WO2007076637A1

WO2007076637A1 - Method for making use of h239 presentation tokens in multi-stage cascade video conference system

Info

Publication number: WO2007076637A1
Application number: PCT/CN2005/002437
Authority: WO
Inventors: Zheng Ma; Jinghai Chen; Ziming Jin
Original assignee: Zte Corporation
Priority date: 2005-12-31
Filing date: 2005-12-31
Publication date: 2007-07-12

Abstract

A method for making use of H239 presentation tokens in a multi-stage cascade video conference system performed in three or more cascades lower multi-point control unit includes steps as follows: there is only one set of H239 presentation tokens in the conference system; when the H239 presentation message is transmitted to the lower stage conference, the multi-point control unit of the lower stage converts the terminal number in the H239 presentation message into the terminal number allocated by the lower stage conference; when the H239 presentation message is transmitted to the higher stage conference, the multi-point control unit of the lower stage converts the terminal number in the H239 presentation message into the terminal number allocated by the higher stage conference; the terminal holding the H239 presentation tokens transmits the video of second channel.

Description

Method for using H239 presentation token in multi-level cascaded conference television system

The present invention relates to the field of conference television, and in particular to a method for how to use a H239 presentation token in a multi-level cascade (three or more cascade) conference television system. Background technique

For information on H239 presentation tokens in the following description, please refer to the Protocol ITU-T H. 239 "Role management and additional media channels for H. 300- series terminals".

In the conference television system, in order to realize hierarchical management of participating terminals and access to more terminals, a multi-level cascaded conference mode is generated. When a multi-level cascade conference is held, the next-level MCU (Multipoint Control Unit) accesses itself as a terminal to the upper-level conference. In this way, in the upper-level conference, the next-level MCU is a terminal, and the MCU of the upper-level conference assigns a unique TerminalLabel (terminal number) as the identifier. In the next-level conference, the MCU of the next-level conference is an MCU, which manages all the terminals in the next-level conference, and assigns a unique TerminalLabel as the identifier to all terminals in the next-level conference, and manages the next-level conference. Terminal list. Therefore, the upper-level meeting and the lower-level meeting each have an independent terminal list, and the MCU in the upper-level meeting and the MCU in the lower-level meeting independently manage their respective meetings.

With the development of technology, people no longer need to pass only one video image in the conference television system. Therefore, there is an application that can transmit the second video image in one conference. The H.239 agreement specifies how to deliver a second, or even more, video image in a conference. In the H.239 protocol, a terminal with a presentation token can send a second video, and other terminals watch a second video of the terminal. In this way, the MCU needs to manage the H239 presentation token.

In a multi-level cascade conference, the H239 presentation token can be used in this way, that is, the upper conference and the lower conference each use the H239 presentation token in the conference, and do not interfere with each other. However, in this mode of use, it is impossible to realize the interworking of the second-party video of the superior meeting and the lower-level meeting. Because the upper and lower conferences look at the other party's second video, they must first apply for the H239 presentation token, but they all have their own independent H239 presentation tokens, so they will never make a token request to the other party. If there is no token, naturally the second video cannot be sent, so that they will not see each other's second video. If you consider using only one H239 presentation token in a multi-level cascade conference, you can implement the interworking of the second video in the multi-level cascade conference. However, because both the superior and the lower-level conferences have their own independent terminal lists, there is no terminal list of the other party, and in the H239 presentation token management related message, the terminal itself needs to be delivered.

1 Confirmation TermirialLabel. When the H239 presentation message is passed between the upper and lower conferences, the TerminalLabel in the message will be confused, and it is not clear which terminal is in the conference. Therefore, the prior art cannot implement interworking of more channels of video in a multi-level cascade conference, and the prior art needs to be improved and developed. Summary of the invention

It is an object of the present invention to provide a method for using a H239 presentation token in a multi-stage cascaded conference television system. Only one set of H239 presentation tokens is used in the entire conference, and the terminal having the token transmits the second video, and the other The terminal receives, so as to realize the interworking of the second video in the multi-level cascade conference; in the process of the H239 presentation token-related message, the MCU (hereinafter referred to as the lower-level MCU) on the conference hierarchical node assumes the role conversion task, and uses To solve the confusion of the TerminalLabel in the message.

The technical solution of the present invention includes:

A method for using a H239 presentation token in a multi-stage cascaded conference television system, which is executed on a lower-level multi-point control unit of three or more cascades, wherein the conference has only one set of H239 presentation tokens. When the H239 presentation message is sent to the next-level conference, the lower-level multipoint control unit changes the terminal number value in the H239 presentation message to the terminal number assigned to the lower-level conference. When the H239 presentation message is sent to the upper-level conference, the lower-level multipoint control unit Change the terminal number value in the H239 presentation message to the terminal number assigned to it by the upper-level conference, and the terminal holding the H239 presentation token to send the second-channel video.

The method further includes the following steps:

A. When receiving the H239 presentation message sent by the superior conference, the lower-level multipoint control unit processes itself as a terminal of the superior conference;

B. When receiving the H239 presentation message sent by the terminal in the conference, the lower multipoint control unit treats itself as the multipoint control unit of the conference.

The method, wherein, further includes -

A1. If the holding terminal of the H239 presentation token is a cascade port that is cascaded with the upper-level conference, the current terminal variable is equal to the terminal number assigned by the upper-level subordinate;

B1. If the holding terminal of the H239 presentation token is a specific terminal in the lower-level conference, the terminal variable currently held is the terminal number of the specific terminal.

The method further includes the steps of:

E. When the H239 presentation token in the current conference is the cascade port that is cascaded with the upper-level conference, when the lower-level multipoint control unit receives the request message from the terminal in the conference, save the terminal number value in the request message. In the current application terminal variable; F. After converting the terminal number in the request message to the terminal number assigned by the upper level to the lower level, the terminal number is forwarded to the multi-point control unit of the upper-level conference.

The method further includes:

G. If the H239 presentation token in the current conference is on the terminal in the lower conference, and the request message is received from the cascade interface that is cascaded with the upper conference, the lower multipoint control unit directly returns the agreed response message to the superior. The cascading port of the conference, while forcibly depriving the H239 demo token of the H239 presentation token holding terminal in this conference.

The method further includes:

G2. If the H239 presentation token in the current conference is on the terminal in the lower conference, and receives the request message from the cascade interface that is cascaded with the upper conference, the terminal number value in the request message is saved in the current application terminal variable. After converting the terminal number in the message to the terminal number assigned by the superior to the lower level, the terminal number is forwarded to the terminal holding the token, and the terminal decides whether to agree to release the H239 presentation token.

The method further includes:

H. When the H239 presentation token in the current conference is cascaded with the upper conference, the lower multipoint control unit receives the response message from the cascade interface that is cascaded with the upper conference.

I. If the terminal number in the response message is equal to the terminal number assigned by the upper level to the lower level, and the current application terminal variable is greater than 0, the terminal number in the message is converted into the current application terminal variable, and the terminal is in the current conference. The number is equal to the terminal that is currently applying the terminal variable for forwarding.

The method further includes:

When the H239 presentation token in the conference is cascaded with the upper conference, the lower multipoint control unit receives the release message or the indication message from the cascade interface that is cascaded with the upper conference, and the release message or After the terminal number in the indication message is converted to the terminal number assigned by the upper level, the terminal number is forwarded to each participant terminal in the conference.

The method, wherein, further includes -

K. When the Η 239 demo token in the conference is on the terminal of the subordinate conference, the subordinate multipoint control unit receives the release message from the 令牌 239 demo token holding terminal, and forwards it to the cascading port cascaded with the upper conference. The terminal number in the message is converted to the terminal number assigned to the lower level and then forwarded. When forwarding to other participating terminals in the conference, the terminal number does not need to be converted and can be directly forwarded.

The invention provides a method for using the Η239 demo token in a multi-level cascade conference television system. When a multi-level cascade conference is held, only one set of 239 demo tokens needs to be managed in the entire conference, and the whole The broadcast source of the second video of the conference is also unique, so there is no problem that the broadcast source of the second video in the entire conference is not uniform. DRAWINGS

Figure 1 is a block diagram of a specific embodiment of the method of the present invention;

2 is a flow chart of processing a received PresentationTokenRequest message by a lower-level MCU in the present invention;

3 is a flow chart of processing a received PresentationTokenResponse message by a lower-level MCU in the present invention;

4 is a PresentationTokenRelease and a received message received by a subordinate MCU in the present invention.

Presentat i onTokenOwner Indi cat i on message flow chart. detailed description

The specific embodiments of the method of the present invention will be further described below in conjunction with the accompanying drawings, and a three-level cascade conference is taken as an example.

The H239 presentation token related method in the multi-level cascade conference of the present invention is as follows: in a multi-level cascade conference, only one set of H239 presentation tokens is provided, and the terminal having the H239 presentation token can send the second channel video. The lower-level MCU in the multi-level cascade conference assumes the role conversion task during the processing of the H239 presentation token related message, that is, the H239 presentation message, that is, receives the H239 presentation message sent by the upper-level conference, and the lower-level MCU uses itself as a terminal. The processing is performed; the H239 presentation message sent by the terminal in the conference is received, and the lower-level MCU processes itself as the MCU. The lower-level MCU modifies the TerminalLabel value in the message according to the direction in which the H239 presentation message is sent, so that it conforms to the role played by the lower-level MCU in each conference.

The core method of the present invention will be described below. In order to make the method clearer, this method sets the following variables, below

' Description of the variables and messages set:

• TerminalLabelDown is a terminal number variable assigned to the lower level by the superior, and is used to save the TerminalLabel allocated by the MCU of the upper-level conference to the lower-level MCU;

• TerminalLabelUp is a terminal number variable assigned to the upper level to store the TerminalLabel assigned by the lower-level MCU to the upper-level conference MCU.

• TerminalLabelReq—The current application terminal variable is used to store the TerminalLabel of the terminal applying for the H239 demo token in the subordinate conference;

• TerminalLabelPre currently holds the terminal variable, which is used to save the TerminalLabel of the H239 presentation token in the current conference;

· PresentationTokenRequest - request message, H239 presentation token request message;

• PresentationTokenResponse one-to-one response message, H239 presentation token request response message; • PresentationTokenRelease - releases the message, H239 demonstrates the token release message;

• PresentationTokenOwnerlndication - indicates the message, H239 demonstrates the token holder indication message;

In the core algorithm of the present invention, all of the following processing is performed on the lower level MCU:

After the H239 presentation token has been assigned in the conference, the subordinate MCU saves the TerminalLabel of the H239 presentation token terminal in the current conference, that is, TerminalLabelPre. If the holding terminal of the H239 presentation token is the cascade port that is cascaded with the upper-level conference, then TerminalLabelPre=TerminalLabelUp; if the terminal of the H239 presentation token is a specific terminal in the lower-level conference, TerminalLabelPre is The TerminalLabel of the specific terminal. The above operation is a prerequisite for each of the following steps.

The H239 presentation token in the current conference is the cascade port that is cascaded with the upper-level conference. When the lower-level MCU receives the PresentationTokenRequest message from the terminal in the conference, the value of the TerminalLabel in the message is first. After being stored in the TerminalLabelReq, the TerminalLabel in the PresentationTokenRequest message is converted into the TerminalLabelDown (in the present invention by the assignment method, the same below), and forwarded to the upper-level conference MCU. If the H239 presentation token in the current conference is on the terminal in the next conference, and the PresentationTokenRequest message is received from the cascade interface that is cascaded with the upper conference, there are two ways: 1. The lower-level MCU directly returns the agreed PresentationTokenResponse message to At the same time, the H239 presentation token of the H239 presentation token holding terminal in the conference is forcibly deprived. 2. The subordinate MCU will receive the PresentationTokenRequest message and forward the terminal holding the token. The terminal decides whether to agree to release the H239 presentation token.

The H239 presentation token in the current conference is the cascading port that is cascaded with the upper-level conference. The lower-level MCU receives the PresentationTokenResponse message from the cascading interface that is cascaded with the upper-level conference. If the message is in the TerminalLabel = TerminalLabelDown, and there is an H239 demo token applicant at this time (for example, TerminalLabelReq > 0 at the initial value of TerminalLabelReq-O), then the TerminalLabel in the message is converted to TerminalLabelReq, and then to this conference, TerminalLabel = TerminalLabelReq The terminal forwards.

When the H239 presentation token in the conference is on the terminal in the upper-level conference, that is, the cascade port that is cascaded with the upper-level conference, the lower-level MCU receives the PresentationTokenRelease message or the PresidentationTokenOwner Indi cat i from the cascade port that is cascaded with the upper-level conference. On the message, you need to convert the TerminalLabel in the message to the TerminalLabelUp, and then forward it to each participant terminal in the conference. When the H239 presentation token in the conference is on the terminal of the subordinate conference, the subordinate MCU receives the PresentationTokenRelease message from the H239 presentation token holding terminal, and forwards the message to the cascade port of the upper conference concatenation. When TerminalLabel is converted to TerminalLabelDoTO and forwarded to other participating terminals in this conference, there is no need to convert TerminalLabel.

Figure 1 shows a simple primary-third-level cascaded conference television system. In the figure, the primary MCU and the tertiary MCU are respectively MCUs in the cascade conference. The main MCU is the MCU in the main conference, and the third-level MCU. It is the MCU in the three-level conference. In the figure, Τ1, Τ2, Τ3, Τ4 respectively represent four terminals connected to the main MCU and the three-level MCU in the conference, where Tl and Τ2 are connected to the main MCU, and T3 and T4 are connected to the third-level MCU.

The three-level MCU stores two TerminalLabel values, one assigned to the primary MCU and recorded as the Terminal labelDown, and one third-level MCU allocated for the cascade port connected to the primary MCU, which is recorded as the TerminalLab e 1 Up.

FIG. 2 is a flowchart of processing a PresentationTokenRequest message received by a lower-level MCU in the present invention, and still uses a three-level MCU as an example. When the Level 3 MCU receives the H239 PresentationTokenRequest message, it first determines where the H239 token is in the current conference; if the H239 presentation token in the current conference is in the upper conference, that is, TerminalLabelPre=TerminalLabelUp, it is determined whether the message is from Received by the cascade port of the upper-level conference cascade, if not, it is received from the terminal in the conference. In this case, the PermanentLabel in the saved message is in the variable TerminalLabelReq, and the TerminalLabel is re-assigned to the TerminalLabelDown, The cascade port of the upper-level conference cascade.

If the H239 presentation token in the current conference is on the terminal of the conference, TerminalLabelPre! = TerminalLabelUp, and then determine whether the message is received from the cascade port that is cascaded with the upper-level conference. If yes, send the consent PresentationTokenResponse message directly to the cascade port that is cascaded with the upper-level session, and forcefully deprive the H239 presentation in the conference. The token holds the H239 token of the terminal; if not, the message is forwarded directly to the H239 presentation token holding terminal in the conference.

As shown in FIG. 3, a flow chart of processing the received PresentationTokenResponse message by the middle and lower level MCU of the method of the present invention is still described by taking a three-level MCU as an example. When the Level 3 MCU receives the PresentationTokenResponse message, it first determines where the H239 token is in the current conference. If the H239 presentation token in the current conference is in the upper conference, that is, TerfflinalLabelPre=TerminalLabelUp, it is determined whether the message is from the superior and the superior. Received on the cascade port of the conference cascade, if yes, and the message in the message, LabelLabelDown, and whether there is a 239 demo token applicant in the current conference, that is, TerminalLabelReq > 0, then the TerminalLabel is reassigned to the TerminalLabelReq, and then forwarded. Give the terminal of TerminalLabel=TerminalLabelReq in this conference.

As shown in FIG. 4, the lower level MCU of the present invention receives the PresentationTokenRelease and

The flowchart of the processing of the PresentationTokenOwnerlndication message is still described by taking a three-level MCU as an example. First, determine where the H239 token is in the current conference; if the H239 presentation token in the current conference is in the upper conference, that is, TerminalLabelPre=TerminalLabelUp, determine whether the message is received from the cascade port cascaded with the upper conference. If not, the TerminalLabel in the message is reassigned to the TerminalLabelUp and forwarded to all the participants in the third-level conference.

If the H239 presentation token in the current conference is on the terminal of the conference, TerminalLabelPre! =

TerminalLabelUp, and then determine whether the message is received from the cascade port that is cascaded with the upper-level conference. If not, the terminalLabel is re-assigned to TerminalLabelDown, and then the message is forwarded to the cascade port that is cascaded with the superior.

The method for using the H239 presentation token in the multi-level cascade conference television system of the present invention is not interoperable when the second video is implemented by using the presentation token method specified in the H239 protocol in the multi-level cascade conference, and the multi-level In the joint conference, when the H239 presentation token related message is transmitted, the problem arises from the confusion of the TerminalLabel in the message. After the method of the present invention, the multi-level cascade conference only needs to use a set of H239 presentation tokens. The terminal of the token sends the second video, and the other terminal receives, so as to realize the interworking of the second video in the multi-level cascade conference. During the process of the H239 presentation token-related message, the MCU (hereinafter referred to as the lower-level MCU) on the conference grading node assumes the role conversion task, which solves the confusion of the TerminalLabel in the message.

It is to be understood that the foregoing description of the specific embodiments of the invention is intended to

Claims

Rights request

A method for using a H239 presentation token in a multi-level cascaded conference television system, which is executed on a lower-level multi-point control unit of three or more cascades, wherein the conference has only one set of H239 demonstration commands. When the H239 presentation message is sent to the next-level conference, the lower-level multi-point control unit changes the terminal number value in the H239 presentation message to the terminal number assigned to the lower-level conference. When the H239 presentation message is sent to the upper-level conference, the lower-level multipoint The control unit changes the terminal number value in the H239 presentation message to the terminal number assigned by the upper conference, and the terminal holding the H239 presentation token sends the second video.

2. The method according to claim 1, further comprising the steps of:

A. When receiving the H239 presentation message sent by the superior conference, the subordinate multipoint control unit treats itself as a terminal of the superior conference;

3. The method of claim 2, further comprising -

4. The method according to claim 2 or 3, further comprising the step of -

E. When the H239 presentation token in the current conference is the cascade port that is cascaded with the upper-level conference, when the lower-level multipoint control unit receives the request message from the terminal in the conference, save the terminal number value in the request message. In the current application terminal variable;

F. After converting the terminal number in the request message to the terminal number assigned by the upper level to the lower level, the terminal number is forwarded to the upper-level conference multi-point control unit.

5. The method of claim 4, further comprising -

6. The method according to claim 4, further comprising:

G2. If the H239 presentation token in the current conference is on the terminal in the lower conference, and receives the request message from the cascade interface that is cascaded with the upper conference, the terminal number value in the request message is saved in the current application terminal variable. in; After the terminal number in the message is converted to the terminal number assigned to the upper level by the lower level, it is forwarded to the terminal holding the token, and the terminal decides whether to agree to release the H239 presentation token. ·

The method according to claim 2 or 3, further comprising:

K. When the Η 239 demo token in the conference is on the terminal of the subordinate conference, the subordinate multipoint control unit receives the release message from the 令牌 239 demo token holding terminal, and forwards it to the cascading port cascaded with the upper conference. The terminal number in the message is converted to the terminal number assigned by the upper-level subordinate, and then directly forwarded to other participating terminals in the conference.