JP4432679B2 - Interference wave prediction type frequency control communication method and communication control apparatus - Google Patents

Description

  The present invention relates to an interference wave prediction type frequency control communication system, and in particular, in wireless communication when using a wireless apparatus using a spread spectrum local area network (hereinafter referred to as SS wireless LAN). It belongs to the technical field of securing stable wireless communication by avoiding this when receiving interference from other wireless equipment.

  Technology development to ensure stable wireless communication by avoiding interference from other wireless equipment in wireless communication when using a wireless device using SS wireless LAN, which has been widely spread in recent years Is making rapid progress. A frequency band in which this SS wireless LAN is mainly used is called an ISM band (Industrial, Scientific, Medical Band), and a 2.4 GHz band (2400 MHz to 2500 MHz) is used.

  This ISM band is a frequency that is open to industrial scientific medical equipment such as high-frequency heating equipment (microwave oven), medical equipment, security radio, etc. in addition to SS wireless LAN, and is used in many countries. Even when this ISM band radio wave is used, it is a frequency band that is used not only for the SS wireless LAN but also for other standard radios. In addition, it is a frequency band in which radio waves output by the on-site mobile identification device exist. .

  Therefore, when the SS wireless LAN is used in the frequency band of this ISM band, (a) the radio wave output from the SS wireless LAN device of the same standard installed for other purposes, and (b) the wireless of another standard are used. Since there is a possibility that communication may be disturbed by radio waves output from the radio equipment, technology for detecting the interference wave and appropriately avoiding the detected interference wave is important.

[Prior art 1]
FIG. 3 is an electrical equivalent diagram of the interference-free communication method of the prior art 1. (See Patent Document 1). Prior art 1 of FIG. 3 ensures good communication quality by requesting the transmission side to change the spreading code or frequency channel when the communication quality deteriorates in the wireless communication system and changing the spreading code or frequency channel. Technology.

  In FIG. 3, when a switching signal is sent from a partner station by a specific time slot, the carrier frequency switching request signal detection circuit 110 detects via the antenna 106, the antenna duplexer 105, the receiver 107, and the decoder 108. In response to this, the frequency switching control circuit 109 switches the frequencies of the transmitter 104 and the receiver 107. When the BER measurement circuit 111 determines the deterioration of the reception status, the carrier frequency switching request signal multiplexing circuit 112 generates a switching signal in response to this, and supplies the switching signal to the encoder 103 to insert it into a predetermined time slot. While transmitting by the duplexer 105 and the antenna 106, the frequency switching control circuit 109 switches the frequencies of the transmitter 104 and the receiver 107.

[Prior Art 2]
FIG. 4 is an electrical equivalent diagram of the spread spectrum communication apparatus of Prior Art 2. (See Patent Document 2). Prior art 2 in FIG. 4 is a technique for automatically switching transmission / reception frequencies and eliminating interference interference in a wireless communication system that performs time division multiplexing transmission / reception.

  In FIG. 4, a communication quality monitoring unit 211 that outputs a correlation value threshold change signal, a spread code setting signal, and a frequency setting signal based on an error correction / detection execution signal is configured in addition to a conventional spread spectrum communication apparatus. When the communication quality deteriorates or is likely to deteriorate in the synchronization maintaining mode (hereinafter, referred to as deterioration), it is always changed to another spreading code or frequency channel in order to ensure good communication quality. Thus, the transmission side is positively charged, and then the spread code or frequency channel designated by the transmission side is changed.

[Prior Art 3]
FIG. 5 is an electrical equivalent diagram of the wireless communication monitoring system of Prior Art 3. (See Patent Document 3). The prior art 3 in FIG. 5 is a technique for detecting and storing the presence of an interference wave by switching the reception frequency.

  In FIG. 5, the reception frequency is sequentially switched over all frequencies by the frequency switch 305, the reception level at that time is detected by the radio wave level detector 303, and the detection level corresponding to the frequency is stored in the logging storage unit 306. At this time, the reference level is compared with each detection level, and it is determined whether or not it is an interference wave based on the comparison result. This comparison result is also stored in the logging storage unit 306, and the above processing is controlled by the clock 307 at a constant period to detect intermittent generation of interference waves.

The patent documents are as follows.
Japanese Patent Laid-Open No. 06-85794 Japanese Patent Laid-Open No. 06-252882 Japanese Patent Laid-Open No. 08-70271

  Conventionally, when communication deteriorates during wireless communication by a wireless communication device, the frequency is switched when it is detected whether there is an interference wave in the frequency channel being used and the presence of the interference wave is confirmed. As a result, a technology for avoiding the influence of the interference wave and attempting stable communication has been developed and put into practical use. However, the switched frequency channel may be affected by other interference waves, and it is not certain whether stable communication can be performed even if the frequency channel is switched.

  As described above, in the prior art, when switching to another frequency due to the presence of a disturbing wave, an appropriate determination is made as to which frequency to switch to not be affected by another disturbing wave, It was not possible to avoid the influence of the jamming wave. Therefore, it is not possible to determine whether there is an interfering wave at the frequency to be switched, and to predict the presence of the interfering wave and to switch it in advance before being affected by the interfering wave. It was.

  The present invention detects the presence of the interference wave in real time, changes the frequency so as to avoid the interference wave, and if the frequency fluctuation of the interference wave can be predicted, the frequency can be avoided. It is an object of the present invention to provide an interference wave prediction type frequency control communication system that is less affected by an interference wave by changing in advance.

As shown in FIG. 2, the present invention is a wireless method using an SS wireless LAN communication system that forms a wireless communication network by a time division multiplex communication system.
Interference wave that determines whether there is a radio signal that is in the same frequency band used for communication in the wireless network of its own slave device (hereinafter referred to as its own station) and that is used for other purposes or for other purposes The existence determination process,
The optimum frequency selection process for selecting the optimum frequency that is most unlikely to be affected by the interference wave, as determined from the interference signal data of the existing radio signal,
An interference wave predictive communication control method and control apparatus including an optimum frequency change instruction process for instructing change to an optimum frequency when communication quality deteriorates.

As shown in FIG. 1, the present invention is a wireless device using an SS wireless LAN communication system that forms a wireless communication network by a time division multiplex communication system.
An interfering wave detection circuit 10 that determines whether or not there is a radio signal that is in the same frequency band used for communication in the wireless network of the local station and is used for other purposes than the local station;
An optimum frequency selection circuit 7 for selecting an optimum frequency that is most unlikely to be affected by the interference wave as determined from the interference signal data of the existing radio signal;
It is a jamming wave prediction type communication control device including an optimum frequency change instruction circuit 8 that instructs a change to an optimum frequency when communication quality is deteriorated.

  It is not necessary to have all the effects of the present invention described below at the same time, as long as they have one or more effects of the present invention.

  The present invention detects the presence of the interference wave in real time, changes the frequency so as to avoid the interference wave, and if the frequency fluctuation of the interference wave can be predicted, the frequency can be avoided. By changing in advance, it is possible to make it less susceptible to the interference wave.

  By grasping the presence of jamming waves in each frequency channel in real time, the present invention can reduce the frequency to a frequency with no interference or a low influence of interference when communication quality deteriorates or is expected to deteriorate. By changing, it can be expected to minimize the deterioration of communication quality.

As shown in FIG. 2, the best mode for carrying out the invention is a wireless method using an SS wireless LAN communication system that forms a wireless communication network by a time division multiplex communication system.
Interference wave presence investigation step ST1 for switching the frequency in order and measuring whether or not a radio signal exists at the frequency,
An interference wave presence investigation data storage step ST2 for storing the interference wave presence investigation result;
An interference wave presence / absence determination step ST3 for determining whether or not a wireless signal exists in the measured result;
A radio signal band checking step ST4 for checking the band of the radio signal when the radio signal exists;
Radio signal bandwidth survey data storage step ST5 for storing bandwidth survey results;
A radio signal bandwidth threshold determination step ST6 for determining whether the bandwidth is equal to or greater than a threshold;
SS wireless LAN signal detection step ST7 for detecting whether the wireless signal is an SS wireless LAN system of the same standard;
SS wireless LAN signal detection data storage step ST8 for storing SS wireless LAN signal detection data;
A wireless signal bandwidth threshold determination step ST9 for determining whether or not the SS wireless LAN signal is equal to or greater than a threshold;
Understand interference conditions at other frequencies and search for a frequency that seems to have good communication quality.Sequentially communicate it to the other station of communication, and if frequencies with good communication quality match each other, this frequency Is stored as a changeable frequency group, and if the communication quality at the frequency currently in use deteriorates or if deterioration of the communication quality is predicted, the frequency is changed according to a mutually determined rule. This is a jamming wave predictive communication control method including a frequency switching step ST10.

[Embodiments other than the best mode]
In the following, in addition to the best mode for carrying out the invention described above, embodiments capable of carrying out the invention of the present application are listed. Since the embodiments will be described with reference to the drawings, the drawings described in the embodiments will be described.

The terms used in the following description are roughly classified as follows.
“Survey” represents a high-level concept, and “Survey” results include direct data such as measurement (value) and detection (value), and indirect data such as data collected from outside, statistical data, and data obtained by the learning function. It is roughly classified into (information), selecting mainly by direct data is called “discrimination”, and selecting mainly by indirect data is called “judgment”.

  Further, in the example of the above-described embodiment, “existing” of “disturbing wave data of the existing radio signal” means that “not present” is not disturbed at present, Includes cases where interference is expected.

[Explanation of FIG. 1]
FIG. 1 is a block diagram of an embodiment of an interference wave prediction type frequency control communication apparatus of the present invention. The antenna 1 transmits and receives radio waves for time division multiplex communication, and transmits and receives radio waves for checking whether radio waves exist at other frequencies by switching the reception frequency of the local station during the standby time.

  The transmission / reception circuit 2 outputs a radio wave of time division multiplex communication and a radio wave transmitted from the own station to the antenna 1 and outputs the received radio wave to the modulation / demodulation circuit 3. The modulation / demodulation circuit 3 modulates the secondary modulated signal that has been first modulated at the time of transmission into an RF signal and outputs it to the transmission / reception circuit 2, and at the time of reception, the RF signal is secondarily demodulated and passed through a bandpass filter. The signal is first demodulated and output to the interference wave detection circuit 10. The modulation / spreading / encoding processing circuit 4 performs spreading processing by adding a PN code to the primary modulated signal of the modulation / demodulation circuit 3 at the time of transmission, and at the time of receiving a PN code synchronized with the PN code. Add despreading processing.

  The jamming wave data storage circuit 5 switches the frequency and checks whether or not a radio signal exists at the frequency, and the jamming wave survey result and the band survey result that investigates whether or not the radio signal is a narrow band. And a function of storing jamming wave data composed of SS wireless LAN signal detection results. The interference wave data discriminating circuit 6 includes (a) a function for discriminating whether or not a radio signal exists in the measurement result, (b) a function for discriminating whether or not the band is equal to or greater than a threshold value, and (c) an SS radio. A function is provided for determining whether or not the LAN signal is greater than or equal to a threshold value.

  The frequency setting circuit 7 is an optimum frequency selection circuit, searches for a frequency that seems to have good communication quality by grasping the interference state at other frequencies, and sequentially transmits it to the communication partner station to mutually communicate the communication quality. If the good frequency matches, this frequency is stored as a frequency group that can be changed, and the communication quality at the current frequency is deteriorated or the deterioration of the communication quality is predicted Changes the frequency according to mutually determined rules. The frequency control circuit 8 is an optimum frequency change instruction circuit, and avoids interference by switching the frequency.

  The interference wave detection circuit 10 switches the reception frequency of its own station during the standby time and determines whether or not a radio wave exists at another frequency (hereinafter referred to as reception level detection) and each frequency. The wireless signal band investigation function unit 12 that investigates the bandwidth of the wireless signal existing in (investigates whether it is a narrow band) and the SS wireless LAN signal detection unit 13 that determines whether the signal is an SS wireless LAN signal of the same standard Consists of.

[Explanation of FIG. 2]
FIG. 2 is a flowchart showing the operation sequence of the block diagram of FIG. The interference wave presence investigation step ST1 switches the frequency in order and measures whether or not a radio signal exists at the frequency. The interference wave presence investigation data storage step ST2 stores the interference wave presence investigation result. The interference wave presence / absence determination step ST3 determines whether or not a radio signal exists in the measured result.

  In the wireless signal band checking step ST4, when a wireless signal exists, the band of the wireless signal is checked. Radio signal band survey data storage step ST5 stores the band survey results. Radio signal band threshold determination step ST6 determines whether or not the band is equal to or greater than the threshold.

  SS wireless LAN signal detection step ST7 detects whether the wireless signal is the SS wireless LAN system of the same standard. SS wireless LAN signal detection data storage step ST8 stores SS wireless LAN signal detection data. SS wireless LAN signal threshold value determination step ST9 determines whether or not the SS wireless LAN signal is equal to or greater than the threshold value. The frequency switching step ST10 instructs switching (changing) to an optimum frequency when the communication quality deteriorates.

[Correspondence between Embodiment, Block Diagram of FIG. 1 and Flowchart of FIG. 2]
The correspondence relationship between the embodiment described later, the block diagram of the example of FIG. 1 and the flowchart of the example of FIG. 2 is as follows. The flow chart of FIG. 2 includes an interference wave presence / absence determination process, a radio signal band threshold determination process, an SS wireless LAN signal threshold determination process, and an optimum frequency change instruction process.

  The main part of the interference wave presence / absence determination process is an interference wave presence / absence determination step ST3. The interference wave presence investigation step ST1 and the interference wave presence investigation data storage step ST2 collect and store data used in the determination step. . The main part of the radio signal band threshold discrimination process is the radio signal band threshold discrimination step ST6, and the band survey step ST4 and the radio signal band survey data storage step ST5 collect data used in the discrimination step. And remember.

  Further, the main part of the SS wireless LAN signal threshold determination process is an SS wireless LAN signal threshold determination step ST9, and the SS wireless LAN signal detection step ST7 and the SS wireless LAN signal detection data storage step ST8 are determination steps. Collect and store data for use in The main parts of the interference wave data discrimination process or optimum frequency selection process are an interference wave presence / absence discrimination step ST3, a radio signal band threshold discrimination step ST6, and an SS wireless LAN signal threshold discrimination step ST9. The optimum frequency change instruction process is a frequency switching step ST10 for switching the frequency in accordance with an instruction in the SS wireless LAN signal threshold value determining step ST9. The main parts of the jamming wave detection function or process are the jamming wave presence checking step ST1, the radio signal band checking step ST4, and the SS wireless LAN signal detecting step ST7.

  The interference wave data storage circuit 5 of FIG. 1 is a circuit for executing the interference wave presence investigation data storage step ST2, the wireless signal band investigation data storage step ST5, and the SS wireless LAN signal detection step ST7 of FIG. The jamming wave data discrimination circuit 6 in FIG. 1 is a circuit for executing the jamming wave presence / absence judgment step ST3, the radio signal band threshold judgment step ST6, and the SS wireless LAN signal threshold judgment step ST9 in FIG. .

[Exemplary Embodiment]
Hereinafter, embodiments will be described with reference to the drawings.

In the communication control method using the SS wireless LAN communication method for forming the wireless communication network by the time division multiplex communication method as shown in FIG.
An interference wave presence / absence determination process for determining whether or not there is a radio signal that is in the same frequency band used for communication in the wireless network of the local station and that is used for other purposes than the local station, and
Judging from the interference signal data of the existing radio signal, the optimum frequency selection process for selecting the optimum frequency that is least susceptible to the interference,
This is an interference wave predictive communication control method including an optimum frequency change instruction process for instructing a change to the selected optimum frequency when communication quality is deteriorated.

Embodiment 2 is a communication control apparatus using an SS wireless LAN communication system that forms a wireless communication network by a time division multiplex communication system.
An interfering wave data discriminating circuit 6 for discriminating whether or not there is a radio signal which is in the same frequency band used for communication in the radio network of the own station and is used for other purposes than the own station;
An optimum frequency selection circuit 7 for selecting an optimum frequency that is most unlikely to be affected by the interference wave as judged from the interference wave data of the existing radio signal;
It is a jamming wave prediction type communication control device including an optimum frequency change instruction circuit 8 that instructs a change to the optimum frequency selected when the communication quality is deteriorated.

Embodiment 3 is a communication control method using an SS wireless LAN communication method for forming a wireless communication network by a time division multiplex communication method.
Reception that detects the level of the received radio wave when receiving whether there is a radio signal that is in the same frequency band used for communication in the local station's wireless network and is used for other purposes or for other purposes A level detection function (11) and a radio signal band check function (12) for checking the band of the radio signal and an SS for detecting whether the radio signal is present in an SS radio signal of the same standard as the radio communication system of the own station A jamming wave detection process (10) for executing a wireless LAN signal detection function (13);
The optimum frequency selected above when the communication quality deteriorates or is predicted to be deteriorated by selecting and predicting the optimum frequency that is least susceptible to the influence of the interference wave judging from the interference signal data of the existing radio signal This is an interference wave predictive communication control method comprising an optimum frequency change instruction process (8) for instructing a change to the interference frequency.

Embodiment 4 is a communication control apparatus using an SS wireless LAN communication system that forms a wireless communication network by a time division multiplex communication system.
Reception that detects the level of the received radio wave when receiving whether there is a radio signal that is in the same frequency band used for communication in the local station's wireless network and is used for other purposes or for other purposes Level detection function unit 11 and radio signal band survey function unit 12 that investigates the band of the radio signal and SS wireless LAN signal that detects whether the radio signal is an SS radio signal of the same standard as the radio communication device of the local station An interference wave detection circuit 10 including a detection function unit 13;
The optimum frequency selected above when the communication quality deteriorates or is predicted to be deteriorated by selecting and predicting the optimum frequency that is least susceptible to the influence of the interference wave judging from the interference signal data of the existing radio signal It is an interference wave prediction type communication control device comprising an optimum frequency change instruction circuit (8) for instructing a change to the frequency.

  In the fifth embodiment, when the optimum frequency change instruction process (ST10) described in the first embodiment or the third embodiment is affected by the disturbance wave when the disturbance wave fluctuates constantly over time, This is an interference wave predictive communication control method for switching frequencies.

  In the sixth embodiment, when the optimum frequency change instruction process (ST10) described in the first embodiment or the third embodiment is prone to time-interfering interference waves, a frequency having the least influence is predicted. This is an interference wave prediction type communication control method for switching frequencies.

  In the seventh embodiment, when the disturbance wave of the optimum frequency change instruction circuit (ST10) described in the second embodiment or the fourth embodiment fluctuates constantly in time, the frequency is changed before being affected by the disturbance wave. It is a jamming wave prediction type communication control device for switching between.

  In the eighth embodiment, when the interference wave of the optimum frequency change instruction circuit (ST10) described in the second embodiment or the fourth embodiment tends to be a disturbance wave that is present in time statistics, the frequency that has the least influence is used. Is a jamming wave prediction type communication control device that switches the frequency by predicting.

As shown in the flowchart of FIG. 2, the ninth embodiment transmits / receives time division multiplex communication radio waves and switches the reception frequency of the local station during the standby time to investigate whether radio waves exist at other frequencies. In a wireless method using the SS wireless LAN communication method for transmitting and receiving radio waves,
Interference wave presence investigation step ST1 for switching the frequency in order and measuring whether or not a radio signal exists at the frequency,
An interference wave presence investigation data storage step ST2 for storing the interference wave presence investigation result;
An interference wave presence / absence determination step ST3 for determining whether or not a wireless signal exists in the measured result;
A radio signal band checking step ST4 for checking the band of the radio signal when the radio signal exists;
Radio signal bandwidth survey data storage step ST5 for storing bandwidth survey results;
A radio signal bandwidth threshold determination step ST6 for determining whether the bandwidth is equal to or greater than a threshold;
SS wireless LAN signal detection step ST7 for detecting whether the wireless signal is an SS wireless LAN system of the same standard;
SS wireless LAN signal detection data storage step ST8 for storing SS wireless LAN signal detection data;
A radio signal band threshold determination step ST9 for determining whether or not the interference wave data is equal to or greater than a threshold;
Understand interference conditions at other frequencies and search for a frequency that seems to have good communication quality.Sequentially communicate it to the other station of communication, and if frequencies with good communication quality match each other, this frequency Is stored as a changeable frequency group, and if the communication quality at the frequency currently in use deteriorates or if deterioration of the communication quality is predicted, the frequency is changed according to a mutually determined rule. This is a jamming wave predictive communication control method including a frequency switching step ST10.

In the tenth embodiment, as shown in the block diagram of FIG. 1, the reception frequency of the local station is transmitted and received using time-division multiplex communication radio waves and a standby time other than the time to be transmitted or received by the local station. An antenna 1 for transmitting and receiving radio waves to investigate whether radio waves exist at other frequencies by switching between
At the time of transmission, the secondary modulated signal that has been first modulated and then modulated is modulated into an RF signal and output to the transmission / reception circuit 2. At the time of reception, the RF signal is secondarily demodulated and the signal that has passed through the bandpass filter is primarily demodulated. Modulation / demodulation circuit 3 that outputs to interference wave detection circuit 10;
A transmission / reception circuit 2 that outputs a radio wave of time division multiplex communication and a radio wave transmitted from the own station to the antenna 1, and outputs the received radio wave to the modulation / demodulation circuit 3;
Modulation / spreading is performed by adding a PN code to the modulation signal of the modulation / demodulation circuit 3 at the time of transmission and spreading the signal, and adding a PN code synchronized with the PN code to the signal at the time of reception at the time of reception. An encoding processing circuit 4;
The reception level detection function unit 11 that determines whether radio waves exist at other frequencies by switching the reception frequency of the local station using the standby time and whether the radio signal existing at each frequency is in a narrow band. An interfering wave detection circuit 10 comprising a radio signal band investigation function unit 12 for determining and an SS wireless LAN signal detecting unit 13 for determining whether the signal is an SS wireless LAN signal of the same standard;
From the interference wave presence investigation result obtained by switching the frequency and measuring whether or not a radio signal exists at the frequency, the band investigation result obtained by examining whether or not the radio signal is narrow and the SS wireless LAN signal detection result An interference wave data storage circuit 5 for storing the interference wave data,
When an interference wave exists and is a radio wave from the SS wireless LAN device of the same standard, a frequency control circuit 8 that avoids interference interference by switching a dangerous frequency that most adversely affects communication quality to a frequency that does not adversely affect,
Understand interference conditions at other frequencies and search for a frequency that seems to have good communication quality.Sequentially communicate it to the other station of communication, and if frequencies with good communication quality match each other, this frequency Is stored as a changeable frequency group, and if the communication quality at the frequency currently in use deteriorates or if deterioration of the communication quality is predicted, the frequency is changed according to a mutually determined rule. This is a jamming wave prediction type communication control device including a frequency setting circuit 7.

  The interference signal data of the wireless signal described in the first embodiment or the third embodiment includes the interference signal presence investigation data for storing the interference signal presence investigation result, the wireless signal band investigation data for storing the bandwidth investigation result, and the SS wireless LAN signal. An interference wave predictive communication control method which is SS wireless LAN signal detection data for storing detection data.

  The interference signal data of the radio signal described in the second embodiment or the fourth embodiment includes the interference signal presence investigation data for storing the interference signal presence investigation result, the radio signal band investigation data for storing the bandwidth investigation result, and the SS wireless LAN signal. Interference wave prediction type communication control device which is SS wireless LAN signal detection data storing detection data.

[Key points of differences in functions between the prior art 1 to the prior art 3 and the embodiment]
The main points of the difference in function between the prior art 1 to the prior art 3 and the embodiment will be described below. As described above, the prior art 1 in FIG. 3 requests a transmission side to change the spreading code or frequency channel when the communication quality deteriorates, and secures the communication quality by changing the spreading code or frequency channel. However, even if the frequency channel is switched, it may be affected by another interference wave, and it is not certain whether stable communication can be performed even if the frequency channel is changed.

  That is, as in the embodiment, the prior art 1 detects in advance whether or not an interference wave already exists at the frequency to be changed, and further predicts the presence of an interference wave in the future. It is not a technique that can be changed to a frequency that is not affected by the interference wave. On the other hand, the embodiment detects whether there is a radio signal in the same frequency band used for communication in the wireless network of the local station and used for other purposes or for other purposes as a jamming wave. In this technique, the optimum frequency that is least susceptible to the interference wave is selected by judging the interference wave data, and instructing the change to the optimum frequency when the communication quality is deteriorated.

  As described above, the prior art 2 in FIG. 4 actively transmits the transmission side so as to change to another spreading code or frequency channel in order to always ensure good communication quality when the communication quality deteriorates in the synchronization holding mode. In the same manner as in the prior art 1, the switched frequency channel is also affected by the influence of another interference wave and stable communication is performed. I was not sure if I could do that. The following description is the same as in the prior art 1.

  As described above, the prior art 3 in FIG. 5 sequentially switches the reception frequency over all frequencies, measures and stores the reception level at that time, and compares the reference level with each detection level at this time. This is a technique for discriminating whether or not it is an interference wave based on the comparison result, and storing it at a fixed period.However, as in the embodiment, it is detected in advance whether or not the interference wave already exists at the frequency to be changed. However, it is not a technique that can predict the presence of a future jamming wave and change it in advance before receiving the jamming wave.

[Description of Embodiment]
In the communication method according to the present invention, the order of transmission / reception wireless packets is set in advance in each wireless device forming the wireless communication network by the time division multiplex communication method. Here, the wireless device that determines the synchronization timing indicating the start time of the transmission / reception wireless packet between the wireless devices is referred to as a main station device, and the synchronization timing of the transmission / reception wireless packet is determined according to the synchronization timing determined by the main station device. The determined wireless device is called a slave device.

  Regarding the initial operation for determining the synchronization timing of each slave station device, first, a radio packet is transmitted in accordance with the synchronization timing determined by the master station device. Is detected. Since the master station device and each slave station device perform time division multiplex communication according to the order of transmission / reception wireless packets set in advance, the time other than the time to transmit or receive by the own station is the time for the standby operation. Using this standby time, the reception frequency of the local station is switched to determine whether or not radio waves exist at other frequencies. If the transmission or reception or both are continuously performed, the waiting time is eliminated. In this case, the frequency can be changed independently by adding a set of the receiving unit of the transmission / reception circuit 2 and the modulation / demodulation circuit 3. To investigate the interference state.

When radio waves are present at other frequencies, the following procedure is performed during the standby time.
(A) First, the frequency is switched and whether or not a radio signal exists at the frequency is measured.
(B) Next, when a wireless signal is present, it is determined whether or not the wireless signal has a narrow band.
(C) Further, it is determined whether or not the wireless signal is an SS wireless LAN device of the same standard.
The above procedure is performed while changing the reception frequency in order. The measured result is stored in the interference wave data storage circuit 5 such as a memory.

  According to the above measurement, if there is no interfering wave, it is determined that the frequency is a frequency at which good communication quality can be expected even if it is changed. In this case, it is not necessary to switch the frequency immediately.

  In addition, when there is an interference wave from the SS wireless LAN device of the same standard, it is a dangerous frequency that most adversely affects the communication quality, so it is necessary to avoid interference by switching to a frequency that does not have an adverse effect. In this case, by statistically processing the stored jamming data, for example, if there is a tendency in the frequency of occurrence of jamming waves of a specific frequency during a specific time zone such as a holiday or nighttime, Has the effect of preventing the influence of interference waves by using a learning prediction function that predicts that a specific interference wave is likely to occur and changes the frequency to another frequency in advance. These functions can be performed by a frequency setting circuit (optimum frequency selection circuit) 7.

  On the other hand, when there is a jamming wave and the jamming wave has a narrow band and is not a jamming wave from the SS wireless LAN device of the same standard, the frequency of the jamming wave is relatively less affected by the jamming.

  Further, when the time-dependent frequency fluctuation of the radio signal is examined and the power supply frequency is relatively slow, the radio wave is mainly from a high-frequency heating device.

  In the case of an interference wave from a high-frequency heating device or the like, it is possible to predict the fluctuation of the frequency. At this time, the influence of the interference wave can be reduced by performing communication while switching to another frequency according to the fluctuation of the interference wave.

  In addition, even when no interference is being received, if there is a tendency for interference at a specific frequency to occur in a specific time zone or day of the week due to statistical processing of stored interference data, There is an effect of preventing the influence of jamming waves by a learning prediction function that avoids a different frequency before the day of the week when the frequency is generated in advance.

  As described above, grasp the interference state at other frequencies, search for a frequency that seems to have good communication quality, and sequentially convey it to the communication partner station. If they match, this frequency is stored as a frequency group that can be changed, and if the communication quality at the frequency currently in use deteriorates or if it is predicted that the communication quality will be deteriorated, decide each other. Change the frequency according to established rules. When frequencies with good communication quality do not match each other, a method of transmitting at a frequency with good reception by the other party is effective. That is, when the transmission frequency (downlink frequency) from the master station apparatus to the slave station apparatus is f1, the slave station apparatus has good communication quality, but when the transmission frequency is f2, the slave station apparatus is expected to deteriorate the communication quality. When the transmission frequency (downlink frequency) f1 from the master station device to the slave station device is communicated, and conversely, when the transmission frequency (uplink frequency) from the slave station device to the master station device is f2, the slave station device When the communication quality is good, but when the transmission frequency is f1, the main station apparatus predicts the deterioration of the communication quality, and the communication is performed at the transmission frequency (upstream frequency) f2 from the slave station apparatus to the main station apparatus. Is advantageous.

[Explanation of FIG. 1]
The general operation of the communication system according to the block diagram of the embodiment of the interference predictive frequency control communication apparatus of FIG. 1 described above has been described in the embodiment, and will be omitted.

  In the figure, the antenna 1 transmits and receives radio waves of time division multiplex communication, and switches the reception frequency of the local station using a standby time other than the time to transmit or receive the local station. Send and receive radio waves to investigate whether radio waves are present.

  The transmission / reception circuit 2 outputs a radio wave of time division multiplex communication and a radio wave transmitted from the own station to the antenna 1 and outputs the received radio wave to a modulation / demodulation circuit 3 described later. The modulation / demodulation circuit 3 modulates a secondary modulation (spread) signal, which has been subjected to primary modulation such as phase modulation (PSK) and frequency modulation (FSK), during transmission into a 2.4 GHz (RF) signal and outputs the modulated signal to the transmission / reception circuit 2. To do. Further, at the time of reception, the RF signal is secondarily demodulated (despread) and the signal that has passed through the bandpass filter (BPF) is primarily demodulated and output to the interference wave detection circuit 10. At the time of transmission, the first modulated signal of the modulation / demodulation circuit 3 is spread by adding a PN code, and at the time of reception, the first modulated signal is despread by adding a PN code. The modulation / spreading / coding processing circuit 4 has a function of processing the upper layer (2 to 4 layers) side of the physical layer.

  The interference wave detection circuit 10 includes a reception level detection function unit 11, a radio signal band inspection function unit 12, and an SS wireless LAN signal detection unit 13. The reception level detection function unit 11 executes the interference wave presence investigation step ST1 that switches the frequency in order and measures whether or not a radio signal exists at the frequency. This reception level detection function unit 11 uses the standby time to switch the reception frequency of its own station, and in order to investigate whether radio waves exist at other frequencies, Measure the level. As a method of measuring the radio wave level, the received signal is detected by envelope detection.

  When there is a radio signal, the radio signal band checking function unit 12 executes a radio signal band checking step ST4 for checking the band of the radio signal. The radio signal band examining function unit 12 determines whether or not the radio signal existing at each frequency is a narrow band.

  As a discrimination method, if the received signal is passed through a narrowband filter and then envelope detection is performed and there is no change, the signal is a narrowband signal. In addition, a frequency discriminator or the like is used to investigate whether this signal fluctuates over time.

  The SS wireless LAN signal detection unit 13 executes an SS wireless LAN signal detection step ST7 for detecting whether the wireless signal is an SS wireless LAN system of the same standard.

  The interfering wave data discriminating circuit 6 has (a) a function for executing an interfering wave presence / absence discriminating step ST3 for discriminating whether or not a radio signal is present in the measurement result, and (b) a radio signal band is equal to or greater than a threshold value. A function of executing a radio signal band threshold determination step ST6 for determining whether or not there is, and (c) an SS wireless LAN signal threshold determination step ST9 for determining whether or not the SS wireless LAN signal is equal to or greater than a threshold. Has the function to execute.

  The function of executing the SS wireless LAN signal threshold determination step ST9 determines whether or not the signal is an SS wireless LAN signal of the same standard. As this determination method, (a) a code having a high correlation is used by spread spectrum demodulation (despreading). (B) Further, as a method of detecting the SS wireless LAN signal, a characteristic code (header signal) given to the head portion of the wireless packet is detected and determined.

  Here, the spread spectrum demodulation means that the spectrum of the secondary modulation signal spread on the transmission side is received on the reception side, the spread spectrum is despread, and the spectrum of the secondary demodulation signal is converted to a bandpass filter. This means that the primary demodulated signal is output after passing.

The interference wave data storage circuit 5 stores the following result.
(A) Interference wave existence investigation result, interference wave existence presence / absence determination result data obtained by measuring whether or not a radio signal exists at the frequency in step 2 described later.
(B) In step 5 to be described later, band investigation results obtained by examining whether or not a radio signal is a narrow band, radio signal band threshold determination result data, and the like.
(C) SS wireless LAN signal detection storage data for storing SS wireless LAN signal detection data, SS wireless LAN signal threshold determination result data, and the like in step 8 described later.

  As described in the embodiment, when the interference wave is present and the radio wave is from the SS wireless LAN device of the same standard, the frequency control circuit 8 determines the dangerous frequency that most adversely affects the communication quality. Switch to a non-frequency to avoid interference. By statistically processing the stored jamming wave data, there is an effect of preventing the influence of the jamming wave by the learning prediction function for changing to another frequency in advance.

  In addition, when radio waves are emitted from a high-frequency heating device or the like, frequency fluctuations can be predicted, and even if there is no interference at the present time, there is a possibility of interference after a certain time. At this time, the influence of the interference wave can be reduced by performing communication while switching to another frequency according to the fluctuation of the interference wave.

  Furthermore, even when no interference is received, the stored interference data can be statistically processed, or the learning prediction function avoiding to another frequency, or other information obtained from outside can be used. There is an effect to prevent the influence.

The frequency setting circuit 7 has the following functions.
(A) Know the interference status at other frequencies.
(B) A frequency that is considered to have good communication quality is searched for, and sequentially transmitted to a communication partner station.
(C) As a result, when frequencies having good communication quality match each other, this frequency is stored as a frequency group that can be changed.
(D) The transmission / reception circuit 2 notifies the communication partner station of a frequency that is considered to have good communication quality.
(E) When the communication quality at the frequency currently in use is deteriorated or when deterioration of the communication quality is predicted, the frequency is changed in accordance with a mutually determined rule.
[Explanation of FIG. 2]
The operation of the communication apparatus of FIG. 1 will be described with reference to the flowchart of FIG. Perform the following procedure during the standby time of your station.

  Step ST1 is an interference wave presence investigating step for switching the frequency in order and measuring whether or not a radio signal exists at the frequency. Step ST <b> 2 is a jamming wave presence investigation data storage step for storing the jamming wave presence investigation result in the jamming wave data storage circuit 5.

  Step ST3 is an interference wave presence / absence determination step for determining whether or not a wireless signal exists in the measurement result. Step ST4 is a radio signal band examining step for investigating the band of the radio signal (whether it is a narrow band) when a radio signal exists.

  Step ST5 is a radio signal band survey data storage step for storing the band survey result in the interference wave data storage circuit 5. Step ST6 is a radio signal band threshold value determining step for determining whether or not the band is equal to or greater than a threshold value.

  Step ST7 is an SS wireless LAN signal detection step for determining whether the wireless signal is an SS wireless LAN device of the same standard. Step ST8 is an SS wireless LAN signal detection data storage step for storing SS wireless LAN signal detection data.

  Step ST9 is a radio signal band threshold determination step for determining whether or not the disturbing wave data is equal to or greater than the threshold. Step ST10 is a frequency switching step.

  According to the above measurement, if there is no interference wave, it can be determined that the frequency is a frequency at which good communication quality can be expected even if it is changed. In this case, it is not necessary to switch the frequency immediately. However, when there is an interference wave caused by the SS wireless LAN device of the same standard, the interference frequency is avoided by switching the dangerous frequency that most adversely affects the communication quality to a frequency that does not adversely affect the communication quality.

  As described above, grasp the interference state at other frequencies, search for a frequency that seems to have good communication quality, and sequentially convey it to the communication partner station. If they match, this frequency is stored as a frequency group that can be changed, and if the communication quality at the currently used frequency deteriorates or if communication quality deterioration is predicted, The frequency is changed according to a predetermined rule.

  The embodiments disclosed herein are illustrative in all respects and do not limit the scope of the claims. The technical scope of the claims is determined not by the description described in the above embodiment, but by the configuration described in the claims, and all the configurations equivalent to the configurations described in the claims. Is included in the technical scope of the claims.

  The present invention has utility with utility for each of the following embodiments, thus supporting industrial applicability. As described above, the present invention detects the presence of the interference wave in real time, changes the frequency so as to avoid the interference wave, and further predicts the interference wave that can be predicted when the frequency fluctuation of the interference wave can be predicted. By changing the frequency in advance to a frequency that can avoid the interference, it is possible to make it less susceptible to interference waves.

  In addition, as described above, the present invention grasps the presence state of the interference wave in each frequency channel in real time, so that when the communication quality is deteriorated or expected to deteriorate, By changing to a frequency that is less affected by interference, an effect of minimizing degradation of communication quality can be expected.

  Therefore, in the case of receiving interference from other radio equipment in the interference communication predicting frequency control communication system of the present invention, particularly in the case of using the wireless device using the SS wireless LAN, avoid this. A technique for ensuring stable wireless communication can be put into practical use and has great industrial applicability.

It is a block diagram of the Example of the jamming wave prediction type | formula frequency control communication apparatus of this invention. It is a flowchart which shows the operation | movement order of the block diagram of FIG. FIG. 6 is an electrical equivalent diagram of the interference-free communication method of the prior art 1. FIG. 6 is an electrical equivalent diagram of a spread spectrum communication apparatus of Prior Art 2. And FIG. 7 is an electrical equivalent diagram of a wireless communication monitoring system according to Prior Art 3.

Explanation of symbols

  1 antenna 2 transmission / reception circuit 3 modulation / demodulation circuit 4 modulation / spreading / coding processing circuit 5 interference wave data storage circuit 6 interference wave data discrimination circuit 7 frequency setting circuit / optimum frequency selection circuit 8 frequency control circuit / Optimal frequency change instruction circuit, 10 jamming wave detection circuit, 11 jamming wave presence investigation function unit / reception level detection function unit, 12 radio signal band survey function unit, 13 SS wireless LAN signal detection unit.

Claims (6)

A communication control method using SS wireless LAN communication method included in the wireless communication network by the time division multiple access communication system,
For a plurality of frequencies included in a frequency band used for communication in the wireless network of the local station, a step of determining whether or not there is a wireless signal used for other purposes than the local station for each frequency, and
A step of determining whether or not the radio signal is a narrow-band signal for a frequency determined that there is a radio signal to be used other than the local station or for other purposes;
For a frequency at which a radio signal determined not to be a narrowband signal exists, the radio signal is a signal according to the SS wireless LAN communication system of the same standard as the local station, and the level of the radio signal is a predetermined threshold. Determining whether or not the value is greater than or equal to,
Whether the wireless signal exists, whether the existing wireless signal is a narrow-band signal, and the level of the wireless signal based on the SS wireless LAN communication system of the same standard as the local station is predetermined. Determining a frequency at which the communication quality is determined to be good based on whether or not the threshold value is exceeded;
Notifying the communication destination of the local station of the frequency determined to have good communication quality, and receiving a notification of the frequency determined to be good communication quality at the communication destination from the communication destination of the local station;
When it is determined that the level of the radio signal according to the SS wireless LAN communication system of the same standard as the local station is equal to or higher than a predetermined threshold for the frequency used for communication in the wireless network of the local station, A jamming wave predictive frequency control communication method comprising: switching to a frequency that has been previously determined to be good in communication quality with a communication destination of the local station . Judge whether the radio signal used for communication other than your own station or for other purposes that exists in the frequency used for communication in your own radio network fluctuates in time, and the radio signal is temporal 2. The method according to claim 1, further comprising a step of switching to a frequency that is preliminarily determined that the communication quality is good between the local station and the communication destination of the local station even when the frequency is constantly changing. Interference wave prediction type frequency control communication method. Based on the time statistics for a plurality of frequencies included in the frequency band used for communication in the local station of the wireless network, determine whether the predetermined trend, if it is judged that there is the predetermined trend Even if it is not determined that there is a radio signal using the SS wireless LAN communication system of the same standard as the local station for the frequency used for communication in the wireless network of the local station, the communication quality is good according to the tendency. The interference wave prediction type frequency control communication method according to claim 1, further comprising a step of switching to a frequency that has been previously determined to be present . The time division multiple access communication system comprising a communication control apparatus using SS wireless LAN communication method included in the wireless communication network,
Means for determining whether or not there is a radio signal used for other purposes than the local station for each of a plurality of frequencies included in the frequency band used for communication in the wireless network of the local station;
Means for determining whether or not the radio signal is a narrow-band signal for a frequency determined that there is a radio signal used for other purposes than the own station;
For a frequency at which a radio signal determined not to be a narrowband signal exists, the radio signal is a signal according to the SS wireless LAN communication system of the same standard as the local station, and the level of the radio signal is a predetermined threshold. Means for determining whether or not the value is greater than,
Whether the wireless signal exists, whether the existing wireless signal is a narrow-band signal, and the level of the wireless signal based on the SS wireless LAN communication system of the same standard as the local station is predetermined. Means for determining a frequency at which the communication quality is judged to be good based on whether or not the threshold value is exceeded;
Means for notifying the communication destination of the own station of the frequency determined to have good communication quality, and receiving a notification of the frequency determined to be good at the communication destination from the communication destination of the own station;
When it is determined that the level of the radio signal according to the SS wireless LAN communication system of the same standard as the local station is equal to or higher than a predetermined threshold for the frequency used for communication in the wireless network of the local station, with the communication destination of the mobile station, and means for switching the frequency of the communication quality it has been previously determined to be good, communication controller. Judge whether the radio signal used for communication other than your own station or for other purposes that exists in the frequency used for communication in your own radio network fluctuates in time, and the radio signal is temporal The apparatus according to claim 4, further comprising means for switching to a frequency that is preliminarily determined that the communication quality is good between the local station and the communication destination of the local station even when the local station is fluctuating constantly. communication control device. Based on the time statistics for a plurality of frequencies included in the frequency band used for communication in the local station of the wireless network, it is determined whether the predetermined trend, if it is determined that there is the predetermined trend Even if it is not determined that there is a radio signal using the SS wireless LAN communication system of the same standard as the local station for the frequency used for communication in the wireless network of the local station, the communication quality is good according to the tendency. there further comprising a step of switching the frequency that has been previously determined, communication control device according to claim 4 or 5.

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