JP2011043479A - Mobile communication terminal, positioning system, positioning method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication terminal capable of suppressing a power consumption by positioning processing. <P>SOLUTION: The mobile communication terminal 10 includes: a communication unit 18 for performing radio communication with a base station; a handover execution unit 13 for executing handover processing for switching a communication target of the communication unit 18 from one base station to another base station; a GPS positioning unit 11; a sector positioning unit 12 for acquiring positioning information intermittently, by a method having lower positioning accuracy with a smaller power consumption than the GPS positioning unit 11; and a positioning control unit 14 for driving either of the GPS positioning unit 11 and the sector positioning unit 12 as an acquisition target of the positioning information, and reducing the power consumption on the other side, or changing a frequency for acquiring the positioning information, based on frequency information showing a frequency in which the handover processing is executed by the handover execution unit 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mobile communication terminal, a positioning system, a positioning method, and a program.

  In recent years, services using location information of mobile communication terminals have been widely spread. In addition, it has evolved into a service that grasps the location of the user in real time and makes use of the information. In order to grasp the position at all times, the GPS function of the mobile communication terminal may be always activated, but enormous power is required to perform GPS positioning. On the other hand, miniaturization and thinning are important in mobile communication terminals, and it is difficult to mount a battery with a large capacity, so it is important to reduce power consumption and extend battery life. ing.

  As this type of technology, Patent Document 1 (Japanese Patent Laid-Open No. 10-281801) describes the following system. In this system, positioning by GPS, positioning by a radio base station, and positioning by a radio wave marker are appropriately switched, and the position of the mobile communication terminal can be always measured. In addition, when positioning cannot be performed by the positioning method described above, the moving direction and moving speed are calculated from the positioning information history, information obtained from the acceleration sensor installed in the mobile communication terminal, and the like, The position can also be predicted.

  As this type of technology, Patent Document 2 (Japanese Patent Laid-Open No. 2008-180582) describes the following system. When receiving an incoming radio wave from a base station located far from a set destination, this system specifies the position of the mobile communication terminal from the position of the base station. In addition, when receiving an incoming radio wave from a base station located near a set destination, this system measures the position of the mobile communication terminal by a positioning method using GPS. Thereby, when the mobile communication terminal exists at a position far from the destination, the power consumption of the mobile communication terminal is reduced.

JP-A-10-281801 JP 2008-180582 A

  However, the above technique has room for improvement in the following points. Since the technique described in Patent Document 1 allows a plurality of positioning methods to function simultaneously, the power consumption of the mobile communication terminal increases. Further, the technique described in Patent Document 2 cannot be used without setting a destination.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a mobile communication terminal, a positioning system, a positioning method, and a program capable of suppressing power consumption due to positioning processing.

  According to the present invention, a communication unit that wirelessly communicates with a base station, a handover execution unit that executes a handover process for switching a communication destination of the communication unit from one base station to another base station, and the position of the own device First positioning means for intermittently acquiring the positioning information shown, and second positioning means for intermittently acquiring the positioning information by a method having lower positioning accuracy and lower power consumption than the first positioning means; Based on the frequency information indicating the frequency at which the handover process is executed by the handover execution means, one of the first positioning means and the second positioning means is activated as an acquisition source of the positioning information, And a positioning control means for changing the frequency of acquiring the positioning information. A mobile communication terminal is provided.

  Further, according to the present invention, the first positioning means for causing the mobile communication terminal to intermittently acquire positioning information indicating the position of the mobile communication terminal, and the positioning accuracy is lower than that of the first positioning means. A second positioning means for causing the mobile communication terminal to intermittently acquire the positioning information and a communication destination of the mobile communication terminal from one base station to another base station by a method with low power consumption of the terminal Based on frequency information indicating a frequency at which the handover process is executed by the handover execution unit, one of the first positioning unit and the second positioning unit is changed to the handover execution unit that executes the handover process. Positioning control means that is activated as an acquisition source of positioning information and reduces the other power consumption, or changes the frequency with which the mobile communication terminal acquires the positioning information; Positioning system, characterized in that it comprises is provided.

  Furthermore, according to the present invention, the first positioning means for causing the mobile communication terminal to intermittently acquire the positioning information indicating the position of the mobile communication terminal, and the positioning accuracy is lower than that of the first positioning means. A positioning step for causing the mobile communication terminal to acquire the positioning information using any one of the second positioning means for causing the mobile communication terminal to intermittently acquire the positioning information by a method with low power consumption of the terminal; A handover execution step for executing a handover process for switching the communication destination of the mobile communication terminal from one base station to another base station, and frequency information indicating a frequency at which the handover process is executed in the handover execution step. Then, one of the first positioning means and the second positioning means is activated as the positioning means used in the positioning step, and the other power consumption Positioning method the mobile communication terminal with reduced thereby or the positioning step, is characterized in that it comprises a positioning control step of changing the frequency of acquiring the positioning information is provided.

  Furthermore, according to the present invention, a program stored in a computer-readable storage medium, communication processing for wirelessly communicating with a base station, and a communication destination in the communication processing from one base station to another base station The positioning information by a handover process for switching to, a first positioning process for intermittently obtaining positioning information indicating the position of the own device, and a method with lower positioning accuracy and lower power consumption than the first positioning process. Based on frequency information indicating the frequency at which the handover process is executed and the second positioning process that intermittently acquires the first handover process, either the first positioning process or the second positioning process is selected and executed. And a positioning control process for reducing the other power consumption or changing the frequency of acquiring the positioning information. It is.

  According to the present invention, a mobile communication terminal, a positioning system, a positioning method, and a program capable of suppressing power consumption due to positioning processing are provided.

It is a lineblock diagram of a positioning system concerning an embodiment of the invention. It is a sequence diagram regarding the positioning process by a GPS positioning part. It is a sequence diagram regarding the positioning process by a sector positioning part. It is a block diagram of the mobile communication terminal of this embodiment. It is a sequence diagram regarding a handover process. It is a figure which shows an example of the data table memorize | stored in a communication history memory | storage part. It is a flowchart including the positioning process in the positioning system of this embodiment. It is a flowchart including the handover process in the positioning system of this embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

  FIG. 1 is a configuration diagram of a positioning system 100 according to an embodiment of the present invention. The positioning system 100 of this embodiment includes a mobile communication terminal 10 that performs radio communication with a base station 30, a base station 40, or a base station 50. The mobile communication terminal 10 functions as a GPS receiver and can calculate the position of the mobile communication terminal 10 using the GPS satellite 60, the GPS satellite 70, or the GPS satellite 80. Note that the GPS satellite 60, the GPS satellite 70, or the GPS satellite 80 is a satellite used for positioning processing by GPS (Global Positioning System).

  In addition, the positioning system 100 obtains the position of the base station that communicates with the mobile communication terminal 10 or the sector information indicating the communication area of the base station as the positioning information of the mobile communication terminal 10, and obtains the obtained positioning information as the mobile communication terminal. 10 is provided. In addition, although the mobile communication terminal 10 calculates positioning information using GPS, it is lower in the positioning accuracy to acquire the sector information obtained by the positioning device 20 as positioning information, but the mobile communication terminal 10 bears it. Less power consumption. Here, the positioning accuracy is the size of the narrowing-down range of the position of the mobile communication terminal 10 that is the positioning target. The positioning information calculated by the mobile communication terminal 10 using the GPS can be limited to an area narrower than the sector information calculated by the positioning device 20, and can indicate the position of the mobile communication terminal 10.

  FIG. 2 is a configuration diagram of the mobile communication terminal 10 of the present embodiment. The mobile communication terminal 10 includes a GPS positioning unit 11, a sector positioning unit 12, a handover execution unit 13, a positioning control unit 14, a communication history storage unit 15, a base station information acquisition unit 16, an antenna 17, and a communication unit 18.

  The communication unit 18 wirelessly communicates with the base stations 30, 40 and 50. More specifically, the communication unit 18 transmits and receives radio signals to and from the base stations 30, 40 and 50 via the antenna 17.

The GPS positioning unit 11 (first positioning means) performs positioning processing using GPS, and intermittently acquires positioning information indicating the position of the own device (mobile communication terminal 10). Regarding the positioning processing by the GPS positioning unit 11, here, “intermittent” may be a fixed time interval or an indefinite time interval. In the present embodiment, the GPS positioning unit 11 acquires the positioning information for each set time t ₁ set by the positioning control unit 14. That, GPS positioning unit 11 executes the positioning process for each set time _{t 1.}

  This will be described in detail with reference to the sequence diagram of FIG. Note that the GPS satellites described in the sequence diagram of FIG. 3 are each of the GPS satellite 60, the GPS satellite 70, and the GPS satellite 80, and each GPS satellite is a process described in the sequence of FIG. Shall be executed.

First, GPS positioning unit 11, when the set time t ₁ elapses after executing the positioning process again starts positioning processing (step T1). Then, the GPS positioning unit 11 receives the positioning signal from the GPS signal (step T2), and based on the reception time received in step T2 and various information embedded in the positioning signal, the mobile communication terminal 10 The position is calculated (step T3).

The sector positioning unit 12 (second positioning means) intermittently acquires the sector information described above as the positioning information of the mobile communication terminal 10. Here, intermittent may be a fixed time interval or an indefinite time interval. In the present embodiment, the sector positioning unit 12 acquires the positioning information for each set time t ₂ set by the positioning control unit 14. That is, the positioning device 20 transmits the sector information to a sector positioning unit 12 every time setting t _2. The set time t ₁ and the set time t ₂ may be the same or different values.

The positioning process by the sector positioning unit 12 will be described with reference to the sequence diagram of FIG. First, the sector positioning unit 12 obtains sector information corresponding to a base station with which the mobile communication terminal 10 is currently performing radio communication when the set time t _{2 has} elapsed since receiving positioning information (sector information). (Step T11). Subsequently, the positioning device 20 specifies a base station that is wirelessly communicating with the mobile communication terminal 10 that has requested the sector information, and searches the database for sector information corresponding to the specified base station (step T12). Then, the positioning device 20 transmits the specified sector information as positioning information to the sector positioning unit 12 (step T13).

  The handover execution unit 13 executes a handover process for switching the communication destination of the communication unit 18 (mobile communication terminal 10) from one base station to another base station. The handover process will be described in detail with reference to the sequence diagram of FIG. Here, the communication destination before the handover process is the base station 30, and the communication destination after the handover process is the base station 40.

  First, the base station 30 and the base station 40 transmit RS (Reference Symbol) to the mobile communication terminal 10 (steps T21 and T22). Next, the mobile communication terminal 10 measures at least one of RSRP (Reference Signal Received Power) or RSRQ (Reference Signal Received Quality) based on the received RS (step T23). Here, RSRP is so-called reference signal reception power, and in this embodiment, is reception power of the received RS. RSRQ is so-called reference signal reception quality, and in this embodiment, is a ratio of received power of the received RS and noise power received in the same frequency band.

  In addition, the base station 30 transmits UL (Up Link) Grant to the mobile communication terminal 10 (step T24), and the mobile communication terminal 10 transmits Measurement Report in response to the UL Grant (step T25). The Measurement Report is a signal obtained by multiplexing the RSRP or RSRQ measured in Step T23 on the resource corresponding to the UL Grant.

  Furthermore, the base station 30 receives the RSRP or RSRQ between the base station 30 and the mobile communication terminal 10 and the RSRP or RSRQ between the base station 40 and the mobile communication terminal 10 from the Measurement Report received in step T25. Is extracted and acquired (step T26). Then, the base station 30 compares the information acquired in step T26 (step T27), and when it is determined that RSRP or RSRQ between the base station 40 and the mobile communication terminal 10 is better, the base station 30 30 determines to cause the mobile communication terminal 10 to execute a handover process from the base station 30 to the base station 40 (step T28). Then, the base station 30 transmits a handover process request (HO Request) to the base station 40 (Step T29), and the base station 40 transmits a handover process request confirmation (HO Request ACK) to the base station 30 (Step T30). ). Next, the base station 30 transmits a handover processing command (HO Command) to the mobile communication terminal 10 (step T31), and the mobile communication terminal 10 transmits a handover processing command confirmation (HO Command ACK) to the base station 30. (Step T32). Then, the mobile communication terminal 10 (handover execution unit 13) executes a handover process from the base station 30 to the base station 40 (step T33).

  The communication history storage unit 15 stores base station information indicating a base station with which the communication unit 18 (mobile communication terminal 10) communicates wirelessly. The communication history storage unit 15 stores time information indicating the time when the base station information is acquired. Here, the timing for acquiring the base station information is preferably when it is notified that the handover process to the base station indicated by the base station information is completed, but is not limited to this, and the mobile communication terminal 10 and the base station As long as the communication connection is established. FIG. 6 shows an example of a data table stored in the communication history storage unit 15.

  The base station information acquisition unit 16 acquires part or all of the base station information stored in the communication history storage unit 15. More specifically, the base station information acquisition unit 16 acquires the base station information stored in the communication history storage unit 15 during the time required to execute a predetermined number of handover processes. Here, the processing of the base station information acquisition unit 16 when the predetermined number of times is three will be specifically described with reference to the data table of FIG. The base station information acquisition unit 16 acquires the base station information retroactively three times including the latest base station information in the data table (base station information No. 1 to No. 3 in FIG. 6). At this time, no. 1 time information and No. 1 3 is the time required for executing the handover process a predetermined number of times. The predetermined number of times is desirably three times or more.

  The positioning control unit 14 activates one of the GPS positioning unit 11 and the sector positioning unit 12 as an acquisition source of positioning information based on the frequency information indicating the frequency at which the handover process is executed by the handover executing unit 13, Reduce power consumption. Here, reducing the power consumption may be stopping the GPS positioning unit 11 or the sector positioning unit 12 or may be in a standby mode. By setting the standby mode, it is possible to start up relatively quickly according to the control from the positioning control unit 14.

  More specifically, when the base station information acquired by the base station information acquisition unit 16 is all different and when the time required for executing a predetermined number of handover processes is less than a threshold, the positioning control unit 14 The unit 12 is activated as a positioning information acquisition source. In addition, when part of the base station information acquired by the base station information acquisition unit 16 matches, or when the time required for executing the predetermined number of times of handover processing is equal to or greater than a threshold value, the positioning control unit 14 The unit 11 is activated as a positioning information acquisition source.

  All or part of the configuration included in the mobile communication terminal 10 may be realized by hardware, or may be realized by a program (or program code) that causes a processor to execute processing.

  When the configuration included in the mobile communication terminal 10 is implemented by a program, the program is stored in a processor (computer) readable storage medium. Then, the program causes the processor to execute communication processing for wireless communication with the base station. The program also causes the processor to execute a handover process for switching the communication destination in the communication process from one base station to another base station. Then, the program causes the processor to execute a first positioning process (positioning process by the GPS positioning unit 11) that intermittently acquires positioning information indicating the position of the own device. Then, the program executes the second positioning process (positioning process by the sector positioning unit 12) for intermittently acquiring the positioning information to the processor in a method with lower positioning accuracy and lower power consumption than the first positioning process. Let Then, the program selects and executes either the first positioning process or the second positioning process based on the frequency information indicating the frequency at which the handover process is executed, or reduces the power consumption of the other, or A processor is caused to execute a positioning control process for changing a frequency of acquiring positioning information.

FIG. 7 is a flowchart including a positioning process in the positioning system 100 of the present embodiment. This flowchart includes a positioning step (step S1) for acquiring positioning information of the mobile communication terminal 10 using either the GPS positioning unit 11 or the sector positioning unit 12. Incidentally, after the step S1 is executed, (NO in step S2) while no set time has elapsed t ₁ or the set time t ₂ is in a standby mode, when t ₂ has passed the set time t ₁ or set time (step S2 Step S1 is executed again. Whether the set time t ₁ or the set time t ₂ is used depends on whether the positioning means used in step S1 is the GPS positioning unit 11 or the sector positioning unit 12.

  In this flowchart, step S1 and step S2 are repeated while positioning of the mobile communication terminal 10 is continued (NO in step S3). Further, when the positioning of the mobile communication terminal 10 is finished (YES in step S3), this flowchart is finished.

  FIG. 8 is a flowchart including a handover process in the positioning system 100 of the present embodiment. This flowchart shows a handover execution step for executing a handover process (step S12) when a handover process for switching the communication destination of the mobile communication terminal 10 from one base station to another base station is executed (YES in step S11). Is provided. This flowchart is in a standby state while the handover process is not executed (NO in step S11).

  Also, in this flowchart, in the communication history storage step (step S13), base station information indicating the base station with which the mobile communication terminal 10 has performed wireless communication is stored. In the base station information acquisition step (step S14), when the time required for executing the predetermined number of times of handover processing is less than the threshold value, the base station information stored in step S13 during the above time is acquired.

  When all the base station information acquired in step S14 is different, in the positioning control step (step S16), the GPS positioning unit 11 or the sector positioning unit 12 is based on the frequency information indicating the frequency at which the handover process is executed in step S12. Is activated as a positioning means used in the positioning step (step S1 in FIG. 7), and the power consumption of the other is reduced. More specifically, when all the base station information acquired in step S14 is different (YES in step S15), in step S16, a positioning step (in FIG. 7) is performed according to the time required for executing a predetermined number of handover processes. The positioning means used in step S1) is selected from either the GPS positioning unit 11 or the sector positioning unit 12. When part of the base station information acquired in step S14 matches (NO in step S15), the standby state is entered until the handover process is executed again.

  In this flowchart, steps S11 to S16 are repeated while the mobile communication terminal 10 continues wireless communication (NO in step S17). Further, when the mobile communication terminal 10 ends the wireless communication (YES in step S17), this flowchart ends.

  Here, the effect of this embodiment will be described. In the present embodiment, the accuracy of the positioning information acquired by the mobile communication terminal 10 (positioned by the positioning device 20) can be changed according to the frequency with which the handover process is executed. Thereby, when the frequency of the handover process is high, it is inferred that the mobile communication terminal 10 is moving at a high speed. Therefore, the mobile communication terminal 10 receives positioning information from the sector positioning unit 12 with low positioning accuracy and low power consumption. Can be controlled to get. In addition, when the frequency of the handover process is low, it is assumed that the mobile communication terminal 10 is moving at a low speed, so the mobile communication terminal 10 acquires the positioning information from the GPS positioning unit 11 with high positioning accuracy and high power consumption. Can be controlled.

  In addition, the present embodiment refers to the base station information that has been traced a predetermined number of times from the latest base station information, and when there is no matching base station information, the mobile communication terminal 10 acquires (the positioning device 20 is Change the accuracy of positioning information. Thereby, in the case where the mobile communication terminal 10 is not moving when the mobile communication terminal 10 is not moving, for example, when the mobile communication terminal 10 is in a position straddling the communicable area of a plurality of base stations, the control condition of the positioning control unit 14 is included. I can't. Therefore, the possibility that the positioning control unit 14 performs control contrary to the actual situation is reduced.

  Further, in the present embodiment, the frequency of handover processing is set as a control condition. Since the handover process is a process that is generally executed if the mobile communication terminal is a mobile phone, PHS, or the like, there is no need to add an auxiliary component such as an acceleration sensor to the mobile communication terminal 10, and the processing load and consumption Electricity is also reduced.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

  Although three GPS satellites are shown in FIG. 1, four or more GPS satellites may be used. Also, although three base stations are shown in the figure, there may be two base stations or four or more base stations.

  The procedure of the GPS positioning process, the sector information positioning process, and the handover process described with reference to the sequence diagrams of FIGS. 2, 3, and 5 is an example, and is not limited to this procedure.

  In the above embodiment, the first positioning means of the present invention is the GPS positioning unit 11, and the second positioning means is the sector positioning unit 12. However, the first positioning means and the second positioning means of the present invention are different from each other. It does not necessarily have to be a different component. For example, both may be positioning means using GPS, and the positioning means may change the accuracy of positioning information and the power consumption of the mobile communication terminal by selecting a mode.

  In the above embodiment, the GPS positioning unit 11 calculates and acquires positioning information using GPS, but may acquire positioning information calculated by another device. In the above embodiment, the sector positioning unit 12 acquires the sector information obtained by the positioning device 20 as the positioning information. However, the sector information obtained by the sector positioning unit 12 may be obtained as the positioning information.

In said embodiment, the positioning control part 14 switches the GPS positioning part 11 and the sector positioning part 12 based on frequency information, and changes the positioning accuracy of the positioning information to acquire. However, the positioning control unit 14 may change the frequency of acquiring the positioning information (the positioning device 20 outputs the positioning information) based on the frequency information. More specifically, the positioning control unit 14 may increase the values of the set time t ₁ and the set time t ₂ as the frequency of the handover process executed by the handover executing unit 13 increases. Further, the positioning control unit 14 may decrease the values of the set time t ₁ and the set time t ₂ as the frequency with which the handover process is executed by the handover executing unit 13 is reduced. Even if it processes in this way, the power consumption of the mobile communication terminal 10 can be suppressed.

  In the above embodiment, when all the base station information acquired by the base station information acquisition unit 16 is different and when the time required for executing the predetermined number of times of handover processing is less than the threshold value, the positioning control unit 14 It has been described that the positioning unit 12 is activated as an acquisition source of positioning information. However, the operating condition of the positioning control unit 14 is not limited to this. For example, among the base station information acquired by the base station information acquisition unit 16, when the overlapping base station information is less than a predetermined number, and when the time required for executing a predetermined number of handover processes is less than a threshold, The positioning control unit 14 may activate the sector positioning unit 12 as an acquisition source of positioning information.

  Naturally, the positioning control unit 14 may change both the accuracy of the positioning information to be acquired and the frequency at which the positioning information is acquired based on the frequency information.

  In the above embodiment, the frequency information has been described only for the case indicated by the time required for executing the predetermined number of times of handover processing. However, the frequency information is not limited to this. For example, the frequency information may be the number of times the handover process is executed within a predetermined period, or the time difference between the time when the first handover process is executed and the time when the second handover process is executed. A plurality of information listed here may be combined.

  In the description of the above embodiment, a plurality of flowcharts are used, and a plurality of steps are described in order. The order of description indicates the order in which the steps of the positioning method of the present invention are executed. It is not limited. For this reason, when the positioning method of the present invention is executed, the order of the plurality of steps can be changed within a range that does not hinder the contents.

  Needless to say, the above-described embodiment and a plurality of modifications can be combined within a range in which the contents do not conflict with each other. Moreover, although the functions and the like of each component have been specifically described in the above-described embodiments and modifications, the functions and the like can be changed in various ways within a range that satisfies the present invention.

DESCRIPTION OF SYMBOLS 10 Mobile communication terminal 11 Positioning part 12 Sector positioning part 13 Handover execution part 14 Positioning control part 15 Communication history memory | storage part 16 Base station information acquisition part 17 Antenna 18 Communication part 20 Positioning apparatus 30 Base station 40 Base station 50 Base station 60 GPS satellite 70 GPS satellites 80 GPS satellites 100 Positioning system

Claims (11)

A communication means for wirelessly communicating with a base station;
A handover execution means for executing a handover process for switching a communication destination of the communication means from one base station to another base station;
First positioning means for intermittently acquiring positioning information indicating the position of the own device;
Second positioning means for intermittently acquiring the positioning information in a method having lower positioning accuracy and lower power consumption than the first positioning means;
Based on frequency information indicating the frequency at which the handover process is executed by the handover execution means, either the first positioning means or the second positioning means is activated as the acquisition source of the positioning information, and the other Positioning control means for reducing power consumption or changing the frequency of acquiring the positioning information;
A mobile communication terminal comprising: The mobile communication terminal according to claim 1,
The frequency information includes the number of times the handover process is executed within a predetermined period, the time difference between the time when the first handover process is executed and the time when the second handover process is executed, or a predetermined number of the handover processes. A mobile communication terminal characterized in that it is indicated by at least one of the time required for execution of. The mobile communication terminal according to claim 2, wherein
The positioning control means includes
When the time required for executing the handover process a predetermined number of times is less than a threshold value, the second positioning means is activated as an acquisition source of the positioning information,
A mobile communication terminal, wherein when the time is equal to or greater than the threshold, the first positioning means is activated as an acquisition source of the positioning information. The mobile communication terminal according to claim 3, wherein
Communication history storage means for storing base station information indicating the base station with which the communication means wirelessly communicated;
Base station information acquisition means for acquiring a part or all of the base station information stored in the communication history storage means,
Among the base station information acquired by the base station information acquisition means, when the overlapping base station information is less than a predetermined number and the time is less than the threshold, the positioning control means A mobile communication terminal, wherein two positioning means are activated as an acquisition source of the positioning information. First positioning means for causing the mobile communication terminal to intermittently acquire positioning information indicating the position of the mobile communication terminal;
Second positioning means for causing the mobile communication terminal to intermittently acquire the positioning information in a method having lower positioning accuracy than the first positioning means and less power consumption of the mobile communication terminal;
Handover executing means for executing a handover process for switching the communication destination of the mobile communication terminal from one base station to another base station;
Based on frequency information indicating the frequency at which the handover process is executed by the handover execution means, either the first positioning means or the second positioning means is activated as the acquisition source of the positioning information, and the other Positioning control means for reducing power consumption or changing the frequency with which the mobile communication terminal acquires the positioning information;
A positioning system comprising: The positioning system according to claim 5, wherein
The frequency information includes the number of times the handover process is executed within a predetermined period, the time difference between the time when the first handover process is executed and the time when the second handover process is executed, or a predetermined number of the handover processes. A positioning system characterized in that it is indicated by at least one of the time required for execution. The positioning system according to claim 6,
The positioning control means includes
When the time required for executing the handover process a predetermined number of times is less than a threshold value, the second positioning means is activated as an acquisition source of the positioning information,
When the said time is more than the said threshold value, the said 1st positioning means is started as an acquisition source of the said positioning information, The positioning system characterized by the above-mentioned. The positioning system according to claim 7,
Communication history storage means for storing base station information indicating the base station with which the mobile communication terminal has performed wireless communication;
Base station information acquisition means for acquiring a part or all of the base station information stored in the communication history storage means,
Among the base station information acquired by the base station information acquisition means, when the overlapping base station information is less than a predetermined number and the time is less than the threshold, the positioning control means A positioning system, wherein two positioning means are activated as an acquisition source of the positioning information. A first positioning means for causing the mobile communication terminal to intermittently acquire positioning information indicating the position of the mobile communication terminal; and a method with lower positioning accuracy than the first positioning means and less power consumption of the mobile communication terminal. A positioning step for causing the mobile communication terminal to acquire the positioning information using any one of the second positioning means for causing the mobile communication terminal to intermittently acquire the positioning information;
A handover execution step of executing a handover process for switching the communication destination of the mobile communication terminal from one base station to another base station;
Based on the frequency information indicating the frequency at which the handover process is executed in the handover execution step, the positioning means used in the positioning step activates either the first positioning means or the second positioning means, while A positioning control step that reduces the power consumption of the mobile communication terminal or changes the frequency at which the mobile communication terminal acquires the positioning information in the positioning step;
A positioning method characterized by comprising: The positioning method according to claim 9, wherein
A communication history storage step for storing base station information indicating the base station with which the mobile communication terminal has performed wireless communication;
A base station information acquisition step of acquiring a part or all of the base station information stored in the communication history storage step,
Among the base station information acquired in the base station information acquisition step, when the overlapping base station information is less than a predetermined number and the time is less than the threshold, in the positioning control step, 2. A positioning method, wherein two positioning means are activated as an acquisition source of the positioning information. A program stored in a computer-readable storage medium,
Communication processing for wireless communication with a base station;
A handover process for switching a communication destination in the communication process from one base station to another base station;
A first positioning process for intermittently acquiring positioning information indicating the position of the own machine;
A second positioning process for intermittently acquiring the positioning information in a method with lower positioning accuracy and lower power consumption than the first positioning process;
Based on frequency information indicating the frequency at which the handover process is executed, the process for obtaining the positioning information is performed by executing either the first positioning process or the second positioning process, thereby reducing the power consumption of the other. A positioning control process for changing the frequency of acquiring the positioning information, or
That causes the computer to execute the program.

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