KR20040046849A - Method for Soft PVC Service in Exchange System - Google Patents

Abstract

PURPOSE: A soft PVC(Permanent Virtual Connection) service method in a switching system is provided to cancel a preset soft PVC call if data traffic has a failure owing to instability of a transmission path between ATM switches or hardware inferiority, and to reset the soft PVC call, thereby securing stable data traffic. CONSTITUTION: Call processors transmit monitoring cells to other party(S41,S42). The other party confirms whether the monitoring cells are received(S43). If so, the call processors initialize a call cancel counter to re-drive the counter(S44), and if the monitoring cells are not received, the call processors increase a counter value by 1(S45). The call processors compare the increased counter value with a call cancel threshold value(S46). If the counter value reaches the call cancel threshold value, the call processors recognize a data traffic state as a failed state. If the call processors recognize that data traffic has a failure(S47), the call processors cancel a preset soft PVC call to reset the soft PVC call(S49). A call cancel and reset request message is transmitted to one of the call processors, so that the call processor can cancel and reset the soft PVC call(S48,S49).

Description

Method for Soft PVC Service in Exchange System {Method for Soft PVC Service in Exchange System}

The present invention relates to a soft dedicated virtual connection (PVC) service method in an ATM (Asynchronous Transfer Mode) exchange system. In particular, when there is no data traffic in a state where a call is set, the service is released after the call is released and reset. Relates to ways to improve the reliability.

In general, ATM switching systems have various types of connections. The connection provided by the ATM switching system includes a connection by a signaling procedure and a connection by a management procedure.

The connection by the signaling procedure is a switched virtual connection (SVC), and the connection by the management procedure is a dedicated virtual connection (Permanent Virtual Connection (PVC)), a form of a mixture of the SVC and PVC Is soft PVC.

With reference to Figure 1 attached to the soft PVC implementation method.

Referring to FIG. 1, a UNI (User to Network Interface) section between an originating subscriber 11, an originating exchange 12, and a destination subscriber 15 and the destination exchange 14 may correspond to a corresponding originating exchange 12 and a destination exchange ( 14) When the operator registers the PVC information in the Operation And Management (OAM), the PVC is formed, and the NNI (Network to Network Interface) between the originating exchange 12, the relay exchange 13, and the destination exchange 14 is formed. SVC is formed through Private Network to Network Interface (PNNI) or Broadband ISDN User's Part (BISUP) signaling.

Meanwhile, in the case of the soft PVC, when the SVC is released due to a failure in the NNI section, a series of operations are required for resetting, and a process flow thereof is performed as shown in FIG. 2.

Referring to FIG. 2, when a failure is detected (S21), the relay switch 13 sends a call release message, which is a message requesting the release of a soft PVC resource currently allocated to the originating exchange 12 and the destination exchange 14. (S22, S23), the allocated soft PVC resource is released (S24).

The incoming exchange 14 receiving the call release message releases the allocated soft PVC resource (S25), and the corresponding outgoing exchange 12 assigns a new soft PVC assignment to the corresponding relay exchange 13 'if there is a bypass path. The call setup request is sent (S26), and if there is no bypass path, the call setup request is sent to the existing relay exchange.

The relay switch 13 ', having received the call setup request, allocates soft PVC resources and makes a call setup request to the destination exchange (S27, S28).

The incoming exchange 14 receiving the call establishment request allocates a new soft PVC through resource reset and performs continuous communication through this (S29).

As described above, in the conventional soft PVC, when the call set to the failure of the NNI interval is released, the released call is automatically reset without the operator's monitoring and resetting request.

However, in this method, when the established call is normally maintained and only the data flow is not performed, that is, when the data flow is not progressed due to the interworking interface problem, switching problem, or hardware problem of the exchange, the call is not reset. There was a problem of not guaranteeing the traffic.

The present invention is to solve the problems as described above, the purpose is to monitor the data traffic through a predetermined soft PVC call in real time in the soft PVC system switching system does not make the data traffic in the state is not released call In this case, the call is released and reset to ensure data traffic.

1 is a block diagram of a conventional soft PVC type exchange system.

FIG. 2 is a process flow diagram in accordance with FIG. 1 in accordance with soft PVC call resetting.

3 is a configuration block diagram of a soft PVC type exchange system according to the present invention.

4 is a flowchart for explaining the soft PVC service operation in FIG.

Explanation of symbols on the main parts of the drawings

11: outgoing subscriber 12120: outgoing exchange

13,130: relay exchange 14,140: incoming exchange

15: incoming subscriber 121141: soft PVC function

122,142: supervisor cell generation unit 123,133,143: call processing unit

Soft PVC service method in the exchange system of the present invention for achieving the above object, driving call release counter by generating a monitoring cell between the source exchange and the destination exchange that provides data service through a predetermined soft PVC call Periodically transmitting to the other party along with; Recognizing a failure of data traffic according to a count value of a call release counter when the supervisory cell is not received at the counterpart; And releasing and resetting the predetermined soft PVC call at the originating exchange recognizing the failure.

Preferably, the step of recognizing the failure of the data traffic comprises the steps of checking the reception of the monitoring cell at a predetermined period at the counterpart; Initializing a driving call release counter when the supervisory cell is received, increasing the count value when the supervisory cell is not received, and comparing the call release threshold with the call release threshold; And recognizing a failure of data traffic when the count value is equal to a call release threshold.

Furthermore, when the destination exchange recognizes a failure of data traffic, releasing a call resource and transmitting a call release and reset request message to an originating exchange; And releasing and resetting a predetermined soft PVC call in the originating exchange receiving the call release and resetting request message.

More preferably, the soft PVC call resetting of the originating exchange is characterized in that it is made through the bypass route if there is a bypass route to the destination exchange.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the exchange system according to the present invention includes an originating exchanger 120, a terminating exchanger 140, and a call processing unit 133, and receives a call of the originating exchanger 120. It is composed of a relay exchange 130 to relay to.

The originating exchanger 120 and the terminating exchanger 140 are composed of a soft PVC function unit 121 and 141, a monitoring cell generating unit 122 and 142, and a call processing unit 123 and 143. The soft PVC function unit 121 and 141 is an operation management system ( When a soft PVC call setup request is received from the same (not shown in the figure), the call processor 123, 143 requests call setup.

Surveillance cell generation units 122 and 142 periodically generate a surveillance cell for monitoring the data traffic state through the set soft PVC call.

The call processing unit 123, 143 forms a PVC in the UNI section between the calling party 11 or the called party 15 when there is a call setup request from the soft PVC function unit 121, 141, and the call of the relay exchange 130. In cooperation with the processor 133, the SVC is formed through signaling in the NNI period.

When the soft PVC call is set, the call processing unit 123 of the originating exchange 120 transmits the information indicating that the set call is the soft PVC call to the call processing unit 133 or 143 of the relay exchange 130 and the destination exchange 140 on the NNI. Start data traffic monitoring in the NNI interval.

Data traffic monitoring is performed after the soft PVC call is established on the NNI traffic processing port of each exchange, and is performed through the monitoring cells generated by the monitoring cell generators 122 and 142 between the sections designated in the NNI traffic processing port.

That is, after the soft PVC call is set up, the call processing unit 123 of the originating exchange 120 exchanges the supervisory cell generated by the supervisory cell generator 122 through the call processor 133 of the relay exchange 130. It is periodically sent to the call processing unit 143, and checks whether or not to receive the monitoring cell transmitted by the call processing unit 143 of the destination exchange 140 to monitor the data traffic failure.

Similarly, the call processor 143 of the destination exchange 140 transfers the watch cell generated by the watch cell generator 142 in the exchange through the call processor 133 of the relay exchange 130 to the call processor of the originating exchange 120. It periodically transmits to 123 and checks whether or not the monitoring cell transmitted by the call processing unit 123 of the originating exchange 120 is monitored to monitor for data traffic failure.

The call processing unit 123, 143 of the originating exchange 120 and the destination exchange 140 driving the call release counter together with the supervisory cell transmission recognizes a failure of data traffic if the supervisory cell transmitted by the other party is not received within a predetermined time. do.

The call processing unit 123 of the originating exchange 120 recognizing the data traffic failure ensures data traffic by releasing and resetting a predetermined soft PVC call. However, when the call processing unit 143 of the destination exchange 140 detects a data traffic failure, it releases the allocated call resources and transmits a call release and reset request message to the originating exchange 120 to release and reset the call. In the release reason field of the call release message, a value for requesting a path change may be set to avoid a path in which a failure occurs.

In the case of resetting after clearing the preset soft PVC call in the outgoing exchanger 120, if there is a bypass path to the destination exchanger 140, the destination exchanger 140 is connected through a call processing unit (not shown) of the corresponding relay exchange. Require soft call setup to reset soft PVC call.

On the other hand, the monitoring cell is preferably generated when there is no data traffic of the user in order not to affect the data traffic of the user.

In addition, the monitoring cell generation and transmission function may utilize the continuity check (CC) function of the OAM function to monitor data traffic by activating the corresponding function at the same time as the connection setting.

In addition, the limit of the watch cell reception time, that is, the call release threshold, is about 3.5 seconds in the OAM function, but the fluidly larger value is set to the corresponding threshold. It can increase the reliability of the system.

The soft PVC service operation through monitoring of the data traffic state in the switching system will be described in detail with reference to FIG. 4.

After the soft PVC call is set up, the call processing units 123 and 143 of the originating exchange 120 and the terminating exchange 140 exchange the watch cells generated periodically by the supervisor cell generation units 122 and 142 in the corresponding exchange with the call release counter. Transmit (S41, S42).

If the supervisor cell is received (S43), when the supervisor cell is received, the driven call release counter is initialized and then restarted (S44, S42), and the supervisory cell is not received. The corresponding count value is increased to '1' (S45).

Then, the increased count value is compared with the call release threshold value (S46). If the count value does not reach the call release threshold value, the reception cell is again checked (S43). If the count value reaches the threshold value, the data traffic is reached. Recognize the condition as a faulty state.

When the call processing unit of the originating exchange 120 recognizes the data traffic failure (S47), the call processing unit 123 releases the preset soft PVC call and resets the soft PVC call through the bypass path when there is a bypass path. (S49), when the corresponding failure is recognized by the call processing unit 143 of the incoming exchange 140, a call release and resetting request message according to the occurrence of the failure is transmitted to the call processing unit 123 of the originating exchange 120, and the preset failure is set. Release the soft PVC arc and let it reset (S48, S49).

In addition, the embodiment according to the present invention is not limited to the above description, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention monitors the data traffic state through the soft PVC call using the monitoring cell in the soft PVC service system, which is an ATM service. In the event of a failure, the preset soft PVC call is released and then reset, thereby ensuring stable data traffic and providing high quality soft PVC service.

Claims (4)

Generating a monitoring cell between an originating exchange and a destination exchange providing data service through a predetermined soft PVC call and periodically transmitting the call cell to a counterpart with a call release counter; Recognizing a failure of data traffic according to a count value of a call release counter when the supervisory cell is not received at the counterpart; And a process of releasing and resetting a predetermined soft PVC call in the originating exchange that recognizes the failure. The method of claim 1, Recognizing the failure of the data traffic, the counterpart checks whether or not to receive the monitoring cell at a predetermined period; Initializing a driving call release counter when the supervisory cell is received, increasing the count value when the supervisory cell is not received, and comparing the call release threshold with the call release threshold; And recognizing a failure of data traffic when the count value is equal to a call release threshold. The method of claim 1, Releasing a call resource and sending a call release and reset request message to an originating exchange when the terminating exchange recognizes a failure of data traffic; And releasing and resetting a predetermined soft PVC call in the originating exchange receiving the call release and reset request message. The method according to claim 1 or 3, The soft PVC call resetting of the originating exchange is performed through the bypass route when there is a bypass route leading to the destination exchange.