JP2003111116A - Line concentrator system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a line concentrator system in which use frequency of respective bypass connection lines can be equalized and a line having a redundancy can be selected. SOLUTION: The determining means 111 of a CPU 11 in a concentrator 1 determines whether traffic bypass is effected or not, and a bypass connection record storing means 112 stores the bypass connection record of each bypass connection line 121-12n to an IP network 4. A line selecting means 113 selects a line of the lowest use frequency from the bypass connection record, a service state managing means 114 manages the service state of each bypass connection line 121-12n to an IP network 4, and a trouble state managing means 115 manages the trouble state of each bypass connection line 121-12n to an IP network 4. A bypath selection means 116 selects a bypath according to a data base in the concentrator 1 and a call information converting means 117 converts call information according to the bypath.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line concentrator system, and more particularly to line selection control in a line concentrator system having a traffic bypass function that enables bypass connection to a communication network other than a public exchange.

[0002]

2. Description of the Related Art Conventionally, in a concentrator system having a traffic bypass function of this kind, as shown in FIG. 5, a concentrator 21, a public exchange 22 and a public telephone network 2 are used.
3, a communication network 24 other than the public exchange, and a subscriber terminal 2
5-1 to 25-n. Concentrator 21
Means 21 for deciding whether to perform traffic bypass
A CPU (Central Processing Unit) 211 including 1a and a memory 2
12 and TDSW (time division sw)
It) 213.

The subscriber terminals 25-1 to 25-n are housed in the aggregator system 21 and connection lines 311 to 31n are connected to the public telephone network 23 via the public exchange 22.
Bypass connection lines 321 to 32 connected to a communication network 24 other than the public exchange 22 by traffic bypass
n is connected to either.

Therefore, these subscriber terminals 25-1 to 25-1
Among the calls originated from 25-n, the call selected to be connected to the public exchange 22 by the deciding means 211a for deciding whether to perform traffic bypass is the connection line 3
Connected to the public exchange 22 by 11 to 31n,
All calls that are decided to be subjected to traffic bypass do not go through the public exchange 22 and are bypassed by the bypass connection line 32.
1 to 32n directly connect to another communication network 24.

The bypass connection lines 321 to 32n may have a plurality of lines depending on the traffic of the subscriber terminals 25-1 to 25-n. When there are multiple lines, it is necessary to equalize the frequency of use of each bypass connection line and select a line with redundancy.

If all the bypass connection lines to the other communication network 24 are unavailable due to no idle call channels on the bypass connection lines 321 to 32n or failure, connect to the other communication network 24. There is a concern that you cannot do it.

[0007]

In the above-described conventional concentrator system, line selection is performed in consideration of frequency of use, idle call channel state, and fault state when selecting a line for a bypass connection line to another communication network. Therefore, when there are a plurality of bypass connection lines to other communication networks other than the public exchange, there is a problem that it is not possible to select a redundant line.

Further, in the conventional concentrator system, in the traffic bypass, since the bypass connection for connecting to the other communication network via the public exchange is not performed, all the bypass connection lines to the other communication networks are free. If there is no communication channel or if it is unavailable due to a failure, there is a problem that the call to the traffic bypass is rejected even though the connection line to the public exchange is available.

Therefore, an object of the present invention is to solve the above problems and to provide a concentrator system capable of equalizing the frequency of use of each bypass connection line and selecting a line with redundancy. .

[0010]

A concentrator system according to the present invention comprises a concentrator installed between a public exchange and a subscriber terminal and concentrating a connection line between the public exchange and the subscriber terminal. A line having a traffic bypass function that accommodates a connection line to another communication network other than the public exchange and enables a bypass connection to the other communication network according to the content of a connection request from the subscriber terminal. In the device system, storage means for storing a bypass connection history of each bypass connection line to the other communication network, and each bypass connection line stored in the storage means at the time of bypass connection of the other communication network The bypass connection history is referred to, and a selecting means for selecting a line that is least frequently used is provided.

That is, the concentrator system of the present invention is
In a concentrator system having a traffic bypass function that enables bypass connection to other communication networks other than public exchanges, means for storing the bypass connection history of each bypass connection line to other communication networks and other communication At the time of bypass connection of the network, the bypass connection history of each bypass connection line stored in the above-mentioned means is referred to, and the line having the least frequency of use is selected.

In this method, since the least frequently used number is selected in the line selection of the bypass connection lines to other communication networks, it is possible to select each bypass connection line evenly. .

Further, in the concentrator system of the present invention, means for managing the call state of each bypass connection line to another communication network, and means for managing the failure state of each bypass connection line to another communication network. By having the above, it is characterized in that the bypass connection line that has no available call channel or is in failure in selecting a connection line to another communication network is not selected.

In such a method, in the bypass connection line to the other communication network, the line selection is provided only by the line which can be always connected. Therefore, in the line selection of the bypass connection line to the other communication network. It is possible to secure redundancy.

Further, in the concentrator system of the present invention,
It is characterized by having means for selecting a detour route according to a database inside the aggregation device and means for converting call information according to the selected detour route.

In such a method, if all bypass connection lines to other communication networks have no empty call channels, or if there is no bypass connection line to be selected due to a failure, the bypass route via the public switching center Since it is possible to make a detour connection to the communication network, it is possible to ensure redundancy in the traffic bypass function.

As described above, when a plurality of connection lines to a communication network other than the public exchange office are provided, a mechanism for selecting a line in consideration of frequency of use, idle call channel state, and fault state, and public exchange By implementing a mechanism for performing a bypass connection for connecting to another communication network via a station, it becomes possible to equalize the frequency of use of each bypass connection line and to select a line with redundancy.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a concentrator system according to an embodiment of the present invention. In FIG. 1, a concentrator system according to an embodiment of the present invention is a concentrator system that realizes traffic bypass.

A concentrator system according to an embodiment of the present invention includes a concentrator 1, a public exchange 2, a public telephone network 3, and an IP (Internet) which is a communication network other than the public exchange.
tProtocol) network 4 and subscriber terminals 5-1 to 5-
n.

The line concentrator 1 is installed between the public exchange 2 and a plurality of subscriber terminals 51 to 5n, and connects to the IP network 4 other than the public exchange 2 as a bypass connection destination by traffic bypass. An access server (not shown) connects to the IP network 4 for data communication.

Connection lines 111 to 11n connecting the line concentrator 1 and the public exchange 2 and subscriber terminals 5-1 to 5-n.
The connection lines 101 to 10n for connecting the
SDN (Integrated Services D)
digital network). Further, the bypass connection lines 121 to 12n for connecting the IP network 4 and the concentrator 1 are also provided by ISDN lines.

The concentrator system 1 includes a CPU (central processing unit) 11 that operates under program control, and a memory 1 that holds a database in which detour processing information is stored in advance.
2 and subscriber terminals 5-1 to 5 under the control of the CPU 11
-N and a TDSW (time division switch) that connects a speech path between the public exchange 2 and the IP network 4
ch) 13.

From the bypass connection history, the CPU 11 determines the decision means 111 for deciding whether or not to perform traffic bypass, the bypass connection history storage means 112 for storing the bypass connection history of each of the bypass connection lines 121 to 12n to the IP network 4. A line selection means 113 for selecting a line that is least frequently used and each bypass connection line 121 to the IP network 4.
To 12n call state management means 114 for managing the call state.
And a failure state management unit 115 that manages a failure state of each bypass connection line 121 to 12n to the IP network 4, a detour route selection unit 116 that selects a detour route according to a database inside the aggregation device 1, and a detour route. Call information conversion means 117 for converting call information according to the above.

When a call is originated from any of the subscriber terminals 5-1 to 5-n, the concentrator 1 determines by the deciding means 111 whether or not to perform traffic bypass. When the traffic bypass is performed, the bypass connection lines 121 to 12n connecting the IP network 4 and the concentrator 1 and the subscriber terminal 5 are connected.
Connection line 101 for connecting the line concentrators 1 to 5-n
The communication path is connected at 10 to 10n and the IP network 4 is connected.

As the operation of connecting the speech path in the concentrator 1, first, when the deciding means 111 decides that there is traffic bypass, the call state managing means 11
The call state of each of the bypass connection lines 121 to 12n to the IP network 4 managed by 4 and the fault state of each of the bypass connection lines 121 to 12n to the IP network 4 managed by the fault state management means 115 are read out. I do. From the read call status and failure status, the bypass connection line that has no free call channel or is in failure is not selected. As a result, in this embodiment, it is possible to provide the line selection targeting only the usable bypass connection lines.

Bypass connection lines 121 to 1 to the IP network 4
As the operation of selecting the 2n line, first, the bypass connection history of each of the bypass connection lines 121 to 12n to the IP network 4 stored in the bypass connection history storage means 112 is read out, and from the read bypass connection history. The line selection means 113 selects the connection line that is least frequently used. By instructing the TDSW 13 from the CPU 11 to connect the call path between the bypass connection line selected by this line selection and the connection line on the subscriber terminal side, the subscriber terminals 5-1 to 5 that have made a call to the IP network 4 -N can be connected.

If all the bypass connection lines 121 to 1
When 2n has no free call channel or is not selected due to a failure, the detour processing information is read from the memory 12, and the detour path selecting means 116 selects the detour path and the connection line from the read detour processing information. A selection is made, and the call information conversion means 117 converts the call information according to the detour route.

The CPU 1 connects the call path between the connection line selected from the bypass processing information and the connection line on the subscriber terminal side.
1 to the TDSW 13, the connection line 111
11n via the public exchange 2 and public telephone network 3
It is possible to provide a detour connection on a detour path for connecting to the P network 4.

FIG. 2 is a flow chart showing the selecting operation of the connection method according to the embodiment of the present invention, FIG. 3 is a flow chart showing the connecting operation in the bypass connection line according to the embodiment of the present invention, and FIG. 6 is a flowchart showing a connection operation on a bypass route according to an embodiment of the invention. The operation of the concentrator system according to the embodiment of the present invention will be described with reference to FIGS.

For example, from the subscriber terminal 5-1 to the connection line 1
When a call is originated using 01, the concentrator 1 determines whether the traffic bypass is performed by the determining means 111. As a result, when it is determined that the traffic bypass is performed, the CPU 11 of the concentrator 1 has the call state management means 11
The call state of each bypass connection line 121 to 12n to the IP network 4 managed by the network 4 is read (step S1 in FIG. 2), and it is determined from the read call state whether there is a free call channel (step S1). 2 step S2).
As a result of this determination, the bypass connection line that is determined to have no available speech channel is not selected in line selection (step S3 in FIG. 2).

Next, the CPU 11 is the failure state management means 11
The fault status of each of the bypass connection lines 121 to 12n to the IP network 4 managed by 5 is read (step S4 in FIG. 2), and it is determined from the read fault status whether or not there is a fault (FIG. 2). 2 step A5). As a result of this determination, the bypass connection line determined to be in failure is not selected in line selection (step S in FIG. 2).
6).

The CPU 11 determines whether or not there is a selectable line among the bypass connection lines 121 to 12n to the IP network 4 (step S7 in FIG. 2). If there is a selectable line, the bypass connection line 121 to the IP network 4
~ 12n connection is selected (Fig. 2 step S
8) If there is no selectable line, the connection by the bypass route is selected (step S9 in FIG. 2).

Bypass connection lines 121 to 1 to the IP network 4
When the connection by 2n is selected, the CPU 11 reads the bypass connection history of each bypass connection line 121 to 12n stored in the bypass connection history storage means 112 to the IP network 4 (step S11 in FIG. 3). From the read bypass connection history, the line selection means 113 selects the least frequently used bypass connection line (step S12 in FIG. 3).

For example, when the bypass connection line 121 is selected as the bypass connection line, the CPU 11 instructs the TDSW 13 to connect the communication path between the connection line 101 and the bypass connection line 121 (step S1 in FIG. 3).
3). As a result, the subscriber terminal 5-1 can make a bypass connection with the IP network 4.

When the connection by the bypass route is selected, the CP
U11 reads the bypass processing information from the memory 12 (step S21 in FIG. 4). The CPU 11 selects a bypass route by the bypass route selection means 116 from the read bypass route information, and determines a connection line (step S in FIG. 4).
22). In order to connect to the IP network 4 by the selected alternative route, the call information converting means 117 converts the call information into the call information according to the alternative route (step S2 in FIG. 4).
3).

For example, the connection line 1 is used as a detour route line.
When 11 is selected, the CPU 11 instructs the TDSW 13 to connect the communication path between the connection line 101 and the connection line 111 (step S24 in FIG. 4). As a result, the subscriber terminal 5-1 can make a detour connection with the IP network 4 via the public exchange 2 and the public telephone network 3 by a detour route.

As described above, in this embodiment, the bypass connection lines 121 to 12n to the IP network 4 store the bypass connection history, manage the call status, and manage the failure status.
By selecting a line based on the stored and managed information, the bypass connection lines 121 to 121 with the IP network 4 are connected.
If you have multiple 12n lines, you can
The line can be selected in consideration of the fault condition. As a result, the line selection in the bypass connection can be made redundant.

Further, in the present embodiment, when all the bypass connection lines 121 to 12n to the IP network 4 have no available communication channels or are unavailable due to a failure,
All bypass connections to the IP network 4 by selecting a detour route according to the detour processing information registered in the database inside the concentrator 1, determining a connection line, and converting call information according to the detour route. Even when the lines 121 to 12n have no available call channels or are unavailable due to a failure, the detour connection to the IP network 4 via the public exchange 2 can be performed.

[0039]

As described above, according to the present invention, a concentrator installed between the public exchange station and the subscriber terminal and concentrating the connection line between the public exchange station and the subscriber terminal can be used in addition to the public exchange station. In a concentrator system having a traffic bypass function that accommodates a connection line to another communication network and enables bypass connection to another communication network according to the content of a connection request from a subscriber terminal, another communication network By storing the bypass connection history of each bypass connection line to each, and referring to the stored bypass connection history of each bypass connection line to select the line that is least used during bypass connection of other communication networks, As a result, it is possible to equalize the frequency of use of the bypass connection lines and select lines with redundancy.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a concentrator system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a selecting operation of a connection method according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a connection operation in a bypass connection line according to an embodiment of the present invention.

FIG. 4 is a flowchart showing a connecting operation in a bypass route according to an exemplary embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a concentrator system according to a conventional example.

[Explanation of symbols]

1 concentrator 2 public exchange 3 public telephone network 4 IP network 5-1 to 5-n Subscriber terminal 11 CPU 12 memories 13 TDSW 101-10n, 111-11n connection line 111 determination means 112 Bypass Connection History Storage Means 113 Line selection means 114 Call state management means 115 Failure status management means 116 Detour route selection means 117 Call information conversion means 121-12n bypass connection line

Claims (3)

[Claims] 1. A concentrator installed between a public exchange and a subscriber terminal and concentrating a connection line between the public exchange and the subscriber terminal allows communication to other communication networks besides the public exchange. A concentrator system having a traffic bypass function for accommodating a connection line and enabling a bypass connection to the other communication network according to the content of a connection request from the subscriber terminal, to the other communication network. The storage unit that stores the bypass connection history of each bypass connection line and the bypass connection history of each bypass connection line that is stored in the storage unit during the bypass connection of the other communication network A concentrator system comprising: a selecting unit for selecting a line. 2. A means for managing the call state of each bypass connection line to the other communication network when the bypass connection by the connection line to the other communication network is selected, and a means for managing the call state of the bypass connection line to the other communication network. Means for managing a failure state of each bypass connection line, and in selecting a connection line to the other communication network, at least one of a bypass connection line having no idle call channel and a bypass connection line in failure is not selected 2. The concentrator system according to claim 1, wherein a bypass connection line that can be always connected is selected as a target. 3. When the bypass connection by the connection line to the other communication network is selected, all the bypass connection lines to the other communication network are selected by either one of no idle call channel and failure. If there is no target bypass connection line, including means for selecting a bypass route according to preset bypass processing information and means for performing conversion of call information according to the selected bypass route, all to the other communication network. 3. The concentrator system according to claim 2, wherein a bypass connection to the other communication network is made by a bypass path passing through the public exchange when the bypass connection line of is not available.