CN101043252A - Method and system for transmitting MBMS mechanism based IMS service - Google Patents
Method and system for transmitting MBMS mechanism based IMS service Download PDFInfo
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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
Technical field
The present invention relates to multimedia broadcast/group broadcast service (Multimedia Broadcast Multiple Service, MBMS) technology, be particularly related to the professional transmission technology of a kind 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 by 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) MBMS of proposition mobile communications network, thereby in mobile communications network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, 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 the multicast and the broadcasting of high-speed multimedia business, and this has complied with the trend of following mobile data development undoubtedly.
Fig. 1 is for supporting the wireless network architecture schematic diagram 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 by 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 by 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 universal mobile telecommunications system (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 by the Uu interface then, SGSN also can strengthen wireless access network (GERAN) by Iu/Gb interface and global system for mobile communications and link to each other, and GERAN links to each other with UE by Um Interface then.Wherein, GGSN and SGSN belong to the node in the core net in the wireless network (CN, Core Network).
The network configuration that provides from Fig. 1 as can be seen, in order to support the MBMS business, in 3-G (Generation Three mobile communication system), increase mobile network functional entity--broadcast multicast service center, be BM-SC, described BM-SC is content provider's a inlet, be used for authorizing and initiating the MBMS business, and plan transmits the MBMS content to schedule at mobile network.In addition, on user terminal UE (User Equipment), UTRAN, GERAN, functional entitys such as 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 schematic diagram of MSMS multicast pattern, Fig. 3 is the operation flow schematic diagram 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 described.
Signatory process is used for setting up the relation between user and the service supplier, allows the user subscribe to required MBMS service in advance;
Service declaration process is used for promptly notifying user MBMS the relevant information of business 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 data of corresponding MBMS business, 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 transfers data to UE by the bearing resource that session begins to set up in the process, the MBMS business has two kinds of patterns when transmitting between UTRAN and UE: point-to-multipoint (PTM, Point To Multipoint) pattern and point-to-point (PTP, Point To Point) pattern, the PTM pattern sends identical data by MBMS point-to-multipoint service channel (MTCH), all add multicast service or can receive the interested UE of broadcasting service, ptp mode is by 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, do not need to carry out signatory process and user's adition process, and, after conversation end, do not need to 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 to use a kind of structure of standardized opening to realize diversified multimedia application in the mobile network, offers more selection of user and abundanter impression.
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 S-CSCF (serving CSCF), P-CSCF (proxy CSCF) and three logic entities of I-CSCF (inquiry CSCF) again, S-CSCF is the service switching center of IMS, carry 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, finishes 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, as 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, provide the intercommunication with the polytype network, realize 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 and application also can realize with the IMS framework.
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 appears in mobile communication system, press-and-talk based on cellular system) business, described PoC service is OMA (open mobile alliance, the Open Mobile Alliance tissue) Ding Yi the PTT that on packet network, realizes (Push To Talk, press-and-talk) business, wherein, described PTT business is a kind of semiduplex communication technology.
The mobile communication system 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, according to the OMA definition as can be known, the pattern that the business of PoC is carried out mainly comprises following process as shown in Figure 4:
(1) user with PoC capable terminal at first needs with the supplier of PoC service signatoryly, obtains the PoC service permission;
(2) PoC user finds that by terminal network possesses the PoC service ability;
(3) PoC user has set up contact with other PoC user terminals by PoC service supplier;
(4) PoC user can request to make a speech by button, realizes professional.
The network frame structure of corresponding PoC 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. as shown in Figure 5.
Can see existing P oC be with PoC based on the SIP Core, utilize the ability of SIP Core to realize the route between the user and 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, use such as the IMS that is positioned on the application server for, send identical multi-medium data if desired to one group of IMS user, the broadcast multi-broadcasting ability that so just can utilize the bottom bearer network to provide, use 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, as PoC service, and conference convention business, Digital Television, 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 mainly comprise the steps as shown in Figure 6.
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, by 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 wishes to use the address of the up-downgoing of MBMS mechanism such as being used to refer to customer end B about the PoC server;
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 sends 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 sends, the indication customer end A also adds the multicast carrying in this 200OK response message, and this indication is to realize by the multicast address of unicast address that carries up usefulness and descending usefulness;
Step 106, customer end A add the multicast carrying, carry out MBMS activation, promptly carry out the context of MBMS and set 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 by multicast conversation;
If customer end A or B wish to withdraw from this PoC session, the MBMS context of also wanting deexcitation to set up so simultaneously, i.e. execution in step 110 and step 111 simultaneously.
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, by the INVITE advise called subscriber that sends, at this time the called subscriber just initiates the MBMS session and sets up process, after the foundation of MBMS context is finished, 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 into and use other communication modes, the so long simultaneously use habit that does not also meet user terminal settling time, therefore this mechanism must be improved, otherwise can't carry out practical application.
Summary of the invention
In view of this, the invention provides a kind of transmission method and system of the IMS business based on MBMS mechanism, when introducing MBMS mechanism in the realization of PoC service and realize transfer of data, can effectively reduce the time that session is set up.
A kind of transmission method of the IMS business based on MBMS mechanism, comprising:
Steps A when server judges that current business can be used MBMS to carry to transmit data, is sent and is set up the MBMS context request message;
Step B sets up the MBMS context between client and the BM-SC, and server is issued BM-SC with data, uses the MBMS context of above-mentioned foundation more described data to be sent to a plurality of clients by BM-SC.
Also comprise the service conversation of setting up between server and the client before the described steps A, server transmits data by mode of unicast and gives client;
Server sends to client or to BM-SC and sets up the MBMS context request message in the described 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 and sets up the MBMS context by the SGSN in the GPRS network and GGSN functional entity and BM-SC according to setting up the contextual solicited message of MBMS.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 set up the MBMS context according to setting up the contextual solicited message of MBMS by the SGSN in the GPRS network and GGSN functional entity and BM-SC.
Described 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 judges that can use MBMS to carry transmits data.
Described server comprises carries out PF server that participates in session and the CF server of controlling session.The transmission course of described data 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.
Described server has simultaneously carries out the function that participates 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.
Described MBMS contextual set up in the process determine 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.
Described step B comprises further that behind the MBMS context of setting up between client and the BM-SC BM-SC finishes to confirm that the MBMS context is set up to server echo reply message.
Described 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 finished to confirm that the MBMS context is set up.
Described response message carries the identification information of indication current business and is used to identify the identification information of the MBMS carrying of having set up, and these two kinds of identification informations are used for server will set up good MBMS context and the session association that carries out on it.
Described 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 transmission system of the IMS business 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, when server judges 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 judges 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 by mode of unicast.
Described server sends to client or to BM-SC and sets up the MBMS context request message.
Described server has simultaneously carries out the function that participates in session and control session.Described server can also comprise carries out PF server that participates in session and the CF server of controlling session, then the transmission course of described data 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.
Described 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, judgement can be used MBMS to carry and transmit data.
When the described MBMS of foundation context request message by server when BM-SC sends, then BM-SC triggers client and sets up the MBMS context by the SGSN in the GPRS network and GGSN functional entity and BM-SC according to setting up the contextual solicited message of MBMS.
When the described MBMS of foundation context request message by server when client sends, then client is set up the MBMS context according to setting up the contextual solicited message of MBMS by the SGSN in the GPRS network and GGSN functional entity and BM-SC.
After setting up the MBMS context between client and the BM-SC, BM-SC finishes 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 finished to confirm that the MBMS context is set up.This response message carries the identification information of indication current business and is used to identify the identification information of having set up the MBMS carrying, and these two kinds of identification informations are used for server will set up good MBMS context and the session association that carries 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, transmitted data, then set up the MBMS context request message when using MBMS to carry by server judgement current business; 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.By foregoing description as can be known, owing to set up the MBMS carrying earlier, can directly use when needed, do not need to rebulid MBMS mechanism, thus the time of waiting for that the MBMS carrying is set up can effectively be saved, 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 schematic diagram of the support broadcasting/packet service of prior art.
Fig. 2 is the operation flow schematic diagram of the MSMS multicast pattern of prior art.
Fig. 3 is the operation flow schematic diagram of the MSMS broadcast mode of prior art.
The schematic diagram 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 schematic diagram based on MBMS mechanism of the present invention's preferable first execution mode.
Fig. 8 is the IMS vocational work flow process schematic diagram based on MBMS mechanism of the present invention's preferable second execution mode.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer,, the present invention is described in further detail 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 process, set up the MBMS carrying with mode of unicast transmission data, when server determines 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 distribution situation of professional participant etc. at that time, initiate the contextual process of setting up of MBMS, after this MBMS context foundation is finished, server switches to the data of subsequent transmission in the MBMS session of having set up from present mode of unicast, carry out the transmission of downlink data by this MBMS carrying.
The present invention's technical scheme is applicable to the system that realizes the IMS service application based on MBMS mechanism, such as the POC business, and conference convention business, Digital Television, 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 better embodiment 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 for convenience of description, following better embodiment is all to describe a PoC client.
The workflow diagram of preferable first execution mode of the present invention as shown in Figure 7, a kind of transmission system of the PoC service based on MBMS mechanism 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 that participates in PoC session, PoC CF server 25 is carried out the function of the whole PoC session of control, PoC PF server 24 may be same PoC server or different PoC servers with PoC CF server 25, but be the convenience of describing, in this better embodiment 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 finished the process of setting up of PoC session by the SIP signaling between PoC customer end A 21 and the PoC CF server 25;
Step 202, PoC CF server 25 send Receiving Talk Burst message to PoC PF server 24;
PoC customer end A 21 and the PoC CF server 25 of carrying out the whole PoC session function of control finish PoC session set up process after, PoC CF server 25 sends Receiving Talk Burst message to 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 TalkBurst message that PoC PF server 24 sends according to the PoC CF server 25 that is received, 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;
In the said process, be the clean culture process of the point-to-point PTP mode of media data, media data transmits by PDP Context on the GPRS22 bearer network, and sets up the MBMS carrying in the process of mode of unicast transmission data.
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 send request and set up the contextual MBMS of foundation context request message of MBMS to BM-SC23, 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 by 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 determine 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, affirmation MBMS context is set up and is finished;
After the MBMS context was set up and finished, BM-SC23 echo reply message finished 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 is used to identify the identification information of having set up the MBMS carrying, and these two kinds of identification informations are used for PoCPF server 24 and can associate setting up good MBMS context and the PoC session that carries out on it.
Step 209 is 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 by 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, 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 situations, and the mode of unicast transmission of media data is reused in decision, and switches between two kinds of transmission mechanisms.If Internet resources can be kept the carrying of clean culture and multicast mode transmission of media data simultaneously, then PoC PF server 24 can directly be handled in this locality, supports same business data flow alternately to transmit between two different carryings; If network or terminal can only support to keep simultaneously the connection of a transmission bearer, then PoC PF server 24 can be set up new transmission bearer by the mode of similar step 206～208, and then the data of finishing between the different bearer are switched.
Above-mentionedly only be the course of work of 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 as described below.
As shown in Figure 8, workflow diagram for preferable second execution mode of the present invention, a kind of transmission system of the IMS business 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, PoC PF server 34 is carried out the function that participates in PoC session, PoC CF server 35 is carried out the function of the whole PoC session of control, PoC PF server 34 may be same PoC server or different PoC servers with PoC CF server 35, but be the convenience of describing, in this better embodiment PoC PF server 34 is divided into different PoC servers with PoC CF server 35, then the workflow of this system mainly comprises the steps.
The step 301 of second execution mode is similar to step 205 to the step 201 of first execution mode, specific as follows described to step 305.
Step 301 is finished the process of setting up of PoC session by the SIP signaling between PoC customer end A 31 and the PoC CF server 35;
Step 302, PoC CF server 35 send Receiving Talk Burst message to PoC PF server 34;
PoC customer end A 31 and the PoC CF server 35 of carrying out the whole PoC session function of control finish PoC session set up process after, PoC CF server 35 sends Receiving Talk Burst message to 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 TalkBurst message that PoC PF server 34 sends according to the PoC CF server 35 that is received, 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;
In the said process, be the clean culture process of the point-to-point PTP mode of media data, media data transmits by PDP Context on the GPRS32 bearer network, and sets up the MBMS carrying in the process of mode of unicast transmission data.
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 send request and set up the contextual MBMS of foundation context request message of MBMS to PoC customer end A 31, 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 by 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 determine 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, affirmation MBMS context is set up and is finished;
After the MBMS context was set up and finished, PoC customer end A 31 was finished 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 the identification information of having set up the MBMS carrying, 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 is 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 by 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, 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 situations, and the mode of unicast transmission of media data is reused in decision, and switches between two kinds of transmission mechanisms.If Internet resources can be kept the carrying of clean culture and multicast mode transmission of media data simultaneously, then PoC PF server 34 can directly be handled in this locality, supports same business data flow alternately to transmit between two different carryings; If network or terminal can only support to keep simultaneously the connection of a transmission bearer, then PoC PF server 34 can be set up new transmission bearer by the mode of similar step 306～308, and then the data of finishing between the different bearer are switched.
Above-mentioned two better embodiment are that the situation of TBCP is illustrated at the medium control protocol just, but in fact this technical scheme of the present invention can be applied to all medium control protocols, as MBCP and follow-up other medium control protocols that will occur.
In sum, the present invention's technical scheme is in the transmission course of IMS service conversation, set up the MBMS carrying mechanism earlier, can directly use when needed, and not need MBMS carrying mechanism again, so can effectively save the time of waiting for that the MBMS carrying is set up, 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-mentioned only is better embodiment of the present invention; be not to be used to limit protection scope of the present invention; any those skilled in the art of being familiar with will be appreciated that; all within the spirit and principles in the present invention scope; any modification of being done, equivalence replacement, improvement etc. all should be included within the scope of the present invention.
Claims (27)
1. the transmission method based on the IMS business of MBMS mechanism is characterized in that, comprising:
Steps A when server judges that current business can be used MBMS to carry to transmit data, is sent and is set up the MBMS context request message;
Step B sets up the MBMS context between client and the BM-SC, and server is issued BM-SC with data, uses the MBMS context of above-mentioned foundation more described data to be sent to a plurality of clients by BM-SC.
2. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 1 is characterized in that, also comprises the service conversation of setting up between server and the client before the steps A, and server transmits data by mode of unicast and gives client.
3. the transmission method of a kind of IMS business 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.
4. as the transmission method of claim 1,2 or 3 each described a kind of IMS business based on MBMS mechanism, it is characterized in that, 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 judges that can use MBMS to carry transmits data.
5. as the transmission method of claim 1,2 or 3 each described a kind of IMS business based on MBMS mechanism, it is characterized in that described server comprises carries out the PF server that participates in session and the CF server of control session.
6. as the transmission method of claim 1,2 or 3 each described a kind of IMS business based on MBMS mechanism, it is characterized in that described server has simultaneously carries out the function that participates in session and control session.
7. as the transmission method of claim 1,2 or 3 each described a kind of IMS business based on MBMS mechanism, it is characterized in that the described MBMS of foundation context request message carries the identification information of indication current business.
8. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 7 is characterized in that this identification information is an ip multicast address.
9. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 3, 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 and sets up the MBMS context by the SGSN in the GPRS network and GGSN functional entity and BM-SC according to setting up the contextual solicited message of MBMS.
10. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 3, 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 set up the MBMS context according to setting up the contextual solicited message of MBMS by the SGSN in the GPRS network and GGSN functional entity and BM-SC.
11. transmission method as claim 9 or 10 described a kind of IMS business based on MBMS mechanism, it is characterized in that, MBMS contextual set up in the process determine 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.
12. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 9, 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 finishes to confirm that the MBMS context is set up to server echo reply message.
13. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 10, 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 finished to confirm that the MBMS context is set up.
14. transmission method as claim 12 or 13 described a kind of IMS business based on MBMS mechanism, it is characterized in that, this response message carries the identification information of indication current business and is used to identify the identification information of the MBMS carrying of having set up, and these two kinds of identification informations are used for server will set up good MBMS context and the session association that carries out on it.
15. the transmission method of a kind of IMS business based on MBMS mechanism as claimed in claim 5, it is characterized in that, the transmission course of described data 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.
16. transmission method as claim 1,2 or 3 each described a kind of IMS business 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.
17. transmission system based on the IMS business of MBMS mechanism, this system comprises at least one client, BM-SC, server, carry out the transfer of data of IMS business between server and the client, it is characterized in that, when server judges 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.
18. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 17 is characterized in that, server sends to client or to BM-SC and sets up the MBMS context request message.
19. the transmission system as claim 17 or 18 described a kind of IMS business based on MBMS mechanism is characterized in that, described server comprises carries out the PF server that participates in session and the CF server of control session.
20. the transmission system as claim 17 or 18 described a kind of IMS business based on MBMS mechanism is characterized in that, described server has simultaneously carries out the function that participates in session and control session.
21. transmission system as claim 17 or 18 described a kind of IMS business based on MBMS mechanism, it is characterized in that, 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, judgement can be used MBMS to carry and transmit data.
22. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 18, it is characterized in that, when the described MBMS of foundation context request message by server when BM-SC sends, then BM-SC triggers client according to the information in the MBMS context request message set up and sets up the MBMS context by the SGSN in the GPRS network and GGSN functional entity and BM-SC.
23. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 18, it is characterized in that, when the described MBMS of foundation context request message by server when client sends, then client is set up the MBMS context according to setting up the contextual solicited message of MBMS by the SGSN in the GPRS network and GGSN functional entity and BM-SC.
24. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 22 is characterized in that, after setting up the MBMS context between client and the BM-SC, BM-SC finishes to confirm that the MBMS context is set up to server echo reply message.
25. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 23 is characterized in that, after setting up the MBMS context between client and the BM-SC, user end to server echo reply message is finished to confirm that the MBMS context is set up.
26. transmission system as claim 24 or 25 described a kind of IMS business based on MBMS mechanism, it is characterized in that, this response message carries the identification information of indication current business and is used to identify the identification information of having set up the MBMS carrying, and these two kinds of identification informations are used for server will set up good MBMS context and the session association that carries out on it.
27. the transmission system of a kind of IMS business based on MBMS mechanism as claimed in claim 19, it is characterized in that, the transmission course of described data 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.
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