JPH03128535A - Line connection switching method - Google Patents

Abstract

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

Description

[Detailed description of the invention] [Description of the field to which the invention pertains] The present invention effectively utilizes fixed wireless stations in a mobile phone system, and provides an inexpensive system that can secure calls without having to install extra fixed wireless stations in advance. It is about building a system that is

[Prior Art and its Problems] NTT's car phone is currently available as a communication method that allows users to make and receive calls while moving anywhere within a certain service or area. NTT also provides mobile phone services using this network.

On the other hand, with the introduction of cordless telephones, the cordless telephone system has been expanded, and it has become possible to realize an in-house mobile phone as a system cordless telephone as shown in Fig. 1. This frequency uses 250/380 MH2, has 89 channels including the control channel, and has a service radius of 50 with a low antenna power of 10 fflW.
It is a small zone system of about 1.0 m. This system is a mobile phone.

Consists of fixed wireless stations and wireless system control equipment. Each element of this configuration will be briefly explained.

*Mobile phone: Has the ability to wirelessly access a wireless control device via a fixed wireless station and automatically register its location. If it is necessary to register the location with another fixed wireless station due to the movement of the mobile phone, it has the function of accessing the wireless system control device and changing the location registration. Call operations can be made from any location within the service area.

*Fixed wireless 8 = Converts downlink signals from a wireless system control device into wireless signals and transmits them to a mobile phone, allowing incoming calls and telephone conversations. On the other hand, by receiving and demodulating uplink wireless signals from the mobile phone and transmitting them via wire to a wireless system control device, outgoing operations and outgoing calls can be performed.

*Wireless control! Il device: Wireless system control device is portable! A fixed wireless station that covers the radio zone where the phone is located;
This is a device that connects the mobile phone and the extension of the local PA device PABX, which has a one-to-one correspondence, when making or receiving a call to form a communication path.

In this way, mobile phone systems have become commonplace, but when a pair of fixed wireless stations and a mobile phone enter a conversation state, they use one wireless line for communication, and the fixed wireless station Since the wireless control channel cannot be received,
Even if other mobile phones try to use the mobile phone in the same zone, they will not receive a response from the fixed wireless station and will be unable to make a call.

In such a case, in order to withstand connection requests from VIPs or emergencies, it is sufficient to install a large number of fixed wireless stations, but there is a problem in that the system cost is high.

Another problem is that when a certain mobile phone connects to fixed wireless station #1 and the mobile phone advances from fixed wireless station #1 to fixed wireless station #2 while talking, when the mobile phone connects to fixed wireless station #1, As the signal from fixed wireless station #1 gradually decreases, the wireless line of fixed wireless station #1 should be disconnected and fixed wireless station #1 should be disconnected.
By connecting to fixed wireless station #2, you can continue talking while moving, but if fixed wireless station #2 is in the middle of a call with another mobile phone, you will not be able to connect, and you will be far away from fixed wireless station #1. As a result, there was a problem that calls were disconnected.

Next, a state in which a mobile phone in this system performs zone switching will be described below.

When a mobile phone and a fixed wireless station are in a communication state, changes occur in the wireless line as the mobile phone moves. For this reason, the fixed wireless 8 and the mobile phone monitor each other's received field strength. Furthermore, control signals are transmitted and received during a call outside the voice band so as not to interfere with the call.

When the received field strength of the connected fixed wireless station drops below a certain value, the mobile phone issues a monitoring request to the fixed wireless station using a control signal outside the voice band. The fixed wireless station that received the signal sends a monitor request command to the wireless system control device via a wired data channel. As a result, the radio system control device issues a command to each fixed radio station, and all fixed radio stations in a standby state monitor the designated communication channel in accordance with the command. After transmitting the monitor request signal, the i-charging machine continuously transmits a zone switching signal using a control signal outside the voice band.

When the fixed wireless station being monitored receives a zone switching signal from the mobile phone, it enters the zone switching state from the standby state. The fixed wireless station that has entered the zone switching response state continuously transmits zone switching response signals on the control channel and waits for a fixed wireless station designation signal from the mobile phone. When the i-charging machine receives this with a receiver other than the voice channel and receives a zone switching response signal from the control channel, it responds to the continuously transmitted zone switching request signal with a control signal outside the voice band of the voice channel. Instead, a fixed wireless station designation signal is continuously transmitted using a control signal outside the voice band of the communication channel. After this, both the fixed wireless station and the mobile phone enter switching processing.

The mobile phone waits for a channel switching completion signal addressed to it from the new fixed wireless station. When a channel switching completion signal is received, a control signal outside the voice band of the currently active call channel replaces the continuously transmitted fixed wireless station designation signal.
Continuously transmits line link request signals. If the new fixed wireless station receives a line link request signal as a control signal outside the voice band from a mobile phone during monitoring, it sends a connection request command to the wireless system control device.

The mobile phone receives an unconfirmed signal from the control channel from the new fixed wireless station to which it is switching, using another receiver that is not used for calls, and receives its own electric field information contained in the signal and the new fixed wireless station. If the line quality of the station is satisfied, the call line is switched from the old fixed wireless station to the new fixed wireless station. After switching the call line, the mobile phone starts continuously transmitting its own terminal confirmation signal using a control signal outside the voice band. When the new fixed wireless station receives a terminal confirmation signal from a mobile phone that is a control signal outside the voice band, it sends a status setting request command to the wireless system control device and also controls the wireless system! A switching completion notification is sent to all fixed wireless stations via the II device.

When the old fixed radio station receives the above notification via the radio system control device, it releases the radio line, sends a disconnection request command to the radio system control device, and returns to the standby state. Further, when other fixed wireless stations receive the above notification, they release the monitoring of the mobile phone.

As mentioned above, it has been found that zone switching is possible, but the premise is that the fixed wireless station to which connection can be switched is available.

In order to maintain the availability of fixed wireless stations, it is sufficient to install a large number of fixed wireless stations, similar to the problem described above, but there is a problem in that the system cost is high.

[Object of the Invention] The present invention provides a mobile phone system in which, when a fixed wireless station to which a mobile phone connects to a wireless line is blocked, the fixed wireless station that is already in use is forcibly passed over, and if necessary, the fixed wireless station that is already in use is switched off. The first goal is to change the connection of a mobile phone to another fixed wireless station, so that the mobile phone that is in the middle of a call will not be disconnected, and will be able to respond to VIPs who are requesting a new connection and make emergency calls. As a second purpose, when the fixed wireless station to which a moving mobile phone connects to the wireless line is blocked, Ming hands over the fixed wireless station that he was using, and By reconnecting a mobile phone that is currently talking to a wireless radio to a vacant fixed wireless station that it was using, it secures the fixed wireless station that it is connecting to, thereby preventing call interruptions and reducing unnecessary calls. The aim is to build an inexpensive system without having to install fixed wireless stations in advance.

[Description of Structure and Effects of the Invention] A first structure of the present invention includes fixed wireless stations constituting a service area that overlaps and covers a plurality of zones; a mobile phone that can communicate with the fixed wireless station; and a mobile phone that connects each of the fixed wireless stations to a general telephone network, and between the mobile phone and at least one fixed wireless station that can communicate with the mobile phone. a wireless system control means for setting and canceling a communication path for the fixed wireless station and for making and receiving calls to the mobile phone via the registered fixed wireless station, the fixed wireless station or the mobile phone; is equipped with a search receiver, which receives radio channels other than those currently used for calls, receives information including IDs of other radio stations and line availability, and and a means for storing the received information in its own storage unit and retransmitting the received IO and line availability information, and the fixed wireless station during the call responds to calls and @call requests from other mobile phones. In order to respond, the wireless system 1iIJ control device determines whether there is another fixed wireless station to which the currently active mobile phone can communicate, and sends the wireless 1iIJ control device to the currently active mobile phone or to the fixed wireless station to which the mobile phone is connectable. This is a line reconnection method characterized by sending commands via the mobile phone and reconnecting the mobile phone in use to another fixed wireless station.The second configuration covers multiple zones with overlap. Each fixed wireless station constituting a service area, a mobile phone existing in the overlap service area and capable of communicating with the fixed wireless station, and each fixed wireless station connected to a general telephone network, A communication path between the mobile phone and at least one fixed wireless station capable of communicating with the telephone and the mobile phone is set up and released, and an R call is sent to the mobile phone via the registered fixed wireless station. In the mobile communication system, the fixed wireless station or the mobile phone is in the process of repeating calls to each other, and a search receiver detects other wireless signals other than the one currently being used for the call. channel and mutually receive information including other mobile phone numbers or other fixed wireless station numbers, and store the received information in its own storage unit;
When a fixed wireless station or mobile phone determines that the field strength of the other party is at a level that makes it impossible to maintain call quality,
Search the information received and accumulated by other receivers that are not used for telephone calls for the time being, search for other fixed wireless stations or mobile N-packers whose electric field strength is above a certain level, and use the search to locate the child. A fixed wireless station number and a mobile phone are sent via the wireless system control device to another fixed wireless station or other mobile phone that is connected to another mobile phone that has been banned or another fixed wireless station, A line connection switching method characterized by transmitting another mobile phone number and another fixed wireless station number of the replacement partner that have been searched and selected, and switching the connection with the fixed wireless station to which the mobile phone is connected. It is.

The present invention will be explained in detail below.

The basic configuration of the present invention is shown in FIG. In FIG. 1, the wireless system control device 10 is connected after the private branch exchange 20, but
If the wireless system control device 10 is provided with a switching function, the present invention can be implemented in the same manner even if the private branch exchange 11t20 is not provided. Further, although the fixed wireless stations are independent from each other, by connecting the fixed wireless stations with each other by wire, it is possible to perform similar, even faster, and more sophisticated processing.

As shown in Figures 2-A and 2-8, the zone configuration, which is the wireless service area, requires that the wireless service areas of each fixed wireless station overlap, although not 100% of each other. be. Furthermore, the mobile phone and the fixed wireless station are configured as shown in FIGS. 5(a) and 5(b).

In other words, the mobile phone (a>
101 and search receiving MN 102, and the transmitter 10
3, control unit 104, transmitter 105, dial button 106,
Handset 107, antenna duplexer 108, antenna 109
It consists of Fixed wireless 8(b) is composed of two receivers, a telephone receiver 201 and a search receiver 202, a transmitter 203, a radio controller 204, a network controller 205, an antenna duplexer 206, and an antenna 207. .

Each search receiver can operate completely independently of the telephone receiver, and operates independently even when the telephone receiver is in operation. If you are prepared for call interruptions, it is possible to use only one receiver. The wireless control channel is only for data transmission, but the wireless voice channel for voice calls is capable of transmitting data of, for example, about 1008 PS, in addition to the voice for voice calls, for both fixed wireless stations and mobile phones. .

Wired systems have data channels in addition to voice,
Even during a call, it is possible to transmit and receive data, for example, between a fixed wireless station and a wireless system control device, or between other fixed wireless stations.

The data channel can be of the type that accompanies digitized voice (for example, 2B+D on the 15DN digital line), or it can be transmitted directly to analog voice even though it interferes with the call.
This can be realized in various ways, such as using the out-of-band analog audio.

A fixed wireless station sends information to mobile phones at all times, except during calls, to register its own station's recognition number and registered mobile phone number on the broadcast channel for location registration. f. NatsumeTelephone number and availability information of fixed wireless stations are transmitted. During a call, a fixed wireless station must transmit its own recognition number, the mobile phone number of the other party, and the mobile phone number registered to the station itself or the mobile phone number that can receive reception at a certain level or higher at the current voice band. It is being sent on an external data channel. Regardless of whether the fixed wireless station is transmitting or receiving, the search receiver receives not only the control channel but also the communication channel and requests the mobile phone to make a call.

The mobile phone receives the ID and the ID of the fixed wireless station that the mobile phone is receiving or has registered, and stores it in the memory. Similarly, regardless of whether the mobile phone is making a call or not, the search receiver uses the fixed wireless station identification number for location registration issued by the fixed wireless station, and the mobile phone number registered with the fixed wireless station. When a fixed wireless station is in the middle of a call, the fixed wireless station number, the mobile phone number of the other party, the mobile phone number registered at the fixed wireless station, and the information received by the fixed wireless station are transmitted on the communication channel. Receiving another mobile phone number.

In addition, during a call, the mobile phone registers the identification number 11 of the own station, the fixed wireless station number of the other party, and the fixed wireless number 8 that can be received at a certain level or higher at the current time received by the search receiver. The fixed wireless station number and its availability information are transmitted on a data channel outside the voice band. FIG. 3 shows the signals received and transmitted by each of these stations.

Hereinafter, the present invention will be specifically explained with reference to FIGS. 2-A and 2-8. In FIG. 2-A, the wireless system control device is omitted. #1 to #m represent fixed wireless stations, and A-N represent mobile phones.

In FIG. 2-A, mobile phone A is currently connected to fixed wireless station #2. Mobile phone A and mobile phone B are fixed wireless station #2
shall be within the same service area. Furthermore, it is assumed that the mobile phone 11A also belongs to the service area of the fixed wireless station #1. 'When the fixed wireless station #2 starts a call with the mobile phone A, it stores the number A of the mobile phone of the other party as data received by the call receiver.

Fixed wireless station #2 is a registered fixed wireless station of mobile phone A that is stored in mobile phone A and emits outside the voice band.
Alternatively, it is possible to receive the fixed wireless station number #1, which mobile phone A can currently receive strongly, and its availability information.

Next, a case will be described in which mobile phone B requests a call within the service area of fixed wireless station #2 in this state. Mobile phone B requests a call, but since fixed wireless station #2, which corresponds to the parent in the same zone, is being used, the call cannot normally be processed.

In the present invention, in this state, fixed wireless station #2 learns that mobile phone B is about to make an R call using the search receiver for purposes other than calls, and fixed wireless station #2 determines that the mobile phone number currently in use is
Mobile phone A checks its own memory to see if there is a registered fixed wireless station other than fixed wireless station #2 and whether the fixed wireless station is available, and if mobile phone A is within the service area of fixed wireless station #1. I know it's there.

In other words, even when mobile phone A is connected to fixed wireless station #2,
A receiver for Zarch other than for calls, and a fixed f for other than the other party! ! N line station #1 receives the notification information sent out from line waste, receives the information that it is in the service area of fixed wireless station #1 and the availability information of the fixed wireless station, stores it in its own memory, and transmits it to the mobile phone eIA. During a call, mobile phone A sends data outside the voice band to the fixed wireless station #2, which is the other party, indicating that mobile phone A is within the service area of fixed wireless station #1. can know that mobile phone A is within the service area of fixed wireless station #1.

Next, fixed wireless station #2 transmits information to fixed wireless station #2 via the wired data channel or voice communication path to the wireless system control device.
At the same time as the connection change command, send the current mobile phone number @A and the local station's fixed wireless station number #2 as data to address 1. Upon receiving this, the wireless system control device puts the wired system of mobile phone A that is currently on call on hold. Fixed wireless station #2 further issues an instruction to connected mobile phone IA to connect to fixed wireless station #1, disconnects the wireless line, and leaves the channel in an empty state.

Fixed wireless station #1 receives the notification from the wireless system control device,
A signal from mobile phone A, which will subsequently request connection, is waited for with priority. Therefore, other connections will not be accepted for a while. Fixed wireless station #2, which had been waiting for a front line connection request from mobile phone B, immediately sets up a wireless line with mobile phone B, and connects fixed wireless station #2 and mobile phone B.
enters the call through the darkness. Similarly, mobile phone A and fixed wireless station #1 are connected. Fixed wireless station #1 informs the wireless II a[l device of this situation, cancels the hold for mobile phone A, and starts a call.

On the other hand, mobile phone 4fflA was making comfortable calls, but mobile phone B was affected and calls were temporarily interrupted. However, since fixed wireless station #1 has been waiting for a priority connection from mobile phone A for a while, after a momentary disconnection, the connection is immediately changed and the call status returns to normal.

As another embodiment of the connection switching described above, when a connection switching command is generated, apart from the above, the wireless system control device first puts the line A on hold. Next, fixed wireless station #2 sends a signal to the wireless system control device to put the route to the line on hold, and fixed wireless station #2 sends a command to mobile phone A to change the connection with fixed wireless station #1. transmit, establish a wireless line between mobile phone A and fixed wireless station #1, and fixed wireless station #1 releases the line hold for the wireless system (II device), and connects mobile phone 4F!A and fixed wireless station #1. 1 may enter into a conversation, and finally, fixed wireless station #2 and mobile phone B may be connected.

In addition, in the above example, the line between mobile phone A and fixed wireless station #2 is opened first, but the order of connection between mobile phone VIA and fixed wireless station #1, and between fixed wireless station #2 and mobile phone B is Not regulated. An example of the connection procedure is shown in FIG. 4-A.

Next, the case of an incoming call will be explained.

In Figure 2-A, when mobile phone IA and fixed wireless station #2 have set up a wireless line and are talking, if there is a message addressed to mobile phone B, which is registered with fixed wireless station #2, the wireless line is 1
Therefore, originally, it would not be possible to call mobile phone B. Here, the fixed wireless station #2 knows that the mobile phone t4A in use is within the service area of a fixed wireless station #1 other than the fixed wireless station #1. 2, the mobile phone A of the other party, and a connection change command are sent to the fixed wireless station #1 via the wireless system control device. The wireless system control device puts the wired system destined for mobile phone A on hold, then sends commands and data to fixed wireless station #1, and prepares to call mobile phone INA from fixed wireless station #1 and set up a line. do.

On the other hand, fixed wireless station #2 sends a signal to the wireless system control device,
After receiving a reply that it was received, the wireless line with mobile phone A is disconnected. Mobile phone A has a fixed focal line 8#1
Enter the first reading. Fixed wireless station #2 now has access to mobile phone A, so it sends an incoming call signal to mobile phone B and establishes a line connection.

In this way, it has been found that it is possible to forcibly release a wireless line that has become cold due to a call, and to respond to a new outgoing or incoming call.

It goes without saying that there is no problem even if the order of the above described steps is different.

Next, the connection change procedure will be explained with reference to FIGS. 2-8.

In Figure 2-8, mobile phone A is connected to fixed wireless station #1,
Mobile phone B is currently connected to fixed wireless station #2.

It is assumed that mobile phone A and mobile phone B are within the service area of both fixed wireless station #2 and fixed wireless station #1.

In this state, the mobile phone IS is connected to the 2nd-8th
It moves toward fixed wireless station #1 on the left side of the figure.

When mobile phone B approaches point A at the boundary of the service area of fixed wireless station #2, the radio waves from fixed wireless station #2 weaken to a level that is barely sufficient to maintain call quality. At this point, mobile phone B enters the zone switching process, but unfortunately, since the identified wireless station #1, which corresponds to the parent of the new zone, is being used, the zone switching process cannot be started. Conventionally, if mobile phone B moves further to the left, the wireless line will be disconnected due to zone overflow. However, in the present invention, fixed wireless station #2 is configured to enter connection switching processing. i.e. fixed wireless station #
2 detects that the radio waves of mobile phone B during a call have weakened, so it is received by another receiver other than the one used for calls, and from the recorded data it detects that the field strength of the mobile phone is above a certain level, or A mobile phone, for example, mobile phone A, whose electric field strength level has increased compared to the previous recording is selected.

Next, fixed wireless station #2 simultaneously sends a connection change command to the wireless system control device via the wired data channel or voice communication path, and connects the mobile phone number @A that it has selected with the same mobile phone A. Possible own fixed wireless station number #2,
Also, the current mobile phone number @B of the other party is sent as data. Upon receiving this, the wireless system control device sends a connection change command to the fixed wireless station #1 included in the sent data via the wired data channel or voice communication path, and at the same time sends a connection change command to the command source fixed wireless station. The number #2, the mobile phone number B1 to which the fixed wireless station #2 is connected, and the mobile phone number @A that is the other party of the fixed wireless station #1 are sent as data. At the same time, the wireless system control device puts the wired system of mobile phone A on hold. Fixed wireless station #1 that received this
disconnects the wireless line of connected mobile phone A, leaving the channel free.

Fixed wireless station #1 prioritizes and waits for signals from mobile phone B that subsequently requests connection, and therefore does not accept any other connections for a while. At the same time as the wireless line of mobile phone A is disconnected, fixed wireless station #1 connects wireless system i via the wired line.
11 devices to inform them that the wireless line has been disconnected. The wireless system control device receives this and transmits it to fixed wireless station #2. At the same time, the wireless system control device puts the wired system of mobile phone B on hold. Fixed wireless station #2 notifies mobile phone B of the connection change command and the connection destination fixed wireless station number #1 through the voice communication path or the data channel of the receiver other than for communication. Mobile phone B immediately disconnects the wireless line and requests wireless connection to fixed wireless station #1 included in the received data. Fixed wireless station #1, which was waiting for a wireless connection request from mobile phone IB, immediately sets up a wireless line and requests the wireless system control device to request mobile phone B.
Make a request to release the hold. Upon receiving this, the wireless system control device releases the hold on the mobile phone 11B, and the fixed wireless station #1 and the mobile phone B enter into an open call.

On the other hand, in order to give priority to the wireless connection request from mobile phone A, fixed wireless station #2 prohibited other calls and was on standby.
It confirms the wireless connection request addressed to itself from mobile phone A, sets up a wireless line, and issues a wired system hold release command to the mobile phone to the wireless system control device. Upon release of this hold, mobile phone A and fixed wireless station #2 enter into an open call.

In this way, by replacing the fixed wireless stations of mobile phone A and mobile phone B, mobile phone B was able to secure calls while proceeding as it was, and was able to achieve the initial goal.

On the other hand, the call to the mobile phone was comfortable, but due to the influence of mobile phone B, the call was briefly interrupted. however,
Due to recent high-temperature processing, all of these cuts can be completed in less than 1 second, so there is no particular problem in practice. If you don't like this decision, you can decide whether to allow or prohibit it depending on the service class.

For example, this can be handled by distributing, for example, prohibiting the mobile phone number of a VIP, and allowing the execution of other numbers. An example of the connection procedure is shown in FIG. 4-B.

In the above case, the fixed wireless station detects the reception level of the mobile phone and starts the connection change by understanding the situation of nearby mobile phones, but in the other embodiments described next, the fixed wireless station The following describes the connection procedure according to a request from.

(1) The mobile phone always listens to other fixed wireless channels for reception other than calls, and mainly uses fixed wireless station numbers sent out of the voice band or on the control channel, such as Mobile W! ! The fixed wireless station #1, which is the fixed wireless station of telephone A, and the level as well as the mobile phone number obtained by the previous fixed wireless station are stored and updated.

(2) Mobile phone B automatically recognizes that the radio waves of fixed wireless station #2 have become weak.

(3) Mobile phone B learns that fixed wireless station #1 is communicating with mobile phone A based on data outside the voice band sent from fixed wireless station #1, and stores it in its memory.

(4) Mobile phone B issues a connection change request to fixed wireless station #2 using a signal outside the voice band.

(5) Mobile phone B sends information from mobile phone B and fixed wireless station #2 to mobile phone A and fixed wireless station #2 to the wireless system control device.
1 data and a connection change command are sent.

(6) The wireless system control device receives this and puts the wired system lines A and B on hold, respectively.

(7) The wireless system control device transmits a connection change command to fixed wireless station #1 as well as data from mobile phone INB and fixed wireless station #2 to mobile phone A and fixed wireless station #1.

(8) Fixed wireless station #1 disconnects the wireless line to the mobile phone, waits for a connection request from the mobile phone BIB, and prohibits calls from others.

(9) Fixed wireless station #1 notifies the wireless system control device of completion of disconnection.

(10) The wireless system υ control device issues a command to disconnect the wireless line between fixed wireless station #1 and mobile phone A, similar to fixed wireless station #2.

(11) Upon receiving this, fixed wireless station #2 disconnects mobile phone B's wireless line. It waits for a connection request from mobile phone A, and prohibits calls from others.

(12) Mobile phone A designates fixed wireless station #2 and requests a wireless line connection. Fixed wireless station #2 after wireless line connection
requests the wireless system control device to release the hold on the wired line.

(13) Mobile phone B designates fixed wireless station #1 and requests a wireless line connection. Fixed wireless station #1 after wireless line connection
requests the wireless system control device to release the hold on wired line B.

(14) The wireless system control device releases the hold on wired lines A and B.

(15) Each person joins the call.

As explained above, it has been found that a connection change request can be made from either a fixed wireless station or a mobile phone.

Furthermore, the present invention can be implemented even if the described procedures are slightly changed.

[Effects of the Invention] As explained above, the present invention has the following effects.

■Previously, if a fixed wireless station was in use, it was impossible for other mobile phones to make a call, but this is now possible. Particularly effective for V (P response) and emergency response.

■In the past, it was necessary to install many extra fixed wireless stations in order for many mobile phones to use them.
Since the present invention does not require this extra fixed wireless station, it is possible to construct a system that can withstand high traffic with an inexpensive system.

■Frontline line users can now use one fixed wireless station for long periods of time with peace of mind, without having to worry about other users by monopolizing it.

■When a connection is changed, the probability of connecting to the previous wireless channel is low, so the result is the same effect as using confidential communication processing against eavesdroppers.

■If the 4J% band phone goes over the zone, the wireless line will be disconnected, but this can be prevented.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an example of a system configuration for implementing the present invention, Figures 2-A and 2-8 are zone constituent countries for explaining the operation of the system of the present invention, and Figure 3 is a diagram of the present invention. Figures 4-A and 4-8 are diagrams showing examples of the format and structure of data that each fixed wireless station receives and transmits when implementing the method of the invention.
The figure shows an example of a flowchart for explaining the operation of the system of the present invention, and FIGS. 5(a) and 5(b) show block diagrams of the mobile phone v1 and fixed wireless station of the present invention. #1 to #m...Fixed wireless stations A to N...Mobile phone, 10...Radio system control device, 20...Private branch exchange, 101. 201... Call receiver,
102.202... Search receiver, 103.
203... Transmitter, 104... Control unit, 105... Transmitter, 106... Dial button, 107...
Handset, 108.206...Antenna sharing problem,
109.207... Antenna, 204...
...Radio control unit, 205...Network control unit.

Claims (2)

[Claims] (1) Each fixed wireless station constituting a service area that overlaps and covers multiple zones, a mobile phone that exists within the overlapping service area and can communicate with the fixed wireless station, and each fixed wireless station. connect the station and the general telephone network, set up and release a communication path between the mobile phone and at least one fixed wireless station that can communicate with the mobile phone, and connect the mobile phone to the registered fixed wireless station. A mobile communication system including a wireless control means for making and receiving calls to and from the mobile phone via a station, wherein the fixed wireless station or the mobile phone is equipped with a search receiver, and the search receiver is configured to Receives a wireless channel other than that used for the call, receives information including the ID of the other wireless station and line availability, stores the received information in its own storage unit, and stores the received information in its own storage unit. and a means for retransmitting the ID and line availability information, and the fixed wireless station that is currently talking is equipped with a means for retransmitting the information on the line availability status, and the fixed wireless station that is currently talking is provided with a means for re-transmitting the information about the line availability status. The presence or absence of a fixed wireless station is determined, and a command is sent via the wireless system control device to the mobile phone in use or to the fixed wireless station to which the mobile phone can connect, and the mobile phone in use is connected to another fixed wireless station. A line connection switching method characterized by switching connections to wireless stations. (2) Each fixed wireless station constituting a service area that overlaps and covers multiple zones, a mobile phone that exists within the overlapping service area and can communicate with the fixed wireless station, and each fixed wireless station. The station and the general telephone network are connected, and a communication path between the mobile phone and at least one fixed wireless station capable of communicating with the mobile phone and the mobile phone is set up and canceled, and the registered fixed wireless A mobile communication system including a wireless control means for making and receiving calls to and from the mobile phone via a mobile station, wherein the fixed wireless station or the mobile phone is in the process of receiving and receiving calls to each other, and the search receiver is currently in the process of calling the mobile phone. By receiving wireless channels other than those used for the mobile phone and mutually receiving information including other mobile phone numbers or other fixed wireless station numbers, the received information is stored in its own storage unit. , when the fixed wireless station or mobile phone determines that the field strength of the other party is at a level that cannot maintain the quality of the call, it searches for the information received and accumulated by a receiver that is not used for calls for the time being, and determines the field strength. Search for other fixed wireless stations or other mobile phones whose strength is above a certain level, and search for other fixed wireless stations or other mobile phones that are connected to the other mobile phones or other fixed wireless stations found through the search. The fixed wireless station number and the mobile phone are sent to the mobile phone via the wireless system control device.
A line connection switching method characterized by transmitting the searched and selected other mobile phone number and other fixed wireless station number of the exchange partner, and switching the connection with the fixed wireless station to which the mobile phone is connected. .