KR100661857B1 - Communication system based on ip using identifier and method thereof - Google Patents

Abstract

An IP-based communication system using an ID(IDentification) and a communication method thereof are provided to efficiently use resources and to revitalize many supplemental services by allocating arbitrary IP addresses to DSL(Digital Subscriber Line) users effectively and dynamically. An IP-based communication system using an ID consists of a calling user terminal(101), a proxy server(102), a NAS(Network Access Server)(103), and a DSL user terminal(104). The calling user terminal(101), connected to the Internet, makes a request for connection with the DSL user terminal(104), connected to a DSL network, by using a SIP(Session Initiation Protocol) message. The proxy server(102) is an intermediary node for sending the SIP message to the destination. The NAS(103), receiving the service request, allocates an arbitrary IP address to the termination point of the corresponding DSL user side, and connects the Internet with the DSL network. The DSL user terminal(104) executes a DSL transmission function, a SIP terminating function, and an IP address management function, and communicates with the calling user terminal(101) bi-directionally.

Description

Communication System Based on IP Using Identifier And Method Thereof}

1 is a diagram illustrating an example of a conventional SIP message structure;

2 is a block diagram showing an IP-based incoming communication system using an identifier according to an embodiment of the present invention;

3 is a flowchart illustrating an IP-based incoming communication method using an identifier according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

101: calling user terminal 102: PS_A

102a: Database of PS_A 103: PS_B

103a: Database of PS_B 104: DSL User Terminal

105: subscriber line

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system based on an internet protocol (hereinafter referred to as 'IP') using an identifier and a communication method thereof, and more particularly to a digital subscriber line using an internet service. The present invention relates to an IP-based communication system using an identifier capable of providing an incoming Internet service to a subscriber and a communication method thereof.

More specifically, the present invention provides an incoming packet by assigning a temporary IP address to a specific digital subscriber line user who has not been assigned a separate fixed IP address using a separate identifier, such as a phone number already assigned for telephone service. Enable data provision services.

In general, DSL service is a service network that popularizes broadband Internet access service, and plays an important role in establishing and utilizing high-speed Internet. Examples include Asymmetric Digital Subscriber Line (ADSL), Very High-Data Rate Digital Subscriber Line (VDSL), High-Bit-Rate Digital Subscriber Line (HDSL), Rate Adaptive Asymmetric Digital Subscriber Line (RADSL).

There are 1p (pair) of copper lines between regular homes and small businesses and telephone offices. The telephone service is designed to exchange voice information with other telephone users. The type of signal used for this kind of transmission is called an analog signal. An input device such as a telephone receives a sound signal, and then converts the received sound signal into a volume and tone form and an equivalent electric signal. Since the telephone company's signaling system is set up for this analog wave transmission, it is easy to use it as a method of transmitting and receiving analog information between the telephone and the telephone company. However, computers recognize digital signals, not analog signals. Therefore, a modem for modulating an analog signal into a digital signal is required for communication between a telephone company and a computer.

The modem can modulate the analog signal and change its value into a series of zeros and ones of digital signals. Because data transmission over a regular modem uses only a fraction of the available bandwidth that copper has, the maximum amount of data that can be transmitted using a regular modem is approximately 56 Kbps.

DSL allows for greater use of bandwidth to deliver digital data to users. In addition, a portion of the bandwidth can be used for analog signal transmission, depending on the user's choice, allowing the phone and computer to be used simultaneously on a single line.

In order for DSL to be connected to a user, Internet Service Providers (ISPs) install DSL equipment at their local central offices (COs) and use DSL modems. Should be installed in place. The DSL modem connects the user's computer to the server through a local telephone line, and the connection is made by the DSLAS (Digital Subscriber Line Access Multiplexer) within the CO and CO inside the SP. . DSLAM collects the circuits and uplinks them to the network access server (Network Access Server, hereinafter referred to as NAS), which is an integral part of the network. At this point, the Internet service provider for the DSL connection An ISP connects the DSL to the Internet.

One such signaling protocol used for Internet-based services is the Session Initiation Protocol (SIP) announced by the Internet Engineering Task Force (IETF). SIP is a representative example of a signaling protocol for creating, modifying and terminating a multimedia session between multiple users on an IP network. The signaling protocol plays a role of exchanging information for controlling a message session between subjects to exchange messages.

Next, the SIP message structure will be described with reference to FIG.

1 is a diagram illustrating an example of a conventional SIP message structure.

SIP uses SIP URIs (Uniform Resource Identifiers), similar to E-mail Addresses, to distinguish users and provide services to users without being dependent on IP addresses.

As shown in FIG. 1, a request method and a SIP URI are located in a start line 10, and values for controlling a session are set in a message header 20. The message body 30 contains contents of a type set in the content-type of the message header 20.

The most common command that SIP sends to other endpoints is Invite. The SIP telephone sends an invite command when the UA (User Agent) wants to connect to another SIP telephone or UA. If the invitation is successful, a response of '200 OK' is returned to the origination point, which means that everything is in good condition and the session is established.

The message header 20 of the SIP includes 'to' and 'from' addresses similar to email messages with bytes. These addresses are called URIs and are 'jane@aaa.com' and 'tom@bbb.com' shown in FIG. Also, the 'Call-ID' field is a unique number that identifies the SIP transaction, the 'Via' field is the IP address to use to send a response to the UA upon initial connection negotiation, and the ' The 'Contact' field indicates the destination that the receiving UA uses when talking to the sending UA. Since SIP is a well-known technique commonly used in the art, more detailed description thereof will be omitted.

Some SIP phones can call each other directly, but require a server if you want scalability. SIP servers keep track of directory information and the location of called groups. SIP servers include SIP Proxy Servers and SIP Redirect Servers, both of which can run on the same server or on its own hardware platform.

The proxy server receives SIP call from UAC (User Agent Client) and makes a call instead.The direction server receives SIP call from UAC and receives UAS (User) Agent Server (User Agent Server) to inform the address. This allows UAC to call the UAS directly. Here, both UAC and UAS are elements that act as clients participating in SIP calls. Because UAC is the client requesting the call and UAS is the client accepting the call, UAC and UAS are not really meaningful. Thus, the UA may be UAC in some cases and sometimes UAS. In other words, if he attempts to make a call, it becomes UAC, and when someone receives a call, it becomes UAS.

When the proxy server receives an invite request from the sending UA, it immediately returns a status message of '100 Trying'. This message informs the sending UA that it is working on a request for a job. Next, the proxy server locates the receiving UA and sends an invite, and then sends a message of '180 Ringing' to the sending UA. The receiving UA sends a '200 OK' response to the proxy server while responding, and the proxy server receives the '200 OK' message to the sending UA. The originating UA notifies the caller that it has received a '200 OK' by sending an 'ACK' response to the receiving UA. All subsequent communication takes place between UAs, and the Real-time Transport Protocol (RTP) is responsible for digitized audio transmission between UAs. When the calling of the sending UA is completed, a 'Bye' message is sent to the receiving UA, and the receiving UA ends the session by responding to the sending UA with '200 OK'.

So far, DSL users have only one incoming and outgoing telephone service using their assigned Public Switched Telephone Network (PSTN) phone number and an outgoing Internet service using dynamic Internet address (IP address) assignment. Has been provided. In other words, the incoming Internet service was not generally provided, and in order to receive the incoming Internet service, the ISP had to be paid a separate fee and assigned a fixed IP address. Therefore, the type of Internet service that can be provided by DSL is limited to DSL user originating service.

Looking at the procedure of such an outgoing service, a DSL user first requests an ISP's NAS to assign an IP address, and as a result, a temporary IP address is assigned. Next, start the outgoing service using the assigned temporary IP address. When the service is terminated, the DSL user returns the assigned IP address to the network device and disconnects from the Internet.

Therefore, in the prior art, when another user on the Internet wants to call a DSL user disconnected from the Internet, there is a problem that the call cannot be made because there is no IP address for identifying the DSL user.

In addition, there is a method of allocating a fixed IP address from an ISP in order to solve the above callability problem, but the service fee increases due to additional costs, and there is a problem that the IP resource of the current IP is limited.

An example of an incoming call processing technology in an Internet access service is disclosed in Korean Patent Laid-Open Publication No. 2004-0019768 (published on March 6, 2004, an incoming call processing system and method in an internet access service).

The technique disclosed in Korean Patent Publication No. 2004-0019768 discloses whether an IP address is allocated to a called subscriber terminal when a calling subscriber terminal connected to a service server providing a VoIP service through the Internet requests the VoIP service. A first process of determining a second process, a second process of assigning an IP address using a telephone call if the IP address of the called subscriber station is not assigned, and the service server using the IP address allocated through the second process The third step is to connect the VoIP call to the called subscriber terminal, and it is described that the incoming call processing is possible even when the subscriber using the Internet access service is not connected to the Internet.

However, in the technique disclosed in Korean Patent Publication No. 2004-0019768, the caller first requests a DSL user to be assigned a temporary IP address using a public telephone network (PSTN), and then uses the same to enable an incoming call. PSTN was involved, complicated procedures such as additional functions were required for the user terminal, and hardware was added.

In addition, there was a problem that the destination of the incoming service is limited to the incoming service of the Internet telephone.

An object of the present invention is to solve the problems described above, the DSL company that the other user on the Internet is disconnected from the Internet by using a separate identifier, such as a telephone number that is already assigned to the DSL user for the telephone service The present invention provides an IP-based communication system using an identifier capable of calling a user and a communication method thereof.

Another object of the present invention is to provide an IP-based communication system using an identifier capable of providing an incoming service even to a DSL user who does not have a fixed IP and a communication method thereof.

Another object of the present invention is to provide an IP-based communication system using an identifier capable of providing various incoming services using the Internet to a DSL user without the intervention of a public telephone network (PSTN), and a communication method thereof.

In order to achieve the above object, an IP based communication system using an identifier according to the present invention includes a second terminal called from a first terminal connected to an IP network and connected to a DSL network, and the first terminal having an identifier preset in the second terminal. When the second terminal is called using the server, the server may be configured to connect the first terminal and the second terminal by assigning an IP address to the second terminal using the identifier.

In addition, in an IP-based communication system using an identifier according to the present invention, the server is connected to the second terminal and allocates an IP address to the second terminal using the identifier to connect the IP network and the DSL. And a second server of an IP network that analyzes the identifier to identify a location of the first server, wherein the second server calls the second terminal by the first server. Characterized in that the communication with the terminal.

In addition, in the IP-based communication system using the identifier according to the present invention, the second server is characterized in that the proxy server.

In the IP-based communication system using the identifier according to the present invention, the first server functions as a proxy server function on the IP network side and a network access server function on the DSL network side.

In addition, in the IP-based communication system using the identifier according to the present invention, the identifier is characterized in that the telephone number assigned to the second terminal.

In addition, in the IP-based communication system using the identifier according to the present invention, the identifier is characterized in that the ID (Identification, ID) received from the Internet service provider (Internet Service Provider) subscribed to the second terminal.

In order to achieve the above object, an IP-based communication method using an identifier according to the present invention includes a server for allocating an IP address so that a first terminal connected to an IP network and a second terminal connected to a DSL communicate with each other and provide an incoming data service. The method of claim 1, wherein the server (a) receives a DSL user incoming service request from the first terminal, (b) analyzes the identifier of the DSL user included in the request to identify the location of the second terminal (C) allocating an IP address to the second terminal using the identifier, (d) transmitting the IP address to the second terminal, (e) acknowledging the IP address from the second terminal Receiving a message, (f) transmitting the IP address to the first terminal, (g) a call for communication connection between the first terminal and the second terminal The step of relaying the re, (h) characterized by executing the steps of the first terminal and the second terminal communicate in both directions.

In addition, in the IP-based communication method using the identifier according to the present invention, the server is a first server for executing the step c, d and e and a second server for performing the steps a and b Server, wherein the second server transmits the request to the first server to which the second terminal is connected after executing step b; and the steps f, g and h are performed by the second server. And the first server relays and executes the first server.

In the IP-based communication method using an identifier according to the present invention, the second server is characterized in that the proxy server.

In the IP-based communication method using an identifier according to the present invention, the first server functions as a proxy server function on the IP network side and a network access server function on the DSL network side.

In addition, in the IP-based communication method using the identifier according to the present invention, the identifier is characterized in that the telephone number assigned to the second terminal.

In addition, in the IP-based communication method using the identifier according to the present invention, the identifier is characterized in that the ID given from the Internet service provider subscribed to the second terminal.

The basic concept of the present invention is that the sender requests that the NAS of the ISP to which the DSL user is connected assigns a temporary IP address to the DSL user using the identifier of the DSL user. The NAS receives such a request from the sender and uses a point-to-point protocol (hereinafter referred to as 'PPP') or a dynamic host configuration protocol (hereinafter referred to as 'DHCP'). Assign addresses to DSL users. The NAS also notifies the sender of the allocation information. Using this assigned IP address, Internet communication service between sender and user is possible. That is, in case of providing outgoing service to DSL user, DSL user requests IP address allocation to NAS, but in the case of incoming service, caller requests NAS to assign IP address to DSL user.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2 is a block diagram illustrating an IP-based incoming communication system using an identifier according to an embodiment of the present invention.

As shown in FIG. 2, an IP-based incoming communication system using SIP and PPP is a terminal that is connected to the Internet and attempts to access a DSL user. Various existing methods are applied in connection with the Internet. Positioning procedure as an intermediate node that delivers SIP messages received from the originating user terminal 101 and the originating user terminal 101 to the destination, the first terminal requesting connection to the DSL subscriber using the SIP message to the Internet. PS (Proxy Server, Proxy Server; 102) which is a second server to relay the message to the destination by receiving the service request and assigns a temporary IP address to the corresponding DSL user end point to provide the PS 102 NAS (Network Access Server, 103) which is the first server connecting the Internet and DSL, DSL transmission function and DSL user-end termination function of SIP, It consists of a DSL user terminal 104, which is a second terminal that performs an IP address management function and communicates with the calling user terminal 101 in both directions.

In addition to the SIP PS function, the NAS 103 shown in FIG. 2 performs a connection function between the Internet and DSL as a component of a DSL network. That is, the NAS 103, which is the first server, serves as a PS in terms of SIP as an IP network and also as a NAS in terms of a DSL network. The NAS 103 not only allocates a temporary IP address by receiving an IP address allocation request from a DSL user as in the conventional art, but also receives a request of a calling user terminal 101 as a sender and assigns a temporary IP address to a DSL subscriber. It also performs the function of assigning to the user DSL 104. In addition, a temporary IP address is allocated using a separate identifier that can distinguish the DSL user terminal 104.

In general, the DSL user terminal 104 is assigned a telephone number of a public telephone network (PSTN) as an identifier, and if a telephone number is not assigned, a separate identifier may be allocated according to the policy of the ISP. An ID other than a phone number granted from an ISP (Internet Service Provider) to which the DSL user terminal 104 is subscribed may also be an identifier.

As mentioned above, since the NAS 103 also performs the function of the PS, the PS 102 is referred to as 'PS_A 102', and the NAS 103 is referred to as 'PS_B 103'.

Next, an IP-based incoming communication method using an identifier according to an embodiment of the present invention will be described with reference to FIG. 3.

3 is a flowchart illustrating an IP-based incoming communication method using an identifier according to an embodiment of the present invention.

As shown in FIG. 3, first, the calling user terminal 101 transmits an invite message requesting a DSL user incoming service to the PS_A 102 (ST 3010). The message includes the telephone number of the DSL user terminal 104 used by the destination DSL user who wants to connect or another corresponding identifier in the form of an e-mail address. That is, the destination address of the invite message becomes the IP address of PS_A 102, and the destination DSL user identifier is included in the message in the form of a SIP URI. For example, if the identifier is a telephone number '02 -222-3333 'already assigned to a DSL user for a telephone service, and the DSL user is a subscriber of' KT ', the SIP included in the invite message The incoming DSL user identifier, which is a URI, may be the same as '022223333 @ KT'.

After receiving the message, the SIP PS_A 102 analyzes the called phone number or other identifier to confirm the location of the called DSL user, and then relays the invite message to the PS_B 103 to which the called party is connected (ST 3020). That is, the IP address of the PS_B 103 to which the called party is connected is identified by using all or part of the called DSL user identifier. Part of the DSL user identifier is, for example, '02222 @ KT'. Here, the incoming DSL user identifier and the corresponding IP address of the PS_B 103 exist inside the PS_A 102 in the form of a database 102a, and the service provider (in this case, 'Korea Telecom') is PS_A ( The content of the database 102a in the 102 is managed. After confirming the location of the PS_B 103, the PS_A 102 sends an invite message to the PS_B 103 using the IP address of the PS_B 103. Within the invite message, the final DSL user identifier is also present in the form of a SIP URI. After executing step ST 3020, the PS_A 102 transmits a status message of '100 Trying' to the calling user terminal 101, which is the caller (ST 3030). The '100 Trying' message is a message that informs the caller that he or she is working on a request for a job.

Next, the PS_B 103 receives an invite message from the PS_A 102 and transmits a '100 training' message to the PS_A 102 to check the current state (ST 3040). In the conventional SIP call processing procedure, the PS_B 103 maps the telephone number which is the called party identifier and the called party IP address in the next step, but in the present invention, since the IP address to be mapped is not yet given, the PS_B 103 is the NAS. It serves as. That is, the PS_B 103 checks the location of the corresponding destination DSL user terminal 104 and starts a procedure of allocating an IP address using the destination phone number or another identifier (ST 3050). In other words, the PS_B 103 serves as a NAS from the perspective of the DSL network, and the DSL users are connected to the ports of the NAS 103. In fact, the port may take many forms depending on the actual physical configuration of the DSL network. The PS_B 103 receives the invite message from the PS_A 102 and identifies the specific port to which the incoming DSL user is actually connected. The specific DSL user identifier (022223333) and the corresponding specific port number exist in the PS_B 103 in the form of the database 103a, and the service provider (in this example, 'Korea Telecom') is PS_B ( The content of the database 103a of the server 103 is managed. Thereafter, step ST 3050 is performed in which an IP address is allocated to a called party through the specific port.

3 shows an example of using PPP, but it is also possible to use DHCP, in which case a DHCP server may exist separately. The temporary IP address is assigned to the DSL user terminal 104 in step ST 3050, and the PS_B 103 sends an invite message to the DSL user terminal 104 of the destination DSL user using the IP address (ST). 3060). The PPP message of step ST 3050 and the invite message of step ST 3060 are transmitted through the existing subscriber line 105. Although there is a digital subscriber line multiplexer (DSL Access Multiplexer) between the PS_B 103 and the DSL user terminal 104, a detailed description thereof will be omitted since the present invention merely performs a signal transmission role.

When the DSL user terminal 104 receives the invite message of the ST 3060 using the IP address assigned through the ST 3050, the DSL user terminal 104 receives the reception status to the calling user terminal 101 through the PS_B 103 and the PS_A 102. Ali sends a '180 Ringing' message (ST 3070). The DSL user terminal 104 also transmits information on the assigned IP address to the calling user terminal 101 through step ST 3070. In addition, the DSL user terminal 104 informs the DSL user that the call has arrived by using appropriate display means. Now, PS_A 102 and PS_B 103 relay call processing for communication connection between originating user terminal 101 and DSL user terminal 104. The DSL user responds to the '180 ringing' message via the DSL user terminal 104 (e.g., when the handset is hooked off) and sends a '200 OK' message to the intermediate node PS_A 102. And the state is notified by transmitting to the DSL user terminal 104 via the PS_B 103 (ST 3080). The calling user terminal 101 transmits an 'ACK' message to the '200 OK' message (ST 3090). Thereafter, full-duplex two-way internet communication is performed between the calling user terminal 101 and the DSL user terminal 104 using the IP address assigned to the DSL user terminal 104 (ST 3110). The automatic response or various types of services may be provided according to the capabilities of the DSL user terminal 104.

The present invention can be applied to the Internet in the field of information industry or can be applied to network devices and subscriber terminal devices for the Internet. In addition, as a function required for general Internet subscribers, it can be widely used as it can serve as a catalyst for creating new application services.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, it can be variously changed in the range which does not deviate from the summary.

As described above, according to the IP-based communication system and the communication method using the identifier according to the present invention, by effectively and dynamically allocating a temporary IP address to DSL users occupying most of the high-speed Internet and using the temporary IP address The effect of using resources efficiently and pursuing activation of various additional services is obtained.

In addition, according to the IP-based communication system using the identifier according to the present invention and a communication method, a DSL user whose other user on the Internet is disconnected from the Internet by using a separate identifier that can distinguish the DSL user, such as a telephone number The effect of being able to call is also obtained. Therefore, using the system and method according to the present invention, a particular subscriber 'A' on the Internet can make an Internet call to 'B' or start a home automation service over the Internet using the phone number of another DSL user 'A'. have.

In addition, according to the IP-based communication system using the identifier and the communication method according to the present invention, it is also possible to provide a variety of incoming services using the Internet to DSL users without a fixed IP or public telephone network (PSTN).

In addition, according to the IP-based communication system using the identifier and the communication method according to the present invention, the effect can be extended to data services in various IP-based Inter or Intra Packet Networks other than the Internet Is also obtained.

Claims (12)

A second terminal called from a first terminal connected to an IP (Internet Protocol) network and connected to a digital subscriber line (DSL) network; When the first terminal calls the second terminal using an identifier preset in the second terminal, the first terminal allocates an IP address to the second terminal using the identifier to connect the first terminal to the second terminal. IP-based communication system using the identifier, characterized in that it comprises a server. The method of claim 1, The server is A first server connected to the second terminal and connecting the IP network and the DSL by assigning an IP address to the second terminal using the identifier; A second server of the IP network for analyzing the identifier to determine the location of the first server, The second server is an IP-based communication system using an identifier, characterized in that the first server to call the second terminal to communicate with the first terminal. The method of claim 2, IP-based communication system using an identifier, characterized in that the second server is a proxy server. The method of claim 2, The IP-based communication system using an identifier, wherein the first server serves as a proxy server function on the IP network side and a network access server function on the DSL network side. The method according to claim 1 or 2, The identifier is an IP based communication system using an identifier, characterized in that the telephone number assigned to the second terminal. The method according to claim 1 or 2, The identifier is an IP-based communication system using an identifier, characterized in that the ID (Identification, ID) received from the Internet service provider (Internet Service Provider) subscribed to the second terminal. A method of providing an incoming data service, comprising: a server for allocating an IP address for communication between a first terminal connected to an IP network and a second terminal connected to a DSL; The server is (a) receiving a DSL user incoming service request from the first terminal; (b) identifying a location of the second terminal by analyzing an identifier of a DSL user included in the request; (c) assigning an IP address to the second terminal using the identifier; (d) transmitting the IP address to the second terminal; (e) receiving an IP address acknowledgment message from the second terminal; (f) transmitting the IP address to the first terminal; (g) relaying call processing for communication connection between the first terminal and the second terminal, (h) an IP-based communication method using an identifier, characterized in that the step of communicating between the first terminal and the second terminal in both directions. The method of claim 7, wherein The server comprises a first server for performing the steps c, d and e, and a second server for performing the steps a and b, The second server sends the request to the first server to which the second terminal is connected after executing step b; And the steps f, g and h are executed by relaying between the second server and the first server. The method of claim 8, IP-based communication method using the identifier, characterized in that the second server is a proxy server. The method of claim 8, And the first server functions as a proxy server on the IP network side and a network access server function on the DSL network side. The method of claim 7, wherein The identifier is an IP-based communication method using an identifier, characterized in that the phone number assigned to the second terminal. The method of claim 7, wherein The identifier is an IP-based communication method using an identifier, characterized in that the ID given from the Internet service provider subscribed to the second terminal.

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