JP2011004162A - Area limited broadcast system by terrestrial digital broadcasting, and method for arranging transmission antenna used for the system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To narrow a dead zone regarding an area limited broadcast system by terrestrial digital broadcasting, and to provide a method for arranging a transmission antenna used for the system.SOLUTION: A limited area wider than a specific area is formed by providing at least one broadcast system for the specific area for transmitting unique information toward the specific area using one segment broadcasting in one area. In the limited area, a broadcast system for the limited area is provided in addition to the broadcast system for the specific area. Then, at least the transmission antenna provided to the system for the specific area is arranged so that a horizontal surface including a position where the transmission antenna is installed is always located at a lower part than a horizontal surface showing a position of a portable terminal at a use state than a horizontal surface including the position of the portable terminal at the use state in comparison of positions in the vertical direction between the transmission antenna and the portable terminal, and the transmission antenna is arranged so that a specific area information signal to be transmitted from the antenna is radiated upward. Moreover, all the systems perform transmission with the same frequency.

Description

The present invention relates to an area-limited broadcasting system that provides unique information to a specific area, and is particularly suitable for an area-limited broadcasting system configured using broadcasting using one segment in terrestrial digital broadcasting and the area-limited broadcasting system. The present invention relates to a method for arranging a transmitting antenna.

With the full-scale spread of digital terrestrial broadcasting, it has become possible not only to enjoy beautiful images and data broadcasts using high-definition video at home, but also to receive partial digital terrestrial broadcasts using portable terminals such as mobile phones, which have become very popular. Segment broadcasting can now be easily received, and video and data broadcasting can be enjoyed anytime and anywhere.
Under such circumstances, in recent years, area limited broadcasting systems that provide unique information other than terrestrial digital broadcasting to specific areas using one-segment broadcasting in this terrestrial digital broadcasting have been studied. Demonstration experiments have been conducted to send information limitedly to specific areas by obtaining licenses for experimental radio stations or using weak radio waves.
Conventionally, as this type of information system, there are an acquisition means for acquiring information used in a limited area as a broadcasting target, and a means for wirelessly transmitting a signal of the acquired information. There is known a system using a digital terrestrial broadcasting base station apparatus composed of transmission means for transmitting at a level that reaches the limited area using segment broadcasting (for example, Patent Documents). 1).

The area limited broadcasting system using the terrestrial digital broadcasting base station apparatus configured as described above is information such as event guidance and parking lot guidance outside such as large-scale theme parks and shopping streets that are examples of specific areas. If you apply it to a space where many exhibitors and shops gather, such as public facilities such as art museums and museums, exhibition halls and underground malls, etc. If you have a transmitting antenna on the wall near each object, you can broadcast commentary information using video and text data for each exhibit from the transmitting antenna, or exhibit your own information at exhibitions and underground shopping centers. If a shop or various stores have a transmission antenna on their booth or store walls, they can broadcast their own content. People who visit these venues can easily and quickly obtain a variety of information by using mobile terminals such as mobile phones that support 1-segment broadcasting (for example, non-patent literature) See 1. Press release document “Execution of public information system for 1-segment mobile phone using micro power radio waves”).

JP 2006-279376 A http: // www. soumu. go. jp / outsu / tokai / tool / kohosiryo /

However, in the area limited broadcasting system using the digital terrestrial broadcasting base station apparatus as in the prior art, the large-scale theme parks and shopping streets as described above, public facilities such as museums and museums, exhibition halls and underground shopping streets, etc. When broadcasting unique content that is different from digital terrestrial broadcasting to a limited area such as a space where many exhibitors and stores gather, comply with the Radio Law, etc. It should be arranged carefully so as not to adversely affect viewers who enjoy digital broadcasting, but for example, many exhibitors and stores such as the public facilities such as the above-mentioned museums and museums, exhibition halls and underground malls gather. In addition to distributing content to a limited area that is the entire venue, such as a space like this, a specific area within the limited area, that is, each area within the limited area When considering a broadcasting system that broadcasts content such as unique events and bargain information for each booth and exhibition booth, existing broadcasters and digital terrestrial broadcasting should be observed in compliance with the Radio Law as described above. Of course, it should be carefully arranged so as not to adversely affect viewers who can enjoy it. In addition, in order to receive both limited area broadcast systems and specific area broadcast systems, There was a problem that the system had to be arranged so that the dead band of radio waves was as narrow as possible.

In addition, depending on the installation situation of the stores and booths that constitute the specific area, a broadcasting system for the specific area provided in each store or the like is inevitably installed nearby. There has been a problem that the dead zone area of the radio wave that is expected to be generated due to interference must be arranged as narrow as possible.

As a method for solving these problems, there is a method of broadcasting by appropriately changing the transmission frequency (channel) for each base station apparatus, but it is said that the cost increases if the transmission means is configured so that the frequency can be changed. In addition to the problem, there was a problem that radio waves, which are limited assets, could not be used effectively. Also, from the standpoint of the receiver, there was a problem that it was troublesome because it was necessary to change the channel of the portable terminal or to scan again at a store or booth. To cope with this, a method of transmitting using the same frequency can be considered, but in this case, once the channel of the mobile terminal is set, it can be received seamlessly even if the store or booth is changed, which is convenient. However, as shown in Non-Patent Document 1, for example, in a system that transmits a limited information for a specific area by attaching a transmission antenna to the upper part of each wall surface of adjacent stores, etc., the presence of radio waves of the same frequency There was a problem that it was difficult to narrow down the dead zone caused by.

Further, as a method of narrowing the dead band area, for example, a method of sharpening the directivity of the transmission antenna provided in each base station apparatus is conceivable. In this case, from the standpoint of the installation side of the base station apparatus, the transmission antenna However, it has become a problem to install in a small store or booth because of the increase in cost and the cost, and the necessity of taking a large space for the installation site. On the other hand, from the standpoint of the receiving side, if an antenna with sharp directivity is used, it is possible that the receivable range will be extremely narrow, and as a result, the receivable location is limited and the location is not searched. There was a problem that said information could not be obtained.

Therefore, in this application, it was made to solve these problems.
The purpose is to provide a system capable of efficiently broadcasting region-limited information in an area-limited broadcasting system using one segment in terrestrial digital broadcasting.
Another object is to provide a system that can be configured easily and inexpensively in an area-limited broadcasting system using one segment in terrestrial digital broadcasting.
Another object is to provide a system suitable for a space such as an outdoor facility or an exhibition hall in an area-limited broadcasting system using one segment in terrestrial digital broadcasting.
Another object is to provide a transmission antenna suitable for an area limited broadcasting system using one segment in terrestrial digital broadcasting.

In order to solve the above-mentioned problem, the invention of claim 1 is provided with a base station apparatus for transmitting unique area information to a specific area using one segment by digital terrestrial broadcasting. In a method for arranging a transmission antenna used in an area-limited broadcasting system for a specific area configured to receive the area information transmitted from a transmission antenna that constitutes a mobile terminal,
At least, the base station apparatus uses a one-segment broadcast signal in terrestrial digital broadcasting to generate a specific area information signal used in a specific area that is limited, and the generated specific area information signal. A transmitting antenna configured to transmit toward the specific area, and having a transmission means for transmitting the specific area information signal at a predetermined level;
At least the transmission antenna that constitutes the transmission means has the transmission antenna installed from the horizontal plane that includes the position in the state of use of the mobile terminal in the comparison of the vertical position of the transmission antenna and the mobile terminal. The horizontal plane including the position is always positioned below the horizontal plane indicating the position of the mobile terminal in use, and the transmitting antenna is configured such that the specific area information signal transmitted from the antenna is It arranged so that it might radiate toward.

According to a second aspect of the present invention, in the method for disposing a transmitting antenna according to the first aspect, the transmitting antenna constituting the transmitting means is provided near an antenna section that radiates the specific area information signal and in the vicinity of the antenna section. A shielding material formed in a predetermined shape using the provided conductor material, and configured to include a shielding portion provided so that a surface thereof faces a radiation direction of the antenna portion;
At least, in the comparison of the vertical position of the antenna unit and the mobile terminal, the antenna unit has a horizontal plane that includes a position where the antenna unit is installed, rather than a horizontal plane that includes a position of the mobile terminal in use. The antenna unit is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the antenna unit radiates the specific area information signal transmitted from the antenna unit upward. Are arranged to
In the comparison of the horizontal position between the shielding unit and the portable terminal, the shielding unit is provided at a position where a plane formed by the shielding unit and a horizontal plane including a position in use of the portable terminal intersect. Arranged.

The invention of claim 3 includes a base station device for transmitting unique area information toward a specific area using one segment by digital terrestrial broadcasting, so that the area information transmitted from the base station device is obtained. In an area limited broadcasting system for a limited area wider than the specific area formed by providing at least one broadcast system for a specific area configured to be received by a mobile terminal in one area,
At least each of the base station devices provided for each specific area in the limited area generates a specific area information signal used in the limited specific area using a one-segment broadcast signal in digital terrestrial broadcasting. Comprising a signal generating unit and a transmitting antenna configured to transmit the generated specific area information signal toward the specific area, and transmitting the specific area information signal at a predetermined level;
At least, in the comparison of the vertical position of the transmission antenna and the mobile terminal, the transmission antenna has a horizontal plane that includes the position where the transmission antenna is installed, rather than a horizontal plane that includes the position of the mobile terminal in use. The transmitter antenna is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the transmitting antenna radiates the specific area information signal transmitted from the transmitter antenna upward. Prepared.

The invention of claim 4 includes a base station device for transmitting unique area information toward a specific area using one segment by terrestrial digital broadcasting, so that the area information transmitted from the base station device is obtained. In an area limited broadcasting system for a limited area wider than the specific area formed by providing at least one broadcasting system for a specific area configured to be received by a mobile terminal,
At least each of the base station devices provided for each specific area in the limited area generates a specific area information signal used in the limited specific area using a one-segment broadcast signal in terrestrial digital broadcasting A signal generating unit and a transmission antenna that transmits the generated specific area information signal toward the specific area, and includes a transmission unit that transmits the specific area information signal at a predetermined level,
The transmitting antenna constituting the transmitting means is an shielding part formed in a predetermined shape using an antenna part that radiates the specific area information signal and a conductor material provided in the vicinity of the antenna part. , And is configured to include a shielding portion provided so that its surface faces the radiation direction of the antenna portion,
At least, in the comparison of the vertical position of the antenna unit and the mobile terminal, the antenna unit has a horizontal plane that includes a position where the antenna unit is installed, rather than a horizontal plane that includes a position of the mobile terminal in use. The antenna unit is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the antenna unit radiates the specific area information signal transmitted from the antenna unit upward. Are arranged to
In the comparison of the horizontal position between the shielding unit and the portable terminal, the shielding unit is provided at a position where a plane formed by the shielding unit intersects a horizontal plane including a position in use of the portable terminal. .

According to a fifth aspect of the present invention, in the area limited broadcasting system according to any one of the third or fourth aspect, the specific area information signal used in the system is generated from information different for each specific area. Configured to be.

According to a sixth aspect of the present invention, in the area limited broadcasting system according to the fifth aspect, all the specific area information signals used in the system are transmitted at a predetermined level using radio waves of the same frequency. .

The invention according to claim 7 is the area limited broadcasting system according to any one of claim 5 or claim 6, wherein the system transmits the specific area information signal at a predetermined level toward each specific area. In addition to each of the base station devices for a specific area, the limited area includes a limited area information signal including information different from the specific area information signal for the specific area toward the entire limited area. Is configured to provide a limited area base station apparatus configured to transmit at a predetermined level using radio waves having the same frequency as the specific area information signal.

According to the first aspect of the present invention, a base station apparatus for transmitting unique area information toward a specific area using one segment by terrestrial digital broadcasting is provided. In a method for arranging a transmission antenna used in an area-limited broadcasting system for a specific area configured to receive the transmitted area information by a mobile terminal, at least the base station provided in the system By arranging the transmitting antenna that constitutes the device at a position below the mobile terminal in use, and radiating the specific area information signal upward, it becomes a specific area as in the prior art. Antennas are installed on the exhibition booths and store walls to radiate radio waves horizontally or slightly downward toward a specific area. Compared with the case where the radiated radio waves are reflected on the exhibition made of conductive materials, the surrounding exhibition booth or the store structure, etc., the reflected waves can be suppressed. It is possible to eliminate or narrow the area where the dead band of the radio wave generated by is generated.

Also, considering the condition that there are multiple specific areas with area-limited broadcasting systems for specific areas, antennas are installed on the walls of exhibition booths and stores as in the prior art, and radio waves are transmitted to specific areas. In the installation method that radiates horizontally or slightly downward, the dead zone area caused by the presence of radio waves leaking from different systems is considered to be the radiation direction of the radio waves (that is, the movement of visitors). In the embodiment of the present invention, the transmission antenna provided in the area limited broadcasting system for each specific area is expected to be formed so as to extend in the direction). In addition to the configuration in which the radiation direction of the specific area information signal is directed upward, the transmission antenna itself Due to the directional characteristics, even if a dead zone area occurs, the area is formed toward the ceiling rather than the horizontal direction (that is, the direction where there are no visitors). Without having to prepare, it is possible to obtain limited information for a specific area more easily than a conventional technology, more easily with a general-purpose portable terminal such as a mobile phone. .

Further, according to the invention of claim 2, in the invention of claim 1, by providing the transmitting antenna with a shielding portion, it is possible to limit the radiation range of the radio wave transmitted from the antenna and to change the use state. It is possible to prevent broadcast waves for other specific areas from jumping into a mobile terminal. Information for a specific area can be reliably received.

Further, according to the invention of claim 3 to claim 5, from the specific area formed by providing at least one broadcasting system for a specific area configured by using the transmitting antenna arrangement method having the above configuration. The above-mentioned effect can be expected even in an area-limited broadcasting system for a wide limited area, and visitors can easily and reliably acquire information on a specific area.

According to a sixth aspect of the invention, in the fifth aspect of the invention, the specific area information signals used in the system are all transmitted at a predetermined level using radio waves of the same frequency. In addition to the convenience that a visitor can easily and surely acquire limited information for a specific area with a general-purpose portable terminal such as a mobile phone, the visitor can specify Even if there are multiple areas, visitors can simply obtain information for each specific area by setting up a mobile device once (channel search only needs to be done once). it can.

Further, according to the invention of claim 7, in the invention of claim 5 or claim 6, in addition to the area limited broadcasting system for the specific area, an area limited broadcasting system for the limited area for the entire limited area is provided. In addition, the specific area information signal and limited area information transmitted from each system are configured to be transmitted at a predetermined level using radio waves of the same frequency, so that the visitors have their own For example, with a general-purpose portable terminal such as a mobile phone, it is possible to obtain limited information for a specific area in addition to information for a limited area more easily and more reliably than in the prior art. You can seamlessly obtain limited area information and information for each specific area for the entire area simply by setting the channel once (channel search only once). It can provide excellent system in handling property because it is possible.

It is the schematic which shows the structure of the area limited broadcasting system for specific areas which concerns on 1st Embodiment of this invention, and the arrangement | positioning state of the transmission antenna with which the said system is equipped. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining a specific use example of an area limited broadcasting system for a specific area according to the first embodiment of the present invention, and (a) shows the first embodiment in an exhibition hall as a limited area. It is the schematic which shows the example which provided the area limited broadcasting system for the specific area which concerns on a form in multiple places, (b) is the area limited broadcasting for the specific area which concerns on the said 1st Embodiment in the underground shopping area as a limited area. It is the schematic which shows the example which provided the system in multiple places. (A) is the schematic for demonstrating the area limited broadcasting system for limited areas which concerns on 2nd Embodiment of this invention, (a) is in the exhibition hall | area as a limited area, said 1st Embodiment. It is the schematic which shows the example which provided the broadcasting system for specific areas of the structure which concerns, and was provided with the broadcasting system for limited areas, (b) is a plurality of said 1st Embodiment in the underground shopping area as a limited area. It is the schematic which shows the example provided with the broadcasting system for limited areas while having the broadcasting system for specific areas of the structure concerning. These are the schematic diagrams for demonstrating in more detail the area limited broadcasting system which concerns on 2nd Embodiment of this invention, and are the perspective views which expanded the principal part of Fig.3 (a). These are the schematic diagrams for demonstrating a receiving area when the limited area broadcasting system and the specific area broadcasting system exist in the area limited broadcasting system which concerns on 2nd Embodiment of this invention. (A) is the schematic which shows the arrangement | positioning state of the transmission antenna in the area limited broadcasting system for specific areas of a prior art, (b) is for the specific area in the arrangement | positioning state of the transmission antenna shown by (a). It is explanatory drawing which showed typically the generation | occurrence | production state of the dead zone of an area limited broadcasting system. It is the schematic which expanded a part of area limited broadcasting system for specific areas which concerns on 3rd Embodiment of this invention, and is a specific structure of the area limited broadcasting system for specific areas which concerns on 3rd Embodiment of this invention It is the schematic for demonstrating. These are the schematic diagrams for demonstrating a receiving area in the area limited broadcasting system which concerns on 3rd Embodiment of this invention when the broadcasting system for limited areas and the broadcasting system for specific areas exist.

The configuration of an area limited broadcasting system for a specific area according to the first embodiment of the present invention will be described with reference to FIG. In this figure, 10a and 10b schematically show the sections of the exhibition booth that form the specific area, and the exhibition booth in the first embodiment is The front side is opened and the side surfaces 11 and 11 and the back surface 12 are partitioned by a partition or the like, so that a section is configured with a frontage of 6 m, a depth of 3 m, and a height of 2.5 m.
Then, to the exhibition booth 10a, which is this specific area, for transmitting unique area information to the exhibition booth 10a using one segment by terrestrial digital broadcasting according to the first embodiment of the present invention. A base station apparatus 1 is provided, and the specific area information transmitted from the base station apparatus 1 is converted into a mobile terminal 23 corresponding to broadcasting by one segment (the mobile terminal 23 described in the following description is a single segment). Although it is not specified that broadcasting is supported by, it is a one-segment broadcasting unless otherwise specified.

The base station apparatus 1 according to the first embodiment of the present invention includes a signal generation unit that generates a specific area information signal used in a specific area limited by using at least one segment broadcast signal in digital terrestrial broadcasting. 2 and a transmission antenna 3 that transmits the generated specific area information signal toward the specific area, and includes transmission means 5 that transmits the specific area information signal at a predetermined level. Yes. Note that other means such as specific area information acquisition means and input means used in the base station apparatus 1 provided in the exhibition booth 10a are not shown for the sake of simplicity.

The area limited broadcasting system according to the first embodiment of the present invention is characterized by the arrangement position of the transmission antenna 3 constituting the transmission means 5, and at least the transmission antenna 3 includes the transmission antenna 3 and the transmission antenna 3. In the comparison of the vertical position with the portable terminal 23, the horizontal plane including the position where the transmission antenna 3 is installed is always higher than the horizontal plane including the position when the portable terminal 23 is in use. The transmitting antenna 3 is disposed so that the specific area information signal transmitted from the antenna 3 radiates upward. Yes.
That is, when the visitor 22 with the portable terminal 23 visits the exhibition booth 10a, the specific area information signal radiated upward from the transmitting antenna 3 disposed at a position below the portable terminal 23 is The system is configured so that it can be received by the portable terminal. In order to satisfy the above condition, in the embodiment shown in this figure, the transmitting antenna 3 is disposed so as to be housed in a housing space 13a formed on the floor surface 13 of the exhibition booth 10a.
In this embodiment, the transmitting antenna 3 is arranged on the floor 13 of the exhibition booth 10a. However, the transmitting antenna 3 is located below the mobile terminal 23 in use so that radio waves can be emitted upward. However, the present invention is not limited to the embodiment, for example, it is housed inside an exhibition stand (not shown). Further, the transmitting antenna 3 shown in the figure is an example, and for example, an antenna formed in a planar shape so as to be easily installed on the floor surface 13 may be used. In consideration of the area and the like, an antenna having a shape that is not so sharp is desirable.

Here, a specific example of the area limited broadcasting system for the specific area configured as described above will be described with reference to FIG. This figure shows an example in which at least one area-limited broadcasting system for a specific area according to the first embodiment is provided in one area (hereinafter referred to as a limited area). FIG. ) Is a schematic diagram showing an example in which the predetermined exhibition booths 10a and 10n in the exhibition hall 100 as the limited area are provided with the area limited broadcasting system for the specific area according to the first embodiment. (B) is the schematic which shows the example which provided the area limited broadcasting system for the specific areas which concerns on the said 1st Embodiment in the predetermined store 20a ... 20n in the underground shopping center 200 as the said limited area. In the exhibition booth or store each having an area-limited broadcasting system for a specific area, the system is configured so that the mobile terminal 23 can acquire and acquire unique content for the specific area emitted from the transmission means 5. ing. In addition, the circle shown by the chain line shown by 5a in the figure schematically shows the radiation pattern of the radio wave for a specific area.
Then, as shown in FIG. 2, the area limited broadcasting system in the first embodiment of the present invention includes a plurality of area limited broadcasting systems for a specific area in the limited area. Are configured to broadcast different contents using the same frequency. As a result, the visitor 22 once performs a channel scan of the portable terminal 23, without changing the channel, to any exhibition booth or store equipped with an area limited broadcasting system for a specific area within the limited area. Even if it is, it is possible to obtain unique information seamlessly.

As described above, according to the area-limited broadcasting system for the specific area in the first embodiment of the present invention, at least the mobile terminal that is in the use state of the transmission antenna 3 that constitutes the base station apparatus 1 provided in the system is used. In addition to being arranged at a position below 23 and radiating a specific area information signal upward, an antenna is installed on the wall of an exhibition booth or a store as in the prior art, and radio waves are transmitted. Compared to the case of radiating horizontally or slightly downward toward a specific area, the reflected waves generated by the reflected radio waves reflected on exhibits made of conductive materials, surrounding exhibition booths, store structures, etc. The area where the dead band of the radio wave generated by the presence of the direct wave and the reflected wave is generated can be eliminated or reduced (especially in the exhibition). As the venue, which is of course suitable for high ceiling building.).

Also, considering the condition that there are multiple specific areas with area-limited broadcasting systems for specific areas as shown in Fig. 2, antennas are installed on the walls of exhibition booths and stores as in the prior art. In the installation method in which radio waves are radiated horizontally or slightly downward toward a specific area, the dead zone area caused by the presence of radio waves leaking from different systems is That is, it is expected to be formed so as to extend toward the movement direction of the visitor 20, and the area where reception failure occurs is widened, whereas in the embodiment of the present invention, an area limited broadcasting system for each specific area The transmission antennas 3 provided in the above are configured so that the radiation direction of the specific area information signal is directed upward, respectively, Even if the dead zone area is generated due to the directivity characteristic of the signal antenna 3 itself, the generated area is formed toward the ceiling direction (that is, the direction in which the visitor 22 does not exist) rather than the horizontal direction. Can obtain limited information for a specific area more easily than a conventional technology, without having to prepare a special mobile terminal, with a general-purpose mobile terminal such as the mobile phone 23 It will be possible.

Next, a second embodiment of the present invention will be described with reference to FIG. First, there is a difference between the area limited broadcasting system for a specific area according to the second embodiment of the present invention and the area limited broadcasting system for a specific area having the above configuration. In the second embodiment of the present invention, in addition to providing at least one broadcasting system for a specific area having the configuration according to the first embodiment in a limited area, the limited area broadcasting system for the limited area is provided. In FIG. 3A, at least one broadcasting system for a specific area having the configuration according to the first embodiment is provided in the exhibition hall 100 as the limited area, and for the limited area. FIG. 5B is a schematic diagram showing an example in which a broadcasting system is provided, and (b) includes at least one specific area broadcasting system having the configuration according to the first embodiment in the underground shopping area 200 as the limited area, It is the schematic which shows the example which provided the broadcasting system also for limited areas. In order to simplify the following description, the same reference numerals are given to the same components as those in the first embodiment, and detailed description thereof is omitted.
In FIG. 3, reference numeral 50 denotes a transmission unit constituting the base station apparatus 1 for the limited area. The transmission unit 50 has unique information for the limited area that is different from the limited information for the specific area. Configured to be serviced. And the ellipse shown with the dashed-dotted line shown by 50a in FIG. 3 shows the radiation pattern of the electromagnetic wave with respect to a limited area typically.

The area-limited broadcasting system having such a configuration can be expected to be used as follows. That is, the area-limited broadcasting system for the limited area broadcasts information such as event information, parking lot information, and transportation information to the entire venue by image or text data, whereas The area limited broadcasting system allows each exhibition booth 10a, 10n and each store 20a,... 20m, 20n to broadcast unique content different from information for a limited area by image or text data. It becomes.
Moreover, in the area limited broadcasting system according to the second embodiment of the present invention, the area limited broadcasting system for the limited area and the area limited broadcasting system for the specific area transmit using the same frequency, so that the first As in the embodiment, information for a limited area and information for a specific area can be obtained seamlessly.

The movement of the visitor 22 at this time will be described in more detail with reference to FIGS. FIG. 4 is an enlarged view of the main part (exhibition booth 10a) of FIG. 3 (a) in order to explain the area limited broadcasting system according to the second embodiment of the present invention in more detail. It is the perspective view which fractured | ruptured a part of back 12 of the exhibition booth 10a seen from the arrow RV.
When the visitor 22 walking while receiving the area limited broadcast for the limited area 100 with the portable terminal 23 stops at the exhibition booth 10a along the arrow WL shown in FIGS. The terminal 23 can receive the specific area information transmitted from the transmission means 5 provided in the exhibition booth 10a seamlessly without changing the setting of the portable terminal 23, and in addition to the information for the limited area, the exhibition Information unique to the meeting booth 10a can be easily obtained.
In FIG. 4, reference numeral 53 denotes a schematic view for indicating a “horizontal plane including the position of the portable terminal in use” according to the claims. As shown in FIG. 4, the “horizontal plane including the position where the transmitting antenna is installed” described in the claims is the floor surface 13.

FIG. 5 illustrates a broadcast reception area and a dead zone area for a specific area in the exhibition booth 10a obtained by calculation in the area limited broadcasting system according to the second embodiment of the present invention.
Specifically, from the experimentally obtained results, the transmission means 50 in the limited area broadcasting system transmits the signal in the limited area broadcasting system in comparison with the radio field strength of the limited area broadcasting system. The difference between the strength of the radio wave and the strength of the radio wave transmitted from the transmission means 5 in the broadcasting system for the specific area is 6 dB or more (the strength of the radio wave of the broadcasting system for the limited area> the strength of the radio wave of the broadcasting system for the specific area. For better reception, it is desirable that the difference in electric field strength is 10 dB or more.) A receivable area 100a and an unreceivable area where the difference in radio wave intensity is less than 6 dB (both radio waves cannot be received). ) Is a dead zone area 101a generation area.
In the second embodiment of the present invention, the radio wave radiated from the transmission means 50 constituting the limited area broadcasting system for the limited area is horizontally polarized with respect to the visitor 22, and is directed to the specific area. By changing the arrangement direction of each antenna so that the radio waves radiated from the transmission means 5 constituting the area-limited broadcasting system of the above will be radiated as vertically polarized waves, the discrimination degree of both polarized waves is improved. Yes.

Here, the generation state of the reception area and the dead zone area according to the prior art will be described with reference to FIG. In FIG. 6, (a) is a schematic diagram showing an arrangement state of transmission antennas in an area-limited broadcasting system for a specific area according to the prior art, and A in which a transmission antenna 3a is provided on the back surface 12 of the exhibition booth 10a. An example and B example in which the transmission antenna 3a is provided on the side surface 11 of the exhibition booth 10a are shown. (B) is explanatory drawing which showed typically the generation | occurrence | production state of the dead zone of the area limited broadcasting system for the specific areas in the A example and B example which are the arrangement | positioning states of the transmission antenna shown by (a).
As can be seen from this figure, in the A and B examples where the transmission antenna is installed as in the prior art, the dead zone area (area A and area B indicated by the one-dot chain line in the figure) is wide in the radial direction of the transmission antenna. In comparison of these figures, it can be seen that the dead zone area can be narrowed by the arrangement method of the transmission antenna 3 according to the embodiment of the present invention.

As described above, in the area limited broadcasting system according to the second embodiment of the present invention, the transmission means for the limited area is configured to radiate radio waves in a substantially horizontal direction so as to cover the entire venue. On the other hand, the transmission antenna 3 constituting the transmission means 5 provided in the area limited broadcasting system for a specific area radiates the specific area information signal upward from the lower position of the portable terminal 23 in the use state. In addition to the above configuration, even if the dead zone area is generated due to the directivity characteristic of the transmitting antenna 3 itself, the main generation area is in the ceiling direction (that is, the direction in which no visitor 22 exists) rather than the horizontal direction. So that the visitor 22 takes it with a general-purpose portable terminal such as a mobile phone 23 Simple and reliable information for a specific area in addition to the information for a specific area can be obtained more reliably than in the prior art, and both information can be obtained at the same frequency. Since it is possible to obtain information seamlessly by setting once, a system with excellent convenience can be provided.

Next, a third embodiment of the present invention will be described with reference to FIGS. The area limited broadcasting system for limited areas according to the third embodiment of the present invention is a different example of the area limited broadcasting system for limited areas in the second embodiment of the second embodiment, and is a dead zone area than the above configuration. The purpose of this is to further narrow the occurrence of. In these drawings, FIG. 7 is an enlarged schematic view of a part of the exhibition booth 30a which is a specific area provided in the area limited broadcasting system for limited areas according to the third embodiment of the present invention. It is a figure for demonstrating the specific structure of the specific area limited broadcasting system with which the meeting booth 30a was equipped. In this embodiment as well, the same components as those in the above embodiment are given the same reference numerals, and detailed description thereof is omitted.

This will be described in more detail. The transmitting antenna 3 constituting the transmitting means 5 of the third embodiment has a predetermined shape using an antenna portion 33a that radiates the specific area information signal and a conductor material provided in the vicinity of the antenna portion 33a. The shielding member 33 is provided with a shielding part 33b provided so that its surface faces the radiation direction of the antenna part. At least the antenna part 33a is configured as the transmitting antenna 3 having the above-described configuration. Similarly, in the comparison of the vertical position of the antenna unit 33a and the portable terminal 23, the horizontal plane including the position where the antenna unit 33a is installed is more than the horizontal plane including the position in the use state of the portable terminal. The antenna unit 33a is always disposed below the horizontal plane indicating the position of the mobile terminal 23 in use. The specific area information signal transmitted from antenna unit 33a is disposed so as to emit upward.
Further, the shielding part 33b, which is a newly added member, is used in the comparison of the horizontal position between the shielding part 33b and the mobile terminal 23, and the use state of the mobile terminal 23 and the plane formed by the shielding part 33b. Is disposed at a position such that the horizontal planes including the position intersect.

Specifically, as well shown in FIG. 7, the shielding portion 3b according to the third embodiment of the present invention uses the materials of the side walls 11 and 11 and the back surface 12 separating the exhibition booth 30a as conductors. The shielding part 3a is configured to include a shielding material formed in a predetermined shape using a conductive material inside a partition formed of a material or a veneer material. In addition to limiting the radiation range of the radio wave transmitted from the antenna unit 33a, the mobile terminal 23 in use is configured not to receive broadcast waves for other specific areas.
The shielding portion 3b may be made of a thin plate material such as a metal foil, and has a mesh that can shield a signal radiated from the antenna portion 33a (in the present invention, a signal in the UHF band). A mesh-like member may be used. Further, in this embodiment, the example in which the shielding portions 33b are provided on all the side surfaces 11, 11 and the back surface 12 of the exhibition booth 30a is shown, but the present invention is not particularly limited to this embodiment, and the exhibition booth. Depending on the arrangement position, the position where the shielding portion 33b is provided may be limited. Moreover, although the magnitude | size of the shielding part 33b in embodiment of this invention showed the example matched with the magnitude | size of the both sides | surfaces 11 and 11 and the back surface 12 of the exhibition booth 30a, the magnitude | size is especially limited to an Example. For example, the size and the installation position may be determined so as to match the directivity characteristics of the transmission antenna.

Next, the reception area and dead zone area generated in the third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic diagram for explaining a reception area when a limited area broadcasting system and a specific area broadcasting system exist in the area limited broadcasting system according to the third embodiment of the present invention. The figure shows the 30a reception area and deadband area obtained by calculation.
Specifically, it is transmitted from the transmission means 50 in the limited area broadcasting system based on experimental results obtained by comparing the radio field strength of the limited area broadcasting system with the radio field intensity of the specific area broadcasting system. The difference between the strength of the radio wave and the strength of the radio wave transmitted from the transmission means 5 in the broadcasting system for the specific area is 6 dB or more (the strength of the radio wave of the broadcasting system for the limited area> the strength of the radio wave of the broadcasting system for the specific area. For better reception, the difference in electric field strength is preferably 10 dB or more.) A receivable area 110a and a non-receivable area where the difference in radio wave intensity is less than 6 dB (both radio waves cannot be received). ) Is a dead zone area 111a.

As can be clearly seen from this figure, according to the third embodiment of the present invention, the transmitting antenna constituting the transmitting means 5 includes an antenna portion 3a and a conductor material provided in the vicinity of the antenna portion 3a. A shielding material formed into a predetermined shape by using a shielding member 3b provided so that its surface faces the radiation direction of the antenna unit 3a, and at least the antenna unit 3a. Is a horizontal plane that includes the position where the antenna unit 3a is installed, compared to the horizontal plane that includes the position of the mobile terminal 23 in use in comparison of the vertical position of the antenna unit 3a and the mobile terminal 23. The antenna unit 3a is always disposed below the horizontal plane indicating the position of the mobile terminal 23 in use, and the antenna unit 3a is transmitted from the antenna unit 3a. The specific area information signal is arranged to radiate upward, and further, the shielding unit 3b is configured to compare the shielding unit 3b and the portable terminal 23 in the horizontal position. The dead zone area 111a generated by the configuration of the third embodiment of the present invention by arranging the plane formed by the portion 3b and the horizontal plane including the position of the portable terminal 23 in use is shown in FIG. It can be seen that the dead zone area 101a generated by the configuration of the second embodiment shown in FIG.

Note that, as exemplified below, the present invention can be implemented by appropriately changing the configuration of each part without departing from the spirit of the present invention.
In the embodiment of the present invention, the radio wave radiated from the transmission means 50 constituting the area limited broadcasting system for the limited area is horizontally polarized with respect to the visitor 22, and the area limited broadcasting system for the specific area. Although the radio wave radiated from the transmission means 5 constituting the radiating unit is configured to radiate with vertical polarization, it may be arranged according to the directivity characteristics of the transmission antenna, and is particularly limited to this embodiment. is not.
Further, when the transmission antenna 3 is installed in the embodiment of the present invention, the center line of the directivity characteristic of the transmission antenna is arranged so as to be vertically upward with respect to the horizontal plane including the position where the transmission antenna 3 is installed. Although an example is shown, the radiation direction of radio waves may be shifted depending on the situation of a specific area.

DESCRIPTION OF SYMBOLS 1 ... Base station apparatus, 2 ... Signal generation part, 3 ... Transmission antenna, 3a ... Transmission antenna, 3b ... Transmission antenna (prior art), 5 ... Transmission means (for specific areas), 5a ... Radiation pattern (specific area), 6 ..., 7 ..., 8 ..., 9 ..., 10 ... Exhibition booth (10a ... 10n), 11 ... Side, 12 ... Back, 13 ... Floor, 13a ... Storage space, 20 ... Store (20a ... 20n), 22 ... visitors, 23 ... mobile terminal, 30 ... exhibition booth (30a, 30b), 31 ... side, 32 ... back, 33a ... antenna part, 33b ... shielding part, 50 ... transmitter (limited area) ), 50a ... radiation pattern (limited area), 53 ... horizontal plane indicating the position of the mobile terminal, 100 ... exhibition hall, 100a ... receivable area (second embodiment), 101a ... dead area (second embodiment), 110a ... reception Function Area (Third Embodiment), 111a ... play area (third embodiment), 200 ... underground mall.

Claims (7)

By providing a base station apparatus for transmitting unique area information toward a specific area using one segment based on terrestrial digital broadcasting, the area information transmitted from a transmission antenna constituting the base station apparatus is stored in a portable terminal. In a method for arranging a transmitting antenna used in an area-limited broadcasting system for a specific area configured to be received by
At least, the base station apparatus uses a one-segment broadcast signal in terrestrial digital broadcasting to generate a specific area information signal used in a specific area that is limited, and the generated specific area information signal. A transmission antenna configured to transmit toward the specific area, and having a transmission means for transmitting the specific area information signal at a predetermined level;
At least the transmission antenna that constitutes the transmission means has the transmission antenna installed from the horizontal plane that includes the position in the state of use of the mobile terminal in the comparison of the vertical position of the transmission antenna and the mobile terminal. The horizontal plane including the position is always positioned below the horizontal plane indicating the position of the mobile terminal in use, and the transmitting antenna is configured such that the specific area information signal transmitted from the antenna is A method of arranging a transmitting antenna used in an area limited broadcasting system, characterized in that the antenna is arranged to radiate toward the area.
The transmitting antenna constituting the transmitting means is an shielding part formed in a predetermined shape using an antenna part that radiates the specific area information signal and a conductor material provided in the vicinity of the antenna part. , And is configured to include a shielding portion provided so that its surface faces the radiation direction of the antenna portion,
At least, in the comparison of the vertical position of the antenna unit and the mobile terminal, the antenna unit has a horizontal plane that includes a position where the antenna unit is installed, rather than a horizontal plane that includes a position of the mobile terminal in use. The antenna unit is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the antenna unit radiates the specific area information signal transmitted from the antenna unit upward. Are arranged to
The shielding unit is provided at a position where a plane formed by the shielding unit and a horizontal plane including a position in use of the portable terminal intersect each other in comparison of horizontal positions of the shielding unit and the portable terminal. The method for arranging a transmitting antenna according to claim 1, wherein the transmitting antenna is used in an area limited broadcasting system.
By providing a base station apparatus for transmitting unique area information toward a specific area using one segment by terrestrial digital broadcasting, the area information transmitted from the base station apparatus is received by a mobile terminal. In an area limited broadcasting system for a limited area wider than the specific area formed by providing at least one broadcast system for a specific area configured in one area,
At least each of the base station devices provided for each specific area in the limited area generates a specific area information signal used in the limited specific area using a one-segment broadcast signal in digital terrestrial broadcasting. Comprising a signal generating unit and a transmitting antenna configured to transmit the generated specific area information signal toward the specific area, and transmitting the specific area information signal at a predetermined level;
At least, in the comparison of the vertical position of the transmission antenna and the mobile terminal, the transmission antenna has a horizontal plane that includes the position where the transmission antenna is installed, rather than a horizontal plane that includes the position of the mobile terminal in use. The transmitter antenna is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the transmitting antenna radiates the specific area information signal transmitted from the transmitter antenna upward. An area-limited broadcasting system characterized by being equipped with
By providing a base station apparatus for transmitting unique area information toward a specific area using one segment by terrestrial digital broadcasting, the area information transmitted from the base station apparatus is received by a mobile terminal. In an area limited broadcasting system for a limited area wider than the specific area formed by providing at least one broadcasting system for a specific area configured,
At least each of the base station devices provided for each specific area in the limited area generates a specific area information signal used in the limited specific area using a one-segment broadcast signal in terrestrial digital broadcasting A signal generating unit and a transmission antenna that transmits the generated specific area information signal toward the specific area, and includes a transmission unit that transmits the specific area information signal at a predetermined level,
The transmitting antenna constituting the transmitting means is an shielding part formed in a predetermined shape using an antenna part that radiates the specific area information signal and a conductor material provided in the vicinity of the antenna part. , And is configured to include a shielding portion provided so that its surface faces the radiation direction of the antenna portion,
At least, in the comparison of the vertical position of the antenna unit and the mobile terminal, the antenna unit has a horizontal plane that includes a position where the antenna unit is installed, rather than a horizontal plane that includes a position of the mobile terminal in use. The antenna unit is always disposed below the horizontal plane indicating the position of the mobile terminal in use, and the antenna unit radiates the specific area information signal transmitted from the antenna unit upward. Are arranged to
The shielding unit is provided at a position where a plane formed by the shielding unit and a horizontal plane including a position in use of the portable terminal intersect each other in comparison of horizontal positions of the shielding unit and the portable terminal. An area-limited broadcasting system characterized by
5. The area limited broadcasting system according to claim 3, wherein the specific area information signal used in the system is generated from information different for each specific area.
6. The area limited broadcasting system according to claim 5, wherein all the specific area information signals used in the system are configured to transmit at a predetermined level using radio waves of the same frequency.
  The system includes the base station device for a specific area that transmits the specific area information signal at a predetermined level toward each specific area. In addition, the limited area includes the entire limited area. On the other hand, the limited area information signal composed of information different from the specific area information signal for the specific area is transmitted at a predetermined level using radio waves having the same frequency as the specific area information signal. The area limited broadcasting system according to claim 5, wherein the base station apparatus is provided.

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