KR20010025453A - Simple wireless private branch exchange for transferring voice signal on voice network - Google Patents

Abstract

PURPOSE: A small PBX(Private Branch Exchange) is provided to transmit voice signals received through a VoDSL(Voice over DSL(Digital Subscriber Line)) network to a wireless telephone of a subscriber system, by using the VoDSL network, so as to improve QoS(Quality of Service) and to reduce a cost for voice calls. CONSTITUTION: A VoDSL(Voice over DSL(Digital Subscriber Line)) interface(230) converts a data signal or a voice signal transmitted through an external network into signals for being processed in an internal network, or converts a data signal or a voice signal supplied from the internal network to transmit the data signal and the voice signal through the external network. A main controller(232) decides transmission paths of the voice signals, and generates control signals. An R/F controller(233) converts the voice signals into R/F signals, and controls voice signal transmissions with a wireless telephone(252). An R/F transceiving card(234) transmits the R/F signals to the wireless telephone(252).

Description

Wireless private exchanges that transmit wireless voice signals over a network {SIMPLE WIRELESS PRIVATE BRANCH EXCHANGE FOR TRANSFERRING VOICE SIGNAL ON VOICE NETWORK}

The present invention relates to a wireless private exchange capable of transmitting wireless voice signals using a network capable of transmitting voice signals.

With the development of science and technology, services that transmit voice signals, image data, text data, or other video data among people are becoming a popular type of service. The most commonly used data transmission service is a voice signal transmission service, which is performed through a telephone network.

The transmission of voice signals took place over landline networks after Bell invented the telephone in 1876. As in an office or an enterprise, a voice signal providing service for a plurality of users uses a private branch eXchange (hereinafter referred to as a PBX) to provide a call service between an extension and an extension. PBXs are typically used in the form of providing voice signals to subscribers, but as multimedia technologies are developed, they are being used to provide various multimedia services.

On the other hand, with the rapid development of communication technology, the transmission of wireless voice signals such as voice signal transmission using personal digital assistants (PDAs), cellular phones, or mobile phones, or satellite signals is becoming practical. to be.

In recent years, a technology for carrying voice signals on a network configured for data transmission, such as the Internet, for example, Voice over IP (VoIP), Voice over Frame Relay (VoFR), Voice over ATM (VoATM) or Voice over Voice over VoDSL Implementations such as DSL enable faster voice signal transmission.

VoIP is a technology for transmitting voice signals over an IP network configured for data transmission. IP networks are intended to transmit and receive data. They are not designed to carry voice, an analog signal. This is because in the case of voice to be delivered in real time, the voice signal may be lost or not transmitted because other data is affected by the packet network to transmit data.

However, due to the inexpensive cost of the IP network, if the voice signal can be transmitted and received through the IP network, the advancement of the technology for steadily delivering voice over the IP network has been realized. It has been. It was the huge network called the Internet that has fueled the birth of VoIP that delivers voice over these IP networks. The origin of VoIP can be said to be an Internet phone designed to make calls over the Internet, where the world is connected like a spider's web.

VoFR is a technology for transmitting voice signals using frame relay (FR) technology. Frame relay is a technology that simplifies packet switching technology and transmits (relays) a frame of a data link layer, which is the second layer of the Open System Interconnection (OSI) reference model, at high speed. It is designed to be used for instantaneous burst data transmission, such as local area network (LAN) connections.

The background of the frame relay technology is that the reliability of physical communication (line level) has dramatically improved with the recent advancement of telecommunication technology centering on the optical communication technology. In other words, the electrical transmission error is reduced, meaning that transmission control at the data link layer is meaningless. In addition, by not performing such transmission control, the data transmission processing speed in the premises is further improved, and the user can receive a high-speed service capable of using channel / band division such as packet switching without delay such as leased line / line switching. It became.

VoATM is a technology for transmitting voice signals using Asynchronous Transfer Mode (ATM). A method of transmitting a fixed size data cell using ATM as a reference model.

ATM technology uses the switching technology used in voice communication to process data communication. It uses virtual channel circuit switching and communicates with a fixed length cell of 53 bytes. In addition, since the same cell is used in LAN / WAN as a base technology of the next-generation network B-ISDN (Broadband ISDN), and the voice exchange technology has been developed, QoS (Quality of Service) is more advantageous than any other technology. Fully supports multimedia.

On the other hand, DSL (Digital Subscriber Line) is a service for data transmission only, the purpose of satisfying the need for Internet connection as an alternative to the low-speed dial-up modem as well as expensive T1 service. DSL is a voice signal for DSL networks such as symmetric DSL (SDSL), asymmetric DSL (ADSL), multi-rate DSL (MDSL), high-bit-rate DSL (HDSL), or very high-bit-rate DSL (VDSL). By attaching it, it is configured to provide integrated voice / data, and thus provide various benefits to users.

Modern PBXs are connected to public telephones (Public Switched Telephone Networks, or PSTNs), as well as communications services such as ISDN (Integrated Services Digital Networks), ATM, IP, or DSL, as well as telephony services between stations. It is being transformed to provide communication services.

Among them, a technique for transmitting voice signals and data together over the Internet has been greatly attracted by using VoIP technology for transmitting voice signals using IP. However, since the VoIP and voice signals are transmitted together, the VoIP technology has a problem in that the sound quality is degraded and the time for transmitting the voice signals is delayed, as compared with the case of the DSL for transmitting the voice and data signals separately. .

In addition, VoIP is vulnerable in terms of guaranteeing QoS, scalability and bandwidth constraints required for high volume applications. In particular, since IP-based networks do not have a standard suitable for custom management of data streams according to applications, when pipes are congested in case of real-time voice traffic, traffic transmission is delayed or sound quality is deteriorated.

Therefore, in recent years, while trying to efficiently transmit voice signals and provide broadband Internet services, VoDSL services are provided to reduce the burden on small businesses. VoDSL is proposed to maximize the use of existing network capital and to expand service functions.

1 illustrates a network configuration of a general VoDSL network.

Referring to FIG. 1, the subscriber center 10 transmits a voice signal or a data signal through an ATM / frame network or a DSL network using electronic equipment such as a telephone 14, a fax 16, or a computer 18. . The regional switching center (RSC) 40 transmits a voice signal through the PSTN 50 or a data signal through the Internet 60. The voice signal or data signal provided from the subscriber center 10 is provided to the ATM / frame network 30 through a Digital Subscriber Line Access Multiplexer (hereinafter referred to as DSLAM). In the ATM / frame network 30, a voice signal and a data signal are separated and transmitted or vice versa.

An integrated access device (hereinafter referred to as IAD) 12 installed in the subscriber center 10 multiplexes voice signals and data signals transmitted through the ATM / frame network 30. At this time, the IAD 12 operates as a circuit gateway or a packet gateway, and provides subscribers with standard telephone service through 16 analog Plane Old Telephony Service (POTS) ports and Internet service through an Ethernet connection. .

DSLAM (20) is a network equipment generally installed in a telephone station, receives a voice signal or data signal from the DSL network of multiple subscribers, and serves to send a signal to a high-speed backbone line using multiplexing technology. That is, it centralizes the DSL subscriber line and routes it through the ATM / frame network 30 to the class 5 PSTN switch 44 of the regional switching center 40. The DSLAM 20 allows data packets to be retransmitted or delayed according to the priority of the traffic and ensures that the main application can use the bandwidth. This network traffic priority plays an essential role in helping to provide voice or video applications to subscribers without difficulty. It also queues application servers, ensuring bandwidth and high quality services.

At the regional switching center 40, the voice gateway 42 converts the packet-based voice signal transmitted from the ATM / frame network 30 into a general voice signal and provides it to the circuit-based PSTN switch 44, or vice versa. In charge of the function. The PSTN switch 44 transmits the voice signal to the corresponding user through the PSTN 50. In addition, the router 46 serves to transmit a data signal provided through the ATM / frame network 30 to the corresponding user via the Internet (60).

On the other hand, in the case of a workplace where a plurality of employees are employed, a private switch PBX is provided inside the subscriber center 10 to transmit a voice signal through the IAD 12.

Existing VoDSL solutions proposed by Cisco, Lucent, or Alcatel use ATM over DSL (ARM) over DSL to connect the telecommunications company's central offices and connect subscribers' phone and data devices. Install an integrated access device that provides connectivity for Next, the carrier's DSLAM sends the voice signal to the central ATM switch, which then sends it to the public switched telephone network.

However, the transmission of voice signals using VoIP technology or VoDSL network generally uses a wired network using a wired telephone. In-house telephone network using the wired network requires continuous maintenance and maintenance, such as the need to modify the movement of the phone and the network configuration when the personnel movement or the user's location changes. Therefore, each time the subscriber center changes the network configuration, a problem arises in that a separate cost is required to apply the changed information.

In addition, when using a wired private exchange of a subscriber center, the contents of a call made in the subscriber center are often not properly secured.

The present invention provides a wireless private exchange that can transmit voice signals wirelessly among a plurality of users through the VoDSL network, thereby minimizing the cost of network configuration and making maintenance more efficient. The purpose is.

Another object of the present invention is to provide a wireless private exchange having a security function by encrypting and transmitting a voice signal transmitted during a call with an internal or external device.

Another object of the present invention is to provide a wireless private exchange that can be used by connecting to various networks in addition to VoDSL networks by exchanging interface devices.

1 is a network configuration diagram of a typical VoDSL network.

2 is a diagram illustrating a screen of a subscriber system connected to a VoDSL network using a wireless private exchange according to a preferred embodiment of the present invention.

Figure 3 is a software block diagram for explaining the operation of the wireless private exchange in accordance with a preferred embodiment of the present invention.

Figure 4 is a simplified screen example showing processing and routing functions in a wireless private exchange in accordance with a preferred embodiment of the present invention.

5 is a schematic structural diagram of a wireless private exchange in accordance with a preferred embodiment of the present invention.

6 is a detailed internal configuration diagram of a wireless private exchange in accordance with a preferred embodiment of the present invention.

7 is an internal block diagram of a VoDSL interface unit in a wireless private exchange in accordance with a preferred embodiment of the present invention.

8 is a diagram showing a software function configuration of a wireless private exchange according to a preferred embodiment of the present invention.

9 is a block diagram of a subscriber system using a wireless private exchange in accordance with another preferred embodiment of the present invention.

<Name of code for main part of drawing>

10: subscriber system 20: DSLAM

30: ATM / frame network 40: regional switching center

50: PSTN 60: Internet

200: wireless private exchange 210: data line

220: voice line 202: computer system

205: cordless phone 230: VoDSL interface

232: main control unit 233: R / F control unit

234, ..., 237: R / F transceiver card 241, ..., 244: wired transceiver card

245, 246: hub 247: power supply

302: VoDSL port 304: line drive

306: conversion unit 308: DSL interface

312: voice signal transmission unit 314: flash EEPROM

316: SDRAM 318: central processing unit

322: digital signal processing unit 324: Ethernet interface

326: Ethernet port 332: power processing unit

342, ..., 348: Dial-up port

In order to achieve the above object, the wireless private exchange of the present invention converts a digital data signal or voice signal transmitted through an external network into a signal that can be processed in an internal network, or converts a data signal or voice signal provided from an internal network to an external device. A network interface unit for converting transmission through a network, a main control unit for determining a transmission path of a voice signal provided from the network interface unit, generating a control signal for each component, and a voice signal transmitted from the main control unit An R / F control unit for converting into a wireless R / F signal and controlling voice signal transmission with a corresponding wireless telephone, and at least one R for transmitting the wireless R / F signal provided from the R / F control unit to the wireless telephone. / F transmission and reception card, the network interface unit, main control And it may include a R / F control and power supply unit that supplies the necessary power to the R / F card transmitting and receiving.

The external network may be one of VoDSL, VoIP, VoFR or VoATM.

The wireless private exchange of the present invention may further include a wired transmitting / receiving unit for transmitting the voice signal provided from the main controller to a corresponding landline telephone through a general wireline when the transmission of the wireless voice signal is not normal.

The wireless private exchange of the present invention may further include a data transmitter for transmitting a data signal provided through the network interface unit to a corresponding computer system.

The data transmitter may include one or more hubs that transmit data signals to a plurality of users.

The network interface unit may include a line driver which amplifies a digital data signal or a voice signal provided through an external network to a wireless telephone or a computer system of a user, and a frequency using the data signal or voice signal provided by the line driver inside the switch. A converting unit converting the signal into a signal, an interface matching unit converting the data signal or the voice signal provided through the converting unit so as to be recognized within the network interface unit, and a transmission path of the data signal or the voice signal provided through the interface matching unit. Peripheral network equipment can recognize the central processing unit, a memory for storing data signals or voice signals transmitted through the central processing unit, and data signals provided from the central processing unit. A data interface which converts the digital voice signal transmitted through the central processing unit into an analog voice signal which can be heard by a human, and an analog voice provided by the digital signal processor. It may include a voice signal transmitter for transmitting a signal to the main controller.

The line driver may include an echo canceller for removing noise or noise included in a data signal or a voice signal.

The memory may include extension number data for establishing a connection with a wireless telephone.

The wireless private exchange of the present invention may further include a power supply unit for supplying power to at least one of the line driver, the converter, the interface matching unit, the central processing unit, the memory, the data interface unit, the digital signal processing unit, or the voice signal transmitting unit. have.

The R / F control unit may include a voice signal compression unit for compressing and transmitting a voice signal in packet units.

The R / F control unit may transmit a voice signal using a CVSD coding technique.

The wireless private exchange of the present invention may further comprise monitoring means for monitoring the communication status of each wireless telephone.

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

2 illustrates an example of a screen of a subscriber system connected to a VoDSL network using a wireless private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 2, a wireless private exchange (Small Wireless PBX of VoDSL: SWPV: 200) exchanges data and voice signals through a VoDSL network. 2 illustrates a case where the data signal and the voice signal are processed together using the wireless private exchange 200, and the data signal and the voice signal transmitted through the VoDSL network are separated, respectively, and the data line 210 and Provided via voice line 220.

Data signals transmitted via data line 210 are transmitted to one or more data processing devices, such as personal computer 202, each user using them to perform a task. The voice signal transmitted through the wired voice line 220 is provided to a voice processing device using a wire, such as a fax or a wired telephone.

In addition, the wireless private exchange 200 of the present invention may transmit a voice signal to a wireless telephone provided in the subscriber system by using a wireless interface protocol such as Bluetooth.

Bluetooth is a standard that can transmit and receive signals at high speed using a radio frequency without a physical cable between various electronic devices. Bluetooth uses a high radio frequency of 2.4 GHz, allowing wireless communication even in the presence of obstructions, with low power dissipation of less than 100 mW at 2.7 V. Instead of Bluetooth, IrDA may be used for wireless communication using infrared rays.

Figure 3 shows a software configuration for explaining the operation of the wireless private exchange according to the preferred embodiment of the present invention.

Referring to FIG. 3, the wireless private exchange of the present invention includes a VoDSL interface for transmitting digital signals through a VoDSL network, and an R / F interface for wireless communication using an R / F signal. The VoDSL interface plays a role of transmitting or receiving 53 bytes of packet data when using an ATM network, and the R / F interface corresponds to a radio signal corresponding to a converted RF signal for wireless communication among the signals transmitted through the VoDSL network. It transmits to a telephone, or receives an RF signal transmitted from a wireless telephone and transmits it to another wireless telephone inside or outside.

In this case, the wireless private exchange includes a routing function for an R / F interface or a VoDSL interface so that several users can use one network together.

In addition, a call processing function is provided for call processing of a plurality of telephones and an entire system. The management of the entire system is implemented in the wireless private exchange to use the wireless processing, and the statistics related to the best voice call service can be managed by analyzing the status of each phone so that the data related to the call can be managed efficiently. have. That is, by managing tasks such as call control, call routing, and real time report in the central processing unit of the wireless private exchange, statistics and fault tracking of data can be achieved.

To this end, it includes a database for recording the extension number of each wireless telephone, the call status and the failure situation.

In addition, the call connection configured according to the call control method controlled by the central processing unit (Call Connection) is connected to each of the plurality of telephones to make a voice call, by configuring to transmit the voice call or communication results to the central processing unit, The processing speed of the central processing unit can be improved.

4 illustrates a simple example screen of a hierarchical centralized structure in which a centralized structure and a distributed processing structure are merged in a wireless private exchange according to a preferred embodiment of the present invention.

As shown in Figure 4, the connection and communication with the plurality of wireless telephones is routed at the wireless private exchange. That is, the wireless private exchange monitors the communication status of each wireless telephone individually, thereby controlling call setup and communication. At this time, one or more telephones can talk simultaneously. This routing function is centrally controlled by managing it in the portion responsible for the processing of the wireless private exchange, such as the central processing unit. In other words, call processing is centrally controlled through a central processing unit, and calls using voice signals are directed to each telephone through a routing function.

5 shows a schematic configuration diagram of a wireless private exchange 200 according to a preferred embodiment of the present invention.

Referring to FIG. 5, the wireless private exchange 200 of the present invention includes a VoDSL interface 230, a main controller 232, an R / F transmission / reception card 234,..., 237, and an R / F controller 233. ), A wired transmission / reception card 241, ..., 244, hubs 245 and 246, and a power supply unit 247.

The VoDSL interface 230 is connected to a high speed data transmission network such as a VoDSL network to transmit a data signal or a voice signal. The main processing unit (MPU) 232 controls a call with a wireless telephone or a wired telephone according to the voice signal provided from the VoDSL interface 230. The plurality of R / F transceiver cards 234, ..., 237 transmit R / F radio signals to telephones of 10 to 20 extension users per channel. The R / F control unit 233 transmits a control signal to the R / F transmission / reception card 234,... 237 so as to be connected to a corresponding telephone in accordance with the voice signal transmitted from the VoDSL interface unit 230. The plurality of wired transmission / reception cards 241,..., 244 transmits a voice signal provided from the main control unit 232 to a corresponding wired telephone through a general wired telephone line when the wireless telephone network does not operate normally. . The hubs 245 and 246 transmit data signals provided from the VoDSL interface 230 to the computer system of the corresponding user. Each component inside the wireless private exchange 200 receives power from the power supply unit 247 for operation.

6 is a view showing in more detail the internal configuration of a wireless private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 6, the VoDSL interface 230 separates data signals or voice signals transmitted through a VoDSL network, and provides the data signals to the hub 245 for transmission to a plurality of computer systems connected to data cables. do. In addition, the voice signal is converted into an analog signal and transmitted to the main controller 232 for wireless or wired transmission. At this time, a routing function for transmitting a data signal using the Internet, a function for providing a voice signal, and a wired telephone connection function are provided to be compatible with the case of a conventional landline telephone. In addition, when processing a digital signal, an echo cancellation function is included to remove an echo phenomenon, and a buffer function is provided to compensate for a jitter phenomenon in which a delay time varies according to a transmitted data packet.

One or more hubs 245 are provided according to the number of internal computer systems 251 forming the subscriber system, and supply input data signals to each computer system 251. The computer system 251 determines the data signal transmitted through the hub 245, receives the data signal provided to it, processes it accordingly, and ignores it if it is not a data signal transmitted to it.

The main controller 232 is a part for controlling a data signal or a voice signal provided through the VoDSL interface 230 to be provided to a user's computer system or a telephone. That is, by using the extension number assigned to each wireless telephone, the voice signal provided from the VoDSL interface 230 to transmit the voice signal transmitted through the VoDSL network to the wireless telephone of the corresponding extension number is R / F control unit ( 233). On the other hand, when an error occurs in the R / F control unit 233 or the R / F transmission / reception card 234 or the wireless telephone 252 does not operate normally, and a wireless call is not made, a wired transmission / reception card is transmitted. To 241. It also includes a function of monitoring the transmission state of the voice signal by checking the transmission state of the voice signal, information on the telephone in the current call state, or the occurrence of a failure.

The R / F control unit 233 converts the voice signal provided from the main control unit 232 into an RF signal and transmits it to the R / F transmission / reception card 234. At this time, the control signal is transmitted together so that one or more channels can be controlled at the same time. In addition, in the case of transmitting a voice signal between users in the subscriber center, information on the call signal is collected and analyzed, and the result is provided to the main controller 232 to check the voice communication state. Make sure The R / F controller 233 may use a continuous variable slope delta modulation (CVSD) speech coding scheme. In the case of transmitting a voice signal using such a coding technique, since a process of retransmitting the voice signal according to the transmission state is not included, the time required for checking a transmission error can be reduced and the voice signal can be transmitted more quickly.

The R / F transmission / reception card 234 transmits a voice signal to the corresponding telephone according to the control signal of the R / F control unit 233, and in the case where the voice signal and the control signal are transmitted from the telephone, the R / F control unit ( 233). At this time, the R / F transmission / reception card 234 sets a designated channel region and communicates only with the corresponding region.

In this case, when the voice signal is compressed and transmitted in packet units in the process of transmitting the voice signal, the digital network uses the minimum bandwidth, thereby enabling more efficient signal transmission. For example, a G.711 pulse code modulation (PCM), a G.726 ADPCM, or a G.723 dual rate voice coder may be used. In particular, in order to prevent information leakage, an encoding and decoding technique of encrypting and transmitting a voice signal is used.

In addition, the amplification of the signal in the process of transmitting the voice signal is preferred to use an analog amplification technology that has a higher amplification rate than the digital amplification, and excellent noise removal effect.

The wired transmission / reception card 241,..., 244 is a part that provides a telephone line to directly transmit a voice signal provided through a VoDSL network to a general telephone, and informs the main controller 232 of information on port usage.

7 illustrates an internal block diagram of a VoDSL interface unit in a wireless private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 7, the VoDSL interface 230 is connected to a VoDSL network or an xDSL network such as ADSL or SDSL through a network connection port 302.

The line driver 304 amplifies the data signal or the voice signal provided through the network connection port 302 to be transmitted to the wireless telephone or the user's computer system. In this case, the line driver 304 also performs a filtering role to block noise or noise included in the data signal or the voice signal. In general, the biggest problem with voice signals is the delay or jitter of the voice signals, which causes the quality of the digital packet signal transmission to deteriorate. As described above, in order to eliminate echoes caused by jitter, an echo canceller is used at an end of a VoDSL connection or at a certain point on a network. The echo canceller is included in the line driver 304 connected to the VoDSL network.

In this case, it is preferable to use a hybrid type which is more effective than an acoustic type as an echo cancellation technique for reducing echo of a voice signal.

The converter 306 converts a data signal or a voice signal provided through the line driver 304 into a signal of a frequency used in the wireless private exchange 200.

The DSL interface 308 converts a data signal or a voice signal provided through the VoDSL network into a signal that can be recognized by the central processing unit 318. In case of using IP or FR technology without using a DSL network for transmitting voice signals, the interface 308 may be exchanged accordingly.

The central processor 318 is a part for controlling signal processing for each part of the VoDSL interface 230 and includes an Arithmetic Logic Unit (ALU) for performing calculation. The central processing unit 318 includes Digital, Alpha, MIPS Technology, NEC, IDT, Siemens, MIPS, Intel and Cyrix, AMD, and Nexgen. It could be a processor with a variety of architectures, such as the company's x86 and IBM and Motorola's PowerPC.

In addition, the central processing unit 318 includes a memory system for storing temporary data or permanent data. Memory systems typically include high-speed main memory, a form of storage medium such as random access memory (RAM) or read only memory (ROM), and long-term storage of floppy disks, hard disks, tapes, CD-ROMs, and flash memory. term) a secondary storage device in the form of a storage medium and a device for storing data using an electrical, magnetic, optical or other storage medium. FIG. 6 illustrates an example of using a flash electrically erasable-programmable ROM (EEPROM) 314 and 8 MB of synchronous dynamic RAM (SDRAM).

It will be apparent to those skilled in the art that the central processing unit and the memory may have various forms as products having various storage capabilities.

The Ethernet interface 324 converts the data signal provided through the central processing unit 318 to be recognized by peripheral network equipment such as Ethernet, and transmits it to the hub through the Ethernet port 326. If you use a different network, such as a token bus or token ring other than Ethernet, you can use the corresponding interface accordingly.

In addition, Ethernet ports that transmit data signals generally use 10BaseT, which transmits data at a bandwidth of 10Mbps through an untwisted pair (UTP) cable. However, in recent years, Fast Ethernet or 1 Gigabit Ethernet technology has been proposed, and accordingly, the specification of 100BaseT or more can be applied.

Meanwhile, the wireless private exchange of the present invention may be connected to a VoDSL network and used for transmitting a voice signal, and a separate dedicated line may be used for data transmission.

The digital signal processing unit 322 converts the digital voice signal transmitted through the central processing unit 318 into an analog voice signal that can be heard by a human. The voice signal transmitter 312 supplies power to the phone and transmits a ring signal and a voice signal through voice ports 342,... 348 for voice signal transmission. The voice signal is provided to the main control unit 232 through the voice ports 342, ..., 348, and is transmitted to the R / F control unit 233 or the wired transmission / reception card 241 according to a wireless call or a wired call. do.

The power processor 332 converts the power supplied through the power supply port 334 into power used in each part of the VoDSL interface 230, and supplies the power to the corresponding part.

On the other hand, the software function of the wireless private exchange having such a configuration will be described as follows.

8 shows a software function configuration of a wireless private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 8, an operating system (OS) 410 of a wireless private exchange uses a real time operation system (RTOS) to easily control various hardware. That is, it manages the operation of each hardware in real time, and provides resources for programs to operate stably.

The Call Management System (CMS) 420 manages call processing and call routing. When a plurality of users communicate, the Call Management System (CMS) 420 manages a plurality of users to communicate smoothly through one channel.

The DBMS (Database Management System) 430 is used to store data related to call processing and call routing and data on system state made by the CMS 420 and is required for stable call management and system management. At this time, it should be easy to access, update, and change data from the RTOS 410, and be able to handle massive online transactions. In addition, the flexibility of processing and distributing data, the scalability of data structures, and the consistency of data must be ensured. Generally, Oracle or SQL can be used.

APPS (Applications: 440) is for enabling a user to use wireless communication smoothly, and monitors the status of a wireless telephone, reports an error when it occurs, and processes log data. In addition, when a new cordless phone is installed or an existing cordless phone is removed, it is identified and the system is changed accordingly. On the other hand, since an extension number is assigned to each wireless telephone and each extension number is stored in the DBMS 430, such a telephone directory is managed and a fault is handled according to the state of the telephone. In this case, a failure state may be displayed through a display element such as an LED (light emitting diode) provided in a port corresponding to an error occurring in the wireless telephone. In addition, when a voice signal is transmitted through wireless or wired, echo generation is prevented and traffic of the entire network is managed. In particular, a function for periodically diagnosing the state of the wireless private exchange is needed.

The functions of these applications can be classified as follows for the entire system and individual systems.

In the whole system, it has a function of checking whether a system error occurs and recovering the system itself when an error occurs. In other words, it periodically checks and deletes unnecessary data in the database, and cleans up data that conflicts between applications.

In addition, a plurality of users who use a wireless telephone or a wired telephone may be assigned a rating for each user, and call priority may be given according to the rating. As a result, details on call permission or call rejection by grade can be prepared, and the extension group and division type can be specified. At this time, the extension group and the split format may be different depending on the day or night. In addition, it designates a group and its rank which can sequentially respond when the designated user is absent, and manages the call connection state accordingly.

On the other hand, when talking to an internal user from the outside, it is possible to designate and assign a direct telephone number so that a direct call can be made without going through a separate extension number. In order to be able to change and modify the internal state and system management functions of the wireless private exchange, the administrator is given an accessible code to access the exchange separately.

In addition, when the internal user is in a call, the user may designate music to be generated during the call waiting time, or when the internal user is absent, the corresponding user may input a guide message for the internal user. In order to allow the administrator to maintain a smooth communication state, the call state of each line is displayed.

In particular, when a voice call is made between an internal user and an internal user, after the call connection of the wireless private exchange, the connection between the wireless telephone and the wireless private exchange is cut off, and the voice call is directly made between the internal user's wireless telephone. This allows more efficient calling.

In addition, it is desirable to monitor in real time such a voice call, that is, a call between an internal user and an internal user or a call state between an internal user and an external user, and to efficiently manage the entire communication system according to the connection state.

In a separate system for each cordless phone or landline phone, it is possible to assign a password to the phone provided to each user and to control extension usage. In addition, the extension type of the user's extension can be individually designated, and the auto hold function and the background music can be selectively designated.

9 is a block diagram of a subscriber system using a wireless private exchange according to a preferred embodiment of the present invention.

Referring to FIG. 9, the wireless private exchange 200 is connected to a VoDSL network and provides a voice signal transmitted therefrom to a corresponding wired or wireless telephone. The data processing apparatus 300 relaying the data signal is connected to a separate dedicated line for data transmission, thereby providing a data signal to the corresponding computer system 202. That is, instead of transmitting the voice signal and the data signal through the wireless private exchange 200, the wireless private exchange 200 relays the voice signal and transmits the data signal through a separate data processing apparatus 300.

As such, when configuring a subscriber system, the wireless private exchange 200 does not require an Ethernet port, an interface device, or software for processing data signals.

In the above, a case of performing wireless communication using a VoDSL network having excellent transmission efficiency of voice signals and data signals has been described as an example. However, the network interface unit of the wireless private exchange 200 may be connected to a network such as VoIP or PSTN. 230 may be exchanged. Accordingly, other networks such as VoIP or PSTN can be used for wireless communication using the wireless private exchange of the present invention.

As described above, the wireless private exchange of the present invention transmits a voice signal through a wired telephone by transmitting a voice signal transmitted through a network for transmitting a voice signal, for example, a VoDSL network, to a wireless telephone in a subscriber system. Compared to the case, it is possible to reduce the time or cost required for configuration changes such as location change or new layout in the subscriber system. In particular, by using the VoDSL network rather than the general network, it is possible to improve the sound quality and reduce the cost for voice calls.

That is, when the user of the wireless telephone is moved, added, or deleted, the telephone system or the user information stored in the memory inside the switch is changed to modify the communication system without physical changes such as network connection or movement of the telephone. This is possible. In the case of the wireless telephone, the configuration of the memory card installed inside the telephone can be changed, whereby the subscriber system can be changed more conveniently.

In addition, the wireless private exchange of the present invention may maintain a stable call state by detecting a failure in a wireless communication state and making a call through an existing landline.

In addition, the wireless private exchange of the present invention can easily change the usage of the exchange by simply exchanging the network interface unit according to the type of the network transmitting the voice signal.

In addition, by performing a call connection in a distributed processing manner and performing a call processing and management in a centralized manner, the processing speed of a voice call can be increased.

In addition, the wireless private exchange of the present invention can reduce the echo or jitter generated during the transmission of the voice signal by using the echo canceller.

In addition, the voice signal is compressed and encrypted in a packet unit to transmit the voice signal, thereby maintaining the security of the voice call.

In addition, by monitoring the user's communication status and error occurrence in real time, and thereby control the communication status by itself, it is possible to efficiently manage the traffic, it is possible to reduce the cost and time for management.

In the above, preferred embodiments of the wireless private exchange of the present invention have been described in detail, but the contents are not limited to the field of the present invention described in the following claims. In addition, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the present invention.

Claims (10)

In a system for transmitting voice signals through an internal network and an external network, Data signals or voice signals transmitted through an external network that can transmit voice signals and data signals together can be converted into signals that can be processed in the internal network, or data signals or voice signals provided from the internal network can be transmitted through the external network. To convert the network interface unit; A main controller which determines a transmission path of the voice signal provided from the network interface unit and generates a control signal of each component part; An R / F control unit for converting a voice signal transmitted from the main control unit into a wireless R / F signal and controlling a voice signal transmission with a corresponding wireless telephone; An R / F transceiver for transmitting a wireless R / F signal provided from the R / F controller to a wireless telephone; And Power supply unit for supplying the power required for the network interface unit, the main control unit, the R / F control unit and the R / F transceiver Wireless private exchange comprising a. The method of claim 1, The external network is Wireless private switch, either VoDSL, VoIP, VoFR, or VoATM. The method of claim 1, In the case where the transmission of the wireless voice signal is not normal, the wired transceiver unit for transmitting the voice signal provided from the main control unit to a corresponding landline telephone through a general wireline telephone line. Wireless private exchange further comprising. The method of claim 1, Data transmission unit for transmitting the data signal provided through the network interface unit to the corresponding computer system Wireless private exchange further comprising. The method according to claim 1 or 4, The network interface unit A line driver for amplifying a digital data signal or a voice signal provided through an external network to be transmitted to a wireless telephone or a computer system of a user; A converter for converting a data signal or a voice signal provided by the line driver into a frequency signal used inside the switch; An interface matching unit for converting the data signal or the voice signal provided through the conversion unit so as to be recognized within the network interface unit; A central processing unit controlling a transmission path of a data signal or a voice signal provided through the interface matching unit; A memory for storing a data signal or a voice signal transmitted through the central processing unit; A data interface unit converting the data signal provided from the central processing unit so that neighboring network equipments can recognize and providing the same to the data transmission unit; A digital signal processor for converting the digital voice signal transmitted through the central processor into an analog voice signal that can be heard by a human; And Voice signal transmitter for transmitting the analog voice signal provided from the digital signal processor to the main controller Wireless private exchange comprising a. The method of claim 5, The line driver Echo canceller to remove noise or noise contained in data signals or voice signals Wireless private exchange comprising a. The method of claim 5, The memory is Extension data for establishing a connection with a cordless phone Wireless private exchange comprising a. The method of claim 1, The R / F control unit Voice signal compression unit for compressing and transmitting voice signals in packet units Wireless private exchange comprising a. The method of claim 1, In the R / F control unit, the transmission of the voice signal Wireless private exchange using CVSD coding technique. The method of claim 1, Monitoring means for monitoring the communication status of each cordless phone Wireless private exchange comprising more.