KR100734869B1 - Wired/wireless connection device, wireless matching device and telephone device for VoIP service - Google Patents

Abstract

V. O.I.P. Disclosed are a wired / wireless access device, a wireless matching device, and a telephone device using the same. The wire / wireless access device of the present invention includes a wireless matching unit for receiving a radio signal according to a wireless matching protocol having a low transmission bandwidth of less than a predetermined transmission rate; A multiplexer / demultiplexer for discriminating whether a radio signal is a call setup signal or voice data; A call processor for converting a radio signal into a communication protocol signal suitable for a wired network if the radio signal is a call setup signal; A voice codec unit for converting voice data into voice data according to a standard if the wireless signal is a voice data signal; A packet generation unit generating a packet corresponding to a signal output from the call processing unit or the voice codec unit; And a wired network matching unit for transmitting the generated packet to the wired network.

Description

V. O.I.P. Wired / wireless access device, wireless matching device, and telephone device using the same service {Wired / wireless connection device, wireless matching device and telephone device for VoIP service}

FIG. 1 schematically illustrates a network configuration in which a general PSTN network and an IP network interoperate with each other.

2 schematically illustrates a device configuration for a wireless VoIP service over an IP network.

FIG. 3 illustrates an internal block diagram of the wired / wireless connection device of FIG. 2.

FIG. 4 shows an internal block diagram of the wireless telephone terminal 23 shown in FIG.

5 illustrates a packet format for transmitting and receiving VoIP-related data in the Zigbee MAC layer.

6 is a flowchart illustrating a call setup and voice call process between the wired / wireless access device 21 and the wireless terminal 23 according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wired / wireless access device, a wireless matching device, and a telephone device using the same for a Voice over Internet Protocol (VoIP) service. In particular, ZigBee having a low transmission bandwidth is used. The present invention relates to a wired / wireless access device for providing VoIP service, a wireless matching device, and a telephone device using the same.

VoIP is an IP telephony technology for a series of facilities that deliver voice information using the Internet Protocol (IP). In general, VoIP means sending voice information in digital form in discrete packets, rather than a traditional circuit-based protocol like PSTN, a Public Switched Telephone Network. The main advantage of VoIP and Internet telephony technology is that it integrates telephone service by utilizing existing IP network so that telephone users can receive long distance and international phone service in internet and intranet environment with only local call charge.

VoIP was created through the VoIP Forum to encourage the use of ITU-T H.323, the standard for transporting voice and video over IP over the public Internet or intra-company intranets. The VoIP Forum also encouraged directory service standards, enabling users to locate other users and enabling the use of touch phone signals for automatic telephone distribution and voicemail.

In order to service such VoIP in wired and wireless sections, it is necessary to match the radio section supporting high transmission bandwidth. However, a high performance processor and a wired / wireless matching device having an associated high transmission bandwidth are required to process data incoming and outgoing from a high transmission bandwidth radio section and a complex protocol such as H.323.

In the related art, such a high performance processor and high transmission bandwidth process a protocol such as SIP (Session Initiation Protocol) or H.323, which is a communication protocol for VoIP service, in one terminal. However, such a high performance processor and high transmission bandwidth are unnecessary for simple voice service, and it is difficult to replace the conventional 900MHz wired / wireless telephone for PSTN due to the price increase problem due to providing higher transmission bandwidth than necessary.

The technical problem to be achieved by the present invention is a wired / wireless access device, a wireless matching device, and a telephone using the same for a VoIP service that can replace a conventional PSTN wired and wireless telephone by using a wireless matching function having a low transmission bandwidth of several hundred Kbps such as Zigbee To provide a device.

In order to achieve the above technical problem, the wired / wireless access device of the present invention includes a wireless matching unit for receiving a radio signal according to a wireless matching protocol having a low transmission bandwidth of less than a predetermined transmission rate; A multiplexer / demultiplexer for determining whether the radio signal is a call setup signal or voice data; A call processor for converting the radio signal into a communication protocol signal suitable for a wired network if the radio signal is a call setup signal; A voice codec unit for converting the voice data into voice data according to a standard if the wireless signal is a voice data signal; A packet generation unit generating a packet corresponding to a signal output from the call processing unit or the voice codec unit; And a wired network matching unit for transmitting the generated packet to the wired network.

In order to achieve the above technical problem, the wireless matching device of the present invention receives a wireless signal according to a wireless matching protocol having a low transmission bandwidth of less than a predetermined transmission rate, and transmits a signal including a voice signal or a telephone number to the wireless matching protocol. A wireless matching unit converting the wireless signal into a wireless signal and outputting the converted wireless signal; An analog / digital and digital / analog converter for converting an input voice signal into a digital signal and outputting the voice signal to the wireless matching unit, and converting a voice signal included in the received wireless signal into an analog signal; And a DTMF unit which detects an input telephone number and outputs the signal to the wireless matching unit as a signal including the telephone number.

In order to achieve the above technical problem, the telephone apparatus of the present invention includes a wireless matching device for communicating in accordance with a wireless matching protocol having a low transmission bandwidth of less than a predetermined transmission rate; And a wired / wireless access device which communicates with the wireless matching device according to the wireless matching protocol and also communicates with a wired network.

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

FIG. 1 schematically illustrates a network configuration in which a general PSTN network and an IP network interoperate with each other. As shown, voice data transmitted / received through the wired telephone 11 in the PSTN network 12 is transmitted and received to the IP network 14, which is a packet network, through the gateway 13, which is a heterogeneous interconnection device. The data is transmitted to the target computer 16 or the target portable terminal 17 through the wired / wireless bridge 15 again.

In general, for voice services through the phones 11 and 17, call setup, call termination, and voice data transmission / reception methods are required. The IP network 14 uses a communication protocol such as SIP or H.323 for call setup, termination, and transmission and reception of voice data. These communication protocols operate in the session layer corresponding to the fifth layer of the OSI 7 layer. However, identifying the packet at the session layer is a significant overload of the system. That is, packet checking is performed by inspecting a packet in the first layer of the OSI 7 layer and transmitting the packet to the second layer. The packet is repeatedly transmitted to the fifth layer, and the payload, which is the data of the packet, is transmitted. It examines and handles the relevant communication protocols. This system burden not only requires a high performance microprocessor, but also requires high transmission bandwidth. Ethernet, which has a transmission rate of 100 Mbps, shows a transmission rate of about 70 to 80 Mbps when transmitting and receiving data at the MAC layer, which is the second layer, but is about 12 when transmitting and receiving at the TCP / IP layer, which is the fourth layer. It has a transmission speed of ~ 13 Mbps.

These demands for high performance processors and high transmission bandwidths lead to an increase in the price of terminals, which puts pressure on the user to select VoIP services. In order to solve this problem, the present invention introduces a VoIP service using a low transmission bandwidth.

2 schematically illustrates a device configuration for wireless VoIP service over an IP network.

In the present embodiment, the wireless VoIP service device is configured to include a wired / wireless matching device for processing a complex communication protocol of VoIP and a wireless matching device having a low transmission bandwidth wireless matching by digitally changing a voice signal. The wireless matching device adopts a wireless matching with low transmission bandwidth in consideration of low terminal price, and adopts a Zigbee in this embodiment. However, in addition to ZigBee, all wireless matching technologies with low transmission bandwidth of several Mbps or less can be applied.

As shown, the wired / wireless connection device 21 is connected to the IP network 14 as the wired / wireless matching device, and the wireless telephone terminal 23 is connected to the wired / wireless connection device 21 as the wireless matching device. The wired / wireless access device 21 and the wireless telephone terminal 23 are connected through a communication section of low transmission bandwidth.

In general, an access point (AP) is required for a wired segment and a wireless segment for wireless VoIP service. In this embodiment, the wired / wireless access device 21 is introduced instead of the AP. As the wired / wireless access device 21, a home network gateway that provides a Zigbee function as a wireless matching technology having a low transmission bandwidth may be appropriate. In this embodiment, the wired / wireless connection device 21 and the wireless telephone terminal 23 have a form similar to that of a general 900 MHz wired / wireless telephone.

In the case of VoIP using a wireless LAN, in order to relieve the burden of SIP or H.323 adopted for call processing and voice data transmission and reception between the AP and the terminal, in the present embodiment, the wired / wireless access device 21 and the wireless telephone terminal 23 are used. The Zigbee is adopted in the wireless communication section 22 between them. However, Zigbee can't provide SIP or H.323 because it offers bandwidth limited to hundreds of Kbps. In order to solve this problem, in the present embodiment, voice data is transmitted and received in the Zigbee MAC layer. That is, the wireless telephone terminal 23 converts analog voice into digital data, and transmits the converted digital data to the wired / wireless access device 21 through the Zigbee MAC layer. The wired / wireless access device 21 performs voice codec conversion or call processing and then transmits the received data to a desired terminal device (not shown) through the IP network 14. In general, bandwidth required for transmitting and receiving voice data is about 64 Kbps, and even for a wideband voice codec capable of pin drop-quality service, it is sufficient to be within 128 Kbps or 256 Kbps. That is, when transmitting voice data through the Zigbee MAC layer, a high quality voice service is possible with a bandwidth within 300 Kbps.

FIG. 3 illustrates an internal block diagram of the wired / wireless connection device of FIG. 2. As shown, it includes a wireless matching unit 31, a multiplexing / demultiplexing unit 32, a call processing unit 33, a voice codec unit 34, a packet generator 35 and an IP network matching unit 36. do. The apparatus further includes a wired telephone module 37 to enable direct call connection through a wired or wireless connection device.

The radio matching unit 31 communicates with the radiotelephone terminal 23 via a ZigBee protocol having a stack of ZigBee RF layers, ZigBee physical layers and ZigBee MAC layers.

The multiplexer / demultiplexer 32 determines whether the signal received from the radio matching unit 31 is a call processing signal or a signal for voice data. If the received signal is a call processing signal, the call processing unit 33 converts the received Zigbee MAC layer data into a form suitable for SIP or H.323. The packet generator 35 adds a Real-time Transport Control Protocol (RTCP) header to the data converted by the call processor 33 to generate a call processing packet. The IP network matching unit 36 transmits the call processing packet to the IP network 14.

On the other hand, when the signal received from the wireless matching unit 31 is determined as the voice data by the multiplexing / demultiplexing unit 32, the voice codec unit 34 converts the received voice data into voice data conforming to the international standard. The voice codec unit 34 according to the present embodiment basically supports G.711, G.723, and G.729, which are widely used in Korea and around the world, and the TTAS-EN.01.0045, which is a wideband voice codec used in Korea, is used. Additional support for "layered multiple bit rate wideband voice codec". The voice codec unit 34 also has functions such as UP / DOWN sampling, preprocessing, Voice Activity Detection (VAD), Packet Loss Concealment (PLC), and Line Echo Canceller (LEC) for general voice codec processing. It performs functions such as Label Switched Path (LSP) and In System Programming (ISP), pitch gain adjustment, and fixed codebook search.

The packet generator 35 adds a Real-time Transport Protocol (RTP) header to the voice data converted by the voice codec unit 34 to generate a voice packet. The IP network matching unit 36 transmits the generated voice packet to the IP network 14.

On the other hand, the packet received from the IP network 14 is transmitted to the radiotelephone terminal 23 through the Zigbee protocol through the reverse process of the above-described process.

The wired / wireless connection device 21 according to the present embodiment also provides a wired telephone function through the wired telephone module 37. The wireline telephone module 37 includes a wideband voice filter 371, an A / D and D / A converter 372, a dual tone multi-frequency (DTMF) unit 373, and a CID unit 374.

The wired telephone module 37 is connected to the wideband voice filter 371 and is connected to the microphone 37-1 and the speaker 37-2 and the DTMF unit 373 for voice input and output, and provides key input such as a telephone number. And a display means 37-4 connected to the keypad 37-2 and the CID unit 374 to display the caller ID.

The broadband voice filter 371 described above will be described in more detail as follows. Normal human voice signal is about 50Hz ~ 7000Hz. However, in order to design for the TDM (Time Division Multiplexing) method, the existing phone samples and transmits the audio band of 300Hz-300Hz, which is the middle region of the human voice band, with 8-bit 8KHz. Such a voice band is called a narrow band, and a conventional telephone transmits and receives only narrow band voice. Narrowband voices do not transmit the bass and treble, making them unclear or inadequate for high-quality services. In order to solve the problem of the existing telephone, the present embodiment employs a wideband voice filter to transmit and receive a voice band of 50 Hz to 7000 Hz. Accordingly, the voice band other than the wideband voice is processed by white noise, thereby enabling high quality voice service.

On the other hand, the voice signal input through the microphone 37-1 and passed through the wideband voice filter 371 is an analog form. The A / D and D / A converter 372 converts an analog voice signal into a digital voice signal and outputs it to the voice codec unit 34.

The voice data received through the IP network matching unit 36 is processed in the reverse order of the above-described process and output to the speaker 37-2.

In addition, when a telephone number is input through the keypad 37-3 to set up a call through the wired telephone module 37, the DTMF unit 373 processes the signal received from the keypad 37-3 to the corresponding telephone number. Change it. The call processor 33 and the packet generator 35 generate an RTCP packet including the corresponding telephone number, and then transmit it to the IP network matching unit 36.

FIG. 4 shows an internal block diagram of the wireless telephone terminal 23 shown in FIG. The illustrated wireless telephone terminal 23 transmits data using a low transmission bandwidth by ZigBee and performs only a function of digitizing and transmitting a human voice in a ZigBee MAC layer without providing a complicated function such as a codec to reduce a price. do.

The illustrated wireless telephone terminal 23 includes a Zigbee matching unit 41, an A / D and D / A converter 42, a DTMF unit 43, and a wideband voice filter 44, and a microphone for voice input and output. 45 and a speaker 46 and a keypad 47 for input of a telephone number or the like.

The Zigbee matching unit 41 includes a Zigbee RF layer, a Zigbee physical layer and a Zigbee MAC layer, and communicates with the wireless matching unit 31 of the wired / wireless connection device 21.

When the ZigBee matching unit 41 receives signals from the wireless matching unit 31 in the order of ZigBee RF layer, ZigBee physical layer, and ZigBee MAC layer, the A / D and D / A converter 42 receives the received signals. Convert to an analog signal. The wideband voice filter 44 removes noise from the converted analog signal and outputs voice through the speaker 46.

Meanwhile, the voice input through the microphone 45 passes through the wideband voice filter 44 for wideband high quality voice service, and is converted into a digital signal by the A / D and D / A converter 42 to be a Zigbee matching unit. The output is 41. The Zigbee matching unit 41 transmits a digital signal in the order of ZigBee MAC layer, ZigBee physical layer, and ZigBee RF layer.

The telephone number or other information input through the keypad 47 is converted into a signal having the telephone number and information in the DTMF unit 43 and transmitted to the wireless matching unit 31 through the Zigbee matching unit 41.

The illustrated wireless telephone terminal 23 is provided with a home network gateway, provided that the home network gateway includes other functional blocks 31 to 36 except for the wired telephone module 37 in the wired / wireless access device 21 shown in FIG. 3. Communication is possible without adding additional functions.

5 illustrates a packet format for transmitting and receiving VoIP-related data in the Zigbee MAC layer.

As shown, the data received and extracted at the Zigbee RF layer includes head information and MAC protocol data. The head information includes a preamble, a start of frame delimiter (SFD) which is frame synchronization data indicating that normal frame content starts, and a frame length field. MAC protocol data includes frame control, sequence number, address field, MAC service data and frame check sequence (FCS) for error detection.

The Zigbee physical layer analyzes the head information from the data received through the Zigbee RF layer, removes the head information, and then passes the MAC protocol data to the Zigbee MAC layer.

The Zigbee MAC layer extracts and outputs control information of VoIP data using MAC service data among the received MAC protocol data. MAC service data includes VoIP control information and VoIP data. VoIP control information means different control operation according to each value. For example, as shown, if the VoIP control information value is 1, a transmission telephone number, 2 means a ring back tone indicating that a call is being set up, 3 means a busy tone, and so on.

6 is a flowchart illustrating a call setup and voice call process between the wired / wireless access device 21 and the wireless terminal 23 according to the present invention.

First, when the call button is hooked off by pressing the call button in the wireless telephone terminal 23 (step 61), a call sound is generated in the wired / wireless connection device 21 (step 62). Next, when the telephone number is input through the keypad 47, the wireless telephone terminal 23 transmits the telephone number to the wired or wireless connection device 21 (step 63). The wired / wireless connection device 21 generates a connection sound to the radiotelephone terminal 23 (step 64), and establishes a call by communicating with the IP network 14 (step 65). When the call is established, the voice call is performed (step 66), and when the voice call ends, the hook-on signal is output to the wired / wireless connection device 21 (step 67) and the call is released (step 68). The wired / wireless connection device 21 transmits a call termination signal to the IP network 14. Call setup, call progress, and call termination between the IP network 14 and the wired / wireless access device 21 comply with the VoIP protocol.

As shown, the call setup between the wired / wireless access device 21 and the wireless telephone terminal 23 considered in the present invention is the same as the method of making a call in a general PSTN telephone. Therefore, the user does not need to learn how to set up a new currency.

According to the present invention, the introduction of the Zigbee protocol for the VoIP voice call service eliminates the need for a high performance processor and high transmission bandwidth for the VoIP service, thereby reducing the cost of equipment for the VoIP voice call.

Gateways for home network services tend to provide a Zigbee matching function to control home appliances and other devices existing in the home, and the wireless matching device adopted in this embodiment is a high-quality VoIP service only by changing the software of the home gateway. Service is available.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Herein, specific terms have been used, but they are used only for the purpose of illustrating the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (15)

A wireless matching unit receiving a wireless signal according to the Zigbee protocol; A multiplexer / demultiplexer for determining whether the radio signal is a call setup signal or voice data; A call processor for converting the radio signal into a communication protocol signal suitable for a wired network if the radio signal is a call setup signal; A voice codec unit for converting the voice data into voice data according to a standard if the wireless signal is a voice data signal; A packet generation unit generating a packet corresponding to a signal output from the call processing unit or the voice codec unit; A wired network matching unit for transmitting the generated packet to the wired network; And And a wired telephone module for outputting the input telephone number to the call processing unit, outputting a voice signal input from the user to the voice codec unit, and outputting a voice signal output from the voice codec unit to the user. Wired and wireless connection device. The method of claim 1, wherein the wireless matching unit An RF layer of the Zigbee protocol for receiving the radio signal and extracting data; A physical layer of the Zigbee protocol for analyzing head information included in the data and removing the head information; And And a MAC layer of the Zigbee protocol for analyzing the data from which the head information is removed and outputting control information included in the data. The method of claim 1, The packet generation unit generates a packet by adding an RTCP header to the signal converted by the call processing unit. The method of claim 1, The packet generation unit generates a packet by adding an RTP header to the voice data converted by the voice codec unit. The method of claim 1, wherein the wire network matching unit Wired and wireless access device characterized in that the communication with the wired network according to the VoIP protocol. The method of claim 5, wherein the call processing unit SIP or H.323. A wired / wireless connection device, characterized by converting into a signal conforming to a protocol. delete The wireline telephone module of claim 1, wherein And a broadband voice filter for processing noise of the voice signal. A wireless matching unit for receiving a radio signal according to the Zigbee protocol and converting a signal including a voice signal or a telephone number into a radio signal according to the Zigbee protocol; An analog / digital and digital / analog converter for converting an input voice signal into a digital signal and outputting the voice signal to the wireless matching unit, and converting a voice signal included in the received wireless signal into an analog signal; And And a DTMF unit which detects an input telephone number and outputs the signal to the wireless matching unit as a signal including the telephone number. The method of claim 9, And a wideband speech filter for removing noise from the speech signal. The method of claim 9, wherein the wireless matching unit An RF layer of the Zigbee protocol for receiving the radio signal and extracting data; A physical layer of the Zigbee protocol for analyzing head information included in the data and removing the head information; And And a MAC layer of the Zigbee protocol for analyzing the data from which the head information is removed and extracting control information included in the data. A wireless matching device communicating according to a Zigbee protocol; And And a wired / wireless access device that communicates with the wireless matching device according to the Zigbee protocol and also communicates with a wired network. The wired / wireless access device may include a wireless matching unit configured to receive a wireless signal based on a Zigbee protocol; A multiplexer / demultiplexer for determining whether the radio signal is a call setup signal or voice data; A call processor for converting the radio signal into a communication protocol signal suitable for a wired network if the radio signal is a call setup signal; A voice codec unit for converting the voice data into voice data according to a standard if the wireless signal is a voice data signal; A packet generation unit generating a packet corresponding to a signal output from the call processing unit or the voice codec unit; A wired network matching unit for transmitting the generated packet to the wired network; And And a wired telephone module for outputting the input telephone number to the call processing unit, outputting a voice signal input from the user to the voice codec unit, and outputting a voice signal output from the voice codec unit to the user. Phone device. delete The method of claim 12, wherein the wire network matching unit And a communication device with the wired network according to the VoIP protocol. 13. The apparatus of claim 12, wherein the wireless matching device is A wireless matching unit for receiving a radio signal according to the Zigbee protocol and converting a signal including a voice signal or a telephone number into a radio signal according to the Zigbee protocol; An analog / digital and digital / analog converter for converting an input voice signal into a digital signal and outputting the voice signal to the wireless matching unit, and converting a voice signal included in the received wireless signal into an analog signal; And And a DTMF unit which detects an input telephone number and outputs the signal to the wireless matching unit as a signal including the telephone number.

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