JP2022188676A - Wireless system and wireless device - Google Patents

Abstract

To provide a wireless system and a wireless device capable of suppressing complication of configuration and more quickly changing communication channels of the entire network.SOLUTION: A wireless system comprises multiple wireless devices WD. The wireless device WD includes: a second communication unit 32 for transmitting "RIT Data Response" by specifying another wireless device WD when there is information to be transmitted to the another wireless device WD when receiving "RIT Data Request" from the another wireless device WD; a first determination unit 40 for determining whether it is in a wireless wave interference state; a third communication unit 33 for adding channel switching information to "RIT Data Response" to transmit the same, not in the specified state of the another wireless device WD only but to the surroundings when receiving "RIT Data Request" from the another wireless device WD when it is in the wireless wave interference state; and a channel switching unit 60 for switching the channel thereof, after transmitting the channel switching information.SELECTED DRAWING: Figure 2

Description

The present invention relates to radio systems and radios.

Conventionally, a radio handset installed in housing equipment, a center side device that collects various data of housing equipment, and a radio handset via a wireless line to collect various data of housing equipment A wireless system has been proposed that includes a wireless master unit that communicates with a center-side device through a line (see, for example, Patent Document 1). In this radio system, the radio base station has a carrier busy count section for periodically checking the radio wave condition. Therefore, when a busy state is detected in the frequency used for communication, the radio base unit notifies the center side device of the information to that effect.

JP 2004-180105 A

Here, the inventors of the present application consider changing the frequency used for wireless communication (changing the communication channel) when a busy state (radio interference state) is detected as in the wireless system described in Patent Document 1. doing.

However, when changing the communication channel, it is necessary to quickly change all of the multiple radios in the network. That is, if it takes a long time to change the communication channel, there will be a mixture of radios that have changed the communication channel and radios that have not changed the communication channel until the change is completed. Communication may be hindered.

Therefore, in order to change the communication channel, it is conceivable to install another communicable device. For example, communication between radios at normal times is performed in a specific frequency band, and if a separate device that communicates in a frequency band separate from the specific frequency band is installed in all of the multiple radios, radio waves By distributing communication channel change information over the entire network using another device when there is an interference state, the communication channel can be changed over the entire network.

However, in this case, it is necessary to install another device, which complicates the configuration.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and an object of the present invention is to provide a radio system and a radio system capable of suppressing the complication of the configuration and more quickly changing the communication channel of the entire network. to provide the machine.

A wireless system according to the present invention is capable of transmitting and receiving information in a network comprising a plurality of wireless devices, and a specific wireless device among the plurality of wireless devices is capable of transmitting and receiving information to and from a center. and for non-specified radio devices other than the specific radio device among the plurality of radio devices, information can be transmitted and received to and from the specific radio device via other non-specified radio devices or without via other non-specified radio devices. a wireless system for transmitting and receiving information to and from a center side through said specific wireless device, wherein said wireless device includes a first communication unit for transmitting first information to surroundings, and said first information from other wireless devices is received, when there is information to be transmitted to the transmission source of the first information, the transmission source of the first information is specified and the second information is transmitted, and thereafter the first information is transmitted. a second communication unit that transmits and receives information to and from the source; an interference judgment unit that judges whether the self is in a state of radio wave interference based on the radio wave intensity of the channel currently in use; when the first information is received from another wireless device, the channel switching information is added to the second information not only to the transmission source of the first information but also to the surroundings. a third communication unit that transmits channel switching information in addition to or instead of the second information; and a channel switching unit that switches its own channel after the channel switching information is transmitted by the third communication unit. , provided.

A wireless device according to the present invention includes: a first communication unit that transmits first information to surroundings; a second communication unit that designates the transmission source of the first information and transmits the second information when the an interference judgment unit for judging whether the self is in a state of radio wave interference based on the radio wave intensity; and receiving the first information from another wireless device when the interference judgment unit judges that the self is in the state of radio wave interference. channel switching information is added to the second information, or channel switching information is transmitted instead of the second information, not only to the transmission source of the first information, but also to the surroundings when the transmission source of the first information is specified. 3 communication unit, and a channel switching unit that switches its own channel after the channel switching information is transmitted by the third communication unit.

According to the present invention, the information required to be transmitted is transmitted/received through the transmission/reception of the first information and the second information, and when it is determined that there is radio wave interference, when the first information is received from another wireless device. Since the channel switching information is transmitted in addition to or instead of the second information, the channel switching information is transmitted in the same manner as when transmitting and receiving normal information. You can suppress the transformation.

Also, when transmitting and receiving the first information and the second information, normally the transmission source of the first information is specified and the second information is transmitted. Channel switch information is transmitted in addition to or instead of the second information without specification. Therefore, the channel switching information is received not only by the wireless device that transmitted the first information, but also by other wireless devices in the vicinity. Therefore, it is possible to collectively switch the channels of the surrounding wireless devices, and it is possible to change the communication channel of the entire network more quickly.

Therefore, it is possible to provide a wireless system and a wireless device capable of suppressing the complication of the configuration and changing the communication channel of the entire network more quickly.

1 is a configuration diagram showing a radio system according to an embodiment of the present invention; FIG. 2 is a functional block diagram showing the configuration of each of a plurality of wireless devices shown in FIG. 1; FIG. 4 is a conceptual diagram showing how information is transmitted and received by a first communication unit; FIG. 4 is a conceptual diagram showing how information is transmitted and received by a first communication unit and a second communication unit; FIG. FIG. 2 is a conceptual diagram showing how information is transmitted and received in a state of radio wave interference; FIG. 2 is a conceptual diagram showing how information is transmitted and received by a wireless device that has received channel switching information from a wireless device that is in a state of radio wave interference. FIG. 10 is a conceptual diagram showing how information is transmitted and received when the second determination unit determines a radio wave interference state; FIG. 11 is a conceptual diagram showing channel switching by a wireless device that constitutes a wireless system according to a second embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below along with preferred embodiments. It should be noted that the present invention is not limited to the embodiments described below, and can be modified as appropriate without departing from the gist of the present invention. In addition, in the embodiments shown below, there are places where illustrations and explanations of some configurations are omitted, but the details of the omitted technologies are provided within the scope that does not cause contradiction with the contents explained below. , Needless to say, well-known or well-known techniques are applied as appropriate.

FIG. 1 is a configuration diagram showing a radio system according to an embodiment of the present invention. As shown in FIG. 1, a wireless system 1 according to the present embodiment includes a plurality of connection devices M, a plurality of wireless devices WD, and a center side device CA.

A plurality of connection devices M are gas meters, gas alarms, etc., and are connected to each wireless device WD by wire, for example. These connected devices M transmit information to the center side apparatus CA through a plurality of wireless devices WD, and receive information from the center side apparatus CA through a plurality of wireless devices WD. The information transmitted from the connected device M to the center-side device CA includes, for example, meter reading information and failure information of gas meters, alarm information and failure information of gas alarms, and the like. The information received from the center-side device CA corresponds to, for example, information for opening and closing the shutoff valve of the gas meter, voice information output from the gas alarm, and the like.

A plurality of wireless devices WD are capable of wirelessly transmitting and receiving information to and from other wireless devices WD in a network configured with a plurality of wireless devices WD. A plurality of radios WD has a specific radio WD1. A specific wireless device WD1 is capable of transmitting and receiving information to and from the center side device CA through a line according to communication standards such as LTE (Long Term Evolution).

Further, among the plurality of wireless devices WD, the non-specific wireless device WD2 excluding the specific wireless device WD1 can transmit and receive information to and from the center apparatus CA via the specific wireless device WD1. More specifically, for example, the first wireless device WD21 transmits and receives information to and from the center device CA only through the specified wireless device WD1 without having another non-specified wireless device WD2. The second wireless device WD22 transmits and receives information to and from the specific wireless device WD1 via the first wireless device WD21, and transmits and receives information to and from the center apparatus CA via the specific wireless device WD1. Further, the third radio device WD23 transmits and receives information to and from the specific radio device WD1 via the first radio device WD21 and the second radio device WD22, and transmits and receives information to and from the center side device CA through the specific radio device WD1. Send and receive.

FIG. 2 is a functional block diagram showing the configuration of each of the multiple wireless devices WD shown in FIG. As shown in FIG. 2, each wireless device WD includes an input unit 10, an output unit 20, a communication unit 30, a first determination unit (interference determination unit) 40, a second determination unit (second interference determination unit ) 50 and a channel switching unit 60 .

The input unit 10 inputs information to be transmitted to the center-side device CA (see FIG. 1) from the connected device M (see FIG. 1). When the information is input by the input unit 10, the wireless device WD determines that there is information to be transmitted. Further, the wireless device WD determines that there is information required to be transmitted even when information required to be transmitted is sent from another wireless device WD.

The output unit 20 outputs the information transmitted from the center-side device CA to the connected equipment M to be connected. The connection device M receives information from the output unit 20 of the wireless device WD and executes control according to the received information.

The communication unit 30 is a functional unit that performs wireless communication with another wireless device WD. The communication section 30 includes a first communication section 31 , a second communication section 32 , a third communication section 33 , a fourth communication section 34 and a fifth communication section 35 .

The first communication unit 31 transmits "RIT Data Request" (first information) to surroundings. This "RIT Data Request" is beacon information for the wireless device WD to notify other wireless devices WD of its own existence. When the first communication unit 31 of the wireless device WD transmits "RIT Data Request", the wireless device WD enters a short reception state (short reception state). Further, when the wireless device WD receives the "RIT Data Request" from another wireless device WD by radio, it can recognize that communication with the other wireless device WD is possible.

FIG. 3 is a conceptual diagram showing how information is transmitted and received by the first communication unit 31. As shown in FIG. In FIG. 3, the radio device A, which is one of the plurality of radio devices WD, and the radio device B, which is the other one, will be described as an example. The first communication unit 31 (see FIG. 2) of the wireless device A transmits "RIT Data Request" at specific intervals. Also, as shown in FIG. 3, the first communication unit 31 of the wireless device A enters the short reception state after transmitting the "RIT Data Request". This short reception state is a state of waiting for a reply to the "RIT Data Request" ("RIT Data Response" to be described later). In this manner, the wireless device A periodically transmits the "RIT Data Request" through the first communication unit 31, and enters the short reception state each time the transmission is performed.

The same is true for radio B. That is, the wireless device B periodically transmits "RIT Data Request" through the first communication unit 31, and enters the short reception state each time the transmission is performed.

Refer to FIG. 2 again. When the second communication unit 32 receives "RIT Data Request" from another wireless device WD, the second communication unit 32 sends a reply when it owns information to be transmitted. At this time, the second communication unit 32 specifies the transmission source of the "RIT Data Request" and returns the "RIT Data Response" (second information) as an SREQ (transmission request). In particular, when the second communication unit 32 receives "RIT Data Request" from another wireless device WD while it owns transmission-required information, the second communication unit 32, while the other wireless device WD is in the short reception state Reply quickly so that the "RIT Data Response" reaches you.

FIG. 4 is a conceptual diagram showing how information is transmitted and received by the first communication unit 31 and the second communication unit 32. As shown in FIG. In FIG. 4 as well, the wireless device A and the wireless device B will be described as an example. As described with reference to FIG. 3, the radios A and B periodically transmit "RIT Data Request" and enter the short receive state each time they transmit. Here, it is assumed that the wireless device B has transmission information to be transmitted to the wireless device A. FIG. In this case, the first communication unit 31 (see FIG. 2) of the wireless device B stops periodic transmission of the "RIT Data Request" and enters a reception state waiting for the "RIT Data Request" from the wireless device A.

Next, when radio B receives "RIT Data Request" from radio A, it quickly transmits "RIT Data Response" to radio A (while radio A is in the short reception state). . Then, the radio A receives the "RIT Data Response" from the radio B.

In this way, when the radio device A is in the short reception state, the radio device B transmits the "RIT Data Response", and the radio device A receives the "RIT Data Response". ) is established.

Refer to FIG. 2 again. As shown in FIG. 2, the second communication section 32 includes first to third functional sections 32a to 32c. After the one-to-one communication is established as described above, the second communication unit 32 transmits and receives information between the wireless devices WD using the first to third functional units 32a to 32c.

When receiving the "RIT Data Response" from the other wireless device WD, the first functional unit 32a requests the other wireless device WD, which is the transmission source of the "RIT Data Response", for information to be transmitted. It transmits "RACK" (request information).

When receiving "RACK" from another wireless device WD, the second function unit 32b transmits "DATA", which is information to be transmitted, to the other wireless device WD that is the transmission source of "RACK". It is something to do.

When the third function unit 32c receives "DATA (information to be transmitted)" from another wireless device WD, the third function unit 32c sends "DACK" (confirmation) to the other wireless device WD that is the source of the information to be transmitted. information).

Please refer to FIG. 4 again. As described above, the "RIT Data Response" is transmitted from the wireless device B when the wireless device A is in the short reception state, and received by the wireless device A, thereby establishing one-to-one communication between the two. After that, the first function unit 32a of the wireless device A designates the wireless device B and transmits "RACK". When the second function unit 32b of the wireless device B receives "RACK", it designates the wireless device A and transmits "DATA". Next, when receiving "DATA", the third function unit 32c of the wireless device A designates the wireless device B and transmits "DACK".

As described above, the required transmission information of the wireless device B is transmitted to the wireless device A as shown in FIG. After that, the wireless device A transmits the required transmission information to the specified wireless device WD1 via the other non-specified wireless device WD2. When the specific wireless device WD1 receives the information to be transmitted, it transmits the information to be transmitted to the center side apparatus CA via a base station or the like.

Refer to FIG. 2 again. The first determination unit 40 determines whether it is in an interference state based on the radio wave intensity of the channel currently in use (performs so-called carrier sense). Here, depending on the surrounding environment, the radio device WD as described above may be in a state of radio wave interference that makes it difficult to transmit and receive information. Therefore, the first determination unit 40 determines whether or not there is radio wave interference based on whether the surrounding radio wave intensity is equal to or greater than a predetermined value.

Here, the determination by the first determination unit 40 is preferably made at the time of information transmission. Specifically, when the first communication unit 31 transmits the “RIT Data Request”, the wireless device WD determines whether there is radio wave interference based on the radio wave intensity of the channel currently in use. The first determination unit 40 also determines whether there is radio wave interference when information is transmitted by the first function unit 32a to the third function unit 32c.

When the first determination unit 40 determines that there is radio wave interference, information transmission by the first communication unit 31 and the first to third function units 32a to 32c is prohibited.

Here, in such a state of radio wave interference, it is necessary to switch the channel currently in use, and it is preferable to quickly switch the channel throughout the network. However, providing a dedicated device for switching causes a complicated configuration. Therefore, the wireless system 1 according to this embodiment includes the third communication unit 33 and the fourth communication unit 34 in order to perform channel switching using the information transmission/reception method shown in FIG.

The third communication unit 33 shown in FIG. 2, when it is determined by the first determination unit 40 that its own wireless device WD is in a state of radio wave interference, for example, when the radio wave interference weakens by chance and the other wireless device WD " RIT Data Request" is received, channel switching information is transmitted. At this time, the third communication unit 33 adds the channel switching information to the "RIT Data Response" and transmits it to the surroundings without designating the other party as the transmission source.

More specifically, when there is no radio wave interference, the second communication unit 32 designates the other party as the source of the "RIT Data Request" and transmits the "RIT Data Response". On the other hand, if there is radio wave interference, the third communication unit 33 adds channel switching information to the "RIT Data Response" and transmits it to the surroundings without designating the other party as the transmission source.

As a result, the channel switching information can be transmitted to other wireless devices WD located within a communicable distance from the own wireless device WD (that is, other than the source of the "RIT Data Request").

FIG. 5 is a conceptual diagram showing how information is transmitted and received in a state of radio wave interference. In FIG. 5 as well, the wireless device A and the wireless device B will be described as an example. First, the first communication unit 31 (see FIG. 2) of the wireless device A periodically transmits "RIT Data Request", and the first determination unit 40 (see FIG. 2) of the wireless device B detects its own radio wave interference. Suppose that it is determined that the state is

If there is radio wave interference, basically radio B cannot receive the "RIT Data Request" from radio A. Data Request" can be received.

In a state where the first determination unit 40 determines that there is radio wave interference, when "RIT Data Request" is received from the wireless device A, the third communication unit 33 (see FIG. 2) of the wireless device B sends the wireless device A Channel switching information is added to the "RIT Data Response" and transmitted in time for the short reception state. In particular, the third communication unit 33 does not perform so-called unicasting, but transmits channel switching information to the surroundings by broadcasting or multicasting. As a result, the channel switching information is received by many surrounding wireless devices WD.

In this case, information is not transmitted and received by the first to third functional units 32a to 32c (see FIG. 2). , communication may be performed by the first function unit 32a to the third function unit 32c.

Please refer to FIG. 2 again. The channel switching unit 60 switches the channel of its own wireless device WD after the channel switching information is transmitted by the third communication unit 33 . In this embodiment, for example, two communication channels are available for communication, and the channel switching unit 60 switches the currently used channel to the other channel.

Furthermore, the wireless device WD according to the present embodiment uses the fourth communication unit 34 to quickly switch channels within the network. The fourth communication unit 34 transmits the channel switching information to the surroundings when the channel switching information is received from another wireless device WD. In this embodiment, it is assumed that the fourth communication unit 34 transmits channel switching information in accordance with transmission of "DATA".

FIG. 6 is a conceptual diagram showing how information is transmitted and received by the wireless device WD that has received channel switching information from the wireless device WD in a state of radio wave interference. In FIG. 6, a wireless device A that has received channel switching information and another wireless device C will be described as an example.

First, assume that radio A receives channel switching information from radio B as described with reference to FIG. Assume that the wireless device A has information to be transmitted. In this case, the wireless device A responds to the "RIT Data Request" from the wireless device C with a "RIT Data Response". Next, when the wireless device A receives "RACK" from the wireless device C, the wireless device A returns information to be transmitted (DATA). At this time, the fourth communication unit 34 (see FIG. 2) of the wireless device A adds the channel switching information to the transmission required information and transmits the information. In addition, the fourth communication unit 34 broadcasts or multicasts this transmission required information to the surroundings. As a result, the channel switching information is also received by the surrounding wireless devices WD other than the wireless device C. FIG. It should be noted that the surrounding wireless devices WD other than the wireless device C do not require the information to be transmitted and may be discarded. You may make it transmit to WD. When the radio device C receives the information to be transmitted and the channel switching information, it processes the upper side radio device WD (the center side radio device WD) and the like in the same manner as the radio device A shown in FIG. to run.

Next, the wireless device A receives "DACK" from the wireless device C after adding the channel switching information to the required transmission information and transmitting it. The channel switching unit 60 of the wireless device A switches the channel after confirming the reception of "DACK".

In addition, in the example shown in FIG. 6, the channel switching information is transmitted together with "DATA", but it is not limited to this. For example, when "RIT Data Request" is received from another wireless device WD (not limited to wireless device C), the channel switching information may be broadcast or multicast together with "RIT Data Response". As a result, even if the wireless device WD does not have the required transmission information, the channel switching information can be spread around.

In addition, in the example shown in FIG. 6, the information shown in FIG. 6 is transmitted and received when the wireless device A has the channel switching information and the information to be transmitted. The transmission and reception of the information shown in FIG. 6 may be performed when there is information and there is no information to be transmitted. In this case, the wireless device A broadcasts or multicasts only the channel switching information without transmitting "DATA".

Refer to FIG. 2 again. Further, the wireless system 1 according to the present embodiment not only allows the wireless device WD to determine its own radio wave interference state by the first determination unit 40, but also includes the second determination unit 50, and the second determination unit 50 It is possible to determine that the wireless device WD is in a state of radio wave interference.

In more detail, the second determination unit 50 receives "RIT Data Response" from another wireless device WD and transmits "RACK", but cannot receive "DATA" (when there is no reply). ), it is determined that another wireless device WD is in a state of radio wave interference.

Further, the wireless device WD according to the present embodiment includes a fifth communication unit 35. When the second determination unit 50 determines the state of radio wave interference from another wireless device WD, the fifth communication unit 35 performs channel switching. Send information around. At this time, when the fifth communication unit 35 receives the "RIT Data Request" from the wireless device WD other than itself, it adds the channel switching information to the "RIT Data Response" and performs broadcast transmission or multicast transmission to send it to the surroundings. Channel switching information is transmitted.

FIG. 7 is a conceptual diagram showing how information is transmitted and received when the second determination unit 50 determines the state of radio wave interference. In FIG. 7 as well, the wireless device A and the wireless device B will be described as an example.

First, the wireless device A periodically transmits "RIT Data Request" and enters the short reception state each time it transmits. Here, it is assumed that the wireless device B has transmission information to be transmitted to the wireless device A. FIG. In this case, when the radio B receives the "RIT Data Request" from the radio A, it transmits the "RIT Data Response" while the radio A is in the short receive state. Thereafter, radio A transmits "RACK" to radio B.

Next, assume that radio B receives "RACK" and transmits "DATA" to radio A, but radio A does not receive "DATA". At this time, the second determination unit 50 of the wireless device A determines that the wireless device B is in a state of radio wave interference.

After that, it is assumed that "RIT Data Request" is received from a wireless device WD other than itself (or wireless device B). Accordingly, the fifth communication unit 35 of the wireless device A adds the channel switching information to the "RIT Data Response" and performs broadcast transmission or multicast transmission to transmit the channel switching information to surroundings. As a result, the wireless device A can determine the radio wave interference state of the wireless device B and transmit channel switching information to the surroundings.

Next, the operation of the wireless system 1 according to this embodiment will be described. First, each wireless device WD shown in FIG. 1 periodically transmits "RIT Data Request" as shown in FIG. Here, for example, it is assumed that the gas alarm (connected device M) connected to the third wireless device WD23 detects a gas leak and issues an alarm. In this case, the input unit 10 of the third wireless device WD23 inputs the alarm information as the information to be transmitted. Then, as shown in FIG. 4, the third radio device WD23 is in a reception state waiting for "RIT Data Request" from the second radio device WD22, which is a host device, in order to transmit information to be transmitted to the center device CA. Become.

Next, when the third radio device WD23 receives the "RIT Data Request" from the second radio device WD22, the first communication unit 31 of the third radio device WD23 is in time for the short reception state of the second radio device WD22. It returns "RIT Data Response" as follows. After that, the first functional unit 32a of the second wireless device WD22 transmits "RACK" specifying the third wireless device WD23, and the second functional unit 32b of the third wireless device WD23 transmits "DATA" to the second wireless device WD23. Designate WD22 and transmit. Next, the third functional unit 32c of the second wireless device WD22 transmits "DACK" specifying the third wireless device WD23. As a result, the alarm information of the third wireless device WD23 ("DATA" and information to be transmitted) is transmitted to the second wireless device WD22.

Thereafter, the second wireless device WD22 performs communication similar to that of the first wireless device WD21 and transmits alarm information to the first wireless device WD21, and the first wireless device WD21 performs communication similar to that of the specific wireless device WD1. to transmit the alarm information to the specific wireless device WD1. A specific wireless device WD1 transmits alarm information to the center side device CA via a base station or the like according to a communication standard such as LTE.

Also, upon receiving such alarm information, the center-side device CA, for example, closes the shutoff valve of the gas meter (connected device M) connected to the second wireless device WD22. to send cut-off information (“DATA” and information that needs to be sent).

The specific wireless device WD1 transmits cutoff information to the second wireless device WD22 via the first wireless device WD21 in the same manner as described above. The second wireless device WD22 that has received the cutoff information transmits the cutoff information to the gas meter through the output unit 20 . This causes the gas meter to close its shutoff valve.

In the process of transmitting and receiving such information, for example, even though the second wireless device WD22 has transmitted "RACK" to the first wireless device WD21, "DATA" is not returned. In this case, as shown in FIG. 7, the second determination unit 50 of the second wireless device WD22 determines that the first wireless device WD21, which is the other party of the unicast communication, is in a state of radio wave interference.

Then, it is assumed that the second radio device WD22 receives "RIT Data Request" from another radio device WD. At this time, the fifth communication unit 35 of the second wireless device WD22 adds the channel switching information to the "RIT Data Response" and performs broadcast transmission or multicast transmission to transmit the channel switching information to surroundings. As a result, the channel switching information is transmitted not only to the first wireless device WD21, which was the communication partner of the second wireless device WD22, but also to the surrounding wireless devices WD. Note that the channel switching unit 60 of the second wireless device WD22 switches channels after transmitting the channel switching information.

Further, apart from the transmission/reception process of the information to be transmitted, the first determination unit 40 of each wireless device WD determines whether it is in a state of radio wave interference. Here, it is assumed that the first determination unit 40 of the second wireless device WD22 determines that it is in a state of radio wave interference. In this case, the second wireless device WD22 adds the channel switching information to the "RIT Data Response" when the radio wave interference weakens temporarily and the "RIT Data Request" from the other wireless device WD can be received. , broadcast transmission or multicast transmission is performed to transmit channel switching information to surroundings. As a result, for example, the channel switching information is received by the first radio device WD21 and the third radio device WD23 that are present near the second radio device WD22. Note that the channel switching unit 60 of the second wireless device WD22 switches channels after transmitting the channel switching information.

After receiving the channel switching information, the first wireless device WD 21 becomes in a state of holding the channel switching information, and receives transmission required information from another wireless device WD or inputs required transmission information from the connected device M through the input unit 10. In this case, the information shown in FIG. 6 is transmitted and received. That is, the first wireless device WD21 receives, for example, "RIT Data Request" from the specific wireless device WD1 and returns "RIT Data Response". Next, when "RACK" is received from the specific wireless device WD1, the fourth communication unit 34 adds channel switching information to "DATA" and performs broadcast communication or multicast communication. As a result, the channel switching information is received not only by the specific wireless device WD1, but also by other nearby wireless devices WD. Note that the channel switching unit 60 of the first wireless device WD21 switches channels after transmitting the channel switching information.

In this manner, according to the wireless system 1 and the wireless device WD according to the present embodiment, transmission/reception of information required to be transmitted is performed through transmission/reception of "RIT Data Request" and "RIT Data Response", and it is determined that there is radio wave interference. If so, when receiving the "RIT Data Request" from the other wireless device WD, channel switching information is transmitted in addition to or in place of the "RIT Data Response". The channel switching information is transmitted in the same manner as in the above, and complication of the configuration such as when another device is provided can be suppressed.

Also, when sending and receiving "RIT Data Request" and "RIT Data Response", normally, the sender of "RIT Data Request" is specified and "RIT Data Response" is sent, but there is radio wave interference. Sometimes channel switching information is sent in addition to the "RIT Data Response" without specifying the source of the "RIT Data Request". Therefore, the channel switching information is received not only by the wireless device WD that is the transmission source of the "RIT Data Request" but also by other nearby wireless devices WD. Therefore, the channel switching of the surrounding wireless devices WD can be collectively performed, and the communication channel of the entire network can be changed more quickly.

Therefore, it is possible to provide the wireless system 1 that can suppress the complication of the configuration and change the communication channel of the entire network more quickly.

Further, when the wireless device WD receives channel switching information from another wireless device WD, it transmits the channel switching information to its surroundings and switches the channel of its own wireless device WD after transmission. Not only the WD but also the wireless device WD that received the channel switching information from the wireless device WD can transmit the channel switching information to the surroundings, and the communication channel of the entire network can be changed more quickly.

In addition, when "RIT Data Response" is received from another wireless device WD, even though "RACK" requesting a reply of transmission required information (DATA) is sent to the other wireless device WD, the other wireless device WD If there is no reply of the required transmission information from the wireless device WD, it is determined that the other wireless device WD is in a state of radio wave interference. If reception, transmission of "RACK", and reception of "DATA" should continue, but "DATA" cannot be received, it can be said that the other wireless device WD has suddenly become in a state of radio wave interference. Therefore, when "DATA" cannot be received, it is determined that another wireless device WD is in a state of radio wave interference, and channel switching information can be transmitted from the wireless devices WD surrounding the wireless device WD in the state of radio wave interference.

Next, a second embodiment of the invention will be described. The radio system according to the second embodiment is the same as that of the first embodiment, but the contents of some processing are different.

FIG. 8 is a conceptual diagram showing channel switching by the wireless device WD that constitutes the wireless system 1 according to the second embodiment. Note that, in FIG. 8, the wireless devices A to C, which are one of the plurality of wireless devices WD, will be described as an example. It is assumed that wireless device B is in a state of radio wave interference. The bars extending from the radios A to C shown in FIG. 8 are white and black, and the white indicates the channel before switching, and the black indicates the channel after switching.

First, assume that the first determination unit 40 of the wireless device B determines that itself is in a state of radio wave interference. As a result, the third communication unit 33 of the wireless device B adds the channel switching information to the "RIT Data Response" and performs broadcast transmission or multicast transmission in the same manner as the method described with reference to FIG. The wireless device B that has transmitted the channel switching information switches channels.

The fourth communication unit 34 of the wireless device A that has received the channel switching information adds the channel switching information to "DATA" and performs broadcast transmission or multicast transmission in the same manner as the method described with reference to FIG. 6, for example. The wireless device A that has transmitted the channel switching information switches channels. Furthermore, in the second embodiment, the fourth communication unit 34 of the wireless device A broadcasts or multicasts the channel switching information again on the channel after switching after the channel switching. That is, when receiving channel switching information from another wireless device WD, the fourth communication unit 34 transmits the channel switching information to the surroundings through two channels before and after the channel switching.

Here, as shown in FIG. 8, it is assumed that the channel switching information transmitted on the channel before switching did not reach the wireless device C due to an accidental deterioration of the radio wave environment. In this case, since the channel is not switched, the wireless device C cannot receive the channel switching information transmitted on the channel after switching, and the wireless device C may be isolated without the channel switching. There is

Therefore, in the present embodiment, the third communication unit 33 of the wireless device B performs a recovery process of transmitting channel switching information again on the two channels before and after the channel switching after switching its own channel by the channel switching unit 60. . As a result, it is possible to retransmit channel switching information to the wireless device WD, such as the wireless device C, which is in an isolated state without being switched channels, using the channel before switching.

Even if the channel switching information does not reach directly from the wireless device B to the isolated wireless device WD, channel switching to the wireless device C via the wireless device A is performed as shown in FIG. information can be reached. That is, as described above, when receiving the channel switching information, the fourth communication section 34 of the wireless device A transmits the channel switching information on two channels before and after switching. Therefore, when the channel switching information is received by the recovery processing of the wireless device B, the channel switching information is broadcast or multicast transmitted from the wireless device A on the two channels before and after the switching, and the wireless device C in the isolated state receives the channel switching information. can receive the channel switching information on the channel before switching.

As described above, in the wireless system 1 according to the second embodiment, the channel switching information is broadcast or multicast for the wireless device WD that is determined by the first determination unit 40 to be in a state of radio wave interference. Even after switching, the channel switching information is broadcast or multicast again on the two channels before and after the switching by recovery processing.

Moreover, in the wireless system 1 according to the second embodiment, the wireless device WD that has received the channel switching information broadcasts or multicasts the channel switching information on two channels before and after switching. Therefore, even when the channel switching information is received by the recovery process, the channel switching information is broadcast-transmitted or multicast-transmitted on the two channels before and after the switching to spread the channel switching information on the two channels. . As a result, the channels of all wireless devices WD in the network are quickly switched so that no wireless device WD is isolated.

Thus, according to the wireless system 1 and the wireless device WD according to the second embodiment, the same effects as those of the first embodiment can be obtained.

Furthermore, according to the second embodiment, since the third communication unit 34 executes the recovery process, the channel switching information is transmitted again to the wireless device WD which is in an isolated state without being able to receive the channel switching information. Therefore, switching of communication channels in the entire network can be performed more reliably.

In addition, regarding the wireless device WD that has received the channel switching information, since the fourth communication unit 34 transmits the channel switching information to the surroundings in two channels before and after the switching, the wireless device WD in the isolated state receives the channel switching information by the recovery process. , the wireless device WD that has received the channel switching information relays the information, so that the communication channel can be switched more reliably.

As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments, and may be modified without departing from the scope of the present invention. You may combine well-known techniques.

For example, in the above embodiment, the channel switching information is added to "RIT Data Response" or added to "DATA" and transmitted. It may be transmitted instead.

Further, the connection device M connected to the wireless device WD may not be one, but a plurality of connection devices M may be connected to one wireless device WD. Also, the wireless device WD and the connection device M may be wired or wirelessly connected.

In addition, the first determination unit 40 according to the present embodiment may determine the radio wave interference state when the surrounding radio wave intensity for the current channel is continuously equal to or greater than a predetermined value for a predetermined number of times.

1: wireless system 10: input unit 20: output unit 30: communication unit 31: first communication unit 32: second communication unit 32a: first function unit 32b: second function unit 32c: third function unit 33: third Communication unit 34: fourth communication unit 35: fifth communication unit 40: first determination unit (interference determination unit)
50: Second judgment unit (second interference judgment unit)
60: Channel switching unit CA: Center side device M: Connection device WD: Radio device WD1: Specific radio device WD2: Non-specific radio device

Claims (6)

information can be transmitted and received in a network configured by a plurality of wireless devices, and a specific wireless device among the plurality of wireless devices can transmit and receive information to and from a center side; For non-specified radio equipment excluding the above-mentioned specific radio equipment, information is transmitted and received with the above-mentioned specific radio equipment via other non-specified radio equipment or without via other non-specified radio equipment, and through the above-mentioned specific radio equipment A wireless system for transmitting and receiving information to and from a center,
The radio is
a first communication unit that transmits the first information to surroundings;
When the first information is received from another wireless device and there is information to be transmitted to the transmission source of the first information, the transmission source of the first information is specified and the second information is transmitted. , thereafter, a second communication unit that transmits and receives information to and from the transmission source of the first information;
an interference judgment unit for judging whether or not the device is in a state of radio wave interference based on the radio wave intensity of the channel currently in use;
When the interference judging unit judges that the radio wave interference state is present, when the first information is received from another wireless device, the radio wave is directed to the surroundings instead of specifying only the transmission source of the first information. , a third communication unit that adds channel switching information to the second information or transmits channel switching information instead of the second information;
a channel switching unit that switches its own channel after transmitting channel switching information by the third communication unit;
A radio system comprising: The wireless device further includes a fourth communication unit that transmits channel switching information to surroundings when channel switching information is received from another wireless device,
The wireless system according to claim 1, wherein the channel switching unit switches its own channel after transmitting the channel switching information by the fourth communication unit. 3. The third communication unit according to claim 2, wherein, after switching its own channel by the channel switching unit, the third communication unit performs a recovery process of transmitting channel switching information again on two channels before and after the channel switching. radio system. 4. The fourth communication unit, when receiving channel switching information from another wireless device, transmits the channel switching information to surroundings through two channels before and after channel switching. A radio system as described. The radio is
When the second information is received from another wireless device, the transmission-required information is transmitted from the other wireless device even though request information requesting a reply of the transmission-required information is transmitted to the other wireless device. a second interference determination unit that determines that the other wireless device is in a state of radio wave interference when there is no reply from
When the second interference determination unit determines that the other wireless device is in a state of radio wave interference, when the first information is received from the wireless device other than the self, only the wireless device other than the self is designated. A fifth communication unit that adds channel switching information to the second information and transmits it toward the surroundings instead of
5. The radio system according to any one of claims 1 to 4, further comprising: a first communication unit that transmits the first information to surroundings;
When the first information is received from another wireless device and there is information to be transmitted to the transmission source of the first information, the transmission source of the first information is specified and the second information is transmitted. , thereafter, a second communication unit that transmits and receives information to and from the transmission source of the first information;
an interference judgment unit for judging whether or not the device is in a state of radio wave interference based on the radio wave intensity of the channel currently in use;
When the interference judgment unit judges that the radio wave interference state is present, when the first information is received from another radio device, the radio wave is directed to the surroundings instead of specifying only the transmission source of the first information. , a third communication unit that adds channel switching information to the second information or transmits channel switching information instead of the second information;
a channel switching unit that switches its own channel after transmitting channel switching information by the third communication unit;
A wireless device comprising:

Images