JP2002223188A - Radio wave remote controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave remote controller that can prevent collision of relay signals even when repeaters transmit a signal with the same frequency after the reception of a data frame and changes an upper limit code of a queuing time for frequency depending on kinds of transmitted information so as to transmit a radio signal proper to a request for information transmission. SOLUTION: The radio wave remote controller is provided with a hierarchical setting section 14 that sets and stress a layer of its own station and transmits a data frame including the upper limit code denoting an upper limit of a relay wait time by at least carrier sense, a relay hierarchical code denoting relay layers through which the radio signal passes, an identification code specific to communication equipment, and a frame number as the radio signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital wireless communication, and more particularly, to a digital wireless communication system in which a communication area is extended using a repeater.

[0002]

2. Description of the Related Art A weak radio and a low power radio do not require a license, and are widely used for remote monitoring and remote control of various facilities and for security applications. However, while no license is required, antenna power is restricted by laws and regulations, so that a few meters to several tens of meters for weak radio and several tens of meters for low power radio.
Only a communication distance of m to several hundred meters can be obtained. Therefore, a repeater can be used to extend the communication area. Since the data to be transmitted for the above purpose is digitized and transmitted intermittently as a predetermined data frame, the repeater receives and accumulates the data frame, and after completing the reception of the data frame, has the same frequency as the communication device. Can be relayed. With such a configuration, there is an advantage that the repeater can be installed without any special measures for the receiver. However, when two or more repeaters are installed, a plurality of repeaters transmit at the same frequency after receiving a data frame, so that a collision between the relay signals occurs, and the receiver cannot receive the relay signals. Even if the repeater has a function of carrier sensing, collision between relay signals cannot be avoided because carrier sensing is performed at the same time to determine a frequency vacancy.

In a conventional repeater, a plurality of repeaters perform carrier sense at the same time by setting a CST, which is a fixed upper limit of the relay wait time, in the repeater and shifting the time until carrier sense is started. This prevents collisions between relay signals. However, since this repeater has a fixed CST, it can be used for relay transmission in a short time, that is, when it is used for remote control that requires responsiveness, and when it is desired to transmit wireless signals reliably even if it takes time. That is, since the CST cannot be changed depending on the type of information such as when used for security purposes, the same repeater cannot be shared for remote control purposes and security purposes.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide an upper limit code, which is an upper limit of a relay waiting time by carrier sense, in a data frame. , Each repeater calculates a relay waiting time until performing carrier sense based on the upper limit code, and after receiving the data frame, shifts the time at which the repeater relays and transmits, so that relaying is performed. The collision between signals can be prevented, and the relay waiting time can be freely changed according to the type of information to be transmitted.

[0005]

To achieve the above object, a radio remote controller according to the present invention has the following arrangement. That is, according to the first aspect of the present invention, there is provided a communication device that transmits a radio signal via a plurality of repeaters, the communication device includes a layer setting unit that sets and stores a layer of its own station,
A data frame including an upper limit code that is the upper limit of the relay waiting time due to carrier sense, a relay layer code indicating a relay layer through which the wireless signal has passed, an identification code unique to the communication device, and a frame number is transmitted as a wireless signal. It is characterized by doing.

According to a second aspect of the present invention, there is provided a repeater for relaying and transmitting a radio signal, comprising a layer setting unit for setting and storing a relay layer which is a layer of the own station, wherein a data frame transmitted as a radio signal comprises: At least, an upper limit code that is an upper limit of a relay waiting time by carrier sense, a relay layer code indicating a relay layer through which the data frame has passed, an identification code unique to a communication device that is the source of the data frame, and the data A frame number unique to a frame, and the control unit calculates the relay waiting time using the relay layer, the relay layer code, and the upper limit code, and receives the data frame. Carrier sense is performed after the relay waiting time has elapsed from the time, and the carrier sense is performed immediately when the frequency to be used is available, and the carrier sense is performed when the used frequency is not available. The relay layer code is rewritten to the relay layer at the point of time when it is continuously changed to empty, the data frame is relay-transmitted, and the frequency is not empty during a time corresponding to the upper limit code from the reception time. In this case, the data frame is discarded.

In the invention according to claim 3, the repeater has the same identification code and the same frame number with respect to the received first data frame before the relay waiting time elapses, and When a second data frame whose hierarchical code is larger than the first data frame is received, the relay layer code of the second data frame, the relay layer, and the upper limit code are used again to perform the relaying. It is characterized in that the waiting time is calculated.

According to a fourth aspect of the present invention, when the upper limit code included in the received data frame is a specific value, the repeater does not relay the data frame.

In the invention according to claim 5, the communication apparatus uses the maximum value of the relay layers assigned to the plurality of repeaters, the relay layer code, and the upper limit code to perform relay waiting by carrier sense. A time is calculated, and carrier sensing is prohibited from the reception time of the data frame until the relay waiting time elapses.

According to a sixth aspect of the present invention, the communication device according to the first aspect, the repeater according to any one of the second to fourth aspects, and the communication device according to the fifth aspect, Wireless communication system.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. One embodiment of a radio remote controller according to the present invention will be described below with reference to FIG. In the present embodiment, as shown in FIG. 1A, a wireless system including a transmitter 20A as a communication device and a relay 10A, a relay 10B, a receiver 30, or a transceiver 40 will be described below. Will be described. Communication between the transmitter 20A and the repeaters 10A and 10B and between the relays 10A and 10B and the receiver 30 can be performed.
0A and the receiver 30 and between the repeaters 10A and 10B.
It is assumed that communication cannot be performed between the two due to spatial distance or radio wave attenuation due to obstacles.

Here, the communication device and the repeater will be described. As shown in FIG. 2A, the repeater 10 includes a transmitting unit 11 for transmitting a wireless signal and a receiving unit 1 for receiving a wireless signal.
5, a layer setting unit 14 for setting and storing the relay layer of the repeater 10 of its own station, and a storage unit 16 composed of ROM / RAM and storing received data frames, programs, and the like.
The control unit 12 extracts necessary information from the storage unit, calculates the relay waiting time of the repeater 10, and rewrites the relay layer code in the data frame to its own relay layer.
And In the present embodiment, the hierarchy setting unit 14
A dip switch (not shown) is used as a means for setting the relay layer in the above.

Further, as shown in FIG.
0 is a transmission unit 11 for transmitting a radio signal, a layer setting unit 14 for setting and storing a layer of its own station by a dip switch (not shown), like the repeater 10, a ROM / R
A storage unit 26 configured to store an identification code unique to the own station; a storage unit 26;
And a control unit 21 configured to acquire necessary information from a predetermined data frame according to a predetermined data frame format.

With respect to the setting of the CST shown in FIG. 3, a rotary switch 24 is provided on the housing surface (not shown) of the transmitter 20, and the control unit 21 of the transmitter 20 reads the set value of the rotary switch 24. By setting a value to the CST of the data frame and transmitting the data, the user of the transmitter 20 can arbitrarily set the CST. The rotary switch 24 changes the numerical value output to the control unit 21 by rotating the rotary unit, and the control unit 21 reads the value of the rotary unit and sets it as CST.

As shown in FIG. 2C, the receiver 3
Reference numeral 0 denotes a receiving unit 15 for receiving a radio signal, and a layer setting unit 14 for setting and storing a layer of its own station by a dip switch (not shown), similarly to the repeater 10.
A storage unit 36 configured to store a received data frame, a program, and the like constituted by a RAM, and control for extracting necessary information from the storage unit 36 and transmitting the received data to an external equipment, for example, the information processing terminal 33. Part 31;
It has. The transmitter / receiver 40 includes the transmitting unit 11 having a function of transmitting a wireless signal in the receiver 30.

Next, the configuration of a data frame transmitted and received in the wireless communication system will be described. As shown in FIG. 3, a preamble (hereinafter, P
R), which is used for bit synchronization when the repeater 10 and the transceiver 40 receive a data frame. Next, there is a unique word (hereinafter, UW) which is a predetermined data pattern, and the receiving side of the data frame uses UW to perform frame synchronization. Next, there is a frame control (hereinafter, FC) that determines a frame control method. The FC is composed of a plurality of blocks, and includes a relay layer code (hereinafter, HOP), an upper limit code (hereinafter, CS), which is an upper limit of the time for continuing carrier sense.
T) is included. Next to the FC composed of such blocks, an individual identification code (hereinafter, referred to as ID) of a transmission source, a frame number (hereinafter, referred to as FN) which is a unique value for each frame, and a byte counter (hereinafter, referred to as FN) indicating a frame length Hereafter, BC), transmission data (hereinafter, DAT)
A) and an error detection code (hereinafter, CRC). Among those described above, the repeater 10
Is only HOP that can be rewritten. Also, the FN starts from 0 for each transmitter 20 and is incremented by one every data frame transmission, and is an upper limit of 2 (k−) determined by the number k of bits allocated to the FN.
1) When it reaches the power, it returns to 0.

Also, for example, 2 bits are assigned to CST, and CST = 1 second for "01" and CST = 1 second for "10".
Transmitter 2 is set to 2 seconds and "11" so that CST = 3 seconds.
By programming 0 and the control microcomputer of the repeater 10, the upper limit value of the idle waiting time of the frequency by the carrier sense of the repeater 10 can be controlled by the code specified in the CST. Here, when the CST is “00”, it is programmed in the control unit 12 of the repeater 10 so that the received frame is discarded without being relayed.
Relaying can be prohibited.

Here, a calculation formula used for calculating the idle waiting time is shown. The idle waiting time is determined by the CS of the data frame.
T and HOP = m, using the relay layer n of the own station, (n−m
-1) × (CST + frame length).

Here, the repeater 10 in which the number of relay layers is n will be described in detail with reference to the flowchart shown in FIG. When the repeater 10 starts receiving a data frame (step S1), the control unit 12 detects bit synchronization using PR (step S2). When the bit synchronization is detected, the control unit 12 receives the data frame (step S3). Then, it is stored in the storage unit 16. If bit synchronization cannot be detected, step S2 is repeated until bit synchronization can be detected again.

After the reception of the data frame is completed, whether or not the data frame has been relayed before is checked using the ID of the relayed data frame stored in the storage unit 16 and the FN (step S1). S4). If the data frame is a relayed data frame, the data frame is discarded (step S17).

If the data frame is not relayed,
HOP of data frame stored from storage unit 16 =
m is compared with its own relay layer n (step S5),
If HOP = m is larger than the relay layer n, the control unit 12 calculates the relay waiting time represented by (nm-1) × (CST + frame length). In this case, m> n
Therefore, the timer provided in the control unit 12 is reset and the timer count is started in order to immediately perform the relay operation without setting the relay waiting time (step S13).
It operates according to the flow after step S13.

If m> n, the timer is reset and the timer starts counting (step S6). The control unit 12 compares the timer count value with the relay waiting time calculated from the data frame (Step S
7) If the timer count value is longer than the relay wait time,
The process proceeds to step S13 to perform the relay operation. Conversely, if the timer count value has not reached the relay waiting time, bit synchronization is detected using the PR of another data frame to receive another data frame other than the data frame (step S8). Here, if the bit synchronization cannot be detected, the process returns to step S7 where the relay wait time and the timer count are compared again. If bit synchronization can be detected, a new data frame is received (step S9). It is determined whether the newly received data frame matches the data frame waiting for relay (step S10). If they do not match, the process returns to step S7 for comparing the relay waiting time with the timer count again. If they match, the HOP = m of the data frame and the HOP =
m ′ (step S11), and HOP = m ′ is H
If OP = m, that is, if m ′> m, the process proceeds to step S13 for performing the relay operation. Conversely, HO
If P = m ′ is smaller than HOP = m, and m ′ <m,
The relay wait time is recalculated with m == m ', and based on this, the process proceeds to step S7 in which the relay wait time is compared with the timer count value.

Next, step S1 for performing the relay operation
The following 3 will be described. First, a timer is reset to perform carrier sensing, and timer counting is started (step S13). Next, carrier sense is actually performed (step S14) to check for a vacant frequency. The timer count value is compared with the CST (step 16). If not confirmed, the data frame is discarded (step S17). If a free frequency is confirmed before the timer count value reaches CST, a relay operation is performed and a data frame is transmitted (step S1).
5). Next, the data frame ID and the FN are stored in the relay history (step S18). The above is a description of the repeater 10
Operation.

Next, the operation of the wireless system according to an example of the combination of the transmitter 20, the repeater 10, and the transceiver 40 will be described. Hereinafter, as a combination example of the configuration of the wireless system, a wireless system having one transmitter, two relays, and one receiver shown in FIG. As an example 2, in the wireless system with two transmitters, two relays and one receiver shown in FIG. 5, the interference signal transmitted from the transmitter 20B is CST.
If shorter than. As an example 3, the transmitter 2 shown in FIG.
One, two repeaters and one receiver in a wireless system,
When the interference signal transmitted from the transmitter 20B is longer than the CST. As an example 4, as shown in FIG.
In addition, signals can be exchanged between repeaters in a single receiver wireless system. As Example 5, a wireless system with two transceivers and two relays shown in FIG. 8 will be described. Note that the value of the HOP is set to 0 in the transmitter 20, the receiver 30, and the transceiver 40. In the repeater 10A, 1
In the repeater 10B, 2 is set by a dip switch.

First, with reference to FIG. 1, the operation of the wireless system of the first combination example in the present embodiment will be described.
As shown in FIG. 1B, the transmitter 20A starts transmission of a data frame at time T1, and ends transmission at time T3. That is, the value obtained by subtracting the time T1 from the time T2,
(T2-T1) is the data frame length.

Next, referring to the flow of FIG.
The operation timing of the wireless system in Example 1 shown in (b) will be described. When receiving the data frame from the transmitter 1 (step S1), the repeater 10A refers to the HOP of the data frame and compares it with the relay layer of its own station (step S5). In this case, since the HOP is 0, which is smaller than the relay layer 1 of the own station, the relay preparation operation is performed (step S13). The relay waiting time at this time is (1-0-
1) × (CST + frame length) = 0, the carrier sense is immediately performed without any relay waiting time (step S14), the HOP of the data frame is rewritten to the relay layer 1, and the data frame is relayed and transmitted. (Step S
15) At time T3, the relay transmission is completed.

Since the repeater 10B has received from the transmitter 20A (step S1), the HOP of the received data frame is 0, which is smaller than the relay layer 2 of its own station.
The relay operation starts (step S13), and the relay waiting time at this time is (2-0-1) × (CST + frame length) =
(CST + frame length). Therefore, carrier sense is performed from T4 (CST + frame length) after the data frame reception completion time T2 (step S14),
The HOP of the data frame is rewritten to the relay layer 2 and relayed and transmitted (step S15).

Receiver 30 receives the data frame from repeater 10A at time T2, and completes the reception at time T3. Further, the data frame from the repeater 10B is received at time T4, and the reception is completed at time T5. In this case, since the receiver 30 receives the same data frame, it leaves only the first received data frame, and discards all subsequently received data frames with different values of the same HOP. is there.

As described above, the time at which the repeater starts carrier sensing is shifted for each repeater, and the upper limit is also set for the time at which carrier sense is performed. Becomes one, and it is possible to prevent a collision of relay signals performed after carrier sensing.

Next, the wireless system of combination example 2 is
This will be described with reference to FIG. As shown in FIG. 5A, in the present embodiment, a transmitter 20A and a transmitter 20B,
0A, a repeater 10B, and a receiver 30. As shown in FIG. 5B, the transmitter 20A
Starts transmission of a data frame at time T1, and starts transmission at time T2.
Complete the transmission. Further, transmitter 20B starts transmitting the interference signal at time T2 and ends transmission at time T3. At this time, since HOP = 0 and relay layer = 1, the repeater 10
In A, the relay waiting time becomes (1-0-1) × (CST + data frame length) = 0 (step S7), and the transmission is immediately started at the reception completion time T2 without any relay waiting time. Is the same frequency that the interference signal of the transmitter 20B is going to use for transmission, so the repeater 10A
Determines that transmission is impossible as a result of performing the carrier sense operation (step S14). Therefore, carrier sense is continued until CST, and when a frequency to be used becomes available,
Transmission is started (step S15). When the transmission of the transmitter 20B is completed at the time T3, the repeater 10A starts the relay transmission (Step S15) since the repeater 10A confirms the frequency vacancy by the carrier sense (Step S14).
Complete the transmission. Further, the repeater 10B is connected to the transmitter 20A.
From the reception completion time (2-0-1)
If carrier sense is performed at time T5 when (CST + data frame length) = (CST + data frame length) has elapsed (step S14), an empty frequency can be confirmed, and data frame transmission is started at time T5 (step S14). S15). As described above, the time at which the repeater starts the carrier sense is shifted for each repeater, and the time for performing the carrier sense is also set to the upper limit value, so that only one repeater performs the carrier sense at the same time. In addition, it is possible to prevent relay signal collision after carrier sense.

Next, a third combination example of the wireless system will be described with reference to FIG. As shown in FIG. 6A, a wireless system including a transmitter 20A and a transmitter 20B, a repeater 10A, a repeater 10B, and a receiver 30 will be described. The transmitter 20B transmits an interference signal. As shown in FIG. 6B, the transmitter 1 that has started transmitting the data frame at time T1 completes the transmission at time T2. Transmitter 2 starts transmitting the interference signal at time T2 and ends at time T4. Since the relay waiting time becomes (1-0-1) × (CST + frame length) = 0 (step S7), the repeater 10A immediately performs the carrier sense without setting the relay waiting time. Since the transmission of 20B is confirmed, carrier sense is continued (step S1).
4). Therefore, the carrier sense is continued from time T2 to time T3 after the elapse of the CST. At time T3, however, no empty frequency is detected by the carrier sense, so that the relay 10A discards the data frame (step S3). S17), the relay operation is completed. Further, the repeater 10B receives the signal reception completion time T from the transmitter 20A.
At time T5 when the relay waiting time (2-0-1) × (CST + data frame length) = (CST + data frame length) elapses from step 2 (step S7), the carrier sense operation is performed (step S14), and the frequency becomes empty. Can be confirmed, the transmission of the data frame is started at time T5 (step S15), and the transmission is completed at time T6. Next, a fourth combination example of the wireless system will be described with reference to FIG. As shown in FIG. 7A, the transmitter 20A
A wireless system composed of the relay device 10A, the relay device 10B, and the receiver 30 will be described. In this wireless system, the repeaters 10A and 10B can communicate with each other. As shown in FIG. 7B, the transmitter 20A that has started transmitting the data frame at time T1 completes the transmission at time T2. The relay waiting time of the repeater 10A is (1-
Since 0-1) × (CST + frame length) = 0 (step S7), carrier sensing is immediately performed at the data frame reception completion time T2 without setting a relay wait time (step S14). At this time, when it is confirmed that the frequency is empty, the transmission of the data frame is immediately started (step S15). The relay 1 that has started transmission at time T2 completes transmission at time T3. Repeater 10B receives the signal from transmitter 20A at time T1 (step S1), and completes the reception at time T2. Here, repeater 10B receives a signal from repeater 10B at time T2 (step S2).
1) Reception is completed at time T3. Therefore, at time T2, the relay waiting time is calculated (step S7). The relay waiting time is (2-0-1) × (CST + frame length) = (CST + frame length). However, at time T
3. In the same frame as the relay waiting frame,
= 1, the relay waiting time is (2
-1-1) × (CST + frame length) = 0, carrier sense is immediately started (step S14), and relay transmission is performed (step S15).

Next, a fifth combination example of the wireless system will be described with reference to FIG. As shown in FIG. 8A, a transceiver 40A, a transceiver 40B, a repeater 10A,
A wireless communication system including the repeater 10B will be described. The transceiver 40A and the transceiver 40B can communicate with each other, and the D of the data frame of the transceiver 40A
The program is set so that the transceiver 40B can return a reply according to the code of the ATA section. FIG.
As shown in (b), the transmitter / receiver 40A that has started transmitting the data frame at time T1 completes the transmission at time T2. The repeater 10A completes the reception at time T2 (step S1), immediately performs the carrier sense without the relay waiting time (step S5) (step S14), and confirms the free frequency. When it is confirmed that a frequency is available, transmission of the data frame is started immediately (step S15), and transmission is completed at time T3. The repeater 10B completes the reception of the signal from the transmitter 1 at the time T2, but since the relay waiting time is (CST + data frame length) (step S7), the time T after the relay waiting time elapses from the time T2.
4 starts carrier sense (step S14), and when a free frequency is confirmed, transmission starts (step S14).
15), transmission is completed at time T5.

The transmitter / receiver 40B switches the repeater 10 at time T2.
And completes the reception at time T3. The relay waiting time of the transceiver 40B is (maximum relay layer−HO
Since (P) × (CST + data frame length), in this case, (2-1) × (CST + data frame length). This indicates the maximum time from the reception time of the data frame to the last transmission / reception of the data frame being relayed. Since the same data frame as that currently held by the transceiver is not transmitted, the relay signals do not collide with each other.

That is, the transceiver 40B that has received the signal from the repeater 10B at time T4 completes the reception at time T5. The data frame received here is transmitted to the repeater 10
Since the data frame coincides with the data frame received from A, the time until the transmitter / receiver 40B transmits a signal is (2-1) ×
(CST + data frame length) = (CST + data frame length), the signal is received from the repeater 10A at time T2, and the signal starts to be transmitted at time T5 after (CST + data frame length) has elapsed from this time.

As described above, a signal transmitted by one transmitter 20 is received by a plurality of repeaters 10 by assigning a relay layer number to the repeaters 10. At this time, by using the relay layer number and the HOP in the transmitted data frame, each of the relays 10 shifts the time at which the relay operation is started, thereby preventing collision between relay signals. Becomes possible.

In a wireless system including the transmitter 20, the repeater 10, and the receiver 30 as a communication partner, when the transmitter 20 is used to remotely control the equipment 33 connected to the receiver 30, Is to reduce the value of CST. By doing so, the relay waiting time is shortened, so that a signal is transmitted earlier to the equipment 33 on the receiver 30 side with respect to the input of the transmitter 20. Also, the transmitter 20
If the device connected to the device is a security device such as a smoke sensor or a vibration sensor, it is necessary to reliably sound the alarm device or the like which is the facility device 33 connected to the receiver 30. Increase the value.
By doing so, the relay waiting time becomes longer, and even if there is a long-term interference signal, relay transmission can be performed more reliably.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to this embodiment but can be implemented in various forms.

[0038]

According to the radio remote controller according to the first aspect of the present invention, it is possible to set and transmit an upper limit code for setting an arbitrary relay waiting time according to the type of information to be transmitted. A repeater can be shared for control and security purposes.

According to the second aspect of the present invention, the data frame is transmitted when the frequency vacancy is confirmed by the carrier sense, and if there is no frequency vacancy between the upper limit codes, the data frame is discarded. Therefore, the relay device can perform the relay operation of another data frame without holding the one data frame forever.

According to the third aspect of the present invention, when a new data frame having a relay layer code larger than the relay layer code of the data frame currently held by the repeater is received, the newly received data frame The relay waiting time can be reduced by resetting the time at which carrier sense is started using the relay hierarchical code.

According to the fourth aspect of the present invention, if a specific code is described in the data block for setting the CST in the data frame, it is possible to eliminate the need for the relay device to perform the relay transmission. Does not occur, it is possible to prevent the relay signals from colliding with each other.

According to the fifth aspect of the present invention, the time from when the transceiver receives the radio signal to when the radio signal is transmitted is calculated using the largest one of the relay layers assigned to the repeater. Therefore, when the transceiver transmits a wireless signal, the same wireless signal as the received wireless signal is not relayed by the repeater, so that it is possible to prevent the relay signals from colliding with each other.

According to the sixth aspect of the present invention, it is possible to construct a wireless system capable of preventing collision between relay signals.

[Brief description of the drawings]

FIG. 1 is a diagram showing a combination example 1 of a wireless system according to an embodiment of the present invention;

FIG. 2 shows a transmitter according to an embodiment of the present invention;
It is a block diagram of a repeater and a transceiver.

FIG. 3 is a diagram showing a flowchart of a repeater in one embodiment according to the present invention;

FIG. 4 is a diagram showing a configuration of a data frame according to one embodiment of the present invention;

FIG. 5 is a diagram showing a combination example 2 of the wireless system in one embodiment according to the present invention;

FIG. 6 is a diagram showing a combination example 3 of the wireless system in one embodiment according to the present invention;

FIG. 7 is a diagram showing a combination example 4 of the wireless system in one embodiment according to the present invention;

FIG. 8 is a diagram showing a fifth combination example of the wireless system in one embodiment according to the present invention;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 repeater 10A repeater 10B repeater 11 transmitting unit 12 control unit 14 hierarchical storage unit 15 receiving unit 16 storage unit 20 transmitter 20A transmitter 20B transmitter 21 control unit 23 sensor 26 storage unit 30 receiver 30A receiver 30B reception Container 31 Control unit 33 External equipment 36 Storage unit

Claims (6)

[Claims] 1. A communication device for transmitting a radio signal via a plurality of repeaters, the communication device comprising a layer setting unit for setting and storing a layer of its own station, and at least a relay waiting time by carrier sense. A data frame including an upper limit code that is an upper limit of the above, a relay layer code indicating a relay layer through which the wireless signal has passed, an identification code unique to the communication device, and a frame number is transmitted as a wireless signal. Communication device. 2. A repeater for relaying and transmitting a radio signal,
A data frame transmitted as a radio signal includes at least an upper limit code, which is an upper limit of a relay waiting time by carrier sense, and a data frame passing the data frame. A relay layer code indicating the relay layer, and an identification code unique to the communication device that is the source of the data frame, and a frame number unique to the data frame, and the control unit includes the relay layer, Using the relay layer code and the upper limit code, the relay wait time is calculated, and carrier sense is performed after the relay wait time elapses from the reception time of the data frame. Immediately rewrites the relay layer code to the relay layer when it is not vacant and when carrier sensing is continued and changes to vacant. The data frame relayed, when the frequency during the elapsed time corresponding from the reception time to the upper limit code is not empty, the relay, characterized in that discarding the data frame. 3. The relay device according to claim 1, wherein the relay device has the same identification code and the same frame number with respect to the received first data frame before the relay waiting time elapses, and the relay layer code is the same as the relay layer code. When a second data frame larger than one data frame is received, the relay waiting time is calculated again using the relay layer code, the relay layer, and the upper limit code of the second data frame. The repeater according to claim 2, wherein the relay is performed. 4. The apparatus according to claim 1, wherein the relay does not relay the data frame when the upper limit code included in the received data frame is a specific value. A repeater as described in Crab. 5. The communication apparatus calculates a relay waiting time by carrier sense using a maximum value among relay layers assigned to a plurality of repeaters, the relay layer code, and the upper limit value code, 2. The communication apparatus according to claim 1, wherein carrier sensing is prohibited from a reception time of the data frame to a lapse of the relay wait time. 6. A wireless communication system comprising: the communication device according to claim 1; the repeater according to any one of claims 2 to 4; and the communication device according to claim 5.