JP2016111396A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication device that dynamically determines the presence/absence of a node or the existence/non-existence of a node on a relay path used when a plurality of nodes perform radio communication.SOLUTION: In a radio communication device, a plurality of nodes perform radio communication with each other by a preassigned scheme. The radio communication device comprises: an address code setting table registering the response order of responding nodes per address code; a preassigned table registering a destination IP address and a destination MAC address with a subscriber node number, a response number, and a communication available node using the address code as a key. When receiving data from any node, the radio communication device searches for a destination MAC address of communication available node referring to the preassigned table, does not transmit if there is no destination MAC address, and sets a transmission node if there is a destination MAC address.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wireless communication apparatus used as a node in a system in which N to N data transmission is performed between a plurality of predetermined nodes via a wireless line.

  There are various wireless communication methods such as one-to-one facing communication (Peer to Peer method, Master-Slave method), one-to-N broadcast communication, and N-to-N group communication. They are also classified into land mobile systems, marine mobile systems, land fixed systems, relays using satellites, etc. Of these, the land mobile system generally adopts a configuration in which base stations and access points are installed in a service area and these base stations or access points are connected via a wired network. A typical example of such a land mobile system is a mobile phone network.

  On the other hand, as access technologies for performing communication by sharing the same radio channel between a plurality of radio stations, there are a TDMA (Time Division Multiple Access) system, a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) system, and the like. The TDMA system is one of the systems used for wireless communication such as a mobile phone system, and shares a single frequency with a plurality of callers alternately for a short time. This method is used in PDC and GSM (registered trademark), which are second-generation mobile phone systems. On the other hand, the CSMA / CA method is used in a wireless LAN adopting IEEE 802.11, in which each station autonomously determines the transmission timing of a packet (frame) by monitoring the use status of the wireless channel.

  By the way, a marine mobile system cannot install a base station in a service area. For this reason, in this type of system, a method is employed in which communication is performed without depending on a base station or an access point by performing ad hoc communication between wireless stations using an access method such as the CSMA / CA method. . In such a system, when performing 1 to N broadcast communication, multicast or broadcast may be used by ad hoc communication. However, when performing N to N group communication, ad hoc communication and multicast or broadcast alone may be used. Cannot be realized.

  In both 1-to-N broadcast communication and N-to-N group communication, when the CSMA / CA method is used as an access method, waiting time control is performed to avoid mutual communication collision. One of the waiting time control factors is propagation delay time. When controlling the waiting time, it is necessary to consider this propagation delay time. To reliably control the response (ACK), it is necessary to set a waiting time that maximizes the assumed communication distance. However, if the waiting time is fixed when the communication distance is set to the maximum or the communication distance is set to the longest distance in the N-to-N group communication, conversely, if the distance is short, the real-time characteristics of the communication The throughput is also inferior to the ideal value. Furthermore, when considering N-to-N group communication, the opportunity to acquire a radio channel depends on the backoff time of the CSMA / CA scheme, and thus transmission opportunities are not necessarily obtained equally.

  Therefore, a technique has been proposed in which a transmission opportunity is obtained evenly in N-to-N group communication without waiting time being influenced by propagation delay time. In this technique, when a response order is set in advance in a plurality of transmission / reception stations, and one of the plurality of transmission / reception stations transmits data, the data including the transmission source of the data is included in the data from the transmission / reception stations in higher order Are sequentially transmitted (see, for example, Patent Document 1).

  In such a system, there is no need to set a propagation delay between the transmission source station and the reception destination station and a waiting time in consideration of collision avoidance of response signals from each reception destination. Thus, the response signal can be returned efficiently.

JP 2012-049948 A

  However, in the above CSMA / CA scheme, carrier sense is performed to avoid collision, and after carrier sense, a fixed waiting time DIFS (Distributed access Inter Frame Space) and a random waiting time (backoff) are set. Wait and send frame. In order to know whether or not the transmitted frame has been received reliably, a response frame called ACK is transmitted from the receiving side. For example, when data collision or the like occurs and data or ACK cannot be received, the frame is retransmitted. That is, in the CSMA / CA system, a waiting time is always required before transmission starts.

The pre-assignment method, which is a technique described in Patent Document 1, is a communication method that avoids data collision without waiting time by transmitting in a predetermined response order. Compared to the CSMA / CA method, carrier sense, DIFS, and back-off time are omitted, so high-speed communication can be performed.
The pre-assignment communication flow is as follows.
[1] A group for performing pre-assignment communication is determined in advance.
[2] The response order is determined within the group. (Up to here is the address code setting.)
[3] Pre-assignment communication is started when one node performs transmission by the pre-assignment method.
[4] In response to the data being transmitted, each node in the group transmits a response according to the response order.
[5] One pre-assignment cycle is completed by the response of the node in the final response order.
Thus, in the pre-assignment method, it is possible to perform high-speed communication by determining a group in advance and operating each node in accordance with the group.
However, a node that is not registered in the group cannot perform pre-assign communication. Also, if there is a nonexistent node, it will wait for its timeout, and the efficiency will decrease. There is also a problem that only one-hop communication is possible within the group.

  The present invention has been made in view of such a conventional situation, and in a wireless communication apparatus that performs wireless communication between a plurality of nodes by a pre-assignment method, the presence / absence of a node present in a relay route and the presence / absence of the node are determined. An object of the present invention is to provide a wireless communication apparatus that can make a dynamic determination, is easy to use, and enables efficient wireless communication.

  In order to achieve the above object, a wireless communication apparatus according to the present invention provides an address code in which a response order of nodes responding for each address code is registered in a wireless communication apparatus that performs wireless communication between a plurality of nodes by a pre-assignment method A setting table and a pre-assign table in which a destination IP address and a destination MAC address are registered in a node that can be joined, a response number, and a communicable node by using the address code as a key. Upon reception, the presence / absence of a destination MAC address of a communicable node is searched by referring to the pre-assign table, and if there is no destination MAC address, transmission is not performed, and if there is the destination MAC address, transmission is performed. It is characterized by setting a node.

  In addition, a wireless communication apparatus according to the present invention for achieving the above object provides a preassignment in the preassignment table in the above wireless communication apparatus, if there is a node that needs to be relayed among the communicable nodes. It is characterized by adding a group.

  In addition, a wireless communication device according to the present invention for achieving the above object provides a destination of a node capable of communicating with reference to the pre-assign table when data is received from an arbitrary node in the wireless communication device described above. The presence or absence of a MAC address is searched, and if there is no destination MAC address, a new pre-assign group from which the node is deleted is generated.

  According to the present invention, in a wireless communication apparatus that performs wireless communication between a plurality of nodes by a pre-assignment method, it is possible to dynamically determine the presence / absence of a node existing in a relay route and the presence / absence of a node, which is easy to use. A wireless communication device capable of efficient wireless communication can be provided.

It is a figure which shows an example of a structure of the N to N radio | wireless communications system which concerns on one Embodiment of this invention. It is a block diagram which shows an example of a structure of the radio | wireless communication apparatus used for the transmission / reception station (node) of the radio | wireless communications system shown in FIG. FIG. 3 is a block diagram illustrating a configuration of a MAC layer processing unit 12 of the wireless communication device 1 illustrated in FIG. 2. It is a figure which shows the basic sequence at the time of data transmission using the pre-assign method between several nodes shown in FIG. It is a figure which shows an example of a structure in case the relay between nodes is required in the radio | wireless communications system which concerns on one Embodiment of this invention. In the radio | wireless communications system which concerns on one Embodiment of this invention, it is a figure which shows the other structural example when a relay is required between nodes. It is a figure which shows the image of the address code setting screen in the radio | wireless communication apparatus. It is a figure which shows an example of an address code setting table. It is a figure which shows an example of a pre-assign setting table. It is a flowchart which shows operation | movement of the radio | wireless communication apparatus 1 at the time of data reception.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Constitution]
FIG. 1 is a diagram illustrating an example of a configuration of an N-to-N wireless communication system according to an embodiment of the present invention. For example, a service area is provided in a place where a base station or an access point cannot be installed, such as at sea. Form.

  Each of the transmission / reception stations MS1 to MS3 (nodes A to C) has a first communication method (pre-assignment method) and a second communication method (CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance)) as communication methods. Provide a method. Note that each of the nodes A to C uses the same frequency band and also uses the same modulation / demodulation method regardless of whether the first communication method is used or the second communication method is used.

  The second communication method (CSMA / CA) is a method in which communication partners are not limited to nodes belonging to a communication group (all nodes that are subscribed to the communication system can be communication targets). This method starts transmission after confirming that the node is not transmitting.

  On the other hand, the first communication method (pre-assignment method) limits communication partners to nodes belonging to a communication group (in a communication group composed of two or more nodes among nodes that have joined the communication system). The node transmits data after confirming that no other node in the communication group is transmitting by the second communication method, and after this data transmission, all the nodes in the communication group Returns a response signal (ACK / NACK signal) in accordance with the response order assigned to itself in advance. When this first communication method is used, when each node receives a data signal or a response signal, it transmits the response signal in the order set in advance for itself, so that a source node and a plurality of destination nodes It is no longer necessary to set a waiting time in consideration of the propagation delay between and the collision avoidance of the response signal from each destination node, thereby enabling the response signal to be transmitted efficiently.

By the way, the transmitting / receiving stations MS1 to MS3 (nodes A to C) are configured as follows.
FIG. 2 is a block diagram illustrating an example of a configuration of a wireless communication device used in a transmission / reception station (node) of the wireless communication system illustrated in FIG.
That is, the transmission / reception stations MS1 to MS3 include a wireless communication device 1 including an antenna 2 and a router 3, and one or a plurality of data terminals (not shown) are connected to the router 3. As the data terminal, a personal computer, a tablet terminal, a smart phone or the like is used. The router 3 may be either a wired router or a wireless router.

The wireless communication apparatus 1 includes an IP layer processing unit 11, a MAC (Media Access Control) layer processing unit 12, a physical layer processing unit 13, a transmission unit 14, and a reception unit 15.
The IP layer processing unit 11 has a pre-assign table 301 (see FIG. 9 described later), an address code setting table 302 (see FIG. 8 described later), a communication group transmission routing function, and a reception routing function. The pre-assign table stores information in which the destination MAC address and the destination IP address are associated with each other of the nodes constituting the communication group. Further, route information is stored in the address code setting table. The route information includes routing information necessary for constructing a transmission route in the radio space and information related to the response order of the own node.

  When a data packet transmitted from a data terminal (not shown) is input via the router 3, the transmission routing function determines that the transfer destination of the data packet is sent to the node based on the destination IP address indicating the destination of the data packet. It is determined whether the data terminal is another accommodated data terminal or a data terminal accommodated in another node. If the transfer destination is another data terminal accommodated in the node, the data packet is returned to the router 3, while if the transfer destination is a data terminal accommodated in another node, the data packet is transmitted together with the transmission request to the MAC. Transfer to the layer processing unit 12. The reception routing function looks at the routing information of the received data packet passed from the MAC layer processing unit 12 to determine whether to receive or discard the data packet, and forwards it to the router 3 if received.

  The MAC layer processing unit 12 has a pre-assign table 301, an address code setting table 302, a channel acquisition control function for acquiring a radio channel by autonomous distributed control, a MAC frame transmission processing function, and a MAC frame reception response processing function. doing. The MAC frame transmission processing function generates a transmission MAC frame based on the data packet transferred from the IP layer processing unit 11, and synchronizes the generated MAC frame with the timing of the acquired radio channel. It passes to the processing unit 13. The MAC frame reception response processing function checks the destination and frame error for the received MAC frame passed from the physical layer processing unit 13 and refers to the address code setting table 302 to determine whether or not it is the response order of the own node. Check. When the destination is the own node and the response order of the own node, a response frame for the received MAC frame is generated and returned to the physical layer processing unit 13, and a data packet is reproduced from the received MAC frame. To the IP layer processing unit 11. The configuration of the MAC layer processing unit 12 will be described in detail later.

  The physical layer processing unit 13 converts the transmission MAC frame and response frame passed from the MAC layer processing unit 12 into a transmission baseband signal using a predetermined modulation method, and outputs the transmission baseband signal to the transmission unit 14. 15 has a function of demodulating the received baseband signal output from 15 to reproduce a received MAC frame and outputting it to the MAC layer processing unit 12.

  The transmission unit 14 converts the transmission baseband signal output from the physical layer processing unit 13 into a predetermined radio frequency signal and transmits it from the antenna 2. The receiving unit 15 converts the radio frequency signal received by the antenna 2 into a reception baseband signal and outputs the received baseband signal to the physical layer processing unit 13.

FIG. 3 is a block diagram illustrating a configuration of the MAC layer processing unit 12 of the wireless communication apparatus 1 illustrated in FIG.
The MAC layer processing unit 12 includes a reception processing unit 21, a reception frame analysis unit 22, a communication control unit 23, a data request confirmation unit 24, a MAC frame generation unit 25, a path information control unit 26, and a storage unit 27. And a frame connection unit 28 and a transmission processing unit 29.

  The route information control unit 26 obtains route information from the IP layer processing unit 11 and stores it in the storage unit 27. The route information includes information related to the response order of the own node in addition to the routing information. The route information control unit 26 re-acquires the latest route information even when the route information stored in the IP layer processing unit 11 is updated, and updates the information held in the storage unit 27. The route information control unit 26 generates a MAC frame including the route information held in the storage unit 27 at the time of data transmission.

  The data request confirmation unit 24 monitors the arrival of the data packet and the transmission request from the IP layer processing unit 11, and notifies the communication control unit 23 of the request when the transmission request is sent, and generates the data packet as a MAC frame. Transfer to unit 25.

  When receiving a data transmission request notification from the data request confirmation unit 24, the communication control unit 23 instructs the MAC frame generation unit 25 to generate a MAC frame. Further, the communication control unit 23 acquires a radio channel by autonomous distributed control using a data transmission request as a trigger. When the wireless channel can be acquired, the frame connection unit 28 and the transmission processing unit 29 are instructed to execute the transmission operation.

  In response to the generation instruction from the communication control unit 23, the MAC frame generation unit 25 generates a MAC frame based on the data packet transferred from the IP layer processing unit 11. When there are a plurality of data packets, a MAC frame is generated for each data packet. One MAC frame has a variable length, but the maximum frame length is set to 1531 bytes.

  Upon receiving a transmission execution instruction from the communication control unit 23, the frame connection unit 28 transmits the MAC frame of the route information generated by the route information control unit 26 and the data packet generated by the MAC frame generation unit 25. The MAC frame is concatenated to generate a multi-MAC frame.

  The transmission processing unit 29 outputs the multi-MAC frame generated by the frame concatenating unit 28 to the physical layer processing unit 13 during the transmission period of the radio channel designated by the communication control unit 23.

  The reception processing unit 21 receives the received multi-MAC frame transferred from the physical layer processing unit 13 and transfers it to the received frame analysis unit 22. The reception frame analysis unit 22 separates the reception multi-MAC frame into a plurality of MAC frames. Then, for each separated MAC frame, it is determined whether or not the MAC frame is addressed to the own node based on the MAC address. If it is addressed to the own node, route information and user data are extracted from the payload of the MAC frame. To the IP layer processing unit 11. At the same time, the path information included in the first MAC frame among the separated MAC frames is analyzed to determine whether or not the response order of the own node. If the response order is the own node, communication control is performed. This is notified to the unit 23.

  When the communication control unit 23 receives notification from the received frame analysis unit 22 that it is the response order of the own node, the communication control unit 23 instructs the MAC frame generation unit 25 to generate a MAC frame including response information, and the frame connection unit 28. Is given a frame connection instruction. In response to the instruction, the MAC frame generation unit 25 generates a MAC frame including response information.

  The frame concatenation unit 28 concatenates the MAC frame including the path information and the MAC frame including the generated response information to generate a response multi-MAC frame.

  Further, at the time of the response, the communication control unit 23 determines whether there is user data to be transmitted by the own node based on the notification from the data request confirmation unit 24, and when there is transmission target data Instructs the MAC frame generation unit 25 to generate a MAC frame including the transmission target data. The frame concatenation unit 28 further concatenates the MAC frame of the transmission target data to the MAC frame including the route information and the MAC frame including the response information, and generates a response multi-MAC frame.

  Further, the storage unit 27 stores a pre-assign table 301 and an address code setting table 302 which will be described later.

  Further, the communication control unit 23 determines from the analysis result of the received MAC frame by the received frame analysis unit 22 whether or not the other nodes constituting the same communication group have received the user data transmitted by the own node. When the reception is completed, the presence / absence of untransmitted user data is determined based on the notification from the data request confirmation unit 24. If there is untransmitted data, transmission control of the untransmitted data is continued. To do.

[Operation]
Next, the operation of the transmission / reception stations MS1 to MS3 (nodes A to C) configured as described above will be described.
Here, as illustrated in FIG. 1, a case where nodes A to C configure a communication group and N to N group communication is performed between these nodes A to C will be described as an example. In order to perform group communication, route information is registered in advance in the wireless communication devices 1 of the nodes A to C. The route information includes routing information necessary for constructing a transmission route in the radio space and information related to the response order of the own node. The route information is appropriately updated according to the position and priority of the node.

  FIG. 4 is a diagram showing a basic sequence when data is transmitted between a plurality of nodes shown in FIG. 1 using a pre-assignment method. FIG. 4 shows a basic transmission / reception sequence when there is one data packet to be transmitted, that is, when a multi-MAC frame obtained by concatenating a MAC frame including path information and a MAC frame of the data packet is used. Yes. In the figure, the case where the propagation delay rate is approximately the same as the symbol rate is shown.

  The transmission / reception stations (nodes A to C) MS1 to MS3 have a response order indicating a response order when a response is requested. For example, in FIG. 4, the response rank is set higher for nodes A to C in the order of node B, node A, and node C. Note that the same response order is not set for different nodes in the same communication group.

  In FIG. 4, one node A that is a data transmission source includes a MAC frame including route information and a user data packet (a data packet representing information such as voice and image) after carrier sense (fixed waiting time). If the MAC frame “route information + data” is transmitted, the “route information + data” is received by the other nodes B and C belonging to the same communication group. When receiving the “route information + data”, each of the nodes B and C executes a response process. Since the response order of the node B is set to the first (1), the node B first includes the route information. A MAC frame “route information + ACK” including the MAC frame and response information ACK is returned.

  When the nodes A and C receive the “route information + ACK” sent back from the node B, the node A having the highest response rank (that is, the second rank (2)) among the nodes having a lower response rank than the node B. Transmits “route information + ACK”. Note that node A is the transmission source that first transmitted “route information + data”, but it prompts the node with a lower response rank to transmit “route information + ACK” and maintains the route even if it is the transmission source. In order to do this, “route information + ACK” is transmitted. Similarly, when node C receives “route information + ACK” from node A with the highest response rank, node C transmits “route information + ACK”.

  Whether or not the response order to the received “route information + ACK” is the order set in the own node is determined by the receiving terminal included in the route information of node A that first transmitted “route information + data”. Judgment is made based on the information relating the response rank. Specifically, the number of received responses is counted up by the communication control unit 23 of the MAC layer processing unit 12, or information indicating the response order of the transmission source is extracted from the ACK, and these values are the responses of the own node. This is done by determining whether or not the order matches.

When the node A which is the data transmission source receives the “route information + ACK” transmitted by the node C whose response order is set to the lowest order, the node A notifies the nodes B and C of the completion of the data transmission. Send "information + end". Whether or not the node C that has transmitted “route information + ACK” is the lowest node in the response order is checked by checking the response order included in the received ACK, or the number of received ACKs belongs to the communication group. This can be determined by determining whether or not it matches the number of subscriber stations (in this case, 3).
The above is the basic sequence.

The pre-assignment method is a method that can be used as a constraint condition only within one hop, that is, only a node capable of direct communication. That is, even if registered in the pre-assign group, for example, in the positional relationship as shown in FIG. 5, node A and node B can communicate directly, but node A and node C can communicate directly. Can not. Therefore, since relay through the node B is necessary, the pre-assignment communication cannot be performed, and the data transmission and response of the node A and the node C do not reach each other.
As a countermeasure in such a case, a method in which the node C approaches the node A can be considered, but it can be said that the user using the wireless communication device 1 is in an inconvenient state. It is the present invention that attempts to solve this situation.

Therefore, for example, as illustrated in FIG. 6, it is assumed that the node D performs communication by relaying the node B with a distance from the node A.
To implement the pre-assignment method, first, an address code is set. FIG. 7 is a diagram illustrating an image of an address code setting screen in the wireless communication device 1. In the wireless communication apparatus 1, address code setting registration is performed by an input operation from the address code setting screen 500 displayed on the display unit of a data terminal (not shown) connected to the wireless communication apparatus 1 via the router 3. Done.
By the operation on the address code setting screen 500, the order in which each node responds for each address code number is registered in the address code setting table 302 shown in FIG.
The address code setting table 302 is stored as address code information in the IP layer processing unit 11 and the MAC layer processing unit 12 of the wireless communication apparatus 1.
As shown in FIG. 9, the set address code information includes the number of subscriber stations, response number, destination IP address and destination MAC address for each wireless communication device 1 using the address code as a key. It is stored as a registered pre-assign table 301.

Note that the destination IP address and the destination MAC address can hold a plurality of information of communicable partners and are updated with link information.
As shown in FIG. 9, the wireless communication device 1 holds, as link information, whether communication with a node is possible (whether it is in a link state). This information is constantly updated.

For example, when the address code “2” is selected and the node A starts pre-assignment communication,
(1) The node A refers to the pre-assign table 301 and transmits to the communicable nodes B and C.
(2) The node B refers to the pre-assign table 301 and transmits a response to the communicable nodes A and D.
When transmitting to the node D, the presence / absence of the destination MAC address is searched on the pre-assign table 301 to identify the node to transmit. At this time, the link information is referred to and the pre-assign group (B, D) with the node D to be relayed is automatically generated as the address code “4”. Thereafter, in the case of a similar transmission partner, the generated pre-assign group is used.
If the destination MAC address is not found, it is discarded.
(3) The node C refers to the pre-assign table 301 and transmits a response to the communicable node A.
(4) The node D refers to the pre-assign table 301 and transmits a response to the communicable node B.
Node B sends a response to node A using the pre-assign group created in (2).
Thus, by using the pre-assign table to which the destination MAC address is added, the node A and the node D can perform pre-assign communication.

Here, the operation of each wireless communication device 1 at the time of data reception will be described. FIG. 10 is a flowchart showing the operation of the wireless communication device 1 when receiving data.
When the wireless communication device 1 receives the data, the wireless communication device 1 refers to the pre-assign table 301 and searches for a destination MAC address of a communicable node (step S101). If there is no destination MAC address (NO), the wireless communication device 1 ends the process. If there is (YES), a node to be transmitted is set (step S102).
Next, it is determined whether or not there is a node that needs to be relayed (step S103). If there is a node that needs to be relayed (YES), a pre-assign group is added to the pre-assign table 301 (step S104). ) Response transmission is performed using the newly created pre-assign group (step S105). In step S103, if there is no node that needs to be relayed (NO), the pre-assign table 301 is referenced and a response is transmitted to the communicable node.

  As described above, according to the wireless communication apparatus according to an embodiment of the present invention, in the wireless communication apparatus that performs wireless communication between a plurality of nodes by the pre-assignment method, the presence / absence of nodes existing in the relay route and the nodes Therefore, it is possible to provide a wireless communication device that can dynamically determine whether or not the wireless communication device is available, is easy to use, and can perform efficient wireless communication.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

MS1, MS2, MS3: transmitting / receiving station (node), 1: wireless IP communication device, 2: antenna, 3: router, 11: IP layer processing unit, 12: MAC layer processing unit, 13: physical layer processing unit, 14: Transmission unit, 15: reception unit, 21: reception processing unit, 22: received frame analysis unit, 23: communication control unit, 24: data request confirmation unit, 25: MAC frame generation unit, 26: path information control unit, 27: Storage unit, 28: frame concatenation unit, 29: transmission processing unit, 301: pre-assign table, 302: address code setting table, 500: address code setting screen.

Claims (3)

In a wireless communication device that performs wireless communication between a plurality of nodes by a pre-assignment method,
An address code setting table in which the response order of the nodes that respond for each address code is registered;
A pre-assign table in which a destination IP address and a destination MAC address are registered in a node capable of communication, a response number, and a node capable of communication, using the address code as a key;
When data is received from an arbitrary node, the presence / absence of a destination MAC address of a communicable node is searched with reference to the pre-assign table, and if there is no destination MAC address, transmission is not performed, and the destination MAC address A wireless communication apparatus that sets a node to transmit if there is.   2. The wireless communication apparatus according to claim 1, wherein if there is a node that needs to be relayed among the communicable nodes, a pre-assign group is added to the pre-assign table. In the wireless communication device according to claim 1, when data is received from an arbitrary node, the presence or absence of a destination MAC address of a communicable node is searched with reference to the pre-assign table, and if there is no destination MAC address, A wireless communication apparatus that generates a new pre-assign group from which the node is deleted.