CN105282805B

CN105282805B - For call business to be switched to the methods, devices and systems in the domain CS from ps domain

Info

Publication number: CN105282805B
Application number: CN201410356978.1A
Authority: CN
Inventors: 聂衡; 毛聪杰
Original assignee: China Telecom Corp Ltd
Current assignee: China Telecom Corp Ltd
Priority date: 2014-07-25
Filing date: 2014-07-25
Publication date: 2019-02-26
Anticipated expiration: 2034-07-25
Also published as: CN105282805A

Abstract

The present invention discloses a kind of for call business to be switched to the methods, devices and systems in the domain CS from ps domain.Wherein for user terminal in the state that ps domain has call business, whether the network signal intensity for detecting ps domain is less than predetermined threshold；If the network signal intensity of ps domain is less than predetermined threshold, connection management request is sent to application server AS in the domain CS, to establish the connection with call business participant in the domain CS；When receiving the conversation end request of AS transmission, the connection in ps domain and call business participant is disconnected, call business is switched to the domain CS from ps domain to realize.The present invention can also provide LTE voice service in the case where LTE is not up to all standing without upgrading to the function and interface protocol of existing net MSC faster, for greater flexibility.

Description

For call business to be switched to the methods, devices and systems in the domain CS from ps domain

Technical field

It is the present invention relates to the communications field, in particular to a kind of for by call business, from PS, (Packet Switch to be grouped Exchange) domain is switched to the methods, devices and systems in CS (Circuit Switch, circuit switching) domain.

Background technique

In VoLTE (Voice over LTE, the voice based on LTE) voice technology, 3GPP (3rd Generation Partnership Project, third generation partner program) it provides for supporting LTE (Long Term Evolution, length Phase evolution)+2G/3G double-mode and double-standby terminal can using DRVCC (Dual Radio Voice Call Continuity, it is double Mould continuous voice call) technology protect come the switching between the circuit domain voice of the VoLTE voice and the domain CS of realizing ps domain Continuity of the voice service between LTE network (i.e. ps domain) and tradition 2G3G network (i.e. the domain CS) is demonstrate,proved, this terminal is also claimed For DRVCC terminal.

For CDMA (Code Division Multiple Access, CDMA) operator, DRVCC terminal refers to Support the terminal of LTE+CDMA dual-mode dual-standby.The DRVCC terminal of 3GPP specification (such as is called in the business of Three-Way Calling class at present Wait, Three-Way Calling) during occur PS to CS switching when, need the domain CS MSC (Mobile Switching Center, shifting Dynamic switching centre) support mid-call function or ICS (IMS Centralized Service, IMS centralized traffic) function, Therefore the MSC that operator now nets needs to carry out function and interface protocol upgrading.

Summary of the invention

The embodiment of the present invention provides a kind of for call business to be switched to the methods, devices and systems in the domain CS from ps domain. By the way that calling class service is switched to the domain CS from ps domain, without to existing net MSC function and interface protocol upgrade, LTE can also provide LTE voice service in the case where being not up to all standing faster, for greater flexibility.

According to an aspect of the present invention, a kind of method for call business to be switched to the domain CS from ps domain is provided, is wrapped It includes:

In the state that ps domain has call business, whether the network signal intensity for detecting ps domain is less than predetermined threshold；

If the network signal intensity of ps domain is less than predetermined threshold, connection management is sent to application server AS in the domain CS and is asked It asks, to establish the connection with call business participant in the domain CS；

When receiving the conversation end request of AS transmission, the connection in ps domain and call business participant is disconnected, thus It realizes and call business is switched to the domain CS from ps domain.

In one embodiment, the state is that the two party call for being in call waiting in ps domain notifies state；

Connection management request is sent to AS in the domain CS, so as to the step of the domain CS is established with the connection of call business participant Include:

The request of the first connection management is sent to calling user in the domain CS, wherein the request of the first connection management includes the routing of AS Code, so that the request of the first connection management can be routed to AS；So that AS is when receiving the request of the first connection management, update logical Talk about the voice medium SDP of user；

When moving exchanging center MSC corresponding with itself receives the first request-reply of AS transmission in the cs domain, benefit With the voice medium SDP for the current talking user for including in the first request-reply, the connection with calling user is connected in the domain CS；Its Middle AS sends first request-reply after the voice medium SDP for updating calling user；

When receiving the conversation end request of AS transmission, disconnect the connection of ps domain and call business participant the step of Include:

When receiving the first conversation end request of AS transmission, the connection in ps domain and calling user is disconnected；Wherein AS The first conversation end request is sent after sending first request-reply.

In one embodiment, after disconnecting the connection of ps domain and calling user the step of, further includes:

When receiving the first notification message that the MSC is sent, Call Waiting associated with user is waited is known, from And state is notified in the two party call that the domain CS enters call waiting；Wherein the MSC is exhaled in receive AS transmission first First notification message is sent after crying, the first calling includes calling number, and calling number is the number for waiting user；

When receiving the first release message of AS transmission, the ps domain between release and waiting user is called, and wherein AS exists First release message is sent when receiving the first call answering that the MSC is sent.

In one embodiment, the state is to be in the two party call wait state of call waiting in ps domain；

The request of the second connection management is sent to user is hung up in the domain CS, wherein the request of the second connection management includes the routing of AS Code, so that the request of the second connection management can be routed to AS；So that AS is when receiving the request of the second connection management, updates and hang Play the voice medium SDP of user；

When MSC corresponding with itself receives the second request-reply of AS transmission in the cs domain, answered using the second request The voice medium SDP for the current hang-up user for including in answering establishes the calling with hang-up user in the domain CS；Wherein AS is updating extension Second request-reply is sent after playing the voice medium SDP of user, and is continuously maintained at described with calling that is hanging up user Suspended state；

When receiving the second conversation end request of AS transmission, the connection of user is disconnected in ps domain and hung up；Wherein AS The second conversation end request is sent after sending second request-reply.

In one embodiment, after the step of disconnecting in ps domain and hang up the connection of user, further includes:

When receiving the second notification message that the MSC is sent, Call Waiting associated with calling user is known, with Just state is notified in the two party call that the domain CS enters call waiting；Wherein the MSC is receiving the of SCC AC transmission The second notification message is sent when two callings, the second calling includes calling number, and calling number is the number of calling user；

The second notice response is sent to the MSC, it, will be with hang-up user to connect the connection with calling user in the domain CS Between calling hang up so that entering the two party call wait state of call waiting in the domain CS；

When receiving the second release message of AS transmission, the ps domain between release and calling user is called；Wherein AS exists When receiving the second call answering that the MSC is sent, the voice medium SDP of calling user is updated, and send described second and release Put message.

In one embodiment, the state is to be in the holding two party call state of third-party call business in ps domain；

The request of third connection management is sent to user is hung up in the domain CS, wherein the request of third connection management includes the routing of AS Code, so that the request of third connection management can be routed to AS；So that AS is when receiving the request of third connection management, updates and hang Play the voice medium SDP of user；

When MSC corresponding with itself receives the third request-reply of AS transmission in the cs domain, answered using third request The voice medium SDP for the current hang-up user for including in answering establishes the calling with hang-up user in the domain CS；Wherein AS is updating extension The third request-reply is sent after playing the voice medium SDP of user, and is continuously maintained at described with calling that is hanging up user Suspended state；

When receiving the third conversation end request of AS transmission, the connection of user is disconnected in ps domain and hung up；Wherein AS The third conversation end request is sent after sending the third request-reply.

Third notice message is sent to the MSC in the domain CS, to connect the connection with calling user in the cs domain, and is made The MSC sends third calling to calling user, wherein third calling includes the route code of AS, so that third calling can be by It is routed to AS；

When receiving the third release message of AS transmission, the ps domain between release and calling user is connected；Wherein AS exists The voice medium SDP that calling user is updated when the third calling of MSC transmission is received, by the voice medium of current talking user SDP is sent to the MSC, and sends the third release message.

In one embodiment, the state is to be in the third-party call state of third-party call business in ps domain；

The request of the 4th connection management is sent to specified session participant in the domain CS, wherein the request of the 4th connection management includes AS Route code so that the 4th connection management request can be routed to AS；So that AS is when receiving the request of the 4th connection management, Update the voice medium SDP of Conference server；

When MSC corresponding with itself receives four request-reply of AS transmission in the cs domain, answered using the 4th request The voice medium SDP for the current hang-up user for including in answering connects the connection with Conference server in the domain CS；

When receiving the 4th conversation end request of AS transmission, the connection in ps domain and Conference server is disconnected；Wherein AS sends the 4th conversation end request after sending the 4th request-reply.

According to another aspect of the present invention, a kind of method for call business to be switched to the domain CS from ps domain is provided, is wrapped It includes:

In the connection management request for receiving user terminal transmission, user terminal is established in the domain CS and call business participates in The connection of side；Wherein user terminal is when ps domain has call business and the network signal intensity of ps domain is less than predetermined threshold, hair The connection management is sent to request；

Conversation end request is sent to user terminal, so that user terminal disconnects the company in ps domain and call business participant It connects, the call business of user terminal is switched to the domain CS from ps domain to realize.

In one embodiment, in the connection management request for receiving user terminal transmission, user's end is established in the domain CS End and call business participant connection the step of include:

Receive user terminal be sent to calling user the first connection management request when, update the voice of calling user Media SDP；Wherein user terminal is in the case where ps domain is in the two party call notice state of call waiting, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the first connection management request to calling user in the domain CS；

Into the domain CS, moving exchanging center MSC corresponding with user terminal sends the first request-reply, so as to user's end The company with calling user is connected in the domain CS using the voice medium SDP for the current talking user for including in the first request-reply in end It connects；

Conversation end request is sent to user terminal, so that user terminal disconnects the company in ps domain and call business participant The step of connecing include:

The request of the first conversation end is sent to user terminal, so that user terminal disconnects the company in ps domain and calling user It connects.

In one embodiment, after sending the step of the first conversation end is requested to user terminal, further includes:

The first calling is sent to user terminal in the domain CS, wherein the first calling includes calling number and the route code of the domain CS, master Code of calling out the numbers is the number for waiting user, and the route code of the domain CS is used for can be by the first call routing to the MSC；So as to the MSC According to the first calling, the first notification message is sent to user terminal, so that user terminal knows that user is associated exhales with waiting Waiting is cried, notifies state in the two party call that the domain CS enters call waiting；

When receiving the first call answering that the MSC is sent, the first release message is sent to user terminal, to release It puts user terminal and the ps domain between user is waited to call, wherein the MSC sends institute after sending first notification message State the first call answering.

Receive user terminal be sent to hang up user the second connection management request when, update hang up user voice Media SDP；Wherein user terminal is under the two party call wait state that ps domain is in call waiting, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the second connection management request to user is hung up in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends the second request-reply, wherein including in the second request-reply The current voice medium SDP for hanging up user, to establish user terminal in the domain CS and to hang up the calling of user, and by user terminal Suspended state is continuously maintained at the calling hung up between user；

The request of the second conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the company of user It connects.

In one embodiment, after sending the step of the second conversation end is requested to user terminal, further includes:

The second calling is sent to user terminal in the domain CS, wherein the second calling includes calling number and the route code of the domain CS, master Code of calling out the numbers is the number of calling user, and the route code of the domain CS is used for can be by the second call routing to the MSC；So as to the MSC According to the second calling, second notification message is sent to user terminal, so that user terminal knows exhale associated with communication user Waiting is cried, notifies state in the two party call that the domain CS enters call waiting；

When receiving the second call answering that the MSC is sent, the voice medium SDP of calling user is updated；Wherein institute MSC is stated in the second notice response for receiving user terminal transmission, in the connection of the domain CS connecting subscribers participating terminal and calling user, By user terminal and the calling hang-up between user is hung up, so that user terminal is exhaled in two sides that the domain CS enters call waiting It is wait state, and sends second call answering；

The second release message is sent to user terminal, to discharge the calling of the ps domain between user terminal and calling user.

Receive user terminal be sent to hang up user third connection management request when, update hang up user voice Media SDP；Wherein user terminal is in the case where ps domain is in the holding two party call state of third-party call business, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the third connection management request to user is hung up in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends third request-reply, wherein includes in third request-reply The current voice medium SDP for hanging up user, to establish user terminal in the domain CS and to hang up the calling of user, and by user terminal Suspended state is continuously maintained at the calling hung up between user；

The request of third conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the company of user It connects.

In one embodiment, after sending the step of third conversation end is requested to user terminal, further includes:

When receive MSC be sent to calling user third calling when, update the voice medium SDP of calling user, wherein MSC connects the connection with calling user when receiving the third notice message of user terminal transmission in the cs domain, and sends institute State third calling；

Third call answering is sent to the MSC, so that the SDP of current talking user is supplied to the MSC；

Third release message is sent to user terminal, to discharge the connection of the ps domain between user terminal and calling user.

Receive user terminal be sent to specified session participant the 4th connection management request when, update conference service The voice medium SDP of device；Wherein user terminal is under the third-party call state that ps domain is in third-party call business, if the net of ps domain Network signal strength is less than predetermined threshold, then sends the 4th connection management request to specified session participant in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends the 4th request-reply, wherein the 4th request-reply includes working as The voice medium SDP of preceding Conference server, so that user terminal connects the connection with Conference server in the domain CS；

The request of the 4th conversation end is sent to user terminal, so that user terminal disconnects the company in ps domain and Conference server It connects.

According to another aspect of the present invention, it is whole to provide a kind of user for call business to be switched to the domain CS from ps domain End, including detection unit, first interface unit and switch unit, in which:

Detection unit, in the state that ps domain has call business, whether the network signal intensity for detecting ps domain to be small In predetermined threshold；

First interface unit makes a reservation for for the testing result according to detection unit if the network signal intensity of ps domain is less than Thresholding then sends connection management request to application server AS in the domain CS, to establish and call business participant in the domain CS Connection；

Switch unit, for when first interface unit receive AS transmission conversation end request when, disconnect ps domain with Call business is switched to the domain CS from ps domain to realize by the connection of call business participant.

First interface unit specifically sends the request of the first connection management to calling user in the domain CS, wherein the first connection management Request includes the route code of AS, so that the request of the first connection management can be routed to AS；So that AS is receiving the first connection When management request, the voice medium SDP of calling user is updated；

Specifically moving exchanging center MSC corresponding with user terminal receives the of AS transmission to switch unit in the cs domain When one request-reply, using the voice medium SDP for the current talking user for including in the first request-reply, connects and lead in the domain CS Talk about the connection of user；Wherein AS sends first request-reply after the voice medium SDP for updating calling user；It connects when first When mouth unit receives the first conversation end request of AS transmission, the connection in ps domain and calling user is disconnected；Wherein AS is being sent out The first conversation end request is sent after sending first request-reply.

In one embodiment, switch unit is also used to lead to when first interface unit receives the first of the MSC transmission When knowing message, Call Waiting associated with user is waited is known, to enter the two party call of call waiting in the domain CS Notice state；Wherein the MSC sends first notification message, the first calling packet after the first calling for receiving AS transmission Calling number is included, calling number is the number for waiting user；When first interface unit receives the first release message of AS transmission When, the ps domain between release and waiting user calls, wherein AS transmission when receiving the first call answering that the MSC is sent First release message.

First interface unit specifically sends the request of the second connection management to user is hung up in the domain CS, wherein the second connection management Request includes the route code of AS, so that the request of the second connection management can be routed to AS；So that AS is receiving the second connection When management request, the voice medium SDP for hanging up user is updated；

Switch unit specifically in the cs domain MSC corresponding with itself receive AS transmission the second request-reply when, benefit With the voice medium SDP for the current hang-up user for including in the second request-reply, the calling with hang-up user is established in the domain CS；Its Middle AS sends second request-reply after updating the voice medium SDP for hanging up user, and by the exhaling with hang-up user It cries and is continuously maintained at suspended state；When first interface unit receives the second conversation end request of AS transmission, disconnect in PS Domain and the connection for hanging up user；Wherein AS sends the second conversation end request after sending second request-reply.

In one embodiment, switch unit is also used to lead to when first interface unit receives the second of the MSC transmission When knowing message, Call Waiting associated with calling user is known, to enter the two party call of call waiting in the domain CS Notice state；Wherein the MSC sends the second notification message when receiving the second calling of SCC AC transmission, and second exhales It cries including calling number, calling number is the number of calling user；Indicate that first interface unit sends the second notice to the MSC Response；When first interface unit receives the second release message of AS transmission, the ps domain between release and calling user is called； Wherein AS updates the voice medium SDP of calling user, and send institute when receiving the second call answering that the MSC is sent State the second release message；

First interface unit is also used to the instruction according to switch unit, and Xiang Suoshu MSC sends the second notice response, so as to The connection with calling user is connected in the domain CS, will be hung up the calling between user and is hung up, so that entering Call Waiting industry in the domain CS The two party call wait state of business.

First interface unit specifically sends the request of third connection management to user is hung up in the domain CS, wherein third connection management Request includes the route code of AS, so that the request of third connection management can be routed to AS；So that AS is receiving third connection When management request, the voice medium SDP for hanging up user is updated；

Switch unit specifically in the cs domain MSC corresponding with itself receive AS transmission third request-reply when, benefit With the voice medium SDP for the current hang-up user for including in third request-reply, the calling with hang-up user is established in the domain CS；Its Middle AS sends the third request-reply after updating the voice medium SDP for hanging up user, and by the exhaling with hang-up user It cries and is continuously maintained at suspended state；When first interface unit receives the third conversation end request of AS transmission, disconnect in PS Domain and the connection for hanging up user；Wherein AS sends the third conversation end request after sending the third request-reply.

In one embodiment, switch unit be also used to disconnect ps domain and hang up user connection after, the domain CS to The MSC sends third notice message, to connect the connection with calling user in the cs domain, and makes the MSC to call User sends third calling, and wherein third calling includes the route code of AS, so that third calling can be routed to AS；First When interface unit receives the third release message of AS transmission, the ps domain between release and calling user is connected；Wherein AS is connecing The voice medium SDP that calling user is updated when the third calling of MSC transmission is received, by the voice medium SDP of current talking user It is sent to the MSC, and sends the third release message；

First interface unit is also used to the instruction according to switch unit, sends third notice to calling user in the domain CS and disappears Breath, wherein third notice message includes the route code of AS, and third notice message is enabled to be routed to AS；So that AS is being received When to third notice message, the voice medium SDP of calling user is updated.

First interface unit specifically sends the request of the 4th connection management to specified session participant in the domain CS, wherein the 4th connects Adapter tube reason request includes the route code of AS, so that the request of the 4th connection management can be routed to AS；So that AS is receiving When four connection managements are requested, the voice medium SDP of Conference server is updated；

Switch unit specifically in the cs domain MSC corresponding with itself receive AS transmission four request-replies when, benefit With the voice medium SDP for the current hang-up user for including in the 4th request-reply, the connection with Conference server is connected in the domain CS； When first interface unit receives the 4th conversation end request of AS transmission, the connection in ps domain and Conference server is disconnected； Wherein AS sends the 4th conversation end request after sending the 4th request-reply.

According to another aspect of the present invention, it provides a kind of for call business to be switched to the application service in the domain CS from ps domain Device, including second interface unit and connection control unit, in which:

Second interface unit, for receiving the connection management request of user terminal transmission；Wherein user terminal has in ps domain When thering is call business and the network signal intensity of ps domain to be less than predetermined threshold, the connection management request is sent；It is controlled according to connection The instruction of unit processed sends conversation end request to user terminal, participates in so that user terminal is disconnected in ps domain and call business The call business of user terminal is switched to the domain CS from ps domain to realize by the connection of side；

Control unit is connected, when for receiving the connection management request of user terminal transmission in second interface unit, CS establishes in domain the connection of user terminal Yu call business participant, and instruction second interface unit sends conversation end to user terminal Request.

In one embodiment, connection control unit specifically receive user terminal be sent to calling user first connect When adapter tube reason request, the voice medium SDP of calling user is updated；Wherein user terminal is in the two of call waiting in ps domain Under party call notice state, if the network signal intensity of ps domain is less than predetermined threshold, in the domain CS to described in calling user transmission The request of first connection management；Indicate second interface unit moving exchanging center MSC hair corresponding with user terminal into the domain CS The first request-reply is sent, so that user terminal utilizes the voice medium SDP for the current talking user for including in the first request-reply, The connection with calling user is connected in the domain CS；Indicate that second interface unit sends the request of the first conversation end to user terminal, with Just user terminal disconnects the connection in ps domain and calling user.

In one embodiment, second interface unit is also used to after sending the request of the first conversation end to user terminal, The first calling is sent to user terminal in the domain CS, wherein the first calling includes calling number and the route code of the domain CS, calling number are The number of user is waited, the route code of the domain CS is used for can be by the first call routing to the MSC；So that the MSC is according to first Calling sends the first notification message to user terminal, so that user terminal knows Call Waiting associated with user is waited, The domain CS enters the two party call notice state of call waiting；When receiving the first call answering that the MSC is sent, to User terminal sends the first release message, to discharge user terminal and the ps domain between user to be waited to call, wherein the MSC First call answering is sent after sending first notification message.

In one embodiment, connection control unit specifically receives user terminal in second interface unit and is sent to hang-up When the second connection management request of user, the voice medium SDP for hanging up user is updated；Wherein user terminal is in calling in ps domain Under the two party call wait state of latency services, if the network signal intensity of ps domain is less than predetermined threshold, in the domain CS to hang-up User sends the second connection management request；Indicate second interface unit MSC hair corresponding with user terminal into the domain CS The second request-reply is sent, wherein including the current voice medium SDP for hanging up user in the second request-reply, to establish in the domain CS User terminal and the calling for hanging up user, and the calling between user terminal and hang-up user is continuously maintained at suspended state； Second interface unit is indicated to user terminal transmission the second conversation end request, so that user terminal is disconnected in ps domain and hangs up use The connection at family.

In one embodiment, second interface unit is also used to after sending the request of the second conversation end to user terminal, The second calling is sent to user terminal in the domain CS, wherein the second calling includes calling number and the route code of the domain CS, calling number are The number of calling user, the route code of the domain CS is used for can be by the second call routing to the MSC；So that the MSC is according to second Calling sends second notification message to user terminal, so that user terminal knows Call Waiting associated with communication user, The domain CS enters the two party call notice state of call waiting；

Connection control unit is also used to when second interface unit receives the second call answering that the MSC is sent, more The voice medium SDP of new calling user；Wherein the MSC is in the second notice response for receiving user terminal transmission, in CS The connection of domain connecting subscribers participating terminal and calling user by user terminal and hangs up the calling hang-up between user, so that user is whole End enters the two party call wait state of call waiting in the domain CS, and sends second call answering；Instruction second connects Mouth unit sends the second release message to user terminal, to discharge the calling of the ps domain between user terminal and calling user.

In one embodiment, connection control unit, which is also used to receive user terminal in second interface unit, is sent to extension When playing the third connection management request of user, the voice medium SDP for hanging up user is updated；Wherein user terminal is in three in ps domain Under the holding two party call state of party call business, if the network signal intensity of ps domain is less than predetermined threshold, in the domain CS to extension It plays user and sends the third connection management request；Indicate second interface unit MSC corresponding with user terminal into the domain CS Third request-reply is sent, includes wherein the current voice medium SDP for hanging up user in third request-reply, to be built in the domain CS Vertical user terminal and the calling for hanging up user, and the calling between user terminal and hang-up user is continuously maintained at hang-up shape State；Indicate that second interface unit sends the request of third conversation end to user terminal, so that user terminal is disconnected in ps domain and is hung Play the connection of user.

In one embodiment, connection control unit is also used to be sent to call use when second interface unit receives MSC When the third calling at family, the voice medium SDP of calling user is updated, wherein MSC is logical in the third for receiving user terminal transmission When knowing message, the connection with calling user is connected in the cs domain, and sends the third calling；Indicate second interface unit to institute It states MSC and sends third call answering, so that the SDP of current talking user is supplied to the MSC；Indicate second interface unit to User terminal sends third release message, to discharge the connection of the ps domain between user terminal and calling user.

In one embodiment, connection control unit is specifically sent to specified session participant receiving user terminal When 4th connection management is requested, the voice medium SDP of Conference server is updated；Wherein user terminal is in third-party call in ps domain Under the third-party call state of business, if the network signal intensity of ps domain is less than predetermined threshold, participated in the domain CS to specified session Side sends the 4th connection management request；Indicate that second interface unit MSC corresponding with user terminal into the domain CS is sent 4th request-reply, wherein the 4th request-reply includes the voice medium SDP of active conference server, so that user terminal is in CS The connection with Conference server is connected in domain；Indicate that second interface unit sends the request of the 4th conversation end to user terminal, so as to User terminal disconnects the connection in ps domain and Conference server.

According to another aspect of the present invention, a kind of system for call business to be switched to the domain CS from ps domain is provided, is wrapped Include user terminal and application server, in which:

User terminal, the user terminal being related to for any of the above-described embodiment；

Application server, the application server being related to for any of the above-described embodiment.

The present invention by the interaction of user terminal and application server, when user terminal sends third-party call class business from Ps domain is switched to the domain CS, without to existing net MSC function and interface protocol upgrade, be not up to all standing in LTE In the case of LTE voice service can be also provided faster, for greater flexibility.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art To obtain other drawings based on these drawings.

Fig. 1 is the schematic diagram of method one embodiment that call business is switched to the domain CS by the present invention from ps domain.

Fig. 2 is the schematic diagram for another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 3 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 4 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 5 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 6 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 7 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 8 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Fig. 9 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Figure 10 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.

Figure 11 is the schematic diagram of user terminal one embodiment of the present invention.

Figure 12 is the schematic diagram of application server one embodiment of the present invention.

Figure 13 is the schematic diagram of system one embodiment that call business is switched to the domain CS by the present invention from ps domain.

Figure 14 is the schematic diagram that calling class service of the present invention switches one embodiment.

Figure 15 is the schematic diagram that calling class service of the present invention switches another embodiment.

Figure 16 is the schematic diagram that calling class service of the present invention switches another embodiment.

Figure 17 is the schematic diagram that calling class service of the present invention switches another embodiment.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, shall fall within the protection scope of the present invention.

Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments It is not limited the scope of the invention up to formula and numerical value.

Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality Proportionate relationship draw.

Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as authorizing part of specification.

It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.

It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.

Fig. 1 is the schematic diagram of method one embodiment that call business is switched to the domain CS by the present invention from ps domain.Preferably, The method and step of the present embodiment can be executed by user terminal.For example, user terminal can be DRVCC terminal.

Step 101, ps domain have call business in the state of, detect ps domain network signal intensity whether be less than it is predetermined Thresholding.

Preferably, above-mentioned state can be call waiting two party call notice state, call waiting two The third-party call state of party call wait state, holding the two party call state and third-party call business of third-party call business.

Step 102, it if the network signal intensity of ps domain is less than predetermined threshold, sends and connects to application server AS in the domain CS Adapter tube reason request, to establish the connection with call business participant in the domain CS.

Step 103, when receiving the conversation end request of AS transmission, the company in ps domain and call business participant is disconnected It connects, call business is switched to the domain CS from ps domain to realize.

Fig. 2 is the schematic diagram for another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by AS.Preferably, AS can be SCC AS (Service Centralization and Continuity Application services centralization and application server for continuity).

Step 201, in the connection management request for receiving user terminal transmission, user terminal and calling are established in the domain CS The connection of business participant.

Wherein user terminal is when ps domain has call business and the network signal intensity of ps domain is less than predetermined threshold, hair The connection management is sent to request.

Step 202, conversation end request is sent to user terminal, joined so that user terminal is disconnected in ps domain and call business With the connection of side, the call business of user terminal is switched to the domain CS from ps domain to realize.

Based on the method that call business is switched to the domain CS from ps domain that the above embodiment of the present invention provides, without right It now nets the function of MSC and interface protocol is upgraded, can also be mentioned faster, for greater flexibility in the case where LTE is not up to all standing For LTE voice service.

It is described below for the different particular states of calling class service.

Fig. 3 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by user terminal.In this embodiment, for state be user terminal at ps domain State is notified in the two party call of call waiting.For example, user terminal A is in this state, call shape is in user B State additionally receives the Call Waiting notice of user C.

Step 301, the request of the first connection management is sent to calling user in the domain CS, wherein the request of the first connection management includes The route code of AS, so that the request of the first connection management can be routed to AS.

So that AS is when receiving the request of the first connection management, the voice medium SDP (Session of calling user is updated Description Protocol, Session Description Protocol).

Step 302, the first request that moving exchanging center MSC corresponding with itself receives AS transmission in the cs domain is answered When answering, using the voice medium SDP for the current talking user for including in the first request-reply, connected and calling user in the domain CS Connection.

Preferably, mobile switching centre may be that (Mobile Switching Center emulation is moved MSCe Dynamic soft switch center).

Wherein AS sends first request-reply after the voice medium SDP for updating calling user.

Step 303, when receiving the first conversation end request of AS transmission, the company in ps domain and calling user is disconnected It connects.

Wherein AS sends the first conversation end request after sending first request-reply.

Step 304, when receiving the first notification message that the MSC is sent, know that user is associated exhales with waiting Waiting is cried, to notify state in the two party call that the domain CS enters call waiting.

Wherein the MSC sends first notification message, the first calling packet after the first calling for receiving AS transmission Calling number is included, calling number is the number for waiting user.

Step 305, when receiving the first release message of AS transmission, the ps domain between release and waiting user is called.

Wherein AS sends first release message when receiving the first call answering that the MSC is sent.

To which the call waiting of user terminal is switched to the domain CS by ps domain.

Fig. 4 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by AS, to match with the method and step in embodiment illustrated in fig. 3, to realize switching Operation.In this embodiment, for state be user terminal ps domain be in call waiting two party call notice shape State.

Step 401, receive user terminal be sent to calling user the first connection management request when, update call use The voice medium SDP at family.

Wherein user terminal is in the case where ps domain is in the two party call notice state of call waiting, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the first connection management request to calling user in the domain CS.

Step 402, into the domain CS, moving exchanging center MSC corresponding with user terminal sends the first request-reply, with Just user terminal is connected and is conversed in the domain CS using the voice medium SDP for the current talking user for including in the first request-reply The connection of user.

Step 403, the request of the first conversation end is sent to user terminal, is used so that user terminal is disconnected in ps domain and call The connection at family.

Step 404, the first calling is sent to user terminal in the domain CS, wherein the first calling includes calling number and the domain CS road By code, calling number is the number for waiting user, and the route code of the domain CS is used for can be by the first call routing to the MSC.

So as to the MSC according to first calling, to user terminal send the first notification message so that user terminal know with The associated Call Waiting of user is waited, notifies state in the two party call that the domain CS enters call waiting.

Step 405, when receiving the first call answering that the MSC is sent, the first release is sent to user terminal and is disappeared Breath, to discharge user terminal and the ps domain between user to be waited to call, wherein the MSC is sending first notification message After send first call answering.

So that the call waiting of user terminal are switched to the domain CS by ps domain.

Fig. 5 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by user terminal.In this embodiment, for state be user terminal at ps domain In the two party call wait state of call waiting.For example, user terminal A and user B are in calling hold mode, user is whole Hold A and user C on call.

Step 501, the request of the second connection management is sent to user is hung up in the domain CS, wherein the request of the second connection management includes The route code of AS, so that the request of the second connection management can be routed to AS.

So that AS is when receiving the request of the second connection management, the voice medium SDP for hanging up user is updated.

Step 502, when MSC corresponding with itself receives the second request-reply of AS transmission in the cs domain, the is utilized The voice medium SDP for the current hang-up user for including in two request-replies establishes the calling with hang-up user in the domain CS.

Wherein AS sends second request-reply after updating the voice medium SDP for hanging up user, and by described in and hangs The calling for playing user is continuously maintained at suspended state.

Step 503, when receiving the second conversation end request of AS transmission, disconnect in ps domain and hang up the company of user It connects.

Wherein AS sends the second conversation end request after sending second request-reply.

Step 504, when receiving the second notification message that the MSC is sent, know exhale associated with calling user Waiting is cried, notifies state to enter the two party call of call waiting in the domain CS.

Wherein the MSC sends the second notification message when receiving the second calling of SCC AC transmission, and second exhales It cries including calling number, calling number is the number of calling user.

Step 505, Xiang Suoshu MSC sends the second notice response, so as to the domain CS connect with the connection of calling user, will be with The calling hung up between user is hung up, so that entering the two party call wait state of call waiting in the domain CS.

Step 506, when receiving the second release message of AS transmission, the ps domain between release and calling user is called.

Wherein AS updates the voice medium SDP of calling user when receiving the second call answering that the MSC is sent, And send second release message.

Fig. 6 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by AS, to match with the method and step in embodiment illustrated in fig. 5, to realize switching Operation.In this embodiment, for state be user terminal ps domain be in call waiting two party call waiting shape State.

Step 601, receive user terminal be sent to hang up user the second connection management request when, update hang up use The voice medium SDP at family.

Wherein user terminal is under the two party call wait state that ps domain is in call waiting, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the second connection management request to user is hung up in the domain CS.

Step 602, into the domain CS, MSC corresponding with user terminal sends the second request-reply, wherein the second request is answered It include the current voice medium SDP for hanging up user in answering, to establish user terminal in the domain CS and to hang up the calling of user, and will User terminal and the calling hung up between user are continuously maintained at suspended state.

Step 603, the request of the second conversation end is sent to user terminal, is used so that user terminal is disconnected in ps domain and hang-up The connection at family.

Step 604, the second calling is sent to user terminal in the domain CS, wherein the second calling includes calling number and the domain CS road By code, calling number is the number of calling user, and the route code of the domain CS is used for can be by the second call routing to the MSC.

So as to the MSC according to second calling, to user terminal send second notification message so that user terminal know with The associated Call Waiting of communication user notifies state in the two party call that the domain CS enters call waiting.

Step 605, when receiving the second call answering that the MSC is sent, the voice medium of calling user is updated SDP。

Wherein the MSC receive user terminal transmission second notice response when, in the domain CS connecting subscribers participating terminal with The connection of calling user by user terminal and hangs up the calling hang-up between user, so that user terminal enters calling in the domain CS The two party call wait state of latency services, and send second call answering.

Step 606, the second release message is sent to user terminal, to discharge the PS between user terminal and calling user Domain calling.

Fig. 7 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by user terminal.In this embodiment, for state be user terminal at ps domain In the holding two party call state of third-party call business.For example, user terminal A and user B are in calling suspended state, user is whole Hold A and user C on call.

Step 701, the request of third connection management is sent to user is hung up in the domain CS, wherein third connection management request includes The route code of AS, so that the request of third connection management can be routed to AS；So that AS is receiving the request of third connection management When, update the voice medium SDP for hanging up user.

Step 702, when MSC corresponding with itself receives the third request-reply of AS transmission in the cs domain, the is utilized The voice medium SDP for the current hang-up user for including in three request-replies establishes the calling with hang-up user in the domain CS.Wherein AS Send the third request-reply after updating the voice medium SDP for hanging up user, and by it is described with hang up the calling of user after It is continuous to maintain suspended state.

Step 703, when receiving the third conversation end request of AS transmission, disconnect in ps domain and hang up the company of user It connects.

Wherein AS sends the third conversation end request after sending the third request-reply.

Step 704, third notice message is sent to the MSC in the domain CS, to connect in the cs domain and calling user Connection, and the MSC is made to send third calling to calling user, wherein third calling includes the route code of AS, so that third Calling can be routed to AS.

Step 705, when receiving the third release message of AS transmission, the ps domain between release and calling user is connected.

Wherein AS updates the voice medium SDP of calling user in the third calling for receiving MSC transmission, by current talking The voice medium SDP of user is sent to the MSC, and sends the third release message.

So that the third-party call business of user terminal are switched to the domain CS by ps domain.

Fig. 8 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by AS, to match with the method and step in embodiment illustrated in fig. 7, to realize switching Operation.In this embodiment, for state be holding two party call shape that user terminal is in ps domain third-party call business State.

Step 801, receive user terminal be sent to hang up user third connection management request when, update hang up use The voice medium SDP at family.

Wherein user terminal is in the case where ps domain is in the holding two party call state of third-party call business, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the third connection management request to user is hung up in the domain CS.

Step 802, into the domain CS, MSC corresponding with user terminal sends third request-reply, and wherein third request is answered It include the current voice medium SDP for hanging up user in answering, to establish user terminal in the domain CS and to hang up the calling of user, and will User terminal and the calling hung up between user are continuously maintained at suspended state.

Step 803, the request of third conversation end is sent to user terminal, is used so that user terminal is disconnected in ps domain and hang-up The connection at family.

Step 804, when receive MSC be sent to calling user third calling when, update the voice medium of calling user SDP。

Wherein MSC is connected and calling user in the cs domain when receiving the third notice message of user terminal transmission Connection, and send the third calling.

Step 805, Xiang Suoshu MSC sends third call answering, described so that the SDP of current talking user to be supplied to MSC。

Step 806, third release message is sent to user terminal, to discharge the PS between user terminal and calling user Domain connection.

Fig. 9 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.Preferably, The method and step of the present embodiment can be executed by user terminal.In this embodiment, for state be user terminal at ps domain In the third-party call state of third-party call business.For example, user terminal A and user B and user C are in tripartite talks call shape State.

Step 901, the request of the 4th connection management is sent to specified session participant in the domain CS, wherein the 4th connection management is asked The route code including AS is asked, so that the request of the 4th connection management can be routed to AS.

So that AS is when receiving the request of the 4th connection management, the voice medium SDP of Conference server is updated.

Step 902, when MSC corresponding with itself receives four request-reply of AS transmission in the cs domain, the is utilized The voice medium SDP for the current hang-up user for including in four request-replies connects the connection with Conference server in the domain CS.

Step 903, when receiving the 4th conversation end request of AS transmission, the company in ps domain and Conference server is disconnected It connects.

Wherein AS sends the 4th conversation end request after sending the 4th request-reply.

To which user terminal can connect the connection between tripartite talks server in the domain CS.

Figure 10 is the schematic diagram for the another embodiment of method that call business is switched to the domain CS from ps domain by the present invention.It is preferred that , the method and step of the present embodiment can be executed by AS, to match with the method and step in embodiment illustrated in fig. 9, to realize Handover operation.In this embodiment, for state be third-party call shape that user terminal is in ps domain third-party call business State.

Step 1001, receive user terminal be sent to specified session participant the 4th connection management request when, more The voice medium SDP of new meeting server.

Wherein user terminal is under the third-party call state that ps domain is in third-party call business, if the network signal of ps domain is strong Degree is less than predetermined threshold, then sends the 4th connection management request to specified session participant in the domain CS.

Step 1002, into the domain CS, MSC corresponding with user terminal sends the 4th request-reply, wherein the 4th request is answered The voice medium SDP including active conference server is answered, so that user terminal connects the connection with Conference server in the domain CS.

Step 1003, the request of the 4th conversation end is sent to user terminal, so that user terminal is disconnected in ps domain and meeting The connection of server.

Figure 11 is the schematic diagram of user terminal one embodiment of the present invention.As shown in figure 11, user terminal includes that detection is single Member 1101, first interface unit 1102 and switch unit 1103.Wherein:

Detection unit 1101, in the state that ps domain has call business, the network signal intensity for detecting ps domain to be It is no to be less than predetermined threshold；

First interface unit 1102, for the testing result according to detection unit 1101, if the network signal intensity of ps domain Less than predetermined threshold, then connection management request is sent to application server AS in the domain CS, so as in the foundation of the domain CS and call business The connection of participant.

Switch unit 1103 disconnects when for receiving the conversation end request of AS transmission when first interface unit 1102 In the connection of ps domain and call business participant, call business is switched to the domain CS from ps domain to realize.

Based on the user terminal that call business is switched to the domain CS from ps domain that the above embodiment of the present invention provides, can be not necessarily to The function and interface protocol of existing net MSC are upgraded, it also can faster, for greater flexibility in the case where LTE is not up to all standing LTE voice service is provided.

Processing of the user terminal under each state is specifically described below.

In one embodiment, above-mentioned state is that the two party call for being in call waiting in ps domain notifies state.

First interface unit 1102 specifically sends the request of the first connection management to calling user in the domain CS, wherein the first connection Management request includes the route code of AS, so that the request of the first connection management can be routed to AS；So that AS is receiving first When connection management is requested, the voice medium SDP of calling user is updated.

The specific moving exchanging center MSC corresponding with user terminal in the cs domain of switch unit 1103 receives AS transmission The first request-reply when, using the voice medium SDP for the current talking user for including in the first request-reply, connected in the domain CS With the connection of calling user；Wherein AS sends first request-reply after the voice medium SDP for updating calling user；When When one interface unit 1102 receives the first conversation end request of AS transmission, the connection in ps domain and calling user is disconnected；Its Middle AS sends the first conversation end request after sending first request-reply.

Preferably, switch unit 1103 is also used to lead to when first interface unit 1102 receives the first of the MSC transmission When knowing message, Call Waiting associated with user is waited is known, to enter the two party call of call waiting in the domain CS Notice state；Wherein the MSC sends first notification message, the first calling packet after the first calling for receiving AS transmission Calling number is included, calling number is the number for waiting user；When first interface unit 1102 receives the first release of AS transmission When message, the ps domain between release and waiting user is called, and wherein AS is when receiving the first call answering that the MSC is sent Send first release message.

In one embodiment, above-mentioned state is to be in the two party call wait state of call waiting in ps domain.

First interface unit 1102 specifically sends the request of the second connection management to user is hung up in the domain CS, wherein the second connection Management request includes the route code of AS, so that the request of the second connection management can be routed to AS；So that AS is receiving second When connection management is requested, the voice medium SDP for hanging up user is updated.

The specific MSC corresponding with itself in the cs domain of switch unit 1103 receives the second request-reply of AS transmission When, using the voice medium SDP for the current hang-up user for including in the second request-reply, is established in the domain CS and hang up exhaling for user It cries；Wherein AS sends second request-reply after the voice medium SDP that user is hung up in update, and will described and hang-up user Calling be continuously maintained at suspended state；When first interface unit 1102 receives the second conversation end request of AS transmission, Disconnect in ps domain and hang up the connection of user；Wherein AS sends second conversation end after sending second request-reply Request.

Preferably, switch unit 1103 is also used to lead to when first interface unit 1102 receives the second of the MSC transmission When knowing message, Call Waiting associated with calling user is known, to enter the two party call of call waiting in the domain CS Notice state；Wherein the MSC sends the second notification message when receiving the second calling of SCC AC transmission, and second exhales It cries including calling number, calling number is the number of calling user；Indicate that first interface unit 1102 sends second to the MSC Notify response；When first interface unit 1102 receives the second release message of AS transmission, between release and calling user Ps domain calling；Wherein AS updates the voice medium SDP of calling user when receiving the second call answering that the MSC is sent, And send second release message.

First interface unit 1102 is also used to the instruction according to switch unit 1103, and Xiang Suoshu MSC sends the second notice and answers It answers, to connect the connection with calling user in the domain CS, the calling between user will be hung up and hung up, exhaled so that entering in the domain CS It is the two party call wait state of latency services.

In one embodiment, above-mentioned state is to be in the holding two party call state of third-party call business in ps domain.

First interface unit 1102 specifically sends the request of third connection management to user is hung up in the domain CS, and wherein third connects Management request includes the route code of AS, so that the request of third connection management can be routed to AS；So that AS is receiving third When connection management is requested, the voice medium SDP for hanging up user is updated.

The specific MSC corresponding with itself in the cs domain of switch unit 1103 receives the third request-reply of AS transmission When, using the voice medium SDP for the current hang-up user for including in third request-reply, is established in the domain CS and hang up exhaling for user It cries；Wherein AS sends the third request-reply after the voice medium SDP that user is hung up in update, and will described and hang-up user Calling be continuously maintained at suspended state；When first interface unit 1102 receives the third conversation end request of AS transmission, Disconnect in ps domain and hang up the connection of user；Wherein AS sends the third conversation end after sending the third request-reply Request.

Preferably, switch unit 1103 is also used to after the connection for disconnecting in ps domain and hanging up user, in the domain CS to described MSC sends third notice message, to connect the connection with calling user in the cs domain, and makes the MSC to calling user Third calling is sent, wherein third calling includes the route code of AS, so that third calling can be routed to AS；In first interface When unit 1103 receives the third release message of AS transmission, the ps domain between release and calling user is connected；Wherein AS is connecing The voice medium SDP that calling user is updated when the third calling of MSC transmission is received, by the voice medium SDP of current talking user It is sent to the MSC, and sends the third release message.

First interface unit 1102 is also used to the instruction according to switch unit 1103, sends third to calling user in the domain CS Notification message, wherein third notice message includes the route code of AS, and third notice message is enabled to be routed to AS；So as to AS When receiving third notice message, the voice medium SDP of calling user is updated.

In one embodiment, above-mentioned state is to be in the third-party call state of third-party call business in ps domain.

First interface unit 1102 specifically sends the request of the 4th connection management to specified session participant in the domain CS, wherein the The request of four connection managements includes the route code of AS, so that the request of the 4th connection management can be routed to AS；So that AS is being received To when the request of the 4th connection management, the voice medium SDP of Conference server is updated.

The specific MSC corresponding with itself in the cs domain of switch unit 1103 receives the 4th request-reply of AS transmission When, using the voice medium SDP for the current hang-up user for including in the 4th request-reply, connected and Conference server in the domain CS Connection；When first interface unit 1102 receives the 4th conversation end request of AS transmission, disconnect in ps domain and conference service The connection of device；Wherein AS sends the 4th conversation end request after sending the 4th request-reply.

Figure 12 is the schematic diagram of application server one embodiment of the present invention.As shown in figure 12, application server includes the Two interface units 1201 connect control unit 1202.Wherein:

Second interface unit 1201, for receiving the connection management request of user terminal transmission；Wherein user terminal is in PS When domain is less than predetermined threshold with the network signal intensity of call business and ps domain, the connection management request is sent；According to even The instruction for connecing control unit 1202 sends conversation end request to user terminal, so that user terminal is disconnected in ps domain and calling The call business of user terminal is switched to the domain CS from ps domain to realize by the connection of business participant.

Control unit 1202 is connected, the connection management for receiving user terminal transmission in second interface unit 1201 is asked When asking, the connection of user terminal Yu call business participant is established in the domain CS, indicates second interface unit 1201 to user terminal Send conversation end request.

It, can be without to existing net based on the AS that call business is switched to the domain CS from ps domain that the above embodiment of the present invention provides The function and interface protocol of MSC is upgraded, in the case where LTE is not up to all standing also can faster, LTE is provided for greater flexibility Voice service.

In one embodiment, above-mentioned state is the two party call notice that user terminal is in call waiting in ps domain State.

Connection control unit 1202 specifically receives user terminal in second interface unit 1201 and is sent to calling user When first connection management is requested, the voice medium SDP of calling user is updated；Wherein user terminal is in Call Waiting industry in ps domain Under the two party call notice state of business, if the network signal intensity of ps domain is less than predetermined threshold, sent out in the domain CS to calling user First connection management is sent to request；Indicate the mobile switch corresponding with user terminal into the domain CS of second interface unit 1201 Center MSC sends the first request-reply, so that user terminal utilizes the language for the current talking user for including in the first request-reply Sound media SDP connects the connection with calling user in the domain CS；Indicate that second interface unit 1201 sends the first meeting to user terminal Ending request is talked about, so that user terminal disconnects the connection in ps domain and calling user.

Preferably, second interface unit 1201 is also used to after sending the request of the first conversation end to user terminal, in CS Domain sends the first calling to user terminal, wherein the first calling includes calling number and the route code of the domain CS, calling number is to wait The number of user, the route code of the domain CS is used for can be by the first call routing to the MSC；So that the MSC is called according to first, The first notification message is sent to user terminal, so that user terminal knows Call Waiting associated with user is waited, in the domain CS Two party call into call waiting notifies state；When receiving the first call answering that the MSC is sent, to user Terminal sends the first release message, to discharge user terminal and the ps domain between user to be waited to call, wherein the MSC is being sent out First call answering is sent after sending first notification message.

In one embodiment, above-mentioned state is that user terminal is waited in the two party call that ps domain is in call waiting State.

Connection control unit 1202 specifically receives user terminal in second interface unit 1201 and is sent to hang-up user's When second connection management is requested, the voice medium SDP for hanging up user is updated；Wherein user terminal is in Call Waiting industry in ps domain Under the two party call wait state of business, if the network signal intensity of ps domain is less than predetermined threshold, sent out in the domain CS to user is hung up Second connection management is sent to request；Indicate that the MSC corresponding with user terminal into the domain CS of second interface unit 1201 is sent Second request-reply is used wherein including the current voice medium SDP for hanging up user in the second request-reply to establish in the domain CS Family terminal and the calling for hanging up user, and the calling between user terminal and hang-up user is continuously maintained at suspended state；Refer to Show that second interface unit 1201 sends the request of the second conversation end to user terminal, so that user terminal is disconnected in ps domain and is hung up The connection of user.

Preferably, second interface unit 1201 is also used to after sending the request of the second conversation end to user terminal, in CS Domain sends the second calling to user terminal, wherein the second calling includes calling number and the route code of the domain CS, calling number is call The number of user, the route code of the domain CS is used for can be by the second call routing to the MSC；So that the MSC is called according to second, Second notification message is sent to user terminal, so that user terminal knows Call Waiting associated with communication user, in the domain CS Two party call into call waiting notifies state.

Connection control unit 1202 is also used to answer when second interface unit 1201 receives the second calling that the MSC is sent When answering, the voice medium SDP of calling user is updated；Wherein the MSC is in the second notice response for receiving user terminal transmission When, in the connection of the domain CS connecting subscribers participating terminal and calling user, by user terminal and the calling hang-up between user is hung up, so that User terminal enters the two party call wait state of call waiting in the domain CS, and sends second call answering；Instruction Second interface unit 1201 sends the second release message to user terminal, to discharge the PS between user terminal and calling user Domain calling.

In one embodiment, above-mentioned state is the holding two party call that user terminal is in third-party call business in ps domain State.

Connection control unit 1202, which is also used to receive user terminal in second interface unit 1201, is sent to hang-up user Third connection management request when, update hang up user voice medium SDP；Wherein user terminal is in third-party call in ps domain Under the holding two party call state of business, if the network signal intensity of ps domain be less than predetermined threshold, the domain CS to hang up user Send the third connection management request；Indicate the MSC hair corresponding with user terminal into the domain CS of second interface unit 1201 Third request-reply is sent, wherein includes the current voice medium SDP for hanging up user in third request-reply, to be established in the domain CS User terminal and the calling for hanging up user, and the calling between user terminal and hang-up user is continuously maintained at suspended state； Second interface unit is indicated to user terminal transmission third conversation end request, so that user terminal is disconnected in ps domain and hangs up use The connection at family.

Preferably, connection control unit 1202 is also used to be sent to call use when second interface unit 1201 receives MSC When the third calling at family, the voice medium SDP of calling user is updated, wherein MSC is logical in the third for receiving user terminal transmission When knowing message, the connection with calling user is connected in the cs domain, and sends the third calling；Indicate second interface unit 1201 Third call answering is sent to the MSC, so that the SDP of current talking user is supplied to the MSC；Indicate second interface list Member 1201 sends third release message to user terminal, to discharge the connection of the ps domain between user terminal and calling user.

In one embodiment, above-mentioned state is the third-party call shape that user terminal is in third-party call business in ps domain State.

Connection control unit 1202 is specifically in the 4th connecting tube for receiving user terminal and being sent to specified session participant When reason request, the voice medium SDP of Conference server is updated；Wherein user terminal is in the tripartite of third-party call business in ps domain Under call state, if the network signal intensity of ps domain is less than predetermined threshold, in the domain CS to described in the transmission of specified session participant The request of 4th connection management；Indicate that the MSC corresponding with user terminal into the domain CS of second interface unit 1201 sends the 4th and ask Response is asked, wherein the 4th request-reply includes the voice medium SDP of active conference server, so that user terminal is connected in the domain CS With the connection of Conference server；Indicate second interface unit 1201 to user terminal send the 4th conversation end request, so as to Family terminal disconnects the connection in ps domain and Conference server.

Figure 13 is the schematic diagram of system one embodiment that call business is switched to the domain CS by the present invention from ps domain.Such as Figure 13 Shown, which includes user terminal 1301 and application server 1302.For example, user terminal 1301 can be DVRCC terminal, Application server 1302 can be SCC AS.In one embodiment, user terminal 1301 can be any embodiment in Figure 11 The user terminal being related to, the application server that application server 1302 can be related to for any embodiment in Figure 12.

Below by specific example, the present invention will be described.In the following embodiments, as an example, user terminal UE For DRVCC terminal, mobile switching centre MSCe, application server is SCC AS.

Figure 14 is the schematic diagram that calling class service of the present invention switches one embodiment.In this embodiment, UE A is in ps domain Two party call in call waiting notifies state, and wherein UE A and user B has the session Y of an activation, receives user C The waiting of incoming call session X notifies that two sessions are all anchored on SCC AS.SCC AS stores user C and is sent to UE in ps domain The SDP of A calling.

1, UE A determines triggering switching according to the variation of LTE wireless network signal power.

2, UE A initiates the connection management (CM) request in the domain CS, and called number IMRN+B, IMRN are to the road of SCC AS By code.MSCe carries out channel assignment for this call request.

3, MSCe initiates calling, and called number is the IMRN+B that UE A is transmitted, and cdma network will be called according to IMRN number It is routed to the MGCF of IMS network.

4, MGCF receives the calling that cdma network is sent, and routes the call to the S-CSCF of IMS network.

5, S-CSCF carries out iFC triggering according to the IMRN of called number, selects corresponding SCC AS.

6, S-CSCF routes the call to the corresponding SCC AS of IMRN.

7, SCC AS judges that UE A will be into according to the caller (UE A) of the call information received and called party information (IMRN+B) The switching of row PS to CS, and according to current UE A state in which (two party call of call waiting notifies state), SCC AS determines the voice medium SDP updated to distal end (i.e. user B).

8, SCC AS initiates to the session updates of B to request, and sends reINVITE message to S-CSCF, the caller SDP of session It is the SDP of this calling distribution for MSCe.

9, S-CSCF routes the call to user B by IMS network.

10-13, user's B automatic-answering back device, and the negotiation of SDP is completed, update voice medium address.

14-16, SCC AS return to the voice medium SDP of user B to MSCe automatic-answering back device.UE A is connected in the domain CS at this time Connection between B, the connection completed between user B are switched to the domain CS from ps domain.

17, SCC AS initiates conversation end request to UE A, disconnects A in the connection of ps domain and user B.

The calling Y between UE A and user B goes to the domain CS at this time, and ps domain between UE A and user C calling X is after renewing User C keeps ringing condition.

18, according to the state of current UE A, (switching from PS to CS, A and C have been completed in the connection between A and B to SCC AS Between connection still in ps domain) determine by the connection between A and C from ps domain switch the domain CS.SCC AS is exhaled to from the domain CS to A initiation It cries, the calling number of calling is C, and called number CSRN+A, CSRN are the route code for routing the call to the domain CS, calling The user C that SDP is stored before being SCC AS issues the SDP of the calling of UE A in ps domain.

19-20, IMS network and cdma network route the call to cdma network and final call routing according to CSRN MSCe to where UE A.

21, due to having been set up calling between UE A and user B, MSCe sends the message that information prompts to UE A, Message informing UE A currently has a Call Waiting (calling number C), and such UE A has entered Call Waiting in the domain CS The two party call of business notifies state.The call waiting of user is transferred to the MSCe in the domain CS by the IMS of ps domain to control at this time System.

22-24, MSCe response calling return to ALERTING message to SCC AS.

25, SCC AS sends the ps domain calling between Cancel message release UE A and user C to UE A.

The calling X between UE A and user C also goes to the domain CS at this time, and UE A and user B continues to converse in the domain CS, user C Keep ringing condition.

Figure 15 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UE A is in and exhales The two party call wait state for being latency services has the session Y of a hang-up between user B, has one to swash between user C Session X living, two sessions are all anchored on SCC AS.SCC AS stores user C and issues the calling of UE A in ps domain SDP。

1, UE A determines triggering switching flow according to the variation of LTE wireless network signal power.

2, UE A initiates CM request in the domain CS, and called number IMRN+B, IMRN are the route code to SCC AS.MSCe needle Channel assignment is carried out to this call request.

6, S-CSCF routes the call to the corresponding SCC AS of IMRN.

7, SCC AS judges that UE A will be into according to the caller (UE A) of the call information received and called party information (IMRN+B) Row ps domain is to the switching in the domain CS, and (two party call of call waiting waits shape according to current UE A state in which State), SCC AS determines the voice medium SDP updated to distal end (i.e. user B).

8, SCC AS initiates to the session updates of user B to request, and sends reINVITE message to S-CSCF, the caller of session SDP is the SDP that MSCe is this calling distribution.

9, S-CSCF routes the call to user B by IMS network.

10-13, user's B automatic-answering back device, and the negotiation of SDP is completed, update voice medium SDP.

14-16, SCC AS return to the voice medium SDP of user B to MSCe automatic-answering back device.UE A and disconnect CS at this time Calling between domain and user B, but continue to turn on the calling between ps domain and user C.

The calling Y between UE A and user B goes to the domain CS at this time, and the ps domain calling between UE A and user C exists, UE A continues to turn on the connection between ps domain and user C, and SCC AS continues to the extension of the calling between UE A and user B at this time The state of rising.

18, according to the state of current UE A, (connection between UE A and user B has been transformed into CS from ps domain to SCC AS Domain, the connection between UE A and user C is still in ps domain) it determines the connection between UE A and user C switching the domain CS from ps domain. SCC AS initiates to call to from the domain CS to UE A, and the calling number of calling is C, and called number CSRN+A, CSRN are that will call It is routed to the route code in the domain CS, the user C that the SDP of calling is stored before being SCC AS issues the SDP of the calling of UE A in ps domain.

22-24, MSCe response calling return to ALERTING message to SCC AS.

25, the message of UE A automatic-answering back device information prompt, MSCe connect the calling between UE A and user C, and will Calling between UE A and user B is hung up.UE A turns on the connection between the domain CS and user C and completes from ps domain to the domain CS at this time Switching, UE A entered the two party call wait state of call waiting in the domain CS.

26-28, MSCe return to response message to SCC AS, and response message is included as the SDP that MSCe is this calling distribution.

29, it after SCC AS receives the response that MSCe is returned, initiates to the session updates of user C to request.

It is this calling distribution that 30-35, SCC AS transmission reINVITE message, which are MSCe to user C, the caller SDP of session, SDP.The update of user's C automatic-answering back device completion SDP.

36, SCC AS sends the ps domain calling between Cancel message release A and C to UE A.

The calling X between UE A and user C also goes to the domain CS at this time, and UE A and user C are in CS domain call, UE A and user The calling Y of B is in suspended state in the domain CS.

Figure 16 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UE A is in three The holding two party call state of party call business has the session Y of a hang-up between user B, has one to swash between user C Session X living, two sessions are all anchored on SCC AS.

6, S-CSCF routes the call to the corresponding SCC AS of IMRN.

7, SCC AS judges that UE A will be into according to the caller (UE A) of the call information received and called party information (IMRN+B) The switching of row PS to CS, and according to current UE A state in which (the holding two party call state of third-party call business), SCC AS determines the voice medium SDP updated to distal end (i.e. user B).

9, S-CSCF routes the call to user B by IMS network.

14-16, SCC AS return to the voice medium SDP of user B to MSCe automatic-answering back device.UE A and disconnect CS at this time Calling between domain and B, but continue to turn on the calling between ps domain and C.

17, SCC AS initiates conversation end request to UE A, disconnects A in the connection of ps domain and B.

The calling Y between UE A and B goes to the domain CS at this time, and the ps domain calling between UE A and C exists, and UE A continues The connection between ps domain and user C is turned on, SCC AS continues to the calling suspended state between UE A and B at this time.

18, UE A initiates the message of information prompt, starting third-party call to C (called number IMRN+C) in the domain CS. UE A turn on the connection between the domain CS and user C complete switching, at this time the third-party call Service control of UE A by ps domain IMS Hand to the MSC in the domain CS.

19, MSCe initiates calling, and called number is the IMRN+C that UE A is transmitted, and cdma network will be called according to IMRN number It is routed to the MGCF of IMS network.

20, MGCF receives the calling that cdma network is sent, and routes the call to the S-CSCF of IMS network.

21, S-CSCF carries out iFC triggering according to the IMRN of called number, selects corresponding SCC AS.

22, S-CSCF routes the call to the corresponding SCC AS of IMRN.

23, SCC AS judges that UE A will be according to the caller (UE A) of the call information received and called party information (IMRN+C) Calling between C carries out the switching of PS to CS, and according to current UE A state in which (connection between A and B from Ps domain is transformed into the domain CS, and the connection between A and C is still in ps domain), SCC AS determines the voice matchmaker updated to distal end (i.e. user C) Body SDP.

24, SCC AS initiates to the session updates of C to request, and sends reINVITE message to S-CSCF, the caller SDP of session It is the SDP of this calling distribution for MSCe.

25, S-CSCF routes the call to user C by IMS network.

26-29, user's C automatic-answering back device, and the negotiation of SDP is completed, update voice medium SDP.

30-32, SCC AS return to the voice medium SDP of user C to MSCe automatic-answering back device.

33, SCC AS initiates conversation end request to UE A, disconnects A in the connection of ps domain and C.

The calling X between UE A and C also goes to the domain CS at this time, and UE A and C is in CS domain call, and the calling Y of UE A and B are in CS Domain is in suspended state.

Figure 17 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UE A is in three Have between the third-party call state of party call business, with Conference server (CONF AS) a session X, user B and user C with There are Y and Z between CONF AS.

6, S-CSCF routes the call to the corresponding SCC AS of IMRN.

7, SCC AS judges that UE A will be into according to the caller (UE A) of the call information received and called party information (IMRN+B) The switching of row PS to CS, and according to current UE A state in which (the third-party call state of third-party call business), SCC AS Determine the voice medium SDP updated to distal end (i.e. CONF AS).

8, SCC AS initiates to the session updates of CONF AS to request, transmission reINVITE message to CONF AS, session Caller SDP is the SDP that MSCe is this calling distribution.

9-10, CONF AS automatic-answering back device complete the negotiation of SDP, the more SDP of new session X.

11-13, SCC AS return to the voice medium SDP of CONF AS to MSCe automatic-answering back device.UE A connect the domain CS with Calling between CONF AS is completed from ps domain to the switching in the domain CS.

14, SCC AS initiates conversation end request to UE A, disconnects A in the connection of ps domain and CONF AS.

The calling X between UE A and CONF AS goes to the domain CS at this time, and the third-party call business of UE A continues by ps domain IMS is provided.

By applying the present invention, the existing net MSCe of CDMA operator can not have to upgrading, avoiding MSC in international standard must The problem of must carrying out function and interface upgrade, so that CDMA operator can carry out LTE voice service quickly, for greater flexibility, And reduce investment and the influence to existing net.

Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..

Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage The solution present invention is to design various embodiments suitable for specific applications with various modifications.

Claims

1. a kind of method for call business to be switched to the domain CS from ps domain characterized by comprising

In the state that packet switched ps domain has call business, whether the network signal intensity for detecting ps domain is less than predetermined door Limit；

If the network signal intensity of ps domain is less than predetermined threshold, connecting tube is sent to application server AS in circuit-switched CS domain Reason request, to establish the connection with call business participant in the domain CS；

When receiving the conversation end request of AS transmission, the connection in ps domain and call business participant is disconnected, to realize Call business is switched to the domain CS from ps domain；

It wherein, is in the case where ps domain is in the two party call notice state of call waiting, in the domain CS in the state Connection management request is sent to AS, includes: the step of the connection with call business participant to be established in the domain CS

The request of the first connection management is sent to calling user in the domain CS, wherein the request of the first connection management includes the route code of AS, So that the request of the first connection management can be routed to AS；So that AS is when receiving the request of the first connection management, call is updated The voice medium SDP of user；

When moving exchanging center MSC corresponding with itself receives the first request-reply of AS transmission in the cs domain, the is utilized The voice medium SDP for the current talking user for including in one request-reply connects the connection with calling user in the domain CS；Wherein AS First request-reply is sent after the voice medium SDP for updating calling user；

When receiving the conversation end request of AS transmission, disconnection is wrapped in the step of ps domain and the connection of call business participant It includes:

When receiving the first conversation end request of AS transmission, the connection in ps domain and calling user is disconnected；Wherein AS is being sent out The first conversation end request is sent after sending first request-reply.

2. the method according to claim 1, wherein

After disconnecting the connection of ps domain and calling user the step of, further includes:

When receiving the first notification message that the MSC is sent, Call Waiting associated with user is waited is known, thus The domain CS enters the two party call notice state of call waiting；Wherein the MSC is after receiving the first calling of AS transmission First notification message is sent, the first calling includes calling number, and calling number is the number for waiting user；

When receiving the first release message of AS transmission, the ps domain between release and waiting user is called, and wherein AS is being received To the MSC send the first call answering when send first release message.

3. the method according to claim 1, wherein

It is to be sent out in the domain CS to AS in the case where ps domain is in the two party call wait state of call waiting in the state Connection management is sent to request, so as to the step of the domain CS is established with the connection of call business participant further include:

The request of the second connection management is sent to user is hung up in the domain CS, wherein the request of the second connection management includes the route code of AS, So that the request of the second connection management can be routed to AS；So that AS is when receiving the request of the second connection management, updates and hang up The voice medium SDP of user；

When MSC corresponding with itself receives the second request-reply of AS transmission in the cs domain, using in the second request-reply Including current hang-up user voice medium SDP, the domain CS establish with hang up user calling；Wherein AS is updating hang-up use Second request-reply is sent after the voice medium SDP at family, and is continuously maintained at hang-up with calling that is hanging up user for described State；

When receiving the second conversation end request of AS transmission, the connection of user is disconnected in ps domain and hung up；Wherein AS is being sent out The second conversation end request is sent after sending second request-reply.

4. according to the method described in claim 3, it is characterized in that,

After the step of disconnecting in ps domain and hang up the connection of user, further includes:

When receiving the second notification message that the MSC is sent, know Call Waiting associated with calling user, so as to The domain CS enters the two party call notice state of call waiting；Wherein the MSC is receiving service centralization and continuity The second notification message is sent when the second calling that application server SCC AS is sent, the second calling includes calling number, main Code of calling out the numbers is the number of calling user；

The second notice response is sent to the MSC, it, will be between hang-up user to connect the connection with calling user in the domain CS Calling hang up so that entering the two party call wait state of call waiting in the domain CS；

When receiving the second release message of AS transmission, the ps domain between release and calling user is called；Wherein AS is being received To the MSC send the second call answering when, update the voice medium SDP of calling user, and send it is described second release disappear Breath.

5. the method according to claim 1, wherein

It is to be sent out in the domain CS to AS in the case where ps domain is in the holding two party call state of third-party call business in the state Connection management is sent to request, so as to the step of the domain CS is established with the connection of call business participant further include:

The request of third connection management is sent to user is hung up in the domain CS, wherein the request of third connection management includes the route code of AS, So that the request of third connection management can be routed to AS；So that AS is when receiving the request of third connection management, updates and hang up The voice medium SDP of user；

When MSC corresponding with itself receives the third request-reply of AS transmission in the cs domain, using in third request-reply Including current hang-up user voice medium SDP, the domain CS establish with hang up user calling；Wherein AS is updating hang-up use The third request-reply is sent after the voice medium SDP at family, and is continuously maintained at hang-up with calling that is hanging up user for described State；

When receiving the third conversation end request of AS transmission, the connection of user is disconnected in ps domain and hung up；Wherein AS is being sent out The third conversation end request is sent after sending the third request-reply.

6. according to the method described in claim 5, it is characterized in that,

Third notice message is sent to the MSC in the domain CS, to connect the connection with calling user in the cs domain, and makes institute It states MSC and sends third calling to calling user, wherein third calling includes the route code of AS, so that third calling can be routed To AS；

When receiving the third release message of AS transmission, the ps domain between release and calling user is connected；Wherein AS is being received The third sent to the MSC updates the voice medium SDP of calling user when calling, by the voice medium of current talking user SDP is sent to the MSC, and sends the third release message.

7. the method according to claim 1, wherein

It is to send and connect to AS in the domain CS in the case where ps domain is in the third-party call state of third-party call business in the state Adapter tube reason request, so as to the step of the domain CS is established with the connection of call business participant further include:

The request of the 4th connection management is sent to specified session participant in the domain CS, wherein the request of the 4th connection management includes the road of AS By code, so that the request of the 4th connection management can be routed to AS；So that AS is when receiving the request of the 4th connection management, update The voice medium SDP of Conference server；

When MSC corresponding with itself receives four request-reply of AS transmission in the cs domain, using in the 4th request-reply Including current hang-up user voice medium SDP, connected and the connection of Conference server in the domain CS；

When receiving the 4th conversation end request of AS transmission, the connection in ps domain and Conference server is disconnected；Wherein AS exists The 4th conversation end request is sent after sending the 4th request-reply.

8. a kind of method for call business to be switched to the domain CS from ps domain characterized by comprising

In the connection management request for receiving user terminal transmission, user terminal and call business are established in circuit-switched CS domain The connection of participant；Wherein user terminal in packet switched ps domain there is the network signal intensity of call business and ps domain to be less than When predetermined threshold, the connection management request is sent；

Conversation end request is sent to user terminal, so that user terminal disconnects the connection in ps domain and call business participant, The call business of user terminal is switched to the domain CS from ps domain to realize；

Wherein, in the connection management request for receiving user terminal transmission, user terminal is established in the domain CS and call business is joined Include: with the step of square connection

Receive user terminal be sent to calling user the first connection management request when, update the voice medium of calling user SDP；Wherein user terminal is in the case where ps domain is in the two party call notice state of call waiting, if the network signal of ps domain is strong Degree is less than predetermined threshold, then sends the first connection management request to calling user in the domain CS；

Into the domain CS, moving exchanging center MSC corresponding with user terminal sends the first request-reply, so as to user terminal benefit With the voice medium SDP for the current talking user for including in the first request-reply, the connection with calling user is connected in the domain CS；

Conversation end request is sent to user terminal, is connect in ps domain with call business participant so as to user terminal disconnection Step includes:

The request of the first conversation end is sent to user terminal, so that user terminal disconnects the connection in ps domain and calling user.

9. according to the method described in claim 8, it is characterized in that,

After sending the step of the first conversation end is requested to user terminal, further includes:

The first calling is sent to user terminal in the domain CS, wherein the first calling includes calling number and the route code of the domain CS, caller number Code is the number for waiting user, and the route code of the domain CS is used for can be by the first call routing to the MSC；So as to the MSC according to First calling sends the first notification message to user terminal, so that user terminal knows calling associated with user is waited etc. To notify state in the two party call that the domain CS enters call waiting；

When receiving the first call answering that the MSC is sent, the first release message is sent to user terminal, to discharge use Family terminal and the ps domain between user is waited to call, wherein the MSC sends described the after sending first notification message One call answering.

10. according to the method described in claim 8, it is characterized in that,

In the connection management request for receiving user terminal transmission, user terminal and call business participant are established in the domain CS The step of connection further include:

Receive user terminal be sent to hang up user the second connection management request when, update hang up user voice medium SDP；Wherein user terminal is under the two party call wait state that ps domain is in call waiting, if the network signal of ps domain is strong Degree is less than predetermined threshold, then sends the second connection management request to user is hung up in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends the second request-reply, wherein including current in the second request-reply The voice medium SDP of user is hung up, to establish user terminal in the domain CS and to hang up the calling of user, and by user terminal and is hung The calling risen between user is continuously maintained at suspended state；

The request of the second conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the connection of user.

11. according to the method described in claim 10, it is characterized in that,

After sending the step of the second conversation end is requested to user terminal, further includes:

The second calling is sent to user terminal in the domain CS, wherein the second calling includes calling number and the route code of the domain CS, caller number Code is the number of calling user, and the route code of the domain CS is used for can be by the second call routing to the MSC；So as to the MSC according to Second calling sends second notification message to user terminal, so that user terminal knows calling associated with communication user etc. To notify state in the two party call that the domain CS enters call waiting；

When receiving the second call answering that the MSC is sent, the voice medium SDP of calling user is updated；The wherein MSC In the second notice response for receiving user terminal transmission, in the connection of the domain CS connecting subscribers participating terminal and calling user, will use Family terminal and the calling hung up between user are hung up, so that user terminal enters the two party call etc. of call waiting in the domain CS To state, and send second call answering；

12. according to the method described in claim 8, it is characterized in that,

Receive user terminal be sent to hang up user third connection management request when, update hang up user voice medium SDP；Wherein user terminal is in the case where ps domain is in the holding two party call state of third-party call business, if the network signal of ps domain is strong Degree is less than predetermined threshold, then sends the third connection management request to user is hung up in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends third request-reply, includes wherein current in third request-reply The voice medium SDP of user is hung up, to establish user terminal in the domain CS and to hang up the calling of user, and by user terminal and is hung The calling risen between user is continuously maintained at suspended state；

The request of third conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the connection of user.

13. according to the method for claim 12, which is characterized in that

After sending the step of third conversation end is requested to user terminal, further includes:

When receive the MSC be sent to calling user third calling when, update the voice medium SDP of calling user, wherein The MSC connects the connection with calling user, concurrently when receiving the third notice message of user terminal transmission in the cs domain The third is sent to call；

14. according to the method described in claim 8, it is characterized in that,

Receive user terminal be sent to specified session participant the 4th connection management request when, update Conference server Voice medium SDP；Wherein user terminal is under the third-party call state that ps domain is in third-party call business, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the 4th connection management request to specified session participant in the domain CS；

Into the domain CS, MSC corresponding with user terminal sends the 4th request-reply, wherein the 4th request-reply includes current meeting The voice medium SDP of server is discussed, so that user terminal connects the connection with Conference server in the domain CS；

The request of the 4th conversation end is sent to user terminal, so that user terminal disconnects the connection in ps domain and Conference server.

15. a kind of for call business to be switched to the user terminal in the domain CS from ps domain, which is characterized in that including detection unit, First interface unit and switch unit, in which:

Detection unit, in the state that packet switched ps domain has call business, the network signal intensity for detecting ps domain to be It is no to be less than predetermined threshold；

First interface unit, for the testing result according to detection unit, if the network signal intensity of ps domain is less than predetermined threshold, Connection management request then is sent to application server AS in circuit-switched CS domain, to establish and call business participant in the domain CS Connection；It is wherein to be used in the case where ps domain is in the two party call notice state of call waiting in the state The request of the first connection management is sent to calling user in the domain CS, wherein the request of the first connection management includes the route code of AS, so that The request of first connection management can be routed to AS；So that AS is when receiving the request of the first connection management, calling user is updated Voice medium SDP；

Switch unit disconnects when for receiving the conversation end request of AS transmission when first interface unit in ps domain and calling Call business is switched to the domain CS from ps domain to realize by the connection of business participant, wherein in the cs domain with user terminal phase When corresponding moving exchanging center MSC receives the first request-reply of AS transmission, worked as using include in the first request-reply The voice medium SDP of preceding calling user connects the connection with calling user in the domain CS；Wherein AS is in the voice for updating calling user First request-reply is sent after media SDP；When first interface unit receives the first conversation end request of AS transmission, Disconnect the connection in ps domain and calling user；Wherein AS sends first conversation end after sending first request-reply Request.

16. user terminal according to claim 15, which is characterized in that

Switch unit is also used to know and wait when first interface unit receives the first notification message that the MSC is sent The associated Call Waiting of user, to notify state in the two party call that the domain CS enters call waiting；The wherein MSC First notification message is sent after the first calling for receiving AS transmission, the first calling includes calling number, calling number For the number for waiting user；When first interface unit receive AS transmission the first release message when, release with wait user it Between ps domain calling, wherein AS sends first release message when receiving the first call answering that the MSC is sent.

17. user terminal according to claim 16, which is characterized in that

First interface unit is also used in the state be to be in the two party call wait state of call waiting in ps domain In the case of, the request of the second connection management is sent to user is hung up in the domain CS, wherein the request of the second connection management includes the routing of AS Code, so that the request of the second connection management can be routed to AS；So that AS is when receiving the request of the second connection management, updates and hang Play the voice medium SDP of user；

Switch unit be also used to MSC corresponding with itself in the cs domain receive AS transmission the second request-reply when, utilize The voice medium SDP for the current hang-up user for including in second request-reply establishes the calling with hang-up user in the domain CS；Wherein AS sends second request-reply after updating the voice medium SDP for hanging up user, and by described with calling that is hanging up user It is continuously maintained at suspended state；When first interface unit receives the second conversation end request of AS transmission, disconnect in ps domain With the connection for hanging up user；Wherein AS sends the second conversation end request after sending second request-reply.

18. user terminal according to claim 17, which is characterized in that

Switch unit is also used to know and converse when first interface unit receives the second notification message that the MSC is sent The associated Call Waiting of user notifies state to enter the two party call of call waiting in the domain CS；The wherein MSC Second notice is sent when receiving the second calling of service centralization and application server for continuity SCC AS transmission to disappear Breath, the second calling include calling number, and calling number is the number of calling user；Instruction first interface unit is sent out to the MSC Send the second notice response；When first interface unit receives the second release message of AS transmission, between release and calling user Ps domain calling；Wherein AS updates the voice medium of calling user when receiving the second call answering that the MSC is sent SDP, and send second release message；

First interface unit is also used to the instruction according to switch unit, and Xiang Suoshu MSC sends the second notice response, so as in the domain CS The connection with calling user is connected, the calling between user will be hung up and hung up, so that entering call waiting in the domain CS Two party call wait state.

19. user terminal according to claim 15, which is characterized in that

First interface unit is also used in the state be to be in the holding two party call state of third-party call business in ps domain In the case of, the request of third connection management is sent to user is hung up in the domain CS, wherein the request of third connection management includes the routing of AS Code, so that the request of third connection management can be routed to AS；So that AS is when receiving the request of third connection management, updates and hang Play the voice medium SDP of user；

Switch unit be also used to MSC corresponding with itself in the cs domain receive AS transmission third request-reply when, utilize The voice medium SDP for the current hang-up user for including in third request-reply establishes the calling with hang-up user in the domain CS；Wherein AS sends the third request-reply after updating the voice medium SDP for hanging up user, and by described with calling that is hanging up user It is continuously maintained at suspended state；When first interface unit receives the third conversation end request of AS transmission, disconnect in ps domain With the connection for hanging up user；Wherein AS sends the third conversation end request after sending the third request-reply.

20. user terminal according to claim 19, which is characterized in that

Switch unit is also used to after the connection for disconnecting in ps domain and hanging up user, sends third notice to the MSC in the domain CS Message to connect the connection with calling user in the cs domain, and makes the MSC send third calling to calling user, Middle third calling includes the route code of AS, so that third calling can be routed to AS；AS hair is received in first interface unit When the third release message sent, the ps domain between release and calling user is connected；Wherein AS is in receive that the MSC sends the The voice medium SDP that calling user is updated when three callings, is sent to the MSC for the voice medium SDP of current talking user, and Send the third release message；

First interface unit is also used to the instruction according to switch unit, sends third notice message to calling user in the domain CS, Middle third notice message includes the route code of AS, and third notice message is enabled to be routed to AS；So that AS is receiving When three notification messages, the voice medium SDP of calling user is updated.

21. user terminal according to claim 15, which is characterized in that

First interface unit is also used in the state be the case where ps domain is in the third-party call state of third-party call business Under, the request of the 4th connection management is sent to specified session participant in the domain CS, wherein the request of the 4th connection management includes the road of AS By code, so that the request of the 4th connection management can be routed to AS；So that AS is when receiving the request of the 4th connection management, update The voice medium SDP of Conference server；

Switch unit be also used to MSC corresponding with itself in the cs domain receive AS transmission four request-replies when, utilize The voice medium SDP for the current hang-up user for including in 4th request-reply connects the connection with Conference server in the domain CS；When When first interface unit receives the 4th conversation end request of AS transmission, the connection in ps domain and Conference server is disconnected；Its Middle AS sends the 4th conversation end request after sending the 4th request-reply.

22. a kind of for call business to be switched to the application server in the domain CS from ps domain, which is characterized in that including second interface Unit and connection control unit, in which:

Second interface unit, for receiving the connection management request of user terminal transmission；Wherein user terminal is in packet switch PS When domain is less than predetermined threshold with the network signal intensity of call business and ps domain, the connection management request is sent；According to even The instruction for connecing control unit sends conversation end request to user terminal, so that user terminal is disconnected in ps domain and call business The call business of user terminal is switched to circuit-switched CS domain from ps domain to realize by the connection of participant；

Control unit is connected, when for receiving the connection management request of user terminal transmission in second interface unit, in the domain CS The connection of user terminal Yu call business participant is established, instruction second interface unit sends conversation end to user terminal and asks Ask, wherein receive user terminal be sent to calling user the first connection management request when, update the voice of calling user Media SDP；Wherein user terminal is in the case where ps domain is in the two party call notice state of call waiting, if the network of ps domain is believed Number intensity is less than predetermined threshold, then sends the first connection management request to calling user in the domain CS；Indicate second interface list Member moving exchanging center MSC corresponding with user terminal into the domain CS sends the first request-reply, so as to user terminal utilization The voice medium SDP for the current talking user for including in first request-reply connects the connection with calling user in the domain CS；Instruction Second interface unit sends the request of the first conversation end to user terminal, so that user terminal is disconnected in ps domain and calling user Connection.

23. application server according to claim 22, which is characterized in that

Second interface unit is also used to after sending the request of the first conversation end to user terminal, is sent in the domain CS to user terminal First calling, wherein the first calling includes calling number and the route code of the domain CS, calling number is the number for waiting user, the domain CS road Being used for by code can be by the first call routing to the MSC；So that the MSC is according to the first calling, the is sent to user terminal One notification message enters call waiting in the domain CS so that user terminal knows Call Waiting associated with user is waited Two party call notify state；When receiving the first call answering that the MSC is sent, the first release is sent to user terminal Message, to discharge user terminal and the ps domain between user to be waited to call, wherein the MSC disappears in transmission first notice First call answering is sent after breath.

24. application server according to claim 22, which is characterized in that

Connection control unit is also used to receive the second connecting tube that user terminal is sent to hang-up user in second interface unit When reason request, the voice medium SDP for hanging up user is updated；Wherein user terminal is exhaled in two sides that ps domain is in call waiting It cries under wait state, if the network signal intensity of ps domain is less than predetermined threshold, sends described second to user is hung up in the domain CS Connection management request；Indicate that second interface unit MSC corresponding with user terminal into the domain CS sends the second request-reply, In include the current voice medium SDP for hanging up user in the second request-reply, used to establish user terminal in the domain CS and hang up The calling at family, and the calling between user terminal and hang-up user is continuously maintained at suspended state；Indicate second interface unit The request of the second conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the connection of user.

25. application server according to claim 24, which is characterized in that

Second interface unit is also used to after sending the request of the second conversation end to user terminal, is sent in the domain CS to user terminal Second calling, wherein the second calling includes calling number and the route code of the domain CS, calling number is the number of calling user, the domain CS road Being used for by code can be by the second call routing to the MSC；So that the MSC is according to the second calling, the is sent to user terminal Two notification messages enter call waiting in the domain CS so that user terminal knows Call Waiting associated with communication user Two party call notify state；

Connection control unit is also used to update logical when second interface unit receives the second call answering that the MSC is sent Talk about the voice medium SDP of user；Wherein the MSC connects in the second notice response for receiving user terminal transmission in the domain CS The connection of logical user terminal and calling user by user terminal and hangs up the calling hang-up between user, so that user terminal exists The domain CS enters the two party call wait state of call waiting, and sends second call answering；Indicate second interface list Member sends the second release message to user terminal, to discharge the calling of the ps domain between user terminal and calling user.

26. application server according to claim 22, which is characterized in that

Connection control unit is also used to receive the third connecting tube that user terminal is sent to hang-up user in second interface unit When reason request, the voice medium SDP for hanging up user is updated；Wherein user terminal is in the holding two of third-party call business in ps domain Under party call state, if the network signal intensity of ps domain is less than predetermined threshold, the third is sent to user is hung up in the domain CS Connection management request；Indicate that second interface unit MSC corresponding with user terminal into the domain CS sends third request-reply, Include the current voice medium SDP for hanging up user in middle third request-reply, is used to establish user terminal in the domain CS and hang up The calling at family, and the calling between user terminal and hang-up user is continuously maintained at suspended state；Indicate second interface unit The request of third conversation end is sent to user terminal, so that user terminal disconnects in ps domain and hang up the connection of user.

27. application server according to claim 26, which is characterized in that

Connection control unit is also used to when second interface unit receives the MSC and is sent to the third calling of calling user, Update calling user voice medium SDP, wherein the MSC receive user terminal transmission third notice message when, The connection with calling user is connected in the domain CS, and sends the third calling；Indicate that second interface unit sends the to the MSC Three call answerings, so that the SDP of current talking user is supplied to the MSC；Indicate that second interface unit is sent out to user terminal Third release message is sent, to discharge the connection of the ps domain between user terminal and calling user.

28. application server according to claim 22, which is characterized in that

Connection control unit be also used to receive user terminal be sent to specified session participant the 4th connection management request When, update the voice medium SDP of Conference server；Wherein user terminal is in the third-party call shape of third-party call business in ps domain Under state, if the network signal intensity of ps domain is less than predetermined threshold, the described 4th is sent to specified session participant in the domain CS and is connected Adapter tube reason request；Indicate that second interface unit MSC corresponding with user terminal into the domain CS sends the 4th request-reply, wherein 4th request-reply includes the voice medium SDP of active conference server, so that user terminal is in the connection of the domain CS and conference service The connection of device；Indicate that second interface unit sends the request of the 4th conversation end to user terminal, so that user terminal is disconnected in PS The connection in domain and Conference server.

29. a kind of system for call business to be switched to the domain CS from ps domain, which is characterized in that including user terminal and application Server, in which:

User terminal, the user terminal being related to for any one of claim 15-21；

Application server, the application server being related to for any one of claim 22-28.