JPH03239091A - Moving body radio communication equipment - Google Patents

Abstract

PURPOSE:To execute the digital transmission of a radio circuit by measuring a distance between a base station and a moving body, and also, to locate the position of the moving body by providing a common channel receiving means on each base station, and also, connecting a moving body position locating means to an exchange. CONSTITUTION:Common channel receivers 16a-16n provided in base stations 3a-3n receive a position locating signal from a moving machine 5 by a common channel 12 allocated in common to each base station 3a-3n. Also, to an exchange 1 for receiving data in each position locating signal, a position locating and calculating device 2 for inputting this data and locating a position of the moving body 5 is connected. The moving body 5 transmits a position locating signal by the common channel 12 allocated in common to each base station, and a common channel receiver of each base station receives the position locating signal and sends its data to the exchange 1, the exchange 1 sends this data to the position locating and calculating device 2, and the position locating and calculating device 2 locates a position of the moving body 5.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a mobile radio communication device having a switching center and a plurality of base stations, and particularly relates to a mobile radio communication device having a mobile position location function. be.

[Conventional technology]

FIG. 4 shows, for example, BSTJ January 1979.
Voff, 58°Nal, Page 158. Fig, 4
The configuration of the conventional car phone system shown in 1 is shown below.
3a to 3n are switching stations, 3a to 3n are base stations, 4a to 4n are base station antennas, 5 is a mobile device installed in a car, etc., 6 is a mobile device antenna, 1la to 11n are control devices for each base station 3a to 3n, 12a to 12n are control channel transceivers that transmit and receive via control channels exclusively assigned to each base station 3a to 3n; 132 to 13n are locator receivers;
4a to 14n are traffic channel transceivers that transmit and receive data using traffic channels exclusively assigned to each base station 33 to 3n; 15a to 15n are antenna duplexers; 21 is a connection point between the switching center 1 and the public communication network; 22a ~
22n is a communication line connection point between the exchange 1 and base stations 3a to 3n, 23a to 23n are data line connection points, and 25a to 23n are connection points of data lines.
25n is a connection point between the control channel transceivers 12a to 12n and the control devices 118 to lln, and 26a to 26n are locator reception points @ 13a to 13n and the control devices 11a to lln.
Connection points 27a to 27n, 28a to 28n with traffic channel transceivers 14a to 14n and control device 1
Connection points with 1a-lln, 29a-29n.

30a to 30n and 31a to 31n are control channel transceivers 12a to 12n and locator receiver 13, respectively.
a~13n and traffic channel transmission/reception (gll14
This is a connection point between a to 14n and antenna duplexers 15a to 15n.

Next, the operation will be explained. Control channel transmission/reception l of each base station 3a to 3n! 123 to 12n are modulated by a report signal containing an identification signal of each base station 3a to 3n, and constantly transmit carrier waves of different radio frequencies. The mobile device 5 scans all specified control channels, fixes it to the channel with the largest received electric field, and waits. Here, it is assumed that a call is made to a specific mobile device 5 located at the connection point 21 with the public communication network. The switching center 1 issues a command to the base stations 3a to 3n to call the mobile device 5, and in response to this, the control devices 113 to 11n transmit a paging signal to the control channel transceiver 12a to call the mobile device 5.
-12n and antenna duplexers 153 to 15n, the antennas 4a to 4n radiate into space. The mobile device 5 waits for, for example, the base station 3a, which has the strongest electric field, receives a paging signal from the base station 3a, and immediately transmits a response signal. Upon receiving this response signal, the base station 3a allocates an empty traffic channel of the traffic channel transmission/reception@14a and enters a conversation state. The switching center 1 establishes switching connection between the traffic channel specified by the base station 3a and the public communication network. When the communication quality of the current traffic channel deteriorates, the control device 11a
is connected to surrounding base stations, e.g., base stations 3b to 3b, through exchange l.
3e to measure the electric field of the current traffic channel. The electric field is measured by the locator receivers 13b to 13e of each base station 3b to 3e, and if the electric field of the base station 3C is the largest, the switching center 1 transmits the signal to the mobile device 5 through the current traffic channel of the base station 3C. A command is issued to switch to a free traffic channel, and the line of the public telecommunications network is switched to the new traffic channel.

Moreover, when there is a call from the mobile device 5, the operation opposite to the above is performed. When either the public communication network or the mobile device 5 terminates the call, the exchange 1 and the control device 3C perform a termination operation.

[Problem to be solved by the invention]

The conventional car phone system is configured as described above, and is suitable for analog transmission over wireless lines, but when transitioning to digital transmission (TDMA system), the base station 3a
~3n and the mobile device 5 had to be measured, and a device for this purpose was required.

This invention was developed to solve the above-mentioned problems, and is a mobile radio capable of measuring the distance between a base station and a mobile object, as well as locating the position of the mobile object. The purpose is to obtain communication equipment.

[Means to solve the problem]

A mobile radio communication device according to the present invention includes a plurality of base stations having common channel receiving means for receiving position location signals from mobile bodies using a commonly assigned common channel;
The apparatus is provided with an exchange station that receives the data in each position location signal, and a position location means connected to the exchange office that receives the data and locates the position of the moving object.

[For production]

In this invention, a mobile unit transmits a position location signal through a common channel commonly assigned to each base station, and the common channel receiver of each base station receives this position location signal and sends the data to the switching center. , the exchange sends this data to the position locating means, which locates the mobile object.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1st
The figure shows the configuration of a mobile body position locating device according to this embodiment, where 2 is a position locating calculation device, and 16a to 16n are base stations 3a.
A common channel receiver provided within base stations 3a to 3n performs transmission and reception via a common channel 12 commonly assigned to each base station 3a to 3n.

24 is a connection point between the exchange 1 and the position location calculation device 2; 32
a to 32n are connection points between the control devices 11a to lln and the common channel receivers 16a to 16n, and 33a to 33n are the common channel receivers 1116a to 16n and the antenna duplexer 15
This is the connection point with a-15n. The other configurations are the same as in FIG. 4.

Next, the operation will be explained. Control channel transmission/reception 1 of each base station 3a to 3n! &123-12n are each base station 3a-3n
Each carrier wave is modulated with a broadcast signal containing an identification signal and constantly transmits carrier waves of different radio frequencies. Mobile device 5
scans all specified control channels, fixes it to the channel with the largest received electric field, and waits.For example, if the mobile device 5 is located within the zone of the base station 3a, control channel transmission/reception is performed. It is waiting for a signal from aircraft 12a. Here, when a request is made to locate a specific mobile device 5 at the connection point 21 with the public communication network, the switching center 1
commands the base stations 3a to 3n to call and locate the mobile device 5. In response to this, the control device 11a-11
n is a control channel transmitter/receiver 12 for positioning call signals;
It radiates into space from antennas 4a to 4n via a-12n and antenna duplexers 15a to 15n. Mobile II 5 waits on the control channel of the base station 3a that radiated the signal with the strongest electric field among the emitted position location call signals, and upon receiving this position location call signal, it immediately transmits a response signal and switches to the common channel. The position location signal is a burst-like digital signal. The base station 3a that received the response signal
The mobile station 5 reports that it is within its own zone. Further, common channel receivers 168 to 1 of each base station 3a to 3n
When some of the mobile terminals 6n receive a position location signal from the mobile device 5, they measure the absolute time or relative time of arrival of the position location signal by performing correlation detection on the unique word contained therein, and determine the position. Each base station 3 of location signal
The control device 11a sends data such as arrival time differences to a to 3n.
-11n to exchange 1. The exchange 1 transfers these data to the position location calculation device 2 to calculate the position of the movement 15. In this case, common channel receiver 16
If the number of installations of 2 to 16n is large and the density is appropriate, the accuracy of positioning can be made sufficiently high.

Next, assume that a call is made to a specific mobile device 5 through the connection point 21 with the public communication network. in this case,
The exchange 1 instructs the base stations 3a to 3n to call the mobile station 5. In response to this, the control device 118~ll
n is mobile [5's call signal is transmitted and received on the control channel @
12a to 12n and antenna duplexer 15a=15n, the antennas 4a to 4n radiate into space. The mobile device 5 waits on, for example, the control channel of the base station 3a, which emits the signal with the strongest electric field among the paging signals, receives the paging signal from the base station 3a, and immediately transmits a response signal. Base station 3 that received the response signal
a allocates an empty traffic channel of the traffic channel transceiver 14a and enters a talking state. Exchange bureau
performs an exchange connection between the traffic channel specified by the base station 3a and the public communication network. Here, if the communication quality of the current traffic channel deteriorates, the control device 11a connects the mobile device via the currently used traffic channel. 5
to transmit a position location signal using a common channel. Upon receiving this command, the mobile station 5 switches to the common channel, transmits a position location signal, and returns to the current traffic channel.

When the common channel receivers 16a-16n receive this position location signal, they measure the arrival time from the unique word therein and report these data to the switching center 1 via the controllers 11a-11n. The switching center 1 reports these data to the location calculation device 2, and locates the location of the mobile device 5. Based on this positioning result, for example, if the mobile device 5 is within the zone of the base station 3c, the switching center inquires the control device 11C of the base station 3C about an available traffic channel, and also inquires the mobile device I15. A command is given to switch to a free traffic channel of base station 3C,
Switch connecting lines of the public telecommunications network to new traffic channels. Note that the connection points 22a to 22n are for call signals, and the connection points 232 to 23n are for data or control signals.

In the case of a call originating from the mobile device 5, the operation opposite to the above is performed.

When either the public communication network or the mobile device 5 is terminated, the exchange 1 and the control device 11c perform a termination operation.

FIG. 2 shows the configuration of the common channel receivers 16a to 16n, where 41 is a high frequency filter, 42 is a high frequency amplifier, and 43 is a high frequency filter.
is a first mixer, 44 is a synthesizer that generates a first local oscillation frequency, 45 is a first intermediate frequency filter, 46 is a first intermediate frequency amplifier, 47 is a second mixer, and 48 is a generator that generates a second local oscillation frequency. a crystal oscillator; 49 is a second intermediate frequency filter;
50 is a second intermediate frequency amplifier, 51 is a detection/decoder, 52
53 is a unique word detection circuit, 53 is a time measurement circuit, and 54 is a unique word detection circuit.
is a standard clock, and 55 is a control circuit.

In the configuration shown in FIG. 2, when a high frequency signal modulated with a position location signal is input to the connection point 33 with the antenna duplexer 15, it is selected by the high frequency filter 41 and transmitted to the high frequency amplifier 4.
2, mixed with the output of the synthesizer 44 by a first mixer 43, and converted to a first intermediate frequency. after that,
It is selected by the first intermediate frequency filter 45, amplified by the first intermediate frequency amplifier 46, mixed with the output of the second local crystal oscillator 48 by the second mixer 47, and converted to the second intermediate frequency. Furthermore, selected by the second intermediate frequency filter 49,
It is amplified by the second intermediate frequency amplifier 50, and the detection/decoder 51
is decoded into a position location signal. The position location signal includes a unique word of about 14 bits, and the unique word detection circuit 52 detects the correlation with the original unique word, and triggers the time measurement circuit 53 when the correlation reaches a peak. The standard clock 54 is an ultra-high precision clock,
The time measurement circuit 53 measures the absolute time of the trigger and reports it to the exchange 1 from the control circuit 55 via the control device 11. Conversely, the time of the standard clock 54 is corrected by the exchange 1. Since the correlation detection of unique words has an accuracy of about the same level as a dirt bit, if the bit rate of 0 unique words is 50 kbps, then (1 sec ÷ 50 kbps) × s”o #0.4
n, and the location accuracy of the mobile device 5 is about 120 m. When the focus rate is 500 kbps, the location accuracy is improved to about 12 m.

FIG. 3 shows the configuration of a mobile radio communication device according to a second embodiment of the present invention, in which positioning stations 7a to 7, 8a to 8
, the antenna, 17a to 17, the control device, and 18a.
- 18 is also a common channel receiver, 343 to 34 are connection points between the exchange 1 and the control devices 17a to 17, and 35
A-35 are connection points between common channel receivers 188-18 and antennas 8a-8. The other configurations are the same as in FIG. 1.

In the configuration shown in FIG. 3, the positioning stations 7a to 7 are provided to improve accuracy when locating the position of the mobile device 5, and the mobile device 5 transmits a positioning signal through a common channel. When it does, it measures its arrival time and reports the data to exchange l. The switching center 1 is connected to each base station 3a to 3n.
and data from the positioning stations 7a to 7k are transferred to the positioning calculation device 2, and the position of the mobile device 5 is calculated. Other operations are the same as in FIG.

In each of the above embodiments, only the receivers 16a to 16n are provided for the common channel, but the same effect can be obtained even if these are used as transmitters and receivers, and furthermore, message communication with the mobile device 5 is possible. .

(Effects of the Invention) As described above, according to the present invention, in a car telephone system or the like, each base station is provided with a common channel receiving means, and a mobile body position locating means is connected to a switching center. It is possible to measure the distance to a moving object, enable digital transmission of a wireless circuit, and locate the position of the moving object.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 show the constituent countries of the mobile radio communication device according to the first embodiment of the present invention and the constituent countries of its common channel receiver, and FIG. 3 shows the constituent countries of the mobile radio communication device according to the first embodiment of the present invention. The constituent countries of the second embodiment and FIG. 4 show the constituent countries of the conventional device. l... Switching station, 2... Positioning calculation device, 3a-3
n...Base station, 4a to 4n, 6...Antenna, 5.
...Mobile device, lla~lln...Control device, 12a~
12n... Control channel transceiver, 14a to 14n.
...Traffic channel transceiver, 16a-16n.
...Common channel receiver. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A control channel transmitting/receiving means for transmitting and receiving control signals for controlling wireless communication with a mobile body having a transmitting/receiving function using a specially allocated control channel, and a control channel transmitting/receiving means for transmitting and receiving control signals to the mobile body using a specially allocated control channel, and making calls to the mobile body using a exclusively allocated traffic channel. and a plurality of traffic channel transmitting/receiving means for transmitting and receiving signals for control, common channel receiving means for receiving a position location signal from a mobile object through a commonly assigned common channel, and control means for controlling each of the above means. is connected between the base station, the control means of each of the above base stations, and the communication network, and transmits and receives call signals and control signals to and from each of the control means, and receives data in each of the above position location signals. 1. A mobile radio communication device comprising: a switching center; and a position locating means connected to the switching center, inputting each of the above data and locating the position of a mobile object.