JP5457082B2 - Area-limited broadcasting system using digital terrestrial broadcasting - Google Patents

Description

The present invention relates to an area limited broadcasting system that provides unique information to a specific area, and more particularly to an area limited broadcasting system that performs broadcasting using one segment in terrestrial digital broadcasting .

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.

The invention according to claim 1, which has been made to solve the above-described problem, includes a base station device for transmitting unique area information toward a specific area using one segment by terrestrial digital broadcasting. In an area limited broadcasting system for a specific area configured to receive the area information transmitted from a transmitting antenna constituting a base station device by 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 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;
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, It is configured to include a shielding part provided so that its surface faces the radiation direction of the antenna part,
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. It is characterized by.

Next, the invention according to claim 2 is transmitted from the base station apparatus by providing a base station apparatus for transmitting unique area information toward a specific area using one segment by digital terrestrial broadcasting. In the area limited broadcasting system for a limited area wider than the specific area formed by providing at least one broadcast system for the specific area configured to receive the area information 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. It is characterized by that.

Further, the invention according to claim 3, in an area-limited broadcast system according to claim 2, wherein the specific area information signals used for the system, which are generated from different information for each specific area Features.

According to a fourth aspect of the present invention, in the area limited broadcasting system according to the third aspect , all the specific area information signals used in the system are transmitted at a predetermined level using radio waves of the same frequency. It is configured as described above .

The invention according to claim 5 is the area limited broadcasting system according to claim 3 or claim 4 , wherein the system transmits a specific area information signal at a predetermined level toward each specific area. In addition to each of the base station devices for the 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. The base station apparatus for a limited area configured to transmit at a predetermined level using a radio wave having the same frequency as that of the specific area information signal is provided .

According to the first aspect of the present invention, the base station apparatus includes a base station apparatus for transmitting unique area information toward a specific area using one segment based on digital terrestrial broadcasting. In an area-limited broadcasting system for a specific area configured to receive the area information transmitted from an antenna by a mobile terminal , at least an antenna unit of a transmitting antenna constituting the base station apparatus provided in the system However, it is arranged at a position below the portable terminal in use and is arranged so as to radiate the specific area information signal upward .
Therefore, compared to the case where an antenna is installed on the wall of an exhibition booth or store as a specific area as in the prior art, the radiated radio wave is more conductive than when radiating the radio wave horizontally or slightly downward toward the specific area. Reflected waves caused by reflections on material exhibits, surrounding exhibition booths, store structures, etc. can be suppressed, eliminating the area where the dead zone of radio waves caused by the presence of direct waves and reflected waves is generated. Or narrow.

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). It is expected to be formed to extend in the direction), and the area where reception failure occurs is widened .
In contrast, in the present invention, the antenna portion of the transmitting antenna which gave provided in area-limited broadcast system each for a specific area, in addition to having the structure described respectively toward the radial direction of the specific area information signal upwardly, the antenna Even if a dead zone area occurs due to the directivity characteristics of the part itself, the area is formed toward the ceiling rather than the horizontal direction (that is, the direction in which no visitors exist). Without having to prepare a mobile terminal, it is easy to hold it with a general-purpose mobile terminal that you have, for example, a mobile phone, and to acquire limited information for a specific area more reliably than with the prior art It becomes.

In addition, according to the first aspect of the present invention, by providing the transmitting antenna with the shielding portion, it is possible to limit the radiation range of the radio wave transmitted from the antenna, and to the mobile terminal in use, Broadcast waves for other specific areas can be prevented from jumping in. Information for a specific area can be reliably received.

Further according to the invention described in claim 2, even small without the area-limited broadcast system disclosed in Japanese for a constant area of claim 1 Ru is formed by providing one location, wide limits area for than the specific area In the area limited broadcasting system, the above effect can be expected, and the visitor can easily and surely acquire information on the specific area.

According to the invention described in claim 4, in the area limited broadcasting system according to claim 3, the specific area information signals used in the system are all at a predetermined level using radio waves of the same frequency. By configuring to send, visitors can easily and reliably acquire limited information for a specific area with a general-purpose portable terminal such as a mobile phone. In addition to convenience, even if there are multiple specific areas, visitors can seamlessly obtain information for each specific area by simply setting the mobile terminal once (channel search only once). An excellent system can be provided.

Further, according to the invention described in claim 5, in the area limited broadcasting system according to claim 3 or 4, in addition to the area limited broadcasting system for a specific area, the area limited broadcasting for the entire limited area By providing an area-limited broadcasting system, and the specific area information signal and the limited area information transmitted from each system are all transmitted at a predetermined level using radio waves of the same frequency, Can be obtained with a general-purpose portable terminal, such as a mobile phone, that it has, and can acquire limited information for a specific area in addition to the information for a limited area more easily and reliably than the prior art. In addition, visitors can set the mobile terminal once (channel search only once), and the limited area information and specific area for the entire area. It is possible to obtain information of Agoto seamlessly can provide a system excellent in handling properties.

It is the schematic which shows the structure of the area limited broadcasting system for the specific areas of the reference example 1 used as the premise of this invention, and is the schematic which shows the arrangement | positioning state of the transmission antenna with which the said system is equipped. Is a schematic diagram for explaining a specific use example of the area-limited broadcast system for specific areas of Reference Example 1, (a) a plurality of area-limited broadcasting system exhibition halls for specific areas of limitation area it is a schematic diagram showing an example which gave equipped location, (b) is a schematic diagram showing an example which gave comprising a plurality of locations of the area-limited broadcast system disclosed in Japanese for constant area underground mall as limiting area. It is a schematic diagram for explaining the area-limited broadcast systems for limiting the area of Reference Example 2 as a premise of the present invention causes a plurality of (a) broadcast system for a specific area in the exhibition hall as limited area with a schematic diagram showing an example which gave comprising a broadcast system for limited areas, (b) is provided with a specific area for broadcasting system in an underground mall as limiting area was allowed with a broadcast system for limiting the area It is the schematic which shows an example. It is the schematic for demonstrating in more detail the area limited broadcasting system of the reference example 2, and is the perspective view which expanded the principal part of Fig.3 (a). In the area limited broadcast system of the reference example 2, it is a schematic diagram for demonstrating a reception area when the limited area broadcast system and the specific area broadcast system exist. (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 of embodiment of this invention, and is a schematic diagram for demonstrating the specific structure of the area limited broadcasting system for specific areas of this embodiment . is there. It is a schematic diagram for demonstrating a receiving area when the broadcast system for limited areas and the broadcast system for specific areas exist in the area limited broadcast system of embodiment of this invention .

The configuration of an area-limited broadcasting system for a specific area according to Reference Example 1, which is a premise of the present invention , will be described with reference to FIG. 10a In this figure, is shown by 10b, by paying attention to a section of the exhibition booth forming a specific area have the meanings indicated schematically, exhibition booth definitive in Reference Example 1, the front respectively By opening the sides and partitioning the side surfaces 11 and 11 and the back surface 12 by a partition or the like, a section is configured with a frontage of 6 m, a depth of 3 m, and a height of 2.5 m.
Then, in the exhibition booth 10a this is a specific area, with one segment by terrestrial digital broadcasting is provided with a base station apparatus 1 to transmit the own area information toward the exhibition booth 10a , The specific area information transmitted from the base station apparatus 1 is converted into the mobile terminal 23 corresponding to broadcasting by one segment (the mobile terminal 23 described in the following description is not clearly described as being compatible with broadcasting by one segment, The area limited broadcasting system is constructed so that it can be received by 1-segment broadcasting unless otherwise specified.

The base station apparatus 1 according to the first reference example includes at least the signal generation unit 2 that generates a specific area information signal used in a specific area limited by using a broadcast signal of one segment in terrestrial digital broadcasting. The transmission antenna 3 is configured to transmit the specific area information signal toward the specific area, and includes transmission means 5 that transmits the specific area information signal at a predetermined level. 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 of Reference Example 1 is characterized by the location of the transmission antenna 3 that constitutes the transmission means 5, and at least the transmission antenna 3 includes the transmission antenna 3, the portable terminal 23, and the like. In comparison of the vertical position, the horizontal plane including the position where the transmitting antenna 3 is installed always indicates the position of the mobile terminal 23 in use, rather than the horizontal plane including the position of the mobile terminal 23 in use. The transmitting antenna 3 is disposed so as to be positioned below a horizontal plane, and the specific area information signal transmitted from the antenna 3 is radiated upward.
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 reference example 1 shown in this figure, the transmitting antenna 3 is disposed so as to be housed in a housing space 13a formed on the floor 13 of the exhibition booth 10a. .
In the first reference example , the transmitting antenna 3 is disposed on the floor 13 of the exhibition booth 10a. However, the transmitting antenna 3 is located below the mobile terminal 23 in use and can emit radio waves 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 in Reference Example 1 is provided in one area (hereinafter referred to as a limited area), and FIG. FIG. 2B is a schematic diagram showing an example in which predetermined area booths 10a and 10n in the exhibition hall 100 as the limited area are provided with an area limited broadcasting system for a specific area of Reference Example 1 , and FIG. It is the schematic which shows the example which provided the area limited broadcasting system for the specific areas of the reference example 1 in the predetermined store 20a ... 20n in the underground shopping center 200 as a 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.
As shown in FIG. 2, in the area limited broadcasting system of Reference Example 1, when a plurality of area limited broadcasting systems for a specific area are provided in the limited area, each broadcasting system has the same frequency. It is configured so that different contents can be broadcasted using the.
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 of the reference example 1 , at least the transmitting antenna 3 constituting the base station device 1 provided in the system is located below the mobile terminal 23 in use. In addition to being arranged at a location and radiating a specific area information signal upward, an antenna is installed on the wall of an exhibition booth or store as in the prior art to direct radio waves to a specific area. Compared with the case of radiating horizontally or slightly downward, the reflected waves caused by the reflected radio waves reflected on exhibits made of conductive materials, surrounding exhibition booths, store structures, etc. can be suppressed. , It is possible to eliminate or narrow the area where the dead zone of the radio wave caused by the presence of the direct wave and the reflected wave is generated (particularly in the exhibition hall, Is of course suitable for tall buildings.).

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 direction of movement of the visitor 20, and the area where reception failure occurs is widened, whereas in Reference Example 1 , the area-limited broadcasting system for each specific area is prepared. Each of the transmitted antennas 3 is configured so that the radiation direction of the specific area information signal is directed upward. Even if a dead zone area occurs due to the directivity characteristics of the na 3 itself, the occurrence area is formed toward the ceiling direction (that is, the direction in which no visitor 22 exists) rather than the horizontal direction. , To obtain limited information for a specific area easily and more reliably than a conventional technology by preparing a general-purpose mobile terminal such as the mobile phone 23 without having to prepare a special mobile terminal Will be able to.

Next, Reference Example 2 which is a premise of the present invention will be described with reference to FIG.
First, the difference between the area limited broadcasting system for the specific area of the reference example 2 and the area limited broadcasting system for the specific area of the reference example 1 is described.
In the reference example 2 , in addition to providing at least one broadcast system for the specific area of the reference example 1 in the limited area, an area limited broadcast system for the limited area is provided. (A) is a schematic diagram showing an example in which at least one broadcasting system for a specific area of Reference Example 1 is provided in the exhibition hall 100 as the limited area, and the broadcasting system is also provided for the limited area. (B) is a schematic diagram showing an example in which the underground shopping area 200 as the limited area includes at least one broadcasting system for the specific area of the reference example 1 and also includes a broadcasting system for the limited area. It is.
In addition, in order to perform the following description simply, the same code | symbol is provided to the same component as the said reference example 1, and detailed description is abbreviate | 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, also in the area limited broadcasting system in Reference Example 2, 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 same as in Reference Example 1 above. In addition, information for limited areas and information for specific areas can be obtained seamlessly.

The movement of the visitor 22 at this time will be described in more detail with reference to FIGS.
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 of Reference Example 2 in more detail, as seen from the arrow RV in FIG. 3 (a). It is the perspective view which fractured | ruptured a part of back 12 of the exhibition booth 10a.
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 shows the calculation of the broadcast reception area and dead zone area for a specific area in the exhibition booth 10a in the area limited broadcasting system of Reference Example 2 .
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 this reference example 2 , 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 for the specific area is limited. By changing the arrangement direction of each antenna so that the radio waves radiated from the transmission means 5 constituting the broadcasting system are radiated with vertical polarization, the discrimination degree of both polarizations is improved.

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.

Thus, in the area limited broadcasting system in Reference Example 2, while 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, The transmission antennas 3 constituting the transmission means 5 provided in the area limited broadcasting system for the specific area are configured to radiate the specific area information signal upward from the lower position of the portable terminal 23 in the use state. especially addition, the directional characteristics of the transmitting antenna 3 itself, even if the dead zone area is generated, the principal generating area is formed towards the horizontal direction the ceiling direction (i.e. the direction visitors 22 does not exist) The
For this reason, the visitor 22 has a general-purpose portable terminal such as a mobile phone 23 that he / she has, and is easier and more reliable than the prior art. In addition, since both pieces of information can be obtained at the same frequency, the visitor 22 can obtain information seamlessly only by setting the mobile terminal once. Can provide.

Will now be described implementation form of the present invention based on FIGS.
Area-limited broadcasting system limitation for the area according to the present implementation embodiment is a different embodiment of area-limited broadcast system for limited areas in Reference Example 2, intended to further narrow the occurrence of the dead zone area of the above configuration It is what.
In these drawings FIG. 7 is a schematic view of a partially enlarged of the present implementation embodiment exhibition booth 30a is a specific area provided in the area limited broadcast system for limiting areas, to the exhibition booth 30a It is a figure for demonstrating the specific structure of the specific area limited broadcasting system provided. Also in this embodiment, the same reference numerals are given to the same components as those in the above-described reference example, and detailed description thereof is omitted.

In the present embodiment, the transmitting antenna 3 constituting the transmitting means 5 is formed into a predetermined shape using an antenna portion 33a that radiates the specific area information signal and a conductor material provided near the antenna portion 33a. The formed shielding material is configured to include a shielding portion 33b provided so that a surface thereof faces in a radiation direction of the antenna portion. At least the antenna portion 33a includes 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 the 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.

More specifically, as best shown in Figure 7, the shielding portion 3b in the present implementation embodiment, the material of the side walls 11, 11 and rear 12 delimiting the exhibition booth 30a, using the conductive material In the partition formed by veneer material or the like, a shielding material formed in a predetermined shape using a conductive material is provided, and an antenna unit is formed using the shielding unit 3a. In addition to limiting the radiation range of radio waves transmitted from 33a, broadcast waves for other specific areas are prevented from jumping into the mobile terminal 23 in use.
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.
The size of the shielding portion 33b in the present implementation embodiment, an example of matching the both side surfaces 11, 11 and the size of the back 12 of the exhibition booth 30a, is limited to the embodiments particularly its size For example, the size and the installation position may be determined so as to match the directivity characteristics of the transmission antenna.

Next, a description will be given receiving area and dead zone area that occurs in the present implementation mode based on FIG.
FIG. 8 is a schematic diagram for explaining the reception area when the limited area broadcasting system and the specific area broadcasting system exist in the area limited broadcasting system of the present embodiment , and the reception area of the exhibition booth 30a. A dead zone area obtained by calculation is shown.
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 clearly seen from this figure, according to the present implementation mode, the transmission antennas constituting the transmission unit 5, with the antenna unit 3a, a conductive material provided in the vicinity of the antenna section 3a predetermined The shielding member is formed in the shape of the shielding member 3b provided so that the surface thereof faces the radiation direction of the antenna unit 3a. At least the antenna unit 3a When comparing the vertical position of the antenna unit 3a and the portable terminal 23, the horizontal plane including the position where the antenna unit 3a is installed is always used rather than the horizontal plane including the position of the portable terminal 23 in use. The antenna unit 3a is disposed below the horizontal plane indicating the position of the mobile terminal 23 in the state, and the antenna unit 3a is configured to transmit the specific error transmitted from the antenna unit 3a. The information signal is radiated upward, and the shielding portion 3b further includes the shielding portion 3b in the comparison of the horizontal position between the shielding portion 3b and the portable terminal 23. by but the horizontal plane including the position in the state of use of the plane formed between the mobile terminal 23 is disposed at a position so as to intersect, the dead zone area 111a caused by the configuration of the present implementation mode is shown in FIG. 5 It can be seen that the dead zone area 101a generated by the configuration of Reference Example 2 can be further narrowed.

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 above embodiment, 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 constitutes the area limited broadcasting system for the specific area. The transmitting means 5 is configured to radiate the radio wave radiated in the vertical polarization, but may be arranged according to the directivity characteristics of the transmitting antenna, and is not particularly limited to this embodiment. .
In the above-described embodiment, when the transmission antenna 3 is installed, the center line of the directivity characteristic of the transmission antenna is disposed so as to be vertically upward with respect to the horizontal plane including the position where the transmission antenna 3 is installed. However, the radiation direction of the radio wave may be shifted depending on the situation of the 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 ( reference example 2 ), 101a ... dead area ( reference example 2 ), 110a ... Receivable A (embodiment) 111a ... play area (Embodiment), 200 ... underground mall.

Claims (5)

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 area-limited broadcast system for a particular area formed by configured to receive the,
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;
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, It is configured to include a shielding part provided so that its surface faces the radiation direction of the antenna part,
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 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 The area-limited broadcasting system according to claim 2, wherein the specific area information signal used in the system is generated from information different for each specific area. 4. The area limited broadcasting system according to claim 3, wherein all the specific area information signals used in the system are configured to transmit at a predetermined level using radio waves having 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. 5. The area limited broadcasting system according to claim 3 , wherein the base station apparatus is provided.

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