JP2005176155A - Digital radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distribute digital data easily in small scale to unspecified number of persons within a limited small area. <P>SOLUTION: Digital transmission information is transmitted from a video server 1<SB>-i</SB>to a relay server 2<SB>-i</SB>by multicasting, the relay server 2<SB>-i</SB>converts the received data into unicast data and sends the data onto the Internet 3. A distribution server 4 transfers the data from the relay server 2<SB>-i</SB>to a designated public radio router 5<SB>-i</SB>by unicasting. In the public radio router 5<SB>-i</SB>, the digital information from the video server 1<SB>-i</SB>is converted from unicast to multicast and transmitted by radio through an antenna 6<SB>-i</SB>. Mobile terminals 7<SB>-1</SB>to 7<SB>-p</SB>located within a communication area of the public radio router 5<SB>-i</SB>receive the digital information transmitted by multicasting. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital wireless communication system capable of distributing data to an unspecified number of people in a limited small area.

Television broadcasting is generally well known as a means for distributing various kinds of information such as audio and video to an unspecified number of people. In addition, it has a satellite communication center connected to a satellite earth station as an Internet communication network for sending and receiving broadcasts over the Internet to a large number of users. The satellite communication center opens an HP on the Internet and programs on the HP A function is provided to allow the caller to make a reservation at a time when the program guide is available at the same time that the viewer reads out the program guide and uses it for a trial listening plan. Stores the broadcast content that is received, reads it out at the scheduled broadcast time, and reserves by setting up a communication line between the caller and the satellite communication center via the Internet etc. A technique for performing communication such as recording broadcast and live broadcast using a satellite communication line is disclosed (for example, see Patent Document 1).
JP 2003-134495 A

  When watching sports, etc. in a relatively small area such as a soccer field, baseball field, or sumo hall, in addition to watching directly live, you can use your own mobile phone, PDA, PHS, etc. If the broadcasted audio, images, etc. can be received, detailed information unique to the venue and the game can be obtained, and it can be expected that the game can be enjoyed more than the live watching by direct visual observation.

  However, in general television broadcasting, it is difficult to broadcast only to a limited small area, such as a soccer field, and there is a limit to delivering unique detailed information only for the venue and the game. .

  Further, the technique described in Patent Document 1 is a large-scale broadcasting system using a satellite, and further requires a reservation procedure for the user, and is not suitable for simple broadcasting in a small area.

  The present invention has been made paying attention to the above-mentioned problems, and provides a digital wireless communication system capable of distributing digital data to a large number of unspecified persons in a simple and small scale in a limited small area. It is an object.

  In the digital wireless communication system of the present invention, data transmitted from an information transmission server is transmitted from a relay server to a public wireless router on a network (Internet), and a plurality of specific receiving terminals or unspecified from the public wireless router. The receiving terminal is wirelessly transmitted by multicast or broadcast.

  In the digital wireless communication system of the present invention, digital data transmitted from the information transmission server can be transmitted to the relay server by multicast or broadcast.

  In the digital wireless communication system of the present invention, the relay server can convert the received multicast data or broadcast data into unicast data and send it to the network.

  In the digital wireless communication system of the present invention, a distribution server is connected to the network, and digital data from the relay server can be transmitted to the public wireless router via the distribution server.

  In the digital wireless communication system of the present invention, the distribution server receives unicast data from the relay server and transmits unicast data to the public wireless router, and the public wireless router multicasts the unicast data to the public wireless router. Data or broadcast data can be converted and transmitted wirelessly.

  The digital wireless communication system of the present invention further includes a camera capable of transmitting captured image data wirelessly, receiving image data from the camera by the public wireless router, and transmitting the image data to the relay server via a network. You may comprise so that transmission is possible.

  In the digital wireless communication system of the present invention, a plurality of public routers may be installed in the network so that different data can be distributed to each public wireless router.

  According to the present invention, a wireless LAN and multicasting (or broadcasting) of a wireless unit can realize a large number of simultaneous receptions and multi-channels, and facilities can be installed in a limited area such as a live field such as a football or a concert. In addition to visual observation, the function as the second eye can be easily realized without increasing the cost.

  Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a block diagram showing a system configuration for explaining a digital wireless communication system according to an embodiment of the present invention.

In this communication system, a plurality of video servers 1 ₋₁ ,..., 1 _-n are connected to the Internet 3 via relay servers 2 _{−1 ,.} The distribution server 4 is also connected to the Internet 3. The antenna _6-1, respectively, _6-2, ..., public wireless router _25-1 comprises 6 _-m, 5 _-2, ..., 5 _-m is connected to the Internet 3. A plurality of portable terminals (receiving terminals) 7 ₋₁ , 7 _-2 ,..., 7 _-p possessed by each user are respectively public wireless routers 5 ₋₁ , 5 _{−2 ,.} , The digital data transmitted from the corresponding ones of the public wireless routers 5 ₋₁ , 5 ₋₂ ,..., 5 _−m can be received.

The video servers 1 _-1 ,..., 1 _-n can respectively transmit digital image data, and transmit them to the relay servers 2 _{-1 ,.} This multicast transmission is shown in FIG. The relay servers 2 ₋₁ ,..., 2 _-n convert the received multicast digital data into unicast and send it over the Internet 3.

The distribution server 4 receives the unicast data from the relay servers 2 ₋₁ ,..., 2- _n , and the received data depends on the data from which relay server, and the public wireless router 5 _{−1 is} transmitted over the Internet 3. Transfer to any of 5 _-2 , ..., 5 _{-m using} the same unicast method. Transmission by the unicast method from the relay servers 2 ₋₁ ,..., 2 _-n to the distribution server 4 is indicated by x in FIG. Further, transmission by the unicast method from the distribution server 4 to the public wireless routers 5 ₋₁ , 5 ₋₂ ,..., 5 _−m is indicated by y in FIG. The distribution server 4, the relay server 2 _-1, ..., 2 _-n of any response to it has received from the server, the public wireless router _{5-1, 5-2,} ..., of any of the 5 _-m Controls whether to send to the router.

When the public wireless router 5 ₋₁ ,..., 5- _m receives unicast data directly transmitted from the distribution server 4 or from the relay servers 2 _{−1 ,.} And wirelessly transmitted from the antennas 6 ₋₁ ,..., 6 _-m . The multicast data is received by the mobile terminals 7 ₋₁ ,..., 7 _−p that are within the communication range of the public wireless router. Transmission by the multicast method to the mobile terminals 7 _-1 ,..., 7 _-p through the public wireless router 5 _-i and the antenna 6 _-i is shown by b in FIG.

In the above embodiment, the video server 1 ₋₁ ,..., 1 _-n and the relay server 2 ₋₁ ,..., 2 _-n , and the public wireless router 5 _{−1 ,.} Instead of this, the multicast method communication between 7 ₋₁ ,..., 7 _−p may adopt a broadcast method. The unicast method, multicast method, and broadcast method referred to here are already well-known communication methods. Unicast is a communication method performed between 1: 1 computers with a single counterpart computer to which data is to be transmitted. The multicast method is communication performed between a plurality of one-to-many computers with a plurality of counterpart computers to which data is transmitted. The computers with which you communicate are not all but a particular computer. The broadcast method refers to communication between one-to-many computers having a plurality of counterpart computers to which data is transmitted. It is distinguished from multicast in that the communicating computer is all computers in the network. When the same data is transmitted to a plurality of destinations by the unicast method, the same data is attached to each destination name and transmitted. On the other hand, when the same data is transmitted to a plurality of destinations by the multicast method, the names of the destinations are sequentially arranged, followed by data transmission.

In the above-described embodiment system, for example, when image data transmitted from the video server 1 _-1 is distributed to the mobile terminals 7 _-1 ,..., 7 _-p in the communicable area of the public wireless router 5 _-1. Transmits the image data to the relay server 2 _-1 by multicast from the video server 1 _-1 . The relay server 2 _-1 converts the received multicast image data into unicast and transmits it to the Internet 3. The distribution server 4 receives the image data of a unicast from the relay server 2 _-1, it analyzes the video server 1 _-1, the data of the public wireless router 5 for _-1 from the relay server 2 _-1, the image Similarly, the data is transferred to the public wireless router _5-1 .

The public wireless router _5-1 converts the transferred image data from unicast to multicast, and transmits the image data by multicast from the antenna _6-1 . Each of the mobile terminals 7 _-1 ,..., 7 _-p receives the transmitted image data.

Of course, not the image data from the video server 1 _-1 than the wiring server 4 public wireless router 5 _-1 only, other public wireless router _5-1, ..., and transferred to 5 _-m, each public wireless router The image data can also be transmitted by multicast in each communication area of 5 ₋₁ ,..., 5 _-m .

The camera 8 has a function of transmitting a captured image, and transmits the image captured in the communication system. For example, the image from the camera 8 can be received by the antenna 6 _-1 and transmitted to the relay server 2 _-1 , the distribution server 4, etc. via the public wireless router 5 _-1 and the Internet 3. Information obtained from the camera 8 can be transmitted from the distribution server 4 via each public wireless router 5 _{−1 ,.}

In the above description, the distribution server 4 from the public wireless router 5 _-i or each public wireless router 5 _-1, ..., delivery to 5 _-m, each public wireless router _5-1, ..., 5 _- Explanation is given on the assumption that transmission from _m to each mobile terminal device 7 ₋₁ ,..., 7 _-p is performed, that is, mobile terminal devices 7 _{−1 ,.} However, the distribution from the distribution server to the public wireless router may be performed regardless of the presence or absence of the receiving terminal (portable terminal). Such a distribution method is suitable for use when the number of receiving terminals is 1000, 10000 or more, such as a soccer field to be described later.

On the other hand, the distribution of the public wireless routers 5 ₋₁ ,..., 5- _m from the distribution server 4 may be performed only when there is a receiving terminal. This method is preferably used when distributed to many public wireless routers and the number of receiving terminals is not so large. Unnecessary transmission can be minimized without distributing to a public wireless router having no receiving terminal. In the case of adopting this method, specifically, the public wireless router designated by multicast or broadcast distribution from the distribution server makes a request to the receiving terminal, and the receiving terminal returns a response. If there is an answer, that is, if there is a receiving terminal, the presence of the receiving terminal is dynamically managed by the response. The public wireless router executes multicast or broadcast distribution while recognizing the presence of the receiving terminal. The request cycle may be variable when the receiving terminal is present and when it is not present.

In the above, the video servers 1 _-1 ,..., 1 _-n may be connected to other media servers other than the video server as appropriate.

Next, a case where the digital wireless system is applied to a soccer field as a specific example will be described with reference to FIG. 2, _{5-1, 5-2, 5-3,} 5 _-4 antenna _6-1 provided in place of the grandstand soccer field, respectively, ..., a public wireless router with _6-4. In the ground, cameras 8 ₋₁ , 8 ₋₂ , 8 ₋₃ , and 8 ₋₄ are arranged after the pole 11 and on both sides. Game before the start of, or during the game, introduction and guidance of the players, the broadcast content, the distribution server from each public wireless router 5 _-1, ..., from 5 _-4, broadcast in multicast (broad scan strike) to the field. The audience receives this broadcast with the portable terminal 7- _i . Further, a fine play image in the game shot with the cameras 8 _-1 ,..., 8 _-4 is transmitted to the distribution server and the relay server via the antennas 6 _{-1 ,.} The images are transmitted from the public wireless routers 5 _-1 ,..., 5 _-4 and received by the mobile terminal 7 _-i . As a result, the audience can watch the game directly with their eyes, and can view the detailed play contents on the mobile terminal 7 _-i as an image.

Another specific application example will be described with reference to FIG. FIG. 3 shows a case where the digital wireless communication system of the present invention is adopted in a shopping street. In the shopping street shown here, the public wireless routers 5 _-1 , 5 _-2 with antennas 6 _-1 , 6 _-2 ,..., 6 _-m are connected to the shops A, B _,. ... From 5 _-m , video and audio unique to each store are transmitted by multicast (or broadcast). Therefore, when the person who has the portable terminal 7 _-i passes in front of the store A, the video and audio from the store A can be received. When a plurality of people arrive, each can receive video and audio from the store A. Person carrying the portable terminal device 7 _-i is, by walking from the previous merchant A, when moving to the previous merchant B, received by automatic switching video, audio from the public silent router 5 _-2 Now merchant B be able to. Information provided at this time may be not only live but also information stored in advance.

  In addition, this digital wireless system can be applied not only to shopping streets, but also to general streets, Expo venues, and other event venues. In this kind of application, you can receive different video and audio by moving, so we will provide recommended information to those who are in front of the store, the realization of a city museum, the realization of a city health center, It can be used for inviting customers to visit. It can also be used to invite visitors to the pavilion at the Expo and other event venues.

1 is a block diagram showing a digital radio communication system according to an embodiment of the present invention. It is a figure explaining the case where the embodiment digital wireless communication system is applied to a soccer field as a specific example. It is a figure explaining the case where the digital wireless communication system of the embodiment is applied to a shopping street as a specific example.

Explanation of symbols

1 _-1, ......, 1 _-n video server 2 _-1, ......, 2 _-n relay server 3 Internet 4 distribution server _{5 -1, 5 -2, ......,} 5 -m public wireless router _{6-1, 6-2} , ..., 6- _m antenna _7-1 , _7-2 , ..., 7- _p mobile terminal 8 camera

Claims (7)

  Digital data transmitted from the information transmission server is transmitted from the relay server to a public wireless router on the network, and wirelessly transmitted by multicast or broadcast from the public wireless router to a plurality of specific receiving terminals or unspecified receiving terminals. A digital wireless communication system characterized by transmitting.   The digital wireless communication system according to claim 1, wherein the digital data transmitted from the information transmission server is transmitted to the relay server by multicast or broadcast.   3. The digital wireless communication system according to claim 2, wherein the relay server converts the received multicast data or broadcast data into unicast data and transmits the unicast data on the network.   The distribution server is connected to the network, and the digital data from the relay server is transmitted to the public wireless router via the distribution server. Digital wireless communication system.   The distribution server receives unicast data from the relay server and transmits unicast data to the public wireless router, and the public wireless router converts the unicast data into multicast data or broadcast data for wireless transmission. 5. The digital wireless communication system according to claim 4, wherein:   2. A camera capable of wirelessly transmitting captured image data, wherein the image data from the camera is received by the public wireless router and can be transmitted to the relay server via a network. The digital wireless communication system according to claim 2, 3, 4, or 5.   A plurality of the non-public routers are installed in the network, and different data can be distributed to each public wireless router. The claim 1, 2, 3, and 4, The digital wireless communication system according to claim 5 or 6.

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