JP2010098422A - Position detection system and mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate counting of the number of terminals and specification of positions by avoiding interference between search signals that a plurality of terminals transmit. <P>SOLUTION: A radio exchange 1 generates search signal setting information, specifying at least one of a transmission frequency, transmission timing, and a transmission output value of the search signal for each of mobile phone terminals 3-2 and 3-3. A radio base station 2 transmits the search signal setting information to the mobile phone terminal 3-2 and 3-3 at setting destinations to request them to transmit a search signal. The mobile phone terminals 3-2 and 3-3 transmit search signals M-4-a and M-4-b with the transmission frequency, transmission timing, and transmission output value specified with the search signal setting information. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a position detection system for specifying the position of a mobile terminal carried by a person, for example, at the time of a disaster, and a mobile terminal used in the position detection system.

When rescuing a person (stricken person) who is alive and buried in a building collapsed due to the occurrence of a disaster such as an earthquake, it is urgent to specify the presence and location of the victim. There are the following methods to search for victims.
(1) Identify the location of the victim using communication such as conversation with the victim.
(2) Search for victims using rescue dogs or small cameras.
(3) Search for a victim using a mobile terminal owned by the victim.

  For example, Patent Literature 1 and Patent Literature 2 disclose methods for searching for a victim using a mobile terminal. In the position detection system disclosed in Patent Document 1, an emergency radio signal is transmitted from a plurality of radio base stations to a mobile terminal in response to an instruction from the radio exchange station. Is converted into an acoustic signal (Morse signal or DTMF signal) and the acoustic signal is output at a high volume. This acoustic signal makes it possible to identify the victim and their location.

  Further, in the system disclosed in Patent Document 2, a control signal for transmitting an emergency signal from a searcher's mobile terminal such as a rescue team to a specific victim's mobile terminal is transmitted, and the control signal is received. The victim's mobile terminal sends an emergency signal. The searcher can identify the position of the victim by detecting the intensity of the emergency signal.

JP 2002-314634 A JP 2005-33458 A

  The above methods (1) and (2) and the method disclosed in Patent Document 2 are very effective when a rough place where the disaster victim is present can be specified, but for a wide range of searches. Is not suitable.

On the other hand, in the position detection system disclosed in Patent Document 1, an acoustic signal is generated in the mobile terminal in response to an instruction from the radio exchange station, so that a wide range search is possible. However, when there are a large number of mobile terminals at the search location, the mobile terminals emit search sound signals all at once, which causes the following problems.
(A) It is difficult to count the number of mobile terminals (that is, the number of victims).
(B) Since acoustic signals are generated from various places, it is difficult to specify the position of the victim.
(C) Since an acoustic signal is emitted, it is a hindrance when the disaster victim confirms the surrounding situation, and a hindrance to the conversation between the disaster victim and the searcher.

Therefore, in the position detection system disclosed in Patent Document 1, if the acoustic signal is changed to a signal having a frequency outside the audible band, the above problem (c) can be solved, but the other problems are as follows. It cannot be solved.
Even in the method disclosed in Patent Document 2, when a disaster occurs in a wide range or there are a large number of disaster victims, the emergency signals transmitted from the disaster victim's mobile terminals interfere with each other, thereby As with the problem (b), it may be difficult to specify the position of the victim.

  The present invention has been made to solve the above-described problem, and has an object to avoid interference of search signals transmitted from a plurality of mobile terminals, and to easily count the number of mobile terminals and specify their positions. To do.

The position detection system of the present invention includes search signal setting means for generating search signal setting information for specifying at least one of a transmission frequency and a transmission timing of a search signal for each portable terminal, and the search signal setting information. Is provided in the search signal transmission requesting means for transmitting the search signal to the set mobile terminal and requesting the transmission of the search signal, and the mobile terminal receiving the request transmitted from the search signal transmission requesting means. Search signal transmission means for transmitting a search signal at the transmission frequency and transmission timing specified by the signal setting information is provided.
Further, in one configuration example of the position detection system of the present invention, the search signal setting means further specifies a search signal transmission output value for each portable terminal by the search signal setting information, and the search signal transmission The means transmits the search signal with a transmission output value specified by the search signal setting information.
Further, in one configuration example of the position detection system of the present invention, the search signal setting means uses the intermittent reception timing of the mobile terminal as a reference timing when specifying the transmission timing of the search signal. The search signal transmission means intermittently transmits the search signal using the intermittent reception timing as a reference timing.

Further, one configuration example of the position detection system of the present invention further includes necessity confirmation means for confirming necessity of search for a plurality of portable terminals, and the search signal setting means is requested to search. The search signal setting information is generated for a portable terminal, and the search signal transmission requesting means transmits the generated search signal setting information to a setting destination portable terminal.
Moreover, one configuration example of the position detection system of the present invention is characterized by further comprising list creation means for creating a list of the search signal setting information for each portable terminal.
In addition, one configuration example of the position detection system of the present invention is further provided with a monitor device that receives a search signal transmitted from the portable terminal.

In addition, the present invention is a portable terminal used in a position detection system, and includes a receiving unit that receives a search signal transmission request, and a search signal that specifies at least one of a transmission frequency and a transmission timing of the search signal. Searching signal transmission means for extracting the search information from the transmission request and transmitting a search signal at the transmission frequency and transmission timing specified by the search signal setting information is provided.
Further, in one configuration example of the portable terminal of the present invention, the search signal transmission means outputs the search signal with a specified transmission output value when a transmission output value is specified by the search signal setting information. It is characterized by sending.
Further, in one configuration example of the mobile terminal of the present invention, the search signal transmission means, when the transmission timing is specified by the search signal setting information with the timing of intermittent reception of the mobile terminal as a reference timing, The search signal is intermittently transmitted using the timing of intermittent reception as a reference timing.

  According to the present invention, search signal setting information for specifying at least one of a transmission frequency and a transmission timing of a search signal is generated for each mobile terminal, and the mobile terminal specifies the transmission frequency specified by the search signal setting information. Since the search signal is transmitted at the transmission timing, the interference of the search signals transmitted from a plurality of portable terminals can be reduced. As a result, in the present invention, it is possible to easily count the number of mobile terminals and specify the position. Further, in the present invention, since it is possible to designate the search signal transmission on / off for each mobile terminal, it is possible to stop the search signal transmission depending on the search situation. Furthermore, in the present invention, the transmission frequency and transmission timing of the search signal can be changed according to the search situation.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are diagrams for explaining a position detection system according to a first embodiment of the present invention.
In the present embodiment, the search signal transmitted from the mobile phone terminal of each victim is designated by specifying the transmission frequency, transmission timing, transmission output value, etc. of the search signal transmitted from the mobile phone terminal from the radio base station. It is characterized by avoiding interference.

When a disaster occurs, the necessity confirmation unit (not shown) of the radio base station 2 responds to an instruction from the radio exchange station 1 and the mobile phone terminals 3-1, 3-2, 3 that exist within the area covered by itself. -3, a rescue necessity confirmation request message M-1 is transmitted by a simultaneous notification signal such as CBS (Cell Broadcast Service) (FIG. 1).
When a person who possesses the mobile phone terminals 3-2 and 3-3 is damaged and needs to be rescued, these victims operate the mobile phone terminals 3-2 and 3-3 to request rescue. Thereby, rescue request notification messages M-2-a and M-2-b are transmitted from the mobile phone terminals 3-2 and 3-3 to the radio base station 2, respectively.

Next, the wireless base station 2 that has received the rescue request notification messages M-2-a and M-2-b notifies the wireless switching center 1 of the confirmation result of the necessity of rescue.
The search signal setting unit (not shown) of the wireless switching center 1 that has received the notification from the radio base station 2 specifies a search signal that specifies at least one of the transmission frequency, transmission timing, and transmission output value of the search signal. The setting information is generated for each of the mobile phone terminals 3-2 and 3-3 that have requested rescue. The wireless switching center 1 sends a search signal transmission request including the search signal setting information to the wireless base station 2.

The search signal transmission request unit (not shown) of the radio base station 2 sends a search signal transmission request message M-3-a including search signal setting information to the mobile phone terminals 3-2 and 3-3. Send M-3-b.
The search signal transmitters (not shown) of the mobile phone terminals 3-2 and 3-3 that have received the search signal transmission request messages M-3-a and M-3-b are designated by search signal setting information, respectively. Search signals M-4-a and M-4-b are transmitted with the generated frequency, transmission timing, and transmission output.

  A searcher such as a rescue party obtains information on a search signal transmitted from each mobile phone terminal from an operator who manages the mobile phone terminal public network, for example, and searches for a search signal transmitted from each mobile phone terminal. The location of the victim can be specified by

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The present embodiment more specifically describes the first embodiment. 3 is a block diagram showing the configuration of the radio exchange station 1, FIG. 4 is a block diagram showing the configuration of the radio base station 2, and FIG. 5 is a block diagram showing the configuration of the mobile phone terminal 3 (3-1 to 3-3). It is.

  The wireless switching center 1 includes a rescue necessity confirmation unit 11, a search signal setting unit 12, a rescue list creation unit 13, and a communication unit 14. The rescue necessity confirmation unit 11 confirms whether or not rescue (search) is necessary for the mobile phone terminal 3 via the radio base station 2. The search signal setting unit 12 generates search signal setting information for each mobile phone terminal 3 for which a rescue request has been made. The rescue list creation unit 13 creates a list of search signal setting information for each mobile phone terminal. The communication unit 14 communicates with the radio base station 2.

  The radio base station 2 includes a rescue necessity confirmation unit 21, a search signal transmission request unit 22, a search signal reception unit 23, a radio unit 24, an antenna 25, and a communication unit 26. The rescue necessity confirmation unit 21 confirms whether the rescue is necessary for the mobile phone terminal 3. The search signal transmission request unit 22 requests the mobile phone terminal 3 that has made a rescue request to transmit a search signal. The search signal receiving unit 23 receives a search signal from the mobile phone terminal 3. The wireless unit 24 performs wireless communication with the mobile phone terminal 3 via the antenna 25. The communication unit 26 communicates with the wireless switching center 1.

  The mobile phone terminal 3 includes a storage unit 31, a radio unit 32, an antenna 33, a search signal transmission unit 34, a CPU 35, a timer unit 36, a display unit 37, an operation unit 38, and a CPU bus 39. Have

The cellular phone terminal 3 is configured such that the CPU 35 and each functional unit are connected by a CPU bus 39 and the CPU 35 performs control.
The storage unit 31 stores programs and data when the CPU operates. The storage unit 31 includes intermittent reception timing information 31-1 for specifying the timing for performing intermittent reception, search signal transmission timing information 31-2 for specifying the transmission timing of the search signal, and search for specifying the transmission frequency of the search signal. Signal transmission frequency information 31-3, search signal transmission output value information 31-4 for specifying a transmission output value of a search signal, and the like are held.

  The radio unit 32 performs radio communication with the radio base station 2 via the antenna 33. The search signal transmitter 34 transmits a search signal. The timer unit 36 is used for time measurement of the intermittent reception timing and the search signal transmission timing. The display unit 37 displays information to the user of the mobile phone terminal 3, and the operation unit 38 accepts user key operations.

Hereinafter, the operation of the position detection system of the present embodiment will be described. 6 and 7 are sequence diagrams showing the operation of the position detection system when searching for a victim. Here, a search in a specific area (hereinafter referred to as area A) will be described as an example.
First, when a disaster occurs, the person in charge of the local government requests the operator to send a search signal from the mobile phone terminal 3 existing in the area A for searching for the victim (step S1 in FIG. 6).

In response to a request from the person in charge of the local government, the operator instructs the wireless switching center 1 to transmit a search signal from the mobile phone terminal 3 in the area A (step S2).
Upon receipt of the instruction from the operator, the rescue necessity confirmation unit 11 of the radio exchange station 1 identifies the radio base station 2 corresponding to the area A (step S3), and all mobile phones existing in the area of the radio base station 2 are identified. The radio base station 2 is requested to confirm whether or not the rescue is necessary for the telephone terminal 3 (step S4).

The rescue necessity confirmation unit 21 of the wireless base station 2 that has received a request from the wireless switching center 1 transmits a signal for confirming the necessity of rescue to all mobile phone terminals 3 existing in the area of the local station. Transmission is performed simultaneously via the unit 24 and the antenna 25 (step S5).
The CPU 35 of the mobile phone terminal 3 that has received the rescue necessity confirmation signal from the radio base station 2 causes the display unit 37 to display a message confirming whether or not rescue is necessary. The user of the mobile phone terminal 3 who sees this message performs a predetermined operation on the operation unit 38 if rescue is necessary. Receiving this operation, the CPU 35 transmits a rescue request signal to the radio base station 2 (step S6).

The rescue necessity confirmation unit 21 of the wireless base station 2 that has received the rescue request signal from the mobile phone terminal 3 transmits a rescue result confirmation result signal to the wireless switching center 1 (step S7). The confirmation result signal includes identification information (for example, a telephone number) of the mobile phone terminal 3 that has requested rescue.
The search signal setting unit 12 of the wireless switching center 1 that has received the confirmation result signal from the radio base station 2 requests the search signal setting information that specifies the transmission frequency, transmission timing, and transmission output value of the search signal to be rescued. It is generated for each mobile phone terminal 3 in which there has been (step S8).

Then, the search signal setting unit 12 of the radio exchange station 1 performs a search signal transmission request including the identification information of the mobile phone terminal 3 to which the search signal setting information is allocated in step S8 and the search signal setting information. The data is sent to the radio base station 2 identified in S3 (step S9).
The search signal transmission request unit 22 of the wireless base station 2 that has received the search signal transmission request from the wireless switching center 1 receives the mobile phone terminal 3 (the mobile phone designated by the search signal transmission request) that has been requested to rescue in step S6. The search signal setting information set for the mobile phone terminal 3 is notified to the telephone terminal 3), and the search signal is requested to be transmitted (step S10).

Upon receiving the search signal transmission request, the CPU 3 of the mobile phone terminal 3 transmits the search signal with the frequency, transmission timing, and transmission output specified by the search signal setting information included in the search signal transmission request. The search signal transmitter 34 is instructed (step S11). In accordance with this instruction, the search signal transmission unit 34 starts transmitting a search signal (step S12).
The search signal receiving unit 23 of the radio base station 2 that has received the search signal notifies the radio exchange station 1 that transmission of the search signal has been confirmed (step S13). At this time, the confirmation notification signal transmitted from the radio base station 2 includes the identification information of the mobile phone terminal 3 that has transmitted the search signal.

Upon receipt of the confirmation notification signal from the radio base station 2, the rescue list creation unit 13 of the radio exchange 1 identifies the identification information of the mobile phone terminal 3 that has transmitted the search signal and the search signal setting set for this mobile phone terminal 3. A rescue list in which information is listed is created (step S14), and the rescue list is notified to the operator (step S15). By creating such a list, the victims can be searched based on this list. Examples of the rescue list notification method include printing and display of the rescue list.
The operator notifies the person in charge of the local government of the rescue list received from the wireless switching center 1 (step S16).

  Local officials distribute rescue lists to rescuers and other searchers. The searcher searches for the victim while monitoring the search signal transmitted from each mobile phone terminal 3 (step S17).

  FIG. 8 is a block diagram showing an example of the configuration of the monitor device 4 used by the searcher. The monitor device 4 includes a transmission frequency detection unit 41 that detects the frequency of the search signal, a transmission timing detection unit 42 that detects the transmission timing of the search signal, and a transmission output detection unit that detects the transmission output value of the search signal. 43, a wireless unit 44 that receives the search signal via the antenna 45, a display unit 46 that displays the frequency, transmission timing, transmission output value, etc. of the detected search signal, and a CPU 47 that controls the entire monitor device And have. By using such a monitor device 4, the searcher can recognize the frequency, transmission timing, and transmission output value of the search signal, so that the search signals transmitted from the plurality of mobile phone terminals 3 can be distinguished. can do.

  FIG. 9 is a timing chart showing the search signal transmission operation in this embodiment, and is a diagram for explaining a search signal interference avoidance method. FIG. 9A is a diagram showing the timing of intermittent reception of the mobile phone terminal 3, and FIG. 9B is a search signal of the mobile phone terminal (here, mobile phone terminal 3-A) that has made a rescue request. FIG. 9C is a diagram showing the transmission timing, and FIG. 9C is a diagram showing the transmission timing of a search signal for another mobile phone terminal (here, mobile phone terminal 3-B) that has made a rescue request.

  9A to 9C, t1 is the timing when the mobile phone terminals 3-A and 3-B receive a search signal transmission request from the radio base station 2, and t2, t3 and t4 are intermittent receptions. Timing, ΔT is a period of intermittent reception. Note that intermittent reception means an operation in which reception from the radio base station 2 is performed at regular timing and reception is not performed at other times. The search signal transmission request is also received at the timing of intermittent reception. The intermittent reception timing is specified by the intermittent reception timing information 31-1.

  Here, the search signal setting information notified to the mobile phone terminal 3-A specifies the timing after Δa from the intermittent reception timing as the search signal transmission timing, and specifies a (Hz) as the transmission frequency. It shall be. In response to this search signal setting information, as shown in FIG. 9B, the mobile phone terminal 3-A has a frequency of a (Hz) at timings t5 and t6 after Δa from the intermittent reception timings t2 and t3. Send a search signal.

  Further, the search signal setting information notified to the cellular phone terminal 3-B specifies the timing after Δb from the intermittent reception timing as the transmission timing of the search signal, and specifies b (Hz) as the transmission frequency. It shall be. In response to this search signal setting information, as shown in FIG. 9C, the mobile phone terminal 3-B has a frequency of b (Hz) at timings t7 and t8 after Δb from the intermittent reception timings t2 and t3. Send a search signal.

  In the position detection system disclosed in Patent Document 1, an acoustic signal (DTMF signal) is used as a search signal, and since the acoustic signals transmitted from a plurality of mobile phone terminals interfere with each other, each mobile phone terminal emits. There arises a problem that an acoustic signal cannot be accurately captured. This interference occurs when the acoustic signal is transmitted in the same time zone (hereinafter referred to as cause 1) and the acoustic signal is transmitted in the same frequency band (hereinafter referred to as cause 2).

In the present embodiment, the following solution is used to solve the problem of the position detection system disclosed in Patent Document 1.
First, in order to avoid interference on the time axis, a reference timing is provided for the search signal transmission timing, and the transmission timing is specified for each mobile phone terminal, thereby avoiding search signal interference. This solves the problem caused by cause 1. Specifically, the timing of intermittent reception of the mobile phone terminal is used as the reference timing. In this embodiment, the timing of intermittent reception is used as a reference, the timing delayed by a specified time from the timing of intermittent reception is set as the transmission timing of the search signal, and this transmission timing is transmitted to each mobile phone terminal by the search signal setting information. Notice.

  Next, in order to avoid interference in the same frequency band, the search signal interference frequency is specified for each mobile phone terminal to avoid interference of the search signal. Thereby, the problem resulting from cause 2 is solved. Specifically, a search signal transmission frequency is prepared for each mobile phone terminal. In the present embodiment, the transmission frequency of the search signal is notified to each mobile phone terminal by the search signal setting information, and the search signal is transmitted at the notified transmission frequency.

  As described above, in this embodiment, search signal setting information that specifies at least one of the transmission frequency, transmission timing, and transmission output value of the search signal is generated for each mobile terminal, and the mobile terminal uses the search signal. Since the search signal is transmitted at the transmission frequency and the transmission timing specified by the signal setting information, interference of the search signals transmitted from a plurality of portable terminals can be reduced. As a result, in this embodiment, it is possible to easily count the number of mobile terminals and specify the position, and to search for a victim who has the mobile terminal. Further, in this embodiment, since it is possible to specify the search signal transmission on / off for each mobile terminal, it is possible to stop transmission of the search signal depending on the search situation. Furthermore, in the present embodiment, the transmission frequency, transmission timing, and transmission output value of the search signal can be changed according to the search situation.

  Further, in this embodiment, by intermittently transmitting a search signal, it is possible to save power of the mobile phone terminal, and it is possible to transmit a search signal over a long period of time. In the present embodiment, since the reception of the search signal transmission request and the transmission of the search signal do not affect the incoming / outgoing operation that is the original function of the mobile phone terminal, Functions related to the position detection system of the present embodiment can be made to function in parallel.

[Third Embodiment]
In the first and second embodiments, the position detection system is applied to the area of the public network of the mobile phone terminal. However, the present invention is not limited to this. By using the base station, it becomes possible to search for a victim using the position detection system of the present invention.

  In addition, in the event of excursions such as kindergarten / elementary school, teachers and guardians carry the equipment that can always monitor the search signal transmitted from the mobile phone terminal of each student. It is possible to call attention to the lead person carrying the monitor device when the student is away from the monitor device by a certain distance or more.

In the second embodiment, the intermittent transmission timing of the mobile phone terminal is set as the reference timing of the search signal transmission. However, the timing is not limited to this, and the reference timing is obtained by using a radio clock or the like. It may be.
In addition, the present invention is not limited to use only at the time of intermittent reception of a mobile phone terminal, and the same effect can be obtained even at the time of continuous reception such as during communication with a radio base station. .

  In the first to third embodiments, the wireless switching center 1, the wireless base station 2, the mobile phone terminal 3, and the monitor device 4 are respectively a computer having a CPU, a storage device, a display device, and an interface, and hardware thereof. It can be realized by a program that controls hardware resources. The CPUs of these computers realize the functions described in the first to third embodiments according to programs stored in the storage devices.

  The present invention can be applied to a technique for specifying the position of a mobile terminal that a person has in a disaster or the like.

It is a figure explaining the position detection system which concerns on the 1st Embodiment of this invention. It is a figure explaining the position detection system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless switching center which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the wireless base station which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the mobile telephone terminal which concerns on the 2nd Embodiment of this invention. It is a sequence diagram which shows operation | movement of a position detection system when searching for a disaster victim in the 2nd Embodiment of this invention. It is a sequence diagram which shows operation | movement of a position detection system when searching for a disaster victim in the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the monitor apparatus which a searcher uses in the 2nd Embodiment of this invention. It is a timing chart which shows the transmission operation | movement of the signal for a search in the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wireless switching center, 2 ... Wireless base station, 3-1 to 3-3 ... Cell-phone terminal, 4 ... Monitor apparatus, 11 ... Rescue necessity confirmation part, 12 ... Search signal setting part, 13 ... Rescue list creation , 14 ... Communication unit, 21 ... Rescue necessity confirmation unit, 22 ... Search signal transmission request unit, 23 ... Search signal reception unit, 24 ... Radio unit, 25 ... Antenna, 26 ... Communication unit, 31 ... Storage unit 32 ... Radio unit, 33 ... Antenna, 34 ... Search signal transmission unit, 35 ... CPU, 36 ... Timer unit, 37 ... Display unit, 38 ... Operation unit, 39 ... CPU bus, 31-1 ... Intermittent reception timing information 31-2 ... Search signal transmission timing information, 31-3 ... Search signal transmission frequency information, 31-4 ... Search signal transmission output value information, 41 ... Transmission frequency detector, 42 ... Transmission timing detector, 43 ... outgoing output detection unit, 44 ... radio unit, 45 Antenna, 46 ... display unit, 47 ... CPU.

Claims (9)

Search signal setting means for generating search signal setting information for specifying at least one of the transmission frequency and transmission timing of the search signal for each mobile terminal;
Search signal transmission request means for transmitting the search signal setting information to the mobile terminal of the setting destination and requesting transmission of the search signal;
A search signal transmission means for transmitting a search signal at a transmission frequency and a transmission timing specified in the search signal setting information, provided in a portable terminal that receives the request transmitted from the search signal transmission request means; A position detection system comprising: The position detection system according to claim 1.
The search signal setting means further specifies a transmission output value of the search signal for each portable terminal by the search signal setting information,
The search signal transmitting means transmits the search signal with a transmission output value specified by the search signal setting information. The position detection system according to claim 1 or 2,
When the search signal setting means specifies the transmission timing of the search signal, the transmission timing of the search signal is specified using the intermittent reception timing of the mobile terminal as a reference timing,
The search signal transmitting means intermittently transmits the search signal using the intermittent reception timing as a reference timing. The position detection system according to any one of claims 1 to 3,
Furthermore, it is provided with necessity confirmation means for confirming the necessity of search for a plurality of portable terminals,
The search signal setting means generates the search signal setting information for the mobile terminal requested to search,
The search signal transmission requesting means transmits the generated search signal setting information to a setting destination mobile terminal. The position detection system according to any one of claims 1 to 4,
The position detection system further comprises a list creation means for creating a list of the search signal setting information for each portable terminal. The position detection system according to any one of claims 1 to 5,
The position detection system further comprises a monitor device for receiving a search signal transmitted from the portable terminal. A portable terminal used in a position detection system,
Receiving means for receiving a search signal transmission request;
Search signal setting information for specifying at least one of the transmission frequency and transmission timing of the search signal is extracted from the transmission request, and the search signal is determined by the transmission frequency and transmission timing specified by the search signal setting information. A mobile terminal comprising: a search signal transmitting means for transmitting The mobile terminal according to claim 7, wherein
The search signal transmission means transmits the search signal with a specified transmission output value when a transmission output value is specified by the search signal setting information. The position detection system according to claim 7 or 8,
The search signal transmission means, when the transmission timing is specified by using the search signal setting information with the intermittent reception timing of the mobile terminal as a reference timing, the search signal as the reference timing. A portable terminal characterized by intermittent transmission.

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