CN101909342B - Method and system for circuit switching fall-back and access network elements - Google Patents
Method and system for circuit switching fall-back and access network elements Download PDFInfo
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- CN101909342B CN101909342B CN200910086113A CN200910086113A CN101909342B CN 101909342 B CN101909342 B CN 101909342B CN 200910086113 A CN200910086113 A CN 200910086113A CN 200910086113 A CN200910086113 A CN 200910086113A CN 101909342 B CN101909342 B CN 101909342B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
- H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
- H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
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Abstract
The embodiment of the invention discloses a method and a system for circuit switching fall-back and access network elements, wherein the method comprises the following steps of: receiving a business expansion request, which carries a circuit switching (CS) fall-back instruction, sent by UE by a first access network element; performing interaction with the UE to determine a target carrier frequency to be fallen back to a second network of the UE; acquiring expense parameter information of the target carrier frequency from IWF, and sending the expense parameter information of the target carrier frequency to the UE; receiving a second network initial paging message or a second network paging response message which is constructed and sent by the UE according to the expense parameter information of the target carrier frequency, and transmitting the second network initial paging message or the second network paging response message to the IWF; and receiving a second network air interface service channel resource which is returned by the IWF and is distributed to the UE, and indicating the UE to fall back to the second network from a first network. The embodiment reduces the time for the UE to send the paging response message or the initial paging message in the fall-back process of a network, and reduces the time delay of the UE to fall back into a target network.
Description
Technical field
The present invention relates to the communication technology, especially a kind of circuit switching fall-back method and system, access network elements.
Background technology
In order to tackle the challenge of wireless broad band technology; Keep third generation collaborative project (3rd GenerationPartnership Project; Hereinafter to be referred as the 3GPP) leading superiority of network, 3GPP will have formulated Long Term Evolution in the end of the year 2004, and (Long Term Evolution is hereinafter to be referred as LTE) plan.At present; Code division multiple access (Code Division Multiple Access; Hereinafter to be referred as: CDMA) 1X operator tend to select the LTE network as next generation network (Next Generation Network, hereinafter to be referred as: NGN), to satisfy growing wireless data service demand.Because the LTE network can not once put in place right, therefore, CDMA 1X operator can at first be chosen in hot zones and dispose the LTE network, and then enlarges the deployment scope of LTE network gradually.Because existing C DMA 1X network coverage is very big, disposes the LTE network at hot zones and be equivalent to the LTE network is added on the CDMA 1X network.CDMA 1X network diagram as shown in Figure 1, disposed the LTE network at hot zones for prior art.
In order to make full use of existing Internet resources, operator will utilize existing C DMA 1X network to greatest extent disposing the LTE network with when satisfying data service.Therefore; CDMA 1X operator will be beneficial to and utilize the LTE network for the user data service to be provided, and utilize CDMA 1X network for the user speech business to be provided, relevant user terminals (User Equipment; Hereinafter to be referred as: UE) for supporting the dual-mode terminal of CDMA 1X technology and LTE technology simultaneously; For this UE, can in the LTE network, use data service, also can in CDMA 1X network, use speech business.But the UE synchronization can only use professional in a kind of network.
When UE was positioned at the LTE network coverage area, it resided in the LTE network, and no longer monitored the CDMA signal.At this moment, if the user need use speech business in CDMA 1X network, then need fall back to CDMA 1X network by the LTE network.As shown in Figure 2; Be prior art CDMA 1X circuit switching (CircuitSwitched; Hereinafter to be referred as: CS) fall the networking sketch map after rise, it comprise CDMA 1X network entity, LTE network entity and 1X CS interworking function entity (Interworking Function, hereinafter to be referred as: IWF).Wherein, CDMA 1X network entity comprises 1X Radio Transmission Technology (1X Radio TransmissionTechnology; Hereinafter to be referred as: 1XRTT) base station sub-system (Base Station Subsystem; Hereinafter to be referred as: BSS) with 1XRTT mobile switching centre (Mobile Switch Center, hereinafter to be referred as: MSC).The LTE network entity comprises base station (the evolved Node Base of evolution; Hereinafter to be referred as: eNodeB), mobile management entity (Mobility Management Entity; Hereinafter to be referred as: MME) with gateway (Serving Gateway, hereinafter to be referred as: S-GW).Wherein, 1XRTT BSS is used to the wireless access function of eating dishes without rice or wine that UE provides CDMA 1X; 1XRTT MSC is used to UE provides the speech business hand-deliver of CDMA 1X to change function and mobile management function, comprising: correlation functions such as registration, paging, authentication; ENodeB is used to the wireless access function of eating dishes without rice or wine that UE provides LTE; MME is used to the mobile management function that UE provides LTE.S-GW is used to eNodeB service surface data gateway function is provided, that is: LTE service in base station convergence forwarding capability is provided; 1XCS IWF is used to be connected LTE network entity and CDMA 1X network entity, and the IWF of LTE network entity and CDMA 1X network entity is provided, to realize the falling of 1XCS.
In the time of need falling back to CDMA 1X network by the LTE network for the called subscriber,, beep-page message is forwarded to MME, by MME this beep-page message is mail to UE again by 1XCS IWF if 1XRTT MSC mails to 1XCS IWF through the A1 interface with beep-page message.After UE receives this beep-page message, will leave the LTE network insertion and carry out page response, and carry out called voice service at CDMA 1X network to CDMA 1X network.
In the time of need falling back to CDMA 1X network by the LTE network for the calling subscriber, UE will leave the LTE network and be linked into CDMA 1X network when preparing to initiate audio call and carry out the caller speech business.
1XRTT CS after Fig. 3 receives beep-page message for prior art UE or prepares to initiate audio call falls flow chart after rise.As shown in Figure 3, receive the beep-page message that MME transmits as called subscriber's UE after, or be calling subscriber's UE when preparing to initiate audio call, the execution following steps:
Step 101, UE is current be in evolution the Universal Mobile Telecommunications System land radio access web (EvolvedUMTS Terrestrial Radio Access Network, hereinafter to be referred as: E-UTRAN) and attached in the LTE network.And UE registers in CDMA 1X network, that is: UE is registered among the 1XRTTMSC.At this moment, UE prepares to fall back to CDMA 1X network and carries out speech business.
Step 102, UE sends the request message of activating business to MME, carries CS in the request message of activating business and falls indication after rise, and expression need be fallen back to CDMA 1X network.
Step 103, MME sends S1 Application Protocol to eNodeB, and (S1 Application Protocol hereinafter to be referred as message S1 AP), wherein carries CS and falls indication after rise, and CDMA 1X network is fallen back in expression UE request.
Step 104, eNodeB request UE reports CDMA 1X measurement report, comprises the metrical information of E-UTRAN in the CDMA 1X measurement report that UE reports.
Step 105, eNodeB confirms the CDMA 1X target carrier frequency of UE falling and the physical district ID of this target carrier frequency according to the CDMA 1X measurement report that UE reports.
Wherein, step 104 and step 105 are optional, that is: also not execution in step 104 and step 105, and step 103 back is execution in step 106 directly.
Step 106, eNodeB to UE send Radio Resource control (Radio Resource Control, hereinafter to be referred as RRC) connection release message, the CDMA 1X target carrier frequency that is redirected comprising UE.
Step 107, UE leaves the LTE network after receiving the RRC connection release message of eNodeB transmission, and inserts the target carrier frequency that the RRC connection release message is carried, and inserts CDMA 1X network that is:.
Step 108; UE monitors the Overhead Message (Overhead Message) that 1XRTT BSS broadcasts through PCH among the CDMA 1X on the target carrier frequency that inserts, comprise expense parameters such as system parameters message, access parameter messages, expanding system parameter, expansion CDMA Channel List Message in this Overhead Message.
Step 109, after UE was received Overhead Message, the access channel according to a CDMA 1X carrier frequency of expense parameter selection sent random accessing message on this access channel, initiate random access procedure.Afterwards, if UE is a called UE, then on access channel, send CDMA 1X page-response message to 1XRTT BSS; If UE is a calling UE, then on access channel, send CDMA 1X initial call message to 1XRTT BSS.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
After UE inserts CDMA 1X network; Need to monitor the Overhead Message of 1XRTT BSS broadcasting; After only receiving these Overhead Messages; Could select access channel and initiate random access procedure according to expense parameter wherein, could on access channel, send CDMA 1X page-response message or CDMA 1X initial call message afterwards.And according to existing scheme; The broadcast cycle of Overhead Message is 1.28 seconds (s); UE initiates random access procedure needs 200～400 milliseconds (ms); The existence of this two parts time has increased the time that UE sends CDMA 1X page-response message or CDMA 1X initial call message, causes the time delay of UE access CDMA1X longer.
Summary of the invention
The embodiment of the invention provides a kind of circuit switching fall-back method and system, access network elements, reduces UE sends message in network falling process time, reduces the time delay that UE falls back to objective network.
A kind of circuit switching fall-back method that the embodiment of the invention provides comprises:
First access network elements in first network receives the request of activating business that user terminal UE sends, and carries circuit switching (CS) in this request of activating business and falls indication after rise, and this CS falls indication after rise and is used for representing that UE need fall back to second network;
Target carrier frequency in second network that definite alternately this UE of said first access network elements and said UE need fall back to;
Said first access network elements obtains the expense parameter information of said target carrier frequency from interworking function entity IWF, and the expense parameter information of this target carrier frequency is sent to said UE;
Said first access network elements receives said UE according to the expense parameter information structure of said target carrier frequency and the second network initial call message or the second ICQ response message that sends, and this second network initial call message or the second ICQ response message are transmitted to said IWF;
Second network that distributes to said UE that said first access network elements receives that said IWF the returns traffic channel resource of eating dishes without rice or wine, and indicate said UE to fall back to said second network from said first network.
A kind of access network elements that the embodiment of the invention provides, said access network elements are first access network elements in first network, and said first access network elements comprises:
Receiver module; Be used to receive the request of activating business that UE sends; Carry CS in this request of activating business and fall indication after rise; This CS falls indication after rise and is used for representing that UE need fall back to second network, receives the second network initial call message or the second ICQ response message that said UE sends, and second network that distributes to said UE that returns of the IWF traffic channel resource of eating dishes without rice or wine;
Determination module is used for confirming alternately with said UE the target carrier frequency of second network that this UE need fall back to;
Acquisition module is used for obtaining from IWF the expense parameter information of said target carrier frequency, and the expense parameter information of this target carrier frequency is sent to said UE;
Sending module; Be used for when said receiver module receives said UE according to the expense parameter information of said target carrier frequency structure and said second network initial call message that sends or the said second ICQ response message, this second network initial call message or the second ICQ response message being transmitted to said IWF;
Indicating module is used for receiving said second network at said receiver module and eats dishes without rice or wine behind the traffic channel resource, indicates said sending module to send Indication message to said UE, and this Indication message is used to indicate said UE to fall back to said second network from said first network.
A kind of circuit switching fall-back system that the embodiment of the invention provides; Comprise first network and second network; First access network elements in said first network is used to receive the request of activating business that UE sends; Carry CS in this request of activating business and fall indication after rise, this CS falls indication after rise and is used for representing that UE need fall back to second network; Confirm the target carrier frequency in second network that this UE need fall back to alternately with said UE; Obtain the expense parameter information of said target carrier frequency from IWF, and the expense parameter information of this target carrier frequency is sent to said UE; Receive said UE according to the expense parameter information structure of said target carrier frequency and the second network initial call message or the second ICQ response message that sends, and this second network initial call message or the second ICQ response message are transmitted to said IWF; Second network that distributes to said UE that receives that said IWF the returns traffic channel resource of eating dishes without rice or wine, and indicate said UE to fall back to said second network from said first network.
The circuit switching fall-back method and system, the access network elements that provide based on the above embodiment of the present invention; First access network elements can be confirmed the target carrier frequency in second network that UE need fall back to alternately with UE; And send to UE obtain the expense parameter information of target carrier frequency from IWF after; Make UE directly to construct the second network initial call message or the second ICQ response message according to the expense parameter information of this target carrier frequency; First access network elements receives second network to UE distributes that IWF returns to the second network initial call message or the second ICQ response message and eats dishes without rice or wine directly to indicate UE to fall back to second network from first network, therefore behind the traffic channel resource; Need not to monitor and receive the Overhead Message of Web broadcast in second network and initiate random access procedure; Thereby reduced the time that UE sends the second network initial call message or the second ICQ response message, reduced the time delay that UE inserts second network, improved user's business experience.
Through accompanying drawing and embodiment, technical scheme of the present invention is done further detailed description below.
Description of drawings
Fig. 1 has disposed the LTE network for prior art at hot zones CDMA 1X network diagram;
Fig. 2 is that prior art CDMA 1X CS falls the networking sketch map after rise;
1XRTTCS after Fig. 3 receives beep-page message for prior art UE or prepares to initiate audio call falls flow chart after rise;
Fig. 4 is the flow chart of an embodiment of CS drop method of the present invention;
Fig. 5 is the flow chart of another embodiment of CS drop method of the present invention;
Fig. 6 is the flow chart of another embodiment of CS drop method of the present invention;
Fig. 7 is the flow chart of another embodiment of CS drop method of the present invention;
Fig. 8 is the flow chart of another embodiment of CS drop method of the present invention;
Fig. 9 is the structural representation of an embodiment of access network elements of the present invention.
Embodiment
Fig. 4 is the flow chart of an embodiment of CS drop method of the present invention.As shown in Figure 4, it may further comprise the steps:
Step 201, first access network elements in first network receives the request of activating business that UE sends, and wherein carries CS and falls indication after rise, and this CS falls indication after rise and is used for representing that UE need fall back to second network.
Step 202, the target carrier frequency in second network that the definite alternately UE of first access network elements and UE need fall back to.
As one embodiment of the present of invention, second network can be a CDMA 1X network; Accordingly, first network is other arbitrary network beyond the CDMA 1X network.
Step 203, first access network elements obtains the expense parameter information of target carrier frequency from IWF, and the expense parameter information of this target carrier frequency is sent to UE.
Step 204; First access network elements receives UE according to the expense parameter information structure of target carrier frequency and the second network initial call message or the second ICQ response message that sends, and this second network initial call message or the second ICQ response message are transmitted to IWF.
Second network that distributes to UE that step 205, first access network elements receive that IWF the returns traffic channel resource of eating dishes without rice or wine, and indication UE falls back to second network from first network.
In the embodiment of the invention; First access network elements can be confirmed the target carrier frequency in second network that UE need fall back to alternately with UE; And send to UE obtain the expense parameter information of target carrier frequency from IWF after; Make UE directly to construct the second network initial call message or the second ICQ response message according to the expense parameter information of this target carrier frequency; First access network elements receives second network to UE distributes that IWF returns to the second network initial call message or the second ICQ response message and eats dishes without rice or wine directly to indicate UE to fall back to second network from first network, therefore behind the traffic channel resource; Need not to monitor and receive the Overhead Message of Web broadcast in second network and initiate random access procedure; Thereby reduced the time that UE sends the second network initial call message or the second ICQ response message, reduced the time delay that UE inserts second network, improved user's business experience.
Fig. 5 is the flow chart of another embodiment of CS drop method of the present invention.Among this embodiment, be that example describes as calling UE with UE.As shown in Figure 5, it may further comprise the steps:
Step 301, UE is attached in first network and be arranged in the Access Network of first network, and UE carries out the registration of CS territory through access network elements in first network and 1X CS IWF to 1XRTT MSC.Wherein, the Access Network in first network is also referred to as: first Access Network.Access network elements in first network is also referred to as: first access network elements.
Step 302, UE need initiate second network, that is: during the CS territory voice call service in the CDMA 1X network, send CS to first access network elements and fall indication after rise.
Step 303; First access network elements and UE carry out alternately; Confirm the target carrier frequency in the CDMA1X network that UE need fall back to, this target carrier frequency is made up of with physical district ID two parts the carrier frequency numbering, and physical district ID wherein also is pilot offset (PN Offset).
Step 304, first access network elements are obtained the expense parameter information of the target carrier frequency that UE need fall back to from 1XCS IWF.
As one embodiment of the present of invention; This step 304 also can be carried out prior to step 303; Perhaps carrying out simultaneously with step 303, is the up-to-date expense parameter information of the UE target carrier frequency that need fall back to as long as guarantee the expense parameter information that gets access to through this step 304.
Step 305, first access network elements issues the warning order of leaving for preparing to exit first Access Network to UE, and this leaves the expense parameter information that comprises the target carrier frequency that need fall back in the warning order.
Step 306, the expense parameter information of the target carrier frequency that UE falls back to as required through the carrying mechanism of first access network elements, is left preparation request to the transmission of first access network elements, and this leaves and comprises initial call message in the preparation request.
Step 307 after first access network elements receives and leaves preparation request, is forwarded to 1XCS IWF with leaving the initial call message that carries in the preparation request.
Whether step 308 after 1XCS IWF receives initial call message, is discerned this 1XCS IWF and is integrated among the 1XRTT BSS in the CDMA 1X network and whether the target carrier frequency of carrying in the initial call message belongs to this 1XRTT BSS.If 1XCS IWF is integrated among the 1XRTT BSS, and the target carrier frequency of carrying in the initial call message belongs to this 1XRTT BSS, then distributes the CDMA 1X traffic channel resource of eating dishes without rice or wine by 1XRTT IWF/BSS to UE.Otherwise; If 1XCS IWF is not integrated among the 1XRTT BSS; The target carrier frequency of perhaps carrying in the initial call message does not belong to this 1XRTT BSS; Then initiate the process of direct-cut operation to 1XRTT MSC, and obtain this 1XRTT BSS to the CDMA 1X of the UE distribution traffic channel resource of eating dishes without rice or wine from 1XRTT BSS to 1XRTT BSS by 1XCS IWF.
Step 309,1XCS IWF sends switch indicating information to first access network elements, and indication UE switches to CDMA 1X network by first network, carries the CDMA1X that distributes to the UE traffic channel resource of eating dishes without rice or wine in this switch indicating information.
Step 310, first access network elements issues the order of leaving of leaving first Access Network to UE, and this leaves the CDMA 1X that carries in the order in the switch indicating information traffic channel resource of eating dishes without rice or wine.
Step 311, UE leaves first Access Network after receiving and leaving order, and catches and leave the CDMA 1X that comprises in the order Traffic Channel of eating dishes without rice or wine.Behind the acquisition success, send CS territory voice call service handoff completion message to 1XRTT BSS.
Step 312, after 1XCS BSS received CS territory voice call service handoff completion message, whether identification UE was to switch from other 1XCS BSS to come.If then send CS territory voice call service handoff completion message to 1xRTT MSC; Otherwise, send the voice call service assignment of CS territory to 1XRTT MSC and accomplish message.
Step 313 after 1XRTT MSC receives handoff completion message, is initiated reset procedure to 1XCS IWF, removes the relevant information that 1XRTT MSC and 1XCS IWF produce in this CS territory voice call service handoff procedure.
Step 314, first access network elements is initiated the resource dispose procedure, discharges the UE context resource.
As one embodiment of the present of invention, this step 314 can be carried out any time after step 309, that is: can carry out prior to any step of step 310-314, also can carry out with any step of step 310-314.
Fig. 6 is the flow chart of another embodiment of CS drop method of the present invention.Among this embodiment, be that example describes as called UE with UE.As shown in Figure 6, it may further comprise the steps:
Step 401, UE is attached in first network and be arranged in the Access Network of first network, and, carry out the registration of CS territory through first access network elements in first network and 1XCS IWF to 1XRTT MSC.
Step 402, second network, that is: the 1XRTT MSC in the CDMA 1X network sends paging request to 1XCS IWF.
Step 403,1XCS IWF sends CS territory voice paging request through first access network elements to UE.
Step 404, UE sends CS to first access network elements and falls indication after rise.
Step 405, first access network elements and UE carry out alternately, confirm the target carrier frequency in the CDMA1X network that UE need fall back to, and this target carrier frequency is made up of with physical district ID two parts the carrier frequency numbering, and physical district ID wherein also is a pilot offset.
Step 406, first access network elements are obtained the expense parameter information of the target carrier frequency that UE need fall back to from 1XCS IWF.
As one embodiment of the present of invention; This step 406 also can be carried out prior to step 405; Perhaps carrying out simultaneously with step 405, is the up-to-date expense parameter information of the UE target carrier frequency that need fall back to as long as guarantee the expense parameter information that gets access to through this step 406.
Step 407, first access network elements issues the warning order of leaving for preparing to exit first Access Network to UE, and this leaves the expense parameter information that comprises the target carrier frequency that need fall back in the warning order.
Step 408; The expense parameter information of the target carrier frequency that UE falls back to as required; Through the carrying mechanism of first access network elements, send the preparation request of leaving for preparing to exit first access network elements to first access network elements, this leaves and comprises page-response message in the preparation request.
Step 409 after first access network elements receives and leaves preparation request, is forwarded to 1XCS IWF with leaving the page-response message of carrying in the preparation request.
Whether step 410 after 1XCS IWF receives page-response message, is discerned this 1XCS IWF and is integrated among the 1XRTT BSS in the CDMA 1X network and whether the target carrier frequency of carrying in the initial call message belongs to this 1XRTT BSS.If 1XCS IWF is integrated among the 1XRTT BSS, and the target carrier frequency of carrying in the page-response message belongs to this 1XRTT BSS, then distributes the CDMA 1X traffic channel resource of eating dishes without rice or wine by 1XRTT IWF/BSS to UE.Otherwise; If 1XCS IWF is not integrated among the 1XRTT BSS; The target carrier frequency of perhaps carrying in the initial call message does not belong to this 1XRTT BSS; Then initiate the process of direct-cut operation to 1XRTT MSC, and obtain this 1XRTT BSS to the CDMA 1X of the UE distribution traffic channel resource of eating dishes without rice or wine from 1XRTT BSS to 1XRTT BSS by 1XCS IWF.
Step 411,1XCS IWF sends switch indicating information to first access network elements, and indication UE switches to CDMA 1X network by first network, carries the CDMA1X that distributes to the UE traffic channel resource of eating dishes without rice or wine in this switch indicating information.
Step 412, first access network elements issues the order of leaving of leaving first Access Network to UE, and this leaves the CDMA 1X that carries in the order in the switch indicating information traffic channel resource of eating dishes without rice or wine.
Step 413, UE leaves first Access Network after receiving and leaving order, and catches and leave the CDMA 1X that comprises in the order Traffic Channel of eating dishes without rice or wine, also promptly: insert this CDMA 1X Traffic Channel of eating dishes without rice or wine.Behind the acquisition success, send CS territory voice call service handoff completion message to 1XRTT BSS.
Step 414, after 1XCS BSS received CS territory voice call service handoff completion message, whether identification UE was to switch from other 1XCS BSS to come.If then send CS territory voice call service handoff completion message to 1xRTT MSC; Otherwise, send the voice call service assignment of CS territory to 1XRTT MSC and accomplish message.
Step 415 after 1XRTT MSC receives CS territory voice call service handoff completion message, is initiated reset procedure to 1XCS IWF, removes the relevant information that 1XRTT MSC and 1XCS IWF produce in this CS territory voice call service handoff procedure.
Step 416,1XCS BSS initiates audio call ring process to UE.
Step 417, UE sends to call out to 1XCS BSS and answers order.
Step 418,1XCS BSS receive call out answer order after, return to call out to answer to UE and reply, and answer order to 1XRTT MSC forwarded call.At this moment, CS territory voice call service is set up and is accomplished.
In addition, step 416 also can be carried out with step 415 or carried out prior to step 415 simultaneously.
Step 419, first access network elements is initiated the resource dispose procedure, discharges the UE context resource.
As one embodiment of the present of invention, this step 419 can be carried out any time after step 412, that is: can carry out prior to any step of step 413-418, also can carry out with any step of step 413-418.
According to one embodiment of present invention, among Fig. 5 and the embodiment shown in Figure 6, first network can be the LTE network, and is corresponding, and Access Network is E-UTRAN, and first access network elements comprises eNodeB and MME.According to another embodiment of the invention; First network among Fig. 5 and the embodiment shown in Figure 6 also can be HRPD (High Rate Packet Data; Hereinafter to be referred as: HRPD) network; Accordingly, first access network elements is that (access network is hereinafter to be referred as the network element that AN) comprises for access network.According to still a further embodiment; First network among Fig. 5 and the embodiment shown in Figure 6 can also be micro-wave access global inter communication (Worldwide Interoperability for Microwave Access; Hereinafter to be referred as: WiMAX) network, corresponding, first access network elements comprises base station (base station; Hereinafter to be referred as: BS) with gateway (GateWay, hereinafter to be referred as: GW).In addition, first network also can be the network arbitrarily beyond the CDMA 1X network.Wherein, the BS among the WiMAX is corresponding to the eNodeB in the LTE network, and the GW among the WiMAX is corresponding to the MME in the LTE network.
Fig. 7 is the flow chart of another embodiment of CS drop method of the present invention.Among this embodiment, be that example describes as first network, UE as calling UE, stand good for the situation of first other network of network using with the LTE network.As shown in Figure 7, it may further comprise the steps:
Step 501, UE is attached in the LTE network and be arranged in E-UTRAN, and UE is through eNodeB, MME among the E-UTRAN, and 1X CS IWF carries out the registration of CS territory to 1XRTT MSC.
Step 502 when UE need initiate the CS territory voice call service in the CDMA 1X network, is sent activating business request to MME, comprises in this request of activating business that CS falls after rise to indicate, and expression need be fallen back in the CDMA 1X network.
Step 503, MME sends S1 AP message to eNodeB, wherein carries CS and falls indication after rise, and CDMA 1X network is fallen back in expression UE request.
Step 504, eNodeB request UE reporting measurement reports, each measuring object in the measurement report all comprises following information: the physical district ID of carrier frequency, carrier frequency.
Step 505, eNodeB is according to measurement report, confirms the candidate target carrier frequency in the CDMA 1X network that UE need fall back to, and this candidate target carrier frequency is made up of with physical district ID two parts the carrier frequency numbering, and physical district ID wherein also is a pilot offset.Wherein, the candidate target carrier frequency can be one, also can be a plurality of.
Step 506, eNodeB sends S1 1X parameter request, the expense parameter information of the candidate target carrier frequency that acquisition request UE need fall back to MME.
Step 507 after MME receives S1 1X parameter request, is sent S102 1X parameter request to 1XCS IWF, the candidate target carrier frequency that need fall back to comprising UE.
Step 508,1XCS IWF is through S102 1X parameter response message, and the expense parameter information of the candidate target carrier frequency that UE need be fallen back to sends to MME.
Step 509, MME sends S1 1X parameter to eNodeB and replys, comprising the expense parameter information of candidate target carrier frequency.
As one embodiment of the present of invention; This step 506-step 509 also can be carried out prior to step 504-step 505; Perhaps carrying out simultaneously with step 504-step 505, is the up-to-date expense parameter information of candidate target carrier frequency as long as guarantee through the expense parameter information that step 506-step 509 gets access to.
Step 510 after eNodeB confirms the expense parameter information of candidate target carrier frequency, issues the warning order of leaving for preparing to exit EUTRAN to UE, and this leaves the expense parameter information that comprises the candidate target carrier frequency in the warning order.
Step 511, UE selects a target carrier frequency according to the expense parameter information of the candidate target carrier frequency that issues, and sends the preparation request of leaving for preparing to exit EUTRAN to eNodeB, comprising this UE ID and CDMA 1X initial call message.
Step 512, eNodeB receives after message leaves preparation request, sends up S1 tunnel message to MME, comprising UE ID, CDMA 1X initial call message and this eNode corresponding district ID.
Step 513 after MME receives the S1 tunnel message, is selected 1XCS IWF according to the sub-district ID that carries in the S1 tunnel message, and is transmitted message through S102, with leaving the 1XCS IWF that the CDMA 1X initial call message that carries in the preparation request is forwarded to selection.In addition, S102 transmits in the message and also comprises UE ID.
Whether step 514 after 1XCS IWF receives CDMA 1X initial call message, is discerned this 1XCS IWF and is integrated among the 1XRTT BSS in the CDMA 1X network and whether the target carrier frequency of carrying in the initial call message belongs to this 1XRTT BSS.If 1XCS IWF is integrated among the 1XRTT BSS, and the target carrier frequency of carrying in the CDMA 1X initial call message belongs to this 1XRTT BSS, then distributes the CDMA 1X traffic channel resource of eating dishes without rice or wine by 1XRTT IWF/BSS to UE.Otherwise; If 1XCS IWF is not integrated among the 1XRTT BSS; The target carrier frequency of perhaps carrying in the initial call message does not belong to this 1XRTT BSS; Then initiate the process of direct-cut operation to 1XRTT MSC, and obtain this 1XRTT BSS to the CDMA 1X of the UE distribution traffic channel resource of eating dishes without rice or wine from 1XRTT BSS to 1XRTT BSS by 1XCS IWF.
Step 515,1XCS IWF sends S102 to MME and transmits message, wherein carries switch indicating information, and indication UE switches to CDMA 1X network by the LET network, carries the CDMA 1X that distributes to the UE traffic channel resource of eating dishes without rice or wine in this switch indicating information.
Step 516, MME sends descending S1 tunnel message to eNodeB, wherein carries switch indicating information and the CDMA 1X traffic channel resource of eating dishes without rice or wine.
Step 517 after eNodeB receives descending S1 tunnel message, issues the order of leaving of leaving EUTRAN to UE, wherein carries switch indicating information and the CDMA 1X traffic channel resource of eating dishes without rice or wine.
Step 518 after UE receives and leaves order, is left the LTE network, and catches and leave the CDMA 1X that comprises in the order Traffic Channel of eating dishes without rice or wine.
Step 519, UE catches CDMA 1X and eats dishes without rice or wine after the Traffic Channel success, and the Traffic Channel of will eating dishes without rice or wine through the CDMA1X that catches is sent CS territory voice call service handoff completion message to 1XRTT BSS.
Step 520,1XCS BSS receives whether identification UE is to switch from other 1XCS BSS to come behind the voice call service handoff completion message of CS territory.If then send CS territory voice call service handoff completion message to 1xRTT MSC; Otherwise, then send the voice call service assignment of CS territory and accomplish message to 1XRTT MSC.
Step 521 after 1XRTT MSC receives CS territory voice call service handoff completion message, is initiated reset procedure to 1XCS IWF, removes the relevant information that 1XRTT MSC and 1XCS IWF produce in this CS territory voice call service handoff procedure.
Step 522, eNodeB sends S1 UE context resource to MME and discharges request.
Step 523, MME sends professional hang-up of S1 to S-GW and asks.
Step 524, S-GW hangs up relevant bearer service after receiving the professional hang-up request of S1, and returns the professional hang-up of S1 to MME and reply.
Step 525, MME receive S1 professional hang up reply after, initiate UE context resource dispose procedure to eNodeB, discharge the UE context resource.
As one embodiment of the present of invention, step 522-525 can carry out any time after step 516, that is: can carry out prior to any step of step 517-521, also can carry out with any step of step 517-521.
If UE supports CS drop method of the present invention; Then in the step 501; UE is in the process of adhering to the LTE network; Need (Single Radio Voice Call Continuity be hereinafter to be referred as SRVCC) ability information in the attach request that MME sends, carrying the falling ability information of enhancing through eNodeB or support the wireless voice call continuity.Accordingly, in the step 503, MME corresponding CS that carries enhancing in the S1 AP message that eNodeB sends falls indication after rise or CS falls indication+SRVCC ability information after rise.
Fig. 8 is the flow chart of another embodiment of CS drop method of the present invention.Among this embodiment, be that example describes as first network, UE as called UE, stand good for the situation of first other network of network using with the LTE network.As shown in Figure 8, it may further comprise the steps:
Step 601, UE is attached in the LTE network and be arranged in E-UTRAN, and UE is through eNodeB, MME among the E-UTRAN, and 1X CS IWF carries out the registration of CS territory to 1XRTT MSC.
Step 602,1XRTT MSC sends paging request to 1XCS IWF.
Step 603,1XCS IWF sends CS territory voice paging request to MME.
Step 604, MME sends descending S1 tunnel message to eNodeB, comprising the voice paging request of CS territory.
Step 605, eNodeB sends S102 to UE and transmits message, comprising the voice paging request of CS territory.
Step 606, UE sends the request of activating business to MME, comprises in this request of activating business that CS falls indication after rise, and expression need be fallen back in the CDMA 1X network.
Step 607, MME sends S1 AP message to eNodeB, wherein carries CS and falls indication after rise, and CDMA 1X network is fallen back in expression UE request.
Step 608, eNodeB request UE reporting measurement reports, each measuring object in the measurement report all comprises following information: the physical district ID of carrier frequency, carrier frequency.
Step 609, eNodeB is according to measurement report, confirms the candidate target carrier frequency in the CDMA 1X network that UE need fall back to, and this candidate target carrier frequency is made up of with physical district ID two parts the carrier frequency numbering, and physical district ID wherein also is a pilot offset.Wherein, the candidate target carrier frequency can be one, also can be a plurality of.
Step 610, eNodeB sends S1 1X parameter request, the expense parameter information of the candidate target carrier frequency that acquisition request UE need fall back to MME.
Step 611 after MME receives S1 1X parameter request, is sent S102 1X parameter request to 1XCS IWF, the candidate target carrier frequency that need fall back to comprising UE.
Step 612,1XCS IWF is through S102 1X parameter response message, and the expense parameter information of the candidate target carrier frequency that UE need be fallen back to sends to MME.
Step 613, MME sends S1 1X parameter to eNodeB and replys, comprising the expense parameter information of candidate target carrier frequency.
As one embodiment of the present of invention; This step 610-step 613 also can be carried out prior to step 608-step 609; Perhaps carrying out simultaneously with step 608-step 609, is the up-to-date expense parameter information of candidate target carrier frequency as long as guarantee through the expense parameter information that step 610-step 613 gets access to.
Step 614 after eNodeB confirms the expense parameter information of candidate target carrier frequency, issues the warning order of leaving for preparing to exit EUTRAN to UE, and this leaves the expense parameter information that comprises the candidate target carrier frequency in the warning order.
Step 615, UE selects a target carrier frequency according to the expense parameter information of the candidate target carrier frequency that issues, and sends the preparation request of leaving for preparing to exit EUTRAN to eNodeB, comprising this UE ID and CDMA 1X page-response message.
Step 616, eNodeB receives after message leaves preparation request, sends up S1 tunnel message to MME, comprising UE ID, CDMA 1X page-response message and this eNode corresponding district ID.
Step 617 after MME receives the S1 tunnel message, is selected 1XCS IWF, and is transmitted message through S102, with leaving the 1XCSIWF that the CDMA 1X page-response message of carrying in the preparation request is forwarded to selection.In addition, S102 transmits in the message and also comprises UE ID.
Particularly, MME can adopt following dual mode to select 1XCS IWF:
First kind of mode is: obtain the sub-district ID that carries in the S1 tunnel message, according to sub-district ID that is provided with in advance and the corresponding relation between the 1XCS IWF, choose with page-response message in the corresponding 1XCS IWF of sub-district ID that carries;
The second way is: MME selects to send in the step 603 1XCSIWF of CS territory voice paging request.
Whether step 618 after 1XCS IWF receives CDMA 1X page-response message, is discerned this 1XCS IWF and is integrated among the 1XRTT BSS in the CDMA 1X network and whether the target carrier frequency of carrying in the initial call message belongs to this 1XRTT BSS.If 1XCS IWF is integrated among the 1XRTT BSS, and the target carrier frequency of carrying in the CDMA 1X page-response message belongs to this 1XRTT BSS, then distributes the CDMA 1X traffic channel resource of eating dishes without rice or wine by 1XRTT IWF/BSS to UE.Otherwise; If 1XCS IWF is not integrated among the 1XRTTBSS; The target carrier frequency of perhaps carrying in the initial call message does not belong to this 1XRTT BSS; Then initiate the process of direct-cut operation to 1XRTT MSC, and obtain this 1XRTT BSS to the CDMA 1X of the UE distribution traffic channel resource of eating dishes without rice or wine from 1XRTT BSS to 1XRTT BSS by 1XCSIWF.
Step 619,1XCS IWF sends S102 to MME and transmits message, wherein carries switch indicating information, and indication UE switches to CDMA 1X network by the LET network, carries the CDMA 1X that distributes to the UE traffic channel resource of eating dishes without rice or wine in this switch indicating information.
Step 620, MME sends descending S1 tunnel message to eNodeB, wherein carries switch indicating information and the CDMA 1X traffic channel resource of eating dishes without rice or wine.
Step 621 after eNodeB receives descending S1 tunnel message, issues the order of leaving of leaving EUTRAN to UE, wherein carries switch indicating information and the CDMA 1X traffic channel resource of eating dishes without rice or wine.
Step 622 after UE receives and leaves order, is left the LTE network, and catches and leave the CDMA 1X that comprises in the order Traffic Channel of eating dishes without rice or wine.
Step 623, UE catches CDMA 1X and eats dishes without rice or wine after the Traffic Channel success, and the Traffic Channel of will eating dishes without rice or wine through the CDMA1X that catches is sent CS territory voice call service handoff completion message to 1XRTT BSS.
Step 624, after 1XCS BSS received CS territory voice call service handoff completion message, whether identification UE was to switch from other 1XCS BSS to come.If then send CS territory voice call service handoff completion message to 1xRTT MSC; Otherwise, then send the voice call service assignment of CS territory and accomplish message to 1XRTT MSC.
Step 625 after 1XRTT MSC receives CS territory voice call service handoff completion message, is initiated reset procedure to 1XCS IWF, removes the relevant information that 1XRTT MSC and 1XCS IWF produce in this CS territory voice call service handoff procedure.
Step 626, eNodeB sends the S1UE context resource to MME and discharges request.
Step 627, MME sends professional hang-up of S1 to S-GW and asks.
Step 628, S-GW hangs up bearer service after receiving the professional hang-up request of S1, and returns professional hang-up of S1 to MME and reply.
Step 629, MME receive S1 professional hang up reply after, initiate UE context resource dispose procedure to eNodeB, discharge the UE context resource.
As one embodiment of the present of invention, step 626-629 can carry out any time after step 620, that is: can carry out prior to any step of step 620-625, also can carry out with any step of step 620-625.
If UE supports CS drop method of the present invention; Then in the step 601; UE is in the process of adhering to the LTE network; Need (Single Radio Voice Call Continuity be hereinafter to be referred as SRVCC) ability information in the attach request that MME sends, carrying the falling ability information of enhancing through eNodeB or support the wireless voice call continuity.Accordingly, in the step 607, MME corresponding CS that carries enhancing in the S1 AP message that eNodeB sends falls indication after rise or CS falls indication+SRVCC ability information after rise.
Fig. 9 is the structural representation of an embodiment of access network elements of the present invention, the access network element of this embodiment can be used for realizing embodiment illustrated in fig. 4 in the associative operation of first access network elements.As shown in Figure 9, the access network element of this embodiment comprises receiver module 701, determination module 702, acquisition module 703, sending module 704 and indicating module 705.
Wherein, Receiver module 701 is used to receive the request of activating business that UE sends; Carry CS in this request of activating business and fall indication after rise; This CS falls indication after rise and is used for representing that UE need fall back to second network, receives the second network initial call message or the second ICQ response message that UE sends, and second network that distributes to UE that returns of the IWF traffic channel resource of eating dishes without rice or wine.
The embodiment of the invention also provides a kind of circuit switching fall-back system, and it comprises first network and second network.Wherein, First access network elements in first network receives the request of activating business that user terminal UE sends; Carry circuit switching (CS) in this request of activating business and fall indication after rise; This CS falls indication after rise and is used for representing that UE need fall back to second network; Confirm the target carrier frequency in second network that this UE need fall back to alternately with UE, first access network elements obtains the expense parameter information of target carrier frequency from interworking function entity IWF, and the expense parameter information of this target carrier frequency is sent to UE; First access network elements receives UE according to the expense parameter information structure of target carrier frequency and the second network initial call message or the second ICQ response message that sends; And this second network initial call message or the second ICQ response message be transmitted to IWF, and first access network elements receives second network to UE distributes that IWF returns and eats dishes without rice or wine behind the traffic channel resource, and indication UE falls back to second network from first network.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted last that: above embodiment is only in order to explaining technical scheme of the present invention, but not the present invention is made restrictive sense.Although the present invention is specified with reference to above-mentioned preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and this modification or be equal to spirit and the scope that replacement does not break away from technical scheme of the present invention.
Claims (5)
1. a circuit switching fall-back method is characterized in that, comprising:
First access network elements in first network receives the request of activating business that user terminal UE sends, and carries circuit switching (CS) in this request of activating business and falls indication after rise, and this CS falls indication after rise and is used for representing that UE need fall back to second network;
Target carrier frequency in second network that definite alternately this UE of said first access network elements and said UE need fall back to;
Said first access network elements obtains the expense parameter information of said target carrier frequency from interworking function entity IWF, and the expense parameter information of this target carrier frequency is sent to said UE;
Said first access network elements receives said UE according to the expense parameter information structure of said target carrier frequency and the second network initial call message or the second ICQ response message that sends, and this second network initial call message or the second ICQ response message are transmitted to said IWF;
Second network that distributes to said UE that said first access network elements receives that said IWF the returns traffic channel resource of eating dishes without rice or wine, and indicate said UE to fall back to said second network from said first network.
2. method according to claim 1 is characterized in that, said first network is a Long Term Evolution LTE network, and said first access network elements comprises the base station eNodeB and the mobile management entity MME of evolution;
Perhaps, said first network is a HRPD HRPD network, the network element that said first access network elements comprises for access network AN;
Perhaps, said first network is a micro-wave access global inter communication WiMAX network, and said first access network elements comprises base station BS and gateway GW.
3. method according to claim 1 and 2 is characterized in that, said second network is a code division multiple access CDMA 1X network.
4. an access network elements is characterized in that, said access network elements is first access network elements in first network, and said first access network elements comprises:
Receiver module; Be used to receive the request of activating business that UE sends; Carry CS in this request of activating business and fall indication after rise; This CS falls indication after rise and is used for representing that UE need fall back to second network, receives the second network initial call message or the second ICQ response message that said UE sends, and second network that distributes to said UE that returns of the IWF traffic channel resource of eating dishes without rice or wine;
Determination module is used for confirming alternately with said UE the target carrier frequency of second network that this UE need fall back to;
Acquisition module is used for obtaining from IWF the expense parameter information of said target carrier frequency, and the expense parameter information of this target carrier frequency is sent to said UE;
Sending module; Be used for when said receiver module receives said UE according to the expense parameter information of said target carrier frequency structure and said second network initial call message that sends or the said second ICQ response message, this second network initial call message or the second ICQ response message being transmitted to said IWF;
Indicating module is used for receiving said second network at said receiver module and eats dishes without rice or wine behind the traffic channel resource, indicates said sending module to send Indication message to said UE, and this Indication message is used to indicate said UE to fall back to said second network from said first network.
5. circuit switching fall-back system; Comprise first network and second network; It is characterized in that; First access network elements in said first network is used to receive the request of activating business that UE sends, and carries CS in this request of activating business and falls indication after rise, and this CS falls indication after rise and is used for representing that UE need fall back to second network; Confirm the target carrier frequency in second network that this UE need fall back to alternately with said UE; Obtain the expense parameter information of said target carrier frequency from IWF, and the expense parameter information of this target carrier frequency is sent to said UE; Receive said UE according to the expense parameter information structure of said target carrier frequency and the second network initial call message or the second ICQ response message that sends, and this second network initial call message or the second ICQ response message are transmitted to said IWF; Second network that distributes to said UE that receives that said IWF the returns traffic channel resource of eating dishes without rice or wine, and indicate said UE to fall back to said second network from said first network.
Priority Applications (2)
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| CN200910086113A CN101909342B (en) | 2009-06-02 | 2009-06-02 | Method and system for circuit switching fall-back and access network elements |
| PCT/CN2010/072089 WO2010139213A1 (en) | 2009-06-02 | 2010-04-23 | Method and system for circuit switched fallback, and net element of access network |
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| CN200910086113A CN101909342B (en) | 2009-06-02 | 2009-06-02 | Method and system for circuit switching fall-back and access network elements |
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| CN101909342B true CN101909342B (en) | 2012-09-05 |
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| US9042215B2 (en) * | 2011-04-05 | 2015-05-26 | Qualcomm Incorporated | Simultaneous acquisition of a TD-SCDMA network in circuit-switched fallback from TDD-LTE systems |
| CN102177737A (en) * | 2011-04-19 | 2011-09-07 | 华为技术有限公司 | Method and system for processing circuit switched fallback service, mobility management entity and user equipment |
| CN102790987B (en) * | 2011-05-18 | 2016-07-06 | 中兴通讯股份有限公司 | A kind of method supporting multi-carrier frequency to access and BTS and access terminal |
| CN103081535A (en) * | 2011-08-24 | 2013-05-01 | 华为技术有限公司 | Circuit-switched fallback processing method, device and system |
| CN103313426B (en) * | 2012-03-16 | 2016-08-10 | 华为技术有限公司 | The instruction of signaling connection establishment reason and recognition methods and device |
| CN103002531B (en) * | 2012-12-17 | 2016-01-13 | 东莞宇龙通信科技有限公司 | Multi-mode single-standby mobile terminal and communication means |
| CN103068010A (en) * | 2012-12-26 | 2013-04-24 | 华为技术有限公司 | Selection method and device of target area |
| CN105025536A (en) * | 2014-04-29 | 2015-11-04 | 中国电信股份有限公司 | Long term evolution (LTE) to evolution high-rate packet data (eHRPD) switching method, LTE to eHRPD system, terminal and evolved node B (eNB) |
| CN105050147B (en) * | 2015-06-30 | 2020-12-11 | 中兴通讯股份有限公司 | Method and device for voice fallback in switching process |
| CN105472680A (en) * | 2015-11-17 | 2016-04-06 | 中科创达软件股份有限公司 | Voice call method and voice call system for mobile terminal |
| WO2017113118A1 (en) * | 2015-12-29 | 2017-07-06 | 华为技术有限公司 | Service fallback method and apparatus, and communication system |
| CN108307454B (en) * | 2016-08-30 | 2022-03-25 | 中兴通讯股份有限公司 | Network switching method and device |
| CN110505687B (en) * | 2018-05-17 | 2022-03-29 | 大唐移动通信设备有限公司 | Paging message response method, device, terminal, network side equipment and medium |
| CN115250441B (en) * | 2021-04-28 | 2023-08-15 | 中国移动通信集团河北有限公司 | Method, device, equipment and medium for determining voice fallback delay information |
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