KR100268182B1 - Method for call processing between different networks in large communication processing system - Google Patents

Abstract

PURPOSE: A method for processing calls between mutually different kinds of networks in a high-capacity communication processing system, is provided to enable every information user included in a subscriber network to connect with every IP(Information Provider) included in an IP network for services, and to use logical numbers allocated by the switching module when every network interface module connects with another network interface module, so that each network interface module can uniformly manage various kinds of call connection using the logical numbers. CONSTITUTION: Each network interface unit configures a communication path state table. Call setup is requested to an SASS(Subscriber Access Sub System) by a call connection request of a user. The SASS requests the allocation of logical channel numbers to an HSSF(High-Speed Switching Fabric), to transmit the call connection request to an IASS(Information Provider Access Sub System) and operate a timer for a call connection request process. If the IASS receives a call setup request through the HSSF, a response process for each call connection request is performed according to the end of the timer, and data transmission is performed between the user and the IASS. If data transmission between the user and the IASS is completed or the connection setup is failed, the SASS and the IASS transmits a call connection release request for releasing logical numbers using the HSSF and operates the timer, to perform each call connection release process according to the end of the timer.

Description

Heterogeneous manganese call processing method in large capacity communication processing system

1 is a configuration diagram of a service network of a large-scale communication processing system to which the present invention is applied.

2 is a connection diagram of a network matching system via a switching module.

3 is a software configuration diagram of a network matching system.

4A and 4B are state diagrams showing message formats and message types for call processing according to the present invention.

5A and 5B are state transition diagrams of a call processing protocol according to the present invention.

6A and 6B are a flowchart of a heterogeneous manganese call processing method according to the present invention.

7 is a structural diagram of a communication path state table for each network matching system applicable to the present invention.

8 is a flowchart illustrating a procedure of configuring a communication path state table between network matching systems according to the present invention.

9 is a flowchart for explaining a logical channel allocation procedure.

<Explanation of symbols for main parts of drawing>

11-1: Public Switched Telephone Network (PSTN) 11-2: Telephone Network Matching System (TNAS)

12-1: Integrated Information Network

12-2: Integrated Information Network Matching System (INAS)

13-1: Packet Switched Data Communication Network (PSDN)

13-2: PNAS 14-1: Asynchronous Transmission Network (ATMN)

14-2: Asynchronous Network Matching System (ANAS)

15-1: Internet 15-2: Internet Matching System (KNAS)

16-1: Frame Relay Network (FRN)

16-2: Frame Relay Network Matching System (FNAS)

17: high speed switching device (HSSF) 18: network management device (OAM)

The present invention relates to a heterogeneous network call processing method in a large capacity communication processing system, and more particularly, to a call processing method capable of providing a reliable connection between a subscriber and an information provider connected to a heterogeneous network matching module.

The communication processing system is a gateway station type system that connects subscriber network and service providing network. It connects users who request data service with exchange provider and trunk level and connects with information provider (IP) of packet network. . The communication processing system allows users to use data services through modem modulation without any special devices. However, due to the ever-increasing number of data communications and various services, the amount of information through existing networks is increasing exponentially. Not suitable for acceptance Therefore, in order to globalize national information and communication, we are developing a large-capacity communication processing system with an open structure that enables efficient high-speed service provision to users by separating a subscriber network and a service providing network and systematically matching various networks.

This mass communication processing system is based on telephone network and packet network, and is a network matching module that provides a frame relay network, an integrated information communication network (ISDN; hereinafter referred to as ISDN), an asynchronous transmission network (ATM; hereinafter referred to as ATM), and an Internet connection. A group of service support modules including the network management apparatus (OAM: Operation Administration &Maintenace; hereinafter referred to as OAM) for the operation management and maintenance of the entire network, and the modules constituting the large-capacity communication processing system at high speed. It consists of a group of high-speed interconnects that are connected and responsible for the transport of service traffic.

In the high-capacity communication processing system, a telephone network matching system, a packet network matching system, an ISDN matching system, an internet matching system, a frame relay matching system, and an ATM network matching system are provided to provide access services for subscribers and information providers of various networks. do. These network matching systems use different internal protocols to accommodate subscribers or information providers.

However, network matching systems must establish interconnection between subscriber and information provider through high speed switching module and use this connection to provide communication processing service. In addition, since the high-speed switching module in the large-capacity communication processing system does not perform end-to-end guaranteed message transmission, there is a need for a call processing method that provides reliability of a message for establishing a connection between network matching modules. However, there is a problem in that a network matching system using different internal protocols cannot guarantee a reliable connection between a user and an information provider.

Accordingly, an object of the present invention is to provide a heterogeneous network call processing method in a high-volume communication processing system that can solve the above disadvantages by providing a call processing method that can provide a reliable connection between heterogeneous networks.

The heterogeneous network call processing method in the high-capacity communication processing system according to the present invention for achieving the above object comprises the steps of constructing a communication path state table, requesting call setup to a subscriber access subsystem by a call connection request of a subscriber, The subscriber access subsystem requesting logical channel number allocation between fast switching devices to perform a call connection request procedure to an information provider access subsystem, and the information provider access subsystem receives a call establishment request through the fast switching device; Performing a response procedure to the call connection request to perform data transmission between the subscriber and the information provider access subsystem, and the data transmission between the subscriber and the information provider access subsystem is completed or connection establishment is failed. Information Confucius to access the subsystem comprising: performing the call to release the logical channel number connection release procedure using a high-speed switching device is characterized in that formed.

The present invention provides a circuit access technology for data communication connection of a telephone network subscriber, an interface technology between a user and a network for data communication connection of an ISDN subscriber, an X.25 protocol processing technology for a data communication connection of a packet network subscriber and an information provider, and a frame relay network. It is based on the interface technology between the user and the network for accessing the information provider of the ATM and ATM networks, the high-speed switching technology for the interconnection between these network access modules, and the higher protocol processing technology for the communication between the heterogeneous networks.

Each network matching system, which is an end device of a large-capacity communication processing system, receives a call setup request from a subscriber to an information provider, is assigned a number for connection with a switching module, and between the network matching system and the switching module where the information provider is accommodated. It also establishes a connection and establishes a connection between the network matching system and the information provider. Through this connection, a message transfer is made between the subscriber and the information provider. Also, when the service ends, a procedure for disconnecting is performed. The present invention relates to a protocol for establishing and releasing end-to-end connection of such a mass communication processing system.

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

1 is a block diagram of an entire service network of a large-capacity communication processing system in which a call processing method proposed by the present invention is implemented. Telephone Network Matching System (TNAS) 11-2 for Public Switched Telephone Network (PSTN) 11-1 to provide services between heterogeneous networks, ISDN Matching System (INAS :) for ISDN (12-1) access 12-2, packet network matching system (PNAS) 13-2 for packet switched data communication network (PSDN) 13-1 connection, ATM network matching for ATM network (ATMN) 14-1 connection Frame relay network matching system for accessing system (ANAS) 14-2, Internet matching system (KNAS) 15-2 for accessing the Internet 15-1, and frame relay network (FRN) 16-1. (FNAS) 16-2 is connected via a high speed switching device (HSSF) 17. There is a network management apparatus (OAM) 18 for managing all these elements.

2 shows a configuration for connection between network matching systems via a switching module. The subscriber access system 21 has a Diabis driver (D / D) and an application program interface (API) of a High Speed Network Adapter (HSNA) (hereinafter referred to as HSNA) for switching and interface. It has a device driver and an application program interface (API) of a network interface board assembly (NIA) (hereinafter referred to as NIA) for connection with the network.

The information provider access system 23 also has the same structure as the subscriber access system, but the network interface board portion has an interface of a network to which the information provider is connected.

The high speed switching module 22 is connected to a physical layer protocol (PHY) through a network matching system and a high speed network matching board (HSNA), and is equipped with layer 2 (L2) of switching for relaying messages.

3 shows the software configuration of the network matching system. All network matching systems have HSNA device driver 31-1 and application program interface 31-2 for connection with switching module, and NIA device driver 32-1 for application with network. It has a program interface 32-2. The service operation & administration unit 33-1 of the network matching system has its own system manager 33-2, timer manager 33-3, and operation and maintenance (OAM) interface unit 33-4. It is responsible for the overall management of the network matching system, there is a call processing block (33-6) for handling the call when providing the service of the subscriber or information provider and a message relay block (33-5) for message relay. In addition, in the case of a network access system capable of subscriber access, the subscriber's command processing block 33-7 and the charging data processing block 23-8 for generating charging data are in charge of the subscriber's processing.

4A and 4B are state diagrams showing message formats and message types for call processing according to the present invention. In the message type 41 of FIG. 4A, the message type related to call processing is designated as 1 byte. All message types considered in the call processing method proposed by the present invention are call connections as shown in FIG. 4B. Request message 45-1, positive and negative response messages 45-2 and 45-3 for connection request, call release request message 45-4, response message 45-5 for release request Etc. The path of the message is designated by 2 bytes in the sending address 42-2 and the receiving address 42-1, respectively, and the data length 43 represents the length of pure data in 2 bytes. The data 44 portion includes 512 bytes of information of subscribers and information providers depending on each network.

5A and 5B are state transition diagrams of a call processing protocol according to the present invention. In the state transition diagram of FIG. 5A, the subscriber side network matching system is referred to as a subscriber access subsystem (SASS), and in the state transition diagram of FIG. 5B, the information provider side network matching system is the information provider access subsystem. (IASS: Information Provider Access SubSystem; hereafter referred to as IASS).

Referring to FIG. 5A, a state transition of the SASS is shown. The initial state 51 is an idle state, where an outgoing_connection_pending state 52 is received when a call connection request 1 is received from a subscriber. Transition to. At this time, if the connection to the information provider fails (2 and 3), the state transitions back to the initial state 51, and if the connection is successful (4), the state transitions to the Connection_Established state 53. In this state, the data transmission of the subscriber is continued. When the call release request is received from the subscriber (5), the state transitions to the Awaitting_Release state 54, and when the call release confirmation is received from the IASS (6), the state transitions to the initial state 51.

On the other hand, referring to the state transition of the IASS with reference to FIG. 5B, the initial state is an empty state 55, where a call connection request is received from the SASS (9) to an incoming connection (Incoming_Connection_Pending) state 56. If the connection to the information provider fails (2 and 10), then the state transitions back to the initial state 55, and if the connection is successful (11), the state transitions to the Connection_Established state 57. In this state, the data transmission of the information provider is continued. When the call release request is received from the SASS (12), the state transitions to the awaiting_Release state 58, and when the call release confirmation is received from the information provider (13), the state transitions to the initial state 55.

6a and 6b show a flowchart of a heterogeneous network call processing method according to the present invention, FIG. 7 is a structural diagram of a communication path state table between network matching systems, and FIG. 8 is a configuration of a communication path state table between network matching systems according to the present invention. 9 is a flowchart for explaining a logical channel allocation procedure.

Configure the communication path status table between network matching systems from the start signal. The structure of the communication path state table broadcast by each network matching system is shown in FIG. 7. The contents of each field are as follows.

network_id (71): Interface network type of the network matching system

subnetwork_id (72): Type of additional network according to network_id

bus_id (73): Bus type of the high speed switch interface board

bus_state (74): state of bus_id (Good or Bad)

node_id (75): physical port number of the switch

node_state (76): state of node_id (Good or Bad)

The configuration method of such a state table will be described with reference to FIG. 8. First, when the match system is initialized or the state is changed (81), whether the state of the switch board to which the network matching system is connected is good or not (good). or bad) (82), it is determined whether the physical port state of the switch board is good (83). Thereafter, as shown in FIG. 7, the communication path state table for each network matching system is configured (84), and the communication path state table is broadcast (85). Next, the communication path state table of the network matching system that can communicate is received and stored.

In step 601, if a user requests a call connection to a subscriber access subsystem SASS, a call connection request procedure is performed as follows. Referring to FIG. 9, in the call connection request procedure, the subscriber access subsystem (SASS) requests logical channel number assignment to the fast switching device (HSSF) (91). Each network matching system retrieves (92) the communication path state table of the peer akd matching system with which it wants to communicate, and if the state of the switch board and the port is not good, returns the allocated resources (94). Create a logical channel burner (95). Next, the generated logical channel number is mapped with the switch board and port number, the mapping table is configured 96, and the logical channel number is returned. This logical channel number assignment broadcasts the state of the bus for the switch interface to all network matching systems connected to the switch whenever all network matching systems are initialized or when a state change occurs. It is managed by the system. Each network matching device determines the state of the system to be connected, obtains an available bus, matches the assigned bus with a logical number, and uses this logical number for communication.

The network matching system assigned the logical number posts a call setup request packet (using TX_queue), which is written to RAM and forwarded to the other party. The response packet to the call establishment request is received through a queue generated for each logical number. In addition, the SASS assigned the logical number manages the connection information table for each logical number based on the status information table, and transmits and receives all data to the counterpart address of the connection information table until the connection is released.

In the call connection request procedure, the subscriber access subsystem (SASS) first transmits a logical number assignment request (Open_Lun) message to the fast switching device (HSSF) (602), and then checks whether the logical number assignment is successful (603). If the logical channel number allocation of the fast switching device (HSSF) fails, the process proceeds to step 611 where the subscriber access subsystem SASS indicates to the user a logical number allocation failure (Discon_ Indication). The connection between the user and the subscriber access subsystem SASS (Discon_Confirm) is terminated (612).

If the logical number assignment of the fast switching device HSSF succeeds, the subscriber access subsystem SASS sends a call connection request USER_REQ to the information provider access subsystem IASS and then starts the timer (604). .

Thereafter, a response procedure for the call connection request is performed. The daemon processor is always running so that IASS can receive arbitrary data from the HSSF, which receives call setup request packets. If the call establishment request packet is a call request packet corresponding to the call establishment request, the logical channel number allocation is requested to HSSF. Logical channel number assignment is performed in the same way as in the case of SASS, and the IASS assigned the logical number requests a connection to an information provider on the service network. If this connection request succeeds, a call establishment success packet is posted, and if it fails, a call establishment failure packet is posted (using TX_queue), and this packet is written to RAM of the switch and forwarded to the other side. Hereinafter, data of the partner SASS is received through the queue RX_queue corresponding to the logical channel number. In addition, the IASS assigned the logical channel number manages the connection information table for each logical channel number, and then transmits and receives all data to the counterpart address of the connection information table until the connection is released. Referring to the drawings, first, if there is no response to the call connection request (USER_CON_REQ) until the timer expires (605), the number of retransmissions is checked (606). As a result of checking the number of retransmissions, if the retransmission is three or more times, the allocated resources are recovered in the error recovery state (607), and the state transitions to the initial state. On the other hand, if the number of retransmissions is less than three times as a result of the retransmission check, the process returns to step 604 to transmit the call connection request (USER_CON_REQ).

If the timer termination state does not occur in step 605, the logical channel number assignment procedure Open_Lun is performed from the information provider access subsystem IASS to the fast switching device HSSF (608). Check (609). The logical channel number assignment procedure is performed in the same manner as the logical channel number assignment procedure 602 described above with reference to FIG. If the logical channel number allocation is unsuccessful and the logical channel number allocation of the fast switching device (HSSF) fails, the process proceeds to step 610 to request a call connection request from the information provider access subsystem IASS to the subscriber access subsystem SASS. After responding to the connection failure, the subscriber access subsystem (SASS) notifies the user (User) of the logical channel number allocation failure (Discon_ Indication) (611) and the subscriber (User) and the subscriber access subsystem (SASS). The connection is terminated after the connection (Discon_Confirm) 612.

If the logical channel number allocation of the high speed switching device (HSSF) succeeds, the connection establishment (Incoming_Connection) message is transmitted from the information provider access subsystem (IASS) to the information provider (IP) (613), and then the information provider access subsystem ( IASS) checks whether the connection between the information provider (IP) is normal (614). If the connection setting is not performed normally, the information provider notifies the connection provider Discon_Request to the information provider access subsystem IASS (620), and in response, the information provider access subsystem IASS informs the information provider. In operation 621, the connection release (Discon_Confirm) message is transmitted (IP), and the information provider access subsystem IASS transmits a connection failure response (USER_CON_CLR) to the information provider to the subscriber access subsystem SASS (622). ). The subscriber access subsystem (SASS) receiving the connection failure response (USER_CON_CLR) to the information provider terminates after performing steps 611 and 612 of disconnecting the subscriber.

If the connection establishment between the information provider access subsystem IASS and the information provider IP is normally performed in step 614, the information provider IP connects to the information provider access subsystem IASS with a connection success message (Connection_Accepted). 615, the information provider access subsystem IASS sends a connection success response message USER_CON_CNF to the subscriber access subsystem SASS (616). Thereafter, the subscriber access subsystem (SASS) transmits an access message to connect the subscriber (617), and then actual data transmission is performed (618) through the connection call between the subscriber and the information provider.

Then, the call disconnection procedure is performed.

First, the call release request is checked (619), and if there is no call release request (Clear-Request), the process returns to step 618 to continue the relay in the network matching system. However, if the call clearing request is confirmed and the Clear-Request is sent from the subscriber to the subscriber access subsystem (SASS) during the data transmission, the subscriber access subsystem (SASS) is the IAS access subsystem (IASS) to release the call. Send a call release request (USER_CLR_REQ) and start the timer (623). Thereafter, before receiving the response to the call release request, it is checked whether the timer has expired (624). If there is no response to the call release request (USER_CLR_REQ) until the timer expires, the number of retransmissions is checked (625). As a result of checking the number of retransmissions, if the number of retransmissions is three or more times, the allocated resources are returned to the error recovery state and transitioned to the data transmission state (626). Send the request (USER_CLR_REQ).

If the timer termination state does not occur in step 624, the information provider access subsystem IASS sends a clear_indication to the information provider 627, and in response, the information provider accesses the information provider access subsystem. In step 628, a clear_confirm message is transmitted to IASS. Thereafter, the information provider access subsystem IASS sends 629 a call release response (USER_CLR_CNF) message to the subscriber access subsystem SASS, and the subscriber access subsystem SASS has been released to the subscriber USER ( Clear_Confirm) is transmitted (630) and ends.

As described above, the present invention has the following excellent effects.

First, all information and communication users accommodated in the subscriber network of the mass communication processing system can establish a connection with all the information providers accommodated in the information provider network and receive the service.

Second, even though the switching module of the high-capacity communication processing system does not perform end-to-end guaranteed message transmission, it is possible to perform reliable call processing between heterogeneous networks by using a timer management and retransmission method of the network matching system.

Third, all network matching modules of the large capacity communication processing system use logical numbers assigned by switching modules when connecting to other network matching modules, so that each network matching module can manage various types of call connections consistently using logical numbers. .

Claims (7)

Each network matching device constructing a communication path state table, requesting call setup to the subscriber access subsystem by a call connection request of the subscriber, and the subscriber access subsystem assigning logical channel number assignments between the fast switching devices; Requesting to send a call connection request to the information provider access subsystem and to perform a call connection request procedure to start a timer, and if the information provider access subsystem receives a call establishment request through the fast switching device, whether to terminate the timer. Accordingly, the data transmission is performed between the subscriber and the information provider access subsystem by performing a response procedure for each call connection request, and the data is transferred between the subscriber and the information provider access subsystem, or the connection establishment is failed. And information The Confucius Access Subsystem uses a high speed switching device to send a call disconnect request to release a logical number and simultaneously turn on a timer to perform the call disconnect procedure according to whether the timer has expired. A heterogeneous manganese call processing method in a large capacity communication processing system. 2. The method of claim 1, wherein a call connection and disconnection between the subscriber access subsystem and the information provider access subsystem is designated as 1 byte of message type for call processing, and 2 bytes in the source address and the destination address according to the message type. Mass processing system, characterized in that performed using a call processing message consisting of a message path, a data length specified by a pure two-byte length, and 512 bytes of data including information of subscriber and information provider depending on each network. Heterogeneous manganese call treatment in. The method of claim 1, wherein the call connection and disconnection between the subscriber access subsystem and the information provider access subsystem includes a call connection request message, a positive and negative response message for a connection request, a call release request message, and a response message for a release request. Heterogeneous manganese call processing method in a large capacity communication processing system, characterized in that performed using a message type of 1 byte. The method of claim 1, wherein the call connection request procedure comprises the steps of: after the subscriber access subsystem requests the fast switching device logical channel number assignment, checking whether the logical channel number assignment is successful; After the subscriber access subsystem instructs the subscriber to fail to allocate the logical channel number, the subscriber access subsystem disconnects and terminates. If the logical channel number assignment is successful, the subscriber access subsystem returns to the information provider access subsystem. Heterogeneous manganese call processing method in a high-volume communication processing system comprising the step of transmitting a call connection request. The method of claim 1, wherein the response procedure for the call connection request is assigned in the error recovery state when the number of retransmissions is determined by checking the number of retransmissions when there is no response to the call connection request until the timer expires. Recovering resources, transitioning to an initial state, and returning to a call connection request step if the number of retransmissions is less than three; and if the timer termination state does not occur, assigning a logical channel number assignment from the information provider access subsystem to the fast switching device. Requesting and confirming whether the logical channel number allocation is successful, and if the logical channel number allocation of the fast switching device fails as a result of the logical channel number allocation success, disconnecting the connection between the information provider access subsystem and the subscriber access subsystem. And a logical channel number of the fast switching device. If the allocation is successful, sending a connection establishment message from the information provider access subsystem to the information provider, and then confirming that the connection establishment between the information provider access subsystem and the information provider is normal. Terminating and terminating the connection between the information provider access subsystem and the subscriber; and if the connection establishment between the information provider access subsystem and the information provider is successfully performed, the subscriber access subsystem sends a connection message. And transmitting and connecting the subscriber, and then performing actual data transmission through a connection call between the subscriber and the information provider. 2. The call release request procedure of claim 1, wherein the call release request procedure confirms a call release request and continues to transmit data when there is no call release request, and when the call release request is sent, the subscriber access subsystem releases the call to the information provider access subsystem. Sending a request and starting a timer; checking if the timer is expired; if there is no response to the call release request until the timer expires, check the number of retransmissions; Recovering the received resources, transitioning to a data transmission state, and transmitting a call release request if the number of retransmissions is less than three, and if the timer termination state does not occur, sending a release instruction from the information provider access subsystem to the information provider. After that, in response, the information provider can access the information provider access subsystem. Sending a release complete message to the subscriber access subsystem, and the subscriber access subsystem sending and ending the call release response message to the subscriber. A heterogeneous manganese call processing method in a large capacity communication processing system. 2. The network of claim 1, wherein the communication path state table configuration procedure and the logical channel number assignment determination all network connected to the switch determine the state of a bus for a switch interface each time the network matching system is initialized or a state change occurs. Broadcasting to a matching system, acquiring the available bus after grasping the state of a system to be connected by the network matching device, and thus matching the assigned bus with the logical number and then transmitting the matched logical channel number to the communication. Heterogeneous manganese call processing method in a large capacity communication processing system, characterized in that using.