KR20050114155A - Apparatus and method for transmitting instant message through short message service in push-to-talk system - Google Patents

Abstract

In the push-to-talk system according to an aspect of the present invention, a method for delivering an instant message through a short message may include receiving an instant message from a push-to-talk service first terminal through a network and at least one agent identified from the received instant message. 2 confirming whether the terminal is in the push-to-talk service enabled state, and if the second terminal is in the push-to-talk service disabled state, a call processing step for requesting the transmission of an SMS short message and an instant message input from the call processing step corresponding thereto; Converting the short message into an SMS and transmitting the short message to the second terminal through a network.

Description

Apparatus and Method for Transmitting Instant Message Through Short Message Service in Push-to-Talk System}

The present invention relates to an apparatus for transmitting an instant message through a short message and a method thereof in a push-to-talk system, and more particularly, when a destination terminal of a PTT instant service is not logged in to a PTT service, that is, a destination terminal is instant. The present invention relates to an apparatus and a method for delivering an instant message through a short message in a push-to-talk system for converting an instant message into a short message when the message cannot be received.

Push to Talk (hereinafter referred to as PTT) is a service that supports one-to-many (group) calls in a packet network, which is a wireless Internet, and the voice network (circuit) and the IP network (packet) in the 'all IP network' era. Signal to announce that the entrance to the. In other words, PTT has emerged in the flow of integrating and evolving all network environments of wired / wireless into Internet protocol.

PTT systems allow a group of individuals with a terminal to communicate with other members of the same group, typically relying on a single frequency, ie a dedicated channel. Because PTT uses a half-duplex communication method because it uses a dedicated channel, half-duplex communication means that data can be transmitted in both directions but not simultaneously in both directions. In other words, when transmitting from one side, only the other side can receive the data. When communicating in a group, only one member can transmit information to other members at a given time, and all other members can receive and listen to data transmitted from one transmitting member on a dedicated broadcast channel. Can be. A member who wants to transmit to another member in the group typically transmits an access request by pressing a PTT button of a terminal that accesses only a user to a dedicated channel.

In a system that provides group or point-to-multipoint communication, TRS first started service before PTT. The TRS (Trunked Radio System) is a trunk line system that allows a large number of users to share a common channel, unlike a cellular system such as a mobile phone that is dedicated to a certain frequency. That is, the system is characterized by maximizing the utilization of the frequency. Therefore, when using 16 channels, existing mobile phones can accommodate about 500 people, but TRS is capable of sharing up to 5,000 people, 10 times larger than this. Therefore, TRS is a communication service that is suitable for business use mainly because of various kinds of service and low price compared to vehicle phones or mobile phones which are widely used.

In other words, TRS can perform functions such as wireless data, two-way wireless calling, as well as mobile phone with one terminal, and has the advantage of using various additional services. In particular, when the TRS is connected to the public telecommunication network (PSTN), it can function as a mobile phone.

As such, TRS is suitable for large transportation companies, taxi companies, large-scale field management, distribution business, and security services. The TRS service is similar to a walkie-talkie called a walkie-talkie in terms of service. However, the TRS is up to 50 km, although the radio range is around 2 km, centering on the base station. It also has the advantage of no interference and excellent security. In addition, TRS is a frequency channel that allows not only one-to-one individual communication but also more than 130 people to talk simultaneously. In other words, group call is the biggest advantage of TRS.

But TRS has the fatal drawback of using frequencies in common. An example is the disadvantage that a separate secret call function is required for special tasks such as leakage of call contents.

PTT, which appeared after TRS, is basically a one-to-many (group) call and voice call that could be used in a radio or TRS, and additional functions such as instant messenger and status display (aka, presence) are also supported. Most of all, it is possible to use voice over Internet Protocol (VoIP) voice service at a relatively low investment cost and rate by utilizing the current wireless Internet network.

The PTT service is based on SIP (Session Initiation Protocol), which is a text-based application level protocol. SIP has a simple structure and excellent scalability compared to the existing protocol. have.

In general, SIP is a standard defined in the Internet Engineering Task Force (IETF) Request for Comments (RFC) 2543 document, and is an application for establishing, modifying, and terminating sessions or calls for multimedia communication such as video and audio. Layer control protocol. SIP is a protocol that exists above the UDP / TCP / IP layer. It is a client / server protocol that can send and receive SIP request and SIP response messages in a request / response manner. It supports both unicast and multicast sessions to get started.

SIP request messages are sent in RFC2543 by INVITE (Invite to attend session), ACK (Acknowledge Request), BYE (End Call), REGISTER (User Agent registers in the redirect server's database), CANCEL (Cancel Pending Request), OPTIONS Six basic functions are provided, and SIP response messages include 1xx (information response), 2xx (successful response), 3xx (redirect response), 4xx (client error, request failure), 5xx (server failure), and 6xx status codes. (Global failure).

If the PTT called subscriber does not log in to the PTT service, the SIP INVITE message is not delivered to the called terminal. At this time, depending on the type of instant message, the incoming call is handled because the incoming call is failed because the incoming personal call is handled and the called terminal is not aware that the call was attempted. The reason that the subscriber is called because the subscriber failed to be received and only the group call between the idle (Idle) subscribers are set up, and the called terminal in the logged out state does not know that the call was attempted.

That is, in the conventional system, when the destination terminal is in a PTT logout state even when the destination terminal is in a callable state, when the destination terminal is in a state capable of receiving instant messages, the PTT server transmits an instant message to the receiving terminal. It may be stored up to, but there was a problem that can not immediately deliver the instant message to the destination terminal.

In order to solve the above problems, the present invention, by converting the contents of the instant message that the PTT originating subscriber wants to transfer to the SMS short message of the CDMA delivered to the destination terminal, the instant message regardless of the log-out state of the PTT service of the called subscriber It is an object of the present invention to provide an apparatus and a method for delivering an instant message through a short message in a push-to-talk system for transmitting the contents of the message to a called terminal.

In the push-to-talk system according to an aspect of the present invention, a method for delivering an instant message through a short message may include receiving an instant message from a push-to-talk service first terminal through a network and at least one agent identified from the received instant message. 2 confirming whether the terminal is in the push-to-talk service enabled state, and if the second terminal is in the push-to-talk service disabled state, a call processing step for requesting the transmission of an SMS short message and an instant message input from the call processing step corresponding thereto; Converting the short message into an SMS and transmitting the short message to the second terminal through a network.

In the push-to-talk system according to another aspect of the present invention, an instant message delivery device via a short message includes a connection establishment protocol message processing unit for interfacing an instant message transmitted through a network from a first terminal, and input from the connection establishment protocol message processing unit. A call processing unit which analyzes the received message, grasps the subscription information and the state of the second terminal, and requests the short message transmission to the called subscriber in the push-to-talk service unavailable state; And an SMS client which receives the short message request information for the push-to-talk service unavailable destination terminal from the call processor and requests a short message transmission to an SMS system of a public mobile communication network.

The instant message delivery system through a short message according to another aspect of the present invention, receives an instant message from the push-to-talk service first terminal, push the subscription information and push of the push-to-talk service second terminal from the received instant message Checking whether the two-talk service is available, if the second terminal is in a push-to-talk service unavailable state, the push-to-talk system for requesting the transmission of the short message using the information of the instant message and the short-message transmission from the push-to-talk system SMS system for receiving the request to determine the location of the second terminal, and to send a short message corresponding to the instant message to the second terminal.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

In the PTT system 100, communication has been limited to members operating at relatively close distances using the same communication technology. In other words, the reality has not been extended from CDMA communication systems to other communication networks and technologies such as data networks and satellite communication systems. Recently, however, a method of interworking with a CDMA (code division multiple access) communication system or a PSTN (public switched telephone network) has been developed, and as shown in FIG. 1, a service has been made possible by interworking with a public mobile communication network. The commercialization of the used PTT service is in progress.

1 shows a configuration of a PTT system to which the present invention is applied.

As shown in FIG. 1, the PTT system 100 is linked with the public mobile communication network 110. The public mobile communication network 110 may be referred to as an access network, and the PTT system 100 may be represented as an IP network. The terminal may be interpreted to mean that the PTT system, which is an IP network, is accessed through a public mobile communication network.

When a subscriber of a PTT service transmits an instant message through a portable terminal, the CDMA system components BTS (Base Transceiver Station), BSC (Base Station Controller) and MSC (Mobile Switching Center) In order to reach the access network through the back, and to reach the PTT system 100 which is an IP network, it must be through the PDSN 111.

A PDSN (Packet Data Serving Node) plays a role of interworking an access network and an IP network. The IP of the PDSN 111 is set differently for each access network, and the PDSN 111 is a proxy server 103. ) And the PTT system 100 to determine the location of the subscriber. PDSN is a core component of Data Core Network (DCN), a system that provides packet data service to mobile subscribers. The PDSN transmits radio signals to IP network through interworking between RAN (Radio Access Network) corresponding to wireless network connection and DCN. It is a device that connects, and its capacity increases in proportion to the size of wireless Internet subscribers and wireless data.

The instant message passing through the PDSN 111 is input to the PTT system 100 including the proxy server 103, the PTT AS 102, the GLMS 101, the presence server 104, and the like.

The PTT AS (Application Server) 102 is a server that controls a PTT session and plays a pivotal role in the case where a talk session is formed. The talk session of the PTT service is based on the talk type, Instant Personal Talk, which is a one-to-one type of communication, Instant Group Talk, which is a communication between preset groups, and a subscriber invites at the time of communication. Ad-hoc group talk (Ad-hoc Group Talk) in which communication between terminals can be divided into a chat talk session in which several subscribers can participate in an established chat room.

GLMS (Group and List Management Server) 101 is a server that stores the information of the PTT service subscriber, the information of the PTT service subscriber (for example, in conjunction with the proxy server 103 and the PTT AS 102) ID, terminal number, which talk group belongs to, etc.).

Presence Server 104 is a server that stores status information such as whether a PTT service subscriber is online and its location, and notifies users who want this information by registering / maintaining their current location. To enable immediate communication services.

The proxy server 103 is a router of an application layer that delivers SIP requests / responses. The proxy server 103 also has a proxy server 103 at the destination side of the PTT service to interwork with the PDSN 111 of the destination public mobile communication network. The number of proxy servers 103 will increase depending on the network with which the interworking network is linked.

2 shows a configuration of a PTT system and an SMS system for instant message processing according to the present invention.

When a subscriber using a PTT service wants to send an instant message, a SIP message is defined as a "MESSAGE Request." The originating proxy server 103 which receives the "MESSAGE request" from the originating terminal transmits the "MESSAGE request" to the PTT AS 102. The PTT AS 102 receives the "MESSAGE Request" message from the originating proxy server 103 and transmits it to the proxy server 103 of the called party's subscriber.

 The destination proxy server transmits a SIP message to the terminal when the terminating terminal is in the PTT service login state, but notifies the PTT AS 102 to the PTT AS 102 without transmitting to the terminal immediately when the terminating terminal is in a service unavailable state. The PTT AS 102, which has received the notification that the called subscriber is in an unserviceable state, delivers the contents of the instant message to the called terminal through the SMS short message.

The PTT AS 102 uses the SMS system 20 of the existing public network mobile communication network for short message transmission. The SMS system 20 is largely an SMS server 21 and an SMS center (SMC: Short Message Center (SMC)). 22). The SMS server 21 receives short message information from various external SMS clients and transmits the short message information to the SMS center 22. Communication between the PTT AS 102 and the SMS system 20 is typically accomplished using the TCP / IP protocol.

Upon receiving the short message information from the SMS server 21, the SMS center 22 requests the location information of the called terminal to a home location register (HLR) of a public mobile communication network, and the called terminal sends a message to an MSC. It checks if the location is registered and transmits information such as the number of the called terminal, the content of the short message, and the number of the calling terminal to the corresponding exchange. The exchange receiving the short message information determines which base station manager (BSC) and the base station (BTS) are in charge of the called terminal and transmits the short message to the called terminal in the cell.

3 is a block diagram of a PTT AS required for instant message processing according to the present invention.

FIG. 3 illustrates the instant message processing flow in more detail with reference to the PTT AS 102, which will be understood from the extension of FIG. 2.

The place where the SIP message is first contacted by the proxy server 103 is the SIP message processing unit 31 in the PTT AS 102. The SIP message processor 31 receives the SIP message and serves to interface the SIP protocol type message to be interpreted by the call processor 32. The call processor 32, which has received the message from the SIP message processor 31, analyzes each field of the message and goes through a process of identifying which message is transmitted from which calling terminal to which called terminal.

The call processing unit 32 grasping the contents of the SIP message transmits the message to the proxy server 103 to which the called terminal belongs. In this case, when there is more than one called terminal, as many messages as the called terminal are transmitted. The destination proxy server 103 transmits an instant message to a corresponding destination terminal when the destination terminal is logged in, and notifies the PTT AS 102 of an incoming failure instead of transmitting an instant message to the destination terminal when the destination terminal is not logged in.

 The call processor 32 requests the SMS client 33 to send the SMS short message to the terminal that has failed to receive the call. The SMS client 33 requests the SMS system 20 to send the SMS short message containing the contents of the instant message to the called party's called number. The process of transmitting the short message in the SMS system 20 will be omitted since it has been described above in the process of FIG. 2.

4 shows a processing flow for the SIP MESSAGE request of the PTT AS according to the present invention.

As described above, a SIP message when a subscriber using a PTT service wants to send an instant message is defined as a “MESSAGE Request”, and when an instant message by a calling subscriber is transmitted through an access network, a PTT AS 102 receives the SIP " MESSAGE Request " message (S41). The PTT AS 102 identifies the called party by looking at the [To] field of the SIP “MESSAGE Request”, where there may be only one called party (if Instant Personal Talk), or a previously designated group (Instant Group Talk). ) Or multiple people (if Ad-hoc Group Talk) that you specify on the fly at the time the user sends the message.

The PTT AS 102 confirming the called party transmits an instant message to the proxy server 103 of the called party, and the proxy server 103 determines whether the called party is a subscriber logged in to the PTT service (S42), and the called subscriber is PTT. If the service is normally logged in, the 'MESSAGE request' message transmitted from the calling subscriber is transmitted to the called subscriber to send and receive normal instant messages (S43). If the incoming call is a user who is not logged in to the PTT service, the proxy server 103 transmits the incoming call failure to the PTT AS 102, and the PTT AS 102 requests a short message transmission to the SMS server 21. (S44).

When the short message transmission request is sent to the SMS server 21, the content of the message includes the content of the SIP 'MESSAGE request', and a request for a short message having the same content as that of the instant message is made to the called terminal. The number of the called terminal transmits a value that the PTT AS 102 receives from the GLMS 101 and stores when the originating subscriber who first sends the instant message logs in.

If the [To] field containing the called subscriber information of the SIP 'MESSAGE request' includes a specific group ID or includes several called subscribers (S45), the called subscriber's PTT by the proxy server 103 is included. The process of checking whether the service is logged in is not terminated at once but goes through the same repeated process several times. By determining whether the remaining called subscriber is logged in to the PTT service or logged out (S42), the receiver is instant Whether to transmit the message (S43) or via the SMS server 21 determines whether to send a short message (S44).

The present invention converts an instant message into a text message when the called subscriber of the PTT service is not logged in to the PTT service, and transmits the received message to the receiving terminal regardless of the PTT service state of the called subscriber. If the instant message is sent to more than one group, the contents of the instant message can be simultaneously transmitted to all group members regardless of the status of the called subscribers.

1 is a block diagram of a PTT system to which the present invention is applied.

2 is a block diagram of a PTT system and an SMS system for instant message processing according to the present invention.

Figure 3 is a block diagram of a PTT AS required for instant message processing according to the present invention.

4 is a process flow diagram for a SIP MESSAGE request of a PTT AS in accordance with the present invention.

* Description of the symbols for the main parts of the drawings *

100: PTT system 110: public mobile communication network

111: PDSN 101: GLMS Server

102: PTT AS 103: Proxy Server

104: presence server 20: SMS system

21: SMS server 22: SMS Center

Claims (12)

In the push-to-talk system to send an instant message, Receives an instant message from a push-to-talk service first terminal through a network, and determines whether at least one second terminal identified from the received instant message is in a push-to-talk service enabled state, so that the second terminal is push-to-talk service A call processing step of requesting the transmission of an SMS short message when it is in an impossible state; Wow And a short message transmitting step of converting an instant message input from the call processing step into an SMS short message corresponding thereto and transmitting the short message to the second terminal through a network. The method of claim 1, The call processing step, Instant message delivery method through a short message in a push-to-talk system, characterized in that whether the at least one second terminal is a push-to-talk service available state through the destination proxy server. The method of claim 1, The short message transmission step, Requesting a short message transmission to an SMS server of a public mobile communication network through an SMS client in a push-to-talk application server; Transmitting, by the SMS server receiving the short message request, the short message request information to an SMS center; And And receiving, by the SMS center receiving the short message request information, a short message to a destination terminal through a public mobile communication network. The method of claim 3, wherein The short message request information, And a terminal number of the second terminal, contents of an instant message intended by the first terminal, and information on the first terminal. The method of claim 1, The short message transmitting step is an instant message delivery method through a short message in a push-to-talk system, characterized in that it is performed repeatedly as much as the number of the destination terminal. In the push-to-talk system to send an instant message, Receives an instant message from a push-to-talk service first terminal through a network, and determines whether at least one second terminal identified from the received instant message is in a push-to-talk service enabled state, so that the second terminal is push-to-talk service A call processing step of requesting the transmission of an SMS short message when it is in an impossible state; And And a short message transmission request step of requesting a short message transmission through an SMS client using information of the instant message input from the call processing step. The method of claim 6, The short message transmission request step is an instant message delivery method through a short message in a push-to-talk system, characterized in that it is repeatedly performed as the number of the remaining destination terminal. An apparatus for transmitting instant messages in a push-to-talk system, A connection establishment protocol message processing unit for interfacing the instant message transmitted from the first terminal through the network; A call processing unit for analyzing a message input from the connection establishment protocol message processing unit, grasping subscription information and status of a second terminal, and requesting a short message transmission to a called subscriber in a push-to-talk service unavailable state; And Instant message via a short message in a push-to-talk system including an SMS client for receiving a short message request information on the push-to-talk service unavailable destination terminal from the call processing unit and requesting a short message transmission to an SMS system of a public mobile communication network Delivery device. The method of claim 8, The short message request information, And a terminal number of a second terminal, contents of an instant message intended by the first terminal, and at least one or more of information on the first terminal. In a system for sending instant messages, Push-to-talk service Receives an instant message from the first terminal, and confirms the subscription information and the push-to-talk service availability of the push-to-talk service second terminal from the received instant message, the second terminal is unable to push-to-talk service A push-to-talk system for requesting the transmission of a short message using the information of the instant message when in a state; and Receives a short message request from the push-to-talk system to determine the location of the second terminal, instant message delivery using a short message including an SMS system for transmitting a short message corresponding to the instant message to the second terminal system. The method of claim 10, And the push-to-talk system and the SMS system communicate using a TCP / IP protocol. The method of claim 10, The push-to-talk system, And the instant message received from the first terminal is immediately transmitted to the second terminal when the state of the second terminal is in a push-to-talk service enabled state.