JPH07321708A - Frequency hopping radio communication method - Google Patents

Abstract

PURPOSE:To prevent deterioration in communication quality due to a disturbing radio wave and deterioration in communication quality due to collision of operating frequency bands. CONSTITUTION:A controller detects an electric field strength in excess of a carrier sense level CL from each radio master station to receive band numbers (fX1, f2,...fXy) in which a disturbing wave is in existence (ST12), extracts hopping codes C11,...,C21,..., ...C81,... used to avoid a band number in each zone and stores them (ST13). Then a hopping code whose hopping frequency band is not in duplicate based on an extracted hopping code of each zone (ST14). The extracted code is allocated to each zone in this way (ST15). The controller informs the hopping code allocated to each radio master station to it (ST16). Each radio master station starts radio communication by using the hopping code allocated to each communication zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency hopping wireless communication method applied to, for example, a frequency hopping spread spectrum wireless communication system.

[0002]

2. Description of the Related Art As a communication method of a direct sequence spread spectrum wireless communication system, for example, Japanese Patent Publication No. 58-5 is available.
A method disclosed in Japanese Patent No. 6290 is known. In this method, a spreading code (code) group used in a certain wireless service area is assigned to another area where there is no problem of radio wave interference with the area and is repeatedly used. For example, as shown in FIG. 16, the spreading code groups used in the wireless zones Z11 to Z14 in the area A1 are far away from the area A1 in the wireless zone Z21 to the area A2 so that radio wave interference does not pose a problem. It is assigned to Z24 and used.

As a communication method of a frequency hopping spread spectrum communication system, for example, a method disclosed in Japanese Patent Laid-Open No. 4-313926 is known. In this method, as shown in FIG. 17, receivers 1a and 1b for radio wave condition monitoring are provided separately from transceivers 2a and 2b for communication to constantly monitor the radio wave condition, and when the frequency condition deteriorates. Is to change to another communication channel.

[0004]

[Problems to be Solved by the Invention] Japanese Patent Publication Sho 58-5629
No. 0 publication, for example, wireless zones Z12 to Z14 and Z
21 to Z23 are spread codes C12 to C14 and C21 to C, respectively.
Suppose that 23 is assigned and the same spreading code C11 is assigned to the wireless zones Z11 and Z24.

The idea of assigning the same spreading code to another area where there is no problem of radio interference is based on the DS (Direct Seq
uence: Direct spread) spread spectrum communication F
The same can be applied to H (Frequency Hopping) type spread spectrum communication.

For example, a spreading code C11 having a frequency band of 6 → 19 → 23 → 27 → 6 is used, and a spreading code C12 having a frequency band of 1 → 9 → 18 → 24 → 1 is used. , Spreading code C13 whose frequency band repeats 7 → 11 → 25 → 28 → 7 is used, spreading code C14 uses frequency band repeating 2 → 5 → 13 → 17 → 2, and spreading code C21 As for the frequency band, which is repeated as 12 → 16 → 21 → 26 → 12,
The spread code C22 has a frequency band of 3 → 8 → 14 → 22 →
3 and a spreading code C23 whose frequency band is 4 → 10 → 15 → 20 → 4 is used.

FIG. 18 shows this. In the figure, all the used frequency bands are shown, but at a certain moment, only one frequency band is used in each zone.

If there is an interfering radio wave in each zone as shown in the figure in such a frequency usage situation,
In the zone Z11, the hopping frequency band is 6,1.
Since it is 9, 23, and 27, communication can be performed while avoiding the frequency bands 4 and 13 in which the jamming radio wave D exists, so that it is not affected by the jamming radio wave. On the other hand, in zone Z24, the same spreading code as zone Z11 is used, but the frequency band in which the jamming radio wave exists is different. Therefore, jamming radio wave D
When hopping to the frequency band 19 in which is present, the influence of the jamming radio wave D affects the communication quality.

That is, in Japanese Patent Publication No. 58-56290, a spread code is assigned to a zone regardless of whether there is an interfering radio wave and in which frequency band the interfering radio wave exists. Therefore, there is a problem in that a spread code that intentionally uses the frequency band in which the jamming radio wave exists is assigned, resulting in deterioration of communication quality.

Further, in Japanese Patent Laid-Open No. 4-313926, in a system having a plurality of wireless communication zones, there may occur a problem that radio waves transmitted from each other collide with each other.

For example, as shown in FIG. 19, zones Z1 ...
There are three wireless communication zones Z3, Z1 and Z1.
If the radio wave of the allocated frequency f2 happens not to be transmitted during the radio wave condition monitoring time of 3 (hopping time slot 1), it is said that both the radios in the zones Z1 and Z3 have a good frequency condition (vacant) of the frequency f2. judge.

Therefore, when the radios in the zones Z1 and Z3 both enter the hopping time slot 2 and transmission data is generated, the radio waves start to be transmitted, so that the radios in the zone Z1 and the radio in the zone Z3. However, there is a problem in that the communication collides with each other and normal communication cannot be performed. In particular, as shown in the figure, when the radio waves are started to be transmitted in the zones Z1 and Z3 substantially at the same time, there is a problem that such a communication collision cannot be avoided at all.

Therefore, the present invention provides a frequency hopping wireless communication method capable of preventing deterioration of communication quality due to interference radio waves and deterioration of communication quality due to collision of used frequency bands.

[0014]

The invention according to claim 1 is
In each of the plurality of wireless communication zones, the electric field strength of each of a plurality of pre-allocated frequency bands is sequentially monitored to store the frequency band that affects communication in the wireless communication zone of the own station, and then the stored frequency band A hopping code that avoids is extracted, and a hopping code that avoids using the same frequency band between the wireless communication zones is selected from the extracted hopping codes and assigned to each wireless communication zone.

According to the second aspect of the present invention, in each of the plurality of wireless communication zones, the electric field strength of each of a plurality of frequency bands assigned in advance is sequentially monitored to affect the communication in the wireless communication zone of the own station. A frequency band is stored, and then a hopping code that avoids the stored frequency band is extracted, and from this extracted hopping code, a hopping code to be used in each wireless communication zone is assigned, and a hopping code to be used in a certain wireless communication zone, Allocating to another wireless communication zone that does not interfere with the wireless communication zone.

According to the third aspect of the invention, in each of the plurality of wireless communication zones, the electric field strength of each of a plurality of frequency bands previously assigned is sequentially monitored to affect the communication in the wireless communication zone of the own station. A frequency band is stored, and then a hopping code that avoids the stored frequency band is extracted. If there is no hopping code that avoids the same frequency band between the wireless communication zones in the extracted hopping code, it is extracted. A hopping code including the same frequency band is selected from the hopping codes, and the selected hopping code is assigned to each wireless communication zone so that the distance between the zones using the selected hopping code is maximized. .

According to a fourth aspect of the invention, in each of the plurality of wireless communication zones, the electric field strength of each of a plurality of frequency bands assigned in advance is sequentially monitored to affect the communication in the wireless communication zone of the own station. A frequency band is stored, and then a hopping code that avoids the stored frequency band is extracted. If there is no hopping code that avoids the same frequency band between the wireless communication zones in the extracted hopping code, it is extracted. A hopping code that minimizes the use of the same frequency band is selected from the hopping codes and assigned to each wireless communication zone.

[0018]

According to the first aspect of the invention, frequency hopping is avoided by using a frequency band in which an interfering radio wave that affects the communication of its own station exists, and is used in each wireless communication zone. The hopping frequency bands work so as not to overlap each other.

In the invention according to claim 2, frequency hopping is avoided by using a frequency band in which an interfering radio wave that affects the communication of the own station exists, and furthermore, radio wave interference with a corresponding radio communication zone is avoided. The function of assigning the same hopping code as that of the corresponding wireless communication zone to another wireless communication zone that is far away from the wireless communication zone does not occur. Therefore, the same hopping code is used in a plurality of wireless communication zones, but these wireless communication zones are in a state of being separated from each other by a distance that does not cause a radio wave interference problem.

In the invention corresponding to claim 3, frequency hopping is avoided by using a frequency band in which an interfering radio wave affecting the communication of the own station exists, but such an interference is caused in each radio communication zone. When allocating a hopping code that avoids radio waves, if the hop radio frequency band overlaps between wireless zones, the hopping code with overlapping frequency bands should be assigned to the wireless communication zone with the longest communication distance. To work.

In the invention according to claim 4, frequency hopping is avoided by using a frequency band in which an interfering radio wave affecting the communication of the own station exists, but such an interference is caused in each radio communication zone. When a hopping code that avoids radio waves is assigned, when the hop radio frequency bands overlap between the radio zones, the combination of hopping codes that minimizes the overlapping frequency bands acts to be selected.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a diagram showing the configuration of a frequency hopping radio communication system. In the figure, Z1 to Z8 indicate radio communication zones, zones Z5 to Z8 are on the first floor of a building, and zones Z1 to Z4 are. Formed on the second floor of the building.

One wireless master station M1 to M8 is installed in each of the wireless communication zones Z1 to Z8. These wireless master stations M1 to M8 are communication cables 200
It is connected to the control device 100 via.

Further, in each of the wireless communication zones Z1 to Z8, six wireless slave stations S11 to S16, S21 to S26, S that perform wireless communication with the wireless master stations M1 to M8, respectively.
31-S36, S41-S46, S51-S56, S6
1-S66, S71-S76, S81-S86 are installed.

The radio master stations M1 to M8 provide various information to the control device 100 via the communication cable 200, and conversely, the control device 100 causes the radio master stations M to M8.
1 to M8 are instructed via the communication cable 200 regarding wireless communication.

The radio master stations M1 to M8 and the radio slave stations S11 to S16, S21 to S26, S31 to S36, S
41-S46, S51-S56, S61-S66, S7
The circuit configuration of 1 to S76 and S81 to S86 is as shown in FIG.

That is, the radio wave received by the antenna 1 is input to the mixer 5 via the duplexer (DPX) 2, the RF (radio frequency) amplifier 3, and the bandpass filter 4.

The mixer 5 mixes the frequency signal from the local oscillator 6 with the received signal, and sends the mixed signal to a detector 9 and a carrier detector 10 via a bandpass filter 7 and an IF (intermediate frequency) amplifier 8. We are supplying each.

The detector 9 detects an input signal, and the detected signal is passed through a low pass filter 11 to a binarization circuit 12
Is being supplied to. The binarization circuit 12 binarizes the input signal and outputs it as reception data RXD.

The carrier detector 10 detects the carrier of an input signal, converts the detected signal into a digital signal through an A / D (analog / digital) converter 13, and then supplies the digital signal to the control circuit 14. .

Further, the transmission data TXD is modulated by the modulator 15 and then input to the mixer 17 via the IF amplifier 16. The mixer 17 mixes the input transmission signal with the frequency signal from the local oscillator 18, and mixes the mixed signal with a bandpass filter 19 and a PW (power) amplifier 20.
Is supplied to the duplexer (DPX) 2 via the antenna 1 and is wirelessly transmitted from the duplexer 2 via the antenna 1.

The control circuit 14 controls the set frequencies of the local oscillators 6 and 18 according to an instruction of a control program written in the memory 14a. That is, the radio transmission / reception frequency can be changed by changing the set frequency of each of the local oscillators 6 and 18. By changing the transmission / reception frequency with time according to the spread code, a frequency hopping radio device can be configured.

Reference numeral 21 is an interface circuit for wired communication. The interface circuit 21 is necessarily incorporated in the wireless master station, but is not necessarily incorporated in the wireless slave station.

By the method of controlling the control circuit 14,
The control that characterizes the present invention can be realized. For example, it is assumed that frequency bands 1 to 28 are allocated with a bandwidth fw as shown in FIG. 3 as frequency bands that can be used in the present system. The radio device used in this system is affected by the communication of its own station when an interfering radio wave D having an electric field strength of CL or more is present (error occurs in received data).
I shall.

The strength of the received radio wave is determined by the carrier detector 1
0 is obtained as a voltage signal representing the received electric field strength,
This is converted into a digital signal by the A / D converter 13 and input to the control circuit 14.

The level CL (carrier sense level) affected by the communication of the own station is stored in the memory 14a in advance. Thereby, the control circuit 14 compares the output of the carrier detector 10 with the carrier sense level CL,
Before actually performing communication, it is determined whether communication in that frequency band is okay.

Control circuit 14 of each of the radio master stations M1 to M8
The memory 14a stores a program for performing control based on the flow shown in FIG.

Control circuit 14 of each of the radio master stations M1 to M8
First, the frequency band number n is set to "1" in ST1. Then, in ST2, the electric field strength of the frequency band number n is measured. If the electric field strength exceeds the carrier sense level CL, the band number n at that time is stored in the memory 1 in ST3.
Store in 4a.

The above processing is repeated until the frequency band number n becomes 28, and when the frequency band number n is 28, that is, when all the frequency bands have been checked, at ST4, the wireless zone number Zm to which the own station belongs is identified. Band number (fx1, f) that detected the electric field strength exceeding the carrier sense level CL
x2, ... fxy) is notified to the control device 100.

For example, in the case of using the frequencies shown in FIG. 3, the frequency bands exceeding the carrier sense level CL in each of the wireless communication zones Z1 to Z8 are as shown in Table 1.

[0042]

[Table 1] In this state, the system waits for reception of the notification of the hopping code from the control device 100, and if there is the reception, the frequency hopping code used in ST5 is set to the received hopping code.

The controller is programmed to control according to the flow chart of FIG. First, ST
At 11, the wireless master station number n is set to "1". Then ST
At 12, the band number (fx1, fx2, ... fxy) where the interference wave exists in the wireless communication zone Zn is notified from the wireless master station Mn of the zone Zn.

Then, in ST13, the band numbers (fx1, fx2,
.. fxy) for avoiding hopping codes Cn1, Cn2, ... Are extracted and stored.

The above processing is repeated until the radio master station number n becomes "8". In this way, all wireless master stations M1 ~
Band number (fx1, fx2,
Hopping codes C11, C12, ..., C for avoiding (fxy)
21, C22, ..., C81, C82, ... Are extracted and stored.

For example, as shown in Table 2, C1 to C1
It is assumed that 0 kinds of hopping codes can be used.
The numbers in the table indicate frequency band numbers, for example, "1.
If there is 6 → 21 → 26 ”, then“ 26 ”is followed by“ 16 ”
To return to.

[0047]

[Table 2] By using the hopping codes C1 to C10, the hopping codes that avoid the frequency band in which the interference wave exists in each zone are shown in Table 3.

[0048]

[Table 3] When the extraction of the hopping code is completed, the control device 100 shifts to the processing of the portion surrounded by the alternate long and short dash line in the flowchart of FIG.

That is, hopping codes C11, C12, ..., C21, C22, ..., C of each zone extracted in ST14.
From 81, C82, ..., Hopping codes whose hopping frequency bands do not overlap are extracted.

As can be seen from Table 2 above, the hopping codes C5, C9 and C10 all use the frequency band "19" and thus overlap. Therefore, if C9 and C10 are excluded, usable hopping codes are C1 to C8.

The code extracted in ST15 is assigned to each zone. That is, the allocation of the hopping code to each zone is as shown in Table 4.

[0052]

[Table 4] The control device 100 uses the communication cable 200 in ST16.
The hopping code assigned to each of the radio master stations M1 to M8 is notified via the.

Receiving this notification, each of the wireless master stations M1 to M8 starts wireless communication with the hopping code assigned in each of the wireless communication zones Z1 to Z8. FIG. 6 shows the arrangement of spectrums after communication has started. However, FIG. 6 shows a spectrum when the spectrum is observed for a time longer than the time of one hopping cycle.

Therefore, for example, in the wireless communication zone Z1, the signals of the frequency band numbers "16", "21" and "26" are not always transmitted at the same time, and at any one moment, one of the three Indicates that radio waves are being transmitted to only one band.

Then, the used frequency band is changed in accordance with the hopping sequence of the hopping code shown in Table 2.

According to this method, each wireless communication zone Z1
It is possible to avoid the interfering radio waves respectively present in Z8 to Z8 and to perform communication between the wireless communication zones without overlapping the frequency bands used.

Therefore, it is necessary to prevent the transmission quality of the communication from being deteriorated by the interfering wave, or it is possible to prevent the transmission quality of the communication from being deteriorated due to the collision of the used frequency bands in the system.

By changing the control method of the control device 100, control different from that of the first embodiment can be realized.

Next, another embodiment of the present invention will be described with reference to the drawings. The frequency hopping wireless communication system is the same as that in FIG. 1, and the configurations of each wireless master station and each wireless slave station are also the same as in FIG.

Second Embodiment The control device 100 performs control based on the flowcharts of FIGS. 7 to 9 instead of the control based on the flowchart of FIG.

The flowchart of FIG. 7 is the same as that of FIG. 5 except for the control of the portion surrounded by the one-dot chain line in the flowchart of FIG.

That is, the band numbers (fx1, fx2, ... fx) in which the interference wave exists for all the radio master stations M1 to M8.
hopping codes C11, C12, ..., C21, which avoid y)
When C22, ..., C81, C82, ... are extracted and stored, ST
Hopping codes C11, C12 for each zone extracted in 21
From C21, C22, ..., C81, C82, ..., the hopping code in which the hopping frequency bands do not overlap is the number of zones,
That is, it is checked whether there are only eight.

If there is the number of zones, then in ST22, it is checked whether or not there are communication zones which do not have the problem of radio wave interference with each other. If there are no communication zones having no problem of radio wave interference with each other, at this time, as shown in FIG. 8, the same control as that of the part surrounded by the one-dot chain line in the flowchart of FIG. 5, that is, ST14, ST15 , ST16 based on the processing.

Further, in ST21, when there are no zones of hopping codes whose hopping frequency bands do not overlap,
If there is a communication zone where there is no problem of radio wave interference with each other at 22, control is performed based on the flowchart of FIG.

That is, in ST23, the extracted hopping codes are redundantly assigned to the communication zones having no radio interference problem. Then, in ST24, allocations to the remaining zones are determined from the remaining hopping codes excluding the overlappingly allocated hopping codes.

Finally, in ST25, the hopping code assigned to the radio master station of each zone is notified.

For example, if an interfering radio wave D as shown in FIG. 3 is emitted, and there are only seven types of hopping codes C11 to C71 that can be used for this, as shown in Table 5, in this case, This is less than eight zones.

[0068]

[Table 5] In this case, since the frequency band in which the interference wave is emitted is the same as that in Table 1, the hopping code for avoiding the interference wave in each zone is as shown in Table 6.

[0069]

[Table 6] When the control device 100 finishes the extraction of the hopping code in Table 6, it checks ST21. Since there are only seven hopping codes in which the hopping frequency bands do not overlap, the processing based on the flowchart of FIG. 9 is performed in this case.

The control device 100 arranges the radio communication zones Z1 to Z8, the distance between the radio communication zones, and the range of radio devices (radio master station and radio slave station) in each radio communication zone. Information such as whether interference may occur is stored in advance.

In the case of FIG. 1, the zones Z1 and Z8 and the zones Z4 and Z5 are the farthest apart, and if they are located between these zones, radio waves of the same frequency are used to communicate with each other. It is assumed that information that does not affect internal communication is stored in the control device 100. Such information can be stored in the control device 100 by conducting a preliminary investigation before starting the operation of the system.

Zones Z1 and Z8 and zones Z4 and Z5
Since it is not necessary to worry about radio wave interference even if they are assigned the same frequency, it is assumed that the same frequency is assigned to the zones Z1 and Z8, for example. Table 7 shows the allocation of the hopping code to each zone.

[0073]

[Table 7] The control device 100 notifies the radio master stations M1 to M8 of the allocation of Table 7 via the communication cable 200, and the radio master stations M1 to M8 start hopping in the zones Z1 to Z8 and start communication. To do.

FIG. 12 shows the arrangement of spectrums after the start of communication. That is, also in this case, the jamming radio waves D existing in each zone are avoided.

Therefore, even if such control is performed, it is possible to prevent the transmission quality of communication from being deteriorated by the interfering wave. Further, since the same hopping code is used in the zones Z1 and Z8, the used frequency bands overlap, but the zone Z1
Since Z and Z8 are so far apart from each other that they do not interfere with each other, they do not affect each other's communication and deteriorate communication quality.

As described above, also in this embodiment, the same effect as that of the first embodiment can be obtained.

Third Embodiment The control device 100 performs control based on the flowcharts of FIGS. 7, 8 and 10. That is, when there are no hopping codes in which the hopping frequency bands do not overlap in ST21 and when there are communication zones in which there is no problem of radio wave interference in ST22, control based on the flowchart of FIG. 10 is performed.

This is the hopping code C11, C12, ..., C21, C22, ..., C81, for each zone extracted in ST31.
From C82, ..., Codes having overlapping hopping frequency bands are assigned to the wireless communication zone where the distance between the zones is the largest.

Subsequently, from the hopping codes of each zone extracted in ST32, the codes which do not overlap the hopping frequency band except the allocated codes are allocated to the remaining wireless communication zones. Then, in ST33, the assigned hopping code is notified to the radio master station of each zone.

For example, it is assumed that an interfering radio wave D as shown in FIG. 13 is emitted to each of the wireless communication zones Z1 to Z8. On the other hand, it is assumed that there are only eight hopping codes C12 to C82 shown in Table 8 that can be used in the system.

[0081]

[Table 8] On the other hand, since the frequency band in which the interfering wave is emitted is as shown in Table 9 in each zone, the hopping code for avoiding the interfering wave in each zone is as shown in Table 10.

[0082]

[Table 9]

[Table 10] When the extraction of the contents of Table 10 is completed, the control device 100 operates as shown in FIG.
Processing based on the flow chart of 0 is performed. The control device 100 stores information that there is no fear of radio wave interference between the zones Z1 and Z8 and the zones Z4 and Z5.

For example, assuming that the hopping frequency bands of zones Z1 and Z8 overlap, allocation of hopping codes to each zone is as shown in Table 11.

[0084]

[Table 11] The control device 100 notifies the radio master stations M1 to M8 of the allocation of the hopping code via the communication cable 200, and the respective radio master stations M1 to M8 are respectively in zones Z1 to Z.
Hopping is started at 8 and communication is started.

FIG. 14 shows the arrangement of spectrums after communication has started. That is, also in this case, the jamming radio waves D existing in each zone are avoided.

Therefore, even if such control is performed, it is possible to prevent the transmission quality of communication from being deteriorated by the interfering wave. In the zone Z1, the hopping code C12 is set to the zone Z1.
Since the hopping code C82 is used in FIG.
As is clear from FIG. 4, the frequency bands used overlap with the band number “18”. However, since the zones Z1 and Z8 are so far apart from each other that they do not interfere with each other, they do not affect each other's communication and deteriorate the communication quality.

As described above, also in this embodiment, the same effect as that of the first embodiment can be obtained.

Fourth Embodiment The control device 100 performs control based on the flowcharts of FIGS. 7, 8 and 11. That is, when there are no zones of hopping codes in which hopping frequency bands do not overlap in ST21 and when there are communication zones in which there is no problem of radio wave interference in ST22, control based on the flowchart of FIG. 11 is performed.

This is the hopping code C11, C12, ..., C21, C22, ..., C81, for each zone extracted in ST41.
From C82, ..., Eight hopping codes having the least overlap of hopping frequency bands are extracted.

Then, the hopping code extracted in ST42 is notified to the radio master station in each zone.

For example, it is assumed that an interference radio wave D as shown in FIG. 13 is emitted to each of the wireless communication zones Z1 to Z8. On the other hand, it is assumed that there are ten types of hopping codes C12 to C102 shown in Table 12 that can be used in the system.

[0092]

[Table 12] On the other hand, since the frequency band in which the interference wave is generated is as shown in Table 9 above, the hopping code for avoiding the interference wave in each zone is as shown in Table 13.

[0093]

[Table 13] When the extraction of the contents of Table 13 is completed, the control device 100
The processing based on the flow chart 1 is performed. That is, when trying to assign a hopping code to each wireless communication zone, there is no choice but to overlap some of the frequency bands used between the hopping codes.

Table 12 shows the relationship between the hopping code and the frequency used, as shown in Table 12. (a) Combination of hopping codes with no overlapping of used frequency bands C32, C52, C62, C72 (b) Combination of hopping codes with partially overlapped used frequency bands Combination with overlapping frequency band numbers "1": C22, C
92, C102 Combination of overlapping frequency band numbers "2": C42, C
92 Combination with overlapping frequency band number “13”: C42,
C92 Combination in which the frequency band number "16" overlaps: C12,
C102 Combination in which the frequency band number "18" overlaps: C12,
C82, C102 The four types of hopping codes of (a) above can be used simultaneously because there is no overlap in the frequency bands used. Since there are a total of eight wireless communication zones, it is necessary to extract the remaining four types of hopping codes from the above (b).

Of the above (b), C12, C22 and C42
In the above combination, there is no overlap in the frequency bands used by each other. Therefore, three of C12, C22, and C42 are extracted from the remaining four types of hopping codes, and the remaining one extracts a code having the smallest frequency band overlap with these hopping codes.

Here, C42 and C92 have frequency band numbers "2" and "13", and C12 and C102 have frequency band numbers "16" and "18", which overlap with two frequency bands. On the other hand, the combination of C22, C92 and C102 and the combination of C12, C82 and C102 both overlap only in one frequency band.

Therefore, the remaining one hopping code is 2
Instead of C92 and C102 overlapping in one frequency band,
C82 having less overlapping frequency bands than these is extracted.

Therefore, the hopping codes used are as follows. C32, C52, C62, C72, C12, C22, C
42, C82 Here, the hopping code assigned to each zone must simultaneously satisfy the conditions of Table 13 described above. Therefore, the allocation of the hopping code to each zone is similar to that in Table 11 described above, for example. However, in this case, the condition that C12 and C82 must be arranged so as to be used in the farthest zone is unnecessary.
Therefore, for example, as shown in Table 14, C82 is zone Z
7, C72 may be assigned to zone Z8.

[0099]

[Table 14] The control device 100 uses the communication cable 200 to transmit the data shown in Table 11.
Alternatively, the allocation of Table 14 is notified to each of the wireless master stations M1 to M8, hopping is started in each of the zones Z1 to Z8, and communication is started. The arrangement of the spectrum after communication has started,
In the case of code allocation according to Table 11, the same as in FIG. 14, and in the case of code allocation according to Table 14, FIG.
As shown in. That is, also in this case, the jamming radio waves D existing in each zone are avoided.

Therefore, even if such control is performed, it is possible to prevent the transmission quality of communication from being deteriorated by the interfering wave. Also, if the frequency bands to be used overlap between the hopping codes to be used, the combination of hopping codes that minimizes the overlapping frequency bands will be selected, which will affect each other's communication and degrade the communication quality. There is no.

As described above, also in this embodiment, the same effect as that of the first embodiment can be obtained.

In each of the above embodiments, the case where there are eight wireless communication zones Z1 to Z8 has been described, but the present invention is not necessarily limited to this, and there may be more or less than eight. Further, the types of hopping codes, the number of frequency bands to hop, the width of frequencies allocated to the system, the number of radio master stations, etc. are not limited to those in the above embodiments.

In each of the above-described embodiments, the operation of the radio master station in each zone sequentially monitoring the electric field strength of the frequency band assigned in advance and detecting the frequency band affecting the communication in the radio communication zone of the own station. Although it is performed prior to the communication, the present invention is not limited to this. For example, temporary communication may be interrupted during data communication to detect a frequency band that affects such communication. .

[0104]

As described above, according to the present invention, it is possible to provide a frequency hopping wireless communication method capable of preventing deterioration of communication quality due to jamming radio waves and deterioration of communication quality due to collision of used frequency bands.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a frequency hopping wireless communication system showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing configurations of a wireless master station and a wireless slave station in the embodiment.

FIG. 3 is a diagram showing an example of a frequency band in which jamming radio waves exist in each zone of the embodiment.

FIG. 4 is a flowchart showing control of the wireless master station of the embodiment.

FIG. 5 is a flowchart showing control of the control device of the embodiment.

FIG. 6 is a diagram showing a spectrum arrangement after the start of communication in the embodiment.

FIG. 7 is a flowchart showing a part of control of the control device according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing a part of control of the control device in the embodiment.

FIG. 9 is a flowchart showing a part of control of the control device in the embodiment.

FIG. 10 is a flowchart showing a part of control of the control device according to the third embodiment of the present invention.

FIG. 11 is a flowchart showing a part of control of the control device according to the fourth embodiment of the present invention.

FIG. 12 is a diagram showing a spectrum arrangement after the start of communication in the second embodiment of the present invention.

FIG. 13 is a diagram showing an example of a frequency band in which an interference radio wave exists in each zone of the third embodiment of the present invention.

FIG. 14 is a diagram showing a spectrum arrangement after the start of communication in the third embodiment of the present invention.

FIG. 15 is a diagram showing a spectrum arrangement after the start of communication in the fourth embodiment of the present invention.

FIG. 16 is a diagram for explaining zone configuration and spread code allocation in the first conventional example.

FIG. 17 is a block diagram showing a second conventional example.

FIG. 18 is a diagram showing an example of frequency arrangement when a hopping code is assigned to each zone using the spreading code assignment method in the first conventional example.

FIG. 19 is a diagram showing an example of frequency allocation when a hopping code is assigned to each zone using the spreading code assignment method in the second conventional example.

[Explanation of symbols]

 Z1 to Z8 ... Wireless communication zone M1 to M8 ... Wireless master station 100 ... Control device 14 ... Control circuit 14a ... Memory

Claims (4)

[Claims] 1. In each of the plurality of wireless communication zones, the electric field strength of each of a plurality of frequency bands previously assigned is sequentially monitored, and the frequency bands that affect communication in the wireless communication zone of the own station are stored. After that, a hopping code that avoids the stored frequency band is extracted, and a hopping code that avoids using the same frequency band between each wireless communication zone is selected from the extracted hopping code and assigned to each wireless communication zone. And a frequency hopping wireless communication method. 2. In each of the plurality of wireless communication zones, the electric field strength of each of a plurality of pre-allocated frequency bands is sequentially monitored to store the frequency band that affects communication in the wireless communication zone of the own station, After that, the hopping code that avoids the stored frequency band is extracted, and the hopping code used in each wireless communication zone is assigned from the extracted hopping code. A frequency hopping wireless communication method characterized by allocating to another wireless communication zone without interference. 3. In each of the plurality of wireless communication zones, the electric field strength of each of a plurality of pre-allocated frequency bands is sequentially monitored to store the frequency band affecting communication in the wireless communication zone of the own station, After that, a hopping code that avoids the stored frequency band is extracted, and if there is no hopping code that avoids the same frequency band between the wireless communication zones in the extracted hopping code, the extracted hopping code is the same as each other. Frequency hopping radio communication characterized by selecting a hopping code including the frequency band of the selected hopping code and allocating the selected hopping code to each wireless communication zone so that the distance between zones using the selected hopping code is maximized. Method. 4. In each of the plurality of wireless communication zones, the electric field strength of each of a plurality of pre-allocated frequency bands is sequentially monitored to store the frequency band affecting communication in the wireless communication zone of the own station, After that, a hopping code that avoids the stored frequency band is extracted, and if there is no hopping code that avoids the same frequency band between the wireless communication zones in the extracted hopping code, the same hopping code is extracted from the extracted hopping code. A frequency hopping wireless communication method, wherein a hopping code that minimizes the use of a frequency band is selected and assigned to each wireless communication zone.