JP2005176047A - Data sharing communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide data sharing communication method between two or more terminal devices for restricting useless consumption of electric power or communication resource and ensuring common ground of data. <P>SOLUTION: A terminal 0 transmits a data sharing network structuring signal to a terminal 1 (step S101). The terminal 1 receives the data sharing network structuring signal from the terminal 0 and transmits the data sharing network participation signal to the terminal 0 (step S102). The terminal 0 receives the data sharing network structuring signal from the terminal 1, and transmits notification for receiving the data sharing network structuring signal to the terminal 1. Then, the terminal 0 and the terminal 1 transmit and receive index data mutually, and the terminal 0 and the terminal 1 request necessary data mutually and transmit and receive the mutually requested data. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a data sharing communication method for ensuring the commonality of data stored in a plurality of portable terminal devices that perform wireless communication in various operations in an organization such as a company or a public office. It is.

  In organizations such as companies and government offices, multiple terminal devices such as portable personal computers and PDAs (Personal Data Assistants) are used, and each terminal device receives data from other terminal devices via a wireless network. There are many cases of copying and using. In such a case, the copied data is updated and released without the knowledge of the user of the terminal device, and therefore the data of the terminal device may be outdated. In order to eliminate such a state, it is necessary to replace the data in the terminal device with a new one. In order to update the data to the latest state, data is transmitted and received between a transmitting terminal that transmits new data and a receiving terminal that receives the data and updates the data. It was necessary to send data information including information about the version of the data and the data. In addition, the receiving terminal needs to receive data information and data. For this reason, for example, when the data transmitted by the transmitting terminal is the same as the data of the receiving terminal, the transmitted data is unnecessary, so the power required for data transmission of the transmitting terminal and the data reception of the receiving terminal The power required for the transmission is wastefully used, and communication resources between the transmitting terminal and the receiving terminal are unnecessarily occupied. In the portable terminal device, it is necessary to save power and communication resources as much as possible, which is a problem.

As a conventional data sharing communication method, a method described in Patent Document 1 is known.
JP 2000-299698 A

  The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to share data among a plurality of terminal devices in order to suppress unnecessary use of power and communication resources and to ensure data commonality. It is to provide a method.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The invention of claim 1 is that a plurality of terminal devices including a first terminal device and a second terminal device transmit and receive data by wireless communication. In the communication method to be performed, the first terminal device transmits a data exchange start request to another unspecified terminal device, and the second terminal device transmits the data transmitted by the first terminal device. The exchange start request is transmitted to the first terminal device, and the first terminal device receives the data exchange participation request transmitted by the second terminal device, The first terminal device transmits index data including update information relating to data stored in the first terminal device to the second terminal device, and the second terminal device transmits the second terminal device. The first terminal device Index data is received, the second terminal device transmits the second terminal device index data to the first terminal device, and the first terminal device transmits the second terminal device. 2 receives the index data of the second terminal device, transmits the identification information of the data desired by the first terminal device to the second terminal device, and the second terminal device transmits the first terminal device. The identification information of the data desired by the first terminal apparatus is received, the identification information of the data desired by the second terminal apparatus is transmitted to the first terminal apparatus, and the first terminal apparatus Receiving the identification information of the desired data of the second terminal device transmitted by the second terminal device, transmitting the desired data of the second terminal device to the second terminal device, and The terminal device is the first terminal device The transmitted data desired by the second terminal device is received, the data desired by the first terminal device is transmitted to the first terminal device, and the first terminal device is the second terminal device. The data sharing communication method is characterized in that the data desired by the first terminal device transmitted by is received.

  Invention of Claim 2 is the data sharing communication method of Claim 1, Comprising: The said 1st terminal device is not transmitting the electromagnetic wave other than the data exchange start request | requirement of the other terminal device In this case, the data exchange start request is transmitted.

  A third aspect of the present invention is the data sharing communication method according to any one of the first to second aspects, wherein the first terminal device performs other processing before transmitting the data exchange start request. If the terminal device is transmitting a radio wave other than a data exchange start request, the transmission / reception function is stopped for a predetermined transmission standby time, and another terminal device exchanges data again after the transmission standby time elapses. It is characterized by repeatedly checking whether or not radio waves other than the start request are transmitted.

  The invention according to claim 4 is the data sharing communication method according to any one of claims 1 to 3, wherein the first terminal device waits for a predetermined participation after transmitting the data exchange start request. The reception state is continued for a time, and when the data exchange participation request is not received, the data exchange start request is transmitted again.

  The invention according to claim 5 is the data sharing communication method according to claim 4, wherein the first terminal device has a predetermined environment improvement waiting time and a transmission / reception function after the predetermined participation waiting time elapses. It is characterized by stopping.

  A sixth aspect of the present invention is the data sharing communication method according to the first aspect, wherein the first terminal device is in a reception state for a predetermined reception duration with a predetermined reception interval time. And transmitting the data exchange start request including information on timing at which the terminal 1 performs reception at a predetermined transmission time interval.

  A seventh aspect of the present invention is the data sharing communication method according to the sixth aspect, wherein the first terminal device stops a transmission / reception function during the reception interval time while transmission / reception is not performed. It is characterized by.

  The invention according to claim 8 is the data sharing communication method according to any one of claims 6 to 7, wherein the second terminal device transmits the timing transmitted by the first terminal device. The timing of the reception process of the first terminal device is detected from the information, and the data exchange participation request is transmitted.

  The invention according to claim 9 is the data sharing communication method according to any one of claims 1 to 8, wherein the first terminal device is identification information of data desired by the first terminal device. Is 0, and the identification information of the data desired by the second terminal device is 0, the predetermined environment change waiting time and the transmission / reception function are stopped, and after the environment change waiting time has elapsed, A data exchange start request is transmitted.

  A tenth aspect of the present invention is the data sharing communication method according to any one of the first to ninth aspects, wherein the first terminal device receives data desired by the first terminal device. The data exchange start request is transmitted later.

  The invention according to claim 11 is the data sharing communication method according to any one of claims 1 to 10, wherein the first terminal device receives data desired by the first terminal device. The transmission / reception function is stopped after a predetermined processing resumption waiting time.

  The invention according to claim 12 is a communication system in which a plurality of terminal devices including a first terminal device and a second terminal device transmit and receive data by wireless communication. A process of transmitting a data exchange start request to the unspecified terminal apparatus, a process of receiving radio waves from the other unspecified terminal apparatus, and a data exchange participation request from the second terminal apparatus Alternatively, a process of receiving a data exchange start request, a process of transmitting index data including update information relating to data stored therein, to the second terminal apparatus, and the second terminal apparatus transmitted by the second terminal apparatus A process of receiving index data of the terminal device, a process of transmitting identification information of the desired data out of the index data to the second terminal device, and a transmission of the second terminal device A process of receiving identification information of data desired by the second terminal apparatus, a process of transmitting data desired by the second terminal apparatus to the second terminal apparatus, and the second terminal apparatus This is a program for executing the process of receiving the desired data of the transmitted first terminal device.

According to the invention of Claim 1 and Claim 12, there exists an effect which can ensure the commonality of data among several terminal devices. Further, since it is not always necessary to transmit and receive the data itself every time index data is transmitted and received by the terminal device, there is an effect of suppressing occupation of communication resources. Furthermore, since the terminal devices confirm and exchange data that need to be updated with each other, there is an effect of reducing the risk that the data will be left without being updated.
According to the invention of claim 2, an effect of suppressing an increase in traffic and occurrence of collision in the communication processing can be obtained.

Moreover, according to the invention of Claim 4, Claim 5, Claim 6, and Claim 8, the effect which can start a communication process with a terminal device more reliably is acquired.
Moreover, according to the invention of Claim 3 and Claim 7, the effect which suppresses power consumption is acquired.
Further, according to the inventions of claim 9 and claim 11, it is possible to suppress the data exchange between the same two terminal devices from being performed twice or more, and to reduce power, communication resources, processing time, The effect which suppresses is acquired.
According to the invention of claim 10, there is an effect of reducing a risk that data is left without being updated.

  First, the basic concept of the present embodiment will be described. As shown in FIG. 2, the present embodiment includes a plurality of terminal devices that transmit and receive data by wireless communication with each other. Each terminal device stores therein data and index data (FIG. 3) representing an outline of the data. Each terminal device receives data and index data from other terminal devices, and copies and uses them. For this reason, when data and index data are updated, the new and old data are in different states for each terminal. Therefore, in order for the terminal 0 to obtain the latest data, first, a data sharing network construction signal (data exchange start request) for requesting the start of communication processing between terminal devices is sent to an unspecified terminal device. ,Send. The terminal 1 receives this, transmits a response, and starts communication processing between the terminal 0 and the terminal 1. Thereafter, the terminal 0 and the terminal 1 mutually transmit and receive index data. The terminal 0 examines the index data received from the terminal 1, and requests data from the terminal 1 when it finds newer data than the data stored in the terminal 0. Similarly, the terminal 1 examines the index data received from the terminal 0, and requests data from the terminal 0 when it finds newer data than the data stored in the terminal 1. Then exchange data with each other. In this way, by exchanging data between terminal devices, each other's data is updated to newer data.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 4 is a block diagram showing the configuration of the terminal device. The central processing unit 001 is a control unit that controls the terminal device, and details will be described later.
The radio unit 003 has a radio wave transmission / reception function, receives radio waves from other terminal devices, converts the received radio waves into radio data signals, and outputs them to the radio signal processing unit 002. The radio unit 003 receives the radio signal output from the radio signal processing unit 002, converts the radio signal into a radio wave, and transmits the converted radio wave to another terminal device. Further, when the wireless unit 003 inputs a power down signal from the wireless signal processing unit 002, the wireless unit 003 reduces the power consumption of the wireless unit 003 by stopping the radio wave transmission / reception process.
The wireless signal processing unit 002 is a communication control function that manages the state of the wireless unit 003. The wireless signal processing unit 002 converts the data input from the central processing unit 001 into a wireless data signal that can be processed by the wireless unit 003 and outputs the wireless data signal to the wireless unit 003. The radio signal processing unit 002 converts the radio data signal input from the radio unit 003 into data that can be processed by the central processing unit 001 and outputs the data to the central processing unit 001. The wireless signal processing unit 002 also reads data from the storage unit 005 and writes data. Further, a power down signal is output to the wireless unit 003 in order to suppress power consumption.

The storage unit 004 is a storage area for storing user data. The storage unit 004 is a positive real number, and stores Tent, Tcs, Tda1, Tda2, Tda3, Tda4, Tr, Trc, and Ts representing the length of time in advance. .
The operation unit 006 is a keyboard for inputting a request from the user, and the display unit 007 is a display for displaying data and the like to the user.
A storage unit 005 is a storage area for storing index data. The index data has the format shown in FIG. 3, and includes a data number (Data base No, identification information of desired data) for identifying individual data, a data attribute indicating the source and type of data, and a data generation time. Data update time, data length, and data attached information including other information. The index data needs to be updated in response to the data update.
In FIG. 2, terminals 0 to 4 are portable computers and have the functions of the terminal device of FIG.

  Next, the operation of the data sharing communication method in this embodiment will be described with reference to the drawings. FIG. 2 shows the present embodiment between a plurality of terminals. As an example, the communication start processing between the terminal 0 and the terminal 1, the mutual index data exchange processing, and the respective desired ones. A desired data information exchange process for communicating data and a data exchange process for transmitting and receiving actual data to each other will be described. FIG. 5 shows a state transition of the terminal 0.

<Communication start processing>
FIG. 1 shows the flow of the communication start process along the flow of time.
First, in the terminal 0, the central processing unit 001 outputs “carrier sense start” to the radio signal processing unit 002 in order to check the presence / absence of another terminal that is performing transmission / reception (state 0 in FIG. 5). The radio signal processing unit 002 inputs “carrier sense start” from the central processing unit 001, reads Tcs indicating time for checking the transmission of radio waves by other terminal devices from the storage unit 004, and transmits the radio waves to the radio unit 003 Tcs. The request to be received is output during The wireless unit 003 receives this request from the wireless signal processing unit 002 and receives radio waves.

  Next, when the wireless unit 003 does not receive a radio signal from another terminal during this Tcs, the wireless unit 003 notifies the wireless signal processing unit 002 of “no reception”. The wireless signal processing unit 002 inputs “no reception” from the wireless unit 003, determines that wireless radio waves can be transmitted and received, and receives a data sharing network construction signal for recruiting other terminal devices to exchange data with. The transmission request is output to the wireless unit 003. In response to this, the wireless unit 003 transmits a data sharing network construction signal (step S101 in FIG. 1, state 1 in FIG. 5). This signal is intended for an unspecified terminal device. Next, the wireless unit 003 notifies the wireless signal processing unit 002 of the end of transmission, and the wireless signal processing unit 002 inputs a notification of transmission end from the wireless unit 003. Here, the wireless signal processing unit 002 waits for a reply from another terminal device for a while. Therefore, the wireless signal processing unit 002 reads Tent (participation waiting time) indicating the length of the reception time from the storage unit 004 via the central processing unit 001, and requests the wireless unit 003 to receive radio waves during Tent. Is output. The wireless unit 003 receives a reception request from the wireless signal processing unit 002 and receives radio waves. (State 2 in FIG. 5).

  Alternatively, when the wireless unit 003 receives a radio wave transmitted by another terminal during this Tcs, the wireless unit 003 outputs “Received” to the wireless signal processing unit 002. The wireless signal processing unit 002 receives “Received” from the wireless unit 003 and detects that another terminal device is transmitting and receiving radio signals. Here, the radio signal processing unit 002 determines that it is better to wait for a while because the radio signal transmission / reception may continue even if the radio signal is immediately received from another terminal again. To do. Therefore, the wireless signal processing unit 002 outputs a power down signal to the wireless unit 003 to save power consumption. The wireless unit 003 receives the power down signal from the wireless signal processing unit 002 and performs power down (state 8 in FIG. 5). Next, the wireless signal processing unit 002 reads Tda1 (transmission standby time) representing the standby time from the storage unit 004 via the central processing unit 001, and after the elapse of Tda1, makes a radio wave reception request to the wireless unit 003. Output. The wireless unit 003 receives a request from the wireless signal processing unit 002 and performs reception (state 0 in FIG. 5). The wireless signal processing unit 002 and the wireless unit 003 repeat this reception and standby with power-down until it is determined that other terminals are not performing transmission / reception processing.

  At this time, if the wireless unit 003 does not receive a radio signal from another terminal during Tent, the wireless unit 003 notifies the wireless signal processing unit 002 of “no reception”. The wireless signal processing unit 002 receives “no reception” from the wireless unit 003 and detects that a communicable terminal device cannot be detected. Here, the wireless signal processing unit 002 determines that it is better to wait for a while because it may not be found even if it tries to detect another terminal that can immediately communicate again. For this reason, the wireless signal processing unit 002 outputs a power down signal to the wireless unit 003 to save power consumption. The wireless unit 003 inputs the power down signal from the wireless signal processing unit 002 and performs power down (state 9 in FIG. 5). Next, the wireless signal processing unit 002 reads Tda2 (environment improvement waiting time) indicating the standby time from the storage unit 004 via the central processing unit 001, and after the elapse of Tda2, the wireless signal processing unit 002 In order to redo the start processing again, “re-execute” is output to the central processing unit 001, and the central processing unit 001 receives this and restarts the communication start processing from the beginning (state 0 in FIG. 5).

Next, the wireless signal processing unit 002 of the terminal 1 receives the data sharing network construction signal from the terminal 0 via the wireless unit 003 and passes through the wireless unit 003 to apply for recruitment of data exchange partners from the terminal 0. Then, a data sharing network participation signal is transmitted to the terminal 0 (step S102 in FIG. 1).
The radio signal processing unit 002 of the terminal 0 receives the data sharing network participation signal from the terminal 1 via the radio unit 003, and ACKs to the terminal 1 via the radio unit 003 to confirm that the signal has been received. (ACKnowledgement) is transmitted. The radio signal processing unit 002 of the terminal 1 receives ACK from the terminal 0 via the radio unit 003 and outputs it to the central processing unit 001. Thereby, the start processing of communication between the terminal 0 and the terminal 1 is completed (state 3 in FIG. 5).

<Index data exchange processing>
FIG. 6 shows the flow of index data exchange processing along the flow of time (state 4 in FIG. 5). Subsequent to the communication start processing, the central processing unit 001 of the terminal 0 outputs an index data transmission request to the wireless signal processing unit 002, and the wireless signal processing unit 002 receives the data and reads the index data from the storage unit 005. It transmits to the terminal 1 via the wireless unit 003 (step S601 in FIG. 6).
The wireless signal processing unit 002 of the terminal 1 receives the index data from the terminal 0 via the wireless unit 003 and writes the index data in the storage unit 005 separately from the index data stored in the storage unit 005 of the terminal 1. The central processing unit 001 is notified of the completion of index data reception.

Next, the central processing unit 001 of the terminal 1 inputs a notification of reception of index data from the wireless signal processing unit 002 and outputs a reply request for index data to the wireless signal processing unit 002. The wireless signal processing unit 002 receives an index data return request from the central processing unit 001, reads out the index data originally stored in the storage unit 005 by the terminal 1, and the index data and the data from the terminal 0 are received. An ACK indicating that the signal has been normally received is transmitted to the terminal 0 via the wireless unit 003 (step S602 in FIG. 6).
Next, the radio signal processing unit 002 of terminal 0 receives the index data and ACK from terminal 1 via radio unit 003, and the index data stored in the storage area of terminal 0 is the original. The index data received separately is written in the storage unit 005. Next, the wireless signal processing unit 002 transmits an ACK indicating that the data from the terminal 1 has been successfully received to the terminal 1 via the wireless unit 003 (step S603 in FIG. 6), and completes reception of the index data. Notify the central processing unit 001.
Next, the wireless signal processing unit 002 of the terminal 1 receives the ACK from the terminal 0 via the wireless unit 003 and notifies the central processing unit 001 of the completion of index data reception.
This completes the index data exchange process.

<Preferred data information exchange process>
The central processing unit 001 of the terminal 0 analyzes the index data received earlier, and determines whether or not the actual data is necessary based on the data attribute, the data update time, or the data accompanying information. For example, when it is found that the data already stored in the terminal 0 and the data updated in the terminal 1 from the data update time of the index data is stored, this data becomes necessary data. Alternatively, if the data accompanying information indicates that data has been newly added, for example, sales data for 2004 is newly created in addition to sales data for 2003 stored in the terminal 0 until now. If it is found that the data is stored in the terminal 1, sales data for the fiscal year 2004 is also necessary data. Then, the central processing unit 001 writes the data number of necessary data in the storage unit 005. The terminal 1 performs the same process.

Next, the terminal 0 and the terminal 1 prepare for data exchange processing by transmitting data numbers indicating necessary data to each other (state 5 in FIG. 5). FIG. 7 shows the flow of this process along the flow of time.
First, the central processing unit 001 of the terminal 0 requests the wireless signal processing unit 002 to start the desired data information exchange processing, and the wireless signal processing unit 002 reads the data number from the storage unit 005 in response to this request. A desired data number signal including the data number is created and transmitted to the terminal 1 via the wireless unit 003. If the data number is 0, that is, if the data required by the terminal 0 does not exist in the terminal 1, “no corresponding data” is transmitted (step S701 in FIG. 7).

Next, the wireless signal processing unit 002 of the terminal 1 receives the desired data number signal from the terminal 0 via the wireless unit 003, and stores the data number included in the desired data number signal in the storage unit 005 (FIG. 7). Step S702).
The wireless signal processing unit 002 of the terminal 1 reads out the data number representing the data required by the terminal 1 from the storage unit 005 and creates a desired data number signal, and confirms that the data from the terminal 0 was successfully received. Along with the ACK shown, it transmits to the terminal 0 via the wireless unit 003 (step S703 in FIG. 7). However, if the data number is 0, that is, if the data required by the terminal 1 does not exist in the terminal 0, the wireless signal processing unit 002 uses “relevant data” instead of the data number for the desired data number signal. Set “None”.
Next, the radio signal processing unit 002 of the terminal 0 receives data from the terminal 1 via the radio unit 003, and stores the desired data number included in the received desired data number signal in the storage unit 005 (FIG. 7). Step S704).
Next, the wireless signal processing unit 002 of the terminal 0 transmits ACK indicating that the data from the terminal 1 has been normally received to the terminal 1 via the wireless unit 003 (step S705 in FIG. 7), and the central processing. The completion of the desired data information exchange process is notified to the section 001.
The wireless signal processing unit 002 of the terminal 1 receives ACK from the terminal 0 via the wireless unit 003 (step S706 in FIG. 7), and notifies the central processing unit 001 of completion of the desired data information exchange processing.

Here, the central processing unit 001 of the terminal 0 receives a notification of completion of the desired data information exchange processing from the wireless signal processing unit 002, and obtains the desired data number of the terminal 0 and the desired data number to the terminal 1 from the storage unit 005. When both are read, that is, when there is no data to be exchanged between the terminal 1 and the terminal 0, the central processing unit 001 determines that it is not necessary to continue the following processing. In order to make another terminal a data exchange partner, the communication start process is started again. Here, even if another terminal device is searched for immediately, the terminal 1 may become the partner again, so the central processing unit 001 determines that it is better to wait for a while. For this reason, the central processing unit 001 outputs a power down signal to the wireless unit 003 via the wireless signal processing unit 002 to save power consumption. The wireless unit 003 inputs this power down signal and performs power down (state 10 in FIG. 5). Next, the central processing unit 001 reads Tda3 (environment change waiting time) indicating the standby time from the storage unit 004, and after this Tda3 has elapsed, the communication start processing is restarted from the beginning (state 0 in FIG. 5). The terminal 1 performs the same process.
Thus, the desired data information exchange process is completed (state 6 in FIG. 5).

<Data exchange processing>
Next, as shown along the flow of time in FIG. 8, the terminal 0 and the terminal 1 perform data exchange processing.
First, the central processing unit 001 of the terminal 0 reads the desired data number of the data required by the terminal 1 from the storage unit 005, reads the corresponding data from the storage unit 004, and reads the data obtained by reading the data group that is a collection of data. It is created based on and output to the wireless signal processing unit 002. The wireless signal processing unit 002 receives data from the central processing unit 001 and transmits the data to the terminal 1 via the wireless unit 003 (step S801 in FIG. 8).
The wireless signal processing unit 002 of the terminal 1 receives the data group from the terminal 0 via the wireless unit 003 and outputs it to the central processing unit 001. The central processing unit 001 inputs a data group from the wireless signal processing unit 002 and writes data included in the data group in the storage unit 004. At this time, if the data is originally stored in the storage area of the terminal 1, the received data is written separately from this, and the data originally stored in the storage unit 004 of the terminal 1 is deleted. Similarly, the central processing unit 001 deletes any index data originally stored in the storage unit 005 of the terminal 1, and instead receives the index data received from the terminal 0 that has been distinguished and stored in the storage area. Leave. (Step S802 in FIG. 8).

Next, the central processing unit 001 of the terminal 1 reads out data required by the terminal 0 from the storage area, creates a data group, and outputs the data group to the wireless signal processing unit 002. The wireless signal processing unit 002 receives the data group from the central processing unit 001 and transmits it to the terminal 0 via the wireless unit 003 together with ACK indicating that the data from the terminal 0 can be normally received (FIG. 8). Step S803).
Next, the radio signal processing unit 002 of the terminal 0 receives the data group and ACK from the terminal 1 via the radio unit 003 and outputs them to the central processing unit 001. The central processing unit 001 inputs the data group and ACK from the radio signal processing unit 002, and stores the data included in the data group received from the terminal 1 in the storage unit 004 (step S804 in FIG. 8). At this time, as with the terminal 1 described earlier, the data and the index data are deleted if there is a corresponding old one, leaving the received one. The central processing unit 001 outputs an ACK transmission request indicating that data from the terminal 1 has been successfully received to the wireless signal processing unit 002, and the wireless signal processing unit 002 passes through the wireless unit 003 to the terminal 1. ACK is transmitted to (step S805 in FIG. 8). The radio signal processing unit 002 of the terminal 0 receives the ACK via the radio unit 003 and outputs it to the central processing unit 001 (step S806 in FIG. 8). Thus, the data exchange process is completed (state 7 in FIG. 5).

  In addition, after the data exchange process with the terminal 1 is completed, the central processing unit 001 of the terminal 0 secures commonality with respect to data other than the data obtained from the terminal 1, so that other terminals are used as data exchange partners. Again from the communication start process. However, if the communication start process is performed immediately, the terminal 1 may become the partner again, so the central processing unit 001 determines that it is better to wait for a while. For this reason, the central processing unit 001 outputs a power down signal to the wireless unit 003 via the wireless signal processing unit 002 to save power consumption. The wireless unit 003 inputs this power down signal and performs power down (state 10 in FIG. 5). Next, the central processing unit 001 reads Tda4 (processing resumption waiting time) representing the standby time from the storage unit 004, and after this Tda4 has elapsed, the communication start processing is restarted from the beginning (state 11 in FIG. 5). The terminal 1 performs the same process.

Further, for the communication start process, the intermittent operation communication start process described below may be used.
<Intermittent operation type communication start processing>
FIG. 9 shows the flow of the intermittent operation type communication start process along the flow of time. The central processing unit 001 with the terminal 0 requests the wireless signal processing unit 002 to start the intermittent operation type communication start process. Upon receiving this request, the wireless signal processing unit 002 reads Tr, Ts, and Trc representing the length of time from the storage unit 004 via the central processing unit 001. Next, the radio signal processing unit 002 requests the radio unit 003 to receive a radio signal from another terminal during Tr (reception duration), and the radio unit 003 receives the radio signal and receives it. . The wireless signal processing unit 002 repeatedly outputs the request for reception processing at a cycle of Trc (reception interval time). The same applies to the terminal 1 (steps R01, 02, steps R11, R12 in FIG. 9).
In addition, the radio signal processing unit 002 between the terminal 0 and the terminal 1 makes a reception processing request at the cycle Trc, and at a certain cycle Ts, the time until Tr, Trc and the next reception state are started. The wireless unit 003 is requested to transmit a data sharing network construction signal including (steps S01 to 05 and steps S11 to S15 in FIG. 9). The data sharing network construction signal is transmitted to an unspecified terminal device. The wireless unit 003 between the terminal 0 and the terminal 1 transmits data.
Then, the wireless signal processing unit 002 between the terminal 0 and the terminal 1 outputs a power-down signal and suppresses power consumption of the wireless unit 003 unless data is transmitted or is in a reception state.

Initially, as shown in FIG. 9, the terminal 0 and the terminal 1 are out of range with each other, and therefore, the radio waves transmitted to each other cannot be received, but enter the range at the timing of T0.
After T0, the wireless signal processing unit 002 of the terminal 1 transmits a data sharing network construction signal via the wireless unit 003 (step S14 in FIG. 9), and the image of the wireless signal processing unit 002 of the terminal 0 is the wireless unit. Received via 003 (step R02 in FIG. 9). The radio signal processing unit 002 of the terminal 0 analyzes the received data sharing network construction signal and detects the timing when the terminal 1 enters the reception state next from Tr, Trc, and the time until the next reception state is started. In accordance with this, the data sharing network reception signal is transmitted to the terminal 1 via the wireless unit 003 (step S06 in FIG. 9). In addition, the wireless signal processing unit 002 of the terminal 0 requests reception to the wireless unit 003 in order to wait for a response from the terminal 1, and the wireless unit 003 performs reception (step R03 in FIG. 9).

Next, the radio signal processing unit 002 of the terminal 1 receives the data sharing network reception signal from the terminal 0 via the radio unit 003 (step R12 in FIG. 9), and receives the data sharing network reception signal to the terminal 0. An ACK to be transmitted is transmitted via the wireless unit 003, and “intermittent operation type communication start process completion” is notified to the central processing unit 001 (step S16 in FIG. 9).
The radio signal processing unit 002 of the terminal 0 receives ACK from the terminal 1 via the radio unit 003, and notifies the central processing unit 001 of “completion of start processing of intermittent operation type communication” (step R03 in FIG. 9).
Thereby, the start processing of the intermittent operation type communication between the terminal 0 and the terminal 1 is completed.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and includes design changes and the like within a scope not departing from the gist of the present invention. It is.
For example, in the communication start processing, the terminal 0 first checks that other terminals are performing transmission / reception processing on the network. This processing is performed using a CSMA / CS (Carrier Sense Multiple Access Content Symbol) method. You may apply.
Alternatively, the number of terminals in FIG. 1 is four, but the number may be more or less as long as it is two or more.
In addition, the present embodiment can be applied to, for example, a case where a document or the like is shared via a wireless LAN (Local Area Network) in a meeting in a company or a public office.
Further, the present embodiment can be applied to, for example, sharing data via a wireless LAN in an organization such as a company or a public office.
In addition, this embodiment is applied when, for example, a person in charge of a window, a conductor, a driver, or the like when a wireless LAN is installed in a station premises shares data using a PDA or a portable personal computer. be able to.
Alternatively, in the present embodiment, for example, a plurality of crime prevention sensors having the function of the terminal device in the present embodiment are installed in a general home, and the position of the intruder into the house is used as data, and this data is used as the data. It can be applied by sharing between sensors.

It is a time chart showing the flow of a process of the data sharing communication method by embodiment of this invention. It is a figure which shows the system to which the data sharing communication method by embodiment of this invention is applied. It is a figure showing the index data in embodiment of this invention. It is a block diagram of the terminal device in the embodiment of the present invention. It is a state transition diagram showing the state transition of the terminal device in the process of embodiment of this invention. It is a time chart showing the flow of the index data exchange process in embodiment of this invention. It is a time chart showing the flow of the desired data information exchange process in embodiment of this invention. It is a time chart showing the flow of the data exchange process in embodiment of this invention. It is a time chart showing the flow of the start process of intermittent operation type | mold communication in embodiment of this invention.

Explanation of symbols

0, 1, 2, 3 ... terminal 001 ... central processing unit 002 ... wireless signal processing unit 003 ... wireless unit 004, 005 ... storage unit 006 ... operation unit 007 ... display unit

Claims (12)

In a communication method in which a plurality of terminal devices including a first terminal device and a second terminal device transmit and receive data by wireless communication,
The first terminal device transmits a data exchange start request to another unspecified terminal device,
The second terminal device receives the data exchange start request transmitted by the first terminal device, and transmits a data exchange participation request to the first terminal device;
The first terminal device receives the data exchange participation request transmitted by the second terminal device, and the first terminal device receives index data including update information regarding data stored in the first terminal device. To the terminal device,
The second terminal device receives the index data of the first terminal device transmitted by the first terminal device, and the second terminal device receives index data including update information related to data stored in the second terminal device. To the first terminal device,
The first terminal device receives the index data of the second terminal device transmitted by the second terminal device, and transmits identification information of desired data from the index data to the second terminal device. And
The second terminal device receives the identification information of the data desired by the first terminal device transmitted from the first terminal device, and the desired data from the index data received from the first terminal device. Is transmitted to the first terminal device,
The first terminal device receives identification information of data desired by the second terminal device transmitted by the second terminal device, and transmits data desired by the second terminal device to the second terminal device. Send to
The second terminal device receives data desired by the second terminal device transmitted by the first terminal device, and transmits data desired by the first terminal device to the first terminal device. ,
The data sharing communication method, wherein the first terminal device receives data desired by the first terminal device transmitted by the second terminal device.   2. The data according to claim 1, wherein the first terminal device transmits the data exchange start request when another terminal device is not transmitting a radio wave other than a data exchange start request. Shared communication method.   When the first terminal device transmits a radio wave other than the data exchange start request before transmitting the data exchange start request, the first terminal device has a predetermined transmission waiting time and a transmission / reception function. And repeatedly confirming whether another terminal device is transmitting a radio wave other than a data exchange start request after the elapse of the transmission standby time. Item 3. The data sharing communication method according to any one of Items 2 to 3.   The first terminal device continues a predetermined participation waiting time and reception state after transmitting the data exchange start request, and transmits the data exchange start request again when the data exchange participation request is not received. 4. The data sharing communication method according to claim 1, wherein the data sharing communication method is repeated.   5. The data sharing communication method according to claim 4, wherein the first terminal device stops a predetermined environment improvement waiting time and a transmission / reception function after the predetermined participation waiting time elapses. The first terminal device continues a reception state for a predetermined reception duration time after a predetermined reception interval time, and the terminal 1 receives the data exchange start request at a predetermined transmission time interval. The data sharing communication method according to claim 1, further comprising transmitting information including timing information.   The data sharing communication method according to claim 6, wherein the first terminal device stops a transmission / reception function during the reception interval time while transmission / reception is not performed.   The second terminal apparatus detects timing of reception processing of the first terminal apparatus from the timing information transmitted by the first terminal apparatus, and transmits the data exchange participation request. A data sharing communication method according to any one of claims 6 and 7.   When the first terminal device has zero data identification information desired by the first terminal device and the second terminal device has zero data identification information, the predetermined information The data sharing communication method according to any one of claims 1 to 8, wherein an environment change waiting time and a transmission / reception function are stopped, and the data exchange start request is transmitted after the environment change waiting time elapses. .   The data sharing according to any one of claims 1 to 9, wherein the first terminal device transmits the data exchange start request after receiving data desired by the first terminal device. Communication method. The said 1st terminal device stops the transmission / reception function for a predetermined | prescribed process resumption waiting time after reception of the data which the said 1st terminal device desires, The claim 1 characterized by the above-mentioned. Data sharing communication method. In a communication system in which a plurality of terminal devices including a first terminal device and a second terminal device transmit and receive data by wireless communication,
In the first terminal device,
A process of transmitting a data exchange start request to another unspecified terminal device;
A process of receiving radio waves from other unspecified terminal devices;
Processing for receiving a data exchange participation request or a data exchange start request from the second terminal device;
Processing for transmitting index data including update information regarding data stored therein to the second terminal device;
Processing for receiving the index data of the second terminal device transmitted by the second terminal device;
Processing for transmitting identification information of desired data from the index data to the second terminal device;
A process of receiving identification information of data desired by the second terminal device transmitted by the second terminal device;
A process of transmitting data desired by the second terminal device to the second terminal device;
The program for performing the process which receives the data which the said 1st terminal device transmits which the said 2nd terminal device transmitted.

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