KR100233840B1 - Structure of Satellite Internet Access Central Station for Accepting Public and Private Internet Addresses and Its Operation Method - Google Patents

Abstract

The present invention relates to a structure of a satellite Internet access center for accommodating public and private Internet addresses simultaneously and a method of operating the same.

Due to the depletion of the Internet address due to the rapid increase in the number of hosts who want to use the Internet, the service provider who provides the Internet access service uses a small number of public Internet addresses and dynamically assigns them to users who require the Internet. Depending on the number of public Internet addresses assigned, there is a limit on the number of accessible users. Alternatively, the private Internet address is used, and the service is provided internally by using the private Internet address and converting it to a public Internet address available when accessing the Internet. However, the subscriber using the private Internet address has a lot of restrictions on the service.

The satellite Internet access center according to the present invention can provide various types of services by allocating a public Internet address or a private Internet address to users by accommodating both a private Internet address and a public Internet address without changing existing systems. To make it possible.

Description

Structure and Operation Method of Satellite Internet Access Central Station for Accepting Public and Private Internet Address Simultaneously

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite internet system, and more particularly, to a structure of a satellite internet access central station and a method of operating the satellite internet access network capable of constructing a satellite internet network which can use a mixture of public and private internet addresses.

Currently, the Internet access service provider provides a service at a transmission speed of 28.8 Kbps in both directions through a telephone modem for individuals who want to use the Internet, but it is not enough to provide an Internet service having various types of traffic characteristics. Accordingly, there is a need for a network capable of providing high-speed internet services, and development of a satellite internet system capable of providing internet services using a satellite network having a broadcast type and capable of high-speed transmission is required. However, in order to construct a satellite Internet system, an internet address is required, but the Internet address of Internet version 4 cannot afford to meet the size of the system to be newly constructed. In addition, due to the rapid growth of TCP / IP networks and the rapid increase of hosts who want to use the Internet, the current Internet address is exhausted.

As a result, the service provider providing the Internet access service uses a method of allocating a small number of public Internet addresses and dynamically assigning them to users who require the Internet, but this is based on the number of public Internet addresses allocated. Bring constraints on

Another method is to use a private Internet address, and to provide a service by using a private Internet address internally and converting it into a public Internet address available when accessing the Internet. However, subscribers using private Internet addresses have many restrictions on their services.

In order to provide various types of multimedia services to satellite terminal subscribers in the environment of such an internet address, a satellite internet is constructed by mixing a public internet address and a private internet address. However, it is not possible to mix and use networks using different addresses using only commercially available network equipment.

Accordingly, the present invention provides a structure and operation method of a satellite Internet access central station that enables the construction of a satellite Internet that accommodates both users using public Internet addresses and users using private Internet addresses without changing existing network equipment. It aims to do it.

The structure of the satellite Internet access center for accommodating public and private Internet addresses simultaneously according to the present invention for achieving the above object is to provide various services to transmit and receive the Internet and Internet packets, and improve the performance of the satellite Internet system. An internal network, a satellite adaptation network which forwards Internet packets received from the internal network to a satellite terminal station, and processes Internet packets to deliver the Internet packets received from the satellite terminal station to the internal network; And a simple router for delivering an internet packet using a public internet address between the satellite adaptive network and an address translator for delivering an internet packet using a private internet address between the internal network and the satellite adaptive network. Characterized in that made.

In order to achieve the above object, a method for operating a satellite Internet access center for accommodating public and private Internet addresses simultaneously according to the present invention includes receiving a CDMA frame transmitted from a terminal station using a private Internet address or a public Internet address at a receiver. And converting the CDMA frame into an internet packet and analyzing a source internet address after receiving the CDMA frame, and analyzing the source internet address at the receiver, wherein the source internet address is a public internet address. In the case where the public Internet packet is transmitted to the simple router, and if the analysis result is the source Internet address is a private Internet address, transmitting the private Internet packet to the address translator, and the simple router receiving the public Internet packet of the public Internet packet Analyze destination internet address Transmitting a public Internet packet to a router after determining a route, and changing the source Internet address of the private Internet packet to a public Internet address and changing a port number to an unused port in the address translator that receives the private Internet packet. Recording the changed information and the changed information in an address conversion table and transmitting the public Internet packet to a router; and determining a path by analyzing a destination Internet address of the public Internet packet at a router that receives the public Internet packet. Transmitting a public internet packet to an internet host, processing the public internet packet at the internet host receiving the public internet packet, and then transmitting the public internet packet to a router, and receiving the public internet address from the router. Minutes the destination Internet address of the packet And determining the route, and if the address of the route determined by the route determination matches the address of the simple router, transmits the public internet packet to the simple router, and if it matches the address translator address, sends the public internet packet to the address translator. Transmitting the public internet packet to a transmitter by a simple router receiving the public internet packet, and a destination corresponding to the address of the address translator on the internet packet at the address translator that has received the public internet packet; Changing the Internet address to a private Internet address of the corresponding terminal station and transmitting the Internet address to a transmitting unit; and converting the public and private Internet packets into a TDM frame form at the transmitting unit which receives the public and private Internet packets. And then transmitting to the terminal station. Characterized in that eojin.

1 is a block diagram of a satellite Internet system to which the present invention is applied.

2 is a block diagram of a satellite Internet access central station according to the present invention;

3 is a router functional block diagram of a satellite internet access central station in accordance with the present invention.

4 is a simple router functional block diagram of a satellite internet access central station according to the present invention;

5 is a block diagram of an address translator function of a satellite internet access central station according to the present invention;

6 is a functional block diagram of an e-mail, web and domain name server of a satellite internet access central station according to the present invention.

7 is a functional block diagram of a transmitter of a satellite internet access central station according to the present invention;

8 is a functional block diagram of a receiver of a satellite internet access central station according to the present invention;

9 is a flowchart of private and public Internet address processing of a satellite Internet access central station in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

110: satellite Internet connection center station 111, 112: terminal using the Internet address

113: network management system 114: multimedia service provider

116, 210: Internet 117: Satellite

211: Router 212: Email Server

213: Proxy Server 214: Domain Name Server

215 Web Server 216 Address Converter

217: simple router 218: transmitter

219: receiving unit 220: RF unit

221: satellite adaptation network 222: internal network

The present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a satellite Internet system to which the present invention is applied, and includes a satellite Internet access central station 110 that provides an Internet connection, a terminal station 111 that uses a public Internet address, and a private Internet address to construct a satellite Internet system. It consists of a terminal station 112 using.

The satellite Internet access central station 110 is connected to the Internet 116, a multimedia service provider 114, a digital broadcasting system 115, and a network management system 113, and uses a public Internet address or a terminal station 111 or a private Internet. The terminal station 112 using the address is provided with various types of services through the satellite 117.

2 is a block diagram of a satellite Internet access central station according to the present invention, which shows network equipment necessary for providing various types of services or equipment necessary for satellite transmission.

The satellite internet access center consists of an internal network 222 and a satellite adaptation network 221. The internal network 222 is composed of general network equipments, and the satellite adaptation network 221 is composed of satellite equipments necessary for transmitting Internet packets to a terminal station using the internal network 222 and satellites.

The internal network 222 is a router 211 necessary for connecting to the Internet 210, an e-mail server 212 for providing a mail service, a web server 215 for providing a web service, and a proxy for improving system performance and security. Server 213 is configured as a domain name server 214 that provides an Internet address for the host name.

The satellite adaptation network 221 is a communication unit 218 for transmitting an Internet packet to a terminal station via a satellite, a receiver 219 for receiving an Internet packet transmitted from the terminal station via a satellite, and actually communicates with the satellite. It is composed of an RF unit 220 to perform.

A simple router 217 and an address translator 216 are used to connect the internal network 222 and the satellite adaptation network 221. Simple router 217 is for processing Internet packets using public Internet addresses, and address translator 216 is for processing Internet packets using private Internet addresses.

3 is a functional block diagram of a router of a satellite Internet access central station according to the present invention, showing functional blocks for transferring Internet packets between an internal network and the Internet.

Looking at the function of each function block, the first and second interfaces 311 and 312 represent the contact point of the Internet and the internal network connected to the router, and the first and second hardware drivers 313 and 314 are the respective function blocks. Control the physical medium of the network that is connected to.

The first and second link layer processing units 315 and 316 perform a function of processing frames transmitted and received through a physical medium, generating Internet packets by using frames when receiving them, and transmitting Internet packets by using physical frames. Change the frame to fit.

The first and second interfaces 311 and 312, the first and second hardware drivers 313 and 314, and the first and second link layer processing units 315 and 316 may vary according to two network characteristics to which they are connected. .

The internet protocol processor 317 transmits the Internet packet, which is received as a block for processing the Internet packet, to the routing processor 318 to determine a path to deliver the Internet packet.

The routing processor 318 determines a route to which the corresponding Internet packet should be delivered using the routing table 319 in which the route information is recorded.

The routed internet packet is transmitted through the first and second interfaces 311 and 312 of the corresponding network.

Each block uses the primitive function of the operating system 310 to perform a corresponding function.

4 is a functional block diagram of a simple router of a satellite internet access central station according to the present invention, and shows functional blocks for delivering Internet packets using public Internet addresses between an internal network and a satellite adaptive network.

Looking at the function of each functional block, the first and second interfaces 411 and 412 represent the contacts between the internal network and the satellite adaptation network connected to the simple router, and the first and second hardware drivers 413 and 414 respectively. Control the physical medium of the network that is connected to the functional block.

The first and second link layer processing units 415 and 416 perform a function of processing frames transmitted and received through a physical medium, and generate Internet packets by using frames when receiving and transmitting Internet packets by using physical frames. Change the frame to fit.

The first and second interfaces 411 and 412, the first and second hardware drivers 413 and 414, and the first and second link layer processing units 415 and 416 may vary according to two network characteristics to which they are connected. .

The internet protocol processor 417 transfers the Internet packet, which is received as a block for processing the Internet packet, to the routing processor 418 to determine a path to deliver the Internet packet.

The routing processing unit 418 does not use a routing table in which independent route information is recorded like a router, and only Internet packets transmitted from the internal network are transmitted to the satellite adaptive network, and Internet packets transmitted from the satellite adaptive network are transferred to the internal network. Only the path for this is determined.

The routed internet packet is transmitted through the first and second interfaces 411 and 412 of the corresponding network.

Each block uses the primitive function of the operating system 410 to perform the corresponding function.

FIG. 5 is a functional block diagram of an address translator of a satellite Internet access central station according to the present invention, which illustrates functional blocks for delivering Internet packets using a private Internet address between an internal network and a satellite adaptive network.

Looking at the function of each functional block, the first and second interfaces 511 and 512 represent the contacts between the internal network and the satellite adaptation network connected to the address translator, and the first and second hardware drivers 513 and 514 respectively. Control the physical medium of the network that is connected to the functional block.

The first and second link layer processing units 515 and 516 perform a function of processing a frame transmitted and received through a physical medium. When receiving, the first and second link layer processing units 515 and 516 generate an Internet packet using a frame and transmit an Internet packet to a physical medium. Change the frame to fit.

The first and second interfaces 511 and 512, the first and second hardware drivers 513 and 514, and the first and second link layer processing units 515 and 516 may vary according to two network characteristics to which they are connected. .

The Internet protocol processing unit 517 transfers the Internet packet received as a block for processing the Internet packet to the address conversion unit 518 to perform the conversion between the private Internet address and the public Internet address, and transmits the completed Internet packet to the network. Passing through the first and second interfaces 511 and 512.

The address translation unit 518 determines whether to perform address translation using the source Internet address or the destination Internet address in the Internet packet, and in the case of the Internet packet to perform address translation, the address translation table 519. Perform internet address translation.

Each block uses the primitive function of the operating system 510 to perform a corresponding function.

6 is a functional block diagram of an e-mail server, a proxy server, a domain name server, and a web server of a satellite internet access central station according to the present invention. The functional blocks exist in an internal network to improve performance of a satellite internet system and provide a service. Indicates.

Looking at the function of each functional block, the interface 611 represents the contact point of the internal network to be connected, the hardware driver 612 controls the physical medium of the internal network connected to each functional block.

The link layer processing unit 613 performs a function of processing a frame transmitted and received through a physical medium. When receiving, the link layer processing unit 613 generates an Internet packet using a frame, and when transmitting, changes the Internet packet to a frame suitable for the physical medium.

The interface 611, the hardware driver 612, and the link layer processor 613 may vary according to characteristics of an internal network to be connected.

The Internet protocol processor 614 may deliver the Internet packet received as a block for processing the Internet packet to the corresponding application program 615 to perform the requested service.

The Internet packet transmitted from the application 615 is delivered to the internal network through the interface 611.

Each block uses the primitive function of the operating system 610 to perform a corresponding function.

7 is a functional block diagram of a transmitter of a satellite internet access center according to the present invention, and shows functional blocks for processing an Internet packet to be transmitted from an address translator and a simple router to a satellite terminal station.

Looking at the functions of the respective functional blocks, the first and second interfaces 711 and 712 represent the contacts between the address converter connected to the transmitter, the simple router and the RF unit, and the first and second hardware drivers 713 and 714. Controls the physical medium associated with each functional block.

The first and second link layer processing units 715 and 716 perform a function of processing a frame transmitted and received through a physical medium, generating an Internet packet using a frame when receiving, and transmitting an Internet packet to a physical medium when transmitting. Change the TDM frame to match.

The first and second interfaces 711 and 712, the first and second hardware drivers 713 and 714, and the first and second link layer processing units 715 and 716 may vary according to characteristics of the connected equipment.

The Internet protocol processing unit 717 transfers the Internet packet received as a block for processing the Internet packet to the link layer processing unit 716 in order to transfer the Internet packet to the RF unit so as to change the TDM frame suitable for the satellite.

Each block uses the primitive function of the operating system 710 to perform the corresponding function.

The transmission unit performs one-way communication unlike a general communication system. That is, the flow of the Internet packet transmitted from the simple router and the address translator may include the first interface 711, the first hardware driver 713, the first link layer processor 715, the internet protocol processor 716, and the second link. The RF is transmitted to the RF unit through the layer processor 717, the second hardware driver 714, and the second interface 712.

8 is a functional block diagram of a receiving unit of a satellite Internet access center according to the present invention. In order to deliver an Internet packet received from a satellite terminal station to a server on an internal network or a host on the Internet, the Internet should be transmitted to an address translator or a simple router. Represents functional blocks for processing a packet.

Looking at the function of each functional block, the first and second interfaces 811 and 812 represent the contact between the address converter connected to the receiver, the simple router and the RF unit, and the first and second hardware drivers 813 and 814. It controls the physical medium of the equipment connected with each functional block.

The first and second link layer processing units 815 and 816 process a frame transmitted and received through a physical medium. The first and second link layer processing units 815 and 816 generate an Internet packet using a CDMA frame transmitted from an RF unit and deliver the Internet packet to a simple router or an address translator. do.

The first and second interfaces 811 and 812, the first and second hardware drivers 813 and 814, and the first and second link layer processing units 815 and 816 may vary according to characteristics of the connected equipment.

The Internet protocol processing unit 817 forwards the Internet packet received in the block for processing the Internet packet to the Internet address comparison unit 818 to determine whether to deliver it to the simple router or to the address translator.

The Internet address comparison unit 818 compares the source Internet address in the Internet packet and sets a path to be delivered to the address translator in the case of an Internet packet transmitted from a terminal station using a private Internet address. In the case of the Internet packet transmitted from the terminal station to be used, the path is set to be delivered to the simple router.

Each block uses the primitive function of the operating system 810 to perform the corresponding function.

The receiver performs one-way communication unlike a general communication system. That is, the flow of the Internet packet transmitted from the RF unit is the second interface 812, the second hardware driver 814, the second link layer processing unit 816, the Internet protocol processing unit 817, and the Internet address comparison unit 818. It is transmitted to the simple router or the address translator through the internet protocol processor 817, the first link layer processor 815, the first hardware driver 813, and the first interface 811.

9 is a flow chart of private / public Internet address processing of a satellite Internet access central station according to the present invention, which includes processing flow of Internet packets between a terminal station using a private Internet address and a host on the Internet, and a terminal station using a public Internet address. Represents the processing flow of Internet packets between hosts on the Internet.

In order to transmit information to a satellite internet access center using a private internet address or a public internet address, a terminal station converts the information into a CDMA frame and transmits the information to a satellite internet access center. Will be received by the receiver.

The receiver converts the CDMA frame into an Internet packet (S1) and then analyzes the source Internet address (S2).

As a result of analysis, when the source Internet address is a public Internet address, that is, a public Internet packet transmitted from a terminal station using the public Internet address, the public Internet packet is transmitted to the simple router. If the source Internet address is a private Internet address, that is, a private Internet packet transmitted from a terminal station using the private Internet address, the corresponding Internet packet is transmitted to the address translator.

The simple router analyzes the destination Internet address of the received public Internet packet, determines the path, and then transmits the public Internet packet to the router (S4).

The address translator changes the source Internet address of the received private Internet packet to its public Internet address, finds an empty port among the ports it is using, changes the port number to this value, and converts it to a public Internet packet. Record the information and the change information in the address translation table. After the address translation is completed, the public Internet packet is transmitted to the router (S3).

The router analyzes the destination Internet address of the received public Internet packet, determines the path, and then transmits the public Internet packet to a host on the Internet (S5).

The host on the Internet processes the received public Internet packet and transmits it to the router to transmit the processing result to the requesting terminal station (S6).

The router determines a path by analyzing a destination Internet address of the received public Internet packet (S7).

If the determined route address matches the address of the simple router, the public Internet packet is transmitted to the simple router, and if the address matches the address translator address, the public Internet packet is transmitted to the address translator (S8).

The simple router determines the path to the transmitter to transmit the received public Internet packet to the terminal station, and then transmits the public Internet packet to the transmitter (S9).

The address translator finds a destination Internet address corresponding to its own address on the received public Internet packet in the address translation table, changes it to a private Internet address of the corresponding terminal station, and transmits it to the transmitter (S10).

In order to transmit the received public and private Internet packets to the terminal station, the transmitting unit converts the Internet packets into TDM frame forms and transmits them (S11).

As described above, when the satellite Internet system according to the present invention is used, it is not only possible to construct a network using only a private Internet address or a network using only a public Internet address, but also a mixed type network using both public and private Internet addresses. Deployment is possible without modification of existing network equipment.

In addition, all terminal stations connected to the internal network may be connected to each other without restriction of public or private Internet address types, and may receive various types of multimedia Internet services.

Claims (4)

An internal network that transmits and receives Internet packets and provides various services to improve the performance of satellite Internet systems; A satellite adaptation network for delivering an Internet packet received from the internal network to a satellite terminal station, and processing an Internet packet to deliver the Internet packet received from the satellite terminal station to the internal network; A simple router for delivering an internet packet using a public internet address between the internal network and the satellite adaptation network; And an address translator for delivering an internet packet using a private internet address between said internal network and said satellite adaptation network. The network of claim 1, wherein the internal network comprises: a router for forwarding Internet packets between the internal network and the Internet; An e-mail server for providing mail services, A web server for providing web services, Proxy server for system performance and security, A structure of a satellite Internet access central station for accommodating public and private Internet addresses simultaneously, comprising a domain name server for providing Internet addresses for host names. The network of claim 1, wherein the satellite adaptation network comprises: a transmitter for processing an Internet packet received from the address translator or the simple router and transmitting the processed Internet packet to the satellite terminal station; A receiving unit for processing the Internet packet received from the satellite terminal station and transmitting it to the address translator or the simple router; A structure of a satellite access center for accommodating public and private Internet addresses simultaneously, characterized in that it comprises an RF unit for actually communicating with the satellite. Receiving at the receiving unit a CDMA frame transmitted from a terminal station using a private Internet address or a public Internet address, Receiving the CDMA frame, converting the CDMA frame into an Internet packet and analyzing a source Internet address; When the source Internet address is a public Internet address as a result of the analysis at the receiving unit, a public Internet packet is transmitted to the simple router, and when the source Internet address is a private Internet address as a result, the private Internet packet is transmitted to the address converter. To do that, Transmitting a public internet packet to a router after analyzing a destination internet address of the public internet packet by a simple router receiving the public internet packet and determining a path; In the address translator receiving the private Internet packet, the source Internet address of the private Internet packet is changed to a public Internet address, the port number is changed to a port that is not in use, and the changed information and the unchanged information are recorded in the address translation table. Sending public Internet packets to the router; Transmitting a public internet packet to an internet host by determining a path by analyzing a destination internet address of the public internet packet at a router receiving the public internet packet; Processing the public internet packet by the internet host receiving the public internet packet and transmitting the same to a router; Determining a route by analyzing a destination internet address of the public internet packet at a router that receives the public internet address; Transmitting the public internet packet to the simple router if the address of the route determined by the path determination matches the simple router address, and transmitting the public internet packet to the address translator if it matches the address translator address; Transmitting the public internet packet to a transmitter by a simple router receiving the public internet packet; Receiving, by the address translator receiving the public Internet packet, a destination Internet address corresponding to the address of the address translator on the Internet packet in an address translation table, changing the address to a private Internet address of the corresponding terminal station, and transmitting the destination Internet address to a transmitter; Transmitting the public and private Internet packets in the form of a TDM frame by the transmitting unit receiving the public and private Internet packets, and transmitting them to the terminal station for accommodating public and private Internet addresses simultaneously. Operation method of satellite internet access center.

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