JP2005117309A - Wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system in which an external device such as a setter is unnecessary and a wireless communication device itself autonomously changes a frequency into the frequency suitable to wireless communication. <P>SOLUTION: The wireless communication system is equipped with a wireless communication means 1, a frequency storage means 6, a radio wave inquiring means 7, a frequency determining means 8, and a control means 3, which generates a radio wave state inquiry message by a radio wave state inquiring means 7 and transmits it by using the wireless communication means 1. Then the frequency determining means 8 is used to determine a frequency to be used for communication according to the number of answer messages to the radio wave state inquiry message, and the determined frequency is stored in the frequency storage means 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless communication system that performs data communication using radio waves, and more particularly to a wireless 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. 8 shows a conventional wireless communication system described in Patent Document 1. In FIG. As shown in FIG. 8, 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 unit changes the frequency only when frequency information is received from the external device connected to the external device connection unit. Therefore, in order to change the frequency, an external device such as a setting device is used. Is required. In addition, there is a problem that whether or not it is necessary to change the frequency, or which frequency to change cannot be determined for optimization.

  The present invention solves the above-described conventional problems, and provides a wireless communication system that does not require an external device such as a setting device and that the wireless communication device itself autonomously changes to a frequency optimal for wireless communication. With the goal.

  In order to solve the conventional problem, in the wireless communication system of the present invention, the control unit generates a radio wave state inquiry message using the radio wave state inquiry unit, and transmits the radio wave state inquiry message to another wireless communication device. Thus, it is assumed that transmission is performed using wireless communication means.

  Thereby, the number of other wireless communication devices using the same frequency as the own system is determined by the number of response messages returned to the radio wave status inquiry message, and based on the number of the other wireless communication devices, The frequency used in the own system is determined using the frequency determining means.

  The wireless communication system of the present invention does not require an external device such as a setting device or a handy controller, and whether or not it is necessary to change the frequency, or to determine which frequency to optimize, There is no need for workers to operate external devices, and the wireless communication device itself autonomously changes to the optimal frequency for wireless communication. It is possible to provide a wireless communication system that is excellent in installability.

  In the first invention, the control means transmits the radio wave status inquiry message to another wireless communication device by using the radio communication means, and based on the number of response messages returned to the radio wave status inquiry message. The frequency to be used in the system will be determined using the frequency determination means, and no external device such as a setting device or handy controller is required, and whether or not the frequency needs to be changed, or to which frequency It is not necessary for the operator who operates the external device to make decisions such as optimization, and the wireless communication device itself autonomously changes to the optimal frequency for wireless communication, so there is no human error. It is possible to provide a radio communication system that can be changed to an optimal frequency and has excellent installation properties that do not require much effort.

  In the second invention, in particular, in the first invention, by using a temporary device identification code that is a random value in advance as a transmission source device identification code included in the radio wave status inquiry message, a response message to the radio wave status inquiry message is used. Because the destination device identification code included is a random value, multiple wireless communication devices can be installed at the same time, so that a response message to a radio wave status inquiry message transmitted by another wireless communication device may be received in error. This reduces communication reliability.

  In particular, the third invention is characterized in that, in any one of the first and second inventions, a random number generating means for generating a random number by the control of the control means is provided, and a time from when a radio wave status inquiry message is received until a response message is returned. Is based on the random number generated by the random number generation means, so that the response message will be less likely to collide and the communication success rate will be improved. The number of communication devices can be acquired.

  In a fourth aspect of the present invention, in particular, in any one of the first to third aspects of the present invention, the random number generation means for generating a random number by the control of the control means is provided, and the frequency for transmitting the radio wave status inquiry message is determined by the random number generation means. By using a randomly selected frequency from a plurality of predetermined frequencies based on the generated random number, even when a plurality of wireless communication systems change the frequency, it is less likely to be changed to the same frequency. Since the probability of collision between wireless telegrams is reduced and the communication success rate is improved, the reliability of wireless communication is improved.

  In the fifth invention, in particular, in any one of the third or fourth invention, the initial value used for the random number generation means is at least one of a wireless system identification code, a device identification code, a serial number, and a temporary device identification code. By using it, the value generated by the random number generation means of each wireless communication device is less likely to be the same, so the probability that the response telegrams collide is reduced, and the number of other wireless communication devices is acquired more accurately. be able to.

  In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, only the master returns a response message to the radio wave status inquiry message. When the number of systems is used, the control means determines the frequency to be used in the own system. When a plurality of wireless communication systems are communicating using the same frequency as the own system, one wireless communication system cannot Therefore, the communication traffic can be reduced, the probability that the response messages collide with each other, and the communication success rate is improved, so that the reliability of wireless communication is improved. In addition, since the time required to acquire the radio wave status is shortened, the radio wave status can be acquired efficiently.

  In the seventh invention, in particular, in the sixth invention, by including the number information of slaves stored in the slave number storage means in the response message returned to the radio wave status inquiry message, all wireless communication Since the number of other wireless communication devices can be acquired even if the device does not return a response message, the probability that the response messages will collide with each other is reduced, and the communication success rate is improved. The number can be acquired. In addition, since the time required to acquire the radio wave status is shortened, the radio wave status can be acquired efficiently.

  In an eighth aspect of the invention, in particular, in any one of the first to seventh aspects of the invention, a wireless system identification code that can be received by all wireless communication devices is set in the wireless system identification code included in the radio wave status inquiry message. Thus, even when there are a plurality of wireless communication systems, there is no need to store wireless system identification codes corresponding to each wireless communication system, so that the installation is excellent and the memory for storing the wireless system identification codes Capacity can also be reduced.

  In a ninth aspect of the invention, in particular, in any one of the first to eighth aspects of the invention, a flag indicating that the message is a message processed by the lower-layer communication software is set in the radio wave status inquiry message, and the radio wave status inquiry means is used. By transmitting the radio wave status inquiry message, the reception side can process the radio wave status inquiry message with lower-layer communication software regardless of application software or communication middleware, so even if there are multiple transmission media, Since there is no need to change the communication middleware, the versatility is excellent and the software development efficiency is improved.

  The tenth invention is a program for causing a computer to realize at least a part of the means of the wireless communication device in any one of the first to ninth inventions. And since it is a program, a part or all of the radio | wireless communication apparatus of this invention can be easily implement | achieved using a microcomputer etc. 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 wireless communication system according to a first embodiment of the present invention, FIG. 2 is a block diagram of a wireless communication apparatus constituting the wireless communication system, and FIG. 3 is a diagram for determining a frequency used for communication. FIG. 4 is a communication sequence diagram, and FIG. 4 shows a message format diagram used in 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 6 that stores a frequency used for communication using the wireless communication unit 1, and Radio wave status inquiry means 7 for generating a radio wave status inquiry message for confirming the frequency used by another wireless communication device, frequency determination means 8 for determining the frequency to be used in the own system, and other operation by external operation An external input means 9 for shifting to a registration mode for associating with a wireless communication apparatus; a wireless system identification code storage means 10 for storing a wireless system identification code assigned uniquely for each wireless communication system; A device identification code uniquely assigned to identify each wireless communication device in a wireless communication system having the same wireless system identification code The device identification code storage means 11 for storing the temporary device identification code storage means 12 for storing the temporary device identification code that is not unique but set at random, and the operation mode for operating as a master or a slave. Is provided with an operation mode storage means 13 and a control means 3 for controlling each means.

  The operation and action of the wireless communication system 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 master. In addition, a unique wireless system identification code is set in advance in the wireless system identification code storage means 10 at the time of manufacture in the master. At the time of registration, the slave is assigned by the master a radio 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 frequencies that can be used. . And they communicate with each other using these.

  Here, another wireless communication system (wireless system identification) composed of a wireless communication device 5C (device identification code: 01) that is already installed and a wireless communication device 5D (device identification code: 02) that is a slave. A method of determining the frequency to be used between the wireless communication device 5A and the wireless communication device 5B by installing the wireless communication device 5A and the wireless communication device 5B in the communication area (reference number: 002) (symbol: 002). .

  In FIG. 1, the operation mode storage means 13 in the wireless communication device 5A is set in advance to operate as a master. On the other hand, the operation mode storage means 13 in the wireless communication device 5B is set in advance to operate as a slave. Then, in the wireless communication device 5A, a signal for shifting to the registration mode is output to the control means 3 by operating the external input means 9 constituted by a switch or the like. When the control means 3 receives the signal from the external input means 9, the control means 3 shifts to the registration mode (S1 in FIG. 3), determines that it operates as a master from the operation mode stored in the operation mode storage means 13, and performs wireless communication. The means 1 is used to shift to a continuous reception state and wait for a radio message. On the other hand, in the wireless communication device 5B, a signal for shifting to the registration mode is output to the control means 3 by operating the external input means 9 constituted by a switch or the like. When the control means 3 receives the signal from the external input means 9, it shifts to the registration mode (S 2), determines that it operates as a slave from the operation mode stored in the operation mode storage means 13, and determines the wireless communication means 1. The wireless system identification code is all 1, the transmission destination device identification code is 01 as the master device identification code, the transmission source device identification code is the temporary device identification code 8B stored in the temporary device identification code storage means 12 Is transmitted to the wireless communication device 5A (S3).

  For example, as the message format of the registered message 1, the message format shown in FIG. 4 may be used, and a flag may be set in the control code 2 portion to indicate the registered message 1.

  The wireless communication device 5A receives the registration message 1 using the wireless communication unit 1 under the control of the control unit 3 (S3). Next, the control means 3 in the master wireless communication apparatus 5A uses the radio wave condition inquiry means 7 in order to confirm the number of other wireless communication apparatuses using the same frequency as that used in its own system. Then, a radio wave status inquiry message is generated, the wireless communication means 1 is used, the wireless system identification code is all 1, the transmission destination device identification code is broadcast designation FF, and the transmission source device identification code is the device of the wireless communication device 5A. The identification code is set to 01, the frequency A used in the communication in the normal mode is acquired from the frequency storage means 6, and a radio wave status inquiry message is transmitted by broadcast at this frequency A (S4).

  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 a response message is returned (S5).

  The control means 3 in the wireless communication device 5A receives the response message returned from the wireless communication device 5C and the wireless communication device 5D using the wireless communication means 1, and determines the number of response messages (here, 2) as the frequency determination means. 8 is stored. The frequency determination means 8 stores, for example, 1 as a threshold value in advance, and the comparison is made with this threshold value, and the threshold value <the number of response messages is established, so that the own system (the wireless communication device 5A and the wireless communication device) 5B) is changed from the frequency A to the frequency B, and the frequency B is stored in the frequency storage means 6.

  Then, the control means 3 in the wireless communication device 5A uses the wireless communication means 1, and the wireless system identification code is set to all 1 and the transmission destination device identification code is set to the transmission source device identification code of the registered telegram 1. The transmission source device identification code is set to 01 which is the device identification code of the wireless communication device 5A, and the device identification code 02 of the wireless communication device 5B assigned by the control means 3 in the wireless communication device 5A to the transmission data part in FIG. The registered telegram 2 in which the wireless system identification code 001 stored in the system identification code storage means 10 and the frequency B stored in the frequency storage means 6 are set is transmitted to the wireless communication apparatus 5B (S6).

  The control means 3 in the wireless communication device 5B receives the registration message 2, and receives the device identification code 02, the wireless system identification code 001 and the frequency B included in the transmission data part of the registration message 2 as the device identification code storage means 11, The information is stored in the system identification code storage means 10 and the frequency storage means 6.

Then, using the wireless communication means 1, the wireless system identification code 001 notified in the data part of the registered telegram 2, the transmission destination device identification code 01 as the device identification code of the wireless communication device 5A, the transmission source device identification The registration telegram 3 in which the code is set to 02, which is the device identification code of the radio communication device 5B notified in the data part of the registration telegram 2, is transmitted to the radio communication device 5A (S7).
Then, the registration mode is canceled in the wireless communication device 5A and the wireless communication device 5B (S8, S9), and a transition is made to a 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 6 under the control of the control unit 3.

  As described above, in the present embodiment, the number of other wireless communication devices using the same frequency as the own system is obtained from the number of response messages returned to the radio wave status inquiry message, and the frequency Since the determination unit 8 is used to determine the frequency to be used in the own system based on the number of the acquired wireless communication devices, it is not necessary to use an external device such as a setting device or a handy controller, and it is necessary to change the frequency. It is not necessary for the operator who operates the external device to determine whether or not there is any frequency to optimize, and the wireless communication device itself changes autonomously to the optimal frequency for wireless communication. Therefore, it is possible to provide a radio communication system that can be changed to an optimal frequency without any human error and that is easy to install and has excellent installation properties.

  In the present embodiment, the transmission 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 12 in the wireless communication device 5A. A method using a temporary device identification code or a method using a device identification code set as a transmission source device identification code of the registered telegram 1, that is, a temporary device identification code of the wireless communication device 5B 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 to the radio wave status inquiry message is not fixed at 01 and is random. Since multiple wireless communication devices are installed at the same time, it is less likely to receive a response message in response to a radio wave status inquiry message transmitted by another wireless communication device, improving communication reliability. To do.

(Embodiment 2)
FIG. 5 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 a random number generating means 14 for generating a random number 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. Although it has been described that the response message set to 01 which is the device identification code and 02 which is the device identification code of the wireless communication device 5D is returned (S5), in the present embodiment, the control means 3 After receiving the situation inquiry message, a random number is generated using the random number generation means 14, and a response message is returned after the time obtained from the generated random number has elapsed.

  As described above, since the response message returned after receiving the radio wave status inquiry message is returned at random time based on the random number generated by the random number generation means 14, the probability that the response messages collide with each other is reduced. Since the success rate is improved, the number of other wireless communication devices can be acquired more accurately.

  In the previous embodiment, the control means 3 in the wireless communication device 5A receives the response message returned in response to the transmission of the radio wave status inquiry message, and determines the number of response messages (here 2) as the frequency determination means 8. To remember. For example, 1 is stored as a threshold value in advance in the frequency determination means 8, and comparison is made with this threshold value, and the threshold value <the number of response messages is established, so that the own system (the wireless communication device 5A and the wireless communication) 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 6, but in this embodiment, the control means 3 is used when changing the frequency. Then, a random number is generated using the random number generation means 14, a frequency to be used is determined based on the generated random value, and the frequency is stored in the frequency storage means 6. 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 14 in the present embodiment, as a method of 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 operates as a master when set as the master in the operation mode storage means 13, 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 14 is different for each wireless communication device, the value generated by the random number generation unit 14 is less likely to be the same, and the probability that the response messages collide with each other. The number of other wireless communication devices can be acquired more accurately.

  In the present embodiment, the random number generation unit 14 has been described as generating a random number using an average sampling method or a congruent algorithm, but as a simple method that is not a random number, A response message is returned 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 the time to use and the 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 is calculated from the arithmetic expression of (last 1 digit × α) ms (α is the response message) If the method used is determined in consideration of the time required for transmission and the processing time), or the frequency used in advance is A to F, A (hexadecimal) if the last digit is 0 or more and 5 or less Is converted from A to F. When the last digit is 6 or more and 9 or less, 4 (hexadecimal) is added and converted from A to D. When the last digit is A or more and F or less, 0 is added. A method of determining the frequency to be used by adding the values can be considered.

  In the first and second embodiments, the response message for the radio wave status inquiry message is returned by both the wireless communication device 5C (master) and the wireless communication device 5D (slave), so that the number of wireless communication devices Since the wireless system identification code of the wireless communication device 5C as the master is set to the wireless system identification code of the wireless communication device 5D as the slave, the frequency to be used is determined based on this number. A method in which only the master (wireless communication device 5C) returns the response message 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 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. 6 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 15 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 for the radio wave status inquiry message was described as being returned by the wireless communication device 5C (master). However, in this embodiment, the control in the wireless communication device 5C called the master is performed at this time. The means 3 acquires the number of slaves registered in its own device from the slave number storage means 15 that stores the number of slaves, and includes the acquired information on the number of slaves in the response message to the wireless communication device 5A. Send back. As a method of storing the number of slaves in the slave number storage means 15, for example, a method of counting and storing the number of wireless communication devices called slaves in the registration mode is conceivable.

  As described above, the number of slaves is included in the response message sent back to the radio wave status inquiry message, so that the number of other wireless communication devices does not have to be sent back by all wireless communication devices. Since the probability that the response messages collide with each other and the communication success rate is improved, the number of other wireless communication devices can be acquired more accurately. 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. 7, the control means 3 includes lower-layer communication software for performing communication protocol processing specific to each transmission medium, and application software using the transmission medium. And provided at a position sandwiched between the lower-layer communication software and the application software, so that even if different transmission media are used, the application software does not need to be aware of the different transmission media, that is, it functions as a single network. The control means 3 is composed of communication middleware, and when transmitting the radio wave status inquiry message generated by the radio wave status inquiry means 7, the control means 3 sets a flag indicating that the message is to be processed by the lower-layer communication software (for example, FIG. 4). Control code 2 part), wireless communication hand Using a 1, transmits radio waves situation inquiry telegram with broadcast (s4). 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 to be processed by the lower-layer communication software is set, the communication middleware and application software in the higher layer than the lower-layer communication software are notified that the radio wave status inquiry message has been received. Return a response message. If the flag indicating that the message is to be processed by the lower-layer communication software is not set, the communication middleware or application software that is higher than the lower-layer communication software is notified that the radio wave status inquiry message has been received. A response message is returned in response to an instruction from the communication middleware or application software in the layer.

  As described above, since the radio wave status inquiry message is processed by the lower-layer communication software regardless of the application software or communication middleware on the receiving side, as shown in FIG. 7, even when there are a plurality of transmission media, the application software and communication Since there is no need to change middleware, it is highly versatile and 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 part of the wireless communication apparatus of the present invention using a microcomputer or the like. All can be realized easily. Also, program distribution and installation can be simplified by recording on a recording medium or distributing a program using a communication line.

  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 the frequency with the least electronic message is selected and used for communication between the wireless communication device 5A and the wireless communication device 5B. Alternatively, after receiving the registered telegram 1, all available frequencies, for example, the frequencies A to F are sequentially switched to transmit the radio wave status inquiry telegram, and the frequency with the smallest response telegram is selected from the frequencies A to F. A method is also conceivable.

  In the previous embodiment, the frequency used when transmitting the radio wave status inquiry message is acquired from the frequency storage means 8, but a method of randomly determining the frequency used by the control means 3 is also conceivable.

  In the previous embodiment, the frequency for transmitting the registered telegram 1 can be a radio system setting frequency that is a predetermined frequency different from the frequency used in the normal mode other than the registration mode. By doing so, even when it becomes necessary to register a new wireless communication device, each wireless communication device does not transmit / receive the registration telegram 1 at a different frequency, and always transmits / receives at a predetermined frequency. So you can register reliably and quickly.

  In the previous embodiment, as a method of shifting the wireless communication device 5A to the registration mode using the external input unit 9, a signal for the operator to shift to the registration mode using the switch or the like is used. However, a method of transmitting a message for shifting to the registration mode using serial communication or the like from a device connected to the external input means 9 is also conceivable.

  In the previous embodiment, the wireless communication device 5A has been described as transmitting a radio wave status inquiry message after receiving the registration message 1 from the wireless communication device 5B. However, when the wireless communication device 5A is turned on. A method of transmitting a radio wave status inquiry message and storing the frequency used in the frequency storage means 6 is also conceivable.

  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). The wireless communication device 5A has been described as notifying the frequency information to be used when the wireless communication device 5A assigns the wireless system identification code and the device identification code to the wireless communication device 5B. When the communication device 5B is operated as a slave, for example, the external input means 8 in the wireless communication device 5A is turned on, a radio wave status inquiry message is transmitted, and the frequency to be used is stored in the frequency storage means 6. Then, by connecting an external device (such as a personal computer), the frequency information stored in the previous frequency storage means 6 is acquired, and then the external device (such as a personal computer) is connected to the wireless communication device 5B to identify the wireless system. A method of setting a frequency to be used together with the code and the device identification code can be considered.

  In the previous embodiment, the method of determining the frequency to be used between the wireless communication device 5A and the wireless communication device 5B has been described. However, the present invention is not limited to the frequency, and for example, the same bit continues in the data of the wireless message. In order to prevent this, the scramble code used for the scramble conversion performed for encryption can be similarly implemented.

  As described above, the wireless communication system according to the present invention enables the wireless communication device itself to autonomously change to a frequency optimal for wireless communication. In addition to communication of measuring device groups, health equipment groups, etc., it can also be applied to uses such as outdoor wireless data communication such as telemetering and telecontrol.

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. 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 Frequency storage means 7 Radio wave condition inquiry means 8 Frequency determination means 9 External input means 10 Wireless system identification code storage means 11 Equipment identification code storage means 12 Temporary device identification code storage means 14 Random number generation means 15 Slave number storage means

Claims (10)

Wireless communication that includes a device identification code assigned to each wireless communication device and a wireless system identification code assigned to a wireless communication system configured by the wireless communication device in a wireless message, and performs communication using the wireless message In the system, wireless communication means for performing communication wirelessly, frequency storage means for storing a frequency used for communication using the wireless communication means, and other wireless using the frequency stored in the frequency storage means A radio wave status inquiry means for generating a radio wave status inquiry message for confirming the number of communication devices, a frequency determination means for determining a frequency to be used in the own system, and a control means for controlling the respective means, the control The means transmits the radio wave status inquiry message generated by using the radio wave status inquiry unit to another radio using the radio communication unit. Based on the number of response messages transmitted to the communication device and returned to the radio wave status inquiry message, the frequency determination unit is used to determine a frequency to be used in the own system, and the frequency is stored in the frequency storage unit. A wireless communication system to store in Temporary device identification code storage means for storing a temporary device identification code set at random in advance is provided, and the transmission source device identification code in the radio wave status inquiry message is stored in the temporary device identification code storage means instead of the device identification code. The wireless communication system according to claim 1, wherein a temporary device identification code is set. It is provided with random number generating means for generating random numbers under the control of the control means, and the time from receiving the radio wave status inquiry message until returning a response message is based on the random number generated by the random number generating means and responding in a random time The radio | wireless communications system of any one of Claim 1 or 2. A random number generating means for generating a random number under the control of the control means, and the frequency for transmitting the radio wave status inquiry message is a frequency randomly selected from a plurality of predetermined frequencies based on the random number generated by the random number generating means. The wireless communication system according to claim 1, wherein the wireless communication system is used. 5. The wireless communication system according to claim 3, wherein the initial value used for the random number generation means is at least one of a wireless system identification code, a device identification code, a serial number, and a temporary device identification code. In a case where a wireless communication system having the same wireless system identification code is composed of one wireless communication device called a master and a wireless communication device other than the master called a slave, only the master is used as a radio wave status inquiry message. 6. The response means according to claim 1, wherein the control means determines the frequency to be used in the own system based on the number of systems in the wireless communication system instead of the number of wireless communication devices. The wireless communication system according to 1. The master comprises slave number storage means for storing the number of slaves in its own system, and includes the number information of slaves stored in the slave number storage means in the response message returned to the radio wave status inquiry message. Item 7. The wireless communication system according to Item 6. The wireless communication system according to any one of claims 1 to 7, wherein a wireless system identification code that can be received by all wireless communication devices is set in the wireless system identification code included in the radio wave status inquiry message. The control means is provided at a position sandwiched between the lower-layer communication software that performs communication protocol processing specific to each transmission medium, the application software that uses the transmission medium, and the lower-layer communication software and the application software. Even if media is used, the application software does not have to be aware of different transmission media, that is, when it is composed of communication middleware that works to make it appear as a single network, the control means has the radio wave status inquiry message as the lower communication. The wireless communication system according to any one of claims 1 to 8, wherein a flag indicating that the message is processed by software is set and the radio wave status inquiry message is transmitted. The program for functioning at least one part of the means of the radio | wireless communications system of any one of Claims 1-9 with a computer.

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