KR100216578B1 - Method for controlling starting/restarting of message transfer part level 3 and signal aal in distributed atm exchanger - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Message transfer level 3 and signaling ATM adaptation layer start / restart control method in a decentralized ATM switch.

2. The technical problem to be solved by the invention

In order to flexibly respond to changes in system resource status, to secure signal transmission paths for signal message transmission and signal network control.

3. Summary of Solution to Invention

Message transfer and signaling through level 3 and signaling control distributed to multiple processes during initial startup of the system, and through startup control procedures to collect and distribute process numbers of functional blocks of the ATM adaptation layer and to restart specific blocks during operation. It secures the signal transmission path for network control and reduces the signal in the system according to the startup by using one block in the message delivery unit as the startup control block.

4. Important uses of the invention

Used to implement the functionality of MTP-3 and SAAL in ATM switches.

Description

Message transfer part level 3 and signaling ATM adaptive layer start / restart control method in distributed ATM of distributed structure

The present invention relates to a transmitter level 3 and signaling ATM adaptation layer startup / restart control method in an ATM switch.

Each foreign exchange that realized the NNI signaling method implemented the functions of the message delivery unit and the signaling ATM adaptation layer according to their structure. Accordingly, in order to realize the NNI signaling method in the ATM switching system, the overall structure of the system and the MTP-3 and There is a need for implementation of a startup and restart method suitable for the distributed architecture of SAAL.

In an ATM switching system where the blocks serving the functions of MTP-3 and SAAL are distributed, each of the blocks interlocked with each other is used to transmit a message to an unstarted process if it does not store the location or number of the process for message transmission. This results in the loss of user messages, and the individual startup procedure of several blocks interworking with each other can seriously affect the reliability and performance of the system.

Accordingly, the present invention provides a message delivery unit level 3 and a signal ATM adaptation layer distributed to various processors during initial startup of a system in order to flexibly cope with system resource change and secure a signal transmission path for signaling message transmission and signal network control. Its purpose is to provide a start-up control procedure for collecting and distributing process numbers of functional blocks and a control procedure for restarting a specific block during operation.

1 is a block diagram of an ATM SVC switch message transfer unit and a signal AAL block to which the present invention is applied;

2 is a data structure diagram for start / restart control;

3A and 3B are flow charts of process number collection and distribution at system initial startup;

4 is a process number collection and distribution flow diagram upon block restart.

In order to achieve the above object, the present invention, in the start and restart control method of the MTP-3 and SAAL block applied to the ATM switching system having a distributed structure, for starting and restart control of the signal link management block of the MTP-3 As a control block, it collects process numbers of blocks that are distributed and started by the processor of each subsystem when the system starts up, and collects process numbers when restarting one block during operation. It is characterized by including the two steps to enable the normal operation by telling the required process number.

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

1 is a MTP-3 and SAAL structure diagram of an ATM switching system to which the present invention is applied.

The ATM switch is composed of one Central Switching Subsystem (hereinafter referred to as ACS) and a plurality of Access Switching Subsystems (hereinafter referred to as ALS). The ACS has an Operating and Maintenance Processor (OMP) (1), which is a processor equipped with system-wide control functions such as operation maintenance, network management, and routing control, and ALS is a call related to ALS. It has a call and connection control processor (hereinafter referred to as CCCP) 2 which is a processor in charge of control signal processing, operation, maintenance and the like. CCCP (2) is performed by mounting the subscriber-related block or relay line-related blocks in accordance with the characteristics of the ALS. MTP-3 and SAAL functions to which the present invention is applied are distributedly implemented in OMP (1) of ACS and CCCP (2) of ALS having relay line functions. The Message Transfer Part Level 3: MTP-3b function is a signaling link management block (SLM) for controlling the activation of signaling links. Signaling traffic management block (Signal Traffic Management: STM) (4) responsible for changing the routing of the signal traffic in accordance with the (4), Signaling message processing block (signaling message handling) responsible for the actual signal message processing of the user unit and SAAL (Hereinafter referred to as SMH) 5.

The functions of the Signaling ATM Adaptation Layer (SAAL) and the Broadband Signaling Interface (BSI) 7 which control the message flow of the signal channel constituting each signal link and A trunk line signal coordination block (hereinafter referred to as TSC) 6 that is responsible for initial alignment and verification upon signal link activation. In the ATM switching system structure, the SMH, BSI, which requires real-time processing in connection with the actual message transmission, and the TSC, which is related only to the initial alignment of the signal link assigned in the ALS, are redundantly implemented in each CCCP (2) and connected to each power station SLM and STM, which require integrated management of components, are centrally implemented in the OMP (1) of ACS. Each block has the function of transmitting and receiving control signals for transmission of signaling messages and management of the signaling network during operation, so each block must have a location or number of a process to communicate with it.

SLM communicates with TSC of each CCCP to control activation of signal link, SMH of each CCCP for sending and receiving signal link test messages, and STM for status control of signal network elements. It communicates with the SMH of each CCCP for transmission and reception of signaling network management messages, and the BSI of each CCCP for controlling the number of signaling messages when switching signal traffic. SMH communicates with SLM, STM and BSI of each CCCP to transmit and receive signaling network management messages.

The TSC communicates with the STM and the SMH in the same CCCP to control the activation of the signal link. Each block performs the initial procedure to find out the process number of the other block associated with it at startup. When interworking with n blocks in a block, 2n message transmission and reception occurs, and the startup sequence control between blocks becomes complicated. Accordingly, the present invention provides a start and restart control method using the signal link management block in the message transfer unit as the main start control block.

2 is a data structure diagram for a process number to be stored and transmitted for startup and restart of each block in the SLM.

SLM collects and stores the process numbers of all blocks started for the start and restart of each block, and sends them to the required blocks. The STMid 11 is a variable for storing the process number of the STM, and the SMHtbl 8 is an array of the number of ALSs that can be accommodated in the system in order to store the process numbers of SMH blocks in startup operation for each ALS_NO. The TSCtbl (9) and BSItbl (10) arrays also store the process numbers of TSC and BSI for each ALS.

3A and 3B show the control flow performed at startup of the entire system or OMP in the SLM.

After startup of the SLM (12), an initial message collection procedure with MTP-3 blocks is first performed. In the OMP, a signal for requesting the process number of the STM is transmitted (13), and a signal for requesting the SMH process is transmitted to the CCCP of each ALS including the relay line (14) among the ALS in the system configuration (15). . After transmitting all signals, it initializes initialization timer 1 (17) and waits for receiving process number from STM and SMH (18). When the STM start signal is received (20), the transmission process of the signal is stored in the STM id (21). When the start signal is received from the SMH (22), the ALS number is obtained using the transmission process number of the signal (23), and the transmission process number is stored in the corresponding ALS number of the array SMHtbl for storing the SMH process number (24). The L_onoff flag is indicated to indicate that at least one has been started (25). When the initialization timer 1 is terminated (26) check the start state of the STM and SMH (27) If the STM number and at least one SMHid is stored, it is possible to perform the function of the MTP-3, so perform the following procedure (29) Rerun (28) and wait.

If the SMH process number of the ALS is not 0 (31) after the initial startup of the MTP-3 blocks is completed (30), the SLM and STM process numbers are returned. (32), the SLM process number is transmitted to the TSC for interworking with the SAAL (33), the SLM, STM, and SMH process numbers of the same ALS are transmitted to the CCCP for the BSI (34), and the timer T2 Drive (35) and wait for a response from the TSC and the BSI (36). When a response is received from the TSC (38), an ALS number is obtained using the transmission process number of the signal (39), and the transmission process number is stored in the corresponding ALS number of the array TSCtbl for storing the TSC process number (40). When a response is received from the BSI (41), an ALS number is obtained using the transmission process number of the signal (42), and the transmission process number is stored in the corresponding ALS number of the array BSItbl for storing the BSI process number (43). If initialization timer 2 expires (44) informs the STM of the BISF process array BSItbl (45), and sends BSItbl to SMH that is started from SMHtbl (47) (48) all initial startup procedures are completed (49). .

4 is a flowchart illustrating a restart of one block during operation.

When the start signal is received from the SMH (50), the ALS number is obtained from the transmission process number of the signal (51), and the transmission process number is stored in the field corresponding to the ALS number of the SMHtbl (52). The process number is sent (53). In addition, a signal for restarting is transmitted to the TSC of the CCCP (54), and an MTP-3 related block id including the SMH changed to the BSI is transmitted (55). When the restart signal is received from the TSC (56), the ALS number is obtained from the transmission process number of the signal (57), and the transmission process number is stored in the field corresponding to the ALS number of the TSCtbl only when the SMH of the ALS is activated (58). In step 59, the SLM process number is transmitted in response.

When the restart signal is received from the BSI (60), the ALS number is obtained from the transmission process number of the signal (61) .After confirming the startup of the SMH of the corresponding ALS, the transmission process number is stored in the field corresponding to the ALS number of the BSItbl (62). In response, the SMH process number of the same ALS as the STM is transmitted (63).

The TSC is only involved in the activation of the signal channel set as a path in the ALS, and since the BSI transmits a signal message only to the SMH in the same CCCP, the SMC in the same CCCP is not started so that the normal operation cannot be performed.

When receiving the MTPid reception response from the TSC (64), the transmission process number is stored in the corresponding ALS column (65, 66). When receiving the MTPid reception response from the BSI (67), the transmission process number is stored in the corresponding ALS column (68) (69), the BSItbl changed to the STM is transmitted (70), and the SMH of each CCCP in operation (71) (72) The BSI tbl is transmitted (73).

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

Accordingly, the present invention operating as described above prevents the loss of messages and the generation of unnecessary messages through the control of the blocks that can be operated at system startup in realizing the functions of MTP-3 and SAAL in a distributed ATM exchanger. Control of restarted blocks during operation enables flexible operation as system capacity increases. Since only the initialization signal is transmitted / received with the control block at the start of each block, the amount of initialization messages according to the startup between blocks is significantly reduced, thus enabling a smooth start of the system.

Claims (2)

A message transfer unit and a signal ATM adaptive layer start / restart control method in a distributed ATM switch, The signal link management block of MTP-3 is the main control block for startup and restart control, and when the system starts up, it collects the process numbers of the blocks distributed to the processors of each subsystem and informs the process numbers to be linked. Stage 1, A message transfer unit and a signal ATM adaptation layer in an ATM switch having a distributed structure, comprising a second step of collecting a process number and informing a necessary process number when restarting one block during operation to enable normal operation. Start / restart control method. The method of claim 1, The first step or the second step, Message delivery and signaling ATM adaptation layer startup / restart in a distributed ATM switcher, characterized in that it controls the startup of a signaling ATM adaptation layer related block based on the startup state of the signaling message processing block (SMH) of the message delivery unit. Control method.