JP2000358004A - System and method for data broadcasting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of data reception by providing a cyclic group setting means and cyclic transmission means and allowing the cyclic group setting means to plurally provide the same information data in one cyclic group so as to reduce time for acquiring data. SOLUTION: Important data are plurally provided in one transmission cycle of cyclic transmission and transmitted. Namely, important data among file 1-1 to file 1-4 information data, are respectively transmitted by digital broadcasting. Since data which should be acquired first without fail are plurally provided in one cyclic group in advance of acquiring another file like directory information by this constitution, average of time for obtaining necessary data can be reduced to reduce the expected value and the maximum value of time until acquiring of a desired file. Then, much influence is not given to the whole transmission loop period, efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a DSM-CC Data Carous
The present invention relates to a cyclic transmission method and an apparatus for enabling optimal transmission by data to be subjected to Carousel in data transmission using el.

[0002]

2. Description of the Related Art The International Standards Organization (ISO / IEC JTC1 / SC29 / WG11 MPEG) is a type of data transmission system related to the present invention.
Coding methods studied in (ISO / IEC JTC1 / SC29 / W
G11 MPEG IS 13818, “Information technology − Gen
eric coding of moving pictures and associated audi
o information-") Part 6 (ISO / IEC 13818-6,
“Digital Storage Media Command & Control”). This Digital Storage Media Command & Control
There is Download Data Carousel as a scenario of a data transmission method in broadcasting of DSM-CC (abbreviated as DSM-CC).

The data transmitted in the Download Data Carousel simply transmits related files and data as shown in FIG. 11 in order.

[0004] Another type of data transmission system related to the present invention includes satellite digital broadcasting (such as CS digital broadcasting).
Data broadcasting system. Similarly, in the data broadcasting system of this satellite digital broadcasting, related files and data are sequentially transmitted as shown in FIG.
In the case of data related to nic programming guide), the same data is simply retransmitted once at a fixed time interval (for example, one second).

[0005]

However, in the above-mentioned conventional method, in the case where related files and data are simply transmitted, the time from the start of data acquisition to the end of data acquisition in any data acquisition. If the acquisition start time is random, it will be any time between the minimum time and the maximum time with uniform probability.

Minimum time: amount of data to be acquired / transmission speed

Maximum time: (data amount to be acquired + total data amount) / transmission speed

However, in the case of files and data that are related to each other, if the time from the start of data acquisition to the end of data acquisition can be classified into those that are relatively good and those that are relatively long and have little effect, they are relatively long. Even if the data has little effect, the data is transmitted in vain, and the overall efficiency is lowered, and the data acquisition time is longer for data that is relatively short.

In order to shorten the data acquisition time of a relatively short data, simply increasing the transmission speed unnecessarily increases the necessary minimum performance of the receiving apparatus, leading to an increase in cost and a data transmission bandwidth. Was needed unnecessarily.

Further, since all data are transmitted only the same number of times, a fatal data error caused by some cause (rainfall in the case of satellite broadcasting, an obstacle such as an airplane in the case of a satellite, or a building in the case of a terrestrial moving body) is eliminated. The number of recoverable times was uniform for all files and data.

[0011] Even in the conventional system, the entire data transmission band may be used by dividing it into several parts. However, this is from the viewpoint of securing a broadcast service channel, and is not different from analog frequency band division. There is no way.
These lacked the viewpoint of transmitting data in an effective transmission method due to the mutual relation of data transmitted within the service.

As described above, in the prior art, a transmission method according to the necessity of a file or data has not been made.

Accordingly, the present invention provides a data broadcasting system and a data broadcasting method for adaptively transmitting files and data according to the necessity.

[0014]

According to the first aspect of the present invention,
In order to solve the above-mentioned problem, in a data broadcasting system for transmitting digital broadcasting, a cyclic group setting means for collectively setting a plurality of pieces of information data to be transmitted as one group, and cyclically transmitting the set cyclic group as one transmission cycle. And a cyclic transmission means, wherein the cyclic group setting means provides a plurality of the same information data in one cyclic group.

According to a second aspect of the present invention, there is provided a data broadcasting system for transmitting digital broadcasting, wherein a plurality of information data to be transmitted are collectively set as one group, and Cyclic transmission means for cyclically transmitting the cyclic group as one transmission cycle, wherein the cyclic transmission means divides a transmission band so as to transmit all information data in the cyclic group in one transmission cycle. It is characterized by being transmitted simultaneously.

According to a third aspect of the present invention, in the data broadcasting system according to the first or second aspect, the cyclic group setting means sets a plurality of cyclic groups and solves the problem. The transmission means causes each of the plurality of cyclic groups to be cyclically transmitted.

According to a fourth aspect of the present invention, there is provided a data broadcasting system according to the first aspect, wherein:
The cyclic transmission means transmits the cyclic group using a normal band, and transmits the specific information data using only the normal band and a dedicated band only when transmitting the specific information data. It is characterized by the following.

According to a fifth aspect of the present invention, there is provided a data broadcasting system as set forth in the fourth aspect, wherein:
The cyclic transmission means causes a plurality of cyclic groups to be transmitted,
It is characterized in that the dedicated band is shared and used by a plurality of cyclic groups for transmitting specific information data.

According to a sixth aspect of the present invention, there is provided a data broadcasting system according to the first aspect, wherein:
The cyclic transmission means may provide a delay time between transmission of information data and transmission of next information data.

According to a seventh aspect of the present invention, there is provided a data broadcasting system according to the second aspect, wherein
The cyclic group setting means includes normal information data and specific information data, and sets the group as one group, and the cyclic transmission means transmits the specific information data, sets a delay time, and sets the normal information data. It is characterized by transmission.

According to an eighth aspect of the present invention, there is provided a data broadcasting system for transmitting a digital broadcast, comprising: a transmission rate setting means for setting all transmission rates of information data to be transmitted constant; Cyclic transmission means for cyclically transmitting each of the information data at the transmission rate set in the means.

According to a ninth aspect of the present invention, there is provided a data broadcasting system for transmitting a digital broadcast, wherein a plurality of pieces of information data to be transmitted are collectively set as one group, and Cyclic transmission means for cyclically transmitting the cyclic group as one transmission cycle, wherein the cyclic group setting means includes a specific cyclic group having specific information data and a normal cyclic group including normal information data. The transmission cycle of the specific cyclic group is set to be shorter than the transmission cycle of the normal cyclic group, and the cyclic transmitting unit cyclically transmits the specific cyclic group and the normal cyclic group, respectively. is there.

According to a tenth aspect of the present invention, in the data broadcasting system according to the ninth aspect, the cyclic transmission means preferentially transmits the specific cyclic group using a dedicated band. And transmitting the normal cyclic group using only a vacant band excluding the dedicated band.

According to an eleventh aspect of the present invention, there is provided a data broadcasting method for transmitting a digital broadcast, wherein a plurality of information data to be transmitted are collectively set as one group. A cyclic transmission step of cyclically transmitting the cyclic group as one transmission cycle, wherein the cyclic group setting step provides a plurality of the same information data in one cyclic group.

According to a twelfth aspect of the present invention, there is provided a data broadcasting method for transmitting a digital broadcast, wherein a plurality of information data to be transmitted are collectively set as one group. A cyclic transmission step of cyclically transmitting the cyclic group as one transmission cycle, wherein the cyclic transmission step divides a transmission band so as to transmit all information data in the cyclic group in one transmission cycle. It is characterized by being transmitted simultaneously.

According to a thirteenth aspect of the present invention, in the data broadcasting method according to the eleventh or twelfth aspect, the cyclic group setting step comprises:
A plurality of cyclic groups are set, and the cyclic transmitting step cyclically transmits the plurality of cyclic groups, respectively.

According to a fourteenth aspect of the present invention, there is provided a data broadcasting method according to the eleventh aspect, wherein:
The cyclic transmission step causes the cyclic group to be transmitted using a normal band and causes the specific information data to be transmitted using the dedicated band together with the normal band only when transmitting the specific information data. It is characterized by the following.

According to a fifteenth aspect of the present invention, there is provided a data broadcasting method according to the fourteenth aspect, wherein
In the cyclic transmission step, a plurality of cyclic groups are transmitted, and the dedicated band is shared and used by a plurality of cyclic groups for transmitting specific information data.

According to a sixteenth aspect of the present invention, there is provided a data broadcasting method according to the eleventh aspect, wherein:
The cyclic transmission step is characterized in that a delay time is provided between transmission of information data and transmission of next information data.

According to a seventeenth aspect of the present invention, there is provided a data broadcasting method according to the twelfth aspect, wherein
The traveling group setting step includes normal information data and specific information data, and is set as one group;
The cyclic transmission step is characterized in that, after transmitting the specific information data, the normal information data is transmitted with a delay time.

According to an eighteenth aspect of the present invention, in a data broadcasting method for transmitting a digital broadcast, a transmission rate setting step for making all transmission rates of information data to be transmitted constant; Cyclically transmitting each of the information data at the transmission rate set in the step.

According to a nineteenth aspect of the present invention, there is provided a data broadcasting method for transmitting a digital broadcast, wherein a plurality of information data to be transmitted are collectively set as one group. A cyclic transmission step of cyclically transmitting the set cyclic group as one transmission cycle, wherein the cyclic group setting step includes the steps of: setting a specific cyclic group having specific information data and a normal cyclic group including normal information data; The transmission cycle of the specific cyclic group is set to be shorter than the transmission cycle of the normal cyclic group, and the cyclic transmitting step cyclically transmits the specific cyclic group and the normal cyclic group, respectively. is there.

According to a twentieth aspect of the present invention, there is provided a data broadcasting method according to the nineteenth aspect, wherein
Wherein the cyclic transmission step causes the specific cyclic group to be preferentially transmitted using a dedicated band, and causes the normal cyclic group to be transmitted using only a vacant band excluding the dedicated band. It is assumed that.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a data broadcast transmitting apparatus and a data broadcast receiving apparatus according to the present invention.

The data 1a and 1b shown in FIG. 1 are data to be transmitted contained in a storage, a data source and the like.
2b and 2c can be sequentially multiplexed by the serial multiplexing unit. In addition, parallel multiplexing can be performed in the sub thread multiplexing units 4a and 4b. These two types of multiplexing systems can be controlled by three transmission control units. Based on the state and information from the storage and the like, only serial multiplexing, only parallel multiplexing, multiplexing of both,
Optimum transmission is enabled by adaptively switching by changing the rate. 5 performs multiplexing of Threads, 6 performs data conversion to the physical layer, and stream data is transmitted from the transmission device.

Thereafter, the transmitted data is received by the conversion unit from the physical layer 7 of the receiving apparatus, and the data is transmitted by the 8 Thread Demu
It is separated into Thread at x part.

Since both serial multiplexing and parallel multiplexing can be realized by performing multiplexing using packet identifiers in the same layer, the demux sections 9a, 9b and 9c can separate data regardless of serial multiplexing or parallel multiplexing. is there. Control is performed by ten reception control units based on the state and information from each block. The separated file is stored in a storage or the like.

When multiplexing a Thread with a packet identifier of the same layer as that of a Sub Thread or the like, a Thread of 8 is used.
The functions of the d Demux section and the 9 Demux sections can be realized by one block.

In this way, the adaptively multiplexed data stream can be easily separated into individual received data by the receiving device.

In such a data broadcasting system,
The transmission data multiplexing method is changed to enable optimal transmission.

Hereinafter, the present invention will be described with reference to a schematic diagram of an image of transmission data.

First, as a first embodiment, important information which must be received among transmitted data, management information of transmitted data (directory information,
A transmission method (sequential transmission) for shortening the transmission cycle such as DownloadInfoIndication) will be described.

In this case, as shown in FIG. 2, a plurality of important data are provided and transmitted in one transmission cycle of cyclic transmission.

In FIG. 2, file1-1, file1-2, fil
e1-3 and file1-4 are information data transmitted by digital broadcasting, respectively.

By performing multiplexing as described above, f
Since the average of the time to acquire ile1-1 becomes shorter, both the expected value and the maximum value of the time to acquire the target file become shorter.

Also, for the file to be transmitted, file1-1
If (directory information, DownloadInfoIndication, etc.) is sufficiently small or if the number of files to be transmitted is large, the entire transmission loop cycle is not much affected, and the efficiency is high.

Further, since the transmission method is simple, it can be easily realized by a transmission device.

Next, as a second embodiment, a method of transmitting all data in a group in parallel (a data loop period synchronization type) will be described.

In this case, as shown in FIG.
Ream bandwidth (Thread) is subdivided for each file (Sub-Thre
ad) and transmit the file on each Sub-Thread. The files are transmitted simultaneously in parallel, and the transmission cycle of each file is synchronized.

Since the transmission rate of each file is reduced by such multiplexing, when the bandwidth is wide (at a high bit rate), the amount of processing on the receiving device side is reduced.

Further, since the transmission periods of all the files are synchronized, when files are obtained one by one continuously, it is time efficient.

Next, as a third embodiment, a method of transmitting all data in a group in parallel (when the data rate is constant) will be described.

In this case, as shown in FIG.
Ream's belt is subdivided for each file (divided into Sub-Threads) and the file is transmitted in each Sub-Thread. The files are transmitted simultaneously in parallel, and the transmission speed of each file is constant.

Since the transmission rate of each file is reduced by such multiplexing, when the bandwidth is wide (at a high bit rate), the processing amount on the receiving device side is reduced.

Further, since the transmission speeds of all the sub-threads are the same, the rate control becomes simpler than in the second embodiment.

Next, as a fourth embodiment, a method of classifying data in a group into subgroups and transmitting the data in parallel will be described.

In this case, as shown in FIG.
The band of the ream is further classified into subgroups based on the data in the group, and each subgroup is transmitted by a different Sub-Thread. The subgroups are transmitted simultaneously in parallel. As for the allocation of the transmission band between the sub-threads, the transmission method in which the transmission cycle is synchronized between the sub-threads as described in the second and third embodiments and the transmission rate between the sub-threads are the same. Such a transmission method can be selected.

The transmission method of files and data in the Sub-Thread is simply a sequential transmission method or a Sub-Thread transmission method.
It is possible to select a transmission method such as transmitting the Thread further separated into Sub-Sub-Threads. Figure 5 shows Sub-Thread
The figure shows an example in which file transmission is performed sequentially in the inside.

Since the transmission rate of each Sub-Thread is reduced by such multiplexing, when the bandwidth is wide (at a high bit rate), the processing amount on the receiving device side is reduced.

Further, when the mutual relevance between the subgroups is small, it is possible to individually manage the sub-threads, and the management becomes easy (for example, only the contents of a specific sub-thread are changed). .

Next, as a fifth embodiment, a method of transmitting important data in parallel at a high rate and other data in a low rate will be described.

In this case, as shown in FIGS. 6 and 7, when the files and data in the data group to be transmitted can be classified into important data and non-important data, for example, when the files and data have a hierarchical structure, the important data is compared. The other data is transmitted in parallel at a relatively low rate.

The fast rate and the slow rate can be realized by dividing the transmission rate of the same Thread, or the fast rate can be realized by using a special Thread.

The method of transmitting files and data in the high-rate portion and the low-rate portion can be either sequential or parallel.

FIGS. 6 and 7 show examples in which the fast rate portion is transmitted by only one file and the slow rate portion is transmitted sequentially. FIG. 6 shows the case where the transmission rate of the same Thread is changed. FIG. 7 shows an example in which a special Thread transmission area is used at a high rate.

By such multiplexing, important parts for acquiring files and data such as directory information and DownloadInfoIndication are transmitted at a high rate while files and data to be transmitted have a directory structure, and other files and data are slow. When transmitting at the rate, the directory information and DownloadInfo can be
Since the Indication can be obtained quickly, the time required to obtain the directory information and DownloadInfoIndication and to obtain some necessary files from the information can be shortened. (If the directory information and DownloadInfoIndication are sufficiently small compared to the total information amount, Since the transmission cycle of other data groups hardly increases because it is conceivable).

In the case where important parts such as core data necessary for the start of execution in a program or the like are transmitted at a high rate and other data is transmitted at a low rate, the transfer from the start of the download is performed without changing the total rate. The waiting time until program execution starts can be reduced.

Further, since the number of transmission repetitions of the important part of the data is increased, the data error resistance is also improved (this is effective when other data is data that allows an error such as an image).

The present invention is suitable for a program such as a Java class file that can transfer data in units of objects.

Next, as a sixth embodiment, a method of sequentially transmitting important data at a high rate and other data at a low rate will be described.

In this case, as shown in FIG. 8, heavy data is transmitted at a high rate using a special band, and other data is transmitted at a normal rate sequentially. The transmission cycle of important data can be shortened, and the number of repetitions can be increased.

By such multiplexing, the waiting time from the start of download to the start of program execution can be reduced.

Further, since the number of transmission repetitions of the important part of the data is increased, the data error resistance is also improved (this is effective when the other data is data that allows an error such as an image).

Further, it is suitable for a program such as a Java class file which can transfer data in units of objects.

Since the transmission rates of the other parts do not change, the number of repetitions and the total time until all files are obtained do not change.

Next, as a seventh embodiment, a method of shifting the transmission timing of a file or data will be described.

In this case, as shown in FIGS. 9 and 10, the transmission of each file or data is all synchronized, or the transmission of the next file is not started immediately after the transmission of the file is completed. The transmission of the next file is performed by shifting the synchronization of the transmission or adding a slight idle time (interleave) after the transmission of the file is completed.

FIG. 9 shows an example in which files and data in a data group having a directory structure are transmitted in parallel, and only directory information is out of synchronization with other files.

FIG. 10 shows an example in which files and data are sequentially transmitted and each file or data is interleaved and transmitted (different from packet-based interleaving).

When the file or data to be transmitted has a directory structure, the directory information is obtained on the receiver side,
In a case where a file in a directory is automatically acquired by a program or the like, time is required until directory information is acquired, analyzed, and control information for file acquisition is set. If a file is transmitted immediately after directory information transmission, the file acquisition operation cannot be completed in time.
However, if there is a Delay before the file is transmitted after the directory information transmission is completed, the control operation for starting the file acquisition can be completed during that time, and the file immediately after can be acquired.

In the case of acquiring files one by one, the control operation for starting acquisition of the next file from the end of acquisition of the file can be ended, and the acquisition of files can be continuously performed.

As described above, according to the transmission system of the present invention, when mutually related data is transmitted cyclically,
According to the type and structure of data, optimal transmission can be performed for each purpose such as substantial reduction of Download time, improvement of data error resilience, and reduction of receiver cost.

[0084]

According to the first aspect of the present invention, a plurality of data, such as directory information, which must be obtained first before obtaining another file can be provided in one traveling group. Therefore, the average of the time for acquiring such data can be shortened, and both the expected value and the maximum value of the time until the target file is acquired can be shortened.

When the directory information or the like is small enough for the file to be transmitted or when the number of files to be transmitted is large, the entire transmission loop cycle is not affected so much, so that the efficiency is increased.

Further, since the transmission method is simple, the transmission method can be easily realized.

According to the second aspect of the present invention, since the transmission rate of each file becomes low, when the bandwidth is wide (at a high bit rate), the amount of processing on the receiving device side can be reduced.

Further, since the transmission periods of all the files are synchronized, it is efficient in terms of time when successively acquiring files one by one.

According to the third aspect of the present invention, each Sub-Thre
Since the transmission rate of the ad becomes low, when the band is wide (at a high bit rate), the processing amount on the receiving device side can be reduced.

Further, when the mutual relevance between the subgroups is small, individual management can be performed in units of Sub-Threads. For example, when the contents are changed, only the contents of a specific Sub-Thread need be changed. Management becomes easier.

According to the fourth aspect of the present invention, the specific information data is transmitted using the dedicated band, so that the specific information can be received quickly, and the acquisition time of the desired data reception can be reduced. Can be shortened.

According to the fifth aspect of the present invention, since a dedicated band for transmitting specific information is used in a plurality of cyclic groups, the data transmission band can be effectively used.

Further, since the number of transmission repetitions of an important part of data is increased, data error resistance is also improved.

Further, it is suitable for a program such as a Java class file that can transfer data in units of objects.

According to the sixth aspect of the present invention, there is a delay time between the acquisition of one piece of information data and the acquisition of the next piece of information data. The operation can be terminated, and the file can be continuously obtained.

According to the seventh aspect of the present invention, a delay time is provided between the transmission of directory information and DownloadInfoIndication and the transmission of a normal file. By the time of acquisition, the file acquisition control operation can be completed, and acquisition can be performed on the immediately subsequent file.

According to the eighth aspect of the present invention, since the transmission rate of each file becomes low, when the bandwidth is wide (at a high bit rate), the processing amount on the receiving device side can be reduced.

Also, since the transmission speeds of all the sub-threads are the same, the rate control can be simplified.

According to the ninth aspect, it is possible to transmit a file such as directory information and DownloadInfoIndication or a portion important for data acquisition at a high rate, and to transmit other files and data at a low rate. Directory information and Downlo without changing rates
Since adInfoIndication can be obtained quickly, it is possible to reduce the time required to obtain directory information and DownloadInfoIndication and obtain some necessary files based on the information.

Also, when important parts such as core data necessary for the start of execution in a program or the like are transmitted at a high rate and other data is transmitted at a low rate, the transmission is started without changing the total rate. The waiting time until program execution starts can be reduced.

According to the tenth aspect of the present invention, the specific information data is transmitted using a dedicated band.
Specific information can be received quickly, and the acquisition time of desired data reception can be reduced.

According to the eleventh aspect of the present invention, a plurality of data such as directory information and DownloadInfoIndication which must be obtained first before obtaining other files can be provided in one traveling group. Therefore, the average of the time for acquiring such data can be shortened, and both the expected value and the maximum value of the time until the target file is acquired can be shortened.

When the directory information, DownloadInfoIndication, etc., for the file to be transmitted are sufficiently small, or when the number of files to be transmitted is large, the entire transmission loop cycle is not much affected, and the efficiency is increased.

Further, since the transmission method is simple, it can be easily realized by a transmission device.

According to the twelfth aspect of the present invention, since the transmission rate of each file becomes low, when the bandwidth is wide (at a high bit rate), the amount of processing on the receiving device side can be reduced.

Also, since the transmission periods of all the files are synchronized, it is efficient in terms of time when acquiring files one by one continuously.

According to the thirteenth aspect, each Sub-Th
Since the transmission rate of read becomes low, when the bandwidth is wide (at a high bit rate), the processing amount on the receiving device side can be reduced.

When the mutual relevance between the subgroups is small, individual management can be performed in units of Sub-Threads. For example, when the contents are changed, only the contents of a specific Sub-Thread need be changed. Management becomes easier.

According to the fourteenth aspect of the present invention, specific information data is transmitted using a dedicated band for transmission.
Specific information can be received quickly, and the acquisition time of desired data reception can be reduced.

According to the fifteenth aspect, a dedicated band for transmitting specific information is used in a plurality of cyclic groups, so that a data transmission band can be effectively used.

Further, since the number of transmission repetitions of the important part of the data is increased, the data error resistance is also improved.

Further, it is suitable for a program such as a Java class file that can transfer data in units of objects.

According to the sixteenth aspect of the present invention, there is a delay time between the acquisition of one piece of information data and the acquisition of the next piece of information data. Operation can be terminated,
It is possible to continuously obtain files.

According to the seventeenth aspect of the present invention, a delay time is provided between transmission of directory information and DownloadInfoIndication and transmission of a normal file. By the time of acquisition, the file acquisition control operation can be completed, and acquisition can be performed on the immediately subsequent file.

According to the eighteenth aspect of the present invention, since the transmission rate of each file becomes low, when the bandwidth is wide (at a high bit rate), the amount of processing on the receiving device side can be reduced.

Also, since the transmission speeds of all the sub-threads are the same, the rate control can be simplified.

According to the nineteenth aspect, it is possible to transmit a file such as directory information and DownloadInfoIndication or a portion important for data acquisition at a high rate, and to transmit other files and data at a low rate. Directory information and Down without changing rates
Since loadInfoIndication can be obtained quickly, it is possible to reduce the time required to obtain directory information and DownloadInfoIndication and obtain some necessary files based on the information.

Also, when important parts such as data of a core part necessary for the start of execution by a program or the like are transmitted at a high rate and other data is transmitted at a low rate, the transfer from the start of the download is performed without changing the total rate. The waiting time until program execution starts can be reduced.

According to the twentieth aspect, specific information data is transmitted by using a dedicated band.
Specific information can be received quickly, and the acquisition time of desired data reception can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a data broadcast transmitting device and a data broadcast receiving device according to the present invention.

FIG. 2 is an image diagram showing transmission data when a plurality of important data are provided in one transmission cycle of cyclic transmission.

FIG. 3 is an image diagram showing transmission data when all data in a group is transmitted in parallel (a data loop period synchronization type).

FIG. 4 is an image diagram showing transmission data when all data in a group is transmitted in parallel (when the data rate is constant).

FIG. 5 classifies data in a group into subgroups,
FIG. 9 is an image diagram showing transmission data when transmitting in parallel.

FIG. 6 is an image diagram showing transmission data when important data is transmitted in parallel at a high rate and other data is transmitted at a low rate in parallel.

FIG. 7 is an image diagram showing transmission data when important data is transmitted in parallel at a high rate and other data is transmitted in parallel at a low rate.

FIG. 8 is an image diagram showing transmission data when important data is sequentially transmitted at a high rate and other data is transmitted at a low rate.

FIG. 9 is an image diagram showing transmission data when the transmission timing of a file or data is shifted.

FIG. 10 is an image diagram showing transmission data when a transmission timing of a file or data is shifted.

FIG. 11 is an image diagram showing conventional cyclic transmission data.

[Explanation of symbols]

 1a, 1b storage, data source 2a, 2b, 2c serial multiplexing unit 3 transmission control unit 4a, 4b sub Thread multiplexing unit 5 Thread multiplexing unit 6 conversion unit to physical layer 7 conversion unit from physical layer 8 Thread Demux unit 9a, 9b, 9c Demux unit 10 Reception control unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsuyoshi Hanamura 2-4-1, Okubo, Shinjuku-ku, Tokyo Inside Media Glue Company (72) Inventor Kazuhiko Yoshii 2-4-2, Okubo, Shinjuku-ku, Tokyo Stock Company F-term in media glue (reference) 5K030 GA01 GA04 JL02 LA03 LA19 LD07 5K034 AA01 AA10 DD02 EE03 HH01 MM21

Claims (20)

[Claims] In a data broadcasting system for transmitting digital broadcasting, a cyclic group setting means for collectively setting a plurality of information data to be transmitted as one group, and cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. A data broadcasting system comprising: a traveling group setting unit that provides a plurality of identical information data in one traveling group. 2. A data broadcasting system for transmitting digital broadcasting, wherein a cyclic group setting means for setting a plurality of information data to be transmitted collectively as one group, and a cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. Means, and wherein the cyclic transmission means divides a transmission band so that all information data in the cyclic group is transmitted in one transmission cycle, and transmits the divided data simultaneously. 3. The data broadcasting system according to claim 1, wherein said cyclic group setting means sets a plurality of cyclic groups, and said cyclic transmitting means cyclically transmits each of said plurality of cyclic groups. A data broadcasting system characterized by causing a data broadcast. 4. The data broadcasting system according to claim 1, wherein said cyclic transmission means transmits said cyclic group using a normal band, and exclusively transmits said specific information data together with said normal band. A data broadcasting system for transmitting the specific information data by using also the band of (1). 5. The data broadcasting system according to claim 4, wherein said cyclic transmission means transmits a plurality of cyclic groups,
A data broadcasting system wherein the dedicated band is shared and used by a plurality of cyclic groups for transmitting specific information data. 6. The data broadcasting system according to claim 1, wherein said cyclic transmission means provides a delay time between transmission of information data and transmission of the next information data. 7. The data broadcasting system according to claim 2, wherein said cyclic group setting means includes normal information data and specific information data and sets them as one group, and said cyclic transmission means sets said specific information. A data broadcasting system, wherein after transmitting data, a delay time is provided to transmit the normal information data. 8. A data broadcasting system for transmitting digital broadcasting, wherein: a transmission rate setting means for making all transmission rates of information data to be transmitted constant; and each of said information data at a transmission rate set in said transmission rate setting means. And a cyclic transmission means for cyclically transmitting the data. 9. A data broadcasting system for transmitting digital broadcasting, wherein a cyclic group setting means for collectively setting a plurality of information data to be transmitted as one group, and a cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. Means, wherein the cyclic group setting means transmits a specific cyclic group having specific information data and a normal cyclic group composed of normal information data to the transmission cycle of the specific cyclic group. A cycle set to be shorter than a cycle, wherein the cyclic transmission means cyclically transmits the specific cyclic group and the normal cyclic group, respectively. 10. The data broadcasting system according to claim 9, wherein the cyclic transmission means preferentially transmits the specific cyclic group using a dedicated band, and excludes the normal cyclic group from the exclusive band. A data broadcasting system characterized in that transmission is performed using only a vacant band. 11. A data broadcasting method for transmitting a digital broadcast, wherein: a cyclic group setting step for setting a plurality of information data to be transmitted collectively as one group; and a cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. A data broadcasting method, comprising the steps of: (a) providing a plurality of identical information data in one traveling group; 12. A data broadcasting method for transmitting a digital broadcast, comprising: a cyclic group setting step for setting a plurality of information data to be transmitted collectively as one group; and a cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. A data broadcasting method, wherein the cyclic transmission step divides a transmission band so that all information data in the cyclic group is transmitted in one transmission cycle, and transmits the information data simultaneously. 13. The data broadcasting method according to claim 11, wherein the cyclic group setting step sets a plurality of cyclic groups, and the cyclic transmitting step cyclically transmits the plurality of cyclic groups, respectively. A data broadcasting method characterized by causing a data broadcast. 14. The data broadcasting method according to claim 11, wherein the cyclic transmission step causes the cyclic group to be transmitted using a normal band, and is exclusively used together with the normal band only when the specific information data is transmitted. A data broadcast method for transmitting the specific information data also by using the band. 15. The data broadcasting method according to claim 14, wherein the cyclic transmission step causes a plurality of cyclic groups to be transmitted, and the dedicated band is shared by a plurality of cyclic groups for transmitting specific information data. A data broadcasting method characterized by causing a data broadcast. 16. The data broadcasting method according to claim 11, wherein said cyclic transmission step comprises providing a delay time between transmission of information data and transmission of the next information data. 17. The data broadcasting method according to claim 12, wherein the cyclic group setting step includes normal information data and specific information data and is set as one group, and the cyclic transmission step includes the specific information. A data broadcasting method, wherein after transmitting data, the normal information data is transmitted with a delay time. 18. A data broadcasting method for transmitting a digital broadcast, comprising: a transmission rate setting step for making all transmission rates of information data to be transmitted constant; and each of the information data at the transmission rate set in the transmission rate setting step. A cyclic transmission step of cyclically transmitting the data. 19. A data broadcasting method for transmitting a digital broadcast, comprising: a cyclic group setting step of setting a plurality of information data to be transmitted collectively as one group; and a cyclic transmission for cyclically transmitting the set cyclic group as one transmission cycle. And wherein the cyclic group setting step comprises: transmitting a specific cyclic group having specific information data and a normal cyclic group including normal information data to the transmission cycle of the specific cyclic group. A data broadcast method, wherein the cyclic transmission step cyclically transmits the specific cyclic group and the normal cyclic group, respectively. 20. The data broadcasting method according to claim 19, wherein said cyclic transmission step causes said specific cyclic group to be preferentially transmitted using a dedicated band, and excludes said normal cyclic group from said dedicated band. A data broadcasting method characterized in that transmission is performed using only a vacant band.