JP2009088750A - Management device, radio terminal, ad hoc network system, setting changing program of management device, setting changing method of management device, setting changing program of radio terminal, and setting changing method of radio terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely change a frequency channel of the whole terminals in a radio ad hoc network for performing multi-hop transfer. <P>SOLUTION: This management device 100 recognizes a plurality of radio terminals connected to the ad hoc network. A change instruction transmitting part 31 of the management device 100 transmits change instruction information including a changed set value to each radio terminal. Each radio terminal transmits a response signal to the management device 100 when receiving the change instruction information. A response receiving part 32 of the management device 100 determines that each radio terminal has received the change instruction information by receiving the response signal from each radio terminal. When determining that each radio terminal has received the change instruction information, a reset instruction transmitting part 33 of the management device 100 transmits reset instruction information to each radio terminal. When receiving the reset instruction information, each radio terminal changes set values on the basis of the previously received change instruction information. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to, for example, a setting change technique for a frequency channel used in an ad hoc network and a personal area network IDentifier (PANID).

Conventionally, in a wireless communication system, a terminal that wants to change a frequency channel transmits a frequency channel change plan including a destination frequency channel and a transition time. There is a method.
Further, there is a method in which when a wireless terminal has a configuration of a parent device and a child device, and the parent device changes the frequency channel, the child device changes the frequency channel according to the parent device.
JP 2005-303788 A

In the frequency channel changing method in the conventional wireless communication system, a terminal that does not know all the terminals existing in the network transmits a frequency channel change plan, and changes the frequency channel if there is no opposite response. Therefore, there is a problem that there is no guarantee that all terminals can change the frequency channel. Moreover, since the countermeasure when the change of the frequency channel fails is not considered, there is a problem that once the change of the frequency channel fails, the frequency channel cannot be changed again.
In the other method, the frequency channel cannot be changed unless the configuration of the parent device and the child device (parent-child relationship) is taken. Therefore, in a multi-hop wireless ad hoc network in which a plurality of terminals communicate with each other by hopping, there is a problem that the frequency channels of all terminals cannot be changed.
An object of the present invention is to reliably change the frequency channels of all terminals in, for example, a wireless ad hoc network that performs multi-hop transfer.

The management device according to the present invention is, for example, a management device that manages information of a plurality of wireless terminals connected to an ad hoc network,
Change instruction transmission for transmitting change instruction information including changed setting values to the plurality of wireless terminals when changing the setting values of at least one of frequency channels and PANIDs used by the plurality of wireless terminals for communication And
A response receiving unit that receives a response signal transmitted from each wireless terminal when each wireless terminal of the plurality of wireless terminals receives the change instruction information transmitted by the change instruction transmitting unit;
Reset instruction for transmitting, to the plurality of wireless terminals, reset instruction information for changing the setting to the changed setting value included in the change instruction information when the response receiving unit receives a response signal from each of the wireless terminals. And a transmission unit.

  The management apparatus according to the present invention manages information of each wireless terminal, and transmits reset instruction information after confirming that the information of each wireless terminal has received the change instruction information. Therefore, the management device according to the present invention can reliably change the frequency channels of all terminals in a wireless ad hoc network that performs multi-hop transfer.

Embodiment 1 FIG.
In this embodiment, when changing at least one of the frequency channel and PANID used by the radio terminal 200 in the ad hoc network, the settings of all the radio terminals 200 participating in the ad hoc network are surely set. The method of changing will be described.

  In the ad hoc network according to this embodiment, a plurality of wireless terminals 200 and a management apparatus 100 that manages information of the plurality of wireless terminals 200 are connected. In other words, managing the information of the plurality of wireless terminals 200 means that all of the plurality of wireless terminals 200 are recognized.

FIG. 1 is a block diagram showing the configuration of the management apparatus 100 according to this embodiment.
The management apparatus 100 includes a control unit 1, a ROM 2 (Read Only Memory), a RAM 3 (Random Access Memory), a FLASH memory 4, an RF interface unit 5, a radio reception unit 6, a radio transmission unit 7, a common unit 8, an antenna 9, and a reset. A grace time measuring unit 10, a power-on reset circuit 11, an AND gate 12, and a set terminal number counting unit 13 are provided. The control unit 1, ROM 2, RAM 3, FLASH memory 4, RF interface unit 5, and set terminal number count unit 13 are connected via a bus 14.

The control unit 1 reads and interprets the packet received via the RF interface unit 5. Further, the control unit 1 creates a packet to be transmitted and transmits the packet via the RF interface unit 5. Further, the control unit 1 sets parameters used when communicating with the RF interface unit 5.
The control unit 1 includes a change instruction transmission unit 31, a response reception unit 32, a reset instruction transmission unit 33, and a setting change unit 34. These functions will be described in detail in the description of the operation of the management apparatus 100.

The ROM 2 is a read only memory for storing a program and the like for controlling the operation of the control unit 1.
The RAM 3 is a volatile memory that can temporarily read and write transmission / reception data and the like.
The FLASH memory 4 is a non-volatile storage device that stores setting values for communication and the like, and can be read and written even when the supply of power is stopped.

The RF interface unit 5 transmits the transmission packet written from the control unit 1 from the antenna 9 via the wireless transmission unit 7. The RF interface unit 5 temporarily holds a packet received by the antenna 9 via the wireless reception unit 6. The control unit 1 reads out the packet held by the RF interface unit 5 so that reception of the packet is realized.
The RF interface unit 5 includes a frequency channel setting unit 21, a PANID setting unit 22, and an address setting unit 23 in which parameters used for communication are set. The frequency channel setting unit 21, the PANID setting unit 22, and the address setting unit 23 are collectively referred to as a setting value storage unit 35.
A frequency channel to be used is set in the frequency channel setting unit 21.
In the PANID setting unit 22, a PANID to be used is set.
The address setting unit 23 is set with its own network address.

The wireless reception unit 6 converts a wireless signal received via the antenna 9 and the common unit 8 into a digital signal and transfers the digital signal to the RF interface unit 5.
The wireless transmission unit 7 converts the digital signal output from the RF interface unit 5 into a wireless signal and wirelessly transmits the signal via the common unit 8 and the antenna 9.
The common unit 8 switches and connects the input from the antenna 9 to the radio reception unit 6 and the output of the radio transmission unit 7 to the antenna 9.

The reset grace time measuring unit 10 sets the measurement time, and generates the reset signal 15 when the set time has elapsed.
The power-on reset circuit 11 generates a power-on reset signal 16 that resets the control unit 1 when the power is turned on.
The AND gate 12 outputs a signal for resetting the control unit 1 to the reset terminal of the control unit 1 when either the reset signal 15 or the power-on reset signal 16 is generated. Here, when the signal values are represented by “0” and “1”, the reset signal 15 and the power-on reset signal 16 are “0”. That is, the AND gate 12 outputs the logical product “0” to the control unit 1 when either one of the reset signal 15 and the power-on reset signal 16 is output. The control unit 1 is reset when “0” is input. That is, the control unit 1 is reset when either the reset signal 15 or the power-on reset signal 16 is generated.
The set terminal number counting unit 13 counts the number of terminals of the wireless terminal 200 according to the count signal 17 transmitted from the control unit 1.

  In the above description, the control unit 1 is an example of a processing device, and is, for example, a circuit such as a CPU (Central Processing Unit) or a DSP (Digital Signal Processor). The ROM 2, RAM 3, and FLASH memory 4 are examples of a storage device, and may be, for example, an optical disk or a magnetic disk. The RF interface unit 5, the wireless reception unit 6, the wireless transmission unit 7, and the common unit 8 are, for example, communication boards and are examples of communication devices.

FIG. 2 is a block diagram showing a configuration of radio terminal 200 according to this embodiment.
Only the configuration of the wireless terminal 200 that is different from the management device 100 will be described.
The wireless terminal 200 does not include the set terminal count unit 13.
Further, the control unit 1 of the wireless terminal 200 has a function different from that of the control unit 1 of the management apparatus 100. The control unit 1 of the wireless terminal 200 includes a check unit 41, a change instruction information reception unit 42, a response signal transmission unit 43, a reset instruction information reception unit 44, and a setting change unit 45. These functions will be described in detail in the description of the operation of the wireless terminal 200.
In radio terminal 200, frequency channel setting unit 21, PANID setting unit 22, and address setting unit 23 are collectively referred to as setting value storage unit 46.

Next, the format of a packet transmitted by the management apparatus 100 and the wireless terminal 200 will be described.
FIG. 3 is a diagram illustrating data formats of a setting change instruction packet (change instruction information) and a setting change response packet (response signal).
The setting change instruction packet includes a header part and a data part.
The header section includes a PANID field, a physical destination field, a physical source field, a final destination field, a source field, and a TTL (Time To Live) field.
The PANID field describes the PANID being used. The physical destination field describes the actual destination of the packet. That is, the address of the wireless terminal 200 that should receive this packet next is described. The physical transmission source field describes the actual transmission source of the packet. That is, the physical transmission source field describes the address of the wireless terminal 200 that transmits the packet. The final destination field describes a destination address where the packet is finally transmitted. The sender field describes the sender address that originally sent the packet. A predetermined value is written in the TTL field. The value described in the TTL field is decremented by 1 every time a packet hops, and when it reaches 0, the packet is discarded.
The data portion includes a command code field, a changed frequency channel field, a changed PANID field, and a reset grace time field.
In the command code field, a command code for instructing a setting change is described. That is, it is possible to determine that the packet is a setting change instruction packet by referring to the value of the command code field. The changed frequency channel field describes the changed frequency channel. The changed PANID field describes the changed PANID. The reset grace time field describes a predetermined time. If a reset instruction packet (to be described later) is not received even after a predetermined time described in the reset grace time field has elapsed after receiving the setting change instruction packet, the control unit 1 is reset.

Like the setting change instruction packet, the setting change response packet includes a header portion and a data portion.
The header part of the setting change response packet is the same as that of the setting change instruction packet.
The data part includes a command code field and an execution result code field.
In the command code field, a response command code for the setting change instruction is described. That is, referring to the value of the command code field, it can be determined that the packet is a setting change response packet. The execution result code field describes success or failure of the execution result.

FIG. 4 is a diagram illustrating a data format of a reset instruction packet (reset instruction information) and a reset response packet.
The reset instruction packet includes a header part and a data part.
The header part of the reset instruction packet is the same as that of the setting change instruction packet.
The data portion of the reset instruction packet includes a command code field, a reset grace time field, and a response necessity field.
In the command code field, a command code for instructing reset is described. That is, by referring to the value of the command code field, it can be determined that the packet is a reset instruction packet. The reset grace time field describes a predetermined time. When a predetermined time described in the reset grace time field has elapsed after receiving the reset instruction packet, the control unit 1 is reset and the setting is changed. In the response necessity field, information indicating whether or not a response is requested to the wireless terminal 200 that has received the reset instruction packet is described. That is, when no response is required in the response necessity field, the wireless terminal 200 does not transmit a reset response packet to the management apparatus 100.

  The reset response packet is the same as the setting change response packet. However, a response command code for the reset instruction is described in the command code field. That is, by referring to the value of the command code field, it can be determined that the packet is a reset response packet.

Next, operations of the management apparatus 100 and the wireless terminal 200 according to this embodiment will be described.
First, an outline of the operation will be described.
(1) The management device 100 unicasts a setting change instruction packet to the wireless terminal 200 in a predetermined order.
(2) Receiving the setting change instruction packet, the wireless terminal 200 transmits a setting change response packet to the management apparatus 100.
(3) When the management apparatus 100 receives the setting change response packet, that is, confirms that the wireless terminal 200 has received the setting change instruction packet, the management apparatus 100 unicasts the setting change instruction packet to the next wireless terminal 200.
(4) When (1) to (3) are repeated, the setting change instruction packet is transmitted to all the wireless terminals 200, and when the setting change response packet is received from all the wireless terminals 200, the management apparatus 100 receives all the wireless terminals 200. Broadcast a reset instruction packet to the terminal 200.
(5) The wireless terminal 200 that has received the reset instruction packet changes the setting based on the information of the setting change instruction packet. Similarly, the management apparatus 100 changes the setting.
Here, the description has been made assuming that no reset response packet is transmitted from the wireless terminal 200. That is, the description has been made assuming that the reset necessity packet response unnecessary field is set as unnecessary. Similarly, the following description will be made assuming that no reset response packet is transmitted from the wireless terminal 200.

Next, the operation will be described in detail with reference to the drawings.
First, the system configuration of the premise ad hoc network will be described. FIG. 5 is a diagram illustrating an example of a system configuration of an ad hoc network. In FIG. 5, to simplify the description, the ad hoc network includes one management apparatus 100 and a radio terminal 200A, a radio terminal 200B, and a radio terminal 200C. In addition, it is assumed that the wireless terminal 200D is an apparatus that belongs to another system, and that the wireless terminal reaches the management apparatus 100 and the wireless terminal 200A.
In the configuration of FIG. 5, the operation when the network operating with the current PANID PID0 and the frequency channel CH0 is changed to operate with the PANID PID1 and the frequency channel CH1 will be described. In other words, CH0 is set in the frequency channel setting unit 21 provided in the RF interface unit 5 between the management apparatus 100 and each wireless terminal 200, and PID0 is set in the PANID setting unit 22. An operation of changing the setting of the frequency channel setting unit 21 included in the RF interface unit 5 of the management apparatus 100 and each wireless terminal 200 to CH1 and changing the setting of the PANID setting unit 22 to PID1 will be described.

First, the premise items will be described.
In FIG. 5, it is assumed that the wireless terminal 200A and the wireless terminal 200B have entered the management apparatus 100, and the wireless terminal 200C has entered the wireless terminal 200A. For example, in ZigBee or the like, an operation in which a network address is given from an entry destination by the entry operation is performed, but the operation at the time of entry may be the same as that of ZigBee or the like, for example. Due to the entry operation or switch setting, NWADR 100 is assigned to the management device 100, NWADR 200 is assigned to the wireless terminal 200A, NWADR 210 is assigned to the wireless terminal 200B, and NWADR 220 is assigned to the wireless terminal 200C. It is assumed that it is stored in the address storage area.
In the initialization operation after the power is turned on, the management device 100 and the control unit 1 of each wireless terminal 200 read the set values of the frequency channel, PANID, and network address stored in the FLASH memory 4. Then, the control unit 1 of the management apparatus 100 and each wireless terminal 200 includes CH0 for the frequency channel setting unit 21 of the RF interface unit 5, PID0 for the PANID setting unit 22, and a network address for the address setting unit 23. Set.
In addition, as an operation after entry, each wireless terminal 200 transmits its own address information to the management apparatus 100. Here, it is assumed that each wireless terminal 200 has obtained information indicating which terminal is the management apparatus 100 at the time of entry. Then, for example, the RAM 3 of the management apparatus 100 stores a device address table corresponding to the network address corresponding to all terminals entering the network.
Further, for example, a route construction operation is performed in an operation in which each wireless terminal 200 transmits its own address information to the management apparatus 100. In the RAM 3 of the management device 100 and each wireless terminal 200, there is a route table in which an entry indicating which address the wireless terminal 200 should be transmitted next is registered in order to transmit to the final destination address. Shall be created. Any route construction operation may be used.

Next, the operation when it is necessary to change the frequency channel and the PANID under the above assumption will be described with reference to FIGS. FIG. 6 is a flowchart showing an operation when the management apparatus 100 according to this embodiment transmits a setting change instruction packet. FIG. 7 is a flowchart showing an operation when the wireless terminal 200 according to this embodiment receives a setting change instruction packet. FIG. 8 is a flowchart showing an operation when the management apparatus 100 according to this embodiment transmits a reset instruction packet. FIG. 9 is a flowchart showing an operation when the radio terminal 200 according to this embodiment receives a reset instruction packet.
Before the following operation, the control unit 1 of the management apparatus 100 writes the changed frequency channel value CH1 into the frequency channel storage area of the FLASH memory 4, and the changed PANID value PID1 into the PANID storage area of the FLASH memory 4 Write down.

First, the operation when the management apparatus 100 transmits a setting change instruction packet will be described with reference to FIG.
In (S101), the control unit 1 (change instruction transmission unit 31) of the management apparatus 100 initializes the entry read pointer of the device address table in which information of each wireless terminal 200 is registered. In other words, the device address table information can be read in order from the top.
Here, it is assumed that the addresses of the wireless terminal 200A, the wireless terminal 200B, and the wireless terminal 200C are registered in the device address table in order. That is, the entry read pointer of the device address table is in a state of reading the wireless terminal 200A.

In (S <b> 102), the control unit 1 (change instruction transmission unit 31) counts the number of entries in the device address table to obtain the number of wireless terminals 200 that have entered the network, and sets the number in the set terminal number counting unit 13. .
In this example, since three wireless terminals 200 have entered the network, “3” is set in the set terminal count section 13.

In (S103), the control unit 1 (change instruction transmission unit 31) reads the address of the wireless terminal 200 pointed to by the entry read pointer in the device address table.
Here, since the entry read pointer points to the wireless terminal 200A that is the first entry in the device address table, the control unit 1 of the management apparatus 100 reads the address of the wireless terminal 200A.

In (S104), the control unit 1 (change instruction transmission unit 31) creates a setting change instruction packet. Specifically, the control unit 1 (change instruction transmission unit 31) sets the following information in each field of the setting change instruction packet.
In the PANID field, the currently operating PID 0 set in the PANID setting unit 22 is set.
In the physical transmission destination field, the next transmission destination address for transmission to the address NWADR 200 of the wireless terminal 200A searched from the route table is set. Since it reaches directly to the wireless terminal 200A, the NWADR 200 that is the address of the wireless terminal 200A is set.
The address NWADR100 of the management apparatus 100 is set in the physical transmission source field.
The address NWADR 200 of the wireless terminal 200A is set in the final destination address field.
The NWADR 100 of the management apparatus 100 is set in the source address field.
The maximum number of hops allowed in this network is set in the TTL field.
A setting change instruction command code is set in the command field.
CH1 is set in the changed frequency channel field.
PID1 is set in the changed PANID field.
In the reset grace time field, TIM_RHL that specifies a sufficiently long time to finish giving instructions to all terminals is set.

In (S105), the control unit 1 (change instruction transmission unit 31) transmits a setting change instruction packet.
The control unit 1 (change instruction transmission unit 31) writes a setting change instruction packet in the RF interface unit 5. Then, the wireless transmission unit 7 converts the setting change instruction packet written in the RF interface unit 5 into a radio signal using the frequency channel of the channel CH0 set in the frequency channel setting unit 21 of the RF interface unit 5. The setting change instruction packet is wirelessly transmitted via the common unit 8 and the antenna 9.

In (S106), the control unit 1 (response receiving unit 32) checks whether or not a setting change response packet has been received.
When receiving the setting change instruction packet, the wireless terminal 200 transmits a setting change response packet to the management apparatus 100. That is, it is possible to confirm that the wireless terminal 200 has received the setting change instruction packet when the control unit 1 (response receiving unit 32) receives the setting change response packet.
The control unit 1 (response receiving unit 32) confirms the source address field, command code field, and execution result field of the received setting change response packet, and transmits the setting change instruction packet destination (in this case, the wireless terminal 200A). Is confirmed to be a setting change response packet transmitted, and whether the processing is successful.
When the setting change response packet is received (Yes in S106), the process proceeds to (S108). On the other hand, when the setting change response packet has not been received (No in S106), the process proceeds to (S107).

In (S107), the control unit 1 (response receiving unit 32) checks whether or not a predetermined time has elapsed since the transmission of the setting change instruction packet. If the predetermined time has elapsed, the control unit 1 (response receiving unit 32) determines that the time is out, and the setting change instruction packet does not reach the wireless terminal 200 (here, the wireless terminal 200A). It is considered to be.
When the predetermined time has elapsed (Yes in S107), it is determined that the setting change instruction packet has not arrived at the wireless terminal 200A (S105), and the control unit 1 (response receiving unit 32) returns the setting change instruction packet. resend. That is, until the wireless terminal 200A receives the setting change instruction packet, the wireless terminal 200A repeatedly transmits the setting change instruction packet to the wireless terminal 200A.
On the other hand, if the predetermined time has not elapsed (No in S107), the process returns to (S106), and it is confirmed whether a setting change response packet has been received again.

  In (S108), since it has been confirmed that the wireless terminal 200 has received the setting change instruction packet in (S106), the control unit 1 (change instruction transmitting unit 31) outputs the count signal 17 and counts the number of set terminals. The value set in the unit 13 is counted down by one.

In (S109), after counting down in (S108), the control unit 1 (change instruction transmission unit 31) reads the current value of the set terminal count unit 13 and checks whether the current value is 0 or not.
If the current value is 0 (Yes in S109), the setting change instruction packet transmission process is terminated. On the other hand, if the current value is not 0 (No in S109), the process proceeds to (S110).
Here, the current value of the set terminal number counting unit 13 is 2. Therefore, it can be seen that there are still wireless terminals 200 to which the setting change instruction packet should be transmitted. Accordingly, the process proceeds to (S110) and the process is continued.

In (S110), the control unit 1 (change instruction transmission unit 31) advances the entry read pointer of the device address table to the next.
Here, the entry read pointer in the device address table is in a state of reading the wireless terminal 200B.
Then, the process returns to (S103).

Here, the management apparatus 100 subsequently reads the address of the wireless terminal 200B from the device address table (S103), creates and transmits a setting change instruction packet (S104, S105). When the setting change response packet is received from the wireless terminal 200B (Yes in S106), the setting terminal number counting unit 13 is counted down by 1 (S108). However, since the current value of the set terminal count unit 13 is not 0 (No in S109), the entry read pointer in the device address table is advanced to the next (S110), and the process returns to (S103).
Then, the address of the wireless terminal 200C is read from the device address table (S103), and a setting change instruction packet is created and transmitted (S104, S105). When the setting change response packet is received from the wireless terminal 200C (Yes in S106), the setting terminal number counting unit 13 is counted down by 1 (S108). Since the current value of the set terminal count unit 13 is 0 (Yes in S109), it is determined that the transmission of the setting change instruction packet to all the radio terminals 200 has been completed normally, and the process ends.

Next, an operation when the wireless terminal 200 receives the setting change instruction packet will be described with reference to FIG.
Here, description will be made assuming that the control unit 1 (change instruction transmitting unit 31) has transmitted the setting change instruction packet to the radio terminal 200A in (S105).

In (S201), the RF interface unit 5 of the wireless terminal 200 receives the setting change instruction packet.
Here, the wireless terminal 200A receives the setting change instruction packet wirelessly transmitted from the management apparatus 100. First, the signal is input to the wireless reception unit 6 via the antenna 9 and the common unit 8 of the wireless terminal 200A. The setting change instruction packet is converted into a digital signal and input to the RF interface unit 5. The RF interface unit 5 performs serial-parallel conversion from the digital signal and temporarily stores it as received data in a buffer inside the RF interface unit 5.

Here, the RF interface unit 5 checks the PANID. The RF interface unit 5 compares the value of the PANID field of the received setting change instruction packet with the value set in the PANID setting unit 22. If the comparison result does not match and the value of the PANID field is not a broadcast PANID, the received setting change instruction packet is discarded.
Further, the RF interface unit 5 checks the physical transmission destination. The RF interface unit 5 compares the value of the physical transmission destination field of the received setting change instruction packet with its own address set in the address setting unit 23. If the comparison result does not match and the value of the physical destination field is not a broadcast address, the setting change instruction packet is discarded.
Here, both the value in the PANID field of the setting change instruction packet and the value set in the PANID setting unit 22 are “PID0” and match, and the value in the physical transmission destination field and the address setting unit 23 are set. Since both of them are “NWADR200” and match, the setting change instruction packet is not discarded.

Next, the control unit 1 (check unit 41) checks the final destination. The control unit 1 (check unit 41) compares the value of the final destination field of the received setting change instruction packet with its own address set in the address setting unit 23. If the comparison result does not match or the value of the final destination field is a broadcast address, the setting change instruction packet is transferred and the process is terminated.
Here, it is a setting change instruction packet addressed to the wireless terminal 200A, and since both the value of the final destination field and its own address are “NWADR200” and match, the process proceeds to (S202).

In (S <b> 202), the control unit 1 (change instruction information receiving unit 42) temporarily stores the received setting change instruction packet information in the FLASH memory 4. To temporarily store the information of the setting change instruction packet means that the information of the setting change instruction packet is not set in the RF interface unit 5 but is simply stored in the FLASH memory 4.
Specifically, the control unit 1 (check unit 41) first checks the command code field of the setting change instruction packet. Here, a setting change instruction command code is set in the received setting change instruction packet. For this reason, the control unit 1 (check unit 41) calls the control unit 1 (change instruction information receiving unit 42), and the control unit 1 (change instruction information receiving unit 42) enters the changed frequency field of the setting change instruction packet. The set value CH1 is taken out and written into the frequency channel storage area of the FLASH memory 4. The control unit 1 (change instruction information receiving unit 42) writes the value PID1 set in the PANID field into the PANID storage area of the FLASH memory 4. Then, the control unit 1 (change instruction information receiving unit 42) sets the value TIM_RHL set in the reset window time field to the reset window measuring unit 10 and starts time measurement.
That is, among the packets received by the RF interface unit 5, the setting change instruction packet is received and processed by the control unit 1 (change instruction information receiving unit 42).

In (S203), the control unit 1 (response signal transmission unit 43) creates a setting change response packet.
Specifically, the control unit 1 (response signal transmission unit 43) sets the following information in each field of the setting change response packet.
In the PANID field, PID0 set in the PANID setting unit 22 and currently operating is set.
In the physical transmission destination field, the next transmission destination address when transmitting to the address NWADR 100 of the management apparatus 100 searched from the route table is set. Since it reaches the management apparatus 100 directly, the NWADR 100 that is the address of the management apparatus 100 is set.
The address of the wireless terminal 200A is set as the physical transmission source address.
In the final destination address field, the address NWADR100 of the management apparatus 100 is set.
The address NWADR 200 of the wireless terminal 200A is set in the source address field.
The maximum number of hops allowed in this network is set in the TTL field.
A setting change response command code is set in the command code field.
A code indicating success is set in the execution result code field.

In (S204), the control unit 1 (response signal transmission unit 43) transmits a setting change response packet.
The control unit 1 (response signal transmission unit 43) writes the setting change response packet in the RF interface unit 5. Then, the wireless transmission unit 7 converts the setting change response packet written in the RF interface unit 5 into a radio signal using the frequency channel of the channel CH0 set in the frequency channel setting unit 21 of the RF interface unit 5. The setting change response packet is wirelessly transmitted via the common unit 8 and the antenna 9.
The setting change response packet transmitted in (S204) is received by the control unit 1 (response receiving unit 32) of the management apparatus 100 and confirmed in (S106).

When the value of the final destination field does not match its own address in (S201) and the setting change instruction packet is transferred, the control unit 1 (check unit 41) copies the received setting change instruction packet, In the physical destination field, the next destination address in the case of transmission toward the final destination address searched from the route table is set, the own address is set in the physical source, and the TTL is reduced by one. And the relay transmission to the final destination is performed by writing in the RF interface unit 5.
On the other hand, when the value of the final destination field is a broadcast address, the control unit 1 (check unit 41) decrements the value of the TTL field of the setting change instruction packet by 1, and determines whether the result is 0 or not. To do. If the result is not 0, the control unit 1 (check unit 41) changes the TTL field of the received packet to a value minus -1, changes the physical source field to its own address, and broadcasts the packet again. On the other hand, if the result is 0, the broadcast is not performed again, but the contents indicated in the received packet are executed. That is, the process proceeds to (S202).

  In (S201), the wireless terminal 200B similarly receives the setting change instruction packet. However, since the value of the physical transmission destination field does not match the network address set in the address setting unit 23 and the value of the physical transmission destination field is not a broadcast address indicating broadcast, the setting change instruction packet is Discarded.

  In (S204), the wireless terminal 200C receives the setting change response packet transmitted wirelessly. However, the wireless terminal 200C performs PANID check, physical transmission destination check, and final destination check. Since the wireless terminal 200C is not a physical transmission destination, the received setting change response packet is discarded. .

  Even when the management apparatus 100 receives a packet, the PANID check, the physical transmission destination check, and the final destination check performed by the wireless terminal 200 are performed on the received packet in (S201).

When the management apparatus 100 transmits a setting change instruction packet addressed to the wireless terminal 200B, the wireless terminal 200B receives the setting change instruction packet addressed to itself, checks the setting change instruction packet (S201), and temporarily sets the setting value. (S202). Then, the radio terminal 200B creates and transmits a setting change response packet (S203, S204). That is, the wireless terminal 200B that has received the setting change instruction packet addressed to itself stores the changed frequency channel CH1 and the changed PANID value PID1 in the FLASH memory 4 in the same manner as the wireless terminal 200A, and measures the reset grace time. After the unit 10 sets TIM_RHL to start time measurement, a setting change response packet is transmitted.
Subsequently, when the management apparatus 100 transmits a setting change instruction packet addressed to the wireless terminal 200C, the wireless terminal 200C receives the setting change instruction packet addressed to itself, checks the setting change instruction packet (S201), and sets the setting value. Temporarily store (S202). Then, the radio terminal 200C creates and transmits a setting change response packet (S203, S204). That is, the setting change instruction packet addressed to the wireless terminal 200C is relayed by the wireless terminal 200A and received by the wireless terminal 200C. Similarly to the wireless terminal 200A, the wireless terminal 200C stores the changed frequency channel CH1 and the changed PANID value PID1 in the FLASH memory 4, and the reset grace time measuring unit 10 sets TIM_RHL to start time measurement. After being performed, a setting change response packet is transmitted. The setting change response packet is relayed by the wireless terminal 200A and received by the management apparatus 100.

Next, an operation when the management apparatus 100 transmits a reset instruction packet will be described with reference to FIG.
When the management apparatus 100 determines that the transmission of the setting change instruction packet to all the wireless terminals 200 has been normally completed, the management apparatus 100 transmits a reset instruction packet to each wireless terminal 200. That is, when the setting change instruction packet transmission process illustrated in FIG. 6 is normally completed, a reset instruction packet is transmitted to each wireless terminal 200.

In (S301), the control unit 1 (reset instruction transmission unit 33) of the management apparatus 100 creates a reset instruction packet. Specifically, the control unit 1 (reset instruction transmission unit 33) sets the following information in each field of the reset instruction packet.
In the PANID field, PID0 set in the PANID setting unit 22 and currently operating is set.
A broadcast address is set in the physical destination field. That is, here, it transmits to all the radio | wireless terminals 200 simultaneously.
The address NWADR100 of the management apparatus 100 is set in the physical transmission source field.
A broadcast address is set in the final destination address field.
The NWADR 100 of the management apparatus 100 is set in the source address field.
The maximum number of hops allowed in this network is set in the TTL field.
A reset instruction command code is set in the command field.
A minimum value TIM_MIN that can be set is set in the reset grace period field.
No response is required in the response necessity field.

In (S302), the control unit 1 (reset instruction transmission unit 33) transmits a reset instruction packet.
The control unit 1 (reset instruction transmission unit 33) writes a reset instruction packet in the RF interface unit 5. Then, the wireless transmission unit 7 converts the reset instruction packet written in the RF interface unit 5 into a radio signal using the frequency channel of the channel CH0 set in the frequency channel setting unit 21 of the RF interface unit 5. The reset instruction packet is wirelessly transmitted via the common unit 8 and the antenna 9.

  In (S303), after transmitting the reset instruction packet, the control unit 1 (reset instruction transmission unit 33) sets the reset grace time (TIM_MIN) in the reset grace time measurement unit 10 and starts measurement of the reset grace time. .

In (S304), when the reset grace time elapses, the control unit 1 (setting change unit 34) changes the set value.
Specifically, when the reset grace time elapses, the reset grace time measuring unit 10 generates the reset signal 15. Then, the reset terminal of the control unit 1 is driven via the AND gate 12, and the control unit 1 is reset.
When reset, the control unit 1 executes an initialization process. In the initialization process, the control unit 1 (setting change unit 34) is stored in the CH1 stored in the frequency channel storage area of the FLASH memory 4, the PID1 stored in the PANID storage area, and the self address storage area. The own network address is set in the frequency channel setting unit 21, the PANID setting unit 22, and the address setting unit 23 of the RF interface unit 5, respectively. That is, the set value is changed. That is, the management apparatus 100 starts an operation with the same frequency channel and PANID as the setting value instructed to each wireless terminal 200 by the setting change instruction packet.

Next, an operation when the wireless terminal 200 receives a reset instruction packet will be described with reference to FIG.
Here, it is assumed that the control unit 1 (reset instruction transmission unit 33) has transmitted a reset instruction packet to the wireless terminal 200 in (S302).

In (S401), the RF interface unit 5 of the wireless terminal 200 receives the reset instruction packet.
Each wireless terminal 200 receives a reset instruction packet wirelessly transmitted from the management apparatus 100. First, the signal is input to the wireless reception unit 6 via the antenna 9 and the common unit 8 of each wireless terminal 200. The reset instruction packet is converted into a digital signal and input to the RF interface unit 5. The RF interface unit 5 performs serial-parallel conversion from the digital signal and temporarily stores it as received data in a buffer inside the RF interface unit 5.

Here, the RF interface unit 5 performs a PANID check and a physical transmission destination check performed by the wireless terminal 200 in (S201).
Here, both the value in the PANID field of the reset instruction packet and the value set in the PANID setting unit 22 match “PID0”, and the value in the physical destination field is the broadcast address. The instruction packet is not discarded.

Further, the control unit 1 (check unit 41) checks the final destination performed by the wireless terminal 200 in (S201).
Here, a broadcast address is specified in the final destination field of the reset instruction packet. The control unit 1 (check unit 41) that has received the reset instruction packet specifying the broadcast address decrements the value of the TTL field by 1, and determines whether or not the result is 0. If the result is not 0, the control unit 1 (check unit 41) changes the TTL field of the received packet to a value minus -1, changes the physical source field to its own address, and broadcasts the packet again. On the other hand, if the result is 0, the broadcast is not performed again, but the contents indicated in the received packet are executed.
That is, here, finally, all the wireless terminals 200 receive the broadcast packet of the reset instruction.

In (S <b> 402), the control unit 1 (reset instruction information receiving unit 44) sets the reset grace time field (TIM_MIN) set in the reset grace time field of the reset command to the reset grace time measuring unit 10 and starts measurement. Let
Specifically, the control unit 1 (check unit 41) first checks the command code field of the setting change instruction packet. Here, a reset instruction command code is set in the received setting change instruction packet. For this reason, the control unit 1 (reset instruction information receiving unit 44) is called by the control unit 1 (check unit 41), and the control unit 1 (reset instruction information receiving unit 44) is set in the reset grace time field of the reset instruction packet. Set the reset grace time (TIM_MIN).
That is, among the packets received by the control unit 1 (check unit 41), the reset instruction packet is received and processed by the control unit 1 (reset instruction information reception unit 44).

In (S403), when the reset grace time elapses, the control unit 1 (setting change unit 45) changes the set value.
Specifically, similarly to the management device 100, when the reset grace time elapses, the reset grace time measurement unit 10 generates the reset signal 15. Then, the reset terminal of the control unit 1 is driven via the AND gate 12, and the control unit 1 is reset.
When reset, the control unit 1 executes an initialization process. In the initialization process, the control unit 1 (setting change unit 45) is stored in the CH1 stored in the frequency channel storage area of the FLASH memory 4, the PID1 stored in the PANID storage area, and the self address storage area. The own network address is set in the frequency channel setting unit 21, the PANID setting unit 22, and the address setting unit 23 of the RF interface unit 5, respectively. That is, the set value is changed. That is, the wireless terminal 200 starts to operate with the changed frequency channel and PANID instructed by the setting change instruction packet.
Here, even if there is a wireless terminal 200 that has failed to receive the reset instruction packet, the wireless terminal 200 has elapsed the time set in the reset window measurement unit 10 when the setting change instruction packet is received. At that time, the reset signal 15 is generated and the control unit 1 is reset.

As described above, according to the management apparatus 100 and the wireless terminal 200 according to this embodiment, the management apparatus 100 transmits the frequency channel and PANID setting change instruction packet to all the wireless terminals 200 in the network. Confirm that a response is returned. Therefore, the frequency channels and PANIDs of all the radio terminals 200 can be changed reliably.
In addition, after confirming that the setting change instruction packets for all the wireless terminals 200 have arrived, the frequency channel and PANID are changed by executing the reset with the minimum grace period. Migration can be performed quickly. Therefore, the period during which data collection is impossible can be minimized.
Further, the changed frequency channel and PANID are stored in a non-volatile storage device, and the setting is performed in the initialization process after reset. Therefore, the system operation can be started with a desired frequency channel and PANID even when the entire network or a part of the power supply is cut off. Therefore, a more reliable wireless ad hoc network system can be constructed.

Here, wireless terminal 200 does not transmit a reset response packet because response unnecessary is set in the response necessity field of the received reset instruction packet.
Of course, if the response required field is set in the response necessity field of the received reset instruction packet, the wireless terminal 200 transmits a reset response packet to the management apparatus 100. The management apparatus 100 can confirm that the wireless terminal 200 has received the reset instruction packet by receiving the reset response packet from the wireless terminal 200. When the reset response packet is not transmitted from the wireless terminal 200 even after the predetermined time has elapsed, the management apparatus 100 may retransmit the reset instruction packet to the wireless terminal 200. In this case, the reset instruction packet unicast may be transmitted only to the wireless terminal 200 to which the reset response packet is not transmitted.

  In the above description, the example in which the setting change instruction packet is unicast transmitted to each wireless terminal 200 has been described. However, the broadcast instruction may be transmitted by designating the broadcast address as the transmission destination, and after confirming that the setting change response packets have been returned from all the wireless terminals 200, the reset instruction packet may be transmitted.

  In the above description, the management apparatus 100 is configured as a single device. However, the wireless terminal 200 is placed in a portion corresponding to the management apparatus 100, and the personal computer or server connected to the wireless terminal 200 via a serial or LAN is used. The management apparatus 100 may be configured.

  Further, in the above description, when the setting change response packet is not sent from the wireless terminal 200 even after a predetermined time, the setting change instruction packet is retried. However, whether or not to perform retry transmission is arbitrary.

That is, the management apparatus 100 according to this embodiment
A management device 100 that manages information of a plurality of wireless terminals 200 connected to an ad hoc network;
Change in which change instruction information including changed setting values is transmitted to the plurality of wireless terminals 200 when the setting values of at least one of frequency channels and PANIDs used by the plurality of wireless terminals 200 for communication are changed An instruction transmitter 31;
A response receiving unit 32 that receives a response signal transmitted from each wireless terminal 200 when each wireless terminal 200 of the plurality of wireless terminals 200 receives the change instruction information transmitted by the change instruction transmitting unit 31;
When the response receiving unit 32 receives a response signal from each of the wireless terminals 200, reset instruction information for changing the setting to the changed setting value included in the change instruction information is transmitted to the plurality of wireless terminals 200. And a reset instruction transmission unit 33.

In addition, the change instruction transmission unit 31 of the management apparatus 100 unicasts the change instruction information to each of the wireless terminals 200 in a predetermined order, and a response signal transmitted from the wireless terminal 200 that is the transmission destination of the change instruction information. Is received by the response receiving unit 32, and when the response receiving unit 32 receives a response signal, the change instruction information is transmitted to the next radio terminal 200.

In addition, the wireless terminal 200 according to this embodiment
A wireless terminal 200 connected to an ad hoc network and managed by the management apparatus 100;
A setting value storage unit 46 for storing setting values of at least one of the frequency channel being used and the PANID;
A change instruction information receiving unit 42 that receives change instruction information including a setting value after changing at least one of the frequency channel and the PANID from the management apparatus 100;
A reset instruction information receiving unit 44 for receiving reset instruction information for urging change of a setting value from the management apparatus 100;
When the reset instruction information receiving unit 44 receives the reset instruction information, the setting value stored in the setting value storage unit 46 is changed to the setting value after change included in the change instruction information received by the change instruction information receiving unit 42. And a setting changing unit 45 for changing to the above.

Embodiment 2. FIG.
In the first embodiment, only the own setting values (frequency channel and PANID) stored in the FLASH memory 4 are changed. In this embodiment, at the timing of changing the setting value of itself, in addition to the setting value of itself, the parent device (parent wireless terminal 200 or management apparatus 100), the child device (child wireless terminal 200), and before the change The frequency channel and PANID stored in the FLASH memory 4 are also changed for the device (wireless terminal 200) using the PANID and frequency channel that was used.

FIG. 10 is a diagram illustrating information stored in the FLASH memory 4 before and after the wireless terminal 200A receives the setting change instruction packet in the network configuration illustrated in FIG.
As shown in FIG. 10, the FLASH memory 4 of the wireless terminal 200 stores not only the setting value information of itself but also the setting value information of the other wireless terminal 200 and the management device 100. Information used for its own setting (setting of the frequency channel setting unit 21, the PANID setting unit 22, and the address setting unit 23) is its own set value information, but other information is used when communicating with other wireless terminals 200 or the like. The setting value information of the wireless terminal 200 or the like may be used. For this reason, when the setting value of the other wireless terminal 200 or the like is changed, it is desirable that the setting value information of the other wireless terminal 200 stored in the FLASH memory 4 is also changed.
Therefore, in this embodiment, when the own setting change is performed, it is assumed that the same setting change is also made in the wireless terminal 200 and the like participating in the same network as the own one. Rewrite information.
Hereinafter, the operation of radio terminal 200 according to this embodiment will be described by taking as an example a process when radio terminal 200A receives a setting change instruction packet for changing the frequency channel to CH1 and PANID to PID1.
The operation of the management apparatus 100 is the same as that in the first embodiment.

Radio terminal 200A operating with frequency channel CH0 and PANID PID0 receives a setting change instruction packet in which the changed frequency channel field is CH1, the changed PANID field is PID1, and the reset grace time field is set to TIM_RHL. . Then, the control unit 1 (change instruction information receiving unit 42) of the wireless terminal 200A rewrites the frequency channel storage area corresponding to itself in the FLASH memory 4 from CH0 to CH1, and rewrites the PANID storage area from PID0 to PID1.
Furthermore, the control unit 1 (change instruction information receiving unit 42) of the radio terminal 200A according to the present embodiment changes the frequency channel storage area stored for the management device 100, which is the parent device, from CH0 to CH1 as the PANID storage area. Is rewritten from PID0 to PID1. In FIG. 10, the adjacent terminal 1 is the management device 100.
Further, the frequency channel storage area stored for the radio terminal 200C as a child device is rewritten from CH0 to CH1, and the PANID storage area is rewritten from PID0 to PID1. In FIG. 10, the adjacent terminal 3 is the wireless terminal 200C.
In addition, the frequency channel storage area stored for the radio terminal 200B that is equal to CH0 and PID0 originally used for the frequency channel and PANID is rewritten from CH0 to CH1, and the PANID storage area is rewritten from PID0 to PID1. In FIG. 10, the adjacent terminal 2 is the wireless terminal 200B.
On the other hand, information about the adjacent terminal 4 having a different PANID is not rewritten.

  Then, TIM_RHL is set in the reset grace time measurement unit 10 to start time measurement, and a setting change response packet is transmitted. The other operations are the same as those of radio terminal 200 according to Embodiment 1. That is, according to the setting stored in the FLASH memory 4 by the initialization process, the frequency channel set in the frequency channel setting unit 21 of the RF interface unit 5 is set to CH1, and the PANID set in the PANID setting unit 22 is set to PID1. Is done.

  As described above, when the radio terminal 200 according to this embodiment receives the frequency channel and / or PANID setting change instruction packet, in addition to its own frequency channel setting and PANID setting, the radio terminal 200 performs direct radio communication with itself. The information on the frequency channel and PANID stored in the FLASH memory 4 corresponding to the possible device is also changed to the latest state after the change. Therefore, when operating with the new settings after the change, there is no discrepancy between the stored information and the actual operation, and a highly reliable ad hoc network system can be realized.

That is, the radio terminal 200 according to this embodiment includes the radio terminal 200 according to the above embodiment,
The set value storage unit 46 further stores the set values of the frequency channel and the PANID of the other radio terminal 200,
When the frequency channel and PANID of the other radio terminal 200 stored in the setting value storage unit 46 are the same as the frequency channel and PANID before the change, the setting change unit 45 The set value is changed to a set value after change included in the change instruction information.

Embodiment 3 FIG.
In the first embodiment, the frequency channels and / or PANIDs of all the radio terminals 200 can be changed reliably when all the radio terminals 200 in the network are turned on and can operate. In this embodiment, even when one of the wireless terminals 200 in the network is turned off, the frequency channels and / or PANIDs of all the wireless terminals 200 including the wireless terminal 200 that is turned off are surely confirmed. A method that can be changed to will be described.

First, an outline will be described.
In this embodiment, first, (A) the management apparatus 100 transmits a setting change instruction packet to the wireless terminal 200 whose power is not turned off to change the setting, whereby the wireless terminal 200 whose power is not turned off The setting with the management apparatus 100 is changed. Next, (B) the setting of the wireless terminal 200 that has been turned off is changed by performing a predetermined process when the wireless terminal 200 that has been turned off is turned on.
First, in the process (A), the management apparatus 100 ignores that the setting change response packet is not transmitted from the wireless terminal 200 whose power is turned off. Thereby, the setting change instruction packet can be transmitted to all the wireless terminals 200 other than the wireless terminal 200 whose power is turned off. And the setting of all the radio | wireless terminals 200 other than the radio | wireless terminal 200, and the management apparatus 100 is changed by the process demonstrated in Embodiment 1. FIG.
Next, in the process (B), the wireless terminal 200 transmits an operation start message packet (operation start signal) to the management apparatus 100 when the power is turned on. The management apparatus 100 that has received the operation start message packet returns an operation start response packet to the wireless terminal 200. In wireless terminal 200, when the operation start response packet is not transmitted from management device 100, that is, when the operation start response packet does not reach management device 100, it is assumed that the setting has been changed while the power is turned off. Thus, the setting values of the frequency channel and the PANID are provisionally changed, and the operation start message packet is transmitted to the management apparatus 100 again. Until the operation start response packet is transmitted from the management apparatus 100, the change of the setting value and the transmission of the operation start message packet are repeated. Then, assuming that the setting value used when the operation start response packet is transmitted from the management apparatus 100 is the value currently used by the management apparatus 100 or the like, the setting value is determined to that value.

Next, it explains in detail using a figure.
FIG. 11 is a block diagram showing the configuration of the management apparatus 100 according to this embodiment.
Only the parts of the management apparatus 100 according to this embodiment that are different from the management apparatus 100 according to the first embodiment will be described.
The control unit 1 of the management apparatus 100 according to this embodiment is different in function from the control unit 1 of the management apparatus 100 according to the first embodiment. The control unit 1 of the management apparatus 100 according to this embodiment further includes a confirmation signal transmission unit 36. These functions will be described in detail in the description of the operation of the wireless terminal 200.
Further, the FLASH memory 4 of the management device 100 according to this embodiment is an example of the response ignorance permission information storage unit 37. Information stored in the FLASH memory 4 will be described later.

FIG. 12 is a block diagram showing a configuration of radio terminal 200 according to this embodiment.
Only a portion of radio terminal 200 according to this embodiment that is different from radio terminal 200 according to Embodiment 1 will be described.
The control unit 1 of the wireless terminal 200 according to this embodiment is different in function from the control unit 1 of the wireless terminal 200 according to Embodiment 1. The control unit 1 of the wireless terminal 200 according to this embodiment further includes a start signal transmission unit 47 and a confirmation signal reception unit 48. These functions will be described in detail in the description of the operation of the wireless terminal 200.

FIG. 13 is a diagram showing information stored in the FLASH memory 4 of the management apparatus 100 according to this embodiment.
The FLASH memory 4 of the management apparatus 100 of this embodiment is provided with a response ignore permission flag area for storing a response ignore permission flag (response ignore permission information).
The response ignorance permission flag indicates whether or not the setting change response packet is not transmitted. That is, by controlling the response ignorance permission flag, it is possible to control whether or not to ignore the response from the wireless terminal 200 that is powered off.
When the response ignorance permission flag area is set to the set state (response ignorable), it is permitted to perform the next operation while ignoring the reception of the setting change response packet. That is, when the response ignorance permission flag area is set to the set state, it can be ignored that there is no response from the wireless terminal 200 whose power is turned off. On the other hand, when the response ignore permission flag area is set to the reset state (response cannot be ignored), when the reception of the setting change response packet times out, it is necessary to retry transmission of the setting change instruction packet.
In the following description, it is assumed that the response ignore permission flag is set.

FIG. 14 is a diagram illustrating an example of a system configuration of an ad hoc network. In FIG. 14, in order to simplify the description, the ad hoc network includes one management apparatus 100 and a network system including the radio terminal 200A, the radio terminal 200B, and the radio terminal 200C. Further, in FIG. 14, the management device 100 and the wireless terminal 200 have the same parent-child relationship and adjacent relationship as the configuration shown in FIG. 5. Further, a response ignore permission flag area is secured in the FLASH memory 4 of the management apparatus 100 and is set to a set state (response can be ignored). Furthermore, it is assumed that the wireless terminal 200B is turned off. In addition, it is assumed that the wireless terminal 200D is an apparatus belonging to another system and is in a place where the wireless reaches the management apparatus 100 and the wireless terminal 200A.
In the configuration of FIG. 14, as in the case of the first embodiment, a network operating with the current PANID PID0 and the frequency channel CH0 is changed to operate with the PANID PID1 and the frequency channel CH1. The operation of will be described. In other words, CH0 is set in the frequency channel setting unit 21 provided in the RF interface unit 5 between the management apparatus 100 and each wireless terminal 200, and PID0 is set in the PANID setting unit 22. An operation of changing the setting of the frequency channel setting unit 21 included in the RF interface unit 5 of the management apparatus 100 and each wireless terminal 200 to CH1 and changing the setting of the PANID setting unit 22 to PID1 will be described.

Based on FIG. 15 and FIGS. 7 to 9, the process (A) will be described. FIG. 15 is a flowchart showing an operation when the management apparatus 100 according to this embodiment transmits a setting change instruction packet.
First, an operation when the management apparatus 100 transmits a setting change instruction packet and an operation when the wireless terminal 200 receives the setting change instruction packet will be described with reference to FIGS. 15 and 7. The prerequisite items are the same as those in the first embodiment. The operation when the wireless terminal 200 receives the setting change instruction packet is the same as the operation described based on FIG.

(S501) to (S507) are the same as (S101) to (S107). Further, (S509) to (S511) are the same as (S108) to (S110).
That is, the control unit 1 (change instruction transmission unit 31) of the management apparatus 100 initializes the entry read pointer of the device address table (S501), and sets 3 in the set terminal count unit 13 (S502). Thereafter, the control unit 1 (change instruction transmission unit 31) reads the address of the destination (S503), creates a setting change instruction packet (S504), and transmits it to the radio terminal 200A (S505). After transmitting the setting change instruction packet, it is confirmed whether a setting change response packet has been received (S506) and whether a predetermined time has passed (S507). When the setting change response packet is received (Yes in S506), the setting terminal count unit 13 counts down the setting terminal count by 1 (S509), and the control unit 1 (change instruction transmission unit 31) has the setting terminal count of 0? It is confirmed whether or not (S510). If the set terminal count is not 0 (No in S510), the entry read pointer is incremented by 1 (S511), the process returns to (S503), and a setting change instruction packet is transmitted to the next wireless terminal 200.

Here, it is assumed that the wireless terminal 200A is turned on and has received the setting change response packet within the predetermined time measured in (S507) (Yes in S506).
That is, the radio terminal 200A receives the setting change instruction packet, checks the setting change instruction packet (S201), and temporarily stores the setting value (S202). Then, the radio terminal 200A creates and transmits a setting change response packet (S203, S204). That is, the wireless terminal 200A that has received the setting change instruction packet addressed to itself stores the changed frequency channel CH1 and the changed PANID value PID1 in the FLASH memory 4, and the reset grace time measuring unit 10 sets TIM_RHL. After the time measurement is started, a setting change response packet is transmitted.

After the set terminal count section 13 counts down the set terminal count by 1 (S509), the management apparatus 100 returns to (S503), creates a setting change instruction packet for the next wireless terminal 200B (S504), and transmits it. (S505).
Here, the wireless terminal 200B is powered off. For this reason, the setting change response packet is not received even if the response reception timeout period elapses (No in S507).
Therefore, in (S508), the control unit 1 (change instruction transmission unit 31) checks the setting of the response ignore permission flag stored in the FLASH memory 4. If the response ignore permission flag is set (Yes in S508), it is ignored that the setting change response packet has not been received, and the process proceeds to (S509). On the other hand, when the response ignorance permission flag is in the reset state (No in S508), the process returns to S505 to retransmit the setting change packet.
Here, since the response ignore permission flag is set (Yes in S508), the setting change response packet is not received, but the process proceeds to (S509).

Then, after the set terminal count section 13 counts down the set terminal count by 1 (S509), the process returns to (S503), creates a setting change instruction packet to the next wireless terminal 200C (S504), and transmits it (S505). ).
Here, it is assumed that the wireless terminal 200C is turned on and has received the setting change response packet within the predetermined time measured in (S507) (Yes in S506).
That is, the wireless terminal 200C receives the setting change instruction packet, checks the setting change instruction packet (S201), and temporarily stores the setting value (S202). Then, the radio terminal 200C creates and transmits a setting change response packet (S203, S204). That is, in the wireless terminal 200C that has received the setting change instruction packet addressed to itself, the FLASH memory 4 stores the changed frequency channel CH1 and the changed PANID value PID1, and the reset grace time measuring unit 10 sets TIM_RHL. After the time measurement is started, a setting change response packet is transmitted.

In the management apparatus 100 that has received the setting change response packet from the wireless terminal 200C, the setting terminal count section 13 counts down the setting terminal count by one. As a result, the set terminal number counting unit 13 becomes 0 (Yes in S510), and the transmission process of the setting change instruction packet is ended. Then, the management apparatus 100 transmits a reset setting instruction packet.
Next, an operation when the management apparatus 100 transmits a reset instruction packet and an operation when the wireless terminal 200 receives the reset instruction packet will be described with reference to FIGS. The operation when the management apparatus 100 transmits the reset instruction packet is the same as the operation described based on FIG. The operation when the wireless terminal 200 receives the reset instruction packet is the same as the operation described based on FIG.

That is, in the management apparatus 100, the control unit 1 (reset instruction transmission unit 33) creates a reset instruction packet (S301) and broadcasts the reset instruction packet (S302). After transmitting the reset instruction packet, the reset window time measurement unit 10 sets the reset window time (TIM_MIN) and starts measuring the reset window time (S303). When the reset grace time elapses, the control unit 1 (setting change unit 34) changes the set value (S304).
On the other hand, the wireless terminal 200 that has received the reset instruction packet (in this case, the wireless terminal 200A and the wireless terminal 200C other than the wireless terminal 200B that is not turned on) receives the reset instruction packet (S401), and each wireless terminal The reset delay time indicated by the packet is set in the reset delay time measuring means addressed to 200, and measurement is started (S402). When the reset grace time elapses, reset processing is executed by a device other than the wireless terminal 200B, and the setting value is changed (S403). Thereafter, the network operation is started with the changed frequency channel (CH1) and the changed PANID (PID1).
In other words, the settings of the wireless terminal 200 and the management apparatus 100 that are not turned off are reliably changed by the above processing.

Next, the process (B) will be described with reference to FIG. FIG. 16 is a flowchart showing the operation of the initialization process of radio terminal 200 according to this embodiment according to this embodiment. That is, the process (B) is performed in the reset process.
Therefore, the process (B) is a process for changing the setting of the wireless terminal 200 that has been turned off (here, the wireless terminal 200B). In addition to the wireless terminal 200B), the wireless terminal 200 (in this case, the wireless terminal 200A and the wireless terminal 200C) that has not been powered off is also executed.

  From (S601) to (S604), the control unit 1 executes an initialization process. In the initialization process, the CH1 stored in the frequency channel storage area of the FLASH memory 4, the PID1 stored in the PANID storage area, and the own network address stored in the self address storage area are read out temporarily. To the RF interface unit 5.

In (S605), the control unit 1 (start signal transmission unit 47) creates an operation start message packet.
The operation start message packet includes a header part and a data part. The header part of the operation start message packet is the same as the header part of the setting change response packet. The data portion of the operation start message packet includes a command code field.
The information set in the header part is the same as in the above embodiment. An operation start message command is set in the command code field of the data portion.

In (S606), the control unit 1 (start signal transmission unit 47) sets the number of transmission retries to an arbitrary N times and stores it in the FLASH memory 4 and the RAM 3.
In (S607), the control unit 1 (start signal transmission unit 47) transmits an operation start message packet to the management apparatus 100.

In (S608), the control unit 1 (confirmation signal receiving unit 48) confirms whether or not an operation start response packet (operation confirmation signal) has been received.
When receiving the operation start message packet, the control unit 1 (confirmation signal transmission unit 36) of the management apparatus 100 transmits an operation start response packet to the wireless terminal 200 that is the transmission source of the operation start message packet. That is, when the control unit 1 (response receiving unit 32) receives the operation start response packet, it can be confirmed that the wireless terminal 200 has received the setting change instruction packet.
When the operation start response packet is received (Yes in S608), the process proceeds to (S609). On the other hand, when the operation start response packet has not been received (No in S608), the process proceeds to (S610).

  In (S609), since it has been confirmed that communication with the management apparatus 100 can be performed using the setting value read from the FLASH memory 4, the control unit 1 (setting changing unit 45) provisionally sends the setting value to the RF interface unit 5. Confirm to the set value. Further, the control unit 1 (setting change unit 45) stores the determined value in the FLASH memory 4.

In (S610), the control unit 1 (confirmation signal receiving unit 48) confirms whether or not a predetermined time has elapsed since the operation start message packet was transmitted. When the predetermined time has elapsed, the control unit 1 (confirmation signal receiving unit 48) determines that a timeout has occurred, and regards that the operation start message packet has not reached the management apparatus 100.
If the predetermined time has elapsed (Yes in S610), the process proceeds to (S611). On the other hand, if the predetermined time has not elapsed (No in S610), the process returns to (S608), and it is confirmed whether a setting change response packet has been received again.

Here, the wireless terminal 200A and the wireless terminal 200C except the wireless terminal 200B are in a state in which the setting value is correctly changed and communication with the management apparatus 100 is possible. Therefore, when the wireless terminal 200A and the wireless terminal 200C transmit an operation start message packet to the management apparatus 100 when the operation is reset and the operation is started again, an operation start response packet is returned from the management apparatus 100. As a result, the wireless terminal 200A and the wireless terminal 200C receive the returned operation start response packet (Yes in S608). Then, the wireless terminal 200A and the wireless terminal 200C determine the set value and start a normal communication operation (S609). In this way, it is confirmed that the management apparatus 100 and all the wireless terminals 200 that have been powered on have completed the frequency channel and PANID setting change and can perform normal communication operations.
On the other hand, the radio terminal 200B does not know that the frequency channel and the PANID have been changed in the management apparatus 100 or another radio terminal 200. Therefore, when the power is turned on, initialization is executed with the settings before the change (frequency channel is CH0, PANID is PID0). Then, an operation start message packet is transmitted to the management apparatus 100 with the settings before the change. However, since the frequency channel and PANID settings are different, the operation start message packet does not reach the management apparatus 100. Therefore, even if the predetermined time has elapsed, the operation start response is not received (No in S608, Yes in S610). Therefore, the radio terminal 200B performs the process described below to determine the set value.

In (S611), the control unit 1 (start signal transmission unit 47) decrements the number of transmission retries by -1.
In (S612), the control unit 1 (start signal transmission unit 47) determines whether or not the number of transmission retries has become zero. If the number of transmission retries is 0 (Yes in S612), the process proceeds to (S613). On the other hand, if the number of transmission retries is not 0 (No in S612), the process returns to (S607) to retransmit the operation start message packet.
That is, the control unit 1 (start signal transmission unit 47) of the radio terminal 200B executes transmission retry of the operation start message packet. However, since the set values are different, the operation start message does not reach the management apparatus 100 and the operation start response is not received regardless of the number of transmission retries (No in S608). The control unit 1 (start signal transmission unit 47) of the wireless terminal 200B fails to retry N times (Yes in S612).

In (S613) and (S614), control unit 1 (start signal transmission unit 47) advances the set value of the frequency channel by one channel. That is, the control unit 1 (start signal transmission unit 47) selects the next set value from the predetermined frequency channels to be used. Next, when there is no set value (Yes in S614), the process proceeds to (S615). On the other hand, when there is a value set next (No in S615), the process returns to (S604), the selected frequency channel is set in the frequency channel setting unit 21 of the RF interface unit 5, and an operation start message packet is set. Send.
That is, the control unit 1 (start signal transmission unit 47) of the wireless terminal 200B changes the frequency channel by one channel (S613, S614, S604), changes to CH1, and transmits an operation start message packet to the management apparatus 100. (S605-S612). However, since the PANID is different, the management apparatus 100 discards the operation start message even if it receives the operation start message. The wireless terminal 200B does not return an operation start response packet within a predetermined time (S608, S610), and therefore transmits a retry operation start message. If the retry transmission fails N times (Yes in S612), the frequency channel is further changed by one channel (S613, S614, S604), and the retry transmission of the operation start message is continued (S605-S612). Then, all N times of retry transmissions fail in all frequency channels.

In (S615), when there is no value set next, that is, when N times of retry transmissions fail in all frequency channels (Yes in S614), the control unit 1 (start signal transmission unit 47) If the frequency channel fails, the frequency channel is changed to the minimum frequency channel.
In (S616) and (S617), control unit 1 (start signal transmission unit 47) advances the set value of PANID to the next candidate. That is, the control unit 1 (start signal transmission unit 47) selects the next set value from the predetermined PANID scheduled to be used. Next, when there is no set value (Yes in S617), the process proceeds to (S618). On the other hand, if there is a value set next (No in S617), the process returns to (S604), sets the selected PANID in the PANID setting unit 22 of the RF interface unit 5, and transmits an operation start message packet. .
That is, the control unit 1 (start signal transmission unit 47) of the wireless terminal 200B changes the frequency channel to the minimum frequency channel (S615) and changes the PANID to the next PANID candidate (S616, S617, S604). The operation start message packet is transmitted (S605-S612). That is, PID0 is changed to PID1. The frequency channel uses CH0 to transmit an operation start message packet. However, since the frequency channel is different, the packet does not reach the management apparatus 100, and the wireless terminal 200B does not receive the operation start response within a certain time (S608, S610). Times failed (Yes in S612).

  Then, the frequency channel is advanced by one channel from CH0 to CH1 (S613), and the operation start message is transmitted with PANID being PID1 (S605-S612). Then, the management apparatus 100 receives the operation start message and transmits an operation start response to the wireless terminal 200B that is the transmission source. As a result, the control unit 1 (confirmation signal receiving unit 48) receives the operation start response (Yes in S608), and sets the frequency channel (CH1) and PANID (PID1) at that time for the FLASH memory 4 itself. Store in the frequency channel storage area and the PANID storage area.

According to the above processing, the wireless terminal 200 can finally find the changed setting value regardless of the changed setting value.
That is, by the above processing, the setting of the wireless terminal 200B that has been turned off is also changed. As a result, the settings of all the wireless terminals 200 and the management device 100 are surely changed.

  As described above, according to the management apparatus 100 and the wireless terminal 200 according to this embodiment, even if any wireless terminal 200 in the network is in a power-off state, all the wireless terminals 200 The setting change of the frequency channel and the PANID can be surely executed. Also, the wireless terminal 200 that has been turned off can be changed to a frequency channel and a PANID when the power is turned on. Therefore, the frequency channel and the PANID can be changed more flexibly and surely, and the reliability of the ad hoc network system can be improved.

  In (S609), similarly to the second embodiment, the control unit 1 (confirmation signal reception unit 48) sets the set values of the parent node, child node, frequency channel, and PANID before the change (that is, the frequency) The channel may be set in the frequency channel storage area and the PANID storage area for all adjacent nodes whose channel is CH0 and PANID is PID0.

That is, in addition to the management apparatus 100 according to the above embodiment, the management apparatus 100 according to this embodiment further includes
A response ignore permission information storage unit 37 for storing response ignore permission information for each wireless terminal 200;
The reset instruction transmitting unit 33 is a wireless terminal in which the response ignorance permission information stored in the response ignorance permission information storage unit 37 is stored even when the response receiving unit 32 does not receive a response signal from the wireless terminal 200. When 200 indicates that no response signal is negligible, reset instruction information is transmitted.

Further, the change instruction transmission unit 31 of the management apparatus 100 does not receive the response signal from the wireless terminal 200 that is the transmission destination of the change instruction information, even if the response reception unit 32 does not receive the response ignore permission information storage unit 37. Is transmitted, the change instruction information is transmitted to the next radio terminal 200 when the response ignore permission information stored therein indicates that there is no response signal from the destination radio terminal 200. .

In addition to the wireless terminal 200 according to the above embodiment, the wireless terminal 200 according to this embodiment further includes:
A start signal transmission unit 47 that transmits an operation start signal to the management apparatus 100 when the power is turned on;
A confirmation signal receiving unit 48 for receiving an operation confirmation signal transmitted from the management device 100 when the management device 100 receives the operation start signal transmitted by the start signal transmission unit 47;
If the confirmation signal receiving unit 48 does not receive the operation confirmation signal even after a predetermined time has elapsed after transmitting the operation start signal, the start signal transmission unit 47 determines whether the frequency channel being used and the PANID are used. Change at least one, and send an operation start signal to the management apparatus 100 again,
The setting changing unit 45 is characterized in that the setting value is changed to the frequency channel and PANID used when the confirmation signal receiving unit 48 receives the operation confirmation signal.

Embodiment 4 FIG.
In the third embodiment, it can be ignored that no setting change response packet is transmitted regardless of the importance of the radio terminal 200. In this embodiment, a method for specifying whether or not it is possible to ignore the absence of transmission of a setting change response packet for each wireless terminal 200 will be described.

  FIG. 17 is a diagram showing information stored in the FLASH memory 4 of the management apparatus 100 according to this embodiment. The FLASH memory 4 is provided with a response ignorance permission flag area similar to that of the third embodiment, and a response ignorance permission flag area is provided in information held corresponding to each wireless terminal 200. That is, the management apparatus 100 according to this embodiment can store a response ignore permission flag for each wireless terminal 200.

FIG. 18 is a flowchart showing an operation when the management apparatus 100 according to this embodiment transmits a setting change instruction packet.
(S701) to (S708) are the same as (S501) to (S508). Further, (S710) to (S712) are the same as (S509) to (S511).
In (S709), if the ad hoc network system can ignore the absence of the transmission of the setting change response packet (Yes in S708), the response ignorance permission stored for the wireless terminal 200 that is the transmission destination of the setting change instruction packet is permitted. It is confirmed whether or not the flag indicates that it can be ignored that no setting change response packet is transmitted.
When the response ignorance permission flag indicates that the setting change response packet is not transmitted from the destination wireless terminal 200 (Yes in S709), the process proceeds to (S710). On the other hand, when the response ignorance permission flag indicates that transmission of the destination wireless terminal 200 setting change response packet cannot be ignored (No in S709), the process returns to (S705) to retransmit the setting change instruction packet.

  As described above, according to the management device 100 and the wireless terminal 200 according to this embodiment, only the wireless terminal 200 that may be operated to be turned off in the system can ignore the response to the setting change instruction. It is possible to set to do. Therefore, the frequency channel and the PANID can be changed more reliably, and the reliability of the ad hoc network system can be improved.

  When the setting change instruction packet is broadcasted, the management apparatus 100 resets the setting instruction if the setting change response packet is not sent only from the wireless terminal 200 in which the response ignore permission flag is set. Packets can be sent.

Embodiment 5 FIG.
In the third and fourth embodiments, the method of changing the setting of the wireless terminal 200 that has not been changed because the power is turned off has been described. In this embodiment, a method of changing the setting of the wireless terminal 200 that has not been changed even though the power is not turned off will be described.

As described in the above embodiment, when it is necessary to change the frequency channel and / or PANID, the management device 100 transmits a setting change instruction packet to each wireless terminal 200 to change the frequency channel after the change. And PANID is instructed to the wireless terminal 200A.
Here, for example, it is assumed that a setting change instruction packet is transmitted to radio terminal 200 (in this case, radio terminal 200A) in which the corresponding response ignore permission flag in the fourth embodiment is set. At this time, although the power of the wireless terminal 200A is not cut off, the wireless terminal 200 as the transmission destination may fail to receive the setting change instruction packet due to competition with other wireless devices. In this case, since the response ignorance permission flag is set even if the management apparatus 100 does not return the setting change response packet from the wireless terminal 200A, the setting change instruction to the next wireless terminal 200 (for example, the wireless terminal 200B) is set. Send. Thereafter, when the radio terminal 200A fails to receive the broadcast of the reset instruction packet, the radio terminal 200A is in a state where the frequency channel and / or the PANID is not changed. As a result, the wireless terminal 200A is in a state where wireless communication with the management apparatus 100 or the like is not possible. Since the power is not cut off, the initialization process is not performed. Therefore, the state in which the wireless terminal 200A cannot wirelessly communicate with the management device 100 or the like continues.
In this embodiment, a method for changing the setting of the wireless terminal 200 that has not been changed even though the power is not turned off will be described.

FIG. 19 is a block diagram showing the configuration of the management apparatus 100 according to this embodiment.
The management apparatus 100 according to this embodiment includes a communication stop monitoring instruction transmission unit 38 in addition to the management apparatus 100 according to the third embodiment.
The communication stop monitoring instruction transmission unit 38 transmits a communication stop monitoring instruction packet (communication stop monitoring signal) to each wireless terminal 200 every predetermined period.
The communication stop monitoring instruction packet includes a header part and a data part. The header part of the communication stop monitoring instruction packet is the same as the header part of the setting change instruction packet. The data portion of the communication stop monitoring instruction packet includes a command code field and a communication stop monitoring postponement time field.
The information set in the header part is the same as in the above embodiment. In addition, a communication stop monitoring instruction command is set in the command code field of the data portion. Further, a predetermined time is set in the communication stop monitoring grace time field. Communication stop monitoring instruction packets are transmitted to the wireless terminal 200 at intervals shorter than a predetermined time set in the communication stop monitoring grace time field.

FIG. 20 is a block diagram showing a configuration of radio terminal 200 according to this embodiment.
The radio terminal 200 according to this embodiment includes a communication stop measurement unit 49 in addition to the radio terminal 200 according to the third embodiment.
The communication stop measurement unit 49 can set the measurement time, and generates the reset signal 15 when the set time has elapsed.

Next, the operation will be described.
During normal operation, the control unit 1 (communication stop monitoring instruction transmission unit 38) of the management apparatus 100 transmits a communication stop monitoring instruction packet to each wireless terminal 200 at predetermined intervals. The communication stop measurement unit 49 of the wireless terminal 200 that has received the communication stop monitoring instruction packet sets the monitoring time set in the communication stop monitoring postponement time field, and starts time measurement. Since the communication stop monitoring instruction packet is transmitted to the wireless terminal 200 every predetermined period, the monitoring time set by the communication stop measuring unit 49 is also updated every predetermined period. Therefore, as long as the wireless terminal 200 and the management device 100 can communicate with each other, the time set in the communication stop measurement unit 49 does not pass in principle.
However, for some reason, when the wireless terminal 200 and the management apparatus 100 cannot communicate with each other and the time set in the communication stop measurement unit 49 elapses, the communication stop measurement unit 49 generates the reset signal 15. And the control part 1 of 200 A of radio | wireless terminals is reset, and an initialization process is performed. In the initialization process, the frequency channel and PANID are changed as in the process described in Embodiment 3 with reference to FIG. 16, and finally, the radio terminal 200 sets the changed frequency channel and PANID. Is done.
That is, in the above example, the communication stop measurement unit 49 of the wireless terminal 200A also sets the monitoring time and starts the time measurement for each predetermined period while it can communicate with the management apparatus 100. When communication between the radio terminal 200A and the management apparatus 100 is interrupted, the control unit 1 of the radio terminal 200A is reset and an initialization process is performed. As a result, the setting of the radio terminal 200A is changed, and the radio terminal 200A can communicate with the management apparatus 100 again.

  As described above, according to the management device 100 and the wireless terminal 200 according to this embodiment, even in an environment where wireless communication cannot be temporarily performed due to competition with other wireless devices, the network can be reliably connected. It is possible to change the frequency channel and PANID of all the wireless terminals 200 in the network.

  The communication stop measurement unit 49 may be provided in the control unit 1.

That is, the radio terminal 200 according to this embodiment includes, in addition to the radio terminal 200 according to the above embodiment,
A communication stop measuring unit 49 for measuring a time during which communication with the management apparatus 100 is not performed;
The start signal transmission unit 47 transmits an operation start signal to the management apparatus 100 when the time measured by the communication stop measurement unit 49 becomes a predetermined time or more.

The above description is summarized as follows.
In a wireless ad hoc network system capable of using a plurality of radio frequency channels and a PANID for identifying a network in which the user has entered, and capable of multi-hop communication,
Nonvolatile storage means for storing radio frequency channels and PANIDs in all wireless terminals 200 in the network, and reset grace time measuring means from when a setting change instruction or reset instruction is received until reset is actually executed And a radio frequency channel taken out from the non-volatile storage means in an initialization operation started by a reset that is output when the time set in the reset grace time measuring means has elapsed or a power-on reset at power-on, and It is necessary to change the radio frequency channel or PANID used in the network by starting the wireless operation with the PANID and providing the management device 100 that knows the network addresses of all the terminals in the network with the set terminal count unit 13. Is displayed, the management apparatus 100 After setting the number counting unit 13 to the number of radio terminals 200 in the network, the radio frequency channel and PANID that were originally used are used for each radio terminal 200, and the desired radio frequency channel and PANID are sufficient. A setting change instruction designating a long reset grace time is transmitted by unicast or broadcast, and in the case of unicast, when the normal response is returned from the radio terminal 200, the set terminal count counter 13 is decremented by 1 and the next radio When the setting change instruction to the terminal 200 is unicast, and the normal response is returned from the wireless terminal 200 in the case of broadcast, the setting terminal number counting unit 13 is decremented by 1, and the setting terminal number counting unit 13 becomes zero. Send a reset instruction with a minimum reset grace time, A radio frequency change method and wireless device being characterized in that to be able to reliably change the radio frequency channel and PANID of all the wireless terminals 200 in Ttowaku.

  In addition, when each wireless terminal 200 receives the setting change instruction, in addition to the wireless frequency channel and PANID stored in the nonvolatile storage device corresponding to itself, the wireless terminal 200 has the same parent terminal, child terminal, and PANID. The radio frequency channel and PANID information stored corresponding to the radio frequency is also rewritten to the specified value, so that the radio frequency held by all terminals in the system even after the PANID and radio frequency channel are changed by reset execution. A radio frequency change method and a radio apparatus characterized in that no contradiction occurs in channel and PANID information.

  Further, the wireless terminal 200 is configured to transmit an operation start message to the management apparatus 100 after completion of initialization by power-on and reset, and the management apparatus 100 transmits the operation start message to the wireless terminal 200 that has received the operation start message. When the operation start response is transmitted and the operation start response to the operation start message transmission is not returned for a certain time, the radio terminal 200 first changes the radio frequency channel until the operation start response is returned. In the unlikely event that an operation start response is not returned in all radio frequency channels, the PANID is changed and an operation start message is transmitted. Finally, the radio frequency channel and PANID of the management apparatus 100 are All possible radio frequency channels and PANIs until the setting is the same When the response ignorance permission flag is set to the reset state by providing the response ignorance permission flag in the management apparatus 100, a response to the transmitted setting change instruction is transmitted. Is not returned within a predetermined time, a setting change instruction to the wireless terminal 200 is retried until a normal response is returned, and in the case of broadcast transmission, the set terminal count unit 13 does not become zero within a predetermined time. If the setting change instruction broadcast is retried and the response ignore permission flag is set to the set state, even if there is a wireless terminal 200 that does not return a response to the transmitted setting change instruction, Sends a setting change instruction to the next terminal. It was to start transmitting a radio frequency change method and a radio apparatus according to claim.

  Further, the management apparatus 100 is provided with a response ignorance permission flag corresponding to each wireless terminal 200, whereby the necessity of a normal response to the setting change instruction can be set for each wireless terminal 200. A frequency change method and a wireless device.

  Further, each wireless terminal 200 is provided with a communication stop measuring means, and the management apparatus 100 transmits a communication stop monitoring instruction specifying a communication stop detection grace time to each wireless terminal 200 and receives the communication stop monitoring instruction. The terminal 200 sets the designated communication suspension grace time in the communication suspension measurement means to start the time measurement operation, and thereafter, the time set as the communication suspension grace time every time any communication is received from the monitoring device. Is set again in the communication stop measurement means to start the time measurement operation, so that if the reception from the monitoring device is performed beyond the communication stop grace time, the reset is executed. Thus, in the normal sequence, the radio frequency channel and PANID of the radio terminal 200 that failed to change the radio frequency channel or PANID can also be changed. A radio frequency change method and a radio apparatus to so that.

In the above description, what is expressed as “to part” may be “to circuit”, “to device”, “to device”, “to means”, and “to function”. It may be read as “step”, “˜procedure”, “˜processing”. That is, what is described as “˜unit” may be realized by firmware stored in the ROM 2 or the like. Alternatively, it may be realized only by software, or only by hardware such as an element, a device, a board, and wiring, or by a combination of software and hardware, and further by a combination of firmware. Firmware and software are stored in the storage device as programs. The program is read by the processing device and executed by the processing device. In other words, the program causes a computer or the like to function as “to part” described below. Alternatively, the procedure or method of “to part” described below is executed by a computer or the like.
That is, the change instruction transmission unit 31, the response reception unit 32, the reset instruction transmission unit 33, the setting change unit 34, the check unit 41, the change instruction information reception unit 42, the response signal transmission unit 43, and the reset instruction information reception that the control unit 1 includes. The unit 44, the setting change unit 45, the start signal transmission unit 47, the confirmation signal reception unit 48, and the communication stop measurement unit 49 provided separately from the control unit 1 may be independent circuits or the like. Software or a program executed by a circuit such as a CPU or DSP may be used.
In the above description, the setting value storage unit 35, the response ignorance permission information storage unit 37, and the setting value storage unit 46 are software executed by a circuit such as a CPU or DSP, even if they are independent storage devices. It may be a program.
The wireless reception unit 6, the wireless transmission unit 7, and the common unit 8 may be independent circuits or the like, or may be software and programs executed by circuits such as a CPU and a DSP.
Further, the reset grace time measuring unit 10 and the set terminal number counting unit 13 may be independent circuits or the like, or may be software and programs executed by circuits such as a CPU and a DSP.

1 is a block diagram showing a configuration of a management device 100 according to Embodiment 1. FIG. FIG. 2 is a block diagram showing a configuration of radio terminal 200 according to Embodiment 1. The figure which shows the data format of a setting change instruction packet and a setting change response packet. The figure which shows the data format of a reset instruction | indication packet and a reset response packet. 1 is a diagram illustrating an example of a system configuration of an ad hoc network according to Embodiment 1. FIG. 6 is a flowchart showing an operation when the management apparatus 100 according to the first embodiment transmits a setting change instruction packet. 6 is a flowchart showing an operation when the radio terminal 200 according to Embodiment 1 receives a setting change instruction packet. 6 is a flowchart illustrating an operation when the management apparatus 100 according to the first embodiment transmits a reset instruction packet. 4 is a flowchart showing an operation when the radio terminal 200 according to Embodiment 1 receives a reset instruction packet. FIG. 6 is a diagram showing information stored in the FLASH memory 4 before and after the wireless terminal 200A receives the setting change instruction packet in the network configuration shown in FIG. 5 in the second embodiment. FIG. 9 is a block diagram illustrating a configuration of a management apparatus 100 according to a third embodiment. FIG. 4 is a block diagram showing a configuration of a wireless terminal 200 according to Embodiment 3. It is a figure which shows the information which the FLASH memory 4 of the management apparatus 100 which concerns on Embodiment 3 memorize | stored. FIG. 4 is a diagram illustrating an example of a system configuration of an ad hoc network according to a third embodiment. 10 is a flowchart showing an operation when the management apparatus 100 according to the third embodiment transmits a setting change instruction packet. 10 is a flowchart showing an operation of reset processing of the radio terminal 200 according to Embodiment 3. The figure which shows the information which the FLASH memory 4 of the management apparatus 100 which concerns on Embodiment 4 memorize | stored. 14 is a flowchart illustrating an operation when the management apparatus 100 according to the fourth embodiment transmits a setting change instruction packet. FIG. 6 is a block diagram showing a configuration of a management apparatus 100 according to a fifth embodiment. FIG. 6 is a block diagram showing a configuration of a wireless terminal 200 according to Embodiment 5.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Control part, 2 ROM, 3 RAM, 4 FLASH memory, 5 RF interface part, 6 Wireless reception part, 7 Wireless transmission part, 8 Common part, 9 Antenna, 10 Reset grace time measurement part, 11 Power-on reset circuit, 12 AND gate, 13 set terminal count section, 14 bus, 15 reset signal, 16 power-on reset signal, 17 count signal, 21 frequency channel setting section, 22 PANID setting section, 23 address setting section, 31 change instruction transmitting section, 32 Response reception unit, 33 Reset instruction transmission unit, 34 Setting change unit, 35 Set value storage unit, 36 Confirmation signal transmission unit, 37 Response ignore permission information storage unit, 38 Communication stop monitoring instruction transmission unit, 41 Check unit, 42 Change instruction Information receiving unit, 43 response signal transmitting unit, 44 reset instruction information receiving unit, 45 setting change unit, 46 setting value storage unit, 47 start signal transmission unit, 48 confirmation signal reception unit, 49 communication stop measurement unit, 100 management device, 200 wireless terminal.

Claims (13)

A management device that manages information of a plurality of wireless terminals connected to an ad hoc network,
When changing the setting value of at least one of a frequency channel and a PANID (Personal Area Network IDentifier) used by the plurality of wireless terminals for communication, change instruction information including the changed setting value is transmitted to the plurality of wireless terminals. A change instruction transmission unit to be transmitted to,
A response receiving unit that receives a response signal transmitted from each wireless terminal when each wireless terminal of the plurality of wireless terminals receives the change instruction information transmitted by the change instruction transmitting unit;
Reset instruction for transmitting, to the plurality of wireless terminals, reset instruction information for changing the setting to the changed setting value included in the change instruction information when the response receiving unit receives a response signal from each of the wireless terminals. A management apparatus comprising: a transmission unit. The management device further includes:
A response ignorance permission information storage unit that stores response ignorance permission information indicating whether or not there is no response signal for each wireless terminal;
Even when the response receiving unit does not receive a response signal from a certain wireless terminal, the reset instruction transmitting unit receives the response ignorance permission information stored in the response ignorance permission information storage unit from the certain wireless terminal. The management apparatus according to claim 1, wherein reset instruction information is transmitted in a case where it is possible to ignore the absence. Whether the change instruction transmitting unit unicasts the change instruction information to each of the wireless terminals in a predetermined order, and whether the response receiving unit has received a response signal transmitted from the wireless terminal that is the destination of the change instruction information. 3. The management apparatus according to claim 1, wherein the management apparatus transmits the change instruction information to a next wireless terminal when the response reception unit receives the response signal. The change instruction transmission unit transmits the response ignore permission information stored in the response ignore permission information storage unit even when the response receiver does not receive a response signal from the wireless terminal to which the change instruction information is transmitted. 4. The management apparatus according to claim 3, wherein when the absence of a response signal from the previous wireless terminal indicates that it can be ignored, the change instruction information is transmitted to the next wireless terminal. A wireless terminal connected to an ad hoc network and managed by a management device.
A setting value storage unit that stores setting values of at least one of a frequency channel being used and a PANID (Personal Area Network IDentifier);
A change instruction information receiving unit that receives change instruction information including a setting value after changing at least one of the frequency channel and the PANID from the management device;
A reset instruction information receiving unit for receiving reset instruction information for prompting a change in a set value from the management device;
When the reset instruction information receiving unit receives the reset instruction information, the setting value stored in the setting value storage unit is changed to a changed setting value included in the change instruction information received by the change instruction information receiving unit. A wireless terminal comprising: a setting change unit. The set value storage unit further stores the set values of the frequency channels and PANIDs of other wireless terminals in the storage device,
The setting change unit, when both the frequency channel and PANID of the other wireless terminal stored in the setting value storage unit are the same as the frequency channel and PANID before the change, sets the setting value of the other wireless terminal. The wireless terminal according to claim 5, wherein the wireless terminal is changed to a changed set value included in the change instruction information. The wireless terminal further includes:
A start signal transmitter for transmitting an operation start signal to the management device when the power is turned on;
A confirmation signal receiving unit that receives an operation confirmation signal transmitted from the management device when the management device receives the operation start signal transmitted by the start signal transmission unit;
If the confirmation signal receiving unit does not receive the operation confirmation signal even after a predetermined time has elapsed after transmitting the operation start signal, the start signal transmission unit is at least one of the frequency channel and the PANID being used. Change this, and again send an operation start signal to the management device,
The wireless terminal according to claim 5 or 6, wherein the setting changing unit changes a setting value to a frequency channel and a PANID used when the confirmation signal receiving unit receives the operation confirmation signal. . The wireless terminal further includes:
Comprising a communication stop measuring unit for measuring the time not communicating with the management device,
8. The wireless terminal according to claim 7, wherein the start signal transmission unit transmits an operation start signal to the management device when the time measured by the communication stop time measurement unit is equal to or longer than a predetermined time. . An ad hoc network system in which a plurality of wireless terminals and a management device that manages information of the plurality of wireless terminals are connected;
The management device
When changing the setting value of at least one of a frequency channel and a PANID (Personal Area Network IDentifier) used by the plurality of wireless terminals for communication, change instruction information including the changed setting value is transmitted to the plurality of wireless terminals. A change instruction transmission unit to be transmitted to,
A response receiving unit that receives a response signal transmitted from each wireless terminal when each wireless terminal of the plurality of wireless terminals receives the change instruction information transmitted by the change instruction transmitting unit;
Reset instruction for transmitting, to the plurality of wireless terminals, reset instruction information for changing the setting to the changed setting value included in the change instruction information when the response receiving unit receives a response signal from each of the wireless terminals. A transmission unit,
Each wireless terminal of the plurality of wireless terminals is
A setting value storage unit that stores setting values of at least one of the frequency channel being used and the PANID;
A change instruction information receiving unit for receiving the change instruction information transmitted by the change instruction transmitting unit;
A response signal transmitting unit that transmits a response signal to the management device when the change instruction information receiving unit receives the change instruction information;
A reset instruction information receiving unit for receiving the reset instruction information transmitted by the reset instruction transmitting unit;
A setting change unit that changes the setting value stored in the setting value storage unit to the changed setting value included in the change instruction information when the reset instruction information receiving unit receives the reset instruction information. A featured ad hoc network system. A management device setting change program for managing information of a plurality of wireless terminals connected to an ad hoc network,
When changing the setting value of at least one of a frequency channel and a PANID (Personal Area Network IDentifier) used by the plurality of wireless terminals for communication, change instruction information including the changed setting value is transmitted to the plurality of wireless terminals. Change instruction transmission processing to be transmitted to
A response reception process for receiving a response signal transmitted from each wireless terminal when each wireless terminal of the plurality of wireless terminals receives the change instruction information transmitted in the change instruction transmission process;
A reset instruction for transmitting reset instruction information to the plurality of wireless terminals to change the setting to the setting value after change included in the change instruction information when a response signal is received from each wireless terminal in the response reception process A management apparatus setting change program that causes a computer to execute transmission processing. A method for changing a setting of a management device that manages information of a plurality of wireless terminals connected to an ad hoc network,
When the communication device changes the setting value of at least one of the frequency channel and PANID (Personal Area Network IDentifier) used by the plurality of wireless terminals for communication, the change instruction information including the changed setting value A change instruction transmission step for transmitting to a plurality of wireless terminals;
A response reception step of receiving a response signal transmitted from each of the wireless terminals when each wireless terminal of the plurality of wireless terminals receives the change instruction information transmitted by the communication device in the change instruction transmitting step;
When the communication device receives a response signal from each of the wireless terminals in the response receiving step, reset instruction information for changing the setting to the changed setting value included in the change instruction information is sent to the plurality of wireless terminals. A management apparatus setting change method comprising: a reset instruction transmission step for transmitting. A wireless terminal setting change program connected to an ad hoc network and managed by a management device.
Change instruction information reception processing for receiving change instruction information including a setting value after changing at least one of a frequency channel and a PANID (Personal Area Network IDentifier);
Reset instruction information reception processing for receiving reset instruction information for urging change of a setting value from the management device;
When the reset instruction information is received in the reset instruction information receiving process, the change instruction information received in the change instruction information receiving process includes at least one of the setting values of the frequency channel and the PANID stored in the storage device in advance. A setting change program for a wireless terminal, which causes a computer to execute a setting change process for changing to a set value after change. A method for changing the settings of a wireless terminal connected to an ad hoc network and managed by a management device.
A change instruction information receiving step in which the communication apparatus receives change instruction information including a setting value after changing at least one of the frequency channel and the PANID from the management apparatus;
A reset instruction information receiving step in which the communication apparatus receives from the management apparatus reset instruction information urging change of a setting value;
When the processing apparatus receives the reset instruction information in the reset instruction information receiving step, the change instruction received in the change instruction information receiving step is a setting value of at least one of the frequency channel and the PANID stored in the storage device in advance. A setting change step for changing to a setting value after change included in the information.

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