JPH0345030A - Base station equipment, mobile station equipment and mobile communication system using them - Google Patents

Abstract

PURPOSE:To constitute the navigation system without requiring a base station exclusive for the navigation system by providing a means adding its location information to individual information, to a base station equipment capable of sending the individual information in a specific time slot as an incoming control channel. CONSTITUTION:A map information unit 7 connecting to a display device 8 connects to a radio equipment 10, the map information unit 7 reads map information from a storage means such as a CD-ROM and transfers the information to the display device 8. Simultaneously, the position information of an automobile telephone terminal calculated by the radio equipment 10 or a telephone set 3 is transferred to the display device 8. Then a control channel sent from a base station of a mobile communication system is used to detect the position of the mobile station. Thus, the base station for exclusive use of the navigation system is not required to realize the navigation.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a base station device, a mobile station device, and a mobile communication system using the same, and particularly to a base station device and a mobile station that can be used as a navigation system. The present invention relates to devices and mobile communication systems using them.

(Prior art) Mobile communication systems such as car telephone systems are used in automobiles,
As a means of communication for railway vehicles, ships, aircraft, etc.
It is widely used in stores.

By the way, in recent years, in order to identify the location of a moving vehicle, etc., AVM (＾atomatole vehicle
eMonitoring System), G.P.
S (GlobalPositioningSy
Navigation systems such as stem) have been proposed.

In order to realize this navigation system, a base station dedicated to the navigation system or a communication satellite is required.

(Problems to be Solved by the Invention) As mentioned above, in order to configure a navigation system, a base station dedicated to the navigation system is required. , requiring a large amount of manpower and equipment investment.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a base station device and a mobile station device that can configure a navigation system without requiring a base station dedicated to the navigation system. and to provide a mobile communication system using them.

(Means for solving the problem) In the car phone system currently in service, the wireless section between a car phone terminal (i.e., mobile station, hereinafter referred to as MSS) and a wireless base station (hereinafter referred to as MBS) is The MSS is provided with an incoming call control channel (hereinafter referred to as P-ch) that is always received when the MSS is in "standby" mode, and a communication channel (hereinafter referred to as V-ch) used for telephone calls.

These channels include a wireless link for MBS side transmission and MSS side reception (hereinafter referred to as a downlink), and a
There is a wireless line for S-side reception (hereinafter referred to as the 1-line line), and by using this 1-line line, it is possible to make easy-to-use calls similar to a normal telephone.

The present invention provides a mobile phone comprising an inverse base station (base station device) that transmits individual information in each unique time slot within an incoming control channel, and a mobile station (mobile station device) that receives the individual information. The mobile station transmits data such as location information from each base station on the downlink of the control channel, and the mobile station receives the data to determine the current location of the mobile station. It is designed to be detected. Specifically, on the mobile station side, the electric field strength of the data is detected, the distance to the base station is calculated using at least the electric field strength, and the distance between the mobile station and the base station is calculated based on the distance and the position information of the base station. The feature is that it detects the position.

(Function) The location of the mobile station can be detected using the control channel transmitted from the base station of the mobile communication system, and navigation can be performed without the need for a dedicated base station for the navigation system. It can be realized.

(Example) Below, the present invention will be described in detail as applied to a car telephone system.

FIG. 2 is a block diagram showing the configuration of an MSS installed in an automobile in one embodiment of the present invention.

In the figure, a telephone 3 consisting of a handset 31 and a stand 32 is connected to a telephone 1 (line equipment 10).An antenna 1 is also connected to the radio equipment 10.

A map information unit 7 to which a display 8 is connected is connected to the radio 10. This map information unit 7 reads map information from the storage means of the cD-RoMz> and transfers it to the display 8. At the same time, the MSS position information calculated by the radio 10 or the telephone 3 is transferred to the display 8, as will be described later.

Figure 3 (A) shows P-ch transmitted in multi-station simultaneous/sequential system.
It is a figure showing a lower curry data structure.

In the figure, control station information and incoming call information are common information transmitted from each MBS.

Individual information (Bl, B2.B3...) is for each MBSI.
, 2.3, . . . is information sent individually from each MBS in a unique time slot. This individual information is sequentially sent out from a plurality (m) of base stations with control station information at the beginning and incoming call information in between. In the same figure (B), incoming call information is placed before each piece of individual information, but this does not necessarily have to be the case, and incoming calls transmitted within one cycle interposed by control station information F The number of information does not need to be the same as the number of individual information.

In addition, in the car phone system, each MB within the control zone (each zone within Tokyo's 23 wards, Kanagawa, etc.)
The frequency of P-ch transmitted from S is the same within each control zone. Then, the MSS scans the frequencies of P-ah, which are stored in advance, and selects the P-ch that can obtain the maximum received voltage.

Now, the received voltage (field strength) of the selected P-ah at the MSS is shown in FIG.

As is clear from this figure, the simultaneously transmitted control station information and incoming call information each have approximately the same reception voltage, and each individual information has a voltage that corresponds to the distance from the MBS. In this figure, the reception voltage of the individual information MBS3 is higher than that of the individual information MBS2, and the reception voltage of the individual information MBS3 is higher than that of the individual information MBS2.
(reception type) - [ is larger than that of individual information MBS3. Therefore, if the output of each MBS is the same,
Regarding the distance from MSS, MBSI is the closest, followed by MBS3.
, followed by MBS2.

In this embodiment, the individual information transmitted individually from each MBS includes location information (for example, latitude information and longitude information, hereinafter referred to as latitude information) of each MBS, feature information (described later), antenna height information, and effective antenna height information. High frequency output (ERP) information is added.

In this example, the distance from MBS to MSS is calculated using a propagation distance characteristic called the Okumura curve. Information (information indicating whether it is an "urban area, a suburban area," or an "open area") is simply referred to as feature information.

FIG. 4 is a flowchart showing an example of the processing operation of the MSS. This process is carried out by the handset 3 shown in FIG.
1 or the stand 32, or a microcomputer (not shown) disposed within the radio device 10.

First, in step S1, upon reception of P-ch,
Individual information from three or more MBS stations is received, and it is determined whether or not the internal characters have been stored.

This process is performed during one cycle in which common information is sent out.
-ch reception may be performed.

When the individual information from three or more MBS stations is received and stored, in step S2, the individual information of the top three stations with the strongest electric field strength is selected. Note that instead of selecting the individual information of the top three stations with the highest electric field strength in this way, the individual information of the top three stations with the highest ratio of the received electric field strength to the expired high frequency output of each MBS may be selected.

In step S3, feature information is determined based on the individual information of one of the three selected MBSs.

If the feature information is "urban area", in step S4, the corresponding M
Calculate the distance to SS. This distance calculation uses the electric field strength of each individual information, the antenna height information and effective high frequency output information of each MBS added to the individual information, and the reception frequency of the individual information.

Note that the antenna height information of the MSS is required to calculate the distance from the MBS, and this information includes 1 [ml
, 1. 5 [Fixed values such as ml can be used. In addition, when calculating the distance using the Okumura curve, P-ch
Since there is not much influence by the frequency of , a fixed value may be used as the reception frequency of the individual information.

Similarly, when the feature information is "suburban area" or "open area", the distance from the MBS is calculated in step S5 or S6, respectively, using the Okumura curve's suburban area or open area formula.

In step S7, the distance from the MBS is calculated by
It is determined whether three different MBSs were used or not. If the distances have not been calculated for three different MBSs, the process returns to step S3; if the distances have been calculated, the process moves to step S8.

In step S8, MS from three different MBS
Using the distance information to S and the position information (that is, latitude and longitude information) of each MBS, the position information of the MSS is calculated. The principle of calculating position information will be explained with reference to FIG.

FIG. 5 is a schematic diagram showing the positional relationship between three MBSs (MBS1-3) and the MSS.

In Figure 5, if the distances from MBS1-3 to MSS are R1-R3, then arcs are drawn from each MBS with radii R1-R3, and the point where they intersect is MSS.
The position will be . Each MBS! ! ? Since the longitude information is detected from each piece of individual information, the latitude and longitude of the MSS can be calculated from this information.

This MSS longitude calculation can be easily performed by a person skilled in the art, so detailed explanation thereof will be omitted.

Returning to FIG. 4, in step S9, the calculated M
The SS position information is plotted on map information using a CD-ROM or the like. After that, the process returns to step S1.

Note that the process shown in FIG. 4 is performed during P-ch reception, and therefore cannot be performed during a call, that is, during V-ch transmission/reception.

FIG. 1 is a functional block diagram of an embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 2 are used.

The same or equivalent parts are shown.

In FIG. 1, signals output from a plurality of MBSs 1 to 3 are received by a receiving means 2 via an antenna 1.

The telephone device 3A performs telephone calls by transmitting and receiving V-ch.

When the P-ch is received by the receiving means 2, the individual information determining means 4 functions.

The individual information discriminating means 4 is composed of latitude and longitude discriminating means 41, feature discriminating means 42, effective high frequency output discriminating means 43, base station antenna height discriminating means 44, electric field strength detecting means 45, and receiving frequency detecting means 46. There is.

The latitude and longitude determination means 41, the feature determination means 42, the expired high frequency output determination means 43, and the base station antenna height determination means 44
is the longitude information, feature information, effective high frequency output information and base station antenna included in the individual information sent from each MBS.
Determine tena height information.

The electric field strength detection means 45 detects the received electric field strength of each piece of individual information.

The reception frequency detection means 46 detects the P transmitted from each MBS.
-Detect the reception frequency of channel data.

As described above with respect to step S4 in FIG. 4, when using a fixed value such as the average value of the P-ch frequency set in each area as the reception frequency, this reception frequency detection means 46 is unnecessary. .

The distance calculation means 5 selects a distance calculation formula for the Okumura curve from the detected feature information, and uses the calculation formula, detected effective high frequency output information, base station antenna height information, electric field strength, and reception frequency to calculate each distance. Calculate the distance from MBS to MSS. As described above with respect to step S2 in FIG. MS from ゛
Calculate the distance to S.

The self-position calculating means 6 determines the MSS based on the three types of distance information detected by the distance calculating means 5, the latitude and longitude information of the three MBSs detected by the longitude t, and the separate means 41. Calculate the position (latitude and longitude information) of

Map information unit 7 using CD-ROM 73 as a storage medium
is composed of a CD-ROM player 71 and a controller 72.

The CD-ROM player 71 has self-position calculation means 6
Map information including the latitude and longitude information is read from the CD-ROM 73 based on the latitude and longitude information of the MSS detected by. The read map information is output to the display 8 via the controller 72.

Further, the M detected by the self-position calculation means 6
The latitude and longitude information of the SS is also output to the display 8 via the controller 72. That is, display 8
The location of the MSS is plotted on the map shown above. At this time, if the position of the MSS is not on the road, the position is extracted so that the MSS is located on the road closest to the position.

Now, although the present invention has been described as being applied to a car telephone system, it goes without saying that it may be applied to mobile communication systems other than car phone systems.

In addition, in the explanation of step S2 in FIG. 4 above, the selection of base stations from which individual information has been output (selection of three base stations) is performed in order of highest electric field strength, or in order of received electric field strength relative to effective high frequency output. Although the steps are performed in descending order of ratio, the present invention is not particularly limited to this. That is, for example, the three base stations may be selected such that the mobile station is placed in a triangle connecting the three base stations to be selected.

Furthermore, although it has been explained that distances from the three MBSs and their position information are used to calculate the position of the MSS,
For example, by using the distances from two MBSs and their location information, estimate the two possible positions of the MSS, and use this and the location information of the MSS calculated in the previous calculation process. , the positions that the MSS cannot take may be discarded and the position of the MSS may be specified at one location.

Furthermore, in the explanation regarding FIG. 1, it is assumed that the effective high frequency output determining means 43 and the receiving frequency detecting means 46 are provided, but when the expired high frequency output for each base station and the receiving frequency for each area are the same, teeth,
Said means 43 and 46 are unnecessary. Similarly, if the antenna heights of each base station are the same, and if the topography, features, etc. conditions of each base station are the same, the base station antenna height determining means 44 and the feature determining means 42 are also unnecessary. .

In these cases, it goes without saying that it is not necessary to add effective high frequency output information, base station antenna height information, and feature information to the individual information.

Furthermore, in the above explanation, the location information is added to the individual information transmitted from the base station, but for example, on the mobile station side, each base station is associated with the location information of the base station. Alternatively, the location of the base station may be read out after determining the base station that transmitted the individual information from the received individual information.

Further, the self-position calculation/determination of the mobile station may be performed by detecting the phase difference of the modulated signals received from each base station, or by using a method such as Loran's method.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects are achieved.

That is, since the position of a mobile station can be detected using communication data transmitted from a base station of a mobile communication system, navigation can be performed without requiring a base station dedicated to the navigation system.

Therefore, even if a navigation system is to be constructed over a wide area, it does not require much manpower or equipment.

In addition, the mobile communication system can be used for other purposes (i.e., navigation system) when it is not being used for its original purpose, ``standby mode'' (off-talk time in the case of car phone systems). It is possible to improve the usage efficiency of the mobile communication system.

As a result, the added value of the mobile communication system is greatly improved.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram of an embodiment of the present invention. FIG. 2 shows an M mounted on a vehicle in one embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of SS. Figure 3 (A) shows the P-ch transmitted in a multi-station parallel/sequential system.
A diagram showing the bottom data structure, and (B) of the same diagram is a diagram showing a transmission example in each MBS and a reception voltage in the MSS. FIG. 4 is a flowchart showing an example of the processing operation of the MSS. FIG. 5 is a schematic diagram showing the positional relationship between three MBSs and MSS. DESCRIPTION OF SYMBOLS 1... Antenna, 2... Receiving means, 3... Telephone, 3A... Telephone device, 4... Individual information discrimination means, 5
... Distance calculation means, 6. Self-position calculation means, 7.
...Map information unit, 8...Display, 41.
...Latitude and longitude discrimination means, 42... Feature discrimination means, 43.
. . . Effective high frequency output" 11 Other means, 44 . . Base station antenna height determination means, 45 . . Field strength detection means, 4
6... Reception frequency detection means, MBS1-3... Base station

Claims (3)

[Claims] (1) A base station device capable of transmitting individual information in a unique time slot as an incoming call control channel, characterized in that it is equipped with means for adding at least its location information to the individual information. station equipment. (2) A mobile station device that is configured to be movable and receives an incoming control channel output from the base station device according to claim 1, and at least determines location information included in the individual information of the incoming control channel. a position information determination means; a field strength detection means for detecting the electric field strength of the individual information; Distance calculation means for calculating; self-position calculation means for calculating the position of the mobile station device from the distance between the base station device from which the individual information has been sent and the position information of the base station device; and the mobile station device. A mobile station device comprising display means for displaying the location of the mobile station device. (3) multiple base station devices capable of transmitting individual information in unique time slots as incoming control channels;
and a mobile communication system using a mobile station device that is configured to be movable and receives the incoming control channel, wherein each of the base station devices includes means for adding at least its location information to its individual information, The mobile station apparatus includes at least a position information determining means for determining position information included in the individual information, a field strength detecting means for detecting the electric field strength of the individual information, and at least a position information determining means for determining the electric field strength of the individual information. Distance calculation means that calculates the distance between the base station device to which the information was transmitted and the mobile station device concerned, and the distance between the base station device to which the individual information was transmitted and the location information of the base station device. What is claimed is: 1. A mobile communication system comprising: self-location calculating means for calculating the position of a mobile station; and display means for displaying the position of the mobile station.