JP2006217004A - Relaying system, relaying method, transmission station, and relay station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relaying system, a relaying method, a transmission station, and a relay station for transmitting area information to a receiver without requiring the receiver to have a special function. <P>SOLUTION: The relay station superimposes the area information in a partial receiving layer on a fixed receiving layer through which many data can be transmitted. The relay station receives a broadcast wave in which the area information is superimposed on the fixed receiving layer and extracts the area information of a range (area) managed by the relay station from the area information superimposed on the fixed receiving layer. Then the relaying apparatus superimposes the area information on the partial receiving layer and transmits the superimposed area information. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a relay system, a relay method, a transmission station, and a relay station, and in particular, receives a broadcast wave in which a plurality of area information is superimposed on a first layer with a large amount of data transmission from the transmission station. The present invention relates to a technique for extracting local information of a local station from a first layer of a received broadcast wave and superimposing the extracted regional information on a second layer having a smaller data transmission amount than the first layer and retransmitting the information.

  In recent years, terrestrial digital broadcasting has been started as an alternative to terrestrial analog broadcasting waves. This terrestrial digital broadcasting system is a multi-carrier system, and OFDM (Orthogonal Frequency Division Multiplexing) in which 429 kHz is assigned as a guard band in one channel transmission band (bandwidth 6 MHz) and the remaining bandwidth is divided into 13 segments. ) Is broadcast by the system. The segment is a basic band (1/13 of the TV channel band excluding the guard band) of the transmission signal in which the control signal carrier is added to the data carrier. In the transmission band of one channel divided into 13 segments, transmission parameters and information to be transmitted can be set for each segment.

  For this reason, it is possible to broadcast a high-definition television broadcast on one channel, or a combination of various services such as a plurality of standard television broadcasts and data broadcasts on one channel.

  Also, by setting the transmission parameters of some segments (hierarchies) to be strong against interference (for example, changing the modulation method), in addition to reception at home, reception by mobile objects such as automobiles and reception by portable terminals It is also possible to provide a service suitable for (hereinafter referred to as partial reception). In digital terrestrial broadcasting, a mobile broadcast service (partial reception) is scheduled for one segment in the center of 13 segments, and a relay station is installed to expand the partial reception broadcast service using this mobile terminal. Consideration has been made to expand the coverage area.

  On the other hand, in those mobile broadcasting services (partial reception), a plurality of highly regional information is transmitted within one segment, and only the highly regional information that matches the viewing location is selected on the receiving side. There is technology to do.

Moreover, in the portable terminal which can communicate, there also exists a technique which acquires the regional information corresponding to the positional information from a server etc. based on the positional information acquired by GPS etc. (for example, patent document 1).
JP 2000-115724 A

  However, as described above, the technique of transmitting a plurality of pieces of area information within one segment and selectively acquiring information on the area on the receiving side increases the total amount of data because there are a plurality of pieces of area information to be transmitted. As a result, a mobile service that uses a band with a limited data transmission amount of one segment cannot transmit all the regional information, and it is difficult to implement.

  In addition, the technology for acquiring region information corresponding to the position information from a server or the like based on the position information acquired by GPS or the like must acquire the position information by means of GPS or the like. It could not be used on a terminal without an acquisition means. Further, the terminal needs to communicate with a server that converts the area information corresponding to the position information, and there is a problem that the terminal does not function in an area where communication is impossible.

  Accordingly, the present invention has been invented in view of the above problems, and a relay system and a relay method capable of transmitting area information related to a viewing area to a receiver without requiring a special function from the receiver. And providing a transmitting station and a relay station.

  A first invention for solving the above-mentioned problem is a broadcast wave relay system composed of a plurality of layers by a multi-carrier method, wherein a broadcast wave in which a plurality of area information is superimposed on a first layer having a large amount of data transmission is provided. The transmitting station that receives the broadcast wave, receives the broadcast wave, extracts the local information of the local station from the first layer of the received broadcast wave, and extracts the extracted regional information from the first layer having a smaller data transmission amount than the first layer. And a relay station that retransmits the data by superimposing it on the second layer.

  A second invention for solving the above-mentioned problem is characterized in that, in the first invention, the first hierarchy is a hierarchy for fixed reception, and the second hierarchy is a hierarchy for partial reception. .

  According to a third invention for solving the above-mentioned problems, in the first or second invention, identification information for identifying a relay station is attached to the regional information, and the relay station provides regional information corresponding to the identification information of the local station. And the region information is superimposed on the second layer and retransmitted.

  According to a fourth invention for solving the above-mentioned problem, in any one of the first to third inventions, the transmitting station is configured to transmit only new area information, and the relay station receives the received area. The information is stored, and the stored area information is transmitted by a data carousel method.

  According to a fifth invention for solving the above-mentioned problem, in any one of the first to fourth inventions, the relay station retransmits the identification information for identifying the relay station superimposed on the second layer. It is configured.

  A sixth invention for solving the above-mentioned problems is the invention as set forth in any one of the first to fifth inventions, wherein the transmitting station has means for transmitting information relating to generation of an event message superimposed on the first layer. The relay station has means for generating an event message based on the information and transmitting the event message superimposed on the second layer.

  A seventh invention that solves the above-described problem is a transmission station that transmits a broadcast wave composed of a plurality of hierarchies in a multi-carrier scheme, in which a plurality of area information is superimposed on the first hierarchy with a large amount of data transmission It has the means to transmit a wave, It is characterized by the above-mentioned.

  An eighth invention for solving the above-mentioned problems is characterized in that, in the seventh invention, the first hierarchy is a hierarchy for fixed reception.

  A ninth invention for solving the above-mentioned problems is characterized in that, in the seventh or eighth invention, identification information for identifying a relay station is added to the area information.

  A tenth invention for solving the above-mentioned problem is characterized in that, in any of the seventh to ninth inventions, the transmitting station is configured to transmit only new area information.

  In an eleventh invention for solving the above-mentioned problem, in any one of the seventh to tenth inventions, the transmitting station has means for superimposing and transmitting information relating to the generation of the event message on the first layer. It is characterized by.

  In a twelfth aspect of the present invention for solving the above-described problem, a broadcast wave in which a plurality of area information is superimposed on a first layer having a large amount of data transmission of a broadcast wave composed of a plurality of layers by a multicarrier system is received and retransmitted. A relay station to extract local information of the local station from the first layer of the received broadcast wave, and superimpose the extracted regional information on a second layer having a smaller data transmission amount than the first layer. And re-transmitting means.

  A thirteenth invention for solving the above-mentioned problem is characterized in that, in the above-mentioned twelfth invention, the first hierarchy is a hierarchy for fixed reception, and the second hierarchy is a hierarchy for partial reception. .

  In a fourteenth invention for solving the above-mentioned problem, in the twelfth or thirteenth invention, identification information for identifying a relay station is attached to the regional information, and the relay station is regional information corresponding to identification information of the local station. And the region information is superimposed on the second layer and retransmitted.

  In a fifteenth aspect of the present invention for solving the above-described problem, in any one of the twelfth to fourteenth aspects, the relay station stores the received area information, and stores the stored area information by a data carousel method. It is comprised so that it may transmit.

  In a sixteenth invention for solving the above-mentioned problem, in any one of the twelfth to fifteenth inventions, the relay station retransmits the identification information for identifying the relay station superimposed on the second layer. It is configured.

  In a seventeenth aspect of the present invention for solving the above-described problem, in any one of the twelfth to sixteenth aspects, the relay station generates an event message based on information related to the generation of the event message superimposed on the first layer. It has a means to generate and superimpose on a 2nd hierarchy, and to transmit.

  An eighteenth invention for solving the above-described problem is a broadcast wave relay method comprising a plurality of layers by a multicarrier system, wherein a plurality of area information is superimposed on a first layer having a large amount of data transmission from a transmitting station. The relay station receives the broadcast wave, receives the broadcast wave, extracts the local information of the local station from the first layer of the received broadcast wave, and extracts the extracted regional information from the first layer. Retransmission is performed by superimposing on the second layer with a small transmission amount.

  A nineteenth invention for solving the above-mentioned problem is characterized in that, in the eighteenth invention, the first hierarchy is a hierarchy for fixed reception, and the second hierarchy is a hierarchy for partial reception. .

  In a twentieth aspect of the invention for solving the above-described problem, in the eighteenth or nineteenth aspect of the invention, identification information for identifying a relay station is attached to the regional information, and the relay station provides regional information corresponding to the identification information of the local station. And the region information is superimposed on the second layer and retransmitted.

  In a twenty-first invention for solving the above-mentioned problem, in any one of the eighteenth to twentieth inventions, the transmitting station transmits only new area information, and the relay station stores the received area information, The stored area information is transmitted by a data carousel method.

  In a twenty-second invention for solving the above-mentioned problem, in any one of the eighteenth to twenty-first inventions, the relay station retransmits the identification information for identifying the relay station superimposed on the second layer. Features.

  In a twenty-third invention for solving the above-mentioned problem, in any one of the eighteenth to twenty-second inventions, the transmitting station superimposes and transmits information relating to generation of an event message on a first layer, and the relay station Is characterized in that an event message is generated based on the information and is superimposed on the second layer and transmitted.

  The present invention uses a hierarchy capable of transmitting a large amount of data to transmit a large amount of area information, and the relay station extracts the corresponding area information from the hierarchy, and this area information is used for mobile or mobile reception. By superimposing and retransmitting on the layer, it is possible to provide a service for providing regional information without providing a special function such as GPS position acquisition on the receiver side.

  In addition, the relay station is provided with storage means to hold the area information, and the data such as the area information once transmitted between the transmitting station and the relay station is not sent multiple times, but is received once at the relay station side. By storing data such as regional information, and by configuring the accumulated data to repeatedly transmit information according to the normal data carousel method, there is room in the layer (bandwidth) where regional information is superimposed, A large amount of regional information can be transmitted, and the number of relay stations that can receive the regional information is greatly increased.

  Embodiments of the present invention will be described.

  A typical example of multi-carrier broadcasting to which the present invention is applied is terrestrial digital broadcasting. In the present terrestrial digital broadcasting, as shown in FIG. 1, one channel is allocated to a bandwidth of 6 MHz, 429 kHz is allocated as a guard band out of the 6 MHz band, and the remaining bandwidth is divided into 13 segments. It is broadcast by (Orthogonal Frequency Division Multiplexing) system. The band of one segment is 429 kHz, and the 13 segments can be divided into a plurality of hierarchies such as a first hierarchy and a second hierarchy. Each layer can take a different modulation scheme, and as a result, the amount of data that can be transmitted differs from layer to layer.

  For example, it is considered that one segment in the center is assigned to a partial reception layer (strong layer) for portable receivers, and a layer composed of other segments is used as a fixed reception layer (weak layer) for fixed reception.

  The fixed reception layer (weak layer) is intended for viewing in an environment where stable reception is desired, as typified by a television receiver installed at home. A modulation scheme that can transmit a large amount of data is employed.

  On the other hand, the partial reception layer (strong layer) is based on the premise that the broadcast wave is received while moving, as represented by a mobile phone that allows TV viewing. Modulation methods that can respond to changes are being studied. In addition, since the viewer receiving the partial reception layer is at a place where the viewer is viewing for some purpose, it is desirable that the information provided in the partial reception layer also provides regional information related to the location. Here, the regional information is a concept including not only advertisements related to the region, regional advertisements and information, but also disaster information.

  Therefore, the present invention transmits from the transmitting station a broadcast wave in which regional information of the partial reception layer is superimposed on a fixed reception layer that can transmit a large amount of data. Then, in the relay station, the region information in the range (region) that the relay station has jurisdiction is extracted from the region information superimposed on the fixed reception layer, and this region information is superimposed on the partial reception layer and retransmitted. It is.

FIG. 2 is a diagram showing an outline of the present invention, in which a broadcast wave 40 transmitted from the transmission station 10 is relayed by a plurality of relay stations 20 ₁ , 20 ₂ , and the broadcast waves 41 ₁ , 41 ₂ ,. It shows a configuration for re-transmission and reception by the receiver 30 existing in the jurisdiction range.

  The broadcast wave 40 transmitted from the transmission station 10 is an OFDM broadcast wave, and is composed of two layers, a fixed reception layer having a large data transmission amount and a partial reception layer having a smaller data transmission amount than the fixed reception layer. Become. The regional information 1 to the regional information 8 are superimposed on the fixed reception layer.

The plurality of relay stations 20 ₁ , 20 ₂ ,... Receive the broadcast wave 40, extract the local information for the local station from the fixed reception layer of the broadcast wave 40 based on the identification information of the local information, etc. The regional information is retransmitted with the partial reception layer superimposed. For example, the relay station 20 _1, the area information 1 to the region information 8 which is superposed on the fixed reception layer, extract the area information 1 of the own station, by superimposing the area information 1 to the partial reception layer, a broadcast wave Retransmits 41 ₁ . Moreover, the relay station 20 _2, the local information 1 area information 8 which is superposed on the fixed reception layer, extract the area information 2 of its own station, by superimposing the area information 2 to the partial reception layer, a broadcast wave 41 ₂ to re-send the.

The receiver 30 receives the partial reception layer of the broadcast wave retransmitted from the relay station, and displays the area information superimposed on the partial reception layer. For example, the receiver 30 is receiving a retransmitted broadcast wave 41 ₁ from the relay station 20 _1, the area information 1 is displayed superimposed on the broadcast wave ₄₁₁ parts reception layer. Further, the receiver 30 is receiving a retransmitted broadcast wave 41 ₂ from the relay station 20 _2, area information 2, which is superimposed on the broadcast wave 41 ₂ parts reception layer is displayed.

  Thus, each receiver 30 can receive regional information related to the region receiving the broadcast wave.

  Specific examples will be described below.

  A first embodiment of the present invention will be described.

  FIG. 3 is a block diagram of the transmitting station 10 according to the first embodiment.

  The transmitting station 10 includes a storage unit 11 in which TS (Transport Stream, hereinafter simply referred to as TS) packets to be transmitted are stored, and a transmission unit 12 that transmits the stored TS packets as broadcast waves.

  The stored TS is, for example, a region in which regional information is superimposed on a fixed reception layer and common information common to regions is superimposed on a partial reception layer. FIG. 4 shows a configuration example of a TS transmitted from the transmitting station 10 and overlaid with regional information.

  As shown in FIG. 4, the TS is composed of ESs (Elementary Streams, hereinafter simply referred to as ES) 100 and ES200 in a fixed reception layer and ES300 in a partial reception layer.

  The ES 100 for the fixed reception layer includes a module 110 and a module 120.

The module 110 stores control information 111 (identification information 20 ₁ ) and control information 112 (identification information 20 ₂ ) as resources. Note that the control information 111 and the control information 112 describe designation of regional information to be superimposed on a partial hierarchy by the relay station, timing of regional information transmission time, and the like. The parentheses in the control information 111 and the control information 112 described above indicate identification information for identifying which relay station the control information belongs to. This identification information, different identifiers for each relay station is assigned, for example, if the relay station 20 ₁ of the control information is subjected to as 20 _1.

The module 120 stores regional information 121 (identification information 20 ₁ -1) and regional information 122 (identification information 20 ₂ -1) as resources. Note that the parentheses of the area information 121 and the area information 122 described above indicate identification information for identifying which relay station the area information belongs to. This identification information, different identifiers for each relay station is assigned, for example, if one th ones of the neighborhood information of the relay station 20 _1, subjected to as 20 1 _-1.

The ES 200 for the fixed reception layer has a module 210. The module 210 stores regional information 221 (identification information 20 ₁ -2) as a resource. In addition, the parenthesis of the above described area information 221 indicates identification information for identifying which relay station the area information belongs to, as described above.

  The ES 300 for the partial reception layer has a module 310. The module 310 stores common information 321 common to the reception of the partial reception layer as a resource.

  The TS described above is transmitted from the transmitting station 10.

Next, the relay station will be described. Note that each relay station 20 _1, 20 _2, since ‥ is a similar arrangement, a description of only describes the relay station 20 _1, the other relay station is omitted.

FIG. 5 is a block diagram of the relay station 201 according to the _first embodiment.

Relay station 20 _1, as shown in FIG. 5, a receiving unit 21 for receiving a broadcast wave, a demodulator 22 for demodulating the broadcast wave, the relay station identification information holding unit 23 for holding the identification information of its own station, identification An extraction unit 24 that extracts area information and control information based on information, a storage unit 25 that stores the extracted control information and area information, and a partial reception layer that stores stored area information based on control information A superimposing unit 26 that superimposes the signal, a modulation unit 27 that modulates the signal on which the region information is superimposed, and a transmission unit 28 that retransmits the modulated signal.

Subsequently, the operation of the relay station 20 _1, the relay station 20 ₁ will be described as an example of the reception of TS shown in FIG. 4 described above.

  First, a broadcast wave from a transmitting station is received by the receiving unit 21 and demodulated by the demodulating unit 22. The demodulated TS is input to the extraction unit 24.

  The extracting unit 24 converts the control information and the area information into the identification information held in the relay station identification information holding unit 23 from the module in which the storage of the control information and the area information is determined in accordance with the rules predetermined between the transmission station and the relay station. Based on this, the control information and local information of the own station are extracted. In addition, although it is a method of storing or specifying control information and area information, it may be specified not only at a module but also at an ES or resource level. Further, the ES, the module storing the control information and the area information, or the resource itself may be designated by the PSI / SI such as PMT (Program Map Table) from the transmitting station.

In the example of FIG. 4, the control information is stored in the module 110, and the area information is stored in the module 120 and the module 210. The extraction unit 24 extracts control information and area information corresponding to the identification information (identification information = 20 ₁ ) of the own station held in the relay station identification information holding unit 23. In the example of FIG. 4, the control information 111 (identification information = 20 ₁ ) is extracted from the module 110, the area information 121 (identification information = 20 ₁ −1) is extracted from the module 120, and the area information 221 (identification) is extracted from the module 210. Information = 20 ₁ -2) is extracted. Then, the extracted control information and area information are stored in the storage unit 25.

  Subsequently, the superimposing unit 26 superimposes the regional information 121 and the regional information 221 on the partial reception layer based on an instruction (a transmission time, a combination of regional information, etc.) of the control information 111 stored in the storage unit 25. . FIG. 6 shows a specific example of TS when the regional information 121 and the regional information 221 are superimposed on the partial reception layer.

  6 includes ES100 and ES200 of the fixed reception layer and ES300 of the partial reception layer, like the TS illustrated in FIG.

The ES 100 for the fixed reception layer includes a module 110 and a module 120. In the module 110, control information 111 (identification information 20 ₁ ) and control information 112 (identification information 20 ₂ ) are stored as resources. The module 120 stores regional information 121 (identification information 20 ₁ -1) and regional information 122 (identification information 20 ₂ -1) as resources. The ES 200 for the fixed reception layer has a module 210. The module 210 stores regional information 221 (identification information 20 ₁ -2) as a resource.

  However, the ES 300 for the partial reception layer includes the module 310, and the module 310 stores the common information 321 as a resource. In addition to this, the regional information 121 and the regional information superimposed by the superimposing unit 26 are stored. 221 is also stored.

  As described above, the signal on which the region information is superimposed is modulated by the modulation unit 27, and the modulated signal is retransmitted by the transmission unit 28.

  In the receiver, by receiving the broadcast wave retransmitted from the relay station, the common information 321 is displayed on the receiver, and the regional information 121 and the regional information 221 superimposed by the superimposing unit 26 are also displayed. Is done. Note that the receiver is a receiver conforming to a normal standard, and thus detailed description thereof is omitted.

  Further, in the above-described embodiment, at the time of retransmission, the area information superimposed on the fixed reception layer is retransmitted as it is, but it may be removed by the relay station and retransmitted.

  Moreover, it may replace with the common information superimposed on the partial hierarchy, and you may make it the structure replaced with area information.

  In addition, by describing a URL that uniquely identifies communication content as regional information, a receiver for partial reception having a communication function can download and display communication content corresponding to the URL in an area where communication is possible. You can also.

  Furthermore, when transmitting broadcast waves from the relay station, if the relay station identification information is also transmitted by being superimposed on the partial hierarchy, the receiver can identify the relay station identification information even if the receiver does not have GPS or other position acquisition means. Can be used as position information indicating an area where the receiver exists.

  A second embodiment of the present invention will be described.

  In current data broadcasting in digital broadcasting and the like, since the viewer does not always receive at the same timing, a data carousel system that repeatedly transmits the same information is adopted.

  However, since the same information is repeatedly transmitted by adopting the data carousel method, it is also a fact that the content and amount of information to be transmitted are limited. In particular, when a plurality of different area information must be transmitted to the relay station as in the present invention, it is necessary to effectively use the band between the transmission station and the relay station.

  Thus, in the second embodiment, an example in which a band is effectively used between a transmission station and a relay station will be described.

In the second embodiment, between the transmitting station 10 and the relay stations 20 ₁ , 20 ₂ , 20 ₃ ..., The data such as the once transmitted area information is not transmitted a plurality of times, and the relay station side receives the received area information and the like. The data is stored in advance, and the stored data is repeatedly transmitted by the normal data carousel method to retransmit the information.

  In order to realize such a function, as shown in FIG. 7, in the transmitting station, in addition to the configuration of FIG. 3, a detection unit 60 is provided to prevent twice transmission of the area information.

  Further, in the relay station, as shown in FIG. 8, an update detection unit 70 is provided, the update of the area information is detected, and the updated area information is stored / updated in the storage unit 25. As a result, the superimposing unit 26 may superimpose the area information stored in the storage unit 25.

  Next, a specific operation will be described with reference to FIG.

First, the transmitting station 10, relay station 20 ₁ of the local information ₂₀ 1 -1, and area information ₂₀ 1 -2 and area information ₂₀ 1 -3, the relay station 20 ₂ of area information ₂₀ 2 -1, area information 20 and _2-2 and the area information 20 2 _-3, as in example 1 above, TS superposed on the fixed reception layer is transmitted.

In the relay station 20 ₁ receives the TS regional information is superimposed, region information ₂₀ 1 -1 of the own station from the TS, extracts the area information ₂₀ 1 -2 and area information ₂₀ 1 -3 accumulated, The TS in which these are superimposed on the partial reception layer is repeatedly transmitted by the data carousel method.

Similarly, the relay station 20 ₂ receives the TS regional information is superimposed, region information ₂₀ 2 -1 of the own station from the TS, extracts the area information ₂₀ 2 -2 and area information ₂₀ 2 -3 The TS that is accumulated and superimposed on the partial reception layer is repeatedly transmitted by the data carousel method.

In the transmitting station 10, once transmitted the relay station 20 ₁ of the local information ₂₀ 1 -1, and area information ₂₀ 1 -2 and area information ₂₀ 1 -3, the relay station 20 ₂ of area information ₂₀ 2 -1, area information 20 _2-2 and does not transmit the region information ₂₀ 2 -3, new, superimposed area information ₂₀ 3 -1 relay station 20 _3, the local information ₂₀ 3 -2 and area information ₂₀ 3 -3 fixed reception layer Send the TS.

In the relay station 20 _1, receives the TS regional information is superimposed, since no area information of its own station is included, the process of updating the area information is not performed.

Similarly, the relay station 20 ₂ also has received the TS regional information is superimposed, since no area information of its own station is included, the process of updating the area information is not performed.

In the relay station 20 _3, receives the TS regional information is superimposed, because it contains area information of its own station in the TS, area information 20 3 _-1 of the own station from the TS, area information 20 ₃ -2 and regional information 20 ₃ -3 are extracted and stored, and a TS in which these are superimposed on the partial reception layer is repeatedly transmitted by the data carousel method.

Conventionally, and transmits the same information repeatedly in the data carousel method which is performed in the transmitting station 10, but could not only send local information of the relay station 20 ₁ and the relay station 20 _2, of Example 2 By applying the invention, it becomes possible to transmit the regional information of the relay station 20 ₃ and other relay stations, and the number of relay stations that can receive the regional information increases dramatically.

  Further, since the area information is accumulated in the storage unit 25, the already accumulated area information and the newly sent area information can be combined and transmitted on the partial hierarchy by the control information.

  Furthermore, since the control information can be similarly stored in the storage unit 25, it is not necessary to transmit control information that is not updated many times.

  A third embodiment of the present invention will be described.

  In current digital broadcasting, an event message is adopted as one of means for controlling the operation of a receiver receiving the broadcast. In the third embodiment, an example in which this event message is generated by a relay station and used for regional information will be described.

  As shown in FIG. 10, the relay station according to the third embodiment includes an event message generation unit 80 that generates an event message in addition to the configuration of the first embodiment described above. The control information for controlling the generation of the event message is the control information related to the generation of the event message among the control information extracted by the extracting unit 24 and stored in the storage unit 25, and is previously set between the transmitting station and the relay station. Stored in a module or the like determined according to the rules defined in (1) and transmitted from the transmitting station. Although the control information is stored or specified, the control information may be specified not only by a module but also by an ES, a resource level, and an event message from the transmitting station to the relay station. In addition, an ES or a module in which control information is stored, a resource itself, or an event message may be designated from a transmitting station by PSI / SI such as PMT (Program Map Table).

  Based on the control information for controlling the generation of the event message among the control information stored in the storage unit 25, the event message generation unit 80 uses the region information specified by this control information to generate an event for the partial reception layer. A means for generating a message. This control information can also control the timing at which the generated event message is transmitted from the relay station.

  The event message generator 80 generates two types of event messages based on the control information.

  One describes the area information specified by the control information in the private data area of the event message, generates an event message including the display timing of the area information, and outputs the event message to the superimposing unit 26. Such an event message is effective for local emergency information such as disaster information.

  The other event message is an event message that defines the display timing of the area information sent in advance in the partial reception layer in the form of a module or the like. In this case, an event message describing the information for identifying the area information to be displayed and the display timing of the area information is generated and output to the superimposing unit 26.

  By doing so, the event message can be effectively used for providing regional information.

FIG. 1 is a diagram for explaining digital terrestrial broadcasting. FIG. 2 is a diagram showing an outline of the present invention. FIG. 3 is a block diagram of the transmitting station 10 according to the first embodiment. FIG. 4 is a diagram illustrating a configuration example of a TS transmitted from the transmission station 10 and overlaid with regional information. FIG. 5 is a block diagram of the relay station 201 according to the _first embodiment. FIG. 6 is a diagram illustrating a specific example of a TS when the region information 121 and the region information 221 are superimposed on the partial reception layer. FIG. 7 is a block diagram of a transmitting station in the second embodiment. FIG. 8 is a block diagram of the relay station in the second embodiment. FIG. 9 is a diagram for explaining the operation of the second embodiment. FIG. 10 is a block diagram of a relay station in the third embodiment.

Explanation of symbols

10 transmitting station 20 _1, 20 ₂ ‥ relay station 30 receiver 40 a broadcast wave 41 _1, 41 _2, ‥ broadcast wave

Claims (23)

A broadcast wave relay system consisting of a plurality of layers by a multi-carrier method,
A transmitting station that transmits a broadcast wave in which a plurality of pieces of area information are superimposed on the first layer with a large amount of data transmission;
The broadcast wave is received, the local information of the local station is extracted from the first layer of the received broadcast wave, and the extracted regional information is superimposed on the second layer having a smaller data transmission amount than the first layer. And a relay station for re-transmission.   The relay system according to claim 1, wherein the first layer is a layer for fixed reception, and the second layer is a layer for partial reception.   The identification information for identifying the relay station is attached to the area information, and the relay station extracts the area information corresponding to the identification information of the local station, and retransmits the area information superimposed on the second layer. The relay system according to claim 1, wherein the relay system is configured. The transmitting station is configured to transmit only new regional information,
4. The relay station according to claim 1, wherein the relay station stores the received area information and transmits the stored area information by a data carousel method. The relay system described.   5. The relay system according to claim 1, wherein the relay station is configured to superimpose identification information for identifying the relay station on a second layer and retransmits the identification information. . The transmitting station has means for transmitting information related to generation of an event message superimposed on the first layer, and
6. The relay system according to claim 1, wherein the relay station has means for generating an event message based on the information and transmitting the generated event message by superimposing the event message on a second layer. . A transmission station that transmits a broadcast wave composed of a plurality of layers according to a multicarrier scheme,
A transmitting station comprising means for transmitting a broadcast wave in which a plurality of pieces of area information are superimposed on a first layer having a large amount of data transmission.   The transmitting station according to claim 7, wherein the first layer is a layer for fixed reception.   9. The transmitting station according to claim 7, wherein identification information for identifying a relay station is attached to the area information.   The transmitting station according to any one of claims 7 to 9, wherein the transmitting station is configured to transmit only new area information.   The transmitting station according to any one of claims 7 to 10, wherein the transmitting station includes means for transmitting information related to generation of an event message superimposed on a first layer. A relay station that receives and retransmits a broadcast wave in which a plurality of area information is superimposed on a first layer having a large amount of data transmission of a broadcast wave composed of a plurality of layers according to a multicarrier scheme,
Means for extracting the local information of the local station from the first layer of the received broadcast wave, and superimposing the extracted regional information on a second layer having a smaller data transmission amount than the first layer and retransmitting the information; A relay station characterized by that.   The relay station according to claim 12, wherein the first layer is a layer for fixed reception, and the second layer is a layer for partial reception.   The identification information for identifying the relay station is attached to the area information, and the relay station extracts the area information corresponding to the identification information of the local station, and retransmits the area information superimposed on the second layer. The relay station according to claim 12 or 13, wherein the relay station is configured.   15. The relay station according to any one of claims 12 to 14, wherein the relay station stores the received area information, and transmits the stored area information by a data carousel method. The described relay station.   The relay station according to any one of claims 12 to 15, wherein the relay station is configured to superimpose identification information for identifying the relay station on a second layer and retransmit the identification information. .   13. The relay station according to claim 12, further comprising means for generating an event message based on information relating to generation of an event message superimposed on the first layer and transmitting the event message superimposed on the second layer. The relay station according to claim 16. A broadcast wave relay method composed of a plurality of layers by a multi-carrier method,
From the transmitting station, a broadcast wave in which a plurality of pieces of area information are superimposed on the first layer with a large amount of data transmission is transmitted,
The relay station receives the broadcast wave, extracts the local information of the local station from the first layer of the received broadcast wave, and extracts the extracted regional information as a second data transmission amount smaller than that of the first layer. A relay method characterized by superimposing and retransmitting a layer.   The relay method according to claim 18, wherein the first layer is a layer for fixed reception, and the second layer is a layer for partial reception.   The identification information for identifying the relay station is attached to the area information, the relay station extracts the area information corresponding to the identification information of the own station, and retransmits the area information superimposed on the second layer. The relay method according to claim 18 or 19, characterized in that The transmitting station transmits only new regional information,
21. The relay method according to claim 18, wherein the relay station stores the received area information and transmits the stored area information by a data carousel method.   The relay method according to any one of claims 18 to 21, wherein the relay station superimposes identification information for identifying the relay station on a second layer and retransmits the identification information. The transmitting station transmits information related to the generation of the event message superimposed on the first layer,
The relay method according to any one of claims 18 to 22, wherein the relay station generates an event message based on the information, and transmits the event message by superimposing the event message on a second layer.

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