KR20030003394A - Apparatus and method for wireless and wireline data access using digital subscriber line access multiplexer - Google Patents

Abstract

PURPOSE: A data connection device using a DSLAM(Digital Subscriber Line Access Multiplexer) is provided to mount a WTU(Wireless Telecommunications Unit) of a telephone office connected to an RAU(Remote Antenna Unit) through an optical cable in the existing DSLAM providing a subscriber with a wire-line DSL, to give services of NIU(Network Interface Unit) and wireless DSL, so that a problem of shadow areas is solved and the mobility in a service area is secured. CONSTITUTION: An existing DSLAM(10) provides services of a wire-line DSL to a subscriber. A WTU of a telephone office is mounted in the DSLAM(10). An RAU(32) decides an area of a wireless DSL service, and connects with the WTU of the telephone office through an optical cable. Also, the RAU(32) provides wireless connection of a subscriber terminal. And an NIU(33) of a subscriber is located within a service area of the RAU(32) and wirelessly connects with the RAU(32) to provide the subscriber terminal with the wireless DSL service. The RAU(32) decides the coverage of the wireless DSL service, converts optical signals from the WTU(31) into wireless frequency signals for transmission through an antenna, and converts wireless frequency signals received through the antenna into optical signals for delivering the signals to the WTU(31).

Description

Data access device using digital subscriber line matching multiplexer {Apparatus and method for wireless and wireline data access using digital subscriber line access multiplexer}

The present invention relates to a data access device using a digital subscriber line matching multiplexer, and more particularly, to a remote antenna device (DSLAM) in a digital subscriber line matching multiplexer (DSLAM) that provides a wire-line DSL. RTU) and optical fiber telephone side wireless modem unit (WTU) are installed to provide mobility and portability with subscriber side wireless modem unit (NIU) while solving the shadow area problem of conventional asymmetric digital subscriber line (xDSL). It is to provide wireless DSL service.

1 is a block diagram of a conventional digital subscriber line matching multiplexer (DSLAM), where "10" is a digital subscriber line matching multiplexer (DSLAM), "11" is a network termination unit (NT), and "12" is a multiplexer ( MUX), "13" denotes a telephone station side modem unit (xTU-C), and "21" denotes a subscriber side modem unit (xTU-R).

As shown in FIG. 1, a conventional digital subscriber line matching multiplexer (DSLAM) 10 is a subscriber network system that provides high-speed data access to subscribers in a telephone station, and is connected to a subscriber side modem unit (xTU-R) 21. A telephone station modem unit (xTU-C) 13 to be connected, a multiplexer (MUX) 12 for multiplexing traffic between a telephone station modem unit (xTU-C) 13 and a network, and an interface with a network It is composed of a network termination unit (NT) 11 in charge, and provides a wire-line DSL service.

The telephone station side modem unit (xTU-C) 13 is connected to the subscriber side modem unit (xTU-R) 21 in a double copper line.

The network termination unit (NT) 11 is responsible for an interface between the telephone station side modem unit (xTU-C) 13 and the network.

However, since the data access service provided to the subscriber in the conventional digital subscriber line matching multiplexer (DSLAM) 10 depends on the dual copper line, the poor quality area and the unserviceable shadow area are generated when the service is provided.

There are a few ways to solve this problem.

The first is to combine optical transmission with coaxial or biaxial transmission (eg, FTTC, HFC).

Second, it is to combine a dedicated line (for example, T1 / E1) and biaxial copper transmission.

Third, combining a dedicated line (eg, T1 / E1) with wireless transmission.

Fourth, to combine optical transmission and wireless transmission (eg, HFR).

The above methods can solve the problems of the conventional DSLAM because they are connected to the area around the subscriber by optical transmission or leased line, but high cost is required due to the optical transmission device or the leased line and auxiliary devices. Here, since the first and second methods are wired to the subscriber-side modem unit as in the DSLAM, it is difficult to provide portability and mobility of the subscriber station. In contrast, since the third and fourth methods are wirelessly connected to the subscriber-side modem unit, there is an advantage in that mobility and portability are provided in the area of the system providing the same.

In the subscriber's point of view, the optical transmission or leased line is connected from the telephone station to the subscriber's area to ensure high-speed data quality without quality defects and shadow areas, and to provide portability and mobility in data access with the subscriber terminal. However, from the point of view of the service provider, it is difficult to adopt the above four methods to solve the problem of the conventional DSLAM since the service provision cost is increased in proportion to the service quality requirements and the construction cost.

In summary, since the wire-line DSL service provided to the subscriber side in the conventional DSLAM relies on a dual copper line, a poor quality area and a shaded area that cannot be serviced in the subscriber are generated.

As a solution to this problem, there is a method of connecting an optical cable or leased line to the area near the subscriber, but this method increases the investment cost to the service provider and eventually increases the cost of providing the service to the subscriber. there was.

SUMMARY OF THE INVENTION The present invention has been proposed to meet the above requirements, and is provided with a telephone station-side wireless modem connected to a remote antenna unit (RAU) and an optical cable to an existing DSLAM that provides a wire-line DSL to subscribers. Wireless Data Access (WTU) is installed to provide Wireless DSL service with Subscriber's Wireless Modem Unit (NIU) to solve the problem of shadow area occurrence and to ensure mobility within the service area. The purpose is to provide a device.

1 is a block diagram of a conventional digital subscriber line matching multiplexer (DSLAM).

2 is a configuration diagram of an embodiment of a data connection device according to the present invention;

3 is a detailed configuration diagram of an embodiment of a data connection device according to the present invention;

* Explanation of symbols for the main parts of the drawings

10: Digital subscriber line matching multiplexer (DSLAM)

20: Wire-line DSL

30: Wireless Data Connection (Wireless DSL)

In order to achieve the above object, the present invention provides a wireless data access device in a subscriber network system, comprising: a known digital subscriber line matching device for providing a wire-line DSL service to a subscriber side; Telephone station side wireless communication means mounted to the digital subscriber line matching device for a wireless DSL service; Wireless connection means for determining a wireless DSL service area, connected to the telephone station side wireless communication means with an optical cable, and providing a wireless connection of a subscriber station; And a subscriber side wireless communication means located in a service area of the wireless access means and wirelessly connecting with the wireless access means to provide a wireless DSL service to the subscriber terminal.

The present invention provides a subscriber station wireless modem unit (WTU) by mounting a remote antenna unit (RAU) and a telephone station side wireless modem unit (WTU) connected by an optical cable to an existing DSLAM that provides a wireline DSL. With the structure of providing a wireless DSL together with the NIU, it is possible to provide the mobility and portability of the subscriber station and to expand the service receiving area within the telephone station, while solving the conventional problems.

To this end, the present invention is to propose a method of mounting a wireless modem unit (WTU) in the existing DSLAM system, and from the wireless modem unit (WTU) to the remote antenna unit (RAU) by HFR transmission technology. By doing so, DSLAM provides traditional wire-line DSL services while providing wireless DSL services that have the advantage of addressing shadowing issues and ensuring mobility and portability. In addition, it can be provided using the network interworking and operation maintenance system of existing DSLAM system.

Through this, the present invention can be used in a subscriber network system that provides a high speed data access service.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram of an embodiment of a data connection device according to the present invention, where “20” is a wire-line DSL, “30” is a wireless DSL, and “31” is a diagram. A telephone station side wireless modem unit (WTU), "32" represents a remote antenna unit (RAU), and "33" represents a subscriber side wireless modem unit (NIU), respectively.

A data connection device for providing a wire-line DSL service and a wireless DSL service according to the present invention is a conventional method of providing a wire-line DSL 20 to a subscriber. A telephone station-side wireless modem unit (WTU) 31 is mounted in a digital subscriber line matching multiplexer (DSLAM) 10 (see FIG. 1), and a telephone station-side wireless modem unit (WTU) 31 and a remote antenna unit (RAU) are installed. (32) is connected to the optical cable, and the Remote Antenna Unit (RAU) 32 and the Subscriber Side Modem Unit (NIU) 33 are connected wirelessly to provide a wireless DSL (30) service between the network and the subscriber. do.

As shown in FIG. 2, a data connection device providing a wired data connection (Wire-line DSL) service and a wireless data connection (Wireless DSL) service according to the present invention is a wireline data connection (Wire-line DSL) to the subscriber side. A conventional Digital Subscriber Line Matching Multiplexer (DSLAM) 10 (see FIG. 1) providing a service, and a conventional Digital Subscriber Line Matching Multiplexer (DSLAM) 10 (for Wireless DSL) service. A telephone station side wireless modem unit (WTU) 31 and a wireless DSL service area are determined, and are connected to the telephone station side wireless modem unit (WTU) 31 by an optical cable, It is located within the service area of the remote antenna unit (RAU) 32 and the remote antenna unit (RAU) 32, which provides wireless access of the subscriber station, and wirelessly connects to the remote antenna unit (RAU) 32. Data Connection (Wireless DSL) And a subscriber-side radio modem unit (NIU) (33) that provides a service to the subscriber terminal.

Here, the remote antenna unit (RAU) 32 determines the wireless DSL service coverage, is connected to the telephone station side wireless modem unit (WTU) with an optical cable, and is transmitted from the telephone station side wireless modem unit (WTU). The optical signal is converted into a radio frequency signal and transmitted through an antenna, and the radio frequency signal received through the antenna is converted into an optical signal and transmitted to the telephone station side wireless modem unit (WTU) 31.

3 is a detailed configuration diagram of an embodiment of a data access device according to the present invention, and is an example of applying a DSLAM based on an asynchronous transfer mode (ATM).

In the drawings, reference numeral "41" denotes an ATM cell bus, "42" denotes an xDSL modem block, "43,44" denotes an electrical / optical conversion block, "45,46" denotes a wireless modem function block, and "47" denotes a wireless medium. MAC control block, "48,49" is IF / RF conversion block, "50" is ATM block, "51" is terminal interface block, "52" is subscriber terminal, and "53" is original terminal function Represents a block.

In FIG. 3, the DSLAM 10 includes a network termination unit 11 that performs an interface and multiplexing function with a network side, and a subscriber side modem unit that provides a wire-line DSL 20 service to a subscriber side. A conventional DSLAM (see FIG. 1) with a (xTU-C) 21 is provided with a telephone station-side wireless modem unit (WTU) 31 which provides a wireless data connection (Wireless DSL) 30 service, ATM cell transfer between these units is via an ATM cell bus 41.

The network termination unit (NT) 11 is responsible for network side transmission and reception of all DSL traffic provided to subscribers through the DSLAM 10, and for this purpose, receives ATM traffic from each unit and transmits it to the network side or traffic received at the network side. ATM Bus I / F block for routing the network to the unit, ATM Mux block for multiplexing traffic between each unit and the network, and STM-1 connecting the unit to the network. A signal conversion (ATM PHY) block and a transmission control (TC) block for data transmission and reception on a physical medium.

The telephone station side modem unit (xTU-C) 13 is connected to the subscriber side modem unit (xTU-R) 21 in a bi-directional manner to provide a wire-line DSL service. ATM Bus I / F block for transmitting / receiving traffic of a wire-line DSL through the NT 11 and the ATM cell bus 41, and multiple transmission / reception of traffic between each unit and the network. It consists of an ATM multiplexer (ATM Mux) block and xDSL modem block 42. Here, the xDSL modem block is a multi-port integrated xDSL modem function unit (ATM TC, digital processing unit, modem) to accommodate multiple subscriber-side modem units (xTU-R) 21 to increase the mounting degree of DSLAM. (Wire modulation / demodulation), wire-line DSL traffic between the subscriber-side modem unit (xTU-R) 21 connected to the analog front-end (AFE) and the modem function of each port. It may be implemented with an ATM Bus I / F block that multiplexes to 42.

The telephone station side wireless modem unit (WTU) 31 is optically connected to the remote antenna unit (RAU) 32 to provide a wireless DSL service to the subscriber side wireless modem unit (NIU) 33. Perform the corresponding function.

The telephone station side wireless modem unit (WTU) 31 excludes the electrical / optical conversion blocks 43 and 44 for optical transmission in the telephone station side wireless modem unit (WTU) 31 and the remote antenna unit (RAU) 32. And the same wireless modem function block 45 as the subscriber-side wireless modem unit (NIU) 33, operating with minimal load on the remote antenna unit (RAU) 32 via optical relaying of radio signals over the optical cable. To reduce maintenance costs, most functions are performed except for the transmission and reception of RF signals.

In this embodiment, the telephone station-side wireless modem unit (WTU) 31 is an ATM bus interface for transmitting and receiving wireless DSL traffic through the network termination unit (NT) 11 and the ATM cell bus 41. ATM Bus I / F) block, a wireless modem function block 46 excluding the modem function of the remote antenna unit (RAU) 32 as described above, and an electric / optical conversion block 43 for optical transmission. Where the wireless modem function block 46, together with the subscriber-side wireless modem (NIU) 33, is a wireless MAC block 47 for wireless media access, a TC for wireless PHY function, baseband modulation / demodulation, IF band modulation / demodulation and IF / RF conversion are performed. Meanwhile, in the radio modem function block 46, the IF / RF conversion blocks 48 and 49 may be any one of the telephone station side wireless modem unit (WTU) 31 and the remote antenna unit (RAU) 32 as described above. Since it only works on both sides, it is determined by considering the device elements (optical cable, electrical / optical conversion block of each unit) relayed through the optical cable in both devices and the radio signal (IF or RF) relayed.

On the other hand, the telephone station-side wireless modem unit (WTU) 31 can accommodate a plurality of remote antenna units (RAUs) 32 to increase the degree of mounting of the wireless DSL provided to the subscriber side in the system. A multi-port integrated wireless modem function block (46), an ATM multiplexer (ATM Mux) block for multiplexing and transmitting the wireless DSL traffic provided through each modem function to the ATM cell bus 41; It may also be implemented as an electrical / optical conversion block that provides multicarrier electrical / optical transmission / reception for optical transmission between the telephone station side wireless modem unit (WTU) 31 and the multiple remote antenna unit (RAU) 32.

The remote antenna unit (RAU) 32 is located in the vicinity of the subscriber and provides an RF transmit / receive (antenna) block and an optional IF / RF conversion block 49 to provide wireless access to the subscriber side modem unit (NIU) 33. And an electrical / optical conversion block 44 which performs optical transmission with the telephone station-side wireless modem unit (WTU) 31 of the DSLAM 10.

The subscriber side wireless modem unit (NIU) 33 is a device located within the antenna area of the remote antenna unit (RAU) 32, and includes a wireless modem function block 45 and an ATM block 50 that performs ATM layer functions. It provides a terminal interface block 51 for providing ATM data to the subscriber terminal 52. The wireless subscriber station 52 incorporates a subscriber side wireless modem unit (NIU) 33 into the original terminal function block 53.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention can provide a wired data connection (Wire-line DSL) and a wireless data connection (Wireless DSL) service in the existing DSLAM, and accordingly, the conventional wire-line data connection (Wire-line) in terms of service DSL) can provide an alternative solution to the poor quality and shadow areas that occur in the provision, and can provide the mobility and portability of the subscriber station guaranteed by the wireless DSL, in providing The use of optical transmission for transmission has the effect of expanding the service receiving area within the telephone office.

In addition, since the present invention provides a structure for providing a wireless DSL using a DSLAM, since it is possible to interoperate with the existing network side, maintain and use the service system, it is effective as an economical and highly available connection structure. have.

Claims (5)

A data access device in a subscriber network system, A known digital subscriber line matching device for providing a wire-line DSL service to a subscriber side; Telephone station side wireless communication means mounted to the digital subscriber line matching device for a wireless DSL service; Wireless connection means for determining a wireless DSL service area, connected to the telephone station side wireless communication means with an optical cable, and providing a wireless connection of a subscriber station; And Subscriber-side wireless communication means located in a service area of the wireless access means and wirelessly connected to the wireless access means to provide a wireless DSL service to the subscriber terminal. Data access device using a digital subscriber line matching multiplexer comprising a. The method of claim 1, The wireless connection means, Determine wireless data connection (Wireless DSL) service coverage, and are connected to the telephone station-side radio communication means by an optical cable, convert the optical signal transmitted from the telephone station-side radio communication means into a radio frequency signal, and transmit it through an antenna; A data access device using a digital subscriber line matching multiplexer, characterized in that a radio frequency signal received through an antenna is converted into an optical signal and transmitted to the telephone station side wireless communication means. The method according to claim 1 or 2, The telephone station side wireless communication means, It is connected to the network using the interworking system with the network side of the well-known digital subscriber line matching device as it is, and is connected to the wireless connection means with an optical cable, and wireless data connection to the subscriber terminal together with the subscriber side wireless communication means (Wireless DSL). A data access device using a digital subscriber line matching multiplexer, characterized by providing a service. The method of claim 3, wherein The wireless connection means, A digital subscriber line matching multiplexer which performs a wireless modem function corresponding to the subscriber side wireless communication means together with the telephone station side wireless communication means connected by an optical cable, and determines a wireless data connection (Wireless DSL) service area. Data connection device used. The method of claim 4, wherein The subscriber side wireless communication means, Providing a wireless data connection (Wireless DSL) service to the subscriber station, which is located within the area of the radio access means and which, together with the telephone station side radio communication means and the radio access means, ensures portability and mobility through a wireless medium connection; A data access device using a digital subscriber line matching multiplexer.