KR100608841B1 - Method for transmitting mms message upon splitting and performing automatic re-transmission thereof - Google Patents

Abstract

The present invention relates to an automatic retransmission method capable of dividing and transmitting an MMS message transmitted and received between a mobile terminal and a server in a mobile communication system, and actively coping with an error occurring during the transmission. In the transmission of this large MMS message, if an error occurs during the message transmission, instead of sending all the messages again, it is possible to send from the PDU in which the error occurred, to solve the error occurring during the message transmission on the upper application layer, and to automatically retransmit the message. By doing so, you can check and cope with errors occurring in the lower layer as well as the corresponding layer.

MMS, split transfer, retransmit, PDU

Description

METHOD FOR TRANSMITTING MMS MESSAGE UPON SPLITTING AND PERFORMING AUTOMATIC RE-TRANSMISSION THEREOF}

1 is a configuration diagram showing an example of a general mobile communication system to which the present invention can be applied.

2 is a flowchart illustrating a process of transmitting an MMS message according to an embodiment of the present invention.

3 is a flowchart illustrating a process of transmitting an MMS message according to another embodiment of the present invention.

4 is a flowchart illustrating an implementation process of an MMS message segmentation transmission and automatic retransmission method according to the present invention.

******* Explanation of symbols for main parts of drawings *******

110: transmitting side mobile communication terminal 120: receiving side mobile communication terminal

130: MMSC

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system. In particular, the present invention relates to a mobile communication system that automatically divides and transmits a multimedia messaging service (MMS) message transmitted and received between a mobile terminal and a server and actively copes with errors during transmission. Retransmission method.

In general, MMS refers to a service that transmits and receives a message including various multimedia data such as pictures, pictures, voice, music, and video as well as simple text using a user's mobile communication terminal. Through the MMS, the user could transmit a relatively large MMS message to the counterpart terminal.

The MMS is an evolution from the short message service (SMS), which is a text-oriented message service, and is based on an SMS message transmission scheme. Therefore, in the related art, when a user transmits an MMS message to a mobile communication terminal of a desired counterpart using a mobile communication terminal, data of the message is transmitted at once through an MMSC (MMS Center) serving as an intermediate base station.

Therefore, when a call is disconnected or a network error occurs while transmitting an MMS message, there is a problem in the related art that all MMS messages transmitted from a transmitting terminal to an MMSC or from an MMSC to a receiving terminal must be retransmitted.

In addition, there is a problem that radio resources are unnecessarily wasted due to the above problem of message retransmission.

The present invention has been proposed to solve the above problems, and an object of the present invention is to divide and transmit an MMS message transmitted and received between a mobile terminal and a server in a mobile communication system and to actively cope with errors during transmission. The present invention provides a method of splitting and automatically retransmitting a message.

In order to achieve the above object, the method for splitting and automatically retransmitting an MMS message according to the present invention includes: dividing an MMS message to be transmitted by a transmitter into PDUs of a plurality of MM1 protocols and sequentially transmitting one by one; Confirming a response message from a receiver each time one PDU is transmitted; If the response message is a message transmission error-related message, after stopping the PDU transmission, the cause of the error between the sender and the receiver is resolved in the application layer and retransmitted from the last transmitted PDU.

Preferably, the transmitted PDU is characterized in that it comprises a specific field indicating the order of the PDU. The first PDU of the transmitted PDUs has a specific field value indicating the order of the PDUs is 0 or does not include the corresponding field. The specific field includes a field name indicating a field attribute, a field value indicating a sequence of PDUs, and a description indicating a type of a field.

Preferably, the response message related to the message transmission error is characterized in that the value of the field value is <Error-message-sending-count>.

Preferably, If the response message is not a message related to a message transmission error, transmitting a next PDU; If all the divided PDUs are transmitted and the response message from the receiver after the last PDU transmission is Ack, the method further comprises releasing the radio connection. The response message not related to the message transmission error is Ack (Acknowledge) that the message is properly received at the receiver.

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

In describing the present invention, when it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a configuration diagram showing an example of a general mobile communication system to which the present invention can be applied.

As shown in Figure 1, the mobile communication system is largely composed of a mobile communication terminal (110, 120) and MMSC (130). The mobile communication terminals 110 and 120 and the MMSC 130 transmit and receive messages and data through a protocol called MM1. The MM1 is a third Generation Partnership Project: a protocol (3 ^rd Generation Partnership Project 3GPP) Seventh Layer (Application Layer) which is responsible for the exchange of information between applications via the network defined by the interface between the mobile communication terminal and the MMSC by . A message transmission process between each unit will be described with reference to FIG. 2.

2 is a flowchart illustrating a process of transmitting an MMS message according to an embodiment of the present invention.

When the MMS message is first created and transmitted by the mobile communication terminal 110, the data of the message is divided into protocol data units (PDUs) and sequentially transmitted to the MMSC 130. Each PDU adds a predetermined information field as shown in Table 1 below to allow the MMSC to recognize the content of the transmitted message and the order of the PDUs.

property form Field name <X-Mms-packet-value> Field value <Packet-count-value> Description <Optional>

By analyzing the contents of the information field as described above, it is easy to identify the number of PDUs among the MMS messages divided into a plurality of PDUs. Therefore, when an error occurs during the transmission of the MMS message, it is possible to know from which PDU the error occurred, and transmission from the corresponding PDU is possible.

The contents of the field value <packet-count-value> indicate the sequence number of the PDU, and the Filed value is displayed as 0 in the first PDU or the field is not added at all. That is, when the field value is 0 when PDUs are sent in order of 0, 1, 2, 3, ..., N, it can be seen that the corresponding PDU is the first PDU. In addition, if the PDU is sent in the order number of 1, 2, 3, ..., N, if the PDU does not have the field, the corresponding PDU may be regarded as the first PDU.

In addition, the first PDU includes information on the content and size of the message in the header field as in the case of sending a normal MMS message. Hereinafter, a detailed PDU transmission procedure will be described with reference to FIG. 2.

Referring to FIG. 2, the transmitting terminal 110 transmits the PDU1 containing the contents of the Send Request to the MMSC 130 in order to inform that the first message transmission is started (S202). As described above, the field value of PDU1 which is the first PDU may be 0 or there may be no corresponding field.

Receiving the PDU1, the MMSC 130 can know the contents of the message and how many total PDUs (what the message size) by referring to the header field of the PDU1, the information added by the present invention The field is referred to as the first PDU of all the PDUs. After confirming the necessary information, the MMSC 130 grants the message transmission acknowledgment to the transmitting terminal 110 and sends an Ack (Acknowledge) that the PDU has been normally received (S204). The Ack also includes the same information field as the field added to the PDU. As a result, the terminal receiving the Ack or the MMSC can know up to which PDU the transmission was successful.

The transmitting terminal 110 receiving the Ack transmits PDU2, which is the second PDU (S206), and the MMSC 130 receiving the PDU2 transmits the Ack in response (S208). Upon receiving the Ack, the transmitting terminal 110 transmits PDU3 (S210), and receives the Ack from the MMSC 130 again (S212). As described above, the PDU and its Ack are sequentially transmitted. If no error occurs until the last PDU and the Ack are transmitted, the transmission of the MMS message is completed.

Next, in the transmission of the receiving side, the MMSC 130 transmits the PDU1 containing the contents of the Send Request to the receiving terminal 120 to inform that the first message transmission is started (S220). As described above, the field value of PDU1 which is the first PDU may be 0 or there may be no corresponding field.

Receiving terminal 120 receiving the PDU1 can refer to the header field of the PDU1 to know what the contents of the message, how many total PDUs (what the size of the message), added by the present invention The information field is referred to as the first PDU of all the PDUs. Upon receipt of the necessary information, the receiving terminal 120 acknowledges the message transmission to the MMSC 130 and sends an Ack (Acknowledge) that the PDU has been normally received (S222).

The MMSC 130 receiving the Ack transmits PDU2, which is the second PDU (S224), and the receiving terminal 120 receiving the PDU2 transmits the Ack in response (S226). The MMSC 130 receiving the Ack transmits PDU3 (S228), and receives the Ack from the receiving terminal 120 again (S230). As described above, the PDU and its Ack are sequentially transmitted. If no error occurs until the last PDU and the Ack are transmitted, the receiving side of the MMS message is completed.

3 is a flowchart illustrating an MMS message transmission process according to another embodiment of the present invention, MMS message segmentation transmission and automatic retransmission method.

Referring to FIG. 3, the sender terminal 110 transmits a PDU1 including a Send Request content to the MMSC 130 to inform that the first message transmission starts (S302). As described above, the field value of PDU1 which is the first PDU may be 0 or there may be no corresponding field.

Receiving the PDU1, the MMSC 130 can know the contents of the message and how many total PDUs (what the message size) by referring to the header field of the PDU1, the information added by the present invention The field is referred to as the first PDU of all the PDUs. After confirming the necessary information, the MMSC 130 grants a message transmission acknowledgment to the transmitting terminal 110 and sends an Ack (Acknowledge) that the PDU has been normally received (S304). The Ack also includes the same information field as the field added to the PDU. As a result, the terminal receiving the Ack or the MMSC can know up to which PDU the transmission was successful.

Upon receiving the Ack, the transmitting terminal 110 transmits the second PDU PDU2 (S306), and the MMSC 130 receiving the PDU2 transmits the Ack in response (S308). Upon receiving the Ack, the transmitting terminal 110 transmits the PDU3 (S310). If the MMSC does not properly receive the PDU3 due to a call transfer or network error during the transmission of the PDU3, the MMSC sends an Ack for the PDU3. Instead of transmitting, the error information value of the form <Error-message-sending-count> is displayed on the <X-Mms-packet-value> constituting the field name field of the response message and transmitted to the transmitting terminal 110. (S312). The transmitting terminal 110 recognizes that an error has occurred from the error information value included in the response message and temporarily stops transmitting the PDU. In addition, it recognizes the error occurred in the PDU, and finds the cause of the error between the transmitting side (terminal 110) and the receiving side (MMSC 130) to solve the cause of the error in the application layer (S314). If the problem is not solved immediately, such as a network problem, the sending terminal 110 stops the MMS message transmission itself and informs the user of the message transmission stop and its cause.

If the cause of the error is solved, the transmitting terminal 110 checks from the error information value included in the response message in which PDU the transmission is stopped and resumes transmission from PDU3 again (S316), MMSC Ack is received from 130 (S318). As described above, the PDU and its Ack are sequentially transmitted. If no error occurs until the last PDU and the Ack are transmitted, the transmission of the MMS message is completed.

Next, in the transmission of the receiving side, the MMSC 130 transmits the PDU1 containing the contents of the Send request to the receiving terminal 120 to inform that the first message transmission starts (S330). As described above, the field value of PDU1 which is the first PDU may be 0 or there may be no corresponding field.

Receiving terminal 120 receiving the PDU1 can refer to the header field of the PDU1 to know what the contents of the message, how many total PDUs (what the size of the message), added by the present invention The information field is referred to as the first PDU of all the PDUs. Upon receipt of the necessary information, the receiving terminal 120 acknowledges the message transmission to the MMSC 130 and sends an Ack (Acknowledge) indicating that the PDU has been normally received (S332).

The MMSC 130 receiving the Ack transmits PDU2, which is a second PDU (S334), and when a call transfer or network error occurs during transmission of the PDU2, the receiving terminal 120 does not properly receive the PDU2. Instead of transmitting the Ack for the PDU2, the receiving terminal 120 has error information in the form of <Error-message-sending-count> in <X-Mms-packet-value> constituting the Field Name field of the response message. The value is displayed and transmitted to the MMSC 130 (S336). The MMSC 130 recognizes that an error has occurred from the error information value included in the response message and temporarily stops transmission of the PDU. In addition, it recognizes the error occurred in the PDU, and finds the cause of the error between the transmitting side (MMSC 130) and the receiving side (terminal 120) to solve the cause of the error in the application layer (S338). If the problem is not solved immediately, such as a network problem, MMSC 130 stops the transmission of the MMS message itself, and informs the user of the message transmission interruption and its cause through the transmission of SMS messages.

When the cause of the above error is solved, the MMSC 130 checks from the error information value included in the response message, at which PDU the transmission is stopped, and resumes transmission from PDU2 again. PDU2 containing the packet is transmitted (S340), and the Ack is received from the receiving terminal 120 (S342). The MMSC 130 receiving the Ack transmits PDU3 (S344), and receives the Ack from the receiving terminal 120 again (S346). As described above, the PDU and its Ack are sequentially transmitted. If no error occurs until the last PDU and the Ack are transmitted, the reception side of the MMS message is completed.

4 is a flowchart illustrating an implementation process of an MMS message segmentation transmission and automatic retransmission method according to the present invention.

Referring to FIG. 4, when the transmission of the first MMS message is set, the sender divides the MMS messages into PDUs of a plurality of MM1 protocols (S410) and sequentially transmits them one by one (S420).

The transmitting side that transmits the PDU checks the response message from the receiving side every time the PDU is transmitted (S430), and the response message is a response message when the PDU has been received, or a response message when the PDU has not been received. It determines the recognition (S440).

As a result of the determination, if the response message is a response message when the reception of the PDU is not completed, the PDU transmission is stopped, and the cause of error between the transmitter and the receiver is found and resolved (S450). To resume, it transmits from the last PDU previously transmitted (S460).

As a result of the determination, if the response message is a response message when the reception of the PDU is completed, it is determined whether all PDUs have been transmitted (S470).

If the transmission of all PDUs is not completed, return to step S420 of transmitting the PDUs in order, and repeat the above steps S420 to S470. That is, the next PDU is transmitted, the response message is confirmed, and the corresponding processing is performed.

On the other hand, when the transmission of all the PDU is completed, the wireless connection is released by completing the MMS message transmission (S480).

In addition, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, in the MMS message segmentation transmission and automatic retransmission method according to the present invention, even if an error occurs during the transmission of a rather large MMS message, the message is not transmitted again but transmitted from the PDU where the error occurred. By doing so, it is possible to save radio resources.

In addition, the present invention can cope with message transmission errors more proactively by resolving errors occurring during message transmission in the upper layer and performing automatic retransmission of messages, so as to identify and cope with errors occurring in the lower layer as well as the corresponding layer. It has an effect.

Claims (9)

Dividing an MMS message to be transmitted by the transmitting side into PDUs of a plurality of MM1 protocols and sequentially transmitting one by one; Confirming a response message from a receiver each time the one PDU is transmitted; If the response message is a message transmission error-related message, the step of stopping the PDU transmission, the cause of the error between the sender and the receiver is solved in the application layer and retransmitted from the last PDU transmitted, characterized in that Split transmission and automatic retransmission method. The method of claim 1, wherein the transmitted PDU is Method for split transmission and automatic retransmission of MMS messages comprising a specific field indicating the order of the transmitted PDU. The method of claim 2, wherein the first PDU of the transmitted PDUs are Partial transmission and automatic retransmission method of MMS message, characterized in that the value of a specific field indicating the order of the PDU is 0. The method of claim 2, wherein the first PDU of the transmitted PDUs are Partial transmission and automatic retransmission method of MMS message, characterized in that it does not have a specific field indicating the order of the PDU. The method of claim 2, wherein the specific field is And a field value indicating a field attribute indicating a field attribute, a field value indicating a sequence of PDUs, and a description indicating a type of a field. The method of claim 1, wherein the response message related to the message transmission error is Method for split transmission and automatic retransmission of MMS message, characterized in that the value of the field value is <Error-message-sending-count>. The method of claim 1, And if the response message is not a message related to a message transmission error, transmitting the next sequence of PDUs. 8. The method of claim 7, wherein the response message not related to the message transmission error is Partial transmission and automatic retransmission method of MMS message, characterized in that Ack (Acknowledge) that the message was properly received at the receiving side. The method of claim 1, And releasing the radio connection if all of the divided PDUs are transmitted and the response message from the receiver after the last PDU transmission is Ack.

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