WO2022208633A1 - 通信端末、信号制御装置、通信端末の制御方法及びプログラム記録媒体 - Google Patents
通信端末、信号制御装置、通信端末の制御方法及びプログラム記録媒体 Download PDFInfo
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- WO2022208633A1 WO2022208633A1 PCT/JP2021/013408 JP2021013408W WO2022208633A1 WO 2022208633 A1 WO2022208633 A1 WO 2022208633A1 JP 2021013408 W JP2021013408 W JP 2021013408W WO 2022208633 A1 WO2022208633 A1 WO 2022208633A1
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- antenna
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- communication
- traffic flow
- communication terminal
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- 238000004891 communication Methods 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims description 19
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 230000001186 cumulative effect Effects 0.000 claims description 6
- 238000010295 mobile communication Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000006870 function Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
Definitions
- the present invention relates to a communication terminal, a signal control device, a communication terminal control method, and a program recording medium.
- Non-Patent Document 1 The installation of a base station for the 5th generation mobile communication system (hereinafter “5G base station”) in a traffic signal (hereinafter “traffic signal”) is under consideration.
- 5G base station for the 5th generation mobile communication system
- traffic signal a traffic signal
- Non-Patent Document 1 it is assumed that an antenna will be installed on the upper part of the signal pole (see slide 7 “2. Network architecture study for combining 5G technology with traffic lights”). Further, it is described that when a directional antenna is used as the antenna, three antennas are required to emit radio waves over 360 degrees.
- a 5G terminal is connected to a signal control device that controls a traffic light, communicates with the traffic control system via the 5G base station, and is used for traffic control.
- Patent Document 1 discloses a disaster-prevention signal-controlled radio system that is installed in traffic lights.
- the signal control radio master station is installed at a relatively high position such as on a building or an antenna tower, and the signal control radio slave station is installed on a signal pole. (See Figure 1).
- Signal control devices are often installed on the ground near intersections in consideration of ease of maintenance and the like.
- Non-Patent Document 1 installation of 5G base stations on signal poles is being considered.
- a 5G terminal connected to the signal control device may be connected to an antenna installed on a signal pole across the road.
- a communication terminal connects to a base station on a signal pole located across a road, there is a problem that communication between the communication terminal and the base station is affected by passing vehicles or the like. The above problem can occur not only when the antenna is installed at the base station, but also when it is installed on a pole or the like near the signal.
- a first antenna is installed at a first position across a first road
- a second antenna is installed at a second position across a second road that intersects the first road.
- a communication means capable of communicating by wirelessly connecting to a base station connected to the first antenna and the second antenna, and the first road or the traffic flow detection means for detecting traffic flow on at least one of a second road; and selection means for selecting an antenna to be connected from the first antenna and the second antenna according to the traffic flow.
- a first antenna is installed at a first position across a first road
- a second antenna is installed at a second position across a second road that intersects with the first road.
- a communication means capable of communicating by wirelessly connecting to a base station connected to the first antenna and the second antenna, and the first road or the traffic flow detection means for detecting traffic flow on at least one of the second roads; selection means for selecting an antenna to be connected from the first antenna and the second antenna according to the traffic flow;
- Signal control means for controlling a traffic signal based on control information received from a predetermined traffic control system using communication means, and a signal control device are provided.
- a first antenna is installed at a first position across a first road
- a second antenna is installed at a second position across a second road that intersects with the first road.
- a communication terminal that selects one of the second antennas and is equipped with communication means capable of wirelessly connecting to and communicating with a base station connected to the first antenna and the second antenna; Controlling a communication terminal, detecting traffic flow on at least one of the first road and the second road, and selecting an antenna to be connected from the first antenna and the second antenna according to the traffic flow.
- a method is provided. The method is tied to a specific machine, a communication terminal equipped with communication means capable of communicating wirelessly with said two or more antennas.
- a computer program (hereinafter referred to as program) is provided for realizing the functions of the communication terminal or signal control device described above.
- the computer program is input to the computer device from an input device or an external communication interface, is stored in the storage device, and drives the processor according to predetermined steps or processes.
- this program can display the results of processing, including intermediate states, at each stage via a display device as required, or can communicate with the outside via a communication interface.
- a computer device for this purpose typically includes, as an example, a processor, a storage device, an input device, a communication interface, and optionally a display device, all of which are connectable to each other via a bus.
- the program can also be recorded on a computer-readable (non-transitory) storage medium. That is, the present invention can also be embodied as a computer program product.
- the present invention it is possible to stabilize the communication quality of a communication terminal that communicates with a base station installed on or near a signal pole.
- FIG. 3 is a diagram for explaining the arrangement of antennas and communication terminals according to the first embodiment of the present invention
- 1 is a functional block diagram showing the configuration of a communication terminal according to a first embodiment of the invention
- FIG. 4 is a flow chart showing the operation of the communication terminal according to the first exemplary embodiment of the present invention
- FIG. 4 is a functional block diagram showing the configuration of a communication terminal according to a second embodiment of the present invention
- FIG. 10 is a diagram for explaining an example of statistical information recorded by the communication terminal according to the second embodiment of this invention; It is a figure for demonstrating the operation
- FIG. 11 is a functional block diagram showing the configuration of a signal control device according to a third embodiment of the present invention; It is a figure which shows the structure of the computer which can function as a communication terminal or a signal control apparatus of this invention.
- connection lines between blocks in drawings and the like referred to in the following description include both bidirectional and unidirectional connections.
- the unidirectional arrows schematically show the flow of main signals (data) and do not exclude bidirectionality.
- ports or interfaces at input/output connection points of each block in the figure they are omitted from the drawing.
- a program is executed via a computer device, and the computer device includes, for example, a processor, a storage device, an input device, a communication interface, and, if necessary, a display device.
- this computer device is configured to be able to communicate with internal or external devices (including computers) via a communication interface, whether wired or wireless. ⁇
- the present invention can be realized by a communication terminal 10 comprising communication means 11, traffic flow detection means 12, and selection means 13, as shown in FIG.
- the communication means 11 connects a first antenna 20a installed at a first position facing each other across a first road and a second road intersecting the first road. Select one of the second antennas 20b installed at a second position sandwiching and facing each other, and communicate by wirelessly connecting to the base station connected to the first antenna and the second antenna. configured as possible.
- the traffic flow detection means 12 detects traffic flow on at least one of the first road and the second road. Then, the selection means 13 selects an antenna to be connected from the first antenna and the second antennas 20a and 20b according to the traffic flow. As a method of selecting an antenna according to the traffic flow, it is conceivable to select the antenna with the smaller number of obstacles moving between the antennas 20a and 20b and the communication terminal 10. . In addition, a method of detecting and comparing the traffic flows of both the first and second roads can be considered for the road with less traffic flow. Further, the traffic flow on at least one of the first and second roads is detected, and if the traffic flow is low, the antenna installed at the position across the road is selected, and if the traffic flow is high, the other antenna is selected. can also be adopted.
- FIG. 2 is a diagram showing the system configuration of the first embodiment of the present invention. Referring to FIG. 2 , a configuration in which a 5G base station is mounted on a signal pole 600 and a traffic control system 400 and a signal control device 300 can be connected via a 5G core network 250 is shown.
- the 5G base station includes a CU (Central Unit) 240, a Distributed Unit (DU) 230, Radio Units (RU) 220a and 220b, and antennas (ANT) 210a and 210b.
- CU Central Unit
- DU Distributed Unit
- RU Radio Units
- ANT antennas
- the CU 240 is placed between the core network 250 and one or more DUs 230 and functions as a data processing unit.
- DU 230 is connected to RUs 220a and 220b and is responsible for radio signal processing.
- the CU 240 is installed on the roof of a building near the intersection or on a steel tower nearby.
- Non-Patent Document 1 discusses installing the DU 230 in the middle or upper section of the signal pole 600 . The reason is that it is assumed that the RUs 220a and 220b are connected by optical fibers.
- RUs 220a and 220b are connected to DU 230 via optical fibers indicated by thick lines in FIG. 2, mutually convert digital signals and analog signals, and transmit and receive signals to and from communication terminal 100 via antennas 210a and 210b. From the viewpoint of connection with the antennas 210a and 210b, it is desirable that the RUs 220a and 220b be installed as close to the antennas 210a and 210b as possible.
- the RUs 220a, 220b can also be installed on the upper part of the signal pole 600, for example, on the light unit 500 of the signal, as shown in FIG. RUs 220a and 220b that are integrated with the antennas 210a and 210b can also be used.
- the antennas 210a and 210b are connected to the RUs 220a and 220b, respectively, and transmit and receive analog signals between the RUs 220a and 220b and the communication terminal 100.
- directional antennas such as Massive MIMO (Multiple-Input And Multiple-Output) antennas can be used in order to achieve high speed and large capacity, which is one of the features of 5G.
- one antenna is shown in one signal pole 600 in FIG. 2, a plurality of antennas may be connected to one RU.
- Non-Patent Document 1 it is possible to adopt a configuration in which three antennas capable of covering 120 degrees are provided to cover 360 degrees.
- antennas 210 a and 210 b are preferably installed at positions suitable for line-of-sight communication with communication terminal 100 .
- the antennas 210a, 210b may be installed on the upper part of the signal pole 600, eg, on the light fixture 500 of the traffic signal, as shown in FIG.
- the communication terminal 100 is connected to the signal control device 300 and connects to the 5G network via one of the RUs 220a and 220b. Communication terminal 100 provides a communication function to signal control device 300 . A detailed configuration of communication terminal 100 will be described later with reference to FIG.
- the signal control device 300 uses the communication terminal 100 to connect to the traffic control system 400 or an MEC (Multi-access Edge Computing) server under its control to perform traffic control communication.
- the traffic control communication includes information received from the communication terminal 100, traffic volume and emergency vehicle passing information collected by other sensors, signal control based on the signal lighting conditions of surrounding intersections, and the like.
- the traffic control system 400 performs signal control, etc., based on the information received from the communication terminal 100, the traffic volume and emergency vehicle passage information collected by other sensors, and the signal lighting status of surrounding intersections. Although omitted in FIG. 2, the traffic control system 400 may include subordinate MEC servers, and these MEC servers may be responsible for some of the functions.
- FIG. 3 is a diagram for explaining the arrangement of antennas 210a and 210b and communication terminal 100 in the first embodiment of the present invention.
- communication terminal 100 is installed near signal control device 300 at an intersection, and antenna 210a is installed at traffic light 500a at a first position across a first road.
- the antenna 210b is assumed to be installed at the traffic signal 500c at the second position across the second road that intersects with the road.
- communication terminal 100 can select either antenna 210a or 210b according to the traffic flow to communicate with RUs 220a and 220b. Also, if there are third and fourth antennas and RUs, these may be installed in the traffic lights 500b and 500d.
- FIG. 4 is a functional block diagram showing the configuration of the communication terminal 100 according to the first embodiment of the present invention. Referring to FIG. 4, a configuration including communication section 110, signal control information acquisition section 120, and antenna selection section 130 is shown.
- the communication unit 110 connects to the RUs 220a and 220b via the antennas 210a and 210b and performs communication.
- the communication unit 110 itself can be similar to a general 5G terminal.
- the signal control information acquisition unit 120 acquires signal control information from the signal control device 300 .
- the signal control information it is possible to use a control parameter for controlling the lighting state of the traffic light at the intersection or information indicating the lighting state of the traffic light.
- the signal control information acquisition unit 120 functions as traffic flow detection means for detecting traffic flow on roads using these signal control information.
- the signal control information is not limited to the above example, and the signal control information acquisition unit 120 receives an explicit signal control instruction from the traffic control system 400 and information indicating the lighting state of the signal lamp, and determines the traffic flow of the road. A method of detecting is also employable.
- the antenna selection unit 130 selects the antennas 210a and 210b to which the communication terminal 100 is connected according to the traffic flow specified from the signal control information.
- the antenna selection unit 130 and the communication unit 110 may be integrated.
- FIG. 5 is a flow chart showing the operation of the communication terminal according to the first embodiment of the present invention.
- communication terminal 100 acquires signal control information from signal control device 300 (step S001). In some traffic lights, signal control information may not change for a certain period of time. In this case, communication terminal 100 can omit step S001.
- the communication terminal 100 selects an antenna to be connected based on the acquired signal control information (step S002).
- the communication terminal 100 can reduce the influence of passing vehicles between the antennas 210a and 210b and the communication terminal 100 by selecting antennas as follows.
- a virtual straight line is drawn between communication terminal 100 and antennas 210a and 210b. If there is no obstruction between these straight lines, communication terminal 100 can perform line-of-sight communication with antennas 210a and 210b.
- the communication terminal 100 selects the antenna 210b when the lights of the traffic lights 500b and 500d are green. At least, while the traffic lights 500b and 500d are green, the traffic lights 500a and 500c are not green. For example, when the lights of the traffic lights 500a and 500c are red, the vehicle stops before the stop line, so the vehicle does not pass between the communication terminal 100 and the antenna 210b. Depending on the intersection, it is conceivable that the lamps of the traffic lights 500a and 500c are flashing red lights. inter-communications are less likely to be affected.
- communication terminal 100 performs an operation of switching the connected antenna to antenna 210a. While the lights of the traffic lights 500a and 500c are green, the lights of the traffic lights 500b and 500d are lights other than green. Communication terminal 100 can reduce the possibility that communication between communication terminal 100 and antenna 210b will be affected by switching the connected antenna to antenna 210a.
- the straight line connecting the communication terminal 100 and the antennas 210a and 210b does not intersect the lane whose lighting state is green, so that the antenna is selected and connected. Communication between base stations can be stabilized.
- the frequency band used between the RUs 220a and 220b and the communication terminal 100 is not particularly limited.
- 5G is expected to use a frequency band called Sub6 (5G NR FR1) and a frequency band called millimeter wave band (5G NR FR2), but the millimeter wave band (5G NR FR2) is more You will get great results.
- an inter-base station handover occurs between the communication terminal 100 and the base stations (RUs 220a and 220b). If necessary, it is preferable that the RU 220a and RU 220b carry out a process of handing over the session state and the like between the traffic control center, the MEC server under its control, and the communication terminal 100 in advance.
- the communication terminal 100 which provides the 5G connection function to the signal control device 300, is configured to select an antenna according to the traffic flow.
- FIG. 6 is a functional block diagram showing the configuration of the communication terminal 100a according to the second embodiment of the present invention.
- the difference from the communication terminal 100 of the first embodiment shown in FIG. 4 is that a statistical information recording unit 140 is added, and the antenna selection unit 130a selects an antenna based on statistical information. is.
- FIG. 7 is a diagram for explaining an example of statistical information recorded by the statistical information recording unit 140.
- the statistical information is statistical information regarding communication of the antenna 210 .
- the time when the communication interruption occurred accumulated time
- the number of times of momentary interruption, and the like are listed.
- the selected antenna and the time when the communication was interrupted at that time are recorded at regular time intervals.
- communication interruption occurs when the antenna 210b is selected.
- There are various possible causes for this interruption of communication. One of them is, as shown in FIG. This is thought to be due to an increase in the number of cases where trains cross the stop line and stop.
- the antenna selection unit 130a refers to the statistical information, and when the antenna selected by the signal control information is expected to deteriorate the communication quality, instead of selecting the antenna by the signal control information, the antenna selection unit 130a selects an antenna based on the statistical information. make a choice. For example, if the situation shown in FIG. 8 occurs, antenna 210a is selected instead of antenna 210b.
- the statistical information referred to by the antenna selection unit 130a may be the most recent statistical information as shown in FIG. etc. In addition to the most recent recorded values as shown in Fig. 7, the statistical information includes past recorded values of the same time period and recorded values of the same time period on the same day of the week that have undergone statistical processing such as averaging. may
- FIG. 9 is a flow chart showing the operation of the communication terminal 100a according to the second embodiment of the present invention. Since the operations of steps S001 and S002 of FIG. 9 are the same as those of the first embodiment, description thereof will be omitted.
- the communication terminal 100a refers to the statistical information and checks whether the antenna selected by the signal control information is expected to deteriorate the communication quality (steps S200, S201). For example, as shown in FIG. 7, when the most recent statistical information indicates that communication is interrupted when antenna 210b is selected, communication terminal 100a predicts that communication quality will deteriorate with antenna 210b. Conversely, if the most recent statistical information indicates that communication interruption has not occurred when antenna 210a is selected, communication terminal 100a predicts that communication quality will not deteriorate with antenna 210a.
- the communication terminal 100a does not change the antenna selected in step S002.
- the communication terminal 100a selects an antenna based on the statistical information (step S202). For example, as shown in FIG. 7, communication terminal 100a selects antenna 210a when antenna 210a is expected to improve communication quality more than when antenna 210b is selected. Note that changing the antenna here is not essential. For example, if the antenna 210a is selected as a result of referring to the statistical information and further deterioration in communication quality is expected, the antenna 210b may be selected.
- the statistical information recording unit 140 records the selected antenna and the time when the communication interruption occurred (cumulative time in the corresponding time period) at regular intervals.
- the statistical information is not limited to this example.
- the number of communication interruptions may be recorded as statistical information, and the degree of deterioration of communication quality may be determined based on the number of times.
- signal strength, SN ratio, and the like observed when each antenna is selected may be measured, and the degree of deterioration of communication quality may be determined using these values.
- the communication terminals 100 and 100a and the signal control device 300 are provided independently. Substantial communication capabilities can also be added.
- FIG. 11 is a functional block diagram showing the configuration of a signal control device 300a according to the third embodiment of the present invention. Referring to FIG. 11, a configuration including a communication section 310, a signal control information acquisition section 320, an antenna selection section 330, and a signal control section 340 is shown.
- the communication unit 310, the signal control information acquisition unit 320, and the antenna selection unit 330 perform operations corresponding to the communication unit 110, the signal control information acquisition unit 120, and the antenna selection unit 130 of the first embodiment, respectively. Since the basic operation is the same as that of the first embodiment, the explanation is omitted.
- the signal control unit 340 uses the communication unit 310 to control the traffic lights 500a to 500d based on the control information received from the traffic control system. Therefore, the signal control unit 340 functions as signal control means for controlling the traffic signal based on the control information received from the predetermined traffic control system using the communication means. Also, the signal control unit 340 provides signal control information to the signal control information acquisition unit 320 .
- the present invention can also be implemented as a function of the signal control device 300a.
- the present invention is not limited to the above-described embodiments, and further modifications, replacements, and substitutions can be made without departing from the basic technical idea of the present invention. Adjustments can be made.
- the device configuration, the configuration of each element, and the form of expression such as data shown in each drawing are examples for helping understanding of the present invention, and are not limited to the configuration shown in these drawings.
- a method of detecting traffic flow using signal control information was adopted, but the method of detecting traffic flow is not limited to this. For example, if a camera for capturing the lighting state of the signal and the vehicle is placed near the traffic light, the images obtained by these cameras may be used to detect the traffic flow. Further, for example, when vehicle sensors are provided near traffic lights, traffic flow may be detected using information from these sensors.
- the base station installed in the traffic light is a 5G base station, but in light of the principle of the present invention, the type of base station is not limited to a 5G base station.
- it may be a base station of LTE (Long Term Evolution) or a base station of a fifth generation mobile communication system.
- the base station may be a base station (roadside unit) for road-to-vehicle communication.
- the antennas are selected from two of the antennas 210a and 210b, but the arrangement of the antennas at the intersection is not limited to that illustrated in FIG.
- the antennas are selected from two of the antennas 210a and 210b, but the arrangement of the antennas at the intersection is not limited to that illustrated in FIG.
- FIG. 10 when a third antenna 210c installed in a traffic light 500b is available, a configuration for selecting this antenna can also be adopted.
- the antennas 210a and 210b are installed above the lamp 500 of the traffic signal, but the arrangement of the antennas in each traffic signal is not limited to that illustrated in FIG.
- a configuration in which mounting tables for the antennas 210a and 210b and the RUs 220a and 220b are installed directly above the signal poles of individual traffic lights is also conceivable. Even in this case, the present invention can be implemented without any problem.
- a program that causes a computer (9000 in FIG. 12) functioning as a communication terminal or signal control device to realize the functions of these devices.
- a computer is exemplified by a configuration comprising a CPU (Central Processing Unit) 9010, a communication interface 9020, a memory 9030, and an auxiliary storage device 9040 in FIG. That is, the CPU 9010 in FIG. 12 may execute the traffic flow detection program and the antenna selection program.
- CPU Central Processing Unit
- each part (processing means, function) of the above-described communication terminal or signal control device is realized by a computer program that causes the processor installed in these devices to execute each of the above-described processes using the hardware. can be done.
- the traffic flow detection means of the communication terminal described above detects the traffic flow using the lighting status of a traffic signal or a signal control signal, and the selection means selects one of the first antenna and the second antenna, A configuration can be adopted in which the straight line connecting the communication terminal and the first and second antennas does not intersect the lane whose lighting state is green and the antenna is selected for connection.
- the selection means of the communication terminal refers to the statistical information indicating the history of communication quality, and selects an antenna according to the traffic flow when communication quality is expected to deteriorate due to the selection of the antenna according to the traffic flow. Instead of selection, it is possible to employ a configuration in which antenna selection is performed based on the statistical information.
- the above statistical information includes the cumulative time of communication interruptions or the number of communication interruptions that occurred during the period of communication with the selected antenna, and the cumulative time of communication interruptions or the number of communication interruptions during communication with the selected antenna.
- a configuration can be adopted in which antenna selection is performed based on the statistical information.
- the first and second antennas are directional antennas of a base station of a fifth-generation mobile communication system that provides services to mobile bodies traveling on the road, and are connected to a traffic control system via the base station. , a configuration for performing traffic control communication with the traffic control system.
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Abstract
Description
続いて、本発明を信号柱に設置された5G基地局と通信する通信端末に適用した本発明の第1の実施形態について図面を参照して詳細に説明する。図2は、本発明の第1の実施形態のシステム構成を示す図である。図2を参照すると、信号柱600に、5G基地局を搭載し、交通管制システム400と、信号制御装置300とを、5Gコアネットワーク250を介して接続可能とした構成が示されている。
続いて、第1の実施形態の通信端末に統計情報に基づいたアンテナの選択機能を追加した第2の実施形態について図面を参照して詳細に説明する。第2の実施形態の構成及び動作は第1の実施形態とほぼ共通するため、以下、その相違点を中心に説明する。
上記した第1、第2の実施形態では、通信端末100、100aと信号制御装置300とが独立して設けられているものとして説明したが、信号制御装置300自体に上述の通信端末100、100a相当の通信機能を追加することもできる。
[第1の形態]
(上記第1の視点による通信端末参照)
[第2の形態]
上記した通信端末の交通流検出手段は、前記第1、第2の道路の双方の交通流を検出し、前記選択手段は、前記第1、第2のアンテナのうち、前記道路の交通流の少ない道路を挟んだ位置に設置されたアンテナを選択する構成を採ることができる。
[第3の形態]
上記した通信端末の交通流検出手段は、交通信号機の灯火状態又は信号制御信号を用いて、前記交通流を検出し、前記選択手段は、前記第1のアンテナ及び前記第2のアンテナのうち、前記通信端末と前記第1、第2のアンテナとを結んだ直線が、灯火状態が青信号である車線と交差しない方のアンテナを選択して接続を行う構成を採ることができる。
[第4の形態]
上記した通信端末の選択手段は、通信品質の履歴を示す統計情報を参照して、前記交通流に応じたアンテナの選択では通信品質の劣化が予想される場合、前記交通流に応じたアンテナの選択に代えて、前記統計情報に基づいたアンテナの選択を行う構成を採ることができる。
[第5の形態]
上記した統計情報は、前記選択したアンテナとの通信期間中に発生した通信中断の累計時間又は通信中断の発生回数を含み、前記選択中のアンテナとの通信中の通信中断の累計時間又は通信中断の発生回数の少なくとも一方が所定の基準を超えている場合、前記交通流に応じたアンテナの選択に代えて、前記統計情報に基づいたアンテナの選択を行う構成を採ることができる。
[第6の形態]
前記第1、第2のアンテナは、前記道路を通行する移動体にサービスを提供する第5世代移動通信システムの基地局の指向性アンテナであり、前記基地局を介して交通管制システムと接続し、前記交通管制システムと交通管制用通信を行う構成を採ることができる。
[第7の形態]
(上記第2の視点による信号制御装置参照)
[第8の形態]
(上記第3の視点による通信端末の制御方法参照)
[第9の形態]
(上記第4の視点によるプログラム参照)
なお、上記第7~第9の形態は、第1の形態と同様に、第2~第6の形態に展開することが可能である。
11 通信手段
12 交通流検出手段
13 選択手段
20a、20b アンテナ
100、100a 通信端末
110、310 通信部
120、320 信号制御情報取得部
130、130a、330 アンテナ選択部
140 統計情報記憶部
210a、210b アンテナ(ANT)
220a,220b Radio Unit(RU)
230 Distributed Unit (DU)
240 CU(Central Unit)
250 5Gコアネットワーク
300、300a 信号制御装置
340 信号制御部
400 交通管制システム
500 灯器
500a~500d 信号機
600 信号柱
9000 コンピュータ
9010 CPU
9020 通信インタフェース
9030 メモリ
9040 補助記憶装置
Claims (11)
- 第1の道路を挟んだ第1の位置に設置された第1のアンテナと、前記第1の道路と交差する第2の道路を挟んだ第2の位置に設置された第2のアンテナとのいずれかを選択し、前記第1のアンテナ及び前記第2のアンテナに接続された基地局に無線接続して通信可能な通信手段と、
前記第1の道路または前記第2の道路の少なくとも一方の交通流を検出する交通流検出手段と、
前記交通流に応じて、前記第1のアンテナ及び前記第2のアンテナから、接続するアンテナを選択する選択手段と、
を備えた通信端末。 - 前記交通流検出手段は、前記第1、第2の道路の双方の交通流を検出し、
前記選択手段は、前記第1、第2のアンテナのうち、前記道路の交通流の少ない道路を挟んだ位置に設置されたアンテナを選択する請求項1の通信端末。 - 前記交通流検出手段は、交通信号機の灯火状態又は信号制御信号を用いて、前記交通流を検出し、
前記選択手段は、前記第1のアンテナ及び前記第2のアンテナのうち、前記通信端末と前記第1、第2のアンテナとを結んだ直線が、灯火状態が青信号である車線と交差しない方のアンテナを選択して接続を行う請求項1又は2の通信端末。 - 前記選択手段は、通信品質の履歴を示す統計情報を参照して、前記交通流に応じたアンテナの選択では通信品質の劣化が予想される場合、前記交通流に応じたアンテナの選択に代えて、前記統計情報に基づいたアンテナの選択を行う、
請求項1から3いずれか一の通信端末。 - 前記統計情報は、前記選択したアンテナとの通信期間中に発生した通信中断の累計時間又は通信中断の発生回数を含み、
前記選択中のアンテナとの通信中の通信中断の累計時間又は通信中断の発生回数の少なくとも一方が所定の基準を超えている場合、前記交通流に応じたアンテナの選択に代えて、前記統計情報に基づいたアンテナの選択を行う、
請求項4の通信端末。 - 前記第1、第2のアンテナは、前記道路を通行する移動体にサービスを提供する第5世代移動通信システムの基地局の指向性アンテナであり、
前記基地局を介して交通管制システムと接続し、前記交通管制システムと交通管制用通信を行う請求項1から5いずれか一の通信端末。 - 第1の道路を挟んだ第1の位置に設置された第1のアンテナと、前記第1の道路と交差する第2の道路を挟んだ第2の位置に設置された第2のアンテナとのいずれかを選択し、前記第1のアンテナ及び前記第2のアンテナに接続された基地局に無線接続して通信可能な通信手段と、
前記第1の道路または前記第2の道路の少なくとも一方の交通流を検出する交通流検出手段と、
前記交通流に応じて、前記第1のアンテナ及び前記第2のアンテナから、接続するアンテナを選択する選択手段と、
前記通信手段を用いて所定の交通管制システムから受信した制御情報に基づいて、交通信号機を制御する信号制御手段と、
を備えた信号制御装置。 - 前記交通流検出手段は、前記第1、第2の道路の双方の交通流を検出し、
前記選択手段は、前記第1、第2のアンテナのうち、前記道路の交通流の少ない道路を挟んだ位置に設置されたアンテナを選択する請求項7の信号制御装置。 - 第1の道路を挟んだ第1の位置に設置された第1のアンテナと、前記第1の道路と交差する第2の道路を挟んだ第2の位置に設置された第2のアンテナとのいずれかを選択し、前記第1のアンテナ及び前記第2のアンテナに接続された基地局に無線接続して通信可能な通信手段を備えた通信端末が、
前記第1の道路または前記第2の道路の少なくとも一方の交通流を検出し、
前記交通流に応じて、前記第1のアンテナ及び前記第2のアンテナから、接続するアンテナを選択する、
通信端末の制御方法。 - 前記第1、第2の道路の双方の交通流を検出し、
前記第1、第2のアンテナのうち、前記道路の交通流の少ない道路を挟んだ位置に設置されたアンテナを選択する請求項9の制御方法。 - 第1の道路を挟んだ第1の位置に設置された第1のアンテナと、前記第1の道路と交差する第2の道路を挟んだ第2の位置に設置された第2のアンテナとのいずれかを選択し、前記第1のアンテナ及び前記第2のアンテナに接続された基地局に無線接続して通信可能な通信手段を備えた通信端末に搭載されたコンピュータに、
前記第1の道路または前記第2の道路の少なくとも一方の交通流を検出する処理と、
前記交通流に応じて、前記第1のアンテナ及び前記第2のアンテナから、接続するアンテナを選択する処理と、
を実行させるプログラムを記録したプログラム記録媒体。
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JP2012256162A (ja) * | 2011-06-08 | 2012-12-27 | Sumitomo Electric Ind Ltd | 路側通信機、無線通信システム、無線信号の受信方法及びコンピュータプログラム |
JP2020112851A (ja) * | 2019-01-08 | 2020-07-27 | 住友電気工業株式会社 | 車両通信制御装置、車両通信制御方法および車両通信制御プログラム |
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