JPH07162457A - Data transmission system - Google Patents

Abstract

PURPOSE:To obtain the data transmission system which is highly reliable and has the traffic of trunk lines suppressed to a certain value by sending the same data to plural fixed paths. CONSTITUTION:Plural fixed paths are set between an originating stations and a terminating station R, the same data are sent to the fixed paths 11, 12, and 13, and repeating stations A-D send the data in order on the basis of the header parts of the data or previously set fixed path information, thereby delivering the data to the terminating station R by using the fixed paths. Therefore, even if data are lost on one path, data from other paths can be sent to the terminating station to enable data transmission which are highly reliable and has the traffic of the trunk lines suppressed to a certain value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system for delivering data to be transmitted from a transmission side to a reception side in a data transmission network such as packet communication.

[0002]

2. Description of the Related Art Conventional Example 1. In a conventional data transmission network, when there are multiple relay stations between a source station and a destination station that transmit and receive data, each relay station receives all data that is not addressed to itself and all adjacent neighbors connected to it. Copy the data to the station (excluding the adjacent station that received the data),
Send. FIG. 9 shows its configuration. In this figure, S is a transmitting station, R is a receiving station, and A to D are relay stations.

Next, the operation will be described. First, the transmitting station S
Outputs data to the adjacent stations A and B connected to this station. Next, from the relay station A, the adjacent station B connected to this station,
Data is output to C and D, and similarly, data is output from the relay station B to the adjacent stations A, C and D connected to this station. Next, from the relay station C, the adjacent stations A, B, D, which are connected to this station,
Data is output to R, and similarly, data is output from the relay station D to the adjacent stations A, B, C, and R connected to this station. As a result, the data from the transmitting station S arrives at the receiving station R.

Conventional example 2. Further, FIG.
It is a figure showing the information frame format of the conventional transmission system disclosed by No. 462. In the figure, 101 is an information transmitting station number representing a transmitting station, 102 is a serial number in the information transmission order, 103 is a receiving station number, and 104 is data. Further, this system is similar to FIG. 9 in that a transmitting station for transmitting information, a plurality of relay stations for relaying and transmitting the information transmitted from the transmitting station, connected through the transmitting station relay line, and transmitting information through the relay line. A receiving station for receiving is provided, and a plurality of routes are provided between the calling station and the receiving station.

In this transmission method, the serial number 102 in the information transmission order shown in FIG. 10 is assigned as a management number to the information created in the transmitting station, and this information is transmitted to all the connected relay lines, and the relay station transmits the information. Check the control number of the information, delete the received information if it is information that has been received before, and if it is information that has never been received, connect all to connect the received information to the next station. To the trunk line. Then, the data is transmitted up to the called station whose called station number matches. In this example, by checking the management number of the information, the data is sent to the route connected to the relay station.

[0006]

In the data transmission method shown in the first conventional example, since the same data makes at least one round trip on all the routes connecting the relay stations as described above, the route between the relay stations is The data traffic (hereinafter referred to as a trunk line) is more than doubled for each data. Furthermore, adding new data transmission to these relay stations will further increase the traffic on the relay line. As a result, there is a problem that a transmission wait occurs on the relay line and a data transmission delay time from the transmission station to the reception station increases.

In the data transmission method shown in the second conventional example, the received information is erased when the information has been received before, and the received information is relayed to the next station when the information has never been received. In order to do so, it is sent to all connected trunk lines. Therefore, the data traffic is reduced as compared with the conventional example 1, but the information that has never been received is sent to all the relay lines, and thus there is the same problem as the conventional example 1.

The present invention has been conceived in order to solve the above problems, and relays by setting a plurality of routes including a relay station between a source station and a destination station in advance. It is an object of the present invention to provide a data transmission method that does not increase the traffic of a line.

[0009]

A data transmission system according to the present invention sets a plurality of fixed routes from a source station to a destination station, and sets a relay line in a relay station according to route information corresponding to the fixed route in the data. The data is selected, the data is sent to the relay line, and the data is transmitted to the destination station via a fixed route.

The relay station stores the route corresponding to the route information.

Also, the route transmitted by the transmitting station is set as the data to be transmitted and the same data is transmitted to a plurality of routes, and the relay station sees the route information of the transmitted data and receives the data. It is transmitted to the station.

Further, the relay station deletes the already used route information in order and transmits the data based on the updated route information.

[0013]

In the data transmission system of the present invention, route information for each route is added to the data to be transmitted to a plurality of fixed routes, and each relay station transmits the data, so that the traffic volume of each relay line is not increased. It is possible to keep the traffic volume below a certain level determined by the fixed route that was initially set.

Further, in the relay station, since the route is stored corresponding to the route information, it is not necessary to add detailed information regarding the route to the data to be sent, so that the data amount can be reduced.

Further, in the data transmission system of the present invention, the transmitting station adds the route information designating the route order to the data to be transmitted and transmits the data to a plurality of routes, and the relay station is designated based on the route information. Send data to the next station in the order of route.

Further, the relay station sequentially deletes the route information that has already been used. Therefore, the relay station determines the next station from the remaining route information and transmits the data.

[0017]

EXAMPLES Example 1. FIG. 1 shows an example of a data transmission network to which the present invention is applied. The data transmission system in this network has a route from a source station to a destination station as a plurality of predetermined fixed routes in a source station and a relay station. . In the figure, la to ld are relay stations A to D,
ls is a source station S and lr is a destination station R. 11 is a fixed route 1 (S-A-C-R), 12 is a fixed route 2 (S-B-R).
C-R) and 13 are fixed routes 3 (S-B-D-R). lsa is a relay line SA between the source station S and the relay station A,
Isb is a relay line SB between the transmitting station S and the relay station B, and similarly, lab is a relay line AB, lac is a relay line AC, l
bc is the trunk line BC, lba is the trunk line BD, lad is the trunk line AD, lcd is the trunk line CD, and lcr is the trunk line CR. Reference numeral 14 indicates a header portion of data, where n is a call number and is associated with a fixed route number on a one-to-one basis.

FIG. 2 is a destination table of data preset in each station. 2s is for the originating station S and 2a is for the relay station A.
, 2b for relay station B, 2c for relay station C, 2d for relay station D, 2r for destination station R. In addition, a relay line to be transmitted is set in each of the destination tables.

Next, the operation will be described. In FIG. 1, the data generated at the transmitting station S is copied as three data, and the call numbers 11, 12, and 13 are added to the header section 14, respectively. Subsequently, the data of the call number 11 is transferred to the relay line SA according to the transmission station destination table 2s shown in FIG.
Sent to. Similarly, the data of the call number 12 is the trunk line SB.
To the trunk line SB. Then, the data of the call number 11 received by the relay station A is sent to the relay line AC according to the destination table 2a for the A station.
Similarly, the data of the call number 12 received by the relay station B is sent to the relay line BC according to the transmission destination table 2b for the B station, and the data of the call number 13 also received by the relay station is sent to the relay line BD. Subsequently, the data of the call number 11 received by the relay station C is sent to the relay line CR according to the destination table 2c for C station, and the data of the call number 12 is also sent to the relay line CR. Subsequently, the data of the call number 13 received by the relay station D follows the relay line DR according to the destination table 2d for the D station.
Sent to. In this way, the data of the call numbers 11, 12, and 13 sent from the calling station S arrive at the called station R via three fixed routes.

As described above, in the first embodiment, a plurality of fixed routes are set between the source station and the destination station for transmitting / receiving data, and the relay station between them sets the header section of the data to be transmitted. It is characterized in that the fixed route is determined and data is transmitted to an adjacent station according to the route. In addition, a plurality of call numbers for transmitting data from the calling station to the called station are set in advance as the same fixed route number, and the data generated from the calling station are simultaneously set to a plurality of identical data according to the preset fixed route number. Is transmitted. This embodiment is different from the conventional example in that a plurality of fixed routes are set. Further, since a plurality of fixed routes are set, it is possible to prevent data retransmission and data transmission delay even if any one of the relay lines fails.

Example 2. In the first embodiment, the transmission band of the trunk line is used as one transmission line without being divided, but the transmission band may be frequency-divided into a plurality of channels.
FIG. 3 is a data transmission line having the same network configuration as that of FIG. 1, and the fixed route corresponding to the call number 11 is CH1 of the relay line SA, CH1 of the relay line AC, and CH of the relay line CR.
1 and a fixed route corresponding to the call number 12 is formed by CH2 of the trunk line SB, CH1 of the trunk line BC, and CH of the trunk line CR.
2, the fixed route corresponding to the call number 13 is CH1 of the trunk line SB, CH1 of the trunk line BD, and CH of the trunk line DR.
And CH1 of the trunk line DR. At this time, each relay station relays data according to the channel connection information 5a, 5b, 5c, 5d shown in FIG. As in the case of the first embodiment, the data generated by the transmitting station S is the call number 1 as three data.
1, 12, 13 and the call number 1 as shown in FIG.
1 is transmitted to CH1 of the relay line SA, then to the CH1 of the relay line AC at the relay station A in accordance with the channel connection information 5a shown in FIG. It is transmitted to CH1 of the trunk line CR according to the indicated channel connection information 5c and arrives at the terminating station R. Similarly, the data of the call number 12 arrives at the called station R from CH2 of the trunk line SB via CH1 of the trunk line BC and CH2 of the trunk line CR. Similarly, the data of the call number 13 arrives at the called station R from CH1 of the trunk line SB, CH1 of the trunk line BD and CH1 of the trunk line DR.

Example 3. Although the transmission band of each relay line is frequency-divided in the second embodiment, it may be time-divided into a plurality of channels. As shown in FIGS. 3 and 4, by connecting the channels of each relay line, a fixed route can be obtained. Therefore, the same operation as that of the second embodiment can be obtained. Figure 5
Shows a network diagram where this transmission band is time-divided.

Example 4. Although the call number is provided in the header part of the data and the relay line selection table is provided for each station in the first embodiment, the call number is provided in the header part of the data.
Fixed route information as shown in FIG. 6 may be provided, and the same operation as in the first embodiment can be obtained. In FIG. 6, 7
Reference numeral 1 is fixed route information corresponding to the call number 11, 72 is fixed route information corresponding to the call number 12, and 73 is fixed route information corresponding to the call number 13. Each fixed route information 71, 72,
Reference numeral 73 is composed of a relay station passing through and relay line information to be transmitted from the relay station.

The operation will be described with reference to the network diagram of FIG. For example, data corresponding to the call number 12 is transmitted from the transmitting station S to the relay station B, and when the relay station B receives this data, the relay of the table corresponding to the own station B of the fixed route information 72 in the header portion shown in FIG. The line BC is read and the data is sent to the trunk line BC. Then, when the relay station C receives this data, similarly, the relay line CR of the table corresponding to the own station C is read from the fixed route information 72 of the header portion of the data, and the data is sent to the relay line CR. Similarly, for the call numbers 11 and 12, the fixed route information 71, 73 is used to read the corresponding table of the data header section at each relay station and transmit the data. As described above, in the fourth embodiment, the data transmission system in which the fixed route information corresponding to the call number is provided in the header portion of the data, the header portion is read by the relay station, and the data is transmitted to the destination station has been described.

Example 5. In the fourth embodiment, an example in which the fixed route information corresponding to the call number is designated in the header part of the data is illustrated, but not limited to the fixed route, a plurality of routes that the user thinks are good are set according to the situation, The data may be transmitted to a plurality of routes.

Example 6. In the fourth embodiment, as shown in FIG. 6, the fixed route information is composed of the relay station to pass through and the relay line information to be sent from the relay station. However, as shown in FIG. May be arranged in order, and the same operation as that of the above-described fourth embodiment can be obtained by advancing and updating this relay line information at the time of data transmission at each relay station. In FIG. 7, 81 is fixed route information corresponding to the call number 11, 82 is fixed route information corresponding to the call number 12, and 83 is fixed route information corresponding to the call number 13.
For example, when data corresponding to the call number 12 is transmitted from the transmitting station S to the relay station B and the relay station receives this data,
The relay line information of the fixed route information 82 in the header part shown in FIG. 7 is read and the data is sent to the relay line BC. At this time, the table of the already used relay line BC in the fixed route information is deleted, and the data of FIG. The trunk line information is updated as in 92.
Subsequently, when the relay station C receives this data, it similarly sends the data to the relay line CR, but at this time, since there is no relay line next to the relay line CR, the fixed route information is updated with only the call number. In this way, data is transmitted from the source station S to the destination station R.
Since the unnecessary route information is deleted while arriving at, the relay station should always read the information written at the top as the information of the route to be transmitted next, and it is necessary to search the table. There is no.

[0027]

As described above, according to the present invention, data is duplicated at the transmitting station and a plurality of data are transmitted on fixed routes separately configured in the network. Can be set, and even if any one of the relay lines fails, data from the transmitting station is not lost, and highly reliable data transmission with little fluctuation in transmission delay can be maintained.

Further, since the relay station stores the route,
The originating station only needs to set the route information with which the fixed route can be identified.

Further, according to the present invention, since the transmission order of the transmitting station can be set in the data to be transmitted and transmitted, the route can be selected according to the situation, and the relay station can select the route. It also increases system scalability because it does not need to be remembered.

Further, since the route information which has already been used is deleted, the amount of data can be reduced, and the route information to be transmitted next is always at the beginning, so there is no need to search for information.

[Brief description of drawings]

FIG. 1 is a diagram showing a data transmission network according to an embodiment of the present invention.

FIG. 2 is a diagram showing a data transmission destination table according to an embodiment of the present invention.

FIG. 3 is a diagram showing a data transmission network according to another embodiment of the present invention.

FIG. 4 is a diagram showing channel connection information according to another embodiment of the present invention.

FIG. 5 is a diagram showing a data transmission network according to another embodiment of the present invention.

FIG. 6 is a diagram showing fixed route information according to another embodiment of the present invention.

FIG. 7 is a diagram showing fixed route information according to another embodiment of the present invention.

FIG. 8 is a diagram showing fixed route information according to another embodiment of the present invention.

FIG. 9 is a diagram showing a data transmission network of Conventional Example 1.

FIG. 10 is a diagram illustrating an information frame format of Conventional Example 2.

[Explanation of symbols]

ls, la, lb, lc, ld, lr originating station S, relay stations A to D destination stations R 11 to 13 fixed route 14 data header section lsa, lsb, lab, lac, lad relay line S
A, SB, AB, AC, AD lbc, lbd, lcd, lcr, ldr Relay line B
C, BD, CD, CR, DR 2s, 2a, 2b, 2c, 2d Data destination table 5a, 5b, 5c, 5d Channel connection information 71-73 Fixed route information 81-83 Fixed route information 91-93 Fixed route information

Claims (4)

[Claims] 1. A data transmission method comprising a transmitting station for transmitting data, a receiving station for receiving data, and a relay station for relaying data, wherein a plurality of fixed stations are provided between the transmitting station and the receiving station. The route is set in advance, the transmitting station sets the route information corresponding to the fixed route in the data to be transmitted, transmits the same data to each fixed route, and the relay station is set in advance according to the route information. A data transmission method characterized in that data is transmitted to a receiving station via a fixed route. 2. The relay station stores a route to be relayed corresponding to the route information.
Data transmission method described. 3. A data transmission system comprising a source station for transmitting data, a destination station for receiving data, and a relay station for relaying data, wherein the source station sequentially passes data transmission paths. A data transmission method characterized in that designated route information is set to data to be transmitted, the same data is transmitted to a plurality of routes, and the relay station transmits the data to the destination station according to the route information. 4. The data transmission method according to claim 3, wherein the relay station sequentially deletes already used route information and transmits data according to the updated route information.