JPH0771330B2 - Mobile communication system - Google Patents

Description

Description: (1) Technical Field to which the Invention belongs The present invention relates to mobile communication using a small zone configuration, in which an incoming / outgoing call with a mobile terminal is always secured from any location within a service area and communication is in progress. The present invention relates to a communication method and system for satisfying the communication quality when the communication quality deteriorates due to the movement of the mobile terminal. More specifically, the present invention relates to a communication method and system that are excellent in effective frequency utilization rate, communication quality, and wireless line control capability.

(2) Conventional technology and its problems Generally, when mobile communication is performed in a wide service area, one radio base station covers the entire area and communicates with mobiles in the service area. Is called the large zone method. On the other hand, the small zone method means that the service area is divided into a plurality of small areas, one radio base station is installed in each of the divided areas, and a mobile radio device in each area. Communicates with these radio base stations.

The conventional small zone method is, for example, NT which is currently in commercial service.
It is used in T's car telephone system [Reference Yoshikawa et al. "Car phone radio line control" Nippon Telegraph and Telephone Telecommunications Research Laboratories Research Practical Report Vol.26, No.7, page 1885].

First, as a method of processing an incoming call to a mobile station that moves anywhere in the service area, a method of calling all at once in a mobile station location area that is known in advance is used.

Location registration is performed by notifying the mobile telephone exchange of the location of the mobile device. A signal relating to position information for position registration is transmitted to the incoming call control channel on which the mobile station waits, and this signal is made different for each paging area. When the mobile device detects that the position information signal has changed, the position registration is performed by automatically transmitting the position registration signal.

The next time the mobile station makes a call, it uses the outgoing control channel available in the control zone in which the mobile station is located. In this case, since the number of the outgoing call control channel is constantly notified by the incoming call control channel, the mobile device stores this number and uses the empty channel (empty line control method) among them. On the base station side, as described above, the radio waves from the mobile device are received by multiple radio base stations, and as a result, the radio zone in which the mobile device is located is identified (position detection), and an empty call channel that can be used in that radio zone. By specifying, the call can be made.

Further, the incoming call will be described. The mobile station is listening on the incoming control channel. When the mobile unit moves to another control zone, it is necessary to switch to the incoming control channel used in the new control zone. Therefore, if the reception level of the incoming control channel drops below the required value,
There is a function to selectively capture channels that are received above the required level from the multiple channels assigned for incoming control.
The mobile device identifies the control zone.

Therefore, when an incoming call arrives at a mobile unit consisting of a fixed telephone network, it is desirable if the mobile telephone switching center makes a simultaneous call from all the radio base stations in the control zone (s) where the location is registered. Will be called.

The above is an outline of a practical system, but if the system as described below is constructed, various problems will occur.

In order to increase the number of subscribers (the number of mobile phones) accommodated in the system by one digit or more from the conventional system to 100,000 to several million, the zone radius must be reduced by one digit or more. In this case, if the wireless line control is centrally managed as described above, ultra-high-speed control is not possible due to congestion of control traffic due to the generation of many control signals and the absolute delay time that occurs in signal transmission from the wireless base station to the wireless line control station. Becomes

Make it usable not only inside the car but also outside the car by people. This is the first step to realize the ultimate telephone system, "anytime, anywhere, anywhere", but for this purpose it is necessary to downsize the mobile radio.

To improve usability, for example, it is necessary to lengthen the battery charging cycle. Therefore, the rate of the wireless transmitter output (5wat
From t to about 10mW), it is necessary to reduce power consumption.

It is necessary to maximize the utilization efficiency of the used frequency.
This is a major prerequisite for realizing a system capable of accommodating a large number of millions of subscribers.

As one system proposal (trial plan) satisfying such requirements, the present inventors have already proposed [Reference. Ito "Study on Cellular Phone System-Focusing on Wireless Network Control and Routing-" IEICE Technical Report CS87-16
May 1987].

According to this proposal, the following conditions are provided.

The number of subscribers accommodated in the system can cover all the people of Japan.

It can be realized in a size that can be carried by a person.

It is as compact and lightweight as a cordless phone. However, the transmission power is about 10 mw.

Assuming a radius of about 25 m as the size of the wireless zone, a required frequency band of 2 to 3 MHz is sufficient.

Decentralize the system control such that each mobile phone takes the initiative. The wireless transmission / reception capability of the mobile phone master device is 1
A set of transceivers or one radio channel is sufficient.

In addition to having multi-channel access capability, the transmitter / receiver in section has a wireless line control capability, that is, control channel use capability and a wireless line communication capability, that is, call channel use capability.

Further, regarding the location registration of the mobile phone, which is a problem in the system adopting the minimum zone method with the radius of 25 m as described above, it is proposed in the following document.

[Reference Ito "Study on mobile phone system-Proposal of multiple location registration and application to system operation-Technical report of IEICE RCS88 September 1988"] Using this proposal, the following problems can be solved. is what happened.

In a small zone system that uses small and small zones (micro cells) with a radius of 25 to 100 m, the service area per wireless base station is extremely narrow, and the distance between the transmitting antenna and the receiving antenna is short, so it follows the short-range radio wave propagation characteristics. It becomes a region and has a complex appearance due to the influence of topography and features. In a service area in this state,
When location registration is performed from a mobile unit, a large number of radio base stations can receive signals from mobile radios, making it difficult to determine in which area they are located. I decided to register the location of the base station.
As a result, making and receiving calls became easier.

The use of control signals for location registration is reduced and radio interference is reduced.

Effective use of frequencies (radio waves) is achieved.

It is easy to take countermeasures against call congestion, and call loss is reduced.

Transmit and receive diversity can be easily applied,
It is possible to use it for improving the call quality.

Although the above advantages have been clarified, no concrete system proposal has been made yet.

(3) Object of the Invention An object of the present invention is to build a system having a high frequency utilization rate, capable of accommodating large capacity subscribers, and high serviceability as a mobile communication system using a microcell based on the above conventional technology. It is to provide a mobile communication system capable of doing the above.

In order to achieve this object, the mobile communication system according to the present invention is provided with a plurality of zones which are arranged so as to respectively cover corresponding zones of a plurality of zones and constitute a service area, and which send out unique broadcast signals. A fixed wireless station, a plurality of mobile phones located in the service area and capable of communicating with any of the plurality of fixed wireless stations, and for connecting the plurality of fixed wireless stations and a general telephone network A mobile communication system including a wireless control device provided, wherein each of the plurality of mobile phones has a SID registration table for recording the status of position registration, and performs position registration with the fixed wireless station. A location registration request signal for updating the location registration status for at least one of the plurality of fixed wireless stations in the SID registration table. Each of the plurality of fixed wireless stations has a PID registration table, and responds to the location registration request signal from each of the plurality of mobile phones, the fixed wireless of each mobile phone. The status of location registration in the service zone of the station
The registration table has a function of updating and updating at any time, and in the wired section between the plurality of fixed wireless stations and the wireless system control device, the plurality of fixed wireless stations are the main and the wireless system control device is the subordinate. The line setting is performed by referring to the registration status of the PID registration table in the relationship, and the plurality of mobile phones are mainly used in the wireless section between the plurality of fixed wireless stations and the plurality of mobile phones. Since the wireless station has a subordinate relationship, the line is set by referring to the registration status of the SID registration table.

(4) Description of the structure and operation of the invention FIG. 1 shows the invention in a large-scale high-rise building B3 (3rd basement floor) to 21F.
This is an embodiment when applied to a system having a service area within (21 floors above ground).

In the figure, a switching device PBX has an interface function with a public line CO and a radio controller which is a main component of the system of the present invention.

The system of the present invention is a wireless control device (wireless control device RC
E), fixed wireless station (fixed wireless station FRS) and mobile phone (mobile phone PTEL), which realizes a service that can be called from anywhere in the service area, anytime, anywhere.

However, the above-mentioned service contents are between mobile phones PTEL,
It can be performed between the mobile telephone PTEL and the fixed telephone PTEL in the building, and also between the mobile telephone and the telephone installed on the outside line (far from the private branch exchange).

Although the features of the present invention are as described above, the terminal, not the center of the wireless control device, as in the conventional system, has the center of the judgment such as the position registration of the mobile phone and the operation of making and receiving calls. As a result, the load on the wireless control device in the center is lightened, the work speed is increased, and
As a result, it is possible to easily cope with the addition of terminals and the expansion of the system. Hereinafter, each component used in the configuration of the present invention shown in FIG. 1 will be described in detail.

(I) Mobile phone (PTEL) This is a device that people carry around and it must have excellent portability, operability, and maintainability. Wireless fixed radio station (FRS)
It has a function to access the radio system controller RCE via the and automatically register the location. In addition, if there is a need to register the location with another fixed wireless station due to the movement of the place as a person walks, the radio system controller RC is operated by the same operation as above.
It has a function to access E and change location registration. Incoming and outgoing call operations are possible from anywhere within the service area. In addition, when it is necessary to change (zone switch) the fixed wireless station FRS that is communicating while walking while talking, it may not be possible with the conventional system or it may have a bad effect such as temporarily disconnecting the call information. However, according to the present invention, as will be described later, a system without these adverse effects is possible.

Fig. 2 shows the hardware configuration of the mobile phone PTEL.

In FIG. 2, the radio signal transmitted from the fixed radio station FRS is received by the receiving antenna. This received signal is divided into two by the shared device and input to the receivers I and II, respectively.
In the receiver I, after being amplified to a required level, it is demodulated and part of it is sent to the control unit CPU (control signal of 200 bps), the other output is divided into two, one of which is input to the handset through the switch SW ₁ and the other. Input to the control unit CPU after passing through the decoder (2
400bps control signal). The control unit CPU has a storage unit, a speaker, a keyboard, and an interface, and has the functions indicated by the names.

Next, the signal input to the receiver II also has the same wiring configuration as the receiver I as shown in FIG. The switches SW ₁ and SW ₂ are driven by the control of the control unit CPU via the switch drive unit. That is, in synchronism with the switch SW ₁ being turned to or so that the voice signal of either the receiver I or II is input to the receiver, the switch SW ₃ causes the receiver I or II to move.
The control signal obtained at the output of is selected and input to the decoder.

Similarly, switch SW ₂ determines which receiver I or II will be used in conjunction with the transmitter. Further, the synthesizer I or II receives a command signal for a wireless channel to be generated from the control unit CUP, generates a local output of a desired frequency, and receives the receiver I or II.
II and transmitter. An electric field strength measurement output is supplied from the receiver I or II to the control unit CPU. This is used when switching the zone of the mobile phone PTEL described later.

Three inputs are added to the transmitter. One is the output of the transmitter, and the other is the control signal from the control unit CPU and the high-speed signal of 2400 bps that has passed through the encoder from the control unit. These are converted by a transmitter into a radio signal by modulation, added to a transmission antenna, and transmitted to a radio base station.

(Ii) Fixed radio station (FRS) Demodulates the digital downlink (direction from the radio control unit RCE to the mobile phone PTEL) signal from the radio system control unit RCE, converts it to a radio modulated wave, and sends it to the mobile phone PTEL. .
On the other hand, an up signal from the mobile phone PTEL (direction from the mobile phone PTEL to the radio system controller RCE) is received and demodulated, converted into a digital signal, and transmitted to the radio system controller RCE.

FIG. 3 shows the hardware configuration of a fixed wireless station (fixed wireless station FRS).

In FIG. 3, the radio signal transmitted from the mobile phone PTEL is received by the receiving antenna. This received signal is divided into three parts by the shared device and input to the device receivers I, II and III. In the receiver I, after being amplified to a required level, it is demodulated and divided into three. One of them is sent to the control unit CPU via the decoder (2400 bps control signal), the other is a switch.
A 200bps control signal sent to the control unit CPU via SW ₁₁ and a signal sent to the FRS / RCE interface via switch SW ₁₃ . The control unit CPU has a storage unit and an interface.

Next, the signal input to the receiver II also has the same wiring configuration as the receiver I as shown in FIG.

The switches SW ₁₁ and SW ₁₂ are driven by the switch driver under the control of the controller CPU. That is, in the switch SW ₁₃ , the audio signal of either the receiver I or II is input to the FRS / RCE interface or in synchronization with the input signal, and in the switch SW ₁₁ , the low speed input to the control unit CPU is performed. The control signal (200bps) is selected.

Similarly, switch SW ₁₂ is a receiver I used in collaboration with the transmitter.
Or determine II. Further, the synthesizer I, II or III receives a command signal for a wireless channel to be generated by the control unit CPU to generate a local output of a desired frequency, and the receiver I,
Supply II and III and transmitter. This is used when switching the zone of the mobile phone PTEL described later. Receiver III plays the role of an interference detector, and is a mobile phone that uses its radio channel before the transmitter emits radio waves.
Used to check if PTEL is nearby and does not interfere.

Three inputs are added to the transmitter. One is the voice signal of the other party, the control signal from the other control unit CPU and the high-speed signal 2400 bps that passed through the encoder from the control unit CPU,
These are converted into radio signals by modulation at the transmitter, added to the transmission antenna, and transmitted to the mobile phone PTEL.

(Iii) Radio control unit (RCE) The radio control unit (RCE) is a one-to-one correspondence between a fixed radio station (FRS) that covers the radio wave zone where the mobile phone (PTEL) is located and the mobile phone PTEL. Switching equipment PBX
It is a device that connects with an extension when making / receiving a call and forms a communication path. The radio system controller RCE consists of a PCM switch communication path and is connected by a microprocessor.

A block diagram of the radio system controller RCE is shown in FIG. In FIG. 4, the location registration from the mobile phone PTEL and the fixed radio station FRS that has notified the location registration are linked and stored in the storage unit MEM. When an incoming call is received from the extension of the exchange PBX, an incoming call signal including the ID of the called portable telephone PTEL is transmitted to all the fixed radio stations FRS under the control. The fixed radio station FRS receiving this searches the storage circuit (RAM) in its own mobile phone PTEL, and as a result, the called mobile phone PTEL is searched.
If the ID is selected, the mobile phone PTEL is called from the fixed radio station FRS. Then, the communication path between the exchange PBX extension and the fixed radio station FRS is connected.

When making a call from the mobile phone PTEL, use this as a fixed radio station.
It receives via FRS and sends it to the extension of the exchange device PBX that has a correspondence relationship with the mobile phone PTEL. And switching equipment PBX
Connect the communication path between the extension and the fixed radio station FRS. If it is an end-of-call notification from the fixed radio station FRS during a call, the call path is disconnected.

The main functions of the radio system controller RCE are as follows.

a) One-to-one between the extension of the exchange PBX and the mobile phone PTEL
Manage the correspondence of.

b) The location registration from the mobile phone PTEL is stored by linking it with the fixed radio station FRS through which it has passed.

c) When receiving an incoming call from the extension of the exchange PBX, select an empty fixed radio station FRS to be connected and connect both of them.

d) At the time of making a call from the mobile phone PTEL, the extension of the exchange PBX to be connected is determined, and both are connected for making a call.

e) Transmit dialing and hooking signals from the mobile phone PTEL during a call to the extension of the exchange PBX.

f) When the mobile phone PTEL moves to another radio zone during a call, it connects the mobile phone PTEL to the fixed radio station FRS there.

g) When there is an end call notification from the fixed radio station FRS during a call,
Disconnect the call path. Extension of the related exchange PBX,
Make the fixed radio station FRS and mobile phone PTEL free.

The system operation in which the above-described radio system control device RCE, fixed radio station FRS, and mobile phone PTEL are comprehensively operated will be described.

The system according to the present invention employs a distributed control system instead of the centralized control system used in the system itself.

The system consists of the radio system controller RCE-wired section of fixed wireless station FRS and fixed wireless station FRS-wireless section of mobile phone PTEL.
Break up.

In the wired section, the fixed radio station FRS is the main, and the radio system controller R
CE has a subordinate relationship-The radio system controller RCE notifies the fixed radio station FRS of an incoming call.

・ When the fixed wireless station FRS receives a line setting request, the specified line is connected according to the request.

-Relay communication from one fixed wireless station FRS to another fixed wireless station FRS.

In the wireless section, the mobile phone PTEL is mainly used, and the fixed wireless station FRS
Has a subordinate relationship ・ When receiving the incoming call information from the radio system controller RCE or when receiving a call request from the mobile phone PTEL, set the radio line, but at this time, select the radio line. Mobile phone PTEL will do.

・ Regarding location registration, the mobile phone PTEL checks the fixed radio station FRS that can be serviced by itself and notifies the fixed radio station FRS of the result directly or indirectly to register itself.

The call line is set in the order of a wireless line and then a wired line.

Therefore, when a call occurs, the fixed radio station FRS is first selected by the mobile phone PTEL and the radio line is set.

The fixed radio station FRS selected as a result is the radio system controller R.
Instruct the CE to connect to the outside line and complete the call line setting.

As mentioned above, the control of the mobile phone PTEL is made to be decentralized by having the center of the judgment in the line setting operation registration at the time of the incoming and outgoing calls including the position registration.

The distributed control reduces the load on the radio system controller RCE, and at the same time the wireless line settings are fixed radio station FRS-mobile phone PTE.
Since it can be done in the minimum section between L, the line setup time can be shortened.

In addition, control signal speed for wireless line control is 2400bps
By adopting an out-of-band control signal of 100 baud in the call state, it is possible to further shorten the line setup time and improve efficiency, and shorten the control channel occupation time. .

(I) Positional relationship When a call occurs, first the mobile phone PTEL and the fixed radio station FR
Control is performed to set up a wireless line between S, but in order to do this efficiently for a mobile phone PTEL that arbitrarily moves in the service area, in the fixed wireless station FRS, its own service area ( It is necessary to always keep track of the mobile phone PTEL that is in the zone, and to keep track of the fixed wireless station FRS that is also in the own service area (zone) of the mobile phone PTEL. is there. For this purpose, location registration is performed.

To facilitate location registration from mobile phone PTEL,
Figure 5 (a), which differs from the fixed radio station FRS depending on the state
Two types of notification signals as shown in (b) are transmitted.

Notification signal 1 Notification signal only for notification to mobile phone PTEL Notification signal 2 Notification signal for notification of mobile phone PTEL and transmission of incoming call information including incoming call information Fixed radio station FRS Regarding the notification mode, the following three modes are set. (See Fig. 6) (1) Stationary mode In this mode, only Pc-ch and Cc-ch are monitored.

(2) Notification mode 1 When in this mode, Pc-ch sends notification signal 2 when incoming information is generated, otherwise notification signal 1 for 4 seconds ± α intervals for 20 seconds. Send intermittently.

(3) Notification mode 2 When in this mode, Pc-ch sends notification signal 2 when incoming information is generated, otherwise notification signal 1 for 10 minutes at intervals of 4 seconds ± α. Send intermittently.

Location registration is performed by fixed radio station FRS and mobile phone P for each zone.
It is carried out by the following interaction with TEL.

Basically, the fixed radio station FRS needs to notify (transmit a control signal) while the mobile phone PTEL is in the service area of its own, and the mobile phone PTEL is not in the service area. If it is determined that the notification is stopped, the stationary mode is entered.

The determination for this mode transition is made independently in each fixed radio station FRS as follows.

The fixed radio station FRS needs to determine whether or not the mobile phone PTEL is in the service area of its own when the power is turned on and when the state transitions from the call state and the incoming state to the standby state.

Therefore, the notification mode 1 is unconditionally entered.

When the notification request signal or the position registration request signal from the mobile phone PTEL is not received during the notification mode 1, the stationary mode is entered after the notification mode 1 ends.

When the notification request signal or the position registration request signal from the mobile phone PTEL is received during the notification mode 1, it is determined that the mobile phone PTEL is in the area, and the notification mode 2 is entered from that time.

When the incoming call information is generated when the fixed radio station FRS is in the stationary mode, the notification mode 1 is entered from that time.

When the notification request signal or the position registration request signal from the mobile phone PTEL is received in the stationary mode, it is determined that the mobile phone PTEL is in the area, and the notification mode 2 is entered from that time.

If the notification request signal or the position registration request signal from the mobile phone PTEL is not received during the notification mode 2, it is determined that the mobile phone PTEL is not present, and the notification mode 2 is ended.

At this time, if incoming information is generated during the period of the notification mode 2 and 20 seconds or more has elapsed from the generation, the stationary mode is entered.

After the notification mode 2 ends, if the incoming call information occurs during the notification mode 2 period and 20 seconds or more has not elapsed since the generation, the notification mode 1 is entered.

FIG. 6 shows a fixed radio station FRS broadcast mode transition diagram.

Next, the location registration control of the fixed wireless station FRS will be described.

When the fixed radio station FRS receives the position registration request signal from the mobile phone PTEL in the notification mode (1, 2) or in the stationary mode, when it includes its own SID, The location registration processing is performed for the PID included in the signal, and the location registration response signal is transmitted to the mobile phone PTEL.

As the position registration processing, a "PID registration table" (Table 1) is generated in its own memory (storage unit in Fig. 2), the PID included in the signal is registered therein, and the wireless system control is performed. This is notified by sending a location registration request command to the device RCE.

Here, the electric field strength is the received electric field strength of the location registration request signal, and the registration timer starts from the time of registration, and a maximum of 180 times / 10
Seconds (30 minutes). Further, the in-range state is set to the in-range state when an incoming call occurs and the incoming call is abandoned, and when a notification of an incoming call timer error is received from the radio system controller RCE. In addition, when the presence of the mobile phone PTEL is confirmed, such as when a signal from the mobile phone PTEL that has become unknown is received, it is determined that the mobile phone is in the service area.

Next, the location registration deletion control of the fixed radio station FRS will be described.

When the location registration deletion request signal from the mobile phone PTEL is received, the fixed wireless station FRS specified by this signal only when the own SID is included in it (Fixed wireless station FRS you want to delete the location registration) In contrast, the radio system controller RCE
This is notified via and a position registration deletion response signal is transmitted to the mobile phone PTEL.

Upon receiving the notification, the fixed wireless station FRS deletes the corresponding PID on its own “PLD registration table”.

FIG. 7 shows a flow chart of the position registration operation.

Next, the position registration control viewed from the mobile phone PTEL will be described.

When the mobile phone PTEL receives the notification signal from the fixed wireless station FRS and checks the electric field strength of the signal and exceeds a certain value, it determines that its own service is possible and performs location registration for the fixed wireless station FRS. At the same time, the fixed wireless station that registered the location
Register FRS in its own internal table shown in Table 1.

Therefore, in order to notify the presence of the self and prompt the transmission of the notification signal, the mobile phone PTEL transmits a notification request signal to the fixed wireless station FRS when the power is turned on and when the call state transits to the standby state.

Further, the notification request signal is transmitted after, for example, 10 seconds (notification detection allowable time = 4 seconds × 2.5: notification cycle) after the notification from the fixed radio station FRS cannot be detected.

In addition to this, even when the notification from the fixed radio station FRS is received, the notification request is transmitted from the mobile phone PTEL when the reception level is equal to or lower than a predetermined value and the specified number of times is received.

When the mobile phone PTEL moves to a new wireless zone due to movement and receives a notification signal from the fixed wireless station FRS installed there, regarding the SID included in the signal,
Internal "SID registration table" (storage unit in Fig. 2)
To search.

As a result, if it has been registered, it updates the "field strength" and "registration timer" associated with the SID. If not registered, the location registration process is performed on the fixed wireless station FRS corresponding to the SID included in the signal.

As the position registration processing, a position registration request signal is transmitted, and the reception of a position registration response signal from the fixed radio station FRS is waited for. After that, when the location registration response signal is received within the specified waiting time, this is registered in the "SID registration table" for "SID", "field strength" and "registration timer".

When the location registration response signal is not received, the location registration request signal is retransmitted. If it is not received even after resending the specified number of times, it is regarded as location registration failure and “SID registration table”
Will not be registered.

Finally, the location registration control in the radio system controller RCE will be described.

The radio system controller RCE does not have a direct judgment function for location registration control, and manages only result information about location registration notified from the fixed radio station FRS. Management is performed by the "PID-SID registration table" (M in Fig. 4) in the radio system controller RCE.
EM) is generated and registration or deletion is performed according to the information notified from the fixed radio station FRS.

There are two types of information notified by the fixed radio station FRS: "location registration information" and "location registration deletion information", which are notified by "location registration request command" and "location registration deletion command", respectively.

Further, the radio system control device RCE relays the “location registration deletion command” to the specified or all fixed radio stations FRS according to the instruction included in the command.

(Ii) When the incoming radio system control unit RCE receives an incoming call from the exchange PBX, it controls the incoming call for that call. When performing incoming call control, a "incoming call PID registration table" (MEM in FIG. 4) is generated in the radio system controller RCE to perform incoming call control.

Incoming calls are set up and connected by the radio system controller RCE in the following order.

When receiving a call, the radio system controller RCE
After registering in "PID registration table", all fixed radio stations FRS
A command G for receiving start execution is sent to the.

When an incoming call setting request command is received from a fixed radio station FRS that has successfully connected to a wireless line, the incoming call setup is completed to notify all the fixed radio stations FRS that the incoming call destination has been determined. Send a notification G command.

At the same time, the S that made the incoming call setting of the "SID status table"
Register the incoming PID in the ID to activate the incoming mode.

When an incoming call response request command is received from the fixed radio station FRS, refer to the “SID status table” to confirm that the SID is in the incoming mode, and then connect the line between the fixed radio station FRS and the exchange PBX. While doing, "SID status table"
Change the mode of the above SID to the call mode and register it.
Delete the PID from the ID registration table.

This ends the incoming call processing.

The incoming call control of the fixed radio station FRS is performed in the following order.

When receiving the incoming start execution instruction G command from the radio system controller RCE, if the PID is registered in its own “PID registration table” when it is in the standby state, the external incoming call state is entered and the following Perform incoming / outgoing call processing.

In Cc-ch, the incoming signal is sent to the PID specified by the incoming call start execution instruction G command, and the mobile phone P
Wait for incoming call response signal from TEL.

After that, receive the incoming call response signal from the mobile phone PTEL,
If your SID is included in the destination SID of the same signal,
Performs wireless line connection processing under the initiative of mobile phone PTEL.

When the wireless line setting is completed and the wireless line connection request signal from the mobile phone PTEL is received, an incoming call setting request command is sent to the wireless system controller RCE, and the wireless system controller
This is notified to all fixed radio stations FRS via RCE.

The fixed radio station FRS transmits a ringing tone ringing signal to the mobile phone PTEL in order to ring the ringing tone. After that, when a line connection request signal addressed to itself is received from the mobile phone PTEL, an incoming call response request command is sent to the radio system controller RCE, and a transition is made to the call state.

This completes the external call origination process. FIG. 8 shows a state transition diagram in this case.

Next, the wireless line connection processing will be described.

Fixed radio station FRS, for the Cc-ch uplink and downlink,
Perform carrier detection. As a result, when it is confirmed that it is available, an incoming signal is transmitted to the mobile phone PTEL.
After completion of the incoming signal transmission, for example, it waits for a response from the mobile phone PTEL for 1 second.

If there is no response from the mobile phone PTEL during this period, after waiting for α seconds, the incoming signal is again transmitted (retransmitted) and the standby for 1 second is started. (Α is a fixed wireless station
It is determined by the random timing set independently for each FRS. ) During this time, if there is no response from the mobile phone PTEL, the wireless line connection fails.

The signal elements of the incoming signal are as shown in FIG. 5 (c). The empty call channel is information for one channel of S-ch, which the fixed radio station FRS has previously detected empty.

The transmission of the mobile phone PTEL incoming response signal in response to this will be described.

The mobile phone PTEL uses the following judgment criteria from among the incoming signals received within a maximum of 1 second from the completion of receiving the incoming signal from the fixed wireless station FRS that first arrived at itself in Cc-ch. Select one.

In the incoming signal, the designated S-ch information is compared with the S-ch information which has been detected in advance on the mobile phone PTEL side, and the incoming signal having the matching information is checked.

From the incoming signals having the same empty S-ch information, the signal with the highest signal reception electric field strength and the best quality is selected.

At this time, if there is no signal having the received electric field strength of the above level, the first received signal is selected from the fixed radio stations FRS showing the remaining reception quality.

If it is not possible to select by ,, select according to among the signals that do not satisfy the condition of 1).

An incoming call response signal including the SID selected above is returned to the fixed radio station FRS.

Call channel acquisition is performed as follows.

When the fixed radio station FRS receives an incoming call response signal from the mobile phone PTEL addressed to itself, the fixed radio station FRS sequentially performs the empty detection for the designated three S-chs. When the empty S-ch is detected, the channel switching completion signal is continuously transmitted to the mobile phone PTEL for about 0.5 seconds. During this time, the non-turning line connection request signal from the mobile phone PTEL must be received.

If the S-ch is not empty and if the continuous transmission of the channel switching completion signal for about 0.5 seconds is completed, the wireless line connection fails.

The mobile phone PTEL sequentially searches for the specified S-ch,
Wait for the channel switching completion signal from the fixed radio station FRS. When receiving the channel switching completion signal, the fixed wireless station
A wireless line connection request signal is transmitted to FRS.

When the mobile phone PTEL cannot receive the channel switching completion signal from the fixed radio station FRS, the mobile phone PTEL side
Performs incoming call response processing. If this fails, the mobile phone PTEL fails to connect to the wireless line and returns to the standby state.

The signal elements of the channel switching completion signal and the wireless line connection request signal are as shown in FIGS.

When the fixed radio station FRS receives a radio line connection request signal from the mobile phone PTEL, the radio station controller RCE
Sends an incoming setting request command and sends all fixed radio stations FRS
The fixed radio station FRS continuously transmits a ringing tone ringing signal to the mobile phone PTEL connected to the radio line, while notifying the fact to the mobile phone PTEL via the radio system controller RCE. The mobile phone PTEL rings the incoming signal while receiving it.

After that, when there is a call-in operation on the mobile phone PTEL side, a call-in signal is transmitted to the fixed radio station FRS, and the call state is entered. When the fixed radio station FRS receives this, it sends an incoming call response request command to the radio system controller RCE, and enters the call state.

The signal elements of the incoming ringing signal and the incoming call signal are shown in Fig. 5 (g).
As in (h).

(Iii) Calling The mobile phone PTEL performs a calling process when a calling request is made, and connects a wireless line with the fixed wireless station FRS. After the wireless line connection with the mobile phone PTEL is completed, the fixed wireless station FRS sends a call origination request command to the wireless system control device RCE to set the communication line.

In the case of the normal transmission processing, in the case of the normal transmission processing, among the fixed wireless stations FRS registered in the “SID registration table” (FIG. 2 MEM) inside the mobile phone PTEL, three fixed wireless stations FRS are selected. The outgoing call is controlled.

Further, in the case of the re-originating process, the originating process is performed to unspecified fixed wireless stations FRS (all fixed wireless stations FRS in the standby state).

The transmission operation will be described in detail below.

When a call origination request is issued, the mobile phone PTEL performs carrier detection for Cc-ch (control channel) downlink. As a result, when it can be confirmed that it is free,
Of the SIDs registered in the registration table ”, the condition is good S
For example, a maximum of three IDs are selected, and a transmission signal as shown in FIG. 5 (i) is transmitted by Cc-ch.

The outgoing signal is continuously transmitted for a maximum of 1 second, during which the fixed wireless station
Wait for a response from FRS. If there is no response from the fixed radio station FRS, the normal transmission fails and the restart process starts after 1 + α seconds have elapsed. Here, α is determined by random timing independently set for each fixed radio station FRS.

SIDa to c ... Arrange in order of descending conditions according to destination SID. This sequence becomes the timing information to which the fixed radio station FRS responds.

cha to c ... According to the empty call channel information, the S-chs (call channels) that have been detected as being empty on the mobile phone PTEL side are arranged in the order of newest confirmation time.

FIG. 9 shows a state transition diagram in this case.

When the fixed radio station FRS receives an outgoing signal from the mobile phone PTEL, when its own SID is included as the destination SID, it searches sequentially for the S-ch designated by the same signal. To do. As a result, when an empty S-ch is detected, the S-ch with the latest confirmation time is added to the fifth S-ch.
The transmission response signal as shown in FIG. 11 (j) is transmitted to the mobile phone PTEL at the timing designated by the arrangement of the destination SIDs.

When the mobile phone PTEL receives a call origination response signal from the fixed radio station FRS, the mobile phone PTEL selects a signal satisfying the following conditions from among them.

The empty S-ch information designated in the call origination response signal is compared with the S-ch information which has been previously detected on the mobile phone PTEL side, and a signal having matching information is checked.

The signal having the highest signal reception electric field strength is selected from the transmission responses in which the empty S-ch information matches. At this time, L4
If there is no signal with the received field strength of (the field strength is divided into 5 levels, the field strength becomes weaker as the numerical value becomes smaller), the first received signal from the remaining L3. Select a signal.

If it is not possible to select by, select from among the signals that do not satisfy the condition of.

When the mobile phone PTEL detects the call origination response signal as described above, it transmits the fixed radio station FRS designation signal to the fixed radio station FRS that has transmitted the signal. After this, fixed radio station FR
Both S and mobile phone PTEL enter the call channel.

Call channel acquisition is performed as follows.

When the fixed wireless station FRS has addressed the fixed wireless station FRS designating signal from the mobile phone PTEL to the self, the fixed wireless station FRS sequentially performs the empty detection for the designated three S-chs. When the empty S-ch is detected, the channel switching completion signal is continuously transmitted to the mobile phone PTEL for about 0.5 seconds.

The mobile phone PTEL sequentially searches for the specified S-ch,
Wait for the channel switching completion signal from the fixed radio station FRS. When receiving the channel switching completion signal, the fixed wireless station
Send a line connection request signal to FRS.

When the fixed radio station FRS receives the line connection request signal from the mobile phone PTEL, it sends a call origination connection request command to the radio system controller RCE, and also the radio system controller RC.
This is notified to all fixed radio stations FRS via E.

The mobile phone PTEL enters the call state from the time when the transmission of the line connection request signal is completed.

(Iv) Zone switching Zone switching will be described below.

A call is generated, and outgoing or incoming call processing is executed, and the call state is entered after completion. In the call state, it is possible to send dial signals to the line and send and receive voice signals, but the state of the wireless line is changed by moving the mobile phone PTEL or moving obstacles around the line (including people). Change occurs.

Therefore, the state of the wireless line is managed by monitoring the received electric field strength between the mobile phone PTEL and the fixed wireless station FRS, and if necessary, wireless line management processing such as zone switching processing and out-of-service processing. I do. In addition, the transmission of control signals during a call is out of the voice band (Sv
o-ch).

When the mobile phone PTEL moves during a call and the distance to the fixed wireless station FRS that is correspondingly communicating increases and the call quality deteriorates, zone switching is performed.

The mobile phone PTEL will notify the fixed radio station FRS when the received electric field strength of the fixed radio station FRS or the received electric field strength of its own fixed radio station FRS drops below a certain value due to the terminal confirmation signal from the fixed radio station FRS. On the other hand, the monitor request signal as shown in FIG. 5 (k) is transmitted.

When the fixed radio station FRS receives the same signal from the mobile phone PTEL, it sends a monitor request command to the radio system controller RCE. As a result, all fixed radio stations FRS in the expected state monitor the S-ch designated according to the command.

For the sake of convenience, the fixed radio station FRS currently in the call will be referred to as “fixed radio station FRSs” or the switching destination fixed radio station FRS will be referred to as “fixed radio station FRS” for convenience.
d ".

Zone switching request PTEL continuously sends the zone switching signal after sending the monitor request signal. The zone switching request signal is transmitted by Svo-ch and has the signal element shown in FIG. 5 (l).

P ₁ · S-ch information; S-ch information that has been searched for in advance on the mobile phone PTEL side P ₂ Q information; currently used line quality information When Q ≦ l1 is satisfied in this state, zone switching processing 2 to go into.

Zone switching request response When the fixed wireless station FRS that is monitoring receives the zone switching request signal on the monitored Svo-ch under the following conditions, it enters the zone switching state from the standby state.

-Zone switching request signal reception condition (zone switching request signal reception electric field strength)> (Q information specified by the same signal) The fixed radio station FRS that has entered the zone switching response state, regarding the S-ch information included in the same signal. Sequential search is performed, and if a vacant S-ch is detected, the S-ch information is detected. If vacancy detection fails, the fixed radio station FRS side detects that the S-ch is empty.
A zone switching response signal such as that shown in Fig. 5 (m) with -ch information is continuously transmitted after empty detection of Cc-ch up and down on Cc-ch, and FRS from mobile phone PTEL is monitored on Svo-ch to be monitored. Wait for reception of specified signal.

Fixed radio station FRS designation When the mobile phone PTEL receives a zone switching compatible signal on Cc-ch under the following conditions, it replaces the zone switching request signal continuously transmitted on the Svo-ch currently in use with the call with the following The FRS designation signal added with the S-ch information selected by is continuously transmitted.

After this, the fixed radio station FRS and the mobile phone PTEL are both switched.

-Zone switching acceptance signal reception condition (zone switching acceptance signal reception electric field strength information)> (currently used line quality Q) S-ch selection conditions are as follows.

1) If the S-ch information included in the zone switching acceptance signal matches the empty S-ch information that has already been searched for, the S-ch information
If ch information 2) 1) is not satisfied, empty detection is performed for that S-ch, and if empty is confirmed, if S-ch information 3) 2), 1) is not satisfied, mobile phone PTEL Side newly detects an empty channel, and the S-ch for which empty is confirmed
The information switching destination S-ch acquisition is performed as follows.

When the fixed radio station FRSd receives an FRS designation signal such as that shown in Fig. 5 (n) addressed to itself on the Svo-ch of the monitor channel under the following conditions, it detects an empty S-ch designated by the signal. To do.

・ FRS designated signal reception condition (FRS designated signal received electric field strength) ≧ (Q information designated by the same signal) When the S-ch sky is confirmed as a result of the sky detection, the same channel of Fig. 5 (o) Such channel switching completion signal is continuously transmitted.

Also, if the S-ch is not empty, if the continuous transmission of the channel switching completion signal for the specified time (channel switching completion signal maximum transmission time) is completed, and if the fixed radio station FRS designation signal cannot be received. Returns to the standby state.
(The monitor request is not canceled.) The mobile phone PTEL receives the S-ch designated in the FRS designation signal and waits for the self-addressed channel switching completion signal from the fixed radio station FRSd.

When the channel switching completion signal is received under the following conditions, the line link request signal as shown in FIG. 5 (p) is continuously transmitted instead of the FRS designation signal being continuously transmitted by the Svo-ch currently in use.

-Channel switching completion signal reception condition (channel switching completion signal reception electric field strength)> (currently used line quality Q) The mobile phone PTEL starts the continuous transmission of the FRS designated signal, and then the specified time (FRS designated signal maximum transmission). If the channel switching completion signal cannot be received from the fixed wireless station FRS on the designated S-ch even after the elapse of time), the fixed wireless station FRS
The capture fails and the zone switching request is entered again.

Line link The fixed radio station FRSd sends a connection request command to the radio system controller RCE when it receives a line link request signal from the mobile phone PTEL on Svo-ch during monitoring under the following conditions.

-After receiving the line link request signal reception condition (line link request signal reception electric field strength) ≥ (currently used line Q), when the fixed radio station FRSd receives a connection completion notification command from the radio system controller RCE, it switches channels. Svo
Start continuous transmission of terminal confirmation signal on -ch.

In addition, when the connection completion notification command from the radio system controller RCE is not received within the specified time after sending the connection request command, the process returns to the standby state. (The monitor request is not cancelled.) Switching The mobile phone PTEL is the Svo-ch of the switching destination and the fixed wireless station FRS.
The line quality Q that is received from the terminal confirmation signal from d and is determined from the electric field information of itself included in the signal and the received electric field strength of the fixed wireless station FRSd is (mobile phone PTEL-fixed wireless station FRSd line quality Q) ≧ (PT
EL-Fixed radio station FRSs When the line quality Q) is satisfied, the call line is switched from the fixed radio station FRSs to the fixed radio station FRSd.

After switching the call line, the mobile phone PTEL starts continuous transmission of the terminal confirmation signal on Svo-ch.

When the fixed radio station FRSd receives the terminal confirmation signal from the mobile phone PTEL, it sends a status setting request command to the radio system controller RCE and also sends to all the fixed radio stations FRS via the radio system controller RCE. And sends a switching completion notice G.

When the fixed radio station FRSs receives the above notification via the radio system controller RCE, it releases the radio line, sends a disconnection request command to the radio system controller RCE, and returns to the standby state.

Further, when the other fixed wireless station FRS receives the above notification, it cancels the monitor for the mobile phone PTEL.

An example of the zone switching process 1 is shown in FIG.

Finally, the ending of the incoming and outgoing call operation, which is left in the system description of the present embodiment, will be described.

Cell phone PTEL end call When the call termination is operated on the cell phone PTEL during a call, or when the call ends as a result of the out-of-range process (see out-of-range process), the end-of-line process starts.

At this time, the mobile phone PTEL continuously sends an end signal to the Svo-ch of the currently used communication line for a specified time, and returns to the transmission completion standby state in any state.

Fixed radio station FRS end call The fixed radio station FRS performs end call processing when it receives a call end signal from the mobile phone PTEL during a call, and when out-of-range processing results in end of call (see out-of-range processing). enter.

At this time, the fixed radio station FRS continuously transmits an end signal at the Svo-ch of the currently used communication line for a specified time, and requests the wireless control device RCE to end the call regardless of the state. Send a command, via the wireless system controller RCE,
This is notified to all fixed radio stations FRS.

Further, all the fixed radio stations FRS cancel all the processes related to the call with the mobile phone PTEL.

Radio system control device RCE end of call The radio system control device RCE receives the end call request command from the fixed radio station FRS, cancels all processing related to the call with the fixed radio station FRS, and notifies the exchange PBX. The end signal is transmitted. The exchange apparatus PBX receives this signal and, when it is connected from the outside line, transmits a termination signal to the exchange.

The case where the present invention is applied to a large-scale high-rise building has been described above. However, it is obvious that the present invention can be applied not only to the inside of a building but also to a premises, an urban area, and a residential area. is there.

(5) Effects of the Invention As described above, by applying the system construction using the distributed control method according to the present invention to the small zone method using microcells, a mobile phone located anywhere in the service area. It is possible to make and receive calls between the mobile phone and other mobile phones or fixed-line phones, and to improve the reliability and quality of communication, as well as the effective use of frequencies, which is an effect to improve the convenience of communication. There is an extremely large one.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing an embodiment of the present invention, and FIG.
FIG. 1 is a block diagram showing an example of a mobile phone used in the present invention, FIG. 3 is a block diagram showing an example of a fixed radio station used in the present invention, and FIG. 4 is a radio system controller 1 used in the present invention.
5 is a block diagram showing an example, FIGS. 5 (a) to 5 (p) are examples of signal formats used in the present invention, and FIG. 6 is a diagram showing an example of state transition of a fixed wireless station used in the present invention. FIG. 8 is a flow chart showing an operation example of a location registration request in the present invention,
FIG. 9 is a flow chart showing an operation example of an incoming call according to the present invention.
FIG. 10 is a flowchart showing an operation example of transmission in the present invention.
FIG. 6 is a flow chart showing an operation example of the zone switching processing in the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location 7605-5K H04Q 7/04 C 7605-5K J (72) Inventor Haruo Otsuka Kugayama, Suginami-ku, Tokyo 1 7-41, Iwasaki Communications Co., Ltd. (72) Inventor Tsunetaka Sakata 1-741, Kugayama, Suginami-ku, Tokyo Within 7-41 Iwasaki Communications Co., Ltd. (72) Kazuhide Okamura 1 Uchisaiwaicho, Chiyoda-ku, Tokyo (1) No. 1-3 in Tokyo Electric Power Co., Inc. (56) Reference JP-A-63-276334 (JP, A) JP-A-63-176027 (JP, A) JP-A-2-95037 (JP, A)

Claims (1)

[Claims] 1. A plurality of fixed radio stations, each of which is arranged so as to cover a corresponding zone among a plurality of zones to form a service area and sends out a unique broadcast signal, respectively, and which are located in the service area. A mobile body including a plurality of mobile phones capable of communicating with any one of the plurality of fixed wireless stations, and a wireless system control device provided for connecting the plurality of fixed wireless stations and a general telephone network. In the communication system, each of the plurality of mobile phones has a SID registration table that records the state of location registration, and sends a location registration request signal for location registration to the fixed wireless station, The SID registration table has a function of renewing and registering the location registration status for at least one of a plurality of fixed wireless stations at any time. Is given, PID has a registration table, the plurality of the location registration request signal to the state of the location registration in the fixed service zone of the radio station of the portable telephone in response PID from each of the mobile phone
The registration table has a function of updating and updating at any time, and in the wired section between the plurality of fixed wireless stations and the wireless system control device, the plurality of fixed wireless stations are the main and the wireless system control device is the subordinate. The line setting is performed by referring to the registration state of the PID registration table in the relationship, and the plurality of mobile phones are mainly used in the wireless section between the plurality of fixed wireless stations and the plurality of mobile phones. A mobile communication system characterized in that the wireless station is configured to perform line setting by referring to the registration state of the SID registration table in a subordinate relationship.