JP2722136B2 - Traffic signal control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is widely used for remote control monitoring of traffic signal equipment, for example, TDM-FS.
Using a dedicated line (3.4 kHz band item) at high speed and combining a synchronous multiplexing system and an asynchronous multiplexing system, remote control monitoring of multiple signal controllers and various vehicle detectors on one line And a traffic signal control system capable of exchanging information with various terminal devices.

[0002]

2. Description of the Related Art When a traffic signal device is controlled, a signal which is generated at a constant period, such as information on real-time control of a traffic signal and a signal indicating the presence of a vehicle detector, is a signal whose arrival time is not allowed to vary. Information that is sporadic and has an unspecified amount of information generated at one time, such as a car locator or man locator or an information inquiry terminal, must be input, and the entire area signal device must be controlled based on this information. No. For this reason, various methods of incorporating sporadic information into periodic information have been adopted. In a conventional traffic signal control system, separate lines were configured to transmit and receive such information.

[0003]

Therefore, in the conventional traffic signal control system, it is difficult to perform information processing in real time, and not only the amount of information that can be sporadically processed, but also the amount of information that can be processed is limited. Since separate dedicated lines are required for transmission and reception, the cost is high, and it is difficult to centralize the system on the center side, and there is a problem that an extra space is required.

[0004] The present invention has been made in view of the above problems, and in particular, is a dedicated line (band item 3) of a time division multiplexing system (hereinafter referred to as "TDM-FS system") using a frequency shift modem. .4 kHz) at a high speed and combining a synchronous multiplexing method and an asynchronous multiplexing method (hereinafter referred to as "Multi-TDM method") to enable remote control monitoring of a plurality of signal controllers on one line and various It is an object of the present invention to provide a traffic signal control system which enables information collection of a vehicle sensor and information exchange with various terminal devices and is widely used for remote control monitoring of a traffic signal device or the like.

[0005]

A traffic signal control system according to the present invention comprises a plurality of centralized control signal controllers installed at an intersection or the like, a terminal device such as a variable information board or a monitor television, and a central additional device. And communication by means of a communication medium, and information transmission to a moving object such as a car locator or a man locator, and input of information in which the amount of information sporadically and simultaneously generated from these moving objects is unspecified, In a data communication in which various location systems for grasping the moving object are communicated by a communication medium in order to control the entire local signal device based on the information of the central signal, a central additional device using a telephone line between the transmitting and receiving devices of the communication medium And a terminal add-on device, and multiplexing between the two devices is performed on the time axis. Performs assignment of Tasurotto to speed time division multiplexed line, information of the real time control of multiple traffic lights
Information that is generated in a fixed cycle, such as the presence signal of
If there is no variation in the arrival time
In addition, synchronous multiplexing with fixed time slots
And the car locator or man locator or information
Occurs sporadically, such as at a terminal for information inquiry, and occurs once
For information with unspecified information amount, it depends on the packet format.
The purpose of the asynchronous multiplexing system is to enable remote control monitoring of a plurality of signal controllers, information collection of various vehicle detectors, and information exchange with various terminal devices through one dedicated line. In addition, 2 between the central additional device and the terminal additional device.
It is also possible to add a line type full-duplex modem or to configure the terminal section network wirelessly.

[0006]

According to the configuration of the present invention, in the relay of a wired or wireless communication medium, a synchronous time division multiplexing method and an asynchronous time division multiplexing method of a time division multiplexing method for performing multiplexing between a central additional device and a terminal additional device on a time axis. Multiplexing method alternately assigns consecutive data slots and provides information on real-time control of multiple traffic signals.
Information that is generated at regular intervals, such as the presence signal of
The arrival time is not allowed to vary
Fixed time slots and use synchronous multiplexing
For car locator or man locator and information inquiry
The amount of information that occurs sporadically and at one time, such as terminals,
For unspecified information, asynchronous
The multiplexing method enables high-speed time-division multiplexing of lines to transmit information, so remote control monitoring of a large number of signal controllers, information collection of various vehicle detectors, and communication with various terminal devices are performed with one dedicated line. Information exchange can be enabled.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a traffic signal control system according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an outline of the whole system configuration, and FIG. 2 shows a conceptual diagram relating to a traffic signal control system.

In this system, a central additional unit (hereinafter, referred to as "CCU") and a terminal additional unit (hereinafter, referred to as "TTR") using a 2400 bps two-wire full-duplex modem are added, and a signal line is used at high speed. By dividing and multiplexing, three traffic lights 1 are controlled in real time by one dedicated line,
Presence signals of up to 22 vehicle sensors 2 and 8 micro sensors
Microwave vehicle a sense of presence signals and sixteen of vehicle detectors 2 of the speed information of the wave-type vehicle sensitive knowledge unit 3, or up to 14 groups
While collecting velocity information of the knowledge unit 3, and enables the exchange of further 12 groups various information between the terminal device 4 and the central unit 50 to 53 of. At this time, the effective transmission speed of the communication path opened for communication with the various terminal devices is 960 bp upward.
s, 1536 bps downstream.

[0010] The configuration of the LAN in the terminal section includes four paths 6 using the TTR added to the traffic light 1 as a key station.
0 to 63, and each path can be selected from a wireless configuration to which a wireless interface device (hereinafter referred to as “R-I / F”) is added and a wired configuration by direct connection, and the degree of freedom is high. System. These paths 6
Terminal devices of various systems such as various vehicle sensors 2, 3 and a parking meter monitoring system 7 and an information inquiry system 8 are provided in a total of 12 terminal device interface devices (hereinafter referred to as " TCU 1"). Alternatively, the connection is established via a terminal wireless interface device (hereinafter referred to as “R- TCU ”). When a path is configured by wire, one signal controller 11 is connected to one path via a terminal device interface device (hereinafter, referred to as “ TCU 2”).

Next, the transmission method will be described. Regarding the definition of the transmission format and the protocol, the following points are considered from the restrictions of the current traffic signal system. The real-time control of the plurality of traffic lights 1 can be performed, and the confirmation signal for the step signal from the central device arrives at the central device within one second. The presence signal of the ultrasonic vehicle sensor 2 can be transmitted. The speed information of the microwave type vehicle sensor 3 can be transmitted simultaneously with the presence signal.

(A) FIG. 3 shows a downlink transmission format between the CCU and the TTR. On the leased line, a frame is formed at a period of 200 ms, and the frame is divided into five slots. Command information for signal control for three units is allocated to slot 0 (SO0), and the other slots (SL0 to SL4) are allocated as general information to each terminal device. The CCU divides information (block) from each system into a plurality of packets 9 and inserts them into slots. The header section 91 of the packet 9 contains a terminal device number, an emergency type, an information attribute, an information type, and the like. The TTR sees the path number (arrow A) in the packet header 91 and distributes the packet 9 to the path.
At this time, those having a high urgent level are transmitted prior to other packets. The terminal device reassembles the arriving packet and restores the information (block). It should be added on the application side. An effective transmission rate of 1536 bps (calculated only by the information section) can be assigned for information distribution to the terminal device.

(B) FIG. 4 shows an uplink format between the CCU and the TTR. On a dedicated line, a frame is composed in 400 ms,
This is divided into eight slots. Confirmation information of signal control for three units is assigned to slot 0 and slot 4, and the other slots (SL1 to 3, SL5
7) are assigned as general information from each terminal device to each system. The first part of each slot has an ultrasonic vehicle detector 2
And the speed information from the microwave type vehicle detector 3 are inserted. Information (block) from the terminal device is divided into a plurality of packets 9, inserted into these slots, and transmitted to the central device of each system. The header section 91 of the packet 9 contains a terminal device number, a new TTR path number, an emergency type, an information attribute, an information type, and the like. 960 bps is allocated for collecting information from the terminal device.

(C) FIG. 5 shows a transmission format of the terminal section wired network. On the terminal section wired network, the new TTR is 20
A frame is composed of 0 ms, and the frame is divided into four slots and transmitted. Command information for signal control and confirmation information from a traffic signal are inserted into the slot (SL0). The traffic signal performs the stepping operation with the “command information” of SL0, and then sends the confirmation information back to the center with the “confirmation information” of the next SL0. Slots (SL1 to 4) other than SL0 are allocated as general information to each system. In the first part of each slot, a presence signal of an ultrasonic vehicle sensor or the like and speed information of a microwave type vehicle sensor are inserted. The header section 91 of the packet 9 includes an information source ( TC
U number), information destination, information attribute, information type, and the like.

Next, a multiplexing method according to the present invention will be described. The multiplexing method includes a frequency division method (FDM) in which multiplexing is performed on the frequency axis and a time division multiplexing method (T
DM), and two types of time division multiplexing methods are synchronous time division multiplexing (STDM) and asynchronous time division multiplexing (AST).
DM). In the synchronous time division method, data information having the same clock frequency with the same phase is scanned and multiplexed according to the multiplicity. As shown in FIG. 6, channels A to D are sequentially scanned, and the information is transmitted in a predetermined slot. In this method, digital signals sent from different devices must be processed at the same timing, which makes the synchronization mechanism somewhat complicated and allocates slots to each channel in order even when there is no data. However, there is a disadvantage in that the efficiency must be reduced because of the necessity of the above.

In the synchronous multiplexing method, time slots must be allocated in sequence even when there is no data. In the asynchronous multiplexing method, information with an address added to a time slot is inserted as shown in FIG. Thus, the slot is effectively used. However, in the asynchronous multiplexing method, the transmission waiting time varies, so that in the case of communication in which the input bit strings must be equal in speed, such as voice, it is necessary to correct this on the receiving side. For example, considering the multipurpose use of police lines, etc., information on real-time control of traffic signals and presence signals of vehicle detectors are information that always occurs at regular intervals. To avoid this, a synchronous multiplexing method is appropriate. On the other hand, the information of the terminal device of each system is sporadic, and the asynchronous multiplexing method is more suitable.

Therefore, the system of the present invention uses a system combining both of them, and FIG. 8 shows a conceptual diagram thereof. For those that must always transmit the status, such as the presence signal and speed information of the vehicle detector, use a synchronous multiplexing method with fixed time slots, and use non-similar information such as information from and to the terminal. Asynchronous multiplexing in the form of packets is used for various types of information that occur periodically.

Next, a transmission scheme of the terminal section wireless network when the terminal section network is wirelessly configured as shown in FIG. 9 will be described.

FIG. 10 shows the configuration of one cycle of the line control system of the fixed system. The number of slots per radio line channel is 24, and one cycle is a 1200 ms period. First slot (SL
0) is assigned to the master station (TTR). Therefore, the radio terminal stations (R- T
CU ), which is 23 stations.

When the master station of a group composed of a small number of wireless terminal stations is adjacent within a distance of 200 m,
It is possible to divide and use 24 slots in a plurality of groups. In any case, the terminal station can transmit data using one slot every 1.2 seconds.

FIG. 11 shows an example of line control by two groups (when one TTR uses one wave) in a fixed system. SL0 is the R-I / F connected to TTR # 1
Using the downlink information for the first group of R- TCU from, SL1～11 is used in the uplink information of the first group R- TCU. SL12 is connected to RTR connected to TTR # 2.
Using the downlink information for the second group of R- TCU from -I / F, the SL13~23 the second group R- TC
U is used for uplink information. TTR2 uses SL12 at t12 seconds after receiving SL0 from TTR1, and uses the R- TC of the second group.
Transmit information to U. R- TCU second group transmits the uplink information after a lapse of each specified time (t1~t11) from receiving the SL12.

When one channel is shared by the fixed system and the mobile system, the fixed system communication shares the communication path and transmission system between the CCU and the TTR . Does not interfere with fixed communication. Reduce connection time. Prevents collisions between mobile terminal stations. Need to be considered. Therefore,

Based on a fixed system, areas for fixed allocation slots and random access slots are provided. The R-I / F notifies the mobile terminal station of an accessible empty slot among the random access slots. To access time within 400 ms, to disperse the assignment of fixed-line slots and a random access slot. The calling mobile terminal station confirms the response from the TTR, and retransmits when there is a collision. Structured.

FIG. 12 shows a configuration example of the shared system, FIG. 13 shows a configuration of one cycle of the shared system, and FIG. 14 shows an example of line control. SL0 is used for downlink information from the TTR to the R- TCU of the first group and the mobile terminal, and SL1 to SL7 are used.
Is used for uplink information of the R- TCU of the first group and the mobile terminal station. SL8 is used for downlink information from the TTR to the R- TCU of the second group and the mobile terminal, and SL9 to 15 are used.
Is used for uplink information of the R- TCU of the second group and the mobile terminal station. SL16 transmits a third group of R- TCUs from the TTR.
And for downlink information to mobile terminal stations, SL17 to
23 is used for the uplink information of the R- TCU of the third group and the mobile terminal station. The R- TCU and the mobile terminal of the first group are SL
After receiving the “0”, the uplink information is transmitted after a specified time (t1 to t7) has elapsed. The R- TCU of the second group and the mobile terminal are SL
8, after a specified period of time (t1 to t7) has elapsed from the reception of the uplink information. The third group of R- TCUs and mobile terminals is SL
Specified time after receiving 16 (t1 to t7)
After that, the uplink information is transmitted. When the mobile terminal station desiring communication receives the empty slot information from SL0, it transmits uplink information after a lapse of time (t1 to t7) corresponding to the empty slot to be transmitted. When a mobile terminal station desiring communication receives empty slot information from SL8, it transmits uplink information after a lapse of time (t1 to t7) corresponding to an empty slot to be transmitted. When the mobile terminal station desiring communication receives the empty slot information from SL16, it transmits uplink information after a lapse of time (t1 to t7) corresponding to the empty slot to be transmitted.

Next, the configuration of the slot will be described with reference to FIG. One cycle of the signal is 1200 ms, and is composed of 24 slots. One slot is 50 ms. A guard time zone of 1 ms is provided at each of the first and last portions of the slot, and it is assumed that transmission does not rise or fall during this time. The transmission start-up time is 5 ms. The bit synchronization signal is 8 bytes (2 ms), and "11" and "00" are repeated with 2 bits as one symbol. (“11001100... 11001100”) The frame synchronization signal is composed of 16 bits, and the bit pattern is as follows. “1111011001010000” The data part is 150 bytes, and the details will be described in the next section.

The structure of the data part of the downlink information is shown in FIG.
FIG. 17 shows the configuration of the data portion of the uplink information. The breakdown of the data section is as follows.

(A) Downlink information NUN TTR number When the 0-71B × 11 waves are used by two or more R / I / Fs, the number of the R / I / F is entered. ADA ──┐ │ ADB ├─ Packet 11B × 9 │ SUM │ (refer to 2.4.2) │ I0 to I17──┘ CRC Error detection signal 2B × 1 Empty 8B × 1 Error correction code 40B × 1 (Read Solomon code)

(B) Uplink information NUN R-I / F number When using 0-71B × 11 waves in two or more R-I / Fs, enter the R-I / F numbers. DET Vehicle sensor presence signal 3B × 4 DEV Speed information 3B × 2 ADA────┐│ ADB {Packet 11B × 9│SUM││I0-I7──┘ CRC Error detection code 2B × 1 Empty 8B × 1 Error correction code 40B × 1

[0029]

According to the traffic signal control system of the present invention,
As described above, the dedicated line of the TDM-FS system (bandwidth item 3.
4kHz) at a high speed, combining the synchronous multiplexing method and the asynchronous multiplexing method, enables remote control monitoring of a plurality of signal controllers and information collection of various vehicle sensors on one line, and various terminal devices. Multi that made it possible to exchange information
-A TDM system is constructed, which is particularly useful as a remote control monitor for traffic signal devices, etc., and can perform appropriate signal management based on road traffic information in real time and accurately grasp such road traffic information. The effect after implementation of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a traffic signal control system according to the present invention.

FIG. 2 is a conceptual diagram of a traffic signal control system.

FIG. 3 shows a downlink transmission format between a central additional device and a terminal additional device.

4 is an uplink transmission format between the central additional devices and end late addition device.

FIG. 5 is a transmission format of a terminal section wired network.

FIG. 6 is an explanatory diagram showing a synchronous time division multiplexing method.

FIG. 7 is an explanatory diagram showing an asynchronous multiplexing method.

FIG. 8 is an explanatory diagram showing a combination of a synchronous time division multiplexing method and an asynchronous multiplexing method.

FIG. 9 is a block diagram showing a configuration example of a wireless LAN between terminals in a fixed system.

FIG. 10 is an explanatory diagram showing a configuration of one cycle of a fixed system.

FIG. 11 is an explanatory diagram showing an example of line control in a fixed system.

FIG. 12 is a block diagram illustrating a configuration example of a wireless LAN between terminals in a shared system.

FIG. 13 is an explanatory diagram showing a configuration of one common cycle.

FIG. 14 is an explanatory diagram showing an example of line control in a shared system.

FIG. 15 is an explanatory diagram showing a configuration of a slot.

FIG. 16 is an explanatory diagram showing a configuration of a data section of downlink information.

FIG. 17 is an explanatory diagram showing a configuration of a data section of uplink information.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Traffic signal 2 Ultrasonic type vehicle detector 3 Microwave type vehicle detector 4 Terminal device 50-53 Central device 60-63 Pass 7 Parking meter monitoring system 8 Information inquiry system 9 Packet CCU Central addition device TTR Terminal addition device RI / F wireless interface device TCU 1, 2 terminal equipment interface device R- TCU terminal air interface apparatus SL1~16 slot

Continued on the front page (72) Inventor Takemi Fukumitsu 1-3-12 Moto-Akasaka, Minato-ku, Tokyo Sumitomo Electric Industries, Ltd. (72) Inventor Masao Mizuno 10 Okadodo-cho, Ukyo-ku, Kyoto-shi, Kyoto OMRON Corporation (72) Inventor Akio Kuniyasu 3-3-1 Marunouchi, Chiyoda-ku, Tokyo Nippon Signal Co., Ltd. (72) Nobuhiro Hanba 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. In-company (56) References JP-A-1-175700 (JP, A) JP-A-1-173934 (JP, A) JP-A-1-185799 (JP, A) JP-A-52-100913 (JP, A) JP-A-62-135033 (JP, A) JP-A-1-144829 (JP, A) JP-B-53-20635 (JP, B2) JP-B-58-10022 (JP, B2)

Claims (3)

(57) [Claims] 1. For a plurality of centralized controls installed at intersections, etc.
Terminal devices such as signal controllers, variable information boards and monitoring televisions
And the central additional equipment via a communication medium.
-For mobile objects targeting locators or man locators, etc.
Information transfer and these mobilesFromSporadic and simultaneous
Input information whose amount of information is unspecified, and
To control the entire local signaling device
Various location systems to grasp the communication media
ByIn performing data communication,  Central using a telephone line between the transmitting and receiving devices of the communication medium
Configure additional equipment and terminal additional equipment, and multiplex between both equipment.
Synchronous time division multiplexing of time division multiplexing performed on the time axis and
Data slots alternately continuous with asynchronous time division multiplexing
And time-division multiplexing the line,Real-time control of multiple traffic lights
Occurs at regular intervals, such as information about the vehicle or the presence signal of a vehicle detector
Information that does not allow for variations in arrival times
For synchronous multiplexing with fixed time slots
Depending on the conversion method, In addition, the car locator or man locator or information inquiry
The amount of information that occurs sporadically at one time and at a time
For unspecified information, asynchronous
Depending on the weighting method , One dedicated line, multiple signal controllers
Remote control monitoring and information collection of various vehicle detectors and various terminals
Information exchange with equipmentCharacterized by the ability toTraffic signal control
system. 2. The communication device according to claim 1, further comprising:
2. The traffic signal control system according to claim 1, further comprising a line type full-duplex modem. 3. The traffic signal control system according to claim 1, wherein said terminal section network is wirelessly configured.