JPH0865736A - Mobile terminal for portable telephone - Google Patents

Abstract

PURPOSE: To recognize the own moving history up to the present time of a person carrying a mobile terminal in unit of simultaneous calling area. CONSTITUTION: The mobile terminal equipped with an automatic position registering function which registers the position of its own station on a base station at every simultaneous calling area stores the simultaneous calling area number of the base station which performs position registration in an information storage part 12 in time series at every execution of the position registration. The simultaneous calling area number stored up to the present time is displayed on a display part 10 in time series corresponding to the operation of a key input operating part 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal for a portable telephone having an automatic position registration function and conforming to the second generation cordless telephone system standard.

[0002]

2. Description of the Related Art A mobile terminal of a simplified mobile phone (hereinafter referred to as PS: Personal Station) conforming to the first generation (RCR STD-28, Radio System Development Center) of the second generation cordless telephone system standard. ) Is a paging area included in the control information that is periodically intermittently transmitted by an outdoor public base station (BS: Base Station) in order to register its own location in the network location information database. The location registration sequence is activated according to the value of the number.

More specifically, as described in Appendix Z "PS Operation with Automatic Location Registration Function" of the above-mentioned second-generation cordless telephone system standard, the PS is turned on or the outside of the service area is moved to within the service area. Upon entering (zone transition between paging areas), a transition is made to a new standby state. At this time, BS periodically receives control information (LCCH: Logical Control Channel superframe) that is intermittently transmitted and synchronization is established. In such a case, the location registration is to be performed when any of the following events or one of them occurs.

Lastly, the location registration acceptance information (business operator identification code, paging area number) of the BS that has succeeded in location registration is not stored.

Location registration acceptance information of the BS that succeeded in location registration at the end (business operator identification code, paging area number)
And the currently synchronized BS carrier identification code and paging area number are different.

The position registration sequence will be described with reference to FIG.

[0007] The PS which has initiated the location registration transmits a link channel establishment request message a to the synchronized BS, and a link channel assignment message b sent from the BS thereafter to advance the location registration sequence. Receives designation of communication channel. The link channel establishment request message a and the link channel allocation message b are SCCH (Signal) which is a functional channel defined in the second generation cordless telephone system standard.
ling Control Channel).

Next, the two parties exchange the synchronization burst c on the communication channel, and the SABM (Set As) from the BS is exchanged.
For ynchronous Balanced Mode, PS is UA (Unnu
mbered Acknowledgment), and then the PS sends a location registration request message d containing the PS number of its own station to the BS. It should be noted that the transmission and reception of various messages after the exchange of the synchronization burst c is performed by the FACCH, which is a functional channel defined in the second-generation cordless telephone system standard.
(Fast Associated Control Channel).

After that, when necessary procedures such as authentication are completed,
A location registration acceptance message e is transmitted from the BS to the PS. After that, the predetermined wireless channel is disconnected between the two, and the position registration is completed.

When the location registration is successful, the PS stores the location registration acceptance information in order to determine whether or not the location registration sequence needs to be activated again thereafter (the location registration activation condition described above). reference). Then, the PS updates the location registration acceptance information every time the location registration operation is performed, and stores only the latest location registration acceptance information.

The BS that has accepted the location registration will register the registered PS number in the location information database of the network. Then, when there is an incoming call to the location-registered PS, the network notifies the BS in the paging area in which the PS registered in the database exists that there is an incoming call to the PS, BS notified from the network
Call the PS.

As described above, P having the automatic position registration function
S can receive an incoming call regardless of the paging area.

[0013]

In recent years, the practical application of a simple mobile phone system (PHS) has been studied, and various usage forms and services have been proposed, one of which is PS. Device tracking using the automatic location registration function that the user has (tracking the person carrying the PS (for example, a person with loitering))
I have a suggestion regarding. This terminal tracking service is PS
It is possible for other people to know in which location (paging area) the person carrying the phone is currently located from the location information (paging area number) currently registered in the network location information database. It is a service that can be done. If the terminal is tracked using this service, it is possible for another person to know the movement history of the person carrying the PS.

However, the person carrying the PS cannot know the history of his actions up to the present. That is, the PS stores only the (latest) position registration acceptance information when the position was last registered, and it is impossible to know the movement history of the PS only from the information.

The terminal tracking function described above is a service mainly provided by the network side. If the network does not provide the service, no one can know the movement history of the person carrying the PS. Can not.

The present invention has been made in view of the above, and an object thereof is a second generation cordless telephone system standard by which a person carrying a PS can confirm his or her movement history up to the present. Mobile phone PS that conforms to the standard
Is to provide.

[0017]

According to a first aspect of the present invention, there is provided a mobile terminal for a mobile telephone, which is a base station for periodically transmitting control information including a paging area number, and a mobile terminal for performing wireless communication with the base station. Is a mobile terminal of a mobile phone compliant with the second-generation cordless telephone system standard, which receives control information sent from a base station and detects changes in the paging area number in the received control information. Each time it does, it is equipped with position registration means for registering its own position with the base station, and in order to solve the above problems, the following means are taken. .

That is, the mobile terminal has a storage area capable of storing a plurality of base station identification information unique to a base station including at least a paging area number, and each time the location registration is performed by the location registration means, A storage unit that stores the base station identification information of the base station that has performed the position registration in time series so that the base station identification information stored so far remains, and the base station identification information stored in the storage unit. And read-out means.

In the mobile terminal of the mobile phone according to the invention of claim 2, in the configuration of the invention of claim 1, the location registration is performed in the base station identification information stored in the storage means every time location registration is performed. It is characterized in that it is provided with a time stamp means for giving time information indicating the time at which the operation was performed.

According to another aspect of the present invention, there is provided a mobile terminal for a mobile phone, comprising: a base station for periodically transmitting control information including base station identification information specific to the base station; and a mobile terminal for performing wireless communication with the base station. A mobile terminal of a mobile phone compliant with the second-generation cordless telephone system standard, which is characterized in that the following means are taken to solve the above problems.

That is, the mobile terminal stores a plurality of base station identification information, which receives the control information sent from the base station and extracts the base station identification information in the received control information. A storage unit having a storage area that can be used, a comparison unit that compares the base station identification information extracted by the base station identification information extraction unit with the latest base station identification information stored in the storage unit, and the storage unit Read-out means for reading out the base station identification information stored in.
Then, the storage means, as a result of the comparison by the comparison means, when the both base station identification information does not match, the base station identification information in the received control information, the base that has been stored so far. The station identification information is stored in time series so that it remains.

[0022]

According to the configuration of the invention of claim 1, each time the location registration is performed by the location registration means, the base station identification information (including at least the paging area number) of the location-registered base station is The data is sequentially stored in the storage means. The location registration by the location registration means is performed when the paging area number in the received control information changes, that is, when the mobile terminal moves between two paging areas.

Then, by reading the base station identification information stored in the storage means by the reading means, the base station identification information of the base station whose location has been registered can be confirmed in a time series. The person carrying the terminal can know his or her movement history up to the present in units of the paging area.

According to the configuration of the invention of claim 2, the time information indicating the time when the location registration is performed is added to the base station identification information stored in the storage means each time the location registration is performed. Therefore, if the base station identification information stored in the storage means is read by the reading means, not only the positional change in the paging area unit of the person carrying the mobile terminal but also the paging area It is also possible to know the time when the zone shifts.

According to the structure of the invention of claim 3, the mobile terminal receives the control information (control carrier) periodically transmitted by the base station, and extracts the base station identification information from the received control information. The extracted base station identification information is compared with the latest base station identification information stored in the storage means. Then, as a result of this comparison, if the above-mentioned base station identification information does not match, that is, if control information is received from a base station different from the base station that previously received the control information, the control received this time The base station identification information in the information is stored in the storage means in time series so that the base station identification information stored until then remains.

When the information stored in the storage means is read by the reading means, the base station identification information of the base station which has sent the control information received by the mobile terminal so far can be confirmed in time series. Therefore, the person carrying the mobile terminal can know his or her movement history up to the present in units of the wireless communication area of the base station (range within which the radio waves of the base station can reach).

[0027]

【Example】

[Embodiment 1] One embodiment of the present invention is shown in FIGS.
The explanation is based on the following.

The simple type portable telephone according to the present embodiment is the first generation (RCR) of the second generation cordless telephone system standard.
It complies with STD-28) and is composed of BS and PS. BS wireless communication area (range within which the radio waves of the BS can reach, usually with a radius of about 100 around the BS)
m-500 m area), a plurality of BSs are scattered, and a paging area is formed by a plurality of BSs assigned the same paging area number.

From each BS, a radio channel information notification message (global definition information commonly defined among BSs in the paging area) including profile data of LCCH downlink superframe and LCCH uplink access timing is transmitted. At the same time, control information (LCCH downlink superframe) is periodically transmitted.

LCCH periodically transmitted from BS
The downlink superframe is a BCCH (Broadcast Contro).
l Channel), SCCH (Signalling Control Channel)
l) and PCH (Paging Channel). FIG. 3 shows the configuration of the control physical slot in which the above-mentioned three functional channels (BCCH, SCCH, PCH) that are LCCH elements are set and the channel coding format of each functional channel.

As shown in FIG. 3A, the control physical slot includes 4-bit R (transient response ramp time), 2-bit SS (start symbol), 62-bit PR (preamble bit), 32-bit UW
(Unique word) and 108-bit CAC (control signal). As shown in FIG.
In the case of (downlink), the CAC includes a 4-bit CI (channel type), a 42-bit originating identification code, a 28-bit destination identification code, and a 34-bit information area I (SCCH). Further, as shown in FIG. 7C, BCCH (downlink)
Alternatively, in the case of PCH (downstream), the CAC includes a 4-bit CI, a 42-bit calling identification code, and a 62-bit information area I (BCCH or PCH). As shown in FIG. 6D, 42 included in common in each functional channel
The bit identification code is a 9-bit business identification code,
A 33-bit outdoor public additional ID, which is an n _P- bit paging area number,
(33-n _P ) bits of additional ID.

As described above, each functional channel (BCCH, SCCH, PCH) which is an LCCH element includes a paging area number. The PS, according to the value of the paging area number included in the control information (LCCH superframe) that the BS periodically transmits,
It has an automatic position registration function for automatically registering the position of its own station to the BS.

As shown in FIG. 2, PS has an antenna 1,
The wireless transmission / reception unit 2, the modulation / demodulation unit 3, the channel codec unit 4, the control unit 5, the voice processing unit 6, the microphone 7 as the handset transmitter, the ear speaker 8 as the handset transmitter, the key input operation unit 9, And a display unit 10.

As shown in FIG. 1, the control section 5 stores a location registration execution section (location registration means) 11 that performs location registration according to the location registration sequence (see FIG. 4) and a plurality of paging area numbers. A BS information storage unit that has a storage area for storing and stores the paging area number in time series so that the information (paging area number) stored up to that time remains every time location registration is completed. (Storage means) 12,
The data extraction unit 13 that extracts the calling identification code from the received control information (LCCH superframe from the BS), the paging area number included in the calling identification code, and the latest broadcasting stored in the BS information storage unit 12. Data analysis unit 1 that determines whether location registration is necessary by comparing with the calling area number
4 and a display control unit (reading means) for reading the paging area number stored in the BS information storage unit 12 and displaying it on the display unit 10 in response to an input operation of the key input operation unit 9.
15 and a time stamp for giving to each paging area number stored in the BS information storage section 12, time information indicating the time when the paging area number is stored (when location registration is performed) Part (time stamp means) 1
6.

The control unit 5 includes a CPU (Central Process).
sing unit) and a microcomputer including a memory, and each of the units 11 to 16 described above stores a predetermined operation program and a memory that stores processing data, and a CPU that executes the operation program in the memory.
It is a functional module of a microcomputer composed of and.

The operation of the PS in the above configuration will be described below.

In FIG. 2, the LCCH signal of the BS received by the antenna 1 and the radio transmission / reception unit 2 is demodulated by the modulation / demodulation unit 3 and input to the channel codec unit 4. The channel codec unit 4 decomposes the input data according to the channel coding format (see FIG. 3), and inputs the information after CI to the control unit 5.

In the control unit 5, as shown in FIG.
The data extraction unit 13 extracts a 42-bit calling identification code (see FIG. 3) from the input data. Then, in the data analysis unit 14, the paging area number included in the calling identification code extracted above and the paging area number stored in the BS information storage unit 12 (the one that was last registered) ) With. As a result, if both paging area numbers are the same, it is determined that location registration is not necessary, and the LCCH signal reception standby state is entered. On the other hand, as a result of the above comparison, when both paging area numbers do not match, the location registration execution unit 11 activates the location registration sequence (see FIG. 4) to perform location registration. This position registration operation is as described above, and its description is omitted here. When the position registration is completed, the paging area numbers at that time are stored in different storage areas of the BS information storage unit 12 so that the storage information stored up to now remains. At this time, the time stamp unit 16 adds time information indicating the time when the location registration is performed to the paging area number.

After that, each time the BS LCCH signal is received, the above operation is repeated. Every time location registration is performed, time information is added to the paging area number at that time, and the location registration is performed in the order in which the location registration is performed. , The paging area number to which the time information is added is stored in the BS information storage unit 12.

The user of the PS can confirm his / her movement history by carrying out a predetermined operation on the key input operation unit 9 after carrying the PS and moving. That is, according to the operation of the key input operation unit 9, the display control unit 15
However, the paging area numbers and the time information stored in the BS information storage unit 12 up to now are read out in the order of storage and displayed on the display unit 10. As a result, the person carrying the PS can confirm his / her current movement history in units of the paging area.

In the above, the display unit 10 included in the PS
The paging area number stored in the BS information storage unit 12 is displayed on the screen of the personal computer, pocket computer, electronic notebook, etc. You may make it display the paging area number as a movement history on a display part. Also, a PS may be externally connected to a printing device to print a paging area number as a movement history. That is, the PS itself does not have a display unit or a display control unit, and the PS has only a unit for reading the stored information in the BS information storage unit 12, outputs the read information to the external connection device, and displays it on the external connection device. Alternatively, the PS may be configured to perform printing. In this case, the PS configuration can be simplified.

Instead of displaying the paging area number as it is on the display unit 10, it is also possible to display the area name corresponding to the paging area number (for example, a representative place name in the area). In this case, a data conversion table for converting the paging area number into an area name is stored in advance in the memory, and the display control unit 15 controls the display according to the data conversion table.

In the above description, the paging area number to which the time information is added is stored in the BS information storage unit 12. However, the paging area number and the additional ID (see FIG. 3) are also stored in the BS information storage unit. It may be stored in 12. The additional ID may have a unique value for each BS in the paging area. In this case, when the input operation for confirming the movement history is performed, if the additional ID is displayed on the display unit 10 together with the paging area number, the wireless communication area of the BS when entering the paging area is specified. It is possible (the position when first entering each paging area can be specified within the wireless communication area of the BS, that is, within a radius of about 100 m to 500 m with the BS as the center). In this case, the paging area number and the additional ID constitute the base station identification information described in the claims.

As described above, the PS of the mobile phone according to the second-generation cordless telephone system standard according to the present embodiment receives the control information sent by the BS, and the paging area in the received control information. Each time a change in number is detected,
Location registration execution unit 11 for registering the location of its own station with the BS
And has a storage area capable of storing a plurality of base station identification information including at least a paging area number, and performs location registration every time location registration is performed by the location registration executing unit 11. BS base station identification information,
A BS information storage unit 12 that stores the base station identification information that has been stored until then in time series, and the BS information storage unit 1
2 is a configuration including a reading unit that reads out the base station identification information stored in No. 2, and this is the first feature.

As a result, the base station identification information (including the paging area number) of the BS whose location has been registered for each paging area can be confirmed in a time series.
The person carrying the can know his or her movement history up to the present in units of the paging area.

Further, in the PS according to the present embodiment, in the configuration of the first characteristic described above, the location registration is performed in the base station identification information stored in the BS information storage unit 12 every time the location registration is performed. The second feature is a configuration including a time stamp unit 16 that adds time information indicating time.

As a result, not only the positional change in the paging area unit of the person carrying the PS but also the time when the zone changes between the paging areas can be known.

Further, the PS according to this embodiment has a display means (display unit 10) for displaying the base station identification information read from the BS information storage unit 12 in the configuration of the first characteristic.
And a display controller 15), which is the third feature.

Thus, the movement history can be quickly confirmed without externally connecting the display device and the printing device.

Further, the PS according to the present embodiment has the data conversion table for converting the paging area number into the area name (place name) in the configuration of the third feature,
The display means, based on the data conversion table,
The paging area number included in the base station identification information read from the BS information storage unit 12 is converted into an area name and displayed, which is a fourth feature.

As a result, the user can easily understand the movement history.

Further, the PS according to the present embodiment has a configuration in which the base station identification information stored in the BS information storage unit 12 is the paging area number and the additional ID in the configuration of the first characteristic. This is the fifth feature.

As a result, at the time of zone transition between paging areas, the intrusion position into a new paging area can be specified in units of the wireless communication area of the BS.

[Embodiment 2] Next, another embodiment of the present invention will be described below mainly with reference to FIGS. 2 and 5. For convenience of explanation, members having the same functions as the members shown in the above-mentioned embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The overall hardware configuration of the PS of the simplified mobile phone according to the first embodiment (RCRSTD-28) of the second generation cordless telephone system standard according to this embodiment is shown in FIG.
The same as Example 1 shown in FIG.

In the first embodiment, the PS sequentially stores the base station identification information each time the location registration is performed (every time zone transition between paging areas). , Base station identification information (including the paging area number as well as the additional ID) each time the PS moves across the wireless communication area of the BS regardless of whether location registration is executed or not Are sequentially stored.

As shown in FIG. 5, the control unit 5 of the PS of this embodiment has a BS information storage unit 12, a data extraction unit (base station identification information extraction means) 13, a data analysis unit 14, and a display control. It has a unit 15, a time stamp unit 16, and a BS information comparing unit (comparing means) 17. Each of the above 12 ~
Reference numeral 17 is a functional module of the control unit 5 including a memory that stores a predetermined operation program and also stores processing data, and a CPU that executes the operation program in the memory.

The BS information storage unit 12 has a storage area for storing a plurality of base station identification information (paging area number and additional ID), and when new base station identification information is stored, the BS information storage unit 12 has already stored the storage area. The information is stored in another storage area in time series so that the stored information remains.

The BS information comparison unit 17 receives the paging area number and the additional ID included in the calling identification code and the B
The BS information storage unit 12 compares the latest paging area number and the additional ID stored in the S information storage unit 12 with each other.
Then, it is determined whether or not to newly store the base station identification information.

The operation of the PS in the above configuration will be described below.

In FIG. 2, the LCCH signal of the BS received by the antenna 1 and the radio transmission / reception unit 2 is demodulated by the modulation / demodulation unit 3 and input to the channel codec unit 4. The channel codec unit 4 decomposes the input data according to the channel coding format (see FIG. 3), and inputs the information after CI to the control unit 5.

In the control section 5, as shown in FIG.
The data extraction unit 13 extracts a 42-bit calling identification code (see FIG. 3) from the input data. Then, the data analysis unit 14 determines whether or not the location registration is necessary, and B
The S information comparison unit 17 compares the paging area number and additional ID included in the calling identification code with the paging area number and additional ID (latest stored information) stored in the BS information storage unit 12. . At this time, if location registration is required, the location registration sequence described above is activated.

As a result of the comparison by the BS information comparison unit 17, if both paging area numbers and additional IDs do not match, the control unit 5 determines that the BS has moved across the wireless communication area of the BS. To do. That is, as described above, the additional ID is a unique value for each BS in the paging area, and even if the paging area number is the same, the additional ID
If it is different, it can be seen that the wireless communication area of the BS is changed and the LCCH signal transmitted from the BS different from the previous one is received. In this case, the LC currently being received
The paging area number and additional ID of the CH signal are stored in different storage areas of the BS information storage unit 12 so that the storage information stored up to now remains. At this time, the time stamp unit 16 adds time information indicating the time at which the storage was performed to the above storage information. On the other hand, as a result of the comparison by the BS information comparison unit 17 described above, when both paging area numbers and additional IDs match, the control unit 5 determines that the PS remains in the wireless communication area of the BS, The paging area number and additional ID of the currently received LCCH signal are not stored.

Thereafter, the above operation is repeated each time the BS LCCH signal is received, and whenever the PS moves across the BS wireless communication area, the LCC received at that time is received.
Time information is added to the paging area number and additional ID of the H signal, and the time information is sequentially stored in the BS information storage unit 12.

The user of the PS can confirm his / her movement history by carrying out a predetermined operation on the key input operation unit 9 after carrying the PS and moving. That is, according to the operation of the key input operation unit 9, the display control unit 15 has been
The paging area number, the additional ID, and the time information stored in the S information storage unit 12 are read out in the stored order and displayed on the display unit 10. As a result, the person carrying the PS can confirm his / her movement history up to the present in units of the wireless communication area of the BS.

As described in the first embodiment, PS
An information processing device or the like may be externally connected to the device, the storage information in the BS information storage unit 12 may be read and output to the external connection device, and the external connection device may display and / or print.
Further, it has a data conversion table for converting the paging area number and the additional ID into the area name corresponding to them, and the display control unit 15 controls the display according to the data conversion table and displays the movement history by the area name. You may do it.

As described above, the PS of the portable telephone according to the second-generation cordless telephone system standard according to the present embodiment receives the control information (LCCH signal) sent by the BS, and receives the control information within the received control information. Data extraction unit 1 for extracting base station identification information (paging area number and additional ID) of
3, the BS information storage unit 12 having a storage area capable of storing a plurality of base station identification information, and the extracted base station identification information and the latest base station identification information stored in the BS information storage unit 12 are compared. The BS information comparing unit 17 and a reading unit for reading the base station identification information stored in the BS information storing unit 12 are provided. When the base station identification information does not match, the base station identification information in the received control information is stored in time series so that the base station identification information stored so far remains. This is the first feature.

As a result, every time the PS moves to the wireless communication area of the BS, the base station identification information peculiar to the BS is stored in time series, and the stored base station identification information can be read out if necessary. Therefore, the person carrying the PS can know his / her movement history up to the present in units of the wireless communication area of the BS.

Further, in the PS according to the present embodiment, in the configuration of the first characteristic, the location registration is performed in the base station identification information stored in the BS information storage unit 12 every time the location registration is performed. The second feature is a configuration including a time stamp unit 16 that adds time information indicating time.

As a result, B of the person carrying the PS
Not only the positional change of S in the wireless communication area unit but also P
It is also possible to know the time when S moves to the wireless communication area of the BS.

Further, the PS according to the present embodiment has the display means (display section 10) for displaying the base station identification information read from the BS information storage section 12 in the configuration of the first characteristic.
And a display controller 15), which is the third feature.

Thus, the movement history can be quickly confirmed without externally connecting the display device and the printing device.

The above-described embodiments are intended to clarify the technical contents of the present invention, and should not be construed in a narrow sense by limiting to such specific examples. Various modifications can be made within the scope of the claims.

[0074]

As described above, the mobile terminal of the mobile phone according to the present invention has a storage area capable of storing a plurality of base station identification information unique to a base station including at least a paging area number. Storage means for storing the base station identification information of the base station for which the location registration is performed every time the location registration means performs the location registration so that the base station identification information stored so far remains in time series; It is configured to include a reading unit that reads the base station identification information stored in the storage unit.

Therefore, the base station identification information (including the paging area number) of the base station that has registered the location for each paging area can be confirmed in time series, so that the mobile terminal can be carried. There is an effect that a person who is present can know his or her movement history up to the present in units of paging areas.

The mobile terminal of the mobile phone according to the invention of claim 2 is
As described above, in the configuration of the invention according to claim 1, a time for adding time information indicating the time when the location registration is performed to the base station identification information stored in the storage unit each time the location registration is performed. This is a configuration including a stamp means.

Therefore, in addition to the effect of the first aspect of the invention, the effect of being able to know the time at the time of zone transition between paging areas is also exhibited.

The mobile terminal of the mobile phone according to the invention of claim 3 is:
As described above, it has the base station identification information extracting means for receiving the control information sent from the base station and extracting the base station identification information in the received control information, and the storage area capable of storing a plurality of base station identification information. A storage unit, a comparison unit for comparing the base station identification information extracted by the base station identification information extraction unit with the latest base station identification information stored in the storage unit, and stored in the storage unit. Read means for reading out the base station identification information, and when the storage means does not match the base station identification information of both as a result of the comparison by the comparison means, the base station identification in the control information received this time The information is stored in time series so that the base station identification information stored so far remains.

Therefore, the base station identification information of the base station that has sent the control information received by the mobile terminal can be confirmed in time series, so that the person carrying the mobile terminal can This has the effect that the movement history up to the present can be known in units of the wireless communication area of the base station.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a block diagram showing a configuration of a main part of a mobile terminal of a simplified mobile phone.

FIG. 2 is a block diagram showing an overall schematic configuration of the mobile terminal.

FIG. 3 Functional channels of the LCCH element (BCCH, SC
FIG. 3 is an explanatory diagram showing a configuration of a control physical slot in which CH, PCH) are set and a channel coding format of each functional channel described above.

FIG. 4 is an explanatory diagram showing a location registration sequence performed between a mobile terminal of a simplified mobile phone and a base station.

FIG. 5 shows another embodiment of the present invention and is a block diagram showing a configuration of a main part of a mobile terminal of a simplified mobile phone.

[Explanation of symbols]

 1 Antenna 2 Radio Transmitter / Receiver 3 Modulator / Demodulator 4 Channel Codec 5 Control 9 Key Input Operation 10 Display 11 Location Registration Execution (Location Registration Means) 12 BS Information Storage (Memory) 13 Data Extraction (Base Station Identification information extraction means) 14 Data analysis section 15 Display control section (reading means) 16 Time stamp section (time stamp means) 17 BS information comparison section (comparison means)

Claims (3)

[Claims] 1. A mobile phone compliant with the second-generation cordless telephone system standard, which comprises a base station that periodically transmits control information including a paging area number and a mobile terminal that wirelessly communicates with the base station. It is a mobile terminal of a telephone and receives the control information sent from the base station, and registers its position with the base station each time a change in the paging area number in the received control information is detected. In a mobile terminal equipped with means, the mobile terminal has a storage area capable of storing a plurality of base station identification information specific to a base station including at least a paging area number, and the location is registered every time the location registration is performed by the location registration means. Storage means for storing the base station identification information of the registered base station in time series so that the base station identification information stored so far remains, and the base station identification information stored in the storage means. Phone mobile terminals, characterized in that it comprises a reading means for reading. 2. A time stamp means for adding time information indicating the time when the location registration is performed to the base station identification information stored in the storage means each time the location registration is performed. The mobile terminal of the mobile phone according to claim 1. 3. A second generation cordless telephone system standard comprising a base station for periodically transmitting control information including base station identification information specific to the base station, and a mobile terminal for performing wireless communication with the base station. A mobile terminal of a mobile phone conforming to the standard, which receives the control information transmitted from the base station and extracts the base station identification information in the received control information, and the base station identification information. A storage means having a storage area capable of storing a plurality of storage areas; a comparison means for comparing the base station identification information extracted by the base station identification information extraction means with the latest base station identification information stored in the storage means; Read means for reading out the base station identification information stored in the storage means, wherein the storage means, when the result of the comparison by the comparison means indicates that both base station identification information do not match, The base station identification information in the received control information, the mobile telephone mobile terminal, characterized by time-sequentially stored so far as the base station identification information stored remains.