CN102547653A - Method and system for reducing times of terminal falling to circuit switching network - Google Patents
Method and system for reducing times of terminal falling to circuit switching network Download PDFInfo
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- CN102547653A CN102547653A CN2011104582440A CN201110458244A CN102547653A CN 102547653 A CN102547653 A CN 102547653A CN 2011104582440 A CN2011104582440 A CN 2011104582440A CN 201110458244 A CN201110458244 A CN 201110458244A CN 102547653 A CN102547653 A CN 102547653A
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Abstract
The invention provides a method and a system for reducing times of a terminal falling to a circuit switching network, wherein the method comprises the steps of 1) when an MSC (mobile switching center)/ VLR (Visitor Location Register) in the circuit switching network pages a terminal in a system architecture evolution network by a mobile management entity, judging if the paged terminal needs to be communicated; and 2) if the MSC/VLR judges that the paged terminal needs to be communicated, maintaining the connection with the terminal after receiving the returned paging response of the terminal falling to the circuit switching network. Thus, the problem that the terminal performs several falling operations during the process that a traditional circuit switching network pages a terminal of an SAE (system architecture evolution) network can be avoided.
Description
Technical field
The present invention relates to the circuit switching fall-back technology, relate in particular to and reduce the method and system that Circuit Switching Network's number of times is fallen back at the terminal.
Background technology
System architecture evolution SAE network is third generation partner program (3rd Generation Partnership Project, the new generation of wireless network technology of 3GPP) organizing to set up in order to alternative legacy circuit-switched networks network.It is an inevitable trend that the SAE network substitutes the legacy circuit-switched networks network, but in a long-term time, the SAE network also needs and traditional circuit-switched network coexistence.SAE network as shown in Figure 1 and legacy circuit-switched networks network coexistence framework figure.
Wherein, The SAE network comprises Mobility Management Entity (Mobility Management Entity; MME), the evolution radio node (evolved NodeB, eNodeB), SAE gateway (System Architecture Evolution Gateway, SAE GW) and home subscriber server HSS.
ENodeB; On eating dishes without rice or wine, provide than global system for mobile communications wireless access network (Universal Mobile Telecommunication System Radio Access Network; UTRAN) higher up-downgoing speed, lower transmission delay and wireless transmission more reliably; And for the access at terminal provides Radio Resource, connect through the S1-C interface simultaneously and between the MME, connect through S1-U interface with the SAE gateway.
MME, chain of command entity, the server of interim storage terminal data (like the terminal context); For terminal distribution temporary mark whole world unique temporary identity (Globally Unique Temporary Identity, GUTI); Be responsible for authentication is carried out at the terminal of inserting from eNodeB.
The SAE gateway, user entity is responsible for the user face data route and is handled.SAE GW generally is divided into gateway Serving GW and packet data network gateway PDN GW; Wherein, Serving GW is responsible for the SAE Long Term Evolution ambulant anchor point between LTE and the UMTS UMTS of eating dishes without rice or wine, and triggers MME and serving GPRS support node SGSN paging by downlink data under the idle condition; PDN GW is responsible for playing the gateway function of terminal accessing group data network PDN (Packet Data Network), is terminal distribution IP (Internet Protoco1) address.Serving GW and PDN GW can close and be located in the physical equipment.
HSS is used to preserve the subscription data at terminal, writes down the MME title (MME NAME) at place, terminal simultaneously.
Traditional circuit-switched network comprises (the Mobile Switching Center of mobile switching centre; MSC), VLR Visitor Location Register (Visitor Location Register; VLR), 3G Radio Access Controller (Radio Network Controller, RNC) or 2G base station controller (Base Station Controller; BSC), attaching position register (Home Location Register; HLR), gateway MSC (Gateway Mobile Switching Center, GMSC) and professional control plane (Service Control Plan, SCP).
MSC is the switching center of GSM network, provide function of exchange and with system in being connected of other function, wherein be connected through the Iu interface with RNC or BSC; VLR then is a customer data base, is used for storing institute's compass of competency user profile, includes but not limited to user's signing service, supplementary service information and user activity information; Usually MSC and VLR close and put;
RNC and BSC are used to control the wireless activity with the office terminal.
HLR is used to preserve the CAMEL-Subscription-Information and the VLR address at terminal.Call out called in, HLR can from VLR obtain to be exhaled the terminal the animated walk-through number (Mobile Subscriber Roaming Number, MSRN).HLR and HSS can close and be located in the physical equipment.
GMSC is used to route the call to the MSC that terminal called belongs to.When calling out portable terminal, GMSC carries out routing call through the MSRN that HLR obtains terminal called according to MSRN.
SCP is used for service logic, the especially call logic of control terminal.When initiate or during receipt of call at the terminal, whether SCP can obtain the position at terminal from VLR through HLR, and computational costs, can continue with decision this callings, reaches the sustainable duration of calling.
In Fig. 1, also has the terminal (UE) that all can communicate by letter with SAE network and traditional circuit-switched network.Because the restriction and the energy-conservation demand of UE ability can only reside in the wireless system at same moment UE, when residing in the SAE network, can't directly receive beep-page message from traditional circuit-switched network as UE.
Because legacy circuit-switched networks network wireless coverage is better, serve comparatively stable, so it is the effectively additional of SAE network.When SAE can't provide satisfied traditional voice service, can transfer provided relevant service by the legacy circuit-switched networks network.This mechanism that return back to the legacy circuit-switched networks network is called circuit switching fall-back (Circuit Switch Fallback, CSFB) technology.The CSFB technology is built the SGs interface between the MSC/VLR of the MME of SAE and legacy circuit-switched networks network.Through this SGs interface, MME can let and reside in the position new technological process more that terminal among the SAE triggers the legacy circuit-switched networks network, registers at the legacy circuit-switched networks network when SAE is movable to accomplish UE, and concrete register flow path is as shown in Figure 2.
S201 in the SAE the terminal UE start or changed tracking area (Tracking Area, TA) after, UE initiates start (ATTACH) or tracing section updating (Tracking Area Update, TAU) message;
S202MME receives the registration of arriving HSS after the above-mentioned message;
After S203 succeeded in registration, MME derived the lane place (LAI, Location Area Identity) of UE in the legacy circuit-switched networks network through the tracking area that himself belongs to that UE reports, and navigates to the MSC/VLR corresponding with this lane place;
S204MME sends position updating request to this MSC/VLR through the SGs interface;
After S205MSC/VLR receives position updating request, detect the data of self whether having stored this UE, whether the UE data of perhaps having stored are accurate; If detect the data of self not storing this UE, when the UE data of perhaps having stored were inaccurate, MSC/VLR sent position updating request to HLR; If detect the data of self having stored this UE, and the UE data of having stored are when accurate, execution in step S209;
S206HLR sends to MSC/VLR and inserts user data requests;
S207MSC/VLR upgrades the UE positional information, and returns the response of insertion user data to HLR;
S208HLR upgrades success response to the MSC/VLR home position, the number of record UE place MSC/VLR;
S209MSC/VLR returns the SGs interface position to MME and upgrades success response, and the status modifier of SGs interface is activation.
UE among the SAE just can receive the called call request from the legacy circuit-switched networks network with the mode of CSFB after the legacy circuit-switched networks network is registered.The flow process of calling out the UE among the SAE through the legacy circuit-switched networks network is as shown in Figure 3.Supposition UE has contracted and has exhaled of legacy circuit-switched networks network IN service eventually in this flow process.
S301 GMSC receive initial address message to this UE (Initial Address Message, IAM), the UE mobile user comprehensive service digital net number MSISDN (being the UE telephone number) that carries according to this IAM finds the HLR of UE;
S302GMSC obtains routing iinformation to the HLR transmission, and (Send Routing Information SRI) asks, and carries the Mobile Subscriber International ISDN Number of UE in this request;
Because this UE exhales eventually the IN service contracted user, HLR need at first to GMSC return exhale eventually the IN service CAMEL-Subscription-Information (Terminating CAMEL Subscription Information, T-CSI);
S303HLR returns T-CSI to GMSC;
S304GMSC triggers according to T-CSI and exhales IN service eventually, and transmission initialization monitoring point (Initial Detection Point, IDP) message is to SCP;
S305 be because SCP need obtain the positional information of UE in Business Processing, thus SCP send inquiry at any time (Any Time Interrogation, ATI) message is to HLR;
S306HLR finds the MSC/VLR number of UE according to the Mobile Subscriber International ISDN Number of UE, and sends to this MSC/VLR and user profile to be provided (request MSC/VLR provide UE positional information at the legacy circuit-switched networks network for Provide Subscriber Info, PSI) request;
S307 is because UE resides in the SAE network at this moment, so MSC/VLR sends paging Paging message to MME through the SGs interface;
S308MME paging UE, and notice UE falls back to the legacy circuit-switched networks network in beep-page message;
After S309UE receives beep-page message, fall back to the legacy circuit-switched networks network;
S310UE returns page response through the legacy circuit-switched networks network to MSC/VLR;
S311MSC/VLR obtains the positional information of UE from page response, this positional information is sent to HLR through the PSI response; Because this PSI treatment progress finishes, MSC/VLR discharges and being connected of UE simultaneously;
S312UE returns the SAE network;
S313HLR is carried at the UE positional information in the ATI response and returns to SCP;
S314SCP confirms to call out and can continue, and sends and calls out continuation message to GMSC;
S315GMSC sends SRI once more and asks HLR, wherein carries and suppresses the T-CSI mark;
The S316HLR transmission Provides Roaming Number, and (Provide Roaming Number PRN) asks MSC/VLR;
S317MSC/VLR distributes the casual user to identify MSRN to HLR, this MSRN unique identification MSC/VLR and UE;
S318HLR returns SRI and responds to GMSC, carries MSRN;
S319GMSC routes the call to MSC/VLR according to MSRN;
S320 is because UE has returned LTE, so MSC/VLR sends Paging message to MME once more through the SGs interface;
S321MME paging UE process, notice UE falls back to the legacy circuit-switched networks network in beep-page message;
After S322UE receives beep-page message, fall back to the legacy circuit-switched networks network once more;
S323UE returns page response through the legacy circuit-switched networks network to MSC/VLR;
S324MSC/VLR sends to UE with setup requests Setup
S325MSC/VLR accomplishes the remaining called process of setting up with UE.
Said process, the SCP in the circuit-switched network through HLR to MSC/VLR send the PSI message trigger MSC/VLR send beep-page message and impel this terminal to fall back to circuit-switched network through the terminal of SGs interface in the SAE network.But after MSC/VLR got access to location information of terminals, MSC/VLR release was connected with UE's.The follow-up call arrival MSC/VLR that sends as GMSC, because UE has returned LTE, MSC/VLR also needs to send beep-page message and impel this terminal to fall back to circuit-switched network through the terminal of SGs interface in the SAE network once more.Have the paging and the UE of twice SGs mouth to fall operation after rise in the entire process, process is redundant, inefficiency.
Summary of the invention
The invention provides a kind of method and MSC/VLR that falls back to Circuit Switching Network's number of times in the terminal that reduce, how to avoid from the process at the terminal of legacy circuit-switched networks paging SAE net the terminal to carry out the technical problem that repeatedly falls operation after rise to solve.
For solving the problems of the technologies described above, the invention provides a kind of method that Circuit Switching Network's number of times is fallen back at the terminal that reduces, said method comprising the steps of:
When the mobile switching centre in the Circuit Switching Network (MSC)/VLR Visitor Location Register (VLR) passes through the terminal in Mobility Management Entity (MME) paging system framework evolution (SAE) network, judge whether paging also need communicate with this terminal behind the terminal;
If said MSC/VLR judges paging and behind the terminal, also need communicate with this terminal, then receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal.
Further, said MSC/VLR judges whether paging also need communicate with this terminal behind the terminal and comprises:
Said MSC/VLR detects whether comprise the sign that instruct MS C/VLR also need communicate with this terminal behind the terminal in paging in the message of its triggering that receives self through the terminal in the MME paging SAE network; If comprise this sign; Then MSC/VLR receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal.
Further, trigger the message of MSC/VLR through the terminal in the MME paging SAE network be the attaching position register (HLR) of Circuit Switching Network send user profile (PSI) request message is provided.
For solving the problems of the technologies described above, the invention provides a kind of system that Circuit Switching Network's number of times is fallen back at the terminal that reduces, said system comprises mobile switching centre (MSC)/VLR Visitor Location Register (VLR), said MSC/VLR comprises paging module, judge module, wherein,
Said paging module; Be used for receiving the signal through the terminal of Mobility Management Entity (MME) paging system framework evolution (SAE) network from the said MSC/VLR of the triggering of external equipment; And after receiving this triggering signal, send the query requests of whether keeping connection to judge module; And receive connect indication from keeping of said judge module after, send paging signal to said terminal, and receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal;
Said judge module after being used to receive the query requests from said paging module, judges whether MSC/VLR also need communicate with this terminal behind the terminal in paging; And judging MSC/VLR when paging also need communicate with this terminal behind the terminal, send to keep to connect to said paging module and indicate.
Further, said MSC/VLR comprises,
Said judge module is used for whether comprising instruct MS C/VLR in the message of triggering self through the terminal of MME paging SAE network that said MSC/VLR receives and behind the terminal, also need judging whether MSC/VLR also need communicate with this terminal behind the terminal in paging with the sign that this terminal communicates in paging through detecting.
Further, said MSC/VLR comprises,
Said paging module, be used to receive the attaching position register (HLR) of Circuit Switching Network sends user profile (PSI) request message is provided after, send the query requests of whether keeping connection to judge module.
MSC/VLR in the technique scheme also need communicate with this terminal behind the terminal in the SAE network if judge paging; Receive the terminal through the page response that falls back to Circuit Switching Network and return after; Continue to keep and being connected of this terminal; Receiving the terminal with respect to prior art MSC/VLR just breaks off with regard to being connected of this terminal after through the page response that falls back to Circuit Switching Network and return; Can avoid follow-up MSC/VLR to send beep-page message and impel this terminal to fall back to circuit-switched network once more in the terminal in the SAE network once more, simplify the Message Processing flow process, practice thrift Internet resources.
Description of drawings
Fig. 1 is prior art SAE network and legacy circuit-switched networks network coexistence framework figure;
Fig. 2 is prior art UE signal flow graph in the registration of legacy circuit-switched networks network when SAE is movable;
Fig. 3 calls out the signal flow graph of the UE among the SAE through the legacy circuit-switched networks network for prior art;
Fig. 4 falls back to the method flow diagram of Circuit Switching Network's number of times for the minimizing terminal of present embodiment;
Fig. 5 calls out the signal flow graph of the UE among the SAE for the legacy circuit-switched networks network that should use example;
Fig. 6 falls back to the internal module figure of the MSC/VLR of Circuit Switching Network's number of times for the minimizing terminal of present embodiment.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, hereinafter will combine accompanying drawing that embodiments of the invention are elaborated.Need to prove that under the situation of not conflicting, embodiment among the application and the characteristic among the embodiment be combination in any each other.
Fig. 4 falls back to the method flow diagram of Circuit Switching Network's number of times for the minimizing terminal of present embodiment.
S401MSC/VLR receives the message that triggers through the terminal in the MME paging SAE network;
S402MSC/VLR judges whether paging also need communicate with this terminal behind the terminal, if desired, and execution in step S403; Otherwise, execution in step S404;
Whether said MSC/VLR can comprise instruct MS C/VLR in the sign that paging also need communicate with this terminal behind the terminal through detecting in the message of its triggering that receives self through the terminal in the MME paging SAE network, judge whether paging also need communicate with this terminal behind the terminal;
That triggers that the message of MSC/VLR through the terminal in the MME paging SAE network can be attaching position register (HLR) from Circuit Switching Network provides user profile (PSI) request; Above-mentioned sign is sent to MSC/VLR with this PSI after can being added into PSI by HLR;
S403MSC/VLR is through the terminal in the MME paging SAE network, and receive the terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of this terminal;
The S404 flow process finishes.
Signal flow with the UE among the legacy circuit-switched networks network calling SAE is that the method flow that example falls back to Circuit Switching Network's number of times to the minimizing terminal of above-mentioned present embodiment is described further below.
Fig. 5 calls out the signal flow graph of the UE among the SAE for the legacy circuit-switched networks network that should use example.Supposition UE has contracted and has exhaled of legacy circuit-switched networks network IN service eventually in this flow process.
S501GMSC receive initial address message to this UE (Initial Address Message, IAM), the UE mobile user comprehensive service digital net number MSISDN (being the UE telephone number) that carries according to this IAM finds the HLR of UE;
S502GMSC obtains routing iinformation to the HLR transmission, and (Send Routing Information SRI) asks, and carries the Mobile Subscriber International ISDN Number of UE in this request;
S503HLR returns T-CSI to GMSC;
S504GMSC triggers according to T-CSI and exhales IN service eventually, and transmission initialization monitoring point (Initial Detection Point, IDP) message is to SCP;
S505 be because SCP need obtain the positional information of UE in Business Processing, thus SCP send inquiry at any time (Any Time Interrogation, ATI) message is to HLR;
S506HLR finds the MSC/VLR number of UE according to the Mobile Subscriber International ISDN Number of UE, and sends to this MSC/VLR and user profile to be provided (request MSC/VLR provide UE positional information at the legacy circuit-switched networks network for Provide Subscriber Info, PSI) request; Simultaneously, HLR adds the sign that instruct MS C/VLR also need communicate with this UE behind the UE in paging in PSI request;
S507 is because UE resides in the SAE network at this moment, so MSC/VLR sends Paging message to MME through the SGs interface;
S508MME paging UE, and notice UE falls back to the legacy circuit-switched networks network in beep-page message;
After S509UE receives beep-page message, fall back to the legacy circuit-switched networks network;
S510UE returns page response through the legacy circuit-switched networks network to MSC/VLR;
S511MSC/VLR obtains the positional information of UE from page response, this positional information is sent to HLR through the PSI response; MSC/VLR keeps being connected of current and UE;
S512HLR is carried at the UE positional information in the ATI response and returns to SCP;
S513SCP confirms to call out and can continue, and sends and calls out continuation message to GMSC;
S514GMSC sends SRI once more and asks HLR, wherein carries and suppresses the T-CSI mark;
The S515HLR transmission Provides Roaming Number, and (Provide Roaming Number PRN) asks MSC/VLR;
S516MSC/VLR distributes the casual user to identify MSRN to HLR, this MSRN unique identification MSC/VLR and UE;
S517HLR returns SRI and responds to GMSC, carries MSRN;
S518GMSC routes the call to MSC/VLR according to MSRN;
S519 is because MSC/VLR keeps being connected of current and UE, so MSC/VLR can directly send to UE with setup requests Setup;
S520MSC/VLR accomplishes the remaining called process of setting up with UE.
Fig. 6 falls back to the internal module figure of the MSC/VLR of Circuit Switching Network's number of times for the minimizing terminal of present embodiment.
This MSC/VLR comprises paging module, judge module, wherein,
The paging module; Be used for receiving the signal through the terminal of Mobility Management Entity (MME) paging system framework evolution (SAE) network from the said MSC/VLR of the triggering of external equipment; And after receiving this triggering signal, send the query requests of whether keeping connection to judge module; And receive connect indication from keeping of said judge module after, send paging signal to said terminal, and receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal;
This paging module, can be used for receiving the attaching position register (HLR) of Circuit Switching Network sends user profile (PSI) request message is provided after, send the query requests of whether keeping connection to judge module.
Judge module after being used to receive the query requests from said paging module, judges whether MSC/VLR also need communicate with this terminal behind the terminal in paging; And judging MSC/VLR when paging also need communicate with this terminal behind the terminal, send to keep to connect to said paging module and indicate.
This judge module can be used for whether comprising instruct MS C/VLR in the message of triggering self through the terminal in the MME paging SAE network that said MSC/VLR receives and behind the terminal, also need judging whether MSC/VLR also need communicate with this terminal behind the terminal in paging with the sign that this terminal communicates in paging through detecting.
One of ordinary skill in the art will appreciate that all or part of step in the said method can instruct related hardware to accomplish through program, said program can be stored in the computer-readable recording medium, like read-only memory, disk or CD etc.Alternatively, all or part of step of the foregoing description also can use one or more integrated circuits to realize, correspondingly, each the module/unit in the foregoing description can adopt the form of hardware to realize, also can adopt the form of software function module to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.
Need to prove; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. one kind is reduced the method that Circuit Switching Network's number of times is fallen back at the terminal, it is characterized in that, said method comprising the steps of:
When the mobile switching centre in the Circuit Switching Network (MSC)/VLR Visitor Location Register (VLR) passes through the terminal in Mobility Management Entity (MME) paging system framework evolution (SAE) network, judge whether paging also need communicate with this terminal behind the terminal;
If said MSC/VLR judges paging and behind the terminal, also need communicate with this terminal, then receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal.
2. the method for claim 1 is characterized in that, said MSC/VLR judges whether paging also need communicate further with this terminal behind the terminal and comprises:
Said MSC/VLR detects whether comprise the sign that instruct MS C/VLR also need communicate with this terminal behind the terminal in paging in the message of its triggering that receives self through the terminal in the MME paging SAE network; If comprise this sign; Then MSC/VLR receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal.
3. method as claimed in claim 2 is characterized in that,
Trigger the message of MSC/VLR through the terminal in the MME paging SAE network and be that the attaching position register (HLR) of Circuit Switching Network sends that user profile (PSI) request message is provided.
4. one kind is reduced the system that Circuit Switching Network's number of times is fallen back at the terminal, it is characterized in that, said system comprises mobile switching centre (MSC)/VLR Visitor Location Register (VLR), and said MSC/VLR comprises paging module, judge module, wherein,
Said paging module; Be used for receiving the signal through the terminal of Mobility Management Entity (MME) paging system framework evolution (SAE) network from the said MSC/VLR of the triggering of external equipment; And after receiving this triggering signal, send the query requests of whether keeping connection to judge module; And receive connect indication from keeping of said judge module after, send paging signal to said terminal, and receive said terminal through the page response that falls back to Circuit Switching Network and return after, keep and being connected of said terminal;
Said judge module after being used to receive the query requests from said paging module, judges whether MSC/VLR also need communicate with this terminal behind the terminal in paging; And judging MSC/VLR when paging also need communicate with this terminal behind the terminal, send to keep to connect to said paging module and indicate.
5. system as claimed in claim 4 is characterized in that, said MSC/VLR further comprises,
Said judge module is used for whether comprising instruct MS C/VLR in the message of triggering self through the terminal of MME paging SAE network that said MSC/VLR receives and behind the terminal, also need judging whether MSC/VLR also need communicate with this terminal behind the terminal in paging with the sign that this terminal communicates in paging through detecting.
6. system as claimed in claim 5 is characterized in that, said MSC/VLR further comprises,
Said paging module, be used to receive the attaching position register (HLR) of Circuit Switching Network sends user profile (PSI) request message is provided after, send the query requests of whether keeping connection to judge module.
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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 |
| CN104488323A (en) * | 2013-07-01 | 2015-04-01 | 华为技术有限公司 | Call processing method, device and mobility management entity |
| CN104488323B (en) * | 2013-07-01 | 2019-03-26 | 华为技术有限公司 | A kind of method of call treatment, equipment and mobility management entity |
| CN110324823A (en) * | 2019-07-04 | 2019-10-11 | 中国联合网络通信集团有限公司 | A kind of CSFB method of calling, system |
| 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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