JPH05130028A - Mobile radio communication system and its mobile station equipment - Google Patents

Abstract

PURPOSE:To relieve the processing load of a control circuit by eliminating the need for an identification information memory of a large capacity for a mobile station so as to simplify the circuit configuration and to make the size small and simplifying system discrimination processing. CONSTITUTION:When control information is sent from a base station BSS, a transmission period of system identification information is divided into plural small periods in terms of time, and system discrimination information of its own system is inserted for a predetermined small period for its own system among the small periods and the result is sent, and each system is allocated to each bit of a register 33 in an automobile telephone set MSS, a flag representing whether or not the system is used for a hose system is respectively stored, a sender system is discriminated by detecting to which period the system discrimination information sent from the base station BSS is inserted and whether or not the sender system is the home system is discriminated based on the result of discrimination and the flag stored in the register 33 and the result of discrimination is displayed on an LCD display device 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication system such as an automobile radio telephone system or a portable radio telephone system and its mobile station apparatus, and particularly simplifies collation determination of system identification information in the mobile station apparatus. The present invention relates to a mobile radio communication system and a mobile station device.

[0002]

2. Description of the Related Art As one of mobile radio communication systems, a car radio telephone system employing a cellular system is known. This type of system includes, for example, a control station CS connected to a wired telephone network NW as shown in FIG. 13, and a plurality of base stations BS1 to BSn connected to the control station CS via wired lines CL1 to CLn, respectively. And a plurality of mobile telephone devices MS1 to MSm as mobile stations. The base stations BS1 to BSn form radio zones E1 to En called cells in different areas. The mobile telephone devices MS1 to MSm are connected to a base station in a wireless zone in which the mobile telephone device is located via a wireless channel, and further connected to the wired telephone network NW from this base station via a control station CS. Then, in this state, it becomes possible to talk with the wired telephone connected to the wired telephone network NW. When the mobile phone devices MS1 to MSm move to another wireless zone during a call, the wireless channel is switched to the wireless channel of the base station of the moving destination under the control of the control station CS, and the call continues. That is, each of the mobile telephone devices MS1 to MSm can make a call with another telephone via the adjacent base station as long as it exists in the service area formed by the system to which the own station belongs.

By the way, in recent years, in the metropolitan area and metropolitan areas, a plurality of businesses each construct an automobile radio telephone system to provide independent services, and in addition to the metropolitan area and metropolitan areas, local cities are not limited. Even in central areas, automobile wireless telephone systems have been built and services are being provided. That is, a plurality of systems that provide the same type of service are being operated in the same area or different areas. In such a situation, the car telephone device of each system can call without any problem if it exists in the service area of the system to which the device belongs, that is, the home system. It is general that a call cannot be made while existing in the service area, or even if a call is made, the charge is generally high. Therefore, it is desirable for the user to be able to know when necessary whether the device is within the service area of the home system or within the service area of another system.

Therefore, recently, the system identification information is transmitted from the base station through the control channel, and the system identification information transmitted from the base station is received by the car telephone device and stored in advance in the identification information memory. It has been proposed to provide a means for collating with the system identification information in the home area and displaying the fact when the two identification information do not match as a result of this collation.

[0005]

However, such means have the following problems to be improved. That is, the system identification information is composed of multiple bits such as 15 bits. For this reason, in the car telephone device, each time the system identification information is received, the multi-bit system identification information must be collated each time, which complicates the processing for collation, and the processing circuit or There is a problem that the processing program becomes large-scale. Moreover, since the identification information memory must store the identification information of the multi-bit home system as described above, there is a problem that a relatively large storage area is required. In particular,
When a plurality of systems are used as home systems, all the system identification information of these home systems must be stored in the identification information memory. Therefore, as the identification information memory, for example, a dedicated external memory is provided outside the control circuit. This has been necessary, resulting in an increase in the size of the circuit configuration.

The present invention has been made in view of the above circumstances. An object of the present invention is to simplify the circuit configuration without requiring a large capacity identification information memory in a mobile station device and to simplify the system determination process. It is an object of the present invention to provide a mobile radio communication system and its mobile station device that can be realized by reducing the processing load on the control circuit.

[0007]

In order to achieve the above object, a mobile radio communication system of the present invention comprises:
The transmission period of the control information is time-divided to form a plurality of small periods, and the system determination information corresponding to the system identification information is inserted and transmitted in the small period pre-allocated to the own system among these small periods. I am trying. The mobile station is provided with a flag information storage means and a system determination means, and the flag information storage means is provided with a plurality of flag information storage areas respectively corresponding to a plurality of mobile radio communication systems. In the area, home system information indicating whether connection is desired for each of the plurality of mobile radio communication systems is stored. Then, by the system determination means, during the reception period of the predetermined control information sent from the base station, it is determined whether the system determination information is inserted for each small period, and the determination result, Based on the home system information stored in the flag information storage means, it is determined whether or not the system including the base station that has transmitted the control information is a system desired to be connected. ..

Further, the mobile station apparatus of the present invention comprises a flag information storage means and a system determination means, and the flag information storage means is provided with a plurality of flag information storage areas respectively corresponding to a plurality of mobile radio communication systems. In each of these flag information storage areas, home system information indicating whether or not connection is desired for each of the plurality of mobile radio communication systems is stored. Then, by the system determination means, during the reception period of the predetermined control information sent from the base station, it is determined whether the system determination information is inserted for each small period, and the determination result,
Based on the home system information stored in the flag information storage means, it is determined whether or not the system including the base station that has transmitted the control information is a system desired to be connected. ..

Further, the mobile station apparatus of the present invention is characterized in that the system determining means notifies the result of determining whether or not the system including the base station that has transmitted the control information is the system desired to be connected. To do.

[0010]

As a result, according to the present invention, the mobile station device is provided with a plurality of flag information storage areas respectively corresponding to the respective mobile radio communication systems, and these flag information storage areas are provided in the respective mobile radio communication systems. The home system is registered by storing the home system information indicating whether or not the connection is desired. Therefore, as compared with the case where the system identification information is stored as it is, the memory capacity required for registering the home system can be significantly reduced. Therefore, for example, a register in the control circuit can be used as the identification information memory, and it is not necessary to provide a separate memory.
Accordingly, the circuit configuration can be simplified and downsized, and the mobile station device can be made inexpensive.

In addition, the mobile station apparatus detects in which sub-range of the control information sent from the base station the system determination information is inserted in which sub-period, so that the self-station is in the service area of which system. It is determined whether it exists. Then, based on this determination result and the set position of the flag, it is determined whether or not the system currently received by the local station is the home system. Therefore, it is possible to determine whether or not the system currently received by the own station is the home system without receiving the system identification information and collating the system identification information with each other. Therefore, the processing procedure and the processing contents when the system determination is performed are simplified, and the load on the control circuit can be reduced.

Further, according to the present invention, since the user is informed of the determination result as to whether or not the system including the base station that has transmitted the control information is the home system, the user performs, for example, a call operation. Is not connected, etc.
The reason can be clearly known.

[0013]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a circuit block diagram showing a functional configuration of an automobile wireless telephone system according to an embodiment of the present invention, in which BSS is a base station and MS.
Reference symbol S denotes an automobile telephone device as a mobile station.

First, the base station BSS has means for transmitting the system determination information. When transmitting the control information through the control channel, this means time-divides the transmission period of the system identification information consisting of 15 bits into five small periods as shown in FIG. These small periods are pre-assigned to system 1, system 2, system 3 and system 4, respectively, and the remaining small periods are reserved periods. Then, the base station BSS of each system inserts the system determination information in place of the system identification information of its own system in the small period allocated to its own system, and transmits it to the mobile phone MSS. For example,
If it is the base station BSS of the system 2, as shown in FIG.
1 "is inserted and transmitted. If the base station BSS of system 3 is inserted, the system determination information consisting of" 111 "is inserted and transmitted in the third small period assigned to system 3. To do.

On the other hand, the mobile telephone MSS is roughly divided into a transmission system, a reception system and a control system. A power supply circuit 40 generates an operating voltage Vcc necessary for the device based on the output of the battery 41.

The transmission system is a microphone 1 as a transmitter.
1, a speech coder (SPCOD) 12, an error correction coder (CHCOD) 13, and a digital modulator (MOD)
14, a multiplier 15, a power amplifier (PA) 16, a high frequency switch circuit (SW) 17, and an antenna 18. The voice encoder 12 encodes the transmission signal output from the microphone 11. The error correction encoder 13 performs error correction encoding on the digitized transmission signal output from the speech encoder 12 and the digitized control signal output from the control circuit 30 described later. The digital modulator 14 generates a modulation signal according to the digitized transmission signal output from the error correction encoder 13. In the multiplier 15, this modulated signal is mixed with the local oscillation signal output from the frequency synthesizer 31, and thereby frequency-converted into a radio frequency signal. In the power amplifier 16, the multiplier 1
The wireless transmission signal output from 5 is amplified to a predetermined transmission power. The high frequency switch 17 becomes conductive only during the transmission time slot designated by the control circuit 30,
During this period, the wireless transmission signal output from the power amplifier 16 is supplied to the antenna 18 and transmitted from the antenna 18 to the base station BSS.

On the other hand, the receiving system is a receiver (RX) 21.
, Digital demodulator (DEMOD) 22, error correction decoder (CHDEC) 23, speech decoder (SPDE)
C) 24 and a speaker 25 as a receiver.

In the receiver 21, a mixing operation for directly frequency converting the received high frequency signal received by the antenna 18 and the high frequency switch 17 into an intermediate frequency signal or a base band signal is performed. The digital demodulator 22 performs bit synchronization and frame synchronization, that is, word synchronization with respect to the received digital signal output from the receiver 21, and also performs digital demodulation. Then, the synchronization signal obtained by the word synchronization is supplied to the control circuit 30. The error correction decoder 23 performs error correction decoding on the digital demodulated signal output from the digital demodulator 22.
The signal obtained by this error correction decoding consists of a digital received signal and digital control information, of which the digital received signal is input to the voice decoder 24, and the digital control information is used for various control such as channel setting and call. Is supplied to the control circuit 30. The voice decoder 2
At 4, the decoding process of the digital call signal is performed. Then, the analog reception signal restored to the original state by this decoding process is output as loudspeaker from the speaker 25.

On the other hand, the control system comprises a control circuit (CONT) 30.
, Frequency synthesizer (SYN) 31, control data memory (RAM) 34, console unit (CU)
35, a display drive circuit 36, and a liquid crystal display (LCD) 3
7 and. The frequency synthesizer 31 generates a local oscillation signal corresponding to each channel frequency for control and communication designated by the control circuit 30.

The RAM 34 is used to temporarily store, as necessary, control information such as telephone number information input by a dial key and system determination information sent from the base station BSS via each control channel. .. The console unit 35 is provided with keypads such as dial keys and call request keys. The LCD display 37 is driven by the display drive circuit 36, and is used to display information indicating the determination result of the system determination display control means, which will be described later, together with the telephone number input by the dial key.

By the way, the control circuit 30 includes a microcomputer as a main control unit, and as shown in FIG. 2, for example, an arithmetic logic unit (ALU) 32a, an accumulator (ACC) 32b, a temporary register 32c,
An instruction register 32d, an instruction recorder / machine cycle encoder 32e, a timing generation circuit 32f, a register array 32g and an address buffer 32h are provided. Of these registers, the register array 32g is provided with a plurality of control registers, and one of the registers 33 is used as a register for storing home system information. That is, each of the bits b1 to b8 of the register 33 is assigned to each system. Then, in each of bits b1 to b8, flag information indicating whether or not each corresponding system is to be a home system is stored. For example, when the systems 2 and 3 are now registered as home systems, the flag "1" is set in the bits b2 and b3 corresponding to the systems 2 and 3 and the other bits are set to "0" as shown in FIG. Set.

Further, the control circuit 30 has, as its control function, a system judgment display control means 30a in addition to a series of control functions relating to the initial setting of the apparatus, outgoing / incoming calls and telephone calls. This system determination display control means 30a
The system transmitting the control channel is determined by detecting in which small period the system determination information sent from the base station BSS via the control channel is inserted. Then, it is determined whether or not the system transmitting the control channel is the home system from this determination result and the bit position of the flag information set in the register 33, and the determination result is displayed on the LCD display. Three
7 is displayed.

Next, the operation of the system configured as described above will be described according to the control procedure of the control circuit 30. In the register 33 for storing the home system information of the car telephone device, as shown in FIG.
Will be described as being registered. That is,
The system 2 and the system 3 are registered as home systems in this car telephone device.

When a power switch (not shown) is turned on,
The control circuit 30 starts the control according to the main routine of FIG. 6, and first executes the reset operation in step 2a. That is, as shown in FIG. 7, first, the states of the respective parts of the circuit are reset in step 3a, and subsequently, the setting monitoring of the locked state is performed in step 3b. The locked state is intended to prevent unauthorized use of the device by a third party.When the locked state is set, the device enters the locked state and is used unless a specific key operation is performed thereafter. It will be impossible. It should be noted that "LOCK" is displayed on the LCD display 37 while the locked state is set (step 3c). On the other hand, if the locked state is not set, the LCD display 37 displays "NOSVC" in step 3d.

When the reset is completed in this way, the control circuit 30 then executes an initialization operation in step 2b. That is, as shown in FIG. 8, first, step 4a is performed.
Scan a plurality of control channels (D channels) for initialization, and thereby select the channel having the highest received electric field strength and the channel having the next highest received electric field strength.
Then, in step 4b, control for establishing bit synchronization and frame synchronization, that is, word synchronization for the D channel having the highest received electric field strength is performed.
When the word synchronization is established within a certain time by this control, the process proceeds to step 4c, where the system determination information sent from the base station BSS via the D channel is received, and further received in step 4e. It is possible to identify the transmission source system and determine the identification result by RA
Once stored in M34.

The above steps 4b and 4
In c, if the word synchronization cannot be established within a fixed time or the system identification information cannot be detected, the process proceeds to step 4d, where the D channel having the next largest received electric field strength is selected. The steps 4b to 4e are controlled for this D channel.

When the initialization is completed in this way, the control circuit 30 then proceeds to step 2c and executes the control control of the control channel (P channel) for performing the standby operation. That is, as shown in FIG. 9, first, in step 5a, a plurality of P channels are scanned, and thereby, the channel having the largest received electric field strength and the channel having the next largest are selected. Next, in step 5b, control for establishing bit synchronization and frame synchronization, that is, word synchronization is executed for the P channel having the maximum received electric field strength. When the word synchronization is established within a fixed time, the process proceeds to step 5c, where the system determination information sent from the base station BSS via the P channel is received.

Incidentally, the above step 5b and step 5
In c, if the word synchronization is not established within a fixed time, respectively, or if the system determination information is not detected within a fixed time, in step 5d, the P channel having the next largest received electric field strength is selected, Establish word synchronization and detect system identification information for this P channel. If the system determination information detected from the P channel does not match the system determination information detected from the D channel at the time of initialization in step 5c, the process directly returns to the initialization control (step 2b).

By the way, the control circuit 30 executes the above step 5
When the system determination information is detected in c, step 5e
Then, the system determination display control is executed as follows. FIG. 12 is a flowchart showing the control procedure and control contents. That is, the control circuit 30 first takes in the received system determination information in step 8a, and determines in which sub-period the received system determination information is inserted in step 8b.
Identify the originating system. And then step 8
In c, the flag information is read from the register 33 for storing home system information, and it is determined in step 8d whether or not the system identified by the system determination information is the home system.

For example, if the system determination information is inserted in the second small period as shown in FIG.
In step 8b, it is determined that the transmission source system is the system 2. Then, the flag information of the bit position b2 in the register 33 corresponding to this system 2 is set in step 8
It is determined by d. Since "1" is registered in the bit position b2 of the register 30 as described above, the system 2 is determined to be the home system and is recognized in step 8e. Then, when the control circuit 30 recognizes the home system, the control circuit 30 goes to step 8f and displays nothing on the LCD display 37 to indicate the home system.

On the other hand, if it is assumed that the system determination information is inserted, for example, in the first small period or the fourth small period, the transmission source system is the system 1 or the system 4 in step 8b. Is determined. Then, the flag information of the bit positions b1 and b4 in the register 33 corresponding to the system 1 or 4 is determined in step 8d. Now, in the bit positions b1 and b4 of the register 30, both are "0" as shown in FIG.
Since it is registered, it is determined that the system 1 or the system 4 is not the home system, and step 8g
Recognized in. Then, when recognizing that the system is not the home system, the control circuit 30 proceeds to step 8h and displays the display pattern "ROAM" indicating that the system is not the home system on the LCD display 37.

Therefore, the user can know whether the current position of the own device is within the service area of the home system or within the service area of another system based on the presence or absence of the "ROAM" display. Then, when the area is identified and displayed, the control circuit 30 thereafter shifts to the standby operation state (step 2d).

Now, in this standby operation state, it is assumed that an incoming call signal arrives from the base station BSS via the P channel. Then, the control circuit 30 proceeds to step 2e, where the incoming call response control is executed. That is, as shown in FIG. 10, the control circuit 30 first scans a plurality of control channels (A channels) called access channels used to establish a communication channel in step 6a, and selects a channel having the highest received electric field strength, Select each next largest channel. Then, the operation for establishing the word synchronization with respect to the selected A channel is performed in step 6b, and when the word synchronization is established within a certain time, the process proceeds to step 6c, where the above-mentioned A channel is used. The system determination information sent from the base station BSS is received.

In step 6c, if the system determination information is received within the fixed time, the control circuit 30 next executes the system determination display control in step 6e.
That is, as described in FIG. 12, step 8b
The system of the transmission source is identified by determining in which small period the received system determination information was inserted. In step 8d, it is determined whether or not the transmission source system identified by the system determination information is the home system. If it is determined in step 8d that the system is the home system, the display of "ROAM" is turned off in step 8f, while if it is determined that the system is not the home system, the LCD display 3
“ROAM” is displayed in 7. That is, here, based on the system determination information sent via the A channel, it is determined whether or not the system in the service area in which the own device is present is the home system, and the determination result is displayed. .. Therefore, when the own device moves from the service area of the home system to the service area of another system that does not want to use during the standby operation, for example, re-determination of the system and the determination result The display is updated.

When the determination display control of the system is completed in this way, the control circuit 30 continues to step 6f,
Here, the incoming call response signal is sent to the base station B via the A channel.
Return to SS. Then, after the return of the incoming call response signal, the arrival of the call channel designating signal from the base station BSS is waited in step 6g, and when the call channel designating signal is received, a shorted burst is transmitted to set the time alignment. Then, in step 6h, the speech channel (DT channel) designated by the speech channel designation signal is captured and set. Then, in this state, the system waits for reception of a calling signal (step 2f).
When the ringing signal is received in this state, for example, a ringer sound is generated from a sounder (not shown), and thereafter the control circuit 30 enters a waiting state for the user's response (step 2g). Then, when the user who recognizes the occurrence of the incoming call by the ringer sound performs an off-hook operation and responds, the control circuit 30 proceeds to step 2h and thereafter executes the call control.

The above-mentioned steps 2f and 2
When the end signal is received at g, the control circuit 30 shifts to step 2i, cancels the reception state by the communication channel here, and stops the operation of the transmission system at step 2j, and then performs the initialization operation. Return to. Further, in the states of steps 2f, 2g, and 2h, when the received electric field strength continuously drops below a predetermined level for a predetermined time or longer due to the influence of fading or the like, the control circuit 30 shifts to step 2j, where the transmission system After the operation of is stopped, it returns to the initialization operation.

On the other hand, the standby operation state (step 2d)
In, it is assumed that the call request key is operated or a call request is generated by voice dialing. Then, the control circuit 30 proceeds to step 2k and executes call control here as follows. FIG. 11 is a flowchart showing the control procedure and control contents.

That is, the control circuit 30 first executes step 7
At a, a timer for measuring the call acceptance time is started. This call acceptance time is set to 12 seconds, for example. The control circuit 30 then scans the plurality of A channels in step 7b, thereby selecting the channel having the largest received electric field strength and the channel having the next largest received electric field strength. Then, in step 7c, it is determined whether or not there is a calling intention, and if there is a calling intention, the process proceeds to step 7d, where control for establishing word synchronization for the A channel is performed. The determination as to whether or not there is a calling intention is made based on whether the calling flag is "1" or "0".
The calling flag is set to "1" when the "SEND" key is pressed after the telephone number of the other party is input. If it is determined that there is no calling intention, the process returns to the initialization operation.

When the word synchronization is established in step 7d, the control circuit 30 confirms the calling intention again in step 7f, and if there is the intention, the calling control channel (A channel) is captured and set in step 7g. To do. At this time, the control circuit 30 receives the system determination information sent from the base station BSS via the captured transmission control channel. Then, using the above-mentioned captured transmission control channel, a calling signal including information corresponding to the telephone number of the other party previously input by the user is sent to the base station BSS (step 7h). If the transmission control channel cannot be acquired within the fixed time, it is determined that the acquisition has failed in step 7i, and the process returns to step 7f.

When the transmission of the calling signal is completed, the control circuit 30 proceeds to step 7j and executes the system determination display control. That is, also in this case, similarly to the case of the incoming call response control, it is determined in which sub-period the received system determination information is inserted in step 8b according to the procedure described in FIG. Identifies the source system. In step 8d, it is determined whether or not the transmission source system identified by the system determination information is the home system. If the home system is determined in step 8d, "ROA" is selected in step 8f.
The display of "M" is turned off, while "ROAM" is displayed on the LCD display 37 when it is determined that the system is not the home system. That is, here, the system determination information sent via the A channel is used. It is determined whether or not the system in the service area in which the device is currently located is the home system, and the result of the determination is displayed. When the user moves to the service area of another system that he / she does not want to use, the system is re-judged and the display of the judgment result is updated at the time of this call.

When the judgment display control of the system is completed in this way, the control circuit 30 then proceeds to step 7k to monitor the return of the call response signal. When the call response signal is returned from the base station BSS, the control circuit 30
Establishes slot synchronization for the A channel, then sends a shorted burst to set time alignment,
Then, the process proceeds to step 7l. Then, in this step 71, control is performed to capture the call channel (DT channel) specified by the call response signal, and if the capture of this DT channel is successful, then the call state (step 2h) is entered. To do. It should be noted that in steps 7k and 7l, the return of the call response signal is not detected within a fixed time, or D
If the acquisition of the T channel fails, the initialization operation is restored.

As described above, in the system of this embodiment, when the base station BSS sends control information through the control channel, the sending period of the system identification information is time-divided into a plurality of small periods, and these small periods are divided. The system determination information of the own system is inserted into a small period pre-allocated to the own system and is transmitted to the mobile phone MSS. In the car telephone MSS, register 3
Each system is assigned to each bit b1 to b8 of 3 and a flag indicating whether or not the system is a home system is stored. Then, the system determination / display control means 30a determines the system transmitting the control channel by detecting in which small period the system determination information sent from the base station BSS via the control channel is inserted. Then, based on the determination result and the flag information stored in the register 33, it is determined whether or not the transmission source system is the home system, and the determination result is displayed on the LCD display 37. There is.

Therefore, according to the present embodiment, in the mobile telephone MSS, registration of the home system is performed by setting flags in the bits b1 to b8 of the register 33 in the control circuit 30. Therefore, as compared with the case where the system identification information is stored as it is, the memory capacity required for registering the home system can be significantly reduced. Therefore, it is not necessary to provide a memory for storing the system identification information outside the control circuit 30, so that it is possible to provide the automobile telephone MSS at a low cost by simplifying the circuit configuration accordingly.

Further, in the mobile telephone MSS, the system of the transmission source is identified by determining in which small period the system determination information sent from the base station BSS is inserted, and the identified system is identified. From the state of the flag at the bit position of the corresponding register 33, it is determined whether or not the transmission source system is the home system. Therefore, it is possible to determine whether or not the transmission source system is the home system without performing the collation process of the system identification information, which simplifies the processing procedure and the processing content when performing the system determination. can do. Therefore, the processing load on the control circuit 30 can be reduced.

Further, according to the present invention, when it is determined that the transmission source system is not the home system, the fact is displayed on the LCD display 37 as "ROAM". The state of the device can be clearly known.

The present invention is not limited to the above embodiment. For example, in the above-mentioned embodiment, when it is determined that the own device exists in the service area of a system other than the home system, “ROAM” is displayed and it is determined that the device exists in the service area of the home system. In this case, nothing is displayed, but when it is determined that the own device exists in the service area of the home system, for example, “HOME” is displayed, and the own device displays a service of a system other than the home system. If it is determined that it exists in the area, it may be configured not to display.
In addition, "ROAM" and "HOME" may be displayed according to the area in which the device is present. Further, the display form in the case of "ROAM" may be made different from that in the home area by, for example, blinking, changing the display color, and simultaneously generating an alarm sound.

In the above embodiment, the case where four systems are operated has been described as an example, but it may be applied when only three or two systems are operated, and five or more systems are further added. It may be applied when operating. Further, in the above-mentioned embodiment, the system determination information is composed of 3 bits ("111"), but it may be constructed of 2 bits or 1 bit, or 4 bits if there is a margin in the transmission period of the system determination information. You may comprise by the above.

Further, in the above embodiment, one system is assigned to each of the bits b1 to b8 of the register 33 to store 1-bit flag information indicating whether the system is a home system or not. The flag information indicating whether or not the flag information may be composed of 2 bits or 3 bits or more.

In the above embodiment, the car telephone device is explained as an example. However, the invention is applied to a mobile radio telephone device, a cordless telephone, and a mobile terminal device used in another mobile radio communication system such as an MCA system. Good.

In addition, the device configuration, the control procedure and control contents of the control circuit, the type and configuration of the display unit, the display form, and the like can be variously modified and implemented without departing from the scope of the present invention.

[0051]

As described above in detail, in the mobile radio communication system of the present invention, the base station forms a plurality of sub-periods by time-sharing the transmission period of the control information. The system determination information corresponding to the system identification information is inserted and transmitted in a small period pre-allocated to the system. The mobile station is provided with a flag information storage means and a system determination means, and the flag information storage means is provided with a plurality of flag information storage areas respectively corresponding to a plurality of mobile radio communication systems. In the area, home system information indicating whether connection is desired for each of the plurality of mobile radio communication systems is stored. Then, by the system determination means, during the reception period of the predetermined control information sent from the base station, it is determined whether the system determination information is inserted for each small period, and the determination result, Based on the home system information stored in the flag information storage means, it is determined whether or not the system including the base station that has transmitted the control information is a system desired to be connected. ..

Further, the mobile station apparatus of the present invention comprises flag information storage means and system determination means, and the flag information storage means is provided with a plurality of flag information storage areas respectively corresponding to a plurality of mobile radio communication systems. In each of these flag information storage areas, home system information indicating whether or not connection is desired for each of the plurality of mobile radio communication systems is stored. Then, by the system determination means, during the reception period of the predetermined control information sent from the base station, it is determined whether the system determination information is inserted for each small period, and the determination result,
Based on the home system information stored in the flag information storage means, it is determined whether or not the system including the base station that has transmitted the control information is a system desired to be connected. ..

Therefore, according to the present invention, it is possible to simplify the circuit configuration by eliminating the need for a large-capacity identification information memory in the mobile station device, and simplify the system determination processing to reduce the processing load on the control circuit. It is possible to provide a mobile radio communication system and a mobile station device that can perform the mobile radio communication system.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing a functional configuration of a car telephone system according to an embodiment of the present invention.

2 is a circuit block diagram showing an example of a configuration of a control circuit of the automobile telephone device shown in FIG.

FIG. 3 is a diagram showing a transmission format of system determination information in a base station.

FIG. 4 is a diagram showing a specific example of system determination information transmitted from a base station.

FIG. 5 is a diagram showing a configuration of a register for storing home system information and a specific example of home system information stored in this register.

6 is a flowchart showing a main routine in a control circuit of the apparatus shown in FIG.

7 is a flowchart showing a reset operation procedure and its contents in the flowchart shown in FIG.

8 is a flowchart showing the procedure and contents of the initialization operation in the flowchart shown in FIG.

9 is a flowchart showing a control procedure and its contents relating to a P channel selection operation in the flowchart shown in FIG.

10 is a flowchart showing the control procedure and control contents of the incoming call response control in the flowchart shown in FIG.

FIG. 11 is a flowchart showing a control procedure of call control in the flowchart shown in FIG. 6 and its control content.

FIG. 12 is a flowchart showing the procedure and contents of system determination display control processing.

FIG. 13 is a schematic configuration diagram of a cellular phone system adopting a cellular system.

[Explanation of symbols]

NW ... Wired telephone network, CS ... Control station, CL, CL1-CL
n ... Wired line, BS1 to BS3 ... Base station, MS1 to MS
4 ... Mobile station, E1 to E3 ... Radio zone, 11 ... Microphone, 12 ... Voice encoder (SPCOD), 13 ... Error correction encoder (CHCOD), 14 ... Digital modulator (M
OD), 15 ... Multiplier, 16 ... Transmission power amplifier (P
A), 17 ... High frequency switch (SW), 18 ... Antenna, 21 ... Receiver (RX), 22 ... Digital demodulator (DEMOD), 23 ... Error correction decoder (CHDE)
C), 24 ... Speech decoder (SPDEC), 25 ... Speaker, 30 ... Control circuit (CONT), 31 ... Frequency synthesizer (SYN), 33 ... Register for storing home system information, 34 ... Control data memory (RAM) , 35 ...
Console unit (CU), 36 ... Display drive circuit, 3
7 ... LCD display, 40 ... Power supply circuit, 41 ... Battery,
30a ... System determination display control means.

Claims (3)

[Claims] 1. A mobile radio communication system operated in a state where another mobile radio communication system providing the same type of service exists in the same area or in another area, wherein at least one base station and a plurality of mobile stations are provided. The base station time-divides a transmission period of predetermined control information to form a plurality of small periods, and corresponds to the system identification information in a small period pre-allocated to its own system among these small periods. The mobile station has a plurality of flag information storage areas respectively corresponding to the plurality of mobile radio communication systems, and the plurality of mobile stations in the flag information storage areas. Flag information storage means for respectively storing home system information indicating whether or not connection is desired for each of the wireless communication systems, and sent from the base station. During the reception period of the predetermined control information, it is determined whether or not the system determination information is inserted for each small period, and the determination result, and the home system information stored in the flag information storage means. Based on the above, a system including a base station that has transmitted the control information is provided with system determination means for determining whether or not the system is a system desired to be connected, and a mobile radio communication system. 2. A plurality of mobile radio communication systems providing the same type of service are present in the same area or different areas,
And the base station of the plurality of mobile radio communication systems, time division of the transmission period of the predetermined control information to form a plurality of small periods, among these small periods pre-allocated to its system In a mobile station device used in a state of inserting and transmitting system determination information corresponding to system identification information, the mobile station device has a plurality of flag information storage areas respectively corresponding to the plurality of mobile radio communication systems, and these flag information Flag information storage means for storing home system information indicating whether or not to desire connection to each of the plurality of mobile radio communication systems in a storage area, and the predetermined control information sent from the base station. During the reception period, it is determined whether or not the system determination information is inserted for each small period, and the determination result and the flag information storage means store the result. A system determination means for determining whether or not the system including the base station that has transmitted the control information is a system desired to be connected based on the home system information that is present. Station equipment. 3. The system determining means has means for notifying a result of determining whether or not the system including the base station which has transmitted the control information is a system desired to be connected. The mobile station device according to 1.