JPH0427246A - Remote bridge - Google Patents

Abstract

PURPOSE:To reduce the rotation use cost by providing a calculating and updating means of a no-communication monitoring timer value for measuring an interval time of transmitting/receiving data for flowing through a circuit, and calculating and updating the no-communication monitoring timer value by its statistical analysis processing. CONSTITUTION:A calculating and updating means for a no-communication monitoring timer value provided on a remote bridge measures an interval time of transmitting/receiving data for flowing through a circuit, calculates an optimal no-communication monitoring timer value corresponding to a variation of the communication frequency and the traffic by its statistical analysis processing, and updates the no-communication monitoring timer value of the remote bridge. In such a way, in accordance with a variation of the communication frequency and the traffic, the no-communication monitoring timer value of the remote bridge is updated automatically to an optimal value, therefore, the number of times of a delay of a data transfer can be minimized, and also, the circuit use cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is based on MAC (Media Access C).
ontrol (medium access control) bridged local area network (hereinafter referred to as LAN)
The present invention relates to a remote bridge (hereinafter referred to as a remote bridge), particularly a remote bridge that utilizes circuit switching in a public line network.

(Prior art) Conventionally, remote bridges that use line switching in public networks have been designed to automatically disconnect the line if there is no data flowing over the line for a certain period of time in order to reduce the cost of using the line. A mechanism was devised. The mechanism in this case was as follows. That is, the timer is started at a predetermined timer value, and when a timeout occurs, the line is disconnected, and if there is transmitting or receiving data on the line before the timeout occurs, the timer is started at the initial timer value. It was meant to be restarted.

(Problem to be Solved by the Invention) However, in the method described above, the setting value (timer value) of the no-communication monitoring timer is a fixed value, so the timer value when initially set is Even if the value is appropriate, due to changes in communication frequency,
The initially set timer value is no longer appropriate. Therefore, there is a problem in that unless the timer value is set to an appropriate value, it is not possible to effectively reduce communication costs.

SUMMARY OF THE INVENTION In view of these conventional problems, an object of the present invention is to provide a remote bridge that can effectively reduce line usage costs even when communication frequency and communication volume change. be.

(Means for Solving the Problems) The present invention connects a line when data notification is received, and disconnects the line when the non-communication time exceeds the non-communication monitoring timer value. In a remote bridge using an exchange, a means for calculating and updating a non-communication monitoring timer value is provided, which measures the interval time of transmitted and received data flowing through a line, and calculates and updates the non-communication monitoring timer value through statistical analysis processing. It is what it is.

(Function) The means for calculating and updating the non-communication monitoring timer value provided in the remote bridge measures the interval time between sending and receiving data flowing through the line, and uses statistical analysis processing to respond to changes in communication frequency and amount of communication. , calculate the optimal no-communication monitoring timer value, and update the no-communication monitoring timer value of the remote bridge.

In this way, the remote bridge's no-communication monitoring timer value is automatically updated to the optimal value in response to changes in communication frequency and traffic, so it is possible to minimize the number of data transfer delays and to Usage costs can be reduced.

(Example) Next, embodiments of the present invention will be described using the drawings.

FIG. 1 is a block diagram showing an embodiment of a remote bridge using circuit switching of a public line network according to the present invention.

In the figure, the remote bridge of the present invention includes a line control section 1, a relay processing section 2, a LAN control section 3, a filtering processing section 4, a timer monitoring section 5, and a statistical processing section 6. . The non-communication monitoring timer value calculation and updating means of the present invention includes a timer monitoring section 5, a statistical processing section 6, and a relay processing section 2. The line control unit 1 performs line connection/disconnection processing, notifies the relay processing unit 2 of data received from the line, and transmits data to the line in response to a transmission data request from the relay processing unit 2.

Further, the LAN control section 3 notifies the filtering processing section 4 of data on the LAN, and transmits the data onto the LAN in response to a transmission data request from the filtering processing section 4.

Further, when receiving data notification from the line control unit 1, the relay processing unit 2 requests the timer monitoring unit 5 to perform processing, and notifies the filtering processing unit 4 of the data. Furthermore, when the relay processing section 2 receives data notification from the filtering processing section 4, it requests the timer monitoring section 5 to process the data, and if the line is in a disconnected state, it sends a line connection request to the line control section 1. Then, a data transmission request is made to the line control unit 1. Also,
When the relay processing unit 2 receives a timeout notification for non-communication monitoring from the timer monitoring unit 5, it requests the line control unit 1 to disconnect the line, and the line control unit 1 performs line disconnection processing based on this line disconnection request. Let's do it.

Furthermore, the timer monitoring unit 5 measures the time (transmission/reception data interval time) from the time when processing is requested by the relay processing unit 2 until the next processing is requested, and notifies the statistical processing unit 6 of the time. At the same time, the timer monitoring section 5 also monitors the no-communication time, and notifies the relay processing section 2 of a timeout when the no-communication time exceeds the no-communication monitoring timer value.

Further, the statistical processing unit 6 is notified of the transmission/reception data interval time from the timer monitoring unit 5. The statistical processing unit 6 accumulates the number of notifications (number of times) at of the transmission/reception data interval time 1+ from the timer monitoring unit 5 for each time. Then, the statistical processing section 6
When this cumulative number reaches a predetermined memory capacity or when the system ends, it analyzes the cumulative total for each hour and determines the optimal no-communication monitoring timer value using the method described below. , and sends this to the relay processing section 2. The relay processing section 2 updates the no-communication monitoring timer value of the timer monitoring section 5 based on the no-communication monitoring timer value from the statistical processing section 6.

Further, when the filtering processing section 4 receives the data notification from the relay processing section 2, it requests the LAN control section 3 to transmit the data. Further, when the filtering processing unit 4 is notified of data from the LAN control unit 3, it determines whether the data needs to be transmitted to the line, and if necessary, notifies the relay processing unit 2 of the data, Discard the data if it is no longer needed.

Next, the analysis processing performed by the statistical processing section 6 will be explained below. There are several methods for analysis processing to determine the optimal no-communication monitoring timer value, but here we will show a method that is considered to be a typical example.

The interval time between transmitted and received data follows an exponential distribution, but since this is well known, the proof thereof will be omitted here.

Now, the probability that the next data will not be detected during time t after detecting one transmitted/received data is exp (-λ1)(
λ: constant of proportionality). However, below is exp (−λ
t) with respect to t from O to ω, which is equal to 1/λ. Here, t is the non-communication monitoring timer value. When the value of exp (-λt) described above becomes sufficiently small (for example, 0.05, 0.1, etc. depending on the desired accuracy), it can be said that the value of the non-communication monitoring timer is optimal.

As a concrete method, if the cumulative number of times during the transmission/reception data interval time tl is a, then the average transmission/reception data interval time is as follows:
−(1). This [is the statistical processing unit 6
It can be calculated by

Here, if the sufficiently small probability of not detecting data is E, then one step x logE≧t...(2
) holds true. Therefore, in the statistical processing unit 6, the above (2)
By substituting T and E found in equation (1) into the equation, the non-communication monitoring timer value t can be found.

As can be seen from the above description, in the present invention, the timer monitoring section 5 disables the remote bridge by using the optimal no-communication monitoring timer value calculated by the statistical processing section 6 upon completion of system operation as described above. The communication monitoring timer value is updated. Therefore, in the past, if the no-communication monitoring timer value was small (the timer time was short), the line would be disconnected immediately, and it would take time to connect the line to send data, resulting in frequent delays in data transfer. Also, if the no-communication monitoring timer value was large (the timer time was long), there was a problem that the line remained connected even though there was no data, increasing the cost of using the line. In the invention, the non-communication monitoring timer value of the remote bridge is automatically updated to the optimal value as described above in response to changes in communication frequency and traffic, so the number of data transfer delays can be minimized compared to the conventional method. , and the line usage cost can be reduced compared to the conventional method.

In this embodiment, the non-communication monitoring timer value calculation and updating means of the present invention is constituted by the timer monitoring section 5, the statistical processing section 6, and the relay processing section 2, but the present invention is not limited to this. For example, the non-communication monitoring timer value calculation and updating means of the present invention may be configured by the timer monitoring section 5 and the statistical processing section 6. In this case, the statistical processing section 6 directly updates the no-communication monitoring timer value of the remote bridge in the timer monitoring section 5 using the calculated no-communication monitoring timer value.

The present invention is not limited to this embodiment, and various applications and modifications can be made without departing from the gist of the present invention.

(Effects of the Invention) As described above, if the present invention is used, 1. Since the non-communication monitoring timer value of the remote bridge is automatically updated to the optimal value by the non-communication monitoring timer value calculation and updating means, the number of data transfer delays can be minimized compared to conventional methods, and line usage costs can be reduced. This has the advantage of being able to reduce the amount of damage compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the remote bridge of the present invention. ■...Line control unit, 2...Relay processing unit, 3...L
AN control unit, 4...filtering processing unit, 5...
Timer monitoring section, 6... statistical processing section. Patent Applicant: Oki Electric Industry Co., Ltd. Figure 1 is a block diagram showing an embodiment of the remote bridge of the present invention.

Claims (1)

[Scope of Claims] In a remote bridge using circuit switching of a public line network, which connects a line when data notification is received and disconnects the line when the non-communication time exceeds the non-communication monitoring timer value. , A remote bridge comprising a means for calculating and updating a non-communication monitoring timer value that measures the interval time of transmitted and received data flowing through a line, and calculates and updates the non-communication monitoring timer value through statistical analysis processing. .