JP2003009231A - Radio communication system and radio communication service - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent tapping. SOLUTION: A plurality of temporary numbers are stored in an HLR, and any temporary number (TMPj) among the plurality of temporary numbers is assigned to corresponding radio communication equipment 1. After the temporary number is assigned, the radio communication equipment 1 performs communication with an MSID corresponding to the temporary number TMPj and returns to a normal telephone number TNk after the communication is finished. As a result, tapping can be prevented even when a telephone number or an MSID is leaked to a third person.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system and a wireless communication service.

[0002]

2. Description of the Related Art Conventional analog radio communication systems, such as police radio systems and mobile communication systems, are relatively easy to eavesdrop, so that leakage of communication contents has been a serious problem.

On the other hand, PD, which is the current mobile communication system
C (Personal Digital Cellul
ar) has adopted a digital method, and the possibility of eavesdropping has dramatically decreased.

In the PDC, the identification number MSID in the protocol is set in correspondence with the telephone number of each mobile station. The MSID is an 11-digit, 44-bit code uniquely determined from a telephone number by a predetermined function.

Even in the PDC, if the MSID is known, it is possible to eavesdrop on the communication. Looking at the situation where the same number is continuously used for a long time as in the present situation, the possibility of an eavesdropping event cannot be denied.

On the other hand, a radio paging system (paging system, pager (registered trademark)) capable of sending a short text message is the system covering the widest area in mobile communication. The service area of the wireless calling system generally starts from regional services on a prefectural unit basis, and wide-area services, multi-area services, and other wide-area services are provided. In the service area of the radio paging system, one radio paging central station and a plurality of radio paging base stations are usually arranged. When the caller dials the calling number of the radio pager (pager receiver), the caller is connected to the radio pager in the radio pager and the radio pager is entered with an address signal that identifies the corresponding pager receiver. Send a message signal to each radio calling base station. The signal sent to each radio calling base station is converted into a radio signal and simultaneously transmitted from each station at the same radio frequency. If the pager receiver has its own address signal in the received selective calling signal, it rings and decodes the message signal to display the content.

In addition, intermittent reception is performed in order to reduce the power consumption of the receiver, and in the radio paging system, a high intermittent reception ratio is realized and the power consumption is extremely low.

However, due to the rapid spread of the cellular system, the number of users of the radio paging system has been drastically reduced in recent years, and its infrastructure has not been effectively used.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless communication system and wireless communication service capable of preventing wiretapping.

[0010]

A radio communication system according to the present invention has a function of a control station of a cellular system and a function of a central station of a radio calling system, and its position when a radio for a cellular system communicates. It has a control station for registering information, a base station for a cellular system, a base station for a radio calling system, and a plurality of mobile radio communication devices equipped with a radio for the cellular system and a receiver for the radio calling system. , A unique number is set to each of the cellular system radio and the radio paging system receiver, and the control station, through the radio paging system, a unique number to the cellular system radio of the wireless communication device and Supplies a different temporary number, and the wireless communication device retains this temporary number and communicates using the temporary number. Do. This makes it possible to prevent eavesdropping by making a call using a temporary number even when the unique number is leaked.

In the present invention, the control station supplies the temporary number to the wireless communication device in response to a request from the wireless communication device, or supplies the temporary number to the wireless communication device at a predetermined timing. The former is a temporary wiretapping prevention measure in response to the user's request, and the latter is a continuous wiretapping prevention measure.

In the wireless communication service according to the present invention, a unique number is set in the wireless communication device, and the unique number is temporarily changed appropriately according to the user's request, or a number for specifying the wireless communication device is set. Automatically change in a timely manner. The former is a temporary wiretapping prevention measure in response to the user's request, and the latter is a continuous wiretapping prevention measure.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the wireless communication system according to the present invention will be described with reference to the schematic configuration diagram of FIG. 1 and the block diagram of FIG.

As shown in FIG. 1, a radio communication device (portable terminal) 1 of the present invention comprises a radio paging system receiver (pager receiver) 2, a cellular system radio device (cellular radio device) 3, and The entire wireless communication device 1 is controlled.

A unique pager number PN and telephone TN are set in the pager receiver 2 and the cellular radio 3, respectively, and in this embodiment, in order to prevent eavesdropping, a temporary number is temporarily used instead of the telephone number. Communicate using numbers. The pager system is used exclusively for supplying a temporary number to the wireless communication device 1.

Referring to FIG. 2, the wireless communication device 1 of the present invention.
The configuration will be described in detail.

The signal from the radio calling base station received by the antenna 21 of the pager receiver 2 is supplied to the high frequency amplifier 22.
After being amplified by, it is branched into two and input to the frequency conversion units 23 and 24. A local oscillation signal having a frequency equal to the carrier signal frequency from the oscillator 25 having a phase difference of 90 degrees is supplied to each of the frequency conversion units 23 and 24 from the frequency conversion units 23 and 24. The outputs converted to the baseband of the filters are filters 27 and 28, respectively.
Also, it is input to the demodulator 31 via the limiters 29 and 30 and demodulated. This demodulated signal is received signal processing circuit 32.
When the address signal of its own station is detected,
The message signal is supplied to the control unit 4, and is displayed on the display unit 56 in the case of a normal received message in the paging system. Here,
As the pager receiver 2, the direct conversion type as described above is adopted, but the super heterodyne type may be used.

In the cellular radio 3, the antenna 33
The signal received from the cellular base station is input to the receiving unit 35 via the antenna duplexer 34. Then, after being high-frequency amplified by the high-frequency amplifier 36, the reception mixer 37
Entered in. Then, after being high-frequency amplified by the high-frequency amplifier 36, it is frequency-converted by the local oscillation signal from the frequency synthesizer 40 in the reception mixer 37, and demodulated by the transmission mixer 39 via the intermediate frequency amplifier 38. The demodulated reception signal for the own station is subjected to signal processing by the reception signal processing circuit 42 of the baseband signal processing unit 41 and output to the handset 43 or the display unit 56 via the control unit 4.

On the other hand, the voice signal from the transmitter 44 or the input data from the control unit 4 is input to the transmission unit 46 after being subjected to signal processing in the transmission signal processing circuit 45. That is, the output signal of the transmission signal processing circuit 45 is the modulator 47.
After being subjected to a predetermined modulation process at 1, the signal from the frequency synthesizer 40 is supplied, and then transmitted from the antenna 33 to the cellular base station via the antenna duplexer 34.

In the control unit 4, 50 is a main central processing unit (main CPU) for controlling the entire radio communication device 1 and 5
1 is an RO that stores a control program and predetermined constants
M, 52 are RAMs used as work areas, 53
Is an electrically erasable and writable ROM (EEPRO) such as a flash memory that stores various parameters and tables.
M), 54 are operation unit CPUs that output data to the input keys 55 and the display unit 56, 57 is a pager receiver power control unit that controls power on / off of the pager receiver 2, and 58 is the cellular radio. A cellular radio power control unit for controlling power on / off of the device 3,
The components, the received signal processing circuit 32 of the pager receiver, and the baseband signal processing unit 41 of the cellular radio are connected to each other by a bus 59.

The control unit 4 controls the transmission / reception sequence operation in the pager receiver 2 and the cellular radio 3, the modulation / demodulation of transmission / reception signals, the transmission / reception protocol, and the like.
Processing for displaying the received message of the paging system, information received by the cellular radio or various information for the operator on the display unit 56, various information input from the input key 55 is displayed on the display unit 56 For inputting the data input from the input key 55 to the baseband signal processing unit 41 of the cellular radio device.
To the pager receiver power supply control unit 57 and the cellular radio power supply control unit 58, and other operations of the entire wireless communication device.

Further, the ROM 51 or the EEP
In the ROM 53, a correspondence table between the area of the paging system and each cell (or location registration area) of the cellular system is recorded.

Next, a wireless communication system and a wireless communication service that accommodate the wireless communication device of the present invention will be described.

FIG. 3 is a diagram showing a schematic configuration of the entire wireless communication system for the wireless communication service of the present invention. Figure 3
In the figure, reference numeral 1 is a wireless communication device (portable terminal) of the present invention which incorporates the pager receiver 2 and the cellular wireless device 3 described above.

MSCk, MSCk + 1, MSCk + 2 are control stations, and these control stations have a radio paging central station unit 1 having a function of a central station of a radio paging system (paging).
1k, 11k + 1, 11k + 2 and a cellular system control station unit 12 having a function of a control station in a cellular system
k, 12k + 1 and 12k + 2 are provided respectively. The control stations MSCk, MSCk + 1, MSCk + 2 are shown to represent a plurality of base stations. The control stations MSCk, MSCk + 1, MSCk + 2 correspond to the radio paging system areas Ak, Ak + 1, Ak + 2, respectively, and the control stations MSCk, MSCk + 1, MS.
Ck + 2 is connected to the public network.

Each radio call central station 11k, 11k + 1, 1
Radio call base stations 13k, 13k + 1, 13k + 2 are connected to 1k + 2, respectively.
k, 13k + 1, 13k + 2 are radio calling system areas Ak,
It corresponds to Ak + 1 and Ak + 2, respectively. A plurality of cellular base stations BS are provided in each radio paging system area Ak, Ak + 1, Ak + 2, and each cellular system control station unit 1
2k, 12k + 1, 12k + 2 are a plurality of cellular base stations B in the radio paging system areas Ak, Ak + 1, Ak + 2, respectively.
It is connected to S.

The control stations MSCk, MSCk + 1, and MSCk + 2 register VLR (Visitor) for registering the position of the portable terminal.
Location Register) and HLR (Home Locat) for registering user's accounting information and the like.
Ion Register) is provided, and in the HLR,
As shown in Table 1, a correspondence table of the telephone number (cellular radio device number), pager number (pager reception number) and ID of the mobile terminal 1 is stored for each group of mobile terminals. The VLR and HLR are connected to each other and share information.

[0028]

[Table 1] FIG. 4 is a block diagram showing the contents of the HLR, and Table 1 is a table showing the correspondence between the telephone numbers, pager numbers, and temporary numbers of the wireless communication devices 1.

As shown in Table 1, each wireless communication device 1 is assigned a unique telephone number (for example, TNk) and pager number (PNk), and when each mobile terminal 1 desires a process of preventing wiretapping, it is temporary. A number (eg TMPj) is assigned.

As shown in Table 1 and FIG. 4, a plurality of temporary numbers are stored in the HLR, and one of them (TMPj) is stored in the wireless communication device 1 in response to a request for wiretapping prevention processing. Allocate. Temporary number TMP
After j is assigned, the wireless communication device 1 communicates with the MSID corresponding to the temporary number TMPj,
After the communication is completed, the normal telephone number TNk is restored.

This makes it possible to prevent eavesdropping even when the MSID is leaked to a third party.

Furthermore, by using the cellular system and the paging system together, it is possible to effectively utilize the paging system in which the number of users is drastically reduced.

The wireless communication device 1 includes a PDA having a wireless communication function, an embedded phone and other wireless communication devices having a telephone line, and is not limited to the above configuration.

FIG. 5 shows a wireless communication device 1 having an eavesdropping prevention function.
It is a flowchart which shows the process of.

In FIG. 5, when using the wireless communication device 1, the cellular wireless device 3 is turned on (step S501). As a result, the location registration of the cellular system is performed (step S502).

Here, it is judged whether or not it is within the service area of the pager (step S503), and if it is within the service area (referred to as area Ak), the area of the pager is registered (step S504), and the pager reception 2 is performed. The power is turned on (step S505).

At this time, normally, the control station MSCk sets the temporary number and transmits it to the wireless communication device 1. However, some trouble may occur, so whether the temporary number is received within a predetermined time. It is determined whether or not (step S506).

When the temporary number is received, the temporary number is registered (step S507), and the control station MSCk confirms that the registration is completed through the cellular system.
(Step S508).

Here, the paging system is set in a standby state to save power (step S509) and a call is made (step S510). After the call is completed, the temporary number is deleted (step S511) and the communication is ended (step S512).

On the other hand, when it is determined in step S503 that the pager is out of the service area, and when the temporary number cannot be received within the predetermined time in step S506, a message of wiretapping prevention communication is displayed (step S513), and the normal message is displayed. Communicate (step S51
4). Then, the communication ends (step S512).

FIG. 6 is a flowchart showing the processing of the control station MSCk.

In FIG. 6, when the cellular radio device 3 makes a call (step S601), it is determined whether or not the cellular radio device 3 requires wiretapping prevention communication (step S602). When the wiretapping prevention communication is required, it is determined whether or not the wireless communication device 1 is in the service area of the pager (step S603). When it is in the service area, the temporary number is selected in the HRL and selected. The temporary number is registered in association with the telephone number or the like of the wireless communication device 1 (step S604).

The temporary number is transmitted to the wireless communication apparatus 1 via the pager system (step S605), and then it is determined whether or not there is a notification of the temporary number registration completion from the wireless communication apparatus 1 within a predetermined time (step S60).
6).

When there is a registration completion notification, wiretapping prevention communication is executed (step S607), the registration of the temporary number is deleted after the communication is completed (step S608), and the communication is completed (step S609).

If it is determined in step S602 that eavesdropping prevention communication is not required, it is determined in step S603 that the communication is outside the pager service area, or if there is no registration completion notification in step S606, normal communication is performed (step S61).
0). [Second Embodiment] FIGS. 7 to 9 show the second embodiment, FIG. 7 is a flow chart showing the processing of the wireless communication device, FIG. 8 is a flow chart showing the processing of the control station during a call, and FIG. 9 is the control station. 9 is a flowchart showing a temporary number update process by the.

In the first embodiment, the temporary number is set in response to the request from the wireless communication device 1 to perform the wiretapping prevention communication, but in the second embodiment, the wiretapping prevention communication is always executed. Therefore, the temporary number of the wireless communication device 1 is updated at a predetermined timing. This makes it possible to meet the needs of users who have a high need for wiretapping prevention.

When updating the temporary number, the control station MSCk calls the wireless communication device 1 through the pager system. At this time, the wireless communication device 1 receives the pager signal (FIG. 7, step S701), and turns on the power of the pager receiver 2 (step S702).

Thereafter, it is judged whether or not the temporary number is received within a predetermined time (step S703), and when it is received, the temporary number is registered (step S704).

When the registration is completed, a registration completion notice is transmitted to the control station (step S705), and the paging system is set in the standby state to save power (step S70).
6). Then, a call is made (step S707) and the communication is ended (step S708).

Since the temporary number changes in the wireless communication device 1 which constantly performs wiretapping prevention communication, when another wireless communication device (referred to as a "calling side wireless communication device") tries to make a call, the temporary number changes. On the control station MSCk side, it is possible to make a call between the wireless communication devices based on the correspondence between the telephone number and the temporary number.

In FIG. 8, when the wireless communication device on the calling side makes a call (step S801), the wireless communication device 1 which constantly performs eavesdropping prevention communication from the other party's telephone number.
Or not (step S802).

When the wireless communication device 1 constantly performs wiretapping prevention communication, the temporary number of the other party is extracted in the HLR (step S803), and the control station MSCk and the wireless communication device 1 use the MSID based on the temporary number. Communicates with one-way calling side wireless communication device and control station MSC
Communication with k is performed by MSID based on the telephone number. Then, the communication ends (step S805).

When the other party does not perform wiretapping prevention communication,
Normal communication is performed (step S806).

In FIG. 9, the control station MSCk updates the temporary number of the wireless communication device that constantly performs wiretapping prevention communication when a predetermined time or more has elapsed.

First, the loop counter i for searching the wireless communication device is initialized (step S901), and the time of the last temporary number update of the i-th wireless communication terminal is referred to (step S902). It is determined whether or not a predetermined time has elapsed from the comparison with the current time (step S903), and if the predetermined time has elapsed, a new temporary number is selected (step S904). The selected temporary number is transmitted to the wireless communication device through the pager system (step S905), and it is determined whether or not there is a registration completion notification within a predetermined time (step S906).

When the registration completion notification is given within the predetermined time, the temporary number is also registered in the HLR (step S907), and the loop counter is incremented (step S908).

Next, it is judged whether or not the search for all the wireless communication devices for performing the constant wiretapping prevention communication is completed (step S90).
9) If completed, the process is terminated as it is, and if not completed, the process returns to step S902.

[0058]

According to the present invention, eavesdropping on a wireless communication system can be prevented.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic configuration of a wireless communication device in a first embodiment of a wireless communication system of the present invention.

FIG. 2 is a block diagram showing a configuration example of the wireless communication device of FIG.

FIG. 3 is a block diagram of a wireless communication system according to the first embodiment.

4 is a block diagram showing a configuration of an HLR in the wireless communication system of FIG.

FIG. 5 is a flowchart showing a process of the wireless communication device in the first embodiment.

FIG. 6 is a flowchart showing the processing of the control station in the first embodiment.

FIG. 7 is a flowchart illustrating processing of a wireless communication device according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing a process of a control station in the second embodiment.

FIG. 9 is a flowchart showing processing of updating a temporary number of a control station in the second embodiment.

[Explanation of symbols]

1 wireless communication device (mobile terminal) 2 pager receiver 3 cellular radio 4 control unit MSCk, MSCk + 1, MSCk + 2 control station 11k, 11k + 1, 11k + 2 paging system central station unit 12k, 12k + 1, 12k +2 Cellular system control station 13k, 13k + 1, 13k + 2 Paging system base station BS Cellular system base station

Continued front page    (72) Inventor Yoshiki Ito             3-5-18 Kitazawa, Setagaya-ku, Tokyo Stocks             Company Takatori Ikukai F-term (reference) 5K051 AA04 BB01 BB02 CC07 DD01                       DD15 EE01 EE02 FF01 FF07                       FF21 HH18 HH19 JJ04 KK10                 5K067 AA30 BB02 BB22 DD15 EE02                       EE10 EE16 HH21 HH23 JJ64                       JJ68

Claims (5)

[Claims] 1. A control station which has a function of a control station of a cellular system and a function of a central station of a radio calling system, and which registers position information when a radio for a cellular system communicates, and a base station of the cellular system. A base station of the radio calling system, a plurality of mobile radio communication devices equipped with a radio for the cellular system and a receiver for the radio calling system,
A unique number is set to each of the cellular system radio and the radio paging system receiver, and the control station, through the radio paging system, is a number unique to the cellular system radio of the wireless communication device. A wireless communication system in which different temporary numbers are supplied and the wireless communication device holds the temporary number and communicates with the temporary number. 2. The wireless communication system according to claim 1, wherein the control station supplies the temporary number to the wireless communication device in response to a request from the wireless communication device. 3. The wireless communication system according to claim 1, wherein the control station supplies the temporary number to the wireless communication device at a predetermined timing. 4. A wireless communication service in which a unique number is set for a wireless communication device and the unique number is temporarily changed according to a user's request. 5. A wireless communication service for automatically changing a number for identifying a wireless communication device in a timely manner.