Source: https://patents.google.com/patent/JP2008104029A/en
Timestamp: 2020-02-17 11:31:12
Document Index: 423898991

Matched Legal Cases: ['art 218', 'art 214', 'art 218', 'art 222', 'art 226', 'art 230', 'art 232', 'art\n2006']

JP2008104029A - Location storage unit, radio terminal, location storage system, location registration method, and method and program for updating location - Google Patents
Location storage unit, radio terminal, location storage system, location registration method, and method and program for updating location Download PDF
JP2008104029A
JP2008104029A JP2006285558A JP2006285558A JP2008104029A JP 2008104029 A JP2008104029 A JP 2008104029A JP 2006285558 A JP2006285558 A JP 2006285558A JP 2006285558 A JP2006285558 A JP 2006285558A JP 2008104029 A JP2008104029 A JP 2008104029A
JP2006285558A
JP2008104029A5 (en
JP4957174B2 (en
2006-10-19 Application filed by Sony Corp, ソニー株式会社 filed Critical Sony Corp
2006-10-19 Priority to JP2006285558A priority Critical patent/JP4957174B2/en
2008-05-01 Publication of JP2008104029A5 publication Critical patent/JP2008104029A5/ja
2008-05-01 Publication of JP2008104029A publication Critical patent/JP2008104029A/en
2012-06-20 Publication of JP4957174B2 publication Critical patent/JP4957174B2/en
230000002596 correlated Effects 0 abstract 4
A location storage device, a wireless terminal, a location storage system, a location registration method, a location update method, and a program are provided.
A storage unit 214 in which position information of a base station 30 that performs radio communication with a radio terminal 40 and base station identification information uniquely assigned to each base station are registered in association with each other, and each base A receiving unit for receiving signal strength information in which signal strength or signal strength of a signal received by a wireless terminal from a station is associated with base station identification information of a base station that has transmitted the signal, and a storage unit A registration determination unit that refers to the base station identification information registered in the base station and determines whether the base station identification information included in the signal strength information received by the reception unit is registered in the storage unit in association with the position information 222, and a registration unit 226 that registers the base station identification information determined to be unregistered in the storage unit by the registration determination unit and predetermined position information corresponding to the position of the wireless terminal in the storage unit in association with each other. It is characterized by providing.
The present invention relates to a location storage device, a wireless terminal, a location storage system, a location registration method, a location update method, and a program.
In addition, a position estimation device capable of communicating with a wireless terminal by measuring a signal strength of a signal transmitted from the wireless base station by a wireless terminal that performs wireless communication with a base station (access point) of a wireless LAN (Local Area Network) A position estimation method for estimating the position of the wireless terminal based on the signal strength is also conceivable. For example, a wireless LAN base station transmits a beacon for notifying the presence of a wireless LAN base station to the surroundings at a constant cycle (for example, 5 times / second). The wireless terminal transmits the signal strength of the beacon to the position estimation device, and the position estimation device can estimate the position of the wireless terminal based on the signal strength and the position of the wireless LAN base station registered in advance. . According to the position estimation method, since the base station of the wireless LAN is also installed indoors or underground, it is possible to estimate the position indoors or underground that is difficult with the position estimation technology based on GPS positioning. That is, the position estimation method described above is a position estimation technique excellent in convenience and simplicity if base station information indicating the position of a base station of a wireless LAN installed around a wireless terminal is registered in the position estimation device. It can be said.
However, wireless LAN base stations are often installed by an unspecified number of users. Therefore, it is difficult to register the base station information of all wireless LAN base stations in the position estimation device in advance. Further, there is a possibility that the base station of the wireless LAN is added or the installation position is changed, and it is troublesome to manually update the base station information of the position estimation device every time the base station is added or changed.
Therefore, the present invention has been made in view of the above problems, and an object of the present invention is a novel and capable of automatically reflecting the actual installation status of the base station in the base station information. An object of the present invention is to provide an improved location storage device, wireless terminal, location storage system, location registration method, location update method, and program.
In order to solve the above-described problem, according to an aspect of the present invention, position information of a base station that performs wireless communication with a wireless terminal is associated with base station identification information uniquely assigned to each base station. Signal strength associated with the storage unit registered in this manner, information obtained from the signal strength or signal strength of the signal received by the wireless terminal from each base station, and base station identification information of the base station that transmitted the signal The base station identification information included in the signal strength information received by the reception unit is registered in the storage unit in association with the position information with reference to the reception unit that receives the information and the base station identification information registered in the storage unit A registration determination unit that determines whether or not the information is registered, base station identification information that is determined to be unregistered in the storage unit by the registration determination unit, and predetermined position information that corresponds to the position of the wireless terminal A registration unit for registering in the storage unit. And wherein the position storage device is provided.
In such a configuration, the signal strength associated with the signal strength or signal strength of the signal received by the wireless terminal from the base station by the receiving unit and the base station identification information of the base station that transmitted the signal is associated. Receive information. Then, the registration determination unit extracts base station identification information not registered in the storage unit from the base station identification information included in the signal strength information received by the reception unit. Next, the registration unit registers the unregistered base station identification information in the extracted storage unit in the storage unit in association with predetermined position information corresponding to the position of the wireless terminal. Therefore, the position storage device can gradually satisfy the base station information stored in the storage unit based on the signal strength information received from the wireless terminal. That is, the position storage device can save time and effort to manually set the base station information in the position storage device, and can automatically acquire the actual installation status of the base station.
The wireless communication terminal further includes a position estimation unit that estimates the position of the wireless terminal based on the signal strength information and the position information of the base station registered in the storage unit, and the registration unit determines that the registration determination unit is unregistered in the storage unit The base station identification information thus made and the position information indicating the position of the wireless terminal estimated by the position estimation unit may be associated with each other and registered in the storage unit. In such a configuration, the registration determining unit estimates the base station identification information included in the signal strength information received by the receiving unit that is determined to be unregistered in the storage unit by the position estimating unit. Registered in the storage unit in association with the position information of the wireless terminal. Here, in reality, the base station determined to be unregistered and the wireless terminal are separated by an estimated distance estimated based on the signal strength at the wireless terminal of the signal transmitted by the base station. Conceivable. That is, there is a high possibility that the base station determined to be unregistered is located on the circumference whose center is the wireless terminal and whose radius is the estimated distance. Therefore, by temporarily setting the position of the base station determined to be unregistered as the estimated position of the wireless terminal, the position between the actual base station position and the registered base station position is determined. The maximum error that can occur can be suppressed.
The receiving unit further receives terminal location information indicating the location of the wireless terminal, the registration unit is the base station identification information determined to be unregistered in the storage unit by the registration determining unit, and the terminal location received by the receiving unit Information may be associated with and registered in the storage unit. In such a configuration, the location storage device associates the base station identification information included in the signal strength information that is determined to be unregistered in the storage unit by the registration determination unit with the terminal location information. Can be registered. That is, the registration unit registers new base station information in the storage unit by simply using the terminal location information received by the reception unit without requiring a process of estimating the wireless terminal location based on the signal strength information in the location estimation unit. It is possible.
The receiving unit may receive the signal strength information at one or more time points stored in the wireless terminal. In such a configuration, for example, when a base station information database, a signal strength information history database at one or more points in time, and a position estimation function are provided on the wireless terminal side, the wireless terminal may You can check your terminal's location without having to access it every time. However, since the installation status of the base station changes from moment to moment, the base station information database needs to be updated following the change. Therefore, by transmitting signal strength information at one or more time points from the database of signal strength information history on the wireless terminal side to the position storage device at a predetermined timing, the position storage device does not store the signal strength information in the storage unit. The registered base station information can be newly registered. Further, if the location storage device transmits base station information newly registered in the storage unit to the wireless terminal, the new base station information can be registered in the base station information database of the wireless terminal.
In order to solve the above problem, according to another aspect of the present invention, position information of a base station that performs wireless communication with a wireless terminal, and base station identification information uniquely assigned to each base station are provided. The storage unit registered in association with the information obtained from the signal strength or signal strength of the signal received by the wireless terminal from each base station, and the base station identification information of the base station that transmitted the signal are associated with each other. Whether the receiving unit that receives the signal strength information and the position information of the base station registered in the storage unit satisfies a predetermined constraint condition based on the distance between the wireless terminal and the base station estimated from the signal strength information There is provided a position storage device comprising: a base station information determination unit to determine; and an update unit that updates the position information of the base station determined by the base station information determination unit not to satisfy a predetermined constraint condition. The
In such a configuration, the base station information determination unit determines whether the position information of the base station registered in the storage unit satisfies a predetermined constraint based on the distance between the wireless terminal and the base station estimated from the signal strength information. The update unit updates the location information of the base station determined by the base station information determination unit as not satisfying the predetermined constraint condition. Therefore, the location storage device can automatically update the base station information registered in the storage unit based on the operations of the base station information determination unit and the update unit. For example, even when the installation position of the base station registered in the storage unit is changed, the position storage device does not require human processing to determine the position of the base station after the change of the installation position. The base station information registered in the storage unit can be reflected.
The base station information determining unit is configured to store the distance between the first base station and the second base station that perform wireless communication with the wireless terminal, and the position information of the first base station and the second base station registered in the storage unit. An inter-base station distance calculation unit that calculates based on the signal strength, an estimation that adds the distance between the wireless terminal and the first base station, and the distance between the wireless terminal and the second base station, estimated from the signal strength information A distance adding unit; and a constraint condition determining unit that determines that the constraint condition is not satisfied when there is a difference between the distance calculated by the inter-base station distance calculating unit and the distance calculated by the estimated distance adding unit. May be.
The constraint condition determination unit may determine that the constraint condition is not satisfied when the distance calculated by the inter-base station distance calculation unit is longer than the distance calculated by the estimated distance addition unit by a set boundary value or more. In such a configuration, the constraint condition determination unit calculates the distance calculation unit between base stations based on the characteristic that the sum of the lengths of any two sides of the triangle is never shorter than the length of the other side. It can be determined that the restriction condition is not satisfied when the distance between the base stations is longer than the addition distance calculated by the estimated distance addition unit. In addition, by providing a set boundary value, the constraint condition determination unit considers the possibility of an error if the difference is within the set boundary value even when the addition distance is calculated to be shorter than the distance between base stations. It can be judged that As a result, it is possible to suppress a case where the update unit updates the base station information in the storage unit that does not need to be updated.
The updating unit is configured such that the distance between the first base station and the second base station is the position indicated by the position information of the first base station registered in the storage unit and the position indicated by the position information of the second base station. Registered in the storage unit so as to be within the range of the distance between the wireless terminal and the first base station, and the distance obtained by adding the distance between the wireless terminal and the second base station. The station location information can be updated.
The receiving unit further receives terminal position information indicating the position of the wireless terminal, and the base station information determining unit is configured to receive the position indicated by the terminal position information received by the receiving unit and the position of one base station registered in the storage unit. A registered distance calculating unit that calculates a distance from the position indicated by the information, a distance calculated by the registered distance calculating unit, and a wireless terminal estimated based on a signal strength corresponding to one base station and one base station You may make it further provide the constraint condition judgment part which judges that a constraint condition is not satisfy | filled when there is a difference in distance.
The constraint condition determination unit satisfies the constraint condition when the distance calculated by the registered distance calculation unit is shorter than the distance between the wireless terminal and the one base station estimated based on the signal strength corresponding to the one base station. You may make it judge that it is not. Here, it can be said that the distance between the wireless terminal and one base station estimated based on the signal strength is large in many cases when estimated longer than the actual one, but is rare when estimated shorter than the actual one. This is because the signal strength of a signal transmitted by a base station often passes through obstacles and repeats reflection until reaching the wireless terminal, but the signal strength is attenuated theoretically. This is because there are few cases where the signal intensity is relieved or the signal strength is increased. The base station information registered in the storage unit that is likely to be free from the installation status of the actual base station, as the constraint condition determination unit makes the above determination based on the actual situation Can be updated.
The updating unit is configured such that the distance between the one base station and the wireless terminal is a distance between the position indicated by the terminal position information received by the receiving unit and the position indicated by the position information of the one base station registered in the storage unit, You may make it update the positional information on the base station registered into the memory | storage part so that it may be in the range of the distance between the radio | wireless terminal estimated based on signal strength information and one base station.
The receiving unit may receive the signal strength information at one or more time points stored in the wireless terminal. In such a configuration, for example, when a base station information database, a signal strength information history database at one or more points in time, and a position estimation function are provided on the wireless terminal side, the wireless terminal may You can check your terminal's location without having to access it every time. However, since the installation status of the base station changes from moment to moment, the base station information database needs to be updated following the change. Therefore, at a predetermined timing, the signal strength information at one or more time points is transmitted from the database of signal strength information history on the wireless terminal side to the position storage device, thereby registering in the storage unit in the position storage device. The base station information being updated can be updated. Furthermore, if the location storage device transmits the base station information registered in the updated storage unit to the wireless terminal, the base station information database of the wireless terminal can also be updated.
In order to solve the above-described problem, according to another aspect of the present invention, a wireless terminal that performs wireless communication with a plurality of base stations, and measures the signal strength of signals received from the plurality of base stations Of signal strength information at one or more time points in which a signal processing unit, information obtained from signal strength or signal strength measured by the measurement unit, and base station identification information uniquely assigned to each base station are associated with each other A history information storage unit that stores the history, and a transmission unit that transmits the history of the signal strength information stored in the history information storage unit to a position storage device that can estimate the position of the wireless terminal based on the signal strength information. A wireless terminal is provided.
In such a configuration, the history information storage unit 1 or 2 in which the signal intensity measured by the measurement unit or the information obtained from the signal strength is associated with the base station identification information uniquely given to each base station. A history of signal strength information at the above time can be stored. Therefore, the transmission unit can collectively transmit the signal strength information history to the position storage device. As a result, the number of traffics between the wireless terminal and the location storage device is reduced. Alternatively, based on the wireless terminal, the position storage device, or the traffic situation, the history of signal strength information can be transmitted to the position storage device when the load is small.
Base station information storage unit in which base station information in which position information of a plurality of base stations is associated with base station identification information is registered, and base station information and signal strength information registered in the base station information storage unit And a position estimation unit that estimates the position of the wireless terminal based on the above. In such a configuration, the wireless terminal can confirm its own terminal position based on the built-in base station information storage unit and position estimation unit without communicating with the position storage device. That is, since the wireless terminal can exclude the access process to the position storage device every time the position is estimated, the wireless terminal can quickly confirm its own terminal position.
The history information storage unit is further registered with a history of terminal location information indicating the location of the wireless terminal at one or more time points, and the transmission unit transmits the signal strength information and the terminal location information to the location storage device. Also good. In such a configuration, the history information storage unit may store a history of signal strength information at one or more time points and a history of terminal position information indicating the position of the wireless terminal at one or more time points. it can. Therefore, the transmission unit can collectively transmit the signal strength information and the history of the terminal position information to the position storage device. As a result, the number of traffics between the wireless terminal and the location storage device is reduced. Alternatively, based on the wireless terminal, the position storage device, or the traffic situation, the signal strength information and the history of the terminal position information can be transmitted to the position storage device when the load is small.
The base station information registered in the base station information storage unit includes the location information of a plurality of base stations registered in the storage unit of the location storage device, and base station identification information uniquely assigned to each base station. An information updating unit that updates the associated base station information may be further provided. In such a configuration, the storage unit of the position storage device includes, for example, base station information that is not registered in the base station information storage unit, or there is a difference between the base station information registered in the base station information storage unit. The wireless terminal receives the base station information from the storage unit of the location storage device and registers new base station information in the base station information storage unit or the base station information registered in the base station information storage unit Can be modified or updated.
In order to solve the above problem, according to another aspect of the present invention, a position including a wireless terminal that performs wireless communication with a plurality of base stations, and a position storage device in which the positions of the plurality of base stations are registered A storage system is provided. The wireless terminal includes a measuring unit that measures signal strength of signals received from a plurality of base stations, information obtained from the signal strength or signal strength measured by the measuring unit, and a base station that is uniquely given to each base station And a transmitter that transmits the signal strength information at one or more time points associated with the identification information to the position storage device. In addition, the location storage device is registered in the storage unit in which the location information of the base station and the base station identification information are registered in association with each other, the reception unit that receives the signal strength information from the wireless terminal, and the storage unit A registration determination unit that determines whether or not the base station identification information included in the signal strength information received by the reception unit is registered in the storage unit, and a registration determination unit that does not store the base station identification information in the storage unit. And a registration unit that registers the base station identification information determined to be registered and predetermined position information corresponding to the position of the wireless terminal in the storage unit in association with each other.
In order to solve the above problem, according to another aspect of the present invention, a position including a wireless terminal that performs wireless communication with a plurality of base stations, and a position storage device in which the positions of the plurality of base stations are registered A storage system is provided. The wireless terminal includes a measuring unit that measures signal strength of signals received from a plurality of base stations, information obtained from the signal strength or signal strength measured by the measuring unit, and a base station that is uniquely given to each base station A transmission unit that transmits the signal strength information at one or more time points associated with the identification information to the position storage device. The location storage device includes a storage unit in which location information of a base station and base station identification information are registered in association with each other, a receiving unit that receives signal strength information from a wireless terminal, and a base station registered in the storage unit. A base station information determination unit that determines whether or not the position information satisfies a predetermined constraint condition based on a distance between the wireless terminal and the base station estimated from the signal strength information, and the base station information determination unit includes a predetermined constraint condition And an update unit that updates the position information of the base station that is determined not to satisfy the above.
In order to solve the above problem, according to another aspect of the present invention, position information of a base station that performs wireless communication with a wireless terminal, base station identification information uniquely assigned to each base station, Are registered in the storage medium in association with each other, information obtained from the signal strength or signal strength of the signal received by the wireless terminal from the base station, and base station identification information of the base station that transmitted the signal are associated with each other Receiving signal strength information and referring to base station identification information registered in the storage medium to determine whether or not the base station identification information included in the received signal strength information is registered in the storage medium And registering in the storage medium the base station identification information determined to be unregistered in the storage medium and predetermined position information corresponding to the position of the wireless terminal in association with each other. , Location registration The law is provided.
In order to solve the above problem, according to another aspect of the present invention, position information of a base station that performs wireless communication with a wireless terminal, base station identification information uniquely assigned to each base station, Are registered in the storage medium in association with each other, information obtained from the signal strength or signal strength of the signal received by the wireless terminal from the base station, and base station identification information of the base station that transmitted the signal are associated with each other Receiving the signal strength information and determining whether the position information of the base station registered in the storage medium satisfies a predetermined constraint condition based on a distance between the wireless terminal and the base station estimated from the signal strength information And a step of updating location information of a base station determined not to satisfy a predetermined constraint condition.
In order to solve the above problem, according to another aspect of the present invention, information obtained from a signal strength or signal strength of a signal received by a wireless terminal from each base station that performs wireless communication with the wireless terminal is provided. And the base station identification information of the base station that transmitted the signal, the receiving unit that receives the signal strength information associated with the base station identification information, and the base station identification information registered in the storage medium in association with the position information of the base station The registration determination unit that determines whether or not the base station identification information included in the signal strength information received by the reception unit is registered in the storage medium, and the registration determination unit determines that it is unregistered in the storage medium There is provided a program for functioning as a location storage device including a registration unit that registers the registered base station identification information and predetermined location information according to the location of the wireless terminal in association with each other.
In order to solve the above problem, according to another aspect of the present invention, information obtained from a signal strength or signal strength of a signal received by a wireless terminal from each base station that performs wireless communication with the wireless terminal is provided. A base station identification information of the base station that transmitted the signal, a receiving unit that receives the associated signal strength information, and a base station that is registered in the storage medium in association with the base station identification information of the base station The base station information determination unit for determining whether or not the position information of the base station satisfies a predetermined constraint condition based on a distance between the wireless terminal and the base station obtained from the signal strength information, and the base station information determination unit An update unit that updates position information of a base station that has been determined not to satisfy the conditions, and a program for causing the program to function as a position storage device provided are provided.
As described above, according to the position storage device, wireless terminal, position storage system, position registration method, position update method, and program according to the present invention, the actual installation status of the base station is automatically reflected in the base station information. It is possible.
First, the position estimation system 10 according to the first embodiment of the present invention will be described. The position estimation system 10 as an example of the position storage system according to the present embodiment has a feature that the position estimation device 20 constituting the position estimation system 10 should be noted. Specifically, the position estimation device 20 functions to estimate the position of the wireless terminal 40 in cooperation with the wireless terminal 40 that performs wireless communication with a plurality of base stations, and when the new base station is confirmed, the position of the base station It has a function of registering information and a function of updating location information of registered base stations. Hereinafter, description will be made with reference to FIGS.
FIG. 1 is an explanatory diagram showing a configuration of a position estimation system 10 according to the present embodiment. The position estimation system 10 includes a position estimation device 20, base stations 30, 31 and 32, and a wireless terminal 40.
The base stations 30, 31, and 32 relay communication between spatially dispersed communication devices. For example, the base stations 30, 31, and 32 relay wireless communication between the wireless terminal 40 and another wireless terminal (not shown) within the respective radio wave reachable ranges, or the wireless terminal 40 and the base station 30, It is possible to relay communication with a communication device connected to 31 or 32 by wire. Specifically, the base station 30 may be a wireless LAN (Local Area Network) base station based on the WiFi (Wireless Fidelity) standard, a GSM (Global System for Mobile Communications) base station, or a Bluetooth base station. May be a base station. Since the base stations 30, 31, and 32 have substantially the same configuration, the base station 30 will be described below as an example.
The base station 30 can periodically transmit a beacon signal for notifying the surroundings of the presence of the base station 30 in addition to a signal transmitted when relaying wireless communication. The beacon signal includes, for example, a base station ID as base station identification information uniquely given to the base station 30. As a result, the radio terminal 40 can confirm the presence of the base station 30 existing in the vicinity based on the base station ID of the received beacon signal.
The wireless terminal 40 can transmit and receive various data based on wireless communication controlled by the base station 30. For example, the wireless terminal 40 can receive content data from a content distribution server (not shown) via the base station 30 and can send and receive e-mails with other wireless terminals (not shown). Content data includes music data such as music, lectures and radio programs, video data such as movies, television programs, video programs, photographs, pictures and charts, and arbitrary data such as games and software. It is done.
Such a wireless terminal 40 includes, for example, a PC (Personal Computer), a home video processing device (DVD recorder, VCR, etc.), a mobile phone, a PHS (Personal Handyphone System), a portable music player, and a portable device. It may be an information processing device such as a video processing device, a PDA (Personal Digital Assistant), a home game device, a portable game device, or a home appliance.
In addition, when the radio terminal 40 receives a signal (for example, a beacon signal) transmitted from the base station 30, 31, or 32, the radio terminal 40 measures the signal strength of the signal, and the measured signal strength is determined as the base station 30, 31, or 32. Can be transmitted to the position estimation apparatus 20 as signal strength information.
The position estimation device 20 stores the base station information in which the position information where the base stations 30, 31 and 32 are installed in advance is associated with the base station ID, and the signal strength information received from the radio terminal 40 Based on the base station information, for example, it has a function of estimating the position of the wireless terminal 40 by the principle of triangulation. The position estimation device 20 notifies the wireless terminal 40 of the estimated position, and the wireless terminal 40 can recognize its own terminal position. Note that the position estimation device 20 is not limited to the wireless terminal 40 and can respond to position estimation requests from a plurality of other wireless terminals.
Further, the position estimation device 20 according to the present embodiment sets the contents of the base station information to be stored when the base station is newly installed or when the position of the base station is changed. It is characterized by the fact that it can be updated following the situation. Hereinafter, the detailed configuration of the position estimation apparatus 20 according to the present embodiment will be described with reference to FIG.
FIG. 2 is a block diagram showing a configuration of the position estimation apparatus 20 according to the present embodiment. The position estimation device 20 includes a communication unit 210, a storage unit 214, a position estimation unit 218, a registration determination unit 222, a registration unit 226, a base station information determination unit 230, and an update unit 240. Functions as a device.
The communication unit 210 is an interface for transmitting / receiving information to / from the wireless terminal 40. The communication unit 210 has, for example, a function as a reception unit that receives signal strength information from the wireless terminal 40 and a function as a transmission unit that transmits a position estimation result to the wireless terminal 40. The communication unit 210 may be a wireless LAN compatible communication device, a wireless USB compatible communication device, or a wire communication device that performs wired communication. In addition, the communication unit 210 can transmit and receive information with not only one wireless terminal but also two or more unspecified wireless terminals.
The storage unit 214 stores the base station ID of the base station that performs wireless communication with the wireless terminal 40 and the position information indicating the installation location of the base station in association with each other as base station information. An example of base station information stored in the storage unit 214 will be described with reference to FIG.
FIG. 3 is an explanatory diagram showing an example of base station information stored in the storage unit 214. As shown in FIG. 3, the storage unit 214 stores a base station ID and a latitude and longitude as position information where the base station is installed in association with each other. Specifically, the base station 30 with the base station ID “30” is registered in the storage unit 214 as being installed at longitude (east longitude) “135.001” and latitude (north latitude) “35.49”. Yes.
Similarly, the base station 31 with the base station ID “31” has the longitude “135.002” and the latitude “35.41”, and the base station 32 with the base station ID “32” has the longitude “135.003” and the latitude. The base station 34 with the base station ID “34” at “35.50” is registered in the storage unit 214 as being installed at the longitude “135.002” and the latitude “35.42”. In the present specification, the base station ID is described using the same number as the code of the corresponding base station.
Further, the format of the position information stored in the storage unit 214 is not limited to the format using latitude and longitude, and may be, for example, a format using x, y coordinates or a format using polar coordinates. A format using a vector may be used.
In addition, the storage unit 214 includes a nonvolatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) and an ERPM (Erasable Programmable Read Only Memory), a hard disk and a floppy (registered trademark) CD, and other R-disks. (Compact Disk Recordable) / RW (ReWriteable), DVD-R (Digital Versatile Disk Recordable) / RW / + R / + RW / RAM (Ramdam Access Memory) and BD (Blu-R / B) Optical discs such as RE and MO (Magneto It may be a storage medium such as an optical disc.
Returning to the description of FIG. 2, the position estimation unit 218 is registered in the storage unit 214 with the signal strength information received from the wireless terminal 40 via the communication unit 210 in response to the position estimation request from the wireless terminal 40. Based on the base station information, the position where the wireless terminal 40 exists is estimated. Hereinafter, it demonstrates in detail using FIG.
FIG. 4 is an explanatory diagram showing an example of signal strength information received from the wireless terminal 40 by the position estimation unit 218. As shown in FIG. 4, in the signal strength information, the base station ID of the base station is associated with the signal strength at the radio terminal 40 of the signal transmitted from the base station. In FIG. 4, the signal strength at the wireless terminal 40 of the signal transmitted from the base station 30 with the base station ID “30” is “−90 Dbm”, and the radio of the signal transmitted from the base station 31 with the base station ID “31” is shown. The signal strength in the terminal 40 is “−70 Dbm”, and the signal strength in the wireless terminal 40 of the signal transmitted from the base station 32 with the base station ID “32” is “−80 Dbm”.
The signal strength information is not limited to the configuration shown in FIG. For example, the signal strength of a signal transmitted by the base station decreases as the distance from the base station increases according to a predetermined rule. For this reason, it is possible to calculate the distance between the base station that transmitted the signal and the radio terminal 40 from the signal strength of the signal at the radio terminal 40. Therefore, the signal strength information may have a configuration in which the base station ID of the base station is associated with the distance between the base station and the radio terminal 40 as information obtained from the signal strength.
The position estimation unit 218 estimates the position O of the wireless terminal 40 based on the following Equation 1 using such signal strength information and base station information registered in the storage unit 214.
In Equation 1, Ai indicates the position information of the i-th base station registered in the storage unit 214. Therefore, when the base station information is represented by longitude and latitude as shown in FIG. 3, Equation 1 is applied for each longitude and latitude. Wi is a weighting coefficient obtained based on distS (O, Ai) indicating the distance between the radio terminal 40 and the i-th base station estimated from the signal strength, as shown in Equation 2. W is the sum of the weighting coefficients as shown in Equation 3.
Referring to Equation 1, the position information of the base station having a small distS (O, Ai) is largely reflected in the position O of the wireless terminal 30. On the other hand, the position information of the base station having a large distS (O, Ai) has a small influence on the position O of the wireless terminal 40. The position estimation unit 218 can reasonably estimate the position O of the wireless terminal 40 by using Equation 1 described above. Then, the position estimation unit 218 notifies the wireless terminal 40 of the estimated position O, so that a user using the wireless terminal 40 can confirm his / her location.
Note that the method of estimating the position of the wireless terminal 40 is not limited to the method using Formula 1 above. For example, the position of the base station that is the transmission source of the signal received by the wireless terminal 40 with the highest signal strength It may be estimated that there is. Further, the position at which the wireless terminal 40 becomes the center of the base station that is the transmission source of the signal received with a signal strength equal to or higher than a predetermined threshold may be estimated as the position of the wireless terminal 40.
The position estimation device 20 including such a position estimation unit 218 can estimate the position of the wireless terminal 40 based on the signal strength of the signal received from the wireless LAN base station by the wireless terminal 40 corresponding to the wireless LAN, for example. . Here, there is a high possibility that the base station of the wireless LAN is arranged in places such as underground and indoors. Therefore, when the wireless terminal 40 corresponds to the wireless LAN, the position estimation device 20 can estimate the position of the wireless terminal 40 regardless of the position where the wireless terminal 40 exists.
On the other hand, as a premise for estimating the position of the wireless terminal 40, the position estimation device 20 needs to register the position information of the base station in advance as described above. Therefore, when the wireless terminal 40 supports a wireless LAN, the position estimation device 20 needs to store the position information of the wireless LAN base station in advance. However, since there are many cases where an unspecified number of users are arbitrarily installed in a wireless LAN base station, it is difficult to register the position information of the wireless LAN base station in the position estimation device 20. In addition, the location of the wireless LAN base station may be changed.
Therefore, the position estimation apparatus 20 according to the present embodiment is made in view of the above situation, and the position estimation apparatus 20 automatically sets the actual base station installation state in the storage unit 214 of the position estimation apparatus 20. Can be reflected.
Hereinafter, the configuration of the registration determination unit 222 and the registration unit 226 of the position estimation device 20 as the first means for realizing the above effect will be described, and then the base station information determination unit 230 and the update unit as the second means The configuration of 240 will be described.
The registration determination unit 222 and the registration unit 226 according to the present embodiment can additionally register unregistered base station information in the storage unit 214 in response to a location estimation request or a location registration request from the wireless terminal 40. The position estimation request is a request for the position estimation device 20 to estimate the position of the wireless terminal 40. The wireless terminal 40 transmits the signal strength information together with the position estimation request so that the position estimation device 20 can estimate the position of the wireless terminal 40 in response to the position estimation request. On the other hand, the location registration request is a request for the location estimation device 20 to register the location of the wireless terminal 40. The radio terminal 40 transmits the signal strength information and the terminal location information indicating the location of the radio terminal 40 together with the location registration request so that the location estimation device 20 can execute a predetermined process in response to the location registration request.
Since the processing of the position estimation device 20 differs depending on whether the position estimation request or the position registration request is received, first, the registration determination unit 222 and the registration unit 226 when the position estimation device 20 receives the position estimation request. After describing the processing in, processing in the registration determination unit 222 and the registration unit 226 when the position estimation device 20 receives a position registration request will be described.
When receiving the signal strength information transmitted together with the position estimation request by the wireless terminal 40, the registration determining unit 222 determines whether or not each base station ID included in the received signal strength information is registered in the storage unit 214. to decide. Then, the registration unit 226 registers the base station ID included in the signal strength information determined not to be registered in the storage unit 214 by the registration determination unit 222 in the storage unit 214 in association with predetermined position information.
For example, as shown in FIG. 5, consider a case where a base station 33 exists in addition to the base stations 30, 31 and 32 around the wireless terminal 40. Here, as illustrated in FIG. 3, the base station information of the base station 33 is not registered in the storage unit 214 of the position estimation device 20.
At this time, the registration determination unit 222 of the position estimation device 20 receives the signal strength information illustrated in FIG. 6 via the communication unit 210. That is, the base station ID “30” of the base station 30 is associated with the signal strength “−90 Dbm” at the wireless terminal 40 of the signal transmitted by the base station 30, and the base station ID “31” of the base station 31 The signal strength “−70 Dbm” of the signal transmitted from the base station 31 at the wireless terminal 40 is associated with the base station ID “32” of the base station 32 and the signal strength of the signal transmitted from the base station 32 at the wireless terminal 40. The signal strength information in which “−80 Dbm” is associated and the base station ID “33” of the base station 33 and the signal strength “−75 Dbm” of the signal transmitted by the base station 33 is associated is registered. Input to the unit 222.
When the registration determining unit 222 receives the signal strength information, the registration determining unit 222 refers to the base station information registered in the storage unit 214, and the base station information of the base stations 30, 31, and 32 is registered in the storage unit 214. However, it is determined that the base station information of the base station 33 is not registered in the storage unit 214. Therefore, the registration unit 226 is instructed to register the base station information of the base station 33 in the storage unit 214.
The registration unit 226 stores base station information in which the base station ID “33” of the base station 33 is associated with predetermined position information corresponding to the position of the wireless terminal 40 based on an instruction from the registration determination unit 222. New registration in the unit 214. Here, in parallel with the processing by the registration determination unit 222, the position estimation unit 218 estimates the position of the wireless terminal 40 based on the signal strength information transmitted together with the position estimation request from the wireless terminal 40 in response to the position estimation request. is doing. Therefore, the predetermined position information can be made to correspond to the position of the wireless terminal 40 estimated by the position estimation unit 218.
Actually, there is a high possibility that the base station 33 is installed at a distance corresponding to “−75 Dbm” from the wireless terminal 40. That is, the base station 33 is considered to be located in the vicinity of the circumference centered on the position of the wireless terminal 40 and having a radius corresponding to “−75 Dbm”. Here, since it is difficult to specify the position beyond that from the signal strength information, the registration unit 226 assumes that the base station 33 is installed at an arbitrary position near the circumference, and the base station information of the base station 33. Can also be registered in the storage unit 214. According to such a configuration, the arbitrary position and the actual installation position of the base station 33 may be approximated, but a large error occurs between the arbitrary position and the actual base station 33 installation position. Sometimes it ends up.
On the other hand, as described above, the registration unit 226 associates the base station ID “33” of the base station 33 with the location information indicating the location of the wireless terminal 40 estimated by the location estimation unit 218, and stores the storage unit 214. If the configuration is registered, the maximum value of an error that can occur between the actual installation position of the base station 33 and the position of the base station 33 registered in the storage unit 214 can be suppressed.
Note that the error between the base station information temporarily registered in the storage unit 214 and the actual installation position of the base station is determined by the update unit 240 (to be described later) appropriately using the base station information registered in the storage unit 214. It can be reduced by updating.
Next, processing in the registration determination unit 222 and the registration unit 226 when the position estimation device 20 receives the position registration request will be described.
When receiving the location registration request, the registration determining unit 222 registers each base station ID included in the received signal strength information in the storage unit 214 in the same manner as when the location estimation request is received. It is judged whether it is done. Then, the registration unit 226 registers the base station ID included in the signal strength information determined not to be registered in the storage unit 214 by the registration determination unit 222 in the storage unit 214 in association with predetermined position information.
Here, when the position estimation apparatus 20 receives a position registration request from the wireless terminal 40, the position estimation apparatus 20 also receives terminal position information that explicitly indicates the position of the wireless terminal 40. Therefore, when receiving the location registration request, the registration unit 226 associates the base station ID included in the signal strength information determined not to be registered in the storage unit 214 by the registration determination unit 222 with the terminal location information. In addition, it can be registered in the storage unit 214.
According to such a configuration, the position estimation device 20 stores the base station information of the unknown base station included in the signal strength information received from the radio terminal 40 without passing through the position estimation process of the radio terminal 40 by the position estimation unit 218. It can be provisionally registered in the unit 214.
In addition, the method by which the wireless terminal 40 acquires the terminal position information is not limited. For example, even if the wireless terminal 40 acquires the terminal position information by user input, the wireless terminal 40 acquires the terminal position information based on another position estimation function. May be.
As described above, the registration determination unit 222 and the registration unit 226 of the position estimation device 20 according to the present embodiment store new base station information in the storage unit 214 in response to the position estimation request or the position registration request from the wireless terminal 40. Can be registered. Therefore, the position estimation device 20 can automatically acquire the actual installation status of the base station by eliminating or suppressing the process of initially setting the base station information.
Next, configurations of the base station information determination unit 230 and the update unit 240 of the position estimation device 20 according to the present embodiment will be described with reference to FIGS.
The base station information determining unit 230 and the updating unit 240 according to the present embodiment make the base station information registered in the storage unit 214 more appropriate in response to a location estimation request or a location registration request from the wireless terminal 40. Update base station information.
In the following, since the processing of the position estimation apparatus 20 differs depending on whether the position estimation request or the position registration request is received, first, the base station information determination unit when the position estimation apparatus 20 receives the position estimation request 230 and the processing in the updating unit 240, the processing in the base station information determining unit 230 and the updating unit 240 when the position estimation device 20 receives a location registration request will be described.
FIG. 7 is a block diagram showing a more detailed configuration of the base station information determination unit 230. The base station information determination unit 230 includes an estimated distance calculation unit 232, an inter-base station distance calculation unit 234, a registered distance calculation unit 238, and a constraint condition determination unit 236.
When the estimated distance calculation unit 232 receives the signal strength information transmitted together with the position estimation request from the wireless terminal 40, the estimated distance between the base station and the wireless terminal 40 estimated based on the signal strength information, It functions as an estimated distance adding unit that calculates the added distance by adding the distance between the other base station and the wireless terminal 40. Even if the position estimation unit 218 estimates the distance between the one base station and the radio terminal 40 and the distance between the other base station and the radio terminal 40 based on the signal strength information, the radio terminal 40 side It may be estimated.
In addition, the estimated distance calculation unit 232 can calculate the above-mentioned addition distance for all combinations of base stations included in the received signal strength information. That is, when the signal strength information received by the communication unit 210 includes signal strengths regarding n base stations, the estimated distance calculation unit 232 has a number corresponding to (n · (n−1) / 2). The addition distance can be calculated.
The inter-base station distance calculation unit 234 reads out the position information of the base station corresponding to the base station ID included in the signal strength information received by the communication unit 210 from the storage unit 214. Then, the inter-base station distance calculation unit 234 calculates the inter-base station distance indicating the distance between one base station and another base station based on the base station position information read from the storage unit 214.
Similarly to the estimated distance calculation unit 232, the inter-base station distance calculation unit 234 can calculate the inter-base station distance using a combination of all base stations included in the received signal strength information. That is, when the signal strength information received by the communication unit 210 includes signal strengths related to n base stations, the inter-base station distance calculation unit 234 corresponds to (n · (n−1) / 2). A number of base station distances may be calculated.
The constraint condition determination unit 236 determines whether or not the addition distance calculated by the estimated distance calculation unit 232 and the inter-base station distance calculated by the inter-base station distance calculation unit 234 satisfy a predetermined constraint condition. Hereinafter, the constraint conditions will be described.
In FIG. 5, the addition distance is, for example, a distance obtained by adding the distance between the wireless terminal 40 and the base station 30 and the distance between the wireless terminal 40 and the base station 32. Further, the distance between the base stations is, for example, the distance between the base station 30 and the base station 32 in FIG. Here, in reality, in the triangle having the radio terminal 40, the base station 30, and the base station 32 as vertices, the total length of any two sides is never shorter than the length of the remaining one side. Therefore, the constraint condition determination unit 236 can use the condition shown in the following Equation 4 as the constraint condition.
In Formula 4, dist (Ai, Aj) represents the inter-base station distance between the i-th base station and the j-th base station, calculated by the inter-base station distance calculation unit 234. Further, the right side indicates an addition distance obtained by adding the distance between the wireless terminal 40 and the i-th base station and the distance between the wireless terminal 40 and the j-th base station, calculated by the estimated distance calculation unit 232. Moreover, in Formula 4, it is good also as (i <= j).
Ideally, the added distance should be larger than the distance between base stations based on the triangular characteristics as described above. Therefore, the right side indicating the addition distance and the left side indicating the distance between base stations are connected by an inequality sign as shown in Equation 4. When the constraint condition determination unit 236 determines that Formula 4 is not satisfied, the constraint condition determination unit 236 determines that the location information of the i-th and j-th base stations registered in the storage unit 214 does not satisfy the constraint condition. Can do.
Note that the constraint condition used by the constraint condition determination unit 236 is not limited to that shown in Equation 4. For example, a predetermined distance may be further added to the right side of Equation 4. That is, a predetermined distance can be added to the right side of Equation 4 as the set boundary value. In such a configuration, the constraint condition determination unit 236 determines that the constraint condition is not satisfied when the distance between the base stations is longer than the addition distance by a predetermined distance or more. Here, since the addition distance is calculated based on the signal strength, if the signal strength is not accurately measured in accordance with the environment around the wireless terminal 40, the addition distance becomes a value that is free from reality. Therefore, by providing the set boundary value as described above, the constraint condition determination unit 236 can determine the possibility of an error if the difference is within the set boundary value even when the addition distance is calculated to be shorter than the inter-base station distance. It can be determined that the constraint condition is taken into consideration. As a result, it is possible to suppress a case where the update unit 240 described later updates base station information in the storage unit 214 that does not need to be updated. Conversely, the constraint condition determination unit 236 may determine that the constraint condition is not satisfied when there is even a slight difference between the addition distance and the inter-base station distance.
The update unit 240 updates the base station information registered in the storage unit 214 that the base station information determination unit 230 determines that the constraint condition is not satisfied. For example, when the base station information determination unit 230 determines that the base station information of one base station and the other one base station does not satisfy the constraint condition, the update unit 240 may The base station information of one base station and another one base station registered in the storage unit 214 is updated so that the distance between the base stations is within the range of the addition distance and the distance between the base stations. Hereinafter, this will be specifically described with reference to FIG.
FIG. 8 is an explanatory diagram showing a process of updating base station information by the updating unit 240. 8, Ai indicates the position of the i-th base station based on the base station information registered in the storage unit 214, and Aj indicates the j-th base station based on the base station information registered in the storage unit 214. DistS (Ai, Aj) is equivalent to the right side of Equation 4, C is the midpoint on the Ai-Aj line, and Aist is distS (Ai so that the midpoint is C on the Ai-Aj line. , Aj) is the end on the Ai side, and Agest is the end on the Aj side when distS (Ai, Aj) is placed so that the middle point is C on the Ai-Aj line. Ai ′ indicates a position where the update unit 240 updates the base station information of the i-th base station in the storage unit 214, and Aj ′ indicates the base station information of the j-th base station in the storage unit 214. The position for updating is shown. Such Ai ′ and Aj ′ can be calculated according to Equation 5 and Equation 6.
In Equations 5 and 6, t is a coefficient that determines the plasticity from Ai to Ai ′, and can be changed in the range of (0 ≦ t ≦ 1). For example, if the value of t is increased, Ai ′ is closer to Ai. If the value of t is decreased, Ai ′ is separated from Ai. If the value of t is 0.5, Ai ′ is between Ai and Aiest. It becomes a point. The position estimation device 20 may be configured so that the value of the coefficient t that determines the plasticity can be changed based on user settings.
As described above, according to the position estimation device 20 according to the present embodiment, when the position estimation request is received from the wireless terminal 40, the position of the wireless terminal 40 is estimated and simultaneously notified to the wireless terminal 40 in the storage unit 214. The registered base station information can be updated. Therefore, even when the installation position of the base station registered in the storage unit 214 is changed, the actual base station installation position can be automatically reflected in the base station information registered in the storage unit 214. it can.
Next, processing in base station information determination unit 230 and update unit 240 when location estimation apparatus 20 receives a location registration request will be described.
When the communication unit 210 receives the location registration request from the wireless terminal 40, the estimated distance calculation unit 232 includes the base station included in the signal strength information based on the signal strength information transmitted from the wireless terminal 40 together with the location registration request. The distance between the base station corresponding to the ID and the wireless terminal 40 is estimated as the estimated distance. The estimation may be executed by the position estimation unit 218.
The registration distance calculation unit 238 determines the base station ID included in the signal strength information based on the terminal location information transmitted from the wireless terminal 40 together with the location registration request and the base station information registered in the storage unit 214. The distance between the base station corresponding to and the wireless terminal 40 is calculated as a registered distance. More specifically, the registration distance calculation unit 238 reads position information corresponding to the base station ID included in the signal strength information from the storage unit 214, and calculates a difference between the read position information and the terminal position information. To do.
The constraint condition determination unit 236 determines whether or not the estimated distance and the registered distance satisfy a predetermined constraint condition. Here, referring to FIG. 9, the relationship between the distance between the wireless terminal 40 and the base station estimated based on the signal strength received by the wireless terminal 40 and the actual distance between the wireless terminal 40 and the base station is shown. explain.
FIG. 9 is a graph showing the relationship between the distance between the wireless terminal 40 and the base station estimated based on the signal strength and the actual distance between the wireless terminal 40 and the base station. In FIG. 9, the horizontal axis represents the signal strength (RSSI: Received Signal Strength Indicator) (Dbm) of the signal transmitted from the base station, and the vertical axis represents the distance (m) between the radio terminal 40 and the base station. Show.
In FIG. 9, a curve E represents the distance between the radio terminal 40 and the base station estimated based on the signal strength. On the other hand, each plot represents the actual distance between the wireless terminal 40 and the base station. Referring to FIG. 9, it can be confirmed that the plots representing the distance between the actual wireless terminal 40 and the base station are concentrated on the lower side of the curve E and sparsely exist on the upper side of the curve E.
That is, according to FIG. 9, when the distance between the radio terminal 40 and the base station is estimated based on the signal strength, the distance is estimated to be longer than the actual case, but the distance is estimated to be shorter than the actual case. There are few. This is because the signal intensity transmitted from the base station often passes through the obstacle or is repeatedly reflected before reaching the radio terminal 40, but the signal intensity is attenuated theoretically. This is because there are few cases where the above is relaxed from the theory or the signal strength is enhanced.
Based on such distance estimation characteristics, the constraint condition determination unit 236 can make a determination using the constraint condition shown in Equation 7.
In Expression 7, dist (O, Ai) represents a distance between the position O specified by the terminal position information and the position Ai of the i-th base station registered in the storage unit 214, that is, a registered distance. Further, in Expression 7, distS (O, Ai) represents a distance between the wireless terminal 40 and the i-th base station estimated based on the signal strength information, that is, an estimated distance.
When the estimated distance and the registered distance do not satisfy Expression 7, the constraint condition determination unit 236 determines that the base station information regarding the i-th base station registered in the storage unit 214 does not satisfy the constraint condition.
Note that the constraint condition used by the constraint condition determination unit 236 is not limited to Equation 7. For example, the constraint condition determination unit 236 may use the constraint condition shown in Equation 8.
When the constraint condition shown in Formula 8 is used, the constraint condition determination unit 236 is highly likely to determine that most of the base station information does not satisfy the constraint condition together with the reception of the location registration request. As a result, the frequency of the update unit 240 (described later) updating the base station information in the storage unit 214 increases, so that the position estimation device 20 quickly reflects the actual installation status of the base station in the base station information in the storage unit 214. Can do.
The update unit 240 updates the base station information registered in the storage unit 214 determined by the base station information determination unit 230 that the constraint condition is not satisfied. For example, when the base station information determination unit 230 determines that the base station information of one base station does not satisfy the constraint condition, the update unit 240 determines that the distance between the one base station and the wireless terminal 40 is the estimated distance. The base station information of one base station registered in the storage unit 214 is updated so as to be within the range of the registered distance. Hereinafter, this will be specifically described with reference to FIG.
FIG. 10 is an explanatory diagram showing a process of updating base station information by the updating unit 240. In FIG. 10, Ai indicates the position of the i-th base station based on the base station information registered in the storage unit 214, O is the position indicated by the terminal position information, and dist (O, Ai) is signal strength information. Indicates the estimated distance between the wireless terminal 40 and the i-th base station estimated based on the above, and Aiest is the position of the end on the Ai side when dist (O, Ai) is placed on the O-Ai line from the position O Indicates. Ai indicates a position where the updating unit 240 updates the base station information of the i-th base station in the storage unit 214. Such Ai ′ can be calculated according to the following Equation 9.
In Equation 9, t is a coefficient that determines the plasticity from Ai to Ai ′, and can be changed in the range of (0 ≦ t ≦ 1). For example, if the value of t is increased, Ai ′ is closer to Ai. If the value of t is decreased, Ai ′ is separated from Ai. If the value of t is 0.5, Ai ′ is between Ai and Aiest. It becomes a point. The position estimation device 20 may be configured so that the value of the coefficient t that determines the plasticity can be changed based on user settings.
As described above, according to the base station information determination unit 230 and the update unit 240 of the position estimation device 20 according to the present embodiment, the storage unit 214 stores the position estimation request or the position registration request from the wireless terminal 40. The registered base station information can be automatically updated. Therefore, even when the installation position of the base station registered in the storage unit 214 is changed, the actual installation position of the base station can be gradually reflected in the storage unit 214.
The function as the communication unit 210 can be realized by the CPU executing a program for controlling the communication device. Further, based on a computer program for causing a computer to perform operations such as the position estimation unit 218, the registration determination unit 222, the registration unit 226, the base station information determination unit 230, or the update unit 240, a CPU, a ROM, a RAM, and the like Hardware resources can exhibit functions equivalent to the above-described configurations.
Next, a position registration method and a position update method in the position estimation device 20 will be described with reference to FIGS. 11 and 12. FIG. 11 is a flowchart showing an operation flow when the position estimation device 20 receives a position estimation request from the wireless terminal 40. FIG. 12 is a flowchart showing an operation flow when the position estimation device 20 receives a position registration request from the wireless terminal 40.
Referring to FIG. 11, first, the position estimation device 20 receives signal strength information together with a position estimation request from the wireless terminal 40 (S304). And the position estimation part 218 of the position estimation apparatus 20 estimates the position of the radio | wireless terminal 40 based on the received signal strength information (S308). Thereafter, the position estimation device 20 notifies the wireless terminal 40 of the estimated position via the communication unit 210 (S312).
Subsequently, the registration determination unit 222 of the position estimation device 20 determines whether or not each base station ID included in the signal strength information is registered in the storage unit 214 (S316). That is, the registration determination unit 222 determines whether or not the signal strength information includes the signal strength related to the unregistered base station in the storage unit 214. If it is determined in S316 that there is a base station ID included in the signal strength information that is not registered in the storage unit 214, the registration unit 226 determines that the unregistered base station ID and the position of the wireless terminal 40 Is registered in the storage unit 214 in association with the predetermined position information corresponding to (S320).
If it is determined that there is no unregistered base station ID among the base station IDs included in the signal strength information after S320 or in S316, the base station information determining unit 230 determines whether the base station information is based on the signal strength information. Then, it is determined whether or not the base station information registered in the storage unit 214 satisfies the constraint condition (S324). Then, the update unit 240 updates the base station information determined by the base station information determination unit 230 that the constraint condition is not satisfied (S328).
Referring to FIG. 12, first, the position estimation device 20 receives signal strength information and terminal position information together with a position registration request (S354). Subsequently, the registration determination unit 222 of the position estimation device 20 determines whether or not each base station ID included in the signal strength information is registered in the storage unit 214 (S358). That is, the registration determination unit 222 determines whether or not the signal strength information includes the signal strength related to the unregistered base station in the storage unit 214. In S358, when it is determined that there is an unregistered base station ID included in the signal strength information in the storage unit 214, the registration unit 226 displays the unregistered base station ID and terminal location information. The associated base station information is registered in the storage unit 214 (S362).
If it is determined that there is no unregistered base station ID among the base station IDs included in the signal strength information after S362 or in S358, the base station information determination unit 230 Based on the information, it is determined whether or not the base station information registered in the storage unit 214 satisfies the constraint condition (S366). Then, the updating unit 240 updates the base station information determined by the base station information determining unit 230 that the constraint condition is not satisfied (S370).
As described above, the position estimation system 10 according to the first embodiment of the present invention is characterized by the position estimation device 20 constituting the position estimation system 10. However, in the position estimation system 10 according to the first embodiment, it is necessary to access the position estimation apparatus 20 every time the wireless terminal 40 uses the position of the own terminal for confirmation. As a result, it may be considered that traffic between the wireless terminal 40 and the position estimation device 20 increases or it takes time until the wireless terminal 40 obtains a position estimation result.
Therefore, the second embodiment of the present invention has been made to solve the problems that may occur in the first embodiment as described above, and the position estimation system 10 according to the second embodiment of the present invention is used. According to this, traffic between the wireless terminal 40 and the position estimation device 20 can be suppressed, and the wireless terminal 40 can quickly confirm the position of the terminal itself. In such a position estimation system 10 according to the second embodiment, in addition to the position estimation device 20, the wireless terminal 40 also has a characteristic configuration. Hereinafter, the configuration of the wireless terminal 40 according to the present embodiment will be described. In addition, since the position estimation apparatus 20 concerning this embodiment has many parts which overlap with the structure demonstrated in 1st embodiment, detailed description is abbreviate | omitted.
FIG. 13 is a block diagram illustrating a configuration of the wireless terminal 40 according to the present embodiment. The wireless terminal 40 includes a communication unit 410, a measurement unit 414, a base station information storage unit 420, a position estimation unit 430, a display unit 440, a terminal position information acquisition unit 450, a history information storage unit 460, information And an update unit 470.
The communication unit 410 functions as a reception unit that receives signals (for example, beacon signals) transmitted from the surrounding base stations 30 and 31 and the like, and functions as a transmission unit that transmits history information described later to the position estimation device 20. Have The communication unit 410 may be a wireless LAN compatible communication device, a GSM compatible communication device, or a Bluetooth compatible communication device.
The measurement unit 414 measures the signal strength of the signal received by the communication unit 410 from the surrounding base stations 30 and 31 and the like. Then, the measured signal strength and the base station ID of the base station that transmitted the signal are associated with each other and output as signal strength information to position estimating section 430.
Base station information storage section 420 stores base station information in which a base station ID of a base station is associated with position information indicating the installation position of the base station. The configuration of the base station information stored in the base station information storage unit 420 is substantially the same as the base station information stored in the storage unit 214 of the position estimation device 20 described with reference to FIG.
The position estimation unit 430 receives the position of the wireless terminal 40 based on the signal strength information input from the measurement unit 414 and the base station information stored in the base station information storage unit 420 in response to a position estimation request from the user. Is estimated. The method by which the position estimation unit 430 estimates the position of the wireless terminal 40 is substantially the same as the content described in the position estimation unit 218 of the position estimation device 20 described above.
The display unit 440 is a display that displays the position of the wireless terminal 40 estimated by the position estimation unit 430 so that the user can check. Note that the display unit 440 is merely shown as an example of an output device, and the output device may be an audio output device such as a speaker or headphones.
Thus, if a database for storing base station information is provided on the wireless terminal 40 side, the wireless terminal 40 can estimate its own terminal position without accessing the position estimation device 20. However, since the actual registration status of the base station changes from moment to moment, the base station information registered in the base station information storage unit 420 of the wireless terminal 40 must also be changed in accordance with this.
The wireless terminal 40 according to the present embodiment is effective in satisfying such a request, as will be described below.
The terminal position information acquisition unit 450 acquires terminal position information indicating the current position of the wireless terminal 40.
Note that the terminal location information acquisition unit 450 does not matter how the terminal location information is acquired. For example, the terminal location information acquisition unit 450 may acquire the terminal location information based on the location registration request based on the user input. Terminal position information may be acquired based on the position estimation function. Further, when the terminal position information acquisition unit 450 acquires the terminal position information, the measurement unit 414 obtains the signal strength information together.
The history information storage unit 460 stores history information such as a history of signal strength information based on measurement by the measurement unit 414 and a history of terminal location information acquired by the terminal location information acquisition unit 450. The configuration of the history of signal strength information and the history of terminal location information will be described with reference to FIGS.
FIG. 14 is an explanatory diagram showing a history of signal strength information stored in the history information storage unit 460.
As shown in FIG. 14 (1), FIG. 14 (2), and FIG. 14 (3), the history information storage unit 460 corresponds the signal strength information at a plurality of points in time to the time when the signal strength information was obtained. In addition, it is stored as history information. Specifically, FIG. 14 (1) shows a history of signal strength information at time T1, FIG. 14 (2) shows a history of signal strength information at time T2, and FIG. 14 (3) shows signal strength information at time T3. Information history is shown. Note that the history information storage unit 460 does not necessarily store the signal strength information in association with the time.
FIG. 15 is an explanatory diagram showing a history of terminal location information stored in the history information storage unit 460. As illustrated in FIG. 15, the history information storage unit 460 stores terminal location information at a plurality of time points as history information in association with the time at which the terminal location information is obtained. Specifically, in FIG. 15, the history information storage unit 460 shows a state in which the terminal position information obtained at times T1, T2, and T3 is stored.
The history information stored in the history information storage unit 460 as described above may be transmitted to the position estimation device 20 via the communication unit 410 based on the control of the information update unit 470. When receiving the history information, the position estimation device 20 newly registers unregistered base station information in the storage unit 214 or the bases registered in the storage unit 214 as described in the first embodiment. Update station information. Then, the information update unit 470 receives the base station information currently registered in the storage unit 214 of the position estimation device 20.
Here, even if the position estimation device 20 transmits all the base station information currently registered in the storage unit 214 to the wireless terminal 40, the base station registered in the base station information storage unit 420 of the wireless terminal 40 Only the difference from the information may be transmitted. When the position estimation device 20 transmits all the base station information currently registered in the storage unit 214 to the wireless terminal 40, the information update unit 470 includes the base station information registered in the base station information storage unit 420, A difference from the received base station information in the storage unit 214 can be extracted, and the extracted contents can be reflected in the base station information storage unit 420. Alternatively, when the wireless terminal 40 receives all base station information currently registered in the storage unit 214 from the position estimation device 20, the information update unit 470 erases all the data in the base station information storage unit 420 and stores it. All base station information currently registered in the unit 214 may be newly registered.
Next, a location registration method and a location update method by the wireless terminal 40 and the location estimation system 10 according to the present embodiment will be described with reference to FIGS. 16 and 17. FIG. 16 is a flowchart showing an operation flow of the wireless terminal 40 according to the present embodiment. FIG. 17 is a sequence diagram showing a flow of operations of the position estimation system 10 according to the present embodiment.
As shown in FIG. 16, first, the radio terminal 40 initially sets base station information in the base station information storage unit 420 (S504). The initial setting is that even if the base station information registered in the storage unit 214 of the position estimation device 20 is received and the received base station information is registered in the base station information storage unit 420, the position of another base station The base station information may be received from a server that provides the base station information, and the received base station information may be registered in the base station information storage unit 420.
Subsequently, the wireless terminal 40 determines whether there is a location estimation request or a location registration request (S508). When there is a position estimation request, the wireless terminal 40 acquires signal strength information based on the operation of the measurement unit 414 (S512). Then, the position estimation unit 430 estimates the position of the wireless terminal 40 based on the signal strength information and the base station information registered in the base station information storage unit 420 (S516). Next, the measurement unit 414 or the position estimation unit 430 causes the history information storage unit 460 to store the signal strength information. (S520).
On the other hand, when there is a location registration request, the wireless terminal 40 acquires signal strength information based on the operation of the measurement unit 414 and acquires terminal location information based on the operation of the terminal location information acquisition unit 450 (S524). Subsequently, the measurement unit 414 and the terminal location information acquisition unit 450 cause the history information storage unit 460 to store the signal strength information and the terminal location information. (S528).
Subsequently, as illustrated in FIG. 17, when the history information storage unit 460 of the wireless terminal 40 stores the history information (S604), the wireless terminal 40 transmits the history information to the position estimation device 20 at a predetermined timing ( S608). Here, the predetermined timing may be when a certain amount of history information is stored, when a certain amount of time has elapsed since the previous history information transmission, or when there is a request from the position estimation device 20. .
Next, the position estimation device 20 newly registers base station information in the storage unit 214 or updates the base station information registered in the storage unit 214 based on the received history information (S612). And the position estimation apparatus 20 transmits the base station information after a change to the radio | wireless terminal 40 (S616). Subsequently, the information update unit 470 of the wireless terminal 40 extracts a difference between the received base station information and the base station information registered in the base station information storage unit 420 (S620). Thereafter, the information update unit 470 updates or changes the base station information registered in the base station information storage unit 420 based on the extracted difference (S624).
As described above, according to the position estimation device 20 according to the first embodiment of the present invention, the base station information stored in the storage unit 214 is gradually satisfied based on the signal strength information received from the radio terminal 40. Can be made. That is, the position estimation device 20 can suppress the time and effort to manually set the base station information in the position estimation device 20 and can automatically acquire the actual installation status of the base station.
Further, according to the position estimation device 20 according to the first embodiment of the present invention, the base station information registered in the storage unit 214 is automatically updated based on the operations of the base station information determination unit 230 and the update unit 240. can do. For example, even when the installation position of the base station registered in the storage unit 214 is changed, the position estimation device 20 requires human processing for the position of the base station after the change of the installation position. Without being reflected in the base station information registered in the storage unit 214.
Further, according to the wireless terminal 40 according to the second embodiment of the present invention, since the base station information storage unit 420 that stores the base station information is provided on the wireless terminal 40 side, the wireless terminal 40 includes the position estimation device 20. The own terminal position can be estimated without accessing. Furthermore, the base station information stored in the base station information storage unit 420 of the wireless terminal 40 can be changed following the base station information registered in the position estimation device 20.
For example, in the above-described embodiment, an example has been described in which the registration determination unit 222 determines whether each base station ID included in the received signal strength information is registered in the storage unit 214. However, all possible base station IDs may be registered in the storage unit 214 without associating them with location information. In this case, the registration determining unit 222 may determine whether each base station ID included in the received signal strength information is registered in the storage unit 214 in association with the position information.
Further, in the first embodiment, the example in which the position estimation device 20 and the wireless terminal 40 are separated from each other has been described. . In this case, the position estimation device 20 can receive the signal strength information of not only the wireless terminal 40 configured integrally but also other mobile terminals and update the storage unit 214.
In addition, each step in the processing of the position estimation system 10 of the present specification does not necessarily have to be processed in time series according to the order described as a flowchart or a sequence diagram, and processing (for example, executed in parallel or individually) , Parallel processing or object processing).
Also provided are a program for causing a computer to perform the location registration method or the location update method as described above, and a storage medium storing the program.
It is explanatory drawing which showed the structure of the position estimation system concerning 1st embodiment of this invention. It is the block diagram which showed the structure of the position estimation apparatus concerning the embodiment. It is explanatory drawing which showed an example of the base station information which a memory | storage part memorize | stores. It is explanatory drawing which showed an example of the signal strength information which the position estimation part received from the radio | wireless terminal. It is explanatory drawing which showed the other structural example of the position estimation system concerning the embodiment. It is explanatory drawing which showed an example of the signal strength information which the position estimation part received from the radio | wireless terminal. It is the block diagram which showed the more detailed structure of the base station information judgment part. It is explanatory drawing which showed the process of the update of base station information by an update part. It is the graph which showed the relationship between the distance between the radio | wireless terminal and base station estimated based on signal strength, and the distance between an actual radio | wireless terminal and base station. It is explanatory drawing which showed the process of the update of base station information by an update part. It is the flowchart which showed the flow of operation | movement when a position estimation apparatus receives the position estimation request | requirement from a radio | wireless terminal. It is the flowchart which showed the flow of operation | movement when a position estimation apparatus receives the position registration request | requirement from a radio | wireless terminal. It is the block diagram which showed the structure of the radio | wireless terminal which comprises the position estimation system concerning 2nd embodiment of this invention. It is explanatory drawing which showed the log | history of the signal strength information which a log | history information storage part memorize | stores. It is explanatory drawing which showed the log | history of the terminal position information which a log | history information storage part memorize | stores. 6 is a flowchart showing a flow of operations of the wireless terminal according to the embodiment. It is the sequence diagram which showed the flow of operation | movement of the position estimation system concerning the embodiment.
DESCRIPTION OF SYMBOLS 10 Position estimation system 20 Position estimation apparatus 30, 31, 32, 33 Base station 40 Wireless terminal 210, 410 Communication part 214 Storage part 218, 430 Position estimation part 222 Registration judgment part 226 Registration part 230 Base station information judgment part 232 Estimated distance Calculation unit 234 Inter-base station distance calculation unit 236 Restriction condition determination unit 238 Registration distance calculation unit 240 Update unit 414 Measurement unit 420 Base station information storage unit 440 Display unit 450 Terminal position information acquisition unit 460 History information storage unit 470 Information update unit
A storage unit in which position information of a base station that performs wireless communication with a wireless terminal and base station identification information uniquely assigned to each of the base stations are registered in association with each other;
Receive signal strength information in which the signal strength of the signal received by the wireless terminal from each base station or information obtained from the signal strength and the base station identification information of the base station that has transmitted the signal are associated with each other. With the receiver;
Whether the base station identification information included in the signal strength information received by the reception unit is registered in the storage unit in association with the position information with reference to the base station identification information registered in the storage unit A registration judgment unit for judging whether or not;
A registration unit that associates base station identification information that is determined to be unregistered in the storage unit by the registration determination unit and predetermined position information that corresponds to the position of the wireless terminal, and registers the information in the storage unit;
A position storage device comprising:
A position estimation unit that estimates the position of the wireless terminal based on the signal strength information and the position information of the base station registered in the storage unit;
The registration unit associates the base station identification information determined to be unregistered in the storage unit by the registration determination unit with the position information indicating the position of the wireless terminal estimated by the position estimation unit, and The position storage device according to claim 1, wherein the position storage device is registered in a storage unit.
The receiving unit further receives terminal position information indicating a position of the wireless terminal;
The registration unit registers the base station identification information determined to be unregistered in the storage unit by the registration determination unit and the terminal location information received by the reception unit in association with each other in the storage unit. The position storage device according to claim 1, wherein the position storage device is a feature.
The position storage device according to claim 1, wherein the reception unit receives the signal strength information at one or more time points stored in the wireless terminal.
Base station information for determining whether position information of the base station registered in the storage unit satisfies a predetermined constraint condition based on a distance between the wireless terminal and the base station estimated from the signal strength information With the decision part;
An updating unit that updates the location information of the base station that is determined by the base station information determining unit not to satisfy the predetermined constraint;
The base station information determination unit
The distance between the first base station and the second base station that perform wireless communication with the wireless terminal is based on the position information of the first base station and the second base station registered in the storage unit. A base station distance calculation unit to calculate;
An estimated distance addition unit that adds the distance between the wireless terminal and the first base station, and the distance between the wireless terminal and the second base station, estimated from the signal strength information;
A constraint condition determination unit that determines that the constraint condition is not satisfied when there is a difference between the distance calculated by the inter-base station distance calculation unit and the distance calculated by the estimated distance addition unit;
The position storage device according to claim 5, comprising:
The constraint condition determination unit determines that the constraint condition is not satisfied when the distance calculated by the inter-base station distance calculation unit is longer than a distance calculated by the estimated distance addition unit by a set boundary value or more. The position storage device according to claim 6, wherein the position storage device is a feature.
The update unit has a distance between the first base station and the second base station,
A distance between a position indicated by the position information of the first base station registered in the storage unit and a position indicated by the position information of the second base station;
A distance obtained by adding a distance between the wireless terminal and the first base station and a distance between the wireless terminal and the second base station;
The position storage device according to claim 6, wherein the position information of the base station registered in the storage unit is updated so as to fall within a range of
A registered distance calculation unit that calculates a distance between the position indicated by the terminal position information received by the reception unit and the position indicated by the position information of one base station registered in the storage unit;
When there is a difference between the distance calculated by the registered distance calculation unit and the distance between the wireless terminal and the one base station estimated based on the signal strength corresponding to the one base station, the restriction A constraint condition determination unit that determines that the condition is not satisfied;
The position storage device according to claim 5, further comprising:
The constraint condition determination unit is configured such that the distance calculated by the registered distance calculation unit is shorter than the distance between the wireless terminal and the one base station estimated based on the signal strength corresponding to the one base station. The position storage device according to claim 9, wherein it is determined that the constraint condition is not satisfied.
The update unit has a distance between the one base station and the wireless terminal,
A distance between a position indicated by the terminal position information received by the receiving unit and a position indicated by position information of one base station registered in the storage unit;
A distance between the wireless terminal and the one base station estimated based on the signal strength information;
The position storage device according to claim 10, wherein the position information of the base station registered in the storage unit is updated so as to fall within the range of the base station.
The position storage device according to claim 5, wherein the reception unit receives the signal strength information at one or more time points stored in the wireless terminal.
A wireless terminal that performs wireless communication with a plurality of base stations,
A measurement unit for measuring signal strength of signals received from the plurality of base stations;
The signal strength information at one or more time points in which the signal strength measured by the measurement unit or the information obtained from the signal strength is associated with the base station identification information uniquely given to each of the base stations. A history information storage unit for storing history;
A transmission unit that transmits the history of the signal strength information stored in the history information storage unit to a position storage device that can estimate the position of the wireless terminal based on the signal strength information;
A base station information storage unit in which base station information in which position information of the plurality of base stations is associated with the base station identification information is registered;
A position estimation unit that estimates the position of the wireless terminal based on the base station information and the signal strength information registered in the base station information storage unit;
The wireless terminal according to claim 13, further comprising:
The history information storage unit is further registered with a history of terminal location information indicating the location of the wireless terminal at one or more time points,
The wireless terminal according to claim 13, wherein the transmission unit transmits the signal strength information and the history of the terminal location information to the location storage device.
Base station information registered in the base station information storage unit, position information of a plurality of base stations registered in the storage unit of the position storage device, and base station identification uniquely given to each of the base stations The wireless terminal according to claim 13, further comprising an information update unit configured to update base station information associated with information.
A position storage system including a wireless terminal that performs wireless communication with a plurality of base stations, and a position storage device in which positions of the plurality of base stations are registered:
Signal strength information at one or more time points in which the signal strength measured by the measurement unit or information obtained from the signal strength is associated with base station identification information uniquely given to each of the base stations. A transmitter for transmitting to the position storage device;
The position storage device includes:
A storage unit in which the position information of the base station and the base station identification information are registered in association with each other;
A receiving unit for receiving the signal strength information from the wireless terminal;
A registration determination unit that refers to the base station identification information registered in the storage unit and determines whether the base station identification information included in the signal strength information received by the reception unit is registered in the storage unit When;
A position storage system comprising:
Registering, in a storage medium, location information of a base station that performs wireless communication with a wireless terminal and base station identification information uniquely assigned to each of the base stations in association with each other;
Receiving signal strength information in which signal strength of a signal received by the wireless terminal from the base station or information obtained from the signal strength is associated with base station identification information of a base station that has transmitted the signal; ;
Referring to base station identification information registered in the storage medium and determining whether base station identification information included in the received signal strength information is registered in the storage medium;
Registering in the storage medium the base station identification information determined to be unregistered in the storage medium and predetermined position information corresponding to the position of the wireless terminal in association with each other;
The location registration method characterized by including.
Determining whether the position information of the base station registered in the storage medium satisfies a predetermined constraint condition based on a distance between the wireless terminal and the base station estimated from the signal strength information;
Updating location information of a base station determined not to satisfy the predetermined constraint;
A location update method comprising:
The signal intensity of the signal received by the radio terminal from each base station that performs radio communication with the radio terminal or information obtained from the signal intensity is associated with the base station identification information of the base station that transmitted the signal A receiver for receiving signal strength information;
Reference is made to the base station identification information registered in the storage medium in association with the position information of the base station, and the base station identification information included in the signal strength information received by the receiving unit is registered in the storage medium. A registration judgment unit for judging whether or not;
A registration unit that associates the base station identification information determined to be unregistered with the storage medium by the registration determination unit and predetermined position information according to the position of the wireless terminal, and registers the information with the storage medium;
A program for causing a position storage device to function.
Signal strength of a signal received by the wireless terminal from each base station that performs wireless communication with the wireless terminal or information obtained from the signal strength is associated with base station identification information of the base station that transmitted the signal A receiver for receiving signal strength information;
Predetermined constraints based on the distance between the radio terminal and the base station obtained from the signal strength information, the position information of the base station registered in a storage medium in association with the base station identification information of the base station A base station information determination unit for determining whether or not a condition is satisfied;
JP2006285558A 2006-10-19 2006-10-19 Location storage device, wireless terminal, location storage system, location registration method, location update method, and program Active JP4957174B2 (en)
JP2006285558A JP4957174B2 (en) 2006-10-19 2006-10-19 Location storage device, wireless terminal, location storage system, location registration method, location update method, and program
TW096133985A TWI344548B (en) 2006-10-19 2007-09-12
CA2666802A CA2666802C (en) 2006-10-19 2007-10-09 Location storage device, wireless terminal, location storage system, location registration method, location update method and program
KR1020097007789A KR101267947B1 (en) 2006-10-19 2007-10-09 Position storage device, radio terminal, position storage system, position registering method, position update method, and program
PCT/JP2007/069662 WO2008047628A1 (en) 2006-10-19 2007-10-09 Position storage device, radio terminal, position storage system, position registering method, position update method, and program
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JP2006285558A Active JP4957174B2 (en) 2006-10-19 2006-10-19 Location storage device, wireless terminal, location storage system, location registration method, location update method, and program
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