CN101043252B

CN101043252B - Method and system for transmitting MBMS mechanism based IMS service

Info

Publication number: CN101043252B
Application number: CN2006100604647A
Authority: CN
Inventors: 武亚娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-04-23
Filing date: 2006-04-23
Publication date: 2012-11-21
Anticipated expiration: 2026-04-23
Also published as: CN101043252A

Abstract

The invention relates to transmission method and system of IMS operation which is based on the mechanism of MBMS, during the cause of operation conversation is between the server and client and sending data to the client, when server judges the operation can use MBMS bearing to transmit data, then the building MBMS context request message is transmitted; according to the request information, the client builds MBMS context with BM-SC, server transfers data to BM-SC which sends data to multiple clients using said MBMS. The invention introduces the building cause of MBMS bearing to the IMS operation, MBMS bearing is used directly when it is built, the time of waiting for building the bearing can be saved, when multicast request is not fulfilled, it can switch to single broadcast bearing at any moment, so the time of conversation can be decreased effectively.

Description

A kind of IMS traffic transmission method and system based on MBMS mechanism

Technical field

The present invention relates to multimedia broadcast/group broadcast service (Multimedia Broadcast Multiple Service; MBMS) technology; Be particularly related to a kind of professional transmission technology of IMS (IP Multimedia Subsystem, IP Multimedia System) based on MBMS mechanism.

Background technology

Multicast/broadcast MBMS is a kind of technology that transmits data from a data source to a plurality of targets; In traditional mobile communications network; Sub-district multicast service or broadcasting service (CBS; Cell Broadcast Service) allow low bit rate data to share broadcast channel through the sub-district and send to all users, this kind business belongs to information series business.

Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, and along with the fast development of internet (Internet), a large amount of mobile multi-media services emerge.The some of them mobile multi-media service requires a plurality of users can receive identical data, for example video request program, television broadcasting, video conference, online education, interactive game etc. simultaneously.These mobile multi-media services are compared with general data service, have characteristics such as data volume is big, longer duration, delay sensitive.Present Internet protocol (IP; Internet Protocol) multicast and broadcast technology only are applicable to wired IP communication network; Be not suitable for mobile communications network, because mobile communications network has particular network structure, functional entity and wave point, these are all different with the wire communication IP network.

For effectively utilizing the mobile communications network resource; 3G (Third Generation) Moblie global standards tissue (3GPP; 3rd Generation Partnership Project) proposes the MBMS of mobile communications network, thereby in mobile communications network, provide a data source to send the point-to-multipoint service of data, realize that Internet resources are shared to a plurality of users; Improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBMS that 3GPP proposes can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize multicast and broadcasting that high-speed multimedia is professional, and this has complied with following mobile data Development Trend undoubtedly.

Fig. 1 is for supporting the wireless network architecture sketch map of broadcasting/packet service; As shown in Figure 1; Among the existing 3GPP, support that the wireless network entity of broadcasting/packet service is broadcasting/packet service server (BM-SC), BM-SC is through Gmb interface or Gi interface and critical point GPRS Support Node (GGSN; Gateway GPRSSupport Node) link to each other, a BM-SC can link to each other with a plurality of GGSN; GGSN links to each other through Gn/Gp interface and Serving GPRS Support Node (SGSN, Serving GPRS Support Node), and a GGSN can link to each other with a plurality of SGSN; SGSN can pass through Iu interface and UMTS (UMTS; Universal Mobile Telecommunications System) land radio access web (UTRAN; UMTSTerrestrial radio access network) links to each other; UTRAN links to each other with UE through the Uu interface then, and SGSN also can strengthen wireless access network (GERAN) through Iu/Gb interface and global system for mobile communications and link to each other, and GERAN links to each other with UE through Um Interface then.Wherein, GGSN and SGSN belong to the node in the core net in the wireless network (CN, Core Network).

Can find out from the network configuration that Fig. 1 provides; In order to support MBMS professional; In 3-G (Generation Three mobile communication system), increase mobile network functional entity--broadcast multicast service center, i.e. BM-SC, said BM-SC is content provider's a inlet; Be used for mandate and initiate the MBMS business, and plan transmits the MBMS content to schedule at mobile network.In addition, on functional entitys such as user terminal UE (User Equipment), UTRAN, GERAN, SGSN, GGSN, increase the function relevant with MBMS.

MBMS comprises multicast pattern and broadcast mode, and wherein multicast pattern needs user's corresponding multicast group of contracting, and carries out activation of service, and produces corresponding charge information.Because it is different that multicast pattern and broadcast mode exist on business demand, cause operation flow separately also different, distinguish as shown in Figures 2 and 3, Fig. 2 is the operation flow sketch map of MSMS multicast pattern, Fig. 3 is the operation flow sketch map of MSMS broadcast mode.

As shown in Figure 2; The processing procedure that the MBMS multicast service relates to comprises: signatory (Subscription), service declaration (Service announcement), user's adding (Joining), session begin (Session Start), MBMS notice (MBMS notification), data transmit (Data transfer), conversation end (SessionStop) and user and withdraw from (Leaving), and be specific as follows said.

Signatory process is used for setting up the relation between user and the service supplier, lets the user subscribe to required MBMS service in advance;

Service declaration process is used for promptly notifying user MBMS professional relevant information by the current service that can provide of BM-SC declaration;

User's adition process is a MBMS activation of service process; UE is in adition process; Informing network self is ready to become the member of current multicast group, receives the professional data of corresponding MBMS, and this adition process can be created the MBMS UE context of record UE information in the UE of network and adding multicast group;

Session begins in the process, and BM-SC is ready to transfer of data, and informing network is set up the bearing resource of corresponding core net and Access Network;

The MBMS notification procedure is used for being about to begin by RNC (Radio Network Controller, radio network controller) notice UE MBMS multicast conversation;

In data transfer procedure; BM-SC gives UE through the bearing resource that session begins to set up in the process with transfer of data, and the MBMS business has two kinds of patterns when between UTRAN and UE, transmitting: point-to-multipoint (PTM, Point To Multipoint) pattern and point-to-point (PTP; Point To Point) pattern; The PTM pattern is sent identical data through MBMS point-to-multipoint service channel (MTCH), and all add multicast service or can receive the interested UE of broadcasting service, and ptp mode is through Dedicated Traffic Channel (DTCH; Dedicated Traffic Channel) logic channel sends data, has only a corresponding UE to receive;

The conversation end process is used for the bearing resource that the session process that begins is set up is discharged;

The user withdraws from process makes the subscriber in the group leave multicast group, i.e. user's receiving multicast data no longer, and this process can be with corresponding MBMS UE context deletion.

As shown in Figure 3, processing procedure that the MBMS broadcasting service relates to and MBMS multicast service are similar, just before session begins, need not carry out signatory process and user's adition process, and, after conversation end, need not carry out the user and withdraw from process.

Under the promotion of multiple application; IP-based multimedia subsystem, IMS (IP MultimediaSubsystem) framework appears; Purpose is in the mobile network, to use a kind of structure of standardized opening to realize diversified multimedia application, offers the more impression of selecting and more enriching of user.

The IMS of 3GPP definition is superimposed upon on the packet field network; Form by CSCF (CSCF), MGCF (MGCF), MRF (media resource function) and HSS functional entitys such as (home signature user servers); Wherein CSCF can be divided into three logic entities of S-CSCF (serving CSCF), P-CSCF (proxy CSCF) and I-CSCF (inquiry CSCF) again; S-CSCF is the service switching center of IMS, carries out session control, peace preservation association's speech phase; Be in charge of user profile, produce charge information etc.; P-CSCF is the access point of terminal user access to IMS, accomplishes user's registration, is responsible for QoS control and safety management etc., and I-CSCF is responsible for the intercommunication between the IMS territory, and network topology and configuration are externally hidden in the distribution of management S-CSCF, produce metering data etc.The MGCF control gateway realizes the intercommunication of IMS network and other network, and MRF provides media resource, like the folding and unfolding sound, and encoding and decoding and multimedia conferencing bridge.HSS is a customer data base, the subscription data of storage IMS user terminal and configuration information etc.

On the packet network that the IMS network of 3GPP definition also can be applied to define among the 3GPP2, the intercommunication with the polytype network is provided, realizes and the user uses the independence of terminal type.Presents does not limit IMS and only is applied in relevant network of 3GPP and the application, and the access network of other types and the business of bearer network also can realize with the IMS framework with using.

In IMS, use the signaling control protocol of SIP (Session Initiation Protocol, Session initiation Protocol) as IP multimedia session.

Session initiation Protocol SIP is used for initiation session; It can control the foundation and the termination of the Multimedia session of a plurality of participants' participation; And can dynamically adjust and revise session attribute, as session bandwidth require, the code/decode format of the medium type (voice, video and text etc.) of transmission, medium, to the support of multicast and clean culture etc.

Fast development along with broadband network technology; PoC (PTT over cellular is based on the press-and-talk of cellular system) business occurs at GSM, described PoC service is OMA (open mobile alliance; The Open Mobile Alliance tissue) PTT that on packet network, realizes (the Push To Talk of definition; Press-and-talk) business, wherein, described PTT business is a kind of semiduplex communication technology.

The GSM that is embodied as of PoC service has been introduced the communication pattern that a kind of existing mobile system and traditional voice calling system can't provide.PoC service has guaranteed that expense minimizes when satisfying calling in real time.Simultaneously, PoC service makes it can satisfy the real time communication demand of user terminal low-cost, expeditiously because of it adopts VoIP (packet voice) and semiduplex mode.

At present, definition can know that the pattern that the business of PoC is carried out is as shown in Figure 4 according to OMA, mainly comprises following process:

(1) user who has a PoC capable terminal at first needs with the supplier of PoC service signatory, obtains PoC service and permits;

(2) PoC user finds that through the terminal network possesses the PoC service ability;

(3) PoC user has set up the contact with other PoC user terminals through PoC service supplier;

(4) PoC user can request to make a speech through button, realizes professional.

The network frame structure of corresponding PoC is as shown in Figure 5, mainly comprises PoC client (PoC client), PoC server (PoC server), SIP core (supporting the core net of session initiation protocol), XDMS (XMLDocument Management Server supports the document management server of XML), Presence server (presenting service server) etc.

Can see existing P oC be with PoC based on the SIP Core, utilize the ability of SIP Core realize between the user route with search.Described SIP core can be IMS (IP Multimedia System) network, also can be other networks based on Session Initiation Protocol.

The application of broadcasting multicast service makes bearer network can support the multi-medium data transmission of optimizing; IMS such as being positioned on the application server for one uses; Send identical multi-medium data if desired and give one group of IMS user, the broadcast multi-broadcasting ability that so just can utilize the bottom bearer network to provide uses the MBMS business of this saving interface-free resources and Internet resources to transmit data; Thereby make operator can improve the utilance of resource, cut operating costs.

Such IMS uses and has existed a lot, like PoC service, and conference convention business, DTV, multimedia networking recreation etc.These use generally all is to be limited to the MultiParty Service that carries out in the group; Therefore the demand that identical multi-medium data need send to a plurality of user terminals in the group can occur, therefore can use MBMS mechanism to realize the transfer of data of carrying aspect.

A kind of MBMS mechanism of using that proposes at present realizes that the scheme of PoC service can be as shown in Figure 6, mainly comprises the steps.

When step 101, customer end A need be called out called PoC customer end B, visit PoC server sent solicited message INVITE earlier;

Step 102, through the SIP signaling, multicast address multicast of the called PoC customer end B of PoC server notification;

Step 103, the information of the multicast parameter correlation of PoC customer end B analysis from the INVITE that the PoC server is received indicates customer end B to hope to use the address of the machine-processed up-downgoing of MBMS about the PoC server such as being used for;

If customer end B is supported MBMS mechanism, according to 3GPP TS 23.246 described execution MBMS activations, promptly carry out the context of MBMS and set up, execution in step 104 then;

Step 104, the PoC customer end B is sent 200OK message to the PoC server;

Step 105; The 200OK response message that the PoC server returns to customer end A according to the 200OK message that the PoC customer end B is sent; The indication customer end A also adds the multicast carrying in this 200OK response message, and this indication is to realize through the multicast address of unicast address that carries up usefulness and descending usefulness;

Step 106, customer end A add multicast carries, and carries out MBMS activation, promptly carries out the context of MBMS and sets up;

Step 107, the PoC server sends Receiving Talk Burst to customer end A;

Step 108, the PoC server sends Receiving Talk Burst to customer end B;

Step 109, the media data of PoC session transmits through multicast conversation;

If customer end A or B hope to withdraw from this PoC session, the MBMS context of also wanting deexcitation to set up so simultaneously, i.e. while execution in step 110 and step 111.

Step 110, the MBMS context deactivation process of customer end A;

Step 111, the MBMS context deactivation process of customer end B;

Step 112, the PoC server sends 200OK to customer end A.

PoC service still is a kind of voice service in essence; Therefore to the requirement of real-time than higher, and in the above-mentioned technical scheme, when MBMS mechanism media data is used in the decision of PoC server; Through the INVITE advise called subscriber that sends; At this time the called subscriber just initiates the MBMS session and sets up process, after completion set up in the MBMS context, just continues the negotiations process of PoC session; Also set up the contextual process of MBMS if consider caller, then settling time is just longer.Original relatively PoC session is set up process; The setup delay that increases is oversize; The PoC user that initiation session is set up abandons using current PoC service probably owing to the stand-by period is oversize, change using other communication modes the so long simultaneously use habit that does not also meet user terminal settling time into; Therefore this mechanism must be improved, otherwise can't carry out practical application.

Summary of the invention

In view of this, the present invention provides a kind of IMS traffic transmission method and system based on MBMS mechanism, when introducing MBMS mechanism realizes transfer of data in the realization of PoC service, can effectively reduce the time that session is set up.

A kind of IMS of internet protocol multi-media system traffic transmission method based on multimedia broadcast multi-broadcasting business MBMS mechanism, comprising:

Set up the service conversation between server and the client, server transmits data through mode of unicast and gives client;

Steps A; According to the attribute of current business or/and configuration; Perhaps according to current business participant's distribution situation or/and present position information; When server confirms that current business can be used multimedia broadcast multi-broadcasting business MBMS to carry to transmit data, send and set up multimedia broadcast multi-broadcasting business MBMS context request message;

Step B; Set up the multimedia broadcast multi-broadcasting business MBMS context between client and the broadcasting multicast service server B M-SC; Server is issued BM-SC with data, uses the multimedia broadcast multi-broadcasting business MBMS context of above-mentioned foundation more said data to be sent to a plurality of clients by BM-SC.

Server sends to client or to BM-SC and sets up multimedia broadcast multi-broadcasting business MBMS context request message in the said steps A.In the steps A; When server sends when setting up multimedia broadcast multi-broadcasting business MBMS context request message to BM-SC; Then the multimedia broadcast multi-broadcasting business MBMS context procedures of setting up between client and the BM-SC of step B is specially: BM-SC triggers client through service universal grouping wireless service technology support node SGSN and gateway general packet radio service technical support node GGSN functional entity in the GPRS network according to setting up the contextual solicited message of multimedia broadcast multi-broadcasting business MBMS, and BM-SC sets up multimedia broadcast multi-broadcasting business MBMS context.

Said steps A is specially: according to the attribute of current business or/and configuration, perhaps according to current business participant's distribution situation or/and present position information, server confirms that can use MBMS to carry transmits data.

Said server comprises carries out PF server of participating in session and the CF server of controlling session.Said server is issued BM-SC with data; Using the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC is specially: data are issued the PF server from the CF server; The PF server sends the data to BM-SC again, is used by BM-SC and sets up a plurality of clients that good MBMS context sends the data to these data of reception.

Said server has simultaneously carries out the function of participating in session and control session.

The described MBMS of foundation context request message carries the identification information of indication current business, and this identification information is an ip multicast address.

Said MBMS contextual set up in the process confirm following one of at least: use the contextual professional ip multicast address of using of this MBMS, interim horde group id TMGI, the employed QOS ability of this MBMS loaded service.

Said step B comprises further that behind the MBMS context of setting up between client and the BM-SC BM-SC accomplishes to confirm that the MBMS context is set up to server echo reply message.

Said step B comprises further that behind the MBMS context of setting up between client and the BM-SC user end to server echo reply message is accomplished to confirm that the MBMS context is set up.

Said response message carries the identification information and the identification information that is used to identify the MBMS carrying of having set up of indication current business, and these two kinds of identification informations are used for the session association that server will be set up good MBMS context and carry out on it.

Said method further is included in carries out in the MBMS process, when this service conversation condition changes when causing being not suitable for continue using MBMS mechanism, server according to this situation reuse steps A with mode of unicast transmission data.

A kind of IMS traffic transmission system based on MBMS mechanism; This system comprises at least one client, BM-SC, server; Carry out professional transfer of data between server and the client, wherein, at the service conversation of setting up between server and the client; Server transmits data to after the client through mode of unicast; When server according to the attribute of current business or/and configuration, perhaps according to current business participant's distribution situation or/and present position information when confirming that current business can be used MBMS to carry to transmit data, send and set up the MBMS context request message; Set up the information that the MBMS context request message comprises according to this, client and BM-SC set up the MBMS context, and then server is issued BM-SC with data, use the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC.

Also comprise when server confirms that current business cannot be used MBMS to carry to transmit data, come back to server and transmit the process that data are given client through mode of unicast.

Said server sends to client or to BM-SC and sets up the MBMS context request message.

Said server has simultaneously carries out the function of participating in session and control session.Said server can also comprise carries out PF server of participating in session and the CF server of controlling session; Then said server is issued BM-SC with data; Using the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC is specially: data are issued the PF server from the CF server; The PF server sends the data to BM-SC again, is used by BM-SC and sets up a plurality of clients that good MBMS context sends the data to these data of reception.

Said server according to the attribute of current business or/and configuration, perhaps according to current business participant's distribution situation or/and present position information confirms that can use MBMS to carry transmits data.

When the said MBMS of foundation context request message by server when BM-SC sends, then BM-SC triggers client through SGSN and GGSN functional entity in the GPRS network according to setting up the contextual solicited message of MBMS, BM-SC sets up the MBMS context.

When the said MBMS of foundation context request message by server when client is sent, then client is according to setting up the contextual solicited message of MBMS through SGSN and GGSN functional entity in the GPRS network, BM-SC sets up the MBMS context.

After setting up the MBMS context between client and the BM-SC, BM-SC accomplishes to confirm that the MBMS context is set up to server echo reply message.

After setting up the MBMS context between client and the BM-SC, user end to server echo reply message is accomplished to confirm that the MBMS context is set up.This response message carries the identification information of indication current business and has set up the identification information that MBMS carries with being used to identify, and these two kinds of identification informations are used for the session association that server will be set up good MBMS context and carry out on it.

Compared with prior art; Because the present invention's method and system can be in the data transmission progress that carries out the IMS service conversation; Set up the MBMS carrying mechanism earlier,, then set up the MBMS context request message when confirming that through server current business can use MBMS to carry and transmit data; Set up the MBMS context request message according to this, client and BM-SC set up the MBMS context, and then server is issued BM-SC with data, use the MBMS context of above-mentioned foundation to send the data to a plurality of clients that receive these data by BM-SC.Can know by foregoing description, carry, can directly use when needed owing to set up MBMS earlier; Need not rebulid MBMS mechanism, wait for that MBMS carries the time of setting up so can effectively save, and when not satisfying the multicast requirement; Can also switch receipt at any time and broadcast carrying; Therefore, when the present invention's technical scheme is introduced MBMS mechanism realization transfer of data in the transmission course of IMS service conversation, can effectively reduce the time that session is set up.

Description of drawings

Fig. 1 is the wireless network architecture sketch map of the support broadcasting/packet service of prior art.

Fig. 2 is the operation flow sketch map of the MSMS multicast pattern of prior art.

Fig. 3 is the operation flow sketch map of the MSMS broadcast mode of prior art.

The sketch map of the pattern that Fig. 4 carries out for the business of the PoC of prior art.

The structured flowchart of the corresponding network framework of the pattern that Fig. 5 carries out for the business of the PoC of prior art.

Fig. 6 is the schematic flow sheet that the use MBMS mechanism of prior art realizes PoC service.

Fig. 7 is the IMS vocational work flow process sketch map based on MBMS mechanism of the present invention's preferable first execution mode.

Fig. 8 is the IMS vocational work flow process sketch map based on MBMS mechanism of the present invention's preferable second execution mode.

Embodiment

For making the object of the invention, technical scheme and advantage clearer,, the present invention is done further explain below in conjunction with embodiment and accompanying drawing.

The technology of information sending and receiving in the MBMS business provided by the invention is applicable to the various wireless access ways of use such as WCDMA, CDMA2000, WLAN, UTRA TDD and TD-SCDMA and the communication system of line access mode is arranged.

Main process of the present invention is: when an IMS session begins to set up, in order to shorten settling time, can carry out the mode of setting up of existing IMS session, consult the medium control protocol of use, and begin the transmission of data in due course.Carry out in the process in the IMS session; In the process with mode of unicast transmission data, setting up MBMS carries; When server confirms that current business satisfy to be used MBMS mechanism as the condition of transmission bearer, such as the strategy of formulating according to operator or/and user terminal signatory, or/and professional participant's distribution situation etc. at that time; Initiate the contextual process of setting up of MBMS; After completion set up in this MBMS context, server switched to the data of subsequent transmission in the MBMS session of having set up from present mode of unicast, carried the transmission of carrying out downlink data through this MBMS.

The present invention's technical scheme is applicable to the system that realizes the IMS service application based on MBMS mechanism, and is professional such as POC, conference convention business, DTV, multimedia networking recreation etc.These are used generally all is to be limited to the MultiParty Service that carries out in the group, therefore the demand that identical data need send to a plurality of users in the group can occur, therefore can use MBMS mechanism to realize the transfer of data of carrying aspect.

But convenience for narration; The present invention's preferred embodiments is that example describes with the PoC service; And processing procedure of the present invention can be applied in all a plurality of PoC clients that are positioned at the recipient, but convenient for describing, following preferred embodiments is all to describe a PoC client.

The workflow diagram of preferable first execution mode of the present invention is as shown in Figure 7; A kind of transmission system based on the machine-processed PoC service of MBMS mainly comprises PoC customer end A 21, GPRS node 22, broadcasting/packet service server B M-SC23, PoC PF (Participating Function) server 24, PoC CF (Controlling Function) server 25; Wherein, PoC PF server 24 is carried out the function of participating in PoC session; PoC CF server 25 is carried out the function of the whole PoC session of control, and PoC PF server 24 possibly be same PoC server or different PoC servers with PoC CF server 25, but the convenience for describing; In this preferred embodiments PoC PF server 24 is divided into different PoC servers with PoC CF server 25, then the workflow of this system mainly comprises the steps.

Step 201 is accomplished the process of setting up of PoC session through the SIP signaling between PoC customer end A 21 and the PoC CF server 25;

Step 202, PoC CF server 25 are sent Receiving Talk Burst message and are given PoC PF server 24;

PoC customer end A 21 and the PoC CF server of carrying out the whole PoC session function of control 25 accomplish PoC session set up process after; PoC CF server 25 sends Receiving Talk Burst message and gives PoC PF server 24, the sign of wherein carrying the current speaking user terminal.

Step 203, PoC PF server 24 sends to PoC customer end A 21 with Receiving Talk Burst message;

The Receiving Talk Burst message that PoC PF server 24 sends according to the PoC CF server that is received 25; Revise the IP address and the port numbers of this Receiving Talk Burst message; And Receiving Talk Burst message being sent to PoC customer end A 21 according to amended IP address and port numbers, PoC customer end A 21 is shown to user A with sender's sign.

Step 204, PoC CF server 25 transmits the RTP media data packet and gives PoC PF server 24;

Step 205, PoC PF server 24 are received the RTP media data packet and are passed to PoC customer end A 21;

PoC PF server 24 is received the RTP media data packet and is revised the IP address and the port numbers of this RTP media data packet; And said RTP media data packet being sent to PoC customer end A 21 with the mode of mode of unicast such as point-to-point PTP (Point To Point) according to amended IP address and port numbers, PoC customer end A 21 is shown to user A with media content.

In the said process, be the clean culture process of the point-to-point PTP mode of media data, media data transmits through PDP Context on the GPRS22 bearer network, and in the process of mode of unicast transmission data, sets up MBMS and carry.

Step 206, the MBMS context is set up in request;

According to the attribute of the current PoC service that carries out or/and configuration; Or/and according to current PoC service participant's distribution situation or/and present position information; PoC PF server 24 judges that this PoC service can use MBMS to carry media data; Then set up the contextual MBMS of foundation context request message of MBMS to the BM-SC23 request of sending; Wherein this sets up the identification information that the MBMS context request message carries the current PoC service of indication, and this service identification information can be exactly an ip multicast address.

Step 207, PoC customer end A 21 is set up process with the MBMS context of BM-SC23;

BM-SC23 sets up the contextual request message of MBMS according to the request that PoC PF server 24 sends; Trigger PoC customer end A 21 through SGSN and GGSN functional entity in the GPRS network 22; Set up the MBMS context with BM-SC23; The MBMS context set up in the process confirm following one of at least: the ip multicast address of using the contextual PoC service of this MBMS to use; Interim horde group id TMGI (Temporary Mobile Group Identity), this MBMS loaded service the QOS ability that can use etc.

Step 208 is confirmed MBMS context foundation completion;

After the MBMS context was set up and accomplished, BM-SC23 echo reply message accomplished for PoC PF server 24 to confirm that the MBMS context is set up; Wherein, This response message carries the identification information of the current PoC service of indication and has set up the identification information that MBMS carries with being used to identify, and these two kinds of identification informations are used for PoC PF server 24 and can associate setting up good MBMS context and the PoC session that carries out on it.

Step 209 to step 211; When new media data is passed to PoC PF server 24 from PoC CF server 25; PoC PF server 24 just sends to BM-SC23 with this media data, is used by BM-SC23 and sets up a plurality of PoC clients that good MBMS context sends to this media data this media data of reception.

Wherein, Interface between BM-SC23 and the PoC PF server 24 can use DIAMTER agreement, aaa protocol or COPS agreement to wait and realize that PoC PF server 24 indication BM-SC23 trigger the function that the MBMS context is set up, and also can realize through revising existing protocol message or increasing new protocol message.

If the situation of the client of this PoC service changes; Withdraw from this PoC service such as part PoC client, perhaps the residing position of PoC client changes, and perhaps the network condition of bearer network changes; Cause to continue to use MBMS mechanism; Then PoC PF server 24 can be according to these situation, and the mode of unicast transmission of media data is reused in decision, and between two kinds of transmission mechanisms, switches.If Internet resources can be kept the carrying of clean culture and multicast mode transmission of media data simultaneously, then PoCPF server 24 can directly be handled in this locality, supports same business data flow between two different carryings, alternately to transmit; If the connection of a transmission bearer can only be supported to keep simultaneously in network or terminal, then PoC PF server 24 can be set up new transmission bearer through the mode of similar step 206～208, and then the data of accomplishing between the different bearer are switched.

The above-mentioned course of work that is merely preferable first execution mode of the present invention, but the present invention originally is not limited to this, also can comprise multiple implementation, preferable second execution mode that is described below.

As shown in Figure 8; Workflow diagram for preferable second execution mode of the present invention; A kind of IMS traffic transmission system based on MBMS mechanism mainly comprises PoC customer end A 31, GPRS node 32, broadcasting/packet service server B M-SC33, PoC PF server 34, PoC CF server 35; Wherein, PoCPF server 34 is carried out the function of participating in PoC session, and PoC CF server 35 is carried out the function of the whole PoC session of control; PoC PF server 34 possibly be same PoC server or different PoC servers with PoC CF server 35; But the convenience for describing is divided into different PoC servers with PoC PF server 34 and PoC CF server 35 in this preferred embodiments, and then the workflow of this system mainly comprises the steps.

The step 301 of second execution mode to step 305 is similar with step 201 to the step 205 of first execution mode, and is specific as follows said.

Step 301 is accomplished the process of setting up of PoC session through the SIP signaling between PoC customer end A 31 and the PoC CF server 35;

Step 302, PoC CF server 35 are sent Receiving Talk Burst message and are given PoC PF server 34;

PoC customer end A 31 and the PoC CF server of carrying out the whole PoC session function of control 35 accomplish PoC session set up process after; PoC CF server 35 sends Receiving Talk Burst message and gives PoC PF server 34, the sign of wherein carrying the current speaking user terminal.

Step 303, PoC PF server 34 sends to PoC customer end A 31 with Receiving Talk Burst message;

The Receiving Talk Burst message that PoC PF server 34 sends according to the PoC CF server that is received 35; Revise the IP address and the port numbers of this Receiving Talk Burst message; And Receiving Talk Burst message being sent to PoC customer end A 31 according to amended IP address and port numbers, PoC customer end A 31 is shown to user A with sender's sign.

Step 304, PoC CF server 35 transmits the RTP media data packet and gives PoC PF server 34;

Step 305, PoC PF server 34 are received the RTP media data packet and are passed to PoC customer end A 31;

PoC PF server 34 is received the RTP media data packet and is revised the IP address and the port numbers of this RTP media data packet; And said RTP media data packet being sent to PoC customer end A 31 according to amended IP address and port numbers, PoC customer end A 31 is shown to user A with media content.

In the said process, be the clean culture process of the point-to-point PTP mode of media data, media data transmits through PDP Context on the GPRS32 bearer network, and in the process of mode of unicast transmission data, sets up MBMS and carry.

Step 306, the MBMS context is set up in request;

According to the attribute of the current PoC service that carries out or/and configuration; Or/and according to current PoC service participant's distribution situation or/and present position information; PoC PF server 34 judges that this PoC service can use MBMS to carry media data; Then set up the contextual MBMS of foundation context request message of MBMS to 31 requests of sending of PoC customer end A; Wherein this sets up the identification information that the MBMS context request message carries the current PoC service of indication, and this service identification information can be exactly an ip multicast address.

Step 307, PoC customer end A 31 is set up process with the MBMS context of BM-SC33;

PoC customer end A 31 is through SGSN and GGSN functional entity in the GPRS network 32; Set up the MBMS context with BM-SC; The MBMS context set up in the process confirm following one of at least: the ip multicast address of using the contextual PoC service of this MBMS to use; Interim horde group id TMGI (Temporary Mobile Group Identity), this MBMS loaded service the QOS ability that can use etc.

Step 308 is confirmed MBMS context foundation completion;

After the MBMS context was set up and accomplished, PoC customer end A 31 was accomplished to confirm that the MBMS context is set up to PoC PF server 34 echo reply message; Wherein this response message carries the identification information of the current PoC service of indication and is used to identify and set up the identification information that MBMS carries, and these two kinds of identification informations are used for PoC PF server 34 and can associate setting up good MBMS context and the PoC session that carries out on it.

Step 309 to step 311; As new media data from PoC CF server 35 is passed to PoC PF server 34 when time; PoC PF server 34 sends to BM-SC33 with media data, is used by BM-SC33 and sets up good MBMS context and media data is sent to a plurality of PoC clients that receive this media data.

Wherein, Ask to set up the contextual process of MBMS between PoC PF server 34 and the PoC customer end A 31 and can pass through Session Initiation Protocol, short message mechanism, wap protocol; Various protocols such as http protocol realize; Such as through sending SIP UPDATE message, wherein revise the downstream IP address that media delivery uses and indicate the PoC client to set up a MBMS context as the ip multicast address, perhaps send the carrying that a SMS message indicates the PoC client to set up newtype.

If the situation of the client of this PoC service changes; Withdraw from this PoC service such as part PoC client, perhaps the residing position of PoC client changes, and perhaps the network condition of bearer network changes; Cause to continue to use MBMS mechanism; Then PoC PF server 34 can be according to these situation, and the mode of unicast transmission of media data is reused in decision, and between two kinds of transmission mechanisms, switches.If Internet resources can be kept the carrying of clean culture and multicast mode transmission of media data simultaneously, then PoCPF server 34 can directly be handled in this locality, supports same business data flow between two different carryings, alternately to transmit; If the connection of a transmission bearer can only be supported to keep simultaneously in network or terminal, then PoC PF server 34 can be set up new transmission bearer through the mode of similar step 306～308, and then the data of accomplishing between the different bearer are switched.

Above-mentioned two preferred embodiments are that the situation of TBCP is illustrated to the medium control protocol just, but in fact this technical scheme of the present invention can be applied to all medium control protocols, like MBCP and follow-up other medium control protocols that will occur.

In sum, the present invention's technical scheme is set up the MBMS carrying mechanism earlier in the transmission course of IMS service conversation; Can directly use when needed, and not need MBMS carrying mechanism again, wait for that MBMS carries the time of setting up so can effectively save; And when not satisfying the multicast requirement; Can also switch receipt at any time and broadcast carrying, therefore, the present invention's technical scheme can effectively reduce the time that session is set up.

But above-mentionedly be merely preferred embodiments of the present invention; Be not to be used to limit protection scope of the present invention; Any technical staff who is familiar with the present technique field will be appreciated that; All within spirit of the present invention and principle scope, any modification of being done, equivalence replacement, improvement etc. all should be included within the rights protection scope of the present invention.

Claims

1. internet protocol multi-media system (IMS) the traffic transmission method based on multimedia broadcast multi-broadcasting business (MBMS) mechanism is characterized in that, comprising:

Steps A; According to the attribute of current business or/and configuration; Perhaps according to current business participant's distribution situation or/and present position information, when server confirms that current business can be used MBMS to carry to transmit data, send and set up the MBMS context request message;

Step B sets up the MBMS context between client and the broadcasting multicast service server (BM-SC), and server is issued BM-SC with data, uses the MBMS context of above-mentioned foundation more said data to be sent to a plurality of clients by BM-SC.

2. a kind of IMS traffic transmission method based on MBMS mechanism as claimed in claim 1 is characterized in that, server sends to client or to BM-SC and sets up the MBMS context request message in the steps A.

3. a kind of IMS traffic transmission method based on MBMS mechanism as claimed in claim 1 is characterized in that, said server comprises carries out PF server of participating in session and the CF server of controlling session.

4. a kind of IMS traffic transmission method based on MBMS mechanism as claimed in claim 1 is characterized in that, said server has simultaneously carries out the function of participating in session and control session.

5. a kind of IMS traffic transmission method based on MBMS mechanism as claimed in claim 1 is characterized in that the described MBMS of foundation context request message carries the identification information of indication current business.

6. a kind of IMS traffic transmission method based on MBMS mechanism as claimed in claim 5 is characterized in that this identification information is an ip multicast address.

7. a kind of IMS traffic transmission method as claimed in claim 2 based on MBMS mechanism; It is characterized in that; In the steps A; When server sends when setting up the MBMS context request message to BM-SC; Then the MBMS context procedures of setting up between client and the BM-SC of step B is specially: BM-SC triggers client through service universal grouping wireless service technology support node (SGSN) and gateway general packet radio service technical support node (GGSN) functional entity in general packet radio service technology (GPRS) network according to setting up the contextual solicited message of MBMS, and BM-SC sets up the MBMS context.

8. a kind of IMS traffic transmission method as claimed in claim 2 based on MBMS mechanism; It is characterized in that; In the steps A; When server sends when setting up the MBMS context request message to client; Then the MBMS context procedures of setting up between client and the BM-SC of step B is specially: client is according to setting up the contextual solicited message of MBMS through service universal grouping wireless service technology support node (SGSN) and gateway general packet radio service technical support node (GGSN) functional entity in general packet radio service technology (GPRS) network, and BM-SC sets up the MBMS context.

9. like claim 7 or 8 described a kind of IMS traffic transmission methods based on MBMS mechanism; It is characterized in that, MBMS contextual set up in the process confirm following one of at least: use the contextual professional ip multicast address of using of this MBMS, interim horde group id (TMGI), the employed service quality of this MBMS loaded service (QOS) ability.

10. a kind of IMS traffic transmission method as claimed in claim 7 based on MBMS mechanism; It is characterized in that; Step B comprises further that behind the MBMS context of setting up between client and the BM-SC BM-SC accomplishes to confirm that the MBMS context is set up to server echo reply message.

11. a kind of IMS traffic transmission method as claimed in claim 8 based on MBMS mechanism; It is characterized in that; Step B comprises further that behind the MBMS context of setting up between client and the BM-SC user end to server echo reply message is accomplished to confirm that the MBMS context is set up.

12. like claim 10 or 11 described a kind of IMS traffic transmission methods based on MBMS mechanism; It is characterized in that; This response message carries the identification information and the identification information that is used to identify the MBMS carrying of having set up of indication current business, and these two kinds of identification informations are used for the session association that server will be set up good MBMS context and carry out on it.

13. a kind of IMS traffic transmission method as claimed in claim 3 based on MBMS mechanism; It is characterized in that; Said server is issued BM-SC with data; Using the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC is specially: data are issued the PF server from the CF server, and the PF server sends the data to BM-SC again, are used by BM-SC and set up a plurality of clients that good MBMS context sends the data to these data of reception.

14. a kind of IMS traffic transmission method as claimed in claim 1 based on MBMS mechanism; It is characterized in that; This method further is included in carries out in the MBMS process; When this service conversation condition changes when causing being not suitable for continue using MBMS mechanism, server according to this situation reuse steps A with mode of unicast transmission data.

15. traffic transmission system of internet protocol multi-media system (IMS) based on multimedia broadcast multi-broadcasting business (MBMS) mechanism; This system comprises at least one client, broadcasting multicast service server (BM-SC), server; Carry out the professional transfer of data of IMS between server and the client; It is characterized in that; At the service conversation of setting up between server and the client, server transmits data through mode of unicast and gives after the client, when server according to the attribute of current business or/and configuration; Perhaps according to current business participant's distribution situation or/and present position information when confirming that current business can be used MBMS to carry to transmit data, send and set up the MBMS context request message; Set up the information that comprises in the MBMS context request message according to this, client and BM-SC set up the MBMS context, and then server is issued BM-SC with data, use the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC.

16. a kind of IMS traffic transmission system based on MBMS mechanism as claimed in claim 15 is characterized in that, server sends to client or to BM-SC and sets up the MBMS context request message.

17., it is characterized in that said server comprises carries out PF server of participating in session and the CF server of controlling session like claim 15 or 16 described a kind of IMS traffic transmission systems based on MBMS mechanism.

18., it is characterized in that said server has simultaneously carries out the function of participating in session and control session like claim 15 or 16 described a kind of IMS traffic transmission systems based on MBMS mechanism.

19. a kind of IMS traffic transmission system as claimed in claim 16 based on MBMS mechanism; It is characterized in that; When the said MBMS of foundation context request message by server when BM-SC sends; Then BM-SC triggers client through service universal grouping wireless service technology support node (SGSN) and gateway general packet radio service technical support node (GGSN) functional entity in general packet radio service technology (GPRS) network according to the information of setting up in the MBMS context request message, and BM-SC sets up the MBMS context.

20. a kind of IMS traffic transmission system as claimed in claim 16 based on MBMS mechanism; It is characterized in that; When the said MBMS of foundation context request message by server when client is sent; Then client is according to setting up the contextual solicited message of MBMS through service universal grouping wireless service technology support node (SGSN) and gateway general packet radio service technical support node (GGSN) functional entity in general packet radio service technology (GPRS) network, and BM-SC sets up the MBMS context.

21. a kind of IMS traffic transmission system as claimed in claim 17 based on MBMS mechanism; It is characterized in that; Said server is issued BM-SC with data; Using the MBMS context of above-mentioned foundation to send the data to a plurality of clients by BM-SC is specially: data are issued the PF server from the CF server, and the PF server sends the data to BM-SC again, are used by BM-SC and set up a plurality of clients that good MBMS context sends the data to these data of reception.