JP6021031B2 - Wireless device, wireless network - Google Patents

Description

  The present invention relates to a wireless device capable of configuring a network and a wireless network including the wireless device, and more particularly to a wireless network including a wireless device capable of switching between a reception standby state and a state in which the reception is not possible, and wireless transmission to the wireless device. It is related with the radio | wireless apparatus to perform.

  A system (so-called smart utility network) that collects various types of information such as water, gas, and power consumption is conceived by providing wireless functions to meter devices installed in single-family houses and apartment houses. (See IEEE 802.15.4g etc. as a wireless standard).

  Since such a network covers a sufficient service area, there is a high need for wireless signal relay technology. In relay nodes that relay radio signals, when power saving is required, such as battery operation, it is important to introduce a technology that effectively introduces a state that is not in a standby state (sleep state) and extends the operation period. Conceivable.

  However, when the relay node is in a sleep state, even if a communication packet is transmitted to the relay node, it is not received. Therefore, the accuracy of actual communication is lowered, and the communication efficiency may be lowered. In addition, when the number of relay nodes increases and information is collected via a large number of relay nodes, there may be relay nodes in which the number of incoming communication packets is concentrated, and there is a concern that the communication efficiency may be reduced due to this. The

IEEE 802.15.4g standard specification (draft standard)

  The present invention has been made in consideration of the above-described circumstances, and is a wireless device capable of starting wireless communication with sufficient accuracy for a wireless network including a wireless device that switches between a reception standby state and a state where it is not. It is an object of the present invention to provide a wireless network including a wireless network and a wireless device capable of suppressing the number of incoming communication packets located in the wireless network.

In order to solve the above problem, a wireless network according to an aspect of the present invention generates a communication packet having a synchronization signal section, a header section following the synchronization signal section, and a payload section following the header section. 1 means, second means for generating an extended synchronization signal, and third means for generating a transmission signal accompanied by a response request by adding the communication packet subsequent to the extended synchronization signal; a fourth means for wirelessly transmitting said transmission signal, a first wireless device with a control of the states set not to receive standby state or the standby state receives the own apparatus, the number of communication packets arriving if necessary to limit the time rate of the reception standby state, and fifth means for performing to decrease with respect to time rate not to the reception standby state, the device itself the reception waiting A sixth means for receiving the communication packet included in the transmission signal when detecting the extended synchronization signal included in the transmission signal wirelessly transmitted by the first wireless device when in a reception state; A second wireless device comprising: seventh means for providing, by a wireless signal, schedule information for the device itself to be in a reception standby state in response to receiving the communication packet; It is characterized by comprising.

  This wireless network is a network that includes the first wireless device. In this wireless network, the second wireless device provides “scheduling information in which the device itself is in a reception standby state in response to the reception of the communication packet by a wireless signal. The reason for having “the means” is as follows. In other words, this allows the first wireless device to be notified when the second wireless device is in a reception standby state, and thereafter allows the second wireless device to perform transmission at that timing. It is to do. In other words, this means that the first wireless device is ready to join the wireless network.

In addition, the wireless device according to another aspect of the present invention controls the state setting of whether to set the own device to the reception standby state or not to the reception standby state , according to the necessity to limit the number of incoming communication packets. The first means for reducing the time ratio to enter the reception standby state with respect to the time ratio not to enter the reception standby state, and another wireless device transmits wirelessly when the own device is in the reception standby state When a synchronization signal included in the transmission signal is detected, the second means for receiving the communication packet included in the transmission signal and the other wireless device in response to the reception of the communication packet. apparatus characterized by comprising a third means for providing a wireless signal schedule information is in a state waiting reception.

  This wireless device has “first means for controlling the state setting of whether to set the own device in a reception standby state or not in a reception standby state”, and further, “the first means is an incoming communication. In accordance with the necessity of limiting the number of packets, the control is performed to reduce the time ratio for setting the reception standby state to the time ratio for not setting the reception standby state. If the time ratio for setting the reception standby state is decreased, the probability of picking up an “extended synchronization signal” or a normal synchronization signal of another device is decreased. Therefore, according to this, if it is necessary to limit the number of incoming communication packets, it is possible to reduce the number of other wireless devices that can join the network via this wireless device, thereby suppressing the number of incoming communication packets It becomes possible to do.

  According to the present invention, a wireless network including a wireless device capable of starting wireless communication with sufficient accuracy for a wireless network including a wireless device that switches between a reception standby state and a state in which the reception is not performed, and the wireless network It is possible to provide a wireless device capable of suppressing the number of communication packets that arrive at the location.

Regardless of the description below, the illustrations of FIG . 1 and FIG. 2 are merely examples for reference. However, items to be referred to as the configuration of the invention are included.
1 is a block diagram illustrating a configuration of a wireless device according to an embodiment of the present invention. The block diagram which shows the structure of the radio | wireless apparatus assumed as the object which the radio | wireless apparatus shown in FIG. 1 performs network presence confirmation. FIG. 3 is an explanatory diagram illustrating a connection relationship between a plurality of wireless devices including the wireless device illustrated in FIG. 1 and the wireless device illustrated in FIG. 2. Explanatory drawing which shows the flow of the information between each radio | wireless apparatus shown in FIG. The signal block diagram which shows the example of the format of the transmission signal accompanying the response request which the radio | wireless apparatus shown in FIG. 1 transmits. The block diagram which shows the structure of the radio | wireless apparatus which is another embodiment of this invention. FIG. 7 is an explanatory diagram illustrating a connection relationship between a plurality of wireless devices including the wireless device illustrated in FIG. 6. Explanatory drawing which shows the flow of the information between each radio | wireless apparatus shown in FIG.

  As an embodiment of the present invention, the extended synchronization signal generated by the second means is a signal that repeats a part or all of the synchronization signal included in the synchronization signal section of the communication packet. can do. A normal wireless device is configured to detect and react to a synchronization signal of a communication packet and subsequently receive the communication packet. Therefore, if the extended synchronization signal is provided in this way, the change in the configuration of the receiving radio apparatus can be minimized.

  Further, as an embodiment, the extension synchronization signal generated by the second means includes a payload portion having a signal different from a signal included in the payload section of the communication packet, and the content of the payload preceding the payload portion. And a dummy packet having a header portion reflecting the synchronization portion and a synchronization portion that is the same signal as the synchronization signal included in the synchronization signal section of the communication packet preceding the header portion is a signal that is repeated a plurality of times. Can do. The extended synchronization signal may be a slightly complicated signal. For example, each payload part may have information reflecting a serial number that is repeated a plurality of times (and possibly the total number of repetitions).

  As an embodiment, the extended synchronization signal generated by the second means may be a signal that repeats the same communication packet as the communication packet generated by the first means a plurality of times. The extended synchronization signal may be provided by using the original communication packet as described above. According to this, the hardware change is small as this radio | wireless apparatus.

  Further, as an embodiment, the own apparatus is set in a reception waiting state or a reception waiting state so as to be time-synchronized with the state setting of the second wireless apparatus controlled by the fifth means of the second wireless apparatus. It may be further provided with a third wireless device in which the state is set to be in the state. In this wireless network, the second wireless device and the third wireless device enter a reception standby state at the same timing. The second wireless device and the third wireless device can be positioned as a kind of subnetwork located in the entire wireless network. Such a sub-network can be provided in the sense of, for example, a set of wireless devices that are divided by reducing the load on one wireless device.

  Based on the above, embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a wireless device according to an embodiment of the present invention. As shown in FIG. 1, the wireless device includes a communication packet generation unit 11, an extended synchronization signal generation unit 12, a transmission signal generation unit 13, a wireless transmission / reception unit 14, and a reception signal processing unit 15.

  The communication packet generator 11 generates a communication packet including information to be transmitted. As is well known, for example, the communication packet has a synchronization signal section, a header section following the synchronization signal period, and a payload section following the header section. The information placed in the payload section corresponds to the original communication content, the header indicates additional information (for example, data capacity, transmission source, final transmission destination, etc.) regarding the payload information, and the synchronization signal section is not shown. This is a section for providing a signal for synchronization necessary for the reception side to receive the signal of this packet. The communication packet generated by the communication packet generator 11 is sent to the transmission signal generator 13.

  The extended synchronization signal generation unit 12 generates a synchronization signal (hereinafter referred to as an extended synchronization signal) different from the synchronization signal included in the communication packet generated by the communication packet generation unit 11. The specific format of this extended synchronization signal will be described later (FIG. 5). The extended synchronization signal generator 12 may not function in a state where the wireless device 10 has already joined (or can join) the wireless network. That is, when this radio apparatus 10 newly confirms its existence in order to join a certain radio network, the generated extended synchronization signal is sent to the transmission signal generator 13.

  The transmission signal generation unit 13 generates a signal to be transmitted based on the communication packet transmitted from the communication packet generation unit 13. If the wireless device 10 has already joined the wireless network, the communication packet sent from the communication packet generator 13 becomes the transmission signal as it is. When the wireless device 10 newly confirms the existence to join a wireless network, a response request is made by adding a communication packet following the extended synchronization signal from the extended synchronization signal generation unit 12. A transmission signal with The transmission signal generated by the transmission signal generation unit 13 is sent to the wireless transmission / reception unit 14.

  The wireless transmission / reception unit 14 wirelessly transmits the transmitted transmission signal. In addition, a signal transmitted wirelessly from another wireless device is received. When receiving a signal from another wireless device, the synchronization signal included in the signal is first detected, thereby establishing a reception state and receiving a communication packet. Received signals from other wireless devices are sent to the received signal processing unit 15.

  The reception signal processing unit 15 performs necessary reception processing using information included in the signal transmitted from the wireless transmission / reception unit 14.

  According to the wireless device 10, an extended synchronization signal is added prior to the communication packet, and wireless transmission is performed. The probability that another wireless device picks up the extended synchronization signal is surely increased more than the probability that another wireless device picks up the synchronization signal included in the wireless transmission of only the communication packet. This is because the probability that the extended synchronization signal overlaps the reception standby state as a timing is higher than the probability that the normal synchronization signal overlaps even if the other wireless device switches between a reception standby state and a state where it does not. This is because it becomes considerably large.

  Therefore, the wireless device 10 receives a response request with sufficient accuracy for a wireless network including a wireless device that switches between a reception standby state and a non-reception state, and the wireless device 10 captures the response so that the network is received. Can be confirmed. As a result, the wireless communication can be started thereafter for the network.

  Next, FIG. 2 is a block diagram illustrating a configuration of a wireless device that is assumed as a target on which the wireless device illustrated in FIG. 1 performs network presence confirmation. As shown in the figure, the wireless device 20 includes a reception standby state setting control unit / schedule information holding unit 21, a wireless transmission / reception unit 22, and a reception signal processing unit 23.

  The reception standby state setting control unit / schedule information holding unit 21 first controls the state setting as to whether the device 20 is in a reception standby state or not in a reception standby state as a reception standby state setting control unit. In the reception standby state, the device 20 can receive transmission signals from other wireless devices (the control unit 21 controls the wireless transmission / reception unit 22 to function as a reception unit). When not in a reception standby state (so-called sleep state), at least the control unit 21 controls the wireless transmission / reception unit 22 so as not to function as a reception unit (simple power off).

  Further, the reception standby state setting control unit / schedule information holding unit 21 holds schedule information as to whether the device 20 is in a reception standby state or not in a reception standby state as a schedule information storage unit. In other words, according to this schedule, as described above, the device 20 is controlled to be in a reception standby state or not to be in a reception standby state. This schedule may be determined autonomously or exclusively with respect to other wireless devices, or may be determined in consideration of some degree of cooperation with other wireless devices. In order to perform such cooperation, communication for the purpose may be separately performed with another wireless device.

  First, the wireless transmission / reception unit 22 can have the same function as the wireless transmission / reception unit 14 of the wireless device 10 illustrated in FIG. 1 as a wireless transmission unit. That is, this device 20 shows a wireless device assumed as a target for which the wireless device 10 shown in FIG. 1 is to make a response request, but makes a response request to another wireless device as this device 20, Alternatively, it may be a wireless device that has already joined the network and performs packet communication through this (the same applies to the following description. In FIG. 2, the communication packet generator 11, the extended synchronization signal generator 12, the transmission signal) It can be considered that the generation unit 13 is not shown).

  When the wireless device 10 shown in FIG. 1 wirelessly transmits a transmission signal accompanied by a response request as a reception unit, when the wireless device 10 is in a reception standby state, the wireless device 10 shown in FIG. The action can be performed. In other words, the extended synchronization signal included in the transmission signal transmitted wirelessly by the wireless device 10 is detected, and the communication packet included in the transmission signal is subsequently received. Since the signal including the extended synchronization signal is accompanied by a response request, the wireless transmission / reception unit 22 notifies the reception standby state setting control unit / schedule information holding unit 21 to that effect.

  In response to this, the reception standby state setting control unit / schedule information holding unit 21 sends to the wireless transmission / reception unit 22 the schedule information that the apparatus 20 itself holds and enters the reception standby state. Therefore, the wireless transmission / reception unit 22 provides the wireless device 10 shown in FIG. 1 with schedule information in which the device 20 is in a reception standby state by a wireless signal. This wireless signal may be a known communication packet.

  As a result, the wireless device 10 shown in FIG. 1 can know when the wireless device 20 is in a reception standby state, so that wireless communication can be started for the wireless device 20 thereafter. . That is, a necessary communication packet can be transmitted to the wireless device 20 at the reception standby timing indicated by the schedule information (however, it may be selected not to start communication with the wireless device 20 at this time depending on circumstances). ). That is, this state means that the wireless device 10 can always join the network to which the wireless device 20 belongs via the wireless device 20.

  The reception signal processing unit 23 has the same function as the reception signal processing unit 15 of the wireless device 10 illustrated in FIG. For example, if the wireless device 10 shown in FIG. 1 has already joined the network to which the wireless device 20 belongs, a communication packet wirelessly transmitted from the wireless device 10 is received via the wireless transmission / reception unit 22. The signal is sent to the signal processor 23 where necessary processing is performed.

  Next, FIG. 3 is an explanatory diagram showing a connection relationship between a plurality of wireless devices including the wireless device 10 shown in FIG. 1 and the wireless device shown in FIG. In FIG. 3, the wireless device 10 is the device itself shown in FIG. 1, and the wireless devices 20A, 20B, 20C, and 20D each have the same configuration corresponding to the device shown in FIG. .

  Network N is an already configured network. Arrows in the network N indicate the flow of communication packets. These arrows indicate the following: That is, the device 20C knows when the device 20A enters the reception standby state, and sends a communication packet to the device 20A accordingly (that is, the device 20C joins the network N through the device 20A). doing). The relationship between the device 20A and the device 20B is the same.

  Here, the relationship between the device 20A and the device 20D is a relationship in which the timing of entering the reception standby state is exactly the same. Such a relationship can be regarded as a kind of sub-network in the network N. That is, generally, sub-networks have different reception standby state timings, and a set of devices having the same reception standby state timing is a sub-network. In FIG. 3, by this definition, there are three sub-networks of sub-networks S1, S2, and S3. A subnetwork (subnetwork S1) having a plurality of devices (wireless devices 20A and 20D) can be provided as a set of wireless devices that are originally divided by reducing the load of one wireless device.

  Assume that the wireless device 10 newly confirms the existence of the network with respect to the network N configured as shown in FIG. For this reason, the apparatus 10 performs the radio transmission of the communication packet with the extended synchronization signal as described above. This wireless transmission is assumed to physically reach the devices 20A, 20C, 20B.

  Under the assumption, FIG. 4 is an explanatory diagram showing a flow of information between the wireless devices shown in FIG. The horizontal axis in FIG. 4 represents the flow of time, and the reference numerals on the vertical axis indicate the respective wireless devices shown in FIG.

  Referring to FIG. 4, first, when device 10 transmits a communication packet accompanied by an extended synchronization signal, the wireless transmission happens to be caught in the reception waiting state of device 20A (timing 1). As a result, the apparatus 10 can obtain the reception standby schedule information from the apparatus 20A as already described (timing 2). Therefore, thereafter, the device 10 can transmit necessary information in the form of a normal communication packet toward the device 20A in anticipation of the device 20A being in a reception standby state (timing 3, 4, 5).

  Note that here, only the timing information of the device 20A is obtained, and the operation of confirming the presence of the network is performed again. As a result, necessary information is transmitted to another device different from the device 20A (the other device). In some cases, the network is joined via This is conceivable when the electric field intensity from the device 20A is low, or the schedule information is not suitable for the transmission timing of information to be transmitted by the own device 10.

  The arrows between the devices 20A, 20B, 20C, and 20D in FIG. 4 are communication packet flows corresponding to the arrows in the network N shown in FIG. As shown in FIG. 4, these communication packets can generally be transmitted as long as the receiving side is in the reception standby state even when the transmission side apparatus is not in the reception standby state.

  Note that when the device 10 transmits a communication packet with an extended synchronization signal, it may happen that the device 10 is caught in the reception standby state of a plurality of devices depending on the timing setting of the reception standby state. In such a case, since the device 10 can obtain schedule information from each of the plurality of devices, an appropriate device can be selected as a network destination device from the received information. For example, the device that sent the schedule information first is selected, the device that sent the schedule information and the radio field strength is high, and so on. Since the transmission source of the device that has sent the schedule information is described in the header of the communication packet, the device 10 joins the network with this transmission source as the transmission destination.

  Next, FIG. 5 is a signal configuration diagram illustrating an example of a format of a transmission signal accompanied by a response request transmitted by the wireless device 10 illustrated in FIG.

  In FIG. 5A, the extended synchronization signal is a signal that repeats a part or all of the synchronization signal included in the synchronization signal section of the communication packet. A normal wireless device is configured to detect and react to a synchronization signal of a communication packet and subsequently receive the communication packet. Therefore, if the extended synchronization signal is provided in this way, the change in the configuration of the receiving radio apparatus can be minimized. Specific examples of the extended synchronization signal in this case include repetition of 01, or a signal in which the repetition of 01 is repeated a plurality of times and then one sequence of 1 is repeated a plurality of times.

  In FIG. 5 (b), the extended synchronization signal includes a payload portion having a signal different from the signal included in the payload section of the communication packet, a header portion reflecting the content of the payload preceding the payload portion, A dummy packet having a synchronization portion that is the same signal as the synchronization signal included in the synchronization signal section of the communication packet prior to the header portion is a signal that is repeated a plurality of times. The extended synchronization signal may be a slightly complicated signal. For example, each payload part may have information reflecting a serial number that is repeated a plurality of times (and possibly the total number of repetitions). A fixed interval may be provided between the dummy packets.

  In FIG. 5C, the extended synchronization signal is a signal that repeats the same communication packet as the original communication packet a plurality of times. The extended synchronization signal may be provided by using the original communication packet in this way. According to this, the hardware change is small as a radio | wireless apparatus. In the extended synchronization signal section, a fixed interval may be provided between communication packets.

  Next, a radio apparatus according to another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram illustrating a configuration of a wireless device according to another embodiment. The wireless device 200 is positioned by modifying a part of the structure of the wireless device 20 shown in FIG. The purpose is to make it possible to suppress the number of incoming communication packets as required to limit the number of incoming communication packets.

  As illustrated in FIG. 6, the wireless device 200 includes a reception standby state setting control unit / schedule information holding unit 201, a wireless transmission / reception unit 22, and a reception signal processing unit 203. Among these, the wireless transmission / reception unit 22 has the same function as that of the same name that the wireless device 20 shown in FIG. 2 has.

  In addition to the functions of the reception signal processing unit 23 of the wireless device 20 shown in FIG. 2, the reception signal processing unit 203 notifies the reception standby state setting control unit / schedule information holding unit 201 of the notification of the processing load amount. It has the function to perform.

  The reception standby state setting control unit / schedule information holding unit 201 receives an incoming communication packet when the notified load amount is large, in addition to the functions of the wireless device 20 having the same name shown in FIG. It is determined that it is necessary to limit the number, and in accordance therewith, a function is provided for reducing the time ratio for setting the reception standby state to the time ratio for not setting the reception standby state. With this decrease, the information held by the schedule information holding unit 201 is rewritten.

  When the time ratio for setting the reception standby state in this way is reduced, the probability that the device 200 picks up the extended synchronization signal (or normal synchronization signal) of the other device is reduced. Therefore, according to this, when it is necessary to limit the number of incoming communication packets, it is possible to reduce other wireless devices that can newly join the network via the wireless device 200, and thereby incoming communication packets. The number can be suppressed.

  The above points will be described again with reference to FIG. FIG. 7 is an explanatory diagram illustrating a connection relationship between a plurality of wireless devices including the wireless device 200 illustrated in FIG. 6. 7, the wireless device 10 is the device itself shown in FIG. 1, and the wireless devices 200A and 200B have the same configuration corresponding to the device shown in FIG. 20F have the same configuration corresponding to the apparatus shown in FIG.

  The wireless devices 200A, 200B, 20E, and 20F already configure a network. Arrows in the network indicate the flow of communication packets. These arrows indicate the following: That is, the device 200B knows when the device 200A is in a reception standby state, and sends a communication packet to the device 200A accordingly (that is, the device 200B joins the network via the device 200A). ing). The relationship between the device 20E and the device 200A and the relationship between the device 200A and the device 20F are the same.

  Assume that the wireless device 10 newly confirms the existence of the network with respect to the network configured as shown in FIG. For this reason, the apparatus 10 performs the radio transmission of the communication packet with the extended synchronization signal as described above. This wireless transmission is assumed to physically reach the devices 200A and 200B.

  Under the assumption, FIG. 8 is an explanatory diagram showing the flow of information between the wireless devices shown in FIG. The horizontal axis in FIG. 8 represents the flow of time, and the reference numerals on the vertical axis indicate the respective wireless devices shown in FIG. The arrows between the devices 200A, 200B, 20E, and 20F in FIG. 8 are communication packet flows corresponding to the arrows in the network shown in FIG.

  As shown in FIG. 8, in this case, the apparatus 200 </ b> A has a reduced time during which it waits for reception. This is because, with reference to FIG. 7, apparatus 200A receives communication packets from apparatus 200B and apparatus 20E, performs the processing, and determines that the load amount is large. On the other hand, as shown in FIG. 7, the device 200B is not currently a communication packet receiving side, and therefore the load amount is not large, so that the time to enter the reception waiting state is reduced. Absent.

  Referring to FIG. 8, when device 10 transmits a communication packet accompanied by an extended synchronization signal, the wireless transmission is captured in the reception waiting state of device 200B instead of device 200A (timing 6). As a result, the apparatus 10 can obtain the reception standby schedule information from the apparatus 200B (timing 7). Therefore, after that, the device 10 can transmit necessary information to the device 200B in the form of a normal communication packet in anticipation of the device 200B being in a reception standby state.

  In this example, when the time ratio at which the device 200A is in the reception standby state is decreased, the probability that the device 200A picks up the extended synchronization signal (or the normal synchronization signal) of the device 10 which is another device decreases. Therefore, according to this, when it is necessary to limit the number of incoming communication packets, it is possible to reduce another wireless device that can newly join the network via the wireless device 200A, and thereby the incoming communication packet The number can be suppressed.

  In FIG. 7 again, when the final destination of the information transmitted by the device 10 is, for example, the device 20F, the devices 200A and 200B can both be relay devices for information sent from the device 10. In such a case, if there is a mechanism for suppressing the number of incoming communication packets as described above, the processing load on each device as a relay device is leveled as a result, thereby improving the performance of the entire network. Can be achieved. It is highly effective when applied to a sensor network that collects various types of information such as water, gas, and power consumption.

  DESCRIPTION OF SYMBOLS 10 ... Radio | wireless apparatus, 11 ... Communication packet production | generation part, 12 ... Extended synchronization signal production | generation part, 13 ... Transmission signal production | generation part, 14 ... Radio transmission / reception part, 15 ... Reception signal processing part, 20, 20A, 20B, 20C , 20D, 20E, 20F ... wireless device, 21 ... reception standby state setting control unit / schedule information holding unit, 22 ... wireless transmission / reception unit, 23 ... received signal processing unit, 200, 200A, 200B ... wireless device, 201 ... Reception standby state setting control unit / schedule information holding unit, 203... Reception signal processing unit.

Claims (3)

A first means for generating a communication packet having a synchronization signal section, a header section following the synchronization signal section, and a payload section following the header section; a second means for generating an extended synchronization signal; A first means for generating a transmission signal accompanied by a response request by adding the communication packet after the extension synchronization signal; and a fourth means for wirelessly transmitting the transmission signal. A wireless device;
Control of the state setting whether to put the device in the reception standby state or not in the reception standby state. And a fifth means for reducing the time ratio to be transmitted, and the extended synchronization signal included in the transmission signal wirelessly transmitted by the first wireless device when the device is in the reception standby state. When detected, a sixth means for receiving the communication packet included in the transmission signal, and in response to the reception of the communication packet, the device enters a reception waiting state for the first wireless device. And a second wireless device having a seventh means for providing the schedule information as a wireless signal.   A state in which the device is in a reception standby state or not in a reception standby state so as to be time-synchronized with the state setting of the second wireless device controlled by the fifth means of the second wireless device The wireless network according to claim 1, further comprising a third wireless device to be set. Control of the state setting whether to put the device in the reception standby state or not in the reception standby state. A first means for performing a reduction with respect to a non- performing time ratio ;
A second means for receiving a communication packet included in the transmission signal when a synchronization signal included in a transmission signal wirelessly transmitted by another wireless device is detected when the own device is in the reception standby state;
A third means for providing, as a radio signal, schedule information for the own apparatus to enter a reception standby state for the other radio apparatus in response to reception of the communication packet ;
Radio apparatus characterized by comprising a.

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