A radio anti-interference method based on adaptive spectrum sensing

Abstract

The present invention belongs to the field of radio technology, and specifically discloses a radio anti-interference method based on adaptive spectrum sensing, the method comprising: spectrum monitoring, defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol, link quality evaluation, constructing an adaptive channel mapping and adaptive channel selection. The present invention constructs a channel sharing protocol and a radio equipment synchronization protocol, and constructs an adaptive channel mapping method to select a channel by evaluating the link quality, and determines an interference-free channel, thereby maintaining smooth radio communication; by collecting channel quality samples on the radio equipment through a filter, and estimating the signal to interference plus noise ratio based on the sample, the link quality is evaluated, which can better help select a good channel and achieve ultra-reliable and low-latency channel scheduling and link adaptation decisions.

Description

Technical Field

[0001] The present invention relates to the field of radio, and in particular to a radio anti-interference method based on adaptive spectrum sensing. Background Art

[0002] Radio interference can lead to a decrease in the quality of useful signal reception, communication interruption, or system performance degradation. There are many sources of radio interference, and a series of measures are usually required to reduce and eliminate radio interference. Changing channels is a common method of radio interference prevention. However, there may be a certain time delay in the process of changing channels, resulting in a brief interruption or unsmooth communication. If the available channels are limited, it may be difficult to find a suitable, uninterrupted channel. At the same time, due to additional delays such as imperfect estimation of the signal to interference plus noise ratio of radio equipment, delays in channel quality measurement and reporting, and base station processing time, the randomness and unpredictability of signal interference is the main challenge for low-latency communication. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a radio anti-interference method based on adaptive spectrum sensing. In view of the technical problem that there may be a certain time delay in the process of changing channels, resulting in a brief interruption or unsmooth communication, if the selectable channels are limited, it may be difficult to find a suitable, undisturbed channel. The present invention constructs a channel sharing protocol and a radio equipment synchronization protocol, and constructs an adaptive channel mapping method to select channels and determine interference-free channels by evaluating the link quality, thereby maintaining smooth radio communication; in view of the technical problem that the randomness and unpredictability of signal interference are the main challenges of low-latency communication due to additional delays such as imperfect estimation of the signal to interference plus noise ratio of radio equipment, delays in channel quality measurement and reporting, and base station processing time, the present invention collects channel quality samples on the radio equipment through a filter, and estimates the signal to interference plus noise ratio based on this, and evaluates the link quality, which can better help select good channels and achieve ultra-reliable and low-latency channel scheduling and link adaptation decisions.

[0004] The technical solution adopted by the present invention is as follows: The present invention provides a radio anti-interference method based on adaptive spectrum sensing, which specifically comprises the following steps:

[0005] Step S1: spectrum monitoring, using spectrum detection equipment and sensors to collect radio spectrum data in real time, including signal strength and spectrum range;

[0006] Step S2: defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol;

[0007] Step S3: link quality assessment;

[0008] Step S4: constructing adaptive channel mapping;

[0009] Step S5: adaptive channel selection;

[0010] Further, step S2, defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol, specifically includes the following steps:

[0011] Step S21: each radio device is regarded as a node, and the radio devices communicate with each other in a half-duplex mode. The radio devices initiate transmission by push-to-talk. The radio device that triggers a new communication session is recorded as the master, and all other radio devices are recorded as slaves and set to synchronize with the master. The slaves perform channel switching and data reception in the same way as the master.

[0012] Step S22: The radio device stores different channel mappings simultaneously, each channel mapping is indexed by a channel mapping, and the number of channels in the channel mapping is recorded as Ncd. The radio device selects the current default channel, deletes the bad channels therein, and creates an adaptive channel mapping between all nodes. The number of channels in the adaptive mapping is recorded as Nca, where Nca <Ncd;

[0013] Step S23: before establishing a communication session, each radio device continuously receives synchronization data sent from the host, synchronizes with the host and joins the established communication session, each radio device periodically performs broadband channel sensing in the entire spectrum, and for the first superframe, the host creates an adaptive channel mapping;

[0014] Step S24: After the communication session is established, once the radio device initiates transmission, the radio device is set as the master and starts to transmit synchronization data. At this time, the communication session between the master and the slave is established and organized into a repeated first superframe. The first superframe consists of multiple time slots. In each time slot, the radio communicates in a different channel.

[0015] Step S25: When performing synchronization operation, at the beginning of each first superframe, the host generates a pseudo-random Nc synchronization channel, including an Ncsd channel generated by default channel selection and an Ncsa channel generated by adaptive channel mapping, and repeatedly switches channels on the Nc synchronization channel, the number of repetitions being 2×Ncs+1, where Ncs is the number of Nc synchronization channels;

[0016] Step S26: In the control phase, the master sends the channel mapping index and the corresponding adaptive channel mapping information to the slave. Both the adaptive channel mapping and the default channel selection are used to select the channel. At the same time, the same control information is repeatedly transmitted in multiple time slots using different channels.

[0017] Step S27: In the data transmission phase, the host selects a channel only according to the adaptive frequency management and transmits data to the slave in the data time slot;

[0018] Step S28: In the feedback phase, the master switches to the receiving state and receives the link quality feedback from the synchronous slaves. In the time slot of the first superframe, each slave presents the link quality evaluation results of all channels in the current default channel selection in the form of a binary sequence;

[0019] Step S29: During the wideband channel sensing phase, all radio devices suspend channel switching operations and use wideband channel sensing to detect channels in the entire spectrum.

[0020] Furthermore, step S3, link quality assessment, specifically includes the following steps:

[0021] Step S31: partition the radio equipment, with every three radio equipment as a cell, and the distance between the radio equipment in each cell does not exceed 500 meters. The channel quality includes the receiver type, number of antennas and potential interference suppression capability of the radio equipment. The channel quality is included in the channel state information fed back to the master together with the preferred precoding matrix indicator, ranking indicator and other slave reports;

[0022] Step S32: The host uses radio resource control signaling to configure the time domain behavior of the slave's report through a channel state information report and resource setting, and the configuration operation includes setting aperiodic and periodic reports, the number of frequency subbands reported, a channel quality table for reporting, and a channel state information reference signal;

[0023] Step S33: After receiving the slave channel quality, the host collects the slave channel quality as a channel quality sample, performs channel quality measurement on the specified channel state information reference signal, and each individual measurement is filtered and the signal to interference plus noise ratio of the radio device is evaluated using a preset frequency resolution. The signal to interference plus noise ratio on each frequency subband is mapped to the modulation and coding scheme index in the corresponding channel quality that meets the following conditions, and the link quality is fed back to the host. The formula used is as follows:

[0024] ;

[0025] In the formula, is the modulation and coding scheme index, It is frequency sub-bands, is the data transfer rate, is the block error probability, is the signal-to-interference-plus-noise ratio, is the maximum block error probability;

[0026] Step S34: Set bias interference filtering, introduce time domain filtering of the channel quality collected by the radio equipment, the slave performs the required signal and interference measurements on the channel state information reference signal, and filters the instantaneous interference measurement on the frequency subband with a low-pass first-order infinite impulse response filter. The formula used is as follows:

[0027] ;

[0028] In the formula, and It is The frequency sub-band The instantaneous and filtered disturbance measurements, is the measurement interval, and They are the memory and bias of the filter respectively;

[0029] Step S35: Link quality feedback, reporting the filtered interference and the latest desired signal fading information on each frequency sub-band to the host.

[0030] Further, step S4, constructing an adaptive channel mapping, specifically includes the following steps:

[0031] Step S41: before the communication session, the host selects a channel map and infers a binary sequence S(k) based on its wideband channel perception, indicating the quality of the channels in the selected channel map;

[0032] Step S42: After the communication session is established, in each first superframe, the master obtains the result of broadband channel sensing in the previous first superframe and link quality feedback from the synchronized slave, and uses a majority voting-based procedure to derive the binary sequence S(k) of the current channel mapping;

[0033] Step S43: Classify each channel with index k in the current channel mapping. If the number of 1s in the broadband channel perception and all link quality feedback is greater than the number of 0s, the channel is determined to be a blocked channel, and the binary sequence S(k)=1; otherwise, the channel is determined to be a good channel, and the binary sequence S(k)=0;

[0034] Step S44: Preset an available threshold of good channels. If the number of good channels determined in the current channel mapping is less than the available threshold, the host selects a new channel mapping only according to the broadband channel sensing result, and the binary sequence S(k) of the new channel mapping is updated based on the broadband channel sensing.

[0035] Step S45: Send the adaptive channel map outputted including the channel mapping index and the binary sequence S(k) of the channel mapping to the slave in the control phase of the first superframe for updating.

[0036] Further, step S5, adaptive channel selection, defines the index of the adaptive channel selection method as k0, randomly generates an interleaved sequence based on the time and network address of the current radio device, and the interleaved sequence contains all channel indexes of the current channel mapping. If the binary sequence S(k0)=0 of the channel with index k0, the channel is defined as an adaptive channel, otherwise, continue to iterate and repeatedly select a new channel index k by crossing the previous channel index until a good channel is found or the number of cycles reaches a predefined threshold.

[0037] The beneficial effects achieved by the present invention using the above scheme are as follows:

[0038] (1) In view of the technical problem that there may be a certain time delay in the process of changing channels, resulting in a temporary interruption or unsmooth communication, and if the selectable channels are limited, it may be faced with the situation that a suitable and undisturbed channel cannot be found, the present invention constructs a channel sharing protocol and a radio equipment synchronization protocol, and constructs an adaptive channel mapping method to select channels by evaluating the link quality, and determine the interference-free channel, so as to maintain smooth radio communication;

[0039] (2) In view of the technical problem that the randomness and unpredictability of signal interference are the main challenges of low-latency communication due to additional delays such as imperfect signal to interference plus noise ratio estimation of radio equipment, delays in channel quality measurement and reporting, and base station processing time, the present invention collects channel quality samples on the radio equipment through a filter, estimates the signal to interference plus noise ratio based on the samples, and evaluates the link quality, which can better help select good channels and achieve ultra-reliable and low-latency channel scheduling and link adaptation decisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of the channel quality measurement in step S33 of the present invention.

[0041] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Example 1: See Figure 1 This embodiment provides a radio anti-interference method based on adaptive spectrum sensing, which specifically includes the following steps:

[0044] Step S1: spectrum monitoring, using spectrum detection equipment and sensors to collect radio spectrum data in real time, including signal strength and spectrum range;

[0045] Step S2: defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol;

[0046] Step S3: link quality assessment;

[0047] Step S4: constructing adaptive channel mapping;

[0048] Step S5: Adaptive channel selection.

[0049] Example 2: See Figure 1 This embodiment is based on the above embodiment, step S2, defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol, specifically comprising the following steps:

[0050] Step S21: each radio device is regarded as a node, and the radio devices communicate with each other in a half-duplex mode. The radio devices initiate transmission by push-to-talk. The radio device that triggers a new communication session is recorded as the master, and all other radio devices are recorded as slaves and set to synchronize with the master. The slaves perform channel switching and data reception in the same way as the master.

[0051] Step S22: The radio device stores different channel mappings simultaneously, each channel mapping is indexed by a channel mapping, and the number of channels in the channel mapping is recorded as Ncd. The radio device selects the current default channel, deletes the bad channels therein, and creates an adaptive channel mapping between all nodes. The number of channels in the adaptive mapping is recorded as Nca, where Nca <Ncd;

[0052] Step S23: before establishing a communication session, each radio device continuously receives synchronization data sent from the host, synchronizes with the host and joins the established communication session, each radio device periodically performs broadband channel sensing in the entire spectrum, and for the first superframe, the host creates an adaptive channel mapping;

[0053] Step S24: After the communication session is established, once the radio device initiates transmission, the radio device is set as the master and starts to transmit synchronization data. At this time, the communication session between the master and the slave is established and organized into a repeated first superframe. The first superframe consists of multiple time slots. In each time slot, the radio communicates in a different channel.

[0054] Step S25: When performing synchronization operation, at the beginning of each first superframe, the host generates a pseudo-random Nc synchronization channel, including an Ncsd channel generated by default channel selection and an Ncsa channel generated by adaptive channel mapping, and repeatedly switches channels on the Nc synchronization channel, the number of repetitions being 2×Ncs+1, where Ncs is the number of Nc synchronization channels;

[0055] Step S26: In the control phase, the master sends the channel mapping index and the corresponding adaptive channel mapping information to the slave. Both the adaptive channel mapping and the default channel selection are used to select the channel. At the same time, the same control information is repeatedly transmitted in multiple time slots using different channels.

[0056] Step S27: In the data transmission phase, the host selects a channel only according to the adaptive frequency management and transmits data to the slave in the data time slot;

[0057] Step S28: In the feedback phase, the master switches to the receiving state and receives the link quality feedback from the synchronous slaves. In the time slot of the first superframe, each slave presents the link quality evaluation results of all channels in the current default channel selection in the form of a binary sequence;

[0058] Step S29: During the wideband channel sensing phase, all radio devices suspend channel switching operations and use wideband channel sensing to detect channels in the entire spectrum.

[0059] Example 3: See Figure 1 This embodiment is based on the above embodiment, step S3, link quality assessment, specifically includes the following steps:

[0060] Step S31: partition the radio equipment, with every three radio equipment as a cell, and the distance between the radio equipment in each cell does not exceed 500 meters. The channel quality includes the receiver type, number of antennas and potential interference suppression capability of the radio equipment. The channel quality is included in the channel state information fed back to the master together with the preferred precoding matrix indicator, ranking indicator and other slave reports;

[0061] Step S32: The host uses radio resource control signaling to configure the time domain behavior of the slave's report through a channel state information report and resource setting, and the configuration operation includes setting aperiodic and periodic reports, the number of frequency subbands reported, a channel quality table for reporting, and a channel state information reference signal;

[0062] Step S33: After receiving the slave channel quality, the host collects the slave channel quality as a channel quality sample, performs channel quality measurement on the specified channel state information reference signal, and each individual measurement is filtered and the signal to interference plus noise ratio of the radio device is evaluated using a preset frequency resolution. The signal to interference plus noise ratio on each frequency subband is mapped to the modulation and coding scheme index in the corresponding channel quality that meets the following conditions, and the link quality is fed back to the host. The formula used is as follows:

[0063] ;

[0064] In the formula, is the modulation and coding scheme index, It is frequency sub-bands, is the data transfer rate, is the block error probability, is the signal-to-interference-plus-noise ratio, is the maximum block error probability;

[0065] Step S34: Set bias interference filtering, introduce time domain filtering of the channel quality collected by the radio equipment, the slave performs the required signal and interference measurements on the channel state information reference signal, and filters the instantaneous interference measurement on the frequency subband with a low-pass first-order infinite impulse response filter. The formula used is as follows:

[0066] ;

[0067] In the formula, and It is The frequency sub-band The instantaneous and filtered disturbance measurements, is the measurement interval, and They are the memory and bias of the filter respectively;

[0068] Step S35: Link quality feedback, reporting the filtered interference and the latest desired signal fading information on each frequency sub-band to the host.

[0069] Through the above operations, the technical problem that the randomness and unpredictability of signal interference are the main challenges of low-latency communication due to additional delays such as imperfect signal to interference and noise ratio estimation of radio equipment, channel quality measurement and reporting delays, and base station processing time is addressed. The present invention collects channel quality samples on the radio equipment through a filter, estimates the signal to interference and noise ratio based on the samples, and evaluates the link quality, which can better help select good channels and achieve ultra-reliable and low-latency channel scheduling and link adaptation decisions.

[0070] Example 4: See Figure 1 This embodiment is based on the above embodiment, step S4, constructing an adaptive channel mapping, specifically comprising the following steps:

[0071] Step S41: before the communication session, the host selects a channel map and infers a binary sequence S(k) based on its wideband channel perception, indicating the quality of the channels in the selected channel map;

[0072] Step S42: After the communication session is established, in each first superframe, the master obtains the result of broadband channel sensing in the previous first superframe and link quality feedback from the synchronized slave, and uses a majority voting-based procedure to derive the binary sequence S(k) of the current channel mapping;

[0073] Step S43: Classify each channel with index k in the current channel mapping. If the number of 1s in the broadband channel perception and all link quality feedback is greater than the number of 0s, the channel is determined to be a blocked channel, and the binary sequence S(k)=1; otherwise, the channel is determined to be a good channel, and the binary sequence S(k)=0;

[0074] Step S44: Preset an available threshold of good channels. If the number of good channels determined in the current channel mapping is less than the available threshold, the host selects a new channel mapping only according to the broadband channel sensing result, and the binary sequence S(k) of the new channel mapping is updated based on the broadband channel sensing.

[0075] Step S45: Send the adaptive channel map outputted including the channel mapping index and the binary sequence S(k) of the channel mapping to the slave in the control phase of the first superframe for updating.

[0076] Example 5: See Figure 1 This embodiment is based on the above embodiment. Step S5, adaptive channel selection, defines the index of the adaptive channel selection method as k0, randomly generates an interleaved sequence based on the time and network address of the current radio device, and the interleaved sequence contains all channel indexes of the current channel mapping. If the binary sequence S(k0) of the channel with index k0=0, the channel is defined as an adaptive channel. Otherwise, continue to iterate and repeatedly select a new channel index k by crossing the previous channel index until a good channel is found or the number of cycles reaches a predefined threshold.

[0077] Through the above operations, there may be a certain time delay in the process of changing channels, which may cause temporary interruption or unsmooth communication. If the selectable channels are limited, it may be faced with the technical problem of not being able to find a suitable and undisturbed channel. The present invention constructs a channel sharing protocol and a radio equipment synchronization protocol. By evaluating the link quality, an adaptive channel mapping method is constructed to select channels and determine interference-free channels, thereby maintaining smooth radio communications.

[0078] Embodiment 6, this embodiment is based on the above embodiment. In embodiment 3, the input of the filter is a Gaussian distribution with a unit variance of zero. If , then it corresponds to a standard exponentially weighted moving average filter for mean estimation, otherwise it can estimate the upper or lower percentiles of the input distribution, respectively.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0080] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0081] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A radio anti-interference method based on adaptive spectrum sensing, characterized in that: The specific steps include: Step S1: spectrum monitoring, using spectrum detection equipment and sensors to collect radio spectrum data in real time, including signal strength and spectrum range; Step S2: defining an adaptive channel mapping sharing protocol and a radio equipment synchronization protocol, specifically comprising the following steps: Step S21: each radio device is regarded as a node, the radio device that triggers a new communication session is recorded as the master, all other radio devices are recorded as slaves and are set to be synchronized with the master, and the slaves perform channel switching and data reception in the same way as the master; Step S22: The radio device stores different channel mappings simultaneously, each channel mapping is indexed by a channel mapping, and the number of channels in the channel mapping is recorded as Ncd. The radio device selects the current default channel, deletes the bad channels therein, and creates an adaptive channel mapping between all nodes. The number of channels in the adaptive mapping is recorded as Nca, where Nca <Ncd; Step S23: before establishing a communication session, each radio device continuously receives synchronization data sent from the host, synchronizes with the host and joins the established communication session, each radio device periodically performs broadband channel sensing in the entire spectrum, and for the first superframe, the host creates an adaptive channel mapping; Step S24: After the communication session is established, once the radio device initiates transmission, the radio device is set as the master and starts to transmit synchronization data. At this time, the communication session between the master and the slave is established and organized as a repeated first superframe; Step S25: When performing synchronization operation, at the beginning of each first superframe, the host generates a pseudo-random Nc synchronization channel, including an Ncsd channel generated by default channel selection and an Ncsa channel generated by adaptive channel mapping, and repeatedly switches channels on the Nc synchronization channel, the number of repetitions being 2×Ncs+1, where Ncs is the number of Nc synchronization channels; Step S26: In the control phase, the master sends the channel mapping index and the corresponding adaptive channel mapping information to the slave. Both the adaptive channel mapping and the default channel selection are used to select the channel. At the same time, the same control information is repeatedly transmitted in multiple time slots using different channels. Step S27: In the data transmission phase, the host selects a channel only according to the adaptive frequency management and transmits data to the slave in the data time slot; Step S28: In the feedback phase, the master switches to the receiving state and receives the link quality feedback from the synchronous slaves. In the time slot of the first superframe, each slave presents the link quality evaluation results of all channels in the current default channel selection in the form of a binary sequence; Step S29: In the wideband channel sensing stage, all radio devices suspend channel switching operations and use wideband channel sensing to detect channels in the entire spectrum; Step S3: Link quality assessment, specifically including the following steps: Step S31: partition the radio equipment, the channel quality includes the receiver type, number of antennas and potential interference suppression capability of the radio equipment, initialize the channel state information, and include the channel quality together with the preferred precoding matrix indicator, ranking indicator and other slave reports in the channel state information fed back to the master; Step S32: The host uses radio resource control signaling to configure the time domain behavior of the slave's report through a channel state information report and resource setting, and the configuration operation includes setting aperiodic and periodic reports, the number of frequency subbands reported, a channel quality table for reporting, and a channel state information reference signal; Step S33: After receiving the slave channel quality, the host collects the slave channel quality as a channel quality sample, performs channel quality measurement on the specified channel state information reference signal, each individual measurement is filtered, and the signal to interference plus noise ratio of the radio device is evaluated using a preset frequency resolution, and the signal to interference plus noise ratio on each frequency subband is mapped to the modulation and coding scheme index in the corresponding channel quality, and the link quality is fed back to the host; Step S34: setting bias interference filtering, introducing time domain filtering of the channel quality collected by the radio equipment, the slave performs the required signal and interference measurements on the channel state information reference signal, and filters the instantaneous interference measurement on the frequency subband with a low-pass first-order infinite impulse response filter; Step S35: Link quality feedback, reporting filtered interference and the latest desired signal fading information on each frequency sub-band to the host; Step S4: constructing an adaptive channel mapping, specifically comprising the following steps: Step S41: before the communication session, the host selects a channel map and infers a binary sequence S(k) based on its wideband channel perception, indicating the quality of the channels in the selected channel map; Step S42: After the communication session is established, in each first superframe, the master obtains the result of broadband channel sensing in the previous first superframe and link quality feedback from the synchronized slave, and uses a majority voting-based procedure to derive the binary sequence S(k) of the current channel mapping; Step S43: Classify each channel with index k in the current channel mapping. If the number of 1s in the broadband channel perception and all link quality feedback is greater than the number of 0s, the channel is determined to be a blocked channel, and the binary sequence S(k)=1; otherwise, the channel is determined to be a good channel, and the binary sequence S(k)=0; Step S44: Preset an available threshold of good channels. If the number of good channels determined in the current channel mapping is less than the available threshold, the host selects a new channel mapping only according to the broadband channel sensing result, and the binary sequence S(k) of the new channel mapping is updated based on the broadband channel sensing. Step S45: sending the adaptive channel map outputted including the channel map index and the binary sequence S(k) of the channel map to the slave in the control phase of the first superframe for updating; Step S5: adaptive channel selection; The step S5, adaptive channel selection, defines the index of the adaptive channel selection method as k0, randomly generates an interleaved sequence based on the time and network address of the current radio device, and the interleaved sequence contains all channel indexes of the current channel mapping. If the binary sequence S(k0) of the channel with index k0=0, the channel is defined as an adaptive channel, otherwise, continue to iterate and repeatedly select a new channel index k by crossing the previous channel index until a good channel is found or the number of cycles reaches a predefined threshold.

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