JP2005184189A - Remote wireless communication system and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication apparatus to select an optimum frequency. <P>SOLUTION: The remote wireless communication system is composed of a center apparatus 6 and the wireless communication apparatus 5. A center control means 18 acquires the number of other wireless communication apparatuses on the basis of the number of reply telegraphic messages returned in response to a radio wave state inquiry telegraphic message transmitted from the wireless communication apparatus 5 via a center external communication means 16 and a frequency stored in a frequency storage means 8 and an installed identification code stored in an installed location identification code storage means 15, and uses a center frequency revision means 17 to revise the frequency stored in the frequency storage means 8 on the basis of the acquired information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a remote radio communication system that performs data communication using radio waves and a program thereof, and particularly to a remote radio communication system for configuring a home network at home.

  Conventionally, this type of wireless communication system has been described below (for example, see Patent Document 1).

  FIG. 9 shows a conventional wireless communication system described in Patent Document 1. In FIG. As shown in FIG. 9, the wireless communication means 1 for performing wireless communication with other wireless communication devices, the external device connection means 2 for detecting the input of an external signal, and the signal from the external device connection means 2 are received. The control unit 3 changes the frequency used in the wireless communication unit 1 and the external device 4 such as a setting device that communicates with the external device connection unit 2.

The control unit 2 controls the wireless communication unit 1 and performs wireless communication at a fixed frequency. When it is desired to change the fixed frequency, an external device 4 such as a setting device is connected to the external device connection means 2. Then, the frequency information to be changed is transmitted from the external device 4 to the control unit 3 via the external device connection unit 2. Based on the frequency information, the control unit 3 changes the frequency when performing wireless communication using the wireless communication unit 1.
JP 2001-126178 A

  However, in the conventional configuration, the control means changes the frequency only when receiving frequency information from the external device connected to the external device connection means. It is necessary to change the frequency by connecting an external device such as a setting device. In addition, there is a problem that whether or not it is necessary to change the frequency or which frequency to change cannot be accurately determined.

  The present invention solves the above-described conventional problems, and does not require an external device such as a setting device, and does not require an operator to go to the installation site. In addition, even after the installation of the wireless communication device, even if the radio wave environment changes due to the change of the installation environment, the frequency used by other wireless communication systems around the already installed wireless communication system remotely from the center device It is an object of the present invention to provide a remote radio communication system excellent in ease of installation that can be reliably changed to a frequency optimal for radio communication.

  In order to solve the above-described conventional problems, in the remote radio communication system and the program thereof according to the present invention, the center control means returns a radio status inquiry message transmitted by the radio communication apparatus via the center external communication means. The number of other wireless communication devices obtained from the number of response messages, the frequency stored in the frequency storage means and the installation location identification code stored in the installation location identification code storage means are obtained, and the center frequency changing means is used. Based on the acquired information, the frequency stored in the frequency storage means of the wireless communication device is changed.

  The remote radio communication system and its program according to the present invention do not require an external device such as a setting device, and it is not necessary for an operator to go to the installation site. In addition, even if the radio wave environment changes due to a change in the installation environment even after the installation of the wireless communication device, the frequency used by other wireless communication systems around the already installed wireless communication system can be remotely controlled from the center device. It can be confirmed and changed to the optimum frequency for wireless communication. Therefore, it is possible to provide a remote radio communication system that is easy to install and has excellent installability.

  In the first invention, the center control means uses the center external communication means, and the number and installation of other wireless communication devices acquired from the number of response messages returned to the radio wave status inquiry message transmitted by the wireless communication device. By acquiring the installation location identification code stored in the location identification code storage means, the center frequency changing means is used to change the frequency of its own system based on the acquired information, and external devices such as setting devices are installed. It is not necessary, and workers do not have to go to the installation site. In addition, even if the radio wave environment changes due to changes in the installation environment even after installation of the wireless communication device, the frequency used by other wireless communication systems around the installed wireless communication system can be confirmed remotely from the center device. In addition, it is possible to provide a remote radio communication system that can be reliably changed to the optimum frequency for radio communication and has excellent labor and ease of installation.

  In the second invention, in particular, in the first invention, by changing the frequency based on the history of wireless communication, the number of wireless communication devices is small, but even when there is another system with very large communication traffic, Since the frequency can be changed to an optimum frequency, a remote radio communication system with improved communication reliability can be provided.

  According to a third aspect of the invention, in particular, in the second aspect of the invention, the wireless communication history is determined by using the wireless system identification code of the other system received by the control means using the wireless communication means at the same frequency as the own system. Since it is not necessary to send a wireless message to obtain the number of systems, the number of other systems using the same frequency as the local system can be easily obtained without increasing communication traffic, and the optimum frequency can be obtained. A remote radio communication system that can be modified can be provided.

  In the fourth invention, in particular, in any one of the first to third inventions, the installation location identification code includes a customer number assigned to the gas meter or the power meter, and a telephone number of the house where the wireless communication device is installed. By using at least one of the IP addresses, it is not necessary to newly create a correspondence table between the wireless system identification code and the installation location, so that the remote wireless communication system can be provided quickly and inexpensively.

  The fifth invention is a program for causing a computer to execute at least a part of the functions of the remote radio communication system in any one of the first to fourth inventions. Since it is a program, hardware resources such as a CPU (microcomputer), RAM, ROM, storage device, I / O, etc., electrical information equipment, a computer, a server, etc. cooperate with each other in at least the remote radio communication system of the present invention. A part can be easily realized. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a system diagram of a radio communication system according to the first embodiment of the present invention, FIG. 2 is a block diagram of a radio communication apparatus constituting the radio communication system, FIG. 3 is a block diagram of a center apparatus, and FIG. FIG. 4 shows a message format diagram used for wireless communication.

  In FIG. 2, the wireless communication devices 5 </ b> A to 5 </ b> D include a wireless communication unit 1 that performs wireless communication with other wireless communication devices, a frequency storage unit 8 that stores a frequency used for communication using the wireless communication unit 1, and The radio wave condition inquiry means 9 for generating a radio wave condition inquiry message for confirming the frequency used by another wireless communication apparatus, and the center apparatus 6 and the network 7 such as a telephone line, the Internet, a dedicated line, etc. External communication means 10 for performing communication, wireless system identification code storage means 11 for storing a wireless system identification code assigned uniquely for each wireless communication system, and a wireless communication system having the same wireless system identification code Device identification code storage means 1 for storing a device identification code uniquely assigned to identify each wireless communication device within the device A temporary device identification code storage unit 13 that stores a temporary device identification code that is not unique but is randomly set in advance, and an operation mode storage unit 14 that stores an operation mode for operating as a master or a slave. , An installation location identification code storage means 15 storing an installation location identification code for specifying the installation location of the wireless communication apparatus, and a control means 3 for controlling each means.

  In FIG. 3, a center device 6 includes a center external communication unit 16 that communicates with the wireless communication devices 5A and 5B via a network, a center frequency change determination unit 17 that determines a change in frequency used in the wireless communication system, And center control means 18 for controlling each means.

  The operation and action of the remote radio communication system constituted by the center device 6 and the radio communication devices 5A to 5D configured as described above will be described below.

  As shown in FIG. 1, the wireless communication system includes a wireless communication device called a master and a wireless communication device called a slave, and 01 is set as a device identification code as a fixed value in the masters 5A and 5C. In addition, a unique wireless system identification code is set in advance in the wireless system identification code storage means 11 in the masters 5A and 5C at the time of manufacture. The slaves 5B and 5D, from the master at the time of registration, a wireless system identification code that the master has, a device identification code that is unique for each slave, and a frequency that is used in normal communication from a plurality of predetermined usable frequencies Assigned. And they communicate with each other using these.

  Here, a method in which the own system (5A, 5B) installed in the communication area of the other system (5C, 5D) changes the frequency will be described. The own system has a wireless communication device 5A (device identification code: 01) as a master, a wireless communication device 5B (device identification code: 02) as a slave, a wireless system identification code: 002, and a use frequency: A. The other system has a wireless communication device 5C (device identification code: 01) as a master, a wireless communication device 5D (device identification code: 02) as a slave, a wireless system identification code: 002, and a use frequency: A.

  In FIG. 1, the operation mode storage means 14 in the wireless communication device 5A is set in advance to operate as a master. On the other hand, the operation mode storage unit 14 in the wireless communication device 5B is set in advance to operate as a slave. In the wireless communication device 5A, the center control means 18 in the center device 6 uses the center external communication means 16 at a predetermined time (or a fixed time interval) via the network network. A message to shift to the frequency change mode is transmitted to the control means 3 in 5A. When the control means 3 receives the telegram from the center device 6 using the external communication means 10, the control means 3 shifts to the frequency change mode (S1 in FIG. 4) and operates as a master from the operation mode stored in the operation mode storage means 14. Determine what to do.

  Next, the control means 3 in the master wireless communication apparatus 5A uses the radio wave condition inquiry means 9 to confirm the number of other wireless communication apparatuses using the same frequency as the frequency used in its own system. The radio communication status message is generated using the wireless communication means 1, the wireless system identification code is all 1, the transmission destination device identification code is FF for broadcast designation, and the transmission source device identification code is the wireless communication device 5A. Is obtained, and the frequency A stored in the frequency storage means 8 is acquired, and a radio wave status inquiry message is transmitted by broadcast at this frequency A (S2). For example, a message format shown in FIG. 5 may be used as the message format of the radio wave status inquiry message, and a flag may be set in the control code 2 (20 in FIG. 5) to indicate the radio wave status inquiry message.

  The radio wave status inquiry message transmitted in the broadcast is received by the wireless communication device 5C and the wireless communication device 5D using the wireless communication device 1 under the control of the control device 3 (the wireless communication device 5C and the wireless communication device 5D). Because communication is performed using frequency A between the two). The control unit 3 in the wireless communication device 5C and the wireless communication device 5D uses the wireless communication unit 1 to set the wireless system identification code to all 1 and the transmission destination device identification code to the transmission source device identification code in the radio wave status inquiry message. The set 01, the transmission source device identification code is set to 01 which is the device identification code of the wireless communication device 5C and 02 which is the device identification code of the wireless communication device 5D, and the response message 1 is returned (S3).

  The control means 3 in the wireless communication device 5A uses the wireless communication means 1 to receive the response message 1 returned from the wireless communication device 5C and the wireless communication device 5D. Then, using the external communication means 10 via the network 7, the number of response telegrams 1, that is, the number of wireless communication devices of other systems (here, 2), used in normal communication stored in the frequency storage means 8 Frequency setting information (here, frequency: A), and the installation location identification code for specifying the installation location of the wireless communication device stored in the installation location identification code storage means 15 via the network 7 Transmit to the center device 6. The center control means 18 in the center device 6 stores the number of response messages 1 in the center frequency determination means 17 (for example, 1 is stored in advance as a threshold value) and is stored using the center frequency determination means 17. When the threshold value <the number of response messages is established, the frequency used in the own system (between the wireless communication device 5A and the wireless communication device 5B) is determined based on the frequency information and the installation location identification code. The change from the frequency A to the frequency B is determined, and a telegram for instructing the change to the frequency B is transmitted to the wireless communication device 5A using the center external communication means 6. The control means 3 in the wireless communication device 5A stores the frequency B in the frequency storage means 8 when receiving this message. That is, the center device 6 has a database of installation locations of the wireless communication system, and other systems installed in the vicinity of the wireless communication device 5A are determined from the installation location identification code of the wireless communication device 5A (here Then, the wireless communication device 5C and the wireless communication device 5D are changed to a frequency B different from the frequency of the other system.

  Then, the control means 3 in the wireless communication device 5A uses the wireless communication means 1, the wireless system identification code is 001, the transmission destination device identification code is 02, which is the device identification code of the wireless communication device 5B, the transmission source device identification code Is transmitted to the wireless communication device 5B (S4). For example, as the frequency information, the frequency B stored in the frequency storage means 6 is set in the transmission data portion 21 of the message format in FIG.

  The control means 3 in the wireless communication device 5B receives the frequency change message, and stores the frequency B, which is frequency information included in the transmission data part of the frequency change message, in the frequency storage means 8. Then, using the wireless communication means 1, the wireless system identification code is 001, the transmission destination device identification code is 01 which is the device identification code of the wireless communication device 5A, and the transmission source device identification code is the device identification code of the wireless communication device 5B. The response message 2 set to 02 is transmitted to the wireless communication device 5A (S5). Then, the frequency change mode is canceled in the wireless communication device 5A (S6), and the mode shifts to the normal mode in which normal communication is performed. Thereafter, communication is performed between the wireless communication device 5A and the wireless communication device 5B using the frequency B stored in the frequency storage unit 8 under the control of the control unit 3.

  In the present embodiment, the wireless communication device 5A transmits a radio wave status inquiry message after receiving a message instructing a radio wave status inquiry message from the center device 6, and transmits the number of response messages 1 to the center device 6. However, the wireless communication device 5A transmits a radio wave status inquiry message at a predetermined time (or a fixed time interval), stores the number of response messages 1, and receives a radio wave status inquiry message from the center device 6. When receiving a message instructing, the number of response messages 1 stored in the memory can be returned.

  In the present embodiment, it has been described that the response message 1 is not returned from the wireless communication device 5B that is the own system in response to the transmission of the radio wave status inquiry message. This can be realized in advance by setting so that the wireless communication device 5A communicates with the wireless communication device 5B using individual communication or broadcast communication, and does not return a response to the radio wave status inquiry message. Alternatively, when the response message 1 is returned from the wireless communication device 5B that is the own system, the wireless communication device 5A knows the number of slave wireless communication devices in the own system (in this case, 1 ), By subtracting the number of slaves in the own system from the number of response messages 1, it is possible to determine the wireless communication devices of other systems (3-1 = 2 in this example).

  As the time interval at which the center control means 18 transmits the radio wave status inquiry message, a method using an internal timer such as a microcomputer or a method using a real-time clock IC or the like can be considered. The time interval may not be a fixed time interval. For example, a method of outputting at a time of low communication frequency such as midnight, a method of outputting at random, a method of outputting every 25 hours in order not to send a radio wave status inquiry message at the same time, etc. Can be considered.

  As described above, in the present embodiment, the number of other wireless communication devices using the same frequency as that of the own system is acquired based on the number of response messages 1 returned to the radio wave status inquiry message. The center frequency determining means 17 is used to determine the change of the frequency used in the own system based on the number of the acquired wireless communication devices, so that an external device such as a setting device is not required and an operator installs it. There is no need to visit the site. In addition, even after the installation of the wireless communication device, even if the radio wave environment changes due to the change of the installation environment, the frequency used by other wireless communication systems around the installed wireless communication system can be remotely controlled from the center device. It can be confirmed and surely changed to the optimum frequency for wireless communication. Therefore, it is possible to provide a remote radio communication system that is easy to install and has excellent installability.

  Further, in place of the radio wave status inquiry means 9 described above, a communication history storage means 19 for storing a history of wireless communication under the control of the control means 3 is provided. For example, the control means 3 in the wireless communication device 5A includes the wireless communication device 5B and When performing wireless communication, the wireless communication history such as the number of carrier busy times, the number of communication failures, the number of retransmissions, and the error rate of wireless data is stored in the communication history storage means 19. Then, the center control means 18 monitors the communication history storage means 19 and transmits a radio wave status inquiry message in the same manner as the radio wave status inquiry means 9 described above when a predetermined threshold value is exceeded. It can also be done.

  As described above, by providing the communication history storage unit 19, the number of wireless communication devices of other systems is small, but even when communication traffic is very large, the wireless communication history stored in the communication history storage unit 19 is used together. Therefore, the frequency can be changed to a more optimal frequency. Therefore, it is possible to provide a wireless communication system with improved communication reliability. In particular, the communication history storage means 19 stores the wireless system identification code of the other system received using the wireless communication means 1 at the same frequency as the own system stored in the frequency storage means 8 by the control means 3. When the wireless system identification code included in the message at the time of reception is not the same as the wireless system identification code of the own system, the wireless communication device 5A only needs to store the different wireless system identification code, and the number of other systems Since it is not necessary to transmit a wireless telegram for acquisition, the number of other systems using the same frequency as that of the own system can be easily acquired without increasing communication traffic, and the optimum frequency can be obtained from the center device 6. A remote radio communication system that can be modified can be provided.

  The installation location identification code stored in the installation location identification code storage means 15 may be the customer number of the gas meter, water meter or power meter connected to the wireless communication device, and is obtained in advance by the control of the control means 3. It is stored in the installation location identification code storage means 15. You may memorize | store these in the installation place identification code memory | storage means 15 of either a master or a slave, or both. Further, the telephone number of the wireless communication apparatus or an IP address may be used.

  As described above, by using at least one of the customer number assigned to the gas meter or power meter, the telephone number of the house where the wireless communication device is installed, and the IP address as the installation location identification code, a new wireless Since it is not necessary to create a correspondence table between system identification codes and installation locations, a remote radio communication system can be provided quickly and inexpensively.

  In the present embodiment, the source device identification code included in the radio wave status inquiry message has been described as the device identification code of the wireless communication device 5A, but is stored in the temporary device identification code storage unit 13 in the wireless communication device 5A. A method using a temporary device identification code that is a random value is also conceivable.

  As described above, by using the temporary device identification code as the transmission source device identification code included in the radio wave status inquiry message, the transmission destination device identification code included in the response message 1 for the radio wave status inquiry message is not fixed to 01. Since the value is a random value, a plurality of wireless communication devices are installed at the same time, so that it is less likely that the response message 1 to the radio wave status inquiry message transmitted by another wireless communication device is erroneously received, and communication reliability is improved. Will improve.

  In the previous embodiment, the wireless communication device 5A determines that the frequency of the response message 1 or the value stored in the communication history storage unit 19 exceeds the predetermined threshold with respect to the center device 6. It is also possible to send a message requesting a change in the message.

(Embodiment 2)
FIG. 6 is a block diagram of the second exemplary embodiment of the present invention. The same reference numerals as those in Embodiment 1 have the same functions. The difference from the first embodiment is that random number generation means 20 for generating random numbers is provided.

  The operation and action of the wireless communication system configured as described above will be described below.

  In the previous embodiment, the radio wave status inquiry message transmitted by the broadcast is received by the wireless communication device 1 under the control of the control device 3 in the wireless communication device 5C and the wireless communication device 5D. For the radio wave status inquiry message, all wireless system identification codes are set to 01, the transmission destination device identification code is set to 01 as the transmission source device identification code in the radio wave status inquiry message, and the transmission source device identification code is set to the wireless communication device 5C. The response message 1 set to 01, which is the device identification code, and 02, which is the device identification code of the wireless communication device 5D, has been described as being returned (S3). However, in this embodiment, the control means 3 After receiving the radio wave status inquiry message, the random number generation means 20 is used to generate a random number, and the response message 1 is returned after the time obtained from the generated random number has elapsed.

  As described above, since the response message 1 returned after receiving the radio wave status inquiry message is returned in a random time based on the random number generated by the random number generation means 20, the response messages 1 transmitted from 5C and 5D Since the probability of collision will be reduced and the communication success rate will be improved, the number of other wireless communication devices can be obtained more accurately.

  In the previous embodiment, the control means 3 in the wireless communication device 5A receives the response message 1 that is returned in response to the transmission of the radio wave status inquiry message, and the number of response messages 1 (here 2) is the frequency. Store in the determination means 8. For example, 1 is stored in advance as a threshold value in the frequency determination means 8. When the threshold value <the number of response messages is established by comparing with this threshold value, the own system (the wireless communication device 5A and the wireless communication device) It has been described that the frequency used between the devices 5B) is changed from the frequency A to the frequency B and the frequency B is stored in the frequency storage means 8, but in the present embodiment, the control means 3 is used when changing the frequency. Then, a random number is generated using the random number generation means 20, a frequency to be used is determined based on the generated random value, and the frequency is stored in the frequency storage means 8. For example, if the frequency that can be used between the wireless communication device 5A and the wireless communication device 5B is A to F, the frequency B to F is selected at random.

  As described above, since the frequency to be used in its own system is selected at random, even if multiple wireless communication systems change the frequency at the same time, the frequency is not changed to the same frequency. Since the probability of collisions is reduced and the communication success rate is improved, the reliability of wireless communication is improved.

  Further, in the random number generation means 20 in the present embodiment, as a method for generating a random number, a method using an average sampling method or a congruent method can be considered. As initial values used at this time, current time information, start-up time from power-off of the wireless communication device, timer value of the internal timer of the wireless communication device, wireless system identification code of the wireless communication device, device identification code of the wireless communication device It is conceivable to use the serial number of the wireless communication device or the temporary device identification code of the wireless communication device (because the wireless communication device as a slave also operates as a master when set as the master in the operation mode storage means 14, It is assumed that a unique wireless system identification code is stored in advance).

  As described above, since the initial value used by the random number generation unit 20 is different for each wireless communication device, the values generated by the random number generation unit 20 are less likely to be the same, and the response messages 1 collide with each other. The probability is reduced, and the number of other wireless communication devices can be acquired more accurately.

  In the present embodiment, the random number generation unit 20 has been described as generating a random number using an average sampling method or a congruent algorithm. However, as a simple method that is not a random number, The response message 1 is obtained by performing an operation using the timer value of the timer, the wireless system identification code of the wireless communication device, the device identification code of the wireless communication device, the serial number of the wireless communication device, or the temporary device identification code of the wireless communication device. A method of selecting a reply time and a frequency to be used is also conceivable. For example, when the temporary device identification code is set in the range of 80 to FF in hexadecimal, the time for returning the response message 1 is calculated from the arithmetic expression of (last 1 digit × α) msec (α is the response message) 1), or when the frequency to be used is determined as A to F in advance, if the last digit is 0 or more and 5 or less, A (16 Hex) is added and converted from A to F. If the last digit is 6 or more and 9 or less, 4 (hexadecimal) is added and converted from A to D, and if the last 1 digit is A or more and F or less A method of determining a frequency to be used by adding 0 can be considered.

  In the first embodiment and the second embodiment, the response message 1 for the radio wave status inquiry message is returned by both the wireless communication device 5C (master) and the wireless communication device 5D (slave). Although it has been described that the number of units is acquired and the frequency to be used is determined based on the number of units, the wireless system identification code of the wireless communication device 5C as a master is set to the wireless system identification code of the wireless communication device 5D as a slave. A method in which only the master (wireless communication device 5C) returns the response message 1 is also conceivable.

  As described above, for example, when a plurality of wireless communication systems are performing communication using the same frequency (frequency A) as that of the own system, one wireless communication system provides a single response. The probability that the response messages 1 collide with each other can be reduced, and the communication success rate is improved, so that the reliability is improved. In addition, since the time required to acquire the radio wave status is shortened, the radio wave status can be acquired efficiently.

(Embodiment 3)
FIG. 7 is a block diagram of the third embodiment of the present invention. The same reference numerals as those in Embodiments 1 and 2 have the same functions. The difference from the first embodiment and the second embodiment is that a slave number storage unit 21 for storing the number of wireless communication devices called slaves in the system is provided in a wireless communication device called a master.

  The operation and action of the wireless communication system configured as described above will be described below.

  In the previous embodiment, the response message 1 for the radio wave status inquiry message has been described as being returned by the wireless communication device 5C (master). However, in this embodiment, at this time, in the wireless communication device 5C called the master The control means 3 acquires the number of slaves registered in its own device from the slave number storage means 21 that stores the number of slaves, and includes the acquired information on the number of slaves in the response message 1 in the wireless communication device 5A. Reply to. As a method of storing the number of slaves in the slave number storage means 21, for example, a method of counting and storing the number when registering a wireless communication device called a slave in the registration mode is conceivable.

  As described above, the response message 1 returned to the radio wave status inquiry message includes the number of slaves, so that even if all the wireless communication devices do not return the response message 1, other wireless communication devices Therefore, the probability that the response messages 1 collide with each other is reduced, and the communication success rate is improved. Therefore, the number of other wireless communication devices can be more accurately acquired. In addition, since the time required to acquire the radio wave status is shortened, the radio wave status can be acquired efficiently.

  In the previous embodiment, it is conceivable to set a wireless system identification code (for example, all 1) that can be received by all wireless communication devices as the wireless system identification code included in the radio wave status inquiry message.

  As described above, since all wireless communication devices can receive radio wave status inquiry messages, even when there are multiple wireless communication systems, it is not necessary to store wireless system identification codes corresponding to each wireless communication system, The installation capacity is excellent and the memory capacity for storing the wireless system identification code can also be reduced.

  In the previous embodiment, as shown in the communication layer configuration diagram of FIG. 8, the control means 3 includes a lower-layer communication software 31 that performs communication protocol processing specific to each transmission medium, and an application that uses the transmission medium. The software 32 is provided at a position sandwiched between the lower-layer communication software 31 and the application software 32. Even if different transmission media are used, the application software 32 does not need to be aware of the different transmission media. It is comprised from the communication middleware 33 which works to show.

  When transmitting the radio wave status inquiry message generated by the radio wave status inquiry unit 9, the control unit 3 sets a flag indicating that it is a message to be processed by the lower-layer communication software 31 (for example, the control code 2 ( 20) in FIG. 5), the radio communication means 1 is used to transmit a radio wave status inquiry message by broadcast (s2 in FIG. 4). Then, the radio wave status inquiry message is received by the radio communication device 5C and the radio communication device 5D using the radio communication unit 1 under the control of the control unit 3, and the part of the control code 2 in the radio wave status inquiry message is confirmed. .

  At this time, if a flag indicating that the message is processed by the lower communication software 31 is set, the communication middleware 33 and the application software 32, which are higher than the lower communication software 31, have received the radio wave status inquiry message. Response message 1 is returned without notification. If the flag indicating that the message is to be processed by the lower communication software 31 is not set, the communication middleware 33 and the application software 32 that are higher than the lower communication software 31 indicate that the radio wave status inquiry message has been received. The response message 1 is returned in response to an instruction from the communication middleware 33 or the application software 32 in the upper layer.

  As described above, on the receiving side, the radio wave status inquiry message is processed by the lower-layer communication software 31 regardless of the application software 32 and the communication middleware 33. Therefore, even if there are a plurality of transmission media as shown in FIG. Since there is no need to change the software 32 or the communication middleware 33, the versatility is excellent and the software development efficiency is improved.

  In the previous embodiment, a program for causing a computer to function as at least a part of the means of the wireless communication system is a program, so that it is a CPU (microcomputer), RAM, ROM, storage device, I / O. A part or all of the wireless communication apparatus of the present invention can be easily realized by cooperating hardware resources such as an electric information device, a computer, a server, and the like. In the form of a program, new functions can be easily distributed / updated and installed by recording them on a recording medium such as magnetic media or optical media or distributing them via a communication line such as the Internet.

  In the previous embodiment, as the temporary device identification code, a method using the last two digits of the serial number of the wireless communication device can be considered.

  In the previous embodiment, it has been described that FF, which is a device identification code for performing broadcast communication, is set as the transmission destination device identification code set in the radio wave status inquiry message. In the case of 1, transmission is performed by a method in which all wireless communication devices receive a message, or by providing a flag for distinguishing between a broadcast message and an individual communication message in the control code 1 in the message format in FIG. The destination device identification code may be not limited to FF.

  In the previous embodiment, the threshold value set in advance in the frequency determining means 8 has been described as 1. However, for example, when the frequency used in one wireless communication system is 3 channels, 3 wireless communication Since it is possible to communicate with the system at the same time, it may be set to 2.

  In the previous embodiment, the frequency used between the wireless communication device 5A and the wireless communication device 5B has been described as being changed from the frequency A to the frequency B. However, in the changed frequency B, the radio wave status inquiry is performed in the same manner as described above. A method of changing the frequency again by transmitting a message is also conceivable.

  Note that when the frequency used between the wireless communication device 5A and the wireless communication device 5B is, for example, frequencies A to F, and the threshold value <the number of response messages at all frequencies, the response is within the frequencies A to F. A method is also conceivable in which a frequency with the smallest number of electronic messages 1 is selected and used for communication between the wireless communication device 5A and the wireless communication device 5B.

  In the previous embodiment, the wireless communication device 5A is a master (having a function for assigning a wireless system identification code and a device identification code), and the wireless communication device 5B is a slave (a function for assigning a wireless system identification code and a device identification code). As described above, the wireless communication device 5A also notifies the wireless communication device 5B of the frequency information to be used. However, even when both the wireless communication device 5A and the wireless communication device 5B are operated as slaves, the same applies. it can. In addition, a transmission request message of a radio wave status inquiry message is transmitted from the center device 6 to the wireless communication device 5 </ b> A, and the frequency to be used is stored in the frequency storage unit 8. Then, by connecting an external device (such as a personal computer), the frequency information stored in the previous frequency storage means 8 is acquired, and then the external device (such as a personal computer) is connected to the wireless communication device 5B and used. The method of setting up is also conceivable.

  In the previous embodiment, the control means 3 uses the frequency determination means 8 to determine the change of the frequency used in the own system, and notifies the changed frequency to the wireless communication device in the own system. It has been explained that the frequency used in its own system is changed by sending a frequency change message to be transmitted, but instead of changing the frequency, to prevent the same bit from being repeated in the wireless message data, or for encryption It is also possible to change the scramble code used for the scramble conversion performed in the same way (for example, the scramble code stored in the scramble code storage means in the transmission data portion 21 of the message format in FIG. 4 instead of the frequency change message). The scramble code is changed by transmitting a scramble code change message in which the code is set).

  In the previous embodiment, the wireless communication device 5A includes device number storage means for storing the number of devices of other systems for each of a plurality of usable frequencies, and the control means 3 receives signals from the center device 6. The frequency is sequentially switched each time a radio wave is received, a radio wave status inquiry message is transmitted from the wireless communication means 1 to another wireless communication device, and the number of devices for each frequency is obtained from the number of response messages 1 for the radio wave status inquiry message. A method of storing the number of devices for each frequency in the device number storage means and determining the change of the frequency used in the own system using the frequency determination means 8 based on the number of devices stored in the device number storage means is also conceivable. .

  In the previous embodiment, the case where the own system is a 1: 1 wireless system including the wireless communication device 5A as a master and the wireless communication device 5B as a slave has been described. The same can be applied to the case of a 1: N system composed of devices. For example, when the wireless communication device 5A transmits a frequency change message to a plurality of slave wireless communication devices, a method of individually transmitting each device or a simultaneous transmission using a broadcast message and a response A method of individually transmitting to a wireless communication device to which the electronic message 2 is not returned is conceivable.

  As described above, the remote wireless communication system and the program thereof according to the present invention enable the wireless communication device itself to autonomously change to a frequency optimal for wireless communication. In addition to communication of device groups, flow rate measuring device groups, health device groups, etc., it can also be applied to uses such as outdoor wireless data communication such as telemeters and telecontrols.

System diagram of radio communication system in Embodiment 1 of the present invention 1 is a block diagram of a wireless communication system according to Embodiment 1 of the present invention. The block diagram of the center apparatus in Embodiment 1 of this invention Communication sequence diagram of wireless communication system according to Embodiment 1 of the present invention Message format diagram of wireless communication system according to Embodiment 1 of the present invention Block diagram of a radio communication system in Embodiment 2 of the present invention Block diagram of radio communication system according to Embodiment 3 of the present invention Communication layer diagram of radio communication system according to Embodiment 3 of the present invention Block diagram of a conventional wireless communication system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wireless communication means 2 External apparatus connection means 3 Control means 4 External equipment 5 Wireless communication apparatus 6 Center apparatus 8 Frequency storage means 9 Radio wave condition inquiry means 10 External communication means 15 Installation location identification code storage means 16 Center external communication means 17 Center frequency Determination means 18 Center control means 19 Communication history storage means

Claims (5)

In a remote radio communication system composed of a radio communication device that communicates using a radio telegram and a center device, the radio communication device uses radio communication means that performs radio communication and the same frequency as that of its own system. An installation location identification code that stores a radio wave status inquiry means for generating a radio wave status inquiry message for confirming the number of other wireless communication devices that are installed, and an installation location identification code for specifying the installation location of the wireless communication device A storage unit; an external communication unit for communicating with the center device; and a control unit for controlling the units. The center device communicates with the wireless communication device. A center frequency determining means for determining a change in the frequency used in the wireless communication device; and a center control means for controlling the respective means. The center control means includes, via the center external communication means, the number of other wireless communication devices acquired from the number of response messages returned to the radio wave status inquiry message transmitted by the wireless communication device and the installation location identification code. A remote radio communication system which acquires an installation location identification code stored in a storage means and changes the frequency of the own system based on the acquired information using the center frequency changing means. The remote control communication system according to claim 1, wherein the center control means changes the frequency using the center frequency changing means based on a history of wireless communication. The remote wireless communication system according to claim 2, wherein the wireless communication history is a wireless system identification code of another system received by the control means using the wireless communication means. The installation location identification code uses at least one of a customer number assigned to a gas meter, a water meter or a power meter, a telephone number of a house where a wireless communication device is installed, and an IP address. The remote radio communication system according to any one of the above. The program for making a computer perform at least one part of the function of the remote radio | wireless communications system of any one of Claims 1-4.

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