JPH02155318A - Mobile body communication system - Google Patents

Abstract

PURPOSE:To constitute a system capable of accommodating many subscribers with high frequency utilizing rate and high service performance by providing the center judgement of such events as location registration of a portable telephone set and at the time of outgoing and incoming calls. CONSTITUTION:A portable telephone set(PTEL) has a function applying-access to a ratio system controller RCE via a fixed radio station (FRS), applying automatic position registration, and accessing the radio system controller RCE to vary the location registration when the necessity of location registration to other fixed radio station takes place. In the radio section, the portable telephone set PTEL is a master and the fixed radio station FRS is a slave and the control is decentralized by providing the center of discrimination at the line setting operation registration at an incoming and outgoing call to the portable telephone set PTEL. Since the load of the radio system controller RCE is relieved by the decentralized control and the radio line is set by a minimum section between the fixed radio station FRS and the portable telephone set PTEL, the line setting time is reduced.

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 The present invention relates to a communication method and system that satisfies the communication quality when the communication quality deteriorates due to the movement of a mobile terminal. More specifically, the present invention relates to a communication method and system that is excellent in frequency effective utilization rate 9, communication quality, wireless line control ability, etc.

(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 TT's car telephone system [Reference: Yoshiyuki et al. “Car telephone radio line control °.

Nippon Telegraph and Telephone Telecommunications Research Institute Research and Practical Application Report Vol.

26, Nα7, page 1885].

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.

■In order to improve usability, for example, it is necessary to lengthen the battery charging cycle, and for this reason the wireless transmitter's speed (5 watts) must be increased.
It is necessary to save power, including from t to about 101).

■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.

A system proposal (draft) that does not meet 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", Institute of Electronics and Communication Engineers. Technical 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 light as a cordless phone. However, the transmission power is about 10 mW.

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

(2) Equidistributing the system control so that each mobile phone takes the lead [Phase] A single set of transmitter/receiver, ie, a 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 system - Proposal of multiple location registration and application to system operation - Institute of Electronics, Information and Communication Engineers Technical Research Report RC38B September 1986] Using this proposal, the following problems can be solved. I was forced to do so.

■In a small zone system that uses small zones (microcells) with a radius of 25 to 100 m, the service area per radio base frequency is extremely narrow, and the distance between the transmitting antenna and the receiving antenna is short, resulting in short-range radio wave propagation characteristics. It is an area that follows the above, and has 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 comparing call traffic congestion, and the number of calls per person is reduced.

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

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

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

(4) Explanation of the structure and operation of the invention Figure 1 shows the present invention in large-scale high-rise buildings B3 (3rd floor underground) to 2
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, a switching device PBX has an ink face 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 radio system control device (radio system control device RC).
E) It consists of 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 in the service area, anytime, anywhere.

However, the above-mentioned service content is between mobile phones PTE L and between mobile phones P and in-building landline telephone FT E L.
It is possible to perform the process between each other, or even between a mobile phone and a phone 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. Each component used in the configuration of the present invention shown in FIG. 1 will be explained in detail below.

(il mobile phone (r’ position) 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 by the shared device and input to receivers I and H, respectively. In reception II, the signal is amplified to the required level, 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 SWI 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 has a storage unit, a speaker, a keyboard, and an interface, and each has the functions indicated by the name.

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

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

That is, a control signal obtained from the output of receiver I or H by switch SW3 in synchronization with turning switch SW1 to ■ or ■ so that the audio signal of either receiver I or H is input to the receiver. is selected and input to the decoder.

Similarly, switch SW2 determines which receiver I or {circle around (2)} is used in conjunction with the transmitter. Further, the synthesizer (1) or (2) receives a command signal for a wireless channel to be generated from the control unit CP tJ, generates a local oscillation output of a desired frequency, and supplies it to the receiver I or (2) and the transmitter. An output for measuring electric field strength is supplied from the receiver I 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 inputs are applied to the transmitter. One is the transmitter output, and the other is the control signal from the control unit CPU. This is a high-speed signal of 2400 bps that has passed through the encoder from the 11th section.

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 PTEI- is received by a receiving antenna.

This received signal is divided into three parts by the shared equipment, and the equipment receiver 1.
II and ■ are input. In receiver I, the signal is amplified to a required level, demodulated, and divided into three parts. One of them is sent to the control unit CPU via the decoder (240
0 bps control signal), and the other is a 200 bps control signal sent to the control unit CPU via switch SW.
Switch SW.

This signal is sent to the FRS/RCE interface via the FRS/RCE interface. Control unit CI) U has a storage unit and an interface.

Next, the signal input to the receiver H is also shown in Fig. 3 (
It has the same wiring configuration as receiver I.

The switches SW and SW1□ are driven by a switch driving section under the control of the control section CPU.

That is, in synchronization with the switch SW + z being turned down to ■ or ■ so that either the reception 61 or H audio signal is input to the FR3/RCE interface, the switch SW,... Input low speed side j
'JH signal (200 bps) is selected.

Similarly, the switch SW, 2 determines which receiver I or 2 is to be used in conjunction with the transmitter. Also synthesizer I, II
Or (2) receives a command signal for a wireless channel to be generated by the control unit CPU, generates a local oscillation output of a desired frequency, and supplies it to the receivers (2), (2) and (3) and 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 transmitter output, and the other is the control signal from the control unit CPU and the control unit CP.
A high-speed signal of 2400 bps passes through the encoder from U, and these are converted into radio signals by modulation at the transmitter, added to the transmitting antenna, and transmitted to the mobile phone P.

(ii) Radio system control equipment (RCE) The radio system control equipment (RCE) is a fixed radio station (FR3) that covers the radio wave zone where the mobile phone (P location) is located, and the mobile phone P'F Mito1. This is a device that connects the PBX extension line of a switching device, which has a one-to-one correspondence, at the time of outgoing/incoming calls 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 4iP and the fixed radio station FRS 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 FR3
An incoming call signal to which the ID of the called mobile phone P is added is transmitted. The fixed radio station FR3 that receives this detects the memory circuit (RAM) in its own mobile phone device, and if the ID of the called mobile phone P is selected as a result, the fixed radio station FR3 detects the mobile phone. Call the P location. 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, a communication path between the extension of the switching device PBX and the fixed radio station FR5 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 the mobile phone PTEL, determine the extension of the switching equipment PBX to be connected, and connect the two parties.

e) Dial from a mobile phone PTEI during a call.

The funking 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 provide its own service, directly or indirectly notifies the fixed wireless station FR3 of the result, 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 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 RCE 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 device.

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. .

When a ``phantom'' call occurs, first connect 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 FR3 always keeps track of the mobile phone locations within its own service area (zone). Similarly, the mobile phone P needs to always know which fixed radio stations FR3 are 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 as shown in b) 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 Ccch are monitored.

(2) Notification mode 1 When in this mode, the PC-ah sends notification signal 2 if incoming call information is occurring, and notification signal 1 if not, 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 sent for 10 seconds 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.

This determination for mode transition is made independently in each fixed radio station FR3 as follows.

When the fixed radio station FR3 is powered on and when the state transitions from the call state 1 incoming call state to the standby state, it is necessary to determine whether or not the mobile phone P is located within its own service area.

Therefore, notification mode 1 is entered unconditionally.

If a notification request signal from the mobile phone PTEI or a location registration request signal is not received during notification mode 1, after notification mode 1 ends, the stationary mode is entered.

If a notification request signal or a location registration request signal is received from the mobile phone P while in notification mode 1, it is determined that the mobile phone P T E L is in the area, and from that time on, notification mode 2 is activated. enter.

When the fixed radio station FR3 is in the stationary mode and incoming call information is generated, it enters the broadcast mode 1 from that time.

Further, when in the stationary mode, 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 within the area, and the notification mode 2 is entered 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 registering the PID in the wireless system. This is notified by sending a location registration request command to the control device RCE.

Table 1 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.

Next, we will explain the rule for fixed radio station FR3.

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 received the notification uses its own II PID.
Delete the corresponding PID on the registration table.

FIG. 7 shows the flow of location registration operations.

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 FR3, 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 its presence and prompt it to send a notification signal, the mobile phone P transmits a notification request signal to the fixed wireless station FR3 when the power is turned on and when it transitions from the call state to the standby state. do.

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 above a certain value and the notification is received a specified number of times, a notification request is transmitted from the mobile phone P.

The mobile phone P T E L moves to a new wireless zone and connects to the fixed wireless station FR3 installed there.
When a notification signal is received from
For the ID, search the internal ``SIDSID status table storage section''.

As a result, if the SID has been registered, the "field strength" and "registration timer" associated with the SID are updated. If it is unregistered, location registration processing is performed for the fixed radio station FR3 corresponding to the SID included in the signal.

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".
This is registered for ``field strength'' and ``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 assumed that the location registration has failed and the registration in the "5IDI record table" is not performed.

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 registration table" (MEM in Figure 4) is generated in the radio system control device RCE, and fixed radio station F RS
Register or cancel your registration based on the information notified by .

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

In addition, the radio system control device RC relays the "location registration deletion command" to a specific or all fixed radio stations FR3 according to instructions included in the command.

(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, an "incoming PID registration table" (MEM in FIG. 4) is created inside the wireless side fall devices R and CE to perform incoming call control.

The incoming call setting and connection of the radio system controller RCE is performed in the following order.

(2) At the time of incoming call, the radio system control unit 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 radio stations FR3.

■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, the incoming PID is registered in the SID for which the incoming call setting has been made in the "SID status table", and the incoming call mode is set.

■When receiving an incoming call response request command from fixed wireless station FR3, refer to the “SID status table” and
After confirming that D is in incoming call mode, fixed wireless station F
At the same time as connecting the line between R3 and the switching device PBX,
Change the mode and register the corresponding sID in the "D status table"-F to the call mode, and delete the corresponding 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 wireless system control bag wRcE, the 'P I
If the PID is registered in "D registration table",
It enters the outer layer transmission state and performs the following outer layer transmission processing.

(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 a wireless line connection request signal is received from the mobile phone PT'EL, an incoming call setting request command is sent to the wireless system control device RCH, and all communication is completed via the wireless system control device RCE. The fixed radio station FR3 is notified of this fact.

(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 RCH and transitions to a talking state.

This completes the outer layer transmission process. FIG. 8 shows a state transition diagram in this case.

Next, I will explain about Saraindan Alliance Bamboo Support.

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 transmission of the incoming call signal, for example, the mobile phone P
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 time, the wireless line connection will fail.

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

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, from among the incoming signals received within a maximum of 1 second from the time it completes receiving the first incoming signal from the fixed wireless station FR3 addressed to itself.
Select one from the criteria shown below.

(2) The specified 5-ch information in the incoming 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 checked.

(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 using (2) or (2), select one of 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 to the mobile phone P for about 0.5 seconds. 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 Pr sequentially searches the designated 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.

If the mobile phone P cannot receive the channel switching completion signal from the fixed wireless station FR3, the mobile phone JiP 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 FIG. 5 (eHf).

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 FR3. The fixed radio station FR5 notifies the controller RCE of this fact, and also continuously transmits a ringing tone signal to the mobile phone P connected to the radio line. The mobile phone P rings the incoming call signal while receiving this.

After this, when the mobile phone device side performs an operation by the caller, it transmits a high call signal to the fixed radio station FR5 and enters into a call state. When fixed radio station FR8 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 (g) (
C).

(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 normal outgoing processing, outgoing calling is performed using three fixed wireless stations FR3 among the fixed wireless stations FR3 registered in the SID registration table °' (MEM in Figure 2) inside the mobile phone P.
3 is selected and transmission control is performed for this.

In addition, in the case of re-transmission processing, unspecified fixed radio station FR3 (
Transmission processing is performed for all fixed wireless stations FR5 that are in a standby state.

The transmission operation will be explained in detail below.

When a call request occurs, the mobile phone P is connected to CC-ch.
Carrier detection is performed on the downlink (control channel). As a result, when it is confirmed that the space is vacant, the “
Among the SIDs registered in the SID registration table,
For example, a maximum of three SIDs with good conditions are selected, and a transmission signal as shown in FIG. 5(i) is transmitted to them on the 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 FR5 is awaited. If there is no response from the fixed radio station FR3, the normal transmission has failed, and retransmission processing begins after 10 α seconds have elapsed. Here, α is determined by random timing that is independently set for each fixed radio station FR3.

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

cha=c...Using empty call channel information, the mobile phone PTBL side arranges the 5-ch (call channels) using the empty detection method in advance in descending order of confirmation time.

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

When the fixed radio station FR5 receives an outgoing signal from the mobile phone P and its own SID is included as the destination SID, the fixed radio station FR5 sequentially transmits the outgoing signal for the 5-ch specified in the signal. search for. As a result, if an empty 5-ch is detected, the 5-ch with the latest confirmation time is selected.
The outgoing response signal shown in FIG. 5(j) carrying channel 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.

(2) 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, the remaining L
Select the signal received first from 3.

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 Schs in accordance with this signal. When the empty 5-ah is detected, a channel switching completion signal is continuously transmitted to the mobile phone P for about 0.5 seconds.

(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, it sends an outgoing connection request command to the radio system control device RCE, and connects all fixed radios via the radio system control device RcE. The station FR3 is notified of this fact.

The mobile phone P enters the talking state from the time it completes sending the line connection request signal.

Gv) Zone switching Zone switching will be explained below.

A call is generated, the outgoing or incoming call processing is executed, and after completion, the call state is entered. During a call, it is possible to send dial signals to the line and send and receive voice signals, but the state of the wireless line may change due to movement of the mobile phone P or movement of obstacles (including people) around the line. changes occur.

Therefore, the state of the wireless line is determined by the mobile phone PT[l.

The L-fixed radio station FR3 mutually monitors and manages the received field strength, and performs radio line management processing such as zone switching processing and out-of-service processing as necessary. Furthermore, control signals during a call are transmitted using a channel outside the voice band (SVO-ch) in order not to interfere with the call.

When the mobile phone P T E L moves during a call and the distance w1 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 fixed radio station FR3 drops below a certain value due to a terminal confirmation signal from the fixed radio station FR3, a fifth concave signal is sent to the fixed radio station FR3)
A monitor request signal such as the following is sent.

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

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 switching destination fixed wireless station FR3 will be referred to as "fixed wireless station FR3s."
``Fixed radio station F RS d''.

■Zone switching request P T E L continuously transmits zone switching signals after transmitting the monitor request signal. The zone switching request signal is 5vo-
It is transmitted at eh and has the signal elements shown in FIG. 5(ff).

P, -5-ch information: S channel information that has been empty searched in advance on the mobile phone P side PzQ information; Line quality information currently in use Also, when Q≦11 is satisfied in this state, zone switching processing 2 is entered. .

■Fixed wireless station FR5, which is currently monitoring zone switching request response, is monitoring destination Sνo-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 FR8 that has entered the zone switching response state checks the 5-ch information included in the signal. Search sequentially, and if an empty 5-ch is detected, use that 5-ch information, or if empty detection fails, search for the 5-ch with empty 5-ch information added on the fixed radio station FR3 side. A zone switching response signal as shown in FIG.

The mobile phone waits for reception of the FR3 designation signal from the mobile phone P on channel.

■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-
In place of the zone switching request signal that is being continuously transmitted on channel, an FRS 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 (fence) [Choice 1 is as follows.

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

■Fixed wireless station FR3d has a monitor channel of 5vo-
When an FR3 designation signal addressed to the self as shown in Figure 5(n) is received on a channel under the following conditions, the 5-ch designated by the signal is
Performs sky detection.

・FR3 designated signal reception condition (FR3 designated signal reception electric field strength) ≧ (Q information designated by the signal) If the sky of S-ch is confirmed as a result of sky detection, the same channel will receive the signal shown in Fig. 5 (0). Continuous transmission of channel switching completion signals such as

In addition, when 5-eh is not free, when continuous transmission of channel switching completion signals for the specified time (maximum transmission time of channel switching completion signals) is completed, and when it becomes impossible to receive the fixed radio station FR3 designated signal. returns to standby state. (The monitor request is not canceled.) ■The mobile phone P position is the S-
ch, 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(P) is continuously transmitted in place of the FR3 designation signal that is being continuously transmitted on the Svo-ch currently in use.

・Channel switching completion signal reception conditions (Channel switching completion signal reception electric field strength)> (currently used line quality Q) Mobile phone If the channel switching completion signal from the fixed radio station FR3 cannot be received on the designated destination S-ch even after the transmission time (transmission time) has elapsed, the acquisition of the fixed radio station FR3 will fail and a zone switching request will be made again.

■Line link Fixed radio station FR3d is on Svo-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 the terminal TI multiplication signal from the mobile phone P, it sends a status setting request command to the radio system controller RCE, and all fixed radio stations via the radio system controller RCE. A switching completion notification G is sent to FR3.

When the fixed radio station FR3s receives the above notification via 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.

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

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

■Cell phone device end call If the "hang up call" button is operated on the mobile phone P during a call, or if the call is ended as a result of out-of-service processing (see out-of-service processing), call end processing is entered.

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 5vo-ch of the call line currently in use, and returns to the transmission completion standby state.

■Fixed radio station FR3 call termination If fixed radio station FR3 receives a call termination signal from a mobile phone PTEl- during a call, or if it performs out-of-service processing and the call is terminated as a result (see out-of-service processing), the call is terminated. Start processing.

At this time, no matter what state the fixed radio station FR3 is in,
On 5vo-Ch of the call line currently in use, a call termination signal is continuously transmitted for a specified period of time, and a call termination request command is sent to the radio system control device RCE.
This notification is sent to all fixed wireless stations FR3 using the E route.

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

■Radio system control device RCE 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 FR5, 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 inside the building but also within the premises, 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 communications, 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. The block diagram, Fig. 5(a) to (P) shows the signal format used in the present invention, Fig. 6 is a diagram showing an example of state transition of a fixed wireless station used in the present invention, and Fig. 7 shows the present invention. FIG. 8 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.
The figure is a flow diagram showing an example of the operation of zone switching processing in the present invention. Patent applicant: Iwasaki Tsushinki Co., Ltd. Tokyo Electric Power Company, Inc.

Claims (3)

[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 above. A fixed 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 radio control device for making and receiving calls to a mobile phone, the mobile phone including self-identification information by radio waves of a predetermined wireless channel when the mobile phone starts operating in one of the plurality of zones. The fixed wireless station that transmits a location registration signal and receives this radio wave intermittently transmits radio waves on the predetermined radio channel that transmits a notification signal including identification information according to a certain rule, and when the mobile phone moves, If the notification signal cannot be received, location registration information including self-identification information is sent to surrounding fixed wireless stations again so that the same operation as at the start of the operation is performed, and the fixed wireless station that receives this A communication system for a mobile body, characterized in that a station is configured to transmit a notification signal similar to that described above. (2) 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 wireless base means. In a mobile communication system that includes a wireless control device for making and receiving calls to a telephone, when a call is received to one mobile phone within a service area, the wireless control device calls all the fixed-line devices under its control. An incoming call signal is sent to the wireless station with identification information of the mobile phone attached, and the fixed wireless device that receives this signal searches a self-memory circuit and stores the identification information of the mobile phone. When the mobile phone transmits an incoming call signal with the identification information and the identification information of the fixed wireless station added to the mobile phone, the mobile phone that receives the call signal refers to the identification information of the fixed wireless polarity. It is configured to enable incoming calls by comparing the communication quality of incoming call signals from other fixed wireless stations and automatically selecting a good one as the fixed wireless station with which to communicate. A mobile communication system characterized by: (3) Each fixed wireless station that covers a plurality of zones and constitutes a service area, a mobile phone that exists within the service area and can communicate with the fixed wireless station, and each fixed wireless station and a general telephone network, register identification information of the mobile phone and at least one of the fixed wireless stations that can communicate well with the mobile phone, and connect the mobile phone to the mobile phone via the registered wireless base means. In a mobile communication system that includes a wireless control device for making and receiving calls, when a mobile phone within a service area makes a call, multiple fixed wireless stations stored in the own mobile phone as a result of the above registration are sent to the mobile phone. A calling signal containing identification information is sent out, and the nearest fixed wireless station that receives this compares the mobile phone's self-identification information included in the signal with the information stored in its own memory and finds a match. When the mobile phone receives the response signal, it compares the communication quality with response signals from other fixed wireless stations, automatically selects the one with good quality, and communicates with the other fixed wireless station. What is claimed is: 1. A mobile communication system characterized in that the mobile communication system is configured to make it possible to make calls by establishing a station as a station.