JPH0482437A - Packet transmission time control method - Google Patents

Abstract

PURPOSE:To efficiently perform packet transmission replying to emergency by designating necessity for real time by arrival permission time, performing transmission as much as possible in a time zone with low traffic quantity. CONSTITUTION:A transmission/reception control part 4 which comprises a node 1 transmits a packet conforming to a transmission request from a job program, etc., when the traffic quantity receiving information from a traffic quantity measuring part 5 goes less than a prescribed threshold value, while, sends the packet when the arrival permission time arrives if the traffic quantity does not go less than the prescribed threshold value until the arrival of the arrival permission time. Therefore, the packet can be transmitted as much as possible in the time with low traffic quantity by designating the necessity/ unnecessity of the real time by the arrival permission time, and transmitting the packet when the traffic quantity arrives at the time zone where it is estimated that the traffic quantity goes less when the traffic quantity goes less, and the traffic quantity is decreased, and the packet transmission can be efficiently performed replying to the emergency.

Description

[Detailed Description of the Invention] [Summary] A packet transmission time control method that controls the time for transmitting packets to a destination via a network is used to distinguish between those that require real-time performance and those that do not, based on the allowable arrival time. The purpose is to allow packets to be specified, monitor or predict traffic volume, and transmit as much as possible during times when traffic volume is low, thereby reducing traffic volume and transmitting packets efficiently according to the level of urgency. , a traffic volume measurement unit that measures the network traffic volume, and the traffic volume (or the expected time when the traffic volume is expected to decrease) notified from the traffic volume measurement unit in response to a transmission request with an added arrival allowable time. and a transmission/reception control unit that transmits packets to the network based on the allowable arrival time, and the transmission/reception control unit responds to the transmission request when the traffic volume notified from the traffic volume measurement unit is less than a predetermined threshold. (or when the traffic volume reaches a time period when the traffic volume is expected to be low), and when the traffic volume does not decrease below a predetermined threshold by the allowed arrival time, the traffic volume is transmitted. does not reach the time period when it is expected to be low),
The packet is configured to be transmitted when the permissible arrival time has arrived.

[Industrial Application Field] The present invention relates to a packet transmission time control method for controlling the time for transmitting a packet to a destination via a network.

[Prior art and problems to be solved by the invention] Conventionally, in a local network connected to a wide area network, when the number of nodes increases and each node performs notifications, the amount of traffic increases as a result. This is disadvantageous in terms of system efficiency and manifests itself as a delay in packet arrival time.

Conventionally, when a transmission request is received, the request is sent without distinguishing between those that require real-time performance and those that do not require real-time performance, such as e-mail. For this reason, if packets are sent directly to the destination in response to a transmission request, especially during busy hours, the possibility of packet collision increases, and the packets do not reach the destination, resulting in There has been a problem in that the rate of retransmission increases after a certain period of time has elapsed, and as a result, the amount of traffic further increases, leading to a vicious cycle in which the time for packets to arrive at the destination is delayed.

The present invention specifies those that require real-time performance and those that do not by the permissible arrival time, monitors or predicts the amount of traffic, and transmits data as much as possible during times when the amount of traffic is low. The purpose of this is to reduce the number of packets and transmit packets efficiently according to the level of urgency.

[Means to solve the problem]

FIG. 1 shows a basic configuration diagram of the present invention.

In FIG. 1, node 1 is a node that connects to the network and communicates with each other.

In response to the transmission request to which the permissible arrival time has been added, the transmission/reception control unit 4 transmits a request based on the traffic volume (or the time when the traffic volume is expected to decrease) and the permissible arrival time notified from the traffic volume monitoring unit 5. It sends packets to the network and receives packets.

The traffic amount measurement unit 5 measures the amount of traffic on the network.

[Effect]

As shown in FIG. 1, in the present invention, in response to a transmission request from a business program or the like, a transmission/reception control unit 4 constituting a node 1 receives a notification from a traffic measurement unit 5 that the amount of traffic is less than a predetermined threshold. packets are sent when the amount of traffic does not fall below a predetermined threshold by the allowed arrival time (or when the amount of traffic reaches a time when the amount of traffic is expected to be less). When the amount is small (it has not arrived within the expected time period), the packet is transmitted when the permissible arrival time has arrived.

Therefore, by specifying the permissible arrival time for those that require real-time performance and those that do not, when the amount of traffic decreases, or when the time period when the amount of traffic is expected to improve is reached, the permissible arrival time By transmitting the packet when the packet arrives, it is possible to transmit the packet as much as possible during a time period when the traffic volume is low, thereby reducing the traffic volume and performing efficient packet transmission according to the degree of urgency.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be explained in detail using FIGS. 1 to 5.

In FIG. 1, node 1 is a node that connects to the network and communicates with each other, and includes driver/receiver 2.
, a LAN controller 3, a transmission/reception control section 4, a traffic amount measuring section 5, and the like. This node 1 responds to a transmission request with a permissible arrival time added from a business program (not shown), and transmits a packet to a network (LAN) toward a corresponding destination node.

The driver/receiver 2 includes a receiver that receives data (packets) taken from a network (LAN), and a driver that sends the packets to the network.

The LAN controller 3 controls the network (LAN) via the driver/receiver 2 and controls the transmission and reception of packets.

The transmission/reception control unit 4 assembles packets in response to transmission requests from the business program, and assembles packets based on the traffic volume notified from the traffic volume measurement unit 5, the time when the traffic volume is expected to decrease, and the allowable arrival time. It transmits packets to the network (described later using FIGS. 2 and 3), and receives packets.

The traffic measurement unit 5 measures the number of packets per unit time on the network (LAN).

First, the measurement of traffic amount will be explained according to the order shown in the flowchart of FIG.

In FIG. 2, ■ indicates bucket monitoring. This monitors the network (LAN) and captures transmitted packets into its own node.

@ measures the amount of traffic per unit time. This involves counting the number of packets taken in from the network in step (3) and calculating the amount of traffic per unit time.

(2) Imports own station data. This can be done by performing a CRC check on the packets imported in step ■.
Of those, the broadcast packet and the destination captures its own packet. Then, it is passed to a business program as received data.

Through the above processing, the network (LAN) is monitored and the number of packets per unit time (traffic amount) is measured.

Next, the operation at the time of transmission will be explained in detail according to the order shown in the flowchart of FIG.

In FIG. 3, ■ accepts or accepts a transmission request.

This means that the transmission/reception control section 4 accepts data to which a permissible arrival time has been assigned from a business program, etc. not shown in FIG.

■Stores data. This temporarily stores the data requested for transmission in the bath sofa.

[Phase] determines whether the arrival time is within the permissible time. This is ■
Then, it is determined whether the permissible arrival time added to the data stored in the buffer has arrived. If YES,
Send after [phase]. If No, perform [phase].

[Phase] determines whether the current amount of traffic is smaller than a threshold value or whether it is a time period when the amount of traffic is low. This determines whether the current traffic amount measured in FIG. 2 @ is less than a predetermined threshold value, or whether it is a time period in which the traffic amount measured in advance is expected to be low. If YES, transmit with [phase]. In the case of NO, the transmission time has not yet arrived, so the steps from ① onwards are repeated.

[Phase] confirms the routing information. This is done by checking the routing information that stores the notification that the node is operating, which is notified periodically (for example, every 5 minutes) via the network (LAN), and then confirming that the destination node to which you are going to send data is Check if it is working.

[Phase] determines whether the destination node is in operation.

If YES, data transmission (packet transmission) is performed in [phase], and step 2 is performed. If NO, send startup page 7) to the destination in [phase] to start the destination node,
Transmit data (send packets) in [phase] and perform ■.

0 determines whether the activation packet was not transmitted. If YES, the activation packet has not been transmitted, so the process ends (END). On the other hand, in the case of No, since the startup packet was sent in [phase], a stop packet is sent to the destination in [phase], the node is set to the stopped state, and the process ends (END).

As described above, the packet is transmitted based on the allowed arrival time added to the data of the transmission request, the current traffic volume (or the time period when the traffic volume is expected to be low), and the destination node By transmitting start packets, packets, and stop packets when the device is not in operation, it is possible to reduce the amount of traffic on the network and efficiently transmit data that is necessary/unnecessary for real-time performance.

FIG. 4 shows an example packet. This shows the Ethernet packet format. Here, the preamble (8 hides) is used as a packet serialization symbol and for detecting errors in transmission, and is added and removed by the transceiver.

Destination address (8 hide) is the Ethernet address (physical address) of the destination of the packet.

The source address (8 hide) is the Ethernet address (physical address) of the destination of the packet.

The type (2 bytes) indicates which type of protocol data the packet carries.
1500 bytes) is the actual data. Data corresponding to the start packet, packet 7), and stop packet are stored in this part and sequentially transmitted to the network.

CRC (4 bytes) is a bit for performing a CRC check, and is added and removed by the transceiver.

FIG. 5 shows a detailed illustration of the invention. Here, in case ■, the allowable arrival time for the packet is "13:00" (13:00).
This example shows a case where a transmission request with 0:00 (the same applies below) is made at 10:00. Here, during normal working hours, the amount of traffic on the network is large, and the transmission request in this case (■) is suppressed and the allowed arrival time is "13:00.
” (3rd same ■, ■, ■YES,
(Sent by processing after [phase]).

Case (2) is a case where a transmission request with the allowed arrival time "02:00" added to the packet is made at 11:00. This system is set to start night transmission from 03:00 (this is set to be the time when the traffic volume in Figure 3 [phase] is expected to be low).
Therefore, as in case ■, the allowable arrival time is 02:00.
(3rd same ■, ■, @YES, [
(transmitted by the following process).

In case ■, the permissible arrival time for the packet is “os: oo
” is made at 15:30. This system is set to start night transmission from 03:00 (the traffic volume of the 3rd phase is (The time period is expected to be low.
[Sent] by processing).

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to specify what requires real-time performance and what does not require real-time performance by the permissible arrival time, and when the amount of traffic is low, it is possible to When you reach
Since we have adopted a configuration in which packets are sent when the permissible arrival time has been reached, packets are sent as much as possible during times when traffic volume is low, reducing traffic volume and transmitting packets efficiently according to the level of urgency. It can be carried out.

In addition, by performing bucket transmission during times when traffic volume is low, for example at night, it is possible to reduce the cost required for communication in systems connected to public telephone lines or the like.

1: Node

[Brief explanation of the drawing]

2 is a flow chart for measuring traffic volume according to the present invention, 3 is a flow chart explaining the operation of the present invention, 4 is an example of a packet, and 5 is a detailed diagram of the present invention. An explanatory diagram is shown. In the figure, 1 is the node, 2 is the driver/receiver, and 3 is the LA
N controller, 4 represents a transmission/reception control section, and 5 represents a traffic amount measurement section. Ki Fuyuaki’s Steam II! 'a, the figure is also 1 figure... Nori 11ri 1j 躬 4 Figures, books, issues, June 1, 2016, 71]
-Zayat Figure 2 Yuzu

Claims (2)

[Claims] (1) In a packet transmission time control method that controls the time for transmitting a packet to a destination via a network, a traffic volume measurement unit (5) that measures the network traffic volume and a transmission request with an allowed arrival time added are used. Correspondingly, a transmission/reception control unit (4) transmits the packet to the network based on the traffic volume (or the time when the traffic volume is expected to decrease) and the permissible arrival time notified by the traffic volume measurement unit (5). The transmission/reception control unit (4) responds to a transmission request when the traffic volume notified from the traffic volume measuring unit (5) becomes less than a predetermined threshold (or when the traffic volume is expected to decrease). A packet is sent when the traffic volume reaches a predetermined threshold (when the traffic volume has not decreased below a predetermined threshold by the allowed arrival time).
(or when the time slot in which the amount of traffic is expected to be low has not arrived), the packet transmission time control method is characterized in that the packet is transmitted when the permissible arrival time has arrived. (2) When the communication destination node is in a stopped state, send a startup packet to start the communication destination node, then send a packet, and after the transmission is completed, send a stop packet to stop the communication destination node. A packet transmission time control system according to claim 1, characterized in that the packet transmission time control system is configured as follows.