JP3770046B2 - Position detection system - Google Patents

Position detection system Download PDF

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Publication number
JP3770046B2
JP3770046B2 JP2000124933A JP2000124933A JP3770046B2 JP 3770046 B2 JP3770046 B2 JP 3770046B2 JP 2000124933 A JP2000124933 A JP 2000124933A JP 2000124933 A JP2000124933 A JP 2000124933A JP 3770046 B2 JP3770046 B2 JP 3770046B2
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Japan
Prior art keywords
base station
terminal
position
cs1
relay device
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JP2000124933A
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JP2001309421A (en
Inventor
一成 前田
晃 大矢
晃一 岡田
克彦 木村
和博 本田
英夫 田中
清隆 竹原
直樹 阿尾
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松下電工株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a position detection system.
[0002]
[Prior art]
In recent years, digital wireless communication systems such as PHS (Personal Handyphone System) are rapidly spreading. FIG. 12 is a schematic configuration diagram of the PHS. This system is configured to connect a plurality of base stations CS1... Connected to the communication line network 1 such as a public telephone line and the base stations CS1. A plurality of terminals PS1 that perform digital communication, base station IDs individually assigned to the respective base stations CS1,..., Position information (for example, latitude and longitude) indicating the installation position, and information such as transmission output are registered. And a location information center 2 that has a location database 3 and estimates the current location of each terminal PS1.
[0003]
The terminal PS1 is set up with a base station (for example, the base station CS1) having the highest radio wave reception level among a plurality of base stations CS1,... Existing in the vicinity, and communicates via the base station CS1. Although connected to the network 1, the terminal PS1 can extract the base station ID assigned to the base station CS1 from the radio wave of the base station CS1. Accordingly, the base station ID of the base station CS1 extracted by the terminal PS1 is transmitted to the location information center 2, and the server 4 of the location information center 2 searches the location database 3 based on the base station ID of the base station CS1, By reading the installation position of the station CS1, it can be estimated that the terminal PS1 exists around the installation position of the base station CS1, so the current position of the terminal PS1 is detected with a detection accuracy of about the installation interval of each base station CS1. Can be detected.
[0004]
In addition, in order to improve the detection accuracy of the terminal PS1, the terminal PS1 receives radio waves from a plurality of base stations CS1 existing in the vicinity, extracts base station IDs of these base stations CS1,. There has also been proposed a position detection system that detects the reception level of radio waves from the stations CS1... And outputs the base station IDs of the base stations CS1. As shown in FIG. 14, the reception level of radio waves is attenuated according to the distance from the base station CS1..., So that the server 4 of the location information center 2 determines that the base station CS1. The approximate distance between the terminals PS1... Can be estimated, and the current position of the terminal PS1 can be estimated from the distances between the plurality of base stations CS1. For example, see JP-A-10-239416.
[0005]
FIG. 13A is a flowchart showing an operation algorithm of the position detection system. A user who owns the terminal PS1 operates the operation button of the terminal PS1 to request the position information center 2 for the position information of the own station. When a local station location information request event occurs (step S31), the terminal PS1 searches for a control channel and acquires control signals from, for example, four base stations CS1 to CS4 existing around the terminal PS1 (step S32). The terminal PS1 extracts the base station IDs of the base stations CS1 to CS4 from the acquired control signal, detects radio wave reception levels L1 to L4 from the base stations CS1 to CS4, and detects the base station ID and radio wave reception levels. After the peripheral base station list including the data of L1 to L4 is created, the peripheral base station list created via the base station having the highest radio wave reception level (for example, base station CS4) is transmitted to the location information center 2 (step S33). At this time, the server 4 of the location information center 2 reads the location information and transmission output of each of the base stations CS1 to CS4 from the location database 3 based on the base station ID of the neighboring base station list transmitted from the terminal PS1, and FIG. The distances X1 to X4 between the terminal PS1 and the base stations CS1 to CS4 are estimated from the radio wave reception levels L1 to L4 of the base stations CS1 to CS4 based on the radio wave attenuation characteristics shown in FIG. And in the server 4, from the estimated value of distance X1-X4 between terminal PS1 and each base station CS1-CS4, and the positional information (longitude, latitude, etc.) of the installation position of each base station CS1-CS4, a figure is shown. 15, the current position of the terminal PS1 is estimated in the manner of three-point surveying (step S34), and the estimated position of the terminal PS1 is transmitted to the terminal PS1 via the communication network 1 and the base station CS4 (step S35). ).
[0006]
As described above, the location information center 2 can detect the current location of the terminal PS1, so not only the location information center 2 notifies the current location to the terminal PS1, but also the nearest station from the current location of the terminal PS1. It is also possible to provide a service for notifying the terminal PS1 side of store information such as restaurants in the vicinity. This position detection system can also be used by a third party who has contracted with a telecommunications carrier to know the current position of a person who has the terminal PS1. For example, the terminal PS1. It can also be used for the purpose of grasping the whereabouts by giving it to the target person or grasping the whereabouts by giving the terminal PS1 to the employee in the factory or business office. The flowchart of FIG. 13B shows an operation algorithm of the position detection system when a third party detects the current position of the person who owns the terminal PS1, and the third party (operator) connects to the communication line network 1. When a terminal location detection request message for requesting to detect the current location of the terminal PS1 is transmitted to the location information center 2 by operating the connected terminal device 5 (step S36), the server 4 of the location information center 2 sends the terminal PS1. A base station list transmission request message for requesting to transmit a neighboring base station list is transmitted (step S37). Upon receiving the base station list transmission request message, terminal PS1 searches the control channel (step S38), extracts the base station ID of each base station CS1... After detecting the reception level of radio waves from and creating a neighboring base station list, the created neighboring base station list is transmitted to the position information center 2 (step S39). At this time, the server 4 of the location information center 2 detects the current location of the terminal PS1 from the information on the neighboring base station list transmitted from the terminal PS1 and the location information of each base station CS1 registered in the location database 3. (Step S40), the detection result is transmitted to the terminal device 5, and the third party is notified of the current position of the terminal PS1 held by the person to be tracked (Step S41).
[0007]
As a position detection system using PHS, a system as shown in FIG. 16 has also been proposed. In this system, each base station CS1 ... communicates with the location information center 2 via the communication network 1 at the time of initial installation, and acquires location information (for example, latitude and longitude) related to the location of the own station. Thus, the information such as the acquired location information and transmission output is intermittently transmitted constantly using the free area of the radio broadcast information message of the control channel. That is, as shown in FIG. 19, the base stations CS1... Transmit control channels at intervals of about 100 msec, and normally transmit idle data when there is no incoming call in the PCH (Batch Call Channel) area. However, instead, information such as the position information of the own station and transmission output is transmitted in the format of the PCH area. And each terminal PS1 ... estimates its own current position based on the position information received from each base station CS1 .... If each base station CS1... Is equipped with a GPS receiver, the position information of the own station can be acquired using the GPS receiver without acquiring the position information from the position information center 2.
[0008]
The flowchart of FIG. 18 shows an operation algorithm when detecting the current position of the terminal PS1..., And the user who owns the terminal PS1 operates the operation button of the terminal PS1 to detect the position information of the own station. When the local station location information request event occurs (step S42), the terminal PS1 searches for a control channel (step S43), and acquires control signals from, for example, four base stations CS1 to CS4 existing around the terminal PS1. Then, information such as position information (longitude and latitude) of each base station CS1 to CS4 and its transmission output is directly acquired from each base station CS1 to CS4 (step S44). In the internal memory of the terminal PS1, the distance attenuation characteristics of radio waves from the base stations CS1 to CS4 are set in advance. In the terminal PS1, the base stations CS1 to CS4 and the base stations CS1 to CS4 are The distance to the terminal PS1 is estimated, and the current position of itself is estimated from the installation position of each base station CS1 to CS4 and the distance to each base station CS1 to CS4 in the manner of three-point surveying (step S45). .
[0009]
In this position detection system, since the terminal PS1 alone can detect its current position without accessing the server 4 of the position information center 2, the processing required for position detection is compared with the position detection system described above. Time can be shortened, the system configuration on the location information center 2 side can be simplified, and communication costs with the location information center 2 can be reduced. Further, in this position detection system, when not providing a service for notifying a third party of the current position of the terminal PS1, the position information center 2 can be eliminated, and the cost of the system can be greatly reduced.
[0010]
[Problems to be solved by the invention]
By the way, when the transmission output of the base station CS1... Is weak like PHS, the radio waves of the base station CS1... Do not reach the terminal PS1. Since wireless communication is not possible, for example, a radio relay device 6 that relays radio signals between the terminals PS1... And the base station CS1... Is installed near the window, and the control channel transmitted from the base station CS1. Is transmitted to the indoor side, thereby enabling wireless communication between the terminals PS1... And the base stations CS1.
[0011]
Here, in the position detection system shown in FIG. 12, when the terminal PS2 is indoors, the terminal PS2 performs radio communication with the base station CS1 via the radio relay apparatus 6, and can only receive radio waves of the radio relay apparatus 6 directly. Therefore, when a base station list request message is input from the position information center 2, the terminal PS2 cannot detect the position information of the base stations CS1... Existing in the vicinity, and is therefore individually assigned to the radio relay apparatus 6. Only the relay device ID transmitted is transmitted. However, since the wireless relay device 6 is portable and the installation location can be easily changed, it is practically impossible to manage the installation location of the wireless relay device 6 in the location information center 2, and the location of the terminal PS2. It could not be detected.
[0012]
Further, even if the terminal PS2 existing indoors can directly receive the radio waves of the base stations CS1... Other than the radio relay device 6, the radio waves from the base stations CS1. If the distance from the reception level to the base station CS1... Is estimated, the estimation result becomes larger than the actual distance, and the position information of the base station existing closest may not be used, and the detection accuracy deteriorates. There was a problem. Such a problem occurs not only when the terminal PS2 is installed indoors, but also when the wireless relay device 6 is installed outdoors in an area where radio waves are difficult to reach, such as a valley of a building. There is a risk of doing.
[0013]
Further, in the position detection system shown in FIG. 17, the wireless relay device 6 is installed, for example, near the window in the position detection system shown in FIG. 16, and wireless communication between the indoor terminal PS2 and the base station CS1 is possible. In the wireless relay device 6, the wireless relay device 6 receives notification information SG1... Such as position information and transmission output transmitted from the base station CS1 closest to the wireless relay device 6 (that is, the radio wave reception level is highest). Then, the received notification information SG1... Is transmitted to the terminal PS2 at a timing different from the transmission timing of the base station CS1 (see FIG. 20). Here, the broadcast information SG1 transmitted from the radio relay device 6 is the same as the broadcast information SG1 transmitted from the base station CS1, and when the base station CS1 transmits its own location information as broadcast information, Since the relay apparatus 6 transmits the position information of the base station CS1 as it is, the terminal PS2 that receives the signal of the radio relay apparatus 6 misrecognizes the position of the radio relay apparatus 6 as the position of the base station CS1, and There was a problem that the current position could not be detected accurately.
[0014]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a position detection system that improves the detection accuracy of the current position of the terminal.
[0015]
[Means for Solving the Problems]
  To achieve the above objective,In the present inventionA location database in which a plurality of base stations connected to a wired communication line network, a plurality of terminals that perform digital communication with the base stations via a wireless line, and the installation positions of the base stations are registered And a center station that detects the current position of the terminal, and one or more radio relay apparatuses that relay radio signals transmitted and received between the base station and the terminal. A first receiving means for receiving a radio signal transmitted from one or a plurality of base stations existing in the periphery of the terminal, and a radio signal for each base station received by the first receiving means for each base station individually A base station ID acquisition means for acquiring the assigned base station ID, and a list of base station IDs acquired by the base station ID acquisition meansCenter stationFirst base station ID transmitting means for transmitting to the center station, and the center station is registered in the location database and a list of base station IDs transmitted from the terminal via the base station and the communication network. In addition, the current position of the terminal is estimated from the installation position of each base station.PlaceIn the position detection system comprising position estimation means, each radio relay apparatus has second receiving means for receiving radio signals transmitted from one or a plurality of base stations existing around the radio relay apparatus. Storage means for storing the base station ID of each base station acquired from the radio signal of each base station received by the second receiving means;When a signal including a base station ID list is received from the terminal, the base station ID stored in the storage unit is added to the received base station ID list and transmitted to the center station.A second base station ID transmission means, and the center stationPlace ofThe position estimation means isWhen receiving a list of base station IDs from the terminal via the wireless relay device, all base station IDs included in the list of base station IDs and the installation positions of the base stations registered in the position database are obtained. Based on the above, the present position of the terminal is estimated.
[0016]
  in this way,In the radio relay apparatus, the base station ID of the base station existing in the vicinity is acquired from the radio signal received by the second receiving means, and stored in the storage means, and with the base station via this radio relay apparatus When a signal including a base station ID list is received from a terminal that performs wireless communication between the terminals, the base station ID stored in the storage unit is added to the received base station ID list, and the second base station ID transmission unit Is transmitted to the center station, it is possible to increase information used when the center station estimates the current position of the terminal, and to improve the accuracy of estimating the position of the terminal.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0020]
  (Basic configuration)
  First, the basic configuration of the position detection system according to the present inventionWill be described with reference to FIGS. Figure 1Basic configuration1 is a schematic configuration diagram of an example in which the position detection system of FIG. 1 is applied to a PHS, and a wireless line is connected between a plurality of base stations CS1... Connected to a communication line network 1 such as a public telephone line and base stations CS1. A plurality of terminals PS1 through which digital communication is performed, a position database 3 in which information such as position information (for example, latitude and longitude) indicating transmission positions of each base station CS1 and transmission output is registered, and a terminal PS1 A position information center (center) comprising a server (first position estimating means) 4 for estimating the current position of the terminal PS1 based on the signal from ... and the installation position of each base station CS1 registered in the position database 3 Station) 2 and a portable radio relay device 6 that is installed, for example, near the window of a building and relays radio signals between terminals PS1... And base stations CS1.
[0021]
FIG. 4 is a block diagram of the terminal PS1, and the terminal PS1 receives a radio signal transmitted from the base station CS1... And the radio relay apparatus 6 existing in the vicinity via the antenna 19 (first receiving means). ) 20, a transmission unit 22 that transmits a radio signal via the antenna 19, a control unit 21 that controls operations of the reception unit 20 and the transmission unit 21, and a memory 23 that stores an operation program and various data. Is done.
[0022]
FIG. 3 is a block diagram of the radio relay apparatus 6. When relaying a signal from the base station CS1... To the terminal PS1..., The signal from the base station CS1. After being converted and demodulated by the modem unit 13a, decoded by the TDMA processing unit 14a, analyzed by the CPU 15, encoded by the TDMA processing unit 14b, modulated by the modem unit 13b, and then modulated by the RF unit 12b The frequency is converted and transmitted to the outside via the antenna 11b. On the other hand, when relaying a signal from the terminal PS1 to the base station CS1, ..., the signal is relayed through a signal path opposite to that described above, and the signal is transmitted to the base station CS1 through the antenna 11a. 2 is a ROM for storing data such as operation programs and parameters, and 17 is a base station of each base station CS1... Obtained by the CPU 15 from data such as operation data and a radio signal from each base station CS1. A RAM 18 serving as a storage means for storing the ID is a power supply unit that is supplied with power from a commercial power supply and generates operating power for the internal circuit. Here, the second receiving means for receiving the radio signal transmitted from the base station CS1... From the RF unit 12a, the MODEM unit 13a, the TDMA processing unit 14a, etc., or the base station ID stored in the RAM is stored in the location information center. The second base station ID transmitting means for transmitting to 2 is configured.
[0023]
For example, the wireless relay device 6 is set up with a base station CS1 closest to the wireless relay device 6 (that is, having the highest radio wave reception level), and the position notification information included in the control channel of the base station CS1. Is always transmitted, and the same information as the received location notification information is intermittently transmitted to the terminal PS2 at a timing different from the transmission timing of the base station CS1. When the terminal PS1 is indoors, the terminal PS1 cannot directly receive radio waves from the base stations CS1... Installed outdoors. However, by installing the wireless relay device 6 at, for example, a window, Wireless communication between the terminal PS1 and the base station CS1.
[0024]
FIG. 2 shows an operation algorithm of the wireless relay device 6 when the power is turned on. When the wireless relay device 6 is turned on (step S1), the wireless relay device 6 searches for a control channel and exists in the vicinity. Control signals from all the base stations CS1... Are acquired (step S2). The CPU 15 of the radio relay device 6 extracts the base station ID from the received control signal, detects the reception level of the received signal, the base station ID of the base stations CS1. A peripheral base station list composed of the above data is created and stored in the RAM 17 (step S3). Then, the CPU 15 uses the RF unit 12a, the MODEM unit 13a, and the TDMA processing unit 14a to store the peripheral base station list stored in the RAM 17 together with the location registration request message via the base station CS1 and the communication line network 1. 2 (step S4).
[0025]
When receiving the location registration request message from the wireless relay device 6, the server 4 in the location information center 2 acquires the base station ID and radio wave reception level data included in the simultaneously received neighboring base station list, and the base station ID Based on the information, the location information of the base stations CS1 to CS4 existing in the vicinity and the information of the transmission output thereof are searched from the location database 3. Further, the server 4 estimates the distances between the base stations CS1 to CS4 and the wireless relay device 6 existing in the vicinity from the reception level of the radio waves and the attenuation characteristics of the radio waves stored in the internal memory. Using the estimation result and the position information of each of the base stations CS1 to CS4, the installation position of the wireless relay device 6 is estimated in the manner of three-point surveying, the relay device ID assigned to the wireless relay device 6 and its position information Is registered in the position database 3 (step S5). If the position information of the wireless relay device 6 is already registered in the position database 3, the server 4 rewrites the position information registered in the position database 3. Thereafter, for example, an operation start signal is transmitted from the location information center 2 to the wireless relay device 6, and the wireless relay device 6 shifts to an operational state (step S6).
[0026]
Here, when the terminal PS1 located indoors detects its current position, even if the terminal PS1 cannot receive radio waves from the outdoor base station CS1... The control unit 21 as a base station ID acquisition unit acquires the relay device ID of the wireless relay device 6 from the received radio wave 20 and stores the acquired relay device ID in the memory 23, and uses this relay device ID as a location request message. At the same time, the signal is transmitted from the transmitting unit 22 as the first base station ID transmitting means to the location information center 2. When the server 4 in the location information center 2 receives the location information request message and the relay device ID transmitted from the radio relay device 6, the installation location of the radio relay device 6 from the location database 3 based on the relay device ID. And the position information of the wireless relay device 6 is transmitted to the terminal PS1, and the terminal PS1 can detect the approximate current position from the installation position of the wireless relay device 6.
[0027]
Even when the installation position of the wireless relay device 6 is changed without permission by the communication carrier or the administrator who manages the location information of the wireless relay device 6, the wireless relay device 6 registers the location in the location information center 2 when the power is turned on. By transmitting the request message, the position information registered in the position database 3 is updated, so that erroneous detection of the current position of the terminal PS1 can be prevented.
[0028]
  (Embodiment)
  Next, embodiments of the present inventionWill be described with reference to FIGS. FIG. 5 is a schematic configuration diagram of an example in which the position detection system of this embodiment is applied to PHS. Other than the operation of the wireless relay device 6Position detection system explained in the basic configurationTherefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. In addition, the configurations of the terminals PS1.Position detection system explained in the basic configurationTherefore, the illustration and description are omitted.
[0029]
FIG. 6A shows an operation algorithm of the wireless relay device 6 when the power is turned on. When the wireless relay device 6 is turned on (step S7), the wireless relay device 6 searches for a control channel and The control signals from all the base stations CS1... Existing in are acquired (step S8). The CPU 15 of the radio relay device 6 extracts the base station ID from the received control signal, detects the reception level of the received signal, the base station ID of the base stations CS1. A peripheral base station list composed of the above data is created, and the peripheral base station list is stored in the RAM 17 as storage means (step S9), and then the operation state is shifted (step S10).
[0030]
FIG. 6B shows an operation algorithm when the indoor terminal PS1 detects the current position of the local station. When a user who owns the terminal PS1 performs an operation of detecting the current position, the terminal PS1 An event requesting the location information of the local station occurs (step S11), and the control unit (base station ID acquisition means) 21 of the terminal PS1 searches the control channel and exists in the vicinity as in the conventional location detection system. After acquiring the base station ID of each base station CS1,..., Detecting the reception level of the radio wave from each base station CS1,... And creating a neighboring base station list (step S12), the created neighboring base station list is positioned. Along with the information request message, the transmission unit 22 transmits the information request message to the wireless relay device 6 (step S13).
[0031]
When the wireless relay device 6 receives the location information request message and the neighboring base station list from the terminal PS1, the wireless relay device 6 stores the received location information request message and the neighboring base station list in the RAM 17 instead of transmitting them directly to the location information center 2 side. After the contents of the neighboring base station list are added to the received neighboring base station list, they are transmitted to the location information center 2 using the RF unit 12a, MODEM unit 13a, and TDMA processing unit 14a (step S14). When the server 4 in the location information center 2 receives the location information request message, the base station ID and radio wave reception level data included in the simultaneously received neighboring base station list are acquired, and the location database is based on the base station ID. 3 is searched for the location information of the base stations CS1 to CS4 existing in the vicinity and the information of the transmission output thereof. Further, the server 4 estimates the distances between the base stations CS1 to CS4 and the wireless relay device 6 existing in the vicinity from the reception level of the radio waves and the attenuation characteristics of the radio waves stored in the internal memory. Using the estimation result and the position information of each of the base stations CS1 to CS4, the position of the terminal PS1 is estimated in the manner of three-point surveying (step S15), and the estimation result is used as the communication network 1, the base station CS1,. It transmits to the terminal PS1 via the device 6 (step S16).
[0032]
Here, the neighboring base station list received by the server 4 of the location information center 2 includes all of the base station information received by the terminal PS1 and the base station information received by the wireless relay device 6. When terminal PS1 is indoors, radio waves from base stations CS1... Are attenuated by the wall of the building, etc., so terminal PS1 can receive radio waves from only a part of base stations CS1. Since the wireless relay device 6 is installed, for example, near a window, it can receive more radio waves from the base station CS1 than the terminal PS1 indoors. Therefore, the current position of the terminal PS1 can be detected with higher accuracy than when the current position of the terminal PS1 is detected only from the information on the base station received by the terminal PS1.
[0033]
  Moreover, in the position detection system of this embodiment, since the configuration of the wireless relay device 6 is only changed in the position detection system of FIG. 12 described above,Described in the basic configurationUnlike the position detection system, it is not necessary to change the server 4 or the database 3 in the position information center 2, and the transition from the conventional position detection system to the position detection system of the present embodiment can be easily performed.
[0034]
  (Reference Example 1)
  The present inventionExample 1 of position detection system related toWill be described with reference to FIGS. Figure 8Reference example 1It is a schematic block diagram of the example which applied this position detection system to PHS. In addition, this systemConfiguration is a basic position detection systemTherefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. In addition, the configurations of the terminals PS1.Position detection system explained in the basic configurationSince it is substantially the same, illustration and description are omitted.
[0035]
Position information indicating the installation positions of the base stations CS1... Is set in advance in the position database 3 of the position information center 2, and the position information acquisition unit 30 of each base station CS1. Then, the server 4 of the position information center 2 is accessed, the position information of the own station written in the position database 3 is acquired, and the acquired position information of the own station is stored in an internal memory (not shown). Then, the broadcast information transmitting unit (first broadcast information transmitting means) 32 of each base station CS1... Uses the acquired position information (that is, the longitude and latitude of the installation position), the transmission output, and other information as radio broadcast information of the control channel. The message is always sent intermittently using the free space of the message. If each base station CS1... Is equipped with a GPS receiver as position information acquisition means, it is possible to use the GPS receiver to acquire the position information indicating the installation position of the own station from the position information center 2. Can be acquired.
[0036]
Here, the outdoor terminal PS2 detects its current position using information such as position information and transmission output transmitted from each base station CS1. That is, the receiving unit 20 of the terminal PS2 searches the control channel and acquires control signals from all the base stations CS1. The control unit 21 serving as the second position information extracting unit extracts the broadcast information such as the position information and transmission output of each base station CS1 from the control signal received by the receiving unit 20, and detects the reception level of the received signal. To do. The memory 23 of the terminal PS2 stores data indicating the relationship between the distance from the base station CS1... And the radio wave reception level, and the control unit 21 serving as the second position estimating means transmits each base station CS1. The distance to each base station CS1... Is estimated from the output and the reception level of the received radio wave, and the current position of each base station CS1... And the distance to each base station CS1. Estimate the position.
[0037]
Further, in the radio relay apparatus 6 that relays radio communication between the base stations CS1 and the terminal PS1 in an area where radio waves from the base stations CS1 are difficult to reach, the installation position of the own station is also the same as described above. Can be estimated. FIG. 8 shows an operation algorithm of the wireless relay device 6. When the wireless relay device 6 is powered on (step S17), the wireless relay device 6 searches for a control channel (step S18), and the periphery of the wireless relay device 6 is displayed. Control signals from all the base stations CS1.
[0038]
In the wireless relay device 6, the CPU 15 as the second position information extracting means extracts information such as position information and transmission output of each base station CS1 from the received control signal, and detects the reception level of the received signal. (Step S19). The RAM 17 of the wireless relay device 6 stores data indicating the relationship between the distance from the base station CS1... And the reception level of radio waves, and the CPU 15 serving as the third position estimating means transmits the transmission output of each base station CS1. Estimates the distance to each base station CS1 from the reception level of the received radio waves, and estimates its current position from the location information of each base station CS1 and the distance to each base station CS1 in the manner of three-point surveying. Then, the estimation result is stored in the RAM 17 (step S20). Here, the wireless relay device 6 is set up with a base station (for example, the base station CS1) closest to the wireless relay device 6 (that is, the reception level of the radio wave is the highest), and wireless communication from the base station CS1 is established. The broadcast information is constantly received, and information having the same content as the information received from the base station CS1 is transmitted at a timing different from the transmission timing of the base station CS1 using the RF unit 12b, the MODEM unit 13b, and the TDMA processing unit 14b. However, if the location information of the base station CS1 is included in the information received from the base station CS1, this location information is replaced with the location information stored in the RAM 17 and transmitted (step S21). The state is shifted (step S22). Here, the RF section 12b, the MODEM section 13b, and the TDMA processing section 14b constitute a second broadcast information transmitting means.
[0039]
Therefore, when the terminal PS1 that performs wireless communication with the base station CS1 via the wireless relay device 6 detects its current position, the terminal PS1 transmits the position information of the wireless relay device 6 transmitted from the wireless relay device 6. Therefore, the current position of the user can be detected with an error of about the transmission range of the wireless relay device 6.
[0040]
  (Reference Example 2)
  The present inventionReference Example 2 for Position Detection SystemWill be described with reference to FIGS. FIG. 9 is a schematic configuration diagram of an example in which the position detection system of this embodiment is applied to PHS. The configuration other than the wireless relay device 6 isReference example 1 mentioned aboveTherefore, the same components are denoted by the same reference numerals, and the description thereof is omitted. In addition, the configurations of the terminals PS1.Position detection system explained in the basic configurationSince it is substantially the same, illustration and description are omitted.
[0041]
FIG. 10 shows an operation algorithm of the wireless relay device 6. When the wireless relay device 6 is powered on (step S23), the wireless relay device 6 searches for a control channel (step S24), and the periphery of the wireless relay device 6 is displayed. Control signals from all the base stations CS1. In the wireless relay device 6, the CPU 15 as the second position information extracting unit extracts broadcast information such as the base station ID, position information, and transmission output of each base station CS 1. Is created and stored in the RAM 17 as storage means (step S25).
[0042]
Here, the wireless relay device 6 is set up with a base station (for example, the base station CS1) closest to the wireless relay device 6 (that is, the reception level of the radio wave is the highest), and wireless communication from the base station CS1 is established. The broadcast information is always received, and the same information as the information received from the base station CS1 is transmitted at a timing different from the transmission timing of the base station CS1, but the information received from the base station CS1 is changed to the base station CS1. Information of the neighboring base station list stored in the RAM 17 (that is, information such as base station IDs of the neighboring base stations CS1 to CS4, position information, etc.) instead of transmitting this information. ) In order from the top of the list using the RF unit 12b, the MODEM unit 13b, and the TDMA processing unit 14b.
[0043]
FIG. 11 shows the relationship between the transmission data of the base station CS1 and the transmission data of the radio relay device 6. The base station CS1 transmits the position information D1 using the free area of the radio broadcast information message of the control channel. Yes. Here, when the radio relay apparatus 6 receives information such as BCCH (broadcast channel), SCCH (channel for dedicated cell), and PCH from the base station CS1, the radio relay apparatus 6 transmits the received information as it is. When receiving, instead of transmitting only the position information D1, the position information D1 to D4 of the neighboring base stations CS1 to CS4 stored in the RAM 17 are transmitted in order from the position information D1, and the transmission to the position information D4 is completed. Then, it returns to the position information D1 again and transmits it repeatedly in order.
[0044]
Therefore, when the terminal PS1 that performs wireless communication with the base station CS1 via the wireless relay device 6 detects its current position, the radio wave that can be actually received by the terminal PS1 is only the radio wave of the wireless relay device 6. However, as described above, since the radio relay device 6 transmits the position information of the plurality of base stations CS1 to CS4 received by the radio relay device 6 to the terminal PS2, the position information of the plurality of base stations CS1 to CS4 is transmitted. It is possible to estimate the current position of itself and to improve the detection accuracy of the current position.
[0045]
【The invention's effect】
  As mentioned above,The present inventionIs a location where a plurality of base stations connected to a wired communication line network, a plurality of terminals performing digital communication with the base station via a wireless line, and a location where each base station is installed are registered A center station that has a database and detects a current position of the terminal, and one or more wireless relay devices that relay radio signals transmitted and received between the base station and the terminal, First receiving means for receiving radio signals transmitted from one or a plurality of base stations existing around the terminal, and each base station individually from the radio signals of each base station received by the first receiving means A base station ID acquisition means for acquiring a base station ID assigned to the base station ID, and a list of base station IDs acquired by the base station ID acquisition meansCenter stationFirst base station ID transmitting means for transmitting to the center station, and the center station is registered in the location database and a list of base station IDs transmitted from the terminal via the base station and the communication network. In addition, the current position of the terminal is estimated from the installation position of each base station.PlaceIn the position detection system comprising position estimation means, each radio relay apparatus has second receiving means for receiving radio signals transmitted from one or a plurality of base stations existing around the radio relay apparatus. Storage means for storing the base station ID of each base station acquired from the radio signal of each base station received by the second receiving means;When a signal including a base station ID list is received from the terminal, the base station ID stored in the storage unit is added to the received base station ID list and transmitted to the center station.A second base station ID transmission means, and the center stationPlace ofThe position estimation means isWhen receiving a list of base station IDs from the terminal via the wireless relay device, all base station IDs included in the list of base station IDs and the installation positions of the base stations registered in the position database are obtained. Based on the above, the present position of the terminal is estimated.
[0046]
  Thus, according to the present invention,In the radio relay apparatus, the base station ID of the base station existing in the vicinity is acquired from the radio signal received by the second receiving means, and stored in the storage means, and with the base station via this radio relay apparatus When a signal including a base station ID list is received from a terminal that performs wireless communication between the terminals, the base station ID stored in the storage unit is added to the received base station ID list, and the second base station ID transmission unit Is transmitted to the center station, the information used when the center station estimates the current position of the terminal can be increased, and the terminal position estimation accuracy is improved.
[Brief description of the drawings]
[Figure 1]The basic composition of the present invention is shown.It is a schematic block diagram.
FIG. 2 is a flowchart showing the operation algorithm of the above.
FIG. 3 is a block diagram of a wireless relay device used in the above.
FIG. 4 is a block diagram of a terminal used in the above.
[Figure 5]Embodiment of this invention is shownIt is a schematic block diagram.
6A and 6B are flowcharts showing the operation algorithm of the above.
[Fig. 7]Reference Example 1 of the present invention is shown.It is a schematic block diagram.
FIG. 8 is a flowchart showing an operation algorithm of the wireless relay device.
FIG. 9Reference Example 2 of the present invention is shown.It is a schematic block diagram.
FIG. 10 is a flowchart showing an operation algorithm of the above wireless relay device.
FIG. 11 is a timing chart showing a relationship between information transmitted from the base station and information transmitted from the radio relay apparatus.
FIG. 12 is a schematic configuration diagram of a conventional position detection system.
FIGS. 13A and 13B are flowcharts showing the operation algorithm of the above.
FIG. 14 is a diagram showing the relationship between the distance between the base station and the terminal and the reception level of radio waves.
FIG. 15 is an explanatory diagram for explaining the position estimation method described above.
FIG. 16 is a schematic configuration diagram of another conventional position detection system.
FIG. 17 is a schematic configuration diagram when a wireless relay device is used in the position detection system of the above.
FIG. 18 is a flowchart showing the operation algorithm of the above.
FIG. 19 is an explanatory diagram of a method for transmitting position notification information by the wireless relay device used in the above embodiment.
FIG. 20 is an explanatory diagram for explaining the timing at which the wireless relay device used for transmitting position notification information is transmitted.
[Explanation of symbols]
  CS1 ... Base station
  PS1 terminal
  2 location information center
  3 Location database
  6 wireless relay device

Claims (1)

  1. A plurality of base stations connected to a wired communication line network; a plurality of terminals that perform digital communication with the base stations via a wireless line; and a location database in which installation positions of the respective base stations are registered. A center station that detects a current position of the terminal, and one or more radio relay apparatuses that relay radio signals transmitted and received between the base station and the terminal, and each of the terminals includes the terminal First receiving means for receiving radio signals transmitted from one or a plurality of base stations existing in the vicinity of the base station, and individually assigning to each base station from the radio signals of each base station received by the first receiving means Base station ID acquisition means for acquiring the received base station ID, and first base station ID transmission means for transmitting a list of base station IDs acquired by the base station ID acquisition means to the center station , the center station From the terminal Comprises a position estimation means you estimate the current position of the terminal the list of the transmitted base station ID via the earth station and the communication network and registered in the location database from the installation position of each base station In the position detection system configured as described above, each of the wireless relay devices has a second receiving means for receiving a wireless signal transmitted from one or a plurality of base stations existing around the wireless relay device; A storage means for storing the base station ID of each base station acquired from the radio signal of each base station received by the receiving means, and a list of base station IDs received when receiving a signal including a list of base station IDs from the terminal a second base station ID transmission unit to be transmitted to the center station by adding the stored base station ID of the storage means provided, position estimation means of said center station, the radio relay device from the terminal When receiving a list of base station IDs via the base station ID, all the base station IDs included in the list of base station IDs and the current position of the terminal based on the installation position of each base station registered in the position database A position detection system characterized by estimating .
JP2000124933A 2000-04-25 2000-04-25 Position detection system Expired - Fee Related JP3770046B2 (en)

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