WO2007009293A1

WO2007009293A1 - Method for remote controlling the h.320 video conference terminal

Info

Publication number: WO2007009293A1
Application number: PCT/CN2005/001072
Authority: WO
Inventors: Hui Li; Xiaobin Zhu; Zhiping Tian
Original assignee: Zte Corporation
Priority date: 2005-07-19
Filing date: 2005-07-19
Publication date: 2007-01-25
Also published as: CN101142819A; CN100551029C

Abstract

The invention discloses a method for remote controlling the H.320 video conference terminal. The method includes starting the process of remote controlling between the said main controlling terminal and the controlled terminal, creating a data channel for remote controlling between the said main controlling terminal and the controlled terminal, and communicating between the said main controlling terminal and the controlled terminal on the said data channel for remote controlling, and completing the remote controlling. Using the method of the invention to remote controlling the H.320 video conference terminal, the controlled terminal does not need a computer network interface, and the serviceable range of the remote controlling on the terminal is extended. The method of the invention uses the intrinsic line of the H.320 video conference terminal to transmitting the information in order to realize the remote controlling and reduce the maintenance cost of the terminal.

Description

Method for remotely controlling H.320 conference television terminal

Technical field

The invention relates to the field of digital multimedia communication, in particular to a method for remotely controlling an H.320 conference television terminal through an H.320 conference television line.

Background technique

With the development of information technology, conference TV has become more and more large-scale and adopted by various industries. Correspondingly, the entire network of conference TV is also getting larger and larger, and the maintenance cost brought by it is also coming. The higher.

There are three traditional methods for remotely controlling a conference television terminal: Method 1: Install a Simple Network Management Protocol (Simple Network Management Protocol) for remote terminals, and connect remote terminals to the same Internet. On the Internet Protocol (IP) network, all network terminals are remotely controlled through the network management center at the central site.

Method 2: For the remote terminal built-in web server (web server), log in to the remote terminal's page through the browser at the central site, thereby achieving control and management of the remote terminal.

Method 3: Specially develop a transmission control protocol/internet protocol for remote terminals

The (Transmission Control Protocol/Internet Protocol) (hereinafter referred to as TCP/IP) communication software connects TCP/IP control connections at the central site and remote terminals, and controls and manages remote terminals through dedicated software.

In general, the above three methods, whichever one, require a computer network interface available between all controlled remote terminals and the central site, and in the application of H.320 videoconferencing terminals, this requirement Not always satisfied. Especially for many Just to ensure that the dedicated users of the conference network, only 2M dedicated conference television network is built, and for the remote control of such equipment, there is no way to remotely control. Summary of the invention

In order to overcome the shortcomings of the prior art that the computer network interface is required for remote control of the H.320 conference television terminal, the object of the present invention is to provide a remote control of the H.320 conference television terminal using the H.320 conference television line. method.

In order to achieve the above object, a method for remotely controlling an H.320 conference television terminal according to the present invention requires the use of at least two H.320 conference television terminals. For the sake of simplicity, the term "a subsequent part of the present invention" appears. "The terminal" refers to the H.320 videoconferencing terminal, one of which is a local master terminal, and the others are remotely controlled terminals, and the number of the controlled terminals is not limited. The method includes the following steps:

Step 1: Start the remote control process of both the main control terminal and the controlled terminal, even if both the main control terminal and the controlled terminal enter the remote control state;

Step 2: Establish a data channel for remote control between the above-mentioned master terminal and the controlled terminal;

Step 3: The above-mentioned main control terminal and the controlled terminal communicate on the above-mentioned data channel for remote control, and complete remote control.

Wherein, the above step 1 includes the following steps:

Step 111: Establish a data transmission channel between the above-mentioned master terminal and the controlled terminal participating in the remote control;

Step 112: The above-mentioned master terminal sends the above-mentioned controlled terminal through the above data transmission channel. Sending a message, that is, remotely controlling the startup message, notifying the controlled terminal to start the remote control process, thereby setting the mechanism and process controlled by the remote controlled terminal to be the same as the mechanism and process controlled by the local master terminal, so that the above Both the master terminal and the controlled terminal enter the remote control state.

The above step 111 includes:

1) establishing only one bidirectional data transmission channel between the above-mentioned master terminal and the controlled terminal; or

2) A two-way data transmission channel is established between the above-mentioned master terminal and the controlled terminal, and a unidirectional data transmission channel is separately established. The remote channel in H.320 conference television is a one-way data transmission channel.

The two-way data transmission channel refers to that the master terminal and the controlled terminal can mutually receive data transmitted by each other on at least one standard channel of the H.320 conference television system, wherein the unidirectional data transmission channel and the two-way data transmission channel are both Refers to logical functions and does not necessarily have separate entities. Moreover, since the two-way data transmission channel has the function of realizing one-way data transmission at the same time, the two-way data transmission channel can be used for unidirectional data transmission without separately establishing the unidirectional data transmission channel.

The master terminal in the foregoing step 112 may send the foregoing remote control start message to the controlled terminal in any feasible manner, for example, including the following manners:

1) Extend the H2.81 protocol message set to define a dedicated remote control start message; or

2) A special flag is inserted in the code stream of the video channel, and a separate unidirectional data transmission channel is not used at this time. Wherein, the above step 2 includes the following steps:

Step 211: The above-mentioned master terminal and the controlled terminal jointly open a pre-agreed data channel on the basis of the two-way data transmission message established in the above step 1;

Step 212: The above-mentioned master terminal and the controlled terminal establish a bidirectional logical channel, that is, a remote control channel, based on the data channel opened in the above step 211, to transmit control and response information in the remote control process.

The data channel in the above step 211 may be any entity that implements bidirectional transparent transmission of data by using the above bidirectional data transmission channel, for example, Low Speed Data (hereinafter referred to as LSD) specified by the protocol system of the H.320 conference television. ), one of High Speed Data (HSD), Multi-layer-protocol (MLP), or High Multi-layer-protocol (H-MLP) Or, the above-mentioned master terminal and the controlled terminal temporarily stop the video channel that is idle to transmit video data, or a partial time slot in the above channel or a combination thereof.

The method for establishing the remote control channel on the basis of the data channel opened in the above step 211 is arbitrary, and includes, for example:

1) using a continuous bit string of fixed length but variable content as a remote control channel;

2) a series of consecutive message packets composed of byte strings of different lengths and uses as a remote control channel; or

3) establishing a TCP/IP protocol stack on the data channel opened in the above step 211 and transmitting one of the Transmission Control Protocols (Transmission Control Protocol) TCP) Port or User Datagram Protocol (UDP) port as the remote control channel.

Wherein, the above step 3 includes the following steps:

Step 311: The foregoing control terminal sends control information to the controlled terminal by using the remote control channel.

Step 312: The controlled terminal receives the control information on the remote control channel and executes the control information.

Step 313: The controlled terminal sends response information to the main control terminal by using the remote control channel.

Step 314: determining whether the remote control process ends, if otherwise, the above-mentioned master terminal and the controlled terminal repeatedly perform the above steps 311 to 313 until the remote control process ends; if yes, the remote control process is ended; The transmission of the control information and the response information does not have to follow a strict timing relationship, as long as both the master terminal and the controlled terminal can correctly understand each piece of information.

The essence of the method of the present invention is to transmit control and response information between the main control terminal and the controlled terminal through the H.320 conference television line, and remotely control the H.320 conference television terminal by using the method of the present invention. The controlled terminal is not required to be equipped with a computer network interface, and the application range of the remote control on the terminal is expanded; the method of the present invention uses the inherent line of the H.320 conference television terminal for information transmission, which facilitates remote control and can reduce the terminal device. Maintenance costs.

The above and other objects, features and advantages of the present invention will become more <RTIgt; DRAWINGS

1 is a schematic view of an application mode of the present invention.

2 is a general flow chart of the remote control method of the present invention.

Figure 3 is a flow diagram of step 111 in an embodiment of the invention.

Figure 4 is a flow diagram of the present invention from establishing a remote control channel until remote control information is executed and responded. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

1 is a schematic view of an application mode of the present invention. As shown in Figure 1, the "terminal" in the figure refers to the H.320 videoconferencing terminal. Correspondingly, the "link" and "network" in the figure refer to the H.320 conference television link and H, respectively. The .320 conference television network, in which the above "link" and "network" together constitute an H.320 conference television line. The two terminals respectively access the network through the link, thereby realizing end-to-end data transmission and information exchange. The present invention realizes in-band remote control of the remote terminal by controlling the connection of the local terminal.

2 is a flow chart of the remote control method of the present invention. As shown in FIG. 2, the method of the present invention mainly includes the following steps:

Step 201: start;

Step 202: Connect the local terminal by using dedicated software and a local control system; wherein the dedicated software can be obtained through separate development or modified on the basis of local control software;

Step 203: Establish a one-way and two-way data transmission channel between the two terminals; Step 204: Send a remote control startup message.

Step 205: Open a bidirectional data channel between the two terminals;

Step 206: Establish a remote control logical channel;

Step 207: Send control to the remote terminal through the local terminal by using local control software.

I port 'Θ,;

Step 208: The remote terminal executes control information.

Step 209: The remote terminal sends the response information to the local terminal and the control software. Step 210: Repeat the above steps 207 to 209 until the current control ends. Step 211: Send the remote control termination message through the local terminal, and the process ends. A specific embodiment is illustrated below to illustrate that the terminal commands the remote end to perform an input video parameter adjustment command by the method of the present invention.

In implementing the above step 111, the terminal uses the LSD channel as a unidirectional data transmission and the video channel as a two-way data transmission. Figure 3 is a step in an embodiment of the present invention

Flow chart of 111. As shown in Figure 3, it mainly includes the following steps:

Step 301: start;

Step 302: Bring two terminals that need to participate in the remote control (referred to as one terminal A as terminal A, and correspondingly another terminal as terminal B) into the same newly started H.320 conference, where the two terminals Must have the ability to transmit H.281 messages over the LSD channel. If the two terminals enter a multipoint conference, the Multipoint Controller Unit (hereinafter referred to as MCU) also has the corresponding capabilities;

Step 303: Determine the type of the current conference. If the current conference is a point-to-point conference, both terminals can open the LSD channel to send data to the other party, and the two ends. The terminals can receive each other's data on the video channel, wherein each other sees the image of the other party, which can be referred to as "image mutual viewing". Therefore, both the one-way and two-way data transmission mechanisms have been implemented, and step 308 is performed; If the conference is a multipoint conference, step 304 is performed;

Step 304: The terminal A sends a CCA message, applies for a chair token, and the MCU responds to the request, and gives the terminal A a chair token;

Step 305: The terminal A sends a VCB message, and the parameter of the message is the M/T number of the terminal A. The MCU responds to the message and broadcasts the image of the terminal A to all other terminals in the conference, so that the terminal B sees the terminal A. Image;

Step 306: The terminal A sends a VCS message, requesting an image selection, the parameter of the message is the M/T number of the terminal B, and the MCU responds to the message, and sends the image of the terminal B to the terminal A, and the multi-point conference condition Two terminals A and B realize image mutual viewing, and a two-way data transmission mechanism is implemented.

Step 307: The terminal A sends a DCA-L message to apply for an LSD token, and the MCU responds to the request, and the LSD token is given to the terminal A, so that the terminal A has the right to send data to the terminal B on the LSD channel in the multipoint conference. At this point, the one-way data transmission mechanism is also implemented;

Step 308: End.

Terminal A then sends a remote control initiation message through the LSD channel, which is actually an extended H.281 message, specifically belonging to the Action message. Table 1 shows the structure of the remote control start message - Table 1

The first part in Table 1 is a 1-byte action code, and the H.281 protocol uses 0x01-0x07. In this embodiment, it is set to 0x09, so that terminal B can separate the remote control through the action code of 0x09. Start message

The second part of Table 1 uses four bytes to indicate the device type of the desired controlled terminal. For the sake of simplicity, the present embodiment requires the master terminal and the controlled terminal to be the same type of terminal, and the controlled terminal can determine its own. The device type is the same as the device type represented in this section and is handled differently.

Terminal A (B) stops transmitting video data on the video channel after transmitting (receiving) the remote control start message, and in the subsequent remote control process, the terminal directly uses the idle video channel as a data channel for remote control. A remote control channel is established thereon.

In this embodiment, the remote control channel is composed of message packets, and each message packet is composed of a number of bytes. The message packet is transmitted on the video channel, and the contents of the same message packet are continuously transmitted in order. The first byte of the latter message packet is transmitted along with the last byte of the previous message packet, and both terminals A and B are themselves The uplink video channel transmits a message packet and receives a message packet from the downlink video channel, thereby establishing a remote control channel.

Table 2 shows the format of the message packets that make up the above remote control channel - Table 2

Order Field Name Length (Bytes) Meaning

1 header 4 as the starting flag, the content is always 0x12 0x56

0x34 0x78

2 length 4 total of all fields of this message including the header Length (bytes)

3 No. 4 The initial value is zero, and each time a message is sent, the serial number is added.

1

4 Code 4 indicates the type of this message

5 Parameter Uncertain varies with the code field, the length is the total length of the message minus 18 where the first part of Table 2 is a fixed header of 4 bytes, as the starting flag of the message;

The second part in Table 2 is the length of 4 bytes, giving the total length of a certain message packet; the third part in Table 2 is the sequence number of 4 bytes, and the terminal checks whether the serial number is continuous when receiving the message. To determine if there is a message missing;

The fourth part in Table 2 is a 4-byte code giving the type of this message packet; the fifth part in Table 2 is a variable-length message parameter, different types of message packets, the length and meaning of the parameters. all different.

Table 3 gives the range and meaning of the above message code:

table 3

The "Connected" and "Connected" messages in Table 3 are used to correctly locate the message packet in the byte stream transmitted over the video channel - this process can be synchronized;

The "fill" message in Table 3 is used to maintain synchronization of message reception;

The "Control" message in Table 3 is used for control information and response information transmitted between the two terminals.

Figure 4 is the terminal from the establishment of the remote control channel until the remote control information is executed and responded Complete action flow chart. The usage of the above message will be described in detail below with reference to FIG. As shown in Figure 4, it includes the following steps:

Step 401: Start sending and receiving a message packet on a video channel.

Step 402 to step 405 is a process in which the master terminal and the controlled terminal perform a communication handshake on the remote control channel. First, step 402: the main control terminal sets the type of the sent message packet to be "connected";

Step 403: The controlled terminal separates one message from the byte stream by searching for the message header, and obtains the message type according to the message format defined in Table 2 above. To prevent false positives, the controlled terminal must be consecutive five. After receiving the "connected" or "connected" message, the process proceeds to step 404, otherwise step 403 is repeated. Obviously, this step is essentially a process of receiving and synchronizing the received video data according to the format of the message packet;

Step 404: The type of the message reported by the controlled terminal is set to "Connected"; Step 405: In order to ensure that the main control terminal can also receive enough "Connected" or "Connected" messages to achieve synchronization of the reception of the message packet. , "Connected" message must be sent at least five times; If the master terminal sends at least five "connected" messages and also receives at least five "connected" messages sent by the controlled terminal, it means that the master terminal Receiving synchronization with the controlled terminal, in this case, the handshake is considered successful, step 406 is performed, otherwise step 405 is repeated;

Step 406: Determine whether the local end is the sending end of the software code, that is, whether the local end is the main control terminal, if yes, execute step 407, otherwise execute 411;

Step 407: The main control terminal sends a "control" message, specific control commands, etc. The content as a parameter of the message, for example, a command message string for local control may be used as a parameter;

Step 408: The master terminal sets the sending message type to "padding"; since the video channel used by the remote control channel is a channel with a constant bandwidth, it requires that the message packet must be sent continuously, otherwise the controlled terminal loses the message. The receiving of the packet is synchronized, so the master terminal must send a "fill" message when no other type of message can be sent to maintain the receiving synchronization of the controlled terminal. The parameters of the message are meaningless, and the length is subject to the purpose of filling;

Step 409: Determine whether the master terminal receives the "control" message of the controlled terminal, if yes, execute step 410, otherwise repeat step 409;

Step 410: Processing a "control" message sent by the controlled terminal;

Step 411: The controlled terminal sets the sending message type to "fill", its purpose and steps

408 is the same;

Step 412: Determine whether the controlled terminal receives the "control" message of the master terminal, if yes, execute 410, otherwise repeat step 412;

Step 413: The controlled terminal processes the received "control" message, and takes out the parameter content for analysis and execution;

Step 414: The controlled terminal generates a "control" message to the main control terminal by using the execution result of step 413 as a parameter. Actually, here is a response message string for local control as a parameter;

Step 415: Determine whether the remote control process is finished, if yes, execute step 416, otherwise perform step 406; Step 416: End.

The above is a detailed description of the working principle of the present invention, but this is merely a visual example for the purpose of understanding, and should not be construed as limiting the scope of the invention. Also, various possible modifications or substitutions may be made in accordance with the description of the technical solutions of the present invention and the preferred embodiments thereof, and all such changes or substitutions are intended to fall within the scope of the appended claims.

Claims

Rights request

A method for remotely controlling an H.320 conference television terminal, characterized in that at least two H.320 conference television terminals are required, one of which is a local master terminal, and the other is a remote location. The terminal is controlled, and the number of the controlled terminals is not limited. The method includes the following steps:

Step 1: starting the remote control process of both the main control terminal and the controlled terminal, even if the main control terminal and the controlled terminal enter the remote control state;

The method of claim 1 wherein said step 1 comprises the following steps:

Step 112: The above-mentioned main control terminal sends a message to the controlled terminal through the data transmission channel, that is, the remote control start message, notifying the controlled terminal to start the remote control process, and entering the remote control state.

The method according to claim 2, wherein said step 111 comprises: 1) establishing only one bidirectional data transmission channel between said master terminal and said controlled terminal; or 2) A unidirectional data transmission channel is separately established after establishing a two-way data transmission channel between the above-mentioned master terminal and the controlled terminal.

The method according to claim 3, wherein said two-way data transmission channel means that said master terminal and said controlled terminal can mutually receive data transmitted by each other on at least one standard channel of H.320 conference television system. .

The method according to claim 2, wherein the manner in which the master terminal in the step 112 sends the remote control start message to the controlled terminal includes:

2) Insert a special tag into the stream of the video channel.

6. The method of claim 1 wherein said step 2 comprises the following steps:

Step 211: The foregoing control terminal and the controlled terminal jointly open a pre-agreed data channel based on the bidirectional data transmission message established in the foregoing step 1;

Step 212: The above-mentioned master terminal and the controlled terminal establish a bidirectional logical channel, that is, a remote control channel, on the basis of the data channel opened in the above step 211, to transmit control and response information in the remote control process.

The method according to claim 6, wherein the data channel in the step 211 is a low-speed data channel, a high-speed data channel, a multi-layer protocol channel or a high-multilayer protocol channel specified by a protocol system of the H.320 conference television. One of the above, or the video channel that the above-mentioned master terminal and the controlled terminal temporarily stop transmitting video data, or a partial time slot in the above channel or a combination thereof.

The method of claim 6, wherein the step 212 of establishing the remote control channel based on the data channel opened in the step 211 is as follows:

3) A transmission control protocol/internet protocol protocol stack is established on the data channel opened in the above step 211, and one of the transmission control protocol port or the user data packet protocol port is used as the remote control channel.

9. The method of claim 1 wherein said step 3 comprises the steps of:

Step 313: The controlled terminal sends the response information to the main control terminal by using the remote control channel.

Step 314: Determine whether the remote control process ends. Otherwise, the above-mentioned master terminal and the controlled terminal repeatedly perform the above steps 311 to 313 until the remote control process ends; if yes, the remote control process ends; The transmission of the control information and the response information does not have to follow a strict timing relationship, as long as both the master terminal and the controlled terminal can correctly understand each piece of information.