KR101007407B1 - Data transfer method and a terminal thereof in a network with intermittent connectivity - Google Patents

Abstract

PURPOSE: A data transmission method of a terminal in a frequent network cut environment and a terminal thereof are provided to embody an effective transmission of a user request data in a disaster/rescue or war environment, thereby reducing the load of the user. CONSTITUTION: An application program transfers a transmission data and a destination address/port information to an ODTM(Opportunistic Data transfer Manager)(302). If a terminal is connected to a net, the ODTM confirms a connection state between the terminal and a destination node(310,312). If a path between the terminal and a destination is not cut, the ODTM transfers the transmission data to the destination(320,322). The ODM outputs data transmission success message or information to a user or an application program(330,332).

Description

Data transmission method of a terminal in a frequent network disconnection environment and the terminal {DATA TRANSFER METHOD AND A TERMINAL THEREOF IN A NETWORK WITH INTERMITTENT CONNECTIVITY}

The present invention relates to a method and a terminal for transmitting user data in an environment in which connectivity to a destination node of a user terminal is not always maintained and is frequently disconnected. In particular, the present invention provides a method for continuously monitoring a user's network connection status or retransmitting data. A method for guaranteeing data transmission of a user and a terminal 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.

The service itself is not provided unless the user terminal is connected to a server or other terminal that provides the service through a communication network. Therefore, even if the user requests data transmission (100), the user terminal outputs an error message informing of disconnection with the network (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 information about the service quickly from the service provider, so that the user's inconvenience or disconnection of the network connection is not significant even in a conventional data transmission service method and an environment in which the terminal is used.

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 an exhibition environment, the user may frequently experience network connection failure or network disconnection of the terminal because the infrastructure such as the base station and the relay station may be frequently moved or temporarily installed. 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 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 terminal for supporting the same, rather than a method of recognizing a network connection state or a network connection state and attempting to retransmit data, such as 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 the prior art, explicit and continuous involvement of the user is required for successful transmission of user data when the network is recovered after disconnection. However, in a disaster / rescue or war environment, it is unreasonable to assume that explicit user involvement is possible due to the nature of the environment and mission. In addition, the data transmission services used in the above environment need rapid data transfer, but the user cannot continuously monitor the recovery state of the network or attempt to retransmit the data, resulting in a large number of delays.

Therefore, in the environment where the disconnection with the destination node of the user terminal is variable and frequently occurs due to the network connection failure or network disconnection of the terminal, such as a disaster / rescue or exhibition environment, the present invention fails after an initial attempt of data transmission by the user. By monitoring network connection status and delivering data quickly after network connection without explicit and continuous involvement of the user, we provide an opportunistic data delivery method and new terminal for minimizing user load and ensuring the rapid delivery of data. do.

According to an embodiment of the present invention, a method for transmitting data by a terminal in a communication system, the method comprising: determining whether the terminal is connected to a network when a data transmission is requested from a user; If it is determined that the terminal is connected to the network, checking whether the path to the destination node is disconnected using the address of the destination node to receive the data requested for transmission; If it is checked that the path to the destination node is not disconnected, transmitting the data to the destination node; If it is determined that the terminal is not connected to the network or the path to the destination node is disconnected, starting the timer after the transmission of the data is suspended and storing the data for which the transmission is suspended; And when the terminal connected to the network or the timer driven when the transmission is suspended ends, attempting to retransmit the stored transmission pending data to the destination node.

According to an embodiment of the present invention, in a terminal supporting data transmission in a communication system, when data transmission is requested from a user, the requested data and an address of a destination node to receive the data are transmitted to a data transmission manager. Application to; A network connection manager that checks a network connection state by a connection state between the terminal and the network; The data transmission manager for transmitting the data to a destination node when the requested data and the address of a destination node to receive the data are transmitted from the application program; And a data storage for storing data pending transmission by the data transmission manager, wherein the data transmission manager confirms a network connection state through the network connection manager, and determines the terminal by the confirmed network connection state. If it is determined that it is connected to the network, it is checked whether the path to the destination node is disconnected using the address of the destination node. If the path to the destination node is not disconnected, the data is transmitted to the destination node. If it is determined that the terminal is not connected to the network or is determined that the path to the destination node is disconnected, the terminal suspends the transmission of the data and then starts a timer and stores the suspended data in the data storage. Suggest.

The opportunistic data transmission method proposed in the present invention is a method for transmitting user request data without explicit involvement of a user in a disaster / structure or 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 reducing the user's load by enabling efficient transmission success, it is possible to deliver data within the minimum delay time when the terminal reconnects or recovers from the network. Make sure In addition, the opportunistic data transmission support terminal presented in the present invention can provide the above-mentioned effects in the form of the most efficient and lightly loaded on the system.

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 present invention can be applied independently to all kinds of existing communication technologies, and can be applied to all kinds of applications having no real time.

The detailed description of the opportunistic data transmission method of the present invention and a terminal for the same will be described with reference to the drawings. The opportunistic data transmission terminal will be described first for clarity and then the opportunistic data transmission method will be described.

2 is a block diagram of an opportunistic data transmission terminal according to the present invention.

The present invention temporarily stores user data when a terminal is disconnected from a terminal and a destination node due to a network connection failure or network disconnection of the terminal, and immediately transmits the user data when the terminal is connected to a destination node. We define an opportunistic data transfer method to minimize and a new terminal for it.

The terminal for transmitting data according to an embodiment of the present invention includes at least one of a conventional application program 210 and an opportunistic data transfer based application program (ODTAP) 220. The user requests data transmission through the conventional application 210 or the opportunistic data transmission based application 220.

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 220 supports an opportunistic data transfer method, and has an interface with an Opportunistic Data Transfer Manager (ODTM) 240 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 240, and the data transmission processing status and results are reported to the user.

Also, the terminal for transmitting the data includes the opportunistic data transmission manager 240, a network connection manager (CM) 250, and an opportunistic data buffer (ODB) 230.

When the opportunistic data transmission manager 240 receives user request transmission data from the application program 220, the opportunistic data transmission manager 240 obtains network connection state information of the terminal from the network connection manager 250, and receives a ping program. By checking whether the terminal is disconnected between the destination node and the destination node, it is determined whether the user request data is to be retransmitted. In addition, when the user request data cannot be transmitted due to a network connection failure of the terminal or a path disconnection with the destination node, the opportunistic data transmission manager 240 transmits the user transmission request data to the opportunistic data storage 230. Storing and observing whether the terminal reconnects to the network through continuous interworking with the network connection manager 250, and immediately when the terminal reconnects to the network and the path disconnection with the destination node is resolved, the opportunistic data store immediately. Attempt to retransmit the transmission pending data stored at 230.

Optionally, when retrying transmission of pending data fails because of repeated network connection failure or disconnection with a destination node, the opportunistic data transmission manager 240 retransmits pending transmission data using a timer. Exponentially increasing periods minimize system load. At this time, the management of such a retransmission period is performed through the setting / operation of the transmission hold timer.

The opportunistic data archive 230 temporarily stores the transmission pending data when a request from the opportunistic data transmission manager 240 occurs, and optionally, the transmission pending data is tagged with address / port information of a destination node. Can be stored using.

The network connection manager 250 controls network connection of various communication devices of the terminal, and reports network connection and disconnection information to the opportunistic data transmission manager 240.

Optionally, the terminal for transmitting the data also includes TCP / IP, UDP / IP socket 260, OS 270, and communication device 280, which may include various techniques of the prior art. Applicable

In an embodiment of the present disclosure, the terminal may include both the conventional application 210 and the opportunistic data transmission-based application 220 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 terminal transmits user request data through a data processing method of the opportunistic data transmission based application defined by the opportunistic data transmission supporting terminal in an environment where frequent disconnection of a network connection is expected, such as a disaster / rescue or exhibition. Can be. 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.

Hereinafter, an opportunistic data transmission method according to the present invention will be described in detail with reference to the process flowcharts of FIGS. 3 to 6.

3 shows a process flow when a user requests a data transfer via an opportunistic data transfer based application 220.

As shown in FIG. 3, when a user's data transmission request is generated (300), the application program transmits the user request transmission data and destination address / port information to the opportunistic data transmission manager 240 (302).

Thereafter, the opportunistic data transfer manager 240 queries the network connection manager 250 whether the terminal is connected to the network (304), when the terminal is connected to the network (310), a ping program, or the like. Check whether the path is disconnected between the terminal and the destination node by using (312). If the terminal is not connected to the network (310), the opportunistic data transmission manager 240 outputs / transfers (314) a message or information indicating to suspend data transmission to the user or the application (220). In the cautionary data storage 230 stores the data pending transmission (316). Even when the terminal is connected to the network but the path to the destination node is disconnected due to the network disconnection (320), the data transmission pending message or information is output / transmitted in the same manner (314), and the opportunistic data is transmitted. Store in storage 230 (316), the process ends.

On the other hand, if the terminal is connected to the network (310) and the path between the terminal and the destination is not disconnected (320), the opportunistic data transfer manager creates a socket to deliver the user request transmission data to the destination (322), If the data transmission is successful (330), the data transmission success message or information is output or transmitted to the user or the application 220 (332).

In addition, when data transmission fails due to a stop of an application program of a destination node, regardless of the terminal and network connection state (330), the opportunistic data transmission manager generates a data transmission failure message based on the user or the opportunistic data transmission. Output / deliver (334) to application 220 and terminate process.

4 shows a process flow when the connection between the terminal and the network is restored.

As shown in FIG. 4, when the terminal is reconnected to the network, the network connection manager 250 notifies the opportunistic data transmission manager 240 through the occurrence of an event 400. Optionally, the reconnection to the network of the terminal may be attempted by a user or periodically by the network connection manager.

Meanwhile, the opportunistic data transfer manager 240 queries the opportunistic data vault 230 for the existence of transmission pending data when the event occurs (402). If the transmission pending data exists as a result of the query (410), the opportunistic data transmission manager 240 checks whether the path is disconnected between the terminal and the destination node using a ping program or the like ( In contrast, if the transmission pending data does not exist, the process ends (440).

As a result of the path disconnection check 412, when the path between the terminal and the destination is not disconnected (420), the opportunistic data transmission manager 240 creates a socket and transmits user request transmission data to the destination ( 422) If the data transfer is successful (430), the corresponding pending data is deleted from the opportunistic data archive 230 (432), and a data transfer success message or information is sent to the user or the application 220. Output / deliver to 434. Then, the method returns to step 402 to query the opportunistic data store 230 if there is transfer pending data to transmit another transfer pending data.

In addition, when the terminal is connected to the network but the path to the destination node is disconnected due to network disconnection (420), the opportunistic data transmission manager 240 suspends the transmission to retry the data transmission after a certain waiting time. A timer is activated and the transmission hold data is stored in the opportunistic data archive 230 (424). At this time, the operating time of the timer is set to increase exponentially with respect to the previous operating time to minimize the load on the system.

In addition, when the transmission of the data fails due to reasons such as the destination node (430), the opportunistic data transmission manager 240 sends a data transmission failure message to the user or the application program, as described in FIG. Output / deliver (436) to 220 and terminate the process.

5 shows a process flow when the connection with the network of the terminal is lost.

As shown in FIG. 5, when the terminal is disconnected from the network, the network connection manager 250 notifies the opportunistic data transmission manager 240 through the occurrence of an event (500). When the opportunistic data transmission manager receives the network connection disconnection information of the terminal, the opportunistic data transmission manager first checks whether there is data currently being transmitted (502).

If there is data being transmitted, the opportunistic data transfer manager 240 stops the transmission of the data (512), stores the suspended data in the opportunistic data store 230 (514), and The storing process of the data which has been stopped is repeated until the transmission is stopped for all data being transmitted (510, 512, 514).

On the other hand, if there is no data being transmitted or the transmission of all data is stopped (510), the opportunistic data transfer manager stops all current pending transmission pending timers (516) and terminates the process.

6 details the process flow when the transfer pending timer of specific transfer pending data expires.

As described above, the opportunistic data transmission manager 240 manages a timer for each transmission pending data, and when the timer for the specific transmission pending data ends (600), a path between the terminal and the destination node using a ping program or the like. It is checked whether is disconnected (602). The reason why the terminal does not need to confirm whether the network is connected in advance is that the process of determining whether the path is disconnected is operated only when the terminal is connected to the network (see steps 400 and 412 of FIG. 4).

As a result of the path disconnection check 602, when the path between the terminal and the destination node is not disconnected (610), the opportunistic data transfer manager 240 creates a socket and delivers user request transmission data to the destination. (612). If the transmission of the data is successful (620), the opportunistic data transfer manager 240 deletes the successful transmission of the data of the opportunistic data repository 230 (622), and the user receives a data transmission success message or information. Or output / deliver 624 to the application 220 and terminate the process.

As a result of checking whether the path is disconnected (602), in case of disconnection (610), the transmission hold timer is restarted to retry data transmission after a predetermined waiting time and the transmission hold data is stored in the opportunistic data store 230. (614). At this time, the operation time of the timer is set to increase exponentially with respect to the previous operation time as in the process of FIG. 4 to minimize the load on the system.

In addition, when transmission of the data fails due to reasons such as a destination node (620), the opportunistic data transmission manager 240, as described with reference to Figs. Output / deliver 626 to the application 220 and terminate the process.

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, the present invention can operate independently regardless of the type of subordinate 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. Can be.

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;

2 is a block diagram of an opportunistic data transmission terminal according to the present invention;

3 is a process flow diagram when a user requests data transmission through an opportunistic data transmission based application;

4 is a process flow diagram when the connection between the terminal and the network is restored;

5 is a process flowchart when the connection with the network of the terminal is lost;

Fig. 6 is a process flow diagram when the transfer hold timer of specific transfer hold data has expired.

Claims (4)

In a method for transmitting data by a terminal in a communication system, Determining whether the terminal is connected to a network when data transmission is requested from a user; If it is determined that the terminal is connected to the network, checking whether the path to the destination node is disconnected using the address of the destination node to receive the data requested for transmission; If it is checked that the path to the destination node is not disconnected, transmitting the data to the destination node; If it is determined that the terminal is not connected to the network or the path to the destination node is disconnected, starting the timer after the transmission of the data is suspended and storing the data for which the transmission is suspended; And When the terminal is connected to the network or the timer driven when the transmission is suspended ends, attempting to retransmit the stored transmission pending data to the destination node; Attempting the retransmission, Detecting whether the terminal is reconnected to the network or the timer driven when the transmission is suspended is terminated; Checking whether the path to the destination node is disconnected when the terminal is connected to the network or when the termination of the timer driven when the transmission is suspended is detected; If it is checked that the path with the destination node has not been broken, sending the data to the destination node; And If it is checked that the path with the destination node is disconnected, restarting the timer; Wherein the driving time of the timer increases exponentially in response to the number of restarts. delete In a terminal supporting data transmission in a communication system, An application program for transmitting the requested data and an address of a destination node to receive the data to a data transmission manager when data transmission is requested from a user; A network connection manager that checks a network connection state by a connection state between the terminal and the network; The data transmission manager for transmitting the data to a destination node when the requested data and the address of a destination node to receive the data are transmitted from the application program; And A data storage for storing data pending transmission by the data transmission manager; The data transfer manager, The network connection state is checked through the network connection manager, and if it is determined that the terminal is connected to the network based on the checked network connection state, it is checked whether the path to the destination node is disconnected using the address of the destination node. , If it is determined that the path with the destination node is not disconnected, the data is transmitted to the destination node, and if it is determined that the terminal is not connected to the network or if it is determined that the path with the destination node is disconnected, transmission of the data is performed. And a terminal for driving a timer after the suspension and storing the pending data in the data storage. The method of claim 3, wherein the data transfer manager, Detects whether the terminal is connected to the network again or the timer started when the transmission is suspended, and when the terminal is connected to the network or when the termination of the timer driven when the transmission is suspended, the path to the destination node is detected. Checks for disconnection, If the path with the destination node is not disconnected, the data is transmitted to the destination node. If the path with the destination node is checked that the path is disconnected, the timer is restarted. Here, the driving time of the timer increases exponentially in response to the number of restarts.

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