KR100224318B1 - Lan traffic handling method in atm switching system of public network - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a LAN traffic processing method using ATM end equipment.

2. The technical problem to be solved by the invention

The present invention is to provide a LAN traffic processing method for performing a LAN service through the asynchronous delivery mode termination equipment in the public network asynchronous delivery mode switching system.

3. Summary of Solution to Invention

The present invention relates to a LAN traffic processing method applied to an public network asynchronous transfer mode (ATM) switching system, wherein the asynchronous transfer mode (ATM) end equipment receives a LAN service request and changes a logical address to a physical address. A first step of retrieving a first table for resolving a destination address or transmitting a message for setting up the first table to the public network asynchronous transfer mode (ATM) switching system; And the public network asynchronous delivery mode (ATM) switching system searches for a second table for changing a logical address to an asynchronous transfer mode (ATM) terminal equipment address and resolves the called party address, and then requests an update of the first table. And a second step of performing call processing.

4. Important uses of the invention

The present invention is used in public network ATM switching system.

Description

LAN Traffic Handling Method in Public Network Asynchronous Transfer Mode (ATM) Switching System

The present invention relates to a LAN traffic processing method for processing a LAN (Local Area Network) service through an ATM end device in an Asynchronous Transfer Mode (ATM) switching system. 2931 relates to a method for processing LAN traffic using signaling.

In a shared medium LAN, network speed is deteriorating due to lack of bandwidth, which shows a limitation in accommodating multimedia services. This is aggravated by the increase in network users and the amount of data to be transmitted according to various types of applications between the terminal and the server. To solve this problem, the switching technology can be introduced into the LAN to increase network efficiency and speed. In LAN switch, each port can be grouped into virtual LAN, and multi-casting and broadcasting traffic supported by existing LAN can be managed by group to promote efficient network use. It can also be realized. In addition, a direct connection between the two ports can be established to prevent excessive congestion caused by media sharing. In other words, network traffic can be managed efficiently.

ATM LAN is a high-speed local area network service to provide LAN service based on ATM, which emerged as a solution of the existing LAN to the limitations in service quality due to transmission speed and connectionless service. However, the current spread of broadband integrated network (B-ISDN) terminals and the provision of ATM applications have been insufficient. The existing LAN services are provided at higher speeds and higher quality by accommodating the already established data communication networks and existing applications in ATM networks. It was necessary to make a plan, and the realization of it has emerged as ATM LAN. Technology for LAN service in private ATM network is already being realized, but technology for supporting LAN traffic service in public ATM switching system based on International Telecommunication Union (ITU-T) Recommendation E.164 numbering system Is absent.

The realization of ATM LAN in private network is easy because it is easy to solve technical problems and the installation cost is relatively low, but there are no cases of providing LAN service in public network. In IP (Internet Protocol) switching technology, which is a technology considered when interworking with an Internet network and a private ATM network, whether IP packets should be forwarded on an ATM switcher according to the characteristics of an application rather than guaranteeing quality of service, or an IP address may be transferred to an ATM virtual path identifier / We are interested in whether IP data is transmitted through ATM switching by mapping to a virtual path identifier (VPI / VCI) / Virtual Channel Identifier (VPI) number. It is simply an approach of controlling the IP packet using the router function or controlling the IP packet using the signaling function of the ATM switch. In addition, the Forum on ATM proposes Multiprotocol over ATM on ATM. This protocol is based on ATM User Network Interface (UN) 3.0 / 3.1 / 4.0, which is basically applicable to private networks.

Services on the Internet basically support only best-effort services. That is, the data traffic was serviced without any guarantee using the first-come first-serve (FCFS) technique. However, users have demanded multimedia traffic requiring wide bandwidth, and existing local area networks (LANs) cannot satisfy these various user requirements.

Therefore, the present invention can be implemented without any hardware modification of ATM switching system by using the International Telecommunication Union (ITU-T) Recommendation Q.2931 signaling implemented on public network ATM switch that will be used as the basis for the implementation of the national high speed network. It is an object of the present invention to provide a LAN traffic processing method for performing a LAN service through an ATM end device in an public ATM switching system by adding a software module.

1 is a structural diagram of a public ATM network switching system for LAN traffic processing according to the present invention,

2 is a block diagram illustrating a call processing module and a block in a public ATM network for LAN traffic processing according to the present invention;

3 is a flowchart illustrating a method for processing LAN traffic through an ATM end device in a public ATM network according to the present invention.

* Explanation of symbols for main parts of the drawings

101: IP host

102: Ethernet / Token Ring

103: ATM Termination Equipment

116: ATM Switch

In order to achieve the above object, the present invention provides a LAN traffic processing method applied to a public switched asynchronous transfer mode (ATM) switching system, wherein the asynchronous transfer mode (ATM) end equipment receives a logical address when receiving a LAN service request. A first step of retrieving a first table for changing a to a physical address and resolving a destination address or transmitting a message for setting up the first table to the public asynchronous transfer mode (ATM) switching system; And the public network asynchronous delivery mode (ATM) switching system searches for a second table for changing a logical address to an asynchronous transfer mode (ATM) terminal equipment address and resolves the called party address, and then requests an update of the first table. And a second step of performing call processing.

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

1 is a structural diagram of a public ATM network switching system for LAN traffic processing according to the present invention. In the drawing, 101 is an IP host, 102 is an Ethernet / token ring, 103 is an ATM end equipment, and 116 is an ATM switch.

Each subscriber's Internet Protocol (IP) host 101 is an ATM router using a CSMA / CD (Carrier Sense Multiple Access / Collision Detection) of IEEE 802.3 or a token ring method of IEEE 802.5 (102). Match with 103 to form a LAN. ATM end equipment 103 is equipped with a commercial ATM interface card to provide the matching of the ATM switch and ATM scheme.

The ATM switching system consists of a transmission network that performs control and transfer of user information and a control network that controls them. The transport network is an Interconnect Switch Network Module (ISNM) 105, which is an internal connection switch network of the ATM Central Switching Subsystem (ACS) 104, and an Access Switch Network Module (ASNM) of an ATM Local Switching Subsystem (ALS) 106. 107, and a switch network portion consisting of a link interface module (LIM) 108 that is responsible for link matching between the ASNM 107 and the ISNM 105, and a subscriber interface module (SIM) responsible for subscriber matching function. ) And a matching portion consisting of a trunk interface module (TIM) 110 that is responsible for a relay line matching function, and a network synchronization part (NSP) 111 providing network synchronization and a system clock. The control network includes a call processing part (CPP) 112 for call control, a number translation part (NTP) 113 for performing number translation processing, a signaling handler part (SHP) 114 for signal processing, and It consists of an Operation and Maintenance Part (OPM) 115 that is responsible for the operation and maintenance of the system.

2 is a block diagram of a call processing module and block in an ATM switching system for LAN traffic service to which the present invention is applied.

User Call Control Module (UCCM) 201 is a module that is responsible for subscriber protocol matching and call control function according to the International Telecommunication Union (ITU-T) Q.2931 protocol. And International Telecommunication Union (ITU-T) Recommendation Q.2931 User Protocol Interface Function (UPIF) block 202, which is responsible for the matching function between the call control layers, and the International Telecommunication Union (ITU-T) Recommendation Q from the UPIF block. .2931 User Protocol Control Function (UPCF) block 203 for receiving subscriber message and performing subscriber call processing, and User Data Handling Function (UDHF) block 204 in charge of subscriber data processing.

The Network Call Control Module (NCCM) 205 is a module that manages relay line protocol matching and call control by the B-ISDN subscriber part protocol, and includes a message transfer part 3 (MTP3) and a B-ISDN subscriber part. Network Protocol Interface Function (NPIF) block 206 that is responsible for matching function between call control layers, NPCF (Network Protocol Control Function) block 207 that is responsible for relay line call processing by receiving B-ISDN subscriber part message from NPIF block. , And a network data handling function (NDHF) block 208 that performs relay line related data processing.

Semi-Permanent Connection Control Module (SPCCM) (209) is a module that is responsible for operator registration and related connection establishment and release processing for semi-permanent connection processing, SPVCF (point-to-point semi-permanent connection control function) It consists of a Semi-Permanent Point-to-Point Virtual Connection Function (210) block 210 and a Semi-Permanent Point-to-Multipoint Virtual Connection Function (SMVCF) block 211 that is responsible for the point-to-multipoint semi-permanent connection control function.

The Link Resources Handling Module (LRHM) 212 is a module that manages and allocates and recovers resources for user network interface (UN) links, network node interface (NNI) links, and internal switch link resources. A UNIR Link Resources Handling Function (ULRHF) block 213 that is responsible for UNI link resource management, an NNI Link Resources Handling Function (NLRHF) block 214 that is responsible for NNI link resource management, and an internal switch link resource management. Switch Link Resources Handling Function (SLRHF) block 215, Routing Control Function (RTCF) block 216 for routing control functions, and Route Data Handling Function (RDHF) block 217 for route data processing. do.

The Number Translation Module (NTM) 218 is a module that manages the station number and the called number translation and translation data management function of the called subscriber, and is a NTLF (Number Translation Function in ALS) block responsible for station number translation. ), A NTCF (Number Translation Function in ACS) block 220 which is responsible for translation of the called number, and a NDHF (Number Data Handling Function) block 221 which is responsible for number data processing.

Finally, an Internet Service Control Module (ISCM) 222 added for LAN service is an Internet Call Control Function (ICCF) block 223 and an Internet Service Control Function (ISCF) responsible for LAN service control functions. Block 224.

TABLE 1

IP address (Decimal) MAC address (Hexa) B-ISDN Number (E.164) 129.254.101.100 80a6403 unused 129.254.101.200 7275d59e unused : 129.254.108.255 unused 860-5411 :

TABLE 2

IP address (Decimal) MAC address (Hexa) B-ISDN Number (E.164) 129.254.108.123 62b57055 unused 129.254.108.222 5547e39c unused : 129.254.201.199 unused 860-9999 :

Table 1 is an example of the ARP table configuration of ATM terminal equipment A, Table 2 is an example of the ARP table configuration of ATM terminal equipment B, and descriptions of Tables 1 and 2 will be described later.

ARP (Address Resolution Protocol) is a protocol that maps IP address, which is a logical address assigned to each subscriber, in IP-based data communication network to a MAC (Media Access Control) address, which is a physical address. This is the procedure to find the address of called party for direct (physical) connection to called party. ATMARP, unlike the ARP (IP address-to-MAC address) described above, is a protocol that maps IP addresses to a numbering system based on the International Telecommunication Union (ITU-T) Recommendation E.164, which provides over ATM. In other words, there will be a mapping between the logical IP address and the corresponding International Telecommunication Union (ITU-T) Recommendation E.164 number.

The ARP table is stored and used in ATM end equipment. This table is used to find the physical address of the called terminal. It consists of an IP address as a key, a MAC address for providing existing LAN services through a router, or a B-ISDN address for supporting direct ATM connections. Each ATM end device connected to an ATM switching system has its own IP subnetwork, which is a collection of IP subscribers within the category of class C in the IP address system. For example, this is a set of subscribers assigned addresses from 129.254.101.1 to 129.254.101.255. Communication between subscribers in the same subnetwork is performed through a function provided by an existing router, and communication to a subscriber in a subnetwork to which it does not belong is performed through an ATM switching system. At this time, use mapping information of IP address: MAC address or IP address: International Telecommunication Union (ITU-T) Recommendation E.164 address in the table according to each case.

TABLE 3

IP address (Decimal) B-ISDN Number (E.164) ATM Termination Equipment Number 129.254.1. * (129.254.1.1-129.254.1.255) 860-0001 One 129.254.2. * (129.254.2.1-129.254.2.255) 860-0002 2 : 129.254.254. * (129.254.254.1-129.254.254.255) 860-0254 254

Table 3 is an example of the ARP table configuration of the ATM switching system, and the description of Table 3 will be described later.

The ATMARP table is stored in an Operation and Maintenance Processor (OPM) that performs the operation / maintenance function of the public ATM switching system. This table contains mapping information between the IP address of the terminating terminal and the International Telecommunication Union (ITU-T) Recommendation E.164 number controlled inside the ATM switching system. In the system initialization phase, the ATM switching system assigns a fixed International Telecommunication Union (ITU-T) Recommendation E.164 address to each ATM end device connected to it. When an address resolution request is received from an ATM end device, the switching system uses the database to find and assign the E.164 address of the International Telecommunication Union (ITU-T) Recommendation for the ATM end device to which the destination IP subscriber belongs. .

3 is a flowchart illustrating a method for processing LAN traffic through an ATM end device in a public ATM switching system according to the present invention.

When a request for a service occurs in an application program of an IP terminal, a service for providing a LAN service is started because the ARP request message, which is an address resolution protocol request message, is transmitted to a router to which the IP terminal is connected (301). Thereafter, the MAC address corresponding to the IP address of the called terminal is retrieved from the ARP table (302). It is determined whether there is a MAC address for the IP address of the called terminal (303). If there is a MAC address, it is determined as a called subscriber in the same subnetwork (304) and LAN traffic is transmitted through the existing router (305). If the MAC address corresponding to the IP address of the called terminal does not exist, the procedure for address resolution is performed again. Register a new destination IP in the ARP table (306), encapsulate the destination IP address (307), and assign the called party number to its end equipment (ITU-T). Set to E.164 of the Recommendation (308). The encapsulation method is based on the content defined in Request For Comment (RFC) 1483 of the Internet Engineering Task Force (IETF). The setup message is then sent to the UPIF block of the ATM switching system (309).

The procedure of performing LAN service in an ATM switching system is initiated while receiving a setup message in the UPIF block. The UPIF block checks the field of the numbering plan identification (npi: numbering plan identification) information element in the setup message to check whether the called party number is a number according to a private numbering plan (PNP) (310). If it is the ISDN number, control is transferred to the UPCF block which performs the general call processing procedure (311). If the number is based on the private number plan, the ICCF block directs the setup to proceed with address resolution (312). An ATMARP request message is sent to the ISCF block to determine the International Telecommunication Union (ITU-T) Recommendation E.164 address mapped to the IP address (313). The ISCF block obtains the International Telecommunication Union (ITU-T) Recommendation E.164 address that maps to the IP address of the called party with the ATMARP table (314). The address resolution result is sent to the ICCF block in the ATMARP response message. The ICCF block transmits a Call Proceeding or Setup Response message to the end equipment connected to the public ATM switching system (315), which includes information for updating the ARP table of the end equipment. This information is the International Telecommunication Union (ITU-T) Recommendation E.164 address of the IP terminal. This information is used to enable the IP terminal to perform an ATM connection immediately without an ATMARP request message in subsequent traffic transmissions. The ICCF block sends address resolution information to the end equipment and then completes the call connection by proceeding with the call handling procedure by the International Telecommunication Union (ITU-T) Recommendation Q.2931 signaling (316).

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

As described above, the present invention can satisfy the user's needs by ensuring the quality of various services used by the user in the interworking problem between the Internet network and the public network ATM network currently being researched and developed. It is possible to guarantee the TCP / IP-based quality of service provided by the ATM using the ATM signaling provided by the public network ATM exchange. The significance of using the ITU-T Recommendation Q.2931 signaling is significant.

Claims (3)

In the LAN traffic processing method applied to the public network asynchronous transfer mode (ATM) switching system, Upon receiving a LAN service request, an Asynchronous End Mode (ATM) end device searches a first table for changing a logical address to a physical address to resolve a destination address or asynchronously transmits a message for setting up the first table. A first step of transmitting to an ATM switching system; And The public network asynchronous transfer mode (ATM) switching system searches for a second table for changing a logical address to an asynchronous transfer mode (ATM) end equipment address, resolves the called party address, and requests an update of the first table. And a second step of performing call processing. The method of claim 1, The first step is, When the asynchronous transmission mode (ATM) terminal receives the address resolution protocol request message from the Internet terminal, the physical address for the Internet address of the destination terminal exists after searching the first table to resolve the address of the destination Internet terminal. Determining a third step; A fourth step of transmitting LAN traffic through the asynchronous delivery mode end device by determining that the called subscriber is in the same sub-network if a physical address exists as a result of the third step; And As a result of the determination in the third step, if there is no physical address, the address of the new destination Internet terminal is registered in the first table, and the encapsulation number is assigned to the international telecommunication association (IST). ITU-T) The fifth step of transmitting the setup message to the public asynchronous transfer mode (ATM) switching system after setting to Recommendation E.164. The method according to claim 1 or 2, The second step, The public network asynchronous delivery mode (ATM) switching system, upon receiving the setup message, checking the field of the number plan identifier information element in the setup message to determine whether the called number is a number according to a private number plan; A seventh step of performing a general call processing procedure, if the determination result of the sixth step is a broadband integrated information network (B-ISDN) number; And As a result of the determination in the sixth step, if the number is based on the private number plan, a terminating subscriber address request message is transmitted to obtain an International Telecommunication Union (ITU-T) Recommendation E.164 address from the second table and the first table. LAN traffic processing method comprising the eighth step of updating and performing a call processing procedure.

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