KR100438902B1 - Switched Virtual Connection service method for multiple interface user call in ATM switching system and apparatus thereof - Google Patents

Abstract

The present invention relates to a switched virtual connection (SVC) service method and apparatus for multiple subscribers in an ATM switching system. In the multi-subscriber call service method of an ATM switching system, (a) a virtual path identifier logical port for each virtual path identifier (B) establishing a signaling channel for user-network interface signaling on the logical port created in step (a); (c) receiving the call setup request from the multiple subscribers and distinguishing the multiple subscribers; Since a connection identifier is provided to the exchange system, the exchange system creates a VPI port by predetermine a VPCI for distinguishing the VPI for signaling with multiple subscriber terminals, and uses the VPCI as a key when interworking with the exchange system. Classify VPI ports and assign VCI in VPI corresponding to connection factor to provide separate service for each terminal. Can.

Description

Switched virtual connection service method for multiple interface user call in ATM switching system and apparatus

The present invention relates to the field of communication services provided by an ATM switching system, and more particularly, to an SVC service method and apparatus for a multi-subscriber call in which a plurality of subscribers share a single physical link in an ATM switching system.

ATM switching system must be able to accommodate various kinds of subscribers, and each subscriber station must have ATM matching function. In particular, for the switched virtual connection (SVC) function, it must have a function of processing a user-network interface (hereinafter referred to as UNI) protocol defined by a standardization organization such as ITU-T or ATM FORUM. The protocol function consists of a message stack and information elements specified by the protocol, operating on a finite state machine with a protocol stack according to the recommendations. In order for these protocol messages to be communicated with each other, a separate channel must be promised between the subscriber station and the switching system. The separate channel usually has a channel of which the virtual path identifier (hereinafter referred to as VPI) of the corresponding physical link is 0 and the virtual channel identifier (hereinafter referred to as VCI) is 5 when there is no restriction. Set to process. Such a channel is called a signaling channel among control channels, and a function for channel synchronization and AAL matching is required before delivery of such a message. This is called SAAL. After SAAL is activated, information is exchanged through the aforementioned channels. That is, through this, the type of service desired by the subscriber, the address and QoS information of the desired counterpart subscriber station are encapsulated in a message in the form of an information element and delivered.

One of these Connection Identifier information elements is associated with a data channel that is established locally only between ATM interfaces. The connection identifier information element carries information of the data channel in the link at the subscriber station or at the switching system. When requesting a separate required channel, input the information of the corresponding channel, and if receiving this, the data channel is set as the desired channel. On the contrary, if there is no channel, the connection identifier information element can be removed. In addition, if you want to use the data channel, that is, VCI, for the VPI, such as the VPI of the signaling channel, you can transfer information with the corresponding meaning. The description so far is a case of a single subscriber station in a single link that does not need a virtual path connection identifier (hereinafter referred to as VPCI), and in this case, there is no limitation even if it has only VPI information. However, the meaning of VPCI is important for accommodating multiple subscribers in the present invention and should be used in practice. The VPCI is an identifier of the VPI used to accommodate multiple subscribers to which the VP CrossConnector is connected. VPI itself is an identifier of VP, but VPCI is an identifier of VPI. When connected to VP cross connector, VCI is used when subscriber terminal or switching system cannot know the actual VPI of other party.

The technical problem to be solved by the present invention is to create a logical port of the virtual path identifier to solve the above problems, SVC service method and apparatus for a multi-subscriber call in an ATM switching system that can receive a separate service for each terminal To provide.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing the method on a computer.

1 is a block diagram showing an exchange system to which the SVC service apparatus according to the present invention is applied.

2 is a diagram illustrating a structure diagram of a relation of a VPI logical port for a multi-subscriber interface according to the present invention.

3 is a diagram illustrating a configuration of multiple interfaces according to the present invention.

4 is a diagram illustrating a flow of an SVC service method for a multi-subscriber call in an ATM switching system according to the present invention.

5 is a diagram illustrating a flow for VPI port generation for multiple interfaces according to the present invention.

6 is a diagram illustrating a flow for registering a UNI signaling channel of a VPI port according to the present invention.

7 is a diagram illustrating a flow for connection manager assignment during call control in a VPI port generated in the present invention.

In the ATM switching system according to the present invention for achieving the above object, the SVC service method for a multi-subscriber call, in the multi-subscriber call service method of the ATM switching system, in the multi-subscriber call service method of the ATM switching system, (a Generating a virtual path identifier logical port for each virtual path identifier; (b) setting a signaling channel for user-network interface signaling to the logical port created in step (a); (c) the multi-subscriber Receiving a call setup request from the service provider, and identifying the multiple subscribers and providing a connection identifier to the exchange system.

In the ATM switching system according to the present invention for achieving the above object, the SVC service apparatus for a multi-subscriber call, generating a virtual path identifier logical port for each virtual path identifier in an ATM switching system performing a service for a multi-subscriber call. Logical port controller; User-network interface protocol controller for setting a signaling channel for user-network interface signaling to the logical port generated by the logical port controller; Receives a call setup request from the multi-subscriber to distinguish and connect the multi-subscriber And a user-network interface call control unit for providing an identifier to the switching system.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

When accepting multiple subscribers in an ATM switching system, a method of configuring a corresponding signaling channel and a method of configuring a port are required. If one physical link is connected to the VP cross-connector and the VPI and VPCI information are given by the VP cross-connector, there is a need for how to handle it.How to set up a signaling channel on such a port In addition, when the actual SVC service starts, a procedure of allocating resources such as VPI and VCI according to setup message information should be performed. When multiple subscribers are delivered to a single physical link through the VP cross connector, the subscriber manages only the VPI information used by him regardless of the VPCI. In order to process the virtual UNI (Virtual UNI), it must be reflected in the port information, and a method of performing the virtual UNI call service is needed.

1 is a block diagram showing an exchange system to which the SVC service apparatus according to the present invention is applied.

In the ATM switching system, the SVC service on the UNI interface means providing the desired service in the network at the time desired by the user in the physical link, and defines the meaning in the protocol. The protocol is negotiated through the standardization body. Basically, ITU-T's DSS2 signaling standard and ATM-Forum's UNI3.0, UNI3.1, and UNI4.0 are typical examples. Such signaling is transmitted through a predetermined signaling channel. For this purpose, the signaling channel should be established and synchronized with the terminal in advance. In general, one signaling channel is configured on one physical link. In this case, messages are exchanged using VPI of 0 and VCI of 5. However, in order to use a single physical link with multiple subscribers, the VP cross-connector must be connected in the middle to manage separate subscribers in units of VPI. At this time, whether to set a signaling channel for each VPI or control with one channel will be described in detail below.

In FIG. 1, an Access Multiplex Module (AMM) 110, a Media Gateway Module (MGM) 120, and an ATM Interface Module (AIM, 130) refer to an external interface module. . That is, it is an interface module for UNI (User network Interface) or NNI (Network Network Interface). The switch fabric module (SFM) 190 represents a switch module, and the workstation module 180 (WSM) is a workstation module for operator matching or operation maintenance function. The multi-subscriber processing shown in the present invention is performed in the SVC service apparatus 100, and the ATM call controller 140 (hereinafter referred to as ACC), the switch management controller 150, and the access multiplex controller ( Access multiplex controller 160 and a media gateway controller 170.

The ACC 140 is a basic processor for call control of an exchange system and performs functions for a plurality of application blocks. Among them, the logical port control unit 141 (Logical Port Control Function Block, hereinafter referred to as LPCF) performs a logical port management function according to setting of a logical port for multi-subscriber management and operator matching, status and shape in the present invention. It performs functions such as setting up signaling channel, creating and deleting VPI port. That is, it receives information including the presence or absence of a logical port of the physical link type and the range of the VPI, checks the presence or absence of the logical port and the range of the VPI from the input information, and creates and stores the VPI logical port.

The user network interface protocol control unit 143 (hereinafter referred to as UNPCF) and the user network interface call control unit 145 (hereinafter referred to as UNCCF) are multi-subscribers or general users. It is in charge of UNI SVC function such as subscriber. The UNPCF 143 is responsible for functions related to protocols and SAAL interfaces, and generates a virtual path identifier signaling channel as a protocol type for user-network interface signaling with a predetermined number of virtual path identifier logical ports, and whether there is an input logical port. And checking whether the link type of the corresponding logical port is a user-network interface type and requesting the signaling channel with the VPI number of the corresponding port to the UNCCF 145 to register the signaling channel.

The UNCCF 145 provides a function of controlling a service provided by a switching system for a connection requested by a subscriber. The UNCCF 145 receives a message requesting a call service from a multi-subscriber through a signaling channel, and determines the suitability of the message and the components of the message. It checks the information including the suitability and the existence of the connection identifier, identifies the information content of the connection identifier and assigns the virtual channel identifier according to the identified information.

The switch management controller 150 (hereinafter referred to as SCM) performs a function of controlling the switch fabric module (SFM) 190 and the access multiplex controller (AMC) 160 controls the AMM 110. MGC (Media Gateway Controller, 170) performs a function to control the MGM (120).

FIG. 2 is a diagram showing the structure of a relation of a VPI logical port for a multi-subscriber interface according to the present invention. FIG. 2 (a) shows the configuration of the logical port number and FIG. 2 (b) shows the relation of the logical port relation. The configuration is shown.

Fig. 2A is a configuration of a logical port number, which may also be a key for logical port release (hereinafter referred to as R_LPORT_INF). The logical port number should have physical shape information (16 bits) as a base, which can be changed depending on the switch device. However, it is not necessary to know what the physical shape means in other connection control functions. The ATM information divided by the general switch control protocol indicates which specific control system manages the corresponding GSMP port on one switch. Therefore, the logical port needs control system information, which is expressed as a master (5 bits). Multiple logical ports can be created on one master, which can be up to a virtual path. In order to indicate this, the logical port configuration has a unique number of its own port, which is represented by a logical port identifier (11 bits) as shown in FIG.

Fig. 2B shows the structure of the logical port relation R_LPORT_INF with the above logical port number (LPORT number) as a key.

First, the logical port is the VPI range or the VCI range, and the forward and reverse bandwidths represent the basic ATM link resources. The link type points to either UNI or NNI. This refers to the cell type in the ATM layer of the ATM system. UNI and NNI are different in cell format. In the case of the UNI protocol, the link type is UNI. Logical port types are divided into three types, which are independent of a physical link type when a logical port is mapped to one physical link, a group type where several physical links are mapped to a logical port group, and a VPI on a physical link. It is divided into logical virtual path connection (represented by Logical VPC) type which guarantees bandwidth and virtual path identifier associate (referred to as VPI Associate) type which has only VPI independently. The Logical VPC type is a case where a certain bandwidth is guaranteed by being connected to a specific subscriber, and the VPI Associate type is a port where only VPI is guaranteed. The Logical VPC type and the VPI Associate type are commonly referred to as VPI ports. According to the type of service, an operator command can set and release a VPI port, which will be described in detail with reference to FIG. 5.

The state of the logical port represents the state of the port and is divided into three categories: normal, down, and block. Normal indicates that the port is available for service, and Down indicates that the port is not ready or in an abnormal state that cannot be serviced. Block status is the case that the service is restricted because the port is normal or abnormal according to the operator's request. The logical port group is a case in which the type of the logical port is a group type, and represents the group number in the case of the group type. 1 for non-group ports.

VPI port represents the original logical port to which the VPI port corresponds. That is, when multiple VPI ports are created in a logical link of a certain physical link type, the original logical port is represented in each VPI port so that the relationship between the VPI ports in one link can be known in the multi-subscriber service. Protocol means a specific protocol used for the logical port for SVC service. In case of UNI, protocols such as DSS2, UNI3.1, and UNI4.0 can be assigned. The procedure of protocol registration is described in FIG.

The virtual UNI is a virtual UNI number assigned for the virtual UNI service in the present invention and is used to distinguish a case where several VPI ports have the same VPCI in one physical link port. This is described in detail in FIG. 7. The VPCI number is a number assigned to each VPI for the independent service of the subscriber for the multi-subscriber service and can be distinguished through signaling. An example of detailed use is described in detail in FIG. 3.

ILMI indicates whether the port accepts ILMI functions. The AW value and Agg_Token indicate the attributes of the link when using the PNNI protocol. The service availability rate is the ratio of the logical port's utilization range according to the operator's request, and 100 means 100%.

3 is a diagram illustrating a configuration of multiple interfaces according to the present invention, where a network means a switching system.

FIG. 3A illustrates a case in which a single subscriber is classified and serviced by VPI through a virtual path cross connector (hereinafter referred to as a VP cross connector). At this time, the subscriber station must have its own VPI and the corresponding VPCI, and the network must have its own VPI and the VPCI value promised with the subscriber station. For example, if a subscriber station has a table of VPCI 10 in VPI 0, VPCI 11 in VPI 1, and VPCI 12 in VPI 2, Network A will select VPCI 10 in VPI 20 and VPCI 11 in VPI 21. Must have In Network B, VPI 22 should have VPCI 12. In addition, a signaling channel for the UNI protocol must be established between the subscriber station and the network, and multi-subscriber service is possible through a message through the signaling channel. As shown in (a) of FIG. 3, the subscriber should first establish a signaling channel of VCI 5 where VPI is 0, which means that the signaling channel of VCI 5 should be configured in VPI 20 of the switching system through the VP cross-connector. it means. If the subscriber station is connected to a single switching system in FIG. 3 (a), it is not necessary to use a VP cross connector, but only one signaling channel may be set in VPI 0. This is because a single signaling channel can control multiple VPI ports. However, in the state configured as shown in (a) of FIG. 3, the subscriber station can control VPI 20 and 21 through the signaling channel of VPI 20, and in network B, VPI 2 of the subscriber station can be serviced to VPI 22. Even if the signaling channel is inevitable. The procedure of the exchange system for enabling the service according to the present invention is as follows. First of all, network A needs to register the VPI port. The VPI port of VPI 20 (VPCI is 10) and VPI 21 (VPCI 11) is created by finding the logical port of the physical link type connected to the VP cross connector. This follows the flow of FIG. 5. Network B also creates VPI 22 (VPCI 12) VPI ports. In Network A, the signaling channel is set to VPI 20, and in Network B, it is set to VPI 22. Of course, the subscriber station registers signaling channels at VPI 0 and 2 by appointment. The flow of channel registration and multi-subscriber service procedures follows FIGS. 6 and 7.

3 (b) is a diagram showing the acceptance of multiple subscribers. The subscriber station is connected to the VP cross connector through different links and is composed of a single link between the VP cross connector and the network. As described above, it can be classified as a VPI, and subscribers can use the same VPI. However, to distinguish between subscribers, it should have different VPCI values. In the figure, since two subscriber stations using VPI 0 are connected to one VP cross connector, they should have different VPCI values, and the subscriber stations should clearly distinguish them. If the upper subscriber station uses VPCI 10 for VPI 0 and VPCI 11 for VPI 1, the following subscriber station must have 12, rather than 10,11, VPCI in VPI 0 by appointment. VPI 1 must also have a unique VPCI equal to 13. The VP cross-connector should also distinguish the physical interface and the VPI from the network. Similar to 3-1, the network must have a relationship between the VPI port and the VPCI, and each subscriber station must register the signaling channel at VPI 0 to register the signaling channel at 20 and 22 in the network. In this case, the subscriber station can access more than one subscriber and assign different VPCIs each time and match them with the network. When a subscriber station is added, there is a burden of knowing all VPCIs of all currently connected subscriber stations. In order to solve this problem, the subscriber station uses the same VPCI as its own VPI and requires a virtual UNI function as a way to avoid having to have separate VPI and VPCI tables. The virtual UNI allocates the virtual UNI number of the subscriber station according to ILMI or other operator input while using the VPCI value of the different VPI ports in the network as the user's VPI value. After that, the corresponding VPI port can be distinguished by the VPCI and the virtual UNI number. This is illustrated in FIG. 7.

4 to 7 will be described together with FIG. 1.

4 is a diagram illustrating a flow of an SVC service method for a multi-subscriber call in an ATM switching system according to the present invention.

In the ATM switching system, a VPI logical port (virtual path identifier logical port) is created for each VPI promised for the physical link type logical port connected to the VP cross connector (step 410), and a signaling channel for UNI signaling is generated in the generated VPI logical port. When the call setup request is received from the multi-subscriber terminal through the signaling channel, the multi-subscriber is distinguished and the connection identifier is provided by the switching system according to the request of the subscriber terminal (step 430). It will perform the service. Details of each step will be described below with reference to FIGS. 5, 6, and 7, respectively.

5 is a diagram illustrating a flow for VPI port generation for multiple interfaces according to the present invention.

An operator can create one or more VPI ports on a logical port of a physical link type that is already created. First, the WSM 180 of FIG. 1 accepts an operator's request (step 510). Information input at this time is to receive the logical port, VPI and VPCI of the existing physical link type, and the virtual UNI number, forward and reverse bandwidth as required. In the LPCF 145 of the ACC 140, the logical port of the input physical link type is checked in R_LPORT_INF (FIG. 2B) according to the request for generating the VPI port (step 520). If the corresponding logical port exists and it is confirmed that the logical port is a physical link type, check the range of the input VPI value. At this time, the VPI should not be 0 and should not be outside the VPI range of the logical port of the physical link type (step 530). Next, the type of logical port depends on whether bandwidth is given (step 540). When bandwidth is given, it is necessary to guarantee or limit the service band of a subscriber related to a specific VPI in the network, and in this case, a change due to subtraction of the forward and reverse band input from the current remaining bandwidth of the corresponding physical link is necessary. (Step 550). If the bandwidth is not given, only the VPI is promised, and the subscriber station does not need to limit the band, but is free to use it or is used when the bandwidth is already limited in the subscriber station. After the above confirmation, a new VPI port is created and added to R_LPORT_INF. The logical port number consists of 4 bytes as described in Figure 2. The VPI uses a single input VPI and the band is specified as mentioned above. If not, the value of the logical port of the physical link type is input as it is. The logical port type is Logical VPC or VPI Associate. The VPI port is the physical link type number. The protocol is NONE. The virtual UNI number is entered. Save to the relation (step 560) and output the saved contents and new VPI port to the operator (step 570). You might think that it is not necessary to create a VPI promised to all subscribers as ports to accommodate multiple subscribers, but once a connection is made through the VP cross connector, only VPIs connected through the VP cross connector will be available on that physical link. It is meaningful and does not make sense because other VPIs are not used. In addition, since services are classified according to the types of VPI ports and signaling channels can be registered in the corresponding ports, it is desirable to create one independent VPI port.

6 is a diagram illustrating a flow for registering a UNI signaling channel of a VPI port according to the present invention.

The registration of the signaling channel to the logical port is done regardless of the type of logical port. The same routine can be used, either physical link type or VPI type port. That is, when the operator registers as a UNI signaling port in a specific logical port (step 610), the input information receives only the logical port number. At this time, the LPCF 145 of the ACC 140 checks whether an input logical port exists and checks only whether a protocol is currently registered (step 620). If there is no logical port or protocol is already registered, it stops executing and prints it to the operator. If this is satisfied, the link type of the logical port database is checked (step 630). If UNI, continue the process. Now, the signaling channel setup begins. When a UNI port registration request is made to a UNCCF (143) block among UNCCF (143) and UNPCF (141) blocks that perform the UNI SVC function, the UNCCF (143) requests this to the UNPCF (141) and sends a signaling channel to the logical port. Register (step 640). The LPCF 145 is notified of the result of the registration of the signaling channel (step 650) and the result is output to the operator (step 660).

7 is a diagram illustrating a flow for connection manager assignment during call control in a VPI port generated in the present invention.

As described above, when the registration to the signaling channel of the logical port is completed, all of the subscriber services are ready. In the present invention, when the above operation is successfully completed for the multi-subscriber service, only the resource allocation and classification of the VPI port created through the SVC call control function remain.

The SVC call control function in the UNI is started by sending a SETUP message from the subscriber station. The message, of course, starts with the signaling channel described earlier. The UNPCF 141 block of the ACC 140 transmits a SETUP message to the UNCCF 143 (step 710). In this case, the received SETUP message is analyzed to check whether there is a problem with the message or other information elements constituting the message (step 720). If there is no error, the connection identifier information is analyzed from the SETUP message and the corresponding connection identifier is assigned. The connection identifier may or may not enter the SETUP message. In addition, even if included in the SETUP message, it should be processed differently according to its meaning (step 730). In the case of the VCC (Virtual Channel Connection), which is included first, there may be a VP-associate request and an Explicit VPCI request. The VP-associate request is a request for connection by assigning a corresponding signaling channel to a VCI in a set VPI. In this case, no separate information is required. Since the network already knows the VPI of the signaling channel, it is allocated within the corresponding VPI (step 740). In the case of explicit VPCI, the VCI value in the corresponding VPI is allocated according to the previously allocated VPCI value. If the connection identifier is not included in the SETUP message, there is no restriction as it means that it is irrelevant to the network assignment. Referring to Figure 3 as an example. When the subscriber station of VPI 0 makes a VP-associate request through the signaling channel as shown in (a) of FIG. 3, since the A network is VP-associated within VPI 20, the VCI in VPI 20 is allocated to notify the subscriber. You can do that. Similarly, in the B network, a VP-associated VCI may be allocated to VPI 22. However, if there is a desire to establish a connection to VPI 1 at the subscriber station, there may be two methods. First, a signaling channel is set up in VPI 1 to request a VP-associate. In the network, we will set VCI to VPI 21. If you want to use the signaling channel in VPI 0, then use VPCI. That is, the message Explicit-VPCI and the corresponding VPCI information are sent to the network A through the SETUP message. In Network A, the VPCI value is 11, and VPI 21 corresponding to the corresponding VPCI value is found and the VCI value is assigned to obtain the connection identifier. The same applies to the case of FIG. 3B. If all protocols accept the VP-associate function and the UE has no problem in configuring the signaling channel, the signaling channel may be configured and requested for the VP-associate for each VPI port. At that time, the value of the VPCI is meaningless, and only the VP is connected as promised in the VP cross connector, and the subscriber station may accept the function independently for each VPI. However, there is a problem in this case. First of all, protocols like UNI4.0 do not accept VP-associate functionality. In addition, although it is independent to have a signaling channel for every VPI, there are disadvantages in that it is inefficient at the terminal or network level and wastes resources seriously. To overcome this, a virtual UNI function was proposed in UNI4.0. The virtual UNI function can be used to replace the VP-associate function. Also, even though multiple subscribers use the same VPI and VPCI, they can handle the setup by the network. As shown in Fig. 6, when a setup request comes up with explicit VPCI and VPCI values specified, the virtual UNI number of the logical port is checked first (step 751). If the virtual UNI number is not specified when creating the VPI port, search for the VPI port with the same physical link port among R_LPORT_INF in the VPCI value included in the SETUP message (step 753). Since the VPI port and the VPCI value are already registered when the VPI port is created, the VCI of the corresponding VPI port is allocated (step 755). At this time, it should be noted that the logical port of the same physical link type must have its own VPI port, and since the VPCI value is unique, it cannot be processed if two or more VPI ports satisfy this. If you have a virtual UNI number, you must find a port that meets the three conditions in the logical port relation. That is, it has the same physical link type logical port as its own VPI port, the virtual UNI number must be the same as its own port, and has the same VPCI value as the explicit VPCI value specified in the SETUP message. If found, it allocates a VCI within the actual VPI for that port. Because the virtual UNI function can distinguish the subscriber by the virtual UNI number, the subscriber station does not have its own VPI and VPCI information, so the VPI number is used as the VPCI number. Also, protocols without VP-associate functions such as UNI4.0 can effectively use the virtual UNI function.

Finally, if there is no information on the connection identifier in the SETUP message, the port must be selected in the network. In this case, the virtual UNI number (ID) of the corresponding port is first checked (step 761). If it is not a virtual UNI port, one of the VPI logical ports that has the same physical link type logical port as the VPI port is selected. The method selects a port that satisfies the above conditions in the relation of R_LPORT_INF and satisfies the bandwidth required by the subscriber station for each VPI logical report found (step 763). The call proceeds by assigning a VCI to the VPI of the selected VPI logical report (step 765). If a setup request is made to the virtual UNI port without a connection identifier, the VPI logical report that satisfies the UNI port and VPI port number of the virtual UNI port is sequentially selected from R_LPORT_INF. As described above, when the selection of the connection identifier is completed, the procedure of allocating the connection identifier on the multi-subscriber interface is terminated by loading the allocated connection identifier in the CALL PROC message and returning it to the subscriber station of the signaling channel that sent the SETUP. The call then continues and the ATM service is initiated via the connection identifier selected at the time the call service begins.

The invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, hard disk, floppy disk, flash memory, optical data storage device, and also carrier waves (for example, transmission over the Internet). It also includes the implementation in the form of. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

As described above, according to the present invention, the ATM switching system has the greatest feature that can provide various kinds of services through a virtual connection. The reason for this capability is the virtual connection, which is possible through VPI and VCI in ATM. Therefore, the ATM service can be represented by multiple connections on one physical link regardless of the required bandwidth. However, when one subscriber station uses one physical link exclusively for an ATM switching system, various service connections are possible in one signaling channel. However, since there is only one subscriber, there is no need to distinguish between subscribers. However, there may be a demand for ADSL or other low speed subscribers to share a single physical link. In this case, a concentrator is needed for the physical connection. Concentrators are available through the VP cross-connector, and ATM switching systems are enabled by the promise of interconnecting subscriber stations or VPIs of subscriber stations on a VPI basis.

According to the present invention, when one or more subscribers want to perform an SVC function using one or more VPIs, a method for processing them in an exchange system is provided. The subscriber station may request allocation of connection identifiers between switching systems in various ways through signaling messages with only the VPI and VPCI tables. If the subscriber station wants to configure the SVC channel in its signaling channel, it transmits data meaning VP-associate to the connection identifier information element of the SETUP message. At this time, the subscriber station does not need to consider the relationship table of the VPI or VPCI. The network responds by assigning a VCI corresponding to this request. If a subscriber station wants to designate a specific VPCI, it also conveys the meaning of Explicit VPCI in the connection identifier information element of the SETUP message, and delivers the desired VPCI in its table. At this time, as mentioned earlier in the network, the VCI port is requested by the subscriber station among the already created VPI ports and the VCI is allocated. The subscriber station may not send any connection identifier regardless of this. In this case, the port information is retrieved from the network, and the VPCI and VCI of the port that meet the conditions are assigned and forwarded. Finally, there is a case in which the subscriber station wants to identify only the subscriber station's VPI in the network without knowing the relationship between the VPI and the VPCI, and may also use its own VPI as the VPCI information. In this case, the connection identifier may be assigned by selecting one of the ports pre-allocated by the virtual UNI number in the network.

Claims (20)

In the multiple subscriber call service method of the ATM switching system, (a) generating a virtual path identifier logical port for each virtual path identifier; (b) setting a signaling channel for user-network interface signaling on the logical port created in step (a); And (c) receiving the call setup request from the multi-subscribers, distinguishing the multi-subscribers, and providing a connection identifier to the switching system; SVC service method for a multi-subscriber call in an ATM switching system. The method of claim 1, wherein step (a) (a1) receiving information including a presence or absence of a logical port of a physical link type and a range of the virtual path identifier; (a2) checking a presence of a logical port and a range of a virtual path identifier among the inputted information; And (A3) SVC service method for a multi-subscriber call in the ATM switching system comprising the step of generating a virtual path identifier logical port from the inputted information to data and store. The method of claim 2, wherein step (a1) SVC service method for a multi-subscriber call in the ATM switching system, characterized in that it further comprises the step of receiving information on the number, forward bandwidth and reverse bandwidth of the virtual user-network interface. The method of claim 1, Distinguishing whether the logical port is a logical virtual path connection type or a virtual path identifier associate type, and subtracting a bandwidth from the logical port of the physical link type when the logical virtual path connection type is used. SVC service method for multi-subscriber call in system. The method of claim 4, wherein The logical virtual path connection type is a type that guarantees independent bandwidth for each virtual path identifier on a physical link, and the virtual path identifier associate type is a type that guarantees only the virtual path identifier. SVC service method for. The method of claim 1, wherein step (b) The SVC service method for a multi-subscriber call in the ATM switching system, characterized in that it further comprises the step of registering a protocol for user-network interface signaling to the logical port created in step (a). The method of claim 1, wherein step (b) (b1) generating a virtual path identifier signaling channel with a predetermined number of the virtual path identifier logical ports according to the protocol type registered in claim 5; (b2) checking whether a link type of the logical port where the signaling channel is generated is a user-network interface type; (b3) requesting a signaling channel with a virtual path identifier number of a corresponding port; And (b4) SVC service method for a multi-subscriber call in an ATM switching system comprising the step of registering a signaling channel to the corresponding port. The method of claim 1, wherein step (c) (c1) receiving a message for requesting a call service from multiple subscribers through the signaling channel and confirming information including suitability of a message or suitability of elements constituting the message; (c2) checking the presence or absence of a connected identifier and determining the information content of the connected identifier when the step (c1) is confirmed; And (c3) SVC service method for a multi-subscriber call in an ATM switching system comprising the step of assigning a virtual channel identifier according to the identified information. The method of claim 1, wherein in step (c), Checking whether the connection identifier information is a virtual path-associate or an spreadsheet-virtual path connection identifier or determining whether there is no connection identifier information. SVC service method for. The method of claim 9, The virtual path associate associates a signaling channel with an established virtual channel identifier to request a connection, and the spreadsheet-virtual path connection identifier allocates a virtual channel identifier according to a value of a pre-assigned virtual path connection identifier. SVC service method for a multi-subscriber call in an ATM switching system characterized in that the information. The method of claim 9, wherein step (c3) If the connection identifier is confirmed to be a virtual path-association, SVC service method for a multi-subscriber call in the ATM switching system, characterized in that for assigning a virtual channel identifier in the virtual path identifier that the signaling channel is set. The method of claim 9, wherein step (c3) If the linkage identifier is found to be an exit-virtualpath linkage identifier, (c3-1) checking IDs of virtual user-network interfaces of the virtual path identifier logical ports; And (c3-2) SVC service method for a multi-subscriber call in an ATM switching system, wherein the virtual channel identifiers corresponding to the logical ports are allocated. The method of claim 12, wherein step (c3-2) In step (c3-1), if the ID of the user-network interface of the virtual path identifier logical ports is not specified, the virtual channel identifier is assigned to a logical port where the logical port of the physical link and the virtual path connection identifier value match. SVC service method for a multi-subscriber call in an ATM switching system characterized by allocating. The method of claim 9, wherein step (c3) If it is determined that there is no information of the connected identifier, SVC service method for a multi-subscriber call in an ATM switching system, characterized in that the physical link type logical port assigns a virtual channel identifier value to a port satisfying a bandwidth among the same virtual path identifier ports. In an ATM switching system that performs services for multiple subscriber calls, A logical port controller configured to generate a virtual path identifier logical port for each virtual path identifier; A user-network interface protocol controller configured to set a signaling channel for user-network interface signaling on the logical port generated by the logical port controller; And SVC service apparatus for a multi-subscriber call in an ATM switching system comprising a user-network interface call control unit for receiving the call setup request from the multi-subscriber to distinguish the multi-subscriber and provide a connection identifier to the switching system . The logic port controller of claim 15, wherein the logical port controller Receives information including the presence or absence of a physical link type logical port and the range of the virtual path identifier, checks the presence of the logical port and the range of the virtual path identifier among the input information, and generates and stores the virtual path identifier logical port. SVC service apparatus for a multi-subscriber call in an ATM switching system. 16. The apparatus of claim 15, wherein the user-network interface protocol controller The virtual path identifier signaling channel may be generated as a protocol type for user-network interface signaling using a predetermined number of the logical path identifier logical ports, and the presence or absence of the input logical port and the link type of the corresponding logical port may be a user-network interface type. SVC service apparatus for a multi-subscriber call in an ATM switching system, characterized in that the signaling channel request to the virtual path identifier number of the corresponding port to the user-network interface call control unit to register the signaling channel. 16. The call controller of claim 15, wherein the user-network interface call control unit Receives a message for requesting a call service from the multi-subscriber through the signaling channel, and confirms the information including the suitability of the message or the elements constituting the message and whether the connection identifier is present and the information content of the connection identifier; SVC service apparatus for a multi-subscriber call in an ATM switching system, characterized by allocating a virtual channel identifier according to the identified information. The method of claim 15, A switch management control unit controlling a switch fabric of the ATM switching system; An access multiplex controller for interfacing multiple accesses of the multiple subscribers with the ATM switching system; And And a media gateway controller for interfacing the ATM switching system with a network. A computer-readable recording medium having recorded thereon a program for executing the method of claim 1 on a computer.