CN101577883A

CN101577883A - Method, device and system for talking connection

Info

Publication number: CN101577883A
Application number: CN 200810146073
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: 2009-11-11
Anticipated expiration: 2028-08-07
Also published as: CN101577883B

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 message to 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 the 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, abbreviate IP as) IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem, abbreviate IMS as) be by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, this system constructing a kind of opening and service environment flexibly, supporting multimedia application can provide abundant multimedia service for the 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 is used for professional triggering and control, abbreviate CSCF as), and CSCF can be divided into proxy CSCF (Proxy CSCF, abbreviate P-CSCF as), inquiry CSCF (Interrogating CSCF, abbreviate I-CSCF as) and serving CSCF (Serving CSCF abbreviates S-CSCF as).And operation layer mainly comprises a series of application server (Application Server abbreviates AS as), is used to the service business that provides concrete, and AS can be an independent entity, also may reside among the S-CSCF.

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

ICS UE-A sets up conversation by the 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 that the IMS media link is connected with existing CS media link, two kinds of implementation methods are arranged in the prior art, be described respectively below.

Fig. 1 is that prior art one realizes the flow chart that the IMS media link is connected with existing CS media link, as shown in Figure 1, comprise that mainly 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 an entity, the transfer gateway of MSCe and IMS network are expressed as an entity):

Step 101, ICS UE-A set up according to the IMS centralized traffic process of standard and are connected with the conversation of UE-B, this connection comprises two sections 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 initiate new calling, ICS UE-A will place hold mode with the conversation of UE-B, and therefore, the IMS media link does not have media data to transmit;

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

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

Step 104, UE-C answering call, such as " 200OK " message that sends 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;

The media resource information of the UE-C that step 106, AS basis are received sends the IMS signaling of upgrading the IMS media link to MSCe or MGCF, such as sending UPDATE (renewal) message, carries the media resource information of UE-C in this message;

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

If the media resource information 2 in the step 107 is identical with media resource information 1 in the step 103, then having set up conversation between ICS UE-A and UE-C is connected, this conversation connects and comprises two sections 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 the step 107 is different with media resource information 1 in the step 103, then can't set up the IMS media links of MSCe or MGW and UE-C, also just can't realize conversing between ISC UE-A and the UE-C, 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 the 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 among Fig. 1;

Step 206, AS send recall 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 " 200OK " message, carry the media resource information of UE-C in this message;

Step 208, AS receive response message, send recall request to MSCe or MGCF, 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, carry the media resource information of MSCe or MGW in this message;

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

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

So far, set up conversation between ICS UE-A and UE-C and has been connected, the conversation connection comprises two sections 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, could really realize conversation then, increased the reciprocal process with UE-C, prolonged the time of realizing conversation, reduced the efficient of system, reduced user experience.

Summary of the invention

In view of this, the invention provides a kind of conversation connectivity scenario, the incomplete negotiation owing to media resource causes the conversation connection unsuccessful in the prior art in order to solve, or owing to the lower problem of efficient that need heavily consult to cause.

According to an aspect of the present invention, a kind of call connection method is provided, and this 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 first invitation message that ICS UE sends to object UE, and to CS-IMS conversion equipment transmission Transfer Message, wherein, Transfer Message is used to indicate the CS-IMS conversion equipment to send second invitation message to object UE; AS receives second invitation message that the CS-IMS conversion equipment sends to object UE, and second invitation message is transmitted to object UE; AS receiving target UE is to second response message of second invitation message, and sends first response message to first invitation message to ICS UE.

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

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

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: receiver module is used to receive the Transfer Message that AS sends; Sending module is used for stating Transfer Message according to what receiver module received, to the transmission invitation message that diverts the aim of Transfer Message.

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

Conversation connected system according to the present invention comprises: ICS UE is used for sending first invitation message to object UE; AS is used for after receiving first invitation message, sends Transfer Message to the CS-IMS conversion equipment, and behind the response message that receives from object UE, sends the response message of first invitation message to ICSUE; The CS-IMS conversion equipment is used for behind the Transfer Message that receives from AS, sends second invitation message according to diverting the aim of Transfer Message to object UE; Object UE is used for returning response message receiving after second invitation message that AS transmits to ICS UE.

By above-mentioned at least one technical scheme of the present invention, initiate invitation message by AS notice CS-IMS conversion equipment to object UE, be connected with medium between the object UE to set up the CS-IMS conversion equipment, thereby, can under the situation that need not heavily to consult, set up ICS

Being connected between UE and the object UE, thus the efficient that conversation connects improved.

Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.

Description of drawings

Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:

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

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

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

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

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

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

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

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

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

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

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

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

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

Embodiment

Functional overview

As mentioned above, in the IMS business system, when realizing that newly-built IMS media link is connected with existing CS media link, because the media resource information reconciliation is imperfect, and cause may occurring realizing that conversation connects or owing to heavily consult after object UE is replied, and problem such as the process that connects of causing realizing conversing is tediously long.At the problems referred to above, the present invention proposes a kind of scheme of conversing and connecting, in the conversation connectivity scenario that the embodiment of the invention provides, AS is receiving ICS UE after the invitation message that object UE sends, notice CS-IMS conversion equipment sends invitation message to object UE, rather than as currently used technology, act on behalf of the CS-IMS conversion equipment and send invitation message, thereby being connected between ICS UE and the object UE can set up under the situation that need not heavily to consult to object UE.

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

Fig. 3 realizes the network architecture diagram of IMS centralized traffic by the transfer gateway of IMS network for ICS UE, 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 back foundation and the media path of UE-B conversation, it is as follows that index map 3, the ICS UE-A transfer gateway by the IMS network and IMS terminal UE-B set up the process of conversing:

Step 301, ICS UE-A call out UE-B by the 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 judges that the calling subscriber can not set up the IMS media channel, sends the IMS signaling message to ICS UE-A, 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 ICS UE-A along 302 among Fig. 3,301 path;

Step 303, ICS UE-A make a call to special number by the 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 the MGW;

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

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

Step 307, AS are associated with the signaling message of step 302 according to the special number in the 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 conversation of ICS UE-A and UE-B by conversion IMS media protocol and CS media protocol, sets up conversation between ICS UE-A and the UE-B and is connected, this connection comprises in two sections medium chains

Fig. 4 realizes the network architecture diagram of IMS centralized traffic by the MSCe of CS network for ICS UE, 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 back foundation and the media path of UE-B conversation, compare with Fig. 3, Fig. 4 is realized the effect of the transfer gateway (comprising MGCF and MGW) of IMS with the transfer gateway that MSCe replaces the IMS network by MSCe.ICS UE-A is similar to Fig. 3 to the process that IMS terminal UE-B sets up conversation by the MSCe of CS network, is not giving unnecessary details at this.

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

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

First receiver module 51 is used to receive first invitation message that ICS UE sends to object UE;

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

Second receiver module 53 is used to receive the CS-IMS conversion equipment to described second invitation message that diverts the aim and send;

First forwarding module 54 is connected with second receiver module 53, is used for second invitation message that second receiver module 53 receives is sent to object UE;

The 3rd receiver module 55 is used for the response message of second invitation message that receiving target UE sends;

Second transmits 56 of moulds is connected with the 3rd receiver module 55, is used for sending the response message of first invitation message to ICS UE after the 3rd receiver module receives response message.

In specific implementation process, second forwarding module 56 is after the 3rd receiver module 55 receives the response message of second invitation message, after the media resource information of this response message made amendment according to standard procedure,, send to ICS UE with its response message as first invitation message.

Wherein, sending module 52 was sending before the CS-IMS conversion equipment sends Transfer Message, need earlier this Transfer Message to be provided with, and then the Transfer Message that sets sent to the CS-IMS conversion equipment, therefore, shown in Fig. 5 B, sending module 52 can comprise: session identification that submodule 522 is used for Transfer Message is set is set to the session identification set up between this AS and the 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 first message is that ICS UE sets up; Send submodule 524 and submodule 522 is set is connected, the Transfer Message that is used for being provided with submodule 522 settings sends to the CS-IMS conversion equipment.

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

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

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

Fig. 6 A is the structured flowchart according to the CS-IMS conversion equipment of the embodiment of the 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, the CS-IMS conversion equipment according to the embodiment of the invention comprises: receiver module 62 and sending module 64.Below further combined with accompanying drawing above-mentioned each module is described.

Receiver module 62 is used to receive the Transfer Message that AS sends;

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

Particularly, shown in Fig. 6 B, sending module 64 can comprise: submodule 642 is set is used for session identification according to 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, be used to send the invitation message that submodule 644 settings are set.

According to the embodiment of the invention, a kind of conversation connected system also is provided, be used to realize that ICSUE is connected with the conversation of object UE.

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

ICS UE 72 is used for sending first invitation message to object UE 78;

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

CS-IMS conversion equipment 76 is used for behind the Transfer Message that receives from AS 74, sends second invitation message according to diverting the aim of Transfer Message to object UE 78;

Object UE 78 is used for returning response message receiving after described second invitation message that described AS transmits to described ICS UE.

In specific implementation process, ICS UE 72 sends first invitation message to object UE 78, this first invitation message is behind 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 conversation to connect, therefore, AS 74 sends Transfer Message to CS-IMS conversion equipment 76, notice CS-IMS conversion equipment 76 sends second invitation message to object UE 78, CS-IMS conversion equipment 76 sends second invitation message according to receiving Transfer Message to object UE 78, after this second invitation message arrives AS 74, AS 74 is transmitted to object UE 78 with this second invitation message, UE 78 returns the response message of this second invitation message, after this response message arrives 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, send to ICS UE 72 as the response message of first invitation message.

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

According to the embodiment of the invention, a kind of call connection method also is provided, device (referring to the IC-IMS conversion equipment among the application server among Fig. 5 A, the 5B and Fig. 6 A, the 6B) or system (referring to Fig. 7) that this method can use the foregoing description to provide realize.

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

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

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

Step 806:AS receiving target UE is to second response message of second invitation message, and sends first response message to first invitation message to ICS UE.

Further describe above-mentioned each details of handling below.

(1) step 802

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

After AS receives 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 conversation to connect, therefore, AS sends Transfer Message to the CS-IMS conversion equipment, and notice CS-IMS conversion equipment sends second invitation message to object UE.

Before the CS-IMS conversion equipment sent Transfer Message, AS at first was provided with the association attributes of this Transfer Message at AS.At first, belong to a session in order to identify the Transfer Message and first invitation message, the session identification of this Transfer Message of AS is set to by the AS of ICSUE (i.e. the promoter of first invitation message) foundation and the session identification of the session between the CS-IMS conversion equipment, and the target (being the callee) with this Transfer Message is set to above-mentioned ICS UE or CS-IMS conversion equipment then; Perhaps, AS also can be provided with the session identification of Transfer Message incomplete session identification, and at this moment, AS can only be above-mentioned ICS UE with the Target Setting of this Transfer Message.

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

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

(2) step 804

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

And if above-mentioned Transfer Message carries the replacement session identification, then above-mentioned second invitation message is a re-INVITE message, and the session identification of CS-IMS second invitation message is set to this replacement session identification.After setting was finished, CS-IMS sent to its callee (being object UE) with this second invitation message, and this second invitation message arrives AS behind S-CSCF.

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

(3) step 806

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

According to the said method of the embodiment of the invention, AS is receiving ICS UE after the invitation message that object UE sends, 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, describe with specific embodiment below.

Embodiment one

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

Step 901, ICS UE-A set up with the conversation of UE-B according to the IMS centralized traffic process (the described process of above-mentioned Fig. 3 or Fig. 4) of standard and are connected, this connection comprises two sections 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 first invitation message to keep conversation with the IMS signaling to UE-B, media resource information in this invitation message carries the sign that indication keeps conversation, this invitation message is by way of S-CSCF, and S-CSCF is transmitted to AS according to service trigger criteria with 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 conversation.

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

Transfer Message may be REFER (transfer) message in practical operation.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, also can be incomplete session identification.

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

And, carrying the replacement session identification in this Transfer Message, this replacement session identification also 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.

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

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

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

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

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

Step 907, UE-C receive second invitation message, send response message, as send " 200OK " message of IMS, this response message belongs to the final response message of first invitation message, carry the media resource information of UE-B in this response message, because the media resource information in 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;

After step 908, AS receive this response message, 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, send to ICS UE-A as the response message of first invitation message.

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

Step 910, ICS UE-A initiate the 3rd invitation message to activate conversation with the 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, value as " a=" row in can media resource information is set to " sendrecv ", the 3rd invitation message is by way of S-CSCF, S-CSCF transmits this message and gives AS according to service trigger criteria.

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

And, carry the replacement session identification in this Transfer Message, 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 with the 3rd invitation message that receives target (the To territory of invitation message)--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 the special identifier of AS with diverting the aim, this special identifier and invitation message target--UE-B is associated.

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

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

MSCe or MGCF can be associated with ICS UE-A according to the target of this Transfer Message or the session identification of Transfer Message, and owing to carry the 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 that carries in the Transfer Message that receives, and MSCe or MGCF are with the source of ICS UE-A as the 4th invitation message, with diverting the aim in the Transfer Message is the target of the 4th invitation message, carries 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 (the To territory of invitation message) of the 4th invitation message, transmit the 4th invitation message to UE-B then, in order to activate conversation, AS is revised as state of activation with 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 sending " 200OK " message of IMS, this message belongs to the final response message of the 4th invitation message, carry the media resource information of UE-B in this response message, this response message arrives AS by way of S-CSCF.

After step 916, AS receive this response message, response message is transmitted to MSCe or MGCF.

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

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

Embodiment two

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

Step 1001, ICS UE-A set up with the conversation of UE-B according to the IMS centralized traffic process of standard and are connected, this connection comprises two sections 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 place hold mode with the conversation of UE-B, and therefore, the IMS media link does not have media data to transmit;

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

Step 1003, AS determine that the calling subscriber of this calling is ICS UE, and this ICS UE existed conversation to connect, and send 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, and this moment, the target (the To territory of message or Request-URI territory) of message can be ICS UE-A, also can be MSCe or MGCF; The session identification of this Transfer Message also can be incomplete session identification, and this moment, the target of message was ICS UE-A.

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

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

Step 1005, MSCe or MGCF send second invitation message.

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

Second invitation message is by way of S-CSCF, and S-CSCF is transmitted to AS according to the service trigger criteria that configures with this second invitation message.

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

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

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

This response message belongs to the final response message of 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 send to the response message of ICS UE-A as first invitation message after the media resource information in this response message is revised by standard procedure again.

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

Embodiment three

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

Step 1101, UE-B set up with the conversation of ICSUE-A according to the IMS centralized traffic process of standard and are connected, this connection comprises two sections 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 place hold mode with the conversation of ICS UE-A, so the IMS media link do not have media data to transmit, and the session identification between UE-B and the ICS UE-A is D1.

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

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

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

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

Step 1107, ICS UE-A send first invitation message, and the target of this invitation message (To territory) is divert the aim (the Refer-To territory) of Transfer Message, and, carrying in this invitation message 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 conversation 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, and this moment, the target (the To territory of message or Request-URI territory) of message can be ICS UE-A, also can be MSCe or MGCF; This Transfer Message also can be incomplete session identification, and this moment, the target of message was ICS UE-A.And, AS can also be made as diverting the aim in the 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 the special identifier of pointing to AS with diverting the aim, this special identifier and invitation message target--UE-C is associated.

Step 1109, MSCe or MGCF receive Transfer Message, and the message that sends the agreement transfer is to AS.

Step 1110, MSCe or MGCF send second invitation message.

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

Second invitation message is by way of S-CSCF, and S-CSCF is transmitted to AS according to the service trigger criteria that configures with second invitation message.

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

Step 1112, UE-C receive second invitation message, send response message, and this response message belongs to the final response message of 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 first invitation message after the media resource information in this response message is revised by standard procedure;

The replacement session identification D2 of second invitation message that step 1115, UE-C basis are received sends the message that stops session to UE-B, stops the D2 session, and as sending BYE (termination) message with the 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 sending " 200OK " message.

So far, set up conversation between ICS UE-A and UE-C and has been connected, conversation connects and comprises two sections 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 that object UE sends, notice CS-IMS conversion equipment sends invitation message to object UE, rather than acts on behalf of the CS-IMS conversion equipment send invitation message to object UE as currently used technology, thereby can set up being connected between ICS UE and the object UE under the situation that need not heavily to consult, therefore, save the time that conversation connects, improved the efficient that conversation connects, improved user experience.

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

Claims

1. call connection 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 it is characterized in that described method comprises:

Described AS receives 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 to send second invitation message to described object UE;

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

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

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

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

Described AS diverts the aim according to the described Transfer Message of Target Setting of first invitation message.

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

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

Described AS sends described second invitation message according to being provided with.

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

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

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

5. according to each described method in the claim 1 to 4, it is characterized in that, diverting the aim of described transfer request is the target of described first invitation message, or points to the special identifier of described AS, and this special identifier is associated with the target of described 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:

First receiver module is used to receive first invitation message that ICS UE sends to object UE;

Sending module, be used for after described first receiver module receives described first invitation message, send Transfer Message to the CS-IMS conversion equipment, wherein, described Transfer Message is used to indicate described CS-IMS conversion equipment to send second invitation message to diverting the aim of described Transfer Message;

Second receiver module is used to receive described CS-IMS conversion equipment to described second invitation message that diverts the aim and send;

First forwarding module is used for described second invitation message that described second receiver module receives is sent to described object UE;

The 3rd receiver module is used to receive the response message of described second invitation message that described object UE sends;

Second forwarding module is used for sending the response message of described first invitation message to described ICS UE after described the 3rd receiver module receives described response message.

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

Submodule is set, the session identification that is used for described Transfer Message is set to the session identification set up between this AS and the 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, be used for the described Transfer Message that the submodule setting is set is sent to described CS-IMS conversion equipment.

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

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

Transmit submodule, be used for sign, described second invitation message is transmitted to described object UE according to described object UE.

10. a CS-IMS conversion equipment is characterized in that, comprising:

Receiver module is used to receive the Transfer Message that AS sends;

Sending module is used for the described Transfer Message that receives according to described receiver module, to the transmission invitation message that diverts the aim of described Transfer Message.

11. CS-IMS conversion equipment according to claim 10 is characterized in that, described sending module comprises:

Submodule is set, is used for session identification, the source of described invitation message is set, and the target of described invitation message is set according to diverting the aim of described Transfer Message according to described Transfer Message;

Send submodule, be used to send the described described invitation message that submodule is provided with that is provided with.

12. a conversation connected system is characterized in that, comprising: ICS UE, AS, CS-IMS conversion equipment and object UE, wherein,

Described ICS UE is used for sending first invitation message to described object UE;

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

Described CS-IMS conversion equipment is used for behind the Transfer Message that receives from described AS, sends second invitation message according to diverting the aim of described Transfer Message to described object UE;

Described object UE is used for returning response message receiving after described second invitation message that described AS transmits to described ICS UE.