CN101577883B

CN101577883B - Method, device and system for talking connection

Info

Publication number: CN101577883B
Application number: CN200810146073.6A
Authority: CN
Inventors: 谢振华
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-08-07
Filing date: 2008-08-07
Publication date: 2014-02-05
Anticipated expiration: 2028-08-07
Also published as: CN101577883A

Abstract

The invention provides a method, a device and a system for talking connection. The method comprises the following steps that: AS receives a first invitation message sent to target UE by ICS UE, and sends a transfer message to CS-IMS switching equipment, wherein the transfer message is used for indicating the CS-IMS switching equipment to send a second invitation message to the target UE; the AS receives the second invitation message sent to the target UE by the CS-IMS switching equipment, and forwards the second invitation message to the target UE; and the AS receives a second response messageto the second invitation message from the target UE, and sends a first response message to the first invitation message to the ICS UE. The technical proposal can improve the efficiency of the talking connection.

Description

Call connection method, Apparatus and system

Technical field

The present invention relates to mobile communication technology field, relate in particular to a kind of call connection method, Apparatus and system.

Background technology

IP (network interconnection agreement, Internet Protocol, referred to as IP) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, referred to as IMS) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network architecture proposing, this system constructing a kind of opening and service environment flexibly, supporting multimedia application can provide abundant multimedia service for user.

IMS can be divided into key-course and operation layer.Wherein, key-course mainly comprises conversation control function (the Call Session Control Function that triggers and control for business, referred to as CSCF), and CSCF can be divided into proxy CSCF (Proxy CSCF, referred to as P-CSCF), inquiry CSCF (Interrogating CSCF, referred to as I-CSCF) and serving CSCF (Serving CSCF, referred to as S-CSCF).And operation layer mainly comprises a series of application server (Application Server, referred to as AS), for concrete service business is provided, AS can be entity independently, also may reside in S-CSCF.

In current mobile communication system, there is subscriber equipment (the User Equipment that does not support IMS media protocol, referred to as UE), such UE can not directly access the media protocol of IMS, if but this UE support circuit-switched (Circuit Switch, referred to as CS) procotol and the signaling protocol of supporting IMS, can provide media channel to be linked into IMS by CS network, this UE by CS network insertion IMS can be referred to as the UE (IMS Centralized Service UE, referred to as ICS UE) of IMS centralized traffic.Wherein, between CS network and IMS network, can pass through the transfer gateway of IMS network or the (MSCe of enhancing mobile switching centre of CS network, Moblie Switch Center enhanced) connect, also can coordinate and be connected with the transfer gateway of IMS network by MSCe, wherein, the transfer gateway of IMS network comprises MGCF entity (the Media Gateway Control Function for signaling conversion, referred to as MGCF) and for the media gateway (MGW, Media GateWay) of media conversion.The transfer gateway of MSCe and IMS network coordinates the MGW that refers to MSCe and IMS network to coordinate, and now the function class of MSCe is similar to MGCF.

ICS UE-A sets up call by transfer gateway and the IMS UE-B of MSCe or IMS network, may also need to call out again another UE-C, it is the existing CS media link of ICS UE-A, need to realize IMS media link is connected with existing CS media link, there are in the prior art two kinds of implementation methods, are described respectively below.

Fig. 1 is that prior art one realizes the flow chart that IMS media link is connected with existing CS media link, as shown in Figure 1, mainly comprise that step is following (because AS and S-CSCF can be referred to as the functional similarity of the transfer gateway of service equipment, MSCe and IMS network, therefore, in the drawings AS and S-CSCF are expressed as to an entity, the transfer gateway of MSCe and IMS network are expressed as to an entity):

Step 101, ICS UE-A set up and are connected with the call of UE-B according to the IMS centralized traffic process of standard, this connection comprises two sections of media links, one section is the CS media link of ICS UE-A and MSCe or MGW, one section is the IMS media link of MSCe or MGW and UE-B, owing to will initiating new calling, ICS UE-A will be placed in hold mode with the call of UE-B, and therefore, IMS media link does not have media data to transmit;

Step 102, ICS UE-A initiate new calling with IMS signaling to UE-C, such as sending INVITE (invitation) message, and message travels S-CSCF, S-CSCF, according to service trigger criteria, forwards this message to AS;

Step 103, AS determine that the calling subscriber of this message related to calls is ISC UE, and this UE has existed call to connect, therefore, the media resource information in message related to calls is revised as to the MSCe of existing call connection or the media resource information 1 of MGW, then forwards this message related to calls;

Step 104, UE-C answering call, such as sending " 200OK " message of IMS, the media resource information of carrying UE-C in this response message, this response message arrives AS through S-CSCF;

Step 105, AS receive response message, after media resource information is wherein revised by standard procedure, are transmitted to ICS UE-A;

Step 106, AS, according to the media resource information of the UE-C receiving, send to MSCe or MGCF the IMS signaling of upgrading IMS media link, such as sending UPDATE (renewal) message, carry the media resource information of UE-C in this message;

The transfer gateway of step 107, MSCe or IMS network is revised as IMS media links with UE-C and is connected, and connect CS media links and new IMS media links, then MSCe or MGCF send the agreement updating message of IMS signaling, such as sending " 200OK " message, in this message, carry the IMS media resource information 2 of MSCe or MGW, this media resource information 2 may be identical with the media resource information 1 in step 103, also may be different.

If the media resource information 2 in step 107 is identical with the media resource information 1 in step 103, between ICS UE-A and UE-C, having set up call is connected, this call connects and comprises two sections of media links, and one section is existing CS media links, and one section is new IMS media links.

If the media resource information 2 in step 107 is different from the media resource information 1 in step 103, cannot set up the IMS media links of MSCe or MGW and UE-C, also just cannot realize between ISC UE-A and UE-C and conversing, therefore this method is a kind of incomplete negotiation of media resource, has certain risk.

Fig. 2 is that prior art two realizes the flow chart that IMS media link is connected with existing CS media link, and as shown in Figure 2, this flow process mainly comprises the steps:

Step 201～205, identical with step 101～105 in Fig. 1;

Step 206, AS send heavily call request to UE-C, such as sending re-INVITE message, do not carry any media resource information in this message;

Step 207, UE-C reply recall, such as sending " 200 OK " message, in this message, carry the media resource information of UE-C;

Step 208, AS receive response message, to MSCe or MGCF, send heavily call request, such as sending re-INVITE message, carry the media resource information of UE-C in this message;

Step 209, MSCe or MGCF reply recall, such as sending " 200OK " message, in this message, carry the media resource information of MSCe or MGW;

Step 210, AS receive response message, to UE-C, send and confirm response message, such as sending ACK (confirmation) message, carry the media resource information of MSCe or MGW in this message;

Step 211, in execution step 210, AS sends and confirms response message to MSCe or MGCF, such as sending ACK message.

So far, set up call and is connected between ICS UE-A and UE-C, call connection comprises two sections of media links, and one section is existing CS media links, and one section is new IMS media links.In said method, after UE-C replys, also need to carry out the heavily negotiation of media resource, then could really realize call, increased the reciprocal process with UE-C, extended the time of realizing call, reduced the efficiency of system, reduced user's experience.

Summary of the invention

In view of this, the invention provides a kind of call connection scheme, in order to solve the incomplete negotiation due to media resource in prior art, cause call connection unsuccessful, or due to the lower problem of efficiency that need to heavily consult to cause.

According to an aspect of the present invention, a kind of call connection method is provided, and the method is applied to comprise the system of user terminal ICS UE, application server AS, circuit domain CS-IP multimedia subsystem, IMS conversion equipment and the object UE of IP Multimedia System centralized traffic.

Call connection method according to the present invention comprises: AS receives the first invitation message that ICS UE sends to object UE, and send Transfer Message to CS-IMS conversion equipment, wherein, Transfer Message is used to indicate CS-IMS conversion equipment and sends the second invitation message to object UE; AS receives the second invitation message that CS-IMS conversion equipment sends to object UE, and the second invitation message is transmitted to object UE; Second response message of AS receiving target UE to the second invitation message, and send the first response message to the first invitation message to ICS UE.

According to a further aspect of the invention, provide a kind of application server.

Application according to the present invention server comprises: the first invitation message that the first receiver module sends to object UE for receiving ICS UE; Sending module, for receiving after the first invitation message at the first receiver module, sends Transfer Message to CS-IMS conversion equipment, and wherein, Transfer Message is used to indicate CS-IMS conversion equipment and sends the second invitation message to diverting the aim of Transfer Message; The second receiver module is for receiving CS-IMS conversion equipment to the second invitation message that diverts the aim and send; The first forwarding module sends to object UE for the second invitation message that the second receiver module is received; The response message of the second invitation message that the 3rd receiver module sends for receiving target UE; The second forwarding module, for receiving after response message at the 3rd receiver module, sends the response message of the first invitation message to ICS UE.

According to a further aspect of the invention, provide a kind of CS-IMS conversion equipment.

CS-IMS conversion equipment according to the present invention comprises: the Transfer Message that receiver module sends for receiving AS; The state Transfer Message of sending module for receiving according to receiver module, to the transmission invitation message that diverts the aim of Transfer Message.

According to a further aspect of the invention, provide a kind of call connected system.

Call connected system according to the present invention comprises: ICS UE is for sending the first invitation message to object UE; AS, for after receiving the first invitation message, sends Transfer Message to CS-IMS conversion equipment, and after the response message receiving from object UE, sends the response message of the first invitation message to ICSUE; CS-IMS conversion equipment, for after the Transfer Message receiving from AS, sends the second invitation message according to diverting the aim of Transfer Message to object UE; Object UE, for after receiving the second invitation message forwarding through AS, is returned to response message to ICS UE.

By above-mentioned at least one technical scheme of the present invention, by AS, notify CS-IMS conversion equipment to initiate invitation message to object UE, to set up CS-IMS conversion equipment, be connected with the media between object UE, thereby, can set up being connected between ICSUE and object UE without heavily consult in the situation that, thereby improve the efficiency that call connects.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in the specification write, claims and accompanying drawing.

Accompanying drawing explanation

Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:

Fig. 1 is the flow chart being connected with existing CS media link according to the IMS media link of prior art one;

Fig. 2 is the flow chart being connected with existing CS media link according to the IMS media link of prior art two;

Fig. 3 is for to realize the Organization Chart of IMS centralized traffic according to the ICS UE of the embodiment of the present invention by the transfer gateway of IMS network;

Fig. 4 is for to realize the Organization Chart of IMS centralized traffic according to the ICS UE of the embodiment of the present invention by the MSCe of CS network;

Fig. 5 A is according to the structured flowchart of the application server of the embodiment of the present invention;

Fig. 5 B is the structured flowchart of application server according to the preferred embodiment of the invention;

Fig. 6 A is according to the structured flowchart of the CS-IMS conversion equipment of the embodiment of the present invention;

Fig. 6 B is the structured flowchart of CS-IMS conversion equipment according to the preferred embodiment of the invention;

Fig. 7 is according to the structured flowchart of the call connected system of the embodiment of the present invention;

Fig. 8 is according to the flow chart of the call connection method of the embodiment of the present invention;

Fig. 9 is the particular flow sheet of the embodiment of the present invention one;

Figure 10 is the particular flow sheet of the embodiment of the present invention two;

Figure 11 is the particular flow sheet of the embodiment of the present invention three.

Embodiment

Functional overview

As mentioned above, in IMS business system, when realizing newly-built IMS media link and be connected with existing CS media link, because media resource information reconciliation is imperfect, and cause may occurring realizing call, connect or heavily consult due to after replying in object UE, and causing realizing the problems such as process that call connects is tediously long.For the problems referred to above, the present invention proposes a kind of scheme of conversing and connecting, in the call connection scheme providing in the embodiment of the present invention, AS is receiving ICS UE after the invitation message of object UE transmission, notice CS-IMS conversion equipment sends invitation message to object UE, rather than as currently used technology, act on behalf of CS-IMS conversion equipment and send invitation message to object UE, thereby being connected between ICS UE and object UE can set up without heavily consult in the situation that.

For the ease of understanding, before the embodiment of the embodiment of the present invention is described, first ICS UE is realized to the flow process that IMS centralized traffic (as shown in Figure 3) and the ICS UE MSCe by CS network realizes IMS centralized traffic (as shown in Figure 4) by the transfer gateway of IMS network and be briefly described.

Fig. 3 is that ICS UE realizes the network architecture diagram of IMS centralized traffic by the transfer gateway of IMS network, Fig. 3 gets the bid and understands the signaling paths of ICS UE-A call IMS UE-B, and UE-B replys the ICS UE-A of rear foundation and the media path of UE-B call, index map 3, ICS UE-A is as follows by the transfer gateway of IMS network and the process of IMS terminal UE-B foundation call:

Step 301, ICS UE-A call out UE-B by IMS signaling protocol, and signaling message arrives S-CSCF;

Step 302, S-CSCF are according to service trigger criteria, signaling message is sent to AS, AS judgement calling subscriber can not set up IMS media channel, to ICS UE-A, sends IMS signaling message, and this signaling message indication ICS UE-A is by special number of CS calling network.

By network configuration, can ICS UE-A signaling by this special number of CS calling network be routed to this AS, and this AS can be according to the calling of this special number associated steps 302, and this message is arrived to ICS UE-A along 302 in Fig. 3,301 path;

Step 303, ICS UE-A make a call to special number by CS signaling protocol, and this signaling message arrives MGCF;

Step 304, MGCF notice MGW set up the CS media link between ICS UE-A and MGW;

Step 305, MGCF are converted to IMS signaling protocol by CS signaling protocol, and in this IMS signaling, carry the media resource information of MGW, send to S-CSCF;

Step 306, S-CSCF, according to service trigger criteria, send to AS by signaling message;

Step 307, AS are associated with the signaling message of step 302 according to the special number in signaling message, thereby obtain the information of called UE-B, so to UE-B transmitting signaling message;

After step 308, UE-B have replied and have called out, set up the media link between UE-B and MGW, MGW realizes the call of ICS UE-A and UE-B by conversion IMS media protocol and CS media protocol, sets up call and be connected between ICS UE-A and UE-B, this connection comprises in two sections of media chains

Fig. 4 is that ICS UE realizes the network architecture diagram of IMS centralized traffic by the MSCe of CS network, Fig. 4 gets the bid and understands the signaling paths of ICS UE-A call IMS UE-B, and UE-B replys the ICS UE-A of rear foundation and the media path of UE-B call, compare with Fig. 3, the transfer gateway that Fig. 4 replaces IMS network with MSCe, is realized the effect of the transfer gateway (comprising MGCF and MGW) of IMS by MSCe.ICS UE-A is similar to Fig. 3 to the process that IMS terminal UE-B sets up call by the MSCe of CS network, at this, is not repeating.

Based on said process, according to the embodiment of the present invention, first provide a kind of application server, for notifying CS-IMS conversion equipment to send invitation message to object UE.

Fig. 5 A is according to the structured flowchart of the application server of the embodiment of the present invention, Fig. 5 B is the structured flowchart of application server according to the preferred embodiment of the invention, as shown in Figure 5A, according to the application server of the embodiment of the present invention, comprise: the first receiver module 51, sending module 52, the second receiver module 53, the first forwarding module 54, the 3rd receiver module 55 and the second forwarding module 56.Further combined with accompanying drawing, above-mentioned modules is described below.

The first receiver module 51, the first invitation message sending to object UE for receiving ICS UE;

Sending module 52 is connected with the first receiver module 51, for receiving after the first invitation message at the first receiver module 51, to CS-IMS conversion equipment, send Transfer Message, wherein, this Transfer Message is used to indicate CS-IMS conversion equipment and sends the second invitation message to diverting the aim of Transfer Message;

The second receiver module 53, for receiving CS-IMS conversion equipment to described the second invitation message that diverts the aim and send;

The first forwarding module 54 is connected with the second receiver module 53, for the second invitation message that the second receiver module 53 is received, sends to object UE;

The 3rd receiver module 55, the response message of the second invitation message sending for receiving target UE;

Second forwards 56 of moulds is connected with the 3rd receiver module 55, for receiving after response message at the 3rd receiver module, sends the response message of the first invitation message to ICS UE.

In specific implementation process, the second forwarding module 56 receives after the response message of the second invitation message at the 3rd receiver module 55, after the media resource information of this response message is modified according to standard procedure, the response message using it as the first invitation message, sends to ICS UE.

Wherein, sending module 52 is before transmission sends Transfer Message to CS-IMS conversion equipment, need first this Transfer Message to be arranged, and then the Transfer Message setting is sent to CS-IMS conversion equipment, therefore, as shown in Figure 5 B, sending module 52 can comprise: submodule 522 is set and for the session identification of Transfer Message, is set to the session identification of setting up between this AS and CS-IMS conversion equipment, and according to this session identification, the target of Transfer Message is set, wherein, above-mentioned session is that the calling party by the first message is that ICS UE sets up; Send submodule 524 and submodule 522 is set is connected, for the Transfer Message that submodule 522 settings are set is sent to CS-IMS conversion equipment.

In like manner, the first forwarding module 54 is before forwarding the second invitation message, first to obtain the callee of this message, therefore, as shown in Figure 5 B, the first forwarding module 54 can comprise: obtain submodule 542, for the source of the second invitation message or the target of the second invitation message receiving according to the second receiver module 53, obtain the sign of object UE; Forward submodule 544 and obtain submodule 542 and be connected, for according to the sign of object UE, the second invitation message is transmitted to object UE.

According to the AS of the embodiment of the present invention, can when receiving the invitation message of ICS UE, to CS-IMS conversion equipment, send Transfer Message, notice CS-IMS conversion equipment sends invitation message to object UE.

According to the embodiment of the present invention, a kind of CS-IMS conversion equipment is also provided, for after receiving the notice of application server, to object UE, send invitation message.This CS-IMS conversion equipment is preferably connected with above-mentioned application server, and is used in conjunction with above-mentioned application server.

Fig. 6 A is according to the structured flowchart of the CS-IMS conversion equipment of the embodiment of the present invention, Fig. 6 B is the structured flowchart of CS-IMS conversion equipment according to the preferred embodiment of the invention, as shown in Figure 6A, according to the CS-IMS conversion equipment of the embodiment of the present invention, comprise: receiver module 62 and sending module 64.Further combined with accompanying drawing, above-mentioned modules is described below.

Receiver module 62, the Transfer Message sending for receiving AS;

Sending module 64 is connected with receiver module 62, for the Transfer Message receiving according to receiver module 62, to the transmission invitation message that diverts the aim of this Transfer Message.

Particularly, as shown in Figure 6B, sending module 64 can comprise: submodule 642 is set for according to the session identification of Transfer Message, the source of invitation message is set, and the target of invitation message is set according to diverting the aim of Transfer Message; Send submodule 644 and submodule 642 is set is connected, for sending the invitation message that submodule 644 settings are set.

According to the embodiment of the present invention, a kind of call connected system is also provided, for realizing ICSUE, be connected with the call of object UE.

Fig. 7 is according to the structured flowchart of the call connected system of the embodiment of the present invention, as shown in Figure 7, according to the call connected system of the embodiment of the present invention, comprises: ICS UE 72, AS 74, CS-IMS conversion equipment 76 and object UE 78.Further combined with accompanying drawing, above-mentioned each entity is described below.

ICS UE 72, for sending the first invitation message to object UE 78;

AS 74, for after receiving above-mentioned the first invitation message, to CS-IMS conversion equipment 76, send Transfer Message, and after the response message receiving from object UE 78, send the response message of above-mentioned the first invitation message to ICS UE 72;

CS-IMS conversion equipment 76, after the Transfer Message receiving from AS 74, sends the second invitation message according to diverting the aim of Transfer Message to object UE 78;

Object UE 78, for after receiving described the second invitation message forwarding through described AS, returns to response message to described ICS UE.

In specific implementation process, ICS UE 72 sends the first invitation message to object UE 78, this first invitation message is after S-CSCF, S-CSCF is according to pre-configured service trigger criteria, this first invitation message is transmitted to AS 74, AS 74 determines that the promoter of this first invitation message is that ICS UE 72 is the terminal of IMS centralized traffic, and existed call to connect, therefore, AS 74 sends Transfer Message to CS-IMS conversion equipment 76, notice CS-IMS conversion equipment 76 sends the second invitation message to object UE 78, CS-IMS conversion equipment 76 sends the second invitation message according to receiving Transfer Message to object UE 78, this second invitation message arrives after AS 74, AS 74 is transmitted to object UE 78 by this second invitation message, UE 78 returns to the response message of this second invitation message, this response message arrives after AS 74, this response message is sent to CS-IMS conversion equipment 76, simultaneously, AS74 revises the media resource information in this response message by standard procedure after, response message as the first invitation message sends to ICS UE 72.

In specific implementation process, CS-IMS conversion equipment 76 can be also the transfer gateway (MGCF/MGW) of IMS network for the MSCe of CS network, also can coordinating for MSCe and transfer gateway.

According to the embodiment of the present invention, a kind of call connection method is also provided, and the method can be used device (referring to the IC-IMS conversion equipment in the application server in Fig. 5 A, 5B and Fig. 6 A, 6B) or the system (referring to Fig. 7) that above-described embodiment provides to realize.

Fig. 8 is according to the flow chart of the call connection method of the embodiment of the present invention, as shown in Figure 8, according to the call connection method of the embodiment of the present invention, mainly comprises following processing (step 802-step 806):

Step 802:AS receives the first invitation message that ICS UE sends to object UE, and sends Transfer Message to CS-IMS conversion equipment, and wherein, this Transfer Message is used to indicate CS-IMS conversion equipment and sends the second invitation message to object UE;

Step 804:AS receives the second invitation message that CS-IMS conversion equipment sends to object UE, and the second invitation message is transmitted to object UE;

Second response message of step 806:AS receiving target UE to the second invitation message, and send the first response message to the first invitation message to ICS UE.

Further describe the above-mentioned details that each is processed below.

(1) step 802

ICS UE is the in the situation that of existing CS media link, to object UE, make a call, to object UE, send the first invitation message, in specific implementation process, the first invitation message that ICS UE sends to object UE can be that invitation (INVITE) message can be also heavily to invite (re-INVITE) message, first this first invitation message arrives S-CSCF, and S-CSCF, according to pre-configured service trigger criteria, is transmitted to AS by this first invitation message.

AS receives after this first invitation message, the promoter who determines this first invitation message is that ICS UE is the terminal of IMS centralized traffic, and has existed call to connect, therefore, AS sends Transfer Message to CS-IMS conversion equipment, and notice CS-IMS conversion equipment sends the second invitation message to object UE.

Before AS sends Transfer Message to CS-IMS conversion equipment, first AS arranges the association attributes of this Transfer Message.First, in order to identify Transfer Message and the first invitation message, belong to a session, the session identification of this Transfer Message of AS is set to, by the AS of ICSUE (i.e. the promoter of the first invitation message) foundation and the session identification of the session between CS-IMS conversion equipment, then the target of this Transfer Message (being callee) is set to above-mentioned ICS UE or CS-IMS conversion equipment; Or AS also can arrange incomplete session identification by the session identification of Transfer Message, at this moment, the target that AS can only this Transfer Message is set to above-mentioned ICS UE.

And, AS can obtain the target (being object UE) of the first invitation message from session identification, and be set to diverting the aim of above-mentioned Transfer Message, or, AS also can be set to diverting the aim of Transfer Message to point to the special identifier of AS, this signature identification and the first invitation message target--object UE is associated.

If above-mentioned the first invitation message that ICS UE sends is re-INVITE message, AS also by above-mentioned session identification as an alternative session identification be carried in Transfer Message, then AS sends to CS-IMS conversion equipment by the Transfer Message setting.

(2) step 804

CS-IMS conversion equipment is after receiving the Transfer Message of AS, determine and will send the second invitation message, CS-IMS conversion equipment is according to the session identification of the target of this Transfer Message or Transfer Message, can be associated with above-mentioned ICS UE, and this ICS UE is set to the source of the second invitation message, meanwhile, the target of Transfer Message is set to the target (i.e. the callee of the second invitation message) of the second invitation message.

And if above-mentioned Transfer Message carries replacement session identification, above-mentioned the second invitation message is re-INVITE message, the session identification of CS-IMS the second invitation message is set to this replacement session identification.After setting completes, CS-IMS sends to its callee (being object UE) by this second invitation message, and this second invitation message, after S-CSCF, arrives AS.

AS, according to the target of the source of the second invitation message or the second invitation message, can obtain the target identification of the first invite request message--the sign of object UE, and the second invitation message is transmitted to object UE.

(3) step 806

Object UE is after receiving the second invitation message, second response message of transmission to the second invitation message, in this response message, carry the media resource information of object UE, this second invitation message arrives after AS, AS sends to CS-IMS conversion equipment by this second response message, and, after the media resource information in this second response message is revised by standard procedure, as the first response message of the first invitation message, send to ICS UE.

According to the said method of the embodiment of the present invention, AS is receiving ICS UE after the invitation message of object UE transmission, and notice CS-IMS conversion equipment sends invitation message to object UE, does not need to carry out the heavily negotiation of media resource.

In order further to understand the embodiment of said method, with specific embodiment, describe below.

Embodiment mono-

In the present embodiment, described after having set up call between ICS UE-A and UE-B, ICSUE-A sends in order to keep the invitation message of call to UE-B, call is placed in to hold mode, then to UE-B, send in order to activate the invitation message of call, the flow process that call is activated, the particular flow sheet that Fig. 9 is the present embodiment again, as shown in Figure 9, mainly comprise the steps:

Step 901, ICS UE-A set up with the call of UE-B and are connected according to the IMS centralized traffic process of standard (the described process of above-mentioned Fig. 3 or Fig. 4), this connection comprises two sections of media links, one section is the CS media link of ICS UE-A and MSCe or MGW, and one section is the IMS media link of MSCe or MGW and UE-B;

Step 902, ICS UE-A initiate the first invitation message to keep call with IMS signaling to UE-B, media resource information in this invitation message carries the sign that indication keeps call, this invitation message is by way of S-CSCF, and S-CSCF, according to service trigger criteria, is transmitted to AS by this invitation message.

In practical operation, this invitation message can be re-INVITE (heavily invite, belong to special invitation) message, and in the media resource information of this re-INVITE message, " sendonly " value is set in " a=" row, and indication keeps call.

Step 903, AS send Transfer Message to MSCe or MGCF;

In practical operation, Transfer Message may be REFER (transfer) message.Wherein, the session identification of this Transfer Message can be the sign of the session of having set up between AS and MGCF or MSCe, and this session set up by ICS UE-A, can be also incomplete session identification.

When the session identification of this Transfer Message is the sign of the session of having set up between AS and MGCFF or MSCe, the target of this Transfer Message (the To territory of message or Request-URI territory) can be ICS UE-A, can be also MSCe or MGCF; When the session identification of this Transfer Message is incomplete session identification, the target of this Transfer Message is ICSUE-A.

And, in this Transfer Message, carrying replacement session identification, this replacement session identification is also the sign of the session of having set up between AS and MGCF or MSCe, and this session is set up by ICSUE-A.

And, target (the To territory of invitation message)--the UE-B of the first invitation message that AS can also be set to diverting the aim in Transfer Message (the Refer-To territory of message) receive, also can be set to point to by diverting the aim the special identifier of AS, this special identifier and invitation message target--UE-B is associated.

Step 904, MSCe or MGCF receive this Transfer Message, and send to AS the message of agreeing to transfer, such as sending " 200 OK " message;

Step 905, MSCe or MGCF send the second invitation message to diverting the aim of this Transfer Message.

MSCe or MGCF can be associated with ICS UE-A according to the session identification of the target of Transfer Message or Transfer Message, owing to carrying replacement session identification in Transfer Message, therefore, the second invitation message that MSCe or MGCF send is re-INVITE message in practice, and the session identification of this second invitation message is the replacement session identification carrying in Transfer Message.And MSCe or MGCF are usingd ICS UE-A as the source of invitation message, take diverting the aim in Transfer Message--the target that UE-B is invitation message, in this second invitation message, carry the media resource information of MSCe or MGW simultaneously.

Step 906, the second invitation message arrive AS by way of S-CSCF, AS can obtain target--the UE-B of the first invitation message in step 902 according to the target of invitation message (the To territory of invitation message), then to UE-B, forward this second invitation message, in order to make call in hold mode, AS is revised as hold mode by the media resource information in the second invitation message, in practice, can will in " a=" row in media resource information, " sendonly " value be set.

Step 907, UE-C receive the second invitation message, send response message, as send " 200OK " message of IMS, this response message belongs to the final response message of the first invitation message, in this response message, carry the media resource information of UE-B, because the media resource information in the second invitation message of receiving is hold mode, so will be set to " recvonly " in " a=" of the media resource information of this response message row, this response message arrives AS by way of S-CSCF;

Step 908, AS receive after this response message, and this response message is transmitted to MSCe or MGCF;

Step 909, when this response message is transmitted to MSCe or MGCF, AS revises the media resource information in this response message by standard procedure after, as the response message of the first invitation message, send to ICS UE-A.

So far, ICS UE-A kept with UE-C between call be connected, now in IMS media link, do not have media data to transmit.

Step 910, ICS UE-A initiate the 3rd invitation message to activate call with IMS signaling to UE-B, as send re-INVITE message, in the media resource information of the 3rd invitation message, carry indication and activate the sign of conversing, as value of " a=" row in can media resource information is set to " sendrecv ", the 3rd invitation message is by way of S-CSCF, S-CSCF, according to service trigger criteria, forwards this message to AS.

Step 911, AS send Transfer Message to MSCe or MGCF.

Equally, the session identification of this Transfer Message can be the sign of the session of having set up between AS and MGCF or MSCe, and this session set up by ICS UE-A, can be also incomplete session identification.Accordingly, during the sign that is the session of having set up at the session identification of this Transfer Message, the target of this Transfer Message (being To territory or the Request-URI territory of Transfer Message) can be ICS UE-A, can be also MSCe or MGCF; When the session identification of this Transfer Message is incomplete session identification, the target of this Transfer Message is ICSUE-A.

And, in this Transfer Message, carry replacement session identification, this replacement session identification is the sign of the session of having set up between AS and MGCF or MSCe, and this session is set up by ICSUE-A, simultaneously AS can also be by the target of the 3rd invitation message receiving (the To territory of invitation message)--and UE-B is made as divert the aim (the Refer-To territory of message) of this Transfer Message, also can be set to point to by diverting the aim the special identifier of AS, this special identifier and invitation message target--UE-B is associated.

Step 912, MSCe or MGCF receive after this Transfer Message, send the message of agreeing to transfer, as " 200OK " message to AS.

Step 913, MSCe or MGCF send the 4th invitation message.

MSCe or MGCF can be associated with ICS UE-A according to the session identification of the target of this Transfer Message or Transfer Message, and owing to carrying replacement session identification in this Transfer Message, therefore, it is re-INVITE message that MSCe or MGCF send invitation message, the session identification of the 4th invitation message is the replacement session identification carrying in the Transfer Message receiving, and MSCe or MGCF are usingd the source of ICS UE-A as the 4th invitation message, take diverting the aim as the target of the 4th invitation message in Transfer Message, carry the media resource information of MSCe or MGW simultaneously.

Step 914, the 4th invitation message arrive AS by way of S-CSCF, AS can obtain target--the UE-B of the 3rd invitation message of step 910 according to the target of the 4th invitation message (the To territory of invitation message), then to UE-B, forward the 4th invitation message, in order to activate call, AS is revised as state of activation by the media resource information in the 4th invitation message, as " sendrecv " value is set in " a=" row.

Step 915, UE-B receive the 4th invitation message, send response message, as sent " 200 OK " message of IMS, this message belongs to the final response message of the 4th invitation message, the media resource information that carries UE-B in this response message, this response message arrives AS by way of S-CSCF.

Step 916, AS receive after this response message, response message are transmitted to MSCe or MGCF.

Step 917, AS revise the media resource information in response message by standard procedure after, then send to ICS UE-A as the response message of the 3rd invitation message.

So far, ICS UE-A activated with UE-B between call be connected.

Embodiment bis-

In the present embodiment, described between ICS UE-A and UE-B and set up after call, ICSUE-A initiates again the calling of UE-C to set up the process of Three-Way Calling, and Figure 10 is that in the embodiment of the present invention, ICS UE-A sets up the flow chart that tripartite passes through, and mainly comprises the steps: as shown in figure 10

Step 1001, ICS UE-A set up with the call of UE-B and are connected according to the IMS centralized traffic process of standard, this connection comprises two sections of media links, one section is the CS media link of ICS UE-A and MSCe or MGW, one section is the IMS media link of MSCe or MGW and UE-B, in order to initiate new calling, ICS UE-A will be placed in hold mode with the call of UE-B, and therefore, IMS media link does not have media data to transmit;

Step 1002, ICS UE-A initiate the first invitation message with IMS signaling to UE-C, and as sent INVITE (invitation) message, this invitation message is by way of S-CSCF, and S-CSCF, according to service trigger criteria, forwards this invitation message to AS;

Step 1003, AS determine that the calling subscriber of this calling is ICS UE, and this ICS UE existed call to connect, and to MSCe or MGCF, send Transfer Message.

Wherein, the session identification of this Transfer Message can be the sign of the session of having set up between AS and MGCF or MSCe, and this session is set up by ICS UE-A, now the target of message (the To territory of message or Request-URI territory) can be ICS UE-A, can be also MSCe or MGCF; The session identification of this Transfer Message can be also incomplete session identification, and now the target of message is ICS UE-A.

And, before sending this Transfer Message, AS can also be set to diverting the aim in Transfer Message (the Refer-To territory of message) target (the To territory of invitation message)--the UE-C of the first invitation message, also can be set to point to by diverting the aim the special identifier of AS, this special identifier and invitation message target--UE-C is associated.

Step 1004, MSCe or MGCF receive Transfer Message, send the message of agreeing to transfer, as " 200 OK " message to AS;

Step 1005, MSCe or MGCF send the second invitation message.

Before sending the second invitation message, MSCe or MGCF can obtain according to the session identification of the target of Transfer Message or Transfer Message the information of ICS UE-A, and ICSUE-A is set to the source of the second invitation message, diverting the aim of the Transfer Message receiving is set to the target of the second invitation message, and in the second invitation message, carries the media resource information of MSCe or MGW.

The second invitation message is by way of S-CSCF, and S-CSCF, according to the service trigger criteria configuring, is transmitted to AS by this second invitation message.

Step 1006, AS are transmitted to UE-C by the second invitation message.

AS, according to the source ICS UE-A of this second invitation message, is associated with the first invitation message in step 1002, thereby then the target of the first invitation message--UE-C in obtaining step 1002 forwards invitation message to UE-C; Or if in step 1003, AS is set to diverting the aim of Transfer Message to point to the special identifier of AS, AS, according to the target of the second invitation message, is associated with the first invitation message in step 1002, and obtains target--the UE-C of the first invitation message.

Step 1007, UE-C receive the second invitation message, and send the response message of corresponding this second invitation message.

This response message belongs to the final response message of the second invitation message, carries the media resource information of UE-C in this response message, and this response message arrives AS by way of S-CSCF.

Step 1008, AS receive this response message, and this response message is transmitted to MSCe or MGCF.

Step 1009, AS revise the media resource information in this response message by standard procedure after, then send to ICS UE-A as the response message of the first invitation message.

So far, set up call and is connected between ICS UE-A and UE-C, call connection comprises two sections of media links, and one section is existing CS media links, and one section is new IMS media links.

Embodiment tri-

In the present embodiment, described and all set up after session as UE-B and ICS UE-A and UE-C, ICS UE-A has been transferred to the process with UE-C call, the flow chart that Figure 11 is the present embodiment, as shown in figure 11, the idiographic flow of the present embodiment mainly comprises the steps:

Step 1101, UE-B set up with the call of ICSUE-A and are connected according to the IMS centralized traffic process of standard, this connection comprises two sections of media links, one section is the CS media link of ICS UE-A and MSCe or MGW, one section is the IMS media link of MSCe or MGW and UE-B, in order to initiate new calling, UE-B will be placed in hold mode with the call of ICS UE-A, so IMS media link do not have media data to transmit, and the session identification between UE-B and ICS UE-A is D1.

Step 1102, UE-B set up with the call of UE-C and are connected according to the IMS process of standard, and UE-B will be placed in hold mode with the call of UE-C, and the session identification between UE-B and UE-C is D2.

Step 1103, UE-B carry out enquiry switching service according to the IMS enquiry switching service logic of standard, to ICS UE-A, send Transfer Message, such as sending REFER message, carry and replace session identification D2 in this transforming message.

Step 1104, this Transfer Message, by way of S-CSCF, arrive AS, and AS is transmitted to ICS UE-A by this Transfer Message.

Step 1105～1106, ICS UE-A send the message of agreeing to transfer, and such as sending " 200OK " message, message travels S-CSCF and AS, finally arrive UE-B.

Step 1107, ICS UE-A send the first invitation message, divert the aim (the Refer-To territory) that the target of this invitation message (To territory) is Transfer Message, and, in this invitation message, carrying and replace session identification D2, this invitation message arrives AS via S-CSCF.

Step 1108, AS determine that this first calling subscriber who invites is ICS UE, and this ICSUE existed call to connect, and therefore, AS sends Transfer Message to MSCe or MGCF.

Wherein, the session identification of this Transfer Message can be the sign of the session of having set up between AS and MGCF or MSCe, and this session is set up by ICS UE-A, now the target of message (the To territory of message or Request-URI territory) can be ICS UE-A, can be also MSCe or MGCF; This Transfer Message can be also incomplete session identification, and now the target of message is ICS UE-A.And, AS can also be made as diverting the aim in Transfer Message (the Refer-To territory of message) target (the To territory of invitation message)--the UE-C of invitation message, also can be made as by diverting the aim the special identifier of pointing to AS, this special identifier and invitation message target--UE-C is associated.

Step 1109, MSCe or MGCF receive Transfer Message, send and agree to that the message shifting is to AS.

Step 1110, MSCe or MGCF send the second invitation message.

MSCe or MGCF can be associated with ICS UE-A according to the session identification of the target of Transfer Message or Transfer Message, therefore, MSCe or MGCF ICS UE-A are set to the source of the second invitation message, diverting the aim in Transfer Message is set to the target of the second invitation message, the media resource information of carrying MSCe or MGW in the second invitation message simultaneously.

The second invitation message is by way of S-CSCF, and S-CSCF, according to the service trigger criteria configuring, is transmitted to AS by the second invitation message.

Step 1111, AS are according to the target (To territory) of the source ICS UE-A of the second invitation message or the second invitation message, be associated with the first invitation message of step 1107, the target of the first invitation message in obtaining step 1107--UE-C and replacement session identification D2, then forward and carry second invitation message of replacing session identification D2 to UE-C.

Step 1112, UE-C receive the second invitation message, send response message, and this response message belongs to the final response message of the second invitation message, carries the media resource information of UE-C in this response message, and message travels S-CSCF arrives AS.

Step 1113, AS receive this response message, and response message is transmitted to MSCe or MGCF;

Step 1114, AS send to ICS UE-A as replying of the first invitation message after the media resource information in this response message is revised by standard procedure;

Step 1115, UE-C are according to the replacement session identification D2 of the second invitation message of receiving, to UE-B, send the message that stops session, stop D2 session, as sent BYE (termination) message with D2 session identification, the other end UE-B of D2 session will receive this termination messages.

Step 1116, UE-B receive the message that stops session, and send the message of agreeing to stop session, as sent " 200OK " message.

So far, set up call and is connected between ICS UE-A and UE-C, call connects and comprises two sections of media links, and one section is existing CS media links, and one section is new IMS media links, and the IMS media links between original UE-B of while and UE-C has been terminated.

As mentioned above, by the present invention, AS is receiving ICS UE after the invitation message of object UE transmission, notice CS-IMS conversion equipment sends invitation message to object UE, rather than as currently used technology, acts on behalf of CS-IMS conversion equipment and send invitation message to object UE, thereby can set up being connected between ICS UE and object UE without heavily consult in the situation that, therefore, save the time that call connects, improved the efficiency that call connects, improved user's experience.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. a call connection method, is applied to comprise it is characterized in that the system of user terminal ICS UE, application server AS, circuit domain CS-IP multimedia subsystem, IMS conversion equipment and the object UE of IP Multimedia System centralized traffic, and described method comprises:

Described AS receives the first invitation message that described ICS UE sends to described object UE, and sends Transfer Message to described CS-IMS conversion equipment, and wherein, described Transfer Message is used to indicate described CS-IMS conversion equipment and sends the second invitation message to described object UE;

Described AS receives the second invitation message that described CS-IMS conversion equipment sends to described object UE, and described the second invitation message is transmitted to described object UE;

Described AS receives second response message of described object UE to described the second invitation message, and sends the first response message to described the first invitation message to described ICS UE.

2. method according to claim 1, is characterized in that, before described AS sends Transfer Message to described CS-IMS conversion equipment, described method also comprises:

The session identification of the described Transfer Message of described AS is set to the session identification of the session of setting up between this AS and described CS-IMS conversion equipment, and according to described session identification, diverting the aim of described Transfer Message is set, wherein, described session is set up by the calling party of described the first invitation message;

Described AS arranges diverting the aim of described Transfer Message according to the target of the first invitation message.

3. method according to claim 2, is characterized in that, before described AS receives the second invitation message that described CS-IMS conversion equipment sends to described object UE, described method also comprises:

Described CS-IMS conversion equipment arranges the source of described the second invitation message according to the session identification of described Transfer Message, and the target of described the second invitation message is set according to diverting the aim of described Transfer Message;

Described AS sends described the second invitation message according to arranging.

4. method according to claim 3, is characterized in that, described AS is transmitted to described object UE by the second invitation message, specifically comprises:

Described AS, according to the target of the source of described the second invitation message or described the second invitation message, obtains the sign of described object UE;

Described AS, according to the sign of described object UE, is transmitted to described object UE by described the second invitation message.

5. according to the method described in any one in claim 1 to 4, it is characterized in that, diverting the aim as the target of described the first invitation message of described Transfer Message, or point to the special identifier of described AS, this special identifier is associated with the target of described the first invitation message.

6. method according to claim 5, is characterized in that, described CS-IMS conversion equipment comprises: the transfer gateway that strengthens mobile switching centre and/or IMS network.

7. an application server, is characterized in that, comprising:

The first receiver module, the first invitation message sending to object UE for receiving the user terminal ICS UE of IP Multimedia System centralized traffic;

Sending module, for receiving after described the first invitation message at described the first receiver module, to circuit domain CS-IP multimedia subsystem, IMS conversion equipment, send Transfer Message, wherein, described Transfer Message is used to indicate described CS-IMS conversion equipment and sends the second invitation message to diverting the aim of described Transfer Message;

The second receiver module, for receiving described CS-IMS conversion equipment to described the second invitation message that diverts the aim and send;

The first forwarding module, sends to described object UE for described the second invitation message that described the second receiver module is received;

The 3rd receiver module, for receiving the response message of described second invitation message of described object UE transmission;

The second forwarding module, for receiving after described response message at described the 3rd receiver module, sends the response message of described the first invitation message to described ICS UE.

8. application server according to claim 7, is characterized in that, described sending module comprises:

Submodule is set, session identification for described Transfer Message is set to the session identification of setting up between described application server and described CS-IMS conversion equipment, and according to described session identification, the target of described Transfer Message is set, wherein, described session is set up by described ICS UE;

Send submodule, for the described Transfer Message that submodule setting is set is sent to described CS-IMS conversion equipment.

9. application server according to claim 7, is characterized in that, described the first forwarding module comprises:

Obtain submodule, for the source of described the second invitation message or the target of described the second invitation message receiving according to described the second receiver module, obtain the sign of described object UE;

Forward submodule, for according to the sign of described object UE, described the second invitation message is transmitted to described object UE.

10. a call connected system, is characterized in that, comprising: user terminal ICS UE, application server AS, circuit domain CS-IP multimedia subsystem, IMS conversion equipment and the object UE of IP Multimedia System centralized traffic, wherein,

Described ICS UE, for sending the first invitation message to described object UE;

Described AS, for after receiving described the first invitation message, sends Transfer Message to described CS-IMS conversion equipment, and after the response message receiving from described object UE, sends the response message of described the first invitation message to described ICS UE;

Described CS-IMS conversion equipment, after the Transfer Message receiving from described AS, sends the second invitation message according to diverting the aim of described Transfer Message to described object UE;

Described object UE, for after receiving described the second invitation message forwarding through described AS, returns to response message to described ICS UE.