JP6202612B2 - Wireless communication system and wireless communication apparatus - Google Patents

Description

  The present invention relates to a wireless communication system and a wireless communication apparatus.

  A wireless communication system that performs wireless communication between a master station and a slave station is known. For example, a transmission wave transmitted from a master station is received by a fixed slave station or a movable slave station.

  Conventionally, in a wireless communication system, line quality is determined on the receiving side, and information on the determination result is transmitted to the transmitting side (see, for example, Patent Document 1).

  Also, as a broadcast radio system in municipalities, there is a municipal digital broadcast communication system defined by ARIB STD-T86 (Non-patent Document 1) formulated by the Japan Radio Industry Association.

JP 2010-206759 A

Municipal digital broadcast communication system, ARIB STD-T86, The Japan Radio Industry Association

Conventionally, in the broadcast communication system, the master station cannot collect the reception quality of the slave station.
An object of the present invention is to enable a master station of a broadcast communication system to collect the reception quality of a slave station.

  A wireless communication system of the present invention includes a master station, a first base station and a second base station connected to the master station, and a wireless communication apparatus that performs wireless communication with the first base station and the second base station. The master station transmits a broadcast to the wireless communication device via the first base station, and the wireless communication device receives the broadcast transmitted from the first base station in the first communication method. And a first transmission unit that transmits information to the master station via the second base station using the second communication method, and when the first reception unit receives the broadcast, Information on reception quality is transmitted from the first transmission unit to the master station.

  Further, in the wireless communication system according to the present invention, before the master station transmits the broadcast via the first base station, the master station transmits the broadcast start information indicating that the broadcast is to be performed via the second base station. The wireless communication device includes a second reception unit that receives broadcast start information from the second base station using the second communication method, and the second reception unit receives the broadcast start information. Then, the information regarding the reception quality of the broadcast received by the first receiver is transmitted from the first transmitter to the master station.

  Furthermore, the present invention is the above-described wireless communication system, wherein the wireless communication device is configured such that the first receiver does not receive the broadcast even after a predetermined time has elapsed since the second receiver received the broadcast start information. Is characterized in that information indicating that the broadcast could not be received as information relating to reception quality is transmitted from the first transmission unit to the master station.

  In the wireless communication system according to the present invention, when the master station receives information indicating that the second base station has not been able to normally receive the broadcast as the reception quality information from the wireless communication apparatus, the master station transmits the information to the wireless communication apparatus. The broadcast is rebroadcast by the second communication method via the two base stations.

  A radio communication apparatus according to the present invention is a radio communication apparatus that performs radio communication with a first base station and a second base station connected to a master station, and transmits a broadcast transmitted from the first base station to a first base station. A first receiving unit that receives the first communication unit via the second base station and a first transmission unit that transmits information to the master station using the second communication method via the second base station. When a broadcast is received, information regarding the reception quality of the broadcast is transmitted from the first transmission unit to the master station.

  According to the present invention, the master station of the broadcast communication system can collect the reception quality of the slave stations.

1 is a block diagram of a wireless communication system according to an embodiment of the present invention. 1 is a block diagram of an outdoor slave station and a bidirectional door-to-side receiver of a wireless communication system according to an embodiment of the present invention. It is a sequence diagram of the collective notification of ARIB STD-T86. It is a sequence diagram of the radio | wireless communications system which concerns on one Example of this invention. 6 is a flowchart of a radio communication system according to another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a wireless communication system according to an embodiment of the present invention.
In FIG. 1, a broadcast system is used, for example, for reporting disaster-related information from an administrative institution to residents in the event of a disaster, and the master station 100 transmits a broadcast wave (via a broadcast wave radio base station 110). (Broadcast Radio) The broadcast information transmitted by C11 is received by an outdoor slave station 111 and a bidirectional door-to-side receiver 112 which are a plurality of wireless communication devices (slave stations) installed at a predetermined place.
The outdoor slave station 111 outputs the received notification information by voice from a trumpet type speaker or the like.

  As a specific example, in a digital broadcast radio system for disaster prevention administration by the TDMA-TDD system, which is a municipal digital disaster prevention radio communication system in a 60 MHz band (54 to 70 MHz), a broadcast wave radio base station 110 using a broadcast radio line. And a function of making a report using voice information, other code information, or the like with the outdoor slave station 111 or the bidirectional door-to-door receiver 112 which is a wireless communication device (slave station).

  Further, the master station 100 uses the radio wave C21 having a frequency different from that of the broadcast wave C11 from the radio base station 120 in order to collect the reception quality of the broadcast wave C11 of the outdoor slave station 111 and the bidirectional type individual receiver 112. For example, the frequency and communication system different from the broadcast wave C11 use a duplex system in the 920 MHz band (915 to 930 MHz).

FIG. 2 is a block diagram of an outdoor slave station and a bidirectional door-to-side receiver of a wireless communication system according to an embodiment of the present invention.
An outdoor slave station 111 and a bidirectional door-to-door receiver 112, which are wireless communication devices (slave stations), include a broadcast wave receiving unit 201, a wireless unit 202, and a CPU (Central Processing Unit) unit 203.
The broadcast wave receiving unit 201 receives the broadcast wave C11 transmitted from the broadcast wave radio base station 110.
The wireless unit 202 performs transmission / reception with the radio base station 120 and the radio wave C21 for answer back to the master station 100. When the outdoor slave station 111 and the bidirectional door-to-door receiver 112 are outside the communication area of the wireless base station 120, transmission / reception with the wireless base station 120 is performed via the relay station 121.
As described above, the outdoor slave station 111 and the bidirectional door-to-door receiver 112 have two radio units that communicate with the broadcast wave radio base station 110 and the radio base station 120 using different communication methods on different channels. Yes.
The CPU unit 203 controls the broadcast wave receiving unit 201 and the radio unit 202.

(Description of reception quality)
FIG. 3 is a sequence diagram of the collective notification of ARIB STD-T86. Details of the reception quality of the slave station will be described with reference to FIG.
The reception quality includes “normal reception”, “follow-up”, “out of synchronization during reception”, “cannot receive”, and the like.
In the case of digital radio, it is necessary to synchronize radio frames on the receiving side, and normal reception cannot be performed unless radio frames are synchronized.

  If the slave station cannot synchronize the wireless frame at all during the sequence shown in FIG. 3, the slave station cannot receive any sound, so that no broadcast is output from the speaker. In this case, it cannot be received.

  The slave station may lose synchronization of the radio frame during the sequence of FIG. In this case, the sound is interrupted from the middle or the sound is interrupted. This is “out of synchronization during reception”, and there is a high possibility that the broadcast content is not accurately transmitted.

  In addition, the slave station may synchronize the radio frame after a certain amount of time has elapsed since the start of broadcasting. If the slave station cannot receive the PCH call start instruction (301) (302) and the FACCH number notification (303) in the sequence shown in FIG. 3 and the radio frame is synchronized in the TCH audio portion thereafter, the PCH call start instruction is issued. Since (301) (302) and FACCH number notification (303) have not been received, it is unclear who the subsequent TCH (voice) (305) is addressed to, and TCH (voice) (305) is output from the speaker. It will never be done. Such a case is “follow-up” and the broadcast content is not transmitted.

If the slave station has received all of the PCH call start instruction (301) to the PCH forced disconnection instruction (306) in the sequence of FIG. 3, it can determine that it is “normal reception”.
In addition, there may be a problem such as failure between the master station 100 and the broadcast wave base station 110 or in the broadcast wave base station 110, and the broadcast wave itself may not be transmitted. In this case, it cannot be received.

(Collecting reception quality of slave stations)
FIG. 4 is a sequence diagram of a radio communication system according to an embodiment of the present invention.
The master station 100 sends a broadcast activation instruction to the broadcast wave radio base station 110 in order to transmit the broadcast information to the outdoor slave station 111 and the bidirectional door-to-door receiver 112 using the broadcast wave C11 (401).
The broadcast wave radio base station 110 issues a notification activation instruction to the outdoor slave station 111 and the bidirectional door-to-door receiver 112 (402).

The master station 100 transmits voice data as broadcast information to the broadcast wave radio base station 110 (403).
The broadcast wave radio base station 110 transmits voice data as broadcast information to the outdoor slave station 111 and the bidirectional door-to-door receiver 112 (404).
After completing the transmission of the audio data that is the broadcast information, the master station 100 issues an instruction to end the broadcast wave radio base station 110 (405).
The broadcast wave radio base station 110 issues an end-of-call instruction to the outdoor slave station 111 and the bidirectional door-to-door receiver 112 (406).

Next, in order to collect the reception quality of the outdoor slave station 111 and the bidirectional type individual receiver 112, the master station 100 instructs the radio base station 120 that uses the radio wave C21 having a frequency different from the broadcast wave to collect the reception quality. (407).
The radio base station 120 instructs the relay station 121 to transmit the reception quality in order to collect the reception quality of the slave stations (408).

  The relay station 121 instructs the outdoor slave station 111 to transmit the reception quality (408). The outdoor slave station 111 transmits the reception quality to the relay station 121 (410). The relay station 121 transmits the reception quality of the outdoor slave station 111 to the radio base station 120 (411). The radio base station 120 transmits the reception quality of the outdoor slave station 111 to the master station 100 (412).

The relay station 121 issues a reception quality transmission instruction to the bidirectional door-to-door receiver 112 (413). The bidirectional door-to-door receiver 112 transmits the reception quality to the relay station 121 (414). The relay station 121 transmits the reception quality of the bidirectional door-to-side receiver 112 to the radio base station 120 (415). The radio base station 120 transmits the reception quality of the bidirectional door-to-door receiver 112 to the master station 100 (417).
In addition, when the outdoor slave station 111 and the bidirectional door-to-door receiver 112 are within the communication area of the radio base station 120, direct transmission / reception with the radio base station 120 may be performed without using the relay station 121.

  The master station 100 can collect the reception quality that is the reception status of the broadcast information (audio data) transmitted from the broadcast wave radio base station 110 by executing the above-described processing.

Note that the radio base station 120 may collect the reception qualities of a plurality of slave stations and then collectively transmit them to the master station 100.
In addition, when the slave station such as the outdoor slave station 111 or the bidirectional door-to-door receiver 112 receives the broadcast wave C11 with a reception quality other than “normal reception”, the master station 100 receives the relay station 121 from the radio base station 120. Then, the content transmitted by the broadcast wave C11 may be retransmitted from the radio base station 120 to the slave stations such as the outdoor slave station 111 and the bidirectional door-to-door receiver 112.

(The master station informs the slave station in advance that notification information will be transmitted)
Next, the operation of another embodiment of the present invention will be described.
The master station 100 transmits the broadcast information to the slave stations such as the outdoor slave station 111 and the bidirectional door-to-door receiver 112 before transmitting the broadcast information from the broadcast wave radio base station 110 or in parallel. In addition, the broadcast wave radio base station 110 is informed of the transmission of broadcast information via the relay station 121, and the transmission of reception quality, which is the reception status of broadcast information from the broadcast wave radio base station 110, is instructed.

  The slave stations such as the outdoor slave station 111 and the interactive type door-to-door receiver 112 receive the broadcast quality from the broadcast wave radio base station 110 or after a predetermined time has elapsed from the broadcast start time, Transmit to the master station 100 via the base station 120.

  As a result, the slave stations such as the outdoor slave station 111 and the interactive type door-to-door receiver 112 can know that the broadcast is performed from the master station 100 even in a situation where the broadcast base station 110 cannot receive the broadcast. , “Cannot be received” can be determined more reliably. As a result, the master station 100 can collect the reception quality of the slave stations more reliably and accurately.

(Resending is text information)
The operation of another embodiment of the present invention will be described with reference to FIGS.
FIG. 5 is an example of a flowchart of a wireless communication system according to another embodiment of the present invention.
The master station 100 starts voice transmission by broadcast notification to the slave stations such as the outdoor slave station 111 and the bidirectional door-to-door receiver 112 (S501), and ends the broadcast notification after the voice transmission ends ( S502).

The master station 100 stores the communication record of the broadcast notification (S503), and determines whether or not there is reception information of the slave station to be collected (S504).
If there is reception information of the slave station to be collected (YES), the master station 100 proceeds to the process of S505, and if there is no reception information of the slave station to be collected (NO), the master station 100 ends the process.

  The master station 100 transmits a polling signal via the radio base station 120 and the relay station 121 in order to collect the reception quality of the slave stations (S505).

  The slave station transmits the reception quality of the broadcast information to the master station 100 via the relay station 121 and the radio base station 120 (S506).

The master station 100 receives the reception information from the slave station (S507), and displays the reception quality on a display unit (not shown) (S508).
The master station 100 determines whether the collection of the reception quality of the slave station by polling is completed (S509), and proceeds to the processing of S510 when the collection of the reception quality is completed (YES) or after a predetermined time has elapsed. If reception quality collection has not ended (NO), the process returns to S506.

  The master station 100 determines the presence or absence of broadcast information reception failure based on the collected reception quality of the slave stations (S510). If reception of some of the slave stations fails (YES), the process of S511 is performed. If all of the slave stations have not failed to receive (NO), the process ends.

  The master station 100 converts the broadcast information (voice data) that the slave station has failed to receive into character information (S510), and transmits it from the radio base station 120 to the slave station via the relay station 121 (S512).

The slave station receives the character information transmitted from the radio base station 120 (S513), converts the character information into an audio signal (S414), and outputs the sound from a speaker (not shown) (S515).
Then, the process of FIG. 5 ends.

  By executing the processing of FIG. 5, even if the slave station fails to receive the broadcast information of the broadcast radio, the master station uses the radio communication system different from the broadcast radio in accordance with the reception status of the slave station. Therefore, the slave station can reliably receive the broadcast information without fail.

  Although the present invention has been described in detail above, the present invention is not limited to the wireless communication system and the wireless communication device described herein, and can be widely applied to wireless communication systems and wireless communication devices other than those described above. Needless to say, you can.

  100: master station, 110: radio base station for broadcast waves, 111: outdoor slave station, 112: dual-method door-to-door receiver, 120: radio base station, 121: relay station.

Claims (3)

A master station, a first base station and a second base station connected to the master station, and a wireless communication device for performing wireless communication with the first base station and the second base station,
The master station transmits an audio broadcast to the wireless communication device via the first base station,
The wireless communication device
A first receiver that receives the audio broadcast transmitted from the first base station in a first communication method;
A first transmission unit that transmits information to the master station in a second communication scheme via the second base station,
Upon receiving the audio broadcast at the first receiving unit, and transmits to the master station the information about the reception quality of the audio broadcast from the first transmitting portion,
When the master station receives from the wireless communication device information indicating that the second base station has not successfully received the audio broadcast as information regarding the reception quality, the master station converts the audio data of the audio broadcast into text information. A wireless communication system, wherein the character information is transmitted to the wireless communication apparatus via the second base station by the second communication method. The wireless communication system according to claim 1, wherein
Before transmitting the audio broadcast via the first base station, the master station transmits broadcast start information indicating that the broadcast is to be performed to the wireless communication device via the second base station,
The wireless communication apparatus includes a second reception unit that receives the broadcast start information from the second base station by the second communication method, and when the second reception unit receives the broadcast start information, Then, the wireless communication system, wherein the information related to the reception quality of the audio broadcast received by the first receiving unit is transmitted from the first transmitting unit to the master station. The wireless communication system according to claim 2, wherein
The wireless communication device relates to the reception quality when the first reception unit does not receive the audio broadcast even after a predetermined time has elapsed since the second reception unit received the broadcast start information. A wireless communication system, wherein information indicating that the audio broadcast could not be received as information is transmitted from the first transmission unit to the master station.

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