CN105282805A

CN105282805A - Method and system for switching call service from PS domain to CS domain and devices for switching call service from PS domain to CS domain

Info

Publication number: CN105282805A
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: 2016-01-27
Anticipated expiration: 2034-07-25
Also published as: CN105282805B

Abstract

The invention discloses a method and system for switching a call service from a PS domain to a CS domain and devices for switching the call service from the PS domain to the CS domain. In a state that a user terminal has the call service in the PS domain, whether the network signal intensity of the PS domain is less than a predetermined threshold or not is detected; if the network signal intensity of the PS domain is less than the predetermined threshold, a connection management request is sent to an application server (AS) in the CS domain so that connection with a call server participation party is established in the CS domain; and, when a session end request sent by the AS is received, connection with the call service participation party in the PS domain is disconnected, so the call service is switched from the PS domain to the CS domain. Functions and an interface protocol of an existing network MSC do not need to be upgraded, and an LTE voice service can be rapidly and flexibly provided on the condition that the full coverage of an LTE is not reached.

Description

For call business to be switched to the methods, devices and systems in CS territory from PS territory

Technical field

The present invention relates to the communications field, particularly one is used for methods, devices and systems call business being switched to CS (CircuitSwitch, circuit switching) territory from PS (PacketSwitch, packet switching) territory.

Background technology

At VoLTE (VoiceoverLTE, voice based on LTE) in voice technology, 3GPP (3rdGenerationPartnershipProject, third generation partner program) specify for support LTE (LongTermEvolution, Long Term Evolution) double-mode and double-standby terminal of+2G/3G can adopt DRVCC (DualRadioVoiceCallContinuity, dual mode voice call continuity) technology carries out realizing the switching between the VoLTE voice in PS territory and the circuit domain voice in CS territory, ensure the continuity of speech business between LTE network (i.e. PS territory) and traditional 2G3G network (i.e. CS territory), this terminal is also referred to as DRVCC terminal.

For CDMA (CodeDivisionMultipleAccess, code division multiple access) operator, namely DRVCC terminal refers to the terminal supporting LTE+CDMA dual-mode dual-standby.When there is PS to CS switching in the DRVCC terminal of current 3GPP specification in business (such as Call Waiting, the Three-Way Calling) process of Three-Way Calling class, need the MSC (MobileSwitchingCenter in CS territory, mobile switching centre) support mid-call function or ICS (IMSCentralizedService, IMS centralized traffic) function, therefore the MSC of operator's existing network needs to carry out function and interface protocol upgrading.

Summary of the invention

The embodiment of the present invention provides a kind of methods, devices and systems for call business to be switched to CS territory from PS territory.By calling class service is switched to CS territory from PS territory, thus without the need to upgrading to the function of existing network MSC and interface protocol, also can provide LTE speech business sooner, more neatly when LTE does not reach all standing.

According to an aspect of the present invention, a kind of method for call business to be switched to CS territory from PS territory is provided, comprises:

Under the state that PS territory has call business, whether the network signal intensity detecting PS territory is less than predetermined threshold;

If the network signal intensity in PS territory is less than predetermined threshold, then send connection management request in CS territory to application server AS, to set up the connection with call business participant in CS territory;

When receiving the conversation end request that AS sends, disconnect the connection in PS territory and call business participant, thus realize call business to be switched to CS territory from PS territory.

In one embodiment, described state is the two party call notify status being in call waiting in PS territory;

Send connection management request in CS territory to AS, comprise with the step of the connection of call business participant to set up in CS territory:

Send the first connection management request in CS territory to calling user, wherein the first connection management request comprises the route code of AS, makes the first connection management request to be routed to AS; So that AS is when receiving the first connection management request, upgrade the voice medium SDP of calling user;

When moving exchanging center MSC corresponding with self in the cs domain receives the first request-reply of AS transmission, the voice medium SDP of the current talking user utilizing the first request-reply to comprise, connects the connection with calling user in CS territory; Wherein AS sends described first request-reply after the voice medium SDP upgrading calling user;

When receiving the conversation end request that AS sends, disconnecting and comprising in the step of the connection of PS territory and call business participant:

When receiving the first conversation end request that AS sends, disconnect the connection in PS territory and calling user; Wherein AS sends described first conversation end request after described first request-reply of transmission.

In one embodiment, disconnect after the step of the connection of PS territory and calling user, also comprise:

When receiving the first notification message that described MSC sends, knowing and waiting for the Call Waiting that user is associated, thus entering the two party call notify status of call waiting in CS territory; Wherein said MSC sends described first notification message after the first calling receiving AS transmission, and the first calling comprises calling number, and calling number is the number of wait user;

When receiving the first release message that AS sends, the PS territory between release and wait user is called out, and wherein AS sends described first release message when receiving the first call answering that described MSC sends.

In one embodiment, described state is the two party call wait state being in call waiting in PS territory;

Send the second connection management request in CS territory to hang-up user, wherein the second connection management request comprises the route code of AS, makes the second connection management request to be routed to AS; So that AS is when receiving the second connection management request, upgrade the voice medium SDP hanging up user;

When MSC corresponding with self in the cs domain receives the second request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the second request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described second request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state;

When receiving the second conversation end request that AS sends, disconnect in PS territory and the connection hanging up user; Wherein AS sends described second conversation end request after described second request-reply of transmission.

In one embodiment, disconnect PS territory with hang up user connection step after, also comprise:

When receiving the second notification message that described MSC sends, know the Call Waiting be associated with calling user, to enter the two party call notify status of call waiting in CS territory; Wherein said MSC sends described second notification message when receiving the second calling that SCCAC sends, and the second calling comprises calling number, and calling number is the number of calling user;

Send the second notice response to described MSC, to connect the connection with calling user in CS territory, the calling hung up between user is hung up, makes the two party call wait state entering call waiting in CS territory;

When receiving the second release message that AS sends, the PS territory between release and calling user is called out; Wherein AS is when receiving the second call answering that described MSC sends, and upgrades the voice medium SDP of calling user, and sends described second release message.

In one embodiment, described state is the maintenance two party call state being in third-party call business in PS territory;

Send the 3rd connection management request in CS territory to hang-up user, wherein the 3rd connection management request comprises the route code of AS, makes the 3rd connection management request to be routed to AS; So that AS is when receiving the 3rd connection management request, upgrade the voice medium SDP hanging up user;

When MSC corresponding with self in the cs domain receives the 3rd request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 3rd request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described 3rd request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state;

When receiving the 3rd conversation end request that AS sends, disconnect in PS territory and the connection hanging up user; Wherein AS sends described 3rd conversation end request after described 3rd request-reply of transmission.

Send third notice message in CS territory to described MSC, to connect the connection with calling user in the cs domain, and make described MSC send the 3rd calling to calling user, wherein the 3rd calling comprises the route code of AS, makes the 3rd calling to be routed to AS;

When receiving the 3rd release message that AS sends, release is connected with the PS territory between calling user; Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message.

In one embodiment, described state is the third-party call state being in third-party call business in PS territory;

Send the 4th connection management request in CS territory to specified session participant, wherein the 4th connection management request comprises the route code of AS, makes the 4th connection management request to be routed to AS; So that AS is when receiving the 4th connection management request, upgrade the voice medium SDP of Conference server;

When MSC corresponding with self in the cs domain receives the 4th request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 4th request-reply to comprise, connects the connection with Conference server in CS territory;

When receiving the 4th conversation end request that AS sends, disconnect the connection in PS territory and Conference server; Wherein AS sends described 4th conversation end request after described 4th request-reply of transmission.

According to a further aspect in the invention, a kind of method for call business to be switched to CS territory from PS territory is provided, comprises:

When receiving the connection management request that user terminal sends, set up the connection of user terminal and call business participant in CS territory; Wherein user terminal is when PS territory has call business and the network signal intensity in PS territory is less than predetermined threshold, sends described connection management request;

Send conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and call business participant, thus realize the call business of user terminal to be switched to CS territory from PS territory.

In one embodiment, when receiving the connection management request that user terminal sends, the step setting up the connection of user terminal and call business participant in CS territory comprises:

When receiving user terminal and sending to the first connection management request of calling user, upgrade the voice medium SDP of calling user; Under the two party call notify status that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described first connection management request in CS territory to calling user;

In CS territory, the moving exchanging center MSC corresponding with user terminal sends the first request-reply, so that the voice medium SDP of the user terminal current talking user that utilizes the first request-reply to comprise, connects the connection with calling user in CS territory;

Send conversation end request to user terminal, comprise in the step of the connection of PS territory and call business participant so that user terminal disconnects:

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

In one embodiment, after the step sending the first conversation end request to user terminal, also comprise:

Send the first calling in CS territory to user terminal, wherein the first calling comprises calling number and the route code of CS territory, and calling number is wait for the number of user, and the route code of CS territory is used for can by the first call routing to described MSC; So that described MSC, according to the first calling, sends the first notification message to user terminal, user terminal known and waits for the Call Waiting that user is associated, entering the two party call notify status of call waiting in CS territory;

When receiving the first call answering that described MSC sends, the first release message is sent to user terminal, so that the PS territory between releasing user terminal and wait user is called out, wherein said MSC sends described first call answering after described first notification message of transmission.

When receiving user terminal and sending to the second connection management request hanging up user, upgrade the voice medium SDP hanging up user; Under the two party call wait state that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described second connection management request in CS territory to hang-up user;

In CS territory, the MSC corresponding with user terminal sends the second request-reply, wherein the second request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state;

The second conversation end request is sent, so that user terminal disconnects in PS territory and the connection hanging up user to user terminal.

In one embodiment, after the step sending the second conversation end request to user terminal, also comprise:

Send the second calling in CS territory to user terminal, wherein the second calling comprises calling number and the route code of CS territory, and calling number is the number of calling user, and the route code of CS territory is used for can by the second call routing to described MSC; So that described MSC, according to the second calling, sends the second notification message to user terminal, makes user terminal know the Call Waiting be associated with communication user, enter the two party call notify status of call waiting in CS territory;

When receiving the second call answering that described MSC sends, upgrade the voice medium SDP of calling user; Wherein said MSC is when receiving the second notice response that user terminal sends, in the connection of CS territory connecting subscribers participating terminal and calling user, user terminal and the calling hung up between user are hung up, make user terminal enter the two party call wait state of call waiting in CS territory, and send described second call answering;

The second release message is sent, so that the PS territory between releasing user terminal and calling user is called out to user terminal.

When receiving user terminal and sending to the 3rd connection management request hanging up user, upgrade the voice medium SDP hanging up user; Under the maintenance two party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 3rd connection management request in CS territory to hang-up user;

MSC corresponding with user terminal in CS territory sends the 3rd request-reply, wherein the 3rd request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state;

The 3rd conversation end request is sent, so that user terminal disconnects in PS territory and the connection hanging up user to user terminal.

In one embodiment, after sending the step of the 3rd conversation end request to user terminal, also comprise:

When receiving MSC and sending to the 3rd calling of calling user, upgrade the voice medium SDP of calling user, wherein MSC is when receiving the third notice message that user terminal sends, and connects the connection with calling user in the cs domain, and sends described 3rd calling;

The 3rd call answering is sent, the SDP of current talking user is supplied to described MSC to described MSC;

The 3rd release message is sent, so that the PS territory between releasing user terminal and calling user connects to user terminal.

When receiving user terminal and sending to the 4th connection management request of specified session participant, upgrade the voice medium SDP of Conference server; Under the third-party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 4th connection management request in CS territory to specified session participant;

MSC corresponding with user terminal in CS territory sends the 4th request-reply, and wherein the 4th request-reply comprises the voice medium SDP of active conference server, so that user terminal connects the connection with Conference server in CS territory;

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

According to a further aspect in the invention, a kind of user terminal for call business to be switched to CS territory from PS territory is provided, comprises detecting unit, first interface unit and switch unit, wherein:

Detecting unit, in PS territory, there is call business state under, detect the network signal intensity in PS territory and whether be less than predetermined threshold;

First interface unit, for the testing result according to detecting unit, if the network signal intensity in PS territory is less than predetermined threshold, then sends connection management request in CS territory to application server AS, to set up the connection with call business participant in CS territory;

Switch unit, for receive when first interface unit AS send conversation end request time, disconnect the connection in PS territory and call business participant, thus realization call business is switched to CS territory from PS territory.

First interface unit specifically sends the first connection management request in CS territory to calling user, and wherein the first connection management request comprises the route code of AS, makes the first connection management request to be routed to AS; So that AS is when receiving the first connection management request, upgrade the voice medium SDP of calling user;

When the concrete moving exchanging center MSC corresponding with user terminal in the cs domain of switch unit receives the first request-reply of AS transmission, the voice medium SDP of the current talking user utilizing the first request-reply to comprise, connects the connection with calling user in CS territory; Wherein AS sends described first request-reply after the voice medium SDP upgrading calling user; When first interface unit receives the first conversation end request of AS transmission, disconnect the connection in PS territory and calling user; Wherein AS sends described first conversation end request after described first request-reply of transmission.

In one embodiment, switch unit is also for receiving the first notification message that described MSC sends during when first interface unit, knows and waiting for the Call Waiting that is associated of user, thus entering the two party call notify status of call waiting in CS territory; Wherein said MSC sends described first notification message after the first calling receiving AS transmission, and the first calling comprises calling number, and calling number is the number of wait user; When first interface unit receives the first release message of AS transmission, release is called out with the PS territory of waiting between user, and wherein AS sends described first release message when receiving the first call answering that described MSC sends.

First interface unit specifically sends the second connection management request in CS territory to hang-up user, and wherein the second connection management request comprises the route code of AS, makes the second connection management request to be routed to AS; So that AS is when receiving the second connection management request, upgrade the voice medium SDP hanging up user;

When the concrete MSC corresponding with self in the cs domain of switch unit receives the second request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the second request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described second request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state; When first interface unit receives the second conversation end request of AS transmission, disconnect in PS territory and the connection hanging up user; Wherein AS sends described second conversation end request after described second request-reply of transmission.

In one embodiment, switch unit also for receive when first interface unit described MSC send the second notification message time, know the Call Waiting be associated with calling user, to enter the two party call notify status of call waiting in CS territory; Wherein said MSC sends described second notification message when receiving the second calling that SCCAC sends, and the second calling comprises calling number, and calling number is the number of calling user; Instruction first interface unit sends the second notice response to described MSC; When first interface unit receives the second release message of AS transmission, release is called out with the PS territory between calling user; Wherein AS is when receiving the second call answering that described MSC sends, and upgrades the voice medium SDP of calling user, and sends described second release message;

First interface unit is also for the instruction according to switch unit, the second notice response is sent to described MSC, to connect the connection with calling user in CS territory, the calling hung up between user is hung up, makes the two party call wait state entering call waiting in CS territory.

First interface unit specifically sends the 3rd connection management request in CS territory to hang-up user, and wherein the 3rd connection management request comprises the route code of AS, makes the 3rd connection management request to be routed to AS; So that AS is when receiving the 3rd connection management request, upgrade the voice medium SDP hanging up user;

When the concrete MSC corresponding with self in the cs domain of switch unit receives the 3rd request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 3rd request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described 3rd request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state; When first interface unit receives the 3rd conversation end request of AS transmission, disconnect in PS territory and the connection hanging up user; Wherein AS sends described 3rd conversation end request after described 3rd request-reply of transmission.

In one embodiment, switch unit is also for disconnecting behind PS territory with the connection of hang-up user, third notice message is sent to described MSC in CS territory, to connect the connection with calling user in the cs domain, and make described MSC send the 3rd calling to calling user, wherein the 3rd calling comprises the route code of AS, makes the 3rd calling to be routed to AS; When first interface unit receives the 3rd release message of AS transmission, release is connected with the PS territory between calling user; Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message;

First interface unit is also for the instruction according to switch unit, and send third notice message in CS territory to calling user, wherein third notice message comprises the route code of AS, makes third notice message to be routed to AS; So that AS is when receiving third notice message, upgrade the voice medium SDP of calling user.

First interface unit specifically sends the 4th connection management request in CS territory to specified session participant, and wherein the 4th connection management request comprises the route code of AS, makes the 4th connection management request to be routed to AS; So that AS is when receiving the 4th connection management request, upgrade the voice medium SDP of Conference server;

When the concrete MSC corresponding with self in the cs domain of switch unit receives the 4th request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 4th request-reply to comprise, connects the connection with Conference server in CS territory; When first interface unit receives the 4th conversation end request of AS transmission, disconnect the connection in PS territory and Conference server; Wherein AS sends described 4th conversation end request after described 4th request-reply of transmission.

According to a further aspect in the invention, a kind of application server for call business to be switched to CS territory from PS territory is provided, comprises the second interface unit and connection control unit, wherein:

Second interface unit, for receiving the connection management request that user terminal sends; Wherein user terminal is when PS territory has call business and the network signal intensity in PS territory is less than predetermined threshold, sends described connection management request; According to the instruction of connection control unit, send conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and call business participant, thus realize the call business of user terminal to be switched to CS territory from PS territory;

Connection control unit, during for receiving connection management request that user terminal sends at the second interface unit, sets up the connection of user terminal and call business participant, indicates the second interface unit to user terminal transmission conversation end request in CS territory.

In one embodiment, connection control unit, specifically when receiving user terminal and sending to the first connection management request of calling user, upgrades the voice medium SDP of calling user; Under the two party call notify status that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described first connection management request in CS territory to calling user; The second interface unit is indicated to send the first request-reply to the moving exchanging center MSC corresponding with user terminal in CS territory, so that the voice medium SDP of the current talking user that user terminal utilizes the first request-reply to comprise, connect the connection with calling user in CS territory; The second interface unit is indicated to send the first conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and calling user.

In one embodiment, second interface unit is also for after sending the first conversation end request to user terminal, the first calling is sent to user terminal in CS territory, wherein the first calling comprises calling number and the route code of CS territory, calling number is wait for the number of user, and the route code of CS territory is used for can by the first call routing to described MSC; So that described MSC, according to the first calling, sends the first notification message to user terminal, user terminal known and waits for the Call Waiting that user is associated, entering the two party call notify status of call waiting in CS territory; When receiving the first call answering that described MSC sends, the first release message is sent to user terminal, so that the PS territory between releasing user terminal and wait user is called out, wherein said MSC sends described first call answering after described first notification message of transmission.

In one embodiment, connection control unit specifically the second interface unit receive user terminal send to hang up the second connection management request of user time, upgrade the voice medium SDP hanging up user; Under the two party call wait state that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described second connection management request in CS territory to hang-up user; The second interface unit is indicated to send the second request-reply to the MSC corresponding with user terminal in CS territory, wherein the second request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit is indicated to send the second conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

In one embodiment, second interface unit is also for after sending the second conversation end request to user terminal, the second calling is sent to user terminal in CS territory, wherein the second calling comprises calling number and the route code of CS territory, calling number is the number of calling user, and the route code of CS territory is used for can by the second call routing to described MSC; So that described MSC, according to the second calling, sends the second notification message to user terminal, makes user terminal know the Call Waiting be associated with communication user, enter the two party call notify status of call waiting in CS territory;

Connection control unit is also for receiving the second call answering that described MSC sends during when the second interface unit, upgrade the voice medium SDP of calling user; Wherein said MSC is when receiving the second notice response that user terminal sends, in the connection of CS territory connecting subscribers participating terminal and calling user, user terminal and the calling hung up between user are hung up, make user terminal enter the two party call wait state of call waiting in CS territory, and send described second call answering; The second interface unit is indicated to send the second release message to user terminal, so that the PS territory between releasing user terminal and calling user is called out.

In one embodiment, connection control unit also for receive at the second interface unit user terminal send to hang up the 3rd connection management request of user time, upgrade the voice medium SDP hanging up user; Under the maintenance two party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 3rd connection management request in CS territory to hang-up user; The MSC indicating the second interface unit corresponding with user terminal in CS territory sends the 3rd request-reply, wherein the 3rd request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit is indicated to send the 3rd conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

In one embodiment, connection control unit also for receive when the second interface unit MSC send to calling user the 3rd calling time, upgrade the voice medium SDP of calling user, wherein MSC is when receiving the third notice message that user terminal sends, connect the connection with calling user in the cs domain, and send described 3rd calling; The second interface unit is indicated to send the 3rd call answering, the SDP of current talking user is supplied to described MSC to described MSC; The second interface unit is indicated to send the 3rd release message to user terminal, so that the PS territory between releasing user terminal and calling user connects.

In one embodiment, connection control unit, specifically when receiving user terminal and sending to the 4th connection management request of specified session participant, upgrades the voice medium SDP of Conference server; Under the third-party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 4th connection management request in CS territory to specified session participant; The MSC indicating the second interface unit corresponding with user terminal in CS territory sends the 4th request-reply, and wherein the 4th request-reply comprises the voice medium SDP of active conference server, so that user terminal connects the connection with Conference server in CS territory; The second interface unit is indicated to send the 4th conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and Conference server.

According to a further aspect in the invention, a kind of system for call business to be switched to CS territory from PS territory is provided, comprises user terminal and application server, wherein:

User terminal is the user terminal that above-mentioned any embodiment relates to;

Application server is the application server that above-mentioned any embodiment relates to.

The present invention is mutual by user terminal and application server, CS territory is switched to from PS territory when user terminal sends third-party call class business, thus without the need to upgrading to the function of existing network MSC and interface protocol, also LTE speech business can be provided sooner, more neatly when LTE does not reach all standing.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is call business is switched to a method embodiment in CS territory by the present invention schematic diagram from PS territory.

Fig. 2 is call business is switched to another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 3 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 4 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 5 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 6 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 7 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 8 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Fig. 9 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

Figure 10 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.

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

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

Figure 13 is call business is switched to a system embodiment in CS territory by the present invention schematic diagram from PS territory.

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

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Unless specifically stated otherwise, otherwise positioned opposite, the numerical expression of the parts of setting forth in these embodiments and step and numerical value do not limit the scope of the invention.

Meanwhile, it should be understood that for convenience of description, the size of the various piece shown in accompanying drawing is not draw according to the proportionate relationship of reality.

May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in the appropriate case, described technology, method and apparatus should be regarded as a part of authorizing specification.

In all examples with discussing shown here, any occurrence should be construed as merely exemplary, instead of as restriction.Therefore, other example of exemplary embodiment can have different values.

It should be noted that: represent similar terms in similar label and letter accompanying drawing below, therefore, once be defined in an a certain Xiang Yi accompanying drawing, then do not need to be further discussed it in accompanying drawing subsequently.

Fig. 1 is call business is switched to a method embodiment in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by user terminal.Such as, user terminal can be DRVCC terminal.

Step 101, under the state that PS territory has call business, whether the network signal intensity detecting PS territory is less than predetermined threshold.

Preferably, above-mentioned state can be the third-party call state of the two party call notify status of call waiting, the two party call wait state of call waiting, the maintenance two party call state of third-party call business and third-party call business.

Step 102, if the network signal intensity in PS territory is less than predetermined threshold, then sends connection management request in CS territory to application server AS, to set up the connection with call business participant in CS territory.

Step 103, when receiving the conversation end request that AS sends, disconnects the connection in PS territory and call business participant, thus realizes call business to be switched to CS territory from PS territory.

Fig. 2 is call business is switched to another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by AS.Preferably, AS can be SCCAS (ServiceCentralizationandContinuityApplication, service centralization and application server for continuity).

Step 201, when receiving the connection management request that user terminal sends, sets up the connection of user terminal and call business participant in CS territory.

Wherein user terminal is when PS territory has call business and the network signal intensity in PS territory is less than predetermined threshold, sends described connection management request.

Step 202, sends conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and call business participant, thus realizes the call business of user terminal to be switched to CS territory from PS territory.

Based on method call business being switched to CS territory from PS territory that the above embodiment of the present invention provides, thus without the need to upgrading to the function of existing network MSC and interface protocol, also LTE speech business can be provided sooner, more neatly when LTE does not reach all standing.

The concrete state of difference below for calling class service is described.

Fig. 3 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by user terminal.In this embodiment, for state be user terminal to be in call waiting two party call notify status in PS territory.Such as, user terminal A in this condition, is in talking state with user B, receives the Call Waiting notice of user C in addition.

Step 301, sends the first connection management request in CS territory to calling user, and wherein the first connection management request comprises the route code of AS, makes the first connection management request to be routed to AS.

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

Step 302, when moving exchanging center MSC corresponding with self in the cs domain receives the first request-reply of AS transmission, the voice medium SDP of the current talking user utilizing the first request-reply to comprise, connects the connection with calling user in CS territory.

Preferably, mobile switching centre also can be MSCe (MobileSwitchingCenteremulation, mobile softswitch center).

Wherein AS sends described first request-reply after the voice medium SDP upgrading calling user.

Step 303, when receiving the first conversation end request that AS sends, disconnects the connection in PS territory and calling user.

Wherein AS sends described first conversation end request after described first request-reply of transmission.

Step 304, when receiving the first notification message that described MSC sends, knowing and waiting for the Call Waiting that user is associated, thus entering the two party call notify status of call waiting in CS territory.

Wherein said MSC sends described first notification message after the first calling receiving AS transmission, and the first calling comprises calling number, and calling number is the number of wait user.

Step 305, when receiving the first release message that AS sends, the PS territory between release and wait user is called out.

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

Thus the call waiting of user terminal is switched to CS territory by PS territory.

Fig. 4 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by AS, to match with the method step in embodiment illustrated in fig. 3, to realize handover operation.In this embodiment, for state be user terminal to be in call waiting two party call notify status in PS territory.

Step 401, when receiving user terminal and sending to the first connection management request of calling user, upgrades the voice medium SDP of calling user.

Under the two party call notify status that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described first connection management request in CS territory to calling user.

Step 402, in CS territory, the moving exchanging center MSC corresponding with user terminal sends the first request-reply, so that the voice medium SDP of the user terminal current talking user that utilizes the first request-reply to comprise, connects the connection with calling user in CS territory.

Step 403, sends the first conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and calling user.

Step 404, sends the first calling in CS territory to user terminal, and wherein the first calling comprises calling number and the route code of CS territory, and calling number is wait for the number of user, and the route code of CS territory is used for can by the first call routing to described MSC.

So that described MSC, according to the first calling, sends the first notification message to user terminal, user terminal known and waits for the Call Waiting that user is associated, entering the two party call notify status of call waiting in CS territory.

Step 405, when receiving the first call answering that described MSC sends, send the first release message to user terminal, so that the PS territory between releasing user terminal and wait user is called out, wherein said MSC sends described first call answering after described first notification message of transmission.

Thus, the call waiting of user terminal can be switched to CS territory by PS territory.

Fig. 5 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by user terminal.In this embodiment, for state be user terminal to be in call waiting two party call wait state in PS territory.Such as, user terminal A and user B are in calling hold mode, and user terminal A and user C are in talking state.

Step 501, send the second connection management request in CS territory to hang-up user, wherein the second connection management request comprises the route code of AS, makes the second connection management request to be routed to AS.

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

Step 502, when MSC corresponding with self in the cs domain receives the second request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the second request-reply to comprise, sets up in CS territory and the calling hanging up user.

Wherein AS sends described second request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state.

Step 503, when receiving the second conversation end request that AS sends, disconnects in PS territory and the connection hanging up user.

Wherein AS sends described second conversation end request after described second request-reply of transmission.

Step 504, when receiving the second notification message that described MSC sends, knows the Call Waiting be associated with calling user, to enter the two party call notify status of call waiting in CS territory.

Wherein said MSC sends described second notification message when receiving the second calling that SCCAC sends, and the second calling comprises calling number, and calling number is the number of calling user.

Step 505, sends the second notice response to described MSC, to connect the connection with calling user in CS territory, the calling hung up between user is hung up, makes the two party call wait state entering call waiting in CS territory.

Step 506, when receiving the second release message that AS sends, the PS territory between release and calling user is called out.

Wherein AS is when receiving the second call answering that described MSC sends, and upgrades the voice medium SDP of calling user, and sends described second release message.

Fig. 6 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by AS, to match with the method step in embodiment illustrated in fig. 5, to realize handover operation.In this embodiment, for state be user terminal to be in call waiting two party call wait state in PS territory.

Step 601, when receiving user terminal and sending to the second connection management request hanging up user, upgrades the voice medium SDP hanging up user.

Under the two party call wait state that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described second connection management request in CS territory to hang-up user.

Step 602, in CS territory, the MSC corresponding with user terminal sends the second request-reply, wherein the second request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state.

Step 603, sends the second conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

Step 604, sends the second calling in CS territory to user terminal, and wherein the second calling comprises calling number and the route code of CS territory, and calling number is the number of calling user, and the route code of CS territory is used for can by the second call routing to described MSC.

So that described MSC, according to the second calling, sends the second notification message to user terminal, makes user terminal know the Call Waiting be associated with communication user, enter the two party call notify status of call waiting in CS territory.

Step 605, when receiving the second call answering that described MSC sends, upgrades the voice medium SDP of calling user.

Wherein said MSC is when receiving the second notice response that user terminal sends, in the connection of CS territory connecting subscribers participating terminal and calling user, user terminal and the calling hung up between user are hung up, make user terminal enter the two party call wait state of call waiting in CS territory, and send described second call answering.

Step 606, sends the second release message to user terminal, so that the PS territory between releasing user terminal and calling user is called out.

Fig. 7 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by user terminal.In this embodiment, for state be user terminal to be in third-party call business maintenance two party call state in PS territory.Such as, user terminal A and user B are in calling suspended state, and user terminal A and user C are in talking state.

Step 701, send the 3rd connection management request in CS territory to hang-up user, wherein the 3rd connection management request comprises the route code of AS, makes the 3rd connection management request to be routed to AS; So that AS is when receiving the 3rd connection management request, upgrade the voice medium SDP hanging up user.

Step 702, when MSC corresponding with self in the cs domain receives the 3rd request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 3rd request-reply to comprise, sets up in CS territory and the calling hanging up user.Wherein AS sends described 3rd request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state.

Step 703, when receiving the 3rd conversation end request that AS sends, disconnects in PS territory and the connection hanging up user.

Wherein AS sends described 3rd conversation end request after described 3rd request-reply of transmission.

Step 704, send third notice message in CS territory to described MSC, to connect the connection with calling user in the cs domain, and make described MSC send the 3rd calling to calling user, wherein the 3rd calling comprises the route code of AS, makes the 3rd calling to be routed to AS.

Step 705, when receiving the 3rd release message that AS sends, release is connected with the PS territory between calling user.

Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message.

Thus, the third-party call business of user terminal can be switched to CS territory by PS territory.

Fig. 8 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by AS, to match with the method step in embodiment illustrated in fig. 7, to realize handover operation.In this embodiment, for state be user terminal to be in third-party call business maintenance two party call state in PS territory.

Step 801, when receiving user terminal and sending to the 3rd connection management request hanging up user, upgrades the voice medium SDP hanging up user.

Under the maintenance two party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 3rd connection management request in CS territory to hang-up user.

Step 802, MSC corresponding with user terminal in CS territory sends the 3rd request-reply, wherein the 3rd request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state.

Step 803, sends the 3rd conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

Step 804, when receiving MSC and sending to the 3rd calling of calling user, upgrades the voice medium SDP of calling user.

Wherein MSC is when receiving the third notice message that user terminal sends, and connects the connection with calling user in the cs domain, and sends described 3rd calling.

Step 805, sends the 3rd call answering, the SDP of current talking user is supplied to described MSC to described MSC.

Step 806, sends the 3rd release message to user terminal, so that the PS territory between releasing user terminal and calling user connects.

Fig. 9 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by user terminal.In this embodiment, for state be user terminal to be in third-party call business third-party call state in PS territory.Such as, user terminal A and user B and user C are in tripartite talks talking state.

Step 901, send the 4th connection management request in CS territory to specified session participant, wherein the 4th connection management request comprises the route code of AS, makes the 4th connection management request to be routed to AS.

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

Step 902, when MSC corresponding with self in the cs domain receives the 4th request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 4th request-reply to comprise, connects the connection with Conference server in CS territory.

Step 903, when receiving the 4th conversation end request that AS sends, disconnects the connection in PS territory and Conference server.

Wherein AS sends described 4th conversation end request after described 4th request-reply of transmission.

Thus user terminal can connect the connection between tripartite talks server in CS territory.

Figure 10 is call business is switched to the another embodiment of method in CS territory by the present invention schematic diagram from PS territory.Preferably, the method step of the present embodiment can be performed by AS, to match with the method step in embodiment illustrated in fig. 9, to realize handover operation.In this embodiment, for state be user terminal to be in third-party call business third-party call state in PS territory.

Step 1001, when receiving user terminal and sending to the 4th connection management request of specified session participant, upgrades the voice medium SDP of Conference server.

Under the third-party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 4th connection management request in CS territory to specified session participant.

Step 1002, MSC corresponding with user terminal in CS territory sends the 4th request-reply, and wherein the 4th request-reply comprises the voice medium SDP of active conference server, so that user terminal connects the connection with Conference server in CS territory.

Step 1003, sends the 4th conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and Conference server.

Figure 11 is the schematic diagram of a user terminal of the present invention embodiment.As shown in figure 11, user terminal comprises detecting unit 1101, first interface unit 1102 and switch unit 1103.Wherein:

Detecting unit 1101, in PS territory, there is call business state under, detect the network signal intensity in PS territory and whether be less than predetermined threshold;

First interface unit 1102, for the testing result according to detecting unit 1101, if the network signal intensity in PS territory is less than predetermined threshold, then sends connection management request in CS territory to application server AS, to set up the connection with call business participant in CS territory.

Switch unit 1103, for receive when first interface unit 1102 AS send conversation end request time, disconnect the connection in PS territory and call business participant, thus realization call business is switched to CS territory from PS territory.

Based on user terminal call business being switched to CS territory from PS territory that the above embodiment of the present invention provides, without the need to upgrading to the function of existing network MSC and interface protocol, also can provide LTE speech business sooner, more neatly when LTE does not reach all standing.

Below the process of user terminal under each state is specifically described.

In one embodiment, above-mentioned state is the two party call notify status being in call waiting in PS territory.

First interface unit 1102 specifically sends the first connection management request in CS territory to calling user, and wherein the first connection management request comprises the route code of AS, makes the first connection management request to be routed to AS; So that AS is when receiving the first connection management request, upgrade the voice medium SDP of calling user.

When the concrete moving exchanging center MSC corresponding with user terminal in the cs domain of switch unit 1103 receives the first request-reply of AS transmission, the voice medium SDP of the current talking user utilizing the first request-reply to comprise, connects the connection with calling user in CS territory; Wherein AS sends described first request-reply after the voice medium SDP upgrading calling user; When first interface unit 1102 receives the first conversation end request of AS transmission, disconnect the connection in PS territory and calling user; Wherein AS sends described first conversation end request after described first request-reply of transmission.

Preferably, switch unit 1103 is also for receiving the first notification message that described MSC sends during when first interface unit 1102, knows and waiting for the Call Waiting that is associated of user, thus entering the two party call notify status of call waiting in CS territory; Wherein said MSC sends described first notification message after the first calling receiving AS transmission, and the first calling comprises calling number, and calling number is the number of wait user; When first interface unit 1102 receives the first release message of AS transmission, release is called out with the PS territory of waiting between user, and wherein AS sends described first release message when receiving the first call answering that described MSC sends.

In one embodiment, above-mentioned state is the two party call wait state being in call waiting in PS territory.

First interface unit 1102 specifically sends the second connection management request in CS territory to hang-up user, and wherein the second connection management request comprises the route code of AS, makes the second connection management request to be routed to AS; So that AS is when receiving the second connection management request, upgrade the voice medium SDP hanging up user.

When the concrete MSC corresponding with self in the cs domain of switch unit 1103 receives the second request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the second request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described second request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state; When first interface unit 1102 receives the second conversation end request of AS transmission, disconnect in PS territory and the connection hanging up user; Wherein AS sends described second conversation end request after described second request-reply of transmission.

Preferably, switch unit 1103 also for receive when first interface unit 1102 described MSC send the second notification message time, know the Call Waiting be associated with calling user, to enter the two party call notify status of call waiting in CS territory; Wherein said MSC sends described second notification message when receiving the second calling that SCCAC sends, and the second calling comprises calling number, and calling number is the number of calling user; Instruction first interface unit 1102 sends the second notice response to described MSC; When first interface unit 1102 receives the second release message of AS transmission, release is called out with the PS territory between calling user; Wherein AS is when receiving the second call answering that described MSC sends, and upgrades the voice medium SDP of calling user, and sends described second release message.

First interface unit 1102 is also for the instruction according to switch unit 1103, the second notice response is sent to described MSC, to connect the connection with calling user in CS territory, the calling hung up between user is hung up, makes the two party call wait state entering call waiting in CS territory.

In one embodiment, above-mentioned state is the maintenance two party call state being in third-party call business in PS territory.

First interface unit 1102 specifically sends the 3rd connection management request in CS territory to hang-up user, and wherein the 3rd connection management request comprises the route code of AS, makes the 3rd connection management request to be routed to AS; So that AS is when receiving the 3rd connection management request, upgrade the voice medium SDP hanging up user.

When the concrete MSC corresponding with self in the cs domain of switch unit 1103 receives the 3rd request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 3rd request-reply to comprise, sets up in CS territory and the calling hanging up user; Wherein AS sends described 3rd request-reply after upgrading the voice medium SDP hanging up user, and the described calling with hanging up user is continued to maintain suspended state; When first interface unit 1102 receives the 3rd conversation end request of AS transmission, disconnect in PS territory and the connection hanging up user; Wherein AS sends described 3rd conversation end request after described 3rd request-reply of transmission.

Preferably, switch unit 1103 is also for disconnecting behind PS territory with the connection of hang-up user, third notice message is sent to described MSC in CS territory, to connect the connection with calling user in the cs domain, and make described MSC send the 3rd calling to calling user, wherein the 3rd calling comprises the route code of AS, makes the 3rd calling to be routed to AS; When first interface unit 1103 receives the 3rd release message of AS transmission, release is connected with the PS territory between calling user; Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message.

First interface unit 1102 is also for the instruction according to switch unit 1103, and send third notice message in CS territory to calling user, wherein third notice message comprises the route code of AS, makes third notice message to be routed to AS; So that AS is when receiving third notice message, upgrade the voice medium SDP of calling user.

In one embodiment, above-mentioned state is the third-party call state being in third-party call business in PS territory.

First interface unit 1102 specifically sends the 4th connection management request in CS territory to specified session participant, and wherein the 4th connection management request comprises the route code of AS, makes the 4th connection management request to be routed to AS; So that AS is when receiving the 4th connection management request, upgrade the voice medium SDP of Conference server.

When the concrete MSC corresponding with self in the cs domain of switch unit 1103 receives the 4th request-reply of AS transmission, the voice medium SDP of the current hang-up user utilizing the 4th request-reply to comprise, connects the connection with Conference server in CS territory; When first interface unit 1102 receives the 4th conversation end request of AS transmission, disconnect the connection in PS territory and Conference server; Wherein AS sends described 4th conversation end request after described 4th request-reply of transmission.

Figure 12 is the schematic diagram of an application server of the present invention embodiment.As shown in figure 12, application server comprises the second interface unit 1201, connection control unit 1202.Wherein:

Second interface unit 1201, for receiving the connection management request that user terminal sends; Wherein user terminal is when PS territory has call business and the network signal intensity in PS territory is less than predetermined threshold, sends described connection management request; According to the instruction of connection control unit 1202, send conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and call business participant, thus realize the call business of user terminal to be switched to CS territory from PS territory.

Connection control unit 1202, for receive at the second interface unit 1201 user terminal send connection management request time, set up the connection of user terminal and call business participant in CS territory, indicate the second interface unit 1201 to send conversation end request to user terminal.

Based on AS call business being switched to CS territory from PS territory that the above embodiment of the present invention provides, without the need to upgrading to the function of existing network MSC and interface protocol, also LTE speech business can be provided sooner, more neatly when LTE does not reach all standing.

Below the process of user terminal under each state is specifically described.

In one embodiment, above-mentioned state is user terminal is in call waiting two party call notify status in PS territory.

Connection control unit 1202 specifically the second interface unit 1201 receive user terminal send to the first connection management request of calling user time, upgrade the voice medium SDP of calling user; Under the two party call notify status that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described first connection management request in CS territory to calling user; The second interface unit 1201 is indicated to send the first request-reply to the moving exchanging center MSC corresponding with user terminal in CS territory, so that the voice medium SDP of the current talking user that user terminal utilizes the first request-reply to comprise, connect the connection with calling user in CS territory; The second interface unit 1201 is indicated to send the first conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and calling user.

Preferably, second interface unit 1201 is also for after sending the first conversation end request to user terminal, the first calling is sent to user terminal in CS territory, wherein the first calling comprises calling number and the route code of CS territory, calling number is wait for the number of user, and the route code of CS territory is used for can by the first call routing to described MSC; So that described MSC, according to the first calling, sends the first notification message to user terminal, user terminal known and waits for the Call Waiting that user is associated, entering the two party call notify status of call waiting in CS territory; When receiving the first call answering that described MSC sends, the first release message is sent to user terminal, so that the PS territory between releasing user terminal and wait user is called out, wherein said MSC sends described first call answering after described first notification message of transmission.

In one embodiment, above-mentioned state is user terminal is in call waiting two party call wait state in PS territory.

Connection control unit 1202 specifically the second interface unit 1201 receive user terminal send to hang up the second connection management request of user time, upgrade the voice medium SDP hanging up user; Under the two party call wait state that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described second connection management request in CS territory to hang-up user; The second interface unit 1201 is indicated to send the second request-reply to the MSC corresponding with user terminal in CS territory, wherein the second request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit 1201 is indicated to send the second conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

Preferably, second interface unit 1201 is also for after sending the second conversation end request to user terminal, the second calling is sent to user terminal in CS territory, wherein the second calling comprises calling number and the route code of CS territory, calling number is the number of calling user, and the route code of CS territory is used for can by the second call routing to described MSC; So that described MSC, according to the second calling, sends the second notification message to user terminal, makes user terminal know the Call Waiting be associated with communication user, enter the two party call notify status of call waiting in CS territory.

Connection control unit 1202 is also for receiving the second call answering that described MSC sends during when the second interface unit 1201, upgrade the voice medium SDP of calling user; Wherein said MSC is when receiving the second notice response that user terminal sends, in the connection of CS territory connecting subscribers participating terminal and calling user, user terminal and the calling hung up between user are hung up, make user terminal enter the two party call wait state of call waiting in CS territory, and send described second call answering; The second interface unit 1201 is indicated to send the second release message to user terminal, so that the PS territory between releasing user terminal and calling user is called out.

In one embodiment, above-mentioned state is user terminal is in third-party call business maintenance two party call state in PS territory.

Connection control unit 1202 also for receive at the second interface unit 1201 user terminal send to hang up the 3rd connection management request of user time, upgrade the voice medium SDP hanging up user; Under the maintenance two party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 3rd connection management request in CS territory to hang-up user; The MSC indicating the second interface unit 1201 corresponding with user terminal in CS territory sends the 3rd request-reply, wherein the 3rd request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit is indicated to send the 3rd conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

Preferably, connection control unit 1202 also for receive when the second interface unit 1201 MSC send to calling user the 3rd calling time, upgrade the voice medium SDP of calling user, wherein MSC is when receiving the third notice message that user terminal sends, connect the connection with calling user in the cs domain, and send described 3rd calling; The second interface unit 1201 is indicated to send the 3rd call answering, the SDP of current talking user is supplied to described MSC to described MSC; The second interface unit 1201 is indicated to send the 3rd release message to user terminal, so that the PS territory between releasing user terminal and calling user connects.

In one embodiment, above-mentioned state is user terminal is in third-party call business third-party call state in PS territory.

Connection control unit 1202, specifically when receiving user terminal and sending to the 4th connection management request of specified session participant, upgrades the voice medium SDP of Conference server; Under the third-party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 4th connection management request in CS territory to specified session participant; The MSC indicating the second interface unit 1201 corresponding with user terminal in CS territory sends the 4th request-reply, and wherein the 4th request-reply comprises the voice medium SDP of active conference server, so that user terminal connects the connection with Conference server in CS territory; The second interface unit 1201 is indicated to send the 4th conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and Conference server.

Figure 13 is call business is switched to a system embodiment in CS territory by the present invention schematic diagram from PS territory.As shown in figure 13, this system comprises user terminal 1301 and application server 1302.Such as, user terminal 1301 can be DVRCC terminal, and application server 1302 can be SCCAS.In one embodiment, the user terminal that user terminal 1301 can relate to for any embodiment in Figure 11, the application server that application server 1302 can relate to for any embodiment in Figure 12.

Below by concrete example, the present invention will be described.In the following embodiments, exemplarily, user terminal UE is DRVCC terminal, and mobile switching centre is MSCe, and application server is SCCAS.

Figure 14 is the schematic diagram that calling class service of the present invention switches an embodiment.In this embodiment, UEA is in the two party call notify status of call waiting in PS territory, wherein UEA and the user B session Y that has one to activate, and what receive user C incoming call session X waits wait order, and two sessions are all anchored on SCCAS.SCCAS stores the SDP that user C sends to UEA to call out in PS territory.

1, UEA determines to trigger according to the change of LTE wireless network signal power and switches.

2, UEA initiates connection management (CM) request in CS territory, the called number route code that to be IMRN+B, IMRN be to SCCAS.MSCe carries out channel assignment for this call request.

3, MSCe makes a call, and called number is the IMRN+B that UEA transmits, and cdma network routes the call to the MGCF of IMS network according to IMRN number.

4, MGCF receives the calling that cdma network is sent here, 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 SCCAS.

6, S-CSCF routes the call to SCCAS corresponding to IMRN.

7, according to the caller (UEA) of the call information received and called party information (IMRN+B), SCCAS judges that UEA will carry out the switching of PS to CS, and the state (the two party call notify status of call waiting) residing for current UE A, SCCAS determines the voice medium SDP being updated to far-end (i.e. user B).

8, SCCAS is initiated to the session updates request of B, sends reINVITE message to S-CSCF, the SDP of the caller SDP of session to be MSCe be this call distribution.

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

10-13, user B automatic-answering back device, and complete the negotiation of SDP, upgrade voice medium address.

14-16, SCCAS, to MSCe automatic-answering back device, return the voice medium SDP of user B.Now UEA connects the connection between B in CS territory, and the connection completed between user B is switched to CS territory from PS territory.

17, SCCAS is to UEA initiation session ending request, disconnects the connection of A at PS territory and user B.

Calling Y now between UEA and user B forwards CS territory to, and the PS territory between UEA and user C is called out X and existed, and user C keeps ringing condition.

18, SCCAS determines the connection between A and C to switch CS territory from PS territory according to the state (connection between A and B has completed the switching from PS to CS, and the connection between A and C is still in PS territory) of current UE A.SCCAS makes a call to from CS territory to A, and the calling number of calling is C, and called number is CSRN+A, CSRN is the route code routing the call to CS territory, and the user C that the SDP of calling stores before being SCCAS issues the SDP of the calling of UEA in PS territory.

19-20, IMS network and cdma network route the call to cdma network according to CSRN and final call routing to the MSCe at UEA place.

21, owing to establishing calling between UEA and user B, the message that MSCe points out to UEA transmit band information, this message informing UEA is current a Call Waiting (calling number is C), and such UEA just enters the two party call notify status of call waiting in CS territory.The MSCe that now call waiting of user transfers to CS territory by the IMS in PS territory controls.

22-24, MSCe answering call, returns ALERTING message to SCCAS.

25, the PS territory that SCCAS sends between Cancel message release UEA and user C to UEA is called out.

Calling X now between UEA and user C also forwards CS territory to, and UEA and user B continues to converse in CS territory, and user C keeps ringing condition.

Figure 15 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UEA is in the two party call wait state of call waiting, and has a session Y hung up between user B, and has a session X activated between user C, and two sessions are all anchored on SCCAS.SCCAS stores user C issues the calling of UEA SDP in PS territory.

1, UEA determines to trigger switching flow according to the change of LTE wireless network signal power.

2, UEA initiates CM request in CS territory, the called number route code that to be IMRN+B, IMRN be to SCCAS.MSCe carries out channel assignment for this call request.

6, S-CSCF routes the call to SCCAS corresponding to IMRN.

7, according to the caller (UEA) of the call information received and called party information (IMRN+B), SCCAS judges that UEA will carry out the switching of PS territory to CS territory, and the state (the two party call wait state of call waiting) residing for current UE A, SCCAS determines the voice medium SDP being updated to far-end (i.e. user B).

8, SCCAS is initiated to the session updates request of user B, sends reINVITE message to S-CSCF, the SDP of the caller SDP of session to be MSCe be this call distribution.

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

10-13, user B automatic-answering back device, and complete the negotiation of SDP, upgrade voice medium SDP.

14-16, SCCAS, to MSCe automatic-answering back device, return the voice medium SDP of user B.Now UEA the calling of disconnecting between CS territory and user B, but continue to connect the calling between PS territory and user C.

Calling Y now between UEA and user B forwards CS territory to, and the PS territory between UEA and user C is called out and existed, and UEA continues to turn on the connection between PS territory and user C, and now SCCAS continues to maintain the calling suspended state between UEA and user B.

18, SCCAS determines the connection between UEA and user C to switch CS territory from PS territory according to the state (connection between UEA and user B is transformed into CS territory from PS territory, and the connection between UEA and user C is still in PS territory) of current UE A.SCCAS makes a call to from CS territory to UEA, and the calling number of calling is C, and called number is CSRN+A, CSRN is the route code routing the call to CS territory, and the user C that the SDP of calling stores before being SCCAS issues the SDP of the calling of UEA in PS territory.

22-24, MSCe answering call, returns ALERTING message to SCCAS.

25, the message of UEA automatic-answering back device information prompting, MSCe connects the calling between UEA and user C, and the calling between UEA and user B is hung up.The now UEA connection turned between CS territory and user C completes the switching from PS territory to CS territory, and UEA just enters the two party call wait state of call waiting in CS territory.

26-28, MSCe return response message to SCCAS, and response message is included as the SDP that MSCe is this call distribution.

29, after SCCAS receives the response that MSCe returns, the session updates request of user C is initiated to.

30-35, SCCAS send reINVITE message to user C, the SDP of the caller SDP of session to be MSCe be this call distribution.User C automatic-answering back device completes the renewal of SDP.

36, the PS territory that SCCAS sends between Cancel message release A and C to UEA is called out.

Calling X now between UEA and user C also forwards CS territory to, and UEA and user C is at CS domain call, and the calling Y of UEA and user B is in suspended state in CS territory.

Figure 16 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UEA is in the maintenance two party call state of third-party call business, and has a session Y hung up between user B, and has a session X activated between user C, and two sessions are all anchored on SCCAS.

6, S-CSCF routes the call to SCCAS corresponding to IMRN.

7, according to the caller (UEA) of the call information received and called party information (IMRN+B), SCCAS judges that UEA will carry out the switching of PS to CS, and the state (the maintenance two party call state of third-party call business) residing for current UE A, SCCAS determines the voice medium SDP being updated to far-end (i.e. user B).

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

14-16, SCCAS, to MSCe automatic-answering back device, return the voice medium SDP of user B.Now UEA the calling of disconnecting between CS territory and B, but continue to connect the calling between PS territory and C.

17, SCCAS is to UEA initiation session ending request, disconnects the connection of A at PS territory and B.

Calling Y now between UEA and B forwards CS territory to, and the PS territory calling between UEA and C exists, and UEA continues to turn on the connection between PS territory and user C, and now SCCAS continues to maintain the calling suspended state between UEA and B.

18, UEA initiates the message of information prompting in CS territory, starts third-party call to C (called number is IMRN+C).The connection that UEA turns between CS territory and user C completes switching, and now the third-party call Service control of UEA is handed to the MSC in CS territory by the IMS in PS territory.

19, MSCe makes a call, and called number is the IMRN+C that UEA transmits, and cdma network routes the call to the MGCF of IMS network according to IMRN number.

20, MGCF receives the calling that cdma network is sent here, 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 SCCAS.

22, S-CSCF routes the call to SCCAS corresponding to IMRN.

23, according to the caller (UEA) of the call information received and called party information (IMRN+C), SCCAS judges that UEA will carry out the calling between C the switching of PS to CS, and (connection between A and B is transformed into CS territory from PS territory to the state residing for current UE A, connection between A and C is still in PS territory), SCCAS determines the voice medium SDP being updated to far-end (i.e. user C).

24, SCCAS is initiated to the session updates request of C, sends reINVITE message to S-CSCF, the SDP of the caller SDP of session to be MSCe be this call distribution.

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

26-29, user C automatic-answering back device, and complete the negotiation of SDP, upgrade voice medium SDP.

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

33, SCCAS is to UEA initiation session ending request, disconnects the connection of A at PS territory and C.

Calling X now between UEA and C also forwards CS territory to, and UEA and C is at CS domain call, and the calling Y of UEA and B is in suspended state in CS territory.

Figure 17 is the schematic diagram that calling class service of the present invention switches another embodiment.In this embodiment, UEA is in the third-party call state of third-party call business, and has a session X between Conference server (CONFAS), has Y and Z between user B and user C and CONFAS.

6, S-CSCF routes the call to SCCAS corresponding to IMRN.

7, according to the caller (UEA) of the call information received and called party information (IMRN+B), SCCAS judges that UEA will carry out the switching of PS to CS, and the state (the third-party call state of third-party call business) residing for current UE A, SCCAS determines the voice medium SDP being updated to far-end (i.e. CONFAS).

8, SCCAS is initiated to the session updates request of CONFAS, sends reINVITE message to CONFAS, the SDP of the caller SDP of session to be MSCe be this call distribution.

9-10, CONFAS automatic-answering back device completes the negotiation of SDP, more the SDP of new session X.

11-13, SCCAS, to MSCe automatic-answering back device, return the voice medium SDP of CONFAS.UEA connects the calling between CS territory and CONFAS, completes the switching from PS territory to CS territory.

14, SCCAS is to UEA initiation session ending request, disconnects the connection of A at PS territory and CONFAS.

Calling X now between UEA and CONFAS forwards CS territory to, and the third-party call business of UEA continues to be provided by the IMS in PS territory.

By implementing the present invention, the existing network MSCe of CDMA operator can upgrade, avoid MSC in international standard and must carry out the problem of function and interface upgrade, thus CDMA operator can carry out LTE speech business quickly, more neatly, and decrease investment and the impact on existing network.

One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.

Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.

Claims

1., for call business to be switched to the method in CS territory from PS territory, it is characterized in that, comprising:

2. method according to claim 1, is characterized in that,

Described state is the two party call notify status being in call waiting in PS territory;

3. method according to claim 2, is characterized in that,

Disconnect after the step of the connection of PS territory and calling user, also comprise:

4. method according to claim 1, is characterized in that,

Described state is the two party call wait state being in call waiting in PS territory;

5. method according to claim 4, is characterized in that,

Disconnect PS territory with hang up user connection step after, also comprise:

6. method according to claim 1, is characterized in that,

Described state is the maintenance two party call state being in third-party call business in PS territory;

7. method according to claim 6, is characterized in that,

Disconnect PS territory with hang up user connection step after, also comprise:

When receiving the 3rd release message that AS sends, release is connected with the PS territory between calling user; Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that described MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message.

8. method according to claim 1, is characterized in that,

Described state is the third-party call state being in third-party call business in PS territory;

9., for call business to be switched to the method in CS territory from PS territory, it is characterized in that, comprising:

10. method according to claim 9, is characterized in that,

When receiving the connection management request that user terminal sends, the step setting up the connection of user terminal and call business participant in CS territory comprises:

11. methods according to claim 10, is characterized in that,

After the step sending the first conversation end request to user terminal, also comprise:

12. methods according to claim 9, is characterized in that,

13. methods according to claim 12, is characterized in that,

After the step sending the second conversation end request to user terminal, also comprise:

14. methods according to claim 9, is characterized in that,

15. methods according to claim 14, is characterized in that,

After sending the step of the 3rd conversation end request to user terminal, also comprise:

When receiving described MSC and sending to the 3rd calling of calling user, upgrade the voice medium SDP of calling user, wherein said MSC, when receiving the third notice message that user terminal sends, connects the connection with calling user in the cs domain, and sends described 3rd calling;

16. methods according to claim 9, is characterized in that,

17. 1 kinds, for call business to be switched to the user terminal in CS territory from PS territory, is characterized in that, comprise detecting unit, first interface unit and switch unit, wherein:

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

19. user terminals according to claim 18, is characterized in that,

Switch unit is also for receiving the first notification message that described MSC sends during when first interface unit, knows and waiting for the Call Waiting that is associated of user, thus entering the two party call notify status of call waiting in CS territory; Wherein said MSC sends described first notification message after the first calling receiving AS transmission, and the first calling comprises calling number, and calling number is the number of wait user; When first interface unit receives the first release message of AS transmission, release is called out with the PS territory of waiting between user, and wherein AS sends described first release message when receiving the first call answering that described MSC sends.

20. user terminals according to claim 17, is characterized in that,

21. user terminals according to claim 20, is characterized in that,

Switch unit also for receive when first interface unit described MSC send the second notification message time, know the Call Waiting be associated with calling user, to enter the two party call notify status of call waiting in CS territory; Wherein said MSC sends described second notification message when receiving the second calling that SCCAC sends, and the second calling comprises calling number, and calling number is the number of calling user; Instruction first interface unit sends the second notice response to described MSC; When first interface unit receives the second release message of AS transmission, release is called out with the PS territory between calling user; Wherein AS is when receiving the second call answering that described MSC sends, and upgrades the voice medium SDP of calling user, and sends described second release message;

22. user terminals according to claim 17, is characterized in that,

23. user terminals according to claim 22, is characterized in that,

Switch unit is also for disconnecting behind PS territory with the connection of hang-up user, third notice message is sent to described MSC in CS territory, to connect the connection with calling user in the cs domain, and make described MSC send the 3rd calling to calling user, wherein the 3rd calling comprises the route code of AS, makes the 3rd calling to be routed to AS; When first interface unit receives the 3rd release message of AS transmission, release is connected with the PS territory between calling user; Wherein AS upgrades the voice medium SDP of calling user when receiving the 3rd calling that described MSC sends, and the voice medium SDP of current talking user is sent to described MSC, and sends described 3rd release message;

24. user terminals according to claim 17, is characterized in that,

25. 1 kinds for call business to be switched to the application server in CS territory from PS territory, is characterized in that, comprise the second interface unit and connection control unit, wherein:

26. application servers according to claim 25, is characterized in that,

Connection control unit, specifically when receiving user terminal and sending to the first connection management request of calling user, upgrades the voice medium SDP of calling user; Under the two party call notify status that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described first connection management request in CS territory to calling user; The second interface unit is indicated to send the first request-reply to the moving exchanging center MSC corresponding with user terminal in CS territory, so that the voice medium SDP of the current talking user that user terminal utilizes the first request-reply to comprise, connect the connection with calling user in CS territory; The second interface unit is indicated to send the first conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and calling user.

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

Second interface unit is also for after sending the first conversation end request to user terminal, the first calling is sent to user terminal in CS territory, wherein the first calling comprises calling number and the route code of CS territory, calling number is wait for the number of user, and the route code of CS territory is used for can by the first call routing to described MSC; So that described MSC, according to the first calling, sends the first notification message to user terminal, user terminal known and waits for the Call Waiting that user is associated, entering the two party call notify status of call waiting in CS territory; When receiving the first call answering that described MSC sends, the first release message is sent to user terminal, so that the PS territory between releasing user terminal and wait user is called out, wherein said MSC sends described first call answering after described first notification message of transmission.

28. application servers according to claim 25, is characterized in that,

Connection control unit specifically the second interface unit receive user terminal send to hang up the second connection management request of user time, upgrade the voice medium SDP hanging up user; Under the two party call wait state that wherein user terminal is in call waiting in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described second connection management request in CS territory to hang-up user; The second interface unit is indicated to send the second request-reply to the MSC corresponding with user terminal in CS territory, wherein the second request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit is indicated to send the second conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

29. application servers according to claim 28, is characterized in that,

Second interface unit is also for after sending the second conversation end request to user terminal, the second calling is sent to user terminal in CS territory, wherein the second calling comprises calling number and the route code of CS territory, calling number is the number of calling user, and the route code of CS territory is used for can by the second call routing to described MSC; So that described MSC, according to the second calling, sends the second notification message to user terminal, makes user terminal know the Call Waiting be associated with communication user, enter the two party call notify status of call waiting in CS territory;

30. application servers according to claim 25, is characterized in that,

Connection control unit also for receive at the second interface unit user terminal send to hang up the 3rd connection management request of user time, upgrade the voice medium SDP hanging up user; Under the maintenance two party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 3rd connection management request in CS territory to hang-up user; The MSC indicating the second interface unit corresponding with user terminal in CS territory sends the 3rd request-reply, wherein the 3rd request-reply comprises the voice medium SDP of current hang-up user, to set up user terminal and the calling hanging up user in CS territory, and user terminal and the calling hung up between user are continued to maintain suspended state; The second interface unit is indicated to send the 3rd conversation end request to user terminal, so that user terminal disconnects in PS territory and the connection hanging up user.

31. application servers according to claim 30, is characterized in that,

Connection control unit also for receive when the second interface unit described MSC send to calling user the 3rd calling time, upgrade the voice medium SDP of calling user, wherein said MSC is when receiving the third notice message that user terminal sends, connect the connection with calling user in the cs domain, and send described 3rd calling; The second interface unit is indicated to send the 3rd call answering, the SDP of current talking user is supplied to described MSC to described MSC; The second interface unit is indicated to send the 3rd release message to user terminal, so that the PS territory between releasing user terminal and calling user connects.

32. application servers according to claim 25, is characterized in that,

Connection control unit, specifically when receiving user terminal and sending to the 4th connection management request of specified session participant, upgrades the voice medium SDP of Conference server; Under the third-party call state that wherein user terminal is in third-party call business in PS territory, if the network signal intensity in PS territory is less than predetermined threshold, then send described 4th connection management request in CS territory to specified session participant; The MSC indicating the second interface unit corresponding with user terminal in CS territory sends the 4th request-reply, and wherein the 4th request-reply comprises the voice medium SDP of active conference server, so that user terminal connects the connection with Conference server in CS territory; The second interface unit is indicated to send the 4th conversation end request to user terminal, so that user terminal disconnects the connection in PS territory and Conference server.

33. 1 kinds for call business to be switched to the system in CS territory from PS territory, is characterized in that, comprise user terminal and application server, wherein:

User terminal, the user terminal related to any one of claim 17-24;

Application server, the application server related to any one of claim 25-32.