JP2023008393A - Radio communication system - Google Patents

Abstract

To solve the problem of communication interruption caused by coping with radio wave inhibition after occurrence of the radio wave inhibition in the case of existence of an obstacle object in a communication area between a transmitter and a receiver.SOLUTION: A radio communications system comprises an information storage device for storing information on assumed radio wave inhibition with respect to an obstacle object that can be a radio wave inhibition factor, an object detector for detecting the object in a communication area, a radio wave inhibition analyzing unit that on the basis of the information stored in the information storage device, predicts radio wave inhibition to be caused by the object detected by the object detector, and a radio wave inhibition avoiding unit for performing a workaround for avoiding the predicted radio wave inhibition to perform the workaround before occurrence of the radio wave inhibition.SELECTED DRAWING: Figure 1

Description

The present application relates to wireless communication systems.

Wireless communication systems are widely used in consumer equipment communication systems. In addition, the application of wireless technology is expanding in industrial equipment. In particular, it is desired to make maximum use of wireless communication technology to improve productivity at manufacturing sites.

In order to make the most of wireless technology, it is important to deal with communication requirements unique to manufacturing systems and overcome communication obstacles. For example, if multiple IoT devices are introduced at a manufacturing site, and the radio waves emitted by these devices use the same frequency, mutual interference can cause communication failures, and it is possible that functions cannot be maximized. have a nature. Also, the presence of an object on the wireless path may hinder the wireless communication state.

In order to solve the problem in the state of wireless communication, in Patent Document 1, a sensor is used to detect an object (obstacle object) that may obstruct wireless propagation, and a wireless path is determined based on the detected information. , proposed a system for continuing wireless communication by switching to another alternative wireless path that is less susceptible to interference of wireless propagation.

Further, in Patent Document 2, when there is an obstacle, etc., a wireless relay device is autonomously installed in a place with a good radio wave environment so as to identify the position of the obstacle with a sensor and avoid the influence of the obstacle. By moving the object, the utilization efficiency of the spatial radio wave environment can be increased, and the position of the obstacle object that generates the interference wave can be specified from the correlation between the distance between the obstacle object and the wireless relay device and the level of the interference wave. The reliability of the wireless network between wireless devices that need to communicate continuously (high priority) by searching for the optimal wireless path and warning of obstacles that generate interference waves. A method for realizing a wireless communication system capable of increasing the is proposed.

In addition, in Patent Document 3, when an obstacle to communication is placed near a wireless device during operation of a wireless communication system, the obstacle to communication, such as a metal trolley, frequently moves and the system When a frequency interference source of another system using the same frequency is added, and if the communication state is determined to be abnormal, wireless movement to an optimal position that does not affect communication reliability before the communication reliability declines A method has been proposed in which a stable communication route is secured by moving or adding a relay terminal to perform wireless communication, thereby preventing deterioration in reliability of communication.

Japanese Patent Application Laid-Open No. 2019-12972 JP 2020-17835 A JP 2008-79226 A

However, in the method of Patent Document 1, if there is an obstacle that may block radio waves in the optimal path for wireless propagation, the number of wireless relay devices will increase, resulting in a relay delay time. It takes extra time, and there is a possibility that the request for low delay cannot be satisfied. In addition, the sensor alone is used to determine whether or not to detect obstacles such as the human body that can interfere with wireless communication. There was a problem that it was generated and the communication became unstable. Furthermore, if there are multiple obstacles, such as human bodies, that can interfere with wireless communication, route switching will occur frequently. However, there was a problem that stable communication was not possible.

In the method of Patent Document 2, the position of the obstacle that generates the interference wave is identified from the correlation between the distance between the obstacle and the radio relay device and the level of the interference wave, and the optimum Although it is possible to move autonomously to the location of the repeater, it is necessary to move the repeater and the repeater itself moves. There is a problem that it is not possible to effectively identify radio wave obstruction factors.

In the method of Patent Document 3, when it is determined that the communication state is abnormal, the position of the obstacle object or the interference source that is the factor is estimated, and the relay terminal is moved or added so that the radio wave is not obstructed. As in Document 2, it is necessary to repeat the estimation of the position of the radio wave obstruction factor according to the movement of the relay device, and it takes time to determine the optimum position of the relay device. There was a problem that it could not be specified.

All of the prior arts deal with radio wave interference after it has occurred, and have the problem of being affected by radio wave interference. The present application was made in order to solve the above problems, and in a wireless communication network between high-priority points where continuous communication is necessary, information is provided in advance about objects that may cause radio wave obstruction. To provide a radio communication system that improves the radio wave environment of a radio network and improves radio reliability by accumulating radio waves and avoiding problems before radio wave interference occurs.

The wireless communication system of the present application includes an information storage device that accumulates information on the state of radio wave interference assumed to occur due to the presence of an object that can cause radio wave interference, and an object detection device that detects the object within the communication area. a radio wave interference analysis unit for predicting radio wave interference that will occur with respect to the object detected by the object detection device based on the information accumulated in the information storage device; and for avoiding the predicted radio wave interference. characterized by comprising a radio wave interference avoidance unit that implements the avoidance measure.

According to the wireless communication system of the present application, when an object that may cause radio wave interference is detected, based on the accumulated radio wave interference information, it is possible to take measures to avoid the obstacle before actual radio wave interference occurs. You can get the effect of being able to

1 is a configuration diagram of a radio communication system according to Embodiment 1; FIG. 4 is a flow chart showing the procedure of radio wave interference analysis in the wireless communication system of Embodiment 1; FIG. 10 is an explanatory diagram showing detection of an obstructing object in the wireless communication system according to the second embodiment; 1 is a hardware configuration diagram of a radio communication system; FIG.

Embodiment 1
Embodiment 1 will be described below with reference to the drawings. The same reference numerals in the drawings indicate the same or corresponding parts.
FIG. 1 shows a schematic configuration of a radio communication system according to Embodiment 1. As shown in FIG. This wireless communication system is a wireless communication system that comprehensively controls wireless communication such as time, space, frequency, people, objects, robots, and environments.

Conventional wireless communication systems detect obstacles that can cause radio wave interference between a radio transmitter and receiver, measure the effects of radio wave interference caused by the obstacles, and evaluate the effects. I try to keep it as small as possible.
On the other hand, in the wireless communication system of the present application, the characteristics (position, material, size), behavior (moving speed, moving direction, moving trajectory), ambient environment (temperature, Humidity), radio wave environment (desired wave/interference wave frequency, signal level, etc.) are learned in chronological order, and an object information learning device 10 is provided for accumulating in advance information on the effects of complex radio wave interference.

The object information learning device 10 includes an object setting device 11 that sets various types of obstacle objects, an obstacle assumption device 12 that assumes radio wave interference caused by the presence of the obstacle object, and a moving state of the obstacle object. and an information accumulation device 13 for accumulating information about radio wave interference assumed to occur accordingly. In this object information learning device 10, various obstacle objects are assumed, and radio wave interference states caused by various states of the obstacle objects are assumed, learned, and stored.

A plurality of obstacle objects present in the communication area between the transmitter and receiver are detected by the object detection device 20 . When a plurality of various obstacle objects are detected by the object detection device 20, the information of the detected obstacle objects and the information accumulated in the information storage device 13 are used for each of the plurality of obstacle objects. An assumed radio wave interference state is predicted by the radio wave interference analysis unit 30 . A workaround for avoiding this predicted failure is set and executed in the radio wave interference avoidance unit 40 . The results of prediction by the radio wave interference analysis unit 30 are arranged in descending order of the degree of influence of radio wave interference for each of the plurality of obstacle objects. Here, the object detection device 20 is composed of various sensors such as a camera, LIDAR, millimeter waves, and infrared rays.

In accordance with the order in which the degree of influence of radio wave interference is determined to be large, the radio wave interference avoidance unit 40 sets and executes corresponding avoidance measures. As avoidance measures in the radio wave interference avoidance unit 40, a warning display measure 401, a route switching measure 402, a transmission power control measure 403, and a frequency switching measure 404 are prepared.

The warning display measure 401 is to call attention to an obstacle object judged to have a large degree of influence as a radio wave obstruction factor by displaying a warning using a display device (smart glasses, monitor, display), etc. is. Here, radio wave interference may be avoided by not only displaying a warning display, but also guiding the obstacle so that it does not come to a position where radio waves are blocked, or restricting the movement of the obstacle.
The route switching strategy 402 specifies the position of an obstacle object that obstructs radio waves, analyzes the correlation of radio wave obstruction with respect to each position of the obstacle object, and switches the radio wave based on the analysis result. By switching the path, it is possible to eliminate obstructive factors, stabilize the radio wave environment for wireless communication, and improve the reliability of wireless communication.

The transmission power control measure 403 specifies the position of an obstacle object that obstructs radio waves, analyzes the correlation of radio wave obstruction with respect to each position of the obstacle object, and transmits based on the analysis result. By controlling the transmission power of radio waves, the radio wave environment for wireless communication is stabilized.
The frequency switching measure 404 identifies the position of an obstacle object that obstructs radio waves, analyzes the correlation of radio wave obstruction with respect to each position of the obstacle object, and transmits radio waves based on the analysis results. By switching the frequency, the radio wave environment for wireless communication is stabilized.
Here, in the analysis of the correlation of radio wave interference, in addition to the obstacle object itself, the ambient environment such as humidity and temperature may be analyzed. If there is a correlation between humidity and temperature, the radio wave environment can be stabilized by adjusting the humidity or temperature.

The avoidance measures prepared in the radio wave interference avoidance unit 40 can be expected to be effective even if they are implemented individually, but a plurality of avoidance measures can be superimposed and implemented. In that case, a combined effect can be expected.
By implementing the workaround, the countermeasure for the radio wave obstruction factor is completed. is configured to

The information collected by the information collection device 50 is analyzed by the obstruction situation analysis unit 60 for the results of the avoidance measures, and the results are accumulated in the object information learning device 10 and used for learning about the obstacle object. .
Analysis for specifying radio wave obstructions in the radio wave obstruction analysis unit 30 is performed according to the procedure shown in FIG.

First, as shown in the figure, information is received from the object detection device 20 (step S1), and it is determined whether or not there is an obstacle object that can be an obstacle within the communication area (step S2). If no obstructing object exists, receiving information from the object detecting device 20 is repeated after a predetermined time interval (step S3). If an obstacle object exists, the target obstacle object is specified (step S4), and the position of the obstacle object is specified (step S5).

The radio wave environment is measured for each position of the obstacle (step S6). As a result of measuring the radio wave environment, it is determined whether or not the obstructing object affects the radio wave environment (step S7). If the obstacle object does not affect the radio wave environment, the obstacle object is set as a monitoring target and changes in the position of the obstacle object are monitored (step S8). If the obstructing object corresponds to a radio wave obstructing object, it is specified as a radio wave obstructing object (step S9).
By performing this analysis, it is possible to prevent deterioration of the radio wave environment by calling attention in advance and not coming to a position where radio waves are blocked.
Here, in the measurement of the radio wave environment, for example, transmission error rate, transmission speed, desired wave (signal), interference wave (noise) level, S/N ratio (signal to noise ratio), link down, multipath, spectrum Distortion, multiple reception state, etc. are targeted (step S6). To determine whether or not the obstructing object affects the radio wave environment, for example, the side of the measured data is analyzed in time series, and determination is made based on the presence or absence of deterioration of the data (step S7).

Embodiment 2
In the first embodiment, it is described that the object detection device 20 detects a plurality of obstacle objects. A specific content of the detection of the plurality of obstacle objects will be described.
FIG. 3 is an explanatory diagram for explaining the outline of detection by the object detection device 20, and as shown in the figure, when wireless communication is performed between the first transceiver 31 and the second transceiver 32. It is assumed that the first transmitter/receiver 31 monitors the radio wave environment and sets and executes a workaround so that radio wave interference does not occur. In the case where the first transceiver 31 is moving toward the second transceiver as indicated by arrow A, the communication area for monitoring the radio wave environment is divided into a plurality of areas.

That is, the first wireless communication area 33, which is the shortest distance that linearly connects the first transceiver 31 and the second transceiver 32 and includes some changes in movement, and the first wireless communication area 33 and a second wireless communication area 34 located on the outer periphery of the area. Here, as obstacle objects, a first obstacle object 35 existing in a first wireless communication area 33 between the first transceiver 31 and a second transceiver 32, and a second wireless communication area 34 A second obstructing object 36 in position but moving toward the first wireless communication area 33 , within the first wireless communication area 33 but moving away from the second transceiver 32 . A third obstacle object 37 is assumed.

As shown in this figure, the first obstacle object 35 is subjected to the radio wave interference avoidance measure described in the first embodiment. Also, for the second obstacle object 36, the moving speed and moving direction are taken into consideration, and workarounds are executed as necessary. As for the third obstacle object 37, the direction of movement and the speed of movement must be taken into account, as with the second obstacle object 36. FIG. As shown in this figure, not only the first obstructing object 35 and the third obstructing object 37 located in the first wireless communication area 33, but also the second obstructing object located in the second wireless communication area 34 By monitoring the behavior of the obstructing object 36, future radio wave interference can be avoided.

As described above, by monitoring the position and movement of obstacles in various states and continuously monitoring the degree of influence of each obstacle on the radio wave environment, the future position of obstacles can be determined. To prevent deterioration of the radio wave environment in advance by calling attention in advance and avoiding coming to a position where radio wave interference is predicted, and when it is assumed that it will come to a specific position that is likely to interfere with radio waves. becomes possible.

An example of hardware of the wireless communication system 100 of the present application is shown in FIG. A wireless communication system 100 includes a processor 101 and a storage device 102. Although not shown, the storage device 102 includes a volatile storage device such as a random access memory and a nonvolatile auxiliary storage device such as a flash memory. Equipped with Also, an auxiliary storage device such as a hard disk may be provided instead of the flash memory.

Processor 101 controls, for example, wireless communication system 100 by executing a program input from storage device 102 . In this case, the program is input from the auxiliary storage device to the processor 101 via the volatile storage device. Further, the processor 101 may output data such as calculation results to the volatile storage device of the storage device 102, or may store the data in an auxiliary storage device via the volatile storage device.

Although the present application has described exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to application of particular embodiments, alone or Various combinations are applicable to the embodiments.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, the modification, addition, or omission of at least one component shall be included.

REFERENCE SIGNS LIST 10 target object information learning device 11 target setting device 12 failure assumption device 13 information storage device 20 target object detection device 30 radio wave interference analysis unit 31 first transceiver 32 second transceiver 33 1st radio communication area 34 2nd radio communication area 35 first obstacle object 36 second obstacle object 37 third obstacle object 40 radio wave interference avoidance unit 50 information collecting device 60 Inhibition situation analysis unit 100 Wireless communication system 101 Processor 102 Storage device 401 Warning display strategy 402 Route switching strategy 403 Transmission power control strategy 404 Frequency switching strategy

Claims (3)

An information storage device for accumulating information on radio wave interference assumed to be caused by an object that can cause radio wave interference, an object detection device for detecting the object within a communication area, and information stored in the information storage device a radio wave interference analysis unit that predicts radio wave interference caused by the object detected by the object detection device, and a radio wave interference avoidance unit that implements a workaround to avoid the predicted radio wave interference, based on A wireless communication system, comprising: 2. The wireless communication system according to claim 1, wherein the avoidance measure is at least one of a warning display measure, a route switching measure, a transmission power control measure and a frequency switching measure. The communication area is a first wireless communication area set between a first transceiver and a second transceiver, and a second wireless communication area set outside the first wireless communication area. 2. The wireless communication system according to claim 1, wherein the behavior of said object located in said second wireless communication area is monitored by a device.

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