JP2000270362A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently utilize a frequency band by setting a communication space area to each space formed between buildings and respectively arranging a base station to each area so as to suppress the mutual interference of radio waves. SOLUTION: In multiple dwelling house where the residential buildings A, B and C stand together, communication space area cells 1 and 2 are set between the building A and B, B and C, and the base stations 11 and 12 are arranged to execute bi-directional radio communication between subscriber's stations 101, 102, 201 and 202 belonging to each cell. In this case, since the building B which is high in a radio shielding effect is arranged between the boundary of the cell 1 and the cell 2, the interference of radio communication between the cell 1 and the cell 2 is almost prevented. Thus, since the frequency bands of radio communication to be used in the cell 1 and the cell 2 can be equal, the same frequency band can be used repeatedly. Thus nearly the whole of a prescribed frequency band can be shared by the subscribers of each cell to improve a communication service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system, and more specifically, a base station is arranged for each of a plurality of communication space areas (cells) sharing a predetermined frequency band and belongs to each communication space area. The present invention relates to a wireless communication system for performing wireless communication between a subscriber station and a base station in the communication space area.

[0002]

2. Description of the Related Art For example, a one-to-many bidirectional wireless system for transmitting and receiving data between a plurality of subscriber stations and a base station in an area having a radius of about several kilometers using quasi-millimeter waves or millimeter waves of about 20 GHz to 40 GHz. There is a communication system. This wireless communication system requires a relatively wide frequency band, such as providing video data such as movies on demand, in addition to services for connecting to the Internet, because construction work that strongly depends on subscribers such as in-home wiring is reduced. Services can be provided at low cost. By the way, especially in urban areas, subscribers tend to be concentrated in a specific area due to an increase in condominiums with a plurality of residential buildings. Since the frequency band available in a certain service area is limited, if the number of necessary channels increases due to an increase in the number of subscribers, the frequency band available per channel decreases accordingly. In order to increase the frequency band that can be used for one channel in the limited frequency band, for example, the same frequency band may be repeatedly used. However, in this case, it is necessary to prevent interference between a plurality of communications using the same frequency band. A wireless communication system that repeatedly uses the same frequency band while preventing such interference is a cellular system. In a cellular system, a service area for providing wireless communication services is divided into a plurality of smaller communication space areas (cells), and different frequency bands are allocated to adjacent cells, and cells using the same frequency band are spatially divided. By disposing them separately, the frequency band allocated to the service area is effectively used, and interference between a plurality of communications using the same frequency band is prevented.

[0003]

However, even in the above-mentioned cellular system, it is necessary to allocate different frequency bands to adjacent cells in order to prevent interference, so that the frequency band that can be used per channel decreases accordingly. Inevitable. In order to solve the problems in the conventional technology, the present invention has improved a wireless communication system. The same frequency band is repeatedly used for each communication space area by arranging base stations for each space to be formed and setting the boundaries of a plurality of communication space areas sharing a predetermined frequency band by the building. It is another object of the present invention to provide a wireless communication system capable of preventing interference between a plurality of wireless communication using the same frequency band.

Further, even if the same frequency band is repeatedly used for each of a plurality of communication space regions sharing a predetermined frequency band to prevent interference between a plurality of communications, a channel is allocated to each of a plurality of subscriber stations, for example. In this case, as the number of subscriber stations belonging to a certain communication space area increases, the frequency band available to each subscriber decreases. Therefore, another object of the present invention is to further divide each communication space area into a plurality of small space areas, arrange the base stations for each small space area, and determine the subscriber station belonging to each small space area and the corresponding subscriber station. The base station and the subscriber station are arranged such that the directions of radio waves of radio communication having directivity performed with the base station in the small space area are different between adjacent small space areas. Accordingly, it is an object of the present invention to provide a wireless communication system capable of reusing a frequency band shared in each communication space area for each small space area while preventing interference. Further, when performing bidirectional communication having directivity between the subscriber station and the base station, the line from the subscriber station to the base station and the line from the base station to the subscriber station are limited. The divided frequency band is divided, and the frequency band that can be used in each line is substantially reduced. Therefore, still another object of the present invention is to provide a method for subscribing to the base station such that the direction of radio waves is different between the line from the subscriber station to the base station and the line from the base station to the subscriber station. Wireless communication that can use the same frequency band repeatedly on the line from the subscriber station to the base station and on the line from the base station to the subscriber station while preventing interference by arranging the subscriber station and the subscriber station. Is to provide a system. In addition, for a building group in which a plurality of buildings are constructed in proximity to each other as described above, base stations are arranged for each space formed between adjacent buildings, and a predetermined number of buildings are arranged by the buildings. When the boundaries of multiple communication space areas that share a frequency band are set respectively, radio waves of wireless communication performed in a certain communication space area are shielded by buildings, and hardly reach other communication space areas, but base stations and Depending on the installation state of the subscriber station and the structure of the building, for example, a radio wave may be transmitted through a glass window or the like and leak to another communication space area. This problem similarly occurs when, for example, wireless communication is performed from a relay station corresponding to a base station to a subscriber station. Therefore, still another object of the present invention is to make the direction of the radio wave transmitted from the base station (including the relay station) to the subscriber station different for each communication space area at least within the reach of the radio wave. An object of the present invention is to prevent interference between a plurality of communications using the same frequency band even when radio waves of wireless communication performed in a certain communication space reach another communication space, that is, when there is so-called overreach.

[0005]

According to a first aspect of the present invention, a base station is arranged for each of a plurality of communication space areas sharing a predetermined frequency band, and each communication space area is provided with a base station. In a wireless communication system for performing wireless communication between a plurality of subscriber stations belonging to the group and a base station in the communication space area, a building group in which a plurality of buildings are constructed in close proximity to each other The wireless communication system is characterized by arranging the base stations for each space formed between objects and setting a boundary of each communication space region by the building. According to a second aspect of the present invention, in the wireless communication system according to the first aspect,
The gist is that part or all of the predetermined frequency band is repeatedly used for each communication space area. According to a third aspect of the present invention, in the wireless communication system according to the second aspect, the radio wave of the wireless communication performed between the subscriber station and the base station has directivity. The space area is further divided into a plurality of small space areas, and the base station is arranged for each small space area, and the process is performed between a subscriber station belonging to each small space area and a base station in the small space area. The gist of the invention is that the base station and the subscriber station are arranged so that the directions of radio waves of wireless communication differ between adjacent small space regions. Also,
The invention according to claim 4 is the invention according to any one of claims 1 to 3 above.
In the wireless communication system described in the paragraph, when performing bidirectional communication having directivity between the subscriber station and the base station, a line from the subscriber station to the base station and a line from the base station to the subscriber station are provided. The gist is that the base station and the subscriber station are arranged so that the directions of the radio waves are different from each other in the line to the line. According to a fifth aspect of the present invention, in the wireless communication system according to any one of the first to fourth aspects, a direction of a radio wave transmitted from the base station to the subscriber station is at least a reach distance of the radio wave. The main point is that the communication space area is different for each communication space area. According to a sixth aspect of the present invention, in the wireless communication system according to the fifth aspect, the base stations in the adjacent communication space area are vertically displaced from each other. The invention according to claim 7 is based on claim 5 or 6.
In the wireless communication system described in (1), the gist is that base stations in the adjacent communication space area are horizontally shifted from each other.

According to the wireless communication system of any one of claims 1 to 7, a plurality of buildings are formed between adjacent buildings with respect to a group of buildings constructed in close proximity. By arranging base stations in each space to be set and setting boundaries of a plurality of communication space areas that share a predetermined frequency band by the building, the same frequency band is repeatedly used for each communication space area. However, interference between a plurality of wireless communications using the same frequency band can be prevented. Moreover, according to the wireless communication system of the third aspect, each communication space area is further divided into a plurality of small space areas, and the base station is arranged for each small space area.
The direction of the radio wave of the radio communication having directivity performed between the subscriber station belonging to each small space area and the base station in the small space area may be different between the adjacent small space areas. By arranging the base station and the subscriber station, the frequency band shared in each communication space area can be reused for each small space area while preventing interference. As a result, a high-speed wireless communication service can be provided even if the number of channels required in each communication space area increases. According to the wireless communication system of the fourth aspect, when performing bidirectional communication having directivity between the subscriber station and the base station, a line from the subscriber station to the base station is connected. With the line from the base station to the subscriber station,
By arranging the base station and the subscriber station so that the directions of radio waves are different from each other, a line from the subscriber station to the base station and a line from the base station to the subscriber station are prevented while preventing interference. Thus, the same frequency band can be used repeatedly. Further, any one of claims 5 to 7 above.
According to the wireless communication system described in the paragraph, by making the direction of the radio wave transmitted from the base station to the subscriber station different for each communication space region at least within the reach of the radio wave, Even when the radio wave of the wireless communication to be performed reaches another communication space area, that is, when there is so-called overreach, it is possible to prevent interference between a plurality of communication using the same frequency band. The base station includes a relay station that receives a radio wave from a certain base station and distributes the received content to a subscriber station. Can be used, and the frequency band can be used effectively.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The following embodiment is a specific example of the present invention and does not limit the technical scope of the present invention. FIG. 1 is a diagram showing a basic configuration of a wireless communication system according to one embodiment of the present invention. A wireless communication system according to one embodiment of the present invention provides a high-speed two-way data communication service for each of a plurality of subscribers in a service area, for example, as a service area in an apartment house with a plurality of residential buildings. Of the present invention. As shown in FIG. 1, the radio communication system according to the present embodiment includes a base station 11 (11,...) For each of a plurality of communication space areas (cells) 1 and 2 obtained by dividing a service area where a predetermined frequency band can be used. ), 21 (21,
..), And the subscriber stations 10 belonging to each of the cells 1 and 2
1, 102 (101,...), 201, 202 (201,
..) And the base stations 11 and 21 of the cells 1 and 2 are similar to the conventional ones. On the other hand, the wireless communication system according to the present embodiment differs from the conventional wireless communication system in that a plurality of residential buildings (examples of buildings) A, B, and C are constructed in close proximity to each other. The base stations 11 and 12 are provided for each space formed between the adjacent residential buildings A, B, and C.
1 are arranged, the boundaries of the cells 1 and 2 are set by the housing buildings A, B and C, and almost all of the predetermined frequency band is repeatedly used for each of the cells 1 and 2. . Hereinafter, the basic configuration of the wireless communication system according to the present embodiment and other examples will be described with different cases.

(Basic Configuration) As shown in FIG. 1, in the above-mentioned radio communication system, base stations 11 and 21 are arranged in spaces formed between adjacent residential buildings A, B and C, respectively, and Cells 1 and 2 sharing the same frequency band
Is set by the residential buildings A, B, and C. For example, in FIG. 1B, a cell 1 is set in a space between the residential building A and the residential building B, and a cell 2 is set in a space between the residential building B and the residential building C. In each of the cells 1 and 2, the base station 11,
Reference numeral 21 denotes, for example, a subscriber station 10 provided in each of the middle buildings of the residential buildings A and B, and located in the residential buildings B and C in the cells 1 and 2, respectively.
1, 102, 201, and 202 are provided with two-way wireless communication services. Thus, base station 1 of cells 1 and 2
By arranging the cells 1 and 21, the residential building B having a high radio wave shielding effect is arranged at the boundary between the adjacent cells 1 and 2. Therefore, the interference between the radio communication between the base station 11 in the cell 1 and the subscriber stations 101 and 102 and the radio communication between the base station 21 in the cell 2 and the subscriber stations 201 and 202 is , Almost irrespective of whether the radio wave has directivity or not. Therefore, in the wireless communication system according to the present embodiment, the frequency band used for wireless communication between the base station 11 in the cell 1 and the subscriber stations 101 and 102, and the base station and the subscriber station in the cell 2 The frequency band used for wireless communication between the wireless communication apparatuses 201 and 202 is set to be the same. That is, the same frequency band is repeatedly used in cell 1 and cell 2. Thus, unlike the case where a cellular system is applied, it is not necessary to make the frequency bands different in order to prevent interference between adjacent cells.
Almost all of the predetermined frequency band shared among the subscribers can be shared by the subscribers in each cell, and a higher-speed and higher-quality communication service can be provided.

(Embodiment 1) However, for example, when providing a radio communication service for each subscriber, when the number of subscribers in the residential buildings A and B, which is the boundary of the cell 1, is extremely large, that is, in the cell 1, When the number of channels provided is extremely large,
Even if almost all of the predetermined frequency band can be shared by the subscribers in the cell 1, the frequency band that can be used by each subscriber in the cell 1 becomes narrow. A first embodiment that suppresses a decrease in the used frequency band due to such an increase in the channel will be described below. Also in the first embodiment, cells are set in a space formed between adjacent residential buildings as in the basic configuration described above. FIG. 2 illustrates only the cell 1 set between the residential building A and the residential building B. As shown in FIG. 2, the first embodiment differs from the above basic configuration in that a plurality of base stations 11, 12, and 13 are provided in a cell 1,
The radio waves for wireless communication between the mobile stations 2 and 13 and the subscriber stations 101, 102 and 103 each have directivity, and the cell 1 has a plurality of small space areas 1A, 1B and 1C which are smaller.
And the base stations 11, 12, 1 are arranged such that the directions of radio waves for wireless communication are different from each other for each adjacent small space area.
3 and subscriber stations 101, 102, and 103, respectively. In the example of FIG. 2, among the plurality of base stations 11, 12, and 13 provided in the cell 1, the base station 1
Numerals 1 and 13 are provided in the upper and lower layers of the residential building B, respectively.
103 is used to perform wireless communication with each other. In addition, the base station 12 is provided in the middle section of the residential building A,
It is used for wireless communication with the subscriber station 102 in the middle floor of the residential building B. Such a base station 11, 1
The arrangement of the subscriber stations 101, 102, and 103 and the subscriber stations 101, 102, and 103 is limited in the frequency band that can be used in the cell 1. Therefore, a decrease in the frequency band used for each channel due to an increase in the number of channels is suppressed. This is because it is necessary to use the same frequency band repeatedly while preventing interference in the cell 1. For example, in FIG.
1, the downlink from the base station 11 to the subscriber station 101 is directed to the right side in the drawing, and the uplink from the subscriber station 101 to the base station 11 is directed to the right side in the drawing. However, in the small space area B including the base station 12, the downlink from the base station 12 to the subscriber station 102 is directed to the left side of the drawing, and the subscriber station 102
The up line to is directed to the right side of the drawing. That is, in the adjacent small space area A and small space area B, the directions of radio waves used for wireless communication performed between the subscriber stations 101 and 102 and the base stations 11 and 12 are opposite to each other. As described above, the base stations 11 and 12 and the subscriber station 10
1 and 102 are arranged, and the arrangement of such base stations and subscriber stations is the same between the adjacent small space areas 1B and 1C. This can prevent interference between a plurality of communications using the same frequency band. Therefore, even when the number of channels increases in each cell due to an increase in the number of subscribers or the like, it is possible to suppress a decrease in the frequency band that can be used per channel by the number of small spatial regions that divide each cell.

(Embodiment 2) In this way, even if a reduction in the frequency band used per number of channels is ensured, in the case where bidirectional communication is performed, it is necessary to use both the base station for the uplink from the subscriber station and the base station. A frequency band for the downlink from the station to the base station is required separately, and the frequency band available for communication in a certain direction is reduced to about half. Therefore, a second embodiment will be described in which the same frequency band is repeatedly used while preventing interference for the uplink and the downlink. Also in the second embodiment, it is assumed that base stations are arranged and cells are set for each space formed between adjacent residential buildings as in the basic configuration described above. FIG. 3 shows the wall surface of the residential building A facing the cell 1 side of the above basic configuration. FIG.
As shown in FIG.
For each subscriber A1 (A1,...), A downlink base station 11 and a subscriber station 101, and an uplink base station 12 and a subscriber station 102 are separately provided, respectively.
This is different from the above basic configuration in that the direction in which the radio wave for the uplink is directed and the direction in which the radio wave for the downlink is directed are different from each other. In the second embodiment, the downlink base station 11 is arranged in the middle tier of the residential building A with the directional antenna directed horizontally. Also, the subscriber station 1 for the downlink line
Numeral 01 is arranged with the directional antenna facing the base station 11. On the other hand, the base station 12 for the uplink is in the residential building A
Are arranged with the directional antenna facing downward on the uppermost layer. Also, the subscriber station 102 for the uplink is arranged with a directional antenna facing the base station 12. Such base stations 11, 12 and subscriber stations 101, 102
Due to the arrangement, the direction of the radio wave for the downlink and the direction of the radio wave for the uplink are different from each other by 90 °, so that interference does not occur even if the same frequency band is repeatedly used for the uplink and the downlink. This eliminates the need to arrange the uplink and downlink in different frequency bands, and can further increase the frequency band available per channel.

(Embodiment 3) In Embodiment 2, the subscriber station and the base station are arranged so that the direction of the radio wave of the uplink and the direction of the radio wave of the downlink are different from each other, so that the channel can be used per channel. Although the frequency band was further increased, two cells bounded by a certain residential building were linked to the uplink using the fact that interference between multiple communications using the same frequency band was prevented for each cell. May be configured to be respectively used for wireless communication for downlink and wireless communication for downlink. FIG. 4 shows the configuration of the third embodiment.
In FIG. 4, two cells 1 and 2 bordering the residential building B are:
A downlink line and an uplink line are respectively set for the subscriber stations in the residential building B. For example, the residential building B is provided with subscriber stations 103, 104, 201, and 202. Among them, the subscriber station 103 and the subscriber station 201 are respectively used for a downlink and an uplink of a certain subscriber B1. The subscriber station 104 and the subscriber station 202 are subscriber stations for the downlink and uplink of the other subscriber B2, respectively. For subscribers B1 and B2 belonging to the residential building B, downlink is performed by communication from the base station 11 in the cell 1 to the subscriber stations 103 and 104 in the cell 1. On the other hand, for the subscribers B1 and B2 belonging to the residential building B, the uplink is transmitted from the subscriber stations 201 and 202 in the cell 2 to the cell 2
The communication is performed by the communication to the base station 22 located at. Although not shown, the base station 11 in the cell 1 and the base station 22 in the cell 2 are connected by a wired line using, for example, an optical fiber.
1 and B2 exchange information with respect to the wireless communication.
1, two-way communication can be performed between the base stations 22. Thereby, the subscriber B belonging to the residential building B
For 1 and B2, it is possible to prevent interference between a plurality of communications using the same frequency band while using the same frequency band for the uplink and the downlink. In the example of FIG. 4,
The cell 1 is used not only for the down line of the subscriber belonging to the residential building B, but also for the up line communication of the subscriber belonging to the residential building A, and the cell 2 is used only for the uplink line of the subscriber belonging to the residential building B. Instead, they are also used for downlinks of subscribers belonging to the residential building C, but since these communications have different directions of radio waves, interference is prevented even when the same frequency band is used. Here, if the technical idea according to the third embodiment is described, a base station is arranged for each of a plurality of communication space areas sharing a predetermined frequency band, and a plurality of subscriber stations belonging to each communication space area and In a wireless communication system that performs wireless communication with a base station in a communication space area,
In two communication space areas bounded by a certain building, a subscriber station and a base station are respectively provided corresponding to the subscriber belonging to the certain building, and corresponding to the subscriber station belonging to the certain building. The base station provided in each of the two communication space areas is connected to each other. In one communication space area, wireless communication is performed from the base station to the subscriber station with respect to a subscriber belonging to the certain building, and the other communication is performed. In the spatial area, wireless communication is performed from the subscriber station to the base station with respect to the subscriber belonging to the certain building, and information regarding the wireless communication of the subscriber belonging to the certain building is exchanged between the base stations in both communication spatial areas. Wireless communication system.

(Embodiment 4) Each embodiment can be implemented not only independently but also in combination. For example, a configuration of a fourth embodiment in which the configurations of the first embodiment and the second embodiment are combined will be described. Here, FIG. 5 illustrates a configuration of the wireless communication system according to the fourth embodiment. Example 4
In this case, as in the above-described basic configuration and each embodiment, it is assumed that a base station is arranged and a cell is set for each space formed between adjacent residential buildings. In FIG.
The wall surface of the residential building A facing the cell 1 side of the basic configuration is shown. As shown in FIG. 5, in the wireless communication system according to the fourth embodiment, the cell 1 is divided into a plurality of small space areas 1A and 1B, and each subscriber AA1 belonging to the small space area 1A.
For (AA1,...), A downlink base station 11 and a subscriber station 101, and an uplink base station 12 and a subscriber station 102 are separately provided and belong to the small space area 1B. For each subscriber AB1 (AB1,...), The base station 13 and the subscriber station 103 for the downlink, and
A downlink base station 14 and a subscriber station 1024 are separately provided, and in each of the small space areas 1A and 1B, the direction of the radio wave for the uplink and the direction of the radio wave for the downlink are determined. It differs from the above basic configuration in that it differs from each other. In the fourth embodiment, the base stations 11 and 13 for the downlink are arranged in the middle part of the residential building A with the directional antenna directed in the horizontal direction. The subscriber stations 101 and 103 for the downlink are arranged with the directional antennas facing the base station 11. On the other hand, the base station 12 for the uplink has the directional antenna directed downward to the uppermost layer of the residential building A, and the base station 14 for the uplink has the directional antenna directed upward to the lowermost layer of the residential building A, respectively. Are located. The subscriber stations 102 and 104 for the uplink are arranged with the directional antennas facing the base stations 12 and 14, respectively. Such base stations 11, 12, 1
3, 14 and subscriber stations 101, 102, 103, 104
The direction of the radio wave for the downlink and the direction of the radio wave for the uplink are different from each other by 90 °, and the direction of the radio wave is different for each adjacent small space area. Also, even if the same frequency band is repeatedly used for each small space area, interference is prevented.

(Embodiment 5) By the way, in the above-mentioned basic structure and each embodiment, a plurality of residential buildings are formed between adjacent residential buildings with respect to a group of buildings constructed in close proximity as described above. A base station is arranged in each space, and a boundary of a plurality of cells sharing a predetermined frequency band is set by the residential building, and a radio wave emitted in a certain cell is transmitted by the residential building at the boundary of the cell. The interference between a plurality of communications using the same frequency band was reduced. However, depending on the installation state of the base station and the subscriber station and the structure of the building, for example, radio waves may be transmitted through a glass window or the like and leak to other cells. As described above, in order to prevent the occurrence of interference due to overreach in which the radio wave of a certain cell unnecessarily reaches another cell, the direction of the radio wave from the base station of each cell to the subscriber station must be at least overreached. The wireless communication system may be configured so as to be different for each cell within the range. Here, the direction of the radio wave from the base station of each cell to the subscriber station, which is set for a group of buildings having the same shape (equivalent to a building) constructed in close proximity at the same interval, is set. FIG. 6 shows a configuration of the fifth embodiment in which each cell is different.
Shown in As shown in FIG. 6, most of radio waves emitted from the base station 61 using high-frequency radio waves having high rectilinearity are shielded by the building 6A and do not reach other cells. If the radio wave passes through the window, it may reach the subscriber station a in another cell. In order to prevent this, in the configuration according to the fifth embodiment, as shown in FIG. 6, the base station 61 is installed near the ground, whereas the base station 62 that originally provides the subscriber station a with the wireless communication service is provided. Is installed on the uppermost layer of the building 6A, and the directions of radio waves received from the base stations 61 and 62 are different between the subscriber station in the building 6A and the subscriber station in the building 6B. . In this case, even if the radio wave emitted from the base station 61 due to overreach reaches the subscriber station a in another cell, the base stations 61 and 62 are arranged so as to be shifted in the vertical direction. a is
Since the direction of the antenna is set in accordance with the arrangement of the base station 62, even if the subscriber station a receives a radio wave transmitted from the base station 61 and the base station 62 using the same frequency band, the intervening radio wave is received. Interference can be prevented. In addition, radio waves traveling straight from the base station 62 are transmitted to each of the buildings 6B and 6B.
There is a possibility that the signal may pass through the side wall of C and reach the subscriber station b belonging to another cell. Even in this case, the base station 62
And the base station 64 are shifted in the horizontal direction, and the subscriber station b
Is set in accordance with the arrangement of the base station 64, so that the radio waves transmitted from the base station 62 and the base station 64 using the same frequency band can be transmitted to the subscriber station B.
Can be prevented even during reception. In the fifth embodiment, a group of buildings in which buildings of the same shape are regularly arranged at the same interval is taken as an example. However, the present invention is not limited to this, and as shown in FIG. It is also possible to apply to a group of buildings in which buildings are irregularly arranged at different intervals. Further, in the above description, the term "base station" is used, but each base station can be replaced with a relay station that receives radio waves from a certain base station and relays the received content. In the conventional PMP multistage relay system in which radio waves are relayed by a plurality of relay stations, it is necessary to use different frequency bands in each relay station in order to prevent interference due to overreach. Although the number of stages was reduced as the number of stages increased, the present invention prevented interference between a plurality of communications using the same frequency band, thereby enabling effective use of the frequency band and increasing the number of relay stages. Thus, the cost of equipment and the like can be reduced. In the above embodiment, the example in which the building is a residential building has been described. However, the present invention is not limited to this.
For example, the present invention can be applied to a group of buildings in which factories and the like are in close proximity.

[0014]

As described above, according to the wireless communication system of any one of claims 1 to 7, a plurality of buildings are adjacent to a group of buildings constructed in close proximity. By arranging base stations in each space formed between the matching buildings, and setting boundaries of a plurality of communication space regions that share a predetermined frequency band with the buildings, the base station is provided for each communication space region. While repeatedly using the same frequency band, interference between a plurality of wireless communications using the same frequency band can be prevented. In addition, according to the wireless communication system of the third aspect, each communication space area is further divided into a plurality of small space areas, and the base station is arranged for each small space area, and each base station is arranged in each small space area. The base station and the base station are arranged such that the directions of radio waves of radio communication having directivity performed between the subscriber station to which the base station belongs and the base station in the small space area are different between adjacent small space areas. By disposing the subscriber station, the frequency band shared in each communication space area can be reused for each small space area while preventing interference. As a result, a high-speed wireless communication service can be provided even if the number of channels required in each communication space area increases. Further, the above claim 4
According to the wireless communication system described in (1), when performing bidirectional communication having directivity between the subscriber station and the base station,
Interference is prevented by arranging the base station and the subscriber station so that the direction of radio waves is different between the line from the subscriber station to the base station and the line from the base station to the subscriber station. Meanwhile, the same frequency band can be repeatedly used for the line from the subscriber station to the base station and the line from the base station to the subscriber station. Further, the above claims 5 to 7
According to the wireless communication system described in any one of the above, the direction of the radio wave transmitted from the base station (including the relay station) to the subscriber station is set at least within the reach of the radio wave for each communication space area. By making them different, even if there is a so-called over-reach where radio waves of wireless communication performed in a certain communication space area reach another communication space area, interference is prevented between a plurality of communication using the same frequency band. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of a wireless communication system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a schematic configuration of a wireless communication system according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a schematic configuration of a wireless communication system according to a second embodiment of the present invention.

FIG. 4 is a diagram illustrating a schematic configuration of a wireless communication system according to a third embodiment of the present invention.

FIG. 5 is a diagram illustrating a schematic configuration of a wireless communication system according to a fourth embodiment of the present invention.

FIG. 6 is a diagram illustrating a schematic configuration of a wireless communication system according to a fifth embodiment of the present invention.

FIG. 7 is a diagram illustrating a schematic configuration of another wireless communication system according to a fifth embodiment of the present invention.

[Explanation of symbols]

 1,2 ... cell 1A, 1B, 1C ... small space area 11,12 ... base station 101,102,103,104 ... subscriber station A, B, C ... building

Continuing from the front page (72) Inventor Yuichiro Goto 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel Works, Ltd. 1-5-5 Kobe Steel, Ltd. Kobe Research Institute (72) Inventor Yoshiro Nishimoto 1-5-5, Takatsukadai, Nishi-ku, Kobe, Hyogo Prefecture Kobe Steel, Ltd.Kobe Research Institute F-term (reference ) 5K067 AA03 AA11 BB02 BB21 EE06 EE10 EE43 EE54 EE61 GG01 GG11 KK02 5K072 AA04 AA12 BB12 BB25 DD16 GG02

Claims (7)

[Claims] A base station is arranged for each of a plurality of communication space areas sharing a predetermined frequency band, and a wireless communication is performed between a plurality of subscriber stations belonging to each communication space area and a base station in the communication space area. In a wireless communication system for performing communication, a base station is arranged in each space formed between adjacent buildings in a group of buildings in which a plurality of buildings are constructed in close proximity to each other. A wireless communication system characterized in that a boundary of each communication space area is set by the following. 2. The wireless communication system according to claim 1, wherein a part or all of the predetermined frequency band is repeatedly used for each communication space area. 3. The radio wave of wireless communication performed between the subscriber station and the base station has directivity, and each communication space area is further divided into a plurality of small space areas to form the base station. Arranged in each small space area, the direction of radio waves of wireless communication performed between a subscriber station belonging to each small space area and a base station in the small space area is set between adjacent small space areas. 3. The wireless communication system according to claim 2, wherein the base station and the subscriber station are arranged so as to be different from each other. 4. When performing bidirectional communication having directivity between the subscriber station and the base station, a line from the subscriber station to the base station and a line from the base station to the subscriber station are connected. The wireless communication system according to any one of claims 1 to 3, wherein the base station and the subscriber station are arranged such that directions of radio waves are different from each other. 5. The radio communication system according to claim 1, wherein the direction of radio waves transmitted from said base station to said subscriber station is made different for each communication space area at least within the range of radio waves. Wireless communication system. 6. The wireless communication system according to claim 5, wherein adjacent base stations in the communication space area are vertically shifted from each other. 7. The wireless communication system according to claim 5, wherein adjacent base stations in the communication space area are horizontally shifted from each other.