WO2000036791A1

WO2000036791A1 - Method of external interactive virtual local area network communication

Info

Publication number: WO2000036791A1
Application number: PCT/CN1999/000211
Authority: WO
Inventors: Haiying Wang; Lijun Qin; Xinming Guo
Original assignee: Beijing Satcom Communication Technology Co., Ltd.
Priority date: 1998-12-18
Filing date: 1999-12-21
Publication date: 2000-06-22
Also published as: AU1767000A; CN1258148A

Abstract

The invention relates to a method of external interactive virtual local area network communication. The method designates one unidirectional physical or logical channel between a main station and a user terminal as a virtual local area network, and designates another unidirectional physical or logical channel between the main station and the user terminal as an external interactive network. The main station sends a standard local area network physical frame on the virtual local area network according to the user terminal's physical address. The user terminal transmits a standard local area network physical frame and a broadcasting packet to the main station through the external interactive network, or the user terminal forwards the user terminal's data, physical address and IP address to the main station in the form of the IP packets through the external interacive network. The invention combines the unidirectional fashion and the bi-directional fashion in the traditional communication system, making the existing unidirectional network having bi-directional communication functions.

Description

The present invention relates to a network communication method for an external interactive virtual local area network, and belongs to the field of network communication. In traditional communication systems, people's communication models are symmetrical, and round-trip transmission of information is implemented on a physical medium. For example, when people make a call, both the transmitted and received voices are transmitted on a telephone line in a two-way satellite system, and data is transmitted and received through satellite channels. In order to reduce the cost of the system, many new communication methods have appeared, such as one-way satellite communication systems and one-way cable television systems. However, purely one-way communication users can only receive information passively, and it cannot solve the need for information exchange between users. For example, user A cannot access the materials of the user's day library. Local area network communication can meet the needs of information exchange between online users. A local area network is a network that uses broadcasting and media sharing. Its essential feature is that the local area network data packets sent by users can be received by any user on the network. However, there are certain conditions for this reception. The physical address of the receiving device must be the same as the destination address of the data packet before it can be received. For some specific systems, such as one-way communication systems that support broadcasting, such as one-way satellite systems or one-way cable television systems, users cannot send data at all, and therefore cannot form a local area network. In addition, for some systems that do not support broadcasting, such as telephone dial-up access to the Internet, although two-way communication is supported, it does not support broadcasting agreement, and it is not possible to implement a local area network.

In order to solve the above problems, an object of the present invention is to provide a simple two-way communication method in a non-localized or unidirectional communication system, that is, a method of externally interacting virtual local area network communication. A medium on which a local area network cannot be directly implemented, thereby simplifying the network structure and supporting all protocols of the local area network.

In order to achieve the purpose of the present invention, the present invention proposes a method for externally interacting virtual local area network communication to propagate data between a master station and a user terminal. The method is as follows:

Set a one-way physical or logical channel between the master station and the user terminal as a virtual local area network; set up a two-way physical or logical channel between the master station and the user terminal as an external interaction network; when the external interaction network is a In the local area network, the user terminal transmits standard local area network physical frames and physical address broadcast frames through the external interactive network; and the master station sends standard local area network physical frames on the virtual local area network according to the user terminal physical address;

When the external interactive network is a wide area network or the Internet, if the client is a stand-alone machine, the client sends the IP address and physical address of the site through the external interactive network into an IP packet to the designated replacement page (Detail ¹ Rule 26) A certain machine (usually the originating machine) forms an IP physical address comparison table; if the client is a local area network, a microcomputer on the client side sends the physical addresses and IP addresses of all microcomputers in the entire LAN into an IP packet and sends it to the form of an IP packet. A specific machine (usually the originating machine) specified on the LAN of the master station forms the IP physical address comparison table.

With the method of the present invention, the data communication steps between the master station and the user terminal are as follows:

The master station sends the physical LAN frame to the client based on the physical address of the client (such as MAC address, ID number, and other unique addresses of the receiving device). The client receives the physical frame of the LAN:

When the external interaction network set between the master station and the client is a local area network, a sending software simulation and conversion program is installed on the user-side data receiving device, and the feedback data is sent to the host through the external interaction network in the form of a physical frame on the LAN. The station side; and installing a receiving software simulation and conversion program on the main station data transmitting equipment and other equipment, and simulating the receiving equipment to receive the return data of the external interaction network:

When the external interaction network set between the master station and the client is a wide area network or the Internet, install sending software simulation and conversion programs on the user-side data receiving equipment, and send the feedback data into the form of IP packets and send it through the external interaction network. To the master station side; and installing a receiving software simulation and conversion program on the master station data sending device and other devices to simulate the receiving device to receive the return IP packets of the external interaction network.

The principle of the present invention is to use external interaction technology to divide data transmission and reception into two channels, use a one-way physical or logical channel for downlink reception, and set a two-way physical or logical channel for uplink transmission. A software simulation and conversion program is installed in the system, and a local area network physical frame or an IP packet is transmitted through an external interactive network channel to construct a virtual local area network. The invention will be further described with reference to the drawings:

Figure 1 is a schematic diagram of the method of the present invention;

Figure 2 is a schematic diagram of the process of sending data to the master station;

Figure 3 is a schematic diagram of the process of receiving data by the client;

Figure 4 is a schematic diagram of satellite communication system using external interactive virtual local area network method for network communication.

Figure 5 is a schematic diagram of the data flow of the interactive local area network outside the one-way satellite communication system.

FIG. 6 is a schematic diagram of the method of the present invention when the user terminal is a local area network. As shown in FIG. 1, the external interactive virtual local area network communication method is implemented by the following steps: A unidirectional physical or logical channel is set between the master station (1) and the user terminal (2) as a virtual local area replacement page ( ² Article 26) Set another two-way physical or logical channel between the master station (1) and the client (2) as the external interaction network

(3);

The user terminal transmits standard LAN physical frames and physical address broadcast frames or IP packets through the external interaction network (5).

The master station (1) sends standard LAN physical frames on the virtual local area network (4) according to the physical address of the client;

The above-mentioned virtual local area network (4) may be a channel in a one-way satellite communication system, a one-way cable television system, or the like. The above-mentioned external interaction network (3) may be a local area network, a wide area network, or a standard two-way external network such as the Internet. The external interactive network (3) is provided with a foreign interactive network transmitter (8) and a foreign interactive network receiver (7) correspondingly installed at the master station (1) and the client (2). The SIP sender and diplomatic SIP receiver can be network cards or network equipment such as modems.

As shown in Figures 2 and 3, it is a schematic diagram of the process of sending and receiving data for the master station (1) and the client (2). The process of sending data from the master station (1) is roughly as follows: Data from other network channels and external interactive networks enter the software simulation and conversion program of the master station, and first check whether it contains data of the physical frame or IP packet of the local area network, such as physical frame data. , Send to "Judge whether the physical frame should be sent?" If not, further check whether the received IP packet is legal, if not, discard the data packet. If it is legal, the IP packet enters the "send software simulation module", "converts to physical frame data", "determines whether the physical frame can be sent?", If it can be sent, the master station (1) is in the virtual local area network (4) According to the physical address of the client (such as MAC address, ID number and other unique address of the receiving device), the physical frame of the local area network is sent to the client and sent to the "unidirectional communication device". If not, the physical frame data is discarded. The process of receiving data by the client is roughly as follows: The client sends response data and other data, installs a software simulation and conversion program on the client (2) data receiving device (10), "determines whether the external interactive network is a local area network or a wide area network" If it is a local area network, it will be "packed according to the physical frame format of the local area network" and then sent to the master station through the "interactive interactive network". .

As shown in Figure 4, it is a schematic diagram of network communication using the external interactive virtual local area network method for a one-way satellite communication system.

Figure 5 shows a schematic diagram of the external interactive virtual local area network data flow of the one-way satellite communication system. The data transmission steps are as follows:

The master station (1) sends the LAN physical frame to the user end on the virtual local area network (4) according to the local area network standard. (Replacement Article 26) That is, the application data is converted into IP packets through the TCP / UDP module and the IP module and sent to the one-way data sending device (9). The one-way data sending device (9) packs the IP data into a physical frame of the local area network and sends it through the sending port. Sent to the unidirectional physical channel (4) of the virtual local area network (11);

The user terminal (2) receives the physical frame data of the local area network;

The sending software emulation and conversion program is installed on the data receiving device (10) on the client (2). When the client sends data, the client application sends the data to an IP packet through the TCP / UDP module and the IP module. The user-side unidirectional data receiving device (10) determines whether the external interactive network is a local area network or a wide area network. If it is a local area network, software simulation and conversion programs installed in the unidirectional data receiving device (10) convert the data into physical frames of the local area network, and The TCP / IP data header is added to the external interactive network receiver of the master station through the external interactive network (3); if it is a WAN or the Internet, the one-way data receiving device (10) directly converts the IP packet into the TCP / IP format Sent to the external interaction network (3), and transmitted to the receiver of the external interaction network.

Install the receiving software simulation and conversion program on the master station data transmitting device (9) to simulate the receiving device to receive the above-mentioned LAN physical frame or IP packet; when the master station receives the data, the external interactive receiver of the master station (1) confirms This data is a LAN physical frame or IP packet, which is transmitted to the software emulation and conversion program in the unidirectional data sending device, and then reaches the master application program through its IP layer and TCP layer.

The sending of the physical frame of the virtual local area network is realized through the virtual local area network (4), and the receiving is realized through the external interactive network (3).

FIG. 6 is a schematic diagram of the method of the present invention when the client is a local area network. If the client is a local area network, a microcomputer on the client side sends the physical addresses and IP addresses of all the microcomputers in the entire LAN into an IP packet and sends it to a specified machine (usually the originating machine) on the host LAN to form an IP Physical address comparison table.

The invention breaks through the various limitations of the traditional local area network on the actual communication medium, thereby breaking the pattern of one-way and two-way isolation in the traditional communication system, combining the two organically to achieve resource sharing; the invention transforms The existing one-way network makes it a complete external interaction network, which conveniently solves the interworking network problems of various non-interactive interactive systems. It can be applied to one-way satellite communication networks and one-way cable television networks, and it can also be used in On a two-way communication network, the present invention fully and transparently supports a variety of local area network protocols, and supports various local area network application software.

Replace page

Rule ²⁶ )

Claims

Claim

1. An external interactive virtual local area network network communication method, in which the master station (1) sends data and the client (2) receives data, which is characterized by:

a. Set a unidirectional physical or logical channel between the master station (1) and the user terminal (2) as a virtual local area network (4);

b. Set up another two-way physical or logical channel between the master station (1) and the client (2) as the external interaction network (3).

2. The method for externally interacting virtual local area network communication according to claim 1, when the diplomatic Internet is a local area network, the method is:

a. The client transmits standard LAN physical frames and physical address broadcast frames through the external interaction network (3);

b. The master station (1) sends standard LAN physical frames on the virtual local area network (4) according to the physical address of the client.

3. A method for communicating with a foreign interactive virtual local area network according to claim 1, when the external interactive network is a wide area network or the Internet, characterized in that: if the user terminal is a stand-alone machine, the user terminal transmits the message through the foreign language internet network (3) The IP address and physical address of this station are transmitted as an IP packet to a specified machine (usually the originating machine) on the LAN of the master station to form an IP physical address comparison table.

4. An external interactive virtual local area network network communication method according to claim 1 or 3, characterized in that: if the user terminal is a local area network, a microcomputer on the user terminal physically addresses and IP addresses of all microcomputers in the entire local area network The IP packet is transmitted to a specified machine (usually the originating machine) on the LAN of the master station to form an IP physical address comparison table.

5. The method for externally interacting virtual local area network communication according to claim 1, characterized in that the data communication steps between the master station (1) and the user terminal (2) are as follows:

a. The master station (1) sends the physical LAN frame to the client on the virtual local area network (4) according to the client's physical address (such as MAC address, ID number and other receiving device-specific addresses);

b. The client (2) receives the physical frame of the LAN.

6. The method for communicating with a foreign interactive virtual local area network according to claims 1 and 3, when the foreign diplomatic network is a local area network, which is characterized in that:

a. Install the sending software simulation and conversion program on the user terminal (2) data receiving device (10), and send the feedback data to the master station through the external interactive network (3) in the form of a physical frame on the local area network: Article 26) b. Install the receiving software simulation and conversion program on the master data transmitting equipment (9) and other equipment. The analog receiving device is used for receiving the return data of the external interaction network.

7. The method for communicating with an external interactive virtual local area network according to claims 1 and 3, when the external interactive network is a wide area network or the Internet, characterized in that the data communication steps between the master station (1) and the user terminal (2) are as follows :

a. Send a software simulation and conversion program on the user terminal (2) data receiving device (10), send the feedback data in the form of IP packets and send it to the host station through the external interaction network (3);

b. Install the receiving software simulation and conversion program on the master data sending device (9) and other devices to simulate the receiving device to receive the return IP packets from the external interactive network.

8. The method for communicating with an external interactive virtual local area network according to claim 1, characterized in that the external interactive network (3) can be constituted by a local area network.

9. The method for communicating with an external interactive virtual local area network according to claim 1, characterized in that the external interactive network (3) can also be constituted by a wide area network or the Internet.

Replacement page ( ⁶ Article 26)