JP2020036156A - Video transmission device, video transmission method, and computer program - Google Patents

Abstract

To improve the quality of video transmitted using a plurality of IP communication paths via a wireless communication path.SOLUTION: A video transmission device includes: a plurality of wireless communication units for establishing a wireless communication path of different wireless communication systems; a wireless measurement unit for measuring a communication quality value of the wireless communication path; a plurality of IP communication units provided corresponding to each of the plurality of wireless communication units for establishing an IP communication path between video receiving devices via the wireless communication path corresponding to the IP communication unit with a different IP address for each IP communication unit; an IP measurement unit for measuring a communication quality value of the IP communication path; a communication path quality determination unit for determining the total communication path quality on the basis of the combination of the communication quality value of the wireless communication path and the communication quality value of the corresponding IP communication path; and a transmission control unit for transmitting video data to the video receiving device using a plurality of IP communication paths. The transmission control unit selects an IP communication path for transmitting the video data on the basis of the total communication path quality and the importance of the video data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a video transmission device, a video transmission method, and a computer program.

  2. Description of the Related Art As a wireless communication technique for improving wireless communication quality, for example, a conventional technique described in Patent Document 1 is known. In the prior art described in Patent Literature 1, a mobile terminal device uses a wireless communication network provided by a plurality of contract carriers based on the reception electric field strength and the error rate of a received signal of the wireless communication network provided by the plurality of contract carriers. , A wireless communication network having a higher received electric field strength or a lower received signal error rate is selected and a connection request is made.

  Further, as a conventional video transmission technology, for example, a conventional technology described in Non-Patent Document 1 is known. According to the conventional technique described in Non-Patent Document 1, when video data is distributed and transmitted over a plurality of IP (Internet Protocol) communication paths, the congestion state of each IP communication path is predicted, and the IP communication in which the congestion is predicted is considered. Decrease the data distribution ratio to roads.

JP-A-2002-30653

"Priority control transmission technology for video file transmission", [Search on August 16, 2018], Internet <URL: https://www.nhk.or.jp/strl/publica/giken_dayori/jp3/mt- 1212.html>

  However, in the above-described conventional wireless communication technology, when the wireless communication network to which the mobile terminal device connects is switched between wireless communication networks provided by a plurality of contract operators, IP communication between the transmitting side and the receiving side is not possible. Is disconnected, so that data communication between the transmitting side and the receiving side is interrupted. For this reason, in the above-described conventional wireless communication technology, for example, in a video transmission system, video data cannot be received on the reception side, and video quality to be reproduced on the reception side is interrupted. Further, with the above-described conventional video transmission technology, it is difficult to adapt to a change in communication quality according to a change in a wireless environment in the wireless communication path when an IP communication path exists via the wireless communication path.

  The present invention has been made in view of such circumstances, and an object of the present invention is to improve the quality of video transmitted using a plurality of IP communication paths via a wireless communication path.

(1) One embodiment of the present invention provides a plurality of wireless communication units that establish wireless communication paths of different wireless communication schemes, a wireless measurement unit that measures a communication quality value of the wireless communication path, and the plurality of wireless communication units. A plurality of IP communication units provided corresponding to each of the units, wherein an IP communication path between video receiving apparatuses via the wireless communication path corresponding to the IP communication unit is provided with a different IP address for each of the IP communication units. A combination of the plurality of IP communication units to be established in, an IP measurement unit for measuring a communication quality value of the IP communication channel, and a communication quality value of the IP communication channel corresponding to the communication quality value of the wireless communication channel A communication channel quality determining unit that determines the total communication channel quality, and a transmission control unit that performs video data transmission to the video receiving device using the plurality of IP communication channels, and the transmission control unit includes: The overall channel quality and video data Selecting the IP communication path for transmitting the video data based on the importance of a video transmission apparatus.
(2) In one aspect of the present invention, the transmission control unit determines a communication volume upper limit of the corresponding IP communication channel based on the total communication channel quality, and determines the IP communication channel until the communication traffic upper limit is reached. The video transmission device according to the above (1), wherein the video data is assigned to the video transmission device.
(3) One aspect of the present invention further includes a handover timing acquisition unit that acquires a handover timing of the wireless communication path, wherein the transmission control unit changes a video data transmission method in accordance with the handover timing. The video transmission device according to any one of (1) and (2).
(4) In one aspect of the present invention, the transmission control unit uses the plurality of IP communication channels corresponding to the plurality of wireless communication channels of the plurality of wireless communication systems having different coverages in accordance with the handover timing. The video transmission device according to the above (3), which transmits video data to the video reception device.
(5) In one aspect of the present invention, the transmission control unit performs video data redundant transmission to the video receiving device using the plurality of IP communication paths in accordance with the handover timing. ) Or (4).

(6) In one aspect of the present invention, the video transmitting apparatus establishes a plurality of wireless communication paths of different wireless communication schemes, and the video transmitting apparatus measures a communication quality value of the wireless communication path. A wireless measurement step, wherein the video transmitting apparatus is provided with a plurality of IP communication steps provided corresponding to each of the plurality of wireless communication steps, and wherein the video transmitting apparatus receives video via the wireless communication path corresponding to the IP communication step. A plurality of the IP communication steps for establishing an IP communication path between devices with a different IP address for each IP communication step; and an IP measurement step for the video transmitting apparatus to measure a communication quality value of the IP communication path. A communication channel quality determining unit configured to determine a total communication channel quality based on a combination of a communication quality value of the wireless communication channel and a communication quality value of the corresponding IP communication channel. And a control step in which the video transmission device transmits video data to the video reception device using the plurality of IP communication paths, wherein the control step includes: A video transmission method for selecting the IP communication path for transmitting the video data based on the importance of the video communication.

(7) One embodiment of the present invention provides a computer of a video transmitting apparatus with a plurality of wireless communication steps for establishing wireless communication paths of different wireless communication schemes, and a wireless measurement step for measuring a communication quality value of the wireless communication path. And a plurality of IP communication steps provided corresponding to each of the plurality of wireless communication steps, wherein the IP communication path between video receiving devices via the wireless communication path corresponding to the IP communication step is the IP communication step. The plurality of IP communication steps established with different IP addresses for each communication step; an IP measurement step of measuring a communication quality value of the IP communication path; and the IP communication path corresponding to the communication quality value of the wireless communication path Channel quality determining step of determining an overall channel quality in combination with a communication quality value of the communication channel, and a video to the video receiving device using a plurality of the IP communication channels. And a control step of transmitting the video communication data based on the overall communication channel quality and the importance of the video data. Select a computer program.

  Advantageous Effects of Invention According to the present invention, it is possible to obtain an effect that the quality of a video transmitted using a plurality of IP communication paths via a wireless communication path can be improved.

FIG. 2 is a block diagram illustrating a configuration example of a video transmission device according to one embodiment. 1 is a block diagram illustrating a configuration example of a video transmission system according to an embodiment. 9 is a flowchart illustrating an example of a procedure of a video transmission method according to an embodiment. FIG. 14 is a block diagram illustrating a configuration example of a video transmission device according to another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a video transmission device according to an embodiment. In FIG. 1, a video transmission device 1 includes a plurality of (n, where n is an integer of 2 or more) communication units 10-1, 10-2,..., 10-n (hereinafter, “communications” Unit 10), an input unit 21, a transmission buffer 22, and a control unit 30. The communication unit 10 includes an antenna 11, a wireless communication unit 12, a wireless measurement unit 13, an IP communication unit 14, and an IP measurement unit 15. The control unit 30 includes a communication channel quality determination unit 31 and a transmission control unit 32.

  In the communication units 10-1, 10-2,..., 10-n, each wireless communication unit 12 establishes a wireless communication path of a different wireless communication system. The wireless communication units 12 provided in the communication units 10-1, 10-2,..., 10-n have respective wireless communication units so that even if wireless communication is performed simultaneously, the wireless communication units 12 do not adversely affect each other's communication quality. The communication method is determined. For example, a wireless communication method using a different frequency band, a different coding method, or the like is determined as the wireless communication method of each wireless communication unit 12. For example, the plurality of wireless communication units 12 may establish wireless communication paths by connecting to wireless communication networks such as mobile telephone networks provided by different communication carriers. In addition, the plurality of wireless communication units 12 may establish wireless communication paths using different wireless communication systems provided by the same communication carrier.

  The antenna 11 is an antenna conforming to the wireless communication system of the wireless communication unit 12 of the own communication unit 10. The wireless measurement unit 13 measures a communication quality value of a wireless communication path established by the wireless communication unit 12 of the own communication unit 10. The communication quality value of the wireless communication path is, for example, an electric field strength or an error rate.

  In the communication units 10-1, 10-2,..., 10-n, different IP addresses are set in the respective IP communication units 14. The IP communication unit 14 establishes an IP communication path between the video receiving devices using its own IP address. The IP communication path between the video receiving apparatuses established by the IP communication unit 14 is an IP communication path via the wireless communication path established by the wireless communication unit 12 of the own communication unit 10. Specifically, the IP communication unit 14 sets its own IP address as the source address for the IP packet that sets the IP address of the video receiving device as the destination address. The IP communication unit 14 passes the IP packet addressed to the video receiving device to the wireless communication unit 12 of the own communication unit 10. The wireless communication unit 12 wirelessly transmits the IP packet addressed to the video receiving device received from the IP communication unit 14 of the own communication unit 10 via the antenna 11 of the own communication unit 10.

  The IP measuring unit 15 measures the communication quality value of the IP communication path established by the IP communication unit 14 of the own communication unit 10. The communication quality value of the IP communication path is, for example, delay, jitter, throughput, or the like.

  The input unit 21 receives a control command and input data such as video data transmitted to the video receiving device. The control command received by the input unit 21 is passed to the control unit 30. The video data received by the input unit 21 is stored in the transmission buffer 22. As an example of the present embodiment, the data size of one piece of video data is a data size that can be stored in one IP packet. Each video data has its own sequence number (ID) and its own importance. The importance of the video data indicates, for example, the importance of a coded frame included in the video data, which is a coded frame in a moving image coding method such as MPEG. Of the three types of MPEG encoded frames “I frame”, “P frame” and “B frame”, the I frame is a key frame of a P frame and a B frame that are decoded with reference to the I frame. Thus, the encoded frame has a higher importance than the P frame and the B frame. As described above, in a coded frame in a moving image coding method such as MPEG, a higher degree of importance is assigned to one coded frame in which more coded frames depend on one coded frame upon decoding.

Alternatively, the importance of video data indicates the importance of video content.
Here, an example of the importance of the video content will be described. As an example of the present embodiment, the video data is image data captured by a plurality of video cameras provided in the self-driving vehicle. The plurality of video cameras include a video camera that images the front of the self-driving vehicle, a video camera that images both sides (right and left sides) of the self-driving vehicle, and a video camera that images the rear of the self-driving vehicle.

  The video data captured by the self-driving vehicle is transmitted from the video transmitting device 1 to the video receiving device, received by the video receiving device, and then reproduced by the video reproducing device to remotely control the self-driving vehicle. Presented to the person. The remote operator remotely controls the self-driving vehicle while watching the presented video. In such a case, the importance of the video of each video camera changes according to the driving situation of the self-driving vehicle. For example, when the self-driving vehicle is traveling straight, the importance of the video of the video camera that captures the front of the self-driving vehicle is relatively high, and the importance of the video of the other video cameras is relatively low. On the other hand, when the self-driving vehicle is making a turn such as a right turn or a left turn, the importance of the video of each video camera that images the front of the self-driving vehicle and the side of the turn is relatively high, and the video of The importance is relatively low. Whether the self-driving vehicle is traveling straight or turning is determined based on the steering wheel operation amount of the self-driving vehicle.

The description returns to FIG.
In the control unit 30, the communication channel quality determining unit 31 determines the total communication channel quality based on a combination of the communication quality value of the wireless communication channel and the communication quality value of the IP communication channel related to one communication unit 10. For example, a function for determining the total channel quality value from the communication quality value of the wireless communication channel and the communication quality value of the IP communication channel is set in advance, and the channel quality determination unit 31 uses the function to determine the total channel quality. Find quality values.

  Note that the channel quality determination unit 31 may determine the overall channel quality by taking into account contract information of the wireless communication method in addition to the communication quality value of the wireless communication channel and the communication quality value of the IP communication channel. Good. The wireless communication contract information is, for example, a communication fee, a contract plan, and the like. The communication path quality determining unit 31 determines, for example, the overall communication path quality corresponding to the wireless communication path established by the wireless communication unit 12 of the wireless communication system whose communication fee is relatively low as relatively good quality.

  The transmission control unit 32 transmits video data to the video receiving device using a plurality of IP communication paths. Specifically, the transmission control unit 32 extracts the video data from the transmission buffer 22 and passes the video data to one of the communication units 10. The IP communication unit 14 of the communication unit 10 stores the video data received from the transmission control unit 32 in an IP packet addressed to the video reception device, and passes it to the wireless communication unit 12 of the own communication unit 10. The wireless communication unit 12 wirelessly transmits the IP packet addressed to the video receiving device received from the IP communication unit 14 of the own communication unit 10 via the antenna 11 of the own communication unit 10. The transmission control unit 32 selects the communication unit 10 that transmits the video data, that is, the IP communication channel, based on the total channel quality and the importance of the video data.

  Next, a video transmission system according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating a configuration example of the video transmission system according to the present embodiment. 2, the video transmission system 100 includes a video transmission device 1 and a video reception device 4. Video data is input from the video generation device 2 to the video transmission device 1. The video generation device 2 generates video data from, for example, image data captured by a video camera. Alternatively, the video generation device 2 may generate video data by, for example, computer graphics.

  The video transmitting apparatus 1 includes n wireless base stations 3-1, 3-2,..., 3-n corresponding to the communication units 10-1, 10-2,. Between them, n wireless communication paths are established. The wireless communication unit 12 of the communication unit 10-1 connects to the wireless base station 3-1 to establish a wireless communication path of the wireless communication system R-1. The wireless communication unit 12 of the communication unit 10-2 connects to the wireless base station 3-2 to establish a wireless communication path of the wireless communication system R-2. Similarly, the wireless communication unit 12 of the communication unit 10-n connects to the wireless base station 3-n to establish a wireless communication path of the wireless communication system Rn.

  Between the video transmitting device 1 and the video receiving device 4, n IP communication paths are established. The IP communication unit 14 of the communication unit 10-1 establishes an IP communication path between the video receiving devices using its own IP address Ad-1 as a source address of the IP packet. The IP communication unit 14 of the communication unit 10-2 establishes an IP communication path between the video receiving devices by using its own IP address Ad-2 as a source address of the IP packet. Similarly, the IP communication unit 14 of the communication unit 10-n establishes an IP communication path between the video receiving devices using its own IP address Ad-n as the source address of the IP packet.

  The n IP communication paths (source addresses Ad-1, Ad-2,..., Ad-n) correspond to the corresponding wireless communication paths (wireless communication schemes R-1, R-2,. R-n). Specifically, the IP packet of the source address Ad-1 is received by the wireless base station 3-1 via the wireless communication path of the wireless communication system R-1, and the IP packet of the Internet or the like is transmitted from the wireless base station 3-1. It is transmitted to the video receiving device 4 via the network. The IP packet of the source address Ad-2 is received by the wireless base station 3-2 via the wireless communication path of the wireless communication system R-2, and is received from the wireless base station 3-2 via an IP network such as the Internet. The data is transmitted to the receiving device 4. Similarly, the IP packet of the source address Ad-n is received by the wireless base station 3-n via the wireless communication channel of the wireless communication system R-n, and transmitted from the wireless base station 3-n to an IP network such as the Internet. Transmitted to the video receiving device 4 via

  The video receiving device 4 receives the IP packet transmitted from the video transmitting device 1 via n IP communication paths. The video receiving device 4 outputs the video data stored in the received IP packet to the video reproducing device 5 in the order of the ID of the video data. The video reproducing device 5 reproduces the video data based on the ID of the video data.

  Next, the operation of the video transmitting apparatus according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart illustrating an example of a procedure of the video transmission method according to the present embodiment.

(Step S1) In the video transmission device 1, the input unit 21 stores the received video data in the transmission buffer 22.

(Step S2) The transmission control unit 32 determines whether a predetermined transmission condition is satisfied. The transmission condition is a condition for executing the video data transmission process. Examples of transmission conditions are shown below.

(Example 1 of Transmission Condition) The total amount of the current video data in the transmission buffer 22 exceeds a predetermined threshold.
(Example 2 of transmission condition) The total number of current video data in the transmission buffer 22 exceeds a predetermined threshold.
(Example 3 of transmission conditions) The time elapsed since the previous transmission timing exceeds a predetermined threshold.

  It should be noted that Examples 1, 2, and 3 of the above-described transmission conditions may be used alone, or a plurality of them may be used in combination.

  When the transmission condition is satisfied, the process proceeds to step S3, and when the transmission condition is not satisfied, the process returns to step S1.

(Step S3) The communication path quality determining unit 31 determines the total communication path quality for each communication unit 10 based on a combination of the communication quality value of the wireless communication path and the communication quality value of the IP communication path. The transmission control unit 32 sets the communication volume upper limit of the IP communication channel for each communication unit 10 based on the total communication channel quality. An example of a method of setting the communication volume upper limit of the IP communication path will be described below.

(Example of IP communication channel upper limit setting method)
The upper limit of the communication amount of the IP communication path is determined by the total communication path quality value Am (Am; m = 1, 2,..., N) corresponding to the IP communication path and the total amount B of the video data in the transmission buffer 22. It is obtained by a predetermined function F as an argument. For example, the communication volume upper limit of the communication unit 10-2 is obtained by F (A2, B). Further, the function F satisfies “ΔF (Am, B) = B”. The function F is determined such that the larger the total channel quality value Am (the higher the quality), the larger the value (the larger the communication volume upper limit). Function F may be a linear function or an exponential function. Further, the function F may be determined in accordance with how to determine the importance of the video data.

(Step S <b> 4) The transmission control unit 32 sequentially selects, from the video data in the transmission buffer 22, the video data with the higher importance, and sends the video data to the IP communication channel of the communication unit 10 with the higher overall communication channel quality. Allocate up to the communication volume upper limit. After the video data is allocated to the upper limit of the communication volume of the IP communication path, the video data is allocated to the IP communication path of the communication unit 10 having the next highest overall communication path quality.

(Step S5) The transmission control unit 32 determines whether all the video data in the transmission buffer 22 has been allocated to the IP communication path. If the result of this determination is that all video data has been assigned to the IP communication path, the flow proceeds to step S6, and if there is still unallocated video data, the flow returns to step S4.

(Step S6) The transmission control unit 32 executes a video data transmission process for transmitting the video data via the IP communication path of the communication unit 10 to which the video data is allocated. By the video data transmission processing, each video data in the transmission buffer 22 is transmitted through the IP communication path to which the video data is assigned.

(Step S7) When the processing in FIG. 3 is ended, the processing in FIG. 3 is ended. On the other hand, when the process of FIG. 3 is continued, the process returns to step S1.

  According to the above-described embodiment, a plurality of IP communication paths are established between video receiving apparatuses via wireless communication paths of different wireless communication schemes, and a communication quality value of the IP communication path corresponding to the communication quality value of the wireless communication path. The IP communication path for transmitting the video data is selected based on the total communication channel quality and the importance of the video data determined by the combination of. Thereby, the transmission IP communication path of the video data can be selected according to the change of the communication quality according to the change of the wireless environment in each wireless communication path, so that the transmission is performed using the plurality of IP communication paths via the wireless communication paths. The effect that the quality of the image to be performed can be improved is obtained.

  According to the present embodiment, stable transmission of high-quality and large-capacity video data is possible in a video transmission system that requires video reliability, such as a video used for remote control of an autonomous vehicle. Is obtained.

[Other embodiments]
Next, a video transmission device according to another embodiment will be described with reference to FIG. FIG. 4 is a block diagram illustrating a configuration example of a video transmission device according to another embodiment. In FIG. 4, parts corresponding to the respective parts in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. The video transmission device 1a shown in FIG. 4 further includes a handover timing acquisition unit 41 in addition to the components of the video transmission device 1 of FIG.

  The handover timing acquisition unit 41 acquires the handover timing of each wireless communication path. The transmission control unit changes the video data transmission method according to the handover timing. A modification example of the video data transmission method will be described below.

(Modification example 1 of video data transmission method)
The transmission control unit 32 transmits video data to the video receiving device using a plurality of IP communication paths corresponding to wireless communication schemes of a plurality of wireless communication schemes having different coverages in accordance with handover timing. At the handover timing of the wireless communication path, there is a possibility that data transmission disturbance may occur in the wireless communication path. Then, it can be assumed that handover timings are different between wireless communication paths of a plurality of wireless communication systems having different coverages. Therefore, by using wireless communication paths of a plurality of wireless communication schemes having different coverages in accordance with the handover timing, data can be smoothly transmitted over another wireless communication path that is not the handover timing at the handover timing of one wireless communication path. Is performed. Thereby, an effect of preventing the disturbance of the video data transmission at the handover timing can be obtained.

(Modification 2 of video data transmission method)
The transmission control unit 32 performs video data redundant transmission to the video receiving device using a plurality of IP communication paths in accordance with the handover timing. In the video data redundant transmission, the same video data is transmitted through a plurality of IP communication paths. Thereby, even if the disturbance of the video data transmission occurs at the handover timing of the wireless communication path corresponding to a certain IP communication path, the disturbance of the video reproduction is prevented by the redundantly transmitted video data by another IP communication path. The effect to be obtained is obtained.

  The first and second modifications of the video data transmission method described above may be used alone, or may be used in combination.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes a design change or the like without departing from the gist of the present invention.

For example, a computer program for realizing the function of each device described above may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read and executed by a computer system. Here, the “computer system” may include an OS and hardware such as peripheral devices.
The “computer-readable recording medium” includes a writable nonvolatile memory such as a flexible disk, a magneto-optical disk, a ROM, and a flash memory, a portable medium such as a DVD (Digital Versatile Disc), and a computer system. Storage device such as a hard disk.

Further, a “computer-readable recording medium” refers to a volatile memory (for example, a DRAM (Dynamic Dynamic Memory)) in a computer system that serves as a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory), which holds programs for a certain period of time.
Further, the above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the "transmission medium" for transmitting a program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
Further, the program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Video transmission apparatus, 2 ... Video generation apparatus, 3-1, 3-2 ... 3-n ... Radio base station, 4 ... Video receiving apparatus, 5 ... Video reproduction apparatus, 10-1, 10- 2,..., 10-n communication unit, 11 antenna, 12 wireless communication unit, 13 wireless measurement unit, 14 IP communication unit, 15 IP measurement unit, 21 input unit, 22 transmission buffer , 30 ... Control unit, 31 ... Communication channel quality judgment unit, 32 ... Transmission control unit, 41 ... Handover timing acquisition unit, 100 ... Video transmission system

Claims (7)

A plurality of wireless communication units each establishing a wireless communication path of a different wireless communication method,
A wireless measuring unit that measures a communication quality value of the wireless communication path,
A plurality of IP communication units provided for each of the plurality of wireless communication units, wherein an IP communication path between video receiving devices via the wireless communication path corresponding to the IP communication unit is provided by the IP communication unit; The plurality of IP communication units established with different IP addresses for each
An IP measuring unit that measures a communication quality value of the IP communication path;
A channel quality determining unit that determines an overall channel quality by a combination of a communication quality value of the wireless channel and a communication quality value of the corresponding IP channel;
A transmission control unit that transmits video data to the video receiving device using the plurality of IP communication paths,
The transmission control unit selects the IP communication path for transmitting the video data based on the total communication path quality and the importance of the video data.
Video transmission device. The transmission control unit determines a communication volume upper limit of the corresponding IP communication channel based on the total communication channel quality, and allocates the video data to the IP communication channel until the communication volume upper limit is reached.
The video transmission device according to claim 1. The wireless communication path further includes a handover timing acquisition unit for acquiring a handover timing,
The transmission control unit changes the video data transmission method in accordance with the handover timing,
The video transmission device according to claim 1. The transmission control unit performs video data transmission to the video reception device using the plurality of IP communication paths corresponding to the plurality of wireless communication paths of the plurality of wireless communication schemes having different coverages in accordance with the handover timing. ,
The video transmission device according to claim 3. The transmission control unit performs video data redundant transmission to the video receiving device using the plurality of IP communication paths in accordance with the handover timing.
The video transmission device according to claim 3. Video transmission device, a plurality of wireless communication steps to establish wireless communication paths of different wireless communication system,
The video transmission device, a wireless measurement step of measuring the communication quality value of the wireless communication path,
An IP communication path between the video reception apparatuses via the wireless communication path corresponding to the plurality of IP communication steps, wherein the plurality of IP communication steps are provided corresponding to each of the plurality of wireless communication steps; The plurality of IP communication steps to establish a different IP address for each IP communication step,
An IP measurement step in which the video transmission device measures a communication quality value of the IP communication path;
A communication channel quality determining step of determining the total channel quality by a combination of the communication quality value of the wireless communication channel and the communication quality value of the corresponding IP communication channel,
The video transmitting device, the control step of transmitting video data to the video receiving device using a plurality of the IP communication path,
The control step selects the IP communication path for transmitting the video data based on the total communication path quality and the importance of the video data,
Video transmission method. In the computer of the video transmission device,
A plurality of wireless communication steps for establishing wireless communication paths of different wireless communication systems,
A wireless measurement step of measuring a communication quality value of the wireless communication path,
A plurality of IP communication steps provided corresponding to each of the plurality of wireless communication steps, wherein an IP communication path between video receiving apparatuses via the wireless communication path corresponding to the IP communication step is provided in the IP communication step. Said plurality of said IP communication steps established with a different IP address for each,
An IP measurement step of measuring a communication quality value of the IP communication path;
A channel quality determining step of determining a total channel quality by a combination of a communication quality value of the wireless channel and a corresponding communication quality value of the IP channel;
And a control step of transmitting video data to the video receiving device using the plurality of IP communication paths.
The control step selects the IP communication path for transmitting the video data based on the total communication path quality and the importance of the video data,
Computer program.

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