JP2902420B2 - Mobile communication system - Google Patents

Abstract

PURPOSE:To attain an incoming/outgoing call between a portable telephone set resident in an optional location in a service area and other portable tele phone set or between fixed telephone sets by adopting a small zone system using a micro cell for the title system. CONSTITUTION:A portable telephone set PTEL has a function accessing a radio system controller RCE via a fixed radio station FRS in a radio wave and applying automatic position registration. Each portable telephone set has its own identification information ID different from other portable telephone sets. The fixed radio station FRS demodulates a digital outgoing signal from the radio system controller RCE, converts the signal into a radio modulation wave, which is sent to the portable telephone set PTEL. On the other hand, the fixed radio station FRS receives and demodulates an incoming signal from the portable telephone set PTEL, converts the signal into a digital signal and transmits it to the radio system controller RCE.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field to which the Invention pertains The present invention relates to mobile communication using a small zone configuration.
The present invention relates to a communication method and system that always secures incoming and outgoing calls with a mobile terminal from an arbitrary location in a service area, and satisfies the communication quality when the communication quality deteriorates due to the moving mobile terminal during communication. More specifically, the present invention relates to a communication system having excellent frequency effective utilization rate, communication quality, radio line control capability, and the like.

(2) Conventional technology and its problems In general, when performing mobile communication within a wide service area, a system in which one wireless base station covers the entire area and communicates with the mobile within the service area. Is called the large zone method. On the other hand, the small zone method divides a service area into a plurality of small areas, installs one radio base station in each of the divided areas, and sets a mobile radio in each of the divided areas. Communicates with these wireless base stations.

The conventional small zone method is, for example,
This is used in NTT's mobile telephone system [Ref. Yoshikawa et al., "Automobile Radio Network Control", Nippon Telegraph and Telephone Research Institute of Telecommunications Research and Application Vol.26, No.7, p. 1885].

First, as a method of processing an incoming call to a mobile station moving anywhere in the service area, a method of simultaneously calling only in a mobile station location area known in advance is used.

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

Next, when the mobile station makes a call, an outgoing control channel available in the control zone where the mobile station is located is used. In this case, the number of the outgoing control channel is always broadcast on the incoming control channel, so the mobile station stores this,
A channel with an empty display (empty line control method) is used. As described above, the base station receives radio waves from the mobile device at a plurality of wireless base stations, and as a result, identifies the wireless zone where the mobile device is located (position detection) and uses an empty communication channel that can be used in the wireless zone. Can be called by specifying.

Further, the incoming call will be described. The mobile station is waiting on the incoming control channel. When the mobile station moves to another control zone, it is necessary to switch to the incoming control channel used for the new control zone. For this reason, the mobile station has a function of selectively capturing a channel received at a required level or higher from a plurality of channels allocated for incoming call control when the reception level of the incoming control channel falls below a required value. Identifies the control zone.

Therefore, when an incoming call comes from a fixed telephone network to a certain mobile device,
In the mobile telephone exchange, a desired mobile base station will be called if all the radio base stations in the control zone (there is a plurality of zones) whose location is registered make a general call.

The above is an outline of a practical system. However, when a system described below is constructed, various problems occur.

In order to increase the number of subscribers (portable telephones) accommodated in the system by at least one digit compared to the conventional system and to increase the number by 10 to several millions, the zone radius must be reduced by at least one digit. In this case, if the radio line control is centrally managed as described above, ultra-high-speed control is impossible due to congestion of control traffic due to the generation of a large number of control signals and the absolute delay time generated in signal transmission from the radio base station to the radio line control station. Becomes

It can be used not only in a car but also when a person walks out of the car. This is the first step toward the realization of a system that allows the ultimate telephone to be called "anytime, anywhere, anywhere." However, it is necessary to reduce the size of the mobile radio.

For example, it is necessary to lengthen the charging cycle of the battery in order to improve the usability. Therefore, it is necessary to reduce the power of the wireless transmitter (from 5 W to about 10 mW) and to save power.

It is necessary to increase the use efficiency of the used frequency as much as possible.
This is a major premise for realizing a system capable of accommodating a subscriber having a large capacity of several millions.

One system proposal (trial plan) that meets such requirements
Has already been proposed by the present inventor [Reference. Ito, "Study of Cellular Phone System-Focusing on Radio Link Control and Routing-" IEICE Technical Report CS87-16 May 1987].

 According to this proposal, the following conditions are provided.

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

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

It can be as small and light as a cordless phone. However, the transmission power is about 10 mw.

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

The control is decentralized, for example, the system control is led by each mobile phone.

The wireless transmission / reception capability of the mobile phone parent device is 1
A pair of transceivers or one wireless channel is sufficient.

In addition to the multi-channel access capability, the transceiver of the item has a radio channel control capability, that is, a control channel use capability, and a radio channel communication capability, that is, a call channel use capability.

In addition, the following document proposes a position registration of a mobile phone, which is a problem in a system adopting a minimum zone method such as a radius of 25 m as described above.

[Literature Ito "Study of Mobile Phone System-Proposal of Multiple Location Registration and Application to System Operation-IEICE Technical Report RCS88 September 1988" Using this proposal, the following problems can be solved: is what happened.

In a small zone system using a small and small zone (micro cell) with a radius of 25 to 100 m, the service area per radio base station is extremely narrow, and the distance between the transmitting antenna and the receiving antenna is short, so that it follows the short-range radio wave propagation characteristics. It becomes an area and has a complicated appearance due to the influence of topography and features. In the service area in such a state,
When location registration is performed from a mobile body, signals from the mobile radio can be received by a large number of radio base stations, and it is difficult to determine in which area the radio is located. We decided to register the location for the base station.
As a result, outgoing / incoming calls became easier.

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

Effective use of frequency (radio waves) is achieved.

It becomes easier to take countermeasures at the time of call traffic congestion, and call loss is reduced.

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

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

To solve this problem, the inventor of the present invention uses the fact that each mobile phone has self-identification information (abbreviated as ID) to identify that it is different from other mobile phones, so that the mobile phone can transmit and receive in a high-density traffic area. It has been proposed that the call be divided into groups (groups) in order to make calls smoothly (see Japanese Patent Application No. 1-192649). For example, when the ID is represented in decimal notation, the system is divided into two groups depending on whether the last digit is odd or even or an ID divisible by "3", and the remainder is "1" when divided by "3"
Some of them are divided into three groups, the remainder being "2". This method solves the above-mentioned problem of not being able to respond immediately to a call, but systematically with a small probability, if mobile phones belonging to the same group are concentrated in the same place, signal collision occurs and the call is made. There was a possibility that the call could not be performed smoothly.

In addition, a plurality of transceivers are installed in the same place as a fixed wireless configuration in which a large number of people can talk simultaneously with a plurality of fixed wireless stations in the same place, and these are used as a common control unit. A method has also been proposed in which fixed wireless station transmission during standby is controlled to only one station at the same time by a signal from the PC (see Japanese Patent Application No. 1-183632). The receiving units of the n sets of transceivers (n fixed wireless stations) are in a standby state for receiving signals from the mobile phone, while the transmitting unit transmits the synthesizer output under the control of the plurality of fixed wireless station control units. This is a method in which a notification signal, an incoming call signal, or a response signal to a mobile phone can be immediately transmitted when added to a unit. Further, in order to prevent the above three types of signals from being simultaneously transmitted from the plurality of fixed wireless stations to the mobile phone, the plurality of fixed wireless station control units apply the synthesizer output to only one fixed wireless station to the transmitting unit at the same time. This is a method of performing control by turning on and off a switch circuit.

Although this method is certainly effective, it requires a control station to control multiple fixed wireless stations, and it may be slightly more expensive economically.If this control station becomes an obstacle, all fixed wireless stations can not make or receive calls There is a risk of becoming.

Further, a method has been considered in which a broadcast signal transmitted from a fixed wireless station as described later is transmitted before confirming that it is not transmitted from a nearby fixed wireless station (referred to as carrier sense) before transmitting (referred to as carrier sense). No. 1-43043).
This method is certainly effective, but when the number of fixed wireless stations in the vicinity becomes large, for example, 10 or more, carrier sensing must be performed many times, and two or more fixed wireless stations broadcast simultaneously. As a result, the probability of sending a signal increases,
The possibility of signal collision increases, and smooth outgoing / incoming calls cannot be performed.

(3) Object of the Invention It is an object of the present invention to provide a mobile communication system using a microcell which has a high frequency utilization rate, can accommodate a large-capacity subscriber, and has a high call traffic density based on the above conventional technology. An object of the present invention is to provide a mobile communication system capable of constructing a system having high serviceability that enables smooth processing of a large number of calls even in an area.

(4) Structure and operation of the present invention FIG. 1 shows the present invention for a large-scale high-rise building B3 (3 basement floors) to 21
This is an example of a case where the present invention is applied to a system having a service area within F (21 floors above ground).

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

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

However, the above service contents can be executed between the mobile telephone PTEL, between the mobile telephone PTEL and the fixed telephone PTEL in the building, and between the mobile telephone and the telephone installed on the outside line (more than the private branch exchange). is there.

As described above, the feature of the present invention is that the center of the judgment at the time of the outgoing / incoming call operation, such as the location registration of the mobile phone, is provided not in the center of the radio system controller but in the terminal as in the conventional system. As a result, the load on the central radio control unit is reduced, and the work speed is increased.
In addition, this makes it possible to easily cope with the addition of terminals and the expansion of the system.

In addition, when using a wireless channel for transmitting and receiving control signals used for calling and receiving when registering the location of a mobile phone, it is necessary to use each channel in order to make effective use of frequencies and improve quality during signal transmission. The wireless channels are individually set to enable optimal design as a wireless system.

Hereinafter, each component used in the configuration of the present invention shown in FIG. 1 will be described in detail.

(I) Mobile phone (PTEL) This is a device that is carried by a person, and must be excellent in portability, operability, and maintainability. Fixed radio station (FR
It has a function to access the radio system controller RCE via S) and automatically perform location registration. Also, when a person moves to a place following walking and it becomes necessary to register a position to another fixed wireless station, the wireless system control device performs the same operation as described above.
It has a function to access the RCE and change the location registration.
Incoming and outgoing calls can be made from any location within the service area. Therefore, each mobile phone has its own identification information (abbreviated as ID) to identify that it is different from other mobile phones. If it is necessary to change (zone switch) the fixed radio station FRS that is communicating with the other person while walking during a call, this has had an adverse effect such as being impossible with a conventional system or temporarily cutting off call information. However, according to the present invention, a system free of these adverse effects is possible as described later.

 FIG. 2 shows a hardware configuration of the mobile phone PTEL.

In FIG. 2, a radio signal transmitted from a fixed radio station FRS is received by a receiving antenna. This received signal is bisected by the shared device and input to the receivers I and II, respectively. Is part demodulated after being amplified to a receiver I in the required level is sent to the control unit CPU (control signal 200 bps), one of which is input to the switch SW ₁ as handset other output bisected The other is the control unit CP after passing through the decoder
Input to U (2400 bps control signal). The control unit CPU has a storage unit, a switch, a keyboard, and an interface, and each has a function indicated by a name.

Next, the signal input to the receiver II has the same connection configuration as that of the receiver I as shown in FIG. Switches SW ₁ and SW ₂ are driven by the control of the control unit CPU via the switch driver. That is, the receiver I or any of the audio signal II is in synchronism with beat switch SW ₁ to be input to the receiver or the receiver by a switch SW ₃ I or I
The control signal obtained at the output of I is selected and input to the decoder.

Similarly the switch SW ₂ determines the receiver I or II are used in conjunction with the transmitter. Further, the synthesizer I or II receives a command signal for a radio channel to be generated from the control unit CPU, generates a local oscillation output of a desired frequency, and supplies it to the receiver I or II and the transmitter. An output for measuring electric field strength is supplied from the receiver I or II to the control unit CPU. This is used at the time of zone switching of the mobile phone PTEL described later.

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

The control unit CPU shown in FIG. 2 has a built-in timer unit (not shown). The timer unit stops emitting radio waves at a certain timing, receives a signal transmitted from the fixed wireless station FRS, or receives a signal from the fixed wireless station FRS. Provides timing determination information regarding reception stop and the like.

(Ii) Fixed radio station (FRS) Demodulates a digital downlink signal from the radio system controller RCE (in the direction from the radio system controller RCE to the mobile phone PTEL), converts it into a radio modulated wave, and transmits it to the mobile phone PTEL. .
On the other hand, it receives and demodulates an upstream signal from the mobile phone PTEL (from the mobile phone PTEL to the radio system controller RCE), converts the signal into a digital signal, and transmits the digital signal to the radio system controller RCE.

Each fixed wireless station installed in a service area where normal call traffic occurs has a set of transceivers equipped with self-identification information (abbreviated as SID) to identify that it is different from other fixed wireless stations. ). On the other hand, in a service area with high call traffic, if the above fixed radio station is installed, the call with the mobile phone may not be performed smoothly. A method of providing a transceiver is adopted.
Hereinafter, the functions of these fixed wireless stations will be described in order of a fixed wireless station having only one set of transceivers, and then a fixed wireless station having a plurality of sets of transceivers.

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

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

Next, the signal input to the receiver II has the same connection configuration as that of the receiver I as shown in FIG.

Switch SW ₁₁ and SW ₁₂ are driven by the switch driving unit under the control of the control unit CPU. That is, slow or audio signal of the switch in the SW ₁₃ receiver I or II is synchronized to that brought down or as input to FRS / RCE interface, which is input to the control unit CPU in the switch SW ₁₁ The control signal (200 bps) is selected.

Similarly the switch SW ₁₂ determines the receiver I or II for use in conjunction with the transmitter. Also synthesizer I, II or III
Receives a command signal for a wireless channel to be generated by the control unit CPU, generates a local output of a desired frequency, and
Supply to I, II and III and transmitter. This is used at the time of zone switching of a portable telephone PTEL described later. Receiver III serves as an interference detector, and checks whether a mobile phone PTEL using the wireless channel is nearby and does not cause interference before the transmitter emits radio waves. used.

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 2400 bps passed through the encoder from the control unit CPU.These signals are converted to radio signals by modulation at the transmitter. To the transmitting antenna and transmitted to the mobile phone PTEL.

The control unit CPU shown in FIG. 3 has a built-in timer unit (not shown), which changes the mode of the broadcast signal transmitted by the fixed radio station (FRS) at a certain timing, Provides timing determination information regarding the stop of the launch of the vehicle.

The above is a case where one fixed wireless station has only one set of transceivers. Hereinafter, a fixed wireless station having a plurality of sets will be described. This fixed wireless station is referred to as a multiple fixed wireless station, and is abbreviated as a multiple FRS. In a fixed wireless station capable of coping with a high-density traffic area, the concept of zone-based location registration is introduced into a service zone managed by the fixed wireless station. With the introduction of this concept, zones can be distinguished from each other in the case of a plurality of FRSs for control, if any representative FRS among them is referred to as a master FRS (a slave of another FRS), the self-identification information of the master FRS (SID). However, the relationship between the master and the slave is not stationary but changes every moment. That is, when the master FRC starts communication with a certain mobile phone, the FRS in the slave state is changed to the master.

For example, (a normal this master FRS when powered on) four sets of transceivers FRS ₁ to a plurality of FRS, FRS _2, FRS
₃ and FRS ₄ , and the respective self-identification information is SIDa, SIDb, SIDc, and SIDd, and the self-identification information representing the multiplexed FRS is the master FRS at that time.
Is given by SIDa which is the self-identification information of the FRS ₁ in the state. Moreover, even if the master FRS enters the call and another slave FRS is changed to the master, the SIDZ (SIDa) once registered is unchanged.

Generally speaking, the self-identification information of the service zone of the multiplexed FRS is represented by S1DZ as the self-identification information of the master FRS owned by the multiplexed FRS, and the location registration control by this is performed in SIDZ units. The location registration management inside the RCE will be performed in SIDZ units. However, when the master FRS is in a communication state with the mobile phone, the method of shifting the slave FRS to the master FRS can be performed by a method of managing the order of younger numbers.

Hereinafter, the fact that the above operation can be specifically executed will be described with reference to FIG.

FIG. 14 is a configuration diagram of a complicated FRS, in which n radio base station units 1, 2,..., N are installed on the left side, and between these and the right main unit are shown. Are connected by a bus line and a signal line. The main unit has a function to control a plurality of left base stations in common.
Determine the "common RAM circuit (CRAM)" and its access rights. It comprises a "CRAM access right determination circuit" and a chain control circuit for chain-connecting the control rights of the units.

 Hereinafter, each of the configurations in FIG. 14 will be described.

First, the CRAM will be described. The CRAM is for data saving shared by the units to be mounted, and the data mainly includes location registration information, incoming call information, and the like. What is noteworthy in terms of the hardware configuration is that this CRAM is a mere storage circuit, and does not include any complicated functions such as a CPU or a signal transmission circuit as in a general control circuit. Therefore, the circuit can be regarded as a passive circuit equivalently, so that it is economical with few obstacles.

Next, the CRAM access right determination circuit issues an access request from the unit to the CRAM access right determination circuit,
A handshake method is adopted in which the CRAM access right determination circuit issues access permission to the request unit. Also,
When access requests are issued from a plurality of units almost simultaneously, only one unit specified by the access right determination circuit becomes the access circuit.

Further, when a call (including incoming / outgoing call, location registration control) is generated, the chain control circuit performs selection control to cause only one of the plurality of units in the standby state to respond to the call.

And prioritize each mounted unit,
Further, a status signal indicating the status of the unit (waiting / talking) output from each unit is input, one of the units in the waiting state is selected, and the right to answer the call is given.

Also, when all of the mounted units are in a call state, they also have a function of selecting a unit having a higher priority among them.

Table 1 shows a method of selecting 3ch FRS units as an example.
If there is a unit that is not mounted, this state is apparently set to a call state, so that it is possible to respond according to Table 1.

The hardware configuration of the CRAM access right determination circuit and the chain control circuit described above can be regarded as a passive circuit which is almost the same as a simple logic switch circuit like the CRAM circuit, and is economical with few failures.

Further, the radio base station unit has all the control functions and transmission / reception functions as one FRS in terms of system and the FRS shown in FIG.
It has a function to output its own status to the chain control circuit in the main body. The output in this state is a binary value of a standby state / a call state.

Although the hardware configuration of the combined FRS has been described above, the control of outgoing / incoming between the mobile phone and the fixed wireless station is the same as in the case of a normal fixed wireless station in the multiple FRS as described later. Self-identification information (SI
D) Possible in units.

(Iii) Radio system controller (RCE) The radio system controller (RCE) is a one-to-one correspondence between a fixed radio station (FRS) that covers the radio zone of the location of the mobile phone (PTEL) and the mobile phone PTEL. Equipment PB
This is a device that connects to the X extension when making / receiving calls and forms a communication path. The radio system controller RCE comprises a communication path of a PCM switch and is connected by a microprocessor.

FIG. 4 shows a block diagram of the radio system controller RCE. In FIG. 4, the location registration from the mobile phone PTEL and the fixed radio station FRC that has notified the location registration are linked and stored in the storage unit MEM. Extension telephone FTEL of exchange PBX
When there is an incoming call from, all subordinate fixed radio stations FRS
, And transmits an incoming call signal to which the ID of the called mobile phone PTEL is added. The fixed radio station FRS receiving this searches its own storage unit (RAM), and as a result, if the ID of the called mobile phone PTEL is selected, the self-fixed radio station FRS sends the ID of the mobile phone PTE.
Call L. And the switching equipment PBX extension and the fixed radio station FRS
Connect the call path between and.

In the case of a call from the mobile phone PTEL, the call is accepted via the fixed wireless station FRS, and the call is transmitted to the extension telephone FTEL of the switching device PBX corresponding to the mobile phone PTEL. Then, a communication path between the extension of the exchange PBX and the fixed wireless station FRS is connected. If the call is notified from the fixed radio station FRS during the call, the call path is disconnected.

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

a) Managing the one-to-one correspondence between the extension telephone FTEL of the exchange device PBX and the mobile telephone PTEL.

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

c) When an incoming call is received from the extension telephone FTEL of the exchange device PBX, an available fixed radio station FRS to be connected is selected, and both are connected by incoming call.

d) Switching equipment to be connected when calling from mobile phone PTEL
Decide the extension of PBX and connect both sides.

e) The dialing and hooking signals from the mobile telephone PTEL during a call are transmitted to the extension telephone FTEL of the exchange PBX.

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

g) If there is a call end notification from the fixed radio station FRS during the call, the call path is disconnected. The extension telephone FTEL, the fixed wireless station FRS and the mobile telephone PTEL of the associated switching device PBX are vacated.

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

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

The system is divided into two sections, a wired section between the radio system controller RCE and the fixed wireless station FRS, and a wireless section between the fixed wireless station FRS and the mobile phone PTEL.

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

-When a line setting request is received from the fixed wireless station FRS, the specified line is connected according to the request.

Relays communication from one fixed wireless station FRS to another fixed wireless station FRS.

In the wireless section, mobile phone PTEL is the main, fixed wireless station FRS
When receiving incoming information from the radio system controller RCE or receiving a call request from the mobile phone PTEL, the radio line is set. Performed by the mobile phone PTEL.

For location registration, the mobile phone PTEL checks its own fixed radio station FRS that can be serviced, and notifies the fixed radio station FRS directly or indirectly of the result and registers itself.

The setting of the telephone line is set in the order of the wireless line and then the wired line.

Therefore, when a call is generated, first, the fixed wireless station FRS is selected by the portable telephone PTEL, and the setting of the wireless line is performed.

As a result, the fixed radio station FRS selected is designated as the radio network controller RCE and connected to an external line to complete the setting of the communication line.

As described above, the control of the mobile phone PTEL is decentralized by giving the center of the determination in the line setting operation registration at the time of outgoing / incoming call including the location registration.

The load of the radio system controller RCE is reduced by the distributed control, and the setting of the radio channel can be performed in the minimum section between the fixed radio station FRS and the mobile phone PTEL, so that the line setting time can be reduced.

In addition, one wireless channel for control is used as in the conventional system (exactly one for one wireless zone).
Without limitation, multiple devices can be used at the same time for each purpose such as location registration, outgoing call and incoming call. For example, the control channel a (abbreviated as Pc-ch) is a location registration channel, and performs notification, location registration, and location registration deletion described below. On the other hand, the control channel b (abbreviated as Cc-ch) is an outgoing / incoming / outgoing control channel, and the incoming / outgoing zone is switched. Although it is possible to assign different channels to outgoing calls and incoming calls, respectively, the following description will be made on the case where one channel is assigned. The reasons for using a plurality of control wireless channels as described above are as follows.

The processing capacity is greatly increased as compared with the case of one. If this is simply considered, the processing capacity can be expected to be doubled if the number is set to two, and tripled if the number is set to three. However, as described further, the signal format can be unified, and the signal traffic efficiency can be improved. Since the improvement can be achieved, further processing ability can be expected.

The formats of signals related to location registration and outgoing / incoming calls are shown in FIGS. 5 (c), (d), (e), (f), (k), (l).
Therefore, as shown in (1), transmission and reception are performed on one control channel, so that an empty space is created between one signal and another signal, resulting in poor efficiency. On the other hand, if only one format is used or the number of types is reduced without using one format, an improvement in capability can be expected.

For example, when transmitting a location registration signal from a certain mobile phone, the location registration signal transmitted from another nearby mobile phone is monitored in advance, and the location registration signal is transmitted in accordance with the transmission timing transmitted from the fixed wireless station. If they are transmitted, it is possible to prevent signal collision, eliminate the emission of radio waves, and reduce interference and effectively use frequencies.

It is possible to set the control signal speed separately for each type of system operation, such as 2400 bps for location registration and 1200 bps for outgoing and incoming calls, and set the signal reliability and traffic density to optimal values for each system And the design becomes easier.

As a result of (-), the system operation becomes quick and the useless connection delay time is reduced.

In addition, the control signal speed for wireless line control is 2400bp
s, and by using an out-of-band control signal of 100 baud during a call, it is possible to further shorten the line setting time and shorten the control channel occupation time. .

Assuming the above configuration and conditions, the operation of the system of the present invention will be described next as (i) location registration relation, (ii) incoming call, (ii)
Hereinafter, i) transmission and (iv) zone switching will be sequentially described.

However, the above operation in the case where a plurality of sets of transceivers are provided in one fixed wireless station will be described last.

(I) Location registration relationship When a call occurs, first the mobile phone PTEL and the fixed radio station
Control is performed to set up a wireless line between FRS,
For the mobile phone PTEL moving arbitrarily in the service area, in order to perform this efficiently, the fixed wireless station FRS always keeps track of the mobile phone PTEL in its service area (zone), Similarly, in the same manner, it is necessary to always know the fixed wireless station FRS located in the service area (zone) of its own. For this purpose, location registration is performed.

FIG. 5 (a) differs depending on the state from the fixed wireless station FRS in order to facilitate location registration from the mobile phone PTEL.
Two types of notification signals as shown in (b) are transmitted.

Notification signal 1 Notification signal for the purpose of notification only to mobile phone PTEL Notification signal 2 Notification signal for the purpose of transmitting incoming information including incoming information together with notification to the mobile phone PTEL Fixed radio station FRS The following three modes are set for the notification mode. (Refer to Fig. 6.) (a) Still mode In this mode, only monitoring of Pc-ch and Cc-ch is performed.

(B) Notification mode 1 When in this mode, the notification signal 2 is output in Pc-ch if incoming information is generated, and the notification signal 1 is output otherwise, for example, at intervals of 4 seconds ± α for 20 seconds. Send intermittently.

(C) Notification mode 2 In this mode, the notification signal 2 is output in Pc-ch if incoming information is generated, and the notification signal 1 is output if not, for example, at intervals of 4 seconds ± α for 10 minutes. Send intermittently.

The location registration is performed by the following interaction between the fixed wireless station FRS and the mobile phone PTEL for each zone.

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

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

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

 Therefore, the system enters the notification mode 1 unconditionally.

If the notification request signal or the position registration request signal from the mobile phone PTEL is not received during the notification mode 1, after the notification mode 1 is ended, the operation enters the stationary mode as shown in FIG.

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

When the incoming call information is generated when the fixed wireless station FRS is in the stationary mode, the broadcast mode 1 is entered at that time.

In the stationary mode, if a notification request signal from the mobile phone PTEL or a location registration signal (these are transmitted on the control channel a dedicated to location registration) is received, it is determined that the mobile phone PTEL is located. Then, it enters the notification mode 2 from that time.

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

At this time, if the incoming information is generated during the notification mode 2 and more than 20 seconds have passed since the generation, the apparatus enters the stationary mode.

After the end of the notification mode 2, if the incoming information is generated during the period of the notification mode 2 and not less than 20 seconds have elapsed since the generation, the process enters the notification mode 1.

Next, the position registration control of the fixed wireless station FRS will be described using the operation flow shown in FIG. When the operation of the fixed wireless station is turned on, transmission of the notification signal 1 is started. This transmission is continued until the timer 1 times out. The fixed wireless station FRS is transmitting the broadcast signal 1 or 2 (the broadcast mode (1,
2)) or when in mobile mode,
If a location registration request signal from TEL is received and its own SID is included, the PID included in the signal
, And transmits a location registration response signal to the mobile phone PTEL.

When this is completed, the transmission of the notification signal 1 is continued as it is. When the above-mentioned signal from the mobile phone PTEL is not received, it waits for the generation of the incoming call information. However, if it does, the notification signal 2 is transmitted and the notification operation is continued. In addition, if the incoming information does not disappear, the operation of the notification signal 2 is continued, and the mobile phone shifts to the stationary mode via the transmission of the notification signal 1 by the end of the notification signal transmission period timer. To receive a notification request signal or the like. If the incoming information disappears among the above, the operation shifts to the operation of the notification signal 1 from this point.

In the location registration process, a “PID registration table” (Table 2) is generated in its own memory (the storage unit in FIG. 3), and the PID included in the signal is registered therein, This is notified by sending a location registration request command to the system controller RCE.

Here, the electric field strength is the received electric field strength of the position registration request signal,
The registration timer starts from the time of registration, up to 180 times /
10 seconds (30 minutes). Furthermore, when the incoming call occurs and the incoming call is later abandoned, and when the notification of the incoming timer error is received from the radio system controller RCE, the existing state is set to the unknown state. In addition, when the location of the mobile phone PTEL is confirmed, such as when a signal from the mobile phone PTEL whose location is unknown is received, it is determined that the mobile phone is located.

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

When a location registration deletion request signal is received from the mobile phone PTEL, the fixed radio station FRS specified by the same signal only when its own SID is included in it (the fixed radio station FRS whose location registration is to be deleted) For the radio system controller R
Via the CE, this is notified and a location registration deletion response signal is transmitted to the mobile phone PTEL.

The fixed radio station FRS that has received the notification deletes the corresponding PID on its own “PID registration table”.

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

Next, position registration control from the perspective of the mobile phone PTEL
This will be described with reference to the flowchart of FIG.

The mobile phone PTEL receives the notification signal from the fixed wireless station FRS, checks its electric field strength, if it is a certain value or more, determines that its own service is possible, and performs position registration with the fixed wireless station FRS. At the same time, the fixed radio station FRS whose location has been registered is registered in its own internal table shown in Table 2.

For this reason, in order to prompt the transmission of a notification signal indicating the presence of the mobile phone, the mobile phone PTEL transmits a notification request signal to the fixed wireless station FRS when the power is turned on and when the mobile phone transitions from the call state to the standby state.

The fixed radio station FRS receives this signal and
Notify the TEL that the notification signal has been received. If the mobile phone receives this signal, it shifts to the SID search operation described below.If it cannot receive the signal, the fixed radio station FRS
For example, a notification request signal is transmitted after elapse of, for example, 10 seconds (notification detection non-permissible time = 4 seconds × 2.5: notification period) after the notification from the server cannot be detected.

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

By the way, when the notification signal is received, the SID included in the signal is stored in its own “SID registration table”.
(The storage unit in FIG. 2).

As a result, if the position of the fixed wireless station FRS that has transmitted the received broadcast signal has been registered, the position registration information (“field strength” and “registration timer”) associated with the SID is updated. In the case of a fixed wireless station that has not been registered but is unregistered, this is because the mobile phone PTEL moves to a new wireless zone due to movement and receives a broadcast signal from the fixed wireless station FRS located there. , Perform a location registration operation.

As the position registration process, a position registration request signal is transmitted,
It waits for reception of a location registration response signal from the fixed wireless station FRS. Thereafter, when a location registration response signal is received within the specified waiting time, the location registration response signal is registered in the “SID registration table” for “SID”, “field strength”, and “registration timer”.

If the location registration response signal has not been received, the location registration request signal is retransmitted. If the data is not received even after the retransmission for the specified number of times, the registration in the “SID registration table” is not performed as a position registration failure.

By the way, in the above case, when a fixed time elapses without receiving the notification signal from the fixed wireless station in a state where the position is registered in a certain fixed wireless station FRS, the registration state of the mobile phone in the fixed wireless station becomes It becomes “registration deletion pending state”. In this state, a position registration deletion signal to which the SID of the fixed wireless station FRS in the "deletion pending state" is transmitted to the fixed wireless station FRS that has completed the new position registration thereafter.
When the fixed radio station FRS receives the location registration deletion signal from the mobile phone, the fixed radio station FRS specified by the same signal only when its own SID is included in the fixed radio station FRS (the fixed radio To the mobile station PRS) via the radio system controller RCE.
A location registration deletion response signal is transmitted to L.

The fixed radio station FRS that has received the notification deletes the corresponding PID on its own “PID registration table”.

Also, if there is no information of "Deregistration pending status" above,
If it is determined that the mobile station is close to the registration boundary state of the fixed radio station FRS (due to a decrease in the received electric field) due to the movement, the mobile station transmits a notification request signal in accordance with the notification request cycle. Without information,
It must be near another fixed radio station FRS and will try to receive a broadcast signal.

Lastly, the position registration control in the radio system controller RCE will be described.

The radio system controller RCE does not have a direct determination function for location registration control, and manages only result information on location registration notified from the fixed radio station FRS. For management, a “PID-SID registration table” (MEM in FIG. 4) is generated in the radio network controller RCE, and registration or deletion is performed based on information notified from the fixed radio station FRS.

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

Further, the radio system controller RCE relays and transmits the “location registration deletion command” to a specific or all fixed radio stations FRS according to an instruction included in the command.

FIG. 11 is a flowchart showing an operation example of location registration.
What corresponds to the figure is shown in another expression.

Further, control in the case where a location registration signal from a mobile phone is received by the multiplexed FRS and this information is transferred to the radio system controller will be described. In this case, the multiplexed FRS determines that the location of the mobile phone has been registered based on the information SIDZ from the self-identification of the master FRS, and the radio system controller RCE
Sends a zone affiliation notification to The radio system controller RCE that has obtained this signal generates a zone management table in its own device as shown in Table 3. The table shows a state where a large number of mobile phones have registered their locations within a certain period of time.

The above example is for a multiple FRS with four sets of transceivers.

(Ii) Incoming call When receiving an incoming call from the exchange PBX, the radio control device RCE performs incoming call control on the call. In performing the incoming call control, an “incoming PID registration table” (MEM in FIG. 4) is generated inside the radio system controller RCE, and the incoming call control is performed.

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

The incoming radio control unit RCE sets the incoming
After registering in the “PID registration table”, all fixed radio stations FRS
Sends an incoming call start execution instruction G command.

In response to this instruction, the fixed radio station (FRS) transmits an incoming call signal addressed to the called mobile phone using the incoming call control channel. On the other hand, if this is received by a mobile phone located in the vicinity, after confirming the ID, an empty channel for communication is searched, and if it is detected, the designation of the channel and the radio line connection request signal are transmitted to the fixed radio station. A reply is sent to the FRS (see FIG. 8 (b)).

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

At the same time, the incoming PID is registered in the S1D in which the incoming setting of the “SID state table” is performed, and the mode is set to the incoming mode.

When receiving an incoming call response request command from the fixed wireless station FRS, refer to the "SID status table" to confirm that the SID is in the incoming call mode, and then establish a line connection between the fixed wireless station FRS and the exchange PBX. At the same time, "SID status table"
Change the mode of the above S1D to the call mode and register it.
The PID is deleted from the “ID registration table”.

 This terminates the incoming call processing.

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

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

In Cc-ch, a transmission process of an incoming signal is performed for the PID specified by the incoming start execution instruction G command, and the mobile phone P
It waits for reception of an incoming response signal from TEL.

Thereafter, an incoming response signal from the mobile phone PTEL is received, and when the own SID is included in the destination SID of the signal, the wireless line connection processing is performed under the initiative of the mobile phone PTEL.

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

The fixed wireless station FRS transmits a ring tone ringing signal to the mobile phone PTEL to ring the ring tone. Thereafter, when a communication input signal addressed to itself is received from the mobile phone PTEL, an incoming call response request command is sent to the radio system controller RCE, and a transition is made to a talking state.

This completes the outer-garment transmission processing. Fig. 8 (a) (b)
Shows a state transition diagram in this case.

 Next, the wireless line connection processing will be described.

Fixed radio station FRS, for uplink and downlink of Cc-ch,
Carrier detection is performed. As a result, when it is confirmed that the mobile phone is empty, an incoming signal is transmitted to the mobile phone PTEL.
After the transmission of the incoming signal is completed, for example, one second waits for a response from the mobile phone PTEL.

If there is no response from the mobile phone PTEL during this time, after α seconds elapse after the standby, the arrival signal is transmitted (retransmitted) again and the apparatus enters a one-second standby state. (Α is a fixed radio station
It is determined by the random timing set independently for each FRS). If there is no response from the mobile phone PTEL during this time, the wireless line connection fails.

The signal elements of the incoming signal are as shown in FIG.
The idle communication channel is information of one S-ch channel for which the fixed wireless station FRS has previously detected empty.

A description will be given of a mobile phone PTEL incoming response signal in response thereto.

In the Cc-ch, the mobile phone PTEL uses the following criterion from among the incoming signals received for a maximum of one second from the completion of receiving the incoming signal from the fixed wireless station FRS that first arrived at itself. Select one from

The S-ch information specified in the incoming signal is compared with the S-ch information that has been previously detected as empty on the mobile phone PTEL side, and the incoming signal is checked with matching information.

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

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

, If it cannot be selected, the signal is selected according to the signals that do not satisfy the condition.

An incoming response signal including the SID selected as described above is returned to the fixed wireless station FRS.

 The traffic channel acquisition is performed as follows.

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

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

The mobile phone PTEL sequentially searches the designated S-ch,
Waits for a channel switching completion signal from the fixed wireless station FRS. When a channel switching completion signal is received, the fixed radio station
Transmits a radio line connection request signal to FRS.

When the mobile phone PTEL cannot receive the channel switching completion signal from the fixed wireless station FRS, the mobile phone PTEL performs a re-incoming call response process. If this fails, the portable telephone PTEL fails to establish a wireless connection and returns to the standby state.
The signal elements of the channel switching completion signal and the wireless line connection request signal are as shown in FIGS.

When the fixed wireless station FRS receives the wireless line connection request signal from the mobile phone PTEL, the fixed wireless station FRS
Sends an incoming call setting request command and sends all fixed radio stations FRS
, And the fixed radio station FRS continuously transmits a ringing tone sounding signal to the mobile phone PTEL connected to the radio line. The mobile phone PTEL rings the incoming signal while receiving it.

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

The signal components of the ringing signal and the incoming call signal are shown in Fig. 5 (i).
(J).

(Iii) Outgoing Call When the outgoing call request occurs, the mobile phone PTEL performs outgoing call processing and connects a wireless line to the fixed wireless station FRS.
After the fixed wireless station FRS has completed the connection of the wireless line with the mobile phone PTEL, the fixed wireless station FRS sends an outgoing connection request command to the wireless system control device RCE to set up the communication line.

The outgoing call process selects three fixed radio stations FRS from among the fixed radio stations FRS registered in the “SID registration table” (MEM in FIG. 2) in the mobile phone PTEL in the case of the normal call process. Call control is performed for the call.

Also, in the case of retransmission processing, an unspecified fixed radio station FRS
(All the fixed wireless stations FRS in the standby state) perform transmission processing.

 Hereinafter, the transmission operation will be described in detail.

When an outgoing call request is made, the mobile phone PTEL uses Cc-ch
Carrier detection is performed for the downlink of (control channel). As a result, when it is confirmed that the SID is empty, for example, up to three SIDs with good conditions are selected from the SIDs registered in the own "SID registration table", and FIG. Is transmitted on a control channel Cc-ch which is a control channel exclusively for transmission (in this embodiment, transmission and reception only).

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

SIDa to c: Destination SIDs are arranged in descending order of conditions. This arrangement becomes timing information to which the fixed wireless station FRS responds.

cha to c: idle communication channel information, and arranges S-ch (communication channels) for which empty detection has been performed in advance on the mobile phone PTEL side, in ascending order of confirmation time.

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

When the fixed radio station FRS receives a transmission signal from the mobile phone PTEL, when its own SID is included as the destination SID, for the S-ch specified by the signal,
This is searched sequentially. As a result, when an empty S-ch is detected, a transmission response signal as shown in FIG. 5 (l) on which the S-ch having the latest confirmation time is placed among the S-ch is designated by the sequence of the destination SID. Then, the message is transmitted to the mobile phone PTEL.

When the mobile phone PTEL receives the transmission response signal from the fixed wireless station FRS, it selects a signal satisfying the following condition from among the signals.

The mobile phone PTEL compares the empty S-ch information specified in the transmission response signal with the S-ch information whose empty has been detected in advance, and checks a signal having matching information.

The signal having the largest signal receiving electric field strength is selected from the transmission responses in which the empty S-ch information matches. At this time, L4
(This is the value when the received electric field strength is divided into 5 levels, and the electric field strength becomes weaker as the numerical value becomes smaller.) When there is no signal having the received electric field strength, the signal is received first from the remaining L3. Choose a signal.

, If it cannot be selected, the signal is selected according to the signals that do not satisfy the condition.

When detecting the transmission response signal as described above, the mobile phone PTEL transmits a fixed wireless station FRS designation signal to the fixed wireless station FRS that has transmitted the signal. After this, fixed radio station F
Both the RS and the mobile phone PTEL start capturing the call channel.

 The traffic channel acquisition is performed as follows.

When the fixed wireless station FRS receives a fixed wireless station FRS designation signal from the mobile phone PTEL to itself, it sequentially performs empty detection for the three designated S-ch according to the signal. When an empty S-ch is detected, a channel switching completion signal is continuously transmitted to the mobile phone PTEL for about 0n5 seconds.

The mobile phone PTEL sequentially searches the designated S-ch,
Waits for a channel switching completion signal from the fixed wireless station FRS. When a channel switching completion signal is received, the fixed radio station
Transmits a line connection request signal to FRS.

When the fixed radio station FRS receives the line connection request signal from the mobile phone PTEL, the fixed radio station FRS sends an outgoing connection request command to the radio system controller RCE, and the radio system controller
This is notified to all fixed wireless stations FRS via RCE.

The mobile phone PTEL enters into a talking state after completing transmission of the line connection request signal.

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

When a call is generated, outgoing or incoming call processing is performed, and after completion, the apparatus enters a talking state. In a call state, transmission of dial signals and transmission / reception of voice signals to and from the line are possible. However, the movement of the mobile phone PTEL or the movement of obstacles around the line (including people) causes the state of the wireless line to change. Changes occur.

For this reason, the state of the wireless line is managed by monitoring the reception electric field strength between the mobile phone PTEL and the fixed wireless station FRS, and if necessary, the wireless line management processing such as zone switching processing and out-of-service processing. I do. Transmission of a control signal during a call is performed using an out-of-voice band (Svo-ch) so as not to disturb the call.

When the distance between the mobile phone PTEL and the fixed radio station FRS with which the mobile phone PTEL is communicating with the mobile phone is increasing during communication and the communication quality is deteriorated, zone switching is performed.

The mobile phone PTEL uses the reception field strength of the fixed radio station FRS,
Alternatively, when the received field strength at the own fixed wireless station FRS falls below a certain value due to a terminal confirmation signal from the fixed wireless station FRS, a monitor request signal as shown in FIG. 5 (m) is transmitted to the fixed wireless station FRS. I do.

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

Hereinafter, for convenience, the fixed wireless station FRS that is currently engaged in a call is called “fixed wireless station FRSs”, or the fixed wireless station FRS to be switched to is called “fixed wireless station
FRSd ".

The zone switching request PTEL continuously transmits the zone switching request signal after transmitting the monitor request signal. The zone switching request signal is transmitted in Svo-ch and has a signal request shown in FIG.

P ₁ · S-ch information: Mobile phone PTEL advance Check Rates already earlier in side S-ch information P ₂ Q Information: The currently used in channel quality information, when satisfied Q ≦ 1 in this state, the zone switching process 2 to go into.

Zone switching response The monitored fixed wireless station FRS enters the zone switching state from the standby state when receiving the zone switching request signal at the monitoring destination Svo-ch under the following conditions.

-Zone switching request signal reception condition (Zone switching request signal reception electric field strength)> (Q information specified by the same signal) The fixed wireless station FRS that has entered the zone switching response state is not allowed to receive S-ch information included in the same signal. The search is performed sequentially, and if a vacant S-ch is detected, the S-ch information is added. If the vacancy detection fails, the fixed radio station FRS adds the vacant-detected S-ch information. The zone switching response signal as shown in FIG. 9 (o) is continuously transmitted after the empty detection for the Cc-ch, and the monitoring destination Svo-ch waits for reception of the FRS designation signal from the mobile phone PTEL.

Designation of fixed wireless station FRS When the mobile phone PTEL receives a zone switching response signal on the Cc-ch under the following conditions, it replaces the zone switching request signal being continuously transmitted on the currently used Svo-ch with the following, The FRS designation signal to which the S-ch information selected by is added is continuously transmitted.

Thereafter, both the fixed wireless station FRS and the mobile phone PTEL start switching processing.

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

1) If the S-ch information included in the zone switching response signal matches the empty S-ch information searched by itself, the S-ch
Information 2) If the condition 1) is not satisfied, the S-ch is detected as empty. If the sky is confirmed, the S-ch information 3) If the conditions 2) and 1) are not satisfied, the mobile phone PTEL side The S-ch information for which the empty channel is newly detected and the empty is confirmed is captured at the switching destination S-ch as follows.

When the fixed radio station FRSd receives the FRS designation signal as shown in FIG. 5 (p) addressed to itself on the monitor channel Svo-ch under the following conditions, the fixed radio station FRSd detects the empty state of the S-ch designated by the signal. Do.

-FRS designation signal reception condition (FRS designation signal reception electric field strength) ≧ (Q information designated by the same signal) When the S-ch is confirmed to be empty as a result of the sky detection, the same channel as shown in FIG. Such a continuous transmission of the channel switching completion signal is performed.

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

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 instead of the FRS designation signal which is continuously transmitted in the Svo-ch currently in use.

-Channel switching completion signal reception condition (Channel switching completion signal reception electric field strength)> (current line quality Q) The mobile phone PTEL starts continuous transmission of FRS designation signals and then continues for a specified time (maximum transmission of FRS designation signals) If the channel switching completion signal from the fixed wireless station FRS cannot be received at the designated destination S-ch even after the elapse of time), the fixed wireless station FR
S acquisition has failed, and a zone switching request is entered again.

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

-Line link request signal reception condition (line link request signal reception electric field strength) ≥ (currently used line Q) After that, when the fixed radio station FRSd receives a connection completion notification command from the radio network controller RCE, the switching channel is switched. Svo
Start continuous transmission of the terminal confirmation signal on -ch.

After the connection request command is transmitted, if the connection completion notification command is not received from the radio network controller RCE within the specified time, the process returns to the standby state. (Monitor request is not canceled).

Switching The mobile phone PTEL uses the fixed wireless station F at the switching destination Svo-ch.
The terminal confirmation signal from RSd is received, and the line quality Q determined from the own electric field information included in the signal and the reception electric field strength of the fixed wireless station FRSd is represented by (mobile phone PTEL−fixed wireless station FRSd line quality Q) ≧ (PT
If EL−fixed wireless station FRSs line product Q) is satisfied, the communication line is switched from fixed wireless station FRSs to fixed wireless station FRSd.

After switching the communication line, the mobile phone PTEL starts continuous transmission of a terminal confirmation signal in Svo-ch.

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

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

Further, when receiving the above notification, the other fixed wireless stations FRS cancel the monitoring of the mobile phone PTEL.

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

Finally, a description will be given of the end of the outgoing / incoming call operation left in the description of the system of the present embodiment.

Termination of PTEL of Mobile Phone When "hang up call" is operated on the cellular phone PTEL during a call, and when the out-of-service processing results in the end of the call (see out-of-service processing), the end of the call processing starts.

At this time, regardless of the state of the mobile phone PTEL,
The end signal is continuously transmitted for a specified time on the Svo-ch of the currently used communication line, and the state returns to the transmission completion standby state.

Fixed radio station FRS end call The fixed radio station FRS receives an end signal from the mobile phone PTEL during a call, or performs out-of-service processing and ends the call (see out-of-service processing). enter.

A call end request command is sent to the radio system controller RCE, and all fixed radio stations FRS are notified of this via the radio system controller RCE.

In addition, all fixed wireless stations FRS are the mobile phone PTEL
Cancels all processing related to the call with.

Radio system controller RCE termination The radio system controller RCE receives the termination request command from the fixed radio station FRS, cancels all the processes related to the call with the fixed radio station FRS, and sends a message to the exchange device PBX. Transmit the end signal. The switching device PBX receives this signal and transmits an end signal to the switching device when the connection is made from an outside line.

System Operations Regarding Fixed Wireless Station Having Multiple Sets of Transceivers The above-described system of the present invention is a case where only one set of transceivers is owned in a fixed wireless station.

On the other hand, in a service area where call traffic is high, a call with a mobile phone may not be made smoothly if the above fixed radio station is installed.
A method has been adopted in which a plurality of sets of transceivers are provided in a set of fixed radio stations. In a fixed wireless station capable of handling a high-density traffic area, as described above, the concept of zone-based location registration is introduced into a service zone managed by the fixed wireless station. Hereinafter, the operation of the location registration and the transmission / reception registration system will be described in order.

The notification signal sent from the multiplexed FRS is sent from the master FRS, and the other transmitters are stopped except for those communicating with the mobile phone, but the receivers are all waiting for reception.
The contents of the notification signal include SIDZ.

Therefore, the location registration, location registration deletion, and location registration initialization are all performed using S1DZ. The location registration request, the location registration deletion request, and the location registration initialization request from the FRS are performed for SIDZ.

FIG. 15 (a) shows a location registration request from a mobile phone received by FRSb (self-identification information is SIDb) in the multiplexed FRS, which is transferred to the RCE. It shows the flow of operation when SIDZ (SIDa) is stored as registration and a location registration response signal is transmitted to FRSb.

FIG. 15 (b) shows the flow of the operation of position registration deletion similarly to FIG. 15 (a). In this case, the location registration deletion execution instruction (downlink) refers to the zone management table (see Table 2) in the RCE, and in the case of multiple FRSs, the S belonging to the execution instruction destination SIDZ
Select two IDs and drop them against them.

FIG. 15 (c) shows the flow of operation in the case of location registration initialization.

 Next, transmission will be described.

Transmission control from PTEL is specified in zone units instead of individual SIDs. Therefore, in the case of calling, a plurality of fixed wireless stations, and thus a plurality of zones, are specified in SIDZ.

In the case of retransmission, the transmission is carried out without specifying the zone. Also, when receiving an incoming call execution instruction G from RCE,
If the incoming PID is registered in the zone to which it belongs, the incoming call is controlled using the FRS individual SID.

As apparent from the above description, the system operation performed by a fixed wireless station to which a plurality of sets of transceivers belong looks exactly the same as a fixed wireless station having only one set of transceivers when viewed from a mobile phone. Therefore, it is clear that the present invention is effective even in this case.

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

(5) Effects of the Invention As described above, by applying the system construction according to the present invention to a small zone system using a microcell, a mobile phone located at an arbitrary position in a service area and another mobile phone or Outgoing / incoming calls can be made between fixed telephones, and communication from places with a lot of external call traffic, which can improve the reliability and quality of communication, can be performed smoothly. Some are extremely large.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing one embodiment of the present invention, and FIG.
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.
5 (a) to 5 (r) are examples of signal formats used in the present invention, FIG. 6 is a diagram showing an example of state transition of a fixed radio station used in the present invention, FIG. FIG. 13 is a flowchart showing an operation example of a location registration request according to the present invention.
9 (a) and 9 (b) are flow charts showing an operation example of incoming call in the present invention, FIG. 9 is a flow chart showing an operation example of outgoing call in the present invention, and FIG. 10 is an operation example of a zone switching process in the present invention. 11 is a flowchart showing FIG. 7 in another expression, FIG. 12 is a flowchart showing an operation example of a fixed wireless station,
FIG. 13 is a flowchart showing an operation example of the mobile phone, FIG. 14 is a block diagram showing an example of the configuration of a plural fixed radio station used in the present invention, and FIGS. 15 (a), (b) and (c) are plural figures. FIG. 5 is a flowchart showing an operation example of the method of the present invention when a fixed wireless station is used.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Kazuo Hashido 1-7-141 Kugayama, Suginami-ku, Tokyo Iwasaki Communication Equipment Co., Ltd. (72) Kazuhide Okamura 1-4-10 Irifune, Chuo-ku, Tokyo No. Tokyo Electric Power Company System Research Laboratory (58) Field surveyed (Int. Cl. ⁶ , DB name) H04B 7/24-7/26 H04Q 7/00-7/38

Claims (1)

(57) [Claims] 1. A plurality of fixed wireless stations arranged so as to form one service area by each fixed wireless station capable of covering a plurality of zones, respectively; A plurality of mobile telephones capable of communicating with a radio station; connecting each of the fixed radio stations to a general telephone network, the mobile telephone and at least one of the fixed radio stations capable of communicating well with the mobile telephone; A radio control device for registering identification information and for making and receiving a call to and from the mobile phone via the registered fixed radio station, wherein the plurality of fixed radio stations include a plurality of radio base stations. A unit is installed, and each of the plurality of wireless base station units transmits an access request and receives an access permission, and also transmits a status signal indicating standby / talking. A main unit that commonly controls the plurality of radio base station units, includes a function of receiving the access request and providing the access permission to the plurality of radio base station units. When one of the plurality of wireless base station units is controlled by the control right response signal to indicate that only the one wireless base station unit responds when one of the wireless base station units indicates the standby state by the state signal, Is a mobile communication system configured so that access for the access request can be performed from the plurality of mobile phones using common self-identification information (SID).