CN106993318A

CN106993318A - The method that switches between network, device, eMSC and SCC AS

Info

Publication number: CN106993318A
Application number: CN201610038650.4A
Authority: CN
Inventors: 李振东; 杨维; 刘竞翔
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-01-20
Filing date: 2016-01-20
Publication date: 2017-07-28
Also published as: WO2017124975A1

Abstract

The invention provides a kind of method switched between network, device, eMSC and SCC AS, wherein, this method includes：When determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Continue to carry out exhaling processing eventually based on the visited network after switching, pass through the present invention, when solving in correlation technique callee side and being in state before ringing-state or ring, carry out SRVCC switchings, can switch failure the problem of, and then reached eventually exhale do not support state before ringing-state or ring when SRVCC switching in the case of, can also be successfully established the effect of calling.

Description

The method that switches between network, device, eMSC and SCC AS

Technical field

The present invention relates to the communications field, in particular to a kind of method switched between network, device, eMSC and SCC AS.

Background technology

Network interconnection agreement (Internet Protocol, abbreviation IP) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, abbreviation IMS) it is by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) propose a kind of IP-based network architecture, construct one opening and flexible service environment, multimedia application is supported, abundant multimedia service can be provided the user.

In IMS business systems, key-course and operation layer are separation, and key-course does not provide specific business, only provide the functions such as necessary triggering, route, charging to operation layer.

Business is triggered in key-course and control function is what CSCF (Call Session Control Function, abbreviation CSCF) was completed.CSCF is divided into：Proxy Call Session Control Function (Proxy-CSCF, abbreviation P-CSCF), query call conversation control function (Interrogating-CSCF, abbreviation I-CSCF) and service call conversation control function (Serving-CSCF, abbreviation S-CSCF) three types.

Operation layer is made up of a series of application servers (Application Server, abbreviation AS), can provide specific business service, AS can be independent entity, can also be present in S-CSCF.

Key-course (S-CSCF) is triggered according to the signing information control business of user, is called the business on AS, is realized business function.

End-to-end equipment in session is referred to as user equipment (User Equipment, abbreviation UE), it is responsible for interacting with user, some UE have the mode of a variety of access networks, including packet switch (Packet Switch, abbreviation PS) domain access network by 3GPP, pass through the ps domain access network of other non-3 gpp, circuit switching (Circuit Switch, abbreviation CS) domain access network etc. even can be passed through.

For the UE with plurality of access modes, if the UE moment can only use a kind of access way, then it is carrying out a certain business under a kind of access way, such as, call, when UE be moved to elsewhere and need change its use access way when, the business that UE and network can provide certain mode and be carrying out UE is not disrupted, we term it single-mode terminal business continuance for such ability, abbreviation single radio voice call continuity (Single Radio Voice Call Continuity, abbreviation SRVCC).3GPP defines SRVCC framework and flow.In order to reduce the delay in handoff procedure, 3GPP then defines enhanced SRVCC (enhanced SRVCC, abbreviation eSRVCC).

The problem of being solved due to this patent while be present in SRVCC and eSRVCC, and this patent solution be with eSRVCC for SRVCC as.During for simplicity, in addition to specified otherwise, SRVCC described below refers to above-mentioned SRVCC and eSRVCC simultaneously.

Fig. 1 is the configuration diagram of eSRVCC in correlation technique, as shown in figure 1, user equipment (UE) 101 begins through source wireless access network 111 (Source Radio Aceess Network, abbreviation Source RAN) access PS access networks 103.The source wireless access network can be Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, abbreviation UMTS), can also be the UMTS wireless access networks (Evolved UMTS Terrestrial Radio Access Network, abbreviation E-UTRAN) of evolution.The critical entities of PS access networks are mobility management entity (Mobility Management Entity, abbreviation MME) or GPRS service nodes (Serving GPRS Support Node, abbreviation SGSN).

UE101 when Source RAN are accessed, IMS voip conversations can be anchored on business unanimously with continuous server (Service Centralization and Continuity Application Server, abbreviation SCC AS).Session connects distal end by IMS network.

When Source RAN poor signal, SRVCC switchings can be triggered.Source RAN can configure wireless signal threshold value, when less than the threshold value, trigger SRVCC, and UE is switched to CS access networks 110, is connected to mobile switching centre (Mobile Switching Center, abbreviation MSC109), MSC is connected to anchor point SCC AS again.For flexible deployment, MSC109 can be made up of two MSC, enhanced MSC (enhanced MSC for SRVCC) and Serving MSC.EMSC initiates to switch as anchor point to IMS network.EMSC reserves resource by Serving MSC in CS access networks, and UE101 is accessed into Serving MSC by CS access networks.As only one of which MSC, MSC is simultaneously eMSC and Serving MSC.

Also VLR Visitor Location Register (Visitor Location Register, abbreviation VLR) simultaneously on Serving MSC, is referred to as Serving MSC in following statement, not difference both.

When there is eSRVCC, session can also be anchored on access transfer control function (Access Transfer Control Function simultaneously, abbreviation ATCF) and access transfer gateway 105 (Access Transfer Gateway, abbreviation ATGW), UE to SCC AS session, by UE to ATCF, and ATCF to SCC AS two sections of sessions composition.After SRVCC switchings, UE to SCC AS session is changed into UE---Serving MSC---eMSC---ATCF/ATGW---SCC-AS compositions.

Home subscribed services device (Home Subscriber Server, abbreviation HSS), attaching position register (Home Location Register, abbreviation HLR) saves the signing information of user.It is described as HSS/HLR, either HSS or HLR, is not distinguished hereafter.

SRVCC not only supports session SRVCC in call, also supports the switching of state (pre-alerting) session before ringing-state (alerting) session and the ring of Calling Side.Fig. 2 is to exhale side SRVCC in correlation technique eventually, altering SRVCC and pre-alerting SRVCC timing definition schematic diagram, as shown in Fig. 2

Session SRVCC refers in so-called call, and UE connects with distal end and called, and converses, and whether this there occurs that SRVCC switches.

Alerting SRVCC refer to that UE not yet connects phone with distal end, and UE can hear ring back tone in Calling Side, if UE is in callee side, start ring.

Pre-laerting SRVCC refer to that UE not yet connects phone with distal end, and Calling Side can not still hear ring back tone, and callee side does not start to ring yet.

Fig. 3 is to exhale side in correlation technique eventually, the flow chart of the single radio voice call continuity switching of ringing-state session, as shown in figure 3, the flow comprises the following steps：

Step S301：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S302：Called UE sends 180 ALERTING messages (intermediate steps omission) to distal end；

Step S303：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and hair handover request is to MME/SGSN；

Step S304：The bearer that MME/SGSN has found UE and has QCI=1 is carried；

Step S305：MME/SGSN sends PS to CS handover requests to eMSC；

Step S306：EMSC reserves resource to target radio access network (Target RAN) RNC/BSS；This process is probably that eMSC determines target Serving MSC, is completed by Serving MSC.

Step S307：EMSC sends switching request response to MME, and expression can switch；

Step S308：MME sends switching command by source wireless access network to UE；

Step S308a：UE is switched to CS access networks, and continues ring；

Step S309：MSC initiates session handover request to the anchor point SCC AS of session；

Note：Step S307 and step S309 can be parallel.

Step S309a：SCC AS update distal end, now call also in ringing-state；

Step S310：SCC AS notify eMSC, and UE is at present in ringing-state；

Step S311：User's off-hook is answered the call；

Step S312：UE sends out Connect message to eMSC；

Step S312b：On eMCS, session becomes activated state；

Step S313：EMSC sends call state to SCC AS and notifies (call notification), and user connects phone；

Step S314：SCC AS update distal end.

As in above-mentioned correlation technique, when session status is pre-alerting, the switching of Calling Side is only supported.For callee side, network or terminal do not support SRVCC during pre-alerting to switch, if occurring SRVCC switchings in pre-alerting states in called UE, it may occur that handoff failure.

In addition, if terminal called does not support alerting SRVCC states switching (only supporting that SRVCC switches in call) in itself, even if network support alerting SRVCC, switching can also fail.After current SRVCC switchings, CS conversation ends, UE can return to LTE network.The UE is at this time called again, can still be switched unsuccessfully, in some cases, causes user can not successfully receive calling.

Fig. 4 is to exhale UE eventually in pre-alerting or alerting states in correlation technique, the flow chart of handoff failure, as shown in figure 4, user, which has been absorbed in, can not receive the situation of calling.

Step S401：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S402：Called UE sends 183 message to distal end.(media information of exchange session)；

Step S403：In Source PS access networks, QCI=1 bearer is generated；

Step S404：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and sends out handover request.Step S303~308 of the step with Fig. 3 herein；

Step S405：UE is switched to behind CS domains, is initiated in pre-alerting states, it is believed that handoff failure.

Step S406：UE sends out Disconnect message to eMSC；

Step S407：EMSC in step s 404, while to MME hair switching responses, session transfer is initiated to SCC AS.Because SCC AS do not support pre-alerting to switch, SCC is notified that eMSC handoff failures.

Step S408：Whole handoff failure；When called UE does not support alerting in itself, process is similar with upper figure.Although step S407 can succeed, UE is after step S406 sends Disconnect, and eMSC discharges calling then to SCC AS.

Step S409：UE returns to Source RAN

Step S410：When UE is not moved, signal coverage condition does not change.Now, calling is received again by, can repeat step S401~409.

As can be seen that called user terminal does not support the SRVCC of pre-alerting or alerting states to switch from above-mentioned correlation technique.One method is that upgrading UE goes to support the switching of these states.However, above-mentioned upgrading terminals scheme is extremely difficult, even if new terminal supports the switching of these states, still there is this in the UE produced.Another method be MME under pre-alerting/alerting, do not initiate switching for called, but MME does not understand IMS layers of state, it is impossible to limit the generation of this switching.

Therefore, in the related art, when callee side is in state before ringing-state or ring, SRVCC switchings are carried out, it may occur that the problem of handoff failure.

The content of the invention

The invention provides the processing method switched between a kind of network, device, eMSC and SCC AS, when at least solving that callee side is in state before ringing-state or ring in correlation technique, to carry out SRVCC switchings, it may occur that the problem of handoff failure.

According to an aspect of the invention, there is provided the processing method switched between a kind of network, including：When determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Continue to carry out exhaling processing eventually based on the visited network after switching.

Preferably, when determining that the terminal called is in state before ringing condition or ring, the SRVCC handoff failures include：The terminal status message that business is unanimously sent with continuous server SCC AS is received, and/or, receive the first connection failure message that the terminal called is sent；According to the terminal status message and/or the first connection failure message, the SRVCC handoff failures are determined.

Preferably, the terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that the terminal called is in state before ringing condition or ring.

Preferably, when it is determined that the terminal called is in state before ringing condition or ring, before the SRVCC handoff failures, in addition to：Determine that being used for the end after network switching exhales the destination service mobile switching centre S-MSC of processing.

Preferably, determine after network switching to exhale the target S-MSC of processing to include for the end：Receive the first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent, wherein, the identification information of the MSC for identifying the terminal called registration is carried in the first network handover request message；The MSC for determining the identification information mark is the target S-MSC.

Preferably, continue to carry out exhaling processing to include at least one of eventually based on the visited network after switching：By the target S-MSC of determination, the first session establishment request message for setting up session is sent to the terminal called；And/or, terminal roaming number is inquired about from the target S-MSC according to attaching position register HLR, or directly inquire about the terminal roaming number from the target S-MSC；The terminal roaming number according to inquiry sends the second session establishment request message for setting up session to the terminal called.

Preferably, the first session establishment request message is Setup message, or, the second session establishment request message is initial address message IAM message.

Preferably, before the visited network after continuing based on switching carries out exhaling processing eventually, in addition to：The second connection failure message is sent to the terminal called.

According to another aspect of the present invention there is provided the processing method switched between a kind of network, including：Receive the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；According to the second network switching request message, the terminal status message of terminal called is sent to the eMSC, wherein, the terminal status message, which is used for the eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.

Preferably, when the second network switching request message is additionally operable to indicate that the eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings；Or, the terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that the terminal called is in state before ringing condition or ring.

According to an aspect of the present invention there is provided the processing method switched between a kind of network, including：Store the moving exchanging center MSC of terminal called registration；The 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying the terminal called registration is carried in the 3rd network switching request message.

Preferably, the identification information is used for the eMSC in state before the terminal called is in ringing condition or ring, before single radio voice call continuity SRVCC handoff failures, determines the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

According to an aspect of the present invention there is provided the processing unit switched between a kind of network, including：First determining module, during for determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Processing module, for continuing based on switching after visited network carry out eventually exhale processing.

Preferably, first determining module includes：First receiving unit, for receiving the terminal status message that business is unanimously sent with continuous server SCC AS, and/or, receive the first connection failure message that the terminal called is sent；First determining unit, for according to the terminal status message and/or the first connection failure message, determining the SRVCC handoff failures.

Preferably, the device also includes：Second determining module, for determining that being used for the end after network switching exhales the destination service mobile switching centre S-MSC of processing.

Preferably, second determining module includes：Second receiving unit, for receiving the first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent, wherein, the identification information of the MSC for identifying the terminal called registration is carried in the first network handover request message；Second determining unit, for determining that the MSC of the identification information mark is the target S-MSC.

Preferably, the processing module includes at least one of：First transmitting element, for the target S-MSC by determination, the first session establishment request message for setting up session is sent to the terminal called；And/or, the second transmitting element for inquiring about terminal roaming number from the target S-MSC according to attaching position register HLR, or directly inquires about the terminal roaming number from the target S-MSC；The terminal roaming number according to inquiry sends the second session establishment request message for setting up session to the terminal called.

Preferably, the device also includes：First sending module, for sending the second connection failure message to the terminal called.

According to the further aspect of the present invention, there is provided a kind of enhanced mobile switching centre eMSC, including the device described in any of the above-described.

According to the present invention further aspect there is provided a kind of eMSC, the eMSC and serving mobile switching center S-MSC be same MSC.

According to an aspect of the present invention there is provided the processing unit switched between a kind of network, including：Receiving module, for receiving the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；Second sending module, for according to the second network switching request message, the terminal status message of terminal called to be sent to the eMSC, wherein, the terminal status message, which is used for the eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.

According to another aspect of the present invention there is provided a kind of business unanimously with continuous server SCC AS, including device described above.

According to an aspect of the present invention there is provided the processing unit switched between a kind of network, including：Memory module, the moving exchanging center MSC for storing terminal called registration；3rd sending module, for the 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying the terminal called registration is carried in the 3rd network switching request message.

According to another aspect of the present invention there is provided a kind of mobile management entity MME, including device described above.

There is provided a kind of GPRS service nodes SGSN, including device described above according to another aspect of the present invention.

Pass through the present invention, during using determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Continue to carry out exhaling processing eventually based on the visited network after switching, when solving in correlation technique callee side and being in state before ringing-state or ring, carry out SRVCC switchings, can switch failure the problem of, and then reached eventually exhale do not support state before ringing-state or ring when SRVCC switching in the case of, can also be successfully established the effect of calling.

Brief description of the drawings

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and schematic description and description of the invention is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：

Fig. 1 is the configuration diagram of eSRVCC in correlation technique；

Fig. 2 is to exhale side SRVCC, altering SRVCC and pre-alerting SRVCC timing definition schematic diagram eventually in correlation technique；

Fig. 3 is to exhale side in correlation technique eventually, the flow chart of the single radio voice call continuity switching of ringing-state session；

Fig. 4 is to exhale UE eventually in pre-alerting or alerting states in correlation technique, the flow chart of handoff failure；

Fig. 5 is the flow chart of the processing method one switched between network according to embodiments of the present invention；

Fig. 6 is the flow chart of the processing method two switched between network according to embodiments of the present invention；

Fig. 7 is the flow chart of the processing method three switched between network according to embodiments of the present invention；

Fig. 8 is the flow chart one for exhaling side pre-alerting SRVCC ends according to embodiments of the present invention；

Fig. 9 is the flowchart 2 for exhaling side pre-alerting SRVCC at end according to embodiments of the present invention；

Figure 10 is the flow chart 3 for exhaling side pre-alerting SRVCC at end according to embodiments of the present invention；

Figure 11 is the flow chart that UE according to embodiments of the present invention initiates joint attaching process in EPC；

Figure 12 is the flow chart of the optimal way according to embodiments of the present invention to embodiment illustrated in fig. 8；

Figure 13 is to correspond to embodiment illustrated in fig. 8 according to embodiments of the present invention to be under alerting states in UE, occurs SRVCC, and UE does not support the flow chart in the case of alerting SRVCC；

Figure 14 is that the embodiment illustrated in fig. 9 that corresponds to according to embodiments of the present invention is under alerting states in UE, just occurs SRVCC, and UE does not support the flow chart in the case of alerting SRVCC；

Figure 15 is the structured flowchart of the processing unit one switched between network according to embodiments of the present invention；

Figure 16 is the structured flowchart of the first determining module 152 in the processing unit switched between network according to embodiments of the present invention；

Figure 17 is the preferred structure block diagram one of the processing unit one switched between network according to embodiments of the present invention；

Figure 18 is the structured flowchart of the second determining module 172 in the processing unit switched between network according to embodiments of the present invention；

Figure 19 is the structured flowchart of processing module 154 in the processing unit switched between network according to embodiments of the present invention；

Figure 20 is the preferred structure block diagram two of the processing unit one switched between network according to embodiments of the present invention；

Figure 21 is a kind of enhanced mobile switching centre eMSC according to embodiments of the present invention structural representation；

Figure 22 is the structured flowchart of the processing unit two switched between network according to embodiments of the present invention；

Figure 23 is the structural representation of business according to embodiments of the present invention unanimously with continuous server SCC AS；

Figure 24 is the structured flowchart of the processing unit three switched between network according to embodiments of the present invention；

Figure 25 is the structured flowchart of mobile management entity MME according to embodiments of the present invention；

Figure 26 is GPRS service nodes SGSN according to embodiments of the present invention structured flowchart.

Embodiment

Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.

It should be noted that term " first ", " second " in description and claims of this specification and above-mentioned accompanying drawing etc. is for distinguishing similar object, without for describing specific order or precedence.

Provide the processing method that switches between a kind of network in the present embodiment, Fig. 5 is the flow chart of the processing method one switched between network according to embodiments of the present invention, as shown in figure 5, the flow comprises the following steps：

Step S502, when determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；

Step S504, continues to carry out exhaling processing eventually based on the visited network after switching.

Pass through above-mentioned steps, when it is determined that callee side does not support the SRVCC switchings of state before ringing condition or ring, continue to carry out exhaling processing eventually based on the visited network after switching, relative in correlation technique, in the SRVCC switchings of state before callee side does not support ringing condition or ring, for calling progress is abandoned causing terminal can not receive calling, carry out exhaling processing eventually based on visited network using continuation, not only efficiently solve in correlation technique, when callee side is in state before ringing-state or ring, carry out SRVCC switchings, can switch failure the problem of, and then reached eventually exhale do not support state before ringing-state or ring when SRVCC switching in the case of, also calling can be successfully established, effectively improve the effect of the efficiency of access success foundation.

When it is determined that terminal called is in state before ringing condition or ring, SRVCC handoff failures can be carried out from many aspects, for example, receiving the terminal status message that business is unanimously sent with continuous server SCC AS, and/or, receive the first connection failure message of terminal called transmission；According to terminal status message and/or the first connection failure message, SRVCC handoff failures are determined.The terminal status message indicates that terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that terminal called is in state before ringing condition or ring., wherein it is desired to which explanation, above-mentioned terminal status message can only include the status information for being used to indicate terminal status, for example, when terminal is in state before ring, then can directly determine that the terminal does not support SRVCC to switch；Certain terminal status message can also not only include the status information for terminal status, in addition to directly show the ability information whether terminal supports SRVCC to switch.The terminal status message is used to determine not supporting SRVCC switchings to use various ways when terminal called is in state before ringing condition or ring, such as, in the competence set that the terminal called is supported, do not show that the terminal called is supported not support SRVCC to switch during the state before ringing condition or ring；Pass through above-mentioned message, it may be determined that terminal called does not support the SRVCC switchings during state before ringing condition or ring.

Preferably, when it is determined that terminal called is in state before ringing condition or ring, before SRVCC handoff failures, the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching can also be determined.It should be noted that when be in different scenes under, determine this be used for eventually exhale processing target S-MSC mode it is also different, for example, when MME and/or SGSN do not store terminal called register MSC in the case of, by eMSC determines target S-MSC by source S-MSC；And when MME and/or SGSN be stored with terminal called registration MSC in the case of, determine after network switching be used for eventually exhale the target S-MSC of processing to include：The first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent is received, wherein, the identification information of the MSC for identifying terminal called registration is carried in first network handover request message；Afterwards, the MSC for determining identification information mark is target S-MSC.

It is used for the target S-MSC mode difference for exhaling processing eventually based on above-mentioned determination, continues exhale eventually the mode of processing can also be different based on the visited network after switching, for example, at least one of can be included：Directly by the target S-MSC of determination, the first session establishment request message for setting up session is sent to terminal called, for example, the first session establishment request message can be Setup message；And/or, terminal roaming number first is inquired about from target S-MSC according to attaching position register HLR, or directly inquire about terminal roaming number from target S-MSC；Afterwards, the terminal roaming number of foundation inquiry sends the second session establishment request message for setting up session to terminal called, for example, the second session establishment request message can be initial address message IAM message, S-MSC continues to send Setup message to UE after IAM message is received.

It should be noted that sending the second connection failure message before the visited network after continuing based on switching carries out exhaling processing eventually, in addition to terminal called.By sending the second connection failure message to terminal called so that existing session status before terminal called is effectively removed.

Fig. 6 is the flow chart of the processing method two switched between network according to embodiments of the present invention, as shown in fig. 6, the flow comprises the following steps：

Step S602, receives the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；

Step S640, according to the second network switching request message, the terminal status message of terminal called is sent to eMSC, wherein, terminal status message, which is used for eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.Terminal status message indicates that terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that terminal called is in state before ringing condition or ring.It should be noted that the terminal status message can only include the status information for being used to indicate terminal status, for example, when terminal is in state before ring, then can directly determine that the terminal does not support SRVCC to switch；Certain terminal status message can also not only include the status information for terminal status, in addition to directly show the ability information whether terminal supports SRVCC to switch.I.e. the terminal status message is used to determine not support SRVCC to switch when terminal called is in state before ringing condition or ring.

Pass through above-mentioned steps, by the terminal status message that terminal called is sent to eMSC, when it is determined that callee side does not support the SRVCC switchings of state before ringing condition or ring, continue to carry out exhaling processing eventually based on the visited network after switching, relative in correlation technique, in the SRVCC switchings of state before callee side does not support ringing condition or ring, for calling progress is abandoned causing terminal can not receive calling, carry out exhaling processing eventually based on visited network using continuation, not only efficiently solve in correlation technique, when callee side is in state before ringing-state or ring, carry out SRVCC switchings, can switch failure the problem of, and then reached eventually exhale do not support state before ringing-state or ring when SRVCC switching in the case of, also calling can be successfully established, effectively improve the effect of the efficiency of access success foundation.

It should be noted that when above-mentioned second network switching request message is additionally operable to indicate that eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings.

Fig. 7 is the flow chart of the processing method three switched between network according to embodiments of the present invention, as shown in fig. 7, the flow comprises the following steps：

Step S702, the moving exchanging center MSC of storage terminal called registration；

Step S704, the 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying terminal called registration is carried in the 3rd network switching request message.Preferably, the identification information is used for eMSC in state before terminal called is in ringing condition or ring, before single radio voice call continuity SRVCC handoff failures, determines the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

Pass through above-mentioned steps, when MSC according to storage determines that terminal called is in state before ringing condition or ring, after SRVCC handoff failures, and the destination service mobile switching centre S-MSC of processing is exhaled after network switching for end, and when it is determined that callee side does not support the SRVCC switchings of state before ringing condition or ring, continue to carry out exhaling processing eventually based on the visited network after switching, relative in correlation technique, in the SRVCC switchings of state before callee side does not support ringing condition or ring, for calling progress is abandoned causing terminal can not receive calling, carry out exhaling processing eventually based on visited network using continuation, not only efficiently solve in correlation technique, when callee side is in state before ringing-state or ring, carry out SRVCC switchings, can switch failure the problem of, and then reached eventually exhale do not support state before ringing-state or ring when SRVCC switching in the case of, also calling can be successfully established, effectively improve the effect of the efficiency of access success foundation.

To overcome the shortcomings of in correlation technique, in embodiments of the present invention there is provided one kind when exhaling UE due to not supporting that pre-laerting/alerting SRVCC switch eventually, occur after SRVCC switchings, can still be successfully established the method for calling.In the present embodiment, side is being exhaled eventually, when SCC AS are the discovery that per-alerting SRVCC switchings, do not discharge eMSC sessions.EMSC is received from SCC AS after the state of user (pre-alerting/alerting), and/or receives UE disConnect message, it is known that handoff failure, continues to complete to call in CS domains.

The preferred embodiment for the present invention is illustrated below in conjunction with accompanying drawing.

Fig. 8 is the flow chart one for exhaling side pre-alerting SRVCC ends according to embodiments of the present invention, as shown in figure 8, the flow comprises the following steps：

Step S801：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S802：Called UE sends 183 message to distal end；

Step S803：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and hair handover request is to MME/SGSN；

Step S804：The bearer that MME/SGSN has found UE and has QCI=1 is carried；

Step S805：MME/SGSN sends PS to CS handover requests to eMSC；

Step S806：EMSC reserves resource to target radio access network (Target RAN) RNC/BSS；This process is probably that eMSC determines target Serving MSC, is completed by Serving MSC.

Step S807：EMSC sends switching request response to MME, and expression can switch；

Step S808：MME sends switching command by source wireless access network to UE；

Step S809：UE is switched to CS domains, and discovery does not support pre-alerting to switch；

Step S810：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC；It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC.

Step S811：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale Pre-alerting SRVCC eventually；

Note：Step S811 and step S807 is parallel, without orbution.

Step S812：SCC AS update distal end；

Step S813：SCC AS notify eMSC, and UE is at present in pre-alerting states；

Step S814：EMSC sends Setup to UE.The message reaches UE by Serving MSC；

Step S815：When user answers, UE sends Connect message.The message reaches eMSC by Serving MSC.

Note：EMSC and S-MSC can be same MSC.

Fig. 9 is the flowchart 2 for exhaling side pre-alerting SRVCC at end according to embodiments of the present invention, as shown in figure 9, the flow comprises the following steps：

Step S901：In Pre-alerting states SRVCC switchings occur for callee side user.Step is with step S801~808 in above-mentioned Fig. 8；

Step S902：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale Pre-alerting SRVCC eventually；

Step S903：SCC AS update distal end；

Step S904：SCC AS notify eMSC, and UE is at present in pre-alerting states；

Step S905：UE is switched to CS domains, and discovery does not support pre-alerting to switch；

Note：As Fig. 8, there is no orbution between step S902 and step S905.

Step S906：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC；It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC.

Step S907：EMSC discharges the session between UE；

Step S908：EMSC sends routing inquiry request (Sending Routing Information, referred to as SRI) to HLR；

Step S609：HLR inquires about roaming number (Provide Roaming Number, referred to as PRN) to Serving MSC, and MSC returns to terminal routing number (MS Routing Number, referred to as MSRN) to HLR；

Step S910：HLR returns to routing number to eMSC；

Step S911：EMSC sends IAM message to Serving MSC；

Step S912：Serving MSC send Setup message to UE；

Step S913：When user answers, UE sends Connect message and gives Serving MSC.

Note：EMSC and S-MSC can be same MSC, now become Fig. 8 scheme.

Figure 10 is the flow chart 3 for exhaling side pre-alerting SRVCC at end according to embodiments of the present invention, as shown in Figure 10, and the flow comprises the following steps, in the present embodiment, and eMSC directly asks roaming number to Serving MSC.

Step S1001：In Pre-alerting states SRVCC switchings occur for callee side user.Step is with Fig. 8 steps S801~808；

Step S1002：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale Pre-alerting SRVCC eventually；

Step S1003：SCC AS update distal end；

Step S1004：SCC AS notify eMSC, and UE is at present in pre-alerting states；

Step S1005：UE is switched to CS domains, and discovery does not support pre-alerting to switch；

Note：As Fig. 8, there is no orbution between step S1002 and step S1005.

Step S1006：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC.It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC；

Step S1008：EMSC discharges the session between UE；

Step S1009：EMSC inquires about roaming number (Provide Roaming Number, referred to as PRN) to Serving MSC, and Serving MSC return to terminal routing number (MS Routing Number, referred to as MSRN) to eMSC；

Step S1010：EMSC sends IAM message to Serving MSC；

Step S1011：Serving MSC send Setup message to UE；

Step S1012：When user answers, UE sends Connect message and gives Serving MSC.

Note：EMSC and S-MSC can be same MSC, now become Fig. 8 scheme.

It should be noted that UE is when EPC adheres to, combined registering renewal can be initiated, Figure 11 is the flow chart that UE according to embodiments of the present invention initiates joint attaching process in EPC, as shown in figure 11.Combined registering renewal after, MME its replace user's registration MSC information.

Step S1101：UE initiates attach requests to MME, it is desirable to be combined attach；

Step S1102：MME initiates attach processes to EPC；

Step S1103：MME updates request (Location Area Update, abbreviation LAU) to MSC launch positions；

Step S1104:The SGs interfaces that MSC is set up between MME；

Step S1105：MSC and HSS/HLR completes the Location Update processes in CS domains, obtains user contracting data；

Step S1106：MSC sends LAU to MME and receives response.

Now, MME can preserve MSC information.

As the optimal way of above-described embodiment, MME can select the MSC preserved to be sent to eMSC in handover request as eMSC, or by the MSC information of preservation in handoff procedure.The former does not have an impact to above-mentioned flow, unifies equivalent to eMSC and Serving MSC.For the latter, eMSC can select the MSC received as Serving MSC.It is exemplified below.

Figure 12 is the flow chart of the optimal way according to embodiments of the present invention to embodiment illustrated in fig. 8, and as shown in figure 12, the flow comprises the following steps：

Step S1200：UE does joint attachment update in EPC, and MME saves the MSC2 information of registration；

Step S1201：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S1202：Called UE sends 183 message to distal end；

Step S1203：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and hair handover request is to MME/SGSN；

Step S1204：The bearer that MME/SGSN has found UE and has QCI=1 is carried；

Step S1205：MME/SGSN sends PS to CS handover requests to eMSC, wherein carrying MSC2 information；

Step S1206：EMSC reserves resource to target radio access network (Target RAN) RNC/BSS；This process is probably that eMSC determines that MSC2, as target Serving MSC, is completed by Serving MSC.

Step S1207：EMSC sends switching request response to MME, and expression can switch；

Step S1208：MME sends switching command by source wireless access network to UE；

Step S1209：UE is switched to CS domains, and discovery does not support pre-alerting to switch；

Step S1210：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC.It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC；

Step S1211：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale Pre-alerting SRVCC eventually；

Note：Step S1211 and 1207 can be parallel, without orbution.

Step S1212：SCC AS update distal end；

Step S1213：SCC AS notify eMSC, and UE is at present in pre-alerting states；

Step S1214：EMSC sends Setup to UE.The message reaches UE by Serving MSC；

Step S1215：When user answers, UE sends Connect message.The message reaches eMSC by Serving MSC.

Note：EMSC and S-MSC can be same MSC.

Above-mentioned is the optimal way to Fig. 8 embodiments.For embodiment illustrated in fig. 9, embodiment illustrated in fig. 10, it would however also be possible to employ this optimal way, MME preserves the MSC information of registration when joint is adhered to.In Fig. 9 step S901, Figure 10 step S1001, when MME initiates PS to CS handover requests to eMSC, the MSC information preserved is carried.EMSC to target radio access network (Target RAN) RNC/BSS when reserving resource, and eMSC is using the MSC received as Serving MSC, and remaining step is just as.

It should be noted that above-described embodiment and preferred embodiment, are all the scenes that UE does not support pre-alerting SRVCC.When UE only supports SRVCC in call, without supporting that aforesaid way can be also applicable during alerting SRVCC.

Figure 13 is to correspond to embodiment illustrated in fig. 8 according to embodiments of the present invention to be under alerting states in UE, occurs SRVCC, and UE does not support the flow chart in the case of alerting SRVCC, and as shown in figure 13, the flow comprises the following steps：

Step S1300：Optionally, UE does joint attachment update in EPC, and MME saves the MSC2 information of registration；

Step S1301：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S1302：Called UE sends 180 ALERTING messages to distal end (intermediate steps unrelated with the present embodiment are omitted)；

Step S1303：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and hair handover request is to MME/SGSN；

Step S1304：The bearer that MME/SGSN has found UE and has QCI=1 is carried；

Step S1305：MME/SGSN sends PS to CS handover requests to eMSC, optionally, when MME in step 1000 saves MSC2 information, then carries MSC2 information within the message；

Step S1306：EMSC reserves resource to target radio access network (Target RAN) RNC/BSS；Optionally, when eMSC receives MSC2 information, this process can be that eMSC determines that MSC2, as target Serving MSC, is completed by Serving MSC.

Step S1307：EMSC sends switching request response to MME, and expression can switch；

Step S1308：MME sends switching command by source wireless access network to UE；

Step S1309：UE is switched to CS domains, and discovery does not support alerting to switch；

Step S1310：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC.It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC；

Step S1311：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale alerting SRVCC/Pre-alerting SRVCC eventually；

Note：Step S1311 and step S1307 is parallel, without orbution.

Step S1312：SCC AS update distal end；

Step S1313：SCC AS notify eMSC, and UE is at present in alerting states；

Step S1314：EMSC sends Setup to UE.The message reaches UE by Serving MSC；

Step S1315：When user answers, UE sends Connect message.The message reaches eMSC by Serving MSC.

Note：EMSC and S-MSC can be same MSC.

Figure 14 is that the embodiment illustrated in fig. 9 that corresponds to according to embodiments of the present invention is under alerting states in UE, just occurs SRVCC, and UE does not support the flow chart in the case of alerting SRVCC, and as shown in figure 14, the flow comprises the following steps：

Step S1400：Optionally, UE does joint attachment update in EPC, and MME saves the MSC2 information of registration；

Step S1401：The SCC AS of callee side receive call request, and call request is transmitted to UE；

Step S1402：Called UE sends 180 ALERTING messages to distal end (intermediate steps unrelated with this patent are omitted)；

Step S1403：Source RAN, which have found that UE signal qualitys are bad, to be needed after switching, and hair handover request is to MME/SGSN；

Step S1404：The bearer that MME/SGSN has found UE and has QCI=1 is carried；

Step S1405：MME/SGSN sends PS to CS handover requests to eMSC, optionally, when MME in step step S1400 saves MSC2 information, then carries MSC2 information within the message；

Step S1406：EMSC reserves resource to target radio access network (Target RAN) RNC/BSS；Optionally, when eMSC receives MSC2 information, this process can be that eMSC determines that MSC2, as target Serving MSC, is completed by Serving MSC.

Step S1407：EMSC sends switching request response to MME, and expression can switch；

Step S1408：MME sends switching command by source wireless access network to UE；

Step S1409：UE is switched to CS domains, and discovery does not support alerting to switch；

Step S1410：UE sends out Disconnect message, and the message reaches eMSC by Serving MSC.It should be noted that the step is optional, if eMSC does not receive the message, eMSC is optional, and disconnect is sent out to UE by S-MSC；

Step S1411：EMSC initiates session handover request to the anchor point SCC AS of session.In the step, eMSC is optional, carries the instruction for supporting to exhale alerting SRVCC/Pre-alerting SRVCC eventually；

Note：Step step S1411 and step S1407 is parallel, without orbution.

Step S1412：SCC AS update distal end；

Step S1413：SCC AS notify eMSC, and UE is at present in alerting states；

Step S1414：EMSC sends routing inquiry request (Sending Routing Information, abbreviation SRI) to HLR；

Step S1415：HLR inquires about roaming number (Provide Roaming Number, abbreviation PRN) to Serving MSC, and Serving MSC return to terminal routing number (MS Routing Number, abbreviation MSRN) to HLR；

Step S1416：HLR returns to routing number to eMSC；

Step S1417：EMSC sends IAM message to Serving MSC；

Step S1418：Serving MSC send Setup message to UE；

Step S1419：When user answers, UE sends Connect message and gives Serving MSC.

Note：EMSC and S-MSC can be same MSC.Now become Figure 13 scheme.

Corresponding to Figure 10 embodiment, it is in UE under alerting states, just occur SRVCC, and UE does not support the preferred embodiment in the case of alerting SRVCC, it is similar with Figure 14, after difference is step 1413, eMSC is directly to Serving MSC query routing numbers, after routing number is received, and IAM call requests are initiated to Serving MSC, Serving MSC are received after IAM message, and Setup is initiated to UE.

Note：EMSC and S-MSC can be same MSC.Now become Figure 13 scheme.

Through the above description of the embodiments, those skilled in the art can be understood that the mode of general hardware platform necessary to according to the method for above-described embodiment by software can add to realize, can certainly the former be more preferably embodiment by hardware, but in many cases.Understood based on such, the part that technical scheme substantially contributes to prior art in other words can be embodied in the form of software product, the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal equipment (can be mobile phone, computer, server, or the network equipment etc.) method that performs each embodiment of the invention.

The processing unit switched between a kind of network is additionally provided in the present embodiment, and the device is used to realize above-described embodiment and preferred embodiment, has carried out repeating no more for explanation.As used below, term " module " can realize the combination of the software and/or hardware of predetermined function.Although the device described by following examples is preferably realized with software, hardware, or the realization of the combination of software and hardware is also that may and be contemplated.

Figure 15 is the structured flowchart of the processing unit one switched between network according to embodiments of the present invention, and as shown in figure 15, the device includes：First determining module 152 and processing module 154, are illustrated to the device below.

First determining module 152, during for determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Processing module 154, is connected to above-mentioned first determining module 152, for continuing based on switching after visited network carry out eventually exhale processing.

Figure 16 is the structured flowchart of the first determining module 152 in the processing unit switched between network according to embodiments of the present invention, and as shown in figure 16, first determining module 152 includes：First receiving unit 162 and the first determining unit 164, are illustrated to first determining module 152 below.

First receiving unit 162, for receiving the terminal status message that business is unanimously sent with continuous server SCC AS, and/or, receive the first connection failure message of terminal called transmission；First determining unit 164, is connected to above-mentioned first receiving unit 162, for according to terminal status message and/or the first connection failure message, determining SRVCC handoff failures.

Figure 17 is the preferred structure block diagram one of the processing unit one switched between network according to embodiments of the present invention, as shown in figure 17, the device in addition to including the structure shown in Figure 15, in addition to：Second determining module 172, is illustrated to second determining module 172 below.

Second determining module 172, is connected to above-mentioned first determining module 152, for the destination service mobile switching centre S-MSC for determining to be used to exhale processing eventually after network switching.

Figure 18 is the structured flowchart of the second determining module 172 in the processing unit switched between network according to embodiments of the present invention, and as shown in figure 18, second determining module 172 includes：Second receiving unit 182 and the second determining unit 184, are illustrated to second determining module 172 below.

Second receiving unit 182, for receiving the first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent, wherein, the identification information of the MSC for identifying terminal called registration is carried in first network handover request message；Second determining unit 184, is connected to above-mentioned second receiving unit 182, for determining that the MSC of identification information mark is target S-MSC.

Figure 19 is the structured flowchart of processing module 154 in the processing unit switched between network according to embodiments of the present invention, and as shown in figure 19, the processing module 154 includes at least one of：First transmitting element 192, the second transmitting element 194, are illustrated to the processing module 154 below.

First transmitting element 192, for the target S-MSC by determination, the first session establishment request message for setting up session is sent to terminal called；And/or, the second transmitting element 194 for inquiring about terminal roaming number from target S-MSC according to attaching position register HLR, or directly inquires about terminal roaming number from target S-MSC；Terminal roaming number according to inquiry sends the second session establishment request message for setting up session to terminal called.

Figure 20 is the preferred structure block diagram two of the processing unit one switched between network according to embodiments of the present invention, as shown in figure 20, the device in addition to including the structure shown in Figure 15, in addition to：First sending module 202, is illustrated to first sending module 202 below.

First sending module 202, is connected to above-mentioned first determining module 152 and processing module 154, for sending the second connection failure message to terminal called.

Figure 21 is a kind of enhanced mobile switching centre eMSC according to embodiments of the present invention structural representation, as shown in figure 21, and the eMSC 212 includes the processing unit 1 switched between the network of any of the above-described.

Preferably, the eMSC and serving mobile switching center S-MSC can be same MSC.

Figure 22 is the structured flowchart of the processing unit two switched between network according to embodiments of the present invention, and as shown in figure 22, the device includes：The sending module 224 of receiving module 222 and second, is illustrated to the device below.

Receiving module 222, for receiving the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；Second sending module 224, above-mentioned receiving module 222 is connected to, for according to the second network switching request message, the terminal status message of terminal called to be sent to eMSC, wherein, terminal status message continues to carry out exhaling processing eventually based on the visited network after switching for eMSC.

Preferably, when above-mentioned second network switching request message is additionally operable to determine that eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings.

Figure 23 is the structural representation of business according to embodiments of the present invention unanimously with continuous server SCC AS, as shown in figure 23, and the SCC AS 232 include the processing unit 2 234 switched between the network of any of the above-described.

Figure 24 is the structured flowchart of the processing unit three switched between network according to embodiments of the present invention, and as shown in figure 24, the device includes：The sending module 244 of memory module 242 and the 3rd, is illustrated to the device below.

Memory module 242, the moving exchanging center MSC for storing terminal called registration；3rd sending module 244, it is connected to above-mentioned memory module 242, for the 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying terminal called registration is carried in the 3rd network switching request message.Preferably, the identification information is used for eMSC in state before terminal called is in ringing condition or ring, before single radio voice call continuity SRVCC handoff failures, determines the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

Figure 25 is the structured flowchart of mobile management entity MME according to embodiments of the present invention, as shown in figure 25, and the MME 252 includes the processing unit 3 254 switched between above-mentioned network.

Figure 26 is GPRS service nodes SGSN according to embodiments of the present invention structured flowchart, as shown in figure 26, and the SGSN262 includes the processing unit 3 254 switched between above-mentioned network.

It should be noted that above-mentioned modules can be by software or hardware to realize, for the latter, it can be accomplished by the following way, but not limited to this：Above-mentioned module is respectively positioned in same processor；Or, above-mentioned module is located in multiple processors respectively.

Embodiments of the invention additionally provide a kind of storage medium.Alternatively, in the present embodiment, above-mentioned storage medium can be configured to the program code that storage is used to perform following steps：

S1, when determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；

S2, continues to carry out exhaling processing eventually based on the visited network after switching.

Alternatively, storage medium is also configured to the program code that storage is used to perform following steps：

When determining that terminal called is in state before ringing condition or ring, SRVCC handoff failures include：

S1, receives the terminal status message that business is unanimously sent with continuous server SCC AS, and/or, receive the first connection failure message of terminal called transmission；

S2, according to terminal status message and/or the first connection failure message, determines SRVCC handoff failures.

S1, the terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that the terminal called is in state before ringing condition or ring.

When it is determined that terminal called is in state before ringing condition or ring, before SRVCC handoff failures, in addition to：

S1, determines the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

Determine to be used to exhale the target S-MSC of processing to include eventually after network switching：

S1, receives the first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent, wherein, the identification information of the MSC for identifying terminal called registration is carried in first network handover request message；

S2, the MSC for determining identification information mark is target S-MSC.

Continue to carry out exhaling processing to include at least one of eventually based on the visited network after switching：

S1, by the target S-MSC of determination, the first session establishment request message for setting up session is sent to terminal called；And/or, terminal roaming number is inquired about from target S-MSC according to attaching position register HLR, or directly inquire about terminal roaming number from target S-MSC；Terminal roaming number according to inquiry sends the second session establishment request message for setting up session to terminal called.

S1, the first session establishment request message is Setup message, or, the second session establishment request message is initial address message IAM message.

Before the visited network after continuing based on switching carries out exhaling processing eventually, in addition to：

S1, the second connection failure message is sent to terminal called.

S1, receives the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；

S2, according to the second network switching request message, the terminal status message of terminal called is sent to eMSC, wherein, terminal status message, which is used for eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.

S1, when the second network switching request message is additionally operable to indicate that eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings；Or, the terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that the terminal called is in state before ringing condition or ring.

S1, the moving exchanging center MSC of storage terminal called registration；

S2, the 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying terminal called registration is carried in the 3rd network switching request message.

S1, identification information is used for eMSC in state before terminal called is in ringing condition or ring, before single radio voice call continuity SRVCC handoff failures, determines the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

Alternatively, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only storage (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can be with the medium of store program codes.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：When determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；Continue to carry out exhaling processing eventually based on the visited network after switching.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：When determining that terminal called is in state before ringing condition or ring, SRVCC handoff failures include：The terminal status message that business is unanimously sent with continuous server SCC AS is received, and/or, receive the first connection failure message of terminal called transmission；According to terminal status message and/or the first connection failure message, SRVCC handoff failures are determined.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：The terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or the identification information for not supporting SRVCC to switch during for determining that terminal called is in state before ringing condition or ring.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：When it is determined that terminal called is in state before ringing condition or ring, before SRVCC handoff failures, in addition to：Determine the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：Determine to be used to exhale the target S-MSC of processing to include eventually after network switching：The first network handover request message for being used to ask handover network that mobile management entity MME and/or GPRS service nodes SGSN are sent is received, wherein, the identification information of the MSC for identifying terminal called registration is carried in first network handover request message；The MSC for determining identification information mark is target S-MSC.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：Continue to carry out exhaling processing to include at least one of eventually based on the visited network after switching：By the target S-MSC of determination, the first session establishment request message for setting up session is sent to terminal called；And/or, terminal roaming number is inquired about from target S-MSC according to attaching position register HLR, or directly inquire about terminal roaming number from target S-MSC；Terminal roaming number according to inquiry sends the second session establishment request message for setting up session to terminal called.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：The first session establishment request message is Setup message, or, the second session establishment request message is initial address message IAM message.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：Before the visited network after continuing based on switching carries out exhaling processing eventually, in addition to：The second connection failure message is sent to terminal called.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：Receive the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；According to the second network switching request message, the terminal status message of terminal called is sent to eMSC, wherein, terminal status message, which is used for eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：When second network switching request message is additionally operable to indicate that eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings；Or, the terminal status message indicates that the terminal called is in state before ringing condition or ring, and/or does not support SRVCC to switch during for determining that terminal called is in state before ringing condition or ring.

Alternatively, in the present embodiment, processor is performed according to the program code stored in storage medium：

Store the moving exchanging center MSC of terminal called registration；The 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, wherein, the identification information of the MSC for identifying terminal called registration is carried in 3rd network switching request message, identification information is used for eMSC in state before terminal called is in ringing condition or ring, before single radio voice call continuity SRVCC handoff failures, the destination service mobile switching centre S-MSC for being used to exhale processing eventually after network switching is determined.

Alternatively, the specific example in the present embodiment may be referred to the example described in above-described embodiment and optional embodiment, and the present embodiment will not be repeated here.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the invention or each step can be realized with general computing device, they can be concentrated on single computing device, or be distributed on the network that multiple computing devices are constituted, alternatively, they can be realized with the executable program code of computing device, so as to, it can be stored in storage device and be performed by computing device, and in some cases, can be with the step shown or described by being performed different from order herein, or they are fabricated to each integrated circuit modules respectively, or be fabricated to single integrated circuit module to realize by the multiple modules or step in them.So, the present invention is not restricted to any specific hardware and software combination.

The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art, the present invention there can be various modifications and variations.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.

Claims

1. the processing method switched between a kind of network, it is characterised in that including：

When determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；

Continue to carry out exhaling processing eventually based on the visited network after switching.

2. according to the method described in claim 1, it is characterised in that determine that the terminal called is in shape before ringing condition or ring During state, the SRVCC handoff failures include：

The terminal status message that business is unanimously sent with continuous server SCC AS is received, and/or, receive described The first connection failure message that terminal called is sent；

According to the terminal status message and/or the first connection failure message, the SRVCC handoff failures are determined.

3. method according to claim 2, it is characterised in that the terminal status message indicates that the terminal called is in State before ringing condition or ring, and/or do not propped up during for determining that the terminal called is in state before ringing condition or ring Hold SRVCC switchings.

4. according to the method in any one of claims 1 to 3, it is characterised in that it is determined that the terminal called is in ring Before state or ring during state, before the SRVCC handoff failures, in addition to：

Determine that being used for the end after network switching exhales the destination service mobile switching centre S-MSC of processing.

5. method according to claim 4, it is characterised in that determine to exhale the mesh of processing after network switching for the end Mark S-MSC includes：

Being used for of receiving that mobile management entity MME and/or GPRS service nodes SGSN send asks the of handover network One network switching request message, wherein, carried in the first network handover request message for identifying the called end Hold the MSC of registration identification information；

The MSC for determining the identification information mark is the target S-MSC.

6. method according to claim 4, it is characterised in that continue to carry out exhaling place eventually based on the visited network after switching Reason includes at least one of：

By the target S-MSC of determination, the first session establishment sent to the terminal called for setting up session please Seek message；And/or,

Terminal roaming number is inquired about from the target S-MSC according to attaching position register HLR, or directly from described Target S-MSC inquires about the terminal roaming number；The terminal roaming number according to inquiry is sent to the terminal called The second session establishment request message for setting up session.

7. method according to claim 6, it is characterised in that the first session establishment request message is Setup message, or Person, the second session establishment request message is initial address message IAM message.

8. according to claims 1 to 3, the method any one of 5 to 7, it is characterised in that the institute after continuing based on switching State before visited network carries out exhaling processing eventually, in addition to：

The second connection failure message is sent to the terminal called.

9. the processing method switched between a kind of network, it is characterised in that including：

Receive the second network switching request message for being used to ask network switching that enhanced mobile switching centre eMSC is sent；

According to the second network switching request message, the terminal status message of terminal called is sent to the eMSC, its In, the terminal status message, which is used for the eMSC, to be continued to carry out exhaling processing eventually based on the visited network after switching.

10. method according to claim 9, it is characterised in that it is described that the second network switching request message is additionally operable to instruction When eMSC supports the state before ringing condition or ring, single radio voice call continuity SRVCC switchings；Or, the end End status message indicates that the terminal called is in state before ringing condition or ring, and/or for determining the called end SRVCC is not supported to switch during state before ringing condition or ring in end.

11. the processing method switched between a kind of network, it is characterised in that including：

Store the moving exchanging center MSC of terminal called registration；

The 3rd network switching request message for being used to ask network switching sent to enhanced mobile switching centre eMSC, Wherein, the mark of the MSC for identifying the terminal called registration is carried in the 3rd network switching request message Know information.

12. method according to claim 11, it is characterised in that the identification information is used for the eMSC at the called end End during state, before single radio voice call continuity SRVCC handoff failures, determines network switching before ringing condition or ring It is used for the destination service mobile switching centre S-MSC for exhaling processing eventually afterwards.

13. the processing unit switched between a kind of network, it is characterised in that including：

First determining module, during for determining that terminal called is in state before ringing condition or ring, single radio voice call continuity SRVCC handoff failures；

Processing module, for continuing based on switching after visited network carry out eventually exhale processing.

14. device according to claim 13, it is characterised in that first determining module includes：

First receiving unit, for receiving the terminal status message that business is unanimously sent with continuous server SCC AS, And/or, receive the first connection failure message that the terminal called is sent；

First determining unit, for according to the terminal status message and/or the first connection failure message, it is determined that described SRVCC handoff failures.

15. the device according to claim 13 or 14, it is characterised in that also include：

Second determining module, for determining that being used for the end after network switching exhales the destination service mobile switching centre of processing S-MSC。

16. device according to claim 15, it is characterised in that second determining module includes：

Second receiving unit, for receiving the use that mobile management entity MME and/or GPRS service nodes SGSN are sent In the first network handover request message of request handover network, wherein, carried in the first network handover request message For the identification information for the MSC for identifying the terminal called registration；

Second determining unit, for determining that the MSC of the identification information mark is the target S-MSC.

17. device according to claim 15, it is characterised in that the processing module includes at least one of：

First transmitting element, for the target S-MSC by determination, sends for setting up meeting to the terminal called First session establishment request message of words；And/or,

Second transmitting element, for inquiring about terminal roaming number from the target S-MSC according to attaching position register HLR Code, or directly inquire about the terminal roaming number from the target S-MSC；The terminal roaming number according to inquiry The second session establishment request message for setting up session is sent to the terminal called.

18. according to claim 13 to 14, the device any one of 16 to 17, it is characterised in that also include：

First sending module, for sending the second connection failure message to the terminal called.

19. a kind of enhanced mobile switching centre eMSC, it is characterised in that including the dress any one of claim 13 to 18 Put.

20. a kind of eMSC according to claim 19, it is characterised in that the eMSC and serving mobile switching center S-MSC For same MSC.

21. the processing unit switched between a kind of network, it is characterised in that including：

Receiving module, for receiving the second net for being used to ask network switching that enhanced mobile switching centre eMSC is sent Network handover request message；

Second sending module, for according to the second network switching request message, terminal called to be sent to the eMSC Terminal status message, wherein, the terminal status message be used for the eMSC continue based on the visit after switching Network carries out exhaling processing eventually.

22. a kind of business unanimously with continuous server SCC AS, it is characterised in that including the device described in claim 21.

23. the processing unit switched between a kind of network, it is characterised in that including：

Memory module, the moving exchanging center MSC for storing terminal called registration；

3rd sending module, for enhanced mobile switching centre eMSC send be used for ask the 3rd of network switching Network switching request message, wherein, carried in the 3rd network switching request message for identifying the terminal called The MSC of registration identification information.

24. a kind of mobile management entity MME, it is characterised in that including the device described in claim 23.

25. a kind of GPRS service nodes SGSN, it is characterised in that including the device described in claim 23.