JP2000295166A - Base station radio equipment and mobile station radio equipment, to which avm system is applied - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide base station radio equipment whose efficiency is improved by reducing the chance of the collision of calling signals between plural mobile station radio equipment by transmitting start-stop synchronizing signals at every constant times of a call time interval and transmitting code signal transmission time in synchronizing with the call time interval. SOLUTION: A reference timing pulse generation part 41 generates a timing pulse with a calling time interval obtained by adding allowance time to the time width of a code signal that a system uses for transmission as a unit and sends it to a call reference time generation part 42. The call reference time generation part 42 counts the timing pulse and sends the signal to a start-stop synchronizing signal generation part 43 at every cycle of a counter. The start-stop synchronizing signal generation part 43 generates a start-stop synchronizing signal with the sent signal and sends it to a transmission signal generation part 34. A transmission time generation part 45 generates the control signal of the time width of the code signal in synchronizing with the output of the call reference time generation part 42 with the signal from a call condition detection part 44 and controls the transmission signal generation part 34 and a transmission control part 20.

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 base station radio apparatus and a mobile station radio apparatus to which an itoring method is applied.

[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 AVM system, any mobile station can make an arbitrary call even while an arbitrary call signal is being transmitted from one mobile station. In this case, the content of both signals may interfere with each other to make it impossible to decode at the base station. In order to cope with this, the base station transmits an acknowledgment signal upon receiving the arbitrary call signal, and the mobile station, which has not obtained the acknowledgment signal, recalls the arbitrary call signal after an appropriate time has elapsed. An improved system is also in operation. But,
Gyroscope and GPS (Global Position)
With the advance of the technology of automatic vehicle position detection using the ionizing system, a more accurate vehicle position situation can be instantaneously obtained, and the frequency of arbitrary calls from each mobile station is rapidly increasing. Further, even in a system having a large number of operating mobile stations, the total number of arbitrary calls from each mobile station is large.

FIGS. 6 and 7 show the configuration of a base station radio apparatus (hereinafter abbreviated as a base station) of a two-frequency half-duplex system and a one-frequency simplex system, respectively, as an example of a conventional arbitrary calling system. FIG. FIG. 8 is a diagram showing a configuration of a mobile station radio apparatus (hereinafter abbreviated as a mobile station) corresponding to the base station. FIG. 9 is a diagram for explaining the exchange of signals between the base station and the mobile station in the case of the two-frequency half-duplex system, and FIG. It is a figure for explaining exchange of the signal between stations.

In FIG. 6, since the receiving system 1 and the transmitting system 2 are operated by the two-frequency half-duplex system having different frequencies, the base station is in a code transmission period, in a standby state, and in a call with a certain mobile station. In any of the above conditions, it is possible to receive, decode, and process information encoded by an arbitrary call from a mobile station.

The code processing system 3 encodes acknowledgment information to the mobile station based on the decoded information from the mobile station, checks the current dynamics and position of the mobile station, issues a dispatch instruction,
It generates and stores codes required by the system, such as command signals for arbitrary call stop / release control. The timing processing system 4 generates a clock pulse.

The receiving system 1 includes an antenna 11 and a receiver 1
2. An identification unit 13 for identifying whether the input signal from the mobile station received by the receiver 12 is a voice signal or a code information signal is provided. The output of the receiver 12 is connected to an audio amplifier 15 and sounds a speaker 16 by a switching circuit 14 controlled by an identification unit 13, and the coded information is connected to a decoding unit 17 and decoded. It is sent to the code decoding section 31 of the code processing system 3.

[0008] The transmission system 2 is provided with a transmission control unit 20. When the transmission control unit 20 is notified by the call detection unit 24 that the microphone button 23 has been pressed, the transmission control unit 20
7 is switched to the audio amplifier 22 side, and the audio signal output from the microphone 21 and the audio amplifier 22 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 inputs the code information to the transmitter 28. The signal input to the transmitter 28 is transmitted 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 section 31, and if acknowledgment information to the mobile station is required, the acknowledgment signal is generated by the response signal generation section 32. It is generated and sent to the transmission signal generation unit 34.
A command signal generated by the operation button group 25 and the operation detection unit 26 for the purpose of dispatching a call, stopping / releasing a call, and collecting various information is generated by a command signal generation unit 33 and transmitted to a transmission signal generation unit 34. Send out.

[0010] In FIG. 7, in the base station of the single frequency simplex system, the antenna 01 is switched for transmission and reception by the transmission / reception switching circuit 02 controlled by the transmission control unit 20, but the above-described dual frequency transmission is used. It has the same configuration as the half duplex system. The operation can be realized in the same manner as in the case of the two-frequency half-duplex system as described later.

In FIG. 8, in a mobile station, a receiving system 5 and a transmitting system 6 are connected to a single antenna 91 via a transmission / reception switching circuit 92, and a two-frequency half-duplex is performed with a base station. It is operated by the system or single frequency simplex system.

The code processing system 7 decodes the acknowledgment signal and command signal from the base station to the mobile station based on the decoded information from the base station, and decodes the response information when a response is requested from the base station. In addition to the coding, it performs registration request signals such as the dynamics of the mobile station, changes in location, standby, and breaks.

The timing processing system 8 includes a clock pulse generator 81 used for time measurement, a recall controller 89-1 for making a recall, and a delay time generator 89-2 for setting a delay time for a recall. have.

The antenna 91 of the mobile station is normally connected to the receiver 51 via the transmission / reception switching circuit 92 and operates as a reception antenna. During transmission, the antenna 91 is switched to the output side of the transmitter 66 by the transmission / reception switching circuit 92 driven by the transmission control unit 60, and operates as a transmission antenna.

In the receiving system 5, the signal from the base station received by the receiver 51 via the antenna 91 and the transmission / reception switching circuit 92 is transmitted to the switching circuit 53 controlled by the identification unit 52.
Thus, the audio signal is connected to the audio amplifier 54 and sounds the speaker 55, and the code information is connected to the decoder 56, decoded and sent to the code decoder 71 of the code processor 7.

The transmission system 6 is provided with a transmission control unit 60. When the press button 63 is pressed, the transmission control unit 60 switches the switching circuit 65 to the audio amplification unit 62 side via the transmission control unit 60, and outputs the audio signal output from the microphone 61 and the audio amplification unit 62 to the transmitter 66. input. Response, okay,
The output of the operation button group 64 and the press button 63 for notifying the base station of the information such as the waiting place of the own vehicle, the destination, the break, and the like is sent to the registration request signal generating unit 74.

The code processing system 7 includes a code decoding unit 71, a response signal generation unit 72 when a response to the base station is required, and an optional call signal generation unit 73 for automatically notifying changes in the position, dynamics, etc. of the vehicle. Registration request signal generating section 74 for generating various types of information that the crew reports to the base station, such as standby, call request, break, etc.
And a transmission signal generation unit 75 for encoding and transmitting these signals.

The code decoding section 71 decodes the signal decoded by the decoding section 56. In the contents decoded by the code decoding unit 71,
When a response request signal from the base station is included, a necessary response signal is generated by the response signal generator 72 and sent to the transmission signal generator 75. The optional call signal generation unit 73 automatically activates when the state of the mobile station vehicle changes, such as when the vehicle has passed a certain period of time, moved a distance, passed through a specific position, picked up a passenger, boarded, operated a toll meter, etc. Specifically, an arbitrary outgoing call signal including these pieces of information is generated and sent to the transmission signal generating unit 75.

In FIGS. 9 and 10, FB is a base station, M
1 to M4 are a plurality of mobile stations, Tx is a transmission signal of each station, Rx
Is a received signal of each station, and Th is a time axis that specifies the time when the mobile station has become a condition for arbitrary call.

At time T1, the mobile station M1 sends an arbitrary call signal A requiring a response, and the base station FB returns an acknowledgment signal a. From time T2 to T8
Indicates the time at which the mobile stations M1 to M4 are ready to make an arbitrary call in various time relationships. The base line of Tx and Rx indicates the time zone in the transmission or reception state by a thick line.

Referring to FIGS. 6, 8 and 9, a description will be given of a conventional two-frequency half-duplex transmission / reception process using an arbitrary call format. 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 and sent to the identification unit 13 shown in FIG. When the identification unit 13 identifies that the arbitrary call signal A is code information, the switching circuit 14 is switched to the decoding unit 17 side, and the arbitrary call signal A is sent to the decoding unit 17 and the code decoding unit 31, When a response is required, an acknowledgment signal a is generated by the response signal generation unit 32, and the transmission signal generation unit 34, the switching circuit 27, the transmitter 2
8, transmitted through the antenna 29.

On the other hand, the mobile station M that has transmitted the arbitrary call signal A
In step 1, the recall control unit 89-1 shown in FIG. 8 enters a recall waiting state, and starts measuring the waiting time. The acknowledgment signal a from the base station FB is received by all the mobile stations M1 to M4,
In each mobile station, the antenna 91 and the transmission / reception switching circuit 9 shown in FIG.
2. Reach the identification unit 52 via the receiver 51, and are identified as code information. As a result, the identification unit 52 switches the switching circuit 5
3 is switched to the decoding unit 56 side, and the acknowledgment signal a is
6 and sent to the decoding unit 71. When the code decoding unit 71 of the mobile station M1 confirms that the response is to the own station, the code decoding unit 71 releases the recalling wait state of the recalling control unit 89-1 and shifts to a series of corresponding processes. On the other hand, the code decoding unit 71 of the other mobile station confirms that it is not related to its own station and ends the processing.

At times T2 and T3, mobile stations M3 and M2
Successively call arbitrary call signals B and C,
The base station FB cannot recognize these mobile stations because the received signals collide, and cannot issue an acknowledgment signal. In such a case, there is also a system in which the base station FB issues a non-decipherable signal X as shown in FIG. Mobile station M
In 3 and M2, when the re-call control unit 89-1 does not receive the acknowledgment signal from the code decoding unit 71 to its own station or receives the non-decipherable signal X within a predetermined time, the delay time generating unit 89- Delay time Tr2 generated by random number in 2
And Tr3, re-call signals B 'and C' are issued.

At time T4, an arbitrary call signal D is called from the mobile station M4, and an acknowledgment signal d is sent from the base station. Recalling signals B 'and C' from mobile stations M3 and M2
Is also processed normally. At times T5, T6, and T7, the mobile stations M2, M1, and M4 successively call arbitrary call signals E, F, and G, and the base station FB returns an undecipherable signal X. M1 and M4 are delay times Tr5, Tr6 and T set by random numbers in the same process as described above.
After elapse of r7, re-call signals E ', F', and G 'are issued.

In FIG. 9, the re-call signal G of the mobile station M4 is shown.
While the base station FB sends an acknowledgment signal g 'to the base station FB, a re-call signal E' of the mobile station M2 is issued.
Is operated in the two-frequency half-duplex system, the re-call signal E 'is normally received, and the acknowledgment signal e' is also normally transmitted.

At time T8, the re-call signal F of the mobile station M1
′, The mobile station M3 issues an arbitrary call signal H, but the re-call signal F ′ from the mobile station M1 in the base station FB is sufficiently stronger than the arbitrary call signal H of the mobile station M3. Shows the case where received at the level. In this case, the base station FB issues an acknowledgment signal f 'for the re-call signal F'. For this reason, the re-calling control unit 89-1 of the mobile station M3 cannot obtain an acknowledgment signal to its own station within a certain time, sends out the re-calling signal H 'after the delay time Tr8, and the base station FB returns the acknowledgment response. A signal h 'is issued to complete a series of communication.

Referring to FIGS. 7, 8 and 10, a description will be given of a conventional one-frequency simplex transmission / reception process using an arbitrary call format. However, in the example of FIG. 10, the unreadable signal X when the base station FB cannot confirm the signal content is not used.
The operation between the mobile station and the base station at times T1 to T4 is shown in FIG.
This is the same as the case of the two-frequency half-duplex system described above.

At times T5, T6, and T7, arbitrary call signals E, F, and G from mobile stations M2, M1, and M4 successively.
Is called, but no acknowledgment signal is sent from the base station FB. Therefore, the mobile stations M2, M1, and M4 set the delay times Tr5, Tr6, Tr
After seven lapses, re-call signals E ', F', and G 'are issued.

The base station FB, which is transmitting the acknowledgment signal g 'for the re-call signal G' of the mobile station M4, is operated in the single frequency simplex configuration shown in FIG. For this reason, since the antenna 01 is switched to the transmitter side by the transmission / reception switching circuit 02, the re-call signal E 'called by the mobile station M2 is not received as a complete code, and an acknowledgment signal for the re-call signal E' is not received. Is not called. As a result, the mobile station M2 calls the re-call signal E "again after the delay time Tr5 ', and the base station returns the response signal e".

At time T8, as in FIG. 9, a case is shown in which the outgoing call signal H of the mobile station M3 is masked by the re-calling signal F 'of the mobile station M1 having a sufficiently strong level.

[0031]

In any of the above examples, as the number of mobile stations increases, the possibility of collision of call signals increases even in a re-call, and the waiting time until connection with the base station is increased. There is a problem that it becomes long. Also,
If the waiting time becomes longer, it is expected that information such as the current dynamics and location of the mobile station will change. as a result,
There are inconveniences in system operation, such as difficulty in real-time information collection.

Accordingly, an object of the present invention is to provide a base station radio apparatus and a mobile station radio apparatus which can reduce the chance of a call signal collision between a plurality of mobile station radio apparatuses and improve the efficiency of information collection. Is to provide.

[0033]

SUMMARY OF THE INVENTION A base station radio apparatus according to the present invention includes a plurality of signals for transmitting a signal indicating operation information such as the position and dynamics of a vehicle and a request signal for resting and registering a waiting place in an arbitrary calling system. A mobile station radio apparatus and a base station radio apparatus which receives, decodes, and obtains the above-mentioned various signals into the system and transmits an acknowledgment signal or a command signal to the request signal, and communicates in an arbitrary calling format. 2 to do
The present invention is applied to a mobile radio system to which an AVM system based on a half frequency duplex system or a single frequency simplex system is applied, and the base station radio apparatus adds a margin time dtf to a transmission time width dtw of a code signal used in the system. The fixed time width dts is set as the unit of the calling time interval of the system, the start-stop synchronization signal is transmitted at every constant multiple of the calling time interval, and the transmission time of the code signal such as the acknowledgment signal or the command signal is transmitted. It is characterized by having timing processing means for transmitting in synchronization with the call time interval.

The timing processing means includes a reference timing pulse generator for generating a timing pulse in units of the calling time interval, and counts the timing pulses and circulates them with an integer set by the system. A call reference time generator for transmitting a signal for each cycle of the counter, and a start synchronization signal for generating the start synchronization signal based on a signal from the call reference time generator A calling condition detecting unit for detecting whether or not the calling condition has been reached, and transmitting a signal when detecting that the calling condition has been reached; and a signal from the calling condition detecting unit. A transmission time generation unit for generating a control signal having a time width of the code signal in synchronization with the counter output of the call reference time generation unit and controlling the transmission signal generation unit and the transmission control unit. .

A mobile station radio apparatus according to the present invention is for communicating with the base station radio apparatus. The mobile station radio apparatus receives the start-stop synchronization signal from the base station radio apparatus and receives the start-stop synchronization signal. The calling time interval of the system synchronized with the reference time is set as the unit of the calling time in the mobile station radio apparatus, and the calling of the arbitrary calling signal when the arbitrary calling condition is satisfied. Wait until the next reference time,
Further, within the range up to the next reference time, by providing timing processing means for distributing an integer multiple of the call time interval to a time set by a random number and making a call, a call signal of the base station radio apparatus, Avoiding a halfway collision of arbitrary call signals between mobile station radio apparatuses, and when the arbitrary call signal requires an acknowledgment, transmitting an acknowledgment signal from the base station radio apparatus to reduce noise and noise. By enabling a recall procedure for a mobile station radio device that could not be confirmed by the base station radio device due to signal collision, more arbitrary outgoing call signals can be obtained more reliably by the system. It is characterized by the following.

The timing processing means includes a clock pulse generator for generating a clock pulse for time measurement, and the start-stop synchronization signal included in a signal received from the base station radio apparatus upon receiving the clock pulse. And a call waiting time counter that counts a waiting time from when a calling condition occurs to the mobile station radio device until the reference time detecting unit detects the start-stop synchronization signal. Based on the detected start-stop synchronization signal, a separation timing generating unit that sets a calling time synchronized with an integer multiple of the calling time interval by using a random number, and a calling time set by the separation timing generating unit. A transmission time generation unit for generating a code signal time width; a call condition detection unit for detecting a call condition of the mobile station radio apparatus and starting transmission control; A retransmission call condition detection unit for performing recall processing when a corresponding acknowledgment signal is not returned from the base station radio device within a predetermined time after the line device issues a response request signal; and A call stop / release control unit for detecting a call stop command or a stop release command from the device and controlling the operation of the call condition detection unit.

The base station radio apparatus is applied to the AVM system based on the single frequency simplex system, and the transmission of the acknowledgment signal is performed by an even number or an odd number in a time zone defined by the calling time interval. In the case of performing in the time zone, in the separation timing generation unit in the mobile station radio device, based on the detected start-stop synchronization signal, odd or even random numbers to an integer multiple of the calling time interval. A synchronous calling time is set.

The mobile station radio apparatus transmits the waiting time counted by the call waiting time counter unit in an arbitrary call signal and transmits the signal, thereby distributing the random number and transmitting the mobile station in random order. The arbitrary call signal from the wireless device can be used as operation management information by determining the order of the time at which the call condition occurred on the base station wireless device side.

[0039]

According to the present invention, the calling time of the code signal transmitted by the base station radio apparatus and the mobile station radio apparatus is determined by a fixed time width obtained by adding a margin time to the transmission time width of the code signal. By setting the unit to the unit and synchronizing the transmission time of the code signal with the calling time interval, the disadvantage that half-way collision occurs between code signals arbitrarily called in the system as in the conventional method. Exclude.

Further, in order to synchronize the calling time interval set by the mobile station radio device with the calling time interval set by the base station radio device, the base station radio device sets a constant multiple of the calling time interval. The mobile station radio apparatus synchronizes the calling time interval with the start synchronization signal as a reference time, and when an arbitrary call condition occurs in the mobile station radio apparatus, the mobile station radio apparatus The wireless device suspends signal transmission until a reference time for receiving the next start-stop synchronization signal, and when the reference time is reached, the calling time is set using a random number within a range until the next reference time. By generating a delay time that is an integral multiple of the interval and issuing an arbitrary call signal, even when a plurality of mobile stations are in a call condition at a close time, by dispersing the timing of the actual call time, To reduce the chance of a call signal collision .

By introducing the start-stop synchronization signal into the system, the waiting time spent on the above-mentioned transmission hold is measured, and the waiting time is superimposed on the call signal and transmitted. Since the mobile station radio apparatus can know the order of the times when the call conditions are actually set to be used for operation management and can use the start-stop synchronization signal as the reference time of each mobile station radio apparatus, the base station radio apparatus can be used. It is possible to provide a mobile station radio apparatus that does not need to be equipped with a high-precision timepiece in order to eliminate a delay in calling time from the apparatus.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a base station radio apparatus (hereinafter, referred to as a base station) and a mobile station radio apparatus (hereinafter, a mobile station) according to the present invention will be described below with reference to the drawings. explain. FIG. 1 shows an embodiment of the present invention.
1 shows a configuration of a base station of a two-frequency half-duplex system.
As shown in FIG. 1, since the receiving system 1 and the transmitting system 2 are operated by a two-frequency half-duplex system having different frequencies, the base station communicates with a certain mobile station during a code transmission period, during standby, and during a code transmission period. In any of the above states, 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 acknowledgment information to the mobile station based on the decoded information from the mobile station, confirms the current dynamics and position of the mobile station, issues a dispatch instruction,
It generates and stores codes required by the system, such as command signals for control of arbitrary call stop / release.

The timing processing system 4 performs generation of a reference timing pulse provided for the present invention, detection of calling conditions, generation of a start-stop synchronization signal for synchronizing the calling time, generation of a code transmission time width, and the like. Is going.

The receiving system 1 includes an antenna 11 and a receiver 1
2. An identification unit 13 for identifying whether the input signal from the mobile station received by the receiver 12 is a voice signal or a code information signal is provided. The output of the receiver 12 is connected to the audio amplification unit 15 and sounds the speaker 16 by the switching circuit 14 controlled by the identification unit 13, and the coded information is connected to the decoding unit 17 and decoded. The code is 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. When the transmission control unit 20 is notified by the call detection unit 24 that the microphone button 23 has been pressed, the transmission control unit 20
7 is switched to the audio amplifier 22 side, and the audio signal output from the microphone 21 and the audio amplifier 22 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 inputs the code information to the transmitter 28. The signal input to the transmitter 28 is
9 to each mobile station.

In the code processing system 3, the code decoding section 31 receives and decodes the code information from the mobile station, and generates an acknowledgment signal in the response signal generating section 32 when acknowledgment information to the mobile station is required. The signal is transmitted to the transmission signal generator 34. In addition, a dispatch call generated by the operation button group 25 and the operation detection unit 26,
The command signal for the purpose of stopping / releasing the call, collecting various information, and the like is generated by the command signal generation unit 33, and the transmission signal generation unit 3
4

The timing processing system 4, which is a main part of the present invention and controls the operation time of the system, includes a reference timing pulse generator 41, a call reference time generator 4,
2. It is composed of an asynchronous signal generator 43, a calling condition detector 44, and a transmission time generator 45.

The reference timing pulse generator 41 generates a timing pulse in units of a call time interval obtained by adding a margin to the time width of the code signal used for transmission by the system, and generates a call reference time generator 42. Send to The calling reference time generation unit 42 is configured by a counter that counts the timing pulse and circulates with an integer value set in the system,
A signal is sent to the start-stop synchronization signal generator 43 every time the counter makes one round. With this signal, the start-stop synchronization signal generator 43 generates an start-stop synchronization signal. The start-stop synchronization signal generated by the start-stop synchronization signal generation unit 43 is sent to the transmission signal generation unit 34 of the code processing system 3 described above. In the calling condition detecting unit 44,
The transmission time generation unit 45 detects whether the output state of the start-stop synchronization signal generation unit 43, the response signal generation unit 32, the command signal generation unit 33, and the like has reached the calling condition. Send a signal. Transmission time generation unit 45
Is a signal from the calling condition detection unit 44, generates a control signal having a time width of the code signal in synchronization with the output of the calling reference time generation unit 42, and controls the transmission signal generation unit 34 and the transmission control unit 20. .

FIG. 2 shows a configuration of a base station of a single frequency simplex system according to the present invention. As shown in FIG. 2, in a single frequency simplex base station, an antenna 01
However, it has a configuration similar to that of the above-described two-frequency half-duplex system except that the transmission and reception switching circuit 02 controlled by the transmission control unit 20 switches between transmission and reception. The operation can be realized in the same manner as in the case of the two-frequency half-duplex system as described later.

FIG. 3 shows the configuration of a mobile station according to the two-frequency half-duplex system or the one-frequency simplex system as an embodiment of the present invention. As shown in FIG. 3, the receiving system 5 and the transmitting system 6 are connected to a single antenna 91 via a transmission / reception switching circuit 92, and communicate with a base station in a two-frequency half-duplex system or a one-frequency system. Operated by simplex method.

The code processing system 7 decodes an acknowledgment signal and a command signal from the base station to the mobile station based on the decoded information from the base station, and decodes the response information when a response is requested from the base station. In addition to the coding, it performs registration request signals such as the dynamics of the mobile station, changes in location, standby, and breaks.

The timing processing system 8 generates a reference time synchronized with the start-stop synchronization signal from the base station, detects an arbitrary call condition, a waiting time counter from the detection of the arbitrary call condition to the reference time, It is a part for controlling the calling time provided for the present invention, such as generation of a separation timing for setting the time from the reference time to the actual calling by a random number, and generation of an actual transmission time width.

The antenna 91 of the mobile station is normally connected to the receiver 51 via the transmission / reception switching circuit 92 and operates as a reception antenna. During transmission, the antenna 91 is switched to the output side of the transmitter 66 by the transmission / reception switching circuit 92 driven by the transmission control unit 60, and operates as a transmission antenna.

In the receiving system 5, a signal from the base station is received by the receiver 51 via the antenna 91 and the transmission / reception switching circuit 92. The received signal is connected to the audio amplifying unit 54 in the case of an audio signal and sounds the speaker 55, and is connected to the decoding unit 56 in the case of code information, by the switching circuit 53 controlled by the identification unit 52. The data is decoded and sent to the code decoding unit 71 of the code processing system 7.

The transmission system 6 is provided with a transmission control unit 60. When the press button 63 is pressed, the transmission control unit 60 switches the switching circuit 65 to the audio amplification unit 62 side via the transmission control unit 60, and outputs the audio signal output from the microphone 61 and the audio amplification unit 62 to the transmitter 66. input. Response, okay,
The output of the operation button group 64 and the press button 63 for notifying the base station of the information such as the waiting place of the own vehicle, the destination, the break, and the like is sent to the registration request signal generating unit 74.

The code processing system 7 includes a code decoding section 71, a response signal generation section 72 when a response to the base station is required, and an optional call signal generation section 73 for automatically notifying changes in the position, dynamics, etc. of the vehicle. Registration request signal generating section 74 for generating various types of information that the crew reports to the base station, such as standby, call request, break, etc.
And a transmission signal generation unit 75 for encoding and transmitting these signals.

The code decoding section 71 decodes the signal decoded by the decoding section 56, and controls a start / stop signal for controlling the time at which the mobile station arbitrarily calls, an acknowledgment signal from the base station, a call stop / release. And sends it to the timing processing system 8. If the content decoded by the code decoding unit 71 includes a response request signal from the base station, a necessary response signal is generated by the response signal generation unit 72 and sent to the transmission signal generation unit 75. The optional call signal generation unit 73 automatically activates when the state of the mobile station vehicle changes, such as when the vehicle has passed a certain period of time, moved a distance, passed through a specific position, picked up a passenger, boarded, operated a toll meter, etc. Specifically, an arbitrary outgoing call signal including these pieces of information is generated and sent to the transmission signal generating unit 75.

The timing processing system 8 controls the calling time of the mobile station and is a main part of the present invention. The timing processing system 8 includes a clock pulse generator 8 used for time measurement.
1. A reference time detecting unit 82 for detecting a start-stop synchronization signal from a base station, and a call for counting a waiting time from when a calling condition occurs in the mobile station until the reference time detection unit 82 detects a start-stop synchronization signal. A waiting time counter unit 83 is provided. The timing processing system 8 also references the start-stop synchronization signal from the base station,
Separation timing generator 84 for setting a call time synchronized with an integer multiple of the call time interval by using a random number, and a transmission time generator for generating a code signal time width at the call time set by separation timing generator 84 85, a calling condition detecting unit 86 for detecting a calling condition of the mobile station and starting transmission control, a re-calling condition detecting unit 87 for detecting a re-calling condition, and temporary stop / arbitrary call transmission / reception by a command signal from the base station. A call stop / release control unit 88 for controlling release is provided.

The clock pulse generator 81 generates a clock pulse used for time measurement by the call waiting time counter 83 and the separation timing generator 84. The reference time detecting section 82 detects the start-stop synchronization signal from the base station and sends a signal to the call waiting time counter section 83 and the separation timing generating section 84. The call waiting time counter unit 83 starts measurement at the time when the call condition detection unit 86 detects the call condition, and measures the time until the reference time detection unit 82 receives the next start-stop synchronization signal. The value is sent to the transmission signal generation unit 75 and is used as a part of the call information to the base station.

Upon receiving the signal from the calling condition detection unit 86, the separation timing generation unit 84 receives the signal from the call condition detection unit 86, and in a two-frequency half-duplex system, generates a start-stop synchronization signal for the base station. An integer random number is generated, and a trigger signal is sent to the transmission time generation unit 85 after a delay time that is an integral multiple of the calling time interval based on the signal from the reference time detection unit 82. On the other hand, in the case of the one-frequency simplex method described later, the separation timing generator 84 generates, for example, an odd random number within the range of the number of circulations of the circulation counter, and outputs the reference time detector 82
A trigger signal is transmitted to the transmission time generation unit 85 after a delay time that is an odd multiple of the calling time interval based on the signal from the transmission time generation unit 85.

The transmission time generation section 85 sends a pulse of the code signal time width set by the system to the transmission control section 60 of the transmission system 6 and the transmission signal generation section 75 of the code processing system 7 in response to the trigger signal. Is sent. The re-calling condition detecting unit 87 is a detecting unit for performing a re-calling process when a corresponding acknowledgment signal is not returned from the base station within a predetermined time after the own station issues a response request signal.

The call stop / release control unit 88 detects a call stop command or a stop release command from the base station, and controls the operation of the call condition detection unit 86. The calling condition detection unit 86
The calling condition is determined based on signals from the response signal generating unit 72, the optional calling signal generating unit 73, the registration request signal generating unit 74, the recalling condition detecting unit 87, and the calling stop / release control unit 88, and The call waiting time counter 83 and the separation timing generator 84 are notified.

The crew of the mobile station presses the press button 63
In a system in which an information signal including a microphone press code is automatically added immediately before the audio signal when the audio signal is transmitted from the microphone 61 using the After the transmission is completed in the code transmission procedure, the switching circuit 65 is switched to the audio amplifier 62 side, and 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 an information signal is added immediately after transmitting an audio signal, the system may be controlled so that the information signal is transmitted in the code transmission procedure immediately after the press button 63 is released.

The operation in the case of the two-frequency half-duplex system will be described with reference to FIGS. In FIG.
FB is a base station, M1 to M4 are a plurality of mobile stations, Tx is a transmission signal of each station, Rx is a reception signal of each station, Tb is a base station FB
Time axis for explaining the function of the timing pulse
h is a time axis that specifies the time when each mobile station has reached an arbitrary calling condition. The base line of Tx and Rx indicates the time zone in the transmission or reception state by a thick line. T1 to T8
9 shows the time when the mobile stations M1 to M4 are in the calling condition with the same time relationship so as to be compared with the description of the conventional system shown in FIG.

The reference timing pulse generator 41 of the base station FB uses a fixed calling time interval dts obtained by adding a margin time dtf to a time width dtw of an encoded signal used for transmission by the system. Generate a reference timing pulse. Therefore, here, the calling time interval dt
s is defined by the time from the rise of a certain code signal to the rise of the next code signal. Calling reference time generator 4
Numeral 2 denotes an N-ary (N is an integer) cyclic counter for counting the reference timing pulse, which sends a pulse to the transmission time generating section 45 every time the counter is counted, and an asynchronizing signal generating section for every cycle of the cyclic counter. A pulse is sent to 43.

The Tb time axis in FIG. 4 shows the counting state of a decimal counter configured to make one cycle, for example, ten times. The start-stop synchronization signal generator 43 receives a pulse sent from the call reference time generator 42 for each cycle of the circulation counter, generates an start-stop synchronization signal s, sends it to the transmission signal generator 34, and a call condition detector. 44 is also notified. The notified calling condition detecting unit 44 sends a detection signal to the transmission time generation unit 45, and the transmission time generation unit 45 outputs a pulse output from the circulation counter of the calling reference time generation unit 42 with the duration dtw of the code signal. To generate a control signal synchronized with.

The transmission control unit 20 receives the control signal at a time interval Ts in which the circulation counter of the call reference time generation unit 42 makes a round, as indicated by the Tb time axis in FIG. Switching to the unit 34 side, the transmitter 28 is driven, and the start-stop synchronization signal s received by the transmission signal generation unit 34 is transmitted from the antenna 29.

When the base station FB uses the single frequency simplex system shown in FIG. 2, the transmission control unit 20 drives the transmitter 28 and simultaneously switches the transmission / reception switching circuit 02 to the transmitter 28 side. The start synchronization signal s is transmitted from the antenna 01 in the same procedure as described above.

At time T1 in FIG. 4, a series of operation steps is shown in which the mobile station M1 sends an arbitrary call signal A requiring a response, and the base station FB returns an acknowledgment signal a. At time T1, when the calling condition detecting unit 86 of the mobile station M1 detects an arbitrary calling condition, it sends a detection signal to the calling waiting time counter unit 83 and the separation timing generating unit 84. The call waiting time counter 83 starts measuring the waiting time by using the clock pulse from the clock pulse generator 81 based on the detection signal, and the reference time detector 82 detects the start-stop synchronization signal s from the base station FB. The time Tw1 until the time is calculated.

On the other hand, when the separation timing generator 84 receives the detection signal from the call condition detector 86, the separation timing generator 84 receives the detection signal from the base station FB.
Generates a random number having an integer value of, for example, 1 to (N−2) within the range of the N-ary counter of the call reference time generation unit 42 provided in. In the example of FIG. 4, since it is a decimal counter, a random number 4 having an integer value within the range of 1 to 8 is generated. Subsequently, after receiving the signal from the reference time detection unit 82 after the call waiting time Tw1, the separation timing generation unit 84 generates a delay time Tr1 that is a random number times the call time interval dts. In the example of FIG.
1 is dts × 4, and sends a signal to the transmission time generation unit 85 after the delay time of Tr1 has elapsed. Transmission time generator 85
Generates a control signal having a code signal time width dtw and outputs the control signal to the transmission signal generation unit 75 and the transmission control unit 60. The transmission control unit 60 switches the switching circuit 65 to the transmission signal generation unit 75 side and drives the transmitter 66, and simultaneously switches the transmission / reception switching circuit 92 to the transmitter 66 side to switch the transmission signal generation unit 75.
Is transmitted from the antenna 91.

The transmission signal generation unit 75 includes the waiting time Tw1 from the call waiting time counter unit 83 as information, so that the base station FB can know the time T1 when the mobile station M1 is in the calling condition. Since it is possible, as described later, it becomes possible to order the times at which the mobile station has actually made the calling condition.

At times T2 and T3, mobile station M3
And M2 in succession when the conditions for calling arbitrary calling signals B and C requiring a response are described. Through the same process as described above, the mobile station M3 sets the separation timing generator 8 after the call waiting time Tw2.
In step 4, a random number 8 is generated, and a calling signal B is transmitted after a delay time Tr2 that is eight times the calling time interval dts. On the other hand, mobile station M
In 2, the call signal C is transmitted after a delay time Tr3 that is one time of the call time interval dts by the random number 1 generated by the separation timing generator 84 after the call waiting time Tw3.

The base station FB transmits acknowledgment signals b and c to the call signals B and C in the same process as the transmission of the acknowledgment signal a to the call signal A. At time T4, when the condition for the mobile station M4 to call the arbitrary call signal D is reached, the arbitrary call signal D is transmitted after the separation timing time Tr4 following the call waiting time Tw4 in the same manner as described above. , The base station FB transmits an acknowledgment signal d.

At times T5, T6, and T7, mobile station M2,
M1 and M4 become conditions for successively calling outgoing call signals E, F, and G. After the above-described processes, (T
w5 + Tr5), (Tw6 + Tr6), (Tw7 + Tr5)
7) Send arbitrary call signals E, F and G later.

At this time, as shown in FIG. 4, if the random numbers generated by the separation timing generators 84 of the mobile stations M1 and M4 become the same, Tr6 and Tr7 have the same calling timing, and the base station has the same calling timing. The station FB cannot decode the signal and cannot transmit the acknowledgment signal. Mobile stations M1 and M4
After receiving the code-sent signal from the transmission signal generation unit 75, the recall detection unit 87 cannot receive an acknowledgment signal addressed to its own station from the code decoding unit 71 in the next calling time zone. It is determined that a recall is necessary, and a signal is sent to the calling condition detection unit 86.

The mobile stations M1 and M4 are provided with a calling condition detecting unit 8
In response to the detection signal from No. 6, the calling operation is started, and re-call signals F 'and G' are issued. At time T8, mobile station M
3 becomes the calling condition, and the arbitrary calling signal H
Send

The example of FIG. 4 shows a case where the signal H is at the same time as the re-call signal F 'of the mobile station M1, but the signal F' at the base station FB is sufficiently stronger than the signal H.
In the base station FB, as shown in FIG.
And the acknowledgment signal from the base station FB to the mobile station M3 is not transmitted. In this case, the mobile station M
The re-call detection unit 87 of FIG. 3 converts the acknowledgment signal received and decoded by the own station after transmitting the arbitrary call signal H into a signal f 'for another station.
Therefore, the re-calling signal detecting section 87 starts the re-calling operation, transmits the re-calling signal H 'in the above-described procedure, and the base station FB transmits the acknowledgment signal h' to complete a series of communication.

FIG. 5 shows the case of the single frequency simplex system.
The mobile station M1 has the same temporal relationship as the times T1 to T8 in FIG.
... M4 show the operation status when the optional call condition is set. In the case of the single frequency simplex system, while the base station FB is transmitting the acknowledgment signal, it cannot receive the call signal from the mobile station,
There is a possibility that the conditions for re-calling may be slightly increased as compared with the case of the two-frequency half-duplex system shown in FIG.

In the example of FIG. 5, the random number generated by the separation timing generator 84 of the mobile station is set to be, for example, an odd number (or an even number). In this case, the acknowledgment signal from the base station FB must be an even number. The above-mentioned inconvenience is solved by configuring so as to be in the (or odd) time zone.

At time T1, the mobile station M1 receives the arbitrary call signal A
Is transmitted, and the base station FB transmits an acknowledgment signal a. In this case, the random number generated by the separation timing generator 84 of the mobile station M1 is not 4, as shown in FIG. Therefore,
The delay time Tr1 generated by the separation timing generator 84 is dts × 3.

Even when the mobile stations M3 and M2 are in an arbitrary calling condition at times T2 and T3, the mobile stations M3 and M2 transmit the arbitrary calling signals B and C in the same process as described above. However, the delay time Tr2 generated by the separation timing generator 84 of the mobile station M3 becomes dts × 7 due to the odd number 7 selected by the random number.

At time T4, the mobile station M4 enters the optional calling condition, and issues an optional calling signal D after (Tw4 + Tr4). In the case of the timing shown in FIG. 4, the acknowledgment signal a for the mobile station M1 is the same as the calling timing time Tr4 of the mobile station M4, that is, dts × 5. However, in FIG. 5, as described above, the acknowledgment signal from the base station FB is always set to an even time period,
Since the random number for generating the calling time of the mobile station M1 is limited to an odd number, no collision occurs between the calling time of the base station FB and the calling time of the mobile station M4, and the collision between the mobile stations M1 and M4. Recalls are avoided.

When the arbitrary calling signals F and G of the mobile stations M1 and M4, which have reached the arbitrary calling condition at times T6 and T7, collide, the mobile stations M1 and M4 receive the re-calling signal F in the same manner as described above. 'And G'. Mobile station M3 at time T8
Is an arbitrary call condition, and the arbitrary call signal H of the mobile station M3 is masked by the re-call signal F 'of the mobile station M1, the mobile station M3 transmits the re-call signal H' in the same process as described above. I do.

[0085]

As is apparent from the above description, according to the present invention, the calling time of a calling signal arbitrarily generated in a plurality of mobile stations can be set at a fixed time interval from a reference time set in the system. By controlling the call so as to be in time with the call time interval as a unit and dispersing the call by using a random number, it is possible to reduce the chance that the call signals collide with each other and reduce the number of unnecessary recalls. Therefore, the number of mobile stations accommodated in the system can be increased.

Also, a response signal for acknowledgment from the base station,
Since various command signals are also transmitted in synchronization with the time in units of the calling time interval, a halfway collision between the base station and the mobile station can be avoided, and the communication efficiency of the system can be improved. .

Further, by transmitting the start-stop synchronization signal from the base station at fixed time intervals, a synchronization signal is continuously transmitted from the base station in order to synchronize the calling time between the mobile station and the base station. There is no need to install a high-precision clock oscillator on the side, and the cost of the entire system can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of a base station radio apparatus according to the present invention in the 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 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 the present invention applied to the base station radio apparatus of FIG. 1 or 2;

FIG. 4 is a time chart for explaining operations of the base station radio apparatus of FIG. 1 and the mobile station radio apparatus of FIG. 3;

5 is a time chart for explaining operations of the base station radio apparatus of FIG. 2 and the mobile station radio apparatus of FIG. 3;

FIG. 6 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. 7 is a block diagram showing a configuration of a conventional base station radio apparatus in the case of a single frequency simplex system.

FIG. 8 is a block diagram showing a configuration of a conventional mobile station radio apparatus applied to the base station radio apparatus of FIG. 6 or 7;

9 is a time chart for explaining the operation of the base station radio apparatus of FIG. 6 and the mobile station radio apparatus of FIG. 8;

FIG. 10 is a time chart for explaining the operation of the base station radio apparatus of FIG. 7 and the mobile station radio apparatus of FIG. 8;

[Explanation of symbols]

 01, 11, 29, 91 Antenna 02, 92 Transmission / reception switching circuit 12, 51 Receiver 13, 52 Identification unit 14, 27, 53, 65 Switching circuit 15, 22, 54, 62 Audio amplification unit 16, 55 Speaker 17, 56 Decoding unit 20, 60 Transmission control unit 21, 61 Microphone 23 Microphone button 24 Call detection unit 25, 64 Operation button group 26 Operation detection unit 28, 66 Transmitter 31, 71 Code decoding unit 32, 72 Response signal generation unit 33 Command signal Generation units 34, 75 Transmission signal generation unit, 41 Reference timing pulse generation unit 42 Call reference time generation unit 43 Start-up synchronization signal generation unit 44 Calling condition detection unit 45 Transmission time generation unit 63 Press button 73 Arbitrary call signal generation unit 74 Registration request signal generator 81 Clock pulse generator 82 Reference time detector 83 Call waiting time counter 84 Separation timing generator 85 Transmission time generator 86 Calling condition detector 87 Recalling condition detector

Claims (6)

[Claims] 1. A plurality of mobile station radio apparatuses for transmitting a signal indicating operation information such as a position and a dynamic state of a vehicle, a request signal for a break, a registration of a standby place, and the like by an arbitrary calling method, and receiving the various signals described above. It is composed of a base station wireless device that transmits an acknowledgment signal and a command signal to the request signal in addition to decoding and obtaining the request signal, and a two-frequency half-duplex system or a one-frequency AV by simplex system
In a mobile radio system to which the M system is applied, the base station radio apparatus uses a fixed time width dts obtained by adding a margin time dtf to a transmission time width dtw of a code signal used in the system as a unit of a system call time interval. Timing processing means for setting and transmitting a start-stop synchronization signal at every constant multiple of the calling time interval, and transmitting a code signal transmission time such as an acknowledgment signal or a command signal in synchronization with the calling time interval. A base station radio apparatus comprising: 2. The base station radio apparatus according to claim 1, wherein the timing processing means includes: a reference timing pulse generator for generating a timing pulse in units of the calling time interval; A call reference time generator for transmitting a signal for each cycle of the counter; and a signal from the call reference time generator, wherein the start-up is performed by a signal from the call reference time generator. A start-up synchronization signal generation unit for generating a synchronization signal; a call condition detection unit for detecting whether or not a call condition has been reached, and transmitting a signal when the call condition has been detected; A signal from the call condition detection unit, for generating a control signal having a time width of the code signal in synchronization with the counter output of the calling reference time generation unit and controlling the transmission signal generation unit and the transmission control unit; Base station radio apparatus characterized by comprising a signal time generating unit. 3. A mobile station radio apparatus for performing communication with the base station radio apparatus according to claim 1, wherein said start / stop synchronization signal is received from said base station radio apparatus. The calling time interval of the system synchronized with the reference time is set as the unit of the calling time in the mobile station radio apparatus, and the calling of the arbitrary calling signal when the arbitrary calling condition is satisfied is set. After waiting until the next reference time, within the range up to the next reference time, by providing timing processing means for distributing the call by distributing an integer multiple of the calling time interval to a time set by a random number, If the call signal of the base station radio device or the arbitrary call signal between the mobile station radio devices avoids a halfway collision, and the arbitrary call signal requires an acknowledgment, the acknowledgment response from the base station radio device By transmitting signals, noise and signal By enabling a re-call procedure for a mobile station radio device that could not be confirmed by the base station radio device due to a signal collision, more arbitrary outgoing call signals can be obtained more reliably by the system. A mobile station radio apparatus characterized by the above-mentioned. 4. The mobile station radio apparatus according to claim 3, wherein said timing processing means includes: a clock pulse generator for generating a clock pulse for time measurement; and said base station radio apparatus receiving said clock pulse. A reference time detecting unit for detecting the start-stop synchronization signal included in the signal received from the mobile station radio apparatus, and a wait time from when a call condition is generated in the mobile station radio apparatus until the reference time detection unit detects the start-stop synchronization signal. A call waiting time counter for counting time; a separation timing generator for setting a call time synchronized with an integer multiple of the call time interval with a random number based on the detected start-stop synchronization signal; A transmission time generation unit for generating a code signal time width at the call time set by the timing generation unit; and detecting transmission conditions of the mobile station radio apparatus and starting transmission control. A calling condition detecting unit for performing a re-calling process if the corresponding acknowledgment signal does not return from the base station radio device within a predetermined time after the mobile station radio device issues a response request signal And a call stop / release control unit for detecting a call stop command or a stop release command from the base station wireless device and controlling the operation of the call condition detection unit. A mobile station radio apparatus characterized by the above-mentioned. 5. The mobile station radio apparatus according to claim 4, wherein said base station radio apparatus uses an A-frequency simplex method.
The method is applied to a VM system, wherein the transmission of the acknowledgment signal is performed during an even or odd time period among the time periods defined by the calling time interval. The separation timing generating section sets a calling time synchronized with an integer multiple of the calling time interval by an odd or even random number based on the detected start-stop synchronization signal. apparatus. 6. The mobile station radio apparatus according to claim 4, wherein the mobile station radio apparatus transmits the waiting time counted by the call waiting time counter unit by including the waiting time in an arbitrary call signal. Arbitrary call signals from the mobile station radio apparatus distributed in random order and transmitted in random order can be used as operation management information by judging the order of time at which call conditions occurred on the base station radio apparatus side. A mobile station radio apparatus characterized by the above-mentioned.