KR20010092015A - Method and system for providing internet phone service for multimedia communication over high speed mobile internet - Google Patents

Abstract

PURPOSE: A method and a system for providing an Internet phone service for a multimedia communication in a high-speed wireless Internet network are provided to support user mobility environment by using an Internet phone for supporting a phone to PC mode, a PC to phone mode, and a phone to phone mode with a point-to-point type. CONSTITUTION: An Internet phone of a PDA generates a user call(S1) and checks whether it is a wireless LAN access region(S2). If it is not the wireless LAN access region, the Internet phone is connected to a CDMA(Code Division Multiple Access) network(S3). The Internet phone changes the user call to a user telephone number(S4) and transmits the call(S5). If it is the wireless LAN access region, the Internet phone is connected to a VoIP(Voice over Internet Phone) gate keeper(S6). The Internet phone processes a user authentication using an ID and password(S7), transmits an intrinsic number to an other terminal(S8), parses a number system(S9), and checks whether it is an intra office subscriber(S10). If it is not the intra office subscriber, the Internet phone transmits the call to a VoIP gateway(S11) and performs a call link transmission to a PSTN(Public Switched Telephone Network)(S12). If it is the intra office subscriber, the Internet phone retrieves an assigned IP address(S13) and checks whether a mapping address exists(S14). If the mapping address does not exist, the Internet phone transmits a failure process message(S15). If the mapping address exists, the Internet phone transmits the call to a wire and wireless access device(S16) and transmits and receives a video/audio/text data by a point-to-point type between a transmitter and a receiver(S17).

Description

Method and system for providing internet phone service for multimedia communication in high speed wireless internet network

The present invention relates to an Internet phone system and method for multimedia communication in a high-speed wireless Internet network. In particular, a wireless LAN card or a CDMA transmission / reception module is installed in a PDA installed with WinCE 3.0 or higher, and voice is supported on an RTP / RTCP real-time transmission protocol. High-speed wireless that provides multimedia communication service through wireless LAN or CDMA network by installing codec (G.711 / G.723) and video codec (H.263) and equipped with H.323 signal processing protocol. An internet phone system and method for multimedia communication in an internet network.

In general, Voice over Internet Protocol (VoIP) is an Internet telephony technology that transmits voice and data through the Internet, and is a core technology for providing a voice communication function by packet switching. Unlike in the past, where a network for sending and receiving data and a network for sending and receiving data have been operated separately, VoIP technology has the advantage of reducing costs by consolidating voice and data into a single network and building a simple network structure. . In addition, VoIP technology provides Internet Telephony, which enables users to use the high cost of long-distance calls such as long distance calls and international calls anywhere in the world at no cost or free of charge.

Currently, international standards related to VoIP are based on ITU-T's H.323, IETF Session Initation Protocol (SIP), Media Gateway Control Protocol (MGCP), and H.248 / Megaco, and each protocol standard is functionally H .323 and SIP are for enterprise and home use. MGCP and H.248 / Megaco are carrier call agents and will exist between each gateway, and for some time each of these standards is expected to coexist.

1 shows a conventional VoIP service protocol stack.

The transmitting side captures audio from the microphone and compresses the uncompressed frame through the encoder, and stores the compressed frame in the encoder output buffer to form an RTP packet of a lower layer. By using TCP / UDP / IP, the IP packet is sent to the network by sending it to the transmit queue, and the packet data is composed of RTP packets of the lower layer through the application's packet function to use TCP / UDP / IP. IP packets are sent to the network in a transmit queue.

When the receiver receives voice data, the receiver receives the received voice data from the network layer and stores the received voice data in a receive queue, and then stores the RTP packet through the IP layer, the TCP / UDP layer, and the RTP layer in the decoder input buffer. ), Then restore the compressed frame through the decoder and play the reconstructed frame through the speaker. When the receiver receives the packet data, the packet data received from the network layer is received and stored in the receive queue, and the RTP packet is decoded through the IP layer, the TCP / UDP layer, and the RTP layer through the Depacketization function. Mark in (Application).

The application fields of VoIP technology are Internet phone service that transmits and receives voice signals through the internet network, and transmits voice signals by using the internet network established in the company. All phone calls can be implemented, and the VoIP center is integrated with Call Center, which was a classic area of CTI, so that customers and counselors share 1: 1 web screens and conduct consultations through Internet phones to improve service efficiency and immediate DB. You can build a web call center that you can use.

However, the existing VoIP technology does not support the video communication function by supporting only voice communication, and only the products which are serviced only on the Internet network and the telephone network (PSTN) are released, and in the personal digital assistant (PDA) using a wireless LAN or CDMA network. There is a problem in that it is not provided and is limited to enterprise users.

The present invention has been proposed to solve the problems of the prior art, an object of the present invention is to mount a wireless LAN card or a CDMA transmission and reception module in a personal digital assistant (PDA) installed WinCE 3.0 or more on a wireless LAN, RTP / RTCP real-time Install a voice codec (G.711 / G.723) that supports voice communication and a video codec (H.263) that supports video communication on the transmission protocol, and use a wireless internet phone with the H.323 signal processing protocol. The present invention provides an internet phone system and method for multimedia communication in a high-speed wireless Internet network that provides a multimedia communication service through a VoIP gatekeeper and a VoIP gateway through a wireless LAN or a CDMA network.

1 is a conventional VoIP service protocol stack.

2 is a block diagram of an Internet phone system for multimedia communication in a high-speed wireless Internet network according to the present invention.

3 is an H.323 protocol stack installed in a PDA according to an embodiment of the present invention.

4 is an H.323 terminal structure for a video Internet phone service.

5 is a mobile Internet phone user interface screen of the PDA according to an embodiment of the present invention.

6 is a flow chart illustrating an Internet phone system and method for multimedia communication in a high-speed Internet network according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: On-premises User PDA 11: Access Point (AP)

20: VoIP Gatekeeper 21: VoIP Gateway

22: on-premises user PC 30: off-site user PDA

In order to achieve the above object of the present invention, the present invention provides a personal digital assistant (PDA) equipped with a CDMA transmission and reception module in a wireless Internet network, and a notebook provided with an access point (AP) and a wireless LAN card in a wireless LAN. In a system using a PDA and VoIP gateway and a VoIP gatekeeper: a laptop installed with the wireless LAN card, a WinCE-based PDA, or a WinCE-based PDA equipped with a CDMA transceiver module on a TCP / IP / RTP / RTCP base. A call setup step between an H.323 terminal in an Internet phone equipped with an audio codec (G.711 / G.723) and an image codec (H.263) and equipped with an H.323 signal processing protocol; After the call is set up, transmitting / receiving video / audio / text data in a point-to-point manner using the Internet phone; And disconnecting a call between the H.323 terminal between the sender and the receiver's Internet phone after transmitting and receiving the data.

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

2, the Internet phone system for multimedia communication in the high-speed wireless Internet network according to the present invention is a wireless LAN card (CF type) and the included on-premises user PDAs 10 and the access point (AP) 11 of the wireless LAN ), CDMA network and telephone network (PSTN) for VoIP gatekeeper (20), VoIP gateway (21), premises user PC (22) and geographically separated users installed in the Internet network connected to wireless LAN access point. It consists of an out-of-area user PDA 30 equipped with a CDMA transmission and reception module (CF type) for connecting to the Internet network via the network.

The VoIP gatekeeper 20 uses the H.225 Registration Admission Status (RAS) signal between the endpoint and the gatekeeper from the VoIP client to register, accept, and status information of the client. It provides point-to-point multimedia conference management. The VoIP gatekeeper 20 converts a call control signaling, a call authorization, a call management, a call management, a BW reservation, a directory service function, and an alias name into a transport address. Address translation, Admission control allowing network access using ARQ / ACF / ARJ H.225.0, Bandwidth control using BRQ / BRJ / BCF, Managed by a single gatekeeper It provides zone management, which is a collection of all H.323 terminals, VoIP gateways, and MCU (Multipoint Control Unit).

The VoIP gateway 21 provides an IP network interface, a PSTN network interface, a DSX-1 telephony interface, a 100Base-T Ethernet interface, and the like to provide interoperability with an IP network and a telephony network. 0-9, *, #, ABCD), voice codec such as G.711, G.722, G.723.1, G.728, G.729, and audio signal processing.

3 illustrates an H.323 protocol stack installed in a PDA according to an embodiment of the present invention. Digital data from an audio / video device is encoded as block data in the Realtime Transport Protocol (RTP) protocol, respectively, and transmitted to the UDP layer. RTCP performs synchronization control between group members during group communication. The H.225.0 protocol stack contains both the Q.931 call processing protocol and the RAS protocol. The Q.931 protocol contains messages for establishing the actual data channel between users authenticated by the RAS protocol. The H.245 protocol performs tradeoffs between the available bandwidth and functions between terminals in video conferencing and session control in the case of multilateral communication.

4 shows an H.323 terminal structure for a video Internet phone service. The structure of an H.323 terminal such as a WinCE-based PDA equipped with an H.323 protocol stack and a notebook and a computer equipped with an H.323 protocol stack is shown in FIG. 4.

User data consists of audio / video / text-based data (whiteboard).

The signal input from the Video / Audio input device is transmitted to video codecs H.261 and H.263 for video, and to audio codecs G.711 and G.723.x for audio.

Text-based data is encoded and transmitted according to the T.120 specification. Before user data is transmitted, media terminals negotiate by H.245 between end terminals, and RAS processing and call setup data is transmitted by H.225. This creates a logical data channel at the H.225.0 layer, which establishes the path through which user data can be transmitted. The user data is transmitted to the end system through this path. When the communication is completed, the logical channel for user data is removed by H.245 and H.225.0 protocols according to the call termination procedure.

Figure 5 shows a mobile Internet phone user interface screen of the PDA according to an embodiment of the present invention. Internet phone user interface screen installed in WinCE based PDA is DTMF tone providing screen such as numbers (0-9), special characters (*, #), Sen / End button, Clear button, Redial button, H. 263 Video display screen by algorithm, Call Status Display such as busy / call connection / disconnection, Mic / Speaker Volume Control bar, Address Book management function, Conversation Record / Play function Whiteboard chat, etc. are provided. Configure the GUI with embedded C ++ to support the H.323 standard on PDAs with the WinCE operating system, and enable endpoint-to-endpoint communication of H.323 terminals with the H.323 protocol stack on WinCE-based PDAs. It provides Caller ID Service with various calling features such as ID, Email, IP Address, Phone number (E.164) in point-to-point method.

6 is a flowchart illustrating a wireless internet phone system and method for multimedia communication in a high-speed wireless LAN according to an embodiment of the present invention.

Create a user call in the Internet phone of the PDA (step S1), check whether it is a wireless LAN connection area (step S2), connect to a CDMA network if not in a wireless LAN connection area (step S3), and change to a general user call (step S4) Call transfer (step S5). If the wireless LAN area is connected to the VoIP gatekeeper (step S6), after user authentication processing with ID and Passwd (step S7), the unique number is transmitted to another terminal (H.323 terminal) (step S8), and the number system It parses (step S9) and checks whether the subscriber is a premises (step S10).

If the subscriber is not in the premises, the call is transmitted to the VoIP gateway (step S11), the call is connected to the PSTN network (step S12). If the subscriber is the premises subscriber, the assigned IP address is retrieved (step S13) and the mapping address is checked (step S14). ) If the mapping address does not exist, a failure handling message is transmitted (step S15). If the mapping address exists, a call is transmitted to the wired / wireless access device (step S16) and the point-to-point method between both ends of the H.323 terminal. The video / audio / text data is transmitted / received between the transmitter and the receiver (S17), and then the call is disconnected (step S18).

Therefore, point-to-point Phone-to-PC, PC to Phone, Phone to Phone using Internet phone in PDA equipped with CDMA transmission / reception module or wireless LAN card in wireless internet network or wireless LAN network By using the Internet phone that supports the mode, it supports the user's mobility environment and can talk with the face of the other party anytime, anywhere.

As described above, the Internet phone system and method for multimedia communication in the high-speed wireless Internet network according to the present invention overcomes the disadvantage that the existing VoIP technology does not support the video communication function by supporting only voice communication. Point-to-point phone-to-point, phone-to-point, and phone-to-phone modes are supported using an Internet phone from a PDA equipped with a CDMA transceiver module or a wireless LAN card. By using it, it is possible to provide better wireless internet video internet phone service because it supports user mobility environment and can talk to the other party's face anytime, anywhere.

Claims (4)

In a wireless Internet network, a personal digital assistant (PDA) equipped with a CDMA transmission / reception module and a notebook or PDA equipped with an access point (AP) and a wireless LAN card in a wireless LAN, or a system using a VoIP gateway and a VoIP gatekeeper. In: Voice codec (G.711 / G.723) and video codec (based on TCP / IP / RTP / RTCP) in a laptop installed with the wireless LAN card or a WinCE-based PDA or a WinCE-based PDA equipped with a CDMA transceiver module. A call establishment step between H.323 terminals in an Internet phone having H.263 installed and equipped with an H.323 signal processing protocol; After the call is set up, transmitting / receiving video / audio / text data in a point-to-point manner using the Internet phone; And And disabling a call connection between an H.323 terminal between the sender and the receiver's Internet phone after transmitting and receiving the data. The method of claim 1, The call setup step Create a user call in the Internet phone of the PDA (S1) and check whether it is a wireless LAN connection area (S2), if not in a wireless LAN connection area, connect to a CDMA network (step S3) and change to a user general number (S4) Transmitting (S5); If the wireless LAN area is connected to the VoIP gatekeeper (S6), after the user authentication process by ID, Passwd (S7) and transmits the unique number to another terminal (H.323 terminal) (S8), the number system is parsed (S9) checking whether the subscriber in the premises (S10); And If the subscriber is not in the premises, the call is transmitted to the VoIP gateway (S11), and the call is co-transmitted to the PSTN network (S12). If it does not exist, and transmits a failure processing message (S15) and if the mapping address exists, the step of transmitting a call to the wired or wireless access device (S16), characterized in that the Internet phone service providing method for a multimedia communication in a high-speed wireless Internet network. The method of claim 1, The internet phone DTMF tones such as numbers (0-9), special characters (*, #), Sen / End button, Clear button, Redial button of Internet phone, video display screen by H.263 algorithm, busy / call connection Call Status Display, Mic / Speaker Volume Control Bar, Address Book Management, Conversion Record / Play Function, Whiteboard Chat, WinCE-based PDA In order to support endpoint-to-endpoint communication of H.323 terminal equipped with H.323 protocol stack, ID, Email, IP Address, Phone number (E.164), etc. A method of providing a multimedia communication internet phone service in a high-speed wireless internet network, comprising providing a caller ID service having calling features. The method of claim 1, The internet phone Voice codec (G.711 / G.723) and video codec equipped with wireless LAN card or CDMA transmission / reception module in WinCE 3.0 or higher PDA and supporting voice communication on RTP / RTCP real-time transmission protocol over UDP / TCP / IP. A method of providing an Internet phone service for multimedia communication in a high-speed wireless Internet network, characterized by installing (H.263) and mounting an H.323 signal processing protocol.