JPH05122218A - Data communication system - Google Patents

Abstract

PURPOSE:To reuse the same terminal equipment identification ID and to prevent the illegal use by a reception terminal equipment. CONSTITUTION:The system is a data communication system in which packet communication is implemented between a base station and plural reception terminal equipments and a packet consists of a terminal equipment identification ID corresponding respectively to each reception terminal equipment, a generation code and optional data, and when the reception terminal equipment receives a packet (S21) and a terminal equipment identification ID included in the received packet is coincident with its own terminal equipment identification ID (S22, Yes), the generation code is checked (S23) and when it is discriminated that the generation code of the received packet is dissident with its own generation code (Yes), the reception terminal equipment itself is set to the state of reception disable (S27).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication system for performing packet communication between a base station and a plurality of receiving terminals.

[0002]

2. Description of the Related Art As a conventional data communication system for performing packet communication between a base station and a plurality of receiving terminals, for example, there is a so-called radio call data communication system. The wireless paging data communication system is usually called a paging system. Also,
This paging system also includes, for example, a so-called portable telephone.

A terminal identification ID is normally assigned to each of the plurality of receiving terminals used in such a paging system.

Therefore, the base station which communicates with a plurality of receiving terminals uses the above-mentioned terminal identification ID in the packet to be transmitted.
Is included to notify each receiving terminal of which receiving terminal this transmission packet is addressed to. In other words, each receiving terminal checks the terminal identification ID in the received packet received from the base station to determine whether or not the packet is addressed to itself. Specifically, the receiving terminal examines the terminal identification ID in the received packet and performs processing such as displaying the received packet when the terminal identification ID matches its own terminal identification ID, If they do not match, the packet is discarded and no processing is performed.

[0005]

By the way, for example, when the receiving terminal is lost or stolen and the receiving terminal is lost, the terminal identification ID used for the receiving terminal is lost. Can no longer be used on another new receiving terminal. That is, if the same terminal identification ID as that of the old receiving terminal (the lost receiving terminal) is used for the new receiving terminal, these two receiving terminals will have the same terminal identifying ID, and therefore the new receiving terminal is sent to the new receiving terminal. The packet can be received even by the old receiving terminal. In this case, the information of the person who uses the new receiving terminal may leak to another person (the information of the person who uses the new receiving terminal may leak to the outside because one receiving terminal has a single terminal identification ID). Therefore, conventionally, the same terminal identification ID as that of the lost receiving terminal (old receiving terminal) cannot be used unless the old receiving terminal is collected.

From the above, the terminal identification ID that cannot be used increases every time the receiving terminal is lost, which is not preferable.

Therefore, the present invention has been proposed in view of the above circumstances, and provides a data communication system in which the same terminal identification ID can be reused and a stolen receiving terminal cannot be abused. The purpose is to do.

[0008]

A data communication system of the present invention has been proposed to achieve the above object, and is a data communication system for performing packet communication between a base station and a plurality of receiving terminals. The packet is composed of a terminal identification ID corresponding to each of the plurality of receiving terminals, a generation code indicating the generation of each receiving terminal, and arbitrary data, and when the packet is received, the received packet is If the included terminal identification ID matches with its own terminal identification ID, the generation code is checked next, and if the received generation code does not match with its own generation code by this generation code check, The receiving terminal is set to be unreceivable.

That is, the data communication system of the present invention is suitable for application to a data communication system such as a so-called paging system, and in addition to the terminal identification ID, the terminal identification ID is included in the data packet. By sending the generation code that is changed each time it is reused, the terminal identification ID can be reused and lost even when the receiving terminal is lost or stolen, for example. By also having a means for disabling the function of the receiving terminal, it is possible to prevent the receiving terminal from being abused.

In other words, in the data communication system, in the transmission packet from the base station, at the same time as the terminal identification ID, the generation code to be changed due to the reuse of the terminal identification ID is sent, and the receiving terminal which receives this code is In addition to the above, the generation code is checked, and if the received terminal identification ID and generation code both match the own terminal identification ID and generation code, data (arbitrary data included in the received packet) is displayed. If it does not match (if the terminal identification IDs match and the generation codes do not match), take measures to prevent future data reception (measures against abuse). Then, the terminal identification ID used for the lost receiving terminal can be reused.

[0011]

According to the data communication system of the present invention, a terminal identification ID for a packet corresponding to each of a plurality of receiving terminals is provided.
And a generation code and arbitrary data. Even if the terminal identification ID included in the received packet matches the terminal identification ID of its own, if the generation code does not match its own generation code, this Since the receiving terminal is set to be unreceivable, even if the terminal identification ID used for the lost receiving terminal is reused, no information leaks to the lost receiving terminal.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the data communication system of the present embodiment is a data communication in which packet communication is performed between a base station BS and a plurality of receiving terminals (receiving terminals TM ₁ and TM _{2 in} this embodiment). In the system, as shown in FIG. 2, the packet includes a terminal identification ID corresponding to each of the plurality of receiving terminals TM ₁ and TM ₂ , a generation code indicating the generation of each receiving terminal TM ₁ and TM ₂ , and an arbitrary code. Composed of data and
When the receiving terminals TM ₁ and TM ₂ receive the packet in step S21 as shown in FIG.
If the terminal identification ID included in the received packet matches the own terminal identification ID in 22 (Yes), then the generation code is checked (step S23),
If it is determined in step S23 that the generation code of the received packet and its own generation code do not match (Yes), the receiving terminal itself is set to be unreceivable. The receiving terminals are not limited to the two terminals TM ₁ and TM ₂ as shown in FIG.

That is, in the data communication system configuration of FIG. 1, for example, the receiving terminal TM ₁ and the receiving terminal TM ₂
, The base station BS includes the terminal identification ID corresponding to any one of the terminal identification IDs corresponding to the respective receiving terminals TM ₁ and TM _{2 in} the packet to be transmitted. Each receiving terminal is notified of the receiving terminal to which this transmission packet is transmitted.

On the other hand, each of the receiving terminals TM ₁ and TM ₂ checks the above-mentioned terminal identification ID in the received packet and, if it matches with its own terminal identification ID, performs processing such as displaying the packet. If they do not match, the packet is discarded and no processing is performed.

Further, as shown in FIG. 2, in addition to the terminal identification ID corresponding to the receiving terminal of the other party to be transmitted, the generation code of this receiving terminal is also sent to the packet sent from the base station BS at the same time. ing.

When the receiving terminal is lost, for example, this generation code assigns the terminal identification ID corresponding to the receiving terminal (old lost receiving terminal) to another receiving terminal (for example, the owner of the old receiving terminal). New receiving terminal, etc.), and when the receiving terminal is lost, for example, the generation code given to the old receiving terminal is changed to another receiving terminal (new Receiving terminal etc.)
It will be changed according to. In other words, this generation code is rewritten every time the same terminal identification ID is used by another receiving terminal. This generation code needs to have at least 1 bit, but as the number of bits increases, it takes more time for the generation code number and the like to make one round, so it is preferable to increase the number of bits.

In the receiving terminal which receives the packet composed of the terminal identification ID, the generation code and the arbitrary data as described above, the processing of the flowchart as shown in FIG. 3 is performed.

That is, in FIG. 3, when the receiving terminal receives the packet from the base station BS in step S21, the terminal identifying ID in the received packet matches with its own terminal identifying ID in step S22. Check whether or not.

When it is determined in step S22 that the terminal identification ID of the received packet does not match its own terminal identification ID (No), the received packet is a packet addressed to another unit (receiving terminal). Therefore, the process proceeds to step S25 and ends the process without doing anything.

When it is determined in step S22 that the terminal identification ID of the received packet and its own terminal identification ID match (Yes), the process proceeds to step S23, and the received packet is received in step S23. Check whether or not the generation code included in is in agreement with its own generation code.

If it is determined in step S23 that the generation code included in the received packet matches its own generation code (Yes), step S2
After proceeding to step 4 and performing necessary processing such as display and alarm of the contents of the arbitrary data part included in the received packet, the procedure proceeds to step S25 to end the processing.

When it is determined in step S23 that the generation code included in the received packet does not match its own generation code (No), the user (reception terminal) is no longer the service target. Therefore, in step S27, processing that cannot be received thereafter is performed.

The process in step S27 is as follows.
For example, the terminal identification ID written in the memory in the receiving terminal may be rewritten to an invalid one, or a flag for stopping the function of the receiver of the receiving terminal may be provided in this memory to disable it. A method of setting to the state may be considered, but any method may be used.

It should be noted that, for example, if the above-mentioned terminal identification ID is lengthened by the addition of the generation code, the number of terminal identification IDs can be increased. In this case, as described above, the number of terminal identification IDs will be sufficient even if the terminal identification IDs are not reused, so there is an idea that the above-mentioned conventional problems will be eliminated. On the other hand, in the present embodiment, it is possible to reuse the terminal identification ID by the generation code and disable the function when the lost receiving terminal is illegally used.

FIG. 4 shows a block circuit diagram of the receiving terminal of this embodiment.

In FIG. 4, the signal received by the antenna 1 is demodulated by the receiver 2 and received by the controller 3 as received data.
Sent to. The control unit 3 compares the terminal identification ID (own terminal identification ID) stored in the non-volatile memory 4 with the terminal identification ID in the received packet, and if these terminal identification IDs match, the above The data in the received packet is sent to the display device 5 in order to display arbitrary data included in the received packet. The display device 5 is a display device such as a liquid crystal display.

Further, the terminal identification ID and the generation code are written in the non-volatile memory 4, and the control unit 3 uses the generation code and the generation code in the received packet as described above. Check at the same time. If there is a mismatch in the generation code check, the control unit 3 rewrites the terminal identification ID written in the non-volatile memory 4 to an invalid one, as described above, or in advance. A flag for stopping the function of the receiver 2 of the receiving terminal held in the non-volatile memory 4 is used to set the receiver 2 in the disabled state.

Further, in the receiving terminal of this embodiment, the input unit 6
For example, a switch or the like is provided so that various functions can be selected and an alarm can be stopped. The input unit 6 is connected to the control unit 3.

As described above, in the data communication system of the present embodiment, since the generation code is prepared, the same terminal identification ID can be reused, and the receiving terminal stolen or stolen, for example, can be misused. However, it is possible to prevent the abuse by disabling the function of the receiving terminal itself because the generation code is different.

[0031]

As described above, in the data communication system of the present invention, a packet is composed of a terminal identification ID corresponding to each of a plurality of receiving terminals, a generation code, and arbitrary data. If the terminal identification ID included in the received packet matches the terminal identification ID of its own when the packet is received, the above generation code is checked next, and the generation code received by this generation code check is If the receiving terminal itself is set to be unreceivable if the generation code does not match, the same terminal identification ID can be reused, and the stolen receiving terminal can be prevented from being abused.

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration of a data communication system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a format of a transmission packet in the data communication system according to the embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the receiving terminal of the data communication system according to the embodiment of the present invention.

FIG. 4 is a block circuit diagram showing a schematic configuration of a receiving terminal of the data communication system according to the embodiment of the present invention.

[Explanation of symbols]

TM ₁ , TM ₂・ ・ ・ Receiving terminal BS ・ ・ ・ ・ ・ ・ Base station 1 ・ ・ ・ ・ ・ ・ ・ Antenna 2 ・ ・ ・ ・ ・ ・ ・ Receiver 3 ・ ・ ・ ・ ・・ ・ ・ Control unit 4 ・ ・ ・ ・ ・ ・ Non-volatile memory 5 ・ ・ ・ ・ ・ ・ ・ Display unit 6 ・ ・ ・ ・ ・ ・ ・ Input unit

Claims (1)

[Claims] 1. A data communication system for performing packet communication between a base station and a plurality of receiving terminals, wherein a packet represents terminal identification information corresponding to each of the plurality of receiving terminals and a generation of each receiving terminal. If the receiving terminal receives the packet and the terminal identification information included in the received packet matches its own terminal identification information, the receiving terminal is composed of a generation code and arbitrary data. A data communication system, wherein a generation code is checked, and if the generation code does not match its own generation code, the receiving terminal is set to be unreceivable.