KR20030057669A - Apparatus and method for interface of GGSN system - Google Patents

Abstract

PURPOSE: An interface device for a GGSN(Gateway GPRS(General Packet Radio Service) Serving/support Node) system and a method therefor are provided to simultaneously perform a line interface function and a frame relay function by a single function board. CONSTITUTION: A plurality of frame relay blocks(211) are composed in a board in which an internal interface is performed in a GGSN system. Each of frame relay blocks(211) has an E1 framer(212) for generating and extracting a data frame transmitted through a line connected with each network device(220), and an E1 LIU(Line Interface Unit)(213) for performing an interface to the line.

Description

Interface device and method thereof of JigiSen system {Apparatus and method for interface of GGSN system}

The present invention relates to an interface of a Gateway GPRS Serving / Support Node system, and more particularly, to an interface of a GGSN system and a frame relay function. An interface device and a method thereof are provided.

In the development stage of the mobile communication network, the 3rd Generation Partnership Project (3GPP), 3rd Generation Partnership Project (3GPP2), etc. will go through the 2nd generation General Packet Radio Service (GPRS). GPRS has evolved from the Global System for Mobile Communication (GSM) to add data packet support functional elements to the GSM access network and to provide mobile subscribers with free incoming and outgoing communication. In the 3rd generation, 3GPP synchronous UMTS (Universal Mobile Telecommunication System) sets up a separate packet domain to provide more advanced packet communication in GPRS, and 3GPP2 proposes synchronous CDMA2000.

As a form of 3G mobile communication network, the GPRS network structure of asynchronous IMT2000 includes GGSN, which is one of the network elements. GGSN is responsible for message screening and billing data collection through network access control functions, and routing, address translation / mapping and encapsulation through packet routing and forwarding functions, along with mobility management, performance management, PDP (Packet Data Protocol) address assignment, network interworking, and mobile IP (Mobile Internet Protocol) support.

Frame relay is a technique for simplifying a packet switching technology and a high-speed transmission of frames of an OSI reference model data link layer (Layer 2), and is mainly used for burst data transmission such as inter-LAN connection. This is based on the improvement of the reliability of line-level physical communication, and does not perform retransmission control, thereby improving the speed of data transmission in the network, and users are not only provided with high-speed and low-latency services such as leased / line switching, It is possible to divide and use the band.

The technical details related to frame relay appear in documents published in the International Telecommunications and Communications Subcommittee, ITU-T I.233, I.370, I.372, I.555, Q.922 and Q.933. These frame relays simply relay frames, sending the frames from end to end and do not provide error control.

The procedure of frame relay is divided into ① call control procedure, ② data transmission procedure, ③ congestion control procedure, and ④ network connection procedure. The call control procedure is for performing call setup and release and status checking, the data transmission procedure is for sending and receiving frames, the congestion control procedure is for response / control during network congestion, and the network connection procedure is for another frame. For connection with relay bearer service (FRBS), public digital network and ISDN network.

However, when the GGSN system, which is the next generation technology, is applied to the network environment in which the transmission equipment based on the frame relay technology is operated as a network element, that is, in the process of evolving from the old generation technology to the next generation technology, Coexistence or matching between frame relay functions is required.

The present invention was created to solve the above-mentioned conventional problems, and an object of the present invention is an interface device of a support SN system suitable for achieving matching between an internal interface function and a frame relay function of a GGSN system. And a method thereof.

In order to achieve the above object, an interface device of a support SNS system of the present invention includes a plurality of frame relay blocks in a board configured to perform an internal interface in a GGSN system, and the frame relay block includes a circuit connected to each network device. And a framer unit for generating and extracting a data frame transmitted through a line, and a line interface unit for performing an interface to the line.

In order to achieve the above object, an interface method of a support system of the present invention includes: converting data of a specific format transmitted from each processor through an internal interface of a GGSN system into an E1 / T1 frame; Transmitting the converted E1 / T1 frame to a network device of a destination via a circuit; And receiving the E1 / T1 frame from the network device, converting the E1 / T1 frame into the data of the specified format, and transmitting the same through the internal interface.

1 is a block diagram showing a general packet network configuration to which the present invention is applied.

2 is a block diagram of an interface device of a support BS system according to an embodiment of the present invention;

Figure 3 is a flow chart of the interface method of the support BS system according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

211: frame relay block 212: E1 framer unit

213: E1 line interface unit 220: network device

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

1 is a block diagram showing a general packet network configuration to which the present invention is applied, FIG. 2 is a block diagram of an interface device of a support SN system according to an embodiment of the present invention, and FIG. 3 is a support diagram according to an embodiment of the present invention. It is a flowchart of the interface method of S & N system.

In this embodiment, when the high speed transmission is performed using the existing data transmission system, the existing interface block of the GGSN system maintains the existing frame relay function, so that matching with the new technology is achieved. When operating the GGSN system for high-speed data transmission, it is not possible to immediately replace the devices that previously constituted a network element. Therefore, there is a need for coexistence between these existing devices and the next generation devices.

According to FIG. 1, in a node configuration of a general packet network, a Gn interface is matched between a GGSN system and an SGSN system, and a Gs interface is matched between an SGSN and a mobile switching center (MSC), which is an external node. Apart from the role of SGSN, a frame relay block is located between the GGSN system and the MSC to perform a function of relaying a packet data frame as described above.

In such a network, the frame relay according to the present embodiment provides four E1 / T1 line interfaces. At this time, simultaneous use of the E1 / T1 line interface is not possible. Therefore, separate sub-boards are used to interface with the E1 and T1 lines. In other words, when a single frame relay function and a line interface function are implemented in a board, a sub board configured to perform line interface for each of E1 / T1 is required.

Therefore, a single interface board is designed to include the frame relay function together with the system internal interface function.

FIG. 2 illustrates a case of implementing a single interface board including a frame relay function and an internal system interface function, and corresponds to a case designed to perform an interface to an E1 line. To implement the interface to the T1 line, this method can be applied to a separate sub board.

According to FIG. 2, the interface block in the GGSN system includes a plurality of frame relay blocks 211 for interfacing to transmission lines connected to each network device 220. Since each frame relay block 211 should accommodate the frame relay function, an internal interface unit for the system internal interface, an E1 framer unit 212 for generating and extracting an E1 frame, and an interface to an E1 transmission line are provided. It is configured to include an E1 line interface unit 213.

That is, in the present embodiment, the frame relay function is installed in the GGSN to connect the GGSN with an external device such as a mobile switching center (MSC). The connection is made via an E1 or T1 link.

The connection between the frame relay block 211 and the internal processes (MLP, RPP, PCP) of the GGSN system is made through Asynchronous Transfer Mode (ATM) or Fast Ethernet. This depends on the internal interface of the GGSN system. Therefore, the frame relay function block converts ATM / fast Ethernet data into E1 / T1 and E1 / T1 data into ATM / fast Ethernet data.

Referring to the process of performing the E1 line interface through the operation of the interface device as follows.

First, Ethernet data to be sent from the network processor provided in the GGSN system to the network device 220 through the E1 interface is made into a high-level data link control (HDLC) frame suitable for high-level link control (S31).

The prepared HDLC frames are divided by time division multiplexing (TDM) by a time slot allocation function of a network processor and allocated to each time slot channel (S32 to S33).

HDLC frames allocated to each timeslot are transmitted to the E1 framer unit 212 through an internal interface (S34).

The E1 framer unit 212 converts the transferred HDLC frames into E1 frames (S35).

The E1 frame is transferred to the E1 line interface unit 213 (LIU) (S36).

The E1 frame sent to the E1 line interface unit 213 is converted into an electrical signal and transmitted to the network device 220 of the destination (S37).

The above-described operation corresponds to a case in which E1 data is transmitted from the GGSN system to the network device 220. When receiving data from the network device 220, the reverse process may be performed. That is, when the E1 line interface unit 213 receives the E1 data, the E1 framer unit 212 extracts the HDLC frame from the corresponding E1 frame and delivers the HDLC frame to the network processor through the internal interface.

On the other hand, the process of performing the T1 line interface is the same system as the process of performing the E1 line interface.

The embodiments described above are within the scope of various changes, modifications, and equivalents of the present invention. Therefore, the present invention is not limited to the description of the examples.

According to the interface device and the method of the support BS system of the present invention, it is possible to implement the line interface function and the frame relay function at the same time with a single functional board to enable coexistence between the old generation technology and the new generation technology.

Claims (4)

It has a number of frame relay blocks in the board that are intended to perform internal interfaces within the GGSN system. The frame relay block includes a framer unit for generating and extracting a data frame transmitted through a line connected to each network device, and a line interface unit for performing an interface to the line. Interface device. The method of claim 1, In the case of the frame relay block, a framer unit generates and extracts an E1 frame, and the line interface unit transmits an E1 frame generated by the framer unit to a corresponding network device, and transmits an E1 frame received from a network device. The interface device of the support system, characterized in that the transfer to the framer portion. The method of claim 1, In the case of the frame relay block, a framer unit generates and extracts a T1 frame, and the line interface unit transmits a T1 frame generated by the framer unit to a corresponding network device, and transmits a T1 frame received from a network device. The interface device of the support system, characterized in that the transfer to the framer portion. Converting data of a specific format transmitted from each processor through an internal interface of the GGSN system into an E1 / T1 frame; Transmitting the converted E1 / T1 frame to a network device of a destination via a circuit; And receiving the E1 / T1 frame from the network device, converting the E1 / T1 frame into the data of the specified format, and then transmitting the same through the internal interface.