Communication system, communication method, and program

Abstract

To provide a communication system that communicates using frequency hopping without being affected by interference waves, in frequency hopping across a plurality of frequency bands.SOLUTION: In a communication system 10 that includes a first communication device 100 and a second communication device 200, and that communicates using radio waves 1000 by performing frequency hopping across a plurality of frequency bands, the first communication device includes an interference wave detection block and a frequency hopping pattern selection block. The interference wave detection block identifies a frequency band in which an interference wave is present. The frequency hopping pattern selection block determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave is present, generates a first instruction to communicate using the first frequency hopping pattern, and transmits the first instruction to the second communication device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a communication system, a communication method, and a program. [Background technology]

[0002] Regarding frequency hopping in the presence of interference waves, the following documents can be cited:

[0003] Patent Document 1 relates to a wireless communication control method that employs an adaptive frequency hopping method, which creates a hopping pattern using available channels, restricts the use of the carrier channel if there is an interfering wave on that channel, and lifts the restriction on the use of that channel if there is no interfering wave on that channel.

[0004] Patent Document 2 relates to the same content as Patent Document 1. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-303379 [Patent Document 2] Japanese Patent Publication No. 2023-155973 Summary of the Invention [Problem to be solved by the invention]

[0006] The following analysis is given by the inventor.

[0007] By communicating using frequency hopping (FH) across multiple frequency bands, it is possible to expect improved continuity of communication even when interference is present within the communication frequency band. However, continuing to use a frequency band with interference when frequency hopping means continuing communication with reduced signal quality and also carries the risk of radio wave analysis.

[0008] An object of the present invention is to provide a communication system, a communication method, and a program that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves. [Means for solving the problem]

[0009] According to a first aspect of the present invention, there is provided a communication system including a first communication device and a second communication device, which performs communication by frequency hopping across a plurality of frequency bands, the first communication device includes an interference detection block and a frequency hopping pattern selection block; The interference detection block of the first communication device identifies a frequency band in which an interference wave exists, the frequency hopping pattern selection block of the first communication device determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; the frequency hopping pattern selection block of the first communication device generates a first instruction to communicate using the first frequency hopping pattern; A communication system may be provided in which the first communication device transmits the first instruction to the second communication device.

[0010] According to a second aspect of the present invention, in a communication system including a first communication device and a second communication device, which performs communication by frequency hopping across a plurality of frequency bands, a computer included in the first communication device identifies a frequency band in which an interference wave exists; the computer of the first communication device determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; the computer of the first communication device generates first instructions to communicate using the first frequency hopping pattern; A communication method can be provided in which the first communication device transmits the first instruction to the second communication device, the method being associated with a specific machine, a computer, that executes the method.

[0011] According to a third aspect of the present invention, there is provided a communication system including a first communication device and a second communication device, the communication system performing communication by frequency hopping across a plurality of frequency bands, the first communication device including: A process of identifying a frequency band in which an interference wave exists; determining a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; generating a first instruction to communicate using the first frequency hopping pattern; A program can be provided that causes the first communication device to execute a process of transmitting the first instruction to the second communication device.

[0012] These programs can be recorded on a computer-readable storage medium. The storage medium can be a non-transitory medium such as a semiconductor memory, a hard disk, a magnetic recording medium, or an optical recording medium. The present invention can also be embodied as a computer program product. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a communication system, a communication method, and a program that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a block diagram illustrating an example of a configuration of a communication system according to the present disclosure. [Figure 2] 10 is a flowchart illustrating an example of an operation of a communication system according to the present disclosure. [Figure 3] 2 is a block diagram showing an example of the configuration of a first communication device in the communication system according to the present disclosure. FIG. [Figure 4] FIG. 2 is a block diagram showing an example of the configuration of a second communication device in the communication system according to the present disclosure. [Figure 5] 1 is a block diagram illustrating an example of the configuration of a high-frequency unit of a communication device in a communication system according to the present disclosure. [Figure 6] FIG. 10 is a diagram illustrating an example of frequency hopping across multiple frequency bands. [Figure 7] FIG. 10 is a diagram illustrating an example of a method for collecting radio waves to detect jamming waves. [Figure 8] FIG. 10 is a diagram illustrating an example of a case where an interference wave is present in a frequency hopping operation across multiple frequency bands. [Figure 9] FIG. 10 is a sequence diagram illustrating an example of an operation of a communication system according to the present disclosure. [Figure 10] FIG. 10 is a sequence diagram illustrating an example of an operation of a communication system according to the present disclosure. [Figure 11] FIG. 1 is a diagram illustrating an example of communication using frequency hopping across multiple frequency bands without being affected by interference waves in a communication system according to the present disclosure. [Figure 12] FIG. 10 is a sequence diagram illustrating an example of an operation of a communication system according to the present disclosure. [Figure 13] FIG. 10 is a sequence diagram illustrating an example of an operation of a communication system according to the present disclosure. [Figure 14] FIG. 10 is a diagram illustrating an example of communication using frequency hopping across multiple frequency bands in a communication system according to the present disclosure when an interfering wave disappears. [Figure 15]FIG. 10 is a diagram illustrating an example of a case where an interference wave occurs in another band during frequency hopping across multiple frequency bands. [Figure 16] FIG. 10 is a sequence diagram illustrating an example of an operation of a communication system according to the present disclosure. [Figure 17] FIG. 10 is a diagram showing an example of communication using frequency hopping without being affected by interference waves when interference waves are present in another frequency band in frequency hopping across multiple frequency bands in a communication system according to the present disclosure. [Figure 18] FIG. 1 is a diagram illustrating the configuration of a computer that constitutes a communication device of a communication system according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] In this disclosure, the drawings may relate to one or more embodiments. In addition, each embodiment described below can be combined with other embodiments as appropriate, and the present invention is not limited to each embodiment.

[0016] First, an overview of one embodiment will be described with reference to the drawings. Note that the reference numerals attached to the drawings in this overview are attached to each element for convenience as an example to facilitate understanding, and are not intended to limit the present invention to the illustrated form. Furthermore, connecting lines between blocks in the drawings and the like referred to in the following description include both bidirectional and unidirectional lines. Unidirectional arrows are used to schematically indicate the flow of main signals (data) and do not exclude bidirectionality.

[0017] Fig. 1 is a block diagram showing an example of the configuration of a communication system according to the present disclosure. Referring to Fig. 1, the communication system 10 includes a first communication device 100 and a second communication device 200, and performs frequency hopping across multiple frequency bands to communicate using radio waves 1000.

[0018] The first communication device 100 may include a frequency hopping (FH) pattern generation circuit 122, an interference detection block 124, a frequency hopping (FH) pattern selection block 121, and a high frequency unit 130. The interference detection block 124 of the first communication device identifies a frequency band in which an interference signal is present. The frequency hopping pattern selection block 121 of the first communication device 100 determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference signal is present. The frequency hopping pattern selection block 121 of the first communication device 100 generates a first instruction to perform communication using the first frequency hopping pattern. The first communication device 100 transmits the first instruction to the second communication device 200. The first instruction may include information on the first frequency hopping pattern and a first start frequency to be used when starting to switch the FH pattern.

[0019] The second communication device 200 may further include a frequency hopping (FH) pattern generation circuit 222, an interference wave detection block 224, a frequency hopping (FH) pattern selection block 221, and a high frequency unit 230. Upon receiving the first instruction, the frequency hopping pattern selection block 221 of the second communication device 200 determines a first timing for starting communication using a first frequency hopping pattern. The second communication device 200 transmits the first timing to the first communication device 100. The frequency hopping pattern selection block 121 of the first communication device 100 changes the frequency hopping pattern to a first frequency hopping pattern based on the first timing transmitted from the second communication device 200. The first communication device and the second communication device start communication using the first frequency hopping pattern and a first start frequency.

[0020] The first timing may notify the time to start communication using the first frequency hopping pattern. The first communication device 100 may be configured to start communication using the first frequency hopping pattern from the notified time or from the start point of the first transmission assigned to the first communication device 100 after the notified time (for example, in the case of performing time division multiple access (TDMA) communication by switching between transmission and reception, the first timing to switch from reception to transmission after the notified time).

[0021] Fig. 2 is a flowchart showing an example of the operation of the communication system 10 according to the present disclosure shown in Fig. 1. The operation of the communication system 10 will be described with reference to Fig. 1 and Fig. 2. The operation starts in step S201.

[0022] Next, in step S202, the communication device 100 collects radio waves from the high frequency part of the high frequency part 130 in a frequency band that is not used for FH (Frequency Hopping) communication.

[0023] Next, in step S203, the interference detection block 124 of the communication device 100 identifies a frequency band in which interference waves exist at a number of frequencies equal to or greater than a specified value.

[0024] Next, in step S204, the frequency band in which the interfering wave exists is notified to the FH pattern selection block 121 in the communication device 100.

[0025] Next, in step S205, the FH pattern selection block 121 determines (selects) an FH pattern corresponding to a combination of frequency bands excluding the frequency band in which the interfering wave is detected.

[0026] Next, in step S206, the first communication device 100 transmits a first instruction to communicate using the determined (selected) first FH pattern to the second communication device 200. The first instruction may include information on the first frequency hopping pattern and the first start frequency when starting to switch the FH pattern.

[0027] Next, in step S207, the FH pattern selection block 221 in the second communication device 200 determines a first timing for starting communication using the first FH pattern determined (selected) by the first communication device 100.

[0028] Next, in step S208, the second communication device 200 transmits to the first communication device 100 the first timing for starting communication using the determined (selected) first FH pattern.

[0029] Next, in step S209, the FH pattern selection block 121 in the first communication device 100 changes the FH pattern of the FH pattern generation circuit 122 to the determined (selected) first FH pattern at the first timing determined by the second communication device 200.

[0030] Next, in step S210, the first communication device 100 and the second communication device 200 start FH communication using the determined (selected) first FH pattern and first start frequency.

[0031] Therefore, according to one embodiment, a communication system, a communication method, and a program can be provided that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves.

[0032] [First embodiment] Next, the first embodiment will be described in detail with reference to the drawings. Fig. 3 is a block diagram showing an example of the configuration of a first communication device 100 of a communication system 10 according to the present disclosure. Referring to Fig. 3, the first communication device 100 includes a signal processing unit 110 and a high-frequency unit 130. The signal processing unit 110 includes a signal processing block 120, a first frequency band modulation / demodulation block 111, a second frequency band modulation / demodulation block 112, and a third frequency band modulation / demodulation block 113. The signal processing block 120 includes an FH pattern selection block 121, an FH pattern generation circuit 122, a frequency band determination block 123, an interference wave detection block 124, and a transmission data generation unit 125. The high-frequency unit 130 includes a first frequency band high-frequency unit 131, a second frequency band high-frequency unit 132, and a third frequency band high-frequency unit 133.

[0033] 4 is a block diagram showing an example of the configuration of second communication device 200 of communication system 10 according to the present disclosure. The configuration of second communication device 200 will be described assuming that it is the same as the configuration of first communication device 100. Referring to FIG. 4, second communication device 200 includes signal processing unit 210 and high-frequency unit 230. Signal processing unit 210 includes signal processing block 220, first frequency band modulation / demodulation block 211, second frequency band modulation / demodulation block 212, and third frequency band modulation / demodulation block 213. Signal processing block 220 includes FH pattern selection block 221, FH pattern generation circuit 222, frequency band determination block 223, interference wave detection block 224, and transmission data generation unit 225. High-frequency unit 230 includes first frequency band high-frequency unit 231, second frequency band high-frequency unit 232, and third frequency band high-frequency unit 233.

[0034] Fig. 5 is a block diagram showing an example of the configuration of a high-frequency unit of a communication device of communication system 10 according to the present disclosure. Referring to Fig. 5, high-frequency unit 300 includes a frequency synthesizer 310, a low-noise amplifier (LNA) 320, a mixer 330, an intermediate frequency (IF) converter 340, a power amplifier (PA) 350, and a filter 360. The output of filter 360 is emitted as radio waves 301 via an antenna (not shown), and the output of the antenna (not shown) that receives radio waves 301 is input to LNA 320. The configurations of the first frequency band high frequency section 131, the second frequency band high frequency section 132, and the third frequency band high frequency section 133 of the high frequency section 130 of the first communication device 100, and the first frequency band high frequency section 231, the second frequency band high frequency section 232, and the third frequency band high frequency section 233 of the high frequency section 230 of the second communication device 200 will be described below as having the same configuration as the high frequency section 300 shown in Fig. 5, but this is not intended to limit the high frequency sections of each communication device to having the same configuration. The bidirectional input / output 391 of the IF converter 340 corresponds to the bidirectional inputs / outputs 191, 192, and 193 of the first communication device 100 and the bidirectional inputs / outputs 291, 292, and 293 of the second communication device 200. Furthermore, the input 381 of the frequency synthesizer 310 corresponds to the output 1111 from the first frequency band modulation / demodulation block 111, the output 1121 from the second frequency band modulation / demodulation block 112, and the output 1131 from the third frequency band modulation / demodulation block 113 of the first communication device 100, and the output 2111 from the first frequency band modulation / demodulation block 211, the output 2121 from the second frequency band modulation / demodulation block 212, and the output 2131 from the third frequency band modulation / demodulation block 213 of the second communication device 200.

[0035] Fig. 6 is a diagram showing an example of frequency hopping operation across multiple frequency bands. Referring to Fig. 6, an example is shown in which frequency hopping (hereinafter also referred to as FH) is performed across a first frequency band 510, a second frequency band 520, and a third frequency band 530. The first frequency band 510 includes carrier frequencies f511 to f515, the second frequency band 520 includes carrier frequencies f521 to f525, and the third frequency band 530 includes carrier frequencies f531 to f535. Note that Fig. 6 shows an example of multiple frequency bands, and does not limit the present invention to three frequency bands or five carriers. In the example of frequency hopping operation shown in Figure 6, as time t passes, communication is performed using carrier frequency f535 in the third frequency band, then carrier frequency f524 in the second frequency band, then carrier frequency f513 in the first frequency band, and then carrier frequency f533 in the third frequency band, and communication is performed using FH while switching frequency bands sequentially.

[0036] As for the FH patterns to be used in FH, it is also possible to prepare as many FH patterns as there are possible combinations of frequency bands to be used in FH, and determine or select an FH pattern from among them to perform FH. As an example of the FH patterns, the following FH patterns (1) to (7) may be prepared and stored in the FH pattern selection block 121 of the first communication device 100 and the FH pattern selection block 221 of the second communication device 200, and the FH pattern selection block 221 may determine or select an FH pattern.

[0037] (1) First frequency band / Second frequency band / Third frequency band (2) First frequency band / second frequency band (3) First frequency band / third frequency band (4) Second frequency band / third frequency band (5) First frequency band (6) Second frequency band (7) Third frequency band The first frequency band may be a short wave (HF, High Frequency) band, the second frequency band may be a very high frequency (VHF, Very High Frequency) band, and the third frequency band may be an ultra high frequency (UHF, Ultra High Frequency) band.The FH pattern shown as an example of frequency hopping operation in Figure 6 is (1) an FH pattern corresponding to the first frequency band / second frequency band / third frequency band, and performing frequency hopping operation between the first frequency band / second frequency band / third frequency band.

[0038] Next, a method of collecting radio waves for detecting jamming waves will be described in detail with reference to the drawings. Fig. 7 is a diagram showing an example of a method of collecting radio waves for detecting jamming waves. Fig. 7 shows an example of a method of collecting radio waves for detecting jamming waves when FH is performed using an FH pattern of (1) the first frequency band / second frequency band / third frequency band.

[0039] 7, it is assumed that communication is performed using first frequency band 510 during time period Δt1. During this time period Δt1, second frequency band 520 and third frequency band 530 are not used for communication. That is, first frequency band high frequency unit 131 of first communication device 100 is used for communication, but second frequency band high frequency unit 132 and third frequency band high frequency unit 133 are not used for communication. As a result, for example, by determining what percentage of carrier frequencies among carrier frequencies f521 to f525 in the demodulated signal of second frequency band 520 sent from second frequency band high frequency unit 132 to interference wave detection block 124 via second frequency band modulation / demodulation block 112 contain interference waves at a level equal to or greater than a predetermined value, the frequency band in which interference waves are present is identified. That is, when interference waves of a level equal to or higher than a predetermined value exist in a frequency equal to or higher than a predetermined number of frequencies in the frequency band used for FH (if the number of carriers in the frequency band is determined, this is equivalent to the proportion of the predetermined value), the third frequency band high frequency unit 133 identifies the frequency band as one in which interference waves exist.

[0040] 7, during time period Δt2, third frequency band 530 is used for communication, but first frequency band 510 and second frequency band 520 are not used for communication. Also, during time period Δt3, second frequency band 520 is used for communication, but first frequency band 510 and third frequency band 530 are not used for communication. Therefore, similar to time period Δt1, during time periods Δt2 and Δt3, radio waves for detecting interference are collected in the frequency bands not used for communication using the corresponding high frequency unit, the corresponding modulation / demodulation block, and the interference detection block 124.

[0041] [Communication system behavior when jamming waves are detected] Next, (1) the operation of the communication system when an interference wave is detected while performing FH using an FH pattern of the first frequency band / second frequency band / third frequency band will be described. Fig. 8 is a diagram showing an example of a case where an interference wave is present during frequency hopping across multiple frequency bands. Referring to Fig. 8, the operation of the communication system 10 will be described below assuming that an interference wave 536 is present in the third frequency band.

[0042] 9 and 10 are sequence diagrams showing an example of the operation of the communication system according to the present disclosure. The portion of Fig. 9 with the symbol A written inside a circle is assumed to be connected to the portion of Fig. 10 with the symbol A written inside a circle. Furthermore, the portion of Fig. 9 with the symbol B written inside a circle is assumed to be connected to the portion of Fig. 10 with the symbol B written inside a circle.

[0043] It is assumed that the first communication device 100 and the second communication device 200 perform FH using the FH pattern of (1) the first frequency band / second frequency band / third frequency band until they detect an interfering wave.

[0044] Next, in step S801, the frequency band determination block 123 transmits the reception frequency obtained from the FH pattern to the frequency synthesizer of each high frequency unit (e.g., the first frequency band high frequency unit 131).The frequency band determination block 123 transmits the reception frequency for radio wave collection to the frequency synthesizers of the high frequency units not used in FH communication (e.g., the second frequency band high frequency unit 132 and the third frequency band high frequency unit 133).

[0045] Next, in step S802, first frequency band high frequency unit 131 of the frequency band (first frequency band) used for FH communication receives FH communication at the frequency transmitted from frequency band determination block 123. Second frequency band high frequency unit 132 and third frequency band high frequency unit 133 of the frequency bands (second and third frequency bands) not used for FH communication collect radio waves for detecting jamming waves.

[0046] Next, in step S803, the radio waves collected for detecting interference waves are sent to the interference wave detection block 124.

[0047] Next, in step S804, the interference detection block 124 detects what percentage of frequencies in each frequency band contain interference waves, and identifies frequency bands that contain interference waves at a number (or percentage (if the number of carriers in the frequency band is fixed, this is equivalent to the specified percentage)) greater than a predetermined value.

[0048] Next, in step S805, the interference detection block 124 notifies the FH pattern selection block 121 of frequency bands in which there are interference waves equal to or greater than a predetermined value.

[0049] Next, in step S806, the FH pattern selection block 121 of the first communication device 100 determines (selects) the first FH pattern to be used next (for example, (2) first frequency band / second frequency band). However, at this stage, only the FH pattern to be changed to is determined (selected), and the FH pattern is not changed to the FH pattern of (2) first frequency band / second frequency band. (In other words, communication continues using the FH pattern of (1) first frequency band / second frequency band / third frequency band.)

[0050] Next, in step S807, the first communication device 100 transmits a first instruction to the second communication device 200 to communicate using the determined (selected) first FH pattern. The FH pattern used during this transmission is the FH pattern ((1) first frequency band / second frequency band / third frequency band) that has been used up until then.

[0051] Next, in step S808, upon receiving the first instruction transmitted in step S807, the second communication device 200 determines a first timing for starting communication using the determined (selected) first FH pattern in the FH pattern selection block 221. Note that the first instruction may include information on the first frequency hopping pattern and the first start frequency for starting FH pattern switching.

[0052] Next, in step S809, the second communication device 200 assigns the first timing for starting communication using the determined (selected) first FH pattern to the transmission data 204 for FH communication by the transmission data generation unit 225, and transmits the data to the first communication device 100. The FH pattern used during this transmission also uses the FH pattern ((1) first frequency band / second frequency band / third frequency band) that has been used up until then.

[0053] Next, in step S810, the FH pattern selection block 121 of the first communication device 100 receives the first timing (the timing to change the FH pattern to (2) the first frequency band / second frequency band).

[0054] Next, in step S811, the FH pattern generated by the FH pattern generating circuit 122 is changed to the determined (selected) first FH pattern ((2) first frequency band / second frequency band) in accordance with the first timing (the second communication device 200 also changes its FH pattern at the same timing).

[0055] Next, in step S812, the first communication device 100 and the second communication device 200 start FH communication using the selected first FH pattern and first start frequency.

[0056] 11 is a diagram showing an example of communication using frequency hopping across multiple frequency bands without being affected by jamming waves in a communication system according to the present disclosure. Referring to FIG. 11, FH communication resulting from the operations of steps S801 to S812 is shown, and it shows that FH communication between first communication device 100 and second communication device 200 is being performed using a first FH pattern corresponding to a combination of frequency bands (first frequency band and second frequency band) excluding third frequency band 530 in which jamming wave 536 is present.

[0057] Therefore, according to the first embodiment, it is possible to provide a communication system, a communication method, and a program that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves.

[0058] [Second embodiment] Next, a second embodiment will be described in detail with reference to the drawings. The second embodiment relates to the operation of a communication system when it is detected that an interfering wave has disappeared.

[0059] In the second embodiment, the communication system 10 will be described as operating using a first communication device 100 shown in Fig. 3 and a second communication device 200 shown in Fig. 4. The configurations of the first frequency band high frequency unit 131, the second frequency band high frequency unit 132, and the third frequency band high frequency unit 133 of the high frequency unit 130 of the first communication device 100, and the first frequency band high frequency unit 231, the second frequency band high frequency unit 232, and the third frequency band high frequency unit 233 of the high frequency unit 230 of the second communication device 200 will be described below as having the same configuration as the high frequency unit 300 shown in Fig. 5, but this does not mean that the high frequency units of the communication devices are limited to having the same configuration.

[0060] [Communication system behavior when detecting the disappearance of interference signals] Next, (2) the operation of the communication system when it is detected that interference wave 536 has disappeared while FH communication is being performed using the first FH pattern of the first frequency band / second frequency band will be described.

[0061] 12 and 13 are sequence diagrams showing an example of the operation of the communication system according to the present disclosure. The part of Fig. 12 marked with a C in a circle is connected to the part of Fig. 10 marked with a C in a circle. Furthermore, the part of Fig. 12 marked with a D in a circle is connected to the part of Fig. 10 marked with a D in a circle. The part of Fig. 12 marked with an E in a circle is connected to the part of Fig. 13 marked with an E in a circle. Furthermore, the part of Fig. 12 marked with an F in a circle is connected to the part of Fig. 13 marked with an F in a circle.

[0062] Assume that (2) FH communication is being performed using the FH pattern of the first frequency band / second frequency band in a state where interference wave 536 exists in third frequency band 530 as shown in FIG.

[0063] In step S813 of FIG. 12, the interference wave detection block 124 monitors whether the interference wave 536 has disappeared.

[0064] Next, in step S814, if the interference wave 536 has not disappeared (S813 No), the interference wave detection block 124 continues monitoring. If the interference wave 536 has disappeared (S813 Yes), the process proceeds to step S815.

[0065] Next, in step S815, the interference wave detection block 124 notifies the FH pattern selection block 121 of the frequency band in which the interference wave 536 has disappeared.

[0066] Next, in step S816, the FH pattern selection block 121 of the first communication device 100 selects a second FH pattern to be used next (for example, (1) the first frequency band / second frequency band / third frequency band). However, at this stage, the FH pattern to be changed is simply selected, and the FH pattern is not changed to the FH pattern of (1) the first frequency band / second frequency band / third frequency band. (Communication continues using the FH pattern of (2) the first frequency band / second frequency band.)

[0067] Next, in step S817, the first communication device 100 transmits a second instruction to the second communication device 200 to communicate using the selected second FH pattern. The FH pattern used during this transmission is the FH pattern ((2) first frequency band / second frequency band) that has been used up until then.

[0068] Next, in step S818, when the second communication device 200 receives the second instruction transmitted in step S817, the FH pattern selection block 221 determines the second timing for starting communication using the determined (selected) second FH pattern.

[0069] Next, in step S819, the second communication device 200 assigns the second timing for starting communication using the determined (selected) second FH pattern to the transmission data 204 for FH communication by the transmission data generation unit 225, and transmits the data to the first communication device 100. The FH pattern used during this transmission also uses the FH pattern ((2) first frequency band / second frequency band) that has been used up until then.

[0070] Next, in step S820, the FH pattern selection block 121 of the first communication device 100 receives the second timing (the timing to change the FH pattern to (1) the first frequency band / second frequency band / third frequency band).

[0071] Next, in step S821, the FH pattern generated by the FH pattern generating circuit 122 is changed to the determined (selected) second FH pattern ((1) first frequency band / second frequency band / third frequency band) in accordance with the second timing (the second communication device 200 also changes the FH pattern at the same timing).

[0072] Next, in step S822, the first communication device 100 and the second communication device 200 start FH communication using the selected second FH pattern and second start frequency.

[0073] 14 is a diagram showing an example of communication using frequency hopping across multiple frequency bands by a communication system according to the present disclosure when jamming wave 536 disappears. Fig. 14 shows an example of FH communication as a result of the operations of steps S813 to S822, and when jamming wave 536 disappears, communication system 10 performs FH communication using the first frequency band, the second frequency band, and the third frequency band.

[0074] That is, when the interference detection block 124 of the first communication device 100 detects that the interference wave has disappeared, the frequency hopping pattern selection block 121 of the first communication device 100 determines a second frequency hopping pattern. The frequency hopping pattern selection block 121 of the first communication device 100 generates a second instruction to perform communication using the second frequency hopping pattern. The first communication device 100 transmits the second instruction to the second communication device 200. Note that the second instruction may include information on the second frequency hopping pattern and a second start frequency to be used when starting to switch the FH pattern.

[0075] Furthermore, upon receiving the second instruction, the frequency hopping pattern selection block 221 of the second communication device 200 determines a second timing to start communication using the second frequency hopping pattern. The second communication device 200 transmits the second timing to the first communication device 100. The frequency hopping pattern selection block 121 of the first communication device 100 changes the first frequency hopping pattern to a second frequency hopping pattern based on the second timing transmitted from the second communication device 200, and the first communication device and the second communication device start communication using the second frequency hopping pattern and a second start frequency.

[0076] The second frequency hopping pattern may be configured to be determined so as to maximize the number of frequency bands to be used among frequency bands excluding frequency bands in which interference waves exist.

[0077] Therefore, according to the second embodiment, it is possible to provide a communication system, a communication method, and a program that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves.

[0078] [Third embodiment] Next, a third embodiment will be described in detail with reference to the drawings. In the third embodiment, a communication system 10 will be described as operating using a first communication device 100 shown in Fig. 3 and a second communication device 200 shown in Fig. 4. The configurations of the first frequency band high frequency unit 131, the second frequency band high frequency unit 132, and the third frequency band high frequency unit 133 of the high frequency unit 130 of the first communication device 100, and the first frequency band high frequency unit 231, the second frequency band high frequency unit 232, and the third frequency band high frequency unit 233 of the high frequency unit 230 of the second communication device 200 will be described below as having the same configuration as the high frequency unit 300 shown in Fig. 5, but this does not mean that the high frequency units of each communication device are limited to having the same configuration.

[0079] [Operation when interference occurs in other bands] Fig. 15 is a diagram showing an example of a case where a jamming signal occurs in another band during frequency hopping across multiple frequency bands. Since jamming signal 536 exists in third frequency band 530 shown in Fig. 11, jamming signal 526 occurs in second frequency band 520 when FH communication is being performed using the first FH pattern corresponding to the combination of the first and second frequency bands, i.e., after FH communication is started using the first FH pattern in step S812 shown in Fig. 10.

[0080] Next, an operation will be described when the second communication device 200, not the first communication device 100, detects that a jamming wave 526 has also occurred in the second frequency band 520. Even if the first communication device 100 is unable to detect the jamming wave 526, the second communication device 200 may be able to detect the jamming wave 526. FIG. 16 is a sequence diagram showing an example of the operation of the communication system according to the present disclosure. The portion marked with a C in a circle in FIG. 16 is assumed to be connected to the portion marked with a C in a circle in FIG. 10. Furthermore, the portion marked with a D in a circle in FIG. 16 is assumed to be connected to the portion marked with a D in a circle in FIG. 10.

[0081] Referring to FIG. 16, in step S1600, the interference wave detection block 224 of the second communication device 200 identifies the frequency band in which the interference wave 526 exists, for example the second frequency band. Then, in step S1601, the FH pattern selection block 221 determines (selects) the third FH pattern to be used (for example, (5) the first frequency band).

[0082] Next, in step S1602, the second communication device 200 transmits a third instruction to the first communication device 100 to communicate using the determined (selected) third FH pattern. In this case, the first FH pattern ((2) first frequency band / second frequency band) that has been used until then is used for transmission. The third instruction may include information on the third frequency hopping pattern and the third start frequency when switching of the FH pattern begins.

[0083] Next, in step S1603, the first communication device 100 determines a third timing for starting communication using the determined (selected) third FH pattern in the FH pattern selection block 121.

[0084] Next, in step S1604, the transmission data generation unit 125 adds the third timing to the transmission data 104 for FH communication and transmits it to the second communication device 200.

[0085] Next, in step S1605, the FH pattern selection block 221 of the second communication device 200 receives the third timing (the timing to change the FH pattern to (5) the first frequency band).

[0086] Next, in step S1606, the FH pattern generated by the FH pattern generating circuit 222 is changed to the selected third FH pattern in accordance with the third timing for changing to the received third FH pattern (the first communication device 100 also changes the FH pattern at the same timing).

[0087] Next, in step S1607, the first communication device 100 and the second communication device 200 start FH communication using the selected third FH pattern and third start frequency.

[0088] 17 is a diagram showing an example of a case where communication is performed using frequency hopping across multiple frequency bands by a communication system according to the present disclosure without being affected by jamming waves when jamming waves are present in another frequency band. As described above, in the case where jamming waves 536 exist in third frequency band 530, after FH communication is started using the first FH pattern, jamming waves 526 are generated in second frequency band 520. Therefore, communication is performed using the third frequency hopping pattern corresponding to the first frequency band excluding third frequency band 530 and second frequency band 520.

[0089] Therefore, according to the third embodiment, it is possible to provide a communication system, a communication method, and a program that contribute to communication using frequency hopping across multiple frequency bands without being affected by interference waves.

[0090] In addition, the operation of the communication system when it is detected that the interference wave has disappeared as described in the second embodiment and the operation when an interference wave has occurred in another band as described in the second embodiment can be executed simultaneously following the operation of the communication system when an interference wave is detected as described in the first embodiment.

[0091] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and further modifications, substitutions, and adjustments can be made without departing from the basic technical concept of the present invention. For example, the network configurations, element configurations, and message expression formats shown in the drawings are examples to aid in understanding the present invention, and the present invention is not limited to the configurations shown in these drawings. Furthermore, "A and / or B" is used to mean at least either A or B.

[0092] Furthermore, the procedures shown in the above-described embodiment and the first to third embodiments can be realized by a program that causes a computer (9000 in FIG. 18) that functions as a communication device according to the present invention to realize the functions of the communication device. Such a computer is exemplified by a configuration including a CPU (Central Processing Unit) 9010, a communication interface 9020, a memory 9030, and an auxiliary storage device 9040 in FIG. 18. That is, the CPU 9010 in FIG. 18 executes a control program for the communication device, and performs an update process for each calculation parameter stored in the auxiliary storage device 9040, etc.

[0093] The memory 9030 is a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.

[0094] That is, each part (processing means, function) of the communication device shown in the above-mentioned embodiment and the first to third embodiments can be realized by a computer program that causes the processor of the above-mentioned computer to execute each of the above-mentioned processes using its hardware.

[0095] Finally, preferred embodiments of the present invention will be summarized. [First form] The communication system may include a first communication device and a second communication device, and may communicate using frequency hopping across multiple frequency bands. The first communication device may include a jamming wave detection block and a frequency hopping pattern selection block. The interference detection block of the first communication device may identify a frequency band in which an interference wave exists. The frequency hopping pattern selection block of the first communication device may determine a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interfering signal is present. The frequency hopping pattern selection block of the first communication device may generate a first instruction to communicate using the first frequency hopping pattern. The first communication device may transmit the first instruction to the second communication device. [Second form] In the communication system according to the first aspect, the second communication device may further include a frequency hopping pattern selection block; The frequency hopping pattern selection block of the second communication device may determine a first timing to start communication using the first frequency hopping pattern upon receiving the first instruction; The second communication device may transmit the first timing to the first communication device; The frequency hopping pattern selection block of the first communication device may change a frequency hopping pattern to the first frequency hopping pattern based on the first timing transmitted from the second communication device; The first communication device and the second communication device may initiate communication using the first frequency hopping pattern. [Third Form] In the communication system described in the first or second embodiment, it is preferable that the interference wave detection block of the first communication device identifies a frequency band as one in which interference waves are present when interference waves of a level above a predetermined value are present at frequencies greater than or equal to a specified number within the frequency band. [Fourth Form] In the communication system according to the first or second aspect, it is preferable that the plurality of frequency bands include a short wave (HF, High Frequency) band, a very high wave (VHF, Very High Frequency) band, and an ultra high wave (UHF, Ultra High Frequency) band. [Fifth Form] In a communication system according to a second aspect, when the interference detection block of the first communication device detects that the interference wave has disappeared, the frequency hopping pattern selection block of the first communication device determines a second frequency hopping pattern; the frequency hopping pattern selection block of the first communication device generates a second instruction to communicate using the second frequency hopping pattern; The first communication device preferably transmits the second instruction to the second communication device. [Sixth Form] In a communication system according to a fifth aspect, the frequency hopping pattern selection block of the second communication device, upon receiving the second instruction, determines a second timing to start communication using the second frequency hopping pattern; the second communication device transmits the second timing to the first communication device; The frequency hopping pattern selection block of the first communication device changes the first frequency hopping pattern to the second frequency hopping pattern based on the second timing transmitted from the second communication device; Preferably, the first communication device and the second communication device initiate communication using the second frequency hopping pattern. [7th form] In the communication system described in the fifth aspect, it is preferable that the second frequency hopping pattern is determined so as to maximize the number of frequency bands to be used among frequency bands excluding frequency bands in which the interfering waves exist. [8th form] In a communication system according to a second aspect, the first timing notifies a time to start communication using the first frequency hopping pattern; the first communication device, From the time, or After the time, it is preferable to start communication using the first frequency hopping pattern from the start of a first transmission assigned to the first communication device. [9th Form] A communication system including a first communication device and a second communication device, which performs communication by frequency hopping across a plurality of frequency bands, The communication method may include a computer included in the first communication device identifying a frequency band in which an interfering wave exists. The communication method may include the computer of the first communication device determining a first frequency hopping pattern corresponding to a combination of frequency bands excluding a frequency band in which the interfering signal exists. The communication method may include the computer of the first communication device generating a first instruction to communicate using the first frequency hopping pattern. The communication method may include the first communication device transmitting the first instruction to the second communication device. [10th Form] The program is provided to a computer included in a first communication device of a communication system that includes a first communication device and a second communication device and that performs communication by frequency hopping across a plurality of frequency bands, the computer including the first communication device: A process for identifying a frequency band in which an interfering wave exists may be executed. The program may cause the computer to execute a process of determining a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interfering wave is present. The program may cause the computer to execute a process of generating a first instruction to perform communication using the first frequency hopping pattern. The program may cause the computer to execute a process of transmitting the first instruction from the first communication device to the second communication device. The ninth and tenth embodiments can be expanded into the second to eighth embodiments in the same manner as the first embodiment.

[0096] The disclosures of the above-cited patent documents are incorporated herein by reference. Modifications and adjustments of the embodiments and examples are possible within the scope of the entire disclosure of the present invention (including the claims), and further based on the basic technical concept thereof. Furthermore, various combinations and selections of the various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the scope of the disclosure of the present invention. In other words, the present invention naturally embraces various modifications and alterations that would be possible by a person skilled in the art in accordance with the entire disclosure and technical concept, including the claims. In particular, with regard to the numerical ranges set forth herein, any numerical value or subrange within that range should be construed as specifically set forth, even if not otherwise specified. Furthermore, the disclosures of the above-cited documents, when used in part or in whole in combination with the disclosures herein as part of the disclosure of the present invention, in accordance with the spirit of the present invention, are also deemed to be included in the disclosures of this application. [Explanation of symbols]

[0097] 10. Communication Systems 100 First communication device 200 Second communication device 110, 210 signal processing unit 111, 211 1st frequency band modulation / demodulation block 112, 212 Second frequency band modulation / demodulation block 113, 213 3rd frequency band modulation / demodulation block 120, 220 signal processing block 121, 221 FH pattern selection block 122, 222 FH pattern generator circuit 123, 223 frequency band determination block 124, 224 Interference detection block 125, 225 Transmission data generation unit 130, 230 High frequency section 131, 231 First frequency band high frequency section 132, 232 Second frequency band high frequency section 133, 233 Third frequency band high frequency section 300 High Frequency Section 310 Frequency Synthesizer 320 Low Noise Amplifier (LNA) 330 Mixer 340 Intermediate Frequency (IF) Converter 350 Power Amplifier (PA) 360 Filter 1000 Radio Waves 9000 computers 9010 CPU 9020 Communication Interface 9030 Memory 9040 Auxiliary storage device

Claims

1. A communication system including a first communication device and a second communication device, which performs communication by frequency hopping across a plurality of frequency bands, the first communication device includes an interference detection block and a frequency hopping pattern selection block; The interference detection block of the first communication device identifies a frequency band in which an interference wave exists, the frequency hopping pattern selection block of the first communication device determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; the frequency hopping pattern selection block of the first communication device generates a first instruction to communicate using the first frequency hopping pattern; The first communication device transmits the first instruction to the second communication device.

2. the second communication device further includes a frequency hopping pattern selection block; the frequency hopping pattern selection block of the second communication device, upon receiving the first instruction, determines a first timing to start communication using the first frequency hopping pattern; the second communication device transmits the first timing to the first communication device; The frequency hopping pattern selection block of the first communication device changes a frequency hopping pattern to the first frequency hopping pattern based on the first timing transmitted from the second communication device; The communication system of claim 1 , wherein the first communication device and the second communication device initiate communication using the first frequency hopping pattern.

3. The communication system described in claim 1 or 2, wherein the interference wave detection block of the first communication device identifies the frequency band as a frequency band in which interference waves exist when interference waves of a level above a predetermined value exist at a number of frequencies greater than or equal to a specified value within the frequency band.

4. 3. The communication system according to claim 1, wherein the plurality of frequency bands include a short wave (HF, High Frequency) band, a very high frequency (VHF, Very High Frequency) band, and an ultra high frequency (UHF, Ultra High Frequency) band.

5. When the interference detection block of the first communication device detects that the interference wave has disappeared, the frequency hopping pattern selection block of the first communication device determines a second frequency hopping pattern; the frequency hopping pattern selection block of the first communication device generates a second instruction to communicate using the second frequency hopping pattern; The communication system according to claim 2 , wherein the first communication device transmits the second instruction to the second communication device.

6. the frequency hopping pattern selection block of the second communication device, upon receiving the second instruction, determines a second timing to start communication using the second frequency hopping pattern; the second communication device transmits the second timing to the first communication device; The frequency hopping pattern selection block of the first communication device changes the first frequency hopping pattern to the second frequency hopping pattern based on the second timing transmitted from the second communication device; The communication system of claim 5 , wherein the first communication device and the second communication device initiate communication using the second frequency hopping pattern.

7. The communication system according to claim 5 , wherein the second frequency hopping pattern is determined so as to maximize the number of frequency bands to be used among frequency bands excluding the frequency band in which the interfering wave exists.

8. the first timing notifies a time to start communication using the first frequency hopping pattern; the first communication device, From the time, or The communication system according to claim 2 , wherein, after the time, communication using the first frequency hopping pattern is started from a start point of a first transmission assigned to the first communication device.

9. A communication system including a first communication device and a second communication device, which performs communication by frequency hopping across a plurality of frequency bands, a computer included in the first communication device identifies a frequency band in which an interference wave exists; the computer of the first communication device determines a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; the computer of the first communication device generates a first instruction to communicate using the first frequency hopping pattern; A communication method, wherein the first communication device transmits the first instruction to the second communication device.

10. A communication system includes a first communication device and a second communication device, and performs communication by frequency hopping across a plurality of frequency bands. A computer included in the first communication device A process of identifying a frequency band in which an interference wave exists; determining a first frequency hopping pattern corresponding to a combination of frequency bands excluding the frequency band in which the interference wave exists; generating a first instruction to communicate using the first frequency hopping pattern; a program that causes a process of transmitting the first instruction from the first communication device to the second communication device to be executed;

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