JPS62225033A - Dradio paging communication system - Google Patents

Abstract

PURPOSE:To build inexpensively a communication system capable of communication over a wide range by using the MCA technologic so as to apply simultaneous connection, forming of independent channel with priroity and incorproation/ separation of zones between a base station and plural portable radio equipments in each zone. CONSTITUTION:A base station 8 in a service zone designates a talking channel toward a portable radio equipment by the control of a multi-channel access (MCA) based on an ID of portable radio equipments 9-16. Thus, the simultaneous talking between the radio equipments 9-16 and the base station 8 is attained. A paging management center PC has a management function of a radio line channel and applies incorporation/separation of base stations in each zone. Thus, if a talker moves to other zone during its talking, the channel is switched to the channel in operation in the zone to continue the talking. Further, a function ensuring the priority talking is provided, an identification (ID addition code) relating to the priority is provided to each portable radio equipment, a radio equipment with the lowest priority is cut off forcibly and its idle channel is provided to the radio equipment having the highest priority.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to wireless communication using weak radio waves, which is mainly used at construction sites such as construction and civil engineering work, between a large number of workers or between a work leader and workers. It relates to communication systems.

(Prior art and its problems) In these construction works, it is necessary for many construction workers to jointly carry out dangerous construction work, and during construction, the construction commander may give instructions to the workers, or the construction workers may Communicating between workers is essential for ensuring work safety, and for this reason, wireless paging communication systems have been used.

The outline of this system is shown in Figure 1, which normally uses a portable radio near the site (e.g. 2), but it also uses commands issued by the construction commander who may be located at a radio base station 1, and the actual construction work. Mobile radio a (
For example, communication is performed using 3 to 7).

The basics of the system are simultaneous transmission and reception, and continuous transmission, and the portable radio is used hands-free. A system is made up of multiple slave stations that mainly use portable radios under a master station (wireless base station). If calls are rarely used between the master station and portable radios, it is possible to accommodate a large number of portable radios.
The mobile radios in a group use the same frequency, and when one mobile radio is transmitting, the other mobile radios do not talk and wait for transmission, so that one frequency is shared by multiple stations. ing.

The service area is usually approximately 75 meters in radius from the master station antenna, but if a larger service area is required, use antenna distribution or various repeaters (distributed transceiver, bidirectional booster, etc.) to cover a wide area. A service area can be secured.

In tunnels, buildings, etc., open cables such as leaky coaxial cables and open coaxial cables can be used to obtain the required service area.

In addition, if calls are often used between the master station and the mobile radio, the mobile radios in the group may be able to transmit radio waves at two frequencies, for example, so that one frequency is used by another mobile radio. A method that uses a somewhat high-end portable radio that switches to a different frequency and transmits when there is a radio station is also in use.

However, in all of the above conventional systems shown in Figure 1, the number of channels that can be used for wireless transmission and reception, that is, the frequency of the radio waves that can be transmitted, is limited to one or two waves as described above in the portable radio equipment owned by construction workers. There were very limited numbers. This was done for economical reasons, or to avoid increasing the size of the portable device, since the number of crystal oscillators used in the original oscillator was in one-to-one correspondence with the transmission frequency. This is because the number of crystal oscillators is usually limited to two or less in order to prevent this.

If construction workers are using such systems,
Instructions from a leader who supervises multiple workers can be received by each portable radio, but when a worker wants to respond himself, he must use radio waves when other portable radios are not responding to prevent interference. I needed to find out when the person was not available and respond. Otherwise, if many workers were to use their portable radios at the same time, the transmission frequency would be two channels at most, so even if one or two workers could communicate, it would be more than 3 Å. At that time, there was no channel, which caused interference and made it impossible to communicate smoothly.

Furthermore, when a portable radio has two radio channels, the user must manually switch the channel of the portable radio, such as switching channel 1 to channel 2, which is inconvenient for construction work. There was also a problem in terms of safety.

In addition, due to the high frequency of use between the master station and portable radio equipment (and due to the necessity of construction safety, workers are required to listen to the conductor's instructions at all times, and other workers are required to communicate with the conductor). There may be cases where it is required to monitor the content of the call and use it as a reference for the person's work, and to allow individual workers to communicate with the conductor or other workers whenever necessary.In this case, the system configuration It was unavoidable that the method would be complicated and economically expensive as follows.

In other words, in order to prevent interference, each construction worker should carry a portable radio device with a different transmission frequency (that is, a different type of portable radio device), and communicate using the frequency allocation shown in Figure 2 (a). need to be done. In this case, in order to vary the frequency of radio waves transmitted from the portable radio, a different type of crystal oscillator is installed inside the portable radio, and circuit constants and
Since the adjustment methods are different from others, there are many factors that lead to an increase in prices, such as complicated parts arrangement, complicated design drawings, and uneven adjustment methods when manufacturing portable radios.

In addition to the economically disadvantageous situation described above, Figure 2 (a)
The system shown in 2013 had an essential drawback of being vulnerable to radio interference from other systems.

That is, since the number of radio wave frequencies used is large (total of 5 waves in FIG. 2(a)), it is easily understood that this system is vulnerable to interference from other systems. For example, in the example shown in FIG. 1, the frequency of radio waves in use is 2 waves, whereas in the example shown in FIG. Furthermore, as is clear from Figure 2 (a), if radio wave interference (interference) occurs in any one of the five waves f1 to f4, it will have a negative impact on all the construction workers, and if Fl is interfered with, All construction workers except the conductor suffered from interference and were unable to communicate.

As a measure to reduce this interference to some extent, a method is to provide the base station with a spare frequency F2, and each of the mobile radios 9 to 12 with a spare frequency g+-------g-i. However, as mentioned above, it has not been possible to provide a larger number of reserve channels due to economical reasons or the size of the portable wireless device. Additionally, even with such measures in place, it is cumbersome for construction workers to stop work, discover which wireless channel is experiencing radio interference, and then manually switch to a backup channel. Therefore, it was practically impossible to avoid interference.

Furthermore, the number of construction workers has increased, and they are spread out over a wide area, making it necessary for each group to share the work of each unit while working together as a whole to carry out work for the same purpose at the same time. In some cases, acceptable wireless paging has not yet been implemented.

(Objective of the Invention) The present invention provides an independent system for each mobile radio device in each service zone, even when a large number of portable radio devices are separated into desired numbers within a plurality of service zones. The present invention provides a wireless paging communication system that can form a communication path, perform communication without interference with other communication paths, and also support integration or division recovery of each zone.

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

FIG. 2(b) is a layout diagram showing the basic configuration of wireless paging in one service area used in the system of the present invention.

In Figure 2(b), 8 is a radio base station where a conductor is stationed, and 9
16 are portable radios owned by each construction worker.

These portable radios have been developed recently and are widely used in various radio systems, especially mobile radio systems.
Channel access (hereinafter referred to as rMcAJ) technology is used. This MCA technology makes it possible to set a large number of transmittable channels (therefore, the number of transmission frequencies) of a portable wireless device, and technically it is in practical use up to about 1000 channels. Therefore, whereas conventional devices had one or two crystals to determine the transmission frequency, 100
It has the same function as one with 0 pieces, and there is no need to manufacture different types of portable radios with different transmission frequencies as in the past, but manufacturing the same type of portable radios is sufficient to achieve the purpose. I can do it.

Now, if we apply this MCA technology to portable radio devices and assume that each portable radio device can use 100 wireless channels, a large number of construction workers (second Simultaneous calls can be made from the figure (eight people in the example in BL) to the conductor at the base station. A control channel of frequency fcZ (hereinafter referred to as uplink control channel) is used to transmit control signals to be described later from portable radios 9 to 16 to base station 8 using fcI control channel (hereinafter abbreviated as downlink control channel). ), and the signal transmission of each portable radio device 9 to 16 is configured to be time-divisionally distinguished from each other as shown in FIG. 4. Here, ST is a start point that distinguishes each frame. signal, and each frame contains a portable radio 9.10
．． 11.・-m---・, each time slot T9 of 16
+ Tl1ll T11+""-"-'+TI6 and T+
+m+ Tl oa+TIIm+・−・−−−−−'l
T I 6 & are sequentially assigned as shown. Examples of control channels include calling signals from portable radios, and channel designation signals from base stations.

For example, subcarrier MSK modulation method (mark frequency is 1.
20<1112. Space frequency is 1,800Hz)
The data is transmitted at a transmission rate of 1.200 bit/s.

The base station 8 in FIGS. 3(a) and 3(b) shows an embodiment of the wireless paging method in one service area used in the present invention.
Control channel controller C0NT and transmitter TA provided in
X and the receiver RaX are connected to these downlink control channels (fc
I) and the uplink control channel (fcz), and the hybrid circuit 11. and antenna AT form a control channel transmission path for each portable radio device 9-16. At the base station, the control channel controller C0N
T monitors the usage status of call channels, and if there is an empty channel for a call, it specifies that channel.

The operation in this case will be explained below.

First, it is assumed that the base station is in operation. When workers arrive at the construction site, they each use their own portable radio device 9-1.
6. Turn on the power. As a result, a calling signal is sent to the base station via the uplink control channel fc2. When the base station detects a calling signal, it sends an ID signal sending command to all portable wireless devices. In this case, the portable radio device that receives the control channel sent from the base station receives an ID signal given to the portable radio device (here, ID is a phone number or bank passbook number, etc.) that is unique to other people. (This is a different number unique to the individual) to the base station, and the construction worker using the portable radio is at the work site and is ready to make a call at any time if the base station specifies a call channel. Notify. In contrast, at the base station, the I
It decodes the D signal and specifies the communication channel for the corresponding portable radio device.

On the other hand, the mobile radios a9 to a16 are in a state where they can receive downlink control signals from these base stations.

For example, when the portable radio device 9 receives a communication channel designation signal given to itself among the downlink control signals, the control circuit of the receiving section selects the communication channel assigned to it (in terms of frequency, it is different from the control channel). A channel switching completion signal indicating that the channel has been switched to the base station is transmitted to the base station on the uplink control channel by operating the transmitter of the own portable wireless device only during the time slot allowed to the user.

If other portable radio devices 10 to 16 perform a call operation by turning on the power, mutual transmission of control signals similar to that of the portable radio device 9 described above can be carried out through the uplink control channel of the own portable radio device (transmission frequency "c2"). ), the base station downlink control channel (transmission frequency fc+) is used, and all portable wireless devices are ready to talk on the communication channel designated by the base station.

After the call ends, if you turn off the power on the mobile radio in question,
A call termination signal is sent to the base station, and the base station also sets the call channel of the mobile radio to "end call" and waits for the next call operation.

FIG. 5 is a flowchart of the operations between the base station and the portable radio device described above, and these operations are performed in parallel and independently for each portable radio device.

FIG. 2(b) shows the communication channel allocation arrangement in this situation. That is, the portable radio 9 receives the frequency F1 of the base station communication channel, and receives the frequency f of the communication channel 1.
1, the same 10 receives the frequency F of the base station communication channel, and itself receives the frequency f2 of the communication channel 2.
The mobile radio 11 can receive the frequency F1 of the base station communication channel, and can itself transmit the frequency f3 of the communication channel 3. In the same manner, the mobile radio 16 receives the frequency F1 of the base station communication channel. It can receive F1 and transmit the frequency fa of communication channel 8 itself. Now, in the wireless paging communication system in the state shown in Figure 2 (bl), each owner of a portable radio device can talk to the construction commander at the base station whenever necessary without interference from others. be able to.

Figure 3 (Ml shows an example of the configuration of a wireless base station in one service area, and the mobile wireless devices 9 to 16 on the right
Since different communication channels (therefore, different wave numbers) are assigned to the communication channels in , it is clear that communication with the base station can be performed without mutual radio wave interference. Now,
At the base station, the received radio waves coming from the transmitting and receiving antennas are sent to receivers RX9+'-'+RX, each having a bandpass filter.
input to Ilk.

Here, the portable radio device 9 is connected to the receiver Rx9, and the same IO is connected to the receiver Rx9.

RX16 corresponds to RXl&. The demodulated outputs (audio outputs) of these receivers are mixed by an audio mixing circuit VMIX, and become a monitor speaker SP output to the conductor at the base station. Further, the conductor himself can transmit instructions via the microphone MrC through the transmitters T. Hybrid circuit H1 and antenna A
T is shared by the control channel and voice transmission.

Since 100 wireless channels can be used with this portable radio, if the radio wave interference countermeasures described below are not required, technically 100 construction workers each own a portable radio and the base station conductor This shows that it is possible to communicate with

Next, due to the high frequency of use between radio base stations and portable radios, and due to the necessity of construction safety, workers are required to constantly listen to the instructions of the conductor, and other workers are required to conduct the conductor's instructions. The first step is to develop a system configuration when it is required to monitor the contents of calls with employees and use them as reference for their work, and to enable calls between three or more parties involving individual workers at any time when necessary. This is shown in Figure 3 (b). The difference between this figure and Figure 3 (al) is in the output of the audio mixing circuit VMIX in the receiving section of the base station.
A part of the output is added to the output of the base station monitor speaker SP, and the other part is mixed with the output of the base station worker's microphone old C by the hybrid circuit 11□, and is added to the transmitter TX, and is sent to each portable radio. sent to. By receiving the radio waves transmitted by the base station, each portable radio device can listen in on calls not only from the conductor but also from other construction workers. Technically speaking, it can be seen that in this example, a maximum of 101 people can talk at the same time.

In addition, if the base station configuration in Figure 3 (bl) is used, the construction leader does not necessarily need to be at the base station, and the base station may be staffed only by a monitor or unmanned, and can be used at a construction site where other construction workers are present. It is clear from this diagram that even if you are nearby and take direct command, it is possible to carry out exactly the same communication as described above.

Now, we will explain countermeasures when radio wave interference, which has been a difficult problem to solve in conventional systems, occurs in the system shown in FIG. 3 (Ml or (bl).

As an example, if an interference radio wave frequency close to the transmission frequency f of the portable radio device 9 occurs, the contents of the call by the owner of the portable radio device 9 will not be received by the construction leader 8. This condition is found in the interference detector DT in the radio base station block diagram of FIG.

. . -+f11, and has a function of switching reception and detecting the presence or absence of interference, and is a known device. Now, when this interference detector DT detects that the frequency is being interfered with, this information is transmitted to the control channel control unit C0NT of the base station, and the CPU in the control channel control unit C0NT is operated to When there is interference in the communication channel f1 of the portable radio device 9, the downlink control channel time slot T9 to the portable radio device 9 instructs the portable radio device 9 to switch the carrier frequency of the communication signal from f to gI. do. At the same time, the receiving frequency of the base station receiver RX9 is changed from ft to gI, and the receiving state is changed to the receiving state.

The above explanation is based on the case where interference radio waves close to the transmission frequency f of the portable radio device 9 occur, but the explanation is exactly the same when interference occurs with other portable radio devices or multiple portable radio devices, etc. .

Next, when radio wave interference occurs near the transmission frequency F of the radio base station, it is detected by the interference detector DT, and the control channel control unit C0NT sends a base station transmission frequency change command signal to the base station transmitter TIX. and the transmission frequency is Fl.
to F2. At the same time, the reception frequency is changed from Fl to F2 for each portable radio through the downlink control channel.
A reception frequency change command signal is sent to change the reception frequency to .

Each portable wireless device that receives this control signal changes its reception frequency from Fl to F2. Thus, each call can continue using the new frequency without interference.

Note that the above-mentioned control signal may be transmitted by temporarily cutting off the call signal and transmitting it during that time, or by using an upper or lower side band of the voice signal band and transmitting it without affecting the voice signal in any way.

As described above, when it is necessary to provide a backup channel to prevent interference, it is necessary to reduce the number of simultaneous callers. In other words, if there is one wave of radio wave interference on the mobile device channel, the number of simultaneous callers will be 99 people, if there are two waves, the number of people talking at the same time will be 98 people, and generally when n waves occur, the number of people talking at the same time will be (100-n).
We have to reduce the number of people. However, as explained above, the rate of decrease is not large and can be almost ignored. It is clear that this effect would be further reduced if MCA technology were used to allow portable radios access to a larger number of radio channels.

Finally, one example of the interference detector DT used in the embodiment of FIG. 3 (al or (b)) will be explained. First,
At the stage when a communication path is established between the base station and the mobile radio, this receiver detects interference waves by unmodulating the desired signal (S) and detecting interference from noise (N) that falls within the voice band. A method is adopted in which the level (N+I) of the noise (1) is determined and it is confirmed from this whether the required S/N + 1 is satisfied. The principle of detecting interference during a call is as shown in FIG.

In other words, the desired wave (D wave) interference wave (
The presence or absence of interference is determined by performing ΔM detection on the beat component of the U wave and determining its level.

The function of the paging management center, which is one of the main features of the present invention, will be explained.

First, one of its functions is the management of wireless line channels. For example, assume that a maximum of 8 channels can be used in each of service areas A, B, and C of the wireless paging system in FIG. Suppose it is possible. 100 as a switchable frequency for portable radios
However, the number of radio channels installed in a radio base station is limited to the number necessary for simultaneous communication in consideration of the construction work for economic efficiency.

That is, as shown in FIG. 7, in wireless zone A, a total of 10 channels, 8 working channels and 2 backup channels, is the maximum number of communicable channels. At the paging management center, the radio frequency channel number of each of these 26 channels, the number of the radio zone to which it belongs (A, B, C in Fig. 7),
Information essential for call connection processing, such as line numbers for each wireless zone, must be stored and updated sequentially.

When a call is connected, or when a mobile wireless caller moves from one wireless zone to another during a call, the previously used wireless channel is switched to the wireless channel of the new zone (the active channel Regarding the operation of communication circuits, such as switching operations, it is possible to identify whether each line is in use or not, or whether it is usable or unusable due to line blockage, and to ensure that all lines are used equally. It has the function to select as follows.

FIG. 8 shows a configuration diagram of the paging management center.

Another function of the paging management center (hereinafter abbreviated as PC) is to determine call quality in each wireless zone. This function will be specifically explained below.

There are various levels of call quality required for construction using paging systems. In other words, construction workers whose work is precise and require high call quality with high clarity, or who do not require high call quality but rather require as wide a wireless zone as possible. Various service formats can be considered, such as when the service is spread out over a wide area. PCs have the following functions to support these requirements.

i) Determination of the minimum received electric field level of each wireless zone, that is, determination of the size of the wireless zone where communication is possible; It goes without saying that the maximum power value stipulated by the Radio Law, etc. must be satisfied.) The above i) can be achieved by adjusting the squelch level of the base station receiver and the portable device receiver. Regarding ii), it is technically possible to control both the base station and the transmitter of the mobile radio to an arbitrary value using a control signal.

Furthermore, as a PC, it has a communication traffic regulation function in each wireless zone. As a specific function, it handles the occurrence of emergencies and the increase in the number of simultaneous callers beyond the rating, and secures communication using the following methods.

First, there is the use of backup receivers installed at base stations. At the radio base station A in FIG. 9 or 10.

In this case, since two backup receivers RXll+ and Rxm□ are installed, the number of simultaneous callers is 10 channels in total, including the rated 8 channels and 2 backup channels. The PC can assign transmission channels f and f17+ to the portable wireless devices 17 and 18, respectively, using a control signal to allow them to participate in a call. At the same time, calls and communication restrictions are placed on surrounding wireless zones B and C as necessary. This means that if the transmitting power increases in wireless zone A, the minimum received electric field level will be set low, and if zone 8 is substantially thicker, it will overlap considerably with zone B or C, causing radio wave interference. This is extremely effective when there is a risk of occurrence of a call.Therefore, in this case, although the maximum number of simultaneous callers (mobile devices) is 8 in Zone B and Zone C, it is necessary to limit the number to 8 Å or less, or The role of the PC is to reduce transmission power so that communication in zone A can be performed smoothly.

Another important function of the PC is to secure priority calls to the construction general conductor, deputy general conductor, etc. That is,
Wireless zone A, as described below.

When a construction commander who oversees all the construction work being carried out in B and C patrols zones A, B, and C of the construction site, it is assumed that all channels are in use at the construction site. In other words, in zones A, B, and C, if a simultaneous caller (on the mobile phone side) is using all 8 channels, in zone A, if the construction general manager wants to participate in the call, the PC will use the backup channel (backup receiver). ), but since there are no spares in Zones B and C, the construction supervisor will not be able to participate in the call if this continues. In order to solve this problem, we set up priority discrimination for the mobile radios owned by construction workers, and forcibly disconnected the workers with the lowest priority from their PCs even if they were on the phone. Give vacant channels to the construction supervisor with the highest priority.

As a specific example of assigning priority, I
For the general conductor (000
00), for the general conductor (00001], for each conductor (
ID addition codes such as 00010) (00011) should be given, and (11111) should be given to construction workers with the lowest priority, and methods such as giving lower binary numbers higher priority should be adopted. I can do it.

By giving an ID addendum code such as the one below, even when two or more high priority parties interrupt and join a call in a radio zone in which all rated channels are in use, low priority mobile radio This can be easily achieved by forcibly cutting the machine as much as necessary.

Further, by using identification information indicating this priority, the function of the simultaneous command can be expanded. That is, for example, when a predetermined simultaneous command request is made after the identification information is sent from a certain portable radio device to the base station, the paging management center P
At C, the priority of the identification information sent immediately before this simultaneous command request is determined, and a predetermined priority is determined (for example, in the above example, the general commander of (00001) or [00010]
(each conductor) or higher, the call path for all active portable radios in all zones or at least one zone corresponding to the priority is forcibly interrupted and a simultaneous command request is issued. This portable radio device can issue simultaneous commands to other portable radio devices.

In addition to the general functions, the PC has a location registration function ring that registers the current location of each mobile radio and allows individual control signals and call signals to be transmitted whenever necessary. are doing.

Now, a certain portable radio turned on for the first time and P
Suppose that C is asked to participate in communication.

As shown in FIG. 7, since there are multiple wireless zones, the paging management center needs to detect which wireless zone the portable wireless device is in. Therefore, the radio waves of the uplink control channel are received by the wireless base station installed at the center of each wireless zone, and the strength of these signals is collected by the paging management center PC, and the power of the base station that obtained the highest signal level is covered. It is determined that the portable radio device is located in the zone. Therefore, when the paging management center PC uses a downlink control channel to specify a call channel to be assigned to the portable radio, it identifies from which radio zone the portable radio transmits the signal,
It is necessary to allocate a corresponding telephone line. Channel switching during a call also has a function to identify which wireless zone the mobile device has moved to.

9 and 10 show the equipment configurations of the paging management center and wireless base stations A, B, and C.

FIG. 11 shows details of the speech channel (uplink) control section of FIG. 10. That is, it shows the call status of the wireless paging system at a certain time. In Figure 11, there are 8 channels in wireless zone A, 8 channels in wireless zone B, and 8 channels in wireless zone C.
Each channel is in use, and these channels are managed by the paging management center. The figure also shows the audio mixing circuit. Each switch SJ, SW
In z and SW+, blacked-out intersections indicate that intersecting lines are connected.

In addition, assuming that simultaneous calls over 10 Å are required in Zone A due to construction or other circumstances, preliminary reception aRXml+ R
By providing 11I12 etc., it is possible to increase the number of simultaneous callers to 10.

FIG. 12 shows a call-making operation flow when the portable radio device 8 is powered on in zone A of FIG. 7.

FIG. 13 shows the operation of channel switching during a call in order to continue the call (with the management center) when the worker who owns the portable radio device 9 in FIG. 7 moves from zone A to zone B during a call. Show flow.

However, the illustration shows a case where one mobile radio comes from zone A while the maximum rating of 7 channels is being used in wireless zone B, compared to the maximum rating of 8 channels due to the vehicle in front.

In implementing the system of the present invention, a microprocessor or the like may be used to implement control in software, thereby realizing various functions necessary for multi-channel access.

The present invention is based on the wireless paging communication method described above, and enables the integration of multiple service zones or the division and restoration of the original service zone. Figure 14 shows the multiple service areas used in the method of the present invention. FIG. 2 is a layout diagram showing the basic configuration of wireless paging. 1st
In FIG. 4, it is assumed that radio base stations A to C are configured independently from each other with zones within circles around them serving as service zones. At this time, service zones A and B will be integrated due to the progress of the construction work or the convenience of construction supervision, etc., and as shown in Figure 15, 10 construction workers 9 to 18 of A and 19 to 26 of B If you want to integrate 8 people (other than 19.26 are omitted) into the same service area, this provides a means to technically realize this. The following description will be made using the zone (A, B) integrated operation flowchart of FIG. 17.

First, assume that construction workers working in zone A want to integrate construction workers working in zone B. At this point, each zone is making calls (in zone A, F, ~ fl + "2.-...
・f,, In the B zone, 'I-gl + g t
+・−・・−・8. ) is in progress. Further, the description will be made assuming that each portable radio device is provided with a dial section (1, 2, to -9, 0 and function buttons #, *).

Conductor A dials function button #12 (number for requesting integration of wireless zone B into his own zone). Since this control signal is transmitted superimposed with voice in the lower or upper frequency band of the voice frequency band, calls in the A zone can be carried out without any interference. This signal is detected by the paging management center PC, and an ID signal sending command is issued to A for 1i1i recognition. A receives this and transmits the ID. This is li! on the paging management center PC. If the zone integration request from A is accepted, the commander B of zone B makes a decision as to whether or not to accept the zone integration request from A. This is done by issuing a special ringing or display as a zone integration request control signal from the paging management center PC to conductor B's portable radio, so that there is no interference with calls in zone B. The signal is also sent in a frequency band above or below the audio signal.

When B responds to zone integration, when function button # is turned on, a control signal indicating that zone integration is permitted is sent to the paging management center PC.6 The paging management center PC receives this and commands the A zone. A control signal indicating that zone integration is permitted is sent to person A, and A also sends a control signal to person A to the switch group.

Transmit B zone integrated signal. As a result, the integrated switch 5WAIl of the switch group shown in FIG. 16 is turned on, and calls between A and B are integrated. In addition,
As shown in Figure 16 (al), mix the outputs of each receiver of the B base station with the SW in Figure 16 (bl), mix these again with the microphones of each base station, and add them to the transmitter. For example, there is no need for a construction supervisor to be stationed at the paging management center PC or each wireless base station, and the construction supervisor can take command at the construction site together with the construction workers.

Next, if it is desired to cancel the zone integration and return to the original state, the conductor of A or B can press the function button, for example *12, to cancel it according to the same flowchart as in FIG. 17.

(Effects of the Invention) By using the present invention as a substitute for the conventional wireless paging system, it is possible to continue the call even if the user crosses the wireless zone and moves to another zone during the call, which was previously impossible. In addition, it becomes possible to use a system with a high degree of effective frequency utilization. Furthermore, the number of construction workers has increased, and they are spread out over a wide area, making it necessary for each group to share the work of each unit while working together as a whole to carry out work for the same purpose at the same time. Even in such a case, it is possible to continue the necessary individual or group calls by setting a desired call priority as appropriate, and it is also possible to integrate or divide and restore service zones. Therefore, it is clear that it can make a significant contribution to improving the efficiency and safety of construction work.

In addition, compared to manufacturing many types of portable wireless devices with different transmission frequencies as in the past, the present invention allows MCA
The ability to easily configure a system by manufacturing the same type of portable radio using technology has great effects in terms of mass production effects, such as reducing the number of man-hours and the types of parts used.

[Brief explanation of drawings]

1 and 2(a) are layout diagrams showing an example of a conventional wireless paging system, FIG. 2Tb) is a layout diagram showing an example of a wireless paging system used in the present invention, and FIG.
1(b) is a block diagram showing an example of the configuration of a wireless base station used in the present invention; FIG. 4 is a time chart showing an example of transmission of control signals between the wireless base station and a portable M4 device in the present invention
FIG. 5 is a flowchart for explaining the basic operation of the system of the present invention, FIG. 6 is a waveform diagram for explaining the principle of interference detection used in the present invention, and FIG. 7 is a diagram of the service area of the present invention. FIG. 8 is a block diagram showing a configuration example of a paging management center used in the present invention, and FIGS. 9 and 10 are schematic diagrams for explaining the configuration of a paging management center and a wireless base station used in the present invention. FIG. 11 is a connection diagram showing details of the communication channel (uplink) control section of FIG. 10, FIGS. 12 and 13 are flowcharts for explaining the present invention in detail, and FIGS. FIG. 15 is a service area schematic diagram explaining the present invention in detail, FIG. 16 (al is a block diagram showing the main part of the configuration example of the present invention, and FIG. 16(b) is the same as the embodiment of FIG. 16(a). A connection diagram showing one example of the switch used, and FIG. 17 are a flowchart for explaining the present invention in detail. 1... Wireless base station, 2.3.4.5.6.7...
Mobile radio JR18...multi-channel access radio base station, 9.10.11.12.13.14.15
．． 16...Portable radio, PC...Baging management center. Voice 2 [Spear 3 flash (0) 〒3 rooster (BL Voice 40 Door 6 Kuni voice 5 Figure PC 78 Figure each part' Abusive language 7hA, ff1lo flash L J Voice 11 Figure, 1120 to -;'>7゛'''r'crit'sir+PCI
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Claims (1)

[Claims] A large number of portable wireless devices are placed separately in desired numbers within multiple service zones, and a multi-channel wireless device is installed.
Using access technology, the mobile radio in each service zone is arranged so that it can connect simultaneously to the wireless base station of the service zone, and the plurality of service zones are arranged so that zones can be integrated in any combination. consists of
Under the control of the multi-channel access technology in each of the radio base stations, independent calls are made between at least two of the plurality of portable radios in a predetermined priority order unique to the plurality of portable radios. A wireless paging communication system configured to form a communication channel.