CN101577942A - Method for establishing both IMS media links and CS media links - Google Patents
Method for establishing both IMS media links and CS media links Download PDFInfo
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Abstract
The invention provides a method for establishing both IMS media links and CS media links. The method comprises the following steps that: after an IMS centralized service AS receives an invitation request C1 of a calling party which carries media resource information M1 for establishing IMS media links and information needing to establish CS media links, a specific number corresponding to the invitation request C1 is sent to the calling party through a response message of which the session identification is D1; after the calling party receives the response message carrying the specific number, a call aiming at the specific number is initiated in a CS network; after the AS receives an invitation request C2 which aims at the specific number and carries media resource information M2, an SDP request carrying the media resource information including the content of the M1 and the M2 is sent to a called party; and after the AS receives an SDP response sent by the called party, the As not only sends the SDP response to the calling party through the response message of which the session identification is D2, but also sends the SDP response to a CS domain.
Description
Technical field
The present invention relates to the media consulation method of the IP multimedia link of the communications field, relate more specifically to a kind of method of not only having set up the IMS media links but also having set up the CS media links.
Background technology
IP (Internet Protocol, network interconnection agreement) IP multimedia subsystem, IMS (IP Multimedia CoreNetwork Subsystem, be called for short IMS) be by third generation partner program (3rd GenerationPartnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, made up one opening and service environment flexibly, it supports multimedia application, can provide abundant multimedia service for the user.
In the IMS business system, key-course separates with operation layer, and key-course does not provide concrete business, and functions such as necessary triggering, route, charging only are provided to operation layer.Professional triggering and controlled function are CSCF (Call Session Control Function in the key-course, be called for short CSCF) finish, CSCF is divided into and acts on behalf of Proxy, inquiry Interrogating and three types of Serving of service, that wherein take the main responsibility is Serving, and the Interrogating type is optional.Operation layer is to be made up of a series of application servers (Application Server is called for short AS), and concrete business service can be provided, and AS can be an independent entity, also may reside among the S-CSCF.Key-course (S-CSCF) calls the business on the AS according to user's professional triggering of CAMEL-Subscription-Information control, realizes business function.AS and S-CSCF can be referred to as service equipment (SE, Server Equipment).End-to-end equipment in the session is called subscriber equipment (User Equipment, be called for short UE), is responsible for mutual with the user.Tradition UE is support circuit-switched (CS, a Circuit Switch) procotol, and these CS terminals all are by IMS network gateway and IMS network interaction.Because upgrading to fully, UE support the IMS procotol to need a process, some UE may support the limited in one's ability of IMS agreement, can only support the signaling protocol of IMS, can not support the IMS media protocol, if UE is the agreement of support circuit-switched (CS) network also, then media channel can provide by the CS network, and we are referred to as the UE (IMS Centralized Service UE is called for short ICS UE) of IMS centralized traffic this UE.The mutual transfer gateway of IMS network and CS network by the IMS network, or in the IMS centralized traffic (the enhanced Moblie Switch Center of enhancing mobile switching centre by the CS network, be called for short eMSC) realize, also can be that both cooperate and realize.The part of being responsible for the signaling conversion in the transfer gateway of IMS network is called MGCF (Media Gateway Control Function is called for short MGCF), and the part of being responsible for media conversion is called media gateway (Media GateWay is called for short MGW).The transfer gateway of eMSC and IMS network cooperates the media gateway in the transfer gateway that is meant eMSC and IMS network to cooperate, and the eMSC of this moment just is similar to MGCF.
Because the final purpose of session is to realize that medium connect, therefore need in session, consult media resource information, the agreement of consulting media resource information in the IMS system is SDP (Session DescriptionProtocol, Session Description Protocol), the alternant way of agreement is request response pattern, i.e. SDP request must have a SDP to respond, SDP request and the content of responding all are media resource information, media resource information comprises medium owner information (comprising address information), the medium link address, medium type and the media port relevant and codec information etc. with medium type, in the content that SDP responds, medium quantity, medium quantity during type and order must be asked with SDP, type and order are identical.The content of SDP agreement is by SIP (Session Initiation Protocol, conversation initialized protocol) message body of message is carried, reciprocal process is independent of the request of SIP and responds pattern, that is to say the request of SIP or receive the response in can carry SDP request, also can carry SDP and respond, also can not carry the SDP protocol contents.
The IMS centralized traffic is for legacy user terminals or not only support the IMS procotol but also support the terminal of CS procotol that unified IMS business platform is provided, and makes user's miscellaneous service logic and user profile all provide and record by the IMS network uniformly.When the signal of IMS network covers bad, in the time of can only providing the IMS signaling protocol to support, the IMS centralized traffic allows terminal to set up media links by assisting in the CS network of IMS signaling protocol, when the signal covering of IMS network can only provide setting up of part of media link, the IMS centralized traffic allows terminal assisting by the IMS signaling protocol, set up media links respectively at IMS network and CS network, thereby realize enriching the multi-media communication service of high-quality.
Fig. 1 is the network architecture diagram of IMS centralized traffic, has described the signaling interface of IMS centralized traffic terminal ICS UE-A and IMS terminal UE-B and IMS network, and ICS UE-A and UE-B conversation have comprised CS medium and IMS medium, and it is described below:
ICS UE-A is mutual by IMS signaling interface and S-CSCF, and by the IMS signaling interface between S-CSCF and the centralized traffic AS, and is indirect and centralized traffic AS is mutual, and centralized traffic AS is responsible for handling the interrelated logic of centralized traffic; It is mutual that ICS UE-A passes through CS signaling interface and MGCF or eMSC, MGCF translates into the IMS signaling with the CS signaling, mutual by IMS signaling interface and S-CSCF, and the IMS signaling interface by S-CSCF and centralized traffic AS, indirectly and centralized traffic AS mutual, finally realize another road interaction path of ICS UE-A and centralized traffic AS by the signaling interface of S-CSCF and centralized traffic AS, at last, centralized traffic AS merges into a line signaling with two line signalings, this signaling is transmitted to S-CSCF by the IMS signaling interface with it, by the IMS signaling interface it is transmitted to UE-B by S-CSCF again.
Hereinafter,, AS and S-CSCF are expressed as an entity, use the IMS signaling process of standard mutual therebetween for the convenience of drawing and flow process is described; And the transfer gateway of eMSC and IMS network is expressed as an entity, because both functions are quite similar, just eMSC belongs to the CS network equipment, and MGCF and MGW (MGCF/MGW) belong to the IMS network equipment.
Fig. 2 is that existing IMS centralized business realizing ICS UE-A had not only set up the IMS media links but also set up the flow chart of CS media links, description be that ICS UE-A calls out UE-B, and require both to have set up the IMS media links, set up the CS media links again, its step is as follows:
Step 201, ICS UE-A use the IMS signaling to call out UE-B, such as sending INVITE (invitation) message, carry the SDP request, wherein comprise the media resource information of ICS UE-A and the indication that need set up the CS media links, such as in message body, carrying the SDP request, this SDP had both contained the media resource information that is used to set up the IMS media links of ICS UE-A, contained the information which kind of CS media links (audio or video etc.) ICS UE-A wishes to set up again;
Step 202, IMS signaling message related to calls arrive centralized traffic AS, AS knows also needs CS media links according to the information among the SDP, so for this user distributes a particular number (this particular number is dynamic number), the calling of using this number to carry out all can arrive centralized traffic AS, and the calling of this particular number and step 201 is associated;
Step 203, centralized traffic AS are with part deletion relevant with the CS medium in the SDP request, and forwarded call message is then given UE-B;
Step 204, UE-B receive message related to calls, send Temporary Response message, and such as sending " 183 SessionProgress " message, the media resource information of carrying UE-B in the message body is carried such as responding by the SDP in the message body;
Step 205, Temporary Response message arrive centralized traffic AS, and AS adds the number of distributing in the SDP response of Temporary Response message to, is transmitted to ICS UE-A then;
Step 206, ICS UE-A, centralized traffic AS and UE-B continue to finish the resource negotiation and the call answering processing of IMS media link according to the process of standard;
After step 206 was finished, ICS UE-A had just set up the media links S1 of an IMS with UE-B;
Step 207, when receiving the message of step 205, ICS UE-A can make a call to the number that distributes at the CS network simultaneously;
Step 208, CS message related to calls arrive eMSC or MGCF, eMSC or MGCF translate into this message related to calls the message related to calls of IMS signaling, thereby set up new session, such as sending INVITE, and obtain to be used to set up the media resource information of MGW and called 's IMS media links from MGW, the message related to calls that sends the IMS signaling then is to the destination---the number that centralized traffic AS distributes, and message related to calls carries the media resource information of MGW, such as carrying with the request of the SDP in the message body;
Step 209, centralized traffic AS receive new calling, and the destination of finding this calling is the number that distributes before it, so the session association of the call setup of the new session of this call setup and step 201 is got up;
Step 210, centralized traffic AS to the heavy invitation message that ICS UE-A sends the IMS signaling, such as sending reINVITE (heavily inviting) message, are not with any SDP information in the message body behind completing steps 206;
Step 211, ICS UE-A receive this heavy invitation message, the heavy invitation message of echo reply, and such as transmission " 200OK " message, and the media resource information of carrying ICS UE-A, such as in message body, carrying with SDP information;
Step 212, centralized traffic AS after receiving and replying heavy invitation message merge media resource information in the message and the media resource information in the step 208;
Step 213, centralized traffic AS send heavy invitation message to UE-B, such as sending reINVITE message, and carry the media resource information after the merging, such as carrying with the SDP request in message body;
Step 214, UE-B receive heavy invitation message, and the heavy invitation message of echo reply such as sending " 200OK " message, and is carried media resource information after the renewal of UE-B, carry such as responding with SDP in message body;
Step 215, centralized traffic AS split into two parts with the media resource information of wherein carrying after receiving and replying heavy invitation message, and portion sends to ICS UE-A, and another part sends to eMSC or MGCF;
Step 216, centralized traffic AS reply heavy invitation message to the affirmation that ICS UE-A sends the IMS signaling, such as sending ACK (affirmation) message, carry the media resource information of issuing ICS UE-A of coming out that splits, such as carrying with the SDP response in message body;
Step 217, centralized traffic AS to the response message of eMSC or MGCF transmission IMS signaling, such as sending " 200OK " message, carry the media resource information of issuing eMSC or MGCF of coming out that splits, such as carrying with the SDP response simultaneously in message body;
Step 218, eMSC or MGCF send to ICS UE-A with the response message that the response message of IMS signaling is translated as the CS signaling;
Since then, set up another media path between ICS UE-A and UE-B, comprising ICS
UE-A is to CS media links S2 between MGW and the IMS media links S3 between MGW and UE-B.
As seen from Figure 2, the existing method of not only having set up the IMS media links but also having set up the CS media links, what adopt is to set up the IMS media links earlier, add the method for CS media links after the user answer again, the deficiency of this method is: experience a kind of conversation of media mode after the user answer earlier, another kind of medium are just arranged then, and the intention that will carry out two kinds of medium conversations with the calling subscriber simultaneously is inconsistent, causes user's experience not good.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of not only having set up the IMS media links but also having set up the CS media links, is used for the IMS centralized traffic, can reduce the step of Signalling exchange and the time that needs effectively, and improve user experience.
In order to address the above problem, the invention provides a kind of method of not only having set up the IMS media links but also having set up the CS media links, be applied to IP Multimedia System IMS network, described method comprises:
After IMS centralized traffic application server AS receives that carrying of calling subscriber equipment is used to set up the media resource information M1 of IMS media links and need sets up the invitation request C1 of information of CS media links, be that the response message of D1 sends to described calling subscriber equipment by session identification with a particular number corresponding with described invitation request C1;
After described calling subscriber equipment was received the response message that carries particular number, initiating with described particular number at the CS network was the calling of target;
After described AS receives and is invitation request C2 target, that carry media resource information M2 with described particular number, send the Session Description Protocol SDP request of carrying the media resource information that comprises the content among described M1 and the described M2 to called subscriber equipment;
After described AS receives that SDP that described called subscriber equipment sends responds, be that the response message of D2 sends a SDP to calling subscriber equipment and responds both, and also sent a SDP and respond to the CS territory by session identification.
Further, what described calling subscriber equipment was initiated at the CS network is that the calling of target is translated into the described invitation request C2 in IMS territory by the media gateway in CS territory and IMS territory, the media resource information that the described media resource information M2 that wherein carries is described media gateway with described particular number;
Media resource information during the SDP that described AS sends described called subscriber equipment responds is split as two parts, and a part sends to described calling subscriber equipment, and another part sends to the CS territory, promptly sends to described media gateway.
Further, after described AS receives described invitation request C2, the session of described invitation request C2 foundation and the session association of described invitation request C1 foundation are got up,, ask thereby send described SDP to described called subscriber equipment to obtain the information of described called subscriber equipment.
Further, after described AS receives described invitation request C1, will be transmitted to described called subscriber equipment after the part deletion relevant among the described invitation request C1 with the CS medium; And after receiving the response message that described called subscriber equipment returns, described particular number is included in the response message of described invitation request C1 that session identification is D1 sends to described calling subscriber equipment.
Further, after described AS receives described invitation request C1, the session identification that structure comprises imaginary media resource information is the response message of the described invitation request C1 of D1, and described particular number is included in the response message of described structure and sends to described calling subscriber equipment.
Further, the described session identification of described AS be the content of To-Tag part of response message of the described invitation request C1 of D2 be set to described session identification be that the content of To-Tag part of response message of described invitation request C1 of D1 is inequality.
Further, described SDP request package is contained in UPDATE or PRACK updating message, or in the message body of INVITE invite request message.
Further, described particular number is that described AS is the dynamic number that described invitation request C1 distributes, and described particular number can be routed to described AS by network; By described particular number, the related described invitation request C1 of described AS.
The present invention also provides a kind of method of not only having set up the IMS media links but also having set up the CS media links, is applied to the IMS network, and described method comprises:
After IMS centralized traffic AS receives that carrying of calling subscriber equipment is used to set up the media resource information of IMS media links and need sets up the invitation request c1 of information of CS media links, the response message of a particular number by described invitation request c1 sent to described calling subscriber equipment;
After described calling subscriber equipment was received the response message that carries particular number, both initiating with described particular number at the IMS network was invitation request target, that carry media resource information; Also initiating with described particular number at the CS network is the calling of target;
Described AS receives with described particular number to be the invitation request c2 of the media resource information of the carrying m1 of target, after with described particular number being the invitation request c3 of the media resource information of carrying m2 of target, send the SDP request of carrying the media resource information that comprises the content among described m1 and the described m2 to called subscriber equipment by invite request message;
Described AS both sends a SDP to described calling subscriber equipment and responds after receiving that the SDP of described called subscriber equipment transmission responds, and also sends a SDP response to the CS territory.
Further, after described AS received described invitation request c1, structure comprised the response message of described invitation request c1 of imaginary media resource information, and described particular number was included in the response message of described structure and sends to described calling subscriber equipment.
Further, what described calling subscriber equipment was initiated at the CS network is that the calling of target is translated into the described invitation request c2 in IMS territory by the media gateway in CS territory and IMS territory, the media resource information that the described media resource information m1 that wherein carries is described media gateway with described particular number;
Media resource information during the SDP that described AS sends described called subscriber equipment responds is split as two parts, and a part sends to described calling subscriber equipment, and another part sends to the CS territory, promptly sends to described media gateway.
Further, after described AS receives described invitation request c2 and c3, the session that session that described invitation request c2 is set up and described invitation request c3 set up is got up with the session association of described invitation request c1 foundation, obtaining the information of described called subscriber equipment, thereby send described invite request message to described called subscriber equipment.
Further, described media resource information is responded by request of the SDP in the message body of described invite request message and described response message or SDP and is carried.
Further, described particular number is that described AS is the dynamic number that described invitation request c1 distributes, and described particular number can be routed to described AS by network, by described particular number, and the related described invitation request C1 of described AS.
Description of drawings
Fig. 1 is the network architecture diagram of IMS centralized traffic;
Fig. 2 is that existing IMS centralized business realizing ICS UE-A had not only set up the IMS media links but also set up the flow chart of CS media links;
Fig. 3 is that the IMS centralized traffic of the embodiment of the invention one realizes that ICS UE-A had not only set up the IMS media links but also set up the flow chart of CS media links;
Fig. 4 is that the IMS centralized traffic of the embodiment of the invention two realizes that ICS UE-A had not only set up the IMS media links but also set up the flow chart of CS media links;
Fig. 5 is that the IMS centralized traffic of the embodiment of the invention three realizes that ICS UE-A had not only set up the IMS media links but also set up the flow chart of CS media links.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Below for the convenience of drawing and flow process is described, centralized traffic AS and S-CSCF are expressed as an entity, use the IMS signaling process of standard mutual therebetween.MGCF and MGW represent that with an entity with gateway and gateway control function the media resource information of this entity is the media resource information of gateway part.MGCF and MGW belong to the IMS network equipment, and the entity of CS network correspondence is eMSC (being responsible for handling IMS signaling and media data simultaneously), and perhaps this entity comprises eMSC (only being responsible for handling the IMS signaling) and MGW.
Embodiment one
Figure 3 shows that one embodiment of the present of invention, described ICS UE-A and called out UE-B, and require both to have set up the IMS media links, set up the CS media links again, when ICS UE-A set up CS territory new session, by initiatively new IMS territory session of ICS UE-A, its key step was as follows:
Step 301, ICS UE-A use the IMS signaling to call out UE-B, such as sending INVITE (invitation) message, carry the SDP request, wherein comprise the media resource information of ICS UE-A and the indication that need set up the CS media links, such as in message body, carrying the SDP request, this SDP had both contained the media resource information that is used to set up the IMS media links of ICS UE-A, contained the information which kind of CS media links (audio or video etc.) ICS UE-A wishes to set up again;
Step 302, IMS signaling message related to calls arrive centralized traffic AS, AS knows also needs CS media links according to the information among the SDP, so for this user distributes a particular number P, the calling of using this particular number to carry out all can arrive centralized traffic AS, and the calling of this particular number and step 301 is associated;
Described particular number P can be the dynamic number that distributes, and this particular number P can be routed to centralized traffic AS by network (IMS network or CS network); By described particular number, the calling of centralized traffic AS associated steps 301.
Step 303, SDP of centralized traffic AS structure responds, wherein comprise an imaginary media resource information, such as the media resource information of revising UE-A, become 0 comprising port numbers with corresponding medium type, also comprise the particular number P that centralized traffic AS distributes, centralized traffic AS sends the Temporary Response message of IMS signaling to ICS UE-A then, such as sending " 183 Session Progress " message, the SDP that carries structure responds, such as in message body, carrying, centralized traffic AS knows that ICSUE-A should set up the IMS media links and set up the CS media links again, so wait for two new call requests, the destination of two new call requests all is the particular number P of its distribution;
Step 304, ICS UE-A initiate new calling to set up new session at the IMS network to the number that distributes, such as sending INVITE, carry the media resource information m1 that is used to set up the IMS media links of ICS UE-A, such as in message body, carrying with the SDP request;
Step 305, with step 304 simultaneously, ICS UE-A makes a call to the particular number P that distributes at the CS network;
The CS message related to calls of step 306, step 305 arrives eMSC or MGCF, eMSC or MGCF translate into this message related to calls the message related to calls of IMS signaling, thereby set up another new session, such as sending INVITE, and obtain to be used to set up the media resource information of MGW and called 's IMS media links from MGW, the message related to calls that sends the IMS signaling then is to the destination---the particular number P that centralized traffic AS distributes, message related to calls carries the media resource information m2 of MGW, such as carrying with the SDP request in message body;
After step 307, centralized traffic AS receive the new calling of step 304 and step 306, the session association of the call setup of two new sessions of these two call setups and step 301 is got up, obtain real call targets UE-B, merging the media resource information of carrying in these two new sessions simultaneously is m3;
Step 308, centralized traffic AS send the message related to calls of IMS signaling to UE-B, such as sending INVITE, and carry the media resource information m3 after the merging, such as carrying with the SDP request in message body;
Step 309, UE-B receive message related to calls, and the echo reply message related to calls such as sending " 200OK " message, and is carried the media resource information m4 of UE-B, carry such as responding with SDP in message body;
After step 310, centralized traffic AS receive response message, the media resource information m4 that wherein carries is split into two parts of m5 and m6, a copy of it sends to ICS UE-A, and another part sends to eMSC or MGCF;
Step 311, centralized traffic AS send the response message of IMS signaling to ICS UE-A, calling with response steps 304, such as sending " 200OK " message, carry and split the media resource information m6 that issues ICS UE-A of coming out, such as in message body, carrying with the SDP response;
Step 312, centralized traffic AS to the response message of eMSC or MGCF transmission IMS signaling, such as sending " 200OK " message, carry and split the media resource information m5 that issues eMSC or MGCF of coming out, such as carrying with the SDP response in message body simultaneously;
Step 313, eMSC or MGCF send to ICS UE-A with the response message that the response message of IMS signaling is translated as the CS signaling;
Step 314, send the message of step 311 and step 312 after, centralized traffic AS sends the response message of IMS signaling again to ICSUE-A, with the calling of response steps 301, such as sending " 200OK " message;
Since then, two media paths have been set up between ICS UE-A and UE-B simultaneously, one is direct-connected IMS media links S1 between ICSUE-A and UE-B, another be ICS UE-A with UE-B between indirect the connection, comprising ICS UE-A to CS media links S2 between MGW and the IMS media links S3 between MGW and UE-B.
Among this embodiment, AS does not issue called UE-B with the media resource information of ICS UE-A immediately, but earlier the particular number that distributes is issued ICS UE-A, wait for that then two particular number P with distribution are the new session of target: a CS territory new session and an IMS territory new session, and then will mail to called UE-B after the merging of the media resource information in two new sessions, and the media resource information fractionation back that will calledly return sends by these two new sessions.
Embodiment two
Figure 4 shows that another embodiment of the present invention, described ICS UE-A and called out UE-B, and required not only to set up the IMS media links but also set up the CS media links, when ICS UE-A sets up CS territory new session, initiatively set up a new IMS territory session by centralized traffic AS, its key step is as follows:
Step 401, ICS UE-A use the IMS signaling to call out UE-B, such as sending INVITE (invitation) message, carry the SDP request, wherein comprise the media resource information of ICS UE-A and the indication that need set up the CS media links, such as in message body, carrying the SDP request, this SDP had both contained the media resource information M1 that is used to set up the IMS media links of ICS UE-A, contained the information which kind of CS media links (audio or video etc.) ICS UE-A wishes to set up again;
Step 402, IMS signaling message related to calls arrive centralized traffic AS, AS knows also needs CS media links according to the information among the SDP, so for this user distributes a particular number P, this particular number P can be the dynamic number that distributes, the calling of using this particular number P to carry out all can arrive centralized traffic AS, and centralized traffic AS associates the calling of this particular number P and step 401;
Step 403, SDP of centralized traffic AS structure respond, wherein comprise an imaginary media resource information, such as the media resource information of revising UE-A, become 0 comprising port numbers with corresponding medium type, also comprise the particular number P that centralized traffic AS distributes, centralized traffic AS sends the Temporary Response message of IMS signaling to ICS UE-A then, such as sending " 183 Session Progress " message, the SDP that carries structure responds, such as carrying in message body, centralized traffic AS knows ICS
UE-A should set up the IMS media links and set up the CS media links again, so wait for two new call requests, the destination of two new call requests all is the particular number P of its distribution;
Step 404, ICS UE-A initiate new the calling at the CS network to the number that distributes;
The CS message related to calls of step 405, step 404 arrives eMSC or MGCF, eMSC or MGCF translate into this message related to calls the message related to calls of IMS signaling, thereby set up new session, such as sending INVITE, and obtain to be used to set up the media resource information of MGW and called 's IMS media links from MGW, the message related to calls that sends the IMS signaling then is to the destination---the particular number P that centralized traffic AS distributes, message related to calls carries the media resource information M2 of MGW, such as carrying with the request of the SDP in the message body;
After step 406, centralized traffic AS receive the new calling of step 405, the session association of the call setup of the new session of this call setup and step 301 is got up, obtain real call targets UE-B, merge media resource information M1 that being used for of carrying in these two sessions set up the IMS media links and M2 simultaneously and be M3 (step 401 session of setting up carry the part relevant be not included in interior) with the CS medium;
Step 407, centralized traffic AS send the message related to calls of IMS signaling to UE-B, such as sending INVITE, and carry the media resource information M3 after the merging, such as carrying with the SDP request in message body;
Step 408, UE-B receive message related to calls, and the echo reply message related to calls such as sending " 200OK " message, and is carried the media resource information M4 of UE-B, carry such as responding with SDP in message body;
After step 409, centralized traffic AS receive response message, the media resource information M4 that wherein carries is split into two parts, portion is the M6 that sends to ICS UE-A, and another part is the M5 that sends to eMSC or MGCF;
Step 410, centralized traffic AS, carry and split the media resource information M5 that issues eMSC or MGCF of coming out, such as carrying with the SDP response in message body such as sending " 200OK " message to the response message that eMSC or MGCF send the IMS signaling;
Step 411, eMSC or MGCF send to ICS UE-A with the response message that the response message of IMS signaling is translated as the CS signaling;
After step 412, the step 410, centralized traffic AS sends the response message of IMS signaling to ICS UE-A in the mode of newly-built session, such as sending " 200OK " message, it is inequality (like this to adopt the To-Tag partial content of branch (Fork) technology message to be set to the content of the To-Tag part of the message of step 403, for ICS UE-A, step 403 and step 412 are two sessions), carry the media resource information M6 that issues ICS UE-A that splits in the response message, be included in during SDP in the message body responds such as this information;
Since then, set up two media paths between ICS UE-A and UE-B simultaneously, one is ICS
Direct-connected IMS media links S1 between UE-A and UE-B, another be ICS UE-A with UE-B between indirect the connection, comprising ICS UE-A to CS media links S2 between MGW and the IMS media links S3 between MGW and UE-B.
This flow chart also can change according to standard mode, such as step 408 can be the Temporary Response message of IMS signaling, thereby 410 and 412 also is Temporary Response message, step 411 is handled according to standard mode by eMSC or MGCF, if 410 have corresponding C S network signal correspondence, then issue ICSUE-A after the translation.
Among this embodiment, AS does not issue called UE-B with the media resource information of ICS UE-A immediately, but earlier the particular number P that distributes is issued ICS UE-A, wait for that then the particular number P to distribute is the CS territory new session of target, and then will mail to called UE-B after the merging of the media resource information in CS territory new session and the former IMS session, and with after the called media resource information fractionation of returning, in the mode of a newly-built session again, the media resource information after splitting is sent by two new sessions (step 410 and step 412).
Embodiment three
Figure 5 shows that another embodiment of the present invention, described ICS UE-A and called out UE-B, and required not only to set up the IMS media links but also set up the CS media links, when ICS UE-A sets up CS territory new session, initiatively set up a new IMS territory session by centralized traffic AS, its key step is as follows:
Step 501, ICS UE-A use the IMS signaling to call out UE-B, such as sending INVITE (invitation) message, carry the SDP request, wherein comprise the media resource information of ICS UE-A and the indication that need set up the CS media links, such as in message body, carrying the SDP request, this SDP had both contained the media resource information M1 that is used to set up the IMS media links of ICS UE-A, contained the information which kind of CS media links (audio or video etc.) ICS UE-A wishes to set up again;
Step 502, IMS signaling message related to calls arrive centralized traffic AS, AS knows also needs CS media links according to the information among the SDP, so for this user distributes a particular number P, the calling of using this particular number P to carry out all can arrive centralized traffic AS, and the calling of this particular number P and step 501 is associated;
Step 503, centralized traffic AS are with part deletion relevant with the CS medium in the SDP request, and forwarded call message is then given UE-B;
Step 504, UE-B receive message related to calls, send Temporary Response message, and such as sending " 183 SessionProgress " message, the media resource information of carrying UE-B in the message body is carried such as responding by the SDP in the message body;
Step 505, Temporary Response message arrive centralized traffic AS, and AS adds the particular number P that distributes in the SDP response of Temporary Response message to, is transmitted to ICS UE-A then;
Step 506, ICS UE-A initiate new the calling at the CS network to the particular number P that distributes;
What this step was different with step 205 is that after centralized traffic AS was transmitted to ICS UE-A with the particular number P of distributing, ICS UE-A, centralized traffic AS and UE-B do not carry out the resource negotiation and the call answering of IMS media link to be handled; But centralized traffic AS continues to wait for that the particular number P to distribute is the CS territory new session of target.
The CS message related to calls of step 507, step 506 arrives eMSC or MGCF, eMSC or MGCF translate into this message related to calls the message related to calls of IMS signaling, thereby set up new session, such as sending INVITE, and obtain to be used to set up the media resource information of MGW and called 's IMS media links from MGW, the message related to calls that sends the IMS signaling then is to the destination---the particular number P that centralized traffic AS distributes, message related to calls carries the media resource information M2 of MGW, such as carrying with the request of the SDP in the message body;
After step 508, centralized traffic AS receive the new calling of step 507, the session association of the call setup of the new session of this call setup and step 501 is got up, obtain real call targets UE-B, merge media resource information M1 that being used for of carrying in these two sessions set up the IMS media links and M2 simultaneously and merge into M3 (step 501 session of setting up carry the part relevant be not included in interior) with the CS medium;
Step 509, centralized traffic AS send the updating message of IMS signaling to UE-B, such as sending UPDATE (renewals) message or PRACK (pre-confirm) message, and carry the media resource information M3 after the merging, such as asking to carry with SDP in message body;
Step 510, UE-B receive updating message, return the agreement updating message, such as sending " 200OK " message, and carry the media resource information M4 of the UE-B after the renewal, carry such as responding with SDP in message body;
Step 511, centralized traffic AS split into two parts with the media resource information M4 that wherein carries after receiving and agreeing updating message, and portion is the M5 that sends to ICS UE-A, and another part is the M6 that sends to eMSC or MGCF;
Step 512, centralized traffic AS send the Temporary Response message of IMS signaling to ICS UE-A with new conversational mode, such as sending " 183Session Progress " message, it is inequality to adopt the To-Tag partial content of branch (Fork) technology message to be set to the content of the To-Tag part of the message of step 505, carry the media resource information M5 that issues ICS UE-A that splits in the Temporary Response message, be included in during SDP in the message body responds such as this information;
Step 513, centralized traffic AS send the Temporary Response message of IMS signaling to eMSC or MGCF, such as sending " 183 Session Progress " message, carry and split the media resource information M6 that issues eMSC or MGCF of coming out, such as in message body, carrying with the SDP response, eMSC or MGCF handle this Temporary Response message according to standard mode, if this message has corresponding C S network signal correspondence, then issue ICS UE-A after the translation, then do not send any CS network signal, this embodiment supposes that the message of step 513 does not have corresponding C S network signal;
Step 514, UE-B answering call send answer call message, such as sending " 200OK " message;
Step 515, centralized traffic AS receive response message, transmit this response message to eMSC or MGCF;
Step 516, eMSC or MGCF send to ICS UE-A with the response message that the response message of IMS signaling is translated as the CS signaling;
Step 517, centralized traffic AS are after step 515, and the new session of setting up by step 512 sends response message to ICS UE-A;
Since then, two media paths have been set up between ICS UE-A and UE-B simultaneously, one is direct-connected IMS media links S1 between ICSUE-A and UE-B, another be ICS UE-A with UE-B between indirect the connection, comprising ICS UE-A to CS media links S2 between MGW and the IMS media links S3 between MGW and UE-B.
Among this embodiment, AS issues called UE-B with the media resource information of ICS UE-A earlier, again the particular number P that distributes is issued ICS UE-A, and wait for that the particular number P to distribute is the CS territory new session of target, and then will mail to called UE-B after the merging of the media resource information in CS territory new session and the former IMS session, and after the called media resource information returned split,, the media resource information after splitting is sent by two new sessions respectively in the mode of a newly-built session again.
This embodiment is suitable for UE-B can carry media resource information as the mode of responding by Temporary Response, carries media resource information as the mode of responding (as the mode in the step 408 among Fig. 4) and be not suitable for UE-B by response message.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (14)
1, a kind of method of not only having set up the IMS media links but also having set up the CS media links is applied to IP Multimedia System IMS network, it is characterized in that described method comprises:
After IMS centralized traffic application server AS receives that carrying of calling subscriber equipment is used to set up the media resource information M1 of IMS media links and need sets up the invitation request C1 of information of CS media links, be that the response message of D1 sends to described calling subscriber equipment by session identification with a particular number corresponding with described invitation request C1;
After described calling subscriber equipment was received the response message that carries particular number, initiating with described particular number at the CS network was the calling of target;
After described AS receives and is invitation request C2 target, that carry media resource information M2 with described particular number, send the Session Description Protocol SDP request of carrying the media resource information that comprises the content among described M1 and the described M2 to called subscriber equipment;
After described AS receives that SDP that described called subscriber equipment sends responds, be that the response message of D2 sends a SDP to calling subscriber equipment and responds both, and also sent a SDP and respond to the CS territory by session identification.
2, the method for claim 1, it is characterized in that, what described calling subscriber equipment was initiated at the CS network is that the calling of target is translated into the described invitation request C2 in IMS territory by the media gateway in CS territory and IMS territory, the media resource information that the described media resource information M2 that wherein carries is described media gateway with described particular number;
Media resource information during the SDP that described AS sends described called subscriber equipment responds is split as two parts, and a part sends to described calling subscriber equipment, and another part sends to the CS territory, promptly sends to described media gateway.
3, the method for claim 1, it is characterized in that, after described AS receives described invitation request C2, the session of described invitation request C2 foundation and the session association of described invitation request C1 foundation are got up, to obtain the information of described called subscriber equipment, ask thereby send described SDP to described called subscriber equipment.
4, the method for claim 1 is characterized in that, after described AS receives described invitation request C1, will be transmitted to described called subscriber equipment after the part deletion relevant with the CS medium among the described invitation request C1; And after receiving the response message that described called subscriber equipment returns, described particular number is included in the response message of described invitation request C1 that session identification is D1 sends to described calling subscriber equipment.
5, the method for claim 1, it is characterized in that, after described AS receives described invitation request C1, the session identification that structure comprises imaginary media resource information is the response message of the described invitation request C1 of D1, and described particular number is included in the response message of described structure and sends to described calling subscriber equipment.
6, as claim 1 or 4 or 5 described methods, it is characterized in that, the described session identification of described AS be the content of To-Tag part of response message of the described invitation request C1 of D2 be set to described session identification be that the content of To-Tag part of response message of described invitation request C1 of D1 is inequality.
7, the method for claim 1 is characterized in that, described SDP request package is contained in UPDATE or PRACK updating message, or in the message body of INVITE invite request message.
As claim 1 or 3 described methods, it is characterized in that 8, described particular number is that described AS is the dynamic number that described invitation request C1 distributes, described particular number can be routed to described AS by network; By described particular number, the related described invitation request C1 of described AS.
9, a kind of method of not only having set up the IMS media links but also having set up the CS media links is applied to the IMS network, it is characterized in that described method comprises:
After IMS centralized traffic AS receives that carrying of calling subscriber equipment is used to set up the media resource information of IMS media links and need sets up the invitation request c1 of information of CS media links, the response message of a particular number by described invitation request c1 sent to described calling subscriber equipment;
After described calling subscriber equipment was received the response message that carries particular number, both initiating with described particular number at the IMS network was invitation request target, that carry media resource information; Also initiating with described particular number at the CS network is the calling of target;
Described AS receives with described particular number to be the invitation request c2 of the media resource information of the carrying m1 of target, after with described particular number being the invitation request c3 of the media resource information of carrying m2 of target, send the SDP request of carrying the media resource information that comprises the content among described m1 and the described m2 to called subscriber equipment by invite request message;
Described AS both sends a SDP to described calling subscriber equipment and responds after receiving that the SDP of described called subscriber equipment transmission responds, and also sends a SDP response to the CS territory.
10, method as claimed in claim 9, it is characterized in that, after described AS receives described invitation request c1, structure comprises the response message of described invitation request c1 of imaginary media resource information, and described particular number is included in the response message of described structure and sends to described calling subscriber equipment.
11, method as claimed in claim 9, it is characterized in that, what described calling subscriber equipment was initiated at the CS network is that the calling of target is translated into the described invitation request c2 in IMS territory by the media gateway in CS territory and IMS territory, the media resource information that the described media resource information m1 that wherein carries is described media gateway with described particular number;
Media resource information during the SDP that described AS sends described called subscriber equipment responds is split as two parts, and a part sends to described calling subscriber equipment, and another part sends to the CS territory, promptly sends to described media gateway.
12, method as claimed in claim 9, it is characterized in that, after described AS receives described invitation request c2 and c3, the session that session that described invitation request c2 is set up and described invitation request c3 set up is got up with the session association of described invitation request c1 foundation, obtaining the information of described called subscriber equipment, thereby send described invite request message to described called subscriber equipment.
13, method as claimed in claim 9 is characterized in that, described media resource information is responded by request of the SDP in the message body of described invite request message and described response message or SDP and carried.
14, as claim 9 or 12 described methods, it is characterized in that described particular number is that described AS is the dynamic number that described invitation request c1 distributes, described particular number can be routed to described AS by network, by described particular number, the related described invitation request C1 of described AS.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702310A (en) * | 2013-12-30 | 2014-04-02 | 成都道永网络技术有限公司 | Multi-interface data merge implementation method |
| US9049677B2 (en) | 2008-11-07 | 2015-06-02 | Huawei Technologies Co., Ltd. | Method, apparatus and system for paging processing and information displaying |
| WO2019011149A1 (en) * | 2017-07-12 | 2019-01-17 | 中兴通讯股份有限公司 | Communication method and device, application server, user equipment and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100352295C (en) * | 2005-01-24 | 2007-11-28 | 华为技术有限公司 | Method for realizing IP multi media sub-system conversation falling to circuit switching call |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9049677B2 (en) | 2008-11-07 | 2015-06-02 | Huawei Technologies Co., Ltd. | Method, apparatus and system for paging processing and information displaying |
| US10306517B2 (en) | 2008-11-07 | 2019-05-28 | Huawei Technologies Co., Ltd. | Method, apparatus and system for paging processing and information displaying |
| US10757614B2 (en) | 2008-11-07 | 2020-08-25 | Huawei Technologies Co., Ltd. | Method, apparatus and system for paging processing and information displaying |
| CN103702310A (en) * | 2013-12-30 | 2014-04-02 | 成都道永网络技术有限公司 | Multi-interface data merge implementation method |
| WO2019011149A1 (en) * | 2017-07-12 | 2019-01-17 | 中兴通讯股份有限公司 | Communication method and device, application server, user equipment and system |
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