JP2022098549A - Wireless communication system - Google Patents

Abstract

To provide a wireless communication system that can wirelessly communicate with the outside of a mobile body more easily by a mobile wireless terminal such as a smart phone or a tablet from the inside of the mobile body in which radio wave communication is blocked.SOLUTION: In a wireless communication system 1 provided on a traveling path 5 of a mobile body 2, the mobile body 2 in which radio wave communication is blocked is provided with a mobile access point 8a including a mobile-body-outside antenna 6a outside the mobile body 2 and a mobile-body-inside antenna 6b inside the mobile body 2, which are connected to each other. The mobile-body-outside antenna 6a wirelessly communicates with a mobile wireless terminal 3 inside the mobile body 2 and the mobile-body-inside antenna 6b connects to an antenna unit 11 of the wireless communication system 1, thereby configuring a wireless communication network. The mobile wireless terminal 3 is connected to a fixed access point 8b via the wireless communication system 1 and the wireless communication network, and communicates with an external wireless communication device 14 of the mobile body.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless communication system that enables wireless communication inside and outside the mobile body, and in particular, in a mobile body such as an elevator car with radio waves shielded, wireless communication that enables wireless communication between the inside and the outside of the mobile body can be connected. Regarding the system.

Passengers on a moving elevator can use the intercom on the operation panel inside the elevator car in the event of a trouble such as an earthquake, fire, or thunder, a mechanical failure of the elevator, or an emergency. Press the button or emergency button to contact the operator outside the elevator or the person confirming the emergency and take appropriate action. However, in an emergency that suddenly occurs, it may be difficult to calmly find and press the intercom button or emergency button, or there may be no person who confirms the emergency. In addition, since contact is made via an operator outside the elevator, it may not be possible to operate quickly. On the other hand, passengers on the elevator will be able to respond more quickly and directly if they can contact people outside the elevator using their own portable wireless terminals such as smartphones, which they are accustomed to using. In addition, passengers in the elevator car may want to contact an external contact immediately, not only when the elevator is out of order. In addition, passengers in the elevator car may search for information that they want to access the Internet in an emergency, and it is desirable that a portable wireless terminal such as a smartphone is always available.

However, as will be described later, "Even if you try to talk to an external operator or person with a portable wireless terminal owned by a passenger inside the elevator car, the radio waves are cut off because the upper and lower sides of the elevator car are surrounded by metal plates. Passengers in the car cannot communicate directly with external operators and related parties using mobile wireless terminals. Mobile wireless terminals such as smartphones are now a necessity for modern people and can be used anytime and anywhere. However, since it cannot be used when inside a moving body such as an elevator car, requests for improvement and improvement are being sent to affiliated companies from various fields.

The present invention applies the following wireless communication technology in the vertical direction such as a wave guide LAN system using a leakage waveguide and wireless backhaul network technology to perform wireless communication inside and outside a moving body such as an elevator car. It was made possible.

(Leaky coaxial cable LCX)
A "wireless communication system using a leaky coaxial cable (LCX)" that efficiently supplies radio waves to a building by a transmission cable has been put into practical use. The wireless communication system using this leaky coaxial cable is a transmission cable that is wired between at least one access point, a terminal portion, and the access point and the terminal portion, and transmits a radio wave signal to communicate with the device as an antenna. The transmission cable is configured by connecting a leaky coaxial cable that leaks radio waves and a non-leakage coaxial portion that does not leak radio waves via a different type of cable connecting portion. The leaky coaxial cable is a practical example of a leaky wave antenna required for the configuration of this communication system.

(Wireless backhaul network)
In addition, a wireless backhaul that can cooperate with each other by wireless communication instead of wired access points has been put into practical use. This technology enables wireless communication even in places that were previously difficult to install. Further, in this wireless communication, as long as a power source can be secured, LAN construction for expansion becomes unnecessary, so that it is possible to freely add access points and establish a stable wireless network in a wide area.

Patent Document 1 discloses an in-elevator mobile phone relay system capable of making a call from inside a car to a free party by a mobile phone when an elevator confinement failure occurs. Here, an intercom control device that transmits an abnormality notification signal, a failure detector that transmits a confinement failure signal, a Bluetooth master station that transmits call destination number information transmitted from a mobile phone via a control cable, and the public. It is equipped with an elevator monitoring device that switches to the network, makes a call to the call center or the other party via the public network, and sends and receives voice information. When the transmission and reception of voice information between the intercom and the call center is completed, connect the Bluetooth master station to the public network and call the other party based on the received call destination number information to carry with the other party. It describes sending and receiving voice information between telephones. In paragraph 0009 of Patent Document 2, as a problem to be solved by the invention, "... even when a passenger in the car tries to contact the outside by a mobile phone, the circumference of the elevator car is generally a metal plate. Since the metal plate blocks high frequencies, passengers in the car could not freely communicate with the outside using their mobile phones. "

Japanese Patent Application Laid-Open No. 2003-204398

Hereinafter, the problem of wireless communication in a conventional mobile body will be described with respect to the case of an "elevator car" as a specific example. The wireless communication system in the elevator car was capable of wireless communication across floors in buildings such as buildings. However, there is a problem that radio waves are greatly attenuated by wall materials on each floor of a building such as a building, and there is a problem that wireless communication becomes difficult in a space covered with walls on all sides. In particular, since the elevator shaft is covered with a sturdy concrete block, the attenuation of radio waves is extremely large. Further, in the elevator car, wireless communication is cut off by iron plates on all sides, and radio waves from the outside are reflected, so that wireless communication is extremely difficult.

Conventionally, an emergency telephone line or the like in an elevator car has been connected to an external public telephone line network by connecting the inside and outside of the elevator car with a wired cable. Therefore, this wired cable has a structure that expands and contracts when the elevator car moves up and down, and there is a risk of disconnection due to repeated expansion and contraction, and a risk of failure such as disconnection from the connector.

On the other hand, a communication method using a directional antenna in the elevator shaft has also been proposed. Antennas are installed at the upper and lower opposite positions in the elevator shaft, and wireless communication is performed between the upper and lower floors. However, although this directional antenna is useful in a "line-of-sight environment", the elevator shaft is a closed space, and radio waves are diffusely reflected in the elevator shaft before forming a highly directional beam, causing radio waves in the vertical direction. Was not propagated and there was a risk that it would not reach the upper floors. Further, when the elevator car that goes up and down moves between the upper and lower antennas, the radio wave is reflected by the iron plate of the elevator car, so that there is a problem that the radio wave does not reach the floor above it.

In addition, since the wireless communication to the inside of the elevator car is cut off, the wireless communication to the robot such as the automatic guided vehicle (AGV) for transporting the construction materials and the like is interrupted inside the elevator car. If the inside and outside of the elevator car are connected by a communication network, the information from the cameras and sensors inside the mobile body can be converted to the cloud, and remote control of the robot becomes possible, but the essential wireless communication is inside the mobile body. There was a problem that cloud computing and robotization did not progress because it was cut off.

In addition, at the construction site, in order to safely and efficiently transport construction materials and construction workers by temporary elevators, workers stationed in the elevator car talk to workers on each floor by wire telephone and stop the elevator. Although the floors and transportation contents are being adjusted, securing workers has become a problem due to the aging of workers and the increase in foreign workers due to labor shortages.

In addition, in hospital facilities, it is necessary to constantly measure the inpatient's vital monitor, but while the inpatient is in the elevator car, wireless communication is cut off by a moving object, and the inpatient's vital monitor cannot be measured. The problem of becoming occurred. In hotels, etc., wireless communication into the elevator car enables quick and advanced service to customers, but there is a problem that the quality of service cannot be ensured because the wireless communication is cut off by the elevator car. rice field.

In this way, the problem that wireless communication between the inside and the outside is cut off because the upper and lower sides of the elevator car are covered with metal is not limited to the elevator car, but the movement of automobiles, buses, trucks, subways, etc. Similar problems occur in the body. In addition, this problem is not limited to buildings such as offices, factories, hospitals, and commercial facilities where construction work has been completed, but similar problems occur in temporary elevators installed at construction sites for construction and civil engineering.

An object of the present application is to solve such a problem and to provide a wireless communication system capable of easily wirelessly communicating with the outside of a mobile body by a portable wireless terminal such as a smartphone or a tablet from the inside of the mobile body in which radio waves are shielded.

In order to achieve the above object, in the wireless communication system according to the present invention, a mobile access point provided with an antenna outside the mobile body and an antenna inside the mobile body connected to each other is provided on the mobile body in which radio communication is shielded. A vertical wireless communication system is provided in the traveling path of the mobile body, the antenna inside the mobile body wirelessly communicates with the portable wireless terminal inside the mobile body, and the antenna outside the mobile body is the antenna of the wireless communication system. A wireless communication network is configured by connecting to a unit, and the portable wireless terminal is characterized by being connected to a fixed access point and communicating with a wireless communication device outside the mobile body via a wireless communication system and a wireless communication network. do.

With the above configuration, the wireless communication system enables communication inside and outside the mobile body in which radio wave communication is shielded. If wireless communication inside and outside the mobile body is free, the passengers on the mobile body can talk from the inside of the mobile body to the outside of the mobile body by using a portable wireless terminal such as a smartphone or tablet that they own. can. As a result, it is possible to immediately communicate inside and outside the moving body, such as when an emergency occurs inside the moving body, when a disaster such as a fire occurs in the moving body, or when a user in the moving body is warned of the occurrence of an earthquake. It becomes. Further, for example, when this wireless communication system is used at a construction site, transportation management by a portable wireless terminal for workers and construction materials becomes simpler. Further, for example, when the wireless communication system is used in a hospital, the patient's vitals can be constantly measured even when the patient is in a moving body.

In addition, the mobile access point is provided outside the mobile body, an antenna inside the mobile body is installed from the mobile access point toward the mobile wireless terminal, and wireless communication is performed with the mobile wireless terminal owned by a passenger inside the mobile body. It is preferable that the feature is. As a result, radio waves transmitted from the portable wireless terminal inside the mobile body can be easily transmitted and received by the antenna inside the mobile body provided in the mobile access point.

Further, it is preferable that antennas outside the mobile body are installed from the mobile access point toward the antenna portion of the wireless communication system, and the antennas are in a positional relationship facing each other, so that wireless communication is performed with the external wireless communication device of the mobile body. As a result, transmission / reception can be performed from the mobile access point to a wireless communication device outside the mobile body.

Further, the antenna inside the mobile body that communicates with the mobile wireless terminal and the antenna outside the mobile body that communicates with the antenna portion of the wireless communication system are connected by a coaxial cable inside the mobile access point, and the coaxial cable is a radio wave to the mobile body. It is preferable to communicate through a shield that shields the antenna. As a result, the above-mentioned problem that wireless communication between the inside and the outside is cut off because the upper and lower sides of the moving body are covered with metal is that the antenna inside the moving body and the antenna outside the moving body inside the access point. By the method of connecting with a coaxial cable, it can be achieved easily and without impairing the communication performance.

Further, it is preferable that the moving body is an elevator car installed in a building, the traveling path on which the moving body moves is an elevator shaft on which the elevator car moves up and down, and the moving access point is an elevator access point.

Further, it is preferable that the antenna of the elevator access point and the antenna portion of the wireless communication system communicate with each other by a wireless backhaul. A stable communication environment can be constructed by this wireless backhaul network.

Further, it is preferable that a plurality of elevator access points are installed inside the elevator shaft to form a wireless communication network with each other. A stable communication environment can be constructed by this formed communication network.

Further, it is preferable that both the backhaul radio wave and the wireless LAN radio wave are output to the antenna portion of the wireless communication system. In this way, the wave guide of the wave guide LAN system can leak radio waves by a waveguide, and the leaked radio waves are output for both the backhole radio wave and the wireless LAN radio wave, so that a stable wireless back is achieved. Hall communication is possible.

Further, it is preferable that the elevator access point constitutes a wireless communication network with an antenna unit in the line-of-sight environment among the wireless communication systems in the line-of-sight environment. As a result, the elevator access point can reliably communicate with the external wireless communication device of the elevator shaft via the antenna portion of the wireless communication system.

Further, it is preferable that the elevator access point installed in the elevator shaft can communicate with the portable wireless terminal of the passenger in the elevator hall on the floor where the elevator is installed. This makes it possible to prioritize calls with passengers in the elevator hall on the floor where the elevator access point, which requires contact with the elevator car, is installed in an emergency.

Further, in the wave guide LAN system, it is preferable to use a metal pipe used in the field as a waveguide, attach a flange to the end of the metal pipe, and join them to each other with bolts. As described above, in the wave guide LAN system which is one embodiment of the wireless communication system, a single pipe used for scaffolding or the like at a construction site is used as a waveguide. This has the advantages that the waveguide can be easily procured at the construction site, the single pipe can be easily assembled and disassembled, and can be freely diverted to other construction sites.

As described above, according to the wireless communication system according to the present invention, there is provided a wireless communication system that easily communicates wirelessly from the inside of a mobile body in which radio waves are shielded to the outside of the mobile body by a portable wireless terminal such as a smartphone or tablet. can.

It is sectional drawing which shows the schematic structure of one Embodiment of the wireless communication system which concerns on this invention. FIG. 3 is a detailed cross-sectional view showing a schematic configuration of a wave guide LAN system, which is an embodiment of the wireless communication system of FIG. 1. The outline of the wave guide LAN system which is an example of the wireless communication system is shown in the partial detailed view, and the outline of the radio wave leakage cable is shown in the exploded detailed view. It is a block diagram which shows the structure of the wireless communication system of FIG. It is explanatory drawing which shows the wireless backhaul communication network which comprises the antenna outside the moving body, and the antenna part provided in the elevator shaft when the elevator is stopped on the Nth floor. An embodiment of an access point antenna for a wireless backhaul communication network is shown. It is explanatory drawing about the structure of the wireless backhaul communication network using the access point of FIG. It is explanatory drawing about the structure of the conventional wired communication network. It is explanatory drawing which shows the outline of the demonstration experiment which carried out in the field about the wireless communication system which concerns on this invention. It is explanatory drawing which shows the result of the demonstration experiment which carried out in the field about a wireless communication system.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system 1 according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a schematic configuration of one embodiment of the wireless communication system 1 according to the present invention in a cross-sectional view. FIG. 2 shows a schematic configuration of the wave guide LAN system 10 in the wireless communication system 1 of FIG. 1 in a detailed cross-sectional view. In this specification, as an embodiment of the wireless communication system 1, a case where the mobile body 2 is an elevator car 2 for moving up and down a building will be described.

In the wireless communication system 1, specifically, the moving body 2 is an elevator car 2 installed in a building, and the traveling path 5 on which the moving body 2 moves is an elevator shaft 5 in which the elevator car 2 moves up and down. The access point 8a is an elevator access point 8a.

In the wireless communication system 1, the antenna 6a outside the mobile body and the antenna 6b inside the mobile body are interconnected with respect to the mobile body 2 whose upper and lower sides are covered with concrete, iron plates, or the like to shield radio communication. A mobile access point 8a is provided, and a wave guide LAN system 10 in which a waveguide 12 and an antenna portion 11 of the mobile body 2 are connected is provided in a traveling path 5 of the mobile body 2, and an antenna in the mobile body is provided. 6b wirelessly communicates with the portable wireless terminal 3 inside the mobile body 2, the antenna 6a outside the mobile body constitutes a wireless network with the antenna portions 11 of the plurality of mobile bodies 2, and the portable wireless terminal 3 is a wireless communication network. It is an invention that it is connected to the fixed access point 8b via the above and communicates with the external wireless communication device 14 of the mobile body 2.

The wireless communication system 1 is represented by a specific step using FIG. 1. A smartphone possessed by a passenger or the like regarding an elevator car 2 that raises or DOWNs in the elevator shaft 5 of a building in the elevator elevating direction. 3 communicates with the antenna 6b in the moving body provided in the elevator access point 8a provided outside the elevator car 2 (step 1). The antenna 6b inside the moving body is connected to the antenna 6a outside the moving body also provided at the elevator access point 8a via the access point coaxial cable 9a (see FIG. 2) (step 2). The antenna 6a outside the moving body of the elevator access point 8a and the plurality of antenna portions 11 of the wave guide LAN system 10 installed in the elevator shaft 5 are connected by the wireless backhaul communication network 7 (step 3). In FIG. 1, the wireless communication system 1 communicates with the external wireless communication device 14 from the wave guide access point 8b connected to the lower end of the wave guide 12 (step 4). The access point provided in the moving elevator car 2 is referred to as a "moving access point 8a", and the access point connected to a plurality of antenna portions 11 fixed in the elevator shaft 5 is referred to as a "fixed access point 8b". Is also good. The mobile access point 8a may be specifically referred to as an "elevator access point 8a", and the fixed access point 8b may be specifically referred to as a "wave guide access point 8b". As a result, it can be clearly understood that the moving mobile access point 8a and the fixed fixed access point 8b communicate with each other via the antenna unit 11. Further, the position of the fixed access point 8b shown in FIG. 2 is not limited to the tip of the wave guide coaxial cable 9b at the lower end of the wave guide 12, and may be any position of the wave guide 12. Hereinafter, the wave guide LAN system 10, which is a feature of the present invention, will be described in detail.

(Wave guide LAN system)
FIG. 1 shows a cross-sectional view of the top floor, N + 1 floor, N floor, N-1 floor, and basement floor around the elevator car 2 of the building. In the elevator shaft 5, a hoisting machine 41 of the elevator car 2, a control panel (motor) 42, a hoisting machine pedestal 43 for the elevator, and the like are installed. As a recent trend, there are many cases where a machine room is not provided except for a large elevator. In addition, renovations of buildings often do not require a machine room. The elevator car 2 shall move up and down in the elevator shaft 5 by moving the counterweight 48 up and down, and stop at each of the top floor, N + 1 floor, N floor, N-1 floor, and basement floor. A landing 45 and an elevator door 47 are provided on the N + 1 floor, the N floor, and the N-1 floor, and passengers, construction materials, and the like get on and off the elevator car 2. The wave guide LAN system 10 is a vertical wireless LAN system of a building such as a building, and in the present embodiment, the wave guide LAN system 10 is from the top floor to the bottom floor from the basement floor to the outside of the elevator shaft 5. Wireless communication is performed using the wireless communication system 1 installed vertically up to the provided fixed access point 8b and installed on the elevator shaft 5 which is a passage provided in the vertical direction.

(Elevator access point)
An elevator access point 8a is provided outside the elevator car 2. An antenna 6b in the moving body is installed inward from the elevator access point 8a toward the portable wireless terminal 3 in the elevator car 2, and wirelessly communicates with the portable wireless terminal 3 in the elevator car 2. As a result, the radio wave transmitted from the portable wireless terminal 3 in the elevator car 2 can be easily transmitted to and received from the antenna 6b in the moving body provided in the elevator access point 8a.

An antenna 6a outside the moving body is installed outside the elevator car 2 from the elevator access point 8a toward the antenna portion 11 of the wave guide LAN system 10 and wirelessly communicates with the external wireless communication device 14 of the elevator car 2. Can be done. As a result, transmission / reception can be performed from the elevator access point 8a to the fixed access point 8b outside the elevator car 2.

As shown in FIG. 2, the inward moving antenna 6b communicating with the smartphone 3 in the elevator car 2 and the outward moving outside antenna 6a communicating with the antenna portion 11 of the wave guide 12 are connected to the elevator. It is connected by an access point coaxial cable 9a in the point 8a. The access point coaxial cable 9a communicates through the outer wall or ceiling of the shielded elevator car 2. That is, the problem that wireless communication between the inside and the outside is cut off because the upper and lower sides of the elevator car 2 are covered with metal is that the antenna 6a outside the moving body and the antenna 6b inside the moving body at the elevator access point 8a. This can be achieved without impairing the communication performance by partially adopting the wave guide coaxial cable 9b as a part of the wireless cable. Further, although the wave guide coaxial cable 9b is a wired cable 40, since it is used for an extremely short distance, the elevator is not affected by the raising and lowering of the elevator 2, and no slack occurs, so that there is no risk of disconnection or the like. The elevator door 47 of the elevator car 2 opens at each stop floor, but wireless communication between the antenna 6b inside the moving body and the smartphone 3 or wireless communication between the antenna 6a outside the moving body and the antenna unit 11 is directly performed by the elevator. Do not go through the door 47.

As shown in FIGS. 1 and 2, a plurality of elevator access points 8a are installed in the elevator shaft 5, and form a communication network with each other to perform wireless communication. This is because the inside of the elevator shaft 5 is a complicated space, and there is no wireless communication in the so-called "line-of-sight environment" due to the elevator car 2, equipment, elevating equipment, and the like. Therefore, the elevator access point 8a moving in the elevator shaft 5 is covered by the wireless backhaul communication network 7 so that the antenna unit 11 can reliably receive the radio wave. A stable communication environment can be constructed by the formed wireless backhaul communication network 7.

Further, as shown in FIG. 2, since the elevator access point 8a is installed outside the elevator car 2, it is possible to wirelessly communicate with the antenna portion 11 of the wave guide 12 in the line-of-sight environment from the elevator access point 8a. On the other hand, there is a possibility that wireless communication with the antenna portion 11 of the wave guide 12 in which the elevator access point 8a is below the elevator car 2 is cut off by the elevator car 2 in particular. By installing the elevator access point 8a outside the elevator car 2 in this way, it is possible to reliably communicate with the antenna portion 11 in the elevator shaft 5 from the elevator access point 8a.

(Wave guide LAN system and radio wave leakage cable)
FIG. 3 shows an outline of the embodiment of the wave guide LAN system 10 in a partial detailed view, and shows an outline of the leaky coaxial cable (LCX) 20 in an exploded detailed view. FIG. 3A shows the wave guide LAN system 10 as a partial detailed view. In the wave guide LAN system 10, the wave guide 12 and the antenna portion 11 are connected to each other. The antenna unit 11 is provided with a radio wave leakage unit 23 to emit radio waves. The wave guide 12 is surrounded by a metal pipe 17 that transmits radio waves internally and does not leak radio waves to the outside. The coaxial inner conductor 16 of the wave guide 12 is connected to the fixed access point 8b. FIG. 3B shows the leaky coaxial cable 20 in an exploded detailed view. In the leaky coaxial cable 20 of the antenna portion 11 shown in FIG. 3B, the coaxial inner conductor 16 is surrounded by the dielectric 18 and further covered by the outer conductor 19. Then, the outer conductor 19 is provided with a slit portion 15 which is a notch, and the radio wave propagating inside leaks from the slit portion 15. Therefore, the slit portion 15 becomes the radio wave leakage portion 23 of the wave guide 12. The notch in the slit portion 15 is cut diagonally with respect to the axial direction of the leaky coaxial cable 20 so that radio waves are easily leaked.

On the other hand, the wave guide 12 is referred to as a waveguide 12. In the present embodiment, the wave guide 12 uses a metal pipe 17, and a single pipe or the like, which is often used for scaffolding in on-site temporary construction, is diverted. That is, the metal pipe 17 is cut to a predetermined length, and a flange joint is attached to the end thereof. Then, the metal pipes 17 are bolted together by a flange joint. The lower end of the wave guide 12 is connected to the wave guide access point 8b by the coaxial inner conductor 16. As described above, the wave guide 12 can be easily procured at the construction site when a single pipe is used as the metal pipe 17. In addition, this single pipe can be easily assembled and disassembled, and has merits such as being able to be freely diverted to other construction sites.

(Wireless backhaul)
As described above, the antenna 6a outside the mobile body of the elevator access point 8a and the antenna portions 11a to 11y of the wave guide LAN system 10 wirelessly communicate with each other by the wireless backhaul communication network 7. As a result, a more stable communication environment between the access point antenna 31, the downstream side antenna 32, and the upstream side antenna 33 can be constructed. The antenna portions 11a to 11y of the wave guide LAN system 10 are connected via the wave guide 12, and both the backhaul radio wave and the wireless LAN radio wave are output in the wave guide 12. As a result, the wave guide 12 can leak radio waves from the slit portion 15, and the radio waves are output from both the backhaul radio wave and the wireless LAN radio wave, so that stable wireless backhaul communication is possible. Become.

(Block configuration of wireless communication system)
FIG. 4 shows the configuration of the wireless communication system 1 of FIG. 1 in a block diagram. Passengers in the elevator car 2 can wirelessly use their smartphones 3a to 3x to wirelessly elevator in the event of an earthquake, fire, emergency, or elevator stoppage. It is possible to make a call with the external wireless communication device 14 of the car 2. Alternatively, in an emergency, you can contact the hospital, fire department, police station, elevator management company, home, your company, etc. directly.

The information transmitted from the smartphones 3a to 3x in the elevator car 2 is connected to the antenna 6b in the moving body provided in the elevator access point 8a provided outside the elevator car 2. The information connected to the elevator access point 8a is connected to the antenna portion 11 in the elevator access point 8a via the access point coaxial cable 9a. Then, it is transmitted from the antenna 6a outside the moving body provided in the elevator access point 8a to the antenna portions 11a to 11y of the wave guide LAN system 10 provided in the elevator shaft 5. The information transmitted to the antenna units 11a to 11y reaches the fixed access point 8b via the waveguides 12a to 12y, and reaches the external wireless communication device 14. In the wave guide LAN system 10, the antenna 6a outside the mobile body and the antenna portions 11a to 11y on each floor form a wireless backhaul communication network 7.

(Wireless backhaul network)
FIG. 5 is an explanatory diagram of a wireless backhaul communication network 7 composed of an antenna 6a outside the moving body when the elevator is stopped on the Nth floor and antenna portions 11a to 11y provided in the elevator shaft 5. show. The inside of the elevator shaft 5 is originally a complicated space, and it is assumed that there is no wireless communication in the so-called "line-of-sight environment" due to the elevator car 2, equipment, elevating equipment, and the like. Therefore, the wireless communication backhaul network 7 is configured so that the antenna units 11a to 11y reliably receive the radio waves with respect to the elevator access points 8a moving in the elevator shaft 5. Further, since the elevator car 2 that moves up and down in the elevator shaft 5 is covered on all sides with an iron plate, concrete, or the like, it shields radio waves. Therefore, as shown in FIG. 5, the antenna 6a outside the moving body is installed outside the elevator car and communicates with the fixed access point 8b below the elevator car 2.

For example, when the elevator car 2 shown in FIG. 5 is stopped at the Nth floor (elevator car 2 shown by a solid line in FIG. 5) in the elevator shaft 5, antenna portions 11b, 11a, 11c, etc. in the vicinity of the Nth floor, etc. Wireless communication with. At this time, the radio wave is interrupted to the antenna portion 11c due to being shielded by the elevator car 2, etc., but the radio wave reaches the antenna portions 11b and 11a, so that the wireless backhaul communication network 7 becomes possible. In this way, even if the elevator car 2 moves up and down in the elevator shaft 5, the wireless backhaul communication network 7 is covered with wireless communication by the position of the elevator car 2. As a result, the radio wave transmitted from the portable wireless terminal 3 in the elevator car 2 can be relayed to the wave guide access point 8b.

FIG. 6 shows an embodiment of an access point antenna 31 constituting the wireless backhaul access point 8c of the wireless backhaul communication network 7. In the conventional wireless communication technique, when the elevator access point 8a is connected wirelessly, the throughput gradually decreases, and there is a problem that the wireless communication speed does not come out when passing through a plurality of places. The wireless backhaul antenna 6c for the elevator access point 8a used in the present invention enables wireless communication at a distance of several hundred meters at the maximum.

FIG. 7 is an explanatory diagram showing an embodiment relating to the configuration of the wireless backhaul communication network 7 using the wireless backhaul access point 8c of FIG. As described above, the wireless backhaul communication network 7 is a wireless device for dealing with a case where the inside of the elevator shaft 5 is a complicated space and the wireless communication is not in the so-called "line-of-sight environment" due to the elevator car 2, equipment, elevating device, or the like. It is a communication method. As shown in FIG. 7, the access point antennas 31a to 31z each form a wireless backhaul communication network 7 by the wireless backhaul antenna 6c and perform wireless communication with each other. In the wireless backhaul communication network 7, the wireless communication between the access point antenna 31b and the access point antenna 31c is blocked by the shield 34. At this time, wireless communication can be performed by detouring from the access point antenna 31b to the access point antenna 31c via the access point antenna 31d. In this way, the wireless backhaul communication network 7 allows the wireless backhaul antenna 6c of each antenna unit 11 to reliably receive radio waves to the elevator access point 8a moving in the elevator shaft 5. A stable communication environment can be constructed by the formed wireless backhaul communication network 7.

FIG. 8 shows an explanatory diagram of the configuration of the conventional wired communication network 7b. Each wired access point 8d is connected to the network switch 30 by a wired cable 40.

(Outline of demonstration experiment of wireless communication system)
FIG. 9 shows an outline of a demonstration experiment conducted at a construction site for the wireless communication system 1 according to the present invention with an explanatory diagram. The evaluation pattern A and the evaluation pattern B of the wireless communication system 1 were attached to the elevator car 2 installed in the elevator shaft 5, and the received power intensity (RSSI) of the wireless LAN radio wave was measured. 9 (a) is the case of the evaluation pattern A of the conventional wireless communication system, and FIG. 9 (b) is the case of the evaluation pattern B of the present wireless communication system 1. The evaluation pattern A is a demonstration experiment in which passengers inside the elevator car 2 communicate directly with the outside of the elevator car 2 by the smartphone 3. That is, the received power intensity (RSSI) of the wireless LAN radio wave at the elevator access point 8a was measured without installing the antenna 6a outside the moving body and the antenna 6b inside the moving body. Here, in the wave guide LAN system 10, the wave guide access points 8b on each floor are connected by the wave guides 12a to 12d, and are connected to the fixed access points 8b at the lower end portion via the wave guide coaxial cable 9b.

On the other hand, the evaluation pattern B is an evaluation pattern of the wireless communication system 1 according to the present invention. That is, the radio wave of the wireless backhaul communication network 7 is radiated from the wave guide LAN system 10 and connected to the antenna 6a outside the mobile body of the mobile access point 8a installed outside the elevator car 2. In addition, wireless LAN radio waves are radiated from the antenna 6b in the moving body installed in the elevator car 2 to communicate with the smartphone 3 in the elevator car 2. Here, in the wave guide LAN system 10 of the evaluation pattern B, the wave guide access points 8b on each floor are connected by the wave guides 12a to 12d as in the case of the evaluation pattern A, and the wave guide coaxial cable 9b is passed through the lower end portion. It is connected to the fixed access point 8b.

(Results of demonstration experiment of wireless communication system)
FIG. 10 shows an explanatory diagram of the evaluation results of a demonstration experiment conducted at a construction site for the wireless communication system 1 according to the present invention. The unit of the evaluation result is dBm. FIG. 10 shows the received power intensity (RSSI) of the wireless LAN radio wave received by the evaluation terminal (PC) on the elevator stop floors from the 1st floor to the 7th floor in a table for the evaluation pattern A and the evaluation pattern B, respectively. When the received power strength (RSSI) is less than -75 dBm, large-capacity communication such as moving images is interrupted, but in pattern A, it is less than -75 dBm on all floors except the first floor. On the other hand, in the evaluation pattern B, stable evaluation results were obtained on each floor, the wireless communication system 1 according to the present invention was feasible, and the usefulness of the wireless communication system 1 was demonstrated.

The configuration, shape, size, and arrangement relationship described in the above-described embodiment of the wireless communication system 1 are merely schematically shown to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiment, and can be changed to various embodiments as long as it does not deviate from the scope of the technical idea shown in the claims.

1 wireless communication system, 2 mobile or elevator car, 3,3a to 3x portable wireless terminal, or smartphone, 5 track or elevator shaft, 6a extra-mobile antenna, 6b in-mobile antenna, 6c wireless backhaul antenna, 7 Wireless backhaul communication network, 7b Wired communication network, 8a Mobile access point or elevator access point, 8b Fixed access point or Wave guide (coaxial tube) access point, 8c Wireless backhaul access point, 8d Wired access point, 9a access Point coaxial cable, 9b wave guide coaxial cable, 10 wave guide LAN system, 11, 11a to 11y antenna section, 12, 12a to 12y waveguide or wave guide, 14 external wireless communication device, 15 slit section, 16 coaxial inner conductor , 17 metal pipes, 18 dielectrics, 19 external conductors, 20 leaky coaxial cables, 21 coatings, 22 sockets, 23 radio leaks (of waveguide antennas), 30 network switches, 31, 31a-31z access point antennas. , 32, 32a-32z Down Stream side antenna, 33, 33a-33z Up Stream side antenna, 34 shield, 40 wired cable, 41 hoist, 42 control panel (motor), 43 hoist cradle, 44 air conditioner, 45 platform, 47 elevator doors, 48 counter weights.

Claims (11)

A mobile access point equipped with an antenna outside the mobile body and an antenna inside the mobile body connected to each other is provided on the mobile body in which radio wave communication is shielded.
A vertical wireless communication system is provided on the traveling path of the mobile body.
The antenna in the mobile body wirelessly communicates with the portable wireless terminal inside the mobile body.
The antenna outside the mobile body constitutes a wireless communication network by connecting to the antenna portion of the wireless communication system.
The portable wireless terminal is a wireless communication system that is connected to a fixed access point via the wireless communication system and the wireless communication network and communicates with an external wireless communication device of the mobile body. The wireless communication system according to claim 1, wherein the mobile access point is provided outside the mobile body, and an antenna inside the mobile body is installed from the mobile access point toward the portable wireless terminal. A wireless communication system characterized by wireless communication with the portable wireless terminal possessed by a passenger inside the mobile body. The wireless communication system according to claim 1 or 2, wherein antennas outside the mobile body are installed from the mobile access point toward the antenna portion of the wireless communication system, and the antennas are located at opposite positions. A wireless communication system characterized by wireless communication with the external wireless communication device of a mobile body. The wireless communication system according to any one of claims 1 to 3, wherein the antenna in the mobile body communicating with the portable wireless terminal and the antenna portion in the mobile body communicating with the antenna portion of the wireless communication system are outside the mobile body. An antenna is a wireless communication system that is connected by a coaxial cable inside a mobile access point, and the coaxial cable communicates through a shield that shields radio waves to the mobile body. The wireless communication system according to any one of claims 1 to 4, wherein the moving body is an elevator car installed in a building, and the elevator car moves up and down in a traveling path on which the moving body moves. A wireless communication system that is an elevator shaft, wherein the mobile access point is an elevator access point. The wireless communication system according to any one of claims 1 to 5, wherein the antenna of the elevator access point and the antenna unit of the wireless communication system communicate with each other by a wireless backhaul. Communications system. The wireless communication system according to any one of claims 1 to 6, wherein a plurality of elevator access points are installed inside the elevator shaft to form the wireless communication network with each other. system. The wireless communication system according to claim 7, wherein both a backhaul radio wave and a wireless LAN radio wave are output to the antenna portion of the wireless communication system. The wireless communication system according to claim 7 or 8, wherein the elevator access point constitutes the wireless communication network with an antenna unit in the line-of-sight environment among the wireless communication systems in the line-of-sight environment. system. The wireless communication system according to any one of claims 7 to 9, wherein the elevator access point installed in the elevator shaft can communicate with the portable wireless terminal of a passenger in the elevator hall on the floor where the elevator access point is installed. A wireless communication system characterized by being. The wireless communication system according to any one of claims 7 to 10, wherein the vertical system wireless communication system uses a metal pipe used in the field as a waveguide and is attached to an end portion of the metal pipe. A wireless communication system characterized by attaching flanges and joining them together with bolts.

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