JPS63103526A - Radio paging communication system - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention is intended to improve communication between a large number of workers and
This is related to a wireless communication system using weak radio waves used between work leaders and workers (prior technology and its problems) In these construction works, many people involved in the construction work together to carry out dangerous construction work. It is necessary for the construction supervisor to give instructions to the workers during the construction work, or to maintain communication among the construction workers, and it is essential to ensure the safety of the work. More and more wireless paging communication systems are used.

As shown in Figure 1, the outline of this system is based on commands issued by the construction commander, who usually uses a JJI near the site, a hot wire machine (for example, 2), or is located at the wireless L1 base station 1. , communication is carried out between the multiple ministries actually in charge of the construction work using portable wireless devices (for example, 3 to 7).

The basics of the system are simultaneous transmission and reception, continuous transmission, and 1j
T-band radios are used hands-free. A plurality of slave stations that mainly use mobile phone communication under a master station (wireless base station) make up one system.

If the frequency of calls between the master station and the portable wireless device is low, it can accommodate a large number of 11 (hot wire devices),
, band radios use the same frequency, and while one portable radio is transmitting, other portable radios do not talk and are transmitting, so the frequency is shared by multiple stations. has been done.

Also, if there are frequent calls between the master station and the mobile radio, the IJt band radios in the group may be able to transmit radio waves at two frequencies, for example, and one frequency may be used by another mobile radio. There is also a method in practical use that uses a rather expensive mobile phone or 1ljf line machine, which switches to a different frequency and transmits when the signal is off.

Recently, as shown in Figure 1(b), we have used a frequency synthesizer that can use any one frequency out of a number of completed frequencies, as well as the Marubuchi (Nel-Acres) technology. It has been proposed in J: of b.

The service area that can be used for the above-mentioned portable radio equipment is approximately 1 yen 75 r from the master station Ambuna.
It will be about n. This uses ↑j (so-called weak radio waves stipulated by the Radio Law as the transmission output of the heating wire machine,
No radio station license is required and therefore economical radio equipment is used.

In other words, according to Article 6 of the Radio Law Enforcement Regulations, as a radio station that does not require a license, "111.
It is stipulated that the electric field intensity at a distance of 100 meters to 15 meters is less than 15 microvolts, and if the above-mentioned portable radio is used in accordance with this regulation,
Will the cost of equipment be low, and will the relative distance between a portable radio and a radio station that can communicate be up to 7577? Moderation is the limit. Therefore, when a wider fence service area was required, it was necessary to use antenna distribution and various repeaters (distributed transmitter/receiver, two-way beam, -star, etc.) to secure a wide area service area. .

However, in order to expand the service area by δ using the above technology, a large number of fixed wireless stations are required. Special attention had to be paid to the placement of fixed stations in order to avoid so-called dead zones, where radio waves could not be received. Conversely, if there is an area where radio waves from both fixed stations can be received, this area will be subject to radio interference, so it is necessary to use different frequencies for each station.

However, recently in Japan, compared to the above-mentioned weak radio wave radio equipment called premises radio station equipment, equipment with relatively thick electric horns (approximately 10mW at the transmitter output end) is required to obtain a simple radio station license. I was told that permission would be granted only through formalities.

If this i1M wireless network is used, the service area will be greatly expanded from the master station Ambuna to a radius of 300 m outdoors and 100 m indoors. It has now become possible to realize a new system that can be applied to large, large-scale service areas and has high frequency utilization.

(Object of the Invention) The present invention provides that signals for n=f output to a large number of portable radio devices are transmitted from a radio base station that can be received in the entire area including a plurality of service areas, and simultaneously transmitted from a radio base station located in a surrounding area located in a plurality of service areas. In addition to transmitting from the radio station, transmission and reception from the multiple portable radios are also carried out within one service area, and an independent communication path is created between the construction leader at the calling radio base station and each portable radio. The present invention provides a wireless paging communication system that allows communication to be performed without interference with other communication channels.

(Structure and operation of the invention) Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a layout diagram showing the basic configuration of the present invention. In Figure 2, 8 is a wireless base station where the construction commander is stationed;
9 to 16 are portable radios owned by each construction worker, R1
-R6 is each service area, R is world glue - Ichisuej
The entire service area of the wireless base station 8 includes Noah R1 to 1<6. The portable radio equipment owned by construction workers uses multi-channel access (hereinafter referred to as "rMC") technology, which has recently been developed and is widely used in various wireless systems, especially mobile radio systems. In addition, each portable radio device used in the present invention is given a number (self-identification number: abbreviated as ID) that is different from other portable radio devices, and the wireless base station When a calling radio wave including an ID issued from 8 is received, a speaker or the like sounds through the receiving section and the received contents are displayed on the display section.

Now, there is a construction leader at the wireless base station 8 in the center of Figure 2, and there is an area [<(
Suppose you want to give construction instructions to construction workers inside a large circle. Area R in FIG. 2 indicates an area where the low power, 〒'2 frequency fc1 for calling emitted from the wireless base station 8 can be received, and the portable wireless devices 9 to 16 within this area R are It is assumed that the transmission radio wave for ejection from the base station 8 can be received well. Note that this calling signal is used as one control word in the present invention.

In addition, if there are portable radios in the 1Nahis area old to R6 in the same figure, the radio waves transmitted from these portable radios (18)
Weak radio waves) are transmitted from surrounding radio station R1 in each service area.
1 to R15 (the same applies to the wireless base station 8), indicating the range where good reception can be achieved. In addition, surrounding wireless stations R11 to R15
In accordance with instructions from the radio base station 8, a transmitter (rax> is also installed) that performs transmission at exactly the same frequency (the modulation signal is also the same) as the control transmission frequency rct of the radio base station 8. In addition, as shown in the figure, each peripheral radio station has a control radio channel receiver Rax and a telephone radio transmitter TXI.
and IX2, radio reception for telephone calls 1jlRxl and Rx2 are installed. Further, it is assumed that each of the peripheral radio stations R11 to R''15 and the wireless base station 8 are connected by a wired or wireless transmission path.
The 62 location of 15 is located at an important point in the implementation of the construction work, such as a monitoring site for instruments in the factory, a station for construction personnel, a place where maintenance and inspections are frequently performed, etc. It is installed in a place with good radio wave propagation characteristics.

Now, to begin the construction work, the construction worker turns on the power switch of his/her portable radio.

Then, a search begins to capture the control channels transmitted from the surrounding radio stations, and as a result, the downlink (from the surrounding radio stations to the portable radio) that is constantly transmitted from each surrounding radio station starts.
A control channel (frequency fc1) is acquired. However, this can only be captured by mobile radios within the service area of the 322 radio station, and other mobile 7! ! ! The line equipment cannot be acquired and therefore any calls (as described below) are not possible. Whether or not a call can be made can be determined by the following means.

That is, the construction worker 9 who wants to talk to the construction commander moves to the 4 novice areas R1 to R6 and presses the call button on the portable radio (when the lamp indicator, which will be explained below, turns blue), press the call button. It is also possible to provide a function that allows calls to be made automatically without any trouble), and transmits radio waves (frequency fcl). Whether or not you have moved to a service area where you can make a call (31) A lamp display is attached to your mobile radio and δ2 is displayed to indicate whether you can make a call or not. )T! By adopting a circuit configuration that receives control radio waves transmitted from a wireless station, and lights up a blue lamp if the received electric field value is above a certain level, and a red lamp if it is lower than that. , it becomes possible to judge whether or not it is possible to make a call.

Next, it is assumed that the construction worker who owns the portable radio device 9 needs to ask the construction supervisor for instructions.

In this case, if the location 1 is in any of the six 4 no-hiss areas R1 to R6, for example, area R1, then area R1
peripheral radio station R11 (fcl) located in the center of
>'g is used to transmit a calling signal.

10, and it is assumed that no prior communication has been conducted with the peripheral radio station R11. In this case, within the service areas of other peripheral radio stations R2 to R6, no radio interference will occur even if other mobile terminals use the same radio frequency fc2 to communicate with the respective peripheral radio stations. This is an advantage due to the weak radio waves, and as shown in the figure, it is due to the fact that Noah R1 to R6 are largely independent and are separated from each other from their respective areas. The call request signal is transmitted to the 7yB< line base station 8 via the 322nd line radio station R11.

Figure 3 is a concrete conjunctive diagram of this system, in particular, 417 non-mobile devices (9-16), 1 peripheral radio station (R11-R15)
3 is a diagram for explaining signal transmission between the wireless base station 8 and the wireless base station 8. FIG.

Hereinafter, using the embodiment shown in FIG. 3, a method of communication between the construction commander at the calling radio base station 8 and the construction workers 9 located within the service areas R1 to R6 will be explained.

Further, the flow of operation is not shown in FIG.

Now, a call request signal ■(
Frequency fc2> is received by the peripheral radio station R11 and transmitted to the via C radio base station 8 via the transmission path (■@ see FIG. 4). 1; M line base station 8 which received this sends the ID signal transmission command signal ■ to the (J5 band radio) as a paging radio wave (frequency f
jj (to the heating wire device 9) via the transmission line. At the same time, the ID code is sent to the portable radio device 9 using the control channel (fcl, the frequency is the same as the calling radio wave) from the surrounding radio station via the transmission path. The sending command signal is sent ■′■″. That is,
A control signal for an ID signal transmission command is sent to the portable radio device 9 using control signal transmission transmitters installed at all peripheral radio stations included in the area.

On the other hand, the 1it) heating wire machine 9 that received this has its own I
■ Send D signal. Nearby radio station R11 that received this
Then, the signal (2) is transmitted to the wireless base station 8 via the transmission path. The control and communication channel A7 control unit of the radio base station 8 receives this signal and determines the communication channel to be assigned to the portable radio device 9. That is, communication channels already in use in the old service area are excluded, channels that can be assigned are determined, and a communication channel designation signal is transmitted to the portable radio device 9 using the paging radio wave (frequency fc1). At the same time, the same signal is transmitted to the surrounding radio stations R11 to R15 via the transmission path, and from R11 to R15, the mobile terminal 12'a9 is transmitted using the same control channel (radio frequency fcl) as described above.
■´■″ The destination call channel designation signal is sent.

The reason for transmitting the same signal at the same frequency, at the same time, using all the transmitters in the wireless area R as described above is as follows.

■The signal transmission reliability of control signals is improved by the transmission diversity effect.

■There is no other jJ in the control signal sent to the portable radio device 9! ; Band wireless) Waiting for calls from Iku (temporarily suppressed)
By inserting a V signal, you can prevent radio wave interference emitted from other portable radios before carrying your phone, just in case. This is effective when call traffic occurs from a large number of portable radios at the same time.

Incidentally, in some cases, if there is no need for the peripheral radio stations to transmit for the above purpose, it is possible to omit transmission from some or all of the peripheral radio stations. By doing so, it is possible to partially omit equipment for synchronizing with the transmission frequency fc1, and economicalization becomes possible. Therefore, there is a strong demand for economicalization of the system.
5 (including radio station 8) will not be installed.

As described above, the mobile radio 1a9 that has received the communication channel designation signal selects the specified communication channel (for example, C[11, the frequency is fl for mobile radio transmission, and F'l for radio base station transmission).
), switch the transmitter/receiver to standby, and send out a cutting completion signal■. On the other hand, after receiving the switching completion signal, the radio base station 8 connects the telephone radio transceiver xl installed at the peripheral radio station R'11 via the transmission path to the same channel as the mobile radio 9. I can do it.

When the above-mentioned operations are completed, the portable radio device 9 owned by the construction worker becomes able to communicate with the construction commander at the radio base station 8, and it becomes a town function to receive construction instructions. When the call ends, if the power of the portable radio device 9 is turned off, a call end signal is sent to the surrounding radio station R11 (■). In response to this, the peripheral radio station R11 turns off the transceiver used for the call and returns to a standby state. FIG. 4 is a flowchart showing the processing of the above signals.

In the service areas R1 to R6, two transmitters for communication are installed, so it is possible to communicate with the construction commander of the radio base station 8 via the surrounding radio station R11.

Similarly, each of the surrounding wireless stations R12 to R15 is equipped with one transmitter for calls and two receivers for calls, so
It can be seen that in each service area, two owners of portable wireless devices can talk to the wireless base station, and a total of 1 to 10 people can talk at the same time.

Now, as is clear from the above explanation, the audio signal of frequency f1 emitted from the portable radio device 9 is transmitted to the peripheral radio station R11.
The wireless base station 8 is equipped with an audio mixing circuit VMIX, and the audio signals of other construction workers received by the surrounding wireless stations R11 to R15 are received by the wireless base station 8, demodulated, and transmitted to the wireless base station 8 via a transmission path. The signal is mixed with an audio signal and sent out from the speaker SP/) 1 of the wireless base station 8.

1), the construction leader at the radio base station 8 will respond to the construction worker who has called for instructions using the microphone MIC shown in FIG. In other words,
As is clear from FIG. 3, the output of the microphone MIC is transmitted to each peripheral radio station via a transmission path, modulated by each peripheral radio station, and transmitted to the 11° C. band radio device 9 using C weak radio waves. Therefore, the construction leader at the wireless base station 8 can communicate with any construction worker. The reason why the radio base station 8 is equipped with the audio mixing circuit VMIX is because the construction commander wants to communicate with a plurality of construction workers at the same time, and if it is not necessary, it is not necessary to install the audio mixing circuit VMIX.

On the other hand, suppose that the construction leader at the calling radio base station 8 wants to give instructions to a specific construction worker. In this case, the construction leader will be called using a calling radio (for sending control signals), and the number 1 service area (for calling radio) is surrounded by the person-shaped circle R in Figure 2. Since the area is large, it is necessary to be able to call all the workers working on the construction. The form of the call signal is a tone.

Alternatively, they use digital signals and are designed to call only a specific portable radio.

The process from calling by a control signal to setting a communication channel is exactly the same as that shown in FIG.

Note that in some cases, certain rules may be imposed on the PID assignment method so that the portable radio owner can call out to a group of people.

Furthermore, in construction sites that require a large amount of traffic, and when the number of nearby wireless stations as shown in Figure 2 increases, and the service areas of the surrounding wireless stations come into contact with each other, portable wireless devices that use weak radio waves may be used. Advanced functionality is required.

For example, it is necessary to use one type of frequency synthesizer using MCA technology to enable the number of channels that can be used by one portable radio to be 100 waves or more.

The control and communication channel control section of the radio base station 8 must be conscious of using different communication channels in the service areas R1 to R6. Similarly, there is no surrounding area, ¥
It goes without saying that it is necessary to vary the transmission frequency of the communication channel transmitter TXI from the second base station to the service area R1~] (to prevent interference from occurring).

(Effects of the Invention) As explained above, by using the present invention as a substitute for the conventional wireless paging system, it is possible to easily expand the service area, which has been economically or technically difficult to realize until now. In addition to this, it becomes possible to effectively utilize the frequencies of low-power radio equipment and radio equipment that uses weak radio waves, and it also makes it possible to construct an economical system, which improves construction efficiency and safety. It is clear that we can make a significant contribution in this area.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an overview of a conventional system, Fig. 2 is a basic configuration diagram of the present invention, Fig. 3 is an explanatory diagram showing an embodiment of the present invention, and Fig. 4 is an explanation of system operation according to the present invention. This is a diagram. 8... Wireless base station, 9.10.11, 12, 13, 14, 15.16...
...Mobile radio practice, R...Service area of wireless base station 8, R
1, R2, R3, R4, R5, R6...Revis area, R11, R12, R13, R14, R15...
Peripheral radio station, VMIX...Choice mixing circuit, TDS...Tone or digital signal generator. Patent applicant: Iwasaki Tsushinki Co., Ltd. Figure 1

Claims (1)

[Claims] A radio transmitting station that transmits a paging radio wave that can be received in a predetermined area including a plurality of service areas, and a weak radio wave that is coupled to the radio transmitting station via a transmission path and whose area is one of the plurality of service areas. A fixed wireless station network is configured with a wireless station, and a plurality of portable wireless devices using weak radio waves existing in an area including the plurality of service areas can communicate with the weak radio wave radio station. A calling signal addressed to the weak radio radio station is sent within the service area, and the weak radio radio station that receives the calling signal transmits a calling signal addressed to the radio transmitting station via the transmission path. The received radio transmitting station uses the paging radio waves to select one of the portable radios from which the call is desired and sends out a signal to set up a communication path, and at the same time sends a signal through the transmission path. The weak radio wave radio station also sends out a signal using the weak radio waves, and sends a call standby signal to the portable radio device that wishes to make another call, thereby making a call between the selected portable radio device and the selected portable radio device. A wireless paging communication system configured to form a communication path via the weak radio wave radio station.