JP7116652B2 - wireless communication system - Google Patents

Description

The present disclosure relates to wireless communication systems, and is particularly applicable to digital broadcast communication systems that use multiple base stations for broadcasting.

One wireless communication system is a digital broadcast communication system. A digital broadcast communication system is a system that is developed on a municipal-by-municipal basis. It has master station equipment installed in city halls and slave station equipment installed in the households of residents, and the master station equipment sends voice messages to the slave station equipment. It is a system that provides disaster prevention information and notices to residents by reporting. FIG. 1 shows a configuration example of this system. A wireless communication system 10 includes an operation console 20 operated by a local government employee (also referred to as a user) A and a base station 1, and includes master station equipment (operation console 20, base station 1) installed in a city hall or the like, and residents. and a child station facility 30 installed on the side of B's household. The master station equipment (operation console 20, base station 1) of this system notifies disaster prevention information to the slave station equipment 30 by transmitting voice and data. The following radio standards exist for such systems:

"Municipal Digital Broadcast Communication System ARIB-STD-T86" Association of Radio Industries and Businesses "Municipal Digital Broadcast Communication System TYPE2 ARIB-STD-T115" Association of Radio Industries and Businesses

In a digital broadcast communication system, when multiple base stations are placed in close proximity, mutual interference must be considered.

On the other hand, when a user desires to construct a service area or operates systems with different wireless standards, there are restrictions on the installation location of base stations and for the convenience of securing service areas. must be contiguous.

However, due to the effective use of radio waves, there are cases where it is not possible to select frequencies that are not close to each other so that the frequencies that can be used by each system do not interfere with each other.

At this time, when the call control of the base stations of both systems is performed by one operator console, the timing of sending the call signals is the same, and interference occurs if the same or near frequencies are used.

Also, if one console is assigned to each system and call control of the base station is performed for each system, signal interference will not occur between the base stations, but the user must operate a plurality of consoles. Operation becomes complicated.

An object of the present disclosure is to provide a technology that enables broadcasting of both systems with a single operation using a single operator console in a wireless communication system in which different communication methods are mixed.

Other problems and novel features will become apparent from the description of the specification and the accompanying drawings.

A brief outline of a representative one of the present disclosure is as follows.

That is, a wireless communication system includes an operator console, a first base station, and a second base station that uses a different communication method from the first base station. The operator console notifies the voice to the first base station and records the voice at the same time. After completing the notification to the first base station, the operator console executes processing for notifying the second base station of the recorded voice.

According to the above wireless communication system, even in a wireless communication system in which different communication methods are mixed, a single operator console can be used to connect to the first base station and the second base station with a single operation. It is possible to broadcast.

1 is a diagram for explaining a configuration example of a digital broadcast communication system; FIG. 1 is a diagram illustrating a wireless communication system in which two wireless standards are mixed according to an embodiment; FIG. FIG. 3 is a diagram showing a communication range covered by one base station; FIG. 2 is a diagram showing communication ranges covered by two base stations; 8 is a diagram showing a communication sequence according to Comparative Example 1; FIG. FIG. 10 is a diagram showing a communication sequence according to Comparative Example 2; It is a figure which shows the communication sequence which concerns on embodiment. FIG. 10 is a diagram showing a communication sequence when monitoring slave station facilities according to a comparative example; FIG. 10 is a diagram showing a communication sequence when monitoring slave station facilities according to the embodiment;

Embodiments and comparative examples will be described below with reference to the drawings. However, in the following description, the same components may be denoted by the same reference numerals, and repeated descriptions may be omitted. In addition, in order to clarify the description, the drawings may be represented schematically as compared with actual embodiments, but they are only examples and do not limit the interpretation of the present invention.

FIG. 2 is a diagram showing a wireless communication system in which two wireless standards are mixed according to the embodiment.

Two wireless standards (STD-T86, STD-T115) with different modulation schemes use the same frequency band, but are not compatible in the wireless section. Municipalities basically adopt either standard to develop disaster prevention radio equipment, but depending on the development status of the municipality, both standards (STD-T86, STD-T115) are mixed as shown in Figure 2. It is also conceivable to carry out maintenance.

FIG. 3 is a diagram showing the communication range covered by one base station, and FIG. 4 is a diagram showing the communication range covered by two base stations. By installing a plurality of base stations 1 and 2 as shown in FIG. 4 in the communication range (service area) shown in FIG. 2 can be maintained. In the case of FIG. 4, base stations 1 and 2 are installed adjacent to each other in order to construct a service area. At this time, if one console 20 attempts to call and control a plurality of base stations 1 and 2, call signals are sent to the base stations 1 and 2 at the same time. However, if the frequencies are the same or close to each other, the frequencies interfere with each other, making it impossible to communicate with the slave station equipment (30, 31).

FIG. 5 is a diagram showing a communication sequence according to Comparative Example 1. FIG. In Comparative Example 1, one operator console 20 performs call control (call operation) for a plurality of base stations 1 and 2, and transmits voice to slave station equipment (30, 31). In the sequence of FIG. 5, the console 20 simultaneously sends call signals to the base stations 1 and 2 (see S60).

In this case, if the frequencies are different, it is possible to communicate with slave station equipment (30, 31). However, if the frequencies are the same or close to each other, the frequencies interfere with each other, making it impossible to communicate with the slave station equipment (30, 31).

FIG. 6 is a diagram showing a communication sequence according to Comparative Example 2. In FIG. In Comparative Example 2, a plurality of operator consoles (20, 20a) are provided, and the operator consoles and base stations are associated in a 1:1 ratio (operator console 20 and base station 1, operator console 20a and base station 2). The audio is transmitted at different times.

In this case, it is necessary for the user (A) to carry out the calling operation (70, 70a) on the operator console a plurality of times for one message desired by the user (A), which complicates the operation.

FIG. 7 is a diagram showing a communication sequence according to the embodiment. The communication sequence in FIG. 7 shows a communication sequence when a plurality of base stations (1 to n) are provided for one operator console 20. In FIG. Note that FIG. 7 shows only the base stations 1 and 2 for simplification of the drawing. In addition, the radio standard used by the base station 1 and the reception target (slave station equipment) 30 of the base station 1 and the radio standard used by the base station 2 and the reception target (slave station equipment) 31 of the base station 2 are different radio standards. Standard, but uses the same or nearby frequency bands. Similarly, the radio standard used by the base station 1 and the reception target (child station equipment) 30 of the base station 1, the other base stations (3 to n) and the reception target (child station equipment) of the base station (3 to n) The wireless standard used by station equipment) is a different wireless standard, but uses the same or a nearby frequency band.

The communication sequence will be described below.
User A performs a calling operation on the console 20 (step S1).
The console 20 sends a calling message to the base station 1 (step S2).
The base station 1 sends out a calling telegram to the reception target (slave station equipment) 30 under the control of the base station 1 (step S3).
The base station 1 sends a reportable telegram to the console 20 (step S4).
The console 20 establishes a voice path to the base station 1, and the user A transmits voice (step S5).
The voice is transmitted to the receiving target 30 via the base station 1 (step S6).
The console 20 records the transmitted voice at the same time as the transmission (step S7).
After finishing the voice transmission, the user A performs a call ending operation on the console 20 (step S8).
The operator console 20 sends an end-of-call message to the base station 1 (step S9).
The base station 1 sends a call termination message to the reception target (slave station equipment) 30 under the control of the base station 1 (step S10).

After entering the standby state, the operator console 20 sends a calling message to the next base station 2 without user A's operation (step S11).
The base station 2 sends out a calling telegram to the reception target (slave station equipment) 31 under the control of the base station 2 (step S12).
The base station 2 sends a reportable telegram to the console 20 (step S13).
The operator console 20 establishes an audio path to the base station 2 . The operator console 20 reproduces the voice recorded during the voice transmission of the base station 1 (step S14).
The reproduced voice is transmitted to the receiving target 31 via the base station 2 (step S15).
After finishing the voice transmission, the console 20 sends a call termination message to the base station 2 (step S16).
The base station 2 sends an end-of-call message to the reception target (slave station equipment) 31 under the control of the base station 2 (step S17).
After that, steps S11 to S17 are repeated until the notification of all receiving targets to be called is completed (step S18).

As described above, in controlling the base stations (1-n) from the console 20, the timing for calling the base stations (1-n) is controlled for each base station (1-n).

After the call operation by the user A, the call signal of the first base station (1) is sent out, and the slave station equipment 30 to be received by the first base station (1) is notified. At the time of voice transmission of this report, the voice transmitted by the user A is recorded on the console 20.例文帳に追加

After the user A performs the call termination operation, the call to the slave station 30 to be received by the first base station (1) is terminated. The console 20 spontaneously initiates a call to the second base station (2). At this time, for user A, since the same content is reported to the slave station equipment 31 to be received by the second base station (2), voice transmission is performed by the voice transmission of the first base station (1). Play back the audio recorded with . By using reproduced voice, the user A can transmit voice to a plurality of base stations (1 to n) by operating the console 20 only once. After the voice reproduction is finished, the console 20 spontaneously sends out the end-of-call signal. This is repeated for the number of base stations connected to the console 20 .

Therefore, even in the wireless communication system 10 in which different communication methods (STD-T86, STD-T115) are mixed, a single operator console 20 can be used to operate the first base station (1). and a second base station (2).

FIG. 8 is a diagram showing a communication sequence when monitoring slave station facilities according to a comparative example.

In the example shown in FIG. 8, the child station facilities 30 and 32 are subordinate to the base station 1, and the child station facility 31 is subordinate to the base station 2. In FIG. It is also assumed that slave station numbers 1, 2, and 3 are assigned to slave station facilities 30, 31, and 32 in this order. Although n base stations (1-n) are provided, only base stations 1 and 2 are shown in FIG.

As shown in FIG. 8, when monitoring the child station facilities (30, 31, 32), it is conceivable to monitor in order of the number of the child stations. In the case of this system configuration, it is necessary to switch the transmitting base station (1, 2) for each number of the slave station equipment (30, 31, 32) (see S90, S91, S92), increasing the switching time. In addition, there is a problem that the number of communication sequences in the wireless communication system increases due to monitoring, resulting in a long occupation time of the system.

FIG. 9 is a diagram showing a communication sequence when monitoring a slave station facility according to the embodiment. In the example shown in FIG. 9, as in FIG. 8, the slave station equipment (30, 32) is the first slave station equipment under the control of the base station (1), and the slave station equipment (31) is the base station (2). ) is the second slave station facility under the control of . It is also assumed that slave station numbers 1, 2, and 3 are assigned to slave station facilities 30, 31, and 32 in this order. Also, although there are n base stations (1-n), only base stations 1 and 2 are shown in FIG. 9 as in FIG. Also, the radio standard used by the base station 1 and the receiving targets (child station equipment) 30 and 32 of the base station 1 and the radio standard used by the receiving target (child station) 31 of the base station 2 and the base station 2 are different. A wireless standard, but using the same or nearby frequency bands. Similarly, the radio standard used by the base station 1 and reception targets (slave station equipment) 30 and 32 of the base station 1 and the wireless standard used by the base station 2 and the reception target (slave station) 31 of the base station 2 , The radio standard used by the other base stations (3 to n) and the reception target (slave station equipment) of the base station (3 to n) is a different radio standard, but uses the same or a nearby frequency band. .

The operation up to the call signal operation is the same as in FIG. After the end of the call of the base station 2, the monitoring call for each base station is started.

Step S101: The console 20 transmits a monitoring request to the receiving target 30 via the base station 1. FIG.
Step S102: The receiving object 30 returns a monitoring response to the console 20 via the base station 1. FIG.
Step S103: The console 20 transmits a monitoring request to the receiving target 32 via the base station 1. FIG.
Step S104: The receiving object 32 returns a monitoring response to the console 20 via the base station 1. FIG.
Step S105: The console 20 transmits a monitoring request to the receiving target 31 via the base station 2. FIG.
Step S106: The receiving object 31 returns a monitoring response to the console 20 via the base station 2. FIG.
Thereafter, the base stations are switched and repeated until the monitoring of the reception target of the base stations 3 to n is completed.
That is, after the call to the base station 2 ends, the console 20 starts monitoring calls to the plurality of first slave station facilities 30 and 32 under the control of the base station 1, and the plurality of first slave stations After receiving the monitoring responses from the facilities 30 and 32, a monitoring call is made to the second slave station facility 31 under the control of the base station 2. FIG.

In this way, by starting a monitor call (monitoring request) for each base station (each subordinate to each base station), it is possible to efficiently monitor slave station equipment. Therefore, the entire system occupation time can be reduced.

According to embodiments, one or more of the following effects can be obtained.

1) A plurality of base stations that transmit signals of the same frequency and use different communication methods can communicate without interference.

2) The user can make a report by operating the operator console once without having to operate each base station.

3) It is possible to efficiently monitor slave station equipment.

Although the invention made by the present inventor has been specifically described above based on the embodiments, it goes without saying that the invention is not limited to the above embodiments and can be variously modified.

1, 2: Base station 20: Operation console 30, 31, 32: Child station facility A: Local government employee (user)
B: Residents

Claims (2)

a console;
a first base station;
a second base station that uses a different communication method from the first base station;
a plurality of first child station facilities under the control of the first base station;
a second slave station facility under the second base station ,
The console is
Notifying voice to the first base station and recording the voice at the same time;
After completing the notification to the first base station, executing a process of notifying the second base station of the recorded voice ,
After the end of the call to the second base station, start a monitoring call of the plurality of first child station facilities;
After receiving the monitor responses from the plurality of first slave station facilities, perform a monitor call to the second slave station facility;
wireless communication system. In claim 1,
A radio communication system, wherein a signal transmitted by the first base station and a signal transmitted by the second base station are in the same or adjacent frequency bands.

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