KR100233239B1 - Loop-back configuration and control method for signaling test in atm switching system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a loopback signal point configuration and signal message processing method for relay call testing in an asynchronous transfer mode switch.

2. The technical problem to be solved by the invention

The present invention provides a loopback signal for testing a normal relay call processing function using a single ATM exchanger by adding a signal network configuration and a message change function for recognizing a signal message received through a loopback of a relay line link. To provide a point configuration and signal message processing method.

3. Summary of Solution to Invention

The present invention configures a virtual loopback signal point so that the virtual path channel identifier does not cause a collision, and adds a loopback processing function to the signal message processing function so as not to discard the message destined for loopback and received to another station.

4. Important uses of the invention

The present invention is used for the relay call test of ATM switch.

Description

Loopback Signal Point Configuration and Signal Message Processing Method for Relay Call Test in Asynchronous Transfer Mode Switch

The present invention relates to a loopback signal point configuration and signal message processing method for testing a Broadband-Integrated Service Digital Network (B-ISDN) relay call in an Asynchronous Trasfer Mode (ATM) switch.

Conventionally, a signal message loopback function is implemented through a single exchange using a narrowband all-electronic exchange for a relay call processing function. It defines two consecutive odd and even signal point codes as loopback signal points, and connects a relay line link containing the signal link associated with this signal point to manipulate one source and destination code of the looped signaling message. The test enables the normal relay call handling function.

In general, the network node interface (NNI) function of the normal B-ISDN could not be tested on its own without interworking with a separate device or another switch. Therefore, there is a need for a method for emulating a network situation until a network connecting several exchanges is established.

In an ATM switch using B-ISDN NNI signaling, the signaling network state operates normally when the conventional loopback method is used. However, when a relay call occurs, a virtual path channel identifier (VPCI: Virtual Path) is transmitted between neighboring nodes. There was a problem that call setup failed due to collision of Channel Identifier) values.

In order to solve the above problems, the present invention provides an upper user unit and a call processing function by adding a signal network data configuration and a message changing function to recognize a signal message received through a loopback of a relay line link. The object of the present invention is to provide a loopback signaling point configuration and signaling message processing method for testing a normal relay call processing function using a single ATM exchange without affecting the normal function of a lower layer.

1 is a block diagram illustrating an embodiment of a network node matching signaling method of an ATM switch according to the present invention.

2 is a signaling message structure diagram of a broadband integrated information network (B-ISDN) according to the present invention;

3 is an exemplary diagram illustrating a signal message processing procedure using a loopback function according to the present invention.

4 is a flowchart illustrating a signal message processing procedure in an MTP-3 signal message processing unit using a loopback function according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: ATM Central Switching Subsystem (ACS)

2: ATM Local Switching Subsystem (ALS)

In order to achieve the above object, the present invention provides a loopback signal point configuration and signal message processing method for relay call testing in an asynchronous transfer mode (ATM) switch,

A first step of selecting a signal link in a routing table based on a signal message received from a broadband integrated information network user unit and transmitting the selected signal link to an asynchronous delivery mode adaptation layer unit; And when the destination point of the signal message received from the asynchronous delivery mode adaptation layer unit is a local station, select the broadband integrated information network user unit as the service identifier of the signaling message, and transmit the signaling message to the corresponding broadband integrated information network user unit. A second step of changing the originating point code and the terminating point code of the signaling message and then selecting the broadband integrated information network user unit as the service identifier of the signaling message and transmitting a signaling message to the corresponding broadband integrated information network user unit if the dot is a loopback signal point. Include.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a block diagram illustrating an embodiment of a network node matching signaling method of an ATM switch according to the present invention.

The ATM switch to which the present invention is applied is composed of one ATM Central Switching System (ACS) 1 and a plurality of ATM Local Switching System (ALS) 2.

The central switching subsystem 1 is a connection between an operation maintenance processor (OMP) 11 that controls the entire system such as operation maintenance, network management, and path control, and each subscriber switching subsystem 2. It is provided with an internal switching network module (ISNM: Inter Switching Network Module) (12).

A plurality of subscriber switching subsystems (ALS) 2 includes a call connection control processor (CCCP) 21 that handles call control signaling, operation, and maintenance, and an access switch that performs a switching function. An access switching network module (ASNM) 22 and a plurality of trunk interface matching modules (TIMs) 23, which function to match relay line lines connected to a power station representing a node to communicate with. .

The call connection control processor 21 implements subscriber related blocks or relay line related blocks according to the characteristics of the subscriber switching subsystem 2.

Broadband Telecommunication Network (B-ISDN) Network Node Matching (NNI) signaling is an application protocol related to B-ISDN service, which generates a signal message to be transmitted to another signaling point and establishes a user data path associated with a call. -Signaling message transmission part that is responsible for the configuration and management function of the signaling network to reliably transmit the message of the B-ISDN user part (B-ISUP) (211) and the B-ISDN user part (211) Signal Transfer Part Level 3 (MTP-3), and the Signal ATM Adaptation Layer (SAAL) that controls the message flow of the signal channels that make up each signal link in the ATM network, and performs initial alignment and verification upon activation of the signal link. : Signaling ATM Adaptation Layer (213).

The signaling message transfer unit level 3 (MTP-3) is an MTP-3 signaling message processing unit (MTP-3 SMH: MTP) in the call connection control processor 21 that processes messages received from the B-ISDN user unit 211 or the network. -3 Signaling Message Handling (212), and the signal network management unit (MTP-3 SNM: MTP-3 Signaling Network Management) in the operation maintenance processor 11, which is responsible for the configuration and failure of the signal network. (111).

In the ATM switching system, the B-ISDN user unit 211, the MTP-3 signaling message processing unit 212, and the signal ATM adaptation layer unit 213, which require real-time processing in connection with actual message transmission, are connected to a call connection control processor (213). 21 is implemented in the operation and maintenance processor 11 of the central switching subsystem 1, which is redundantly implemented in 21) and requires the integrated management of the signal network components connected to each power station. .

The ATM switching system is interworked with other exchanges through the relay line matching module 23, and the signal link, which is a virtual path through which signaling messages are transmitted, is also transmitted from the call connection control processor 21 through the access switch network module 22 to the relay line matching module ( 23) and in the form of one virtual channel on the optical cable (not shown), and the data path is also set to the virtual channel through the relay line matching module 23 with another switch.

In order to configure a network with one exchange, an optical cable connected to the relay line matching module 23 to be connected to the power station is connected to another relay line matching module 23 of the local exchange and transmitted to the power station through the relay line matching module 23. Allow the message to be received at the local exchange via another relay line matching module 23.

2 shows a structure of a B-ISDN signaling message according to the present invention.

Each functional unit in the MTP-3 signaling message processing unit 212 receives a message of the same type from the B-ISDN user unit 211, where the received signaling message largely indicates the signal network to which the B-ISDN user and the signaling point belong. Service information octet (SIO) 20a consisting of bytes of data, routing table 20 consisting of 4 bytes of data representing an address value used to find a message path to be transmitted in MTP-3, It consists of the user data 23 to be delivered to the B-ISDN user portion 211 of.

The routing table 20 includes a destination point code (DPC) 20c composed of 14 bits for transmitting a signaling message, an originating point code (OPC) 20d composed of 14 bits for transmitting a signaling message, and an incoming call. It consists of a 4-bit Signaling Link Selection Code (SLS) 20e, which is a reference for selecting a path to share the load among several paths toward the point.

The MTP-3 signaling message processing unit 212 selects a path of the signaling message received from the B-ISDN user unit 211 or the MTP-3 signaling network management unit 111 to a corresponding destination, and sends the signaling message to the corresponding signal link. Checks the message routing unit 212d for transmission and the destination identification code of the message received from the network, and if it is a local message, transmits it to the message distribution unit 212a, and if it is another destination point, the message identification unit for transmission to the message routing unit 212d. 212b, and a message distribution unit 212a for transmitting a message to the corresponding B-ISDN user unit 211 when the message is received by the local station.

When the MTP-3 signaling message processing unit 212 transmits a signaling message directed to the loopback signaling point and is received by the local exchange again, the signaling message is a signaling message directed to the large station by the message identifying unit 212b, but the originating point is the local signaling. Is a bad message and is discarded.

Accordingly, a message recognized as a message transmitted from the message identification unit 212b to another station by adding a loopback message processing unit 212c so that such a signaling message is not discarded and can be recognized as a normal message to the B-ISDN user unit 211. In one case, if the called point of the message is a loopback signal point, the calling point code and the calling point code of the signaling message are changed.

3 illustrates an example of a signal message processing procedure using a loopback function according to the present invention, and illustrates a signal flow between the B-ISDN user unit 211 and the MTP-3 signal message processing unit 212.

First, a message 301 having a destination point b1 is generated in the B-ISDN user unit 211 and transmitted through a MTP-3 signaling message processing unit 212 to a signal link directed to the destination point b1, and loopbacks the received message. The signal message 302 through the other relay line matching module 23 is changed by the loopback message processing unit 212c in the MTP-3 signaling message processing unit 212 into a message 303 in which the origination point is b2 and the destination point is a B-ISDN. It is transmitted to the user unit 211.

The B-ISDN user unit 211 receives a message whose destination is its own country, and in response thereto, generates a message 304 having the destination point b2, and sends the message link to the destination point b2 through the MTP-3 signaling message processing unit 212. And the received message message 305 through another relay line matching module 23 is looped back by the loopback message processing unit 212c in the MTP-3 signal message processing unit 212, and the originating point is b1 and the called point is It is sent to the B-ISDN user part 211 in the native message 306. This initially becomes the response message 306 of the message 301 whose destination point generated by the B-ISDN user portion 211 is b1, and is normally processed by the B-ISDN user portion 211.

Here, a is a local signal point code, and the exchange should define a loopback signal point code having codes b1 and b2 as a destination point. When the codes of b1 and b2 are the same (that is, when one loopback signal point is defined and simulated), transmission and reception by one relay line matching module 23 causes the loopback message processing unit in the MTP-3 signal message processing unit 212. By the same loopback process by 212c, it is changed like a message from a large power, but the B-ISDN user unit 211 makes a request for the same data path in both directions, and this message is abnormally processed. You cannot continue the call test.

In the ATM network, the B-ISDN user unit 211 sets the virtual path channel identifier (VPCI) value to an even value when setting the data path between the stations, when the exchange setting the path has a larger signal point code than the station. If the signal point code is smaller than the power, set the odd values and avoid specifying the same values.

In the ATM exchange, as in the conventional TDX-10, when two consecutive numbers are used as the loopback signal point codes, both b1 and b2 become larger or smaller than a.

If b1 and b2 are greater than a, a signal message initially having an odd virtual path channel identifier (VPCI) and transmitted to the destination b1 is received from the b2 by the loopback function of the MTP-3 signaling message processing unit 212 to the local station. When the message is sent to the B-ISDN user unit 211 and the transmission point b2 of the signaling message has an odd VPCI value even though it is greater than a, the VPCI value is subsequently changed during the call processing to b2. May overlap.

Therefore, in the ATM exchange, when the loopback signal point is defined, the local signal point (a) is placed between the destination code (b1, b2), and the local signal point code minus the destination code is defined as the local signal point code from the destination point code (b2). The loopback processing function by the loopback message processing unit 212c in the MTP-3 signal message processing unit 212 is set by setting the destination point codes b1 and b2 to be equal to the value obtained by subtracting (a) (a-b1 = b2-a). The new destination code assigns a local signaling point code, and the new originating code assigns a value obtained by subtracting the local signaling point code from the destination code of the signaling message and adding the destination code again.

Therefore, the B-ISDN user unit 211 performs a normal procedure without changing according to the loopback state, and the MTP-3 signal message processing unit 212 also performs other functions normally by adding only the loopback state to the signal point information.

4 is a flowchart illustrating a signal message processing procedure in an MTP-3 signal message processing unit using a loopback function according to the present invention.

When a signal message is received from the B-ISDN user unit 211 or the MTP-3 signaling network management unit 111 (401), the call point code of the signaling message is checked to determine whether the signal point is available in the signal network data (402). ).

As a result, if the destination of the received message is unavailable, the received signal message is discarded (403). If the destination of the received message is available, the routing table 20 is based on the destination of the signaling message and the signal link selection code. The signal link is selected (404).

Thereafter, the relay line matching module, the virtual path identifier (VPI), and the virtual channel identifier (VCI) constituting the selected signal link are transmitted together with the signal message to the signal ATM adaptation layer unit 213 to which the signal link belongs (405).

On the other hand, when a signal message is received from the signal ATM adaptation layer unit 213 through the network (406), it is determined whether the destination point code of the signal message is the same as the originating point code of the local signal point (407).

As a result, if the called point code is the own signaling point code, the user part is selected as the service identifier of the signaling message (410) and the signaling message is transmitted to the B-ISDN user part 211 (411). If not, it is checked from the destination data table of the routing table 20 whether the destination is a loopback signal point (408).

If the destination point is not a loopback signal point, the destination network code of the signal message is checked to determine whether the signal point is available in order to transmit the signal message to another signal point (402). The calling point code and the called point code of the signaling message are changed (409). That is, the new called point code allocates the own signaling point code, and the new calling point code allocates the local calling point code from the called point code of the signaling message and adds the called point code again.

The subsequent signal message is in the form of a signal message received from the loopback signal point corresponding to the destination of one original signal message to the local signal point. The signaling message received at the local signaling point selects the B-ISDN user portion designated as the service identifier of the signaling message (410) and transmits the signaling message to the corresponding B-ISDN user portion (411).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

The present invention as described above, by configuring the network with a single ATM switch without changing the call processing function and the signal network management function, it is possible to check whether the function of the local exchange switch is normal at the time of initial system installation or operation. By assigning two large and small corresponding signal point codes as loopback signal points as a reference, it is possible to prevent duplicate assignment of virtual path channel identifiers (VPCIs) for data paths in the relay call processing function, enabling smooth call processing function test. There is.

Claims (8)

In the loopback signal point configuration and signal message processing method for relay call testing in an asynchronous transfer mode (ATM) exchange, A first step of selecting a signal link in a routing table based on a signal message received from a broadband integrated information network user unit and transmitting the selected signal link to an asynchronous delivery mode adaptation layer unit; And If the destination point of the signal message received from the asynchronous delivery mode adaptation layer unit is the own station, select the broadband integrated information network user unit as the service identifier of the signaling message, and transmit the signaling message to the corresponding broadband integrated information network user unit, and the destination of the signaling message A second step of changing a call point code and a called point code of a signaling message and then selecting the broadband integrated information network user unit as a service identifier of the signaling message, and transmitting a signaling message to the corresponding broadband integrated information network user unit; Loopback signal point configuration and signal message processing method comprising a. The method of claim 1, The first step is, A third step of checking a destination point code of a signal message received from the broadband integrated information network user unit to determine whether the signal point is available; And As a result of the third step determination, if the destination of the received signal message is unavailable, it is discarded. If the destination of the received signal message is available, the signal link is selected from the routing table, and the signal link belongs to the asynchronous delivery mode adaptation layer. Fourth step of sending a signaling message Loopback signal point configuration and signal message processing method comprising a. The method according to claim 1 or 2, The second step, A fifth step of determining whether a destination point code of a signal message received from the asynchronous delivery mode adaptation layer unit is identical to an origination point code of a local signal point; A sixth step of transmitting the signal message by selecting the user equipment of the broadband integrated information network using the service identifier of the signal message if the called point code is the same as the local signal point code; A seventh step of determining whether the called point is a loopback signal point if the called point code is not the same as the own signal point code; And As a result of the seventh step, if the called point is not the loopback signal point, the signal link is selected from the routing table based on the signaling message and transmitted to the asynchronous delivery mode adaptation layer. If the called point is the loopback signal point, the calling point code and the called point code are transmitted. An eighth step of transmitting the signal message by selecting the user part of the broadband integrated information network after the change; Loopback signal point configuration and signal message processing method comprising a. The method according to claim 1 or 2, The loopback signal point of the second step is Assign the own station signal point code between the two destination code and assign the destination code so that the value of the local station code minus the destination code is the same as the destination point code minus the local signal point code. Loopback signal point configuration and signal message processing method characterized in that the value is set so as not to cause a collision. The method of claim 4, wherein The destination code change process of the second step is A loopback signal point configuration and signal message processing method comprising changing a called point code to a local signal point code. The method of claim 5, The calling point code changing process of the second step is A method for loopback signaling point construction and signal message processing comprising subtracting a local signaling point code from a terminating point code of a signaling message and assigning the sum of the destination point code to a calling point code. The method of claim 6, The signal message is A service information octet representing the signal network to which the broadband integrated information network user and the signal point belong, a routing table used to find a message path to be transmitted by the signal message transmission unit, and user data to be transmitted to the broadband integrated information network user unit of a large country. Loopback signal point configuration and signal message processing method characterized in that the. The method of claim 7, wherein The routing table, Loopback signal point configuration and signal message, characterized in that consisting of the destination code to be sent to the signal message, the origin code to send the signal message, and the signal link selection code that is a reference for selecting the corresponding path from the various paths to the destination Treatment method.

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