TW201417608A - Wireless communication device, wireless communication system, wireless communication method and program - Google Patents

Abstract

This invention provides a wireless communication device capable of reducing the probability of collisions. The communication part (101) of the present invention is connected with a plurality of terminals. An detection part (103) inspects the terminals connected with the communication part. A timing decision part (104), according to the number of terminals inspected by the detection part (103), decides the transmission timing of each terminal for transmitting data. A timing instruction part (105), using the transmission timing decided by the timing decision part (104), transmits the transmission instruction of the transmitted data to each terminal.

Description

Wireless communication device, wireless communication system, wireless communication method and program

The present invention relates to a wireless communication device, a wireless communication system, a wireless communication method, and a program.

In the case of transmitting data through a communication network, when multiple pieces of data are simultaneously transmitted, a collision occurs and the data transmission fails. In this case, it is necessary to transmit the data that has failed to be transmitted again, and data delay, communication efficiency is reduced, and power consumption is increased.

In this regard, Patent Document 1 and Patent Document 2 disclose techniques for reducing the influence of collisions by adjusting the timing of transmitting data.

Specifically, in Patent Document 1, it is disclosed that the parent machine divides the start signal used for the slave to notify the parent machine, and sequentially transmits the divided plurality of start signals to the check data of the child machine at intervals. Collection system.

Further, in Patent Document 2, it is disclosed that each terminal that transmits multi-purpose data other than inspection data and inspection data by multi-hop wireless communication limits the number of signal frames transmitted once, and checks the data. When the amount of data exceeds the number of specific signal frames, the inspection data collection system for the remaining inspection data is transmitted after a certain period of rest.

In this way, the techniques disclosed in Patent Document 1 and Patent Document 2 During the operation, since the data transmitted by the specific device is dispersed and transmitted, the delay time in the event of a collision can be reduced.

[Prior patent documents] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-015879

[Patent Document 2] Japanese Patent Publication No. 2011-082672

However, in the techniques described in Patent Document 1 and Patent Document 2, since the parent machine or each terminal does not consider the transmission time point of the data of the other terminal, but determines the transmission time point autonomously, there may be data in the plurality of terminals. The case where the transmission time points overlap and a collision occurs. For this reason, it is impossible to reduce the possibility of collision.

Specifically, in the technique described in Patent Document 1, although the transmission interval between data transmitted by one terminal is adjusted, the transmission interval between data transmitted by a plurality of terminals is not adjusted. Further, in the technique described in Patent Document 2, since it is a system for transmitting data by multi-hop wireless communication, it is not necessary to measure the occurrence of collision by transmitting data to the same base station by a plurality of terminals.

It is an object of the present invention to provide a wireless communication device, a wireless communication system, a wireless communication method, and a program that can reduce the possibility of collision occurrence.

A wireless communication device according to the present invention includes: a communication unit connected to a plurality of terminals; a detection unit that detects the terminal connected to the communication unit; and determines a data transmission by each terminal based on the number of terminals detected by the detection unit. a time point determining unit at the time of transmission; and a time point indicating unit that transmits a transmission instruction of the transmission data to each terminal by the transmission time point determined by the time point determining unit.

A wireless communication system according to the present invention includes: a plurality of terminals; and a wireless communication device connected to the plurality of terminals, the wireless communication device having: a communication unit connected to the plurality of terminals; detecting the communication a detection unit of the terminal connected to the unit; a time point determination unit that determines a transmission time point of each terminal transmission data according to the number of terminals detected by the detection unit; and a transmission time transmission instruction point determined by the transmission time point determined by the time point determination unit The time point indication unit that is transmitted to each terminal.

According to the wireless communication method of the present invention, the plurality of terminals connected to the wireless communication device are detected, and the transmission time point of the transmission data of each terminal is determined according to the number of terminals detected as described above, and is transmitted by using the determined transmission time point. The transmission instruction of the data is transmitted to each terminal.

According to the program of the present invention, the steps of detecting the plurality of terminals are performed on a computer connected to the plurality of terminals; and the step of transmitting the data transmission time of each terminal is determined according to the number of detected terminals; and utilizing The above-mentioned determined transmission time point, the step of transmitting a transmission instruction of the transmission data to each terminal.

According to the present invention, collision occurrence can be reduced.

100‧‧‧Base station (wireless communication device)

101‧‧‧Wireless Communications Department

102‧‧‧Memory Department

103‧‧‧Detection Department

104‧‧‧Transfer time determination unit (time point decision unit)

105‧‧‧Information Generation Department (Time Point Instruction Department)

MR‧‧‧Check terminal (1st terminal)

201‧‧‧meter

202‧‧‧Check data generation department

203‧‧‧Wireless Communications Department

MS‧‧‧General terminal (2nd terminal)

Fig. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a phenomenon caused when each inspection terminal randomly transmits inspection data in the wireless communication system of the comparative example of the present invention.

3 is a block diagram of a base station in the wireless communication system of FIG. 1.

4 is an explanatory diagram showing an example of a method of adjusting a transmission time point of each inspection terminal in the wireless communication system of FIG. 1.

Fig. 5 is a view showing the configuration of the inspection terminal of Fig. 1.

Fig. 6 is a flow chart for explaining an operation example of the base station of Fig. 3.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the present specification and the drawings, constituent elements having the same functions are denoted by the same reference numerals, and the description thereof will not be repeated.

Fig. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. The wireless communication system 10 shown in FIG. 1 includes a base station 100, a plurality of inspection terminals MR, and a plurality of general terminals MS. Further, in the following, the inspection terminal MR and the general terminal MS are also collectively referred to as terminals.

The base station 100 is connected to the inspection terminal MR and the general terminal MS via a wireless communication network (not shown). The base station 100 receives inspection data from the inspection terminal MR. Further, the base station 100 receives the universal data other than the inspection data from the general terminal MS.

The inspection terminal MR is an example of a first terminal that transmits inspection data to the base station 100 at a specific cycle. Check terminal MR system has a meter and borrow Inspection data is generated by inspection of the meter's meter. The gauge that the terminal MR has is metered, for example, the amount of electricity, gas, or water used. The value indicated by the meter of the meter is, for example, an accumulated value of the usage amount. The inspection data contains the cumulative value and the date and time of the inspection. The inspection terminal MR is a timepiece having a calculation time, and transmits inspection data to the base station 100 in a specific cycle.

The general terminal MS is an example of a second terminal that is a general-purpose data that transmits/receives data other than the inspection data to and from the base station 100. The general terminal MS is, for example, an information processing device such as a PC (Personal Computer), a mobile phone, or a television. Further, the general terminal MS may be a refrigerator, a microwave oven, a cooling and heating machine or the like equipped with a communication function, in addition to the information processing device exemplified above.

In the wireless communication system 10, when a plurality of terminals simultaneously access the base station 100, collisions between data occur.

FIG. 2 is an explanatory diagram for explaining a phenomenon caused when each inspection terminal randomly transmits inspection data in the wireless communication system of the comparative example of the present invention. In FIG. 2, it shows the time when each inspection terminal MR attempts to transmit the inspection data, the access time point to the wireless communication network, that is, the Ranging Time, and the time at which each inspection terminal MR actually transmits the inspection data. .

As shown in FIG. 2, when the inspection data is randomly transmitted by each inspection terminal MR, a situation in which the inspection data is transmitted is concentrated between the inspection terminals MR. In the case where the inspection data is concentrated, the possibility of collision between the inspection data is increased, and the possibility of collision between the general-purpose data and the inspection data transmitted by the general terminal MS (not shown) is also improved.

At this time, in the general-purpose data transmitted by the general terminal MS, there is For example, the case where the immediacy request is high according to the voice data of the call function. In the case of delays in data with high immediacy requirements, the quality of service is significantly reduced. On the other hand, the inspection data is a material with low immediacy requirements, and most of them do not cause problems even if the information is slightly delayed for the quality of service. Therefore, the base station 100 does not adjust the transmission time point of the general-purpose data transmitted by the general terminal MS, but adjusts the transmission time of the inspection data transmitted by the inspection terminal MR to make the inspection data interspersed between the plurality of inspection terminals MR. Transfer.

Next, Fig. 3 is a configuration diagram of the base station 100 according to the present embodiment. The base station 100 shown in FIG. 3 includes a wireless communication unit 101, a detection unit 103, a storage unit 102, a transmission time point determination unit 104, and a message generation unit 105.

The wireless communication unit 101 is connected to a plurality of terminals via a wireless communication network, and receives/transmits data. Further, the wireless communication unit 101 is, for example, a communication interface based on WiMAX (Worldwide Interoperability for Microwave Access) of the specification of the wireless communication technology. In the WiMAX-based communication interface, there is a limit on the number of terminals that can be simultaneously accessed. Therefore, in the wireless communication unit 101 based on the communication interface based on WiMAX, when a terminal of a limited number or more is simultaneously accessed, collision occurs.

The memory unit 102 memorizes the terminal information. The inspection terminal information includes discrimination information of the inspection terminal MR connected to the wireless communication unit 101.

The detecting unit 103 detects the terminal to which the wireless communication unit 101 is connected. The detecting unit 103 is determined based on, for example, the inspection terminal MR and the general terminal MS. For other information, the terminal that distinguishes the connection is the check terminal MR or the general terminal MS. The detecting unit 103 generates inspection terminal information including the identification information of the inspection terminal MR among the detected terminals, and stores the information in the memory unit 102. Further, the detecting unit 103 updates the inspection terminal information stored in the storage unit 102 every time the inspection terminal information is generated.

The transmission time point determination unit 104 obtains the number of inspection terminals MR detected by the detection unit 103 by counting the number of pieces of discrimination information included in the inspection terminal information stored in the storage unit 102. The transmission time point determining unit 104 determines the time point at which each of the inspection terminals MR transmits the inspection data in accordance with the number of the inspection terminals MR obtained.

FIG. 4 is an explanatory diagram showing a specific example of a method of determining the transmission time point of each inspection terminal MR by the base station 100 of the radio communication system 10 according to the present embodiment. In FIG. 4, the base station 100 is connected to the inspection terminals MR1 to MR7 as the inspection terminal MR.

The transmission time point determination unit 104 determines each transmission time point so that the transmission time points of the respective inspection terminals MR are dispersed in the transmission period in accordance with the specific transmission period and the number of the number of inspection terminals MR that have been counted.

Specifically, the transmission time point determination unit 104 obtains the time T at which the transmission period is divided by the number of inspection terminals MR. Further, in the transmission period, the transmission time points of the respective inspection terminals MR are allocated such that the inspection terminals MR sequentially transmit the inspection data in accordance with each time T. For example, the transmission time point determining unit 104 sets the start time t1 of the transmission period as the transmission time point of the inspection terminal MR1, checks that the transmission time point of the terminal MR2 is t1+T, and the transmission time point of the inspection terminal MR3 is t1+2T. The transmission time point is also determined for the inspection terminals MR4 to MR7.

Further, the transmission time point determining unit 104 determines the transmission time point of each inspection terminal MR every time the inspection terminal information stored in the storage unit 102 is updated. Further, since the inspection terminal information is updated every time the inspection terminal MR connected to the wireless communication unit 101 changes, the transmission time point determination unit 104 determines each time the inspection terminal MR connected to the wireless communication unit 101 changes. The transmission time point of each inspection terminal MR.

Returning to the description of FIG. The message generation unit 105 is an example of a time point instruction unit that transmits a transmission instruction of the transmission inspection data to each terminal by the transmission time point determined by the transmission time point determination unit 104. Specifically, the message generation unit 105 generates a transmission instruction message for transmitting the examination data by the transmission time point determined by the transmission time point determination unit 104, and transmits the generated transmission instruction message to each inspection terminal MR by the wireless communication unit 101. And, for each inspection terminal MR, the transmission time point is indicated. Further, the message generation unit 105 may generate a transmission time point indication message for all of the inspection terminals MR, or may generate a transmission time point indication message only when the time of each inspection terminal MR transmits the inspection data.

Next, Fig. 5 is a configuration diagram of the inspection terminal according to the embodiment. The inspection terminal MR shown in FIG. 5 includes a meter 201, an inspection data generation unit 202, and a wireless communication unit 203.

The meter 201 is a cumulative value for measuring the amount of electricity, gas, or water used.

The inspection data generation unit 202 checks the gauge 201 to generate inspection data indicating the usage amount. The inspection data generation unit 202 transmits the generated inspection data to the base station 100 via the wireless communication unit 203. The inspection data generation unit 202 checks the gauge 201 at a specific inspection interval. Inspection data generation department 202 typically transmits the generated inspection data to the base station 100 periodically using a specific cycle. Further, when receiving the transmission time point instruction message from the base station 100, the inspection data generation unit 202 adjusts the transmission time point in response to the transmission time point instruction message, and transmits the inspection data by the transmission time point instructed from the base station 100.

The wireless communication unit 203 is connected to the base station 100 via a wireless communication network. The wireless communication unit 203 transmits the inspection data input from the inspection data generation unit 202 to the base station 100. Further, the wireless communication unit 203 receives the transmission time point instruction message from the base station 100, and inputs the received transmission time point instruction message to the inspection data generation unit 202.

Next, Fig. 6 is a flowchart for explaining an operation example of the base station according to the embodiment.

First, the detecting unit 103 detects the inspection terminal MR connected to the base station 100 (step S100). Further, the detecting unit 103 determines whether or not the detected inspection terminal has changed from the previously detected inspection terminal MR (step S105).

When the inspection terminal MR connected to the base station 100 changes, the detection unit 103 updates the inspection terminal information stored in the storage unit 102 based on the detection result of this time, and then updates the update completion information of the inspection terminal information. The transmission is made to the transmission time determination unit 104 (step S110). On the other hand, when there is no change in the inspection terminal MR connected to the base station 100, the process returns to the process of step S100.

When the transmission time determination unit 104 receives the update completion information, the number of inspection terminals MR connected to the base station 100 is obtained by counting the identification information of the inspection terminal MR included in the inspection terminal information (step S115). Furthermore, The transmission time point determination unit 104 determines the transmission time point of each inspection terminal MR based on the obtained number of inspection terminal MRs (step S120).

In addition, the message generation unit 105 transmits a transmission instruction of the transmission inspection data to each of the inspection terminals MR by the transmission time point determined by the transmission time point determination unit 104, and instructs the transmission time point (step S125).

As described above, according to the present embodiment, the transmission time of the transmission data of each terminal is determined in accordance with the number of terminals connected to the base station 100. Thereby, since it is possible to suppress the overlap of the time at which the data is transmitted between the plurality of terminals connected to the base station 100, it is possible to reduce the possibility of occurrence of collision.

Further, by reducing the possibility of collision occurrence, the wireless communication system 10 of the present embodiment can maintain high communication efficiency and reduce power consumption of the inspection terminal MR and the general terminal MS. In the event of a collision that causes the data transfer to fail, the data that has failed to be transmitted must be transmitted again. For this reason, in the event of a collision, the communication efficiency is lowered, and at the same time, the inspection terminal MR and the general terminal MS are excessively consumed with the power for retransmitting the data. On the other hand, since the possibility of re-transmitting data is reduced by reducing the possibility of collision occurrence, it is possible to maintain high communication efficiency while reducing power consumption.

Further, in the present embodiment, each transmission time point is determined such that the transmission time point of each terminal is dispersed during the transmission period. Thereby, since the time point of transmitting the data is dispersed during the transmission period, the possibility of collision can be more reliably reduced.

Further, in the present embodiment, the terminal connected to the base station 100 includes an inspection terminal MR that transmits inspection data generated by the inspection gauge, and a general terminal MS that transmits data other than the inspection data. In addition to the base station 100 Among the connected terminals, the transmission time point is determined according to the inspection terminal MR, and the transmission time point is indicated for each inspection terminal. When the transmission time of the data with high immediacy requirement is adjusted, the quality of service is delayed for the delay of the data with high immediacy demand, but in the present embodiment, the transmission is adjusted only for the inspection data with low immediacy requirement. Time. Therefore, it is possible to reduce the possibility of collision while suppressing the deterioration of the service quality.

Further, in the present embodiment, each time the terminal connected to the wireless communication unit 101 changes, the transmission time point is determined. Thereby, even if there is a change in the system configuration, the possibility of collision occurrence can be surely reduced.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the embodiments described above. For the constitution or details of the present invention, various changes that can be understood by the practitioner can be made within the scope of the present invention.

For example, in the above-described embodiment, the radio communication system in which the base station 100 is connected to the inspection terminal MR and the general terminal MS will be described, but the present invention is not limited to this example. For example, the present technology can also be applied to a wireless communication system that does not include a general terminal MS and is configured by the inspection terminal MR and the base station 100.

Further, in the above-described embodiment, the transmission timing of the inspection terminal MR for transmitting the inspection data is adjusted, but the present invention is not limited to this example. As with the inspection data, the present invention can be applied to adjust the transmission time point for all materials with low immediacy requirements.

Further, in the above-described embodiment, the detection unit 103 transmits the update end information to the transmission time point determination unit 104 every time the inspection terminal information stored in the storage unit 102 is updated, and causes the transmission time point determination unit 104 to detect the detection. The update of the terminal information is checked, but the present invention is not limited to this illustration. For example, the transmission time point determining unit 104 may periodically monitor the inspection terminal information stored in the storage unit 102 to detect the update of the inspection terminal information.

Further, in the above-described embodiment, the inspection value which is the cumulative value of the usage amount is used as the inspection data, but the present invention is not limited to this example. For example, the inspection data may be the usage amount of the specific period obtained from the inspection value. In this case, the inspection data generation unit 202 memorizes the acquired inspection value, and obtains the usage amount by obtaining the difference between the previous inspection value and the current inspection value.

In the above-described embodiment, the wireless communication system 10, the device configuration including the base station 100 and the inspection terminal MR of the radio communication system 10, and the radio communication method of the base station 100 will be described. However, the description may be provided. There are programs for realizing the respective functions of the base station 100 and the inspection terminal MR, or a recording medium for storing the programs.

The present invention claims priority based on Japanese Patent Application No. 2012-230541, filed on Oct.

100‧‧‧Base Station

MR‧‧‧Check terminal

MS‧‧‧General Terminal

Claims (7)

A wireless communication device comprising: a communication unit connected to a plurality of terminals; a detection unit that detects the terminal connected to the communication unit; and determines a time point at which a transmission time of each terminal transmits data according to the number of terminals detected by the detection unit And a time point instruction unit that transmits a transmission information transmission instruction to each terminal by the transmission time point determined by the time point determination unit. In the wireless communication device according to the first aspect of the invention, the time point determining unit determines the respective transmission time points such that the transmission time point of each end is dispersed in a specific transmission period. The wireless communication device according to the first aspect of the invention, wherein the terminal includes: a first terminal that transmits inspection data generated by the inspection meter, and a second terminal that transmits data other than the inspection data, and the time point determination unit The transmission time point of each of the first terminals is determined based on the number of the first terminals in the terminal, and the time indication unit transmits the transmission instruction to each of the first terminals. The wireless communication device according to claim 1, wherein the time point determining unit determines the transmission time point every time the terminal connected to the wireless communication unit changes. A wireless communication system comprising: a plurality of terminals; and a wireless communication device connected to the plurality of terminals, the wireless communication device having: a communication unit connected to the plurality of terminals; a detection unit that detects the terminal connected to the communication unit; a time point determination unit that determines a transmission time point of each terminal transmission data according to the number of terminals detected by the detection unit; and the use of the aforementioned point in time At the time of transmission determined by the decision unit, the transmission instruction of the transmission data is transmitted to the time indication unit of each terminal. A wireless communication method for detecting a plurality of terminals connected to a wireless communication device, determining a transmission time point of transmission data of each terminal according to the number of detected terminals, and transmitting a transmission instruction of the transmission data to the determined transmission time point to Each terminal. a program, on a computer connected to a plurality of terminals, for performing the following steps: detecting the plurality of terminals; and determining a time point for transmitting the data transmitted by each terminal according to the number of detected terminals; and The step of transmitting a transmission instruction of the transmission data to each terminal by using the aforementioned determined transmission time point.