indicates DetachType to be IMSIDetachOnly in detach request message, MME indicates ExplicitMSinitiatedIMSIdetachfromnon-EPSservice in above-mentioned message, if UE indicates DetachType to be EPSDetachOnly or DetachType in detach request message when being CombinedEPSandIMSIDetach, MME indicates CombinedexplicitMSinitiatedIMSIdetachfromEPSandnon-EPSse rvices in above-mentioned message.After MSC/VLR receives this message, if SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message of MME transmission.
After step s410, MSC/VLR receive step s409 message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state by MSC/VLR, namely removes SGs and connects.
Step s411 ~ step s412, according to the different situations in step s404, SGSN sends different separation Indication messages to MSC/VLR.
For 4a) in situation: SGSN is separated after Indication message receiving, when checking that DetachType is IMSIDetachOnly, MSC/VLR to record is sent BSSAP+-IMSI-DETACH-INDICATION message by SGSN, and indicates ExplicitMSinitiatedIMSIdetachfromnon-GPRSservice in this message.After MSC/VLR receives this message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.If Gs interface state is Gs-NULL, so MSC/VLR will abandon the BSSAP+-IMSI-DETACH-INDICATION message of SGSN transmission.
For 4b) in situation: when SGSN is separated after Indication message receiving, when checking that DetachType is GPRSDetachOnly, the MSC/VLR recorded to it is sent BSSAP+-IMSI-DETACH-INDICATION message by SGSN, and indicates CombinedexplicitMSinitiatedIMSIdetachfromGPRSandnon-GPRS services in this message.After MSC/VLR receives this message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.If Gs interface state is Gs-NULL, so MSC/VLR will abandon the BSSAP+-IMSI-DETACH-INDICATION message of SGSN transmission.
For 4c) in situation: SGSN is separated after Indication message receiving, when checking that DetachType is CombinedGPRSandIMSIDetach, the MSC/VLR recorded to it is sent BSSAP+-IMSI-DETACH-INDICATION message by SGSN, and indicates CombinedexplicitMSinitiatedIMSIdetachfromGPRSandnon-GPRS services in this message.After MSC/VLR receives this message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.If Gs interface state is Gs-NULL, so the BSSAP+-IMSI-DETACH-INDICATION message of SGSN transmission will be abandoned.
If step s413 Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state by MSC/VLR, namely removes Gs and connects.
Step s414, SGSN return to MME and are separated instruction acknowledge message.
Step s415, MME return separation to UE and accept message.
It should be noted that, in above-mentioned flow process, the separation of SGs interface does not have absolute context with being separated of Gs interface.The priority of step s410 and step s413 depends on that MSC/VLR first receives message that MME sends and still first receives the message that SGSN sends.
As shown in Figure 5, for UE in embodiments of the invention two is at the schematic diagram of 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 IMSIDetachOnly, GPRSDetachOnly or CombinedGPRSandIMSIDetach respectively.
Step s502, SGSN send deleting bearing request message to SGW.
In this step, SGSN needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so SGSN can not send deleting bearing request message to SGW.If type of separation is GPRSDetachOnly or CombinedGPRSandIMSIDetach, so SGSN needs to send deleting bearing request to SGW.
Step s503, SGW receive in step s502 that SGSN is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to SGSN.
Step s504, SGSN send to MME and are separated Indication message.
The separation instruction of carrying in detach request according to UE is needed to do different process in this step:
Need to send to MME to be separated Indication message if the separation instruction that 4a) UE carries in detach request is IMSIDetachOnly, SGSN, and increase cell, such as " DetachType:IMSIDetachOnly " in separation Indication message.
Need to send to MME to be separated Indication message if the separation instruction that 4b) UE carries in detach request is GPRSDetachOnly, SGSN, and increase cell, such as " DetachType:EPSDetachOnly " in separation Indication message.
If the separation instruction that 4c) UE carries in detach request is CombinedGPRSandIMSIDetach, SGSN needs to send to MME to be separated Indication message, and in separation Indication message, increase cell, such as " DetachType:CombinedEPSandIMSIDetach ".
Step s505, MME send deleting bearing request message to SGW.
In this step, MME needs the type of separation of carrying in the separation Indication message judging that SGSN sends.If type of separation is IMSIDetachOnly, so MME can not send deleting bearing request message to SGW.If type of separation is EPSDetachOnly or CombinedEPSandIMSIDetach, so MME needs to send deleting bearing request to SGW.
Step s506, when SGW receives the deleting bearing request message that both sides MME and SGSN sends, so SGW sends deleting bearing request message to PGW.
Step s507, PGW return deleting bearing response message to SGW.
Step s508, SGW return deleting bearing response message to MME.
Step s509 ~ step s510, SGSN is after the detach request message receiving UE transmission, if when UE indicates DetachType to be IMSIDetachOnly in detach request message, the address of the MSC/VLR that SGSN records to it sends BSSAP+-IMSI-DETACH-INDICATION message, SGSN indicates ExplicitMSinitiatedIMSIdetachfromnon-EPSservice in above-mentioned message, if when UE indicates DetachType to be CombinedGPRSandIMSIDetach in detach request message, the address of the MSC/VLR that SGSN records to it sends BSSAP+-IMSI-DETACH-INDICATION message, SGSN indicates CombinedexplicitMSinitiatedIMSIdetachfromGPRSandnon-GPRS services in above-mentioned message.If when UE indicates DetachType to be GPRSDetachOnly in detach request message, the address of the MSC/VLR that SGSN records to it sends BSSAP+-GPRS-DETACH-INDICATION message, and SGSN indicates MSinitiatedIMSIdetachfromGPRSservice in above-mentioned message.After MSC/VLR receives this message, if Gs interface state Gs-NULL, so MSC/VLR will abandon the above-mentioned message of SGSN transmission.
After step s511, MSC/VLR receive above-mentioned message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.
Step s512 ~ step s513, according to the different situations in step s504, MME sends different separation Indication messages to MSC/VLR.
For 4a) in situation: MME is separated after Indication message receiving, when checking that DetachType is IMSIDetachOnly, the MSC/VLR recorded to it is sent SGsAP-IMSI-DETACH-INDICATION message by MME, and indicates ExplicitMSinitiatedIMSIdetachfromnon-EPSservice in this message.After MSC/VLR receives this message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.If SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message of MME transmission.
For 4b) in situation: when MME is separated after Indication message receiving, when checking that DetachType is EPSDetachOnly, MSC/VLR to record is sent SGsAP-EPS-DETACH-INDICATION message by MME, and indicates ExplicitMSinitiatedIMSIdetachfromEPSservice in this message.After MSC/VLR receives this message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.If SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-EPS-DETACH-INDICATION message of MME transmission.
For 4c) in situation: MME is separated after Indication message receiving, when checking that DetachType is CombinedEPSandIMSIDetach, MME will send SGsAP-IMSI-DETACH-INDICATION message to MSC/VLR, and indicate CombinedexplicitMSinitiatedIMSIdetachfromEPSandnon-EPSse rvices in this message.After MSC/VLR receives this message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.If SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message of MME transmission.
If step s514 SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.
Step s515, MME return to SGSN and are separated instruction acknowledge message.
Step s516, SGSN return separation to UE and accept message.
By the method provided in embodiments of the invention one and embodiment two, in user's separation scene that network side is initiated, MME and SGSN be not when knowing SGs or Gs interface state, by carrying type of separation in separation Indication message, can ensure in the separation process under CSFallback & ISR scene, ensure that user terminal can correctly be separated by MSC/VLR.
Separation method when change below to MME and SGSN perception SGs and Gs interface in processing mode two is described.
During embodiments of the invention in three, as SGs or Gs interface release, on S3 interface, notify opposite end by MME or SGSN.Or when MSC/VLR perceives SGs interface or Gs interface release, notify that MME/SGSNSGs interface or Gs interface discharge by MSC/VLR.
When notifying that SGSNGs interface is released by MME, as shown in Figure 6A, notify that the d/d flow process of SGSNGs interface comprises by MME:
Step s6A01, when Gs interface is released, such as associating Route Area and location area updating flow process in, after MME and MSC/VLR establishes SGs interface, by MME transmission Gs interface be released message informing to SGSN.
Step s6A02, after SGSN receives above-mentioned message, return Gs interface release acknowledge message.
After above-mentioned steps, the Gs interface state now recorded in SGSN becomes Gs-NULL.
When notifying that SGSNGs interface is released by MSC/VLR, as shown in Figure 6B, notify that the d/d flow process of SGSNGs interface comprises by MSC/VLR:
Step s6A03, when MSC/VLR record Gs state become Gs-NULL from Gs-ASSOCIATED time, MSC/VLR send Gs interface be released message informing SGSN.
Step s6A04, after SGSN receives above-mentioned message, return Gs interface release acknowledge message.
The Gs interface state now recorded in SGSN becomes Gs-NULL.
When notifying that MMESGs interface is released by SGSN, shown in Fig. 6 C, notify that the d/d flow process of MMESGs interface comprises by SGSN:
Step s6B01, when SGs interface is released, such as associating Route Area and location area updating flow process in, after SGSN and MSC/VLR establishes Gs interface, by SGSN transmission Gs interface be released message informing to MME.
Step s6B02, after MME receives above-mentioned message, return SGs interface release acknowledge message.
The SGs Interface status now recorded in MME becomes SGs-NULL.
When notifying that MMESGs interface is released by MSC/VLR, shown in Fig. 6 D, notify that the d/d flow process of MMESGs interface comprises by MSC/VLR:.
Step s6B03, when the SGs state of MSC/VLR record becomes SGs-NULL from SGs-ASSOCIATED, MSC/VLR sends SGs interface and is released message informing MME.
Step s6B04, after MME receives above-mentioned message, return SGs interface release acknowledge message.
The SGs Interface status now recorded in MME becomes SGs-NULL.
Shown in above-mentioned Fig. 6 A and Fig. 6 B when,
When UE occurs to be separated at E-UTRAN network, reference example one Fig. 4:
1, UE sends detach request message to MME, in detach request message, carry type of separation, can be IMSIDetachOnly, EPSDetachOnly and CombinedIMSIandEPSDetach respectively.
2, MME sends deleting bearing request message to SGW.
In this step, MME needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so MME can not send deleting bearing request message to SGW.If type of separation EPSDetachOnly or CombinedIMSIandEPSDetach, so MME needs to send deleting bearing request to SGW.
3, SGW receives in step 2 that MME is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to MME.
4, MME needs the type of separation of carrying in detach request according to UE to determine whether send separation Indication message to SGSN.
4a): when the type of separation that UE carries in detach request is IMSIDetachOnly, because MME perception SGs Interface status is SGs-ASSOCIATED, MME now can not send to SGSN and be separated Indication message, meanwhile, the step s405 shown in Fig. 4 ~ s408 and step s411 ~ s414 can not be triggered.MME is by the MSC/VLR transmission IMSI separation Indication message of the step s409 shown in Fig. 4 to record.MME in the diagram shown in step s415 return separation to UE and accept message.
4b): as the type of separation EPSDetachOnly that UE carries in detach request, MME sends to SGSN and is separated Indication message, in separation Indication message, indicate type of separation to be GPRSDetachOnly 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 can not be triggered.
4c): when the type of separation that UE carries in detach request is CombinedEPSandIMSIDetach, MME sends to SGSN and is separated Indication message, in separation Indication message, indicate type of separation to be CombinedEPSandIMSIDetach 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 can not be triggered.
When UE occurs to be separated at UTRAN/GERAN network, reference example two Fig. 5:
1, UE sends detach request message to SGSN, in detach request message, carry type of separation, can be IMSIDetachOnly, GPRSDetachOnly and CombinedGPRSandIMSIDetach respectively.
2, SGSN sends deleting bearing request message to SGW.
In this step, SGSN needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so SGSN can not send deleting bearing request message to SGW.If type of separation is GPRSDetachOnly or CombinedGPRSandIMSIDetach, so SGSN needs to send deleting bearing request to SGW.
3, SGW receives in step 2 that SGSN is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to SGSN.
4, SGSN needs the type of separation of carrying in detach request according to UE to determine whether send separation Indication message MME.
4a): when the type of separation that UE carries in detach request is IMSIDetachOnly, because SGSN perception Gs interface state is Gs-NULL, so SGSN will send to MME be separated Indication message, indication information DetachType:IMSIDetachOnly is carried in this message, MME checks that the DetachType in the separation Indication message that SGSN sends is IMSIDetachOnly, so the step s505 shown in Fig. 5 ~ s511 can not be triggered.MME checks that the DetachType in the separation Indication message that SGSN sends is IMSIDetachOnly, and SGs Interface status is SGs-ASSOCIATED, so the step s512 shown in MME meeting triggered step Fig. 5, s514, s515, s516 notify that UE is separated and returns UE and be separated and accept message by MSC/VLR.
4b): when the type of separation that UE carries in detach request is GPRSDetachOnly, SGSN sends to MME and is separated Indication message, and in separation Indication message, indicate type of separation to be EPSDetachOnly, MME perception is separated type of separation EPSDetachOnly in instruction, and SGs Interface status is SGs-ASSOCIATED, so the step s505 shown in Fig. 5 ~ s508, and s513 ~ s516 can be triggered, and due to SGSN perception Gs interface state be Gs-NULL, so the step s509 shown in Fig. 5 ~ s511 can not trigger, and be EPSDetachOnly because MME perception is separated type of separation in instruction, so the step s512 shown in Fig. 5 can not be triggered.
4c): when the type of separation that UE carries in detach request is CombinedGPRSandIMSIDetach, SGSN sends to MME and is separated Indication message, and in separation Indication message, indicate type of separation to be CombinedGPRSandIMSIDetach, MME checks that being separated type of separation in instruction is CombinedGPRSandIMSIDetach, and SGs Interface status is SGs-ASSOCIATED, so the step s505 shown in Fig. 5 ~ s508, and step s512, s514 ~ s516 can be triggered, and due to SGSN perception Gs interface state be Gs-NULL, so the step s509 shown in Fig. 5 ~ s511 can not trigger, and be CombinedGPRSandIMSIDetach because MME perception is separated type of separation in instruction, so the step s513 shown in Fig. 5 can not be triggered.
Shown in above-mentioned Fig. 6 C and Fig. 6 D when:
When UE occurs to be separated at E-UTRAN network, reference example one Fig. 4:
1, UE sends detach request message to MME, in detach request message, carry type of separation, can be IMSIDetachOnly, EPSDetachOnly and CombinedIMSIandEPSDetach respectively.
2, MME sends deleting bearing request message to SGW.
In this step, MME needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so MME can not send deleting bearing request message to SGW.If type of separation EPSDetachOnly or CombinedIMSIandEPSDetach, so MME needs to send deleting bearing request to SGW.
3, SGW receives in step 2 that MME is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to MME.
4, MME needs the type of separation of carrying in detach request according to UE to determine whether send separation Indication message to SGSN.
4a): when the type of separation that UE carries in detach request is IMSIDetachOnly, because MME perception SGs Interface status is SGs-NULL, MME now sends to SGSN and is separated Indication message, SGSN checks that the type of separation be separated in Indication message is IMSIDetachOnly, so the step s405 shown in Fig. 4 ~ s410 can not be triggered.SGSN checks the type of separation IMSIDetachOnly be separated in Indication message, and Gs interface state is the step s411 shown in Gs-ASSOCIATED, SGSN triggering graph 4, s413, s414, s415 send IMSI separation Indication message to the MSC/VLR recorded and return separation to UE and accept message.Because SGSN checks that the type of separation be separated in Indication message is IMSIDetachOnly, so the step s412 shown in Fig. 4 can not be triggered.
4b): as the type of separation EPSDetachOnly that UE carries in detach request, MME sends to SGSN and is separated Indication message, in separation Indication message, indicate type of separation to be GPRSDetachOnly simultaneously, because SGSN perception Gs interface state is Gs-ASSOCIATED, and the type of separation be separated in instruction is GPRSDetachOnly, 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 the step s409 shown in Fig. 4 and s410 can not be triggered.Because SGSN checks the type of separation EPSDetachOnly be separated in Indication message, so the step s411 shown in Fig. 4 can not be triggered.
4c): when the type of separation that UE carries in detach request is CombinedEPSandIMSIDetach, MME sends to SGSN and is separated Indication message, in separation Indication message, indicate type of separation to be CombinedEPSandIMSIDetach simultaneously, because SGSN perception Gs interface state is Gs-ASSOCIATED, and the type of separation be separated in instruction is CombinedEPSandIMSIDetach, step s405 shown in Fig. 4 ~ s408, s411, s413 ~ s415 can be triggered, because MME perception SGs Interface status is SGs-NULL, so the step s409 shown in Fig. 4 and s410 can not be triggered.Because SGSN checks that the type of separation be separated in Indication message is CombinedEPSandIMSIDetach, so the step s412 shown in Fig. 4 can not be triggered.
When UE occurs to be separated at UTRAN/GERAN network, reference example two Fig. 5:
1, UE sends detach request message to SGSN, in detach request message, carry type of separation, can be IMSIDetachOnly, GPRSDetachOnly and CombinedGPRSandIMSIDetach respectively.
2, SGSN sends deleting bearing request message to SGW.
In this step, SGSN needs the type of separation judging that UE carries in detach request message.If type of separation is IMSIDetachOnly, so SGSN can not send deleting bearing request message to SGW.If type of separation is GPRSDetachOnly or CombinedGPRSandIMSIDetach, so SGSN needs to send deleting bearing request to SGW.
3, SGW receives in step 2 that SGSN is after its deleting bearing request message sent, and deleting bearing also returns deleting bearing response message to SGSN.
4, SGSN needs the type of separation of carrying in detach request according to UE to determine whether send separation Indication message MME.
4a): when the type of separation that UE carries in detach request is IMSIDetachOnly, because SGSN perception Gs interface state is Gs-ASSOCIATED, so SGSN does not send to MME be separated Indication message, so the step s505 shown in Fig. 5 ~ s508 and s512 ~ s515 can not be triggered.When SGSN checks that the separation instruction that UE carries in detach request message is IMSIDetachOnly, step s509 shown in triggering graph 5, s511, s516 send IMSI to the MSC/VLR of record and are separated Indication message, and UE is separated and returns to UE and be separated and accept message by notice MSC/VLR.And the step s510 shown in Fig. 5 can not be triggered.
4b): when the type of separation that UE carries in detach request is GPRSDetachOnly, SGSN sends to MME and is separated Indication message, and in separation Indication message, indicate type of separation to be EPSDetachOnly, 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 due to MME perception SGs Interface status be SGs-NULL, so the step s512 shown in Fig. 5 ~ s514 can not trigger, and be EPSDetachOnly because SGSN perception is separated type of separation in instruction, so the step s509 shown in Fig. 5 can not be triggered.
4c): when the type of separation that UE carries in detach request is CombinedGPRSandIMSIDetach, SGSN sends to MME and is separated Indication message, and in separation Indication message, indicate type of separation to be CombinedGPRSandIMSIDetach, SGSN checks that Gs interface state is Gs-ASSOCIATED, so the step s505 shown in Fig. 5 ~ s509, s511, s515 and s516 can be triggered, and due to MME perception SGs Interface status be SGs-NULL, so the step s512 shown in Fig. 5 ~ s514 can not trigger, because in SGSN perception separation instruction, type of separation is CombinedGPRSandIMSIDetach, so the step s510 shown in Fig. 5 can not be triggered.
By the method provided in 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 be notified accordingly, according to the state of interface, MME or SGSN judges whether to send and is separated Indication message, and carries type of separation in the separation Indication message sent, can ensure in the sub-argument flow process under CSFallback & ISR scene, ensure that user terminal can correctly be separated by MSC/VLR.
For the scene of user's separation that network side is initiated, mainly SGSN, MME and HSS (HomeSubscriberServer, home subscriber server) initiate.UE is just separated in packet domain, so there is not circuit domain similar in the separation scene initiated with UE to be separated the scene with circuit domain packet domain combined separation by user's separation scene that network side is initiated.
In embodiments of the invention four, the scene that UE is separated in packet domain by MME as shown in Figure 7, comprising:
Step s701, when MME start to perform UE be separated time, MME sends Detachindication message to SGSN, in this message, increase cell " DetachType:GPRSDetachOnly ", or another one indication information element instruction SGSN sends BSSAP+-GPRS-DETACH-INDICATION message to MSC.
Step s702, when SGSN receive MME send Detachindication message time, send BSSAP+-GPRS-DETACH-INDICATION message according to cell DetachType:GPRSDetach wherein or indication information element to MSC/VLR, and indicate ExplicitMSinitiatedIMSIdetachfromGPRSservice in this message.After MSC/VLR receives this message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.If Gs interface state is Gs-NULL, so MSC/VLR will abandon the BSSAP+-GPRS-DETACH-INDICATION message of SGSN transmission.
The address of the MSC/VLR that step s703, MME record to it sends SGsAP-IMSI-DETACH-INDICATION message, and MME indicates CombinedexplicitMSinitiatedIMSIdetachfromEPSandnon-EPSse rvices in above-mentioned message.After MSC/VLR receives this message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.If SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-IMSI-DETACH-INDICATION message of MME transmission.
Step s704, SGSN return DetachindicationAck message to MME.
Also can according to the method for embodiment three in this flow process, the state of MME and the SGSN notified SGs interface of difference and Gs interface.Namely 1) when the notified SGs Interface status of MME is SGs-NULL, MME can not triggered step s703.2) when the notified Gs interface condition conversion of SGSN is Gs-NULL, SGSN can not triggered step s702.
In embodiments of the invention four, the scene that UE is separated in packet domain by SGSN as shown in Figure 8, comprising:
Step s801, when SGSN start to perform UE be separated time, SGSN sends Detachindication message to MME, in this message, increase cell " DetachType:EPSDetachOnly ", or another one indication information element instruction MME sends SGsAP+-EPS-DETACH-INDICATION message to MSC.
Step s802, to be separated after Indication message receiving as MME, according to cell DetachType:EPSDetach wherein or indication information element, MSC/VLR to record is sent SGsAP-EPS-DETACH-INDICATION message by MME, and indicates ExplicitMSinitiatedIMSIdetachfromEPSservice in this message.After MSC/VLR receives this message, if SGs Interface status is SGs-ASSOCIATED, so SGs interface is set to SGs-NULL state.If SGs Interface status is SGs-NULL, so MSC/VLR will abandon the SGsAP-EPS-DETACH-INDICATION message of MME transmission.
The address of the MSC/VLR that step s803, SGSN record to it sends BSSAP+-GPRS-DETACH-INDICATION message, and SGSN indicates MSinitiatedIMSIdetachfromGPRSservice in above-mentioned message.After MSC/VLR receives this message, if Gs interface state is Gs-ASSOCIATED, so Gs interface is set to Gs-NULL state.If Gs interface state Gs-NULL, so MSC/VLR will abandon the above-mentioned message of SGSN transmission.
Step s804, MME return DetachindicationAck message to SGSN.
Also can according to the method for embodiment three in this flow process, the state of MME and the SGSN notified SGs interface of difference and Gs interface.Namely 1) when the notified Gs interface state of SGSN is Gs-NULL, SGSN can not triggered step s803.2) when the notified SGs Interface status of MME is converted into SGs-NULL, MME can not triggered step s802.
By the method provided in embodiments of the invention four, in user's separation scene that network side is initiated, by carrying type of separation in separation Indication message, can ensure in the sub-argument flow process under CSFallback & ISR scene, ensure that user terminal can correctly be separated by MSC/VLR.
Embodiments of the invention also provide a kind of circuit domain CS business to return the piece-rate system of legacy network, comprising:
First Mobility Management Entity, for generating the separation Indication message carrying type of separation; And described separation Indication message is sent to the second Mobility Management Entity;
Second Mobility Management Entity, for being separated user terminal according to the type of separation of carrying in described separation Indication message.
Also comprise:
User terminal, for sending the detach request of carrying type of separation to described first Mobility Management Entity.
The signaling plane controlled entity of circuit domain, the signaling plane controlled entity of described circuit domain and/or the second Mobility Management Entity, also for sending SGs interface release message or Gs interface release message to described first Mobility Management Entity.
Described second Mobility Management Entity, also whether be released for the separation Indication message that sends according to described first Mobility Management Entity and SGs interface or Gs interface, judge whether that the signaling plane controlled entity to circuit domain sends corresponding separation Indication message.
Described first Mobility Management Entity, also for the type of separation in the detach request that sends according to user terminal, and whether SGs interface or Gs interface are released, judge whether to send to described second Mobility Management Entity to carry the separation Indication message of type of separation, or whether send corresponding separation Indication message to the signaling plane controlled entity of circuit domain.
Concrete, described first Mobility Management Entity is MME, described second Mobility Management Entity is SGSN; Or described first Mobility Management Entity be SGSN, described second Mobility Management Entity is MME.
Embodiments of the invention also provide a kind of first Mobility Management Entity, return the separation of legacy network for user terminal in circuit domain CS business, as shown in Figure 9, comprising:
Be separated instruction message generation unit 11, for generating the separation Indication message carrying type of separation; Be separated instruction message generation unit 11 specifically to may be used for: according to the type of separation in the detach request that user terminal sends, generate the separation Indication message carrying type of separation; Or initiatively generate the separation Indication message carrying type of separation.
Be separated instruction message sending unit 12, for described separation Indication message is sent to the second Mobility Management Entity, according to the type of separation of carrying in described separation Indication message, user terminal be separated to indicate the second Mobility Management Entity.
Also comprise:
Deleting bearing request transmitting unit 13, for when the type of separation in the detach request that described user terminal sends be packet domain be separated or circuit domain packet domain combined separation time, send deleting bearing request message to service gateway device, and receive the deleting bearing response of described service gateway device transmission.
Interface release message receiving element 14, the SGs interface release message that the signaling plane controlled entity for receiving the second Mobility Management Entity or circuit domain sends or Gs interface release message, determine whether SGs interface or Gs interface are released.
Above-mentioned separation instruction message generation unit 11 specifically can also be used for: according to the type of separation in the detach request that user terminal sends, and whether SGs interface or Gs interface are released, judge whether to generate the separation Indication message carrying type of separation sent to the second Mobility Management Entity, or whether generate the separation Indication message of the correspondence that the signaling plane controlled entity to circuit domain sends.
Embodiments of the invention also provide a kind of second Mobility Management Entity, return the separation of legacy network for user terminal in circuit domain CS business, as shown in Figure 10, comprising:
Be separated instruction message reception units 21, for receiving the separation Indication message that the first Mobility Management Entity sends;
Be separated instruction message sending unit 22, for according to the type of separation in described separation Indication message, to the separation Indication message that the signaling plane controlled entity transmission in CS territory is corresponding.
Also comprise:
Interface release message transmitting element 23, for sending SGs interface release message or Gs interface release message to described first Mobility Management Entity, and determines whether SGs interface or Gs interface are released.
Concrete, described separation instruction message sending unit 21 specifically may be used for: according to the type of separation in described separation Indication message, and whether SGs interface or Gs interface are released, judge whether that the signaling plane controlled entity to CS territory sends corresponding separation Indication message.
The system that the embodiment of the application of the invention provides and equipment, the separation Indication message that first Mobility Management Entity is sending to the second Mobility Management Entity carries type of separation, make the second Mobility Management Entity carry out separating treatment according to the type of separation of carrying in described separation Indication message to user terminal, can ensure correctly user terminal to be separated in the separation process under CSFallback & ISR scene.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (6)
1. circuit domain CS business returns a separation method for legacy network, it is characterized in that, comprising:
If the saving signaling ISR under idle pulley is activated, first Mobility Management Entity sends first to the second Mobility Management Entity and is separated Indication message, described first is separated Indication message comprises type of separation, described first separation Indication message is used to indicate according to the second separation Indication message of described type of separation to the signaling plane controlled entity transmission correspondence of circuit domain, and described second separation Indication message is used to indicate interface corresponding between described second Mobility Management Entity of removal and the signaling plane controlled entity of described circuit domain and connects;
Described first Mobility Management Entity is according to the signaling plane controlled entity transmission three separation Indication message of described type of separation to described circuit domain, and described 3rd separation Indication message is used to indicate interface corresponding between described first Mobility Management Entity of removal and the signaling plane controlled entity of described circuit domain and connects;
Wherein, described first Mobility Management Entity is SGSN, described second Mobility Management Entity is MME, described second separation Indication message is used to indicate the SGs removed between described MME and the signaling plane controlled entity of described circuit domain and is connected, and described 3rd separation Indication message is used to indicate the Gs removed between described SGSN and the signaling plane controlled entity of described circuit domain and is connected.
2. the method for claim 1, is characterized in that, also comprises:
Described first Mobility Management Entity receives the detach request message that subscriber equipment sends, and described detach request message comprises described type of separation.
3. circuit domain CS business returns a separation method for legacy network, it is characterized in that, comprising:
Second Mobility Management Entity receives the first separation Indication message that the first Mobility Management Entity sends, and described first is separated Indication message comprises type of separation; Wherein, after described first separation Indication message is sent out, 3rd is separated indication information is sent to circuit domain signaling plane controlled entity by described first Mobility Management Entity, and described 3rd separation indication information is used to indicate the interface removed between described first Mobility Management Entity and the signaling plane controlled entity of described circuit domain and is connected;
Described second Mobility Management Entity is according to the signaling plane controlled entity transmission second separation Indication message of described type of separation to described circuit domain, and described second separation Indication message is used to indicate interface corresponding between described second Mobility Management Entity of removal and the signaling plane controlled entity of described circuit domain and connects;
Wherein,
Described first Mobility Management Entity is SGSN, described second Mobility Management Entity is MME, described second separation Indication message is used to indicate the SGs removed between described MME and the signaling plane controlled entity of described circuit domain and is connected, and described 3rd separation indication information is used to indicate the Gs removed between described SGSN and the signaling plane controlled entity of described circuit domain and is connected.
4. a Mobility Management Entity, is characterized in that, comprising:
First transmitting element, if be activated for the saving signaling ISR under idle pulley, send first to the second Mobility Management Entity and be separated Indication message, described first is separated Indication message comprises type of separation, described first separation Indication message is used to indicate according to the second separation Indication message of described type of separation to the signaling plane controlled entity transmission correspondence of circuit domain, and described second separation Indication message is used to indicate interface corresponding between described second Mobility Management Entity of removal and the signaling plane controlled entity of described circuit domain and connects;
Second transmitting element, be separated Indication message for sending the 3rd to the signaling plane controlled entity of described circuit domain, described 3rd separation Indication message is used to indicate interface corresponding between the described Mobility Management Entity of removal and the signaling plane controlled entity of described circuit domain and connects;
Wherein, described Mobility Management Entity is SGSN, described second Mobility Management Entity is MME, described second separation Indication message is used to indicate the SGs removed between described MME and the signaling plane controlled entity of described circuit domain and is connected, and described 3rd separation Indication message is used to indicate the Gs removed between described SGSN and the signaling plane controlled entity of described circuit domain and is connected.
5. Mobility Management Entity as claimed in claim 4, is characterized in that, also comprise:
Receiving element, for receiving the detach request message that subscriber equipment sends, described detach request message comprises described type of separation.
6. a Mobility Management Entity, is characterized in that, comprising:
Receiving element, send for receiving the first Mobility Management Entity first is separated Indication message, and described first is separated Indication message comprises type of separation; Wherein, after described first separation Indication message is sent out, 3rd is separated indication information is sent to circuit domain signaling plane controlled entity by described first Mobility Management Entity, and described 3rd separation indication information is used to indicate the interface removed between described first Mobility Management Entity and the signaling plane controlled entity of described circuit domain and is connected;
Transmitting element, be separated Indication message for sending second according to described type of separation to the signaling plane controlled entity of described circuit domain, described second is separated Indication message is used to indicate and removes interface corresponding between described Mobility Management Entity and the signaling plane controlled entity of described circuit domain and connect;
Wherein,
Described Mobility Management Entity is MME, described first Mobility Management Entity is SGSN, described second separation Indication message is used to indicate the SGs removed between described MME and the signaling plane controlled entity of described circuit domain and is connected, and described 3rd separation indication information is used to indicate the Gs removed between described SGSN and the signaling plane controlled entity of described circuit domain and is connected.
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| CN101202956A (en) * | 2005-01-24 | 2008-06-18 | 华为技术有限公司 | Method for implementation of IP multimedia subsystem conversation falling back to circuit switching call |
| CN101222765A (en) * | 2008-01-24 | 2008-07-16 | 中兴通讯股份有限公司 | Control method, system and device for circuit field fall-back |
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