A wireless radio frequency channel collision avoidance method applied to a fault indicator

Abstract

The application discloses a wireless radio frequency channel conflict avoidance method applied to a fault indicator, and the method comprises the following steps: a collection unit of the fault indicator broadcasts a heartbeat frame at a random time interval T at a public frequency point; the collection unit listens to the heartbeat frame of other collection units at the public frequency point, records information in the heartbeat frame, and updates a system device information list; the ID in the device information list of the listening party and the ID in the device information list in the heartbeat frame of other collection units listened to by the listening party are consistent and have not changed; and the collection unit allocates a private frequency point and a time slot according to the ID size in the system device information list, which not only provides a special time slot for the sharing of the device information list between the collection units in the system, but also reserves a public time slot for a newly accessed device. The system is more likely to listen to the access information of the new device, thereby shortening the access time of the new device to the system.

Description

Technical Field

[0001] This invention relates to the field of power communication technology, and more specifically to a wireless radio frequency channel collision avoidance method applied to fault indicators. Background Technology

[0002] The transient waveform recording fault indicator is a device for monitoring the operating status and faults of overhead lines. When a fault occurs on the line, the fault indicator locates the fault based on changes in various electrical quantities it monitors and starts recording waveforms, uploading the fault location information and fault waveforms to the master station. The master station analyzes the information and waveforms uploaded by the fault indicator to locate the faulty section and handles the fault automatically or manually.

[0003] Existing channel collision avoidance methods sometimes involve checking channel busy before transmitting data; if busy, a random delay is added before retransmission. This method suffers from some reliability issues, particularly with large data transmission volumes, where it exhibits poor interference resistance. Another approach uses time-division multiplexing. This involves synchronizing the aggregation and acquisition units within the system, then allocating mutually exclusive time slots for each unit. Each device communicates only within its own time slot. While this method addresses the reliability issue of the previous random delay method, its communication efficiency is low, and the transmission time increases with the amount of data transmitted. Furthermore, when new devices are added to the system, the time-division scheme needs to be reconfigured, resulting in a lengthy time allocation of time slots. Summary of the Invention

[0004] This invention proposes a wireless radio frequency channel collision avoidance method for fault indicators to solve the technical problems mentioned in the background.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A wireless radio frequency channel collision avoidance method applied to a fault indicator according to the present invention includes the following steps:

[0006] A wireless radio frequency channel collision avoidance method applied to a fault indicator includes the following steps:

[0007] S1. Determine the center frequency point based on the fault indicator, use the center frequency point as the common frequency point, and select several independent communication frequency points as private frequency points;

[0008] S2. The aggregation unit of the fault indicator broadcasts a heartbeat frame at a random time interval T on the common frequency. The aggregation unit listens to the heartbeat frames of other aggregation units on the common frequency, records the information in the heartbeat frames, and updates the system device information list.

[0009] S3. The device information list of the monitoring party is consistent with the ID in the device information list of other aggregation units' heartbeat frames and has not changed. The aggregation unit allocates private frequency points and time slots according to the system device information list and sorts them by ID size in the device information list.

[0010] S4. The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency point. After receiving the heartbeat frame of the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message to it. After receiving the heartbeat confirmation frame, the acquisition unit jumps to the set private frequency point.

[0011] S5. The aggregation unit performs periodic switching between private and public frequencies;

[0012] S6. After the aggregation unit and the acquisition unit complete registration and frequency hopping, the aggregation unit performs clock synchronization with the acquisition units under its jurisdiction through a private frequency point. Then, the aggregation unit initiates data communication in sequence, and the three acquisition units actively send data.

[0013] Preferably, step S1 includes the following steps:

[0014] S11. Determine the center frequency point based on the model of the wireless radio frequency chip in the fault indicator, and use the center frequency point as the common frequency point.

[0015] S12. Select N independent communication frequency points with equal bandwidth as the center frequency point as private frequency points, numbered 1 to N, and the public frequency point numbered 0. Configure the N+1 frequency points in the fault indicator in advance.

[0016] Preferably, step S2 includes the following steps:

[0017] S21. After the fault indicator is powered on, its collection unit broadcasts a heartbeat frame on a common frequency at a random time interval T. The time interval T is a random number greater than T1 and less than T2. ​​The content of the heartbeat frame includes the collection unit ID, the collection unit system time, the collection unit private frequency number, and a list of system equipment information. The private frequency number is initially 0. The T1 time is the lower limit of the random interval time, and the T2 time is the upper limit of the random interval time. The purpose of the T1 time and the T2 time is to limit the random time T to a certain time range.

[0018] S22. The aggregation unit of each set of equipment listens to the heartbeat frames of other aggregation units on the common frequency point, records the information in the heartbeat frames, and updates the system equipment information list. The system equipment information list contains a list of all aggregation unit equipment IDs in the system and their corresponding private frequency point numbers.

[0019] S23 and T3 are one listening cycle. If the device information list of the listening party is consistent with the ID in the device information list of other aggregation unit heartbeat frames for K consecutive listening cycles and there is no change, private frequency point and time slot allocation are performed. K is the number of judgment cycles in which no new device is added to the system.

[0020] Preferably, step S3 includes the following steps:

[0021] S31. Each system equipment aggregation unit allocates private frequency points and time slots according to the system equipment information list and sorts them by the size of the aggregation unit equipment ID. The private frequency points and time slots share the same number. The aggregation unit with the smallest ID is assigned the private frequency point and time slot number as 1, which are respectively assigned to N. The private frequency point number is changed synchronously in the heartbeat frame.

[0022] S32. Using the time of the aggregation unit numbered 1 as the reference time, the aggregation unit is a time reference device. After being assigned a number, the aggregation unit continues to broadcast heartbeat frames at time intervals T. The listening period is T3. Other aggregation units synchronize their time after listening to the heartbeat frames of the time reference device and update the system device information list. The time synchronization of the aggregation unit is completed and the private frequency point number in its recorded device information list is updated.

[0023] Preferably, step S4 includes the following steps:

[0024] S41. The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency point. After receiving the heartbeat frame from the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message to it. The confirmation message includes the private frequency point number of this set of equipment.

[0025] S42. After receiving the heartbeat confirmation frame, the acquisition unit jumps to the set private frequency point to register.

[0026] Preferably, step S5 includes the following steps:

[0027] S51. The frequency switching period of the aggregation unit is time T4, which consists of three time slots: T5, T6, and T7.

[0028] S52. During the T5 time slot, each aggregation unit communicates with the acquisition unit under its jurisdiction on a private frequency.

[0029] S53. In time slot T6, the numbered aggregation units broadcast heartbeat frames in their own sub-time slots at a common frequency. In time slot T7, the numbered aggregation units do not broadcast heartbeat frames and are all in listening mode, receiving heartbeat frames broadcast by newly added devices.

[0030] S54. During time slots T6 and T7, the aggregation unit updates the system device information list based on the received heartbeat frames.

[0031] S55. If a collection unit in the device information list does not receive a heartbeat frame from the collection unit for X consecutive T4 cycles, then the device ID and other information are deleted from the device information list, and the numbering resources are released, that is, the private frequency point and sub-time slot resources in the T6 time slot occupied by the number are released, forming a numbering vacancy. The device ID in the numbering vacancy in the device information list is 0, and X is the number of judgment cycles for not receiving a heartbeat frame.

[0032] S56. When the aggregation unit detects a new aggregation unit ID that is not in the system device information list, it updates its own device information list. From this point on, if the system device information list detected for K consecutive T4 cycles is consistent with the aggregation unit ID in the recorded system device information list and has not changed, then a new device is added.

[0033] Preferably, step S6 includes the following steps:

[0034] S61. After the aggregation unit and the acquisition unit complete registration and frequency hopping, in the T5 time slot, the aggregation unit performs clock synchronization of the acquisition units under its jurisdiction through a private frequency point.

[0035] S62 and T5 time slots are divided into four time slots: t1, t2, t3, and t4. In time slot t1, the three acquisition units are in listening mode, and the aggregation unit initiates data communication in sequence. In time slots t2, t3, and t4, the three acquisition units actively send data, and the aggregation unit is in listening mode.

[0036] Preferably, the public frequency point and the private frequency point can communicate simultaneously without interfering with each other.

[0037] Preferably, T5 is a private frequency communication time slot, T6 is a public frequency communication private time slot, and T7 is a public frequency communication public time slot. The T5 and T7 time slots of each aggregation unit completely overlap, and the T6 time slot is divided into N sub-time slots, which are sequentially assigned to the existing numbered aggregation units from 1 to N.

[0038] Preferably, the aggregation unit uses a common frequency point for communication in both the T6 and T7 time slots.

[0039] As can be seen from the above technical solution, the present invention provides a wireless radio frequency channel collision avoidance method applied to fault indicators. Compared with the prior art, the present invention has the following advantages:

[0040] 1. This invention first solves the communication interference between multiple fault indicators by using communication frequency mutual exclusion; then, it solves the communication interference between the aggregation unit and the acquisition unit within each fault indicator by using time mutual exclusion. The aggregation unit and acquisition unit within multiple devices can transmit data simultaneously without interference, which greatly improves channel utilization and can adapt to communication access with larger data volumes. Fault recording is the core function of transient recording fault indicator. During fault recording, the wireless radio frequency concurrently transmits a large amount of data, which can complete data transmission quickly and well.

[0041] 2. This invention synchronizes the time between aggregation units and divides the private and public frequency slots after the initial allocation of private frequency points. This provides dedicated time slots for sharing device information lists among aggregation units within the system, and also reserves public time slots for newly accessed devices. The system can more easily detect the access information of new devices, thereby shortening the time for new devices to access the system.

[0042] 3. The access process of the new device in this invention is carried out on a common frequency point, which will not affect the normal data transmission of the original system, thus improving communication stability and having significant advantages. Attached Figure Description

[0043] Figure 1 This is a flowchart illustrating a wireless radio frequency channel collision avoidance method applied to a fault indicator according to the present invention.

[0044] Figure 2 This is a timing diagram showing the communication between the aggregation unit and the acquisition unit in this invention;

[0045] Figure 3 This is a flowchart illustrating the wireless radio frequency channel collision avoidance method of the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0047] like Figure 1 and Figure 3 As shown in this embodiment, a wireless radio frequency channel collision avoidance method applied to a fault indicator includes the following steps:

[0048] S1. Determine the center frequency point based on the fault indicator, use the center frequency point as the common frequency point, and select several independent communication frequency points as private frequency points;

[0049] Specifically, the wireless radio frequency chip in a certain fault indicator is model SX1212, with a system center frequency of 433MHz. This center frequency is used as the common frequency. Twenty independent communication frequencies with equal bandwidth intervals of 100kHz are selected as private frequencies, ensuring simultaneous communication without interference between different frequencies. These private frequencies are numbered 1-20, and the common frequency is numbered 0. In summary, this system uses a total of 21 frequencies, and the configuration of these 21 frequencies is pre-programmed into the fault indicator.

[0050] S2. The aggregation unit of the fault indicator broadcasts a heartbeat frame at a random time interval T on the common frequency. The aggregation unit listens to the heartbeat frames of other aggregation units on the common frequency, records the information in the heartbeat frames, and updates the system device information list.

[0051] Specifically, after the fault indicator is powered on, its aggregation unit broadcasts a heartbeat frame on the common frequency at random time intervals T. The time interval T is a random number greater than T1=0.2s and less than T2=2s. The heartbeat frame contains the aggregation unit's own ID, its own system time, its own private frequency number, and a list of system device information. The private frequency number is initially 0. The system device information list contains a list of device IDs of all aggregation units in the system and their corresponding private frequency numbers. Simultaneously, each set of devices' aggregation units listens to the heartbeat frames of other aggregation units on the common frequency, records the information in the heartbeat frames, and updates the system device information list. A listening cycle is 5s. If K=5 consecutive listening cycles meet the condition that the device information list of the listening device is consistent with the IDs in the device information lists of other aggregation units' heartbeat frames and has not changed, the system enters the private frequency and time slot allocation stage, proceeding to S3.

[0052] S3. The device information list of the monitoring party is consistent with the ID in the device information list of other aggregation units' heartbeat frames and has not changed. The aggregation unit allocates private frequency points and time slots according to the system device information list and sorts them by ID size in the device information list.

[0053] Specifically, the private frequency points and time slot allocation process of the aggregation unit performs the following operations:

[0054] Each set of equipment's aggregation unit allocates private frequency points and time slots according to the system equipment information list, sorted by their ID size. Private frequency points and time slots share a common number. Aggregation unit A, with the smallest ID, is assigned the private frequency point and time slot number as 1, and so on. Aggregation unit B is assigned the number 2, aggregation unit C is assigned the number 3, and the maximum number does not exceed 20. The private frequency point number changes synchronously in the heartbeat frame.

[0055] Using the time of aggregation unit A, numbered 1, as the base time, this aggregation unit is referred to as the time reference device. After being assigned a number, the aggregation unit continues to broadcast a heartbeat frame at a random time interval between 0.2s and 2s. Other aggregation units, upon hearing the heartbeat frame from the time reference device, synchronize their own time and update the system device information list. Once the aggregation unit's time synchronization is complete and the private frequency point number in its recorded device information list is updated, it enters the acquisition unit registration stage, proceeding to S4.

[0056] S4. The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency point. After receiving the heartbeat frame of the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message to it. After receiving the heartbeat confirmation frame, the acquisition unit jumps to the set private frequency point.

[0057] The specific operations during the acquisition unit registration phase are as follows: The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency 433MHz. After receiving the heartbeat frame from the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message, which contains the private frequency number of this equipment. After receiving the heartbeat confirmation frame, the acquisition unit hops to the designated private frequency. After all the acquisition units under its jurisdiction have completed registration, the aggregation unit performs periodic switching between the private and common frequencies, entering S5.

[0058] S5. The aggregation unit performs periodic switching between private and public frequencies;

[0059] Specifically, the periodic switching operation between private and public frequencies by the aggregation unit is as follows:

[0060] The frequency switching cycle of the aggregation unit is T4, lasting 3 seconds. T4 consists of three time slots: T5, T6, and T7. T5 is a private frequency communication time slot, T6 is a private communication time slot on a public frequency, and T7 is a public communication time slot on a public frequency. The durations of T5, T6, and T7 are 1.5 seconds, 1 second, and 0.5 seconds, respectively. The T5 and T7 time slots of each aggregation unit completely overlap. The T6 time slot is divided into 20 sub-time slots, which are assigned sequentially from 1 to 20 to the existing numbered aggregation units. In this example, there are 3 existing numbered aggregation units, and the sub-time slots after number 3 are idle.

[0061] Within the T5 time slot, each collection unit communicates with its managed acquisition unit on a private frequency point. The communication between the complete set of fault indicators does not interfere with each other, and the intra-set communication mechanism is as in S6.

[0062] The aggregation units communicate using a common frequency point within both time slots T6 and T7. Within time slot T6, each assigned aggregation unit sequentially broadcasts a heartbeat frame within its own sub-time slot using the common frequency point. The heartbeat frame contains the aggregation unit's own ID, system time, and private frequency point number. Within time slot T7, assigned aggregation units A, B, and C do not broadcast heartbeat frames but remain in listening mode, receiving heartbeat frames from newly added devices. Within time slots T6 and T7, the aggregation units update the system device information list based on the received heartbeat frames. When the aggregation unit ID in the device information list changes, the following operations are performed:

[0063] Specifically, the device deletion process is as follows:

[0064] For a collection unit already in the device information list, if no heartbeat frame is received for X = 3 consecutive T4 cycles (3s), the device ID and other information are deleted from the device information list, releasing the numbering resources, i.e., releasing the private frequency point and sub-time slot resources in the T6 time slot occupied by the number, forming a numbering vacancy. The device ID in the numbering vacancy in the device information list is 0, and the workflow of other devices remains unchanged. Here, X is the number of cycles for judging if no heartbeat frame is received. The count is incremented by 1 for each cycle that meets the condition, and reset to 0 for the next cycle that does not meet the condition. When the count reaches 3, it is considered that the overall condition is met.

[0065] Specifically, the equipment additions are as follows:

[0066] When a new aggregation unit ID is detected that is not in the system device information list, it updates its own device information list. From this point onward, if the system device information list detected by the aggregation unit is consistent with its own recorded system device information list for K=5 consecutive T4 cycles (3 seconds) and the aggregation unit ID remains unchanged, a new device is added. When adding a new device, the device information list is checked for available slots in ascending order of private frequency code. If a slot is available, it is assigned to the new device; otherwise, a slot is appended to the end, with a maximum appended slot of 20. The new device synchronizes its own time with the system reference time. The acquisition units in the new device complete registration according to the method described in S4. The count is incremented by 1 for each cycle that meets the conditions, and reset to 0 for the next cycle that does not meet the conditions. When the count reaches K=5, the overall conditions are considered met.

[0067] S6. After the aggregation unit and the acquisition unit complete registration and frequency hopping, the aggregation unit performs clock synchronization with the acquisition units under its jurisdiction through a private frequency point. Then, the aggregation unit initiates data communication in sequence, and the three acquisition units actively send data.

[0068] The specific operation for communication between the aggregation unit and the acquisition unit is as follows:

[0069] After the aggregation unit and the acquisition unit complete registration and frequency hopping, in the T5 time slot, the aggregation unit performs clock synchronization of the acquisition units under its jurisdiction through a private frequency point. The specific synchronization method will not be described in detail here.

[0070] After the aggregation unit and the acquisition unit complete clock synchronization, the communication mechanism between the aggregation unit and the acquisition unit is as follows: Figure 2 As shown.

[0071] The T5 time slot is divided into four time slots: t1, t2, t3, and t4, with values ​​of 0.6s, 0.3s, 0.3s, and 0.3s respectively. These time slots are used to avoid communication conflicts between the aggregation and acquisition units. During the t1 time slot, the three acquisition units are in a listening state, and the aggregation unit initiates data communication sequentially. During the t2, t3, and t4 time slots, the three acquisition units actively upload data, while the aggregation unit remains in a listening state. During the T6 and T7 time slots, the acquisition units are in a sleep state to conserve power. These three acquisition units are Acquisition Unit A, Acquisition Unit B, and Acquisition Unit C.

[0072] In summary, this invention first solves the communication interference between multiple fault indicators by using communication frequency mutual exclusion; then, it solves the communication interference between the aggregation unit and the acquisition unit within each fault indicator by using time mutual exclusion. The aggregation unit and acquisition unit within multiple devices can transmit data simultaneously without interference, greatly improving channel utilization and adapting to larger data volume communication access. Fault waveform recording is the core function of the transient waveform recording type fault indicator. During fault waveform recording, the wireless radio frequency concurrently transmits a large amount of data, which can complete data transmission quickly and efficiently.

[0073] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk), etc.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0075] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0076] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless radio frequency channel collision avoidance method applied to a fault indicator, characterized in that, Includes the following steps: S1. Determine the center frequency point based on the fault indicator, use the center frequency point as the common frequency point, and select several independent communication frequency points as private frequency points; S2. The aggregation unit of the fault indicator broadcasts a heartbeat frame at a random time interval T on the common frequency. The aggregation unit listens to the heartbeat frames of other aggregation units on the common frequency, records the information in the heartbeat frames, and updates the system device information list. S3. The device information list of the monitoring party is consistent with the ID in the device information list of other aggregation unit heartbeat frames and has not changed. The aggregation unit allocates private frequency points and time slots according to the system device information list and sorts them by ID size in the device information list. S4. The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency. After receiving the heartbeat frame from the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message to the acquisition unit. After receiving the heartbeat confirmation frame, the acquisition unit jumps to the set private frequency. S5. The aggregation unit performs periodic switching between private and public frequencies; S5 includes the following steps: S51. The frequency switching period of the aggregation unit is time T4, which consists of three time slots: T5, T6, and T7. S52. During the T5 time slot, each aggregation unit communicates with the acquisition unit under its jurisdiction on a private frequency. S53. In time slot T6, the numbered aggregation units broadcast heartbeat frames in their own sub-time slots at a common frequency. In time slot T7, the numbered aggregation units do not broadcast heartbeat frames and are all in listening mode, receiving heartbeat frames broadcast by newly added devices. S54. During time slots T6 and T7, the aggregation unit updates the system device information list based on the received heartbeat frames. S55. If a collection unit in the device information list does not receive a heartbeat frame from the collection unit for X consecutive T4 cycles, the device ID information is deleted from the device information list, and the numbering resources are released, that is, the private frequency point and sub-time slot resources in the T6 time slot occupied by the number are released, forming a numbering vacancy. The device ID in the numbering vacancy in the device information list is 0, where X is the number of judgment cycles for not receiving a heartbeat frame. S56. When the aggregation unit detects a new aggregation unit ID that is not in the system device information list, it updates its own device information list. If the system device information list detected for K consecutive T4 cycles is consistent with the aggregation unit ID in the recorded system device information list and has not changed, then the device is added. S6. The aggregation unit synchronizes the clock of the acquisition units under its jurisdiction through a private frequency point, and then the aggregation unit initiates data communication in sequence, and the acquisition units actively send data.

2. The wireless radio frequency channel collision avoidance method applied to a fault indicator according to claim 1, characterized in that: S1 includes the following steps: S11. Determine the center frequency point based on the model of the wireless radio frequency chip in the fault indicator, and use the center frequency point as the common frequency point. S12. Select N independent communication frequency points with equal bandwidth as the center frequency point as private frequency points, numbered 1 to N, and the public frequency point numbered 0. Configure the N+1 frequency points in the fault indicator in advance.

3. The wireless radio frequency channel collision avoidance method applied to a fault indicator according to claim 2, characterized in that: S2 includes the following steps: S21. After the fault indicator is powered on, its collection unit broadcasts a heartbeat frame on a common frequency at a random time interval T. The time interval T is a random number greater than T1 and less than T2. ​​The content of the heartbeat frame includes the collection unit ID, the collection unit system time, the collection unit private frequency number, and the system device information list. The private frequency number is initially 0. The T1 time is the lower limit of the random interval time, and the T2 time is the upper limit of the random interval time. S22. The aggregation unit of each set of equipment listens to the heartbeat frames of other aggregation units on the common frequency point, records the information in the heartbeat frames, and updates the system equipment information list. The system equipment information list contains a list of equipment IDs of all aggregation units in the system and their corresponding private frequency point numbers. S23 and T3 are one listening cycle. If the device information list of the listening party is consistent with the ID in the device information list of other aggregation unit heartbeat frames for K consecutive listening cycles and there is no change, private frequency point and time slot allocation are performed. K is the number of judgment cycles in which no new device is added to the system.

4. The wireless radio frequency channel collision avoidance method applied to a fault indicator according to claim 3, characterized in that: S3 includes the following steps: S31. Each system equipment aggregation unit allocates private frequency points and time slots according to the system equipment information list and sorts them by the size of the aggregation unit equipment ID. The private frequency points and time slots share the same number. The aggregation unit with the smallest ID is assigned the private frequency point and time slot number as 1, which are respectively assigned to N. The private frequency point number is changed synchronously in the heartbeat frame. S32. Using the time of the aggregation unit numbered 1 as the reference time, the aggregation unit is a time reference device. After being assigned a number, the aggregation unit continues to broadcast heartbeat frames at time intervals T. The listening period is T3. Other aggregation units synchronize their time after listening to the heartbeat frames of the time reference device and update the system device information list. The time synchronization of the aggregation unit is completed and the private frequency point number in its recorded device information list is updated.

5. A wireless radio frequency channel collision avoidance method for a fault indicator according to claim 4, characterized in that: S4 includes the following steps: S41. The acquisition unit sends a heartbeat frame to the aggregation unit on the common frequency point. After receiving the heartbeat frame from the acquisition unit under its jurisdiction, the aggregation unit sends a heartbeat confirmation message to it. The confirmation message includes the private frequency point number of this set of equipment. S42. After receiving the heartbeat confirmation frame, the acquisition unit jumps to the set private frequency point to register.

6. A wireless radio frequency channel collision avoidance method for a fault indicator according to claim 5, characterized in that: S6 includes the following steps: S61. After the aggregation unit and the acquisition unit complete registration and frequency hopping, in the T5 time slot, the aggregation unit performs clock synchronization of the acquisition units under its jurisdiction through a private frequency point. S62 and T5 time slots are divided into four time slots: t1, t2, t3, and t4. In time slot t1, the three acquisition units are in listening mode, and the aggregation unit initiates data communication in sequence. In time slots t2, t3, and t4, the three acquisition units actively send data, and the aggregation unit is in listening mode.

7. A wireless radio frequency channel collision avoidance method for a fault indicator according to claim 6, characterized in that: The public and private frequencies can communicate simultaneously without interfering with each other.

8. A wireless radio frequency channel collision avoidance method for a fault indicator according to claim 7, characterized in that: T5 is a private frequency communication time slot, T6 is a public frequency communication private time slot, and T7 is a public frequency communication public time slot. The T5 and T7 time slots of each aggregation unit overlap, and the T6 time slot is divided into N sub-time slots, which are assigned to the existing numbered aggregation units in sequence from 1 to N.

9. A wireless radio frequency channel collision avoidance method for a fault indicator according to claim 8, characterized in that: The aggregation unit uses a common frequency for communication in both time slots T6 and T7.

Images