KR100231702B1 - A sequential path control method in the atm switching system with multi-stage switch - Google Patents

Abstract

The present invention relates to a sequential path control method for an internal link path of a switch in an ATM switching system having a switch having a multi-stage structure. Specifically, a call / connection processing block of an originating call / connection control processor (CCCP) is a calling subscriber. Call / Connection Setup When the SETUP message is received, it calls the Switch Link Resource Management Block (SLRHF) to select and reserve the access switch (ASW) internal link, and then reaches the number translation control block (NTCF) of the OMP. The number translation control path (NTCF) of the operation / maintenance processor (OMP) translates the called number and calls the switch link path control block (SLPCF) to make a call with the calling subscriber. Establishing a switch link path between the access local system (ALS), and the call / connection processing block at the originating side is assigned to the internal link of the reserved outgoing access switch (ASW). Releasing the station, updating the internal link band management table of the calling party access switch (ASW), and sending a called party routing message to the call / connection processing block of the called party / connection control processor (CCCP); The call / connection processing block of the incoming call / connection control processor (CCCP) calls the switch link resource management block (SLRHF) to perform routing of the called party to receive the connection request from the calling subscriber to the called subscriber. It is characterized by setting an optimal path and enabling efficient network resource management.

Description

A sequential path control method in the ATM switching system with multi-stage switch

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sequential path control method for an internal link path of a switch in an ATM (Asynchronous Transfer Mode) switching system having a multi-stage switch. In particular, a software switching switch structure or a multi-stage switch A method for controlling outgoing and called party paths for establishing a path from an originating subscriber to a called party using a sequential path control method among switch internal link routing methods of a distributed high-capacity ATM switching system having a multi-stage switch structure will be.

A large-scale ATM switching system is needed as a base equipment to provide broadband comprehensive telecommunication service, and in a large-scale ATM switching system where high-speed data processing and exchange is performed, a limited resource is shared by many users, thus providing an efficient network. Resource management and optimal routing are essential. In particular, the implementation of such a function in an ATM switching system having a distributed structure is an important factor in determining the performance and efficiency of the system.

In the conventional exchange system, the unit value as shown in FIG. 6A was used as the unit switch of each subsystem. Therefore, since there were no resources to manage in the subsystems of the switching system, only the switch link resources connecting each subsystem were managed and the internal paths of the switches were set with reference to their management states.

FIG. 6B illustrates a method of configuring a switch module using a unit switch having any size shown in FIG. 6A.

6A shows a unit switch composed of one stage having N input ports and N output ports. FIG. 6B illustrates the switch module having the size of the switch expanded to MxM (M >> N) using the unit switch of FIG. 6A.

The NxN unit switches mentioned in FIG. 6A are arranged in K (K = M / N) columns vertically, and shuffled to connect the input and output links of each unit switch to be constantly mixed. This constitutes a switch module of MxM.

In this structure, although the unit switch itself has a non-software blocking characteristic, the switch module is changed to a blocking switch in which software blocking occurs in the shuffled link.

FIG. 7 illustrates a configuration of an ATM switching system having a switch network configured by using a switch module defined in FIGS. 6A and 6B and configured in this way.

The distributed ATM switching system having the structure of FIG. 7 is a subsystem, which is composed of an Access Local Subsystem (ALS) and an Access Central Subsystem (ACS).

In the ATM switch area of the access local system (ALS) and the central local system (ACS), a switch module shown in FIG. 6B is mounted, which is called an access switch (ASW) and a central switch (CSW), respectively.

In addition, each subsystem has processors that handle the main processing functions of the ATM switching system. Processors located in the access local system (ALS) are called call connection control processors (CCCPs) and central local systems (ACSs). The processor located at is called Operation Maintenance Processor (OMP).

Such a switching system can mount up to x access local systems (ALS), thus up to j central switches (CSW) can be mounted in a central local system (ACS).

As the switch in each subsystem has a multi-stage structure as shown in FIG. 6B as described above, resource management for switch module internal links existing in each subsystem as well as switch link resources for connecting each subsystem. In order to establish the internal link path of the switch, data to be referred to need to be added, and a path setting method for establishing an optimal path and a data management method for the same are needed.

Accordingly, an object of the present invention is to provide an efficient sequential routing control method that can be commonly used in all kinds of calls / connections in an ATM switching system having a switch having a multi-stage structure.

1 is an overall configuration diagram of a sequential path control method according to the present invention.

2 is a flow chart of an originating processing function in a switch link resource management block (SLRHF) located in an outgoing call / connection control processor (CCCP) in step 2 of performing a sequential path control method according to the present invention.

3 is a flow chart of an incoming processing function in a switch link resource management block (SLRHF) located in a called party call / connection control processor (CCCP) in step 4 of performing a sequential path control method according to the present invention.

4 is a flowchart of an incoming processing function performed by a switch link resource management block (SLRHF) located in a called party call / connection control processor (CCCP) in step 5 of performing a sequential path control method according to the present invention.

5 is a flow chart of an originating processing function performed in a switch link resource management block (SLRHF) located in an incoming call / connection control processor (CCCP) in step 7 of performing a sequential path control method according to the present invention.

Figure 6a is a block diagram of a conventional unit switch.

Figure 6b is a block diagram of a switch module having a multi-stage structure consisting of a unit switch of Figure 6a.

7 is a block diagram of an ATM switching system using a multi-stage switch module to which the present invention is applied.

8 is a block diagram of data blocks for path control and switch link resource management according to the present invention;

* Description of the symbols for the main parts of the drawings *

100: Call / Connection Control Processor (CCCP)

110: access switch internal link band management table

120: configuration management table for access local system

130: switch link resource management block (SLRHF)

200: Operation / maintenance processor (OMP)

210: central switch internal link band management table

220: switch link band management table between the access local system (ALS) and the central local system (ACS)

230: Configuration management table of the central local system (ACS) connected to the access local system (ALS)

240: switch link path control block (SLPCF)

In order to achieve the above object, a sequential path control method in an ATM switching system having a switch having a multi-stage structure according to the present invention is a call / connection processing block of an originating call / connection control processor (CCCP). Receiving a message, calling a switch link resource management block (SLRHF) that manages an originating switch link resource;

The called switch link resource management block (SLRHF) selects and reserves the access switch (ASW) internal link, informs the originating call / connection processing block, and the number translation control block (NTCF) of the operation / maintenance processor (OMP). Requesting translation of the called number and establishment of a route to the mobile station;

A third translation control block (NTCF) of the operation / preservation processor (OMP) translates the called number to find the number of the local system to which the called party belongs and to call the switch link path control block (SLPCF) for switch path control. Steps;

The switch link path control block (SLPCF) establishes a switch link path between the originating subscriber and the terminating access local system (ALS), and translates and routes the number to the call / connection processing block of the originating call / connection control processor (CCCP). A fourth step of notifying that the service is set up;

The call / connection processing block of the calling party notified of the number translation and path setting completion releases the band of the internal link of the reserved outgoing access switch (ASW), and sets the internal link band management table of the outgoing access switch (ASW). Updating, and sending a called party path setting internal SETUP message to a call / connection processing block of a called party call / connection control processor (CCCP);

A sixth step of calling, by the call / connection processing block of the incoming call / connection control processor (CCCP), which has received the internal SETUP message, to call the switch link resource management block (SLRHF) to set the path of the called party;

The called party's switch link resource management block (SLRHF) establishes a path between the calling party and the called party via the called access local system (ALS), and the called party routing is completed in the calling / connection processing block. And performing a seventh step of notifying that the operation has been completed, thereby sequentially controlling the path setting between the calling subscriber and the called subscriber.

For this reason, the present invention provides a point-to-point and point-to-multipoint switched virtual connection (SVC) connection by a point-to-point and point-to-multipoint signal processed in an ATM switching system, and a point-to-point and point-to-multipoint command by a system operator. It has a feature that can be commonly used in all kinds of call / connection such as PSTN, PSDN, FR call / connection as well as point-to-point virtual virtual connection (PVC) call / connection.

Hereinafter, a sequential path control method in an ATM switching system having a switch having a multi-stage structure according to the present invention will be described with reference to the accompanying drawings.

First, in order to optimally apply the sequential path control method according to the present invention, data related to the internal path setting of the switch need to be optimally managed. Therefore, if an optimal data structure is proposed for the sequential path control method according to the present invention, FIG. 8 shows the positions of control blocks and data for path control and switch link resource management. It is located separately in each processor in the form of a table. However, only the data related to the switch link routing according to the present invention in the processor will be described herein.

The call / connection control processor (CCCP) 100 includes a band management table 110 that manages a state of use of an access switch internal link band and a corresponding free band, and a switch shuffled in multiple stages in an access local system. The library includes a configuration management table 120 that manages the configuration to be shuffled, and a Switch Link Resource Handling Software Block (SLRHF) 130 that controls the management tables to perform the actual path setting. It exists as a software block of the form.

In addition, the operation / preservation processor (OMP) 200 includes a band management table 210 for managing the use state of the central link internal link band and a corresponding free band, an access local system (ALS) and a central local system (ACS). A shuffled shape between the band management table 220 that manages the use state of the switch link bands therebetween and the spare bands corresponding thereto, and the shuffled switches of the central local system (ACS) connected to the access local system (ALS) ( a configuration management table for managing a configuration (230), and a switch link path control block (SLPCF) 240 for controlling the management path to perform a real path setting by controlling the management tables; It exists as a software block in the form of a library.

The various routing management tables are collectively referred to as a switch link table to provide necessary data according to various routing settings during the execution of the sequential control method according to the present invention.

Figure 1 shows the overall sequence configuration of the call path is formed between the originating subscriber and the called party by the sequential path control path control method according to the present invention.

Unexplained parts of the drawings are processes commonly used in call / connection in an ATM switching system having a switch having a conventional multi-stage structure, so only the features of the present invention will be described herein.

If a SETUP message requesting call / connection establishment from the originating subscriber 9 arrives at the call / connection processing block of the originating call / connection control processor (CCCP) (1),

The call / connection processing block of the calling party calls the switch link resource management block (SLRHF) to check the resource usage status of the calling party. That is, the internal access of the outgoing access switch (ASW) examines the band usage state and selects the access switch (ASW) internal link that satisfies the band required by the subscriber for the current call / connection setup. It reserves the band usage of the selected inner link and responds with the number of the reserved access switch (ASW) inner link to the originating call / connection processing block (2).

In order to identify the number of the called party and set the route from the calling party to the called party, the called number is translated into a Number Translation Control Software Block (NTCF) that translates the called number in the OMP. And route setting (3).

The number translation control block (NTCF) of the operation / preservation processor (OMP) translates the called number to find the number of the subsystem belonging to the called subscriber and then calls the switch link path control block (SLPCF) library. After setting the switch link path from the originating subscriber to the incoming access local system (ALS), the call / connection processing block of the calling party / connection control processor (CCCP) is notified of the completion of number translation and routing (4).

The call / connection processing block of the calling party notified of the number translation and routing establishment releases the band of the internal link of the reserved outgoing access switch (ASW), and the internal link number of the selected outgoing access switch (ASW) handed over from the called party. Update the internal link band management table of the calling party access switch (ASW) using (5). Then, the called party routing request is made to the call / connection processing block of the called party's call / connection control processor (CCCP) (6).

The call / connection processing block of the incoming call / connection control processor (CCCP) that has received the internal SETUP message calls the incoming call processing function of the switch link resource management block (SLRHF) using the library call function to set the path of the called party. . The switch link resource management block (SLRHF) called from the call / connection processing block of the called party checks the resource usage status of the called party. That is, after checking the bandwidth usage of the internal link of the called party's access switch (ASW), the called party's access switch (ASW) can be set between the calling subscriber and the called subscriber's access local system (ALS). Find internal links. And updates the bandwidth usage of the found access link (ASW) internal link (7) and informs the originating call / connection processing block of the completion of the called-path processing. Is done.

Referring to the features of the present invention shown in Figure 1 step by step as follows.

In the first step, when the call / connection processing block of the calling party / connection control processor (CCCP) receives the call / connection establishment request SETUP message by the calling party, the switch link resource management block (SLRHF) manages the switch link resources. Call

In the second step, the called switch link resource management block (SLRHF) checks the bandwidth usage status of the internal link of the originating access switch (ASW) to select an access switch (ASW) internal link that satisfies the band required by the subscriber. Make a reservation. In addition, this information is notified to the calling / connection processing block, and the called number translation and routing setting is required in the OMP number translation block for the identification of the called party and the establishment of the route between the called and the called party. .

In the third step, the NTCF of the operation / preservation processor (OMP) translates the called number, and establishes a switch link path control block (SLPCF) that searches for the number of the subsystem of the called subscriber and controls the switch path. Call

In the fourth step, the switch link path control block (SLPCF) establishes a switch link path between the originating subscriber and the destination access local system (ALS), and the call / connection processing block of the originating call / connection control processor (CCCP). Notify that number translation and route have been established.

In the fifth step, the call / connection processing block of the calling party notified of the completion of the translation and routing releases the bandwidth of the internal link of the reserved outgoing access switch (ASW) and transfers the selected outgoing access switch (ASW) transferred from the called party. The internal link band management table of the originating access switch (ASW) is updated by using the internal link number of the < RTI ID = 0.0 > It sends an internal SETUP message requesting the called party's routing to the call / connection processing block of the called party's call / connection control processor (CCCP).

In the sixth step, the call / connection processing block of the incoming call / connection control processor (CCCP) that receives the internal SETUP message calls the switch link resource management block (SLRHF) of the called party to set the path of the called party.

In the seventh step, the called party's switch link resource management block (SLRHF) checks the bandwidth usage status of the called party's internal access switch (ASW) internal link to establish a connection between the calling subscriber and the called subscriber's local system (ALS). Look for a configurable called party access switch (ASW) internal link. It updates the bandwidth usage of the access switch (ASW) internal link and informs the originating call / connection processing block that the called party routing is completed. In this way it is possible to control the routing between the calling party and the called party.

Figure 2 shows the sequence of the originating processing function in the switch link (SLRHF) located in the originating call / connection control processor (CCCP) in the step 2 of the sequential path control method according to the present invention.

In the second step, as shown in FIG. 2, the switch link resource management block SLRHF manages an outgoing access switch (ASW) internal link band to allow a bandwidth required by a user in the SETUP message to be satisfied. Investigating whether an access link (ASW) internal link having a band exists (21).

If there is no access switch (ASW) internal link with a spare band, call / connection processing is terminated. If there is an access switch (ASW) internal link having a spare band, a step 22 of reserving band use of the access switch (ASW) internal link is performed.

Then, the step of loading the outgoing access switch internal link number reserved for the use of the band in the called number translation and routing request message is performed (23).

Finally, the called number translation and routing request message is transmitted to the switch link path control block (SLPCF) of the operation / preservation processor (OMP) to perform the step 24 of requesting the inter-call origination.

3 is a flowchart illustrating the incoming processing function of the fourth step performed by the switch link SLRHF located in the called party call / connection control processor CCCP during the execution of the sequential path control method according to the present invention.

In the fourth step, as shown in FIG. 3, the user has a management table in which the switch link path control block SLPCF, which receives the library call from the number translation control block NTCF, manages the internal link band of the central switch CSW. Step 31 is performed to check if there is a central switch (CSW) internal link that satisfies the required band BW.

If there is no central switch (CSW) internal link that satisfies the BW, a call number translation and routing response message is transmitted to a call / connection processing block of an outgoing call / connection control processor (CCCP). Perform step 32.

If there is a central switch (CSW) internal link that satisfies the BW, a step 33 of selecting the link as a central switch (CSW) internal link to be used for the path between originating and receiving is performed.

The internal link band management table of the access local system (ALS) finds whether there is a switch link between the calling access local system (ALS) and the central local system (ACS). And finding (34) a switch link between the central local system (ACS) and the called party access local system (ALS) connected via the same central switch (CSW) module as the determined central switch (CSW) internal link. Do this.

If no valid switch link is found, step 35 returns to the central switch CSW internal link table and repeats the operation of searching for a new central switch CSW internal link until the last link is found.

If a valid switch link is found, the switch table connecting the originating access local system (ALS) and the central local system (ACS) and the central switch (CSW) internal link are updated in the management table. In addition, step 36 is performed to update, in the management table, the band usage of the switch link connecting the incoming access local system ALS and the central local system ACS.

And transmits a routing setup completion message to the source terminal of the calling access local system (ALS) through the calling subscriber, the calling access local system (ALS), and the central local system (ACS) to the calling party / connection control processor (CCCP). Step 37 is performed.

4 is a switch link resource management block (SLRHF) that manages a switch link resource of a called party called by a call / connection processing block of an incoming call / connection control processor (CCCP) during the execution of the sequential path control method according to the present invention. ) Shows a flowchart in which the seventh step is performed.

In the seventh step, as shown in FIG. 4, a called party access that can connect a previously set switch path and a called subscriber while having a free band required by a user in a management table managing an incoming access switch (ASW) internal link band. The switch (ASW) performs a step 41 of checking the presence of the internal switch link.

If there is no internal switch link with the spare band, the call / connection processing is terminated after transmitting a switch link information response message indicating a call / connection establishment failure to the calling party / connection control processor (CCCP). Step 42 is performed.

Updating the use of the bandwidth of the internal link of the access switch (ASW) to the internal link band management table (ASW) when there is an internal switch link having a spare band; Do this.

A step 44 of notifying the originating call / connection control processor (CCCP) of completion of routing is performed.

5 is a flowchart of an incoming processing function performed by a switch link resource management block (SLRHF) located in an originating call / connection control processor (CCCP) in a fifth step during the execution of the sequential path control method according to the present invention.

As shown in FIG. 5, the fifth step includes receiving an incoming call completion message from a called party's call / connection control processor (CCCP) in the switch link resource management block (SLRHF) and analyzing the result of the message (51). ).

As a result of the analysis, if the routing between the called parties fails, step 52 of releasing the reserved band of the access switch (ASW) internal link reserved by the calling party and terminating the call / connection process is performed.

If the routing between the origination and the destination is successful, step 53 of selecting the link value of the set access switch ASW, which is the selected outgoing access switch (ASW) internal link information carried in the incoming processing completion message, is performed.

Using the link value, the reserved band of the internal link of the originating access switch (ASW) is released, and the use of the band occupied by the actual occupied link is updated in the internal table of the access switch (ASW).

And the setup message of the called party's call / connection control processor (CCCP) including the path information from the originating subscriber set in the OMP to the input terminal of the incoming access local system (ALS) through the central switch (CSW). A step 55 of transmitting to the call / connection processing block is performed.

In the sequential path control method in an ATM switching system having a switch having a multi-stage structure according to the present invention, a point-to-point and point-to-multipoint switched virtual connection (SVC) is performed by a point-to-point and point-to-multipoint signal processed in an ATM switching system. Connection) In all types of calls / connections, including conventional PSTN, PSDN, FR calls / connections, as well as point-to-point and point-to-point multipoint fixed virtual connection (PVC) calls / connections by system operator commands. Efficient network resource management and optimal path establishment provide high speed data processing and exchange.

Claims (5)

When the call / connection processing block of the calling party / connection control processor (CCCP) receives the call / connection setup SETUP message of the calling party, the calling link resource management block (SLRHF) that manages the calling party switchlink resource is called. Step 1; The called switch link resource management block (SLRHF) selects and reserves an access switch (ASW) internal link. The switch link resource management block (SLRHF) informs the originating call / connection processing block and transmits the number translation control block (NTCF) of the operation / maintenance processor (OMP). Requesting translation of the called number and establishment of a route to the mobile station; A third translation control block (NTCF) of the operation / maintenance processor (OMP) translates the called number, finds the number of the sub-system to which the called subscriber belongs and calls the switch link path control block (SLPCF) for switch path control Steps; The switch link path control block (SLPCF) establishes a switch link path between the originating subscriber and the terminating access local system (ALS), and translates and routes the number to the call / connection processing block of the originating call / connection control processor (CCCP). A fourth step of notifying that the service is set up; The call / connection processing block of the calling party notified of the number translation and path setting completion releases the band of the internal link of the reserved outgoing access switch (ASW), and sets the internal link band management table of the outgoing access switch (ASW). Updating, and sending a called party path setting internal SETUP message to a call / connection processing block of a called party call / connection control processor (CCCP); A sixth step of calling, by the call / connection processing block of the incoming call / connection control processor (CCCP), which has received the internal SETUP message, to call the switch link resource management block (SLRHF) to set the path of the called party; The called party's switching link resource management block (SLRHF) establishes a path between the calling party and the called party via the called access local system (ALS), and the called party routing is completed in the calling party / connection processing block. And performing a seventh step of notifying, that the path setting between the calling subscriber and the called subscriber is sequentially controlled. The method of claim 1, The second step, The switch link resource management block (SLRHF) checks whether an access switch (ASW) internal link having a free bandwidth required by the user in the SETUP message exists in a management table that manages an outgoing access switch (ASW) internal link band. Steps; Ends call / connection processing if there is no access link (ASW) internal link with a spare band, or uses the bandwidth of the access switch (ASW) internal link if an access link (ASW) internal link with a spare band exists. Reserving; Placing an outgoing access switch internal link number reserved for use of the band in a called number translation and routing request message; Transmitting the called number translation and routing request message to a switch link path control block (SLPCF) of an operation / preservation processor (OMP), and performing a step of requesting the establishment of an inter-call destination. Sequential Path Control Method in ATM Switching System with Switch. The method of claim 1, The fifth step, Receiving, by the switch link resource management block (SLRHF), an incoming call completion message from a called party call / connection control processor (CCCP) and analyzing the result content of the message; Releasing the reserved band of the access switch (ASW) internal link reserved by the calling party and terminating the call / connection process when the routing between the called parties fails as a result of the analysis; Selecting a link value of the set access switch (ASW), which is the selected outgoing access switch (ASW) internal link information carried in the incoming processing completion message, if the path between the origination and the destination is successful; Releasing a reserved band of an originating access switch (ASW) internal link using the link value, and updating the bandwidth usage of an actually occupied link in an access switch (ASW) internal table; Call of the called party / connection control processor (CCCP) with a setup message containing the path information from the originating subscriber set up in the OMP to the input end of the incoming access local system (ALS) via the central switch (CSW). Sequential path control method in an ATM switching system having a multistage switch, characterized in that the step of transmitting to the connection processing block. The method of claim 1, The fourth step, The switch link path control block (SLPCF), which receives the library call from the number translation control block (NTCF), satisfies the user's required band BW in the management table managing the internal link band of the central switch (CSW). Examining the presence of an internal link; If there is no central switch (CSW) internal link that satisfies the BW, transmitting a response message indicating a path establishment failure to a call / connection processing block of an originating call / connection control processor (CCCP); If there is a central switch (CSW) internal link that satisfies the BW, selecting the link as a central switch (CSW) internal link to use for the path between originating and outgoing; In the internal link band management table of the access local system (ALS), find out whether there is a switch link between the calling access local system (ALS) and the central local system (ACS), and the central local connected via the same central switch (CSW) module. Finding a switch link between the system ACS and the called party access local system ALS; If no valid switch link is found, returning to the central switch (CSW) internal link table and finding the last new central switch (CSW) internal link; If a valid switch link is found, the switch link between the originating access local system (ALS) and the access central subsystem (ACS), the central switch (CSW) internal link, the incoming access local system (ALS) and the central local system ( Updating in each band management table the band usage of the switch link connecting the ACS); Transmitting a routing completion message from the originating subscriber to the originating access local system (ALS) and the input end of the incoming access local system (ALS) to the originating call / connection control processor (CCCP); Sequential path control method in an ATM switching system having a multi-stage switch, characterized in that for performing. The method of claim 1, The seventh step, The called party's switch link resource management whether the called party's access switch (ASW) internal switch link that has a spare band connected to the called subscriber is already present in the management table managing the called access switch (ASW) internal link band. Examining by block SLRHF; If there is no internal switch link with the spare band, the call / connection processing is terminated after transmitting a switch link information response message indicating a call / connection establishment failure to the calling party / connection control processor (CCCP). Making a step; Updating the use of the bandwidth of the access switch (ASW) internal link to the called-side access switch (ASW) internal link band management table if there is an internal switch link having a spare band; And informing the originating call / connection control processor (CCCP) of the completion of the routing.

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