CN101098283A

CN101098283A - Method for implementing multimedia call intercommunication in CS field and IMS field

Info

Publication number: CN101098283A
Application number: CNA2006100907137A
Authority: CN
Inventors: 王耕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-06-28
Filing date: 2006-06-28
Publication date: 2008-01-02
Anticipated expiration: 2026-06-28
Also published as: CN100563193C; WO2008003233A1

Abstract

The invention discloses a method for realizing multimedia call interaction between CS domain and IMS domain, for resolving the problem of prior WCDMA system which can not realize multimedia call interaction between CS domain and IMS domain. The method comprises that holding the load method of CS domain, converting the load on the IMS domain into the load method of CS domain, to realize intercommunication, and according to the transmission method of CS domain media flow control command, completing the intercommunication of media flow between CS domain and IMS domain. Via the invention, users under CS domain and IMS domain can process multimedia call, to improve device utilization of operator and support multimedia call under the two structures.

Description

The implementation method of multimedia call intercommunication is carried out in a kind of CS territory and IMS territory

Technical field

The present invention relates to the communications field, particularly relate to the implementation method that multimedia call intercommunication is carried out in a kind of CS territory and IMS territory.

Background technology

Walking circuit territory (CS DOMAIN) multimedia call service is an important service in the 3-G (Generation Three mobile communication system), is that 3G (Third Generation) Moblie is different from one of significant business of the second generation.This business makes the user when carrying out voice call, can also see the other side's image, is a business that important actual application value is arranged.

The WCDMA 3G (Third Generation) Moblie has defined a cover system framework and has finished miscellaneous service from the R4 version, comprises visual telephone service.The basic network element that this system architecture comprises is: user equipment (UE), and WCDMA system base-station NODE B, WCDMA system base-station controller (RNC), MGW and MSCSERVER, a kind of basic networking relation of this system architecture is referring to shown in Figure 1.

UE: i.e. the terminal equipment of user's use often is called mobile phone.

NODE B: mainly be responsible for the wireless signal transmitting-receiving.

RNC: mainly be responsible for the management of Radio Access Network.

MGW: mainly be responsible for the management of various bearing resources, connect the practical operation of net.

MSC SERVER: be the core of system, mainly be responsible for the logic control of miscellaneous service, unified scheduling various network resources generates message registration.

A interface: space interface signaling passage.

B interface: business datum passage.

C interface: media gateway controlling signalling path.

D interface: BICC/ISUP/SIP signalling path.

The WCDMA 3-G (Generation Three mobile communication system) provides a kind of Multimedia of being called call the business of (being multimedia call), and this business can be finished voice call function, and data communication facility also can be finished video telephone function.

In order to realize above-mentioned multimedia call service, need use following signaling and agreement:

1, H.245 the H.245 protocol definition worked out of control protocol for multimedia communication: ITU-T how in wall scroll business datum passage by a series of negotiations, set up the process of many Media Stream passages; Stipulated that (this process is carried out the back communication two party just can know the medium type that the other side supports to the terminal capability negotiation process, as voice, video, etc.), the principal and subordinate to differentiate (determining master slave relation), multiplexing control information mutual (transmitting many Media Streams simultaneously in order being supported in the service channel), to open and close Media Stream passage etc.

Described H.245 signaling message mainly contains two classifications:

The firstth, for setting up the signaling message of preparing before the Media Stream passage, comprise that terminal capability sends message (TCS) and response message, the principal and subordinate differentiates message (MSD) and response message, and multi-meter sends message (MUXTBSND) and response message.

The secondth, the signaling message of opening and closing Media Stream passage comprises and opens Media Stream path message (OLC) and response message, closes Media Stream path message (CLC) and response message.OLC message can once be set up a forward direction or a pair of two-way media circulation road, open Media Stream channel command response (OLC ACK) message if receive the other side, represent that then both sides have successfully set up the Media Stream passage, if what receive is to open Media Stream channel command refusal response message (OLC REJECT) or overtimely do not receive response, the failure of Media Stream passage is set up in expression.Closing the Media Stream passage also needs to receive the response message of success, and then expression is closed successfully.

2, H.223 the H.223 agreement of low bit rate multimedia communication multiplex protocol: ITU-T formulation makes communicating pair can utilize single business datum passage to transmit many voice, video and data medium stream simultaneously, and it needs in conjunction with H.245 co-operation.Referring to shown in Figure 2, be layer of structure schematic diagram H.223, its application layer (service object H.223 just) provides and receives the module of various voice, video or data (such as the microphone of a mobile phone terminal, display screen or camera), orlop is that physical layer is a business datum passage, from Fig. 2 as seen, H.223 support to utilize the wall scroll physical channel to transmit multiplexing Media Stream.

The implementation that has two kinds of described multimedia call services at present.

Scheme one: in the WCDMA 3-G (Generation Three mobile communication system) circuit domain, the foundation of multimedia call is divided into two stages: the phase I is to finish continuing of calling and set up the bearer service passage between the user by the mode of data service, second stage, after replying, the user by terminal in the bearer service passage with in mode set up the Signalling exchange of Media Stream, the voice of determining to set up, video and (or) data medium stream, this has just set up multimedia call.Set up the operation of Media Stream carries out in band fully by second stage, relevant signaling is not passed through MSC SERVER, therefore MSC SERVER does not understand fully to the situation of setting up of Media Stream passage, does not know the specifically communication of which medium type in carrying out voice, video or data of user.

Scheme two: the implementation method of the another kind of multimedia call in the WCDMA 3-G (Generation Three mobile communication system) circuit domain can also be carried out the process of negotiation of media streams from changing into outside band in band.Realize by expansion space interface signaling and relaying signaling, two kinds of fundamental method are arranged: a kind of method is to allow space interface signaling and relaying signaling support the H.245 transmission of message, the user can set up multimedia call by the method for existing multimedia call substantially, and the main difference point is that H.245 message is by being with outer the transmission; Another kind method is to increase the cell be used for negotiation of media streams in space interface signaling and relaying signaling, carries the information such as type, bar number, encoding and decoding and multiplexing Control Parameter of the Media Stream that the calling party will set up in the message that makes a call.The information such as encoding and decoding that allow network or the called medium stream information that returns acceptance in ALERTING message or call progress message and selecting use are set up Media Stream when call answering, realize the function of multimedia call.

IMS is a kind of new IP-based framework that the WCDMAR5 version proposes, and it provides a cover new session management mechanism based on SIP.The IMS system provides repeatedly chance for the media negotiation in the session, once be to set up process in session just can determine, but the user may wish in communication process to revise the medium set up (such as, when setting up in the process, session only establishes voice flow, wished to carry out video calling afterwards, needed to increase video media stream).The heavily negotiations process of IMS support media, this process make IMS territory user to increase for the session of having set up, to revise or the deletion Media Stream, and detailed description can be with reference to 3GPP TS 24.228, and its flow process is referring to shown in Figure 3.

Summary of the invention

The invention provides a kind of CS territory and IMS territory and carry out the implementation method of multimedia call intercommunication, in order to solve still the be unrealized problem of multimedia call intercommunication in CS territory and IMS territory of present WCDMA system.

The inventive method comprises the following steps:

The bearing mode that keeps the CS territory, and the carrying in IMS territory is converted to the bearing mode in CS territory, to realize the intercommunication of bearing mode; And according to the transmission means of CS territory media stream control signaling, the corresponding intercommunication of finishing CS territory and IMS territory Media Stream.

Wherein, by the bearing mode in IMS terminal conversion CS territory and IMS territory, to realize the intercommunication of bearing mode.

Further, the bearing mode in described IMS terminal conversion CS territory and IMS territory comprises: the H.223 multiplex stream that the IMS terminal will be sent from the CS territory is decomposed into independently Media Stream; And independent media's stream that the IMS terminal will mail to the CS territory is merged into H.223 multiplex stream.The IMS domain network side is by for each multimedia call distributes a bearer service passage, and with multiplex mode transparent transmission Media Stream H.223, simulates the bearing mode in CS territory, with the intercommunication of realization bearing mode.

Wherein, by the bearing mode in MGCF conversion CS territory and IMS territory, to realize the intercommunication of bearing mode.

Further, the bearing mode in described MGCF conversion CS territory and IMS territory comprises: the H.223 multiplex stream that MGCF will flow to the IMS territory from the CS territory is decomposed into independently Media Stream, and independently Media Stream transmits to the IMS terminal; And independent media's stream that MGCF will flow to the CS territory from the IMS territory merges into H.223 multiplex stream, and H.223 multiplex stream transmits to the CS terminal.

If adopt bearing mode by IMS terminal conversion CS territory and IMS territory, then can media stream control signaling described in the CS territory by the business datum passage with in mode transmit.

Initiate multimedia call from the CS territory to the IMS territory, or initiate multimedia call, comprise following substep: A1, between CS territory and IMS territory user, set up transparent bearer service passage from the IMS territory to the CS territory; B1, communication each side set up and close Media Stream according to mode H.245, to finish the intercommunication of Media Stream in described bearer service passage; Releasing bearing resource when C1, end of calling is finished the processing of taking out stitches.

If adopt bearing mode by MGCF conversion CS territory and IMS territory, then can media stream control signaling described in the CS territory by the business datum passage with in mode transmit.

Initiate multimedia call from the CS territory to the IMS territory, comprise following substep: A2, finish call proceeding; B2, set up IMS territory side Media Stream passage, and the corresponding CS territory side Media Stream passage of setting up, and the two is linked to each other, to finish the intercommunication of Media Stream; In C2, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory; Perhaps, initiate to open or close the operation of multimedia passage by IMS territory terminal to CS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control CS territory; Releasing bearing resource when D2, end of calling is finished the processing of taking out stitches.

Perhaps, initiate multimedia call, comprise following substep: A3, finish call proceeding, and MGCF is to the default media negotiation result of IMS terminal answer, to set up the Media Stream passage of IMS territory side from the IMS territory to the CS territory; B3, MGCF set up the Media Stream passage of CS territory side according to default negotiation result, and the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side are linked to each other, to finish the intercommunication of Media Stream; In C3, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory; Perhaps, initiate to open or close the operation of multimedia passage by IMS territory terminal to CS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control CS territory; Releasing bearing resource when D3, end of calling is finished the processing of taking out stitches.Media negotiation result default described in the steps A 3 comprises: the result one: MGCF accepts the Media Stream passage from the IMS territory to the CS territory that IMS user's desire is set up, and the Media Stream passage from the CS territory to the IMS territory of refusal IMS user desire foundation; Perhaps, as a result two: all Media Stream passages that MGCF refusal IMS user desire is set up; Perhaps, as a result three: MGCF accepts all Media Stream passages that IMS user's desire is set up.After the CS terminal responds, carry out media negotiation between IMS terminal and the CS terminal, and the Media Stream passage that correction has been set up according to negotiation result.

If adopt bearing mode, then can transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory by MGCF conversion CS territory and IMS territory.

Further, described media stream control signaling information is with H.245 formal representation.

Initiate multimedia call from the CS territory to the IMS territory, comprise following substep: A4, finish call proceeding, and MGCF is to the default media negotiation result of CS territory terminal answer, to set up the Media Stream passage of CS territory side; After B4, the user answer of IMS territory, MGCF reconstructs the Media Stream passage of MGCF and IMS terminal according to the situation of setting up of Media Stream among the A4, and the Media Stream passage of IMS terminal and the Media Stream passage of CS terminal are linked to each other, to finish the intercommunication of Media Stream; In C4, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory; Perhaps, initiate to open or close the operation of multimedia passage by IMS territory terminal to CS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control CS territory; Releasing bearing resource when D4, end of calling is finished the processing of taking out stitches.Also comprise in the described steps A 4: CS territory user initiates to set up the Media Stream of CS terminal and IMS terminal in calling procedure; And before replying, the Media Stream that MGCF select to accept or refusal CS territory user initiates to set up, and MGCF is according to default mode immediately or postpone setting up Media Stream from MGCF to the IMS terminal.

Perhaps, initiate multimedia call from the IMS territory to the CS territory, comprise following substep: A5, finish call proceeding, and MGCF is after receiving the multimedia call request, the Media Stream passage of CS territory side is set up in initiation, and reply to IMS territory terminal according to the result who sets up, with the corresponding Media Stream passage of setting up IMS territory side; B5, MGCF link to each other the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side, to finish the intercommunication of Media Stream; In C5, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory; Perhaps, initiate to open or close the operation of multimedia passage by IMS territory terminal to CS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control CS territory; Releasing bearing resource when D5, end of calling is finished the processing of taking out stitches.

Further, described media stream control signaling information is by transmitting with the mode of call control signalling binding.

Initiate multimedia call from the CS territory to the IMS territory, perhaps initiate multimedia call, comprise following substep: A6, finish call proceeding, and in the call proceeding process, finish media negotiation, to set up the Media Stream passage of CS territory side and IMS territory side from the IMS territory to the CS territory; B6, MGCF link to each other the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side, to finish the intercommunication of Media Stream; In C6, the communication process, when CS territory user or IMS territory user initiate media re-negotiation, conversion in signaling and the carrying is carried out in CS territory and IMS territory by MGCF.

Beneficial effect of the present invention is as follows:

Ripe and widely apply based on the Softswitch technology of WCDMAR4, there has been a large number of users to carry out visual telephone service at present by the multimedia call service that WCDMA R4 CS territory provides.IMS is representing following a kind of developing direction as a kind of new framework among a kind of WCDMA, and it supports multimedia call equally.Because IMS still is among the development perfecting process, can predict, in long a period of time, will coexist based on Softswitch technology and the IMS of WCDMAR4.

The inventive method is carried out intercommunication from bearing mode and these two aspects of Media Stream to the multimedia call in CS territory and IMS territory.At first, the present invention keeps the bearing mode in CS territory, and the carrying in IMS territory is converted to the bearing mode in CS territory, to realize the intercommunication of bearing mode; Described carrying conversion can be finished by the IMS terminal, is perhaps finished by MGCF.Secondly, according to the transmission means of CS territory media stream control signaling, the corresponding intercommunication of finishing CS territory and IMS territory Media Stream; The transmission means of described CS territory media stream control signaling be by the business datum passage with in mode transmit, or transmit with out-band method by the call signaling passage.

Enforcement by the inventive method, make and to carry out multimedia call between the user under CS territory and the IMS territory framework, the equipment availability that this has improved operator helps the potentiality that operator fully excavates existing equipment, provides means for the user under two kinds of frameworks carries out multimedia call.

Description of drawings

Fig. 1 is the framework schematic diagram of existing WCDMA communication system;

Fig. 2 is a layer of structure schematic diagram H.223;

Fig. 3 is the signaling process figure of media re-negotiation in the IMS territory;

Fig. 4 is the inventive method flow chart of steps;

Fig. 5 is the schematic diagram by the bearing mode in IMS terminal conversion CS territory and IMS territory;

Fig. 6 is the schematic diagram by the bearing mode in MGCF conversion CS territory and IMS territory;

Fig. 7 is the signaling process figure of situation two;

Fig. 8 initiates heavily to consult signaling process figure under the normal condition for CS territory in the situation two to the IMS territory;

Fig. 9 initiates heavily to consult signaling process figure under the abnormal conditions for CS territory in the situation two to the IMS territory;

Figure 10 initiates heavily to consult signaling process figure under the normal condition for IMS territory in the situation two to the CS territory;

Figure 11 initiates heavily to consult signaling process figure under the abnormal conditions 1 for IMS territory in the situation two to the CS territory;

Figure 12 initiates heavily to consult signaling process figure under the abnormal conditions 2 for IMS territory in the situation two to the CS territory;

Figure 13 is the signaling process figure of situation three;

Figure 14 is the signaling process figure of example one;

Figure 15 is the signaling process figure of example two;

Figure 16 is the signaling process figure of example three;

Figure 17 is the signaling process figure of example four.

Embodiment

Can carry out multimedia call in order to make between the user under CS territory and the IMS territory framework, realize the multimedia call intercommunication in CS territory and IMS territory, the invention provides a kind of CS territory and IMS territory and carry out the implementation method of multimedia call intercommunication,, comprise following key step referring to shown in Figure 4:

The bearing mode in S1, reservation CS territory.

The bearing mode in CS territory remains unchanged, and still adopts H.223 multiplex mode.

S2, the carrying in IMS territory is converted to the bearing mode in CS territory.

The invention provides two kinds IMS territory carrying is converted to the mode of CS territory carrying, to realize the intercommunication of bearing mode.

Carrying conversion regime one: referring to shown in Figure 5, by the bearing mode in IMS terminal conversion CS territory and IMS territory.

In the IMS end side, comprising: the H.223 multiplex stream that the IMS terminal will be sent from the CS territory is decomposed into independently Media Stream; And independent media's stream that the IMS terminal will mail to the CS territory is merged into H.223 multiplex stream.

At the IMS network side,, and, simulate the bearing mode in CS territory with multiplex mode transparent transmission Media Stream H.223 for each multimedia call is set up a service channel.Thereby to realize the intercommunication of bearing mode.

Carrying conversion regime two: referring to shown in Figure 6, by the bearing mode in MGCF conversion CS territory and IMS territory.

In this carrying conversion regime, keep original IMS territory bearing mode (promptly adopting each bar Media Stream of transmission separately), realize the mutual conversion of CS territory and IMS territory bearing mode at MGCF.The bearing mode in described MGCF conversion CS territory and IMS territory comprises: the H.223 multiplex stream that MGCF will flow to the IMS territory from the CS territory is decomposed into independently Media Stream, and independently Media Stream transmits to the IMS terminal; And independent media's stream that MGCF will flow to the CS territory from the IMS territory merges into H.223 multiplex stream, and H.223 multiplex stream transmits to the CS terminal.

S3, determine the transmission means of CS territory media stream control signaling.

The CS territory adopts BICC/ISUP to call out control, and the IMS territory adopts SIP to carry out session control.Though the signaling type difference is adopted in two territories, call flow interosculates: all have initiation, the ring of calling (session), the operation of replying and take out stitches.The directly intercommunication of call proceeding process, its process can be referring to the chapters and sections of 3GPPTS 24.228 about CS and IMS intercommunication.

The mode that the main difference point that CS territory and IMS field multimedia are called out (session) is to establish the Media Stream passage is different.According to the difference of CS territory media stream control signaling transmission means, the intercommunication of Media Stream has different processing.

The transmission means one of CS territory media stream control signaling: media stream control signaling described in the CS territory by the business datum passage with in mode transmit.

The transmission means two of CS territory media stream control signaling: transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory.

S4, the corresponding intercommunication of finishing CS territory and IMS territory Media Stream.

Transmission means with two kinds of CS territory media stream control signaling among two kinds among above-mentioned steps S2 carrying conversion regimes, the step S3, and (CS territory user initiates to initiate multimedia call side, or IMS territory user initiates) combination mutually, include but not limited to following seven kinds of situations.

● situation one: by the bearing mode in IMS terminal conversion CS territory and IMS territory; Media stream control signaling described in the CS territory by industry data affair passage with in mode transmit; Initiate multimedia call from the CS territory to the IMS territory, or initiate multimedia call from the IMS territory to the CS territory, intercommunication is handled and is comprised the following steps:

The first step, the mode of carrying out the audio call intercommunication with reference to CS territory and IMS territory are finished the processing of conventional CS territory call proceedings such as calling out initiation, ring and reply, set up a transparent service channel (being used for Media Streams such as transferring voice, video) between the user.

Second step, CS territory and IMS territory communication each side set up and close Media Stream such as Media Stream and operate by the mode of regulation H.245 in the service channel of having set up, carry out multi-media communication.

Discharge transfer resource when the 3rd step, end of calling, finish the processing of taking out stitches.

● situation two: by the bearing mode in MGCF conversion CS territory and IMS territory; Media stream control signaling described in the CS territory by the business datum passage with in mode transmit; Initiate multimedia call from the CS territory to the IMS territory, referring to shown in Figure 7, intercommunication is handled and is comprised the following steps:

The first step: CS territory user initiates multimedia call to IMS territory user, finish calling initiation, ring, basic call such as reply and continue.After MGCF receives the multimedia call request in CS territory; when making a call, the IMS territory can select to set up Media Stream (reason is just can carry out media negotiation after the CS territory requires replying); perhaps set up from MGCF to the Media Stream IMS user (because the user can set up Media Streams such as voice and/or video usually, just the CS territory set up these Media Streams opportunity after this).

Second step: after calling (session) is replied, if first step IMS side has been set up Media Stream, then set up the respective media stream of CS side at this moment, and the Media Stream of IMS side with the CS side linked to each other, so that the user to be provided complete Media Stream passage, if set up failure then by heavily consulting the respective media stream that flow process is removed IMS.

The 3rd step: in the communication process, the operation open (or closing) Media Stream passage may be initiated to the IMS territory in the CS territory, and MGCF is by heavily consulting to set up (or closing) respective media stream in the IMS territory.

Heavily consult to exist normal condition and abnormal conditions described in this step.

Referring to (illustrate: MGCF can be any version of 3GPP regulation with the media re-negotiation flow process on the right side among the figure, is not limited to illustrated flow process, down together) shown in Figure 8, the normal condition of described heavy negotiation comprises the following steps:

1, (or closing) Media Stream passage is initiated to open to the IMS territory in the CS territory.

2 to 13, MGCF acts on behalf of the CS territory and finishes the media re-negotiation operation that the Media Stream in IMS territory increases (or minimizing).

14, MGCF replys to the CS territory and opens (or closing) Media Stream passage success response message.

Referring to shown in Figure 9, in the abnormal conditions of described heavy negotiation, after the IMS territory initiates to open (or closing) Media Stream passage,, open the response of (or closing) Media Stream passage refusal to the answer of CS territory by MGCF if overtime or other any failure takes place IMS in the CS territory.

The 4th step: in the communication process, the IMS territory may be by heavily consulting to set up (closing) Media Stream to the CS territory, and MGCF controls the CS territory and opens (or closing) Media Stream.

Heavily consult to exist normal condition and two kinds of abnormal conditions described in this step.

Referring to shown in Figure 10, the normal condition of described heavy negotiation comprises the following steps:

1, (or closing) Media Stream passage is initiated to open to the CS territory in the IMS territory.

2 to 4, MGCF acts on behalf of the IMS territory and finishes the Media Stream in CS territory and open (or closing), need handle a plurality of Media Streams if the SDP in the INVITE shows, this step need repeat so, finishes up to the operational processes of all Media Streams.

5 to 14, MGCF acts on behalf of the CS territory and finishes the subsequent media negotiations process of IMS territory.

Referring to shown in Figure 11, in first kind of abnormal conditions of described heavy negotiation, after the CS territory initiates to open the Media Stream passage,, handle by the failure that MGCF carries out media re-negotiation by existing regulation if the CS territory takes place overtime or replys refuse information in the IMS territory.

Referring to shown in Figure 12, in second kind of abnormal conditions of described heavy negotiation, after the CS territory initiates to set up the Media Stream passage and receive success response message,, initiate to close the Media Stream passage processing of opened (or closing) to the CS territory by MGCF in the IMS territory if overtime or other any failure takes place IMS.

The 5th step: take out stitches during end of calling.

In this situation, the 3rd step and the 4th step do not have fixing precedence relationship, and the 3rd step and the 4th can repeatedly initiate before taking out stitches.

● situation three: by the bearing mode in MGCF conversion CS territory and IMS territory; Media stream control signaling described in the CS territory by the business datum passage with in mode transmit; Initiate multimedia call from the IMS territory to the CS territory, referring to shown in Figure 13, intercommunication is handled and is comprised the following steps:

The first step, calling (session) establishment stage, finish calling initiation, ring, basic call such as reply and continue.When from the IMS territory when multimedia call is initiated in the CS territory, because the foundation of CS territory Media Stream passage must just begin to carry out after replying, and the IMS territory can just begin to carry out the negotiation of Media Stream when the initiation session by normal handling, and requires media negotiation just to obtain confirming and finishing media negotiation before called party answer.Because the opportunity of two territory media negotiations is inconsistent, therefore when IMS when initiation session is carried out media negotiation, MGCF can only suppose the result that media negotiation is carried out in a kind of and CS territory earlier in advance, before replying, reply IMS user, complying with IMS session flow process, and real negotiation is carried out between IMS and CS after replying again.

MGCF can following hypothesis and the media negotiation result in CS territory:

I) MGCF accepts the Media Stream from IMS to CS that IMS user initiates to set up, the Media Stream from CS to IMS that refusal IMS user initiates to set up.(because CS territory user might be ready to accept the Media Stream from IMS, just also do not arrive the stage that wish is expressed in the CS territory on the flow process, if MGCF refuses the Media Stream from IMS to CS at this moment, when having arrived the back so and really having consulted Media Stream, IMS user has to repeat to express the wish of twice hope foundation from IMS to the CS Media Stream in a session, and user experience is bad.Therefore, MGCF supposition CS territory user earlier is ready to accept, even CS territory user really determines to be unwilling to accept this type of Media Stream in the back, MGCF also can be at this moment by initiating heavily to consult to close this Media Stream to IMS user.And the Media Stream from the CS territory to IMS territory direction can initiatively be initiated and be set up by CS territory user, so MGCF can refuse the Media Stream of this direction when the first media negotiation of IMS).

Ii) MGCF refuses all Media Streams that IMS user wishes.

Iii) MGCF accepts all Media Streams that IMS user wishes.

Second step, MGCF are established to the Media Stream in CS territory according to the negotiation result of hypothesis in advance of the first step, if the Media Stream that needs foundation is arranged, and if set up failure, then MGCF initiates heavily to consult the corresponding Media Stream that dismounting has been set up in the IMS territory.

The 3rd step, in the communication process, the operation of opening (or closing) Media Stream passage may be initiated to the IMS territory in the CS territory, MGCF is by heavily consulting to set up (or closing) respective media stream in the IMS territory.

Take out stitches when the 5th step, end of calling.

● situation four: by the bearing mode in IMS terminal conversion CS territory and IMS territory; Transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory; Described media stream control signaling information is with H.245 formal representation; Initiate multimedia call from the CS territory to the IMS territory, intercommunication is handled and is comprised the following steps:

The first step, CS territory user initiate multimedia call to IMS territory user, finish calling initiation, ring, basic call such as reply and continue.Media Stream (reason is can not carry medium stream information in the IAM message that the CS territory making a call) can be selected not set up in the IMS territory when call out initiating, perhaps select to set up default Media Stream (because the user can set up voice and Media Stream such as (or video) in calling procedure afterwards usually).In the call establishment after making a call, CS territory user may initiate to set up the operation of Media Stream passage, but because IMS need can begin the media re-negotiation process after replying, therefore, MGCF can select temporarily to refuse these from these requests of CS territory user or temporarily by supposing that IMS territory user accepts these request mode and handles, and sets up the Media Stream passage of CS territory to MGCF earlier.

Second step: behind the called subscriber answer, the situation of the Media Stream passage that comprehensive CS side of MGCF or IMS side are set up, if having some media channel does not finish as yet, the Media Stream passage that promptly only has CS side or IMS side, then be established to the media channel of opposite side by MGCF, and the Media Stream of both sides linked to each other, so that the user to be provided complete Media Stream passage, if set up failure then by heavily consulting the respective media stream that flow process is removed the opposite side of having set up.

The 3rd step: follow-up heavily negotiations process of the Media Stream in communication process, and the disconnect process during end of calling, basic identical to step 5 with the step 3 in the above-mentioned situation two, difference is that H.245 message is that the passage out-band channel transmits.

● situation five: by the bearing mode in IMS terminal conversion CS territory and IMS territory; Transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory; Described media stream control signaling information is with H.245 formal representation; Initiate multimedia call from the IMS territory to the CS territory, intercommunication is handled and is comprised the following steps:

The first step: call out (session) establishment stage, finish calling initiation, ring, the basic call operation that continues such as reply.When from the IMS territory when multimedia call (session) is initiated in the CS territory, the IMS territory can just be carried Media Stream ginseng information when the initiation session by normal handling and be begun to carry out the negotiation of Media Stream, and requires media negotiation just to obtain confirming and finishing media negotiation before called party answer.MGCF is when receiving IMS to the multimedia call request in CS territory, and the Media Stream passage that needs the call answering forward direction just to be initiated to the CS territory is set up process, replys to the IMS side according to the result who sets up success or not.

Second step: follow-up heavily negotiations process of the Media Stream in communication process, and the disconnect process during end of calling, basic identical to step 5 with the step 3 in the above-mentioned situation two, difference is that H.245 message transmits by out-band channel.

● situation six: by the bearing mode in IMS terminal conversion CS territory and IMS territory; Transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory; Described media stream control signaling information is by transmitting with the mode of call control signalling binding; Initiate multimedia call from the CS territory to the IMS territory, intercommunication is handled and is comprised the following steps:

The first step: CS territory user initiates multimedia call to IMS territory user, finish calling initiation, ring, basic call such as reply and continue.The CS territory begins to carry out media negotiation can carrying media information when the IMS territory makes a call, this media consultation process with the IMS territory is consistent, therefore, only need MGCF when IMS territory user initiates a session request, in conversation request message, carry the CS territory and wish the medium stream information set up, when receiving the final acknowledge message of IMS territory user, feed back negotiation result, the Media Stream that establishment will be set up to the CS territory by the ring or the call progress message in CS territory.

Second step: in communication process, CS territory user or IMS territory user may initiate media re-negotiation, because the flow process unanimity, the conversion that this process only needs MGCF that CS territory and IMS territory are carried out in signaling and the carrying gets final product.

● situation seven: by the bearing mode in IMS terminal conversion CS territory and IMS territory; Transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory; Described media stream control signaling information is by transmitting with the mode of call control signalling binding; Initiate multimedia call from the IMS territory to the CS territory, intercommunication is handled and is comprised the following steps:

The first step: IMS territory user initiates multimedia call to CS territory user, finish calling initiation, ring, basic call such as reply and continue.The IMS territory begins to carry out media negotiation can carrying media information when the CS territory makes a call, this media consultation process with the IMS territory is consistent, therefore, only need MGCF when CS territory user initiates a session request, in conversation request message, carry the IMS territory and wish the medium stream information set up, when receiving the final affirmation message of CS territory user, by the message feedback negotiation result that is used for media negotiation in IMS territory, the Media Stream that establishment will be set up.

Below specifically describe the inventive method by four examples.

 method example one: corresponding above-mentioned situation one, and CS territory user initiates multimedia call to IMS territory user, referring to shown in Figure 14, comprises following concrete steps:

1 to 17, the processing that makes a call to IMS user of CS user, this process finish calling initiation, ring, reply and between the user, set up a business datum passage.

18, set up Media Stream passage process according to agreement H.245.

Finish the processing of taking out stitches during end of calling.

 method example two: corresponding above-mentioned situation one, and IMS territory user initiates multimedia call to CS territory user, referring to shown in Figure 15, comprises following concrete steps:

1 to 17, the processing that makes a call to CS user of IMS user, this process finish calling initiation, ring, reply and between the user, set up a business datum passage.

18, set up Media Stream passage process according to agreement H.245.

Finish the processing of taking out stitches during end of calling.

 method example three: corresponding above-mentioned situation two, and CS territory user initiates multimedia call to IMS territory user, referring to shown in Figure 16, comprises following concrete steps:

The first step (1 to 4), CS territory user initiate multimedia call to IMS territory user, finish calling initiation, ring, basic call such as reply and continue.Media Stream wouldn't be set up in the IMS territory when media negotiation.

(or closing) Media Stream passage is initiated to open to the IMS territory in second step (5 to 7), CS territory, and the IMS territory is by heavily consulting to set up (or closing) respective media stream.

The 3rd step (8 to 11), IMS territory are by heavily consulting to set up (closing) Media Stream to the CS territory, and corresponding opening (or closing) Media Stream is initiated in the CS territory.

Take out stitches when the 4th step, end of calling.

 method example four: corresponding above-mentioned situation three, and IMS territory user initiates multimedia call to CS territory user, referring to shown in Figure 17, comprises following concrete steps:

The first step (1 to 4), call out (session) establishment stage, finish calling initiation, ring, basic call such as reply and continue.MGCF supposes the result that media negotiation is carried out in a kind of and CS territory, answer IMS user replying before in advance.

Second step (5 to 7), be established to the Media Stream passage in CS territory according to the default media negotiation result of the first step.

(or closing) Media Stream passage is initiated to open to the IMS territory in the 3rd step (8 to 10), CS territory, and the IMS territory is by heavily consulting to set up (or closing) respective media stream.(this process has detailed description at signalling interworking one joint above.)

The 4th step (11 to 14), IMS territory are by heavily consulting to set up (closing) Media Stream to the CS territory, and corresponding opening (or closing) Media Stream is initiated in the CS territory.

Take out stitches when the 5th step, end of calling.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims

1, the implementation method of multimedia call intercommunication is carried out in a kind of CS territory and IMS territory, it is characterized in that, comprises the following steps:

The bearing mode that keeps the CS territory, and the carrying in IMS territory is converted to the bearing mode in CS territory, to realize the intercommunication of bearing mode; And

According to the transmission means of CS territory media stream control signaling, the corresponding intercommunication of finishing CS territory and IMS territory Media Stream.

2, the method for claim 1 is characterized in that, by the bearing mode in IMS terminal conversion CS territory and IMS territory, to realize the intercommunication of bearing mode.

3, method as claimed in claim 2 is characterized in that, the bearing mode in described IMS terminal conversion CS territory and IMS territory comprises:

The H.223 multiplex stream that the IMS terminal will be sent from the CS territory is decomposed into independently Media Stream; And

Independent media's stream that the IMS terminal will mail to the CS territory is merged into H.223 multiplex stream.

4, method as claimed in claim 3 is characterized in that, the bearing mode in IMS domain network side simulation CS territory is to realize the intercommunication of bearing mode.

5, method as claimed in claim 4 is characterized in that, distributes a bearer service passage by being each multimedia call, and with multiplex mode transparent transmission Media Stream H.223, simulates the bearing mode in CS territory.

6, the method for claim 1 is characterized in that, by the bearing mode in MGCF conversion CS territory and IMS territory, to realize the intercommunication of bearing mode.

7, method as claimed in claim 6 is characterized in that, the bearing mode in described MGCF conversion CS territory and IMS territory comprises:

The H.223 multiplex stream that MGCF will flow to the IMS territory from the CS territory is decomposed into independently Media Stream, and independently Media Stream transmits to the IMS terminal; And

MGCF will flow to independent media's stream in CS territory from the IMS territory and merge into H.223 multiplex stream, and H.223 multiplex stream transmits to the CS terminal.

8, as each described method of claim 2 to 5, it is characterized in that, media stream control signaling described in the CS territory by the business datum passage with in mode transmit.

9, method as claimed in claim 8 is characterized in that, initiates multimedia call from the CS territory to the IMS territory, or initiates multimedia call from the IMS territory to the CS territory, comprises following substep:

A1, between CS territory and IMS territory user, set up transparent bearer service passage;

B1, communication each side set up and close Media Stream according to mode H.245, to finish the intercommunication of Media Stream in described bearer service passage;

Releasing bearing resource when C1, end of calling is finished the processing of taking out stitches.

10, as claim 6 or 7 described methods, it is characterized in that, media stream control signaling described in the CS territory by the business datum passage with in mode transmit.

11, method as claimed in claim 10 is characterized in that, initiates multimedia call from the CS territory to the IMS territory, comprises following substep:

A2, finish call proceeding;

B2, set up IMS territory side Media Stream passage, and the corresponding CS territory side Media Stream passage of setting up, and the two is linked to each other, to finish the intercommunication of Media Stream;

In C2, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory;

Perhaps, initiate to open or close the operation of multimedia passage by IMS territory terminal to CS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control CS territory;

Releasing bearing resource when D2, end of calling is finished the processing of taking out stitches.

12, method as claimed in claim 10 is characterized in that, initiates multimedia call from the IMS territory to the CS territory, comprises following substep:

A3, finish call proceeding, and MGCF replys default media negotiation result to the IMS terminal, to set up the Media Stream passage of IMS territory side;

B3, MGCF set up the Media Stream passage of CS territory side according to default negotiation result, and the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side are linked to each other, to finish the intercommunication of Media Stream;

In C3, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory;

Releasing bearing resource when D3, end of calling is finished the processing of taking out stitches.

13, method as claimed in claim 12 is characterized in that, media negotiation result default described in the steps A 3 comprises:

As a result one: MGCF accepts the Media Stream passage from the IMS territory to the CS territory that IMS user's desire is set up, and the Media Stream passage from the CS territory to the IMS territory set up of refusal IMS user desire;

Perhaps, as a result two: all Media Stream passages that MGCF refusal IMS user desire is set up;

Perhaps, as a result three: MGCF accepts all Media Stream passages that IMS user's desire is set up.

14, method as claimed in claim 12 is characterized in that, after the CS terminal responds, carries out media negotiation between IMS terminal and the CS terminal, and the Media Stream passage that correction has been set up according to negotiation result.

15, as each described method of claim 2 to 5, it is characterized in that, transmit with out-band method by the call signaling passage in media stream control signaling described in the CS territory.

16, method as claimed in claim 15 is characterized in that, described media stream control signaling information is with H.245 formal representation.

17, method as claimed in claim 16 is characterized in that, initiates multimedia call from the CS territory to the IMS territory, comprises following substep:

A4, finish call proceeding, and MGCF replys default media negotiation result to CS territory terminal, to set up the Media Stream passage of CS territory side;

After B4, the user answer of IMS territory, MGCF reconstructs the Media Stream passage of MGCF and IMS terminal according to the situation of setting up of Media Stream among the A4, and the Media Stream passage of IMS terminal and the Media Stream passage of CS terminal are linked to each other, to finish the intercommunication of Media Stream;

In C4, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory;

Releasing bearing resource when D4, end of calling is finished the processing of taking out stitches.

18, method as claimed in claim 17 is characterized in that, also comprises in the described steps A 4: CS territory user initiates to set up the Media Stream of CS terminal and IMS terminal in calling procedure; And before replying, the Media Stream that MGCF select to accept or refusal CS territory user initiates to set up, and MGCF is according to default mode immediately or postpone setting up Media Stream from MGCF to the IMS terminal.

19, method as claimed in claim 16 is characterized in that, initiates multimedia call from the IMS territory to the CS territory, comprises following substep:

A5, finish call proceeding, and MGCF initiates to set up the Media Stream passage of CS territory side after receiving the multimedia call request, and reply to IMS territory terminal, with the corresponding Media Stream passage of setting up IMS territory side according to the result who sets up;

B5, MGCF link to each other the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side, to finish the intercommunication of Media Stream;

In C5, the communication process, initiate to open or close the operation of multimedia passage by CS territory terminal to IMS territory terminal, MGCF sets up or removes respective media stream by heavily consulting control IMS territory;

Releasing bearing resource when D5, end of calling is finished the processing of taking out stitches.

20, method as claimed in claim 15 is characterized in that, described media stream control signaling information is by transmitting with the mode of call control signalling binding.

21, method as claimed in claim 20 is characterized in that, initiates multimedia call from the CS territory to the IMS territory, perhaps initiates multimedia call from the IMS territory to the CS territory, comprises following substep:

A6, finish call proceeding, and in the call proceeding process, finish media negotiation, to set up the Media Stream passage of CS territory side and IMS territory side;

B6, MGCF link to each other the Media Stream passage of IMS territory side and the Media Stream passage of CS territory side, to finish the intercommunication of Media Stream;

In C6, the communication process, when CS territory user or IMS territory user initiate media re-negotiation, conversion in signaling and the carrying is carried out in CS territory and IMS territory by MGCF.