JPH03108923A - Route selection system - Google Patents

Abstract

PURPOSE:To reduce the route setting time and to improve the selection efficiency by calculating a transmission margin of each route and compares them when plural routes exist to a destination packet exchange and setting a call to a route with a large margin with the PVC(permanent virtual circuit) system. CONSTITUTION:A route setting section 10 is provided with a transmission data quantity memory 11 writing a transmission data quantity per unit time for each relay line and a transmission capacity memory 12 representing the transmission speed per unit time of the relay line for each relay line. Moreover, the route setting section 10 is provided with a margin calculation section 13 calculating an average transmission data quantity 11 per unit time from the preceding check up to now periodically, subtracting it from a transmission capacity 12 to calculate the transmission margin. Furthermore, the section 10 is provided with a margin comparison section 14 comparing the transmission margin of each line and informing a line with the largest margin and with a route reconnection section 15 resetting the route of the call by the PVC system to the line with the largest margin. Thus, the route setting time is reduced and the selection capability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a route selection method in a packet switching network, and in particular to communication links that are fixed at the time of joining the packet switching network between subscribers accommodated in different packet switching equipment. The present invention relates to a route selection method for link connection using the PVC method, which sets the link setting operation for each communication by omitting the link setting operation for each communication.

[Conventional technology]

In the conventional PVC call route selection method, the route selected at the time of call setup is used until the call is terminated.
The communication links that make up this set route are fixed and used until they are manually changed or a link line failure occurs.

[Problem to be solved by the invention]

The above-mentioned conventional PVC method external route selection method is configured to form a route using preset links, so the fixed link selected at the time of route selection is used for other calls, and the route setting time Even if the selection efficiency decreases due to an increase in the number of routes, there is a problem in that it is impossible to select other routes or links.

An object of the present invention is to provide a route selection method that solves the above problems.

[Means to solve the problem]

The route selection method of the present invention uses a PVC (permanent virtual circuit) method to select a call route using a PVC (permanent virtual circuit) method that fixes communication links between packet switches in a packet switching network that sets a route for each call and omits link setting operations for each communication. In this method, the amount of data per unit time of each route is periodically measured, the average data amount is calculated from the previous measurement value and the current measurement value, and the data amount per unit time of each route determined in advance is calculated. Calculate the transmission margin by subtracting,
It has a route setting unit that reconnects the route set by the PVC method to a route with a larger transmission margin.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, the route setting unit 10 of the packet switch 1 is
Each trunk line has a transmission data amount memory 11 in which the transmission data amount per unit time is written, and each trunk line has a transmission capacity memory 12 which indicates the transmission speed, that is, the transmission capacity per unit time of the trunk line. Also, route setting section 10
is a margin calculation unit 13 that calculates the transmission margin by periodically calculating the average transmission data volume 11 per unit time from the previous survey to this time and subtracting it from the transmission capacity 12, and calculates the transmission margin of each line. The margin comparison unit 14 compares the lines and notifies the line with the most margin, and further adds PVC to the line with the most margin.
Route connection switching unit 15 that reconfigures the call route according to the method
have.

If there is currently a line with a route set in the PVC system, the amount of data transmitted on this route is subtracted from the transmission capacity 12 to find the margin, and the same calculation is performed for lines with other routes.

The above two calculation results are compared, and if the latter is larger than the former, the link set in the PVC method as a route with margin is re-routed to another link with margin. If the former is larger than the latter,
Due to the PVC method, the link setting route remains unchanged.

〔Effect of the invention〕

As explained above, when there are multiple routes to a destination packet switch, the present invention provides
By calculating and comparing the transmission margins and setting a call using the PVC system to a route with a large margin, route setting time can be shortened and selection efficiency can therefore be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the route selection method of the present invention. 1...Packet switch, 2...Subscriber terminal, 3...Relay line, 10...Route setting section, 11...Transmission Data amount memory, 12
...Transmission capacity memory, 13... Margin calculation section, 14... Margin comparison section, 15...
...Route connection switching section.

Claims (1)

[Claims] In a call route selection method using the PVC (Permanent Virtual Circuit) method, in which a route is set for each call, communication links between packet switches are fixedly set, and the link setting operation for each communication is omitted in a packet switching network, each route is periodically set. Measure the amount of data per unit time, measure the average data amount from the previous measurement value and the current measurement value, and calculate the transmission margin by subtracting it from the data amount per unit time of each predetermined route. , a route selection method comprising a route setting unit that reconnects a route set by the PVC method to a route with a larger transmission margin.