JP2004297201A - Mobile phone searching system and searching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile phone searching system whereby possessors having mobile phones can quickly and efficiently search a position of the opposite party even under an environment without a base station, an environment where the base station is not available because of a disaster, an accident and congestion or the like, and even under a state such as a distress where the opposite party lies unconscious and cannot reply. <P>SOLUTION: In the mobile phone searching system using mobile phones each provided with a near distance wireless communication means capable of carrying out direct communication in addition to a communication means via a base station, the near distance wireless communication means of the searching side mobile phone is provided with a means for periodically transmitting a search signal including identification information of the mobile phone of a side to be searched designated by a user as a searching object, and the near distance wireless communication means of the mobile phone at the side to be searched is provided with a means for collating identification information included in the searching signal with the identification information of its own mobile phone, and a means for transmitting a response signal to the searching side mobile phone when the collation result indicates coincidence. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mobile phone incorporating a mobile phone having a two-way communication means by short-range wireless communication, in addition to a communication means of a normal mobile phone via a wireless base station, and incorporating a mobile phone useful for early search of a victim or the like. It relates to a position search system.
INDUSTRIAL APPLICABILITY The present invention is searched in a case of searching for a victim who has been distressed in a mountain, searching for an unknown person who has been buried by collapse of a building, searching for a victim during sightseeing, meeting in a crowd, etc. Provided is a mobile phone built-in search system that is effective in searching for the position of a partner in a short time when the current position of a person on the side is known to some extent.
[0002]
In particular, the present invention makes it possible to quickly find the location of the person to be searched, even if the place where the search is performed is outside the range of the cell of the wireless base station of the mobile phone and outside the normal service area, Also, the present invention provides a mobile phone built-in position search system capable of automatically searching for the position of a partner even if the person to be searched is unconscious due to distress or the like.
[0003]
2. Description of the Related Art Conventionally, a similar position search system using a portable device has been proposed as follows for the purpose of searching for a specific person.
For example, in Japanese Patent Application Laid-Open No. 2002-277539, a "mountain victim search system" uses a small, commercially available radio wave transmitter called a "beacon" for quickly rescuing when involved in an avalanche on a winter mountain. A position search system during a rescue operation is disclosed.
[0004]
The beacon has a function of transmitting a rescue radio wave and a function of receiving the radio wave, and a climber switches on and transmits a radio wave when passing a place where an avalanche is likely to occur. If someone in the climbing group gets caught in an avalanche and is buried in the snow, the remaining members who escaped will switch their beacons to receive radio waves and adjust the directivity of the search antenna and the signal level received from the beacon. As a clue, the location of the victim can be searched.
[0005]
Japanese Patent Application Laid-Open No. 7-38951, entitled "Position detection method for mobile phone" discloses a method for searching for a mobile phone position using the principle of triangulation by a plurality of wireless base stations.
According to the present invention, a position detection inquiry signal is transmitted from a certain radio base station to a mobile phone at predetermined time intervals. The mobile phone that has received the position detection inquiry signal transmits a position detection signal including self-identification information such as a telephone number.
[0006]
The position detection signals are received by at least three wireless base stations near the mobile phone. The reception level of the position detection signal received by each radio base station is detected, and the distance between the mobile phone and each radio base station is calculated based on the reception level. The position of the mobile phone can be specified using the distance calculated by each of the three wireless base stations.
[0007]
[Patent Document 1]
JP-A-2002-277539
[0008]
[Patent Document 2]
JP-A-7-38951
[0009]
[Problems to be solved by the invention]
In the conventional technology, any of "difficulty of carrying the device everyday", "restriction of use time due to power consumption", "error of location search accuracy", "restriction of service area", "restriction of use in case of disaster" etc. We have such a problem.
1) For example, it can be said that an avalanche beacon, which is not a device that is always carried in daily life, has a problem with "everyday portability". This technology is effective in situations where the occurrence of disasters such as avalanches is predicted and used to some extent, but in general, disasters such as earthquakes and fires occur suddenly in everyday life, Often unpredictable. Therefore, it is considered that it is desirable that the technology effective for searching in the event of a disaster be realized with a portable device on a daily basis.
[0010]
2) Further, in the above-described beacon utilization system, since the searched side always transmits a signal, the battery is quickly consumed, and there is a problem of "use time limitation due to power consumption".
3) Also, in general, the person to be searched is in a state of unconsciousness, fainting, etc. in the event of distress, and does not know that he or she is being searched. You may not be able to find someone.
[0011]
4) On the other hand, in the case of the “method of detecting the position of a mobile phone”, the position of the target mobile phone is specified from the distances calculated at the three wireless base stations located far away. Is large, and the accuracy of narrowing down the location of the mobile phone is low.
5) In addition, services using mobile phones are often premised on the use of infrastructure devices such as base stations. Therefore, services do not function when they are "out of service", such as in a mountainous area or inside a building. There is a problem of "restriction of service area".
[0012]
6) Furthermore, base stations near the site in the event of a disaster, for example, have a problem of "use restriction in the event of a disaster" in which there is much processing congestion and it is difficult to use them. A search system that does not require is required.
The present invention has been made in order to solve the above problems, and to provide a mobile phone search system that is useful for a searcher to efficiently detect the position of a searchee in a distress or congestion in a short time. With the goal.
[0013]
[Means for Solving the Problems]
A first invention for solving the above-mentioned problem is a mobile phone search system using a mobile phone having a short-range wireless communication unit with a direct partner in addition to a communication unit with a base station,
Means for periodically transmitting a search signal including identification information of the searched-side mobile phone designated by the user as a search target,
The short-range wireless communication means of the searched mobile phone includes means for comparing the identification information included in the search signal with the identification information of the own mobile phone, and when the matching result matches the search mobile phone, Means for transmitting a response signal.
[0014]
According to the first invention, even in a situation where the searchee cannot respond due to unconsciousness due to a disaster or distress, an environment where a base station does not exist in a mountainous area, or an environment where communication is impossible due to congestion, It is possible to provide a mobile phone search system that is useful for a searcher to easily search for a searcher who carries a search target telephone.
In a second aspect based on the first aspect, the short-distance communication means of the search-side telephone inputs identification information including the telephone number of the searched-side telephone and a terminal serial number as the search signal and transmits the search signal. means,
The short-range communication means of the searched telephone is a search signal for the mobile phone if any one of the identification information included in the search signal is the same as its own identification information held. Search signal matching means for determining that According to the second aspect, even if the searcher cannot confirm the identification information to the searchee due to distress, disaster, or the like, the searcher knows any one of the searched telephones without fail. Then, the searched phone can be searched.
[0015]
In a third aspect based on the first or second aspect, the short-range wireless communication means of the searched mobile phone comprises:
It is characterized in that there are provided means for measuring the reception level of the search signal received by the searched mobile phone, and means for transmitting measurement result data by the measurement means on a response signal.
[0016]
According to the present invention, the short-distance communication means of the search-side mobile phone includes: a search target that the search-side mobile phone has entered a receivable range of a transmission radio wave from the search-side mobile phone; You can know.
In a fourth aspect based on the third aspect, the short-range wireless communication means of the search-side mobile phone uses the reception level information of the search signal and the transmission power of the search signal in the search-side mobile phone included in the reception response signal. , An attenuation rate deriving means for deriving a wireless attenuation rate,
Transmission power control means for automatically controlling the transmission power of the search signal at the time of the next transmission according to a predetermined criterion,
Display control means for displaying the wireless attenuation rate on a display unit of the search-side mobile phone together with a predetermined message at predetermined intervals is provided.
[0017]
According to the present invention, when the searcher narrows down the search range on the searchee side, the searcher can obtain information on how close the searcher telephone is and whether the traveling direction is correct. .
A fifth invention is a mobile phone search method using a mobile phone provided with a short-range wireless communication means for directly communicating with the other party in addition to the communication means for communicating with the base station.
The short-range wireless communication means of the search-side mobile phone periodically transmitting a search signal including the search-side mobile phone identification information for searching for the search-side mobile phone;
A step of comparing the identification information included in the received search signal with the identification information of the searched mobile phone; and, when the identification information matches, a response signal including the reception level of the received search signal. Sending,
A step of transmitting distance information of the receiver to be searched, together with a predetermined message, to a display unit from the reception level of the response signal and the transmission power of the search signal; The method includes a step of controlling and transmitting transmission power of the search signal in accordance with a predetermined rule based on signal reception level information.
[0018]
According to the present invention, it is possible to provide a method for efficiently narrowing down and searching for the position of a searched mobile phone in a short time.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that, for easy understanding throughout the drawings, the same portions are denoted by the same reference numerals. For the sake of simplicity, a mobile phone will be referred to as a mobile phone in a unified name.
[0020]
FIG. 1 is a configuration diagram of a mobile phone search system according to the present invention. 100 denotes a search side mobile phone 1 and 200 denotes a searched side mobile phone 2.
The mobile phone 1 and the mobile phone 2 have a configuration in which signals can be directly exchanged by a built-in short-distance wireless communication unit capable of communicating with a direct communication partner in addition to communication via a base station. I do. This has been made technically possible by the recent realization of one-chip Bluetooth, low power consumption, and one-chip dielectric antennas.
[0021]
In such a configuration, unlike the main communication unit of a current mobile phone via a base station, the Bluetooth unit performs communication using a two-way communication method using the same frequency band and transmits a large amount of information such as image files. It is used to transfer high-speed data with peripheral devices such as personal computers and printers.
In addition, a mobile phone based on PHS or an ad hoc communication system which is currently under study has a communication function not only via a base station but also directly with another mobile phone in a main communication part. Therefore, the present invention is applicable to these mobile phones.
[0022]
In any case, the operation buttons and the display part are shared with the main communication part, and when the search is started according to the present invention, the search function of the sub-menu is selected from the main menu screen or the call code is input. By doing so, the function module unit according to the present invention of the short-range wireless communication means in the search-side mobile phone according to the present invention is activated.
[0023]
In addition, the searched mobile phone receives the search signal including the identification information of the searched mobile phone, thereby similarly activating the functional module unit of the present invention.
The mobile phone 1 and the mobile phone 2 can be both a search side and a searched side, respectively, but here, for convenience of explanation, the mobile phone 1 is a search side and the mobile phone 2 is a search side.
[0024]
FIG. 2 shows a functional configuration diagram of a portion according to the present invention in a mobile phone. Reference numerals 100 and 200 denote a mobile phone, 110, which extracts a functional portion according to the present invention as a functional configuration diagram and displays it inside a block. Reference numeral 210 denotes a display operation unit for performing key input and screen output display, and 130 and 230 transmit a message between the searching mobile phone and the searched mobile phone by a search signal and a response signal using the short-range wireless communication means. A short-range wireless communication control unit that performs communication, 120 and 220 indicate a search signal transmission timer unit that generates a transmission timing of a search signal, and 140 and 240 indicate an identification information holding unit that holds identification information of the mobile phone. ing.
[0025]
In the present invention, since one mobile phone can be the search side or the searched side, the mobile phone 1 and the mobile phone 2 have the same configuration.
The short-range wireless communication means may be a Bluetooth built-in mobile phone, a PHS or an ad hoc communication mobile phone. It is constructed using a ROM for storing a program memory, a RAM for processing work, and a shared bus control mechanism.
[0026]
The functional components according to the present invention are implemented as a program module based on the hardware part of the existing short-range wireless communication means and are incorporated in a mobile phone. The mobile phone is activated by selection and upon detection of a search signal, and upon completion of the search, releases the work area in the RAM. Therefore, it is basically unnecessary to add extra hardware for realizing the present invention.
[0027]
The short-range wireless communication control units 130 and 230 perform message communication of the search signal and the response signal.
FIG. 3 is a diagram illustrating a state in which the searched mobile phone 2 is searched. In FIG. 3, the owner of the mobile phone 1 gradually approaches the location away from the mobile phone 2 to search for the owner of the mobile phone 2, and the short-range wireless communication means between the mobile phone 1 and the mobile phone 2. Shows a state of moving to a position where communication is possible.
[0028]
The mobile phone 2 on the searched side is located at the center C of the transmittable range c of the response signal, and the mobile phone 1 on the search side starts searching from the center A of the reach a of the search signal.
The point A is so far from the point C that the radio wave of the short-range wireless communication means mounted on the mobile phone cannot reach the mobile phone 2, and is gradually approaching the point C where the mobile phone 2 is located.
[0029]
When the mobile phone 1 moves to the point B at the center of the reach range b of the search signal, the radio wave of the short-range wireless communication means can reach the mobile phone 2 and the search target mobile phone transmits the response signal. Since the transmission is within the transmittable range, messages can be exchanged by the search signal and the response signal.
In this state, the technology of the present invention is used.
[0030]
FIG. 4 shows a processing sequence until the mobile phone 2 enters the search range.
The user carrying the mobile phone 1 performs a search start operation at a point A shown in FIG. 3 through the display operation unit 110 provided on the mobile phone 1 in order to search for the owner of the mobile phone 2. In S1, the identification information of the mobile phone 2 to be searched is input.
Upon receiving the identification information of the mobile phone 2 specified by the user's key input, the display operation unit 110 passes a search start request including the identification information to the short-range wireless communication control unit 130. Upon receiving the search start request in step S2, the short-range wireless communication control unit 130 creates a search signal including the identification information of the search target mobile phone 2, and transmits the search signal as a radio wave.
[0031]
At this time, at the same time, a period timer start request is made to the search signal transmission timer unit 120, and accordingly, the search signal transmission timer unit 120 starts a period timer operation at a predetermined period.
The search signal transmission timer unit 120 periodically sends a timer expiration notification to the short-range wireless communication control unit 130 according to the output of the periodic timer. Upon receiving the timer expiration notification, the short-range wireless communication control unit 130 transmits a search signal including the identification information of the mobile phone 2 to the short-range wireless communication path again.
[0032]
Thereafter, this operation is repeated, and the transmission of the search signal including the identification information of the mobile phone 2 to be searched for every predetermined cycle is repeated as step S3.
The user of the mobile phone 1 starts moving from the point A shown in FIG. 3 with the mobile phone 1 to which a search signal is periodically transmitted by a search start operation in order to search for a holder of the mobile phone 2. I do. At this point, the search signal transmitted from the mobile phone 1 does not reach the mobile phone 2 because the mobile phone 2 is out of the radio wave range of the short-range wireless communication unit of the mobile phone 1. This state continues until the user of the mobile phone 1 reaches the point B.
[0033]
When the user of the mobile phone 1 moves to the point B, the mobile phone 1 and the mobile phone 2 enter the radio wave range of the short-range wireless communication means to communicate with each other, and the search transmitted from the mobile phone 1 is performed. The signal can be received by the mobile phone 2.
Within this search range, the search for the searched mobile phone 2 is performed by the mobile phone search system of the present invention.
[0034]
FIG. 5 shows a processing sequence up to the end of the search operation in the search range.
When the short-range wireless communication control unit 230 receives the search signal transmitted from the mobile phone 1 in step S1, the mobile phone 2 extracts the identification information included in the search signal, proceeds to step S2, and proceeds to step S2. The comparison with the self-identification information stored in 240 is performed. If the user has not performed the timer end process, the same process is performed in the subsequently transmitted identification information collating step S3 for the search signal.
[0035]
When the identification information included in the search signal and the self-identification information match, the short-range wireless communication control unit 230 transmits a response signal to the mobile phone 1 on the short-range wireless communication path.
In this comparison, if the identification information does not match, the searched mobile phone 2 does not return a response signal and returns to the standby state. Note that, for simplification of the drawing, the flow of returning to the standby state is omitted.
[0036]
When the mobile phone 1 receives the response signal transmitted from the mobile phone 2 in the short-range wireless communication control unit 130, it determines that the mobile phone 2 to be searched is within the radio wave reach of the short-range wireless communication means. Then, the short-range wireless communication control unit 130 notifies the display operation unit 110 of the search result notification, and the display operation unit 110 notifies the user that the owner of the mobile phone 2 is nearby.
[0037]
The user of the mobile phone 1 continues the search based on the information in the display operation unit 110, and when the user of the mobile phone 2 is actually found, in step S4, an operation for stopping the search processing of the mobile phone 2 is performed. Do.
This operation is performed on the display operation unit 110 of the mobile phone 1, and accordingly, a search stop request is passed from the display operation unit 110 to the short-range wireless communication control unit 130.
[0038]
Upon receiving this request, the short-range wireless communication control unit 130 issues a period timer stop request to the search signal transmission timer unit 120 to stop the periodic transmission of the search signal, and causes the operation of the period timer in the search signal transmission timer unit 120 to stop. Stop.
Thereafter, the timer expiration notification is not passed to the short-range wireless communication control unit 130, and the periodic transmission of the search signal stops. Thus, the search service (operation) ends.
[0039]
Note that, as the identification information of the searched mobile phone that is accepted by the display operation unit 110, information (terminal serial number or the like) that can specify the searched mobile phone can be specified in addition to the telephone number. In this case, a message configuration can be used in which a plurality of types of identification information can be specified at the same time.
Although this identification information can be directly specified by key input, it is also possible for the user to select and specify the content registered in advance on the memory dial.
[0040]
When a plurality of types of identification information are simultaneously specified by the user of the mobile phone 1, the display operation unit 110 issues a search start request including all of the plurality of specified identification information to the short-range wireless communication control unit 130. Pass to In response to this request, the short-range wireless communication control unit 130 creates a search signal including multiple types of identification information at the same time, and periodically transmits the search signal to the mobile phone 2.
[0041]
In addition, the short-range wireless communication control unit 230 of the mobile phone 2 that has received the search signal extracts a plurality of types of identification information included in the search signal and stores the self-identification information stored in the identification information holding unit 240. And if any one of them matches, it is determined that the search signal is for the own mobile phone, and a response signal is returned to the mobile phone 1.
[0042]
Next, a searchable range based on the transmission search signal will be described.
If the transmission power of the search signal is constant, the reach of the radio wave is constant, and the search range is fixed.
In this case, the search is always performed within the search range that secures a certain size, and it can be said that the search probability is high in a situation where the search targets are separated to some extent.
[0043]
However, conversely, when the search target is approaching, a search is performed over a wider range than necessary, which is inefficient in terms of narrowing the search range.
Therefore, a search signal is transmitted at a transmission power that is the maximum search range until the search target is captured, and after the search target is captured, according to the degree of approach, according to a predetermined rule, as described in detail below. It is assumed that the transmission power of the search signal is reduced adaptively.
[0044]
Basically, the position of the mobile phone 2 can be narrowed down by gradually reducing the transmission power. However, if the transmission power is reduced in a large step, or if the mobile phone heads in the wrong search direction, the position of the mobile phone 2 can be reduced. May drop below the receivable level of the mobile phone 2, and in this case, it is necessary to control the transmission power to be increased again by a predetermined step next time.
[0045]
As described above, the non-response state from the searched mobile phone when the mobile phone 2 is out of the reach range is also included such that the search response of the mobile phone 2 is at the limit level that the searched mobile phone can receive within the searchable range. The expression that the transmission power is controlled gradually according to a predetermined rule is gradually reduced while observing information on the previous reception level and the current reception level from the searched mobile phone. .
[0046]
That is, basically, the transmission power is controlled to gradually decrease, but based on the information on the reception level including no response from the mobile phone, while controlling the transmission level by increasing or decreasing by a predetermined step, Approaching the mobile phone.
This is equivalent to gradually narrowing the search range, and an effect that helps a more accurate search activity can be expected. Furthermore, as compared with the case where the transmission power is constant, unnecessary radio wave transmission can be suppressed, so that not only power consumption is suppressed but also interference and interference are prevented.
[0047]
FIG. 6 shows a state when the search range is narrowed. 7 and 8 show search processing sequence diagrams during adaptive control of search signal transmission power.
FIG. 6 shows how the transmission power of the search signal is adaptively changed according to a predetermined rule as the vehicle approaches the search target, thereby narrowing the search range. FIGS. 7 and 8 show the search signal at that time. FIG. 9 is a processing sequence diagram at the time of adaptive control of transmission power.
[0048]
In order to adaptively narrow the search range for the searched mobile phone, the searched mobile phone returns the reception level of the search signal transmitted from the searching mobile phone in the response signal. The search-side mobile phone that has received the response signal can know the reception level of the search signal in the search-side mobile phone. For this reason, the transmission power is adaptively determined so as to be the minimum transmission power required for the search signal to reach the searched mobile phone while approaching the searched mobile phone to narrow the search range. be able to.
[0049]
Since the transmission power of the search signal is known, if the reception level of the search signal in the search target mobile phone, which is the receiving side, can be known, the environmental influence on the propagation of radio waves such as the amount of moisture and dust in the air is obtained. An appropriate transmission power at each time can be determined in consideration of the situation change.
6 and 7, the mobile phone 1 is approaching the point B from the point A while receiving the identification information input in step S1 and continuing the periodic transmission of the search signal. When the mobile phone 1 reaches the point B, the mobile phone 2 to be searched enters a state where it can receive the search signal transmitted from the mobile phone 1.
[0050]
In response to the search start request from the first step S1, the transmission power TP1 is initially set to the maximum in step S2 to transmit the search signal. In step S3, the short-range wireless communication control unit 130 of the mobile phone 1 stores this value and transmits a search signal.
In step S4, when the mobile phone 2 arrives at the point B which is within the reach of the radio wave of the mobile phone 1, and the short-range wireless communication control unit 230 of the mobile phone 2 receives the search signal, the reception is performed in step S5. The reception level RP1 of the search signal radio wave is measured.
[0051]
At the same time, the identification information included in the search signal is extracted and collated with the self-identification information stored in the identification information holding unit 240 in step S6, and when it is determined that the search signal is for the own mobile phone. Then, a response signal including the reception level RP1 measured at the time of receiving the search signal is transmitted on the near-field wireless communication path.
In the mobile phone 1 that has received the response signal, the short-range wireless communication control unit 130 refers to the reception level RP1 of the search signal included in the response signal, and determines the transmission power of the search signal corresponding to the response signal. From step TP1, in step S7, the distance from the mobile phone 2 to the mobile phone 2 and the attenuation factor associated with airborne components
RLoss1 = (TP1-RP1) / TP1── (1) is derived.
[0052]
Further, assuming that the relative distance between the searched mobile phone and the search mobile phone does not rapidly change in a short time in step S8, it can be considered that the change in the attenuation rate is small. Therefore, as the transmission power of the search signal at the next transmission using the attenuation rate calculated above, so as to ensure a sufficient reception intensity RPmin for the search target mobile phone to receive,
TP2 = RPmin / (1-RLoss (1)) ── (2) is determined.
[0053]
As described above, the transmission power TPn of the search signal transmitted at the n-th time is represented by the following equation.
TPn = RPmin / (1-RLos (n-1)) ── (3)
TPn: transmission power of search signal transmitted at n-th time
RPmin: sufficient reception intensity required for receiving the search signal by the searched mobile phone
RLoss (n-1): Attenuation rate when the search target mobile phone receives the search signal from the (n-1) th transmission.
Step S9 and steps S10 to S17 in FIG. 8 show how the arithmetic processing from step S5 to step S8 in FIG. 7 is repeated during the search continuation period.
[0054]
The transmission power of the search signal is determined by the above method, and by repeatedly performing this, while suppressing unnecessary power consumption, the transmission power is reduced in a state where the other party has secured a transmission power necessary and sufficient to receive the search signal. It is possible to narrow the search range by adaptively changing it.
Also, by using the reception level information of the search signal in the searched mobile phone included in the response signal at this time, it is possible to calculate a certain distance to the searched mobile phone. By notifying and displaying the display operation unit, the user of the search-side mobile phone can be informed of the degree of approach to the search target mobile phone.
[0055]
When the short-range wireless communication control unit 130 of the mobile phone 1 receives a response signal including the reception level information of the radio wave when the mobile phone 2 receives the search signal from the mobile phone 1, the short-range wireless communication control unit 130 Then, the reception level information of the search signal included in the response signal is extracted, and the attenuation factor is calculated using this and the transmission power of the search signal corresponding thereto. The calculated attenuation rate is notified to the display operation unit 110, and the display operation unit 110 calculates a relative distance level using the attenuation rate, and performs display according to the calculated relative distance level.
[0056]
At this time, an attenuation rate in an ideal state where the content of air is small is defined in advance, and is set as a relative distance corresponding to the notified attenuation rate.
FIG. 9 shows the degree of approach display on the mobile phone 1 and shows how the display of the degree of approach changes at point A, point B, and point D according to the calculated relative distance.
[0057]
By performing such a display, it is possible to inform the user of the degree of approach to the mobile phone 2.
FIG. 10 is an example of an actual configuration diagram according to the present invention in a mobile phone, and is an explanatory diagram showing in detail an example of the data configuration of the identification information holding unit which is basically the same as FIG. The symbols of the functional blocks are the same as those in FIG.
[0058]
In FIG. 10, in the identification information holding unit 240 of the mobile phone 2 on the searched side, the telephone number “222-2222” and the terminal serial number “ABC123” are stored as the identification information of the mobile phone 2.
The display operation unit 110 of the mobile phone 1 on the search side is provided with a screen for inputting both or one of the telephone number and the serial number at the time of the search start operation so that the user can input the telephone number or the terminal serial number. In advance, it is possible to selectively perform direct input by key operation or input by designation from a memory dial.
[0059]
As described above, assuming that searching for a mobile phone is equivalent to searching for a specific person, the mobile phone to be searched is searched for using the short-range wireless communication means mounted on the mobile phone, and Can also provide information that assists the user in searching by displaying a measure of the distance to the other party. Using this information, the user can find the partner to be searched.
[0060]
【The invention's effect】
As described above, the present invention uses a mobile phone equipped with a short-range wireless communication means directly with the other party in addition to the communication means with the base station, the searching mobile phone and the searched mobile phone, A search for a search target mobile phone is performed by periodically transmitting a search signal and exchanging response signals within the radio wave reach of the short-range wireless communication means. As a result, unlike ordinary mobile phones, the mobile phone can be damaged even outside the cellular base station area, or even in an environment where ordinary mobile phones cannot be used due to congestion due to unexpected disasters or accidents in daily life. A mobile phone search system and a search method capable of searching for a person holding a search-side mobile phone can be provided.
[0061]
Further, based on the transmission power of the search signal and the reception level of the search signal in the searched mobile phone, the transmission power for the next search signal transmission is determined according to a predetermined rule. As a result, in consideration of the distance to the search target and the attenuation factor due to the ratio of the content in the air, the optimum transmission power can be determined in narrowing the search position, and the propagation environment of the radio wave propagation environment can be determined. It is possible to provide a mobile phone search system and a search method that are hardly affected by the change.
[0062]
That is, by adaptively changing the transmission power of the search signal to a level necessary and sufficient for reception on the searched side, it becomes possible to gradually narrow the search range. It is possible to provide a mobile phone search system and a search method that reduce transmission power of a search signal, perform a narrowed search, and continue to provide information that helps a user pinpoint the location of a search target. As a result, it is possible to realize a search for the searched mobile phone earlier.
[0063]
The present invention can be applied not only to a disaster, but also to a search for a caller for a rescue call due to a sudden physical condition abnormality, a search for a meeting partner in crowds, and the like.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a mobile phone search system according to the present invention.
FIG. 2 is a functional configuration diagram of a portion according to the present invention in a mobile phone.
FIG. 3 is a diagram showing a state of searching for a searched mobile phone 2;
FIG. 4 is a processing sequence diagram until the mobile phone 2 enters a search range.
FIG. 5 is a processing sequence diagram up to the end of a search operation within a search range.
FIG. 6 is a diagram showing a state when a search range is narrowed down.
FIG. 7 is a processing sequence diagram during adaptive control of search signal transmission power.
FIG. 8 is a processing sequence diagram (continued) at the time of adaptive control of search signal transmission power.
FIG. 9 is a diagram showing an approach degree display on the mobile phone 1;
FIG. 10 is a configuration diagram of an embodiment according to the present invention in a mobile phone.
[Explanation of symbols]
100 Searching mobile phone
200 Mobile phone to be searched
110, 210 Display operation unit
120, 220 search signal transmission timer unit
130, 230 Short-range wireless communication control unit
140, 240 identification information holding unit

Claims (5)

In a mobile phone search system using a mobile phone having a short-range wireless communication means directly with the other party in addition to the communication means with the base station,
The short-range wireless communication means includes means for periodically transmitting a search signal including identification information of a search target mobile phone designated by the user as a search target,
Means for matching the identification information included in the search signal of the search-side mobile phone with the identification information of the own mobile phone, and means for transmitting a response signal to the search-side mobile phone when the check result matches. Characteristic mobile phone search system. The mobile phone search system according to claim 1,
The short-range communication means, as the search signal, a telephone number of the searched phone, input identification information including a terminal serial number, means for transmitting,
Search signal matching means for judging that the search signal is for the own mobile phone if any one of the identification information included in the search signal of the search side telephone is the same as its own identification information held. And a mobile phone search system. The mobile phone search system according to claim 1 or 2,
The short-range wireless communication unit further includes: a unit for measuring a reception level of the search signal received by the searched mobile phone; and a unit for transmitting measurement result data by the measurement unit on a response signal. Mobile phone search system. The mobile phone search system according to claim 3,
The short-range wireless communication means of the search-side mobile phone, attenuation level derivation means for deriving a wireless attenuation rate from the reception level information of the search signal and the transmission power of the search signal in the search-side mobile phone included in the reception response signal;
Transmission power control means for automatically controlling the transmission power of the search signal at the time of the next transmission according to a predetermined criterion,
A mobile phone search system, further comprising display control means for displaying the wireless attenuation rate on a display unit of the mobile phone together with a predetermined message at predetermined intervals. In a mobile phone search method using a mobile phone having a short-range wireless communication means directly with the other party in addition to the communication means with the base station,
The short-range wireless communication means of the search-side mobile phone periodically transmitting a search signal including the search-side mobile phone identification information for searching for the search-side mobile phone;
A step of comparing the identification information included in the received search signal with the identification information of the searched mobile phone; and, when the identification information matches, a response signal including the reception level of the received search signal. Sending,
A step of calculating distance information of the searched telephone from the reception level of the response signal and the transmission power of the search signal, and transmitting the distance information to a display unit together with a predetermined message; Controlling the transmission power of the search signal in accordance with a predetermined rule based on the reception level information of the response signal and transmitting the search signal.

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