JP3090076B2 - Broadcast control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast control system for performing control for determining a data transfer path when broadcasting the same data from a single transmitting station to a plurality of receiving stations.

[0002]

2. Description of the Related Art Conventionally, in this type of data broadcast transmission system, a router for processing the transmission (transmission / reception) of broadcast data in a loop by a dedicated line or the like is connected, and each of the routers is connected to a local area network ( A receiving station that receives broadcast data via the LAN (LAN) or the like and performs hard copy or screen output thereof is connected. In this data broadcasting system, control is performed to determine a data transfer path (path) that minimizes the total cost of a line required for data transfer in which the bandwidth and delay time of a path (line) between routers are quantified. , The broadcast data is being transferred.

FIG. 9 is a block diagram showing a configuration of a conventional data broadcast transmission system. In the data broadcasting system shown in FIG. 9, a transmitting station Tx and a router 0 are connected, and the router 0 and the routers 1, 2, 3, and 4 are connected in a loop by a line. In addition, LAN
For example, the receiving stations Rx1, Rx2, Rx3, and Rx4 are connected.

Next, the operation of this conventional example will be described. FIG. 10 is a diagram for explaining the transfer cost of broadcast data in the data broadcast transmission system shown in FIG.
FIG. 11 is a diagram for explaining a transfer cost of broadcast data of another example in the data broadcast transmission system.

In FIG. 9, FIG. 10 and FIG. 11, five routers 0 to 4 are connected in a loop by a line. In this case, the cost value between router 0 and router 1 is 11, and The cost value between the router 2 and the router 2 is 12.
The cost value between the router 2 and the router 3 is 13, and the cost value between the router 3 and the router 4 is 14.
Further, the cost value between the router 4 and the router 0 is 15.

In FIG. 9 and FIG. 10, when the broadcast data is transferred in the order of the router 0 to the router 2 and then to the router 4, there are two transfer paths, clockwise and counterclockwise. That is, there is a router 0 → router 1 → router 2 as a first transfer route. Further, the second transfer route includes router 0 → router 4 → router 3 → router 2. In this case, the total cost of the first transfer path is (11 + 1)
2 = 33), and the total cost of the second transfer path is (15 + 14 + 13 = 42).

[0007] Thus, the total cost of the first transfer path is smaller than the total cost of the second transfer path. Therefore, the transmitting station Tx (router 0) selects the first transfer path (line) and transmits the broadcast data to the receiving station Rx2 connected to the router 2 through the router 0 → the router 1.

Next, in FIG. 9 and FIG.
Also, when the broadcast data is transferred from the router to the router 4, there are two transfer paths, clockwise and counterclockwise. First, the first
Router 2 → router 1 → router 0 → router 4 Also, as the second transfer route, router 2 →
There is a router 3 → router 4. In this case, the total cost of the first transfer route is (12 + 11 + 15 = 38), and the total cost of the second transfer route is (14+
13 = 27).

That is, the total cost of the second transfer route is smaller than the total cost of the first transfer route. Therefore, the transmitting station Tx (router 0) selects the second transfer path and transmits the broadcast data to the receiving station Rx2 connected to the router 4 through the router 2 → the router 3.

[0010]

As described above, in the above-described conventional broadcast control system, a route (line) between routers is used.
A path that minimizes the total cost of a line for data transfer in which the bandwidth and delay time are quantified is determined and the data transfer is performed. However, in this case, there are the following problems.

[0011] The router determines the transfer path of the broadcast data from the total cost, and the transmitting station, which is the higher-level device, cannot recognize the transfer path of the broadcast data. That is, it is impossible to determine the transfer order of the broadcast data at the router (receiving station) and the transmission direction (clockwise or counterclockwise in a loop) from the transmitting station, which have the best broadcast data transfer efficiency.

FIG. 12 is a diagram showing a state in which the same broadcast data flows bidirectionally (overlapping) on the same line. As described above, the broadcast data overlaps on the same transfer path, so that the bandwidth cannot be effectively used.

FIG. 13 is a diagram showing a state where broadcast data once flowing flows on the same line. As described above, once broadcast data flows through the same transfer path, data transfer is delayed, and the transfer efficiency of the broadcast data is reduced.

The present invention solves such a problem in the prior art, and transfers broadcast data by effectively utilizing a bandwidth based on recognition of a transfer path of the broadcast data at a transmitting station. It is possible to determine the data transfer order and transmission direction of a router (receiving station) having the best efficiency, and to provide a broadcast control system in which the transfer of the broadcast data is speeded up and the transfer efficiency is improved. And

[0015]

To achieve the above object SUMMARY OF THE INVENTION The invention of Claim 1 wherein the Oite in one broadcast control system connected to the plurality of receiving stations in a loop via the transmitting station and line , The transmitting station transmits signals from a plurality of receiving stations.
Broadcast data in the transmission order and transmission direction from this transmitting station
The broadcast data including transfer order information for determining the transfer route of the data.
Transmission means for processing the transmission of data, and
The transmitting means to a destination receiving station based on the transfer order information
A router that sends out broadcast data by the processing of
The receiving station receives and transmits broadcast data from the line;
Transmitting and receiving means for transmitting and receiving a transfer by means of
Based on the transfer order information included in the broadcast data received through
To determine the receiving station of the transfer destination.
A router that forwards broadcast data by means of means
And between the routers of the transmitting station and the receiving station.
By setting the same cost value of the transmission path, the transmitting station determines the transmission order and the transmission direction from the transmitting station in the plurality of receiving stations having the best transfer efficiency of broadcast data, and based on this determination. Broadcast data of frame data including transfer order information is generated, the broadcast data is transmitted to the receiving station of the broadcast destination that is the first transmission destination, and the broadcast receiving unit receives the broadcast data. The station sequentially transfers broadcast data to the next receiving station on the basis of transfer order information.

A broadcast control system according to claim 2 is
The broadcast data of the frame data includes broadcast destination identification information and a broadcast data main body, and further includes, as broadcast destination identification information, an address of a first broadcast destination receiving station and another data to be sequentially transferred. The configuration has the address of the receiving station.

A broadcast control system according to claim 3 is
The transmission / reception means and the router are connected by a local area network.

[0018] In the above broadcast control system is preferably provided with a terminal adapter that connects the router and the line.

In the broadcast control system, it is preferable that a dedicated line is used as the line.

In the broadcast control system having such a configuration, the cost value of the transfer path between the routers provided in the transmitting station and the receiving station is set to be the same, and the transmitting station has the best broadcast data transfer efficiency. The transmission order of the broadcast data and the transmission direction in the clockwise or counterclockwise direction on the transfer path connected in a loop are determined. Frame data (broadcast data) including transfer order information based on this determination is generated, and the broadcast data is transmitted to the first receiving station of the broadcast destination. The receiving station receiving the broadcast data sequentially transfers the broadcast data to the next receiving station based on the transfer order information.

[0021] Thus, based on the recognition of the transfer path of the broadcast data at the transmission station, the data transfer sequence and the transmission direction of the router transfer efficiency of the broadcast data is the best (the receiving station) is determined. In addition, as described in the related art, broadcast data does not overlap on the same transfer path (line), and the bandwidth can be effectively used. Further, the broadcast data once flowing does not flow through the same transfer path, and the transfer of the broadcast data is not delayed. As a result, the transfer of the broadcast data is speeded up, and the transfer efficiency of the broadcast data is improved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the broadcast control system of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a broadcast control system according to an embodiment of the present invention. The broadcast control system shown in FIG. 1 includes a transmitting station 710 for transmitting broadcast data, and N receiving stations 720 connected to the transmitting station 710 via a dedicated line and performing transmission / reception processing for transferring the broadcast data. , 73
0 ... 740. The transmitting station 71
. 740 are connected in a loop.

The transmitting station 710 includes a local area network (LAN) 711, a transmitting device 715 for transmitting broadcast data connected by the LAN 711, and a transmitting device 7.
15 based on the transfer order information from the receiving station 72
Router 71 for transmitting broadcast data to 0,730 ... 740
4 and terminal adapters TA712 and TA713 for processing the connection between the router 714 and the line end.

[0024] The receiving station 720 to 740, respectively LAN
721, 731, 741 and the LAN 7
21, 735, 74 which are connected to 21, 731, 741 and process transmission and reception of broadcast data
Five. Further, the destination receiving stations 720, 730,... 74 based on the transfer order information from the transmitting device 715.
Routers 724 and 73 for transferring broadcast data to 0
4,744. Also, this router 724, 7
Terminal adapters TA722, TA723, TA732, and TA73 for processing connections between 34,744 and line ends
3, TA742 and TA743.

FIG . 2 is a diagram showing the contents of a data frame to be transferred. As shown in FIG. 2, the data frame (broadcast data) has broadcast destination identification information and a broadcast data body. The broadcast destination identification information is composed of the address of the receiving station that is the first broadcast destination, the address of the receiving station that is the second broadcast destination, the address of the receiving station that is the third broadcast destination, and so on. ing.

Next, the operation of this embodiment will be described. FIG. 3 is a diagram for explaining a first example of a broadcast data transfer path. In FIG. 3, the receiving stations 720, 730,... 740 in the configuration shown in FIG.
In addition, the router 714 is set to the router 0, and the router 72 is set to the router 72.
4, 744, 744 will be described as routers 1, 2,. Note that the cost values of the respective transfer routes between the routers 0 to N are set to be the same.

Furthermore, 1 to the receiving station for transmitting broadcast data
N, the receiving stations (1 to 1) having the largest total cost of the clockwise transfer path from the transmitting station 710 to the receiving stations (1 to N)
N) is the receiving station i, and the receiving stations (1 to N) having the maximum total cost of the counterclockwise transfer path are the receiving stations (N-j).

[0028] Hereinafter, a first transfer path example, broadcast data transfer path and a receiving station for receiving the order of (1 to N) was determined as shown below, and transfers the broadcast data. This first transfer path example is j> i and i ≦ (N / 2) and j ≧ (N /
In the case of 2), as shown in FIG. 3, the transmitting device 715 of the transmitting station 710 sets the receiving order of the receiving stations (1 to N) in the clockwise direction, receiving station (N−j) →... Receiving station (i). A data frame (broadcast data) is created by adding the broadcast destination identification information, which is the destination information, to the body of the broadcast data. The transmitting station 710 transmits the broadcast data to the receiving station (N-j) which is the first broadcast destination (transmission destination).

Since the cost value between all the routers 0 to N is constant, the broadcast data is transmitted in a clockwise transfer route having a small total cost of the transfer route, that is, router 1 → router 2 → router (N−j). Route. When the receiving station (N-j) receives the broadcast data, the receiving station (N-j)
Refers to the broadcast destination identification information in the data frame shown in FIG.
To the broadcast data.

[0030] repeating the transfer of broadcast data by such a relay system. Since the broadcast data has the same cost value of the transfer route between routers 0 to N, router 1 → router 2.
→ Router (i-1) → Transfer clockwise from router (i), and receive station (N−j) →... → Transfer to receive station i in the clockwise order of receiving station i.

FIG . 4 is a diagram for explaining a second example of the transfer route of broadcast data. This second transfer path example is j <
This is the case where i and i ≧ (N / 2) and j ≦ (N / 2). The transmitting device 715 of the transmitting station 710 includes receiving stations (1 to 1).
N) The receiving station i in which the receiving order is counterclockwise is the receiving station (N
−j), a data frame (broadcast data) is created by adding the broadcast destination identification information shown in FIG. 2 to the broadcast data body. The transmitting station 710 transmits the broadcast data to the receiving station i, which is the first broadcast destination.

Broadcast data is sequentially transferred to the router N → router (N−1) → router (N−2)... → router (i) on the counterclockwise transfer route where the total cost of the transfer route is the minimum. You. When the receiving station i receives the broadcast data, the receiving station i refers to the broadcast destination identification information shown in FIG. 2 and transfers the broadcast data to the receiving station that is the second broadcast destination.

The transfer by the relay system is repeated. Since the broadcast data has the same cost value of the transfer route between the routers 0 to N, the router N → the router (N
-1) → Router (N-1) ... → Router (Nji) →
The data is transferred by the router (N-j). That is, the broadcast data is received in the order of the counterclockwise receiving station i →... → the receiving station (N−j).

FIG . 5 is a diagram for explaining a third example of the transfer route of broadcast data. This third transfer path example is i ≧
(N / 2) and j ≧ (N / 2). Transmitting station 7
The ten transmitting devices 715 change the receiving order of the receiving stations (1 to N) from the receiving station (N-j) to the receiving station (N / 2-1).
A data frame (broadcast data) in which the broadcast destination identification information shown in FIG. 2 is added to the broadcast data body is created. The transmitting station 710 transmits the broadcast data to the receiving station (N-j) which is the first broadcast destination.

[0035] router of the broadcast data is clockwise transfer route total cost of the transfer path is a minimum 1 → router 2 ...
→ The data is sequentially transferred to the router (N-j). Upon receiving the broadcast data, the receiving station (N-j) refers to the broadcast destination identification information shown in FIG. 2 and transfers the broadcast data to the receiving station that is the second broadcast destination.

[0036] By repeating the transfer by these relay system, the broadcast data because the cost value of the transfer path between routers 0~N are identical, clockwise Router 1 → Router 2 → router ... → Router (N / Transferred in 2-1).
That is, the broadcast data is received in the order of the clockwise receiving station (N-j) →... → the receiving station (N / 2-1).

[0037] The receiving station i → ... receiving station receiving the order of the transmission device 715 is the receiving station of the transmission station 710 (1~N) (N /
2), a data frame (broadcast data) is created by adding the broadcast destination identification information shown in FIG. 2 to the broadcast data body. The transmitting station 710 transmits the broadcast data to the receiving station i, which is the first broadcast destination.

[0038] The broadcast data is transferred in the transfer path of the router N → router (N-1) → router (N-2) ... → router i in the counterclockwise direction of transfer path total cost of the transfer path is at a minimum Is done. Thus, when receiving the broadcast data, the receiving station i refers to the broadcast destination identification information shown in FIG. 2 and transfers the broadcast data to the receiving station which is the second broadcast destination.

[0039] By repeating the transfer by these relay system, broadcast for data cost value of the transfer path between routers 0~N are identical, counterclockwise router N → router (N-1) → router ( N-2) ... → router (N /
Transferred in 2). That is, the counterclockwise receiving station i →
... → Broadcast data is received in the order of receiving station (N / 2).

Next, the receiving station illustrating the transmission of the broadcast data when the six stations. FIG. 6 is a block diagram showing the configuration of the broadcast control system when there are six receiving stations. In FIG. 6, a transmitting station 7 for transmitting broadcast data, and receiving stations 1, 2, 3, 4, 5, and 6 connected to the transmitting station 7 via a dedicated line and performing transmission / reception processing of broadcast data. They are connected in a loop.

The transmitting station 7 includes a local area network (LAN) 72, a data transmitting device 71 for transmitting broadcast data connected by the LAN 72, and a router 73.
Terminal adapters (TA) 74 and 75 for processing the connection between the router 73 and the line end are provided.

The receiving station 1-6 are each the same structure, have a LAN12,22,32,42,52,62, further, the data transceiver being coupled to the LAN12～62 11, 21, 31 , 41, 51, 61 and routers 13, 23, 33, 43, 53, 63. Also, terminal adapters (TAs) 14, 15, 24, which process the connection between the routers 13 to 63 and the line ends,
25, 34, 35, 44, 45, 54, 55, 64, 6
Five.

The terminal adapter 75 of the transmission station 7 is connected with the terminal adapter 14 and the line 1 of the receiving station 1, the terminal adapter 15 of the receiving station 1 and the terminal adapter 24 of the receiving station 2 is connected with the line 2. Receiving station 2
Is connected to the terminal adapter 34 of the receiving station 3, and the terminal adapter 35 of the receiving station 3 and the terminal adapter 44 of the receiving station 4 are connected by the line 4.

[0044] In addition, the terminal adapter 45 of the receiving station 4
And the terminal adapter 54 of the receiving station 5 are connected by lines 5 and 6. Further, the terminal adapter 55 of the receiving station 5 is connected to the terminal adapter 64 of the receiving station 6 via the line 7, and the terminal adapter 65 of the receiving station 6 and the terminal adapter 74 of the transmitting station 7 are connected via the line 8. That is, the transmitting station 7 has the receiving station 1 to the receiving station 6 connected in a loop through the lines 1 to 8. In addition,
The cost values of the transfer paths between the routers 73 and 13 to 63 are all set to the same value.

Next, a description will be given of the operation of this configuration.
First, the operation when the broadcast destination is the receiving stations 1 and 3 will be described.
In FIG. 6, since the cost values of the transfer routes are all set to be the same between the routers 73 and 13 to 63, the clockwise transfer route from the transmitting station 7 to the receiving stations 1 to 6 in the broadcast destination is set. The receiving station (1 to 6) having the highest total cost is the receiving station 3
It is. The receiving station (1 to 6) having the largest total cost of the counterclockwise transfer path is the receiving station 1. As a result,
As described with reference to FIGS. 1 to 5, the receiving stations (1 to 6) having the maximum total cost of the clockwise transfer path are the receiving stations i = 3, and the total cost of the counterclockwise transfer path is the highest. The receiving stations (1 to 6) have the receiving station j = 6. Further, the receiving station N = 6, and the relations j> i and i ≦ (N / 2) and j ≧ (N / 2) hold.

[0046] Thus, the data transmission apparatus 71 of the transmitting station 7, broadcast destination identification information indicating the reception order of the received station (1-6) in FIG. 2, the receiving station 1 → receiving station 3 is clockwise Is added to the broadcast data body to generate a data frame (broadcast data). The broadcast data is transmitted by the data transmitting device 71 of the transmitting station 7 to the receiving station 1 which is the first broadcast destination.

[0047] Here, the cost value of the transfer path between the router 73,13～63 are all set to the same, the router 73, the transmission station 7 the broadcast data is the minimum transfer path total cost The broadcast data is transmitted from the terminal adapter 75 to the terminal adapter 14 of the receiving station 1, and the broadcast data is transferred to the data transmitting / receiving device 11 of the receiving station 1 through the router 1. The data transmitting / receiving device 11 of the receiving station 1 that has received the broadcast data analyzes the broadcast destination identification information shown in FIG. 2 and recognizes that the next transmission destination (broadcast destination) is the receiving station 3. . Further, a data frame (broadcast data) in which the broadcast destination identification information is added to the broadcast data body is generated,
The data is transferred to the receiving station 3 which is the broadcast destination.

[0048] Similarly, the router 1 (13), router 7
Since the cost values of the transfer routes between 3, 13 and 63 are all set to the same value, the broadcast data is transferred through the clockwise transfer route having the minimum total cost. That is, from the terminal adapter 15 of the receiving station 1 to the router 2 of the receiving station 2
Transfer to the receiving station 3 through (23). Therefore, the broadcast data is transferred in the order of router 1 (13) → router 2 (23) → router 3 (33).

FIG . 7 is a diagram for explaining the operation when the broadcast destinations are the receiving stations 4 and 5. In FIG. 7, the router 7
Since the cost values of the transfer routes between 3, 13 and 63 are all set to the same value, the transmitting station 7 in the broadcast destination receives the
The receiving station (1 to 6) having the largest total cost of the clockwise transfer path from (1) to (6) is the receiving station 5. Also, the receiving stations (1 to
6) is a receiving station 4.

[0050] As a result, i = 5, j = 3 , N = 6 , and the relationship of j <i and i ≧ (N / 2) and j ≦ (N / 2) is satisfied. Thereby, the data transmitting apparatus 71 of the transmitting station 7 changes the receiving order of the receiving stations (1 to 6) from the receiving station 5 to the receiving station 4 in the counterclockwise direction, and the broadcast destination identification information shown in FIG. A data frame (broadcast data) added to the broadcast data body is generated, and the broadcast data is transmitted by the data transmitting device 71 of the transmitting station 7 to the receiving station 5 as the first broadcast destination.

Further , since the cost values of the transfer routes between the routers 73 and 13 to 63 are all set to the same value, the router 73 transfers the broadcast data to the transfer route with the minimum total cost, ie, in the counterclockwise direction. The transfer is performed from the terminal adapter 74 of the transmitting station 7 to the receiving station 5 through the line 7. The data transmitting / receiving device 51 of the receiving station 5 that has received the broadcast data analyzes the broadcast destination identification information shown in FIG.
It recognizes that the next broadcast destination is the receiving station 4. And
A data frame (broadcast data) in which the broadcast destination identification information is added to the broadcast data body is generated, and the broadcast data is transmitted to the receiving station 4, which is the second broadcast destination.

[0052] Similarly, the cost value of the transfer path between the router 73,13～63 are all set to the same,
The router 5 (53) of the receiving station 5 transfers the data through a counterclockwise transfer path having the minimum total cost. That is,
The signal is transmitted from the terminal adapter 54 of the receiving station 5 to the receiving station 4 via the line 6. Thus, the broadcast data is transmitted to the router 6
The data is transferred in the order of → router 5 → router 4.

FIG . 8 is a diagram for explaining the operation when the broadcast destination is the receiving stations 2, 3, and 5. Also in the case of FIG. 8, since the cost values of the transfer paths between the routers 73 and 13 to 63 are all set to the same value, the clockwise transmission from the transmitting station 7 to the receiving stations (1 to 6) in the broadcast destination is performed. The maximum total cost of the transfer path is the receiving station 5, and the maximum total cost of the counterclockwise transfer path is the receiving station 2.

[0054] Consequently, as described with a through 5 1, i = 5, j = 5, N = 3 becomes, i ≧ (N /
2) The relationship of j ≧ (N / 2) holds. As a result, the data transmitting device 71 of the transmitting station 7 changes the receiving stations (1 to 6).
The broadcast destination identification information in which the receiving order in (1) is clockwise in the receiving station 2 → the receiving station 3 is added to the broadcast data to generate a data frame (broadcast data). The broadcast data is transmitted from the data transmitting device 71 of the transmitting station 7 to the receiving station 2 which is the first broadcast destination.

Further, since the cost values of the transfer routes between the routers 73 and 13 to 63 are all set to the same value, the router 73 transfers the broadcast data to the transfer route with the minimum total cost, ie, clockwise. The data is transferred from the terminal adapter 74 of the transmitting station 7 to the receiving station 2 through the receiving station 1.
The data transmitting / receiving device 21 of the receiving station 2 receiving the broadcast data analyzes the broadcast destination identification information shown in FIG. 2 and recognizes that the next broadcast destination is the receiving station 3, and A data frame (broadcast data) in which the identification information is added to the broadcast data body is generated and transferred to the receiving station 3, which is the second broadcast destination.

[0056] In the same manner, the transfer path of the broadcast data from the receiving station 2 to the receiving station 3, the cost value of the transfer path between the router 73,13～63 are all set to the same, the total cost Clockwise, which is the minimum. That is,
The signal is transmitted from the terminal adapter 25 of the receiving station 2 to the receiving station 3 via the line 3.

[0057] The data transmitting apparatus 71 of the transmitting station 7,
A data frame (broadcast data) in which the broadcast station identification information shown in FIG. 2 is added to the broadcast data body, where the receiving order of the receiving stations (1 to 6) is the receiving station 5, is generated. The broadcast data is transmitted from the data transmitting device 71 of the transmitting station 7 to the receiving station 5 which is the first broadcast destination.

[0058] Furthermore, the cost value of the transfer path between the router 73,13～63 are all set to the same, the broadcast data is the total minimum cost of the transfer path, i.e.,
In the counterclockwise direction, transfer from the terminal adapter 74 of the transmitting station 7 to the receiving station 5 through the receiving station 6 is performed.

By these controls, the bandwidth of the line can be used to the maximum and the broadcast data can be transferred with the shortest transfer time.

[0060]

As is apparent from the above description, according to the broadcast control system of the present invention, the cost values of the transfer paths between the routers provided in the transmitting station and the receiving station are set to the same value. The transmitting station determines the transmission order of the broadcast data having the best broadcast data transfer efficiency and the transmission order information which determines the clockwise or counterclockwise transmission direction on the transfer path connected in a loop, based on the transfer order information. Data is sequentially transferred from the first broadcast receiving station to the next receiving station.

[0061] Thus, based on the recognition of the transfer path of the broadcast data at the transmission station, the data transfer sequence and the transmission direction of the router (the receiving station) transfer efficiency of the broadcast data is the best is determined, the same transfer Broadcast data does not flow over a route (line) in an overlapping manner, and bandwidth can be effectively used. Furthermore, once broadcast data stops flowing along the same transfer path, and the transfer of broadcast data does not delay,
Broadcast data transfer is speeded up, and broadcast data transfer efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a broadcast control system according to an embodiment of the present invention.

FIG. 2 is a diagram showing contents of a data frame (broadcast data) to be transferred in the embodiment.

FIG. 3 is a diagram illustrating an example of a first transfer path of broadcast data according to the embodiment;

FIG. 4 is a diagram illustrating a second example of a transfer path of broadcast data according to the embodiment;

FIG. 5 is a diagram illustrating a third example of a transfer path of broadcast data according to the embodiment;

FIG. 6 is a block diagram illustrating a configuration of a broadcast control system when the number of receiving stations is six in the embodiment.

FIG. 7 is a diagram illustrating an example where two broadcast receiving stations are consecutive;
It is a figure for explaining operation in the case of a station.

FIG. 8 is a diagram for explaining an operation in a case where three broadcast receiving stations are discontinuous in the embodiment.

FIG. 9 is a block diagram showing a configuration of a conventional data broadcast transmission system.

10 is a diagram for explaining a transfer cost of broadcast data in the data broadcast transmission system shown in FIG. 9;

FIG. 11 is a diagram for explaining a transfer cost of another example of broadcast data in the data broadcast transmission system shown in FIG. 9;

FIG. 12 is a diagram showing a state in which the same broadcast data flows bidirectionally (overlapping) on the same line in a conventional example.

FIG. 13 is a diagram showing a state in which broadcast data once flowing in the conventional example flows on the same line.

[Description of Signs] 710 Transmitting Stations 711, 721, 731, 741 Local Area Network 712, 713, 722, 723, 732, 733, 7
42,743 Terminal adapter 714,724,734,744 Router 715 Transmitter 720,730 ... 740 Receiving station 725,735,745 Transmitter / receiver

Claims (3)

(57) [Claims] 1. A plurality of receptions through one transmission station and a line
Placed broadcast control system connected station to loop
The transmitting station may determine the transmission order at the plurality of receiving stations and
The broadcast data transfer path in the transmission direction from the transmitting station
The transmission of the broadcast data including the transfer order information to be determined is processed.
Transmission means to be processed and transfer order information from the transmission means.
To the destination receiving station based on the processing of the transmitting means.
A router for transmitting broadcast data, wherein the receiving station receives the broadcast data from the line and transmits the data.
Transmitting and receiving means for transmitting and receiving a transfer by means of
Based on the transfer order information included in the broadcast data received through
To determine the receiving station of the transfer destination.
A router that forwards broadcast data by means of means
And, Kos transfer path between the router of the transmitting station and the receiving station
The transmission station determines the transmission order and the transmission direction from the transmission stations in the plurality of reception stations having the best transmission efficiency of broadcast data by setting the same transmission value, and the transmission order information based on this determination is determined. To generate the broadcast data of the frame data containing the broadcast data, transmit the broadcast data to the receiving station of the broadcast destination which is the first transmission destination, and transmit the broadcast data to the receiving station which has received the broadcast data. A broadcast control system for sequentially transmitting broadcast data to the next broadcast destination receiving station based on order information. 2. The broadcast control system according to claim 1, wherein the broadcast data of the frame data includes broadcast destination identification information and a broadcast data body, and the broadcast data includes a broadcast destination identification information. A broadcast control system having an address of a first broadcast destination receiving station and an address of another receiving station to which data is sequentially transferred. 3. The broadcast control system according to claim 1 , wherein said transmission / reception means and said router are connected by a local area network.