JP6971660B2 - Mobile monitoring device, mobile monitoring system, and mobile monitoring method - Google Patents

Description

The present invention mainly relates to a mobile object monitoring system for monitoring a mobile object.

Conventionally, there has been known a mobile body monitoring system in which a handset is attached to a moving body to be monitored and the handset receives information transmitted by the handset to monitor the moving body. Patent Documents 1 and 2 disclose this kind of technology.

In the biological monitoring system of Patent Document 1, a time schedule is assigned in advance for each slave unit. Each slave unit transmits information according to the assigned time schedule (time slot). As a result, communication between a large number of devices can be realized even when the number of channels is small.

In the mobile monitoring system of Patent Document 2, the slave unit transmits information in the assigned time slot and another information using another frequency channel in the unassigned time slot. As a result, the master unit can receive a plurality of types of information from the plurality of slave units.

Japanese Unexamined Patent Publication No. 2016-49037 Japanese Unexamined Patent Publication No. 2016-1699667

Further, in the devices and the like described in Patent Documents 1 and 2, the master unit collects information from the slave unit in the time slot assigned in advance. In addition to this, in order to collect information about the master unit (master unit information), the master unit needs to transmit information in a pre-assigned time slot like the slave unit, so it is assigned to the slave unit. There may be fewer time slots.

The present invention has been made in view of the above circumstances, and a main object thereof is a mobile monitoring device capable of transmitting information using a time slot without reducing the time slot assigned to the slave unit. Is to provide.

Means and effects to solve problems

The problem to be solved by the present invention is as described above, and next, the means for solving this problem and its effect will be described.

According to the first aspect of the present invention, a mobile monitoring device having the following configuration is provided. That is, this mobile monitoring device includes a wireless communication unit and a calculation unit. The wireless communication unit receives handset information about the handset from at least one handset attached to the mobile body. The calculation unit identifies an empty time slot that is a time slot that is not actually assigned to the slave unit among the time slots that can be assigned to the slave unit, and the master unit information about the own unit in the empty time slot. Is transmitted to the wireless communication unit.

According to the second aspect of the present invention, a mobile monitoring system having the following configuration is provided. That is, this mobile body monitoring system includes at least one slave unit attached to the mobile body and a plurality of master units. The handset wirelessly transmits handset information about the handset in the assigned time slot. The master unit includes a calculation unit and a wireless communication unit. The arithmetic unit identifies an empty time slot that is a time slot that is not actually assigned to the slave unit among the time slots that can be assigned to the slave unit. The wireless communication unit receives the slave unit information transmitted by the slave unit, and transmits the master unit information which is information about the master unit in the empty time slot specified by the calculation unit.

According to the third aspect of the present invention, the following mobile monitoring method is provided. That is, this mobile object monitoring method is performed by using a master unit that acquires slave unit information regarding the slave unit from at least one slave unit mounted on the mobile unit. The master unit receives the slave unit information from the slave unit using the wireless communication unit. The master unit identifies an empty time slot that is a time slot that is not actually assigned to the slave unit among the time slots that can be assigned to the slave unit. The master unit transmits information about the master unit, which is information about the master unit, using the wireless communication unit in the empty time slot.

As a result, since the empty time slot is a time slot that can be assigned to the slave unit after the fact, it is assigned to the slave unit as compared with the configuration in which the master unit information is transmitted in the time slot assigned in advance to the master unit. It is possible to secure many time slots for this.

The explanatory view which shows the schematic structure of the mobile body monitoring system which concerns on one Embodiment of this invention. Block diagram of master unit and slave unit. The front view which shows the shape of the master unit and an example of the information displayed on the master unit. A flowchart showing a process of determining a time slot for transmitting master unit information. The figure which shows an example of the allocation situation of a time slot. The figure which shows the difference of the carrier sense setting between a slave unit and a master unit. The figure which shows the difference in the carrier sense setting between the master unit which succeeded in transmitting the master unit information last time, and the master unit which failed in the transmission of master unit information last time.

Next, an embodiment of the present invention will be described with reference to the drawings. First, with reference to FIG. 1, the overall configuration of the mobile monitoring system 100 and the like will be described. FIG. 1 is an explanatory diagram showing a schematic configuration of a mobile monitoring system 100.

The mobile monitoring system 100 is used by a hunter to grasp the position of the hunting dog when the hunter hunts with the hunting dog. Specifically, the mobile monitoring system 100 is composed of a plurality of master units (mobile monitoring device, hunter terminal) 10 and one or a plurality of slave units (monitored device, hunting dog terminal) 20. There is.

Each hunting dog is equipped with a handset 20. The slave unit 20 acquires the position of the own unit (that is, the position of the mounted hunting dog), the surrounding voice, and the like, and wirelessly transmits the position to the master unit 10. Each hunter carries a master unit 10. The master unit 10 receives the position transmitted by the slave unit 20 and displays it on the map, or reproduces the voice transmitted by the slave unit 20. With this configuration, the hunter can grasp the position of each hunting dog, the surrounding situation of each hunting dog, and the like.

Next, a detailed configuration of the master unit 10 and the slave unit 20 will be described with reference to FIGS. 2 and 3. As shown in FIG. 2, the master unit 10 includes a GNSS receiver 11, a calculation unit 12, a modulation / demodulation unit 14, a wireless communication unit 15, a speaker 16, a display unit 17, and an operation unit 18. .. Further, each part constituting the master unit 10 is driven by a battery (not shown).

The GNSS receiver 11 receives the radio wave transmitted by the GNSS satellite 60 via the GNSS antenna 11a. The GNSS receiver 11 analyzes this radio wave and performs GNSS positioning to calculate the position of its own device. Further, since the GNSS receiver 11 performs GNSS positioning, it is possible to acquire the GNSS time, which is an extremely accurate time. As the GNSS satellite, there are GPS satellites, QZSS satellites, GLONASS satellites, GALILEO satellites and the like, and the present invention can be applied to any of them. If the high-precision time can be shared by the master unit 10 and the slave unit 20, a time other than the GNSS time may be used.

The arithmetic unit 12 is an arithmetic unit such as FPGA, ASIC, or CPU. The arithmetic unit 12 is configured to be able to execute various processes related to the master unit 10 by reading a program created in advance into, for example, a RAM and executing the program. The calculation unit 12 generates, for example, information to be transmitted to the outside, analyzes information received from the outside, and generates information to be displayed on the display unit 17.

The storage unit 13 is a non-volatile storage device capable of storing information, and is, for example, a flash memory such as a flash disk and a memory card. The storage unit 13 stores wireless communication settings (for example, time slot allocation status described later) and information received from the outside.

The modulation / demodulation unit 14 performs modulation and demodulation in wireless communication. Specifically, information for transmission to the outside generated by the arithmetic unit 12 is input to the modulation / demodulation unit 14. The modulation / demodulation unit 14 modulates this information by a method according to the communication method and outputs it to the wireless communication unit 15. The modulation / demodulation performed by the modulation / demodulation unit 14 may be analog modulation / demodulation or digital modulation / demodulation.

The wireless communication unit 15 transmits the modulated information input from the wireless communication unit 15 to the outside via the wireless communication antenna 15a. The information transmitted by the wireless communication unit 15 to the slave unit 20 includes, for example, setting information for wireless communication (for example, a channel to be used and a time slot assigned to the slave unit 20). The information transmitted by the wireless communication unit 15 to the other master unit 10 includes, for example, the position of the master unit 10, the remaining battery level, and GNSS satellite information (the GNSS satellite capable of receiving radio waves at a level equal to or higher than the threshold value). Number, etc.), message, etc. In the following, the information transmitted by the master unit 10 to the other master unit 10 and the information of the source master unit 10 will be referred to as the master unit information. The information constituting the master unit information may be different from the above.

Further, the wireless communication unit 15 receives the information transmitted by the other master unit 10 and the slave unit 20 and the like via the wireless communication antenna 15a. The information received by the wireless communication unit 15 from the slave unit 20 includes the position and voice of the slave unit 20 described above, the remaining battery level of the slave unit 20, GNSS satellite information, and the like. In the following, the information transmitted by the slave unit 20 to the master unit 10 and the information of the slave unit 20 of the transmission source will be referred to as slave unit information. The information constituting the slave unit information may be different from the above. The slave unit information received by the wireless communication unit 15 is output to the modulation / demodulation unit 14. The modulation / demodulation unit 14 demodulates the information input from the wireless communication unit 15 and outputs the information to the calculation unit 12, the speaker 16, and the like.

The speaker 16 outputs (reproduces) this voice by inputting the voice information received from the slave unit 20. As a result, the hunter can grasp the situation around the handset 20 based on the barking of the hunting dog and the like.

The calculation unit 12 creates a video to be displayed on the display unit 17 based on the information (master unit information and slave unit information) received from the outside. The display unit 17 is a liquid crystal display, an organic EL display, or the like, and displays an image created by the calculation unit 12. FIG. 3 shows an example of an image displayed on the display unit 17. In FIG. 3, the own unit icon 41, the slave unit icon 42, and the master unit icon 43 are displayed on the map. The own machine icon 41 is an icon indicating the position of the own machine. The position of the own machine is calculated by the GNSS receiver 11 as described above. The slave unit icon 42 indicates the position of the slave unit 20 received by wireless communication. The master unit icon 43 indicates the position of another master unit 10 received by wireless communication. Further, the screen shown in FIG. 3 is an example, and the display of the slave unit icon 42 can be omitted, the display of the master unit icon 43 can be omitted, or the battery can be additionally displayed.

The operation unit 18 can perform operations related to wireless communication settings, information to be displayed, settings for outputting the voice of the slave unit 20 from the speaker 16, and the like.

As shown in FIG. 2, the slave unit 20 includes a GNSS receiver 21, a calculation unit 22, a storage unit 23, a modulation / demodulation unit 24, a wireless communication unit 25, and a microphone 26. Further, since the GNSS receiver 21, the GNSS antenna 21a, the arithmetic unit 22, the modulation / demodulation unit 24, the wireless communication unit 25, and the wireless communication antenna 25a have substantially the same configuration as the portion having the same name provided in the master unit 10, the description thereof is omitted. do. The microphone 26 detects the sound around the slave unit 20 and converts it into an electric signal (information). The electric signal output by the microphone 26 is modulated by the modulation / demodulation unit 24 and then transmitted to the outside via the wireless communication unit 25 and the wireless communication antenna 25a.

Next, with reference to FIGS. 4 to 7, communication between the master unit 10 and the slave unit 20 using the time slot will be specifically described. FIG. 4 is a flowchart showing a process of determining a time slot for transmitting master unit information. FIG. 5 is a diagram showing an example of the time slot allocation status. FIG. 6 is a diagram showing a difference in carrier sense setting between the slave unit 20 and the master unit 10. FIG. 7 shows the carrier sense of the master unit 10 (for example, the master unit 10A) that succeeded in transmitting the master unit information last time and the master unit 10 (for example, the master unit 10B) that failed to transmit the master unit information last time. It is a figure which shows the difference of setting.

First, wireless communication using a time slot will be described. In the mobile monitoring system 100, wireless communication is performed by the master unit 10 and the slave unit 20 by using the time division multiple access. In time division multiple access, a unit called a turn or frame is created by dividing the time at regular intervals (for example, every 5 seconds). Then, this turn is divided into a plurality of (for example, 10) to create a plurality of time slots. Each time slot is assigned to the master unit 10 and the slave unit 20. The master unit 10 and the slave unit 20 transmit information in the assigned time slot. For example, when a third time slot is assigned to a certain handset 20, the handset 20 transmits information in the third time slot in each turn. In this way, the cycle of the time slot becomes a turn.

Further, as described above, the master unit 10 and the slave unit 20 each include GNSS receivers 11 and 21, and can calculate a very accurate GNSS time. The start timing of each turn and the start timing of each time slot are determined based on this GNSS time. Therefore, the master unit 10 and the slave unit 20 can use turns and time slots that are synchronized very accurately.

Next, the specific allocation of time slots will be described. In the following description, as shown in FIG. 1, a mobile monitoring system 100 composed of two master units 10 and three slave units 20 will be described as an example. Further, when each terminal is described separately, the two master units 10 are distinguished by the reference numerals 10A and 10B, and the three slave units 20 are distinguished by the reference numerals 20A, 20B, and 20C. ..

As shown in FIG. 5, in this embodiment, one turn is divided into 10 time slots. FIG. 5 shows a table for three turns. In each table, the item described as SLn (n = 1 to 10) indicates the nth time slot. In addition, hatching or the like is attached to a portion corresponding to a terminal to which information transmission is assigned in each time slot.

In the present embodiment, the time slot SL1 of each turn is assigned to transmit the patrol signal of the master unit 10A or the master unit 10B. The patrol signal is a signal for transmitting information regarding settings in wireless communication by the mobile monitoring system 100. Specifically, the patrol signal includes, for example, information on a time slot already assigned (or not assigned and can be used) to the slave units 20A to 20C.

In the example shown in FIG. 5, the slave unit 20A is assigned the time slot SL2, the slave unit 20B is assigned the time slot SL3, and the slave unit 20C is assigned the time slot SL5. The slave units 20A to 20C transmit the slave unit information using the assigned time slot in each turn.

As described above, the patrol signals transmitted by the master units 10A and 10B and the slave unit information transmitted by the slave units 20A to 20C are transmitted in the time slots assigned in advance. On the other hand, the master unit information transmitted by the master units 10A and 10B is not assigned a time slot in advance. This is because when a time slot is assigned to the master unit information transmitted by the master units 10A and 10B, the time slot for allocating to the slave unit 20 is reduced accordingly. In the mobile monitoring system 100, a slave unit 20 may be added depending on the situation, and it is important to open a time slot in preparation for it. Further, the master unit information does not need to be transmitted more frequently than the slave unit information. This is because, in hunting using the mobile monitoring system 100, information such as the position of the hunting dog is important, and the moving speed of the hunter is slower than that of the hunting dog. This is because the approximate position of the hunter can be grasped.

In consideration of the above, in the present embodiment, the master unit 10 transmits the master unit information while giving priority to the transmission of the slave unit information by the slave unit 20. Specifically, each master unit 10 individually performs the processes shown in the flowchart of FIG. 4, and determines the time slot for transmitting the master unit information.

First, the master unit 10 determines whether or not the time slot setting information is stored (S101). For example, when the master unit 10 manages the allocation of time slots, the time slot assigned to the slave unit 20 can be specified only by reading this setting information. As an example of the setting information, information about the setting in which the slave unit 20 is assigned in the numerical order (time series order) of the time slot for each turn, or the setting in which the slave unit 20 is assigned to any different time slot. There is information about.

When the master unit 10 does not store the time slot setting information (No in S101), the master unit 10 reads out the time (timing) of the slave unit information received from the slave unit 20 in the past (S102). As described above, since the handset 20 transmits the handset information in the same time slot in each turn, the handset 20 is assigned to which time slot based on the time of the handset information received during at least one turn. I can guess if it is. Since it is possible that the handset information transmitted by the handset 20 cannot be received due to an obstacle or the like, it is more preferable to use the time of the handset information received during two or more turns.

Next, the master unit 10 specifies an empty time slot (S103). The empty time slot is a time slot that can be assigned to the slave unit 20 and is not actually assigned to the slave unit. Therefore, in FIG. 5, the time slot SL1 is not an empty time slot because it is assigned to the master units 10A and 10B and cannot be assigned to the slave unit 20. Further, the time slots SL2, SL3, and SL5 are not empty time slots because they are actually assigned to the slave units 20A to 20C. On the other hand, for example, in the first turn, the time slots SL6 and SL8 are used by the master units 10A and 10B for transmitting the master unit information, but can be assigned to the slave unit 20 and are actually assigned to the slave unit 20. Since there is no such thing, it corresponds to an empty time slot. Of course, other time slots that no terminal is sending information to are also free time slots.

Therefore, the master unit 10 can specify an empty time slot by using the time slot allocation status of the slave unit 20. Here, in the case of Yes in step S101, the allocation status of the time slot of the slave unit 20 can be grasped based on the time slot setting information. Further, in the case of No in step S101, the allocation status of the time slot of the slave unit 20 can be grasped based on the time when the slave unit information is received from the slave unit 20 in the past. In this way, the master unit 10 identifies an empty time slot.

Next, the master unit 10 uses the specified empty time slot to specify a transmission time slot, which is a time slot actually used for transmitting master unit information (S104). The master unit 10 transmits master unit information using the specified transmission time slot. As a result, the master unit information can be transmitted without hindering the transmission of the slave unit information by the slave unit 20.

However, if the master unit 10 does not know the addition of the slave unit 20 immediately after the slave unit 20 is added to the mobile monitoring system 100 as described above, the time slot is set between the master unit 10 and the slave unit 20. It is possible that you will suffer. Therefore, in order to prioritize the transmission of the slave unit information by the slave unit 20 over the transmission of the master unit information by the master unit 10, the master unit 10 and the slave unit 20 perform the following carrier sense.

Here, the carrier sense is a process of detecting another wireless communication over a predetermined time (hereinafter, carrier sense time) and determining whether or not to transmit information based on the detection result. Carrier sense is performed for each time slot in which information is transmitted. For example, when a radio wave having a level higher than the threshold value is detected on the same channel (frequency band) in the carrier sense time, information is not transmitted in order to avoid communication collision. On the other hand, when the above radio wave is not detected, the transmission of information is started. The arithmetic units 12 and 22 determine whether or not to start transmitting information.

In order to give priority to the slave unit 20 over the master unit 10, it is necessary that the carrier sense of the master unit 10 is continued even after the timing when the carrier sense of the slave unit 20 ends. In this case, since the master unit 10 detects the transmission of the slave unit information by the slave unit 20 in the carrier sense, even if the master unit 10 and the slave unit 20 are covered by the time slot, the slave unit is not the master unit 10 but the slave unit. Information will be transmitted by the machine 20. Specifically, as shown in pattern A of FIG. 6, the above is realized by making the carrier sense time of the master unit 10 longer than the carrier sense time of the slave unit 20 while making the start time of the carrier sense the same. can. Alternatively, as shown in pattern B of FIG. 6, by setting the start time of the carrier sense of the master unit 10 later than that of the slave unit 20, the above can be realized even if the carrier sense times of both units are the same. The pattern A and the pattern B may be combined to make the carrier sense time of the master unit 10 longer than that of the slave unit 20, and the carrier sense start time of the master unit 10 may be slower than that of the slave unit 20. Further, the master unit performs carrier sense, but the slave unit does not have to perform carrier sense.

Next, the control for avoiding the collision of the communication between the master units 10 will be described. As described above, since the plurality of master units 10 individually specify the empty time slot and the transmission time slot, when the same transmission time slot is specified between the master units 10, the communication between the master units 10 collides with each other. In order to prevent this, the master unit 10 performs at least one of the first collision prevention control and the second collision prevention control.

The first collision prevention control is a control for changing the number of turns from the transmission of the master unit information to the next transmission of the master unit information by the master unit 10. For example, in FIG. 5, since the master unit 10B transmits the master unit information in the first turn and the second turn, the transmission interval here is one turn. However, since the master unit 10B does not transmit the master unit information on the third turn, the transmission interval is two or more turns here. The number of turns in the transmission interval may be a different value each time, or the same number of turns may be continuous as long as it is about several times. Further, in order to further reduce the possibility of communication collision with the other master unit 10, it is more preferable to change the transmission interval at random. Further, although the first collision prevention control is effective even if it is performed only by one master unit 10, it is more preferable to perform it by a plurality of master units 10.

The second collision prevention control is a control for changing an empty time slot (transmission time slot) used for transmitting master unit information. If a plurality of master units 10 transmit the master unit information using the same time slot every turn, a communication collision between the master units 10 will occur every turn. In this respect, the above situation can be avoided by performing the second collision prevention control. For example, in FIG. 5, the master unit 10A uses the time slot SL8 on the first turn and uses the time slot SL9 on the third turn to transmit the master unit information. The transmission time slot used for transmitting the master unit information may have a different value each time (for each transmission), or the same transmission time slot may be used as long as it is about several times. Further, in order to further reduce the possibility of communication collision with the other master unit 10, it is more preferable to randomly change the transmission time slot used for transmitting the master unit information. Further, although the second collision prevention control is effective even if it is performed only by one master unit 10, it is more preferable to perform it by a plurality of master units 10.

Even when the above-mentioned collision prevention control is performed, the probability of a collision in communication between the master units 10 does not become zero. Therefore, in the present embodiment, in order to prevent the same master unit 10 from continuing to be unable to transmit the master unit information (that is, to prevent the frequency of transmission of the master unit information from becoming non-uniform for each master unit 10). Therefore, the master unit 10 further performs the following processing.

Specifically, if carrier sense is performed to detect the transmission of the master unit information by the other master unit 10 and the master unit information is not transmitted, the next time, the master unit information is transmitted by the master unit 10. It has priority over the other master units 10. Specifically, it is necessary that the carrier sense of the master unit 10 that succeeded in the previous transmission is continued even after the timing at which the carrier sense of the master unit 10 that failed in the previous transmission ends. Specifically, it is necessary to change the carrier sense time as shown in pattern A of FIG. 7, change the start time of carrier sense as shown in pattern B of FIG. 7, or both. Further, the carrier sense setting of the master unit 10 that succeeded in the previous transmission may be changed, or the carrier sense setting of the master unit 10 that failed in the previous transmission may be changed.

Even if the transmission fails last time, it is preferable to give priority to the transmission of the slave unit information of the slave unit 20 over the transmission of the master unit information of the master unit 10. Therefore, it is preferable that the carrier sense of the master unit 10 that failed in the previous transmission is continued even after the timing at which the carrier sense of the slave unit 20 ends.

As described above, the master unit 10 of the present embodiment includes a wireless communication unit 15 and a calculation unit 12. Further, the following mobile object monitoring method is performed using the master unit 10. The wireless communication unit 15 receives the handset information about the handset from at least one handset 20 attached to the hunting dog. The calculation unit 12 identifies an empty time slot that is a time slot that is not actually assigned to the slave unit 20 among the time slots that can be assigned to the slave unit 20, and the master unit information about the own unit in the empty time slot. Is transmitted to the wireless communication unit 15.

As a result, since the empty time slot is a time slot that can be assigned to the slave unit 20 after the fact, the slave unit is compared with the configuration in which the master unit information is transmitted in the time slot assigned in advance to the master unit 10. It is possible to secure a large number of time slots for allocating to 20.

Further, in the master unit 10 of the present embodiment, the calculation unit 12 identifies an empty time slot by specifying a time slot assigned to the slave unit 20 from the timing when the slave unit information is received from the slave unit 20.

This makes it possible to specify an empty time slot even when the master unit 10 does not know the time slot setting information.

Further, in the master unit 10 of the present embodiment, the arithmetic unit 12 specifies an empty time slot based on the setting regarding the allocation of the time slot to the slave unit 20.

This makes it possible to identify free time slots in a simple and reliable way.

Further, the master unit 10 of the present embodiment includes a GNSS receiver 11 that acquires the position of the own unit. The wireless communication unit 15 transmits the master unit information including the position acquired by the GNSS receiver 11.

As a result, the hunting dog can be monitored more appropriately by notifying the other master unit 10 of the position of the own unit.

Further, in the master unit 10 of the present embodiment, the calculation unit 12 performs carrier sense to detect other wireless communications over the carrier sense time and determine whether or not to transmit the master unit information.

This makes it possible to prevent a collision with communication with the slave unit 20 and other wireless devices.

Further, in the master unit 10 of the present embodiment, when the master unit 10 (calculation unit 12) and the slave unit 20 perform carrier sense in the same time slot, the master unit is continued even after the timing at which the carrier sense of the slave unit 20 ends. Ten career senses are continuing.

As a result, even when the master unit 10 tries to transmit the master unit information using the time slot assigned to the slave unit 20, the transmission of the slave unit information by the slave unit 20 can be prioritized.

Further, in the master unit 10 of the present embodiment, the calculation unit 12 changes at least one of the carrier sense start time and the carrier sense time, and fails to transmit the master unit information. Succeeded in sending and terminates earlier than the next carrier sense.

This makes it possible to avoid a situation in which only a part of the plurality of master units 10 cannot transmit the master unit information.

Further, the master unit 10 of the present embodiment includes a GNSS receiver 11 that calculates the GNSS time based on the positioning signal from the GNSS satellite 60. The time slot is determined based on the GNSS time.

As a result, the time slot is determined based on the highly accurate GNSS time, and accurate control becomes possible.

Further, in the master unit 10 of the present embodiment, the calculation unit 12 has a first collision prevention control for changing the number of turns from the transmission of the master unit information to the next transmission of the master unit information, and the master unit information. At least one of the second collision prevention control for changing the empty time slot used for transmission is performed.

As a result, it is possible to prevent the time slots for transmitting the master unit information from being continuously overlapped between the master units 10.

Although the preferred embodiment of the present invention has been described above, the above configuration can be changed as follows, for example.

In the above embodiment, the plurality of slave units 10 are used to acquire the slave unit information of the plurality of slave units 20 to monitor the plurality of mobile objects, but the slave unit 20 may be one.

In the above embodiment, the master unit 10 stores the time when the slave unit information is received from the slave unit 20 in the past, but instead of or in addition to this, at the time when the slave unit information is received from the slave unit 20. A free time slot may be constantly calculated based on the free time slot, and the free time slot may be stored.

In the above embodiment, the user of the master unit 10 is a hunter and the mobile body (where the slave unit 20 is attached) is a hunting dog, but the moving body may be a living body (other animal or human) other than the hunting dog. It may be a moving body other than a living body (for example, an automobile). In this case, the user of the master unit 10 is also a person other than the hunter.

10 Master unit (mobile monitoring device)
11 GNSS receiver (position acquisition unit)
12 Calculation unit 15 Wireless communication unit 20 Slave unit 100 Mobile monitoring system

Claims (12)

A wireless communication unit that receives handset information about the handset from at least one handset attached to the mobile body, and
Among the time slots that can be assigned to the slave unit, an empty time slot that is a time slot that is not actually assigned to the slave unit is specified, and the master unit information about the own unit is input to the wireless communication unit in the empty time slot. And the arithmetic unit to be sent to
Bei to give a,
The calculation unit performs carrier sense to detect other wireless communications over the carrier sense time and determine whether or not to transmit the master unit information.
When the arithmetic unit and the slave unit perform carrier sense in the same time slot, the mobile body is characterized in that the carrier sense of the arithmetic unit is continued even after the timing at which the carrier sense of the slave unit ends. Monitoring device. A wireless communication unit that receives handset information about the handset from at least one handset attached to the mobile body, and
Among the time slots that can be assigned to the slave unit, an empty time slot that is a time slot that is not actually assigned to the slave unit is specified, and the master unit information about the own unit is input to the wireless communication unit in the empty time slot. And the arithmetic unit to be sent to
Bei to give a,
When the cycle of the time slot is called a turn,
The calculation unit
The first collision prevention control that changes the number of turns from the transmission of the master unit information to the next transmission of the master unit information, and
A second collision prevention control that changes the empty time slot used for transmitting the master unit information, and
A mobile monitoring device characterized in that at least one of them is performed. The mobile monitoring device according to claim 1 or 2.
The calculation unit is a mobile monitoring device, characterized in that an empty time slot is specified by specifying a time slot assigned to the handset from the timing of receiving the handset information from the handset. The mobile monitoring device according to claim 1 or 2.
The calculation unit is a mobile monitoring device that identifies an empty time slot based on a setting relating to allocation of a time slot to the slave unit. The mobile monitoring device according to any one of claims 1 to 4.
Equipped with a position acquisition unit that acquires the position of the own machine,
The wireless communication unit is a mobile monitoring device characterized by transmitting the master unit information including the position acquired by the position acquisition unit. The mobile monitoring device according to claim 1.
The calculation unit changes at least one of the carrier sense start time and the carrier sense time, and fails to transmit the master unit information. The carrier sense to be performed next is successfully transmitted to the master unit information. A mobile monitoring device characterized by ending earlier than the sense. The mobile monitoring device according to any one of claims 1 to 6.
Equipped with a GNSS receiver that calculates the GNSS time based on the positioning signal from the GNSS satellite.
A mobile monitoring device characterized in that the time slot is determined based on the GNSS time. The mobile monitoring device according to any one of claims 1 to 7.
A mobile body monitoring device characterized in that the moving body is a living body. In a mobile monitoring system including at least one slave unit mounted on a mobile unit and a plurality of master units.
The handset wirelessly transmits handset information about the handset in the assigned time slot.
The master unit is
A calculation unit that identifies an empty time slot that is a time slot that is not actually assigned to the slave unit among the time slots that can be assigned to the slave unit.
A wireless communication unit that receives the slave unit information transmitted by the slave unit and transmits master unit information that is information about the master unit in the empty time slot specified by the calculation unit.
Bei to give a,
The calculation unit performs carrier sense to detect other wireless communications over the carrier sense time and determine whether or not to transmit the master unit information.
When the arithmetic unit and the slave unit perform carrier sense in the same time slot, the mobile body is characterized in that the carrier sense of the arithmetic unit is continued even after the timing at which the carrier sense of the slave unit ends. Monitoring system. In a mobile monitoring system including at least one slave unit mounted on a mobile unit and a plurality of master units.
The handset wirelessly transmits handset information about the handset in the assigned time slot.
The master unit is
A calculation unit that identifies an empty time slot that is a time slot that is not actually assigned to the slave unit among the time slots that can be assigned to the slave unit.
A wireless communication unit that receives the slave unit information transmitted by the slave unit and transmits master unit information that is information about the master unit in the empty time slot specified by the calculation unit.
Bei to give a,
When the cycle of the time slot is called a turn,
The calculation unit
The first collision prevention control that changes the number of turns from the transmission of the master unit information to the next transmission of the master unit information, and
A second collision prevention control that changes the empty time slot used for transmitting the master unit information, and
A mobile monitoring system characterized by performing at least one of these. In a mobile monitoring method using a master unit that acquires slave unit information about a slave unit from at least one slave unit mounted on the mobile unit.
The master unit is
The handset information is received by using the wireless communication unit, and the handset information is received.
Among the time slots that can be assigned to the slave unit, the empty time slot that is the time slot that is not actually assigned to the slave unit is specified.
In the empty time slot, the master unit information, which is information about the master unit, is transmitted by using the wireless communication unit.
The master unit performs carrier sense to detect other wireless communications over the carrier sense time and determine whether or not to transmit the master unit information.
When the master unit and the slave unit perform carrier sense in the same time slot, the mobile body is characterized in that the carrier sense of the master unit is continued even after the timing at which the carrier sense of the slave unit ends. Monitoring method. In a mobile monitoring method using a master unit that acquires slave unit information about a slave unit from at least one slave unit mounted on the mobile unit.
The master unit is
The handset information is received by using the wireless communication unit, and the handset information is received.
Among the time slots that can be assigned to the slave unit, the empty time slot that is the time slot that is not actually assigned to the slave unit is specified.
In the empty time slot, the master unit information, which is information about the master unit, is transmitted by using the wireless communication unit.
When the cycle of the time slot is called a turn,
The master unit is
The first collision prevention control that changes the number of turns from the transmission of the master unit information to the next transmission of the master unit information, and
A second collision prevention control that changes the empty time slot used for transmitting the master unit information, and
A mobile monitoring method characterized in that at least one of them is performed.

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