JP2000032548A - Mobile terminal equipment and message display method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cope with a fault by recognizing a detailed cause for the nonconformity caused in a mobile communication system. SOLUTION: This mobile terminal equipment, constituting a mobile communication system, is provided with a reception means 14 that receive notice information representing a anomaly state sent from a base station of the mobile communication system, an analysis means 10 that analyzes the notice information received by the reception means, and a display section 18 that displays a message denoting a fault state, in response to the result of analysis by the analysis means. Furthermore, in the message display method for the mobile terminal which is being a component of the mobile communication system, the notice information denoting the fault state sent from a base station of the mobile communication system is received, the received notice information is analyzed, and a message denoting the fault state is displayed in response to the result of analysis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal device used in a mobile communication system adopting a cellular system and a message display method thereof, and more particularly to a technique for displaying information of a base station to inform a user.

[0002]

2. Description of the Related Art Conventionally, there have been known mobile communication systems employing a cellular system such as a car telephone system, a portable telephone system, a cordless telephone system, and a PHS (Personal Handy Phone System). In such a mobile communication system, a cordless telephone is used as a mobile terminal device.

The cordless telephone has a display device for displaying various messages. Normally, if the position where the cordless telephone is located is in the service area (the base station is present in the vicinity), a symbol indicating this fact is displayed on the display device (hereinafter referred to as “service area display”). If there is no base station in the area, no area display is made. This allows the user to know whether communication is possible.

[0004] However, a situation where the cordless telephone cannot be used normally, for example, the area is not displayed in spite of the presence of the base station, or the call cannot be transmitted and / or received in spite of the area display is performed. When such a situation occurs, the user cannot know the reason only by the above-mentioned area display.

[0005] Specific cases in which a base station is out of service area in the presence of a nearby base station include a case where the base station is unavailable, a case where country codes do not match, and a case where location registration is rejected (retry cannot be performed). is there. Also, as a specific case in which outgoing and / or incoming calls cannot be made in spite of being within range, when location registration cannot be performed due to radio abnormality, when location registration is rejected (retry possible), when outgoing call is regulated,
There are cases where location registration is being regulated.

[0006]

As a technique related to such a mobile terminal device, for example, Japanese Patent Laid-Open No. 5-32842 is disclosed.
No. 3 discloses a "mobile phone system". In this mobile phone system, the plurality of base stations include a requesting unit that requests the switchboard for location information of a wireless base station having an unused channel, and a unit that notifies the notified location information to the requesting mobile phone. A first storage means for storing whether or not the channel is in use;
A second storage unit for storing position information; a unit for searching for position information of a wireless base station having an unused channel; and a unit for notifying the searched position information. Is displayed.

[0007] According to this portable telephone system, when all the channels of the radio base station covering the area where the subscriber carrying the portable telephone is located are used, the subscriber:
The location information of a wireless base station having an unused channel can be known. However, this mobile phone system only informs the subscriber of the location information of the radio base station having an unused channel, and cannot inform the subscriber of the causes of various troubles occurring in the mobile phone system. .

Further, Japanese Patent Application Laid-Open No. 6-69661 discloses that
A "location management system using mobile communication" is disclosed. This location management system based on mobile communication, when receiving a call notification from a mobile station (cordless telephone) via a base station to the exchange, carries carrier information and map information according to the call information, and a telephone of a wired telephone. When the computer reads out the number, information on the carrier and a map showing the location of the carrier are displayed on the input / output device, and when the exchange makes a call to the telephone corresponding to the telephone number, the administrator can make a call to the mobile station. A call is made with a caller (carrier), and at the same time, the displayed information and the map of the location are confirmed, so that it is possible to confirm who the caller is and where the caller is.

According to the location management system based on mobile communication, a large number of persons carry cordless handsets of a cordless telephone, and the positions of the holders are comprehensively managed in a certain specific area such as in a company or a building. Services can be realized at low communication costs. However, in this system, the administrator can know the information and location of the carrier by looking at the input / output device, but the carrier can know the cause even if a malfunction occurs in the cordless telephone. Can not.

[0010] Japanese Patent Application Laid-Open No. 6-339176 discloses a "public digital cordless telephone system". In this method, a public digital network is used for a wired switching network, and a wireless base station and a charging management device are connected as terminals of the switching network. Then, when the wireless terminal moves to the service zone, activates the wireless terminal, or the like, the wireless terminal requests the wireless base station that manages the service zone in which the wireless terminal exists to register position information. On the other hand, the radio base station that has received the registration request calls the charging management device via the public digital network, inquires of “connection unusable” after connecting the line, receives the result, disconnects the line, and disconnects the wireless terminal. Notify the result. The wireless terminal displays the result, and when notified of "connection unreachable", prohibits the calling process from the terminal.

According to this digital cordless telephone system for public use, it is determined whether or not the connection between the wireless terminal and the switching network is possible without making a connection between the wireless terminal and the switching network. Can be used effectively. However, in this public digital cordless telephone system, the user can only know whether connection is possible or not, and cannot know the cause of various troubles occurring in the system to which the public digital cordless telephone system is applied.

Japanese Patent Application Laid-Open No. 7-327260 discloses a "digital cordless telephone system". This digital cordless telephone system includes a mobile station for setting a CS-ID and transmitting a call setup message to a mobile station management device when a base station area to which the digital cordless telephone system belongs changes. A call processing device for extracting a subscriber number of the mobile station and transferring the extracted subscriber number to a control device; a storage device having a base station management table for storing a base station number and address data in association with each other;
The mobile station management device includes a control device that retrieves address data from the ID and displays the current position of the mobile station on a display device.

According to this digital cordless telephone system, the current location and travel route of the mobile station can be known, so that the behavior of the operator of the mobile station can be sufficiently grasped. In addition, by having a mobile station held by a small child, it is possible to protect from an accident or an incident. However, in this digital cordless telephone system, the mobile station management device can know the current position and the moving route of the mobile station. I can't know.

Furthermore, Japanese Patent Application Laid-Open No. 9-163445 discloses a "cordless telephone device". In this cordless telephone device, when the operator presses the number of the mobile station that he / she wants to call, the microcomputer of the base station detects the number and determines whether the calling mobile station is in range or out of range. If the mobile station is within the service area, the wireless communication is continued as it is, and a transition is made to one-to-one communication with the mobile station in response to a response from the calling mobile station. If not, the microcomputer of the base station reads the mobile station's public dial number stored in the ID memory, closes the line control switch, and calls the mobile station via the public line using the public dial number. When the called mobile station answers, an external call is established via the public line.

According to this cordless telephone device, when calling a mobile station from a base station, the mobile station can be reliably called by a single operation regardless of whether the mobile station is outside or within range. However, in a cordless telephone device, when a failure occurs in a system, the cause cannot be known.

As described above, in the case where the cordless telephone cannot be used normally in the conventional mobile communication system, the user can at most know that the cordless telephone cannot be communicated because the cordless telephone is out of the service area. There is no way to know the details of the cause. As a result, there is a problem that effective measures cannot be taken, and the mobile terminal device (cordless telephone) cannot be effectively used.

It is an object of the present invention to provide a mobile terminal device and a message display method capable of knowing a detailed cause of a failure that has occurred in a mobile communication system and effectively dealing with the failure.

[0018]

A mobile terminal device according to a first aspect of the present invention is a mobile terminal device constituting a mobile communication system for achieving the above object, and comprises a base station of the mobile communication system. Receiving means for receiving broadcast information indicating an abnormal state sent from a station, analyzing means for analyzing the broadcast information received by the receiving means, and a message indicating the abnormal state according to the analysis result by the analyzing means; And a display section for displaying

In this case, the analyzing means can be configured to analyze an abnormal state based on the broadcast information received by the receiving means when at least one of standby, transmission or transmission, and handover is performed.

A mobile terminal according to a second aspect of the present invention is a mobile terminal constituting a mobile communication system for the same purpose as described above, and is provided between the mobile terminal and a base station of the mobile communication system. Detecting means for detecting an abnormality of wireless transmission and reception performed, analyzing means for analyzing information detected by the detecting means, and a display unit for displaying a message indicating the abnormal state according to the analysis result by the analyzing means, It has.

In this case, when at least one of standby, transmission or transmission, and handover is performed, the analysis unit detects an abnormality in radio transmission and reception performed with the base station of the mobile communication system, and detects the abnormality. It can be configured to analyze the abnormal state based on the result.

Further, a message display method for a mobile terminal device according to a third aspect of the present invention is a method for displaying a message for a mobile terminal device constituting a mobile communication system for the same purpose as described above, wherein: It receives broadcast information indicating an abnormal state sent from a base station of the system, analyzes the received broadcast information, and displays a message indicating the abnormal state according to the analysis result.

In this case, the step of analyzing the broadcast information can be configured to analyze an abnormal state based on the received broadcast information when at least one of standby, transmission or transmission, and handover is performed.

A message display method for a mobile terminal device according to a fourth aspect of the present invention is a method for displaying a message for a mobile terminal device constituting a mobile communication system, for the same purpose as described above, wherein An abnormality in wireless transmission / reception performed with the base station of the system is detected, the detected information is analyzed, and a message indicating the abnormal state is displayed according to the analysis result.

[0025] In this case, the step of analyzing the detected information includes, when at least one of standby, transmission or transmission, and handover is performed, an abnormality in radio transmission / reception performed with the base station of the mobile communication system. Is detected, and an abnormal state is analyzed based on the detection result.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mobile terminal device according to an embodiment of the present invention will be described in detail with reference to the drawings.
Hereinafter, as an example of the mobile terminal device, a cordless telephone used in a simplified form telephone system (PHS) will be described. However, a system to which the mobile terminal device according to the present invention is applied is not limited to the PHS. The present invention can be applied to systems for public use, home use, and business use, such as a car phone system, a mobile phone system, and a cordless phone system.

FIG. 1 is a diagram showing a configuration of a mobile communication system to which the cordless telephone is applied. This mobile communication system is a base station (hereinafter referred to as “CS: Cell Station”).
1) and a plurality of cordless telephones (hereinafter sometimes abbreviated as “PS: Personal Station”) 2 ₁ , 2 ₂ ,..., 2 _n as mobile stations. I have. The base station 1 is connected to each cordless telephone by radio and is connected to a telephone network by wire.

FIG. 2 is a block diagram showing an electrical configuration of a cordless telephone used in such a mobile communication system. This cordless telephone has a control unit 10, a read only memory (ROM) 11, a random access memory (RAM) 12, a baseband unit 13, a wireless unit 1
4, antenna 15, microphone 16, receiver 1
7, an LCD device 18, a key 19, an LED 20, a vibrator 21, and a sounder 22.

The control unit 10 includes, for example, a central processing unit (CP)
U), and controls the entire cordless telephone. The control unit 10 controls each unit of the cordless telephone according to a control program stored in the ROM 11. The ROM 11 stores various fixed data used by the control unit 10 in addition to the control program. The RAM 12 is used as a work area when the control unit 10 performs processing. The processing performed by the control unit 10 will be described later in detail with reference to a flowchart.

The baseband unit 13 includes, for example, an A / D conversion circuit and a codec circuit. For example, compression and decompression of an audio signal for wireless transmission, modulation and demodulation of a connection sequence control signal with a base station, and transmission of an audio signal and a control signal are performed. Synthesis and separation. The baseband unit 13 is, for example, a DSP (Digita
l Signal Processor).
The baseband unit 13 processes the signal from the control unit 10 and supplies it to the radio unit 14 as a baseband signal, and also processes the signal from the radio unit 14 and supplies it to the control unit 10.

A microphone 16 and a receiver 17 are connected to the baseband section 13. The microphone 16 converts the input voice into an electric signal. This electric signal is supplied to the radio unit 14 after predetermined processing is performed in the baseband unit 13. The receiver 17 is composed of, for example, a speaker. The signal from the radio unit 14 is supplied to the receiver 17 after being subjected to predetermined processing in the baseband unit 13. Thereby, sound is generated from the receiver 17.

The radio section 14 includes a receiving section and a transmitting section (not shown). The receiving unit amplifies the radio frequency signal from the antenna 15 and demodulates the signal into a baseband signal. As a result, signals representing voices and the like transmitted as radio waves are captured by the cordless telephone via the antenna 15. On the other hand, the transmission unit modulates the high-frequency signal with the baseband signal, converts the signal into a radio frequency signal, amplifies the radio frequency signal, and supplies the signal to the antenna 15. As a result, signals representing voices and the like generated by the cordless telephone are transmitted as radio waves via the antenna 15.

The LCD device 18 is used to display various messages. This message includes various states related to the mobile communication system, such as the state of the base station 1 and the state of the cordless telephone itself. This L
An example of a message displayed on the CD device 18 will be described later in detail. The content of the message displayed on the LCD device 18 is determined according to display data from the control unit 10.

The keys 19 are composed of ten keys, function keys and the like. The key 19 is used by the user to use various functions of the cordless telephone and to input a telephone number. The information input from the key 19 is supplied to the control unit 10. In addition, LED20
Is used to display the pressed state of some or all of the keys 19. Turning on / off of the LED 20 is controlled by a signal from the control unit 10.

The vibrator 21 is used to notify the user of an incoming call by vibration. Whether or not to vibrate the vibrator 21 is controlled by a signal from the control unit 10. Further, the sounder 22 is used to generate a ring tone, an alarm sound, and the like. Whether or not sound is generated by the sounder 22 and the type of sound to be generated are controlled by a signal from the control unit 10.

Next, among the functions realized by the control unit 10, only the functions related to the present invention will be described with reference to the functional block diagram shown in FIG.

As shown in FIG. 3, the control unit 10 includes a system control unit 100 implemented by software, for example.
It comprises an LCD display control unit 101 and a wireless control unit 102. The schematic functions of these units are as follows.

That is, the system control unit 100 starts the standby operation for the base station by notifying the wireless control unit 102 of the standby request. Further, when the standby to the base station is completed, the base station information of the standby base station is notified from the wireless control unit 102. In order to display this base station information on the LCD device 18, the LCD display control unit 101 Notify display request.

The LCD display controller 101 supplies display data to the LCD device 18 in response to a display request from the system controller 100. As a result, the base station information of the standby base station is displayed on the LCD device 18.

The wireless control unit 102 includes the system control unit 10
If there is a standby request from 0 to the base station, the radio unit 1
4 makes the base station search. Also, the wireless control unit 102
Notifies the system control unit 100 of information on the base station obtained from the radio unit 14 as a result of the base station search. The information on the base station includes information indicating the presence or absence of the base station and broadcast information indicating the state of the base station.

Next, the notification information will be described with reference to FIGS.
This will be described with reference to FIG. The broadcast information includes radio channel broadcast information (see FIG. 4), system broadcast information (see FIG. 5),
It comprises second system notification information (see FIG. 6) and third system notification information. Among these, the system broadcast information, the second system broadcast information, and the third system broadcast information are optional. Note that, in this embodiment, the third system broadcast information is not used, and thus the description is omitted.

FIG. 4 shows the format of the wireless channel broadcast information. The wireless channel broadcast information is composed of 8-byte data, and mainly includes information for recognizing the timing of a signal from the base station. Since the meaning of each field of the wireless channel broadcast information is defined in "Second generation cordless telephone system standard RCR STD-28", description other than that relating to the present invention will be omitted below. The same applies to the system broadcast information and the second system broadcast information.

The broadcast status indication field defined in bits 6 to 4 of the seventh byte indicates the presence or absence of option information. That is, bit 6 designates the presence or absence of system broadcast information, bit 5 designates the presence or absence of second system broadcast information, and bit 4 designates the presence or absence of third system broadcast information. Each bit is “0” indicating that no information is present, and “1” indicating that information is present.

FIG. 5 shows the format of the system notification information. Bit 5 in the CS information field defined in bits 6 to 1 of the third byte indicates whether the base station can be used. That is, when the bit 5 is "0", it indicates that the standby base station can be used, that is, the zone can be selected. On the other hand, when the bit 5 is “1”,
This indicates that the standby base station is unusable, that is, zone selection is not possible.

Further, bit 6 in the non-channel use restriction information field defined in bits 8 to 5 of the sixth byte indicates whether or not position registration is restricted. That is, when the bit 6 is “0”, it indicates that there is no position registration restriction, and when it is “1”, it indicates that there is position registration restriction. Further, bit 5 in the non-channel use restriction information field indicates whether or not transmission is restricted. That is, when the bit 5 is "0", it indicates that there is no transmission restriction, and when it is "1", it indicates that there is transmission restriction.

FIG. 6 shows the format of the second system notification information. The country code field defined in the second and third bytes indicates a country code. If the country code in the second system broadcast information does not match the country code registered in the cordless telephone, the cordless telephone cannot be used.

Next, details of the base station standby processing performed by the cordless telephone will be described with reference to flowcharts shown in FIGS.

When a standby request is issued from the system control unit 100, the wireless control unit 102 searches for a base station (step S10). That is, the wireless control unit 102 transmits the conditions for base station search, such as the frequency, the ID information of the base station, and the number of acquisitions, to the wireless unit 14 via the baseband unit 13.
Set to. Thereby, the radio unit 14 searches for a base station that satisfies the set conditions.

Next, it is checked whether a base station exists (step S11). That is, the wireless unit 14 in which the above conditions are set searches for a base station, and if no base station that matches the conditions is found, notifies the wireless control unit 102 of the information to that effect. The wireless control unit 102 notifies this information to the system control unit as a part of the base station information. The system control unit 100 determines whether there is a base station that satisfies the above condition based on the base station information.

If it is determined in step S11 that there is no base station, one of the out-of-service waiting messages
Is displayed on the LCD device 18 (step S12). That is, the system control unit 1
00 displays a request to display a “CS No” message on the LCD
Notify the display control unit 101. The LCD display control unit 101 that has received the display request generates display data representing “CS Pear” and supplies the display data to the LCD device 18. The operation of the system control unit 100 is the same when displaying other messages described below. With this, LCD
For example, a message as shown in FIG.

On the other hand, if it is determined in step S11 that a base station is present, the system control unit 100 acquires broadcast information (step S13). That is,
When the base station search finds a base station that satisfies the above condition, the radio unit 14 performs a standby process for the searched base station, and provides the broadcast information obtained at the time of the standby process. Is notified to the wireless control unit 102. The wireless control unit 102 notifies the system control unit 100 of the broadcast information as another part of the base station information. In step S13, the notification information sent from the wireless control unit 102 is obtained.

The amount of broadcast information obtained in step S13 is determined by the contents of the broadcast state indication field of the wireless channel broadcast information. That is, if bit 4 of the broadcast status indication field is "1", system broadcast information is further acquired, and if bit 5 of the broadcast status indication field is "1", second system broadcast information is further acquired. .

Next, notification information processing based on the obtained notification information is performed (step S14). Details of this notification information processing are shown in the flowchart of FIG. In the broadcast information processing, first, it is checked whether the base station is usable (step S20). This is performed by checking bit 5 of the CS information field of the system broadcast information.

Here, the base station cannot be used, that is, CS
If it is determined that bit 5 of the information field is “1”, one of the messages waiting for out-of-service “C”
A message "S SHIFUKA" is displayed on the LCD device 18 (step S21). A display example of the message in this case is shown in FIG. Thereafter, the sequence returns from the notification information processing routine to the base station standby processing routine.

If it is determined in step S20 that the base station can be used, it is then checked whether or not location registration is being restricted (step S22). this is,
This is performed by checking bit 6 of the wireless channel use restriction information field of the system broadcast information.

If it is determined that the location registration is being restricted, that is, the bit 6 of the radio channel use restriction information field is "1", one of the in-range waiting messages, "PHS POSITION" Is displayed on the LCD device 18 (step S23). FIG. 11C shows a display example of a message in this case. Thereafter, the sequence returns from the notification information processing routine to the base station standby processing routine.

If it is determined in step S22 that the location registration is not being restricted, then it is checked whether the transmission is being restricted (step S24). This is performed by examining bit 5 of the radio channel use restriction information field of the system broadcast information.

If it is determined that transmission is being restricted, that is, bit 5 of the wireless channel use restriction information field is "1", a "PHS hashing" message, which is one of the area waiting messages, is transmitted. LCD
It is displayed on the device 18 (step S25). A display example of a message in this case is shown in FIG. Thereafter, the sequence returns from the notification information processing routine to the base station standby processing routine.

If it is determined in step S24 that the transmission is not being restricted, it is then checked whether or not the country codes match (step S26). This is the country code of the second system broadcast information and the ROM of this cordless telephone.
This is performed by checking whether or not the country code stored in 11 is the same.

If it is determined that the country codes do not match, a message "Kunibangou Switch", which is one of the out-of-service waiting messages, is displayed on the LCD device 18 (step S27). A display example of a message in this case is shown in FIG. Thereafter, the sequence returns from the notification information processing routine to the base station standby processing routine. If it is determined in step S26 that the country codes match, the broadcast information is recognized to be normal, and the sequence returns from the broadcast information processing routine to the base station standby processing routine.

In the base station standby processing routine, it is checked whether or not location registration is necessary (step S15). This is to determine whether the area number included in the information sent from the standby base station matches the area number obtained in the previous location registration (stored in a predetermined area of the RAM 12). This is done by:

Here, when it is determined that the position registration is not necessary, a normal display is performed (step S16). FIG. 10 shows a display example of the message in this case. Thus, the base station standby processing is completed.

On the other hand, if it is determined in step S15 that location registration is necessary, location registration processing is performed (step S17). This location registration process is well known. Next, it is checked whether the location registration has been completed normally (step S18). This is performed by checking whether or not information indicating that the location registration has been normally completed has been received from the standby base station. Here, when it is determined that the position registration has been completed normally, the sequence branches to step S16, and the above-described normal display is performed.

On the other hand, if it is determined in step S18 that the location registration has not been completed normally, a location registration error analysis process is performed (step S19). Details of the location registration error analysis processing are shown in the flowchart of FIG.

In the location registration error analysis processing, first, it is checked whether or not there is a radio abnormality (step S30).
This is determined by checking whether wireless communication can be normally performed between the cordless telephone and the base station. Here, when it is determined that the wireless communication is abnormal, a message of “PHS Ichiokurokusensen NG”, which is one of the waiting messages in the area, is displayed on the LCD device 18 (step S31). A display example of the message in this case is shown in FIG.

If it is determined in step S30 that there is no wireless abnormality, then it is checked whether or not location registration retry is possible (step S32). This is performed by checking whether or not a retry-possible location registration reject message has been returned from the base station in response to the location registration request. Here, when it is determined that the location registration retry is possible, the message “PHS Ichitouro retry”, which is one of the waiting messages in the area, is set to L.
The information is displayed on the CD device 18 (step S33). FIG. 11B shows a display example of the message in this case.

If it is determined in step S32 that the location registration retry is not possible, then it is checked whether the location registration retry is not possible (step S34).
This is performed by checking whether or not the base station has returned a position registration rejection message indicating that a retry cannot be performed in response to the position registration request. Here, if it is determined that the location registration retry is impossible, the message of “Retryer”, which is one of the out-of-service waiting messages, is sent to the LC.
It is displayed on the D device 18 (step S35). A display example of the message in this case is shown in FIG. If it is determined in step S34 that the location registration retry is not possible, the location registration error analysis processing ends without displaying any message.

In the above-described embodiment, various messages are displayed when the base station stands by. However, messages are displayed when the transmission / reception or handover fails and provided for the user's convenience. You can also.

That is, the cordless telephone transmits a link channel establishment request to the base station when making and receiving a call. In response to the link channel establishment request, the base station may notify the link channel rejection (no available channel). In this case, for example, “PH” as shown in FIG.
A message of "Saki CH pear" can be displayed on the LCD device 18.

A link channel establishment request is transmitted to the base station at the time of outgoing / incoming calls. If a response cannot be obtained from the base station due to a radio abnormality, or a call disconnection occurs during a call, for example, as shown in FIG. 13B, a message of “MUSIC ERROR” may be displayed on the LCD device 18.

If handover fails during a call, a message such as "handover NG" as shown in FIG. 13C may be displayed on the LCD device 18. According to these configurations, the user can know the reason why the call cannot be made.

In addition to the above, when the call origination / reception and recall are failed due to the notification of the rejection of the link channel allocation and the communication returns to the standby state within the area, all the slots of the base station are in use, there is no unoccupied line on the wire side, There is congestion regulation, etc. Also,
When the outgoing / incoming call and re-calling fail due to the notification of the rejection of the link channel assignment and the mobile station goes out of service area, the LCH type mismatch, the LCH protocol mismatch, the extended LCH protocol mismatch, the CC protocol mismatch, the base station cannot be used (zone selection) Not possible), RT / MM protocol version mismatch, etc.

Even when such a condition occurs, a message corresponding to each cause can be displayed on the LCD device 18. According to this configuration, the user can know the cause of the failure at the time of outgoing / incoming call or recalling, so that it is possible to cope with the cause.

As described above, according to this embodiment, information on the base station that is in standby is displayed. If the cordless telephone cannot be used at the current location, the user moves to a location where the cordless telephone can be used. Such a measure can be taken. Further, for example, when the user is in a place where a call cannot be received, it is possible to notify the other party that the call cannot be received or to set the answering machine. By obtaining information such as when the cordless telephone cannot be used temporarily, the cordless telephone can be used effectively.

Further, the operation of the cordless telephone can be grasped during the test of the cordless telephone. For example, if location registration rejection (retry is impossible) is notified in location registration during an incoming call or location registration immediately after a failure in re-calling between paging areas, the out-of-service area is displayed. (Retrifica) is displayed, so you can know the reason why you are out of service area. In addition, it is possible to quickly know the reason why the call cannot be made or received, so that the problem can be solved efficiently.

[0076]

As described in detail above, according to the present invention,
It is possible to provide a mobile terminal device capable of knowing a detailed cause of a failure that has occurred in a mobile communication system and effectively dealing with the failure, and a message display method thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a mobile communication system to which a cordless telephone according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing an electrical configuration of a cordless telephone used in the mobile communication system shown in FIG.

FIG. 3 is a functional block diagram showing a functional configuration of a control unit of the cordless telephone shown in FIG.

FIG. 4 is a diagram showing a format of wireless channel broadcast information from a base station used in the cordless telephone according to the embodiment of the present invention.

FIG. 5 is a diagram showing a format of system broadcast information from a base station used in the cordless telephone according to the embodiment of the present invention.

FIG. 6 is a diagram showing a format of second system broadcast information from a base station used in the cordless telephone according to the embodiment of the present invention.

FIG. 7 is a flowchart showing an operation of the cordless telephone according to the embodiment of the present invention for waiting for a base station.

FIG. 8 is a flowchart showing the notification information processing shown in FIG. 7;

FIG. 9 is a flowchart showing a location registration error analysis process shown in FIG. 7;

FIG. 10 is an example of a message displayed when the cordless telephone according to the embodiment of the present invention is in a normal standby state.

FIG. 11 is an example of a message displayed when the cordless telephone according to the embodiment of the present invention is in an abnormal standby state.

FIG. 12 is an example of a message shown when the cordless telephone according to the embodiment of the present invention is in an out-of-service standby state.

FIG. 13 is an example of a message shown when a cordless telephone according to another embodiment of the present invention is in an abnormal state.

[Explanation of symbols]

1 the base station 2 ₁ to 2 _n mobile station (cordless telephone) 10 control unit 11 ROM 12 RAM 13 baseband section 14 radio unit 15 antenna 16 Microphone 17 Receiver 18 LCD device 19 key 20 LED 21 vibrator 22 sounder 100 system control section 101 LCD display control unit 102 Wireless control unit

Claims (10)

[Claims] 1. A mobile terminal device constituting a mobile communication system, comprising: receiving means for receiving broadcast information indicating an abnormal state transmitted from a base station of the mobile communication system; A mobile terminal device, comprising: analysis means for analyzing broadcast information; and a display unit for displaying a message indicating the abnormal state in accordance with an analysis result by the analysis means. 2. The mobile terminal device according to claim 1, wherein said analyzing means analyzes an abnormal state based on the broadcast information received by said receiving means at the time of standby. 3. The mobile terminal device according to claim 1, wherein said analyzing means analyzes an abnormal state based on the broadcast information received by said receiving means when transmitting or receiving. 4. The mobile terminal device according to claim 1, wherein said analyzing means analyzes an abnormal state at the time of handover based on the broadcast information received by said receiving means. 5. A mobile terminal device constituting a mobile communication system, comprising: detection means for detecting an abnormality in radio transmission and reception performed with a base station of the mobile communication system; and information detected by the detection means. And a display unit for displaying a message indicating the abnormal state according to a result of the analysis by the analyzing unit. 6. A message display method for a mobile terminal device constituting a mobile communication system, comprising: receiving broadcast information indicating an abnormal state sent from a base station of the mobile communication system; And displaying a message indicating the abnormal state according to a result of the analysis. 7. The method according to claim 6, wherein the step of analyzing the broadcast information analyzes an abnormal state based on the received broadcast information during standby. 8. The method according to claim 6, wherein the step of analyzing the broadcast information analyzes an abnormal state based on the received broadcast information at the time of transmission or reception. 9. The method according to claim 6, wherein the step of analyzing the broadcast information analyzes an abnormal state based on the broadcast information received at the time of handover. 10. A message display method for a mobile terminal device constituting a mobile communication system, comprising: detecting an abnormality in radio transmission / reception performed with a base station of the mobile communication system; and analyzing the detected information. And displaying a message indicating the abnormal state according to the analysis result.