JPH05344136A - Communication system for local area network - Google Patents

Abstract

PURPOSE:To eliminate transmission waiting by linking the transmission block of the own terminal behind a transmission block sent from the other terminal and separating a transmission block addressed to the own terminal from the group of transmission blocks sent from the other terminals. CONSTITUTION:Since a terminal 6 has no transmitting data, a token 11 is transmitted to a terminal 1 as the next terminal. Since the terminal 1 has transmitting data 7, transmitting data 12 are transmitted in place of the token 11 received from the terminal 6. Since a terminal 2 has transmitting data 8, the transmission block of the data 8 is linked behind a block 12. Since a terminal 3 has transmitting data 9, the transmission block is linked behind a transmission block group 13 received from the terminal 2. Since a terminal 4 inserts the transmission block having the address of the terminal itself in a transmission block group 14 sent from the terminal 3, this block is separated and extracted. Thus, the transmission waiting state of disabling the transmission although having the transmitting data is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network communication system, and more particularly to a local area network communication system for connecting and separating transmission blocks.

[0002]

2. Description of the Related Art In the conventional communication method of a local area network, as shown in FIG. 2, when a terminal does not have transmission data, another terminal shows a token (transmission right passed between terminals on the local area network). (Identifier), the function to send the token, and the function to send the sending block instead of the token when the token is received from another terminal when the terminal has the sending data. It has a function of transmitting a transmission block as it is when it receives a transmission block for a terminal, and a function of receiving the transmission block when it receives a transmission block for its own terminal from another terminal. Next, the operation will be described. In this local area network, a case will be described as an example where the terminal 1 performs communication work for transmitting data to the terminal 6 and the terminal 2 performs communication work for transmitting data to the terminal 4. At this time, the token is assumed to be held by the terminal 5.

FIG. 2A shows a state in which the terminal 5 is transmitting the token 11 to the terminal 1. Since the terminal 5 has no transmission data at this time, the next terminal, the terminal 1
To the token 11.

FIG. 2B shows a state in which the terminal 1 is transmitting the transmission block 12 including the address of the terminal 6 which is the destination of the transmission data 7 and the transmission data 7 to the terminal 2. Since the terminal 1 has the transmission data 7, it transmits the transmission block 12 instead of the token 11 received from the terminal 5.

FIG. 2C shows a state in which the terminal 2 is transmitting the transmission block 12 received from the terminal 1 to the terminal 6. Since the transmission block received from the terminal 1 is not for the terminal 2 itself, the terminal 2 transmits it to the terminal 6 as it is. The terminal 2 does not have the transmission right because the token is not sent from the terminal 1, and cannot transmit even if it has transmission data in its own terminal.

[0006]

In the above-mentioned conventional local area network communication method, even if the terminal itself has the transmission data, the transmission data cannot be transmitted unless the token is received and the transmission right is obtained. Therefore, there is a problem that the token is in a waiting state until it is sent.

[0007]

According to the communication method of a local area network of the present invention, when a local area network has transmission data in its own terminal, when a token is received from another terminal, the other party address is used instead of the token. A function of transmitting a transmission block composed of transmission data, a function of concatenating the transmission block of the own terminal after the transmission block of another terminal when the transmission block is received, and a transmission block for the own terminal A function to send a token when a transmission block consisting of only one is received, and when a transmission block group including a transmission block for the own terminal and a transmission block for another terminal is received, the transmission block group is addressed to the own terminal. Transmission blocks are separated and a transmission block group consisting only of transmission blocks destined for other terminals is transmitted. Function, and the function of transmitting the received transmission block group as it is when there is no transmission data in the own terminal and the transmission block group received does not include the transmission block for the own terminal, When it receives, it has a function of transmitting a token.

[0008]

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

FIG. 1 is a block diagram showing an embodiment of a communication system of a local area network of the present invention.

As shown in FIG. 1, the communication method of the local area network of this embodiment is such that a terminal 1 for carrying out communication work is used.
6 to 6 and a communication line 10 for transmitting transmission data. Further, the transmission data 7 indicates data transmitted by the terminal 1 to the terminal 6, the transmission data 8 indicates data transmitted by the terminal 2 to the terminal 4, and the transmission data 9 indicates data transmitted by the terminal 3 to the terminal 5. The token 11 is an identifier for passing the transmission right to another terminal. In addition, a transmission block 12 composed of a destination address of a destination terminal and transmission data,
16 and transmission block groups 13, 14 and 15 composed of a plurality of transmission blocks are transmitted and received between the terminals.

In this local area network, the terminal 1 carries out a communication work for transmitting the transmission data 7 to the terminal 6, the terminal 2 carries out a communication work for transmitting the transmission data 8 to the terminal 4, and the terminal An example will be described in which 3 performs a communication task of transmitting the transmission data 9 to the terminal 5. At this time, the token 11 is assumed to be held by the terminal 6.

FIG. 1A shows a state in which the terminal 6 is transmitting the token 11 to the terminal 1. Since the terminal 6 does not have transmission data at this time, the next terminal, the terminal 1
To the token 11.

FIG. 1B shows a state in which the terminal 1 is transmitting the transmission block 12 including the address of the terminal 6 which is the destination of the transmission data 7 and the transmission data 7 to the terminal 2. Since the terminal 1 has the transmission data 7, it transmits the transmission block 12 instead of the token 11 received from the terminal 6.

FIG. 1C shows a state in which the terminal 2 is transmitting a transmission block group 13 including a transmission block composed of the address of the terminal 4 which is the transmission destination of the transmission data 8 and the transmission data 8 to the terminal 3. Indicates. Since the terminal 2 has the transmission data 8, the terminal 2 connects the transmission block having the transmission data 8 of its own terminal after the transmission block 12 received from the terminal 1.

FIG. 1D shows a state in which the terminal 3 is transmitting a transmission block group 14 including a transmission block composed of the address of the terminal 5 which is the transmission destination of the transmission data 9 and the transmission data 9 to the terminal 4. Indicates. Since the terminal 3 has the transmission data 9, the transmission block having the data of its own terminal is connected after the transmission block group 13 received from the terminal 2.

In FIG. 1 (E), the terminal 4 transmits the transmission block group 1
4 shows a state in which the transmission block addressed to the own terminal is separated from 4 and the remaining transmission block group 15 not addressed to the own terminal is transmitted to the terminal 5. Since the transmission block group 14 sent from the terminal 3 includes the transmission block having the address of its own terminal, the terminal 4 separates and extracts this block.

In FIG. 1 (F), the terminal 5 has the transmission block group 1
5 shows a state in which the transmission block destined for the own terminal is separated from 5, and the remaining transmission blocks 16 not destined for the own terminal are transmitted to the terminal 6. Since the transmission block group 15 sent from the terminal 4 includes the transmission block having the address of the terminal 5, the terminal 5 separates and extracts this block.

In FIG. 1 (G), the terminal 6 has a transmission block 16
Shows a state in which the transmission block for the self terminal is separated and the token 11 is transmitted to the terminal 1. The terminal 6 transmits the token 11 to the terminal 1 because the transmission block 16 transmitted from the terminal 5 is only for the terminal itself and has no data to be transmitted to the terminal 1.

[0019]

As described above, according to the communication method of the local area network of the present invention, the function of connecting the transmission block of its own terminal after the transmission block transmitted from another terminal and the transmission block transmitted from another terminal. Since it has a function to separate the transmission block destined for its own terminal from the transmission block group, even if it has transmission data, there is no transmission right, so there is no waiting state for transmission that cannot be transmitted.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a communication system of a local area network of the present invention.

FIG. 2 is a configuration diagram of a conventional local area network.

[Explanation of symbols]

 1, 2, 3, 4, 5, 6 Terminal 7 Data sent from terminal 1 to terminal 6 8 Data sent from terminal 2 to terminal 4 9 Data sent from terminal 3 to terminal 5 10 Communication line 11 Token 12,16 Transmission block 13,14,15 Transmission block group

Claims (1)

[Claims] 1. In a local area network,
When own terminal has sending data, when receiving token from other terminal, function to send sending block consisting of partner address and sending data instead of token, and when receiving sending block from other terminal, from other terminal Of the transmission block of the own terminal after the transmission block of, and the function of transmitting a token when a transmission block consisting of only the transmission block of the own terminal is received, and the transmission block of the own terminal A function that, when receiving a transmission block group including a transmission block for another terminal, separates the transmission block for the self terminal from the transmission block group and transmits the transmission block group composed only of the transmission blocks for the other terminal. If there is no transmission data in the own terminal and the received transmission block group does not include the transmission block destined for the own terminal, it is received. A function of directly transmitting the signal blocks, when receiving the and token without transmitting data to the radio terminal, the communication method of a local area network, characterized in that it comprises a function of transmitting the token.