KR20040005293A - SUBSCRIBER APPARATUS FOR SUPPORTING LAN AND xDSL SIMULTANEOUSLY AND ITS CONTROL METHOD - Google Patents

Abstract

PURPOSE: A subscriber device simultaneously supporting an LAN(Local Area Network) and an xDSL service and a control method thereof are provided to process a signal received through a telephone line, thereby constructing the LAN for Internet access at low price by using an existing digital subscriber line. CONSTITUTION: An ADC(202) converts an analog signal into digital data. A DMT(Discrete Multi Tone) receiver(204) demodulates the digital data, and outputs the demodulated digital data. An ATM processor(205) assembles the DMT-demodulated signal into an ATM packet, and outputs the ATM packet. A TCP/IP processor(206) converts the ATM packet into an IP packet, confirms a destination terminal by analyzing a header of the IP packet, transmits the IP packet to an input/output interface(207), and transmits the IP packet to an MAC processor(208) if a terminal is connected with a wireless LAN. The input/output interface(207) transmits the IP packet to the destination terminal. The MAC processor(208) converts the IP packet, and outputs the converted packet. A baseband signal processor(209) codes/interleaves an MAC frame, and outputs symbol data. A modulator/demodulator(210) modulates the symbol data, and outputs a baseband analog signal. An RF unit(211) converts the baseband analog signal into an RF signal, and transmits the RF signal.

Description

Subscriber device and control method for supporting local area network and digital subscriber line service at the same time {SUBSCRIBER APPARATUS FOR SUPPORTING LAN AND xDSL SIMULTANEOUSLY AND ITS CONTROL METHOD}

The present invention relates to an internet access subscriber device and method, and more particularly, to an apparatus and method for simultaneously supporting a local area network (LAN) and a digital subscriber line service in a subscriber device.

In general, xDSL devices (or digital subscriber line devices) such as Asymmetric Digital Subscriber Line (ADSL), High-speed Digital Subscriber Line (HDSL), SDSL9Symmetric Digital Subscriber Line (SDSL), and Very High Speed Digital Subscriber Line (VDSL) It is a transmission equipment that enables two-way high-speed data service between high-speed data network and subscriber by using frequency band higher than voice signal frequency band by using existing public switched telephone network (PSTN).

However, these digital subscriber line devices are mainly targeted to a single home PC, and users can access the Internet through a plurality of terminals (eg, PCs, laptops, etc.) installed in their homes (or offices). In order to perform multimedia service, separate LAN networks (wired LAN and wireless LAN) must be installed, and therefore, xDSL network equipment as well as separate network equipment such as hub and router equipment must be provided.

On the other hand, wireless LAN is a communication network that uses electromagnetic waves from access point (AP) equipment to terminal equipment instead of laying a wire in a home (or office). The advantage is that the network can be built relatively quickly. It also has the advantage of being able to communicate on the go using laptops and PC cards without staying in a fixed desktop environment.

As the number of users on the Internet has soared, the installation of xDSL has rapidly increased in order to use it in homes and small offices. In addition, due to the advantages of the aforementioned WLAN, the requirement to use the Internet while moving by using wireless in the home or small office is increasing. However, in order to use these two communication networks (xDSL and wireless LAN), as described above, not only xDSL network equipment but also separate network equipment must be separately installed, which not only increases the economic burden but also increases the efficiency and efficiency in network construction. There is a problem of poor scalability.

Accordingly, an object of the present invention is to provide an apparatus and method for simultaneously supporting a local area network (LAN) and a digital subscriber line service in an internet access subscriber device.

According to a first aspect of the present invention for achieving the above object, a subscriber device for simultaneously supporting a wired / wireless local area network (LAN) and a digital subscriber line (xDSL) service for processing a signal received through a telephone line The apparatus includes: an analog to digital converter (ADC) for converting an analog signal received through a telephone line into digital data; a DMT receiver for demodulating and outputting the digital data from the ADC; An ATM processor for assembling and outputting the DMT demodulated signal from a receiver into an ATM packet, converting the ATM packet from the ATM processor into an IP packet, analyzing a header of the IP packet, and identifying a destination terminal; If the destination terminal is a terminal connected with a wired LAN, the IP packet is transmitted to an input / output interface, and the terminal is connected with a wireless LAN. A TCP / IP processing unit for delivering the IP packet to a MAC processing unit, the input / output interface unit for transferring the IP packet from the TCP / IP processing unit to the destination terminal via a cable, and the TCP / IP processing unit The MAC processor for converting and outputting an IP packet into a MAC frame according to a predetermined WLAN standard, a baseband signal processor for coding and interleaving the MAC frame from the MAC processor, and outputting symbol data, and the baseband signal processor And a modulator demodulating the symbol data from the modulator to output a baseband analog signal, and an RF unit converting the baseband analog signal from the modulator and converting the baseband analog signal into a high frequency signal.

According to a second aspect of the present invention, a method for processing a signal received through a telephone line in a subscriber device for simultaneously supporting a wired / wireless local area network (LAN) and a digital subscriber line (xDSL) service is provided. Converting the analog signal received through the digital data, demodulating the digital data into DMT (Discrete Multi Tone), assembling the DMT demodulated signal into an ATM packet, and converting the ATM packet into an IP packet. Converting, analyzing a header of the IP packet to identify a destination terminal, transmitting the IP packet to a corresponding terminal connected by a cable when the destination terminal is a wired LAN; Converting the IP packet into a MAC frame according to a predetermined WLAN standard when the terminal is connected to the wireless LAN; Coding and interleaving a frame to generate symbol data, modulating the symbol data to generate a baseband analog signal, and converting the baseband analog signal into a high frequency signal and transmitting the same through an antenna. It is characterized by.

1 is a diagram showing the configuration of a network built in a home according to an embodiment of the present invention.

2 is a diagram showing a detailed configuration of the subscriber apparatus 100 of FIG.

3 is a diagram illustrating a procedure for processing an ADSL signal (IP packet) received through a telephone line according to an embodiment of the present invention.

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

100: subscriber device 110 to 113: terminal

200: analog transmitter and receiver 201: DAC

202: ADC 203: DMT transmitter

204: DMT receiver 205: ATM processor

206: TCP / IP processing unit 207: I / O interface unit

208: MAC processing unit 209: baseband signal processing unit

210: variation demodulation unit 211: RF unit

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention will be described with respect to a device for matching a digital subscriber line (xDSL) and a local area network (wired LAN and wireless LAN) capable of internet access. This device basically supports both wired and wireless LAN. For example, desktops (PCs) and home appliances (fridges, washing machines, air conditioners, etc.) are wired and laptops are wired or / and wireless. That is, the present invention enables the home device to remotely control the home device using the Internet, and a portable device such as a notebook allows the user to use the Internet wirelessly.

1 illustrates a configuration of a network built in a home according to an exemplary embodiment of the present invention. As described above, the digital subscriber line has a number of specifications, but the following description will be given by taking an example of an asymmetric digital subscriber line (ADSL).

As shown, the indoor network includes a subscriber device 100 for matching an asymmetric digital subscriber line and a local area network, and a plurality of terminals 110 to 113. Here, the subscriber device includes an ADSL signal processor for processing and matching the ADSL signal received through the telephone line to the wired LAN, and a WLAN signal processor for matching to the WLAN. The plurality of terminals 110 to 113 may be, for example, a desktop (PC), a notebook (note-book), and a household device (eg, a refrigerator). Here, the desktop and the home device are connected to the subscriber device by a cable to perform wired communication, and a portable device such as a notebook computer performs wireless communication through wireless as well as the wired communication. In the case of wireless communication, the device (for example, a laptop) is provided with a predetermined wireless LAN card so as to communicate signals according to the wireless LAN standard. However, considering the wiring problem, the desktop or the home appliance may also be connected and used wirelessly. Of course, in order to connect wirelessly, the wireless LAN card must be installed in the device.

2 illustrates a detailed configuration of the subscriber apparatus 100 of FIG.

As shown, the ADSL processor of the subscriber device 100 includes an analog transmitter / receiver 200, a digital to analog converter (DAC) 201, an analog to digital converter (ADC) 202, and a discrete multi-tone (DMT) transmitter. 203, DMT receiving unit 204, ATM processing unit 205, TCP / IP processing unit 206, and input / output interface unit 207 are configured. In addition, the wireless LAN signal processing unit of the subscriber device 100, the MAC (Media Access Control) processing unit 208, the baseband signal processing unit 209, the modulation and demodulation unit 210, RF (Radio Frequency) unit ( 213).

Referring to the operation according to the configuration of Figure 2 as follows.

First, referring to the reception process, the analog transceiver 200 outputs a channel filtered signal received through the telephone line. The ADC 202 converts the channel filtered signal from the analog transceiver 200 into digital data and outputs the digital data. The DMT receiver 204 demodulates and outputs the digital data from the ADC 202 by DMT (Discrete Multi Tone). The ATM processing unit 205 assembles and outputs the DMT demodulated data from the DMT receiving unit 204 into an ATM packet. The TCP / IP processing unit 206 converts the ATM packet from the ATM packet processing unit 205 into a transmission control protocol-internet protocol (TCP / IP) or point-to-point protocol (PPP) packet. It analyzes the header information (IP address) of the packet and searches the database to determine the destination terminal. If the destination is a wired terminal (or device), the TCP / IP packet is transmitted to the input / output interface 207, and in the case of a wirelessly connected terminal, the TCP / IP packet is transmitted to the MAC processing unit 208. Of course, the correspondence between the physical address (eg, MAC address) of the device and the IP address, and information on whether the wired or wireless connection is managed in a database (not shown). The input / output interface unit 207 loads the packet from the TCP / IP packet processing unit 206 on a predetermined bus and transmits the packet to a terminal to which the corresponding IP address is assigned. This shows the operation when the received packet is delivered to the wired terminal.

Referring to an operation when a received packet is delivered to a wirelessly connected terminal, the MAC processing unit 208 transmits the TCP / IP packet from the TCP / IP processing unit 206 according to a wireless LAN standard (eg, IEEE 802.11). Convert to MAC frame and output. The baseband signal processor 209 outputs symbol data by coding and interleaving the MAC frame from the MAC processor 208. The modulator 210 modulates and outputs the symbol data from the baseband signal processor 209 in a predetermined manner. Here, the symbol data is modulated in a manner such as time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), or the like so that a plurality of terminals performing wireless communication can communicate without collision. For example, in the case of the CDMA system, the symbol data is modulated by Quadrature Phase Shift Keying (QPSK), and spread by a predetermined orthogonal code (Walsh or PN code) to generate an analog baseband signal. The RF unit 211 converts the analog baseband signal from the modulation and demodulation unit 210 into a high frequency signal and transmits the same through an antenna.

Next, referring to the transmission process, the input / output interface unit 207 receives a TCP / IP packet from a device connected with a cable and delivers the TCP / IP packet to the TCP / IP processing unit 206. The TCP / IP packet processing unit 206 analyzes the TCP / IP packet from the input / output interface unit 207, performs predetermined control, and outputs the TCP / IP packet to the ATM processing unit 205. Here, update the database if necessary. The ATM processing unit 205 assembles and outputs the TCP / IP packet from the TCP / IP processing unit 206 into an ATM packet. For example, the ATM processing unit 304 uses ALL5 as an ATM adaptation layer (ALL). The DMT transmitter 203 generates Discrete Multi Tone (DMT) modulated ATM packets from the ATM processor 205 to generate a sequence of bits. The DAC 201 converts the string of bits from the DMT transmitter 203 into an analog signal and outputs the analog signal. The analog transmitter / receiver 200 performs channel filtering on the analog signal from the DAC 201 and transmits the same through a telephone line. The above is an operation when transmitting a signal from a wired terminal.

Referring to an operation when transmitting a signal from a wirelessly connected terminal, the RF unit 211 converts a high frequency signal received through the antenna into an analog baseband signal and outputs the converted signal. The demodulation unit 210 demodulates the analog baseband signal from the RF unit 211 to generate a baseband digital signal. For example, in the case of the CDMA scheme, symbol data is generated by despreading and demodulating (QPSK demodulation) the analog baseband signal. The baseband signal processor 209 deinterleaves and decodes the digital signal from the modulator 210 to generate an original information string (MAC frame). The MAC processing unit 208 analyzes the information string (MAC frame) from the baseband signal processing unit 209 to perform predetermined control, and transfers the MAC frame to the TCP / IP processing unit 206. The TCP / IP processing unit 206 converts the MAC frame from the MAC processing unit 208 into an IP packet and outputs the MAC frame to the ATM processing unit 205. Operations after the TCP / IP processing unit 206 are the same as described above and will be omitted.

As can be seen here, the TCP / IP processing unit 206 processes the packets coming from the lower layer (physical layer: input / output interface, MAC processing unit) in the same manner as known. However, for packets received through a telephone line, different processing is performed by distinguishing whether a destination is a wired terminal or a wirelessly connected terminal. Looking at it in detail as follows.

3 illustrates a procedure for processing an ADSL signal (IP packet) received through a telephone line according to an exemplary embodiment of the present invention. Since a known technique is used until the IP packet is received by the TCP / IP processing unit 206, the algorithm described below will be described after the processing of the IP packet.

Referring to FIG. 3, the TCP / IP processor 206 first checks whether a TCP / IP packet is received from the ATM processor 205 in step 301. If the TCP / IP packet is received, the TCP / IP processing unit 206 proceeds to step 303 to analyze the header information of the received TCP / IP packet to confirm the destination IP address and to search the database for the IP. Check the device to which the address is assigned. As mentioned above, the database stores information on the correspondence between the physical address (eg, MAC address) and the IP address of the device and whether it is wired or wireless.

In operation 305, the TCP / IP processing unit 206 checks whether the terminal having the destination IP address is a wirelessly connected terminal. If the destination is a wirelessly connected terminal, the TCP / IP processing unit 206 proceeds to step 307, and if the destination is a wired terminal, proceeds to step 313 to transfer the received TCP / IP packet to the input / output interface unit 207. Through the transmission to the corresponding terminal assigned the IP address.

On the other hand, when the destination is a wirelessly connected terminal, the TCP / IP processing unit 206 converts the received TCP / IP packet into the MAC processing unit to convert the received TCP / IP packet into a signal conforming to a predetermined WLAN standard. 208). In step 307, the MAC processing unit 208 converts the TCP / IP packet into a MAC (Media Access Control) frame according to the WLAN standard. Thereafter, in step 309, the MAC frame is coded and modulated to be converted into a predetermined wireless signal, and in step 311, the wireless signal is transmitted through an antenna.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

As described above, the present invention proposes a device for matching a digital subscriber line (xDSL) and a wireless LAN (wireless LAN) using a telephone line, thereby enabling Internet access at a small office or home using an existing digital subscriber line. There is an advantage that it is possible to build a LAN (wired LAN and wireless LAN) possible at a low cost. In addition, when establishing a wireless LAN, there is no telephone line and network line in the office, so it can create a pleasant environment.There is no need to install the line and telephone when moving the location in the office. There is no need to provide cost savings and convenience.

Claims (5)

An apparatus for processing a signal received through a telephone line in a subscriber device for simultaneously supporting a wired / wireless local area network (LAN) and a digital subscriber line (xDSL) service. An analog to digital converter (ADC) for converting analog signals received through telephone lines into digital data; A DMT receiver for demodulating and outputting the digital data from the ADC (DMT); An ATM processor for assembling and outputting the DMT demodulated signal from the DMT receiver into an ATM packet; Converting the ATM packet from the ATM processor into an IP packet, analyzing a header of the IP packet to identify a destination terminal, and delivering the IP packet to an input / output interface when the destination terminal is a terminal connected to a wired LAN; TCP / IP processing unit for transmitting the IP packet to the MAC processing unit in the case of a terminal connected by a wireless LAN, The input / output interface unit for transferring the IP packet from the TCP / IP processing unit to the destination terminal through a cable; The MAC processor for converting the IP packet from the TCP / IP processor into a MAC frame according to a predetermined WLAN standard and outputting the MAC frame; A baseband signal processor for coding and interleaving the MAC frame from the MAC processor to output symbol data; A modulator for modulating the symbol data from the baseband signal processor and outputting a baseband analog signal; And an RF unit converting the baseband analog signal from the modulation and demodulation unit into a high frequency signal and transmitting the same through an antenna. An apparatus for processing a signal received through a telephone line in a subscriber device for simultaneously supporting a wireless local area network (WLAN) and a digital subscriber line (xDSL) service, An analog to digital converter (ADC) for converting analog signals received through telephone lines into digital data; A DMT receiver for demodulating and outputting the digital data from the ADC (DMT); An ATM processor for assembling and outputting the DMT demodulated signal from the DMT receiver into an ATM packet; A TCP / IP processing unit which converts the ATM packet from the ATM processing unit into an IP packet and outputs the converted IP packet; The MAC processor for converting the IP packet from the TCP / IP processor into a MAC frame according to a predetermined WLAN standard and outputting the MAC frame; A baseband signal processor for coding and interleaving the MAC frame from the MAC processor to output symbol data; A modulator for modulating the symbol data from the baseband signal processor and outputting a baseband analog signal; And an RF unit converting the baseband analog signal from the modulation and demodulation unit into a high frequency signal and transmitting the same through an antenna. An apparatus for processing signals transmitted over a telephone line in a subscriber device for simultaneously supporting a wired / wireless local area network (LAN) and a digital subscriber line (xDSL) service. A WLAN signal processor for analyzing a MAC frame from a terminal connected through a WLAN and performing predetermined control and outputting the MAC frame to a TCP / IP processor; Assembling the MAC frame from the WLAN signal processor into an IP packet and outputting the MAC packet to an ATM processor, and analyzing the IP packet from a terminal connected through a wired LAN to perform a predetermined control, and then outputting the IP packet to the ATM processor. / IP processing unit, An ATM processor for assembling and outputting the IP packet from the TCP / IP processor into an ATM packet; A DMT transmitter which modulates and outputs the ATM packet from the ATM processor; And a digital to analog conveter (DAC) for converting and transmitting the DMT-modulated data from the DMT transmitter into an analog signal. The method of claim 3, wherein the WLAN signal processing unit, An RF unit for converting a high frequency signal received through an antenna into a baseband analog signal, A demodulation unit for demodulating the baseband analog signal from the RF unit and converting the baseband analog signal into a baseband digital signal; A baseband signal processor for decoding the baseband digital signal from the modulation and demodulator to generate a MAC frame; And a MAC processor for analyzing the MAC frame from the baseband signal processor to perform predetermined control and outputting the MAC frame to the TCP / IP processor. A method for processing a signal received through a telephone line in a subscriber device for simultaneously supporting a wired / wireless local area network (LAN) and a digital subscriber line (xDSL) service, Converting analog signals received through telephone lines into digital data; Demodulating the digital data by DMT (Discrete Multi Tone); Assembling the DMT demodulated signal into an ATM packet; Converting the ATM packet into an IP packet; Analyzing a header of the IP packet to identify a destination terminal; Transmitting the IP packet to a corresponding terminal connected by a cable when the destination terminal is a terminal connected through a wired LAN; Converting the IP packet into a MAC frame according to a predetermined wireless LAN standard when the destination terminal is a wireless LAN connected terminal; Coding and interleaving the MAC frame to generate symbol data; Generating a baseband analog signal by modulating the symbol data; Converting the baseband analog signal into a high frequency signal and transmitting the same through an antenna.