JPH07170548A - Mobile communication system - Google Patents

Abstract

PURPOSE:To obtain a mobile communication system comprising a base station and plural mobile stations whose power consumption is reduced and whose circuit configuration is made small in scale and available of two-way data communication. CONSTITUTION:When a mobile station 1 detects the present station code, the station 1 sends the present station code to a base station 2 through the use of a very weak radio wave. The base station 2 scans a scanning antenna 2a to catch the very weak radio wave from the mobile station 1 by changing the directivity of the antenna and to detect the mobile station code included in the received signal. Thus, the base station 1 informs it to a requesting party 3 that the calling of the mobile station 1 is ensured. That is, the contact that the mobile station 1 surely receives a call from the base station 2 is surely sent from the mobile station 1 to the base station 2 through the very weak radio wave.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system composed of a base station and a plurality of mobile stations, and more particularly to a mobile communication system composed of a pager capable of bidirectional data communication.

Generally, in a selective call radio system called a paging system, one base station covers a wide range of zones, and a selective call service is provided to, for example, more than 30,000 mobile stations (pagers) on one radio frequency. be able to. That is, the base station transmits a selection signal (ID code) and further a message in accordance with a call request telephone from a general subscriber, while the pager detects its own ID code in the received signal, A lamp or a buzzer notifies that the call is being made, and further, a message following the ID code is displayed by a built-in liquid crystal display device or the like.

[0003]

2. Description of the Related Art In such a paging system, when the pager is located in a place where radio waves do not reach (for example, subways, tunnels, areas outside the service range, etc.) or when the pager power is turned off (for example, In the case of meetings, concerts, etc.), the pager cannot call the pager. However, the base station cannot know that the pager is in the uncallable state as described above. This is due to the one-way communication from the base station to the pager.

Therefore, pagers capable of bidirectional data communication have been developed. With this, when a call is made from the base station to the pager, the ID code of the own station is transmitted from the pager to the base station,
I am able to contact you that I have received the call.

[0005]

However, the conventional pager capable of two-way data communication requires a considerable amount of power to transmit the ID code to the base station, and therefore the circuit configuration of the transmitter is also required. It has to be a large one. This is contrary to the conditions originally required for pagers, such as long-term use of batteries and good portability in terms of shape and weight, and there has been a demand for solving these problems.

The present invention has been made in view of the above circumstances, and enables a mobile station including a mobile station that enables bidirectional data communication, reduces power consumption, and reduces the circuit configuration. An object is to provide a body communication system.

[0007]

In order to achieve the above-mentioned object, the present invention is provided in a mobile station 1 as shown in FIG. 1 and detects the transmission of its own code from a base station 2. The station code detection means 1a and the mobile station 1, and when the own station code detection means 1a detects the transmission of the own station code from the base station 2, transmits the own station code to the base station 2 Means 1b and a scanning antenna 2 provided in the base station 2 and having a directivity and capable of scanning the direction of the directivity.
and a mobile station code detecting means 2b which is provided in the base station 2 and detects a mobile station code included in a received signal received by the scanning antenna 2a. To be done.

This mobile communication system is provided in the base station 2, and the call is sure to the client 3 who requests the mobile station corresponding to the mobile station code detected by the mobile station code detecting means 2b. It further has an informing means 2c for informing that it has been performed.

The mobile communication system further includes an omnidirectional antenna 2d provided in the base station 2, which has no directivity and transmits a transmission signal including a mobile station code in all directions.

The mobile communication system further comprises code transmitting means 2e which is provided in the base station 2 and receives a call request from a predetermined mobile station and transmits the code of the predetermined mobile station from the omnidirectional antenna 2d. .

The mobile communication system is provided in the base station 2, and when the mobile station code detecting means 2b detects the mobile station code, the mobile station code and the answerback signal detected by the mobile station code detecting means 2b are sent. Answerback means 2f for transmitting from omnidirectional antenna 2d and mobile station 1
And a repeat execution means 1c which is provided in the mobile station 1 and causes the own station code transmission means 1b to repeatedly execute the transmission of the own station code to the base station 2. Answer back receiving means 1d for receiving the mobile station code and answer back signal for
And the answerback receiving means 1d provided in the mobile station 1.
When it receives a mobile station code and an answerback signal for its own station, the operation of the repetitive execution means 1c is stopped and the base station 2 of the own station code by the own station code transmission means 1b.
And a stop means 1e for stopping the transmission to the.

The mobile station 1 may be not only a pager but also a general mobile communication device capable of two-way wireless communication.

[0013]

In the above structure, first, the code transmitting means 2e of the base station 2 receives a request from the client 3 to call a predetermined mobile station, and the code of the predetermined mobile station is transmitted from the omnidirectional antenna 2d. .

The local code detecting means 1a of the mobile station 1 receives the signal transmitted from the omnidirectional antenna 2d, and determines whether or not the local code is included therein. As a result, when the own station code is detected, the own station code transmitting means 1b
However, the own station code of the mobile station 1 is transmitted to the base station 2
Send to. This transmission is repeatedly executed by the repeat execution means 1c.

In the base station 2, the scanning antenna 2a is scanned to change the direction of directivity to capture a weak radio wave from the mobile station 1, and the mobile station code detecting means 2b causes the scanning antenna 2 to operate.
The mobile station code included in the received signal received in a is detected. When the mobile station code detecting means 2b detects the mobile station code, the notifying means 2c certainly calls the requester 3 for the mobile station corresponding to the mobile station code detected by the mobile station code detecting means 2b. Notify that Further, the answerback means 2f transmits the mobile station code detected by the mobile station code detection means 2b and the answerback signal from the omnidirectional antenna 2d.

On the other hand, the answerback receiving means 1d of the mobile station 1 receives the mobile station code and answerback signal for itself from the answerback means 2f of the base station 2. By receiving this, the stopping means 1e stops the operation of the repeat executing means 1c and stops the transmission of the own station code to the base station 2 by the own station code transmitting means 1b.

In this way, the notification that the mobile station 1 has surely received the call from the base station 2 is reliably transmitted from the mobile station 1 to the base station 2 by a weak radio wave. By using the scanning antenna 2a, the mobile station 1 to the base station 2
The mobile station 1 consumes less power, and the circuit configuration of the transmission circuit of the mobile station 1 for transmitting the weak radio wave may be small. Become.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mobile communication system of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of the base station of the first embodiment.

First, an ID code signal and a message signal are input from a call requester to a base station via a station line. The ID code signal is a signal of a code individually assigned to each pager in order to identify the pager, and the message signal is a numerical or character signal that the client has requested to display on the liquid crystal display device of the pager. Is. These are combined in the signal processing unit 11, and a unique word (UW) signal indicating the burst position reference is added to them. Then, these are FSK-modulated by the modulator 12, and the modulated carrier is amplified by the RF amplifier 13 and output from the omnidirectional antenna 14. This omnidirectional antenna 14
Is an antenna with a nearly uniform directivity to the service zone. The service zone is not necessarily 360 degrees around the omnidirectional antenna 14.

Furthermore, the base station comprises a scanning antenna 15. The scanning antenna 15 is a phase array antenna having sharp directivity and capable of scanning the direction of the directivity by electronic scanning. The scanning antenna 15 may be an antenna that can be scanned by mechanical scanning.

FIG. 4 is a block diagram showing the phase array antenna of this embodiment. That is, the phase array antenna includes a plurality of unit antennas 15d to 15f, which are dipoles and are arranged in a predetermined space,
A plurality of phase shifters 15d to 15f respectively connected to the unit antennas 15a to 15c and a plurality of phase shifters 15d.
Beam direction controller 15g connected to 15f to 15f, and distributor / combiner 15 connected to a plurality of phase shifters 15d to 15f.
and h. The beam direction control unit 15g individually controls each of the phase shifters 15d to 15f. As a result, the directivity generated by the entire unit antennas 15a to 15c becomes sharp, and the direction of the directivity can be temporally changed for scanning.

Returning to FIG. 2, a modulated carrier wave, which will be described later, received from the scanning antenna 15 is amplified by the RF amplifying section 16,
The conversion unit 17 converts the signal into an IF signal, and the demodulation unit 18 performs FSK.
Demodulated. The demodulated signal includes the ID code signal and the message signal sent from the pager. This ID code signal is detected by the ID code detecting section 19, and the message signal is detected by the message detecting section 20. In the subsequent signal processing unit 21, the requester who has requested the pager corresponding to the detected ID code signal is notified via the line that the call has been made, and the detected message is requested. Communicate to others. Further, the signal processing unit 21 adds an answer-back signal to the detected ID code signal and sends it to the signal processing unit 11. The answerback signal is a signal that informs the pager that the base station has confirmed the reception confirmation signal sent from the pager. The ID code signal and the answerback signal are transmitted to the signal processing unit 11, the modulation unit 12, the RF
It is output from the omnidirectional antenna 14 via the amplifier 13.

FIG. 3 is a block diagram of the pager of the first embodiment. First, the antenna 22 is an antenna for both transmission and reception, and the RF switching unit 23 switches between transmission and reception. RF
The switching unit 23 is always located on the receiving side unless a transmission switching signal described later is input. The received RF modulated carrier signal is converted into an IF signal by the converter 24, and FSK demodulated by the demodulator 25. The demodulated signal includes the ID code signal and the message signal or the answerback signal sent from the base station. The ID code detection unit 26 detects the ID code signal from the demodulated signal and determines whether the pager corresponding to this ID code signal is the own station. If it is not its own station, it is left alone, and if it is its own station, a demodulation signal is sent to the message detection unit 27. The message detection unit 27 detects the message signal or answer-back signal added to the ID code signal, and when the message signal is detected, sends it to the display unit 28. The display unit 28 displays the message in characters on the liquid crystal display device and sounds the buzzer to notify the pager holder of the incoming call. On the other hand, when the answer back signal is detected, the message detection unit 27 outputs the answer back signal to the signal processing unit 3.
Send to 2.

The signal processing unit 32 includes a message detection unit 2
7, the ID code generation unit 29, the confirmation input unit 30, and the message input unit 31 are connected. The ID code generation unit 29 is a unit that generates a pager's own ID code signal, and the confirmation input unit 30 is an input device that manually inputs a confirmation signal when the pager holder confirms the incoming call. The message input unit 31 is an input device for inputting a message to be sent to the call requester when the pager holder confirms the incoming call. In the signal processing unit 32, when the confirmation signal is input from the confirmation input unit 30, the local ID from the ID code generating unit 29 is input.
A message from the message input unit 31 is added to the code signal, and a unique word is further added to the modulator 33.
Output to. Then, this output is repeatedly executed. Further, when the signal processing unit 32 receives the answerback signal from the message detection unit 27, the signal processing unit 32 stops the repeated execution of this output. The signal processing unit 32 outputs the transmission switching signal to the RF switching unit 23 when outputting the output signal to the modulation unit 33.

The modulator 33 FSK-modulates the signal sent from the signal processor 32 and sends it to the RF switch 23. At this time, the RF switching unit 23 sends the transmission switching signal to the signal processing unit 3.
Since it is transmitted from 2, the RF transmitted from the modulator 33
The modulated wave is output from the antenna 22.

The operation of the base station and pager configured as above will be described with reference to FIG. FIG. 5 is a timing chart of signals of each unit of the base station and the pager.

First, in the signal processing section 11 of FIG.
A signal for calling the pager of D code ID1 and transmitting message M1, a signal for calling the pager of ID code ID2 and transmitting message M2 ... A signal for calling the pager of ID code IDn and transmitting message Mn [FIG. 5 (A)]
Is created. These signals are transmitted from the omnidirectional antenna 14 to the antenna of each pager as a burst signal [FIG. 5 (B)]. This transmission output is equivalent to the transmission output of the conventional base station.

The pager antenna 22 of FIG. 3 receives the burst signal and outputs it to the RF switching section 23 and the conversion section 2.
4, sent to the ID code detection unit 26 via the demodulation unit 25.
Here, it is assumed that the pager in FIG. 3 has an ID code of ID1. Then, the ID code detection unit 26 causes the own station code ID
1 [FIG. 5 (C)], and the message detection unit 27 detects the message M1 [FIG. 5 (D)].

The holder of the pager looks at the message displayed on the display unit 28 and then inputs the message M2 (FIG. 5 (E)) directed to the call requester to the message input unit 31 and confirms it. Confirmation signal from the input unit 30 [Fig.
(F)] is input. Upon receiving the confirmation signal, the signal processing unit 3
Reference numeral 2 denotes a reception confirmation signal [FIG. 5 (G)] including a local code ID1, a message M2 and the like, a modulator 33, and an RF switch 23.
It is transmitted from the antenna 22 via the. This transmission output is relatively weak. Further, the output of the reception confirmation signal from the signal processing unit 32 to the modulation unit 33 is repeatedly executed.

The scanning antenna 15 of the base station shown in FIG. 2 is scan-controlled in the direction of its directivity so that the direction of its directivity faces all service zones. So wherever the pager is in the service zone,
The scanning antenna 15 has a chance to receive the radio wave transmitted from the pager once in one scanning cycle. Moreover, since the scanning antenna 15 has a sharp directivity, it is possible to receive even a weak radio wave transmitted from the pager. Even if the reception confirmation signal is not received within one scanning cycle, the transmission of the reception confirmation signal is repeatedly executed, so that the scanning antenna 15 can always receive the reception confirmation signal.

The received signal received by the scanning antenna 15 from the pager of FIG. 3 is sent to the ID code detecting section 19 and the message detecting section 20 via the RF amplifying section 16, the converting section 17, and the demodulating section 18. The ID code detector 19 detects the ID code ID1 [FIG. 5 (H)], and the message detector 20 detects the message M2 [FIG. 5 (I)]. The signal processing unit 21 notifies the requester that the call has been made, and also transmits the message M2 to the requester. Furthermore, the signal processing unit 21 detects the detected ID
The answerback signal AB is added to the code signal ID1 and sent to the signal processing unit 11. These ID code signals ID1
The answerback signal AB [FIG. 5 (J)] is output as a burst signal from the omnidirectional antenna 14 via the signal processing unit 11, the modulation unit 12, and the RF amplification 13.

The antenna 22 of the pager in FIG. 3 receives the burst signal and outputs it to the RF switching section 23 and the conversion section 2.
4, sent to the ID code detection unit 26 via the demodulation unit 25.
The ID code detection unit 26 detects the own station code ID1, and the message detection unit 27 detects the answerback signal AB. This answer-back signal AB is sent to the signal processing unit 32, which causes the signal processing unit 32 to stop outputting the reception confirmation signal to the modulation unit 33.

As described above, by providing the scanning antenna in the base station, the reception confirmation signal can be transmitted to the base station even with a weak transmission radio wave from the pager, and thus bidirectional data communication is possible. At the same time, a low power pager is realized. The reduction in power consumption of the pager contributes to downsizing of the circuit configuration and downsizing and weighting.

In the first embodiment, the modulators 12 and 3 are
3 and demodulators 18 and 25 use FSK modulation or FSK
Although demodulation is performed, another modulation / demodulation method, for example, a modulation / demodulation method such as DPSK or QPSK may be adopted.

In the first embodiment, the message M
Although 1 and M2 are added to the ID code for transmission, the message does not have to be added, and the present embodiment operates even if the message is not added.

Further, in the first embodiment, the signal processing section 32 of the pager repeatedly outputs the reception confirmation signal to the modulation section 33. But this repeated output is
This is an effective method for surely transmitting the reception confirmation signal to the base station, but it is not always an essential requirement. Therefore, the answerback signal output by the signal processing unit 21 of the base station is not necessarily an essential requirement as well.

Next, a second embodiment of the present invention will be described. FIG. 6 is a block diagram of the base station of the second embodiment.
Since the configuration of the base station of the second embodiment is basically the same as the configuration of the base station of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be explained.

The SG transmitter 41 synchronizes with the directional control of the directivity of the scanning antenna 15, and the non-modulated timing signal SG.
Is a device for generating. That is, as shown in FIG.
The scanning period T of the directivity of the scanning antenna 15 is divided into n, and the directivity direction of the scanning antenna 15 is divided directions D1 to D.
The scanning of the scanning antenna 15 is controlled so that it becomes n. Then, the SG transmission unit 41 generates the timing signal SG at the beginning of the period in which the directivity of the scanning antenna 15 faces each of the directions D1 to Dn, and outputs the timing signal SG to the RF switching unit 42. The timing signal SG has a so-called leak frequency slightly deviated from the frequency of the modulated carrier wave from the modulator 12.

The configuration of the signal processing unit 43 is basically the same as that of the signal processing unit 21 of the first embodiment. However, the signal processing unit 43 outputs the transmission switching signal to the RF switching unit 42 when the timing signal SG is output from the SG transmission unit 41.

The RF switching unit 42 is normally located on the receiving side, but is located on the transmitting side only when the transmission switching signal is sent from the signal processing unit 43, and the non-modulated timing signal SG.
Are transmitted from the scanning antenna 15.

FIG. 7 is a block diagram of the pager of the second embodiment. Since the configuration of the pager of the second embodiment is basically the same as the configuration of the pager of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only the different portions will be described. Will be explained.

The separating unit 44 is a filter for separating the modulated carrier wave from the modulating unit 12 and the timing signal SG from the SG transmitting unit 41 based on the difference in frequency,
The timing signal SG is sent to the power detection determination unit 45. The power detection determination unit 45 detects the power value of the sent timing signal SG, compares it with a predetermined level, and when the detected power value is equal to or higher than the predetermined level, sends a high power SG detection signal to the signal processing unit 46. . That is, when the pager of the second embodiment is located in the directivity direction D1 of the scanning antenna 15,
As shown in FIG. 8, the power detection determination unit 45 detects the high power timing signal SG in the direction D1 and detects the other direction D.
2 to Dn do not detect the high power timing signal SG.

In the signal processing unit 46, when the confirmation signal is input from the confirmation input unit 30, the message from the message input unit 31 is added to the local ID code signal from the ID code generation unit 29, and the unique word is added. (UW) is added and output to the modulator 33. The output timing thereof is, as shown in FIG. 8, directivity of the scanning antenna 15 when a high power SG detection signal is sent from the power detection determination unit 45. Within the direction period. When the pager is located in the directivity direction D1 of the scanning antenna 15, the directivity direction D
They are output within a period t of 1. Then, the signal processing unit 46 repeatedly executes this output each time the directivity direction of the scanning antenna 15 makes one round. In addition, the signal processing unit 46
When receiving the answerback signal from the message detection unit 27, stops the repeated execution of this output. In addition,
The signal processing unit 46 outputs the transmission switching signal to the RF switching unit 23 when outputting the output signal to the modulation unit 33.

In the second embodiment, the SG transmitter 4 of the base station
Division direction D transmitted from 1 through the scanning antenna 15
The power detection determination unit 45 of the pager receives the timing signal SG for each of 1 to Dn and determines the reception level thereof.
When the reception level is high, the pager operates the scanning antenna 1
You can see that the directivity direction of 5 is facing you. Therefore, the signal processing unit 46 of the pager is configured so that the transmission from the pager to the base station is performed only when the directivity direction of the scanning antenna 15 faces the user.
Operate. This eliminates wasteful transmission from the pager to the base station, further reducing power consumption. Specifically, since the direction of the directivity of the scanning antenna 15 is divided into the directions D1 to Dn, the power consumption becomes 1 / n as compared with the first embodiment.

In the above second embodiment, as shown in FIG. 8, the output of the signal processing unit 46 of the local ID code signal, the message, and the unique word from the signal processing unit 46 to the modulator 33 is from the power detection determination unit 45. This is randomly performed within the period t in the directivity direction of the scanning antenna 15 when the high power SG detection signal is sent, but instead of this, as shown in FIG. 9, this period t is changed to the timing signal SG. Except for the input period, time division may be performed in advance in T1 to Tp, and transmission from the pager may be performed by selecting any one of the slots T1 to Tp.

Further, as shown in FIG. 10, only the specific slots T1 to T3 among the slots T1 to Tp for inserting the transmissions from the pagers in the respective directional division directions D1 to Dn of the scanning antenna 15 are inserted. May be assigned to a special pager so that the special pager can preferentially transmit to the base station.

In the second embodiment described above, the transmission timing of the transmission signal transmitted from the omnidirectional antenna 14 of the base station is not limited, but instead of this, FIG.
As shown in FIG.
Omnidirectional antenna 14 only during the period when it is not output from
You may make it transmit from. By doing so, the transmission from the omnidirectional antenna 14 and the scanning antenna 15
It is possible to use the same frequency as the transmission from.

Next, a third embodiment of the present invention will be described. FIG. 12 is a block diagram of the base station of the third embodiment. Since the configuration of the base station of the third embodiment is basically the same as the configuration of the base station of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be explained.

The TW generator 47 generates a timing word (TW) consisting of a predetermined code. As shown in the upper part of FIG. 14, this timing word is generated in the frontmost section t0 of those sections t for each of the directivity directions D1 to Dn of the scanning antenna 15. The signal processing unit 48 is
The ID code signal, the message signal, and the unique word signal are combined to form the remaining section (t-t0) of the section t0.
During this period, the timing word from the TW generation unit 47 is sent to the modulation unit 12 as well as to the modulation unit 12 during the section t0. Further, the signal processing unit 48, during the section t0,
The TW switching signal is sent to the RF switching unit 49 and the RF switching unit 50.
Send to.

When the TW switching signal is not input, the RF switching section 49 sends the modulated wave of the composite signal of the ID code signal, the message signal and the unique word signal to the omnidirectional antenna 14, and the TW switching signal is input. At times, the modulated wave of the timing word is sent to the RF switching unit 50. Both of these modulated waves are modulated by the same modulation method. The RF switching unit 50 is located on the reception side when the TW switching signal is not input, and is located on the transmission side when the TW switching signal is input and sends the modulated wave of the timing word to the scanning antenna 15.

FIG. 13 is a block diagram of a pager according to the third embodiment. Since the configuration of the pager of the third embodiment is basically the same as the configuration of the pager of the first embodiment,
The same components are designated by the same reference numerals, the description thereof will be omitted, and only different portions will be described.

The TW detector 51 monitors whether or not the demodulated signal contains a timing word, and when detecting the timing word, outputs a TW detection signal to the signal processor 52. That is, when the direction of the directivity of the scanning antenna 15 of FIG. 12 faces the position of the pager shown in FIG.
If the direction of the directivity of the scanning antenna 15 at that time is D1, as shown in the lower part of FIG. 14, a high-level timing word can be detected only in the direction D1.
Since the timing word sent from the scanning antenna 15 is modulated by the same modulation method as the signal from the omnidirectional antenna 14 and sent, the RF amplification unit 1 of the pager 1
6, the conversion unit 17, and the demodulation unit 18 can be used also for receiving the timing word, and the timing word is modulated and sent, so that C / C compared to the unmodulated timing signal SG of the second embodiment. N has been improved.

In the signal processing unit 52, when the confirmation signal is input from the confirmation input unit 30, the message from the message input unit 31 is added to the local ID code signal from the ID code generation unit 29, and the unique word is added. (UW) is added and output to the modulator 33, but the output timing is within the period in the directivity direction of the scanning antenna 15 when the TW detection signal is sent from the TW detection unit 51. Then, the signal processing unit 52 repeatedly executes this output every time the directivity direction of the scanning antenna 15 makes one round. When the signal processing unit 52 receives the answerback signal from the message detection unit 27, the signal processing unit 52 stops the repeated execution of this output. The signal processing unit 52 outputs the transmission switching signal to the RF switching unit 23 when outputting the output signal to the modulation unit 33.

In the third embodiment, the TW generator 4 of the base station
Division direction D transmitted from 7 through scanning antenna 15
The timing word modulated signal for each 1 to Dn is received and demodulated by the pager, and the TW detection unit 51 detects the timing word. This detection is performed in a good C / N state,
Accurately detected. Then, by this detection, the pager can know that the directivity direction of the scanning antenna 15 is opposed to itself. Therefore, the signal processing unit 52 of the pager is operated so that the transmission from the pager to the base station is performed only when the directivity direction of the scanning antenna 15 faces the user. This eliminates wasteful transmission from the pager to the base station, further reducing power consumption.

In the second and third embodiments described above, the directivity dividing directions D1 to D1 of the scanning antenna 15 are set.
Although the time widths of Dn are the same, instead of this, each communication amount from each pager in the division directions D1 to Dn in the base station (for example, the number of answerback signals).
May be measured, and each time width of the division directions D1 to Dn may be increased in proportion to the communication amount. As a result, it is possible to deal with a case where pagers are concentrated in a specific dividing direction, and it is possible to improve transmission efficiency.

Next, a fourth embodiment of the present invention will be described. The base station of the fourth embodiment has the same configuration as the base station of the first embodiment. Therefore, the description of the base station is omitted. FIG. 15 is a block diagram of a pager according to the fourth embodiment. Since the configuration of the pager of the fourth embodiment is basically the same as the configuration of the pager of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only different portions will be described. Will be explained.

The pager of the fourth embodiment is provided with, for example, three antennas 53 to 55, and these antennas 53 to 55 are used.
It has an RF switching unit 59 for selecting one of them. The power detection unit 56 is provided in each of the antennas 53 to 55.
To 58 are connected, and these power detection units 56 to 58 detect the reception power of the signal input from each antenna. Each detected received power is input to the control unit 60, and the control unit 60
Compares them and selects the antenna that has sent the maximum received power and outputs a selection signal to the RF switching unit 59. R
The F switching unit 59 outputs the reception signal from the antenna designated by the selection signal to the conversion unit 24, and at the same time, the signal processing unit 3
According to the transmission switching signal from 2, the modulated signal from the modulator 33 is output to the designated antenna.

As described above, it is possible to improve the communication quality by selecting an antenna having a high received power to enhance the receiving sensitivity and further using the antenna for transmission.
Note that each of the antennas 53 to 55 of the fourth embodiment described above may be provided with directivity.

Next explained is the fifth embodiment of the invention. The base station of the fifth embodiment has the same configuration as the base station of the first embodiment. Therefore, the description of the base station is omitted. FIG. 16 is a block diagram of the pager of the fifth embodiment. Since the configuration of the pager of the fifth embodiment is basically the same as the configuration of the pager of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only different portions will be described. Will be explained.

The pager of the fifth embodiment is equipped with, for example, three antennas 61 to 63, and these antennas 61 to 63 are used.
Conversion unit 65 for converting each received signal of
To 67, and demodulation units 68 to 70 for FSK demodulating each IF signal. The RF switching unit 64 connects each antenna to each conversion unit while it does not receive the transmission switching signal. The error detectors 71 to 73 include the demodulators 68 to
The code error rate is detected based on each FSK demodulated signal output from 70 and output to the switching unit 74. Switching unit 74
Compares the code error rates sent from the error detectors 71 to 73, selects the best FSK demodulated signal, and outputs it to the ID code detector 26. Also, the switching unit 74 notifies the signal processing unit 75 of the reception system that has output the selected FSK demodulated signal.

The configuration of the signal processing unit 75 is basically the same as the configuration of the signal processing unit 32 of the first embodiment. However, R
When the transmission switching signal is sent to the F switching unit 64, the switching unit 74
The reception system notified by the above is also notified to the RF switching unit 64. Upon receiving the transmission switching signal, the RF switching unit 64 performs switching connection so that transmission is performed from the antenna of the reception system that is simultaneously notified.

In this way, the communication quality can be improved. Next, a sixth embodiment of the present invention will be described. FIG. 17 is a block diagram of the base station of the sixth embodiment. Since the configuration of the base station of the sixth embodiment is basically the same as the configuration of the base station of the first embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be explained.

The signal processing unit 77 synthesizes the ID code signal, the message signal, and the unique word signal and outputs them to the modulating unit 12. The output is synchronized with each direction of the directivity of the scanning antenna 15. Try to do it. That is, as shown in FIGS. 19A to 19C, for example, the ID code ID1, the message M1 and the like are positioned in the slot T1 that constitutes the directivity dividing direction D1 of the scanning antenna 15 and output to the modulator 12. . Then, the signal processing unit 77 outputs an output timing signal indicating the output timing to the position detection unit 76. Here, the ID code detector 78 and the position detector 76 will be described later with reference to FIG.

FIG. 18 is a block diagram of a pager according to the sixth embodiment. Since the configuration of the pager of the sixth embodiment is basically the same as the configuration of the pager of the first embodiment,
The same components are designated by the same reference numerals, the description thereof will be omitted, and only different portions will be described.

The configuration of the ID code detecting section 79 is basically the same as the configuration of the ID code detecting section 26 of the first embodiment. However, the ID code detection unit 79 outputs the ID code detection signal to the signal processing unit 80 immediately after detecting the ID code for the own station. That is, as shown in FIG. 19D, after the propagation time τ1 from the base station to the pager, I
The D code detection unit 79 detects the ID code for itself, and outputs an ID code detection signal to the signal processing unit 80.

The configuration of the signal processing unit 80 is basically the same as the configuration of the signal processing unit 32 of the first embodiment. However,
Even if the confirmation signal is input from the confirmation input unit 30, the signal processing unit 80 does not output until it receives the ID code detection signal from the ID code detection unit 79, and outputs it immediately after receiving the ID code detection signal. I do. As a result, FIG.
As shown in 9E, the pager transmits the ID code ID1, the message M2, and the like after the internal processing time τ2.

Returning to FIG. 17, the configuration of the ID code detecting section 78 is basically the same as the configuration of the ID code detecting section 19 of the first embodiment. However, the ID code detector 78
When detecting the ID code, outputs an output timing signal indicating the output timing to the position detecting section 76. That is, as shown in FIG. 19F, after the propagation time τ1 from the pager to the base station, the ID code detection unit 78 detects the ID code and outputs the output timing signal to the position detection unit 76.

In addition to the output timing signal from the signal processing unit 77 and the output timing signal from the ID code detecting unit 78, the position detecting unit 76 also receives data on the directivity of the scanning antenna 15. The position detection unit 76 subtracts the processing time τ2 from the input time difference τ between the output timing signal from the signal processing unit 77 and the output timing signal from the ID code detection unit 78, divides it by 2, and further multiplies it by the light speed C. [([Tau]-[tau] 2) / 2 * C] The distance between the base station and the pager is calculated, and the spatial position of the pager is calculated and output using the data of the directionality of the scanning antenna 15. The data on the spatial positions of these pagers are used for services to call requesters.

As shown in FIG. 19 (G), since the transmission chance from the pager to the base station exists every period T of the scanning antenna 15, the distance is calculated by the input time difference τ.
Can be calculated by subtracting an appropriate multiple of this cycle T from.

Next, a seventh embodiment of the present invention will be described. The seventh embodiment relates to a case where a plurality of base stations are set and there is a control center that controls the plurality of base stations.

FIG. 20 is a block diagram of one base station among a plurality of base stations of the seventh embodiment. Both base stations have the same configuration. Since the configuration of the base station of the seventh embodiment is basically the same as the configuration of the base station of the third embodiment, the same components are designated by the same reference numerals, and the description thereof will be omitted. Only the part will be explained.

The AC generator 81 generates an antenna code (AC) consisting of a predetermined code. This antenna code is a code unique to the scanning antenna 15. The signal processing unit 82 combines the antenna code sent from the AC generation unit 81 into an ID code signal, a message signal, and a unique word signal, and sends them to the modulation unit 12. Here, the signal processing unit 83, the registration processing unit 84, and the interface 85 will be described later with reference to FIG.

FIG. 21 is a block diagram of the pager of the seventh embodiment. Since the configuration of the pager of the seventh embodiment is basically the same as the configuration of the pager of the third embodiment,
The same components are designated by the same reference numerals, the description thereof will be omitted, and only different portions will be described.

The AC detection unit 86 detects the antenna code included in the demodulated signal and outputs it to the AC comparison unit 87. A
The C comparison unit 87 stores the antenna code sent from the AC detection unit 86, compares the newly sent antenna code with the stored antenna code, and only when there is a difference, the new antenna code is sent. The signal is output to the signal processing unit 88. The case where the antenna code is different means the case where the position of the pager is moved and the signal is received from a scanning antenna different from the conventional scanning antenna.

The configuration of the signal processing unit 88 is basically the same as the configuration of the signal processing unit 52 of the third embodiment. However, A
When the new antenna code is sent from the C comparison unit 87, the ID
In addition to the code, message, etc., it is sent to the modulator 33.

Returning to FIG. 20, when the demodulated signal includes an antenna code, the signal processing unit 83 outputs the antenna code to the registration processing unit 84. Registration processing unit 8
Reference numeral 4 sends the ID code to which the antenna code has been added together with the antenna code to a control center (not shown) via the interface 85, and the pager having the ID code determines which base station (actually the scanning antenna) belongs to. Register if you are in the service zone.

Therefore, when calling the pager next time, since the control center knows the service zone in which the pager is located, the call can be made only from the base station of the zone, thereby effectively using the frequency. It is possible to improve the transmission efficiency.

Next, an eighth embodiment of the present invention will be described. The pager of the eighth embodiment has the same structure as the pager of the third embodiment. Therefore, the description is omitted. FIG. 22 is a block diagram of the base station of the eighth embodiment. Since the configuration of the base station of the eighth embodiment is basically the same as the configuration of the base station of the third embodiment, the same components are designated by the same reference numerals and their description is omitted and different. Only the part will be explained.

In the eighth embodiment, a scanning antenna 89 is provided in place of the omnidirectional antenna 14 of the third embodiment,
Further, there is an antenna control unit 90 connected to the scanning antenna 89 and the scanning antenna 15, and there is no RF switching unit 49 or RF switching unit 50 of the third embodiment.

The antenna control unit 90 follows the processing timing of the timing word sent from the signal processing unit 91,
The scanning control of the scanning antenna 89 and the scanning control of the scanning antenna 15 are performed in synchronization. Therefore, it becomes possible to perform bidirectional communication when the scanning antenna 89 and the scanning antenna 15 face the pager, and it is possible to improve the frequency utilization efficiency without wastefully emitting radio waves in the direction where the pager is not present. And high sensitivity can be achieved.

Further, if the pager position information is known in advance, these effects are further enhanced. Next,
A ninth embodiment of the present invention will be described. The pager of the ninth embodiment has the same structure as the pager of the third embodiment.

FIG. 23 is a block diagram of a base station according to the ninth embodiment. Since the configuration of the base station of the ninth embodiment is basically the same as the configuration of the base station of the third embodiment, the same components are designated by the same reference numerals and their description is omitted and different. Only the part will be explained.

In the ninth embodiment, the omnidirectional antenna 14 and the RF switching unit 49 of the third embodiment are not provided, and the RF amplification unit 13 is directly connected to the RF switching unit 50. Signal processing unit 9
24, the division directions D1 to Dn in the first half Tt of the unit scanning period T of the scanning antenna 15 are shown in FIG.
Send for each. Then, from the pager, in the second half Tr of the unit scanning period T, the respective division directions I1 to In
Send for each.

As a result, the base station transmission frequency and the base station reception frequency can be made to coincide with each other, and the frequency can be effectively used. Still further, as shown in FIG.
It is possible to provide a time zone Tm between the first half Tt and the second half Tr of the unit scanning period T so that the time zone Tm can be used for communication between pagers.

In each of the above embodiments, a pager is illustrated as a mobile station, but the present invention is not limited to a pager as a mobile station. For example, a telephone two-way radio communication device or data of a cellular system can be used. It may be a communication device.

Further, in each of the above-described embodiments, not only the direction of the directivity of the scanning antenna is scanned in the horizontal direction but also in the vertical direction, even if the scanning antenna is on a high tower. It may be possible to sufficiently receive from a pager near the tower. Further, when transmitting from such a scanning antenna, the output power of the transmission away from the tower may be high and the output power of the transmission near the tower may be low.

Further, in each of the above embodiments, as shown in FIG. 26, the scanning antenna 15 is divided into, for example, four surfaces 15a to 15d arranged at intervals of 90 degrees, and the directivity direction 15e formed by each surface is formed. You may make it control so that 15h may be always 90 degrees away from each other. As a result, the scanning time can be shortened and the interference due to the same frequency can be reduced in the case of transmission.

[0088]

As described above, in the present invention, when the mobile station detects its own station code, it transmits the own station code of the mobile station to the base station by a weak radio wave. The base station scans the scanning antenna to change the direction of directivity and captures a weak radio wave from the mobile station to detect the mobile station code included in the received signal. This informs the client that the mobile station has been called. In this way, the notification that the mobile station has surely received the call from the base station is reliably transmitted from the mobile station to the base station by a weak radio wave. That is, by using the scanning antenna, the transmission from the mobile station to the base station may be a weak radio wave, therefore the power consumption of the mobile station is low, and the transmission circuit of the mobile station for transmitting a weak radio wave is also used. A small circuit configuration will suffice.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram of a base station according to the first embodiment.

FIG. 3 is a block diagram of a pager according to the first embodiment.

FIG. 4 is a configuration diagram of a scanning antenna.

FIG. 5 is a timing chart of signals of respective parts.

FIG. 6 is a block diagram of a base station according to a second embodiment.

FIG. 7 is a block diagram of a pager according to a second embodiment.

FIG. 8 is a diagram showing an unmodulated timing signal.

FIG. 9 is a diagram of transmission timing from a pager.

FIG. 10 is an explanatory diagram of transmission allocation from a pager.

FIG. 11 is a diagram of transmission timing of a base station.

FIG. 12 is a block diagram of a base station according to a third embodiment.

FIG. 13 is a block diagram of a pager according to a third embodiment.

FIG. 14 is a diagram showing transmission / reception of a timing word.

FIG. 15 is a block diagram of a pager according to a fourth embodiment.

FIG. 16 is a block diagram of a pager according to a fifth embodiment.

FIG. 17 is a block diagram of a base station according to a sixth embodiment.

FIG. 18 is a block diagram of a pager according to a sixth embodiment.

FIG. 19 is a diagram showing transmission / reception timing of a base station.

FIG. 20 is a block diagram of a base station according to a seventh embodiment.

FIG. 21 is a block diagram of a pager according to a seventh embodiment.

FIG. 22 is a block diagram of a base station according to an eighth embodiment.

FIG. 23 is a block diagram of a base station according to a ninth embodiment.

FIG. 24 is a diagram of transmission / reception timing in a base station.

FIG. 25 is a signal layout diagram for inter-pager communication.

FIG. 26 is a multi-sided configuration diagram of a scanning antenna.

[Explanation of symbols]

 1 Mobile Station 1a Own Station Code Detecting Means 1b Own Station Code Sending Means 1c Repeat Execution Means 1d Answerback Receiving Means 1e Stopping Means 2 Base Station 2a Scanning Antenna 2b Mobile Station Code Detecting Means 2c Informing Means 2d Omnidirectional Antenna 2e Code Sending Means 2f Answerback means 3 Client

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location H04B 7/26

Claims (17)

[Claims] 1. A mobile communication system composed of a base station and a plurality of mobile stations, the mobile station being provided in a mobile station (1) and detecting the transmission of its own code from the base station (2). Code detection means (1
a) and when the own station code detection means (1a) provided in the mobile station (1) detects the transmission of the own station code from the base station (2), the own station code is sent to the base station (1). 2), a local station code transmitting means (1b), a scanning antenna (2a) provided in the base station (2), having a directivity and capable of scanning the direction of the directivity, the base station (2) ), The scanning antenna (2
A mobile communication system comprising: a mobile station code detecting means (2b) for detecting a mobile station code included in the received signal received in a). 2. A client (3), which is provided in the base station (2) and requests to call a mobile station corresponding to a mobile station code detected by the mobile station code detecting means (2b).
The mobile communication system according to claim 1, further comprising an informing means (2c) for informing that the call has been made. 3. The base station (2) further comprising an omnidirectional antenna (2d) provided in the base station (2), which has no directivity and transmits a transmission signal including a mobile station code in all directions. The mobile communication system according to item 1. 4. A code transmitting means (2e) which is provided in the base station (2), receives a call request from a predetermined mobile station, and transmits the code of the predetermined mobile station from the omnidirectional antenna (2d). The mobile communication system according to claim 3, further comprising: 5. A mobile station code and an answer, which are provided in the base station (2) and are detected by the mobile station code detecting means (2b) when the mobile station code detecting means (2b) detects the mobile station code. Answer back means (2f) for transmitting a back signal from the omnidirectional antenna (2d)
And a repetitive execution means (1c) provided in the mobile station (1) for causing the local station code transmission means (1b) to repeatedly execute transmission of the local station code to the base station (2). An answerback receiving means (1d) provided in the station (1) for receiving a mobile station code and an answerback signal for the own station from the answerback means (2f) of the base station (2); 1), and when the answerback receiving means (1d) receives the mobile station code for the own station and the answerback signal, the repeat execution means (1
The operation of c) is stopped and the local station code transmitting means (1
The mobile communication system according to claim 1, further comprising: stop means (1e) for stopping transmission of the own station code to the base station (2) by b). 6. A mobile station (1) is provided, and when the local station code transmitting means (1b) transmits a local station code to the base station (2), a message is transmitted along with the local station code. Message sending means, and the scanning antenna (2) provided in the base station (2)
The mobile communication system according to claim 1, further comprising: message detection means for detecting a message included in the received signal received in a). 7. A timing signal which is provided in the base station (2) and which transmits a non-modulated timing signal from the scanning antenna (2a) for each directionality of the plurality of divided scanning antennas (2a). Transmitting means; and a power value detecting means provided in the mobile station (1) for receiving the timing signal transmitted from the timing signal transmitting means of the base station (2) and detecting the power value of the received timing signal. Provided in the mobile station (1), when the power value detected by the power detection means is equal to or higher than a predetermined level, the own station in the directivity direction division section of the scanning antenna (2a) that has transmitted the timing signal. The mobile communication system according to claim 1, further comprising: transmission control means for operating the code transmission means (1b). 8. The base station (2) is provided, receives a call request of a predetermined mobile station, and transmits a code of the predetermined mobile station during a period in which the timing signal transmitting means does not transmit a timing signal. The mobile communication system according to claim 7, further comprising code transmitting means for transmitting from the omnidirectional antenna (2d) by a carrier wave having the same frequency as the carrier wave of the timing signal. 9. A timing for transmitting a modulated timing word from the scanning antenna (2a), which is provided in the base station (2), for each directionality of a plurality of divided directivity of the scanning antenna (2a). Word transmitting means, and timing word detecting means provided in the mobile station (1) for detecting the timing word by receiving and demodulating the timing word transmitted from the timing word transmitting means of the base station (2). When the timing word detecting means is provided in the mobile station (1) and detects a timing word, the local station code transmitting means (in the directivity direction division section of the scanning antenna (2a) that has transmitted the timing word ( 1
The mobile communication system according to claim 1, further comprising: a transmission control unit that operates b). 10. The base station (2) is provided, receives a call request from a predetermined mobile station, and transmits a code of the predetermined mobile station during a period in which the timing word transmitting means does not transmit a timing word, The omnidirectional antenna (2
10. The mobile communication system according to claim 9, further comprising code transmitting means for transmitting from d). 11. A plurality of mobile station antennas provided in the mobile station (1), and monitoring for monitoring a reception state of each reception signal provided in the mobile station (1) and received from each mobile station antenna. And an antenna provided in the mobile station (1) for receiving a reception signal from the mobile station antenna in the best reception state based on the monitoring result of the monitoring means and transmitting from the best mobile station antenna. The mobile communication system according to claim 1, further comprising: selecting means. 12. The mobile station, which is provided in the base station (2), receives a call request from a predetermined mobile station, and transmits a code of the predetermined mobile station from an omnidirectional antenna (2d). Immediately, when the mobile station (1) receives the own station code transmitted from the base station (2), the own station code is transmitted to the base station (2) provided in (1). A transmitting means, a time when the code transmitting means is provided in the base station (2), transmits the code of the predetermined mobile station, and a self-code transmitted from the local station code immediate transmitting means of the mobile station (1). Based on the timing when the station code is received by the base station (2) and the direction of the directivity that the scanning antenna (2a) was facing when the mobile station code detecting means detected the mobile station code. The spatial position of the mobile station of Mobile communication system according to claim 1, further comprising a position detecting means. 13. A plurality of base stations having the configuration of the base station (2), a control center that controls the plurality of base stations, an antenna that is provided in each of the base stations and is specific to the scanning antenna from the scanning antenna. An antenna code transmitting means for transmitting a code; an antenna code storing means provided in the mobile station (1) for receiving and storing an antenna code transmitted from the antenna code transmitting means of the base station; The antenna code transmitted from the antenna code transmitting means of the base station provided in 1) is compared with the antenna code stored in the antenna code storing means, and when the two are different, the new antenna code is determined to be the new antenna code. New antenna code transmitting means for transmitting the own station code to the corresponding base station; and a new antenna code transmitting means provided in each of the base stations for the mobile station (1). Registration means for registering the new antenna code and the mobile station code transmitted from the na-code transmitting means in the control center as position information indicating the spatial position of the mobile station (1). The mobile communication system according to item 1. 14. A base station in a zone in which the predetermined mobile station is located is provided in the control center, receives a call request from a predetermined mobile station, and determines a base station in a zone in which the predetermined mobile station is located, based on the position information registered by the registration means. 14. The mobile communication system according to claim 13, further comprising a plurality of base station control means for operating the determined base station to execute calling of the predetermined mobile station. 15. A scanning antenna for mobile station code transmission, which is provided in the base station (2), has a directivity, can scan the direction of the directivity, and transmits the code of a predetermined mobile station that has received a call request. And the scanning antenna (2) provided in the base station (2).
15. The mobile communication system according to claim 14, further comprising: a synchronization unit that synchronizes the directivity direction of a) with the directivity direction of the mobile station code transmitting scanning antenna. 16. A scanning antenna transmission control means provided in the base station (2) for transmitting a mobile station code from the scanning antenna (2a), and the scanning antenna (2) provided in the base station (2).
a)) an operation control means for operating the scanning antenna transmission control means for each of the plurality of divided directional directions of the scanning antenna (2a) during the first half of one unit scanning cycle; 1), and the local station code transmitting means (1b) for each direction of the directivity divided into a plurality of the scanning antennas (2a) during the latter half period of the unit scanning period.
The mobile communication system according to claim 1, further comprising: transmission control means for activating. 17. The mobile communication system according to claim 1, wherein the scanning antenna (2a) is a phase array antenna.