KR101007408B1 - Data sharing based data transfer method and system - Google Patents

Abstract

PURPOSE: A data sharing-based data transmission method and a system thereof are provided to transmit the data through data sharing between terminals, which lost connectivity about destination node in a disaster/rescue and war environment. CONSTITUTION: An application program transmits user request transmission data to destination address/port information to a ODTM(Opportunistic Data Transfer Manager)(510). If data transmission is impossible, the ODTM transmits the data to a data sharing manager(520,522). If a terminal connects to an ad-hoc network, the data sharing manager generates a Data_Transfer_Request message(532). The data sharing manager broadcasts the message to another terminals(540).

Description

DATA SHARING BASED DATA TRANSFER METHOD AND SYSTEM}

The present invention relates to a method and a system for transmitting user data in an environment in which connectivity with a destination node that is connected through a backbone network of a user terminal is not always maintained and is frequently disconnected. In particular, a user who has lost connectivity to a destination node The present invention relates to a method for delivering data of a user terminal by sharing data when an ad hoc communication group can be formed between terminals, and a system for implementing the same.

In the absence or destruction of existing infrastructure, such as disaster / rescue and wartime environments, it is not possible to guarantee continuous connection with the user terminal network. That is, the connection to the destination node of the user terminal may be frequently disconnected.

1 is a flow chart of a user data transmission process according to the prior art in an environment where connection to a network is frequently disconnected.

Conventional data transmission services generally do not provide the service itself or the user, even if the user terminal has two or more communication interfaces, unless it is connected to a server or another terminal that provides a network service through any one communication network. Even when the data transmission request is made (100), an error message regarding disconnection with the network is output (114).

Data that is requested by the user but not transmitted is immediately deleted or temporarily stored in the memory. In order to complete the data transmission, the user must directly retransmit the data while the terminal is connected to the communication network. That is, when the conventional data transmission service fails to process a user data transmission request immediately due to a network connection failure, the user is notified of the transmission failure and no longer participates in the transmission request, and the attempt to retransmit the data is sent to the user. It worked in a loose manner.

In a normal environment, a network connection failure of a user terminal due to a failure or absence of a communication network rarely occurs, and even if a failure or absence of a communication network occurs, it is quickly recovered by a network operator. Therefore, a network connection failure or disconnection of the terminal is temporary. to be. In addition, when the network connection is restored, the user can receive the information about the service quickly from the service provider. Therefore, even in an environment in which a conventional data transmission service method and system are used, the user may not have a problem due to inconvenience or disconnection of the network.

However, in a disaster / rescue or war environment, the user's terminal may be damaged due to various unexpected reasons different from the normal environment, such as when the network is destroyed due to a disaster or enemy attack or when the military unit belongs to an area where the network is not established. Network connection failure will occur. In particular, in the exhibition environment, since the base facilities such as base stations and relay stations can be frequently moved or temporarily installed, users often experience network connection failure or network disconnection of the terminal. In addition, the duration of the network connection failure is variable compared to the normal environment according to the communication network recovery / hypothesis speed of the region, the user's movement speed and movement pattern.

In such a disaster / rescue or exhibition environment, it is difficult for the user to determine the timing of the network connection of the terminal, and for the success of data transmission, the user has no choice but to constantly monitor the network connection state of the terminal. In particular, it is impossible to determine whether the path disconnection with the destination has occurred due to network disconnection before the user attempts to transmit the data continuously. However, it is unrealistic to assume that in a disaster / rescue or exhibition environment, users generally perform special tasks, and thus it is possible to monitor the network connection status of the terminal and attempt to retransmit data. Accordingly, there is a need for a new method for minimizing the load of a user and a system for supporting the same, rather than a method for recognizing a network connection state or a network connection state of a terminal and attempting to retransmit data, as in a conventional data transmission service.

Since the data mainly transmitted in the disaster / rescue or wartime environment may be data related to emergency rescue service requests, reporting on the surrounding situation / environment, movement location and operation, it is most important that the data are delivered to the destination quickly. As soon as the network is connected, it needs to be delivered. However, as mentioned earlier, in a disaster / rescue or war environment, it is practically impossible for a user to keep an eye on the status of network recovery due to his or her own mission, so that data is delivered to the destination when the network is restored. Until this point, a constant delay may occur. However, the delay time can be fatal in view of the type and purpose of the application used in the environment.

In order to overcome such limitations of the conventional data transmission service, an opportunistic data transmission scheme has recently been devised.

2A and 2B illustrate a process of an opportunistic data transmission method according to an embodiment of the present invention.

In the opportunistic data transmission method according to an embodiment of the present invention, when data transmission is difficult at this time due to network disconnection (210), the user terminal temporarily stores the user's transmission data (214), and the network is reconnected in the future. Once automatically (250) attempts to retransmit the user data (262, 270, 274) to support the user data transmission to the destination node without explicit and persistent involvement of the user.

The opportunistic data transmission method minimizes the load of the user even in an environment such as a disaster / rescue and exhibition, where a user's network connection failure or network disconnection may occur frequently and a user cannot perform continuous data transmission as the user performs a special task. And the rapid delivery of data. In addition, the opportunistic data transmission method frequently fails to access the destination node through the backbone network of the user terminal due to the absence or destruction of the base communication facility, and the user's explicit and continuous involvement even if the time is variable. This ensures fast data transfer, improving efficiency of user tasks and minimizing user load.

However, even UEs using an opportunistic data transmission method may have user terminals that do not recover connectivity to the backbone network according to the current location and the surrounding communication environment. However, due to partial network disconnection, connectivity to the destination node may not be restored. Terminals that do not recover connectivity with the network or connectivity with the destination node, even if using the opportunistic data transmission method, it is difficult to transmit data to the destination node as a result. This is because only the user terminal recovering the connectivity to the destination node can succeed in data transmission.

In addition, until the terminal recovers the connectivity to the destination node, data transmission to the destination node is suspended, and thus a transmission delay occurs during this time. The transmission delay time is proportionally increased according to the connectivity recovery time between the user terminal and the destination node, and the increase in the delay time may be fatal due to the nature of the user task performed in the disaster / rescue and exhibition environment.

The above problem occurs because the user terminals operate independently of each other. However, a user terminal that does not recover connectivity to a backbone network may not always be isolated but may be connected to another user terminal through an ad hoc network using another communication interface. That is, there is a possibility that data can be delivered to the destination node through another user terminal that has the possibility of recovering the connectivity even if the user does not recover the connectivity to the destination node. In particular, in special circumstances, such as disaster / rescue and wartime, users form groups and perform ad hoc networks, thus creating ad hoc networks using near field communication technology.

Accordingly, the present invention not only solves the problems of the conventional data transmission method, but also provides a data transmission method and a system using the same which improves an opportunistic data transmission method that operates independently.

The present invention provides an ad hoc connection between terminals that have lost connectivity to a destination node in an environment in which a path disconnection between a terminal and a destination node occurs frequently due to a failure of a terminal network connection or network disconnection such as a disaster / rescue and exhibition environment. By sharing the transmission data for a specific destination node through networking, and the terminal that first recovered the connectivity to the destination node transfers all data on behalf of other shared terminals, the speed of data delivery and connectivity to the destination node To define a data sharing-based opportunistic data delivery method, a system and related messages for improving the transmission success rate of non-recoverable terminals.

According to an embodiment of the present invention, in a communication system, in a data transmission method for transmitting data using a neighbor terminal when a network is disconnected, first data to be transmitted is generated or is suspended from a neighbor terminal in the communication system. Checking whether a path is disconnected from a destination node to which the first or second data is to be transmitted when second data is received; If the path to the destination node is disconnected, at least one neighboring end existing in the communication system only if the existing terminal exists in the communication system withholding transmission of the first or second data and checking whether the neighboring terminal exists in the communication system. Broadcasting said pending transmission data to a horse and storing said first or second pending transmission data; A terminal connected to the destination node from among at least one neighboring terminal in the communication system that has received the broadcasted transmission pending data attempts to transmit the received pending transmission of the first or second data to the destination node, and If the transmission attempt is successful, a data transmission method including broadcasting the success status to at least one neighboring terminal existing in the communication system is proposed.

According to an embodiment of the present invention, in a communication system, in a data transmission system for transmitting data by using an adjacent terminal when a network is disconnected, receiving a first data transmission request and transferring the first data to a data transmission manager Application; When the first data is received from the application program or second data is received from the data sharing manager, whether to disconnect the path with the destination node to which the first or second data is to be transmitted is determined. The data for transmitting first or second data and conveying whether the transmission is successful or not to the data sharing manager, and in case of disconnection, suspend transmission of the first or second data and confirm whether an adjacent terminal exists in the communication system. Transmission manager; Transmitting the second data to the data transmission manager when receiving the second data pending transmission from the neighbor terminal in the communication system, and the at least one present only when there is at least one neighbor terminal in the communication system The data for broadcasting the first or second data pending transmission to a neighboring terminal of, and receiving the success or failure of transmission of the data from the data transmission manager and broadcasting it to at least one neighboring terminal of the communication system. A sharing manager; And the data storage for storing the first or second data pending transmission.

The data sharing-based opportunistic data transmission method proposed by the present invention loses connectivity to a destination node in a disaster / structure and exhibition environment in which a path disconnection with a destination node may frequently occur due to a network connection failure or network disconnection of a terminal. By sharing data between terminals, it is possible to improve the speed of data transmission and the success rate of transmission, thereby improving user convenience and efficiency of task execution.

In particular, communication in disaster / rescue and wartime environments is typically done by a group of users engaged in a specific mission and the user's request for transmission data reports the results of the mission's performance to remote command headquarters connected through the backbone network. In this regard, the speed of data transmission and the improvement of the transmission success rate, which are the effects of the present invention mentioned above, are most important.

In the following description of the present invention, if it is determined that detailed descriptions of related well-known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be based on the contents throughout this specification.

The detailed operation of the present invention will be described with reference to the drawings. For better understanding, we first describe the data sharing-based opportunistic data delivery system and the message, and then describe the data sharing-based opportunistic data delivery method.

3 is a block diagram of a data sharing based opportunistic data delivery system according to the present invention.

The data transfer system according to an embodiment of the present invention includes at least one of a conventional application 310 and an Opportunistic Data Transfer based Application Program (ODTAP) 315. The user requests data transmission through the conventional application 310 or the opportunistic data transmission based application 315.

The conventional application program does not support an opportunistic data transmission method, and immediately creates a socket and processes data transmission in response to a user's data transmission request. On the other hand, the opportunistic data transfer based application 315 supports an opportunistic data transfer method, and has an interface with an Opportunistic Data Transfer Manager (ODTM) 330 which will be described later. The transmission data and destination address / port information requested by the user are transmitted to the opportunistic data transmission manager 330, and the data transmission processing status and results are reported to the user.

The opportunistic data delivery system also includes the opportunistic data transfer manager 330, an opportunistic data buffer (ODB) 320, and a data sharing manager (DSM) 335. . Optionally, the system may include a network connection manager (CM) 340 and 345.

When the opportunistic data transfer manager 330 receives user request transmission data, the opportunistic data transfer manager 330 checks whether a path is disconnected from the destination node. Optionally, the opportunistic data transfer manager 330 obtains network connection state information of the user terminal from the network connection manager (CM) 340 and 345, and checks whether a path is disconnected between the terminal and the destination node to determine whether user request data is received. Determine whether to attempt transmission. If data transmission is not possible due to a network connection failure or path disconnection, the opportunistic data transfer manager 330 stores the data in the opportunistic data store 320 and sends the data to the data sharing manager 335. Initiate opportunistic data delivery initiatives based on data sharing by communicating information. In addition, the opportunistic data transmission manager 330 continuously observes whether the terminal reconnects to the network through interworking with the network connection managers 340 and 345, and when the terminal reconnects to the network and the connectivity with the destination node occurs. Immediately transmits pending transmission data stored in the opportunistic data archive 320.

Optionally, when retrying transmission of pending data fails because of repeated network connection failure of a terminal or path disconnection with a destination node, the opportunistic data transmission manager 330 retransmits pending transmission data using a timer. Exponentially increasing periods minimize system load. At this time, the management of this retransmission period is made through the setting / operation of the transmission hold timer.

The network connection manager (CM) includes an infrastructure connection manager (ICM) 340 and an ad-hoc network connection manager (ACM) 345. The backbone network connection manager 340 controls network connection of backbone network communication access devices and reports access and disconnection information to the opportunistic data transfer manager 330. The ad hoc network connection manager 345 controls the network access of the ad hoc network communication access devices and reports the join and leave information of the ad hoc network to the opportunistic data transfer manager 330 and the data sharing manager 335. .

The data sharing manager 335 is activated when the opportunistic data transmission manager 330 fails to attempt data transmission due to the failure of the terminal network access. The data sharing manager 335 checks the ad hoc network subscription of the terminal to the ad hoc network connection manager 345 and, if subscribed, generates and broadcasts a Data_Transfer_Request message 400 to the ad hoc network connection. Allow other terminals to share transmission pending data. On the other hand, when the terminal is not subscribed to the ad hoc network, the data sharing manager 335 stores the data in the opportunistic data storage 320.

When the user terminal receives the Data_Transfer_Request message 400 from other terminals subscribed to the ad hoc network, the user terminal receiving the message transfers the data to its opportunistic data transfer manager 330. Attempt to transmit the user data contained in the message to the destination node. When the transmission of the data is impossible, the opportunistic data transfer manager 330 stores the data in the opportunistic data storage 320, and when the data transmission is successful, the data sharing manager 335 By generating and transmitting a Data_Transfer_Release message 410 to other terminals subscribed to the ad hoc network, the redundant transmission of the data is prevented.

In addition, the data sharing manager 335 observes whether the terminal joins the ad hoc network through continuous interworking with the ad hoc network connection manager 345, and when the terminal accesses the ad hoc network, the opportunistic data storage 320. The data_Transfer_Request message 400 is generated and broadcasted for the data that is not shared with other terminals among the transmission pending data stored in FIG. 6) (see FIG. 7).

The opportunistic data store 320 temporarily stores the transmission pending data when a request is generated by the opportunistic data transfer manager 330 and the data sharing manager 335. The detailed format of the pending transmission data stored in the opportunistic data store 320 is described in FIG. 4C.

The data delivery system also optionally includes TCP / IP, UDP / IP sockets 350 and OS 360, backbone network communication interface 370, ad hoc network communication interface 375, and the like. Various components of the prior art can be applied to the component.

In one embodiment according to the present invention, the system may include both the conventional application 310 and the opportunistic data transmission based application 320 in processing the transmission request data of the user according to the user's environment. Can be. If the disconnection of the network connection or the path connection with the destination node does not occur as usual, even if the user requests a data transmission through the opportunistic data transmission based application, the data is processed by the data processing method of the conventional application. Transmitting also eliminates the minimal system load caused by unnecessary retransmission attempts. In addition, the system may transmit user request data through a data processing method of the opportunistic data transmission based application defined in the opportunistic data transmission system in an environment where frequent disconnection of a network connection is expected, such as a disaster / rescue or an exhibition. have. The opportunistic data transfer manager may determine whether it is in a normal or special environment by using statistics of a network connection short circuit detection result of the network connection manager.

4A to 4C are frame diagrams of messages used in a data sharing based opportunistic data delivery system.

The Data_Transfer_Request message 400 shown in FIG. 4A is a message for requesting data sharing and transmission to other terminals, and the Message_Type field is for distinguishing types of messages and has a size of 1 bit and a value of 0. . The Source_IP / Port_Number and Destination_IP / Port_Number fields indicate the source terminal address and port number, the destination address and the port number of the user request transmission data, and the Sequence_Number is used to distinguish when a plurality of transmission request data occur in a specific terminal. . And user data is attached.

The Data_Transfer_Release message 410 illustrated in FIG. 4B is an efficiency due to duplicate transmission of data by requesting cancellation of transmission of the data to other terminals holding the sharing request data when the transmission of sharing request data of another terminal is successful. It is used to prevent the reduction. The Data_Transfer_Release message 410 also has a 1-bit Message_Type field and its value is set to 1. User data is not attached separately.

The transmission hold data storage format 420 shown in FIG. 4C represents a form in which the transmission request data of the user is stored in the opportunistic data store 320. The Data_Sharing_Flag field is for identifying whether the corresponding data is shared with other terminals. The initial setting value is 0. When data is shared through broadcasting of the Data_Transfer_Request message 400, the Data_Sharing_Flag value is set to 1 and stored. . By doing so, when the terminal newly accesses the ad hoc network, the data sharing manager 335 may identify data to be attempted to share data among the data stored in the opportunistic data storage 320.

5, 6 and 7 are process flow diagrams illustrating the detailed operation of the data sharing based opportunistic data transmission method.

5 shows a processing process when a user requests data transmission.

As shown in FIG. 5, when a user's data transmission request occurs (500), the application program 315 transmits the user request transmission data and destination address / port information to the opportunistic data transmission manager 330 (510). .

The opportunistic data transmission manager 330 examines whether data is transmitted according to the opportunistic data transmission method, and if the data transmission is successful, transmits this information to the application, and the application transmits a data transmission success message. Output 524 and terminate the process.

When data transmission is not possible due to a terminal network connection failure or network disconnection of the terminal (520), the opportunistic data transfer manager 330 transfers the data to the data sharing manager 335 (522), and the data sharing. The manager 335 checks whether the terminal accesses the ad hoc network to the ad hoc network connection manager 345 (530).

If the terminal is not connected to the ad hoc network, since there is no object to share data, the data is stored in the opportunistic data storage 320 and the process ends (534). When the terminal accesses the ad hoc network, the data_Transfer_Request message 400 is generated in order to share the data pending transmission with other terminals (532), and the message is broadcasted to other terminals connected to the ad hoc network. Share the data pending transmission (540). The data is stored in the opportunistic data store 320 by setting the value of the Data_Sharing_Flag field to 1 (550 and 534). Thus, when any terminal belonging to the ad hoc network recovers connectivity with a destination node, the data stored in the opportunistic data repository 320 is transferred to the destination by the opportunistic data manager 330 of the restored terminal. Delivered. That is, the first user terminal recovering connectivity to the destination node can transmit all pending transmission user data shared between the groups.

6 shows a processing procedure when a terminal receives a data sharing request of another terminal through an ad hoc network.

As shown in FIG. 6, upon receiving the Data_Transfer_Request message 400 from other terminals, the data sharing manager 335 transfers the sharing request data to the opportunistic data transfer manager 330 according to the opportunistic data transmission method. Attempt to transmit data to the destination node (610).

If the data transmission is successful, the data sharing manager 335 generates a Data_Transfer_Release message 410 in order to prevent duplicate data transmission by other terminals sharing the data by receiving the Data_Transfer_Request message 400. In operation 626, the Data_Transfer_Release message is broadcasted through the ad hoc network in operation 640.

When the data transmission is not possible due to a period network access failure or network disconnection of the terminal (620), the data is transferred to the data sharing manager 335 again (622), and the data sharing manager 335 For the received sharing request data, the value of the Data_Sharing_Flag field is set to 1 (624), stored in the opportunistic data store 320, and the process ends (630).

The shared request data stored as described above is transferred to the destination node according to an opportunistic data transmission method when the terminal recovers connectivity with the destination node. If the transmission is successful, the redundant request data is prevented by using another Data_Transfer_Release message 410. The process proceeds (626, 640).

7 shows a process when the terminal newly accesses an ad hoc network.

As shown in FIG. 7, when the user terminal newly accesses the ad hoc network, the data sharing manager 335 queries the opportunistic data store 320 whether there is data that needs to be shared with other terminals (710). The existence of data that needs to be shared (ie, data that has not been broadcasted yet) is determined by examining the Data_Sharing_Flag field (720). Referring to FIG. 5, the data transmission is suspended but the data is not broadcasted because the ad hoc network is not configured, and the data_Sharing_Flag value will be in a state of 0, which is an initial setting value. If there is data whose data_Sharing_Flag is set to 0 (that is, transmission pending data not shared with other terminals), the data sharing manager 335 generates a Data_Transfer_Request message 400 for the data ( 722) Broadcast the message to other terminals of the ad hoc network (730) and set the value of Data_Sharing_Flag to 1 (732). The above process is repeatedly performed for all data that needs to be shared, and when there is no longer transmission pending data in which the value of Data_Sharing_Flag is set to 0, the process is terminated.

Optionally, the ad hoc network connection manager 345 informs whether the terminal newly accesses the ad hoc network. Optionally, the opportunistic data transmission manager 330 uses the transmission hold timer (not shown) to event the ad hoc network connection from the ad hoc network connection manager 345 whenever the predetermined delay time expires. You can also receive a report through.

Meanwhile, the present invention can operate independently regardless of the type of lower communication technology, and can be applied to all types of data transmission services except real-time multimedia data transmission services such as voice / video communication and video streaming services. Data transfer services include services that operate in a peer-to-peer fashion as well as application services such as e-mail and short message transfer services (SMS) based on a server-client model. .

Currently, user terminals such as mobile phones, laptops, and PDAs (Personal Digital Assistants) equipped with a communication interface capable of connecting to a backbone network and a communication interface supporting ad hoc network formation have been widely used, and thus the present invention can operate on various platforms. It is possible.

On the other hand, while the preferred embodiment of the present invention has been shown and described, the present invention is not limited to the specific embodiments described above, in the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

For example, in the above-described preferred embodiment of the present invention, an interworking technique based on TCP / IP and UDP / IP sockets is described in the background. However, the main network access communication technologies of the user terminal include wired communication technologies such as ADSL (Asymmetric Digital Subscriber Line), optical communication, and CDMA (Code Division Multiple Access), WiBro and It will be apparent that not only the wireless mobile communication technology but also the short-range wireless access technology such as wireless LAN and Bluetooth can be applied in the present invention. In addition, it will be apparent that wireless LAN, Bluetooth, and ZigBee technologies supporting ad hoc network formation may be used in the technology standard for ad hoc network formation between user terminals.

1 is a flow diagram of a user data transmission process according to the prior art in an environment where connection to a network is frequently disconnected;

2A is a process flow diagram of an opportunistic data transmission scheme in accordance with one embodiment of the present invention;

2B is a process flow diagram of an opportunistic data transmission method when a terminal is connected to a network according to an embodiment of the present invention;

3 is a block diagram of a data sharing based opportunistic data delivery system according to the present invention;

4A is a frame diagram of a data transfer request message used in a data sharing based opportunistic data delivery system;

4B is a frame diagram of a data transfer release message used in a data sharing based opportunistic data delivery system;

4C is a storage format configuration diagram of pending transmission data for use in a data sharing based opportunistic data delivery system;

5 is a process flow diagram when a user requests data transmission;

6 is a process flowchart when a terminal receives a data sharing request of another terminal through an ad hoc network;

7 is a process flowchart when a terminal newly accesses an ad hoc network.

Claims (6)

In a communication system, in a data transmission method for transmitting data using a neighbor terminal when the network is disconnected, Checking whether a path is disconnected from a destination node to which the first or second data is to be transmitted, when the first data to be transmitted is generated or second data that has been suspended for transmission is received from an adjacent terminal in the communication system; If the path to the destination node is disconnected, at least one neighboring terminal existing in the communication system only if the existing terminal exists in the communication system after the transmission of the first or second data is suspended and the existence of the neighboring terminal is confirmed. First broadcasting the pending transmission of data to the user, and storing the first or second pending transmission data; And A terminal connected to the destination node among at least one neighboring terminal in the communication system that has received the first broadcast transmission pending data attempts to transmit the received transmission pending first or second data to the destination node; And if the transmission attempt succeeds, performing a second broadcast on at least one neighboring terminal existing in the communication system, whether the success is successful. The storage format of the data pending transmission includes a field for a flag indicating whether broadcasting has been performed. The method of claim 1, Determining whether a new terminal accesses the communication system whenever a predetermined delay time expires by driving a transmission hold timer when the first broadcasting is not performed; And The method further includes the step of broadcasting the first or second data pending transmission is stored without broadcasting because the neighboring terminal does not exist in the communication system, when the new terminal accesses the communication system, And the delay time is exponentially increased. delete In a communication system, in a data transmission system for transmitting data using an adjacent terminal when the network is disconnected, An application program for receiving a first data transfer request and transferring the first data to a data transfer manager; When the first data is received from the application program or second data is received from the data sharing manager, whether to disconnect the path with the destination node to which the first or second data is to be transmitted is determined. The data for transmitting first or second data and conveying whether the transmission is successful or not to the data sharing manager, and in case of disconnection, suspend transmission of the first or second data and confirm whether an adjacent terminal exists in the communication system. Transmission manager; Transmitting the second data to the data transmission manager when receiving the second data pending transmission from the neighbor terminal in the communication system, and the at least one present only when there is at least one neighbor terminal in the communication system The data sharing for broadcasting the first or second data pending transmission to the neighboring terminal of, and receiving the success or failure of transmission of the data from the data transmission manager to broadcast to at least one neighboring terminal of the communication system Manager; And And a data repository for storing the first or second data pending transmission. The method of claim 4, wherein A network connection manager that checks whether a path is disconnected from the destination node; And When the predetermined delay time expires further includes an ad-hoc network connection manager for informing the data transmission manager whether a new neighbor terminal accesses the communication system, The data sharing manager broadcasts the transmission pending first or second data stored without being broadcast because no neighbor terminal exists in the communication system to the new neighbor terminal when the new neighbor terminal accesses the communication system. Casting and setting or operating a transmission hold timer to exponentially increase the constant delay time. The method according to claim 4 or 5, The storage format of the data stored in the data storage includes a field for a flag indicating whether or not broadcasting.

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