JP2001313728A - Radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent access from an incorrect terminal and to discrimi nate the eligibility of a communication destination by short-time communication in a radio communication system. SOLUTION: When a power metering control part 15 of each of radio terminal devices (A) 2 to (D) 5 collects and transmits data outputted from a connected power meter part 14, it outputs a transceiver telephone number or a public telephone number and a PS-ID to a PHS communication part 16 to transmit this data, and at the time of incoming, it returns a response through the PHS communication part 16 so as to connect a line to the radio terminal device on the originating side if a PS D received through the PHS communication part 16 coincides with one of stored discrimination codes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication system for performing communication by radio signals between a plurality of radio terminals.

[0002]

2. Description of the Related Art For example, an electric power meter is installed in a building such as a house, and measures the power consumption of the house or the like by integrating it. Since there are a large number of such power meters, it is not easy to collect the meter readings of each meter one by one. Therefore, PHS (Personal Hand
Yphone System) Constructs a wireless terminal device equipped with a communication unit, automatically collects meter reading data of the power meter periodically, and transmits the collected data via the PHS communication unit to facilitate data collection. Communication systems have been devised.

[0003] In this case, the collected data is transferred between wireless terminal devices or the like. When a communication line is established between the calling terminal and the called terminal, the called terminal uses the calling number of the calling terminal (ie, the calling number). , Public or private line phone numbers,
The originating terminal is authenticated by referring to the telephone number for direct communication between slave units).

[0004]

However, the telephone number for the public line may be illegally acquired, and the line may be illegally connected from another terminal which is not originally a communication target. In addition, since the telephone number for direct communication between slave units is limited in number, there is a possibility that the telephone number may happen to coincide with the telephone number of another terminal device constituting the communication system. Unauthorized access to the system is made.

[0005] Furthermore, it is conceivable to perform authentication by sending a predetermined password after connecting the communication line once. In that case, however, the line must be connected once, so that an unauthorized terminal accesses the terminal. If there is, there is a problem that a communication line is unnecessarily connected as a result.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent access from an unauthorized terminal more reliably and to improve the eligibility of a communication partner without connecting a line. An object of the present invention is to provide a wireless communication system capable of making a determination.

[0007]

According to the wireless communication system of the present invention, each wireless terminal device stores a line connection call number and a unique identification code assigned to itself. At the same time, it stores at least an identification code other than its own assigned to a wireless terminal device other than itself. At the time of calling, at least the unique identification code assigned to the calling side wireless terminal device itself is transmitted, and the called side wireless terminal device stores the identification code of the calling side wireless terminal device received at the time of the incoming call. If one of the identification codes matches, the line connection with the transmitting-side wireless terminal device is performed.

That is, by judging whether or not a communication partner is qualified by using an identification code given independently of a call number for line connection, confidentiality is improved, and access from an unauthorized terminal is ensured. Can be prevented. Therefore, the security of the system can be enhanced.
Further, since the eligibility of the communication partner can be determined by collating the identification code transmitted before the line connection is made, useless line connection can be eliminated.

According to the wireless communication system of the present invention, each wireless terminal device stores a call number for line connection assigned to itself and a unique identification code, and wireless terminals other than itself. A pair of a calling number other than the own and an identification code other than the own assigned to the terminal device is stored. At the time of outgoing call, a call number for line connection and a unique identification code allocated to the calling side wireless terminal device itself are transmitted, and the called side wireless terminal device receives the called side wireless terminal device at the time of incoming call. When both the call number assigned to the device itself and the unique identification code match one of the stored pairs other than the device itself, a line connection with the originating wireless terminal device is performed.

That is, an appropriate pair of a calling number and an identification code of a communication partner is stored in advance, and the receiving-side wireless terminal device stores the pair of the calling number and the identification code of the calling side received at the time of the incoming call. By performing line connection with the calling side when one of the information is matched, access from an unauthorized terminal can be more reliably prevented.

According to the third aspect of the present invention, when a signal is received from the transmitting-side wireless terminal device, the wireless terminal device receives the identification code of the transmitting-side wireless terminal device via the communication unit. Is determined in the control unit to match at least one of the other identification codes stored in the storage means. Then, when the two match, the control unit controls the communication unit to perform a line connection with the wireless terminal device on the calling side.

That is, the communication unit and the control unit are separated from each other, and the control unit determines the identification code which is not required in normal wireless communication. it can.

According to the fourth aspect of the present invention, the communication unit and the control unit of the wireless terminal device are housed in separate cases and formed separately, and the control unit is connected to the communication unit by wiring. That is, since the communication unit and the control unit are housed in different cases and are completely separated from each other, the configuration of the communication unit can be made as common as possible.

According to the wireless communication system of the fifth aspect, when the control unit controls the communication unit so as to establish a line connection with the wireless terminal device on the transmitting side, the wireless terminal device on the transmitting side is stored in the storage unit in the communication unit. Are stored. Then, when a signal from the transmitting-side wireless terminal device is received again within a predetermined time from the control, the communication unit transmits the identification code of the transmitting-side wireless terminal device to the identification code stored in the internal storage means. It is determined whether or not they match at least one of the codes, and if they match, the line connection for re-incoming with the originating wireless terminal device is performed without control from the control unit.

That is, for a wireless terminal device whose identification code has been confirmed once and is determined to be qualified as a communication partner, it is expected that incoming calls will continue to occur to some extent thereafter. It is not necessary to repeat the confirmation procedure. Therefore, when the communication unit receives the call number stored in the storage unit again from the wireless terminal device, the communication unit connects the line during the predetermined time without control such as a response instruction from the control unit. In addition, the security can be ensured, and the response time can be shortened to connect the line earlier.

When the communication unit is controlled by the control unit to establish a line connection with the transmitting-side wireless terminal device, the communication unit stores the identification code of the transmitting-side wireless terminal device in the internal storage means. Thereafter, even if the connection of the line fails, the identification code of the transmitting-side wireless terminal device is retained in the communication unit. Therefore, when there is an incoming call from the wireless terminal device again, the communication unit can determine that the incoming call is from the wireless terminal device that has received an incoming call in the past at that point in time. Connection can be made early.

According to the wireless communication system of the present invention, when the control unit controls the communication unit so as to establish a line connection with the wireless terminal device on the transmission side, the control unit transmits at least the outgoing call to the storage unit in the communication unit. The identification code of the wireless terminal device on the side is stored. That is, the process of storing the identification code in the storage unit in the communication unit is performed based on an instruction from the control unit, so that the configuration of the communication unit can be more easily generalized.

According to the wireless communication system of the present invention, when transmission and reception are performed between the wireless terminal devices, each of the wireless terminal devices is connected to a wireless line between each of the nearby wireless base stations and the wireless base station. Communication is performed via the line of the ISDN network between the stations. A subaddress field is set in each communication line, and the wireless terminal device transmits a unique identification code assigned to itself using the subaddress field at the time of calling.

That is, each wireless terminal device is provided with a wireless channel between each wireless base station in the vicinity and an ISDN between the wireless base stations.
By performing communication via a network line, remote communication becomes possible. Then, by transmitting the unique identification code using the subaddress field, the identification code can be transmitted using the existing communication protocol as it is.

According to the wireless communication system of the present invention, when transmission / reception is performed between the respective wireless terminal devices, the communication is performed using the direct communication between the mobile terminals between the respective wireless terminal devices. Can be reduced.

According to the wireless communication system of the ninth aspect, each wireless terminal device includes a PHS communication unit as a communication unit, and uses a PS-ID assigned to the PHS communication unit as a unique identification code. Used. That is, the PHS communication unit is suitable for both direct communication between child devices and communication performed via the base station, and can perform communication using an existing system (equipment) for PHS communication.

Further, the PS-ID is a code uniquely assigned to all the PHS communication units, and thus is optimal as an identification code for judging the eligibility of a communication partner. Since there is no need to secure an extra data area or the like for transmitting the identification code, communication using the identification code can be easily realized.

According to the wireless communication system of the tenth aspect, a data output device for outputting data to each wireless terminal device is provided, and the wireless terminal device transmits data output by the data output device. That is, as the data output device, for example, a vending machine, a watt-hour meter or a gas meter, or a machine tool device that operates on a production line of a factory or the like can be considered. Since a relatively large number of these are installed in a predetermined area, it is extremely time-consuming to individually collect data reflecting the operation state and the like. Therefore, if these data output devices are provided in the wireless terminal device to transmit data output from the data output device, data collection can be prepared and efficient even when a large number of data output devices are installed. Can be done

According to the eleventh aspect, a data output device for outputting data to each wireless terminal device is provided, the control unit is connected to the data output device, and the control unit collects data from the data output device. The data is transmitted via the communication unit. In other words, since the control unit collects data output from the data output device and transmits the data via the communication unit, there is no need to provide a data collection interface on the communication unit side, so that the configuration of the communication unit is generalized. can do.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.
First, FIG. 1 schematically shows the entire configuration of the wireless communication system 1. In the wireless communication system 1, each wireless terminal device (A) 2 to wireless terminal device (D) 5 is configured to be able to execute direct communication (transceiver communication) between slave units with another wireless terminal device. Have been.

Also, the wireless terminal device (A) 2 to the wireless terminal device
(D) The wireless terminal device (A) 2 of 5 is a wireless base station (C).
By establishing a public line with the S: Cell Station (S: Cell Station) 8, public communication can be executed. The wireless base station 8 is an ISDN which is a public communication line.
(Integrated Services Digital Network) network 9.

The radio link and ISD between each radio terminal (A) 2 to radio terminal (D) 5 and the radio base station 8
A sub-address field is set in the line of the N network 9, and a unique identification code assigned to the transmitting-side wireless terminal device itself is transmitted using the sub-address field during transmission, as described later. Has become.

On the other hand, a host computer (control unit) 10
Is located in a remote data management center,
The wireless terminal device (H) 12 is configured by being connected to the PHS communication unit 11 serving as a communication unit. Wireless terminal
(H) 12 is configured to be able to execute public communication by establishing a public line with another wireless base station 13 connected to the ISDN 9.

Next, the configuration of each of the wireless terminal devices (A) 2 to (D) 5 will be described with reference to FIG.
Here, each wireless terminal device (A) 2 to wireless terminal device (D)
5 have the same configuration. Each wireless terminal device (A) 2 to wireless terminal device (D) 5 includes a power meter unit (data output device) 1
4, PH having the same configuration as the watt hour meter control unit (control unit) 15 and the PHS communication unit 11 on the data management center side.
An S communication unit 16 is provided.

The power meter unit 14 is disposed, for example, in a general home, and is a meter for integrating the amount of power consumed in the indoor electric wiring of each home. The power meter unit 15 is connected to the watt-hour meter control unit 15 via, for example, a serial interface. Communication is possible. The PHS communication unit 16 includes the antenna 1
7 and has a function substantially equivalent to a radio circuit provided in a well-known PHS telephone device, and controls outgoing and incoming processes based on a command from the watt hour meter control unit 15. It has become. Also, the PHS communication unit 16
A memory (storage means) 16a including a ROM, a RAM and the like is provided therein.

The watt-hour meter control unit 15 serving as a control unit
It is housed in a separate case from the S communication unit 16 and formed separately, connected to the PHS communication unit 16 by wiring,
In addition, the microcomputer is mainly configured. Then, the watt-hour meter control unit 15 collects data output from the power meter unit 14 via the serial interface. PHS communication unit 1
By giving various commands and transfer data to 6, the transmission processing and the reception processing are controlled as described above.

The power meter control unit 15 has a data buffer for temporarily storing data collected by itself and data transferred from another wireless terminal device, and a transmission to itself. Telephone number (call number for line connection) and PS-
A memory (storage means) 15a in which an ID (unique identification code) and the like are stored is provided.

Now, in the wireless communication system 1,
Each wireless terminal device (A) 2 to wireless terminal device (D) 5 has a unique telephone number for communication between slave units (transceiver telephone number). Further, only the wireless terminal device (A) 2 and the wireless terminal device (H) 12 on the management center side also have unique public telephone numbers (call numbers for connection to public lines).

Here, specifically, each wireless terminal device (A)
2 to (D) 5 assume that transceiver telephone numbers "10" to "13" are set as shown in FIG. 3 (transceiver telephone numbers are actually data represented by 13 bits). Also, the telephone number “070-xxxxxx-x” set for the wireless terminal devices (A) 2 and (H) 12
"Xxx" is a public telephone number. In addition, PS-ID (PS
The call code) is 28-bit data used to determine the eligibility of the communication partner in this embodiment, and will be described in detail later. Each of the wireless terminal devices (A) to (D) About 5 and (H) 12, "aaaaaaaa"-
It is assigned like “hhhhhhhh”.

Next, the operation of the first embodiment will be described with reference to FIGS. (1) <Direct communication between slave units (transceiver communication)> FIGS. 4 and 5 show the wireless terminal device (A) 2 to the wireless terminal device.
(D) Direct communication between slave units between 5 units (Transceiver communication)
3 shows the outgoing and incoming sequence (schematic) in the case of performing the following. In FIG. 4, the watt-hour meter control unit 15
First, a transmission command: ATD to the PHS communication unit 16
xxxx, and issues a transmission command (). Then, the PHS communication unit 16 transmits a call message (). Note that “xxxx” is the transceiver telephone number of the receiving side.

For example, assuming that the transmitting side is the wireless terminal device (C) 4 and the receiving side is the wireless terminal device (B) 3, the transceiver telephone number of the wireless terminal device (B) 3 (hereinafter referred to as TR) No.) / Wireless terminal device
(C) The PS-ID of 4 / TR number of the wireless terminal device (C) 4 is designated and notified in the order of (11 / ccccccc / 12).

Here, reference is made to FIG. Wireless terminal
(C) When the PHS communication unit 16 of the wireless terminal device (B) 3 receives the paging message from the wireless terminal device (B) 3, an incoming call notification “RING” is sent to the watt-hour meter control unit 15 (). Terminal device (C) 4 TR number / PS-ID (1
2 / ccccccc).

Then, the watt-hour meter control unit 15 of the receiving-side wireless terminal device (B) 3 checks the notification with the pair of the TR number and the PS-ID stored in the internal memory 15a. If they match any one of the pair of the TR number and PS-ID stored in the memory 15a, it is determined that the source is an appropriate communication partner, and the PHS communication is performed to permit the communication. A communication enable command: ATA is issued to the section 16 ().

Upon receiving the command, the receiving side P
The HS communication unit 16 transmits a response message to the wireless terminal device (C) 4 (). At this time, in the response message, the TR number of the wireless terminal device (C) 4 / the PS-ID of the wireless terminal device (B) 3 / TR number of the wireless terminal device (B) 3 are (12 / bbbbbbbb / 11). It is notified as follows. Also, the PHS communication unit 16 sends a notification “CONNECT” indicating that the communication line has been connected to the watt-hour control unit 15 ().

Referring again to FIG. 4, when the PHS communication unit 16 of the transmitting-side wireless terminal device (C) 4 receives the response message from the receiving-side wireless terminal device (B) 3 (FIG. 4), As in (5) of (5), the connection notification “CONNECT” of the communication line is performed to the watt-hour control unit 15 (), and then the destination TR number / PS-ID (11 / bbbbbb)
bb) is notified (). At this time, if necessary, the eligibility of the destination may be similarly determined.

The procedure up to the establishment of the communication line is completed as described above, and the data of the power meter unit 14 collected by the power meter control unit 15 of the wireless terminal device (C) 4 is stored in the wireless terminal device (B).
The data communication transferred to 3 is performed (10) (note that
Hereinafter, those corresponding to the circled numbers of “10” or more shown in the drawings are represented as “(10)”.)

Next, FIG. 6 shows a selected incoming call sequence in direct communication between child units when an incoming call from many wireless terminal devices occurs for one wireless terminal device. That is,
Assuming that a certain wireless terminal device simultaneously receives paging messages 1, 2, and 3 issued from three different wireless terminal devices, the PHS communication unit 16 sets the incoming call notification “RING”
, Followed by the respective partner TR number and partner P
The S-ID is notified to the watt-hour meter control unit 15, and the watt-hour meter control unit 15 checks each of them.

Then, as a result of the comparison, the watt hour meter control unit 15
And the TR number and PS-
The communication enable command AT is returned so as to return a response to the wireless terminal device that matches one of the pair of IDs (the PS-ID of the matching terminal device is referred to as xxxxxxxxx).
A command that continues A and the PS-IDxxxxxxxxx is issued to the PHS communication unit 16. Next, similarly to FIG. 5, the transmission of the response message and the communication line connection notification “CONNECT” are performed, and the data communication is performed.

(2) <Public Communication> FIGS. 7 and 8 show the outgoing and incoming sequences (summary) for performing public communication between the wireless terminal device (A) and the wireless terminal device (H) 12 in FIG. ). A subaddress field is set between the wireless terminal device (A) 2 and the wireless base station 8 and in the ISDN network 9. There is.

In FIG. 7 showing the public communication transmission sequence, for example, the watt hour meter control unit 15 of the wireless terminal device (A) 2
First, a transmission command: A to the PHS communication unit 16
TDxxxx ... / yy ..., and issues a transmission command (). "Xxxx ..." is a field for setting a called number. In this case, it is a public telephone number (for example, 070-8765-4321) of the wireless terminal device (H) 12. “Yy...” Is a field for setting, for example, a destination subaddress, in which the PS-I of the wireless terminal device (A) 2 is set.
D (aaaaaaaa) is set. Then, the PHS communication unit 16 transmits the call setting to the wireless base station 8 (). In the call setting, the public telephone number (for example, 07) of the wireless terminal device (A) 2 is set in the field for setting the calling number.
0-1234-5678) is also notified at the same time.

Here, reference will be made to FIG. 8 showing a public communication termination sequence. When the call setting () is transmitted from the wireless terminal device (A) 2 in FIG. 1 to the wireless base station 8, the wireless terminal device (H) is transmitted via the ISDN 9 and the wireless base station 13 in FIG.
The PHS communication unit 11 is notified of the incoming call, and upon receiving the call, the PHS communication unit 11 returns an incoming call response to the wireless base station 13. Then, the PHS communication unit 11
Send call setup to (). In this call setup, the wireless terminal device (A) 2 set to the calling number and called sub address
Public telephone number (070-1234-5678) and P
The S-ID (aaaaaaaa) is passed.

When the PHS communication unit 11 returns a response of the call setting reception to the wireless base station 13 (), the call setting reception is performed via the wireless base station 8 by the PH of the wireless terminal device (A) 2.
It is returned to the S communication unit 16 (FIG. 7). Next, in FIG. 8, the PHS communication unit 11 of the wireless terminal device (H) 12
Notifies the host computer 10 of the incoming call (R
ING,), followed by the public telephone number (070-1234-5678) of the partner (source) and the partner PS-ID
(Aaaaaaaa) is notified (). Also, the PHS communication unit 11 returns a call via the wireless base stations 13 and 8 (FIGS. 8 and 7).

The host computer 10 that has received the caller's public telephone number and PS-ID receives the public telephone number and PS-ID pair stored in the internal memory, as in the case of direct communication between child devices. Check any one of the public telephone numbers and PS-Is that are stored in the memory.
If the pair matches the pair of D, it is determined that the transmission source is an appropriate communication partner, and a communication enable command: ATA is issued to the PHS communication unit 11 to permit communication ().

In response to the issuance of the command, the PHS communication unit 11 sets the wireless terminal device through the wireless base stations 13 and 8.
(A) Return a response to 2 (FIGS. 8 and 7). Then, the PHS communication unit 16 of the wireless terminal device (A) 2 notifies the watt-hour meter control unit 15 of the communication line connection notification “CONNECT”.
CT ”(FIG. 7).

In FIG. 8, the radio base station 13
In response to receiving a response from the PHS communication unit 11 of the wireless terminal device (H) 12, a response confirmation is returned to the PHS communication unit 11 (10). Then, the PHS communication unit 11 of the wireless terminal device (H) 12 also performs a communication line connection notification “CONNECT” to the host computer 10 (11).

The procedure up to the establishment of the public communication line is completed as described above, and thereafter, the wireless terminal devices (A) 2, (H) 12
Data communication is performed between (1) in FIG. 8 and FIG.
2)). In the data communication, the data of the power meter unit 14 collected by the watt hour meter control unit 15 of the wireless terminal device (A) 2 up to that point, or the watt hour meter control unit 15 of another wireless terminal device The data collected from the power meter unit 14 and transferred to the wireless terminal device (A) 2 is transmitted to the wireless terminal device (H) 12.
Forwarded to.

The data transferred to the wireless terminal (H) 12 is passed to the host computer 10 and managed collectively. That is, the power management amount of each household is automatically measured, and the data management center performs processing such as calculating an electricity bill according to the usage amount and issuing a bill.

As described above, according to the first embodiment, when an incoming call arrives, if the PS-ID received via the PHS communication unit matches any one of the stored identification codes,
PHS so that line connection with the originating wireless terminal
A response is returned via the communication unit.

That is, by judging whether or not the communication partner is qualified using the PS-ID, the confidentiality can be improved and the access from an unauthorized terminal can be more reliably prevented. System security can be increased. Further, data communication can be performed at high speed by the PHS communication unit.

Since the PS-ID is a code uniquely assigned to all PHS terminals, it is optimal as an identification code for judging the eligibility of a communication partner, and an additional new identification code is added. There is no need to use it, and registration and management can be reduced. In addition, the wireless terminal device on the receiving side can check the eligibility of the communication partner by comparing the PS-IDs at the initial stage of the communication procedure, so that unnecessary line connection can be eliminated.

Further, when eligibility is determined by a telephone number for direct communication between slave units in the direct communication between slave units as in the prior art, the usable bit width is only 13 bits, and the minimum value is 0 and the maximum value is 0. Since the value is 8191, 81
A relatively large-scale system could not be configured by connecting 93 or more wireless terminal devices. On the contrary,
Since 28 bits are assigned to the PS-ID,
A large-scale system can be easily configured. In addition, by providing the watt hour meter control unit 15 independently of the PHS communication unit 16, the control form can be made more flexible, so that the applicable range of the system can be expanded.
Further, the configuration of the PHS communication unit 16 can be generalized as much as possible.

(Second Embodiment) FIG. 9 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. explain. The configuration of the second embodiment is basically the same as that of the first embodiment, but the communication procedure is slightly different. In FIG. 9 showing an incoming sequence in direct communication between slave units, for example, the PHS communication unit 16 of the wireless terminal device (B) 3 in FIG.
(Conditionally, the watt hour meter control unit 15 checks the wireless terminal device (c) 4 as the transmission source and gives an instruction (ATA) for returning a response for line connection). Terminal device (c) 4 TR number / PS-ID (12
/ Ccccccc) is stored in the memory 1 inside the PHS communication unit 16.
6a (FIG. 9).

When there is an incoming call (call message) from the wireless terminal device (c) 4 for a predetermined time from the stored time, the PHS communication unit 16 performs collation in the internal memory 16a. A response message is returned even if there is no response instruction from the watt hour meter control unit 15. Also,
If the predetermined time or more has elapsed, the TR number / P stored in the memory 16a for ensuring security
The S-ID is discarded, and communication is performed again according to a normal procedure.

That is, for a wireless terminal device whose PS-ID is confirmed once and is determined to be qualified as a communication partner, it is expected that incoming calls will continue to occur to some extent thereafter. The need to repeat the same confirmation procedure is low. Therefore, as in the second embodiment, PH
If there is an incoming call from a wireless terminal device having a PS-ID that matches the previously received PS-ID stored in the memory 16a of the S communication unit 16, the PHS communication unit 16
By directly returning a response, security can be ensured and the response time can be shortened.

In the case of direct communication between slave units, there is a case where a call is made while switching channels having different frequencies. For example, a call message is transmitted for 3 seconds using one channel, and there is no response during that time. For example, it is transmitted by switching to a different channel. That is, for example, 3
When the receiving side receives the response message near the end of the second period, if the time is required for the collation by the watt-hour control unit 15, the channel of the transmitting side may be switched at the time of returning the response, and the communication is established. May be difficult to do.

Therefore, as in the second embodiment, the PHS
Since the communication unit 16 directly returns a response, the response time to the call can be shortened, so that the possibility of establishing communication can be further increased.

According to the second embodiment, when the PHS communication unit 16 is controlled by the watt hour meter control unit 15 to establish a line connection with the wireless terminal device on the transmitting side, the PHS communication unit 16 transmits the wireless terminal device on the transmitting side. Is stored in the memory 16a, so that the PHS communication unit 16 retains the identification code of the transmitting-side wireless terminal device even if the connection of the line subsequently fails. Therefore, when there is an incoming call from the wireless terminal device again, the PHS communication unit 16 can determine that the incoming call is a re-incoming call from the wireless terminal device that has received an incoming call in the past at that time, and returns a response in a short time. Connection can be made earlier.

The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications or extensions are possible. In the embodiment described above, when judging the eligibility of the communication partner, the telephone number and the PS-I
Although both matches with D are collated, the determination may be made by collating only the PS-ID. Communication between the wireless terminal device (A) 2 and the wireless terminal device (H) 12 may be performed using the private communication line if a private communication line is provided instead of the public communication line. The PS-ID may be transmitted using the field of the calling sub-address. The identification code unique to each wireless terminal device is not limited to the PS-ID, and a different identification code may be set as long as it is a code unique to each terminal.

Further, the configuration of the wireless communication system is not limited to the above embodiment, and the wireless terminal devices (A) 2 to (D) 5 may directly transfer data to the wireless terminal device (H) 12 by public communication. good. Further, the wireless terminal device (H) 12 is deleted, and the wireless terminal device (A) 2 is connected to the host computer 10 in place of the power meter unit 14 and the watt-hour meter control unit 15, and other wireless terminal devices (H) B) 3 to (D) 5 may transfer data to the wireless terminal device (A) 2 by direct communication between slave units.
Further, the present invention is not limited to these modes, and the wireless terminal devices may mutually perform public communication and direct communication between slave units.
The means for performing data communication using a wireless signal is not limited to the PHS communication unit 16, but may be another wireless communication device. The second embodiment may be applied to a case of public communication via a base station.
Further, in the second embodiment, after the PHS communication unit 16 is controlled by the watt-hour meter control unit 15 to establish a line connection with the wireless terminal device on the transmission side, the PHS communication unit 16 is further identified by the watt-hour meter control unit 15. When a code storage instruction is given, the identification code may be written and stored in the memory 16a. The data output device is not limited to the power meter unit 14, but may be a gas meter, a vending machine, a copy machine, or the like.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating an overall configuration of a wireless communication system according to a first embodiment of the present invention.

FIG. 2 is a functional block diagram showing a detailed electrical configuration of the wireless terminal device.

FIG. 3 is a diagram showing a public telephone number or a transceiver telephone number and a PS-ID assigned to each wireless terminal device.

FIG. 4 is a diagram showing an outline of a transmission sequence in direct communication between slave units.

FIG. 5 is a diagram showing an outline of the incoming call sequence.

FIG. 6 is a diagram showing a selected incoming call sequence when incoming calls from a large number of wireless terminal devices have occurred for one wireless terminal device;

FIG. 7 is a diagram showing an outline of a transmission sequence in public communication.

FIG. 8 is a diagram showing an outline of the incoming call sequence.

FIG. 9 is a view corresponding to FIG. 5, showing a second embodiment of the present invention.

[Explanation of symbols]

1 is a wireless communication system, 2 is a wireless terminal device, 3 to 5 are wireless terminal devices, 9 is an ISDN network, 10 is a host computer, 11 is a center-side PHS communication unit (communication unit), 12 is a wireless terminal device, and 14 is a wireless terminal device. Power meter section (data output device),
Reference numeral 15 denotes a watt hour meter control unit (control unit), 15a denotes a memory (storage unit), 16 denotes a PHS communication unit (communication unit), and 16a denotes a memory (storage unit).

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Ietaka 2-5 Marunouchi, Takamatsu City, Kagawa Prefecture Inside Shikoku Electric Power Company (72) Inventor Koji Ohno 2-5 Marunouchi, Takamatsu City, Kagawa Prefecture Shikoku Electric Power Company Company F term (reference) 5K067 AA30 BB04 DD17 DD51 EE02 EE25 FF02 GG11 HH22 HH23 KK15 5K101 KK12 LL12 MM07 NN21 PP03 QQ07 RR16

Claims (11)

[Claims] 1. A wireless communication system for communicating between a plurality of wireless terminal devices by wireless signals, wherein each wireless terminal device stores a call number for line connection and a unique identification code assigned to itself. And at least an identification code other than its own assigned to the wireless terminal device other than itself is stored, and at the time of calling, the unique identification code assigned to at least the sending side wireless terminal device itself is stored. The receiving-side wireless terminal device transmits, and the unique identification code assigned to the transmitting-side wireless terminal device received at the time of the incoming call matches one of the stored identification codes other than the own wireless terminal device. A wireless communication system for performing line connection with the wireless terminal device on the transmitting side. 2. A wireless communication system for performing communication by a wireless signal between a plurality of wireless terminal devices, wherein each wireless terminal device stores a call number for line connection and a unique identification code assigned to itself. And stores a pair of a calling number other than the self and an identification code other than the self assigned to the wireless terminal other than the self, and at the time of outgoing call, the pair is allocated to the calling wireless terminal itself. Transmitting the call number for the line connection and the unique identification code, the receiving-side wireless terminal device receives the call number and the unique When both of the identification codes of the two correspond to one of the pair of the stored calling number other than the own and the other identification code, the transmitting side wireless terminal apparatus and A wireless communication system for performing line connection. 3. The wireless terminal device includes a communication unit and a control unit, and a storage unit in the control unit stores at least an identification code other than the wireless terminal device assigned to the wireless terminal device other than the wireless terminal device. When a signal from the transmitting-side wireless terminal device is received, the identification code of the transmitting-side wireless terminal device received via the communication unit is different from the identification code of the control unit other than the own wireless terminal device. In the control unit, it is determined whether or not the identification code matches at least one of the identification codes. If the identification code matches, the control unit controls the communication unit to perform a line connection with the transmission side wireless terminal device. The wireless communication system according to claim 1 or 2, wherein: 4. The communication unit and the control unit are housed in separate cases and formed separately, and the control unit is
The wireless communication system according to claim 3, wherein the wireless communication system is connected to the communication unit by wiring. 5. When the control unit controls the communication unit to perform a line connection with the transmission side wireless terminal device, the identification code of the transmission side wireless terminal device is stored in a storage unit in the communication unit. When a signal from the transmitting-side wireless terminal device is received again during a predetermined time from the control, the received identification code of the transmitting-side wireless terminal device is stored in storage means in the communication unit. It is determined in the communication unit whether or not it matches at least one of the identification codes of the transmitting-side wireless terminal devices, and if they match, even if there is no control from the control unit, the communication unit 5. The wireless communication system according to claim 3, wherein a line connection for the re-incoming call is performed with the wireless terminal device on the calling side. 6. The control unit controls the communication unit so as to establish a line connection with the wireless terminal device on the transmission side, and the control unit controls the communication unit at least in a storage unit in the communication unit. 6. The wireless communication system according to claim 5, wherein control is performed to store an identification code of the wireless terminal device on the side. 7. When making and receiving calls between the wireless terminal devices, each of the wireless terminal devices is connected to a wireless line between adjacent wireless base stations and an ISDN network line between the wireless base stations. The sub-address field is set in the radio line between the radio terminal devices and the radio base stations and the line of the ISDN network. The wireless communication system according to any one of claims 1 to 6, wherein the unique identification code assigned to the wireless terminal device itself is transmitted using a field of the subaddress. 8. The method according to claim 1, wherein when making and receiving calls between the wireless terminal devices, communication is performed using direct communication between child devices between the wireless terminal devices.
The wireless communication system according to any one of the above. 9. Each of the wireless terminal devices has a P as a communication unit.
The wireless communication system according to claim 1, further comprising an HS communication unit, wherein a PS-ID assigned to the PHS communication unit is used as the unique identification code. 10. The wireless terminal device includes a data output device that outputs data, and the wireless terminal device transmits data output by the data output device. Items 1 to 9
The wireless communication system according to any one of the above. 11. Each of the wireless terminal devices is provided with a data output device for outputting data, and the control unit is connected to the data output device.
7. The wireless communication device according to claim 3, wherein the control unit collects data output from the data output device and transmits the collected data via the communication unit. Communications system.