KR20080057583A - Presence service terminal and method for transmitting and receiving the RTP packet - Google Patents

Abstract

The present invention relates to a presence service terminal and a method for transmitting and receiving an RTP packet. When the presence service terminal attempts to transmit and receive an RTP packet, the present invention establishes an RTP session by negotiating session establishment information with a counterpart terminal and then transmits and receives an RTP packet. To solve the problem, each terminal adds information such as a codec and a transmission / reception port necessary for negotiation of the RTP session to the presence information, and transmits it to the server, and the codec included in the presence information of the buddy transmitted from the server. And by transmitting the RTP packet according to the port, the RTP packet can be directly transmitted and received without negotiation for the establishment of the RTP session between the presence service terminals.

Description

PRESENCE SERVICE TERMINAL AND RTP COMMUNICATION METHOD THEREOF}

1 is a flowchart illustrating a method of transmitting and receiving an RTP packet between a presence service terminal according to the related art.

2 is a diagram illustrating a detailed configuration of a presence service terminal according to the present invention;

3 is a diagram illustrating an embodiment of transmitting and receiving an RTP packet of a presence service terminal according to the present invention;

4 is a flowchart illustrating a method of transmitting and receiving an RTP packet of a presence service terminal according to the present invention;

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

S40: Send presence information including binding port for each codec to server

S41: Buddy's presence information received

S42: send RTP packet using port bound to codec

S43: decode with codec bound to RTP packet receiving port

The present invention relates to a presence service (UE) terminal and a method for transmitting / receiving a Real-time Transport Protocol (RTP) packet thereof. More particularly, the presence service terminal provides codec and port information necessary for negotiation of an RTP session to the presence information. The present invention relates to a presence service terminal and an RTP packet transmission / reception method thereof, which transmits and receives an RTP packet immediately without an RTP session negotiation process when transmitting and receiving an RTP packet.

The presence service receives and stores the presence information representing the possibility of communication, and delivers the presence information when a user registered as a buddy connects to the presence server. Presence services include communication means such as instant messaging, VoIP, mobile phones, e-mail, willingness and voice mail to communicate, such as in case of emergency or always by e-mail, voice or video, mobile or fixed, various languages, etc. Communication capabilities and characteristics.

RTP is an Internet protocol for transmitting real-time data such as audio and video. Although RTP itself does not guarantee real-time transmission of data, transceiving applications provide an apparatus for supporting streaming data. RTP generally runs on User Datagram Protocol (UDP) to achieve high transfer rates.

Assuming a situation in which real-time data such as audio or video is transmitted and received between terminals subscribed to the presence service, each terminal should transmit and receive real-time data using RTP. At this time, in order to transmit and receive the RTP packet, it is necessary to first negotiate a process of establishing an RTP session by negotiating a codec and UDP port number to be used. Therefore, there is a problem that the transmission and reception of real-time data is delayed.

A conventional method of transmitting and receiving an RTP packet between presence service terminals will be described with reference to FIG. 1.

The terminal transmits its own presence information to the server (S10).

Preferably, the presence information includes a current status of the person, a screen name, a list of buddies registered by the user, and the like.

Each terminal receives the presence information of the terminals registered as its buddy from the server (S11).

When the terminal intends to transmit real-time data to the counterpart terminal, it negotiates an RTP session establishment for transmitting / receiving real-time data with the counterpart terminal (S12).

In the session establishment negotiation, it is preferable to negotiate that the information about the UDP port for transmitting and receiving data and the codec in which the data is encoded is matched between the transmitting terminal and the receiving terminal.

When the session establishment negotiation is completed, an RTP session is created between the transmitting terminal and the receiving terminal to transmit and receive the RTP packet.

When the RTP session is generated between the transmitting terminal and the receiving terminal, the transmitting terminal transmits and receives real time data using the RTP with the receiving terminal (S13).

According to the RTP packet transmission / reception method, when the real-time data is transmitted and received using the RTP of the presence system terminal, first, a session establishment negotiation with the counterpart terminal is required, and thus, a procedure is complicated and a separate time is required for session establishment negotiation. .

The present invention is to solve the above problems, the presence service terminal informs the buddy terminal of its own session configuration information in advance, the RTP packet using the session configuration information received in advance without the session negotiation process when transmitting and receiving the RTP packet of the terminal An object thereof is to provide a presence service terminal for transmitting and receiving a RTP packet transmission and reception method thereof.

RTP packet transmission and reception method of the presence service terminal according to an aspect of the present invention for achieving this object, transmitting the presence information including the RTP session establishment information to the server, transfer the presence information of the buddy from the server Receiving and storing RTP session setting information from the presence information of the receiving terminal, which is transmitted from the server, and storing the RTP session setting information accordingly, and transmitting the RTP packet to the receiving terminal accordingly; Processing the RTP packet according to the information.

Preferably, the RTP session establishment information includes binding port information for each codec indicating its own receiving port for each codec.

The transmitting to the receiving terminal may include inquiring a binding port of a codec encoded with real-time data from the presence information of a receiving terminal transmitted from a server and transmitting an RTP packet to the receiving terminal through the inquired port. It is preferably a step.

The processing of the RTP packet is preferably a step of decoding using a codec bound to a receiving port when the RTP packet is received.

The binding port information for each codec is information indicating a receiving port of a terminal for each codec. When the transmitting terminal transmits real-time data encoded with a specific codec, the binding port information should be transmitted to the binding port for the codec designated by the receiving terminal. Information that means

If the codec is different, the binding port information for each codec is preferably different receiving port bound to it.

The presence information transmitting step may be a step of transmitting the presence information including the changed codec binding port information to the server whenever there is a change in the binding port information for each codec.

The transmitting of the RTP packet includes: when the transmission of the packet starts, setting the status value of the port to be used as the transmission to BUSY and including it in the presence information and transmitting it to the server. Set to IDLE and include in the presence information and transmit to the server.

The receiving step of the RTP packet, when the reception of the packet is started, the status value of the port to be used for reception is set to BUSY and included in the presence information and transmitted to the server, the status value of the port used for reception upon completion of the packet reception Set to IDLE and include in the presence information and transmit to the server.

The transmitting of the RTP packet may include inquiring a state value of a port to be used for receiving an RTP packet from a receiving terminal from the presence information of the receiving terminal before transmitting the packet, and a state of a port to be used for receiving an RTP packet of the receiving terminal. If the value is BUSY, it is preferable to further include transmitting an RTP packet after waiting until the status value of the port is IDLE.

Presence service terminal according to an aspect of the present invention, a network interface unit connected to the network and interface between the other terminal and the terminal, the presence information including the binding port information for each codec to generate a presence to transmit to the server The information transmission unit, the buddy information management unit for storing and managing the presence information of the buddy provided from the server in the storage unit, and inquiring the binding port of the transmission data codec from the presence information of the receiving terminal stored in the storage unit, RTP transmitter for transmitting the RTP packet through, RTP packet receiving means for causing the codec unit to decode using its binding codec for the receiving port, if the RTP packet is received and a codec unit responsible for encoding / decoding the real-time data Save presence information of control means and buddy Binding includes storage to store the port information portion.

After the presence information transmitter transmits the presence information to the server, the RTP receiving unit allocates and listens to the binding UDP ports for each codec, so that RTP packets can be received through each binding port. Do.

The presence information transmitter preferably transmits the presence information including the binding port information for each codec to the server whenever there is a change in the binding port information for each codec.

The presence information transmitting unit may further include whether the port is BUSY / IDLE in the presence information and transmit the same to the server.

When the transmission and reception of the RTP packet is started, the presence information transmitting unit transmits the transmission / reception port state value set to BUSY to the server, including the presence information, and presents its transmission / reception port state value set to IDLE when the transmission and reception of the packet is completed. It is preferable to transmit the information to the server in addition to the service information.

The RTP transmitting unit inquires the transmission port state of the receiving terminal in the binding port storage unit for each codec before transmitting the RTP packet, and if the state is BUSY, waits until the state becomes IDLE, and then the state becomes IDLE. It is preferable to transmit the RTP packet to the receiving terminal.

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

In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

2 is a diagram illustrating a detailed configuration of a presence service terminal according to the present invention.

As shown in FIG. 2, the presence service terminal of the present invention includes a control unit 200, a storage unit 210, and a network interface unit 220.

The control unit 200 generates the presence information and controls the storage unit 210 and the network interface unit 220 to transmit and receive the RTP packet, and is responsible for encoding and decoding the codec.

The storage unit 210 stores the presence information of the buddies and stores binding ports for respective codecs.

The network interface unit 220 is connected to a network to interface the terminal with the server and other terminals.

As shown in FIG. 3, the control means 200 includes a presence information transmitter 201, a buddy information manager 202, an RTP transmitter 203, an RTP receiver 204, and a codec unit 205.

The presence information transmitting unit 201 inquires binding port information for each codec stored in the storage unit 210, generates presence information including the same, and transmits the presence information to the server.

The buddy information manager 202 stores and manages the presence information of the buddy received from the server in the storage unit.

The RTP transmitter 203 inquires the binding port of the transmission data codec from the presence information of the receiving terminal stored in the storage unit, and transmits the RTP packet to the port inquired through the network interface unit 220.

When the RTP packet is received, the RTP receiving unit 204 inquires the binding port information for each codec stored in the storage unit 210 to determine its own binding codec for the port where the RTP packet is received, and then uses the codec to the codec unit. To decode.

The codec unit 205 is responsible for encoding / decoding real time data.

Hereinafter, the operation of the presence service terminal according to the present invention will be described.

First, a process of generating and transmitting the presence information to the server and receiving the presence information of the buddy from the server will be described.

Codec-specific binding port information predefined or arbitrarily generated by an administrator is stored in the storage unit 210.

The coded binding port information for each codec is different if the coded port is different.

The presence information transmitter 201 generates presence information including binding port information for each codec stored in the storage 210, and then transmits the generated presence information to the server through the network interface 220.

In the presence information, it is preferable to include binding port information for each codec in the existing presence information such as a screen name, a current state, and a buddy list.

The presence information transmitter 201 may generate the presence information including the same whenever a change occurs in the binding port information for each codec, and transmit the presence information to the server so that the other terminal knows this.

After the presence information transmitter 201 transmits the presence information to the server, the RTP receiving unit 204 allocates and listens to the binding UDP ports for each codec, thereby receiving RTP packets through each binding port. It is desirable to make this possible.

When the buddy information manager 202 receives the presence information of the buddy from the server through the network interface unit 220, the buddy information management unit 202 stores the buddy information management unit 202 in the storage unit 210.

Next, the transmission and reception of the RTP packet will be described.

The codec unit 205 encodes data using a codec suitable for data to be transmitted, and the RTP transmitter 203 inquires a binding port of the codec from the presence information of the receiving terminal stored in the storage 210, Sends an RTP packet of encoded data to the inquired port.

When the RTP packet is received, the RTP receiving unit 204 determines the codec used by the RTP packet using the receiving port from the binding port information for each codec stored in the storage unit 210 and causes the codec unit 205 to decode the RTP packet. .

When the transmission or reception of the RTP packet starts, the presence information transmitter 201 sets the status value of the transmission or reception port to BUSY, generates the presence information including the same, and transmits the presence information to the server, and the transmission or reception of the RTP packet is completed. When the status value of the transmission or reception port is set to IDLE, it is preferable to generate the presence information including the same and transmit it to the server.

The RTP transmitting unit 203 inquires from the presence information of the receiving terminal stored in the storing unit 210 the status of the receiving terminal port to be used for transmission before transmitting the RTP packet, and if the status is BUSY, the status will be IDLE. After waiting until the state becomes IDLE, it is preferable to transmit the RTP packet to the receiving terminal.

3 is a diagram illustrating an embodiment of transmitting and receiving an RTP packet of a presence service terminal according to the present invention.

Although the presence system including the presence service terminal according to the present invention includes at least one terminal and a server, the present embodiment assumes a system consisting of three terminals and a server.

As shown in FIG. 3, the presence system including the presence service terminal according to the present invention includes a server 30, a terminal 1 31, a terminal 2 32, and a terminal 3 33.

The server 30 receives the presence information including the binding port information for each codec from the terminal 1 (31), the terminal 2 (32), and the terminal 3 (33), and transmits the presence information to the terminal in which the terminal is registered as a buddy. .

The terminal 1 (31), the terminal 2 (32), and the terminal 3 (33) transmits the presence information including the binding port information for each codec to the server, and when the RTP packet is transmitted, the codec included in the presence information of the counterpart terminal Inquires the receiving port of the codec used by the data to be transmitted from the binding port information of each star and transmits the RTP packet by using it. When the RTP packet is received, it is decoded by the codec bound to the receiving port.

Hereinafter, the operation of the presence system including the presence service terminal according to the present invention will be described.

First, an operation in which the terminal 1 31, the terminal 2 32, and the terminal 3 33 transmit the presence information to the server and receive the presence information of the buddy from the server will be described.

Terminal 1 (31) is a terminal 2 (32) is registered as a buddy, codec A is bound to UDP port 100 and codec B is bound to UDP port 200.

Terminal 2 (31) is a terminal 1 (31), terminal 3 (33) is registered as a buddy, codec A is bound to UDP port 200 and codec B is bound to UDP port 300.

Terminal 3 (31) is a terminal 2 (32) is registered as a buddy, codec A is bound to UDP port 50 and codec B is bound to UDP port 100.

When the first terminal 31, the second terminal 32, and the third terminal 33 access the server for the first time, the terminal 30 transmits the presence information including the binding port information for each codec to the server 30.

The transmission of the presence information is preferably performed whenever there is a change in the binding port information and the presence information.

The server 30 transmits the presence information of each terminal to the terminal registered as a buddy. That is, the presence information of the terminal 1 (31) is transmitted to the terminal 2 (32), the presence information of the terminal 2 (32) is transmitted to the terminal 1 (31), the terminal 3 (33), the terminal 3 (33) ) Presence information is transmitted to the terminal 2 (32).

Each terminal receives and stores the presence information of the buddy from the server (30).

Next, a case in which each terminal transmits an RTP packet to a counterpart terminal will be described.

In particular, a case in which the terminal 1 31 transmits the speech data encoded by the codec A to the terminal 2 32 will be described.

Since the terminal 1 31 registers the terminal 2 32 as a buddy, the terminal 1 31 receives the presence information of the terminal 2 32 from the server 30.

Inquiring the port bound to the codec A from the presence information of the terminal 2 (32) it can be seen that the port 200.

The terminal 1 31 transmits the voice data encoded by the codec A to the terminal 2 32 using the RTP of the port 200 without negotiating the RTP session.

Next, a case in which each terminal receives an RTP packet from a counterpart terminal will be described.

In particular, a case in which the terminal 2 32 receives voice data encoded by the codec A from the terminal 1 31 will be described.

In the case where the terminal 1 31 transmits the voice data encoded by the codec A to the terminal 2 32, as in the salpin bar, the terminal 1 31 transmits the data through the port 200.

When the terminal 2 32 receives the RTP packet, the terminal 2 32 checks the port where the packet is received.

Since the port on which the packet was received is bound to the codec A at 200, the terminal 2 32 directly decodes the received RTP packet by the codec A.

4 is a diagram illustrating a method of transmitting and receiving an RTP packet by a presence service terminal according to the present invention.

Codec-specific binding port information is included in the presence information and transmitted to the server (S40).

Preferably, the coded binding port information is different when the codec is bound.

Preferably, the step of transmitting the presence information further includes the step of transmitting the presence information to the server and listening to the binding port for each codec to receive the RTP packet received at the listening port. .

The presence information of the buddy is received from the server and stored (S41).

The transmitting terminal inquires the receiving terminal binding port of the codec encoded with real-time data from the presence information of the receiving terminal, and transmits an RTP packet to the receiving terminal through the inquired port (S42).

When the receiving port state value of the receiving terminal is BUSY, the transmitting terminal waits until the receiving port state value becomes IDLE, and then transmits an RTP packet.

When the transmitting terminal starts transmitting the RTP packet, the transmission terminal sets the status value of the transmission port to BUSY and transmits it to the server including the presence information, and after completing the transmission of the RTP packet, the transmission port status is set to IDLE. It is desirable to set and include this in the presence information and send it to the server.

When the RTP packet is received, the receiving terminal decodes using a codec bound to the receiving port (S43).

When the receiving terminal starts receiving the RTP packet, the receiving terminal sets the status value of the receiving port to BUSY and transmits it to the server including the presence information, and after completing the receiving of the RTP packet, sets the status value of the receiving port to IDLE. It is desirable to set and include this in the presence information and send it to the server.

As described above, according to the presence service terminal and the method for transmitting / receiving the RTP packet according to the present invention, RTP packets are transmitted and received between each terminal by transmitting and receiving the information necessary for establishing an RTP session such as a codec and a port in advance. In this case, RTP packets can be directly transmitted and received without negotiating RTP session establishment.

Claims (14)

In the presence service terminal RTP packet transmission and reception method, Transmitting the presence information including the RTP session establishment information to the server; Receiving presence information of buddies from a server and storing the presence information; And And establishing an RTP session according to the RTP session establishment information included in the presence information between terminals. The method of claim 1, Setting up the RTP session, And transmitting and receiving an RTP packet according to the RTP session establishment information included in the presence information. The method of claim 2, The RTP session establishment information is RTP packet transmission / reception method of presence service terminal which is binding port information for each codec. The method of claim 3, Transmitting and receiving the RTP packet, Querying the binding port of the codec used by the data to be transmitted in the presence information of the receiving terminal and transmitting the RTP packet to the receiving terminal through the inquired port; Wow When the RTP packet is received from the transmitting terminal, the RTP of the presence service terminal including an RTP packet receiving step of inquiring the codec bound to the receiving port in the binding port information of each codec and decoding using the inquired codec. How to send and receive packets. The method of claim 3, The step of transmitting the presence information to the server, After transmitting the presence information, by listening to the port assigned for each codec by listening, RTP packet transmission and reception method of the presence service terminal further comprising the step of enabling the reception of the RTP packet through the listening port. The method of claim 3, The step of transmitting the presence information to the server, And transmitting the presence information including the changed codec-specific binding port information to the server whenever there is a change in the codec-specific binding port information. The method of claim 4, wherein The step of transmitting the RTP packet to the receiving terminal, Setting a transmission port state to BUSY and transmitting the packet to the server when the packet transmission starts; Wow Setting the transmission port state to IDLE upon completion of the transmission of the packet and including the presence information in the presence information to transmit to the server; The RTP packet receiving step, Setting the reception port state to BUSY when the reception of the packet is started and including the presence information in the presence information to transmit to the server; Wow And setting the reception port state to IDLE when the packet is received and including the information in the presence information and transmitting the same to the server. The method of claim 7, wherein The step of transmitting the RTP packet to the receiving terminal, Querying a binding port state value of a codec used by data to be transmitted from presence information of a receiving terminal, which is transmitted from a server; Wow If the status value of the port is BUSY RTP packet transmission and reception method of the presence service terminal further comprising the step of transmitting the real-time data after waiting until the status value of the port IDLE. In the presence service terminal, Generate the presence information including the RTP session configuration information, store the presence information of the buddy in the storage unit, and control the network interface unit to transmit the RTP packet according to the RTP session configuration information of the receiving buddy when transmitting the RTP packet. Control means for processing the RTP packet according to its RTP session establishment information upon receiving the RTP packet; A network interface unit for transmitting and receiving the presence information with the server under the control of the control means, and for transmitting and receiving the RTP packet with the counterpart terminal; And Presence service terminal comprising a storage unit for storing the presence information of the buddy. In the presence service terminal, Generate the presence information including the binding port information for each codec, store the presence information of the buddy in the storage, and transmit the transmission port to the encoding codec binding port of the receiver presence service terminal stored in the storage when transmitting the RTP packet. Control means for determining and retrieving and decoding the decoding codec from the binding port information for each codec stored in the storage unit when receiving the RTP packet; Transmits the presence information generated by the control means to the server, transmits an RTP packet to the receiving side presence service terminal through the transmission port determined by the control means, and transmits the presence information of the buddy from the server to the control means. A network interface unit configured to provide a control unit together with a reception port when an RTP packet is received from a transmission side presence service terminal; And Presence service terminal including a storage for storing the presence information of the buddy and the binding port information for each codec. The method of claim 10, The control means, A presence information transmitter for generating presence information including binding port information for each codec, a buddy information manager for storing and managing the presence information of the buddy in the storage unit, and a transmission data codec from the presence information of the receiving terminal stored in the storage unit. An RTP transmitter for providing the port to the network interface as the transmission port, when the RTP packet is received, an RTP packet receiver for decoding the codec unit using its binding codec for the reception port; Presence service terminal comprising a codec unit for encoding and decoding real-time data. The method of claim 11, The presence information transmitter, Presence service terminal for generating the presence information further including whether the transmission and reception port BUSY / IDLE. The method of claim 12, The RTP transmitter, Before sending the RTP packet, the storage unit inquires the transmission port status of the receiving terminal, if the status is BUSY, waits until the status is IDLE, and if the status is IDLE, sends the RTP packet to the receiving terminal. A presence service terminal for controlling a network interface unit. In the presence service system, A server for receiving and storing the presence information including the RTP session establishment information from the terminal and delivering the same to the terminal at the request of the terminal; Wow Send the presence information including the RTP session establishment information to the server, request and store the presence information of the buddy to the server, and store and receive and transmit an RTP packet according to the RTP session establishment information included in the presence information between terminals. Presence service system comprising a terminal to.

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