KR20030008986A - Method of Managing Status of Sub-routes in the ATM Exchange - Google Patents

Abstract

PURPOSE: A method for managing the state of a sub-route in an ATM(Asynchronous Transfer Mode) switch is provided to resolve the inconsistency of a sub-route state between local and remote station systems through a periodic test. CONSTITUTION: If a time elapses by a predetermined period(S1), a local station-side RTAF(Route Status Administration Function) retrieves the state of system resources which have an influence on the state of a corresponding sub-route resource(S2). The local station-side RTAF notifies the state of the retrieved each sub-route to a local station-side LIBMCF(Library of Maintenance Function)(S3). The local station-side LIBMCF receives the state of each sub-route from the local station-side RTAF and registers the state of each sub-route(S4). The local station-side LIBMCF generates a sub-route state management message such as a blocking message, an unblocking message, and a reset message, and transmits the sub-route state management message to a local station-side SMHF(Signaling Message Handling Function)(S5). The local station-side SMHF receives the sub-route state management message from the local station-side LIBMCF in an MTP(Message Transfer Protocol) layer, and confirms a valid path(S6). The local station-side SMHF transmits the sub-route state management message to a remote station system through the confirmed each valid path(S7). An SMHF of the remote station system receives the sub-route state management message in an MTP layer, confirms the received sub-route state management message, and transmits the sub-route state management message to a remote station-side RTAF(S8). The remote station-side RTAF receives the sub-route state management message through the remote station-side SMHF and notifies the remote station-side sub-route state to a remote station-side LIBMCF(S9). The remote station-side LIBMCF reflects the local station-side sub-route state to its system(S10). The remote station-side LIBMCF generates and transmits an acknowledgement message to the local station-side through the remote station-side SMHF(S11).

Description

How to Manage Sub-Route Status in ATM Switch {Method of Managing Status of Sub-routes in the ATM Exchange}

The present invention relates to a sub-route state management method in an ATM switch, and more particularly, to a sub-route state management method in an ATM switch that resolves a sub-route state mismatch between a host and a power system through periodic tests.

In general, a route at an ATM exchange is a path to a specific exchange as a logical message transfer path of an exchange, and a subroute belongs to the route and may actually have multiple subroutes in one route. . And, the sub route is a passage through which relay data passes, and data transmission and reception is normally performed only when the state of the corresponding passage is normal. If the state of the sub route is abnormal, data transmission and reception is performed through another sub route or another path. To lose.

The state of the sub-route should be managed in the same way as the state of the host system and the state of the power system. If the power is normally managed in the own station and abnormally managed in the power station, a state mismatch may occur. do.

Therefore, in order to manage the state of the subroute, it is necessary to manage the state of the subroute between systems using a standardized cell recommended by ITU-T, and the message used for the state management is a blocking message (BLK). ), An unblocking message (UBLK), and a reset message (RESET).

In order to manage the state of the subroute, the MTP (management of the subroute between systems and the transmission and reception of messages between systems while transmitting and receiving the blocking message (BLK), the unblocking message (UBLK) and the reset message (RESET) ( Message Transfer Protocol) and the messages that are transmitted and received can be divided into parts that perform state management of the subroute. Here, the MTP refers to a protocol that is responsible for transmitting and receiving signaling and other messages transmitted and received between switching systems.

As shown in FIG. 1, the configuration for managing the sub-route state in the conventional ATM exchange includes RTAFs 11 and 21, which are software blocks for performing the state management function of the sub-route in each switching system 10 and 20. LIBMCFs 12 and 22, which are library software blocks related to system maintenance, and SMHFs 13 and 23, which are software blocks that transmit and receive signaling messages between the exchange systems 10 and 20, respectively.

The local station RTAF 11 detects a change in the state of the subroute when a subroute state change factor occurs, and notifies the LIBMCF 12 of the local station side of the subroute state change.

The LIBMCF (12) responsible for MTP is responsible for MTP by generating a blocking message (BLK), an unblocking message (UBLK), and a reset message (RESET) after registering the subroot status change by notification of the RTAF (11). It transmits to the SMHF 13, and receives the response message (Ack) from the SMHF (13) so that the state management is made.

The local station SMHF 13 receives the blocking message BLK, the unblocking message UBLK, and the reset message RESET from the LIBMCF 12 of the local station to confirm a valid path, and checks the valid path. The state change message is transmitted to the counter-side switching system 20, and a response message (Ack) is received from the counter-side switching system 20 and transmitted to the LIBMCF 12 of the corresponding station.

The counterpart RTAF 21 receives the state change message through the counterpart SMHF 23 and requests the state change to the LIBMCF 22 of the counterpart side.

The receiving station LIBMCF 22 receives a state change request from the RTAF 21 of the corresponding country, registers a sub-route state change, and transmits a response message (Ack) to the SMHF 23 of the corresponding country.

The SMHF 23 on the counter side receives the state change message transmitted from the host side exchange system 10 to the RTAF 21 on the counter side, and sends a response message from the LIBMCF 22 on the counter side. ) Is received and transmitted to the local exchange system 10.

Referring to the flowchart of FIG. 2, a method for managing a sub route state in an ATM switch configured as described above is as follows.

The state change of the subroute is made in accordance with the state change of the upper element of the switching system, that is, the state of the subroute can be changed according to the state of the own station and the power station. At this time, when the state change factor of the sub route occurs, the host side RTAF 11 detects the state change of the corresponding sub route, and notifies the sub-root state change to the host LIBMCF 12 (step T1).

Accordingly, the local LIBMCF 12 is notified of the sub-root state change from the local RTAF 11 and registers the sub-route state change, and then the blocking message BLK, the unblocking message UBLK, and the reset message RESET. ) Is sent to the local station side SMHF 13 (step T2).

Accordingly, the local station SMHF 13 receives the blocking message BLK, the unblocking message UBLK, and the reset message from the local station LIBMCF 12 at the MTP layer to identify a valid path. The state change message is transmitted to the counter-side switching system 20 via the confirmed valid path (step T3).

Then, the SMHF 23 of the exchange side exchange system 20 receives the state change message transmitted from the slave side exchange system 10 at the MTP layer and transmits the state change message to the RTAF 21 on the side of the station (step T4). The RTAF 21 of the station side receives the state change message through the SMHF 23 of the station side and requests the state change to the LIBMCF 22 of the station side (step T5).

Accordingly, the LIBMCF 22 receiving the state receives a state change request from the RTAF 21 of the station, registers a sub-route state change, and generates a response message Ack to transmit to the SMHF 23 of the station side. (Step T6), the SMHF 23 of the station side receives the response message Ack from the LIBMCF 22 of the station side and transmits the response message Ack to the local station exchange system 10 (step T7).

Accordingly, the SMHF 13 of the local exchange system 10 receives the response message Ack from the large exchange system 20 and transmits the response message Ack to the local LIBMCF 12 (step T8). The local station LIBMCF 12 receives a response message (Ack) from the local station SMHF 13 so that the state management of the subroute is performed.

In addition, the state management of the sub-route consists of a normal state (NORM), a blocking state (BLK), a local station abnormal state (LCL_BLK), a large station abnormal state (RMT_BLK), and the like. This is possible. Here, the normal state (NORM) refers to the normal state capable of transmitting and receiving data, the blocking state (BLK) refers to the blocking state that the data transmission is not possible at the request of the user, the corresponding local station abnormal state (LCL_BLK) is the local station resources The abnormal state in which data transmission / reception is impossible due to an abnormal state, and the corresponding abnormal state state (RMT_BLK) refers to an abnormal state in which data transmission / reception is impossible due to an abnormality of a power resource.

However, the state management of the sub-root as described above is performed by transmitting and receiving the blocking message BLK, the unblocking message UBLK, and the reset message RESET in the state management block of the host and the power system. If a message is lost or if the message is delivered without guaranteeing the order of sending and receiving the message, a sub-route state mismatch occurs between the local station and the power system. If such a mismatch occurs, data transmission and reception may occur normally. There was a problem of disappearing.

In the related art, when a subroutine state management mismatch occurs, the subroute where the mismatch occurs cannot be used until the inconsistency resolution condition is resolved. If the super system manages abnormally, the own station system transmits data to the corresponding subroute, but because the sub route of the actual super system system is abnormal, the transmitted data cannot be received from the super system system. Retransmission is required, which causes a problem of increasing network load.

In order to solve the above problems, the present invention relates to a sub-route state management function of the ATM exchange, and the sub-route state in the ATM exchange for resolving sub-route state mismatch between the own station and the power system through periodic tests. To provide a management method, the purpose is.

In addition, the present invention by matching the sub-route between the local station and the power system through the periodic message transmission and reception at the ATM switch, it is possible to maintain a continuous state and to manage the resources normally to solve the system load and network load The purpose of the present invention is to improve the reliability of the system by ensuring normal data transmission and reception.

1 is a block diagram illustrating a configuration for sub-route state management in a conventional Asynchronous Transfer Mode (ATM) exchange.

2 is a flowchart illustrating a sub route state management method in a conventional ATM switch.

3 is a flowchart illustrating a sub route state management method in an ATM exchange according to an embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

10, 20: exchange system

11, 21: RTAF (Route Status Administration Function)

12, 22: LIBMCF (Library of Maintenance Function)

13, 23: Signaling Message Handling Function (SMHF)

In the ATM switch according to the embodiment of the present invention for achieving the above object, the sub-route state management method retrieves the system resource state for all sub-roots of the own system at regular intervals, and converts each sub-route state to the corresponding power system. Transmitting to; Transmitting a response message to the local host system after reflecting the sub-root state of the local station in the large power system; Receiving the response message from the local system and matching the status information of each sub-route.

Preferably, each sub-route status transmission process includes: searching and notifying the system resource status to all sub-roots of the local system at regular intervals; Generating a sub-route state management message after registering the state of each sub-route; Identifying valid paths corresponding to the respective subroutes; And transmitting the sub route status management message to the power system corresponding to each sub route through the respective valid paths. The searching and informing of the system resource state may include detecting and notifying a change in state of the corresponding subroute when a subroute state mismatch occurs between the host system and the power system.

Preferably, the step of transmitting the response message includes receiving and confirming the sub-route state management message and notifying the sub-route state of the local station; Reflecting the slave side sub-root state to its own system; Generating a response message and transmitting the generated response message to the local system. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the ATM switch according to the embodiment of the present invention, the configuration for managing the sub-route state is the same as the conventional technology, and thus the description thereof is omitted, but it may be caused by the loss of the message in the MTP layer, an error in the message transmission and reception order, and the like. In order to resolve the sub-root status mismatch between the systems, the local system periodically generates sub-root status management messages such as blocking message (BLK), unblocking message (UBLK), reset message (RESET), etc. It is made to match the state of the subroute which the inconsistency has occurred.

Referring to the flowchart of FIG. 3, a method for managing a sub route state in an ATM switch according to an embodiment of the present invention is as follows.

In order to match the status of the subroute existing between the own system and the power system, the RTAF of the own system periodically affects the state of the sub-root resource for all sub-roots present in that system, e.g. every 1 minute. To retrieve the system resource status.

In other words, in the local RTAF, after checking whether a predetermined period of time has elapsed (step S1), when the time for the predetermined period has elapsed, the state for all sub routes, that is, for all sub routes, is determined. The system resource status that affects the status of the sub-root resource is searched (step S2), and the LIBMCF of the own station is notified of the status of each searched sub-root (step S3). At this time, if a subroute state mismatch occurs between the local system and the counterpart system due to a message loss or an error in message transmission order in the MTP layer, the state change of the subroute is detected and notified to the corresponding LIBMCF. give.

Accordingly, the local LIBMCF is notified of each subroot status from the local RTAF and registers each subroot status (step S4), and then a blocking message BLK, an unblocking message UBLK, a reset message RESET, and the like. The same sub-root status management message is generated and transmitted to the local station's SMHF (step S5).

Accordingly, the local side SMHF receives the sub-root state management message from the local-side LIBMCF at the MTP layer and confirms valid paths corresponding to each sub-route, respectively (step S6), and corresponds to the sub-root state management message. Through the identified valid paths, the transmission is transmitted to the corresponding power system corresponding to each sub route (step S7).

Then, the SMHF of the power system receives the sub-route status management message transmitted from the host system in the MTP layer, and confirms what message is transmitted to the power station RTAF (step S8). The sub-root status management message is received through the SMHF on the side, and the sub-root status on the host side is notified to the LIBMCF on the counterpart side (step S9).

Accordingly, the station-side LIBMCF receives the station-side subroute state through the station-side RTAF and reflects the station-side subroute state to its own system (step S10), and then generates a response message (Ack) to generate the game station. The host system transmits the information to the host system via the side SMHF (step S11).

Accordingly, the SMHF of the local system receives a response message (Ack) from the large power system, checks which subroutine is a response message, and transmits it to the LIBMCF on the local station side (step S12). Receiving a response message (Ack) from the SMHF of the own station, the registered state of the checked subroute is read to confirm that the subroute state information between the own station system and the power station system matches (step S13).

Thereafter, the RTAF of the local system checks again whether the predetermined period of time has elapsed, and then repeats the above-described operation. By performing a periodic test in this manner, It is possible to solve the inconsistency of the sub-root resource which may occur due to the message loss or the error of the message transmission order, thereby improving the reliability of the system.

As described above, by matching the sub-route state between the host and the power system through periodic tests according to the present invention, continuous state management is possible, and resource management is normally performed to solve system load and network load. And it can improve the reliability of the system by ensuring normal data transmission and reception.

Claims (4)

Retrieving system resource states for all subroots of the own system at every predetermined period and transmitting the respective subroot states to the corresponding power system; Transmitting a response message to the local host system after reflecting the sub-root state of the local station in the large power system; Receiving the response message from the local system and matching the state information of each sub-route. The method of claim 1, Each of the subroot status transmission steps may include searching and notifying the system resource status of all subroots of the own system at regular intervals; Generating a sub-route state management message after registering the state of each sub-route; Identifying valid paths corresponding to the respective subroutes; And transmitting the sub route status management message to the power system corresponding to each sub route through the respective valid paths. The method of claim 2, The searching and notifying the system resource state may include detecting and notifying a change in state of a corresponding subroute when a subroute state mismatch occurs between a host system and a counterpart system. . The method of claim 1, The transmitting of the response message may include: receiving and confirming the sub-route state management message and notifying the sub-route state of the local station; Reflecting the slave side sub-root state to its own system; And generating a response message and transmitting the generated response message to the local system.