JP2008124934A - Digital terrestrial broadcasting system, relay station apparatus for digital terrestrial broadcasting, and control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect an abnormality caused by interference fault or the like in a relay station apparatus, and to easily suppress output or switch output system. <P>SOLUTION: When broadcast waves sent from a master station apparatus A1 are relayed/transmitted by a relay station apparatus B, the master station apparatus A1 adds a broadcast station (master station) ID to a broadcast wave and send it out. A relay station apparatus B receives the broadcast wave, acquires the broadcast station ID to be added to the broadcast wave, collates it with the preset broadcast station ID, and control to stop relay transmission when the collated result is not coincident. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital terrestrial broadcasting system that relays and transmits broadcast waves of digital terrestrial television broadcasting using a plurality of relay station apparatuses.

  In recent years, terrestrial digital broadcasting, which is rapidly spreading, employs a system in which broadcast waves from a master station are relayed and transmitted by a large number of relay station devices in order to reduce the dead zone of radio waves as much as possible. In each relay station apparatus, transmission power is set in accordance with the size of the service area. However, when the radio wave environment changes due to weather, building construction, mountain cutting, etc., radio waves may fly more than expected, resulting in interference interference. When such a situation occurs, it is extremely difficult to find a relay station device in which a failure has occurred from among a large number of relay station devices, and to suppress output or switch output systems. It is a problem.

Note that the transmission format of the ISDB-T broadcast TS applied in the present invention is described in Non-Patent Document 1. In addition, as a technique related to the present invention, Non-Patent Document 2 describes that transmission control information is superimposed on an OFDM-AC region and transmitted in a terrestrial digital broadcasting system.
ARIB (Association of Radio Industries and Businesses) B10 ITE Technical Report Vol.28, No.22, PP.1-4 BCT2004-66 (Mar.2004) Technical Report of the Institute of Image Information and Television Engineers “Regarding SFN synchronization using signals with transmission control information superimposed on OFDM-AC domain” A Study ”

  As described above, in the conventional digital broadcasting system, when an interference failure occurs, the relay station device in which the failure has occurred is discovered from among a large number of relay station devices, and the output is suppressed or the output system is switched. It was extremely difficult.

  In order to solve the above-described problems, the present invention provides a terrestrial digital broadcasting system and a terrestrial digital broadcasting relay station that can detect abnormality due to interference interference in a relay station apparatus and can easily suppress output or switch an output system. It is an object to provide a device and a relay station device control method.

  In order to solve the above problems, the terrestrial digital broadcasting system according to the present invention is characterized by the following configuration.

  (1) In a digital terrestrial broadcasting system in which broadcast radio waves transmitted from a master station device are relay-transmitted by a relay station device, the master station device transmits the broadcast radio wave with parent station identification information added thereto, and the relay station The apparatus receives the broadcast radio wave, acquires master station identification information added to the broadcast radio wave, stores preset master station identification information, and stores the master station identification information when the master station identification information is acquired. The relay processing is controlled based on the collation result and collation with the master station identification information.

  (2) In a terrestrial digital broadcasting system in which broadcast radio waves transmitted from a master station device are relay-transmitted by a relay station device, the master station device has a relay station list in which relay station identification information in a relay route is indicated in the broadcast radio waves The relay station device receives the broadcast radio wave, acquires the relay station list information added to the broadcast radio wave at the master station device, and identifies the relay station given individually in advance. Information is stored, and when the relay station list information is acquired, it is determined whether or not the stored relay station identification information is included, and relay processing is controlled based on the determination result To do.

  The digital broadcast relay station apparatus according to the present invention is characterized by the following configuration.

  (3) In a terrestrial digital broadcast relay station device used in a terrestrial digital broadcasting system and relaying broadcast radio waves from a master station device, the broadcast radio waves are received and added to the broadcast radio waves by the master station device. Acquisition means for acquiring the master station identification information, storage means for storing the master station identification information set in advance, and the master station stored in the storage means when the master station identification information is acquired by the acquisition means It is characterized by comprising collating means for collating with station identification information and control means for controlling relay processing based on the collation result of the collating means.

  (4) In the configuration of (3), the terrestrial digital broadcasting system is a system based on an ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system, and the master station identification information is a broadcast TS (Transport Stream). : Network information table (NIT) packet included in the transport stream), the acquisition means describes the network identification information described in the NIT packet when the broadcast TS is decoded. The master station identification information is read out from.

  (5) In the configuration of (3), the control means limits the relay output of the broadcast radio wave based on a collation result.

  (6) In the configuration of (3), a plurality of relay processing systems are provided, and the control means selectively switches the processing system based on the collation result.

  (7) In a digital terrestrial broadcast relay station device used in a digital terrestrial broadcasting system and relaying broadcast radio waves from a master station device, the broadcast radio waves are received and added to the broadcast radio waves by the master station device. The acquisition means for acquiring relay station list information indicating relay station identification information in the relay route, the storage means for storing relay station identification information given individually in advance, and the relay station list information is acquired by the acquisition means A determination unit that determines whether or not the relay station identification information stored in the storage unit is included, and a control unit that controls relay processing based on a determination result of the determination unit. Features.

  (8) In the configuration of (7), the terrestrial digital broadcasting system is a system based on ISDB-T (Integrated Services Digital Broadcasting for Terrestrial), and the relay station list information is broadcast TS (Transport Stream). Is described as equipment_id (device identification information) in NSI (Network Service Information) of IIP (ISDB-T Information Packet) in the transport stream), and the broadcast TS is OFDM (Orthogonal Frequency Division Multiplex: orthogonal frequency division) When the NSI is placed in an AC (Orthogonal Frequency Division Multiplex-Auxiliary Carrier) region when being converted into a (multiplex) signal, the acquisition means decodes the OFDM signal Sometimes the relay station list from the equipment_id described in the AC area And wherein the reading out the broadcast.

  (9) In the configuration of (7), the control means limits the relay output of the broadcast radio wave based on the determination result.

  (10) In the configuration of (7), a plurality of relay processing systems are provided, and the control unit selectively switches the processing system based on the determination result.

  The relay station apparatus control method used in the digital broadcasting system according to the present invention is characterized by the following configuration.

  (11) In a relay station apparatus control method used in a digital terrestrial broadcasting system in which broadcast radio waves transmitted from a master station apparatus are relay-transmitted by a relay station apparatus, the master station apparatus transmits parent station identification information to the broadcast radio waves. The relay station device receives the broadcast radio wave, acquires the master station identification information added to the broadcast radio wave, stores the master station identification information set in advance, When the master station identification information is acquired, it is checked against the stored master station identification information, and the relay process is controlled based on the check result.

  (12) In a relay station apparatus control method used in a terrestrial digital broadcasting system in which broadcast radio waves transmitted from a master station apparatus are relayed and transmitted by a relay station apparatus, the master station apparatus relays the broadcast radio waves in a relay route. Relay station list information indicating station identification information is added and transmitted, the relay station apparatus receives the broadcast radio wave, and the master station apparatus acquires the relay station list information added to the broadcast radio wave The relay station identification information given individually is stored in advance, and when the relay station list information is acquired, it is determined whether or not the stored relay station identification information is included, and based on the determination result And controlling the relay processing.

  According to the present invention, in the relay station device, the master station identification information is compared with the prestored master station identification information, or the relay station list information is compared with the prestored relay station identification information to determine the presence / absence thereof. It is possible to provide a terrestrial digital broadcast system, a terrestrial digital broadcast relay station apparatus, and a relay station apparatus control method capable of detecting an abnormality due to interference interference and the like and easily suppressing output or switching an output system. it can.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing an embodiment of a digital broadcasting system based on ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) according to the present invention. In the master station (broadcast station) apparatus A1 shown in FIG. 1, when the terrestrial digital broadcast wave (OFDM signal) transmitted from the transmission antenna A2 reaches the relay station apparatus B and is captured by the reception antenna B1, the reception is received. The signal is amplified with low noise by the head amplifier (HA) B2, subjected to compensation processing such as transmission loss by the basic device B3, then amplified by the power amplifier B4 and retransmitted from the transmitting antenna B5. In the relay station apparatus B configured as described above, the signal detection apparatus B6 takes in the reception RF signal of the reception antenna B1 and performs the process shown in FIG. In the embodiment shown in FIG. 1, the input of the signal detection device B6 is the reception RF signal of the reception antenna B1, but it may be a retransmission RF signal output from the basic device B3.

  In FIG. 2, the received RF signal is converted into an IF or baseband signal by the frequency converter B61, then converted to a digital signal by the AD converter B62, and converted to data on the frequency axis by the fast Fourier transformer (FFT) B63. The error correction unit B64 performs error correction and a broadcast TS is obtained. This broadcast TS is sent to the NIT detection unit B65.

  The NIT detection unit B65 detects a NIT packet included in the broadcast TS, and the detected NIT packet is sent to the broadcast station ID detection unit B66. The broadcast station ID detection unit B66 detects a broadcast station (parent station) ID described as network identification information in the NIT packet, and the detected broadcast station ID is sent to the determination unit B67. This determination unit B67 collates the broadcast station ID set in advance in the broadcast station ID setting unit B68 with the broadcast station ID detected as described above, determines whether or not they match, and determines the determination result. Notify the power amplifier B4. When the determination result indicates a mismatch, the power amplifier B4 determines that there is an abnormality and stops the output of relay transmission.

  That is, in the embodiment shown in FIG. 2, a broadcast station ID (see Non-Patent Document 1) described as network identification information in the NIT packet of the broadcast TS is detected and collated with a preset broadcast station ID. If they match, it is determined that a normal route signal has been received, and retransmission output is continued. If the collation results do not match, it is determined that the received radio wave is interfering and signals of other routes are received, and retransmission output is stopped.

  On the other hand, in FIG. 3, the received RF signal is converted into an IF or baseband signal by the frequency conversion unit B61, then converted to a digital signal by the AD conversion unit B62, and on the frequency axis by the fast Fourier transform unit (FFT) B63. The data is returned to the AC detection unit B69. The AC detection unit B69 detects AC region data from the data on the frequency axis, and the detected AC region data is sent to the relay station ID detection unit B610. The relay station ID detection unit B610 detects relay station ID list information described as equipment_id (device identification information) in the NSI information from the AC region data, and the detected relay station ID list information is determined by the determination unit. Sent to B611. This determination unit B611 compares the relay station ID set in advance in the relay station ID setting unit B612 with the relay station ID list information detected as described above, and whether the set relay station ID is included in the list. It is determined whether or not, and the determination result is notified to the power amplifier B4. When the determination result is NO, the power amplifier B4 determines that the power amplifier B4 is abnormal and stops the relay transmission output.

  That is, in the embodiment shown in FIG. 3, relay station list information includes equipment_id (device service information) in NSI (Network Service Information) of an IIP (ISDB-T Information Packet) in a broadcast TS (Transport Stream). When the broadcast TS is converted into an OFDM signal by an NSI-AC device or the like (see Non-Patent Document 2) described as identification information) and placed in the upper station, the NSI is placed in the AC region The AC detection unit B69 detects data in the AC region, the relay station ID detection unit B610 reads the relay station list information from the equipment_id described in the AC region, and the determination unit B611 assigns the relay station to the own apparatus. It is determined whether the ID exists in the list. If it exists, it is determined that the signal of the normal route is received, and the retransmission output is continued. If it does not exist, it is determined that the received radio wave is interfering and a signal of another route is received, and retransmission output is stopped.

  Therefore, according to the above embodiment, in the system shown in FIG. 1, the signal detection process shown in FIG. 2 or FIG. It can be performed.

  FIG. 4 is a block diagram showing a configuration when the present invention is applied when the relay station apparatus B includes systems 1 and 2 of a spatial diversity configuration as an application of the above embodiment. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals, and different parts will be described here.

  In FIG. 4, relay station apparatus B includes system 1 and system 2, and both are configured in the same manner as the relay station apparatus shown in FIG. Specifically, the first system includes a head amplifier (HA) B21, a basic device B31, a power amplifier B41, a signal detection device B61, and a level detection device B81. The second system includes a head amplifier (HA) B22, a basic device B32, a power amplifier B42, a signal detection device B62, and a level detection device B82. The detection results of the signal detection devices B61 and B62 of each system are sent to the control unit B9, and the level detection results of the level detection devices B81 and B82 are also sent to the control unit B9. The control unit B9 outputs a status signal and an alarm signal based on the signal detection result and the level detection result. When an abnormality is detected, the control unit B9 sends an output switching signal to the switching device B7, and sends a normal system to the transmission antenna. Connect to B5 and connect the system in which the abnormality is detected to the dummy device B10. The control of the control unit B9 is also performed by an external control signal.

  In the above configuration, the processing operation will be described with reference to the flowchart shown in FIG.

  First, the output of the 1-system signal detection device B61, the output of the 2-system signal detection device B62, the output of the 1-system level detection device B81, and the output of the 2-system level detection device B82 are input respectively (steps S11 to S14, the respective detections). The presence or absence of abnormality is determined from the output (steps S15 to S18).

  In step S15, if an abnormality is detected from the output of the 1-system signal detector B61, sig1 = 1 is set (step S151), and if no abnormality is detected, sig1 = 0 is set (step S152). ). In step S16, sig2 = 1 is set when an abnormality is detected from the output of the 2-system signal detection device B62 (step S161), and sig2 = 0 is set when no abnormality is detected (step S162). ). In step S17, when an abnormality is detected from the output of the level detection device B81, rev1 = 1 is set (step S171), and when no abnormality is detected, rev1 = 0 is set (step S172). In step S18, when an abnormality is detected from the output of the level detection device B82, rev2 = 1 is set (step S181), and when no abnormality is detected, rev2 = 0 is set (step S182).

  After the above determination, it is determined whether any of sig1, sig2, rev1, and rev2 is “1” (step S19). If neither is “1”, the process returns to the initial step. If it is determined that there is “1” in step S19, it is determined that an abnormality has been detected, and the state transition process shown in FIG. 5 is performed by outputting an alarm output, a normal return status, and an output switching control signal. (Step S20). In step S20, an external control signal is also followed.

  FIG. 5 is a diagram showing an outline of the state transition based on the process of step S20.

  The explanation starts from the status (a) where output is stopped. Status (a) is normal for both system 1 and system 2, and output is stopped. When the 1st system output is instructed by the external control (2), the process proceeds to the status (b) and the 1st system is output. When 2 system output is instructed by the external control (2), it moves to status (c) and outputs 2 system. When the signal detection of system 1 detects an error (1) in status (b) and (c), it moves to status (e) and outputs an alarm (system 1 error), and control outputs system 2 To do. If signal detection of system 2 detects an error (1) in status (b) or (c), it moves to status (d) and outputs an alarm (system 2 error), and control outputs system 1. To do.

  If the signal detection of system 1 and system 2 detects an error (1) in status (b) and (c), it moves to status (h) and outputs an alarm (system 1 and system 2 error) Control stops output. If the 2 system signal detection detects an error (1) in the status (e) state, it moves to the status (h), outputs an alarm (1 system / 2 system error), and the control stops output. . If the signal detection of system 1 detects an error (1) in status (d), it moves to status (h) and outputs an alarm (system 1 and system 2 error), and control stops output. . When the device is reset by the external control (2) in the status (h), the status (a) is restored.

  From the above, according to the above embodiment, when there are a plurality of relay reception systems, it is possible to detect an abnormality in each system, and accordingly the state transition of the output system is appropriately performed based on the abnormality determination result of each system. Can be controlled.

  In the above embodiment, the space diversity system has been described as an example. However, the present invention can be similarly applied to a switching system between the active system and the standby system and a route diversity system. Further, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

1 is a block diagram showing an embodiment of a digital broadcasting system using an ISDB-T system according to the present invention. The block diagram which shows the specific structure of a signal detection apparatus in case the broadcast station ID is described as network identification information in the NIT packet of broadcast TS in the relay station apparatus shown in FIG. In the relay station apparatus shown in FIG. 1, when the relay station list information is described as equipment_id in the NIP of the IIP in the broadcast TS, and the broadcast TS is converted into an OFDM signal, the NSI is placed in the AC region. The block diagram which shows the concrete structure of the signal detection apparatus of. The block diagram which shows the structure at the time of applying this invention when the relay station apparatus B is provided with 1 system and 2 systems of a space diversity structure as an application of the said embodiment. The flowchart which shows the flow of the control processing of the control part shown in FIG. The figure which shows the outline | summary of the state transition based on the control processing shown in FIG.

Explanation of symbols

  A1 ... Master station (broadcast station) device, A2 ... Transmission antenna, B ... Relay station device, B1 ... Reception antenna, B2 ... Head amplifier (HA), B3 ... Basic device, B4 ... Power amplifier, B5 ... Transmission antenna, B6 , B61, B62 ... signal detection device, B61 ... frequency conversion unit, B62 ... AD conversion unit, B63 ... fast Fourier transform unit (FFT), B64 ... error correction unit, B65 ... NIT detection unit, B66 ... broadcast station ID detection unit , B67 ... determination unit, B68 ... broadcast station ID setting unit, B69 ... AC detection unit, B610 ... relay station ID detection unit, B611 ... determination unit, B7 ... switching device, B81, B82 ... level detection device, B9 ... control unit , B10: Dummy device.

Claims (12)

In a digital terrestrial broadcasting system that relays and transmits broadcast radio waves transmitted from a master station device using a relay station device,
The master station device adds master station identification information to the broadcast radio wave and sends it out,
When the relay station device receives the broadcast radio wave, acquires the master station identification information added to the broadcast radio wave, stores the master station identification information set in advance, and the master station identification information is acquired The digital terrestrial broadcasting system characterized by collating with the stored master station identification information and controlling the relay processing based on the collation result. In a digital terrestrial broadcasting system that relays and transmits broadcast radio waves transmitted from a master station device using a relay station device,
The master station device adds relay device list information indicating relay device identification information in the relay route to the broadcast radio wave and sends it,
The relay station device receives the broadcast radio wave, acquires relay device list information added to the broadcast radio wave at the master station device, stores relay device identification information given individually in advance, and stores the relay device A terrestrial digital broadcasting system characterized in that, when list information is acquired, it is determined whether or not the stored relay device identification information is included, and relay processing is controlled based on the determination result. In a terrestrial digital broadcast relay station device that is used in a terrestrial digital broadcast system and relays broadcast radio waves from a master station device,
An acquisition means for receiving the broadcast radio wave and acquiring the master station identification information added to the broadcast radio wave in the master station device;
Storage means for storing preset master station identification information;
When parent station identification information is acquired by the acquisition means, collation means for collating with the master station identification information stored in the storage means,
A terrestrial digital broadcast relay station apparatus comprising: control means for controlling relay processing based on a collation result of the collating means.   The digital terrestrial broadcasting system is a system based on an ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system, and the master station identification information is included in a broadcast TS (Transport Stream). Information Table: Network information management table) When the packet is described as network identification information, the acquisition means reads out the master station identification information from the network identification information described in the NIT packet when the broadcast TS is decoded. 4. The relay station apparatus for digital terrestrial broadcasting according to claim 3.   The terrestrial digital broadcast relay station apparatus according to claim 3, wherein the control means limits the relay output of the broadcast radio wave based on the collation result.   4. The relay station apparatus for digital terrestrial broadcasting according to claim 3, wherein a plurality of relay processing systems are provided, and the control unit selectively switches the processing systems based on the collation result. In a terrestrial digital broadcast relay station device that is used in a terrestrial digital broadcast system and relays broadcast radio waves from a master station device,
Receiving means for receiving the broadcast radio wave, adding to the broadcast radio wave at the master station device, and acquiring relay station list information indicating relay station identification information in a relay route;
Storage means for storing relay station identification information given individually in advance;
Determination means for determining whether or not the relay station identification information stored in the storage means is included when the relay station list information is acquired by the acquisition means;
A terrestrial digital broadcast relay station apparatus comprising: control means for controlling relay processing based on a judgment result of the judgment means.   The digital terrestrial broadcasting system is a system based on ISDB-T (Integrated Services Digital Broadcasting for Terrestrial), and the relay station list information is an IIP (ISDB-T) in a broadcast TS (Transport Stream). Information Packet (NSI) is described as equipment_id (device identification information) in NSI (Network Service Information), and when the broadcast TS is converted into an OFDM (Orthogonal Frequency Division Multiplex) signal, When the NSI is placed in an AC (Orthogonal Frequency Division Multiplex-Auxiliary Carrier) region, the acquisition means uses the equipment_id described in the AC region when decoding the OFDM signal. The relay station list information is read out. Terrestrial digital broadcast relay station device according to claim 7.   9. The relay station apparatus for digital terrestrial broadcasting according to claim 8, wherein the control unit limits the relay output of the broadcast radio wave based on the determination result.   8. The relay station apparatus for digital terrestrial broadcasting according to claim 7, wherein a plurality of relay processing systems are provided, and the control unit selectively switches the processing system based on the determination result. Used for terrestrial digital broadcasting system that relays and transmits broadcast radio waves transmitted from the master station device by the relay station device,
At the master station device, the master station identification information is added to the broadcast radio wave and sent out,
The relay station device receives the broadcast radio wave, acquires master station identification information added to the broadcast radio wave, stores preset master station identification information, and acquires the master station identification information A relay station apparatus control method for a digital terrestrial broadcasting system, wherein the relay station device is collated with the stored master station identification information and relay processing is controlled based on the collation result. Used for terrestrial digital broadcasting system that relays and transmits broadcast radio waves transmitted from the master station device by the relay station device,
At the master station device, the broadcast radio wave is added with relay station list information indicating relay station identification information in the relay route and sent out,
The relay station apparatus receives the broadcast radio wave, acquires the relay station list information added to the broadcast radio wave at the master station apparatus, stores relay station identification information given individually in advance, and stores the relay station information. When the station list information is acquired, it is determined whether or not the stored relay station identification information is included, and relay processing is controlled based on the determination result. Station device control method.

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