CN102547653B - Reduce the method and system that terminal falls back to Circuit Switching Network's number - Google Patents
Reduce the method and system that terminal falls back to Circuit Switching Network's number Download PDFInfo
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- CN102547653B CN102547653B CN201110458244.0A CN201110458244A CN102547653B CN 102547653 B CN102547653 B CN 102547653B CN 201110458244 A CN201110458244 A CN 201110458244A CN 102547653 B CN102547653 B CN 102547653B
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Abstract
The invention provides a kind of method and system for reducing terminal and falling back to Circuit Switching Network's number, wherein, methods described includes：When the MSC/VLR in Circuit Switching Network is by terminal in mobility management entity paging system framework evolvement network, judge paging to whether also needing to be communicated with the terminal after terminal；If MSC/VLR judges to also need to be communicated with the terminal after paging to terminal, then after page response of the terminal by falling back to Circuit Switching Network's return is received, maintenance and the connection of terminal, and then avoid the multiple falling operation of terminal execution during the terminal of legacy circuit-switched networks paging SAE nets.
Description
Technical field
The present invention relates to circuit switching fall-back technology, more particularly to reduce the method that terminal falls back to Circuit Switching Network's number
And system.
Background technology
System architecture evolution SAE networks are third generation partner program (3rd Generation Partnership
Project, 3GPP) organize to set up substituting the new generation of wireless network technology of legacy circuit-switched networks network.SAE networks replace
It is the trend of a certainty for legacy circuit-switched networks network, but within a long-term time, SAE networks also need and traditional electricity
Road exchange network coexists.SAE networks and legacy circuit-switched networks network coexistence framework figure as shown in Figure 1.
Wherein, SAE networks include mobility management entity (Mobility Management Entity, MME), evolution without
Line node (evolved NodeB, eNodeB), SAE gateways (System Architecture Evolution Gateway,
SAE GW) and home subscriber server HSS.
ENodeB, provided on eating dishes without rice or wine than global system for mobile communications wireless access network (Universal Mobile
Telecommunication System Radio Access Network, UTRAN) higher up-downgoing speed, lower biography
Defeated delay is wirelessly transferred with relatively reliable；And Radio Resource is provided for the access of terminal, while pass through S1-C between MME
Interface establishes connection, is established and connected by S1-U interface with SAE gateways.
MME, control face entity, the server of interim storage terminal data (such as terminal contexts)；It is interim for terminal distribution
Identify global unique temporary identity (Globally Unique Temporary Identity, GUTI)；It is responsible for from eNodeB
The terminal of access is authenticated.
SAE gateways, user entity, it is responsible for user face data route processing.SAE GW are generally divided into gateway
Serving GW and packet data network gateway PDN GW；Wherein, Serving GW are responsible for SAE Long Term Evolutions and eated dishes without rice or wine LTE and general
Ambulant anchor point between GSM UMTS, MME and serving GPRS support node are triggered by downlink data under idle condition
SGSN is paged；PDN GW are responsible for playing terminal accessing group data network PDN (Packet Data Network) gateway function,
For terminal distribution IP (Internet Protoco1) address.Serving GW and PDN GW, which can be closed, is located at a physical equipment
In.
HSS, for preserving the subscription data of terminal, while record the MME titles (MME NAME) where terminal.
Traditional circuit-switched network includes mobile switching centre (Mobile Switching Center, MSC), visit
Location register (Visitor Location Register, VLR), 3G Radio Access Controller (Radio Network
Controller, RNC) or 2G base station controllers (Base Station Controller, BSC), attaching position register
(Home Location Register, HLR), gateway MSC (Gateway Mobile Switching
Center, GMSC) and Service control plane (Service Control Plan, SCP).
MSC, it is the switching centre of GSM network, there is provided function of exchange and the connection with other functions in system, wherein with
RNC or BSC is connected by Iu interfaces；VLR is then a customer data base, the user profile in compass of competency for storing, bag
Include but be not limited to user's signing service, additional service information and user activity information；Usual MSC and VLR, which is closed, to be put；
RNC and BSC, for controlling the wireless activity with management terminal.
HLR, for preserving the signing information and VLR address of terminal.In calling is called, HLR can be obtained from VLR and exhaled
The animated walk-through number (Mobile Subscriber Roaming Number, MSRN) of terminal.HLR and HSS can be closed and is located at
In one physical equipment.
GMSC, for routing the call to the MSC where terminal called.When calling mobile terminal, GMSC is obtained by HLR
The MSRN of terminal called, route calling is carried out according to MSRN.
SCP, for controlling the service logic of terminal, especially call logic.When terminal is initiated or receives calling,
SCP can obtain the position of terminal, and computational costs by HLR from VLR, to determine whether the calling can continue, and calling
Sustainable duration.
There is a terminal (UE) that be able to can be communicated with SAE networks and traditional circuit-switched network in Fig. 1.By
Limitation and energy saving requirement in UE abilities, it can only be resided in a wireless system in same moment UE, such as when UE is resident
In SAE networks, beep-page message directly can not be received from traditional circuit-switched network.
Because legacy circuit-switched networks network wireless coverage is preferable, service is relatively stable, so it is effective benefit of SAE networks
Fill.When SAE can not provide satisfied traditional voice service, can transfer to provide relevant service by legacy circuit-switched networks network.
This mechanism for returning back to legacy circuit-switched networks network be called circuit switching fall-back (Circuit Switch Fallback,
CSFB) technology.CSFB technologies build SGs interfaces between SAE MME and the MSC/VLR of legacy circuit-switched networks network.By this
SGs interfaces, the terminal resided in SAE that MME can allow triggers the position update flow of legacy circuit-switched networks network, to complete UE
Registered while SAE activities in legacy circuit-switched networks network, specific register flow path is as shown in Figure 2.
After S201 works as the terminal UE start in SAE or changes tracking area (Tracking Area, TA), UE initiates to open
Machine (ATTACH) or tracing section updating (Tracking Area Update, TAU) message；
S202MME receives the registration that HSS is arrived after above-mentioned message；
After S203 succeeds in registration, MME reported by UE its own where tracking area derive UE traditional circuit hand over
Position area (LAI, Location Area Identity) in switching network, and navigate to MSC/VLR corresponding with the position area；
S204MME sends position updating request to the MSC/VLR by SGs interfaces；
After S205MSC/VLR receives position updating request, detect itself and whether store the data of the UE, or deposited
Whether the UE data of storage are accurate；If detect itself not storing the data of the UE, or stored UE data are forbidden
When true, MSC/VLR sends position updating request to HLR；If detect itself to store the data of the UE, and it is stored
When UE data are accurate, step S209 is performed；
S206HLR sends insertion user data requests to MSC/VLR,；
S207MSC/VLR updates UE positional informations, and returns to insertion user data response to HLR；
S208HLR is updated successfully response to MSC/VLR home positions, MSC/VLR number where record UE；
S209MSC/VLR returns to SGs interface positions to MME and is updated successfully response, and is sharp by the status modifier of SGs interfaces
It is living.
UE in SAE is after legacy circuit-switched networks network is registered, it becomes possible to is received in a manner of CSFB from tradition
The called call request of circuit-switched network.The flow that the UE in SAE is called by legacy circuit-switched networks network is as shown in Figure 3.
Assume that contracted ends of legacy circuit-switched networks network of UE exhale IN service in the flow.
S301 GMSC receive the initial address message (Initial Address Message, IAM) to the UE, according to this
The UE mobile user comprehensive service digital net numbers MSISDN (i.e. UE telephone numbers) that IAM is carried finds UE HLR；
S302GMSC is sent to HLR obtains routing iinformation (Send Routing Information, SRI) request, should ask
Seek middle carrying UE Mobile Subscriber International ISDN Number；
Because the UE is to exhale IN service contracted user eventually, HLR needs to return to GMSC first exhales IN service to contract eventually
Information (Terminating CAMEL Subscription Information, T-CSI)；
S303HLR returns to T-CSI to GMSC；
S304GMSC exhales IN service eventually according to T-CSI triggerings, sends initialization monitoring point (Initial Detection
Point, IDP) message is to SCP；
S305 is because SCP needs to obtain UE positional information in business processing, therefore SCP sends and inquires about (Any at any time
Time Interrogation, ATI) message is to HLR；
S306HLR finds UE MSC/VLR numbers according to UE Mobile Subscriber International ISDN Number, and is sent to the MSC/VLR and provide use
Family information (Provide Subscriber Info, PSI) is asked, and request MSC/VLR provides UE in legacy circuit-switched networks network
Positional information；
S307 is because UE now resides in SAE networks, therefore MSC/VLR sends paging Paging message by SGs interfaces
To MME；
S308MME pages UE, and notifies UE to fall back to legacy circuit-switched networks network in beep-page message；
After S309UE receives beep-page message, legacy circuit-switched networks network is fallen back to；
S310UE returns to page response by legacy circuit-switched networks network to MSC/VLR；
S311MSC/VLR obtains UE positional information from page response, and the positional information is sent extremely by PSI responses
HLR；Because this PSI treatment progress terminates, MSC/VLR discharges the connection with UE simultaneously；
S312UE returns to SAE networks；
UE positional informations are carried and return to SCP in ATI responses by S313HLR；
S314SCP confirms that calling can continue, and sends calling continuation message to GMSC；
S315GMSC sends SRI requests and arrives HLR again, suppresses T-CSI marks wherein carrying；
S316HLR sends (Provide Roaming Number, the PRN) request that Provides Roaming Number and arrives MSC/VLR；
S317MSC/VLR distributes interim subscriber identity MSRN to HLR, the MSRN unique marks MSC/VLR and UE；
S318HLR returns to SRI and responds to GMSC, carries MSRN；
S319GMSC routes the call to MSC/VLR according to MSRN；
S320 is because UE has returned to LTE, so MSC/VLR sends Paging message to MME again by SGs interfaces；
S321MME pages UE processes, notifies UE to fall back to legacy circuit-switched networks network in beep-page message；
After S322UE receives beep-page message, legacy circuit-switched networks network is fallen back to again；
S323UE returns to page response by legacy circuit-switched networks network to MSC/VLR；
Setup requests Setup is sent to UE by S324MSC/VLR
S325MSC/VLR completes remaining be called with UE and establishes process.
Said process, the SCP in circuit-switched network send PSI message triggers MSC/VLR by HLR to MSC/VLR
Beep-page message is sent by terminal of the SGs interfaces into SAE networks and promotes the terminal to fall back to circuit-switched network.But
After MSC/VLR gets the positional information of terminal, MSC/VLR releases and UE connection.The follow-up calling sent as GMSC is arrived
Up to MSC/VLR, because UE has returned to LTE, MSC/VLR need to also send again by terminal of the SGs interfaces into SAE networks and seek
Exhale message and promote the terminal to fall back to circuit-switched network.There are the paging of SGs mouths twice and UE to fall behaviour after rise in whole processing
Make, process redundancy, efficiency is low.
The content of the invention
The invention provides a kind of method and MSC/VLR for reducing terminal and falling back to Circuit Switching Network's number, to solve such as
Terminal performs the technical problem for repeatedly falling operation after rise during the terminal what avoids netting from legacy circuit-switched networks paging SAE.
In order to solve the above technical problems, the invention provides a kind of side for reducing terminal and falling back to Circuit Switching Network's number
Method, it the described method comprises the following steps：
When the mobile switching centre (MSC) in Circuit Switching Network/VLR Visitor Location Register (VLR) is real by mobile management
During terminal in body (MME) evolution of paging system framework (SAE) network, judge paging to whether also needing to and the terminal after terminal
Communicated；
If the MSC/VLR judges to also need to be communicated with the terminal after paging to terminal, described receiving
After the page response that terminal returns by falling back to Circuit Switching Network, the connection with the terminal is maintained.
Further, the MSC/VLR judges that paging includes to whether also needing to after terminal to carry out communication with the terminal：
The MSC/VLR detects its triggering received and paged self by MME in the message of the terminal in SAE networks
It is no to be paged comprising instruction MSC/VLR to the mark for also needing to after terminal be communicated with the terminal, if comprising the mark,
MSC/VLR is maintained and the terminal after page response of the terminal by falling back to Circuit Switching Network's return is received
Connection.
Further, message the returning for Circuit Switching Network that MSC/VLR pages the terminal in SAE networks by MME is triggered
Offer user profile (PSI) request message that location register (HLR) is sent is provided.
In order to solve the above technical problems, the invention provides it is a kind of reduce terminal fall back to Circuit Switching Network's number to be
System, the system include mobile switching centre (MSC)/VLR Visitor Location Register (VLR), the MSC/VLR include paging module,
Judge module, wherein,
The paging module, pass through mobility management entity for receiving the triggering MSC/VLR from external equipment
(MME) signal of the terminal in the evolution of paging system framework (SAE) network, and after the trigger signal is received, to judging mould
Block sends the inquiry request for whether maintaining connection；And after the connection instruction of the maintenance from the judge module is received, to
The terminal sends paging signal, and receive the terminal by fall back to Circuit Switching Network return page response after, dimension
Hold the connection with the terminal；
The judge module, after receiving the inquiry request from the paging module, judge that MSC/VLR is being paged
Whether also need to be communicated with the terminal after to terminal；And judge MSC/VLR page to also need to after terminal with should
When terminal is communicated, sent to the paging module and maintain connection instruction.
Further, the MSC/VLR includes,
The judge module, the triggering for being received by detecting the MSC/VLR page SAE nets self by MME
Whether mark that instruction MSC/VLR page to terminal after also need to the terminal communicated is included in the message of terminal in network
Know to judge whether MSC/VLR also needs to be communicated with the terminal after paging to terminal.
Further, the MSC/VLR includes,
The paging module, the offer user that the attaching position register (HLR) for receiving Circuit Switching Network is sent
After information (PSI) request message, the inquiry request for whether maintaining connection is sent to judge module.
If MSC/VLR judges that paging also needs to carry out with the terminal into SAE networks after terminal in above-mentioned technical proposal
Communication, after page response of the terminal by falling back to Circuit Switching Network's return is received, the connection with the terminal is continued to,
Just disconnect and be somebody's turn to do after receiving page response of the terminal by falling back to Circuit Switching Network's return relative to prior art MSC/VLR
For the connection of terminal, terminals of the follow-up MSC/VLR again into SAE networks can be avoided to send beep-page message and promote the end
Circuit-switched network is fallen back at end again, is simplified Message Processing flow, has been saved Internet resources.
Brief description of the drawings
Fig. 1 is prior art SAE networks and legacy circuit-switched networks network coexistence framework figure；
Fig. 2 is the signal flow graph that prior art UE is registered while SAE activities in legacy circuit-switched networks network；
Fig. 3 is the signal flow graph that prior art calls the UE in SAE by legacy circuit-switched networks network；
Fig. 4 is that the reduction terminal of the present embodiment falls back to the method flow diagram of Circuit Switching Network's number；
Fig. 5 is the signal flow graph that the legacy circuit-switched networks network of this application example calls the UE in SAE；
Fig. 6 is the internal module figure that the reduction terminal of the present embodiment falls back to the MSC/VLR of Circuit Switching Network's number.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case where not conflicting, in the embodiment and embodiment in the application
Feature can mutually be combined.
Fig. 4 is that the reduction terminal of the present embodiment falls back to the method flow diagram of Circuit Switching Network's number.
S401MSC/VLR receives the message that the terminal in SAE networks is paged in triggering by MME；
S402MSC/VLR judges whether also need to be communicated with the terminal after paging to terminal, if it is desired, performs step
Rapid S403；Otherwise, step S404 is performed；
The MSC/VLR can be by detecting its triggering disappearing self by the terminal in MME paging SAE networks received
Whether mark that instruction MSC/VLR page to terminal after also need to the terminal communicated is included in breath, to judge to page
Whether also need to be communicated with the terminal after to terminal；
It can be the ownership position from Circuit Switching Network that MSC/VLR, which is triggered, by the MME message for paging the terminal in SAE networks
Offer user profile (PSI) request of register (HLR) is provided；Above-mentioned mark can by HLR be added to PSI after, by the PSI send to
MSC/VLR；
S403MSC/VLR pages the terminal in SAE networks by MME, and is handed over receiving terminal by falling back to circuit
After the page response that draping returns, the connection with the terminal is maintained；
S404 flows terminate.
Reduction by taking the signal flow that legacy circuit-switched networks network calls the UE in SAE as an example to above-mentioned the present embodiment below
The method flow that terminal falls back to Circuit Switching Network's number is described further.
Fig. 5 is the signal flow graph that the legacy circuit-switched networks network of this application example calls the UE in SAE.It is false in the flow
Determine contracted ends of legacy circuit-switched networks network of UE and exhale IN service.
S501GMSC receives the initial address message (Initial Address Message, IAM) to the UE, according to this
The UE mobile user comprehensive service digital net numbers MSISDN (i.e. UE telephone numbers) that IAM is carried finds UE HLR；
S502GMSC is sent to HLR obtains routing iinformation (Send Routing Information, SRI) request, should ask
Seek middle carrying UE Mobile Subscriber International ISDN Number；
S503HLR returns to T-CSI to GMSC；
S504GMSC exhales IN service eventually according to T-CSI triggerings, sends initialization monitoring point (Initial Detection
Point, IDP) message is to SCP；
S505 is because SCP needs to obtain UE positional information in business processing, therefore SCP sends and inquires about (Any at any time
Time Interrogation, ATI) message is to HLR；
S506HLR finds UE MSC/VLR numbers according to UE Mobile Subscriber International ISDN Number, and is sent to the MSC/VLR and provide use
Family information (Provide Subscriber Info, PSI) is asked, and request MSC/VLR provides UE in legacy circuit-switched networks network
Positional information；Meanwhile HLR addition instruction MSC/VLR in PSI requests also need to what is communicated with the UE after paging to UE
Mark；
S507 because UE now resides in SAE networks, therefore MSC/VLR by SGs interfaces send Paging message to
MME；
S508MME pages UE, and notifies UE to fall back to legacy circuit-switched networks network in beep-page message；
After S509UE receives beep-page message, legacy circuit-switched networks network is fallen back to；
S510UE returns to page response by legacy circuit-switched networks network to MSC/VLR；
S511MSC/VLR obtains UE positional information from page response, and the positional information is sent extremely by PSI responses
HLR；MSC/VLR keeps the currently connection with UE；
UE positional informations are carried and return to SCP in ATI responses by S512HLR；
S513SCP confirms that calling can continue, and sends calling continuation message to GMSC；
S514GMSC sends SRI requests and arrives HLR again, suppresses T-CSI marks wherein carrying；
S515HLR sends (Provide Roaming Number, the PRN) request that Provides Roaming Number and arrives MSC/VLR；
S516MSC/VLR distributes interim subscriber identity MSRN to HLR, the MSRN unique marks MSC/VLR and UE；
S517HLR returns to SRI and responds to GMSC, carries MSRN；
S518GMSC routes the call to MSC/VLR according to MSRN；
S519 is because MSC/VLR keeps the currently connection with UE, so MSC/VLR can be directly by setup requests
Setup is sent to UE；
S520MSC/VLR completes remaining be called with UE and establishes process.
Fig. 6 is the internal module figure that the reduction terminal of the present embodiment falls back to the MSC/VLR of Circuit Switching Network's number.
The MSC/VLR includes paging module, judge module, wherein,
Module is paged, passes through mobility management entity (MME) for receiving the triggering MSC/VLR from external equipment
The signal of terminal in the evolution of paging system framework (SAE) network, and after the trigger signal is received, sent to judge module
Whether maintenance connection inquiry request；And after the connection instruction of the maintenance from the judge module is received, to the end
End send paging signal, and receive the terminal by fall back to Circuit Switching Network return page response after, maintain and institute
State the connection of terminal；
The paging module, the offer user sent available for the attaching position register (HLR) for receiving Circuit Switching Network
After information (PSI) request message, the inquiry request for whether maintaining connection is sent to judge module.
Judge module, after receiving the inquiry request from the paging module, judge MSC/VLR in paging to eventually
Whether also need to be communicated with the terminal behind end；And judging that MSC/VLR paged to also needing to and the terminal after terminal
When being communicated, sent to the paging module and maintain connection instruction.
The judge module, SAE nets are paged self by MME available for the triggering received by detecting the MSC/VLR
Whether mark that instruction MSC/VLR page to terminal after also need to the terminal communicated is included in the message of terminal in network
Know to judge whether MSC/VLR also needs to be communicated with the terminal after paging to terminal.
One of ordinary skill in the art will appreciate that all or part of step in the above method can be instructed by program
Related hardware is completed, and described program can be stored in computer-readable recording medium, such as read-only storage, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits, accordingly
Ground, each module/unit in above-described embodiment can be realized in the form of hardware, can also use the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
It should be noted that the present invention can also have other various embodiments, without departing substantially from of the invention spiritual and its essence
In the case of, those skilled in the art can make various corresponding changes and deformation according to the present invention, but these are corresponding
Change and deform the protection domain that should all belong to appended claims of the invention.
Claims (4)
- A kind of 1. method for reducing terminal and falling back to Circuit Switching Network's number, it is characterised in that the described method comprises the following steps：When the moving exchanging center MSC in Circuit Switching Network/VLR Visitor Location Register VLR is sought by mobility management entity MME During terminal in paging system framework evolution SAE networks, the end in SAE networks is paged self by MME according to the triggering received The message at end judges whether also need to be communicated with the terminal after paging to terminal；The MSC/VLR detects what it was received Whether triggering is paged to include in the message of the terminal in SAE networks self by MME indicates MSC/VLR after paging to terminal also Need the mark to be communicated with the terminal；If comprising the mark, the MSC/VLR judges to also need to be communicated with the terminal after paging to terminal, then is receiving After the page response returned to the terminal by falling back to Circuit Switching Network, the connection with the terminal is maintained.
- 2. the method as described in claim 1, it is characterised in thatTrigger attaching position registers of the MSC/VLR by the message of the terminal in MME paging SAE networks for Circuit Switching Network The offer user profile PSI request messages that HLR is sent.
- 3. a kind of system for reducing terminal and falling back to Circuit Switching Network's number, it is characterised in that the system includes mobile switch Center MSC/ VLR Visitor Location Registers VLR, the MSC/VLR include paging module, judge module, wherein,The paging module, sought for receiving the triggering MSC/VLR from external equipment by mobility management entity MME The signal of terminal in paging system framework evolution SAE networks, and after the trigger signal is received, to judge module send whether Maintain the inquiry request of connection；And after the connection instruction of the maintenance from the judge module is received, sent out to the terminal Go out paging signal, and receive the terminal by fall back to Circuit Switching Network return page response after, maintain with the end The connection at end；The judge module, after receiving the inquiry request from the paging module, connect by detecting the MSC/VLR Whether the triggering received is paged self by MME arrives eventually in the message of the terminal in SAE networks comprising instruction MSC/VLR in paging The mark for also needing to be communicated with the terminal behind end judges that MSC/VLR is being paged to whether also needing to and the terminal after terminal Communicated, and when judging that MSC/VLR is also needing to be communicated with the terminal after paging to terminal, to the paging mould Block, which is sent, maintains connection instruction.
- 4. system as claimed in claim 3, it is characterised in that the MSC/VLR further comprises,The paging module, the offer user profile PSI that the attaching position register HLR for receiving Circuit Switching Network is sent After request message, the inquiry request for whether maintaining connection is sent to judge module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103024846B (en) * | 2012-12-28 | 2015-07-08 | 华为技术有限公司 | Business switching method, mobile terminal and mobile switching center |
| WO2015000121A1 (en) * | 2013-07-01 | 2015-01-08 | 华为技术有限公司 | Call processing method, device and mobility management entity |
| CN110324823B (en) * | 2019-07-04 | 2022-03-18 | 中国联合网络通信集团有限公司 | CSFB calling method and system |
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