JPS5819176B2 - Mobile station position determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile station position determination device that determines the number of a mobile station located near a required specific point among mobile stations such as taxis scattered within a certain area. be.

In conventional mobile station position determination devices, multiple receiving stations are distributed in a certain area, and when the mobile station passes near one of these receiving stations, the receiving station receives the radio waves sent from the mobile station. There is a distributed reception method in which the number is sent to the base station.

This system requires wired lines between the plurality of receiving stations and the base station, and has the disadvantage that the number of lines increases as positional accuracy improves.

Another conventional mobile station position determining device is to distribute multiple transmitting stations within a certain area, and when a mobile station passes near one of the transmitting stations, the mobile station receives this point information. There is also a method of transmitting this point information in response to a call from a base station, but in this method, the line frequency between the mobile station and the base station is set separately from the line frequency between the distributed transmitting station and the mobile station. There was a drawback that it had to be.

This invention was made to eliminate these drawbacks, and to put it simply, it activates a specific transmitting station among the distributed transmitting stations with a signal from the base station each time it is necessary, and from this transmitting station. A plurality of mobile stations receiving the radio waves transmit their mobile station numbers to the base station on the same frequency by making arbitrary calls within a set period.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a mobile station position determining device according to the present invention.

In the configuration, 14 is a base station installed at a monitoring station, and 2 is a transmitting station that receives a calling signal A- from base station 1 and transmits a transmission signal B when it determines that this calling signal A is calling its own station. , 3 is a position determination signal A' which is a part of the paging signal A from the base station 1 and the transmission from the transmitting station 2.

The mobile station transmits a response signal C to the base station 1 upon receiving the signal B.

Now, when the number of the mobile station 3, that is, the car number of the taxi 3, is needed at a specific point, the base station 1 selects the transmitting station 2 closest to that specific point (distributed transmitting station 2). A caller to call.

Send number A.

This calling signal A is, for example, a CClR5 as shown in FIG.
The configuration is 1--.

In the configuration shown in FIG. 2, fA and fB are position determining signals, and signal A' in FIG. 1 also corresponds to these signals.

fc. fl) fE indicates station numbers from 000 to 999.

It's the tone.

After receiving the calling signal A, the transmitting station 2 confirms that its own number matches the calling signal A, and then transmits the transmitting signal B.

This transmission signal B has a configuration of CClR5 tones as shown in FIG.

When the mobile station 3 receives the position determination signal A' and the transmission signal B., it transmits a response signal C to the base station 1, and notifies the base station 1 of its own number, that is, the car number of the taxi 3.

FIG. 4 is a block diagram showing one embodiment of the transmitting station 2. As shown in FIG.

In the configuration, 21 is a transceiver that receives a paging signal A from the base station 1 and transmits a transmission signal B to the mobile station 3, and 22 is a 5-ton one of the paging signal A shown in FIG. 2 received by the transceiver 21. a decoder that produces an output when all match the own station number;
Reference numeral 23 denotes a cog which is energized by the output of the decoder 22 and generates a transmission signal B having a five-tone configuration as shown in FIG.

That is, when the base station 1 transmits the paging signal A that calls the transmitting station 2 at a specific point, the transceiver 2 of the transmitting station 2 at the specific point
1 receives the calling signal A and transmits it to the decoder 22.

The decoder 22 produces an output when all five tones of the calling signal A shown in FIG.

When the cog 23 is energized, it transmits a transmission signal B having the configuration shown in FIG. 3 to the mobile station 3 via the transceiver 21.

FIG. 5 is a block diagram showing one embodiment of the mobile station 3.

In the configuration, 31 is a position determination signal A from the base station 1.
' and a transmitter/receiver that receives the transmission signal B from the transmitting station 2 and transmits the response signal C to the base station 1; 32 is a first transmitter/receiver that generates an output when the transmitter/receiver 31 determines that it has received the position determination signal A'; decoder 33, the transmitter/receiver 31 receives the transmitted signal B
a second decoder which produces an output when it determines that it has received a second decoder; 34 is an AND gate that is activated by the outputs of the first and second decoders 32 and 33 and produces an output; 35 is an AND gate that is activated by the output of the AND gate 34; The Korg 36 that generates the response signal C causes the transceiver 31 to stop transmitting when the output of the first decoder 32 is applied, and sets the transceiver 31 to the transmitting state when the output of the AND gate 34 is applied, causing the Korg 35 to transmit the response signal C. It is a transmission control device.

That is, the position determination signal A' from the base station 1 is transmitted to the transmitter/receiver 3.
1 receives and the first decoder 32 receives fA as shown in FIG.
When determining that it is an fB tone, the first decoder 32
produces an output and energizes the transmitter controller 36 to transmit the transmitter/receiver 3.
Stop the transmission function of 1.

Further, when the transmitter/receiver 31 receives the transmission signal B from the transmitting station 2 and the second decoder 33 determines that it is a tone of fA' to fE' shown in FIG. 3, the second decoder 33 produces an output. .

When the first decoder 32 and the second decoder 33 produce an output, the AND gate 34 is energized to produce an output, and de-energizes the transmission control device 36 after a predetermined period of time to restore the transmission function of the transceiver 31. At the same time, the transmitter/receiver 31 transmits a response signal C to the base station 1 by energizing the Korg 35 and setting the Korg 35 .

Next, the operation of the transmission control device 36 will be explained.

The transmission control device 36 transmits a signal at a random time point within a preset period according to the output of the AND gate 34, e.g.
The transmission is activated and the car number is sent out at a random time within 0 seconds.

Considering taxis now, the total number is 1000,
Assuming that 50% of the taxis are empty and there are 100 distributed transmitting stations 2 in the area, the number of taxis per transmitting station 2 will be 5 if they are evenly distributed.

If the regional concentration rate is 5, there will be a maximum of 25 taxis per transmitting station 2.

If the vehicle number transmission time is to (for example, 10 = 0.2 seconds) and the set period is T (for example, T = 5 seconds), base station 1
Then, the number N of mobile stations 3 that can receive the response signal C from the mobile station 3 without colliding with other mobile stations 3 is N=25(1-island)''', so if we include the above value, we get 2 O1224 N=25(1--)>3 (cars) Therefore, the car numbers of 3 out of 25 cars can be determined.

In the case of a taxi, it is not uncommon for a plurality of cars to be required for one request, so if N>3 (cars), the number of cars required for the command is sufficient.

It is obvious that the number of vehicles whose vehicle numbers can be determined increases as the set period is lengthened, and the period may be set appropriately depending on the request frequency, the number of mobile stations 3, etc.

Furthermore, whether to use a tone signal or a digital signal for transmitting the vehicle number may be determined based on the relationship with the vehicle number transmission period.

Note that the state in which the mobile station 3 is prohibited from transmitting by the tone from the base station 1 is canceled when the above-mentioned vehicle number transmission period has elapsed when the next signal from the transmitting station 2 cannot be received.

Furthermore, it is clear that the same effect can be obtained even if the transmission signals from the base station 1 and the transmitting station 2 are digitally transmitted.

According to the embodiment described above, transmission and reception are performed in sequence from base station 1 → transmitting station 2 → mobile station 3 → base station, so that the transmission signal B from transmitting station 2 to mobile station 3 and the mobile station 3
Even if the frequency of the response signal C sent from the base station to the base station 1 is made to match the frequency of the paging signal A transmitted from the base station, interference will not occur.

Therefore, the number of line frequencies can be reduced to one.

The device of the mobile station 3 according to the present invention is characterized by being extremely simple;
It is also possible to increase the reliability of the information by modulating the radio waves with a unique signal, and the mobile station 3 distinguishes and memorizes this, and applies a normal fractional transmission method in which it is transmitted along with the vehicle number.

As described above, according to the present invention, signal transmission and reception is performed sequentially between the base station, the transmitting station, and the mobile station, so there is no interference even if the frequencies of the lines used are the same. .

Further, since the mobile station's transmission is limited to only stations in a specific area called by the base station, interference is further prevented.

Therefore, the device can be made simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of a mobile station position determining device according to the present invention. FIG. 2 is a configuration diagram showing an example of the configuration of a paging signal from a base station. FIG. 3 is a configuration diagram showing an example of the configuration of a transmission signal from a transmitting station. FIG. 4 is a block diagram showing one embodiment of the transmitting station. FIG. 5 is a block diagram showing one embodiment of a mobile station. Note that corresponding parts in the figure are given corresponding symbols. In the figure, 1 is a base station, 2 is a transmitting station, 3 is a mobile station, 2
1 is a transceiver, 22 is a decoder, 23 is a Korg, 31 is a transceiver, 32 is a first decoder, 33 is a second decoder, 34 is an AND gate, 35 is a Korg, and 36 is a transmission control device.

Claims (1)

[Claims] 1. A base station that transmits a paging signal according to a target called party, a group of transmitting stations that transmit a predetermined transmission signal when called by the paging signal from the base station, and A mobile station position determination device comprising a mobile station group that transmits a predetermined response signal to the base station in response to reception of the transmission signal. 2. The mobile station position determination device according to claim 1, wherein the paging signal is composed of a position determination signal and a number display signal. 3. Each of the transmitting station groups includes: a transceiver that receives the paging signal and transmits the transmission signal; a decoder that produces an output when the transceiver confirms that the paging signal received by the transceiver is its own number; 3. The mobile station position determination device according to claim 1, further comprising: a cog which is energized by the output of a decoder and causes the predetermined transmission signal to be transmitted from the transceiver to the mobile station group. 4. The mobile station position determination device according to claim 3, wherein the transceiver is enabled to transmit based on the output of the decoder. 5. Each of the mobile station groups includes: a transceiver that receives the paging signal and the transmission signal and transmits the response signal; a first decoder that produces an output when the transceiver receives the paging signal; a second decoder that produces an output when a transceiver receives the transmitted signal; and a cog energized by the outputs of the first and second decoders to transmit a predetermined response signal from the transceiver. A mobile station position determination device according to any one of claims 1 to 4. 6. The transceiver of the mobile station group stops the transmission function by the output of the first decoder, and stops the transmitting function of the first decoder. Second
6. The mobile station position determination device according to claim 5, further comprising a transmission control device for restoring the transmission function by the output of the decoder. 7. The mobile station according to claim 6, wherein the transmission control device is configured to restore the transmission function after a predetermined time has elapsed after both outputs of the first and second decoders are applied. Position determination device.