JPH02222222A - Mobile object communication system - Google Patents

Abstract

PURPOSE:To improve the quality at signal transmission and to utilize the frequency effectively by setting the radio channel of a portable telephone set individually responding to each application. CONSTITUTION:Plural control radio channels are made available simultaneously depending on applications such as position registration, outgoing call and incoming all while the channel is not limited to one channel as the radio channel for the control of a portable telephone set PTEL. For example, a control channel (a) is used as a position registration channel to apply annunciation, position registration and release of position registration, while the control channel (b) is used as an outgoing/incoming control channel to apply incoming/outgoing zone switching. Thus, since plural control radio channels are used, the reliability and quality of communication are improved and the effective utilization of the frequency is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical field to which the invention pertains In mobile communication using a small zone configuration, the present invention secures calls to and from mobile terminals at all times from any location within the service area, and It relates to a communication method and system that satisfies the communication quality when the communication quality deteriorates due to the movement of mobile terminals.More specifically, it concerns frequency effective utilization rate 9 communication quality, wireless line control ability, etc. It is related to a communication system that is excellent in terms of communication.

(2) Conventional technology and its problems Generally, when performing mobile communication within a wide service area, one wireless base station covers the entire area and provides service.
The method for communicating with mobile objects within an area is called the large zone method. In contrast, the small zone method
The area is divided into multiple small areas, one wireless base station is installed in each divided area, and mobile wireless devices in each area communicate with these wireless base stations. be.

The conventional small zone method, for example, is currently in commercial service.
It is adopted in the TT car phone system [Reference Yoshiyuki et al. “Car phone radio line control °’ Nippon Telegraph and Telephone Telecommunications Research Institute Research and Practical Application Report Vol.

26, Nα71885 pages].

First, as a method of processing incoming calls to mobile devices that move anywhere within a service area, a method is used in which calls are made all at once only in areas where mobile devices are known in advance.

Location registration is performed by notifying the mobile telephone exchange of the location of the mobile device. A signal regarding location information for location registration is sent to the incoming call control channel on which the mobile station is waiting, and this signal is made different for each paging area. A mobile device registers its location by automatically transmitting a location registration signal when it detects a change in a location information signal.

The next time the mobile station makes a call, it uses the outgoing control channel available in the control zone where the mobile station is located. In this case, since the number of the outgoing control channel is always broadcast on the incoming control channel, the mobile device memorizes this number and uses the channel with an empty indication (idle line control method). As mentioned above, on the base station side, radio waves from the mobile device are received by multiple wireless base stations, and as a result, the wireless zone in which the mobile device is located is identified (located), and an empty communication channel that can be used in that wireless zone is detected. By specifying it, you can make a call.

Furthermore, incoming calls will be explained. The mobile station is waiting on the incoming call control channel. When the mobile station moves to another control zone, it is necessary to switch to the incoming control channel used in the disconnected control zone.

Therefore, when the reception level of the incoming control channel drops below the required value, the mobile device has a function that selects and captures the channel that is received at the required level or higher from the multiple channels allocated for incoming call control. Identify control zones.

Therefore, when a mobile phone receives a call from the fixed telephone network, the mobile telephone exchange can make a simultaneous call from all wireless base stations within the control zone (or zones) in which the location is registered. mobile base stations will be called.

The above is an overview of systems in practical use, but various problems will occur if a system as described below is constructed.

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

■It can be used not only inside a car, but also when a person can take it out of the car and use it while walking. This is the first step toward realizing the ultimate telephone, a system that allows calls to be made ``anytime, anywhere, anywhere'', but in order to achieve this, it is necessary to downsize mobile radio equipment.

■To improve usability, for example, lengthen the battery charging cycle (
Therefore, the wireless transmitter output must be slow (5i
It is necessary to reduce power consumption, including from natt to about 10 mW).

■It is necessary to maximize the utilization efficiency of the frequencies used.

This is a major premise for realizing a system that can accommodate millions of subscribers.

One system proposal (draft) that satisfies these requirements has already been proposed by the inventor of the present invention [Reference, Ito "Study of mobile phone systems - Focusing on radio line control and routing" IEICE Technology Research report C387-1
6 May 1986].

According to this proposal, the following conditions are met:

■The number of subscribers accommodated in the system can cover all citizens of our country.

It is possible to realize a size that can be carried by 0 people.

■It can be as small and lightweight as a cordless phone. However, the transmission power is about l10l1.

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

(2) Equivalent distribution of system control in which each mobile phone takes the lead [Phase] A single set of transmitter/receiver, ie, one wireless channel, is sufficient for the wireless transmission and reception capability possessed by the mobile phone master device.

(2) In addition to having multi-channel access capability, the transmitter/receiver in the [Phase] section also has radio line control capability, ie, control channel usage capability, and radio channel communication capability, ie, communication channel usage capability.

Further, regarding the location registration of a mobile phone, which is a problem in a system that adopts the extremely small zone method with a radius of 25 m as described above, the following document has been proposed.

(Reference: Ito, “Study of mobile phone systems - Proposal of multiple location registration and application to system operation - Institute of Electronics, Information and Communication Engineers Technical Research Report RC, 38B, September 1986”) Using this proposal, the following problems can be solved. It was decided that this would be done.

■In a small zone system using a small zone (microcell) with a radius of 25 to 1QOm, the service area of one wireless base station is extremely narrow, and the distance between the transmitting antenna and receiving antenna is short, so short-distance radio wave propagation is possible. It becomes an area that follows its characteristics and takes on a complex appearance due to the influence of topography and features.

In a service area in such a state, if a mobile device registers its location, many wireless base stations will be able to receive signals from the mobile wireless device, making it difficult to determine which area the mobile device is in. However, they decided to register their locations with multiple wireless base stations that received good signals. As a result, making and receiving calls has become easier.

■The use of control signals for location registration is reduced, reducing radio wave interference.

0 frequency (radio waves) can be used effectively.

■It becomes easier to take measures when call traffic congestion occurs, and call losses are reduced.

■Transmit and receive diversity can be easily applied,
This can be used to improve call quality.

Although the above advantages have become clear, no concrete system proposals have been made yet.

(3) Purpose of the Invention The purpose of the present invention is to construct a system that has a high frequency utilization rate, can accommodate a large number of subscribers, and has high serviceability as a mobile communication system using microcells based on the above-mentioned conventional technology. The aim is to provide a mobile communication system that can

(4) Structure and operation of the invention Figure 1 shows the present invention in a large-scale high-rise building
This is an example in which the present invention is applied to a system whose service area is within the 1st floor (21st floor above ground).

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

The system of the present invention is a wireless system control device (radio system control device ER).
CE), a fixed radio station (fixed radio station FR3), and a mobile phone (mobile phone P), and realizes a service that allows calls to be made from anywhere within the service area, anytime, anywhere.

However, the above-mentioned service content is limited to
It is also possible to perform the process between a mobile phone P and a fixed telephone set in a building, or between a mobile phone and a telephone installed on an outside line (beyond a private branch exchange).

The feature of the present invention, as already mentioned, is that the center of decision-making for mobile phone location registration and call/call operations is placed in the terminal, rather than in the center of the wireless system control device, etc., as in conventional systems. As a result, the load on the central wireless system control device is lightened, and the work speed is increased.
This makes it easy to add more terminals and expand the system.

Furthermore, when using wireless channels to transmit and receive control signals used when making and receiving calls when registering the location of a mobile phone, we will use radio channels to effectively utilize frequencies and improve the quality of signal transmission. Configure wireless channels individually,
This enables optimal design as a wireless system.

Each component used in the configuration of the present invention shown in FIG. 1 will be explained in detail below.

(i) Mobile phone (P location) It is a device that people carry around, and it is portable and easy to operate.

Must have excellent maintainability. It has a function of wirelessly accessing the radio system control device RCE via a fixed radio station (FR3) and automatically registering the location. In addition, when a person moves from place to place due to walking and it becomes necessary to register the location with another fixed wireless station, a function similar to the above is used to access the radio system control device RCE and change the location registration. have Call operations can be made or received from any location within the service area. In addition, if it becomes necessary to change the fixed wireless station FR3 (zone switching) that is communicating with the opposite station due to walking during a call, it may be impossible to do so with the conventional system, or the call information may be temporarily disconnected or other adverse effects may occur. However, according to the present invention, as will be described later, a method that does not have these adverse effects is possible.

FIG. 2 shows the hardware configuration of the mobile phone P.

In FIG. 2, a radio signal transmitted from fixed radio station FR3 is received by a receiving antenna.

This received signal is divided into two parts by a shared device and inputted to receivers (1) and (2), respectively. Receiving machine! Then, after being amplified to the required level, it is demodulated and a part of it is sent to the control unit CPU (
The other output is divided into two parts, one of which passes through the switch SWl and is input to the handset, and the other passes through the decoder and is input to the control unit CPU (2400 bps control signal).The control unit CPU stores the It has an interface with the main unit, switches, and keyboard, and each has the functions indicated in its name.

Next, the signal input to the receiver H also has the same wiring configuration as the receiver 2, as shown in FIG.

The switches SW and SW2 are driven by the control unit CPU via the switch driving unit.

That is, in synchronization with turning the switch SWI to ■ or ■ so that the audio signal from either receiver I or ■ is inputted to the receiver, the switch SW3 is activated. Alternatively, the control signal obtained at the output of H is selected and input to the decoder.

Similarly, switch SW2 determines which receiver (1) or (2) is used in conjunction with the transmitter. In addition, the synthesizer I or (2) receives a command signal for the wireless channel to be generated from the control unit CPU, generates a local oscillation output of a desired frequency, and transmits the signal to the receiver I.
or ■ and supply to the transmitter. The output for field strength measurement is supplied from the receiver (1) or (2) to the control unit CPU.

This is used when changing the zone of the mobile phone P, which will be described later.

Three human forces are applied to the transmitter. One is the transmitter output, and the other is a control signal from the control unit CPU and a high-speed signal of 2400 bps passed through the encoder from the control unit. These are converted into radio signals by modulation at the transmitter, applied to the transmitting antenna, and transmitted to the radio base station.

(ii) Fixed radio station (FR3) Demodulates the digital downlink signal from the radio system controller RCE (from the radio system controller RCE to the mobile phone P location), converts it into a radio modulated wave, and sends it to the mobile phone P location. Send. On the other hand, it receives and demodulates the uplink signal from the mobile phone P (direction from the mobile phone P to the radio system control device RCE),
It is changed into a digital signal and transmitted to the radio system control device RCE.

FIG. 3 shows the hardware configuration of the fixed radio station (fixed radio station FR3).

In FIG. 3, a radio signal transmitted from a mobile phone P is received by a receiving antenna.

This received signal is divided into three parts by the shared equipment, and the equipment receiver 1. I
I and ■ are input. At the receiver (2), the signal is amplified to the required level, demodulated, and divided into three parts. One of them is sent to the control unit CPU via the decoder (2400b).
ps control signal), the others are a 200 bps control signal sent to the control unit CPU via the switch SWlt,
This is a signal sent to the F RS/RCE interface via switch SW I3. The control unit CPU has a storage unit and an interface.

Next, the signal input to the receiver (2) also has the same wiring configuration as the receiver (2) as shown in FIG.

The switches S W + + and S W r t are driven by a switch driver under the control of the controller CPU.

That is, in synchronization with the switch 5WI3 being turned down to ■ or ■ so that the audio signal of either the receiver ■ or ■ is input to the FR3/RCE interface, the switch SW is input to the control unit CPU. Low speed control signal (
200 bps) is selected.

Similarly, the switch SW, t determines which receiver I or {circle around (2)} is used in conjunction with the transmitter. Also, synthesizer 1. If
Or (2) receives a command signal for a wireless channel to be generated by the control unit CPU and generates a local oscillation output of a desired frequency, and the receiver 1. Supply II and ■ to the transmitter.

This is used when switching the zone of the mobile phone P, which will be described later.

The receiver ■ plays the role of an interference detector, and before emitting radio waves from the transmitter, it checks whether a mobile phone P using the wireless channel is nearby and will not cause interference. used for.

Three inputs are applied to the transmitter. One is the voice signal of the other party, and the other is the control signal from the control unit CPU and the high-speed signal 2400b passed through the encoder from the control unit CPU.
ps, and these are converted into radio signals by modulation at the transmitter, added to the transmitting antenna, and transmitted to the mobile phone P.

(i) Radio system control equipment (RCE) The radio system control equipment (RCE) is a one-on-one communication between the fixed radio station (FR3) that covers the radio wave zone of the location of the mobile phone (P location) and the mobile phone P location. This is a device that connects the PBX extension line of a corresponding switching device when making/receiving a call to form a communication path. The radio system control device RCE consists of communication paths of PCM switches and is connected by a microprocessor.

A block diagram of the radio system control device RCE is shown in FIG. In FIG. 4, the location registration from the mobile phone PTBL and the fixed radio station FR3 that notified it are linked and stored in the storage unit MEM. When there is an incoming call from the PBX extension of the switching equipment, all fixed wireless stations under the FR
3, sends an incoming call signal to which the ID of the called mobile phone IP device is added. Upon receiving this, the fixed wireless station FR3 searches its own memory (RAM), and as a result, the called mobile phone P
If the ID of the mobile phone P is selected, the fixed radio station FR3 calls the mobile phone P. Then, a communication path between the exchange PBX extension and the fixed radio station FR3 is connected.

In the case of a call from mobile phone P, the call is received via fixed radio station FR3, and the call is sent to the extension of the switching device PBX that corresponds to the mobile phone P. Then, the communication path between the extension of the switching device PBX and the fixed radio station FR3 is connected. When the fixed radio station FR3 that is currently on the line sends a call termination notification, the call path is disconnected.

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

a) One-to-one connection between the extension of the PBX switching device and the mobile phone P location
Manage the correspondence between.

b) The location registration from the mobile phone P is linked and stored with the fixed wireless station FR3 through which it passed.

C) When receiving a call from the extension of the switching device PBX, select the vacant fixed radio station FR3 to be connected, and connect the two.

d) When making a call from mobile phone P, determine the extension of the exchange PBX to be connected, and connect the two.

e) Dial from the P position of the mobile phone during a call.

The hooking signal is transmitted to the extension of the switching equipment PBX.

f) When the mobile phone P moves to another radio wave zone during a call, the mobile phone P is reconnected to the fixed radio station FR3 there.

g) When a call is notified from fixed wireless station FR3 during a call,
Disconnect the communication path. The extension of the related switching device PBX, the fixed radio station FR3, and the mobile phone P are made vacant.

The radio system control device RCE described above, the fixed radio station FR3,
The system operation that comprehensively operates the mobile phone P station will be explained.

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

The system is divided into two sections: a wired section between the radio system controller RCE and the fixed radio station FR3, and a radio section between the fixed radio station FR3 and the mobile phone P and 10.

When there is an incoming call, the radio system control device RCE notifies the fixed radio station FR3 of this.

When receiving a line setting request from the fixed radio station FR3, the designated line is connected in accordance with the request.

Communication is relayed from one fixed radio station FR3 to another fixed radio station FR3.

When receiving incoming call information from the radio system control device RCE or when receiving a call request from the mobile phone P unit, the wireless line is set, but the selection of the wireless line at this time is made by the mobile phone P unit. .

In the location registration, the mobile phone P checks the fixed wireless station FR3 that can use its own service, directly or indirectly reports the result to the fixed wireless station FR3, and registers itself.

Furthermore, the call lines are set in the order of wireless line and then wired line.

Therefore, when a call occurs, the fixed radio station FR3 is first selected by the mobile phone P and a radio line is set up.

The fixed radio station FR3 selected as a result instructs the radio system control device RCH to connect to an external line and complete the setting of the call line.

As described above, control is decentralized by making the mobile phone P the center of decision-making in location registration and line setting operation registration when making and receiving calls.

Distributed control reduces the load on the radio system control device RCE, and at the same time, the time required for setting up the line can be shortened because the radio line can be set up in the minimum distance between the fixed radio station FR3 and the mobile phone P and 10.

Furthermore, instead of being limited to one wireless channel for control (more precisely, one channel per wireless zone) as in conventional systems, multiple channels can be used simultaneously for different purposes such as location registration, 9 making calls, 9 receiving calls, etc. did. For example, control channel a (Pc-ch
(abbreviated as ) is the location registration channel, and the notification 9 described below is the location registration channel.
Perform location registration and location registration deletion. On the other hand, the control channel b (abbreviated as Pc-Ch) is used as an incoming/outgoing call control channel, and causes the incoming call 9 outgoing call zone to be switched. Although it is possible to allocate separate channels to the outgoing and two incoming calls, the following explanation will be based on the case where they are allotted to one channel. The reason for using multiple control radio channels as described above is as follows.

■ Processing capacity is significantly increased compared to the case of one.

Simply thinking about this, if you use two, you can expect double the processing capacity, and if you use three, you can expect the processing capacity to be tripled, but as described in (■), the signal format can be unified, and the signal traffic will be reduced. Since efficiency can be improved, higher processing capacity can be expected.

■The format of the signal related to location registration 9 calls is shown in Figure 5 (C), (d), (e), (f), (k).
, (1), they are different from each other, and therefore, if transmission and reception are performed using one control channel, there will be a gap between one signal and another signal, which is inefficient.

On the other hand, efficiency can be expected to improve if the number of formats is reduced to - or even if it is not reduced to one, the number of types is reduced.

■For example, when transmitting a location registration signal from a certain mobile phone, device registration signals composed of other nearby mobile phones are monitored in advance, and the timing is synchronized with the transmission timing transmitted from a fixed wireless station. By transmitting the signals, it is possible to prevent signal collisions, eliminate radio wave emission, reduce interference, and make effective use of frequencies.

■2400 bps for location registration, 1200 bps for making and receiving calls
It becomes possible to set control signal speeds such as ps separately for each type of system operation, and it becomes possible to set signal reliability and traffic density to optimal values for each system, making it easier to design.

As a result of ■■-■, the system operates quickly and wasteful connection delay time is reduced.

In addition, the control signal speed for wireless line control is set to 2400.
By increasing the speed to 100 bps and using a 100 baud out-of-band control signal in the call state, it is possible to further reduce the line setup time and the time occupied by the control channel. .

Insect bait [If a call failure occurs, first place the mobile phone P and the fixed wireless station F.
Control is performed to set up a wireless link between R3, but
In order to efficiently handle the mobile phone locations that move freely within the service area, the fixed wireless station FR5 always keeps track of the mobile phone locations within its own service area (zone). However, in the case of a mobile phone 4iP, it is also necessary to always know the fixed wireless stations FR3 located within its own service area (zone). For this purpose, location registration is performed.

In order to smoothly register the location from the mobile phone P location,
Figure 5 (a) [
Two types of notification signals are sent out.

■Notification signal 1 Announcement signal for the purpose of notifying only the mobile phone P location ■Notification signal 2 Notification signal fixed for the purpose of notifying the mobile phone P location as well as transmitting incoming call information including incoming call information The following three modes are set for the broadcast mode of radio station FR3. (See Figure 6) (1) Quiet mode In this mode, only Pc-ch and Cc-ch are monitored.

(2) Announcement mode 1 When in this mode, on the PC-ch, if incoming call information is generated, announcement signal 2 is generated, otherwise, announcement signal 1 is sent for 20 seconds at intervals of 4 seconds ±α. Send intermittently.

(3) Announcement mode 2 When in this mode, on the PC-ch, if incoming call information is generated, announcement signal 2 is generated, otherwise, announcement signal 1 is output for 10 minutes at intervals of 4 seconds ±α. Send intermittently.

Location registration is performed by interaction between fixed radio station FR3 and mobile phone P for each zone as follows.

Basically, the fixed radio station FR3 needs to perform notification (sending out control signals) while the mobile phone P station is within its own service area. If it is determined that the system is not operating, it stops the notification and enters a static mode.

The decision to make this mode transition is made independently in each fixed radio station FR3 as follows: 'F? deceive

Fixed radio station FR3 needs to determine whether or not mobile phone P is within its service area when the power is turned on and when the state transitions from call state 2 incoming call state to standby state a. .

Therefore, notification mode 1 is entered unconditionally.

If no notification request signal or location registration request signal is received from the mobile phone P during the notification mode I, the stationary mode is entered after the notification mode I ends.

During the notification mode 1, if a notification request signal or a location registration request signal is received from the mobile phone P, it is determined that the mobile phone P is in the area, and the notification mode 2 is entered from that time.

When the fixed radio station FR3 is in the stationary mode and incoming call information is generated, it enters the broadcast mode l from that time.

Also, when in stationary mode, if a notification request signal or a location registration request signal (these are sent on control channel a dedicated to location registration) is received from the mobile phone P, the mobile phone P is in the area. It is determined that there is, and the system enters notification mode 2 from that time.

If no notification request signal or location registration request signal is received from the mobile phone P station during the notification mode 2 period, it is determined that the mobile phone P station is not within the area, and notification mode 2 is terminated. .

At this time, if incoming call information occurs during the period of notification mode 2 and 20 seconds or more have elapsed since the occurrence, the stationary mode is entered.

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

FIG. 6 shows a fixed radio station FR3 broadcast mode transition diagram.

Next, location registration control of fixed radio station FR3 will be explained.

When fixed radio station FR3 receives a location registration request signal from mobile phone P while in broadcast mode (1, 2) or stationary mode, if it contains its own SID, , performs location registration processing on the PID included in the signal, and transmits a location registration response signal to the mobile phone P.

The location registration process involves creating a "PID registration table" (Table 1) in its own memory (storage unit in Figure 2), registering the PID included in the signal there, and controlling the wireless system. This is notified by sending a location registration request command to the device RCH.

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 is a maximum of 180 times/10 seconds (30 minutes). Furthermore, the in-area state is set to the in-area unknown state when an incoming call occurs and the incoming call is subsequently abandoned, and when a notification of an incoming call timer error is received from the radio system control device RCE. Furthermore, if the location of the mobile phone P is confirmed, such as by receiving a signal from the mobile phone P whose location is unknown, it is determined that the mobile phone is in the area.

Table 1 Next, a description will be given of the distance between fixed radio station FR3 and Wataru.

When a location registration deletion request signal is received from the mobile phone P, the fixed wireless station FR3 specified by the signal (fixed wireless station FR3 whose location registration is to be deleted) is specified only if its own SID is included in the signal. ), the radio system control device RCE notifies this and also sends a notification to the mobile phone P.
A location registration deletion response signal is sent to the location.

The fixed wireless station FR3 that has received the notification deletes the corresponding PID from its own "PID registration table".

FIG. 7 shows a flowchart of the location registration operation.

Next, location registration control viewed from the mobile phone P location will be explained.

The mobile phone P receives the broadcast signal from the fixed wireless station FR5, checks the field strength, and if it is above a certain value, determines that its own service is possible and registers its location with the fixed wireless station FR3. At the same time, the fixed radio station FR3 whose location has been registered is registered in its own internal table shown in Table 1.

Therefore, in order to notify the mobile phone of its own presence and prompt the transmission of a notification signal, the mobile phone P transmits a notification request signal to the fixed radio station FR3 when the power is turned on and when it transitions from the talking state to the standby state.

Also, for example, 10 seconds after the notification from the fixed wireless station FR3 can no longer be detected (permissible time for no notification detection = 4 seconds x 2,
5: Transmit a notification request signal after the notification period has elapsed.

Furthermore, in addition to this, even when receiving a notification from the fixed radio station FR3, if the reception level is below a certain value and the notification is received a specified number of times, a notification request is transmitted from the mobile phone P.

When mobile phone P moves to a new wireless zone due to movement and receives a broadcast signal from fixed wireless station FR3 installed there, it registers its own internal "SID registration" for the SID included in the signal. Search the table'' (storage section in FIG. 2).

As a result, if the SID has been registered, the "° electric field strength" and "registration timer" associated with the SID are updated. If not registered, the SID included in the signal
Location registration processing is performed for the fixed wireless station FR3 corresponding to .

As the location registration process, a location registration request signal is transmitted, and the station waits to receive a location registration response signal from the fixed wireless station FR3. After that, if a location registration response signal is received within the specified waiting time, the "SID" will be added to the "SID registration table".
Register the electric field strength and the registration timer.

If the location registration response signal is not received, the location registration request signal is retransmitted. If it is not received even after retransmitting a specified number of times, it is determined that the location registration has failed and is not registered in the "SID registration table".

Finally, location registration control in the radio system control device RCE will be explained.

The radio system control device RCE does not have a direct judgment function regarding location registration control, and only manages result information regarding location registration notified from the fixed radio station FR3. For management, a "PID-3ID all ID-bull" (MEM in FIG. 4) is generated within the radio system control device RCE, and registration or deletion is performed based on information notified from the fixed radio station FR3.

There are two types of information notified by the fixed radio station FR3: ``location registration information'' and ``location registration deletion information,'' and they are notified by a ``location registration request command'' and a ``location registration deletion command,'' respectively.

Furthermore, the radio system control device RCE relays the "Location Registration Deletion Command" to the specified or all fixed radio stations FR3 based on the iW indication included in the command.

FIG. 11 is a flowchart showing an example of location registration operation.
This is a different representation of what corresponds to the figure.

(ii) When receiving an incoming call from the exchange PBX, the incoming radio system control device RCE performs incoming control for the call. When performing incoming call control, the “incoming P
ID registration table" (MEM in FIG. 4) is generated and incoming call control is performed.

Radio system control equipment RCE incoming call settings and connections are performed in the following order.

(2) At the time of incoming call, the radio system control device RCE registers the incoming PID in the "incoming PID registration table" and then sends the incoming call start execution instruction G command to all fixed heat wA stations FR3.

Upon receiving this instruction, the fixed radio station (FR3) transmits an incoming call signal to the called mobile phone using the incoming control channel. On the other hand, if a nearby mobile phone receives this message, IDTJ1! After confirming this, it searches for an empty channel for communication, and if it finds one, it sends a wireless line connection request signal specifying that channel to the fixed wireless station FR3 (
(See Figure 8(a)).

■One fixed wireless station FR3 that successfully connected to a wireless line
When receiving a call setting request command, a call setting completion notification G command is sent to all fixed radio stations FR3 to notify that the destination of the call has been determined.

At the same time, register the incoming PID in the SID for which -i ( in the "SID status table" was set) to set the incoming call mode.

■When receiving an incoming call response request command from fixed wireless station FR3, refer to the "'SID status table" and
After confirming that the ID is in incoming call mode, connect the line between the fixed wireless station FR5 and the switching equipment PBX, and
Change the mode and register the relevant SID on the "ID status table" to call mode, and delete the relevant PID from the "incoming PID registration table."

This ends the incoming call processing.

Incoming call control for fixed radio station FR3 is performed in the following order.

When receiving the incoming call start execution instruction G command from the radio system control device RCE, the
If the PID is registered in "All ID-Blue", the system enters an external call state and performs the following external call process.

(2) The Cc-ch performs a process of transmitting an incoming call signal to the PID specified by the incoming call start execution instruction G command, and waits to receive an incoming call response signal from the mobile phone P.

After that, an incoming call response signal is received from the mobile phone P,
If the own SID is included in the destination SID of the signal, wireless line connection processing is performed under the initiative of the mobile phone P.

■When the wireless line setting is completed and the R tightening line connection request signal is received from the mobile phone P, the wireless system control device RCH
It sends an incoming call setting request command to, and notifies all fixed radio stations FR3 of this via the radio system control device RCE.

(2) The fixed radio station FR3 transmits a ring tone signal to the mobile phone P in order to cause the mobile phone P to generate a ring tone. after that,
When receiving a line connection request signal addressed to itself from the mobile phone P, it sends an incoming call response request command to the radio control device RCE and transitions to a talking state.

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

Next, the dish line dish line 1u section will be explained.

Fixed radio station FR3 performs carrier detection for uplink and downlink of Cc-ch. As a result, when it is confirmed that the mobile phone is vacant, an incoming call signal is transmitted to the mobile phone P. After completing the incoming call signal transmission, for example, the mobile phone IP
Wait for a response from the location.

If there is no response from the mobile phone P during this time, after α seconds have passed after the standby ends, the incoming call signal is sent (retransmitted) again and the mobile phone enters the standby for 1 second. (α is the fixed wireless station F
It is determined by random timing that is independently set for each R3. ) If there is no response from the mobile phone P during this period, the wireless line connection will fail.

The signal elements of the incoming signal are as shown in FIG. 5(e).

The empty communication channel is information for one channel of 5-ch, which has been previously detected as empty by the fixed radio station FR3.

Transmission of a missed call response signal from the mobile phone P in response to this will be explained.

The mobile phone P receives, on Cc-ch, one of the incoming signals received within a maximum of one second from the time it completes receiving the first incoming signal addressed to it from the fixed wireless station FR3.
Select one from the criteria shown below.

(2) The designated 5-ch information in the incoming call signal is compared with the 5-ch information that has been previously detected as empty on the mobile phone P side, and an incoming signal with matching information is determined.

(2) Select the signal with the highest signal reception field strength and the best quality from among the incoming signals whose empty 5-ch information matches.

At this time, if there is no signal with the received field strength of the above level, the fixed wireless station FR3 that showed the remaining reception quality
Select the signal received first from O.

(2) If selection cannot be made according to (2) or (2), select from among the signals that do not satisfy the condition 1) according to (2).

An incoming call response signal containing the SID selected above is returned to the fixed radio station FR3.

Communication channel acquisition is performed as follows.

(2) When the fixed radio station FR3 receives an incoming call response signal addressed to itself from the mobile phone P, it sequentially performs empty detection for the three designated 5-chs. Sky 5-
When the channel is detected, a channel switching completion signal is continuously transmitted for about 0.5 seconds to the mobile phone 41P. During this time, a wireless line connection request signal from the mobile phone P must be received.

If channel 5-5 is not vacant and if continuous transmission of channel switching completion signals for about 0.5 seconds is completed, the wireless line connection will fail.

(2) The mobile phone P sequentially searches the specified 5-ch and waits for a channel switching completion signal from the fixed radio station FR3. When receiving the channel switching completion signal, it transmits a wireless line connection request signal to the fixed wireless station FR3.

When the mobile phone P cannot receive the channel switching completion signal from the fixed radio station FR3, the mobile phone P performs call return response processing. If this fails, the mobile phone P places the wireless line connection failure 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. 5(g) and 5(h).

When the fixed wireless station FR3 receives a wireless line connection request signal from the mobile phone P, it sends an incoming call setting request command to the wireless system control device RCE, and connects the wireless system to all fixed wireless stations FRS. In addition to notifying this via the control device RCE, the fixed wireless station FR3 continuously transmits a ringing tone signal to the mobile phone P connected to the wireless line. The mobile phone P rings the incoming call signal while receiving this.

After this, when there is an operation by the caller on the side of the mobile phone P, a high call signal is transmitted to the fixed radio station FR3 and the mobile phone P enters a call state. When fixed radio station FR3 receives this,
It sends an incoming call response request command to the radio system control device RCE and enters into a talking state.

The signal elements of the incoming ringing signal and the call loud signal are shown in Figure 5 (i) U.
) is as follows.

FIG. 12(a) is a flow diagram showing an example of the operation of receiving a call.

(i) When a calling request occurs, the calling mobile phone P performs calling processing and connects a wireless line with the fixed wireless station FR3.

After the fixed radio station FR3 completes the wireless line connection with the mobile phone P, it sends a call request command to the radio system control device RCE to set up a call line.

In the case of the first outgoing call process, outgoing calls are made to three fixed wireless stations F out of the fixed wireless stations FR3 registered in the SID registration table (MEM in Figure 2) inside the mobile phone P.
R3 is selected and transmission control is performed for it.

In addition, in the case of re-transmission processing, unspecified fixed radio station FR3 (
Transmission processing is performed for all fixed wireless stations FR3 that are in a standby state.

The transmission operation will be explained in detail below.

When a call request occurs, the mobile phone P location is Cc-ch.
Carrier detection is performed on the downlink (control channel). As a result, when it is confirmed that the space is vacant, the “
For example, a maximum of three SIDs with good conditions are selected from among the 5 IDOs registered in the ``SID registration table'', and an outgoing signal as shown in Fig. 5 (b) is sent to these IDs exclusively for outgoing calls (in this embodiment, only for outgoing and incoming calls). ) control channel 6, which is the control channel for
Transmit on Cc-ch.

The transmission signal is continuously transmitted for a maximum of one second, and during that time a response from the fixed radio station FR3 is awaited. If there is no response from the fixed radio station FR3, the normal transmission has failed and retransmission processing begins after 1+α seconds have elapsed. Here, α is determined by random timing that is independently set for each fixed radio station FR3.

5IDa=c... Sort by destination SID in descending order of condition. This sequence becomes timing information to which the fixed wireless station FR3 responds.

chaxc: Idle call channel information. The mobile phone P side arranges in advance the 5-ch (call channels) using the empty detection method in descending order of confirmation time.

FIG. 7 shows a state transition diagram in this case.

When the fixed radio station FR3 receives an outgoing signal from the mobile phone P and its own SID is included as the destination SID, the fixed radio station FR3 sequentially transmits the outgoing signal for the 5-ch specified in the signal. search for. As a result, when an empty 5-ch is detected, the 5-ch with the latest i recognition time within that 5-chO is
The outgoing response signal shown in Figure 5 (1) carrying ah is sent to the mobile phone P at the timing specified by the destination SID sequence.
send to the location.

When mobile phone P receives a call response signal from fixed radio station FR3, it selects a signal that satisfies the following conditions from among them.

■ Regarding the empty 5-ch information specified in the outgoing response signal, the 5-ch that has been previously detected as empty on the mobile phone P side
Compare the information and find out which signals have matching information.

■Select the signal with the highest received signal field strength from among the outgoing responses whose empty 5-ch information matches.At this time, L
If there is no signal with a received field strength of 4 (this is the value when the received field strength is divided into 5 levels, and the field strength becomes weaker as the value becomes smaller), first from the remaining L3. Select the received signal.

If it is not possible to select according to ■■ and ■, select according to ■ from among the signals that do not satisfy the conditions of ■.

When the mobile phone P detects the call response signal as described above, it transmits a fixed radio station FR3 designation signal to the fixed radio station FR3 that transmitted the signal. After this, both the fixed radio station FR3 and the mobile phone P device start to acquire a communication channel.

Communication channel acquisition is performed as follows.

(2) When the fixed radio station FR3 receives the above fixed radio station FR3 designation signal from the mobile phone P, the fixed radio station FR3 sequentially performs empty detection for the three designated 5-channels in accordance with this signal. When the empty 5-ch is detected, a channel switching completion signal is continuously transmitted for about 0.5 seconds to the mobile phone P.

(2) The mobile phone P sequentially searches the specified 5-ch and waits for a channel switching completion signal from the fixed radio station FR3. When receiving the channel switching completion signal, it transmits a line connection request signal to the fixed radio station FR3.

When the fixed radio station FR3 receives a line connection request signal from the mobile phone P, the fixed radio station FR3 performs a wireless system control function? &RCE,
and sends out an outgoing connection request command, and also notifies all fixed radio stations FR3 of this via the radio system control device RCE.

The mobile phone mP enters the talking state from the time the transmission of the line connection request signal is completed.

FIG. 9 and FIG. 12(b) are flowcharts showing an example of the calling operation.

6ψ zone switching Zone switching will be explained below.

When a call occurs, the 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 mobile phone P position cannot be moved. Or, the state of the wireless line changes due to the movement of obstacles (including people) around the line.

For this reason, the status of the wireless line is managed by mutually monitoring the received field strength between the mobile phone P and the fixed wireless station FR3, and radio line management such as zone switching processing and out-of-service processing is performed as necessary. Processing and transmission of control signals during calls are performed outside the voice band (to prevent interference with calls).
Svo-ch).

When the mobile phone P moves during a call and the distance between it and the fixed radio station FR3 with which it is communicating increases and the call quality deteriorates, zone switching is performed.

The mobile phone P position has the received field strength of fixed wireless station FR3,
Or, when the received field strength at the own fixed radio station FR3 falls below a certain value due to the terminal confirmation signal from the fixed radio station FR3, the terminal confirmation signal from the fixed radio station FR3 as shown in Fig. 5 (b)
) is used to send a monitor request signal such as

When the fixed radio station FR3 receives the same signal from the mobile phone 41P, it sends a monitor request command to the radio system control device RCH. As a result, all the fixed radio stations FR3 in standby state will receive the specified 5-
Monitors channels.

From now on, for convenience, the fixed wireless station FR3 that is currently being called will be referred to as ``Fixed wireless station FR3s'', or the fixed wireless station FR5 as the switching destination will be referred to as ``Fixed wireless station FR3s''.
Fixed radio station FR3d".

(2) The zone switching request P unit continuously transmits zone switching signals after transmitting the monitor request signal. The zone switching request signal is transmitted in 5vo-cb and has the signal elements shown in FIG. 5(n).

P, -3-ch information; 5-ch information that has been empty-searched in advance on the mobile phone P side; pzQ information; currently used line quality information. Also, when Q≦11 is satisfied in this state, thin switching processing 2 is performed. enter.

■Fixed wireless station FR3, which is currently monitoring zone switching request response, is monitoring destination 5vo-Ch.
When a zone switching request signal is received under the following conditions, the device enters the zone switching state from the standby state.

・Zone switching request signal reception conditions (zone switching request signal reception electric field strength)> (Q information specified in the signal) The fixed wireless station FR3 that has entered the zone switching response state checks the 5-ch information included in the signal. Search sequentially, and if a vacant 5-ah is detected, the 5-ch information is used, and if the vacant 5-ah is detected, the 5-ch information for which the vacant 5-ah has been detected on the fixed radio station FR3 side is added. The zone switching response signal as shown in Figure (0) is continuously transmitted on Cc-ch after detecting the sky above and below Cc-ch, and the monitored 5vo-ch waits for reception of the FR3 designation signal from the mobile phone P. .

■If the designated mobile phone P of fixed wireless station FR3 receives a zone switching response signal on Cc-ch under the following conditions, the 5vo-
Instead of the zone switching request signal that is being continuously transmitted on the channel, an FR3 designation signal to which 5-ch information selected as follows is added is continuously transmitted.

After this, both the fixed radio station FR3 and the mobile phone P device enter switching processing.

- Zone switching acceptance signal reception conditions (zone switching acceptance signal reception field strength information)> (Currently used line quality Q) S12 (1/1 choice jd student is as follows.

1) If the 5-ch information included in the zone switching acceptance signal matches the empty 5-ch information that you have already searched, then
-ch information 2) If l) is not satisfied, empty detection is performed for the 5-ch, and if empty is confirmed, the Sch information 3) If 2) and 1) are not satisfied, the mobile phone P A new empty channel was detected on the side, and the 5-
Acquisition of channel information switching destination 5-ch is performed as follows.

■Fixed wireless station FR3d has a monitor channel of 5vo-
When a FRS designation signal addressed to the self as shown in Figure 5 (b) is received on a channel under the following conditions, the 5-ch designated by the signal is
Performs sky detection.

- FR3 designated signal reception conditions (FR3 designated signal received electric field strength) ≧ (Q information designated by the signal) If the sky detection result of 5-ch is confirmed to be empty, the same channel as shown in Figure 5 (q) Continuous transmission of channel switching completion signals such as

In addition, when 5-ch is not free, when continuous transmission of channel switching completion signals is completed for the specified time (maximum transmission time of channel switching completion signals), and when it becomes impossible to receive fixed radio station FR3 designated signals. returns to standby state. (The monitor request is not canceled.) ■The mobile phone P position is 5-c specified as the FR3 designated signal.
h, and waits for a self-directed channel switching completion signal from the fixed wireless station FR3d.

When a channel switching completion signal is received under the following conditions, a line link request signal as shown in FIG. 5(r) is continuously transmitted in place of the FR3 designation signal that is being continuously transmitted on the 5vo-ch currently in use.

・Channel switching completion signal reception conditions (Channel switching completion signal reception electric field strength)> (Current line quality Q) The mobile phone P starts transmitting the FR5 designated signal continuously, and then waits for a specified period of time (FI?S designated If the channel switching completion signal from the fixed radio station FR3 cannot be received on the designated destination S-ch even after the maximum signal transmission time has elapsed, the fixed radio station FR3 acquisition will fail and a zone switching request will be made again.

■Line link Fixed wireless station FR3d is on 5vo-ch during monitoring.
When a line link request signal from the mobile phone P is received under the following conditions, a connection request command is sent to the radio system control device RCH.

・Line link request signal reception condition (Line link request signal received electric field strength) ≧ (Currently used line Q) After that, fixed radio station FR3d switches the switching channel when it receives a connection completion notification command from the radio system controller RCE. Continuous transmission of terminal confirmation signals will begin on 5vo-ch.

Further, if the connection completion notification command is not received from the radio system control device RCE within a specified time after sending the connection request command, the device returns to the standby state. (The monitor request is not canceled.) ■The switched mobile phone P receives the terminal confirmation signal from the fixed wireless station FR3d on the switching destination 5vo-ch, and receives its own electric field information and fixed wireless information included in the signal. The line quality Q determined from the received field strength of station FR3d is (line quality Q of mobile phone P and fixed wireless station FR3d) ≧
(P fixed radio station FR3s line quality Q) If the following is satisfied, the call line is switched from the fixed radio station FR3s to the fixed radio station FR3d.

After switching the call line, the mobile phone P is set to 5vo-ch.
, the continuous transmission of terminal confirmation signals begins.

When the fixed radio station FR3d receives a terminal confirmation signal from the mobile phone P, it sends a status setting request command to the radio system control device RCE, and also sends a status setting request command to the radio system control device RCE.
The CE outputs a switching completion notification G to all fixed wireless stations FR3.

When the fixed radio station FR3s receives the above notification from the radio system control device RCE, it cancels the radio line and transmits the radio system control device R.
Sends a disconnection request command to the CE and returns to standby state.

Further, when the other fixed radio station FR3 receives the above notification, it releases the monitoring of the mobile phone P location.

FIG. 10 shows an example of the zone switching process l.

Finally, the termination of the calling/receiving operation, which remains in the system description of this embodiment, will be explained.

■ End of call on mobile phone Pr When "hang up" is operated on mobile phone P during a call, or when the call is ended as a result of out-of-service processing (see out-of-service processing), call end processing begins.

At this time, no matter what state the mobile phone P is in, it continuously transmits a call termination signal for a specified period of time on the 5 VO-AH call line currently in use, and returns to the transmission completion standby state.

■Fixed radio station FR3 terminates the call Fixed wireless station FR3 terminates the call when it receives a call end signal from the mobile phone P during a call, performs out-of-service processing, and ends the call as a result (see out-of-service processing). Start processing.

At this time, no matter what state the fixed radio station FR3 is in,
Continuously transmits a call termination signal for a specified period of time on 5vo-ch of the call line currently in use, and sends a call termination request command to the radio system control device RCE.
This notification is sent to all fixed wireless stations FR8 via E.

Furthermore, all fixed radio stations FR3 cancel all processing related to calls with the mobile phone P.

■Radio system control device rlcE call termination The radio system control device RCE receives the call termination request command from the fixed radio station FR3, cancels all processing related to the call with the fixed radio station FR3, and at the same time cancels the call with the switching device PBX.
sends a call end signal to. The PBX exchange receives this signal and, if connected from an outside line, transmits a call termination signal to the exchange.

The above description has been made of the case where the present invention is applied to a large-scale high-rise building, but it is clear that the present invention can be applied to cases where the service area is not only within the building but also within the premises, as well as in urban areas and residential areas. be.

(5) As described in detail, by applying the system construction according to the present invention to a small zone method using micro cells,
It is possible to make and receive calls between a mobile phone and other mobile phones or fixed-line phones located anywhere within the service area, which not only improves the reliability and quality of communication, but also enables effective use of frequencies. Therefore, the effect on improving the convenience of communication is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram showing one embodiment of the present invention;
FIG. 3 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 wireless station used in the present invention, and FIG. 4 is a block diagram showing an example of a wireless system control device used in the present invention. Block diagrams, Figures 5(a) to (r) are diagrams showing different formats of signals used in the present invention, Figure 6 is a diagram showing an example of state transition of a fixed wireless station used in the present invention, and Figure 7 is a diagram of the present invention. FIG. 8(a) Φ) is a flow diagram showing an example of the operation of a location registration request in the present invention; FIG. 9 is a flow diagram showing an example of the operation of a call in the present invention; FIG. FIG. 10 is a flowchart showing an example of the operation of zone switching processing in the present invention, FIG. 11 is a flowchart showing FIG. 7 in a different representation, and FIG. FIG. 12 (C) is a flow diagram showing FIG. 9 in a different form. Patent applicant: Iwasaki Tsushinki Co., Ltd. Tokyo Electric Power Company, Inc.

Claims (1)

[Claims] (1) Each fixed wireless station that covers a plurality of zones and constitutes a service area; A plurality of mobile phones that exist within the service area and can communicate with the fixed wireless station; and each of the fixed wireless stations. A wireless station is connected to a general telephone network, identification information of the mobile phone and at least one fixed wireless station that can communicate well with the mobile phone is registered, and the mobile phone is connected to the mobile phone via the registered fixed wireless station. A mobile communication system including a wireless control device for making and receiving calls to a telephone, wherein the mobile telephone registers a location in one of the plurality of zones;
A mobile communication device characterized in that the mobile communication device is configured to mutually transmit control information to and from a fixed wireless station using at least one different wireless channel when initiating an operation for making a call or responding to an incoming call. system.