JP2018061126A - Mobile terminal device, sensor data transmission method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a load on a communication network to be used in transmitting sensor data to a server.SOLUTION: A mobile terminal device 1 includes: a storage section 14 for storing sensor data acquired by a sensor 13 and a position and time when the data is acquired; a short-range radio communication section 17 for receiving position information of an opposite terminal; a determination section 18 for determining whether sensor data is to be transmitted to the opposite terminal for each piece of sensor data by using position information of an own terminal, position information of the opposite terminal, and a residence position associated with an area including a position corresponding to the sensor data; and a transmission section 20 for transmitting sensor data and a position and time to a server 3. The short-range radio communication section 17 allows sensor data, etc., determined to be transmitted to be transmitted to the opposite terminal, and receiving sensor data, etc., transmitted from the opposite terminal. The storage section 14 stores sensor data, etc., received from the opposite terminal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mobile terminal device that acquires sensor data and transmits it to a server.

By sensing the temperature, humidity, degree of air pollution, frequency vacancy, etc. with a large number of sensors over a wide area, it can be used for weather forecasting, air pollution investigation, radio base station installation planning, and the like. However, the installation of a large number of sensors over a wide area has a problem that it is difficult to realize because the sensor installation and maintenance management require a great deal of cost. On the other hand, in recent years, many people carry mobile terminal devices such as smartphones, and mobile terminal devices such as navigation systems are mounted on mobile objects such as automobiles. By performing sensing using the sensor of such a terminal, wide area sensing can be performed at a relatively low cost. Such a sensing method is called, for example, participatory sensing or cloud sensing.
For example, Patent Document 1 describes a technique for anonymizing position information of a participant in sensing in a system that performs participatory sensing.

Japanese Patent Laying-Open No. 2015-200862

  In participatory sensing, for example, cellular communication such as LTE (Long Term Evolution) is often used as communication from a mobile terminal device having a sensor to a server that collects sensor data. In order to realize wide area sensing, when many mobile terminal devices transmit sensor data to a server, the load on a communication network such as cellular communication used for transmitting the sensor data increases. was there.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mobile terminal device and the like that can reduce the load on a communication network when sensor data is transmitted to a server.

In order to achieve the above object, a mobile terminal apparatus according to the present invention is a mobile terminal apparatus that performs wireless communication, a position acquisition unit that acquires a current position, a time acquisition unit that acquires a current time, and sensor data , A sensor unit that acquires the sensor data, a storage unit that stores the position acquired by the position acquisition unit and the time acquired by the time acquisition unit when acquiring the sensor data, and another mobile terminal A short-range wireless communication unit that receives position information related to other mobile terminal devices from the device by short-range wireless communication, and for each sensor data stored in the storage unit, position information related to the mobile terminal device and short-range wireless communication Using the position information related to the other mobile terminal device received by and the staying position associated with the area including the position corresponding to the sensor data. A determination unit for determining whether or not to transmit sensor data to another mobile terminal device, the sensor data stored by the storage unit, and the position and time corresponding to the sensor data to a server that collects the sensor data A short-distance wireless communication unit that is determined by the determination unit to transmit to another mobile terminal device, and a position and time corresponding to the sensor data. Is transmitted to other mobile terminal devices by short-range wireless communication, receives sensor data transmitted from other mobile terminal devices by short-range wireless communication, and the position and time corresponding to the sensor data, and the storage unit The sensor data received by the short-range wireless communication unit and the position and time corresponding to the sensor data are accumulated.
With such a configuration, the sensor data can be transmitted to the server after moving the sensor data between the mobile terminal devices, and the transmission target can be transmitted more than when the sensor data is transmitted from each mobile terminal device to the server. The amount of data can be reduced, and as a result, the load on the communication network used when transmitting sensor data to the server can be reduced.

The mobile terminal device according to the present invention further includes an aggregating unit that aggregates sensor data corresponding to the same area and the same period among the sensor data accumulated by the accumulating unit, and the transmitting unit is aggregated by the aggregating unit. The sensor data and the position and time corresponding to the sensor data may be transmitted to the server.
With such a configuration, it is possible to reduce the amount of data to be transmitted compared to the case where sensor data is transmitted to a server without being aggregated. As a result, a communication network used when transmitting sensor data to the server It becomes possible to further reduce the load.

In the mobile terminal device according to the present invention, the position information includes the current position, and the determination unit determines that the distance between the current position of the mobile terminal device and the stay position corresponding to the sensor data is different from the other mobile terminal devices. When the distance between the current position and the staying position is larger than the current position, the sensor data may be determined to be transmitted to another mobile terminal device.
With such a configuration, sensor data acquired in a certain area can be collected in a mobile terminal device close to the staying position corresponding to that area. As a result, sensor data acquired in the area can be centrally held by fewer mobile terminal devices, and the amount of data to be transmitted can be reduced.

Further, in the mobile terminal device according to the present invention, the position information includes a target position that is the position of the destination, and the determination unit determines that the distance between the target position of the mobile terminal device and the stay position corresponding to the sensor data is When the distance between the target position of the other mobile terminal device and the staying position is larger, the sensor data may be determined to be transmitted to the other mobile terminal device.
With such a configuration, sensor data acquired in a certain area can be collected in a mobile terminal apparatus having a target position close to the stay position corresponding to that area. As a result, sensor data acquired in the area can be centrally held by fewer mobile terminal devices, and the amount of data to be transmitted can be reduced.

Further, in the mobile terminal device according to the present invention, the position information includes the current position and the target position which is the position of the movement destination, and the determination unit includes the vector from the current position to the target position of the own mobile terminal apparatus and the self-movement. The angle between the current position of the terminal device and the vector from the current position of the other mobile terminal device to the target position and the vector from the current position of the other mobile terminal device to the target position If the angle is larger than the angle, the sensor data may be determined to be transmitted to another mobile terminal device.
With such a configuration, sensor data acquired in a certain area can be collected in a mobile terminal apparatus that is moving in a direction close to the staying position corresponding to that area. As a result, sensor data acquired in the area can be centrally held by fewer mobile terminal devices, and the amount of data to be transmitted can be reduced.

Further, in the mobile terminal device according to the present invention, the target position may be a destination position at the time when a predetermined time has elapsed from the current time point.
With such a configuration, it is possible to make a more accurate determination using the target position by appropriately setting a predetermined time.

  The sensor data transmission method according to the present invention is a sensor data transmission method processed in a mobile terminal apparatus that performs wireless communication, and includes a position acquisition step for acquiring a current position and a time acquisition step for acquiring a current time. Sensor data acquisition step for acquiring sensor data, sensor data acquired in the sensor data acquisition step, and the position acquired by the position acquisition step and the time acquired by the time acquisition step at the time of sensor data acquisition A first accumulation step for accumulation, a first reception step for receiving position information relating to another mobile terminal device from another mobile terminal device by short-range wireless communication, and the own mobile terminal for each accumulated sensor data Location information about the device and other mobile terminal devices received via near field communication Determining whether to transmit the sensor data to another mobile terminal device using the position information to be performed and the staying position associated with the area including the position corresponding to the sensor data; A first transmission step of transmitting the sensor data determined to be transmitted to the mobile terminal device and the position and time corresponding to the sensor data to another mobile terminal device by short-range wireless communication; A second receiving step for receiving sensor data transmitted by distance wireless communication, a position and time corresponding to the sensor data, a sensor data received in the second receiving step, a position corresponding to the sensor data, and A second accumulation step for accumulating time, accumulated sensor data, and a position and time corresponding to the sensor data, A server for collecting Nsadeta, in which and a second transmitting step of transmitting by different wireless communication with the short-range wireless communication.

  According to the mobile terminal device and the like according to the present invention, sensor data is transmitted and received between mobile terminal devices and then transmitted to the server, whereby the load on the communication network when transmitting to the server can be reduced.

Schematic diagram showing a configuration of a wireless communication system according to an embodiment of the present invention The block diagram which shows the structure of the mobile terminal device by the embodiment The block diagram which shows the structure of the server by the embodiment The flowchart which shows operation | movement of the mobile terminal device by the embodiment The flowchart which shows operation | movement of the mobile terminal device by the embodiment The flowchart which shows operation | movement of the mobile terminal device by the embodiment The flowchart which shows operation | movement of the mobile terminal device by the embodiment The flowchart which shows operation | movement of the mobile terminal device by the embodiment The figure for demonstrating the area in the embodiment The figure for demonstrating the period in the embodiment The figure which shows an example of the residence position corresponding to the area in the embodiment The figure which shows an example of the residence position corresponding to the area in the embodiment The figure for demonstrating the judgment of the system 3 in the embodiment The figure which shows an example of transmission / reception of the data in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of the positional relationship of the mobile terminal device in the embodiment The figure which shows an example of a structure of the computer system in the embodiment

  Hereinafter, mobile terminal devices and the like according to the present invention will be described using embodiments. In the following embodiments, components and steps denoted by the same reference numerals are the same or equivalent, and repetitive description may be omitted. The mobile terminal device according to the present embodiment acquires sensor data, transmits / receives sensor data between mobile terminal devices using short-range wireless communication, aggregates the sensor data, and then uploads the data to a server.

  FIG. 1 is a block diagram showing a configuration of a wireless communication system 100 according to the present embodiment. A radio communication system 100 according to the present embodiment includes a plurality of mobile terminal apparatuses 1-1, 1-2,..., 1-6 that perform radio communication, and a plurality of radio base stations 2-1, 2-2, 2- 3 and a server 3 for collecting sensor data. In addition, when not distinguishing each apparatus in particular, it shall describe as the mobile terminal device 1 and the wireless base station 2. The mobile terminal device 1 is a terminal that acquires sensor data in participatory sensing. For example, the mobile terminal device 1 may be a device carried by a person such as a smartphone, a tablet terminal, a mobile phone, a wearable terminal, a navigation system, A device mounted on a moving body such as an automobile, a train, and a drone (multi-copter), such as an in-vehicle device. As described later, the mobile terminal apparatus 1 can perform short-range wireless communication between the mobile terminal apparatuses 1 and can perform wireless communication with the wireless base station 2. The short-range wireless communication performed between the mobile terminal devices 1 is usually performed as a so-called passing communication without an operation of a user or the like. This Embodiment demonstrates the case where the communication which the mobile terminal device 1 performs via the wireless base station 2 is cellular communication. The cellular communication may be, for example, communication using a mobile phone such as LTE or W-CDMA (Wideband Code Division Multiple Access). The user of the mobile terminal device 1 may cause the mobile terminal device 1 to participate in participatory sensing, for example, as a volunteer or receiving some reward. The wireless base station 2 and the server 3 are connected via a wired or wireless network 50 so that they can communicate with each other. The network 50 may be, for example, the Internet, a public telephone line network, or another network. The number of mobile terminal devices 1 and radio base stations 2 is not limited.

  FIG. 2 is a block diagram showing the configuration of the mobile terminal device 1. In FIG. 2, the mobile terminal device 1 includes a position acquisition unit 11, a time acquisition unit 12, a sensor 13, a storage unit 14, a storage unit 15, a target position acquisition unit 16, and a short-range wireless communication unit 17. The determination unit 18, the aggregation unit 19, and the transmission unit 20 are provided.

  The position acquisition unit 11 acquires the current position. The position acquisition unit 11 may acquire the position using, for example, GPS (Global Positioning System), or may acquire the position using a nearest base station such as a mobile phone or a wireless LAN. When the mobile terminal device 1 is mounted on a vehicle or the like, the position acquisition unit 11 may acquire the current position using an autonomous navigation device such as a gyro, for example. The position acquired by the position acquisition unit 11 may be, for example, coordinates indicating latitude and longitude, or may be other coordinates. In addition, when the mobile terminal device 1 is mounted on a flying body such as a drone, the position acquisition unit 11 may acquire a three-dimensional position including altitude. The altitude may be acquired using, for example, GPS, or may be acquired using an altimeter, a distance meter that measures the distance to the ground surface, or the like.

  The time acquisition unit 12 acquires the current time. For example, the time acquisition unit 12 may acquire the time using a clock. Moreover, the time acquisition part 12 may acquire the date and time containing time. The date and time may include time and date. For example, the time acquisition unit 12 may acquire the date from the calendar unit.

  The sensor 13 acquires sensor data. The sensor data includes, for example, temperature, humidity, atmospheric pressure, carbon dioxide concentration, particulate matter (eg, PM2.5) concentration, pollen scattering status, environmental sound level (noise level), illuminance, and ultraviolet intensity. It may be a vacant frequency band or the like, or other data to be sensed. Accordingly, the sensor 13 detects a free frequency band by performing, for example, a thermometer, a hygrometer, a barometer, a carbon dioxide concentration meter, a suspended particle sensor, a pollen sensor, a sound sensor, an illuminance sensor, an ultraviolet sensor, and spectrum sensing. An empty frequency band detector or the like may be used. Note that the vacant frequency band detector may detect a frequency band in which radio communication is not performed, for example, by performing spectrum sensing and comparing the received power of the radio signal received at each frequency with a threshold value.

  The accumulating unit 14 accumulates in the storage unit 15 the sensor data acquired by the sensor 13 and the position acquired by the position acquiring unit 11 and the time acquired by the time acquiring unit 12 when the sensor data is acquired. The accumulation unit 14 preferably accumulates so that the correspondence between sensor data, position, and time can be understood during the accumulation. For example, the storage unit 14 may store the sensor data, the position when the sensor data is acquired, and the time when the sensor data is acquired in the storage unit 15 as a single piece of information. Further, the storage unit 14 stores the sensor data received by the short-range wireless communication unit 17 and the position and time corresponding to the sensor data in the storage unit 15. The accumulating unit 14 may accumulate the position acquired by the position acquiring unit 11 as it is, or may accumulate a position where a predetermined rounding process (fraction processing) has been performed on the position. The predetermined rounding process may be, for example, converting the position acquired by the position acquisition unit 11 into an area including the position (described later). In that case, the sensor data is stored in the storage unit 15 in association with the position that is the area. A rounding process may be similarly performed on the time. That is, the storage unit 14 may store the time acquired by the time acquisition unit 12 as it is, or may store the time by performing a predetermined rounding process on the time. The predetermined rounding process may be, for example, converting the time acquired by the time acquisition unit 12 into a period including the time (described later). In this case, the sensor data is accumulated in the storage unit 15 in association with the time that is the period.

  The storage unit 15 stores sensor data, a position where the sensor data is acquired, and a time when the sensor data is acquired. In general, the storage unit 15 stores a plurality of sensor data. The storage in the storage unit 15 may be temporary storage in a RAM or the like, or may be long-term storage. The storage unit 15 can be realized by a predetermined recording medium (for example, a semiconductor memory or a magnetic disk).

  The target position acquisition unit 16 acquires the target position of the mobile terminal device 1. For example, the target position acquisition unit 16 may acquire the target position by route search, or may acquire the target position using the past movement history of the mobile terminal device 1 and the latest movement history. When the mobile terminal device 1 has a route search device, or when a route search device such as a navigation system is mounted on a mobile body on which the mobile terminal device 1 is mounted, for example, the current position is determined by the route search device. The route may be specified by performing a route search from the destination to the destination (destination), and the destination position corresponding to the route may be acquired. The destination position is the position of the destination of the mobile terminal device 1 and may be, for example, the destination itself input by the user, or the destination at the time when a predetermined time has elapsed from the current time. It may be the position. In the latter case, for example, after a predetermined time (for example, 5 minutes or 10 minutes after the current time) in the searched route, the sensor data is periodically uploaded from the mobile terminal device 1 to the server 3. May be the time of the period.) The position may be the target position. For example, when a destination that arrives one hour after the current time point is set as a destination position, when a method 2 described later is used, a route close to the stay position corresponding to the sensor data is passed along the route. Nevertheless, it may be determined that the distance between the destination position as the destination and the staying position is large. In addition, if a staying position exists between the current position and the destination target position when making a determination using method 3 to be described later, the staying position corresponding to the sensor data is detoured and moved along a route on the way. Nevertheless, it may be determined that the angle between the vector from the current position to the target position and the vector from the current position to the stay position is small. In order to avoid such an inappropriate determination, it is preferable to set the position after a predetermined time not far from the current time as the target position. For example, when it is set that the position after a predetermined time from the current time is set as the target position, the target position acquisition unit 16 cannot acquire the position after the predetermined time (for example, after 10 minutes). The target position may be a position within a predetermined time from the current time (this time is more suitable as the time is closer). When the target position is acquired using the movement history, the current position acquired by the position acquisition unit 11 may be stored as a movement history in a recording medium (not shown). Then, the target position acquisition unit 16 identifies the previous movement history that matches the latest movement history (for example, the latest five-minute history) by pattern matching or the like, and determines the predetermined movement history from the location of the identified movement history. The target position may be acquired by reading the position of the movement history after a predetermined time. Here, the fact that the most recent movement history and the past movement history match may be that the similarity between the two is equal to or greater than a threshold value. Note that the target position acquisition unit 16 may not be able to acquire the target position. Specifically, when the route search is not performed or when there is no past movement history that matches the latest movement history, the target position acquisition unit 16 cannot acquire the target position.

  The short-range wireless communication unit 17 receives position information regarding another mobile terminal device 1 from another mobile terminal device 1 via the antenna 17a by short-range wireless communication. The short-range wireless communication is wireless communication performed at a short distance, and may be, for example, wireless communication using Wi-Fi Direct, Bluetooth (registered trademark) LE (Low Energy), LTE Direct, or the like. It is preferable that the short-range wireless communication can be performed ad hoc as passing communication. The antenna 17a is an antenna for near field communication. The short-range wireless communication unit 17 may transmit the position information of the mobile terminal device 1 to the other mobile terminal devices 1 via the antenna 17a by short-range wireless communication. The position information may include, for example, the current position, may include the target position, and may include the current position and the target position. Further, the short-range wireless communication unit 17 transmits the sensor data determined by the determination unit 18 to be transmitted to another mobile terminal device 1 and the position and time corresponding to the sensor data to other mobile terminals by the short-range wireless communication. It transmits to the terminal device 1 via the antenna 17a. The short-range wireless communication unit 17 receives sensor data transmitted from another mobile terminal device 1 by short-range wireless communication, and a position and time corresponding to the sensor data via the antenna 17a. As described above, the rounding process may also be performed on the position and time transmitted by the short-range wireless communication unit 17. That is, the short-range wireless communication unit 17 may transmit the position and time that have been rounded to the position and time stored in the storage unit 15 to other mobile terminal devices 1. Further, the sensor data received by the short-range wireless communication unit 17 from the other mobile terminal device 1 may be acquired by the mobile terminal device 1 that is the transmission source, or the mobile terminal device that is the transmission source. 1 may be received from another mobile terminal device 1. When the short-range wireless communication unit 17 transmits the sensor data and the corresponding position and time to another mobile terminal device 1 by short-range wireless communication, the transmitted sensor data, position, and time are: For example, it may be deleted from the storage unit 15 or may not be used in subsequent processing. The deletion process may be performed by the short-range wireless communication unit 17, for example.

For example, the short-range wireless communication unit 17 may perform short-range wireless communication with the mobile terminal device 1 when receiving a signal transmitted by broadcast from another mobile terminal device 1. In addition, when a signal transmitted by broadcast by the short-range wireless communication unit 17 is received by another mobile terminal device 1 and a reply to the signal is received, the short-range wireless communication unit 17 performs the reply. Short-distance wireless communication with the mobile terminal device 1 may be performed. As such, the signal transmitted by broadcast may include, for example, the address of the own mobile terminal device 1. Hereinafter, such a signal transmitted by broadcast is referred to as a “Hello packet”. Passing communication may be started by transmission / reception of the Hello packet.
Note that the short-range wireless communication unit 17 may or may not include a wireless communication device for performing communication. The short-range wireless communication unit 17 may be realized by hardware, or may be realized by software such as a driver that drives a communication device.

The determination unit 18 determines whether to transmit sensor data to another mobile terminal device 1 for each sensor data stored in the storage unit 15 by the storage unit 14. The determination unit 18 includes position information related to the own mobile terminal device 1-m, position information related to the other mobile terminal device 1-n received by short-range wireless communication, and a position corresponding to the sensor data to be determined. The determination shall be made using the stay position associated with the area. Here, in order to make it easy to distinguish the own mobile terminal device 1 from the other, it will be described as “own mobile terminal device 1-m” and “other mobile terminal device 1-n”. Further, the position corresponding to the sensor data is a position where the sensor data is acquired. Usually, the position is associated with the sensor data and stored in the storage unit 15. It is assumed that the space to be sensed by the sensor 13 (for example, the entire Japanese region) is divided into a plurality of areas C ₁ , C ₂ ,... As shown in FIG. Although FIG. 7A shows a case where each area has a square shape, each area may have, for example, a rectangular shape or other shapes. The shape of each area may be different for each area, or may be the same. Regardless of the shape of each area, the boundaries of each area should be known. For example, as shown in Figure 7A, when a position corresponding to the sensor data is (X1, Y1), the position (X1, Y1) will be included in the area _{C 1.} Further, it is assumed that a staying position corresponding to each area is set in advance in each area. For example, as shown in Figure 8A, the residence location of zones _{C S} SY _{(C S)} may be a centroid of the area _{C S.} Furthermore, dwell location SY _{(C S)} of the area _{C S} may be other positions in the area _{C S.} Further, as shown in Figure 8B, dwell location SY _{(C S)} of the area _{C S} may be a position outside the area _{C S.} Zone C _S dwell location SY (C _S) is a position where the sensor data obtained in the area C _S is set to set. Therefore, a position where more mobile terminal devices 1 can gather may be set as a staying position. Specifically, a station, a shopping mall, or the like may be set as the staying position. In addition, when the stay position of the area is determined by a predetermined rule (for example, the center of gravity, etc.), the stay position for each area may not be stored, but in other cases, the stay position is stored for each area. It is preferred that For example, information that associates an identifier of an area with a staying position of the area may be stored in the storage unit 15. For example, the determination unit 18 may have its own mobile terminal device 1-m (hereinafter may be referred to as “own terminal”) as another mobile terminal device 1-n (hereinafter referred to as “partner terminal”). )) And short-range wireless communication can be performed, and it is preferable to make the determination when position information is received from another mobile terminal apparatus 1-n. For example, when the determination unit 18 has a certain determination target sensor data, the other mobile terminal device 1-n is closer to the staying position corresponding to the determination target sensor data than the own mobile terminal device 1-m. Determines that the sensor data is to be transmitted, and when the other mobile terminal device 1-n is not closer to the staying position corresponding to the sensor data to be determined than the mobile terminal device 1-m, It may be determined that sensor data is not transmitted. By transmitting and receiving sensor data according to such a determination, sensor data can be centrally held in as few mobile terminal devices 1 as possible. Note that the staying position corresponding to the determination target sensor data is a staying position in an area including the position where the determination target sensor data is acquired. When the current position of the terminal is used for the determination, the determination unit 18 uses the position acquired by the position acquisition unit 11 as the current position. When the target position of the terminal is used for the determination, the determination unit 18 uses the target position acquired by the target position acquisition unit 16. Here, as an example of the determination by the determination unit 18, a determination using the current position (method 1), a determination using the target position (method 2), and a determination using the current position and the target position (method 3). And will be described.

Method 1 (judgment using current position)
In this case, the current position is included in the position information. The determination unit 18 determines that the distance between the current position of the mobile terminal device 1-m and the stay position corresponding to the sensor data to be determined is the current position of the other mobile terminal device 1-n and the stay position. When it is larger than the distance, it is determined that the sensor data to be determined is transmitted to the other mobile terminal apparatus 1-n, and the distance between the current position and the staying position of the own mobile terminal apparatus 1-m is determined to be another mobile terminal. If the distance between the current position and the staying position of the device 1-n is not greater than the distance, the sensor data to be determined may be determined not to be transmitted to another mobile terminal device 1-n. That is, the sensor data may be passed to the mobile terminal device 1 whose current position is close to the staying position. Note that the distance between the two positions may be the Euclidean distance, or the shortest distance along the movement path between the two positions (that is, the shortest movement path searched by the route search using the map). (Distance along).

Method 2 (judgment using target position)
In this case, the target position is included in the position information. The determination unit 18 determines that the distance between the target position of the mobile terminal device 1-m and the stay position corresponding to the sensor data to be determined is the distance between the target position of the other mobile terminal device 1-n and the stay position. When it is larger than the distance, it is determined that the sensor data to be determined is transmitted to the other mobile terminal device 1-n, and the distance between the target position and the staying position of the own mobile terminal device 1-m is determined to be another mobile terminal. When the distance between the target position of the device 1-n and the staying position is not larger, it may be determined that the determination target sensor data is not transmitted to the other mobile terminal device 1-n. That is, the sensor data may be passed to the mobile terminal device 1 whose target position is close to the staying position.

Method 3 (judgment using current position and target position)
In this case, the current position and the target position are included in the position information. The determination unit 18 uses the vector from the current position of the mobile terminal device 1-m to the target position of the mobile terminal device 1-m and the sensor data to be determined from the current position of the mobile terminal device 1-m. The angle with the vector to the corresponding staying position is such that the vector from the current position of the other mobile terminal apparatus 1-n to the target position of the other mobile terminal apparatus 1-n and the other mobile terminal apparatus 1-n When it is larger than the angle from the current position to the vector to the stay position, it is determined that the sensor data to be determined is to be transmitted to another mobile terminal apparatus 1-n, and from the current position of the own mobile terminal apparatus 1-m The angle between the vector to the target position and the vector from the current position of the mobile terminal device 1-m to the staying position is the vector from the current position of the other mobile terminal device 1-n to the target position, and other movements. Current position of terminal device 1-m If not greater than the angle between the vector to dwell positions from may determine not to transmit the sensor data decision object to another mobile terminal apparatus 1-n. That is, the sensor data may be passed to the mobile terminal device 1 that is moving in a direction closer to the direction from the current position toward the staying position.

Method 3 will be described with reference to FIG. The current position of the mobile terminal 1-m and pos (m), the desired position of the own mobile terminal 1-m and dest (m), stay the dwell position corresponding to the sensor data _{r i} determination target (r _i ). Further, the current position of the other mobile terminal apparatus 1-n is assumed to be pos (n), and the target position of the other mobile terminal apparatus 1-n is assumed to be dest (n). A vector from pos (m) to dest (m) is V _dest (m), and a vector from pos (m) to stay (r _i ) is V _stay (m, r _i ). Further, a vector from pos (n) to dest (n) is V _dest (n), and a vector from pos (n) to stay (r _i ) is V _stay (n, r _i ). In addition, an angle between the vector V _dest (m) and the vector V _stay (m, r _i ) is θ, and an angle between the vector V _dest (n) and the vector V _stay (n, r _i ) is θ. If “θ> θ”, then, as shown in FIG. 9, from the mobile terminal device 1-m existing in pos (m) to another mobile terminal device existing in pos (n). The sensor data r _i to be determined is passed to 1-n.

Note that, when the method 3 is determined, the determination unit 18 determines the vector V _dest (m) from the current position pos (m) of the terminal itself to the target position _dest (m) and the current position pos (m of the terminal itself. vector V _stay (m from) to dwell position stay _{(r i),} the cosine similarity cs _m and _{r i),} and the vector V from the current position pos (n) of the counterpart terminal to the target position dest (n) The cosine similarity cs _n between _dest (n) and the vector V _stay (n, r _i ) from the current position pos (n) of the counterpart terminal to the stay position stay (r _i ) is calculated and the angle is used. You may compare the magnitude | size of (theta) and angle (theta) '. The cosine similarity cs (V1, V2) between the vector V1 and the vector V2 is calculated as follows. Here, V1 · V2 is an inner product of the vector V1 and the vector V2. || V1 || is the size of the vector V1.
cs (V1, V2) = (V1 · V2) / (|| V1 |||| V2 ||)

Note that the smaller the angle (0 ° to 180 °) between the vectors V1 and V2, the greater the cosine similarity cs (V1, V2) of both vectors. Therefore, if sc _m <cs _n , the angle θ between the vector V _dest (m) and the vector V _stay (m, r _i ) is equal to the vector V _dest (n) and the vector V _stay (n, r _i ). It is larger than the angle θ ′ formed by Thus, the magnitude of the angle formed by the vectors can be determined by using the cosine similarity.

The aggregation unit 19 aggregates sensor data corresponding to the same area and the same period among the sensor data accumulated in the storage unit 15 by the accumulation unit 14. The aggregated sensor data is also stored in the storage unit 15. Further, data in which a plurality of sensor data is aggregated is also referred to as sensor data. It is assumed that the time is divided into a plurality of periods T ₀ , T ₁ ,... As shown in FIG. 7B, for example. The length of that one period is T _par . The sensor data corresponding to the same area and the same period is a plurality of sensor data sensed in the same area and the same period. That is, (the n is an integer of 2 or more.) N number sensor data _r i (i = 1, 2, ..., n) of present position _{p i} and time _{t i} corresponding to the sensor data _{r i} If for all i from 1 to n, p _i εC _S , t _i εT _S , the n sensor data r _i can be aggregated, and the same area C _S and the same period the sensor data corresponding to T _S. Aggregating a plurality of sensor data may be, for example, obtaining representative values of the plurality of sensor data. The representative value may be, for example, an average value, a median value (intermediate value), a maximum value, a minimum value, or the like. For example, the first sensor data _{r 1,} the first position (X11, Y11) and the first set of the time t11 corresponding to the first sensor data _{r 1,} and a second sensor data _{r 2} , when the second position (X12, Y12) and set the second time t12 corresponding to the second sensor data _{r 2} can be aggregation, aggregating unit 19, after aggregate sensor data r _ave = (R ₁ + r ₂ ) / 2, position after aggregation (X _ave , Y _ave ) = ((X11 + X12) / 2, (Y11 + Y12) / 2), and time after aggregation t _ave = (t11 + t12) / 2 And may be calculated. Here, a case where aggregation is performed by obtaining an average value is shown. Further, aggregating a plurality of sensor data may be, for example, performing a compression process on a plurality of sensor data. It is preferable that the sensor data aggregated by the aggregation unit 19 has a data amount that is smaller than the sensor data before aggregation. The aggregation unit 19 may perform the aggregation process before the sensor data is transmitted to the server 3. Therefore, for example, the aggregation unit 19 may aggregate the sensor data immediately before transmitting the sensor data to the server 3, or may aggregate the sensor data immediately after the sensor data is accumulated in the storage unit 15. . In the latter case, for example, sensor data may be aggregated before sensor data or the like is transmitted to another mobile terminal device 1. When aggregation is performed immediately after sensor data is accumulated, when aggregation is calculation of an average value, sensor data can be aggregated even when new sensor data is accumulated. For example, the total value and the number of aggregated sensor data may be stored in the storage unit 15 together with the average of the sensor data. On the other hand, when the aggregation is performed immediately after the sensor data is accumulated, when the aggregation is acquisition of the maximum value or the minimum value, only the sensor data after the aggregation may be stored in the storage unit 15. In addition, when the aggregation is acquisition of the median value, it is preferable that the sensor data is aggregated immediately before the sensor data is transmitted to the server 3. The aggregating unit 19 may aggregate the positions and times corresponding to the sensor data to be aggregated when the sensor data is aggregated. The aggregation regarding the position and the time may be, for example, obtaining a representative value in the same manner as the aggregation of the sensor data, or the area and the period corresponding to the position and the time It may be time. When the aggregation unit 19 aggregates a plurality of sensor data before aggregation, the plurality of sensor data before the aggregation may be deleted from, for example, the storage unit 15 or not used in subsequent processing. It may be like that. The deletion process may be performed by the aggregation unit 19, for example. When two or more types of sensor data are acquired by the sensor 13, the aggregation unit 19 may perform aggregation only for a plurality of sensor data of the same type.

  The transmission unit 20 transmits the sensor data accumulated by the accumulation unit 14 and the position and time corresponding to the sensor data to the server 3 via the antenna 20a. The transmission is performed by wireless communication different from short-range wireless communication. As described above, the wireless communication different from the short-range wireless communication may be cellular communication, for example. The antenna 20a is an antenna for wireless communication performed by the transmission unit 20. The sensor data to be transmitted may be sensor data aggregated by the aggregation unit 19. For example, the transmission unit 20 may periodically transmit sensor data to the server 3. The period may, for example, be constant or not. When transmitting the position and time corresponding to the sensor data to the server 3, the transmission unit 20 may convert the position into a zone and transmit it, or may convert the time into a period and transmit it. That is, the transmission unit 20 may transmit the position that is an area and the time that is a period to the server 3. If a position is converted to an area, it may be converted to an area that includes the position. When a certain time is converted into a period, it may be converted into a period including the time. It is assumed that sensor data to be transmitted by the transmission unit 20 does not include sensor data transmitted to another mobile terminal device 1 by short-range wireless communication or sensor data already transmitted to the server 3. When the sensor data is transmitted to the server 3, the transmitted sensor data may be deleted from the storage unit 15, for example. The deletion process may be performed by the transmission unit 20, for example.

  The transmission unit 20 may directly transmit sensor data or the like to the server 3 or may indirectly transmit it via another server or the like. Further, the transmission unit 20 may perform transmission using an address held in a recording medium (not shown) as a transmission destination, or an address received from another component or another server before transmission as a transmission destination. Transmission may be performed. Further, the transmission unit 20 may or may not include a transmission device for performing transmission. The transmission unit 20 may be realized by hardware, or may be realized by software such as a driver that drives the transmission device.

  The radio base station 2 is a base station that performs radio communication with the mobile terminal device 1. The radio base station 2 is connected to a network 50 such as the Internet, and can provide communication between the mobile terminal device 1 and the server 3. The radio base station 2 is a base station used in, for example, cellular communication, mobile phone communication, and the like, and since it is already known, its detailed description is omitted.

FIG. 3 is a block diagram showing the configuration of the server 3. In FIG. 3, the server 3 collects sensor data, and includes a communication unit 31, an accumulation unit 32, and a storage unit 33.
The communication unit 31 receives the sensor data transmitted from the mobile terminal device 1 and the corresponding position and time. The communication unit 31 may or may not include a wired or wireless communication device for performing communication. The communication unit 31 may be realized by hardware, or may be realized by software such as a driver that drives a communication device.

  The accumulation unit 32 accumulates the sensor data received by the communication unit 31 and the corresponding position and time in the storage unit 33. In addition, when accumulating sensor data etc., the accumulation | storage part 32 may accumulate | store and accumulate sensor data similarly to the aggregation part 19, or may accumulate | store without performing aggregation. The aggregation may also be performed, for example, by obtaining a representative value.

  The storage unit 33 stores sensor data and a position and time corresponding to the sensor data. Such information is accumulated by the accumulation unit 32. Using the sensor data stored in the storage unit 33, for example, a weather forecast, an air pollution survey, a radio base station installation plan, or the like may be performed. Therefore, for example, the server 3 may include an output unit that outputs information stored in the storage unit 33. The output may be, for example, transmission or display of information, printing, delivery to another component, or the like. The storage in the storage unit 33 may be temporary storage in a RAM or the like, or may be long-term storage. The storage unit 33 can be realized by a predetermined recording medium (for example, a semiconductor memory or a magnetic disk).

Next, the operation of the wireless communication system 100 will be described using the flowchart of FIG.
(Step S101) The sensor 13 determines whether to acquire sensor data. And when acquiring sensor data, it progresses to Step S102, and when that is not right, it progresses to Step S106. For example, the sensor 13 may periodically determine that sensor data is acquired.

  (Step S102) The sensor 13 acquires sensor data.

  (Step S103) The position acquisition unit 11 acquires the current position at that time.

  (Step S104) The time acquisition unit 12 acquires the current time at that time.

  (Step S105) The storage unit 14 stores the sensor data acquired in step S102, the position acquired in step S103, and the time acquired in step S104 in the storage unit 15. Then, the process returns to step S101. The storage unit 14 preferably stores the sensor data, the position, and the time in association with each other.

  (Step S106) The short-range wireless communication unit 17 determines whether to transmit a Hello packet. And when transmitting a Hello packet, it progresses to step S107, and when that is not right, it progresses to step S113. For example, the short-range wireless communication unit 17 may determine to periodically transmit a Hello packet. Further, the short-range wireless communication unit 17 determines that the Hello packet is not transmitted, for example, when there is no sensor data to be transmitted, for example, when all the sensor data is transmitted to the server 3 immediately before. Good.

  (Step S107) The short-range wireless communication unit 17 transmits a Hello packet. The Hello packet may be transmitted by broadcast as described above. When this Hello packet is received by another mobile terminal device 1, passing communication is started.

  (Step S108) The short-range wireless communication unit 17 determines whether or not position information has been received from the counterpart terminal that is the mobile terminal device 1 that has received the Hello packet. If position information is received, the process proceeds to step S109. If not, the process of step S108 is repeated until position information is received. If position information of the partner terminal is not received even after a predetermined time has elapsed since the transmission of the Hello packet, it may be determined that a timeout has occurred and the process may return to step S101.

  (Step S109) The short-range wireless communication unit 17 transmits the position information of the own terminal to the counterpart terminal that is the transmission source of the position information received in Step S108. If the position information received in step S108 includes both the current position and the target position, the short-range wireless communication unit 17 transmits position information including both the current position and the target position to the partner terminal. May be. The current position is the current position acquired by the position acquisition unit 11 at that time. The target position is the target position acquired by the target position acquisition unit 16 at that time. When the target position cannot be acquired by the target position acquisition unit 16, the short-range wireless communication unit 17 may transmit position information including the current position to the partner terminal without including the target position. In addition, when the target position is not included in the position information received in step S108 and the current position is included, the short-range wireless communication unit 17 transmits the position information including the current position to the partner terminal. May be.

  (Step S110) The short-range wireless communication unit 17 or the like performs a process of transmitting sensor data to the partner terminal. Details of this processing will be described later with reference to the flowchart of FIG.

  (Step S111) The short-range wireless communication unit 17 determines whether or not the partner terminal sensor data and the position and time corresponding to the sensor data have been received. If sensor data or the like of the partner terminal is received, the process proceeds to step S112. If not, the process of step S111 is repeated until sensor data or the like of the partner terminal is received. If the sensor data or the like of the counterpart terminal is not received even after a predetermined time has elapsed since the transmission of the location information of the own terminal, it may be determined that a timeout has occurred and the process may return to step S101. This is because if there is no sensor data or the like to be transmitted in the counterpart terminal, the sensor data or the like may not be transmitted from the counterpart terminal.

  (Step S112) The accumulation unit 14 accumulates the sensor data and the like received in step S111 in the storage unit 15. Then, the process returns to step S101.

  (Step S113) The short-range wireless communication unit 17 determines whether or not a Hello packet transmitted from another mobile terminal device 1 has been received. And when a Hello packet is received, it progresses to step S114, and when that is not right, it progresses to step S116. Note that the short-range wireless communication unit 17 does not need to receive a Hello packet, for example, when there is no sensor data to be transmitted, for example, when all the sensor data is transmitted to the server 3 immediately before. Further, the short-range wireless communication unit 17 may not receive the Hello packet transmitted from the mobile terminal device 1 that has just transmitted / received the sensor data for a predetermined period. Passing communication is started by reception of this Hello packet.

  (Step S114) The short-range wireless communication unit 17 transmits the position information of the own terminal to the counterpart terminal that is the transmission source of the Hello packet received in Step S113. The current position included in the position information is the current position acquired by the position acquisition unit 11 at that time. The target position included in the position information is the target position acquired by the target position acquisition unit 16 at that time. If the target position can be acquired by the target position acquisition unit 16 at that time, the short-range wireless communication unit 17 may transmit position information including the current position and the target position to the partner terminal. If the target position cannot be acquired by the target position acquisition unit 16 at that time, the short-range wireless communication unit 17 may transmit position information including the current position to the partner terminal without including the target position.

  (Step S115) The short-range wireless communication unit 17 determines whether or not position information has been received from the counterpart terminal that is the mobile terminal device 1 that has transmitted the Hello packet. If position information is received, the process proceeds to step S110. If not, the process of step S115 is repeated until position information is received. Note that if the position information of the partner terminal is not received even after a predetermined time has elapsed since the transmission of the position information of the own terminal, it may be determined that a timeout has occurred and the process may return to step S101.

  (Step S116) The transmission unit 20 determines whether to transmit sensor data or the like to the server 3. And when transmitting sensor data etc., it progresses to Step S117, and when that is not right, it returns to Step S101. Note that the transmission unit 20 may periodically determine to transmit sensor data or the like, for example. For example, the transmission unit 20 may determine to transmit sensor data or the like when the data amount or number of sensor data to be transmitted stored in the storage unit 15 exceeds a predetermined threshold. Good. Further, for example, when the transmission target sensor data or the like is not stored in the storage unit 15, the transmission unit 20 may not determine to transmit the sensor data or the like to the server 3.

  (Step S117) The aggregation unit 19 aggregates untransmitted sensor data stored in the storage unit 15. The aggregating unit 19 may perform an aggregation process on the position and time corresponding to the aggregated sensor data.

  (Step S <b> 118) The transmission unit 20 transmits the aggregated sensor data and the position and time corresponding to the sensor data to the server 3.

  (Step S119) The transmission unit 20 deletes the transmitted sensor data from the storage unit 15. Here, the transmitted sensor data may be considered as sensor data used for aggregation of the transmitted sensor data. The transmission unit 20 may also delete the position and time corresponding to the transmitted sensor data from the storage unit 15. Then, the process returns to step S101.

  In the flowchart of FIG. 4, when the Hello packet transmitted by the short-range wireless communication unit 17 is received by two or more partner terminals and the location information is transmitted from two or more partner terminals, the two or more The processing from step S108 to step S112 may be performed for each counterpart terminal. In addition, since sensor data or the like may be transmitted from the counterpart terminal during the sensor data transmission process (step S110), the process of step S110 and the process of step S111 are performed in parallel. Also good. Moreover, in the flowchart of FIG. 4, when transmitting a Hello packet, you may make it transmit the Hello packet containing the positional information on an own terminal. As such, by transmitting a Hello packet including position information, it is not necessary to transmit position information separately. In addition, the determination method used in the transmission process may be specified by the Hello packet. In this case, the mobile terminal device 1 that has received the Hello packet transmits position information according to the designated method. In such a case, for example, the mobile terminal device 1 that cannot acquire the target position does not perform processing according to reception of the Hello packet for the Hello packet that specifies the method 2 or the method 3. Also good. Further, the order of processing in the flowchart of FIG. 4 is an example, and the order of each step may be changed as long as the same result can be obtained. For example, the order of processing in steps S102 to S104 is not limited. In the flowchart of FIG. 4, the process is terminated by power-off or a process termination interrupt.

FIG. 5 is a flowchart showing details of the transmission process (step S110) in the flowchart of FIG.
(Step S201) The determination unit 18 determines whether or not the target position is included in both the position information received from the counterpart terminal and the position information transmitted by the own terminal. If the target position is included in both, the process proceeds to step S203. If not, the process proceeds to step S202.

  (Step S202) The determination unit 18 determines to use method 1 as the method X for determining whether to transmit sensor data.

  (Step S203) The determination unit 18 determines to use the method 2 or the method 3 as the method X for determining whether to transmit sensor data. Here, whether to use method 2 or method 3 may be manually set in advance.

  (Step S204) The determination unit 18 sets the counter i to 1.

  (Step S <b> 205) The determination unit 18 determines whether or not the i-th sensor data to be determined is stored in the storage unit 15. If the i-th sensor data to be determined is stored in the storage unit 15, the process proceeds to step S206, and if not, the process proceeds to step S208.

  (Step S206) The determination unit 18 performs determination based on the method X determined in step S202 or step S203. Details of this processing will be described later with reference to the flowcharts of FIGS. 6A to 6C.

  (Step S207) The determination unit 18 increments the counter i by 1. Then, the process returns to step S205.

  (Step S208) The short-range wireless communication unit 17 transmits the sensor data determined to be a transmission target by the determination unit 18 and the position and time corresponding to the sensor data to the counterpart terminal. When there is no sensor data determined to be a transmission target by the determination unit 18, the short-range wireless communication unit 17 does not have to transmit to the partner terminal, or sensor data to be transmitted You may transmit to the other party terminal that there is no.

  (Step S209) The short-range wireless communication unit 17 deletes the transmitted sensor data from the storage unit 15. The short-range wireless communication unit 17 may also delete the position and time corresponding to the transmitted sensor data from the storage unit 15. And it returns to the flowchart of FIG.

FIG. 6A is a flowchart showing details of determination by method 1 (step S206) in the flowchart of FIG.
(Step S301) determining section 18, from the current position pos (m) of the terminal calculates the distance _{d m} to dwell position stay _{(r i)} corresponding to the i-th sensor data _{r i} determination target.

(Step S302) determining unit 18 calculates the distance _{d n} from the current position pos (n) of the counterpart terminal, to dwell locations stay corresponding to the i-th sensor data _{r i} determination target _{(r i).}

(Step S303) determining unit ₁₈ determines whether or not _d n <d _{m. When} a d n _{<d m,} the process proceeds to step S304, in the case of _{d n} ≧ _{d m,} the process returns to the flowchart of FIG.

(Step S304) The determination unit 18 sets the i-th sensor data r _i as sensor data to be transmitted. This setting may be performed, for example, by accumulating the i-th sensor data r _i and the position and time corresponding to the sensor data r _i in the transmission buffer. And it returns to the flowchart of FIG.

FIG. 6B is a flowchart showing details of the determination (step S206) according to method 2 in the flowchart of FIG.
(Step S401) determining section 18, the target position dest of the terminal (m), calculates the distance _{d m} to dwell position stay _{(r i)} corresponding to the i-th sensor data _{r i} determination target.

(Step S402) determining unit 18 calculates the distance _{d n} from the target position of the counterpart terminal dest (n), to dwell locations stay corresponding to the i-th sensor data _{r i} determination target _{(r i).}

(Step S403) determining unit ₁₈ determines whether or not _d n <d _{m. When} a d n _{<d m,} the process proceeds to step S404, in the case of _{d n} ≧ _{d m,} the process returns to the flowchart of FIG.

(Step S404) The determination unit 18 sets the i-th sensor data r _i as sensor data to be transmitted. This setting may be performed, for example, by accumulating the i-th sensor data r _i and the position and time corresponding to the sensor data r _i in the transmission buffer. And it returns to the flowchart of FIG.

FIG. 6C is a flowchart showing details of the determination by method 3 (step S206) in the flowchart of FIG.
(Step S <b> 501) The determination unit 18 determines whether the cosine similarity related to the own terminal and the cosine similarity related to the counterpart terminal can be calculated. If both cosine similarities can be calculated, the process proceeds to step S502. Otherwise, the process returns to the flowchart of FIG. When the current position pos (m) of the own terminal matches the target position dest (m) of the own terminal, or the current position pos (m) of the own terminal corresponds to the i-th sensor data r _i to be determined. In the case where it coincides with the stay position stay (r _i ) to be determined, the determination unit 18 may determine that the cosine similarity regarding the terminal itself cannot be calculated. Further, when the current position pos (n) of the counterpart terminal matches the target position dest (n) of the counterpart terminal, or the current position pos (n) of the counterpart terminal corresponds to the i-th sensor data r _i to be determined. If it matches the staying position stay (r _i ), the determination unit 18 may determine that the cosine similarity regarding the counterpart terminal cannot be calculated.

(Step S502) The determination unit 18 determines the vector V _dest (m) from the current position pos (m) of the terminal itself to the target position dest (m), and the stay position stay (r) from the current position pos (m) of the terminal itself. vector V _stay (m up to _i), and calculates the cosine similarity cs _m and _{r i).}

(Step S503) The determination unit 18 determines the vector V _dest (n) from the current position pos (n) of the counterpart terminal to the destination position dest (n) and the stay position stay (r) from the current position pos (n) of the counterpart terminal. vector V _stay (n up to _i), and calculates the cosine similarity cs _n with _{r i).}

(Step S504) The determination unit 18 determines whether cs _n > cs _m . If cs _n > cs _m , the process proceeds to step S505. If cs _n ≤cs _m , the process returns to the flowchart of FIG. Note that the case where cs _n > cs _m means that the angle θ formed by the vector V _dest (m) and the vector V _stay (m, r _i ) is the vector V _dest (n) and the vector V _stay (n, r _This is the case when the angle θ ′ formed with _i ) is larger.

(Step S505) The determination unit 18 sets the i-th sensor data r _i as sensor data to be transmitted. This setting may be performed, for example, by accumulating the i-th sensor data r _i and the position and time corresponding to the sensor data r _i in the transmission buffer. And it returns to the flowchart of FIG.

  In the flowchart of FIG. 5, when the determination unit 18 determines Yes in step S201, the determination unit 18 performs the determination process of step S501. When the determination unit 18 determines Yes in step S501, the determination unit 18 determines whether to transmit sensor data. When it is determined that the method 3 is used as the method X and it is determined No in step S501, it may be determined that the method 2 is used as the method X for determining whether to transmit the sensor data. In that case, the process of step S501 may not be performed in the flowchart of FIG. 6C.

  Next, the operation of radio communication system 100 according to the present embodiment will be described using a specific example. In this specific example, in order to simplify the description, a case where determination is made by the method 1 will be described. Further, in this specific example, the center of gravity of each zone is assumed to be the staying position.

First, a case where sensor data is transmitted and received by short-range wireless communication in a certain area will be described with reference to FIGS. 10, 11A, and 11B. As shown in FIG. 11A, the mobile terminal 1-1 becomes a timing of acquiring the sensor data when present in the area _{C 1,} and sensor data _{r 1} is acquired by the sensor 13 (step S101, S102, S601 ). Thereafter, it is assumed that the position (X101, Y101) at that time is acquired by the position acquisition unit 11, and the time t101 at that time is acquired by the time acquisition unit 12 (steps S103, S104). The acquired information is stored in the storage unit 15 by the storage unit 14 (step S105). Similarly, when the next timing for acquiring sensor data is reached, the sensor data r ₂ , position (X102, Y102), and time t102 are acquired and stored in the storage unit 15 (step S101). To S105, S602). Similarly, in the mobile terminal apparatus 12 existing in the area _{C 1,} the sensor data _{r 3,} position (X201, Y201), time t201 is accumulated is acquired, the sensor data _{r 4,} position (X202, Y202 ), The time t202 is acquired and stored (steps S101 to S105, S701, S702).

  Thereafter, it is assumed that the short-range wireless communication unit 17 of the mobile terminal device 1-1 determines that it is time to transmit the Hello packet, and transmits the Hello packet (steps S106, S107, and S603). At that time, it is assumed that the mobile terminal device 1-2 is within the communication range of the short-distance wireless communication of the mobile terminal device 1-1. Then, the short-range wireless communication unit 17 of the mobile terminal apparatus 1-2 receives the Hello packet transmitted from the mobile terminal apparatus 1-1 (step S113), and acquires the current position that is the current position. The position information including the current position (X203, Y203) received from the position acquisition unit 11 is transmitted to the mobile terminal device 1-1 that is the transmission source of the Hello packet (steps S114 and S703). . The location information transmitted from the mobile terminal device 1-2 is received by the short-range wireless communication unit 17 of the mobile terminal device 1-1 and passed to the determination unit 18 (step S108). Since the location information from the counterpart terminal has been received, the short-range wireless communication unit 17 of the mobile terminal device 1-1 instructs the location acquisition unit 11 to acquire the current location, which is the current location, and the location acquisition unit accordingly. 11 transmits the position information including the current position (X103, Y103) received from 11 to the mobile terminal device 1-2 that is the transmission source of the position information (steps S109 and S604). The location information transmitted from the mobile terminal device 1-1 is received by the short-range wireless communication unit 17 of the mobile terminal device 1-2 and passed to the determination unit 18 (step S115). Thereafter, transmission determination is performed in each of the mobile terminal apparatuses 1-1 and 1-2 (steps S110, S605, and S704). In this case, since the transmission judgment in both apparatuses is the same, here, the transmission judgment in the mobile terminal apparatus 1-2 will be described.

Determination unit 18 of the mobile terminal apparatus 12, first, the 1 th sensor data _{r 3,} a determination is made by the method 1 (step S201, S202, S204 to S206). Specifically, the determination unit 18, the current position of the terminal (X203, Y203), the distance _{d m} to dwell locations stay corresponding to sensor data _{r 3 (r 3) (=} SY (C 1)) Calculate (step S301). Here, the determination unit 18, by the position corresponding to the sensor data _{r 3} (X201, Y201) area containing the found identifying that the region _{C 1,} to identify the dwell position in the region _{C 1,} sensor The stay position stay (r ₃ ) corresponding to the data r ₃ can be specified. Since the sensor data r ₃ is acquired in the area C ₁ , the staying position stay (r ₃ ) is the center of gravity of the area C ₁ . Further, the determination unit 18 calculates the distance _{d n} from the current position of the counterpart terminal (X103, Y103), to dwell locations stay corresponding to sensor data _{r 3 (r 3)} (step S302). _Here, a d n _{<d m,} more mobile terminals 1-1, and was close to the area _{C 1} of the dwell position SY _{(C 1)} than the mobile terminal device 1-2 (step S303). Then, the determination unit 18 adds the sensor data r ₃ , position (X201, Y201), and time t201 stored in the storage unit 15 to the transmission buffer of the short-range wireless communication unit 17 (step S304). Determination unit 18 of the mobile terminal apparatus 12, similarly, also make decisions about the sensor data _{r 4} (step S207, S205, S206), and adds the transmission buffer that sensor data _{r 4,} etc. (step S301~ S304). Thereafter, the short-range wireless communication unit 17 of the mobile terminal device 1-2 reads the sensor data and the like stored in the transmission buffer, and transmits the data to the mobile terminal device 1-1 by short-range wireless communication (steps S208 and S705). ), transmitted sensor data _{r 3,} position (X201, Y201), and the time t201, the sensor data _{r 4,} position (X202, Y202), to remove the time t202 from the storage unit 15 (step S209). Note that the same determination is also performed in the mobile terminal device 1-1, and it is determined that the sensor data r ₁ , r _{2 and the} like are not transmitted, and the mobile terminal device 1-1 is transferred to the mobile terminal device 1-2. The sensor data and the like are not transmitted.

Sensor data and the like transmitted from the mobile terminal device 1-2 are received by the short-range wireless communication unit 17 of the mobile terminal device 1-1 and accumulated in the storage unit 15 (steps S111 and S112). As a result, as shown in FIG. 11B, the mobile terminal device 1-1 holds the sensor data r _{1 to} r ₄ . As described above, when the mobile terminal device 1-1 holds the sensor data r _{1 to} r ₄ , it is assumed that the transmission unit 20 determines that it is time to transmit the sensor data and the like to the server 3 (steps). S116). Then, the transmission unit 20 instructs to collect the sensor data stored in the storage unit 15 at that time. When receiving the instruction, the aggregating unit 19 reads out the sensor data r _{1 to} r ₄ and the corresponding positions and times from the storage unit 15 and performs aggregation for the same area and the same period. Here, all positions are included in the area C _1, all the time is to have been included in the period T _1. Then, the aggregating unit 19, the sensor data _r 1 ~r _4, the position and time corresponding to them, the average r _ave of the sensor data _{r 1 ~r 4 (= (r} 1 + r 2 + r 3 + r 4) / and 4) aggregate on the position (area) _{C 1} and time (period) _{T 1,} and passes to the transmitter 20 (step S117, S606). Then, the transmission unit 20 transmits the collected sensor data r _ave , position C ₁ , and time T ₁ to the server 3 (steps S118 and S607). Further, the transmission unit 20 deletes each sensor data before aggregation and the position and time corresponding to each sensor data from the storage unit 15 (step S119). As a result, there is no stored sensor data or the like in the storage unit 15 of the mobile terminal device 1-1. Even if the transmission unit 20 of the mobile terminal device 1-2 determines that it is time to transmit sensor data or the like to the server 3, the storage unit 15 of the mobile terminal device 1-2 stores the sensor data or the like to be transmitted. Since it is not stored, transmission of sensor data or the like to the server 3 is not performed.

Sensor data and the like transmitted from the mobile terminal device 1-1 are received by the communication unit 31 of the server 3 and passed to the storage unit 32. The accumulation unit 32 accumulates the sensor data received from the communication unit 31 in the storage unit 33 (step S801). If sensor data corresponding to the position C ₁ and time T ₁ has already been stored so far, the storage unit 32 stores the sensor data stored so far, the newly received sensor data, May be accumulated and overwritten, or newly received sensor data may be accumulated separately.

  Next, another specific example in which sensor data and the like are transmitted and received between the mobile terminal devices 1 will be described with reference to FIGS. 12A to 12D. In this specific example, detailed description regarding acquisition, transmission, reception, and the like of sensor data is omitted.

As shown in Figure 12A, when the mobile terminal device 1-3, 1-4 is present in the area _{C 2,} in the mobile terminal device 1-3, the position and the time the sensor data _{r 5} is acquired, the mobile in the terminal device 1-4, and the location and time and sensor data r ₆ is acquired. Thereafter, as shown in FIG. 12B, when the mobile terminal devices 1-3 and 1-4 leave the area C ₂ , the mobile terminal device 1-1 enters the short-range wireless communication range of the mobile terminal device 1-3. 5, and the mobile terminal device 1-6 comes to exist in the communication area of the short-distance wireless communication of the mobile terminal device 1-4. Also, from the mobile terminal device 1-3, close to the dwell position better the area _{C 2} of the mobile terminal device 1-5 SY _{(C 2),} than the mobile terminal device 1-4, is better for the mobile terminal device 1-6 It is assumed that it is close to the staying position SY (C ₂ ) in the area C ₂ . Then, the sensor data r _{5 and the} like are transmitted from the mobile terminal device 1-3 to the mobile terminal device 1-5 by short-range wireless communication, and the sensor data r ₆ is transmitted from the mobile terminal device 1-4 to the mobile terminal device 1-6. Etc. are transmitted by short-range wireless communication. Then, as shown in FIG. 12C, it is assumed that the mobile terminal device 1-5 moves to the vicinity of the mobile terminal device 1-6, and both devices can perform short-range wireless communication. Also, from the mobile terminal device 1-5, more of the mobile terminals 1-6 and was close to the residence location of zones _{C 2} SY _{(C 2).} Then, the sensor data r _{5 and the} like are transmitted from the mobile terminal device 1-5 to the mobile terminal device 1-6 by short-range wireless communication. Accordingly, the mobile terminal device 1-6, so to retain the sensor data _r 5, _{r 6,} and the like. Thereafter, as shown in Figure 12D, after the mobile terminal 1-6 has moved to the area C _2, in the mobile terminal device 1-6, it is determined that it is time to transmit the sensor data and the like to the server 3 Then, after the sensor data r ₅ , r _6, etc. are collected, they are transmitted from the mobile terminal device 1-6 to the server 3 and accumulated in the server 3.

  As described above, according to the wireless communication system 100 according to the present embodiment, sensor data or the like can be transmitted to the server 3 after the sensor data or the like is moved between the mobile terminal devices 1. Therefore, the amount of data to be transmitted can be reduced as compared with the case where sensor data and the like are individually transmitted from each mobile terminal device 1 to the server 3. This is because the number of mobile terminal devices 1 that transmit sensor data or the like to the server 3 can usually be reduced by moving sensor data or the like between the mobile terminal devices 1. In particular, the amount of data can be efficiently reduced by collecting the sensor data and the like before transmitting the sensor data and the like to the server 3. Thus, by reducing the amount of data transmitted to the server 3, it is possible to reduce the load on the communication network used for communication to the server 3. In addition, using the position information of the own terminal, the position information of the counterpart terminal, and the stay position, the mobile terminal device 1 whose current position or target position is close to the stay position, or the direction of movement is in the direction toward the stay position By making sensor data gather in the nearby mobile terminal device 1, sensor data acquired in a certain area can be gathered in the vicinity of the staying position in that area. As a result, the data to be aggregated can be easily concentrated on the specific mobile terminal device 1, and the aggregation effect can be further enhanced. In addition, by automatically performing transmission / reception of sensor data and the like between the mobile terminal devices 1 by passing communication, the transmission / reception does not have to be performed by the user's operation, and the mobile terminal is not burdened. Movement of sensor data or the like between the devices 1 can be realized.

  In the present embodiment, a case has been described in which one of methods 1 to 3 is selected as a method for determining whether or not to transmit sensor data or the like to the counterpart terminal by short-range wireless communication. Good. Any of the methods 1 to 3 may be set in advance as a determination method. Further, when the method 2 is set in advance as the determination method and the target position cannot be acquired by the target position acquisition unit 16, the determination unit 18 may use the current position as the target position. Good.

  Moreover, although this Embodiment demonstrated the case where aggregation was performed in order to upload sensor data etc. to the server 3, it may not be so. Sensor data or the like may be transmitted to the server 3 without performing aggregation. Even in that case, the amount of data to be transmitted can be reduced as compared with the case where sensor data and the like are transmitted from the separate mobile terminal devices 1 to the server 3. This is because the amount of data to be transmitted is usually smaller when N sensor data is transmitted from one device than when N sensor data is transmitted from N devices in consideration of overhead and the like. .

  Moreover, although the case where the mobile terminal device 1 according to the present embodiment includes the target position acquisition unit 16 that acquires the target position has been described, this need not be the case. For example, when only the determination based on the method 1 is performed, the mobile terminal device 1 may not include the target position acquisition unit 16.

  In the above embodiment, each process or each function may be realized by centralized processing by a single device or a single system, or may be distributedly processed by a plurality of devices or a plurality of systems. It may be realized by doing.

  In the above embodiment, the information exchange between the components is performed by one component when, for example, the two components that exchange the information are physically different from each other. It may be performed by outputting information and receiving information by the other component, or when two components that exchange information are physically the same, one component May be performed by moving from the phase of the process corresponding to to the phase of the process corresponding to the other component.

  In the above embodiment, information related to processing executed by each component, for example, information received, acquired, selected, generated, transmitted, or received by each component In addition, information such as threshold values, mathematical formulas, addresses, and the like used by each constituent element in processing may be temporarily or for a long time held in a recording medium (not shown), even if not specified in the above description. Further, the storage of information on the recording medium (not shown) may be performed by each component or a storage unit (not shown). Further, reading of information from the recording medium (not shown) may be performed by each component or a reading unit (not shown).

  In the above embodiment, when information used by each component, for example, information such as a threshold value, an address, and various setting values used by each component may be changed by the user, Even if it is not specified in the description, the user may be able to change the information as appropriate, or may not be so. If the information can be changed by the user, the change is realized by, for example, a not-shown receiving unit that receives a change instruction from the user and a changing unit (not shown) that changes the information in accordance with the change instruction. May be. The change instruction received by the receiving unit (not shown) may be received from an input device, information received via a communication line, or information read from a predetermined recording medium, for example. .

  In the above embodiment, when two or more components included in the mobile terminal device 1 have communication devices, input devices, or the like, the two or more components may have a physically single device. Well, or you may have separate devices.

  In the above-described embodiment, each component may be configured by dedicated hardware, or a component that can be realized by software may be realized by executing a program. For example, each component can be realized by a program execution unit such as a CPU reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory. At the time of execution, the program execution unit may execute the program while accessing the storage unit or the recording medium. In addition, the software which implement | achieves the mobile terminal device 1 in the said embodiment is the following programs. That is, this program is a program for causing a computer to function as a mobile terminal device that performs wireless communication, and the sensor data acquired by a sensor that acquires sensor data and the current position at the time of acquisition of the sensor data. An accumulator that accumulates the position acquired by the position acquisition unit to acquire and the time acquired by the time acquisition unit that acquires the current time, and the position information related to the other mobile terminal devices from a short distance from other mobile terminal devices For each sensor data accumulated by the short-range wireless communication unit and the storage unit received by wireless communication, position information regarding the own mobile terminal device, position information regarding other mobile terminal devices received by short-range wireless communication, Using the dwell position associated with the area containing the position corresponding to the sensor data, A determination unit that determines whether or not to transmit to a mobile terminal device, sensor data stored by the storage unit, and a position and time corresponding to the sensor data to a server that collects the sensor data, which is different from short-range wireless communication The short-range wireless communication unit causes the sensor data determined by the determination unit to transmit to another mobile terminal device, and the position and time corresponding to the sensor data by short-range wireless communication. Sensor data transmitted to other mobile terminal devices and transmitted from other mobile terminal devices by short-range wireless communication, and the position and time corresponding to the sensor data are received, and the storage unit is received by the short-range wireless communication unit This is a program for accumulating received sensor data and a position and time corresponding to the sensor data.

  In the program, the functions realized by the program do not include functions that can be realized only by hardware. For example, functions that can be realized only by hardware such as a modem and an interface card in a communication unit that communicates information, a transmission unit that transmits information, and the like are not included in at least the functions realized by the program.

  Further, this program may be executed by being downloaded from a server or the like, and a program recorded on a predetermined recording medium (for example, an optical disk such as a CD-ROM, a magnetic disk, a semiconductor memory, or the like) is read out. May be executed by Further, this program may be used as a program constituting a program product.

  Further, the computer that executes this program may be singular or plural. That is, centralized processing may be performed, or distributed processing may be performed.

  FIG. 13 is a diagram illustrating an example of a computer system 900 that executes the program and realizes the mobile terminal device 1 according to the embodiment. The above-described embodiment can be realized by computer hardware and a computer program executed on the computer hardware.

  In FIG. 13, a computer system 900 is connected to an MPU (Micro Processing Unit) 911, a ROM 912 such as a flash memory in which a program such as a bootup program, an application program, a system program, and data are stored, and an MPU 911. A RAM 913 that temporarily stores application program instructions and provides a temporary storage space, a touch panel 914, a wireless communication module 915, and a bus 916 that interconnects the MPU 911, the ROM 912, and the like are provided.

  A program that causes the computer system 900 to execute the functions of the mobile terminal device 1 according to the above-described embodiment may be stored in the ROM 912 via the wireless communication module 915. The program is loaded into the RAM 913 when executed. Note that the program may be loaded directly from the network.

  The program does not necessarily include an operating system (OS) or a third-party program that causes the computer system 900 to execute the functions of the mobile terminal device 1 according to the above-described embodiment. The program may include only a part of an instruction that calls an appropriate function or module in a controlled manner and obtains a desired result. How the computer system 900 operates is well known and will not be described in detail.

  Further, the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that these are also included in the scope of the present invention.

  As described above, according to the mobile terminal device and the like according to the present invention, it is possible to reduce the load on the communication network used when transmitting sensor data to the server, and it is useful as a device that performs participatory sensing. It is.

DESCRIPTION OF SYMBOLS 1 Mobile terminal device 2 Wireless base station 3 Server 11 Position acquisition part 12 Time acquisition part 13 Sensor 14 Accumulation part 15 Storage part 16 Target position acquisition part 17 Near field communication part 18 Judgment part 19 Aggregation part 20 Transmission part

Claims (8)

A mobile terminal device that performs wireless communication,
A position acquisition unit for acquiring the current position;
A time acquisition unit for acquiring the current time;
A sensor for acquiring sensor data;
An accumulator that accumulates the sensor data acquired by the sensor, and the position acquired by the position acquisition unit and the time acquired by the time acquisition unit when the sensor data is acquired;
A short-range wireless communication unit that receives position information regarding the other mobile terminal device from another mobile terminal device by short-range wireless communication;
For each sensor data accumulated by the accumulation unit, the position information related to the own mobile terminal apparatus, the position information related to another mobile terminal apparatus received by the short-range wireless communication, and the position corresponding to the sensor data are included. A determination unit that determines whether or not to transmit the sensor data to the other mobile terminal device, using the stay position associated with the area;
A transmission unit that transmits the sensor data accumulated by the accumulation unit and the position and time corresponding to the sensor data to a server that collects the sensor data by wireless communication different from the short-range wireless communication; ,
The short-range wireless communication unit transmits the sensor data determined by the determination unit when transmitted to another mobile terminal device and the position and time corresponding to the sensor data to the other mobile terminal device by short-range wireless communication. Transmit and receive sensor data transmitted from other mobile terminal devices by short-range wireless communication, and the position and time corresponding to the sensor data,
The said storage part is a mobile terminal device which accumulate | stores the sensor data received by the said short distance wireless communication part, and the position and time corresponding to the said sensor data. Of the sensor data accumulated by the accumulation unit, further comprising an aggregation unit for aggregating sensor data corresponding to the same area and the same period,
The mobile terminal apparatus according to claim 1, wherein the transmission unit transmits the sensor data aggregated by the aggregation unit and the position and time corresponding to the sensor data to the server. The location information includes a current location,
When the distance between the current position of the mobile terminal device and the stay position corresponding to the sensor data is greater than the distance between the current position of another mobile terminal device and the stay position, the determination unit The mobile terminal apparatus according to claim 1, wherein the mobile terminal apparatus determines to transmit to the other mobile terminal apparatus. The position information includes a target position that is a position of the destination,
The determination unit obtains the sensor data when the distance between the target position of the mobile terminal device and the stay position corresponding to the sensor data is larger than the distance between the target position of another mobile terminal device and the stay position. The mobile terminal apparatus according to claim 1, wherein the mobile terminal apparatus determines to transmit to the other mobile terminal apparatus. The position information includes a current position and a target position that is a position of the movement destination,
The determination unit determines that an angle between a vector from the current position of the own mobile terminal device to a target position and a vector from the current position of the own mobile terminal device to a stay position corresponding to the sensor data is the current of another mobile terminal device. Determining that the sensor data is transmitted to the other mobile terminal device when the angle between the vector from the position to the destination position and the vector from the current position of the other mobile terminal device to the staying position is greater than the angle. The mobile terminal device according to claim 1 or 2. The mobile terminal apparatus according to claim 4 or 5, wherein the target position is a position of a movement destination at a point in time that is predetermined from a current point in time. A sensor data transmission method processed in a mobile terminal device performing wireless communication,
A position acquisition step for acquiring the current position;
A time acquisition step for acquiring the current time;
A sensor data acquisition step for acquiring sensor data;
A first accumulating step for accumulating the sensor data acquired in the sensor data acquiring step, and the position acquired by the position acquiring step and the time acquired by the time acquiring step when acquiring the sensor data;
A first reception step of receiving position information regarding the other mobile terminal device from another mobile terminal device by short-range wireless communication;
Corresponding to the area including the position information relating to the own mobile terminal device, the location information relating to the other mobile terminal device received by the short-range wireless communication, and the location corresponding to the sensor data, for each accumulated sensor data A determination step of determining whether to transmit the sensor data to the other mobile terminal device using the stay position obtained;
A first transmission step of transmitting sensor data determined to be transmitted to another mobile terminal device in the determination step, and a position and time corresponding to the sensor data to the other mobile terminal device by short-range wireless communication; ,
A second receiving step of receiving sensor data transmitted from another mobile terminal device by short-range wireless communication, and a position and time corresponding to the sensor data;
A second accumulating step for accumulating the sensor data received in the second receiving step and the position and time corresponding to the sensor data;
A second transmission step of transmitting the accumulated sensor data and the position and time corresponding to the sensor data to a server that collects the sensor data by wireless communication different from the short-range wireless communication; Sensor data transmission method. Computer
A program for functioning as a mobile terminal device that performs wireless communication,
The sensor data acquired by the sensor that acquires the sensor data, the position acquired by the position acquisition unit that acquires the current position, and the time acquired by the time acquisition unit that acquires the current time when the sensor data is acquired An accumulator that accumulates
A short-range wireless communication unit that receives position information related to the other mobile terminal device from another mobile terminal device by short-range wireless communication;
For each sensor data accumulated by the accumulation unit, the position information related to the own mobile terminal apparatus, the position information related to another mobile terminal apparatus received by the short-range wireless communication, and the position corresponding to the sensor data are included. A determination unit that determines whether to transmit the sensor data to the other mobile terminal device using the stay position associated with the area;
The sensor data accumulated by the accumulation unit and the position and time corresponding to the sensor data are caused to function as a transmission unit that transmits the sensor data by wireless communication different from the short-range wireless communication,
The short-range wireless communication unit transmits the sensor data determined by the determination unit when transmitted to another mobile terminal device and the position and time corresponding to the sensor data to the other mobile terminal device by short-range wireless communication. Transmit and receive sensor data transmitted from other mobile terminal devices by short-range wireless communication, and the position and time corresponding to the sensor data,
The storage unit is a program for storing sensor data received by the short-range wireless communication unit and a position and time corresponding to the sensor data.

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