JPS62274855A - Poute selection system for repeating exchange - Google Patents

Abstract

PURPOSE:To reduce the load on a repeating exchange and to display smooth functions by calculating the connection interrupting ratios of routes up to the ground to be connected, expressing the calculated values in a table, comparing the connection interrupting ratios of plural routes up to the ground at the time of selection of a route, and selecting an optimum route under prescribed conditions. CONSTITUTION:The titled system is provided with a connection interrupting ratio measuring means 5 for output line routes 3, an connection interrupting ratio table 51, an optimum route selecting means 6, and a connection control means 4 for driving these means. The means 5 inputs the connection information of the output lines 3 from the means 4 and sequentially measures the connection interrupting ratios of the routes including the output lines 3 to the terminating ground. The means 6 is connected with the table 51, indexes the connection interrupting ratio in each route from the ground information at the time of input of connected ground information from the means 4, selects one optimum route with a high connection interrupting ratio and outputs the selected route to the means 4. Consequently, the connection interrupting states of all routes of the output lines 3 to be connected to the ground are checked before the selecting procedure of the output lines 3 to select a route with a prescribed optimum condition.

Description

[Detailed description of the invention] & Detailed description of the invention [Industrial application field] The present invention relates to a route selection method for a transit exchange.

[Conventional technology]

The route selection method of conventional trunk exchanges employs the near-far rotation method (for example, Electronics and Communication Engineering, Ndobook, Institute of Electronics and Communication Engineers, Watohmsha, p., s 11). That is, each trunk exchange selects a route from the diagonal line to the farthest station along the backbone line system in the direction of the backbone line.

Referring to FIG. 2, the distance line method will be explained.

FIG. 2 is a schematic diagram showing an example of an exchange hierarchy and a line network configuration. In FIG. 2, exchange 01.02.

03 is the general office, exchanges 11, 21, 22, 31 are the central offices and exchanges 111, 211, 212, 221, 222,
311 is a central station. Central station 1 is in the band of general station 01.
1 and a central station 111, and the two bands of the central station 21 and central station 22 include central stations 211 and 212 and central stations 221 and 222, respectively, and the band of the central station 03 includes central stations 211 and 212 and central stations 221 and 222, respectively. are central station 31 and central station 3
11 are included. Routes 1, 2, and 3 that directly connect the general office comrades
, routes 11 and 2 in which the general station is directly connected to the central station within the same band.
1, 22, 31, and a route 111゜211.212, 221, 222 where the central station is directly connected to the central station within the same band.
, 311 are respective backbone lines, and the routes spanning between bands are diagonal lines.

In the route selection method using the perspective rotation method, for example, when the relay exchange at the central station 11 in FIG. Select the route 1121 to go through, and if the line of this route 1121 is cold, select the diagonal line 211 to the general office o2 on the upper level of the central station 21, and if the diagonal line 211 is cold, select the diagonal line 211 as the final selection. Backbone line 1
Select 1 one after another. As shown in FIG. 2, this selection order rotates in the direction of the arrow from the farthest station to successively closer stations on the trunk line path.

[Problem that the invention seeks to solve]

As mentioned above, the route selection method of conventional trunk exchanges is based on the near-far rotation method, so when abnormal traffic is concentrated between specific destinations, there are many chances that the first diagonal line selected will be left unused, and a small number of vacant lines will be lost. There is also a re-selection operation due to the simultaneous selection of , which increases the load on the relay exchange and makes it impossible to perform its functions smoothly.

[Means for solving problems]

In the route selection method of a trunk exchange according to the present invention, the trunk exchange has a communication rate measuring means for an outgoing line route, a communication rate table, a route selection means for an optimum route, and a connection control means that makes full use of these means. The communication rate measuring means inputs the connection information of the outgoing line from the connection control means and successively measures the communication rate of the route including the outgoing line to the destination. The communication rate table stores the communication rates input from the communication rate measurement means for each region and route.

The route selection means is coupled to the communication rate table, and when the connection destination ground information is input from the connection control means, the communication rate for each route is indexed from the ground information, and one of the optimal routes with a high communication rate is selected, and the connection control means Output to. The connection control means receives connection destination information when there is an incoming call from the incoming line, outputs it to the route selection means to obtain one of the optimal routes, and selects one of the outgoing lines included in the route obtained here. is selected and the connection information of the outgoing line up to connection to the destination ground is output to the communication rate measuring means.

Therefore, the trunk exchange examines the communication status of all routes of outgoing lines that can be connected to the destination before the outgoing line selection procedure, and selects a route that meets predetermined optimal conditions.

〔Example〕

Next, the route selection method of the trunk exchange according to the present invention will be explained with reference to the drawings.

FIG. 1 is a functional block diagram showing one embodiment of the present invention. In FIG. 1, a main switch 1 accommodates and connects an incoming line 2 through an incoming line circuit 21 and an outgoing line 3 through an outgoing line circuit 31, and the connections between the lines are controlled by a connection control means 4. . Incoming line 2 has route number 11.・・・・・・
・The route assigned route number 121 is also routed to the outgoing line 3.
has routes assigned route numbers 1°, . . . and route numbers 3.

The connection control means 4 is coupled with the communication rate measuring means 5 and the route selection means 6 to select a route for an incoming call from the incoming line 2. The communication rate measuring means 5 has a communication rate table that includes the number of attempts C1 for each destination number and route number, the number of circuit acquisition failures Bl, the number of missed calls to the outgoing destination B2. and the communication rate A are stored. The number of attempts C is the number of times the connection control means 4 attempts to select one of the outgoing lines 3, and the number of failures to capture the line B1 is the number of times when the outgoing line fails to capture the outgoing line 3 due to cold weather etc. Number of missed calls B
2 is the number of lost calls in which the relay exchange to which the outgoing line is connected fails to seize the line, and the coverage rate A is calculated from these numbers by the coverage rate measurement means 5 using (A = 1-(B1+B2)/C). It is a numerical value. When the connection control means 6-4 terminates the connection control, it assigns a destination number and a route number, and provides any of the following information as the outgoing line connection information: line acquisition failure, outgoing edge call loss, or connection completion to the connected destination. is notified to the communication rate measuring means 5. When the communication rate measuring means 5 receives the outgoing line connection information, it increments the number of attempts indexed from the destination number and the route number by one time, and calculates the number of failures in line acquisition and the number of lost optical calls on the received outgoing line. If so, it is incremented according to the outgoing line connection information, and then the coverage rate is calculated and the coverage rate 51 is corrected. When the route selection means 6 receives the destination number obtained from the called subscriber number via the connection control means 4, it determines the communication rate for each route number included in the area of the destination number from the communication rate unit 51 based on the received destination number. It is indexed as coverage rate information, and outputs, for example, the route number of one of the optimal routes with a high coverage rate to the connection control means 4 as selection result information. The connection control means 4 selects one of the outgoing lines 3 from the route having the route number output from the route selection means 6. Since the route notified by the route selection means 6 has a high communication rate, call loss is less likely to occur and reconnection operations are reduced. The route selection means 6 has a plurality of optimal route selection conditions, and one of them can be set artificially in advance, or computer control for automatic switching can be adopted.

In the above embodiment, the communication rate measuring means is included in the communication rate measuring means, and each means is illustrated as a central processing unit (111cPU, e.g. The processing functions of a microcomputer (microphone, microcomputer) are divided into blocks, and are not limited to the functional blocks illustrated and described above. The number of attempts, the number of failures in line acquisition, and the number of lost optical calls on the outgoing line illustrated and explained in the coverage rate can be stored in a separate storage device from the number of failures in line acquisition and the number of optical calls on the outgoing line. may be stored as a unified number of lost calls.

In order to obtain call loss information for the outgoing optical fiber, there is a procedure for transmitting call loss information from the called side to the calling side on the transmission path of the trunk exchange ladder, with the number of the called destination or switching center added. There are known techniques for signal addition and can be easily realized.

〔Effect of the invention〕

As explained above, the route selection method of the relay exchange of the present invention calculates the coverage rates of the routes leading to the connected destination and forms a table, and when selecting a route, compares the coverage rates of multiple routes to the destination. Since one route is selected from among the best routes under predetermined conditions, load distribution is always achieved, the occurrence of abnormal traffic and traffic concentration are avoided, and the relay exchange can operate smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a route selection method for a relay exchange according to the present invention, and FIG. 2 is a diagram showing an example of a relay exchange hierarchy and line network configuration. 1... Main switch, 2... Incoming line, 3
... Outgoing line, 4... Connection control means, 5
...... Communication rate measuring means, 6... Route selection means, 51... Communication rate clothing. Agent Patent Attorney Shinman Uchihara 1 Ward

Claims (1)

[Scope of Claims] One of the routes connecting to the destination ground and one of the outgoing circuits included in this route are selected and connected to the selected outgoing line through the incoming line from which the incoming call is received via the main switch. In a route selection method of a trunk exchange, the trunk exchange inputs connection information of an outgoing line and includes a communication rate measuring means for an outgoing line included in a route to a destination, and a communication rate measured by the communication rate measuring means. rate by region/
A communication rate table is stored for each route, and when connecting to this communication rate table and inputting destination ground information, the communication rate for each route is indexed from the ground information, and one of the optimal routes with a high communication rate is selected and output. a route selection means; upon receiving an incoming call from an incoming line, receiving destination ground information and outputting it to the selection means to obtain one of the optimal routes and selecting one outgoing line included in the route obtained here; and connection control means for outputting connection information of an outgoing line up to connection to a destination point to the communication rate measuring means.