KR20040044216A - Method for establishing tcp/ip session using extended session initiation protocol for peer to peer service between communication terminals - Google Patents

Abstract

PURPOSE: A method of setting a TCP/IP session using an expanded SIP for a service of a peer-to-peer system between communication terminals is provided to set a TCP/IP session between wireless mobile stations, and to supply an application service basis with a peer-to-peer system between the wireless mobile stations, thereby reliably transmitting data. CONSTITUTION: An originating wireless mobile station(10) transmits an invite message to an SIP server(100)(S101). A location registration server(200) transmits obtained position information of a terminal to the SIP server(100)(S102). The SIP server(100) forwards the invite message to a receiving wireless mobile station(20)(S104). The receiving wireless mobile station(20) transmits a '200 OK' message to the SIP server(100) as a response to the invite message(S105). The SIP server(100) forwards the '200 OK' message to the originating wireless mobile station(10)(S106). The originating mobile station(10) transmits an ACK(Acknowledgement) message to the SIP server(100)(S107). The SIP server(100) forwards the ACK message to the receiving mobile station(20)(S108). The receiving mobile station(20) performs a TCP/IP connection procedure(S109). The originating mobile station(10) transmits a synchronous ACK packet(S110). The receiving mobile station(20) transmits an ACK packet to the originating mobile station(10)(S111). A TCP/IP session is set between the mobile stations(10,20).

Description

METHOD FOR ESTABLISHING TCP / IP SESSION USING EXTENDED SESSION INITIATION PROTOCOL FOR PEER TO PEER SERVICE BETWEEN COMMUNICATION TERMINALS}

The present invention relates to a method for establishing a TCP / IP session using an extended session initiation protocol (SIP) for a peer-to-peer service. The extended SIP referred to herein is a protocol that contains information for TCP / IP session establishment and application application information in the existing SIP, which means that the existing SIP is extended according to the present invention.

In the past, second-generation or 2.5-generation CDMA (Code Division Multiple Access) wireless networks provided voice-oriented services, whereas in the current third-generation wireless networks, the need for high-speed multimedia services is emerging. In the 3G wireless network environment, SIP is adopted as a communication standard for voice and high-speed multimedia services.

The client-server model, the current method of communicating over the Internet, has grown in size since 1994, resulting in bandwidth shortages and allowing anyone, not just one particular person, to use resources on the Internet.

However, the society has a urge to freely communicate with more specialized and specialized groups, and the need for research on peer-to-peer has emerged as a way to overcome them.

On the other hand, when looking at the Internet content, the majority is based on TCP / IP, and as in the case of the client-server model, when a client requests information, the server responds to the server and provides the corresponding information.

While this has the advantage of easy management of clients on the server, it causes server overload and ensures uniformity of dictionary information such as IP address, port, software, etc. There is a problem with the service.

In the meantime, the SIP protocol proposed by the IETF (International Engineering Task Force) makes it easy to find the location of the terminal while accepting the current Internet network, and to easily set up the call in Voice over IP (VoIP). Because of this, a lot of research is going on.

Currently, discussions have been made about the interworking between wireless mobile terminals, Internet networks, mobile communication networks, and public switched telephone networks (PSTNs) according to the SIP protocol. In the case of services using such networks, most of them are for real-time services. As the real time service method, there is an Internet phone service, a video communication, and the like.

Conventionally, many services on a wired line are made through TCP / IP. For example, the Korean Patent Application Publication No. 10-2000-0012166 discloses an Internet phone service system using a public switched network terminal and a method thereof. have. This patent relates to an Internet phone service system using a terminal connected to a public switched network (PSTN, ISDN), and operates an Internet phone according to a user's call origination request, sends the information to a server, and then After the information exchange with each other depending on whether the driving can communicate with each other through the Internet phone. But it basically refers to a wired Internet phone service.

Therefore, there is a need for a new method for establishing a peer-to-peer TCP / IP session in a wireless communication system using a SIP protocol in which each terminal operates as a client / server.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a peer-to-peer application application service base between wireless mobile terminals by establishing a TCP / IP session between wireless mobile terminals using an extended SIP message. There is a purpose.

Another object of the present invention is to provide a method for establishing a TCP / IP session between a wireless mobile terminal and a fixed terminal of an Internet network using an extended SIP message.

Another object of the present invention is to provide a method for establishing a TCP / IP session through an extended SIP message with a wireless mobile terminal that does not access a specific server that provides out-dialing. have.

In addition, the present invention transmits information for establishing a TCP / IP session in the extended SIP message for the peer-to-peer application service in the communication terminal period to perform 3-way handshaking of the SIP message. Another object of the present invention is to provide a method for establishing a TCP / IP session after performing handshaking on a 2-way or a 2-way method for a SIP message. .

FIG. 1 illustrates an example of TCP / IP using an extension initiation protocol (SIP) for a peer-to-peer service between wireless mobile terminals according to a first embodiment of the present invention. Network diagram for establishing a session.

2 illustrates an extended SIP stack in accordance with the present invention.

3 is a diagram illustrating a network structure for establishing a TCP / IP session using an extended SIP for a peer-to-peer service between a wireless mobile terminal and a fixed terminal of an internet network according to the present invention.

4 is a diagram illustrating a network structure for establishing a TCP / IP session using an extended SIP for a peer-to-peer service between a fixed terminal and a wireless mobile terminal of an Internet network according to the present invention.

FIG. 5 is a network architecture for establishing a TCP / IP session with out-dialing functionality between wireless mobile terminals using extended SIP in accordance with the present invention. FIG.

6 is a network structure diagram for establishing a TCP / IP session through an out-dialing function using an extended SIP for a peer-to-peer service between wireless mobile terminals according to the present invention.

FIG. 7 is a diagram illustrating a network structure for establishing a TCP / IP session in a one-way manner using extended SIP for peer-to-peer service between wireless mobile terminals according to the present invention.

8 is a diagram illustrating a network structure for establishing a TCP / IP session in a 2-way manner using an extended SIP for a peer-to-peer service between wireless mobile terminals according to the present invention.

<Description of Symbols for Major Parts of Drawings>

10,20: wireless mobile terminal 30: fixed terminal

100: SIP server / PDSN 200: location registration server

300: network server

In order to achieve the above object, a method of establishing a TPC / IP session using an extended SIP for a peer-to-peer service of a communication terminal period according to a preferred embodiment of the present invention is a calling party that attempts to originate. A first step of receiving, by the wireless mobile terminal, an IP address from an IP address assignment means; The calling wireless terminal is required to set the assigned IP address, the identification number of the called wireless terminal, the TCP port number of the application running in the calling wireless terminal and the TCP / IP session setup. A second step of generating an INVITE message including information indicating and transmitting the generated message to the SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; Receiving the IP address from the IP address allocating means, generating an OK message in response to the invite message, and transmitting the generated OK message to the calling wireless terminal through the SIP server; Step 5; A sixth step of generating, by the originating wireless mobile terminal receiving the ok message, an ACK message and transmitting it to the called wireless mobile terminal through the SIP server; The called-party wireless mobile terminal uses the IP address and TCP port number of the calling-party wireless mobile terminal included in the invite message, and information indicating that a TPC / IP session is required. And a seventh step of proceeding to a connection process for establishing a peer-to-peer type TPC / IP session.

In order to achieve the above object, a method of establishing a TPC / IP session using an extended SIP for a peer-to-peer service between a wireless mobile terminal according to the present invention and a fixed terminal connected to a wired communication network is provided. A first step of receiving an IP address from an IP address allocating means by the calling wireless mobile terminal which attempts to make a call; The calling wireless terminal is assigned the IP address, the identification number of the called station fixed terminal connected to the wired communication network, the TCP port number of the application running in the calling wireless terminal and TCP / IP (TCP / IP). A second step of generating an INVITE message including information indicating that session establishment is required and transmitting it to a SIP server; Transmitting, by the SIP server, the invite message to the called party fixed terminal using the identification number of the called party fixed terminal; A fourth step in which the called party's fixed terminal generates an OK message in response to the invite message and transmits it to the calling party's wireless mobile terminal through the SIP server; A fifth step of generating, by the originating wireless mobile terminal receiving the ok message, an ACK message and transmitting it to the called party's fixed terminal through the SIP server; The called party's fixed terminal peers with the calling party's wireless mobile terminal by using the IP address and TCP port number of the calling party's wireless mobile terminal included in the invite message, and information indicating that a TCP / IP session is required. And a sixth step of proceeding to a connection process for establishing a two-peer type TPC / IP session.

In addition, to achieve the above object, a method for establishing a TPC / IP session using an extended SIP for peer-to-peer service between a fixed terminal and a wireless mobile terminal connected to a wired communication network according to the present invention, The fixed terminal connected to the wired network has its IP address, the identification number of the wireless mobile terminal of the called party, the TCP port number of the application running on the calling party's fixed terminal, and TCP / IP session settings. A first step of generating an INVITE message including information indicating that it is required and transmitting it to a SIP server; A second step of the SIP server querying a wireless mobile terminal location register based on an identification number of the called wireless terminal to obtain location information of the called wireless terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using location information of the called-party wireless mobile terminal; A fourth step in which the called-party wireless mobile terminal is assigned an IP address from an IP address allocating means, generates an OK message in response to the invite message, and transmits an OK message to the calling party fixed terminal through the SIP server; Wow; A fifth step of generating, by the originating stationary terminal receiving the ok message, an ACK message and transmitting it to the called party mobile terminal through the SIP server; The called party's wireless mobile terminal uses the IP address and TCP port number of the called stationary terminal included in the invite message, and information indicating that a TPC / IP session is required. And a sixth step of proceeding to a connection process for establishing a peer-to-peer / IP session.

In addition, in order to achieve the above object, a method for establishing a TPC / IP session using extended SIP for peer-to-peer service between wireless mobile terminals according to the present invention includes a calling party connected to a network server. A first step of the wireless mobile terminal transmitting access request information including the identification number of the called wireless mobile terminal which is not connected to the network server through a SIP server; Obtaining, by the network server, location information of the called-party wireless mobile terminal by inquiring to the wireless mobile terminal location registration means based on the identification number of the called-party wireless mobile terminal through the SIP server; The network server generates an invite message including an identification number of the called-party wireless mobile terminal, a TCP port number of an application, and information indicating that a TPC / IP session is required, and uses the location information for the invite message. A third step of transmitting to the incoming wireless mobile terminal through an SIP server; A fourth step in which the called party wireless mobile terminal is assigned an IP address by an IP address assignment means, generates an OK message in response to the invite message, and transmits the OK message to the network server through the SIP server; A fifth step of the network server receiving the OK message generating an ACK message and transmitting the generated ACK message to the called-party wireless mobile terminal through the SIP server; The destination wireless mobile terminal establishes a peer-to-peer TPC / IP session with either the network server or the originating terminal by using the TCP port number and information indicating that a TPC / IP session is required. Characterized in that it comprises a sixth step of proceeding the connection process for.

In order to achieve the above object, a method of establishing a TPC / IP session using extended SIP for peer-to-peer service between wireless mobile terminals according to the present invention includes: A first step in which the terminal is assigned an IP address from the IP address assignment means; The calling wireless terminal includes the assigned IP address, the identification number of the called wireless terminal, the TCP port number of the application running in the calling wireless terminal, and TCP / IP session establishment information. A second step of generating an INVITE message to a SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; A fifth step in which the called-party wireless mobile terminal is assigned an IP address from the IP address assignment means; The called-party wireless mobile terminal uses the IP address, TCP port number, and TPC / IP session establishment information of the calling-party wireless mobile terminal included in the invite message to peer-to-peer with the calling wireless terminal. Characterized in that it comprises a sixth step of proceeding to the connection process for establishing a TPC / IP session of the.

In addition, in order to achieve the above object, a method for establishing a TPC / IP session using extended SIP for peer-to-peer service between wireless mobile terminals according to the present invention includes: A first step in which the terminal is assigned an IP address from the IP address assignment means; The calling wireless terminal includes the assigned IP address, the identification number of the called wireless terminal, the TCP port number of the application running in the calling wireless terminal, and TCP / IP session establishment information. A second step of generating an INVITE message to a SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; The called party wireless mobile terminal is assigned an IP address from the IP address assignment means, and in response to the invite message, the assigned own IP address, the identification number of the calling party wireless mobile terminal, and the called party wireless mobile terminal. A fifth step of generating an OK message including a TCP port number and a TCP / IP session setup information of an application running in the home server and transmitting the generated OK message to the calling wireless terminal through the SIP server; ; The caller's wireless mobile terminal uses the IP address, TCP port number, and TPC / IP session establishment information of the called party's wireless mobile terminal included in the OK message, to establish a peer-to-peer type connection with the called-party wireless mobile terminal. And a sixth step of proceeding to the connection process for establishing the TPC / IP session.

Here, the TCP / IP session configuration information included in the invite message and the OK message may include a TCP port number (Transport Address), information indicating that the TCP / IP session configuration is required, an initialize sequence, It is configured to include a gent point and a window size.

In addition, the wireless mobile terminal has an integrated SIP protocol function and a TPC / IP protocol function.

In addition, the extended SIP preferably records information for establishing a TPC / IP session between wireless mobile terminals in a media description information field of an AP message.

Hereinafter, methods for establishing a TCP / IP session using an extended SIP (SIP) for a peer-to-peer service of a communication terminal period according to preferred embodiments of the present invention are attached. It will be described in detail with reference to the drawings.

1 is an example of TCP / IP using an extended Session Initiation Protocol (SIP) for a peer-to-peer service between wireless mobile terminals according to a first embodiment of the present invention. A network structure diagram for establishing a session.

Referring to the figure, the network of the first embodiment of the present invention includes a SIP server / PDSN 100, a location registration server 200, and a plurality of wireless mobile terminals 10 and 20.

The SIP server / PDSN 100 consists of a SIP server and a PDSN. The SIP server is an application server that receives and responds to a SIP request from the wireless mobile terminals 10 and 20 and is a server that provides both TCP / IP and User Datagram Protocol (UDP). In particular, in the present embodiment, a process of establishing a TCP / IP session between the originating wireless terminal 10 and the called wireless terminal 20 by forwarding an extended SIP message generated by the wireless mobile terminal to another wireless mobile terminal. To be utilized. Therefore, the SIP server according to the present embodiment is a server capable of processing not only the existing SIP but also the extended SIP according to the present invention.

In the present invention, information for establishing a TCP / IP session between the wireless mobile terminals 10 and 20 is signaled through an extended SIP message, and after the TCP / IP session is established between the wireless mobile terminals 10 and 20, the wireless mobile terminal. The TCP / IP compliant application of (10, 20) sends and receives data based on the TCP / IP session, so that the signaling message path and the media path are independent.

Therefore, the applications of the wireless mobile terminals 10 and 20 can transmit and receive various data based on the TCP / IP of the connection-oriented mode, which is more reliable than the existing UDP, and is easy to control and multiplex in flow control. Will be. The application may be a multimedia communication support program that supports voice, games, chat, and the like as a program embedded in the wireless mobile terminals 10 and 20.

In addition, the PDSN of the SIP server / PDSN 100 is a PPP for each wireless mobile terminal 10 and 20 when the wireless mobile terminal 10 attempts to connect as a calling party or when a connection is required as the called party 20. (Point to Point Protocol) establishes a connection and assigns an IP address to the wireless mobile terminals 10 and 20 so as to be uniquely identified on the Internet.

The location registration server 200 maps the telephone number of the destination wireless mobile terminal 20 to the SIP ID (ID) when the calling party wireless mobile terminal 10 specifies and dials the called party wireless mobile terminal 20. It is a server that makes the ENUM (Telephone Number Mapping) server function. Therefore, when a user attempts to make a call by specifying the called party's wireless mobile terminal 20, the user calls with the called party's wireless mobile terminal 20 without using the URL assigned to the called party's wireless mobile terminal 20. Can be set.

The ENUM server function may be omitted when an application embedded in the calling party's wireless mobile terminal 10 directly maps and generates a SIP ID including the phone number of the called party's wireless mobile terminal 20.

In addition, when the location registration server 200 receives a request for the location of the called party wireless mobile terminal 20 from the SIP server 100, the SIP server 100 provides information on the location of the called party wireless mobile terminal 20. To send. Therefore, the location registration server 200 is preferably configured to include a device or software interworking with a subscriber location registration device (HLR: Home Location Register) operating in an existing wireless mobile communication network or performs a subscriber location registration function.

The wireless mobile terminals 10 and 20 refer to personal portable wireless communication terminals, and are terminals having an extended SIP function and a client / server function of TCP / IP according to the present invention. Accordingly, the wireless mobile terminals 10 and 20 may generate an extended SIP message including TCP / IP session setting information and transmit the extended SIP message to other wireless mobile terminals 10 and 20 via the SIP server 100. By using the established TCP / IP session configuration information, it is possible to establish a TCP / IP session.

2 is a diagram illustrating an extended SIP stack according to the present invention. Referring to the figure, an extended SIP according to the present invention is based on TCP / IP, and in order to establish a TCP / IP session for a peer-to-peer service between wireless mobile terminals 10 and 20 according to the present invention. It may include additional information. The relationship between the general SIP message and the extended SIP according to the present invention will be described in more detail.

In general, SIP messages are divided into SIP request messages and response messages, and request messages include INVITE, ACK, BYE, CANCEL, REGISTER, It consists of 6 methods of OPTION, and the response message is 1xx (Informational), 2xx (Success), 3xx (Redirection), 4xx (Clint Error), 5xx (Sever Error), 6xx (Global Error) It is expressed in form.

The SIP message consists of a start line, a message header and a message body. The message body is described as a Session Description Protocol (SDP), and information for session establishment is described, and its configuration includes a session information description section, a time description section, and a media description section. The media description of the message body part may include information as shown in Table 1 below.

field Field description Remarks m Media Name and TCP Port Number necessary i Media title option c Connection Information necessary b Bandwidth information option k Encryption Key option a Media characteristics option

In the extended SIP according to the present invention, the information for establishing a TCP / IP session between terminals is preferably included in the media description unit described in Table 1 above. Accordingly, the extended SIP according to the present invention has a structure in which information for establishing a TCP / IP session of the wireless mobile terminals 10 and 20 is added to the media description unit of the message body without changing the existing SIP. A detailed example in which information for establishing a TCP / IP session between the wireless mobile terminals 10 and 20 is described in the media description unit will be described in detail in an embodiment according to the present invention described below.

According to the present invention, a method for establishing a TCP / IP session using an extended SIP includes: 1) setting up a TCP / IP session between a wireless mobile terminal and a wireless terminal, and 2) a fixed terminal connected to the wireless mobile terminal and the Internet network. (E.g., a personal computer or a server providing a specific application service) when establishing a TCP / IP session, 3) the wireless mobile terminal dials out through a network server to establish a TCP / IP session with another wireless mobile terminal. 4) In case of establishing a TCP / IP session between wireless mobile terminals by performing SIP handshaking in a 1-way manner using extended SIP, 5) 2-way between wireless mobile terminals. There may be a case where a TCP / IP session is set to 1-way handshaking instead of 3-way handshaking by performing SIP handshaking using a 2-way method.

Hereinafter, a method of establishing a TCP / IP session based on an extended SIP in a wireless mobile communication system according to the present invention will be described sequentially in order to distinguish from an existing SIP.

Referring to FIG. 1, in order to communicate, the originating wireless terminal 10 first establishes a PPP connection with a PDSN and receives an IP address from the PDSN.

The caller inputs the telephone number of the called party's wireless mobile terminal 20 instead of the SIP ID to specify the called party's wireless mobile terminal 20. Accordingly, the calling party's wireless mobile terminal 20 receives the called party's wireless mobile terminal ( An INVITE message including a telephone number of 20) is generated and transmitted to the SIP server 100 (step S101).

The invite message may be configured as shown in Table 2 below.

division field Contents Start line INVITE sip: 82162202100@ktf.co.kr; user = phone SIP / 2.0 Message header Via SIP / 2.0 UDP 100.101.102.103:5060 To sip: 82162202100@ktf.co.kr; user = phone From sip: 82114104500@sktelecom.com; user = phone Call-id 10@100.101.102.103 Cseq 1 INVITE Subject This is TCP connection. Content-Type application / sdp Content-length ... Message body Session Information Technology Department v 0 o 82114104500 2890844526 2890844526 IN IP4 100.101.102.103 s TCP connection c IN IP4 100.101.102.103 Time engineering department t 0 0 Media Technology Department m application 49170 TCP chatting

Referring to Table 2, the 'INVITE' field of the start line indicates that the message is an invite request message, and includes' sip 82162202100@ktf.co.kr; user = phone SIP / 2.0 'is the telephone number of the called party's wireless mobile terminal 20 to which the caller wants to set up the call,' 016-220-2100 ', and the called party's wireless mobile terminal 20 using SIP / 2.0. Indicates that you are trying to call.

Here, 'sip: 82162202100@ktf.co.kr; user = phone 'is a SIP ID that matches the telephone number of the called party's wireless mobile terminal 20, and means that the calling party's wireless mobile terminal 10 performs the ENUM function in the invite message. Therefore, in this case, as described above, the ENUM function of the location registration server 200 may be omitted, and the calling party's wireless terminal 10 is assigned by the calling user to the telephone number of the called party's wireless terminal 20. For example, if 016-220-2100 is inputted, the telephone number is converted into a SIP ID (for example, 'sip 82162202100@ktf.co.kr') to generate a part-time message.

When the location registration server 200 provides a function of mapping the phone number of the called party wireless mobile terminal 20 to the SIP ID, the calling party wireless mobile terminal 10 does not perform a separate SIP ID conversion function. A part number message including a phone number of the called party wireless mobile terminal 20, for example, '82162202100' may be generated.

In this case, the SIP server 100 receiving the invite message including the telephone number of the called party wireless mobile terminal 20 transmits the SIP ID for the called party's telephone number included in the invite message to the location registration server 200. ), Modify the called party's telephone number in the 'INVITE' field of the invite message to the provided SIP ID.

Next, when describing the message header, there may be one or more 'Via' fields. If there is one 'via' field in the message as shown in Table 2, the 'via' field indicates its IP address and port number. If two or more 'via' fields exist, the 'via' field (s) described above indicates the IP address and port number of the waypoint, and the last 'via' field indicates its own IP address and port. Indicate the number. In Table 2, since there is one 'via' field, it indicates the IP address and port number of the requester (that is, the originating wireless mobile terminal 10) who requested the invite request message. That is, 'SIP / 2.0 UDP 100.101.102.103:5060' means that the originating wireless terminal 10 transmits the invite message through the '5060' port with the '100.101.102.103' IP address.

A 'To' field indicates a responder of the invite request (ie, called wireless mobile terminal 20), and the 'sip: 82162202100@ktf.co.kr; user = phone 'has the same meaning as described above in the beginning line.

'From' field indicates the requestor of the invite message, and thus the 'sip: 82114104500@sktelecom.com; user = phone 'indicates that the telephone number of the originating wireless terminal 10 is' 011-410-4500'.

'10 @ 100.101.102.103 'in the' Call-ID 'field is the only ID generated by the calling wireless mobile terminal 10 to distinguish a telephone call, and' 1 INVITE 'in the' Cseq 'field is the same call ID. (Call-ID) (i.e., '10 @ 100.101.102.103 ') indicates a call sequence (Call Sequence), and is incremented by one when there is a new request message for the same call ID.

The 'Subject' field is a request header indicating the nature of the call. Thus, 'This is TCP connection' indicates that the call requested by the calling party's mobile terminal 10 to the called party's wireless mobile terminal 20 is TCP / IP. Indicates session setup call.

'Application / sdp' in the 'Content-Type' field indicates the media type of the invite message body, and 'Content-Length' indicates the length of the invite message body.

When describing the message body, the 'v' field of the session information description unit indicates a protocol version. In addition, the 'o' field indicates a message creator / session identifier. The message creator has a telephone number of "011-410-4500", an IP address of "100.101.102.103", and a session of "28908445226." The 's' field indicates the session name. The 'c' field indicates connection information, and '100.101.102.103' indicates the requestor who requested the message (i.e., the originating wireless mobile terminal 10). IP address], and the 't' field of the time description unit indicates a time when the session is activated, and the 'm' field of the media description unit indicates a Media Name and a TCP port number (Transport Address), respectively. .

In particular, in the extended SIP message according to the present invention, a session to be established between the wireless mobile terminals 10 and 20 is set as a peer-to-peer TCP / IP session by adding 'application 49170 TCP chatting' to the 'm' field of the message body. Indicates that In the above description, '49170' represents a TCP port number of an application running in the calling party's wireless mobile terminal 10, and 'chatting' refers to a call requested by the calling party's wireless mobile terminal 10 to the called party's wireless mobile terminal 20. Represents a media name.

As described above, the wireless mobile terminals 10 and 20 incorporate SIP protocol functions and TCP / IP client / server functions, and the application programs implemented in the wireless mobile terminals 10 and 20 are described above. The protocol may communicate with an application program of a server or another wireless mobile terminal through a network.

After the user runs the application program on the calling party's wireless mobile terminal 10, the user may input the telephone number of the called party's wireless mobile terminal 20 in the same manner as in the conventional wireless mobile terminal. The calling party's wireless mobile terminal 10 according to the present invention recognizes the telephone number of the called party's wireless mobile terminal 20, which is normally input, as an attempt to establish an existing voice radio call, and processes the same as the existing voice call setting method. When the telephone number of the called party's wireless mobile terminal 20 is input through the interface provided to the user after the application is driven, it is determined that the call setup is attempted using the extended SIP according to the present invention.

Accordingly, when the calling party's wireless mobile terminal 10 receives the telephone number of the called party's wireless mobile terminal 20 through an interface provided to the user after the application program is driven, the SIP message (in byte) is configured as shown in Table 2 above. Message) is generated and transmitted through the established path with the SIP server 100.

The SIP server 100 receiving the invite message extracts a phone number (016-220-2100 in the example of Table 2) from the invite message to the location registration server 200. Request location information of the called-party wireless mobile terminal 20. The location registration server 200 obtains location information of a terminal having a phone number of 016-220-2100 with reference to a database managed by the location registration server 200 and transmits the location information to the SIP server 100 (step S102).

The SIP server 100 finds the location of the destination wireless mobile terminal 20 from the location registration server 200 and forwards the invite message to the destination wireless mobile terminal 20 (step S104). . In this case, the SIP / PDSN server 100 may generate a “100 Trying” message, which is a kind of 1xx (Informational), in response to the invite message, and send it to the calling party's wireless mobile terminal 10 (step S103). . In addition, the "100 Trying" message may be transmitted to the calling mobile wireless terminal together with the "180 Ringing" message, and these messages (100 Trying, 180 Ringing) may be set as an option.

Upon receiving the INVITE message, the called-party wireless mobile terminal 20 decodes the 'c' field of the session information description unit and the 'm' field of the media description unit of the invite message, and the IP address is' 100.101.102.103. 'It is confirmed that the request from the originating side wireless mobile terminal 10 to establish a peer-to-peer type TCP / IP session, and determines whether to accept the call. At this time, the called party's wireless mobile terminal 20 receives an INVITE message generated by the calling party's wireless mobile terminal 10 in the form of a data burst message. When the called party's wireless mobile terminal 20 accepts a call requested by the calling wireless mobile terminal 10, it establishes a PPP connection with the PDSN, receives an IP address from the PDSN, and then responds to the invite message. The message “200 OK”, which is a type of 2xx (Success), is generated and transmitted to the SIP server 100 (step S105). The SIP server 100 forwards the "200 OK" message to the calling-party wireless mobile terminal 10 (step S106). Here, the "200 OK" message includes the IP address of the called party's wireless mobile terminal 20 that generated the message.

The calling-party wireless mobile terminal 10 generates an "ACK" message in response to the "200 OK" message of the called-party wireless mobile terminal 20 and transmits it to the SIP server 100 (step) S107), the SIP server 100 receives the forwarding information to the called-party wireless mobile terminal 20 (step S108).

Upon receipt of the SIP " ACK " message, the called party's wireless mobile terminal 20 determines in the 'c' field of the session information description portion of the invite message (i.e. IN IP4 100.101.102.103 in the example of Table 2). By using the extracted IP address of the calling mobile terminal 10 (that is, 100.101.102.103 in the example of Table 2), a "SYN" packet for TCP / IP connection is sent to the calling wireless terminal 10. The transmission proceeds with the TCP / IP connection procedure (step S109).

Subsequently, the calling wireless mobile terminal 10 transmits a "SYN ACK" packet to the called wireless mobile terminal 20 in response to the "thin (SYN)" packet (step S110) and the incoming call again. The wireless terminal 20 transmits an "ACK" packet to the calling wireless terminal 10 in response to the "SYN ACK" packet (step S111). A TCP / IP session between (10, 20) is established. In this case, the TCP / IP connection process is a three-way handshaking scheme for a typical TCP / IP connection consisting of transmission of "SYN", "SYN ACK", and "ACK" packets. Used.

As described above, according to the first embodiment of the present invention, the called party wireless mobile terminal 20 transmits the calling party wireless mobile terminal 10 based on the information included in the 'm' field of the media description information of the invite message. Recognizing that a peer-to-peer type TCP / IP session setup has been requested from the caller, and using the IP address of the calling party's wireless mobile terminal 10 described in the 'c' field of the session information technology section of the invite message, the calling party's wireless mobile The TCP / IP session connection process is performed with the terminal 10, and the TCP / IP session established through this process provides the user with a basis for a peer-to-peer chat service.

Meanwhile, the present invention is not limited to establishing a TCP / IP session between wireless mobile terminals by using an extended SIP, and is similar to the TCP / IP setting procedure between the wireless mobile terminals described above with a fixed terminal connected to the Internet. You can set up a TCP / IP session.

Hereinafter, a method of establishing a TCP / IP session to provide a peer-to-peer service between a wireless mobile terminal and a fixed host connected to an internet network will be described.

3 is a diagram illustrating a network structure for establishing a TCP / IP session using an extended SIP for a peer-to-peer service between a wireless mobile terminal and a fixed terminal of an internet network according to the present invention. Shows a process of requesting a call for a TCP / IP session establishment from a fixed terminal 30 in the Internet network.

The calling party wireless mobile terminal 10 establishes a PPP connection with the PDSN for communication with the fixed terminal 30, receives an IP address from the PDSN, and generates an invite message using the fixed terminal 30 as the called terminal. The server 100 transmits to the SIP server 100 (step S301). Here, the invite message describes the IP address of the originating wireless terminal in the 'c' field of the session information description part of the message body, and the 'application 49170 TCP' of Table 2 in the 'm' field of the media description part. Like chatting, the TCP port number of the application and the media name of the request call are described.

The SIP server 100 forwards the invite message to the fixed terminal 30 (step S302), and sends a "100 Trying" message to the originating wireless mobile terminal 10 in response to the invite message. (Step S303). The "100 Trying" message may be set as an option.

Here, the invite message generated by the originating wireless terminal 10 has the same structure as the invite message described in Table 2 above. However, the identification number of the fixed terminal 30 connected to the Internet network may follow a SIP Uniform Resource Locator (URL) or an E.164 type numbering system supported by SIP.

In the embodiment described in the drawing, only the case of following the E.164 type numbering system as in the case of TCP / IP session establishment between the wireless mobile terminals 10 and 20 described with reference to FIG. In the case where the called party's fixed terminal 30 is called according to the E.164 type numbering system, the location information of the called wireless mobile terminal 20 is acquired in the process of establishing a TCP / IP session between the wireless mobile terminals 10 and 20. The step of doing so may be omitted.

The called party fixed terminal 30 receiving the INVITE message receives the message from the calling party's wireless mobile terminal 10 having the IP address described in the 'c' field of the session information description part of the invite message. As described in the field m ', it confirms that the request is for establishing a peer-to-peer TCP / IP session and determines whether to accept the call. When the called party's fixed terminal 30 accepts the call setup request from the calling party's wireless mobile terminal 10, it generates a "200 OK" message as a response message and transmits it to the SIP server 100 (step S304). The SIP server 100 forwards the &quot; 200 OK &quot; message to the calling wireless mobile terminal 10 (step S305). Here, the '200 OK' message includes the IP of the called stationary terminal 30.

The originating wireless terminal 10 generates a "ACK" message in response to the "200 OK" message and transmits it to the SIP server 100 (step S306), and the SIP server 100 receives the call. It forwards to the side fixed terminal 30 (step S307).

The called party fixed terminal 30 uses the IP address of the called party wireless mobile terminal 10 included in the invite message generated by the calling party wireless mobile terminal 10 and transmitted through the SIP / PDSN server 100. Then, the TCP / IP connection process is performed by transmitting a "SYN" packet for the TCP / IP connection to the calling party's wireless mobile terminal 10 (step S308). In the TCP / IP connection process, a three-way handshaking method is used as described with reference to FIG. 1.

4 is a diagram illustrating a network structure for establishing a TCP / IP session using an extended SIP for a peer-to-peer service between a fixed terminal and a wireless mobile terminal in the Internet network according to the present invention. A process of requesting a call for establishing a TCP / IP session from a called-party wireless mobile terminal 10 in a communication network is shown.

The calling station fixed terminal 30 generates the invite message using the wireless mobile terminal 10 as the called terminal and transmits it to the SIP server 100 (step S401). The SIP server 100 sends a "100 Trying" message to the calling party fixed terminal 30 in response to the invite message (step S402), and the called party wireless mobile terminal 10 to the location registration server 200. The location information of the called wireless mobile terminal 10 is determined by requesting the location information of the called party (step S403), and then an INVITE message is sent to the called wireless mobile terminal 10 in the form of a data burst message. Is forwarded (step S404). The "100 Trying" message may be set as an option.

The invite message generated by the calling party fixed terminal 30 has the same structure as the invite message described in Table 2 above, and the calling party fixed terminal 30 is displayed in the 'c' field of the session information description unit of the message body. IP address is described, and the TCP port number of the application and the media name of the request call are described in the 'm' field of the media description unit, for example, 'application 49170 TCP chatting' in Table 2. In addition, the identification number of the fixed terminal 30 connected to the Internet network may be based on a SIP URL or E.164 type numbering system supported by SIP. In the embodiment described with reference to FIG. The following description will be made only in the case of following the E.164 numbering system in the same manner as the TCP / IP session establishment between the wireless mobile terminals 10 and 20 described above.

The recipient wireless terminal 10 receiving the INVITE message receives a message from the media description unit from the calling station fixed terminal 30 having the IP address described in the field 'c' of the session information description portion of the invite message. As described in the field m ', it confirms that the request is for establishing a peer-to-peer TCP / IP session and determines whether to accept the call. When the called party's wireless mobile terminal 10 accepts a call setup request from the calling station's fixed terminal 30, it establishes a PPP connection with the PDSN, receives an IP address from the PDSN, and responds to an invite message. When a "200 OK" message is generated and transmitted to the SIP server 100 (step S405), the SIP server 100 forwards the "200 OK" message to the calling party's fixed terminal 30 (step S406). In this case, the '200 OK' message includes the IP address of the called wireless terminal.

The calling station fixed terminal 30 generates an "ACK" message in response to the "200 OK" message and transmits it to the SIP server 100 (step S407), and the SIP server 100 receives the called party. Forward to the wireless mobile terminal 10 (step S408).

The called party wireless mobile terminal 10 uses the IP address of the fixed terminal 30 included in the invite message generated by the calling station fixed terminal 30 and transmitted through the SIP server 100 to fix the calling party. By sending a "SYN" packet for the TCP / IP connection to the terminal 30, the TCP / IP connection process is performed (step S409). In the TCP / IP connection process, a three-way handshaking method is used as described with reference to FIG. 1.

FIG. 5 is a diagram illustrating a network structure for establishing a TCP / IP session through an out dialing function between wireless mobile terminals using an extended SIP according to the present invention. Referring to the figure, the network for establishing a TCP / IP session through the out-dialing function between the wireless mobile terminals 10 and 20 has a structure in which the network server 300 is further included in the network structure described with reference to FIG. .

The network server 300 is a calling party wireless mobile terminal 20 to which the calling party's wireless mobile terminal 10 connected (log-on) is not connected (log-off). And a server for checking the connection to the called party's wireless mobile terminal 20 through an out-dialing function when communication for establishing a TCP / IP session is desired. The network server 300 is preferably a server that connects to the wireless mobile terminals 10 and 20 to provide an online game or chat service, but is not limited thereto.

In this case, the out-dialing function refers to a call setup process with the called-party wireless mobile terminal 20 by using an extension SIP instead of the calling-party wireless mobile terminal 10 in response to a call setup request from the calling-party wireless mobile terminal 10. Means to do. The other SIP server / PDSN 100, the location registration server 200, and the plurality of wireless mobile terminals 10, 20 perform functions similar to those described in FIG.

When describing a process for establishing a TCP / IP session through the out-dialing function, first, the originating wireless mobile terminal 10 establishes a TCP / IP session with the network server 300, and establishes a set TCP / IP session. When the connection request message for the called party wireless mobile terminal 20 is transmitted to the SIP server 100 (step S501), the SIP server 100 forwards it to the network server 300 (step S502). Preferably, the access request message includes the telephone number of the called party's wireless mobile terminal 20. Accordingly, the network server 300 generates an INVITE message that attempts a connection request to the called-party wireless mobile terminal 20 and transmits it to the SIP server 100 (step S503). Here, the invite message has a structure similar to that of the invite message described in Table 2, wherein the IP address of the network server 300 is described in the 'c' field of the session information description part of the message body, and the ' m 'field describes the TCP port number of the application and the media name of the request call, for example' application 49170 TCP chatting 'in Table 2.

The SIP server 100 receiving the invite message sends a "100 Trying" message to the network server 300 (step S504), and the location registration server 200 to determine the location of the called-party wireless mobile terminal 20. ) And determine the location of the called-side wireless mobile terminal 20 (step S505) and forward the INVITE message to the called-side wireless mobile terminal 20 in the form of a data burst message. (Step S506). The "100 Trying" message may be set as an option.

The called party wireless mobile terminal 20 decodes the 'c' field of the session information description unit and the 'm' field of the media description unit of the invite message, and has a network server 300 having the IP address described in the 'c' field. In the case of confirming that there is a request for establishing a peer-to-peer type TCP / IP session and accepting the connection with the network server 300, the called-party wireless mobile terminal 20 establishes a PPP connection with the PDSN. An IP address is allocated from the PDSN and a "200 OK" message is generated in response to the invite message and transmitted to the SIP server 100 (step S507), and the SIP server 100 forwards it to the network server 300. (Step S508). Here, the "200 OK" message includes the IP address of the called party's wireless mobile terminal 20.

The network server 300 generates a "ACK" message in response to the "200 OK" message and transmits it to the SIP server 100 (step S509), and the SIP server 100 transmits the message to the called party wirelessly. Forward to mobile terminal 20 (step S510).

The called-party wireless mobile terminal 20 that receives the "ACK" message uses a network server (IP) using the IP address of the network server 300 included in the invite message sent by the network server 300. 300, a "thin" packet for a TCP / IP connection is transmitted to proceed with the TCP / IP connection (step S511).

Here, the invite message transmitted by the network server 300 to the called-party wireless mobile terminal 20 is similar to the invite message structure described in Table 2 above. The TCP port number of the network server 300 is preferably added to the 'm' field of the invite message. In the TCP / IP connection process, a three-way handshaking method is used as described with reference to FIG. 1.

Therefore, when the TCP / IP session is established between the called party wireless mobile terminal 20 and the network server 300 through the above-described process, the calling party wireless terminal 10 transmits the called party wireless through the network server 300. Based on the TCP / IP session with the mobile terminal 20, it is possible to receive services of online chat and online games. In other words, even if the called-party wireless mobile terminal 20 is not connected to the network server 300, the calling-side wireless mobile terminal 10 can communicate through the out dialing function of the network server 300. .

Meanwhile, the called party's wireless mobile terminal 20 may establish a TCP / IP session with the calling party's wireless mobile terminal 10 in a direct peer-to-peer manner. This is described below.

FIG. 6 is a diagram illustrating a network structure for establishing a TCP / IP session through an out-dialing function using an extended SIP for a peer-to-peer service between wireless mobile terminals according to the present invention.

Referring to the figure, steps S601 to S610 in which the called-party wireless mobile terminal 20 establishes a TCP / IP session with the originating-side wireless mobile terminal 10 in a direct peer-to-peer manner are described in steps S501 to S610 described with reference to FIG. Same as S510.

Through the above process, a TCP / IP session is established between the calling party wireless mobile terminal 10 and the network server 300 and between the network server 300 and the called party wireless mobile terminal 20. Therefore, the calling party wireless mobile terminal 10 may communicate with the called party wireless mobile terminal 20 based on the TCP / IP session via the network server 300.

In this case, when the user of the calling party wireless mobile terminal 10 wants to communicate with the user of the called party wireless mobile terminal 20 in a peer-to-peer manner, a network server (eg, an application running on the wireless mobile terminal 10) may be used. Request a peer-to-peer communication. This is similar to the process of converting to a one-to-one chat method according to a user's needs while receiving a chat service through a chat server on a wired Internet.

The network server 300 transmits an IP address and a port number of the called party wireless mobile terminal 20 obtained in the process of establishing a TCP / IP session with the called party wireless mobile terminal 10 to the calling wireless terminal 10. Transmit to the wireless mobile terminal (10). The IP address and port number of the called party's wireless mobile terminal 20 transmitted through the TCP / IP session established between the network server 300 and the calling party's wireless mobile terminal 10 are driven by the calling party's wireless mobile terminal 10. It is desirable for the application to be handled.

The originating wireless mobile terminal 10 transmits a "SYN" packet of TCP / IP to the IP address and pod number of the terminating wireless mobile terminal 20 to establish a TCP / IP session with the terminating wireless mobile terminal 20. Proceed with the connection procedure. The TCP / IP session connection procedure uses the three-way handshaking method described above.

When a TCP / IP session is established between the calling / called party wireless mobile terminals 10 and 20 according to the above procedure, the called party wireless mobile terminal 20 preferably releases the TCP / IP session connected to the network server 300. Do.

Therefore, the calling party's wireless mobile terminal 10 directly connects to the called party's wireless mobile terminal 20 which is not connected to the network server 300 by using the out dialing function provided by the network server 300. When a TCP / IP session is established between the wireless mobile terminals 10 and 20, the user can enjoy a chat or a game based on a peer-to-peer TCP / IP session.

In the method for establishing a TCP / IP session through the extended SIP described above, the SIP message is processed in a 3-way handshaking method, and in addition, the TCP is configured in a 3-way handshaking method. Try a / IP connection to establish a TCP / IP session. Here, "3-way handshaking" of SIP message means 'INVITE' message, '200 OK' message, 'ACK' message in order to transmit TCP / IP session setup information. This means that the message is sent. In addition, "3-way handshaking" for TCP / IP connection between terminals means that the packet transmission in the order of 'SYN' packet, 'SYN ACK' packet, and 'ACK packet'. It means to be done. However, given that radio resources are limited, the three-way handshaking process of SIP messages or three-way handshaking for TCP / IP connection may cause overload.

Accordingly, as another embodiment of the present invention, a method of establishing a TCP / IP session by performing a one-way handshaking of a SIP message using an extended SIP and performing a three-way handshaking in a TCP / IP connection process; In this paper, we propose a method of establishing a TCP / IP session by handshaking a SIP message in a two-way manner and in a TCP / IP connection in a one-way manner. Here, the 1-way method of the SIP message and the 2-way method of the SIP message send TCP / IP session setup information to the SIP message together and do not use the 3-way handshaking method for the SIP message. This is how TCP / IP sessions are established.

7 is a one-way handshaking for SIP messages using extended SIP for peer-to-peer service between wireless mobile terminals and three-way handshaking in a TCP / IP connection process according to the present invention. This is a network structure diagram for establishing a TCP / IP session.

Referring to the figure, first, the calling-side wireless mobile terminal 10 establishes a PPP connection with the PDSN for communication, receives an IP address from the PDSN, and then receives the destination wireless mobile terminal 20 as an destination. ) Generates a message and transmits the invite message to the SIP server 100 (step S701).

The SIP server 100 sends a "100 Trying" message to the calling party's wireless mobile terminal 10 in response to the invite message (step S703), and transmits the location of the called party's wireless mobile terminal 20 to the location registration server. 200, and then, the INVITE message is forwarded to the destination wireless mobile terminal 20 in the form of a data burst message (step S704). The "100 Trying" message may be set as an option.

Here, the invite message has the same structure as in Table 2, but further includes information for the called party's wireless mobile terminal 20 to establish a TCP / IP session with the calling party's wireless mobile terminal 10 directly. desirable. According to the present embodiment, the TCP / IP session establishment information added to the invite message shown in Table 2 may be configured as shown in Table 3 below.

division field Contents Message body Media Technology Department m application 49170 TCP chatting a tcpinfo: initialize-sequence 123 a tcpinfo: urgent-point 0 a tcpinfo: window-size 16

The information in the field 'm' is transmitted to the destination wireless mobile terminal 20 by the TCP port number of the application running in the source wireless mobile terminal 10 and the source wireless mobile terminal 10 as described in Table 2 above. Indicates the media name of the requested call.

The field 'a' is a field describing zero or one or more media characteristics. In Table 3, information for establishing a TCP / IP session is set as three media attributes, that is, an initialization sequence. -sequence, urgent-point and window-size are described.

The additional information shown in Table 3 exemplifies additional information for establishing a direct TCP / IP session between the wireless mobile terminals 10 and 20, and is not limited to the above example, but is various for establishing a TCP / IP session. It will be apparent to those skilled in the art that the present invention can be provided.

At this time, the called party wireless mobile terminal 20 decodes the 'c' field of the session information description unit and the 'm' field of the media description unit of the invite message and has an IP address described in the 'c' field. When the mobile terminal 10 confirms that there is a request for establishing a peer-to-peer type TCP / IP session and accepts the connection with the calling-party wireless mobile terminal 10, the called-party wireless mobile terminal 20 After establishing a PPP configuration with the PDSN and receiving an IP address from the PDSN, a TCP / IP session connection process is performed by transmitting a "SYN" packet for a TCP / IP connection to the calling wireless mobile terminal 10. Proceed to step S707. In the TCP / IP connection process (step S708), a three-way handshaking method is used as described with reference to FIG.

Therefore, when the called party's wireless mobile terminal 20 accepts a call for the invite message generated by the calling party's wireless mobile terminal 10, it transmits one SIP message (1-byte handshaking). TCP / IP connection process is carried out by this method, and thus, the TCP between the wireless mobile terminals 10 and 20 is changed by changing only the transmission of the SIP message to the 1-way method without changing the existing TCP / IP connection method using the extended SIP. The / IP session can be configured to reduce the load on the network by reducing the number of SIP messages sent.

If the called party's wireless mobile terminal 20 fails to accept the call, it generates a "Reject" message and transmits it to the SIP server 100 (step S705), and the SIP server 100 sends it to the calling party. Forward to wireless mobile terminal 10 (step 706).

As described above, the application of the wireless mobile terminal 10 or 20 operating based on the established TCP / IP session may be a program for transmitting and processing not only voice but also multimedia data such as a game and a chat.

8 is a diagram illustrating a network structure for establishing a TCP / IP session in a 2-way manner using an extended SIP for a peer-to-peer service between wireless mobile terminals according to the present invention. Referring to the figure, the calling party mobile terminal 10 establishes a connection with the PDSN for communication and receives an IP address from the PDSN, and generates an invite message destined for the called party wireless mobile terminal 20. The invite message is transmitted to the SIP server 100 (step S801).

The SIP server 100 checks the location of the called party's wireless mobile terminal 20 through the location registration server 200 (step S802), and generates a "100 Trying" message in response to the invite message and sends it to the calling party. It transmits to the wireless mobile terminal 10 (step S803). The SIP server 100 forwards the INVITE message to the destination wireless mobile terminal 20 in the form of a data burst message by using the location information of the destination wireless mobile terminal 20 (step). S804). The "100 Trying" message may be set as an option. Here, the invite message may be configured as described with reference to FIG. 7.

At this time, the called-party wireless terminal 20 decodes the 'c' field of the session information description section, the 'm' field and the 'a' field of the media description section of the invite message, and uses the IP address described in the 'c' field. When the mobile station 20 confirms that there is a request for setting up a peer-to-peer type TCP / IP session from the calling source mobile terminal 10 and receives the call, the called party wireless mobile terminal 20 establishes a PPP configuration with the PDSN from the PDSN. After receiving an IP address, an extended SIP message (that is, a "200 OK" message) carrying TCP / IP information is generated and transmitted to the SIP server 100 (step S805). The SIP server 100 forwards it to the originating wireless mobile terminal 10 (step S806). If the called party's wireless mobile terminal 20 does not accept the call, it generates a "Reject" message and transmits it to the SIP server 100, and the SIP / PDSN server 100 transmits it to the calling party's wireless mobile station. Forward to the terminal.

The "200 OK" message may be configured as shown in Table 4 below.

division field Contents Start line SIP / 2.0 200 OK Message header Via SIP / 2.0 / UDP proxy.sktelecom.com:5060 Via SIP / 2.0 / UDP 100.101.102.103 To sip: 82162202100@ktf.co.kr; user = phone From sip: 82114104500@sktelecom.com; user = phone Call-id 10@100.101.102.103 Cseq 1 INVITE Subject This is TCP connection. Contact sip: 82162202100@ktf.co.kr Content-Type application / sdp Content-length ... Message body v 0 o 82162202100 2890844526 2890844526 IN IP4 200.201.202.203 s TCP connection c IN IP4 200.201.202.203 t 0 0 m application 32170 TCP chatting a tcpinfor: initialize-sequence 164 a tcpinfor: urgent-point 0 a tcpinfor: window-size 16

The called party's wireless mobile terminal 20 receives information for establishing a TCP / IP session in an invite message generated by the calling party's wireless mobile terminal 10 received through the SIP server 100 (that is, refer to FIG. 7). Information], and the calling party's wireless mobile terminal 20 uses the information for establishing a TCP / IP session in the &quot; 200 OK &quot; message generated by the called party's wireless mobile terminal 20 (that is, the message in Table 4 above). The IP address of the called party's wireless mobile terminal 20 described in the 'c' field of the body, the TCP port number '32170' in the 'm' field, the initialization sequence number '123' in the 'a' field and the agent point. '0' and window size '16'] are used to set up a TCP / IP session.

Since the wireless mobile terminals 10 and 20 have all the information for establishing the TCP / IP session, one signal for requesting the TCP / IP session establishment of the calling terminal 10, for example, the "acknowledgement of TCP / IP" (ACK) &quot; packet is transmitted to the destination wireless mobile terminal 20 to establish a TCP / IP session between the wireless mobile terminals 10 and 20 (step S807).

As a result, TCP / IP session establishment information between the wireless mobile terminals 10 and 20 is sent together in the extended SIP message (ie, the invite message and the ok message) to perform 3-way handshaking for the TCP / IP connection. It is possible to establish a TCP / IP session only with -way handshaking. Therefore, in case of using the 2-way method of the extended SIP message according to the present invention, the extended SIP message is transmitted in the 2-way method, and the TCP / IP connection process is performed in the 1-way method, which is a link compared to the conventional method. The delay is reduced, reducing the TCP / IP connection setup time.

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described in detail above, according to the present invention, by establishing a TCP / IP session based on the extended SIP to provide a base for peer-to-peer application service service between terminals, a mobile data service such as a CDMA 2000 system, W-CDMA, etc. In a communication system, it is possible to reliably transmit data.

In addition, by connecting to a network server and requesting a connection from the network server and other users who are not online through the out-dialing function of the network server, it is possible to communicate with the desired user.

In addition, TCP / IP sessions can be set up in 2-way or 1-way mode without 3-way handshaking by sending information for establishing TCP / IP sessions in the extended SIP message, thereby reducing overload on the network. This has the effect of setting up a TCP / IP connection.

Claims (13)

A first step in which an originating wireless mobile terminal attempting to originate using an extended Session Initiation Protocol (SIP) is allocated an IP address from an IP address assigning means; The calling wireless terminal is required to set the assigned IP address, the identification number of the called wireless terminal, the TCP port number of the application running in the calling wireless terminal and the TCP / IP session setup. A second step of generating an INVITE message including information indicating and transmitting the generated message to the SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; Receiving the IP address from the IP address allocating means, generating an OK message in response to the invite message, and transmitting the generated OK message to the calling wireless terminal through the SIP server; Step 5; A sixth step of generating, by the originating wireless mobile terminal receiving the ok message, an ACK message and transmitting it to the called wireless mobile terminal through the SIP server; The called-party wireless mobile terminal uses the IP address and TCP port number of the calling-party wireless mobile terminal included in the invite message, and information indicating that a TPC / IP session is required. And a seventh step of proceeding with a connection process for establishing a peer-to-peer TPC / IP session. How to set up an IP session. A first step in which an originating wireless mobile terminal attempting to originate using an extended Session Initiation Protocol (SIP) is allocated an IP address from an IP address assigning means; The calling wireless terminal is assigned the IP address, the identification number of the called station fixed terminal connected to the wired communication network, the TCP port number of the application running in the calling wireless terminal and TCP / IP (TCP / IP). A second step of generating an INVITE message including information indicating that session establishment is required and transmitting it to a SIP server; Transmitting, by the SIP server, the invite message to the called party fixed terminal using the identification number of the called party fixed terminal; A fourth step in which the called party's fixed terminal generates an OK message in response to the invite message and transmits it to the calling party's wireless mobile terminal through the SIP server; A fifth step of generating, by the originating wireless mobile terminal receiving the ok message, an ACK message and transmitting it to the called party's fixed terminal through the SIP server; The called party's fixed terminal peers with the calling party's wireless mobile terminal by using the IP address and TCP port number of the calling party's wireless mobile terminal included in the invite message, and information indicating that a TCP / IP session is required. For a peer-to-peer service between a wireless mobile terminal and a fixed terminal connected to a wired communication network, comprising a sixth step of proceeding with a connection process for establishing a two-peer type TPC / IP session. How to set up TPC / IP session using Extended SIP. The fixed terminal connected to the wired network has its IP address, the identification number of the wireless mobile terminal of the called party, the TCP port number of the application running on the calling party's fixed terminal, and TCP / IP session settings. A first step of generating an INVITE message including information indicating that it is required and transmitting it to a SIP server; A second step of the SIP server querying a wireless mobile terminal location register based on an identification number of the called wireless terminal to obtain location information of the called wireless terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using location information of the called-party wireless mobile terminal; A fourth step in which the called-party wireless mobile terminal is assigned an IP address from an IP address allocating means, generates an OK message in response to the invite message, and transmits an OK message to the calling party fixed terminal through the SIP server; Wow; A fifth step of generating, by the originating stationary terminal receiving the ok message, an ACK message and transmitting it to the called party mobile terminal through the SIP server; The called party's wireless terminal peers with the calling station's fixed terminal by using the IP address and TCP port number of the calling station's fixed terminal included in the invite message, and information indicating that a TPC / IP session is required. An extension S for peer-to-peer service between a fixed terminal connected to a wired communication network and a wireless mobile terminal, comprising a sixth step of proceeding to a connection process for establishing a peer-to-peer / IP session. How to set up TPC / IP session using IP. A first step of sending, by the calling-side wireless mobile terminal connected to the network server, the access request information including the identification number of the called-side wireless mobile terminal not connected to the network server through a SIP server; Obtaining, by the network server, location information of the called-party wireless mobile terminal by inquiring to the wireless mobile terminal location registration means based on the identification number of the called-party wireless mobile terminal through the SIP server; The network server generates an invite message including an identification number of the called-party wireless mobile terminal, a TCP port number of an application, and information indicating that a TPC / IP session is required, and converts the invite message into the location information. Transmitting to the incoming wireless mobile terminal through an SIP server by using a third step; A fourth step in which the called party wireless mobile terminal is assigned an IP address by an IP address assignment means, generates an OK message in response to the invite message, and transmits the OK message to the network server through the SIP server; A fifth step of the network server receiving the OK message generating an ACK message and transmitting the generated ACK message to the called-party wireless mobile terminal through the SIP server; The destination wireless mobile terminal establishes a peer-to-peer TPC / IP session with either the network server or the originating terminal by using the TCP port number and information indicating that a TPC / IP session is required. And a sixth step of proceeding with the connection process for establishing a TPC / IP session using the extended SIP for the peer-to-peer service between the wireless mobile terminals. The method of claim 4, wherein The network server is a chat service providing server and a game service providing server, characterized in that for establishing a TPC / IP session using extended SIP for peer-to-peer service between wireless mobile terminals. The method of claim 4, wherein The TCP port number is a TCP port number of an application running on any one of the originating wireless mobile terminal and the network server. How to set up CPI / IP session. A first step in which a calling party's wireless mobile terminal attempting to make a call using the extended SIP is allocated an IP address from an IP address assigning means; The calling wireless terminal includes the assigned IP address, the identification number of the called wireless terminal, the TCP port number of the application running in the calling wireless terminal, and TCP / IP session establishment information. A second step of generating an INVITE message to a SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; A fifth step in which the called-party wireless mobile terminal is assigned an IP address from the IP address assignment means; The called-party wireless mobile terminal uses the IP address, TCP port number, and TPC / IP session establishment information of the calling-party wireless mobile terminal included in the invite message to peer-to-peer with the calling wireless terminal. Establishing a TPC / IP session using the extended SIP for the peer-to-peer service between the wireless mobile terminals, comprising a sixth step of proceeding to a connection process for establishing a TPC / IP session of the TPC / IP session. How to set up. The method of claim 7, wherein The TPC / IP session setup information includes a TCP port number (Transport Address), information indicating that a TPC / IP session setup is required, an Initialize Sequence, an Urgent Point, and a window size. Method for establishing a TPC / IP session using the extended SIP for the peer-to-peer service between the wireless mobile terminal, characterized in that comprises a). A first step in which a calling party's wireless mobile terminal attempting to make a call using the extended SIP is allocated an IP address from an IP address assigning means; The caller's wireless mobile terminal includes the assigned IP address, an identification number of the called party's wireless mobile terminal, a TCP port number of an application running in the caller's wireless mobile terminal, and TCP / IP session setup information. A second step of generating an INVITE message to a SIP server; A third step of the SIP server querying a wireless mobile terminal location register based on the identification number of the called wireless mobile terminal to obtain location information of the called wireless mobile terminal; Transmitting, by the SIP server, the invite message to the called-party wireless mobile terminal using the location information of the called-party wireless mobile terminal; The called party wireless mobile terminal is assigned an IP address from the IP address assignment means, and in response to the invite message, the assigned own IP address, the identification number of the calling party wireless mobile terminal, and the called party wireless mobile terminal. A fifth step of generating an OK message including a TCP port number and a TCP / IP session setup information of an application running in the home server and transmitting the generated OK message to the calling wireless terminal through the SIP server; ; The caller's wireless mobile terminal uses the IP address, TCP port number, and TPC / IP session establishment information of the called party's wireless mobile terminal included in the OK message, to establish a peer-to-peer type connection with the called-party wireless mobile terminal. Establishing a TPC / IP session using an extended SIP for a peer-to-peer service between the wireless mobile terminals, comprising a sixth step of proceeding to a connection process for establishing a TPC / IP session. How to. The method of claim 9, The TCP / IP session setup information included in the invite message and the OK message includes a TCP port number, information indicating that the TCP / IP session setup is required, an initialize sequence, an agent point. Method for establishing a TPC / IP session using the extended SIP for the peer-to-peer service between the wireless mobile terminal, characterized in that it comprises a (Urgent Point) and a window size (Window Size). The method of claim 9, In the sixth step, the peer-to-peer session is established by transferring the information for the TPC / IP connection from the originating wireless mobile terminal to the called-party wireless mobile terminal once. How to set up TPC / IP session using extended SIP for two-peer service. The method according to any one of claims 1 to 11, The wireless mobile terminal establishes a TPC / IP session using an extended SIP for a peer-to-peer type service, wherein the STP / IP protocol function and an embedded STP protocol function are built in the wireless mobile terminal. The method according to any one of claims 1 to 11, The extended SIP uses the extended SIP for the peer-to-peer type service, wherein the information for establishing the TPC / IP session between the wireless mobile terminals is recorded in the media description information field of the SIP message. How to set up an IP session.