JPH11145890A - Avm-based mobile radio system, base station radio equipment and mobile station radio equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radio system, with which efficiency of information collection is improved by reducing the chance of calling signal collision among plural pieces of mobile station radio equipment. SOLUTION: A base station FB is provided with a timing processing means for sending a call origination timing signal 'tf' for specifying the call orgination timing of each mobile station continuously at fixed time intervals to plural mobile stations M1-M3, and a transmission processing means for compositing and transmitting response codes (a), (b), (c), (d) and (e) to the mobile station corresponding to the call origination timing signal, when arbitrary calling signals A, B, C, D and E from respective mobile stations are signals requesting confirmation responses. Each mobile station is provided with a means for receiving the call origination timing signal from the base station and for generating a timing pulse synchronized with the received call origination timing signal, and transmits the arbitrary calling signal at a transmission timing specified by this timing pulse.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AVM (Automatic Vehicle Mon) in a mobile radio system for monitoring the operation status of a large number of vehicles such as taxis in a central control room and rationalizing the operation management.
The present invention relates to a mobile radio system to which an itoring method is applied, a base station radio apparatus for the same, and a mobile station radio apparatus.

[0002]

2. Description of the Related Art Conventionally, in this type of AVM system, in order to eliminate a time waiting state in information collection by a polling system from a base station, the base station is changed when a position, a business state, or the like of a mobile station changes. Information is collected in real time by the optional calling system that reports to the company, and efficient operation management is performed. In this system, any mobile station can make an arbitrary call even during transmission of an arbitrary call signal from one mobile station. For this reason, there is a case where the content of both signals interferes to make it impossible to decode at the base station. In order to cope with this, a system in which an acknowledgment signal is transmitted from the base station and the mobile station that does not receive the acknowledgment signal may be improved so that the arbitrary call signal is re-called after an appropriate time has elapsed. It is in operation.

However, gyroscopes and GPS (Gl
With the advance of the technology of automatic vehicle position detection using an obal Positioning System, a more accurate vehicle situation can be instantaneously obtained, and the frequency of arbitrary calls from each mobile station is increasing dramatically. Also,
Even in a system having a large number of operating mobile stations, the total number of arbitrary calls from each mobile station is large. In such a situation, there are also disadvantages in system operation, such as an increased chance of collision of an arbitrary call signal from the mobile station, an increase in the number of recalls, and difficulty in real-time information collection. doing.

Referring to FIGS. 6 and 7, an example of a conventional arbitrary calling system in the case of a two-frequency half-duplex system will be described. In FIG. 6, FB is a base station radio apparatus (hereinafter, referred to as a base station radio apparatus).
M1 to M3 are mobile station radio apparatuses (hereinafter abbreviated as mobile stations), Tx is a transmission signal of each radio apparatus, and Rx is a reception signal of each radio apparatus. In addition, Tc indicates the recall control state of the mobile station, and Ts indicates the time when the mobile station enters an arbitrary call state on a time axis set for explaining the operation. At time T1, mobile station M1
Shows a process of transmitting an arbitrary call signal A requiring a response from the base station and returning a response confirmation signal a by the base station FB. Time T
2. At T3, the mobile station M3 sends out an optional call signal B requiring a response, and while the response confirmation signal b is being returned from the base station FB, an optional call signal requiring a response from the mobile station M1. The case where the call signal C is transmitted is shown. Time T
4, T5 shows the operation when the arbitrary calling signals D and E requiring a response are transmitted from the mobile stations M3 and M2 at substantially the same time. The base line of Tx and Rx indicates the time zone in the transmission or reception state by a thick line.

Referring to FIGS. 7 and 8, the configuration and operation of a conventional two-frequency half-duplex base station FB and a mobile station using an arbitrary call format will be described. When the arbitrary call signal A is transmitted from the mobile station M1 at time T1, the arbitrary call signal A is received by the base station FB through the antenna 11 and the receiver 12, and is sent to the identification unit 13. When the discrimination unit 13 discriminates that the arbitrary call signal A is code information, the switching circuit 1
4 is switched to the decoding unit 17 side. In this case, the arbitrary call signal A is sent to the decoding unit 17 and the code decoding unit 31, and when a response is required, the response code generation unit 32 generates the response code a. This response code a is transmitted through the transmission signal generator 34, the switching circuit 27, the transmitter 28, and the antenna 29.

[0006] On the other hand, the mobile station M that has sent the arbitrary call signal A
The re-call control unit 68 enters a re-call waiting state and starts measuring the waiting time tw. Response code a from base station FB
Is received by all the mobile stations M1 to M3. In each mobile station,
The antenna 91, the transmission / reception switching circuit 92, and the receiver 5 shown in FIG.
1, the response code a is received, and is identified by the identification unit 52 as code information.

As a result, the identification unit 52 switches the switching circuit 53 to the decoding unit 56 side, and the response code a is decoded by the decoding unit 56 and sent to the code decoding unit 71. The recall control unit 68 of the mobile station M1 confirms that the signal from the code decoding unit 71 is a response to the own station within the waiting time, cancels the recall call waiting state, and shifts to a corresponding series of processing. However, the decoding sections 71 of the other mobile stations M2 and M3 confirm that they are not related to their own stations and end the processing.

[0008] At time T2, the mobile station M3 sends an arbitrary call signal B
Also, the response code b is processed in the above-described process between the base station FB and the mobile station M3. Further, a time T3 during which the response code b is transmitted from the base station FB to the mobile station M3.
Even if the arbitrary call signal C is transmitted from the mobile station M1,
Since the base station FB is operated by the frequency half-duplex system, the base station FB receives the signal and transmits a required response code c following the response code b.

At times T4 and T5, mobile stations M3 and M2 successively send outgoing call signals D and E, respectively.
In B, the signal is received in the interference state, the code cannot be decoded, and no response code is transmitted. In the mobile stations M3 and M2, the recall control unit 6 activated by the arbitrary call signals D and E requiring a response.
In No. 8, since the response code cannot be received even after the time tws until the re-calling set in the system elapses, the delay times tr3 and tr2 by random numbers are set, and the arbitrary calling signal D is set to the time T
7 as an arbitrary call signal D ', the arbitrary call signal E is at time T
6 and re-call each as an arbitrary call signal E '. The base station FB receiving these arbitrary calling signals returns response codes d 'and e' as shown in the figure.

FIG. 9 shows a transmission / reception process similar to that of FIG. 6 in the case of a conventional one-frequency simplex system using an arbitrary call format. FIG. 10 shows a configuration of a base station for that purpose, which is the same configuration except that transmission and reception are alternately switched via one antenna. The configuration of the mobile station is the same as the configuration shown in FIG.

In FIG. 9, the arbitrary call signal C of the mobile station M1 which is calling while transmitting the response code b to the arbitrary call signal B from the mobile station M3 which has called at time T2 can be received only partially. The response code is not sent out because it cannot be decoded. Therefore, the re-calling control unit 68 of the mobile station M1 waits for the time tws in the above-described process, sets the delay time tr1 with a random number, and sends out the re-calling signal C 'at time T3'.

[0012]

In any case, in the conventional method, as the number of mobile stations increases, the probability of collision of an arbitrary call signal increases even in the case of re-calling until the connection with the base station FB is established. There is a problem that the waiting time is long.

It is an object of the present invention to provide a mobile radio system capable of reducing the chance of a call signal collision between a plurality of mobile station radio apparatuses and improving the efficiency of information collection. .

Another object of the present invention is to provide a base station radio apparatus suitable for the mobile radio system.

Another object of the present invention is to provide a mobile station radio apparatus suitable for the mobile radio system.

[0016]

SUMMARY OF THE INVENTION A base station radio apparatus according to the present invention provides a two-frequency half-duplex system or a one-frequency simplex system for communicating with a plurality of mobile station radio apparatuses in an arbitrary calling format. Timing processing means for applying a call timing signal for defining a call timing of each mobile station radio apparatus to the plurality of mobile station radio apparatuses continuously at a constant time interval, A transmission process for combining and transmitting a response code to the mobile station radio device corresponding to the call timing signal when the arbitrary call signal from each mobile station radio device is a signal requesting an acknowledgment response Means.

[0017] The transmission processing means may add an arbitrary call termination / arrangement to the call timing signal in addition to the response code.
A release control signal, an individual call signal, and a district polling signal can be combined and transmitted.

A mobile station radio apparatus according to the present invention uses an AVM based on a two-frequency half-duplex system or a single-frequency simplex system in order to communicate with the above-mentioned base station radio apparatus in an arbitrary calling format.
A means for receiving the call timing signal from the base station radio apparatus and generating a timing pulse synchronized with the received call timing signal, the transmission timing being defined by the timing pulse. An arbitrary call signal is transmitted.

According to the present invention, there is further provided a mobile radio system including the base station radio apparatus and the plurality of mobile station radio apparatuses.

[0020]

According to the present invention, the transmission timing of an arbitrary call signal from the mobile station radio apparatus is set to a time regulated by the call timing signal continuously transmitted from the base station radio apparatus at fixed time intervals. , The chance of collision of an arbitrary call signal with another mobile station radio apparatus is reduced. Also, by including the acknowledgment code to the mobile station radio device in the call timing signal, it is possible to re-call the mobile station that could not obtain the acknowledgment due to noise interference or collision of arbitrary call signal, It ensures that more information can be collected.

Specifically, in a base station radio apparatus,
A call timing signal is continuously transmitted to a plurality of mobile station radio apparatuses at a constant time interval. In the mobile station radio apparatus, the transmission timing of an arbitrary call signal including code information such as a business state, a dynamic change, a position change, and a call request is adjusted to a time regulated by the call timing signal.

At the same time, the base station radio apparatus combines the call timing signal with an acknowledgment code to the mobile station radio apparatus, an arbitrary call stop / release control signal, an individual call signal, a district polling signal, and the like. Send. On the mobile station radio apparatus side, when the call timing signal received after the arbitrary call does not include the acknowledgment code for the own station, when responding to the district polling from the base station radio apparatus, In the case where arbitrary calling signals simultaneously called by a plurality of mobile station radio apparatuses may collide, such as when the arbitrary call suspension is released, after a delay time set by a random number elapses, the base station A call is made at a time specified by a call timing signal from the wireless device.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a base station radio apparatus (hereinafter, referred to as a base station) and a mobile station radio apparatus (hereinafter, referred to as a base station) according to the present invention.
A preferred embodiment will be described with reference to the drawings. FIG. 1 shows a configuration of a base station of a two-frequency half-duplex system as a preferred embodiment of the present invention. As can be seen from FIG. 1, the receiving system 1 and the transmitting system 2 are operated by a two-frequency half-duplex system, so that the base station can transmit the code, wait, or talk to a certain mobile station. Even in the state, it is possible to receive, decode, and quickly process information encoded by an arbitrary call from a mobile station.

The code processing system 3 encodes response information to the mobile station based on the decoded information from the mobile station,
It generates and stores codes required by the system, such as confirmation of the current dynamics and position of the mobile station, dispatch of vehicles, call stop / release commands, and the like.

The timing processing system 4 is a characteristic part of the present invention, and performs system time generation, timing signal generation, and the like.

The receiving system 1 has an identification unit 13 for identifying whether the input signal from the mobile station received by the receiver 12 through the antenna 11 is a voice signal or a code information signal. Receiver 12
Is output from a switching circuit 14 controlled by the identification unit 13.
Accordingly, in the case of an audio signal, the audio signal is connected to the audio amplifier 15 and the speaker 16 sounds. When the output of the receiver 12 is a code information signal, the output of the receiver 12 is connected to the decoding unit 17, and the code information is decoded by the decoding unit 17 and sent to the code decoding unit 31 of the code processing system 3. .

The transmission system 2 is provided with a transmission control unit 20 for controlling transmission to a mobile station. Microphone button 23
Is pressed and the call detection unit 24 detects that voice transmission is in progress, the transmission control unit 20 switches the switching circuit 27 to the voice amplification unit 22 side, and is transmitted from the microphone 21 through the voice amplification unit 22. The audio signal is input to the transmitter 28.
When outputting various code information signals from the transmission signal generation unit 34, the transmission control unit 20 switches the switching circuit 27 to the transmission signal generation unit 34 side and outputs various code information signals from the transmission signal generation unit 34. Is input to the transmitter 28. The transmitter 28 is driven by the transmission control unit 20 and transmits an input signal from the antenna 29 to each mobile station.

In the code processing system 3, the decoded code information from the mobile station is received and decoded by the code decoding unit 31, and if response information to the mobile station is required, a response code generation unit 32 generates a response code. And sends it to the transmission signal generator 34. if,
If the code cannot be decoded by the code decoding unit 31, an unreadable signal is generated by the response code generation unit 32 and transmitted to the transmission signal generation unit 34. When any one of the operation buttons 25 is operated, a command signal for operations for dispatching a call, stopping a call, canceling a call stop, and collecting various information detected by the operation detection unit 26 is a command signal. The signal is generated by the signal generator 33 and sent to the transmission signal generator 34.

The timing processing system 4 is a main part of the present invention and controls the operation time of the system. The timing processing system 4 includes a timing pulse generator 41, a calling time generator 42, and a calling timing signal generator 43. Be composed. The timing pulse generator 41 generates a timing pulse at a fixed time interval obtained by adding a margin time to the sum of the time widths of the encoded signals used by the base station and the mobile station for transmission, and sends the timing pulse to the calling time generator 42. send. The calling time generation unit 42 controls the transmission signal generation unit 34 and the transmission control unit 20 by generating a control signal having a time width for transmitting a call timing signal transmitted by the base station. At the same time, the output of the timing pulse generator 41 is sent to the call timing signal generator 43, and an arbitrary call timing signal for regulating the arbitrary call signal of each mobile station is generated. The arbitrary call timing signal is sent to the transmission signal generator 34, combined with the signals sent from the response code generator 32, the command signal generator 33, and the like, and sent to each mobile station as a call timing signal.

FIG. 2 shows the configuration of a single-frequency simplex base station. The difference between the one-frequency simplex system and the two-frequency half-duplex system is that the antenna 11 is shared by the reception system 1 and the transmission system 2 and the transmission / reception switching circuit 18 controlled by the transmission control unit 20 controls transmission and reception. The only point that can be alternately switched. The operation as a system can be realized in the same manner as the two-frequency half-duplex system as described later.

FIG. 3 shows the configuration of a mobile station used in combination with the base station of the two-frequency half-duplex system or the one-frequency simplex system shown in FIG. 1 or FIG. That is, the mobile station can be applied to both the dual frequency half duplex system and the single frequency simplex system. This can be seen in FIG.
The reception system 5 and the transmission system 6 are connected via a transmission / reception switching circuit 92,
This is because it can be connected to a single antenna 91.

The code processing system 7 decodes the command signal from the base station based on the decoded code information from the base station, encodes the response information when a response is requested, and changes the dynamics of the mobile station. , Change of position, waiting, call request, generation of registration signal such as break, etc. are performed.

The timing processing system 8 generates a timing pulse synchronized with a call timing signal from the base station,
This is a part for controlling the calling time provided for the present invention, such as determination of an arbitrary calling condition and generation of an arbitrary calling signal synchronized with a timing pulse.

The antenna 91 is usually provided with a transmission / reception switching circuit 92.
, And is connected to the receiver 51 to operate as a receiving antenna. When the output signal of the receiver 51 is an audio signal, the identification unit 52 switches the switching circuit 53 to the audio amplification unit 54 side. The audio amplifier 54 amplifies the audio signal from the receiver 51 and makes the speaker 55 ring. When the output of the receiver 51 is code information, the identification unit 52 switches the switching circuit 53 to the decoding unit 56 side. In this case, the code information signal from the base station is decoded by the decoding unit 56 and sent to the code decoding unit 71 of the code processing system 7.

As will be described later, when the calling condition at the mobile station is satisfied, the transmission control unit 60 controlled by the signal from the calling time generation unit 83 switches the switching circuit 65 to the transmission signal generation unit 7.
Then, the code is generated and input to the transmitter 66. The transmission control unit 60 also drives the transmitter 66, switches the transmission / reception switching circuit 92 to the transmitter 66 side, and causes the antenna 91 to act as a transmission antenna.

The code processing system 7 includes a code decoding unit 71, a response code generation unit 72 when a response to the base station is required, and an arbitrary call signal generation unit 73 for automatically notifying changes in the position, dynamics, etc. of the vehicle. A registration request signal generating section 74 which is activated by various button operations for the crew to report to the base station, such as standby, call request, break, and generates a registration request signal, and transmission for encoding and transmitting these signals The signal generation unit 75 is configured. The code decoding section 71 decodes the code information decoded by the decoding section 56, separates a signal for controlling the time at which the mobile station arbitrarily calls, and sends the signal to the timing pulse generating section 81.

The contents decoded by the code decoding unit 71 include:
If an information request signal from the base station is included,
The required response signal is generated by the response code generator 72 and sent to the transmission signal generator 75. On the other hand, when the content decoded by the code decoding section 71 includes a response signal to the mobile station, the recall control section 68 analyzes whether or not the response signal is to the own station. Further, when the content decoded by the code decoding unit 71 includes a control signal for stopping / releasing an arbitrary call from the mobile station, the control unit controls the arbitrary call stop / release control unit 67.

The arbitrary call signal generating section 73 is provided when the state of the mobile station vehicle changes, such as the passage of a certain time of the vehicle, the movement of the vehicle, the passage of a specific position, the reception of a passenger, the boarding, and the operation of a toll meter during getting off. Then, an arbitrary outgoing call signal including such information is automatically generated and sent to the transmission signal generating unit 75. When the transmission signal generation section 75 generates the transmission signal, the transmission signal generation section 75 notifies the call condition detection section 82 of the call time.

The timing processing system 8 is a main part of the present invention in a part for controlling an arbitrary calling time. The code decoding unit 71 extracts the call timing signal from the base station, and activates the timing pulse generator 81 at the trailing edge of the call timing signal. The started timing pulse generator 81 sends a signal to the calling condition detector 82. The calling condition detecting unit 82
When the optional call stop / release control unit 67 is not in the call stop state and the transmission signal generation unit 75 is in the optional call waiting state, or when the optional call stop / release control unit 67 is not in the call stop state. If there is a recall procedure request from the recall controller 68, a signal is sent to the calling time generator 83. The calling time generation unit 83 generates a control signal having an arbitrary calling time width determined by the system and sends it to the transmission control unit 60. Based on this control signal, transmission control section 60 controls the transmission system so that information of transmission signal generation section 75 is transmitted from antenna 91.

If the identification signal of the own station is not detected in the acknowledgment signal for the arbitrary call signal requiring the acknowledgment, the arbitrary call waiting state is set when the arbitrary call stop is released. In the case where there is a possibility that a plurality of mobile stations may simultaneously make a call, such as when responding to a district polling, etc., a control signal of an arbitrary calling time width is not generated and the re-call control unit 68 Pass control. The re-call control unit 68 requests the re-call procedure to the call condition detecting unit 82 after the delay time generated by the random number, and the call condition detecting unit 8
2 retransmits the transmission code of the transmission signal generation unit 75 in the above procedure.

When the crew of the mobile station talks to the base station, the user presses the press button 63 and sends an audio signal to the audio amplifier 62 using the microphone 61. In addition, when the base station is notified of information such as a response, an understanding, a stand-by place of the own vehicle, a destination, a break, etc., when registering, it is composed of a plurality prepared for these purposes. One of the operation buttons 64 is pressed. The outputs of the operation button group 64 and the press button 63 are sent to a registration request signal generation unit 74, where a corresponding registration request signal is generated and sent to a transmission signal generation unit 75. Based on the registration request signal, the transmission signal generation unit 75 generates a code signal containing the target content, and notifies the calling condition detection unit 82 of the code signal. The transmission control unit 60 performs a control operation so as to transmit the code signal from the transmission signal generation unit 75 to the antenna 91 in the above-described procedure.

When a sound signal is transmitted from the microphone 61 using the press button 63, in a system in which an information signal including a microphone press code is automatically added immediately before the sound signal, the control operation is performed as follows. Done. That is, the registration request signal generation section 74 generates a registration request signal including a code indicating that the microphone is pressed, and after the transmission is completed in the above-described code signal transmission procedure, the switching circuit 65 is switched to the audio amplification section 62 side. Then, the system is controlled so that the audio signal is continuously transmitted to the antenna 91.

On the other hand, in a system in which the information signal is added immediately after the transmission of the audio signal, the system may be controlled so that the information signal is transmitted in the above-described code signal transmission procedure immediately after the press button 63 is released.

FIG. 4 shows the operation according to the embodiment of the present invention in detail in a time chart in the case of the two-frequency half-duplex system. FIG. 5 shows the operation according to the embodiment of the present invention in the case of a single frequency simplex system.
This is shown in more detail in a time chart.

In FIG. 4, FB is a base station, M1 to M3
Indicates a plurality of mobile stations, Tx indicates a transmission signal of each wireless device, Rx indicates a reception signal of each wireless device, and th indicates a time when each mobile station has reached an arbitrary calling condition.

Ts is a time axis for specifying the time th at which the mobile station has reached an arbitrary calling condition for the description of the present embodiment. At the time T1, the mobile station M1 sends an arbitrary call signal A requiring a response, and the base station FB returns a response confirmation signal a. At times T2 and T3, the mobile station M3 sends an arbitrary call signal B requiring a response, and the mobile station M1 needs a response while the response confirmation signal b is being returned from the base station FB. The figure shows a case where a call signal C is transmitted. At times T4 and T5, the operation in the case where the arbitrary calling signals D and E requiring a response from the mobile stations M3 and M2 are transmitted at the same calling timing is illustrated.

The base line of Tx and Rx indicates the time zone in the transmission or reception state by a bold line. Also, tp
f indicates a timing signal of the system time generated by the timing pulse generator 41 of the base station FB. The time interval at which the timing signal tpf is generated is a time (dtf + dtm + δ) obtained by adding a margin time δ to the sum of the time width dtm of the call timing signal transmitted from the base station FB and the time width dtm of the call signal from the mobile station. ). Also, tpm
Is a mobile station-side timing pulse generated in synchronization with a call timing signal from the base station FB.

Referring to FIG. 4, the transmission / reception process of the two-frequency half-duplex system according to the arbitrary calling system of the present invention will be described. In the base station FB, the signal generated by the call timing signal generator 43 and the signals from the response signal generator 32, the command signal generator 33, and the like are combined by the transmission signal generator 34, and each signal is generated as a call timing signal tf. Transmit to mobile station.

When it is not necessary to transmit a response confirmation signal, a command signal, and the like from the base station FB, the transmission signal generator 34 generates only a call timing signal and transmits the signal. The timing pulse generator 81 of each of the mobile stations M1 to M3 outputs a timing pulse tp rising at the trailing edge of the call timing signal.
generate m. When the mobile station M1 is in an arbitrary call condition with a response request at time T1, the call condition detection unit 82 of the mobile station M1 waits for the time of the next timing pulse tpm to generate a call time. The unit 83 is started.

The calling time generator 83 generates a signal having a calling signal time width dtm of the mobile station, and sends out the arbitrary calling signal A generated by the transmission signal generator 75. The base station FB receives the arbitrary call signal A, and when the code decoding unit 31 determines that a response signal is necessary, the response code generation unit 32 generates a response code, and the response code is sent to the next call timing signal. a is synthesized and transmitted.

Each mobile station receives the call timing signal tf including the response code a. However, except for the mobile station M1, the recall control unit 68 confirms that there is no relationship with the own station and ignores it. However, the re-call control unit 68 of the mobile station M1 decodes the response code to the own station and executes necessary processing. Similarly, when the mobile station M3 reaches an arbitrary call condition at time T2, the mobile station M3 issues an arbitrary call signal B. Response code b from base station FB
Is transmitted.

At the time T3, even when the mobile station M1 is in an arbitrary calling condition, the arbitrary calling signal C is output from the timing pulse t immediately after receiving the calling timing signal including the response code b.
It is sent out by the calling time generation unit 83 activated by pm.
Response code c from base station FB corresponding to arbitrary call signal C
Is included in the next call timing signal and sent back.

Times T4 and T5 show the case where a plurality of mobile stations M3 and M2 are in an arbitrary calling condition within the same system time. In this case, the arbitrary call signal D of the mobile station M3 and the arbitrary call signal E of the mobile station M2 are called at the same system time, so that the base station FB cannot decode the signal due to interference, and Does not include a response signal. In the mobile stations M3 and M2, since there is no response code addressed to the own station, the recall control unit 68 starts recall control.
The re-call control unit 68 uses the random numbers to generate appropriate delay times tr3 and t3.
r2 is set, and after each delay time elapses, a call request is issued to the call condition detecting unit 82, and the arbitrary call signals D 'and E' are re-issued through the above-described arbitrary call procedure. The arbitrary call signals D 'and E' have contents updated to the latest data when the call state changes during the delay. When one of the collision signals at the base station FB, for example, the call signal E can be decoded, the call timing signal includes the response code e for the mobile station M2, so that only the mobile station M3 The recall operation described above is performed.

With reference to FIG. 5, a description will be given of the process of transmission and reception in the single frequency simplex system according to the arbitrary calling system of the present invention. The codes for the arbitrary call signals A, B, D, and E are processed in the same process as in FIG. 4 except that the transmitter and the receiver of the base station FB are alternately switched. At time T3 when the mobile station M1 is in an arbitrary calling condition, the base station FB is transmitting the response code b. In this case, in the conventional arbitrary calling method, the mobile station makes a call again as shown in FIG. On the other hand, in the present invention, since the actual call of the arbitrary call signal C is at the system time by the next timing pulse tpm, it does not overlap with the arbitrary call signal B from the mobile station M3, and it Disappears.

[0055]

As is apparent from the above description, according to the present invention, in the base station, signals transmitted from a plurality of mobile stations at random are transmitted from the base station at the same time interval. By controlling the call time so that the call is made in accordance with the system time operated by the call timing signal, it is possible to avoid random collision of the signals. As a result, the number of unnecessary recalls can be reduced, and the number of mobile stations accommodated in the system can be increased.

The call timing signal transmitted from the base station includes a response code for acknowledgment, an individual call signal,
By superimposing command signals such as a district polling signal and an arbitrary call stop / cancel signal, it is possible to avoid collision with the arbitrary call signal of the mobile station and improve the communication efficiency of the system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a base station radio apparatus according to an embodiment of the present invention in a case of a two-frequency half-duplex system.

FIG. 2 is a block diagram showing a configuration of a base station radio apparatus according to an embodiment of the present invention in the case of a single frequency simplex system.

FIG. 3 is a block diagram showing a configuration of a mobile station radio apparatus according to an embodiment of the present invention.

FIG. 4 is a time chart showing a communication operation between a base station radio apparatus and a mobile station radio apparatus according to the AVM system of the present invention in the case of a two-frequency half-duplex system.

FIG. 5 is a time chart showing a communication operation between a base station radio apparatus and a mobile station radio apparatus according to the AVM system of the present invention in the case of a single frequency simplex system.

FIG. 6 is a time chart showing a communication operation between a base station radio apparatus and a mobile station radio apparatus according to a conventional AVM system in a case of a two-frequency half-duplex system.

FIG. 7 is a block diagram showing a configuration of a conventional base station radio apparatus in a case of a two-frequency half-duplex system.

FIG. 8 is a block diagram showing a configuration of a conventional mobile station radio apparatus.

FIG. 9 is a time chart showing a communication operation between a base station radio apparatus and a mobile station radio apparatus according to a conventional AVM system in the case of a single frequency simplex system.

FIG. 10 is a block diagram showing a configuration of a conventional base station radio apparatus in the case of a single frequency simplex system.

[Explanation of symbols]

 FB Base station radio apparatus M1 to M3 Mobile station radio apparatus A, B, C, D, E, D ', E' Arbitrary call signal a, b, c, d ', e' Response code tpf Timing signal tf Call Timing signal tpm Timing pulse

Claims (4)

[Claims] 1. A base station radio apparatus to which an AVM system based on a two-frequency half-duplex system or a one-frequency simplex system is applied to perform communication with a plurality of mobile station radio systems in an arbitrary calling format. Timing processing means for continuously transmitting a call timing signal for defining the call timing of each mobile station radio device to the plurality of mobile station radio devices at a constant time interval; and Transmission processing means for combining and transmitting a response code to the mobile station radio apparatus corresponding to the call timing signal when the arbitrary call signal is a signal requesting an acknowledgment. Base station radio apparatus. 2. The base station radio apparatus according to claim 1, wherein said transmission processing means includes:
An optional call stop / release control signal in addition to the response code;
A base station radio apparatus which combines and transmits an individual call signal and a district polling signal. 3. A mobile station radio apparatus to which a two-frequency half-duplex system or a single-frequency simplex AVM system is applied to perform communication with the base station radio apparatus according to claim 1 in an arbitrary calling format. And a means for receiving the call timing signal from the base station radio apparatus and generating a timing pulse synchronized with the received call timing signal. A mobile station radio apparatus for transmitting a call signal. 4. A mobile radio system comprising the base station radio device according to claim 1 and a plurality of mobile station radio devices according to claim 3.