JP2001016266A - Transmitter, receiver and transmission controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a capacity of a reconfiguration buffer in a receiver by making a request of locking so as not to receive packets sent from other transmitters than its own transmitter when a transmission packet is a head packet and making a request of lock release when the transmission packet is a tail end packet. SOLUTION: The transmitter 100 has a frame division means 105, a packet transmission means and a lock information notice means 101. The lock information notice means 101 transmits a lock request whose lock information type indicates a lock request to a receiver being a transmission destination of a data frame when a packet sent from the packet transmission means is a head packet of the data frame to request locking so that the receiver does not receive transmission packets from other transmitters than its own transmitter 100. When the packet sent from the packet trnasmission means is a tail end packet of the data frame, the transmitter transmits a lock request whose lock information type indicates a lock release request to the receiver being the transmission destination to request release of the locking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transmission device, a reception device, and a transmission control device in the field of digital transmission.

[0002]

2. Description of the Related Art In a conventional digital transmission device, a transmission device, a reception device, and a transmission control device include, for example, an access method described in Japanese Patent No. 2823548. FIG. 9 is a diagram showing a state in which a conventional transmitting apparatus 500, receiving apparatus 600, and transmission control apparatus 700 are connected via a network 801. The transmitting apparatus and the receiving apparatus are unique within the network. And transmission / reception is performed under the control of the transmission control device.

FIG. 6 is a block diagram for explaining a configuration of a conventional transmitting apparatus 500. Transmission device 500
Is a frame dividing unit 505 for dividing a data frame into small blocks of a size that can be transmitted on a network, a transmission buffer 102 for storing transmission packets, a transmission control unit 103 for controlling transmission of transmission packets, and a transmission unit. Transmission permission request means 104 for transmitting a transmission permission request to the transmission control device 700 when there is a transmission packet.

FIG. 7 is a diagram for explaining a configuration of a conventional receiving apparatus 600. The receiving device 600 includes a receiving buffer 301 for receiving the transmission packet transmitted by the transmitting device 500, a frame assembling unit 307 for reconstructing a data frame from the transmission packet received by the receiving buffer 301, A data amount monitoring unit 302 that monitors the data amount being received, and a reception availability notification unit 603 that transmits a reception enable notification based on the output of the data amount monitoring unit 302. FIG. 8 is a block diagram for explaining the configuration of the conventional transmission control means 700. Transmission control means 700
Is a transmission permission request queue 701 for storing transmission permission requests.
And transmission permission notifying means 704 for extracting transmission permission from the transmission permission request queue one by one and transmitting a transmission permission request and a reception request according to the transmission permission request.

Next, the operation will be described. First, when there is a data frame to be transmitted to transmitting apparatus 500, transmitting apparatus 500 issues a transmission permission request including a source address and a destination address to transmission control apparatus 700. The transmission control device 700 receives the transmission permission request from the transmission device 500, arbitrates the transmission permission requests received from the plurality of transmission devices, and sends a transmission permission notification to each transmission device one by one in order. At the same time as the transmission, the reception request is transmitted to the reception device at each transmission destination of each transmission device. Receiving device 600 receives a reception request from transmission control device 700, and if the destination address of the reception request matches its own address, only in a receivable state.
A reception enable notification is sent to transmitting apparatus 500. Upon receiving the transmission permission notification from the transmission control device 700 and the receivable notification from the receiving device 600, the transmitting device 500 transmits a transmission packet to the receiving device 600. The receiving device 600 receives the transmission packet transmitted from the transmitting device 500, and reconstructs a data frame from the received transmission packet.

Next, the operation of the transmitting apparatus 500 will be described in detail. In the frame dividing means 505 of the transmitting apparatus 500, the data frame to be transmitted is
The packet is divided into small blocks that can be transmitted on the network 801, and a transmission packet is generated. The transmission packet generated in this way is output to the transmission buffer 102.

In the transmission buffer 102, the transmission packet from the frame dividing means 505 is written for each transmission packet. When the writing of the transmission packet to the transmission buffer 102 is completed, the frame division unit 505 outputs a transmission permission request for requesting transmission to the transmission permission requesting unit 104.

[0008] In the transmission permission requesting means 104, when a transmission permission request is input from the frame dividing means 505, the transmission control device 700 transmits the request via the network 801.
, A transmission permission request in which the source address and the destination address are written is transmitted.

In the transmission control means 103, the transmission control device 7
00 and a receiving means 600
, The transmission buffer 10
2 is transmitted, and the transmission packets stored in the transmission buffer 102 are transmitted to the receiving device 600.

Next, the operation of the transmission control device 700 will be described. The transmission control device 700 receives transmission permission requests from a plurality of transmission devices and accumulates them in the transmission permission request queue 701. The transmission permission notifying unit 704 fetches the transmission permission requests one by one from the transmission permission requests from the plurality of transmission devices stored in the transmission permission request queue 701, and based on each extracted transmission permission request. Then, a transmission permission notification is transmitted to the transmission device that has transmitted the transmission permission request, and a reception request is transmitted to the reception device that is the transmission destination of the transmission device. Each of the transmission permission notification and the reception request includes information on the source address and the destination address written in the transmission permission request.

Next, the operation of the receiving apparatus will be described. In the receiving device 600, the data amount monitoring means 302
In, the amount of data stored in the reception buffer 301 is monitored, and the amount of data stored in the reception buffer 301 is output from the data amount monitoring unit 302 to the reception availability notification unit 603. When the destination address written in the reception request input from the transmission control device 700 matches the own address, the reception availability notification unit 603 checks the output of the data amount monitoring unit 302 and the reception buffer 301 Only in the case of a possible state, a receivable notification is transmitted to transmitting apparatus 500. Further, in response to the reception enable notification, the transmission packet transmitted from the transmission device 500 is received and accumulated in the reception buffer 301, and is output to the frame assembling means 307. The frame assembling means 307 reconstructs a data frame from the received transmission packet.

[0012]

However, in the conventional transmitting apparatus, receiving apparatus, and transmission control apparatus, when a plurality of transmitting apparatuses in a network try to transmit a data frame to the same receiving apparatus at the same time, Since the above-mentioned transmission control device sequentially gives a transmission permission notification to each transmitting device in units of transmission packets, the transmission packets constituting a plurality of data frames are time-multiplexed in the receiving device. There has been a problem that the required size of the reconstructing buffer for reconstructing the data frame by separating each data frame increases.
For example, assuming that the maximum number of transmitting devices that can be simultaneously transmitted in a network is N and the maximum number of data frames that can be simultaneously transmitted by one transmitting device is F, the receiving device has a maximum of N × F data frames. May be received at the same time, and assuming that the maximum size of the data frame is L, the reconstruction buffer needs to have a size of about L × N × F. An object of the present invention is to provide a transmission device, a reception device, and a transmission control device capable of reducing the size of a reconstruction buffer in a reception device.

[0013]

According to a first aspect of the present invention, there is provided a transmitting apparatus for inputting frame data and transmitting a transmission packet. Generating a transmission packet and outputting a transmission request including a destination address of a transmission destination; and requesting a transmission control device to permit transmission of the transmission packet based on the transmission request from the frame division unit. A packet transmission unit for transmitting a transmission packet from the frame dividing unit to the reception device when a transmission permission from the transmission control device and a reception enable notification from the reception device of the transmission destination of the transmission device are input. Lock information notifying means for transmitting lock information including a lock information type, a transmission source address, and a destination address. The lock information notifying means, if the transmission packet transmitted by the packet transmitting means is the first packet of the data frame, the lock information type is a lock request to the receiving apparatus which is the transmission destination of the data frame. It transmits certain lock information and requests a lock so as not to receive a transmission packet from a transmission device other than its own transmission device. If the data packet is the last packet of the data frame, the lock information type is transmitted to the reception device. Transmits lock information as a lock release request, and requests to release the lock.

[0014] According to a second aspect of the present invention, there is provided a transmitting apparatus.
In the transmission device described in the above, the lock information notification means,
One or both of the lock request and the lock release request are multiplexed on the transmission packet.

According to a third aspect of the present invention, in the receiving apparatus for receiving a transmission packet, the receiving apparatus receives the lock information transmitted from the transmitting apparatus, and detects the lock information type and the source address based on the received lock information. Lock information detecting means for performing, a source lock address register storing the source address detected by the lock information detecting means as a source lock address, and receiving a reception request of a transmission packet transmitted from a transmission control device, Source address comparison means for comparing the source address written in the reception request with the source lock address stored in the source lock address register, and outputting a match or mismatch comparison result; Only when the comparison result from the source address comparing means indicates a match, a receivable message is sent to notify the receivability. Means, wherein the source lock address register is provided when the type of the lock information detected by the lock information detecting means is a lock request, and nothing is stored in the source lock address register. Storing the transmission source address of the received lock information as a transmission source lock address, the type of the received lock information being a lock release request, and being stored in the transmission source address and the transmission source lock address register. If the sender lock addresses match, the storage of the sender lock address is deleted.

[0016] Further, the transmitting device according to the fourth aspect is the first aspect.
In the transmission device described above, the frame division unit requests transmission of the transmission packet and outputs a destination address of the transmission packet, and receives and receives the lock information transmitted from another transmission device. From the lock information, a lock information detecting means for detecting a lock information type and a destination address, and, among the lock information detected by the lock information detecting means, when the lock information type is a lock request, The destination address is stored as a destination lock address, and when the lock information type of the lock information is a lock release request, a destination lock address memory for deleting the storage of the destination lock address, and When a transmission request is input, the destination address written in the transmission request and the destination lock A destination address comparing unit that compares all the destination lock addresses stored in the address memory; and a transmission request input from the frame dividing unit based on a comparison result from the destination address comparing unit. The destination address is the destination lock address stored in the destination lock address memory.
And transmission permission request means for transmitting a transmission permission request only when none of them match.

According to a fifth aspect of the present invention, there is provided a transmission control apparatus for sequentially granting a transmission permission to each transmission apparatus connected to a network one by one, and controlling transmission of a transmission packet from each transmission apparatus. A lock information detecting means for receiving lock information transmitted from each of the transmitting apparatuses, detecting a lock information type, a source address, and a destination address from the received lock information; and detecting the lock information detecting means. When the lock information type is a lock request, the source address and the destination address are stored as a set of lock addresses in association with each other, and when the lock information type is a lock release request, A lock address memory for deleting the lock address from storage, and a source address and a destination transmitted from each of the transmitting devices. A transmission permission request queue for receiving and holding a transmission permission request having a transmission permission request, and a transmission permission received first by the transmission permission request queue among the transmission permission requests stored in the transmission permission request queue. An address comparing means for comparing the destination address and the source address of the request with all the lock addresses recorded in the lock address memory; and the lock address based on a comparison result from the address comparing means. The transmission permission notification is sent to the transmitting device only when the destination address of the transmission permission request is equal to the destination address of the transmission permission request, and the lock address does not have the lock address different from the transmission source address of the transmission permission request. And the above-mentioned transmission permission notifying means for transmitting.

The transmitting device according to claim 6 is the same as the transmitting device according to claim 4.
The transmission device according to the above, further comprising a lock timer that records a time when the destination address is stored in the destination lock address memory for each of the destination addresses, wherein the destination lock address memory has a predetermined time after the time. If the time has passed, delete the storage of the destination address,
It is characterized by the following.

Further, the receiving apparatus according to claim 7 is the receiving apparatus according to claim 3.
The receiving device according to claim 1, further comprising a lock timer that records a time when the transmission source address is stored in the transmission source lock address register, wherein the transmission source lock address register has a predetermined time elapsed after the time. In this case, the storage of the transmission source address is deleted.

The transmission control device according to claim 8 is the transmission control device according to claim 5, further comprising a lock timer for recording a time when the lock address is stored in the lock address memory for each lock address. The lock address memory deletes the storage of the lock address when a predetermined time has elapsed after the time.

[0021]

(Embodiment 1) FIG. 1 shows a state in which a transmitting apparatus 100, a receiving apparatus 300, and a transmission control apparatus 700 according to Embodiment 1 are connected via a network 801. FIG. 3 is a connection diagram showing the transmission device 1;
00 and the receiving device 300 are respectively connected to the network 8
01 has a unique address, and the transmission control device 70
The transmission packets are mutually transmitted and received under the control of 0. FIG. 2 shows the first embodiment.
FIG. 2 is a block diagram for explaining a configuration of the transmitting apparatus 100 in FIG.

The transmitting apparatus 100 includes a frame dividing unit 105 for dividing a data frame into transmission packets that can be transmitted on a network, a packet transmitting unit for transmitting the transmission packet, a lock information type, a transmission source address,
And a lock information notifying unit 101 for transmitting lock information including a destination address, wherein the lock information notifying unit 101 is configured to transmit the lock information if the transmission packet transmitted by the packet transmitting unit is a head packet of the data frame. A lock request whose lock information type is a lock request to a receiving device that is a transmission destination of the data frame, and requests a lock so as not to receive a transmission packet from a transmitting device other than its own transmitting device. If the data packet is the last packet of the data frame, the lock information type is transmitted to the receiving apparatus as lock information of a lock release request, and a request is made to release the lock.

The packet transmitting means includes a transmission buffer 102 for temporarily storing and transmitting the transmission packet.
Transmission permission request means 104 for transmitting a transmission permission request
And transmission control means 103 for controlling the transmission of the transmission packets stored in the transmission buffer 102. When the frame division means 105 has a packet to be transmitted, the transmission permission request When output from the request means 104 to the transmission control device and the transmission permission notification from the transmission control device and the reception permission notification from the receiving device are input,
Under the control of the transmission control means 103, the transmission packets stored in the transmission buffer 102 are transmitted. FIG. 3 is a block diagram for explaining a configuration of receiving apparatus 300 according to the first embodiment.

The receiving apparatus 300 includes a receiving buffer 301 for receiving a transmission packet, and a data amount monitoring means 30 for monitoring the amount of data stored in the receiving buffer 301.
2, a lock information detecting means 305 for receiving lock information from the transmitting apparatus and extracting a source lock address, a source lock address register 306 for storing the lock address extracted by the lock information detecting means 305, a lock address A lock timer 308 that measures the time stored in the lock address register 306, a source address comparison unit 304 that determines whether or not the source address and the lock address match, and a reception request from the transmission control device. When the written destination address matches its own address, a reception enable / disable notification unit 303 for transmitting a reception enable notification based on the outputs of the data amount monitoring unit 302 and the transmission source address comparison unit 304, and a reception buffer 301 Frame that reconstructs a data frame from transmission packets received by It has a standing unit 307, a.

In the initial state, it is assumed that nothing is stored in the transmission source lock address register 306. If nothing is stored in the source lock address register 306, the source address comparison means 3
In step 04, “receivable” is always output irrespective of the value of the transmission source address written in the transmission permission. It will be. Also, the same transmission control device as the conventional transmission control device 700 in FIG. 8 is used.

Next, the operation will be described. First, referring to FIG. 1, when there is a data frame to be transmitted to transmitting apparatus 100, transmitting apparatus 100 outputs a transmission permission request including a source address and a destination address to transmission control apparatus 700. In the transmission control device 700, arbitration of transmission permission requests received from a plurality of transmission devices is performed, a transmission permission notification is transmitted to each transmission device one by one in order, and reception of each transmission destination of the transmission device A reception request is transmitted to each device. Upon receiving the reception request from the transmission control device 700, if the destination address of the reception request matches its own address, the reception device 300 sends a reception enable notification to the transmission device 100 only in a receivable state. Notified.

In the transmission device 100, the transmission control device 7
00 and the receiving device 3
00, the network 80
1, a lock request is broadcast, and after the lock request is broadcast, a transmission packet is transmitted to the receiving device 300. After transmitting the transmission packet, the transmitting device 100 broadcasts an unlock request on the network 801.

In the receiving device 300, the transmitting device 1
00, the transmission device 100
Transmission and reception with other transmission devices are locked, and the transmission device 1 is locked.
Only the transmission packets from 00 are received. At this time, the reception of the transmission packet from the transmission device 100 ends,
Upon receiving the unlock request from the transmitting device 100,
Release the lock.

Next, the operation of the transmitting apparatus 100 will be described in detail. First, in the transmitting apparatus 100, the frame dividing unit 105 divides a data frame to be transmitted into small blocks of a size that can be transmitted on the network 801, and generates a transmission packet. The generated transmission packet is output to the transmission buffer 102, where the input transmission packet is written. Also, the frame dividing means 105
Then, when the transmission packet is written in the transmission buffer 102, a transmission request is output to the transmission permission requesting unit 104 by designating a destination address. In the transmission permission request unit 104, when the transmission request is input from the frame division unit 105, a transmission permission request including the information of the source address and the destination address is transmitted to the transmission control device 700 via the network. You.

When the transmission control means 103 receives the transmission permission request from the transmission control device 700 and the reception enable notification from the reception device 300, it outputs a control signal to the transmission buffer 102. In the transmission buffer 102, the receiving device 300 is controlled based on the control signal from the transmission control means.
, The transmission packet stored in the transmission buffer 102 is transmitted.

When the transmitting apparatus 100 transmits a transmission packet, if the transmission packet is the first packet constituting the data frame, the lock information notifying means 10
1, the lock information whose lock information type is “lock request” is broadcast on the network 801. Also,
If the transmission packet is the last packet of the data frame, the lock information notifying unit 101 broadcasts the lock information whose lock information type is “unlock request” on the network 801. In both the lock request and the lock release request, the transmission source lock address is the address of its own transmission device 100, and the destination address specifies the address of the destination reception device 300.

At this time, the “lock request” and “lock release request” can be transmitted by being embedded in a transmission packet. That is, the lock information can be transmitted by embedding a “lock request” in a transmission packet including the head data of the data frame and an “unlock request” in a transmission packet including the end data of the data frame. By doing so, it is not necessary to transmit another new transmission packet for transmitting the lock information, and the lock information can be transmitted efficiently.

Next, the operation of the receiving apparatus 300 will be described in detail. In the receiving apparatus 300, the data amount monitoring means 302 monitors the amount of data stored in the receiving buffer 301, and
If there is enough space to receive the transmission packet, a notification of “reception possible” is given, or if there is no room to receive the transmission packet, a notification of “reception not possible” is given,
3 is output.

When the destination address written in the reception request received from the transmission control device 700 coincides with its own address, the reception possibility notification means 303 outputs the output of the data amount monitoring means 302 and the source address comparison means 304
, The transmission of the receivable notification is determined. As described above, in the initial state, the source lock address register 306
Has nothing stored therein, the reception availability notification means 30
In 3, it is determined whether or not the data can be received only from the output of the data amount monitoring means 302. Only when the output of the data amount monitoring means 302 is “receivable”, the reception enable notification is transmitted.
Sent to 0.

In the receiving apparatus 300, when the transmission packet transmitted from the transmitting apparatus 100 is received in response to the reception enable notification, the received transmission packet is temporarily stored in the reception buffer 301, and the frame is assembled. Passed to the means 307. The frame assembling means 307 reconstructs a data frame from the received transmission packet.

When receiving apparatus 300 receives lock information from transmitting apparatus 100, it operates as follows. Upon receiving the lock information, the lock information detecting unit 305 extracts the lock information type and the source address from the received lock information. At this time, if the lock information type is "lock request", the source lock address is output from the lock information detecting means 305 to the source lock address register 306. The transmitted source address is stored as the source lock address.

If the lock information type is "lock release request", the source lock address register 3
If the transmission source lock address stored in 06 is equal to the received transmission source address, the transmission source lock address stored in the transmission source lock address register 306 is cleared. In the lock timer 308, the time at which the source lock address was written is recorded in the source lock address register 306. If the elapsed time from this time exceeds a predetermined timeout value, the source lock address register The source lock address stored in 306 is cleared. If the receiving device 300 receives a reception request while some of the transmission source lock addresses are stored in the transmission source lock address register 306, the following operation is performed.

In the source address comparison means 304, the source lock address stored in the source lock address register 306 includes the source lock address whose contents match the source address written in the reception request. "Reception possible notification" is given only when the
Output to In the reception possibility notification means 303, when the destination address written in the reception request is equal to its own address, and when the outputs of both the data amount monitoring means 302 and the source address comparison means 304 are "receivable" Only the receivable notification is sent.

As described above, according to the transmission device, the reception device, and the transmission control device in the first embodiment, when the reception device receives a data frame from a certain transmission device, the reception of one data frame is completed. Until the reception of a transmission packet from another transmission device can be rejected. Therefore, since at most one transmitting device can simultaneously transmit to one receiving device, the maximum size of a data frame is L, and the maximum number of data frames that one transmitting node can transmit at the same time is F. The required size of the data frame reconstruction buffer in the receiving apparatus is about L × F, which can be reduced to about 1 / N of the required size of the conventional data frame reconstruction buffer.

(Embodiment 2) FIG. 4 shows Embodiment 2 of the present invention.
FIG. 2 is a block diagram for explaining a configuration of a transmitting apparatus 200 in FIG. Transmitting apparatus 200 according to Embodiment 2
Is compared with the transmitting apparatus 100 in the first embodiment.
Lock information detecting means 206 for receiving lock information transmitted from another transmitting device and detecting a lock information type and a destination address from the received lock information; and among the lock information detected by the lock information detecting means, If the lock information type is a lock request, the destination address is stored as a destination lock address, and if the lock information type of the lock information is a lock release request, the destination lock address is stored. The destination lock address memory 208 to be deleted and the frame dividing means 105
When a transmission request is input, the destination address comparison means 207 compares the destination address written in the transmission request with all the destination lock addresses stored in the destination lock address memory. A lock timer 209 for storing the time when the destination address is stored as the destination lock address in the address memory 208 after and after the destination lock address is newly provided. Further, transmitting apparatus 200 according to Embodiment 2 replaces transmission permission requesting section 104 of transmitting apparatus 100 according to Embodiment 1 with frame dividing section 105 based on a comparison result from destination address comparing section 207. A transmission permission request unit 204 is provided for transmitting a transmission permission request only when the destination address described in the input transmission request does not match any of the destination lock addresses stored in the destination lock address memory 208.

That is, transmitting apparatus 200 according to Embodiment 2 acquires lock information transmitted by another transmitting apparatus, and transmits the lock information to the receiving apparatus locked by the other transmitting apparatus during the lock. The transmission permission request is not transmitted. Other configurations of transmitting apparatus 200 according to the second embodiment are similar to transmitting apparatus 10 according to the first embodiment.
0 and the transmission device 20 according to the second embodiment.
0 can be used in place of transmitting apparatus 100 in Embodiment 1 on network 801 in FIG.

Next, the operation will be described. Transmitting apparatus 200 according to the second embodiment receives lock information transmitted from another transmitting apparatus, and issues a transmission permission request to a receiving apparatus locked by the other transmitting apparatus during the lock. It operates so as not to transmit, and other operations are the same as those of transmitting apparatus 100 in the first embodiment.

This will be specifically described. Transmission device 200
In the lock information detecting means 206 of the above, upon receiving the lock information of the “lock request” transmitted from the other transmitting device, the destination address is extracted from the received lock information of the “lock request”, and the extracted destination address is ,
Output to the destination lock address memory 208. The destination lock address memory 208 has a list of destination lock addresses, and when a destination address is input from the lock information detecting means 206, the input destination address is added to the destination lock address list as a destination lock address. Is done.

Next, in the lock information detecting means 206,
When receiving the lock information of the “unlock request” from another transmitting device, the destination address is extracted from the lock information of the received “unlock request”, and the extracted destination address is stored in the destination lock address memory 208.
Output to At this time, in the destination lock address memory 208, the destination lock address corresponding to the destination address of the lock release request is deleted from the list of the destination lock addresses.

In the lock timer 209, the time at which the destination lock address is stored in the list of the destination lock address memory 208 is recorded for each destination lock address. If the predetermined timeout value is exceeded, the destination lock address is deleted from the list in the destination lock address memory 208.

When the frame division means 105 requests transmission of a transmission packet, the transmission permission request means 20
In 4, when a transmission request is input from the frame dividing means 105, a transmission permission request including a source address and a destination address is output to the transmission control device 700 based on the output of the destination address comparing means 207. You. Specifically, in the destination address comparing means 207, the destination address specified by the frame dividing means 105 is compared with a list in the destination lock address memory 208, and if the destination address is included in the list, An instruction is issued to the transmission permission request means 204 to prohibit transmission of the transmission permission request. Further, when the destination address is not included in the list, the transmission permission requesting unit 2 is transmitted in the same manner as the transmitting apparatus 100 in the first embodiment.
04, a transmission permission request is transmitted, and the transmission control device 1
When a transmission permission and reception enable notification is input to the transmission buffer 03, a transmission packet is transmitted from the transmission buffer 102.

As described above, transmitting apparatus 200 in the second embodiment acquires lock information transmitted by another transmitting apparatus, and locks the receiving apparatus locked by the other transmitting apparatus. Is configured not to transmit the transmission permission request, so that the transmission permission request to the receiving node locked by another transmission node can be suppressed in advance, so that unnecessary transmission permission request transmission is eliminated. In addition, unnecessary transmission permission assigned by the transmission control device 700 can be eliminated, and unnecessary traffic on the network can be eliminated.

(Embodiment 3) FIG. 5 shows Embodiment 3 of the present invention.
FIG. 2 is a block diagram for explaining a configuration of a transmission control device 400 in FIG. The transmission control device 400 according to the third embodiment can be used in place of the transmission control device 700 according to the first embodiment on the network 801 shown in FIG.
It can be used in combination with 0.

Transmission control device 40 in the third embodiment
0 is a lock information detecting unit 406 that receives lock information from each transmission device and detects a lock information type, a source address, and a destination address from the received lock information as compared with the conventional transmission control device 700. When the lock information type among the lock information detected by the lock information detecting means 406 is a lock request, the source address and the destination address are stored as a set of lock addresses in association with each other. When the information type is a lock release request, a lock address memory 405 for deleting the lock address from storage, and a lock timer for recording the time when the lock address was stored in the lock address memory 405 for each lock address. 407,
Among the transmission permission requests held in the transmission permission request queue 401 described later, the transmission permission request queue 401
, The destination address and the source address of the transmission permission request received first, and the lock address memory 4
And an address comparison unit 402 for comparing all the lock addresses recorded in the storage unit 05 with the above-mentioned lock addresses. Further, the transmission control device 400 according to the third embodiment
Is based on the comparison result from the address comparing means 402 in place of the transmission permission notifying means 704 in the conventional transmission control device 700, and the destination address of the lock address is equal to the destination address of the transmission permission request, and Only when there is no lock address whose transmission address of the lock address is different from the transmission source address of the transmission permission request, there is provided the transmission permission notifying means 404 for transmitting a transmission permission notification to the transmitting device. Also,
The transmission control device 400 is a conventional transmission control device 700.
In place of the transmission permission request queue 701, the transmission permission request having the transmission source address and the destination address transmitted from each transmission device is received and held, and the transmission permission requests are held one by one from the held transmission permission requests. It is provided with a transmission permission request queue 401 that outputs the source address and the destination address to the transmission permission notifying means 404 and outputs the address to the address comparing means 402 according to the extracted transmission permission request.

Next, the operation will be described. When the transmission permission request is received from the transmitting device, the transmission permission request queue 401 holds the received transmission permission request. Further, the lock information detecting means 406 receives the lock information, and when the lock information type is detected as “lock request”, the transmission source address and the destination address are extracted from the lock information of the detected “lock request”. The extracted source address and destination address are recorded in the lock address memory 405 as a set of lock addresses.

In the lock timer 407, the time when the lock address is stored in the lock address memory 405 is recorded for each lock address. If the elapsed time from the time exceeds a predetermined timeout value, The lock address is deleted from the lock address memory 405.

The address comparison means 402 sends the transmission permission request held at the head of the transmission permission request queue 401 to the
That is, among the transmission permission requests held in the transmission permission request queue 401, the destination address and the source address of the transmission permission request received first by the transmission permission request queue 401 are stored in the lock address memory 405. The comparison with all the lock addresses is performed, and the comparison result is output to the transmission permission notifying unit 404. The transmission permission notifying unit 404 transmits a transmission permission notification and a reception request based on the comparison result from the address comparing unit 402. Specifically, only when there is no lock address where the destination address of the lock address is equal to the destination address of the transmission permission request and the source address of the lock address is different from the source address of the transmission permission request The transmission permission notification unit 404 transmits a transmission permission notification and a reception request.

In other words, when there is a locked receiving device, it acts so that the transmitting device is not given permission for transmission to the receiving device other than the transmitting device registered as the partner. As described above, according to the transmission control device 400 in the third embodiment, the locked receiving device allows the transmitting device other than the transmitting device registered as the receiving partner to transmit to the receiving device. Is not given, unnecessary transmission permission is not given, and the network can be used more efficiently.

[0054]

As described above, according to the transmitting apparatus of the first aspect, in a transmitting apparatus that inputs frame data and transmits a transmission packet, the frame data is divided to generate one or more transmission packets. A frame division unit for outputting a transmission request including a destination address of a transmission destination; and a transmission control unit requesting a transmission control unit to permit transmission of the transmission packet based on the transmission request from the frame division unit. When a transmission permission from the receiving apparatus and a reception enable notification from the receiving apparatus at the transmission destination of the transmitting apparatus are input, packet transmitting means for transmitting the transmission packet from the frame dividing means to the receiving apparatus, lock information type, Lock information notifying means for transmitting lock information including a transmission source address and a destination address. The stage transmits the lock information whose lock information type is a lock request to the receiving device that is the transmission destination of the data frame, if the transmission packet transmitted by the packet transmission unit is the first packet of the data frame. Then, it requests a lock so as not to receive a transmission packet from a transmission device other than its own transmission device, and if it is the last packet of the data frame, the lock information type is transmitted to the reception device by a lock release request. Transmitting certain lock information and requesting that the lock be released, so that the transmission from one transmission apparatus to another reception apparatus is completed until transmission of one data frame is completed. This has an effect that reception of a data frame can be rejected.

[0055] According to the transmission apparatus of the second aspect, in the transmission apparatus of the first aspect, the lock information notifying means transmits one or both of the lock request and the lock release request to the transmission packet. Since multiplexing is performed, it is not necessary to transmit a new transmission packet for transmitting a lock request and an unlock request, and the lock information can be transmitted efficiently. .

According to a third aspect of the present invention, in a receiving apparatus for receiving a transmission packet, the receiving apparatus receives the lock information transmitted from the transmitting apparatus, and determines the lock information type and the source address based on the received lock information. Lock information detecting means for performing detection, a source lock address register for storing the source address detected by the lock information detecting means as a source lock address, and receiving a request for receiving a transmission packet transmitted from a transmission control device. Source address comparing means for comparing the source address written in the reception request with the source lock address stored in the source lock address register and outputting a result of comparison of match or mismatch And a reception notifying that a reception is possible only when the comparison result from the transmission source address comparison means matches. The source lock address register, wherein the type of the lock information detected by the lock information detection means is a lock request, and nothing is stored in the source lock address register. In the case, the transmission source address of the received lock information is stored as a transmission source lock address, and the type of the received lock information is a lock release request,
When the transmission source address matches the transmission source lock address stored in the transmission source lock address register, the storage of the transmission source lock address is deleted. Until the reception of one data frame from the device is completed, the reception of a data frame from another transmitting device can be rejected, and the buffer size for reconstructing the data frame can be reduced.

According to a fourth aspect of the present invention, in the transmission apparatus of the first aspect, the frame dividing means requests transmission of the transmission packet and outputs a destination address of the transmission packet. A lock information detecting means for receiving lock information transmitted from another transmitting apparatus and detecting a lock information type and a destination address based on the received lock information; and the lock detected by the lock information detecting means. In the information, when the lock information type is a lock request, the destination address is stored as a destination lock address, and when the lock information type of the lock information is a lock release request,
When the transmission request is input from the frame dividing means, the destination lock address memory for deleting the storage of the destination lock address, the destination address written in the transmission request, and the destination lock address memory are stored in the destination lock address memory. Destination address comparing means for comparing all the destination lock addresses with the destination address described in the transmission request input from the frame dividing means based on the comparison result from the destination address comparing means. Transmission permission request means for transmitting a transmission permission request only when none of the destination lock addresses stored in the lock address memory coincide with each other. Unnecessary because transmission permission requests to receiving nodes It is possible to eliminate the transmission of the transmission permission request, an effect that can be further eliminated even unnecessary transmission permission assigned by the transmission control device.

According to the transmission control device of the present invention, transmission permission is sequentially given to each transmission device connected in the network one by one, and transmission of a transmission packet from each transmission device is controlled. In the transmission control device, lock information detection means for receiving lock information transmitted from each of the transmission devices and detecting a lock information type, a source address, and a destination address from the received lock information, and the lock information detection means When the lock information type is a lock request among the lock information detected by the above, the source address and the destination address are stored as a set of lock addresses in association with each other, and the lock information type is a lock release request. At the time, a lock address memory for deleting the lock address from the memory, and a source address transmitted from each of the transmission devices. A transmission permission request queue for receiving and holding a transmission permission request having a destination address, and a transmission first received by the transmission permission request queue among the transmission permission requests stored in the transmission permission request queue. Address comparison means for comparing the destination address and the transmission source address of the permission request with all the lock addresses recorded in the lock address memory; and the lock based on a comparison result from the address comparison means. The transmission device transmits a transmission permission notification only when the destination address of the address is equal to the destination address of the transmission permission request and the lock address whose transmission source address is different from the transmission source address of the transmission permission request does not exist. And the above-mentioned transmission permission notifying means for transmitting to the It is not necessary given the unnecessary transmission permission to the communication apparatus, has the effect of being able to use the network more efficiently.

According to a sixth aspect of the present invention, in the transmission apparatus according to the fourth aspect, a lock timer for recording the time when the destination address is stored in the destination lock address memory for each of the destination addresses is provided. The destination lock address memory, when a predetermined time has elapsed after the time, deletes the storage of the destination address. Even if the lock release request is not transmitted for a long time, the lock can be forcibly released and the data frame can be transmitted to the receiving device.

According to a seventh aspect of the present invention, in the receiving apparatus of the third aspect, there is provided a lock timer for recording a time when the source address is stored in the source lock address register. The transmission source lock address register is characterized in that when a predetermined time has elapsed after the time, the storage of the transmission source address is deleted. Even when the lock release request is not transmitted for a long time, the lock is forcibly released and the data frame can be received from another transmitting apparatus.

According to the transmission control device of the present invention, in the transmission control device of the present invention, a lock timer for recording the time when the lock address is stored in the lock address memory for each lock address. The lock address memory is characterized in that when a predetermined time has elapsed after the time, the storage of the lock address is deleted. If you do n’t send an unlock request for a long time,
This has the effect that a data frame can be transmitted from another transmitting device to the receiving device.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a connection among a transmission device 100, a reception device 300, and a transmission control device 700 according to Embodiment 1.

FIG. 2 is a block diagram illustrating a configuration of a transmitting apparatus 100 according to Embodiment 1.

FIG. 3 is a block diagram for describing a configuration of a receiving apparatus 300 according to the first embodiment.

FIG. 4 is a block diagram for describing a configuration of a transmitting apparatus 200 according to Embodiment 2.

FIG. 5 is a block diagram illustrating a configuration of a transmission control device 400 according to a third embodiment.

FIG. 6 is a block diagram for explaining a configuration of a conventional transmission device 500.

FIG. 7 is a block diagram for explaining a configuration of a conventional receiving apparatus 600.

FIG. 8 is a block diagram illustrating a configuration of a conventional transmission control device 700.

FIG. 9 is a diagram illustrating an example of a connection between a conventional transmission device 500, a reception device 600, and a transmission control device 700.

[Explanation of symbols]

 101 Lock information notification means 102 Transmission buffer 103 Transmission control means 104 Transmission permission request means 105 Frame division means 204 Transmission permission request means 206 Lock information detection means 207 Destination address comparison means 208 Destination lock address memory 301 Reception buffer 302 Data amount monitoring means 303 Reception propriety notifying means 304 Source address comparing means 305 Lock information detecting means 306 Source lock address register 307 Frame assembling means 401 Transmission permission request queue 402 Address comparing means 404 Transmission permission notifying means 405 Lock address memory 406 Lock information detecting means 505 Frame Division means 603 Reception permission / non-permission notification means 702 Transmission permission notification means 801 Transmission device 802 Receiving device 803 Transmission control device 804 Network

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K030 GA03 GA06 HA08 HB29 JA07 KA03 KX12 LC09 LE06 MA09 MA13 5K031 AA01 AA06 CB10 DA11 DA15 DB11 EC05 5K034 AA09 AA11 FF02 GG03 HH01 HH02 HH13 HH63 NN11 NN11 NN11 CC03 DD10 GG01 JJ18 KK56

Claims (8)

[Claims] 1. A transmission device for inputting frame data and transmitting a transmission packet, wherein the transmission device generates one or more transmission packets by dividing the frame data and outputs a transmission request including a destination address of a transmission destination. Frame dividing means, for requesting a transmission control apparatus to permit transmission of the transmission packet based on a transmission request from the frame division means, permitting transmission from the transmission control apparatus, and receiving a transmission destination of the transmission apparatus. When a reception enable notification is input from the device, packet transmitting means for transmitting the transmission packet from the frame dividing means to the receiving device, lock information having a lock information type, a source address, and a destination address are transmitted. Lock information notification means to be transmitted;
The lock information notifying means, if the transmission packet transmitted by the packet transmitting means is a head packet of the data frame, the lock information type is locked to a receiving apparatus to which the data frame is transmitted. The lock information is transmitted as a request, and a lock is requested so as not to receive a transmission packet from a transmission device other than its own transmission device. If the data packet is the end packet of the data frame, the lock is transmitted to the reception device. A transmission device, wherein lock information whose information type is a lock release request is transmitted, and a request is made to release the lock. 2. The transmitting apparatus according to claim 1, wherein the lock information notifying unit multiplexes one or both of the lock request and the lock release request into the transmission packet. . 3. A receiving device for receiving a transmission packet, wherein the receiving device receives the lock information transmitted from the transmitting device, and detects a lock information type and a transmission source address from the received lock information. A source lock address register for storing the source address detected by the lock information detecting means as a source lock address; and a reception request for a transmission packet transmitted from a transmission control device, the request being written in the reception request. A source address comparing unit that compares a source address with the source lock address stored in the source lock address register and outputs a comparison result of match or mismatch; and Receiving means for notifying that reception is possible only when the comparison result indicates a match, If the lock information detected by the lock information detecting means is the lock request and the source lock address register does not store anything, the lock address register indicates the source of the received lock information. An address is stored as a source lock address, the type of the received lock information is a lock release request, and the source address matches the source lock address stored in the source lock address register. In this case, the storage of the source lock address is deleted. 4. The transmission device according to claim 1, wherein the frame division unit requests transmission of the transmission packet and outputs a destination address of the transmission packet, and the frame division unit transmits the transmission address from another transmission device. Lock information is received, from the received lock information, lock information detection means for detecting the lock information type and destination address, Among the lock information detected by the lock information detection means, the lock information type, If the request is a lock request, the destination address is stored as a destination lock address. If the lock information type of the lock information is a lock release request, the destination lock address memory for deleting the storage of the destination lock address is deleted. When the transmission request is input from the frame dividing means, the destination written in the transmission request A dress, a destination address comparison means for comparing all of the destination lock address stored in the destination lock address memory, based on the comparison result from the destination address comparing means,
Transmission permission requesting means for transmitting a transmission permission request only when the destination address described in the transmission request input from the frame division means does not match any of the destination lock addresses stored in the destination lock address memory; A transmitting device comprising: 5. A transmission control apparatus for sequentially granting transmission permission to each of transmission apparatuses connected in a network one by one, and controlling transmission of a transmission packet from each of the transmission apparatuses. Received lock information, lock information detecting means for detecting the lock information type, the source address and the destination address from the received lock information, of the lock information detected by the lock information detecting means,
When the lock information type is a lock request, the source address and the destination address are associated and stored as a set of lock addresses. When the lock information type is a lock release request, the lock address is stored. A lock address memory for deleting from the transmission device, a transmission permission request queue for receiving and holding a transmission permission request having a source address and a destination address transmitted from each of the transmission devices, In the transmission permission request, the destination address and the transmission source address of the transmission permission request received first by the transmission permission request queue, and all the lock addresses recorded in the lock address memory. An address comparing means for comparing, and the lock address based on a comparison result from the address comparing means. Only when the destination address is equal to the destination address of the transmission permission request and the source address of the lock address is not the lock address different from the source address of the transmission permission request, the transmission permission notification is transmitted to the transmission device. And a transmission permission notifying unit. 6. The transmission device according to claim 4, further comprising: a lock timer that records a time when the destination address is stored in the destination lock address memory for each of the destination addresses. When a predetermined time has elapsed after the time, the storage of the destination address is deleted. 7. The receiving device according to claim 3, further comprising: a lock timer for recording a time when the transmission source address is stored in the transmission source lock address register; When a predetermined time has elapsed, the storage of the transmission source address is deleted. 8. The transmission control device according to claim 5, further comprising: a lock timer that records a time when the lock address is stored in the lock address memory for each lock address, wherein the lock address memory stores the lock address after the time. When a predetermined time has elapsed, the storage of the lock address is deleted.