JP6748049B2 - Base station device and wireless communication system - Google Patents

Description

The present invention relates to a base station device and a wireless communication system.

Currently, high-performance mobile communication terminals such as smartphones have been explosively popularized. Regarding mobile phones, the third-generation mobile communication has shifted to the fourth-generation mobile communication, and now, further research and development on the fifth-generation mobile communication (commonly referred to as "5G") are underway. One of the studies conducted on this 5G is the use of macro cells and small cells.

In the conventional mobile phones, one service area is set to a radius of several kilometers, and one base station device covers this macrocell area. However, a very large number of users exist in such a macro cell. Since the entire limited system capacity is shared by each user, when accommodating a huge number of users, the throughput for each individual user decreases.

In order to avoid such a decrease in throughput, a technology has been developed for setting a small cell, which is a very small service area with a radius of several tens of meters, in a densely populated area where traffic is concentrated. This technology utilizes small cells to offload spot-like traffic to the network without going through macro cells. Here, it is assumed that the terminal device is capable of simultaneously using the communication capability of the small cell and the communication capability of the macro cell. By using such a terminal device, the user data is accommodated on the small cell side while exchanging the control information by utilizing the macro cell. This makes it possible to maximize the advantages of the macro cell and the small cell.

In 5G mentioned above, the target value of the transmission rate is set to 10 Gbit/s (Gigabit per second) or more, and even in this small cell, the same large capacity communication is performed to realize efficient offload of traffic. There is a need to. In the macro cell, it is premised that the microwave band of low frequency is used to allow long-distance propagation. However, considering the current state of the microwave band, where frequency resources are already exhausted, small cells that are supposed to communicate at relatively short distances are expected to use the quasi-millimeter wave band or millimeter wave band with relatively high frequencies. Has been done. The characteristic of this high frequency band is that the propagation attenuation increases in inverse proportion to the square of the frequency. Therefore, the small cell base station is installed relatively close to the user terminal.

It is assumed that such a small cell base station is installed in a relatively high place such as a building wall or a streetlight in a busy area such as Shibuya or Shinjuku where many people gather. If a large number of small cell base stations are installed, users can be efficiently accommodated by being divided into smaller areas, and thus the offload effect is high. Many of these downtowns are pedestrians. Since the use of smartphones and the like is restricted while moving by walking, the number of users who perform communication is limited to a part of pedestrians and the like. On the other hand, in places such as stadiums and trade fairs, there is a strong need for communication, and moreover, many people are in a semi-static state. Therefore, the substantial number of users or the user density becomes very high.

As an example of wireless access in a stadium, a Wi-Fi (registered trademark) service is provided at Seibu Dome in Saitama. Here, a directional antenna is attached to a plurality of wireless LAN access points. Then, the service area divided for each directivity is frequency-divided by a plurality of frequency channels, and the service is provided by covering the audience seats in a two-dimensional manner. This service is different from the service aiming for 5G as described above, and is also a service using the current commercially available system. From this, the individual service areas separated by the directional antenna were set relatively wide, and it was possible to deal with relatively rough area design while allowing overlap between mutual service areas. .. Therefore, this access point is installed on a wall near the uppermost stage of the spectator seats of the stadium, etc., and at a high place (for example, 3 to 4 m) so that a pedestrian nearby does not block the view of the service area. It was good if it was installed in (about). At present, applications that actively use communication services in stadiums are not widespread, and Internet browsing is the main condition.

However, in the age of 5G, it is expected that the transmission capacity demanded by each user will increase and that many applications used in stadiums will be developed. For example, replay videos of sports such as soccer and baseball, and views from different directions may be arbitrarily used. When viewing these on-demand for each user, it is necessary to divide the stand of the stadium into small small cells or pico cells and expand each pico cell in a service area while performing frequency segregation.

In order to divide such a pico cell with a directional antenna, it is not possible to install it on a wall surface near the uppermost stage of the spectator seats of a stadium, like the service of the Seibu Dome mentioned above. This is because the angle difference between the direction of the lowermost stage of the spectator seats and the direction of the uppermost spectator seats is relatively narrow when viewed from the access point installed on the wall near the uppermost stage of the stadium seats, and the directivity of the antenna This is because it is difficult to secure sufficient resolution to separate service areas. Furthermore, the user faces the ground side of the stadium, and it is expected that he/she will almost certainly be out of sight with respect to the access point located in the back direction. Even if the wireless LAN uses a low frequency microwave band, it is impossible to design a clean pico cell such as a line-of-sight environment under the environment where the human body is shielded. Further, when a high frequency band such as a millimeter wave is used, it is not possible to expect radio waves to wrap around due to diffraction, and the line margin due to human body shielding becomes 10 dB or more, which is disadvantageous in line design.

As another viewpoint, application of Massive MIMO technology using a super-multi-element antenna is being considered in a 5G small cell base station. In the Massive MIMO technology, a large number of antenna elements are mounted on both the base station apparatus and the terminal station apparatus, and the directivity is formed by mutually utilizing the antenna elements to secure the directivity gain, thereby improving the signal-to-interference and noise power. It is possible to improve the ratio SINR (Signal to Interference and Noise Ratio) and suppress pre-interference between adjacent service areas to perform parallel transmission. The directivity control using these many antenna elements enables a small cell or pico cell type service that finely divides a service area.

However, when forming this beam, instead of installing it on the wall near the top of the spectator seats of the stadium as in the Seibu Dome example above, ensure the visibility of the entire service area, and It is preferable to install in an environment where a wide azimuth difference such as elevation angle and horizontal angle can be secured. Specifically, it is preferably installed near the ceiling above the audience seats. In fact, if you take a dome stadium or the New Tokyo International Stadium as an example, many of them have a roof above the seats of the audience, and base station equipment and access points should be installed on the structure of such a roof. Is possible. This is also the case, for example, indoors such as at a trade fair, and ideally it is ideal to install the base station device at a high place such as the ceiling and illuminate the area below.

This is also beneficial from the perspective of Massive MIMO technology. For example, according to Non-Patent Document 1, from the viewpoint of utilizing the spatial degree of freedom of the Massive MIMO technology, it is possible to effectively utilize the spatial degree of freedom by irradiating from above rather than irradiating from the horizontal direction. It has been shown to be effective in terms of multiplexing and securing SINR. A more detailed situation will be described with reference to FIGS. 4 and 5.

FIG. 4 is a diagram showing an environment in which a base station device is installed in a relatively low place and emits a beam from a horizontal direction, and FIG. 5 is a case where a base station device is installed in a high place and emits a beam from above. It is a figure which shows the environment of. In these drawings, 1-a to 1-g are small cells (or pico cells) in the service area, 2-a to 2-g are terminal stations, 3 and 4 are Massive MIMO base stations, and 5 is a human body. There is.

For example, when attention is paid to the small cells 1-g, 1-a, and 1-d in FIG. 4, the small cells 1-g, 1-a, and 1-d are substantially linear when viewed from the Massive MIMO base station 3. Are lined up. Therefore, when the communication between the terminal stations 2-g, 2-a, and 2-d in each of the small cells 1-g, 1-a, and 1-d is attempted to be separated by the directivity control, the elevation angle is increased. Although signal separation must be performed based on the angle difference between the directions, the environment is originally close to the horizontal direction and the difference in elevation angle is unlikely to occur, so that it is difficult to separate users by directivity control. Furthermore, considering the shielding by the human body 5, for example, in the service to the distant small cells 1-d and 1-a, the line gain is reduced due to the human body shielding, and the reflected wave is positively used. Therefore, the time variation of the channel also becomes large.

On the other hand, in the case of irradiating the beam from above as shown in FIG. 5, the angle difference between the horizontal direction and the elevation angle direction is evenly present, which facilitates signal separation between the small cells by directivity control. Further, the power of the direct wave component is relatively higher than that of the reflected wave component, and the time variation of the channel is also relatively low. Since it is almost outlook, it is not easily affected by the human body 5, and the line gain advantage is also high. Of course, there is a possibility that the propagation distance may be lengthened by installing it at a high place, but in consideration of the fact that the farthest small cells 1-d and the like have a reasonable distance in FIG. The degree of environmental disadvantage of 5 is limited.

As shown in Non-Patent Document 1, for example, when the number of antenna elements of the Massive MIMO base stations 3 and 4 is 100, apparently a channel vector with each antenna of the terminal stations 2-a to 2-g. Exists in 100-dimensional space. However, in reality, an arbitrary subspace cannot be used in the complete 100-dimensional space, and channel vectors exist predominantly in some subspace (for example, 50-dimensional subspace). The wider the effective width of this subspace, the more the channel correlation can be reduced, which is suitable for spatial multiplex transmission. However, the effective width of this subspace (or the effective subspace Dimension) becomes wider when the beam is emitted from above as shown in FIG.

Combining these viewpoints, in wireless access to stadiums and trade fairs in the 5G world, it is required to actively install and use base station devices and access points at high places such as ceilings. ..

Atsushi Ota, Tatsuhiko Iwakuni, Kazuki Maruta, Hiroshi Shirato, Takuto Arai, Masataka Iizuka, “A Study on Effective Use of Spatial Degree of Freedom for Inter-User Interference Suppression of Multi-User Massive MIMO in Time-Varying Channel Environment”, General Incorporated Association IEICE, IEICE Technical Report, vol. 115, no. 113, RCS2015-54, p. 49-54, June 2015

In the wireless access to the stadium and the trade fair site in the 5G world described above, it is expected to install the base station device and the access point at a high place such as a ceiling. However, in such a high place, maintenance of the installed device becomes a big problem.

In addition, since transmission of a large capacity is required, a very high-definition device is required. Even if a failure occurs in any of the optical terminator to which the optical fiber is connected, the interface device of 10 Gbit/s or more, the 5G small cell base station device, etc., it is installed at a high place and therefore it is not easy to replace it. Have difficulty. For example, in the case of lighting, a huge number of light bulbs illuminate the entire stadium, so installing a number of light bulbs that allows for some margin will hinder serviceability even if a small number of light bulbs are found to be defective. Does not come out. On the other hand, in the case of a base station device or an access point, the service area covered by each device is determined by the design, so users in the service area covered by the failed base station device cannot receive the service. there is a possibility. Therefore, there is a demand for a system that can promptly perform maintenance in the event of some failure of a base station device installed at a very high place such as a stadium or the ceiling of a trade fair site.

Note that the connector that connects the optical fiber and the optical terminator is not a loose connector connection, but has a structure with little play to ensure the transmission of optical signals between the optical fibers that are connected by the connector. It is generally required to securely attach and detach, and the structure is such that once connected, it cannot be easily removed. Therefore, it is not easy to attach/detach by remote control.

In view of the above circumstances, it is an object of the present invention to provide a base station device and a wireless communication system that can reduce the load of maintenance and provide a wireless access service.

One aspect of the present invention is a base station device that provides a wireless access service to a terminal device within a predetermined area, the base station device providing a wireless access for the wireless access service to the terminal device. The wireless access base station device includes an access base station device and a fixed installation unit that is attachable to and detachable from the wireless access base station device. The wireless access base station device includes a flight unit that is three-dimensionally movable in space and the fixed installation unit. A first attachment/detachment unit that can be connected and disconnected, a first wireless communication unit that wirelessly communicates with the terminal device, and a signal transmitted and received by the terminal device via the first wireless communication unit to a network. A state in which a second wireless communication unit that transmits and receives using a wireless entrance base station apparatus that is another wireless station apparatus to be connected using a wireless entrance line, and the first attachment/detachment section is connected to the fixed installation section. And a power receiving unit that receives power from the fixed installation unit, the fixed installation unit including a second attachment/detachment unit capable of connecting and disconnecting with the radio access base station apparatus, and the second attachment/detachment unit. A power supply unit that supplies power to the radio access base station device in a state in which the unit is connected to the radio access base station device.

One aspect of the present invention is the above-described base station apparatus, wherein one or both of the first attachment/detachment portion and the second attachment/detachment portion are in a connected state and a released state due to upward buoyancy obtained by the flying unit. It has a mechanism to switch between.

One aspect of the present invention is a wireless communication system that provides a wireless access service to a terminal device within a predetermined area, wherein the wireless communication system provides a wireless access for the wireless access service to the terminal device. An access base station device, a fixed installation unit detachable from the wireless access base station device, and a wireless entrance base station device connected to a network are provided, and the wireless access base station device moves three-dimensionally in space. Through a possible flying unit, a first attaching/detaching unit capable of connecting and disconnecting the fixed installation unit, a first wireless communication unit that wirelessly communicates with the terminal device, and the first wireless communication unit. A second wireless communication unit that transmits and receives a signal transmitted and received by the terminal device to and from the wireless entrance base station device using a wireless entrance line, and the first attaching/detaching unit are connected to the fixed installation unit. A power receiving unit that receives power supply from the fixed installation unit in a state, the fixed installation unit includes a second attachment/detachment unit capable of connecting and disconnecting with the radio access base station device, and the second A wireless power access unit that supplies power to the wireless access base station device in a state in which an attachment/detachment unit is connected to the wireless access base station device, wherein the wireless entrance base station device uses the entrance line to perform the wireless access. A third wireless communication unit that wirelessly communicates with the base station device is provided.

According to the present invention, it is possible to reduce the maintenance load and provide a wireless access service.

It is a figure which shows the outline of the base station apparatus for high places installation in embodiment of this invention. It is a sectional view of a base station device for high places installation in the same embodiment. It is a figure which shows the outline of the communication service which the wireless communication system in the same embodiment provides. It is a figure which shows the environment in case a base station apparatus is installed in a comparatively low place and a beam is irradiated from a horizontal direction. It is a figure which shows the environment in case a base station apparatus is installed in a high place and irradiates a beam from an upper direction.

Embodiments of the present invention will be described in detail with reference to the drawings. The basic idea is that all functions such as an optical termination function, which is a high-definition function in a base station device, to which an optical fiber is connected, an interface function of 10 Gbit/s or more, and a base station function are fixed installation in a high place. Instead, only the power supply function with a relatively low possibility of failure is fixedly installed at a high place (hereinafter referred to as "fixed installation power supply unit"). The functions other than the fixed installation power supply unit and the power receiving function are made detachable from the fixed installation power supply unit at a high place, and the attachment/detachment is realized by using an unmanned flight function such as a drone. When using an optical fiber to provide the entrance line to this base station device, it is difficult to securely connect and disconnect the connector by remote control. Therefore, we will give up the entrance line using the optical fiber and use the wireless line to enter the entrance line. I will provide a. Power supply is achieved by contact-type power supply using a magnet or the like for the contacts (for example, a connection mechanism between the power cable of the "electric pot" and the pot body) or power supply by non-contact power transmission, and then attachment/detachment make it easier.

A specific configuration is shown below with reference to the drawings. FIG. 1 is a diagram showing an outline of a high place installation base station apparatus 100 according to an embodiment of the present invention. In the figure, a base station apparatus 100 for high altitude installation includes a radio station apparatus 10 for high altitude installation and a fixed installation power supply unit 20. The radio station apparatus 10 for high altitude installation includes a radio section 11, an unmanned flight function control section 12, a fixing and power receiving section 13, attachment/detachment guide sections 14-1 to 14-4, and rotor sections 15-1 to 15-. 4 and a camera unit 16. The fixed installation power supply unit 20 includes a ceiling fixed plate 21, a fixed/power supply unit 22, and attachment/detachment guide units 23-1 to 23-4.

The aerial installation radio station apparatus 10 shown in the figure obtains buoyancy by the rotor units 15-1 to 15-4 controlled by the unmanned flight function control unit 12, and is unmanned in any direction in the vertical direction and the horizontal direction. It flies in and can move in three dimensions in space. On the other hand, the fixed installation power supply unit 20 is fixedly installed at a high place such as a ceiling, and a commercial power supply or the like is connected at the time of installation. When the radio station apparatus 10 for high altitude installation is installed in a high altitude, the unmanned flight function control unit 12 is remotely operated by a radio control unit (not shown). The radio control unit controls the moving direction of the aerial installation radio station apparatus 10 by wirelessly transmitting a control signal according to a user operation or the like, and, for example, a camera unit mounted on the aerial installation radio station apparatus 10. It may be provided with a function of wirelessly receiving and displaying an image captured by 16 at the radio control operation unit. By confirming the image from the camera section 16 (and confirming directly by visual inspection), the wireless station apparatus 10 for high place installation is brought close to the fixed installation power supply section 20 so that the wireless terminal apparatus 10 can be fixed appropriately. ..

The aerial installation radio station apparatus 10 and the fixed installation power supply unit 20 can be fixed in appropriate positional relations, respectively, so that the attachment/detachment guide portions 14-1 to 14-4 and the attachment/detachment guide portion 23-1 can be fixed. ~23-4. In this figure, the attachment/detachment guide portions 14-1 to 14-4 of the high-place installation radio station apparatus 10 have a conical shape, and the attachment/detachment guide portions 23-1 to 23-4 of the fixed installation power supply unit 20 are On the contrary, a conical space is secured inside the cylinder. The buoyancy of the rotor parts 15-1 to 15-4 by the radio station apparatus 10 for high place installation is substantially aligned with the attachment/detachment guide parts 14-1 to 14-4 and the attachment/detachment guide parts 23-1 to 23-4. When it is moved up by, the conical attachment/detachment guide portions 14-1 to 14-4 and the attachment/detachment guide portions 23-1 to 23-4 are engaged with each other and guided to a precise location with high accuracy.

The fixed installation power supply unit 20 includes a fixed and power feeding unit 22, and when the high location installation wireless station device 10 is guided to an appropriate place, the fixed and power feeding unit 22 is connected to the fixed and power receiving unit 13. The high-position installation wireless station device 10 is fixed so as not to fall off, and power is supplied from the fixed/power feeding unit 22 to the fixed/power receiving unit 13. The power received by the fixed and power receiving unit 13 is supplied to each function unit such as the wireless unit 11 that operates by power in the wireless station apparatus 10 for high places. If the radio station apparatus 10 for high altitude installation does not deteriorate while the buoyancy is reduced by the operation from the radio control unit, it is confirmed that the radio station apparatus 10 for high altitude installation has been fixed. The control unit instructs the unmanned flight function control unit 12 to stop the rotor units 15-1 to 15-4. During operation of the radio station apparatus 10 for high altitude installation, the rotor units 15-1 to 15-4 are always used in a stopped state.

Next, when performing maintenance of the radio station apparatus 10 for installation at high places, the radio control unit instructs the unmanned flight function control unit 12 to rotate the rotor units 15-1 to 15-4 to install at high places. Buoyancy is applied to the wireless station device 10. Although the fixed and power feeding unit 22 and the fixed and power receiving unit 13 are initially connected, when the fixed and power receiving unit 13 pushes the fixed and power feeding unit 22 by buoyancy due to a push-cancel type coupling mechanism or the like. The connection is released. In this state, when the radio control unit instructs the unmanned flight function control unit 12 to reduce the buoyancy by the rotor units 15-1 to 15-4, the fixed and power feeding unit 22 and the fixed and power receiving unit 13 are separated from each other and installed at high places. The radio station apparatus 10 can fly in a completely free state, and is guided and stored on the ground by an operation from the radio control unit. Although not shown in the figure, in order to utilize the drone's unmanned flight function without receiving power via the fixed and power receiving unit 13, a battery is naturally mounted in the high-altitude radio station device 10. In normal operation, it also has a function of charging the battery with electricity received through the fixed and power receiving unit 13. The electric power charged in the battery is supplied to each functional unit operated by electric power in the radio station apparatus 10 for high altitude installation, or at least the functional unit related to the unmanned flight function among the functional units.

FIG. 2 is a cross-sectional view of the high-place installation base station device 100 according to the embodiment of the present invention. The meaning of the cross-sectional view here does not represent a cross-section in a predetermined plane in a strict sense, and should be construed as a view shown so that the entire structure can be understood. The radio unit 11, the unmanned flight function control unit 12, the attachment/detachment guide units 14-a to 14-b, the rotor units 15-a to 15-b, the camera unit 16, the fixing units 17-a to 17-b, and The power receiving unit 18 is provided in the base station device 100 for high altitude installation. Ceiling fixed plate 21, attachment/detachment guide parts 23-a-23-b, power feeding part 24, fixing claws 25-a-25-b, hinge parts 26-a-26-b, and push/cancel fixing parts 27-a-. 27-b is provided in the fixed installation power supply unit 20. The reference numerals -a and b in the same figure are described using serial numbers such as -1 to 4 in FIG. 1, but since they are described in a sectional view here, any of the numbers such as -1 to 4 is used. Understand that it corresponds.

As described in FIG. 1, the inside of the attachment/detachment guide portions 23-a-23-b has a conical cavity, and the centers of the attachment/detachment guide portions 14-a-14-b and the attachment/detachment guide portions 23-a-23-b. If the attachment/detachment guide portions 14-a to 14-b can be aligned with the accuracy of the diameter of the attachment/detachment guide portions 23-a to 23-b even if the axes are not exactly aligned, the wireless station apparatus for high place installation Guided to the correct position with a rise of 10.

In FIG. 1, the structures of the fixed and power receiving unit 13 and the fixed and power feeding unit 22 are outlined, but in the same figure, they are shown in a more concrete manner. In this figure, the fixing and power receiving unit 13 is composed of fixing units 17-a to 17-b and a power receiving unit 18. Similarly, the fixing and power feeding unit 22 includes fixing claws 25-a to 25-b, hinge portions 26-a to 26-b, and push/cancel fixing portions 27-a to 27-b. The fixing portions 17-a to 17-b have a lateral protrusion, and when the fixing claws 25-a to 25-b are applied to the fixing portions 17-a to 17-b, the wireless station apparatus 10 for high place installation and the fixed installation power supply unit 20 are connected. It will be in a state of being. The fixing claws 25-a to 25-b are in a movable state via the hinge portions 26-a to 26-b. The push/cancel fixing portions 27-a to 27-b repeat the locked state in which the spring contracts and the released state in which the spring contracts each time when a force is applied upward. In the locked state in which the spring is contracted, the fixing claws 25-a to 25-b are narrowed inward via the hinge portions 26-a to 26-b, and the lateral protrusions of the fixing portions 17-a to 17-b are prevented. It will be sandwiched. The push/cancel fixing parts 27-a to 27-b can repeat the push state as the radio station apparatus 10 for high places moves up and down, and as a result, the lock state and the release state can be arbitrarily set. Selectable and removable.

The power receiving unit 18 and the power feeding unit 24, for example, in the case of contact type power feeding, allow the power receiving unit 18 and the power feeding unit 24 to have some degree of freedom of play, and when both approach each other, a contact state is secured by a magnet or the like, On the other hand, at the time of collection, it is possible to easily separate when it descends by its own weight. Alternatively, the power may be supplied by non-contact type power transmission as long as the power receiving unit 18 and the power feeding unit 24 come close to each other at a predetermined distance.

FIG. 3 is a diagram showing an outline of communication services provided by the wireless communication system 200 according to the embodiment of the present invention. In the figure, a wireless communication system 200 includes a wireless entrance base station device 6 and a wireless unit 7. The wireless unit 7 represents the wireless unit 11 included in the wireless station device 10 for high altitude installation. Terminal stations 2-a to 2-g are present in the small cells 1-a to 1-g, respectively. Reference numeral 5 represents a human body. The radio unit 7 of the radio station apparatus 10 for high altitude installation has a relay station function for communicating with the radio entrance base station apparatus 6 in accordance with the function of the Massive MIMO base station 4 in FIG. Generally, since it is assumed that a wireless standard different from the function of the Massive MIMO base station 4 and the relay station function for communicating with the wireless entrance base station device 6 is used, a physically independent device and an independent antenna are used. Although it is assumed to use, a single wireless unit 7 including both functions is shown here for simplification of description. Although not shown here, the mechanism shown in FIGS. 1 and 2 is attached to the upper part of the wireless section 7 of the wireless station apparatus 10 for installation in high places, and the mechanism is installed in a high place such as a ceiling. , It is also possible to use the unmanned flight function to collect for maintenance if necessary. The wireless entrance base station device 6 is connected to an optical fiber network on the ground. The base station device function of the radio unit 7 of the high location installation radio station device 10 and the traffic when the terminal stations 2-a to 2-g communicate with each other will be described with reference to the radio unit 7 of the high location installation radio station device 10 and the radio entrance. It is transmitted by a wireless line between the base station devices 6. As a result, it is possible to irradiate the terminal stations 2-a to 2-g with a beam in a form of looking down from a high place, but it is possible to easily realize maintenance as required.

As described above, the wireless entrance base station device 6 is installed on the ceiling to realize picocell subdivision in a place where ultra-high density, ultra-high number, and ultra-high capacity transmission by ultra-heavy users occur in stadiums and trade fairs. An entrance line is wirelessly provided to the base station apparatus 100 for high altitude installation. This is because it is not easy to attach/detach optical equipment using connectors, and it is not possible to easily deal with maintenance at the time of failure or version upgrade of equipment. In the present embodiment, in order to reduce the maintenance load, the fixed installation power supply unit 20 installed on the ceiling or the like supplies only power, and the wireless station apparatus 10 for installation in high places is equipped with an installation and recovery mechanism utilizing a drone or the like. In combination with the above, the service is provided to the user below the high-place installation radio station apparatus 10. For example, in the case of a stadium, the wireless entrance base station device 6 is installed in the vicinity of the lower stage of the stand, and the capacity is increased by performing spatial multiplex transmission to a plurality of base station devices 100 for high altitude installation by utilizing the line-of-sight environment. It can also be realized.

The wireless station apparatus for high altitude installation of this embodiment must reliably switch between the locked state in the connected state and the released state at the time of collection in order to ensure the attachment/detachment with the fixed installation power supply unit. In order to perform this switching with a simple mechanism with few failures, the buoyancy obtained by the unmanned flight function is used to realize the locked state and the released state by push-cancel operation.

Even if the aerial installation radio station device breaks down and it is no longer possible to perform remote collection of the device, a similar drone is blown toward the abandoned aerial installation radio station device. The push-cancel type lock can be unlocked by applying an upward force from the lower part of the wireless station device for high altitude installation by the buoyancy of the drone, and it can be recovered by removing it from the fixed installation power supply part.

With conventional technology, when installing and using base station equipment or access points in ultra high places such as the ceiling of stadiums and trade fairs, it is difficult and easy to perform maintenance in the event of a failure. It was In the present embodiment, as described above, the base station device for high altitude installation is obtained by combining the radio station device for high altitude installation, which is a flying vehicle having a wireless function, with the fixed installation power supply unit installed on the ceiling or the like. Constitute. Since the flight function of the wireless station device for high places can be used to attach and detach to and from the fixedly installed power supply unit, it is possible to improve the maintainability and provide a wireless service from the high place to the downside. Is possible.

Although the embodiments of the present invention have been described above with reference to the drawings, the above embodiments are merely examples of the present invention, and it is obvious that the present invention is not limited to the above embodiments. is there. For example, the structure of the attachment/detachment guide portions 14-a to 14-b and the attachment/detachment guide portions 23-a to 23-b shown in FIG. 2 is only an example, and any other structure may realize the same function. Absent. In addition, when power supply by non-contact type power transmission is used, equipment of any standard may be used, and it is not always necessary to use a magnet when contact-type power supply is performed. Even in the wireless communication performed by the wireless unit installed in the wireless station apparatus for high places, it is possible to use an arbitrary wireless standard for both the wireless entrance line and the access line with the terminal station. In FIG. 3, the radio unit has the image of the Massive MIMO base station function. However, it is not always necessary to have a multi-element antenna element, and a single-element antenna accommodates one small cell or pico cell. It may be configured. Alternatively, a plurality of single directional antennas may be used, and each directional antenna may form an individual small cell or pico cell. Therefore, additions, omissions, replacements, and other changes of the constituent elements may be made without departing from the technical idea and scope of the present invention.

According to the embodiment described above, the wireless communication system (for example, the wireless communication system 200) that provides the wireless access service to the terminal devices (for example, the terminal stations 2-a to 2-g) in the predetermined area is wireless. An access base station apparatus (for example, a radio station apparatus 10 for installation at a high place), a fixed installation section (for example, a fixed installation power supply section 20), and a wireless entrance base station apparatus (for example, a wireless entrance base station apparatus 6) are provided. Prepare The wireless access base station device provides wireless access for a wireless access service to the terminal device and has a communication function with the wireless entrance base station device. The fixed installation unit is attachable to and detachable from the radio access base station device. The wireless entrance base station device is a wireless station device connected to a network such as an optical fiber network on the ground, and has a communication function with the wireless access base station device.

The wireless access base station device includes a flight unit (for example, unmanned flight function control unit 12, rotor units 15-1 to 15-4) and a first attachment/detachment unit (for example, fixing and power receiving unit 13, fixing unit 17-a). 17-b), a first wireless communication unit (for example, a partial function of the wireless unit 7 and the wireless unit 11), and a second wireless communication unit (for example, a partial function of the wireless unit 7 and the wireless unit 11). ) And a power receiving unit (for example, the power receiving unit 18). The flying unit can move in three dimensions in space. The first attaching/detaching portion can be connected/disconnected with the fixed installation portion. The first wireless communication unit performs wireless communication for wireless access with a terminal device in the area. The second wireless communication unit transmits/receives a signal transmitted/received by the terminal device via the first wireless communication unit to/from the wireless entrance base station device using a wireless entrance line. The power receiving unit receives power from the fixed installation unit in a state where the first attachment/detachment unit is connected to the fixed installation unit, and supplies the power to each unit that operates by electric power.

The fixed installation portion includes a second attachment/detachment portion (for example, fixing claws 25-a to 25-b, hinge portions 26-a to 26-b, push/cancel fixing portions 27-a to 27-b), and power feeding. Section (for example, the power feeding section 24). The second attachment/detachment unit can connect to and disconnect from the radio access base station device. The power feeding unit supplies power to the radio access base station device in a state where the second attaching/detaching unit is connected to the radio access base station device.

The wireless entrance base station device includes a third wireless communication unit and a communication unit. The third wireless communication unit wirelessly communicates with the wireless access base station device using a wireless entrance line. The communication unit transmits the signal received by the third wireless communication unit to a network (for example, an optical fiber network on the ground) connected to the communication destination of the terminal device, and receives the signal addressed to the terminal device from the network. Transfer to the third wireless communication unit.

One or both of the first attachment/detachment portion and the second attachment/detachment portion may include a mechanism that switches between a connected state and a released state by upward buoyancy obtained by the flying unit.

The embodiment of the present invention has been described in detail above with reference to the drawings, but the specific configuration is not limited to this embodiment, and includes a design etc. within the scope not departing from the gist of the present invention.

It is applicable to a wireless communication device.

10... Radio station apparatus 20 for high-altitude installation... Fixed installation power supply sections 2-a to 2-g... Terminal station 5... Human body 6... Radio entrance base station apparatus 7... Radio section 11... Radio section 12... Unmanned flight function control Part 13: fixing and power receiving parts 14-1 to 14-4, 14-a to 14-b... attachment/detachment guide part,
15-1 to 15-4, 15-a to 15-b... Rotor part 16... Camera parts 17-a to 17-b... Fixed part 21... Ceiling fixed plate 22... Fixed and power feeding parts 23-1 to 23-4 23-a to 23-b... Attachment/detachment guide section 24... Power feeding section 25-a to 25-b... Fixing claw 26-a to 26-b... Hinge section 27-a to 27-b... Push/cancel fixing section 100... Base station device 200 for high altitude installation... Wireless communication system

Claims (3)

A base station device that provides a radio access service to a terminal device within a predetermined area,
The base station device is
A radio access base station device that provides radio access for a radio access service to the terminal device;
The wireless access base station device and a detachable fixed installation unit,
The radio access base station device,
A flying unit that can move three-dimensionally in space,
A first attaching/detaching portion capable of connecting and disconnecting with the fixed installation portion;
A first wireless communication unit that wirelessly communicates with the terminal device;
A second radio that transmits/receives a signal transmitted/received by the terminal device via the first radio communication unit to/from a radio entrance base station device, which is another radio station device connected to the network, using a radio entrance line. Communication department,
A power receiving unit that receives power from the fixed installation unit in a state where the first attachment/detachment unit is connected to the fixed installation unit,
The fixed installation section,
A second attaching/detaching part capable of connecting and disconnecting with the radio access base station device;
A power supply unit that supplies power to the radio access base station device in a state in which the second attachment/detachment unit is connected to the radio access base station device.
Base station device. One or both of the first attachment/detachment portion and the second attachment/detachment portion includes a mechanism for switching between a connected state and a released state by upward buoyancy obtained by the flying unit.
The base station device according to claim 1. A wireless communication system for providing a wireless access service to a terminal device within a predetermined area,
The wireless communication system,
A radio access base station device that provides radio access for a radio access service to the terminal device;
A fixed installation unit detachable from the wireless access base station device;
A wireless entrance base station device connected to the network,
The radio access base station device,
A flying unit that can move three-dimensionally in space,
A first attaching/detaching portion capable of connecting and disconnecting with the fixed installation portion;
A first wireless communication unit that wirelessly communicates with the terminal device;
A second wireless communication unit that transmits and receives a signal transmitted and received by the terminal device via the first wireless communication unit to and from the wireless entrance base station device using a wireless entrance line;
A power receiving unit that receives power from the fixed installation unit in a state where the first attachment/detachment unit is connected to the fixed installation unit,
The fixed installation section,
A second attaching/detaching part capable of connecting and disconnecting with the radio access base station device;
A power supply unit that supplies power to the radio access base station device in a state in which the second attachment/detachment unit is connected to the radio access base station device,
The wireless entrance base station device,
A third wireless communication unit that wirelessly communicates with the wireless access base station device using the entrance line,
Wireless communication system.

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