KR100748092B1 - Multiple Protection Switching Control Method in Next Generation - Synchronous Digital Hierarchy Switching System - Google Patents

Abstract

The present invention relates to a multiple protection switching control method in a Next Generation Synchronous Digital Hierarchy (NG-SDH) switching system, and includes a SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) signal failure and LCAS ( Link Capacity Adjustment Scheme) detecting at the same time periodically detecting the occurrence of a failure; And a first switching step of performing SONET / SDH protection switching when the occurrence of the SOAS / SDH signal failure is detected by checking the SONET / SDH signal failure occurrence detection result when the occurrence of the LCAS failure is detected in the detection step. do.

NG-SDH, SONET / SDH, EOS, Failure, Protection Transfer, Recovery

Description

Multiple Protection Switching Control Method in Next Generation-Synchronous Digital Hierarchy Switching System

1 is a block diagram showing a next generation synchronous digital hierarchy (NG-SDH) switching system to which the present invention is applied.

FIG. 2 is a diagram illustrating a structure of inter-layer input / output signal processing in the EOS device of the next generation synchronous digital hierarchy (NG-SDH) switching system of FIG. 1.

3 is a view showing a protection switching process in the network configuration of the next-generation synchronous digital hierarchy (NG-SDH) switching system to which the present invention is applied.

4 is a flowchart of a control method of multiple protection switching in a next generation synchronous digital hierarchy (NG-SDH) switching system according to a preferred embodiment of the present invention.

 Explanation of symbols on the main parts of the drawings

102: operating signal input and output terminal 104: preliminary signal input and output terminal

110: EOS device 112: SONET / SDH signal matching layer

114: EOS adaptation layer unit 116: Ethernet frame transfer unit

120: packet switching device 130: central control processor device

The present invention relates to a Next Generation Synchronous Digital Hierarchy (NG-SDH) switching system. In particular, the present invention collects and monitors a fault condition of an operating signal and a preliminary signal input from an EOS device of an NG-SDH switching system. The present invention relates to a multiple protection switching control method in an NG-SDH switching system which selects a good signal and recovers service when a failure occurs.

In general, Protection Switching of Synchronous Optical Network / Synchronous Digital Hierarchy (SONET / SDH) is a failure of the operation signal and the reserve signal in the SONET / SDH signal matching interface that processes the synchronization signal. Collect the state. At this time, if a signal is disturbed, the fault is recovered by selecting a good signal from two signals (operation signal and preliminary signal).

In addition, the Link Capacity Adjustment Scheme (LCAS) of Ethernet over SONET / SDH (EOS) devices enables automatic elimination of the fault paths resulting from virtual concatenation (VCAT), return function, and the ability to increase or decrease link capacity without errors. Has

The LCAS failover function is a link capacity adjustment of the member paths of the member paths in the virtual connection (VCAT) group of SONET / SDH in the EOS (Ethernet over SONET / SDH) adaptation layer which converts and processes the SONET / SDH signal and the Ethernet signal. Scheme) Monitor fault status. At this time, if a failure occurs in a specific member path, it is a recovery function that disables the member path and enables the service only with the remaining member paths in the group.

The SONET / SDH protection switching function and the LCAS failover function are controlled in an independent manner. Therefore, if the device fails, SONET / SDH protection switching is performed first, and although the result is successful, an instantaneous failure occurs in the EOS adaptation layer due to signal continuity and unnecessary LCAS failover is performed. Performing such a redundant recovery operation raises the load of the corresponding device, and causes a signal fluctuation due to unnecessary signal control, thereby reducing the quality of the service signal.

Next Generation Synchronous Digital Hierarchy (NG-SDH) switching systems are aimed at delivering a great deal of information, and must transmit the information quickly and accurately. In addition, it is important for the NG-SDH switching system to transmit and receive data between network components without failure. In such a NG-SDH switching system, a network failure recovery function is an important factor in evaluating the value of the system.

The present invention is to solve the above problems, the protection switching function of the synchronous optical network / synchronous digital hierarchy (SONET / SDH) in the next generation synchronous digital hierarchy (NG-SDH) switching system and the LCAS failure recovery function of the EOS device To provide multiple protection switching control method in NG-SDH switching system that provides multiple recovery functions for signal failure in NG-SDH switching system and improves the reliability of services by integrating and controlling them in conjunction with each other. There is this.

In the NG-SDH (Next Generation-Synchronous Digital Hierarchy: NG-SDH) switching system according to the present invention for achieving the above object, the control method of multiple protection switching, SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) A detection step of periodically detecting whether a signal failure and a link capacity adjustment scheme (LCAS) failure occur at the same time; and when the occurrence of the LCAS failure is detected in the detection step, by checking the detection result of the SONET / SDH signal failure occurrence And a first switching step of performing SONET / SDH protection switching when the SONET / SDH signal failure occurrence is detected.

In one embodiment of the present invention, the multiple protection switching control method of the present invention, after the detection step, when the SONET / SDH signal failure occurrence is detected in the detection step, performs a SONET / SDH protection switching The method may further include a second switching step, wherein the second switching step comprises: a first step of determining whether the SONET / SDH protection switching function is activated; A second step of performing the SONET / SDH protection switching when activated; Determining whether the SONET / SDH protection switchover is successful; And a fourth step of reporting the performance result to the operating system if the operation is successful. Furthermore, if the LCAS failure occurs according to a detection result of the LCAS failure, if it is deactivated in the first step or fails in the third step. It may further comprise the step of recovering.

In addition, in one embodiment of the present invention, in the multiple protection switching control method of the present invention, the first switching step is the occurrence of the SONET / SDH signal failure when the LCAS failure occurrence is detected in the detection step If not detected, the method may further include recovering the generated LCAS failure.

In addition, in one embodiment of the present invention, the multiple protection switching control method of the present invention, the first switching step, the fifth step of determining whether the SONET / SDH protection switching function is activated; A sixth step of performing the SONET / SDH protection switching when activated; A seventh step of determining whether the SONET / SDH protection switchover is successful; And an eighth step of reporting the performance result to the operating system if the operation is successful. In this case, the LCAS failure is determined according to the detection result of the LCAS failure occurrence if it is deactivated in the fifth step or fails in the seventh step. It may further comprise the step of recovering.

In addition, in one embodiment of the present invention, the multiple protection switching control method of the present invention, after the detection step, when the SONET / SDH signal failure and the occurrence of the LCAS failure is detected at the same time, the SONET / SDH The method may further include performing protection switching, wherein the protection switching may include: a ninth step of determining whether the SONET / SDH protection switching function is activated; A tenth step of performing the SONET / SDH protection switching when activated; An eleventh step of determining whether the SONET / SDH protection switchover is successful; And a twelfth step of reporting the performance result to the operating system if the operation is successful. Furthermore, if the LCAS failure is detected according to a detection result of the LCAS failure occurrence in the ninth step, or deactivated in the eleventh step. The method may further include recovering.

According to the present invention, the multiple protection switching control method of the EOS device in the NG-SDH switching system is a failure recovery function that was independently performed in each conventional layer in the NG-SDH switching system, which has recently emerged to integrate packet networks and circuit networks. It eliminates the problem of service signal fluctuation or fluctuation due to unnecessary and frequent device control and improves the performance of the control processor by performing multiple protection switching with one integrated interworking process. Ensuring connectivity and improving service reliability

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 1 is a diagram illustrating a Next Generation Synchronous Digital Hierarchy (NG-SDH) switching system for multiple protection switching control according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the next generation synchronous digital hierarchy (NG-SDH) switching system includes a plurality of Ethernet over SONET / SDH (EOS) devices 110, a packet switching device 120, a central control processor device 130, and It includes an operating system 140. Each EOS device 110 also includes a SONET / SDH signal matching layer 112, an EOS adaptation layer 114, and an Ethernet frame transfer unit 116, respectively.

The SONET / SDH signal matching layer unit 112 is an SONET / SDH Optical Carrier level (OC) -M / STM (operating signal I / O terminal 102 and two preliminary signal I / O terminals 104 which are two input / output signal terminals. Synchronous Transport Module level (N) signals are thought and history as virtual container level (VC) 3/4 signals.

The SONET / SDH signal matching layer unit 112 multiplexes the time slot-switched VC 3/4 signal, and frames and outputs a SONET / SDH OC-M / STM-N signal.

The EOS adaptation layer unit 114 extracts an Ethernet signal from the time slot-switched VC 3/4 signal in the ONET / SDH signal matching layer unit 112. In addition, the EOS adaptation layer 114 converts the extracted Ethernet signal into a fixed length packet or recombines a packet-switched fixed length packet to generate an Ethernet signal to map to a VC 3/4 signal and to perform a packet / time slot bridge function. Do this.

The Ethernet frame transfer unit 116 transfers the Ethernet frame converted into a packet of a fixed length by the EOS adaptation layer unit 114 to the packet switching device 120.

Meanwhile, the packet switching device 120 switches and outputs the Ethernet frame traffic converted into a packet of a fixed length transmitted from the Ethernet frame forwarding unit 116 of the EOS device 110.

The central control processor device 130 monitors and controls the EOS device 110 and the packet switching device 120.

The operating system 140 provisions, maintains, and manages a network consisting of an NG-SDH switching system and an NG-SDH switching system through a communication line 106 between devices.

Accordingly, for the signal recovery and service recovery in the event of a failure with respect to the signals input to the two input terminals 102 and 104, the failure status value of each device in the EOS device 110 is monitored at regular intervals by the monitoring control software, and the failure status value In accordance with the protection switching function and performs the function of notifying the operation system 140 of the result.

2 is a diagram illustrating an inter-layer input and output signal processing structure of the EOS device 110 in FIG. 1 according to an embodiment of the present invention.

As shown in FIG. 2, the diagram is an inter-layer signal propagation structure showing mutual conversion and signal propagation between SONET / SDH signals and Ethernet signals in the EOS device 110 of the NG-SDH switching system.

The SONET / SDH signal matching layer unit 112 is a SONET / SDH frame for an OC-M / STM-N signal input to two input / output signal terminals, an operation signal input / output terminal 102 and a preliminary signal input / output terminal 104. It consists of a SONET / SDH layer 113 which processes the physical phase, the regeneration section, the multiplexing step, and the VC-n pass step.

The EOS adaptation layer unit 114 is composed of an EOS adaptation layer 115 that performs a VCAT group, a generic frame procedure (GFP), and an LCAS function to convert the fixed packet signal.

The Ethernet frame forwarding unit 116 is composed of an Ethernet layer 117 having an Ethernet packet forwarding function for packet switching to a destination through Ethernet frame forwarding.

In the opposite case, the incoming Ethernet signal is transferred to the SONET / SDH signal matching layer 112 through the reverse process. In the NG-SDH switching system, the signal input and output when the network is configured to be transmitted from the origin to the desired destination integrity, the EOS device 110 performs the above functions for the connectivity of the signal for each layer.

Also, in the embodiment of the present invention, the SONET / SDH layer 113 performs a conventional SONET / SDH protection switching function in order to recover the service for a failure, and independently the LCLC failover function of the conventional LCAS in the EOS adaptation layer 115. This will each be done.

3 is a protection switching configuration in the network configuration of the NG-SDH switching system to which the present invention is applied.

As shown in FIG. 3, the SONET / SDH protection switching structure that can be configured as the NG-SDH switching system according to the present invention is a 1 + 1 line protection switching when configuring a point-to-point, and node 1 301 and a node. 2 302 is connected to the operation signal input and output terminal 305 and the preliminary signal input and output terminal 306 between the EOS device 303, which is a network component, the traffic of the packetized signal is transmitted to the packet switching device 304 in the node Through packet switching.

In the network configuration, a recovery function is performed for each signal layer. First, a 1 + 1 SONET / SDH protection switching function 307 between SONET / SDH signal matching layers is performed. 1 + 1 line protection switching is based on the concept of supporting two network connections for one independent slave signal. In this case, the transmitting unit bridges and transmits the same signal, and the receiving unit monitors two signals to select and receive the most appropriate signal. Secondly, LCAS failover (308) function between EOS adaptation layers is performed.

4 is a flowchart illustrating a method for controlling multiple protection switching in an NG-SDH switching system according to a preferred embodiment of the present invention.

As shown in FIG. 4, first, a failure state value generated in the SONET / SDH layer 113 from the SONET / SDH signal matching layer unit 112 is collected by a periodic timer (S401), and at the same time, an EOS adaptation layer. The LCAS failure state value generated in the EOS adaptation layer 115 is collected from the unit 114 by a periodic timer (S403). In other words, the present invention simultaneously detects whether a SONET / SDH signal failure occurs and whether an LCAS failure occurs.

First, whether the LCAS failure occurs is determined (S405), and if the LCAS failure does not occur, the LCAS failure detection step (S403) is performed again. At the same time, it is determined whether the SONET / SDH failure occurs (S407), and if the SONET / SDH signal failure does not occur, the SONET / SDH signal failure detection step (S401) is performed again. In this case, as shown in the figure, it is determined whether the SONET / SDH signal failure occurs even when the LCAS failure occurs first (S405) (S407).

If it is determined that the SONET / SDH signal failure has occurred (S407), it is determined whether the SONET / SDH protection switching function is provisioned and activated (S409). If it is determined that the SONET / SDH protection switching function is inactivated, the LCAS failure recovery function is performed according to whether the LCAS failure occurs (S411), and the operation system 140 is notified of the result of the LCAS failure recovery. (S417).

If it is determined in step S409 that the protection switching function is activated, the SONET / SDH protection switching is performed (S413), and it is determined whether the SONET / SDH protection switching is performed successfully (S415). If it is determined that the SONET / SDH protection switching is performed successfully, the result is notified to the operation system 140 and terminated (S417). If it is determined that the performed SONET / SDH protection switching has failed due to hardware and software problems, the LCAS failure recovery function is performed according to whether the LCAS failure occurs (S411).

As described above, when the occurrence of the LCAS failure is detected and the determination of the occurrence of the LCAS failure occurs, it is determined whether the SONET / SDH signal failure has occurred again. If it is determined that SONET / SDH signal failure occurs even when the LCAS failure occurs, the SONET / SDH protection switching function is activated depending on whether the SONET / SDH protection switching function is activated because LACS failure and SONET / SDH signal failure occur at the same time. And notify the operating system 140 of the result.

As described above, step S401 and step S403 are separately illustrated in FIG. 4, but in the EOS device of the NG-SDH switching system according to the present invention, whether SONET / SDH signal failure occurs and LCAS failure occurs in one process. Are simultaneously detected and interoperate to perform SONET / SDH protection switching and LCAS recovery.

Accordingly, in the conventional EOS device, by applying the multiple protection switching control method integrating and interworking the SONET / SDH protection switching function and the LCAS failure recovery function by referring to the presence or absence of the above function and the result information of the operation, Failover can be performed more efficiently.

In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications and equivalents without departing from the gist of the present invention attached to the claims. Other implementations may be possible.

Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

According to the present invention, the multiple protection switching control method of the EOS device in the NG-SDH switching system is a failure recovery function that was independently performed in each conventional layer in the NG-SDH switching system, which has recently emerged to integrate packet networks and circuit networks. It eliminates the problem of service signal fluctuation or fluctuation due to unnecessary and frequent device control and improves the performance of the control processor by performing multiple protection switching with one integrated interworking process. Ensuring connectivity and improving service reliability

Claims (10)

In the multiple protection switching control method of the Next Generation-Synchronous Digital Hierarchy (NG-SDH) switching system, A detection step of periodically detecting whether a SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy) signal failure and a Link Capacity Adjustment Scheme (LCAS) failure occur at the same time; And A first switching step of performing SONET / SDH protection switching when the occurrence of the LCAS failure is detected in the detecting step, when the SONET / SDH signal failure occurrence detection is detected and the SONET / SDH signal failure occurrence is detected; Multiple protection switching control method in the NG-SDH switching system comprising a. The method of claim 1, wherein after the detecting step, And a second switching step of performing SONET / SDH protection switching when the SONET / SDH signal failure occurrence is detected in the detection step. The method of claim 2, wherein the second transfer step, A first step of determining whether the SONET / SDH protection switching function is activated; A second step of performing the SONET / SDH protection switching when activated; Determining whether the SONET / SDH protection switchover is successful; A fourth step of reporting the performance result to an operation system if the operation is successful; Multiple protection switching control method in the NG-SDH switching system comprising a. The method of claim 3, If the deactivation in the first step or the failure in the third step, the LCAS failure recovery step according to the LCAS failure detection further comprising the multiple protection switching in the NG-SDH switching system Control method. The method of claim 1, wherein the first transfer step, When the occurrence of the LCAS failure is detected in the detecting step, if the occurrence of the SONET / SDH signal failure is not detected further comprising the step of recovering the generated LCAS failure multiplexed in the NG-SDH switching system Protective transfer control method. The method of claim 1, wherein the first transfer step, A fifth step of determining whether the SONET / SDH protection switching function is activated; A sixth step of performing the SONET / SDH protection switching when activated; A seventh step of determining whether the SONET / SDH protection switchover is successful; An eighth step of reporting the result of execution to the operating system if it is successful; Multiple protection switching control method in the NG-SDH switching system comprising a. The method of claim 6, If the deactivation in the fifth step or the failure in the seventh step, the multiple protection switching in the NG-SDH switching system further comprising the step of recovering the LCAS failure in accordance with the LCAS failure occurrence detection result Control method. The method of claim 1, wherein after the detecting step, And performing the SONET / SDH protection switching when the SONET / SDH signal failure and the occurrence of the LCAS failure are detected at the same time. The method of claim 8, wherein performing the protection transfer, A ninth step of determining whether the SONET / SDH protection switching function is activated; A tenth step of performing the SONET / SDH protection switching when activated; An eleventh step of determining whether the SONET / SDH protection switchover is successful; A twelfth step of reporting the performance result to an operating system if the result is successful; Multiple protection switching control method in the NG-SDH switching system comprising a. The method of claim 9, Multiple protection switching control in the NG-SDH switching system, characterized in that further comprising the step of recovering the LCAS failure in accordance with the LCAS failure occurrence detection result if the deactivation in the ninth step or the failure in the eleventh step. Way.

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