CN101345845A - Method for implementing video conference service in IMS surroundings - Google Patents
Method for implementing video conference service in IMS surroundings Download PDFInfo
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Abstract
The present invention provides a method for realizing video conference service in the IMS environment, including: a step A: user terminals transmit request messages to an IP Multimedia Subsystem IMS core network, and the IMS core network forwards the request messages to the application server AS triggering business meeting; a step B: AS transmits conference resource application messages to a resource management system RMS, and the RMS appoints a multi-point control unit MCU apparatus for the conference, AS transmits request establishing conference message to the appointed MCU apparatus, the MCU establishes a conference, and returns backs the result to the AS; and a step C: after the MCU successfully creates the conference, the AS transmits the request message of the terminal to the MCU, the request message carries the session description protocol SDP of the user terminal, the MCU and the user terminal performs SDP media negotiation to establish an SIP session. The present invention has enriched the access mode of the user terminal.
Description
Technical field
The present invention relates to a kind of at IP Multimedia System (IP Multimedia Subsystem, abbreviation IMS) method of realization video conference business in the environment, relate in particular to the IMS network, utilize dialogue-based initiation protocol (Session Initialization Protocol, abbreviation SIP) application server (Application Server, be called for short AS) and multipoint control unit (Multipoint Control Unit, be called for short MCU), and resource management system (Resource Manager System is called for short RMS) is realized the method for video conference business.
Background technology
In the IMS environment, by Session Initiation Protocol communication, carry out signaling control between each network element.The IMS core net mainly is responsible for the access of user terminal, and Subscriber Number is done authentication and session control, triggers the operation flow of video conference.AS is the entity of the realization service logic control in the IMS network, can be used for building various multimedia application, realizes miscellaneous service, and video conference is wherein typically a kind of.MCU is the treatment facility of audio-video frequency media, inserts AS by Session Initiation Protocol, realizes the establishment and the various controlled function of meeting.The effect of RMS is resource management and the allotment that realizes a plurality of MCU.
The scheme of existing video conference business based on MCU has very big limitation, can only pass through to build on the AS method of control desk initiates and the control of video meeting, for example operation is initiated and the control of video meeting on webpage, and can not insert and the initiation video conference by user terminal (User Equipment is called for short UE).
Prior art does not provide the solution of following video conference business in the environment based on IMS network and MCU equipment: user terminal is initiatively created the instant video meeting; User terminal is initiatively created the reservation video conference; User terminal invites other user terminals to add video conference; User terminal initiatively adds video conference.
Proposition of the present invention is the above professional implementation of formulating.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that realizes video conference business in the IMS environment, and described method has solved user terminal and created in many ways and add problem based on the video conference of IMS core net and MCU.
A problem to be solved by this invention is that user terminal is initiatively created the instant video meeting based on IMS core net and MCU.In order to solve the problems of the technologies described above, the invention provides a kind of method that in the IMS environment, realizes video conference business, when user terminal is initiatively created the instant video meeting, comprise the steps:
Steps A: user terminal is initiated dialogue-based initiation protocol SIP and is called out, the request message of described terminal is sent to IP Multimedia System IMS core net, the IMS core net triggers convention business with the described request forwards to application server AS, and described request message includes destination address;
Step B:AS is according to the information of carrying in the described request message, send the conferencing resource solicitation message to resource management system RMS, RMS is after multipoint control unit MCU equipment is specified in described meeting, AS sends request to the MCU of described appointment equipment and creates meeting message, MCU creates meeting, and will create the result and return to AS;
After step C:MCU created the meeting success, AS sent the request message of described terminal to described MCU, carried the Session Description Protocol SDP of described user terminal in the described request message, and described MCU and described user terminal carry out the SDP media negotiation, set up the SIP session.
Further, the request message of described user terminal is an INVITE, the destination address of described request message is the access code of convention business, also includes in the described request message with the conference parameters of XML textual description with the conference member list information of XML textual description.
Further, described conference parameters comprises conference type.
Further, described step B comprises the steps:
B1:AS assembles MESSAGE message according to described conference parameters, and sends described MESSAGE message to RMS, carries out the conferencing resource application;
B2:RMS judges whether that enough resources hold described video conference, if having, then RMS is that a MCU equipment is specified in described meeting, and RMS returns to AS with the resource bid result with SIP-MESSAGE message then;
After B3:AS receives the resource bid success message, assemble MESSAGE message, and described MESSAGE message is issued the MCU equipment of described appointment, request is held a meeting.
Further, among the described step C, in 183 message that user terminal was received before the SIP session is set up, the Contact field is the meeting URI that AS generates, and is used for distinguishing different video conferences.
Another problem to be solved by this invention is that user terminal is initiatively created the reservation video conference based on IMS core net and MCU.
In order to solve the problems of the technologies described above, the invention provides a kind of method that in the IMS environment, realizes video conference business, when user terminal is initiatively created the reservation video conference, comprise the steps:
Steps A: user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address
Step B:AS is according to the information of carrying in the described request message, send conferencing resource reservation solicitation message to RMS, RMS is that AS passed through the IMS core net with meeting resource reservation result and is notified to terminal, and finishes this SIP session after MCU equipment was specified in described meeting application;
Step C: after the predetermined the time of meeting arrived, AS sent request to the MCU of described appointment and creates meeting message, and after MCU created the meeting success, AS sent the request INVITE to the terminal that participates in a conference;
Step D: the described terminal that participates in a conference is by IMS and AS, with the SDP media description of this terminal send to described MCU, make this user terminal and MCU carry out the SDP media negotiation, set up the SIP session.
The request message of described user terminal is an INVITE, and the destination address of described request message is the access code of convention business, also includes in the described request message with the conference parameters of XML textual description with the conference member list information of XML textual description.
Further, described step B comprises the steps:
B1:AS assembles MESSAGE message according to described conference parameters, and sends described MESSAGE message to RMS, carries out conferencing resource reservation application;
B2:RMS judges whether that enough resources hold described preset conference, if having, then RMS is that a MCU equipment is specified in described meeting, and RMS returns to AS with the resource reservation application result with SIP-MESSAGE message then;
B3:AS preengages the result with meeting and passes through the IMS core net and be notified to terminal, and finishes this SIP session.
Another problem to be solved by this invention is that user terminal invites other members to add video conference based on IMS core net and MCU.
In order to solve the problems of the technologies described above, the invention provides a kind of method that in the IMS environment, realizes video conference business, when a user terminal invites another user terminal to add video conference, comprise the steps:
Steps A: a user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address;
Step B: carry the Subscriber Number of described another user terminal in the Refer-To field of the message header of described request message, AS initiates INVITE by the IMS core net to described another user terminal according to described request message;
Step C: described another user terminal is by IMS and AS, and this another user terminal SDP is sent to the MCU at a described user terminal place, makes this another user terminal and described MCU carry out the SDP media negotiation, sets up the SIP session.
Further, described request message is relevant REFER message, and destination address is meeting URI.
Further, also include behind the step C, AS sends the notice NOTIFY to a described user terminal, informs that another user terminal has added video conference, and this NOTIFY and described REFER message belong to same SIP session.
Another problem to be solved by this invention is that user terminal initiatively adds video conference based on IMS core net and MCU.
In order to solve the problems of the technologies described above, the invention provides a kind of method that in the IMS environment, realizes video conference business, when user terminal initiatively adds video conference, comprise the steps:
Steps A: user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address;
Step B:AS sends described request message to the MCU at the meeting place that user terminal requests adds, and described request message also carries the SDP media description of described terminal;
Step C: described MCU carries out the SDP media negotiation by AS and IMS and described user terminal, sets up the SIP session.
Further, the request message of described user terminal is an INVITE, and the destination address of described request message is meeting URI, also includes the conference parameters with the XML textual description in the described request message.
Further, described step B comprises the steps: that also AS learns the meeting URI that described user terminal will add from described request message, and from the conference parameters that XML describes, read the meeting password, judge whether password is correct, as correctly, AS sends described INVITE to described MCU, and described INVITE carries described user terminal SDP media description.
Further, described step C comprises the steps:
The SDP media description that C1:MCU carries this MCU with 183 message returns to AS, and AS is given to described user terminal with this 183 message by the IMS core net;
C2: user terminal is by IIMS and AS, send upgrade UPDATE message carry satisfy precondition precondition the SDP media description to MCU, make between this user terminal and this MCU and carry out the SDP media negotiation in the mode of support precondition;
C3:MCU returns the 200OK message at described UPDATE by AS and IIMS, carries the SDP media description that satisfies the precondition condition and gives this user terminal;
C4: this user terminal sends ACK to this MCU by IMS core net and AS, and the SIP session is set up, and user terminal successfully adds video conference.
Beneficial effect of the present invention is, solved that the method that can only pass through to build on the AS control desk in the prior art is initiated and the technology of control of video meeting, the solution that following video conference business is provided in the environment based on IMS network and MCU equipment is provided: user terminal is initiatively created the instant video meeting; User terminal is initiatively created the reservation video conference; User terminal invites other user terminals to add video conference; User terminal initiatively adds video conference, has improved the limitation of prior art, has enriched the user terminal access way.
Description of drawings
Fig. 1 is a network element structure chart of the present invention.
Fig. 2 is the signaling process figure that user terminal of the present invention is initiatively created the instant video meeting.
Fig. 3 is the signaling process figure that user terminal of the present invention is initiatively created the reservation video conference.
Fig. 4 is that user terminal A of the present invention invites user terminal B to add the signaling process figure of video conference.
Fig. 5 is the signaling process figure that user terminal of the present invention initiatively adds video conference.
Embodiment
The objective of the invention is to, the video conference business based on MCU equipment is provided in the IMS network environment, and abundant user terminal access way is provided, that is, by place net territory IMS, create in many ways and add video conference based on MCU by user terminal.Among the present invention, the access way of user terminal comprises: user terminal is created the instant video meeting, creates the reservation video conference, invites other members to add video conference and is initiatively added video conference.
In the technical scheme of the present invention,, as shown in Figure 1, comprise user terminal UE, IMS core net, AS, MCU and RMS based on the video conferencing system of IMS environment.
Described IMS core net is responsible for the access and the professional triggering of user terminal, and described AS is meant the application server of carrying video conference business, and described MCU is a multipoint control unit of being responsible for handling video media, and described RMS is the explorer of MCU.
Wherein, IMS core net, MCU and RMS are connected with AS by Session Initiation Protocol, and user terminal is connected by Session Initiation Protocol with the IMS core net.MCU equipment can have many, carries out resource management and scheduling by RMS indirectly by AS, RMS and not direct communication of MCU.Distinguish with different meeting unified resource identifier (Uniform Resource Identifier is called for short URI) between the different video meeting, this meeting URI is generated by AS.
Below in conjunction with accompanying drawing, describe the implementation method that user terminal is created the instant video meeting, created the reservation video conference, invites other members to add video conference and initiatively add video conference in detail.
When user terminal was initiatively created the instant video meeting, user terminal was initiated INVITE to the IMS core net, forwarded AS to and triggered convention business.AS sends message to RMS earlier and carries out resource bid, has enough resources to hold current video conference if RMS judges, then specifies a MCU equipment for active conference, and AS sends the message that meeting is created in application to the MCU of RMS appointment then.If MCU creates the meeting success, AS initiates INVITE to this MCU, carries user terminal SDP information, makes and carries out the SDP media negotiation between user terminal and the MCU, and the SIP session was set up after media negotiation was finished, and user terminal is created instant video meeting success.
Figure 2 shows that user terminal initiatively creates the implementation method of instant video meeting.Comprise the steps:
When step 1, user terminal were initiatively created the instant video meeting, user terminal was initiated SIP and is called out, and delivers to the IMS core net with INVITE, and the IMS core net is forwarded to AS with INVITE and triggers convention business.
Destination address is the access code of convention business in the INVITE, support the Supported field to indicate in the message header and support precondition precondition, except that message header, also carry three partial contents, be respectively: the Session Description Protocol of user terminal (Session Description Protocol, be called for short SDP) media description, with the conference parameters of XML textual description with the conference member list information of XML textual description.
Described conference parameters comprises conference type, the maximum number of meeting, meeting time span, frame numbers, picture layout, chairman's password, conference member password and conference member list etc.
When user terminal was initiatively created the reservation video conference, user terminal was initiated INVITE to the IMS core net, forwarded AS to and triggered convention business.AS attempts creating video conference according to conference parameters, send SIP-MESSAGE message to RMS earlier and carry out the resource reservation application, RMS judges whether to reserve enough resources and holds this video conference in the time of appointment, if have, then specify a MCU equipment for this meeting, RMS is with resource reservation application result SIP-MESSAGE message acknowledgment AS then.If the resource bid success, AS answers user terminal with 200OK message by the IMS core net, and the expression meeting is successfully preengage, and the SIP session of end user terminal.The preset conference time, then AS sent the SIP-MESSAGE message of creating meeting to the MCU of RMS appointment, and MCU will create meeting result SIP-MESSAGE message acknowledgment AS.If MCU creates the meeting success, AS initiates INVITE and is sent to each user terminal that indicates in member's tabulation, make between user terminal and the MCU and carry out the SDP media negotiation in the mode of supporting precondition, the SIP session was set up after media negotiation was finished, and the reservation video conference is successfully held.In the INVITE that user terminal was received before the SIP session is set up, the From field of message header, P-Asserted-Identity and P-Service-Param field all contain the meeting URI that AS generates, and are used for distinguishing different video conferences.
Be illustrated in figure 3 as user terminal and initiatively create when preengaging video conference, the present invention realizes the method for video conference business, comprises the steps:
Destination address is the access code of convention business in the INVITE, also carries two parts content except that message header, is respectively: with the conference parameters of XML textual description, with the conference member list information of XML textual description.Described conference parameters comprises conference type, the maximum number of meeting, meeting start time, meeting time span, frame numbers, picture layout, chairman's password, conference member password, conference member list etc.
After step 10～11, the predetermined meeting time of holding arrived, the SIP-MESSAGE message of meeting was created in the AS assembling, and described message is mail to the MCU of appointment in the step 4, the request holding video conference.
Step 28 communicates between terminal and the MCU, transmits Media Streams such as audiovideo with the form of SDP media negotiation before.
When user terminal A invites other user terminals B to add video conference, the user terminal A that has added video conference is initiated the Refer message of SIP to the IMS core net, this Refer message can be used an independent SIP session, can be same session perhaps with the SIP session that adds meeting before, the destination Mobile Station International ISDN Number of Refer message is meeting URI, and carries the Subscriber Number of user terminal B in the Refer-To of message header field.The IMS core net with the Refer forwards to AS.AS initiates INVITE and is sent to user terminal B, makes between user terminal B and the MCU to carry out the SDP media negotiation in the mode of supporting precondition, and the SIP session was set up after media negotiation was finished, and user terminal B adds the video conference success.Last AS sends Notify message to user terminal A, and expression user terminal B adds the video conference success.
Figure 4 shows that user terminal UE A invites user terminal UE B to add the implementation method of video conference, this flow process is omitted the step of creating meeting, and concrete steps are as follows:
When user terminal initiatively adds video conference, need the user to know meeting URI in advance.Figure 5 shows that user terminal of the present invention initiatively adds the implementation method of video conference, this flow process is omitted the step of creating meeting, this moment, user terminal was not in meeting, but the user has passed through certain approach knows meeting URI, for example can initiate short message or email notification by AS, or indirect informing by other users.
The present invention has improved in the prior art method that can only pass through to build on the AS control desk based on the scheme of the video conference business of MCU and has initiated and the control of video meeting, and can not insert and the limitation of initiation video conference by user terminal, provide prior art in the environment based on IMS network and MCU equipment, the solution of unexistent following video conference business: user terminal is initiatively created the instant video meeting; User terminal is initiatively created the reservation video conference; User terminal invites other user terminals to add video conference; User terminal initiatively adds video conference, gives from the user terminal access multiple technologies scheme is provided, and has enriched the user terminal access way.
Claims (15)
1, a kind of method that realizes video conference business in the IMS environment when user terminal is initiatively created the instant video meeting, comprises the steps:
Steps A: user terminal is initiated dialogue-based initiation protocol SIP and is called out, the request message of described terminal is sent to IP Multimedia System IMS core net, the IMS core net triggers convention business with the described request forwards to application server AS, and described request message includes destination address;
Step B:AS is according to the information of carrying in the described request message, send the conferencing resource solicitation message to resource management system RMS, RMS is after multipoint control unit MCU equipment is specified in described meeting, AS sends request to the MCU of described appointment equipment and creates meeting message, MCU creates meeting, and will create the result and return to AS;
After step C:MCU created the meeting success, AS sent the request message of described terminal to described MCU, carried the Session Description Protocol SDP of described user terminal in the described request message, and described MCU and described user terminal carry out the SDP media negotiation, set up the SIP session.
2, the method for claim 1, it is characterized in that, the request message of described user terminal is an INVITE, the destination address of described request message is the access code of convention business, also includes in the described request message with the conference parameters of XML textual description with the conference member list information of XML textual description.
3, method as claimed in claim 2 is characterized in that, described conference parameters comprises conference type.
4, as the arbitrary described method of claim 1 to 3, it is characterized in that described step B comprises the steps:
B1:AS assembles MESSAGE message according to described conference parameters, and sends described MESSAGE message to RMS, carries out the conferencing resource application;
B2:RMS judges whether that enough resources hold described video conference, if having, then RMS is that a MCU equipment is specified in described meeting, and RMS returns to AS with the resource bid result with SIP-MESSAGE message then;
After B3:AS receives the resource bid success message, assemble MESSAGE message, and described MESSAGE message is issued the MCU equipment of described appointment, request is held a meeting.
5, method as claimed in claim 4 is characterized in that, among the described step C, in 183 message that user terminal was received before the SIP session is set up, contact Contact field is the meeting URI that AS generates, and is used for distinguishing different video conferences.
6, a kind of method that realizes video conference business in the IMS environment when user terminal is initiatively created the reservation video conference, comprises the steps:
Steps A: user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address
Step B:AS is according to the information of carrying in the described request message, send conferencing resource reservation solicitation message to RMS, RMS is that AS passed through the IMS core net with meeting resource reservation result and is notified to terminal, and finishes this SIP session after MCU equipment was specified in described meeting application;
Step C: after the predetermined the time of meeting arrived, AS sent request to the MCU of described appointment and creates meeting message, and after MCU created the meeting success, AS sent the request INVITE to the terminal that participates in a conference;
Step D: the described terminal that participates in a conference is by IMS and AS, with the SDP media description of this terminal send to described MCU, make this user terminal and MCU carry out the SDP media negotiation, set up the SIP session.
7, method as claimed in claim 6, it is characterized in that, the request message of described user terminal is an INVITE, the destination address of described request message is the access code of convention business, also includes in the described request message with the conference parameters of XML textual description with the conference member list information of XML textual description.
8, method as claimed in claim 7 is characterized in that, described step B comprises the steps:
B1:AS assembles MESSAGE message according to described conference parameters, and sends described MESSAGE message to RMS, carries out conferencing resource reservation application;
B2:RMS judges whether that enough resources hold described preset conference, if having, then RMS is that a MCU equipment is specified in described meeting, and RMS returns to AS with the resource reservation application result with SIP-MESSAGE message then;
B3:AS preengages the result with meeting and passes through the IMS core net and be notified to terminal, and finishes this SIP session.
9, a kind of method that realizes video conference business in the IMS environment when one user terminal invites another user terminal to add video conference, comprises the steps:
Steps A: a user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address;
Step B: carry the described Subscriber Number of user terminal in addition in the Refer-To field of the message header of described request message, AS initiates INVITE by the IMS core net to described another user terminal according to described request message;
Step C: described another user terminal is by IMS and AS, and this another user terminal SDP is sent to the MCU at a described user terminal place, makes this another user terminal and described MCU carry out the SDP media negotiation, sets up the SIP session.
10, method as claimed in claim 9 is characterized in that, described request message is relevant REFER message, and destination address is meeting URI.
11, method as claimed in claim 10, it is characterized in that, also include behind the step C that AS sends the notice NOTIFY to a described user terminal, inform that another user terminal has added video conference, this NOTIFY and described REFER message belong to same SIP session.
12, a kind of method that realizes video conference business in the IMS environment when user terminal initiatively adds video conference, comprises the steps:
Steps A: user terminal is initiated SIP and is called out, and the request message of described terminal is sent to the IMS core net, and the IMS core net triggers convention business with the described request forwards to AS, and described request message includes destination address;
Step B:AS sends described request message to the MCU at the meeting place that user terminal requests adds, and described request message also carries the SDP media description of described terminal;
Step C: described MCU carries out the SDP media negotiation by AS and IMS and described user terminal, sets up the SIP session.
13, method as claimed in claim 12 is characterized in that, the request message of described user terminal is an INVITE, and the destination address of described request message is meeting URI, also includes the conference parameters with the XML textual description in the described request message.
14, method as claimed in claim 13, it is characterized in that, described step B comprises the steps: that also AS learns the meeting URI that described user terminal will add from described request message, and from the conference parameters that XML describes, read the meeting password, judge whether password is correct, as correctly, AS sends described INVITE to described MCU, and described INVITE carries described user terminal SDP media description.
15, method as claimed in claim 14 is characterized in that, described step C comprises the steps:
The SDP media description that C1:MCU carries this MCU with 183 message returns to AS, and AS is given to described user terminal with this 183 message by the IMS core net;
C2: user terminal is by IIMS and AS, send upgrade UPDATE message carry satisfy precondition precondition the SDP media description to MCU, make between this user terminal and this MCU and carry out the SDP media negotiation in the mode of support precondition;
C3:MCU returns the 200OK message at described UPDATE by AS and IIMS, carries the SDP media description that satisfies the precondition condition and gives this user terminal;
C4: this user terminal sends ACK to this MCU by IMS core net and AS, and the SIP session is set up, and user terminal successfully adds video conference.
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